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netfilter: nf_tables: add transaction helper functions
[linux-2.6-block.git] / net / netfilter / nf_tables_api.c
CommitLineData
96518518 1/*
20a69341 2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518
PM		 3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/list.h>
14#include <linux/skbuff.h>
15#include <linux/netlink.h>
16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_tables_core.h>
20#include <net/netfilter/nf_tables.h>
99633ab2 21#include <net/net_namespace.h>
96518518
PM		 22#include <net/sock.h>
23
96518518
PM		 24static LIST_HEAD(nf_tables_expressions);
25
26/**
27 * nft_register_afinfo - register nf_tables address family info
28 *
29 * @afi: address family info to register
30 *
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
33 */
99633ab2 34int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 35{
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
40 return 0;
41}
42EXPORT_SYMBOL_GPL(nft_register_afinfo);
43
44/**
45 * nft_unregister_afinfo - unregister nf_tables address family info
46 *
47 * @afi: address family info to unregister
48 *
49 * Unregister the address family for use with nf_tables.
50 */
51void nft_unregister_afinfo(struct nft_af_info *afi)
52{
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 54 list_del_rcu(&afi->list);
96518518
PM		 55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
56}
57EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
58
99633ab2 59static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 60{
61 struct nft_af_info *afi;
62
99633ab2 63 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 64 if (afi->family == family)
65 return afi;
66 }
67 return NULL;
68}
69
99633ab2
PNA		 70static struct nft_af_info *
71nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 72{
73 struct nft_af_info *afi;
74
99633ab2 75 afi = nft_afinfo_lookup(net, family);
96518518
PM		 76 if (afi != NULL)
77 return afi;
78#ifdef CONFIG_MODULES
79 if (autoload) {
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 83 afi = nft_afinfo_lookup(net, family);
96518518
PM		 84 if (afi != NULL)
85 return ERR_PTR(-EAGAIN);
86 }
87#endif
88 return ERR_PTR(-EAFNOSUPPORT);
89}
90
7c95f6d8
PNA		 91static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
98{
128ad332
PNA		 99 ctx->net = sock_net(skb->sk);
100 ctx->afi = afi;
101 ctx->table = table;
102 ctx->chain = chain;
103 ctx->nla = nla;
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 107}
108
b380e5c7
PNA		 109static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
110 u32 size)
1081d11b
PNA		 111{
112 struct nft_trans *trans;
113
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
115 if (trans == NULL)
116 return NULL;
117
b380e5c7 118 trans->msg_type = msg_type;
1081d11b
PNA		 119 trans->ctx = *ctx;
120
121 return trans;
122}
123
124static void nft_trans_destroy(struct nft_trans *trans)
125{
126 list_del(&trans->list);
127 kfree(trans);
128}
129
c5598794
AB		 130static void nf_tables_unregister_hooks(const struct nft_table *table,
131 const struct nft_chain *chain,
132 unsigned int hook_nops)
133{
134 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
135 chain->flags & NFT_BASE_CHAIN)
136 nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops);
137}
138
ee01d542
AB		 139/* Internal table flags */
140#define NFT_TABLE_INACTIVE (1 << 15)
141
142static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
143{
144 struct nft_trans *trans;
145
146 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
147 if (trans == NULL)
148 return -ENOMEM;
149
150 if (msg_type == NFT_MSG_NEWTABLE)
151 ctx->table->flags |= NFT_TABLE_INACTIVE;
152
153 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
154 return 0;
155}
156
157static int nft_deltable(struct nft_ctx *ctx)
158{
159 int err;
160
161 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
162 if (err < 0)
163 return err;
164
165 list_del_rcu(&ctx->table->list);
166 return err;
167}
168
169static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
170{
171 struct nft_trans *trans;
172
173 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
174 if (trans == NULL)
175 return -ENOMEM;
176
177 if (msg_type == NFT_MSG_NEWCHAIN)
178 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
179
180 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
181 return 0;
182}
183
184static int nft_delchain(struct nft_ctx *ctx)
185{
186 int err;
187
188 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
189 if (err < 0)
190 return err;
191
192 ctx->table->use--;
193 list_del_rcu(&ctx->chain->list);
194
195 return err;
196}
197
198static inline bool
199nft_rule_is_active(struct net *net, const struct nft_rule *rule)
200{
ea4bd995 201 return (rule->genmask & nft_genmask_cur(net)) == 0;
ee01d542
AB		 202}
203
204static inline int
205nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
206{
ea4bd995 207 return (rule->genmask & nft_genmask_next(net)) == 0;
ee01d542
AB		 208}
209
210static inline void
211nft_rule_activate_next(struct net *net, struct nft_rule *rule)
212{
213 /* Now inactive, will be active in the future */
ea4bd995 214 rule->genmask = nft_genmask_cur(net);
ee01d542
AB		 215}
216
217static inline void
218nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
219{
ea4bd995 220 rule->genmask = nft_genmask_next(net);
ee01d542
AB		 221}
222
223static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
224{
ea4bd995 225 rule->genmask &= ~nft_genmask_next(net);
ee01d542
AB		 226}
227
228static int
229nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
230{
231 /* You cannot delete the same rule twice */
232 if (nft_rule_is_active_next(ctx->net, rule)) {
233 nft_rule_deactivate_next(ctx->net, rule);
234 ctx->chain->use--;
235 return 0;
236 }
237 return -ENOENT;
238}
239
240static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
241 struct nft_rule *rule)
242{
243 struct nft_trans *trans;
244
245 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
246 if (trans == NULL)
247 return NULL;
248
249 nft_trans_rule(trans) = rule;
250 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
251
252 return trans;
253}
254
255static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
256{
257 struct nft_trans *trans;
258 int err;
259
260 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
261 if (trans == NULL)
262 return -ENOMEM;
263
264 err = nf_tables_delrule_deactivate(ctx, rule);
265 if (err < 0) {
266 nft_trans_destroy(trans);
267 return err;
268 }
269
270 return 0;
271}
272
273static int nft_delrule_by_chain(struct nft_ctx *ctx)
274{
275 struct nft_rule *rule;
276 int err;
277
278 list_for_each_entry(rule, &ctx->chain->rules, list) {
279 err = nft_delrule(ctx, rule);
280 if (err < 0)
281 return err;
282 }
283 return 0;
284}
285
286/* Internal set flag */
287#define NFT_SET_INACTIVE (1 << 15)
288
289static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
290 struct nft_set *set)
291{
292 struct nft_trans *trans;
293
294 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
295 if (trans == NULL)
296 return -ENOMEM;
297
298 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
299 nft_trans_set_id(trans) =
300 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
301 set->flags |= NFT_SET_INACTIVE;
302 }
303 nft_trans_set(trans) = set;
304 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
305
306 return 0;
307}
308
309static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
310{
311 int err;
312
313 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
314 if (err < 0)
315 return err;
316
317 list_del_rcu(&set->list);
318 ctx->table->use--;
319
320 return err;
321}
322
96518518
PM		 323/*
324 * Tables
325 */
326
327static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
328 const struct nlattr *nla)
329{
330 struct nft_table *table;
331
332 list_for_each_entry(table, &afi->tables, list) {
333 if (!nla_strcmp(nla, table->name))
334 return table;
335 }
336 return NULL;
337}
338
339static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
9370761c 340 const struct nlattr *nla)
96518518
PM		 341{
342 struct nft_table *table;
343
344 if (nla == NULL)
345 return ERR_PTR(-EINVAL);
346
347 table = nft_table_lookup(afi, nla);
348 if (table != NULL)
349 return table;
350
96518518
PM		 351 return ERR_PTR(-ENOENT);
352}
353
354static inline u64 nf_tables_alloc_handle(struct nft_table *table)
355{
356 return ++table->hgenerator;
357}
358
2a37d755 359static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
9370761c 360
2a37d755 361static const struct nf_chain_type *
baae3e62 362__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 363{
364 int i;
365
baae3e62 366 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 367 if (chain_type[family][i] != NULL &&
368 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 369 return chain_type[family][i];
9370761c 370 }
baae3e62 371 return NULL;
9370761c
PNA		 372}
373
2a37d755 374static const struct nf_chain_type *
baae3e62
PM		 375nf_tables_chain_type_lookup(const struct nft_af_info *afi,
376 const struct nlattr *nla,
377 bool autoload)
9370761c 378{
2a37d755 379 const struct nf_chain_type *type;
9370761c
PNA		 380
381 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 382 if (type != NULL)
383 return type;
9370761c 384#ifdef CONFIG_MODULES
93b0806f 385 if (autoload) {
9370761c 386 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 387 request_module("nft-chain-%u-%.*s", afi->family,
388 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 389 nfnl_lock(NFNL_SUBSYS_NFTABLES);
390 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 391 if (type != NULL)
392 return ERR_PTR(-EAGAIN);
9370761c
PNA		 393 }
394#endif
93b0806f 395 return ERR_PTR(-ENOENT);
9370761c
PNA		 396}
397
96518518 398static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 399 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
400 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 401 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 402};
403
84d7fce6
PNA		 404static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
405 u32 portid, u32 seq, int event, u32 flags,
406 int family, const struct nft_table *table)
96518518
PM		 407{
408 struct nlmsghdr *nlh;
409 struct nfgenmsg *nfmsg;
410
411 event |= NFNL_SUBSYS_NFTABLES << 8;
412 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
413 if (nlh == NULL)
414 goto nla_put_failure;
415
416 nfmsg = nlmsg_data(nlh);
417 nfmsg->nfgen_family = family;
418 nfmsg->version = NFNETLINK_V0;
84d7fce6 419 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 420
9ddf6323 421 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 422 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
423 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 424 goto nla_put_failure;
425
053c095a
JB		 426 nlmsg_end(skb, nlh);
427 return 0;
96518518
PM		 428
429nla_put_failure:
430 nlmsg_trim(skb, nlh);
431 return -1;
432}
433
35151d84 434static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 435{
436 struct sk_buff *skb;
96518518
PM		 437 int err;
438
128ad332
PNA		 439 if (!ctx->report &&
440 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 441 return 0;
442
443 err = -ENOBUFS;
444 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
445 if (skb == NULL)
446 goto err;
447
84d7fce6
PNA		 448 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
449 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 450 if (err < 0) {
451 kfree_skb(skb);
452 goto err;
453 }
454
128ad332
PNA		 455 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
456 ctx->report, GFP_KERNEL);
96518518 457err:
128ad332
PNA		 458 if (err < 0) {
459 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
460 err);
461 }
96518518
PM		 462 return err;
463}
464
465static int nf_tables_dump_tables(struct sk_buff *skb,
466 struct netlink_callback *cb)
467{
468 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
469 const struct nft_af_info *afi;
470 const struct nft_table *table;
471 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 472 struct net *net = sock_net(skb->sk);
96518518
PM		 473 int family = nfmsg->nfgen_family;
474
e688a7f8 475 rcu_read_lock();
38e029f1
PNA		 476 cb->seq = net->nft.base_seq;
477
e688a7f8 478 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 479 if (family != NFPROTO_UNSPEC && family != afi->family)
480 continue;
481
e688a7f8 482 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 483 if (idx < s_idx)
484 goto cont;
485 if (idx > s_idx)
486 memset(&cb->args[1], 0,
487 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 488 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 489 NETLINK_CB(cb->skb).portid,
490 cb->nlh->nlmsg_seq,
491 NFT_MSG_NEWTABLE,
492 NLM_F_MULTI,
493 afi->family, table) < 0)
494 goto done;
38e029f1
PNA		 495
496 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 497cont:
498 idx++;
499 }
500 }
501done:
e688a7f8 502 rcu_read_unlock();
96518518
PM		 503 cb->args[0] = idx;
504 return skb->len;
505}
506
507static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
508 const struct nlmsghdr *nlh,
509 const struct nlattr * const nla[])
510{
511 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
512 const struct nft_af_info *afi;
513 const struct nft_table *table;
514 struct sk_buff *skb2;
99633ab2 515 struct net *net = sock_net(skb->sk);
96518518
PM		 516 int family = nfmsg->nfgen_family;
517 int err;
518
519 if (nlh->nlmsg_flags & NLM_F_DUMP) {
520 struct netlink_dump_control c = {
521 .dump = nf_tables_dump_tables,
522 };
523 return netlink_dump_start(nlsk, skb, nlh, &c);
524 }
525
99633ab2 526 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 527 if (IS_ERR(afi))
528 return PTR_ERR(afi);
529
9370761c 530 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 531 if (IS_ERR(table))
532 return PTR_ERR(table);
55dd6f93
PNA		 533 if (table->flags & NFT_TABLE_INACTIVE)
534 return -ENOENT;
96518518
PM		 535
536 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
537 if (!skb2)
538 return -ENOMEM;
539
84d7fce6 540 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 541 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
542 family, table);
543 if (err < 0)
544 goto err;
545
546 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
547
548err:
549 kfree_skb(skb2);
550 return err;
551}
552
115a60b1
PM		 553static int nf_tables_table_enable(const struct nft_af_info *afi,
554 struct nft_table *table)
9ddf6323
PNA		 555{
556 struct nft_chain *chain;
557 int err, i = 0;
558
559 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 560 if (!(chain->flags & NFT_BASE_CHAIN))
561 continue;
562
115a60b1 563 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
9ddf6323
PNA		 564 if (err < 0)
565 goto err;
566
567 i++;
568 }
569 return 0;
570err:
571 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 572 if (!(chain->flags & NFT_BASE_CHAIN))
573 continue;
574
9ddf6323
PNA		 575 if (i-- <= 0)
576 break;
577
115a60b1 578 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
9ddf6323
PNA		 579 }
580 return err;
581}
582
f75edf5e 583static void nf_tables_table_disable(const struct nft_af_info *afi,
115a60b1 584 struct nft_table *table)
9ddf6323
PNA		 585{
586 struct nft_chain *chain;
587
d2012975
PNA		 588 list_for_each_entry(chain, &table->chains, list) {
589 if (chain->flags & NFT_BASE_CHAIN)
115a60b1
PM		 590 nf_unregister_hooks(nft_base_chain(chain)->ops,
591 afi->nops);
d2012975 592 }
9ddf6323
PNA		 593}
594
e1aaca93 595static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 596{
55dd6f93 597 struct nft_trans *trans;
e1aaca93 598 u32 flags;
55dd6f93 599 int ret = 0;
9ddf6323 600
e1aaca93
PNA		 601 if (!ctx->nla[NFTA_TABLE_FLAGS])
602 return 0;
9ddf6323 603
e1aaca93
PNA		 604 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
605 if (flags & ~NFT_TABLE_F_DORMANT)
606 return -EINVAL;
607
63283dd2
PNA		 608 if (flags == ctx->table->flags)
609 return 0;
610
55dd6f93
PNA		 611 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
612 sizeof(struct nft_trans_table));
613 if (trans == NULL)
614 return -ENOMEM;
9ddf6323 615
e1aaca93
PNA		 616 if ((flags & NFT_TABLE_F_DORMANT) &&
617 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 618 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 619 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
620 ctx->table->flags & NFT_TABLE_F_DORMANT) {
621 ret = nf_tables_table_enable(ctx->afi, ctx->table);
55dd6f93 622 if (ret >= 0) {
e1aaca93 623 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 624 nft_trans_table_enable(trans) = true;
9ddf6323 625 }
9ddf6323 626 }
e1aaca93
PNA		 627 if (ret < 0)
628 goto err;
9ddf6323 629
55dd6f93
PNA		 630 nft_trans_table_update(trans) = true;
631 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
632 return 0;
9ddf6323 633err:
55dd6f93 634 nft_trans_destroy(trans);
9ddf6323
PNA		 635 return ret;
636}
637
96518518
PM		 638static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
639 const struct nlmsghdr *nlh,
640 const struct nlattr * const nla[])
641{
642 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
643 const struct nlattr *name;
644 struct nft_af_info *afi;
645 struct nft_table *table;
99633ab2 646 struct net *net = sock_net(skb->sk);
96518518 647 int family = nfmsg->nfgen_family;
c5c1f975 648 u32 flags = 0;
e1aaca93 649 struct nft_ctx ctx;
55dd6f93 650 int err;
96518518 651
99633ab2 652 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 653 if (IS_ERR(afi))
654 return PTR_ERR(afi);
655
656 name = nla[NFTA_TABLE_NAME];
9370761c 657 table = nf_tables_table_lookup(afi, name);
96518518
PM		 658 if (IS_ERR(table)) {
659 if (PTR_ERR(table) != -ENOENT)
660 return PTR_ERR(table);
661 table = NULL;
662 }
663
664 if (table != NULL) {
55dd6f93
PNA		 665 if (table->flags & NFT_TABLE_INACTIVE)
666 return -ENOENT;
96518518
PM		 667 if (nlh->nlmsg_flags & NLM_F_EXCL)
668 return -EEXIST;
669 if (nlh->nlmsg_flags & NLM_F_REPLACE)
670 return -EOPNOTSUPP;
e1aaca93
PNA		 671
672 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
673 return nf_tables_updtable(&ctx);
96518518
PM		 674 }
675
c5c1f975
PM		 676 if (nla[NFTA_TABLE_FLAGS]) {
677 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
678 if (flags & ~NFT_TABLE_F_DORMANT)
679 return -EINVAL;
680 }
681
7047f9d0
PM		 682 if (!try_module_get(afi->owner))
683 return -EAFNOSUPPORT;
684
ffdb210e 685 err = -ENOMEM;
1cae565e 686 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e
PNA		 687 if (table == NULL)
688 goto err1;
96518518 689
1cae565e 690 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 691 INIT_LIST_HEAD(&table->chains);
20a69341 692 INIT_LIST_HEAD(&table->sets);
c5c1f975 693 table->flags = flags;
9ddf6323 694
55dd6f93
PNA		 695 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
696 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e
PNA		 697 if (err < 0)
698 goto err2;
699
e688a7f8 700 list_add_tail_rcu(&table->list, &afi->tables);
96518518 701 return 0;
ffdb210e
PNA		 702err2:
703 kfree(table);
704err1:
705 module_put(afi->owner);
706 return err;
96518518
PM		 707}
708
b9ac12ef
AB		 709static int nft_flush_table(struct nft_ctx *ctx)
710{
711 int err;
712 struct nft_chain *chain, *nc;
713 struct nft_set *set, *ns;
714
a2f18db0 715 list_for_each_entry(chain, &ctx->table->chains, list) {
b9ac12ef
AB		 716 ctx->chain = chain;
717
718 err = nft_delrule_by_chain(ctx);
719 if (err < 0)
720 goto out;
b9ac12ef
AB		 721 }
722
723 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
724 if (set->flags & NFT_SET_ANONYMOUS &&
725 !list_empty(&set->bindings))
726 continue;
727
728 err = nft_delset(ctx, set);
729 if (err < 0)
730 goto out;
731 }
732
a2f18db0
PNA		 733 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
734 ctx->chain = chain;
735
736 err = nft_delchain(ctx);
737 if (err < 0)
738 goto out;
739 }
740
b9ac12ef
AB		 741 err = nft_deltable(ctx);
742out:
743 return err;
744}
745
746static int nft_flush(struct nft_ctx *ctx, int family)
747{
748 struct nft_af_info *afi;
749 struct nft_table *table, *nt;
750 const struct nlattr * const *nla = ctx->nla;
751 int err = 0;
752
753 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
754 if (family != AF_UNSPEC && afi->family != family)
755 continue;
756
757 ctx->afi = afi;
758 list_for_each_entry_safe(table, nt, &afi->tables, list) {
759 if (nla[NFTA_TABLE_NAME] &&
760 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
761 continue;
762
763 ctx->table = table;
764
765 err = nft_flush_table(ctx);
766 if (err < 0)
767 goto out;
768 }
769 }
770out:
771 return err;
772}
773
96518518
PM		 774static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
775 const struct nlmsghdr *nlh,
776 const struct nlattr * const nla[])
777{
778 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
779 struct nft_af_info *afi;
780 struct nft_table *table;
99633ab2 781 struct net *net = sock_net(skb->sk);
ee01d542 782 int family = nfmsg->nfgen_family;
55dd6f93 783 struct nft_ctx ctx;
96518518 784
b9ac12ef
AB		 785 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
786 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
787 return nft_flush(&ctx, family);
788
99633ab2 789 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 790 if (IS_ERR(afi))
791 return PTR_ERR(afi);
792
9370761c 793 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 794 if (IS_ERR(table))
795 return PTR_ERR(table);
55dd6f93
PNA		 796 if (table->flags & NFT_TABLE_INACTIVE)
797 return -ENOENT;
96518518 798
b9ac12ef
AB		 799 ctx.afi = afi;
800 ctx.table = table;
55dd6f93 801
b9ac12ef 802 return nft_flush_table(&ctx);
96518518
PM		 803}
804
55dd6f93
PNA		 805static void nf_tables_table_destroy(struct nft_ctx *ctx)
806{
4fefee57
PNA		 807 BUG_ON(ctx->table->use > 0);
808
55dd6f93
PNA		 809 kfree(ctx->table);
810 module_put(ctx->afi->owner);
811}
812
2a37d755 813int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 814{
9370761c 815 int err = 0;
96518518
PM		 816
817 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 818 if (chain_type[ctype->family][ctype->type] != NULL) {
819 err = -EBUSY;
820 goto out;
96518518 821 }
9370761c
PNA		 822 chain_type[ctype->family][ctype->type] = ctype;
823out:
96518518
PM		 824 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
825 return err;
826}
9370761c 827EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 828
2a37d755 829void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 830{
96518518 831 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 832 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 833 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
834}
9370761c 835EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 836
837/*
838 * Chains
839 */
840
841static struct nft_chain *
842nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
843{
844 struct nft_chain *chain;
845
846 list_for_each_entry(chain, &table->chains, list) {
847 if (chain->handle == handle)
848 return chain;
849 }
850
851 return ERR_PTR(-ENOENT);
852}
853
854static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
855 const struct nlattr *nla)
856{
857 struct nft_chain *chain;
858
859 if (nla == NULL)
860 return ERR_PTR(-EINVAL);
861
862 list_for_each_entry(chain, &table->chains, list) {
863 if (!nla_strcmp(nla, chain->name))
864 return chain;
865 }
866
867 return ERR_PTR(-ENOENT);
868}
869
870static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
871 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
872 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
873 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
874 .len = NFT_CHAIN_MAXNAMELEN - 1 },
875 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 876 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 877 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 878 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 879};
880
881static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
882 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
883 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
884};
885
0ca743a5
PNA		 886static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
887{
888 struct nft_stats *cpu_stats, total;
889 struct nlattr *nest;
ce355e20
ED		 890 unsigned int seq;
891 u64 pkts, bytes;
0ca743a5
PNA		 892 int cpu;
893
894 memset(&total, 0, sizeof(total));
895 for_each_possible_cpu(cpu) {
896 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 897 do {
898 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
899 pkts = cpu_stats->pkts;
900 bytes = cpu_stats->bytes;
901 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
902 total.pkts += pkts;
903 total.bytes += bytes;
0ca743a5
PNA		 904 }
905 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
906 if (nest == NULL)
907 goto nla_put_failure;
908
909 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
910 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
911 goto nla_put_failure;
912
913 nla_nest_end(skb, nest);
914 return 0;
915
916nla_put_failure:
917 return -ENOSPC;
918}
919
84d7fce6
PNA		 920static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
921 u32 portid, u32 seq, int event, u32 flags,
922 int family, const struct nft_table *table,
96518518
PM		 923 const struct nft_chain *chain)
924{
925 struct nlmsghdr *nlh;
926 struct nfgenmsg *nfmsg;
927
928 event |= NFNL_SUBSYS_NFTABLES << 8;
929 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
930 if (nlh == NULL)
931 goto nla_put_failure;
932
933 nfmsg = nlmsg_data(nlh);
934 nfmsg->nfgen_family = family;
935 nfmsg->version = NFNETLINK_V0;
84d7fce6 936 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 937
938 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
939 goto nla_put_failure;
940 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
941 goto nla_put_failure;
942 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
943 goto nla_put_failure;
944
945 if (chain->flags & NFT_BASE_CHAIN) {
0ca743a5 946 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 947 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 948 struct nlattr *nest;
949
950 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 951 if (nest == NULL)
952 goto nla_put_failure;
953 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
954 goto nla_put_failure;
955 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
956 goto nla_put_failure;
957 nla_nest_end(skb, nest);
9370761c 958
0ca743a5
PNA		 959 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
960 htonl(basechain->policy)))
961 goto nla_put_failure;
962
baae3e62
PM		 963 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
964 goto nla_put_failure;
0ca743a5
PNA		 965
966 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
967 goto nla_put_failure;
96518518
PM		 968 }
969
0ca743a5
PNA		 970 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
971 goto nla_put_failure;
972
053c095a
JB		 973 nlmsg_end(skb, nlh);
974 return 0;
96518518
PM		 975
976nla_put_failure:
977 nlmsg_trim(skb, nlh);
978 return -1;
979}
980
35151d84 981static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 982{
983 struct sk_buff *skb;
96518518
PM		 984 int err;
985
128ad332
PNA		 986 if (!ctx->report &&
987 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 988 return 0;
989
990 err = -ENOBUFS;
991 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
992 if (skb == NULL)
993 goto err;
994
84d7fce6
PNA		 995 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
996 event, 0, ctx->afi->family, ctx->table,
35151d84 997 ctx->chain);
96518518
PM		 998 if (err < 0) {
999 kfree_skb(skb);
1000 goto err;
1001 }
1002
128ad332
PNA		 1003 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1004 ctx->report, GFP_KERNEL);
96518518 1005err:
128ad332
PNA		 1006 if (err < 0) {
1007 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1008 err);
1009 }
96518518
PM		 1010 return err;
1011}
1012
1013static int nf_tables_dump_chains(struct sk_buff *skb,
1014 struct netlink_callback *cb)
1015{
1016 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1017 const struct nft_af_info *afi;
1018 const struct nft_table *table;
1019 const struct nft_chain *chain;
1020 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1021 struct net *net = sock_net(skb->sk);
96518518
PM		 1022 int family = nfmsg->nfgen_family;
1023
e688a7f8 1024 rcu_read_lock();
38e029f1
PNA		 1025 cb->seq = net->nft.base_seq;
1026
e688a7f8 1027 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1028 if (family != NFPROTO_UNSPEC && family != afi->family)
1029 continue;
1030
e688a7f8
PNA		 1031 list_for_each_entry_rcu(table, &afi->tables, list) {
1032 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1033 if (idx < s_idx)
1034 goto cont;
1035 if (idx > s_idx)
1036 memset(&cb->args[1], 0,
1037 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6
PNA		 1038 if (nf_tables_fill_chain_info(skb, net,
1039 NETLINK_CB(cb->skb).portid,
96518518
PM		 1040 cb->nlh->nlmsg_seq,
1041 NFT_MSG_NEWCHAIN,
1042 NLM_F_MULTI,
1043 afi->family, table, chain) < 0)
1044 goto done;
38e029f1
PNA		 1045
1046 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1047cont:
1048 idx++;
1049 }
1050 }
1051 }
1052done:
e688a7f8 1053 rcu_read_unlock();
96518518
PM		 1054 cb->args[0] = idx;
1055 return skb->len;
1056}
1057
96518518
PM		 1058static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1059 const struct nlmsghdr *nlh,
1060 const struct nlattr * const nla[])
1061{
1062 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1063 const struct nft_af_info *afi;
1064 const struct nft_table *table;
1065 const struct nft_chain *chain;
1066 struct sk_buff *skb2;
99633ab2 1067 struct net *net = sock_net(skb->sk);
96518518
PM		 1068 int family = nfmsg->nfgen_family;
1069 int err;
1070
1071 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1072 struct netlink_dump_control c = {
1073 .dump = nf_tables_dump_chains,
1074 };
1075 return netlink_dump_start(nlsk, skb, nlh, &c);
1076 }
1077
99633ab2 1078 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1079 if (IS_ERR(afi))
1080 return PTR_ERR(afi);
1081
9370761c 1082 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1083 if (IS_ERR(table))
1084 return PTR_ERR(table);
55dd6f93
PNA		 1085 if (table->flags & NFT_TABLE_INACTIVE)
1086 return -ENOENT;
96518518
PM		 1087
1088 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1089 if (IS_ERR(chain))
1090 return PTR_ERR(chain);
91c7b38d
PNA		 1091 if (chain->flags & NFT_CHAIN_INACTIVE)
1092 return -ENOENT;
96518518
PM		 1093
1094 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1095 if (!skb2)
1096 return -ENOMEM;
1097
84d7fce6 1098 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1099 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1100 family, table, chain);
1101 if (err < 0)
1102 goto err;
1103
1104 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1105
1106err:
1107 kfree_skb(skb2);
1108 return err;
1109}
1110
0ca743a5
PNA		 1111static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1112 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1113 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1114};
1115
ff3cd7b3 1116static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1117{
1118 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1119 struct nft_stats __percpu *newstats;
1120 struct nft_stats *stats;
1121 int err;
1122
1123 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1124 if (err < 0)
ff3cd7b3 1125 return ERR_PTR(err);
0ca743a5
PNA		 1126
1127 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1128 return ERR_PTR(-EINVAL);
0ca743a5 1129
ce355e20 1130 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1131 if (newstats == NULL)
ff3cd7b3 1132 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1133
1134 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1135 * are not exposed to userspace.
1136 */
e8781f70 1137 preempt_disable();
0ca743a5
PNA		 1138 stats = this_cpu_ptr(newstats);
1139 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1140 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1141 preempt_enable();
0ca743a5 1142
ff3cd7b3
PNA		 1143 return newstats;
1144}
1145
1146static void nft_chain_stats_replace(struct nft_base_chain *chain,
1147 struct nft_stats __percpu *newstats)
1148{
b88825de
PNA		 1149 if (newstats == NULL)
1150 return;
1151
0ca743a5 1152 if (chain->stats) {
0ca743a5 1153 struct nft_stats __percpu *oldstats =
67a8fc27 1154 nft_dereference(chain->stats);
0ca743a5
PNA		 1155
1156 rcu_assign_pointer(chain->stats, newstats);
1157 synchronize_rcu();
1158 free_percpu(oldstats);
1159 } else
1160 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1161}
1162
91c7b38d
PNA		 1163static void nf_tables_chain_destroy(struct nft_chain *chain)
1164{
1165 BUG_ON(chain->use > 0);
1166
1167 if (chain->flags & NFT_BASE_CHAIN) {
1168 module_put(nft_base_chain(chain)->type->owner);
1169 free_percpu(nft_base_chain(chain)->stats);
1170 kfree(nft_base_chain(chain));
1171 } else {
1172 kfree(chain);
1173 }
1174}
1175
96518518
PM		 1176static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1177 const struct nlmsghdr *nlh,
1178 const struct nlattr * const nla[])
1179{
1180 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1181 const struct nlattr * uninitialized_var(name);
7c95f6d8 1182 struct nft_af_info *afi;
96518518
PM		 1183 struct nft_table *table;
1184 struct nft_chain *chain;
0ca743a5 1185 struct nft_base_chain *basechain = NULL;
96518518 1186 struct nlattr *ha[NFTA_HOOK_MAX + 1];
99633ab2 1187 struct net *net = sock_net(skb->sk);
96518518 1188 int family = nfmsg->nfgen_family;
57de2a0c 1189 u8 policy = NF_ACCEPT;
96518518 1190 u64 handle = 0;
115a60b1 1191 unsigned int i;
ff3cd7b3 1192 struct nft_stats __percpu *stats;
96518518
PM		 1193 int err;
1194 bool create;
91c7b38d 1195 struct nft_ctx ctx;
96518518
PM		 1196
1197 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1198
99633ab2 1199 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1200 if (IS_ERR(afi))
1201 return PTR_ERR(afi);
1202
9370761c 1203 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1204 if (IS_ERR(table))
1205 return PTR_ERR(table);
1206
96518518
PM		 1207 chain = NULL;
1208 name = nla[NFTA_CHAIN_NAME];
1209
1210 if (nla[NFTA_CHAIN_HANDLE]) {
1211 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1212 chain = nf_tables_chain_lookup_byhandle(table, handle);
1213 if (IS_ERR(chain))
1214 return PTR_ERR(chain);
1215 } else {
1216 chain = nf_tables_chain_lookup(table, name);
1217 if (IS_ERR(chain)) {
1218 if (PTR_ERR(chain) != -ENOENT)
1219 return PTR_ERR(chain);
1220 chain = NULL;
1221 }
1222 }
1223
57de2a0c
PM		 1224 if (nla[NFTA_CHAIN_POLICY]) {
1225 if ((chain != NULL &&
d6b6cb1d
PNA		 1226 !(chain->flags & NFT_BASE_CHAIN)))
1227 return -EOPNOTSUPP;
1228
1229 if (chain == NULL &&
57de2a0c
PM		 1230 nla[NFTA_CHAIN_HOOK] == NULL)
1231 return -EOPNOTSUPP;
1232
8f46df18 1233 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1234 switch (policy) {
1235 case NF_DROP:
1236 case NF_ACCEPT:
1237 break;
1238 default:
1239 return -EINVAL;
1240 }
1241 }
1242
96518518 1243 if (chain != NULL) {
91c7b38d
PNA		 1244 struct nft_stats *stats = NULL;
1245 struct nft_trans *trans;
1246
1247 if (chain->flags & NFT_CHAIN_INACTIVE)
1248 return -ENOENT;
96518518
PM		 1249 if (nlh->nlmsg_flags & NLM_F_EXCL)
1250 return -EEXIST;
1251 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1252 return -EOPNOTSUPP;
1253
1254 if (nla[NFTA_CHAIN_HANDLE] && name &&
1255 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1256 return -EEXIST;
1257
0ca743a5
PNA		 1258 if (nla[NFTA_CHAIN_COUNTERS]) {
1259 if (!(chain->flags & NFT_BASE_CHAIN))
1260 return -EOPNOTSUPP;
1261
ff3cd7b3
PNA		 1262 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1263 if (IS_ERR(stats))
1264 return PTR_ERR(stats);
0ca743a5
PNA		 1265 }
1266
91c7b38d
PNA		 1267 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1268 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1269 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1270 if (trans == NULL) {
1271 free_percpu(stats);
91c7b38d 1272 return -ENOMEM;
f5553c19 1273 }
4401a862 1274
91c7b38d
PNA		 1275 nft_trans_chain_stats(trans) = stats;
1276 nft_trans_chain_update(trans) = true;
4401a862 1277
91c7b38d
PNA		 1278 if (nla[NFTA_CHAIN_POLICY])
1279 nft_trans_chain_policy(trans) = policy;
1280 else
1281 nft_trans_chain_policy(trans) = -1;
96518518 1282
91c7b38d
PNA		 1283 if (nla[NFTA_CHAIN_HANDLE] && name) {
1284 nla_strlcpy(nft_trans_chain_name(trans), name,
1285 NFT_CHAIN_MAXNAMELEN);
1286 }
1287 list_add_tail(&trans->list, &net->nft.commit_list);
1288 return 0;
96518518
PM		 1289 }
1290
75820676
PM		 1291 if (table->use == UINT_MAX)
1292 return -EOVERFLOW;
1293
96518518 1294 if (nla[NFTA_CHAIN_HOOK]) {
2a37d755 1295 const struct nf_chain_type *type;
96518518 1296 struct nf_hook_ops *ops;
9370761c 1297 nf_hookfn *hookfn;
115a60b1 1298 u32 hooknum, priority;
9370761c 1299
baae3e62 1300 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
9370761c
PNA		 1301 if (nla[NFTA_CHAIN_TYPE]) {
1302 type = nf_tables_chain_type_lookup(afi,
1303 nla[NFTA_CHAIN_TYPE],
1304 create);
93b0806f
PM		 1305 if (IS_ERR(type))
1306 return PTR_ERR(type);
9370761c 1307 }
96518518
PM		 1308
1309 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1310 nft_hook_policy);
1311 if (err < 0)
1312 return err;
1313 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1314 ha[NFTA_HOOK_PRIORITY] == NULL)
1315 return -EINVAL;
9370761c
PNA		 1316
1317 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1318 if (hooknum >= afi->nhooks)
96518518 1319 return -EINVAL;
115a60b1 1320 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
96518518 1321
baae3e62 1322 if (!(type->hook_mask & (1 << hooknum)))
9370761c 1323 return -EOPNOTSUPP;
fa2c1de0 1324 if (!try_module_get(type->owner))
baae3e62 1325 return -ENOENT;
fa2c1de0 1326 hookfn = type->hooks[hooknum];
9370761c 1327
96518518 1328 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19
PNA		 1329 if (basechain == NULL) {
1330 module_put(type->owner);
96518518 1331 return -ENOMEM;
f5553c19 1332 }
9370761c 1333
4401a862 1334 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1335 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1336 if (IS_ERR(stats)) {
fa2c1de0 1337 module_put(type->owner);
4401a862 1338 kfree(basechain);
ff3cd7b3 1339 return PTR_ERR(stats);
4401a862 1340 }
ff3cd7b3 1341 basechain->stats = stats;
4401a862 1342 } else {
ce355e20 1343 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1344 if (stats == NULL) {
fa2c1de0 1345 module_put(type->owner);
4401a862 1346 kfree(basechain);
c123bb71 1347 return -ENOMEM;
4401a862 1348 }
ff3cd7b3 1349 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1350 }
1351
5ebb335d 1352 write_pnet(&basechain->pnet, net);
9370761c 1353 basechain->type = type;
96518518
PM		 1354 chain = &basechain->chain;
1355
115a60b1
PM		 1356 for (i = 0; i < afi->nops; i++) {
1357 ops = &basechain->ops[i];
1358 ops->pf = family;
1359 ops->owner = afi->owner;
1360 ops->hooknum = hooknum;
1361 ops->priority = priority;
1362 ops->priv = chain;
1363 ops->hook = afi->hooks[ops->hooknum];
1364 if (hookfn)
1365 ops->hook = hookfn;
1366 if (afi->hook_ops_init)
1367 afi->hook_ops_init(ops, i);
1368 }
96518518
PM		 1369
1370 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1371 basechain->policy = policy;
96518518
PM		 1372 } else {
1373 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1374 if (chain == NULL)
1375 return -ENOMEM;
1376 }
1377
1378 INIT_LIST_HEAD(&chain->rules);
1379 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1380 chain->table = table;
96518518
PM		 1381 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1382
9ddf6323
PNA		 1383 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1384 chain->flags & NFT_BASE_CHAIN) {
115a60b1 1385 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
91c7b38d
PNA		 1386 if (err < 0)
1387 goto err1;
0ca743a5 1388 }
96518518 1389
91c7b38d
PNA		 1390 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1391 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1392 if (err < 0)
1393 goto err2;
96518518 1394
4fefee57 1395 table->use++;
e688a7f8 1396 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1397 return 0;
1398err2:
c5598794 1399 nf_tables_unregister_hooks(table, chain, afi->nops);
91c7b38d
PNA		 1400err1:
1401 nf_tables_chain_destroy(chain);
1402 return err;
96518518
PM		 1403}
1404
1405static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1406 const struct nlmsghdr *nlh,
1407 const struct nlattr * const nla[])
1408{
1409 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 1410 struct nft_af_info *afi;
96518518
PM		 1411 struct nft_table *table;
1412 struct nft_chain *chain;
99633ab2 1413 struct net *net = sock_net(skb->sk);
96518518 1414 int family = nfmsg->nfgen_family;
91c7b38d 1415 struct nft_ctx ctx;
96518518 1416
99633ab2 1417 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1418 if (IS_ERR(afi))
1419 return PTR_ERR(afi);
1420
9370761c 1421 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1422 if (IS_ERR(table))
1423 return PTR_ERR(table);
55dd6f93
PNA		 1424 if (table->flags & NFT_TABLE_INACTIVE)
1425 return -ENOENT;
96518518
PM		 1426
1427 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1428 if (IS_ERR(chain))
1429 return PTR_ERR(chain);
91c7b38d
PNA		 1430 if (chain->flags & NFT_CHAIN_INACTIVE)
1431 return -ENOENT;
4fefee57 1432 if (chain->use > 0)
96518518
PM		 1433 return -EBUSY;
1434
91c7b38d 1435 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
0165d932 1436
ee01d542 1437 return nft_delchain(&ctx);
96518518
PM		 1438}
1439
96518518
PM		 1440/*
1441 * Expressions
1442 */
1443
1444/**
ef1f7df9
PM		 1445 * nft_register_expr - register nf_tables expr type
1446 * @ops: expr type
96518518 1447 *
ef1f7df9 1448 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1449 * success or a negative errno code otherwise.
1450 */
ef1f7df9 1451int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1452{
1453 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1454 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1455 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1456 else
e688a7f8 1457 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1458 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1459 return 0;
1460}
1461EXPORT_SYMBOL_GPL(nft_register_expr);
1462
1463/**
ef1f7df9
PM		 1464 * nft_unregister_expr - unregister nf_tables expr type
1465 * @ops: expr type
96518518 1466 *
ef1f7df9 1467 * Unregisters the expr typefor use with nf_tables.
96518518 1468 */
ef1f7df9 1469void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1470{
1471 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1472 list_del_rcu(&type->list);
96518518
PM		 1473 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1474}
1475EXPORT_SYMBOL_GPL(nft_unregister_expr);
1476
64d46806
PM		 1477static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1478 struct nlattr *nla)
96518518 1479{
ef1f7df9 1480 const struct nft_expr_type *type;
96518518 1481
ef1f7df9 1482 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1483 if (!nla_strcmp(nla, type->name) &&
1484 (!type->family || type->family == family))
ef1f7df9 1485 return type;
96518518
PM		 1486 }
1487 return NULL;
1488}
1489
64d46806
PM		 1490static const struct nft_expr_type *nft_expr_type_get(u8 family,
1491 struct nlattr *nla)
96518518 1492{
ef1f7df9 1493 const struct nft_expr_type *type;
96518518
PM		 1494
1495 if (nla == NULL)
1496 return ERR_PTR(-EINVAL);
1497
64d46806 1498 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1499 if (type != NULL && try_module_get(type->owner))
1500 return type;
96518518
PM		 1501
1502#ifdef CONFIG_MODULES
ef1f7df9 1503 if (type == NULL) {
64d46806
PM		 1504 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1505 request_module("nft-expr-%u-%.*s", family,
1506 nla_len(nla), (char *)nla_data(nla));
1507 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1508 if (__nft_expr_type_get(family, nla))
1509 return ERR_PTR(-EAGAIN);
1510
96518518
PM		 1511 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1512 request_module("nft-expr-%.*s",
1513 nla_len(nla), (char *)nla_data(nla));
1514 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1515 if (__nft_expr_type_get(family, nla))
96518518
PM		 1516 return ERR_PTR(-EAGAIN);
1517 }
1518#endif
1519 return ERR_PTR(-ENOENT);
1520}
1521
1522static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1523 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1524 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1525};
1526
1527static int nf_tables_fill_expr_info(struct sk_buff *skb,
1528 const struct nft_expr *expr)
1529{
ef1f7df9 1530 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1531 goto nla_put_failure;
1532
1533 if (expr->ops->dump) {
1534 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1535 if (data == NULL)
1536 goto nla_put_failure;
1537 if (expr->ops->dump(skb, expr) < 0)
1538 goto nla_put_failure;
1539 nla_nest_end(skb, data);
1540 }
1541
1542 return skb->len;
1543
1544nla_put_failure:
1545 return -1;
1546};
1547
1548struct nft_expr_info {
1549 const struct nft_expr_ops *ops;
ef1f7df9 1550 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1551};
1552
0ca743a5
PNA		 1553static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1554 const struct nlattr *nla,
96518518
PM		 1555 struct nft_expr_info *info)
1556{
ef1f7df9 1557 const struct nft_expr_type *type;
96518518 1558 const struct nft_expr_ops *ops;
ef1f7df9 1559 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1560 int err;
1561
ef1f7df9 1562 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1563 if (err < 0)
1564 return err;
1565
64d46806 1566 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1567 if (IS_ERR(type))
1568 return PTR_ERR(type);
1569
1570 if (tb[NFTA_EXPR_DATA]) {
1571 err = nla_parse_nested(info->tb, type->maxattr,
1572 tb[NFTA_EXPR_DATA], type->policy);
1573 if (err < 0)
1574 goto err1;
1575 } else
1576 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1577
1578 if (type->select_ops != NULL) {
0ca743a5
PNA		 1579 ops = type->select_ops(ctx,
1580 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1581 if (IS_ERR(ops)) {
1582 err = PTR_ERR(ops);
1583 goto err1;
1584 }
1585 } else
1586 ops = type->ops;
1587
96518518
PM		 1588 info->ops = ops;
1589 return 0;
ef1f7df9
PM		 1590
1591err1:
1592 module_put(type->owner);
1593 return err;
96518518
PM		 1594}
1595
1596static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1597 const struct nft_expr_info *info,
96518518
PM		 1598 struct nft_expr *expr)
1599{
1600 const struct nft_expr_ops *ops = info->ops;
1601 int err;
1602
1603 expr->ops = ops;
1604 if (ops->init) {
ef1f7df9 1605 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1606 if (err < 0)
1607 goto err1;
1608 }
1609
96518518
PM		 1610 return 0;
1611
1612err1:
1613 expr->ops = NULL;
1614 return err;
1615}
1616
62472bce
PM		 1617static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1618 struct nft_expr *expr)
96518518
PM		 1619{
1620 if (expr->ops->destroy)
62472bce 1621 expr->ops->destroy(ctx, expr);
ef1f7df9 1622 module_put(expr->ops->type->owner);
96518518
PM		 1623}
1624
1625/*
1626 * Rules
1627 */
1628
1629static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1630 u64 handle)
1631{
1632 struct nft_rule *rule;
1633
1634 // FIXME: this sucks
1635 list_for_each_entry(rule, &chain->rules, list) {
1636 if (handle == rule->handle)
1637 return rule;
1638 }
1639
1640 return ERR_PTR(-ENOENT);
1641}
1642
1643static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1644 const struct nlattr *nla)
1645{
1646 if (nla == NULL)
1647 return ERR_PTR(-EINVAL);
1648
1649 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1650}
1651
1652static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1653 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1654 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1655 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1656 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1657 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1658 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1659 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1660 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1661 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1662};
1663
84d7fce6
PNA		 1664static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1665 u32 portid, u32 seq, int event,
1666 u32 flags, int family,
96518518
PM		 1667 const struct nft_table *table,
1668 const struct nft_chain *chain,
1669 const struct nft_rule *rule)
1670{
1671 struct nlmsghdr *nlh;
1672 struct nfgenmsg *nfmsg;
1673 const struct nft_expr *expr, *next;
1674 struct nlattr *list;
5e948466
EL		 1675 const struct nft_rule *prule;
1676 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1677
5e948466 1678 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1679 flags);
1680 if (nlh == NULL)
1681 goto nla_put_failure;
1682
1683 nfmsg = nlmsg_data(nlh);
1684 nfmsg->nfgen_family = family;
1685 nfmsg->version = NFNETLINK_V0;
84d7fce6 1686 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1687
1688 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1689 goto nla_put_failure;
1690 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1691 goto nla_put_failure;
1692 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1693 goto nla_put_failure;
1694
5e948466
EL		 1695 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1696 prule = list_entry(rule->list.prev, struct nft_rule, list);
1697 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1698 cpu_to_be64(prule->handle)))
1699 goto nla_put_failure;
1700 }
1701
96518518
PM		 1702 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1703 if (list == NULL)
1704 goto nla_put_failure;
1705 nft_rule_for_each_expr(expr, next, rule) {
1706 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1707 if (elem == NULL)
1708 goto nla_put_failure;
1709 if (nf_tables_fill_expr_info(skb, expr) < 0)
1710 goto nla_put_failure;
1711 nla_nest_end(skb, elem);
1712 }
1713 nla_nest_end(skb, list);
1714
86f1ec32
PM		 1715 if (rule->udata) {
1716 struct nft_userdata *udata = nft_userdata(rule);
1717 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1718 udata->data) < 0)
1719 goto nla_put_failure;
1720 }
0768b3b3 1721
053c095a
JB		 1722 nlmsg_end(skb, nlh);
1723 return 0;
96518518
PM		 1724
1725nla_put_failure:
1726 nlmsg_trim(skb, nlh);
1727 return -1;
1728}
1729
35151d84 1730static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1731 const struct nft_rule *rule,
35151d84 1732 int event)
96518518
PM		 1733{
1734 struct sk_buff *skb;
96518518
PM		 1735 int err;
1736
128ad332
PNA		 1737 if (!ctx->report &&
1738 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1739 return 0;
1740
1741 err = -ENOBUFS;
1742 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1743 if (skb == NULL)
1744 goto err;
1745
84d7fce6
PNA		 1746 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1747 event, 0, ctx->afi->family, ctx->table,
35151d84 1748 ctx->chain, rule);
96518518
PM		 1749 if (err < 0) {
1750 kfree_skb(skb);
1751 goto err;
1752 }
1753
128ad332
PNA		 1754 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1755 ctx->report, GFP_KERNEL);
96518518 1756err:
128ad332
PNA		 1757 if (err < 0) {
1758 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1759 err);
1760 }
96518518
PM		 1761 return err;
1762}
1763
1764static int nf_tables_dump_rules(struct sk_buff *skb,
1765 struct netlink_callback *cb)
1766{
1767 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1768 const struct nft_af_info *afi;
1769 const struct nft_table *table;
1770 const struct nft_chain *chain;
1771 const struct nft_rule *rule;
1772 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1773 struct net *net = sock_net(skb->sk);
96518518
PM		 1774 int family = nfmsg->nfgen_family;
1775
e688a7f8 1776 rcu_read_lock();
38e029f1
PNA		 1777 cb->seq = net->nft.base_seq;
1778
e688a7f8 1779 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1780 if (family != NFPROTO_UNSPEC && family != afi->family)
1781 continue;
1782
e688a7f8
PNA		 1783 list_for_each_entry_rcu(table, &afi->tables, list) {
1784 list_for_each_entry_rcu(chain, &table->chains, list) {
1785 list_for_each_entry_rcu(rule, &chain->rules, list) {
0628b123
PNA		 1786 if (!nft_rule_is_active(net, rule))
1787 goto cont;
96518518
PM		 1788 if (idx < s_idx)
1789 goto cont;
1790 if (idx > s_idx)
1791 memset(&cb->args[1], 0,
1792 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 1793 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 1794 cb->nlh->nlmsg_seq,
1795 NFT_MSG_NEWRULE,
1796 NLM_F_MULTI | NLM_F_APPEND,
1797 afi->family, table, chain, rule) < 0)
1798 goto done;
38e029f1
PNA		 1799
1800 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1801cont:
1802 idx++;
1803 }
1804 }
1805 }
1806 }
1807done:
e688a7f8
PNA		 1808 rcu_read_unlock();
1809
96518518
PM		 1810 cb->args[0] = idx;
1811 return skb->len;
1812}
1813
1814static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1815 const struct nlmsghdr *nlh,
1816 const struct nlattr * const nla[])
1817{
1818 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1819 const struct nft_af_info *afi;
1820 const struct nft_table *table;
1821 const struct nft_chain *chain;
1822 const struct nft_rule *rule;
1823 struct sk_buff *skb2;
99633ab2 1824 struct net *net = sock_net(skb->sk);
96518518
PM		 1825 int family = nfmsg->nfgen_family;
1826 int err;
1827
1828 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1829 struct netlink_dump_control c = {
1830 .dump = nf_tables_dump_rules,
1831 };
1832 return netlink_dump_start(nlsk, skb, nlh, &c);
1833 }
1834
99633ab2 1835 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1836 if (IS_ERR(afi))
1837 return PTR_ERR(afi);
1838
9370761c 1839 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1840 if (IS_ERR(table))
1841 return PTR_ERR(table);
55dd6f93
PNA		 1842 if (table->flags & NFT_TABLE_INACTIVE)
1843 return -ENOENT;
96518518
PM		 1844
1845 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1846 if (IS_ERR(chain))
1847 return PTR_ERR(chain);
91c7b38d
PNA		 1848 if (chain->flags & NFT_CHAIN_INACTIVE)
1849 return -ENOENT;
96518518
PM		 1850
1851 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1852 if (IS_ERR(rule))
1853 return PTR_ERR(rule);
1854
1855 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1856 if (!skb2)
1857 return -ENOMEM;
1858
84d7fce6 1859 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1860 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1861 family, table, chain, rule);
1862 if (err < 0)
1863 goto err;
1864
1865 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1866
1867err:
1868 kfree_skb(skb2);
1869 return err;
1870}
1871
62472bce
PM		 1872static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1873 struct nft_rule *rule)
96518518 1874{
96518518
PM		 1875 struct nft_expr *expr;
1876
1877 /*
1878 * Careful: some expressions might not be initialized in case this
1879 * is called on error from nf_tables_newrule().
1880 */
1881 expr = nft_expr_first(rule);
1882 while (expr->ops && expr != nft_expr_last(rule)) {
62472bce 1883 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 1884 expr = nft_expr_next(expr);
1885 }
1886 kfree(rule);
1887}
1888
1081d11b
PNA		 1889#define NFT_RULE_MAXEXPRS 128
1890
1891static struct nft_expr_info *info;
1892
96518518
PM		 1893static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1894 const struct nlmsghdr *nlh,
1895 const struct nlattr * const nla[])
1896{
1897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 1898 struct nft_af_info *afi;
99633ab2 1899 struct net *net = sock_net(skb->sk);
96518518
PM		 1900 struct nft_table *table;
1901 struct nft_chain *chain;
1902 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 1903 struct nft_userdata *udata;
1081d11b 1904 struct nft_trans *trans = NULL;
96518518
PM		 1905 struct nft_expr *expr;
1906 struct nft_ctx ctx;
1907 struct nlattr *tmp;
86f1ec32 1908 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 1909 int err, rem;
1910 bool create;
5e948466 1911 u64 handle, pos_handle;
96518518
PM		 1912
1913 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1914
99633ab2 1915 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 1916 if (IS_ERR(afi))
1917 return PTR_ERR(afi);
1918
9370761c 1919 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1920 if (IS_ERR(table))
1921 return PTR_ERR(table);
1922
1923 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1924 if (IS_ERR(chain))
1925 return PTR_ERR(chain);
1926
1927 if (nla[NFTA_RULE_HANDLE]) {
1928 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1929 rule = __nf_tables_rule_lookup(chain, handle);
1930 if (IS_ERR(rule))
1931 return PTR_ERR(rule);
1932
1933 if (nlh->nlmsg_flags & NLM_F_EXCL)
1934 return -EEXIST;
1935 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1936 old_rule = rule;
1937 else
1938 return -EOPNOTSUPP;
1939 } else {
1940 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1941 return -EINVAL;
1942 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 1943
1944 if (chain->use == UINT_MAX)
1945 return -EOVERFLOW;
96518518
PM		 1946 }
1947
5e948466
EL		 1948 if (nla[NFTA_RULE_POSITION]) {
1949 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1950 return -EOPNOTSUPP;
1951
1952 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1953 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1954 if (IS_ERR(old_rule))
1955 return PTR_ERR(old_rule);
1956 }
1957
0ca743a5
PNA		 1958 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1959
96518518
PM		 1960 n = 0;
1961 size = 0;
1962 if (nla[NFTA_RULE_EXPRESSIONS]) {
1963 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1964 err = -EINVAL;
1965 if (nla_type(tmp) != NFTA_LIST_ELEM)
1966 goto err1;
1967 if (n == NFT_RULE_MAXEXPRS)
1968 goto err1;
0ca743a5 1969 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 1970 if (err < 0)
1971 goto err1;
1972 size += info[n].ops->size;
1973 n++;
1974 }
1975 }
9889840f
PM		 1976 /* Check for overflow of dlen field */
1977 err = -EFBIG;
1978 if (size >= 1 << 12)
1979 goto err1;
96518518 1980
86f1ec32 1981 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 1982 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 1983 if (ulen > 0)
1984 usize = sizeof(struct nft_userdata) + ulen;
1985 }
0768b3b3 1986
96518518 1987 err = -ENOMEM;
86f1ec32 1988 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 1989 if (rule == NULL)
1990 goto err1;
1991
0628b123
PNA		 1992 nft_rule_activate_next(net, rule);
1993
96518518
PM		 1994 rule->handle = handle;
1995 rule->dlen = size;
86f1ec32 1996 rule->udata = ulen ? 1 : 0;
0768b3b3 1997
86f1ec32
PM		 1998 if (ulen) {
1999 udata = nft_userdata(rule);
2000 udata->len = ulen - 1;
2001 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2002 }
96518518 2003
96518518
PM		 2004 expr = nft_expr_first(rule);
2005 for (i = 0; i < n; i++) {
2006 err = nf_tables_newexpr(&ctx, &info[i], expr);
2007 if (err < 0)
2008 goto err2;
ef1f7df9 2009 info[i].ops = NULL;
96518518
PM		 2010 expr = nft_expr_next(expr);
2011 }
2012
96518518 2013 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
0628b123 2014 if (nft_rule_is_active_next(net, old_rule)) {
ac904ac8 2015 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2016 old_rule);
1081d11b 2017 if (trans == NULL) {
0628b123
PNA		 2018 err = -ENOMEM;
2019 goto err2;
2020 }
ee01d542 2021 nft_rule_deactivate_next(net, old_rule);
ac34b861 2022 chain->use--;
5bc5c307 2023 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2024 } else {
2025 err = -ENOENT;
2026 goto err2;
2027 }
96518518 2028 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2029 if (old_rule)
2030 list_add_rcu(&rule->list, &old_rule->list);
2031 else
2032 list_add_tail_rcu(&rule->list, &chain->rules);
2033 else {
2034 if (old_rule)
2035 list_add_tail_rcu(&rule->list, &old_rule->list);
2036 else
2037 list_add_rcu(&rule->list, &chain->rules);
2038 }
96518518 2039
b380e5c7 2040 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2041 err = -ENOMEM;
2042 goto err3;
2043 }
4fefee57 2044 chain->use++;
96518518
PM		 2045 return 0;
2046
0628b123
PNA		 2047err3:
2048 list_del_rcu(&rule->list);
96518518 2049err2:
62472bce 2050 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2051err1:
2052 for (i = 0; i < n; i++) {
2053 if (info[i].ops != NULL)
ef1f7df9 2054 module_put(info[i].ops->type->owner);
96518518
PM		 2055 }
2056 return err;
2057}
2058
2059static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2060 const struct nlmsghdr *nlh,
2061 const struct nlattr * const nla[])
2062{
2063 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2064 struct nft_af_info *afi;
99633ab2 2065 struct net *net = sock_net(skb->sk);
7c95f6d8 2066 struct nft_table *table;
cf9dc09d
PNA		 2067 struct nft_chain *chain = NULL;
2068 struct nft_rule *rule;
0628b123
PNA		 2069 int family = nfmsg->nfgen_family, err = 0;
2070 struct nft_ctx ctx;
96518518 2071
99633ab2 2072 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2073 if (IS_ERR(afi))
2074 return PTR_ERR(afi);
2075
9370761c 2076 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2077 if (IS_ERR(table))
2078 return PTR_ERR(table);
55dd6f93
PNA		 2079 if (table->flags & NFT_TABLE_INACTIVE)
2080 return -ENOENT;
96518518 2081
cf9dc09d
PNA		 2082 if (nla[NFTA_RULE_CHAIN]) {
2083 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2084 if (IS_ERR(chain))
2085 return PTR_ERR(chain);
2086 }
96518518 2087
0628b123
PNA		 2088 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2089
cf9dc09d
PNA		 2090 if (chain) {
2091 if (nla[NFTA_RULE_HANDLE]) {
2092 rule = nf_tables_rule_lookup(chain,
2093 nla[NFTA_RULE_HANDLE]);
2094 if (IS_ERR(rule))
2095 return PTR_ERR(rule);
96518518 2096
5e266fe7 2097 err = nft_delrule(&ctx, rule);
cf9dc09d 2098 } else {
ce24b721 2099 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2100 }
2101 } else {
2102 list_for_each_entry(chain, &table->chains, list) {
2103 ctx.chain = chain;
ce24b721 2104 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2105 if (err < 0)
2106 break;
2107 }
2108 }
2109
2110 return err;
2111}
2112
20a69341
PM		 2113/*
2114 * Sets
2115 */
2116
2117static LIST_HEAD(nf_tables_set_ops);
2118
2119int nft_register_set(struct nft_set_ops *ops)
2120{
2121 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2122 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2123 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2124 return 0;
2125}
2126EXPORT_SYMBOL_GPL(nft_register_set);
2127
2128void nft_unregister_set(struct nft_set_ops *ops)
2129{
2130 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2131 list_del_rcu(&ops->list);
20a69341
PM		 2132 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2133}
2134EXPORT_SYMBOL_GPL(nft_unregister_set);
2135
c50b960c
PM		 2136/*
2137 * Select a set implementation based on the data characteristics and the
2138 * given policy. The total memory use might not be known if no size is
2139 * given, in that case the amount of memory per element is used.
2140 */
2141static const struct nft_set_ops *
2142nft_select_set_ops(const struct nlattr * const nla[],
2143 const struct nft_set_desc *desc,
2144 enum nft_set_policies policy)
20a69341 2145{
c50b960c
PM		 2146 const struct nft_set_ops *ops, *bops;
2147 struct nft_set_estimate est, best;
20a69341
PM		 2148 u32 features;
2149
2150#ifdef CONFIG_MODULES
2151 if (list_empty(&nf_tables_set_ops)) {
2152 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2153 request_module("nft-set");
2154 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2155 if (!list_empty(&nf_tables_set_ops))
2156 return ERR_PTR(-EAGAIN);
2157 }
2158#endif
2159 features = 0;
2160 if (nla[NFTA_SET_FLAGS] != NULL) {
2161 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2162 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2163 }
2164
c50b960c
PM		 2165 bops = NULL;
2166 best.size = ~0;
2167 best.class = ~0;
2168
20a69341
PM		 2169 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2170 if ((ops->features & features) != features)
2171 continue;
c50b960c
PM		 2172 if (!ops->estimate(desc, features, &est))
2173 continue;
2174
2175 switch (policy) {
2176 case NFT_SET_POL_PERFORMANCE:
2177 if (est.class < best.class)
2178 break;
2179 if (est.class == best.class && est.size < best.size)
2180 break;
2181 continue;
2182 case NFT_SET_POL_MEMORY:
2183 if (est.size < best.size)
2184 break;
2185 if (est.size == best.size && est.class < best.class)
2186 break;
2187 continue;
2188 default:
2189 break;
2190 }
2191
20a69341
PM		 2192 if (!try_module_get(ops->owner))
2193 continue;
c50b960c
PM		 2194 if (bops != NULL)
2195 module_put(bops->owner);
2196
2197 bops = ops;
2198 best = est;
20a69341
PM		 2199 }
2200
c50b960c
PM		 2201 if (bops != NULL)
2202 return bops;
2203
20a69341
PM		 2204 return ERR_PTR(-EOPNOTSUPP);
2205}
2206
2207static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2208 [NFTA_SET_TABLE] = { .type = NLA_STRING },
a9bdd836
PNA		 2209 [NFTA_SET_NAME] = { .type = NLA_STRING,
2210 .len = IFNAMSIZ - 1 },
20a69341
PM		 2211 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2212 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2213 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2214 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2215 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2216 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2217 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2218 [NFTA_SET_ID] = { .type = NLA_U32 },
c50b960c
PM		 2219};
2220
2221static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2222 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2223};
2224
2225static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2226 const struct sk_buff *skb,
2227 const struct nlmsghdr *nlh,
2228 const struct nlattr * const nla[])
2229{
99633ab2 2230 struct net *net = sock_net(skb->sk);
20a69341 2231 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2232 struct nft_af_info *afi = NULL;
2233 struct nft_table *table = NULL;
20a69341 2234
c9c8e485
PNA		 2235 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2236 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2237 if (IS_ERR(afi))
2238 return PTR_ERR(afi);
2239 }
20a69341
PM		 2240
2241 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2242 if (afi == NULL)
2243 return -EAFNOSUPPORT;
2244
9370761c 2245 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2246 if (IS_ERR(table))
2247 return PTR_ERR(table);
55dd6f93
PNA		 2248 if (table->flags & NFT_TABLE_INACTIVE)
2249 return -ENOENT;
20a69341
PM		 2250 }
2251
0ca743a5 2252 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2253 return 0;
2254}
2255
2256struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2257 const struct nlattr *nla)
2258{
2259 struct nft_set *set;
2260
2261 if (nla == NULL)
2262 return ERR_PTR(-EINVAL);
2263
2264 list_for_each_entry(set, &table->sets, list) {
2265 if (!nla_strcmp(nla, set->name))
2266 return set;
2267 }
2268 return ERR_PTR(-ENOENT);
2269}
2270
958bee14
PNA		 2271struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2272 const struct nlattr *nla)
2273{
2274 struct nft_trans *trans;
2275 u32 id = ntohl(nla_get_be32(nla));
2276
2277 list_for_each_entry(trans, &net->nft.commit_list, list) {
2278 if (trans->msg_type == NFT_MSG_NEWSET &&
2279 id == nft_trans_set_id(trans))
2280 return nft_trans_set(trans);
2281 }
2282 return ERR_PTR(-ENOENT);
2283}
2284
20a69341
PM		 2285static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2286 const char *name)
2287{
2288 const struct nft_set *i;
2289 const char *p;
2290 unsigned long *inuse;
60eb1894 2291 unsigned int n = 0, min = 0;
20a69341
PM		 2292
2293 p = strnchr(name, IFNAMSIZ, '%');
2294 if (p != NULL) {
2295 if (p[1] != 'd' || strchr(p + 2, '%'))
2296 return -EINVAL;
2297
2298 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2299 if (inuse == NULL)
2300 return -ENOMEM;
60eb1894 2301cont:
20a69341 2302 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2303 int tmp;
2304
2305 if (!sscanf(i->name, name, &tmp))
20a69341 2306 continue;
60eb1894 2307 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2308 continue;
14662917 2309
60eb1894 2310 set_bit(tmp - min, inuse);
20a69341
PM		 2311 }
2312
53b70287 2313 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2314 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2315 min += BITS_PER_BYTE * PAGE_SIZE;
2316 memset(inuse, 0, PAGE_SIZE);
2317 goto cont;
2318 }
20a69341
PM		 2319 free_page((unsigned long)inuse);
2320 }
2321
60eb1894 2322 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341
PM		 2323 list_for_each_entry(i, &ctx->table->sets, list) {
2324 if (!strcmp(set->name, i->name))
2325 return -ENFILE;
2326 }
2327 return 0;
2328}
2329
2330static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2331 const struct nft_set *set, u16 event, u16 flags)
2332{
2333 struct nfgenmsg *nfmsg;
2334 struct nlmsghdr *nlh;
c50b960c 2335 struct nlattr *desc;
128ad332
PNA		 2336 u32 portid = ctx->portid;
2337 u32 seq = ctx->seq;
20a69341
PM		 2338
2339 event |= NFNL_SUBSYS_NFTABLES << 8;
2340 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2341 flags);
2342 if (nlh == NULL)
2343 goto nla_put_failure;
2344
2345 nfmsg = nlmsg_data(nlh);
2346 nfmsg->nfgen_family = ctx->afi->family;
2347 nfmsg->version = NFNETLINK_V0;
84d7fce6 2348 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2349
2350 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2351 goto nla_put_failure;
2352 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2353 goto nla_put_failure;
2354 if (set->flags != 0)
2355 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2356 goto nla_put_failure;
2357
2358 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2359 goto nla_put_failure;
2360 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2361 goto nla_put_failure;
2362 if (set->flags & NFT_SET_MAP) {
2363 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2364 goto nla_put_failure;
2365 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2366 goto nla_put_failure;
2367 }
2368
9363dc4b
AB		 2369 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2370 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2371 goto nla_put_failure;
2372 }
2373
c50b960c
PM		 2374 desc = nla_nest_start(skb, NFTA_SET_DESC);
2375 if (desc == NULL)
2376 goto nla_put_failure;
2377 if (set->size &&
2378 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2379 goto nla_put_failure;
2380 nla_nest_end(skb, desc);
2381
053c095a
JB		 2382 nlmsg_end(skb, nlh);
2383 return 0;
20a69341
PM		 2384
2385nla_put_failure:
2386 nlmsg_trim(skb, nlh);
2387 return -1;
2388}
2389
2390static int nf_tables_set_notify(const struct nft_ctx *ctx,
2391 const struct nft_set *set,
31f8441c 2392 int event, gfp_t gfp_flags)
20a69341
PM		 2393{
2394 struct sk_buff *skb;
128ad332 2395 u32 portid = ctx->portid;
20a69341
PM		 2396 int err;
2397
128ad332
PNA		 2398 if (!ctx->report &&
2399 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2400 return 0;
2401
2402 err = -ENOBUFS;
31f8441c 2403 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2404 if (skb == NULL)
2405 goto err;
2406
2407 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2408 if (err < 0) {
2409 kfree_skb(skb);
2410 goto err;
2411 }
2412
128ad332 2413 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2414 ctx->report, gfp_flags);
20a69341
PM		 2415err:
2416 if (err < 0)
99633ab2 2417 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2418 return err;
2419}
2420
5b96af77 2421static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2422{
2423 const struct nft_set *set;
2424 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2425 struct nft_af_info *afi;
c9c8e485
PNA		 2426 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2427 struct net *net = sock_net(skb->sk);
2428 int cur_family = cb->args[3];
5b96af77 2429 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2430
2431 if (cb->args[1])
2432 return skb->len;
2433
e688a7f8 2434 rcu_read_lock();
38e029f1
PNA		 2435 cb->seq = net->nft.base_seq;
2436
e688a7f8 2437 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2438 if (ctx->afi && ctx->afi != afi)
2439 continue;
2440
c9c8e485
PNA		 2441 if (cur_family) {
2442 if (afi->family != cur_family)
2443 continue;
2444
2445 cur_family = 0;
2446 }
e688a7f8 2447 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2448 if (ctx->table && ctx->table != table)
2449 continue;
2450
c9c8e485
PNA		 2451 if (cur_table) {
2452 if (cur_table != table)
2453 continue;
2454
2455 cur_table = NULL;
2456 }
c9c8e485 2457 idx = 0;
5b96af77 2458 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2459 if (idx < s_idx)
2460 goto cont;
5b96af77
PNA		 2461
2462 ctx_set = *ctx;
2463 ctx_set.table = table;
2464 ctx_set.afi = afi;
2465 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2466 NFT_MSG_NEWSET,
2467 NLM_F_MULTI) < 0) {
2468 cb->args[0] = idx;
2469 cb->args[2] = (unsigned long) table;
2470 cb->args[3] = afi->family;
2471 goto done;
2472 }
38e029f1 2473 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2474cont:
2475 idx++;
2476 }
2477 if (s_idx)
2478 s_idx = 0;
2479 }
2480 }
2481 cb->args[1] = 1;
2482done:
e688a7f8 2483 rcu_read_unlock();
c9c8e485
PNA		 2484 return skb->len;
2485}
2486
5b96af77 2487static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2488{
5b96af77
PNA		 2489 kfree(cb->data);
2490 return 0;
20a69341
PM		 2491}
2492
2493static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2494 const struct nlmsghdr *nlh,
2495 const struct nlattr * const nla[])
2496{
2497 const struct nft_set *set;
2498 struct nft_ctx ctx;
2499 struct sk_buff *skb2;
c9c8e485 2500 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2501 int err;
2502
01cfa0a4 2503 /* Verify existence before starting dump */
20a69341
PM		 2504 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2505 if (err < 0)
2506 return err;
2507
2508 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2509 struct netlink_dump_control c = {
2510 .dump = nf_tables_dump_sets,
5b96af77 2511 .done = nf_tables_dump_sets_done,
20a69341 2512 };
5b96af77
PNA		 2513 struct nft_ctx *ctx_dump;
2514
2515 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2516 if (ctx_dump == NULL)
2517 return -ENOMEM;
2518
2519 *ctx_dump = ctx;
2520 c.data = ctx_dump;
2521
20a69341
PM		 2522 return netlink_dump_start(nlsk, skb, nlh, &c);
2523 }
2524
c9c8e485
PNA		 2525 /* Only accept unspec with dump */
2526 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2527 return -EAFNOSUPPORT;
2528
20a69341
PM		 2529 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2530 if (IS_ERR(set))
2531 return PTR_ERR(set);
958bee14
PNA		 2532 if (set->flags & NFT_SET_INACTIVE)
2533 return -ENOENT;
20a69341
PM		 2534
2535 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2536 if (skb2 == NULL)
2537 return -ENOMEM;
2538
2539 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2540 if (err < 0)
2541 goto err;
2542
2543 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2544
2545err:
2546 kfree_skb(skb2);
2547 return err;
2548}
2549
c50b960c
PM		 2550static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2551 struct nft_set_desc *desc,
2552 const struct nlattr *nla)
2553{
2554 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2555 int err;
2556
2557 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2558 if (err < 0)
2559 return err;
2560
2561 if (da[NFTA_SET_DESC_SIZE] != NULL)
2562 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2563
2564 return 0;
2565}
2566
20a69341
PM		 2567static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2568 const struct nlmsghdr *nlh,
2569 const struct nlattr * const nla[])
2570{
2571 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2572 const struct nft_set_ops *ops;
7c95f6d8 2573 struct nft_af_info *afi;
99633ab2 2574 struct net *net = sock_net(skb->sk);
20a69341
PM		 2575 struct nft_table *table;
2576 struct nft_set *set;
2577 struct nft_ctx ctx;
2578 char name[IFNAMSIZ];
2579 unsigned int size;
2580 bool create;
c50b960c
PM		 2581 u32 ktype, dtype, flags, policy;
2582 struct nft_set_desc desc;
20a69341
PM		 2583 int err;
2584
2585 if (nla[NFTA_SET_TABLE] == NULL ||
2586 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2587 nla[NFTA_SET_KEY_LEN] == NULL ||
2588 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2589 return -EINVAL;
2590
c50b960c
PM		 2591 memset(&desc, 0, sizeof(desc));
2592
20a69341
PM		 2593 ktype = NFT_DATA_VALUE;
2594 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2595 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2596 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2597 return -EINVAL;
2598 }
2599
c50b960c
PM		 2600 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2601 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
20a69341
PM		 2602 return -EINVAL;
2603
2604 flags = 0;
2605 if (nla[NFTA_SET_FLAGS] != NULL) {
2606 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2607 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2608 NFT_SET_INTERVAL | NFT_SET_MAP))
2609 return -EINVAL;
2610 }
2611
2612 dtype = 0;
20a69341
PM		 2613 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2614 if (!(flags & NFT_SET_MAP))
2615 return -EINVAL;
2616
2617 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2618 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2619 dtype != NFT_DATA_VERDICT)
2620 return -EINVAL;
2621
2622 if (dtype != NFT_DATA_VERDICT) {
2623 if (nla[NFTA_SET_DATA_LEN] == NULL)
2624 return -EINVAL;
c50b960c
PM		 2625 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2626 if (desc.dlen == 0 ||
2627 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
20a69341
PM		 2628 return -EINVAL;
2629 } else
c50b960c 2630 desc.dlen = sizeof(struct nft_data);
20a69341
PM		 2631 } else if (flags & NFT_SET_MAP)
2632 return -EINVAL;
2633
c50b960c
PM		 2634 policy = NFT_SET_POL_PERFORMANCE;
2635 if (nla[NFTA_SET_POLICY] != NULL)
2636 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2637
2638 if (nla[NFTA_SET_DESC] != NULL) {
2639 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2640 if (err < 0)
2641 return err;
2642 }
2643
20a69341
PM		 2644 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2645
99633ab2 2646 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2647 if (IS_ERR(afi))
2648 return PTR_ERR(afi);
2649
9370761c 2650 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2651 if (IS_ERR(table))
2652 return PTR_ERR(table);
2653
0ca743a5 2654 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2655
2656 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2657 if (IS_ERR(set)) {
2658 if (PTR_ERR(set) != -ENOENT)
2659 return PTR_ERR(set);
2660 set = NULL;
2661 }
2662
2663 if (set != NULL) {
2664 if (nlh->nlmsg_flags & NLM_F_EXCL)
2665 return -EEXIST;
2666 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2667 return -EOPNOTSUPP;
2668 return 0;
2669 }
2670
2671 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2672 return -ENOENT;
2673
c50b960c 2674 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 2675 if (IS_ERR(ops))
2676 return PTR_ERR(ops);
2677
2678 size = 0;
2679 if (ops->privsize != NULL)
2680 size = ops->privsize(nla);
2681
2682 err = -ENOMEM;
2683 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2684 if (set == NULL)
2685 goto err1;
2686
2687 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2688 err = nf_tables_set_alloc_name(&ctx, set, name);
2689 if (err < 0)
2690 goto err2;
2691
2692 INIT_LIST_HEAD(&set->bindings);
2693 set->ops = ops;
2694 set->ktype = ktype;
c50b960c 2695 set->klen = desc.klen;
20a69341 2696 set->dtype = dtype;
c50b960c 2697 set->dlen = desc.dlen;
20a69341 2698 set->flags = flags;
c50b960c 2699 set->size = desc.size;
9363dc4b 2700 set->policy = policy;
20a69341 2701
c50b960c 2702 err = ops->init(set, &desc, nla);
20a69341
PM		 2703 if (err < 0)
2704 goto err2;
2705
958bee14 2706 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341
PM		 2707 if (err < 0)
2708 goto err2;
2709
e688a7f8 2710 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 2711 table->use++;
20a69341
PM		 2712 return 0;
2713
2714err2:
2715 kfree(set);
2716err1:
2717 module_put(ops->owner);
2718 return err;
2719}
2720
958bee14 2721static void nft_set_destroy(struct nft_set *set)
20a69341 2722{
20a69341
PM		 2723 set->ops->destroy(set);
2724 module_put(set->ops->owner);
2725 kfree(set);
2726}
2727
958bee14
PNA		 2728static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2729{
e688a7f8 2730 list_del_rcu(&set->list);
31f8441c 2731 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 2732 nft_set_destroy(set);
2733}
2734
20a69341
PM		 2735static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2736 const struct nlmsghdr *nlh,
2737 const struct nlattr * const nla[])
2738{
c9c8e485 2739 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2740 struct nft_set *set;
2741 struct nft_ctx ctx;
2742 int err;
2743
ec2c9935
PM		 2744 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2745 return -EAFNOSUPPORT;
20a69341
PM		 2746 if (nla[NFTA_SET_TABLE] == NULL)
2747 return -EINVAL;
2748
2749 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2750 if (err < 0)
2751 return err;
2752
2753 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2754 if (IS_ERR(set))
2755 return PTR_ERR(set);
958bee14
PNA		 2756 if (set->flags & NFT_SET_INACTIVE)
2757 return -ENOENT;
20a69341
PM		 2758 if (!list_empty(&set->bindings))
2759 return -EBUSY;
2760
ee01d542 2761 return nft_delset(&ctx, set);
20a69341
PM		 2762}
2763
2764static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2765 const struct nft_set *set,
2766 const struct nft_set_iter *iter,
2767 const struct nft_set_elem *elem)
2768{
fe2811eb 2769 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 2770 enum nft_registers dreg;
2771
2772 dreg = nft_type_to_reg(set->dtype);
fe2811eb 2773 return nft_validate_data_load(ctx, dreg, nft_set_ext_data(ext),
2ee0d3c8
PNA		 2774 set->dtype == NFT_DATA_VERDICT ?
2775 NFT_DATA_VERDICT : NFT_DATA_VALUE);
20a69341
PM		 2776}
2777
2778int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2779 struct nft_set_binding *binding)
2780{
2781 struct nft_set_binding *i;
2782 struct nft_set_iter iter;
2783
2784 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2785 return -EBUSY;
2786
2787 if (set->flags & NFT_SET_MAP) {
2788 /* If the set is already bound to the same chain all
2789 * jumps are already validated for that chain.
2790 */
2791 list_for_each_entry(i, &set->bindings, list) {
2792 if (i->chain == binding->chain)
2793 goto bind;
2794 }
2795
2796 iter.skip = 0;
2797 iter.count = 0;
2798 iter.err = 0;
2799 iter.fn = nf_tables_bind_check_setelem;
2800
2801 set->ops->walk(ctx, set, &iter);
2802 if (iter.err < 0) {
2803 /* Destroy anonymous sets if binding fails */
2804 if (set->flags & NFT_SET_ANONYMOUS)
2805 nf_tables_set_destroy(ctx, set);
2806
2807 return iter.err;
2808 }
2809 }
2810bind:
2811 binding->chain = ctx->chain;
e688a7f8 2812 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 2813 return 0;
2814}
2815
2816void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2817 struct nft_set_binding *binding)
2818{
e688a7f8 2819 list_del_rcu(&binding->list);
20a69341 2820
958bee14
PNA		 2821 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2822 !(set->flags & NFT_SET_INACTIVE))
20a69341
PM		 2823 nf_tables_set_destroy(ctx, set);
2824}
2825
3ac4c07a
PM		 2826const struct nft_set_ext_type nft_set_ext_types[] = {
2827 [NFT_SET_EXT_KEY] = {
2828 .len = sizeof(struct nft_data),
2829 .align = __alignof__(struct nft_data),
2830 },
2831 [NFT_SET_EXT_DATA] = {
2832 .len = sizeof(struct nft_data),
2833 .align = __alignof__(struct nft_data),
2834 },
2835 [NFT_SET_EXT_FLAGS] = {
2836 .len = sizeof(u8),
2837 .align = __alignof__(u8),
2838 },
2839};
2840EXPORT_SYMBOL_GPL(nft_set_ext_types);
2841
20a69341
PM		 2842/*
2843 * Set elements
2844 */
2845
2846static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2847 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2848 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2849 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2850};
2851
2852static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2853 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2854 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2855 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 2856 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 2857};
2858
2859static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2860 const struct sk_buff *skb,
2861 const struct nlmsghdr *nlh,
55dd6f93
PNA		 2862 const struct nlattr * const nla[],
2863 bool trans)
20a69341
PM		 2864{
2865 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2866 struct nft_af_info *afi;
2867 struct nft_table *table;
99633ab2 2868 struct net *net = sock_net(skb->sk);
20a69341 2869
99633ab2 2870 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 2871 if (IS_ERR(afi))
2872 return PTR_ERR(afi);
2873
9370761c 2874 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341
PM		 2875 if (IS_ERR(table))
2876 return PTR_ERR(table);
55dd6f93
PNA		 2877 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2878 return -ENOENT;
20a69341 2879
0ca743a5 2880 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2881 return 0;
2882}
2883
2884static int nf_tables_fill_setelem(struct sk_buff *skb,
2885 const struct nft_set *set,
2886 const struct nft_set_elem *elem)
2887{
fe2811eb 2888 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 2889 unsigned char *b = skb_tail_pointer(skb);
2890 struct nlattr *nest;
2891
2892 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2893 if (nest == NULL)
2894 goto nla_put_failure;
2895
fe2811eb
PM		 2896 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
2897 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 2898 goto nla_put_failure;
2899
fe2811eb
PM		 2900 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
2901 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 2902 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2903 set->dlen) < 0)
2904 goto nla_put_failure;
2905
fe2811eb
PM		 2906 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
2907 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
2908 htonl(*nft_set_ext_flags(ext))))
2909 goto nla_put_failure;
20a69341
PM		 2910
2911 nla_nest_end(skb, nest);
2912 return 0;
2913
2914nla_put_failure:
2915 nlmsg_trim(skb, b);
2916 return -EMSGSIZE;
2917}
2918
2919struct nft_set_dump_args {
2920 const struct netlink_callback *cb;
2921 struct nft_set_iter iter;
2922 struct sk_buff *skb;
2923};
2924
2925static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2926 const struct nft_set *set,
2927 const struct nft_set_iter *iter,
2928 const struct nft_set_elem *elem)
2929{
2930 struct nft_set_dump_args *args;
2931
2932 args = container_of(iter, struct nft_set_dump_args, iter);
2933 return nf_tables_fill_setelem(args->skb, set, elem);
2934}
2935
2936static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2937{
2938 const struct nft_set *set;
2939 struct nft_set_dump_args args;
2940 struct nft_ctx ctx;
2941 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2942 struct nfgenmsg *nfmsg;
2943 struct nlmsghdr *nlh;
2944 struct nlattr *nest;
2945 u32 portid, seq;
2946 int event, err;
2947
720e0dfa
MN		 2948 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2949 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 2950 if (err < 0)
2951 return err;
2952
55dd6f93
PNA		 2953 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2954 false);
20a69341
PM		 2955 if (err < 0)
2956 return err;
2957
2958 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2959 if (IS_ERR(set))
2960 return PTR_ERR(set);
958bee14
PNA		 2961 if (set->flags & NFT_SET_INACTIVE)
2962 return -ENOENT;
20a69341
PM		 2963
2964 event = NFT_MSG_NEWSETELEM;
2965 event |= NFNL_SUBSYS_NFTABLES << 8;
2966 portid = NETLINK_CB(cb->skb).portid;
2967 seq = cb->nlh->nlmsg_seq;
2968
2969 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2970 NLM_F_MULTI);
2971 if (nlh == NULL)
2972 goto nla_put_failure;
2973
2974 nfmsg = nlmsg_data(nlh);
6403d962 2975 nfmsg->nfgen_family = ctx.afi->family;
20a69341 2976 nfmsg->version = NFNETLINK_V0;
84d7fce6 2977 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 2978
2979 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2980 goto nla_put_failure;
2981 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2982 goto nla_put_failure;
2983
2984 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2985 if (nest == NULL)
2986 goto nla_put_failure;
2987
2988 args.cb = cb;
2989 args.skb = skb;
2990 args.iter.skip = cb->args[0];
2991 args.iter.count = 0;
2992 args.iter.err = 0;
2993 args.iter.fn = nf_tables_dump_setelem;
2994 set->ops->walk(&ctx, set, &args.iter);
2995
2996 nla_nest_end(skb, nest);
2997 nlmsg_end(skb, nlh);
2998
2999 if (args.iter.err && args.iter.err != -EMSGSIZE)
3000 return args.iter.err;
3001 if (args.iter.count == cb->args[0])
3002 return 0;
3003
3004 cb->args[0] = args.iter.count;
3005 return skb->len;
3006
3007nla_put_failure:
3008 return -ENOSPC;
3009}
3010
3011static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
3012 const struct nlmsghdr *nlh,
3013 const struct nlattr * const nla[])
3014{
3015 const struct nft_set *set;
3016 struct nft_ctx ctx;
3017 int err;
3018
55dd6f93 3019 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
20a69341
PM		 3020 if (err < 0)
3021 return err;
3022
3023 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3024 if (IS_ERR(set))
3025 return PTR_ERR(set);
958bee14
PNA		 3026 if (set->flags & NFT_SET_INACTIVE)
3027 return -ENOENT;
20a69341
PM		 3028
3029 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3030 struct netlink_dump_control c = {
3031 .dump = nf_tables_dump_set,
3032 };
3033 return netlink_dump_start(nlsk, skb, nlh, &c);
3034 }
3035 return -EOPNOTSUPP;
3036}
3037
d60ce62f
AB		 3038static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3039 const struct nft_ctx *ctx, u32 seq,
3040 u32 portid, int event, u16 flags,
3041 const struct nft_set *set,
3042 const struct nft_set_elem *elem)
3043{
3044 struct nfgenmsg *nfmsg;
3045 struct nlmsghdr *nlh;
3046 struct nlattr *nest;
3047 int err;
3048
3049 event |= NFNL_SUBSYS_NFTABLES << 8;
3050 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3051 flags);
3052 if (nlh == NULL)
3053 goto nla_put_failure;
3054
3055 nfmsg = nlmsg_data(nlh);
3056 nfmsg->nfgen_family = ctx->afi->family;
3057 nfmsg->version = NFNETLINK_V0;
84d7fce6 3058 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3059
3060 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3061 goto nla_put_failure;
3062 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3063 goto nla_put_failure;
3064
3065 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3066 if (nest == NULL)
3067 goto nla_put_failure;
3068
3069 err = nf_tables_fill_setelem(skb, set, elem);
3070 if (err < 0)
3071 goto nla_put_failure;
3072
3073 nla_nest_end(skb, nest);
3074
053c095a
JB		 3075 nlmsg_end(skb, nlh);
3076 return 0;
d60ce62f
AB		 3077
3078nla_put_failure:
3079 nlmsg_trim(skb, nlh);
3080 return -1;
3081}
3082
3083static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3084 const struct nft_set *set,
3085 const struct nft_set_elem *elem,
3086 int event, u16 flags)
3087{
128ad332
PNA		 3088 struct net *net = ctx->net;
3089 u32 portid = ctx->portid;
d60ce62f
AB		 3090 struct sk_buff *skb;
3091 int err;
3092
128ad332 3093 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3094 return 0;
3095
3096 err = -ENOBUFS;
3097 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3098 if (skb == NULL)
3099 goto err;
3100
3101 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3102 set, elem);
3103 if (err < 0) {
3104 kfree_skb(skb);
3105 goto err;
3106 }
3107
128ad332 3108 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3109 GFP_KERNEL);
3110err:
3111 if (err < 0)
3112 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3113 return err;
3114}
3115
60319eb1
PNA		 3116static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3117 int msg_type,
3118 struct nft_set *set)
3119{
3120 struct nft_trans *trans;
3121
3122 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3123 if (trans == NULL)
3124 return NULL;
3125
3126 nft_trans_elem_set(trans) = set;
3127 return trans;
3128}
3129
fe2811eb
PM		 3130static void *nft_set_elem_init(const struct nft_set *set,
3131 const struct nft_set_ext_tmpl *tmpl,
3132 const struct nft_data *key,
3133 const struct nft_data *data,
3134 gfp_t gfp)
3135{
3136 struct nft_set_ext *ext;
3137 void *elem;
3138
3139 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3140 if (elem == NULL)
3141 return NULL;
3142
3143 ext = nft_set_elem_ext(set, elem);
3144 nft_set_ext_init(ext, tmpl);
3145
3146 memcpy(nft_set_ext_key(ext), key, set->klen);
3147 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3148 memcpy(nft_set_ext_data(ext), data, set->dlen);
3149
3150 return elem;
3151}
3152
61edafbb
PM		 3153void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3154{
3155 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3156
3157 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3158 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3159 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
3160
3161 kfree(elem);
3162}
3163EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3164
60319eb1 3165static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3166 const struct nlattr *attr)
3167{
3168 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3169 struct nft_data_desc d1, d2;
fe2811eb
PM		 3170 struct nft_set_ext_tmpl tmpl;
3171 struct nft_set_ext *ext;
20a69341
PM		 3172 struct nft_set_elem elem;
3173 struct nft_set_binding *binding;
fe2811eb 3174 struct nft_data data;
20a69341 3175 enum nft_registers dreg;
60319eb1 3176 struct nft_trans *trans;
fe2811eb 3177 u32 flags;
20a69341
PM		 3178 int err;
3179
c50b960c
PM		 3180 if (set->size && set->nelems == set->size)
3181 return -ENFILE;
3182
20a69341
PM		 3183 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3184 nft_set_elem_policy);
3185 if (err < 0)
3186 return err;
3187
3188 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3189 return -EINVAL;
3190
fe2811eb
PM		 3191 nft_set_ext_prepare(&tmpl);
3192
3193 flags = 0;
20a69341 3194 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
fe2811eb
PM		 3195 flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3196 if (flags & ~NFT_SET_ELEM_INTERVAL_END)
20a69341 3197 return -EINVAL;
55df35d2 3198 if (!(set->flags & NFT_SET_INTERVAL) &&
fe2811eb 3199 flags & NFT_SET_ELEM_INTERVAL_END)
55df35d2 3200 return -EINVAL;
fe2811eb
PM		 3201 if (flags != 0)
3202 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3203 }
3204
3205 if (set->flags & NFT_SET_MAP) {
3206 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3207 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3208 return -EINVAL;
bd7fc645 3209 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3210 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3211 return -EINVAL;
20a69341
PM		 3212 } else {
3213 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3214 return -EINVAL;
3215 }
3216
3217 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3218 if (err < 0)
3219 goto err1;
3220 err = -EINVAL;
3221 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3222 goto err2;
3223
3224 err = -EEXIST;
3225 if (set->ops->get(set, &elem) == 0)
3226 goto err2;
3227
fe2811eb
PM		 3228 nft_set_ext_add(&tmpl, NFT_SET_EXT_KEY);
3229
20a69341 3230 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
fe2811eb 3231 err = nft_data_init(ctx, &data, &d2, nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3232 if (err < 0)
3233 goto err2;
3234
3235 err = -EINVAL;
3236 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3237 goto err3;
3238
3239 dreg = nft_type_to_reg(set->dtype);
3240 list_for_each_entry(binding, &set->bindings, list) {
3241 struct nft_ctx bind_ctx = {
3242 .afi = ctx->afi,
3243 .table = ctx->table,
7c95f6d8 3244 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3245 };
3246
3247 err = nft_validate_data_load(&bind_ctx, dreg,
fe2811eb 3248 &data, d2.type);
20a69341
PM		 3249 if (err < 0)
3250 goto err3;
3251 }
fe2811eb
PM		 3252
3253 nft_set_ext_add(&tmpl, NFT_SET_EXT_DATA);
20a69341
PM		 3254 }
3255
fe2811eb
PM		 3256 err = -ENOMEM;
3257 elem.priv = nft_set_elem_init(set, &tmpl, &elem.key, &data, GFP_KERNEL);
3258 if (elem.priv == NULL)
3259 goto err3;
3260
3261 ext = nft_set_elem_ext(set, elem.priv);
3262 if (flags)
3263 *nft_set_ext_flags(ext) = flags;
3264
60319eb1
PNA		 3265 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3266 if (trans == NULL)
fe2811eb 3267 goto err4;
60319eb1 3268
20a69341
PM		 3269 err = set->ops->insert(set, &elem);
3270 if (err < 0)
fe2811eb 3271 goto err5;
20a69341 3272
60319eb1 3273 nft_trans_elem(trans) = elem;
46bbafce 3274 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3275 return 0;
3276
fe2811eb 3277err5:
60319eb1 3278 kfree(trans);
fe2811eb
PM		 3279err4:
3280 kfree(elem.priv);
20a69341
PM		 3281err3:
3282 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3283 nft_data_uninit(&data, d2.type);
20a69341
PM		 3284err2:
3285 nft_data_uninit(&elem.key, d1.type);
3286err1:
3287 return err;
3288}
3289
3290static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3291 const struct nlmsghdr *nlh,
3292 const struct nlattr * const nla[])
3293{
958bee14 3294 struct net *net = sock_net(skb->sk);
20a69341
PM		 3295 const struct nlattr *attr;
3296 struct nft_set *set;
3297 struct nft_ctx ctx;
60319eb1 3298 int rem, err = 0;
20a69341 3299
7d5570ca
PNA		 3300 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3301 return -EINVAL;
3302
55dd6f93 3303 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
20a69341
PM		 3304 if (err < 0)
3305 return err;
3306
3307 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
958bee14
PNA		 3308 if (IS_ERR(set)) {
3309 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3310 set = nf_tables_set_lookup_byid(net,
3311 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3312 }
3313 if (IS_ERR(set))
3314 return PTR_ERR(set);
3315 }
3316
20a69341
PM		 3317 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3318 return -EBUSY;
3319
3320 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3321 err = nft_add_set_elem(&ctx, set, attr);
3322 if (err < 0)
60319eb1 3323 break;
4fefee57
PNA		 3324
3325 set->nelems++;
20a69341 3326 }
60319eb1 3327 return err;
20a69341
PM		 3328}
3329
60319eb1 3330static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3331 const struct nlattr *attr)
3332{
3333 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3334 struct nft_data_desc desc;
3335 struct nft_set_elem elem;
60319eb1 3336 struct nft_trans *trans;
20a69341
PM		 3337 int err;
3338
3339 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3340 nft_set_elem_policy);
3341 if (err < 0)
3342 goto err1;
3343
3344 err = -EINVAL;
3345 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3346 goto err1;
3347
3348 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3349 if (err < 0)
3350 goto err1;
3351
3352 err = -EINVAL;
3353 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3354 goto err2;
3355
3356 err = set->ops->get(set, &elem);
3357 if (err < 0)
3358 goto err2;
3359
60319eb1 3360 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3361 if (trans == NULL) {
3362 err = -ENOMEM;
60319eb1 3363 goto err2;
609ccf08 3364 }
20a69341 3365
60319eb1 3366 nft_trans_elem(trans) = elem;
46bbafce 3367 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3368 return 0;
20a69341
PM		 3369err2:
3370 nft_data_uninit(&elem.key, desc.type);
3371err1:
3372 return err;
3373}
3374
3375static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3376 const struct nlmsghdr *nlh,
3377 const struct nlattr * const nla[])
3378{
3379 const struct nlattr *attr;
3380 struct nft_set *set;
3381 struct nft_ctx ctx;
60319eb1 3382 int rem, err = 0;
20a69341 3383
7d5570ca
PNA		 3384 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3385 return -EINVAL;
3386
55dd6f93 3387 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
20a69341
PM		 3388 if (err < 0)
3389 return err;
3390
3391 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3392 if (IS_ERR(set))
3393 return PTR_ERR(set);
3394 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3395 return -EBUSY;
3396
3397 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3398 err = nft_del_setelem(&ctx, set, attr);
3399 if (err < 0)
60319eb1 3400 break;
4fefee57
PNA		 3401
3402 set->nelems--;
20a69341 3403 }
60319eb1 3404 return err;
20a69341
PM		 3405}
3406
84d7fce6
PNA		 3407static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3408 u32 portid, u32 seq)
3409{
3410 struct nlmsghdr *nlh;
3411 struct nfgenmsg *nfmsg;
3412 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3413
3414 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3415 if (nlh == NULL)
3416 goto nla_put_failure;
3417
3418 nfmsg = nlmsg_data(nlh);
3419 nfmsg->nfgen_family = AF_UNSPEC;
3420 nfmsg->version = NFNETLINK_V0;
3421 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3422
3423 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3424 goto nla_put_failure;
3425
053c095a
JB		 3426 nlmsg_end(skb, nlh);
3427 return 0;
84d7fce6
PNA		 3428
3429nla_put_failure:
3430 nlmsg_trim(skb, nlh);
3431 return -EMSGSIZE;
3432}
3433
3434static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3435{
3436 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3437 struct sk_buff *skb2;
3438 int err;
3439
3440 if (nlmsg_report(nlh) &&
3441 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3442 return 0;
3443
3444 err = -ENOBUFS;
3445 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3446 if (skb2 == NULL)
3447 goto err;
3448
3449 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3450 nlh->nlmsg_seq);
3451 if (err < 0) {
3452 kfree_skb(skb2);
3453 goto err;
3454 }
3455
3456 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3457 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3458err:
3459 if (err < 0) {
3460 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3461 err);
3462 }
3463 return err;
3464}
3465
3466static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3467 const struct nlmsghdr *nlh,
3468 const struct nlattr * const nla[])
3469{
3470 struct net *net = sock_net(skb->sk);
3471 struct sk_buff *skb2;
3472 int err;
3473
3474 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3475 if (skb2 == NULL)
3476 return -ENOMEM;
3477
3478 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3479 nlh->nlmsg_seq);
3480 if (err < 0)
3481 goto err;
3482
3483 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3484err:
3485 kfree_skb(skb2);
3486 return err;
3487}
3488
96518518
PM		 3489static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3490 [NFT_MSG_NEWTABLE] = {
55dd6f93 3491 .call_batch = nf_tables_newtable,
96518518
PM		 3492 .attr_count = NFTA_TABLE_MAX,
3493 .policy = nft_table_policy,
3494 },
3495 [NFT_MSG_GETTABLE] = {
3496 .call = nf_tables_gettable,
3497 .attr_count = NFTA_TABLE_MAX,
3498 .policy = nft_table_policy,
3499 },
3500 [NFT_MSG_DELTABLE] = {
55dd6f93 3501 .call_batch = nf_tables_deltable,
96518518
PM		 3502 .attr_count = NFTA_TABLE_MAX,
3503 .policy = nft_table_policy,
3504 },
3505 [NFT_MSG_NEWCHAIN] = {
91c7b38d 3506 .call_batch = nf_tables_newchain,
96518518
PM		 3507 .attr_count = NFTA_CHAIN_MAX,
3508 .policy = nft_chain_policy,
3509 },
3510 [NFT_MSG_GETCHAIN] = {
3511 .call = nf_tables_getchain,
3512 .attr_count = NFTA_CHAIN_MAX,
3513 .policy = nft_chain_policy,
3514 },
3515 [NFT_MSG_DELCHAIN] = {
91c7b38d 3516 .call_batch = nf_tables_delchain,
96518518
PM		 3517 .attr_count = NFTA_CHAIN_MAX,
3518 .policy = nft_chain_policy,
3519 },
3520 [NFT_MSG_NEWRULE] = {
0628b123 3521 .call_batch = nf_tables_newrule,
96518518
PM		 3522 .attr_count = NFTA_RULE_MAX,
3523 .policy = nft_rule_policy,
3524 },
3525 [NFT_MSG_GETRULE] = {
3526 .call = nf_tables_getrule,
3527 .attr_count = NFTA_RULE_MAX,
3528 .policy = nft_rule_policy,
3529 },
3530 [NFT_MSG_DELRULE] = {
0628b123 3531 .call_batch = nf_tables_delrule,
96518518
PM		 3532 .attr_count = NFTA_RULE_MAX,
3533 .policy = nft_rule_policy,
3534 },
20a69341 3535 [NFT_MSG_NEWSET] = {
958bee14 3536 .call_batch = nf_tables_newset,
20a69341
PM		 3537 .attr_count = NFTA_SET_MAX,
3538 .policy = nft_set_policy,
3539 },
3540 [NFT_MSG_GETSET] = {
3541 .call = nf_tables_getset,
3542 .attr_count = NFTA_SET_MAX,
3543 .policy = nft_set_policy,
3544 },
3545 [NFT_MSG_DELSET] = {
958bee14 3546 .call_batch = nf_tables_delset,
20a69341
PM		 3547 .attr_count = NFTA_SET_MAX,
3548 .policy = nft_set_policy,
3549 },
3550 [NFT_MSG_NEWSETELEM] = {
958bee14 3551 .call_batch = nf_tables_newsetelem,
20a69341
PM		 3552 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3553 .policy = nft_set_elem_list_policy,
3554 },
3555 [NFT_MSG_GETSETELEM] = {
3556 .call = nf_tables_getsetelem,
3557 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3558 .policy = nft_set_elem_list_policy,
3559 },
3560 [NFT_MSG_DELSETELEM] = {
958bee14 3561 .call_batch = nf_tables_delsetelem,
20a69341
PM		 3562 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3563 .policy = nft_set_elem_list_policy,
3564 },
84d7fce6
PNA		 3565 [NFT_MSG_GETGEN] = {
3566 .call = nf_tables_getgen,
3567 },
96518518
PM		 3568};
3569
91c7b38d
PNA		 3570static void nft_chain_commit_update(struct nft_trans *trans)
3571{
3572 struct nft_base_chain *basechain;
3573
3574 if (nft_trans_chain_name(trans)[0])
3575 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3576
3577 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3578 return;
3579
3580 basechain = nft_base_chain(trans->ctx.chain);
3581 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3582
3583 switch (nft_trans_chain_policy(trans)) {
3584 case NF_DROP:
3585 case NF_ACCEPT:
3586 basechain->policy = nft_trans_chain_policy(trans);
3587 break;
3588 }
3589}
3590
b326dd37 3591static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 3592{
c7c32e72
PNA		 3593 switch (trans->msg_type) {
3594 case NFT_MSG_DELTABLE:
3595 nf_tables_table_destroy(&trans->ctx);
3596 break;
3597 case NFT_MSG_DELCHAIN:
3598 nf_tables_chain_destroy(trans->ctx.chain);
3599 break;
3600 case NFT_MSG_DELRULE:
3601 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3602 break;
3603 case NFT_MSG_DELSET:
3604 nft_set_destroy(nft_trans_set(trans));
3605 break;
61edafbb
PM		 3606 case NFT_MSG_DELSETELEM:
3607 nft_set_elem_destroy(nft_trans_elem_set(trans),
3608 nft_trans_elem(trans).priv);
3609 break;
c7c32e72
PNA		 3610 }
3611 kfree(trans);
3612}
3613
37082f93
PNA		 3614static int nf_tables_commit(struct sk_buff *skb)
3615{
3616 struct net *net = sock_net(skb->sk);
3617 struct nft_trans *trans, *next;
a3716e70 3618 struct nft_trans_elem *te;
37082f93
PNA		 3619
3620 /* Bump generation counter, invalidate any dump in progress */
38e029f1 3621 while (++net->nft.base_seq == 0);
37082f93
PNA		 3622
3623 /* A new generation has just started */
ea4bd995 3624 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 3625
3626 /* Make sure all packets have left the previous generation before
3627 * purging old rules.
3628 */
3629 synchronize_rcu();
3630
3631 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3632 switch (trans->msg_type) {
55dd6f93
PNA		 3633 case NFT_MSG_NEWTABLE:
3634 if (nft_trans_table_update(trans)) {
3635 if (!nft_trans_table_enable(trans)) {
3636 nf_tables_table_disable(trans->ctx.afi,
3637 trans->ctx.table);
3638 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3639 }
3640 } else {
3641 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3642 }
35151d84 3643 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 3644 nft_trans_destroy(trans);
3645 break;
3646 case NFT_MSG_DELTABLE:
35151d84 3647 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 3648 break;
91c7b38d
PNA		 3649 case NFT_MSG_NEWCHAIN:
3650 if (nft_trans_chain_update(trans))
3651 nft_chain_commit_update(trans);
4fefee57 3652 else
91c7b38d 3653 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
4fefee57 3654
35151d84 3655 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 3656 nft_trans_destroy(trans);
3657 break;
3658 case NFT_MSG_DELCHAIN:
35151d84 3659 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c5598794
AB		 3660 nf_tables_unregister_hooks(trans->ctx.table,
3661 trans->ctx.chain,
3662 trans->ctx.afi->nops);
91c7b38d 3663 break;
b380e5c7
PNA		 3664 case NFT_MSG_NEWRULE:
3665 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 3666 nf_tables_rule_notify(&trans->ctx,
37082f93 3667 nft_trans_rule(trans),
35151d84 3668 NFT_MSG_NEWRULE);
37082f93 3669 nft_trans_destroy(trans);
b380e5c7
PNA		 3670 break;
3671 case NFT_MSG_DELRULE:
3672 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 3673 nf_tables_rule_notify(&trans->ctx,
3674 nft_trans_rule(trans),
3675 NFT_MSG_DELRULE);
b380e5c7 3676 break;
958bee14
PNA		 3677 case NFT_MSG_NEWSET:
3678 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
4fefee57
PNA		 3679 /* This avoids hitting -EBUSY when deleting the table
3680 * from the transaction.
3681 */
3682 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3683 !list_empty(&nft_trans_set(trans)->bindings))
3684 trans->ctx.table->use--;
3685
958bee14 3686 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 3687 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 3688 nft_trans_destroy(trans);
3689 break;
3690 case NFT_MSG_DELSET:
3691 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 3692 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 3693 break;
60319eb1 3694 case NFT_MSG_NEWSETELEM:
60319eb1
PNA		 3695 nf_tables_setelem_notify(&trans->ctx,
3696 nft_trans_elem_set(trans),
3697 &nft_trans_elem(trans),
3698 NFT_MSG_NEWSETELEM, 0);
3699 nft_trans_destroy(trans);
3700 break;
3701 case NFT_MSG_DELSETELEM:
a3716e70 3702 te = (struct nft_trans_elem *)trans->data;
fe2811eb 3703
a3716e70
PNA		 3704 nf_tables_setelem_notify(&trans->ctx, te->set,
3705 &te->elem,
60319eb1 3706 NFT_MSG_DELSETELEM, 0);
a3716e70 3707 te->set->ops->get(te->set, &te->elem);
02263db0 3708 te->set->ops->remove(te->set, &te->elem);
60319eb1 3709 break;
37082f93 3710 }
37082f93
PNA		 3711 }
3712
b326dd37
PNA		 3713 synchronize_rcu();
3714
37082f93 3715 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 3716 list_del(&trans->list);
b326dd37 3717 nf_tables_commit_release(trans);
37082f93 3718 }
84d7fce6
PNA		 3719
3720 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 3721
3722 return 0;
3723}
3724
b326dd37 3725static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 3726{
c7c32e72
PNA		 3727 switch (trans->msg_type) {
3728 case NFT_MSG_NEWTABLE:
3729 nf_tables_table_destroy(&trans->ctx);
3730 break;
3731 case NFT_MSG_NEWCHAIN:
3732 nf_tables_chain_destroy(trans->ctx.chain);
3733 break;
3734 case NFT_MSG_NEWRULE:
3735 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3736 break;
3737 case NFT_MSG_NEWSET:
3738 nft_set_destroy(nft_trans_set(trans));
3739 break;
61edafbb
PM		 3740 case NFT_MSG_NEWSETELEM:
3741 nft_set_elem_destroy(nft_trans_elem_set(trans),
3742 nft_trans_elem(trans).priv);
3743 break;
c7c32e72
PNA		 3744 }
3745 kfree(trans);
3746}
3747
37082f93
PNA		 3748static int nf_tables_abort(struct sk_buff *skb)
3749{
3750 struct net *net = sock_net(skb->sk);
3751 struct nft_trans *trans, *next;
02263db0 3752 struct nft_trans_elem *te;
37082f93
PNA		 3753
3754 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3755 switch (trans->msg_type) {
55dd6f93
PNA		 3756 case NFT_MSG_NEWTABLE:
3757 if (nft_trans_table_update(trans)) {
3758 if (nft_trans_table_enable(trans)) {
3759 nf_tables_table_disable(trans->ctx.afi,
3760 trans->ctx.table);
3761 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3762 }
3763 nft_trans_destroy(trans);
3764 } else {
e688a7f8 3765 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 3766 }
3767 break;
3768 case NFT_MSG_DELTABLE:
e688a7f8
PNA		 3769 list_add_tail_rcu(&trans->ctx.table->list,
3770 &trans->ctx.afi->tables);
55dd6f93
PNA		 3771 nft_trans_destroy(trans);
3772 break;
91c7b38d
PNA		 3773 case NFT_MSG_NEWCHAIN:
3774 if (nft_trans_chain_update(trans)) {
982f4051 3775 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 3776
3777 nft_trans_destroy(trans);
3778 } else {
4fefee57 3779 trans->ctx.table->use--;
e688a7f8 3780 list_del_rcu(&trans->ctx.chain->list);
c5598794
AB		 3781 nf_tables_unregister_hooks(trans->ctx.table,
3782 trans->ctx.chain,
3783 trans->ctx.afi->nops);
91c7b38d
PNA		 3784 }
3785 break;
3786 case NFT_MSG_DELCHAIN:
4fefee57 3787 trans->ctx.table->use++;
e688a7f8
PNA		 3788 list_add_tail_rcu(&trans->ctx.chain->list,
3789 &trans->ctx.table->chains);
91c7b38d
PNA		 3790 nft_trans_destroy(trans);
3791 break;
b380e5c7 3792 case NFT_MSG_NEWRULE:
4fefee57 3793 trans->ctx.chain->use--;
b380e5c7
PNA		 3794 list_del_rcu(&nft_trans_rule(trans)->list);
3795 break;
3796 case NFT_MSG_DELRULE:
4fefee57 3797 trans->ctx.chain->use++;
b380e5c7 3798 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 3799 nft_trans_destroy(trans);
b380e5c7 3800 break;
958bee14 3801 case NFT_MSG_NEWSET:
4fefee57 3802 trans->ctx.table->use--;
e688a7f8 3803 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 3804 break;
3805 case NFT_MSG_DELSET:
4fefee57 3806 trans->ctx.table->use++;
e688a7f8
PNA		 3807 list_add_tail_rcu(&nft_trans_set(trans)->list,
3808 &trans->ctx.table->sets);
958bee14
PNA		 3809 nft_trans_destroy(trans);
3810 break;
60319eb1 3811 case NFT_MSG_NEWSETELEM:
4fefee57 3812 nft_trans_elem_set(trans)->nelems--;
02263db0 3813 te = (struct nft_trans_elem *)trans->data;
fe2811eb 3814
02263db0 3815 te->set->ops->get(te->set, &te->elem);
02263db0 3816 te->set->ops->remove(te->set, &te->elem);
60319eb1
PNA		 3817 break;
3818 case NFT_MSG_DELSETELEM:
4fefee57 3819 nft_trans_elem_set(trans)->nelems++;
60319eb1
PNA		 3820 nft_trans_destroy(trans);
3821 break;
37082f93 3822 }
37082f93
PNA		 3823 }
3824
b326dd37
PNA		 3825 synchronize_rcu();
3826
a1cee076
PNA		 3827 list_for_each_entry_safe_reverse(trans, next,
3828 &net->nft.commit_list, list) {
c7c32e72 3829 list_del(&trans->list);
b326dd37 3830 nf_tables_abort_release(trans);
37082f93
PNA		 3831 }
3832
3833 return 0;
3834}
3835
96518518
PM		 3836static const struct nfnetlink_subsystem nf_tables_subsys = {
3837 .name = "nf_tables",
3838 .subsys_id = NFNL_SUBSYS_NFTABLES,
3839 .cb_count = NFT_MSG_MAX,
3840 .cb = nf_tables_cb,
0628b123
PNA		 3841 .commit = nf_tables_commit,
3842 .abort = nf_tables_abort,
96518518
PM		 3843};
3844
7210e4e3
PNA		 3845int nft_chain_validate_dependency(const struct nft_chain *chain,
3846 enum nft_chain_type type)
3847{
3848 const struct nft_base_chain *basechain;
3849
3850 if (chain->flags & NFT_BASE_CHAIN) {
3851 basechain = nft_base_chain(chain);
3852 if (basechain->type->type != type)
3853 return -EOPNOTSUPP;
3854 }
3855 return 0;
3856}
3857EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
3858
75e8d06d
PNA		 3859int nft_chain_validate_hooks(const struct nft_chain *chain,
3860 unsigned int hook_flags)
3861{
3862 struct nft_base_chain *basechain;
3863
3864 if (chain->flags & NFT_BASE_CHAIN) {
3865 basechain = nft_base_chain(chain);
3866
3867 if ((1 << basechain->ops[0].hooknum) & hook_flags)
3868 return 0;
3869
3870 return -EOPNOTSUPP;
3871 }
3872
3873 return 0;
3874}
3875EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
3876
20a69341
PM		 3877/*
3878 * Loop detection - walk through the ruleset beginning at the destination chain
3879 * of a new jump until either the source chain is reached (loop) or all
3880 * reachable chains have been traversed.
3881 *
3882 * The loop check is performed whenever a new jump verdict is added to an
3883 * expression or verdict map or a verdict map is bound to a new chain.
3884 */
3885
3886static int nf_tables_check_loops(const struct nft_ctx *ctx,
3887 const struct nft_chain *chain);
3888
3889static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3890 const struct nft_set *set,
3891 const struct nft_set_iter *iter,
3892 const struct nft_set_elem *elem)
3893{
fe2811eb
PM		 3894 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3895 const struct nft_data *data;
3896
3897 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3898 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 3899 return 0;
3900
fe2811eb
PM		 3901 data = nft_set_ext_data(ext);
3902 switch (data->verdict) {
20a69341
PM		 3903 case NFT_JUMP:
3904 case NFT_GOTO:
fe2811eb 3905 return nf_tables_check_loops(ctx, data->chain);
20a69341
PM		 3906 default:
3907 return 0;
3908 }
3909}
3910
3911static int nf_tables_check_loops(const struct nft_ctx *ctx,
3912 const struct nft_chain *chain)
3913{
3914 const struct nft_rule *rule;
3915 const struct nft_expr *expr, *last;
20a69341
PM		 3916 const struct nft_set *set;
3917 struct nft_set_binding *binding;
3918 struct nft_set_iter iter;
20a69341
PM		 3919
3920 if (ctx->chain == chain)
3921 return -ELOOP;
3922
3923 list_for_each_entry(rule, &chain->rules, list) {
3924 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 3925 const struct nft_data *data = NULL;
3926 int err;
3927
3928 if (!expr->ops->validate)
20a69341
PM		 3929 continue;
3930
0ca743a5
PNA		 3931 err = expr->ops->validate(ctx, expr, &data);
3932 if (err < 0)
3933 return err;
3934
20a69341 3935 if (data == NULL)
0ca743a5 3936 continue;
20a69341
PM		 3937
3938 switch (data->verdict) {
3939 case NFT_JUMP:
3940 case NFT_GOTO:
3941 err = nf_tables_check_loops(ctx, data->chain);
3942 if (err < 0)
3943 return err;
3944 default:
3945 break;
3946 }
3947 }
3948 }
3949
3950 list_for_each_entry(set, &ctx->table->sets, list) {
3951 if (!(set->flags & NFT_SET_MAP) ||
3952 set->dtype != NFT_DATA_VERDICT)
3953 continue;
3954
3955 list_for_each_entry(binding, &set->bindings, list) {
3956 if (binding->chain != chain)
3957 continue;
3958
3959 iter.skip = 0;
3960 iter.count = 0;
3961 iter.err = 0;
3962 iter.fn = nf_tables_loop_check_setelem;
3963
3964 set->ops->walk(ctx, set, &iter);
3965 if (iter.err < 0)
3966 return iter.err;
3967 }
3968 }
3969
3970 return 0;
3971}
3972
96518518
PM		 3973/**
3974 * nft_validate_input_register - validate an expressions' input register
3975 *
3976 * @reg: the register number
3977 *
3978 * Validate that the input register is one of the general purpose
3979 * registers.
3980 */
3981int nft_validate_input_register(enum nft_registers reg)
3982{
3983 if (reg <= NFT_REG_VERDICT)
3984 return -EINVAL;
3985 if (reg > NFT_REG_MAX)
3986 return -ERANGE;
3987 return 0;
3988}
3989EXPORT_SYMBOL_GPL(nft_validate_input_register);
3990
3991/**
3992 * nft_validate_output_register - validate an expressions' output register
3993 *
3994 * @reg: the register number
3995 *
3996 * Validate that the output register is one of the general purpose
3997 * registers or the verdict register.
3998 */
3999int nft_validate_output_register(enum nft_registers reg)
4000{
4001 if (reg < NFT_REG_VERDICT)
4002 return -EINVAL;
4003 if (reg > NFT_REG_MAX)
4004 return -ERANGE;
4005 return 0;
4006}
4007EXPORT_SYMBOL_GPL(nft_validate_output_register);
4008
4009/**
4010 * nft_validate_data_load - validate an expressions' data load
4011 *
4012 * @ctx: context of the expression performing the load
4013 * @reg: the destination register number
4014 * @data: the data to load
4015 * @type: the data type
4016 *
4017 * Validate that a data load uses the appropriate data type for
4018 * the destination register. A value of NULL for the data means
4019 * that its runtime gathered data, which is always of type
4020 * NFT_DATA_VALUE.
4021 */
4022int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
4023 const struct nft_data *data,
4024 enum nft_data_types type)
4025{
20a69341
PM		 4026 int err;
4027
96518518
PM		 4028 switch (reg) {
4029 case NFT_REG_VERDICT:
4030 if (data == NULL || type != NFT_DATA_VERDICT)
4031 return -EINVAL;
20a69341
PM		 4032
4033 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
4034 err = nf_tables_check_loops(ctx, data->chain);
4035 if (err < 0)
4036 return err;
4037
4038 if (ctx->chain->level + 1 > data->chain->level) {
4039 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4040 return -EMLINK;
4041 data->chain->level = ctx->chain->level + 1;
4042 }
4043 }
4044
96518518
PM		 4045 return 0;
4046 default:
4047 if (data != NULL && type != NFT_DATA_VALUE)
4048 return -EINVAL;
4049 return 0;
4050 }
4051}
4052EXPORT_SYMBOL_GPL(nft_validate_data_load);
4053
4054static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4055 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4056 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4057 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4058};
4059
4060static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4061 struct nft_data_desc *desc, const struct nlattr *nla)
4062{
4063 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4064 struct nft_chain *chain;
4065 int err;
4066
4067 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4068 if (err < 0)
4069 return err;
4070
4071 if (!tb[NFTA_VERDICT_CODE])
4072 return -EINVAL;
4073 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
4074
4075 switch (data->verdict) {
e0abdadc
PM		 4076 default:
4077 switch (data->verdict & NF_VERDICT_MASK) {
4078 case NF_ACCEPT:
4079 case NF_DROP:
4080 case NF_QUEUE:
4081 break;
4082 default:
4083 return -EINVAL;
4084 }
4085 /* fall through */
96518518
PM		 4086 case NFT_CONTINUE:
4087 case NFT_BREAK:
4088 case NFT_RETURN:
4089 desc->len = sizeof(data->verdict);
4090 break;
4091 case NFT_JUMP:
4092 case NFT_GOTO:
4093 if (!tb[NFTA_VERDICT_CHAIN])
4094 return -EINVAL;
4095 chain = nf_tables_chain_lookup(ctx->table,
4096 tb[NFTA_VERDICT_CHAIN]);
4097 if (IS_ERR(chain))
4098 return PTR_ERR(chain);
4099 if (chain->flags & NFT_BASE_CHAIN)
4100 return -EOPNOTSUPP;
4101
96518518
PM		 4102 chain->use++;
4103 data->chain = chain;
4104 desc->len = sizeof(data);
4105 break;
96518518
PM		 4106 }
4107
4108 desc->type = NFT_DATA_VERDICT;
4109 return 0;
4110}
4111
4112static void nft_verdict_uninit(const struct nft_data *data)
4113{
4114 switch (data->verdict) {
4115 case NFT_JUMP:
4116 case NFT_GOTO:
4117 data->chain->use--;
4118 break;
4119 }
4120}
4121
4122static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4123{
4124 struct nlattr *nest;
4125
4126 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4127 if (!nest)
4128 goto nla_put_failure;
4129
4130 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
4131 goto nla_put_failure;
4132
4133 switch (data->verdict) {
4134 case NFT_JUMP:
4135 case NFT_GOTO:
4136 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
4137 goto nla_put_failure;
4138 }
4139 nla_nest_end(skb, nest);
4140 return 0;
4141
4142nla_put_failure:
4143 return -1;
4144}
4145
4146static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4147 struct nft_data_desc *desc, const struct nlattr *nla)
4148{
4149 unsigned int len;
4150
4151 len = nla_len(nla);
4152 if (len == 0)
4153 return -EINVAL;
4154 if (len > sizeof(data->data))
4155 return -EOVERFLOW;
4156
4157 nla_memcpy(data->data, nla, sizeof(data->data));
4158 desc->type = NFT_DATA_VALUE;
4159 desc->len = len;
4160 return 0;
4161}
4162
4163static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4164 unsigned int len)
4165{
4166 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4167}
4168
4169static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4170 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4171 .len = FIELD_SIZEOF(struct nft_data, data) },
4172 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4173};
4174
4175/**
4176 * nft_data_init - parse nf_tables data netlink attributes
4177 *
4178 * @ctx: context of the expression using the data
4179 * @data: destination struct nft_data
4180 * @desc: data description
4181 * @nla: netlink attribute containing data
4182 *
4183 * Parse the netlink data attributes and initialize a struct nft_data.
4184 * The type and length of data are returned in the data description.
4185 *
4186 * The caller can indicate that it only wants to accept data of type
4187 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4188 */
4189int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4190 struct nft_data_desc *desc, const struct nlattr *nla)
4191{
4192 struct nlattr *tb[NFTA_DATA_MAX + 1];
4193 int err;
4194
4195 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4196 if (err < 0)
4197 return err;
4198
4199 if (tb[NFTA_DATA_VALUE])
4200 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4201 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4202 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4203 return -EINVAL;
4204}
4205EXPORT_SYMBOL_GPL(nft_data_init);
4206
4207/**
4208 * nft_data_uninit - release a nft_data item
4209 *
4210 * @data: struct nft_data to release
4211 * @type: type of data
4212 *
4213 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4214 * all others need to be released by calling this function.
4215 */
4216void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4217{
4218 switch (type) {
4219 case NFT_DATA_VALUE:
4220 return;
4221 case NFT_DATA_VERDICT:
4222 return nft_verdict_uninit(data);
4223 default:
4224 WARN_ON(1);
4225 }
4226}
4227EXPORT_SYMBOL_GPL(nft_data_uninit);
4228
4229int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4230 enum nft_data_types type, unsigned int len)
4231{
4232 struct nlattr *nest;
4233 int err;
4234
4235 nest = nla_nest_start(skb, attr);
4236 if (nest == NULL)
4237 return -1;
4238
4239 switch (type) {
4240 case NFT_DATA_VALUE:
4241 err = nft_value_dump(skb, data, len);
4242 break;
4243 case NFT_DATA_VERDICT:
4244 err = nft_verdict_dump(skb, data);
4245 break;
4246 default:
4247 err = -EINVAL;
4248 WARN_ON(1);
4249 }
4250
4251 nla_nest_end(skb, nest);
4252 return err;
4253}
4254EXPORT_SYMBOL_GPL(nft_data_dump);
4255
99633ab2
PNA		 4256static int nf_tables_init_net(struct net *net)
4257{
4258 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 4259 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 4260 net->nft.base_seq = 1;
99633ab2
PNA		 4261 return 0;
4262}
4263
4264static struct pernet_operations nf_tables_net_ops = {
4265 .init = nf_tables_init_net,
4266};
4267
96518518
PM		 4268static int __init nf_tables_module_init(void)
4269{
4270 int err;
4271
4272 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4273 GFP_KERNEL);
4274 if (info == NULL) {
4275 err = -ENOMEM;
4276 goto err1;
4277 }
4278
4279 err = nf_tables_core_module_init();
4280 if (err < 0)
4281 goto err2;
4282
4283 err = nfnetlink_subsys_register(&nf_tables_subsys);
4284 if (err < 0)
4285 goto err3;
4286
4287 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 4288 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 4289err3:
4290 nf_tables_core_module_exit();
4291err2:
4292 kfree(info);
4293err1:
4294 return err;
4295}
4296
4297static void __exit nf_tables_module_exit(void)
4298{
99633ab2 4299 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 4300 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 4301 rcu_barrier();
96518518
PM		 4302 nf_tables_core_module_exit();
4303 kfree(info);
4304}
4305
4306module_init(nf_tables_module_init);
4307module_exit(nf_tables_module_exit);
4308
4309MODULE_LICENSE("GPL");
4310MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4311MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux 6.x block layer and io_uring tree(s)