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netfilter: nf_tables: validate catch-all set elements
[linux-block.git] / net / netfilter / nf_tables_api.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
96518518 2/*
20a69341 3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518 4 *
96518518
PM		 5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
6 */
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/list.h>
11#include <linux/skbuff.h>
12#include <linux/netlink.h>
1ff75a3e 13#include <linux/vmalloc.h>
0eb71a9d 14#include <linux/rhashtable.h>
8e6cf365 15#include <linux/audit.h>
96518518
PM		 16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
3b49e2e9 19#include <net/netfilter/nf_flow_table.h>
96518518
PM		 20#include <net/netfilter/nf_tables_core.h>
21#include <net/netfilter/nf_tables.h>
c9626a2c 22#include <net/netfilter/nf_tables_offload.h>
99633ab2 23#include <net/net_namespace.h>
96518518
PM		 24#include <net/sock.h>
25
9332d27d
FW		 26#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27
0854db2a
FW		 28unsigned int nf_tables_net_id __read_mostly;
29
96518518 30static LIST_HEAD(nf_tables_expressions);
e5009240 31static LIST_HEAD(nf_tables_objects);
3b49e2e9 32static LIST_HEAD(nf_tables_flowtables);
0935d558
FW		 33static LIST_HEAD(nf_tables_destroy_list);
34static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
96518518 35
a654de8f
PNA		 36enum {
37 NFT_VALIDATE_SKIP = 0,
38 NFT_VALIDATE_NEED,
39 NFT_VALIDATE_DO,
40};
41
4d44175a
FW		 42static struct rhltable nft_objname_ht;
43
1b2470e5
FW		 44static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
47
4d44175a
FW		 48static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
51
1b2470e5
FW		 52static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
1b2470e5
FW		 58 .automatic_shrinking = true,
59};
60
4d44175a
FW		 61static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
68};
69
c520292f
RGB		 70struct nft_audit_data {
71 struct nft_table *table;
72 int entries;
73 int op;
74 struct list_head list;
75};
76
77static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
103};
104
a654de8f
PNA		 105static void nft_validate_state_update(struct net *net, u8 new_validate_state)
106{
d59d2f82 107 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 108
109 switch (nft_net->validate_state) {
a654de8f
PNA		 110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
112 break;
113 case NFT_VALIDATE_NEED:
114 break;
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
117 return;
118 }
119
0854db2a 120 nft_net->validate_state = new_validate_state;
a654de8f 121}
0935d558
FW		 122static void nf_tables_trans_destroy_work(struct work_struct *w);
123static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
a654de8f 124
7c95f6d8 125static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 126 struct net *net,
7c95f6d8
PNA		 127 const struct sk_buff *skb,
128 const struct nlmsghdr *nlh,
36596dad 129 u8 family,
7c95f6d8
PNA		 130 struct nft_table *table,
131 struct nft_chain *chain,
132 const struct nlattr * const *nla)
133{
633c9a84 134 ctx->net = net;
36596dad 135 ctx->family = family;
26b2f552 136 ctx->level = 0;
128ad332
PNA		 137 ctx->table = table;
138 ctx->chain = chain;
139 ctx->nla = nla;
140 ctx->portid = NETLINK_CB(skb).portid;
141 ctx->report = nlmsg_report(nlh);
c9626a2c 142 ctx->flags = nlh->nlmsg_flags;
128ad332 143 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 144}
145
8411b644
PNA		 146static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
147 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 148{
149 struct nft_trans *trans;
150
8411b644 151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 152 if (trans == NULL)
153 return NULL;
154
58007785 155 INIT_LIST_HEAD(&trans->list);
b380e5c7 156 trans->msg_type = msg_type;
1081d11b
PNA		 157 trans->ctx = *ctx;
158
159 return trans;
160}
161
8411b644
PNA		 162static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
164{
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
166}
167
1081d11b
PNA		 168static void nft_trans_destroy(struct nft_trans *trans)
169{
170 list_del(&trans->list);
171 kfree(trans);
172}
173
f6ac8585
PNA		 174static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
175{
0854db2a 176 struct nftables_pernet *nft_net;
f6ac8585
PNA		 177 struct net *net = ctx->net;
178 struct nft_trans *trans;
179
180 if (!nft_set_is_anonymous(set))
181 return;
182
d59d2f82 183 nft_net = nft_pernet(net);
0854db2a 184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
6a0a8d10
PNA		 185 switch (trans->msg_type) {
186 case NFT_MSG_NEWSET:
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
189 break;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
f6ac8585
PNA		 193 break;
194 }
195 }
196}
197
d54725cd
PNA		 198static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
200{
201 struct nft_hook *hook;
202 int err, j;
203
204 j = 0;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
207 if (err < 0)
208 goto err_register;
209
210 j++;
211 }
212 return 0;
213
214err_register:
215 list_for_each_entry(hook, hook_list, list) {
216 if (j-- <= 0)
217 break;
218
219 nf_unregister_net_hook(net, &hook->ops);
220 }
221 return err;
222}
223
224static void nft_netdev_unregister_hooks(struct net *net,
f9a43007
PNA		 225 struct list_head *hook_list,
226 bool release_netdev)
d54725cd 227{
f9a43007 228 struct nft_hook *hook, *next;
d54725cd 229
f9a43007 230 list_for_each_entry_safe(hook, next, hook_list, list) {
d54725cd 231 nf_unregister_net_hook(net, &hook->ops);
f9a43007
PNA		 232 if (release_netdev) {
233 list_del(&hook->list);
234 kfree_rcu(hook, rcu);
235 }
236 }
d54725cd
PNA		 237}
238
c974a3a3
PNA		 239static int nf_tables_register_hook(struct net *net,
240 const struct nft_table *table,
241 struct nft_chain *chain)
d8ee8f7c 242{
d54725cd 243 struct nft_base_chain *basechain;
a37061a6 244 const struct nf_hook_ops *ops;
ae6153b5 245
d8ee8f7c 246 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 247 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 248 return 0;
249
4e25ceb8
FW		 250 basechain = nft_base_chain(chain);
251 ops = &basechain->ops;
ae6153b5 252
4e25ceb8
FW		 253 if (basechain->type->ops_register)
254 return basechain->type->ops_register(net, ops);
255
d3519cb8 256 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
1e9451cb
FW		 257 return nft_netdev_register_hooks(net, &basechain->hook_list);
258
259 return nf_register_net_hook(net, &basechain->ops);
d8ee8f7c
PNA		 260}
261
f9a43007
PNA		 262static void __nf_tables_unregister_hook(struct net *net,
263 const struct nft_table *table,
264 struct nft_chain *chain,
265 bool release_netdev)
c5598794 266{
d54725cd 267 struct nft_base_chain *basechain;
4e25ceb8
FW		 268 const struct nf_hook_ops *ops;
269
d8ee8f7c 270 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 271 !nft_is_base_chain(chain))
d8ee8f7c 272 return;
4e25ceb8
FW		 273 basechain = nft_base_chain(chain);
274 ops = &basechain->ops;
d8ee8f7c 275
4e25ceb8
FW		 276 if (basechain->type->ops_unregister)
277 return basechain->type->ops_unregister(net, ops);
278
d3519cb8 279 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
f9a43007
PNA		 280 nft_netdev_unregister_hooks(net, &basechain->hook_list,
281 release_netdev);
1e9451cb
FW		 282 else
283 nf_unregister_net_hook(net, &basechain->ops);
c5598794
AB		 284}
285
f9a43007
PNA		 286static void nf_tables_unregister_hook(struct net *net,
287 const struct nft_table *table,
288 struct nft_chain *chain)
289{
290 return __nf_tables_unregister_hook(net, table, chain, false);
291}
292
0854db2a
FW		 293static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
294{
d59d2f82 295 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a 296
0854db2a
FW		 297 list_add_tail(&trans->list, &nft_net->commit_list);
298}
299
ee01d542
AB		 300static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
301{
302 struct nft_trans *trans;
303
304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
305 if (trans == NULL)
306 return -ENOMEM;
307
308 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 309 nft_activate_next(ctx->net, ctx->table);
ee01d542 310
0854db2a 311 nft_trans_commit_list_add_tail(ctx->net, trans);
ee01d542
AB		 312 return 0;
313}
314
315static int nft_deltable(struct nft_ctx *ctx)
316{
317 int err;
318
319 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
320 if (err < 0)
321 return err;
322
f2a6d766 323 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 324 return err;
325}
326
66293c46 327static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
ee01d542
AB		 328{
329 struct nft_trans *trans;
330
331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
332 if (trans == NULL)
66293c46 333 return ERR_PTR(-ENOMEM);
ee01d542 334
74cccc3d 335 if (msg_type == NFT_MSG_NEWCHAIN) {
664b0f8c 336 nft_activate_next(ctx->net, ctx->chain);
ee01d542 337
74cccc3d
PNA		 338 if (ctx->nla[NFTA_CHAIN_ID]) {
339 nft_trans_chain_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
341 }
342 }
343
0854db2a 344 nft_trans_commit_list_add_tail(ctx->net, trans);
66293c46 345 return trans;
ee01d542
AB		 346}
347
348static int nft_delchain(struct nft_ctx *ctx)
349{
66293c46 350 struct nft_trans *trans;
ee01d542 351
66293c46
FW		 352 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
353 if (IS_ERR(trans))
354 return PTR_ERR(trans);
ee01d542
AB		 355
356 ctx->table->use--;
664b0f8c 357 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542 358
66293c46 359 return 0;
ee01d542
AB		 360}
361
bb7b40ae
PNA		 362static void nft_rule_expr_activate(const struct nft_ctx *ctx,
363 struct nft_rule *rule)
364{
365 struct nft_expr *expr;
366
367 expr = nft_expr_first(rule);
31cc578a 368 while (nft_expr_more(rule, expr)) {
bb7b40ae
PNA		 369 if (expr->ops->activate)
370 expr->ops->activate(ctx, expr);
371
372 expr = nft_expr_next(expr);
373 }
374}
375
376static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
f6ac8585
PNA		 377 struct nft_rule *rule,
378 enum nft_trans_phase phase)
bb7b40ae
PNA		 379{
380 struct nft_expr *expr;
381
382 expr = nft_expr_first(rule);
31cc578a 383 while (nft_expr_more(rule, expr)) {
bb7b40ae 384 if (expr->ops->deactivate)
f6ac8585 385 expr->ops->deactivate(ctx, expr, phase);
bb7b40ae
PNA		 386
387 expr = nft_expr_next(expr);
388 }
389}
390
ee01d542
AB		 391static int
392nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
393{
394 /* You cannot delete the same rule twice */
889f7ee7
PNA		 395 if (nft_is_active_next(ctx->net, rule)) {
396 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 397 ctx->chain->use--;
398 return 0;
399 }
400 return -ENOENT;
401}
402
403static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
404 struct nft_rule *rule)
405{
406 struct nft_trans *trans;
407
408 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
409 if (trans == NULL)
410 return NULL;
411
1a94e38d
PNA		 412 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
413 nft_trans_rule_id(trans) =
414 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
415 }
ee01d542 416 nft_trans_rule(trans) = rule;
0854db2a 417 nft_trans_commit_list_add_tail(ctx->net, trans);
ee01d542
AB		 418
419 return trans;
420}
421
422static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
423{
63b48c73 424 struct nft_flow_rule *flow;
ee01d542
AB		 425 struct nft_trans *trans;
426 int err;
427
428 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
429 if (trans == NULL)
430 return -ENOMEM;
431
63b48c73
PNA		 432 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
433 flow = nft_flow_rule_create(ctx->net, rule);
434 if (IS_ERR(flow)) {
435 nft_trans_destroy(trans);
436 return PTR_ERR(flow);
437 }
438
439 nft_trans_flow_rule(trans) = flow;
440 }
441
ee01d542
AB		 442 err = nf_tables_delrule_deactivate(ctx, rule);
443 if (err < 0) {
444 nft_trans_destroy(trans);
445 return err;
446 }
f6ac8585 447 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
ee01d542
AB		 448
449 return 0;
450}
451
452static int nft_delrule_by_chain(struct nft_ctx *ctx)
453{
454 struct nft_rule *rule;
455 int err;
456
457 list_for_each_entry(rule, &ctx->chain->rules, list) {
23b7ca4f
PNA		 458 if (!nft_is_active_next(ctx->net, rule))
459 continue;
460
ee01d542
AB		 461 err = nft_delrule(ctx, rule);
462 if (err < 0)
463 return err;
464 }
465 return 0;
466}
467
123b9961
PNA		 468static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
469 struct nft_set *set,
470 const struct nft_set_desc *desc)
ee01d542
AB		 471{
472 struct nft_trans *trans;
473
474 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
475 if (trans == NULL)
476 return -ENOMEM;
477
123b9961 478 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
ee01d542
AB		 479 nft_trans_set_id(trans) =
480 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 481 nft_activate_next(ctx->net, set);
ee01d542
AB		 482 }
483 nft_trans_set(trans) = set;
123b9961
PNA		 484 if (desc) {
485 nft_trans_set_update(trans) = true;
486 nft_trans_set_gc_int(trans) = desc->gc_int;
487 nft_trans_set_timeout(trans) = desc->timeout;
488 }
0854db2a 489 nft_trans_commit_list_add_tail(ctx->net, trans);
ee01d542
AB		 490
491 return 0;
492}
493
123b9961
PNA		 494static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
495 struct nft_set *set)
496{
497 return __nft_trans_set_add(ctx, msg_type, set, NULL);
498}
499
cd5125d8 500static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
ee01d542
AB		 501{
502 int err;
503
504 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
505 if (err < 0)
506 return err;
507
37a9cc52 508 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 509 ctx->table->use--;
510
511 return err;
512}
513
e5009240
PNA		 514static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
515 struct nft_object *obj)
516{
517 struct nft_trans *trans;
518
519 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
520 if (trans == NULL)
521 return -ENOMEM;
522
523 if (msg_type == NFT_MSG_NEWOBJ)
524 nft_activate_next(ctx->net, obj);
525
526 nft_trans_obj(trans) = obj;
0854db2a 527 nft_trans_commit_list_add_tail(ctx->net, trans);
e5009240
PNA		 528
529 return 0;
530}
531
532static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
533{
534 int err;
535
536 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
537 if (err < 0)
538 return err;
539
540 nft_deactivate_next(ctx->net, obj);
541 ctx->table->use--;
542
543 return err;
544}
545
3b49e2e9
PNA		 546static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
547 struct nft_flowtable *flowtable)
548{
549 struct nft_trans *trans;
550
551 trans = nft_trans_alloc(ctx, msg_type,
552 sizeof(struct nft_trans_flowtable));
553 if (trans == NULL)
554 return -ENOMEM;
555
556 if (msg_type == NFT_MSG_NEWFLOWTABLE)
557 nft_activate_next(ctx->net, flowtable);
558
2c9e4559 559 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
3b49e2e9 560 nft_trans_flowtable(trans) = flowtable;
0854db2a 561 nft_trans_commit_list_add_tail(ctx->net, trans);
3b49e2e9
PNA		 562
563 return 0;
564}
565
566static int nft_delflowtable(struct nft_ctx *ctx,
567 struct nft_flowtable *flowtable)
568{
569 int err;
570
571 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
572 if (err < 0)
573 return err;
574
575 nft_deactivate_next(ctx->net, flowtable);
576 ctx->table->use--;
577
578 return err;
579}
580
34cc9e52
PNA		 581static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
582{
583 int i;
584
585 for (i = track->regs[dreg].num_reg; i > 0; i--)
586 __nft_reg_track_cancel(track, dreg - i);
587}
588
589static void __nft_reg_track_update(struct nft_regs_track *track,
590 const struct nft_expr *expr,
591 u8 dreg, u8 num_reg)
592{
593 track->regs[dreg].selector = expr;
594 track->regs[dreg].bitwise = NULL;
595 track->regs[dreg].num_reg = num_reg;
596}
597
598void nft_reg_track_update(struct nft_regs_track *track,
599 const struct nft_expr *expr, u8 dreg, u8 len)
600{
601 unsigned int regcount;
602 int i;
603
604 __nft_reg_track_clobber(track, dreg);
605
606 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
607 for (i = 0; i < regcount; i++, dreg++)
608 __nft_reg_track_update(track, expr, dreg, i);
609}
610EXPORT_SYMBOL_GPL(nft_reg_track_update);
611
612void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
613{
614 unsigned int regcount;
615 int i;
616
617 __nft_reg_track_clobber(track, dreg);
618
619 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
620 for (i = 0; i < regcount; i++, dreg++)
621 __nft_reg_track_cancel(track, dreg);
622}
623EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
624
625void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
626{
627 track->regs[dreg].selector = NULL;
628 track->regs[dreg].bitwise = NULL;
629 track->regs[dreg].num_reg = 0;
630}
631EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
632
96518518
PM		 633/*
634 * Tables
635 */
636
36596dad 637static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 638 const struct nlattr *nla,
6001a930 639 u8 family, u8 genmask, u32 nlpid)
96518518 640{
0854db2a 641 struct nftables_pernet *nft_net;
96518518
PM		 642 struct nft_table *table;
643
cac20fcd
PNA		 644 if (nla == NULL)
645 return ERR_PTR(-EINVAL);
646
d59d2f82 647 nft_net = nft_pernet(net);
0854db2a
FW		 648 list_for_each_entry_rcu(table, &nft_net->tables, list,
649 lockdep_is_held(&nft_net->commit_mutex)) {
f2a6d766 650 if (!nla_strcmp(nla, table->name) &&
98319cb9 651 table->family == family &&
6001a930
PNA		 652 nft_active_genmask(table, genmask)) {
653 if (nft_table_has_owner(table) &&
53479909 654 nlpid && table->nlpid != nlpid)
6001a930
PNA		 655 return ERR_PTR(-EPERM);
656
96518518 657 return table;
6001a930 658 }
96518518 659 }
cac20fcd
PNA		 660
661 return ERR_PTR(-ENOENT);
96518518
PM		 662}
663
3ecbfd65
HS		 664static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
665 const struct nlattr *nla,
e31f072f 666 u8 genmask, u32 nlpid)
3ecbfd65 667{
0854db2a 668 struct nftables_pernet *nft_net;
3ecbfd65
HS		 669 struct nft_table *table;
670
d59d2f82 671 nft_net = nft_pernet(net);
0854db2a 672 list_for_each_entry(table, &nft_net->tables, list) {
3ecbfd65 673 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
e31f072f
PNA		 674 nft_active_genmask(table, genmask)) {
675 if (nft_table_has_owner(table) &&
676 nlpid && table->nlpid != nlpid)
677 return ERR_PTR(-EPERM);
678
3ecbfd65 679 return table;
e31f072f 680 }
3ecbfd65 681 }
3ecbfd65
HS		 682
683 return ERR_PTR(-ENOENT);
684}
685
96518518
PM		 686static inline u64 nf_tables_alloc_handle(struct nft_table *table)
687{
688 return ++table->hgenerator;
689}
690
32537e91 691static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 692
82603549
PNA		 693static const struct nft_chain_type *
694__nft_chain_type_get(u8 family, enum nft_chain_types type)
695{
696 if (family >= NFPROTO_NUMPROTO ||
697 type >= NFT_CHAIN_T_MAX)
698 return NULL;
699
700 return chain_type[family][type];
701}
702
32537e91 703static const struct nft_chain_type *
1ea26cca 704__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c 705{
82603549 706 const struct nft_chain_type *type;
9370761c
PNA		 707 int i;
708
baae3e62 709 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
82603549
PNA		 710 type = __nft_chain_type_get(family, i);
711 if (!type)
712 continue;
713 if (!nla_strcmp(nla, type->name))
714 return type;
9370761c 715 }
baae3e62 716 return NULL;
9370761c
PNA		 717}
718
eb014de4
PNA		 719struct nft_module_request {
720 struct list_head list;
721 char module[MODULE_NAME_LEN];
722 bool done;
723};
724
452238e8 725#ifdef CONFIG_MODULES
cefa31a9
FW		 726__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
727 ...)
452238e8
FW		 728{
729 char module_name[MODULE_NAME_LEN];
0854db2a 730 struct nftables_pernet *nft_net;
eb014de4 731 struct nft_module_request *req;
452238e8
FW		 732 va_list args;
733 int ret;
734
452238e8
FW		 735 va_start(args, fmt);
736 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
737 va_end(args);
9332d27d 738 if (ret >= MODULE_NAME_LEN)
eb014de4 739 return 0;
452238e8 740
d59d2f82 741 nft_net = nft_pernet(net);
0854db2a 742 list_for_each_entry(req, &nft_net->module_list, list) {
eb014de4
PNA		 743 if (!strcmp(req->module, module_name)) {
744 if (req->done)
745 return 0;
ec7470b8 746
eb014de4
PNA		 747 /* A request to load this module already exists. */
748 return -EAGAIN;
749 }
750 }
751
752 req = kmalloc(sizeof(*req), GFP_KERNEL);
753 if (!req)
754 return -ENOMEM;
755
756 req->done = false;
8556bceb 757 strscpy(req->module, module_name, MODULE_NAME_LEN);
0854db2a 758 list_add_tail(&req->list, &nft_net->module_list);
eb014de4
PNA		 759
760 return -EAGAIN;
452238e8 761}
cefa31a9 762EXPORT_SYMBOL_GPL(nft_request_module);
452238e8
FW		 763#endif
764
f102d66b
FW		 765static void lockdep_nfnl_nft_mutex_not_held(void)
766{
767#ifdef CONFIG_PROVE_LOCKING
c0700dfa
FW		 768 if (debug_locks)
769 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
f102d66b
FW		 770#endif
771}
772
32537e91 773static const struct nft_chain_type *
452238e8
FW		 774nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
775 u8 family, bool autoload)
9370761c 776{
32537e91 777 const struct nft_chain_type *type;
9370761c 778
1ea26cca 779 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 780 if (type != NULL)
781 return type;
f102d66b
FW		 782
783 lockdep_nfnl_nft_mutex_not_held();
9370761c 784#ifdef CONFIG_MODULES
93b0806f 785 if (autoload) {
eb014de4
PNA		 786 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
787 nla_len(nla),
788 (const char *)nla_data(nla)) == -EAGAIN)
93b0806f 789 return ERR_PTR(-EAGAIN);
9370761c
PNA		 790 }
791#endif
93b0806f 792 return ERR_PTR(-ENOENT);
9370761c
PNA		 793}
794
802b8051
PNA		 795static __be16 nft_base_seq(const struct net *net)
796{
d59d2f82 797 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 798
799 return htons(nft_net->base_seq & 0xffff);
802b8051
PNA		 800}
801
96518518 802static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 803 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
804 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 805 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 806 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
7a81575b
JGG		 807 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
808 .len = NFT_USERDATA_MAXLEN }
96518518
PM		 809};
810
84d7fce6
PNA		 811static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
812 u32 portid, u32 seq, int event, u32 flags,
813 int family, const struct nft_table *table)
96518518
PM		 814{
815 struct nlmsghdr *nlh;
96518518 816
dedb67c4 817 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 818 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
819 NFNETLINK_V0, nft_base_seq(net));
820 if (!nlh)
96518518
PM		 821 goto nla_put_failure;
822
9ddf6323 823 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
179d9ba5
PNA		 824 nla_put_be32(skb, NFTA_TABLE_FLAGS,
825 htonl(table->flags & NFT_TABLE_F_MASK)) ||
3ecbfd65
HS		 826 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
827 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
828 NFTA_TABLE_PAD))
96518518 829 goto nla_put_failure;
6001a930
PNA		 830 if (nft_table_has_owner(table) &&
831 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
832 goto nla_put_failure;
96518518 833
7a81575b
JGG		 834 if (table->udata) {
835 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
836 goto nla_put_failure;
837 }
838
053c095a
JB		 839 nlmsg_end(skb, nlh);
840 return 0;
96518518
PM		 841
842nla_put_failure:
843 nlmsg_trim(skb, nlh);
844 return -1;
845}
846
67cc570e
PNA		 847struct nftnl_skb_parms {
848 bool report;
849};
850#define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
851
852static void nft_notify_enqueue(struct sk_buff *skb, bool report,
853 struct list_head *notify_list)
854{
855 NFT_CB(skb).report = report;
856 list_add_tail(&skb->list, notify_list);
857}
858
25e94a99 859static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518 860{
0854db2a 861 struct nftables_pernet *nft_net;
96518518 862 struct sk_buff *skb;
6fb721cf 863 u16 flags = 0;
96518518
PM		 864 int err;
865
128ad332
PNA		 866 if (!ctx->report &&
867 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 868 return;
96518518 869
96518518
PM		 870 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
871 if (skb == NULL)
872 goto err;
873
6fb721cf
PNA		 874 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
875 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
876
84d7fce6 877 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
6fb721cf 878 event, flags, ctx->family, ctx->table);
96518518
PM		 879 if (err < 0) {
880 kfree_skb(skb);
881 goto err;
882 }
883
d59d2f82 884 nft_net = nft_pernet(ctx->net);
0854db2a 885 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 886 return;
96518518 887err:
25e94a99 888 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 889}
890
891static int nf_tables_dump_tables(struct sk_buff *skb,
892 struct netlink_callback *cb)
893{
894 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
0854db2a 895 struct nftables_pernet *nft_net;
96518518
PM		 896 const struct nft_table *table;
897 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 898 struct net *net = sock_net(skb->sk);
96518518
PM		 899 int family = nfmsg->nfgen_family;
900
e688a7f8 901 rcu_read_lock();
d59d2f82 902 nft_net = nft_pernet(net);
34002783 903 cb->seq = READ_ONCE(nft_net->base_seq);
38e029f1 904
0854db2a 905 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 906 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 907 continue;
908
36596dad
PNA		 909 if (idx < s_idx)
910 goto cont;
911 if (idx > s_idx)
912 memset(&cb->args[1], 0,
913 sizeof(cb->args) - sizeof(cb->args[0]));
914 if (!nft_is_active(net, table))
915 continue;
916 if (nf_tables_fill_table_info(skb, net,
917 NETLINK_CB(cb->skb).portid,
918 cb->nlh->nlmsg_seq,
919 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 920 table->family, table) < 0)
36596dad
PNA		 921 goto done;
922
923 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 924cont:
36596dad 925 idx++;
96518518
PM		 926 }
927done:
e688a7f8 928 rcu_read_unlock();
96518518
PM		 929 cb->args[0] = idx;
930 return skb->len;
931}
932
d9adf22a
FW		 933static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
934 const struct nlmsghdr *nlh,
935 struct netlink_dump_control *c)
936{
937 int err;
938
939 if (!try_module_get(THIS_MODULE))
940 return -EINVAL;
941
942 rcu_read_unlock();
943 err = netlink_dump_start(nlsk, skb, nlh, c);
944 rcu_read_lock();
945 module_put(THIS_MODULE);
946
947 return err;
948}
949
950/* called with rcu_read_lock held */
797d4980
PNA		 951static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
952 const struct nlattr * const nla[])
96518518 953{
797d4980
PNA		 954 struct netlink_ext_ack *extack = info->extack;
955 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 956 u8 family = info->nfmsg->nfgen_family;
96518518 957 const struct nft_table *table;
797d4980 958 struct net *net = info->net;
96518518 959 struct sk_buff *skb2;
96518518
PM		 960 int err;
961
797d4980 962 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
96518518
PM		 963 struct netlink_dump_control c = {
964 .dump = nf_tables_dump_tables,
d9adf22a 965 .module = THIS_MODULE,
96518518 966 };
d9adf22a 967
797d4980 968 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
96518518
PM		 969 }
970
6001a930 971 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
36dd1bcc
PNA		 972 if (IS_ERR(table)) {
973 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 974 return PTR_ERR(table);
36dd1bcc 975 }
96518518 976
d9adf22a 977 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 978 if (!skb2)
979 return -ENOMEM;
980
84d7fce6 981 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
797d4980
PNA		 982 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
983 0, family, table);
96518518 984 if (err < 0)
ee921183 985 goto err_fill_table_info;
96518518 986
ee921183 987 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 988
ee921183 989err_fill_table_info:
96518518
PM		 990 kfree_skb(skb2);
991 return err;
992}
993
c9c17211 994static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 995{
996 struct nft_chain *chain;
997 u32 i = 0;
998
999 list_for_each_entry(chain, &table->chains, list) {
1000 if (!nft_is_active_next(net, chain))
1001 continue;
f323d954 1002 if (!nft_is_base_chain(chain))
10435c11
F		 1003 continue;
1004
1005 if (cnt && i++ == cnt)
1006 break;
1007
1e9451cb 1008 nf_tables_unregister_hook(net, table, chain);
10435c11
F		 1009 }
1010}
1011
c9c17211 1012static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 1013{
1014 struct nft_chain *chain;
1015 int err, i = 0;
1016
1017 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1018 if (!nft_is_active_next(net, chain))
1019 continue;
f323d954 1020 if (!nft_is_base_chain(chain))
d2012975
PNA		 1021 continue;
1022
1e9451cb 1023 err = nf_tables_register_hook(net, table, chain);
9ddf6323 1024 if (err < 0)
d54725cd 1025 goto err_register_hooks;
9ddf6323
PNA		 1026
1027 i++;
1028 }
1029 return 0;
d54725cd
PNA		 1030
1031err_register_hooks:
10435c11 1032 if (i)
c9c17211 1033 nft_table_disable(net, table, i);
9ddf6323
PNA		 1034 return err;
1035}
1036
c9c17211 1037static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 1038{
179d9ba5 1039 table->flags &= ~NFT_TABLE_F_DORMANT;
c9c17211 1040 nft_table_disable(net, table, 0);
179d9ba5 1041 table->flags |= NFT_TABLE_F_DORMANT;
9ddf6323
PNA		 1042}
1043
179d9ba5
PNA		 1044#define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1045#define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1046#define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1047#define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1048 __NFT_TABLE_F_WAS_AWAKEN)
0ce7cf41 1049
e1aaca93 1050static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 1051{
55dd6f93 1052 struct nft_trans *trans;
e1aaca93 1053 u32 flags;
179d9ba5 1054 int ret;
9ddf6323 1055
e1aaca93
PNA		 1056 if (!ctx->nla[NFTA_TABLE_FLAGS])
1057 return 0;
9ddf6323 1058
e1aaca93 1059 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
6001a930
PNA		 1060 if (flags & ~NFT_TABLE_F_MASK)
1061 return -EOPNOTSUPP;
e1aaca93 1062
63283dd2
PNA		 1063 if (flags == ctx->table->flags)
1064 return 0;
1065
9cc0001a
PNA		 1066 if ((nft_table_has_owner(ctx->table) &&
1067 !(flags & NFT_TABLE_F_OWNER)) ||
1068 (!nft_table_has_owner(ctx->table) &&
1069 flags & NFT_TABLE_F_OWNER))
1070 return -EOPNOTSUPP;
1071
55dd6f93
PNA		 1072 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1073 sizeof(struct nft_trans_table));
1074 if (trans == NULL)
1075 return -ENOMEM;
9ddf6323 1076
e1aaca93
PNA		 1077 if ((flags & NFT_TABLE_F_DORMANT) &&
1078 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
179d9ba5
PNA		 1079 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1080 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1081 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
e1aaca93
PNA		 1082 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1083 ctx->table->flags & NFT_TABLE_F_DORMANT) {
179d9ba5
PNA		 1084 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1085 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1086 ret = nf_tables_table_enable(ctx->net, ctx->table);
1087 if (ret < 0)
1088 goto err_register_hooks;
1089
1090 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1091 }
9ddf6323
PNA		 1092 }
1093
55dd6f93 1094 nft_trans_table_update(trans) = true;
0854db2a 1095 nft_trans_commit_list_add_tail(ctx->net, trans);
179d9ba5 1096
55dd6f93 1097 return 0;
179d9ba5
PNA		 1098
1099err_register_hooks:
55dd6f93 1100 nft_trans_destroy(trans);
9ddf6323
PNA		 1101 return ret;
1102}
1103
1b2470e5
FW		 1104static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1105{
1106 const char *name = data;
1107
1108 return jhash(name, strlen(name), seed);
1109}
1110
1111static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1112{
1113 const struct nft_chain *chain = data;
1114
1115 return nft_chain_hash(chain->name, 0, seed);
1116}
1117
1118static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1119 const void *ptr)
1120{
1121 const struct nft_chain *chain = ptr;
1122 const char *name = arg->key;
1123
1124 return strcmp(chain->name, name);
1125}
1126
4d44175a
FW		 1127static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1128{
1129 const struct nft_object_hash_key *k = data;
1130
1131 seed ^= hash_ptr(k->table, 32);
1132
1133 return jhash(k->name, strlen(k->name), seed);
1134}
1135
1136static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1137{
1138 const struct nft_object *obj = data;
1139
1140 return nft_objname_hash(&obj->key, 0, seed);
1141}
1142
1143static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1144 const void *ptr)
1145{
1146 const struct nft_object_hash_key *k = arg->key;
1147 const struct nft_object *obj = ptr;
1148
1149 if (obj->key.table != k->table)
1150 return -1;
1151
1152 return strcmp(obj->key.name, k->name);
1153}
1154
f1082dd3
PS		 1155static bool nft_supported_family(u8 family)
1156{
1157 return false
1158#ifdef CONFIG_NF_TABLES_INET
1159 || family == NFPROTO_INET
1160#endif
1161#ifdef CONFIG_NF_TABLES_IPV4
1162 || family == NFPROTO_IPV4
1163#endif
1164#ifdef CONFIG_NF_TABLES_ARP
1165 || family == NFPROTO_ARP
1166#endif
1167#ifdef CONFIG_NF_TABLES_NETDEV
1168 || family == NFPROTO_NETDEV
1169#endif
1170#if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1171 || family == NFPROTO_BRIDGE
1172#endif
1173#ifdef CONFIG_NF_TABLES_IPV6
1174 || family == NFPROTO_IPV6
1175#endif
1176 ;
1177}
1178
7dab8ee3
PNA		 1179static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1180 const struct nlattr * const nla[])
96518518 1181{
7dab8ee3 1182 struct nftables_pernet *nft_net = nft_pernet(info->net);
7dab8ee3
PNA		 1183 struct netlink_ext_ack *extack = info->extack;
1184 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 1185 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 1186 struct net *net = info->net;
36dd1bcc
PNA		 1187 const struct nlattr *attr;
1188 struct nft_table *table;
e1aaca93 1189 struct nft_ctx ctx;
7a81575b 1190 u32 flags = 0;
55dd6f93 1191 int err;
96518518 1192
f1082dd3
PS		 1193 if (!nft_supported_family(family))
1194 return -EOPNOTSUPP;
1195
0854db2a 1196 lockdep_assert_held(&nft_net->commit_mutex);
36dd1bcc 1197 attr = nla[NFTA_TABLE_NAME];
6001a930
PNA		 1198 table = nft_table_lookup(net, attr, family, genmask,
1199 NETLINK_CB(skb).portid);
96518518
PM		 1200 if (IS_ERR(table)) {
1201 if (PTR_ERR(table) != -ENOENT)
1202 return PTR_ERR(table);
1a28ad74 1203 } else {
7dab8ee3 1204 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 1205 NL_SET_BAD_ATTR(extack, attr);
96518518 1206 return -EEXIST;
36dd1bcc 1207 }
7dab8ee3 1208 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518 1209 return -EOPNOTSUPP;
e1aaca93 1210
7dab8ee3
PNA		 1211 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1212
e1aaca93 1213 return nf_tables_updtable(&ctx);
96518518
PM		 1214 }
1215
c5c1f975
PM		 1216 if (nla[NFTA_TABLE_FLAGS]) {
1217 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
6001a930
PNA		 1218 if (flags & ~NFT_TABLE_F_MASK)
1219 return -EOPNOTSUPP;
c5c1f975
PM		 1220 }
1221
ffdb210e 1222 err = -ENOMEM;
33758c89 1223 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
ffdb210e 1224 if (table == NULL)
98319cb9 1225 goto err_kzalloc;
96518518 1226
33758c89 1227 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
e46abbcc 1228 if (table->name == NULL)
98319cb9 1229 goto err_strdup;
e46abbcc 1230
7a81575b 1231 if (nla[NFTA_TABLE_USERDATA]) {
33758c89 1232 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
7a81575b
JGG		 1233 if (table->udata == NULL)
1234 goto err_table_udata;
1235
85db827a 1236 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
7a81575b
JGG		 1237 }
1238
1b2470e5
FW		 1239 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1240 if (err)
1241 goto err_chain_ht;
1242
96518518 1243 INIT_LIST_HEAD(&table->chains);
20a69341 1244 INIT_LIST_HEAD(&table->sets);
e5009240 1245 INIT_LIST_HEAD(&table->objects);
3b49e2e9 1246 INIT_LIST_HEAD(&table->flowtables);
98319cb9 1247 table->family = family;
c5c1f975 1248 table->flags = flags;
ab482c6b 1249 table->handle = ++nft_net->table_handle;
6001a930
PNA		 1250 if (table->flags & NFT_TABLE_F_OWNER)
1251 table->nlpid = NETLINK_CB(skb).portid;
9ddf6323 1252
7dab8ee3 1253 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
55dd6f93 1254 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 1255 if (err < 0)
98319cb9 1256 goto err_trans;
ffdb210e 1257
0854db2a 1258 list_add_tail_rcu(&table->list, &nft_net->tables);
96518518 1259 return 0;
98319cb9 1260err_trans:
1b2470e5
FW		 1261 rhltable_destroy(&table->chains_ht);
1262err_chain_ht:
7a81575b
JGG		 1263 kfree(table->udata);
1264err_table_udata:
e46abbcc 1265 kfree(table->name);
98319cb9 1266err_strdup:
ffdb210e 1267 kfree(table);
98319cb9 1268err_kzalloc:
ffdb210e 1269 return err;
96518518
PM		 1270}
1271
b9ac12ef
AB		 1272static int nft_flush_table(struct nft_ctx *ctx)
1273{
3b49e2e9 1274 struct nft_flowtable *flowtable, *nft;
b9ac12ef 1275 struct nft_chain *chain, *nc;
e5009240 1276 struct nft_object *obj, *ne;
b9ac12ef 1277 struct nft_set *set, *ns;
3b49e2e9 1278 int err;
b9ac12ef 1279
a2f18db0 1280 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 1281 if (!nft_is_active_next(ctx->net, chain))
1282 continue;
1283
d0e2c7de
PNA		 1284 if (nft_chain_is_bound(chain))
1285 continue;
1286
b9ac12ef
AB		 1287 ctx->chain = chain;
1288
1289 err = nft_delrule_by_chain(ctx);
1290 if (err < 0)
1291 goto out;
b9ac12ef
AB		 1292 }
1293
1294 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 1295 if (!nft_is_active_next(ctx->net, set))
1296 continue;
1297
408070d6 1298 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 1299 !list_empty(&set->bindings))
1300 continue;
1301
1302 err = nft_delset(ctx, set);
1303 if (err < 0)
1304 goto out;
1305 }
1306
3b49e2e9 1307 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
335178d5
FW		 1308 if (!nft_is_active_next(ctx->net, flowtable))
1309 continue;
1310
3b49e2e9
PNA		 1311 err = nft_delflowtable(ctx, flowtable);
1312 if (err < 0)
1313 goto out;
1314 }
1315
e5009240 1316 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
335178d5
FW		 1317 if (!nft_is_active_next(ctx->net, obj))
1318 continue;
1319
e5009240
PNA		 1320 err = nft_delobj(ctx, obj);
1321 if (err < 0)
1322 goto out;
1323 }
1324
a2f18db0 1325 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 1326 if (!nft_is_active_next(ctx->net, chain))
1327 continue;
1328
d0e2c7de
PNA		 1329 if (nft_chain_is_bound(chain))
1330 continue;
1331
a2f18db0
PNA		 1332 ctx->chain = chain;
1333
1334 err = nft_delchain(ctx);
1335 if (err < 0)
1336 goto out;
1337 }
1338
b9ac12ef
AB		 1339 err = nft_deltable(ctx);
1340out:
1341 return err;
1342}
1343
1344static int nft_flush(struct nft_ctx *ctx, int family)
1345{
d59d2f82 1346 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
b9ac12ef 1347 const struct nlattr * const *nla = ctx->nla;
d59d2f82 1348 struct nft_table *table, *nt;
b9ac12ef
AB		 1349 int err = 0;
1350
0854db2a 1351 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
98319cb9 1352 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 1353 continue;
1354
98319cb9 1355 ctx->family = table->family;
f2a6d766 1356
36596dad
PNA		 1357 if (!nft_is_active_next(ctx->net, table))
1358 continue;
b9ac12ef 1359
6001a930
PNA		 1360 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1361 continue;
1362
36596dad
PNA		 1363 if (nla[NFTA_TABLE_NAME] &&
1364 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1365 continue;
b9ac12ef 1366
36596dad
PNA		 1367 ctx->table = table;
1368
1369 err = nft_flush_table(ctx);
1370 if (err < 0)
1371 goto out;
b9ac12ef
AB		 1372 }
1373out:
1374 return err;
1375}
1376
7dab8ee3
PNA		 1377static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1378 const struct nlattr * const nla[])
96518518 1379{
7dab8ee3
PNA		 1380 struct netlink_ext_ack *extack = info->extack;
1381 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 1382 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 1383 struct net *net = info->net;
36dd1bcc
PNA		 1384 const struct nlattr *attr;
1385 struct nft_table *table;
55dd6f93 1386 struct nft_ctx ctx;
96518518 1387
7dab8ee3 1388 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 1389 if (family == AF_UNSPEC ||
1390 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 1391 return nft_flush(&ctx, family);
1392
36dd1bcc
PNA		 1393 if (nla[NFTA_TABLE_HANDLE]) {
1394 attr = nla[NFTA_TABLE_HANDLE];
e31f072f
PNA		 1395 table = nft_table_lookup_byhandle(net, attr, genmask,
1396 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 1397 } else {
1398 attr = nla[NFTA_TABLE_NAME];
6001a930
PNA		 1399 table = nft_table_lookup(net, attr, family, genmask,
1400 NETLINK_CB(skb).portid);
36dd1bcc 1401 }
3ecbfd65 1402
36dd1bcc 1403 if (IS_ERR(table)) {
f80a612d
FFM		 1404 if (PTR_ERR(table) == -ENOENT &&
1405 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1406 return 0;
1407
36dd1bcc 1408 NL_SET_BAD_ATTR(extack, attr);
96518518 1409 return PTR_ERR(table);
36dd1bcc 1410 }
96518518 1411
7dab8ee3 1412 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
a8278400
PNA		 1413 table->use > 0)
1414 return -EBUSY;
1415
98319cb9 1416 ctx.family = family;
b9ac12ef 1417 ctx.table = table;
55dd6f93 1418
b9ac12ef 1419 return nft_flush_table(&ctx);
96518518
PM		 1420}
1421
55dd6f93
PNA		 1422static void nf_tables_table_destroy(struct nft_ctx *ctx)
1423{
fa5950e4
FW		 1424 if (WARN_ON(ctx->table->use > 0))
1425 return;
4fefee57 1426
1b2470e5 1427 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1428 kfree(ctx->table->name);
bc7a7082 1429 kfree(ctx->table->udata);
55dd6f93 1430 kfree(ctx->table);
55dd6f93
PNA		 1431}
1432
cc07eeb0 1433void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1434{
96518518 1435 nfnl_lock(NFNL_SUBSYS_NFTABLES);
82603549 1436 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
cc07eeb0
PNA		 1437 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1438 return;
96518518 1439 }
9370761c 1440 chain_type[ctype->family][ctype->type] = ctype;
96518518 1441 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1442}
9370761c 1443EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1444
32537e91 1445void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1446{
96518518 1447 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1448 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1449 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1450}
9370761c 1451EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1452
1453/*
1454 * Chains
1455 */
1456
1457static struct nft_chain *
cac20fcd 1458nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1459{
1460 struct nft_chain *chain;
1461
1462 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1463 if (chain->handle == handle &&
1464 nft_active_genmask(chain, genmask))
96518518
PM		 1465 return chain;
1466 }
1467
1468 return ERR_PTR(-ENOENT);
1469}
1470
4d44175a 1471static bool lockdep_commit_lock_is_held(const struct net *net)
f102d66b
FW		 1472{
1473#ifdef CONFIG_PROVE_LOCKING
d59d2f82 1474 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 1475
1476 return lockdep_is_held(&nft_net->commit_mutex);
f102d66b
FW		 1477#else
1478 return true;
1479#endif
1480}
1481
1482static struct nft_chain *nft_chain_lookup(struct net *net,
1483 struct nft_table *table,
cac20fcd 1484 const struct nlattr *nla, u8 genmask)
96518518 1485{
1b2470e5
FW		 1486 char search[NFT_CHAIN_MAXNAMELEN + 1];
1487 struct rhlist_head *tmp, *list;
96518518
PM		 1488 struct nft_chain *chain;
1489
1490 if (nla == NULL)
1491 return ERR_PTR(-EINVAL);
1492
872f6903 1493 nla_strscpy(search, nla, sizeof(search));
96518518 1494
1b2470e5 1495 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1496 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1497
1498 chain = ERR_PTR(-ENOENT);
1499 rcu_read_lock();
1500 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1501 if (!list)
1502 goto out_unlock;
1503
1504 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1505 if (nft_active_genmask(chain, genmask))
1506 goto out_unlock;
1507 }
1508 chain = ERR_PTR(-ENOENT);
1509out_unlock:
1510 rcu_read_unlock();
1511 return chain;
96518518
PM		 1512}
1513
1514static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1515 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1516 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1517 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1518 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1519 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1520 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1521 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
9332d27d
FW		 1522 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1523 .len = NFT_MODULE_AUTOLOAD_LIMIT },
0ca743a5 1524 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
c9626a2c 1525 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
74cccc3d 1526 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
002f2176
JGG		 1527 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1528 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1529};
1530
1531static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1532 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1533 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1534 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1535 .len = IFNAMSIZ - 1 },
96518518
PM		 1536};
1537
0ca743a5
PNA		 1538static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1539{
1540 struct nft_stats *cpu_stats, total;
1541 struct nlattr *nest;
ce355e20
ED		 1542 unsigned int seq;
1543 u64 pkts, bytes;
0ca743a5
PNA		 1544 int cpu;
1545
edbd82c5
FW		 1546 if (!stats)
1547 return 0;
1548
0ca743a5
PNA		 1549 memset(&total, 0, sizeof(total));
1550 for_each_possible_cpu(cpu) {
1551 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20 1552 do {
d120d1a6 1553 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
ce355e20
ED		 1554 pkts = cpu_stats->pkts;
1555 bytes = cpu_stats->bytes;
d120d1a6 1556 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
ce355e20
ED		 1557 total.pkts += pkts;
1558 total.bytes += bytes;
0ca743a5 1559 }
ae0be8de 1560 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
0ca743a5
PNA		 1561 if (nest == NULL)
1562 goto nla_put_failure;
1563
b46f6ded
ND		 1564 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1565 NFTA_COUNTER_PAD) ||
1566 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1567 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1568 goto nla_put_failure;
1569
1570 nla_nest_end(skb, nest);
1571 return 0;
1572
1573nla_put_failure:
1574 return -ENOSPC;
1575}
1576
d54725cd
PNA		 1577static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1578 const struct nft_base_chain *basechain)
1579{
1580 const struct nf_hook_ops *ops = &basechain->ops;
1581 struct nft_hook *hook, *first = NULL;
1582 struct nlattr *nest, *nest_devs;
1583 int n = 0;
1584
1585 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1586 if (nest == NULL)
1587 goto nla_put_failure;
1588 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1589 goto nla_put_failure;
1590 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1591 goto nla_put_failure;
1592
d3519cb8 1593 if (nft_base_chain_netdev(family, ops->hooknum)) {
d54725cd
PNA		 1594 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1595 list_for_each_entry(hook, &basechain->hook_list, list) {
1596 if (!first)
1597 first = hook;
1598
1599 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1600 hook->ops.dev->name))
1601 goto nla_put_failure;
1602 n++;
1603 }
1604 nla_nest_end(skb, nest_devs);
1605
1606 if (n == 1 &&
1607 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1608 goto nla_put_failure;
1609 }
1610 nla_nest_end(skb, nest);
1611
1612 return 0;
1613nla_put_failure:
1614 return -1;
1615}
1616
84d7fce6
PNA		 1617static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1618 u32 portid, u32 seq, int event, u32 flags,
1619 int family, const struct nft_table *table,
96518518
PM		 1620 const struct nft_chain *chain)
1621{
1622 struct nlmsghdr *nlh;
96518518 1623
dedb67c4 1624 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 1625 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1626 NFNETLINK_V0, nft_base_seq(net));
1627 if (!nlh)
96518518
PM		 1628 goto nla_put_failure;
1629
96518518
PM		 1630 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1631 goto nla_put_failure;
b46f6ded
ND		 1632 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1633 NFTA_CHAIN_PAD))
96518518
PM		 1634 goto nla_put_failure;
1635 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1636 goto nla_put_failure;
1637
f323d954 1638 if (nft_is_base_chain(chain)) {
0ca743a5 1639 const struct nft_base_chain *basechain = nft_base_chain(chain);
edbd82c5 1640 struct nft_stats __percpu *stats;
0ca743a5 1641
d54725cd 1642 if (nft_dump_basechain_hook(skb, family, basechain))
2cbce139 1643 goto nla_put_failure;
9370761c 1644
0ca743a5
PNA		 1645 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1646 htonl(basechain->policy)))
1647 goto nla_put_failure;
1648
baae3e62
PM		 1649 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1650 goto nla_put_failure;
0ca743a5 1651
edbd82c5
FW		 1652 stats = rcu_dereference_check(basechain->stats,
1653 lockdep_commit_lock_is_held(net));
1654 if (nft_dump_stats(skb, stats))
0ca743a5 1655 goto nla_put_failure;
96518518
PM		 1656 }
1657
d0e2c7de
PNA		 1658 if (chain->flags &&
1659 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1660 goto nla_put_failure;
1661
0ca743a5
PNA		 1662 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1663 goto nla_put_failure;
1664
002f2176
JGG		 1665 if (chain->udata &&
1666 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1667 goto nla_put_failure;
1668
053c095a
JB		 1669 nlmsg_end(skb, nlh);
1670 return 0;
96518518
PM		 1671
1672nla_put_failure:
1673 nlmsg_trim(skb, nlh);
1674 return -1;
1675}
1676
25e94a99 1677static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518 1678{
0854db2a 1679 struct nftables_pernet *nft_net;
96518518 1680 struct sk_buff *skb;
6fb721cf 1681 u16 flags = 0;
96518518
PM		 1682 int err;
1683
128ad332
PNA		 1684 if (!ctx->report &&
1685 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1686 return;
96518518 1687
96518518
PM		 1688 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1689 if (skb == NULL)
1690 goto err;
1691
6fb721cf
PNA		 1692 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1693 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1694
84d7fce6 1695 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
6fb721cf 1696 event, flags, ctx->family, ctx->table,
35151d84 1697 ctx->chain);
96518518
PM		 1698 if (err < 0) {
1699 kfree_skb(skb);
1700 goto err;
1701 }
1702
d59d2f82 1703 nft_net = nft_pernet(ctx->net);
0854db2a 1704 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 1705 return;
96518518 1706err:
25e94a99 1707 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1708}
1709
1710static int nf_tables_dump_chains(struct sk_buff *skb,
1711 struct netlink_callback *cb)
1712{
1713 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518 1714 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1715 struct net *net = sock_net(skb->sk);
96518518 1716 int family = nfmsg->nfgen_family;
0854db2a 1717 struct nftables_pernet *nft_net;
d59d2f82
PNA		 1718 const struct nft_table *table;
1719 const struct nft_chain *chain;
96518518 1720
e688a7f8 1721 rcu_read_lock();
d59d2f82 1722 nft_net = nft_pernet(net);
34002783 1723 cb->seq = READ_ONCE(nft_net->base_seq);
38e029f1 1724
0854db2a 1725 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 1726 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1727 continue;
1728
36596dad
PNA		 1729 list_for_each_entry_rcu(chain, &table->chains, list) {
1730 if (idx < s_idx)
1731 goto cont;
1732 if (idx > s_idx)
1733 memset(&cb->args[1], 0,
1734 sizeof(cb->args) - sizeof(cb->args[0]));
1735 if (!nft_is_active(net, chain))
1736 continue;
1737 if (nf_tables_fill_chain_info(skb, net,
1738 NETLINK_CB(cb->skb).portid,
1739 cb->nlh->nlmsg_seq,
1740 NFT_MSG_NEWCHAIN,
1741 NLM_F_MULTI,
98319cb9 1742 table->family, table,
36596dad
PNA		 1743 chain) < 0)
1744 goto done;
38e029f1 1745
36596dad 1746 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1747cont:
36596dad 1748 idx++;
96518518
PM		 1749 }
1750 }
1751done:
e688a7f8 1752 rcu_read_unlock();
96518518
PM		 1753 cb->args[0] = idx;
1754 return skb->len;
1755}
1756
d9adf22a 1757/* called with rcu_read_lock held */
797d4980
PNA		 1758static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1759 const struct nlattr * const nla[])
96518518 1760{
797d4980
PNA		 1761 struct netlink_ext_ack *extack = info->extack;
1762 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 1763 u8 family = info->nfmsg->nfgen_family;
96518518 1764 const struct nft_chain *chain;
797d4980 1765 struct net *net = info->net;
1b2470e5 1766 struct nft_table *table;
96518518 1767 struct sk_buff *skb2;
96518518
PM		 1768 int err;
1769
797d4980 1770 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
96518518
PM		 1771 struct netlink_dump_control c = {
1772 .dump = nf_tables_dump_chains,
d9adf22a 1773 .module = THIS_MODULE,
96518518 1774 };
d9adf22a 1775
797d4980 1776 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
96518518
PM		 1777 }
1778
6001a930 1779 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
36dd1bcc
PNA		 1780 if (IS_ERR(table)) {
1781 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1782 return PTR_ERR(table);
36dd1bcc 1783 }
96518518 1784
f102d66b 1785 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1786 if (IS_ERR(chain)) {
1787 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1788 return PTR_ERR(chain);
36dd1bcc 1789 }
96518518 1790
d9adf22a 1791 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1792 if (!skb2)
1793 return -ENOMEM;
1794
84d7fce6 1795 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
797d4980
PNA		 1796 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1797 0, family, table, chain);
96518518 1798 if (err < 0)
ee921183 1799 goto err_fill_chain_info;
96518518 1800
ee921183 1801 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 1802
ee921183 1803err_fill_chain_info:
96518518
PM		 1804 kfree_skb(skb2);
1805 return err;
1806}
1807
0ca743a5
PNA		 1808static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1809 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1810 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1811};
1812
ff3cd7b3 1813static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1814{
1815 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1816 struct nft_stats __percpu *newstats;
1817 struct nft_stats *stats;
1818 int err;
1819
8cb08174
JB		 1820 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1821 nft_counter_policy, NULL);
0ca743a5 1822 if (err < 0)
ff3cd7b3 1823 return ERR_PTR(err);
0ca743a5
PNA		 1824
1825 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1826 return ERR_PTR(-EINVAL);
0ca743a5 1827
ce355e20 1828 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1829 if (newstats == NULL)
ff3cd7b3 1830 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1831
1832 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1833 * are not exposed to userspace.
1834 */
e8781f70 1835 preempt_disable();
0ca743a5
PNA		 1836 stats = this_cpu_ptr(newstats);
1837 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1838 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1839 preempt_enable();
0ca743a5 1840
ff3cd7b3
PNA		 1841 return newstats;
1842}
1843
53315ac6 1844static void nft_chain_stats_replace(struct nft_trans *trans)
ff3cd7b3 1845{
53315ac6 1846 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
0befd061 1847
53315ac6 1848 if (!nft_trans_chain_stats(trans))
b88825de
PNA		 1849 return;
1850
b685b534
PM		 1851 nft_trans_chain_stats(trans) =
1852 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1853 lockdep_commit_lock_is_held(trans->ctx.net));
53315ac6
FW		 1854
1855 if (!nft_trans_chain_stats(trans))
bbb8c61f 1856 static_branch_inc(&nft_counters_enabled);
0ca743a5
PNA		 1857}
1858
0cbc06b3
FW		 1859static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1860{
2c865a8a
PNA		 1861 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1862 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
0cbc06b3
FW		 1863
1864 if (g0 != g1)
1865 kvfree(g1);
1866 kvfree(g0);
1867
1868 /* should be NULL either via abort or via successful commit */
2c865a8a
PNA		 1869 WARN_ON_ONCE(chain->blob_next);
1870 kvfree(chain->blob_next);
0cbc06b3
FW		 1871}
1872
d0e2c7de 1873void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1874{
43a605f2 1875 struct nft_chain *chain = ctx->chain;
d54725cd 1876 struct nft_hook *hook, *next;
43a605f2 1877
fa5950e4
FW		 1878 if (WARN_ON(chain->use > 0))
1879 return;
91c7b38d 1880
0cbc06b3
FW		 1881 /* no concurrent access possible anymore */
1882 nf_tables_chain_free_chain_rules(chain);
1883
f323d954 1884 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1885 struct nft_base_chain *basechain = nft_base_chain(chain);
1886
d3519cb8 1887 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
d54725cd
PNA		 1888 list_for_each_entry_safe(hook, next,
1889 &basechain->hook_list, list) {
1890 list_del_rcu(&hook->list);
1891 kfree_rcu(hook, rcu);
1892 }
1893 }
2cbce139 1894 module_put(basechain->type->owner);
4c05ec47 1895 if (rcu_access_pointer(basechain->stats)) {
9f08ea84 1896 static_branch_dec(&nft_counters_enabled);
4c05ec47
TY		 1897 free_percpu(rcu_dereference_raw(basechain->stats));
1898 }
b7263e07 1899 kfree(chain->name);
002f2176 1900 kfree(chain->udata);
2cbce139 1901 kfree(basechain);
91c7b38d 1902 } else {
b7263e07 1903 kfree(chain->name);
002f2176 1904 kfree(chain->udata);
91c7b38d
PNA		 1905 kfree(chain);
1906 }
1907}
1908
3f0465a9
PNA		 1909static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1910 const struct nlattr *attr)
1911{
1912 struct net_device *dev;
1913 char ifname[IFNAMSIZ];
1914 struct nft_hook *hook;
1915 int err;
1916
33758c89 1917 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
3f0465a9
PNA		 1918 if (!hook) {
1919 err = -ENOMEM;
1920 goto err_hook_alloc;
1921 }
1922
872f6903 1923 nla_strscpy(ifname, attr, IFNAMSIZ);
42f1c271
PNA		 1924 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1925 * indirectly serializing all the other holders of the commit_mutex with
1926 * the rtnl_mutex.
1927 */
3f0465a9
PNA		 1928 dev = __dev_get_by_name(net, ifname);
1929 if (!dev) {
1930 err = -ENOENT;
1931 goto err_hook_dev;
1932 }
1933 hook->ops.dev = dev;
1934
1935 return hook;
1936
1937err_hook_dev:
1938 kfree(hook);
1939err_hook_alloc:
1940 return ERR_PTR(err);
1941}
1942
abadb2f8
PNA		 1943static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1944 const struct nft_hook *this)
b75a3e83
PNA		 1945{
1946 struct nft_hook *hook;
1947
1948 list_for_each_entry(hook, hook_list, list) {
1949 if (this->ops.dev == hook->ops.dev)
abadb2f8 1950 return hook;
b75a3e83
PNA		 1951 }
1952
abadb2f8 1953 return NULL;
b75a3e83
PNA		 1954}
1955
3f0465a9
PNA		 1956static int nf_tables_parse_netdev_hooks(struct net *net,
1957 const struct nlattr *attr,
1958 struct list_head *hook_list)
1959{
1960 struct nft_hook *hook, *next;
1961 const struct nlattr *tmp;
1962 int rem, n = 0, err;
1963
1964 nla_for_each_nested(tmp, attr, rem) {
1965 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1966 err = -EINVAL;
1967 goto err_hook;
1968 }
1969
1970 hook = nft_netdev_hook_alloc(net, tmp);
1971 if (IS_ERR(hook)) {
1972 err = PTR_ERR(hook);
1973 goto err_hook;
1974 }
b75a3e83 1975 if (nft_hook_list_find(hook_list, hook)) {
cd77e75b 1976 kfree(hook);
b75a3e83
PNA		 1977 err = -EEXIST;
1978 goto err_hook;
1979 }
3f0465a9
PNA		 1980 list_add_tail(&hook->list, hook_list);
1981 n++;
1982
cb662ac6 1983 if (n == NFT_NETDEVICE_MAX) {
3f0465a9
PNA		 1984 err = -EFBIG;
1985 goto err_hook;
1986 }
1987 }
3f0465a9
PNA		 1988
1989 return 0;
1990
1991err_hook:
1992 list_for_each_entry_safe(hook, next, hook_list, list) {
1993 list_del(&hook->list);
1994 kfree(hook);
1995 }
1996 return err;
1997}
1998
508f8ccd
PNA		 1999struct nft_chain_hook {
2000 u32 num;
84ba7dd7 2001 s32 priority;
32537e91 2002 const struct nft_chain_type *type;
d54725cd 2003 struct list_head list;
508f8ccd
PNA		 2004};
2005
d54725cd
PNA		 2006static int nft_chain_parse_netdev(struct net *net,
2007 struct nlattr *tb[],
2008 struct list_head *hook_list)
2009{
2010 struct nft_hook *hook;
2011 int err;
2012
2013 if (tb[NFTA_HOOK_DEV]) {
2014 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2015 if (IS_ERR(hook))
2016 return PTR_ERR(hook);
2017
2018 list_add_tail(&hook->list, hook_list);
2019 } else if (tb[NFTA_HOOK_DEVS]) {
2020 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2021 hook_list);
2022 if (err < 0)
2023 return err;
05abe445
PNA		 2024
2025 if (list_empty(hook_list))
2026 return -EINVAL;
d54725cd
PNA		 2027 } else {
2028 return -EINVAL;
2029 }
2030
2031 return 0;
2032}
2033
508f8ccd
PNA		 2034static int nft_chain_parse_hook(struct net *net,
2035 const struct nlattr * const nla[],
36596dad 2036 struct nft_chain_hook *hook, u8 family,
983c4fcb 2037 struct netlink_ext_ack *extack, bool autoload)
508f8ccd 2038{
d59d2f82 2039 struct nftables_pernet *nft_net = nft_pernet(net);
508f8ccd 2040 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 2041 const struct nft_chain_type *type;
508f8ccd
PNA		 2042 int err;
2043
0854db2a 2044 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b
FW		 2045 lockdep_nfnl_nft_mutex_not_held();
2046
8cb08174
JB		 2047 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2048 nla[NFTA_CHAIN_HOOK],
2049 nft_hook_policy, NULL);
508f8ccd
PNA		 2050 if (err < 0)
2051 return err;
2052
2053 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2054 ha[NFTA_HOOK_PRIORITY] == NULL)
2055 return -EINVAL;
2056
2057 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 2058 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2059
82603549
PNA		 2060 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2061 if (!type)
2062 return -EOPNOTSUPP;
2063
508f8ccd 2064 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 2065 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 2066 family, autoload);
983c4fcb
PNA		 2067 if (IS_ERR(type)) {
2068 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
508f8ccd 2069 return PTR_ERR(type);
983c4fcb 2070 }
508f8ccd 2071 }
d25e2e93 2072 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
508f8ccd 2073 return -EOPNOTSUPP;
84ba7dd7
FW		 2074
2075 if (type->type == NFT_CHAIN_T_NAT &&
2076 hook->priority <= NF_IP_PRI_CONNTRACK)
2077 return -EOPNOTSUPP;
2078
983c4fcb
PNA		 2079 if (!try_module_get(type->owner)) {
2080 if (nla[NFTA_CHAIN_TYPE])
2081 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
508f8ccd 2082 return -ENOENT;
983c4fcb 2083 }
508f8ccd
PNA		 2084
2085 hook->type = type;
2086
d54725cd 2087 INIT_LIST_HEAD(&hook->list);
d3519cb8 2088 if (nft_base_chain_netdev(family, hook->num)) {
d54725cd
PNA		 2089 err = nft_chain_parse_netdev(net, ha, &hook->list);
2090 if (err < 0) {
508f8ccd 2091 module_put(type->owner);
d54725cd 2092 return err;
508f8ccd 2093 }
d54725cd 2094 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
508f8ccd
PNA		 2095 module_put(type->owner);
2096 return -EOPNOTSUPP;
2097 }
2098
2099 return 0;
2100}
2101
2102static void nft_chain_release_hook(struct nft_chain_hook *hook)
2103{
d54725cd
PNA		 2104 struct nft_hook *h, *next;
2105
2106 list_for_each_entry_safe(h, next, &hook->list, list) {
2107 list_del(&h->list);
2108 kfree(h);
2109 }
508f8ccd 2110 module_put(hook->type->owner);
508f8ccd
PNA		 2111}
2112
0cbc06b3
FW		 2113struct nft_rules_old {
2114 struct rcu_head h;
2c865a8a 2115 struct nft_rule_blob *blob;
0cbc06b3
FW		 2116};
2117
2c865a8a 2118static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
0cbc06b3 2119{
2c865a8a
PNA		 2120 struct nft_rule_dp *prule;
2121
2122 prule = (struct nft_rule_dp *)ptr;
2123 prule->is_last = 1;
2c865a8a
PNA		 2124 /* blob size does not include the trailer rule */
2125}
2126
2127static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2128{
2129 struct nft_rule_blob *blob;
2130
2131 /* size must include room for the last rule */
2132 if (size < offsetof(struct nft_rule_dp, data))
2133 return NULL;
2134
2135 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2136 if (size > INT_MAX)
0cbc06b3
FW		 2137 return NULL;
2138
33758c89 2139 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2c865a8a 2140 if (!blob)
0cbc06b3
FW		 2141 return NULL;
2142
2c865a8a
PNA		 2143 blob->size = 0;
2144 nft_last_rule(blob, blob->data);
0cbc06b3 2145
2c865a8a 2146 return blob;
0cbc06b3
FW		 2147}
2148
d54725cd
PNA		 2149static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2150 const struct nft_chain_hook *hook,
2151 struct nft_chain *chain)
2152{
c5c6accd
FW		 2153 ops->pf = family;
2154 ops->hooknum = hook->num;
2155 ops->priority = hook->priority;
2156 ops->priv = chain;
2157 ops->hook = hook->type->hooks[ops->hooknum];
2158 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
d54725cd
PNA		 2159}
2160
2161static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2162 struct nft_chain_hook *hook, u32 flags)
2163{
2164 struct nft_chain *chain;
2165 struct nft_hook *h;
2166
2167 basechain->type = hook->type;
2168 INIT_LIST_HEAD(&basechain->hook_list);
2169 chain = &basechain->chain;
2170
d3519cb8 2171 if (nft_base_chain_netdev(family, hook->num)) {
d54725cd
PNA		 2172 list_splice_init(&hook->list, &basechain->hook_list);
2173 list_for_each_entry(h, &basechain->hook_list, list)
2174 nft_basechain_hook_init(&h->ops, family, hook, chain);
2175
2176 basechain->ops.hooknum = hook->num;
2177 basechain->ops.priority = hook->priority;
2178 } else {
2179 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2180 }
2181
67c49de4 2182 chain->flags |= NFT_CHAIN_BASE | flags;
d54725cd
PNA		 2183 basechain->policy = NF_ACCEPT;
2184 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
77972a36
PNA		 2185 !nft_chain_offload_support(basechain)) {
2186 list_splice_init(&basechain->hook_list, &hook->list);
d54725cd 2187 return -EOPNOTSUPP;
77972a36 2188 }
d54725cd
PNA		 2189
2190 flow_block_init(&basechain->flow_block);
2191
2192 return 0;
2193}
2194
04b7db41
PNA		 2195static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2196{
2197 int err;
2198
2199 err = rhltable_insert_key(&table->chains_ht, chain->name,
2200 &chain->rhlhead, nft_chain_ht_params);
2201 if (err)
2202 return err;
2203
2204 list_add_tail_rcu(&chain->list, &table->chains);
2205
2206 return 0;
2207}
2208
d0e2c7de
PNA		 2209static u64 chain_id;
2210
4035285f 2211static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
983c4fcb
PNA		 2212 u8 policy, u32 flags,
2213 struct netlink_ext_ack *extack)
4035285f
PNA		 2214{
2215 const struct nlattr * const *nla = ctx->nla;
2216 struct nft_table *table = ctx->table;
4035285f 2217 struct nft_base_chain *basechain;
4035285f 2218 struct net *net = ctx->net;
d0e2c7de 2219 char name[NFT_NAME_MAXLEN];
2c865a8a 2220 struct nft_rule_blob *blob;
66293c46 2221 struct nft_trans *trans;
4035285f 2222 struct nft_chain *chain;
2c865a8a 2223 unsigned int data_size;
4035285f
PNA		 2224 int err;
2225
2226 if (table->use == UINT_MAX)
2227 return -EOVERFLOW;
2228
2229 if (nla[NFTA_CHAIN_HOOK]) {
921ebde3 2230 struct nft_stats __percpu *stats = NULL;
4035285f 2231 struct nft_chain_hook hook;
4035285f 2232
d0e2c7de
PNA		 2233 if (flags & NFT_CHAIN_BINDING)
2234 return -EOPNOTSUPP;
2235
983c4fcb
PNA		 2236 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2237 true);
4035285f
PNA		 2238 if (err < 0)
2239 return err;
2240
33758c89 2241 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
4035285f
PNA		 2242 if (basechain == NULL) {
2243 nft_chain_release_hook(&hook);
2244 return -ENOMEM;
2245 }
d54725cd 2246 chain = &basechain->chain;
4035285f
PNA		 2247
2248 if (nla[NFTA_CHAIN_COUNTERS]) {
2249 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2250 if (IS_ERR(stats)) {
2251 nft_chain_release_hook(&hook);
2252 kfree(basechain);
2253 return PTR_ERR(stats);
2254 }
4c05ec47 2255 rcu_assign_pointer(basechain->stats, stats);
4035285f
PNA		 2256 }
2257
d54725cd
PNA		 2258 err = nft_basechain_init(basechain, family, &hook, flags);
2259 if (err < 0) {
2260 nft_chain_release_hook(&hook);
2261 kfree(basechain);
9a4d6dd5 2262 free_percpu(stats);
d54725cd
PNA		 2263 return err;
2264 }
921ebde3
TH		 2265 if (stats)
2266 static_branch_inc(&nft_counters_enabled);
4035285f 2267 } else {
d0e2c7de
PNA		 2268 if (flags & NFT_CHAIN_BASE)
2269 return -EINVAL;
2270 if (flags & NFT_CHAIN_HW_OFFLOAD)
2271 return -EOPNOTSUPP;
2272
33758c89 2273 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
4035285f
PNA		 2274 if (chain == NULL)
2275 return -ENOMEM;
d0e2c7de
PNA		 2276
2277 chain->flags = flags;
4035285f 2278 }
43a605f2
PNA		 2279 ctx->chain = chain;
2280
4035285f
PNA		 2281 INIT_LIST_HEAD(&chain->rules);
2282 chain->handle = nf_tables_alloc_handle(table);
2283 chain->table = table;
d0e2c7de
PNA		 2284
2285 if (nla[NFTA_CHAIN_NAME]) {
33758c89 2286 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
d0e2c7de 2287 } else {
59136aa3
FW		 2288 if (!(flags & NFT_CHAIN_BINDING)) {
2289 err = -EINVAL;
002f2176 2290 goto err_destroy_chain;
59136aa3 2291 }
d0e2c7de
PNA		 2292
2293 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
33758c89 2294 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
d0e2c7de
PNA		 2295 }
2296
4035285f
PNA		 2297 if (!chain->name) {
2298 err = -ENOMEM;
002f2176
JGG		 2299 goto err_destroy_chain;
2300 }
2301
2302 if (nla[NFTA_CHAIN_USERDATA]) {
33758c89 2303 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
002f2176
JGG		 2304 if (chain->udata == NULL) {
2305 err = -ENOMEM;
2306 goto err_destroy_chain;
2307 }
2308 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
4035285f
PNA		 2309 }
2310
2c865a8a
PNA		 2311 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2312 blob = nf_tables_chain_alloc_rules(data_size);
2313 if (!blob) {
0cbc06b3 2314 err = -ENOMEM;
002f2176 2315 goto err_destroy_chain;
0cbc06b3
FW		 2316 }
2317
2c865a8a
PNA		 2318 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2319 RCU_INIT_POINTER(chain->blob_gen_1, blob);
0cbc06b3 2320
c974a3a3 2321 err = nf_tables_register_hook(net, table, chain);
4035285f 2322 if (err < 0)
002f2176 2323 goto err_destroy_chain;
4035285f 2324
66293c46
FW		 2325 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2326 if (IS_ERR(trans)) {
2327 err = PTR_ERR(trans);
002f2176 2328 goto err_unregister_hook;
1b2470e5 2329 }
4035285f 2330
ad652f38 2331 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
66293c46
FW		 2332 if (nft_is_base_chain(chain))
2333 nft_trans_chain_policy(trans) = policy;
2334
04b7db41
PNA		 2335 err = nft_chain_add(table, chain);
2336 if (err < 0) {
2337 nft_trans_destroy(trans);
002f2176 2338 goto err_unregister_hook;
04b7db41
PNA		 2339 }
2340
4035285f 2341 table->use++;
4035285f
PNA		 2342
2343 return 0;
002f2176 2344err_unregister_hook:
c974a3a3 2345 nf_tables_unregister_hook(net, table, chain);
002f2176 2346err_destroy_chain:
43a605f2 2347 nf_tables_chain_destroy(ctx);
4035285f
PNA		 2348
2349 return err;
2350}
2351
d54725cd
PNA		 2352static bool nft_hook_list_equal(struct list_head *hook_list1,
2353 struct list_head *hook_list2)
2354{
2355 struct nft_hook *hook;
2356 int n = 0, m = 0;
2357
2358 n = 0;
2359 list_for_each_entry(hook, hook_list2, list) {
2360 if (!nft_hook_list_find(hook_list1, hook))
2361 return false;
2362
2363 n++;
2364 }
2365 list_for_each_entry(hook, hook_list1, list)
2366 m++;
2367
2368 return n == m;
2369}
2370
c9626a2c 2371static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
98a381a7
PNA		 2372 u32 flags, const struct nlattr *attr,
2373 struct netlink_ext_ack *extack)
2c4a488a
PNA		 2374{
2375 const struct nlattr * const *nla = ctx->nla;
2376 struct nft_table *table = ctx->table;
2377 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 2378 struct nft_base_chain *basechain;
2379 struct nft_stats *stats = NULL;
2380 struct nft_chain_hook hook;
2c4a488a
PNA		 2381 struct nf_hook_ops *ops;
2382 struct nft_trans *trans;
c974a3a3 2383 int err;
2c4a488a 2384
c9626a2c
PNA		 2385 if (chain->flags ^ flags)
2386 return -EOPNOTSUPP;
2387
2c4a488a 2388 if (nla[NFTA_CHAIN_HOOK]) {
98a381a7
PNA		 2389 if (!nft_is_base_chain(chain)) {
2390 NL_SET_BAD_ATTR(extack, attr);
77a92189 2391 return -EEXIST;
98a381a7 2392 }
36596dad 2393 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
983c4fcb 2394 extack, false);
2c4a488a
PNA		 2395 if (err < 0)
2396 return err;
2397
2398 basechain = nft_base_chain(chain);
2399 if (basechain->type != hook.type) {
2400 nft_chain_release_hook(&hook);
98a381a7 2401 NL_SET_BAD_ATTR(extack, attr);
77a92189 2402 return -EEXIST;
2c4a488a
PNA		 2403 }
2404
d3519cb8 2405 if (nft_base_chain_netdev(ctx->family, hook.num)) {
d54725cd
PNA		 2406 if (!nft_hook_list_equal(&basechain->hook_list,
2407 &hook.list)) {
2408 nft_chain_release_hook(&hook);
98a381a7 2409 NL_SET_BAD_ATTR(extack, attr);
77a92189 2410 return -EEXIST;
d54725cd
PNA		 2411 }
2412 } else {
2413 ops = &basechain->ops;
2414 if (ops->hooknum != hook.num ||
2415 ops->priority != hook.priority) {
2416 nft_chain_release_hook(&hook);
98a381a7 2417 NL_SET_BAD_ATTR(extack, attr);
77a92189 2418 return -EEXIST;
d54725cd 2419 }
2c4a488a
PNA		 2420 }
2421 nft_chain_release_hook(&hook);
2422 }
2423
2424 if (nla[NFTA_CHAIN_HANDLE] &&
2425 nla[NFTA_CHAIN_NAME]) {
2426 struct nft_chain *chain2;
2427
f102d66b
FW		 2428 chain2 = nft_chain_lookup(ctx->net, table,
2429 nla[NFTA_CHAIN_NAME], genmask);
98a381a7
PNA		 2430 if (!IS_ERR(chain2)) {
2431 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
0d18779b 2432 return -EEXIST;
98a381a7 2433 }
2c4a488a
PNA		 2434 }
2435
2436 if (nla[NFTA_CHAIN_COUNTERS]) {
2437 if (!nft_is_base_chain(chain))
2438 return -EOPNOTSUPP;
2439
2440 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2441 if (IS_ERR(stats))
2442 return PTR_ERR(stats);
2443 }
2444
c6cc94df 2445 err = -ENOMEM;
2c4a488a
PNA		 2446 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2447 sizeof(struct nft_trans_chain));
c6cc94df
FW		 2448 if (trans == NULL)
2449 goto err;
2c4a488a
PNA		 2450
2451 nft_trans_chain_stats(trans) = stats;
2452 nft_trans_chain_update(trans) = true;
2453
2454 if (nla[NFTA_CHAIN_POLICY])
2455 nft_trans_chain_policy(trans) = policy;
2456 else
2457 nft_trans_chain_policy(trans) = -1;
2458
c6cc94df
FW		 2459 if (nla[NFTA_CHAIN_HANDLE] &&
2460 nla[NFTA_CHAIN_NAME]) {
d59d2f82 2461 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
c6cc94df
FW		 2462 struct nft_trans *tmp;
2463 char *name;
2464
2465 err = -ENOMEM;
33758c89 2466 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
c6cc94df
FW		 2467 if (!name)
2468 goto err;
2469
2470 err = -EEXIST;
0854db2a 2471 list_for_each_entry(tmp, &nft_net->commit_list, list) {
c6cc94df
FW		 2472 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2473 tmp->ctx.table == table &&
2474 nft_trans_chain_update(tmp) &&
2475 nft_trans_chain_name(tmp) &&
2476 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
98a381a7 2477 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
c6cc94df
FW		 2478 kfree(name);
2479 goto err;
2480 }
2c4a488a 2481 }
c6cc94df
FW		 2482
2483 nft_trans_chain_name(trans) = name;
2c4a488a 2484 }
0854db2a 2485 nft_trans_commit_list_add_tail(ctx->net, trans);
2c4a488a
PNA		 2486
2487 return 0;
c6cc94df
FW		 2488err:
2489 free_percpu(stats);
2490 kfree(trans);
2491 return err;
2c4a488a
PNA		 2492}
2493
837830a4 2494static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
95f466d2 2495 const struct nft_table *table,
837830a4
PNA		 2496 const struct nlattr *nla)
2497{
d59d2f82 2498 struct nftables_pernet *nft_net = nft_pernet(net);
837830a4
PNA		 2499 u32 id = ntohl(nla_get_be32(nla));
2500 struct nft_trans *trans;
2501
0854db2a 2502 list_for_each_entry(trans, &nft_net->commit_list, list) {
837830a4
PNA		 2503 struct nft_chain *chain = trans->ctx.chain;
2504
2505 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
95f466d2 2506 chain->table == table &&
837830a4
PNA		 2507 id == nft_trans_chain_id(trans))
2508 return chain;
2509 }
2510 return ERR_PTR(-ENOENT);
2511}
2512
7dab8ee3
PNA		 2513static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2514 const struct nlattr * const nla[])
96518518 2515{
7dab8ee3 2516 struct nftables_pernet *nft_net = nft_pernet(info->net);
7dab8ee3
PNA		 2517 struct netlink_ext_ack *extack = info->extack;
2518 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 2519 u8 family = info->nfmsg->nfgen_family;
74cccc3d 2520 struct nft_chain *chain = NULL;
7dab8ee3 2521 struct net *net = info->net;
36dd1bcc 2522 const struct nlattr *attr;
96518518 2523 struct nft_table *table;
57de2a0c 2524 u8 policy = NF_ACCEPT;
4035285f 2525 struct nft_ctx ctx;
96518518 2526 u64 handle = 0;
c9626a2c 2527 u32 flags = 0;
96518518 2528
0854db2a 2529 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b 2530
6001a930
PNA		 2531 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2532 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 2533 if (IS_ERR(table)) {
2534 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2535 return PTR_ERR(table);
36dd1bcc 2536 }
96518518 2537
96518518 2538 chain = NULL;
36dd1bcc 2539 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 2540
2541 if (nla[NFTA_CHAIN_HANDLE]) {
2542 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 2543 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 2544 if (IS_ERR(chain)) {
2545 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 2546 return PTR_ERR(chain);
36dd1bcc
PNA		 2547 }
2548 attr = nla[NFTA_CHAIN_HANDLE];
74cccc3d 2549 } else if (nla[NFTA_CHAIN_NAME]) {
f102d66b 2550 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 2551 if (IS_ERR(chain)) {
36dd1bcc
PNA		 2552 if (PTR_ERR(chain) != -ENOENT) {
2553 NL_SET_BAD_ATTR(extack, attr);
96518518 2554 return PTR_ERR(chain);
36dd1bcc 2555 }
96518518
PM		 2556 chain = NULL;
2557 }
74cccc3d
PNA		 2558 } else if (!nla[NFTA_CHAIN_ID]) {
2559 return -EINVAL;
96518518
PM		 2560 }
2561
57de2a0c 2562 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 2563 if (chain != NULL &&
36dd1bcc
PNA		 2564 !nft_is_base_chain(chain)) {
2565 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 2566 return -EOPNOTSUPP;
36dd1bcc 2567 }
d6b6cb1d
PNA		 2568
2569 if (chain == NULL &&
36dd1bcc
PNA		 2570 nla[NFTA_CHAIN_HOOK] == NULL) {
2571 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 2572 return -EOPNOTSUPP;
36dd1bcc 2573 }
57de2a0c 2574
8f46df18 2575 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 2576 switch (policy) {
2577 case NF_DROP:
2578 case NF_ACCEPT:
2579 break;
2580 default:
2581 return -EINVAL;
2582 }
2583 }
2584
c9626a2c
PNA		 2585 if (nla[NFTA_CHAIN_FLAGS])
2586 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
b717273d
FW		 2587 else if (chain)
2588 flags = chain->flags;
c9626a2c 2589
c1f79a2e
PNA		 2590 if (flags & ~NFT_CHAIN_FLAGS)
2591 return -EOPNOTSUPP;
2592
7dab8ee3 2593 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4035285f 2594
96518518 2595 if (chain != NULL) {
5dc52d83
PNA		 2596 if (chain->flags & NFT_CHAIN_BINDING)
2597 return -EINVAL;
2598
7dab8ee3 2599 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 2600 NL_SET_BAD_ATTR(extack, attr);
96518518 2601 return -EEXIST;
36dd1bcc 2602 }
7dab8ee3 2603 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 2604 return -EOPNOTSUPP;
2605
67c49de4 2606 flags |= chain->flags & NFT_CHAIN_BASE;
98a381a7
PNA		 2607 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2608 extack);
96518518
PM		 2609 }
2610
983c4fcb 2611 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
96518518
PM		 2612}
2613
7dab8ee3
PNA		 2614static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2615 const struct nlattr * const nla[])
96518518 2616{
7dab8ee3
PNA		 2617 struct netlink_ext_ack *extack = info->extack;
2618 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 2619 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 2620 struct net *net = info->net;
36dd1bcc 2621 const struct nlattr *attr;
96518518
PM		 2622 struct nft_table *table;
2623 struct nft_chain *chain;
9dee1474 2624 struct nft_rule *rule;
91c7b38d 2625 struct nft_ctx ctx;
3ecbfd65 2626 u64 handle;
9dee1474
PNA		 2627 u32 use;
2628 int err;
96518518 2629
6001a930
PNA		 2630 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2631 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 2632 if (IS_ERR(table)) {
2633 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2634 return PTR_ERR(table);
36dd1bcc 2635 }
96518518 2636
3ecbfd65 2637 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 2638 attr = nla[NFTA_CHAIN_HANDLE];
2639 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 2640 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 2641 } else {
36dd1bcc 2642 attr = nla[NFTA_CHAIN_NAME];
f102d66b 2643 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 2644 }
36dd1bcc 2645 if (IS_ERR(chain)) {
f80a612d
FFM		 2646 if (PTR_ERR(chain) == -ENOENT &&
2647 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2648 return 0;
2649
36dd1bcc 2650 NL_SET_BAD_ATTR(extack, attr);
96518518 2651 return PTR_ERR(chain);
36dd1bcc 2652 }
9dee1474 2653
7dab8ee3 2654 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
9dee1474 2655 chain->use > 0)
96518518
PM		 2656 return -EBUSY;
2657
7dab8ee3 2658 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
0165d932 2659
9dee1474
PNA		 2660 use = chain->use;
2661 list_for_each_entry(rule, &chain->rules, list) {
2662 if (!nft_is_active_next(net, rule))
2663 continue;
2664 use--;
2665
2666 err = nft_delrule(&ctx, rule);
2667 if (err < 0)
2668 return err;
2669 }
2670
2671 /* There are rules and elements that are still holding references to us,
2672 * we cannot do a recursive removal in this case.
2673 */
36dd1bcc
PNA		 2674 if (use > 0) {
2675 NL_SET_BAD_ATTR(extack, attr);
9dee1474 2676 return -EBUSY;
36dd1bcc 2677 }
9dee1474 2678
ee01d542 2679 return nft_delchain(&ctx);
96518518
PM		 2680}
2681
96518518
PM		 2682/*
2683 * Expressions
2684 */
2685
2686/**
ef1f7df9 2687 * nft_register_expr - register nf_tables expr type
3db86c39 2688 * @type: expr type
96518518 2689 *
ef1f7df9 2690 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 2691 * success or a negative errno code otherwise.
2692 */
ef1f7df9 2693int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 2694{
2695 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 2696 if (type->family == NFPROTO_UNSPEC)
e688a7f8 2697 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 2698 else
e688a7f8 2699 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 2700 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2701 return 0;
2702}
2703EXPORT_SYMBOL_GPL(nft_register_expr);
2704
2705/**
ef1f7df9 2706 * nft_unregister_expr - unregister nf_tables expr type
3db86c39 2707 * @type: expr type
96518518 2708 *
ef1f7df9 2709 * Unregisters the expr typefor use with nf_tables.
96518518 2710 */
ef1f7df9 2711void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 2712{
2713 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2714 list_del_rcu(&type->list);
96518518
PM		 2715 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2716}
2717EXPORT_SYMBOL_GPL(nft_unregister_expr);
2718
64d46806
PM		 2719static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2720 struct nlattr *nla)
96518518 2721{
9cff126f 2722 const struct nft_expr_type *type, *candidate = NULL;
96518518 2723
ef1f7df9 2724 list_for_each_entry(type, &nf_tables_expressions, list) {
9cff126f
PNA		 2725 if (!nla_strcmp(nla, type->name)) {
2726 if (!type->family && !candidate)
2727 candidate = type;
2728 else if (type->family == family)
2729 candidate = type;
2730 }
96518518 2731 }
9cff126f 2732 return candidate;
96518518
PM		 2733}
2734
b9c04ae7
PNA		 2735#ifdef CONFIG_MODULES
2736static int nft_expr_type_request_module(struct net *net, u8 family,
2737 struct nlattr *nla)
2738{
eb014de4
PNA		 2739 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2740 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
b9c04ae7
PNA		 2741 return -EAGAIN;
2742
2743 return 0;
2744}
2745#endif
2746
452238e8
FW		 2747static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2748 u8 family,
64d46806 2749 struct nlattr *nla)
96518518 2750{
ef1f7df9 2751 const struct nft_expr_type *type;
96518518
PM		 2752
2753 if (nla == NULL)
2754 return ERR_PTR(-EINVAL);
2755
64d46806 2756 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 2757 if (type != NULL && try_module_get(type->owner))
2758 return type;
96518518 2759
f102d66b 2760 lockdep_nfnl_nft_mutex_not_held();
96518518 2761#ifdef CONFIG_MODULES
ef1f7df9 2762 if (type == NULL) {
b9c04ae7 2763 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
64d46806
PM		 2764 return ERR_PTR(-EAGAIN);
2765
eb014de4
PNA		 2766 if (nft_request_module(net, "nft-expr-%.*s",
2767 nla_len(nla),
2768 (char *)nla_data(nla)) == -EAGAIN)
96518518
PM		 2769 return ERR_PTR(-EAGAIN);
2770 }
2771#endif
2772 return ERR_PTR(-ENOENT);
2773}
2774
2775static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
9332d27d
FW		 2776 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2777 .len = NFT_MODULE_AUTOLOAD_LIMIT },
96518518
PM		 2778 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2779};
2780
2781static int nf_tables_fill_expr_info(struct sk_buff *skb,
8daa8fde 2782 const struct nft_expr *expr, bool reset)
96518518 2783{
ef1f7df9 2784 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 2785 goto nla_put_failure;
2786
2787 if (expr->ops->dump) {
ae0be8de
MK		 2788 struct nlattr *data = nla_nest_start_noflag(skb,
2789 NFTA_EXPR_DATA);
96518518
PM		 2790 if (data == NULL)
2791 goto nla_put_failure;
8daa8fde 2792 if (expr->ops->dump(skb, expr, reset) < 0)
96518518
PM		 2793 goto nla_put_failure;
2794 nla_nest_end(skb, data);
2795 }
2796
2797 return skb->len;
2798
2799nla_put_failure:
2800 return -1;
2801};
2802
0b2d8a7b 2803int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
8daa8fde 2804 const struct nft_expr *expr, bool reset)
0b2d8a7b
PM		 2805{
2806 struct nlattr *nest;
2807
ae0be8de 2808 nest = nla_nest_start_noflag(skb, attr);
0b2d8a7b
PM		 2809 if (!nest)
2810 goto nla_put_failure;
8daa8fde 2811 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
0b2d8a7b
PM		 2812 goto nla_put_failure;
2813 nla_nest_end(skb, nest);
2814 return 0;
2815
2816nla_put_failure:
2817 return -1;
2818}
2819
96518518
PM		 2820struct nft_expr_info {
2821 const struct nft_expr_ops *ops;
83d9dcba 2822 const struct nlattr *attr;
ef1f7df9 2823 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2824};
2825
0ca743a5
PNA		 2826static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2827 const struct nlattr *nla,
96518518
PM		 2828 struct nft_expr_info *info)
2829{
ef1f7df9 2830 const struct nft_expr_type *type;
96518518 2831 const struct nft_expr_ops *ops;
ef1f7df9 2832 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2833 int err;
2834
8cb08174
JB		 2835 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2836 nft_expr_policy, NULL);
96518518
PM		 2837 if (err < 0)
2838 return err;
2839
452238e8 2840 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2841 if (IS_ERR(type))
2842 return PTR_ERR(type);
2843
2844 if (tb[NFTA_EXPR_DATA]) {
8cb08174
JB		 2845 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2846 tb[NFTA_EXPR_DATA],
2847 type->policy, NULL);
ef1f7df9
PM		 2848 if (err < 0)
2849 goto err1;
2850 } else
2851 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2852
2853 if (type->select_ops != NULL) {
0ca743a5
PNA		 2854 ops = type->select_ops(ctx,
2855 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2856 if (IS_ERR(ops)) {
2857 err = PTR_ERR(ops);
0ef1efd1
PNA		 2858#ifdef CONFIG_MODULES
2859 if (err == -EAGAIN)
eb014de4
PNA		 2860 if (nft_expr_type_request_module(ctx->net,
2861 ctx->family,
2862 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2863 err = -ENOENT;
0ef1efd1 2864#endif
ef1f7df9
PM		 2865 goto err1;
2866 }
2867 } else
2868 ops = type->ops;
2869
83d9dcba 2870 info->attr = nla;
96518518 2871 info->ops = ops;
83d9dcba 2872
96518518 2873 return 0;
ef1f7df9
PM		 2874
2875err1:
2876 module_put(type->owner);
2877 return err;
96518518
PM		 2878}
2879
3a07327d
PNA		 2880int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2881 struct nft_expr_info *info)
2882{
2883 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2884 const struct nft_expr_type *type;
2885 int err;
2886
2887 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2888 nft_expr_policy, NULL);
2889 if (err < 0)
2890 return err;
2891
2892 if (!tb[NFTA_EXPR_DATA])
2893 return -EINVAL;
2894
2895 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
98cbc40e
DC		 2896 if (!type)
2897 return -ENOENT;
3a07327d
PNA		 2898
2899 if (!type->inner_ops)
2900 return -EOPNOTSUPP;
2901
2902 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2903 tb[NFTA_EXPR_DATA],
2904 type->policy, NULL);
2905 if (err < 0)
2906 goto err_nla_parse;
2907
2908 info->attr = nla;
2909 info->ops = type->inner_ops;
2910
2911 return 0;
2912
2913err_nla_parse:
2914 return err;
2915}
2916
96518518 2917static int nf_tables_newexpr(const struct nft_ctx *ctx,
7dab8ee3 2918 const struct nft_expr_info *expr_info,
96518518
PM		 2919 struct nft_expr *expr)
2920{
7dab8ee3 2921 const struct nft_expr_ops *ops = expr_info->ops;
96518518
PM		 2922 int err;
2923
2924 expr->ops = ops;
2925 if (ops->init) {
7dab8ee3 2926 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
96518518
PM		 2927 if (err < 0)
2928 goto err1;
2929 }
2930
96518518 2931 return 0;
96518518
PM		 2932err1:
2933 expr->ops = NULL;
2934 return err;
2935}
2936
62472bce
PM		 2937static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2938 struct nft_expr *expr)
96518518 2939{
3f3a390d
PNA		 2940 const struct nft_expr_type *type = expr->ops->type;
2941
96518518 2942 if (expr->ops->destroy)
62472bce 2943 expr->ops->destroy(ctx, expr);
3f3a390d 2944 module_put(type->owner);
96518518
PM		 2945}
2946
795a6d6b
PNA		 2947static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2948 const struct nlattr *nla)
0b2d8a7b 2949{
7dab8ee3 2950 struct nft_expr_info expr_info;
0b2d8a7b 2951 struct nft_expr *expr;
b8e20400 2952 struct module *owner;
0b2d8a7b
PM		 2953 int err;
2954
7dab8ee3 2955 err = nf_tables_expr_parse(ctx, nla, &expr_info);
0b2d8a7b 2956 if (err < 0)
52077804
PNA		 2957 goto err_expr_parse;
2958
2959 err = -EOPNOTSUPP;
2960 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2961 goto err_expr_stateful;
0b2d8a7b
PM		 2962
2963 err = -ENOMEM;
33758c89 2964 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
0b2d8a7b 2965 if (expr == NULL)
52077804 2966 goto err_expr_stateful;
0b2d8a7b 2967
7dab8ee3 2968 err = nf_tables_newexpr(ctx, &expr_info, expr);
0b2d8a7b 2969 if (err < 0)
52077804 2970 goto err_expr_new;
0b2d8a7b
PM		 2971
2972 return expr;
52077804 2973err_expr_new:
6cafaf47 2974 kfree(expr);
52077804 2975err_expr_stateful:
7dab8ee3
PNA		 2976 owner = expr_info.ops->type->owner;
2977 if (expr_info.ops->type->release_ops)
2978 expr_info.ops->type->release_ops(expr_info.ops);
b8e20400
PNA		 2979
2980 module_put(owner);
52077804 2981err_expr_parse:
0b2d8a7b
PM		 2982 return ERR_PTR(err);
2983}
2984
c604cc69
PNA		 2985int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2986{
2987 int err;
2988
2989 if (src->ops->clone) {
2990 dst->ops = src->ops;
2991 err = src->ops->clone(dst, src);
2992 if (err < 0)
2993 return err;
2994 } else {
2995 memcpy(dst, src, src->ops->size);
2996 }
2997
2998 __module_get(src->ops->type->owner);
2999
3000 return 0;
3001}
3002
0b2d8a7b
PM		 3003void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3004{
3005 nf_tables_expr_destroy(ctx, expr);
3006 kfree(expr);
3007}
3008
96518518
PM		 3009/*
3010 * Rules
3011 */
3012
cac20fcd
PNA		 3013static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3014 u64 handle)
96518518
PM		 3015{
3016 struct nft_rule *rule;
3017
3018 // FIXME: this sucks
d9adf22a 3019 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 3020 if (handle == rule->handle)
3021 return rule;
3022 }
3023
3024 return ERR_PTR(-ENOENT);
3025}
3026
cac20fcd
PNA		 3027static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3028 const struct nlattr *nla)
96518518
PM		 3029{
3030 if (nla == NULL)
3031 return ERR_PTR(-EINVAL);
3032
cac20fcd 3033 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 3034}
3035
3036static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 3037 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3038 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 3039 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3040 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3041 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3042 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 3043 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 3044 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 3045 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3046 .len = NFT_USERDATA_MAXLEN },
467697d2 3047 [NFTA_RULE_ID] = { .type = NLA_U32 },
0604628b 3048 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
837830a4 3049 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 3050};
3051
84d7fce6
PNA		 3052static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3053 u32 portid, u32 seq, int event,
3054 u32 flags, int family,
96518518
PM		 3055 const struct nft_table *table,
3056 const struct nft_chain *chain,
8daa8fde
PS		 3057 const struct nft_rule *rule, u64 handle,
3058 bool reset)
96518518
PM		 3059{
3060 struct nlmsghdr *nlh;
96518518
PM		 3061 const struct nft_expr *expr, *next;
3062 struct nlattr *list;
dedb67c4 3063 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 3064
19c28b13
PNA		 3065 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3066 nft_base_seq(net));
3067 if (!nlh)
96518518
PM		 3068 goto nla_put_failure;
3069
96518518
PM		 3070 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3071 goto nla_put_failure;
3072 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3073 goto nla_put_failure;
b46f6ded
ND		 3074 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3075 NFTA_RULE_PAD))
96518518
PM		 3076 goto nla_put_failure;
3077
e189ae16
PNA		 3078 if (event != NFT_MSG_DELRULE && handle) {
3079 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
b46f6ded 3080 NFTA_RULE_PAD))
5e948466
EL		 3081 goto nla_put_failure;
3082 }
3083
b72920f6
PNA		 3084 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3085 nft_flow_rule_stats(chain, rule);
3086
ae0be8de 3087 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
96518518
PM		 3088 if (list == NULL)
3089 goto nla_put_failure;
3090 nft_rule_for_each_expr(expr, next, rule) {
8daa8fde 3091 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
96518518 3092 goto nla_put_failure;
96518518
PM		 3093 }
3094 nla_nest_end(skb, list);
3095
86f1ec32
PM		 3096 if (rule->udata) {
3097 struct nft_userdata *udata = nft_userdata(rule);
3098 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3099 udata->data) < 0)
3100 goto nla_put_failure;
3101 }
0768b3b3 3102
053c095a
JB		 3103 nlmsg_end(skb, nlh);
3104 return 0;
96518518
PM		 3105
3106nla_put_failure:
3107 nlmsg_trim(skb, nlh);
3108 return -1;
3109}
3110
25e94a99
PNA		 3111static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3112 const struct nft_rule *rule, int event)
96518518 3113{
d59d2f82 3114 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
e189ae16 3115 const struct nft_rule *prule;
96518518 3116 struct sk_buff *skb;
e189ae16
PNA		 3117 u64 handle = 0;
3118 u16 flags = 0;
96518518
PM		 3119 int err;
3120
128ad332
PNA		 3121 if (!ctx->report &&
3122 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3123 return;
96518518 3124
96518518
PM		 3125 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3126 if (skb == NULL)
3127 goto err;
3128
e189ae16
PNA		 3129 if (event == NFT_MSG_NEWRULE &&
3130 !list_is_first(&rule->list, &ctx->chain->rules) &&
3131 !list_is_last(&rule->list, &ctx->chain->rules)) {
3132 prule = list_prev_entry(rule, list);
3133 handle = prule->handle;
3134 }
3135 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3136 flags |= NLM_F_APPEND;
6fb721cf
PNA		 3137 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3138 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
e189ae16 3139
84d7fce6 3140 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
e189ae16 3141 event, flags, ctx->family, ctx->table,
8daa8fde 3142 ctx->chain, rule, handle, false);
96518518
PM		 3143 if (err < 0) {
3144 kfree_skb(skb);
3145 goto err;
3146 }
3147
0854db2a 3148 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 3149 return;
96518518 3150err:
25e94a99 3151 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 3152}
3153
6e1f760e 3154struct nft_rule_dump_ctx {
e46abbcc 3155 char *table;
b7263e07 3156 char *chain;
6e1f760e
PNA		 3157};
3158
241faece
PS		 3159static int __nf_tables_dump_rules(struct sk_buff *skb,
3160 unsigned int *idx,
3161 struct netlink_callback *cb,
3162 const struct nft_table *table,
8daa8fde
PS		 3163 const struct nft_chain *chain,
3164 bool reset)
241faece
PS		 3165{
3166 struct net *net = sock_net(skb->sk);
2c82c7e7 3167 const struct nft_rule *rule, *prule;
241faece 3168 unsigned int s_idx = cb->args[0];
e189ae16 3169 u64 handle;
241faece 3170
2c82c7e7 3171 prule = NULL;
241faece
PS		 3172 list_for_each_entry_rcu(rule, &chain->rules, list) {
3173 if (!nft_is_active(net, rule))
2c82c7e7 3174 goto cont_skip;
241faece
PS		 3175 if (*idx < s_idx)
3176 goto cont;
3177 if (*idx > s_idx) {
3178 memset(&cb->args[1], 0,
3179 sizeof(cb->args) - sizeof(cb->args[0]));
3180 }
e189ae16
PNA		 3181 if (prule)
3182 handle = prule->handle;
3183 else
3184 handle = 0;
3185
241faece
PS		 3186 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3187 cb->nlh->nlmsg_seq,
3188 NFT_MSG_NEWRULE,
3189 NLM_F_MULTI | NLM_F_APPEND,
3190 table->family,
8daa8fde 3191 table, chain, rule, handle, reset) < 0)
310529e6 3192 return 1;
241faece
PS		 3193
3194 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3195cont:
2c82c7e7
FW		 3196 prule = rule;
3197cont_skip:
241faece
PS		 3198 (*idx)++;
3199 }
310529e6 3200 return 0;
241faece
PS		 3201}
3202
96518518
PM		 3203static int nf_tables_dump_rules(struct sk_buff *skb,
3204 struct netlink_callback *cb)
3205{
3206 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 3207 const struct nft_rule_dump_ctx *ctx = cb->data;
241faece 3208 struct nft_table *table;
96518518 3209 const struct nft_chain *chain;
241faece 3210 unsigned int idx = 0;
99633ab2 3211 struct net *net = sock_net(skb->sk);
96518518 3212 int family = nfmsg->nfgen_family;
0854db2a 3213 struct nftables_pernet *nft_net;
8daa8fde
PS		 3214 bool reset = false;
3215
3216 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3217 reset = true;
96518518 3218
e688a7f8 3219 rcu_read_lock();
d59d2f82 3220 nft_net = nft_pernet(net);
34002783 3221 cb->seq = READ_ONCE(nft_net->base_seq);
38e029f1 3222
0854db2a 3223 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 3224 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 3225 continue;
3226
3227 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 3228 continue;
3229
715849ab 3230 if (ctx && ctx->table && ctx->chain) {
241faece 3231 struct rhlist_head *list, *tmp;
6e1f760e 3232
241faece
PS		 3233 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3234 nft_chain_ht_params);
3235 if (!list)
3236 goto done;
3237
3238 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3239 if (!nft_is_active(net, chain))
3240 continue;
3241 __nf_tables_dump_rules(skb, &idx,
8daa8fde 3242 cb, table, chain, reset);
241faece 3243 break;
96518518 3244 }
241faece 3245 goto done;
96518518 3246 }
241faece
PS		 3247
3248 list_for_each_entry_rcu(chain, &table->chains, list) {
8daa8fde
PS		 3249 if (__nf_tables_dump_rules(skb, &idx,
3250 cb, table, chain, reset))
241faece
PS		 3251 goto done;
3252 }
3253
3254 if (ctx && ctx->table)
3255 break;
96518518
PM		 3256 }
3257done:
e688a7f8 3258 rcu_read_unlock();
310529e6
PS		 3259
3260 cb->args[0] = idx;
96518518
PM		 3261 return skb->len;
3262}
3263
90fd131a
FW		 3264static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3265{
3266 const struct nlattr * const *nla = cb->data;
3267 struct nft_rule_dump_ctx *ctx = NULL;
3268
3269 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3270 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3271 if (!ctx)
3272 return -ENOMEM;
3273
3274 if (nla[NFTA_RULE_TABLE]) {
3275 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3276 GFP_ATOMIC);
3277 if (!ctx->table) {
3278 kfree(ctx);
3279 return -ENOMEM;
3280 }
3281 }
3282 if (nla[NFTA_RULE_CHAIN]) {
3283 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3284 GFP_ATOMIC);
3285 if (!ctx->chain) {
3286 kfree(ctx->table);
3287 kfree(ctx);
3288 return -ENOMEM;
3289 }
3290 }
3291 }
3292
3293 cb->data = ctx;
3294 return 0;
3295}
3296
6e1f760e
PNA		 3297static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3298{
e46abbcc
PS		 3299 struct nft_rule_dump_ctx *ctx = cb->data;
3300
3301 if (ctx) {
3302 kfree(ctx->table);
b7263e07 3303 kfree(ctx->chain);
e46abbcc
PS		 3304 kfree(ctx);
3305 }
6e1f760e
PNA		 3306 return 0;
3307}
3308
d9adf22a 3309/* called with rcu_read_lock held */
797d4980
PNA		 3310static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3311 const struct nlattr * const nla[])
96518518 3312{
797d4980
PNA		 3313 struct netlink_ext_ack *extack = info->extack;
3314 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 3315 u8 family = info->nfmsg->nfgen_family;
96518518
PM		 3316 const struct nft_chain *chain;
3317 const struct nft_rule *rule;
797d4980 3318 struct net *net = info->net;
1b2470e5 3319 struct nft_table *table;
96518518 3320 struct sk_buff *skb2;
8daa8fde 3321 bool reset = false;
96518518
PM		 3322 int err;
3323
797d4980 3324 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
96518518 3325 struct netlink_dump_control c = {
90fd131a 3326 .start= nf_tables_dump_rules_start,
96518518 3327 .dump = nf_tables_dump_rules,
6e1f760e 3328 .done = nf_tables_dump_rules_done,
d9adf22a 3329 .module = THIS_MODULE,
90fd131a 3330 .data = (void *)nla,
96518518 3331 };
6e1f760e 3332
797d4980 3333 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
96518518
PM		 3334 }
3335
6001a930 3336 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
36dd1bcc
PNA		 3337 if (IS_ERR(table)) {
3338 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3339 return PTR_ERR(table);
36dd1bcc 3340 }
96518518 3341
f102d66b 3342 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 3343 if (IS_ERR(chain)) {
3344 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 3345 return PTR_ERR(chain);
36dd1bcc 3346 }
96518518 3347
cac20fcd 3348 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3349 if (IS_ERR(rule)) {
3350 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3351 return PTR_ERR(rule);
36dd1bcc 3352 }
96518518 3353
d9adf22a 3354 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 3355 if (!skb2)
3356 return -ENOMEM;
3357
8daa8fde
PS		 3358 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3359 reset = true;
3360
84d7fce6 3361 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
797d4980 3362 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
8daa8fde 3363 family, table, chain, rule, 0, reset);
96518518 3364 if (err < 0)
ee921183 3365 goto err_fill_rule_info;
96518518 3366
ee921183 3367 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 3368
ee921183 3369err_fill_rule_info:
96518518
PM		 3370 kfree_skb(skb2);
3371 return err;
3372}
3373
62472bce
PM		 3374static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3375 struct nft_rule *rule)
96518518 3376{
29e38801 3377 struct nft_expr *expr, *next;
96518518
PM		 3378
3379 /*
3380 * Careful: some expressions might not be initialized in case this
3381 * is called on error from nf_tables_newrule().
3382 */
3383 expr = nft_expr_first(rule);
31cc578a 3384 while (nft_expr_more(rule, expr)) {
29e38801 3385 next = nft_expr_next(expr);
62472bce 3386 nf_tables_expr_destroy(ctx, expr);
29e38801 3387 expr = next;
96518518
PM		 3388 }
3389 kfree(rule);
3390}
3391
d0e2c7de 3392void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
bb7b40ae 3393{
f6ac8585 3394 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
bb7b40ae
PNA		 3395 nf_tables_rule_destroy(ctx, rule);
3396}
3397
a654de8f
PNA		 3398int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3399{
3400 struct nft_expr *expr, *last;
3401 const struct nft_data *data;
3402 struct nft_rule *rule;
3403 int err;
3404
26b2f552
TY		 3405 if (ctx->level == NFT_JUMP_STACK_SIZE)
3406 return -EMLINK;
3407
a654de8f
PNA		 3408 list_for_each_entry(rule, &chain->rules, list) {
3409 if (!nft_is_active_next(ctx->net, rule))
3410 continue;
3411
3412 nft_rule_for_each_expr(expr, last, rule) {
3413 if (!expr->ops->validate)
3414 continue;
3415
3416 err = expr->ops->validate(ctx, expr, &data);
3417 if (err < 0)
3418 return err;
3419 }
81ea0106
FW		 3420
3421 cond_resched();
a654de8f
PNA		 3422 }
3423
3424 return 0;
3425}
3426EXPORT_SYMBOL_GPL(nft_chain_validate);
3427
3428static int nft_table_validate(struct net *net, const struct nft_table *table)
3429{
3430 struct nft_chain *chain;
3431 struct nft_ctx ctx = {
3432 .net = net,
3433 .family = table->family,
3434 };
3435 int err;
3436
3437 list_for_each_entry(chain, &table->chains, list) {
3438 if (!nft_is_base_chain(chain))
3439 continue;
3440
3441 ctx.chain = chain;
3442 err = nft_chain_validate(&ctx, chain);
3443 if (err < 0)
3444 return err;
3445 }
3446
3447 return 0;
3448}
3449
d46fc894
PNA		 3450int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3451 const struct nft_set_iter *iter,
3452 struct nft_set_elem *elem)
3453{
3454 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3455 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3456 const struct nft_data *data;
3457 int err;
3458
3459 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3460 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3461 return 0;
3462
3463 data = nft_set_ext_data(ext);
3464 switch (data->verdict.code) {
3465 case NFT_JUMP:
3466 case NFT_GOTO:
3467 pctx->level++;
3468 err = nft_chain_validate(ctx, data->verdict.chain);
3469 if (err < 0)
3470 return err;
3471 pctx->level--;
3472 break;
3473 default:
3474 break;
3475 }
3476
3477 return 0;
3478}
3479
3480struct nft_set_elem_catchall {
3481 struct list_head list;
3482 struct rcu_head rcu;
3483 void *elem;
3484};
3485
3486int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3487{
3488 u8 genmask = nft_genmask_next(ctx->net);
3489 struct nft_set_elem_catchall *catchall;
3490 struct nft_set_elem elem;
3491 struct nft_set_ext *ext;
3492 int ret = 0;
3493
3494 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3495 ext = nft_set_elem_ext(set, catchall->elem);
3496 if (!nft_set_elem_active(ext, genmask))
3497 continue;
3498
3499 elem.priv = catchall->elem;
3500 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3501 if (ret < 0)
3502 return ret;
3503 }
3504
3505 return ret;
3506}
3507
75dd48e2 3508static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
36d5b291 3509 const struct nft_chain *chain,
75dd48e2
PS		 3510 const struct nlattr *nla);
3511
1081d11b
PNA		 3512#define NFT_RULE_MAXEXPRS 128
3513
7dab8ee3
PNA		 3514static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3515 const struct nlattr * const nla[])
96518518 3516{
7dab8ee3 3517 struct nftables_pernet *nft_net = nft_pernet(info->net);
7dab8ee3
PNA		 3518 struct netlink_ext_ack *extack = info->extack;
3519 unsigned int size, i, n, ulen = 0, usize = 0;
3520 u8 genmask = nft_genmask_next(info->net);
3521 struct nft_rule *rule, *old_rule = NULL;
3522 struct nft_expr_info *expr_info = NULL;
ef4b65e5 3523 u8 family = info->nfmsg->nfgen_family;
3c5e4462 3524 struct nft_flow_rule *flow = NULL;
7dab8ee3 3525 struct net *net = info->net;
7dab8ee3 3526 struct nft_userdata *udata;
96518518
PM		 3527 struct nft_table *table;
3528 struct nft_chain *chain;
7dab8ee3
PNA		 3529 struct nft_trans *trans;
3530 u64 handle, pos_handle;
96518518
PM		 3531 struct nft_expr *expr;
3532 struct nft_ctx ctx;
3533 struct nlattr *tmp;
96518518 3534 int err, rem;
96518518 3535
0854db2a 3536 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b 3537
6001a930
PNA		 3538 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3539 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 3540 if (IS_ERR(table)) {
3541 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3542 return PTR_ERR(table);
36dd1bcc 3543 }
96518518 3544
837830a4
PNA		 3545 if (nla[NFTA_RULE_CHAIN]) {
3546 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3547 genmask);
3548 if (IS_ERR(chain)) {
3549 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3550 return PTR_ERR(chain);
3551 }
d0e2c7de
PNA		 3552 if (nft_chain_is_bound(chain))
3553 return -EOPNOTSUPP;
3554
837830a4 3555 } else if (nla[NFTA_RULE_CHAIN_ID]) {
95f466d2 3556 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
837830a4
PNA		 3557 if (IS_ERR(chain)) {
3558 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3559 return PTR_ERR(chain);
3560 }
3561 } else {
3562 return -EINVAL;
36dd1bcc 3563 }
96518518
PM		 3564
3565 if (nla[NFTA_RULE_HANDLE]) {
3566 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 3567 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 3568 if (IS_ERR(rule)) {
3569 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3570 return PTR_ERR(rule);
36dd1bcc 3571 }
96518518 3572
7dab8ee3 3573 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 3574 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3575 return -EEXIST;
36dd1bcc 3576 }
7dab8ee3 3577 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3578 old_rule = rule;
3579 else
3580 return -EOPNOTSUPP;
3581 } else {
7dab8ee3
PNA		 3582 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3583 info->nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3584 return -EINVAL;
3585 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 3586
3587 if (chain->use == UINT_MAX)
3588 return -EOVERFLOW;
5e948466 3589
447750f2
FW		 3590 if (nla[NFTA_RULE_POSITION]) {
3591 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3592 old_rule = __nft_rule_lookup(chain, pos_handle);
3593 if (IS_ERR(old_rule)) {
3594 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3595 return PTR_ERR(old_rule);
3596 }
75dd48e2 3597 } else if (nla[NFTA_RULE_POSITION_ID]) {
36d5b291 3598 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
75dd48e2
PS		 3599 if (IS_ERR(old_rule)) {
3600 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3601 return PTR_ERR(old_rule);
3602 }
36dd1bcc 3603 }
5e948466
EL		 3604 }
3605
7dab8ee3 3606 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
0ca743a5 3607
96518518
PM		 3608 n = 0;
3609 size = 0;
3610 if (nla[NFTA_RULE_EXPRESSIONS]) {
7dab8ee3
PNA		 3611 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3612 sizeof(struct nft_expr_info),
3613 GFP_KERNEL);
3614 if (!expr_info)
2a43ecf9
FW		 3615 return -ENOMEM;
3616
96518518
PM		 3617 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3618 err = -EINVAL;
3619 if (nla_type(tmp) != NFTA_LIST_ELEM)
3c5e4462 3620 goto err_release_expr;
96518518 3621 if (n == NFT_RULE_MAXEXPRS)
3c5e4462 3622 goto err_release_expr;
7dab8ee3 3623 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
c781471d
PNA		 3624 if (err < 0) {
3625 NL_SET_BAD_ATTR(extack, tmp);
3c5e4462 3626 goto err_release_expr;
c781471d 3627 }
7dab8ee3 3628 size += expr_info[n].ops->size;
96518518
PM		 3629 n++;
3630 }
3631 }
9889840f
PM		 3632 /* Check for overflow of dlen field */
3633 err = -EFBIG;
3634 if (size >= 1 << 12)
3c5e4462 3635 goto err_release_expr;
96518518 3636
86f1ec32 3637 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 3638 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 3639 if (ulen > 0)
3640 usize = sizeof(struct nft_userdata) + ulen;
3641 }
0768b3b3 3642
96518518 3643 err = -ENOMEM;
33758c89 3644 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
96518518 3645 if (rule == NULL)
3c5e4462 3646 goto err_release_expr;
96518518 3647
889f7ee7 3648 nft_activate_next(net, rule);
0628b123 3649
96518518
PM		 3650 rule->handle = handle;
3651 rule->dlen = size;
86f1ec32 3652 rule->udata = ulen ? 1 : 0;
0768b3b3 3653
86f1ec32
PM		 3654 if (ulen) {
3655 udata = nft_userdata(rule);
3656 udata->len = ulen - 1;
3657 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3658 }
96518518 3659
96518518
PM		 3660 expr = nft_expr_first(rule);
3661 for (i = 0; i < n; i++) {
7dab8ee3 3662 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
83d9dcba 3663 if (err < 0) {
7dab8ee3 3664 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3c5e4462 3665 goto err_release_rule;
83d9dcba 3666 }
a654de8f 3667
7dab8ee3 3668 if (expr_info[i].ops->validate)
a654de8f
PNA		 3669 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3670
7dab8ee3 3671 expr_info[i].ops = NULL;
96518518
PM		 3672 expr = nft_expr_next(expr);
3673 }
3674
3c5e4462
PNA		 3675 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3676 flow = nft_flow_rule_create(net, rule);
3677 if (IS_ERR(flow)) {
3678 err = PTR_ERR(flow);
3679 goto err_release_rule;
3680 }
3681 }
3682
7dab8ee3 3683 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
2c964c55
PNA		 3684 err = nft_delrule(&ctx, old_rule);
3685 if (err < 0)
3686 goto err_destroy_flow_rule;
3687
ca089878 3688 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
569ccae6
FW		 3689 if (trans == NULL) {
3690 err = -ENOMEM;
3c5e4462 3691 goto err_destroy_flow_rule;
569ccae6 3692 }
569ccae6
FW		 3693 list_add_tail_rcu(&rule->list, &old_rule->list);
3694 } else {
c9626a2c
PNA		 3695 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3696 if (!trans) {
569ccae6 3697 err = -ENOMEM;
3c5e4462 3698 goto err_destroy_flow_rule;
569ccae6
FW		 3699 }
3700
7dab8ee3 3701 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
569ccae6
FW		 3702 if (old_rule)
3703 list_add_rcu(&rule->list, &old_rule->list);
3704 else
3705 list_add_tail_rcu(&rule->list, &chain->rules);
3706 } else {
3707 if (old_rule)
3708 list_add_tail_rcu(&rule->list, &old_rule->list);
3709 else
3710 list_add_rcu(&rule->list, &chain->rules);
3711 }
0628b123 3712 }
7dab8ee3 3713 kvfree(expr_info);
4fefee57 3714 chain->use++;
96518518 3715
3c5e4462
PNA		 3716 if (flow)
3717 nft_trans_flow_rule(trans) = flow;
3718
0854db2a 3719 if (nft_net->validate_state == NFT_VALIDATE_DO)
a654de8f
PNA		 3720 return nft_table_validate(net, table);
3721
3722 return 0;
3c5e4462
PNA		 3723
3724err_destroy_flow_rule:
4ca041f9
CIK		 3725 if (flow)
3726 nft_flow_rule_destroy(flow);
3c5e4462 3727err_release_rule:
bb7b40ae 3728 nf_tables_rule_release(&ctx, rule);
3c5e4462 3729err_release_expr:
96518518 3730 for (i = 0; i < n; i++) {
7dab8ee3
PNA		 3731 if (expr_info[i].ops) {
3732 module_put(expr_info[i].ops->type->owner);
3733 if (expr_info[i].ops->type->release_ops)
3734 expr_info[i].ops->type->release_ops(expr_info[i].ops);
b25a31bf 3735 }
96518518 3736 }
7dab8ee3
PNA		 3737 kvfree(expr_info);
3738
96518518
PM		 3739 return err;
3740}
3741
1a94e38d 3742static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
36d5b291 3743 const struct nft_chain *chain,
1a94e38d
PNA		 3744 const struct nlattr *nla)
3745{
d59d2f82 3746 struct nftables_pernet *nft_net = nft_pernet(net);
1a94e38d
PNA		 3747 u32 id = ntohl(nla_get_be32(nla));
3748 struct nft_trans *trans;
3749
0854db2a 3750 list_for_each_entry(trans, &nft_net->commit_list, list) {
1a94e38d
PNA		 3751 struct nft_rule *rule = nft_trans_rule(trans);
3752
3753 if (trans->msg_type == NFT_MSG_NEWRULE &&
36d5b291 3754 trans->ctx.chain == chain &&
1a94e38d
PNA		 3755 id == nft_trans_rule_id(trans))
3756 return rule;
3757 }
3758 return ERR_PTR(-ENOENT);
3759}
3760
7dab8ee3
PNA		 3761static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3762 const struct nlattr * const nla[])
96518518 3763{
7dab8ee3 3764 struct netlink_ext_ack *extack = info->extack;
7dab8ee3 3765 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 3766 u8 family = info->nfmsg->nfgen_family;
cf9dc09d 3767 struct nft_chain *chain = NULL;
7dab8ee3
PNA		 3768 struct net *net = info->net;
3769 struct nft_table *table;
cf9dc09d 3770 struct nft_rule *rule;
0628b123 3771 struct nft_ctx ctx;
ef4b65e5 3772 int err = 0;
96518518 3773
6001a930
PNA		 3774 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3775 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 3776 if (IS_ERR(table)) {
3777 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3778 return PTR_ERR(table);
36dd1bcc 3779 }
96518518 3780
cf9dc09d 3781 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 3782 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3783 genmask);
36dd1bcc 3784 if (IS_ERR(chain)) {
1fb7696a 3785 if (PTR_ERR(chain) == -ENOENT &&
f80a612d
FFM		 3786 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3787 return 0;
3788
36dd1bcc 3789 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 3790 return PTR_ERR(chain);
36dd1bcc 3791 }
d0e2c7de
PNA		 3792 if (nft_chain_is_bound(chain))
3793 return -EOPNOTSUPP;
cf9dc09d 3794 }
96518518 3795
7dab8ee3 3796 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
0628b123 3797
cf9dc09d
PNA		 3798 if (chain) {
3799 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 3800 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc 3801 if (IS_ERR(rule)) {
f80a612d
FFM		 3802 if (PTR_ERR(rule) == -ENOENT &&
3803 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3804 return 0;
3805
36dd1bcc 3806 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 3807 return PTR_ERR(rule);
36dd1bcc 3808 }
96518518 3809
1a94e38d
PNA		 3810 err = nft_delrule(&ctx, rule);
3811 } else if (nla[NFTA_RULE_ID]) {
36d5b291 3812 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 3813 if (IS_ERR(rule)) {
3814 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 3815 return PTR_ERR(rule);
36dd1bcc 3816 }
1a94e38d 3817
5e266fe7 3818 err = nft_delrule(&ctx, rule);
cf9dc09d 3819 } else {
ce24b721 3820 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 3821 }
3822 } else {
3823 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 3824 if (!nft_is_active_next(net, chain))
3825 continue;
3826
cf9dc09d 3827 ctx.chain = chain;
ce24b721 3828 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 3829 if (err < 0)
3830 break;
3831 }
3832 }
3833
3834 return err;
3835}
3836
20a69341
PM		 3837/*
3838 * Sets
3839 */
e32a4dc6
FW		 3840static const struct nft_set_type *nft_set_types[] = {
3841 &nft_set_hash_fast_type,
3842 &nft_set_hash_type,
3843 &nft_set_rhash_type,
3844 &nft_set_bitmap_type,
3845 &nft_set_rbtree_type,
e6abef61 3846#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
7400b063
SB		 3847 &nft_set_pipapo_avx2_type,
3848#endif
e32a4dc6
FW		 3849 &nft_set_pipapo_type,
3850};
20a69341 3851
2b664957 3852#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 3853 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3854 NFT_SET_EVAL)
2b664957 3855
71cc0873 3856static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 3857{
71cc0873 3858 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 3859}
3860
c50b960c
PM		 3861/*
3862 * Select a set implementation based on the data characteristics and the
3863 * given policy. The total memory use might not be known if no size is
3864 * given, in that case the amount of memory per element is used.
3865 */
3866static const struct nft_set_ops *
2b664957
PNA		 3867nft_select_set_ops(const struct nft_ctx *ctx,
3868 const struct nlattr * const nla[],
bed4a63e 3869 const struct nft_set_desc *desc)
20a69341 3870{
d59d2f82 3871 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
c50b960c
PM		 3872 const struct nft_set_ops *ops, *bops;
3873 struct nft_set_estimate est, best;
2b664957
PNA		 3874 const struct nft_set_type *type;
3875 u32 flags = 0;
e32a4dc6 3876 int i;
20a69341 3877
0854db2a 3878 lockdep_assert_held(&nft_net->commit_mutex);
f102d66b 3879 lockdep_nfnl_nft_mutex_not_held();
e32a4dc6 3880
2b664957
PNA		 3881 if (nla[NFTA_SET_FLAGS] != NULL)
3882 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 3883
55af753c
PNA		 3884 bops = NULL;
3885 best.size = ~0;
3886 best.lookup = ~0;
0b5a7874 3887 best.space = ~0;
c50b960c 3888
e32a4dc6
FW		 3889 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3890 type = nft_set_types[i];
71cc0873 3891 ops = &type->ops;
2b664957 3892
71cc0873 3893 if (!nft_set_ops_candidate(type, flags))
20a69341 3894 continue;
2b664957 3895 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 3896 continue;
3897
bed4a63e 3898 switch (desc->policy) {
c50b960c 3899 case NFT_SET_POL_PERFORMANCE:
55af753c 3900 if (est.lookup < best.lookup)
c50b960c 3901 break;
644e334e
PNA		 3902 if (est.lookup == best.lookup &&
3903 est.space < best.space)
3904 break;
c50b960c
PM		 3905 continue;
3906 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 3907 if (!desc->size) {
3908 if (est.space < best.space)
3909 break;
3910 if (est.space == best.space &&
3911 est.lookup < best.lookup)
3912 break;
4f2921ca 3913 } else if (est.size < best.size || !bops) {
c50b960c 3914 break;
0b5a7874 3915 }
c50b960c
PM		 3916 continue;
3917 default:
3918 break;
3919 }
3920
c50b960c
PM		 3921 bops = ops;
3922 best = est;
20a69341
PM		 3923 }
3924
c50b960c
PM		 3925 if (bops != NULL)
3926 return bops;
3927
20a69341
PM		 3928 return ERR_PTR(-EOPNOTSUPP);
3929}
3930
3931static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 3932 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3933 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 3934 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 3935 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 3936 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3937 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3938 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3939 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3940 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 3941 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3942 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 3943 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 3944 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3945 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 3946 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3947 .len = NFT_USERDATA_MAXLEN },
8aeff920 3948 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 3949 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
65038428 3950 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
48b0ae04 3951 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
c50b960c
PM		 3952};
3953
3954static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3955 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
f3a2181e 3956 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
20a69341
PM		 3957};
3958
cac20fcd
PNA		 3959static struct nft_set *nft_set_lookup(const struct nft_table *table,
3960 const struct nlattr *nla, u8 genmask)
20a69341
PM		 3961{
3962 struct nft_set *set;
3963
3964 if (nla == NULL)
3965 return ERR_PTR(-EINVAL);
3966
d9adf22a 3967 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 3968 if (!nla_strcmp(nla, set->name) &&
3969 nft_active_genmask(set, genmask))
20a69341
PM		 3970 return set;
3971 }
3972 return ERR_PTR(-ENOENT);
3973}
3974
cac20fcd
PNA		 3975static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3976 const struct nlattr *nla,
3977 u8 genmask)
3ecbfd65
HS		 3978{
3979 struct nft_set *set;
3980
3ecbfd65
HS		 3981 list_for_each_entry(set, &table->sets, list) {
3982 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3983 nft_active_genmask(set, genmask))
3984 return set;
3985 }
3986 return ERR_PTR(-ENOENT);
3987}
3988
cac20fcd 3989static struct nft_set *nft_set_lookup_byid(const struct net *net,
470ee20e 3990 const struct nft_table *table,
cac20fcd 3991 const struct nlattr *nla, u8 genmask)
958bee14 3992{
d59d2f82 3993 struct nftables_pernet *nft_net = nft_pernet(net);
958bee14 3994 u32 id = ntohl(nla_get_be32(nla));
d59d2f82 3995 struct nft_trans *trans;
958bee14 3996
0854db2a 3997 list_for_each_entry(trans, &nft_net->commit_list, list) {
9c7f96fd
AK		 3998 if (trans->msg_type == NFT_MSG_NEWSET) {
3999 struct nft_set *set = nft_trans_set(trans);
37a9cc52 4000
9c7f96fd 4001 if (id == nft_trans_set_id(trans) &&
470ee20e 4002 set->table == table &&
9c7f96fd
AK		 4003 nft_active_genmask(set, genmask))
4004 return set;
4005 }
958bee14
PNA		 4006 }
4007 return ERR_PTR(-ENOENT);
4008}
c7a72e3f 4009
10659cba
PNA		 4010struct nft_set *nft_set_lookup_global(const struct net *net,
4011 const struct nft_table *table,
4012 const struct nlattr *nla_set_name,
4013 const struct nlattr *nla_set_id,
4014 u8 genmask)
c7a72e3f
PNA		 4015{
4016 struct nft_set *set;
4017
cac20fcd 4018 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 4019 if (IS_ERR(set)) {
4020 if (!nla_set_id)
4021 return set;
4022
470ee20e 4023 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
c7a72e3f
PNA		 4024 }
4025 return set;
4026}
10659cba 4027EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 4028
20a69341
PM		 4029static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4030 const char *name)
4031{
4032 const struct nft_set *i;
4033 const char *p;
4034 unsigned long *inuse;
60eb1894 4035 unsigned int n = 0, min = 0;
20a69341 4036
38745490 4037 p = strchr(name, '%');
20a69341
PM		 4038 if (p != NULL) {
4039 if (p[1] != 'd' || strchr(p + 2, '%'))
4040 return -EINVAL;
4041
4042 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4043 if (inuse == NULL)
4044 return -ENOMEM;
60eb1894 4045cont:
20a69341 4046 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 4047 int tmp;
4048
271c5ca8 4049 if (!nft_is_active_next(ctx->net, i))
37a9cc52 4050 continue;
14662917 4051 if (!sscanf(i->name, name, &tmp))
20a69341 4052 continue;
60eb1894 4053 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 4054 continue;
14662917 4055
60eb1894 4056 set_bit(tmp - min, inuse);
20a69341
PM		 4057 }
4058
53b70287 4059 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 4060 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4061 min += BITS_PER_BYTE * PAGE_SIZE;
4062 memset(inuse, 0, PAGE_SIZE);
4063 goto cont;
4064 }
20a69341
PM		 4065 free_page((unsigned long)inuse);
4066 }
4067
33758c89 4068 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
38745490
PS		 4069 if (!set->name)
4070 return -ENOMEM;
4071
20a69341 4072 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 4073 if (!nft_is_active_next(ctx->net, i))
4074 continue;
e63aaaa6
AY		 4075 if (!strcmp(set->name, i->name)) {
4076 kfree(set->name);
7fb6f78d 4077 set->name = NULL;
20a69341 4078 return -ENFILE;
e63aaaa6 4079 }
20a69341
PM		 4080 }
4081 return 0;
4082}
4083
917d80d3 4084int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
8e1102d5
FW		 4085{
4086 u64 ms = be64_to_cpu(nla_get_be64(nla));
4087 u64 max = (u64)(~((u64)0));
4088
4089 max = div_u64(max, NSEC_PER_MSEC);
4090 if (ms >= max)
4091 return -ERANGE;
4092
4093 ms *= NSEC_PER_MSEC;
4094 *result = nsecs_to_jiffies64(ms);
4095 return 0;
4096}
4097
917d80d3 4098__be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5 4099{
3b15d09f 4100 return cpu_to_be64(jiffies64_to_msecs(input));
8e1102d5
FW		 4101}
4102
f3a2181e
SB		 4103static int nf_tables_fill_set_concat(struct sk_buff *skb,
4104 const struct nft_set *set)
4105{
4106 struct nlattr *concat, *field;
4107 int i;
4108
4109 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4110 if (!concat)
4111 return -ENOMEM;
4112
4113 for (i = 0; i < set->field_count; i++) {
4114 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4115 if (!field)
4116 return -ENOMEM;
4117
4118 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4119 htonl(set->field_len[i])))
4120 return -ENOMEM;
4121
4122 nla_nest_end(skb, field);
4123 }
4124
4125 nla_nest_end(skb, concat);
4126
4127 return 0;
4128}
4129
20a69341
PM		 4130static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4131 const struct nft_set *set, u16 event, u16 flags)
4132{
123b9961
PNA		 4133 u64 timeout = READ_ONCE(set->timeout);
4134 u32 gc_int = READ_ONCE(set->gc_int);
128ad332 4135 u32 portid = ctx->portid;
123b9961 4136 struct nlmsghdr *nlh;
65038428 4137 struct nlattr *nest;
128ad332 4138 u32 seq = ctx->seq;
48b0ae04 4139 int i;
20a69341 4140
dedb67c4 4141 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 4142 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4143 NFNETLINK_V0, nft_base_seq(ctx->net));
4144 if (!nlh)
20a69341
PM		 4145 goto nla_put_failure;
4146
20a69341
PM		 4147 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4148 goto nla_put_failure;
4149 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4150 goto nla_put_failure;
3ecbfd65
HS		 4151 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4152 NFTA_SET_PAD))
4153 goto nla_put_failure;
20a69341
PM		 4154 if (set->flags != 0)
4155 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4156 goto nla_put_failure;
4157
4158 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4159 goto nla_put_failure;
4160 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4161 goto nla_put_failure;
4162 if (set->flags & NFT_SET_MAP) {
4163 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4164 goto nla_put_failure;
4165 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4166 goto nla_put_failure;
4167 }
8aeff920
PNA		 4168 if (set->flags & NFT_SET_OBJECT &&
4169 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4170 goto nla_put_failure;
20a69341 4171
123b9961 4172 if (timeout &&
d3e2a111 4173 nla_put_be64(skb, NFTA_SET_TIMEOUT,
123b9961 4174 nf_jiffies64_to_msecs(timeout),
b46f6ded 4175 NFTA_SET_PAD))
761da293 4176 goto nla_put_failure;
123b9961
PNA		 4177 if (gc_int &&
4178 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
761da293
PM		 4179 goto nla_put_failure;
4180
9363dc4b
AB		 4181 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4182 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4183 goto nla_put_failure;
4184 }
4185
6f03bf43
PNA		 4186 if (set->udata &&
4187 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
e6d8ecac
CFG		 4188 goto nla_put_failure;
4189
65038428
PNA		 4190 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4191 if (!nest)
c50b960c
PM		 4192 goto nla_put_failure;
4193 if (set->size &&
4194 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4195 goto nla_put_failure;
f3a2181e
SB		 4196
4197 if (set->field_count > 1 &&
4198 nf_tables_fill_set_concat(skb, set))
4199 goto nla_put_failure;
4200
65038428
PNA		 4201 nla_nest_end(skb, nest);
4202
8cfd9b0f 4203 if (set->num_exprs == 1) {
65038428 4204 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
8daa8fde 4205 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
65038428
PNA		 4206 goto nla_put_failure;
4207
4208 nla_nest_end(skb, nest);
48b0ae04
PNA		 4209 } else if (set->num_exprs > 1) {
4210 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4211 if (nest == NULL)
65038428
PNA		 4212 goto nla_put_failure;
4213
48b0ae04
PNA		 4214 for (i = 0; i < set->num_exprs; i++) {
4215 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
8daa8fde 4216 set->exprs[i], false) < 0)
48b0ae04
PNA		 4217 goto nla_put_failure;
4218 }
65038428
PNA		 4219 nla_nest_end(skb, nest);
4220 }
c50b960c 4221
053c095a
JB		 4222 nlmsg_end(skb, nlh);
4223 return 0;
20a69341
PM		 4224
4225nla_put_failure:
4226 nlmsg_trim(skb, nlh);
4227 return -1;
4228}
4229
25e94a99
PNA		 4230static void nf_tables_set_notify(const struct nft_ctx *ctx,
4231 const struct nft_set *set, int event,
4232 gfp_t gfp_flags)
20a69341 4233{
d59d2f82 4234 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
128ad332 4235 u32 portid = ctx->portid;
6fb721cf
PNA		 4236 struct sk_buff *skb;
4237 u16 flags = 0;
20a69341
PM		 4238 int err;
4239
128ad332
PNA		 4240 if (!ctx->report &&
4241 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 4242 return;
20a69341 4243
31f8441c 4244 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 4245 if (skb == NULL)
4246 goto err;
4247
6fb721cf
PNA		 4248 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4249 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4250
4251 err = nf_tables_fill_set(skb, ctx, set, event, flags);
20a69341
PM		 4252 if (err < 0) {
4253 kfree_skb(skb);
4254 goto err;
4255 }
4256
0854db2a 4257 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 4258 return;
20a69341 4259err:
25e94a99 4260 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 4261}
4262
5b96af77 4263static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 4264{
4265 const struct nft_set *set;
4266 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 4267 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4268 struct net *net = sock_net(skb->sk);
5b96af77 4269 struct nft_ctx *ctx = cb->data, ctx_set;
0854db2a 4270 struct nftables_pernet *nft_net;
c9c8e485
PNA		 4271
4272 if (cb->args[1])
4273 return skb->len;
4274
e688a7f8 4275 rcu_read_lock();
d59d2f82 4276 nft_net = nft_pernet(net);
34002783 4277 cb->seq = READ_ONCE(nft_net->base_seq);
38e029f1 4278
0854db2a 4279 list_for_each_entry_rcu(table, &nft_net->tables, list) {
36596dad 4280 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 4281 ctx->family != table->family)
36596dad
PNA		 4282 continue;
4283
4284 if (ctx->table && ctx->table != table)
5b96af77
PNA		 4285 continue;
4286
36596dad
PNA		 4287 if (cur_table) {
4288 if (cur_table != table)
c9c8e485
PNA		 4289 continue;
4290
36596dad 4291 cur_table = NULL;
c9c8e485 4292 }
36596dad
PNA		 4293 idx = 0;
4294 list_for_each_entry_rcu(set, &table->sets, list) {
4295 if (idx < s_idx)
4296 goto cont;
4297 if (!nft_is_active(net, set))
4298 goto cont;
5b96af77 4299
36596dad
PNA		 4300 ctx_set = *ctx;
4301 ctx_set.table = table;
98319cb9 4302 ctx_set.family = table->family;
c9c8e485 4303
36596dad
PNA		 4304 if (nf_tables_fill_set(skb, &ctx_set, set,
4305 NFT_MSG_NEWSET,
4306 NLM_F_MULTI) < 0) {
4307 cb->args[0] = idx;
4308 cb->args[2] = (unsigned long) table;
4309 goto done;
c9c8e485 4310 }
36596dad 4311 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 4312cont:
36596dad 4313 idx++;
c9c8e485 4314 }
36596dad
PNA		 4315 if (s_idx)
4316 s_idx = 0;
c9c8e485
PNA		 4317 }
4318 cb->args[1] = 1;
4319done:
e688a7f8 4320 rcu_read_unlock();
c9c8e485
PNA		 4321 return skb->len;
4322}
4323
90fd131a
FW		 4324static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4325{
4326 struct nft_ctx *ctx_dump = NULL;
4327
4328 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4329 if (ctx_dump == NULL)
4330 return -ENOMEM;
4331
4332 cb->data = ctx_dump;
4333 return 0;
4334}
4335
5b96af77 4336static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 4337{
5b96af77
PNA		 4338 kfree(cb->data);
4339 return 0;
20a69341
PM		 4340}
4341
d9adf22a 4342/* called with rcu_read_lock held */
797d4980
PNA		 4343static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4344 const struct nlattr * const nla[])
20a69341 4345{
797d4980
PNA		 4346 struct netlink_ext_ack *extack = info->extack;
4347 u8 genmask = nft_genmask_cur(info->net);
67086651
PNA		 4348 u8 family = info->nfmsg->nfgen_family;
4349 struct nft_table *table = NULL;
797d4980 4350 struct net *net = info->net;
20a69341 4351 const struct nft_set *set;
20a69341 4352 struct sk_buff *skb2;
797d4980 4353 struct nft_ctx ctx;
20a69341
PM		 4354 int err;
4355
67086651
PNA		 4356 if (nla[NFTA_SET_TABLE]) {
4357 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4358 genmask, 0);
4359 if (IS_ERR(table)) {
4360 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4361 return PTR_ERR(table);
4362 }
4363 }
4364
4365 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
20a69341 4366
797d4980 4367 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
20a69341 4368 struct netlink_dump_control c = {
90fd131a 4369 .start = nf_tables_dump_sets_start,
20a69341 4370 .dump = nf_tables_dump_sets,
5b96af77 4371 .done = nf_tables_dump_sets_done,
90fd131a 4372 .data = &ctx,
d9adf22a 4373 .module = THIS_MODULE,
20a69341 4374 };
5b96af77 4375
797d4980 4376 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
20a69341
PM		 4377 }
4378
c9c8e485 4379 /* Only accept unspec with dump */
ef4b65e5 4380 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
c9c8e485 4381 return -EAFNOSUPPORT;
eaa2bcd6
PT		 4382 if (!nla[NFTA_SET_TABLE])
4383 return -EINVAL;
c9c8e485 4384
67086651 4385 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 4386 if (IS_ERR(set))
4387 return PTR_ERR(set);
4388
d9adf22a 4389 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 4390 if (skb2 == NULL)
4391 return -ENOMEM;
4392
4393 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4394 if (err < 0)
ee921183 4395 goto err_fill_set_info;
20a69341 4396
ee921183 4397 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
20a69341 4398
ee921183 4399err_fill_set_info:
20a69341
PM		 4400 kfree_skb(skb2);
4401 return err;
4402}
4403
f3a2181e
SB		 4404static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4405 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4406};
4407
4408static int nft_set_desc_concat_parse(const struct nlattr *attr,
4409 struct nft_set_desc *desc)
4410{
4411 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4412 u32 len;
4413 int err;
4414
fecf31ee
PNA		 4415 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4416 return -E2BIG;
4417
f3a2181e
SB		 4418 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4419 nft_concat_policy, NULL);
4420 if (err < 0)
4421 return err;
4422
4423 if (!tb[NFTA_SET_FIELD_LEN])
4424 return -EINVAL;
4425
4426 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
fecf31ee
PNA		 4427 if (!len || len > U8_MAX)
4428 return -EINVAL;
f3a2181e
SB		 4429
4430 desc->field_len[desc->field_count++] = len;
4431
4432 return 0;
4433}
4434
4435static int nft_set_desc_concat(struct nft_set_desc *desc,
4436 const struct nlattr *nla)
4437{
4438 struct nlattr *attr;
fecf31ee
PNA		 4439 u32 num_regs = 0;
4440 int rem, err, i;
f3a2181e
SB		 4441
4442 nla_for_each_nested(attr, nla, rem) {
4443 if (nla_type(attr) != NFTA_LIST_ELEM)
4444 return -EINVAL;
4445
4446 err = nft_set_desc_concat_parse(attr, desc);
4447 if (err < 0)
4448 return err;
4449 }
4450
fecf31ee
PNA		 4451 for (i = 0; i < desc->field_count; i++)
4452 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4453
4454 if (num_regs > NFT_REG32_COUNT)
4455 return -E2BIG;
4456
f3a2181e
SB		 4457 return 0;
4458}
4459
f7e840ee 4460static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
c50b960c
PM		 4461 const struct nlattr *nla)
4462{
4463 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4464 int err;
4465
8cb08174
JB		 4466 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4467 nft_set_desc_policy, NULL);
c50b960c
PM		 4468 if (err < 0)
4469 return err;
4470
4471 if (da[NFTA_SET_DESC_SIZE] != NULL)
4472 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
f3a2181e
SB		 4473 if (da[NFTA_SET_DESC_CONCAT])
4474 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
c50b960c 4475
f3a2181e 4476 return err;
c50b960c
PM		 4477}
4478
a8fe4154
PNA		 4479static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4480 const struct nlattr * const *nla,
4481 struct nft_expr **exprs, int *num_exprs,
4482 u32 flags)
4483{
4484 struct nft_expr *expr;
4485 int err, i;
4486
4487 if (nla[NFTA_SET_EXPR]) {
4488 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4489 if (IS_ERR(expr)) {
4490 err = PTR_ERR(expr);
4491 goto err_set_expr_alloc;
4492 }
4493 exprs[0] = expr;
4494 (*num_exprs)++;
4495 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4496 struct nlattr *tmp;
4497 int left;
4498
4499 if (!(flags & NFT_SET_EXPR)) {
4500 err = -EINVAL;
4501 goto err_set_expr_alloc;
4502 }
4503 i = 0;
4504 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4505 if (i == NFT_SET_EXPR_MAX) {
4506 err = -E2BIG;
4507 goto err_set_expr_alloc;
4508 }
4509 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4510 err = -EINVAL;
4511 goto err_set_expr_alloc;
4512 }
4513 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4514 if (IS_ERR(expr)) {
4515 err = PTR_ERR(expr);
4516 goto err_set_expr_alloc;
4517 }
4518 exprs[i++] = expr;
4519 (*num_exprs)++;
4520 }
4521 }
4522
4523 return 0;
4524
4525err_set_expr_alloc:
4526 for (i = 0; i < *num_exprs; i++)
4527 nft_expr_destroy(ctx, exprs[i]);
4528
4529 return err;
4530}
4531
f6594c37
PNA		 4532static bool nft_set_is_same(const struct nft_set *set,
4533 const struct nft_set_desc *desc,
4534 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4535{
4536 int i;
4537
4538 if (set->ktype != desc->ktype ||
4539 set->dtype != desc->dtype ||
4540 set->flags != flags ||
4541 set->klen != desc->klen ||
4542 set->dlen != desc->dlen ||
4543 set->field_count != desc->field_count ||
4544 set->num_exprs != num_exprs)
4545 return false;
4546
4547 for (i = 0; i < desc->field_count; i++) {
4548 if (set->field_len[i] != desc->field_len[i])
4549 return false;
4550 }
4551
4552 for (i = 0; i < num_exprs; i++) {
4553 if (set->exprs[i]->ops != exprs[i]->ops)
4554 return false;
4555 }
4556
4557 return true;
4558}
4559
7dab8ee3
PNA		 4560static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4561 const struct nlattr * const nla[])
20a69341 4562{
7dab8ee3
PNA		 4563 struct netlink_ext_ack *extack = info->extack;
4564 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 4565 u8 family = info->nfmsg->nfgen_family;
20a69341 4566 const struct nft_set_ops *ops;
7dab8ee3
PNA		 4567 struct net *net = info->net;
4568 struct nft_set_desc desc;
20a69341 4569 struct nft_table *table;
7dab8ee3 4570 unsigned char *udata;
20a69341
PM		 4571 struct nft_set *set;
4572 struct nft_ctx ctx;
6c8774a9 4573 size_t alloc_size;
a8fe4154 4574 int num_exprs = 0;
7dab8ee3
PNA		 4575 char *name;
4576 int err, i;
e6d8ecac 4577 u16 udlen;
bed4a63e 4578 u32 flags;
7dab8ee3 4579 u64 size;
20a69341
PM		 4580
4581 if (nla[NFTA_SET_TABLE] == NULL ||
4582 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 4583 nla[NFTA_SET_KEY_LEN] == NULL ||
4584 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 4585 return -EINVAL;
4586
c50b960c
PM		 4587 memset(&desc, 0, sizeof(desc));
4588
bed4a63e 4589 desc.ktype = NFT_DATA_VALUE;
20a69341 4590 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
bed4a63e
PNA		 4591 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4592 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
20a69341
PM		 4593 return -EINVAL;
4594 }
4595
c50b960c 4596 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 4597 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4598 return -EINVAL;
4599
4600 flags = 0;
4601 if (nla[NFTA_SET_FLAGS] != NULL) {
4602 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4603 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 4604 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920 4605 NFT_SET_MAP | NFT_SET_EVAL |
b4e70d8d 4606 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
d9583cdf 4607 return -EOPNOTSUPP;
8aeff920 4608 /* Only one of these operations is supported */
acab7131
FW		 4609 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4610 (NFT_SET_MAP | NFT_SET_OBJECT))
4611 return -EOPNOTSUPP;
4612 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4613 (NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 4614 return -EOPNOTSUPP;
20a69341
PM		 4615 }
4616
bed4a63e 4617 desc.dtype = 0;
20a69341
PM		 4618 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4619 if (!(flags & NFT_SET_MAP))
4620 return -EINVAL;
4621
bed4a63e
PNA		 4622 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4623 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4624 desc.dtype != NFT_DATA_VERDICT)
20a69341
PM		 4625 return -EINVAL;
4626
bed4a63e 4627 if (desc.dtype != NFT_DATA_VERDICT) {
20a69341
PM		 4628 if (nla[NFTA_SET_DATA_LEN] == NULL)
4629 return -EINVAL;
c50b960c 4630 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 4631 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4632 return -EINVAL;
4633 } else
7d740264 4634 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 4635 } else if (flags & NFT_SET_MAP)
4636 return -EINVAL;
4637
8aeff920
PNA		 4638 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4639 if (!(flags & NFT_SET_OBJECT))
4640 return -EINVAL;
4641
bed4a63e
PNA		 4642 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4643 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4644 desc.objtype > NFT_OBJECT_MAX)
d9583cdf 4645 return -EOPNOTSUPP;
8aeff920
PNA		 4646 } else if (flags & NFT_SET_OBJECT)
4647 return -EINVAL;
4648 else
bed4a63e 4649 desc.objtype = NFT_OBJECT_UNSPEC;
8aeff920 4650
bed4a63e 4651 desc.timeout = 0;
761da293
PM		 4652 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4653 if (!(flags & NFT_SET_TIMEOUT))
4654 return -EINVAL;
8e1102d5 4655
bed4a63e 4656 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
8e1102d5
FW		 4657 if (err)
4658 return err;
761da293 4659 }
bed4a63e 4660 desc.gc_int = 0;
761da293
PM		 4661 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4662 if (!(flags & NFT_SET_TIMEOUT))
4663 return -EINVAL;
bed4a63e 4664 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
761da293
PM		 4665 }
4666
bed4a63e 4667 desc.policy = NFT_SET_POL_PERFORMANCE;
c50b960c 4668 if (nla[NFTA_SET_POLICY] != NULL)
bed4a63e 4669 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
c50b960c
PM		 4670
4671 if (nla[NFTA_SET_DESC] != NULL) {
f7e840ee 4672 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
c50b960c
PM		 4673 if (err < 0)
4674 return err;
1b6345d4
PNA		 4675
4676 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4677 return -EINVAL;
4678 } else if (flags & NFT_SET_CONCAT) {
4679 return -EINVAL;
c50b960c
PM		 4680 }
4681
48b0ae04 4682 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
d56aab26
PNA		 4683 desc.expr = true;
4684
6001a930
PNA		 4685 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4686 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 4687 if (IS_ERR(table)) {
4688 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 4689 return PTR_ERR(table);
36dd1bcc 4690 }
20a69341 4691
7dab8ee3 4692 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
20a69341 4693
cac20fcd 4694 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 4695 if (IS_ERR(set)) {
36dd1bcc
PNA		 4696 if (PTR_ERR(set) != -ENOENT) {
4697 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4698 return PTR_ERR(set);
36dd1bcc 4699 }
1a28ad74 4700 } else {
a8fe4154
PNA		 4701 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4702
7dab8ee3 4703 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 4704 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4705 return -EEXIST;
36dd1bcc 4706 }
7dab8ee3 4707 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
20a69341 4708 return -EOPNOTSUPP;
36dd1bcc 4709
a8fe4154
PNA		 4710 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4711 if (err < 0)
4712 return err;
4713
f6594c37
PNA		 4714 err = 0;
4715 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4716 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4717 err = -EEXIST;
4718 }
4719
a8fe4154
PNA		 4720 for (i = 0; i < num_exprs; i++)
4721 nft_expr_destroy(&ctx, exprs[i]);
4722
123b9961
PNA		 4723 if (err < 0)
4724 return err;
4725
4726 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
20a69341
PM		 4727 }
4728
7dab8ee3 4729 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
20a69341
PM		 4730 return -ENOENT;
4731
bed4a63e 4732 ops = nft_select_set_ops(&ctx, nla, &desc);
20a69341
PM		 4733 if (IS_ERR(ops))
4734 return PTR_ERR(ops);
4735
e6d8ecac
CFG		 4736 udlen = 0;
4737 if (nla[NFTA_SET_USERDATA])
4738 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4739
20a69341
PM		 4740 size = 0;
4741 if (ops->privsize != NULL)
347b408d 4742 size = ops->privsize(nla, &desc);
6c8774a9 4743 alloc_size = sizeof(*set) + size + udlen;
45928afe 4744 if (alloc_size < size || alloc_size > INT_MAX)
6c8774a9 4745 return -ENOMEM;
33758c89 4746 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
24d19826
FW		 4747 if (!set)
4748 return -ENOMEM;
20a69341 4749
33758c89 4750 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
38745490
PS		 4751 if (!name) {
4752 err = -ENOMEM;
65038428 4753 goto err_set_name;
38745490
PS		 4754 }
4755
20a69341 4756 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 4757 kfree(name);
20a69341 4758 if (err < 0)
ad9f151e
PNA		 4759 goto err_set_name;
4760
4761 udata = NULL;
4762 if (udlen) {
4763 udata = set->data + size;
4764 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4765 }
4766
4767 INIT_LIST_HEAD(&set->bindings);
4768 INIT_LIST_HEAD(&set->catchall_list);
4769 set->table = table;
4770 write_pnet(&set->net, net);
4771 set->ops = ops;
bed4a63e 4772 set->ktype = desc.ktype;
ad9f151e 4773 set->klen = desc.klen;
bed4a63e
PNA		 4774 set->dtype = desc.dtype;
4775 set->objtype = desc.objtype;
ad9f151e
PNA		 4776 set->dlen = desc.dlen;
4777 set->flags = flags;
4778 set->size = desc.size;
bed4a63e 4779 set->policy = desc.policy;
ad9f151e
PNA		 4780 set->udlen = udlen;
4781 set->udata = udata;
bed4a63e
PNA		 4782 set->timeout = desc.timeout;
4783 set->gc_int = desc.gc_int;
ad9f151e
PNA		 4784
4785 set->field_count = desc.field_count;
4786 for (i = 0; i < desc.field_count; i++)
4787 set->field_len[i] = desc.field_len[i];
4788
4789 err = ops->init(set, &desc, nla);
4790 if (err < 0)
4791 goto err_set_init;
65038428 4792
a8fe4154
PNA		 4793 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4794 if (err < 0)
4795 goto err_set_destroy;
20a69341 4796
a8fe4154 4797 set->num_exprs = num_exprs;
3ecbfd65 4798 set->handle = nf_tables_alloc_handle(table);
20a69341 4799
958bee14 4800 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 4801 if (err < 0)
ad9f151e 4802 goto err_set_expr_alloc;
20a69341 4803
e688a7f8 4804 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 4805 table->use++;
20a69341
PM		 4806 return 0;
4807
ad9f151e 4808err_set_expr_alloc:
8cfd9b0f
PNA		 4809 for (i = 0; i < set->num_exprs; i++)
4810 nft_expr_destroy(&ctx, set->exprs[i]);
a8fe4154 4811err_set_destroy:
ad9f151e
PNA		 4812 ops->destroy(set);
4813err_set_init:
2f6adf48 4814 kfree(set->name);
65038428 4815err_set_name:
1ff75a3e 4816 kvfree(set);
20a69341
PM		 4817 return err;
4818}
4819
aaa31047
PNA		 4820static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4821 struct nft_set *set)
4822{
0f7d9b31 4823 struct nft_set_elem_catchall *next, *catchall;
aaa31047 4824
0f7d9b31 4825 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
aaa31047
PNA		 4826 list_del_rcu(&catchall->list);
4827 nft_set_elem_destroy(set, catchall->elem, true);
ae089831 4828 kfree_rcu(catchall, rcu);
aaa31047
PNA		 4829 }
4830}
4831
0c2a85ed 4832static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
20a69341 4833{
8cfd9b0f
PNA		 4834 int i;
4835
273fe3f1
PNA		 4836 if (WARN_ON(set->use > 0))
4837 return;
4838
8cfd9b0f
PNA		 4839 for (i = 0; i < set->num_exprs; i++)
4840 nft_expr_destroy(ctx, set->exprs[i]);
65038428 4841
20a69341 4842 set->ops->destroy(set);
aaa31047 4843 nft_set_catchall_destroy(ctx, set);
38745490 4844 kfree(set->name);
1ff75a3e 4845 kvfree(set);
20a69341
PM		 4846}
4847
7dab8ee3
PNA		 4848static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4849 const struct nlattr * const nla[])
20a69341 4850{
7dab8ee3
PNA		 4851 struct netlink_ext_ack *extack = info->extack;
4852 u8 genmask = nft_genmask_next(info->net);
67086651 4853 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 4854 struct net *net = info->net;
36dd1bcc 4855 const struct nlattr *attr;
67086651 4856 struct nft_table *table;
20a69341
PM		 4857 struct nft_set *set;
4858 struct nft_ctx ctx;
20a69341 4859
ef4b65e5 4860 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
ec2c9935 4861 return -EAFNOSUPPORT;
20a69341 4862
67086651
PNA		 4863 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4864 genmask, NETLINK_CB(skb).portid);
4865 if (IS_ERR(table)) {
4866 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4867 return PTR_ERR(table);
4868 }
20a69341 4869
36dd1bcc
PNA		 4870 if (nla[NFTA_SET_HANDLE]) {
4871 attr = nla[NFTA_SET_HANDLE];
67086651 4872 set = nft_set_lookup_byhandle(table, attr, genmask);
36dd1bcc
PNA		 4873 } else {
4874 attr = nla[NFTA_SET_NAME];
67086651 4875 set = nft_set_lookup(table, attr, genmask);
36dd1bcc 4876 }
a8278400 4877
36dd1bcc 4878 if (IS_ERR(set)) {
f80a612d
FFM		 4879 if (PTR_ERR(set) == -ENOENT &&
4880 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
4881 return 0;
4882
36dd1bcc
PNA		 4883 NL_SET_BAD_ATTR(extack, attr);
4884 return PTR_ERR(set);
4885 }
273fe3f1 4886 if (set->use ||
7dab8ee3
PNA		 4887 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4888 atomic_read(&set->nelems) > 0)) {
36dd1bcc 4889 NL_SET_BAD_ATTR(extack, attr);
20a69341 4890 return -EBUSY;
36dd1bcc 4891 }
20a69341 4892
67086651
PNA		 4893 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4894
ee01d542 4895 return nft_delset(&ctx, set);
20a69341
PM		 4896}
4897
345023b0
PNA		 4898static int nft_validate_register_store(const struct nft_ctx *ctx,
4899 enum nft_registers reg,
4900 const struct nft_data *data,
4901 enum nft_data_types type,
4902 unsigned int len);
4903
97c976d6
PNA		 4904static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4905 struct nft_set *set,
4906 struct nft_set_elem *elem)
20a69341 4907{
fe2811eb 4908 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4909 enum nft_registers dreg;
4910
4911 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 4912 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4913 set->dtype == NFT_DATA_VERDICT ?
4914 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4915 set->dlen);
20a69341
PM		 4916}
4917
97c976d6
PNA		 4918static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4919 struct nft_set *set,
4920 const struct nft_set_iter *iter,
4921 struct nft_set_elem *elem)
4922{
4923 return nft_setelem_data_validate(ctx, set, elem);
4924}
4925
aaa31047
PNA		 4926static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4927 struct nft_set *set)
4928{
4929 u8 genmask = nft_genmask_next(ctx->net);
4930 struct nft_set_elem_catchall *catchall;
4931 struct nft_set_elem elem;
4932 struct nft_set_ext *ext;
4933 int ret = 0;
4934
4935 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4936 ext = nft_set_elem_ext(set, catchall->elem);
4937 if (!nft_set_elem_active(ext, genmask))
4938 continue;
4939
4940 elem.priv = catchall->elem;
4941 ret = nft_setelem_data_validate(ctx, set, &elem);
4942 if (ret < 0)
4943 break;
4944 }
4945
4946 return ret;
4947}
4948
20a69341
PM		 4949int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4950 struct nft_set_binding *binding)
4951{
4952 struct nft_set_binding *i;
4953 struct nft_set_iter iter;
4954
273fe3f1
PNA		 4955 if (set->use == UINT_MAX)
4956 return -EOVERFLOW;
4957
408070d6 4958 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 4959 return -EBUSY;
4960
11113e19 4961 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 4962 /* If the set is already bound to the same chain all
4963 * jumps are already validated for that chain.
4964 */
4965 list_for_each_entry(i, &set->bindings, list) {
a4684402 4966 if (i->flags & NFT_SET_MAP &&
11113e19 4967 i->chain == binding->chain)
20a69341
PM		 4968 goto bind;
4969 }
4970
8588ac09 4971 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4972 iter.skip = 0;
4973 iter.count = 0;
4974 iter.err = 0;
4975 iter.fn = nf_tables_bind_check_setelem;
4976
4977 set->ops->walk(ctx, set, &iter);
aaa31047
PNA		 4978 if (!iter.err)
4979 iter.err = nft_set_catchall_bind_check(ctx, set);
4980
a02f4248 4981 if (iter.err < 0)
20a69341 4982 return iter.err;
20a69341
PM		 4983 }
4984bind:
4985 binding->chain = ctx->chain;
e688a7f8 4986 list_add_tail_rcu(&binding->list, &set->bindings);
f6ac8585 4987 nft_set_trans_bind(ctx, set);
273fe3f1 4988 set->use++;
f6ac8585 4989
20a69341
PM		 4990 return 0;
4991}
63aea290 4992EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341 4993
3b0a081d
FW		 4994static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4995 struct nft_set_binding *binding, bool event)
20a69341 4996{
e688a7f8 4997 list_del_rcu(&binding->list);
20a69341 4998
f6ac8585 4999 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
cd5125d8 5000 list_del_rcu(&set->list);
f6ac8585
PNA		 5001 if (event)
5002 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5003 GFP_KERNEL);
5004 }
20a69341
PM		 5005}
5006
273fe3f1
PNA		 5007void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5008 struct nft_set_binding *binding,
5009 enum nft_trans_phase phase)
5010{
5011 switch (phase) {
5012 case NFT_TRANS_PREPARE:
5013 set->use--;
5014 return;
5015 case NFT_TRANS_ABORT:
5016 case NFT_TRANS_RELEASE:
5017 set->use--;
954d8297 5018 fallthrough;
273fe3f1
PNA		 5019 default:
5020 nf_tables_unbind_set(ctx, set, binding,
5021 phase == NFT_TRANS_COMMIT);
5022 }
5023}
5024EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5025
cd5125d8
FW		 5026void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5027{
f6ac8585 5028 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
0c2a85ed 5029 nft_set_destroy(ctx, set);
cd5125d8
FW		 5030}
5031EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5032
3ac4c07a
PM		 5033const struct nft_set_ext_type nft_set_ext_types[] = {
5034 [NFT_SET_EXT_KEY] = {
7d740264 5035 .align = __alignof__(u32),
3ac4c07a
PM		 5036 },
5037 [NFT_SET_EXT_DATA] = {
7d740264 5038 .align = __alignof__(u32),
3ac4c07a 5039 },
563125a7
PNA		 5040 [NFT_SET_EXT_EXPRESSIONS] = {
5041 .align = __alignof__(struct nft_set_elem_expr),
f25ad2e9 5042 },
8aeff920
PNA		 5043 [NFT_SET_EXT_OBJREF] = {
5044 .len = sizeof(struct nft_object *),
5045 .align = __alignof__(struct nft_object *),
5046 },
3ac4c07a
PM		 5047 [NFT_SET_EXT_FLAGS] = {
5048 .len = sizeof(u8),
5049 .align = __alignof__(u8),
5050 },
c3e1b005
PM		 5051 [NFT_SET_EXT_TIMEOUT] = {
5052 .len = sizeof(u64),
5053 .align = __alignof__(u64),
5054 },
5055 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 5056 .len = sizeof(u64),
5057 .align = __alignof__(u64),
c3e1b005 5058 },
68e942e8
PM		 5059 [NFT_SET_EXT_USERDATA] = {
5060 .len = sizeof(struct nft_userdata),
5061 .align = __alignof__(struct nft_userdata),
5062 },
7b225d0b
PNA		 5063 [NFT_SET_EXT_KEY_END] = {
5064 .align = __alignof__(u32),
5065 },
3ac4c07a 5066};
3ac4c07a 5067
20a69341
PM		 5068/*
5069 * Set elements
5070 */
5071
5072static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5073 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5074 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5075 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 5076 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
79ebb5bb 5077 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
68e942e8
PM		 5078 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5079 .len = NFT_USERDATA_MAXLEN },
467697d2 5080 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
9332d27d
FW		 5081 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5082 .len = NFT_OBJ_MAXNAMELEN - 1 },
7b225d0b 5083 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
48b0ae04 5084 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
20a69341
PM		 5085};
5086
5087static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 5088 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5089 .len = NFT_TABLE_MAXNAMELEN - 1 },
5090 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5091 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 5092 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 5093 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 5094};
5095
563125a7
PNA		 5096static int nft_set_elem_expr_dump(struct sk_buff *skb,
5097 const struct nft_set *set,
5098 const struct nft_set_ext *ext)
5099{
5100 struct nft_set_elem_expr *elem_expr;
5101 u32 size, num_exprs = 0;
5102 struct nft_expr *expr;
48b0ae04 5103 struct nlattr *nest;
563125a7
PNA		 5104
5105 elem_expr = nft_set_ext_expr(ext);
5106 nft_setelem_expr_foreach(expr, elem_expr, size)
5107 num_exprs++;
5108
5109 if (num_exprs == 1) {
5110 expr = nft_setelem_expr_at(elem_expr, 0);
8daa8fde 5111 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
563125a7
PNA		 5112 return -1;
5113
5114 return 0;
48b0ae04
PNA		 5115 } else if (num_exprs > 1) {
5116 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5117 if (nest == NULL)
5118 goto nla_put_failure;
563125a7 5119
48b0ae04
PNA		 5120 nft_setelem_expr_foreach(expr, elem_expr, size) {
5121 expr = nft_setelem_expr_at(elem_expr, size);
8daa8fde 5122 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
48b0ae04
PNA		 5123 goto nla_put_failure;
5124 }
5125 nla_nest_end(skb, nest);
5126 }
563125a7 5127 return 0;
48b0ae04
PNA		 5128
5129nla_put_failure:
5130 return -1;
563125a7
PNA		 5131}
5132
20a69341
PM		 5133static int nf_tables_fill_setelem(struct sk_buff *skb,
5134 const struct nft_set *set,
5135 const struct nft_set_elem *elem)
5136{
fe2811eb 5137 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 5138 unsigned char *b = skb_tail_pointer(skb);
5139 struct nlattr *nest;
5140
ae0be8de 5141 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
20a69341
PM		 5142 if (nest == NULL)
5143 goto nla_put_failure;
5144
aaa31047
PNA		 5145 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5146 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
fe2811eb 5147 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 5148 goto nla_put_failure;
5149
7b225d0b
PNA		 5150 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5151 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5152 NFT_DATA_VALUE, set->klen) < 0)
5153 goto nla_put_failure;
5154
fe2811eb
PM		 5155 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5156 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 5157 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5158 set->dlen) < 0)
5159 goto nla_put_failure;
5160
563125a7
PNA		 5161 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5162 nft_set_elem_expr_dump(skb, set, ext))
f25ad2e9
PM		 5163 goto nla_put_failure;
5164
8aeff920
PNA		 5165 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5166 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
d152159b 5167 (*nft_set_ext_obj(ext))->key.name) < 0)
8aeff920
PNA		 5168 goto nla_put_failure;
5169
fe2811eb
PM		 5170 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5171 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5172 htonl(*nft_set_ext_flags(ext))))
5173 goto nla_put_failure;
20a69341 5174
c3e1b005
PM		 5175 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5176 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 5177 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 5178 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 5179 goto nla_put_failure;
5180
5181 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 5182 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 5183
5184 expires = *nft_set_ext_expiration(ext);
8e1102d5 5185 if (time_before64(now, expires))
c3e1b005
PM		 5186 expires -= now;
5187 else
5188 expires = 0;
5189
5190 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 5191 nf_jiffies64_to_msecs(expires),
b46f6ded 5192 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 5193 goto nla_put_failure;
5194 }
5195
68e942e8
PM		 5196 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5197 struct nft_userdata *udata;
5198
5199 udata = nft_set_ext_userdata(ext);
5200 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5201 udata->len + 1, udata->data))
5202 goto nla_put_failure;
5203 }
5204
20a69341
PM		 5205 nla_nest_end(skb, nest);
5206 return 0;
5207
5208nla_put_failure:
5209 nlmsg_trim(skb, b);
5210 return -EMSGSIZE;
5211}
5212
5213struct nft_set_dump_args {
5214 const struct netlink_callback *cb;
5215 struct nft_set_iter iter;
5216 struct sk_buff *skb;
5217};
5218
5219static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 5220 struct nft_set *set,
20a69341 5221 const struct nft_set_iter *iter,
de70185d 5222 struct nft_set_elem *elem)
20a69341
PM		 5223{
5224 struct nft_set_dump_args *args;
5225
5226 args = container_of(iter, struct nft_set_dump_args, iter);
5227 return nf_tables_fill_setelem(args->skb, set, elem);
5228}
5229
fa803605
LZ		 5230struct nft_set_dump_ctx {
5231 const struct nft_set *set;
5232 struct nft_ctx ctx;
5233};
5234
aaa31047
PNA		 5235static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5236 const struct nft_set *set)
5237{
5238 struct nft_set_elem_catchall *catchall;
5239 u8 genmask = nft_genmask_cur(net);
5240 struct nft_set_elem elem;
5241 struct nft_set_ext *ext;
5242 int ret = 0;
5243
5244 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5245 ext = nft_set_elem_ext(set, catchall->elem);
5246 if (!nft_set_elem_active(ext, genmask) ||
5247 nft_set_elem_expired(ext))
5248 continue;
5249
5250 elem.priv = catchall->elem;
5251 ret = nf_tables_fill_setelem(skb, set, &elem);
5252 break;
5253 }
5254
5255 return ret;
5256}
5257
20a69341
PM		 5258static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5259{
fa803605 5260 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 5261 struct net *net = sock_net(skb->sk);
0854db2a 5262 struct nftables_pernet *nft_net;
fa803605 5263 struct nft_table *table;
de70185d 5264 struct nft_set *set;
20a69341 5265 struct nft_set_dump_args args;
fa803605 5266 bool set_found = false;
20a69341
PM		 5267 struct nlmsghdr *nlh;
5268 struct nlattr *nest;
5269 u32 portid, seq;
fa803605 5270 int event;
20a69341 5271
fa803605 5272 rcu_read_lock();
d59d2f82 5273 nft_net = nft_pernet(net);
34002783
PNA		 5274 cb->seq = READ_ONCE(nft_net->base_seq);
5275
0854db2a 5276 list_for_each_entry_rcu(table, &nft_net->tables, list) {
36596dad 5277 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 5278 dump_ctx->ctx.family != table->family)
fa803605 5279 continue;
20a69341 5280
36596dad
PNA		 5281 if (table != dump_ctx->ctx.table)
5282 continue;
20a69341 5283
36596dad
PNA		 5284 list_for_each_entry_rcu(set, &table->sets, list) {
5285 if (set == dump_ctx->set) {
5286 set_found = true;
5287 break;
fa803605 5288 }
fa803605
LZ		 5289 }
5290 break;
5291 }
5292
5293 if (!set_found) {
5294 rcu_read_unlock();
5295 return -ENOENT;
5296 }
20a69341 5297
dedb67c4 5298 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 5299 portid = NETLINK_CB(cb->skb).portid;
5300 seq = cb->nlh->nlmsg_seq;
5301
19c28b13
PNA		 5302 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5303 table->family, NFNETLINK_V0, nft_base_seq(net));
5304 if (!nlh)
20a69341
PM		 5305 goto nla_put_failure;
5306
fa803605 5307 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 5308 goto nla_put_failure;
5309 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5310 goto nla_put_failure;
5311
ae0be8de 5312 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
20a69341
PM		 5313 if (nest == NULL)
5314 goto nla_put_failure;
5315
8588ac09
PNA		 5316 args.cb = cb;
5317 args.skb = skb;
fa803605 5318 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 5319 args.iter.skip = cb->args[0];
5320 args.iter.count = 0;
5321 args.iter.err = 0;
5322 args.iter.fn = nf_tables_dump_setelem;
fa803605 5323 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
aaa31047
PNA		 5324
5325 if (!args.iter.err && args.iter.count == cb->args[0])
5326 args.iter.err = nft_set_catchall_dump(net, skb, set);
fa803605 5327 rcu_read_unlock();
20a69341
PM		 5328
5329 nla_nest_end(skb, nest);
5330 nlmsg_end(skb, nlh);
5331
5332 if (args.iter.err && args.iter.err != -EMSGSIZE)
5333 return args.iter.err;
5334 if (args.iter.count == cb->args[0])
5335 return 0;
5336
5337 cb->args[0] = args.iter.count;
5338 return skb->len;
5339
5340nla_put_failure:
fa803605 5341 rcu_read_unlock();
20a69341
PM		 5342 return -ENOSPC;
5343}
5344
90fd131a
FW		 5345static int nf_tables_dump_set_start(struct netlink_callback *cb)
5346{
5347 struct nft_set_dump_ctx *dump_ctx = cb->data;
5348
5349 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5350
5351 return cb->data ? 0 : -ENOMEM;
5352}
5353
fa803605
LZ		 5354static int nf_tables_dump_set_done(struct netlink_callback *cb)
5355{
5356 kfree(cb->data);
5357 return 0;
5358}
5359
d60ce62f
AB		 5360static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5361 const struct nft_ctx *ctx, u32 seq,
5362 u32 portid, int event, u16 flags,
5363 const struct nft_set *set,
5364 const struct nft_set_elem *elem)
5365{
d60ce62f
AB		 5366 struct nlmsghdr *nlh;
5367 struct nlattr *nest;
5368 int err;
5369
dedb67c4 5370 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 5371 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5372 NFNETLINK_V0, nft_base_seq(ctx->net));
5373 if (!nlh)
d60ce62f
AB		 5374 goto nla_put_failure;
5375
d60ce62f
AB		 5376 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5377 goto nla_put_failure;
5378 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5379 goto nla_put_failure;
5380
ae0be8de 5381 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
d60ce62f
AB		 5382 if (nest == NULL)
5383 goto nla_put_failure;
5384
5385 err = nf_tables_fill_setelem(skb, set, elem);
5386 if (err < 0)
5387 goto nla_put_failure;
5388
5389 nla_nest_end(skb, nest);
5390
053c095a
JB		 5391 nlmsg_end(skb, nlh);
5392 return 0;
d60ce62f
AB		 5393
5394nla_put_failure:
5395 nlmsg_trim(skb, nlh);
5396 return -1;
5397}
5398
ba0e4d99
PNA		 5399static int nft_setelem_parse_flags(const struct nft_set *set,
5400 const struct nlattr *attr, u32 *flags)
5401{
5402 if (attr == NULL)
5403 return 0;
5404
5405 *flags = ntohl(nla_get_be32(attr));
aaa31047
PNA		 5406 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5407 return -EOPNOTSUPP;
ba0e4d99
PNA		 5408 if (!(set->flags & NFT_SET_INTERVAL) &&
5409 *flags & NFT_SET_ELEM_INTERVAL_END)
5410 return -EINVAL;
fc0ae524
PNA		 5411 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5412 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5413 return -EINVAL;
ba0e4d99
PNA		 5414
5415 return 0;
5416}
5417
20a1452c
PNA		 5418static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5419 struct nft_data *key, struct nlattr *attr)
5420{
341b6941
PNA		 5421 struct nft_data_desc desc = {
5422 .type = NFT_DATA_VALUE,
5423 .size = NFT_DATA_VALUE_MAXLEN,
5424 .len = set->klen,
5425 };
20a1452c 5426
341b6941 5427 return nft_data_init(ctx, key, &desc, attr);
20a1452c
PNA		 5428}
5429
fdb9c405
PNA		 5430static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5431 struct nft_data_desc *desc,
5432 struct nft_data *data,
5433 struct nlattr *attr)
5434{
7e6bc1f6 5435 u32 dtype;
fdb9c405 5436
7e6bc1f6
PNA		 5437 if (set->dtype == NFT_DATA_VERDICT)
5438 dtype = NFT_DATA_VERDICT;
5439 else
5440 dtype = NFT_DATA_VALUE;
5441
341b6941
PNA		 5442 desc->type = dtype;
5443 desc->size = NFT_DATA_VALUE_MAXLEN;
5444 desc->len = set->dlen;
f323ef3a 5445 desc->flags = NFT_DATA_DESC_SETELEM;
fdb9c405 5446
341b6941 5447 return nft_data_init(ctx, data, desc, attr);
fdb9c405
PNA		 5448}
5449
aaa31047
PNA		 5450static void *nft_setelem_catchall_get(const struct net *net,
5451 const struct nft_set *set)
5452{
5453 struct nft_set_elem_catchall *catchall;
5454 u8 genmask = nft_genmask_cur(net);
5455 struct nft_set_ext *ext;
5456 void *priv = NULL;
5457
5458 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5459 ext = nft_set_elem_ext(set, catchall->elem);
5460 if (!nft_set_elem_active(ext, genmask) ||
5461 nft_set_elem_expired(ext))
5462 continue;
5463
5464 priv = catchall->elem;
5465 break;
5466 }
5467
5468 return priv;
5469}
5470
5471static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5472 struct nft_set_elem *elem, u32 flags)
5473{
5474 void *priv;
5475
5476 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5477 priv = set->ops->get(ctx->net, set, elem, flags);
5478 if (IS_ERR(priv))
5479 return PTR_ERR(priv);
5480 } else {
5481 priv = nft_setelem_catchall_get(ctx->net, set);
5482 if (!priv)
5483 return -ENOENT;
5484 }
5485 elem->priv = priv;
5486
5487 return 0;
5488}
5489
ba0e4d99
PNA		 5490static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5491 const struct nlattr *attr)
5492{
5493 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 5494 struct nft_set_elem elem;
5495 struct sk_buff *skb;
5496 uint32_t flags = 0;
ba0e4d99
PNA		 5497 int err;
5498
8cb08174
JB		 5499 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5500 nft_set_elem_policy, NULL);
ba0e4d99
PNA		 5501 if (err < 0)
5502 return err;
5503
ba0e4d99
PNA		 5504 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5505 if (err < 0)
5506 return err;
5507
aaa31047
PNA		 5508 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5509 return -EINVAL;
5510
5511 if (nla[NFTA_SET_ELEM_KEY]) {
5512 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5513 nla[NFTA_SET_ELEM_KEY]);
5514 if (err < 0)
5515 return err;
5516 }
ba0e4d99 5517
7b225d0b
PNA		 5518 if (nla[NFTA_SET_ELEM_KEY_END]) {
5519 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5520 nla[NFTA_SET_ELEM_KEY_END]);
5521 if (err < 0)
5522 return err;
5523 }
5524
aaa31047
PNA		 5525 err = nft_setelem_get(ctx, set, &elem, flags);
5526 if (err < 0)
5527 return err;
ba0e4d99
PNA		 5528
5529 err = -ENOMEM;
d9adf22a 5530 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99 5531 if (skb == NULL)
ee921183 5532 return err;
ba0e4d99
PNA		 5533
5534 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5535 NFT_MSG_NEWSETELEM, 0, set, &elem);
5536 if (err < 0)
ee921183 5537 goto err_fill_setelem;
ba0e4d99 5538
ee921183 5539 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
ba0e4d99 5540
ee921183 5541err_fill_setelem:
ba0e4d99 5542 kfree_skb(skb);
ee921183 5543 return err;
ba0e4d99
PNA		 5544}
5545
d9adf22a 5546/* called with rcu_read_lock held */
797d4980
PNA		 5547static int nf_tables_getsetelem(struct sk_buff *skb,
5548 const struct nfnl_info *info,
5549 const struct nlattr * const nla[])
ba0e4d99 5550{
797d4980
PNA		 5551 struct netlink_ext_ack *extack = info->extack;
5552 u8 genmask = nft_genmask_cur(info->net);
e2b750d7 5553 u8 family = info->nfmsg->nfgen_family;
797d4980 5554 struct net *net = info->net;
e2b750d7 5555 struct nft_table *table;
ba0e4d99
PNA		 5556 struct nft_set *set;
5557 struct nlattr *attr;
5558 struct nft_ctx ctx;
5559 int rem, err = 0;
5560
e2b750d7 5561 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
92f3e96d 5562 genmask, 0);
e2b750d7
PNA		 5563 if (IS_ERR(table)) {
5564 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5565 return PTR_ERR(table);
5566 }
ba0e4d99 5567
e2b750d7 5568 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 5569 if (IS_ERR(set))
5570 return PTR_ERR(set);
5571
e2b750d7
PNA		 5572 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5573
797d4980 5574 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
ba0e4d99 5575 struct netlink_dump_control c = {
90fd131a 5576 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 5577 .dump = nf_tables_dump_set,
5578 .done = nf_tables_dump_set_done,
d9adf22a 5579 .module = THIS_MODULE,
ba0e4d99 5580 };
90fd131a
FW		 5581 struct nft_set_dump_ctx dump_ctx = {
5582 .set = set,
5583 .ctx = ctx,
5584 };
ba0e4d99 5585
90fd131a 5586 c.data = &dump_ctx;
797d4980 5587 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
ba0e4d99
PNA		 5588 }
5589
5590 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5591 return -EINVAL;
5592
5593 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5594 err = nft_get_set_elem(&ctx, set, attr);
b53c1166
PNA		 5595 if (err < 0) {
5596 NL_SET_BAD_ATTR(extack, attr);
ba0e4d99 5597 break;
b53c1166 5598 }
ba0e4d99
PNA		 5599 }
5600
5601 return err;
5602}
5603
25e94a99
PNA		 5604static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5605 const struct nft_set *set,
5606 const struct nft_set_elem *elem,
6fb721cf 5607 int event)
d60ce62f 5608{
0854db2a 5609 struct nftables_pernet *nft_net;
128ad332
PNA		 5610 struct net *net = ctx->net;
5611 u32 portid = ctx->portid;
d60ce62f 5612 struct sk_buff *skb;
6fb721cf 5613 u16 flags = 0;
d60ce62f
AB		 5614 int err;
5615
128ad332 5616 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5617 return;
d60ce62f 5618
d60ce62f
AB		 5619 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5620 if (skb == NULL)
5621 goto err;
5622
6fb721cf
PNA		 5623 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5624 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5625
d60ce62f
AB		 5626 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5627 set, elem);
5628 if (err < 0) {
5629 kfree_skb(skb);
5630 goto err;
5631 }
5632
d59d2f82 5633 nft_net = nft_pernet(net);
0854db2a 5634 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
25e94a99 5635 return;
d60ce62f 5636err:
25e94a99 5637 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 5638}
5639
60319eb1
PNA		 5640static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5641 int msg_type,
5642 struct nft_set *set)
5643{
5644 struct nft_trans *trans;
5645
5646 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5647 if (trans == NULL)
5648 return NULL;
5649
5650 nft_trans_elem_set(trans) = set;
5651 return trans;
5652}
5653
a7fc9368
PNA		 5654struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5655 const struct nft_set *set,
5656 const struct nlattr *attr)
5657{
5658 struct nft_expr *expr;
5659 int err;
5660
5661 expr = nft_expr_init(ctx, attr);
5662 if (IS_ERR(expr))
5663 return expr;
5664
5665 err = -EOPNOTSUPP;
a7fc9368
PNA		 5666 if (expr->ops->type->flags & NFT_EXPR_GC) {
5667 if (set->flags & NFT_SET_TIMEOUT)
5668 goto err_set_elem_expr;
5669 if (!set->ops->gc_init)
5670 goto err_set_elem_expr;
5671 set->ops->gc_init(set);
5672 }
5673
5674 return expr;
5675
5676err_set_elem_expr:
5677 nft_expr_destroy(ctx, expr);
5678 return ERR_PTR(err);
5679}
5680
34aae2c2
PNA		 5681static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5682{
5683 len += nft_set_ext_types[id].len;
5684 if (len > tmpl->ext_len[id] ||
5685 len > U8_MAX)
5686 return -1;
5687
5688 return 0;
5689}
5690
5691static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5692 void *to, const void *from, u32 len)
5693{
5694 if (nft_set_ext_check(tmpl, id, len) < 0)
5695 return -1;
5696
5697 memcpy(to, from, len);
5698
5699 return 0;
5700}
5701
22fe54d5
PM		 5702void *nft_set_elem_init(const struct nft_set *set,
5703 const struct nft_set_ext_tmpl *tmpl,
7b225d0b
PNA		 5704 const u32 *key, const u32 *key_end,
5705 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
fe2811eb
PM		 5706{
5707 struct nft_set_ext *ext;
5708 void *elem;
5709
5710 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5711 if (elem == NULL)
34aae2c2 5712 return ERR_PTR(-ENOMEM);
fe2811eb
PM		 5713
5714 ext = nft_set_elem_ext(set, elem);
5715 nft_set_ext_init(ext, tmpl);
5716
34aae2c2
PNA		 5717 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5718 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5719 nft_set_ext_key(ext), key, set->klen) < 0)
5720 goto err_ext_check;
5721
5722 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5723 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5724 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5725 goto err_ext_check;
5726
5727 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5728 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5729 nft_set_ext_data(ext), data, set->dlen) < 0)
5730 goto err_ext_check;
5731
79ebb5bb
LGL		 5732 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5733 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5734 if (expiration == 0)
5735 *nft_set_ext_expiration(ext) += timeout;
5736 }
c3e1b005
PM		 5737 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5738 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 5739
5740 return elem;
34aae2c2
PNA		 5741
5742err_ext_check:
5743 kfree(elem);
5744
5745 return ERR_PTR(-EINVAL);
fe2811eb
PM		 5746}
5747
563125a7
PNA		 5748static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5749 struct nft_expr *expr)
475beb9c
PNA		 5750{
5751 if (expr->ops->destroy_clone) {
5752 expr->ops->destroy_clone(ctx, expr);
5753 module_put(expr->ops->type->owner);
5754 } else {
5755 nf_tables_expr_destroy(ctx, expr);
5756 }
5757}
5758
563125a7
PNA		 5759static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5760 struct nft_set_elem_expr *elem_expr)
5761{
5762 struct nft_expr *expr;
5763 u32 size;
5764
5765 nft_setelem_expr_foreach(expr, elem_expr, size)
5766 __nft_set_elem_expr_destroy(ctx, expr);
5767}
5768
61f9e292
LZ		 5769void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5770 bool destroy_expr)
61edafbb
PM		 5771{
5772 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 5773 struct nft_ctx ctx = {
5774 .net = read_pnet(&set->net),
5775 .family = set->table->family,
5776 };
61edafbb 5777
59105446 5778 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 5779 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 5780 nft_data_release(nft_set_ext_data(ext), set->dtype);
563125a7 5781 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
475beb9c 5782 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
371ebcbb 5783
8aeff920
PNA		 5784 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5785 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 5786 kfree(elem);
5787}
5788EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5789
f8bb7889
PNA		 5790/* Only called from commit path, nft_setelem_data_deactivate() already deals
5791 * with the refcounting from the preparation phase.
59105446 5792 */
3453c927
PNA		 5793static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5794 const struct nft_set *set, void *elem)
59105446
PNA		 5795{
5796 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5797
563125a7 5798 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
475beb9c
PNA		 5799 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5800
59105446
PNA		 5801 kfree(elem);
5802}
5803
fca05d4d
PNA		 5804int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5805 struct nft_expr *expr_array[])
8cfd9b0f
PNA		 5806{
5807 struct nft_expr *expr;
5808 int err, i, k;
5809
5810 for (i = 0; i < set->num_exprs; i++) {
42193ffd 5811 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
8cfd9b0f
PNA		 5812 if (!expr)
5813 goto err_expr;
5814
5815 err = nft_expr_clone(expr, set->exprs[i]);
5816 if (err < 0) {
c485c35f 5817 kfree(expr);
8cfd9b0f
PNA		 5818 goto err_expr;
5819 }
5820 expr_array[i] = expr;
5821 }
5822
5823 return 0;
5824
5825err_expr:
161b838e
CIK		 5826 for (k = i - 1; k >= 0; k--)
5827 nft_expr_destroy(ctx, expr_array[k]);
8cfd9b0f
PNA		 5828
5829 return -ENOMEM;
5830}
5831
4d8f9065 5832static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
34aae2c2 5833 const struct nft_set_ext_tmpl *tmpl,
4d8f9065
PNA		 5834 const struct nft_set_ext *ext,
5835 struct nft_expr *expr_array[],
5836 u32 num_exprs)
563125a7
PNA		 5837{
5838 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
34aae2c2 5839 u32 len = sizeof(struct nft_set_elem_expr);
4d8f9065
PNA		 5840 struct nft_expr *expr;
5841 int i, err;
5842
34aae2c2
PNA		 5843 if (num_exprs == 0)
5844 return 0;
5845
5846 for (i = 0; i < num_exprs; i++)
5847 len += expr_array[i]->ops->size;
5848
5849 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5850 return -EINVAL;
5851
4d8f9065
PNA		 5852 for (i = 0; i < num_exprs; i++) {
5853 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5854 err = nft_expr_clone(expr, expr_array[i]);
5855 if (err < 0)
5856 goto err_elem_expr_setup;
5857
5858 elem_expr->size += expr_array[i]->ops->size;
5859 nft_expr_destroy(ctx, expr_array[i]);
5860 expr_array[i] = NULL;
5861 }
5862
5863 return 0;
5864
5865err_elem_expr_setup:
5866 for (; i < num_exprs; i++) {
5867 nft_expr_destroy(ctx, expr_array[i]);
5868 expr_array[i] = NULL;
5869 }
563125a7 5870
4d8f9065 5871 return -ENOMEM;
563125a7
PNA		 5872}
5873
aaa31047
PNA		 5874struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5875 const struct nft_set *set)
5876{
5877 struct nft_set_elem_catchall *catchall;
5878 u8 genmask = nft_genmask_cur(net);
5879 struct nft_set_ext *ext;
5880
5881 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5882 ext = nft_set_elem_ext(set, catchall->elem);
5883 if (nft_set_elem_active(ext, genmask) &&
5884 !nft_set_elem_expired(ext))
5885 return ext;
5886 }
5887
5888 return NULL;
5889}
5890EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5891
5892void *nft_set_catchall_gc(const struct nft_set *set)
5893{
5894 struct nft_set_elem_catchall *catchall, *next;
5895 struct nft_set_ext *ext;
5896 void *elem = NULL;
5897
5898 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5899 ext = nft_set_elem_ext(set, catchall->elem);
5900
5901 if (!nft_set_elem_expired(ext) ||
5902 nft_set_elem_mark_busy(ext))
5903 continue;
5904
5905 elem = catchall->elem;
5906 list_del_rcu(&catchall->list);
5907 kfree_rcu(catchall, rcu);
5908 break;
5909 }
5910
5911 return elem;
5912}
5913EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5914
5915static int nft_setelem_catchall_insert(const struct net *net,
5916 struct nft_set *set,
5917 const struct nft_set_elem *elem,
5918 struct nft_set_ext **pext)
5919{
5920 struct nft_set_elem_catchall *catchall;
5921 u8 genmask = nft_genmask_next(net);
5922 struct nft_set_ext *ext;
5923
5924 list_for_each_entry(catchall, &set->catchall_list, list) {
5925 ext = nft_set_elem_ext(set, catchall->elem);
5926 if (nft_set_elem_active(ext, genmask)) {
5927 *pext = ext;
5928 return -EEXIST;
5929 }
5930 }
5931
5932 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5933 if (!catchall)
5934 return -ENOMEM;
5935
5936 catchall->elem = elem->priv;
5937 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5938
5939 return 0;
5940}
5941
5942static int nft_setelem_insert(const struct net *net,
5943 struct nft_set *set,
5944 const struct nft_set_elem *elem,
5945 struct nft_set_ext **ext, unsigned int flags)
5946{
5947 int ret;
5948
5949 if (flags & NFT_SET_ELEM_CATCHALL)
5950 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5951 else
5952 ret = set->ops->insert(net, set, elem, ext);
5953
5954 return ret;
5955}
5956
5957static bool nft_setelem_is_catchall(const struct nft_set *set,
5958 const struct nft_set_elem *elem)
5959{
5960 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5961
5962 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5963 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5964 return true;
5965
5966 return false;
5967}
5968
5969static void nft_setelem_activate(struct net *net, struct nft_set *set,
5970 struct nft_set_elem *elem)
5971{
5972 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5973
5974 if (nft_setelem_is_catchall(set, elem)) {
5975 nft_set_elem_change_active(net, set, ext);
5976 nft_set_elem_clear_busy(ext);
5977 } else {
5978 set->ops->activate(net, set, elem);
5979 }
5980}
5981
5982static int nft_setelem_catchall_deactivate(const struct net *net,
5983 struct nft_set *set,
5984 struct nft_set_elem *elem)
5985{
5986 struct nft_set_elem_catchall *catchall;
5987 struct nft_set_ext *ext;
5988
5989 list_for_each_entry(catchall, &set->catchall_list, list) {
5990 ext = nft_set_elem_ext(set, catchall->elem);
5991 if (!nft_is_active(net, ext) ||
5992 nft_set_elem_mark_busy(ext))
5993 continue;
5994
5995 kfree(elem->priv);
5996 elem->priv = catchall->elem;
5997 nft_set_elem_change_active(net, set, ext);
5998 return 0;
5999 }
6000
6001 return -ENOENT;
6002}
6003
6004static int __nft_setelem_deactivate(const struct net *net,
6005 struct nft_set *set,
6006 struct nft_set_elem *elem)
6007{
6008 void *priv;
6009
6010 priv = set->ops->deactivate(net, set, elem);
6011 if (!priv)
6012 return -ENOENT;
6013
6014 kfree(elem->priv);
6015 elem->priv = priv;
6016 set->ndeact++;
6017
6018 return 0;
6019}
6020
6021static int nft_setelem_deactivate(const struct net *net,
6022 struct nft_set *set,
6023 struct nft_set_elem *elem, u32 flags)
6024{
6025 int ret;
6026
6027 if (flags & NFT_SET_ELEM_CATCHALL)
6028 ret = nft_setelem_catchall_deactivate(net, set, elem);
6029 else
6030 ret = __nft_setelem_deactivate(net, set, elem);
6031
6032 return ret;
6033}
6034
6035static void nft_setelem_catchall_remove(const struct net *net,
6036 const struct nft_set *set,
6037 const struct nft_set_elem *elem)
6038{
6039 struct nft_set_elem_catchall *catchall, *next;
6040
6041 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6042 if (catchall->elem == elem->priv) {
6043 list_del_rcu(&catchall->list);
ae089831 6044 kfree_rcu(catchall, rcu);
aaa31047
PNA		 6045 break;
6046 }
6047 }
6048}
6049
6050static void nft_setelem_remove(const struct net *net,
6051 const struct nft_set *set,
6052 const struct nft_set_elem *elem)
6053{
6054 if (nft_setelem_is_catchall(set, elem))
6055 nft_setelem_catchall_remove(net, set, elem);
6056 else
6057 set->ops->remove(net, set, elem);
6058}
6059
88cccd90
PNA		 6060static bool nft_setelem_valid_key_end(const struct nft_set *set,
6061 struct nlattr **nla, u32 flags)
6062{
6063 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6064 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6065 if (flags & NFT_SET_ELEM_INTERVAL_END)
6066 return false;
96df8360
PNA		 6067
6068 if (nla[NFTA_SET_ELEM_KEY_END] &&
6069 flags & NFT_SET_ELEM_CATCHALL)
88cccd90
PNA		 6070 return false;
6071 } else {
6072 if (nla[NFTA_SET_ELEM_KEY_END])
6073 return false;
6074 }
6075
6076 return true;
6077}
6078
60319eb1 6079static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 6080 const struct nlattr *attr, u32 nlmsg_flags)
20a69341 6081{
8cfd9b0f 6082 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
20a69341 6083 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 6084 u8 genmask = nft_genmask_next(ctx->net);
664899e8 6085 u32 flags = 0, size = 0, num_exprs = 0;
fe2811eb 6086 struct nft_set_ext_tmpl tmpl;
c016c7e4 6087 struct nft_set_ext *ext, *ext2;
20a69341
PM		 6088 struct nft_set_elem elem;
6089 struct nft_set_binding *binding;
8aeff920 6090 struct nft_object *obj = NULL;
68e942e8 6091 struct nft_userdata *udata;
20a1452c 6092 struct nft_data_desc desc;
20a69341 6093 enum nft_registers dreg;
60319eb1 6094 struct nft_trans *trans;
c3e1b005 6095 u64 timeout;
79ebb5bb 6096 u64 expiration;
8cfd9b0f 6097 int err, i;
68e942e8 6098 u8 ulen;
20a69341 6099
8cb08174
JB		 6100 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6101 nft_set_elem_policy, NULL);
20a69341
PM		 6102 if (err < 0)
6103 return err;
6104
fe2811eb
PM		 6105 nft_set_ext_prepare(&tmpl);
6106
0e9091d6
PNA		 6107 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6108 if (err < 0)
6109 return err;
aaa31047
PNA		 6110
6111 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6112 return -EINVAL;
6113
c39ba4de
PNA		 6114 if (flags != 0) {
6115 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6116 if (err < 0)
6117 return err;
6118 }
20a69341
PM		 6119
6120 if (set->flags & NFT_SET_MAP) {
6121 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 6122 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341
PM		 6123 return -EINVAL;
6124 } else {
6125 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6126 return -EINVAL;
6127 }
6128
5a2f3dc3
PNA		 6129 if (set->flags & NFT_SET_OBJECT) {
6130 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6131 !(flags & NFT_SET_ELEM_INTERVAL_END))
6132 return -EINVAL;
6133 } else {
6134 if (nla[NFTA_SET_ELEM_OBJREF])
6135 return -EINVAL;
6136 }
6137
88cccd90
PNA		 6138 if (!nft_setelem_valid_key_end(set, nla, flags))
6139 return -EINVAL;
6140
bffc124b
PNA		 6141 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6142 (nla[NFTA_SET_ELEM_DATA] ||
6143 nla[NFTA_SET_ELEM_OBJREF] ||
6144 nla[NFTA_SET_ELEM_TIMEOUT] ||
6145 nla[NFTA_SET_ELEM_EXPIRATION] ||
6146 nla[NFTA_SET_ELEM_USERDATA] ||
48b0ae04 6147 nla[NFTA_SET_ELEM_EXPR] ||
4963674c 6148 nla[NFTA_SET_ELEM_KEY_END] ||
48b0ae04 6149 nla[NFTA_SET_ELEM_EXPRESSIONS]))
bffc124b
PNA		 6150 return -EINVAL;
6151
c3e1b005
PM		 6152 timeout = 0;
6153 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6154 if (!(set->flags & NFT_SET_TIMEOUT))
6155 return -EINVAL;
8e1102d5
FW		 6156 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6157 &timeout);
6158 if (err)
6159 return err;
33c7aba0
PNA		 6160 } else if (set->flags & NFT_SET_TIMEOUT &&
6161 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
123b9961 6162 timeout = READ_ONCE(set->timeout);
c3e1b005
PM		 6163 }
6164
79ebb5bb
LGL		 6165 expiration = 0;
6166 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6167 if (!(set->flags & NFT_SET_TIMEOUT))
6168 return -EINVAL;
6169 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6170 &expiration);
6171 if (err)
6172 return err;
6173 }
6174
8cfd9b0f
PNA		 6175 if (nla[NFTA_SET_ELEM_EXPR]) {
6176 struct nft_expr *expr;
6177
664899e8 6178 if (set->num_exprs && set->num_exprs != 1)
8cfd9b0f
PNA		 6179 return -EOPNOTSUPP;
6180
40944452
PNA		 6181 expr = nft_set_elem_expr_alloc(ctx, set,
6182 nla[NFTA_SET_ELEM_EXPR]);
6183 if (IS_ERR(expr))
6184 return PTR_ERR(expr);
65038428 6185
8cfd9b0f 6186 expr_array[0] = expr;
664899e8 6187 num_exprs = 1;
65038428 6188
664899e8 6189 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
8cfd9b0f 6190 err = -EOPNOTSUPP;
65038428 6191 goto err_set_elem_expr;
8cfd9b0f 6192 }
48b0ae04
PNA		 6193 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6194 struct nft_expr *expr;
6195 struct nlattr *tmp;
6196 int left;
65038428 6197
48b0ae04
PNA		 6198 i = 0;
6199 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
664899e8
PNA		 6200 if (i == NFT_SET_EXPR_MAX ||
6201 (set->num_exprs && set->num_exprs == i)) {
48b0ae04
PNA		 6202 err = -E2BIG;
6203 goto err_set_elem_expr;
6204 }
6205 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6206 err = -EINVAL;
6207 goto err_set_elem_expr;
6208 }
6209 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6210 if (IS_ERR(expr)) {
6211 err = PTR_ERR(expr);
6212 goto err_set_elem_expr;
6213 }
6214 expr_array[i] = expr;
664899e8 6215 num_exprs++;
48b0ae04 6216
664899e8 6217 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
48b0ae04
PNA		 6218 err = -EOPNOTSUPP;
6219 goto err_set_elem_expr;
6220 }
6221 i++;
6222 }
664899e8 6223 if (set->num_exprs && set->num_exprs != i) {
48b0ae04 6224 err = -EOPNOTSUPP;
65038428 6225 goto err_set_elem_expr;
48b0ae04 6226 }
33c7aba0
PNA		 6227 } else if (set->num_exprs > 0 &&
6228 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
8cfd9b0f
PNA		 6229 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6230 if (err < 0)
6231 goto err_set_elem_expr_clone;
664899e8
PNA		 6232
6233 num_exprs = set->num_exprs;
40944452
PNA		 6234 }
6235
aaa31047
PNA		 6236 if (nla[NFTA_SET_ELEM_KEY]) {
6237 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6238 nla[NFTA_SET_ELEM_KEY]);
6239 if (err < 0)
6240 goto err_set_elem_expr;
20a69341 6241
c39ba4de
PNA		 6242 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6243 if (err < 0)
6244 goto err_parse_key;
aaa31047 6245 }
7b225d0b
PNA		 6246
6247 if (nla[NFTA_SET_ELEM_KEY_END]) {
6248 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6249 nla[NFTA_SET_ELEM_KEY_END]);
6250 if (err < 0)
6251 goto err_parse_key;
6252
c39ba4de
PNA		 6253 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6254 if (err < 0)
6255 goto err_parse_key_end;
7b225d0b
PNA		 6256 }
6257
c3e1b005 6258 if (timeout > 0) {
c39ba4de
PNA		 6259 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6260 if (err < 0)
6261 goto err_parse_key_end;
6262
123b9961 6263 if (timeout != READ_ONCE(set->timeout)) {
c39ba4de
PNA		 6264 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6265 if (err < 0)
6266 goto err_parse_key_end;
6267 }
c3e1b005 6268 }
fe2811eb 6269
664899e8
PNA		 6270 if (num_exprs) {
6271 for (i = 0; i < num_exprs; i++)
563125a7
PNA		 6272 size += expr_array[i]->ops->size;
6273
c39ba4de
PNA		 6274 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6275 sizeof(struct nft_set_elem_expr) + size);
6276 if (err < 0)
6277 goto err_parse_key_end;
563125a7 6278 }
40944452 6279
8aeff920 6280 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4d44175a
FW		 6281 obj = nft_obj_lookup(ctx->net, ctx->table,
6282 nla[NFTA_SET_ELEM_OBJREF],
cac20fcd 6283 set->objtype, genmask);
8aeff920
PNA		 6284 if (IS_ERR(obj)) {
6285 err = PTR_ERR(obj);
7b225d0b 6286 goto err_parse_key_end;
8aeff920 6287 }
c39ba4de
PNA		 6288 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6289 if (err < 0)
6290 goto err_parse_key_end;
8aeff920
PNA		 6291 }
6292
20a69341 6293 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
fdb9c405
PNA		 6294 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6295 nla[NFTA_SET_ELEM_DATA]);
20a69341 6296 if (err < 0)
7b225d0b 6297 goto err_parse_key_end;
20a69341 6298
20a69341
PM		 6299 dreg = nft_type_to_reg(set->dtype);
6300 list_for_each_entry(binding, &set->bindings, list) {
6301 struct nft_ctx bind_ctx = {
58c78e10 6302 .net = ctx->net,
36596dad 6303 .family = ctx->family,
20a69341 6304 .table = ctx->table,
7c95f6d8 6305 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 6306 };
6307
11113e19
PM		 6308 if (!(binding->flags & NFT_SET_MAP))
6309 continue;
6310
1ec10212 6311 err = nft_validate_register_store(&bind_ctx, dreg,
fdb9c405 6312 &elem.data.val,
20a1452c 6313 desc.type, desc.len);
20a69341 6314 if (err < 0)
7b225d0b 6315 goto err_parse_data;
a654de8f 6316
20a1452c 6317 if (desc.type == NFT_DATA_VERDICT &&
fdb9c405
PNA		 6318 (elem.data.val.verdict.code == NFT_GOTO ||
6319 elem.data.val.verdict.code == NFT_JUMP))
a654de8f
PNA		 6320 nft_validate_state_update(ctx->net,
6321 NFT_VALIDATE_NEED);
20a69341 6322 }
fe2811eb 6323
c39ba4de
PNA		 6324 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6325 if (err < 0)
6326 goto err_parse_data;
20a69341
PM		 6327 }
6328
68e942e8
PM		 6329 /* The full maximum length of userdata can exceed the maximum
6330 * offset value (U8_MAX) for following extensions, therefor it
6331 * must be the last extension added.
6332 */
6333 ulen = 0;
6334 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6335 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
c39ba4de
PNA		 6336 if (ulen > 0) {
6337 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6338 ulen);
6339 if (err < 0)
6340 goto err_parse_data;
6341 }
68e942e8
PM		 6342 }
6343
7b225d0b 6344 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
fdb9c405 6345 elem.key_end.val.data, elem.data.val.data,
33758c89 6346 timeout, expiration, GFP_KERNEL_ACCOUNT);
34aae2c2
PNA		 6347 if (IS_ERR(elem.priv)) {
6348 err = PTR_ERR(elem.priv);
7b225d0b 6349 goto err_parse_data;
34aae2c2 6350 }
fe2811eb
PM		 6351
6352 ext = nft_set_elem_ext(set, elem.priv);
6353 if (flags)
6354 *nft_set_ext_flags(ext) = flags;
34aae2c2 6355
68e942e8 6356 if (ulen > 0) {
34aae2c2
PNA		 6357 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6358 err = -EINVAL;
6359 goto err_elem_userdata;
6360 }
68e942e8
PM		 6361 udata = nft_set_ext_userdata(ext);
6362 udata->len = ulen - 1;
6363 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6364 }
8aeff920
PNA		 6365 if (obj) {
6366 *nft_set_ext_obj(ext) = obj;
6367 obj->use++;
6368 }
34aae2c2 6369 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
4d8f9065 6370 if (err < 0)
34aae2c2 6371 goto err_elem_free;
fe2811eb 6372
60319eb1 6373 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4d8f9065
PNA		 6374 if (trans == NULL) {
6375 err = -ENOMEM;
34aae2c2 6376 goto err_elem_free;
4d8f9065 6377 }
60319eb1 6378
69086658 6379 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
aaa31047
PNA		 6380
6381 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
c016c7e4
PNA		 6382 if (err) {
6383 if (err == -EEXIST) {
9744a6fc
PNA		 6384 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6385 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6386 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
77a92189 6387 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7b225d0b 6388 goto err_element_clash;
8aeff920
PNA		 6389 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6390 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6391 memcmp(nft_set_ext_data(ext),
6392 nft_set_ext_data(ext2), set->dlen) != 0) ||
6393 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6394 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6395 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
77a92189 6396 goto err_element_clash;
c016c7e4
PNA		 6397 else if (!(nlmsg_flags & NLM_F_EXCL))
6398 err = 0;
8c2d45b2
PNA		 6399 } else if (err == -ENOTEMPTY) {
6400 /* ENOTEMPTY reports overlapping between this element
6401 * and an existing one.
6402 */
6403 err = -EEXIST;
c016c7e4 6404 }
7b225d0b 6405 goto err_element_clash;
c016c7e4 6406 }
20a69341 6407
aaa31047 6408 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
35d0ac90
PNA		 6409 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6410 err = -ENFILE;
7b225d0b 6411 goto err_set_full;
35d0ac90
PNA		 6412 }
6413
60319eb1 6414 nft_trans_elem(trans) = elem;
0854db2a 6415 nft_trans_commit_list_add_tail(ctx->net, trans);
20a69341
PM		 6416 return 0;
6417
7b225d0b 6418err_set_full:
aaa31047 6419 nft_setelem_remove(ctx->net, set, &elem);
7b225d0b 6420err_element_clash:
60319eb1 6421 kfree(trans);
34aae2c2 6422err_elem_free:
b91d9036
TY		 6423 if (obj)
6424 obj->use--;
34aae2c2 6425err_elem_userdata:
475beb9c 6426 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7b225d0b 6427err_parse_data:
20a69341 6428 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fdb9c405 6429 nft_data_release(&elem.data.val, desc.type);
7b225d0b
PNA		 6430err_parse_key_end:
6431 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6432err_parse_key:
20a1452c 6433 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
40944452 6434err_set_elem_expr:
664899e8 6435 for (i = 0; i < num_exprs && expr_array[i]; i++)
8cfd9b0f
PNA		 6436 nft_expr_destroy(ctx, expr_array[i]);
6437err_set_elem_expr_clone:
20a69341
PM		 6438 return err;
6439}
6440
7dab8ee3
PNA		 6441static int nf_tables_newsetelem(struct sk_buff *skb,
6442 const struct nfnl_info *info,
6443 const struct nlattr * const nla[])
20a69341 6444{
7dab8ee3
PNA		 6445 struct nftables_pernet *nft_net = nft_pernet(info->net);
6446 struct netlink_ext_ack *extack = info->extack;
6447 u8 genmask = nft_genmask_next(info->net);
e2b750d7 6448 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 6449 struct net *net = info->net;
20a69341 6450 const struct nlattr *attr;
e2b750d7 6451 struct nft_table *table;
20a69341
PM		 6452 struct nft_set *set;
6453 struct nft_ctx ctx;
a654de8f 6454 int rem, err;
20a69341 6455
7d5570ca
PNA		 6456 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6457 return -EINVAL;
6458
e2b750d7
PNA		 6459 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6460 genmask, NETLINK_CB(skb).portid);
6461 if (IS_ERR(table)) {
6462 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6463 return PTR_ERR(table);
6464 }
20a69341 6465
e2b750d7 6466 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
a3073c17
PNA		 6467 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6468 if (IS_ERR(set))
6469 return PTR_ERR(set);
958bee14 6470
20a69341
PM		 6471 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6472 return -EBUSY;
6473
e2b750d7
PNA		 6474 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6475
20a69341 6476 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7dab8ee3 6477 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
b53c1166
PNA		 6478 if (err < 0) {
6479 NL_SET_BAD_ATTR(extack, attr);
a654de8f 6480 return err;
b53c1166 6481 }
20a69341 6482 }
a654de8f 6483
0854db2a 6484 if (nft_net->validate_state == NFT_VALIDATE_DO)
e2b750d7 6485 return nft_table_validate(net, table);
a654de8f
PNA		 6486
6487 return 0;
20a69341
PM		 6488}
6489
59105446
PNA		 6490/**
6491 * nft_data_hold - hold a nft_data item
6492 *
6493 * @data: struct nft_data to release
6494 * @type: type of data
6495 *
6496 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6497 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6498 * NFT_GOTO verdicts. This function must be called on active data objects
6499 * from the second phase of the commit protocol.
6500 */
bb7b40ae 6501void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446 6502{
d0e2c7de
PNA		 6503 struct nft_chain *chain;
6504 struct nft_rule *rule;
6505
59105446
PNA		 6506 if (type == NFT_DATA_VERDICT) {
6507 switch (data->verdict.code) {
6508 case NFT_JUMP:
6509 case NFT_GOTO:
d0e2c7de
PNA		 6510 chain = data->verdict.chain;
6511 chain->use++;
6512
6513 if (!nft_chain_is_bound(chain))
6514 break;
6515
6516 chain->table->use++;
6517 list_for_each_entry(rule, &chain->rules, list)
6518 chain->use++;
6519
6520 nft_chain_add(chain->table, chain);
59105446
PNA		 6521 break;
6522 }
6523 }
6524}
6525
f8bb7889
PNA		 6526static void nft_setelem_data_activate(const struct net *net,
6527 const struct nft_set *set,
6528 struct nft_set_elem *elem)
59105446
PNA		 6529{
6530 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6531
6532 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6533 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6534 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6535 (*nft_set_ext_obj(ext))->use++;
6536}
6537
f8bb7889
PNA		 6538static void nft_setelem_data_deactivate(const struct net *net,
6539 const struct nft_set *set,
6540 struct nft_set_elem *elem)
59105446
PNA		 6541{
6542 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6543
6544 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6545 nft_data_release(nft_set_ext_data(ext), set->dtype);
6546 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6547 (*nft_set_ext_obj(ext))->use--;
6548}
6549
60319eb1 6550static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 6551 const struct nlattr *attr)
6552{
6553 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 6554 struct nft_set_ext_tmpl tmpl;
20a69341 6555 struct nft_set_elem elem;
3971ca14 6556 struct nft_set_ext *ext;
60319eb1 6557 struct nft_trans *trans;
3971ca14 6558 u32 flags = 0;
20a69341
PM		 6559 int err;
6560
8cb08174
JB		 6561 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6562 nft_set_elem_policy, NULL);
20a69341 6563 if (err < 0)
20a1452c 6564 return err;
20a69341 6565
aaa31047
PNA		 6566 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6567 if (err < 0)
6568 return err;
6569
6570 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
20a1452c 6571 return -EINVAL;
20a69341 6572
88cccd90
PNA		 6573 if (!nft_setelem_valid_key_end(set, nla, flags))
6574 return -EINVAL;
6575
3971ca14
PNA		 6576 nft_set_ext_prepare(&tmpl);
6577
c39ba4de
PNA		 6578 if (flags != 0) {
6579 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6580 if (err < 0)
6581 return err;
6582 }
3971ca14 6583
aaa31047
PNA		 6584 if (nla[NFTA_SET_ELEM_KEY]) {
6585 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6586 nla[NFTA_SET_ELEM_KEY]);
6587 if (err < 0)
6588 return err;
20a69341 6589
c39ba4de
PNA		 6590 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6591 if (err < 0)
6592 goto fail_elem;
aaa31047 6593 }
3971ca14 6594
7b225d0b
PNA		 6595 if (nla[NFTA_SET_ELEM_KEY_END]) {
6596 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6597 nla[NFTA_SET_ELEM_KEY_END]);
6598 if (err < 0)
c39ba4de 6599 goto fail_elem;
7b225d0b 6600
c39ba4de
PNA		 6601 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6602 if (err < 0)
6603 goto fail_elem_key_end;
7b225d0b
PNA		 6604 }
6605
3971ca14 6606 err = -ENOMEM;
7b225d0b
PNA		 6607 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6608 elem.key_end.val.data, NULL, 0, 0,
33758c89 6609 GFP_KERNEL_ACCOUNT);
34aae2c2
PNA		 6610 if (IS_ERR(elem.priv)) {
6611 err = PTR_ERR(elem.priv);
c39ba4de 6612 goto fail_elem_key_end;
34aae2c2 6613 }
3971ca14
PNA		 6614
6615 ext = nft_set_elem_ext(set, elem.priv);
6616 if (flags)
6617 *nft_set_ext_flags(ext) = flags;
6618
60319eb1 6619 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
20a1452c
PNA		 6620 if (trans == NULL)
6621 goto fail_trans;
20a69341 6622
aaa31047
PNA		 6623 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6624 if (err < 0)
20a1452c 6625 goto fail_ops;
cc02e457 6626
f8bb7889 6627 nft_setelem_data_deactivate(ctx->net, set, &elem);
59105446 6628
60319eb1 6629 nft_trans_elem(trans) = elem;
0854db2a 6630 nft_trans_commit_list_add_tail(ctx->net, trans);
0dc13625 6631 return 0;
cc02e457 6632
20a1452c 6633fail_ops:
cc02e457 6634 kfree(trans);
20a1452c 6635fail_trans:
3971ca14 6636 kfree(elem.priv);
c39ba4de
PNA		 6637fail_elem_key_end:
6638 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
20a1452c
PNA		 6639fail_elem:
6640 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
20a69341
PM		 6641 return err;
6642}
6643
e6ba7cb6
PNA		 6644static int nft_setelem_flush(const struct nft_ctx *ctx,
6645 struct nft_set *set,
6646 const struct nft_set_iter *iter,
6647 struct nft_set_elem *elem)
8411b644
PNA		 6648{
6649 struct nft_trans *trans;
6650 int err;
6651
6652 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6653 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6654 if (!trans)
6655 return -ENOMEM;
6656
1ba1c414 6657 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 6658 err = -ENOENT;
6659 goto err1;
6660 }
b2c11e4b 6661 set->ndeact++;
8411b644 6662
f8bb7889 6663 nft_setelem_data_deactivate(ctx->net, set, elem);
de70185d
PNA		 6664 nft_trans_elem_set(trans) = set;
6665 nft_trans_elem(trans) = *elem;
0854db2a 6666 nft_trans_commit_list_add_tail(ctx->net, trans);
8411b644
PNA		 6667
6668 return 0;
6669err1:
6670 kfree(trans);
6671 return err;
6672}
6673
aaa31047
PNA		 6674static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6675 struct nft_set *set,
6676 struct nft_set_elem *elem)
6677{
6678 struct nft_trans *trans;
6679
6680 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6681 sizeof(struct nft_trans_elem), GFP_KERNEL);
6682 if (!trans)
6683 return -ENOMEM;
6684
6685 nft_setelem_data_deactivate(ctx->net, set, elem);
6686 nft_trans_elem_set(trans) = set;
6687 nft_trans_elem(trans) = *elem;
6688 nft_trans_commit_list_add_tail(ctx->net, trans);
6689
6690 return 0;
6691}
6692
6693static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6694 struct nft_set *set)
6695{
6696 u8 genmask = nft_genmask_next(ctx->net);
6697 struct nft_set_elem_catchall *catchall;
6698 struct nft_set_elem elem;
6699 struct nft_set_ext *ext;
6700 int ret = 0;
6701
6702 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6703 ext = nft_set_elem_ext(set, catchall->elem);
6704 if (!nft_set_elem_active(ext, genmask) ||
6705 nft_set_elem_mark_busy(ext))
6706 continue;
6707
6708 elem.priv = catchall->elem;
6709 ret = __nft_set_catchall_flush(ctx, set, &elem);
6710 if (ret < 0)
6711 break;
6712 }
6713
6714 return ret;
6715}
6716
e6ba7cb6
PNA		 6717static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6718{
6719 struct nft_set_iter iter = {
6720 .genmask = genmask,
6721 .fn = nft_setelem_flush,
6722 };
6723
6724 set->ops->walk(ctx, set, &iter);
aaa31047
PNA		 6725 if (!iter.err)
6726 iter.err = nft_set_catchall_flush(ctx, set);
e6ba7cb6
PNA		 6727
6728 return iter.err;
6729}
6730
7dab8ee3
PNA		 6731static int nf_tables_delsetelem(struct sk_buff *skb,
6732 const struct nfnl_info *info,
6733 const struct nlattr * const nla[])
20a69341 6734{
7dab8ee3
PNA		 6735 struct netlink_ext_ack *extack = info->extack;
6736 u8 genmask = nft_genmask_next(info->net);
e2b750d7 6737 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 6738 struct net *net = info->net;
20a69341 6739 const struct nlattr *attr;
e2b750d7 6740 struct nft_table *table;
20a69341
PM		 6741 struct nft_set *set;
6742 struct nft_ctx ctx;
60319eb1 6743 int rem, err = 0;
20a69341 6744
e2b750d7
PNA		 6745 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6746 genmask, NETLINK_CB(skb).portid);
6747 if (IS_ERR(table)) {
6748 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6749 return PTR_ERR(table);
6750 }
20a69341 6751
e2b750d7 6752 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 6753 if (IS_ERR(set))
6754 return PTR_ERR(set);
6755 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6756 return -EBUSY;
6757
e2b750d7
PNA		 6758 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6759
e6ba7cb6
PNA		 6760 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6761 return nft_set_flush(&ctx, set, genmask);
8411b644 6762
20a69341
PM		 6763 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6764 err = nft_del_setelem(&ctx, set, attr);
f80a612d
FFM		 6765 if (err == -ENOENT &&
6766 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6767 continue;
6768
b53c1166
PNA		 6769 if (err < 0) {
6770 NL_SET_BAD_ATTR(extack, attr);
60319eb1 6771 break;
b53c1166 6772 }
20a69341 6773 }
60319eb1 6774 return err;
20a69341
PM		 6775}
6776
cfed7e1b
PM		 6777void nft_set_gc_batch_release(struct rcu_head *rcu)
6778{
6779 struct nft_set_gc_batch *gcb;
6780 unsigned int i;
6781
6782 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6783 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 6784 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 6785 kfree(gcb);
6786}
cfed7e1b
PM		 6787
6788struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6789 gfp_t gfp)
6790{
6791 struct nft_set_gc_batch *gcb;
6792
6793 gcb = kzalloc(sizeof(*gcb), gfp);
6794 if (gcb == NULL)
6795 return gcb;
6796 gcb->head.set = set;
6797 return gcb;
6798}
cfed7e1b 6799
e5009240
PNA		 6800/*
6801 * Stateful objects
6802 */
6803
6804/**
6805 * nft_register_obj- register nf_tables stateful object type
3db86c39 6806 * @obj_type: object type
e5009240
PNA		 6807 *
6808 * Registers the object type for use with nf_tables. Returns zero on
6809 * success or a negative errno code otherwise.
6810 */
6811int nft_register_obj(struct nft_object_type *obj_type)
6812{
6813 if (obj_type->type == NFT_OBJECT_UNSPEC)
6814 return -EINVAL;
6815
6816 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6817 list_add_rcu(&obj_type->list, &nf_tables_objects);
6818 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6819 return 0;
6820}
6821EXPORT_SYMBOL_GPL(nft_register_obj);
6822
6823/**
6824 * nft_unregister_obj - unregister nf_tables object type
3db86c39 6825 * @obj_type: object type
e5009240
PNA		 6826 *
6827 * Unregisters the object type for use with nf_tables.
6828 */
6829void nft_unregister_obj(struct nft_object_type *obj_type)
6830{
6831 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6832 list_del_rcu(&obj_type->list);
6833 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6834}
6835EXPORT_SYMBOL_GPL(nft_unregister_obj);
6836
4d44175a
FW		 6837struct nft_object *nft_obj_lookup(const struct net *net,
6838 const struct nft_table *table,
cac20fcd
PNA		 6839 const struct nlattr *nla, u32 objtype,
6840 u8 genmask)
e5009240 6841{
4d44175a
FW		 6842 struct nft_object_hash_key k = { .table = table };
6843 char search[NFT_OBJ_MAXNAMELEN];
6844 struct rhlist_head *tmp, *list;
e5009240
PNA		 6845 struct nft_object *obj;
6846
872f6903 6847 nla_strscpy(search, nla, sizeof(search));
4d44175a
FW		 6848 k.name = search;
6849
6850 WARN_ON_ONCE(!rcu_read_lock_held() &&
6851 !lockdep_commit_lock_is_held(net));
6852
6853 rcu_read_lock();
6854 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6855 if (!list)
6856 goto out;
6857
6858 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6859 if (objtype == obj->ops->type->type &&
6860 nft_active_genmask(obj, genmask)) {
6861 rcu_read_unlock();
e5009240 6862 return obj;
4d44175a 6863 }
e5009240 6864 }
4d44175a
FW		 6865out:
6866 rcu_read_unlock();
e5009240
PNA		 6867 return ERR_PTR(-ENOENT);
6868}
cac20fcd 6869EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 6870
cac20fcd
PNA		 6871static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6872 const struct nlattr *nla,
6873 u32 objtype, u8 genmask)
3ecbfd65
HS		 6874{
6875 struct nft_object *obj;
6876
6877 list_for_each_entry(obj, &table->objects, list) {
6878 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6879 objtype == obj->ops->type->type &&
6880 nft_active_genmask(obj, genmask))
6881 return obj;
6882 }
6883 return ERR_PTR(-ENOENT);
6884}
6885
e5009240 6886static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 6887 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6888 .len = NFT_TABLE_MAXNAMELEN - 1 },
6889 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6890 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 6891 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6892 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 6893 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
b131c964
JGG		 6894 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6895 .len = NFT_USERDATA_MAXLEN },
e5009240
PNA		 6896};
6897
84fba055
FW		 6898static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6899 const struct nft_object_type *type,
e5009240
PNA		 6900 const struct nlattr *attr)
6901{
5b4c6e38 6902 struct nlattr **tb;
dfc46034 6903 const struct nft_object_ops *ops;
e5009240 6904 struct nft_object *obj;
5b4c6e38
GS		 6905 int err = -ENOMEM;
6906
6907 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6908 if (!tb)
6909 goto err1;
e5009240
PNA		 6910
6911 if (attr) {
8cb08174
JB		 6912 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6913 type->policy, NULL);
e5009240 6914 if (err < 0)
5b4c6e38 6915 goto err2;
e5009240
PNA		 6916 } else {
6917 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6918 }
6919
dfc46034
PBG		 6920 if (type->select_ops) {
6921 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6922 if (IS_ERR(ops)) {
6923 err = PTR_ERR(ops);
5b4c6e38 6924 goto err2;
dfc46034
PBG		 6925 }
6926 } else {
6927 ops = type->ops;
6928 }
6929
e5009240 6930 err = -ENOMEM;
33758c89 6931 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
5b4c6e38
GS		 6932 if (!obj)
6933 goto err2;
e5009240 6934
dfc46034 6935 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 6936 if (err < 0)
5b4c6e38 6937 goto err3;
e5009240 6938
dfc46034
PBG		 6939 obj->ops = ops;
6940
5b4c6e38 6941 kfree(tb);
e5009240 6942 return obj;
5b4c6e38 6943err3:
e5009240 6944 kfree(obj);
5b4c6e38
GS		 6945err2:
6946 kfree(tb);
e5009240
PNA		 6947err1:
6948 return ERR_PTR(err);
6949}
6950
6951static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 6952 struct nft_object *obj, bool reset)
e5009240
PNA		 6953{
6954 struct nlattr *nest;
6955
ae0be8de 6956 nest = nla_nest_start_noflag(skb, attr);
e5009240
PNA		 6957 if (!nest)
6958 goto nla_put_failure;
dfc46034 6959 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 6960 goto nla_put_failure;
6961 nla_nest_end(skb, nest);
6962 return 0;
6963
6964nla_put_failure:
6965 return -1;
6966}
6967
6968static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6969{
6970 const struct nft_object_type *type;
6971
6972 list_for_each_entry(type, &nf_tables_objects, list) {
6973 if (objtype == type->type)
6974 return type;
6975 }
6976 return NULL;
6977}
6978
452238e8
FW		 6979static const struct nft_object_type *
6980nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 6981{
6982 const struct nft_object_type *type;
6983
6984 type = __nft_obj_type_get(objtype);
6985 if (type != NULL && try_module_get(type->owner))
6986 return type;
6987
f102d66b 6988 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 6989#ifdef CONFIG_MODULES
6990 if (type == NULL) {
eb014de4 6991 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
e5009240
PNA		 6992 return ERR_PTR(-EAGAIN);
6993 }
6994#endif
6995 return ERR_PTR(-ENOENT);
6996}
6997
d62d0ba9
FFM		 6998static int nf_tables_updobj(const struct nft_ctx *ctx,
6999 const struct nft_object_type *type,
7000 const struct nlattr *attr,
7001 struct nft_object *obj)
7002{
7003 struct nft_object *newobj;
7004 struct nft_trans *trans;
dad3bdee
FW		 7005 int err = -ENOMEM;
7006
7007 if (!try_module_get(type->owner))
7008 return -ENOENT;
d62d0ba9
FFM		 7009
7010 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7011 sizeof(struct nft_trans_obj));
7012 if (!trans)
dad3bdee 7013 goto err_trans;
d62d0ba9
FFM		 7014
7015 newobj = nft_obj_init(ctx, type, attr);
7016 if (IS_ERR(newobj)) {
7017 err = PTR_ERR(newobj);
b74ae961 7018 goto err_free_trans;
d62d0ba9
FFM		 7019 }
7020
7021 nft_trans_obj(trans) = obj;
7022 nft_trans_obj_update(trans) = true;
7023 nft_trans_obj_newobj(trans) = newobj;
0854db2a 7024 nft_trans_commit_list_add_tail(ctx->net, trans);
d62d0ba9
FFM		 7025
7026 return 0;
b74ae961
DC		 7027
7028err_free_trans:
d62d0ba9 7029 kfree(trans);
dad3bdee
FW		 7030err_trans:
7031 module_put(type->owner);
d62d0ba9
FFM		 7032 return err;
7033}
7034
7dab8ee3
PNA		 7035static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7036 const struct nlattr * const nla[])
e5009240 7037{
7dab8ee3
PNA		 7038 struct netlink_ext_ack *extack = info->extack;
7039 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 7040 u8 family = info->nfmsg->nfgen_family;
e5009240 7041 const struct nft_object_type *type;
7dab8ee3 7042 struct net *net = info->net;
e5009240
PNA		 7043 struct nft_table *table;
7044 struct nft_object *obj;
7045 struct nft_ctx ctx;
7046 u32 objtype;
7047 int err;
7048
7049 if (!nla[NFTA_OBJ_TYPE] ||
7050 !nla[NFTA_OBJ_NAME] ||
7051 !nla[NFTA_OBJ_DATA])
7052 return -EINVAL;
7053
6001a930
PNA		 7054 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7055 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 7056 if (IS_ERR(table)) {
7057 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 7058 return PTR_ERR(table);
36dd1bcc 7059 }
e5009240
PNA		 7060
7061 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 7062 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 7063 if (IS_ERR(obj)) {
7064 err = PTR_ERR(obj);
36dd1bcc
PNA		 7065 if (err != -ENOENT) {
7066 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 7067 return err;
36dd1bcc 7068 }
1a28ad74 7069 } else {
7dab8ee3 7070 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 7071 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 7072 return -EEXIST;
36dd1bcc 7073 }
7dab8ee3 7074 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
d62d0ba9
FFM		 7075 return -EOPNOTSUPP;
7076
fd57d0cb 7077 type = __nft_obj_type_get(objtype);
dac7f50a
AT		 7078 if (WARN_ON_ONCE(!type))
7079 return -ENOENT;
7080
7dab8ee3 7081 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
d62d0ba9
FFM		 7082
7083 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
e5009240
PNA		 7084 }
7085
7dab8ee3 7086 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
e5009240 7087
452238e8 7088 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 7089 if (IS_ERR(type))
7090 return PTR_ERR(type);
7091
84fba055 7092 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 7093 if (IS_ERR(obj)) {
7094 err = PTR_ERR(obj);
b131c964 7095 goto err_init;
e5009240 7096 }
d152159b 7097 obj->key.table = table;
3ecbfd65
HS		 7098 obj->handle = nf_tables_alloc_handle(table);
7099
33758c89 7100 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
d152159b 7101 if (!obj->key.name) {
61509575 7102 err = -ENOMEM;
b131c964
JGG		 7103 goto err_strdup;
7104 }
7105
7106 if (nla[NFTA_OBJ_USERDATA]) {
af0acf22 7107 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
b131c964
JGG		 7108 if (obj->udata == NULL)
7109 goto err_userdata;
7110
85db827a 7111 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
61509575 7112 }
e5009240
PNA		 7113
7114 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7115 if (err < 0)
b131c964 7116 goto err_trans;
e5009240 7117
4d44175a
FW		 7118 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7119 nft_objname_ht_params);
7120 if (err < 0)
b131c964 7121 goto err_obj_ht;
4d44175a 7122
e5009240
PNA		 7123 list_add_tail_rcu(&obj->list, &table->objects);
7124 table->use++;
7125 return 0;
b131c964 7126err_obj_ht:
4d44175a
FW		 7127 /* queued in transaction log */
7128 INIT_LIST_HEAD(&obj->list);
7129 return err;
b131c964 7130err_trans:
b131c964 7131 kfree(obj->udata);
85dfd816
PNA		 7132err_userdata:
7133 kfree(obj->key.name);
b131c964 7134err_strdup:
dfc46034 7135 if (obj->ops->destroy)
00bfb320 7136 obj->ops->destroy(&ctx, obj);
e5009240 7137 kfree(obj);
b131c964 7138err_init:
e5009240
PNA		 7139 module_put(type->owner);
7140 return err;
7141}
7142
7143static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7144 u32 portid, u32 seq, int event, u32 flags,
7145 int family, const struct nft_table *table,
43da04a5 7146 struct nft_object *obj, bool reset)
e5009240 7147{
e5009240
PNA		 7148 struct nlmsghdr *nlh;
7149
dedb67c4 7150 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 7151 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7152 NFNETLINK_V0, nft_base_seq(net));
7153 if (!nlh)
e5009240
PNA		 7154 goto nla_put_failure;
7155
e5009240 7156 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
d152159b 7157 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
dfc46034 7158 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 7159 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 7160 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7161 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7162 NFTA_OBJ_PAD))
e5009240
PNA		 7163 goto nla_put_failure;
7164
b131c964
JGG		 7165 if (obj->udata &&
7166 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7167 goto nla_put_failure;
7168
e5009240
PNA		 7169 nlmsg_end(skb, nlh);
7170 return 0;
7171
7172nla_put_failure:
7173 nlmsg_trim(skb, nlh);
7174 return -1;
7175}
7176
a9fea2a3 7177struct nft_obj_filter {
e46abbcc 7178 char *table;
a9fea2a3
PNA		 7179 u32 type;
7180};
7181
e5009240
PNA		 7182static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7183{
7184 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 7185 const struct nft_table *table;
e5009240 7186 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 7187 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 7188 struct net *net = sock_net(skb->sk);
7189 int family = nfmsg->nfgen_family;
0854db2a 7190 struct nftables_pernet *nft_net;
43da04a5
PNA		 7191 struct nft_object *obj;
7192 bool reset = false;
7193
7194 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7195 reset = true;
e5009240
PNA		 7196
7197 rcu_read_lock();
d59d2f82 7198 nft_net = nft_pernet(net);
34002783 7199 cb->seq = READ_ONCE(nft_net->base_seq);
e5009240 7200
0854db2a 7201 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 7202 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 7203 continue;
7204
36596dad
PNA		 7205 list_for_each_entry_rcu(obj, &table->objects, list) {
7206 if (!nft_is_active(net, obj))
7207 goto cont;
7208 if (idx < s_idx)
7209 goto cont;
7210 if (idx > s_idx)
7211 memset(&cb->args[1], 0,
7212 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 7213 if (filter && filter->table &&
36596dad
PNA		 7214 strcmp(filter->table, table->name))
7215 goto cont;
7216 if (filter &&
7217 filter->type != NFT_OBJECT_UNSPEC &&
7218 obj->ops->type->type != filter->type)
7219 goto cont;
8e6cf365 7220 if (reset) {
68df2ed5 7221 char *buf = kasprintf(GFP_ATOMIC,
c520292f 7222 "%s:%u",
8e6cf365 7223 table->name,
0854db2a 7224 nft_net->base_seq);
8e6cf365
RGB		 7225
7226 audit_log_nfcfg(buf,
7227 family,
7228 obj->handle,
14224039 7229 AUDIT_NFT_OP_OBJ_RESET,
68df2ed5 7230 GFP_ATOMIC);
8e6cf365
RGB		 7231 kfree(buf);
7232 }
7233
36596dad
PNA		 7234 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7235 cb->nlh->nlmsg_seq,
7236 NFT_MSG_NEWOBJ,
7237 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 7238 table->family, table,
36596dad
PNA		 7239 obj, reset) < 0)
7240 goto done;
e5009240 7241
36596dad 7242 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 7243cont:
36596dad 7244 idx++;
e5009240
PNA		 7245 }
7246 }
7247done:
7248 rcu_read_unlock();
7249
7250 cb->args[0] = idx;
7251 return skb->len;
7252}
7253
90fd131a 7254static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 7255{
90fd131a
FW		 7256 const struct nlattr * const *nla = cb->data;
7257 struct nft_obj_filter *filter = NULL;
e46abbcc 7258
90fd131a
FW		 7259 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7260 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7261 if (!filter)
7262 return -ENOMEM;
7263
7264 if (nla[NFTA_OBJ_TABLE]) {
7265 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7266 if (!filter->table) {
7267 kfree(filter);
7268 return -ENOMEM;
7269 }
7270 }
7271
7272 if (nla[NFTA_OBJ_TYPE])
7273 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 7274 }
a9fea2a3 7275
90fd131a 7276 cb->data = filter;
a9fea2a3
PNA		 7277 return 0;
7278}
7279
90fd131a 7280static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 7281{
90fd131a 7282 struct nft_obj_filter *filter = cb->data;
a9fea2a3 7283
90fd131a
FW		 7284 if (filter) {
7285 kfree(filter->table);
7286 kfree(filter);
e46abbcc 7287 }
a9fea2a3 7288
90fd131a 7289 return 0;
a9fea2a3
PNA		 7290}
7291
d9adf22a 7292/* called with rcu_read_lock held */
797d4980
PNA		 7293static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7294 const struct nlattr * const nla[])
e5009240 7295{
797d4980
PNA		 7296 struct netlink_ext_ack *extack = info->extack;
7297 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 7298 u8 family = info->nfmsg->nfgen_family;
e5009240 7299 const struct nft_table *table;
797d4980 7300 struct net *net = info->net;
e5009240
PNA		 7301 struct nft_object *obj;
7302 struct sk_buff *skb2;
43da04a5 7303 bool reset = false;
e5009240
PNA		 7304 u32 objtype;
7305 int err;
7306
797d4980 7307 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
e5009240 7308 struct netlink_dump_control c = {
90fd131a 7309 .start = nf_tables_dump_obj_start,
e5009240 7310 .dump = nf_tables_dump_obj,
a9fea2a3 7311 .done = nf_tables_dump_obj_done,
d9adf22a 7312 .module = THIS_MODULE,
90fd131a 7313 .data = (void *)nla,
e5009240 7314 };
a9fea2a3 7315
797d4980 7316 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
e5009240
PNA		 7317 }
7318
7319 if (!nla[NFTA_OBJ_NAME] ||
7320 !nla[NFTA_OBJ_TYPE])
7321 return -EINVAL;
7322
6001a930 7323 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
36dd1bcc
PNA		 7324 if (IS_ERR(table)) {
7325 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 7326 return PTR_ERR(table);
36dd1bcc 7327 }
e5009240
PNA		 7328
7329 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 7330 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 7331 if (IS_ERR(obj)) {
7332 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 7333 return PTR_ERR(obj);
36dd1bcc 7334 }
e5009240 7335
d9adf22a 7336 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 7337 if (!skb2)
7338 return -ENOMEM;
7339
797d4980 7340 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
43da04a5
PNA		 7341 reset = true;
7342
8e6cf365 7343 if (reset) {
0854db2a
FW		 7344 const struct nftables_pernet *nft_net;
7345 char *buf;
7346
d59d2f82 7347 nft_net = nft_pernet(net);
0854db2a 7348 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
8e6cf365
RGB		 7349
7350 audit_log_nfcfg(buf,
7351 family,
7352 obj->handle,
14224039 7353 AUDIT_NFT_OP_OBJ_RESET,
68df2ed5 7354 GFP_ATOMIC);
8e6cf365
RGB		 7355 kfree(buf);
7356 }
7357
e5009240 7358 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
797d4980 7359 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 7360 family, table, obj, reset);
e5009240 7361 if (err < 0)
ee921183 7362 goto err_fill_obj_info;
e5009240 7363
ee921183
PNA		 7364 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7365
7366err_fill_obj_info:
e5009240
PNA		 7367 kfree_skb(skb2);
7368 return err;
e5009240
PNA		 7369}
7370
00bfb320 7371static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 7372{
dfc46034 7373 if (obj->ops->destroy)
00bfb320 7374 obj->ops->destroy(ctx, obj);
e5009240 7375
dfc46034 7376 module_put(obj->ops->type->owner);
d152159b 7377 kfree(obj->key.name);
bc7a7082 7378 kfree(obj->udata);
e5009240
PNA		 7379 kfree(obj);
7380}
7381
7dab8ee3
PNA		 7382static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7383 const struct nlattr * const nla[])
e5009240 7384{
7dab8ee3
PNA		 7385 struct netlink_ext_ack *extack = info->extack;
7386 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 7387 u8 family = info->nfmsg->nfgen_family;
7dab8ee3 7388 struct net *net = info->net;
36dd1bcc 7389 const struct nlattr *attr;
e5009240
PNA		 7390 struct nft_table *table;
7391 struct nft_object *obj;
7392 struct nft_ctx ctx;
7393 u32 objtype;
7394
7395 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 7396 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 7397 return -EINVAL;
7398
6001a930
PNA		 7399 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7400 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 7401 if (IS_ERR(table)) {
7402 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 7403 return PTR_ERR(table);
36dd1bcc 7404 }
e5009240
PNA		 7405
7406 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 7407 if (nla[NFTA_OBJ_HANDLE]) {
7408 attr = nla[NFTA_OBJ_HANDLE];
7409 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7410 } else {
7411 attr = nla[NFTA_OBJ_NAME];
4d44175a 7412 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
36dd1bcc
PNA		 7413 }
7414
7415 if (IS_ERR(obj)) {
f80a612d
FFM		 7416 if (PTR_ERR(obj) == -ENOENT &&
7417 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7418 return 0;
7419
36dd1bcc 7420 NL_SET_BAD_ATTR(extack, attr);
e5009240 7421 return PTR_ERR(obj);
36dd1bcc
PNA		 7422 }
7423 if (obj->use > 0) {
7424 NL_SET_BAD_ATTR(extack, attr);
e5009240 7425 return -EBUSY;
36dd1bcc 7426 }
e5009240 7427
7dab8ee3 7428 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
e5009240
PNA		 7429
7430 return nft_delobj(&ctx, obj);
7431}
7432
d152159b 7433void nft_obj_notify(struct net *net, const struct nft_table *table,
25e94a99 7434 struct nft_object *obj, u32 portid, u32 seq, int event,
6fb721cf 7435 u16 flags, int family, int report, gfp_t gfp)
e5009240 7436{
d59d2f82 7437 struct nftables_pernet *nft_net = nft_pernet(net);
e5009240
PNA		 7438 struct sk_buff *skb;
7439 int err;
c520292f 7440 char *buf = kasprintf(gfp, "%s:%u",
0854db2a 7441 table->name, nft_net->base_seq);
8e6cf365
RGB		 7442
7443 audit_log_nfcfg(buf,
7444 family,
7445 obj->handle,
7446 event == NFT_MSG_NEWOBJ ?
c520292f
RGB		 7447 AUDIT_NFT_OP_OBJ_REGISTER :
7448 AUDIT_NFT_OP_OBJ_UNREGISTER,
68df2ed5 7449 gfp);
8e6cf365 7450 kfree(buf);
e5009240 7451
2599e989
PNA		 7452 if (!report &&
7453 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 7454 return;
e5009240 7455
2599e989 7456 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 7457 if (skb == NULL)
7458 goto err;
7459
6fb721cf
PNA		 7460 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7461 flags & (NLM_F_CREATE | NLM_F_EXCL),
7462 family, table, obj, false);
e5009240
PNA		 7463 if (err < 0) {
7464 kfree_skb(skb);
7465 goto err;
7466 }
7467
0854db2a 7468 nft_notify_enqueue(skb, report, &nft_net->notify_list);
25e94a99 7469 return;
e5009240 7470err:
25e94a99 7471 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 7472}
2599e989
PNA		 7473EXPORT_SYMBOL_GPL(nft_obj_notify);
7474
25e94a99
PNA		 7475static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7476 struct nft_object *obj, int event)
2599e989 7477{
25e94a99 7478 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6fb721cf 7479 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
2599e989 7480}
e5009240 7481
3b49e2e9
PNA		 7482/*
7483 * Flow tables
7484 */
7485void nft_register_flowtable_type(struct nf_flowtable_type *type)
7486{
7487 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7488 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7489 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7490}
7491EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7492
7493void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7494{
7495 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7496 list_del_rcu(&type->list);
7497 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7498}
7499EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7500
7501static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7502 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7503 .len = NFT_NAME_MAXLEN - 1 },
7504 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7505 .len = NFT_NAME_MAXLEN - 1 },
7506 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 7507 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8bb69f3b 7508 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
3b49e2e9
PNA		 7509};
7510
cac20fcd
PNA		 7511struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7512 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 7513{
7514 struct nft_flowtable *flowtable;
7515
d9adf22a 7516 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 7517 if (!nla_strcmp(nla, flowtable->name) &&
7518 nft_active_genmask(flowtable, genmask))
7519 return flowtable;
7520 }
7521 return ERR_PTR(-ENOENT);
7522}
cac20fcd 7523EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 7524
9b05b6e1
LGL		 7525void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7526 struct nft_flowtable *flowtable,
7527 enum nft_trans_phase phase)
7528{
7529 switch (phase) {
7530 case NFT_TRANS_PREPARE:
7531 case NFT_TRANS_ABORT:
7532 case NFT_TRANS_RELEASE:
7533 flowtable->use--;
954d8297 7534 fallthrough;
9b05b6e1
LGL		 7535 default:
7536 return;
7537 }
7538}
7539EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7540
ae0662f8 7541static struct nft_flowtable *
cac20fcd
PNA		 7542nft_flowtable_lookup_byhandle(const struct nft_table *table,
7543 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 7544{
7545 struct nft_flowtable *flowtable;
7546
7547 list_for_each_entry(flowtable, &table->flowtables, list) {
7548 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7549 nft_active_genmask(flowtable, genmask))
7550 return flowtable;
7551 }
7552 return ERR_PTR(-ENOENT);
7553}
7554
d9246a53
PNA		 7555struct nft_flowtable_hook {
7556 u32 num;
7557 int priority;
7558 struct list_head list;
7559};
7560
3b49e2e9
PNA		 7561static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7562 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7563 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7564 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7565};
7566
d9246a53
PNA		 7567static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7568 const struct nlattr *attr,
7569 struct nft_flowtable_hook *flowtable_hook,
5b6743fb 7570 struct nft_flowtable *flowtable, bool add)
3b49e2e9 7571{
3b49e2e9 7572 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
3f0465a9 7573 struct nft_hook *hook;
3b49e2e9 7574 int hooknum, priority;
3f0465a9 7575 int err;
3b49e2e9 7576
d9246a53
PNA		 7577 INIT_LIST_HEAD(&flowtable_hook->list);
7578
8cb08174
JB		 7579 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7580 nft_flowtable_hook_policy, NULL);
3b49e2e9
PNA		 7581 if (err < 0)
7582 return err;
7583
5b6743fb
PNA		 7584 if (add) {
7585 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7586 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7587 return -EINVAL;
3b49e2e9 7588
5b6743fb
PNA		 7589 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7590 if (hooknum != NF_NETDEV_INGRESS)
7591 return -EOPNOTSUPP;
7592
7593 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7594
7595 flowtable_hook->priority = priority;
7596 flowtable_hook->num = hooknum;
7597 } else {
7598 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7599 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7600 if (hooknum != flowtable->hooknum)
7601 return -EOPNOTSUPP;
7602 }
7603
7604 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7605 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7606 if (priority != flowtable->data.priority)
7607 return -EOPNOTSUPP;
7608 }
3b49e2e9 7609
5b6743fb
PNA		 7610 flowtable_hook->priority = flowtable->data.priority;
7611 flowtable_hook->num = flowtable->hooknum;
7612 }
3b49e2e9 7613
05abe445
PNA		 7614 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7615 err = nf_tables_parse_netdev_hooks(ctx->net,
7616 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7617 &flowtable_hook->list);
7618 if (err < 0)
7619 return err;
7620 }
3b49e2e9 7621
d9246a53 7622 list_for_each_entry(hook, &flowtable_hook->list, list) {
3f0465a9 7623 hook->ops.pf = NFPROTO_NETDEV;
5b6743fb
PNA		 7624 hook->ops.hooknum = flowtable_hook->num;
7625 hook->ops.priority = flowtable_hook->priority;
7626 hook->ops.priv = &flowtable->data;
7627 hook->ops.hook = flowtable->data.type->hook;
3b49e2e9
PNA		 7628 }
7629
3b49e2e9
PNA		 7630 return err;
7631}
7632
98319cb9 7633static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 7634{
7635 const struct nf_flowtable_type *type;
7636
7637 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 7638 if (family == type->family)
3b49e2e9
PNA		 7639 return type;
7640 }
7641 return NULL;
7642}
7643
452238e8
FW		 7644static const struct nf_flowtable_type *
7645nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 7646{
7647 const struct nf_flowtable_type *type;
7648
98319cb9 7649 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 7650 if (type != NULL && try_module_get(type->owner))
7651 return type;
7652
f102d66b 7653 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 7654#ifdef CONFIG_MODULES
7655 if (type == NULL) {
eb014de4 7656 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
3b49e2e9
PNA		 7657 return ERR_PTR(-EAGAIN);
7658 }
7659#endif
7660 return ERR_PTR(-ENOENT);
7661}
7662
5acab914 7663/* Only called from error and netdev event paths. */
ff4bf2f4
PNA		 7664static void nft_unregister_flowtable_hook(struct net *net,
7665 struct nft_flowtable *flowtable,
7666 struct nft_hook *hook)
7667{
7668 nf_unregister_net_hook(net, &hook->ops);
7669 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7670 FLOW_BLOCK_UNBIND);
7671}
7672
f9a43007
PNA		 7673static void __nft_unregister_flowtable_net_hooks(struct net *net,
7674 struct list_head *hook_list,
7675 bool release_netdev)
3b49e2e9 7676{
f9a43007 7677 struct nft_hook *hook, *next;
3b49e2e9 7678
f9a43007 7679 list_for_each_entry_safe(hook, next, hook_list, list) {
5acab914 7680 nf_unregister_net_hook(net, &hook->ops);
f9a43007
PNA		 7681 if (release_netdev) {
7682 list_del(&hook->list);
ab5e5c06 7683 kfree_rcu(hook, rcu);
f9a43007
PNA		 7684 }
7685 }
7686}
7687
7688static void nft_unregister_flowtable_net_hooks(struct net *net,
7689 struct list_head *hook_list)
7690{
7691 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
3f0465a9
PNA		 7692}
7693
7694static int nft_register_flowtable_net_hooks(struct net *net,
7695 struct nft_table *table,
f9382669 7696 struct list_head *hook_list,
3f0465a9
PNA		 7697 struct nft_flowtable *flowtable)
7698{
7699 struct nft_hook *hook, *hook2, *next;
7700 struct nft_flowtable *ft;
7701 int err, i = 0;
7702
f9382669 7703 list_for_each_entry(hook, hook_list, list) {
3f0465a9 7704 list_for_each_entry(ft, &table->flowtables, list) {
86fe2c19
PNA		 7705 if (!nft_is_active_next(net, ft))
7706 continue;
7707
3f0465a9
PNA		 7708 list_for_each_entry(hook2, &ft->hook_list, list) {
7709 if (hook->ops.dev == hook2->ops.dev &&
7710 hook->ops.pf == hook2->ops.pf) {
77a92189 7711 err = -EEXIST;
3f0465a9
PNA		 7712 goto err_unregister_net_hooks;
7713 }
7714 }
7715 }
3b49e2e9 7716
d7c03a9f 7717 err = flowtable->data.type->setup(&flowtable->data,
7718 hook->ops.dev,
7719 FLOW_BLOCK_BIND);
3f0465a9
PNA		 7720 if (err < 0)
7721 goto err_unregister_net_hooks;
7722
d7c03a9f 7723 err = nf_register_net_hook(net, &hook->ops);
7724 if (err < 0) {
7725 flowtable->data.type->setup(&flowtable->data,
7726 hook->ops.dev,
7727 FLOW_BLOCK_UNBIND);
7728 goto err_unregister_net_hooks;
7729 }
7730
3f0465a9 7731 i++;
3b49e2e9 7732 }
3f0465a9
PNA		 7733
7734 return 0;
7735
7736err_unregister_net_hooks:
f9382669 7737 list_for_each_entry_safe(hook, next, hook_list, list) {
3f0465a9
PNA		 7738 if (i-- <= 0)
7739 break;
7740
ff4bf2f4 7741 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 7742 list_del_rcu(&hook->list);
7743 kfree_rcu(hook, rcu);
7744 }
7745
7746 return err;
3b49e2e9
PNA		 7747}
7748
389a2cbc
PNA		 7749static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7750{
7751 struct nft_hook *hook, *next;
7752
7753 list_for_each_entry_safe(hook, next, hook_list, list) {
7754 list_del_rcu(&hook->list);
7755 kfree_rcu(hook, rcu);
7756 }
7757}
7758
78d9f48f
PNA		 7759static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7760 struct nft_flowtable *flowtable)
7761{
7762 const struct nlattr * const *nla = ctx->nla;
7763 struct nft_flowtable_hook flowtable_hook;
7764 struct nft_hook *hook, *next;
7765 struct nft_trans *trans;
7766 bool unregister = false;
7b35582c 7767 u32 flags;
78d9f48f
PNA		 7768 int err;
7769
7770 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7771 &flowtable_hook, flowtable, false);
78d9f48f
PNA		 7772 if (err < 0)
7773 return err;
7774
7775 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7776 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7777 list_del(&hook->list);
7778 kfree(hook);
7779 }
7780 }
7781
7b35582c
PNA		 7782 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7783 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
c271cc9f
PNA		 7784 if (flags & ~NFT_FLOWTABLE_MASK) {
7785 err = -EOPNOTSUPP;
7786 goto err_flowtable_update_hook;
7787 }
7b35582c 7788 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
c271cc9f
PNA		 7789 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7790 err = -EOPNOTSUPP;
7791 goto err_flowtable_update_hook;
7792 }
7b35582c
PNA		 7793 } else {
7794 flags = flowtable->data.flags;
7795 }
7796
78d9f48f
PNA		 7797 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7798 &flowtable_hook.list, flowtable);
7799 if (err < 0)
7800 goto err_flowtable_update_hook;
7801
7802 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7803 sizeof(struct nft_trans_flowtable));
7804 if (!trans) {
7805 unregister = true;
7806 err = -ENOMEM;
7807 goto err_flowtable_update_hook;
7808 }
7809
7b35582c 7810 nft_trans_flowtable_flags(trans) = flags;
78d9f48f
PNA		 7811 nft_trans_flowtable(trans) = flowtable;
7812 nft_trans_flowtable_update(trans) = true;
7813 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7814 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7815
0854db2a 7816 nft_trans_commit_list_add_tail(ctx->net, trans);
78d9f48f
PNA		 7817
7818 return 0;
7819
7820err_flowtable_update_hook:
7821 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7822 if (unregister)
7823 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7824 list_del_rcu(&hook->list);
7825 kfree_rcu(hook, rcu);
7826 }
7827
7828 return err;
7829
7830}
7831
7dab8ee3
PNA		 7832static int nf_tables_newflowtable(struct sk_buff *skb,
7833 const struct nfnl_info *info,
7834 const struct nlattr * const nla[])
3b49e2e9 7835{
7dab8ee3 7836 struct netlink_ext_ack *extack = info->extack;
d9246a53 7837 struct nft_flowtable_hook flowtable_hook;
7dab8ee3 7838 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 7839 u8 family = info->nfmsg->nfgen_family;
3b49e2e9 7840 const struct nf_flowtable_type *type;
3f0465a9
PNA		 7841 struct nft_flowtable *flowtable;
7842 struct nft_hook *hook, *next;
7dab8ee3 7843 struct net *net = info->net;
3b49e2e9
PNA		 7844 struct nft_table *table;
7845 struct nft_ctx ctx;
3f0465a9 7846 int err;
3b49e2e9
PNA		 7847
7848 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7849 !nla[NFTA_FLOWTABLE_NAME] ||
7850 !nla[NFTA_FLOWTABLE_HOOK])
7851 return -EINVAL;
7852
cac20fcd 7853 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 7854 genmask, NETLINK_CB(skb).portid);
36dd1bcc
PNA		 7855 if (IS_ERR(table)) {
7856 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 7857 return PTR_ERR(table);
36dd1bcc 7858 }
3b49e2e9 7859
cac20fcd
PNA		 7860 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7861 genmask);
3b49e2e9
PNA		 7862 if (IS_ERR(flowtable)) {
7863 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 7864 if (err != -ENOENT) {
7865 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 7866 return err;
36dd1bcc 7867 }
3b49e2e9 7868 } else {
7dab8ee3 7869 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
36dd1bcc 7870 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 7871 return -EEXIST;
36dd1bcc 7872 }
3b49e2e9 7873
7dab8ee3 7874 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
78d9f48f 7875
7dab8ee3 7876 return nft_flowtable_update(&ctx, info->nlh, flowtable);
3b49e2e9
PNA		 7877 }
7878
7dab8ee3 7879 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
3b49e2e9 7880
33758c89 7881 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
3b49e2e9
PNA		 7882 if (!flowtable)
7883 return -ENOMEM;
7884
7885 flowtable->table = table;
3ecbfd65 7886 flowtable->handle = nf_tables_alloc_handle(table);
3f0465a9 7887 INIT_LIST_HEAD(&flowtable->hook_list);
3ecbfd65 7888
33758c89 7889 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
3b49e2e9
PNA		 7890 if (!flowtable->name) {
7891 err = -ENOMEM;
7892 goto err1;
7893 }
7894
452238e8 7895 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 7896 if (IS_ERR(type)) {
7897 err = PTR_ERR(type);
7898 goto err2;
7899 }
7900
8bb69f3b
PNA		 7901 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7902 flowtable->data.flags =
7903 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7e6136f1
PNA		 7904 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7905 err = -EOPNOTSUPP;
8bb69f3b 7906 goto err3;
7e6136f1 7907 }
8bb69f3b
PNA		 7908 }
7909
7910 write_pnet(&flowtable->data.net, net);
3b49e2e9 7911 flowtable->data.type = type;
a268de77 7912 err = type->init(&flowtable->data);
3b49e2e9
PNA		 7913 if (err < 0)
7914 goto err3;
7915
d9246a53 7916 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7917 &flowtable_hook, flowtable, true);
3b49e2e9 7918 if (err < 0)
a268de77 7919 goto err4;
3b49e2e9 7920
d9246a53
PNA		 7921 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7922 flowtable->data.priority = flowtable_hook.priority;
7923 flowtable->hooknum = flowtable_hook.num;
7924
f9382669
PNA		 7925 err = nft_register_flowtable_net_hooks(ctx.net, table,
7926 &flowtable->hook_list,
7927 flowtable);
2d285f26 7928 if (err < 0) {
389a2cbc 7929 nft_flowtable_hooks_destroy(&flowtable->hook_list);
3f0465a9 7930 goto err4;
2d285f26 7931 }
3b49e2e9
PNA		 7932
7933 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7934 if (err < 0)
3f0465a9 7935 goto err5;
3b49e2e9
PNA		 7936
7937 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7938 table->use++;
7939
7940 return 0;
a268de77 7941err5:
3f0465a9 7942 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
ff4bf2f4 7943 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 7944 list_del_rcu(&hook->list);
7945 kfree_rcu(hook, rcu);
7946 }
a268de77
FF		 7947err4:
7948 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 7949err3:
7950 module_put(type->owner);
7951err2:
7952 kfree(flowtable->name);
7953err1:
7954 kfree(flowtable);
7955 return err;
7956}
7957
3003055f
PNA		 7958static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7959{
7960 struct nft_hook *this, *next;
7961
7962 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7963 list_del(&this->list);
7964 kfree(this);
7965 }
7966}
7967
abadb2f8
PNA		 7968static int nft_delflowtable_hook(struct nft_ctx *ctx,
7969 struct nft_flowtable *flowtable)
7970{
7971 const struct nlattr * const *nla = ctx->nla;
7972 struct nft_flowtable_hook flowtable_hook;
b6d9014a 7973 LIST_HEAD(flowtable_del_list);
3003055f 7974 struct nft_hook *this, *hook;
abadb2f8
PNA		 7975 struct nft_trans *trans;
7976 int err;
7977
7978 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7979 &flowtable_hook, flowtable, false);
abadb2f8
PNA		 7980 if (err < 0)
7981 return err;
7982
3003055f 7983 list_for_each_entry(this, &flowtable_hook.list, list) {
abadb2f8
PNA		 7984 hook = nft_hook_list_find(&flowtable->hook_list, this);
7985 if (!hook) {
7986 err = -ENOENT;
7987 goto err_flowtable_del_hook;
7988 }
b6d9014a 7989 list_move(&hook->list, &flowtable_del_list);
abadb2f8
PNA		 7990 }
7991
7992 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7993 sizeof(struct nft_trans_flowtable));
3003055f
PNA		 7994 if (!trans) {
7995 err = -ENOMEM;
7996 goto err_flowtable_del_hook;
7997 }
abadb2f8
PNA		 7998
7999 nft_trans_flowtable(trans) = flowtable;
8000 nft_trans_flowtable_update(trans) = true;
8001 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
b6d9014a 8002 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
3003055f 8003 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8 8004
0854db2a 8005 nft_trans_commit_list_add_tail(ctx->net, trans);
abadb2f8
PNA		 8006
8007 return 0;
8008
8009err_flowtable_del_hook:
b6d9014a 8010 list_splice(&flowtable_del_list, &flowtable->hook_list);
3003055f 8011 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8
PNA		 8012
8013 return err;
8014}
8015
7dab8ee3
PNA		 8016static int nf_tables_delflowtable(struct sk_buff *skb,
8017 const struct nfnl_info *info,
8018 const struct nlattr * const nla[])
3b49e2e9 8019{
7dab8ee3
PNA		 8020 struct netlink_ext_ack *extack = info->extack;
8021 u8 genmask = nft_genmask_next(info->net);
ef4b65e5 8022 u8 family = info->nfmsg->nfgen_family;
3b49e2e9 8023 struct nft_flowtable *flowtable;
7dab8ee3 8024 struct net *net = info->net;
36dd1bcc 8025 const struct nlattr *attr;
3b49e2e9
PNA		 8026 struct nft_table *table;
8027 struct nft_ctx ctx;
8028
e603ea4b
PNA		 8029 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8030 (!nla[NFTA_FLOWTABLE_NAME] &&
8031 !nla[NFTA_FLOWTABLE_HANDLE]))
8032 return -EINVAL;
8033
cac20fcd 8034 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 8035 genmask, NETLINK_CB(skb).portid);
36dd1bcc
PNA		 8036 if (IS_ERR(table)) {
8037 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 8038 return PTR_ERR(table);
36dd1bcc 8039 }
3b49e2e9 8040
36dd1bcc
PNA		 8041 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8042 attr = nla[NFTA_FLOWTABLE_HANDLE];
8043 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8044 } else {
8045 attr = nla[NFTA_FLOWTABLE_NAME];
8046 flowtable = nft_flowtable_lookup(table, attr, genmask);
8047 }
8048
8049 if (IS_ERR(flowtable)) {
f80a612d
FFM		 8050 if (PTR_ERR(flowtable) == -ENOENT &&
8051 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8052 return 0;
8053
36dd1bcc
PNA		 8054 NL_SET_BAD_ATTR(extack, attr);
8055 return PTR_ERR(flowtable);
8056 }
abadb2f8 8057
7dab8ee3 8058 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
abadb2f8
PNA		 8059
8060 if (nla[NFTA_FLOWTABLE_HOOK])
8061 return nft_delflowtable_hook(&ctx, flowtable);
8062
36dd1bcc
PNA		 8063 if (flowtable->use > 0) {
8064 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 8065 return -EBUSY;
36dd1bcc 8066 }
3b49e2e9 8067
3b49e2e9
PNA		 8068 return nft_delflowtable(&ctx, flowtable);
8069}
8070
8071static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8072 u32 portid, u32 seq, int event,
8073 u32 flags, int family,
c42d8bda
PNA		 8074 struct nft_flowtable *flowtable,
8075 struct list_head *hook_list)
3b49e2e9
PNA		 8076{
8077 struct nlattr *nest, *nest_devs;
3f0465a9 8078 struct nft_hook *hook;
3b49e2e9 8079 struct nlmsghdr *nlh;
3b49e2e9
PNA		 8080
8081 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
19c28b13
PNA		 8082 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8083 NFNETLINK_V0, nft_base_seq(net));
8084 if (!nlh)
3b49e2e9
PNA		 8085 goto nla_put_failure;
8086
3b49e2e9
PNA		 8087 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8088 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 8089 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8090 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8bb69f3b
PNA		 8091 NFTA_FLOWTABLE_PAD) ||
8092 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
3b49e2e9
PNA		 8093 goto nla_put_failure;
8094
ae0be8de 8095 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
eb895086
KL		 8096 if (!nest)
8097 goto nla_put_failure;
3b49e2e9 8098 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
71a8a63b 8099 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
3b49e2e9
PNA		 8100 goto nla_put_failure;
8101
ae0be8de 8102 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
3b49e2e9
PNA		 8103 if (!nest_devs)
8104 goto nla_put_failure;
8105
c42d8bda 8106 list_for_each_entry_rcu(hook, hook_list, list) {
3f0465a9 8107 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
3b49e2e9
PNA		 8108 goto nla_put_failure;
8109 }
8110 nla_nest_end(skb, nest_devs);
8111 nla_nest_end(skb, nest);
8112
8113 nlmsg_end(skb, nlh);
8114 return 0;
8115
8116nla_put_failure:
8117 nlmsg_trim(skb, nlh);
8118 return -1;
8119}
8120
8121struct nft_flowtable_filter {
8122 char *table;
8123};
8124
8125static int nf_tables_dump_flowtable(struct sk_buff *skb,
8126 struct netlink_callback *cb)
8127{
8128 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8129 struct nft_flowtable_filter *filter = cb->data;
8130 unsigned int idx = 0, s_idx = cb->args[0];
8131 struct net *net = sock_net(skb->sk);
8132 int family = nfmsg->nfgen_family;
8133 struct nft_flowtable *flowtable;
0854db2a 8134 struct nftables_pernet *nft_net;
3b49e2e9
PNA		 8135 const struct nft_table *table;
8136
8137 rcu_read_lock();
d59d2f82 8138 nft_net = nft_pernet(net);
34002783 8139 cb->seq = READ_ONCE(nft_net->base_seq);
3b49e2e9 8140
0854db2a 8141 list_for_each_entry_rcu(table, &nft_net->tables, list) {
98319cb9 8142 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 8143 continue;
8144
36596dad
PNA		 8145 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8146 if (!nft_is_active(net, flowtable))
8147 goto cont;
8148 if (idx < s_idx)
8149 goto cont;
8150 if (idx > s_idx)
8151 memset(&cb->args[1], 0,
8152 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 8153 if (filter && filter->table &&
36596dad
PNA		 8154 strcmp(filter->table, table->name))
8155 goto cont;
3b49e2e9 8156
36596dad
PNA		 8157 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8158 cb->nlh->nlmsg_seq,
8159 NFT_MSG_NEWFLOWTABLE,
8160 NLM_F_MULTI | NLM_F_APPEND,
c42d8bda
PNA		 8161 table->family,
8162 flowtable,
8163 &flowtable->hook_list) < 0)
36596dad 8164 goto done;
3b49e2e9 8165
36596dad 8166 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 8167cont:
36596dad 8168 idx++;
3b49e2e9
PNA		 8169 }
8170 }
8171done:
8172 rcu_read_unlock();
8173
8174 cb->args[0] = idx;
8175 return skb->len;
8176}
8177
90fd131a 8178static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 8179{
90fd131a
FW		 8180 const struct nlattr * const *nla = cb->data;
8181 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 8182
90fd131a
FW		 8183 if (nla[NFTA_FLOWTABLE_TABLE]) {
8184 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8185 if (!filter)
8186 return -ENOMEM;
3b49e2e9 8187
90fd131a
FW		 8188 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8189 GFP_ATOMIC);
8190 if (!filter->table) {
8191 kfree(filter);
8192 return -ENOMEM;
8193 }
8194 }
3b49e2e9 8195
90fd131a 8196 cb->data = filter;
3b49e2e9
PNA		 8197 return 0;
8198}
8199
90fd131a 8200static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 8201{
90fd131a 8202 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 8203
3b49e2e9 8204 if (!filter)
90fd131a 8205 return 0;
3b49e2e9 8206
90fd131a
FW		 8207 kfree(filter->table);
8208 kfree(filter);
8209
8210 return 0;
3b49e2e9
PNA		 8211}
8212
d9adf22a 8213/* called with rcu_read_lock held */
797d4980
PNA		 8214static int nf_tables_getflowtable(struct sk_buff *skb,
8215 const struct nfnl_info *info,
8216 const struct nlattr * const nla[])
3b49e2e9 8217{
797d4980 8218 u8 genmask = nft_genmask_cur(info->net);
ef4b65e5 8219 u8 family = info->nfmsg->nfgen_family;
3b49e2e9 8220 struct nft_flowtable *flowtable;
3b49e2e9 8221 const struct nft_table *table;
797d4980 8222 struct net *net = info->net;
3b49e2e9
PNA		 8223 struct sk_buff *skb2;
8224 int err;
8225
797d4980 8226 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3b49e2e9 8227 struct netlink_dump_control c = {
90fd131a 8228 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 8229 .dump = nf_tables_dump_flowtable,
8230 .done = nf_tables_dump_flowtable_done,
d9adf22a 8231 .module = THIS_MODULE,
90fd131a 8232 .data = (void *)nla,
3b49e2e9
PNA		 8233 };
8234
797d4980 8235 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3b49e2e9
PNA		 8236 }
8237
8238 if (!nla[NFTA_FLOWTABLE_NAME])
8239 return -EINVAL;
8240
cac20fcd 8241 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 8242 genmask, 0);
3b49e2e9
PNA		 8243 if (IS_ERR(table))
8244 return PTR_ERR(table);
8245
cac20fcd
PNA		 8246 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8247 genmask);
03a0120f 8248 if (IS_ERR(flowtable))
3b49e2e9
PNA		 8249 return PTR_ERR(flowtable);
8250
d9adf22a 8251 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 8252 if (!skb2)
8253 return -ENOMEM;
8254
8255 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
797d4980 8256 info->nlh->nlmsg_seq,
3b49e2e9 8257 NFT_MSG_NEWFLOWTABLE, 0, family,
c42d8bda 8258 flowtable, &flowtable->hook_list);
3b49e2e9 8259 if (err < 0)
ee921183 8260 goto err_fill_flowtable_info;
3b49e2e9 8261
ee921183
PNA		 8262 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8263
8264err_fill_flowtable_info:
3b49e2e9
PNA		 8265 kfree_skb(skb2);
8266 return err;
8267}
8268
8269static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8270 struct nft_flowtable *flowtable,
c42d8bda 8271 struct list_head *hook_list,
3b49e2e9
PNA		 8272 int event)
8273{
d59d2f82 8274 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3b49e2e9 8275 struct sk_buff *skb;
6fb721cf 8276 u16 flags = 0;
3b49e2e9
PNA		 8277 int err;
8278
dceababa 8279 if (!ctx->report &&
3b49e2e9
PNA		 8280 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8281 return;
8282
8283 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8284 if (skb == NULL)
8285 goto err;
8286
6fb721cf
PNA		 8287 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8288 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8289
3b49e2e9 8290 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6fb721cf 8291 ctx->seq, event, flags,
c42d8bda 8292 ctx->family, flowtable, hook_list);
3b49e2e9
PNA		 8293 if (err < 0) {
8294 kfree_skb(skb);
8295 goto err;
8296 }
8297
0854db2a 8298 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3b49e2e9
PNA		 8299 return;
8300err:
8301 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8302}
8303
3b49e2e9
PNA		 8304static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8305{
3f0465a9
PNA		 8306 struct nft_hook *hook, *next;
8307
5acab914 8308 flowtable->data.type->free(&flowtable->data);
3f0465a9 8309 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
5acab914
PNA		 8310 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8311 FLOW_BLOCK_UNBIND);
3f0465a9
PNA		 8312 list_del_rcu(&hook->list);
8313 kfree(hook);
8314 }
3b49e2e9 8315 kfree(flowtable->name);
3b49e2e9 8316 module_put(flowtable->data.type->owner);
a12486eb 8317 kfree(flowtable);
3b49e2e9
PNA		 8318}
8319
84d7fce6
PNA		 8320static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8321 u32 portid, u32 seq)
8322{
d59d2f82 8323 struct nftables_pernet *nft_net = nft_pernet(net);
84d7fce6 8324 struct nlmsghdr *nlh;
784b4e61 8325 char buf[TASK_COMM_LEN];
dedb67c4 8326 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6 8327
19c28b13
PNA		 8328 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8329 NFNETLINK_V0, nft_base_seq(net));
8330 if (!nlh)
84d7fce6
PNA		 8331 goto nla_put_failure;
8332
0854db2a 8333 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
784b4e61
PS		 8334 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8335 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 8336 goto nla_put_failure;
8337
053c095a
JB		 8338 nlmsg_end(skb, nlh);
8339 return 0;
84d7fce6
PNA		 8340
8341nla_put_failure:
8342 nlmsg_trim(skb, nlh);
8343 return -EMSGSIZE;
8344}
8345
3b49e2e9
PNA		 8346static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8347 struct nft_flowtable *flowtable)
8348{
3f0465a9 8349 struct nft_hook *hook;
3b49e2e9 8350
3f0465a9
PNA		 8351 list_for_each_entry(hook, &flowtable->hook_list, list) {
8352 if (hook->ops.dev != dev)
3b49e2e9
PNA		 8353 continue;
8354
5acab914 8355 /* flow_offload_netdev_event() cleans up entries for us. */
ff4bf2f4 8356 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
3f0465a9
PNA		 8357 list_del_rcu(&hook->list);
8358 kfree_rcu(hook, rcu);
3b49e2e9
PNA		 8359 break;
8360 }
8361}
8362
8363static int nf_tables_flowtable_event(struct notifier_block *this,
8364 unsigned long event, void *ptr)
8365{
8366 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8367 struct nft_flowtable *flowtable;
0854db2a 8368 struct nftables_pernet *nft_net;
3b49e2e9 8369 struct nft_table *table;
0a2cf5ee 8370 struct net *net;
3b49e2e9
PNA		 8371
8372 if (event != NETDEV_UNREGISTER)
8373 return 0;
8374
6a48de01 8375 net = dev_net(dev);
d59d2f82 8376 nft_net = nft_pernet(net);
0854db2a
FW		 8377 mutex_lock(&nft_net->commit_mutex);
8378 list_for_each_entry(table, &nft_net->tables, list) {
36596dad
PNA		 8379 list_for_each_entry(flowtable, &table->flowtables, list) {
8380 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 8381 }
8382 }
0854db2a 8383 mutex_unlock(&nft_net->commit_mutex);
6a48de01 8384
3b49e2e9
PNA		 8385 return NOTIFY_DONE;
8386}
8387
8388static struct notifier_block nf_tables_flowtable_notifier = {
8389 .notifier_call = nf_tables_flowtable_event,
8390};
8391
25e94a99
PNA		 8392static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8393 int event)
84d7fce6
PNA		 8394{
8395 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8396 struct sk_buff *skb2;
8397 int err;
8398
dceababa 8399 if (!nlmsg_report(nlh) &&
84d7fce6 8400 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 8401 return;
84d7fce6 8402
84d7fce6
PNA		 8403 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8404 if (skb2 == NULL)
8405 goto err;
8406
8407 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8408 nlh->nlmsg_seq);
8409 if (err < 0) {
8410 kfree_skb(skb2);
8411 goto err;
8412 }
8413
25e94a99
PNA		 8414 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8415 nlmsg_report(nlh), GFP_KERNEL);
8416 return;
84d7fce6 8417err:
25e94a99
PNA		 8418 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8419 -ENOBUFS);
84d7fce6
PNA		 8420}
8421
797d4980
PNA		 8422static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8423 const struct nlattr * const nla[])
84d7fce6 8424{
84d7fce6
PNA		 8425 struct sk_buff *skb2;
8426 int err;
8427
d9adf22a 8428 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 8429 if (skb2 == NULL)
8430 return -ENOMEM;
8431
797d4980
PNA		 8432 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8433 info->nlh->nlmsg_seq);
84d7fce6 8434 if (err < 0)
ee921183 8435 goto err_fill_gen_info;
84d7fce6 8436
797d4980 8437 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
ee921183
PNA		 8438
8439err_fill_gen_info:
84d7fce6
PNA		 8440 kfree_skb(skb2);
8441 return err;
8442}
8443
96518518
PM		 8444static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8445 [NFT_MSG_NEWTABLE] = {
50f2db9e
PNA		 8446 .call = nf_tables_newtable,
8447 .type = NFNL_CB_BATCH,
96518518
PM		 8448 .attr_count = NFTA_TABLE_MAX,
8449 .policy = nft_table_policy,
8450 },
8451 [NFT_MSG_GETTABLE] = {
50f2db9e
PNA		 8452 .call = nf_tables_gettable,
8453 .type = NFNL_CB_RCU,
96518518
PM		 8454 .attr_count = NFTA_TABLE_MAX,
8455 .policy = nft_table_policy,
8456 },
8457 [NFT_MSG_DELTABLE] = {
50f2db9e
PNA		 8458 .call = nf_tables_deltable,
8459 .type = NFNL_CB_BATCH,
96518518
PM		 8460 .attr_count = NFTA_TABLE_MAX,
8461 .policy = nft_table_policy,
8462 },
f80a612d
FFM		 8463 [NFT_MSG_DESTROYTABLE] = {
8464 .call = nf_tables_deltable,
8465 .type = NFNL_CB_BATCH,
8466 .attr_count = NFTA_TABLE_MAX,
8467 .policy = nft_table_policy,
8468 },
96518518 8469 [NFT_MSG_NEWCHAIN] = {
50f2db9e
PNA		 8470 .call = nf_tables_newchain,
8471 .type = NFNL_CB_BATCH,
96518518
PM		 8472 .attr_count = NFTA_CHAIN_MAX,
8473 .policy = nft_chain_policy,
8474 },
8475 [NFT_MSG_GETCHAIN] = {
50f2db9e
PNA		 8476 .call = nf_tables_getchain,
8477 .type = NFNL_CB_RCU,
96518518
PM		 8478 .attr_count = NFTA_CHAIN_MAX,
8479 .policy = nft_chain_policy,
8480 },
8481 [NFT_MSG_DELCHAIN] = {
50f2db9e
PNA		 8482 .call = nf_tables_delchain,
8483 .type = NFNL_CB_BATCH,
96518518
PM		 8484 .attr_count = NFTA_CHAIN_MAX,
8485 .policy = nft_chain_policy,
8486 },
f80a612d
FFM		 8487 [NFT_MSG_DESTROYCHAIN] = {
8488 .call = nf_tables_delchain,
8489 .type = NFNL_CB_BATCH,
8490 .attr_count = NFTA_CHAIN_MAX,
8491 .policy = nft_chain_policy,
8492 },
96518518 8493 [NFT_MSG_NEWRULE] = {
50f2db9e
PNA		 8494 .call = nf_tables_newrule,
8495 .type = NFNL_CB_BATCH,
96518518
PM		 8496 .attr_count = NFTA_RULE_MAX,
8497 .policy = nft_rule_policy,
8498 },
8499 [NFT_MSG_GETRULE] = {
50f2db9e
PNA		 8500 .call = nf_tables_getrule,
8501 .type = NFNL_CB_RCU,
96518518
PM		 8502 .attr_count = NFTA_RULE_MAX,
8503 .policy = nft_rule_policy,
8504 },
8daa8fde
PS		 8505 [NFT_MSG_GETRULE_RESET] = {
8506 .call = nf_tables_getrule,
8507 .type = NFNL_CB_RCU,
8508 .attr_count = NFTA_RULE_MAX,
8509 .policy = nft_rule_policy,
8510 },
96518518 8511 [NFT_MSG_DELRULE] = {
50f2db9e
PNA		 8512 .call = nf_tables_delrule,
8513 .type = NFNL_CB_BATCH,
96518518
PM		 8514 .attr_count = NFTA_RULE_MAX,
8515 .policy = nft_rule_policy,
8516 },
f80a612d
FFM		 8517 [NFT_MSG_DESTROYRULE] = {
8518 .call = nf_tables_delrule,
8519 .type = NFNL_CB_BATCH,
8520 .attr_count = NFTA_RULE_MAX,
8521 .policy = nft_rule_policy,
8522 },
20a69341 8523 [NFT_MSG_NEWSET] = {
50f2db9e
PNA		 8524 .call = nf_tables_newset,
8525 .type = NFNL_CB_BATCH,
20a69341
PM		 8526 .attr_count = NFTA_SET_MAX,
8527 .policy = nft_set_policy,
8528 },
8529 [NFT_MSG_GETSET] = {
50f2db9e
PNA		 8530 .call = nf_tables_getset,
8531 .type = NFNL_CB_RCU,
20a69341
PM		 8532 .attr_count = NFTA_SET_MAX,
8533 .policy = nft_set_policy,
8534 },
8535 [NFT_MSG_DELSET] = {
50f2db9e
PNA		 8536 .call = nf_tables_delset,
8537 .type = NFNL_CB_BATCH,
20a69341
PM		 8538 .attr_count = NFTA_SET_MAX,
8539 .policy = nft_set_policy,
8540 },
f80a612d
FFM		 8541 [NFT_MSG_DESTROYSET] = {
8542 .call = nf_tables_delset,
8543 .type = NFNL_CB_BATCH,
8544 .attr_count = NFTA_SET_MAX,
8545 .policy = nft_set_policy,
8546 },
20a69341 8547 [NFT_MSG_NEWSETELEM] = {
50f2db9e
PNA		 8548 .call = nf_tables_newsetelem,
8549 .type = NFNL_CB_BATCH,
20a69341
PM		 8550 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8551 .policy = nft_set_elem_list_policy,
8552 },
8553 [NFT_MSG_GETSETELEM] = {
50f2db9e
PNA		 8554 .call = nf_tables_getsetelem,
8555 .type = NFNL_CB_RCU,
20a69341
PM		 8556 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8557 .policy = nft_set_elem_list_policy,
8558 },
8559 [NFT_MSG_DELSETELEM] = {
50f2db9e
PNA		 8560 .call = nf_tables_delsetelem,
8561 .type = NFNL_CB_BATCH,
20a69341
PM		 8562 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8563 .policy = nft_set_elem_list_policy,
8564 },
f80a612d
FFM		 8565 [NFT_MSG_DESTROYSETELEM] = {
8566 .call = nf_tables_delsetelem,
8567 .type = NFNL_CB_BATCH,
8568 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8569 .policy = nft_set_elem_list_policy,
8570 },
84d7fce6 8571 [NFT_MSG_GETGEN] = {
50f2db9e
PNA		 8572 .call = nf_tables_getgen,
8573 .type = NFNL_CB_RCU,
84d7fce6 8574 },
e5009240 8575 [NFT_MSG_NEWOBJ] = {
50f2db9e
PNA		 8576 .call = nf_tables_newobj,
8577 .type = NFNL_CB_BATCH,
e5009240
PNA		 8578 .attr_count = NFTA_OBJ_MAX,
8579 .policy = nft_obj_policy,
8580 },
8581 [NFT_MSG_GETOBJ] = {
50f2db9e
PNA		 8582 .call = nf_tables_getobj,
8583 .type = NFNL_CB_RCU,
e5009240
PNA		 8584 .attr_count = NFTA_OBJ_MAX,
8585 .policy = nft_obj_policy,
8586 },
8587 [NFT_MSG_DELOBJ] = {
50f2db9e
PNA		 8588 .call = nf_tables_delobj,
8589 .type = NFNL_CB_BATCH,
e5009240
PNA		 8590 .attr_count = NFTA_OBJ_MAX,
8591 .policy = nft_obj_policy,
8592 },
f80a612d
FFM		 8593 [NFT_MSG_DESTROYOBJ] = {
8594 .call = nf_tables_delobj,
8595 .type = NFNL_CB_BATCH,
8596 .attr_count = NFTA_OBJ_MAX,
8597 .policy = nft_obj_policy,
8598 },
43da04a5 8599 [NFT_MSG_GETOBJ_RESET] = {
50f2db9e
PNA		 8600 .call = nf_tables_getobj,
8601 .type = NFNL_CB_RCU,
43da04a5
PNA		 8602 .attr_count = NFTA_OBJ_MAX,
8603 .policy = nft_obj_policy,
8604 },
3b49e2e9 8605 [NFT_MSG_NEWFLOWTABLE] = {
50f2db9e
PNA		 8606 .call = nf_tables_newflowtable,
8607 .type = NFNL_CB_BATCH,
3b49e2e9
PNA		 8608 .attr_count = NFTA_FLOWTABLE_MAX,
8609 .policy = nft_flowtable_policy,
8610 },
8611 [NFT_MSG_GETFLOWTABLE] = {
50f2db9e
PNA		 8612 .call = nf_tables_getflowtable,
8613 .type = NFNL_CB_RCU,
3b49e2e9
PNA		 8614 .attr_count = NFTA_FLOWTABLE_MAX,
8615 .policy = nft_flowtable_policy,
8616 },
8617 [NFT_MSG_DELFLOWTABLE] = {
50f2db9e
PNA		 8618 .call = nf_tables_delflowtable,
8619 .type = NFNL_CB_BATCH,
3b49e2e9
PNA		 8620 .attr_count = NFTA_FLOWTABLE_MAX,
8621 .policy = nft_flowtable_policy,
8622 },
f80a612d
FFM		 8623 [NFT_MSG_DESTROYFLOWTABLE] = {
8624 .call = nf_tables_delflowtable,
8625 .type = NFNL_CB_BATCH,
8626 .attr_count = NFTA_FLOWTABLE_MAX,
8627 .policy = nft_flowtable_policy,
8628 },
96518518
PM		 8629};
8630
a654de8f
PNA		 8631static int nf_tables_validate(struct net *net)
8632{
d59d2f82 8633 struct nftables_pernet *nft_net = nft_pernet(net);
a654de8f
PNA		 8634 struct nft_table *table;
8635
0854db2a 8636 switch (nft_net->validate_state) {
a654de8f
PNA		 8637 case NFT_VALIDATE_SKIP:
8638 break;
8639 case NFT_VALIDATE_NEED:
8640 nft_validate_state_update(net, NFT_VALIDATE_DO);
954d8297 8641 fallthrough;
a654de8f 8642 case NFT_VALIDATE_DO:
0854db2a 8643 list_for_each_entry(table, &nft_net->tables, list) {
a654de8f
PNA		 8644 if (nft_table_validate(net, table) < 0)
8645 return -EAGAIN;
8646 }
8647 break;
8648 }
8649
8650 return 0;
8651}
8652
66293c46
FW		 8653/* a drop policy has to be deferred until all rules have been activated,
8654 * otherwise a large ruleset that contains a drop-policy base chain will
8655 * cause all packets to get dropped until the full transaction has been
8656 * processed.
8657 *
8658 * We defer the drop policy until the transaction has been finalized.
8659 */
8660static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8661{
8662 struct nft_base_chain *basechain;
8663
8664 if (nft_trans_chain_policy(trans) != NF_DROP)
8665 return;
8666
8667 if (!nft_is_base_chain(trans->ctx.chain))
8668 return;
8669
8670 basechain = nft_base_chain(trans->ctx.chain);
8671 basechain->policy = NF_DROP;
8672}
8673
91c7b38d
PNA		 8674static void nft_chain_commit_update(struct nft_trans *trans)
8675{
8676 struct nft_base_chain *basechain;
8677
1b2470e5
FW		 8678 if (nft_trans_chain_name(trans)) {
8679 rhltable_remove(&trans->ctx.table->chains_ht,
8680 &trans->ctx.chain->rhlhead,
8681 nft_chain_ht_params);
d71efb59 8682 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 8683 rhltable_insert_key(&trans->ctx.table->chains_ht,
8684 trans->ctx.chain->name,
8685 &trans->ctx.chain->rhlhead,
8686 nft_chain_ht_params);
8687 }
91c7b38d 8688
f323d954 8689 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 8690 return;
8691
53315ac6
FW		 8692 nft_chain_stats_replace(trans);
8693
91c7b38d 8694 basechain = nft_base_chain(trans->ctx.chain);
91c7b38d
PNA		 8695
8696 switch (nft_trans_chain_policy(trans)) {
8697 case NF_DROP:
8698 case NF_ACCEPT:
8699 basechain->policy = nft_trans_chain_policy(trans);
8700 break;
8701 }
8702}
8703
d62d0ba9
FFM		 8704static void nft_obj_commit_update(struct nft_trans *trans)
8705{
8706 struct nft_object *newobj;
8707 struct nft_object *obj;
8708
8709 obj = nft_trans_obj(trans);
8710 newobj = nft_trans_obj_newobj(trans);
8711
9fedd894
FFM		 8712 if (obj->ops->update)
8713 obj->ops->update(obj, newobj);
d62d0ba9 8714
dad3bdee 8715 nft_obj_destroy(&trans->ctx, newobj);
d62d0ba9
FFM		 8716}
8717
2f99aa31 8718static void nft_commit_release(struct nft_trans *trans)
c7c32e72 8719{
c7c32e72
PNA		 8720 switch (trans->msg_type) {
8721 case NFT_MSG_DELTABLE:
f80a612d 8722 case NFT_MSG_DESTROYTABLE:
c7c32e72
PNA		 8723 nf_tables_table_destroy(&trans->ctx);
8724 break;
9f8aac0b 8725 case NFT_MSG_NEWCHAIN:
53315ac6 8726 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b
FW		 8727 kfree(nft_trans_chain_name(trans));
8728 break;
c7c32e72 8729 case NFT_MSG_DELCHAIN:
f80a612d 8730 case NFT_MSG_DESTROYCHAIN:
43a605f2 8731 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 8732 break;
8733 case NFT_MSG_DELRULE:
f80a612d 8734 case NFT_MSG_DESTROYRULE:
c7c32e72
PNA		 8735 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8736 break;
8737 case NFT_MSG_DELSET:
f80a612d 8738 case NFT_MSG_DESTROYSET:
0c2a85ed 8739 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 8740 break;
61edafbb 8741 case NFT_MSG_DELSETELEM:
f80a612d 8742 case NFT_MSG_DESTROYSETELEM:
3453c927
PNA		 8743 nf_tables_set_elem_destroy(&trans->ctx,
8744 nft_trans_elem_set(trans),
59105446 8745 nft_trans_elem(trans).priv);
61edafbb 8746 break;
e5009240 8747 case NFT_MSG_DELOBJ:
f80a612d 8748 case NFT_MSG_DESTROYOBJ:
00bfb320 8749 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 8750 break;
3b49e2e9 8751 case NFT_MSG_DELFLOWTABLE:
f80a612d 8752 case NFT_MSG_DESTROYFLOWTABLE:
abadb2f8
PNA		 8753 if (nft_trans_flowtable_update(trans))
8754 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8755 else
8756 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 8757 break;
c7c32e72 8758 }
0935d558
FW		 8759
8760 if (trans->put_net)
8761 put_net(trans->ctx.net);
8762
c7c32e72
PNA		 8763 kfree(trans);
8764}
8765
0935d558 8766static void nf_tables_trans_destroy_work(struct work_struct *w)
2f99aa31
FW		 8767{
8768 struct nft_trans *trans, *next;
0935d558
FW		 8769 LIST_HEAD(head);
8770
8771 spin_lock(&nf_tables_destroy_list_lock);
8772 list_splice_init(&nf_tables_destroy_list, &head);
8773 spin_unlock(&nf_tables_destroy_list_lock);
2f99aa31 8774
0935d558 8775 if (list_empty(&head))
2f99aa31
FW		 8776 return;
8777
8778 synchronize_rcu();
8779
0935d558 8780 list_for_each_entry_safe(trans, next, &head, list) {
2f99aa31
FW		 8781 list_del(&trans->list);
8782 nft_commit_release(trans);
8783 }
8784}
8785
ffe8923f
FW		 8786void nf_tables_trans_destroy_flush_work(void)
8787{
8788 flush_work(&trans_destroy_work);
8789}
8790EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8791
ed5f85d4
PNA		 8792static bool nft_expr_reduce(struct nft_regs_track *track,
8793 const struct nft_expr *expr)
8794{
9e539c5b 8795 return false;
ed5f85d4
PNA		 8796}
8797
0cbc06b3
FW		 8798static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8799{
2c865a8a 8800 const struct nft_expr *expr, *last;
12e4ecfa 8801 struct nft_regs_track track = {};
2c865a8a
PNA		 8802 unsigned int size, data_size;
8803 void *data, *data_boundary;
8804 struct nft_rule_dp *prule;
0cbc06b3 8805 struct nft_rule *rule;
0cbc06b3
FW		 8806
8807 /* already handled or inactive chain? */
2c865a8a 8808 if (chain->blob_next || !nft_is_active_next(net, chain))
0cbc06b3
FW		 8809 return 0;
8810
63045bfd 8811 data_size = 0;
10377d42 8812 list_for_each_entry(rule, &chain->rules, list) {
2c865a8a
PNA		 8813 if (nft_is_active_next(net, rule)) {
8814 data_size += sizeof(*prule) + rule->dlen;
8815 if (data_size > INT_MAX)
8816 return -ENOMEM;
8817 }
0cbc06b3 8818 }
2c865a8a 8819 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
0cbc06b3 8820
2c865a8a
PNA		 8821 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8822 if (!chain->blob_next)
0cbc06b3
FW		 8823 return -ENOMEM;
8824
2c865a8a
PNA		 8825 data = (void *)chain->blob_next->data;
8826 data_boundary = data + data_size;
8827 size = 0;
8828
10377d42 8829 list_for_each_entry(rule, &chain->rules, list) {
2c865a8a
PNA		 8830 if (!nft_is_active_next(net, rule))
8831 continue;
8832
8833 prule = (struct nft_rule_dp *)data;
8834 data += offsetof(struct nft_rule_dp, data);
8835 if (WARN_ON_ONCE(data > data_boundary))
8836 return -ENOMEM;
8837
12e4ecfa 8838 size = 0;
fe75e84a 8839 track.last = nft_expr_last(rule);
2c865a8a 8840 nft_rule_for_each_expr(expr, last, rule) {
12e4ecfa
PNA		 8841 track.cur = expr;
8842
ed5f85d4 8843 if (nft_expr_reduce(&track, expr)) {
12e4ecfa
PNA		 8844 expr = track.cur;
8845 continue;
8846 }
8847
2c865a8a
PNA		 8848 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8849 return -ENOMEM;
8850
8851 memcpy(data + size, expr, expr->ops->size);
8852 size += expr->ops->size;
8853 }
8854 if (WARN_ON_ONCE(size >= 1 << 12))
8855 return -ENOMEM;
8856
8857 prule->handle = rule->handle;
8858 prule->dlen = size;
8859 prule->is_last = 0;
8860
8861 data += size;
8862 size = 0;
8863 chain->blob_next->size += (unsigned long)(data - (void *)prule);
0cbc06b3
FW		 8864 }
8865
2c865a8a
PNA		 8866 prule = (struct nft_rule_dp *)data;
8867 data += offsetof(struct nft_rule_dp, data);
8868 if (WARN_ON_ONCE(data > data_boundary))
8869 return -ENOMEM;
8870
8871 nft_last_rule(chain->blob_next, prule);
8872
0cbc06b3
FW		 8873 return 0;
8874}
8875
8876static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8877{
d59d2f82 8878 struct nftables_pernet *nft_net = nft_pernet(net);
0cbc06b3
FW		 8879 struct nft_trans *trans, *next;
8880
0854db2a 8881 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
0cbc06b3
FW		 8882 struct nft_chain *chain = trans->ctx.chain;
8883
8884 if (trans->msg_type == NFT_MSG_NEWRULE ||
8885 trans->msg_type == NFT_MSG_DELRULE) {
2c865a8a
PNA		 8886 kvfree(chain->blob_next);
8887 chain->blob_next = NULL;
0cbc06b3
FW		 8888 }
8889 }
8890}
8891
8892static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8893{
8894 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8895
2c865a8a 8896 kvfree(o->blob);
0cbc06b3
FW		 8897}
8898
2c865a8a 8899static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
0cbc06b3 8900{
0cbc06b3
FW		 8901 struct nft_rules_old *old;
8902
2c865a8a
PNA		 8903 /* rcu_head is after end marker */
8904 old = (void *)blob + sizeof(*blob) + blob->size;
8905 old->blob = blob;
0cbc06b3
FW		 8906
8907 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8908}
8909
0fb39bbe 8910static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
0cbc06b3 8911{
2c865a8a 8912 struct nft_rule_blob *g0, *g1;
0cbc06b3
FW		 8913 bool next_genbit;
8914
8915 next_genbit = nft_gencursor_next(net);
8916
2c865a8a 8917 g0 = rcu_dereference_protected(chain->blob_gen_0,
f102d66b 8918 lockdep_commit_lock_is_held(net));
2c865a8a 8919 g1 = rcu_dereference_protected(chain->blob_gen_1,
f102d66b 8920 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 8921
8922 /* No changes to this chain? */
2c865a8a 8923 if (chain->blob_next == NULL) {
0cbc06b3
FW		 8924 /* chain had no change in last or next generation */
8925 if (g0 == g1)
8926 return;
8927 /*
8928 * chain had no change in this generation; make sure next
8929 * one uses same rules as current generation.
8930 */
8931 if (next_genbit) {
2c865a8a 8932 rcu_assign_pointer(chain->blob_gen_1, g0);
0cbc06b3
FW		 8933 nf_tables_commit_chain_free_rules_old(g1);
8934 } else {
2c865a8a 8935 rcu_assign_pointer(chain->blob_gen_0, g1);
0cbc06b3
FW		 8936 nf_tables_commit_chain_free_rules_old(g0);
8937 }
8938
8939 return;
8940 }
8941
8942 if (next_genbit)
2c865a8a 8943 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
0cbc06b3 8944 else
2c865a8a 8945 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
0cbc06b3 8946
2c865a8a 8947 chain->blob_next = NULL;
0cbc06b3
FW		 8948
8949 if (g0 == g1)
8950 return;
8951
8952 if (next_genbit)
8953 nf_tables_commit_chain_free_rules_old(g1);
8954 else
8955 nf_tables_commit_chain_free_rules_old(g0);
8956}
8957
d152159b
FW		 8958static void nft_obj_del(struct nft_object *obj)
8959{
4d44175a 8960 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
d152159b
FW		 8961 list_del_rcu(&obj->list);
8962}
8963
d0e2c7de 8964void nft_chain_del(struct nft_chain *chain)
1b2470e5
FW		 8965{
8966 struct nft_table *table = chain->table;
8967
8968 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8969 nft_chain_ht_params));
8970 list_del_rcu(&chain->list);
8971}
8972
eb014de4
PNA		 8973static void nf_tables_module_autoload_cleanup(struct net *net)
8974{
d59d2f82 8975 struct nftables_pernet *nft_net = nft_pernet(net);
eb014de4
PNA		 8976 struct nft_module_request *req, *next;
8977
0854db2a
FW		 8978 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8979 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
eb014de4
PNA		 8980 WARN_ON_ONCE(!req->done);
8981 list_del(&req->list);
8982 kfree(req);
8983 }
8984}
8985
0935d558
FW		 8986static void nf_tables_commit_release(struct net *net)
8987{
d59d2f82 8988 struct nftables_pernet *nft_net = nft_pernet(net);
0935d558
FW		 8989 struct nft_trans *trans;
8990
8991 /* all side effects have to be made visible.
8992 * For example, if a chain named 'foo' has been deleted, a
8993 * new transaction must not find it anymore.
8994 *
8995 * Memory reclaim happens asynchronously from work queue
8996 * to prevent expensive synchronize_rcu() in commit phase.
8997 */
0854db2a 8998 if (list_empty(&nft_net->commit_list)) {
eb014de4 8999 nf_tables_module_autoload_cleanup(net);
0854db2a 9000 mutex_unlock(&nft_net->commit_mutex);
0935d558
FW		 9001 return;
9002 }
9003
0854db2a 9004 trans = list_last_entry(&nft_net->commit_list,
0935d558
FW		 9005 struct nft_trans, list);
9006 get_net(trans->ctx.net);
9007 WARN_ON_ONCE(trans->put_net);
9008
9009 trans->put_net = true;
9010 spin_lock(&nf_tables_destroy_list_lock);
0854db2a 9011 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
0935d558
FW		 9012 spin_unlock(&nf_tables_destroy_list_lock);
9013
eb014de4 9014 nf_tables_module_autoload_cleanup(net);
0935d558 9015 schedule_work(&trans_destroy_work);
ffe8923f 9016
0854db2a 9017 mutex_unlock(&nft_net->commit_mutex);
0935d558
FW		 9018}
9019
67cc570e
PNA		 9020static void nft_commit_notify(struct net *net, u32 portid)
9021{
d59d2f82 9022 struct nftables_pernet *nft_net = nft_pernet(net);
67cc570e
PNA		 9023 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9024 unsigned char *data;
9025 int len;
9026
0854db2a 9027 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
67cc570e
PNA		 9028 if (!batch_skb) {
9029new_batch:
9030 batch_skb = skb;
9031 len = NLMSG_GOODSIZE - skb->len;
9032 list_del(&skb->list);
9033 continue;
9034 }
9035 len -= skb->len;
9036 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9037 data = skb_put(batch_skb, skb->len);
9038 memcpy(data, skb->data, skb->len);
9039 list_del(&skb->list);
9040 kfree_skb(skb);
9041 continue;
9042 }
9043 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9044 NFT_CB(batch_skb).report, GFP_KERNEL);
9045 goto new_batch;
9046 }
9047
9048 if (batch_skb) {
9049 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9050 NFT_CB(batch_skb).report, GFP_KERNEL);
9051 }
9052
0854db2a 9053 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
67cc570e
PNA		 9054}
9055
c520292f
RGB		 9056static int nf_tables_commit_audit_alloc(struct list_head *adl,
9057 struct nft_table *table)
9058{
9059 struct nft_audit_data *adp;
9060
9061 list_for_each_entry(adp, adl, list) {
9062 if (adp->table == table)
9063 return 0;
9064 }
9065 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9066 if (!adp)
9067 return -ENOMEM;
9068 adp->table = table;
9069 list_add(&adp->list, adl);
9070 return 0;
9071}
9072
cfbe3650
DM		 9073static void nf_tables_commit_audit_free(struct list_head *adl)
9074{
9075 struct nft_audit_data *adp, *adn;
9076
9077 list_for_each_entry_safe(adp, adn, adl, list) {
9078 list_del(&adp->list);
9079 kfree(adp);
9080 }
9081}
9082
c520292f
RGB		 9083static void nf_tables_commit_audit_collect(struct list_head *adl,
9084 struct nft_table *table, u32 op)
9085{
9086 struct nft_audit_data *adp;
9087
9088 list_for_each_entry(adp, adl, list) {
9089 if (adp->table == table)
9090 goto found;
9091 }
dadf33c9 9092 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
c520292f
RGB		 9093 return;
9094found:
9095 adp->entries++;
9096 if (!adp->op || adp->op > op)
9097 adp->op = op;
9098}
9099
9100#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9101
9102static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9103{
9104 struct nft_audit_data *adp, *adn;
9105 char aubuf[AUNFTABLENAMELEN];
9106
9107 list_for_each_entry_safe(adp, adn, adl, list) {
9108 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9109 generation);
9110 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9111 nft2audit_op[adp->op], GFP_KERNEL);
9112 list_del(&adp->list);
9113 kfree(adp);
9114 }
9115}
9116
5913beaf 9117static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 9118{
d59d2f82 9119 struct nftables_pernet *nft_net = nft_pernet(net);
37082f93 9120 struct nft_trans *trans, *next;
a3716e70 9121 struct nft_trans_elem *te;
0cbc06b3
FW		 9122 struct nft_chain *chain;
9123 struct nft_table *table;
34002783 9124 unsigned int base_seq;
c520292f 9125 LIST_HEAD(adl);
c9626a2c 9126 int err;
37082f93 9127
0854db2a
FW		 9128 if (list_empty(&nft_net->commit_list)) {
9129 mutex_unlock(&nft_net->commit_mutex);
b8b27498
FW		 9130 return 0;
9131 }
9132
a654de8f
PNA		 9133 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9134 if (nf_tables_validate(net) < 0)
9135 return -EAGAIN;
9136
c9626a2c
PNA		 9137 err = nft_flow_rule_offload_commit(net);
9138 if (err < 0)
9139 return err;
9140
0cbc06b3 9141 /* 1. Allocate space for next generation rules_gen_X[] */
0854db2a 9142 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
0cbc06b3 9143 int ret;
37082f93 9144
c520292f
RGB		 9145 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9146 if (ret) {
9147 nf_tables_commit_chain_prepare_cancel(net);
cfbe3650 9148 nf_tables_commit_audit_free(&adl);
c520292f
RGB		 9149 return ret;
9150 }
0cbc06b3
FW		 9151 if (trans->msg_type == NFT_MSG_NEWRULE ||
9152 trans->msg_type == NFT_MSG_DELRULE) {
9153 chain = trans->ctx.chain;
9154
9155 ret = nf_tables_commit_chain_prepare(net, chain);
9156 if (ret < 0) {
9157 nf_tables_commit_chain_prepare_cancel(net);
cfbe3650 9158 nf_tables_commit_audit_free(&adl);
0cbc06b3
FW		 9159 return ret;
9160 }
9161 }
9162 }
37082f93 9163
0cbc06b3 9164 /* step 2. Make rules_gen_X visible to packet path */
0854db2a 9165 list_for_each_entry(table, &nft_net->tables, list) {
0fb39bbe
FW		 9166 list_for_each_entry(chain, &table->chains, list)
9167 nf_tables_commit_chain(net, chain);
0cbc06b3
FW		 9168 }
9169
9170 /*
9171 * Bump generation counter, invalidate any dump in progress.
9172 * Cannot fail after this point.
37082f93 9173 */
34002783
PNA		 9174 base_seq = READ_ONCE(nft_net->base_seq);
9175 while (++base_seq == 0)
0854db2a 9176 ;
0cbc06b3 9177
34002783
PNA		 9178 WRITE_ONCE(nft_net->base_seq, base_seq);
9179
0cbc06b3
FW		 9180 /* step 3. Start new generation, rules_gen_X now in use. */
9181 net->nft.gencursor = nft_gencursor_next(net);
37082f93 9182
0854db2a 9183 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
c520292f
RGB		 9184 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9185 trans->msg_type);
b380e5c7 9186 switch (trans->msg_type) {
55dd6f93
PNA		 9187 case NFT_MSG_NEWTABLE:
9188 if (nft_trans_table_update(trans)) {
179d9ba5
PNA		 9189 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9190 nft_trans_destroy(trans);
9191 break;
9192 }
9193 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
0ce7cf41
PNA		 9194 nf_tables_table_disable(net, trans->ctx.table);
9195
179d9ba5 9196 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
55dd6f93 9197 } else {
f2a6d766 9198 nft_clear(net, trans->ctx.table);
55dd6f93 9199 }
35151d84 9200 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 9201 nft_trans_destroy(trans);
9202 break;
9203 case NFT_MSG_DELTABLE:
f80a612d 9204 case NFT_MSG_DESTROYTABLE:
f2a6d766 9205 list_del_rcu(&trans->ctx.table->list);
f80a612d 9206 nf_tables_table_notify(&trans->ctx, trans->msg_type);
55dd6f93 9207 break;
91c7b38d 9208 case NFT_MSG_NEWCHAIN:
9f8aac0b 9209 if (nft_trans_chain_update(trans)) {
91c7b38d 9210 nft_chain_commit_update(trans);
9f8aac0b
FW		 9211 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9212 /* trans destroyed after rcu grace period */
9213 } else {
66293c46 9214 nft_chain_commit_drop_policy(trans);
664b0f8c 9215 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 9216 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9217 nft_trans_destroy(trans);
9218 }
91c7b38d
PNA		 9219 break;
9220 case NFT_MSG_DELCHAIN:
f80a612d 9221 case NFT_MSG_DESTROYCHAIN:
1b2470e5 9222 nft_chain_del(trans->ctx.chain);
f80a612d 9223 nf_tables_chain_notify(&trans->ctx, trans->msg_type);
c974a3a3
PNA		 9224 nf_tables_unregister_hook(trans->ctx.net,
9225 trans->ctx.table,
9226 trans->ctx.chain);
91c7b38d 9227 break;
b380e5c7 9228 case NFT_MSG_NEWRULE:
889f7ee7 9229 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 9230 nf_tables_rule_notify(&trans->ctx,
37082f93 9231 nft_trans_rule(trans),
35151d84 9232 NFT_MSG_NEWRULE);
9dd732e0
PNA		 9233 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9234 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9235
37082f93 9236 nft_trans_destroy(trans);
b380e5c7
PNA		 9237 break;
9238 case NFT_MSG_DELRULE:
f80a612d 9239 case NFT_MSG_DESTROYRULE:
b380e5c7 9240 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 9241 nf_tables_rule_notify(&trans->ctx,
9242 nft_trans_rule(trans),
f80a612d 9243 trans->msg_type);
f6ac8585
PNA		 9244 nft_rule_expr_deactivate(&trans->ctx,
9245 nft_trans_rule(trans),
9246 NFT_TRANS_COMMIT);
26b5934f
PNA		 9247
9248 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9249 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
b380e5c7 9250 break;
958bee14 9251 case NFT_MSG_NEWSET:
123b9961
PNA		 9252 if (nft_trans_set_update(trans)) {
9253 struct nft_set *set = nft_trans_set(trans);
4fefee57 9254
123b9961
PNA		 9255 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9256 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9257 } else {
9258 nft_clear(net, nft_trans_set(trans));
9259 /* This avoids hitting -EBUSY when deleting the table
9260 * from the transaction.
9261 */
9262 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9263 !list_empty(&nft_trans_set(trans)->bindings))
9264 trans->ctx.table->use--;
9265 }
958bee14 9266 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 9267 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 9268 nft_trans_destroy(trans);
9269 break;
9270 case NFT_MSG_DELSET:
f80a612d 9271 case NFT_MSG_DESTROYSET:
37a9cc52 9272 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 9273 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
f80a612d 9274 trans->msg_type, GFP_KERNEL);
958bee14 9275 break;
60319eb1 9276 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 9277 te = (struct nft_trans_elem *)trans->data;
9278
aaa31047 9279 nft_setelem_activate(net, te->set, &te->elem);
cc02e457
PM		 9280 nf_tables_setelem_notify(&trans->ctx, te->set,
9281 &te->elem,
6fb721cf 9282 NFT_MSG_NEWSETELEM);
60319eb1
PNA		 9283 nft_trans_destroy(trans);
9284 break;
9285 case NFT_MSG_DELSETELEM:
f80a612d 9286 case NFT_MSG_DESTROYSETELEM:
a3716e70 9287 te = (struct nft_trans_elem *)trans->data;
fe2811eb 9288
a3716e70
PNA		 9289 nf_tables_setelem_notify(&trans->ctx, te->set,
9290 &te->elem,
f80a612d 9291 trans->msg_type);
aaa31047
PNA		 9292 nft_setelem_remove(net, te->set, &te->elem);
9293 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9294 atomic_dec(&te->set->nelems);
9295 te->set->ndeact--;
9296 }
60319eb1 9297 break;
e5009240 9298 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 9299 if (nft_trans_obj_update(trans)) {
9300 nft_obj_commit_update(trans);
9301 nf_tables_obj_notify(&trans->ctx,
9302 nft_trans_obj(trans),
9303 NFT_MSG_NEWOBJ);
9304 } else {
9305 nft_clear(net, nft_trans_obj(trans));
9306 nf_tables_obj_notify(&trans->ctx,
9307 nft_trans_obj(trans),
9308 NFT_MSG_NEWOBJ);
9309 nft_trans_destroy(trans);
9310 }
e5009240
PNA		 9311 break;
9312 case NFT_MSG_DELOBJ:
f80a612d 9313 case NFT_MSG_DESTROYOBJ:
d152159b 9314 nft_obj_del(nft_trans_obj(trans));
e5009240 9315 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
f80a612d 9316 trans->msg_type);
e5009240 9317 break;
3b49e2e9 9318 case NFT_MSG_NEWFLOWTABLE:
78d9f48f 9319 if (nft_trans_flowtable_update(trans)) {
7b35582c
PNA		 9320 nft_trans_flowtable(trans)->data.flags =
9321 nft_trans_flowtable_flags(trans);
78d9f48f
PNA		 9322 nf_tables_flowtable_notify(&trans->ctx,
9323 nft_trans_flowtable(trans),
9324 &nft_trans_flowtable_hooks(trans),
9325 NFT_MSG_NEWFLOWTABLE);
9326 list_splice(&nft_trans_flowtable_hooks(trans),
9327 &nft_trans_flowtable(trans)->hook_list);
9328 } else {
9329 nft_clear(net, nft_trans_flowtable(trans));
9330 nf_tables_flowtable_notify(&trans->ctx,
9331 nft_trans_flowtable(trans),
9332 &nft_trans_flowtable(trans)->hook_list,
9333 NFT_MSG_NEWFLOWTABLE);
9334 }
3b49e2e9
PNA		 9335 nft_trans_destroy(trans);
9336 break;
9337 case NFT_MSG_DELFLOWTABLE:
f80a612d 9338 case NFT_MSG_DESTROYFLOWTABLE:
abadb2f8 9339 if (nft_trans_flowtable_update(trans)) {
abadb2f8
PNA		 9340 nf_tables_flowtable_notify(&trans->ctx,
9341 nft_trans_flowtable(trans),
9342 &nft_trans_flowtable_hooks(trans),
f80a612d 9343 trans->msg_type);
abadb2f8
PNA		 9344 nft_unregister_flowtable_net_hooks(net,
9345 &nft_trans_flowtable_hooks(trans));
9346 } else {
9347 list_del_rcu(&nft_trans_flowtable(trans)->list);
9348 nf_tables_flowtable_notify(&trans->ctx,
9349 nft_trans_flowtable(trans),
9350 &nft_trans_flowtable(trans)->hook_list,
f80a612d 9351 trans->msg_type);
abadb2f8
PNA		 9352 nft_unregister_flowtable_net_hooks(net,
9353 &nft_trans_flowtable(trans)->hook_list);
9354 }
3b49e2e9 9355 break;
37082f93 9356 }
37082f93
PNA		 9357 }
9358
67cc570e 9359 nft_commit_notify(net, NETLINK_CB(skb).portid);
84d7fce6 9360 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
0854db2a 9361 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
0935d558 9362 nf_tables_commit_release(net);
37082f93
PNA		 9363
9364 return 0;
9365}
9366
eb014de4
PNA		 9367static void nf_tables_module_autoload(struct net *net)
9368{
d59d2f82 9369 struct nftables_pernet *nft_net = nft_pernet(net);
eb014de4
PNA		 9370 struct nft_module_request *req, *next;
9371 LIST_HEAD(module_list);
9372
0854db2a
FW		 9373 list_splice_init(&nft_net->module_list, &module_list);
9374 mutex_unlock(&nft_net->commit_mutex);
eb014de4 9375 list_for_each_entry_safe(req, next, &module_list, list) {
1d305ba4
FW		 9376 request_module("%s", req->module);
9377 req->done = true;
eb014de4 9378 }
0854db2a
FW		 9379 mutex_lock(&nft_net->commit_mutex);
9380 list_splice(&module_list, &nft_net->module_list);
eb014de4
PNA		 9381}
9382
b326dd37 9383static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 9384{
c7c32e72
PNA		 9385 switch (trans->msg_type) {
9386 case NFT_MSG_NEWTABLE:
9387 nf_tables_table_destroy(&trans->ctx);
9388 break;
9389 case NFT_MSG_NEWCHAIN:
43a605f2 9390 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 9391 break;
9392 case NFT_MSG_NEWRULE:
9393 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9394 break;
9395 case NFT_MSG_NEWSET:
0c2a85ed 9396 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 9397 break;
61edafbb
PM		 9398 case NFT_MSG_NEWSETELEM:
9399 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 9400 nft_trans_elem(trans).priv, true);
61edafbb 9401 break;
e5009240 9402 case NFT_MSG_NEWOBJ:
00bfb320 9403 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 9404 break;
3b49e2e9 9405 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 9406 if (nft_trans_flowtable_update(trans))
9407 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9408 else
9409 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 9410 break;
c7c32e72
PNA		 9411 }
9412 kfree(trans);
9413}
9414
c0391b6a 9415static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
37082f93 9416{
d59d2f82 9417 struct nftables_pernet *nft_net = nft_pernet(net);
37082f93 9418 struct nft_trans *trans, *next;
02263db0 9419 struct nft_trans_elem *te;
37082f93 9420
c0391b6a
PNA		 9421 if (action == NFNL_ABORT_VALIDATE &&
9422 nf_tables_validate(net) < 0)
9423 return -EAGAIN;
9424
0854db2a 9425 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
a907e36d 9426 list) {
b380e5c7 9427 switch (trans->msg_type) {
55dd6f93
PNA		 9428 case NFT_MSG_NEWTABLE:
9429 if (nft_trans_table_update(trans)) {
179d9ba5
PNA		 9430 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9431 nft_trans_destroy(trans);
9432 break;
9433 }
9434 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
0ce7cf41 9435 nf_tables_table_disable(net, trans->ctx.table);
179d9ba5
PNA		 9436 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9437 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9438 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9439 }
9440 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
55dd6f93
PNA		 9441 nft_trans_destroy(trans);
9442 } else {
e688a7f8 9443 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 9444 }
9445 break;
9446 case NFT_MSG_DELTABLE:
f80a612d 9447 case NFT_MSG_DESTROYTABLE:
f2a6d766 9448 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 9449 nft_trans_destroy(trans);
9450 break;
91c7b38d
PNA		 9451 case NFT_MSG_NEWCHAIN:
9452 if (nft_trans_chain_update(trans)) {
982f4051 9453 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 9454 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 9455 nft_trans_destroy(trans);
9456 } else {
d0e2c7de
PNA		 9457 if (nft_chain_is_bound(trans->ctx.chain)) {
9458 nft_trans_destroy(trans);
9459 break;
9460 }
4fefee57 9461 trans->ctx.table->use--;
1b2470e5 9462 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 9463 nf_tables_unregister_hook(trans->ctx.net,
9464 trans->ctx.table,
9465 trans->ctx.chain);
91c7b38d
PNA		 9466 }
9467 break;
9468 case NFT_MSG_DELCHAIN:
f80a612d 9469 case NFT_MSG_DESTROYCHAIN:
4fefee57 9470 trans->ctx.table->use++;
664b0f8c 9471 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 9472 nft_trans_destroy(trans);
9473 break;
b380e5c7 9474 case NFT_MSG_NEWRULE:
4fefee57 9475 trans->ctx.chain->use--;
b380e5c7 9476 list_del_rcu(&nft_trans_rule(trans)->list);
f6ac8585
PNA		 9477 nft_rule_expr_deactivate(&trans->ctx,
9478 nft_trans_rule(trans),
9479 NFT_TRANS_ABORT);
3c5e4462
PNA		 9480 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9481 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
b380e5c7
PNA		 9482 break;
9483 case NFT_MSG_DELRULE:
f80a612d 9484 case NFT_MSG_DESTROYRULE:
4fefee57 9485 trans->ctx.chain->use++;
889f7ee7 9486 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 9487 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
3c5e4462
PNA		 9488 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9489 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9490
37082f93 9491 nft_trans_destroy(trans);
b380e5c7 9492 break;
958bee14 9493 case NFT_MSG_NEWSET:
123b9961
PNA		 9494 if (nft_trans_set_update(trans)) {
9495 nft_trans_destroy(trans);
9496 break;
9497 }
4fefee57 9498 trans->ctx.table->use--;
6a0a8d10 9499 if (nft_trans_set_bound(trans)) {
40ba1d9b
PNA		 9500 nft_trans_destroy(trans);
9501 break;
9502 }
9503 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 9504 break;
9505 case NFT_MSG_DELSET:
f80a612d 9506 case NFT_MSG_DESTROYSET:
4fefee57 9507 trans->ctx.table->use++;
37a9cc52 9508 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 9509 nft_trans_destroy(trans);
9510 break;
60319eb1 9511 case NFT_MSG_NEWSETELEM:
6a0a8d10 9512 if (nft_trans_elem_set_bound(trans)) {
40ba1d9b
PNA		 9513 nft_trans_destroy(trans);
9514 break;
9515 }
02263db0 9516 te = (struct nft_trans_elem *)trans->data;
aaa31047
PNA		 9517 nft_setelem_remove(net, te->set, &te->elem);
9518 if (!nft_setelem_is_catchall(te->set, &te->elem))
9519 atomic_dec(&te->set->nelems);
60319eb1
PNA		 9520 break;
9521 case NFT_MSG_DELSETELEM:
f80a612d 9522 case NFT_MSG_DESTROYSETELEM:
cc02e457
PM		 9523 te = (struct nft_trans_elem *)trans->data;
9524
f8bb7889 9525 nft_setelem_data_activate(net, te->set, &te->elem);
aaa31047
PNA		 9526 nft_setelem_activate(net, te->set, &te->elem);
9527 if (!nft_setelem_is_catchall(te->set, &te->elem))
9528 te->set->ndeact--;
cc02e457 9529
e5009240
PNA		 9530 nft_trans_destroy(trans);
9531 break;
9532 case NFT_MSG_NEWOBJ:
d62d0ba9 9533 if (nft_trans_obj_update(trans)) {
dad3bdee 9534 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
d62d0ba9
FFM		 9535 nft_trans_destroy(trans);
9536 } else {
9537 trans->ctx.table->use--;
9538 nft_obj_del(nft_trans_obj(trans));
9539 }
e5009240
PNA		 9540 break;
9541 case NFT_MSG_DELOBJ:
f80a612d 9542 case NFT_MSG_DESTROYOBJ:
e5009240
PNA		 9543 trans->ctx.table->use++;
9544 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 9545 nft_trans_destroy(trans);
9546 break;
3b49e2e9 9547 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 9548 if (nft_trans_flowtable_update(trans)) {
9549 nft_unregister_flowtable_net_hooks(net,
9550 &nft_trans_flowtable_hooks(trans));
9551 } else {
9552 trans->ctx.table->use--;
9553 list_del_rcu(&nft_trans_flowtable(trans)->list);
9554 nft_unregister_flowtable_net_hooks(net,
9555 &nft_trans_flowtable(trans)->hook_list);
9556 }
3b49e2e9
PNA		 9557 break;
9558 case NFT_MSG_DELFLOWTABLE:
f80a612d 9559 case NFT_MSG_DESTROYFLOWTABLE:
abadb2f8 9560 if (nft_trans_flowtable_update(trans)) {
b6d9014a
PNA		 9561 list_splice(&nft_trans_flowtable_hooks(trans),
9562 &nft_trans_flowtable(trans)->hook_list);
abadb2f8
PNA		 9563 } else {
9564 trans->ctx.table->use++;
9565 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9566 }
3b49e2e9
PNA		 9567 nft_trans_destroy(trans);
9568 break;
37082f93 9569 }
37082f93
PNA		 9570 }
9571
b326dd37
PNA		 9572 synchronize_rcu();
9573
a1cee076 9574 list_for_each_entry_safe_reverse(trans, next,
0854db2a 9575 &nft_net->commit_list, list) {
c7c32e72 9576 list_del(&trans->list);
b326dd37 9577 nf_tables_abort_release(trans);
37082f93
PNA		 9578 }
9579
c0391b6a 9580 if (action == NFNL_ABORT_AUTOLOAD)
eb014de4
PNA		 9581 nf_tables_module_autoload(net);
9582 else
9583 nf_tables_module_autoload_cleanup(net);
9584
37082f93
PNA		 9585 return 0;
9586}
9587
a654de8f
PNA		 9588static void nf_tables_cleanup(struct net *net)
9589{
9590 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9591}
9592
c0391b6a
PNA		 9593static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9594 enum nfnl_abort_action action)
71ad00c5 9595{
d59d2f82 9596 struct nftables_pernet *nft_net = nft_pernet(net);
c0391b6a 9597 int ret = __nf_tables_abort(net, action);
f102d66b 9598
0854db2a 9599 mutex_unlock(&nft_net->commit_mutex);
f102d66b
FW		 9600
9601 return ret;
71ad00c5
FW		 9602}
9603
74e8bcd2
PNA		 9604static bool nf_tables_valid_genid(struct net *net, u32 genid)
9605{
d59d2f82 9606 struct nftables_pernet *nft_net = nft_pernet(net);
f102d66b
FW		 9607 bool genid_ok;
9608
0854db2a 9609 mutex_lock(&nft_net->commit_mutex);
f102d66b 9610
0854db2a 9611 genid_ok = genid == 0 || nft_net->base_seq == genid;
f102d66b 9612 if (!genid_ok)
0854db2a 9613 mutex_unlock(&nft_net->commit_mutex);
f102d66b
FW		 9614
9615 /* else, commit mutex has to be released by commit or abort function */
9616 return genid_ok;
74e8bcd2
PNA		 9617}
9618
96518518
PM		 9619static const struct nfnetlink_subsystem nf_tables_subsys = {
9620 .name = "nf_tables",
9621 .subsys_id = NFNL_SUBSYS_NFTABLES,
9622 .cb_count = NFT_MSG_MAX,
9623 .cb = nf_tables_cb,
0628b123
PNA		 9624 .commit = nf_tables_commit,
9625 .abort = nf_tables_abort,
a654de8f 9626 .cleanup = nf_tables_cleanup,
74e8bcd2 9627 .valid_genid = nf_tables_valid_genid,
be2ab5b4 9628 .owner = THIS_MODULE,
96518518
PM		 9629};
9630
7210e4e3 9631int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 9632 enum nft_chain_types type)
7210e4e3
PNA		 9633{
9634 const struct nft_base_chain *basechain;
9635
f323d954 9636 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 9637 basechain = nft_base_chain(chain);
9638 if (basechain->type->type != type)
9639 return -EOPNOTSUPP;
9640 }
9641 return 0;
9642}
9643EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9644
75e8d06d
PNA		 9645int nft_chain_validate_hooks(const struct nft_chain *chain,
9646 unsigned int hook_flags)
9647{
9648 struct nft_base_chain *basechain;
9649
f323d954 9650 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 9651 basechain = nft_base_chain(chain);
9652
c974a3a3 9653 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 9654 return 0;
9655
9656 return -EOPNOTSUPP;
9657 }
9658
9659 return 0;
9660}
9661EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9662
20a69341
PM		 9663/*
9664 * Loop detection - walk through the ruleset beginning at the destination chain
9665 * of a new jump until either the source chain is reached (loop) or all
9666 * reachable chains have been traversed.
9667 *
9668 * The loop check is performed whenever a new jump verdict is added to an
9669 * expression or verdict map or a verdict map is bound to a new chain.
9670 */
9671
9672static int nf_tables_check_loops(const struct nft_ctx *ctx,
9673 const struct nft_chain *chain);
9674
6387aa6e
PNA		 9675static int nft_check_loops(const struct nft_ctx *ctx,
9676 const struct nft_set_ext *ext)
9677{
9678 const struct nft_data *data;
9679 int ret;
9680
9681 data = nft_set_ext_data(ext);
9682 switch (data->verdict.code) {
9683 case NFT_JUMP:
9684 case NFT_GOTO:
9685 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9686 break;
9687 default:
9688 ret = 0;
9689 break;
9690 }
9691
9692 return ret;
9693}
9694
20a69341 9695static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 9696 struct nft_set *set,
20a69341 9697 const struct nft_set_iter *iter,
de70185d 9698 struct nft_set_elem *elem)
20a69341 9699{
fe2811eb 9700 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
fe2811eb
PM		 9701
9702 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9703 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 9704 return 0;
9705
6387aa6e 9706 return nft_check_loops(ctx, ext);
20a69341
PM		 9707}
9708
aaa31047
PNA		 9709static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9710 struct nft_set *set)
9711{
9712 u8 genmask = nft_genmask_next(ctx->net);
9713 struct nft_set_elem_catchall *catchall;
9714 struct nft_set_ext *ext;
9715 int ret = 0;
9716
9717 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9718 ext = nft_set_elem_ext(set, catchall->elem);
9719 if (!nft_set_elem_active(ext, genmask))
9720 continue;
9721
9722 ret = nft_check_loops(ctx, ext);
9723 if (ret < 0)
9724 return ret;
9725 }
9726
9727 return ret;
9728}
9729
20a69341
PM		 9730static int nf_tables_check_loops(const struct nft_ctx *ctx,
9731 const struct nft_chain *chain)
9732{
9733 const struct nft_rule *rule;
9734 const struct nft_expr *expr, *last;
de70185d 9735 struct nft_set *set;
20a69341
PM		 9736 struct nft_set_binding *binding;
9737 struct nft_set_iter iter;
20a69341
PM		 9738
9739 if (ctx->chain == chain)
9740 return -ELOOP;
9741
9742 list_for_each_entry(rule, &chain->rules, list) {
9743 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 9744 struct nft_immediate_expr *priv;
9745 const struct nft_data *data;
0ca743a5
PNA		 9746 int err;
9747
a654de8f 9748 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 9749 continue;
9750
a654de8f
PNA		 9751 priv = nft_expr_priv(expr);
9752 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 9753 continue;
20a69341 9754
a654de8f 9755 data = &priv->data;
1ca2e170 9756 switch (data->verdict.code) {
20a69341
PM		 9757 case NFT_JUMP:
9758 case NFT_GOTO:
1ca2e170
PM		 9759 err = nf_tables_check_loops(ctx,
9760 data->verdict.chain);
20a69341
PM		 9761 if (err < 0)
9762 return err;
c2168e6b 9763 break;
20a69341
PM		 9764 default:
9765 break;
9766 }
9767 }
9768 }
9769
9770 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 9771 if (!nft_is_active_next(ctx->net, set))
9772 continue;
20a69341
PM		 9773 if (!(set->flags & NFT_SET_MAP) ||
9774 set->dtype != NFT_DATA_VERDICT)
9775 continue;
9776
9777 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 9778 if (!(binding->flags & NFT_SET_MAP) ||
9779 binding->chain != chain)
20a69341
PM		 9780 continue;
9781
8588ac09 9782 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 9783 iter.skip = 0;
9784 iter.count = 0;
9785 iter.err = 0;
9786 iter.fn = nf_tables_loop_check_setelem;
9787
9788 set->ops->walk(ctx, set, &iter);
aaa31047
PNA		 9789 if (!iter.err)
9790 iter.err = nft_set_catchall_loops(ctx, set);
9791
20a69341
PM		 9792 if (iter.err < 0)
9793 return iter.err;
9794 }
9795 }
9796
9797 return 0;
9798}
9799
36b701fa
LGL		 9800/**
9801 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9802 *
9803 * @attr: netlink attribute to fetch value from
9804 * @max: maximum value to be stored in dest
9805 * @dest: pointer to the variable
9806 *
9807 * Parse, check and store a given u32 netlink attribute into variable.
9808 * This function returns -ERANGE if the value goes over maximum value.
9809 * Otherwise a 0 is returned and the attribute value is stored in the
9810 * destination variable.
9811 */
f1d505bb 9812int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 9813{
09525a09 9814 u32 val;
36b701fa
LGL		 9815
9816 val = ntohl(nla_get_be32(attr));
9817 if (val > max)
9818 return -ERANGE;
9819
9820 *dest = val;
9821 return 0;
9822}
9823EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9824
6c6f9f31 9825static int nft_parse_register(const struct nlattr *attr, u32 *preg)
b1c96ed3 9826{
49499c3e
PM		 9827 unsigned int reg;
9828
9829 reg = ntohl(nla_get_be32(attr));
9830 switch (reg) {
9831 case NFT_REG_VERDICT...NFT_REG_4:
6e1acfa3
PNA		 9832 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9833 break;
9834 case NFT_REG32_00...NFT_REG32_15:
9835 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9836 break;
49499c3e 9837 default:
6e1acfa3 9838 return -ERANGE;
49499c3e 9839 }
6e1acfa3
PNA		 9840
9841 return 0;
b1c96ed3 9842}
b1c96ed3 9843
49499c3e
PM		 9844/**
9845 * nft_dump_register - dump a register value to a netlink attribute
9846 *
9847 * @skb: socket buffer
9848 * @attr: attribute number
9849 * @reg: register number
9850 *
9851 * Construct a netlink attribute containing the register number. For
9852 * compatibility reasons, register numbers being a multiple of 4 are
9853 * translated to the corresponding 128 bit register numbers.
9854 */
b1c96ed3
PM		 9855int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9856{
49499c3e
PM		 9857 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9858 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9859 else
9860 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9861
b1c96ed3
PM		 9862 return nla_put_be32(skb, attr, htonl(reg));
9863}
9864EXPORT_SYMBOL_GPL(nft_dump_register);
9865
4f16d25c 9866static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 9867{
49499c3e 9868 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 9869 return -EINVAL;
d07db988
PM		 9870 if (len == 0)
9871 return -EINVAL;
c593642c 9872 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
d07db988 9873 return -ERANGE;
49499c3e 9874
96518518
PM		 9875 return 0;
9876}
4f16d25c
PNA		 9877
9878int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9879{
9880 u32 reg;
9881 int err;
9882
6e1acfa3
PNA		 9883 err = nft_parse_register(attr, &reg);
9884 if (err < 0)
9885 return err;
9886
4f16d25c
PNA		 9887 err = nft_validate_register_load(reg, len);
9888 if (err < 0)
9889 return err;
9890
9891 *sreg = reg;
9892 return 0;
9893}
9894EXPORT_SYMBOL_GPL(nft_parse_register_load);
96518518 9895
345023b0
PNA		 9896static int nft_validate_register_store(const struct nft_ctx *ctx,
9897 enum nft_registers reg,
9898 const struct nft_data *data,
9899 enum nft_data_types type,
9900 unsigned int len)
96518518 9901{
20a69341
PM		 9902 int err;
9903
96518518
PM		 9904 switch (reg) {
9905 case NFT_REG_VERDICT:
58f40ab6 9906 if (type != NFT_DATA_VERDICT)
96518518 9907 return -EINVAL;
20a69341 9908
58f40ab6 9909 if (data != NULL &&
1ca2e170
PM		 9910 (data->verdict.code == NFT_GOTO ||
9911 data->verdict.code == NFT_JUMP)) {
9912 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 9913 if (err < 0)
9914 return err;
20a69341
PM		 9915 }
9916
96518518
PM		 9917 return 0;
9918 default:
49499c3e 9919 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 9920 return -EINVAL;
45d9bcda
PM		 9921 if (len == 0)
9922 return -EINVAL;
49499c3e 9923 if (reg * NFT_REG32_SIZE + len >
c593642c 9924 sizeof_field(struct nft_regs, data))
45d9bcda 9925 return -ERANGE;
27e6d201 9926
96518518
PM		 9927 if (data != NULL && type != NFT_DATA_VALUE)
9928 return -EINVAL;
9929 return 0;
9930 }
9931}
345023b0
PNA		 9932
9933int nft_parse_register_store(const struct nft_ctx *ctx,
9934 const struct nlattr *attr, u8 *dreg,
9935 const struct nft_data *data,
9936 enum nft_data_types type, unsigned int len)
9937{
9938 int err;
9939 u32 reg;
9940
6e1acfa3
PNA		 9941 err = nft_parse_register(attr, &reg);
9942 if (err < 0)
9943 return err;
9944
345023b0
PNA		 9945 err = nft_validate_register_store(ctx, reg, data, type, len);
9946 if (err < 0)
9947 return err;
9948
9949 *dreg = reg;
9950 return 0;
9951}
9952EXPORT_SYMBOL_GPL(nft_parse_register_store);
96518518
PM		 9953
9954static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9955 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9956 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9957 .len = NFT_CHAIN_MAXNAMELEN - 1 },
51d70f18 9958 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 9959};
9960
9961static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9962 struct nft_data_desc *desc, const struct nlattr *nla)
9963{
664b0f8c 9964 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 9965 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9966 struct nft_chain *chain;
9967 int err;
9968
8cb08174
JB		 9969 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9970 nft_verdict_policy, NULL);
96518518
PM		 9971 if (err < 0)
9972 return err;
9973
9974 if (!tb[NFTA_VERDICT_CODE])
9975 return -EINVAL;
1ca2e170 9976 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 9977
1ca2e170 9978 switch (data->verdict.code) {
e0abdadc 9979 default:
1ca2e170 9980 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 9981 case NF_ACCEPT:
9982 case NF_DROP:
9983 case NF_QUEUE:
9984 break;
9985 default:
9986 return -EINVAL;
9987 }
954d8297 9988 fallthrough;
96518518
PM		 9989 case NFT_CONTINUE:
9990 case NFT_BREAK:
9991 case NFT_RETURN:
96518518
PM		 9992 break;
9993 case NFT_JUMP:
9994 case NFT_GOTO:
51d70f18
PNA		 9995 if (tb[NFTA_VERDICT_CHAIN]) {
9996 chain = nft_chain_lookup(ctx->net, ctx->table,
9997 tb[NFTA_VERDICT_CHAIN],
9998 genmask);
9999 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
95f466d2 10000 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
51d70f18
PNA		 10001 tb[NFTA_VERDICT_CHAIN_ID]);
10002 if (IS_ERR(chain))
10003 return PTR_ERR(chain);
10004 } else {
96518518 10005 return -EINVAL;
51d70f18
PNA		 10006 }
10007
96518518
PM		 10008 if (IS_ERR(chain))
10009 return PTR_ERR(chain);
f323d954 10010 if (nft_is_base_chain(chain))
96518518 10011 return -EOPNOTSUPP;
e02f0d39
PNA		 10012 if (nft_chain_is_bound(chain))
10013 return -EINVAL;
f323ef3a
PNA		 10014 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10015 chain->flags & NFT_CHAIN_BINDING)
10016 return -EINVAL;
96518518 10017
96518518 10018 chain->use++;
1ca2e170 10019 data->verdict.chain = chain;
96518518 10020 break;
96518518
PM		 10021 }
10022
4c4ed074 10023 desc->len = sizeof(data->verdict);
341b6941 10024
96518518
PM		 10025 return 0;
10026}
10027
10028static void nft_verdict_uninit(const struct nft_data *data)
10029{
d0e2c7de
PNA		 10030 struct nft_chain *chain;
10031 struct nft_rule *rule;
10032
1ca2e170 10033 switch (data->verdict.code) {
96518518
PM		 10034 case NFT_JUMP:
10035 case NFT_GOTO:
d0e2c7de
PNA		 10036 chain = data->verdict.chain;
10037 chain->use--;
10038
10039 if (!nft_chain_is_bound(chain))
10040 break;
10041
10042 chain->table->use--;
10043 list_for_each_entry(rule, &chain->rules, list)
10044 chain->use--;
10045
10046 nft_chain_del(chain);
96518518
PM		 10047 break;
10048 }
10049}
10050
33d5a7b1 10051int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 10052{
10053 struct nlattr *nest;
10054
ae0be8de 10055 nest = nla_nest_start_noflag(skb, type);
96518518
PM		 10056 if (!nest)
10057 goto nla_put_failure;
10058
33d5a7b1 10059 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 10060 goto nla_put_failure;
10061
33d5a7b1 10062 switch (v->code) {
96518518
PM		 10063 case NFT_JUMP:
10064 case NFT_GOTO:
1ca2e170 10065 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 10066 v->chain->name))
96518518
PM		 10067 goto nla_put_failure;
10068 }
10069 nla_nest_end(skb, nest);
10070 return 0;
10071
10072nla_put_failure:
10073 return -1;
10074}
10075
d0a11fc3 10076static int nft_value_init(const struct nft_ctx *ctx,
341b6941
PNA		 10077 struct nft_data *data, struct nft_data_desc *desc,
10078 const struct nlattr *nla)
96518518
PM		 10079{
10080 unsigned int len;
10081
10082 len = nla_len(nla);
10083 if (len == 0)
10084 return -EINVAL;
341b6941 10085 if (len > desc->size)
96518518 10086 return -EOVERFLOW;
341b6941
PNA		 10087 if (desc->len) {
10088 if (len != desc->len)
10089 return -EINVAL;
10090 } else {
10091 desc->len = len;
10092 }
96518518 10093
d0a11fc3 10094 nla_memcpy(data->data, nla, len);
341b6941 10095
96518518
PM		 10096 return 0;
10097}
10098
10099static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10100 unsigned int len)
10101{
10102 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10103}
10104
10105static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 10106 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 10107 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10108};
10109
10110/**
10111 * nft_data_init - parse nf_tables data netlink attributes
10112 *
10113 * @ctx: context of the expression using the data
10114 * @data: destination struct nft_data
10115 * @desc: data description
10116 * @nla: netlink attribute containing data
10117 *
10118 * Parse the netlink data attributes and initialize a struct nft_data.
10119 * The type and length of data are returned in the data description.
10120 *
10121 * The caller can indicate that it only wants to accept data of type
10122 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10123 */
341b6941 10124int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
96518518
PM		 10125 struct nft_data_desc *desc, const struct nlattr *nla)
10126{
10127 struct nlattr *tb[NFTA_DATA_MAX + 1];
10128 int err;
10129
341b6941
PNA		 10130 if (WARN_ON_ONCE(!desc->size))
10131 return -EINVAL;
10132
8cb08174
JB		 10133 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10134 nft_data_policy, NULL);
96518518
PM		 10135 if (err < 0)
10136 return err;
10137
341b6941
PNA		 10138 if (tb[NFTA_DATA_VALUE]) {
10139 if (desc->type != NFT_DATA_VALUE)
10140 return -EINVAL;
10141
10142 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10143 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10144 if (desc->type != NFT_DATA_VERDICT)
10145 return -EINVAL;
10146
10147 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10148 } else {
10149 err = -EINVAL;
10150 }
10151
10152 return err;
96518518
PM		 10153}
10154EXPORT_SYMBOL_GPL(nft_data_init);
10155
10156/**
59105446 10157 * nft_data_release - release a nft_data item
96518518
PM		 10158 *
10159 * @data: struct nft_data to release
10160 * @type: type of data
10161 *
10162 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10163 * all others need to be released by calling this function.
10164 */
59105446 10165void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 10166{
960bd2c2 10167 if (type < NFT_DATA_VERDICT)
96518518 10168 return;
960bd2c2 10169 switch (type) {
96518518
PM		 10170 case NFT_DATA_VERDICT:
10171 return nft_verdict_uninit(data);
10172 default:
10173 WARN_ON(1);
10174 }
10175}
59105446 10176EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 10177
10178int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10179 enum nft_data_types type, unsigned int len)
10180{
10181 struct nlattr *nest;
10182 int err;
10183
ae0be8de 10184 nest = nla_nest_start_noflag(skb, attr);
96518518
PM		 10185 if (nest == NULL)
10186 return -1;
10187
10188 switch (type) {
10189 case NFT_DATA_VALUE:
10190 err = nft_value_dump(skb, data, len);
10191 break;
10192 case NFT_DATA_VERDICT:
33d5a7b1 10193 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 10194 break;
10195 default:
10196 err = -EINVAL;
10197 WARN_ON(1);
10198 }
10199
10200 nla_nest_end(skb, nest);
10201 return err;
10202}
10203EXPORT_SYMBOL_GPL(nft_data_dump);
10204
5ebe0b0e
PNA		 10205int __nft_release_basechain(struct nft_ctx *ctx)
10206{
10207 struct nft_rule *rule, *nr;
10208
fa5950e4
FW		 10209 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10210 return 0;
5ebe0b0e 10211
c974a3a3 10212 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 10213 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10214 list_del(&rule->list);
10215 ctx->chain->use--;
bb7b40ae 10216 nf_tables_rule_release(ctx, rule);
5ebe0b0e 10217 }
1b2470e5 10218 nft_chain_del(ctx->chain);
5ebe0b0e 10219 ctx->table->use--;
43a605f2 10220 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 10221
10222 return 0;
10223}
10224EXPORT_SYMBOL_GPL(__nft_release_basechain);
10225
00dfe9be
PNA		 10226static void __nft_release_hook(struct net *net, struct nft_table *table)
10227{
6069da44 10228 struct nft_flowtable *flowtable;
00dfe9be
PNA		 10229 struct nft_chain *chain;
10230
10231 list_for_each_entry(chain, &table->chains, list)
f9a43007 10232 __nf_tables_unregister_hook(net, table, chain, true);
6069da44 10233 list_for_each_entry(flowtable, &table->flowtables, list)
f9a43007
PNA		 10234 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10235 true);
00dfe9be
PNA		 10236}
10237
767d1216
PNA		 10238static void __nft_release_hooks(struct net *net)
10239{
d59d2f82 10240 struct nftables_pernet *nft_net = nft_pernet(net);
767d1216 10241 struct nft_table *table;
767d1216 10242
0854db2a 10243 list_for_each_entry(table, &nft_net->tables, list) {
2888b080
PNA		 10244 if (nft_table_has_owner(table))
10245 continue;
10246
00dfe9be 10247 __nft_release_hook(net, table);
2888b080 10248 }
767d1216
PNA		 10249}
10250
fd020332 10251static void __nft_release_table(struct net *net, struct nft_table *table)
df05ef87 10252{
3b49e2e9 10253 struct nft_flowtable *flowtable, *nf;
df05ef87 10254 struct nft_chain *chain, *nc;
e5009240 10255 struct nft_object *obj, *ne;
df05ef87
PNA		 10256 struct nft_rule *rule, *nr;
10257 struct nft_set *set, *ns;
10258 struct nft_ctx ctx = {
10259 .net = net,
43a605f2 10260 .family = NFPROTO_NETDEV,
df05ef87
PNA		 10261 };
10262
fd020332
PNA		 10263 ctx.family = table->family;
10264 ctx.table = table;
10265 list_for_each_entry(chain, &table->chains, list) {
10266 ctx.chain = chain;
10267 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10268 list_del(&rule->list);
10269 chain->use--;
10270 nf_tables_rule_release(&ctx, rule);
df05ef87 10271 }
df05ef87 10272 }
fd020332
PNA		 10273 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10274 list_del(&flowtable->list);
10275 table->use--;
10276 nf_tables_flowtable_destroy(flowtable);
10277 }
10278 list_for_each_entry_safe(set, ns, &table->sets, list) {
10279 list_del(&set->list);
10280 table->use--;
10281 nft_set_destroy(&ctx, set);
10282 }
10283 list_for_each_entry_safe(obj, ne, &table->objects, list) {
10284 nft_obj_del(obj);
10285 table->use--;
10286 nft_obj_destroy(&ctx, obj);
10287 }
10288 list_for_each_entry_safe(chain, nc, &table->chains, list) {
10289 ctx.chain = chain;
10290 nft_chain_del(chain);
10291 table->use--;
10292 nf_tables_chain_destroy(&ctx);
10293 }
fd020332
PNA		 10294 nf_tables_table_destroy(&ctx);
10295}
10296
bd1777b3 10297static void __nft_release_tables(struct net *net)
fd020332 10298{
d59d2f82 10299 struct nftables_pernet *nft_net = nft_pernet(net);
fd020332
PNA		 10300 struct nft_table *table, *nt;
10301
0854db2a 10302 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
bd1777b3 10303 if (nft_table_has_owner(table))
6001a930
PNA		 10304 continue;
10305
a499b03b
FW		 10306 list_del(&table->list);
10307
fd020332 10308 __nft_release_table(net, table);
6001a930
PNA		 10309 }
10310}
10311
10312static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10313 void *ptr)
10314{
a499b03b 10315 struct nft_table *table, *to_delete[8];
0854db2a 10316 struct nftables_pernet *nft_net;
6001a930 10317 struct netlink_notify *n = ptr;
6001a930 10318 struct net *net = n->net;
a499b03b
FW		 10319 unsigned int deleted;
10320 bool restart = false;
6001a930
PNA		 10321
10322 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10323 return NOTIFY_DONE;
10324
d59d2f82 10325 nft_net = nft_pernet(net);
a499b03b 10326 deleted = 0;
0854db2a 10327 mutex_lock(&nft_net->commit_mutex);
d4bc8271
PNA		 10328 if (!list_empty(&nf_tables_destroy_list))
10329 rcu_barrier();
a499b03b 10330again:
0854db2a 10331 list_for_each_entry(table, &nft_net->tables, list) {
6001a930
PNA		 10332 if (nft_table_has_owner(table) &&
10333 n->portid == table->nlpid) {
10334 __nft_release_hook(net, table);
a499b03b
FW		 10335 list_del_rcu(&table->list);
10336 to_delete[deleted++] = table;
10337 if (deleted >= ARRAY_SIZE(to_delete))
10338 break;
6001a930
PNA		 10339 }
10340 }
a499b03b
FW		 10341 if (deleted) {
10342 restart = deleted >= ARRAY_SIZE(to_delete);
6001a930 10343 synchronize_rcu();
a499b03b
FW		 10344 while (deleted)
10345 __nft_release_table(net, to_delete[--deleted]);
10346
10347 if (restart)
10348 goto again;
6001a930 10349 }
0854db2a 10350 mutex_unlock(&nft_net->commit_mutex);
6001a930
PNA		 10351
10352 return NOTIFY_DONE;
df05ef87
PNA		 10353}
10354
6001a930
PNA		 10355static struct notifier_block nft_nl_notifier = {
10356 .notifier_call = nft_rcv_nl_event,
10357};
10358
dd4cbef7
PNA		 10359static int __net_init nf_tables_init_net(struct net *net)
10360{
d59d2f82 10361 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 10362
10363 INIT_LIST_HEAD(&nft_net->tables);
10364 INIT_LIST_HEAD(&nft_net->commit_list);
10365 INIT_LIST_HEAD(&nft_net->module_list);
10366 INIT_LIST_HEAD(&nft_net->notify_list);
10367 mutex_init(&nft_net->commit_mutex);
10368 nft_net->base_seq = 1;
10369 nft_net->validate_state = NFT_VALIDATE_SKIP;
a654de8f 10370
dd4cbef7
PNA		 10371 return 0;
10372}
10373
767d1216
PNA		 10374static void __net_exit nf_tables_pre_exit_net(struct net *net)
10375{
3923b1e4
PNA		 10376 struct nftables_pernet *nft_net = nft_pernet(net);
10377
10378 mutex_lock(&nft_net->commit_mutex);
767d1216 10379 __nft_release_hooks(net);
3923b1e4 10380 mutex_unlock(&nft_net->commit_mutex);
767d1216
PNA		 10381}
10382
dd4cbef7
PNA		 10383static void __net_exit nf_tables_exit_net(struct net *net)
10384{
d59d2f82 10385 struct nftables_pernet *nft_net = nft_pernet(net);
0854db2a
FW		 10386
10387 mutex_lock(&nft_net->commit_mutex);
03c1f1ef
SY		 10388 if (!list_empty(&nft_net->commit_list) ||
10389 !list_empty(&nft_net->module_list))
c0391b6a 10390 __nf_tables_abort(net, NFNL_ABORT_NONE);
bd1777b3 10391 __nft_release_tables(net);
0854db2a
FW		 10392 mutex_unlock(&nft_net->commit_mutex);
10393 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10394 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10395 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
dd4cbef7
PNA		 10396}
10397
99633ab2 10398static struct pernet_operations nf_tables_net_ops = {
767d1216
PNA		 10399 .init = nf_tables_init_net,
10400 .pre_exit = nf_tables_pre_exit_net,
10401 .exit = nf_tables_exit_net,
0854db2a
FW		 10402 .id = &nf_tables_net_id,
10403 .size = sizeof(struct nftables_pernet),
99633ab2
PNA		 10404};
10405
96518518
PM		 10406static int __init nf_tables_module_init(void)
10407{
10408 int err;
10409
d209df3e
FW		 10410 err = register_pernet_subsys(&nf_tables_net_ops);
10411 if (err < 0)
10412 return err;
10413
10414 err = nft_chain_filter_init();
10415 if (err < 0)
6001a930 10416 goto err_chain_filter;
02c7b25e 10417
96518518
PM		 10418 err = nf_tables_core_module_init();
10419 if (err < 0)
6001a930 10420 goto err_core_module;
96518518 10421
d209df3e 10422 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
96518518 10423 if (err < 0)
6001a930 10424 goto err_netdev_notifier;
96518518 10425
4d44175a
FW		 10426 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10427 if (err < 0)
6001a930 10428 goto err_rht_objname;
4d44175a 10429
06d392cb 10430 err = nft_offload_init();
10431 if (err < 0)
6001a930
PNA		 10432 goto err_offload;
10433
10434 err = netlink_register_notifier(&nft_nl_notifier);
10435 if (err < 0)
10436 goto err_netlink_notifier;
06d392cb 10437
d209df3e
FW		 10438 /* must be last */
10439 err = nfnetlink_subsys_register(&nf_tables_subsys);
10440 if (err < 0)
6001a930 10441 goto err_nfnl_subsys;
3b49e2e9 10442
c1deb065 10443 nft_chain_route_init();
3474a2c6 10444
d209df3e 10445 return err;
6001a930
PNA		 10446
10447err_nfnl_subsys:
10448 netlink_unregister_notifier(&nft_nl_notifier);
10449err_netlink_notifier:
06d392cb 10450 nft_offload_exit();
6001a930 10451err_offload:
4d44175a 10452 rhltable_destroy(&nft_objname_ht);
6001a930 10453err_rht_objname:
d209df3e 10454 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
6001a930 10455err_netdev_notifier:
96518518 10456 nf_tables_core_module_exit();
6001a930 10457err_core_module:
d209df3e 10458 nft_chain_filter_fini();
6001a930 10459err_chain_filter:
d209df3e 10460 unregister_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 10461 return err;
10462}
10463
10464static void __exit nf_tables_module_exit(void)
10465{
10466 nfnetlink_subsys_unregister(&nf_tables_subsys);
6001a930 10467 netlink_unregister_notifier(&nft_nl_notifier);
06d392cb 10468 nft_offload_exit();
3b49e2e9 10469 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 10470 nft_chain_filter_fini();
c1deb065 10471 nft_chain_route_fini();
71ad00c5 10472 unregister_pernet_subsys(&nf_tables_net_ops);
0935d558 10473 cancel_work_sync(&trans_destroy_work);
1b1bc49c 10474 rcu_barrier();
4d44175a 10475 rhltable_destroy(&nft_objname_ht);
96518518 10476 nf_tables_core_module_exit();
96518518
PM		 10477}
10478
10479module_init(nf_tables_module_init);
10480module_exit(nf_tables_module_exit);
10481
10482MODULE_LICENSE("GPL");
10483MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10484MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux 6.x block layer and io_uring tree(s)