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netfilter: remove defensive check on malformed packets from raw sockets
[mirror_ubuntu-jammy-kernel.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>
1ff75a3e 16#include <linux/vmalloc.h>
96518518
PM		 17#include <linux/netfilter.h>
18#include <linux/netfilter/nfnetlink.h>
19#include <linux/netfilter/nf_tables.h>
20#include <net/netfilter/nf_tables_core.h>
21#include <net/netfilter/nf_tables.h>
99633ab2 22#include <net/net_namespace.h>
96518518
PM		 23#include <net/sock.h>
24
96518518 25static LIST_HEAD(nf_tables_expressions);
e5009240 26static LIST_HEAD(nf_tables_objects);
96518518
PM		 27
28/**
29 * nft_register_afinfo - register nf_tables address family info
30 *
31 * @afi: address family info to register
32 *
33 * Register the address family for use with nf_tables. Returns zero on
34 * success or a negative errno code otherwise.
35 */
99633ab2 36int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 37{
38 INIT_LIST_HEAD(&afi->tables);
39 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 40 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 41 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 return 0;
43}
44EXPORT_SYMBOL_GPL(nft_register_afinfo);
45
df05ef87
PNA		 46static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47
96518518
PM		 48/**
49 * nft_unregister_afinfo - unregister nf_tables address family info
50 *
51 * @afi: address family info to unregister
52 *
53 * Unregister the address family for use with nf_tables.
54 */
df05ef87 55void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 56{
57 nfnl_lock(NFNL_SUBSYS_NFTABLES);
df05ef87 58 __nft_release_afinfo(net, afi);
e688a7f8 59 list_del_rcu(&afi->list);
96518518
PM		 60 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
61}
62EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
63
99633ab2 64static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 65{
66 struct nft_af_info *afi;
67
99633ab2 68 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 69 if (afi->family == family)
70 return afi;
71 }
72 return NULL;
73}
74
99633ab2
PNA		 75static struct nft_af_info *
76nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 77{
78 struct nft_af_info *afi;
79
99633ab2 80 afi = nft_afinfo_lookup(net, family);
96518518
PM		 81 if (afi != NULL)
82 return afi;
83#ifdef CONFIG_MODULES
84 if (autoload) {
85 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
86 request_module("nft-afinfo-%u", family);
87 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 88 afi = nft_afinfo_lookup(net, family);
96518518
PM		 89 if (afi != NULL)
90 return ERR_PTR(-EAGAIN);
91 }
92#endif
93 return ERR_PTR(-EAFNOSUPPORT);
94}
95
7c95f6d8 96static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 97 struct net *net,
7c95f6d8
PNA		 98 const struct sk_buff *skb,
99 const struct nlmsghdr *nlh,
100 struct nft_af_info *afi,
101 struct nft_table *table,
102 struct nft_chain *chain,
103 const struct nlattr * const *nla)
104{
633c9a84 105 ctx->net = net;
128ad332
PNA		 106 ctx->afi = afi;
107 ctx->table = table;
108 ctx->chain = chain;
109 ctx->nla = nla;
110 ctx->portid = NETLINK_CB(skb).portid;
111 ctx->report = nlmsg_report(nlh);
112 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 113}
114
8411b644
PNA		 115static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
116 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 117{
118 struct nft_trans *trans;
119
8411b644 120 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 121 if (trans == NULL)
122 return NULL;
123
b380e5c7 124 trans->msg_type = msg_type;
1081d11b
PNA		 125 trans->ctx = *ctx;
126
127 return trans;
128}
129
8411b644
PNA		 130static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
131 int msg_type, u32 size)
132{
133 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
134}
135
1081d11b
PNA		 136static void nft_trans_destroy(struct nft_trans *trans)
137{
138 list_del(&trans->list);
139 kfree(trans);
140}
141
c974a3a3
PNA		 142static int nf_tables_register_hook(struct net *net,
143 const struct nft_table *table,
144 struct nft_chain *chain)
d8ee8f7c
PNA		 145{
146 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 147 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 148 return 0;
149
c974a3a3 150 return nf_register_net_hook(net, &nft_base_chain(chain)->ops);
d8ee8f7c
PNA		 151}
152
c974a3a3
PNA		 153static void nf_tables_unregister_hook(struct net *net,
154 const struct nft_table *table,
155 struct nft_chain *chain)
c5598794 156{
d8ee8f7c 157 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 158 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 159 return;
160
c974a3a3 161 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
c5598794
AB		 162}
163
ee01d542
AB		 164static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
165{
166 struct nft_trans *trans;
167
168 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
169 if (trans == NULL)
170 return -ENOMEM;
171
172 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 173 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 174
175 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
176 return 0;
177}
178
179static int nft_deltable(struct nft_ctx *ctx)
180{
181 int err;
182
183 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
184 if (err < 0)
185 return err;
186
f2a6d766 187 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 188 return err;
189}
190
191static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
192{
193 struct nft_trans *trans;
194
195 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
196 if (trans == NULL)
197 return -ENOMEM;
198
199 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 200 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 201
202 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
203 return 0;
204}
205
206static int nft_delchain(struct nft_ctx *ctx)
207{
208 int err;
209
210 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
211 if (err < 0)
212 return err;
213
214 ctx->table->use--;
664b0f8c 215 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542
AB		 216
217 return err;
218}
219
ee01d542
AB		 220static int
221nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
222{
223 /* You cannot delete the same rule twice */
889f7ee7
PNA		 224 if (nft_is_active_next(ctx->net, rule)) {
225 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 226 ctx->chain->use--;
227 return 0;
228 }
229 return -ENOENT;
230}
231
232static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
233 struct nft_rule *rule)
234{
235 struct nft_trans *trans;
236
237 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
238 if (trans == NULL)
239 return NULL;
240
1a94e38d
PNA		 241 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
242 nft_trans_rule_id(trans) =
243 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
244 }
ee01d542
AB		 245 nft_trans_rule(trans) = rule;
246 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
247
248 return trans;
249}
250
251static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
252{
253 struct nft_trans *trans;
254 int err;
255
256 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
257 if (trans == NULL)
258 return -ENOMEM;
259
260 err = nf_tables_delrule_deactivate(ctx, rule);
261 if (err < 0) {
262 nft_trans_destroy(trans);
263 return err;
264 }
265
266 return 0;
267}
268
269static int nft_delrule_by_chain(struct nft_ctx *ctx)
270{
271 struct nft_rule *rule;
272 int err;
273
274 list_for_each_entry(rule, &ctx->chain->rules, list) {
275 err = nft_delrule(ctx, rule);
276 if (err < 0)
277 return err;
278 }
279 return 0;
280}
281
ee01d542
AB		 282static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
283 struct nft_set *set)
284{
285 struct nft_trans *trans;
286
287 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
288 if (trans == NULL)
289 return -ENOMEM;
290
291 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
292 nft_trans_set_id(trans) =
293 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 294 nft_activate_next(ctx->net, set);
ee01d542
AB		 295 }
296 nft_trans_set(trans) = set;
297 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
298
299 return 0;
300}
301
302static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
303{
304 int err;
305
306 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
307 if (err < 0)
308 return err;
309
37a9cc52 310 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 311 ctx->table->use--;
312
313 return err;
314}
315
e5009240
PNA		 316static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
317 struct nft_object *obj)
318{
319 struct nft_trans *trans;
320
321 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
322 if (trans == NULL)
323 return -ENOMEM;
324
325 if (msg_type == NFT_MSG_NEWOBJ)
326 nft_activate_next(ctx->net, obj);
327
328 nft_trans_obj(trans) = obj;
329 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
330
331 return 0;
332}
333
334static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
335{
336 int err;
337
338 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
339 if (err < 0)
340 return err;
341
342 nft_deactivate_next(ctx->net, obj);
343 ctx->table->use--;
344
345 return err;
346}
347
96518518
PM		 348/*
349 * Tables
350 */
351
352static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 353 const struct nlattr *nla,
354 u8 genmask)
96518518
PM		 355{
356 struct nft_table *table;
357
358 list_for_each_entry(table, &afi->tables, list) {
f2a6d766
PNA		 359 if (!nla_strcmp(nla, table->name) &&
360 nft_active_genmask(table, genmask))
96518518
PM		 361 return table;
362 }
363 return NULL;
364}
365
366static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 367 const struct nlattr *nla,
368 u8 genmask)
96518518
PM		 369{
370 struct nft_table *table;
371
372 if (nla == NULL)
373 return ERR_PTR(-EINVAL);
374
f2a6d766 375 table = nft_table_lookup(afi, nla, genmask);
96518518
PM		 376 if (table != NULL)
377 return table;
378
96518518
PM		 379 return ERR_PTR(-ENOENT);
380}
381
382static inline u64 nf_tables_alloc_handle(struct nft_table *table)
383{
384 return ++table->hgenerator;
385}
386
d8297d4f 387static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 388
2a37d755 389static const struct nf_chain_type *
baae3e62 390__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 391{
392 int i;
393
baae3e62 394 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 395 if (chain_type[family][i] != NULL &&
396 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 397 return chain_type[family][i];
9370761c 398 }
baae3e62 399 return NULL;
9370761c
PNA		 400}
401
2a37d755 402static const struct nf_chain_type *
baae3e62
PM		 403nf_tables_chain_type_lookup(const struct nft_af_info *afi,
404 const struct nlattr *nla,
405 bool autoload)
9370761c 406{
2a37d755 407 const struct nf_chain_type *type;
9370761c
PNA		 408
409 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 410 if (type != NULL)
411 return type;
9370761c 412#ifdef CONFIG_MODULES
93b0806f 413 if (autoload) {
9370761c 414 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 415 request_module("nft-chain-%u-%.*s", afi->family,
416 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 417 nfnl_lock(NFNL_SUBSYS_NFTABLES);
418 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 419 if (type != NULL)
420 return ERR_PTR(-EAGAIN);
9370761c
PNA		 421 }
422#endif
93b0806f 423 return ERR_PTR(-ENOENT);
9370761c
PNA		 424}
425
96518518 426static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 427 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
428 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 429 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 430};
431
84d7fce6
PNA		 432static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
433 u32 portid, u32 seq, int event, u32 flags,
434 int family, const struct nft_table *table)
96518518
PM		 435{
436 struct nlmsghdr *nlh;
437 struct nfgenmsg *nfmsg;
438
dedb67c4 439 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 440 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
441 if (nlh == NULL)
442 goto nla_put_failure;
443
444 nfmsg = nlmsg_data(nlh);
445 nfmsg->nfgen_family = family;
446 nfmsg->version = NFNETLINK_V0;
84d7fce6 447 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 448
9ddf6323 449 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 450 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
451 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 452 goto nla_put_failure;
453
053c095a
JB		 454 nlmsg_end(skb, nlh);
455 return 0;
96518518
PM		 456
457nla_put_failure:
458 nlmsg_trim(skb, nlh);
459 return -1;
460}
461
25e94a99 462static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 463{
464 struct sk_buff *skb;
96518518
PM		 465 int err;
466
128ad332
PNA		 467 if (!ctx->report &&
468 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 469 return;
96518518 470
96518518
PM		 471 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
472 if (skb == NULL)
473 goto err;
474
84d7fce6
PNA		 475 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
476 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 477 if (err < 0) {
478 kfree_skb(skb);
479 goto err;
480 }
481
25e94a99
PNA		 482 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
483 ctx->report, GFP_KERNEL);
484 return;
96518518 485err:
25e94a99 486 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 487}
488
489static int nf_tables_dump_tables(struct sk_buff *skb,
490 struct netlink_callback *cb)
491{
492 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
493 const struct nft_af_info *afi;
494 const struct nft_table *table;
495 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 496 struct net *net = sock_net(skb->sk);
96518518
PM		 497 int family = nfmsg->nfgen_family;
498
e688a7f8 499 rcu_read_lock();
38e029f1
PNA		 500 cb->seq = net->nft.base_seq;
501
e688a7f8 502 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 503 if (family != NFPROTO_UNSPEC && family != afi->family)
504 continue;
505
e688a7f8 506 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 507 if (idx < s_idx)
508 goto cont;
509 if (idx > s_idx)
510 memset(&cb->args[1], 0,
511 sizeof(cb->args) - sizeof(cb->args[0]));
f2a6d766
PNA		 512 if (!nft_is_active(net, table))
513 continue;
84d7fce6 514 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 515 NETLINK_CB(cb->skb).portid,
516 cb->nlh->nlmsg_seq,
517 NFT_MSG_NEWTABLE,
518 NLM_F_MULTI,
519 afi->family, table) < 0)
520 goto done;
38e029f1
PNA		 521
522 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 523cont:
524 idx++;
525 }
526 }
527done:
e688a7f8 528 rcu_read_unlock();
96518518
PM		 529 cb->args[0] = idx;
530 return skb->len;
531}
532
7b8002a1
PNA		 533static int nf_tables_gettable(struct net *net, struct sock *nlsk,
534 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 535 const struct nlattr * const nla[],
536 struct netlink_ext_ack *extack)
96518518
PM		 537{
538 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 539 u8 genmask = nft_genmask_cur(net);
96518518
PM		 540 const struct nft_af_info *afi;
541 const struct nft_table *table;
542 struct sk_buff *skb2;
543 int family = nfmsg->nfgen_family;
544 int err;
545
546 if (nlh->nlmsg_flags & NLM_F_DUMP) {
547 struct netlink_dump_control c = {
548 .dump = nf_tables_dump_tables,
549 };
550 return netlink_dump_start(nlsk, skb, nlh, &c);
551 }
552
99633ab2 553 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 554 if (IS_ERR(afi))
555 return PTR_ERR(afi);
556
f2a6d766 557 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 558 if (IS_ERR(table))
559 return PTR_ERR(table);
560
561 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
562 if (!skb2)
563 return -ENOMEM;
564
84d7fce6 565 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 566 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
567 family, table);
568 if (err < 0)
569 goto err;
570
571 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
572
573err:
574 kfree_skb(skb2);
575 return err;
576}
577
10435c11
F		 578static void _nf_tables_table_disable(struct net *net,
579 const struct nft_af_info *afi,
580 struct nft_table *table,
581 u32 cnt)
582{
583 struct nft_chain *chain;
584 u32 i = 0;
585
586 list_for_each_entry(chain, &table->chains, list) {
587 if (!nft_is_active_next(net, chain))
588 continue;
f323d954 589 if (!nft_is_base_chain(chain))
10435c11
F		 590 continue;
591
592 if (cnt && i++ == cnt)
593 break;
594
c974a3a3 595 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
10435c11
F		 596 }
597}
598
664b0f8c
PNA		 599static int nf_tables_table_enable(struct net *net,
600 const struct nft_af_info *afi,
115a60b1 601 struct nft_table *table)
9ddf6323
PNA		 602{
603 struct nft_chain *chain;
604 int err, i = 0;
605
606 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 607 if (!nft_is_active_next(net, chain))
608 continue;
f323d954 609 if (!nft_is_base_chain(chain))
d2012975
PNA		 610 continue;
611
c974a3a3 612 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
9ddf6323
PNA		 613 if (err < 0)
614 goto err;
615
616 i++;
617 }
618 return 0;
619err:
10435c11
F		 620 if (i)
621 _nf_tables_table_disable(net, afi, table, i);
9ddf6323
PNA		 622 return err;
623}
624
664b0f8c
PNA		 625static void nf_tables_table_disable(struct net *net,
626 const struct nft_af_info *afi,
d8ee8f7c 627 struct nft_table *table)
9ddf6323 628{
10435c11 629 _nf_tables_table_disable(net, afi, table, 0);
9ddf6323
PNA		 630}
631
e1aaca93 632static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 633{
55dd6f93 634 struct nft_trans *trans;
e1aaca93 635 u32 flags;
55dd6f93 636 int ret = 0;
9ddf6323 637
e1aaca93
PNA		 638 if (!ctx->nla[NFTA_TABLE_FLAGS])
639 return 0;
9ddf6323 640
e1aaca93
PNA		 641 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
642 if (flags & ~NFT_TABLE_F_DORMANT)
643 return -EINVAL;
644
63283dd2
PNA		 645 if (flags == ctx->table->flags)
646 return 0;
647
55dd6f93
PNA		 648 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
649 sizeof(struct nft_trans_table));
650 if (trans == NULL)
651 return -ENOMEM;
9ddf6323 652
e1aaca93
PNA		 653 if ((flags & NFT_TABLE_F_DORMANT) &&
654 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 655 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 656 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
657 ctx->table->flags & NFT_TABLE_F_DORMANT) {
664b0f8c 658 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
55dd6f93 659 if (ret >= 0) {
e1aaca93 660 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 661 nft_trans_table_enable(trans) = true;
9ddf6323 662 }
9ddf6323 663 }
e1aaca93
PNA		 664 if (ret < 0)
665 goto err;
9ddf6323 666
55dd6f93
PNA		 667 nft_trans_table_update(trans) = true;
668 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
669 return 0;
9ddf6323 670err:
55dd6f93 671 nft_trans_destroy(trans);
9ddf6323
PNA		 672 return ret;
673}
674
633c9a84
PNA		 675static int nf_tables_newtable(struct net *net, struct sock *nlsk,
676 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 677 const struct nlattr * const nla[],
678 struct netlink_ext_ack *extack)
96518518
PM		 679{
680 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 681 u8 genmask = nft_genmask_next(net);
96518518
PM		 682 const struct nlattr *name;
683 struct nft_af_info *afi;
684 struct nft_table *table;
685 int family = nfmsg->nfgen_family;
c5c1f975 686 u32 flags = 0;
e1aaca93 687 struct nft_ctx ctx;
55dd6f93 688 int err;
96518518 689
99633ab2 690 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 691 if (IS_ERR(afi))
692 return PTR_ERR(afi);
693
694 name = nla[NFTA_TABLE_NAME];
f2a6d766 695 table = nf_tables_table_lookup(afi, name, genmask);
96518518
PM		 696 if (IS_ERR(table)) {
697 if (PTR_ERR(table) != -ENOENT)
698 return PTR_ERR(table);
1a28ad74 699 } else {
96518518
PM		 700 if (nlh->nlmsg_flags & NLM_F_EXCL)
701 return -EEXIST;
702 if (nlh->nlmsg_flags & NLM_F_REPLACE)
703 return -EOPNOTSUPP;
e1aaca93 704
633c9a84 705 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 706 return nf_tables_updtable(&ctx);
96518518
PM		 707 }
708
c5c1f975
PM		 709 if (nla[NFTA_TABLE_FLAGS]) {
710 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
711 if (flags & ~NFT_TABLE_F_DORMANT)
712 return -EINVAL;
713 }
714
ebddf1a8 715 err = -EAFNOSUPPORT;
7047f9d0 716 if (!try_module_get(afi->owner))
ebddf1a8 717 goto err1;
7047f9d0 718
ffdb210e 719 err = -ENOMEM;
1cae565e 720 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 721 if (table == NULL)
ebddf1a8 722 goto err2;
96518518 723
e46abbcc
PS		 724 table->name = nla_strdup(name, GFP_KERNEL);
725 if (table->name == NULL)
726 goto err3;
727
96518518 728 INIT_LIST_HEAD(&table->chains);
20a69341 729 INIT_LIST_HEAD(&table->sets);
e5009240 730 INIT_LIST_HEAD(&table->objects);
c5c1f975 731 table->flags = flags;
9ddf6323 732
633c9a84 733 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 734 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 735 if (err < 0)
e46abbcc 736 goto err4;
ffdb210e 737
e688a7f8 738 list_add_tail_rcu(&table->list, &afi->tables);
96518518 739 return 0;
e46abbcc
PS		 740err4:
741 kfree(table->name);
ebddf1a8 742err3:
ffdb210e 743 kfree(table);
ebddf1a8 744err2:
ffdb210e 745 module_put(afi->owner);
ebddf1a8 746err1:
ffdb210e 747 return err;
96518518
PM		 748}
749
b9ac12ef
AB		 750static int nft_flush_table(struct nft_ctx *ctx)
751{
752 int err;
753 struct nft_chain *chain, *nc;
e5009240 754 struct nft_object *obj, *ne;
b9ac12ef
AB		 755 struct nft_set *set, *ns;
756
a2f18db0 757 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 758 if (!nft_is_active_next(ctx->net, chain))
759 continue;
760
b9ac12ef
AB		 761 ctx->chain = chain;
762
763 err = nft_delrule_by_chain(ctx);
764 if (err < 0)
765 goto out;
b9ac12ef
AB		 766 }
767
768 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 769 if (!nft_is_active_next(ctx->net, set))
770 continue;
771
408070d6 772 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 773 !list_empty(&set->bindings))
774 continue;
775
776 err = nft_delset(ctx, set);
777 if (err < 0)
778 goto out;
779 }
780
e5009240
PNA		 781 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
782 err = nft_delobj(ctx, obj);
783 if (err < 0)
784 goto out;
785 }
786
a2f18db0 787 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 788 if (!nft_is_active_next(ctx->net, chain))
789 continue;
790
a2f18db0
PNA		 791 ctx->chain = chain;
792
793 err = nft_delchain(ctx);
794 if (err < 0)
795 goto out;
796 }
797
b9ac12ef
AB		 798 err = nft_deltable(ctx);
799out:
800 return err;
801}
802
803static int nft_flush(struct nft_ctx *ctx, int family)
804{
805 struct nft_af_info *afi;
806 struct nft_table *table, *nt;
807 const struct nlattr * const *nla = ctx->nla;
808 int err = 0;
809
810 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
811 if (family != AF_UNSPEC && afi->family != family)
812 continue;
813
814 ctx->afi = afi;
815 list_for_each_entry_safe(table, nt, &afi->tables, list) {
f2a6d766
PNA		 816 if (!nft_is_active_next(ctx->net, table))
817 continue;
818
b9ac12ef
AB		 819 if (nla[NFTA_TABLE_NAME] &&
820 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
821 continue;
822
823 ctx->table = table;
824
825 err = nft_flush_table(ctx);
826 if (err < 0)
827 goto out;
828 }
829 }
830out:
831 return err;
832}
833
633c9a84
PNA		 834static int nf_tables_deltable(struct net *net, struct sock *nlsk,
835 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 836 const struct nlattr * const nla[],
837 struct netlink_ext_ack *extack)
96518518
PM		 838{
839 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 840 u8 genmask = nft_genmask_next(net);
96518518
PM		 841 struct nft_af_info *afi;
842 struct nft_table *table;
ee01d542 843 int family = nfmsg->nfgen_family;
55dd6f93 844 struct nft_ctx ctx;
96518518 845
633c9a84 846 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 847 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
848 return nft_flush(&ctx, family);
849
99633ab2 850 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 851 if (IS_ERR(afi))
852 return PTR_ERR(afi);
853
f2a6d766 854 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 855 if (IS_ERR(table))
856 return PTR_ERR(table);
96518518 857
a8278400
PNA		 858 if (nlh->nlmsg_flags & NLM_F_NONREC &&
859 table->use > 0)
860 return -EBUSY;
861
b9ac12ef
AB		 862 ctx.afi = afi;
863 ctx.table = table;
55dd6f93 864
b9ac12ef 865 return nft_flush_table(&ctx);
96518518
PM		 866}
867
55dd6f93
PNA		 868static void nf_tables_table_destroy(struct nft_ctx *ctx)
869{
4fefee57
PNA		 870 BUG_ON(ctx->table->use > 0);
871
e46abbcc 872 kfree(ctx->table->name);
55dd6f93
PNA		 873 kfree(ctx->table);
874 module_put(ctx->afi->owner);
875}
876
2a37d755 877int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 878{
9370761c 879 int err = 0;
96518518 880
d8297d4f
FW		 881 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
882 return -EINVAL;
883
96518518 884 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 885 if (chain_type[ctype->family][ctype->type] != NULL) {
886 err = -EBUSY;
887 goto out;
96518518 888 }
9370761c
PNA		 889 chain_type[ctype->family][ctype->type] = ctype;
890out:
96518518
PM		 891 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
892 return err;
893}
9370761c 894EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 895
2a37d755 896void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 897{
96518518 898 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 899 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 900 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
901}
9370761c 902EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 903
904/*
905 * Chains
906 */
907
908static struct nft_chain *
664b0f8c
PNA		 909nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
910 u8 genmask)
96518518
PM		 911{
912 struct nft_chain *chain;
913
914 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 915 if (chain->handle == handle &&
916 nft_active_genmask(chain, genmask))
96518518
PM		 917 return chain;
918 }
919
920 return ERR_PTR(-ENOENT);
921}
922
923static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
664b0f8c
PNA		 924 const struct nlattr *nla,
925 u8 genmask)
96518518
PM		 926{
927 struct nft_chain *chain;
928
929 if (nla == NULL)
930 return ERR_PTR(-EINVAL);
931
932 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 933 if (!nla_strcmp(nla, chain->name) &&
934 nft_active_genmask(chain, genmask))
96518518
PM		 935 return chain;
936 }
937
938 return ERR_PTR(-ENOENT);
939}
940
941static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 942 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
943 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 944 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
945 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
946 .len = NFT_CHAIN_MAXNAMELEN - 1 },
947 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 948 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 949 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 950 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 951};
952
953static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
954 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
955 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 956 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
957 .len = IFNAMSIZ - 1 },
96518518
PM		 958};
959
0ca743a5
PNA		 960static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
961{
962 struct nft_stats *cpu_stats, total;
963 struct nlattr *nest;
ce355e20
ED		 964 unsigned int seq;
965 u64 pkts, bytes;
0ca743a5
PNA		 966 int cpu;
967
968 memset(&total, 0, sizeof(total));
969 for_each_possible_cpu(cpu) {
970 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 971 do {
972 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
973 pkts = cpu_stats->pkts;
974 bytes = cpu_stats->bytes;
975 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
976 total.pkts += pkts;
977 total.bytes += bytes;
0ca743a5
PNA		 978 }
979 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
980 if (nest == NULL)
981 goto nla_put_failure;
982
b46f6ded
ND		 983 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
984 NFTA_COUNTER_PAD) ||
985 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
986 NFTA_COUNTER_PAD))
0ca743a5
PNA		 987 goto nla_put_failure;
988
989 nla_nest_end(skb, nest);
990 return 0;
991
992nla_put_failure:
993 return -ENOSPC;
994}
995
84d7fce6
PNA		 996static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
997 u32 portid, u32 seq, int event, u32 flags,
998 int family, const struct nft_table *table,
96518518
PM		 999 const struct nft_chain *chain)
1000{
1001 struct nlmsghdr *nlh;
1002 struct nfgenmsg *nfmsg;
1003
dedb67c4 1004 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1005 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1006 if (nlh == NULL)
1007 goto nla_put_failure;
1008
1009 nfmsg = nlmsg_data(nlh);
1010 nfmsg->nfgen_family = family;
1011 nfmsg->version = NFNETLINK_V0;
84d7fce6 1012 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1013
1014 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1015 goto nla_put_failure;
b46f6ded
ND		 1016 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1017 NFTA_CHAIN_PAD))
96518518
PM		 1018 goto nla_put_failure;
1019 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1020 goto nla_put_failure;
1021
f323d954 1022 if (nft_is_base_chain(chain)) {
0ca743a5 1023 const struct nft_base_chain *basechain = nft_base_chain(chain);
c974a3a3 1024 const struct nf_hook_ops *ops = &basechain->ops;
0ca743a5
PNA		 1025 struct nlattr *nest;
1026
1027 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 1028 if (nest == NULL)
1029 goto nla_put_failure;
1030 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1031 goto nla_put_failure;
1032 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1033 goto nla_put_failure;
2cbce139
PNA		 1034 if (basechain->dev_name[0] &&
1035 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1036 goto nla_put_failure;
96518518 1037 nla_nest_end(skb, nest);
9370761c 1038
0ca743a5
PNA		 1039 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1040 htonl(basechain->policy)))
1041 goto nla_put_failure;
1042
baae3e62
PM		 1043 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1044 goto nla_put_failure;
0ca743a5 1045
5f9bfe0e 1046 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
0ca743a5 1047 goto nla_put_failure;
96518518
PM		 1048 }
1049
0ca743a5
PNA		 1050 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1051 goto nla_put_failure;
1052
053c095a
JB		 1053 nlmsg_end(skb, nlh);
1054 return 0;
96518518
PM		 1055
1056nla_put_failure:
1057 nlmsg_trim(skb, nlh);
1058 return -1;
1059}
1060
25e94a99 1061static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1062{
1063 struct sk_buff *skb;
96518518
PM		 1064 int err;
1065
128ad332
PNA		 1066 if (!ctx->report &&
1067 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1068 return;
96518518 1069
96518518
PM		 1070 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1071 if (skb == NULL)
1072 goto err;
1073
84d7fce6
PNA		 1074 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1075 event, 0, ctx->afi->family, ctx->table,
35151d84 1076 ctx->chain);
96518518
PM		 1077 if (err < 0) {
1078 kfree_skb(skb);
1079 goto err;
1080 }
1081
25e94a99
PNA		 1082 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1083 ctx->report, GFP_KERNEL);
1084 return;
96518518 1085err:
25e94a99 1086 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1087}
1088
1089static int nf_tables_dump_chains(struct sk_buff *skb,
1090 struct netlink_callback *cb)
1091{
1092 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1093 const struct nft_af_info *afi;
1094 const struct nft_table *table;
1095 const struct nft_chain *chain;
1096 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1097 struct net *net = sock_net(skb->sk);
96518518
PM		 1098 int family = nfmsg->nfgen_family;
1099
e688a7f8 1100 rcu_read_lock();
38e029f1
PNA		 1101 cb->seq = net->nft.base_seq;
1102
e688a7f8 1103 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1104 if (family != NFPROTO_UNSPEC && family != afi->family)
1105 continue;
1106
e688a7f8
PNA		 1107 list_for_each_entry_rcu(table, &afi->tables, list) {
1108 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1109 if (idx < s_idx)
1110 goto cont;
1111 if (idx > s_idx)
1112 memset(&cb->args[1], 0,
1113 sizeof(cb->args) - sizeof(cb->args[0]));
664b0f8c
PNA		 1114 if (!nft_is_active(net, chain))
1115 continue;
84d7fce6
PNA		 1116 if (nf_tables_fill_chain_info(skb, net,
1117 NETLINK_CB(cb->skb).portid,
96518518
PM		 1118 cb->nlh->nlmsg_seq,
1119 NFT_MSG_NEWCHAIN,
1120 NLM_F_MULTI,
1121 afi->family, table, chain) < 0)
1122 goto done;
38e029f1
PNA		 1123
1124 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1125cont:
1126 idx++;
1127 }
1128 }
1129 }
1130done:
e688a7f8 1131 rcu_read_unlock();
96518518
PM		 1132 cb->args[0] = idx;
1133 return skb->len;
1134}
1135
7b8002a1
PNA		 1136static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1137 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1138 const struct nlattr * const nla[],
1139 struct netlink_ext_ack *extack)
96518518
PM		 1140{
1141 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1142 u8 genmask = nft_genmask_cur(net);
96518518
PM		 1143 const struct nft_af_info *afi;
1144 const struct nft_table *table;
1145 const struct nft_chain *chain;
1146 struct sk_buff *skb2;
1147 int family = nfmsg->nfgen_family;
1148 int err;
1149
1150 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1151 struct netlink_dump_control c = {
1152 .dump = nf_tables_dump_chains,
1153 };
1154 return netlink_dump_start(nlsk, skb, nlh, &c);
1155 }
1156
99633ab2 1157 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1158 if (IS_ERR(afi))
1159 return PTR_ERR(afi);
1160
f2a6d766 1161 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1162 if (IS_ERR(table))
1163 return PTR_ERR(table);
1164
664b0f8c 1165 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1166 if (IS_ERR(chain))
1167 return PTR_ERR(chain);
1168
1169 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1170 if (!skb2)
1171 return -ENOMEM;
1172
84d7fce6 1173 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1174 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1175 family, table, chain);
1176 if (err < 0)
1177 goto err;
1178
1179 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1180
1181err:
1182 kfree_skb(skb2);
1183 return err;
1184}
1185
0ca743a5
PNA		 1186static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1187 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1188 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1189};
1190
ff3cd7b3 1191static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1192{
1193 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1194 struct nft_stats __percpu *newstats;
1195 struct nft_stats *stats;
1196 int err;
1197
fceb6435
JB		 1198 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1199 NULL);
0ca743a5 1200 if (err < 0)
ff3cd7b3 1201 return ERR_PTR(err);
0ca743a5
PNA		 1202
1203 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1204 return ERR_PTR(-EINVAL);
0ca743a5 1205
ce355e20 1206 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1207 if (newstats == NULL)
ff3cd7b3 1208 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1209
1210 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1211 * are not exposed to userspace.
1212 */
e8781f70 1213 preempt_disable();
0ca743a5
PNA		 1214 stats = this_cpu_ptr(newstats);
1215 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1216 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1217 preempt_enable();
0ca743a5 1218
ff3cd7b3
PNA		 1219 return newstats;
1220}
1221
1222static void nft_chain_stats_replace(struct nft_base_chain *chain,
1223 struct nft_stats __percpu *newstats)
1224{
b88825de
PNA		 1225 if (newstats == NULL)
1226 return;
1227
0ca743a5 1228 if (chain->stats) {
0ca743a5 1229 struct nft_stats __percpu *oldstats =
67a8fc27 1230 nft_dereference(chain->stats);
0ca743a5
PNA		 1231
1232 rcu_assign_pointer(chain->stats, newstats);
1233 synchronize_rcu();
1234 free_percpu(oldstats);
1235 } else
1236 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1237}
1238
91c7b38d
PNA		 1239static void nf_tables_chain_destroy(struct nft_chain *chain)
1240{
1241 BUG_ON(chain->use > 0);
1242
f323d954 1243 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1244 struct nft_base_chain *basechain = nft_base_chain(chain);
1245
1246 module_put(basechain->type->owner);
1247 free_percpu(basechain->stats);
9f08ea84
PNA		 1248 if (basechain->stats)
1249 static_branch_dec(&nft_counters_enabled);
c974a3a3
PNA		 1250 if (basechain->ops.dev != NULL)
1251 dev_put(basechain->ops.dev);
b7263e07 1252 kfree(chain->name);
2cbce139 1253 kfree(basechain);
91c7b38d 1254 } else {
b7263e07 1255 kfree(chain->name);
91c7b38d
PNA		 1256 kfree(chain);
1257 }
1258}
1259
508f8ccd
PNA		 1260struct nft_chain_hook {
1261 u32 num;
84ba7dd7 1262 s32 priority;
508f8ccd
PNA		 1263 const struct nf_chain_type *type;
1264 struct net_device *dev;
1265};
1266
1267static int nft_chain_parse_hook(struct net *net,
1268 const struct nlattr * const nla[],
1269 struct nft_af_info *afi,
1270 struct nft_chain_hook *hook, bool create)
1271{
1272 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1273 const struct nf_chain_type *type;
1274 struct net_device *dev;
1275 int err;
1276
1277 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
fceb6435 1278 nft_hook_policy, NULL);
508f8ccd
PNA		 1279 if (err < 0)
1280 return err;
1281
1282 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1283 ha[NFTA_HOOK_PRIORITY] == NULL)
1284 return -EINVAL;
1285
1286 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1287 if (hook->num >= afi->nhooks)
1288 return -EINVAL;
1289
1290 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1291
1292 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1293 if (nla[NFTA_CHAIN_TYPE]) {
1294 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1295 create);
1296 if (IS_ERR(type))
1297 return PTR_ERR(type);
1298 }
1299 if (!(type->hook_mask & (1 << hook->num)))
1300 return -EOPNOTSUPP;
84ba7dd7
FW		 1301
1302 if (type->type == NFT_CHAIN_T_NAT &&
1303 hook->priority <= NF_IP_PRI_CONNTRACK)
1304 return -EOPNOTSUPP;
1305
508f8ccd
PNA		 1306 if (!try_module_get(type->owner))
1307 return -ENOENT;
1308
1309 hook->type = type;
1310
1311 hook->dev = NULL;
1312 if (afi->flags & NFT_AF_NEEDS_DEV) {
1313 char ifname[IFNAMSIZ];
1314
1315 if (!ha[NFTA_HOOK_DEV]) {
1316 module_put(type->owner);
1317 return -EOPNOTSUPP;
1318 }
1319
1320 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1321 dev = dev_get_by_name(net, ifname);
1322 if (!dev) {
1323 module_put(type->owner);
1324 return -ENOENT;
1325 }
1326 hook->dev = dev;
1327 } else if (ha[NFTA_HOOK_DEV]) {
1328 module_put(type->owner);
1329 return -EOPNOTSUPP;
1330 }
1331
1332 return 0;
1333}
1334
1335static void nft_chain_release_hook(struct nft_chain_hook *hook)
1336{
1337 module_put(hook->type->owner);
1338 if (hook->dev != NULL)
1339 dev_put(hook->dev);
1340}
1341
4035285f
PNA		 1342static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1343 u8 policy, bool create)
1344{
1345 const struct nlattr * const *nla = ctx->nla;
1346 struct nft_table *table = ctx->table;
1347 struct nft_af_info *afi = ctx->afi;
1348 struct nft_base_chain *basechain;
1349 struct nft_stats __percpu *stats;
1350 struct net *net = ctx->net;
1351 struct nft_chain *chain;
4035285f
PNA		 1352 int err;
1353
1354 if (table->use == UINT_MAX)
1355 return -EOVERFLOW;
1356
1357 if (nla[NFTA_CHAIN_HOOK]) {
1358 struct nft_chain_hook hook;
1359 struct nf_hook_ops *ops;
4035285f
PNA		 1360
1361 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1362 if (err < 0)
1363 return err;
1364
1365 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1366 if (basechain == NULL) {
1367 nft_chain_release_hook(&hook);
1368 return -ENOMEM;
1369 }
1370
1371 if (hook.dev != NULL)
1372 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1373
1374 if (nla[NFTA_CHAIN_COUNTERS]) {
1375 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1376 if (IS_ERR(stats)) {
1377 nft_chain_release_hook(&hook);
1378 kfree(basechain);
1379 return PTR_ERR(stats);
1380 }
1381 basechain->stats = stats;
1382 static_branch_inc(&nft_counters_enabled);
1383 }
1384
4035285f
PNA		 1385 basechain->type = hook.type;
1386 chain = &basechain->chain;
1387
c974a3a3
PNA		 1388 ops = &basechain->ops;
1389 ops->pf = family;
1390 ops->hooknum = hook.num;
1391 ops->priority = hook.priority;
1392 ops->priv = chain;
c2f9eafe 1393 ops->hook = hook.type->hooks[ops->hooknum];
c974a3a3 1394 ops->dev = hook.dev;
c974a3a3
PNA		 1395
1396 if (basechain->type->type == NFT_CHAIN_T_NAT)
1397 ops->nat_hook = true;
4035285f
PNA		 1398
1399 chain->flags |= NFT_BASE_CHAIN;
1400 basechain->policy = policy;
1401 } else {
1402 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1403 if (chain == NULL)
1404 return -ENOMEM;
1405 }
1406 INIT_LIST_HEAD(&chain->rules);
1407 chain->handle = nf_tables_alloc_handle(table);
1408 chain->table = table;
1409 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1410 if (!chain->name) {
1411 err = -ENOMEM;
1412 goto err1;
1413 }
1414
c974a3a3 1415 err = nf_tables_register_hook(net, table, chain);
4035285f
PNA		 1416 if (err < 0)
1417 goto err1;
1418
1419 ctx->chain = chain;
1420 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1421 if (err < 0)
1422 goto err2;
1423
1424 table->use++;
1425 list_add_tail_rcu(&chain->list, &table->chains);
1426
1427 return 0;
1428err2:
c974a3a3 1429 nf_tables_unregister_hook(net, table, chain);
4035285f
PNA		 1430err1:
1431 nf_tables_chain_destroy(chain);
1432
1433 return err;
1434}
1435
2c4a488a
PNA		 1436static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1437 bool create)
1438{
1439 const struct nlattr * const *nla = ctx->nla;
1440 struct nft_table *table = ctx->table;
1441 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 1442 struct nft_base_chain *basechain;
1443 struct nft_stats *stats = NULL;
1444 struct nft_chain_hook hook;
1445 const struct nlattr *name;
1446 struct nf_hook_ops *ops;
1447 struct nft_trans *trans;
c974a3a3 1448 int err;
2c4a488a
PNA		 1449
1450 if (nla[NFTA_CHAIN_HOOK]) {
1451 if (!nft_is_base_chain(chain))
1452 return -EBUSY;
1453
1454 err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,
1455 create);
1456 if (err < 0)
1457 return err;
1458
1459 basechain = nft_base_chain(chain);
1460 if (basechain->type != hook.type) {
1461 nft_chain_release_hook(&hook);
1462 return -EBUSY;
1463 }
1464
c974a3a3
PNA		 1465 ops = &basechain->ops;
1466 if (ops->hooknum != hook.num ||
1467 ops->priority != hook.priority ||
1468 ops->dev != hook.dev) {
1469 nft_chain_release_hook(&hook);
1470 return -EBUSY;
2c4a488a
PNA		 1471 }
1472 nft_chain_release_hook(&hook);
1473 }
1474
1475 if (nla[NFTA_CHAIN_HANDLE] &&
1476 nla[NFTA_CHAIN_NAME]) {
1477 struct nft_chain *chain2;
1478
1479 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1480 genmask);
0d18779b
JC		 1481 if (!IS_ERR(chain2))
1482 return -EEXIST;
2c4a488a
PNA		 1483 }
1484
1485 if (nla[NFTA_CHAIN_COUNTERS]) {
1486 if (!nft_is_base_chain(chain))
1487 return -EOPNOTSUPP;
1488
1489 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1490 if (IS_ERR(stats))
1491 return PTR_ERR(stats);
1492 }
1493
1494 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1495 sizeof(struct nft_trans_chain));
1496 if (trans == NULL) {
1497 free_percpu(stats);
1498 return -ENOMEM;
1499 }
1500
1501 nft_trans_chain_stats(trans) = stats;
1502 nft_trans_chain_update(trans) = true;
1503
1504 if (nla[NFTA_CHAIN_POLICY])
1505 nft_trans_chain_policy(trans) = policy;
1506 else
1507 nft_trans_chain_policy(trans) = -1;
1508
1509 name = nla[NFTA_CHAIN_NAME];
1510 if (nla[NFTA_CHAIN_HANDLE] && name) {
1511 nft_trans_chain_name(trans) =
1512 nla_strdup(name, GFP_KERNEL);
1513 if (!nft_trans_chain_name(trans)) {
1514 kfree(trans);
1515 free_percpu(stats);
1516 return -ENOMEM;
1517 }
1518 }
1519 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1520
1521 return 0;
1522}
1523
633c9a84
PNA		 1524static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1525 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1526 const struct nlattr * const nla[],
1527 struct netlink_ext_ack *extack)
96518518
PM		 1528{
1529 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1530 const struct nlattr * uninitialized_var(name);
4035285f
PNA		 1531 u8 genmask = nft_genmask_next(net);
1532 int family = nfmsg->nfgen_family;
7c95f6d8 1533 struct nft_af_info *afi;
96518518
PM		 1534 struct nft_table *table;
1535 struct nft_chain *chain;
57de2a0c 1536 u8 policy = NF_ACCEPT;
4035285f 1537 struct nft_ctx ctx;
96518518 1538 u64 handle = 0;
96518518
PM		 1539 bool create;
1540
1541 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1542
99633ab2 1543 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1544 if (IS_ERR(afi))
1545 return PTR_ERR(afi);
1546
f2a6d766 1547 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1548 if (IS_ERR(table))
1549 return PTR_ERR(table);
1550
96518518
PM		 1551 chain = NULL;
1552 name = nla[NFTA_CHAIN_NAME];
1553
1554 if (nla[NFTA_CHAIN_HANDLE]) {
1555 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1556 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1557 if (IS_ERR(chain))
1558 return PTR_ERR(chain);
1559 } else {
664b0f8c 1560 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1561 if (IS_ERR(chain)) {
1562 if (PTR_ERR(chain) != -ENOENT)
1563 return PTR_ERR(chain);
1564 chain = NULL;
1565 }
1566 }
1567
57de2a0c 1568 if (nla[NFTA_CHAIN_POLICY]) {
f323d954
PNA		 1569 if (chain != NULL &&
1570 !nft_is_base_chain(chain))
d6b6cb1d
PNA		 1571 return -EOPNOTSUPP;
1572
1573 if (chain == NULL &&
57de2a0c
PM		 1574 nla[NFTA_CHAIN_HOOK] == NULL)
1575 return -EOPNOTSUPP;
1576
8f46df18 1577 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1578 switch (policy) {
1579 case NF_DROP:
1580 case NF_ACCEPT:
1581 break;
1582 default:
1583 return -EINVAL;
1584 }
1585 }
1586
4035285f
PNA		 1587 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1588
96518518
PM		 1589 if (chain != NULL) {
1590 if (nlh->nlmsg_flags & NLM_F_EXCL)
1591 return -EEXIST;
1592 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1593 return -EOPNOTSUPP;
1594
2c4a488a 1595 return nf_tables_updchain(&ctx, genmask, policy, create);
96518518
PM		 1596 }
1597
4035285f 1598 return nf_tables_addchain(&ctx, family, genmask, policy, create);
96518518
PM		 1599}
1600
633c9a84
PNA		 1601static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1602 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1603 const struct nlattr * const nla[],
1604 struct netlink_ext_ack *extack)
96518518
PM		 1605{
1606 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1607 u8 genmask = nft_genmask_next(net);
7c95f6d8 1608 struct nft_af_info *afi;
96518518
PM		 1609 struct nft_table *table;
1610 struct nft_chain *chain;
9dee1474 1611 struct nft_rule *rule;
96518518 1612 int family = nfmsg->nfgen_family;
91c7b38d 1613 struct nft_ctx ctx;
9dee1474
PNA		 1614 u32 use;
1615 int err;
96518518 1616
99633ab2 1617 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1618 if (IS_ERR(afi))
1619 return PTR_ERR(afi);
1620
f2a6d766 1621 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1622 if (IS_ERR(table))
1623 return PTR_ERR(table);
1624
664b0f8c 1625 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1626 if (IS_ERR(chain))
1627 return PTR_ERR(chain);
9dee1474
PNA		 1628
1629 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1630 chain->use > 0)
96518518
PM		 1631 return -EBUSY;
1632
633c9a84 1633 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1634
9dee1474
PNA		 1635 use = chain->use;
1636 list_for_each_entry(rule, &chain->rules, list) {
1637 if (!nft_is_active_next(net, rule))
1638 continue;
1639 use--;
1640
1641 err = nft_delrule(&ctx, rule);
1642 if (err < 0)
1643 return err;
1644 }
1645
1646 /* There are rules and elements that are still holding references to us,
1647 * we cannot do a recursive removal in this case.
1648 */
1649 if (use > 0)
1650 return -EBUSY;
1651
ee01d542 1652 return nft_delchain(&ctx);
96518518
PM		 1653}
1654
96518518
PM		 1655/*
1656 * Expressions
1657 */
1658
1659/**
ef1f7df9
PM		 1660 * nft_register_expr - register nf_tables expr type
1661 * @ops: expr type
96518518 1662 *
ef1f7df9 1663 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1664 * success or a negative errno code otherwise.
1665 */
ef1f7df9 1666int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1667{
1668 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1669 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1670 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1671 else
e688a7f8 1672 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1673 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1674 return 0;
1675}
1676EXPORT_SYMBOL_GPL(nft_register_expr);
1677
1678/**
ef1f7df9
PM		 1679 * nft_unregister_expr - unregister nf_tables expr type
1680 * @ops: expr type
96518518 1681 *
ef1f7df9 1682 * Unregisters the expr typefor use with nf_tables.
96518518 1683 */
ef1f7df9 1684void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1685{
1686 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1687 list_del_rcu(&type->list);
96518518
PM		 1688 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1689}
1690EXPORT_SYMBOL_GPL(nft_unregister_expr);
1691
64d46806
PM		 1692static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1693 struct nlattr *nla)
96518518 1694{
ef1f7df9 1695 const struct nft_expr_type *type;
96518518 1696
ef1f7df9 1697 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1698 if (!nla_strcmp(nla, type->name) &&
1699 (!type->family || type->family == family))
ef1f7df9 1700 return type;
96518518
PM		 1701 }
1702 return NULL;
1703}
1704
64d46806
PM		 1705static const struct nft_expr_type *nft_expr_type_get(u8 family,
1706 struct nlattr *nla)
96518518 1707{
ef1f7df9 1708 const struct nft_expr_type *type;
96518518
PM		 1709
1710 if (nla == NULL)
1711 return ERR_PTR(-EINVAL);
1712
64d46806 1713 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1714 if (type != NULL && try_module_get(type->owner))
1715 return type;
96518518
PM		 1716
1717#ifdef CONFIG_MODULES
ef1f7df9 1718 if (type == NULL) {
64d46806
PM		 1719 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1720 request_module("nft-expr-%u-%.*s", family,
1721 nla_len(nla), (char *)nla_data(nla));
1722 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1723 if (__nft_expr_type_get(family, nla))
1724 return ERR_PTR(-EAGAIN);
1725
96518518
PM		 1726 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1727 request_module("nft-expr-%.*s",
1728 nla_len(nla), (char *)nla_data(nla));
1729 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1730 if (__nft_expr_type_get(family, nla))
96518518
PM		 1731 return ERR_PTR(-EAGAIN);
1732 }
1733#endif
1734 return ERR_PTR(-ENOENT);
1735}
1736
1737static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1738 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1739 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1740};
1741
1742static int nf_tables_fill_expr_info(struct sk_buff *skb,
1743 const struct nft_expr *expr)
1744{
ef1f7df9 1745 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1746 goto nla_put_failure;
1747
1748 if (expr->ops->dump) {
1749 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1750 if (data == NULL)
1751 goto nla_put_failure;
1752 if (expr->ops->dump(skb, expr) < 0)
1753 goto nla_put_failure;
1754 nla_nest_end(skb, data);
1755 }
1756
1757 return skb->len;
1758
1759nla_put_failure:
1760 return -1;
1761};
1762
0b2d8a7b
PM		 1763int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1764 const struct nft_expr *expr)
1765{
1766 struct nlattr *nest;
1767
1768 nest = nla_nest_start(skb, attr);
1769 if (!nest)
1770 goto nla_put_failure;
1771 if (nf_tables_fill_expr_info(skb, expr) < 0)
1772 goto nla_put_failure;
1773 nla_nest_end(skb, nest);
1774 return 0;
1775
1776nla_put_failure:
1777 return -1;
1778}
1779
96518518
PM		 1780struct nft_expr_info {
1781 const struct nft_expr_ops *ops;
ef1f7df9 1782 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1783};
1784
0ca743a5
PNA		 1785static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1786 const struct nlattr *nla,
96518518
PM		 1787 struct nft_expr_info *info)
1788{
ef1f7df9 1789 const struct nft_expr_type *type;
96518518 1790 const struct nft_expr_ops *ops;
ef1f7df9 1791 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1792 int err;
1793
fceb6435 1794 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
96518518
PM		 1795 if (err < 0)
1796 return err;
1797
64d46806 1798 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1799 if (IS_ERR(type))
1800 return PTR_ERR(type);
1801
1802 if (tb[NFTA_EXPR_DATA]) {
1803 err = nla_parse_nested(info->tb, type->maxattr,
fceb6435 1804 tb[NFTA_EXPR_DATA], type->policy, NULL);
ef1f7df9
PM		 1805 if (err < 0)
1806 goto err1;
1807 } else
1808 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1809
1810 if (type->select_ops != NULL) {
0ca743a5
PNA		 1811 ops = type->select_ops(ctx,
1812 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1813 if (IS_ERR(ops)) {
1814 err = PTR_ERR(ops);
1815 goto err1;
1816 }
1817 } else
1818 ops = type->ops;
1819
96518518
PM		 1820 info->ops = ops;
1821 return 0;
ef1f7df9
PM		 1822
1823err1:
1824 module_put(type->owner);
1825 return err;
96518518
PM		 1826}
1827
1828static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1829 const struct nft_expr_info *info,
96518518
PM		 1830 struct nft_expr *expr)
1831{
1832 const struct nft_expr_ops *ops = info->ops;
1833 int err;
1834
1835 expr->ops = ops;
1836 if (ops->init) {
ef1f7df9 1837 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1838 if (err < 0)
1839 goto err1;
1840 }
1841
c56e3956
LZ		 1842 if (ops->validate) {
1843 const struct nft_data *data = NULL;
1844
1845 err = ops->validate(ctx, expr, &data);
1846 if (err < 0)
1847 goto err2;
1848 }
1849
96518518
PM		 1850 return 0;
1851
c56e3956
LZ		 1852err2:
1853 if (ops->destroy)
1854 ops->destroy(ctx, expr);
96518518
PM		 1855err1:
1856 expr->ops = NULL;
1857 return err;
1858}
1859
62472bce
PM		 1860static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1861 struct nft_expr *expr)
96518518
PM		 1862{
1863 if (expr->ops->destroy)
62472bce 1864 expr->ops->destroy(ctx, expr);
ef1f7df9 1865 module_put(expr->ops->type->owner);
96518518
PM		 1866}
1867
0b2d8a7b
PM		 1868struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1869 const struct nlattr *nla)
1870{
1871 struct nft_expr_info info;
1872 struct nft_expr *expr;
1873 int err;
1874
1875 err = nf_tables_expr_parse(ctx, nla, &info);
1876 if (err < 0)
1877 goto err1;
1878
1879 err = -ENOMEM;
1880 expr = kzalloc(info.ops->size, GFP_KERNEL);
1881 if (expr == NULL)
1882 goto err2;
1883
1884 err = nf_tables_newexpr(ctx, &info, expr);
1885 if (err < 0)
6cafaf47 1886 goto err3;
0b2d8a7b
PM		 1887
1888 return expr;
6cafaf47
LZ		 1889err3:
1890 kfree(expr);
0b2d8a7b
PM		 1891err2:
1892 module_put(info.ops->type->owner);
1893err1:
1894 return ERR_PTR(err);
1895}
1896
1897void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1898{
1899 nf_tables_expr_destroy(ctx, expr);
1900 kfree(expr);
1901}
1902
96518518
PM		 1903/*
1904 * Rules
1905 */
1906
1907static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1908 u64 handle)
1909{
1910 struct nft_rule *rule;
1911
1912 // FIXME: this sucks
1913 list_for_each_entry(rule, &chain->rules, list) {
1914 if (handle == rule->handle)
1915 return rule;
1916 }
1917
1918 return ERR_PTR(-ENOENT);
1919}
1920
1921static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1922 const struct nlattr *nla)
1923{
1924 if (nla == NULL)
1925 return ERR_PTR(-EINVAL);
1926
1927 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1928}
1929
1930static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 1931 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1932 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1933 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1934 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1935 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1936 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1937 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1938 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1939 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1940 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1941};
1942
84d7fce6
PNA		 1943static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1944 u32 portid, u32 seq, int event,
1945 u32 flags, int family,
96518518
PM		 1946 const struct nft_table *table,
1947 const struct nft_chain *chain,
1948 const struct nft_rule *rule)
1949{
1950 struct nlmsghdr *nlh;
1951 struct nfgenmsg *nfmsg;
1952 const struct nft_expr *expr, *next;
1953 struct nlattr *list;
5e948466 1954 const struct nft_rule *prule;
dedb67c4 1955 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 1956
dedb67c4 1957 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 1958 if (nlh == NULL)
1959 goto nla_put_failure;
1960
1961 nfmsg = nlmsg_data(nlh);
1962 nfmsg->nfgen_family = family;
1963 nfmsg->version = NFNETLINK_V0;
84d7fce6 1964 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1965
1966 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1967 goto nla_put_failure;
1968 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1969 goto nla_put_failure;
b46f6ded
ND		 1970 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1971 NFTA_RULE_PAD))
96518518
PM		 1972 goto nla_put_failure;
1973
5e948466 1974 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 1975 prule = list_prev_entry(rule, list);
5e948466 1976 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1977 cpu_to_be64(prule->handle),
1978 NFTA_RULE_PAD))
5e948466
EL		 1979 goto nla_put_failure;
1980 }
1981
96518518
PM		 1982 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1983 if (list == NULL)
1984 goto nla_put_failure;
1985 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1986 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1987 goto nla_put_failure;
96518518
PM		 1988 }
1989 nla_nest_end(skb, list);
1990
86f1ec32
PM		 1991 if (rule->udata) {
1992 struct nft_userdata *udata = nft_userdata(rule);
1993 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1994 udata->data) < 0)
1995 goto nla_put_failure;
1996 }
0768b3b3 1997
053c095a
JB		 1998 nlmsg_end(skb, nlh);
1999 return 0;
96518518
PM		 2000
2001nla_put_failure:
2002 nlmsg_trim(skb, nlh);
2003 return -1;
2004}
2005
25e94a99
PNA		 2006static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2007 const struct nft_rule *rule, int event)
96518518
PM		 2008{
2009 struct sk_buff *skb;
96518518
PM		 2010 int err;
2011
128ad332
PNA		 2012 if (!ctx->report &&
2013 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2014 return;
96518518 2015
96518518
PM		 2016 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2017 if (skb == NULL)
2018 goto err;
2019
84d7fce6
PNA		 2020 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2021 event, 0, ctx->afi->family, ctx->table,
35151d84 2022 ctx->chain, rule);
96518518
PM		 2023 if (err < 0) {
2024 kfree_skb(skb);
2025 goto err;
2026 }
2027
25e94a99
PNA		 2028 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2029 ctx->report, GFP_KERNEL);
2030 return;
96518518 2031err:
25e94a99 2032 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2033}
2034
6e1f760e 2035struct nft_rule_dump_ctx {
e46abbcc 2036 char *table;
b7263e07 2037 char *chain;
6e1f760e
PNA		 2038};
2039
96518518
PM		 2040static int nf_tables_dump_rules(struct sk_buff *skb,
2041 struct netlink_callback *cb)
2042{
2043 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2044 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 2045 const struct nft_af_info *afi;
2046 const struct nft_table *table;
2047 const struct nft_chain *chain;
2048 const struct nft_rule *rule;
2049 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 2050 struct net *net = sock_net(skb->sk);
96518518
PM		 2051 int family = nfmsg->nfgen_family;
2052
e688a7f8 2053 rcu_read_lock();
38e029f1
PNA		 2054 cb->seq = net->nft.base_seq;
2055
e688a7f8 2056 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 2057 if (family != NFPROTO_UNSPEC && family != afi->family)
2058 continue;
2059
e688a7f8 2060 list_for_each_entry_rcu(table, &afi->tables, list) {
e46abbcc 2061 if (ctx && ctx->table &&
6e1f760e
PNA		 2062 strcmp(ctx->table, table->name) != 0)
2063 continue;
2064
e688a7f8 2065 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 2066 if (ctx && ctx->chain[0] &&
2067 strcmp(ctx->chain, chain->name) != 0)
2068 continue;
2069
e688a7f8 2070 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2071 if (!nft_is_active(net, rule))
0628b123 2072 goto cont;
96518518
PM		 2073 if (idx < s_idx)
2074 goto cont;
2075 if (idx > s_idx)
2076 memset(&cb->args[1], 0,
2077 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2078 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2079 cb->nlh->nlmsg_seq,
2080 NFT_MSG_NEWRULE,
2081 NLM_F_MULTI | NLM_F_APPEND,
2082 afi->family, table, chain, rule) < 0)
2083 goto done;
38e029f1
PNA		 2084
2085 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2086cont:
2087 idx++;
2088 }
2089 }
2090 }
2091 }
2092done:
e688a7f8
PNA		 2093 rcu_read_unlock();
2094
96518518
PM		 2095 cb->args[0] = idx;
2096 return skb->len;
2097}
2098
6e1f760e
PNA		 2099static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2100{
e46abbcc
PS		 2101 struct nft_rule_dump_ctx *ctx = cb->data;
2102
2103 if (ctx) {
2104 kfree(ctx->table);
b7263e07 2105 kfree(ctx->chain);
e46abbcc
PS		 2106 kfree(ctx);
2107 }
6e1f760e
PNA		 2108 return 0;
2109}
2110
7b8002a1
PNA		 2111static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2112 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2113 const struct nlattr * const nla[],
2114 struct netlink_ext_ack *extack)
96518518
PM		 2115{
2116 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2117 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2118 const struct nft_af_info *afi;
2119 const struct nft_table *table;
2120 const struct nft_chain *chain;
2121 const struct nft_rule *rule;
2122 struct sk_buff *skb2;
2123 int family = nfmsg->nfgen_family;
2124 int err;
2125
2126 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2127 struct netlink_dump_control c = {
2128 .dump = nf_tables_dump_rules,
6e1f760e 2129 .done = nf_tables_dump_rules_done,
96518518 2130 };
6e1f760e
PNA		 2131
2132 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2133 struct nft_rule_dump_ctx *ctx;
2134
2135 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2136 if (!ctx)
2137 return -ENOMEM;
2138
e46abbcc
PS		 2139 if (nla[NFTA_RULE_TABLE]) {
2140 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2141 GFP_KERNEL);
2142 if (!ctx->table) {
2143 kfree(ctx);
2144 return -ENOMEM;
2145 }
2146 }
b7263e07
PS		 2147 if (nla[NFTA_RULE_CHAIN]) {
2148 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2149 GFP_KERNEL);
2150 if (!ctx->chain) {
2151 kfree(ctx->table);
2152 kfree(ctx);
2153 return -ENOMEM;
2154 }
2155 }
6e1f760e
PNA		 2156 c.data = ctx;
2157 }
2158
96518518
PM		 2159 return netlink_dump_start(nlsk, skb, nlh, &c);
2160 }
2161
99633ab2 2162 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2163 if (IS_ERR(afi))
2164 return PTR_ERR(afi);
2165
f2a6d766 2166 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2167 if (IS_ERR(table))
2168 return PTR_ERR(table);
2169
664b0f8c 2170 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2171 if (IS_ERR(chain))
2172 return PTR_ERR(chain);
2173
2174 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2175 if (IS_ERR(rule))
2176 return PTR_ERR(rule);
2177
2178 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2179 if (!skb2)
2180 return -ENOMEM;
2181
84d7fce6 2182 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2183 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2184 family, table, chain, rule);
2185 if (err < 0)
2186 goto err;
2187
2188 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2189
2190err:
2191 kfree_skb(skb2);
2192 return err;
2193}
2194
62472bce
PM		 2195static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2196 struct nft_rule *rule)
96518518 2197{
96518518
PM		 2198 struct nft_expr *expr;
2199
2200 /*
2201 * Careful: some expressions might not be initialized in case this
2202 * is called on error from nf_tables_newrule().
2203 */
2204 expr = nft_expr_first(rule);
3e38df13 2205 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2206 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2207 expr = nft_expr_next(expr);
2208 }
2209 kfree(rule);
2210}
2211
1081d11b
PNA		 2212#define NFT_RULE_MAXEXPRS 128
2213
2214static struct nft_expr_info *info;
2215
633c9a84
PNA		 2216static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2217 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2218 const struct nlattr * const nla[],
2219 struct netlink_ext_ack *extack)
96518518
PM		 2220{
2221 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2222 u8 genmask = nft_genmask_next(net);
7c95f6d8 2223 struct nft_af_info *afi;
96518518
PM		 2224 struct nft_table *table;
2225 struct nft_chain *chain;
2226 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2227 struct nft_userdata *udata;
1081d11b 2228 struct nft_trans *trans = NULL;
96518518
PM		 2229 struct nft_expr *expr;
2230 struct nft_ctx ctx;
2231 struct nlattr *tmp;
86f1ec32 2232 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2233 int err, rem;
2234 bool create;
5e948466 2235 u64 handle, pos_handle;
96518518
PM		 2236
2237 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2238
99633ab2 2239 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2240 if (IS_ERR(afi))
2241 return PTR_ERR(afi);
2242
f2a6d766 2243 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2244 if (IS_ERR(table))
2245 return PTR_ERR(table);
2246
664b0f8c 2247 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2248 if (IS_ERR(chain))
2249 return PTR_ERR(chain);
2250
2251 if (nla[NFTA_RULE_HANDLE]) {
2252 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2253 rule = __nf_tables_rule_lookup(chain, handle);
2254 if (IS_ERR(rule))
2255 return PTR_ERR(rule);
2256
2257 if (nlh->nlmsg_flags & NLM_F_EXCL)
2258 return -EEXIST;
2259 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2260 old_rule = rule;
2261 else
2262 return -EOPNOTSUPP;
2263 } else {
2264 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2265 return -EINVAL;
2266 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2267
2268 if (chain->use == UINT_MAX)
2269 return -EOVERFLOW;
96518518
PM		 2270 }
2271
5e948466
EL		 2272 if (nla[NFTA_RULE_POSITION]) {
2273 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2274 return -EOPNOTSUPP;
2275
2276 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2277 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2278 if (IS_ERR(old_rule))
2279 return PTR_ERR(old_rule);
2280 }
2281
633c9a84 2282 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2283
96518518
PM		 2284 n = 0;
2285 size = 0;
2286 if (nla[NFTA_RULE_EXPRESSIONS]) {
2287 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2288 err = -EINVAL;
2289 if (nla_type(tmp) != NFTA_LIST_ELEM)
2290 goto err1;
2291 if (n == NFT_RULE_MAXEXPRS)
2292 goto err1;
0ca743a5 2293 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2294 if (err < 0)
2295 goto err1;
2296 size += info[n].ops->size;
2297 n++;
2298 }
2299 }
9889840f
PM		 2300 /* Check for overflow of dlen field */
2301 err = -EFBIG;
2302 if (size >= 1 << 12)
2303 goto err1;
96518518 2304
86f1ec32 2305 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2306 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2307 if (ulen > 0)
2308 usize = sizeof(struct nft_userdata) + ulen;
2309 }
0768b3b3 2310
96518518 2311 err = -ENOMEM;
86f1ec32 2312 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2313 if (rule == NULL)
2314 goto err1;
2315
889f7ee7 2316 nft_activate_next(net, rule);
0628b123 2317
96518518
PM		 2318 rule->handle = handle;
2319 rule->dlen = size;
86f1ec32 2320 rule->udata = ulen ? 1 : 0;
0768b3b3 2321
86f1ec32
PM		 2322 if (ulen) {
2323 udata = nft_userdata(rule);
2324 udata->len = ulen - 1;
2325 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2326 }
96518518 2327
96518518
PM		 2328 expr = nft_expr_first(rule);
2329 for (i = 0; i < n; i++) {
2330 err = nf_tables_newexpr(&ctx, &info[i], expr);
2331 if (err < 0)
2332 goto err2;
ef1f7df9 2333 info[i].ops = NULL;
96518518
PM		 2334 expr = nft_expr_next(expr);
2335 }
2336
96518518 2337 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2338 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2339 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2340 old_rule);
1081d11b 2341 if (trans == NULL) {
0628b123
PNA		 2342 err = -ENOMEM;
2343 goto err2;
2344 }
889f7ee7 2345 nft_deactivate_next(net, old_rule);
ac34b861 2346 chain->use--;
5bc5c307 2347 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2348 } else {
2349 err = -ENOENT;
2350 goto err2;
2351 }
96518518 2352 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2353 if (old_rule)
2354 list_add_rcu(&rule->list, &old_rule->list);
2355 else
2356 list_add_tail_rcu(&rule->list, &chain->rules);
2357 else {
2358 if (old_rule)
2359 list_add_tail_rcu(&rule->list, &old_rule->list);
2360 else
2361 list_add_rcu(&rule->list, &chain->rules);
2362 }
96518518 2363
b380e5c7 2364 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2365 err = -ENOMEM;
2366 goto err3;
2367 }
4fefee57 2368 chain->use++;
96518518
PM		 2369 return 0;
2370
0628b123
PNA		 2371err3:
2372 list_del_rcu(&rule->list);
96518518 2373err2:
62472bce 2374 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2375err1:
2376 for (i = 0; i < n; i++) {
2377 if (info[i].ops != NULL)
ef1f7df9 2378 module_put(info[i].ops->type->owner);
96518518
PM		 2379 }
2380 return err;
2381}
2382
1a94e38d
PNA		 2383static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2384 const struct nlattr *nla)
2385{
2386 u32 id = ntohl(nla_get_be32(nla));
2387 struct nft_trans *trans;
2388
2389 list_for_each_entry(trans, &net->nft.commit_list, list) {
2390 struct nft_rule *rule = nft_trans_rule(trans);
2391
2392 if (trans->msg_type == NFT_MSG_NEWRULE &&
2393 id == nft_trans_rule_id(trans))
2394 return rule;
2395 }
2396 return ERR_PTR(-ENOENT);
2397}
2398
633c9a84
PNA		 2399static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2400 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2401 const struct nlattr * const nla[],
2402 struct netlink_ext_ack *extack)
96518518
PM		 2403{
2404 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2405 u8 genmask = nft_genmask_next(net);
7c95f6d8 2406 struct nft_af_info *afi;
7c95f6d8 2407 struct nft_table *table;
cf9dc09d
PNA		 2408 struct nft_chain *chain = NULL;
2409 struct nft_rule *rule;
0628b123
PNA		 2410 int family = nfmsg->nfgen_family, err = 0;
2411 struct nft_ctx ctx;
96518518 2412
99633ab2 2413 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2414 if (IS_ERR(afi))
2415 return PTR_ERR(afi);
2416
f2a6d766 2417 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2418 if (IS_ERR(table))
2419 return PTR_ERR(table);
2420
cf9dc09d 2421 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2422 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2423 genmask);
cf9dc09d
PNA		 2424 if (IS_ERR(chain))
2425 return PTR_ERR(chain);
2426 }
96518518 2427
633c9a84 2428 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2429
cf9dc09d
PNA		 2430 if (chain) {
2431 if (nla[NFTA_RULE_HANDLE]) {
2432 rule = nf_tables_rule_lookup(chain,
2433 nla[NFTA_RULE_HANDLE]);
2434 if (IS_ERR(rule))
2435 return PTR_ERR(rule);
96518518 2436
1a94e38d
PNA		 2437 err = nft_delrule(&ctx, rule);
2438 } else if (nla[NFTA_RULE_ID]) {
2439 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2440 if (IS_ERR(rule))
2441 return PTR_ERR(rule);
2442
5e266fe7 2443 err = nft_delrule(&ctx, rule);
cf9dc09d 2444 } else {
ce24b721 2445 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2446 }
2447 } else {
2448 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2449 if (!nft_is_active_next(net, chain))
2450 continue;
2451
cf9dc09d 2452 ctx.chain = chain;
ce24b721 2453 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2454 if (err < 0)
2455 break;
2456 }
2457 }
2458
2459 return err;
2460}
2461
20a69341
PM		 2462/*
2463 * Sets
2464 */
2465
2b664957 2466static LIST_HEAD(nf_tables_set_types);
20a69341 2467
2b664957 2468int nft_register_set(struct nft_set_type *type)
20a69341
PM		 2469{
2470 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2471 list_add_tail_rcu(&type->list, &nf_tables_set_types);
20a69341
PM		 2472 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2473 return 0;
2474}
2475EXPORT_SYMBOL_GPL(nft_register_set);
2476
2b664957 2477void nft_unregister_set(struct nft_set_type *type)
20a69341
PM		 2478{
2479 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2480 list_del_rcu(&type->list);
20a69341
PM		 2481 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2482}
2483EXPORT_SYMBOL_GPL(nft_unregister_set);
2484
2b664957
PNA		 2485#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2486 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2487
2488static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2489{
2490 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2491}
2492
c50b960c
PM		 2493/*
2494 * Select a set implementation based on the data characteristics and the
2495 * given policy. The total memory use might not be known if no size is
2496 * given, in that case the amount of memory per element is used.
2497 */
2498static const struct nft_set_ops *
2b664957
PNA		 2499nft_select_set_ops(const struct nft_ctx *ctx,
2500 const struct nlattr * const nla[],
c50b960c
PM		 2501 const struct nft_set_desc *desc,
2502 enum nft_set_policies policy)
20a69341 2503{
c50b960c
PM		 2504 const struct nft_set_ops *ops, *bops;
2505 struct nft_set_estimate est, best;
2b664957
PNA		 2506 const struct nft_set_type *type;
2507 u32 flags = 0;
20a69341
PM		 2508
2509#ifdef CONFIG_MODULES
2b664957 2510 if (list_empty(&nf_tables_set_types)) {
20a69341
PM		 2511 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2512 request_module("nft-set");
2513 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2514 if (!list_empty(&nf_tables_set_types))
20a69341
PM		 2515 return ERR_PTR(-EAGAIN);
2516 }
2517#endif
2b664957
PNA		 2518 if (nla[NFTA_SET_FLAGS] != NULL)
2519 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 2520
55af753c
PNA		 2521 bops = NULL;
2522 best.size = ~0;
2523 best.lookup = ~0;
0b5a7874 2524 best.space = ~0;
c50b960c 2525
2b664957
PNA		 2526 list_for_each_entry(type, &nf_tables_set_types, list) {
2527 if (!type->select_ops)
2528 ops = type->ops;
2529 else
2530 ops = type->select_ops(ctx, desc, flags);
2531 if (!ops)
2532 continue;
2533
2534 if (!nft_set_ops_candidate(ops, flags))
20a69341 2535 continue;
2b664957 2536 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 2537 continue;
2538
2539 switch (policy) {
2540 case NFT_SET_POL_PERFORMANCE:
55af753c 2541 if (est.lookup < best.lookup)
c50b960c 2542 break;
644e334e
PNA		 2543 if (est.lookup == best.lookup &&
2544 est.space < best.space)
2545 break;
c50b960c
PM		 2546 continue;
2547 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2548 if (!desc->size) {
2549 if (est.space < best.space)
2550 break;
2551 if (est.space == best.space &&
2552 est.lookup < best.lookup)
2553 break;
2554 } else if (est.size < best.size) {
c50b960c 2555 break;
0b5a7874 2556 }
c50b960c
PM		 2557 continue;
2558 default:
2559 break;
2560 }
2561
2b664957 2562 if (!try_module_get(type->owner))
20a69341 2563 continue;
c50b960c 2564 if (bops != NULL)
2b664957 2565 module_put(bops->type->owner);
c50b960c
PM		 2566
2567 bops = ops;
2568 best = est;
20a69341
PM		 2569 }
2570
c50b960c
PM		 2571 if (bops != NULL)
2572 return bops;
2573
20a69341
PM		 2574 return ERR_PTR(-EOPNOTSUPP);
2575}
2576
2577static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2578 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2579 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2580 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2581 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2582 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2583 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2584 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2585 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2586 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2587 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2588 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2589 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2590 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2591 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2592 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2593 .len = NFT_USERDATA_MAXLEN },
8aeff920 2594 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2595};
2596
2597static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2598 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2599};
2600
633c9a84 2601static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2602 const struct sk_buff *skb,
2603 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2604 const struct nlattr * const nla[],
2605 u8 genmask)
20a69341
PM		 2606{
2607 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2608 struct nft_af_info *afi = NULL;
2609 struct nft_table *table = NULL;
20a69341 2610
c9c8e485
PNA		 2611 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2612 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2613 if (IS_ERR(afi))
2614 return PTR_ERR(afi);
2615 }
20a69341
PM		 2616
2617 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2618 if (afi == NULL)
2619 return -EAFNOSUPPORT;
2620
f2a6d766
PNA		 2621 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2622 genmask);
20a69341
PM		 2623 if (IS_ERR(table))
2624 return PTR_ERR(table);
2625 }
2626
633c9a84 2627 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2628 return 0;
2629}
2630
c7a72e3f
PNA		 2631static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2632 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2633{
2634 struct nft_set *set;
2635
2636 if (nla == NULL)
2637 return ERR_PTR(-EINVAL);
2638
2639 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2640 if (!nla_strcmp(nla, set->name) &&
2641 nft_active_genmask(set, genmask))
20a69341
PM		 2642 return set;
2643 }
2644 return ERR_PTR(-ENOENT);
2645}
2646
c7a72e3f
PNA		 2647static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2648 const struct nlattr *nla,
2649 u8 genmask)
958bee14
PNA		 2650{
2651 struct nft_trans *trans;
2652 u32 id = ntohl(nla_get_be32(nla));
2653
2654 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2655 struct nft_set *set = nft_trans_set(trans);
2656
958bee14 2657 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2658 id == nft_trans_set_id(trans) &&
2659 nft_active_genmask(set, genmask))
2660 return set;
958bee14
PNA		 2661 }
2662 return ERR_PTR(-ENOENT);
2663}
c7a72e3f
PNA		 2664
2665struct nft_set *nft_set_lookup(const struct net *net,
2666 const struct nft_table *table,
2667 const struct nlattr *nla_set_name,
2668 const struct nlattr *nla_set_id,
2669 u8 genmask)
2670{
2671 struct nft_set *set;
2672
2673 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2674 if (IS_ERR(set)) {
2675 if (!nla_set_id)
2676 return set;
2677
2678 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2679 }
2680 return set;
2681}
2682EXPORT_SYMBOL_GPL(nft_set_lookup);
958bee14 2683
20a69341
PM		 2684static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2685 const char *name)
2686{
2687 const struct nft_set *i;
2688 const char *p;
2689 unsigned long *inuse;
60eb1894 2690 unsigned int n = 0, min = 0;
20a69341 2691
38745490 2692 p = strchr(name, '%');
20a69341
PM		 2693 if (p != NULL) {
2694 if (p[1] != 'd' || strchr(p + 2, '%'))
2695 return -EINVAL;
2696
2697 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2698 if (inuse == NULL)
2699 return -ENOMEM;
60eb1894 2700cont:
20a69341 2701 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2702 int tmp;
2703
37a9cc52
PNA		 2704 if (!nft_is_active_next(ctx->net, set))
2705 continue;
14662917 2706 if (!sscanf(i->name, name, &tmp))
20a69341 2707 continue;
60eb1894 2708 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2709 continue;
14662917 2710
60eb1894 2711 set_bit(tmp - min, inuse);
20a69341
PM		 2712 }
2713
53b70287 2714 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2715 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2716 min += BITS_PER_BYTE * PAGE_SIZE;
2717 memset(inuse, 0, PAGE_SIZE);
2718 goto cont;
2719 }
20a69341
PM		 2720 free_page((unsigned long)inuse);
2721 }
2722
38745490
PS		 2723 set->name = kasprintf(GFP_KERNEL, name, min + n);
2724 if (!set->name)
2725 return -ENOMEM;
2726
20a69341 2727 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2728 if (!nft_is_active_next(ctx->net, i))
2729 continue;
e63aaaa6
AY		 2730 if (!strcmp(set->name, i->name)) {
2731 kfree(set->name);
20a69341 2732 return -ENFILE;
e63aaaa6 2733 }
20a69341
PM		 2734 }
2735 return 0;
2736}
2737
2738static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2739 const struct nft_set *set, u16 event, u16 flags)
2740{
2741 struct nfgenmsg *nfmsg;
2742 struct nlmsghdr *nlh;
c50b960c 2743 struct nlattr *desc;
128ad332
PNA		 2744 u32 portid = ctx->portid;
2745 u32 seq = ctx->seq;
20a69341 2746
dedb67c4 2747 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 2748 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2749 flags);
2750 if (nlh == NULL)
2751 goto nla_put_failure;
2752
2753 nfmsg = nlmsg_data(nlh);
2754 nfmsg->nfgen_family = ctx->afi->family;
2755 nfmsg->version = NFNETLINK_V0;
84d7fce6 2756 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2757
2758 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2759 goto nla_put_failure;
2760 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2761 goto nla_put_failure;
2762 if (set->flags != 0)
2763 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2764 goto nla_put_failure;
2765
2766 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2767 goto nla_put_failure;
2768 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2769 goto nla_put_failure;
2770 if (set->flags & NFT_SET_MAP) {
2771 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2772 goto nla_put_failure;
2773 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2774 goto nla_put_failure;
2775 }
8aeff920
PNA		 2776 if (set->flags & NFT_SET_OBJECT &&
2777 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2778 goto nla_put_failure;
20a69341 2779
761da293 2780 if (set->timeout &&
d3e2a111
AP		 2781 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2782 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2783 NFTA_SET_PAD))
761da293
PM		 2784 goto nla_put_failure;
2785 if (set->gc_int &&
2786 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2787 goto nla_put_failure;
2788
9363dc4b
AB		 2789 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2790 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2791 goto nla_put_failure;
2792 }
2793
e6d8ecac
CFG		 2794 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2795 goto nla_put_failure;
2796
c50b960c
PM		 2797 desc = nla_nest_start(skb, NFTA_SET_DESC);
2798 if (desc == NULL)
2799 goto nla_put_failure;
2800 if (set->size &&
2801 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2802 goto nla_put_failure;
2803 nla_nest_end(skb, desc);
2804
053c095a
JB		 2805 nlmsg_end(skb, nlh);
2806 return 0;
20a69341
PM		 2807
2808nla_put_failure:
2809 nlmsg_trim(skb, nlh);
2810 return -1;
2811}
2812
25e94a99
PNA		 2813static void nf_tables_set_notify(const struct nft_ctx *ctx,
2814 const struct nft_set *set, int event,
2815 gfp_t gfp_flags)
20a69341
PM		 2816{
2817 struct sk_buff *skb;
128ad332 2818 u32 portid = ctx->portid;
20a69341
PM		 2819 int err;
2820
128ad332
PNA		 2821 if (!ctx->report &&
2822 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2823 return;
20a69341 2824
31f8441c 2825 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2826 if (skb == NULL)
2827 goto err;
2828
2829 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2830 if (err < 0) {
2831 kfree_skb(skb);
2832 goto err;
2833 }
2834
25e94a99
PNA		 2835 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2836 gfp_flags);
2837 return;
20a69341 2838err:
25e94a99 2839 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 2840}
2841
5b96af77 2842static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2843{
2844 const struct nft_set *set;
2845 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2846 struct nft_af_info *afi;
c9c8e485
PNA		 2847 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2848 struct net *net = sock_net(skb->sk);
2849 int cur_family = cb->args[3];
5b96af77 2850 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2851
2852 if (cb->args[1])
2853 return skb->len;
2854
e688a7f8 2855 rcu_read_lock();
38e029f1
PNA		 2856 cb->seq = net->nft.base_seq;
2857
e688a7f8 2858 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2859 if (ctx->afi && ctx->afi != afi)
2860 continue;
2861
c9c8e485
PNA		 2862 if (cur_family) {
2863 if (afi->family != cur_family)
2864 continue;
2865
2866 cur_family = 0;
2867 }
e688a7f8 2868 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2869 if (ctx->table && ctx->table != table)
2870 continue;
2871
c9c8e485
PNA		 2872 if (cur_table) {
2873 if (cur_table != table)
2874 continue;
2875
2876 cur_table = NULL;
2877 }
c9c8e485 2878 idx = 0;
5b96af77 2879 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2880 if (idx < s_idx)
2881 goto cont;
37a9cc52
PNA		 2882 if (!nft_is_active(net, set))
2883 goto cont;
5b96af77
PNA		 2884
2885 ctx_set = *ctx;
2886 ctx_set.table = table;
2887 ctx_set.afi = afi;
2888 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2889 NFT_MSG_NEWSET,
2890 NLM_F_MULTI) < 0) {
2891 cb->args[0] = idx;
2892 cb->args[2] = (unsigned long) table;
2893 cb->args[3] = afi->family;
2894 goto done;
2895 }
38e029f1 2896 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2897cont:
2898 idx++;
2899 }
2900 if (s_idx)
2901 s_idx = 0;
2902 }
2903 }
2904 cb->args[1] = 1;
2905done:
e688a7f8 2906 rcu_read_unlock();
c9c8e485
PNA		 2907 return skb->len;
2908}
2909
5b96af77 2910static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2911{
5b96af77
PNA		 2912 kfree(cb->data);
2913 return 0;
20a69341
PM		 2914}
2915
7b8002a1
PNA		 2916static int nf_tables_getset(struct net *net, struct sock *nlsk,
2917 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2918 const struct nlattr * const nla[],
2919 struct netlink_ext_ack *extack)
20a69341 2920{
f2a6d766 2921 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2922 const struct nft_set *set;
2923 struct nft_ctx ctx;
2924 struct sk_buff *skb2;
c9c8e485 2925 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2926 int err;
2927
01cfa0a4 2928 /* Verify existence before starting dump */
f2a6d766 2929 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2930 if (err < 0)
2931 return err;
2932
2933 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2934 struct netlink_dump_control c = {
2935 .dump = nf_tables_dump_sets,
5b96af77 2936 .done = nf_tables_dump_sets_done,
20a69341 2937 };
5b96af77
PNA		 2938 struct nft_ctx *ctx_dump;
2939
2940 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2941 if (ctx_dump == NULL)
2942 return -ENOMEM;
2943
2944 *ctx_dump = ctx;
2945 c.data = ctx_dump;
2946
20a69341
PM		 2947 return netlink_dump_start(nlsk, skb, nlh, &c);
2948 }
2949
c9c8e485
PNA		 2950 /* Only accept unspec with dump */
2951 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2952 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2953 if (!nla[NFTA_SET_TABLE])
2954 return -EINVAL;
c9c8e485 2955
37a9cc52 2956 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2957 if (IS_ERR(set))
2958 return PTR_ERR(set);
2959
2960 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2961 if (skb2 == NULL)
2962 return -ENOMEM;
2963
2964 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2965 if (err < 0)
2966 goto err;
2967
2968 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2969
2970err:
2971 kfree_skb(skb2);
2972 return err;
2973}
2974
c50b960c
PM		 2975static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2976 struct nft_set_desc *desc,
2977 const struct nlattr *nla)
2978{
2979 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2980 int err;
2981
fceb6435
JB		 2982 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2983 nft_set_desc_policy, NULL);
c50b960c
PM		 2984 if (err < 0)
2985 return err;
2986
2987 if (da[NFTA_SET_DESC_SIZE] != NULL)
2988 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2989
2990 return 0;
2991}
2992
633c9a84
PNA		 2993static int nf_tables_newset(struct net *net, struct sock *nlsk,
2994 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2995 const struct nlattr * const nla[],
2996 struct netlink_ext_ack *extack)
20a69341
PM		 2997{
2998 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2999 u8 genmask = nft_genmask_next(net);
20a69341 3000 const struct nft_set_ops *ops;
7c95f6d8 3001 struct nft_af_info *afi;
20a69341
PM		 3002 struct nft_table *table;
3003 struct nft_set *set;
3004 struct nft_ctx ctx;
38745490 3005 char *name;
20a69341
PM		 3006 unsigned int size;
3007 bool create;
761da293 3008 u64 timeout;
8aeff920 3009 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 3010 struct nft_set_desc desc;
e6d8ecac
CFG		 3011 unsigned char *udata;
3012 u16 udlen;
20a69341
PM		 3013 int err;
3014
3015 if (nla[NFTA_SET_TABLE] == NULL ||
3016 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 3017 nla[NFTA_SET_KEY_LEN] == NULL ||
3018 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 3019 return -EINVAL;
3020
c50b960c
PM		 3021 memset(&desc, 0, sizeof(desc));
3022
20a69341
PM		 3023 ktype = NFT_DATA_VALUE;
3024 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3025 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3026 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3027 return -EINVAL;
3028 }
3029
c50b960c 3030 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 3031 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3032 return -EINVAL;
3033
3034 flags = 0;
3035 if (nla[NFTA_SET_FLAGS] != NULL) {
3036 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3037 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 3038 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 3039 NFT_SET_MAP | NFT_SET_EVAL |
3040 NFT_SET_OBJECT))
20a69341 3041 return -EINVAL;
8aeff920
PNA		 3042 /* Only one of these operations is supported */
3043 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3044 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3045 return -EOPNOTSUPP;
20a69341
PM		 3046 }
3047
3048 dtype = 0;
20a69341
PM		 3049 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3050 if (!(flags & NFT_SET_MAP))
3051 return -EINVAL;
3052
3053 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3054 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3055 dtype != NFT_DATA_VERDICT)
3056 return -EINVAL;
3057
3058 if (dtype != NFT_DATA_VERDICT) {
3059 if (nla[NFTA_SET_DATA_LEN] == NULL)
3060 return -EINVAL;
c50b960c 3061 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 3062 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3063 return -EINVAL;
3064 } else
7d740264 3065 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 3066 } else if (flags & NFT_SET_MAP)
3067 return -EINVAL;
3068
8aeff920
PNA		 3069 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3070 if (!(flags & NFT_SET_OBJECT))
3071 return -EINVAL;
3072
3073 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3074 if (objtype == NFT_OBJECT_UNSPEC ||
3075 objtype > NFT_OBJECT_MAX)
3076 return -EINVAL;
3077 } else if (flags & NFT_SET_OBJECT)
3078 return -EINVAL;
3079 else
3080 objtype = NFT_OBJECT_UNSPEC;
3081
761da293
PM		 3082 timeout = 0;
3083 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3084 if (!(flags & NFT_SET_TIMEOUT))
3085 return -EINVAL;
d3e2a111
AP		 3086 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3087 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 3088 }
3089 gc_int = 0;
3090 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3091 if (!(flags & NFT_SET_TIMEOUT))
3092 return -EINVAL;
3093 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3094 }
3095
c50b960c
PM		 3096 policy = NFT_SET_POL_PERFORMANCE;
3097 if (nla[NFTA_SET_POLICY] != NULL)
3098 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3099
3100 if (nla[NFTA_SET_DESC] != NULL) {
3101 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3102 if (err < 0)
3103 return err;
3104 }
3105
20a69341
PM		 3106 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3107
99633ab2 3108 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 3109 if (IS_ERR(afi))
3110 return PTR_ERR(afi);
3111
f2a6d766 3112 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 3113 if (IS_ERR(table))
3114 return PTR_ERR(table);
3115
633c9a84 3116 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3117
37a9cc52 3118 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3119 if (IS_ERR(set)) {
3120 if (PTR_ERR(set) != -ENOENT)
3121 return PTR_ERR(set);
1a28ad74 3122 } else {
20a69341
PM		 3123 if (nlh->nlmsg_flags & NLM_F_EXCL)
3124 return -EEXIST;
3125 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3126 return -EOPNOTSUPP;
3127 return 0;
3128 }
3129
3130 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3131 return -ENOENT;
3132
2b664957 3133 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 3134 if (IS_ERR(ops))
3135 return PTR_ERR(ops);
3136
e6d8ecac
CFG		 3137 udlen = 0;
3138 if (nla[NFTA_SET_USERDATA])
3139 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3140
20a69341
PM		 3141 size = 0;
3142 if (ops->privsize != NULL)
347b408d 3143 size = ops->privsize(nla, &desc);
20a69341 3144
1ff75a3e
PNA		 3145 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3146 if (!set) {
3147 err = -ENOMEM;
20a69341 3148 goto err1;
1ff75a3e 3149 }
20a69341 3150
38745490
PS		 3151 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3152 if (!name) {
3153 err = -ENOMEM;
3154 goto err2;
3155 }
3156
20a69341 3157 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 3158 kfree(name);
20a69341
PM		 3159 if (err < 0)
3160 goto err2;
3161
e6d8ecac
CFG		 3162 udata = NULL;
3163 if (udlen) {
3164 udata = set->data + size;
3165 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3166 }
3167
20a69341
PM		 3168 INIT_LIST_HEAD(&set->bindings);
3169 set->ops = ops;
3170 set->ktype = ktype;
c50b960c 3171 set->klen = desc.klen;
20a69341 3172 set->dtype = dtype;
8aeff920 3173 set->objtype = objtype;
c50b960c 3174 set->dlen = desc.dlen;
20a69341 3175 set->flags = flags;
c50b960c 3176 set->size = desc.size;
9363dc4b 3177 set->policy = policy;
e6d8ecac
CFG		 3178 set->udlen = udlen;
3179 set->udata = udata;
761da293
PM		 3180 set->timeout = timeout;
3181 set->gc_int = gc_int;
20a69341 3182
c50b960c 3183 err = ops->init(set, &desc, nla);
20a69341
PM		 3184 if (err < 0)
3185 goto err2;
3186
958bee14 3187 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3188 if (err < 0)
c17c3cdf 3189 goto err3;
20a69341 3190
e688a7f8 3191 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3192 table->use++;
20a69341
PM		 3193 return 0;
3194
c17c3cdf
LZ		 3195err3:
3196 ops->destroy(set);
20a69341 3197err2:
1ff75a3e 3198 kvfree(set);
20a69341 3199err1:
2b664957 3200 module_put(ops->type->owner);
20a69341
PM		 3201 return err;
3202}
3203
958bee14 3204static void nft_set_destroy(struct nft_set *set)
20a69341 3205{
20a69341 3206 set->ops->destroy(set);
2b664957 3207 module_put(set->ops->type->owner);
38745490 3208 kfree(set->name);
1ff75a3e 3209 kvfree(set);
20a69341
PM		 3210}
3211
958bee14
PNA		 3212static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3213{
e688a7f8 3214 list_del_rcu(&set->list);
31f8441c 3215 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3216 nft_set_destroy(set);
3217}
3218
633c9a84
PNA		 3219static int nf_tables_delset(struct net *net, struct sock *nlsk,
3220 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3221 const struct nlattr * const nla[],
3222 struct netlink_ext_ack *extack)
20a69341 3223{
c9c8e485 3224 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3225 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3226 struct nft_set *set;
3227 struct nft_ctx ctx;
3228 int err;
3229
ec2c9935
PM		 3230 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3231 return -EAFNOSUPPORT;
20a69341
PM		 3232 if (nla[NFTA_SET_TABLE] == NULL)
3233 return -EINVAL;
3234
f2a6d766 3235 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3236 if (err < 0)
3237 return err;
3238
37a9cc52 3239 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3240 if (IS_ERR(set))
3241 return PTR_ERR(set);
a8278400
PNA		 3242
3243 if (!list_empty(&set->bindings) ||
3244 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0))
20a69341
PM		 3245 return -EBUSY;
3246
ee01d542 3247 return nft_delset(&ctx, set);
20a69341
PM		 3248}
3249
3250static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3251 struct nft_set *set,
20a69341 3252 const struct nft_set_iter *iter,
de70185d 3253 struct nft_set_elem *elem)
20a69341 3254{
fe2811eb 3255 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3256 enum nft_registers dreg;
3257
3258 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3259 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3260 set->dtype == NFT_DATA_VERDICT ?
3261 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3262 set->dlen);
20a69341
PM		 3263}
3264
3265int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3266 struct nft_set_binding *binding)
3267{
3268 struct nft_set_binding *i;
3269 struct nft_set_iter iter;
3270
408070d6 3271 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 3272 return -EBUSY;
3273
11113e19 3274 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3275 /* If the set is already bound to the same chain all
3276 * jumps are already validated for that chain.
3277 */
3278 list_for_each_entry(i, &set->bindings, list) {
a4684402 3279 if (i->flags & NFT_SET_MAP &&
11113e19 3280 i->chain == binding->chain)
20a69341
PM		 3281 goto bind;
3282 }
3283
8588ac09 3284 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3285 iter.skip = 0;
3286 iter.count = 0;
3287 iter.err = 0;
3288 iter.fn = nf_tables_bind_check_setelem;
3289
3290 set->ops->walk(ctx, set, &iter);
a02f4248 3291 if (iter.err < 0)
20a69341 3292 return iter.err;
20a69341
PM		 3293 }
3294bind:
3295 binding->chain = ctx->chain;
e688a7f8 3296 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3297 return 0;
3298}
63aea290 3299EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3300
3301void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3302 struct nft_set_binding *binding)
3303{
e688a7f8 3304 list_del_rcu(&binding->list);
20a69341 3305
408070d6 3306 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
37a9cc52 3307 nft_is_active(ctx->net, set))
20a69341
PM		 3308 nf_tables_set_destroy(ctx, set);
3309}
63aea290 3310EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3311
3ac4c07a
PM		 3312const struct nft_set_ext_type nft_set_ext_types[] = {
3313 [NFT_SET_EXT_KEY] = {
7d740264 3314 .align = __alignof__(u32),
3ac4c07a
PM		 3315 },
3316 [NFT_SET_EXT_DATA] = {
7d740264 3317 .align = __alignof__(u32),
3ac4c07a 3318 },
f25ad2e9
PM		 3319 [NFT_SET_EXT_EXPR] = {
3320 .align = __alignof__(struct nft_expr),
3321 },
8aeff920
PNA		 3322 [NFT_SET_EXT_OBJREF] = {
3323 .len = sizeof(struct nft_object *),
3324 .align = __alignof__(struct nft_object *),
3325 },
3ac4c07a
PM		 3326 [NFT_SET_EXT_FLAGS] = {
3327 .len = sizeof(u8),
3328 .align = __alignof__(u8),
3329 },
c3e1b005
PM		 3330 [NFT_SET_EXT_TIMEOUT] = {
3331 .len = sizeof(u64),
3332 .align = __alignof__(u64),
3333 },
3334 [NFT_SET_EXT_EXPIRATION] = {
3335 .len = sizeof(unsigned long),
3336 .align = __alignof__(unsigned long),
3337 },
68e942e8
PM		 3338 [NFT_SET_EXT_USERDATA] = {
3339 .len = sizeof(struct nft_userdata),
3340 .align = __alignof__(struct nft_userdata),
3341 },
3ac4c07a
PM		 3342};
3343EXPORT_SYMBOL_GPL(nft_set_ext_types);
3344
20a69341
PM		 3345/*
3346 * Set elements
3347 */
3348
3349static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3350 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3351 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3352 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3353 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3354 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3355 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3356};
3357
3358static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3359 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3360 .len = NFT_TABLE_MAXNAMELEN - 1 },
3361 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3362 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3363 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3364 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3365};
3366
633c9a84 3367static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3368 const struct sk_buff *skb,
3369 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3370 const struct nlattr * const nla[],
3371 u8 genmask)
20a69341
PM		 3372{
3373 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3374 struct nft_af_info *afi;
3375 struct nft_table *table;
20a69341 3376
99633ab2 3377 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3378 if (IS_ERR(afi))
3379 return PTR_ERR(afi);
3380
f2a6d766
PNA		 3381 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3382 genmask);
20a69341
PM		 3383 if (IS_ERR(table))
3384 return PTR_ERR(table);
3385
633c9a84 3386 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3387 return 0;
3388}
3389
3390static int nf_tables_fill_setelem(struct sk_buff *skb,
3391 const struct nft_set *set,
3392 const struct nft_set_elem *elem)
3393{
fe2811eb 3394 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3395 unsigned char *b = skb_tail_pointer(skb);
3396 struct nlattr *nest;
3397
3398 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3399 if (nest == NULL)
3400 goto nla_put_failure;
3401
fe2811eb
PM		 3402 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3403 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3404 goto nla_put_failure;
3405
fe2811eb
PM		 3406 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3407 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3408 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3409 set->dlen) < 0)
3410 goto nla_put_failure;
3411
f25ad2e9
PM		 3412 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3413 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3414 goto nla_put_failure;
3415
8aeff920
PNA		 3416 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3417 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3418 (*nft_set_ext_obj(ext))->name) < 0)
3419 goto nla_put_failure;
3420
fe2811eb
PM		 3421 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3422 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3423 htonl(*nft_set_ext_flags(ext))))
3424 goto nla_put_failure;
20a69341 3425
c3e1b005
PM		 3426 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3427 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3428 cpu_to_be64(jiffies_to_msecs(
3429 *nft_set_ext_timeout(ext))),
b46f6ded 3430 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3431 goto nla_put_failure;
3432
3433 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3434 unsigned long expires, now = jiffies;
3435
3436 expires = *nft_set_ext_expiration(ext);
3437 if (time_before(now, expires))
3438 expires -= now;
3439 else
3440 expires = 0;
3441
3442 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3443 cpu_to_be64(jiffies_to_msecs(expires)),
3444 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3445 goto nla_put_failure;
3446 }
3447
68e942e8
PM		 3448 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3449 struct nft_userdata *udata;
3450
3451 udata = nft_set_ext_userdata(ext);
3452 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3453 udata->len + 1, udata->data))
3454 goto nla_put_failure;
3455 }
3456
20a69341
PM		 3457 nla_nest_end(skb, nest);
3458 return 0;
3459
3460nla_put_failure:
3461 nlmsg_trim(skb, b);
3462 return -EMSGSIZE;
3463}
3464
3465struct nft_set_dump_args {
3466 const struct netlink_callback *cb;
3467 struct nft_set_iter iter;
3468 struct sk_buff *skb;
3469};
3470
3471static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3472 struct nft_set *set,
20a69341 3473 const struct nft_set_iter *iter,
de70185d 3474 struct nft_set_elem *elem)
20a69341
PM		 3475{
3476 struct nft_set_dump_args *args;
3477
3478 args = container_of(iter, struct nft_set_dump_args, iter);
3479 return nf_tables_fill_setelem(args->skb, set, elem);
3480}
3481
fa803605
LZ		 3482struct nft_set_dump_ctx {
3483 const struct nft_set *set;
3484 struct nft_ctx ctx;
3485};
3486
20a69341
PM		 3487static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3488{
fa803605 3489 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 3490 struct net *net = sock_net(skb->sk);
fa803605
LZ		 3491 struct nft_af_info *afi;
3492 struct nft_table *table;
de70185d 3493 struct nft_set *set;
20a69341 3494 struct nft_set_dump_args args;
fa803605 3495 bool set_found = false;
20a69341
PM		 3496 struct nfgenmsg *nfmsg;
3497 struct nlmsghdr *nlh;
3498 struct nlattr *nest;
3499 u32 portid, seq;
fa803605 3500 int event;
20a69341 3501
fa803605
LZ		 3502 rcu_read_lock();
3503 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3504 if (afi != dump_ctx->ctx.afi)
3505 continue;
20a69341 3506
fa803605
LZ		 3507 list_for_each_entry_rcu(table, &afi->tables, list) {
3508 if (table != dump_ctx->ctx.table)
3509 continue;
20a69341 3510
fa803605
LZ		 3511 list_for_each_entry_rcu(set, &table->sets, list) {
3512 if (set == dump_ctx->set) {
3513 set_found = true;
3514 break;
3515 }
3516 }
3517 break;
3518 }
3519 break;
3520 }
3521
3522 if (!set_found) {
3523 rcu_read_unlock();
3524 return -ENOENT;
3525 }
20a69341 3526
dedb67c4 3527 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3528 portid = NETLINK_CB(cb->skb).portid;
3529 seq = cb->nlh->nlmsg_seq;
3530
3531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3532 NLM_F_MULTI);
3533 if (nlh == NULL)
3534 goto nla_put_failure;
3535
3536 nfmsg = nlmsg_data(nlh);
fa803605 3537 nfmsg->nfgen_family = afi->family;
20a69341 3538 nfmsg->version = NFNETLINK_V0;
fa803605 3539 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 3540
fa803605 3541 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 3542 goto nla_put_failure;
3543 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3544 goto nla_put_failure;
3545
3546 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3547 if (nest == NULL)
3548 goto nla_put_failure;
3549
8588ac09
PNA		 3550 args.cb = cb;
3551 args.skb = skb;
fa803605 3552 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 3553 args.iter.skip = cb->args[0];
3554 args.iter.count = 0;
3555 args.iter.err = 0;
3556 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 3557 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3558 rcu_read_unlock();
20a69341
PM		 3559
3560 nla_nest_end(skb, nest);
3561 nlmsg_end(skb, nlh);
3562
3563 if (args.iter.err && args.iter.err != -EMSGSIZE)
3564 return args.iter.err;
3565 if (args.iter.count == cb->args[0])
3566 return 0;
3567
3568 cb->args[0] = args.iter.count;
3569 return skb->len;
3570
3571nla_put_failure:
fa803605 3572 rcu_read_unlock();
20a69341
PM		 3573 return -ENOSPC;
3574}
3575
fa803605
LZ		 3576static int nf_tables_dump_set_done(struct netlink_callback *cb)
3577{
3578 kfree(cb->data);
3579 return 0;
3580}
3581
d60ce62f
AB		 3582static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3583 const struct nft_ctx *ctx, u32 seq,
3584 u32 portid, int event, u16 flags,
3585 const struct nft_set *set,
3586 const struct nft_set_elem *elem)
3587{
3588 struct nfgenmsg *nfmsg;
3589 struct nlmsghdr *nlh;
3590 struct nlattr *nest;
3591 int err;
3592
dedb67c4 3593 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 3594 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3595 flags);
3596 if (nlh == NULL)
3597 goto nla_put_failure;
3598
3599 nfmsg = nlmsg_data(nlh);
3600 nfmsg->nfgen_family = ctx->afi->family;
3601 nfmsg->version = NFNETLINK_V0;
84d7fce6 3602 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3603
3604 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3605 goto nla_put_failure;
3606 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3607 goto nla_put_failure;
3608
3609 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3610 if (nest == NULL)
3611 goto nla_put_failure;
3612
3613 err = nf_tables_fill_setelem(skb, set, elem);
3614 if (err < 0)
3615 goto nla_put_failure;
3616
3617 nla_nest_end(skb, nest);
3618
053c095a
JB		 3619 nlmsg_end(skb, nlh);
3620 return 0;
d60ce62f
AB		 3621
3622nla_put_failure:
3623 nlmsg_trim(skb, nlh);
3624 return -1;
3625}
3626
ba0e4d99
PNA		 3627static int nft_setelem_parse_flags(const struct nft_set *set,
3628 const struct nlattr *attr, u32 *flags)
3629{
3630 if (attr == NULL)
3631 return 0;
3632
3633 *flags = ntohl(nla_get_be32(attr));
3634 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3635 return -EINVAL;
3636 if (!(set->flags & NFT_SET_INTERVAL) &&
3637 *flags & NFT_SET_ELEM_INTERVAL_END)
3638 return -EINVAL;
3639
3640 return 0;
3641}
3642
3643static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3644 const struct nlattr *attr)
3645{
3646 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3647 const struct nft_set_ext *ext;
3648 struct nft_data_desc desc;
3649 struct nft_set_elem elem;
3650 struct sk_buff *skb;
3651 uint32_t flags = 0;
3652 void *priv;
3653 int err;
3654
3655 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3656 nft_set_elem_policy, NULL);
3657 if (err < 0)
3658 return err;
3659
3660 if (!nla[NFTA_SET_ELEM_KEY])
3661 return -EINVAL;
3662
3663 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3664 if (err < 0)
3665 return err;
3666
3667 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3668 nla[NFTA_SET_ELEM_KEY]);
3669 if (err < 0)
3670 return err;
3671
3672 err = -EINVAL;
3673 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3674 return err;
3675
3676 priv = set->ops->get(ctx->net, set, &elem, flags);
3677 if (IS_ERR(priv))
3678 return PTR_ERR(priv);
3679
3680 elem.priv = priv;
3681 ext = nft_set_elem_ext(set, &elem);
3682
3683 err = -ENOMEM;
3684 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3685 if (skb == NULL)
3686 goto err1;
3687
3688 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
3689 NFT_MSG_NEWSETELEM, 0, set, &elem);
3690 if (err < 0)
3691 goto err2;
3692
3693 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
3694 /* This avoids a loop in nfnetlink. */
3695 if (err < 0)
3696 goto err1;
3697
3698 return 0;
3699err2:
3700 kfree_skb(skb);
3701err1:
3702 /* this avoids a loop in nfnetlink. */
3703 return err == -EAGAIN ? -ENOBUFS : err;
3704}
3705
3706static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3707 struct sk_buff *skb, const struct nlmsghdr *nlh,
3708 const struct nlattr * const nla[],
3709 struct netlink_ext_ack *extack)
3710{
3711 u8 genmask = nft_genmask_cur(net);
3712 struct nft_set *set;
3713 struct nlattr *attr;
3714 struct nft_ctx ctx;
3715 int rem, err = 0;
3716
3717 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3718 if (err < 0)
3719 return err;
3720
3721 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3722 genmask);
3723 if (IS_ERR(set))
3724 return PTR_ERR(set);
3725
3726 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3727 struct netlink_dump_control c = {
3728 .dump = nf_tables_dump_set,
3729 .done = nf_tables_dump_set_done,
3730 };
3731 struct nft_set_dump_ctx *dump_ctx;
3732
3733 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3734 if (!dump_ctx)
3735 return -ENOMEM;
3736
3737 dump_ctx->set = set;
3738 dump_ctx->ctx = ctx;
3739
3740 c.data = dump_ctx;
3741 return netlink_dump_start(nlsk, skb, nlh, &c);
3742 }
3743
3744 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
3745 return -EINVAL;
3746
3747 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3748 err = nft_get_set_elem(&ctx, set, attr);
3749 if (err < 0)
3750 break;
3751 }
3752
3753 return err;
3754}
3755
25e94a99
PNA		 3756static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3757 const struct nft_set *set,
3758 const struct nft_set_elem *elem,
3759 int event, u16 flags)
d60ce62f 3760{
128ad332
PNA		 3761 struct net *net = ctx->net;
3762 u32 portid = ctx->portid;
d60ce62f
AB		 3763 struct sk_buff *skb;
3764 int err;
3765
128ad332 3766 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 3767 return;
d60ce62f 3768
d60ce62f
AB		 3769 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3770 if (skb == NULL)
3771 goto err;
3772
3773 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3774 set, elem);
3775 if (err < 0) {
3776 kfree_skb(skb);
3777 goto err;
3778 }
3779
25e94a99
PNA		 3780 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3781 GFP_KERNEL);
3782 return;
d60ce62f 3783err:
25e94a99 3784 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 3785}
3786
60319eb1
PNA		 3787static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3788 int msg_type,
3789 struct nft_set *set)
3790{
3791 struct nft_trans *trans;
3792
3793 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3794 if (trans == NULL)
3795 return NULL;
3796
3797 nft_trans_elem_set(trans) = set;
3798 return trans;
3799}
3800
22fe54d5
PM		 3801void *nft_set_elem_init(const struct nft_set *set,
3802 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3803 const u32 *key, const u32 *data,
22fe54d5 3804 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3805{
3806 struct nft_set_ext *ext;
3807 void *elem;
3808
3809 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3810 if (elem == NULL)
3811 return NULL;
3812
3813 ext = nft_set_elem_ext(set, elem);
3814 nft_set_ext_init(ext, tmpl);
3815
3816 memcpy(nft_set_ext_key(ext), key, set->klen);
3817 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3818 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3819 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3820 *nft_set_ext_expiration(ext) =
d3e2a111 3821 jiffies + timeout;
c3e1b005
PM		 3822 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3823 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3824
3825 return elem;
3826}
3827
61f9e292
LZ		 3828void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3829 bool destroy_expr)
61edafbb
PM		 3830{
3831 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3832
59105446 3833 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 3834 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 3835 nft_data_release(nft_set_ext_data(ext), set->dtype);
61f9e292 3836 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3837 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3838 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3839 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3840 kfree(elem);
3841}
3842EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3843
59105446
PNA		 3844/* Only called from commit path, nft_set_elem_deactivate() already deals with
3845 * the refcounting from the preparation phase.
3846 */
3847static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3848{
3849 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3850
3851 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3852 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3853 kfree(elem);
3854}
3855
60319eb1 3856static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3857 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3858{
3859 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3860 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3861 struct nft_data_desc d1, d2;
fe2811eb 3862 struct nft_set_ext_tmpl tmpl;
c016c7e4 3863 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3864 struct nft_set_elem elem;
3865 struct nft_set_binding *binding;
8aeff920 3866 struct nft_object *obj = NULL;
68e942e8 3867 struct nft_userdata *udata;
fe2811eb 3868 struct nft_data data;
20a69341 3869 enum nft_registers dreg;
60319eb1 3870 struct nft_trans *trans;
0e9091d6 3871 u32 flags = 0;
c3e1b005 3872 u64 timeout;
68e942e8 3873 u8 ulen;
20a69341
PM		 3874 int err;
3875
3876 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3877 nft_set_elem_policy, NULL);
20a69341
PM		 3878 if (err < 0)
3879 return err;
3880
3881 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3882 return -EINVAL;
3883
fe2811eb
PM		 3884 nft_set_ext_prepare(&tmpl);
3885
0e9091d6
PNA		 3886 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3887 if (err < 0)
3888 return err;
3889 if (flags != 0)
3890 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3891
3892 if (set->flags & NFT_SET_MAP) {
3893 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3894 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3895 return -EINVAL;
bd7fc645 3896 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3897 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3898 return -EINVAL;
20a69341
PM		 3899 } else {
3900 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3901 return -EINVAL;
3902 }
3903
c3e1b005
PM		 3904 timeout = 0;
3905 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3906 if (!(set->flags & NFT_SET_TIMEOUT))
3907 return -EINVAL;
d3e2a111
AP		 3908 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3909 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3910 } else if (set->flags & NFT_SET_TIMEOUT) {
3911 timeout = set->timeout;
3912 }
3913
7d740264 3914 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3915 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3916 if (err < 0)
3917 goto err1;
3918 err = -EINVAL;
3919 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3920 goto err2;
3921
7d740264 3922 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3923 if (timeout > 0) {
3924 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3925 if (timeout != set->timeout)
3926 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3927 }
fe2811eb 3928
8aeff920
PNA		 3929 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3930 if (!(set->flags & NFT_SET_OBJECT)) {
3931 err = -EINVAL;
3932 goto err2;
3933 }
3934 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3935 set->objtype, genmask);
3936 if (IS_ERR(obj)) {
3937 err = PTR_ERR(obj);
3938 goto err2;
3939 }
3940 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3941 }
3942
20a69341 3943 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3944 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3945 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3946 if (err < 0)
3947 goto err2;
3948
3949 err = -EINVAL;
3950 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3951 goto err3;
3952
3953 dreg = nft_type_to_reg(set->dtype);
3954 list_for_each_entry(binding, &set->bindings, list) {
3955 struct nft_ctx bind_ctx = {
58c78e10 3956 .net = ctx->net,
20a69341
PM		 3957 .afi = ctx->afi,
3958 .table = ctx->table,
7c95f6d8 3959 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3960 };
3961
11113e19
PM		 3962 if (!(binding->flags & NFT_SET_MAP))
3963 continue;
3964
1ec10212
PM		 3965 err = nft_validate_register_store(&bind_ctx, dreg,
3966 &data,
3967 d2.type, d2.len);
20a69341
PM		 3968 if (err < 0)
3969 goto err3;
3970 }
fe2811eb 3971
7d740264 3972 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3973 }
3974
68e942e8
PM		 3975 /* The full maximum length of userdata can exceed the maximum
3976 * offset value (U8_MAX) for following extensions, therefor it
3977 * must be the last extension added.
3978 */
3979 ulen = 0;
3980 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3981 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3982 if (ulen > 0)
3983 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3984 ulen);
3985 }
3986
fe2811eb 3987 err = -ENOMEM;
7d740264 3988 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3989 timeout, GFP_KERNEL);
fe2811eb
PM		 3990 if (elem.priv == NULL)
3991 goto err3;
3992
3993 ext = nft_set_elem_ext(set, elem.priv);
3994 if (flags)
3995 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3996 if (ulen > 0) {
3997 udata = nft_set_ext_userdata(ext);
3998 udata->len = ulen - 1;
3999 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4000 }
8aeff920
PNA		 4001 if (obj) {
4002 *nft_set_ext_obj(ext) = obj;
4003 obj->use++;
4004 }
fe2811eb 4005
60319eb1
PNA		 4006 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4007 if (trans == NULL)
fe2811eb 4008 goto err4;
60319eb1 4009
69086658 4010 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 4011 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4012 if (err) {
4013 if (err == -EEXIST) {
9744a6fc
PNA		 4014 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4015 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4016 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4017 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
4018 return -EBUSY;
8aeff920
PNA		 4019 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4020 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4021 memcmp(nft_set_ext_data(ext),
4022 nft_set_ext_data(ext2), set->dlen) != 0) ||
4023 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4024 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4025 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 4026 err = -EBUSY;
4027 else if (!(nlmsg_flags & NLM_F_EXCL))
4028 err = 0;
4029 }
fe2811eb 4030 goto err5;
c016c7e4 4031 }
20a69341 4032
35d0ac90
PNA		 4033 if (set->size &&
4034 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4035 err = -ENFILE;
4036 goto err6;
4037 }
4038
60319eb1 4039 nft_trans_elem(trans) = elem;
46bbafce 4040 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 4041 return 0;
4042
35d0ac90 4043err6:
5cb82a38 4044 set->ops->remove(ctx->net, set, &elem);
fe2811eb 4045err5:
60319eb1 4046 kfree(trans);
fe2811eb
PM		 4047err4:
4048 kfree(elem.priv);
20a69341
PM		 4049err3:
4050 if (nla[NFTA_SET_ELEM_DATA] != NULL)
59105446 4051 nft_data_release(&data, d2.type);
20a69341 4052err2:
59105446 4053 nft_data_release(&elem.key.val, d1.type);
20a69341
PM		 4054err1:
4055 return err;
4056}
4057
633c9a84
PNA		 4058static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4059 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4060 const struct nlattr * const nla[],
4061 struct netlink_ext_ack *extack)
20a69341 4062{
f2a6d766 4063 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4064 const struct nlattr *attr;
4065 struct nft_set *set;
4066 struct nft_ctx ctx;
60319eb1 4067 int rem, err = 0;
20a69341 4068
7d5570ca
PNA		 4069 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4070 return -EINVAL;
4071
f2a6d766 4072 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 4073 if (err < 0)
4074 return err;
4075
37a9cc52
PNA		 4076 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4077 genmask);
958bee14
PNA		 4078 if (IS_ERR(set)) {
4079 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
4080 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 4081 nla[NFTA_SET_ELEM_LIST_SET_ID],
4082 genmask);
958bee14
PNA		 4083 }
4084 if (IS_ERR(set))
4085 return PTR_ERR(set);
4086 }
4087
20a69341
PM		 4088 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4089 return -EBUSY;
4090
4091 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 4092 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 4093 if (err < 0)
60319eb1 4094 break;
20a69341 4095 }
60319eb1 4096 return err;
20a69341
PM		 4097}
4098
59105446
PNA		 4099/**
4100 * nft_data_hold - hold a nft_data item
4101 *
4102 * @data: struct nft_data to release
4103 * @type: type of data
4104 *
4105 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4106 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4107 * NFT_GOTO verdicts. This function must be called on active data objects
4108 * from the second phase of the commit protocol.
4109 */
4110static void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4111{
4112 if (type == NFT_DATA_VERDICT) {
4113 switch (data->verdict.code) {
4114 case NFT_JUMP:
4115 case NFT_GOTO:
4116 data->verdict.chain->use++;
4117 break;
4118 }
4119 }
4120}
4121
4122static void nft_set_elem_activate(const struct net *net,
4123 const struct nft_set *set,
4124 struct nft_set_elem *elem)
4125{
4126 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4127
4128 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4129 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4130 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4131 (*nft_set_ext_obj(ext))->use++;
4132}
4133
4134static void nft_set_elem_deactivate(const struct net *net,
4135 const struct nft_set *set,
4136 struct nft_set_elem *elem)
4137{
4138 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4139
4140 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4141 nft_data_release(nft_set_ext_data(ext), set->dtype);
4142 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4143 (*nft_set_ext_obj(ext))->use--;
4144}
4145
60319eb1 4146static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 4147 const struct nlattr *attr)
4148{
4149 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 4150 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 4151 struct nft_data_desc desc;
4152 struct nft_set_elem elem;
3971ca14 4153 struct nft_set_ext *ext;
60319eb1 4154 struct nft_trans *trans;
3971ca14
PNA		 4155 u32 flags = 0;
4156 void *priv;
20a69341
PM		 4157 int err;
4158
4159 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4160 nft_set_elem_policy, NULL);
20a69341
PM		 4161 if (err < 0)
4162 goto err1;
4163
4164 err = -EINVAL;
4165 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4166 goto err1;
4167
3971ca14
PNA		 4168 nft_set_ext_prepare(&tmpl);
4169
4170 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4171 if (err < 0)
4172 return err;
4173 if (flags != 0)
4174 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4175
7d740264 4176 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 4177 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4178 if (err < 0)
4179 goto err1;
4180
4181 err = -EINVAL;
4182 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4183 goto err2;
4184
3971ca14
PNA		 4185 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4186
4187 err = -ENOMEM;
4188 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4189 GFP_KERNEL);
4190 if (elem.priv == NULL)
4191 goto err2;
4192
4193 ext = nft_set_elem_ext(set, elem.priv);
4194 if (flags)
4195 *nft_set_ext_flags(ext) = flags;
4196
60319eb1 4197 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 4198 if (trans == NULL) {
4199 err = -ENOMEM;
3971ca14 4200 goto err3;
609ccf08 4201 }
20a69341 4202
42a55769 4203 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 4204 if (priv == NULL) {
cc02e457 4205 err = -ENOENT;
3971ca14 4206 goto err4;
cc02e457 4207 }
3971ca14
PNA		 4208 kfree(elem.priv);
4209 elem.priv = priv;
cc02e457 4210
59105446
PNA		 4211 nft_set_elem_deactivate(ctx->net, set, &elem);
4212
60319eb1 4213 nft_trans_elem(trans) = elem;
46bbafce 4214 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 4215 return 0;
cc02e457 4216
3971ca14 4217err4:
cc02e457 4218 kfree(trans);
3971ca14
PNA		 4219err3:
4220 kfree(elem.priv);
20a69341 4221err2:
59105446 4222 nft_data_release(&elem.key.val, desc.type);
20a69341
PM		 4223err1:
4224 return err;
4225}
4226
8411b644 4227static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 4228 struct nft_set *set,
8411b644 4229 const struct nft_set_iter *iter,
de70185d 4230 struct nft_set_elem *elem)
8411b644
PNA		 4231{
4232 struct nft_trans *trans;
4233 int err;
4234
4235 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4236 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4237 if (!trans)
4238 return -ENOMEM;
4239
1ba1c414 4240 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 4241 err = -ENOENT;
4242 goto err1;
4243 }
b2c11e4b 4244 set->ndeact++;
8411b644 4245
de70185d
PNA		 4246 nft_trans_elem_set(trans) = set;
4247 nft_trans_elem(trans) = *elem;
8411b644
PNA		 4248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4249
4250 return 0;
4251err1:
4252 kfree(trans);
4253 return err;
4254}
4255
633c9a84
PNA		 4256static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4257 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4258 const struct nlattr * const nla[],
4259 struct netlink_ext_ack *extack)
20a69341 4260{
f2a6d766 4261 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4262 const struct nlattr *attr;
4263 struct nft_set *set;
4264 struct nft_ctx ctx;
60319eb1 4265 int rem, err = 0;
20a69341 4266
f2a6d766 4267 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 4268 if (err < 0)
4269 return err;
4270
37a9cc52
PNA		 4271 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4272 genmask);
20a69341
PM		 4273 if (IS_ERR(set))
4274 return PTR_ERR(set);
4275 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4276 return -EBUSY;
4277
8411b644 4278 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 4279 struct nft_set_iter iter = {
4280 .genmask = genmask,
4281 .fn = nft_flush_set,
8411b644 4282 };
baa2d42c 4283 set->ops->walk(&ctx, set, &iter);
8411b644 4284
baa2d42c 4285 return iter.err;
8411b644
PNA		 4286 }
4287
20a69341
PM		 4288 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4289 err = nft_del_setelem(&ctx, set, attr);
4290 if (err < 0)
60319eb1 4291 break;
4fefee57 4292
3dd0673a 4293 set->ndeact++;
20a69341 4294 }
60319eb1 4295 return err;
20a69341
PM		 4296}
4297
cfed7e1b
PM		 4298void nft_set_gc_batch_release(struct rcu_head *rcu)
4299{
4300 struct nft_set_gc_batch *gcb;
4301 unsigned int i;
4302
4303 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4304 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4305 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4306 kfree(gcb);
4307}
4308EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4309
4310struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4311 gfp_t gfp)
4312{
4313 struct nft_set_gc_batch *gcb;
4314
4315 gcb = kzalloc(sizeof(*gcb), gfp);
4316 if (gcb == NULL)
4317 return gcb;
4318 gcb->head.set = set;
4319 return gcb;
4320}
4321EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4322
e5009240
PNA		 4323/*
4324 * Stateful objects
4325 */
4326
4327/**
4328 * nft_register_obj- register nf_tables stateful object type
4329 * @obj: object type
4330 *
4331 * Registers the object type for use with nf_tables. Returns zero on
4332 * success or a negative errno code otherwise.
4333 */
4334int nft_register_obj(struct nft_object_type *obj_type)
4335{
4336 if (obj_type->type == NFT_OBJECT_UNSPEC)
4337 return -EINVAL;
4338
4339 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4340 list_add_rcu(&obj_type->list, &nf_tables_objects);
4341 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4342 return 0;
4343}
4344EXPORT_SYMBOL_GPL(nft_register_obj);
4345
4346/**
4347 * nft_unregister_obj - unregister nf_tables object type
4348 * @obj: object type
4349 *
4350 * Unregisters the object type for use with nf_tables.
4351 */
4352void nft_unregister_obj(struct nft_object_type *obj_type)
4353{
4354 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4355 list_del_rcu(&obj_type->list);
4356 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4357}
4358EXPORT_SYMBOL_GPL(nft_unregister_obj);
4359
4360struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4361 const struct nlattr *nla,
4362 u32 objtype, u8 genmask)
4363{
4364 struct nft_object *obj;
4365
4366 list_for_each_entry(obj, &table->objects, list) {
4367 if (!nla_strcmp(nla, obj->name) &&
dfc46034 4368 objtype == obj->ops->type->type &&
e5009240
PNA		 4369 nft_active_genmask(obj, genmask))
4370 return obj;
4371 }
4372 return ERR_PTR(-ENOENT);
4373}
4374EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4375
4376static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4377 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4378 .len = NFT_TABLE_MAXNAMELEN - 1 },
4379 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4380 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4381 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4382 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4383};
4384
84fba055
FW		 4385static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4386 const struct nft_object_type *type,
e5009240
PNA		 4387 const struct nlattr *attr)
4388{
4389 struct nlattr *tb[type->maxattr + 1];
dfc46034 4390 const struct nft_object_ops *ops;
e5009240
PNA		 4391 struct nft_object *obj;
4392 int err;
4393
4394 if (attr) {
fceb6435
JB		 4395 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4396 NULL);
e5009240
PNA		 4397 if (err < 0)
4398 goto err1;
4399 } else {
4400 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4401 }
4402
dfc46034
PBG		 4403 if (type->select_ops) {
4404 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4405 if (IS_ERR(ops)) {
4406 err = PTR_ERR(ops);
4407 goto err1;
4408 }
4409 } else {
4410 ops = type->ops;
4411 }
4412
e5009240 4413 err = -ENOMEM;
dfc46034 4414 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
e5009240
PNA		 4415 if (obj == NULL)
4416 goto err1;
4417
dfc46034 4418 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240
PNA		 4419 if (err < 0)
4420 goto err2;
4421
dfc46034
PBG		 4422 obj->ops = ops;
4423
e5009240
PNA		 4424 return obj;
4425err2:
4426 kfree(obj);
4427err1:
4428 return ERR_PTR(err);
4429}
4430
4431static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4432 struct nft_object *obj, bool reset)
e5009240
PNA		 4433{
4434 struct nlattr *nest;
4435
4436 nest = nla_nest_start(skb, attr);
4437 if (!nest)
4438 goto nla_put_failure;
dfc46034 4439 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 4440 goto nla_put_failure;
4441 nla_nest_end(skb, nest);
4442 return 0;
4443
4444nla_put_failure:
4445 return -1;
4446}
4447
4448static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4449{
4450 const struct nft_object_type *type;
4451
4452 list_for_each_entry(type, &nf_tables_objects, list) {
4453 if (objtype == type->type)
4454 return type;
4455 }
4456 return NULL;
4457}
4458
4459static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4460{
4461 const struct nft_object_type *type;
4462
4463 type = __nft_obj_type_get(objtype);
4464 if (type != NULL && try_module_get(type->owner))
4465 return type;
4466
4467#ifdef CONFIG_MODULES
4468 if (type == NULL) {
4469 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4470 request_module("nft-obj-%u", objtype);
4471 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4472 if (__nft_obj_type_get(objtype))
4473 return ERR_PTR(-EAGAIN);
4474 }
4475#endif
4476 return ERR_PTR(-ENOENT);
4477}
4478
4479static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4480 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4481 const struct nlattr * const nla[],
4482 struct netlink_ext_ack *extack)
e5009240
PNA		 4483{
4484 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4485 const struct nft_object_type *type;
4486 u8 genmask = nft_genmask_next(net);
4487 int family = nfmsg->nfgen_family;
4488 struct nft_af_info *afi;
4489 struct nft_table *table;
4490 struct nft_object *obj;
4491 struct nft_ctx ctx;
4492 u32 objtype;
4493 int err;
4494
4495 if (!nla[NFTA_OBJ_TYPE] ||
4496 !nla[NFTA_OBJ_NAME] ||
4497 !nla[NFTA_OBJ_DATA])
4498 return -EINVAL;
4499
4500 afi = nf_tables_afinfo_lookup(net, family, true);
4501 if (IS_ERR(afi))
4502 return PTR_ERR(afi);
4503
4504 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4505 if (IS_ERR(table))
4506 return PTR_ERR(table);
4507
4508 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4509 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4510 if (IS_ERR(obj)) {
4511 err = PTR_ERR(obj);
4512 if (err != -ENOENT)
4513 return err;
4514
1a28ad74 4515 } else {
e5009240
PNA		 4516 if (nlh->nlmsg_flags & NLM_F_EXCL)
4517 return -EEXIST;
4518
4519 return 0;
4520 }
4521
4522 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4523
4524 type = nft_obj_type_get(objtype);
4525 if (IS_ERR(type))
4526 return PTR_ERR(type);
4527
84fba055 4528 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4529 if (IS_ERR(obj)) {
4530 err = PTR_ERR(obj);
4531 goto err1;
4532 }
18965317 4533 obj->table = table;
61509575
PS		 4534 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4535 if (!obj->name) {
4536 err = -ENOMEM;
4537 goto err2;
4538 }
e5009240
PNA		 4539
4540 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4541 if (err < 0)
61509575 4542 goto err3;
e5009240
PNA		 4543
4544 list_add_tail_rcu(&obj->list, &table->objects);
4545 table->use++;
4546 return 0;
61509575
PS		 4547err3:
4548 kfree(obj->name);
e5009240 4549err2:
dfc46034
PBG		 4550 if (obj->ops->destroy)
4551 obj->ops->destroy(obj);
e5009240
PNA		 4552 kfree(obj);
4553err1:
4554 module_put(type->owner);
4555 return err;
4556}
4557
4558static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4559 u32 portid, u32 seq, int event, u32 flags,
4560 int family, const struct nft_table *table,
43da04a5 4561 struct nft_object *obj, bool reset)
e5009240
PNA		 4562{
4563 struct nfgenmsg *nfmsg;
4564 struct nlmsghdr *nlh;
4565
dedb67c4 4566 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 4567 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4568 if (nlh == NULL)
4569 goto nla_put_failure;
4570
4571 nfmsg = nlmsg_data(nlh);
4572 nfmsg->nfgen_family = family;
4573 nfmsg->version = NFNETLINK_V0;
4574 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4575
4576 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4577 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
dfc46034 4578 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 4579 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4580 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4581 goto nla_put_failure;
4582
4583 nlmsg_end(skb, nlh);
4584 return 0;
4585
4586nla_put_failure:
4587 nlmsg_trim(skb, nlh);
4588 return -1;
4589}
4590
a9fea2a3 4591struct nft_obj_filter {
e46abbcc 4592 char *table;
a9fea2a3
PNA		 4593 u32 type;
4594};
4595
e5009240
PNA		 4596static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4597{
4598 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4599 const struct nft_af_info *afi;
4600 const struct nft_table *table;
e5009240 4601 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4602 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4603 struct net *net = sock_net(skb->sk);
4604 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4605 struct nft_object *obj;
4606 bool reset = false;
4607
4608 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4609 reset = true;
e5009240
PNA		 4610
4611 rcu_read_lock();
4612 cb->seq = net->nft.base_seq;
4613
4614 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4615 if (family != NFPROTO_UNSPEC && family != afi->family)
4616 continue;
4617
4618 list_for_each_entry_rcu(table, &afi->tables, list) {
4619 list_for_each_entry_rcu(obj, &table->objects, list) {
4620 if (!nft_is_active(net, obj))
4621 goto cont;
4622 if (idx < s_idx)
4623 goto cont;
4624 if (idx > s_idx)
4625 memset(&cb->args[1], 0,
4626 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4627 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4628 strcmp(filter->table, table->name))
4629 goto cont;
d21e540b
LZ		 4630 if (filter &&
4631 filter->type != NFT_OBJECT_UNSPEC &&
dfc46034 4632 obj->ops->type->type != filter->type)
a9fea2a3
PNA		 4633 goto cont;
4634
e5009240
PNA		 4635 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4636 cb->nlh->nlmsg_seq,
4637 NFT_MSG_NEWOBJ,
4638 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4639 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4640 goto done;
4641
4642 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4643cont:
4644 idx++;
4645 }
4646 }
4647 }
4648done:
4649 rcu_read_unlock();
4650
4651 cb->args[0] = idx;
4652 return skb->len;
4653}
4654
a9fea2a3
PNA		 4655static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4656{
e46abbcc
PS		 4657 struct nft_obj_filter *filter = cb->data;
4658
4659 kfree(filter->table);
4660 kfree(filter);
a9fea2a3
PNA		 4661
4662 return 0;
4663}
4664
4665static struct nft_obj_filter *
4666nft_obj_filter_alloc(const struct nlattr * const nla[])
4667{
4668 struct nft_obj_filter *filter;
4669
4670 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4671 if (!filter)
4672 return ERR_PTR(-ENOMEM);
4673
e46abbcc
PS		 4674 if (nla[NFTA_OBJ_TABLE]) {
4675 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4676 if (!filter->table) {
4677 kfree(filter);
4678 return ERR_PTR(-ENOMEM);
4679 }
4680 }
a9fea2a3
PNA		 4681 if (nla[NFTA_OBJ_TYPE])
4682 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4683
4684 return filter;
4685}
4686
e5009240
PNA		 4687static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4688 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4689 const struct nlattr * const nla[],
4690 struct netlink_ext_ack *extack)
e5009240
PNA		 4691{
4692 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4693 u8 genmask = nft_genmask_cur(net);
4694 int family = nfmsg->nfgen_family;
4695 const struct nft_af_info *afi;
4696 const struct nft_table *table;
4697 struct nft_object *obj;
4698 struct sk_buff *skb2;
43da04a5 4699 bool reset = false;
e5009240
PNA		 4700 u32 objtype;
4701 int err;
4702
4703 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4704 struct netlink_dump_control c = {
4705 .dump = nf_tables_dump_obj,
a9fea2a3 4706 .done = nf_tables_dump_obj_done,
e5009240 4707 };
a9fea2a3
PNA		 4708
4709 if (nla[NFTA_OBJ_TABLE] ||
4710 nla[NFTA_OBJ_TYPE]) {
4711 struct nft_obj_filter *filter;
4712
4713 filter = nft_obj_filter_alloc(nla);
4714 if (IS_ERR(filter))
4715 return -ENOMEM;
4716
4717 c.data = filter;
4718 }
e5009240
PNA		 4719 return netlink_dump_start(nlsk, skb, nlh, &c);
4720 }
4721
4722 if (!nla[NFTA_OBJ_NAME] ||
4723 !nla[NFTA_OBJ_TYPE])
4724 return -EINVAL;
4725
4726 afi = nf_tables_afinfo_lookup(net, family, false);
4727 if (IS_ERR(afi))
4728 return PTR_ERR(afi);
4729
4730 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4731 if (IS_ERR(table))
4732 return PTR_ERR(table);
4733
4734 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4735 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4736 if (IS_ERR(obj))
4737 return PTR_ERR(obj);
4738
4739 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4740 if (!skb2)
4741 return -ENOMEM;
4742
43da04a5
PNA		 4743 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4744 reset = true;
4745
e5009240
PNA		 4746 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4747 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4748 family, table, obj, reset);
e5009240
PNA		 4749 if (err < 0)
4750 goto err;
4751
4752 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4753err:
4754 kfree_skb(skb2);
4755 return err;
e5009240
PNA		 4756}
4757
4758static void nft_obj_destroy(struct nft_object *obj)
4759{
dfc46034
PBG		 4760 if (obj->ops->destroy)
4761 obj->ops->destroy(obj);
e5009240 4762
dfc46034 4763 module_put(obj->ops->type->owner);
61509575 4764 kfree(obj->name);
e5009240
PNA		 4765 kfree(obj);
4766}
4767
4768static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 4769 struct sk_buff *skb, const struct nlmsghdr *nlh,
4770 const struct nlattr * const nla[],
4771 struct netlink_ext_ack *extack)
e5009240
PNA		 4772{
4773 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4774 u8 genmask = nft_genmask_next(net);
4775 int family = nfmsg->nfgen_family;
4776 struct nft_af_info *afi;
4777 struct nft_table *table;
4778 struct nft_object *obj;
4779 struct nft_ctx ctx;
4780 u32 objtype;
4781
4782 if (!nla[NFTA_OBJ_TYPE] ||
4783 !nla[NFTA_OBJ_NAME])
4784 return -EINVAL;
4785
4786 afi = nf_tables_afinfo_lookup(net, family, true);
4787 if (IS_ERR(afi))
4788 return PTR_ERR(afi);
4789
4790 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4791 if (IS_ERR(table))
4792 return PTR_ERR(table);
4793
4794 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4795 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4796 if (IS_ERR(obj))
4797 return PTR_ERR(obj);
4798 if (obj->use > 0)
4799 return -EBUSY;
4800
4801 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4802
4803 return nft_delobj(&ctx, obj);
4804}
4805
25e94a99
PNA		 4806void nft_obj_notify(struct net *net, struct nft_table *table,
4807 struct nft_object *obj, u32 portid, u32 seq, int event,
4808 int family, int report, gfp_t gfp)
e5009240
PNA		 4809{
4810 struct sk_buff *skb;
4811 int err;
4812
2599e989
PNA		 4813 if (!report &&
4814 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4815 return;
e5009240 4816
2599e989 4817 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4818 if (skb == NULL)
4819 goto err;
4820
2599e989
PNA		 4821 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4822 table, obj, false);
e5009240
PNA		 4823 if (err < 0) {
4824 kfree_skb(skb);
4825 goto err;
4826 }
4827
25e94a99
PNA		 4828 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4829 return;
e5009240 4830err:
25e94a99 4831 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 4832}
2599e989
PNA		 4833EXPORT_SYMBOL_GPL(nft_obj_notify);
4834
25e94a99
PNA		 4835static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4836 struct nft_object *obj, int event)
2599e989 4837{
25e94a99
PNA		 4838 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4839 ctx->afi->family, ctx->report, GFP_KERNEL);
2599e989 4840}
e5009240 4841
84d7fce6
PNA		 4842static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4843 u32 portid, u32 seq)
4844{
4845 struct nlmsghdr *nlh;
4846 struct nfgenmsg *nfmsg;
784b4e61 4847 char buf[TASK_COMM_LEN];
dedb67c4 4848 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 4849
4850 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4851 if (nlh == NULL)
4852 goto nla_put_failure;
4853
4854 nfmsg = nlmsg_data(nlh);
4855 nfmsg->nfgen_family = AF_UNSPEC;
4856 nfmsg->version = NFNETLINK_V0;
4857 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4858
784b4e61
PS		 4859 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
4860 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
4861 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 4862 goto nla_put_failure;
4863
053c095a
JB		 4864 nlmsg_end(skb, nlh);
4865 return 0;
84d7fce6
PNA		 4866
4867nla_put_failure:
4868 nlmsg_trim(skb, nlh);
4869 return -EMSGSIZE;
4870}
4871
25e94a99
PNA		 4872static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4873 int event)
84d7fce6
PNA		 4874{
4875 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4876 struct sk_buff *skb2;
4877 int err;
4878
4879 if (nlmsg_report(nlh) &&
4880 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4881 return;
84d7fce6 4882
84d7fce6
PNA		 4883 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4884 if (skb2 == NULL)
4885 goto err;
4886
4887 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4888 nlh->nlmsg_seq);
4889 if (err < 0) {
4890 kfree_skb(skb2);
4891 goto err;
4892 }
4893
25e94a99
PNA		 4894 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4895 nlmsg_report(nlh), GFP_KERNEL);
4896 return;
84d7fce6 4897err:
25e94a99
PNA		 4898 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4899 -ENOBUFS);
84d7fce6
PNA		 4900}
4901
7b8002a1
PNA		 4902static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4903 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4904 const struct nlattr * const nla[],
4905 struct netlink_ext_ack *extack)
84d7fce6 4906{
84d7fce6
PNA		 4907 struct sk_buff *skb2;
4908 int err;
4909
4910 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4911 if (skb2 == NULL)
4912 return -ENOMEM;
4913
4914 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4915 nlh->nlmsg_seq);
4916 if (err < 0)
4917 goto err;
4918
4919 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4920err:
4921 kfree_skb(skb2);
4922 return err;
4923}
4924
96518518
PM		 4925static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4926 [NFT_MSG_NEWTABLE] = {
55dd6f93 4927 .call_batch = nf_tables_newtable,
96518518
PM		 4928 .attr_count = NFTA_TABLE_MAX,
4929 .policy = nft_table_policy,
4930 },
4931 [NFT_MSG_GETTABLE] = {
4932 .call = nf_tables_gettable,
4933 .attr_count = NFTA_TABLE_MAX,
4934 .policy = nft_table_policy,
4935 },
4936 [NFT_MSG_DELTABLE] = {
55dd6f93 4937 .call_batch = nf_tables_deltable,
96518518
PM		 4938 .attr_count = NFTA_TABLE_MAX,
4939 .policy = nft_table_policy,
4940 },
4941 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4942 .call_batch = nf_tables_newchain,
96518518
PM		 4943 .attr_count = NFTA_CHAIN_MAX,
4944 .policy = nft_chain_policy,
4945 },
4946 [NFT_MSG_GETCHAIN] = {
4947 .call = nf_tables_getchain,
4948 .attr_count = NFTA_CHAIN_MAX,
4949 .policy = nft_chain_policy,
4950 },
4951 [NFT_MSG_DELCHAIN] = {
91c7b38d 4952 .call_batch = nf_tables_delchain,
96518518
PM		 4953 .attr_count = NFTA_CHAIN_MAX,
4954 .policy = nft_chain_policy,
4955 },
4956 [NFT_MSG_NEWRULE] = {
0628b123 4957 .call_batch = nf_tables_newrule,
96518518
PM		 4958 .attr_count = NFTA_RULE_MAX,
4959 .policy = nft_rule_policy,
4960 },
4961 [NFT_MSG_GETRULE] = {
4962 .call = nf_tables_getrule,
4963 .attr_count = NFTA_RULE_MAX,
4964 .policy = nft_rule_policy,
4965 },
4966 [NFT_MSG_DELRULE] = {
0628b123 4967 .call_batch = nf_tables_delrule,
96518518
PM		 4968 .attr_count = NFTA_RULE_MAX,
4969 .policy = nft_rule_policy,
4970 },
20a69341 4971 [NFT_MSG_NEWSET] = {
958bee14 4972 .call_batch = nf_tables_newset,
20a69341
PM		 4973 .attr_count = NFTA_SET_MAX,
4974 .policy = nft_set_policy,
4975 },
4976 [NFT_MSG_GETSET] = {
4977 .call = nf_tables_getset,
4978 .attr_count = NFTA_SET_MAX,
4979 .policy = nft_set_policy,
4980 },
4981 [NFT_MSG_DELSET] = {
958bee14 4982 .call_batch = nf_tables_delset,
20a69341
PM		 4983 .attr_count = NFTA_SET_MAX,
4984 .policy = nft_set_policy,
4985 },
4986 [NFT_MSG_NEWSETELEM] = {
958bee14 4987 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4988 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4989 .policy = nft_set_elem_list_policy,
4990 },
4991 [NFT_MSG_GETSETELEM] = {
4992 .call = nf_tables_getsetelem,
4993 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4994 .policy = nft_set_elem_list_policy,
4995 },
4996 [NFT_MSG_DELSETELEM] = {
958bee14 4997 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4998 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4999 .policy = nft_set_elem_list_policy,
5000 },
84d7fce6
PNA		 5001 [NFT_MSG_GETGEN] = {
5002 .call = nf_tables_getgen,
5003 },
e5009240
PNA		 5004 [NFT_MSG_NEWOBJ] = {
5005 .call_batch = nf_tables_newobj,
5006 .attr_count = NFTA_OBJ_MAX,
5007 .policy = nft_obj_policy,
5008 },
5009 [NFT_MSG_GETOBJ] = {
5010 .call = nf_tables_getobj,
5011 .attr_count = NFTA_OBJ_MAX,
5012 .policy = nft_obj_policy,
5013 },
5014 [NFT_MSG_DELOBJ] = {
5015 .call_batch = nf_tables_delobj,
5016 .attr_count = NFTA_OBJ_MAX,
5017 .policy = nft_obj_policy,
5018 },
43da04a5
PNA		 5019 [NFT_MSG_GETOBJ_RESET] = {
5020 .call = nf_tables_getobj,
5021 .attr_count = NFTA_OBJ_MAX,
5022 .policy = nft_obj_policy,
5023 },
96518518
PM		 5024};
5025
91c7b38d
PNA		 5026static void nft_chain_commit_update(struct nft_trans *trans)
5027{
5028 struct nft_base_chain *basechain;
5029
b7263e07 5030 if (nft_trans_chain_name(trans))
91c7b38d
PNA		 5031 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
5032
f323d954 5033 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 5034 return;
5035
5036 basechain = nft_base_chain(trans->ctx.chain);
5037 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
5038
5039 switch (nft_trans_chain_policy(trans)) {
5040 case NF_DROP:
5041 case NF_ACCEPT:
5042 basechain->policy = nft_trans_chain_policy(trans);
5043 break;
5044 }
5045}
5046
b326dd37 5047static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 5048{
c7c32e72
PNA		 5049 switch (trans->msg_type) {
5050 case NFT_MSG_DELTABLE:
5051 nf_tables_table_destroy(&trans->ctx);
5052 break;
5053 case NFT_MSG_DELCHAIN:
5054 nf_tables_chain_destroy(trans->ctx.chain);
5055 break;
5056 case NFT_MSG_DELRULE:
5057 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5058 break;
5059 case NFT_MSG_DELSET:
5060 nft_set_destroy(nft_trans_set(trans));
5061 break;
61edafbb 5062 case NFT_MSG_DELSETELEM:
59105446
PNA		 5063 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
5064 nft_trans_elem(trans).priv);
61edafbb 5065 break;
e5009240
PNA		 5066 case NFT_MSG_DELOBJ:
5067 nft_obj_destroy(nft_trans_obj(trans));
5068 break;
c7c32e72
PNA		 5069 }
5070 kfree(trans);
5071}
5072
5913beaf 5073static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 5074{
37082f93 5075 struct nft_trans *trans, *next;
a3716e70 5076 struct nft_trans_elem *te;
37082f93
PNA		 5077
5078 /* Bump generation counter, invalidate any dump in progress */
38e029f1 5079 while (++net->nft.base_seq == 0);
37082f93
PNA		 5080
5081 /* A new generation has just started */
ea4bd995 5082 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 5083
5084 /* Make sure all packets have left the previous generation before
5085 * purging old rules.
5086 */
5087 synchronize_rcu();
5088
5089 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 5090 switch (trans->msg_type) {
55dd6f93
PNA		 5091 case NFT_MSG_NEWTABLE:
5092 if (nft_trans_table_update(trans)) {
5093 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 5094 nf_tables_table_disable(net,
5095 trans->ctx.afi,
55dd6f93
PNA		 5096 trans->ctx.table);
5097 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5098 }
5099 } else {
f2a6d766 5100 nft_clear(net, trans->ctx.table);
55dd6f93 5101 }
35151d84 5102 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 5103 nft_trans_destroy(trans);
5104 break;
5105 case NFT_MSG_DELTABLE:
f2a6d766 5106 list_del_rcu(&trans->ctx.table->list);
35151d84 5107 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 5108 break;
91c7b38d
PNA		 5109 case NFT_MSG_NEWCHAIN:
5110 if (nft_trans_chain_update(trans))
5111 nft_chain_commit_update(trans);
4fefee57 5112 else
664b0f8c 5113 nft_clear(net, trans->ctx.chain);
4fefee57 5114
35151d84 5115 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 5116 nft_trans_destroy(trans);
5117 break;
5118 case NFT_MSG_DELCHAIN:
664b0f8c 5119 list_del_rcu(&trans->ctx.chain->list);
35151d84 5120 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 5121 nf_tables_unregister_hook(trans->ctx.net,
5122 trans->ctx.table,
5123 trans->ctx.chain);
91c7b38d 5124 break;
b380e5c7 5125 case NFT_MSG_NEWRULE:
889f7ee7 5126 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 5127 nf_tables_rule_notify(&trans->ctx,
37082f93 5128 nft_trans_rule(trans),
35151d84 5129 NFT_MSG_NEWRULE);
37082f93 5130 nft_trans_destroy(trans);
b380e5c7
PNA		 5131 break;
5132 case NFT_MSG_DELRULE:
5133 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 5134 nf_tables_rule_notify(&trans->ctx,
5135 nft_trans_rule(trans),
5136 NFT_MSG_DELRULE);
b380e5c7 5137 break;
958bee14 5138 case NFT_MSG_NEWSET:
37a9cc52 5139 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 5140 /* This avoids hitting -EBUSY when deleting the table
5141 * from the transaction.
5142 */
408070d6 5143 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 5144 !list_empty(&nft_trans_set(trans)->bindings))
5145 trans->ctx.table->use--;
5146
958bee14 5147 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 5148 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 5149 nft_trans_destroy(trans);
5150 break;
5151 case NFT_MSG_DELSET:
37a9cc52 5152 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 5153 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 5154 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 5155 break;
60319eb1 5156 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 5157 te = (struct nft_trans_elem *)trans->data;
5158
42a55769 5159 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 5160 nf_tables_setelem_notify(&trans->ctx, te->set,
5161 &te->elem,
60319eb1
PNA		 5162 NFT_MSG_NEWSETELEM, 0);
5163 nft_trans_destroy(trans);
5164 break;
5165 case NFT_MSG_DELSETELEM:
a3716e70 5166 te = (struct nft_trans_elem *)trans->data;
fe2811eb 5167
a3716e70
PNA		 5168 nf_tables_setelem_notify(&trans->ctx, te->set,
5169 &te->elem,
60319eb1 5170 NFT_MSG_DELSETELEM, 0);
5cb82a38 5171 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 5172 atomic_dec(&te->set->nelems);
5173 te->set->ndeact--;
60319eb1 5174 break;
e5009240
PNA		 5175 case NFT_MSG_NEWOBJ:
5176 nft_clear(net, nft_trans_obj(trans));
5177 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5178 NFT_MSG_NEWOBJ);
5179 nft_trans_destroy(trans);
5180 break;
5181 case NFT_MSG_DELOBJ:
5182 list_del_rcu(&nft_trans_obj(trans)->list);
5183 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5184 NFT_MSG_DELOBJ);
5185 break;
37082f93 5186 }
37082f93
PNA		 5187 }
5188
b326dd37
PNA		 5189 synchronize_rcu();
5190
37082f93 5191 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 5192 list_del(&trans->list);
b326dd37 5193 nf_tables_commit_release(trans);
37082f93 5194 }
84d7fce6
PNA		 5195
5196 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 5197
5198 return 0;
5199}
5200
b326dd37 5201static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 5202{
c7c32e72
PNA		 5203 switch (trans->msg_type) {
5204 case NFT_MSG_NEWTABLE:
5205 nf_tables_table_destroy(&trans->ctx);
5206 break;
5207 case NFT_MSG_NEWCHAIN:
5208 nf_tables_chain_destroy(trans->ctx.chain);
5209 break;
5210 case NFT_MSG_NEWRULE:
5211 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5212 break;
5213 case NFT_MSG_NEWSET:
5214 nft_set_destroy(nft_trans_set(trans));
5215 break;
61edafbb
PM		 5216 case NFT_MSG_NEWSETELEM:
5217 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 5218 nft_trans_elem(trans).priv, true);
61edafbb 5219 break;
e5009240
PNA		 5220 case NFT_MSG_NEWOBJ:
5221 nft_obj_destroy(nft_trans_obj(trans));
5222 break;
c7c32e72
PNA		 5223 }
5224 kfree(trans);
5225}
5226
5913beaf 5227static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 5228{
37082f93 5229 struct nft_trans *trans, *next;
02263db0 5230 struct nft_trans_elem *te;
37082f93 5231
a907e36d
XL		 5232 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5233 list) {
b380e5c7 5234 switch (trans->msg_type) {
55dd6f93
PNA		 5235 case NFT_MSG_NEWTABLE:
5236 if (nft_trans_table_update(trans)) {
5237 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 5238 nf_tables_table_disable(net,
5239 trans->ctx.afi,
55dd6f93
PNA		 5240 trans->ctx.table);
5241 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5242 }
5243 nft_trans_destroy(trans);
5244 } else {
e688a7f8 5245 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 5246 }
5247 break;
5248 case NFT_MSG_DELTABLE:
f2a6d766 5249 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 5250 nft_trans_destroy(trans);
5251 break;
91c7b38d
PNA		 5252 case NFT_MSG_NEWCHAIN:
5253 if (nft_trans_chain_update(trans)) {
982f4051 5254 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 5255
5256 nft_trans_destroy(trans);
5257 } else {
4fefee57 5258 trans->ctx.table->use--;
e688a7f8 5259 list_del_rcu(&trans->ctx.chain->list);
c974a3a3
PNA		 5260 nf_tables_unregister_hook(trans->ctx.net,
5261 trans->ctx.table,
5262 trans->ctx.chain);
91c7b38d
PNA		 5263 }
5264 break;
5265 case NFT_MSG_DELCHAIN:
4fefee57 5266 trans->ctx.table->use++;
664b0f8c 5267 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 5268 nft_trans_destroy(trans);
5269 break;
b380e5c7 5270 case NFT_MSG_NEWRULE:
4fefee57 5271 trans->ctx.chain->use--;
b380e5c7
PNA		 5272 list_del_rcu(&nft_trans_rule(trans)->list);
5273 break;
5274 case NFT_MSG_DELRULE:
4fefee57 5275 trans->ctx.chain->use++;
889f7ee7 5276 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 5277 nft_trans_destroy(trans);
b380e5c7 5278 break;
958bee14 5279 case NFT_MSG_NEWSET:
4fefee57 5280 trans->ctx.table->use--;
e688a7f8 5281 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 5282 break;
5283 case NFT_MSG_DELSET:
4fefee57 5284 trans->ctx.table->use++;
37a9cc52 5285 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 5286 nft_trans_destroy(trans);
5287 break;
60319eb1 5288 case NFT_MSG_NEWSETELEM:
02263db0 5289 te = (struct nft_trans_elem *)trans->data;
fe2811eb 5290
5cb82a38 5291 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 5292 atomic_dec(&te->set->nelems);
60319eb1
PNA		 5293 break;
5294 case NFT_MSG_DELSETELEM:
cc02e457
PM		 5295 te = (struct nft_trans_elem *)trans->data;
5296
59105446 5297 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 5298 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 5299 te->set->ndeact--;
cc02e457 5300
e5009240
PNA		 5301 nft_trans_destroy(trans);
5302 break;
5303 case NFT_MSG_NEWOBJ:
5304 trans->ctx.table->use--;
5305 list_del_rcu(&nft_trans_obj(trans)->list);
5306 break;
5307 case NFT_MSG_DELOBJ:
5308 trans->ctx.table->use++;
5309 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 5310 nft_trans_destroy(trans);
5311 break;
37082f93 5312 }
37082f93
PNA		 5313 }
5314
b326dd37
PNA		 5315 synchronize_rcu();
5316
a1cee076
PNA		 5317 list_for_each_entry_safe_reverse(trans, next,
5318 &net->nft.commit_list, list) {
c7c32e72 5319 list_del(&trans->list);
b326dd37 5320 nf_tables_abort_release(trans);
37082f93
PNA		 5321 }
5322
5323 return 0;
5324}
5325
74e8bcd2
PNA		 5326static bool nf_tables_valid_genid(struct net *net, u32 genid)
5327{
5328 return net->nft.base_seq == genid;
5329}
5330
96518518
PM		 5331static const struct nfnetlink_subsystem nf_tables_subsys = {
5332 .name = "nf_tables",
5333 .subsys_id = NFNL_SUBSYS_NFTABLES,
5334 .cb_count = NFT_MSG_MAX,
5335 .cb = nf_tables_cb,
0628b123
PNA		 5336 .commit = nf_tables_commit,
5337 .abort = nf_tables_abort,
74e8bcd2 5338 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5339};
5340
7210e4e3
PNA		 5341int nft_chain_validate_dependency(const struct nft_chain *chain,
5342 enum nft_chain_type type)
5343{
5344 const struct nft_base_chain *basechain;
5345
f323d954 5346 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 5347 basechain = nft_base_chain(chain);
5348 if (basechain->type->type != type)
5349 return -EOPNOTSUPP;
5350 }
5351 return 0;
5352}
5353EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5354
75e8d06d
PNA		 5355int nft_chain_validate_hooks(const struct nft_chain *chain,
5356 unsigned int hook_flags)
5357{
5358 struct nft_base_chain *basechain;
5359
f323d954 5360 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 5361 basechain = nft_base_chain(chain);
5362
c974a3a3 5363 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 5364 return 0;
5365
5366 return -EOPNOTSUPP;
5367 }
5368
5369 return 0;
5370}
5371EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5372
20a69341
PM		 5373/*
5374 * Loop detection - walk through the ruleset beginning at the destination chain
5375 * of a new jump until either the source chain is reached (loop) or all
5376 * reachable chains have been traversed.
5377 *
5378 * The loop check is performed whenever a new jump verdict is added to an
5379 * expression or verdict map or a verdict map is bound to a new chain.
5380 */
5381
5382static int nf_tables_check_loops(const struct nft_ctx *ctx,
5383 const struct nft_chain *chain);
5384
5385static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5386 struct nft_set *set,
20a69341 5387 const struct nft_set_iter *iter,
de70185d 5388 struct nft_set_elem *elem)
20a69341 5389{
fe2811eb
PM		 5390 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5391 const struct nft_data *data;
5392
5393 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5394 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5395 return 0;
5396
fe2811eb 5397 data = nft_set_ext_data(ext);
1ca2e170 5398 switch (data->verdict.code) {
20a69341
PM		 5399 case NFT_JUMP:
5400 case NFT_GOTO:
1ca2e170 5401 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5402 default:
5403 return 0;
5404 }
5405}
5406
5407static int nf_tables_check_loops(const struct nft_ctx *ctx,
5408 const struct nft_chain *chain)
5409{
5410 const struct nft_rule *rule;
5411 const struct nft_expr *expr, *last;
de70185d 5412 struct nft_set *set;
20a69341
PM		 5413 struct nft_set_binding *binding;
5414 struct nft_set_iter iter;
20a69341
PM		 5415
5416 if (ctx->chain == chain)
5417 return -ELOOP;
5418
5419 list_for_each_entry(rule, &chain->rules, list) {
5420 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5421 const struct nft_data *data = NULL;
5422 int err;
5423
5424 if (!expr->ops->validate)
20a69341
PM		 5425 continue;
5426
0ca743a5
PNA		 5427 err = expr->ops->validate(ctx, expr, &data);
5428 if (err < 0)
5429 return err;
5430
20a69341 5431 if (data == NULL)
0ca743a5 5432 continue;
20a69341 5433
1ca2e170 5434 switch (data->verdict.code) {
20a69341
PM		 5435 case NFT_JUMP:
5436 case NFT_GOTO:
1ca2e170
PM		 5437 err = nf_tables_check_loops(ctx,
5438 data->verdict.chain);
20a69341
PM		 5439 if (err < 0)
5440 return err;
5441 default:
5442 break;
5443 }
5444 }
5445 }
5446
5447 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5448 if (!nft_is_active_next(ctx->net, set))
5449 continue;
20a69341
PM		 5450 if (!(set->flags & NFT_SET_MAP) ||
5451 set->dtype != NFT_DATA_VERDICT)
5452 continue;
5453
5454 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5455 if (!(binding->flags & NFT_SET_MAP) ||
5456 binding->chain != chain)
20a69341
PM		 5457 continue;
5458
8588ac09 5459 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5460 iter.skip = 0;
5461 iter.count = 0;
5462 iter.err = 0;
5463 iter.fn = nf_tables_loop_check_setelem;
5464
5465 set->ops->walk(ctx, set, &iter);
5466 if (iter.err < 0)
5467 return iter.err;
5468 }
5469 }
5470
5471 return 0;
5472}
5473
36b701fa
LGL		 5474/**
5475 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5476 *
5477 * @attr: netlink attribute to fetch value from
5478 * @max: maximum value to be stored in dest
5479 * @dest: pointer to the variable
5480 *
5481 * Parse, check and store a given u32 netlink attribute into variable.
5482 * This function returns -ERANGE if the value goes over maximum value.
5483 * Otherwise a 0 is returned and the attribute value is stored in the
5484 * destination variable.
5485 */
f1d505bb 5486int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5487{
09525a09 5488 u32 val;
36b701fa
LGL		 5489
5490 val = ntohl(nla_get_be32(attr));
5491 if (val > max)
5492 return -ERANGE;
5493
5494 *dest = val;
5495 return 0;
5496}
5497EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5498
49499c3e
PM		 5499/**
5500 * nft_parse_register - parse a register value from a netlink attribute
5501 *
5502 * @attr: netlink attribute
5503 *
5504 * Parse and translate a register value from a netlink attribute.
5505 * Registers used to be 128 bit wide, these register numbers will be
5506 * mapped to the corresponding 32 bit register numbers.
5507 */
b1c96ed3
PM		 5508unsigned int nft_parse_register(const struct nlattr *attr)
5509{
49499c3e
PM		 5510 unsigned int reg;
5511
5512 reg = ntohl(nla_get_be32(attr));
5513 switch (reg) {
5514 case NFT_REG_VERDICT...NFT_REG_4:
5515 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5516 default:
5517 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5518 }
b1c96ed3
PM		 5519}
5520EXPORT_SYMBOL_GPL(nft_parse_register);
5521
49499c3e
PM		 5522/**
5523 * nft_dump_register - dump a register value to a netlink attribute
5524 *
5525 * @skb: socket buffer
5526 * @attr: attribute number
5527 * @reg: register number
5528 *
5529 * Construct a netlink attribute containing the register number. For
5530 * compatibility reasons, register numbers being a multiple of 4 are
5531 * translated to the corresponding 128 bit register numbers.
5532 */
b1c96ed3
PM		 5533int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5534{
49499c3e
PM		 5535 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5536 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5537 else
5538 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5539
b1c96ed3
PM		 5540 return nla_put_be32(skb, attr, htonl(reg));
5541}
5542EXPORT_SYMBOL_GPL(nft_dump_register);
5543
96518518 5544/**
d07db988 5545 * nft_validate_register_load - validate a load from a register
96518518
PM		 5546 *
5547 * @reg: the register number
d07db988 5548 * @len: the length of the data
96518518
PM		 5549 *
5550 * Validate that the input register is one of the general purpose
d07db988 5551 * registers and that the length of the load is within the bounds.
96518518 5552 */
d07db988 5553int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5554{
49499c3e 5555 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5556 return -EINVAL;
d07db988
PM		 5557 if (len == 0)
5558 return -EINVAL;
49499c3e 5559 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5560 return -ERANGE;
49499c3e 5561
96518518
PM		 5562 return 0;
5563}
d07db988 5564EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5565
96518518 5566/**
1ec10212 5567 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5568 *
5569 * @ctx: context of the expression performing the load
5570 * @reg: the destination register number
5571 * @data: the data to load
5572 * @type: the data type
45d9bcda 5573 * @len: the length of the data
96518518
PM		 5574 *
5575 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5576 * the destination register and the length is within the bounds.
5577 * A value of NULL for the data means that its runtime gathered
58f40ab6 5578 * data.
96518518 5579 */
1ec10212
PM		 5580int nft_validate_register_store(const struct nft_ctx *ctx,
5581 enum nft_registers reg,
5582 const struct nft_data *data,
5583 enum nft_data_types type, unsigned int len)
96518518 5584{
20a69341
PM		 5585 int err;
5586
96518518
PM		 5587 switch (reg) {
5588 case NFT_REG_VERDICT:
58f40ab6 5589 if (type != NFT_DATA_VERDICT)
96518518 5590 return -EINVAL;
20a69341 5591
58f40ab6 5592 if (data != NULL &&
1ca2e170
PM		 5593 (data->verdict.code == NFT_GOTO ||
5594 data->verdict.code == NFT_JUMP)) {
5595 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5596 if (err < 0)
5597 return err;
5598
1ca2e170
PM		 5599 if (ctx->chain->level + 1 >
5600 data->verdict.chain->level) {
20a69341
PM		 5601 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5602 return -EMLINK;
1ca2e170 5603 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5604 }
5605 }
5606
96518518
PM		 5607 return 0;
5608 default:
49499c3e 5609 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5610 return -EINVAL;
45d9bcda
PM		 5611 if (len == 0)
5612 return -EINVAL;
49499c3e
PM		 5613 if (reg * NFT_REG32_SIZE + len >
5614 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5615 return -ERANGE;
27e6d201 5616
96518518
PM		 5617 if (data != NULL && type != NFT_DATA_VALUE)
5618 return -EINVAL;
5619 return 0;
5620 }
5621}
1ec10212 5622EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5623
5624static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5625 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5626 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5627 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5628};
5629
5630static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5631 struct nft_data_desc *desc, const struct nlattr *nla)
5632{
664b0f8c 5633 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5634 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5635 struct nft_chain *chain;
5636 int err;
5637
fceb6435
JB		 5638 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5639 NULL);
96518518
PM		 5640 if (err < 0)
5641 return err;
5642
5643 if (!tb[NFTA_VERDICT_CODE])
5644 return -EINVAL;
1ca2e170 5645 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5646
1ca2e170 5647 switch (data->verdict.code) {
e0abdadc 5648 default:
1ca2e170 5649 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5650 case NF_ACCEPT:
5651 case NF_DROP:
5652 case NF_QUEUE:
5653 break;
5654 default:
5655 return -EINVAL;
5656 }
5657 /* fall through */
96518518
PM		 5658 case NFT_CONTINUE:
5659 case NFT_BREAK:
5660 case NFT_RETURN:
96518518
PM		 5661 break;
5662 case NFT_JUMP:
5663 case NFT_GOTO:
5664 if (!tb[NFTA_VERDICT_CHAIN])
5665 return -EINVAL;
5666 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5667 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5668 if (IS_ERR(chain))
5669 return PTR_ERR(chain);
f323d954 5670 if (nft_is_base_chain(chain))
96518518
PM		 5671 return -EOPNOTSUPP;
5672
96518518 5673 chain->use++;
1ca2e170 5674 data->verdict.chain = chain;
96518518 5675 break;
96518518
PM		 5676 }
5677
4c4ed074 5678 desc->len = sizeof(data->verdict);
96518518
PM		 5679 desc->type = NFT_DATA_VERDICT;
5680 return 0;
5681}
5682
5683static void nft_verdict_uninit(const struct nft_data *data)
5684{
1ca2e170 5685 switch (data->verdict.code) {
96518518
PM		 5686 case NFT_JUMP:
5687 case NFT_GOTO:
1ca2e170 5688 data->verdict.chain->use--;
96518518
PM		 5689 break;
5690 }
5691}
5692
33d5a7b1 5693int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5694{
5695 struct nlattr *nest;
5696
33d5a7b1 5697 nest = nla_nest_start(skb, type);
96518518
PM		 5698 if (!nest)
5699 goto nla_put_failure;
5700
33d5a7b1 5701 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5702 goto nla_put_failure;
5703
33d5a7b1 5704 switch (v->code) {
96518518
PM		 5705 case NFT_JUMP:
5706 case NFT_GOTO:
1ca2e170 5707 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5708 v->chain->name))
96518518
PM		 5709 goto nla_put_failure;
5710 }
5711 nla_nest_end(skb, nest);
5712 return 0;
5713
5714nla_put_failure:
5715 return -1;
5716}
5717
d0a11fc3
PM		 5718static int nft_value_init(const struct nft_ctx *ctx,
5719 struct nft_data *data, unsigned int size,
96518518
PM		 5720 struct nft_data_desc *desc, const struct nlattr *nla)
5721{
5722 unsigned int len;
5723
5724 len = nla_len(nla);
5725 if (len == 0)
5726 return -EINVAL;
d0a11fc3 5727 if (len > size)
96518518
PM		 5728 return -EOVERFLOW;
5729
d0a11fc3 5730 nla_memcpy(data->data, nla, len);
96518518
PM		 5731 desc->type = NFT_DATA_VALUE;
5732 desc->len = len;
5733 return 0;
5734}
5735
5736static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5737 unsigned int len)
5738{
5739 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5740}
5741
5742static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5743 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5744 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5745};
5746
5747/**
5748 * nft_data_init - parse nf_tables data netlink attributes
5749 *
5750 * @ctx: context of the expression using the data
5751 * @data: destination struct nft_data
d0a11fc3 5752 * @size: maximum data length
96518518
PM		 5753 * @desc: data description
5754 * @nla: netlink attribute containing data
5755 *
5756 * Parse the netlink data attributes and initialize a struct nft_data.
5757 * The type and length of data are returned in the data description.
5758 *
5759 * The caller can indicate that it only wants to accept data of type
5760 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5761 */
d0a11fc3
PM		 5762int nft_data_init(const struct nft_ctx *ctx,
5763 struct nft_data *data, unsigned int size,
96518518
PM		 5764 struct nft_data_desc *desc, const struct nlattr *nla)
5765{
5766 struct nlattr *tb[NFTA_DATA_MAX + 1];
5767 int err;
5768
fceb6435 5769 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 5770 if (err < 0)
5771 return err;
5772
5773 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5774 return nft_value_init(ctx, data, size, desc,
5775 tb[NFTA_DATA_VALUE]);
96518518
PM		 5776 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5777 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5778 return -EINVAL;
5779}
5780EXPORT_SYMBOL_GPL(nft_data_init);
5781
5782/**
59105446 5783 * nft_data_release - release a nft_data item
96518518
PM		 5784 *
5785 * @data: struct nft_data to release
5786 * @type: type of data
5787 *
5788 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5789 * all others need to be released by calling this function.
5790 */
59105446 5791void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 5792{
960bd2c2 5793 if (type < NFT_DATA_VERDICT)
96518518 5794 return;
960bd2c2 5795 switch (type) {
96518518
PM		 5796 case NFT_DATA_VERDICT:
5797 return nft_verdict_uninit(data);
5798 default:
5799 WARN_ON(1);
5800 }
5801}
59105446 5802EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 5803
5804int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5805 enum nft_data_types type, unsigned int len)
5806{
5807 struct nlattr *nest;
5808 int err;
5809
5810 nest = nla_nest_start(skb, attr);
5811 if (nest == NULL)
5812 return -1;
5813
5814 switch (type) {
5815 case NFT_DATA_VALUE:
5816 err = nft_value_dump(skb, data, len);
5817 break;
5818 case NFT_DATA_VERDICT:
33d5a7b1 5819 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5820 break;
5821 default:
5822 err = -EINVAL;
5823 WARN_ON(1);
5824 }
5825
5826 nla_nest_end(skb, nest);
5827 return err;
5828}
5829EXPORT_SYMBOL_GPL(nft_data_dump);
5830
df05ef87 5831static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5832{
5833 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5834 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5835 net->nft.base_seq = 1;
99633ab2
PNA		 5836 return 0;
5837}
5838
613d0776
VA		 5839static void __net_exit nf_tables_exit_net(struct net *net)
5840{
5841 WARN_ON_ONCE(!list_empty(&net->nft.af_info));
5842 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
5843}
5844
5ebe0b0e
PNA		 5845int __nft_release_basechain(struct nft_ctx *ctx)
5846{
5847 struct nft_rule *rule, *nr;
5848
f323d954 5849 BUG_ON(!nft_is_base_chain(ctx->chain));
5ebe0b0e 5850
c974a3a3 5851 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 5852 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5853 list_del(&rule->list);
5854 ctx->chain->use--;
5855 nf_tables_rule_destroy(ctx, rule);
5856 }
5857 list_del(&ctx->chain->list);
5858 ctx->table->use--;
5859 nf_tables_chain_destroy(ctx->chain);
5860
5861 return 0;
5862}
5863EXPORT_SYMBOL_GPL(__nft_release_basechain);
5864
df05ef87
PNA		 5865/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5866static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5867{
5868 struct nft_table *table, *nt;
5869 struct nft_chain *chain, *nc;
e5009240 5870 struct nft_object *obj, *ne;
df05ef87
PNA		 5871 struct nft_rule *rule, *nr;
5872 struct nft_set *set, *ns;
5873 struct nft_ctx ctx = {
5874 .net = net,
5875 .afi = afi,
5876 };
5877
5878 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5879 list_for_each_entry(chain, &table->chains, list)
c974a3a3 5880 nf_tables_unregister_hook(net, table, chain);
df05ef87
PNA		 5881 /* No packets are walking on these chains anymore. */
5882 ctx.table = table;
5883 list_for_each_entry(chain, &table->chains, list) {
5884 ctx.chain = chain;
5885 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5886 list_del(&rule->list);
5887 chain->use--;
5888 nf_tables_rule_destroy(&ctx, rule);
5889 }
5890 }
5891 list_for_each_entry_safe(set, ns, &table->sets, list) {
5892 list_del(&set->list);
5893 table->use--;
5894 nft_set_destroy(set);
5895 }
e5009240
PNA		 5896 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5897 list_del(&obj->list);
5898 table->use--;
5899 nft_obj_destroy(obj);
5900 }
df05ef87
PNA		 5901 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5902 list_del(&chain->list);
5903 table->use--;
5904 nf_tables_chain_destroy(chain);
5905 }
5906 list_del(&table->list);
5907 nf_tables_table_destroy(&ctx);
5908 }
5909}
5910
99633ab2
PNA		 5911static struct pernet_operations nf_tables_net_ops = {
5912 .init = nf_tables_init_net,
613d0776 5913 .exit = nf_tables_exit_net,
99633ab2
PNA		 5914};
5915
96518518
PM		 5916static int __init nf_tables_module_init(void)
5917{
5918 int err;
5919
5920 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5921 GFP_KERNEL);
5922 if (info == NULL) {
5923 err = -ENOMEM;
5924 goto err1;
5925 }
5926
5927 err = nf_tables_core_module_init();
5928 if (err < 0)
5929 goto err2;
5930
5931 err = nfnetlink_subsys_register(&nf_tables_subsys);
5932 if (err < 0)
5933 goto err3;
5934
5935 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5936 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5937err3:
5938 nf_tables_core_module_exit();
5939err2:
5940 kfree(info);
5941err1:
5942 return err;
5943}
5944
5945static void __exit nf_tables_module_exit(void)
5946{
99633ab2 5947 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5948 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5949 rcu_barrier();
96518518
PM		 5950 nf_tables_core_module_exit();
5951 kfree(info);
5952}
5953
5954module_init(nf_tables_module_init);
5955module_exit(nf_tables_module_exit);
5956
5957MODULE_LICENSE("GPL");
5958MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5959MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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