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netfilter: nftables: introduce table ownership
[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
96518518 28static LIST_HEAD(nf_tables_expressions);
e5009240 29static LIST_HEAD(nf_tables_objects);
3b49e2e9 30static LIST_HEAD(nf_tables_flowtables);
0935d558
FW		 31static LIST_HEAD(nf_tables_destroy_list);
32static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
3ecbfd65 33static u64 table_handle;
96518518 34
a654de8f
PNA		 35enum {
36 NFT_VALIDATE_SKIP = 0,
37 NFT_VALIDATE_NEED,
38 NFT_VALIDATE_DO,
39};
40
4d44175a
FW		 41static struct rhltable nft_objname_ht;
42
1b2470e5
FW		 43static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
44static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
45static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
46
4d44175a
FW		 47static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
48static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
49static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
50
1b2470e5
FW		 51static const struct rhashtable_params nft_chain_ht_params = {
52 .head_offset = offsetof(struct nft_chain, rhlhead),
53 .key_offset = offsetof(struct nft_chain, name),
54 .hashfn = nft_chain_hash,
55 .obj_hashfn = nft_chain_hash_obj,
56 .obj_cmpfn = nft_chain_hash_cmp,
1b2470e5
FW		 57 .automatic_shrinking = true,
58};
59
4d44175a
FW		 60static const struct rhashtable_params nft_objname_ht_params = {
61 .head_offset = offsetof(struct nft_object, rhlhead),
62 .key_offset = offsetof(struct nft_object, key),
63 .hashfn = nft_objname_hash,
64 .obj_hashfn = nft_objname_hash_obj,
65 .obj_cmpfn = nft_objname_hash_cmp,
66 .automatic_shrinking = true,
67};
68
a654de8f
PNA		 69static void nft_validate_state_update(struct net *net, u8 new_validate_state)
70{
71 switch (net->nft.validate_state) {
72 case NFT_VALIDATE_SKIP:
73 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
74 break;
75 case NFT_VALIDATE_NEED:
76 break;
77 case NFT_VALIDATE_DO:
78 if (new_validate_state == NFT_VALIDATE_NEED)
79 return;
80 }
81
82 net->nft.validate_state = new_validate_state;
83}
0935d558
FW		 84static void nf_tables_trans_destroy_work(struct work_struct *w);
85static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
a654de8f 86
7c95f6d8 87static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 88 struct net *net,
7c95f6d8
PNA		 89 const struct sk_buff *skb,
90 const struct nlmsghdr *nlh,
36596dad 91 u8 family,
7c95f6d8
PNA		 92 struct nft_table *table,
93 struct nft_chain *chain,
94 const struct nlattr * const *nla)
95{
633c9a84 96 ctx->net = net;
36596dad 97 ctx->family = family;
26b2f552 98 ctx->level = 0;
128ad332
PNA		 99 ctx->table = table;
100 ctx->chain = chain;
101 ctx->nla = nla;
102 ctx->portid = NETLINK_CB(skb).portid;
103 ctx->report = nlmsg_report(nlh);
c9626a2c 104 ctx->flags = nlh->nlmsg_flags;
128ad332 105 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 106}
107
8411b644
PNA		 108static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
109 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 110{
111 struct nft_trans *trans;
112
8411b644 113 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 114 if (trans == NULL)
115 return NULL;
116
b380e5c7 117 trans->msg_type = msg_type;
1081d11b
PNA		 118 trans->ctx = *ctx;
119
120 return trans;
121}
122
8411b644
PNA		 123static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
124 int msg_type, u32 size)
125{
126 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
127}
128
1081d11b
PNA		 129static void nft_trans_destroy(struct nft_trans *trans)
130{
131 list_del(&trans->list);
132 kfree(trans);
133}
134
f6ac8585
PNA		 135static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
136{
137 struct net *net = ctx->net;
138 struct nft_trans *trans;
139
140 if (!nft_set_is_anonymous(set))
141 return;
142
143 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
6a0a8d10
PNA		 144 switch (trans->msg_type) {
145 case NFT_MSG_NEWSET:
146 if (nft_trans_set(trans) == set)
147 nft_trans_set_bound(trans) = true;
148 break;
149 case NFT_MSG_NEWSETELEM:
150 if (nft_trans_elem_set(trans) == set)
151 nft_trans_elem_set_bound(trans) = true;
f6ac8585
PNA		 152 break;
153 }
154 }
155}
156
d54725cd
PNA		 157static int nft_netdev_register_hooks(struct net *net,
158 struct list_head *hook_list)
159{
160 struct nft_hook *hook;
161 int err, j;
162
163 j = 0;
164 list_for_each_entry(hook, hook_list, list) {
165 err = nf_register_net_hook(net, &hook->ops);
166 if (err < 0)
167 goto err_register;
168
169 j++;
170 }
171 return 0;
172
173err_register:
174 list_for_each_entry(hook, hook_list, list) {
175 if (j-- <= 0)
176 break;
177
178 nf_unregister_net_hook(net, &hook->ops);
179 }
180 return err;
181}
182
183static void nft_netdev_unregister_hooks(struct net *net,
184 struct list_head *hook_list)
185{
186 struct nft_hook *hook;
187
188 list_for_each_entry(hook, hook_list, list)
189 nf_unregister_net_hook(net, &hook->ops);
190}
191
c974a3a3
PNA		 192static int nf_tables_register_hook(struct net *net,
193 const struct nft_table *table,
194 struct nft_chain *chain)
d8ee8f7c 195{
d54725cd 196 struct nft_base_chain *basechain;
a37061a6 197 const struct nf_hook_ops *ops;
ae6153b5 198
d8ee8f7c 199 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 200 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 201 return 0;
202
4e25ceb8
FW		 203 basechain = nft_base_chain(chain);
204 ops = &basechain->ops;
ae6153b5 205
4e25ceb8
FW		 206 if (basechain->type->ops_register)
207 return basechain->type->ops_register(net, ops);
208
d3519cb8 209 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
1e9451cb
FW		 210 return nft_netdev_register_hooks(net, &basechain->hook_list);
211
212 return nf_register_net_hook(net, &basechain->ops);
d8ee8f7c
PNA		 213}
214
c974a3a3
PNA		 215static void nf_tables_unregister_hook(struct net *net,
216 const struct nft_table *table,
217 struct nft_chain *chain)
c5598794 218{
d54725cd 219 struct nft_base_chain *basechain;
4e25ceb8
FW		 220 const struct nf_hook_ops *ops;
221
d8ee8f7c 222 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 223 !nft_is_base_chain(chain))
d8ee8f7c 224 return;
4e25ceb8
FW		 225 basechain = nft_base_chain(chain);
226 ops = &basechain->ops;
d8ee8f7c 227
4e25ceb8
FW		 228 if (basechain->type->ops_unregister)
229 return basechain->type->ops_unregister(net, ops);
230
d3519cb8 231 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
1e9451cb
FW		 232 nft_netdev_unregister_hooks(net, &basechain->hook_list);
233 else
234 nf_unregister_net_hook(net, &basechain->ops);
c5598794
AB		 235}
236
ee01d542
AB		 237static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
238{
239 struct nft_trans *trans;
240
241 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
242 if (trans == NULL)
243 return -ENOMEM;
244
245 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 246 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 247
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
249 return 0;
250}
251
252static int nft_deltable(struct nft_ctx *ctx)
253{
254 int err;
255
256 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
257 if (err < 0)
258 return err;
259
f2a6d766 260 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 261 return err;
262}
263
66293c46 264static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
ee01d542
AB		 265{
266 struct nft_trans *trans;
267
268 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
269 if (trans == NULL)
66293c46 270 return ERR_PTR(-ENOMEM);
ee01d542 271
74cccc3d 272 if (msg_type == NFT_MSG_NEWCHAIN) {
664b0f8c 273 nft_activate_next(ctx->net, ctx->chain);
ee01d542 274
74cccc3d
PNA		 275 if (ctx->nla[NFTA_CHAIN_ID]) {
276 nft_trans_chain_id(trans) =
277 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
278 }
279 }
280
ee01d542 281 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
66293c46 282 return trans;
ee01d542
AB		 283}
284
285static int nft_delchain(struct nft_ctx *ctx)
286{
66293c46 287 struct nft_trans *trans;
ee01d542 288
66293c46
FW		 289 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
290 if (IS_ERR(trans))
291 return PTR_ERR(trans);
ee01d542
AB		 292
293 ctx->table->use--;
664b0f8c 294 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542 295
66293c46 296 return 0;
ee01d542
AB		 297}
298
bb7b40ae
PNA		 299static void nft_rule_expr_activate(const struct nft_ctx *ctx,
300 struct nft_rule *rule)
301{
302 struct nft_expr *expr;
303
304 expr = nft_expr_first(rule);
31cc578a 305 while (nft_expr_more(rule, expr)) {
bb7b40ae
PNA		 306 if (expr->ops->activate)
307 expr->ops->activate(ctx, expr);
308
309 expr = nft_expr_next(expr);
310 }
311}
312
313static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
f6ac8585
PNA		 314 struct nft_rule *rule,
315 enum nft_trans_phase phase)
bb7b40ae
PNA		 316{
317 struct nft_expr *expr;
318
319 expr = nft_expr_first(rule);
31cc578a 320 while (nft_expr_more(rule, expr)) {
bb7b40ae 321 if (expr->ops->deactivate)
f6ac8585 322 expr->ops->deactivate(ctx, expr, phase);
bb7b40ae
PNA		 323
324 expr = nft_expr_next(expr);
325 }
326}
327
ee01d542
AB		 328static int
329nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
330{
331 /* You cannot delete the same rule twice */
889f7ee7
PNA		 332 if (nft_is_active_next(ctx->net, rule)) {
333 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 334 ctx->chain->use--;
335 return 0;
336 }
337 return -ENOENT;
338}
339
340static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
341 struct nft_rule *rule)
342{
343 struct nft_trans *trans;
344
345 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
346 if (trans == NULL)
347 return NULL;
348
1a94e38d
PNA		 349 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
350 nft_trans_rule_id(trans) =
351 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
352 }
ee01d542
AB		 353 nft_trans_rule(trans) = rule;
354 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
355
356 return trans;
357}
358
359static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
360{
63b48c73 361 struct nft_flow_rule *flow;
ee01d542
AB		 362 struct nft_trans *trans;
363 int err;
364
365 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
366 if (trans == NULL)
367 return -ENOMEM;
368
63b48c73
PNA		 369 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
370 flow = nft_flow_rule_create(ctx->net, rule);
371 if (IS_ERR(flow)) {
372 nft_trans_destroy(trans);
373 return PTR_ERR(flow);
374 }
375
376 nft_trans_flow_rule(trans) = flow;
377 }
378
ee01d542
AB		 379 err = nf_tables_delrule_deactivate(ctx, rule);
380 if (err < 0) {
381 nft_trans_destroy(trans);
382 return err;
383 }
f6ac8585 384 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
ee01d542
AB		 385
386 return 0;
387}
388
389static int nft_delrule_by_chain(struct nft_ctx *ctx)
390{
391 struct nft_rule *rule;
392 int err;
393
394 list_for_each_entry(rule, &ctx->chain->rules, list) {
23b7ca4f
PNA		 395 if (!nft_is_active_next(ctx->net, rule))
396 continue;
397
ee01d542
AB		 398 err = nft_delrule(ctx, rule);
399 if (err < 0)
400 return err;
401 }
402 return 0;
403}
404
cd5125d8 405static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
ee01d542
AB		 406 struct nft_set *set)
407{
408 struct nft_trans *trans;
409
410 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
411 if (trans == NULL)
412 return -ENOMEM;
413
414 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
415 nft_trans_set_id(trans) =
416 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 417 nft_activate_next(ctx->net, set);
ee01d542
AB		 418 }
419 nft_trans_set(trans) = set;
420 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
421
422 return 0;
423}
424
cd5125d8 425static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
ee01d542
AB		 426{
427 int err;
428
429 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
430 if (err < 0)
431 return err;
432
37a9cc52 433 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 434 ctx->table->use--;
435
436 return err;
437}
438
e5009240
PNA		 439static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
440 struct nft_object *obj)
441{
442 struct nft_trans *trans;
443
444 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
445 if (trans == NULL)
446 return -ENOMEM;
447
448 if (msg_type == NFT_MSG_NEWOBJ)
449 nft_activate_next(ctx->net, obj);
450
451 nft_trans_obj(trans) = obj;
452 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
453
454 return 0;
455}
456
457static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
458{
459 int err;
460
461 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
462 if (err < 0)
463 return err;
464
465 nft_deactivate_next(ctx->net, obj);
466 ctx->table->use--;
467
468 return err;
469}
470
3b49e2e9
PNA		 471static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
472 struct nft_flowtable *flowtable)
473{
474 struct nft_trans *trans;
475
476 trans = nft_trans_alloc(ctx, msg_type,
477 sizeof(struct nft_trans_flowtable));
478 if (trans == NULL)
479 return -ENOMEM;
480
481 if (msg_type == NFT_MSG_NEWFLOWTABLE)
482 nft_activate_next(ctx->net, flowtable);
483
484 nft_trans_flowtable(trans) = flowtable;
485 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
486
487 return 0;
488}
489
490static int nft_delflowtable(struct nft_ctx *ctx,
491 struct nft_flowtable *flowtable)
492{
493 int err;
494
495 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
496 if (err < 0)
497 return err;
498
499 nft_deactivate_next(ctx->net, flowtable);
500 ctx->table->use--;
501
502 return err;
503}
504
96518518
PM		 505/*
506 * Tables
507 */
508
36596dad 509static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 510 const struct nlattr *nla,
6001a930 511 u8 family, u8 genmask, u32 nlpid)
96518518
PM		 512{
513 struct nft_table *table;
514
cac20fcd
PNA		 515 if (nla == NULL)
516 return ERR_PTR(-EINVAL);
517
0a6a9515
QC		 518 list_for_each_entry_rcu(table, &net->nft.tables, list,
519 lockdep_is_held(&net->nft.commit_mutex)) {
f2a6d766 520 if (!nla_strcmp(nla, table->name) &&
98319cb9 521 table->family == family &&
6001a930
PNA		 522 nft_active_genmask(table, genmask)) {
523 if (nft_table_has_owner(table) &&
524 table->nlpid != nlpid)
525 return ERR_PTR(-EPERM);
526
96518518 527 return table;
6001a930 528 }
96518518 529 }
cac20fcd
PNA		 530
531 return ERR_PTR(-ENOENT);
96518518
PM		 532}
533
3ecbfd65
HS		 534static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
535 const struct nlattr *nla,
536 u8 genmask)
537{
538 struct nft_table *table;
539
540 list_for_each_entry(table, &net->nft.tables, list) {
541 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
542 nft_active_genmask(table, genmask))
543 return table;
544 }
3ecbfd65
HS		 545
546 return ERR_PTR(-ENOENT);
547}
548
96518518
PM		 549static inline u64 nf_tables_alloc_handle(struct nft_table *table)
550{
551 return ++table->hgenerator;
552}
553
32537e91 554static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 555
82603549
PNA		 556static const struct nft_chain_type *
557__nft_chain_type_get(u8 family, enum nft_chain_types type)
558{
559 if (family >= NFPROTO_NUMPROTO ||
560 type >= NFT_CHAIN_T_MAX)
561 return NULL;
562
563 return chain_type[family][type];
564}
565
32537e91 566static const struct nft_chain_type *
1ea26cca 567__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c 568{
82603549 569 const struct nft_chain_type *type;
9370761c
PNA		 570 int i;
571
baae3e62 572 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
82603549
PNA		 573 type = __nft_chain_type_get(family, i);
574 if (!type)
575 continue;
576 if (!nla_strcmp(nla, type->name))
577 return type;
9370761c 578 }
baae3e62 579 return NULL;
9370761c
PNA		 580}
581
eb014de4
PNA		 582struct nft_module_request {
583 struct list_head list;
584 char module[MODULE_NAME_LEN];
585 bool done;
586};
587
452238e8 588#ifdef CONFIG_MODULES
35b7ee34
AL		 589static __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
590 ...)
452238e8
FW		 591{
592 char module_name[MODULE_NAME_LEN];
eb014de4 593 struct nft_module_request *req;
452238e8
FW		 594 va_list args;
595 int ret;
596
452238e8
FW		 597 va_start(args, fmt);
598 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
599 va_end(args);
9332d27d 600 if (ret >= MODULE_NAME_LEN)
eb014de4 601 return 0;
452238e8 602
eb014de4
PNA		 603 list_for_each_entry(req, &net->nft.module_list, list) {
604 if (!strcmp(req->module, module_name)) {
605 if (req->done)
606 return 0;
ec7470b8 607
eb014de4
PNA		 608 /* A request to load this module already exists. */
609 return -EAGAIN;
610 }
611 }
612
613 req = kmalloc(sizeof(*req), GFP_KERNEL);
614 if (!req)
615 return -ENOMEM;
616
617 req->done = false;
618 strlcpy(req->module, module_name, MODULE_NAME_LEN);
619 list_add_tail(&req->list, &net->nft.module_list);
620
621 return -EAGAIN;
452238e8
FW		 622}
623#endif
624
f102d66b
FW		 625static void lockdep_nfnl_nft_mutex_not_held(void)
626{
627#ifdef CONFIG_PROVE_LOCKING
c0700dfa
FW		 628 if (debug_locks)
629 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
f102d66b
FW		 630#endif
631}
632
32537e91 633static const struct nft_chain_type *
452238e8
FW		 634nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
635 u8 family, bool autoload)
9370761c 636{
32537e91 637 const struct nft_chain_type *type;
9370761c 638
1ea26cca 639 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 640 if (type != NULL)
641 return type;
f102d66b
FW		 642
643 lockdep_nfnl_nft_mutex_not_held();
9370761c 644#ifdef CONFIG_MODULES
93b0806f 645 if (autoload) {
eb014de4
PNA		 646 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
647 nla_len(nla),
648 (const char *)nla_data(nla)) == -EAGAIN)
93b0806f 649 return ERR_PTR(-EAGAIN);
9370761c
PNA		 650 }
651#endif
93b0806f 652 return ERR_PTR(-ENOENT);
9370761c
PNA		 653}
654
96518518 655static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 656 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
657 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 658 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 659 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
7a81575b
JGG		 660 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
661 .len = NFT_USERDATA_MAXLEN }
96518518
PM		 662};
663
84d7fce6
PNA		 664static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
665 u32 portid, u32 seq, int event, u32 flags,
666 int family, const struct nft_table *table)
96518518
PM		 667{
668 struct nlmsghdr *nlh;
669 struct nfgenmsg *nfmsg;
670
dedb67c4 671 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 672 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
673 if (nlh == NULL)
674 goto nla_put_failure;
675
676 nfmsg = nlmsg_data(nlh);
677 nfmsg->nfgen_family = family;
678 nfmsg->version = NFNETLINK_V0;
84d7fce6 679 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 680
9ddf6323 681 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768 682 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
3ecbfd65
HS		 683 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
684 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
685 NFTA_TABLE_PAD))
96518518 686 goto nla_put_failure;
6001a930
PNA		 687 if (nft_table_has_owner(table) &&
688 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
689 goto nla_put_failure;
96518518 690
7a81575b
JGG		 691 if (table->udata) {
692 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
693 goto nla_put_failure;
694 }
695
053c095a
JB		 696 nlmsg_end(skb, nlh);
697 return 0;
96518518
PM		 698
699nla_put_failure:
700 nlmsg_trim(skb, nlh);
701 return -1;
702}
703
67cc570e
PNA		 704struct nftnl_skb_parms {
705 bool report;
706};
707#define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
708
709static void nft_notify_enqueue(struct sk_buff *skb, bool report,
710 struct list_head *notify_list)
711{
712 NFT_CB(skb).report = report;
713 list_add_tail(&skb->list, notify_list);
714}
715
25e94a99 716static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 717{
718 struct sk_buff *skb;
96518518 719 int err;
8e6cf365
RGB		 720 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
721 ctx->table->name, ctx->table->handle);
722
723 audit_log_nfcfg(buf,
724 ctx->family,
725 ctx->table->use,
726 event == NFT_MSG_NEWTABLE ?
727 AUDIT_NFT_OP_TABLE_REGISTER :
14224039
RGB		 728 AUDIT_NFT_OP_TABLE_UNREGISTER,
729 GFP_KERNEL);
8e6cf365 730 kfree(buf);
96518518 731
128ad332
PNA		 732 if (!ctx->report &&
733 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 734 return;
96518518 735
96518518
PM		 736 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
737 if (skb == NULL)
738 goto err;
739
84d7fce6 740 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 741 event, 0, ctx->family, ctx->table);
96518518
PM		 742 if (err < 0) {
743 kfree_skb(skb);
744 goto err;
745 }
746
67cc570e 747 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
25e94a99 748 return;
96518518 749err:
25e94a99 750 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 751}
752
753static int nf_tables_dump_tables(struct sk_buff *skb,
754 struct netlink_callback *cb)
755{
756 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 757 const struct nft_table *table;
758 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 759 struct net *net = sock_net(skb->sk);
96518518
PM		 760 int family = nfmsg->nfgen_family;
761
e688a7f8 762 rcu_read_lock();
38e029f1
PNA		 763 cb->seq = net->nft.base_seq;
764
36596dad 765 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 766 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 767 continue;
768
36596dad
PNA		 769 if (idx < s_idx)
770 goto cont;
771 if (idx > s_idx)
772 memset(&cb->args[1], 0,
773 sizeof(cb->args) - sizeof(cb->args[0]));
774 if (!nft_is_active(net, table))
775 continue;
776 if (nf_tables_fill_table_info(skb, net,
777 NETLINK_CB(cb->skb).portid,
778 cb->nlh->nlmsg_seq,
779 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 780 table->family, table) < 0)
36596dad
PNA		 781 goto done;
782
783 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 784cont:
36596dad 785 idx++;
96518518
PM		 786 }
787done:
e688a7f8 788 rcu_read_unlock();
96518518
PM		 789 cb->args[0] = idx;
790 return skb->len;
791}
792
d9adf22a
FW		 793static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
794 const struct nlmsghdr *nlh,
795 struct netlink_dump_control *c)
796{
797 int err;
798
799 if (!try_module_get(THIS_MODULE))
800 return -EINVAL;
801
802 rcu_read_unlock();
803 err = netlink_dump_start(nlsk, skb, nlh, c);
804 rcu_read_lock();
805 module_put(THIS_MODULE);
806
807 return err;
808}
809
810/* called with rcu_read_lock held */
7b8002a1
PNA		 811static int nf_tables_gettable(struct net *net, struct sock *nlsk,
812 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 813 const struct nlattr * const nla[],
814 struct netlink_ext_ack *extack)
96518518
PM		 815{
816 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 817 u8 genmask = nft_genmask_cur(net);
96518518
PM		 818 const struct nft_table *table;
819 struct sk_buff *skb2;
820 int family = nfmsg->nfgen_family;
821 int err;
822
823 if (nlh->nlmsg_flags & NLM_F_DUMP) {
824 struct netlink_dump_control c = {
825 .dump = nf_tables_dump_tables,
d9adf22a 826 .module = THIS_MODULE,
96518518 827 };
d9adf22a
FW		 828
829 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 830 }
831
6001a930 832 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
36dd1bcc
PNA		 833 if (IS_ERR(table)) {
834 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 835 return PTR_ERR(table);
36dd1bcc 836 }
96518518 837
d9adf22a 838 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 839 if (!skb2)
840 return -ENOMEM;
841
84d7fce6 842 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 843 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
844 family, table);
845 if (err < 0)
ee921183 846 goto err_fill_table_info;
96518518 847
ee921183 848 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 849
ee921183 850err_fill_table_info:
96518518
PM		 851 kfree_skb(skb2);
852 return err;
853}
854
c9c17211 855static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 856{
857 struct nft_chain *chain;
858 u32 i = 0;
859
860 list_for_each_entry(chain, &table->chains, list) {
861 if (!nft_is_active_next(net, chain))
862 continue;
f323d954 863 if (!nft_is_base_chain(chain))
10435c11
F		 864 continue;
865
866 if (cnt && i++ == cnt)
867 break;
868
1e9451cb 869 nf_tables_unregister_hook(net, table, chain);
10435c11
F		 870 }
871}
872
c9c17211 873static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 874{
875 struct nft_chain *chain;
876 int err, i = 0;
877
878 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 879 if (!nft_is_active_next(net, chain))
880 continue;
f323d954 881 if (!nft_is_base_chain(chain))
d2012975
PNA		 882 continue;
883
1e9451cb 884 err = nf_tables_register_hook(net, table, chain);
9ddf6323 885 if (err < 0)
d54725cd 886 goto err_register_hooks;
9ddf6323
PNA		 887
888 i++;
889 }
890 return 0;
d54725cd
PNA		 891
892err_register_hooks:
10435c11 893 if (i)
c9c17211 894 nft_table_disable(net, table, i);
9ddf6323
PNA		 895 return err;
896}
897
c9c17211 898static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 899{
c9c17211 900 nft_table_disable(net, table, 0);
9ddf6323
PNA		 901}
902
e1aaca93 903static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 904{
55dd6f93 905 struct nft_trans *trans;
e1aaca93 906 u32 flags;
55dd6f93 907 int ret = 0;
9ddf6323 908
e1aaca93
PNA		 909 if (!ctx->nla[NFTA_TABLE_FLAGS])
910 return 0;
9ddf6323 911
e1aaca93 912 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
6001a930
PNA		 913 if (flags & ~NFT_TABLE_F_MASK)
914 return -EOPNOTSUPP;
e1aaca93 915
63283dd2
PNA		 916 if (flags == ctx->table->flags)
917 return 0;
918
55dd6f93
PNA		 919 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
920 sizeof(struct nft_trans_table));
921 if (trans == NULL)
922 return -ENOMEM;
9ddf6323 923
e1aaca93
PNA		 924 if ((flags & NFT_TABLE_F_DORMANT) &&
925 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 926 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 927 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
928 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1e9451cb 929 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
c9c17211 930 ret = nf_tables_table_enable(ctx->net, ctx->table);
1e9451cb 931 if (ret >= 0)
55dd6f93 932 nft_trans_table_enable(trans) = true;
1e9451cb
FW		 933 else
934 ctx->table->flags |= NFT_TABLE_F_DORMANT;
9ddf6323 935 }
e1aaca93
PNA		 936 if (ret < 0)
937 goto err;
9ddf6323 938
55dd6f93
PNA		 939 nft_trans_table_update(trans) = true;
940 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
941 return 0;
9ddf6323 942err:
55dd6f93 943 nft_trans_destroy(trans);
9ddf6323
PNA		 944 return ret;
945}
946
1b2470e5
FW		 947static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
948{
949 const char *name = data;
950
951 return jhash(name, strlen(name), seed);
952}
953
954static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
955{
956 const struct nft_chain *chain = data;
957
958 return nft_chain_hash(chain->name, 0, seed);
959}
960
961static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
962 const void *ptr)
963{
964 const struct nft_chain *chain = ptr;
965 const char *name = arg->key;
966
967 return strcmp(chain->name, name);
968}
969
4d44175a
FW		 970static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
971{
972 const struct nft_object_hash_key *k = data;
973
974 seed ^= hash_ptr(k->table, 32);
975
976 return jhash(k->name, strlen(k->name), seed);
977}
978
979static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
980{
981 const struct nft_object *obj = data;
982
983 return nft_objname_hash(&obj->key, 0, seed);
984}
985
986static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
987 const void *ptr)
988{
989 const struct nft_object_hash_key *k = arg->key;
990 const struct nft_object *obj = ptr;
991
992 if (obj->key.table != k->table)
993 return -1;
994
995 return strcmp(obj->key.name, k->name);
996}
997
633c9a84
PNA		 998static int nf_tables_newtable(struct net *net, struct sock *nlsk,
999 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1000 const struct nlattr * const nla[],
1001 struct netlink_ext_ack *extack)
96518518
PM		 1002{
1003 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1004 u8 genmask = nft_genmask_next(net);
96518518 1005 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 1006 const struct nlattr *attr;
1007 struct nft_table *table;
e1aaca93 1008 struct nft_ctx ctx;
7a81575b 1009 u32 flags = 0;
55dd6f93 1010 int err;
96518518 1011
f102d66b 1012 lockdep_assert_held(&net->nft.commit_mutex);
36dd1bcc 1013 attr = nla[NFTA_TABLE_NAME];
6001a930
PNA		 1014 table = nft_table_lookup(net, attr, family, genmask,
1015 NETLINK_CB(skb).portid);
96518518
PM		 1016 if (IS_ERR(table)) {
1017 if (PTR_ERR(table) != -ENOENT)
1018 return PTR_ERR(table);
1a28ad74 1019 } else {
36dd1bcc
PNA		 1020 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1021 NL_SET_BAD_ATTR(extack, attr);
96518518 1022 return -EEXIST;
36dd1bcc 1023 }
96518518
PM		 1024 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1025 return -EOPNOTSUPP;
e1aaca93 1026
98319cb9 1027 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e1aaca93 1028 return nf_tables_updtable(&ctx);
96518518
PM		 1029 }
1030
c5c1f975
PM		 1031 if (nla[NFTA_TABLE_FLAGS]) {
1032 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
6001a930
PNA		 1033 if (flags & ~NFT_TABLE_F_MASK)
1034 return -EOPNOTSUPP;
c5c1f975
PM		 1035 }
1036
ffdb210e 1037 err = -ENOMEM;
1cae565e 1038 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 1039 if (table == NULL)
98319cb9 1040 goto err_kzalloc;
96518518 1041
36dd1bcc 1042 table->name = nla_strdup(attr, GFP_KERNEL);
e46abbcc 1043 if (table->name == NULL)
98319cb9 1044 goto err_strdup;
e46abbcc 1045
7a81575b 1046 if (nla[NFTA_TABLE_USERDATA]) {
85db827a 1047 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
7a81575b
JGG		 1048 if (table->udata == NULL)
1049 goto err_table_udata;
1050
85db827a 1051 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
7a81575b
JGG		 1052 }
1053
1b2470e5
FW		 1054 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1055 if (err)
1056 goto err_chain_ht;
1057
96518518 1058 INIT_LIST_HEAD(&table->chains);
20a69341 1059 INIT_LIST_HEAD(&table->sets);
e5009240 1060 INIT_LIST_HEAD(&table->objects);
3b49e2e9 1061 INIT_LIST_HEAD(&table->flowtables);
98319cb9 1062 table->family = family;
c5c1f975 1063 table->flags = flags;
3ecbfd65 1064 table->handle = ++table_handle;
6001a930
PNA		 1065 if (table->flags & NFT_TABLE_F_OWNER)
1066 table->nlpid = NETLINK_CB(skb).portid;
9ddf6323 1067
98319cb9 1068 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
55dd6f93 1069 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 1070 if (err < 0)
98319cb9 1071 goto err_trans;
ffdb210e 1072
36596dad 1073 list_add_tail_rcu(&table->list, &net->nft.tables);
96518518 1074 return 0;
98319cb9 1075err_trans:
1b2470e5
FW		 1076 rhltable_destroy(&table->chains_ht);
1077err_chain_ht:
7a81575b
JGG		 1078 kfree(table->udata);
1079err_table_udata:
e46abbcc 1080 kfree(table->name);
98319cb9 1081err_strdup:
ffdb210e 1082 kfree(table);
98319cb9 1083err_kzalloc:
ffdb210e 1084 return err;
96518518
PM		 1085}
1086
b9ac12ef
AB		 1087static int nft_flush_table(struct nft_ctx *ctx)
1088{
3b49e2e9 1089 struct nft_flowtable *flowtable, *nft;
b9ac12ef 1090 struct nft_chain *chain, *nc;
e5009240 1091 struct nft_object *obj, *ne;
b9ac12ef 1092 struct nft_set *set, *ns;
3b49e2e9 1093 int err;
b9ac12ef 1094
a2f18db0 1095 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 1096 if (!nft_is_active_next(ctx->net, chain))
1097 continue;
1098
d0e2c7de
PNA		 1099 if (nft_chain_is_bound(chain))
1100 continue;
1101
b9ac12ef
AB		 1102 ctx->chain = chain;
1103
1104 err = nft_delrule_by_chain(ctx);
1105 if (err < 0)
1106 goto out;
b9ac12ef
AB		 1107 }
1108
1109 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 1110 if (!nft_is_active_next(ctx->net, set))
1111 continue;
1112
408070d6 1113 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 1114 !list_empty(&set->bindings))
1115 continue;
1116
1117 err = nft_delset(ctx, set);
1118 if (err < 0)
1119 goto out;
1120 }
1121
3b49e2e9 1122 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
335178d5
FW		 1123 if (!nft_is_active_next(ctx->net, flowtable))
1124 continue;
1125
3b49e2e9
PNA		 1126 err = nft_delflowtable(ctx, flowtable);
1127 if (err < 0)
1128 goto out;
1129 }
1130
e5009240 1131 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
335178d5
FW		 1132 if (!nft_is_active_next(ctx->net, obj))
1133 continue;
1134
e5009240
PNA		 1135 err = nft_delobj(ctx, obj);
1136 if (err < 0)
1137 goto out;
1138 }
1139
a2f18db0 1140 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 1141 if (!nft_is_active_next(ctx->net, chain))
1142 continue;
1143
d0e2c7de
PNA		 1144 if (nft_chain_is_bound(chain))
1145 continue;
1146
a2f18db0
PNA		 1147 ctx->chain = chain;
1148
1149 err = nft_delchain(ctx);
1150 if (err < 0)
1151 goto out;
1152 }
1153
b9ac12ef
AB		 1154 err = nft_deltable(ctx);
1155out:
1156 return err;
1157}
1158
1159static int nft_flush(struct nft_ctx *ctx, int family)
1160{
b9ac12ef
AB		 1161 struct nft_table *table, *nt;
1162 const struct nlattr * const *nla = ctx->nla;
1163 int err = 0;
1164
36596dad 1165 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
98319cb9 1166 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 1167 continue;
1168
98319cb9 1169 ctx->family = table->family;
f2a6d766 1170
36596dad
PNA		 1171 if (!nft_is_active_next(ctx->net, table))
1172 continue;
b9ac12ef 1173
6001a930
PNA		 1174 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1175 continue;
1176
36596dad
PNA		 1177 if (nla[NFTA_TABLE_NAME] &&
1178 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1179 continue;
b9ac12ef 1180
36596dad
PNA		 1181 ctx->table = table;
1182
1183 err = nft_flush_table(ctx);
1184 if (err < 0)
1185 goto out;
b9ac12ef
AB		 1186 }
1187out:
1188 return err;
1189}
1190
633c9a84
PNA		 1191static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1192 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1193 const struct nlattr * const nla[],
1194 struct netlink_ext_ack *extack)
96518518
PM		 1195{
1196 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1197 u8 genmask = nft_genmask_next(net);
ee01d542 1198 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 1199 const struct nlattr *attr;
1200 struct nft_table *table;
55dd6f93 1201 struct nft_ctx ctx;
96518518 1202
36596dad 1203 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 1204 if (family == AF_UNSPEC ||
1205 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 1206 return nft_flush(&ctx, family);
1207
36dd1bcc
PNA		 1208 if (nla[NFTA_TABLE_HANDLE]) {
1209 attr = nla[NFTA_TABLE_HANDLE];
1210 table = nft_table_lookup_byhandle(net, attr, genmask);
1211 } else {
1212 attr = nla[NFTA_TABLE_NAME];
6001a930
PNA		 1213 table = nft_table_lookup(net, attr, family, genmask,
1214 NETLINK_CB(skb).portid);
36dd1bcc 1215 }
3ecbfd65 1216
36dd1bcc
PNA		 1217 if (IS_ERR(table)) {
1218 NL_SET_BAD_ATTR(extack, attr);
96518518 1219 return PTR_ERR(table);
36dd1bcc 1220 }
96518518 1221
a8278400
PNA		 1222 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1223 table->use > 0)
1224 return -EBUSY;
1225
98319cb9 1226 ctx.family = family;
b9ac12ef 1227 ctx.table = table;
55dd6f93 1228
b9ac12ef 1229 return nft_flush_table(&ctx);
96518518
PM		 1230}
1231
55dd6f93
PNA		 1232static void nf_tables_table_destroy(struct nft_ctx *ctx)
1233{
fa5950e4
FW		 1234 if (WARN_ON(ctx->table->use > 0))
1235 return;
4fefee57 1236
1b2470e5 1237 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1238 kfree(ctx->table->name);
bc7a7082 1239 kfree(ctx->table->udata);
55dd6f93 1240 kfree(ctx->table);
55dd6f93
PNA		 1241}
1242
cc07eeb0 1243void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1244{
96518518 1245 nfnl_lock(NFNL_SUBSYS_NFTABLES);
82603549 1246 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
cc07eeb0
PNA		 1247 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1248 return;
96518518 1249 }
9370761c 1250 chain_type[ctype->family][ctype->type] = ctype;
96518518 1251 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1252}
9370761c 1253EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1254
32537e91 1255void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1256{
96518518 1257 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1258 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1259 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1260}
9370761c 1261EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1262
1263/*
1264 * Chains
1265 */
1266
1267static struct nft_chain *
cac20fcd 1268nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1269{
1270 struct nft_chain *chain;
1271
1272 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1273 if (chain->handle == handle &&
1274 nft_active_genmask(chain, genmask))
96518518
PM		 1275 return chain;
1276 }
1277
1278 return ERR_PTR(-ENOENT);
1279}
1280
4d44175a 1281static bool lockdep_commit_lock_is_held(const struct net *net)
f102d66b
FW		 1282{
1283#ifdef CONFIG_PROVE_LOCKING
1284 return lockdep_is_held(&net->nft.commit_mutex);
1285#else
1286 return true;
1287#endif
1288}
1289
1290static struct nft_chain *nft_chain_lookup(struct net *net,
1291 struct nft_table *table,
cac20fcd 1292 const struct nlattr *nla, u8 genmask)
96518518 1293{
1b2470e5
FW		 1294 char search[NFT_CHAIN_MAXNAMELEN + 1];
1295 struct rhlist_head *tmp, *list;
96518518
PM		 1296 struct nft_chain *chain;
1297
1298 if (nla == NULL)
1299 return ERR_PTR(-EINVAL);
1300
872f6903 1301 nla_strscpy(search, nla, sizeof(search));
96518518 1302
1b2470e5 1303 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1304 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1305
1306 chain = ERR_PTR(-ENOENT);
1307 rcu_read_lock();
1308 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1309 if (!list)
1310 goto out_unlock;
1311
1312 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1313 if (nft_active_genmask(chain, genmask))
1314 goto out_unlock;
1315 }
1316 chain = ERR_PTR(-ENOENT);
1317out_unlock:
1318 rcu_read_unlock();
1319 return chain;
96518518
PM		 1320}
1321
1322static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1323 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1324 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1325 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1326 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1327 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1328 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1329 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
9332d27d
FW		 1330 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1331 .len = NFT_MODULE_AUTOLOAD_LIMIT },
0ca743a5 1332 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
c9626a2c 1333 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
74cccc3d 1334 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
002f2176
JGG		 1335 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1336 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1337};
1338
1339static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1340 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1341 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1342 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1343 .len = IFNAMSIZ - 1 },
96518518
PM		 1344};
1345
0ca743a5
PNA		 1346static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1347{
1348 struct nft_stats *cpu_stats, total;
1349 struct nlattr *nest;
ce355e20
ED		 1350 unsigned int seq;
1351 u64 pkts, bytes;
0ca743a5
PNA		 1352 int cpu;
1353
edbd82c5
FW		 1354 if (!stats)
1355 return 0;
1356
0ca743a5
PNA		 1357 memset(&total, 0, sizeof(total));
1358 for_each_possible_cpu(cpu) {
1359 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 1360 do {
1361 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1362 pkts = cpu_stats->pkts;
1363 bytes = cpu_stats->bytes;
1364 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1365 total.pkts += pkts;
1366 total.bytes += bytes;
0ca743a5 1367 }
ae0be8de 1368 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
0ca743a5
PNA		 1369 if (nest == NULL)
1370 goto nla_put_failure;
1371
b46f6ded
ND		 1372 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1373 NFTA_COUNTER_PAD) ||
1374 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1375 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1376 goto nla_put_failure;
1377
1378 nla_nest_end(skb, nest);
1379 return 0;
1380
1381nla_put_failure:
1382 return -ENOSPC;
1383}
1384
d54725cd
PNA		 1385static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1386 const struct nft_base_chain *basechain)
1387{
1388 const struct nf_hook_ops *ops = &basechain->ops;
1389 struct nft_hook *hook, *first = NULL;
1390 struct nlattr *nest, *nest_devs;
1391 int n = 0;
1392
1393 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1394 if (nest == NULL)
1395 goto nla_put_failure;
1396 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1397 goto nla_put_failure;
1398 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1399 goto nla_put_failure;
1400
d3519cb8 1401 if (nft_base_chain_netdev(family, ops->hooknum)) {
d54725cd
PNA		 1402 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1403 list_for_each_entry(hook, &basechain->hook_list, list) {
1404 if (!first)
1405 first = hook;
1406
1407 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1408 hook->ops.dev->name))
1409 goto nla_put_failure;
1410 n++;
1411 }
1412 nla_nest_end(skb, nest_devs);
1413
1414 if (n == 1 &&
1415 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1416 goto nla_put_failure;
1417 }
1418 nla_nest_end(skb, nest);
1419
1420 return 0;
1421nla_put_failure:
1422 return -1;
1423}
1424
84d7fce6
PNA		 1425static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1426 u32 portid, u32 seq, int event, u32 flags,
1427 int family, const struct nft_table *table,
96518518
PM		 1428 const struct nft_chain *chain)
1429{
1430 struct nlmsghdr *nlh;
1431 struct nfgenmsg *nfmsg;
1432
dedb67c4 1433 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1434 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1435 if (nlh == NULL)
1436 goto nla_put_failure;
1437
1438 nfmsg = nlmsg_data(nlh);
1439 nfmsg->nfgen_family = family;
1440 nfmsg->version = NFNETLINK_V0;
84d7fce6 1441 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1442
1443 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1444 goto nla_put_failure;
b46f6ded
ND		 1445 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1446 NFTA_CHAIN_PAD))
96518518
PM		 1447 goto nla_put_failure;
1448 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1449 goto nla_put_failure;
1450
f323d954 1451 if (nft_is_base_chain(chain)) {
0ca743a5 1452 const struct nft_base_chain *basechain = nft_base_chain(chain);
edbd82c5 1453 struct nft_stats __percpu *stats;
0ca743a5 1454
d54725cd 1455 if (nft_dump_basechain_hook(skb, family, basechain))
2cbce139 1456 goto nla_put_failure;
9370761c 1457
0ca743a5
PNA		 1458 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1459 htonl(basechain->policy)))
1460 goto nla_put_failure;
1461
baae3e62
PM		 1462 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1463 goto nla_put_failure;
0ca743a5 1464
edbd82c5
FW		 1465 stats = rcu_dereference_check(basechain->stats,
1466 lockdep_commit_lock_is_held(net));
1467 if (nft_dump_stats(skb, stats))
0ca743a5 1468 goto nla_put_failure;
96518518
PM		 1469 }
1470
d0e2c7de
PNA		 1471 if (chain->flags &&
1472 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1473 goto nla_put_failure;
1474
0ca743a5
PNA		 1475 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1476 goto nla_put_failure;
1477
002f2176
JGG		 1478 if (chain->udata &&
1479 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1480 goto nla_put_failure;
1481
053c095a
JB		 1482 nlmsg_end(skb, nlh);
1483 return 0;
96518518
PM		 1484
1485nla_put_failure:
1486 nlmsg_trim(skb, nlh);
1487 return -1;
1488}
1489
25e94a99 1490static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1491{
1492 struct sk_buff *skb;
96518518 1493 int err;
8e6cf365
RGB		 1494 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1495 ctx->table->name, ctx->table->handle,
1496 ctx->chain->name, ctx->chain->handle);
1497
1498 audit_log_nfcfg(buf,
1499 ctx->family,
1500 ctx->chain->use,
1501 event == NFT_MSG_NEWCHAIN ?
1502 AUDIT_NFT_OP_CHAIN_REGISTER :
14224039
RGB		 1503 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1504 GFP_KERNEL);
8e6cf365 1505 kfree(buf);
96518518 1506
128ad332
PNA		 1507 if (!ctx->report &&
1508 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1509 return;
96518518 1510
96518518
PM		 1511 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1512 if (skb == NULL)
1513 goto err;
1514
84d7fce6 1515 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 1516 event, 0, ctx->family, ctx->table,
35151d84 1517 ctx->chain);
96518518
PM		 1518 if (err < 0) {
1519 kfree_skb(skb);
1520 goto err;
1521 }
1522
67cc570e 1523 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
25e94a99 1524 return;
96518518 1525err:
25e94a99 1526 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1527}
1528
1529static int nf_tables_dump_chains(struct sk_buff *skb,
1530 struct netlink_callback *cb)
1531{
1532 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 1533 const struct nft_table *table;
1534 const struct nft_chain *chain;
1535 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1536 struct net *net = sock_net(skb->sk);
96518518
PM		 1537 int family = nfmsg->nfgen_family;
1538
e688a7f8 1539 rcu_read_lock();
38e029f1
PNA		 1540 cb->seq = net->nft.base_seq;
1541
36596dad 1542 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 1543 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1544 continue;
1545
36596dad
PNA		 1546 list_for_each_entry_rcu(chain, &table->chains, list) {
1547 if (idx < s_idx)
1548 goto cont;
1549 if (idx > s_idx)
1550 memset(&cb->args[1], 0,
1551 sizeof(cb->args) - sizeof(cb->args[0]));
1552 if (!nft_is_active(net, chain))
1553 continue;
1554 if (nf_tables_fill_chain_info(skb, net,
1555 NETLINK_CB(cb->skb).portid,
1556 cb->nlh->nlmsg_seq,
1557 NFT_MSG_NEWCHAIN,
1558 NLM_F_MULTI,
98319cb9 1559 table->family, table,
36596dad
PNA		 1560 chain) < 0)
1561 goto done;
38e029f1 1562
36596dad 1563 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1564cont:
36596dad 1565 idx++;
96518518
PM		 1566 }
1567 }
1568done:
e688a7f8 1569 rcu_read_unlock();
96518518
PM		 1570 cb->args[0] = idx;
1571 return skb->len;
1572}
1573
d9adf22a 1574/* called with rcu_read_lock held */
7b8002a1
PNA		 1575static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1576 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1577 const struct nlattr * const nla[],
1578 struct netlink_ext_ack *extack)
96518518
PM		 1579{
1580 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1581 u8 genmask = nft_genmask_cur(net);
96518518 1582 const struct nft_chain *chain;
1b2470e5 1583 struct nft_table *table;
96518518
PM		 1584 struct sk_buff *skb2;
1585 int family = nfmsg->nfgen_family;
1586 int err;
1587
1588 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1589 struct netlink_dump_control c = {
1590 .dump = nf_tables_dump_chains,
d9adf22a 1591 .module = THIS_MODULE,
96518518 1592 };
d9adf22a
FW		 1593
1594 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 1595 }
1596
6001a930 1597 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
36dd1bcc
PNA		 1598 if (IS_ERR(table)) {
1599 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1600 return PTR_ERR(table);
36dd1bcc 1601 }
96518518 1602
f102d66b 1603 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1604 if (IS_ERR(chain)) {
1605 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1606 return PTR_ERR(chain);
36dd1bcc 1607 }
96518518 1608
d9adf22a 1609 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1610 if (!skb2)
1611 return -ENOMEM;
1612
84d7fce6 1613 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1614 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1615 family, table, chain);
1616 if (err < 0)
ee921183 1617 goto err_fill_chain_info;
96518518 1618
ee921183 1619 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 1620
ee921183 1621err_fill_chain_info:
96518518
PM		 1622 kfree_skb(skb2);
1623 return err;
1624}
1625
0ca743a5
PNA		 1626static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1627 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1628 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1629};
1630
ff3cd7b3 1631static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1632{
1633 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1634 struct nft_stats __percpu *newstats;
1635 struct nft_stats *stats;
1636 int err;
1637
8cb08174
JB		 1638 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1639 nft_counter_policy, NULL);
0ca743a5 1640 if (err < 0)
ff3cd7b3 1641 return ERR_PTR(err);
0ca743a5
PNA		 1642
1643 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1644 return ERR_PTR(-EINVAL);
0ca743a5 1645
ce355e20 1646 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1647 if (newstats == NULL)
ff3cd7b3 1648 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1649
1650 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1651 * are not exposed to userspace.
1652 */
e8781f70 1653 preempt_disable();
0ca743a5
PNA		 1654 stats = this_cpu_ptr(newstats);
1655 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1656 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1657 preempt_enable();
0ca743a5 1658
ff3cd7b3
PNA		 1659 return newstats;
1660}
1661
53315ac6 1662static void nft_chain_stats_replace(struct nft_trans *trans)
ff3cd7b3 1663{
53315ac6 1664 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
0befd061 1665
53315ac6 1666 if (!nft_trans_chain_stats(trans))
b88825de
PNA		 1667 return;
1668
b685b534
PM		 1669 nft_trans_chain_stats(trans) =
1670 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1671 lockdep_commit_lock_is_held(trans->ctx.net));
53315ac6
FW		 1672
1673 if (!nft_trans_chain_stats(trans))
bbb8c61f 1674 static_branch_inc(&nft_counters_enabled);
0ca743a5
PNA		 1675}
1676
0cbc06b3
FW		 1677static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1678{
1679 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1680 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1681
1682 if (g0 != g1)
1683 kvfree(g1);
1684 kvfree(g0);
1685
1686 /* should be NULL either via abort or via successful commit */
1687 WARN_ON_ONCE(chain->rules_next);
1688 kvfree(chain->rules_next);
1689}
1690
d0e2c7de 1691void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1692{
43a605f2 1693 struct nft_chain *chain = ctx->chain;
d54725cd 1694 struct nft_hook *hook, *next;
43a605f2 1695
fa5950e4
FW		 1696 if (WARN_ON(chain->use > 0))
1697 return;
91c7b38d 1698
0cbc06b3
FW		 1699 /* no concurrent access possible anymore */
1700 nf_tables_chain_free_chain_rules(chain);
1701
f323d954 1702 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1703 struct nft_base_chain *basechain = nft_base_chain(chain);
1704
d3519cb8 1705 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
d54725cd
PNA		 1706 list_for_each_entry_safe(hook, next,
1707 &basechain->hook_list, list) {
1708 list_del_rcu(&hook->list);
1709 kfree_rcu(hook, rcu);
1710 }
1711 }
2cbce139 1712 module_put(basechain->type->owner);
4c05ec47 1713 if (rcu_access_pointer(basechain->stats)) {
9f08ea84 1714 static_branch_dec(&nft_counters_enabled);
4c05ec47
TY		 1715 free_percpu(rcu_dereference_raw(basechain->stats));
1716 }
b7263e07 1717 kfree(chain->name);
002f2176 1718 kfree(chain->udata);
2cbce139 1719 kfree(basechain);
91c7b38d 1720 } else {
b7263e07 1721 kfree(chain->name);
002f2176 1722 kfree(chain->udata);
91c7b38d
PNA		 1723 kfree(chain);
1724 }
1725}
1726
3f0465a9
PNA		 1727static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1728 const struct nlattr *attr)
1729{
1730 struct net_device *dev;
1731 char ifname[IFNAMSIZ];
1732 struct nft_hook *hook;
1733 int err;
1734
1735 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1736 if (!hook) {
1737 err = -ENOMEM;
1738 goto err_hook_alloc;
1739 }
1740
872f6903 1741 nla_strscpy(ifname, attr, IFNAMSIZ);
42f1c271
PNA		 1742 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1743 * indirectly serializing all the other holders of the commit_mutex with
1744 * the rtnl_mutex.
1745 */
3f0465a9
PNA		 1746 dev = __dev_get_by_name(net, ifname);
1747 if (!dev) {
1748 err = -ENOENT;
1749 goto err_hook_dev;
1750 }
1751 hook->ops.dev = dev;
abadb2f8 1752 hook->inactive = false;
3f0465a9
PNA		 1753
1754 return hook;
1755
1756err_hook_dev:
1757 kfree(hook);
1758err_hook_alloc:
1759 return ERR_PTR(err);
1760}
1761
abadb2f8
PNA		 1762static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1763 const struct nft_hook *this)
b75a3e83
PNA		 1764{
1765 struct nft_hook *hook;
1766
1767 list_for_each_entry(hook, hook_list, list) {
1768 if (this->ops.dev == hook->ops.dev)
abadb2f8 1769 return hook;
b75a3e83
PNA		 1770 }
1771
abadb2f8 1772 return NULL;
b75a3e83
PNA		 1773}
1774
3f0465a9
PNA		 1775static int nf_tables_parse_netdev_hooks(struct net *net,
1776 const struct nlattr *attr,
1777 struct list_head *hook_list)
1778{
1779 struct nft_hook *hook, *next;
1780 const struct nlattr *tmp;
1781 int rem, n = 0, err;
1782
1783 nla_for_each_nested(tmp, attr, rem) {
1784 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1785 err = -EINVAL;
1786 goto err_hook;
1787 }
1788
1789 hook = nft_netdev_hook_alloc(net, tmp);
1790 if (IS_ERR(hook)) {
1791 err = PTR_ERR(hook);
1792 goto err_hook;
1793 }
b75a3e83 1794 if (nft_hook_list_find(hook_list, hook)) {
cd77e75b 1795 kfree(hook);
b75a3e83
PNA		 1796 err = -EEXIST;
1797 goto err_hook;
1798 }
3f0465a9
PNA		 1799 list_add_tail(&hook->list, hook_list);
1800 n++;
1801
cb662ac6 1802 if (n == NFT_NETDEVICE_MAX) {
3f0465a9
PNA		 1803 err = -EFBIG;
1804 goto err_hook;
1805 }
1806 }
3f0465a9
PNA		 1807
1808 return 0;
1809
1810err_hook:
1811 list_for_each_entry_safe(hook, next, hook_list, list) {
1812 list_del(&hook->list);
1813 kfree(hook);
1814 }
1815 return err;
1816}
1817
508f8ccd
PNA		 1818struct nft_chain_hook {
1819 u32 num;
84ba7dd7 1820 s32 priority;
32537e91 1821 const struct nft_chain_type *type;
d54725cd 1822 struct list_head list;
508f8ccd
PNA		 1823};
1824
d54725cd
PNA		 1825static int nft_chain_parse_netdev(struct net *net,
1826 struct nlattr *tb[],
1827 struct list_head *hook_list)
1828{
1829 struct nft_hook *hook;
1830 int err;
1831
1832 if (tb[NFTA_HOOK_DEV]) {
1833 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1834 if (IS_ERR(hook))
1835 return PTR_ERR(hook);
1836
1837 list_add_tail(&hook->list, hook_list);
1838 } else if (tb[NFTA_HOOK_DEVS]) {
1839 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1840 hook_list);
1841 if (err < 0)
1842 return err;
05abe445
PNA		 1843
1844 if (list_empty(hook_list))
1845 return -EINVAL;
d54725cd
PNA		 1846 } else {
1847 return -EINVAL;
1848 }
1849
1850 return 0;
1851}
1852
508f8ccd
PNA		 1853static int nft_chain_parse_hook(struct net *net,
1854 const struct nlattr * const nla[],
36596dad 1855 struct nft_chain_hook *hook, u8 family,
445509eb 1856 bool autoload)
508f8ccd
PNA		 1857{
1858 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 1859 const struct nft_chain_type *type;
508f8ccd
PNA		 1860 int err;
1861
f102d66b
FW		 1862 lockdep_assert_held(&net->nft.commit_mutex);
1863 lockdep_nfnl_nft_mutex_not_held();
1864
8cb08174
JB		 1865 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1866 nla[NFTA_CHAIN_HOOK],
1867 nft_hook_policy, NULL);
508f8ccd
PNA		 1868 if (err < 0)
1869 return err;
1870
1871 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1872 ha[NFTA_HOOK_PRIORITY] == NULL)
1873 return -EINVAL;
1874
1875 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 1876 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1877
82603549
PNA		 1878 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1879 if (!type)
1880 return -EOPNOTSUPP;
1881
508f8ccd 1882 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 1883 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 1884 family, autoload);
508f8ccd
PNA		 1885 if (IS_ERR(type))
1886 return PTR_ERR(type);
1887 }
d25e2e93 1888 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
508f8ccd 1889 return -EOPNOTSUPP;
84ba7dd7
FW		 1890
1891 if (type->type == NFT_CHAIN_T_NAT &&
1892 hook->priority <= NF_IP_PRI_CONNTRACK)
1893 return -EOPNOTSUPP;
1894
508f8ccd
PNA		 1895 if (!try_module_get(type->owner))
1896 return -ENOENT;
1897
1898 hook->type = type;
1899
d54725cd 1900 INIT_LIST_HEAD(&hook->list);
d3519cb8 1901 if (nft_base_chain_netdev(family, hook->num)) {
d54725cd
PNA		 1902 err = nft_chain_parse_netdev(net, ha, &hook->list);
1903 if (err < 0) {
508f8ccd 1904 module_put(type->owner);
d54725cd 1905 return err;
508f8ccd 1906 }
d54725cd 1907 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
508f8ccd
PNA		 1908 module_put(type->owner);
1909 return -EOPNOTSUPP;
1910 }
1911
1912 return 0;
1913}
1914
1915static void nft_chain_release_hook(struct nft_chain_hook *hook)
1916{
d54725cd
PNA		 1917 struct nft_hook *h, *next;
1918
1919 list_for_each_entry_safe(h, next, &hook->list, list) {
1920 list_del(&h->list);
1921 kfree(h);
1922 }
508f8ccd 1923 module_put(hook->type->owner);
508f8ccd
PNA		 1924}
1925
0cbc06b3
FW		 1926struct nft_rules_old {
1927 struct rcu_head h;
1928 struct nft_rule **start;
1929};
1930
1931static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1932 unsigned int alloc)
1933{
1934 if (alloc > INT_MAX)
1935 return NULL;
1936
1937 alloc += 1; /* NULL, ends rules */
1938 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1939 return NULL;
1940
1941 alloc *= sizeof(struct nft_rule *);
1942 alloc += sizeof(struct nft_rules_old);
1943
1944 return kvmalloc(alloc, GFP_KERNEL);
1945}
1946
d54725cd
PNA		 1947static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1948 const struct nft_chain_hook *hook,
1949 struct nft_chain *chain)
1950{
1951 ops->pf = family;
1952 ops->hooknum = hook->num;
1953 ops->priority = hook->priority;
1954 ops->priv = chain;
1955 ops->hook = hook->type->hooks[ops->hooknum];
1956}
1957
1958static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1959 struct nft_chain_hook *hook, u32 flags)
1960{
1961 struct nft_chain *chain;
1962 struct nft_hook *h;
1963
1964 basechain->type = hook->type;
1965 INIT_LIST_HEAD(&basechain->hook_list);
1966 chain = &basechain->chain;
1967
d3519cb8 1968 if (nft_base_chain_netdev(family, hook->num)) {
d54725cd
PNA		 1969 list_splice_init(&hook->list, &basechain->hook_list);
1970 list_for_each_entry(h, &basechain->hook_list, list)
1971 nft_basechain_hook_init(&h->ops, family, hook, chain);
1972
1973 basechain->ops.hooknum = hook->num;
1974 basechain->ops.priority = hook->priority;
1975 } else {
1976 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1977 }
1978
67c49de4 1979 chain->flags |= NFT_CHAIN_BASE | flags;
d54725cd
PNA		 1980 basechain->policy = NF_ACCEPT;
1981 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1982 nft_chain_offload_priority(basechain) < 0)
1983 return -EOPNOTSUPP;
1984
1985 flow_block_init(&basechain->flow_block);
1986
1987 return 0;
1988}
1989
04b7db41
PNA		 1990static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1991{
1992 int err;
1993
1994 err = rhltable_insert_key(&table->chains_ht, chain->name,
1995 &chain->rhlhead, nft_chain_ht_params);
1996 if (err)
1997 return err;
1998
1999 list_add_tail_rcu(&chain->list, &table->chains);
2000
2001 return 0;
2002}
2003
d0e2c7de
PNA		 2004static u64 chain_id;
2005
4035285f 2006static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
c9626a2c 2007 u8 policy, u32 flags)
4035285f
PNA		 2008{
2009 const struct nlattr * const *nla = ctx->nla;
2010 struct nft_table *table = ctx->table;
4035285f
PNA		 2011 struct nft_base_chain *basechain;
2012 struct nft_stats __percpu *stats;
2013 struct net *net = ctx->net;
d0e2c7de 2014 char name[NFT_NAME_MAXLEN];
66293c46 2015 struct nft_trans *trans;
4035285f 2016 struct nft_chain *chain;
0cbc06b3 2017 struct nft_rule **rules;
4035285f
PNA		 2018 int err;
2019
2020 if (table->use == UINT_MAX)
2021 return -EOVERFLOW;
2022
2023 if (nla[NFTA_CHAIN_HOOK]) {
2024 struct nft_chain_hook hook;
4035285f 2025
d0e2c7de
PNA		 2026 if (flags & NFT_CHAIN_BINDING)
2027 return -EOPNOTSUPP;
2028
445509eb 2029 err = nft_chain_parse_hook(net, nla, &hook, family, true);
4035285f
PNA		 2030 if (err < 0)
2031 return err;
2032
2033 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2034 if (basechain == NULL) {
2035 nft_chain_release_hook(&hook);
2036 return -ENOMEM;
2037 }
d54725cd 2038 chain = &basechain->chain;
4035285f
PNA		 2039
2040 if (nla[NFTA_CHAIN_COUNTERS]) {
2041 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2042 if (IS_ERR(stats)) {
2043 nft_chain_release_hook(&hook);
2044 kfree(basechain);
2045 return PTR_ERR(stats);
2046 }
4c05ec47 2047 rcu_assign_pointer(basechain->stats, stats);
4035285f
PNA		 2048 static_branch_inc(&nft_counters_enabled);
2049 }
2050
d54725cd
PNA		 2051 err = nft_basechain_init(basechain, family, &hook, flags);
2052 if (err < 0) {
2053 nft_chain_release_hook(&hook);
2054 kfree(basechain);
2055 return err;
2056 }
4035285f 2057 } else {
d0e2c7de
PNA		 2058 if (flags & NFT_CHAIN_BASE)
2059 return -EINVAL;
2060 if (flags & NFT_CHAIN_HW_OFFLOAD)
2061 return -EOPNOTSUPP;
2062
4035285f
PNA		 2063 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2064 if (chain == NULL)
2065 return -ENOMEM;
d0e2c7de
PNA		 2066
2067 chain->flags = flags;
4035285f 2068 }
43a605f2
PNA		 2069 ctx->chain = chain;
2070
4035285f
PNA		 2071 INIT_LIST_HEAD(&chain->rules);
2072 chain->handle = nf_tables_alloc_handle(table);
2073 chain->table = table;
d0e2c7de
PNA		 2074
2075 if (nla[NFTA_CHAIN_NAME]) {
2076 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2077 } else {
59136aa3
FW		 2078 if (!(flags & NFT_CHAIN_BINDING)) {
2079 err = -EINVAL;
002f2176 2080 goto err_destroy_chain;
59136aa3 2081 }
d0e2c7de
PNA		 2082
2083 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2084 chain->name = kstrdup(name, GFP_KERNEL);
2085 }
2086
4035285f
PNA		 2087 if (!chain->name) {
2088 err = -ENOMEM;
002f2176
JGG		 2089 goto err_destroy_chain;
2090 }
2091
2092 if (nla[NFTA_CHAIN_USERDATA]) {
2093 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2094 if (chain->udata == NULL) {
2095 err = -ENOMEM;
2096 goto err_destroy_chain;
2097 }
2098 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
4035285f
PNA		 2099 }
2100
0cbc06b3
FW		 2101 rules = nf_tables_chain_alloc_rules(chain, 0);
2102 if (!rules) {
2103 err = -ENOMEM;
002f2176 2104 goto err_destroy_chain;
0cbc06b3
FW		 2105 }
2106
2107 *rules = NULL;
2108 rcu_assign_pointer(chain->rules_gen_0, rules);
2109 rcu_assign_pointer(chain->rules_gen_1, rules);
2110
c974a3a3 2111 err = nf_tables_register_hook(net, table, chain);
4035285f 2112 if (err < 0)
002f2176 2113 goto err_destroy_chain;
4035285f 2114
66293c46
FW		 2115 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2116 if (IS_ERR(trans)) {
2117 err = PTR_ERR(trans);
002f2176 2118 goto err_unregister_hook;
1b2470e5 2119 }
4035285f 2120
ad652f38 2121 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
66293c46
FW		 2122 if (nft_is_base_chain(chain))
2123 nft_trans_chain_policy(trans) = policy;
2124
04b7db41
PNA		 2125 err = nft_chain_add(table, chain);
2126 if (err < 0) {
2127 nft_trans_destroy(trans);
002f2176 2128 goto err_unregister_hook;
04b7db41
PNA		 2129 }
2130
4035285f 2131 table->use++;
4035285f
PNA		 2132
2133 return 0;
002f2176 2134err_unregister_hook:
c974a3a3 2135 nf_tables_unregister_hook(net, table, chain);
002f2176 2136err_destroy_chain:
43a605f2 2137 nf_tables_chain_destroy(ctx);
4035285f
PNA		 2138
2139 return err;
2140}
2141
d54725cd
PNA		 2142static bool nft_hook_list_equal(struct list_head *hook_list1,
2143 struct list_head *hook_list2)
2144{
2145 struct nft_hook *hook;
2146 int n = 0, m = 0;
2147
2148 n = 0;
2149 list_for_each_entry(hook, hook_list2, list) {
2150 if (!nft_hook_list_find(hook_list1, hook))
2151 return false;
2152
2153 n++;
2154 }
2155 list_for_each_entry(hook, hook_list1, list)
2156 m++;
2157
2158 return n == m;
2159}
2160
c9626a2c 2161static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
98a381a7
PNA		 2162 u32 flags, const struct nlattr *attr,
2163 struct netlink_ext_ack *extack)
2c4a488a
PNA		 2164{
2165 const struct nlattr * const *nla = ctx->nla;
2166 struct nft_table *table = ctx->table;
2167 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 2168 struct nft_base_chain *basechain;
2169 struct nft_stats *stats = NULL;
2170 struct nft_chain_hook hook;
2c4a488a
PNA		 2171 struct nf_hook_ops *ops;
2172 struct nft_trans *trans;
c974a3a3 2173 int err;
2c4a488a 2174
c9626a2c
PNA		 2175 if (chain->flags ^ flags)
2176 return -EOPNOTSUPP;
2177
2c4a488a 2178 if (nla[NFTA_CHAIN_HOOK]) {
98a381a7
PNA		 2179 if (!nft_is_base_chain(chain)) {
2180 NL_SET_BAD_ATTR(extack, attr);
77a92189 2181 return -EEXIST;
98a381a7 2182 }
36596dad 2183 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
445509eb 2184 false);
2c4a488a
PNA		 2185 if (err < 0)
2186 return err;
2187
2188 basechain = nft_base_chain(chain);
2189 if (basechain->type != hook.type) {
2190 nft_chain_release_hook(&hook);
98a381a7 2191 NL_SET_BAD_ATTR(extack, attr);
77a92189 2192 return -EEXIST;
2c4a488a
PNA		 2193 }
2194
d3519cb8 2195 if (nft_base_chain_netdev(ctx->family, hook.num)) {
d54725cd
PNA		 2196 if (!nft_hook_list_equal(&basechain->hook_list,
2197 &hook.list)) {
2198 nft_chain_release_hook(&hook);
98a381a7 2199 NL_SET_BAD_ATTR(extack, attr);
77a92189 2200 return -EEXIST;
d54725cd
PNA		 2201 }
2202 } else {
2203 ops = &basechain->ops;
2204 if (ops->hooknum != hook.num ||
2205 ops->priority != hook.priority) {
2206 nft_chain_release_hook(&hook);
98a381a7 2207 NL_SET_BAD_ATTR(extack, attr);
77a92189 2208 return -EEXIST;
d54725cd 2209 }
2c4a488a
PNA		 2210 }
2211 nft_chain_release_hook(&hook);
2212 }
2213
2214 if (nla[NFTA_CHAIN_HANDLE] &&
2215 nla[NFTA_CHAIN_NAME]) {
2216 struct nft_chain *chain2;
2217
f102d66b
FW		 2218 chain2 = nft_chain_lookup(ctx->net, table,
2219 nla[NFTA_CHAIN_NAME], genmask);
98a381a7
PNA		 2220 if (!IS_ERR(chain2)) {
2221 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
0d18779b 2222 return -EEXIST;
98a381a7 2223 }
2c4a488a
PNA		 2224 }
2225
2226 if (nla[NFTA_CHAIN_COUNTERS]) {
2227 if (!nft_is_base_chain(chain))
2228 return -EOPNOTSUPP;
2229
2230 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2231 if (IS_ERR(stats))
2232 return PTR_ERR(stats);
2233 }
2234
c6cc94df 2235 err = -ENOMEM;
2c4a488a
PNA		 2236 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2237 sizeof(struct nft_trans_chain));
c6cc94df
FW		 2238 if (trans == NULL)
2239 goto err;
2c4a488a
PNA		 2240
2241 nft_trans_chain_stats(trans) = stats;
2242 nft_trans_chain_update(trans) = true;
2243
2244 if (nla[NFTA_CHAIN_POLICY])
2245 nft_trans_chain_policy(trans) = policy;
2246 else
2247 nft_trans_chain_policy(trans) = -1;
2248
c6cc94df
FW		 2249 if (nla[NFTA_CHAIN_HANDLE] &&
2250 nla[NFTA_CHAIN_NAME]) {
2251 struct nft_trans *tmp;
2252 char *name;
2253
2254 err = -ENOMEM;
2255 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2256 if (!name)
2257 goto err;
2258
2259 err = -EEXIST;
2260 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2261 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2262 tmp->ctx.table == table &&
2263 nft_trans_chain_update(tmp) &&
2264 nft_trans_chain_name(tmp) &&
2265 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
98a381a7 2266 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
c6cc94df
FW		 2267 kfree(name);
2268 goto err;
2269 }
2c4a488a 2270 }
c6cc94df
FW		 2271
2272 nft_trans_chain_name(trans) = name;
2c4a488a
PNA		 2273 }
2274 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2275
2276 return 0;
c6cc94df
FW		 2277err:
2278 free_percpu(stats);
2279 kfree(trans);
2280 return err;
2c4a488a
PNA		 2281}
2282
837830a4
PNA		 2283static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2284 const struct nlattr *nla)
2285{
2286 u32 id = ntohl(nla_get_be32(nla));
2287 struct nft_trans *trans;
2288
2289 list_for_each_entry(trans, &net->nft.commit_list, list) {
2290 struct nft_chain *chain = trans->ctx.chain;
2291
2292 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2293 id == nft_trans_chain_id(trans))
2294 return chain;
2295 }
2296 return ERR_PTR(-ENOENT);
2297}
2298
633c9a84
PNA		 2299static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2300 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2301 const struct nlattr * const nla[],
2302 struct netlink_ext_ack *extack)
96518518
PM		 2303{
2304 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4035285f
PNA		 2305 u8 genmask = nft_genmask_next(net);
2306 int family = nfmsg->nfgen_family;
74cccc3d 2307 struct nft_chain *chain = NULL;
36dd1bcc 2308 const struct nlattr *attr;
96518518 2309 struct nft_table *table;
57de2a0c 2310 u8 policy = NF_ACCEPT;
4035285f 2311 struct nft_ctx ctx;
96518518 2312 u64 handle = 0;
c9626a2c 2313 u32 flags = 0;
96518518 2314
f102d66b
FW		 2315 lockdep_assert_held(&net->nft.commit_mutex);
2316
6001a930
PNA		 2317 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2318 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 2319 if (IS_ERR(table)) {
2320 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2321 return PTR_ERR(table);
36dd1bcc 2322 }
96518518 2323
96518518 2324 chain = NULL;
36dd1bcc 2325 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 2326
2327 if (nla[NFTA_CHAIN_HANDLE]) {
2328 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 2329 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 2330 if (IS_ERR(chain)) {
2331 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 2332 return PTR_ERR(chain);
36dd1bcc
PNA		 2333 }
2334 attr = nla[NFTA_CHAIN_HANDLE];
74cccc3d 2335 } else if (nla[NFTA_CHAIN_NAME]) {
f102d66b 2336 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 2337 if (IS_ERR(chain)) {
36dd1bcc
PNA		 2338 if (PTR_ERR(chain) != -ENOENT) {
2339 NL_SET_BAD_ATTR(extack, attr);
96518518 2340 return PTR_ERR(chain);
36dd1bcc 2341 }
96518518
PM		 2342 chain = NULL;
2343 }
74cccc3d
PNA		 2344 } else if (!nla[NFTA_CHAIN_ID]) {
2345 return -EINVAL;
96518518
PM		 2346 }
2347
57de2a0c 2348 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 2349 if (chain != NULL &&
36dd1bcc
PNA		 2350 !nft_is_base_chain(chain)) {
2351 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 2352 return -EOPNOTSUPP;
36dd1bcc 2353 }
d6b6cb1d
PNA		 2354
2355 if (chain == NULL &&
36dd1bcc
PNA		 2356 nla[NFTA_CHAIN_HOOK] == NULL) {
2357 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 2358 return -EOPNOTSUPP;
36dd1bcc 2359 }
57de2a0c 2360
8f46df18 2361 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 2362 switch (policy) {
2363 case NF_DROP:
2364 case NF_ACCEPT:
2365 break;
2366 default:
2367 return -EINVAL;
2368 }
2369 }
2370
c9626a2c
PNA		 2371 if (nla[NFTA_CHAIN_FLAGS])
2372 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
b717273d
FW		 2373 else if (chain)
2374 flags = chain->flags;
c9626a2c 2375
c1f79a2e
PNA		 2376 if (flags & ~NFT_CHAIN_FLAGS)
2377 return -EOPNOTSUPP;
2378
98319cb9 2379 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
4035285f 2380
96518518 2381 if (chain != NULL) {
36dd1bcc
PNA		 2382 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2383 NL_SET_BAD_ATTR(extack, attr);
96518518 2384 return -EEXIST;
36dd1bcc 2385 }
96518518
PM		 2386 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2387 return -EOPNOTSUPP;
2388
67c49de4 2389 flags |= chain->flags & NFT_CHAIN_BASE;
98a381a7
PNA		 2390 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2391 extack);
96518518
PM		 2392 }
2393
c9626a2c 2394 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
96518518
PM		 2395}
2396
633c9a84
PNA		 2397static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2398 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2399 const struct nlattr * const nla[],
2400 struct netlink_ext_ack *extack)
96518518
PM		 2401{
2402 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2403 u8 genmask = nft_genmask_next(net);
36dd1bcc
PNA		 2404 int family = nfmsg->nfgen_family;
2405 const struct nlattr *attr;
96518518
PM		 2406 struct nft_table *table;
2407 struct nft_chain *chain;
9dee1474 2408 struct nft_rule *rule;
91c7b38d 2409 struct nft_ctx ctx;
3ecbfd65 2410 u64 handle;
9dee1474
PNA		 2411 u32 use;
2412 int err;
96518518 2413
6001a930
PNA		 2414 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2415 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 2416 if (IS_ERR(table)) {
2417 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2418 return PTR_ERR(table);
36dd1bcc 2419 }
96518518 2420
3ecbfd65 2421 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 2422 attr = nla[NFTA_CHAIN_HANDLE];
2423 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 2424 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 2425 } else {
36dd1bcc 2426 attr = nla[NFTA_CHAIN_NAME];
f102d66b 2427 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 2428 }
36dd1bcc
PNA		 2429 if (IS_ERR(chain)) {
2430 NL_SET_BAD_ATTR(extack, attr);
96518518 2431 return PTR_ERR(chain);
36dd1bcc 2432 }
9dee1474
PNA		 2433
2434 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2435 chain->use > 0)
96518518
PM		 2436 return -EBUSY;
2437
98319cb9 2438 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0165d932 2439
9dee1474
PNA		 2440 use = chain->use;
2441 list_for_each_entry(rule, &chain->rules, list) {
2442 if (!nft_is_active_next(net, rule))
2443 continue;
2444 use--;
2445
2446 err = nft_delrule(&ctx, rule);
2447 if (err < 0)
2448 return err;
2449 }
2450
2451 /* There are rules and elements that are still holding references to us,
2452 * we cannot do a recursive removal in this case.
2453 */
36dd1bcc
PNA		 2454 if (use > 0) {
2455 NL_SET_BAD_ATTR(extack, attr);
9dee1474 2456 return -EBUSY;
36dd1bcc 2457 }
9dee1474 2458
ee01d542 2459 return nft_delchain(&ctx);
96518518
PM		 2460}
2461
96518518
PM		 2462/*
2463 * Expressions
2464 */
2465
2466/**
ef1f7df9 2467 * nft_register_expr - register nf_tables expr type
3db86c39 2468 * @type: expr type
96518518 2469 *
ef1f7df9 2470 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 2471 * success or a negative errno code otherwise.
2472 */
ef1f7df9 2473int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 2474{
2475 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 2476 if (type->family == NFPROTO_UNSPEC)
e688a7f8 2477 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 2478 else
e688a7f8 2479 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 2480 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2481 return 0;
2482}
2483EXPORT_SYMBOL_GPL(nft_register_expr);
2484
2485/**
ef1f7df9 2486 * nft_unregister_expr - unregister nf_tables expr type
3db86c39 2487 * @type: expr type
96518518 2488 *
ef1f7df9 2489 * Unregisters the expr typefor use with nf_tables.
96518518 2490 */
ef1f7df9 2491void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 2492{
2493 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2494 list_del_rcu(&type->list);
96518518
PM		 2495 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2496}
2497EXPORT_SYMBOL_GPL(nft_unregister_expr);
2498
64d46806
PM		 2499static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2500 struct nlattr *nla)
96518518 2501{
9cff126f 2502 const struct nft_expr_type *type, *candidate = NULL;
96518518 2503
ef1f7df9 2504 list_for_each_entry(type, &nf_tables_expressions, list) {
9cff126f
PNA		 2505 if (!nla_strcmp(nla, type->name)) {
2506 if (!type->family && !candidate)
2507 candidate = type;
2508 else if (type->family == family)
2509 candidate = type;
2510 }
96518518 2511 }
9cff126f 2512 return candidate;
96518518
PM		 2513}
2514
b9c04ae7
PNA		 2515#ifdef CONFIG_MODULES
2516static int nft_expr_type_request_module(struct net *net, u8 family,
2517 struct nlattr *nla)
2518{
eb014de4
PNA		 2519 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2520 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
b9c04ae7
PNA		 2521 return -EAGAIN;
2522
2523 return 0;
2524}
2525#endif
2526
452238e8
FW		 2527static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2528 u8 family,
64d46806 2529 struct nlattr *nla)
96518518 2530{
ef1f7df9 2531 const struct nft_expr_type *type;
96518518
PM		 2532
2533 if (nla == NULL)
2534 return ERR_PTR(-EINVAL);
2535
64d46806 2536 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 2537 if (type != NULL && try_module_get(type->owner))
2538 return type;
96518518 2539
f102d66b 2540 lockdep_nfnl_nft_mutex_not_held();
96518518 2541#ifdef CONFIG_MODULES
ef1f7df9 2542 if (type == NULL) {
b9c04ae7 2543 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
64d46806
PM		 2544 return ERR_PTR(-EAGAIN);
2545
eb014de4
PNA		 2546 if (nft_request_module(net, "nft-expr-%.*s",
2547 nla_len(nla),
2548 (char *)nla_data(nla)) == -EAGAIN)
96518518
PM		 2549 return ERR_PTR(-EAGAIN);
2550 }
2551#endif
2552 return ERR_PTR(-ENOENT);
2553}
2554
2555static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
9332d27d
FW		 2556 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2557 .len = NFT_MODULE_AUTOLOAD_LIMIT },
96518518
PM		 2558 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2559};
2560
2561static int nf_tables_fill_expr_info(struct sk_buff *skb,
2562 const struct nft_expr *expr)
2563{
ef1f7df9 2564 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 2565 goto nla_put_failure;
2566
2567 if (expr->ops->dump) {
ae0be8de
MK		 2568 struct nlattr *data = nla_nest_start_noflag(skb,
2569 NFTA_EXPR_DATA);
96518518
PM		 2570 if (data == NULL)
2571 goto nla_put_failure;
2572 if (expr->ops->dump(skb, expr) < 0)
2573 goto nla_put_failure;
2574 nla_nest_end(skb, data);
2575 }
2576
2577 return skb->len;
2578
2579nla_put_failure:
2580 return -1;
2581};
2582
0b2d8a7b
PM		 2583int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2584 const struct nft_expr *expr)
2585{
2586 struct nlattr *nest;
2587
ae0be8de 2588 nest = nla_nest_start_noflag(skb, attr);
0b2d8a7b
PM		 2589 if (!nest)
2590 goto nla_put_failure;
2591 if (nf_tables_fill_expr_info(skb, expr) < 0)
2592 goto nla_put_failure;
2593 nla_nest_end(skb, nest);
2594 return 0;
2595
2596nla_put_failure:
2597 return -1;
2598}
2599
96518518
PM		 2600struct nft_expr_info {
2601 const struct nft_expr_ops *ops;
83d9dcba 2602 const struct nlattr *attr;
ef1f7df9 2603 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2604};
2605
0ca743a5
PNA		 2606static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2607 const struct nlattr *nla,
96518518
PM		 2608 struct nft_expr_info *info)
2609{
ef1f7df9 2610 const struct nft_expr_type *type;
96518518 2611 const struct nft_expr_ops *ops;
ef1f7df9 2612 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2613 int err;
2614
8cb08174
JB		 2615 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2616 nft_expr_policy, NULL);
96518518
PM		 2617 if (err < 0)
2618 return err;
2619
452238e8 2620 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2621 if (IS_ERR(type))
2622 return PTR_ERR(type);
2623
2624 if (tb[NFTA_EXPR_DATA]) {
8cb08174
JB		 2625 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2626 tb[NFTA_EXPR_DATA],
2627 type->policy, NULL);
ef1f7df9
PM		 2628 if (err < 0)
2629 goto err1;
2630 } else
2631 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2632
2633 if (type->select_ops != NULL) {
0ca743a5
PNA		 2634 ops = type->select_ops(ctx,
2635 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2636 if (IS_ERR(ops)) {
2637 err = PTR_ERR(ops);
0ef1efd1
PNA		 2638#ifdef CONFIG_MODULES
2639 if (err == -EAGAIN)
eb014de4
PNA		 2640 if (nft_expr_type_request_module(ctx->net,
2641 ctx->family,
2642 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2643 err = -ENOENT;
0ef1efd1 2644#endif
ef1f7df9
PM		 2645 goto err1;
2646 }
2647 } else
2648 ops = type->ops;
2649
83d9dcba 2650 info->attr = nla;
96518518 2651 info->ops = ops;
83d9dcba 2652
96518518 2653 return 0;
ef1f7df9
PM		 2654
2655err1:
2656 module_put(type->owner);
2657 return err;
96518518
PM		 2658}
2659
2660static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 2661 const struct nft_expr_info *info,
96518518
PM		 2662 struct nft_expr *expr)
2663{
2664 const struct nft_expr_ops *ops = info->ops;
2665 int err;
2666
2667 expr->ops = ops;
2668 if (ops->init) {
ef1f7df9 2669 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 2670 if (err < 0)
2671 goto err1;
2672 }
2673
96518518 2674 return 0;
96518518
PM		 2675err1:
2676 expr->ops = NULL;
2677 return err;
2678}
2679
62472bce
PM		 2680static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2681 struct nft_expr *expr)
96518518 2682{
3f3a390d
PNA		 2683 const struct nft_expr_type *type = expr->ops->type;
2684
96518518 2685 if (expr->ops->destroy)
62472bce 2686 expr->ops->destroy(ctx, expr);
3f3a390d 2687 module_put(type->owner);
96518518
PM		 2688}
2689
795a6d6b
PNA		 2690static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2691 const struct nlattr *nla)
0b2d8a7b
PM		 2692{
2693 struct nft_expr_info info;
2694 struct nft_expr *expr;
b8e20400 2695 struct module *owner;
0b2d8a7b
PM		 2696 int err;
2697
2698 err = nf_tables_expr_parse(ctx, nla, &info);
2699 if (err < 0)
2700 goto err1;
2701
2702 err = -ENOMEM;
2703 expr = kzalloc(info.ops->size, GFP_KERNEL);
2704 if (expr == NULL)
2705 goto err2;
2706
2707 err = nf_tables_newexpr(ctx, &info, expr);
2708 if (err < 0)
6cafaf47 2709 goto err3;
0b2d8a7b
PM		 2710
2711 return expr;
6cafaf47
LZ		 2712err3:
2713 kfree(expr);
0b2d8a7b 2714err2:
b8e20400
PNA		 2715 owner = info.ops->type->owner;
2716 if (info.ops->type->release_ops)
2717 info.ops->type->release_ops(info.ops);
2718
2719 module_put(owner);
0b2d8a7b
PM		 2720err1:
2721 return ERR_PTR(err);
2722}
2723
c604cc69
PNA		 2724int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2725{
2726 int err;
2727
2728 if (src->ops->clone) {
2729 dst->ops = src->ops;
2730 err = src->ops->clone(dst, src);
2731 if (err < 0)
2732 return err;
2733 } else {
2734 memcpy(dst, src, src->ops->size);
2735 }
2736
2737 __module_get(src->ops->type->owner);
2738
2739 return 0;
2740}
2741
0b2d8a7b
PM		 2742void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2743{
2744 nf_tables_expr_destroy(ctx, expr);
2745 kfree(expr);
2746}
2747
96518518
PM		 2748/*
2749 * Rules
2750 */
2751
cac20fcd
PNA		 2752static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2753 u64 handle)
96518518
PM		 2754{
2755 struct nft_rule *rule;
2756
2757 // FIXME: this sucks
d9adf22a 2758 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 2759 if (handle == rule->handle)
2760 return rule;
2761 }
2762
2763 return ERR_PTR(-ENOENT);
2764}
2765
cac20fcd
PNA		 2766static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2767 const struct nlattr *nla)
96518518
PM		 2768{
2769 if (nla == NULL)
2770 return ERR_PTR(-EINVAL);
2771
cac20fcd 2772 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 2773}
2774
2775static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 2776 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2777 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 2778 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2779 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2780 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2781 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 2782 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 2783 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 2784 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2785 .len = NFT_USERDATA_MAXLEN },
467697d2 2786 [NFTA_RULE_ID] = { .type = NLA_U32 },
0604628b 2787 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
837830a4 2788 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 2789};
2790
84d7fce6
PNA		 2791static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2792 u32 portid, u32 seq, int event,
2793 u32 flags, int family,
96518518
PM		 2794 const struct nft_table *table,
2795 const struct nft_chain *chain,
2c82c7e7
FW		 2796 const struct nft_rule *rule,
2797 const struct nft_rule *prule)
96518518
PM		 2798{
2799 struct nlmsghdr *nlh;
2800 struct nfgenmsg *nfmsg;
2801 const struct nft_expr *expr, *next;
2802 struct nlattr *list;
dedb67c4 2803 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 2804
dedb67c4 2805 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 2806 if (nlh == NULL)
2807 goto nla_put_failure;
2808
2809 nfmsg = nlmsg_data(nlh);
2810 nfmsg->nfgen_family = family;
2811 nfmsg->version = NFNETLINK_V0;
84d7fce6 2812 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 2813
2814 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2815 goto nla_put_failure;
2816 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2817 goto nla_put_failure;
b46f6ded
ND		 2818 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2819 NFTA_RULE_PAD))
96518518
PM		 2820 goto nla_put_failure;
2821
2c82c7e7 2822 if (event != NFT_MSG_DELRULE && prule) {
5e948466 2823 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 2824 cpu_to_be64(prule->handle),
2825 NFTA_RULE_PAD))
5e948466
EL		 2826 goto nla_put_failure;
2827 }
2828
ae0be8de 2829 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
96518518
PM		 2830 if (list == NULL)
2831 goto nla_put_failure;
2832 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 2833 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 2834 goto nla_put_failure;
96518518
PM		 2835 }
2836 nla_nest_end(skb, list);
2837
86f1ec32
PM		 2838 if (rule->udata) {
2839 struct nft_userdata *udata = nft_userdata(rule);
2840 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2841 udata->data) < 0)
2842 goto nla_put_failure;
2843 }
0768b3b3 2844
053c095a
JB		 2845 nlmsg_end(skb, nlh);
2846 return 0;
96518518
PM		 2847
2848nla_put_failure:
2849 nlmsg_trim(skb, nlh);
2850 return -1;
2851}
2852
25e94a99
PNA		 2853static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2854 const struct nft_rule *rule, int event)
96518518
PM		 2855{
2856 struct sk_buff *skb;
96518518 2857 int err;
8e6cf365
RGB		 2858 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2859 ctx->table->name, ctx->table->handle,
2860 ctx->chain->name, ctx->chain->handle);
2861
2862 audit_log_nfcfg(buf,
2863 ctx->family,
2864 rule->handle,
2865 event == NFT_MSG_NEWRULE ?
2866 AUDIT_NFT_OP_RULE_REGISTER :
14224039
RGB		 2867 AUDIT_NFT_OP_RULE_UNREGISTER,
2868 GFP_KERNEL);
8e6cf365 2869 kfree(buf);
96518518 2870
128ad332
PNA		 2871 if (!ctx->report &&
2872 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2873 return;
96518518 2874
96518518
PM		 2875 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2876 if (skb == NULL)
2877 goto err;
2878
84d7fce6 2879 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 2880 event, 0, ctx->family, ctx->table,
2c82c7e7 2881 ctx->chain, rule, NULL);
96518518
PM		 2882 if (err < 0) {
2883 kfree_skb(skb);
2884 goto err;
2885 }
2886
67cc570e 2887 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
25e94a99 2888 return;
96518518 2889err:
25e94a99 2890 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2891}
2892
6e1f760e 2893struct nft_rule_dump_ctx {
e46abbcc 2894 char *table;
b7263e07 2895 char *chain;
6e1f760e
PNA		 2896};
2897
241faece
PS		 2898static int __nf_tables_dump_rules(struct sk_buff *skb,
2899 unsigned int *idx,
2900 struct netlink_callback *cb,
2901 const struct nft_table *table,
2902 const struct nft_chain *chain)
2903{
2904 struct net *net = sock_net(skb->sk);
2c82c7e7 2905 const struct nft_rule *rule, *prule;
241faece 2906 unsigned int s_idx = cb->args[0];
241faece 2907
2c82c7e7 2908 prule = NULL;
241faece
PS		 2909 list_for_each_entry_rcu(rule, &chain->rules, list) {
2910 if (!nft_is_active(net, rule))
2c82c7e7 2911 goto cont_skip;
241faece
PS		 2912 if (*idx < s_idx)
2913 goto cont;
2914 if (*idx > s_idx) {
2915 memset(&cb->args[1], 0,
2916 sizeof(cb->args) - sizeof(cb->args[0]));
2917 }
2918 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2919 cb->nlh->nlmsg_seq,
2920 NFT_MSG_NEWRULE,
2921 NLM_F_MULTI | NLM_F_APPEND,
2922 table->family,
2c82c7e7 2923 table, chain, rule, prule) < 0)
310529e6 2924 return 1;
241faece
PS		 2925
2926 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2927cont:
2c82c7e7
FW		 2928 prule = rule;
2929cont_skip:
241faece
PS		 2930 (*idx)++;
2931 }
310529e6 2932 return 0;
241faece
PS		 2933}
2934
96518518
PM		 2935static int nf_tables_dump_rules(struct sk_buff *skb,
2936 struct netlink_callback *cb)
2937{
2938 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2939 const struct nft_rule_dump_ctx *ctx = cb->data;
241faece 2940 struct nft_table *table;
96518518 2941 const struct nft_chain *chain;
241faece 2942 unsigned int idx = 0;
99633ab2 2943 struct net *net = sock_net(skb->sk);
96518518
PM		 2944 int family = nfmsg->nfgen_family;
2945
e688a7f8 2946 rcu_read_lock();
38e029f1
PNA		 2947 cb->seq = net->nft.base_seq;
2948
36596dad 2949 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 2950 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 2951 continue;
2952
2953 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 2954 continue;
2955
715849ab 2956 if (ctx && ctx->table && ctx->chain) {
241faece 2957 struct rhlist_head *list, *tmp;
6e1f760e 2958
241faece
PS		 2959 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2960 nft_chain_ht_params);
2961 if (!list)
2962 goto done;
2963
2964 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2965 if (!nft_is_active(net, chain))
2966 continue;
2967 __nf_tables_dump_rules(skb, &idx,
2968 cb, table, chain);
2969 break;
96518518 2970 }
241faece 2971 goto done;
96518518 2972 }
241faece
PS		 2973
2974 list_for_each_entry_rcu(chain, &table->chains, list) {
2975 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2976 goto done;
2977 }
2978
2979 if (ctx && ctx->table)
2980 break;
96518518
PM		 2981 }
2982done:
e688a7f8 2983 rcu_read_unlock();
310529e6
PS		 2984
2985 cb->args[0] = idx;
96518518
PM		 2986 return skb->len;
2987}
2988
90fd131a
FW		 2989static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2990{
2991 const struct nlattr * const *nla = cb->data;
2992 struct nft_rule_dump_ctx *ctx = NULL;
2993
2994 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2995 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2996 if (!ctx)
2997 return -ENOMEM;
2998
2999 if (nla[NFTA_RULE_TABLE]) {
3000 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3001 GFP_ATOMIC);
3002 if (!ctx->table) {
3003 kfree(ctx);
3004 return -ENOMEM;
3005 }
3006 }
3007 if (nla[NFTA_RULE_CHAIN]) {
3008 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3009 GFP_ATOMIC);
3010 if (!ctx->chain) {
3011 kfree(ctx->table);
3012 kfree(ctx);
3013 return -ENOMEM;
3014 }
3015 }
3016 }
3017
3018 cb->data = ctx;
3019 return 0;
3020}
3021
6e1f760e
PNA		 3022static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3023{
e46abbcc
PS		 3024 struct nft_rule_dump_ctx *ctx = cb->data;
3025
3026 if (ctx) {
3027 kfree(ctx->table);
b7263e07 3028 kfree(ctx->chain);
e46abbcc
PS		 3029 kfree(ctx);
3030 }
6e1f760e
PNA		 3031 return 0;
3032}
3033
d9adf22a 3034/* called with rcu_read_lock held */
7b8002a1
PNA		 3035static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3036 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3037 const struct nlattr * const nla[],
3038 struct netlink_ext_ack *extack)
96518518
PM		 3039{
3040 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3041 u8 genmask = nft_genmask_cur(net);
96518518
PM		 3042 const struct nft_chain *chain;
3043 const struct nft_rule *rule;
1b2470e5 3044 struct nft_table *table;
96518518
PM		 3045 struct sk_buff *skb2;
3046 int family = nfmsg->nfgen_family;
3047 int err;
3048
3049 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3050 struct netlink_dump_control c = {
90fd131a 3051 .start= nf_tables_dump_rules_start,
96518518 3052 .dump = nf_tables_dump_rules,
6e1f760e 3053 .done = nf_tables_dump_rules_done,
d9adf22a 3054 .module = THIS_MODULE,
90fd131a 3055 .data = (void *)nla,
96518518 3056 };
6e1f760e 3057
d9adf22a 3058 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 3059 }
3060
6001a930 3061 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
36dd1bcc
PNA		 3062 if (IS_ERR(table)) {
3063 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3064 return PTR_ERR(table);
36dd1bcc 3065 }
96518518 3066
f102d66b 3067 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 3068 if (IS_ERR(chain)) {
3069 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 3070 return PTR_ERR(chain);
36dd1bcc 3071 }
96518518 3072
cac20fcd 3073 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3074 if (IS_ERR(rule)) {
3075 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3076 return PTR_ERR(rule);
36dd1bcc 3077 }
96518518 3078
d9adf22a 3079 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 3080 if (!skb2)
3081 return -ENOMEM;
3082
84d7fce6 3083 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518 3084 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2c82c7e7 3085 family, table, chain, rule, NULL);
96518518 3086 if (err < 0)
ee921183 3087 goto err_fill_rule_info;
96518518 3088
ee921183 3089 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
96518518 3090
ee921183 3091err_fill_rule_info:
96518518
PM		 3092 kfree_skb(skb2);
3093 return err;
3094}
3095
62472bce
PM		 3096static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3097 struct nft_rule *rule)
96518518 3098{
29e38801 3099 struct nft_expr *expr, *next;
96518518
PM		 3100
3101 /*
3102 * Careful: some expressions might not be initialized in case this
3103 * is called on error from nf_tables_newrule().
3104 */
3105 expr = nft_expr_first(rule);
31cc578a 3106 while (nft_expr_more(rule, expr)) {
29e38801 3107 next = nft_expr_next(expr);
62472bce 3108 nf_tables_expr_destroy(ctx, expr);
29e38801 3109 expr = next;
96518518
PM		 3110 }
3111 kfree(rule);
3112}
3113
d0e2c7de 3114void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
bb7b40ae 3115{
f6ac8585 3116 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
bb7b40ae
PNA		 3117 nf_tables_rule_destroy(ctx, rule);
3118}
3119
a654de8f
PNA		 3120int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3121{
3122 struct nft_expr *expr, *last;
3123 const struct nft_data *data;
3124 struct nft_rule *rule;
3125 int err;
3126
26b2f552
TY		 3127 if (ctx->level == NFT_JUMP_STACK_SIZE)
3128 return -EMLINK;
3129
a654de8f
PNA		 3130 list_for_each_entry(rule, &chain->rules, list) {
3131 if (!nft_is_active_next(ctx->net, rule))
3132 continue;
3133
3134 nft_rule_for_each_expr(expr, last, rule) {
3135 if (!expr->ops->validate)
3136 continue;
3137
3138 err = expr->ops->validate(ctx, expr, &data);
3139 if (err < 0)
3140 return err;
3141 }
3142 }
3143
3144 return 0;
3145}
3146EXPORT_SYMBOL_GPL(nft_chain_validate);
3147
3148static int nft_table_validate(struct net *net, const struct nft_table *table)
3149{
3150 struct nft_chain *chain;
3151 struct nft_ctx ctx = {
3152 .net = net,
3153 .family = table->family,
3154 };
3155 int err;
3156
3157 list_for_each_entry(chain, &table->chains, list) {
3158 if (!nft_is_base_chain(chain))
3159 continue;
3160
3161 ctx.chain = chain;
3162 err = nft_chain_validate(&ctx, chain);
3163 if (err < 0)
3164 return err;
3165 }
3166
3167 return 0;
3168}
3169
75dd48e2
PS		 3170static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3171 const struct nlattr *nla);
3172
1081d11b
PNA		 3173#define NFT_RULE_MAXEXPRS 128
3174
633c9a84
PNA		 3175static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3176 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3177 const struct nlattr * const nla[],
3178 struct netlink_ext_ack *extack)
96518518
PM		 3179{
3180 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3181 u8 genmask = nft_genmask_next(net);
2a43ecf9 3182 struct nft_expr_info *info = NULL;
98319cb9 3183 int family = nfmsg->nfgen_family;
c9626a2c 3184 struct nft_flow_rule *flow;
96518518
PM		 3185 struct nft_table *table;
3186 struct nft_chain *chain;
3187 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 3188 struct nft_userdata *udata;
1081d11b 3189 struct nft_trans *trans = NULL;
96518518
PM		 3190 struct nft_expr *expr;
3191 struct nft_ctx ctx;
3192 struct nlattr *tmp;
86f1ec32 3193 unsigned int size, i, n, ulen = 0, usize = 0;
96518518 3194 int err, rem;
5e948466 3195 u64 handle, pos_handle;
96518518 3196
f102d66b
FW		 3197 lockdep_assert_held(&net->nft.commit_mutex);
3198
6001a930
PNA		 3199 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3200 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 3201 if (IS_ERR(table)) {
3202 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3203 return PTR_ERR(table);
36dd1bcc 3204 }
96518518 3205
837830a4
PNA		 3206 if (nla[NFTA_RULE_CHAIN]) {
3207 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3208 genmask);
3209 if (IS_ERR(chain)) {
3210 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3211 return PTR_ERR(chain);
3212 }
d0e2c7de
PNA		 3213 if (nft_chain_is_bound(chain))
3214 return -EOPNOTSUPP;
3215
837830a4
PNA		 3216 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3217 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3218 if (IS_ERR(chain)) {
3219 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3220 return PTR_ERR(chain);
3221 }
3222 } else {
3223 return -EINVAL;
36dd1bcc 3224 }
96518518
PM		 3225
3226 if (nla[NFTA_RULE_HANDLE]) {
3227 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 3228 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 3229 if (IS_ERR(rule)) {
3230 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3231 return PTR_ERR(rule);
36dd1bcc 3232 }
96518518 3233
36dd1bcc
PNA		 3234 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3235 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3236 return -EEXIST;
36dd1bcc 3237 }
96518518
PM		 3238 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3239 old_rule = rule;
3240 else
3241 return -EOPNOTSUPP;
3242 } else {
445509eb
PNA		 3243 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3244 nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3245 return -EINVAL;
3246 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 3247
3248 if (chain->use == UINT_MAX)
3249 return -EOVERFLOW;
5e948466 3250
447750f2
FW		 3251 if (nla[NFTA_RULE_POSITION]) {
3252 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3253 old_rule = __nft_rule_lookup(chain, pos_handle);
3254 if (IS_ERR(old_rule)) {
3255 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3256 return PTR_ERR(old_rule);
3257 }
75dd48e2
PS		 3258 } else if (nla[NFTA_RULE_POSITION_ID]) {
3259 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3260 if (IS_ERR(old_rule)) {
3261 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3262 return PTR_ERR(old_rule);
3263 }
36dd1bcc 3264 }
5e948466
EL		 3265 }
3266
98319cb9 3267 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0ca743a5 3268
96518518
PM		 3269 n = 0;
3270 size = 0;
3271 if (nla[NFTA_RULE_EXPRESSIONS]) {
2a43ecf9
FW		 3272 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3273 sizeof(struct nft_expr_info),
3274 GFP_KERNEL);
3275 if (!info)
3276 return -ENOMEM;
3277
96518518
PM		 3278 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3279 err = -EINVAL;
3280 if (nla_type(tmp) != NFTA_LIST_ELEM)
3281 goto err1;
3282 if (n == NFT_RULE_MAXEXPRS)
3283 goto err1;
0ca743a5 3284 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 3285 if (err < 0)
3286 goto err1;
3287 size += info[n].ops->size;
3288 n++;
3289 }
3290 }
9889840f
PM		 3291 /* Check for overflow of dlen field */
3292 err = -EFBIG;
3293 if (size >= 1 << 12)
3294 goto err1;
96518518 3295
86f1ec32 3296 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 3297 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 3298 if (ulen > 0)
3299 usize = sizeof(struct nft_userdata) + ulen;
3300 }
0768b3b3 3301
96518518 3302 err = -ENOMEM;
86f1ec32 3303 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 3304 if (rule == NULL)
3305 goto err1;
3306
889f7ee7 3307 nft_activate_next(net, rule);
0628b123 3308
96518518
PM		 3309 rule->handle = handle;
3310 rule->dlen = size;
86f1ec32 3311 rule->udata = ulen ? 1 : 0;
0768b3b3 3312
86f1ec32
PM		 3313 if (ulen) {
3314 udata = nft_userdata(rule);
3315 udata->len = ulen - 1;
3316 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3317 }
96518518 3318
96518518
PM		 3319 expr = nft_expr_first(rule);
3320 for (i = 0; i < n; i++) {
3321 err = nf_tables_newexpr(&ctx, &info[i], expr);
83d9dcba
PNA		 3322 if (err < 0) {
3323 NL_SET_BAD_ATTR(extack, info[i].attr);
96518518 3324 goto err2;
83d9dcba 3325 }
a654de8f
PNA		 3326
3327 if (info[i].ops->validate)
3328 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3329
ef1f7df9 3330 info[i].ops = NULL;
96518518
PM		 3331 expr = nft_expr_next(expr);
3332 }
3333
96518518 3334 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
ca089878 3335 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
569ccae6
FW		 3336 if (trans == NULL) {
3337 err = -ENOMEM;
3338 goto err2;
3339 }
ca089878
TY		 3340 err = nft_delrule(&ctx, old_rule);
3341 if (err < 0) {
3342 nft_trans_destroy(trans);
569ccae6
FW		 3343 goto err2;
3344 }
3345
3346 list_add_tail_rcu(&rule->list, &old_rule->list);
3347 } else {
c9626a2c
PNA		 3348 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3349 if (!trans) {
569ccae6
FW		 3350 err = -ENOMEM;
3351 goto err2;
3352 }
3353
3354 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3355 if (old_rule)
3356 list_add_rcu(&rule->list, &old_rule->list);
3357 else
3358 list_add_tail_rcu(&rule->list, &chain->rules);
3359 } else {
3360 if (old_rule)
3361 list_add_tail_rcu(&rule->list, &old_rule->list);
3362 else
3363 list_add_rcu(&rule->list, &chain->rules);
3364 }
0628b123 3365 }
2a43ecf9 3366 kvfree(info);
4fefee57 3367 chain->use++;
96518518 3368
a654de8f
PNA		 3369 if (net->nft.validate_state == NFT_VALIDATE_DO)
3370 return nft_table_validate(net, table);
3371
c9626a2c 3372 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
be2861dc 3373 flow = nft_flow_rule_create(net, rule);
c9626a2c
PNA		 3374 if (IS_ERR(flow))
3375 return PTR_ERR(flow);
3376
3377 nft_trans_flow_rule(trans) = flow;
3378 }
3379
a654de8f 3380 return 0;
96518518 3381err2:
bb7b40ae 3382 nf_tables_rule_release(&ctx, rule);
96518518
PM		 3383err1:
3384 for (i = 0; i < n; i++) {
b25a31bf 3385 if (info[i].ops) {
ef1f7df9 3386 module_put(info[i].ops->type->owner);
b25a31bf
TY		 3387 if (info[i].ops->type->release_ops)
3388 info[i].ops->type->release_ops(info[i].ops);
3389 }
96518518 3390 }
2a43ecf9 3391 kvfree(info);
96518518
PM		 3392 return err;
3393}
3394
1a94e38d
PNA		 3395static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3396 const struct nlattr *nla)
3397{
3398 u32 id = ntohl(nla_get_be32(nla));
3399 struct nft_trans *trans;
3400
3401 list_for_each_entry(trans, &net->nft.commit_list, list) {
3402 struct nft_rule *rule = nft_trans_rule(trans);
3403
3404 if (trans->msg_type == NFT_MSG_NEWRULE &&
3405 id == nft_trans_rule_id(trans))
3406 return rule;
3407 }
3408 return ERR_PTR(-ENOENT);
3409}
3410
633c9a84
PNA		 3411static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3412 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3413 const struct nlattr * const nla[],
3414 struct netlink_ext_ack *extack)
96518518
PM		 3415{
3416 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3417 u8 genmask = nft_genmask_next(net);
7c95f6d8 3418 struct nft_table *table;
cf9dc09d
PNA		 3419 struct nft_chain *chain = NULL;
3420 struct nft_rule *rule;
0628b123
PNA		 3421 int family = nfmsg->nfgen_family, err = 0;
3422 struct nft_ctx ctx;
96518518 3423
6001a930
PNA		 3424 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3425 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 3426 if (IS_ERR(table)) {
3427 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3428 return PTR_ERR(table);
36dd1bcc 3429 }
96518518 3430
cf9dc09d 3431 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 3432 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3433 genmask);
36dd1bcc
PNA		 3434 if (IS_ERR(chain)) {
3435 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 3436 return PTR_ERR(chain);
36dd1bcc 3437 }
d0e2c7de
PNA		 3438 if (nft_chain_is_bound(chain))
3439 return -EOPNOTSUPP;
cf9dc09d 3440 }
96518518 3441
98319cb9 3442 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0628b123 3443
cf9dc09d
PNA		 3444 if (chain) {
3445 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 3446 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3447 if (IS_ERR(rule)) {
3448 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 3449 return PTR_ERR(rule);
36dd1bcc 3450 }
96518518 3451
1a94e38d
PNA		 3452 err = nft_delrule(&ctx, rule);
3453 } else if (nla[NFTA_RULE_ID]) {
3454 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 3455 if (IS_ERR(rule)) {
3456 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 3457 return PTR_ERR(rule);
36dd1bcc 3458 }
1a94e38d 3459
5e266fe7 3460 err = nft_delrule(&ctx, rule);
cf9dc09d 3461 } else {
ce24b721 3462 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 3463 }
3464 } else {
3465 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 3466 if (!nft_is_active_next(net, chain))
3467 continue;
3468
cf9dc09d 3469 ctx.chain = chain;
ce24b721 3470 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 3471 if (err < 0)
3472 break;
3473 }
3474 }
3475
3476 return err;
3477}
3478
20a69341
PM		 3479/*
3480 * Sets
3481 */
e32a4dc6
FW		 3482static const struct nft_set_type *nft_set_types[] = {
3483 &nft_set_hash_fast_type,
3484 &nft_set_hash_type,
3485 &nft_set_rhash_type,
3486 &nft_set_bitmap_type,
3487 &nft_set_rbtree_type,
e6abef61 3488#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
7400b063
SB		 3489 &nft_set_pipapo_avx2_type,
3490#endif
e32a4dc6
FW		 3491 &nft_set_pipapo_type,
3492};
20a69341 3493
2b664957 3494#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 3495 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3496 NFT_SET_EVAL)
2b664957 3497
71cc0873 3498static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 3499{
71cc0873 3500 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 3501}
3502
c50b960c
PM		 3503/*
3504 * Select a set implementation based on the data characteristics and the
3505 * given policy. The total memory use might not be known if no size is
3506 * given, in that case the amount of memory per element is used.
3507 */
3508static const struct nft_set_ops *
2b664957
PNA		 3509nft_select_set_ops(const struct nft_ctx *ctx,
3510 const struct nlattr * const nla[],
c50b960c
PM		 3511 const struct nft_set_desc *desc,
3512 enum nft_set_policies policy)
20a69341 3513{
c50b960c
PM		 3514 const struct nft_set_ops *ops, *bops;
3515 struct nft_set_estimate est, best;
2b664957
PNA		 3516 const struct nft_set_type *type;
3517 u32 flags = 0;
e32a4dc6 3518 int i;
20a69341 3519
f102d66b
FW		 3520 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3521 lockdep_nfnl_nft_mutex_not_held();
e32a4dc6 3522
2b664957
PNA		 3523 if (nla[NFTA_SET_FLAGS] != NULL)
3524 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 3525
55af753c
PNA		 3526 bops = NULL;
3527 best.size = ~0;
3528 best.lookup = ~0;
0b5a7874 3529 best.space = ~0;
c50b960c 3530
e32a4dc6
FW		 3531 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3532 type = nft_set_types[i];
71cc0873 3533 ops = &type->ops;
2b664957 3534
71cc0873 3535 if (!nft_set_ops_candidate(type, flags))
20a69341 3536 continue;
2b664957 3537 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 3538 continue;
3539
3540 switch (policy) {
3541 case NFT_SET_POL_PERFORMANCE:
55af753c 3542 if (est.lookup < best.lookup)
c50b960c 3543 break;
644e334e
PNA		 3544 if (est.lookup == best.lookup &&
3545 est.space < best.space)
3546 break;
c50b960c
PM		 3547 continue;
3548 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 3549 if (!desc->size) {
3550 if (est.space < best.space)
3551 break;
3552 if (est.space == best.space &&
3553 est.lookup < best.lookup)
3554 break;
4f2921ca 3555 } else if (est.size < best.size || !bops) {
c50b960c 3556 break;
0b5a7874 3557 }
c50b960c
PM		 3558 continue;
3559 default:
3560 break;
3561 }
3562
c50b960c
PM		 3563 bops = ops;
3564 best = est;
20a69341
PM		 3565 }
3566
c50b960c
PM		 3567 if (bops != NULL)
3568 return bops;
3569
20a69341
PM		 3570 return ERR_PTR(-EOPNOTSUPP);
3571}
3572
3573static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 3574 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3575 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 3576 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 3577 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 3578 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3579 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3580 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3581 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3582 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 3583 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3584 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 3585 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 3586 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3587 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 3588 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3589 .len = NFT_USERDATA_MAXLEN },
8aeff920 3590 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 3591 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
65038428 3592 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
48b0ae04 3593 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
c50b960c
PM		 3594};
3595
3596static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3597 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
f3a2181e 3598 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
20a69341
PM		 3599};
3600
633c9a84 3601static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3602 const struct sk_buff *skb,
3603 const struct nlmsghdr *nlh,
f2a6d766 3604 const struct nlattr * const nla[],
36dd1bcc 3605 struct netlink_ext_ack *extack,
6001a930 3606 u8 genmask, u32 nlpid)
20a69341
PM		 3607{
3608 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 3609 int family = nfmsg->nfgen_family;
7c95f6d8 3610 struct nft_table *table = NULL;
20a69341 3611
20a69341 3612 if (nla[NFTA_SET_TABLE] != NULL) {
cac20fcd 3613 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
6001a930 3614 genmask, nlpid);
36dd1bcc
PNA		 3615 if (IS_ERR(table)) {
3616 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 3617 return PTR_ERR(table);
36dd1bcc 3618 }
20a69341
PM		 3619 }
3620
98319cb9 3621 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 3622 return 0;
3623}
3624
cac20fcd
PNA		 3625static struct nft_set *nft_set_lookup(const struct nft_table *table,
3626 const struct nlattr *nla, u8 genmask)
20a69341
PM		 3627{
3628 struct nft_set *set;
3629
3630 if (nla == NULL)
3631 return ERR_PTR(-EINVAL);
3632
d9adf22a 3633 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 3634 if (!nla_strcmp(nla, set->name) &&
3635 nft_active_genmask(set, genmask))
20a69341
PM		 3636 return set;
3637 }
3638 return ERR_PTR(-ENOENT);
3639}
3640
cac20fcd
PNA		 3641static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3642 const struct nlattr *nla,
3643 u8 genmask)
3ecbfd65
HS		 3644{
3645 struct nft_set *set;
3646
3ecbfd65
HS		 3647 list_for_each_entry(set, &table->sets, list) {
3648 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3649 nft_active_genmask(set, genmask))
3650 return set;
3651 }
3652 return ERR_PTR(-ENOENT);
3653}
3654
cac20fcd
PNA		 3655static struct nft_set *nft_set_lookup_byid(const struct net *net,
3656 const struct nlattr *nla, u8 genmask)
958bee14
PNA		 3657{
3658 struct nft_trans *trans;
3659 u32 id = ntohl(nla_get_be32(nla));
3660
3661 list_for_each_entry(trans, &net->nft.commit_list, list) {
9c7f96fd
AK		 3662 if (trans->msg_type == NFT_MSG_NEWSET) {
3663 struct nft_set *set = nft_trans_set(trans);
37a9cc52 3664
9c7f96fd
AK		 3665 if (id == nft_trans_set_id(trans) &&
3666 nft_active_genmask(set, genmask))
3667 return set;
3668 }
958bee14
PNA		 3669 }
3670 return ERR_PTR(-ENOENT);
3671}
c7a72e3f 3672
10659cba
PNA		 3673struct nft_set *nft_set_lookup_global(const struct net *net,
3674 const struct nft_table *table,
3675 const struct nlattr *nla_set_name,
3676 const struct nlattr *nla_set_id,
3677 u8 genmask)
c7a72e3f
PNA		 3678{
3679 struct nft_set *set;
3680
cac20fcd 3681 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 3682 if (IS_ERR(set)) {
3683 if (!nla_set_id)
3684 return set;
3685
cac20fcd 3686 set = nft_set_lookup_byid(net, nla_set_id, genmask);
c7a72e3f
PNA		 3687 }
3688 return set;
3689}
10659cba 3690EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 3691
20a69341
PM		 3692static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3693 const char *name)
3694{
3695 const struct nft_set *i;
3696 const char *p;
3697 unsigned long *inuse;
60eb1894 3698 unsigned int n = 0, min = 0;
20a69341 3699
38745490 3700 p = strchr(name, '%');
20a69341
PM		 3701 if (p != NULL) {
3702 if (p[1] != 'd' || strchr(p + 2, '%'))
3703 return -EINVAL;
3704
3705 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3706 if (inuse == NULL)
3707 return -ENOMEM;
60eb1894 3708cont:
20a69341 3709 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 3710 int tmp;
3711
37a9cc52
PNA		 3712 if (!nft_is_active_next(ctx->net, set))
3713 continue;
14662917 3714 if (!sscanf(i->name, name, &tmp))
20a69341 3715 continue;
60eb1894 3716 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 3717 continue;
14662917 3718
60eb1894 3719 set_bit(tmp - min, inuse);
20a69341
PM		 3720 }
3721
53b70287 3722 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 3723 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3724 min += BITS_PER_BYTE * PAGE_SIZE;
3725 memset(inuse, 0, PAGE_SIZE);
3726 goto cont;
3727 }
20a69341
PM		 3728 free_page((unsigned long)inuse);
3729 }
3730
38745490
PS		 3731 set->name = kasprintf(GFP_KERNEL, name, min + n);
3732 if (!set->name)
3733 return -ENOMEM;
3734
20a69341 3735 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 3736 if (!nft_is_active_next(ctx->net, i))
3737 continue;
e63aaaa6
AY		 3738 if (!strcmp(set->name, i->name)) {
3739 kfree(set->name);
7fb6f78d 3740 set->name = NULL;
20a69341 3741 return -ENFILE;
e63aaaa6 3742 }
20a69341
PM		 3743 }
3744 return 0;
3745}
3746
917d80d3 3747int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
8e1102d5
FW		 3748{
3749 u64 ms = be64_to_cpu(nla_get_be64(nla));
3750 u64 max = (u64)(~((u64)0));
3751
3752 max = div_u64(max, NSEC_PER_MSEC);
3753 if (ms >= max)
3754 return -ERANGE;
3755
3756 ms *= NSEC_PER_MSEC;
3757 *result = nsecs_to_jiffies64(ms);
3758 return 0;
3759}
3760
917d80d3 3761__be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5 3762{
3b15d09f 3763 return cpu_to_be64(jiffies64_to_msecs(input));
8e1102d5
FW		 3764}
3765
f3a2181e
SB		 3766static int nf_tables_fill_set_concat(struct sk_buff *skb,
3767 const struct nft_set *set)
3768{
3769 struct nlattr *concat, *field;
3770 int i;
3771
3772 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3773 if (!concat)
3774 return -ENOMEM;
3775
3776 for (i = 0; i < set->field_count; i++) {
3777 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3778 if (!field)
3779 return -ENOMEM;
3780
3781 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3782 htonl(set->field_len[i])))
3783 return -ENOMEM;
3784
3785 nla_nest_end(skb, field);
3786 }
3787
3788 nla_nest_end(skb, concat);
3789
3790 return 0;
3791}
3792
20a69341
PM		 3793static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3794 const struct nft_set *set, u16 event, u16 flags)
3795{
3796 struct nfgenmsg *nfmsg;
3797 struct nlmsghdr *nlh;
128ad332 3798 u32 portid = ctx->portid;
65038428 3799 struct nlattr *nest;
128ad332 3800 u32 seq = ctx->seq;
48b0ae04 3801 int i;
20a69341 3802
dedb67c4 3803 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 3804 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3805 flags);
3806 if (nlh == NULL)
3807 goto nla_put_failure;
3808
3809 nfmsg = nlmsg_data(nlh);
36596dad 3810 nfmsg->nfgen_family = ctx->family;
20a69341 3811 nfmsg->version = NFNETLINK_V0;
84d7fce6 3812 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 3813
3814 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3815 goto nla_put_failure;
3816 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3817 goto nla_put_failure;
3ecbfd65
HS		 3818 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3819 NFTA_SET_PAD))
3820 goto nla_put_failure;
20a69341
PM		 3821 if (set->flags != 0)
3822 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3823 goto nla_put_failure;
3824
3825 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3826 goto nla_put_failure;
3827 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3828 goto nla_put_failure;
3829 if (set->flags & NFT_SET_MAP) {
3830 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3831 goto nla_put_failure;
3832 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3833 goto nla_put_failure;
3834 }
8aeff920
PNA		 3835 if (set->flags & NFT_SET_OBJECT &&
3836 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3837 goto nla_put_failure;
20a69341 3838
761da293 3839 if (set->timeout &&
d3e2a111 3840 nla_put_be64(skb, NFTA_SET_TIMEOUT,
8e1102d5 3841 nf_jiffies64_to_msecs(set->timeout),
b46f6ded 3842 NFTA_SET_PAD))
761da293
PM		 3843 goto nla_put_failure;
3844 if (set->gc_int &&
3845 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3846 goto nla_put_failure;
3847
9363dc4b
AB		 3848 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3849 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3850 goto nla_put_failure;
3851 }
3852
6f03bf43
PNA		 3853 if (set->udata &&
3854 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
e6d8ecac
CFG		 3855 goto nla_put_failure;
3856
65038428
PNA		 3857 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3858 if (!nest)
c50b960c
PM		 3859 goto nla_put_failure;
3860 if (set->size &&
3861 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3862 goto nla_put_failure;
f3a2181e
SB		 3863
3864 if (set->field_count > 1 &&
3865 nf_tables_fill_set_concat(skb, set))
3866 goto nla_put_failure;
3867
65038428
PNA		 3868 nla_nest_end(skb, nest);
3869
8cfd9b0f 3870 if (set->num_exprs == 1) {
65038428 3871 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
8cfd9b0f 3872 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
65038428
PNA		 3873 goto nla_put_failure;
3874
3875 nla_nest_end(skb, nest);
48b0ae04
PNA		 3876 } else if (set->num_exprs > 1) {
3877 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3878 if (nest == NULL)
65038428
PNA		 3879 goto nla_put_failure;
3880
48b0ae04
PNA		 3881 for (i = 0; i < set->num_exprs; i++) {
3882 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3883 set->exprs[i]) < 0)
3884 goto nla_put_failure;
3885 }
65038428
PNA		 3886 nla_nest_end(skb, nest);
3887 }
c50b960c 3888
053c095a
JB		 3889 nlmsg_end(skb, nlh);
3890 return 0;
20a69341
PM		 3891
3892nla_put_failure:
3893 nlmsg_trim(skb, nlh);
3894 return -1;
3895}
3896
25e94a99
PNA		 3897static void nf_tables_set_notify(const struct nft_ctx *ctx,
3898 const struct nft_set *set, int event,
3899 gfp_t gfp_flags)
20a69341
PM		 3900{
3901 struct sk_buff *skb;
128ad332 3902 u32 portid = ctx->portid;
20a69341 3903 int err;
8e6cf365
RGB		 3904 char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3905 ctx->table->name, ctx->table->handle,
3906 set->name, set->handle);
3907
3908 audit_log_nfcfg(buf,
3909 ctx->family,
3910 set->field_count,
3911 event == NFT_MSG_NEWSET ?
3912 AUDIT_NFT_OP_SET_REGISTER :
14224039
RGB		 3913 AUDIT_NFT_OP_SET_UNREGISTER,
3914 gfp_flags);
8e6cf365 3915 kfree(buf);
20a69341 3916
128ad332
PNA		 3917 if (!ctx->report &&
3918 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3919 return;
20a69341 3920
31f8441c 3921 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 3922 if (skb == NULL)
3923 goto err;
3924
3925 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3926 if (err < 0) {
3927 kfree_skb(skb);
3928 goto err;
3929 }
3930
67cc570e 3931 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
25e94a99 3932 return;
20a69341 3933err:
25e94a99 3934 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 3935}
3936
5b96af77 3937static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 3938{
3939 const struct nft_set *set;
3940 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 3941 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3942 struct net *net = sock_net(skb->sk);
5b96af77 3943 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 3944
3945 if (cb->args[1])
3946 return skb->len;
3947
e688a7f8 3948 rcu_read_lock();
38e029f1
PNA		 3949 cb->seq = net->nft.base_seq;
3950
36596dad
PNA		 3951 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3952 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 3953 ctx->family != table->family)
36596dad
PNA		 3954 continue;
3955
3956 if (ctx->table && ctx->table != table)
5b96af77
PNA		 3957 continue;
3958
36596dad
PNA		 3959 if (cur_table) {
3960 if (cur_table != table)
c9c8e485
PNA		 3961 continue;
3962
36596dad 3963 cur_table = NULL;
c9c8e485 3964 }
36596dad
PNA		 3965 idx = 0;
3966 list_for_each_entry_rcu(set, &table->sets, list) {
3967 if (idx < s_idx)
3968 goto cont;
3969 if (!nft_is_active(net, set))
3970 goto cont;
5b96af77 3971
36596dad
PNA		 3972 ctx_set = *ctx;
3973 ctx_set.table = table;
98319cb9 3974 ctx_set.family = table->family;
c9c8e485 3975
36596dad
PNA		 3976 if (nf_tables_fill_set(skb, &ctx_set, set,
3977 NFT_MSG_NEWSET,
3978 NLM_F_MULTI) < 0) {
3979 cb->args[0] = idx;
3980 cb->args[2] = (unsigned long) table;
3981 goto done;
c9c8e485 3982 }
36596dad 3983 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 3984cont:
36596dad 3985 idx++;
c9c8e485 3986 }
36596dad
PNA		 3987 if (s_idx)
3988 s_idx = 0;
c9c8e485
PNA		 3989 }
3990 cb->args[1] = 1;
3991done:
e688a7f8 3992 rcu_read_unlock();
c9c8e485
PNA		 3993 return skb->len;
3994}
3995
90fd131a
FW		 3996static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3997{
3998 struct nft_ctx *ctx_dump = NULL;
3999
4000 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4001 if (ctx_dump == NULL)
4002 return -ENOMEM;
4003
4004 cb->data = ctx_dump;
4005 return 0;
4006}
4007
5b96af77 4008static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 4009{
5b96af77
PNA		 4010 kfree(cb->data);
4011 return 0;
20a69341
PM		 4012}
4013
d9adf22a 4014/* called with rcu_read_lock held */
7b8002a1
PNA		 4015static int nf_tables_getset(struct net *net, struct sock *nlsk,
4016 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4017 const struct nlattr * const nla[],
4018 struct netlink_ext_ack *extack)
20a69341 4019{
f2a6d766 4020 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 4021 const struct nft_set *set;
4022 struct nft_ctx ctx;
4023 struct sk_buff *skb2;
c9c8e485 4024 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 4025 int err;
4026
01cfa0a4 4027 /* Verify existence before starting dump */
36dd1bcc 4028 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
6001a930 4029 genmask, 0);
20a69341
PM		 4030 if (err < 0)
4031 return err;
4032
4033 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4034 struct netlink_dump_control c = {
90fd131a 4035 .start = nf_tables_dump_sets_start,
20a69341 4036 .dump = nf_tables_dump_sets,
5b96af77 4037 .done = nf_tables_dump_sets_done,
90fd131a 4038 .data = &ctx,
d9adf22a 4039 .module = THIS_MODULE,
20a69341 4040 };
5b96af77 4041
d9adf22a 4042 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
20a69341
PM		 4043 }
4044
c9c8e485
PNA		 4045 /* Only accept unspec with dump */
4046 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4047 return -EAFNOSUPPORT;
eaa2bcd6
PT		 4048 if (!nla[NFTA_SET_TABLE])
4049 return -EINVAL;
c9c8e485 4050
cac20fcd 4051 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 4052 if (IS_ERR(set))
4053 return PTR_ERR(set);
4054
d9adf22a 4055 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 4056 if (skb2 == NULL)
4057 return -ENOMEM;
4058
4059 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4060 if (err < 0)
ee921183 4061 goto err_fill_set_info;
20a69341 4062
ee921183 4063 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
20a69341 4064
ee921183 4065err_fill_set_info:
20a69341
PM		 4066 kfree_skb(skb2);
4067 return err;
4068}
4069
f3a2181e
SB		 4070static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4071 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4072};
4073
4074static int nft_set_desc_concat_parse(const struct nlattr *attr,
4075 struct nft_set_desc *desc)
4076{
4077 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4078 u32 len;
4079 int err;
4080
4081 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4082 nft_concat_policy, NULL);
4083 if (err < 0)
4084 return err;
4085
4086 if (!tb[NFTA_SET_FIELD_LEN])
4087 return -EINVAL;
4088
4089 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4090
4091 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4092 return -E2BIG;
4093
4094 desc->field_len[desc->field_count++] = len;
4095
4096 return 0;
4097}
4098
4099static int nft_set_desc_concat(struct nft_set_desc *desc,
4100 const struct nlattr *nla)
4101{
4102 struct nlattr *attr;
4103 int rem, err;
4104
4105 nla_for_each_nested(attr, nla, rem) {
4106 if (nla_type(attr) != NFTA_LIST_ELEM)
4107 return -EINVAL;
4108
4109 err = nft_set_desc_concat_parse(attr, desc);
4110 if (err < 0)
4111 return err;
4112 }
4113
4114 return 0;
4115}
4116
f7e840ee 4117static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
c50b960c
PM		 4118 const struct nlattr *nla)
4119{
4120 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4121 int err;
4122
8cb08174
JB		 4123 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4124 nft_set_desc_policy, NULL);
c50b960c
PM		 4125 if (err < 0)
4126 return err;
4127
4128 if (da[NFTA_SET_DESC_SIZE] != NULL)
4129 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
f3a2181e
SB		 4130 if (da[NFTA_SET_DESC_CONCAT])
4131 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
c50b960c 4132
f3a2181e 4133 return err;
c50b960c
PM		 4134}
4135
633c9a84
PNA		 4136static int nf_tables_newset(struct net *net, struct sock *nlsk,
4137 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4138 const struct nlattr * const nla[],
4139 struct netlink_ext_ack *extack)
20a69341
PM		 4140{
4141 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 4142 u8 genmask = nft_genmask_next(net);
98319cb9 4143 int family = nfmsg->nfgen_family;
20a69341 4144 const struct nft_set_ops *ops;
65038428 4145 struct nft_expr *expr = NULL;
20a69341
PM		 4146 struct nft_table *table;
4147 struct nft_set *set;
4148 struct nft_ctx ctx;
38745490 4149 char *name;
4ef360dd 4150 u64 size;
761da293 4151 u64 timeout;
8aeff920 4152 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 4153 struct nft_set_desc desc;
e6d8ecac
CFG		 4154 unsigned char *udata;
4155 u16 udlen;
20a69341 4156 int err;
f3a2181e 4157 int i;
20a69341
PM		 4158
4159 if (nla[NFTA_SET_TABLE] == NULL ||
4160 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 4161 nla[NFTA_SET_KEY_LEN] == NULL ||
4162 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 4163 return -EINVAL;
4164
c50b960c
PM		 4165 memset(&desc, 0, sizeof(desc));
4166
20a69341
PM		 4167 ktype = NFT_DATA_VALUE;
4168 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4169 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4170 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4171 return -EINVAL;
4172 }
4173
c50b960c 4174 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 4175 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4176 return -EINVAL;
4177
4178 flags = 0;
4179 if (nla[NFTA_SET_FLAGS] != NULL) {
4180 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4181 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 4182 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920 4183 NFT_SET_MAP | NFT_SET_EVAL |
b4e70d8d 4184 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
d9583cdf 4185 return -EOPNOTSUPP;
8aeff920 4186 /* Only one of these operations is supported */
acab7131
FW		 4187 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4188 (NFT_SET_MAP | NFT_SET_OBJECT))
4189 return -EOPNOTSUPP;
4190 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4191 (NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 4192 return -EOPNOTSUPP;
20a69341
PM		 4193 }
4194
4195 dtype = 0;
20a69341
PM		 4196 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4197 if (!(flags & NFT_SET_MAP))
4198 return -EINVAL;
4199
4200 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4201 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4202 dtype != NFT_DATA_VERDICT)
4203 return -EINVAL;
4204
4205 if (dtype != NFT_DATA_VERDICT) {
4206 if (nla[NFTA_SET_DATA_LEN] == NULL)
4207 return -EINVAL;
c50b960c 4208 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 4209 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4210 return -EINVAL;
4211 } else
7d740264 4212 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 4213 } else if (flags & NFT_SET_MAP)
4214 return -EINVAL;
4215
8aeff920
PNA		 4216 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4217 if (!(flags & NFT_SET_OBJECT))
4218 return -EINVAL;
4219
4220 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4221 if (objtype == NFT_OBJECT_UNSPEC ||
4222 objtype > NFT_OBJECT_MAX)
d9583cdf 4223 return -EOPNOTSUPP;
8aeff920
PNA		 4224 } else if (flags & NFT_SET_OBJECT)
4225 return -EINVAL;
4226 else
4227 objtype = NFT_OBJECT_UNSPEC;
4228
761da293
PM		 4229 timeout = 0;
4230 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4231 if (!(flags & NFT_SET_TIMEOUT))
4232 return -EINVAL;
8e1102d5
FW		 4233
4234 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4235 if (err)
4236 return err;
761da293
PM		 4237 }
4238 gc_int = 0;
4239 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4240 if (!(flags & NFT_SET_TIMEOUT))
4241 return -EINVAL;
4242 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4243 }
4244
c50b960c
PM		 4245 policy = NFT_SET_POL_PERFORMANCE;
4246 if (nla[NFTA_SET_POLICY] != NULL)
4247 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4248
4249 if (nla[NFTA_SET_DESC] != NULL) {
f7e840ee 4250 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
c50b960c
PM		 4251 if (err < 0)
4252 return err;
4253 }
4254
48b0ae04 4255 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
d56aab26
PNA		 4256 desc.expr = true;
4257
6001a930
PNA		 4258 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4259 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 4260 if (IS_ERR(table)) {
4261 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 4262 return PTR_ERR(table);
36dd1bcc 4263 }
20a69341 4264
98319cb9 4265 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
20a69341 4266
cac20fcd 4267 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 4268 if (IS_ERR(set)) {
36dd1bcc
PNA		 4269 if (PTR_ERR(set) != -ENOENT) {
4270 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4271 return PTR_ERR(set);
36dd1bcc 4272 }
1a28ad74 4273 } else {
36dd1bcc
PNA		 4274 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4275 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4276 return -EEXIST;
36dd1bcc 4277 }
20a69341
PM		 4278 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4279 return -EOPNOTSUPP;
36dd1bcc 4280
20a69341
PM		 4281 return 0;
4282 }
4283
4284 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4285 return -ENOENT;
4286
2b664957 4287 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 4288 if (IS_ERR(ops))
4289 return PTR_ERR(ops);
4290
e6d8ecac
CFG		 4291 udlen = 0;
4292 if (nla[NFTA_SET_USERDATA])
4293 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4294
20a69341
PM		 4295 size = 0;
4296 if (ops->privsize != NULL)
347b408d 4297 size = ops->privsize(nla, &desc);
20a69341 4298
1ff75a3e 4299 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
24d19826
FW		 4300 if (!set)
4301 return -ENOMEM;
20a69341 4302
38745490
PS		 4303 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4304 if (!name) {
4305 err = -ENOMEM;
65038428 4306 goto err_set_name;
38745490
PS		 4307 }
4308
20a69341 4309 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 4310 kfree(name);
20a69341 4311 if (err < 0)
65038428
PNA		 4312 goto err_set_alloc_name;
4313
4314 if (nla[NFTA_SET_EXPR]) {
4315 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4316 if (IS_ERR(expr)) {
4317 err = PTR_ERR(expr);
4318 goto err_set_alloc_name;
4319 }
8cfd9b0f
PNA		 4320 set->exprs[0] = expr;
4321 set->num_exprs++;
48b0ae04
PNA		 4322 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4323 struct nft_expr *expr;
4324 struct nlattr *tmp;
4325 int left;
4326
b4e70d8d
PNA		 4327 if (!(flags & NFT_SET_EXPR)) {
4328 err = -EINVAL;
4329 goto err_set_alloc_name;
4330 }
48b0ae04
PNA		 4331 i = 0;
4332 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4333 if (i == NFT_SET_EXPR_MAX) {
4334 err = -E2BIG;
4335 goto err_set_init;
4336 }
4337 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4338 err = -EINVAL;
4339 goto err_set_init;
4340 }
4341 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4342 if (IS_ERR(expr)) {
4343 err = PTR_ERR(expr);
4344 goto err_set_init;
4345 }
4346 set->exprs[i++] = expr;
4347 set->num_exprs++;
4348 }
65038428 4349 }
20a69341 4350
e6d8ecac
CFG		 4351 udata = NULL;
4352 if (udlen) {
4353 udata = set->data + size;
4354 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4355 }
4356
20a69341 4357 INIT_LIST_HEAD(&set->bindings);
3453c927
PNA		 4358 set->table = table;
4359 write_pnet(&set->net, net);
20a69341
PM		 4360 set->ops = ops;
4361 set->ktype = ktype;
c50b960c 4362 set->klen = desc.klen;
20a69341 4363 set->dtype = dtype;
8aeff920 4364 set->objtype = objtype;
c50b960c 4365 set->dlen = desc.dlen;
20a69341 4366 set->flags = flags;
c50b960c 4367 set->size = desc.size;
9363dc4b 4368 set->policy = policy;
e6d8ecac
CFG		 4369 set->udlen = udlen;
4370 set->udata = udata;
761da293
PM		 4371 set->timeout = timeout;
4372 set->gc_int = gc_int;
3ecbfd65 4373 set->handle = nf_tables_alloc_handle(table);
20a69341 4374
f3a2181e
SB		 4375 set->field_count = desc.field_count;
4376 for (i = 0; i < desc.field_count; i++)
4377 set->field_len[i] = desc.field_len[i];
4378
c50b960c 4379 err = ops->init(set, &desc, nla);
20a69341 4380 if (err < 0)
65038428 4381 goto err_set_init;
20a69341 4382
958bee14 4383 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 4384 if (err < 0)
65038428 4385 goto err_set_trans;
20a69341 4386
e688a7f8 4387 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 4388 table->use++;
20a69341
PM		 4389 return 0;
4390
65038428 4391err_set_trans:
c17c3cdf 4392 ops->destroy(set);
65038428 4393err_set_init:
8cfd9b0f
PNA		 4394 for (i = 0; i < set->num_exprs; i++)
4395 nft_expr_destroy(&ctx, set->exprs[i]);
65038428 4396err_set_alloc_name:
2f6adf48 4397 kfree(set->name);
65038428 4398err_set_name:
1ff75a3e 4399 kvfree(set);
20a69341
PM		 4400 return err;
4401}
4402
0c2a85ed 4403static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
20a69341 4404{
8cfd9b0f
PNA		 4405 int i;
4406
273fe3f1
PNA		 4407 if (WARN_ON(set->use > 0))
4408 return;
4409
8cfd9b0f
PNA		 4410 for (i = 0; i < set->num_exprs; i++)
4411 nft_expr_destroy(ctx, set->exprs[i]);
65038428 4412
20a69341 4413 set->ops->destroy(set);
38745490 4414 kfree(set->name);
1ff75a3e 4415 kvfree(set);
20a69341
PM		 4416}
4417
633c9a84
PNA		 4418static int nf_tables_delset(struct net *net, struct sock *nlsk,
4419 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4420 const struct nlattr * const nla[],
4421 struct netlink_ext_ack *extack)
20a69341 4422{
c9c8e485 4423 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 4424 u8 genmask = nft_genmask_next(net);
36dd1bcc 4425 const struct nlattr *attr;
20a69341
PM		 4426 struct nft_set *set;
4427 struct nft_ctx ctx;
4428 int err;
4429
ec2c9935
PM		 4430 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4431 return -EAFNOSUPPORT;
20a69341
PM		 4432 if (nla[NFTA_SET_TABLE] == NULL)
4433 return -EINVAL;
4434
36dd1bcc 4435 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
6001a930 4436 genmask, NETLINK_CB(skb).portid);
20a69341
PM		 4437 if (err < 0)
4438 return err;
4439
36dd1bcc
PNA		 4440 if (nla[NFTA_SET_HANDLE]) {
4441 attr = nla[NFTA_SET_HANDLE];
4442 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4443 } else {
4444 attr = nla[NFTA_SET_NAME];
4445 set = nft_set_lookup(ctx.table, attr, genmask);
4446 }
a8278400 4447
36dd1bcc
PNA		 4448 if (IS_ERR(set)) {
4449 NL_SET_BAD_ATTR(extack, attr);
4450 return PTR_ERR(set);
4451 }
273fe3f1 4452 if (set->use ||
36dd1bcc
PNA		 4453 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4454 NL_SET_BAD_ATTR(extack, attr);
20a69341 4455 return -EBUSY;
36dd1bcc 4456 }
20a69341 4457
ee01d542 4458 return nft_delset(&ctx, set);
20a69341
PM		 4459}
4460
345023b0
PNA		 4461static int nft_validate_register_store(const struct nft_ctx *ctx,
4462 enum nft_registers reg,
4463 const struct nft_data *data,
4464 enum nft_data_types type,
4465 unsigned int len);
4466
20a69341 4467static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 4468 struct nft_set *set,
20a69341 4469 const struct nft_set_iter *iter,
de70185d 4470 struct nft_set_elem *elem)
20a69341 4471{
fe2811eb 4472 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4473 enum nft_registers dreg;
4474
4475 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 4476 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4477 set->dtype == NFT_DATA_VERDICT ?
4478 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4479 set->dlen);
20a69341
PM		 4480}
4481
4482int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4483 struct nft_set_binding *binding)
4484{
4485 struct nft_set_binding *i;
4486 struct nft_set_iter iter;
4487
273fe3f1
PNA		 4488 if (set->use == UINT_MAX)
4489 return -EOVERFLOW;
4490
408070d6 4491 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 4492 return -EBUSY;
4493
11113e19 4494 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 4495 /* If the set is already bound to the same chain all
4496 * jumps are already validated for that chain.
4497 */
4498 list_for_each_entry(i, &set->bindings, list) {
a4684402 4499 if (i->flags & NFT_SET_MAP &&
11113e19 4500 i->chain == binding->chain)
20a69341
PM		 4501 goto bind;
4502 }
4503
8588ac09 4504 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4505 iter.skip = 0;
4506 iter.count = 0;
4507 iter.err = 0;
4508 iter.fn = nf_tables_bind_check_setelem;
4509
4510 set->ops->walk(ctx, set, &iter);
a02f4248 4511 if (iter.err < 0)
20a69341 4512 return iter.err;
20a69341
PM		 4513 }
4514bind:
4515 binding->chain = ctx->chain;
e688a7f8 4516 list_add_tail_rcu(&binding->list, &set->bindings);
f6ac8585 4517 nft_set_trans_bind(ctx, set);
273fe3f1 4518 set->use++;
f6ac8585 4519
20a69341
PM		 4520 return 0;
4521}
63aea290 4522EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341 4523
3b0a081d
FW		 4524static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4525 struct nft_set_binding *binding, bool event)
20a69341 4526{
e688a7f8 4527 list_del_rcu(&binding->list);
20a69341 4528
f6ac8585 4529 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
cd5125d8 4530 list_del_rcu(&set->list);
f6ac8585
PNA		 4531 if (event)
4532 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4533 GFP_KERNEL);
4534 }
20a69341
PM		 4535}
4536
273fe3f1
PNA		 4537void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4538 struct nft_set_binding *binding,
4539 enum nft_trans_phase phase)
4540{
4541 switch (phase) {
4542 case NFT_TRANS_PREPARE:
4543 set->use--;
4544 return;
4545 case NFT_TRANS_ABORT:
4546 case NFT_TRANS_RELEASE:
4547 set->use--;
954d8297 4548 fallthrough;
273fe3f1
PNA		 4549 default:
4550 nf_tables_unbind_set(ctx, set, binding,
4551 phase == NFT_TRANS_COMMIT);
4552 }
4553}
4554EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4555
cd5125d8
FW		 4556void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4557{
f6ac8585 4558 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
0c2a85ed 4559 nft_set_destroy(ctx, set);
cd5125d8
FW		 4560}
4561EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4562
3ac4c07a
PM		 4563const struct nft_set_ext_type nft_set_ext_types[] = {
4564 [NFT_SET_EXT_KEY] = {
7d740264 4565 .align = __alignof__(u32),
3ac4c07a
PM		 4566 },
4567 [NFT_SET_EXT_DATA] = {
7d740264 4568 .align = __alignof__(u32),
3ac4c07a 4569 },
563125a7
PNA		 4570 [NFT_SET_EXT_EXPRESSIONS] = {
4571 .align = __alignof__(struct nft_set_elem_expr),
f25ad2e9 4572 },
8aeff920
PNA		 4573 [NFT_SET_EXT_OBJREF] = {
4574 .len = sizeof(struct nft_object *),
4575 .align = __alignof__(struct nft_object *),
4576 },
3ac4c07a
PM		 4577 [NFT_SET_EXT_FLAGS] = {
4578 .len = sizeof(u8),
4579 .align = __alignof__(u8),
4580 },
c3e1b005
PM		 4581 [NFT_SET_EXT_TIMEOUT] = {
4582 .len = sizeof(u64),
4583 .align = __alignof__(u64),
4584 },
4585 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 4586 .len = sizeof(u64),
4587 .align = __alignof__(u64),
c3e1b005 4588 },
68e942e8
PM		 4589 [NFT_SET_EXT_USERDATA] = {
4590 .len = sizeof(struct nft_userdata),
4591 .align = __alignof__(struct nft_userdata),
4592 },
7b225d0b
PNA		 4593 [NFT_SET_EXT_KEY_END] = {
4594 .align = __alignof__(u32),
4595 },
3ac4c07a 4596};
3ac4c07a 4597
20a69341
PM		 4598/*
4599 * Set elements
4600 */
4601
4602static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4603 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4604 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4605 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 4606 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
79ebb5bb 4607 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
68e942e8
PM		 4608 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4609 .len = NFT_USERDATA_MAXLEN },
467697d2 4610 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
9332d27d
FW		 4611 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4612 .len = NFT_OBJ_MAXNAMELEN - 1 },
7b225d0b 4613 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
48b0ae04 4614 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
20a69341
PM		 4615};
4616
4617static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 4618 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4619 .len = NFT_TABLE_MAXNAMELEN - 1 },
4620 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4621 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 4622 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 4623 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 4624};
4625
633c9a84 4626static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 4627 const struct sk_buff *skb,
4628 const struct nlmsghdr *nlh,
f2a6d766 4629 const struct nlattr * const nla[],
36dd1bcc 4630 struct netlink_ext_ack *extack,
6001a930 4631 u8 genmask, u32 nlpid)
20a69341
PM		 4632{
4633 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 4634 int family = nfmsg->nfgen_family;
7c95f6d8 4635 struct nft_table *table;
20a69341 4636
cac20fcd 4637 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6001a930 4638 genmask, nlpid);
36dd1bcc
PNA		 4639 if (IS_ERR(table)) {
4640 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341 4641 return PTR_ERR(table);
36dd1bcc 4642 }
20a69341 4643
98319cb9 4644 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 4645 return 0;
4646}
4647
563125a7
PNA		 4648static int nft_set_elem_expr_dump(struct sk_buff *skb,
4649 const struct nft_set *set,
4650 const struct nft_set_ext *ext)
4651{
4652 struct nft_set_elem_expr *elem_expr;
4653 u32 size, num_exprs = 0;
4654 struct nft_expr *expr;
48b0ae04 4655 struct nlattr *nest;
563125a7
PNA		 4656
4657 elem_expr = nft_set_ext_expr(ext);
4658 nft_setelem_expr_foreach(expr, elem_expr, size)
4659 num_exprs++;
4660
4661 if (num_exprs == 1) {
4662 expr = nft_setelem_expr_at(elem_expr, 0);
4663 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4664 return -1;
4665
4666 return 0;
48b0ae04
PNA		 4667 } else if (num_exprs > 1) {
4668 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4669 if (nest == NULL)
4670 goto nla_put_failure;
563125a7 4671
48b0ae04
PNA		 4672 nft_setelem_expr_foreach(expr, elem_expr, size) {
4673 expr = nft_setelem_expr_at(elem_expr, size);
4674 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4675 goto nla_put_failure;
4676 }
4677 nla_nest_end(skb, nest);
4678 }
563125a7 4679 return 0;
48b0ae04
PNA		 4680
4681nla_put_failure:
4682 return -1;
563125a7
PNA		 4683}
4684
20a69341
PM		 4685static int nf_tables_fill_setelem(struct sk_buff *skb,
4686 const struct nft_set *set,
4687 const struct nft_set_elem *elem)
4688{
fe2811eb 4689 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4690 unsigned char *b = skb_tail_pointer(skb);
4691 struct nlattr *nest;
4692
ae0be8de 4693 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
20a69341
PM		 4694 if (nest == NULL)
4695 goto nla_put_failure;
4696
fe2811eb
PM		 4697 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4698 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 4699 goto nla_put_failure;
4700
7b225d0b
PNA		 4701 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4702 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4703 NFT_DATA_VALUE, set->klen) < 0)
4704 goto nla_put_failure;
4705
fe2811eb
PM		 4706 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4707 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 4708 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4709 set->dlen) < 0)
4710 goto nla_put_failure;
4711
563125a7
PNA		 4712 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4713 nft_set_elem_expr_dump(skb, set, ext))
f25ad2e9
PM		 4714 goto nla_put_failure;
4715
8aeff920
PNA		 4716 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4717 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
d152159b 4718 (*nft_set_ext_obj(ext))->key.name) < 0)
8aeff920
PNA		 4719 goto nla_put_failure;
4720
fe2811eb
PM		 4721 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4722 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4723 htonl(*nft_set_ext_flags(ext))))
4724 goto nla_put_failure;
20a69341 4725
c3e1b005
PM		 4726 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4727 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 4728 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 4729 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4730 goto nla_put_failure;
4731
4732 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 4733 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 4734
4735 expires = *nft_set_ext_expiration(ext);
8e1102d5 4736 if (time_before64(now, expires))
c3e1b005
PM		 4737 expires -= now;
4738 else
4739 expires = 0;
4740
4741 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 4742 nf_jiffies64_to_msecs(expires),
b46f6ded 4743 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4744 goto nla_put_failure;
4745 }
4746
68e942e8
PM		 4747 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4748 struct nft_userdata *udata;
4749
4750 udata = nft_set_ext_userdata(ext);
4751 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4752 udata->len + 1, udata->data))
4753 goto nla_put_failure;
4754 }
4755
20a69341
PM		 4756 nla_nest_end(skb, nest);
4757 return 0;
4758
4759nla_put_failure:
4760 nlmsg_trim(skb, b);
4761 return -EMSGSIZE;
4762}
4763
4764struct nft_set_dump_args {
4765 const struct netlink_callback *cb;
4766 struct nft_set_iter iter;
4767 struct sk_buff *skb;
4768};
4769
4770static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 4771 struct nft_set *set,
20a69341 4772 const struct nft_set_iter *iter,
de70185d 4773 struct nft_set_elem *elem)
20a69341
PM		 4774{
4775 struct nft_set_dump_args *args;
4776
4777 args = container_of(iter, struct nft_set_dump_args, iter);
4778 return nf_tables_fill_setelem(args->skb, set, elem);
4779}
4780
fa803605
LZ		 4781struct nft_set_dump_ctx {
4782 const struct nft_set *set;
4783 struct nft_ctx ctx;
4784};
4785
20a69341
PM		 4786static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4787{
fa803605 4788 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 4789 struct net *net = sock_net(skb->sk);
fa803605 4790 struct nft_table *table;
de70185d 4791 struct nft_set *set;
20a69341 4792 struct nft_set_dump_args args;
fa803605 4793 bool set_found = false;
20a69341
PM		 4794 struct nfgenmsg *nfmsg;
4795 struct nlmsghdr *nlh;
4796 struct nlattr *nest;
4797 u32 portid, seq;
fa803605 4798 int event;
20a69341 4799
fa803605 4800 rcu_read_lock();
36596dad
PNA		 4801 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4802 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 4803 dump_ctx->ctx.family != table->family)
fa803605 4804 continue;
20a69341 4805
36596dad
PNA		 4806 if (table != dump_ctx->ctx.table)
4807 continue;
20a69341 4808
36596dad
PNA		 4809 list_for_each_entry_rcu(set, &table->sets, list) {
4810 if (set == dump_ctx->set) {
4811 set_found = true;
4812 break;
fa803605 4813 }
fa803605
LZ		 4814 }
4815 break;
4816 }
4817
4818 if (!set_found) {
4819 rcu_read_unlock();
4820 return -ENOENT;
4821 }
20a69341 4822
dedb67c4 4823 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 4824 portid = NETLINK_CB(cb->skb).portid;
4825 seq = cb->nlh->nlmsg_seq;
4826
4827 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4828 NLM_F_MULTI);
4829 if (nlh == NULL)
4830 goto nla_put_failure;
4831
4832 nfmsg = nlmsg_data(nlh);
98319cb9 4833 nfmsg->nfgen_family = table->family;
20a69341 4834 nfmsg->version = NFNETLINK_V0;
fa803605 4835 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 4836
fa803605 4837 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 4838 goto nla_put_failure;
4839 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4840 goto nla_put_failure;
4841
ae0be8de 4842 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
20a69341
PM		 4843 if (nest == NULL)
4844 goto nla_put_failure;
4845
8588ac09
PNA		 4846 args.cb = cb;
4847 args.skb = skb;
fa803605 4848 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 4849 args.iter.skip = cb->args[0];
4850 args.iter.count = 0;
4851 args.iter.err = 0;
4852 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 4853 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4854 rcu_read_unlock();
20a69341
PM		 4855
4856 nla_nest_end(skb, nest);
4857 nlmsg_end(skb, nlh);
4858
4859 if (args.iter.err && args.iter.err != -EMSGSIZE)
4860 return args.iter.err;
4861 if (args.iter.count == cb->args[0])
4862 return 0;
4863
4864 cb->args[0] = args.iter.count;
4865 return skb->len;
4866
4867nla_put_failure:
fa803605 4868 rcu_read_unlock();
20a69341
PM		 4869 return -ENOSPC;
4870}
4871
90fd131a
FW		 4872static int nf_tables_dump_set_start(struct netlink_callback *cb)
4873{
4874 struct nft_set_dump_ctx *dump_ctx = cb->data;
4875
4876 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4877
4878 return cb->data ? 0 : -ENOMEM;
4879}
4880
fa803605
LZ		 4881static int nf_tables_dump_set_done(struct netlink_callback *cb)
4882{
4883 kfree(cb->data);
4884 return 0;
4885}
4886
d60ce62f
AB		 4887static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4888 const struct nft_ctx *ctx, u32 seq,
4889 u32 portid, int event, u16 flags,
4890 const struct nft_set *set,
4891 const struct nft_set_elem *elem)
4892{
4893 struct nfgenmsg *nfmsg;
4894 struct nlmsghdr *nlh;
4895 struct nlattr *nest;
4896 int err;
4897
dedb67c4 4898 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 4899 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4900 flags);
4901 if (nlh == NULL)
4902 goto nla_put_failure;
4903
4904 nfmsg = nlmsg_data(nlh);
36596dad 4905 nfmsg->nfgen_family = ctx->family;
d60ce62f 4906 nfmsg->version = NFNETLINK_V0;
84d7fce6 4907 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 4908
4909 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4910 goto nla_put_failure;
4911 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4912 goto nla_put_failure;
4913
ae0be8de 4914 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
d60ce62f
AB		 4915 if (nest == NULL)
4916 goto nla_put_failure;
4917
4918 err = nf_tables_fill_setelem(skb, set, elem);
4919 if (err < 0)
4920 goto nla_put_failure;
4921
4922 nla_nest_end(skb, nest);
4923
053c095a
JB		 4924 nlmsg_end(skb, nlh);
4925 return 0;
d60ce62f
AB		 4926
4927nla_put_failure:
4928 nlmsg_trim(skb, nlh);
4929 return -1;
4930}
4931
ba0e4d99
PNA		 4932static int nft_setelem_parse_flags(const struct nft_set *set,
4933 const struct nlattr *attr, u32 *flags)
4934{
4935 if (attr == NULL)
4936 return 0;
4937
4938 *flags = ntohl(nla_get_be32(attr));
4939 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4940 return -EINVAL;
4941 if (!(set->flags & NFT_SET_INTERVAL) &&
4942 *flags & NFT_SET_ELEM_INTERVAL_END)
4943 return -EINVAL;
4944
4945 return 0;
4946}
4947
20a1452c
PNA		 4948static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4949 struct nft_data *key, struct nlattr *attr)
4950{
4951 struct nft_data_desc desc;
4952 int err;
4953
4954 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4955 if (err < 0)
4956 return err;
4957
4958 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4959 nft_data_release(key, desc.type);
4960 return -EINVAL;
4961 }
4962
4963 return 0;
4964}
4965
fdb9c405
PNA		 4966static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4967 struct nft_data_desc *desc,
4968 struct nft_data *data,
4969 struct nlattr *attr)
4970{
4971 int err;
4972
4973 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4974 if (err < 0)
4975 return err;
4976
4977 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4978 nft_data_release(data, desc->type);
4979 return -EINVAL;
4980 }
4981
4982 return 0;
4983}
4984
ba0e4d99
PNA		 4985static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4986 const struct nlattr *attr)
4987{
4988 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 4989 struct nft_set_elem elem;
4990 struct sk_buff *skb;
4991 uint32_t flags = 0;
4992 void *priv;
4993 int err;
4994
8cb08174
JB		 4995 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4996 nft_set_elem_policy, NULL);
ba0e4d99
PNA		 4997 if (err < 0)
4998 return err;
4999
5000 if (!nla[NFTA_SET_ELEM_KEY])
5001 return -EINVAL;
5002
5003 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5004 if (err < 0)
5005 return err;
5006
20a1452c
PNA		 5007 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5008 nla[NFTA_SET_ELEM_KEY]);
ba0e4d99
PNA		 5009 if (err < 0)
5010 return err;
5011
7b225d0b
PNA		 5012 if (nla[NFTA_SET_ELEM_KEY_END]) {
5013 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5014 nla[NFTA_SET_ELEM_KEY_END]);
5015 if (err < 0)
5016 return err;
5017 }
5018
ba0e4d99
PNA		 5019 priv = set->ops->get(ctx->net, set, &elem, flags);
5020 if (IS_ERR(priv))
5021 return PTR_ERR(priv);
5022
5023 elem.priv = priv;
ba0e4d99
PNA		 5024
5025 err = -ENOMEM;
d9adf22a 5026 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99 5027 if (skb == NULL)
ee921183 5028 return err;
ba0e4d99
PNA		 5029
5030 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5031 NFT_MSG_NEWSETELEM, 0, set, &elem);
5032 if (err < 0)
ee921183 5033 goto err_fill_setelem;
ba0e4d99 5034
ee921183 5035 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
ba0e4d99 5036
ee921183 5037err_fill_setelem:
ba0e4d99 5038 kfree_skb(skb);
ee921183 5039 return err;
ba0e4d99
PNA		 5040}
5041
d9adf22a 5042/* called with rcu_read_lock held */
ba0e4d99
PNA		 5043static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
5044 struct sk_buff *skb, const struct nlmsghdr *nlh,
5045 const struct nlattr * const nla[],
5046 struct netlink_ext_ack *extack)
5047{
5048 u8 genmask = nft_genmask_cur(net);
5049 struct nft_set *set;
5050 struct nlattr *attr;
5051 struct nft_ctx ctx;
5052 int rem, err = 0;
5053
36dd1bcc 5054 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
6001a930 5055 genmask, NETLINK_CB(skb).portid);
ba0e4d99
PNA		 5056 if (err < 0)
5057 return err;
5058
cac20fcd 5059 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 5060 if (IS_ERR(set))
5061 return PTR_ERR(set);
5062
5063 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5064 struct netlink_dump_control c = {
90fd131a 5065 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 5066 .dump = nf_tables_dump_set,
5067 .done = nf_tables_dump_set_done,
d9adf22a 5068 .module = THIS_MODULE,
ba0e4d99 5069 };
90fd131a
FW		 5070 struct nft_set_dump_ctx dump_ctx = {
5071 .set = set,
5072 .ctx = ctx,
5073 };
ba0e4d99 5074
90fd131a 5075 c.data = &dump_ctx;
d9adf22a 5076 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
ba0e4d99
PNA		 5077 }
5078
5079 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5080 return -EINVAL;
5081
5082 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5083 err = nft_get_set_elem(&ctx, set, attr);
5084 if (err < 0)
5085 break;
5086 }
5087
5088 return err;
5089}
5090
25e94a99
PNA		 5091static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5092 const struct nft_set *set,
5093 const struct nft_set_elem *elem,
5094 int event, u16 flags)
d60ce62f 5095{
128ad332
PNA		 5096 struct net *net = ctx->net;
5097 u32 portid = ctx->portid;
d60ce62f
AB		 5098 struct sk_buff *skb;
5099 int err;
8e6cf365
RGB		 5100 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
5101 ctx->table->name, ctx->table->handle,
5102 set->name, set->handle);
5103
5104 audit_log_nfcfg(buf,
5105 ctx->family,
5106 set->handle,
5107 event == NFT_MSG_NEWSETELEM ?
5108 AUDIT_NFT_OP_SETELEM_REGISTER :
14224039
RGB		 5109 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5110 GFP_KERNEL);
8e6cf365 5111 kfree(buf);
d60ce62f 5112
128ad332 5113 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5114 return;
d60ce62f 5115
d60ce62f
AB		 5116 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5117 if (skb == NULL)
5118 goto err;
5119
5120 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5121 set, elem);
5122 if (err < 0) {
5123 kfree_skb(skb);
5124 goto err;
5125 }
5126
67cc570e 5127 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
25e94a99 5128 return;
d60ce62f 5129err:
25e94a99 5130 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 5131}
5132
60319eb1
PNA		 5133static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5134 int msg_type,
5135 struct nft_set *set)
5136{
5137 struct nft_trans *trans;
5138
5139 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5140 if (trans == NULL)
5141 return NULL;
5142
5143 nft_trans_elem_set(trans) = set;
5144 return trans;
5145}
5146
a7fc9368
PNA		 5147struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5148 const struct nft_set *set,
5149 const struct nlattr *attr)
5150{
5151 struct nft_expr *expr;
5152 int err;
5153
5154 expr = nft_expr_init(ctx, attr);
5155 if (IS_ERR(expr))
5156 return expr;
5157
5158 err = -EOPNOTSUPP;
5159 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5160 goto err_set_elem_expr;
5161
5162 if (expr->ops->type->flags & NFT_EXPR_GC) {
5163 if (set->flags & NFT_SET_TIMEOUT)
5164 goto err_set_elem_expr;
5165 if (!set->ops->gc_init)
5166 goto err_set_elem_expr;
5167 set->ops->gc_init(set);
5168 }
5169
5170 return expr;
5171
5172err_set_elem_expr:
5173 nft_expr_destroy(ctx, expr);
5174 return ERR_PTR(err);
5175}
5176
22fe54d5
PM		 5177void *nft_set_elem_init(const struct nft_set *set,
5178 const struct nft_set_ext_tmpl *tmpl,
7b225d0b
PNA		 5179 const u32 *key, const u32 *key_end,
5180 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
fe2811eb
PM		 5181{
5182 struct nft_set_ext *ext;
5183 void *elem;
5184
5185 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5186 if (elem == NULL)
5187 return NULL;
5188
5189 ext = nft_set_elem_ext(set, elem);
5190 nft_set_ext_init(ext, tmpl);
5191
5192 memcpy(nft_set_ext_key(ext), key, set->klen);
7b225d0b
PNA		 5193 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5194 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
fe2811eb
PM		 5195 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5196 memcpy(nft_set_ext_data(ext), data, set->dlen);
79ebb5bb
LGL		 5197 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5198 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5199 if (expiration == 0)
5200 *nft_set_ext_expiration(ext) += timeout;
5201 }
c3e1b005
PM		 5202 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5203 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 5204
5205 return elem;
5206}
5207
563125a7
PNA		 5208static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5209 struct nft_expr *expr)
475beb9c
PNA		 5210{
5211 if (expr->ops->destroy_clone) {
5212 expr->ops->destroy_clone(ctx, expr);
5213 module_put(expr->ops->type->owner);
5214 } else {
5215 nf_tables_expr_destroy(ctx, expr);
5216 }
5217}
5218
563125a7
PNA		 5219static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5220 struct nft_set_elem_expr *elem_expr)
5221{
5222 struct nft_expr *expr;
5223 u32 size;
5224
5225 nft_setelem_expr_foreach(expr, elem_expr, size)
5226 __nft_set_elem_expr_destroy(ctx, expr);
5227}
5228
61f9e292
LZ		 5229void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5230 bool destroy_expr)
61edafbb
PM		 5231{
5232 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 5233 struct nft_ctx ctx = {
5234 .net = read_pnet(&set->net),
5235 .family = set->table->family,
5236 };
61edafbb 5237
59105446 5238 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 5239 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 5240 nft_data_release(nft_set_ext_data(ext), set->dtype);
563125a7 5241 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
475beb9c 5242 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
371ebcbb 5243
8aeff920
PNA		 5244 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5245 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 5246 kfree(elem);
5247}
5248EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5249
59105446
PNA		 5250/* Only called from commit path, nft_set_elem_deactivate() already deals with
5251 * the refcounting from the preparation phase.
5252 */
3453c927
PNA		 5253static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5254 const struct nft_set *set, void *elem)
59105446
PNA		 5255{
5256 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5257
563125a7 5258 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
475beb9c
PNA		 5259 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5260
59105446
PNA		 5261 kfree(elem);
5262}
5263
fca05d4d
PNA		 5264int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5265 struct nft_expr *expr_array[])
8cfd9b0f
PNA		 5266{
5267 struct nft_expr *expr;
5268 int err, i, k;
5269
5270 for (i = 0; i < set->num_exprs; i++) {
5271 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5272 if (!expr)
5273 goto err_expr;
5274
5275 err = nft_expr_clone(expr, set->exprs[i]);
5276 if (err < 0) {
5277 nft_expr_destroy(ctx, expr);
5278 goto err_expr;
5279 }
5280 expr_array[i] = expr;
5281 }
5282
5283 return 0;
5284
5285err_expr:
161b838e
CIK		 5286 for (k = i - 1; k >= 0; k--)
5287 nft_expr_destroy(ctx, expr_array[k]);
8cfd9b0f
PNA		 5288
5289 return -ENOMEM;
5290}
5291
563125a7
PNA		 5292static void nft_set_elem_expr_setup(const struct nft_set_ext *ext, int i,
5293 struct nft_expr *expr_array[])
5294{
5295 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5296 struct nft_expr *expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5297
5298 memcpy(expr, expr_array[i], expr_array[i]->ops->size);
5299 elem_expr->size += expr_array[i]->ops->size;
5300 kfree(expr_array[i]);
5301 expr_array[i] = NULL;
5302}
5303
60319eb1 5304static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 5305 const struct nlattr *attr, u32 nlmsg_flags)
20a69341 5306{
8cfd9b0f 5307 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
20a69341 5308 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 5309 u8 genmask = nft_genmask_next(ctx->net);
664899e8 5310 u32 flags = 0, size = 0, num_exprs = 0;
fe2811eb 5311 struct nft_set_ext_tmpl tmpl;
c016c7e4 5312 struct nft_set_ext *ext, *ext2;
20a69341
PM		 5313 struct nft_set_elem elem;
5314 struct nft_set_binding *binding;
8aeff920 5315 struct nft_object *obj = NULL;
68e942e8 5316 struct nft_userdata *udata;
20a1452c 5317 struct nft_data_desc desc;
20a69341 5318 enum nft_registers dreg;
60319eb1 5319 struct nft_trans *trans;
c3e1b005 5320 u64 timeout;
79ebb5bb 5321 u64 expiration;
8cfd9b0f 5322 int err, i;
68e942e8 5323 u8 ulen;
20a69341 5324
8cb08174
JB		 5325 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5326 nft_set_elem_policy, NULL);
20a69341
PM		 5327 if (err < 0)
5328 return err;
5329
5330 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5331 return -EINVAL;
5332
fe2811eb
PM		 5333 nft_set_ext_prepare(&tmpl);
5334
0e9091d6
PNA		 5335 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5336 if (err < 0)
5337 return err;
5338 if (flags != 0)
5339 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 5340
5341 if (set->flags & NFT_SET_MAP) {
5342 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 5343 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341
PM		 5344 return -EINVAL;
5345 } else {
5346 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5347 return -EINVAL;
5348 }
5349
bffc124b
PNA		 5350 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5351 (nla[NFTA_SET_ELEM_DATA] ||
5352 nla[NFTA_SET_ELEM_OBJREF] ||
5353 nla[NFTA_SET_ELEM_TIMEOUT] ||
5354 nla[NFTA_SET_ELEM_EXPIRATION] ||
5355 nla[NFTA_SET_ELEM_USERDATA] ||
48b0ae04
PNA		 5356 nla[NFTA_SET_ELEM_EXPR] ||
5357 nla[NFTA_SET_ELEM_EXPRESSIONS]))
bffc124b
PNA		 5358 return -EINVAL;
5359
c3e1b005
PM		 5360 timeout = 0;
5361 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5362 if (!(set->flags & NFT_SET_TIMEOUT))
5363 return -EINVAL;
8e1102d5
FW		 5364 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5365 &timeout);
5366 if (err)
5367 return err;
c3e1b005
PM		 5368 } else if (set->flags & NFT_SET_TIMEOUT) {
5369 timeout = set->timeout;
5370 }
5371
79ebb5bb
LGL		 5372 expiration = 0;
5373 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5374 if (!(set->flags & NFT_SET_TIMEOUT))
5375 return -EINVAL;
5376 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5377 &expiration);
5378 if (err)
5379 return err;
5380 }
5381
8cfd9b0f
PNA		 5382 if (nla[NFTA_SET_ELEM_EXPR]) {
5383 struct nft_expr *expr;
5384
664899e8 5385 if (set->num_exprs && set->num_exprs != 1)
8cfd9b0f
PNA		 5386 return -EOPNOTSUPP;
5387
40944452
PNA		 5388 expr = nft_set_elem_expr_alloc(ctx, set,
5389 nla[NFTA_SET_ELEM_EXPR]);
5390 if (IS_ERR(expr))
5391 return PTR_ERR(expr);
65038428 5392
8cfd9b0f 5393 expr_array[0] = expr;
664899e8 5394 num_exprs = 1;
65038428 5395
664899e8 5396 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
8cfd9b0f 5397 err = -EOPNOTSUPP;
65038428 5398 goto err_set_elem_expr;
8cfd9b0f 5399 }
48b0ae04
PNA		 5400 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5401 struct nft_expr *expr;
5402 struct nlattr *tmp;
5403 int left;
65038428 5404
48b0ae04
PNA		 5405 i = 0;
5406 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
664899e8
PNA		 5407 if (i == NFT_SET_EXPR_MAX ||
5408 (set->num_exprs && set->num_exprs == i)) {
48b0ae04
PNA		 5409 err = -E2BIG;
5410 goto err_set_elem_expr;
5411 }
5412 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5413 err = -EINVAL;
5414 goto err_set_elem_expr;
5415 }
5416 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5417 if (IS_ERR(expr)) {
5418 err = PTR_ERR(expr);
5419 goto err_set_elem_expr;
5420 }
5421 expr_array[i] = expr;
664899e8 5422 num_exprs++;
48b0ae04 5423
664899e8 5424 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
48b0ae04
PNA		 5425 err = -EOPNOTSUPP;
5426 goto err_set_elem_expr;
5427 }
5428 i++;
5429 }
664899e8 5430 if (set->num_exprs && set->num_exprs != i) {
48b0ae04 5431 err = -EOPNOTSUPP;
65038428 5432 goto err_set_elem_expr;
48b0ae04 5433 }
8cfd9b0f
PNA		 5434 } else if (set->num_exprs > 0) {
5435 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5436 if (err < 0)
5437 goto err_set_elem_expr_clone;
664899e8
PNA		 5438
5439 num_exprs = set->num_exprs;
40944452
PNA		 5440 }
5441
20a1452c
PNA		 5442 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5443 nla[NFTA_SET_ELEM_KEY]);
20a69341 5444 if (err < 0)
40944452 5445 goto err_set_elem_expr;
20a69341 5446
20a1452c 5447 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7b225d0b
PNA		 5448
5449 if (nla[NFTA_SET_ELEM_KEY_END]) {
5450 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5451 nla[NFTA_SET_ELEM_KEY_END]);
5452 if (err < 0)
5453 goto err_parse_key;
5454
5455 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5456 }
5457
c3e1b005
PM		 5458 if (timeout > 0) {
5459 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5460 if (timeout != set->timeout)
5461 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5462 }
fe2811eb 5463
664899e8
PNA		 5464 if (num_exprs) {
5465 for (i = 0; i < num_exprs; i++)
563125a7
PNA		 5466 size += expr_array[i]->ops->size;
5467
5468 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5469 sizeof(struct nft_set_elem_expr) +
5470 size);
5471 }
40944452 5472
8aeff920
PNA		 5473 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5474 if (!(set->flags & NFT_SET_OBJECT)) {
5475 err = -EINVAL;
7b225d0b 5476 goto err_parse_key_end;
8aeff920 5477 }
4d44175a
FW		 5478 obj = nft_obj_lookup(ctx->net, ctx->table,
5479 nla[NFTA_SET_ELEM_OBJREF],
cac20fcd 5480 set->objtype, genmask);
8aeff920
PNA		 5481 if (IS_ERR(obj)) {
5482 err = PTR_ERR(obj);
7b225d0b 5483 goto err_parse_key_end;
8aeff920
PNA		 5484 }
5485 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5486 }
5487
20a69341 5488 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
fdb9c405
PNA		 5489 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5490 nla[NFTA_SET_ELEM_DATA]);
20a69341 5491 if (err < 0)
7b225d0b 5492 goto err_parse_key_end;
20a69341 5493
20a69341
PM		 5494 dreg = nft_type_to_reg(set->dtype);
5495 list_for_each_entry(binding, &set->bindings, list) {
5496 struct nft_ctx bind_ctx = {
58c78e10 5497 .net = ctx->net,
36596dad 5498 .family = ctx->family,
20a69341 5499 .table = ctx->table,
7c95f6d8 5500 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 5501 };
5502
11113e19
PM		 5503 if (!(binding->flags & NFT_SET_MAP))
5504 continue;
5505
1ec10212 5506 err = nft_validate_register_store(&bind_ctx, dreg,
fdb9c405 5507 &elem.data.val,
20a1452c 5508 desc.type, desc.len);
20a69341 5509 if (err < 0)
7b225d0b 5510 goto err_parse_data;
a654de8f 5511
20a1452c 5512 if (desc.type == NFT_DATA_VERDICT &&
fdb9c405
PNA		 5513 (elem.data.val.verdict.code == NFT_GOTO ||
5514 elem.data.val.verdict.code == NFT_JUMP))
a654de8f
PNA		 5515 nft_validate_state_update(ctx->net,
5516 NFT_VALIDATE_NEED);
20a69341 5517 }
fe2811eb 5518
20a1452c 5519 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
20a69341
PM		 5520 }
5521
68e942e8
PM		 5522 /* The full maximum length of userdata can exceed the maximum
5523 * offset value (U8_MAX) for following extensions, therefor it
5524 * must be the last extension added.
5525 */
5526 ulen = 0;
5527 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5528 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5529 if (ulen > 0)
5530 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5531 ulen);
5532 }
5533
fe2811eb 5534 err = -ENOMEM;
7b225d0b 5535 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
fdb9c405 5536 elem.key_end.val.data, elem.data.val.data,
79ebb5bb 5537 timeout, expiration, GFP_KERNEL);
fe2811eb 5538 if (elem.priv == NULL)
7b225d0b 5539 goto err_parse_data;
fe2811eb
PM		 5540
5541 ext = nft_set_elem_ext(set, elem.priv);
5542 if (flags)
5543 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 5544 if (ulen > 0) {
5545 udata = nft_set_ext_userdata(ext);
5546 udata->len = ulen - 1;
5547 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5548 }
8aeff920
PNA		 5549 if (obj) {
5550 *nft_set_ext_obj(ext) = obj;
5551 obj->use++;
5552 }
664899e8 5553 for (i = 0; i < num_exprs; i++)
563125a7 5554 nft_set_elem_expr_setup(ext, i, expr_array);
fe2811eb 5555
60319eb1
PNA		 5556 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5557 if (trans == NULL)
7b225d0b 5558 goto err_trans;
60319eb1 5559
69086658 5560 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 5561 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5562 if (err) {
5563 if (err == -EEXIST) {
9744a6fc
PNA		 5564 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5565 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5566 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
77a92189 5567 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7b225d0b 5568 goto err_element_clash;
8aeff920
PNA		 5569 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5570 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5571 memcmp(nft_set_ext_data(ext),
5572 nft_set_ext_data(ext2), set->dlen) != 0) ||
5573 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5574 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5575 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
77a92189 5576 goto err_element_clash;
c016c7e4
PNA		 5577 else if (!(nlmsg_flags & NLM_F_EXCL))
5578 err = 0;
8c2d45b2
PNA		 5579 } else if (err == -ENOTEMPTY) {
5580 /* ENOTEMPTY reports overlapping between this element
5581 * and an existing one.
5582 */
5583 err = -EEXIST;
c016c7e4 5584 }
7b225d0b 5585 goto err_element_clash;
c016c7e4 5586 }
20a69341 5587
35d0ac90
PNA		 5588 if (set->size &&
5589 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5590 err = -ENFILE;
7b225d0b 5591 goto err_set_full;
35d0ac90
PNA		 5592 }
5593
60319eb1 5594 nft_trans_elem(trans) = elem;
46bbafce 5595 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 5596 return 0;
5597
7b225d0b 5598err_set_full:
5cb82a38 5599 set->ops->remove(ctx->net, set, &elem);
7b225d0b 5600err_element_clash:
60319eb1 5601 kfree(trans);
7b225d0b 5602err_trans:
b91d9036
TY		 5603 if (obj)
5604 obj->use--;
475beb9c
PNA		 5605
5606 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7b225d0b 5607err_parse_data:
20a69341 5608 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fdb9c405 5609 nft_data_release(&elem.data.val, desc.type);
7b225d0b
PNA		 5610err_parse_key_end:
5611 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5612err_parse_key:
20a1452c 5613 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
40944452 5614err_set_elem_expr:
664899e8 5615 for (i = 0; i < num_exprs && expr_array[i]; i++)
8cfd9b0f
PNA		 5616 nft_expr_destroy(ctx, expr_array[i]);
5617err_set_elem_expr_clone:
20a69341
PM		 5618 return err;
5619}
5620
633c9a84
PNA		 5621static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5622 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5623 const struct nlattr * const nla[],
5624 struct netlink_ext_ack *extack)
20a69341 5625{
f2a6d766 5626 u8 genmask = nft_genmask_next(net);
20a69341
PM		 5627 const struct nlattr *attr;
5628 struct nft_set *set;
5629 struct nft_ctx ctx;
a654de8f 5630 int rem, err;
20a69341 5631
7d5570ca
PNA		 5632 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5633 return -EINVAL;
5634
36dd1bcc 5635 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
6001a930 5636 genmask, NETLINK_CB(skb).portid);
20a69341
PM		 5637 if (err < 0)
5638 return err;
5639
a3073c17
PNA		 5640 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5641 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5642 if (IS_ERR(set))
5643 return PTR_ERR(set);
958bee14 5644
20a69341
PM		 5645 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5646 return -EBUSY;
5647
5648 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 5649 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 5650 if (err < 0)
a654de8f 5651 return err;
20a69341 5652 }
a654de8f
PNA		 5653
5654 if (net->nft.validate_state == NFT_VALIDATE_DO)
5655 return nft_table_validate(net, ctx.table);
5656
5657 return 0;
20a69341
PM		 5658}
5659
59105446
PNA		 5660/**
5661 * nft_data_hold - hold a nft_data item
5662 *
5663 * @data: struct nft_data to release
5664 * @type: type of data
5665 *
5666 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5667 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5668 * NFT_GOTO verdicts. This function must be called on active data objects
5669 * from the second phase of the commit protocol.
5670 */
bb7b40ae 5671void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446 5672{
d0e2c7de
PNA		 5673 struct nft_chain *chain;
5674 struct nft_rule *rule;
5675
59105446
PNA		 5676 if (type == NFT_DATA_VERDICT) {
5677 switch (data->verdict.code) {
5678 case NFT_JUMP:
5679 case NFT_GOTO:
d0e2c7de
PNA		 5680 chain = data->verdict.chain;
5681 chain->use++;
5682
5683 if (!nft_chain_is_bound(chain))
5684 break;
5685
5686 chain->table->use++;
5687 list_for_each_entry(rule, &chain->rules, list)
5688 chain->use++;
5689
5690 nft_chain_add(chain->table, chain);
59105446
PNA		 5691 break;
5692 }
5693 }
5694}
5695
5696static void nft_set_elem_activate(const struct net *net,
5697 const struct nft_set *set,
5698 struct nft_set_elem *elem)
5699{
5700 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5701
5702 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5703 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5704 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5705 (*nft_set_ext_obj(ext))->use++;
5706}
5707
5708static void nft_set_elem_deactivate(const struct net *net,
5709 const struct nft_set *set,
5710 struct nft_set_elem *elem)
5711{
5712 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5713
5714 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5715 nft_data_release(nft_set_ext_data(ext), set->dtype);
5716 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5717 (*nft_set_ext_obj(ext))->use--;
5718}
5719
60319eb1 5720static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 5721 const struct nlattr *attr)
5722{
5723 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 5724 struct nft_set_ext_tmpl tmpl;
20a69341 5725 struct nft_set_elem elem;
3971ca14 5726 struct nft_set_ext *ext;
60319eb1 5727 struct nft_trans *trans;
3971ca14
PNA		 5728 u32 flags = 0;
5729 void *priv;
20a69341
PM		 5730 int err;
5731
8cb08174
JB		 5732 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5733 nft_set_elem_policy, NULL);
20a69341 5734 if (err < 0)
20a1452c 5735 return err;
20a69341 5736
20a69341 5737 if (nla[NFTA_SET_ELEM_KEY] == NULL)
20a1452c 5738 return -EINVAL;
20a69341 5739
3971ca14
PNA		 5740 nft_set_ext_prepare(&tmpl);
5741
5742 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5743 if (err < 0)
5744 return err;
5745 if (flags != 0)
5746 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5747
20a1452c
PNA		 5748 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5749 nla[NFTA_SET_ELEM_KEY]);
20a69341 5750 if (err < 0)
20a1452c 5751 return err;
20a69341 5752
20a1452c 5753 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
3971ca14 5754
7b225d0b
PNA		 5755 if (nla[NFTA_SET_ELEM_KEY_END]) {
5756 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5757 nla[NFTA_SET_ELEM_KEY_END]);
5758 if (err < 0)
5759 return err;
5760
5761 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5762 }
5763
3971ca14 5764 err = -ENOMEM;
7b225d0b
PNA		 5765 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5766 elem.key_end.val.data, NULL, 0, 0,
5767 GFP_KERNEL);
3971ca14 5768 if (elem.priv == NULL)
20a1452c 5769 goto fail_elem;
3971ca14
PNA		 5770
5771 ext = nft_set_elem_ext(set, elem.priv);
5772 if (flags)
5773 *nft_set_ext_flags(ext) = flags;
5774
60319eb1 5775 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
20a1452c
PNA		 5776 if (trans == NULL)
5777 goto fail_trans;
20a69341 5778
42a55769 5779 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 5780 if (priv == NULL) {
cc02e457 5781 err = -ENOENT;
20a1452c 5782 goto fail_ops;
cc02e457 5783 }
3971ca14
PNA		 5784 kfree(elem.priv);
5785 elem.priv = priv;
cc02e457 5786
59105446
PNA		 5787 nft_set_elem_deactivate(ctx->net, set, &elem);
5788
60319eb1 5789 nft_trans_elem(trans) = elem;
46bbafce 5790 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 5791 return 0;
cc02e457 5792
20a1452c 5793fail_ops:
cc02e457 5794 kfree(trans);
20a1452c 5795fail_trans:
3971ca14 5796 kfree(elem.priv);
20a1452c
PNA		 5797fail_elem:
5798 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
20a69341
PM		 5799 return err;
5800}
5801
8411b644 5802static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 5803 struct nft_set *set,
8411b644 5804 const struct nft_set_iter *iter,
de70185d 5805 struct nft_set_elem *elem)
8411b644
PNA		 5806{
5807 struct nft_trans *trans;
5808 int err;
5809
5810 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5811 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5812 if (!trans)
5813 return -ENOMEM;
5814
1ba1c414 5815 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 5816 err = -ENOENT;
5817 goto err1;
5818 }
b2c11e4b 5819 set->ndeact++;
8411b644 5820
7acfda53 5821 nft_set_elem_deactivate(ctx->net, set, elem);
de70185d
PNA		 5822 nft_trans_elem_set(trans) = set;
5823 nft_trans_elem(trans) = *elem;
8411b644
PNA		 5824 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5825
5826 return 0;
5827err1:
5828 kfree(trans);
5829 return err;
5830}
5831
633c9a84
PNA		 5832static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5833 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5834 const struct nlattr * const nla[],
5835 struct netlink_ext_ack *extack)
20a69341 5836{
f2a6d766 5837 u8 genmask = nft_genmask_next(net);
20a69341
PM		 5838 const struct nlattr *attr;
5839 struct nft_set *set;
5840 struct nft_ctx ctx;
60319eb1 5841 int rem, err = 0;
20a69341 5842
36dd1bcc 5843 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
6001a930 5844 genmask, NETLINK_CB(skb).portid);
20a69341
PM		 5845 if (err < 0)
5846 return err;
5847
cac20fcd 5848 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 5849 if (IS_ERR(set))
5850 return PTR_ERR(set);
5851 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5852 return -EBUSY;
5853
8411b644 5854 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 5855 struct nft_set_iter iter = {
5856 .genmask = genmask,
5857 .fn = nft_flush_set,
8411b644 5858 };
baa2d42c 5859 set->ops->walk(&ctx, set, &iter);
8411b644 5860
baa2d42c 5861 return iter.err;
8411b644
PNA		 5862 }
5863
20a69341
PM		 5864 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5865 err = nft_del_setelem(&ctx, set, attr);
5866 if (err < 0)
60319eb1 5867 break;
4fefee57 5868
3dd0673a 5869 set->ndeact++;
20a69341 5870 }
60319eb1 5871 return err;
20a69341
PM		 5872}
5873
cfed7e1b
PM		 5874void nft_set_gc_batch_release(struct rcu_head *rcu)
5875{
5876 struct nft_set_gc_batch *gcb;
5877 unsigned int i;
5878
5879 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5880 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 5881 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 5882 kfree(gcb);
5883}
cfed7e1b
PM		 5884
5885struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5886 gfp_t gfp)
5887{
5888 struct nft_set_gc_batch *gcb;
5889
5890 gcb = kzalloc(sizeof(*gcb), gfp);
5891 if (gcb == NULL)
5892 return gcb;
5893 gcb->head.set = set;
5894 return gcb;
5895}
cfed7e1b 5896
e5009240
PNA		 5897/*
5898 * Stateful objects
5899 */
5900
5901/**
5902 * nft_register_obj- register nf_tables stateful object type
3db86c39 5903 * @obj_type: object type
e5009240
PNA		 5904 *
5905 * Registers the object type for use with nf_tables. Returns zero on
5906 * success or a negative errno code otherwise.
5907 */
5908int nft_register_obj(struct nft_object_type *obj_type)
5909{
5910 if (obj_type->type == NFT_OBJECT_UNSPEC)
5911 return -EINVAL;
5912
5913 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5914 list_add_rcu(&obj_type->list, &nf_tables_objects);
5915 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5916 return 0;
5917}
5918EXPORT_SYMBOL_GPL(nft_register_obj);
5919
5920/**
5921 * nft_unregister_obj - unregister nf_tables object type
3db86c39 5922 * @obj_type: object type
e5009240
PNA		 5923 *
5924 * Unregisters the object type for use with nf_tables.
5925 */
5926void nft_unregister_obj(struct nft_object_type *obj_type)
5927{
5928 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5929 list_del_rcu(&obj_type->list);
5930 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5931}
5932EXPORT_SYMBOL_GPL(nft_unregister_obj);
5933
4d44175a
FW		 5934struct nft_object *nft_obj_lookup(const struct net *net,
5935 const struct nft_table *table,
cac20fcd
PNA		 5936 const struct nlattr *nla, u32 objtype,
5937 u8 genmask)
e5009240 5938{
4d44175a
FW		 5939 struct nft_object_hash_key k = { .table = table };
5940 char search[NFT_OBJ_MAXNAMELEN];
5941 struct rhlist_head *tmp, *list;
e5009240
PNA		 5942 struct nft_object *obj;
5943
872f6903 5944 nla_strscpy(search, nla, sizeof(search));
4d44175a
FW		 5945 k.name = search;
5946
5947 WARN_ON_ONCE(!rcu_read_lock_held() &&
5948 !lockdep_commit_lock_is_held(net));
5949
5950 rcu_read_lock();
5951 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5952 if (!list)
5953 goto out;
5954
5955 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5956 if (objtype == obj->ops->type->type &&
5957 nft_active_genmask(obj, genmask)) {
5958 rcu_read_unlock();
e5009240 5959 return obj;
4d44175a 5960 }
e5009240 5961 }
4d44175a
FW		 5962out:
5963 rcu_read_unlock();
e5009240
PNA		 5964 return ERR_PTR(-ENOENT);
5965}
cac20fcd 5966EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 5967
cac20fcd
PNA		 5968static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5969 const struct nlattr *nla,
5970 u32 objtype, u8 genmask)
3ecbfd65
HS		 5971{
5972 struct nft_object *obj;
5973
5974 list_for_each_entry(obj, &table->objects, list) {
5975 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5976 objtype == obj->ops->type->type &&
5977 nft_active_genmask(obj, genmask))
5978 return obj;
5979 }
5980 return ERR_PTR(-ENOENT);
5981}
5982
e5009240 5983static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 5984 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5985 .len = NFT_TABLE_MAXNAMELEN - 1 },
5986 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5987 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 5988 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5989 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 5990 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
b131c964
JGG		 5991 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
5992 .len = NFT_USERDATA_MAXLEN },
e5009240
PNA		 5993};
5994
84fba055
FW		 5995static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5996 const struct nft_object_type *type,
e5009240
PNA		 5997 const struct nlattr *attr)
5998{
5b4c6e38 5999 struct nlattr **tb;
dfc46034 6000 const struct nft_object_ops *ops;
e5009240 6001 struct nft_object *obj;
5b4c6e38
GS		 6002 int err = -ENOMEM;
6003
6004 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6005 if (!tb)
6006 goto err1;
e5009240
PNA		 6007
6008 if (attr) {
8cb08174
JB		 6009 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6010 type->policy, NULL);
e5009240 6011 if (err < 0)
5b4c6e38 6012 goto err2;
e5009240
PNA		 6013 } else {
6014 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6015 }
6016
dfc46034
PBG		 6017 if (type->select_ops) {
6018 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6019 if (IS_ERR(ops)) {
6020 err = PTR_ERR(ops);
5b4c6e38 6021 goto err2;
dfc46034
PBG		 6022 }
6023 } else {
6024 ops = type->ops;
6025 }
6026
e5009240 6027 err = -ENOMEM;
dfc46034 6028 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5b4c6e38
GS		 6029 if (!obj)
6030 goto err2;
e5009240 6031
dfc46034 6032 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 6033 if (err < 0)
5b4c6e38 6034 goto err3;
e5009240 6035
dfc46034
PBG		 6036 obj->ops = ops;
6037
5b4c6e38 6038 kfree(tb);
e5009240 6039 return obj;
5b4c6e38 6040err3:
e5009240 6041 kfree(obj);
5b4c6e38
GS		 6042err2:
6043 kfree(tb);
e5009240
PNA		 6044err1:
6045 return ERR_PTR(err);
6046}
6047
6048static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 6049 struct nft_object *obj, bool reset)
e5009240
PNA		 6050{
6051 struct nlattr *nest;
6052
ae0be8de 6053 nest = nla_nest_start_noflag(skb, attr);
e5009240
PNA		 6054 if (!nest)
6055 goto nla_put_failure;
dfc46034 6056 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 6057 goto nla_put_failure;
6058 nla_nest_end(skb, nest);
6059 return 0;
6060
6061nla_put_failure:
6062 return -1;
6063}
6064
6065static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6066{
6067 const struct nft_object_type *type;
6068
6069 list_for_each_entry(type, &nf_tables_objects, list) {
6070 if (objtype == type->type)
6071 return type;
6072 }
6073 return NULL;
6074}
6075
452238e8
FW		 6076static const struct nft_object_type *
6077nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 6078{
6079 const struct nft_object_type *type;
6080
6081 type = __nft_obj_type_get(objtype);
6082 if (type != NULL && try_module_get(type->owner))
6083 return type;
6084
f102d66b 6085 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 6086#ifdef CONFIG_MODULES
6087 if (type == NULL) {
eb014de4 6088 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
e5009240
PNA		 6089 return ERR_PTR(-EAGAIN);
6090 }
6091#endif
6092 return ERR_PTR(-ENOENT);
6093}
6094
d62d0ba9
FFM		 6095static int nf_tables_updobj(const struct nft_ctx *ctx,
6096 const struct nft_object_type *type,
6097 const struct nlattr *attr,
6098 struct nft_object *obj)
6099{
6100 struct nft_object *newobj;
6101 struct nft_trans *trans;
6102 int err;
6103
6104 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6105 sizeof(struct nft_trans_obj));
6106 if (!trans)
6107 return -ENOMEM;
6108
6109 newobj = nft_obj_init(ctx, type, attr);
6110 if (IS_ERR(newobj)) {
6111 err = PTR_ERR(newobj);
b74ae961 6112 goto err_free_trans;
d62d0ba9
FFM		 6113 }
6114
6115 nft_trans_obj(trans) = obj;
6116 nft_trans_obj_update(trans) = true;
6117 nft_trans_obj_newobj(trans) = newobj;
6118 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6119
6120 return 0;
b74ae961
DC		 6121
6122err_free_trans:
d62d0ba9 6123 kfree(trans);
d62d0ba9
FFM		 6124 return err;
6125}
6126
e5009240
PNA		 6127static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6128 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 6129 const struct nlattr * const nla[],
6130 struct netlink_ext_ack *extack)
e5009240
PNA		 6131{
6132 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6133 const struct nft_object_type *type;
6134 u8 genmask = nft_genmask_next(net);
6135 int family = nfmsg->nfgen_family;
e5009240
PNA		 6136 struct nft_table *table;
6137 struct nft_object *obj;
6138 struct nft_ctx ctx;
6139 u32 objtype;
6140 int err;
6141
6142 if (!nla[NFTA_OBJ_TYPE] ||
6143 !nla[NFTA_OBJ_NAME] ||
6144 !nla[NFTA_OBJ_DATA])
6145 return -EINVAL;
6146
6001a930
PNA		 6147 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6148 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 6149 if (IS_ERR(table)) {
6150 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6151 return PTR_ERR(table);
36dd1bcc 6152 }
e5009240
PNA		 6153
6154 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 6155 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 6156 if (IS_ERR(obj)) {
6157 err = PTR_ERR(obj);
36dd1bcc
PNA		 6158 if (err != -ENOENT) {
6159 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6160 return err;
36dd1bcc 6161 }
1a28ad74 6162 } else {
36dd1bcc
PNA		 6163 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6164 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6165 return -EEXIST;
36dd1bcc 6166 }
d62d0ba9
FFM		 6167 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6168 return -EOPNOTSUPP;
6169
fd57d0cb 6170 type = __nft_obj_type_get(objtype);
d62d0ba9
FFM		 6171 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6172
6173 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
e5009240
PNA		 6174 }
6175
98319cb9 6176 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240 6177
452238e8 6178 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 6179 if (IS_ERR(type))
6180 return PTR_ERR(type);
6181
84fba055 6182 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 6183 if (IS_ERR(obj)) {
6184 err = PTR_ERR(obj);
b131c964 6185 goto err_init;
e5009240 6186 }
d152159b 6187 obj->key.table = table;
3ecbfd65
HS		 6188 obj->handle = nf_tables_alloc_handle(table);
6189
d152159b
FW		 6190 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6191 if (!obj->key.name) {
61509575 6192 err = -ENOMEM;
b131c964
JGG		 6193 goto err_strdup;
6194 }
6195
6196 if (nla[NFTA_OBJ_USERDATA]) {
85db827a 6197 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
b131c964
JGG		 6198 if (obj->udata == NULL)
6199 goto err_userdata;
6200
85db827a 6201 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
61509575 6202 }
e5009240
PNA		 6203
6204 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6205 if (err < 0)
b131c964 6206 goto err_trans;
e5009240 6207
4d44175a
FW		 6208 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6209 nft_objname_ht_params);
6210 if (err < 0)
b131c964 6211 goto err_obj_ht;
4d44175a 6212
e5009240
PNA		 6213 list_add_tail_rcu(&obj->list, &table->objects);
6214 table->use++;
6215 return 0;
b131c964 6216err_obj_ht:
4d44175a
FW		 6217 /* queued in transaction log */
6218 INIT_LIST_HEAD(&obj->list);
6219 return err;
b131c964 6220err_trans:
d152159b 6221 kfree(obj->key.name);
b131c964
JGG		 6222err_userdata:
6223 kfree(obj->udata);
6224err_strdup:
dfc46034 6225 if (obj->ops->destroy)
00bfb320 6226 obj->ops->destroy(&ctx, obj);
e5009240 6227 kfree(obj);
b131c964 6228err_init:
e5009240
PNA		 6229 module_put(type->owner);
6230 return err;
6231}
6232
6233static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6234 u32 portid, u32 seq, int event, u32 flags,
6235 int family, const struct nft_table *table,
43da04a5 6236 struct nft_object *obj, bool reset)
e5009240
PNA		 6237{
6238 struct nfgenmsg *nfmsg;
6239 struct nlmsghdr *nlh;
6240
dedb67c4 6241 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 6242 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6243 if (nlh == NULL)
6244 goto nla_put_failure;
6245
6246 nfmsg = nlmsg_data(nlh);
6247 nfmsg->nfgen_family = family;
6248 nfmsg->version = NFNETLINK_V0;
6249 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6250
6251 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
d152159b 6252 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
dfc46034 6253 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 6254 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 6255 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6256 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6257 NFTA_OBJ_PAD))
e5009240
PNA		 6258 goto nla_put_failure;
6259
b131c964
JGG		 6260 if (obj->udata &&
6261 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6262 goto nla_put_failure;
6263
e5009240
PNA		 6264 nlmsg_end(skb, nlh);
6265 return 0;
6266
6267nla_put_failure:
6268 nlmsg_trim(skb, nlh);
6269 return -1;
6270}
6271
a9fea2a3 6272struct nft_obj_filter {
e46abbcc 6273 char *table;
a9fea2a3
PNA		 6274 u32 type;
6275};
6276
e5009240
PNA		 6277static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6278{
6279 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 6280 const struct nft_table *table;
e5009240 6281 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 6282 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 6283 struct net *net = sock_net(skb->sk);
6284 int family = nfmsg->nfgen_family;
43da04a5
PNA		 6285 struct nft_object *obj;
6286 bool reset = false;
6287
6288 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6289 reset = true;
e5009240
PNA		 6290
6291 rcu_read_lock();
6292 cb->seq = net->nft.base_seq;
6293
36596dad 6294 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 6295 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 6296 continue;
6297
36596dad
PNA		 6298 list_for_each_entry_rcu(obj, &table->objects, list) {
6299 if (!nft_is_active(net, obj))
6300 goto cont;
6301 if (idx < s_idx)
6302 goto cont;
6303 if (idx > s_idx)
6304 memset(&cb->args[1], 0,
6305 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 6306 if (filter && filter->table &&
36596dad
PNA		 6307 strcmp(filter->table, table->name))
6308 goto cont;
6309 if (filter &&
6310 filter->type != NFT_OBJECT_UNSPEC &&
6311 obj->ops->type->type != filter->type)
6312 goto cont;
a9fea2a3 6313
8e6cf365 6314 if (reset) {
68df2ed5 6315 char *buf = kasprintf(GFP_ATOMIC,
8e6cf365
RGB		 6316 "%s:%llu;?:0",
6317 table->name,
6318 table->handle);
6319
6320 audit_log_nfcfg(buf,
6321 family,
6322 obj->handle,
14224039 6323 AUDIT_NFT_OP_OBJ_RESET,
68df2ed5 6324 GFP_ATOMIC);
8e6cf365
RGB		 6325 kfree(buf);
6326 }
6327
36596dad
PNA		 6328 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6329 cb->nlh->nlmsg_seq,
6330 NFT_MSG_NEWOBJ,
6331 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 6332 table->family, table,
36596dad
PNA		 6333 obj, reset) < 0)
6334 goto done;
e5009240 6335
36596dad 6336 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 6337cont:
36596dad 6338 idx++;
e5009240
PNA		 6339 }
6340 }
6341done:
6342 rcu_read_unlock();
6343
6344 cb->args[0] = idx;
6345 return skb->len;
6346}
6347
90fd131a 6348static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 6349{
90fd131a
FW		 6350 const struct nlattr * const *nla = cb->data;
6351 struct nft_obj_filter *filter = NULL;
e46abbcc 6352
90fd131a
FW		 6353 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6354 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6355 if (!filter)
6356 return -ENOMEM;
6357
6358 if (nla[NFTA_OBJ_TABLE]) {
6359 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6360 if (!filter->table) {
6361 kfree(filter);
6362 return -ENOMEM;
6363 }
6364 }
6365
6366 if (nla[NFTA_OBJ_TYPE])
6367 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 6368 }
a9fea2a3 6369
90fd131a 6370 cb->data = filter;
a9fea2a3
PNA		 6371 return 0;
6372}
6373
90fd131a 6374static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 6375{
90fd131a 6376 struct nft_obj_filter *filter = cb->data;
a9fea2a3 6377
90fd131a
FW		 6378 if (filter) {
6379 kfree(filter->table);
6380 kfree(filter);
e46abbcc 6381 }
a9fea2a3 6382
90fd131a 6383 return 0;
a9fea2a3
PNA		 6384}
6385
d9adf22a 6386/* called with rcu_read_lock held */
e5009240
PNA		 6387static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6388 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 6389 const struct nlattr * const nla[],
6390 struct netlink_ext_ack *extack)
e5009240
PNA		 6391{
6392 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6393 u8 genmask = nft_genmask_cur(net);
6394 int family = nfmsg->nfgen_family;
e5009240
PNA		 6395 const struct nft_table *table;
6396 struct nft_object *obj;
6397 struct sk_buff *skb2;
43da04a5 6398 bool reset = false;
e5009240
PNA		 6399 u32 objtype;
6400 int err;
6401
6402 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6403 struct netlink_dump_control c = {
90fd131a 6404 .start = nf_tables_dump_obj_start,
e5009240 6405 .dump = nf_tables_dump_obj,
a9fea2a3 6406 .done = nf_tables_dump_obj_done,
d9adf22a 6407 .module = THIS_MODULE,
90fd131a 6408 .data = (void *)nla,
e5009240 6409 };
a9fea2a3 6410
d9adf22a 6411 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
e5009240
PNA		 6412 }
6413
6414 if (!nla[NFTA_OBJ_NAME] ||
6415 !nla[NFTA_OBJ_TYPE])
6416 return -EINVAL;
6417
6001a930 6418 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
36dd1bcc
PNA		 6419 if (IS_ERR(table)) {
6420 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6421 return PTR_ERR(table);
36dd1bcc 6422 }
e5009240
PNA		 6423
6424 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 6425 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 6426 if (IS_ERR(obj)) {
6427 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6428 return PTR_ERR(obj);
36dd1bcc 6429 }
e5009240 6430
d9adf22a 6431 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 6432 if (!skb2)
6433 return -ENOMEM;
6434
43da04a5
PNA		 6435 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6436 reset = true;
6437
8e6cf365 6438 if (reset) {
14224039 6439 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
8e6cf365
RGB		 6440 table->name, table->handle);
6441
6442 audit_log_nfcfg(buf,
6443 family,
6444 obj->handle,
14224039 6445 AUDIT_NFT_OP_OBJ_RESET,
68df2ed5 6446 GFP_ATOMIC);
8e6cf365
RGB		 6447 kfree(buf);
6448 }
6449
e5009240
PNA		 6450 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6451 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 6452 family, table, obj, reset);
e5009240 6453 if (err < 0)
ee921183 6454 goto err_fill_obj_info;
e5009240 6455
ee921183
PNA		 6456 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6457
6458err_fill_obj_info:
e5009240
PNA		 6459 kfree_skb(skb2);
6460 return err;
e5009240
PNA		 6461}
6462
00bfb320 6463static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 6464{
dfc46034 6465 if (obj->ops->destroy)
00bfb320 6466 obj->ops->destroy(ctx, obj);
e5009240 6467
dfc46034 6468 module_put(obj->ops->type->owner);
d152159b 6469 kfree(obj->key.name);
bc7a7082 6470 kfree(obj->udata);
e5009240
PNA		 6471 kfree(obj);
6472}
6473
6474static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 6475 struct sk_buff *skb, const struct nlmsghdr *nlh,
6476 const struct nlattr * const nla[],
6477 struct netlink_ext_ack *extack)
e5009240
PNA		 6478{
6479 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6480 u8 genmask = nft_genmask_next(net);
6481 int family = nfmsg->nfgen_family;
36dd1bcc 6482 const struct nlattr *attr;
e5009240
PNA		 6483 struct nft_table *table;
6484 struct nft_object *obj;
6485 struct nft_ctx ctx;
6486 u32 objtype;
6487
6488 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 6489 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 6490 return -EINVAL;
6491
6001a930
PNA		 6492 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6493 NETLINK_CB(skb).portid);
36dd1bcc
PNA		 6494 if (IS_ERR(table)) {
6495 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6496 return PTR_ERR(table);
36dd1bcc 6497 }
e5009240
PNA		 6498
6499 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 6500 if (nla[NFTA_OBJ_HANDLE]) {
6501 attr = nla[NFTA_OBJ_HANDLE];
6502 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6503 } else {
6504 attr = nla[NFTA_OBJ_NAME];
4d44175a 6505 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
36dd1bcc
PNA		 6506 }
6507
6508 if (IS_ERR(obj)) {
6509 NL_SET_BAD_ATTR(extack, attr);
e5009240 6510 return PTR_ERR(obj);
36dd1bcc
PNA		 6511 }
6512 if (obj->use > 0) {
6513 NL_SET_BAD_ATTR(extack, attr);
e5009240 6514 return -EBUSY;
36dd1bcc 6515 }
e5009240 6516
98319cb9 6517 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240
PNA		 6518
6519 return nft_delobj(&ctx, obj);
6520}
6521
d152159b 6522void nft_obj_notify(struct net *net, const struct nft_table *table,
25e94a99
PNA		 6523 struct nft_object *obj, u32 portid, u32 seq, int event,
6524 int family, int report, gfp_t gfp)
e5009240
PNA		 6525{
6526 struct sk_buff *skb;
6527 int err;
14224039 6528 char *buf = kasprintf(gfp, "%s:%llu;?:0",
8e6cf365
RGB		 6529 table->name, table->handle);
6530
6531 audit_log_nfcfg(buf,
6532 family,
6533 obj->handle,
6534 event == NFT_MSG_NEWOBJ ?
6535 AUDIT_NFT_OP_OBJ_REGISTER :
14224039 6536 AUDIT_NFT_OP_OBJ_UNREGISTER,
68df2ed5 6537 gfp);
8e6cf365 6538 kfree(buf);
e5009240 6539
2599e989
PNA		 6540 if (!report &&
6541 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 6542 return;
e5009240 6543
2599e989 6544 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 6545 if (skb == NULL)
6546 goto err;
6547
2599e989
PNA		 6548 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6549 table, obj, false);
e5009240
PNA		 6550 if (err < 0) {
6551 kfree_skb(skb);
6552 goto err;
6553 }
6554
67cc570e 6555 nft_notify_enqueue(skb, report, &net->nft.notify_list);
25e94a99 6556 return;
e5009240 6557err:
25e94a99 6558 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 6559}
2599e989
PNA		 6560EXPORT_SYMBOL_GPL(nft_obj_notify);
6561
25e94a99
PNA		 6562static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6563 struct nft_object *obj, int event)
2599e989 6564{
25e94a99 6565 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
36596dad 6566 ctx->family, ctx->report, GFP_KERNEL);
2599e989 6567}
e5009240 6568
3b49e2e9
PNA		 6569/*
6570 * Flow tables
6571 */
6572void nft_register_flowtable_type(struct nf_flowtable_type *type)
6573{
6574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6575 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6576 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6577}
6578EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6579
6580void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6581{
6582 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6583 list_del_rcu(&type->list);
6584 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6585}
6586EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6587
6588static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6589 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6590 .len = NFT_NAME_MAXLEN - 1 },
6591 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6592 .len = NFT_NAME_MAXLEN - 1 },
6593 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 6594 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8bb69f3b 6595 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
3b49e2e9
PNA		 6596};
6597
cac20fcd
PNA		 6598struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6599 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 6600{
6601 struct nft_flowtable *flowtable;
6602
d9adf22a 6603 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 6604 if (!nla_strcmp(nla, flowtable->name) &&
6605 nft_active_genmask(flowtable, genmask))
6606 return flowtable;
6607 }
6608 return ERR_PTR(-ENOENT);
6609}
cac20fcd 6610EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 6611
9b05b6e1
LGL		 6612void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6613 struct nft_flowtable *flowtable,
6614 enum nft_trans_phase phase)
6615{
6616 switch (phase) {
6617 case NFT_TRANS_PREPARE:
6618 case NFT_TRANS_ABORT:
6619 case NFT_TRANS_RELEASE:
6620 flowtable->use--;
954d8297 6621 fallthrough;
9b05b6e1
LGL		 6622 default:
6623 return;
6624 }
6625}
6626EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6627
ae0662f8 6628static struct nft_flowtable *
cac20fcd
PNA		 6629nft_flowtable_lookup_byhandle(const struct nft_table *table,
6630 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 6631{
6632 struct nft_flowtable *flowtable;
6633
6634 list_for_each_entry(flowtable, &table->flowtables, list) {
6635 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6636 nft_active_genmask(flowtable, genmask))
6637 return flowtable;
6638 }
6639 return ERR_PTR(-ENOENT);
6640}
6641
d9246a53
PNA		 6642struct nft_flowtable_hook {
6643 u32 num;
6644 int priority;
6645 struct list_head list;
6646};
6647
3b49e2e9
PNA		 6648static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6649 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6650 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6651 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6652};
6653
d9246a53
PNA		 6654static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6655 const struct nlattr *attr,
6656 struct nft_flowtable_hook *flowtable_hook,
5b6743fb 6657 struct nft_flowtable *flowtable, bool add)
3b49e2e9 6658{
3b49e2e9 6659 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
3f0465a9 6660 struct nft_hook *hook;
3b49e2e9 6661 int hooknum, priority;
3f0465a9 6662 int err;
3b49e2e9 6663
d9246a53
PNA		 6664 INIT_LIST_HEAD(&flowtable_hook->list);
6665
8cb08174
JB		 6666 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6667 nft_flowtable_hook_policy, NULL);
3b49e2e9
PNA		 6668 if (err < 0)
6669 return err;
6670
5b6743fb
PNA		 6671 if (add) {
6672 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6673 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6674 return -EINVAL;
3b49e2e9 6675
5b6743fb
PNA		 6676 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6677 if (hooknum != NF_NETDEV_INGRESS)
6678 return -EOPNOTSUPP;
6679
6680 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6681
6682 flowtable_hook->priority = priority;
6683 flowtable_hook->num = hooknum;
6684 } else {
6685 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6686 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6687 if (hooknum != flowtable->hooknum)
6688 return -EOPNOTSUPP;
6689 }
6690
6691 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6692 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6693 if (priority != flowtable->data.priority)
6694 return -EOPNOTSUPP;
6695 }
3b49e2e9 6696
5b6743fb
PNA		 6697 flowtable_hook->priority = flowtable->data.priority;
6698 flowtable_hook->num = flowtable->hooknum;
6699 }
3b49e2e9 6700
05abe445
PNA		 6701 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6702 err = nf_tables_parse_netdev_hooks(ctx->net,
6703 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6704 &flowtable_hook->list);
6705 if (err < 0)
6706 return err;
6707 }
3b49e2e9 6708
d9246a53 6709 list_for_each_entry(hook, &flowtable_hook->list, list) {
3f0465a9 6710 hook->ops.pf = NFPROTO_NETDEV;
5b6743fb
PNA		 6711 hook->ops.hooknum = flowtable_hook->num;
6712 hook->ops.priority = flowtable_hook->priority;
6713 hook->ops.priv = &flowtable->data;
6714 hook->ops.hook = flowtable->data.type->hook;
3b49e2e9
PNA		 6715 }
6716
3b49e2e9
PNA		 6717 return err;
6718}
6719
98319cb9 6720static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 6721{
6722 const struct nf_flowtable_type *type;
6723
6724 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 6725 if (family == type->family)
3b49e2e9
PNA		 6726 return type;
6727 }
6728 return NULL;
6729}
6730
452238e8
FW		 6731static const struct nf_flowtable_type *
6732nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 6733{
6734 const struct nf_flowtable_type *type;
6735
98319cb9 6736 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 6737 if (type != NULL && try_module_get(type->owner))
6738 return type;
6739
f102d66b 6740 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 6741#ifdef CONFIG_MODULES
6742 if (type == NULL) {
eb014de4 6743 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
3b49e2e9
PNA		 6744 return ERR_PTR(-EAGAIN);
6745 }
6746#endif
6747 return ERR_PTR(-ENOENT);
6748}
6749
5acab914 6750/* Only called from error and netdev event paths. */
ff4bf2f4
PNA		 6751static void nft_unregister_flowtable_hook(struct net *net,
6752 struct nft_flowtable *flowtable,
6753 struct nft_hook *hook)
6754{
6755 nf_unregister_net_hook(net, &hook->ops);
6756 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6757 FLOW_BLOCK_UNBIND);
6758}
6759
3b49e2e9 6760static void nft_unregister_flowtable_net_hooks(struct net *net,
f9382669 6761 struct list_head *hook_list)
3b49e2e9 6762{
3f0465a9 6763 struct nft_hook *hook;
3b49e2e9 6764
f9382669 6765 list_for_each_entry(hook, hook_list, list)
5acab914 6766 nf_unregister_net_hook(net, &hook->ops);
3f0465a9
PNA		 6767}
6768
6769static int nft_register_flowtable_net_hooks(struct net *net,
6770 struct nft_table *table,
f9382669 6771 struct list_head *hook_list,
3f0465a9
PNA		 6772 struct nft_flowtable *flowtable)
6773{
6774 struct nft_hook *hook, *hook2, *next;
6775 struct nft_flowtable *ft;
6776 int err, i = 0;
6777
f9382669 6778 list_for_each_entry(hook, hook_list, list) {
3f0465a9
PNA		 6779 list_for_each_entry(ft, &table->flowtables, list) {
6780 list_for_each_entry(hook2, &ft->hook_list, list) {
6781 if (hook->ops.dev == hook2->ops.dev &&
6782 hook->ops.pf == hook2->ops.pf) {
77a92189 6783 err = -EEXIST;
3f0465a9
PNA		 6784 goto err_unregister_net_hooks;
6785 }
6786 }
6787 }
3b49e2e9 6788
d7c03a9f 6789 err = flowtable->data.type->setup(&flowtable->data,
6790 hook->ops.dev,
6791 FLOW_BLOCK_BIND);
3f0465a9
PNA		 6792 if (err < 0)
6793 goto err_unregister_net_hooks;
6794
d7c03a9f 6795 err = nf_register_net_hook(net, &hook->ops);
6796 if (err < 0) {
6797 flowtable->data.type->setup(&flowtable->data,
6798 hook->ops.dev,
6799 FLOW_BLOCK_UNBIND);
6800 goto err_unregister_net_hooks;
6801 }
6802
3f0465a9 6803 i++;
3b49e2e9 6804 }
3f0465a9
PNA		 6805
6806 return 0;
6807
6808err_unregister_net_hooks:
f9382669 6809 list_for_each_entry_safe(hook, next, hook_list, list) {
3f0465a9
PNA		 6810 if (i-- <= 0)
6811 break;
6812
ff4bf2f4 6813 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 6814 list_del_rcu(&hook->list);
6815 kfree_rcu(hook, rcu);
6816 }
6817
6818 return err;
3b49e2e9
PNA		 6819}
6820
389a2cbc
PNA		 6821static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6822{
6823 struct nft_hook *hook, *next;
6824
6825 list_for_each_entry_safe(hook, next, hook_list, list) {
6826 list_del_rcu(&hook->list);
6827 kfree_rcu(hook, rcu);
6828 }
6829}
6830
78d9f48f
PNA		 6831static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6832 struct nft_flowtable *flowtable)
6833{
6834 const struct nlattr * const *nla = ctx->nla;
6835 struct nft_flowtable_hook flowtable_hook;
6836 struct nft_hook *hook, *next;
6837 struct nft_trans *trans;
6838 bool unregister = false;
6839 int err;
6840
6841 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 6842 &flowtable_hook, flowtable, false);
78d9f48f
PNA		 6843 if (err < 0)
6844 return err;
6845
6846 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6847 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6848 list_del(&hook->list);
6849 kfree(hook);
6850 }
6851 }
6852
6853 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6854 &flowtable_hook.list, flowtable);
6855 if (err < 0)
6856 goto err_flowtable_update_hook;
6857
6858 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6859 sizeof(struct nft_trans_flowtable));
6860 if (!trans) {
6861 unregister = true;
6862 err = -ENOMEM;
6863 goto err_flowtable_update_hook;
6864 }
6865
6866 nft_trans_flowtable(trans) = flowtable;
6867 nft_trans_flowtable_update(trans) = true;
6868 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6869 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6870
6871 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6872
6873 return 0;
6874
6875err_flowtable_update_hook:
6876 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6877 if (unregister)
6878 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6879 list_del_rcu(&hook->list);
6880 kfree_rcu(hook, rcu);
6881 }
6882
6883 return err;
6884
6885}
6886
3b49e2e9
PNA		 6887static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6888 struct sk_buff *skb,
6889 const struct nlmsghdr *nlh,
6890 const struct nlattr * const nla[],
6891 struct netlink_ext_ack *extack)
6892{
6893 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
d9246a53 6894 struct nft_flowtable_hook flowtable_hook;
3b49e2e9
PNA		 6895 const struct nf_flowtable_type *type;
6896 u8 genmask = nft_genmask_next(net);
6897 int family = nfmsg->nfgen_family;
3f0465a9
PNA		 6898 struct nft_flowtable *flowtable;
6899 struct nft_hook *hook, *next;
3b49e2e9
PNA		 6900 struct nft_table *table;
6901 struct nft_ctx ctx;
3f0465a9 6902 int err;
3b49e2e9
PNA		 6903
6904 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6905 !nla[NFTA_FLOWTABLE_NAME] ||
6906 !nla[NFTA_FLOWTABLE_HOOK])
6907 return -EINVAL;
6908
cac20fcd 6909 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 6910 genmask, NETLINK_CB(skb).portid);
36dd1bcc
PNA		 6911 if (IS_ERR(table)) {
6912 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 6913 return PTR_ERR(table);
36dd1bcc 6914 }
3b49e2e9 6915
cac20fcd
PNA		 6916 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6917 genmask);
3b49e2e9
PNA		 6918 if (IS_ERR(flowtable)) {
6919 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 6920 if (err != -ENOENT) {
6921 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 6922 return err;
36dd1bcc 6923 }
3b49e2e9 6924 } else {
36dd1bcc
PNA		 6925 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6926 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 6927 return -EEXIST;
36dd1bcc 6928 }
3b49e2e9 6929
78d9f48f
PNA		 6930 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6931
6932 return nft_flowtable_update(&ctx, nlh, flowtable);
3b49e2e9
PNA		 6933 }
6934
98319cb9 6935 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 6936
6937 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6938 if (!flowtable)
6939 return -ENOMEM;
6940
6941 flowtable->table = table;
3ecbfd65 6942 flowtable->handle = nf_tables_alloc_handle(table);
3f0465a9 6943 INIT_LIST_HEAD(&flowtable->hook_list);
3ecbfd65 6944
3b49e2e9
PNA		 6945 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6946 if (!flowtable->name) {
6947 err = -ENOMEM;
6948 goto err1;
6949 }
6950
452238e8 6951 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 6952 if (IS_ERR(type)) {
6953 err = PTR_ERR(type);
6954 goto err2;
6955 }
6956
8bb69f3b
PNA		 6957 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6958 flowtable->data.flags =
6959 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
cfbd1125 6960 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
8bb69f3b
PNA		 6961 goto err3;
6962 }
6963
6964 write_pnet(&flowtable->data.net, net);
3b49e2e9 6965 flowtable->data.type = type;
a268de77 6966 err = type->init(&flowtable->data);
3b49e2e9
PNA		 6967 if (err < 0)
6968 goto err3;
6969
d9246a53 6970 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 6971 &flowtable_hook, flowtable, true);
3b49e2e9 6972 if (err < 0)
a268de77 6973 goto err4;
3b49e2e9 6974
d9246a53
PNA		 6975 list_splice(&flowtable_hook.list, &flowtable->hook_list);
6976 flowtable->data.priority = flowtable_hook.priority;
6977 flowtable->hooknum = flowtable_hook.num;
6978
f9382669
PNA		 6979 err = nft_register_flowtable_net_hooks(ctx.net, table,
6980 &flowtable->hook_list,
6981 flowtable);
2d285f26 6982 if (err < 0) {
389a2cbc 6983 nft_flowtable_hooks_destroy(&flowtable->hook_list);
3f0465a9 6984 goto err4;
2d285f26 6985 }
3b49e2e9
PNA		 6986
6987 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6988 if (err < 0)
3f0465a9 6989 goto err5;
3b49e2e9
PNA		 6990
6991 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6992 table->use++;
6993
6994 return 0;
a268de77 6995err5:
3f0465a9 6996 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
ff4bf2f4 6997 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 6998 list_del_rcu(&hook->list);
6999 kfree_rcu(hook, rcu);
7000 }
a268de77
FF		 7001err4:
7002 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 7003err3:
7004 module_put(type->owner);
7005err2:
7006 kfree(flowtable->name);
7007err1:
7008 kfree(flowtable);
7009 return err;
7010}
7011
3003055f
PNA		 7012static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7013{
7014 struct nft_hook *this, *next;
7015
7016 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7017 list_del(&this->list);
7018 kfree(this);
7019 }
7020}
7021
abadb2f8
PNA		 7022static int nft_delflowtable_hook(struct nft_ctx *ctx,
7023 struct nft_flowtable *flowtable)
7024{
7025 const struct nlattr * const *nla = ctx->nla;
7026 struct nft_flowtable_hook flowtable_hook;
3003055f 7027 struct nft_hook *this, *hook;
abadb2f8
PNA		 7028 struct nft_trans *trans;
7029 int err;
7030
7031 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 7032 &flowtable_hook, flowtable, false);
abadb2f8
PNA		 7033 if (err < 0)
7034 return err;
7035
3003055f 7036 list_for_each_entry(this, &flowtable_hook.list, list) {
abadb2f8
PNA		 7037 hook = nft_hook_list_find(&flowtable->hook_list, this);
7038 if (!hook) {
7039 err = -ENOENT;
7040 goto err_flowtable_del_hook;
7041 }
7042 hook->inactive = true;
abadb2f8
PNA		 7043 }
7044
7045 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7046 sizeof(struct nft_trans_flowtable));
3003055f
PNA		 7047 if (!trans) {
7048 err = -ENOMEM;
7049 goto err_flowtable_del_hook;
7050 }
abadb2f8
PNA		 7051
7052 nft_trans_flowtable(trans) = flowtable;
7053 nft_trans_flowtable_update(trans) = true;
7054 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
3003055f 7055 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8
PNA		 7056
7057 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7058
7059 return 0;
7060
7061err_flowtable_del_hook:
3003055f
PNA		 7062 list_for_each_entry(this, &flowtable_hook.list, list) {
7063 hook = nft_hook_list_find(&flowtable->hook_list, this);
7064 if (!hook)
7065 break;
7066
abadb2f8 7067 hook->inactive = false;
3003055f
PNA		 7068 }
7069 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8
PNA		 7070
7071 return err;
7072}
7073
3b49e2e9
PNA		 7074static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7075 struct sk_buff *skb,
7076 const struct nlmsghdr *nlh,
7077 const struct nlattr * const nla[],
7078 struct netlink_ext_ack *extack)
7079{
7080 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7081 u8 genmask = nft_genmask_next(net);
7082 int family = nfmsg->nfgen_family;
7083 struct nft_flowtable *flowtable;
36dd1bcc 7084 const struct nlattr *attr;
3b49e2e9
PNA		 7085 struct nft_table *table;
7086 struct nft_ctx ctx;
7087
e603ea4b
PNA		 7088 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7089 (!nla[NFTA_FLOWTABLE_NAME] &&
7090 !nla[NFTA_FLOWTABLE_HANDLE]))
7091 return -EINVAL;
7092
cac20fcd 7093 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 7094 genmask, NETLINK_CB(skb).portid);
36dd1bcc
PNA		 7095 if (IS_ERR(table)) {
7096 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 7097 return PTR_ERR(table);
36dd1bcc 7098 }
3b49e2e9 7099
36dd1bcc
PNA		 7100 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7101 attr = nla[NFTA_FLOWTABLE_HANDLE];
7102 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7103 } else {
7104 attr = nla[NFTA_FLOWTABLE_NAME];
7105 flowtable = nft_flowtable_lookup(table, attr, genmask);
7106 }
7107
7108 if (IS_ERR(flowtable)) {
7109 NL_SET_BAD_ATTR(extack, attr);
7110 return PTR_ERR(flowtable);
7111 }
abadb2f8
PNA		 7112
7113 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7114
7115 if (nla[NFTA_FLOWTABLE_HOOK])
7116 return nft_delflowtable_hook(&ctx, flowtable);
7117
36dd1bcc
PNA		 7118 if (flowtable->use > 0) {
7119 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 7120 return -EBUSY;
36dd1bcc 7121 }
3b49e2e9 7122
3b49e2e9
PNA		 7123 return nft_delflowtable(&ctx, flowtable);
7124}
7125
7126static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7127 u32 portid, u32 seq, int event,
7128 u32 flags, int family,
c42d8bda
PNA		 7129 struct nft_flowtable *flowtable,
7130 struct list_head *hook_list)
3b49e2e9
PNA		 7131{
7132 struct nlattr *nest, *nest_devs;
7133 struct nfgenmsg *nfmsg;
3f0465a9 7134 struct nft_hook *hook;
3b49e2e9 7135 struct nlmsghdr *nlh;
3b49e2e9
PNA		 7136
7137 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7138 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7139 if (nlh == NULL)
7140 goto nla_put_failure;
7141
7142 nfmsg = nlmsg_data(nlh);
7143 nfmsg->nfgen_family = family;
7144 nfmsg->version = NFNETLINK_V0;
7145 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7146
7147 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7148 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 7149 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7150 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8bb69f3b
PNA		 7151 NFTA_FLOWTABLE_PAD) ||
7152 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
3b49e2e9
PNA		 7153 goto nla_put_failure;
7154
ae0be8de 7155 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
eb895086
KL		 7156 if (!nest)
7157 goto nla_put_failure;
3b49e2e9 7158 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
71a8a63b 7159 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
3b49e2e9
PNA		 7160 goto nla_put_failure;
7161
ae0be8de 7162 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
3b49e2e9
PNA		 7163 if (!nest_devs)
7164 goto nla_put_failure;
7165
c42d8bda 7166 list_for_each_entry_rcu(hook, hook_list, list) {
3f0465a9 7167 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
3b49e2e9
PNA		 7168 goto nla_put_failure;
7169 }
7170 nla_nest_end(skb, nest_devs);
7171 nla_nest_end(skb, nest);
7172
7173 nlmsg_end(skb, nlh);
7174 return 0;
7175
7176nla_put_failure:
7177 nlmsg_trim(skb, nlh);
7178 return -1;
7179}
7180
7181struct nft_flowtable_filter {
7182 char *table;
7183};
7184
7185static int nf_tables_dump_flowtable(struct sk_buff *skb,
7186 struct netlink_callback *cb)
7187{
7188 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7189 struct nft_flowtable_filter *filter = cb->data;
7190 unsigned int idx = 0, s_idx = cb->args[0];
7191 struct net *net = sock_net(skb->sk);
7192 int family = nfmsg->nfgen_family;
7193 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 7194 const struct nft_table *table;
7195
7196 rcu_read_lock();
7197 cb->seq = net->nft.base_seq;
7198
36596dad 7199 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 7200 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 7201 continue;
7202
36596dad
PNA		 7203 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7204 if (!nft_is_active(net, flowtable))
7205 goto cont;
7206 if (idx < s_idx)
7207 goto cont;
7208 if (idx > s_idx)
7209 memset(&cb->args[1], 0,
7210 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 7211 if (filter && filter->table &&
36596dad
PNA		 7212 strcmp(filter->table, table->name))
7213 goto cont;
3b49e2e9 7214
36596dad
PNA		 7215 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7216 cb->nlh->nlmsg_seq,
7217 NFT_MSG_NEWFLOWTABLE,
7218 NLM_F_MULTI | NLM_F_APPEND,
c42d8bda
PNA		 7219 table->family,
7220 flowtable,
7221 &flowtable->hook_list) < 0)
36596dad 7222 goto done;
3b49e2e9 7223
36596dad 7224 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 7225cont:
36596dad 7226 idx++;
3b49e2e9
PNA		 7227 }
7228 }
7229done:
7230 rcu_read_unlock();
7231
7232 cb->args[0] = idx;
7233 return skb->len;
7234}
7235
90fd131a 7236static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 7237{
90fd131a
FW		 7238 const struct nlattr * const *nla = cb->data;
7239 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 7240
90fd131a
FW		 7241 if (nla[NFTA_FLOWTABLE_TABLE]) {
7242 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7243 if (!filter)
7244 return -ENOMEM;
3b49e2e9 7245
90fd131a
FW		 7246 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7247 GFP_ATOMIC);
7248 if (!filter->table) {
7249 kfree(filter);
7250 return -ENOMEM;
7251 }
7252 }
3b49e2e9 7253
90fd131a 7254 cb->data = filter;
3b49e2e9
PNA		 7255 return 0;
7256}
7257
90fd131a 7258static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 7259{
90fd131a 7260 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 7261
3b49e2e9 7262 if (!filter)
90fd131a 7263 return 0;
3b49e2e9 7264
90fd131a
FW		 7265 kfree(filter->table);
7266 kfree(filter);
7267
7268 return 0;
3b49e2e9
PNA		 7269}
7270
d9adf22a 7271/* called with rcu_read_lock held */
3b49e2e9
PNA		 7272static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7273 struct sk_buff *skb,
7274 const struct nlmsghdr *nlh,
7275 const struct nlattr * const nla[],
7276 struct netlink_ext_ack *extack)
7277{
7278 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7279 u8 genmask = nft_genmask_cur(net);
7280 int family = nfmsg->nfgen_family;
7281 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 7282 const struct nft_table *table;
7283 struct sk_buff *skb2;
7284 int err;
7285
7286 if (nlh->nlmsg_flags & NLM_F_DUMP) {
7287 struct netlink_dump_control c = {
90fd131a 7288 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 7289 .dump = nf_tables_dump_flowtable,
7290 .done = nf_tables_dump_flowtable_done,
d9adf22a 7291 .module = THIS_MODULE,
90fd131a 7292 .data = (void *)nla,
3b49e2e9
PNA		 7293 };
7294
d9adf22a 7295 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3b49e2e9
PNA		 7296 }
7297
7298 if (!nla[NFTA_FLOWTABLE_NAME])
7299 return -EINVAL;
7300
cac20fcd 7301 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6001a930 7302 genmask, 0);
3b49e2e9
PNA		 7303 if (IS_ERR(table))
7304 return PTR_ERR(table);
7305
cac20fcd
PNA		 7306 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7307 genmask);
03a0120f 7308 if (IS_ERR(flowtable))
3b49e2e9
PNA		 7309 return PTR_ERR(flowtable);
7310
d9adf22a 7311 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 7312 if (!skb2)
7313 return -ENOMEM;
7314
7315 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7316 nlh->nlmsg_seq,
7317 NFT_MSG_NEWFLOWTABLE, 0, family,
c42d8bda 7318 flowtable, &flowtable->hook_list);
3b49e2e9 7319 if (err < 0)
ee921183 7320 goto err_fill_flowtable_info;
3b49e2e9 7321
ee921183
PNA		 7322 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7323
7324err_fill_flowtable_info:
3b49e2e9
PNA		 7325 kfree_skb(skb2);
7326 return err;
7327}
7328
7329static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7330 struct nft_flowtable *flowtable,
c42d8bda 7331 struct list_head *hook_list,
3b49e2e9
PNA		 7332 int event)
7333{
7334 struct sk_buff *skb;
7335 int err;
8e6cf365
RGB		 7336 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7337 flowtable->table->name, flowtable->table->handle,
7338 flowtable->name, flowtable->handle);
7339
7340 audit_log_nfcfg(buf,
7341 ctx->family,
7342 flowtable->hooknum,
7343 event == NFT_MSG_NEWFLOWTABLE ?
7344 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
14224039
RGB		 7345 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7346 GFP_KERNEL);
8e6cf365 7347 kfree(buf);
3b49e2e9 7348
dceababa 7349 if (!ctx->report &&
3b49e2e9
PNA		 7350 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7351 return;
7352
7353 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7354 if (skb == NULL)
7355 goto err;
7356
7357 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7358 ctx->seq, event, 0,
c42d8bda 7359 ctx->family, flowtable, hook_list);
3b49e2e9
PNA		 7360 if (err < 0) {
7361 kfree_skb(skb);
7362 goto err;
7363 }
7364
67cc570e 7365 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3b49e2e9
PNA		 7366 return;
7367err:
7368 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7369}
7370
3b49e2e9
PNA		 7371static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7372{
3f0465a9
PNA		 7373 struct nft_hook *hook, *next;
7374
5acab914 7375 flowtable->data.type->free(&flowtable->data);
3f0465a9 7376 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
5acab914
PNA		 7377 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7378 FLOW_BLOCK_UNBIND);
3f0465a9
PNA		 7379 list_del_rcu(&hook->list);
7380 kfree(hook);
7381 }
3b49e2e9 7382 kfree(flowtable->name);
3b49e2e9 7383 module_put(flowtable->data.type->owner);
a12486eb 7384 kfree(flowtable);
3b49e2e9
PNA		 7385}
7386
84d7fce6
PNA		 7387static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7388 u32 portid, u32 seq)
7389{
7390 struct nlmsghdr *nlh;
7391 struct nfgenmsg *nfmsg;
784b4e61 7392 char buf[TASK_COMM_LEN];
dedb67c4 7393 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 7394
7395 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7396 if (nlh == NULL)
7397 goto nla_put_failure;
7398
7399 nfmsg = nlmsg_data(nlh);
7400 nfmsg->nfgen_family = AF_UNSPEC;
7401 nfmsg->version = NFNETLINK_V0;
7402 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7403
784b4e61
PS		 7404 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7405 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7406 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 7407 goto nla_put_failure;
7408
053c095a
JB		 7409 nlmsg_end(skb, nlh);
7410 return 0;
84d7fce6
PNA		 7411
7412nla_put_failure:
7413 nlmsg_trim(skb, nlh);
7414 return -EMSGSIZE;
7415}
7416
3b49e2e9
PNA		 7417static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7418 struct nft_flowtable *flowtable)
7419{
3f0465a9 7420 struct nft_hook *hook;
3b49e2e9 7421
3f0465a9
PNA		 7422 list_for_each_entry(hook, &flowtable->hook_list, list) {
7423 if (hook->ops.dev != dev)
3b49e2e9
PNA		 7424 continue;
7425
5acab914 7426 /* flow_offload_netdev_event() cleans up entries for us. */
ff4bf2f4 7427 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
3f0465a9
PNA		 7428 list_del_rcu(&hook->list);
7429 kfree_rcu(hook, rcu);
3b49e2e9
PNA		 7430 break;
7431 }
7432}
7433
7434static int nf_tables_flowtable_event(struct notifier_block *this,
7435 unsigned long event, void *ptr)
7436{
7437 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7438 struct nft_flowtable *flowtable;
7439 struct nft_table *table;
0a2cf5ee 7440 struct net *net;
3b49e2e9
PNA		 7441
7442 if (event != NETDEV_UNREGISTER)
7443 return 0;
7444
6a48de01 7445 net = dev_net(dev);
9e619d87 7446 mutex_lock(&net->nft.commit_mutex);
0a2cf5ee 7447 list_for_each_entry(table, &net->nft.tables, list) {
36596dad
PNA		 7448 list_for_each_entry(flowtable, &table->flowtables, list) {
7449 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 7450 }
7451 }
9e619d87 7452 mutex_unlock(&net->nft.commit_mutex);
6a48de01 7453
3b49e2e9
PNA		 7454 return NOTIFY_DONE;
7455}
7456
7457static struct notifier_block nf_tables_flowtable_notifier = {
7458 .notifier_call = nf_tables_flowtable_event,
7459};
7460
25e94a99
PNA		 7461static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7462 int event)
84d7fce6
PNA		 7463{
7464 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7465 struct sk_buff *skb2;
7466 int err;
7467
8e6cf365 7468 audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
14224039 7469 AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
8e6cf365 7470
dceababa 7471 if (!nlmsg_report(nlh) &&
84d7fce6 7472 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 7473 return;
84d7fce6 7474
84d7fce6
PNA		 7475 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7476 if (skb2 == NULL)
7477 goto err;
7478
7479 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7480 nlh->nlmsg_seq);
7481 if (err < 0) {
7482 kfree_skb(skb2);
7483 goto err;
7484 }
7485
25e94a99
PNA		 7486 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7487 nlmsg_report(nlh), GFP_KERNEL);
7488 return;
84d7fce6 7489err:
25e94a99
PNA		 7490 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7491 -ENOBUFS);
84d7fce6
PNA		 7492}
7493
7b8002a1
PNA		 7494static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7495 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 7496 const struct nlattr * const nla[],
7497 struct netlink_ext_ack *extack)
84d7fce6 7498{
84d7fce6
PNA		 7499 struct sk_buff *skb2;
7500 int err;
7501
d9adf22a 7502 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 7503 if (skb2 == NULL)
7504 return -ENOMEM;
7505
7506 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7507 nlh->nlmsg_seq);
7508 if (err < 0)
ee921183 7509 goto err_fill_gen_info;
84d7fce6 7510
ee921183
PNA		 7511 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7512
7513err_fill_gen_info:
84d7fce6
PNA		 7514 kfree_skb(skb2);
7515 return err;
7516}
7517
96518518
PM		 7518static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7519 [NFT_MSG_NEWTABLE] = {
55dd6f93 7520 .call_batch = nf_tables_newtable,
96518518
PM		 7521 .attr_count = NFTA_TABLE_MAX,
7522 .policy = nft_table_policy,
7523 },
7524 [NFT_MSG_GETTABLE] = {
d9adf22a 7525 .call_rcu = nf_tables_gettable,
96518518
PM		 7526 .attr_count = NFTA_TABLE_MAX,
7527 .policy = nft_table_policy,
7528 },
7529 [NFT_MSG_DELTABLE] = {
55dd6f93 7530 .call_batch = nf_tables_deltable,
96518518
PM		 7531 .attr_count = NFTA_TABLE_MAX,
7532 .policy = nft_table_policy,
7533 },
7534 [NFT_MSG_NEWCHAIN] = {
91c7b38d 7535 .call_batch = nf_tables_newchain,
96518518
PM		 7536 .attr_count = NFTA_CHAIN_MAX,
7537 .policy = nft_chain_policy,
7538 },
7539 [NFT_MSG_GETCHAIN] = {
d9adf22a 7540 .call_rcu = nf_tables_getchain,
96518518
PM		 7541 .attr_count = NFTA_CHAIN_MAX,
7542 .policy = nft_chain_policy,
7543 },
7544 [NFT_MSG_DELCHAIN] = {
91c7b38d 7545 .call_batch = nf_tables_delchain,
96518518
PM		 7546 .attr_count = NFTA_CHAIN_MAX,
7547 .policy = nft_chain_policy,
7548 },
7549 [NFT_MSG_NEWRULE] = {
0628b123 7550 .call_batch = nf_tables_newrule,
96518518
PM		 7551 .attr_count = NFTA_RULE_MAX,
7552 .policy = nft_rule_policy,
7553 },
7554 [NFT_MSG_GETRULE] = {
d9adf22a 7555 .call_rcu = nf_tables_getrule,
96518518
PM		 7556 .attr_count = NFTA_RULE_MAX,
7557 .policy = nft_rule_policy,
7558 },
7559 [NFT_MSG_DELRULE] = {
0628b123 7560 .call_batch = nf_tables_delrule,
96518518
PM		 7561 .attr_count = NFTA_RULE_MAX,
7562 .policy = nft_rule_policy,
7563 },
20a69341 7564 [NFT_MSG_NEWSET] = {
958bee14 7565 .call_batch = nf_tables_newset,
20a69341
PM		 7566 .attr_count = NFTA_SET_MAX,
7567 .policy = nft_set_policy,
7568 },
7569 [NFT_MSG_GETSET] = {
d9adf22a 7570 .call_rcu = nf_tables_getset,
20a69341
PM		 7571 .attr_count = NFTA_SET_MAX,
7572 .policy = nft_set_policy,
7573 },
7574 [NFT_MSG_DELSET] = {
958bee14 7575 .call_batch = nf_tables_delset,
20a69341
PM		 7576 .attr_count = NFTA_SET_MAX,
7577 .policy = nft_set_policy,
7578 },
7579 [NFT_MSG_NEWSETELEM] = {
958bee14 7580 .call_batch = nf_tables_newsetelem,
20a69341
PM		 7581 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7582 .policy = nft_set_elem_list_policy,
7583 },
7584 [NFT_MSG_GETSETELEM] = {
d9adf22a 7585 .call_rcu = nf_tables_getsetelem,
20a69341
PM		 7586 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7587 .policy = nft_set_elem_list_policy,
7588 },
7589 [NFT_MSG_DELSETELEM] = {
958bee14 7590 .call_batch = nf_tables_delsetelem,
20a69341
PM		 7591 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7592 .policy = nft_set_elem_list_policy,
7593 },
84d7fce6 7594 [NFT_MSG_GETGEN] = {
d9adf22a 7595 .call_rcu = nf_tables_getgen,
84d7fce6 7596 },
e5009240
PNA		 7597 [NFT_MSG_NEWOBJ] = {
7598 .call_batch = nf_tables_newobj,
7599 .attr_count = NFTA_OBJ_MAX,
7600 .policy = nft_obj_policy,
7601 },
7602 [NFT_MSG_GETOBJ] = {
d9adf22a 7603 .call_rcu = nf_tables_getobj,
e5009240
PNA		 7604 .attr_count = NFTA_OBJ_MAX,
7605 .policy = nft_obj_policy,
7606 },
7607 [NFT_MSG_DELOBJ] = {
7608 .call_batch = nf_tables_delobj,
7609 .attr_count = NFTA_OBJ_MAX,
7610 .policy = nft_obj_policy,
7611 },
43da04a5 7612 [NFT_MSG_GETOBJ_RESET] = {
d9adf22a 7613 .call_rcu = nf_tables_getobj,
43da04a5
PNA		 7614 .attr_count = NFTA_OBJ_MAX,
7615 .policy = nft_obj_policy,
7616 },
3b49e2e9
PNA		 7617 [NFT_MSG_NEWFLOWTABLE] = {
7618 .call_batch = nf_tables_newflowtable,
7619 .attr_count = NFTA_FLOWTABLE_MAX,
7620 .policy = nft_flowtable_policy,
7621 },
7622 [NFT_MSG_GETFLOWTABLE] = {
d9adf22a 7623 .call_rcu = nf_tables_getflowtable,
3b49e2e9
PNA		 7624 .attr_count = NFTA_FLOWTABLE_MAX,
7625 .policy = nft_flowtable_policy,
7626 },
7627 [NFT_MSG_DELFLOWTABLE] = {
7628 .call_batch = nf_tables_delflowtable,
7629 .attr_count = NFTA_FLOWTABLE_MAX,
7630 .policy = nft_flowtable_policy,
7631 },
96518518
PM		 7632};
7633
a654de8f
PNA		 7634static int nf_tables_validate(struct net *net)
7635{
7636 struct nft_table *table;
7637
7638 switch (net->nft.validate_state) {
7639 case NFT_VALIDATE_SKIP:
7640 break;
7641 case NFT_VALIDATE_NEED:
7642 nft_validate_state_update(net, NFT_VALIDATE_DO);
954d8297 7643 fallthrough;
a654de8f
PNA		 7644 case NFT_VALIDATE_DO:
7645 list_for_each_entry(table, &net->nft.tables, list) {
7646 if (nft_table_validate(net, table) < 0)
7647 return -EAGAIN;
7648 }
7649 break;
7650 }
7651
7652 return 0;
7653}
7654
66293c46
FW		 7655/* a drop policy has to be deferred until all rules have been activated,
7656 * otherwise a large ruleset that contains a drop-policy base chain will
7657 * cause all packets to get dropped until the full transaction has been
7658 * processed.
7659 *
7660 * We defer the drop policy until the transaction has been finalized.
7661 */
7662static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7663{
7664 struct nft_base_chain *basechain;
7665
7666 if (nft_trans_chain_policy(trans) != NF_DROP)
7667 return;
7668
7669 if (!nft_is_base_chain(trans->ctx.chain))
7670 return;
7671
7672 basechain = nft_base_chain(trans->ctx.chain);
7673 basechain->policy = NF_DROP;
7674}
7675
91c7b38d
PNA		 7676static void nft_chain_commit_update(struct nft_trans *trans)
7677{
7678 struct nft_base_chain *basechain;
7679
1b2470e5
FW		 7680 if (nft_trans_chain_name(trans)) {
7681 rhltable_remove(&trans->ctx.table->chains_ht,
7682 &trans->ctx.chain->rhlhead,
7683 nft_chain_ht_params);
d71efb59 7684 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 7685 rhltable_insert_key(&trans->ctx.table->chains_ht,
7686 trans->ctx.chain->name,
7687 &trans->ctx.chain->rhlhead,
7688 nft_chain_ht_params);
7689 }
91c7b38d 7690
f323d954 7691 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 7692 return;
7693
53315ac6
FW		 7694 nft_chain_stats_replace(trans);
7695
91c7b38d 7696 basechain = nft_base_chain(trans->ctx.chain);
91c7b38d
PNA		 7697
7698 switch (nft_trans_chain_policy(trans)) {
7699 case NF_DROP:
7700 case NF_ACCEPT:
7701 basechain->policy = nft_trans_chain_policy(trans);
7702 break;
7703 }
7704}
7705
d62d0ba9
FFM		 7706static void nft_obj_commit_update(struct nft_trans *trans)
7707{
7708 struct nft_object *newobj;
7709 struct nft_object *obj;
7710
7711 obj = nft_trans_obj(trans);
7712 newobj = nft_trans_obj_newobj(trans);
7713
9fedd894
FFM		 7714 if (obj->ops->update)
7715 obj->ops->update(obj, newobj);
d62d0ba9
FFM		 7716
7717 kfree(newobj);
7718}
7719
2f99aa31 7720static void nft_commit_release(struct nft_trans *trans)
c7c32e72 7721{
c7c32e72
PNA		 7722 switch (trans->msg_type) {
7723 case NFT_MSG_DELTABLE:
7724 nf_tables_table_destroy(&trans->ctx);
7725 break;
9f8aac0b 7726 case NFT_MSG_NEWCHAIN:
53315ac6 7727 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b
FW		 7728 kfree(nft_trans_chain_name(trans));
7729 break;
c7c32e72 7730 case NFT_MSG_DELCHAIN:
43a605f2 7731 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 7732 break;
7733 case NFT_MSG_DELRULE:
7734 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7735 break;
7736 case NFT_MSG_DELSET:
0c2a85ed 7737 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 7738 break;
61edafbb 7739 case NFT_MSG_DELSETELEM:
3453c927
PNA		 7740 nf_tables_set_elem_destroy(&trans->ctx,
7741 nft_trans_elem_set(trans),
59105446 7742 nft_trans_elem(trans).priv);
61edafbb 7743 break;
e5009240 7744 case NFT_MSG_DELOBJ:
00bfb320 7745 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 7746 break;
3b49e2e9 7747 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 7748 if (nft_trans_flowtable_update(trans))
7749 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7750 else
7751 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 7752 break;
c7c32e72 7753 }
0935d558
FW		 7754
7755 if (trans->put_net)
7756 put_net(trans->ctx.net);
7757
c7c32e72
PNA		 7758 kfree(trans);
7759}
7760
0935d558 7761static void nf_tables_trans_destroy_work(struct work_struct *w)
2f99aa31
FW		 7762{
7763 struct nft_trans *trans, *next;
0935d558
FW		 7764 LIST_HEAD(head);
7765
7766 spin_lock(&nf_tables_destroy_list_lock);
7767 list_splice_init(&nf_tables_destroy_list, &head);
7768 spin_unlock(&nf_tables_destroy_list_lock);
2f99aa31 7769
0935d558 7770 if (list_empty(&head))
2f99aa31
FW		 7771 return;
7772
7773 synchronize_rcu();
7774
0935d558 7775 list_for_each_entry_safe(trans, next, &head, list) {
2f99aa31
FW		 7776 list_del(&trans->list);
7777 nft_commit_release(trans);
7778 }
7779}
7780
ffe8923f
FW		 7781void nf_tables_trans_destroy_flush_work(void)
7782{
7783 flush_work(&trans_destroy_work);
7784}
7785EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7786
0cbc06b3
FW		 7787static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7788{
7789 struct nft_rule *rule;
7790 unsigned int alloc = 0;
7791 int i;
7792
7793 /* already handled or inactive chain? */
7794 if (chain->rules_next || !nft_is_active_next(net, chain))
7795 return 0;
7796
7797 rule = list_entry(&chain->rules, struct nft_rule, list);
7798 i = 0;
7799
7800 list_for_each_entry_continue(rule, &chain->rules, list) {
7801 if (nft_is_active_next(net, rule))
7802 alloc++;
7803 }
7804
7805 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7806 if (!chain->rules_next)
7807 return -ENOMEM;
7808
7809 list_for_each_entry_continue(rule, &chain->rules, list) {
7810 if (nft_is_active_next(net, rule))
7811 chain->rules_next[i++] = rule;
7812 }
7813
7814 chain->rules_next[i] = NULL;
7815 return 0;
7816}
7817
7818static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7819{
7820 struct nft_trans *trans, *next;
7821
7822 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7823 struct nft_chain *chain = trans->ctx.chain;
7824
7825 if (trans->msg_type == NFT_MSG_NEWRULE ||
7826 trans->msg_type == NFT_MSG_DELRULE) {
7827 kvfree(chain->rules_next);
7828 chain->rules_next = NULL;
7829 }
7830 }
7831}
7832
7833static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7834{
7835 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7836
7837 kvfree(o->start);
7838}
7839
7840static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7841{
7842 struct nft_rule **r = rules;
7843 struct nft_rules_old *old;
7844
7845 while (*r)
7846 r++;
7847
7848 r++; /* rcu_head is after end marker */
7849 old = (void *) r;
7850 old->start = rules;
7851
7852 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7853}
7854
0fb39bbe 7855static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
0cbc06b3
FW		 7856{
7857 struct nft_rule **g0, **g1;
7858 bool next_genbit;
7859
7860 next_genbit = nft_gencursor_next(net);
7861
7862 g0 = rcu_dereference_protected(chain->rules_gen_0,
f102d66b 7863 lockdep_commit_lock_is_held(net));
0cbc06b3 7864 g1 = rcu_dereference_protected(chain->rules_gen_1,
f102d66b 7865 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 7866
7867 /* No changes to this chain? */
7868 if (chain->rules_next == NULL) {
7869 /* chain had no change in last or next generation */
7870 if (g0 == g1)
7871 return;
7872 /*
7873 * chain had no change in this generation; make sure next
7874 * one uses same rules as current generation.
7875 */
7876 if (next_genbit) {
7877 rcu_assign_pointer(chain->rules_gen_1, g0);
7878 nf_tables_commit_chain_free_rules_old(g1);
7879 } else {
7880 rcu_assign_pointer(chain->rules_gen_0, g1);
7881 nf_tables_commit_chain_free_rules_old(g0);
7882 }
7883
7884 return;
7885 }
7886
7887 if (next_genbit)
7888 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7889 else
7890 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7891
7892 chain->rules_next = NULL;
7893
7894 if (g0 == g1)
7895 return;
7896
7897 if (next_genbit)
7898 nf_tables_commit_chain_free_rules_old(g1);
7899 else
7900 nf_tables_commit_chain_free_rules_old(g0);
7901}
7902
d152159b
FW		 7903static void nft_obj_del(struct nft_object *obj)
7904{
4d44175a 7905 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
d152159b
FW		 7906 list_del_rcu(&obj->list);
7907}
7908
d0e2c7de 7909void nft_chain_del(struct nft_chain *chain)
1b2470e5
FW		 7910{
7911 struct nft_table *table = chain->table;
7912
7913 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7914 nft_chain_ht_params));
7915 list_del_rcu(&chain->list);
7916}
7917
abadb2f8
PNA		 7918static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7919 struct list_head *hook_list)
7920{
7921 struct nft_hook *hook, *next;
7922
7923 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7924 if (hook->inactive)
7925 list_move(&hook->list, hook_list);
7926 }
7927}
7928
eb014de4
PNA		 7929static void nf_tables_module_autoload_cleanup(struct net *net)
7930{
7931 struct nft_module_request *req, *next;
7932
7933 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7934 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7935 WARN_ON_ONCE(!req->done);
7936 list_del(&req->list);
7937 kfree(req);
7938 }
7939}
7940
0935d558
FW		 7941static void nf_tables_commit_release(struct net *net)
7942{
7943 struct nft_trans *trans;
7944
7945 /* all side effects have to be made visible.
7946 * For example, if a chain named 'foo' has been deleted, a
7947 * new transaction must not find it anymore.
7948 *
7949 * Memory reclaim happens asynchronously from work queue
7950 * to prevent expensive synchronize_rcu() in commit phase.
7951 */
7952 if (list_empty(&net->nft.commit_list)) {
eb014de4 7953 nf_tables_module_autoload_cleanup(net);
0935d558
FW		 7954 mutex_unlock(&net->nft.commit_mutex);
7955 return;
7956 }
7957
7958 trans = list_last_entry(&net->nft.commit_list,
7959 struct nft_trans, list);
7960 get_net(trans->ctx.net);
7961 WARN_ON_ONCE(trans->put_net);
7962
7963 trans->put_net = true;
7964 spin_lock(&nf_tables_destroy_list_lock);
7965 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7966 spin_unlock(&nf_tables_destroy_list_lock);
7967
eb014de4 7968 nf_tables_module_autoload_cleanup(net);
0935d558 7969 schedule_work(&trans_destroy_work);
ffe8923f
FW		 7970
7971 mutex_unlock(&net->nft.commit_mutex);
0935d558
FW		 7972}
7973
67cc570e
PNA		 7974static void nft_commit_notify(struct net *net, u32 portid)
7975{
7976 struct sk_buff *batch_skb = NULL, *nskb, *skb;
7977 unsigned char *data;
7978 int len;
7979
7980 list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7981 if (!batch_skb) {
7982new_batch:
7983 batch_skb = skb;
7984 len = NLMSG_GOODSIZE - skb->len;
7985 list_del(&skb->list);
7986 continue;
7987 }
7988 len -= skb->len;
7989 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7990 data = skb_put(batch_skb, skb->len);
7991 memcpy(data, skb->data, skb->len);
7992 list_del(&skb->list);
7993 kfree_skb(skb);
7994 continue;
7995 }
7996 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7997 NFT_CB(batch_skb).report, GFP_KERNEL);
7998 goto new_batch;
7999 }
8000
8001 if (batch_skb) {
8002 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8003 NFT_CB(batch_skb).report, GFP_KERNEL);
8004 }
8005
8006 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8007}
8008
5913beaf 8009static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 8010{
37082f93 8011 struct nft_trans *trans, *next;
a3716e70 8012 struct nft_trans_elem *te;
0cbc06b3
FW		 8013 struct nft_chain *chain;
8014 struct nft_table *table;
c9626a2c 8015 int err;
37082f93 8016
b8b27498
FW		 8017 if (list_empty(&net->nft.commit_list)) {
8018 mutex_unlock(&net->nft.commit_mutex);
8019 return 0;
8020 }
8021
a654de8f
PNA		 8022 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8023 if (nf_tables_validate(net) < 0)
8024 return -EAGAIN;
8025
c9626a2c
PNA		 8026 err = nft_flow_rule_offload_commit(net);
8027 if (err < 0)
8028 return err;
8029
0cbc06b3
FW		 8030 /* 1. Allocate space for next generation rules_gen_X[] */
8031 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8032 int ret;
37082f93 8033
0cbc06b3
FW		 8034 if (trans->msg_type == NFT_MSG_NEWRULE ||
8035 trans->msg_type == NFT_MSG_DELRULE) {
8036 chain = trans->ctx.chain;
8037
8038 ret = nf_tables_commit_chain_prepare(net, chain);
8039 if (ret < 0) {
8040 nf_tables_commit_chain_prepare_cancel(net);
8041 return ret;
8042 }
8043 }
8044 }
37082f93 8045
0cbc06b3
FW		 8046 /* step 2. Make rules_gen_X visible to packet path */
8047 list_for_each_entry(table, &net->nft.tables, list) {
0fb39bbe
FW		 8048 list_for_each_entry(chain, &table->chains, list)
8049 nf_tables_commit_chain(net, chain);
0cbc06b3
FW		 8050 }
8051
8052 /*
8053 * Bump generation counter, invalidate any dump in progress.
8054 * Cannot fail after this point.
37082f93 8055 */
0cbc06b3
FW		 8056 while (++net->nft.base_seq == 0);
8057
8058 /* step 3. Start new generation, rules_gen_X now in use. */
8059 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 8060
8061 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 8062 switch (trans->msg_type) {
55dd6f93
PNA		 8063 case NFT_MSG_NEWTABLE:
8064 if (nft_trans_table_update(trans)) {
8065 if (!nft_trans_table_enable(trans)) {
664b0f8c 8066 nf_tables_table_disable(net,
55dd6f93
PNA		 8067 trans->ctx.table);
8068 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8069 }
8070 } else {
f2a6d766 8071 nft_clear(net, trans->ctx.table);
55dd6f93 8072 }
35151d84 8073 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 8074 nft_trans_destroy(trans);
8075 break;
8076 case NFT_MSG_DELTABLE:
f2a6d766 8077 list_del_rcu(&trans->ctx.table->list);
35151d84 8078 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 8079 break;
91c7b38d 8080 case NFT_MSG_NEWCHAIN:
9f8aac0b 8081 if (nft_trans_chain_update(trans)) {
91c7b38d 8082 nft_chain_commit_update(trans);
9f8aac0b
FW		 8083 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8084 /* trans destroyed after rcu grace period */
8085 } else {
66293c46 8086 nft_chain_commit_drop_policy(trans);
664b0f8c 8087 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 8088 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8089 nft_trans_destroy(trans);
8090 }
91c7b38d
PNA		 8091 break;
8092 case NFT_MSG_DELCHAIN:
1b2470e5 8093 nft_chain_del(trans->ctx.chain);
35151d84 8094 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 8095 nf_tables_unregister_hook(trans->ctx.net,
8096 trans->ctx.table,
8097 trans->ctx.chain);
91c7b38d 8098 break;
b380e5c7 8099 case NFT_MSG_NEWRULE:
889f7ee7 8100 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 8101 nf_tables_rule_notify(&trans->ctx,
37082f93 8102 nft_trans_rule(trans),
35151d84 8103 NFT_MSG_NEWRULE);
37082f93 8104 nft_trans_destroy(trans);
b380e5c7
PNA		 8105 break;
8106 case NFT_MSG_DELRULE:
8107 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 8108 nf_tables_rule_notify(&trans->ctx,
8109 nft_trans_rule(trans),
8110 NFT_MSG_DELRULE);
f6ac8585
PNA		 8111 nft_rule_expr_deactivate(&trans->ctx,
8112 nft_trans_rule(trans),
8113 NFT_TRANS_COMMIT);
b380e5c7 8114 break;
958bee14 8115 case NFT_MSG_NEWSET:
37a9cc52 8116 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 8117 /* This avoids hitting -EBUSY when deleting the table
8118 * from the transaction.
8119 */
408070d6 8120 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 8121 !list_empty(&nft_trans_set(trans)->bindings))
8122 trans->ctx.table->use--;
8123
958bee14 8124 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 8125 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 8126 nft_trans_destroy(trans);
8127 break;
8128 case NFT_MSG_DELSET:
37a9cc52 8129 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 8130 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 8131 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 8132 break;
60319eb1 8133 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 8134 te = (struct nft_trans_elem *)trans->data;
8135
42a55769 8136 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 8137 nf_tables_setelem_notify(&trans->ctx, te->set,
8138 &te->elem,
60319eb1
PNA		 8139 NFT_MSG_NEWSETELEM, 0);
8140 nft_trans_destroy(trans);
8141 break;
8142 case NFT_MSG_DELSETELEM:
a3716e70 8143 te = (struct nft_trans_elem *)trans->data;
fe2811eb 8144
a3716e70
PNA		 8145 nf_tables_setelem_notify(&trans->ctx, te->set,
8146 &te->elem,
60319eb1 8147 NFT_MSG_DELSETELEM, 0);
5cb82a38 8148 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 8149 atomic_dec(&te->set->nelems);
8150 te->set->ndeact--;
60319eb1 8151 break;
e5009240 8152 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 8153 if (nft_trans_obj_update(trans)) {
8154 nft_obj_commit_update(trans);
8155 nf_tables_obj_notify(&trans->ctx,
8156 nft_trans_obj(trans),
8157 NFT_MSG_NEWOBJ);
8158 } else {
8159 nft_clear(net, nft_trans_obj(trans));
8160 nf_tables_obj_notify(&trans->ctx,
8161 nft_trans_obj(trans),
8162 NFT_MSG_NEWOBJ);
8163 nft_trans_destroy(trans);
8164 }
e5009240
PNA		 8165 break;
8166 case NFT_MSG_DELOBJ:
d152159b 8167 nft_obj_del(nft_trans_obj(trans));
e5009240
PNA		 8168 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8169 NFT_MSG_DELOBJ);
8170 break;
3b49e2e9 8171 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 8172 if (nft_trans_flowtable_update(trans)) {
8173 nf_tables_flowtable_notify(&trans->ctx,
8174 nft_trans_flowtable(trans),
8175 &nft_trans_flowtable_hooks(trans),
8176 NFT_MSG_NEWFLOWTABLE);
8177 list_splice(&nft_trans_flowtable_hooks(trans),
8178 &nft_trans_flowtable(trans)->hook_list);
8179 } else {
8180 nft_clear(net, nft_trans_flowtable(trans));
8181 nf_tables_flowtable_notify(&trans->ctx,
8182 nft_trans_flowtable(trans),
8183 &nft_trans_flowtable(trans)->hook_list,
8184 NFT_MSG_NEWFLOWTABLE);
8185 }
3b49e2e9
PNA		 8186 nft_trans_destroy(trans);
8187 break;
8188 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 8189 if (nft_trans_flowtable_update(trans)) {
8190 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8191 &nft_trans_flowtable_hooks(trans));
8192 nf_tables_flowtable_notify(&trans->ctx,
8193 nft_trans_flowtable(trans),
8194 &nft_trans_flowtable_hooks(trans),
8195 NFT_MSG_DELFLOWTABLE);
8196 nft_unregister_flowtable_net_hooks(net,
8197 &nft_trans_flowtable_hooks(trans));
8198 } else {
8199 list_del_rcu(&nft_trans_flowtable(trans)->list);
8200 nf_tables_flowtable_notify(&trans->ctx,
8201 nft_trans_flowtable(trans),
8202 &nft_trans_flowtable(trans)->hook_list,
8203 NFT_MSG_DELFLOWTABLE);
8204 nft_unregister_flowtable_net_hooks(net,
8205 &nft_trans_flowtable(trans)->hook_list);
8206 }
3b49e2e9 8207 break;
37082f93 8208 }
37082f93
PNA		 8209 }
8210
67cc570e 8211 nft_commit_notify(net, NETLINK_CB(skb).portid);
84d7fce6 8212 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
0935d558 8213 nf_tables_commit_release(net);
37082f93
PNA		 8214
8215 return 0;
8216}
8217
eb014de4
PNA		 8218static void nf_tables_module_autoload(struct net *net)
8219{
8220 struct nft_module_request *req, *next;
8221 LIST_HEAD(module_list);
8222
8223 list_splice_init(&net->nft.module_list, &module_list);
8224 mutex_unlock(&net->nft.commit_mutex);
8225 list_for_each_entry_safe(req, next, &module_list, list) {
1d305ba4
FW		 8226 request_module("%s", req->module);
8227 req->done = true;
eb014de4
PNA		 8228 }
8229 mutex_lock(&net->nft.commit_mutex);
8230 list_splice(&module_list, &net->nft.module_list);
8231}
8232
b326dd37 8233static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 8234{
c7c32e72
PNA		 8235 switch (trans->msg_type) {
8236 case NFT_MSG_NEWTABLE:
8237 nf_tables_table_destroy(&trans->ctx);
8238 break;
8239 case NFT_MSG_NEWCHAIN:
43a605f2 8240 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 8241 break;
8242 case NFT_MSG_NEWRULE:
8243 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8244 break;
8245 case NFT_MSG_NEWSET:
0c2a85ed 8246 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 8247 break;
61edafbb
PM		 8248 case NFT_MSG_NEWSETELEM:
8249 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 8250 nft_trans_elem(trans).priv, true);
61edafbb 8251 break;
e5009240 8252 case NFT_MSG_NEWOBJ:
00bfb320 8253 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 8254 break;
3b49e2e9 8255 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 8256 if (nft_trans_flowtable_update(trans))
8257 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8258 else
8259 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 8260 break;
c7c32e72
PNA		 8261 }
8262 kfree(trans);
8263}
8264
c0391b6a 8265static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
37082f93 8266{
37082f93 8267 struct nft_trans *trans, *next;
02263db0 8268 struct nft_trans_elem *te;
abadb2f8 8269 struct nft_hook *hook;
37082f93 8270
c0391b6a
PNA		 8271 if (action == NFNL_ABORT_VALIDATE &&
8272 nf_tables_validate(net) < 0)
8273 return -EAGAIN;
8274
a907e36d
XL		 8275 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8276 list) {
b380e5c7 8277 switch (trans->msg_type) {
55dd6f93
PNA		 8278 case NFT_MSG_NEWTABLE:
8279 if (nft_trans_table_update(trans)) {
8280 if (nft_trans_table_enable(trans)) {
664b0f8c 8281 nf_tables_table_disable(net,
55dd6f93
PNA		 8282 trans->ctx.table);
8283 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8284 }
8285 nft_trans_destroy(trans);
8286 } else {
e688a7f8 8287 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 8288 }
8289 break;
8290 case NFT_MSG_DELTABLE:
f2a6d766 8291 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 8292 nft_trans_destroy(trans);
8293 break;
91c7b38d
PNA		 8294 case NFT_MSG_NEWCHAIN:
8295 if (nft_trans_chain_update(trans)) {
982f4051 8296 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 8297 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 8298 nft_trans_destroy(trans);
8299 } else {
d0e2c7de
PNA		 8300 if (nft_chain_is_bound(trans->ctx.chain)) {
8301 nft_trans_destroy(trans);
8302 break;
8303 }
4fefee57 8304 trans->ctx.table->use--;
1b2470e5 8305 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 8306 nf_tables_unregister_hook(trans->ctx.net,
8307 trans->ctx.table,
8308 trans->ctx.chain);
91c7b38d
PNA		 8309 }
8310 break;
8311 case NFT_MSG_DELCHAIN:
4fefee57 8312 trans->ctx.table->use++;
664b0f8c 8313 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 8314 nft_trans_destroy(trans);
8315 break;
b380e5c7 8316 case NFT_MSG_NEWRULE:
4fefee57 8317 trans->ctx.chain->use--;
b380e5c7 8318 list_del_rcu(&nft_trans_rule(trans)->list);
f6ac8585
PNA		 8319 nft_rule_expr_deactivate(&trans->ctx,
8320 nft_trans_rule(trans),
8321 NFT_TRANS_ABORT);
b380e5c7
PNA		 8322 break;
8323 case NFT_MSG_DELRULE:
4fefee57 8324 trans->ctx.chain->use++;
889f7ee7 8325 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 8326 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
37082f93 8327 nft_trans_destroy(trans);
b380e5c7 8328 break;
958bee14 8329 case NFT_MSG_NEWSET:
4fefee57 8330 trans->ctx.table->use--;
6a0a8d10 8331 if (nft_trans_set_bound(trans)) {
40ba1d9b
PNA		 8332 nft_trans_destroy(trans);
8333 break;
8334 }
8335 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 8336 break;
8337 case NFT_MSG_DELSET:
4fefee57 8338 trans->ctx.table->use++;
37a9cc52 8339 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 8340 nft_trans_destroy(trans);
8341 break;
60319eb1 8342 case NFT_MSG_NEWSETELEM:
6a0a8d10 8343 if (nft_trans_elem_set_bound(trans)) {
40ba1d9b
PNA		 8344 nft_trans_destroy(trans);
8345 break;
8346 }
02263db0 8347 te = (struct nft_trans_elem *)trans->data;
5cb82a38 8348 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 8349 atomic_dec(&te->set->nelems);
60319eb1
PNA		 8350 break;
8351 case NFT_MSG_DELSETELEM:
cc02e457
PM		 8352 te = (struct nft_trans_elem *)trans->data;
8353
59105446 8354 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 8355 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 8356 te->set->ndeact--;
cc02e457 8357
e5009240
PNA		 8358 nft_trans_destroy(trans);
8359 break;
8360 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 8361 if (nft_trans_obj_update(trans)) {
8362 kfree(nft_trans_obj_newobj(trans));
8363 nft_trans_destroy(trans);
8364 } else {
8365 trans->ctx.table->use--;
8366 nft_obj_del(nft_trans_obj(trans));
8367 }
e5009240
PNA		 8368 break;
8369 case NFT_MSG_DELOBJ:
8370 trans->ctx.table->use++;
8371 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 8372 nft_trans_destroy(trans);
8373 break;
3b49e2e9 8374 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 8375 if (nft_trans_flowtable_update(trans)) {
8376 nft_unregister_flowtable_net_hooks(net,
8377 &nft_trans_flowtable_hooks(trans));
8378 } else {
8379 trans->ctx.table->use--;
8380 list_del_rcu(&nft_trans_flowtable(trans)->list);
8381 nft_unregister_flowtable_net_hooks(net,
8382 &nft_trans_flowtable(trans)->hook_list);
8383 }
3b49e2e9
PNA		 8384 break;
8385 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 8386 if (nft_trans_flowtable_update(trans)) {
8387 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8388 hook->inactive = false;
8389 } else {
8390 trans->ctx.table->use++;
8391 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8392 }
3b49e2e9
PNA		 8393 nft_trans_destroy(trans);
8394 break;
37082f93 8395 }
37082f93
PNA		 8396 }
8397
b326dd37
PNA		 8398 synchronize_rcu();
8399
a1cee076
PNA		 8400 list_for_each_entry_safe_reverse(trans, next,
8401 &net->nft.commit_list, list) {
c7c32e72 8402 list_del(&trans->list);
b326dd37 8403 nf_tables_abort_release(trans);
37082f93
PNA		 8404 }
8405
c0391b6a 8406 if (action == NFNL_ABORT_AUTOLOAD)
eb014de4
PNA		 8407 nf_tables_module_autoload(net);
8408 else
8409 nf_tables_module_autoload_cleanup(net);
8410
37082f93
PNA		 8411 return 0;
8412}
8413
a654de8f
PNA		 8414static void nf_tables_cleanup(struct net *net)
8415{
8416 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8417}
8418
c0391b6a
PNA		 8419static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8420 enum nfnl_abort_action action)
71ad00c5 8421{
c0391b6a 8422 int ret = __nf_tables_abort(net, action);
f102d66b
FW		 8423
8424 mutex_unlock(&net->nft.commit_mutex);
8425
8426 return ret;
71ad00c5
FW		 8427}
8428
74e8bcd2
PNA		 8429static bool nf_tables_valid_genid(struct net *net, u32 genid)
8430{
f102d66b
FW		 8431 bool genid_ok;
8432
8433 mutex_lock(&net->nft.commit_mutex);
8434
8435 genid_ok = genid == 0 || net->nft.base_seq == genid;
8436 if (!genid_ok)
8437 mutex_unlock(&net->nft.commit_mutex);
8438
8439 /* else, commit mutex has to be released by commit or abort function */
8440 return genid_ok;
74e8bcd2
PNA		 8441}
8442
96518518
PM		 8443static const struct nfnetlink_subsystem nf_tables_subsys = {
8444 .name = "nf_tables",
8445 .subsys_id = NFNL_SUBSYS_NFTABLES,
8446 .cb_count = NFT_MSG_MAX,
8447 .cb = nf_tables_cb,
0628b123
PNA		 8448 .commit = nf_tables_commit,
8449 .abort = nf_tables_abort,
a654de8f 8450 .cleanup = nf_tables_cleanup,
74e8bcd2 8451 .valid_genid = nf_tables_valid_genid,
be2ab5b4 8452 .owner = THIS_MODULE,
96518518
PM		 8453};
8454
7210e4e3 8455int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 8456 enum nft_chain_types type)
7210e4e3
PNA		 8457{
8458 const struct nft_base_chain *basechain;
8459
f323d954 8460 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 8461 basechain = nft_base_chain(chain);
8462 if (basechain->type->type != type)
8463 return -EOPNOTSUPP;
8464 }
8465 return 0;
8466}
8467EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8468
75e8d06d
PNA		 8469int nft_chain_validate_hooks(const struct nft_chain *chain,
8470 unsigned int hook_flags)
8471{
8472 struct nft_base_chain *basechain;
8473
f323d954 8474 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 8475 basechain = nft_base_chain(chain);
8476
c974a3a3 8477 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 8478 return 0;
8479
8480 return -EOPNOTSUPP;
8481 }
8482
8483 return 0;
8484}
8485EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8486
20a69341
PM		 8487/*
8488 * Loop detection - walk through the ruleset beginning at the destination chain
8489 * of a new jump until either the source chain is reached (loop) or all
8490 * reachable chains have been traversed.
8491 *
8492 * The loop check is performed whenever a new jump verdict is added to an
8493 * expression or verdict map or a verdict map is bound to a new chain.
8494 */
8495
8496static int nf_tables_check_loops(const struct nft_ctx *ctx,
8497 const struct nft_chain *chain);
8498
8499static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 8500 struct nft_set *set,
20a69341 8501 const struct nft_set_iter *iter,
de70185d 8502 struct nft_set_elem *elem)
20a69341 8503{
fe2811eb
PM		 8504 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8505 const struct nft_data *data;
8506
8507 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8508 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 8509 return 0;
8510
fe2811eb 8511 data = nft_set_ext_data(ext);
1ca2e170 8512 switch (data->verdict.code) {
20a69341
PM		 8513 case NFT_JUMP:
8514 case NFT_GOTO:
1ca2e170 8515 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 8516 default:
8517 return 0;
8518 }
8519}
8520
8521static int nf_tables_check_loops(const struct nft_ctx *ctx,
8522 const struct nft_chain *chain)
8523{
8524 const struct nft_rule *rule;
8525 const struct nft_expr *expr, *last;
de70185d 8526 struct nft_set *set;
20a69341
PM		 8527 struct nft_set_binding *binding;
8528 struct nft_set_iter iter;
20a69341
PM		 8529
8530 if (ctx->chain == chain)
8531 return -ELOOP;
8532
8533 list_for_each_entry(rule, &chain->rules, list) {
8534 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 8535 struct nft_immediate_expr *priv;
8536 const struct nft_data *data;
0ca743a5
PNA		 8537 int err;
8538
a654de8f 8539 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 8540 continue;
8541
a654de8f
PNA		 8542 priv = nft_expr_priv(expr);
8543 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 8544 continue;
20a69341 8545
a654de8f 8546 data = &priv->data;
1ca2e170 8547 switch (data->verdict.code) {
20a69341
PM		 8548 case NFT_JUMP:
8549 case NFT_GOTO:
1ca2e170
PM		 8550 err = nf_tables_check_loops(ctx,
8551 data->verdict.chain);
20a69341
PM		 8552 if (err < 0)
8553 return err;
8554 default:
8555 break;
8556 }
8557 }
8558 }
8559
8560 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 8561 if (!nft_is_active_next(ctx->net, set))
8562 continue;
20a69341
PM		 8563 if (!(set->flags & NFT_SET_MAP) ||
8564 set->dtype != NFT_DATA_VERDICT)
8565 continue;
8566
8567 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 8568 if (!(binding->flags & NFT_SET_MAP) ||
8569 binding->chain != chain)
20a69341
PM		 8570 continue;
8571
8588ac09 8572 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 8573 iter.skip = 0;
8574 iter.count = 0;
8575 iter.err = 0;
8576 iter.fn = nf_tables_loop_check_setelem;
8577
8578 set->ops->walk(ctx, set, &iter);
8579 if (iter.err < 0)
8580 return iter.err;
8581 }
8582 }
8583
8584 return 0;
8585}
8586
36b701fa
LGL		 8587/**
8588 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
8589 *
8590 * @attr: netlink attribute to fetch value from
8591 * @max: maximum value to be stored in dest
8592 * @dest: pointer to the variable
8593 *
8594 * Parse, check and store a given u32 netlink attribute into variable.
8595 * This function returns -ERANGE if the value goes over maximum value.
8596 * Otherwise a 0 is returned and the attribute value is stored in the
8597 * destination variable.
8598 */
f1d505bb 8599int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 8600{
09525a09 8601 u32 val;
36b701fa
LGL		 8602
8603 val = ntohl(nla_get_be32(attr));
8604 if (val > max)
8605 return -ERANGE;
8606
8607 *dest = val;
8608 return 0;
8609}
8610EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8611
49499c3e
PM		 8612/**
8613 * nft_parse_register - parse a register value from a netlink attribute
8614 *
8615 * @attr: netlink attribute
8616 *
8617 * Parse and translate a register value from a netlink attribute.
8618 * Registers used to be 128 bit wide, these register numbers will be
8619 * mapped to the corresponding 32 bit register numbers.
8620 */
08a01c11 8621static unsigned int nft_parse_register(const struct nlattr *attr)
b1c96ed3 8622{
49499c3e
PM		 8623 unsigned int reg;
8624
8625 reg = ntohl(nla_get_be32(attr));
8626 switch (reg) {
8627 case NFT_REG_VERDICT...NFT_REG_4:
8628 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8629 default:
8630 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8631 }
b1c96ed3 8632}
b1c96ed3 8633
49499c3e
PM		 8634/**
8635 * nft_dump_register - dump a register value to a netlink attribute
8636 *
8637 * @skb: socket buffer
8638 * @attr: attribute number
8639 * @reg: register number
8640 *
8641 * Construct a netlink attribute containing the register number. For
8642 * compatibility reasons, register numbers being a multiple of 4 are
8643 * translated to the corresponding 128 bit register numbers.
8644 */
b1c96ed3
PM		 8645int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8646{
49499c3e
PM		 8647 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8648 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8649 else
8650 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8651
b1c96ed3
PM		 8652 return nla_put_be32(skb, attr, htonl(reg));
8653}
8654EXPORT_SYMBOL_GPL(nft_dump_register);
8655
96518518 8656/**
d07db988 8657 * nft_validate_register_load - validate a load from a register
96518518
PM		 8658 *
8659 * @reg: the register number
d07db988 8660 * @len: the length of the data
96518518
PM		 8661 *
8662 * Validate that the input register is one of the general purpose
d07db988 8663 * registers and that the length of the load is within the bounds.
96518518 8664 */
4f16d25c 8665static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 8666{
49499c3e 8667 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 8668 return -EINVAL;
d07db988
PM		 8669 if (len == 0)
8670 return -EINVAL;
c593642c 8671 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
d07db988 8672 return -ERANGE;
49499c3e 8673
96518518
PM		 8674 return 0;
8675}
4f16d25c
PNA		 8676
8677int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
8678{
8679 u32 reg;
8680 int err;
8681
8682 reg = nft_parse_register(attr);
8683 err = nft_validate_register_load(reg, len);
8684 if (err < 0)
8685 return err;
8686
8687 *sreg = reg;
8688 return 0;
8689}
8690EXPORT_SYMBOL_GPL(nft_parse_register_load);
96518518 8691
96518518 8692/**
1ec10212 8693 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 8694 *
8695 * @ctx: context of the expression performing the load
8696 * @reg: the destination register number
8697 * @data: the data to load
8698 * @type: the data type
45d9bcda 8699 * @len: the length of the data
96518518
PM		 8700 *
8701 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 8702 * the destination register and the length is within the bounds.
8703 * A value of NULL for the data means that its runtime gathered
58f40ab6 8704 * data.
96518518 8705 */
345023b0
PNA		 8706static int nft_validate_register_store(const struct nft_ctx *ctx,
8707 enum nft_registers reg,
8708 const struct nft_data *data,
8709 enum nft_data_types type,
8710 unsigned int len)
96518518 8711{
20a69341
PM		 8712 int err;
8713
96518518
PM		 8714 switch (reg) {
8715 case NFT_REG_VERDICT:
58f40ab6 8716 if (type != NFT_DATA_VERDICT)
96518518 8717 return -EINVAL;
20a69341 8718
58f40ab6 8719 if (data != NULL &&
1ca2e170
PM		 8720 (data->verdict.code == NFT_GOTO ||
8721 data->verdict.code == NFT_JUMP)) {
8722 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 8723 if (err < 0)
8724 return err;
20a69341
PM		 8725 }
8726
96518518
PM		 8727 return 0;
8728 default:
49499c3e 8729 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 8730 return -EINVAL;
45d9bcda
PM		 8731 if (len == 0)
8732 return -EINVAL;
49499c3e 8733 if (reg * NFT_REG32_SIZE + len >
c593642c 8734 sizeof_field(struct nft_regs, data))
45d9bcda 8735 return -ERANGE;
27e6d201 8736
96518518
PM		 8737 if (data != NULL && type != NFT_DATA_VALUE)
8738 return -EINVAL;
8739 return 0;
8740 }
8741}
345023b0
PNA		 8742
8743int nft_parse_register_store(const struct nft_ctx *ctx,
8744 const struct nlattr *attr, u8 *dreg,
8745 const struct nft_data *data,
8746 enum nft_data_types type, unsigned int len)
8747{
8748 int err;
8749 u32 reg;
8750
8751 reg = nft_parse_register(attr);
8752 err = nft_validate_register_store(ctx, reg, data, type, len);
8753 if (err < 0)
8754 return err;
8755
8756 *dreg = reg;
8757 return 0;
8758}
8759EXPORT_SYMBOL_GPL(nft_parse_register_store);
96518518
PM		 8760
8761static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8762 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
8763 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
8764 .len = NFT_CHAIN_MAXNAMELEN - 1 },
51d70f18 8765 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 8766};
8767
8768static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8769 struct nft_data_desc *desc, const struct nlattr *nla)
8770{
664b0f8c 8771 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 8772 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8773 struct nft_chain *chain;
8774 int err;
8775
8cb08174
JB		 8776 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8777 nft_verdict_policy, NULL);
96518518
PM		 8778 if (err < 0)
8779 return err;
8780
8781 if (!tb[NFTA_VERDICT_CODE])
8782 return -EINVAL;
1ca2e170 8783 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 8784
1ca2e170 8785 switch (data->verdict.code) {
e0abdadc 8786 default:
1ca2e170 8787 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 8788 case NF_ACCEPT:
8789 case NF_DROP:
8790 case NF_QUEUE:
8791 break;
8792 default:
8793 return -EINVAL;
8794 }
954d8297 8795 fallthrough;
96518518
PM		 8796 case NFT_CONTINUE:
8797 case NFT_BREAK:
8798 case NFT_RETURN:
96518518
PM		 8799 break;
8800 case NFT_JUMP:
8801 case NFT_GOTO:
51d70f18
PNA		 8802 if (tb[NFTA_VERDICT_CHAIN]) {
8803 chain = nft_chain_lookup(ctx->net, ctx->table,
8804 tb[NFTA_VERDICT_CHAIN],
8805 genmask);
8806 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8807 chain = nft_chain_lookup_byid(ctx->net,
8808 tb[NFTA_VERDICT_CHAIN_ID]);
8809 if (IS_ERR(chain))
8810 return PTR_ERR(chain);
8811 } else {
96518518 8812 return -EINVAL;
51d70f18
PNA		 8813 }
8814
96518518
PM		 8815 if (IS_ERR(chain))
8816 return PTR_ERR(chain);
f323d954 8817 if (nft_is_base_chain(chain))
96518518
PM		 8818 return -EOPNOTSUPP;
8819
96518518 8820 chain->use++;
1ca2e170 8821 data->verdict.chain = chain;
96518518 8822 break;
96518518
PM		 8823 }
8824
4c4ed074 8825 desc->len = sizeof(data->verdict);
96518518
PM		 8826 desc->type = NFT_DATA_VERDICT;
8827 return 0;
8828}
8829
8830static void nft_verdict_uninit(const struct nft_data *data)
8831{
d0e2c7de
PNA		 8832 struct nft_chain *chain;
8833 struct nft_rule *rule;
8834
1ca2e170 8835 switch (data->verdict.code) {
96518518
PM		 8836 case NFT_JUMP:
8837 case NFT_GOTO:
d0e2c7de
PNA		 8838 chain = data->verdict.chain;
8839 chain->use--;
8840
8841 if (!nft_chain_is_bound(chain))
8842 break;
8843
8844 chain->table->use--;
8845 list_for_each_entry(rule, &chain->rules, list)
8846 chain->use--;
8847
8848 nft_chain_del(chain);
96518518
PM		 8849 break;
8850 }
8851}
8852
33d5a7b1 8853int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 8854{
8855 struct nlattr *nest;
8856
ae0be8de 8857 nest = nla_nest_start_noflag(skb, type);
96518518
PM		 8858 if (!nest)
8859 goto nla_put_failure;
8860
33d5a7b1 8861 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 8862 goto nla_put_failure;
8863
33d5a7b1 8864 switch (v->code) {
96518518
PM		 8865 case NFT_JUMP:
8866 case NFT_GOTO:
1ca2e170 8867 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 8868 v->chain->name))
96518518
PM		 8869 goto nla_put_failure;
8870 }
8871 nla_nest_end(skb, nest);
8872 return 0;
8873
8874nla_put_failure:
8875 return -1;
8876}
8877
d0a11fc3
PM		 8878static int nft_value_init(const struct nft_ctx *ctx,
8879 struct nft_data *data, unsigned int size,
96518518
PM		 8880 struct nft_data_desc *desc, const struct nlattr *nla)
8881{
8882 unsigned int len;
8883
8884 len = nla_len(nla);
8885 if (len == 0)
8886 return -EINVAL;
d0a11fc3 8887 if (len > size)
96518518
PM		 8888 return -EOVERFLOW;
8889
d0a11fc3 8890 nla_memcpy(data->data, nla, len);
96518518
PM		 8891 desc->type = NFT_DATA_VALUE;
8892 desc->len = len;
8893 return 0;
8894}
8895
8896static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8897 unsigned int len)
8898{
8899 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8900}
8901
8902static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 8903 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 8904 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
8905};
8906
8907/**
8908 * nft_data_init - parse nf_tables data netlink attributes
8909 *
8910 * @ctx: context of the expression using the data
8911 * @data: destination struct nft_data
d0a11fc3 8912 * @size: maximum data length
96518518
PM		 8913 * @desc: data description
8914 * @nla: netlink attribute containing data
8915 *
8916 * Parse the netlink data attributes and initialize a struct nft_data.
8917 * The type and length of data are returned in the data description.
8918 *
8919 * The caller can indicate that it only wants to accept data of type
8920 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8921 */
d0a11fc3
PM		 8922int nft_data_init(const struct nft_ctx *ctx,
8923 struct nft_data *data, unsigned int size,
96518518
PM		 8924 struct nft_data_desc *desc, const struct nlattr *nla)
8925{
8926 struct nlattr *tb[NFTA_DATA_MAX + 1];
8927 int err;
8928
8cb08174
JB		 8929 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8930 nft_data_policy, NULL);
96518518
PM		 8931 if (err < 0)
8932 return err;
8933
8934 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 8935 return nft_value_init(ctx, data, size, desc,
8936 tb[NFTA_DATA_VALUE]);
96518518
PM		 8937 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8938 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8939 return -EINVAL;
8940}
8941EXPORT_SYMBOL_GPL(nft_data_init);
8942
8943/**
59105446 8944 * nft_data_release - release a nft_data item
96518518
PM		 8945 *
8946 * @data: struct nft_data to release
8947 * @type: type of data
8948 *
8949 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8950 * all others need to be released by calling this function.
8951 */
59105446 8952void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 8953{
960bd2c2 8954 if (type < NFT_DATA_VERDICT)
96518518 8955 return;
960bd2c2 8956 switch (type) {
96518518
PM		 8957 case NFT_DATA_VERDICT:
8958 return nft_verdict_uninit(data);
8959 default:
8960 WARN_ON(1);
8961 }
8962}
59105446 8963EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 8964
8965int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8966 enum nft_data_types type, unsigned int len)
8967{
8968 struct nlattr *nest;
8969 int err;
8970
ae0be8de 8971 nest = nla_nest_start_noflag(skb, attr);
96518518
PM		 8972 if (nest == NULL)
8973 return -1;
8974
8975 switch (type) {
8976 case NFT_DATA_VALUE:
8977 err = nft_value_dump(skb, data, len);
8978 break;
8979 case NFT_DATA_VERDICT:
33d5a7b1 8980 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 8981 break;
8982 default:
8983 err = -EINVAL;
8984 WARN_ON(1);
8985 }
8986
8987 nla_nest_end(skb, nest);
8988 return err;
8989}
8990EXPORT_SYMBOL_GPL(nft_data_dump);
8991
5ebe0b0e
PNA		 8992int __nft_release_basechain(struct nft_ctx *ctx)
8993{
8994 struct nft_rule *rule, *nr;
8995
fa5950e4
FW		 8996 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8997 return 0;
5ebe0b0e 8998
c974a3a3 8999 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 9000 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9001 list_del(&rule->list);
9002 ctx->chain->use--;
bb7b40ae 9003 nf_tables_rule_release(ctx, rule);
5ebe0b0e 9004 }
1b2470e5 9005 nft_chain_del(ctx->chain);
5ebe0b0e 9006 ctx->table->use--;
43a605f2 9007 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 9008
9009 return 0;
9010}
9011EXPORT_SYMBOL_GPL(__nft_release_basechain);
9012
00dfe9be
PNA		 9013static void __nft_release_hook(struct net *net, struct nft_table *table)
9014{
9015 struct nft_chain *chain;
9016
9017 list_for_each_entry(chain, &table->chains, list)
9018 nf_tables_unregister_hook(net, table, chain);
9019}
9020
767d1216
PNA		 9021static void __nft_release_hooks(struct net *net)
9022{
9023 struct nft_table *table;
767d1216 9024
00dfe9be
PNA		 9025 list_for_each_entry(table, &net->nft.tables, list)
9026 __nft_release_hook(net, table);
767d1216
PNA		 9027}
9028
fd020332 9029static void __nft_release_table(struct net *net, struct nft_table *table)
df05ef87 9030{
3b49e2e9 9031 struct nft_flowtable *flowtable, *nf;
df05ef87 9032 struct nft_chain *chain, *nc;
e5009240 9033 struct nft_object *obj, *ne;
df05ef87
PNA		 9034 struct nft_rule *rule, *nr;
9035 struct nft_set *set, *ns;
9036 struct nft_ctx ctx = {
9037 .net = net,
43a605f2 9038 .family = NFPROTO_NETDEV,
df05ef87
PNA		 9039 };
9040
fd020332
PNA		 9041 ctx.family = table->family;
9042 ctx.table = table;
9043 list_for_each_entry(chain, &table->chains, list) {
9044 ctx.chain = chain;
9045 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9046 list_del(&rule->list);
9047 chain->use--;
9048 nf_tables_rule_release(&ctx, rule);
df05ef87 9049 }
df05ef87 9050 }
fd020332
PNA		 9051 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9052 list_del(&flowtable->list);
9053 table->use--;
9054 nf_tables_flowtable_destroy(flowtable);
9055 }
9056 list_for_each_entry_safe(set, ns, &table->sets, list) {
9057 list_del(&set->list);
9058 table->use--;
9059 nft_set_destroy(&ctx, set);
9060 }
9061 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9062 nft_obj_del(obj);
9063 table->use--;
9064 nft_obj_destroy(&ctx, obj);
9065 }
9066 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9067 ctx.chain = chain;
9068 nft_chain_del(chain);
9069 table->use--;
9070 nf_tables_chain_destroy(&ctx);
9071 }
9072 list_del(&table->list);
9073 nf_tables_table_destroy(&ctx);
9074}
9075
6001a930 9076static void __nft_release_tables(struct net *net, u32 nlpid)
fd020332
PNA		 9077{
9078 struct nft_table *table, *nt;
9079
6001a930
PNA		 9080 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9081 if (nft_table_has_owner(table) &&
9082 nlpid != table->nlpid)
9083 continue;
9084
fd020332 9085 __nft_release_table(net, table);
6001a930
PNA		 9086 }
9087}
9088
9089static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9090 void *ptr)
9091{
9092 struct netlink_notify *n = ptr;
9093 struct nft_table *table, *nt;
9094 struct net *net = n->net;
9095 bool release = false;
9096
9097 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9098 return NOTIFY_DONE;
9099
9100 mutex_lock(&net->nft.commit_mutex);
9101 list_for_each_entry(table, &net->nft.tables, list) {
9102 if (nft_table_has_owner(table) &&
9103 n->portid == table->nlpid) {
9104 __nft_release_hook(net, table);
9105 release = true;
9106 }
9107 }
9108 if (release) {
9109 synchronize_rcu();
9110 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
9111 if (nft_table_has_owner(table) &&
9112 n->portid == table->nlpid)
9113 __nft_release_table(net, table);
9114 }
9115 }
9116 mutex_unlock(&net->nft.commit_mutex);
9117
9118 return NOTIFY_DONE;
df05ef87
PNA		 9119}
9120
6001a930
PNA		 9121static struct notifier_block nft_nl_notifier = {
9122 .notifier_call = nft_rcv_nl_event,
9123};
9124
dd4cbef7
PNA		 9125static int __net_init nf_tables_init_net(struct net *net)
9126{
9127 INIT_LIST_HEAD(&net->nft.tables);
9128 INIT_LIST_HEAD(&net->nft.commit_list);
eb014de4 9129 INIT_LIST_HEAD(&net->nft.module_list);
67cc570e 9130 INIT_LIST_HEAD(&net->nft.notify_list);
f102d66b 9131 mutex_init(&net->nft.commit_mutex);
dd4cbef7 9132 net->nft.base_seq = 1;
a654de8f
PNA		 9133 net->nft.validate_state = NFT_VALIDATE_SKIP;
9134
dd4cbef7
PNA		 9135 return 0;
9136}
9137
767d1216
PNA		 9138static void __net_exit nf_tables_pre_exit_net(struct net *net)
9139{
9140 __nft_release_hooks(net);
9141}
9142
dd4cbef7
PNA		 9143static void __net_exit nf_tables_exit_net(struct net *net)
9144{
f102d66b 9145 mutex_lock(&net->nft.commit_mutex);
71ad00c5 9146 if (!list_empty(&net->nft.commit_list))
c0391b6a 9147 __nf_tables_abort(net, NFNL_ABORT_NONE);
6001a930 9148 __nft_release_tables(net, 0);
f102d66b 9149 mutex_unlock(&net->nft.commit_mutex);
dd4cbef7 9150 WARN_ON_ONCE(!list_empty(&net->nft.tables));
1d305ba4 9151 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
67cc570e 9152 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
dd4cbef7
PNA		 9153}
9154
99633ab2 9155static struct pernet_operations nf_tables_net_ops = {
767d1216
PNA		 9156 .init = nf_tables_init_net,
9157 .pre_exit = nf_tables_pre_exit_net,
9158 .exit = nf_tables_exit_net,
99633ab2
PNA		 9159};
9160
96518518
PM		 9161static int __init nf_tables_module_init(void)
9162{
9163 int err;
9164
0935d558 9165 spin_lock_init(&nf_tables_destroy_list_lock);
d209df3e
FW		 9166 err = register_pernet_subsys(&nf_tables_net_ops);
9167 if (err < 0)
9168 return err;
9169
9170 err = nft_chain_filter_init();
9171 if (err < 0)
6001a930 9172 goto err_chain_filter;
02c7b25e 9173
96518518
PM		 9174 err = nf_tables_core_module_init();
9175 if (err < 0)
6001a930 9176 goto err_core_module;
96518518 9177
d209df3e 9178 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
96518518 9179 if (err < 0)
6001a930 9180 goto err_netdev_notifier;
96518518 9181
4d44175a
FW		 9182 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9183 if (err < 0)
6001a930 9184 goto err_rht_objname;
4d44175a 9185
06d392cb 9186 err = nft_offload_init();
9187 if (err < 0)
6001a930
PNA		 9188 goto err_offload;
9189
9190 err = netlink_register_notifier(&nft_nl_notifier);
9191 if (err < 0)
9192 goto err_netlink_notifier;
06d392cb 9193
d209df3e
FW		 9194 /* must be last */
9195 err = nfnetlink_subsys_register(&nf_tables_subsys);
9196 if (err < 0)
6001a930 9197 goto err_nfnl_subsys;
3b49e2e9 9198
c1deb065 9199 nft_chain_route_init();
3474a2c6 9200
d209df3e 9201 return err;
6001a930
PNA		 9202
9203err_nfnl_subsys:
9204 netlink_unregister_notifier(&nft_nl_notifier);
9205err_netlink_notifier:
06d392cb 9206 nft_offload_exit();
6001a930 9207err_offload:
4d44175a 9208 rhltable_destroy(&nft_objname_ht);
6001a930 9209err_rht_objname:
d209df3e 9210 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
6001a930 9211err_netdev_notifier:
96518518 9212 nf_tables_core_module_exit();
6001a930 9213err_core_module:
d209df3e 9214 nft_chain_filter_fini();
6001a930 9215err_chain_filter:
d209df3e 9216 unregister_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 9217 return err;
9218}
9219
9220static void __exit nf_tables_module_exit(void)
9221{
9222 nfnetlink_subsys_unregister(&nf_tables_subsys);
6001a930 9223 netlink_unregister_notifier(&nft_nl_notifier);
06d392cb 9224 nft_offload_exit();
3b49e2e9 9225 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 9226 nft_chain_filter_fini();
c1deb065 9227 nft_chain_route_fini();
71ad00c5 9228 unregister_pernet_subsys(&nf_tables_net_ops);
0935d558 9229 cancel_work_sync(&trans_destroy_work);
1b1bc49c 9230 rcu_barrier();
4d44175a 9231 rhltable_destroy(&nft_objname_ht);
96518518 9232 nf_tables_core_module_exit();
96518518
PM		 9233}
9234
9235module_init(nf_tables_module_init);
9236module_exit(nf_tables_module_exit);
9237
9238MODULE_LICENSE("GPL");
9239MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9240MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux 6.x block layer and io_uring tree(s)