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netfilter: constify arg to is_dying/confirmed
[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>
16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_tables_core.h>
20#include <net/netfilter/nf_tables.h>
99633ab2 21#include <net/net_namespace.h>
96518518
PM		 22#include <net/sock.h>
23
96518518
PM		 24static LIST_HEAD(nf_tables_expressions);
25
26/**
27 * nft_register_afinfo - register nf_tables address family info
28 *
29 * @afi: address family info to register
30 *
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
33 */
99633ab2 34int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 35{
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
40 return 0;
41}
42EXPORT_SYMBOL_GPL(nft_register_afinfo);
43
df05ef87
PNA		 44static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
45
96518518
PM		 46/**
47 * nft_unregister_afinfo - unregister nf_tables address family info
48 *
49 * @afi: address family info to unregister
50 *
51 * Unregister the address family for use with nf_tables.
52 */
df05ef87 53void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 54{
55 nfnl_lock(NFNL_SUBSYS_NFTABLES);
df05ef87 56 __nft_release_afinfo(net, afi);
e688a7f8 57 list_del_rcu(&afi->list);
96518518
PM		 58 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
59}
60EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
61
99633ab2 62static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 63{
64 struct nft_af_info *afi;
65
99633ab2 66 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 67 if (afi->family == family)
68 return afi;
69 }
70 return NULL;
71}
72
99633ab2
PNA		 73static struct nft_af_info *
74nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 75{
76 struct nft_af_info *afi;
77
99633ab2 78 afi = nft_afinfo_lookup(net, family);
96518518
PM		 79 if (afi != NULL)
80 return afi;
81#ifdef CONFIG_MODULES
82 if (autoload) {
83 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
84 request_module("nft-afinfo-%u", family);
85 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 86 afi = nft_afinfo_lookup(net, family);
96518518
PM		 87 if (afi != NULL)
88 return ERR_PTR(-EAGAIN);
89 }
90#endif
91 return ERR_PTR(-EAFNOSUPPORT);
92}
93
7c95f6d8 94static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 95 struct net *net,
7c95f6d8
PNA		 96 const struct sk_buff *skb,
97 const struct nlmsghdr *nlh,
98 struct nft_af_info *afi,
99 struct nft_table *table,
100 struct nft_chain *chain,
101 const struct nlattr * const *nla)
102{
633c9a84 103 ctx->net = net;
128ad332
PNA		 104 ctx->afi = afi;
105 ctx->table = table;
106 ctx->chain = chain;
107 ctx->nla = nla;
108 ctx->portid = NETLINK_CB(skb).portid;
109 ctx->report = nlmsg_report(nlh);
110 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 111}
112
b380e5c7
PNA		 113static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
114 u32 size)
1081d11b
PNA		 115{
116 struct nft_trans *trans;
117
118 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
119 if (trans == NULL)
120 return NULL;
121
b380e5c7 122 trans->msg_type = msg_type;
1081d11b
PNA		 123 trans->ctx = *ctx;
124
125 return trans;
126}
127
128static void nft_trans_destroy(struct nft_trans *trans)
129{
130 list_del(&trans->list);
131 kfree(trans);
132}
133
82bec71d
PNA		 134static int nf_tables_register_hooks(struct net *net,
135 const struct nft_table *table,
d8ee8f7c
PNA		 136 struct nft_chain *chain,
137 unsigned int hook_nops)
138{
139 if (table->flags & NFT_TABLE_F_DORMANT ||
140 !(chain->flags & NFT_BASE_CHAIN))
141 return 0;
142
82bec71d
PNA		 143 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
144 hook_nops);
d8ee8f7c
PNA		 145}
146
82bec71d
PNA		 147static void nf_tables_unregister_hooks(struct net *net,
148 const struct nft_table *table,
d8ee8f7c 149 struct nft_chain *chain,
c5598794
AB		 150 unsigned int hook_nops)
151{
d8ee8f7c
PNA		 152 if (table->flags & NFT_TABLE_F_DORMANT ||
153 !(chain->flags & NFT_BASE_CHAIN))
154 return;
155
82bec71d 156 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
c5598794
AB		 157}
158
ee01d542
AB		 159static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
160{
161 struct nft_trans *trans;
162
163 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
164 if (trans == NULL)
165 return -ENOMEM;
166
167 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 168 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 169
170 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
171 return 0;
172}
173
174static int nft_deltable(struct nft_ctx *ctx)
175{
176 int err;
177
178 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
179 if (err < 0)
180 return err;
181
f2a6d766 182 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 183 return err;
184}
185
186static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
187{
188 struct nft_trans *trans;
189
190 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
191 if (trans == NULL)
192 return -ENOMEM;
193
194 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 195 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 196
197 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
198 return 0;
199}
200
201static int nft_delchain(struct nft_ctx *ctx)
202{
203 int err;
204
205 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
206 if (err < 0)
207 return err;
208
209 ctx->table->use--;
664b0f8c 210 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542
AB		 211
212 return err;
213}
214
ee01d542
AB		 215static int
216nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
217{
218 /* You cannot delete the same rule twice */
889f7ee7
PNA		 219 if (nft_is_active_next(ctx->net, rule)) {
220 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 221 ctx->chain->use--;
222 return 0;
223 }
224 return -ENOENT;
225}
226
227static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
228 struct nft_rule *rule)
229{
230 struct nft_trans *trans;
231
232 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
233 if (trans == NULL)
234 return NULL;
235
236 nft_trans_rule(trans) = rule;
237 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
238
239 return trans;
240}
241
242static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
243{
244 struct nft_trans *trans;
245 int err;
246
247 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
248 if (trans == NULL)
249 return -ENOMEM;
250
251 err = nf_tables_delrule_deactivate(ctx, rule);
252 if (err < 0) {
253 nft_trans_destroy(trans);
254 return err;
255 }
256
257 return 0;
258}
259
260static int nft_delrule_by_chain(struct nft_ctx *ctx)
261{
262 struct nft_rule *rule;
263 int err;
264
265 list_for_each_entry(rule, &ctx->chain->rules, list) {
266 err = nft_delrule(ctx, rule);
267 if (err < 0)
268 return err;
269 }
270 return 0;
271}
272
ee01d542
AB		 273static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
274 struct nft_set *set)
275{
276 struct nft_trans *trans;
277
278 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
279 if (trans == NULL)
280 return -ENOMEM;
281
282 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
283 nft_trans_set_id(trans) =
284 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 285 nft_activate_next(ctx->net, set);
ee01d542
AB		 286 }
287 nft_trans_set(trans) = set;
288 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
289
290 return 0;
291}
292
293static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
294{
295 int err;
296
297 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
298 if (err < 0)
299 return err;
300
37a9cc52 301 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 302 ctx->table->use--;
303
304 return err;
305}
306
96518518
PM		 307/*
308 * Tables
309 */
310
311static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 312 const struct nlattr *nla,
313 u8 genmask)
96518518
PM		 314{
315 struct nft_table *table;
316
317 list_for_each_entry(table, &afi->tables, list) {
f2a6d766
PNA		 318 if (!nla_strcmp(nla, table->name) &&
319 nft_active_genmask(table, genmask))
96518518
PM		 320 return table;
321 }
322 return NULL;
323}
324
325static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 326 const struct nlattr *nla,
327 u8 genmask)
96518518
PM		 328{
329 struct nft_table *table;
330
331 if (nla == NULL)
332 return ERR_PTR(-EINVAL);
333
f2a6d766 334 table = nft_table_lookup(afi, nla, genmask);
96518518
PM		 335 if (table != NULL)
336 return table;
337
96518518
PM		 338 return ERR_PTR(-ENOENT);
339}
340
341static inline u64 nf_tables_alloc_handle(struct nft_table *table)
342{
343 return ++table->hgenerator;
344}
345
2a37d755 346static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
9370761c 347
2a37d755 348static const struct nf_chain_type *
baae3e62 349__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 350{
351 int i;
352
baae3e62 353 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 354 if (chain_type[family][i] != NULL &&
355 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 356 return chain_type[family][i];
9370761c 357 }
baae3e62 358 return NULL;
9370761c
PNA		 359}
360
2a37d755 361static const struct nf_chain_type *
baae3e62
PM		 362nf_tables_chain_type_lookup(const struct nft_af_info *afi,
363 const struct nlattr *nla,
364 bool autoload)
9370761c 365{
2a37d755 366 const struct nf_chain_type *type;
9370761c
PNA		 367
368 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 369 if (type != NULL)
370 return type;
9370761c 371#ifdef CONFIG_MODULES
93b0806f 372 if (autoload) {
9370761c 373 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 374 request_module("nft-chain-%u-%.*s", afi->family,
375 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 376 nfnl_lock(NFNL_SUBSYS_NFTABLES);
377 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 378 if (type != NULL)
379 return ERR_PTR(-EAGAIN);
9370761c
PNA		 380 }
381#endif
93b0806f 382 return ERR_PTR(-ENOENT);
9370761c
PNA		 383}
384
96518518 385static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 386 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
387 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 388 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 389};
390
84d7fce6
PNA		 391static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
392 u32 portid, u32 seq, int event, u32 flags,
393 int family, const struct nft_table *table)
96518518
PM		 394{
395 struct nlmsghdr *nlh;
396 struct nfgenmsg *nfmsg;
397
398 event |= NFNL_SUBSYS_NFTABLES << 8;
399 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
400 if (nlh == NULL)
401 goto nla_put_failure;
402
403 nfmsg = nlmsg_data(nlh);
404 nfmsg->nfgen_family = family;
405 nfmsg->version = NFNETLINK_V0;
84d7fce6 406 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 407
9ddf6323 408 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 409 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
410 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 411 goto nla_put_failure;
412
053c095a
JB		 413 nlmsg_end(skb, nlh);
414 return 0;
96518518
PM		 415
416nla_put_failure:
417 nlmsg_trim(skb, nlh);
418 return -1;
419}
420
35151d84 421static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 422{
423 struct sk_buff *skb;
96518518
PM		 424 int err;
425
128ad332
PNA		 426 if (!ctx->report &&
427 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 428 return 0;
429
430 err = -ENOBUFS;
431 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
432 if (skb == NULL)
433 goto err;
434
84d7fce6
PNA		 435 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
436 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 437 if (err < 0) {
438 kfree_skb(skb);
439 goto err;
440 }
441
128ad332
PNA		 442 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
443 ctx->report, GFP_KERNEL);
96518518 444err:
128ad332
PNA		 445 if (err < 0) {
446 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
447 err);
448 }
96518518
PM		 449 return err;
450}
451
452static int nf_tables_dump_tables(struct sk_buff *skb,
453 struct netlink_callback *cb)
454{
455 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
456 const struct nft_af_info *afi;
457 const struct nft_table *table;
458 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 459 struct net *net = sock_net(skb->sk);
96518518
PM		 460 int family = nfmsg->nfgen_family;
461
e688a7f8 462 rcu_read_lock();
38e029f1
PNA		 463 cb->seq = net->nft.base_seq;
464
e688a7f8 465 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 466 if (family != NFPROTO_UNSPEC && family != afi->family)
467 continue;
468
e688a7f8 469 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 470 if (idx < s_idx)
471 goto cont;
472 if (idx > s_idx)
473 memset(&cb->args[1], 0,
474 sizeof(cb->args) - sizeof(cb->args[0]));
f2a6d766
PNA		 475 if (!nft_is_active(net, table))
476 continue;
84d7fce6 477 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 478 NETLINK_CB(cb->skb).portid,
479 cb->nlh->nlmsg_seq,
480 NFT_MSG_NEWTABLE,
481 NLM_F_MULTI,
482 afi->family, table) < 0)
483 goto done;
38e029f1
PNA		 484
485 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 486cont:
487 idx++;
488 }
489 }
490done:
e688a7f8 491 rcu_read_unlock();
96518518
PM		 492 cb->args[0] = idx;
493 return skb->len;
494}
495
7b8002a1
PNA		 496static int nf_tables_gettable(struct net *net, struct sock *nlsk,
497 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 498 const struct nlattr * const nla[])
499{
500 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 501 u8 genmask = nft_genmask_cur(net);
96518518
PM		 502 const struct nft_af_info *afi;
503 const struct nft_table *table;
504 struct sk_buff *skb2;
505 int family = nfmsg->nfgen_family;
506 int err;
507
508 if (nlh->nlmsg_flags & NLM_F_DUMP) {
509 struct netlink_dump_control c = {
510 .dump = nf_tables_dump_tables,
511 };
512 return netlink_dump_start(nlsk, skb, nlh, &c);
513 }
514
99633ab2 515 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 516 if (IS_ERR(afi))
517 return PTR_ERR(afi);
518
f2a6d766 519 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 520 if (IS_ERR(table))
521 return PTR_ERR(table);
522
523 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
524 if (!skb2)
525 return -ENOMEM;
526
84d7fce6 527 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 528 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
529 family, table);
530 if (err < 0)
531 goto err;
532
533 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
534
535err:
536 kfree_skb(skb2);
537 return err;
538}
539
664b0f8c
PNA		 540static int nf_tables_table_enable(struct net *net,
541 const struct nft_af_info *afi,
115a60b1 542 struct nft_table *table)
9ddf6323
PNA		 543{
544 struct nft_chain *chain;
545 int err, i = 0;
546
547 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 548 if (!nft_is_active_next(net, chain))
549 continue;
d2012975
PNA		 550 if (!(chain->flags & NFT_BASE_CHAIN))
551 continue;
552
82bec71d
PNA		 553 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
554 afi->nops);
9ddf6323
PNA		 555 if (err < 0)
556 goto err;
557
558 i++;
559 }
560 return 0;
561err:
562 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 563 if (!nft_is_active_next(net, chain))
564 continue;
d2012975
PNA		 565 if (!(chain->flags & NFT_BASE_CHAIN))
566 continue;
567
9ddf6323
PNA		 568 if (i-- <= 0)
569 break;
570
82bec71d
PNA		 571 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
572 afi->nops);
9ddf6323
PNA		 573 }
574 return err;
575}
576
664b0f8c
PNA		 577static void nf_tables_table_disable(struct net *net,
578 const struct nft_af_info *afi,
d8ee8f7c 579 struct nft_table *table)
9ddf6323
PNA		 580{
581 struct nft_chain *chain;
582
d2012975 583 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 584 if (!nft_is_active_next(net, chain))
585 continue;
82bec71d
PNA		 586 if (!(chain->flags & NFT_BASE_CHAIN))
587 continue;
588
589 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
590 afi->nops);
d2012975 591 }
9ddf6323
PNA		 592}
593
e1aaca93 594static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 595{
55dd6f93 596 struct nft_trans *trans;
e1aaca93 597 u32 flags;
55dd6f93 598 int ret = 0;
9ddf6323 599
e1aaca93
PNA		 600 if (!ctx->nla[NFTA_TABLE_FLAGS])
601 return 0;
9ddf6323 602
e1aaca93
PNA		 603 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
604 if (flags & ~NFT_TABLE_F_DORMANT)
605 return -EINVAL;
606
63283dd2
PNA		 607 if (flags == ctx->table->flags)
608 return 0;
609
55dd6f93
PNA		 610 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
611 sizeof(struct nft_trans_table));
612 if (trans == NULL)
613 return -ENOMEM;
9ddf6323 614
e1aaca93
PNA		 615 if ((flags & NFT_TABLE_F_DORMANT) &&
616 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 617 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 618 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
619 ctx->table->flags & NFT_TABLE_F_DORMANT) {
664b0f8c 620 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
55dd6f93 621 if (ret >= 0) {
e1aaca93 622 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 623 nft_trans_table_enable(trans) = true;
9ddf6323 624 }
9ddf6323 625 }
e1aaca93
PNA		 626 if (ret < 0)
627 goto err;
9ddf6323 628
55dd6f93
PNA		 629 nft_trans_table_update(trans) = true;
630 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
631 return 0;
9ddf6323 632err:
55dd6f93 633 nft_trans_destroy(trans);
9ddf6323
PNA		 634 return ret;
635}
636
633c9a84
PNA		 637static int nf_tables_newtable(struct net *net, struct sock *nlsk,
638 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 639 const struct nlattr * const nla[])
640{
641 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 642 u8 genmask = nft_genmask_next(net);
96518518
PM		 643 const struct nlattr *name;
644 struct nft_af_info *afi;
645 struct nft_table *table;
646 int family = nfmsg->nfgen_family;
c5c1f975 647 u32 flags = 0;
e1aaca93 648 struct nft_ctx ctx;
55dd6f93 649 int err;
96518518 650
99633ab2 651 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 652 if (IS_ERR(afi))
653 return PTR_ERR(afi);
654
655 name = nla[NFTA_TABLE_NAME];
f2a6d766 656 table = nf_tables_table_lookup(afi, name, genmask);
96518518
PM		 657 if (IS_ERR(table)) {
658 if (PTR_ERR(table) != -ENOENT)
659 return PTR_ERR(table);
660 table = NULL;
661 }
662
663 if (table != NULL) {
664 if (nlh->nlmsg_flags & NLM_F_EXCL)
665 return -EEXIST;
666 if (nlh->nlmsg_flags & NLM_F_REPLACE)
667 return -EOPNOTSUPP;
e1aaca93 668
633c9a84 669 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 670 return nf_tables_updtable(&ctx);
96518518
PM		 671 }
672
c5c1f975
PM		 673 if (nla[NFTA_TABLE_FLAGS]) {
674 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
675 if (flags & ~NFT_TABLE_F_DORMANT)
676 return -EINVAL;
677 }
678
ebddf1a8 679 err = -EAFNOSUPPORT;
7047f9d0 680 if (!try_module_get(afi->owner))
ebddf1a8 681 goto err1;
7047f9d0 682
ffdb210e 683 err = -ENOMEM;
1cae565e 684 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 685 if (table == NULL)
ebddf1a8 686 goto err2;
96518518 687
1cae565e 688 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 689 INIT_LIST_HEAD(&table->chains);
20a69341 690 INIT_LIST_HEAD(&table->sets);
c5c1f975 691 table->flags = flags;
9ddf6323 692
633c9a84 693 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 694 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 695 if (err < 0)
ebddf1a8 696 goto err3;
ffdb210e 697
e688a7f8 698 list_add_tail_rcu(&table->list, &afi->tables);
96518518 699 return 0;
ebddf1a8 700err3:
ffdb210e 701 kfree(table);
ebddf1a8 702err2:
ffdb210e 703 module_put(afi->owner);
ebddf1a8 704err1:
ffdb210e 705 return err;
96518518
PM		 706}
707
b9ac12ef
AB		 708static int nft_flush_table(struct nft_ctx *ctx)
709{
710 int err;
711 struct nft_chain *chain, *nc;
712 struct nft_set *set, *ns;
713
a2f18db0 714 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 715 if (!nft_is_active_next(ctx->net, chain))
716 continue;
717
b9ac12ef
AB		 718 ctx->chain = chain;
719
720 err = nft_delrule_by_chain(ctx);
721 if (err < 0)
722 goto out;
b9ac12ef
AB		 723 }
724
725 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 726 if (!nft_is_active_next(ctx->net, set))
727 continue;
728
b9ac12ef
AB		 729 if (set->flags & NFT_SET_ANONYMOUS &&
730 !list_empty(&set->bindings))
731 continue;
732
733 err = nft_delset(ctx, set);
734 if (err < 0)
735 goto out;
736 }
737
a2f18db0 738 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 739 if (!nft_is_active_next(ctx->net, chain))
740 continue;
741
a2f18db0
PNA		 742 ctx->chain = chain;
743
744 err = nft_delchain(ctx);
745 if (err < 0)
746 goto out;
747 }
748
b9ac12ef
AB		 749 err = nft_deltable(ctx);
750out:
751 return err;
752}
753
754static int nft_flush(struct nft_ctx *ctx, int family)
755{
756 struct nft_af_info *afi;
757 struct nft_table *table, *nt;
758 const struct nlattr * const *nla = ctx->nla;
759 int err = 0;
760
761 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
762 if (family != AF_UNSPEC && afi->family != family)
763 continue;
764
765 ctx->afi = afi;
766 list_for_each_entry_safe(table, nt, &afi->tables, list) {
f2a6d766
PNA		 767 if (!nft_is_active_next(ctx->net, table))
768 continue;
769
b9ac12ef
AB		 770 if (nla[NFTA_TABLE_NAME] &&
771 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
772 continue;
773
774 ctx->table = table;
775
776 err = nft_flush_table(ctx);
777 if (err < 0)
778 goto out;
779 }
780 }
781out:
782 return err;
783}
784
633c9a84
PNA		 785static int nf_tables_deltable(struct net *net, struct sock *nlsk,
786 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 787 const struct nlattr * const nla[])
788{
789 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 790 u8 genmask = nft_genmask_next(net);
96518518
PM		 791 struct nft_af_info *afi;
792 struct nft_table *table;
ee01d542 793 int family = nfmsg->nfgen_family;
55dd6f93 794 struct nft_ctx ctx;
96518518 795
633c9a84 796 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 797 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
798 return nft_flush(&ctx, family);
799
99633ab2 800 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 801 if (IS_ERR(afi))
802 return PTR_ERR(afi);
803
f2a6d766 804 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 805 if (IS_ERR(table))
806 return PTR_ERR(table);
96518518 807
b9ac12ef
AB		 808 ctx.afi = afi;
809 ctx.table = table;
55dd6f93 810
b9ac12ef 811 return nft_flush_table(&ctx);
96518518
PM		 812}
813
55dd6f93
PNA		 814static void nf_tables_table_destroy(struct nft_ctx *ctx)
815{
4fefee57
PNA		 816 BUG_ON(ctx->table->use > 0);
817
55dd6f93
PNA		 818 kfree(ctx->table);
819 module_put(ctx->afi->owner);
820}
821
2a37d755 822int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 823{
9370761c 824 int err = 0;
96518518
PM		 825
826 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 827 if (chain_type[ctype->family][ctype->type] != NULL) {
828 err = -EBUSY;
829 goto out;
96518518 830 }
9370761c
PNA		 831 chain_type[ctype->family][ctype->type] = ctype;
832out:
96518518
PM		 833 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
834 return err;
835}
9370761c 836EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 837
2a37d755 838void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 839{
96518518 840 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 841 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 842 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
843}
9370761c 844EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 845
846/*
847 * Chains
848 */
849
850static struct nft_chain *
664b0f8c
PNA		 851nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
852 u8 genmask)
96518518
PM		 853{
854 struct nft_chain *chain;
855
856 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 857 if (chain->handle == handle &&
858 nft_active_genmask(chain, genmask))
96518518
PM		 859 return chain;
860 }
861
862 return ERR_PTR(-ENOENT);
863}
864
865static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
664b0f8c
PNA		 866 const struct nlattr *nla,
867 u8 genmask)
96518518
PM		 868{
869 struct nft_chain *chain;
870
871 if (nla == NULL)
872 return ERR_PTR(-EINVAL);
873
874 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 875 if (!nla_strcmp(nla, chain->name) &&
876 nft_active_genmask(chain, genmask))
96518518
PM		 877 return chain;
878 }
879
880 return ERR_PTR(-ENOENT);
881}
882
883static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
884 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
885 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
886 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
887 .len = NFT_CHAIN_MAXNAMELEN - 1 },
888 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 889 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 890 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 891 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 892};
893
894static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
895 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
896 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 897 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
898 .len = IFNAMSIZ - 1 },
96518518
PM		 899};
900
0ca743a5
PNA		 901static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
902{
903 struct nft_stats *cpu_stats, total;
904 struct nlattr *nest;
ce355e20
ED		 905 unsigned int seq;
906 u64 pkts, bytes;
0ca743a5
PNA		 907 int cpu;
908
909 memset(&total, 0, sizeof(total));
910 for_each_possible_cpu(cpu) {
911 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 912 do {
913 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
914 pkts = cpu_stats->pkts;
915 bytes = cpu_stats->bytes;
916 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
917 total.pkts += pkts;
918 total.bytes += bytes;
0ca743a5
PNA		 919 }
920 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
921 if (nest == NULL)
922 goto nla_put_failure;
923
b46f6ded
ND		 924 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
925 NFTA_COUNTER_PAD) ||
926 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
927 NFTA_COUNTER_PAD))
0ca743a5
PNA		 928 goto nla_put_failure;
929
930 nla_nest_end(skb, nest);
931 return 0;
932
933nla_put_failure:
934 return -ENOSPC;
935}
936
84d7fce6
PNA		 937static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
938 u32 portid, u32 seq, int event, u32 flags,
939 int family, const struct nft_table *table,
96518518
PM		 940 const struct nft_chain *chain)
941{
942 struct nlmsghdr *nlh;
943 struct nfgenmsg *nfmsg;
944
945 event |= NFNL_SUBSYS_NFTABLES << 8;
946 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
947 if (nlh == NULL)
948 goto nla_put_failure;
949
950 nfmsg = nlmsg_data(nlh);
951 nfmsg->nfgen_family = family;
952 nfmsg->version = NFNETLINK_V0;
84d7fce6 953 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 954
955 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
956 goto nla_put_failure;
b46f6ded
ND		 957 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
958 NFTA_CHAIN_PAD))
96518518
PM		 959 goto nla_put_failure;
960 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
961 goto nla_put_failure;
962
963 if (chain->flags & NFT_BASE_CHAIN) {
0ca743a5 964 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 965 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 966 struct nlattr *nest;
967
968 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 969 if (nest == NULL)
970 goto nla_put_failure;
971 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
972 goto nla_put_failure;
973 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
974 goto nla_put_failure;
2cbce139
PNA		 975 if (basechain->dev_name[0] &&
976 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
977 goto nla_put_failure;
96518518 978 nla_nest_end(skb, nest);
9370761c 979
0ca743a5
PNA		 980 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
981 htonl(basechain->policy)))
982 goto nla_put_failure;
983
baae3e62
PM		 984 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
985 goto nla_put_failure;
0ca743a5
PNA		 986
987 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
988 goto nla_put_failure;
96518518
PM		 989 }
990
0ca743a5
PNA		 991 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
992 goto nla_put_failure;
993
053c095a
JB		 994 nlmsg_end(skb, nlh);
995 return 0;
96518518
PM		 996
997nla_put_failure:
998 nlmsg_trim(skb, nlh);
999 return -1;
1000}
1001
35151d84 1002static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1003{
1004 struct sk_buff *skb;
96518518
PM		 1005 int err;
1006
128ad332
PNA		 1007 if (!ctx->report &&
1008 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1009 return 0;
1010
1011 err = -ENOBUFS;
1012 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1013 if (skb == NULL)
1014 goto err;
1015
84d7fce6
PNA		 1016 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1017 event, 0, ctx->afi->family, ctx->table,
35151d84 1018 ctx->chain);
96518518
PM		 1019 if (err < 0) {
1020 kfree_skb(skb);
1021 goto err;
1022 }
1023
128ad332
PNA		 1024 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1025 ctx->report, GFP_KERNEL);
96518518 1026err:
128ad332
PNA		 1027 if (err < 0) {
1028 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1029 err);
1030 }
96518518
PM		 1031 return err;
1032}
1033
1034static int nf_tables_dump_chains(struct sk_buff *skb,
1035 struct netlink_callback *cb)
1036{
1037 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1038 const struct nft_af_info *afi;
1039 const struct nft_table *table;
1040 const struct nft_chain *chain;
1041 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1042 struct net *net = sock_net(skb->sk);
96518518
PM		 1043 int family = nfmsg->nfgen_family;
1044
e688a7f8 1045 rcu_read_lock();
38e029f1
PNA		 1046 cb->seq = net->nft.base_seq;
1047
e688a7f8 1048 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1049 if (family != NFPROTO_UNSPEC && family != afi->family)
1050 continue;
1051
e688a7f8
PNA		 1052 list_for_each_entry_rcu(table, &afi->tables, list) {
1053 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1054 if (idx < s_idx)
1055 goto cont;
1056 if (idx > s_idx)
1057 memset(&cb->args[1], 0,
1058 sizeof(cb->args) - sizeof(cb->args[0]));
664b0f8c
PNA		 1059 if (!nft_is_active(net, chain))
1060 continue;
84d7fce6
PNA		 1061 if (nf_tables_fill_chain_info(skb, net,
1062 NETLINK_CB(cb->skb).portid,
96518518
PM		 1063 cb->nlh->nlmsg_seq,
1064 NFT_MSG_NEWCHAIN,
1065 NLM_F_MULTI,
1066 afi->family, table, chain) < 0)
1067 goto done;
38e029f1
PNA		 1068
1069 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1070cont:
1071 idx++;
1072 }
1073 }
1074 }
1075done:
e688a7f8 1076 rcu_read_unlock();
96518518
PM		 1077 cb->args[0] = idx;
1078 return skb->len;
1079}
1080
7b8002a1
PNA		 1081static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1082 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1083 const struct nlattr * const nla[])
1084{
1085 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1086 u8 genmask = nft_genmask_cur(net);
96518518
PM		 1087 const struct nft_af_info *afi;
1088 const struct nft_table *table;
1089 const struct nft_chain *chain;
1090 struct sk_buff *skb2;
1091 int family = nfmsg->nfgen_family;
1092 int err;
1093
1094 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1095 struct netlink_dump_control c = {
1096 .dump = nf_tables_dump_chains,
1097 };
1098 return netlink_dump_start(nlsk, skb, nlh, &c);
1099 }
1100
99633ab2 1101 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1102 if (IS_ERR(afi))
1103 return PTR_ERR(afi);
1104
f2a6d766 1105 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1106 if (IS_ERR(table))
1107 return PTR_ERR(table);
1108
664b0f8c 1109 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1110 if (IS_ERR(chain))
1111 return PTR_ERR(chain);
1112
1113 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1114 if (!skb2)
1115 return -ENOMEM;
1116
84d7fce6 1117 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1118 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1119 family, table, chain);
1120 if (err < 0)
1121 goto err;
1122
1123 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1124
1125err:
1126 kfree_skb(skb2);
1127 return err;
1128}
1129
0ca743a5
PNA		 1130static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1131 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1132 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1133};
1134
ff3cd7b3 1135static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1136{
1137 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1138 struct nft_stats __percpu *newstats;
1139 struct nft_stats *stats;
1140 int err;
1141
1142 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1143 if (err < 0)
ff3cd7b3 1144 return ERR_PTR(err);
0ca743a5
PNA		 1145
1146 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1147 return ERR_PTR(-EINVAL);
0ca743a5 1148
ce355e20 1149 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1150 if (newstats == NULL)
ff3cd7b3 1151 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1152
1153 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1154 * are not exposed to userspace.
1155 */
e8781f70 1156 preempt_disable();
0ca743a5
PNA		 1157 stats = this_cpu_ptr(newstats);
1158 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1159 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1160 preempt_enable();
0ca743a5 1161
ff3cd7b3
PNA		 1162 return newstats;
1163}
1164
1165static void nft_chain_stats_replace(struct nft_base_chain *chain,
1166 struct nft_stats __percpu *newstats)
1167{
b88825de
PNA		 1168 if (newstats == NULL)
1169 return;
1170
0ca743a5 1171 if (chain->stats) {
0ca743a5 1172 struct nft_stats __percpu *oldstats =
67a8fc27 1173 nft_dereference(chain->stats);
0ca743a5
PNA		 1174
1175 rcu_assign_pointer(chain->stats, newstats);
1176 synchronize_rcu();
1177 free_percpu(oldstats);
1178 } else
1179 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1180}
1181
91c7b38d
PNA		 1182static void nf_tables_chain_destroy(struct nft_chain *chain)
1183{
1184 BUG_ON(chain->use > 0);
1185
1186 if (chain->flags & NFT_BASE_CHAIN) {
2cbce139
PNA		 1187 struct nft_base_chain *basechain = nft_base_chain(chain);
1188
1189 module_put(basechain->type->owner);
1190 free_percpu(basechain->stats);
1191 if (basechain->ops[0].dev != NULL)
1192 dev_put(basechain->ops[0].dev);
1193 kfree(basechain);
91c7b38d
PNA		 1194 } else {
1195 kfree(chain);
1196 }
1197}
1198
633c9a84
PNA		 1199static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1200 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1201 const struct nlattr * const nla[])
1202{
1203 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1204 const struct nlattr * uninitialized_var(name);
7c95f6d8 1205 struct nft_af_info *afi;
96518518
PM		 1206 struct nft_table *table;
1207 struct nft_chain *chain;
0ca743a5 1208 struct nft_base_chain *basechain = NULL;
96518518 1209 struct nlattr *ha[NFTA_HOOK_MAX + 1];
f2a6d766 1210 u8 genmask = nft_genmask_next(net);
96518518 1211 int family = nfmsg->nfgen_family;
2cbce139 1212 struct net_device *dev = NULL;
57de2a0c 1213 u8 policy = NF_ACCEPT;
96518518 1214 u64 handle = 0;
115a60b1 1215 unsigned int i;
ff3cd7b3 1216 struct nft_stats __percpu *stats;
96518518
PM		 1217 int err;
1218 bool create;
91c7b38d 1219 struct nft_ctx ctx;
96518518
PM		 1220
1221 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1222
99633ab2 1223 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1224 if (IS_ERR(afi))
1225 return PTR_ERR(afi);
1226
f2a6d766 1227 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1228 if (IS_ERR(table))
1229 return PTR_ERR(table);
1230
96518518
PM		 1231 chain = NULL;
1232 name = nla[NFTA_CHAIN_NAME];
1233
1234 if (nla[NFTA_CHAIN_HANDLE]) {
1235 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1236 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1237 if (IS_ERR(chain))
1238 return PTR_ERR(chain);
1239 } else {
664b0f8c 1240 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1241 if (IS_ERR(chain)) {
1242 if (PTR_ERR(chain) != -ENOENT)
1243 return PTR_ERR(chain);
1244 chain = NULL;
1245 }
1246 }
1247
57de2a0c
PM		 1248 if (nla[NFTA_CHAIN_POLICY]) {
1249 if ((chain != NULL &&
d6b6cb1d
PNA		 1250 !(chain->flags & NFT_BASE_CHAIN)))
1251 return -EOPNOTSUPP;
1252
1253 if (chain == NULL &&
57de2a0c
PM		 1254 nla[NFTA_CHAIN_HOOK] == NULL)
1255 return -EOPNOTSUPP;
1256
8f46df18 1257 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1258 switch (policy) {
1259 case NF_DROP:
1260 case NF_ACCEPT:
1261 break;
1262 default:
1263 return -EINVAL;
1264 }
1265 }
1266
96518518 1267 if (chain != NULL) {
91c7b38d
PNA		 1268 struct nft_stats *stats = NULL;
1269 struct nft_trans *trans;
1270
96518518
PM		 1271 if (nlh->nlmsg_flags & NLM_F_EXCL)
1272 return -EEXIST;
1273 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1274 return -EOPNOTSUPP;
1275
664b0f8c
PNA		 1276 if (nla[NFTA_CHAIN_HANDLE] && name) {
1277 struct nft_chain *chain2;
1278
1279 chain2 = nf_tables_chain_lookup(table,
1280 nla[NFTA_CHAIN_NAME],
1281 genmask);
1282 if (IS_ERR(chain2))
1283 return PTR_ERR(chain2);
1284 }
96518518 1285
0ca743a5
PNA		 1286 if (nla[NFTA_CHAIN_COUNTERS]) {
1287 if (!(chain->flags & NFT_BASE_CHAIN))
1288 return -EOPNOTSUPP;
1289
ff3cd7b3
PNA		 1290 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1291 if (IS_ERR(stats))
1292 return PTR_ERR(stats);
0ca743a5
PNA		 1293 }
1294
633c9a84 1295 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1296 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1297 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1298 if (trans == NULL) {
1299 free_percpu(stats);
91c7b38d 1300 return -ENOMEM;
f5553c19 1301 }
4401a862 1302
91c7b38d
PNA		 1303 nft_trans_chain_stats(trans) = stats;
1304 nft_trans_chain_update(trans) = true;
4401a862 1305
91c7b38d
PNA		 1306 if (nla[NFTA_CHAIN_POLICY])
1307 nft_trans_chain_policy(trans) = policy;
1308 else
1309 nft_trans_chain_policy(trans) = -1;
96518518 1310
91c7b38d
PNA		 1311 if (nla[NFTA_CHAIN_HANDLE] && name) {
1312 nla_strlcpy(nft_trans_chain_name(trans), name,
1313 NFT_CHAIN_MAXNAMELEN);
1314 }
1315 list_add_tail(&trans->list, &net->nft.commit_list);
1316 return 0;
96518518
PM		 1317 }
1318
75820676
PM		 1319 if (table->use == UINT_MAX)
1320 return -EOVERFLOW;
1321
96518518 1322 if (nla[NFTA_CHAIN_HOOK]) {
2a37d755 1323 const struct nf_chain_type *type;
96518518 1324 struct nf_hook_ops *ops;
9370761c 1325 nf_hookfn *hookfn;
115a60b1 1326 u32 hooknum, priority;
9370761c 1327
baae3e62 1328 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
9370761c
PNA		 1329 if (nla[NFTA_CHAIN_TYPE]) {
1330 type = nf_tables_chain_type_lookup(afi,
1331 nla[NFTA_CHAIN_TYPE],
1332 create);
93b0806f
PM		 1333 if (IS_ERR(type))
1334 return PTR_ERR(type);
9370761c 1335 }
96518518
PM		 1336
1337 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1338 nft_hook_policy);
1339 if (err < 0)
1340 return err;
1341 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1342 ha[NFTA_HOOK_PRIORITY] == NULL)
1343 return -EINVAL;
9370761c
PNA		 1344
1345 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1346 if (hooknum >= afi->nhooks)
96518518 1347 return -EINVAL;
115a60b1 1348 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
96518518 1349
baae3e62 1350 if (!(type->hook_mask & (1 << hooknum)))
9370761c 1351 return -EOPNOTSUPP;
fa2c1de0 1352 if (!try_module_get(type->owner))
baae3e62 1353 return -ENOENT;
fa2c1de0 1354 hookfn = type->hooks[hooknum];
9370761c 1355
2cbce139
PNA		 1356 if (afi->flags & NFT_AF_NEEDS_DEV) {
1357 char ifname[IFNAMSIZ];
1358
1359 if (!ha[NFTA_HOOK_DEV]) {
1360 module_put(type->owner);
1361 return -EOPNOTSUPP;
1362 }
1363
1364 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1365 dev = dev_get_by_name(net, ifname);
1366 if (!dev) {
1367 module_put(type->owner);
1368 return -ENOENT;
1369 }
1370 } else if (ha[NFTA_HOOK_DEV]) {
1371 module_put(type->owner);
1372 return -EOPNOTSUPP;
1373 }
1374
96518518 1375 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19
PNA		 1376 if (basechain == NULL) {
1377 module_put(type->owner);
2cbce139
PNA		 1378 if (dev != NULL)
1379 dev_put(dev);
96518518 1380 return -ENOMEM;
f5553c19 1381 }
9370761c 1382
2cbce139
PNA		 1383 if (dev != NULL)
1384 strncpy(basechain->dev_name, dev->name, IFNAMSIZ);
1385
4401a862 1386 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1387 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1388 if (IS_ERR(stats)) {
fa2c1de0 1389 module_put(type->owner);
4401a862 1390 kfree(basechain);
2cbce139
PNA		 1391 if (dev != NULL)
1392 dev_put(dev);
ff3cd7b3 1393 return PTR_ERR(stats);
4401a862 1394 }
ff3cd7b3 1395 basechain->stats = stats;
4401a862 1396 } else {
ce355e20 1397 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1398 if (stats == NULL) {
fa2c1de0 1399 module_put(type->owner);
4401a862 1400 kfree(basechain);
2cbce139
PNA		 1401 if (dev != NULL)
1402 dev_put(dev);
c123bb71 1403 return -ENOMEM;
4401a862 1404 }
ff3cd7b3 1405 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1406 }
1407
5ebb335d 1408 write_pnet(&basechain->pnet, net);
9370761c 1409 basechain->type = type;
96518518
PM		 1410 chain = &basechain->chain;
1411
115a60b1
PM		 1412 for (i = 0; i < afi->nops; i++) {
1413 ops = &basechain->ops[i];
1414 ops->pf = family;
115a60b1
PM		 1415 ops->hooknum = hooknum;
1416 ops->priority = priority;
1417 ops->priv = chain;
1418 ops->hook = afi->hooks[ops->hooknum];
2cbce139 1419 ops->dev = dev;
115a60b1
PM		 1420 if (hookfn)
1421 ops->hook = hookfn;
1422 if (afi->hook_ops_init)
1423 afi->hook_ops_init(ops, i);
1424 }
96518518
PM		 1425
1426 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1427 basechain->policy = policy;
96518518
PM		 1428 } else {
1429 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1430 if (chain == NULL)
1431 return -ENOMEM;
1432 }
1433
1434 INIT_LIST_HEAD(&chain->rules);
1435 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1436 chain->table = table;
96518518
PM		 1437 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1438
82bec71d 1439 err = nf_tables_register_hooks(net, table, chain, afi->nops);
d8ee8f7c
PNA		 1440 if (err < 0)
1441 goto err1;
96518518 1442
633c9a84 1443 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1444 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1445 if (err < 0)
1446 goto err2;
96518518 1447
4fefee57 1448 table->use++;
e688a7f8 1449 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1450 return 0;
1451err2:
82bec71d 1452 nf_tables_unregister_hooks(net, table, chain, afi->nops);
91c7b38d
PNA		 1453err1:
1454 nf_tables_chain_destroy(chain);
1455 return err;
96518518
PM		 1456}
1457
633c9a84
PNA		 1458static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1459 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1460 const struct nlattr * const nla[])
1461{
1462 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1463 u8 genmask = nft_genmask_next(net);
7c95f6d8 1464 struct nft_af_info *afi;
96518518
PM		 1465 struct nft_table *table;
1466 struct nft_chain *chain;
1467 int family = nfmsg->nfgen_family;
91c7b38d 1468 struct nft_ctx ctx;
96518518 1469
99633ab2 1470 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1471 if (IS_ERR(afi))
1472 return PTR_ERR(afi);
1473
f2a6d766 1474 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1475 if (IS_ERR(table))
1476 return PTR_ERR(table);
1477
664b0f8c 1478 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1479 if (IS_ERR(chain))
1480 return PTR_ERR(chain);
4fefee57 1481 if (chain->use > 0)
96518518
PM		 1482 return -EBUSY;
1483
633c9a84 1484 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1485
ee01d542 1486 return nft_delchain(&ctx);
96518518
PM		 1487}
1488
96518518
PM		 1489/*
1490 * Expressions
1491 */
1492
1493/**
ef1f7df9
PM		 1494 * nft_register_expr - register nf_tables expr type
1495 * @ops: expr type
96518518 1496 *
ef1f7df9 1497 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1498 * success or a negative errno code otherwise.
1499 */
ef1f7df9 1500int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1501{
1502 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1503 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1504 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1505 else
e688a7f8 1506 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1507 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1508 return 0;
1509}
1510EXPORT_SYMBOL_GPL(nft_register_expr);
1511
1512/**
ef1f7df9
PM		 1513 * nft_unregister_expr - unregister nf_tables expr type
1514 * @ops: expr type
96518518 1515 *
ef1f7df9 1516 * Unregisters the expr typefor use with nf_tables.
96518518 1517 */
ef1f7df9 1518void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1519{
1520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1521 list_del_rcu(&type->list);
96518518
PM		 1522 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1523}
1524EXPORT_SYMBOL_GPL(nft_unregister_expr);
1525
64d46806
PM		 1526static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1527 struct nlattr *nla)
96518518 1528{
ef1f7df9 1529 const struct nft_expr_type *type;
96518518 1530
ef1f7df9 1531 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1532 if (!nla_strcmp(nla, type->name) &&
1533 (!type->family || type->family == family))
ef1f7df9 1534 return type;
96518518
PM		 1535 }
1536 return NULL;
1537}
1538
64d46806
PM		 1539static const struct nft_expr_type *nft_expr_type_get(u8 family,
1540 struct nlattr *nla)
96518518 1541{
ef1f7df9 1542 const struct nft_expr_type *type;
96518518
PM		 1543
1544 if (nla == NULL)
1545 return ERR_PTR(-EINVAL);
1546
64d46806 1547 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1548 if (type != NULL && try_module_get(type->owner))
1549 return type;
96518518
PM		 1550
1551#ifdef CONFIG_MODULES
ef1f7df9 1552 if (type == NULL) {
64d46806
PM		 1553 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1554 request_module("nft-expr-%u-%.*s", family,
1555 nla_len(nla), (char *)nla_data(nla));
1556 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1557 if (__nft_expr_type_get(family, nla))
1558 return ERR_PTR(-EAGAIN);
1559
96518518
PM		 1560 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1561 request_module("nft-expr-%.*s",
1562 nla_len(nla), (char *)nla_data(nla));
1563 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1564 if (__nft_expr_type_get(family, nla))
96518518
PM		 1565 return ERR_PTR(-EAGAIN);
1566 }
1567#endif
1568 return ERR_PTR(-ENOENT);
1569}
1570
1571static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1572 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1573 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1574};
1575
1576static int nf_tables_fill_expr_info(struct sk_buff *skb,
1577 const struct nft_expr *expr)
1578{
ef1f7df9 1579 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1580 goto nla_put_failure;
1581
1582 if (expr->ops->dump) {
1583 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1584 if (data == NULL)
1585 goto nla_put_failure;
1586 if (expr->ops->dump(skb, expr) < 0)
1587 goto nla_put_failure;
1588 nla_nest_end(skb, data);
1589 }
1590
1591 return skb->len;
1592
1593nla_put_failure:
1594 return -1;
1595};
1596
0b2d8a7b
PM		 1597int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1598 const struct nft_expr *expr)
1599{
1600 struct nlattr *nest;
1601
1602 nest = nla_nest_start(skb, attr);
1603 if (!nest)
1604 goto nla_put_failure;
1605 if (nf_tables_fill_expr_info(skb, expr) < 0)
1606 goto nla_put_failure;
1607 nla_nest_end(skb, nest);
1608 return 0;
1609
1610nla_put_failure:
1611 return -1;
1612}
1613
96518518
PM		 1614struct nft_expr_info {
1615 const struct nft_expr_ops *ops;
ef1f7df9 1616 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1617};
1618
0ca743a5
PNA		 1619static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1620 const struct nlattr *nla,
96518518
PM		 1621 struct nft_expr_info *info)
1622{
ef1f7df9 1623 const struct nft_expr_type *type;
96518518 1624 const struct nft_expr_ops *ops;
ef1f7df9 1625 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1626 int err;
1627
ef1f7df9 1628 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1629 if (err < 0)
1630 return err;
1631
64d46806 1632 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1633 if (IS_ERR(type))
1634 return PTR_ERR(type);
1635
1636 if (tb[NFTA_EXPR_DATA]) {
1637 err = nla_parse_nested(info->tb, type->maxattr,
1638 tb[NFTA_EXPR_DATA], type->policy);
1639 if (err < 0)
1640 goto err1;
1641 } else
1642 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1643
1644 if (type->select_ops != NULL) {
0ca743a5
PNA		 1645 ops = type->select_ops(ctx,
1646 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1647 if (IS_ERR(ops)) {
1648 err = PTR_ERR(ops);
1649 goto err1;
1650 }
1651 } else
1652 ops = type->ops;
1653
96518518
PM		 1654 info->ops = ops;
1655 return 0;
ef1f7df9
PM		 1656
1657err1:
1658 module_put(type->owner);
1659 return err;
96518518
PM		 1660}
1661
1662static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1663 const struct nft_expr_info *info,
96518518
PM		 1664 struct nft_expr *expr)
1665{
1666 const struct nft_expr_ops *ops = info->ops;
1667 int err;
1668
1669 expr->ops = ops;
1670 if (ops->init) {
ef1f7df9 1671 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1672 if (err < 0)
1673 goto err1;
1674 }
1675
96518518
PM		 1676 return 0;
1677
1678err1:
1679 expr->ops = NULL;
1680 return err;
1681}
1682
62472bce
PM		 1683static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1684 struct nft_expr *expr)
96518518
PM		 1685{
1686 if (expr->ops->destroy)
62472bce 1687 expr->ops->destroy(ctx, expr);
ef1f7df9 1688 module_put(expr->ops->type->owner);
96518518
PM		 1689}
1690
0b2d8a7b
PM		 1691struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1692 const struct nlattr *nla)
1693{
1694 struct nft_expr_info info;
1695 struct nft_expr *expr;
1696 int err;
1697
1698 err = nf_tables_expr_parse(ctx, nla, &info);
1699 if (err < 0)
1700 goto err1;
1701
1702 err = -ENOMEM;
1703 expr = kzalloc(info.ops->size, GFP_KERNEL);
1704 if (expr == NULL)
1705 goto err2;
1706
1707 err = nf_tables_newexpr(ctx, &info, expr);
1708 if (err < 0)
1709 goto err2;
1710
1711 return expr;
1712err2:
1713 module_put(info.ops->type->owner);
1714err1:
1715 return ERR_PTR(err);
1716}
1717
1718void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1719{
1720 nf_tables_expr_destroy(ctx, expr);
1721 kfree(expr);
1722}
1723
96518518
PM		 1724/*
1725 * Rules
1726 */
1727
1728static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1729 u64 handle)
1730{
1731 struct nft_rule *rule;
1732
1733 // FIXME: this sucks
1734 list_for_each_entry(rule, &chain->rules, list) {
1735 if (handle == rule->handle)
1736 return rule;
1737 }
1738
1739 return ERR_PTR(-ENOENT);
1740}
1741
1742static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1743 const struct nlattr *nla)
1744{
1745 if (nla == NULL)
1746 return ERR_PTR(-EINVAL);
1747
1748 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1749}
1750
1751static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1752 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1753 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1754 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1755 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1756 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1757 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1758 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1759 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1760 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1761};
1762
84d7fce6
PNA		 1763static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1764 u32 portid, u32 seq, int event,
1765 u32 flags, int family,
96518518
PM		 1766 const struct nft_table *table,
1767 const struct nft_chain *chain,
1768 const struct nft_rule *rule)
1769{
1770 struct nlmsghdr *nlh;
1771 struct nfgenmsg *nfmsg;
1772 const struct nft_expr *expr, *next;
1773 struct nlattr *list;
5e948466
EL		 1774 const struct nft_rule *prule;
1775 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1776
5e948466 1777 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1778 flags);
1779 if (nlh == NULL)
1780 goto nla_put_failure;
1781
1782 nfmsg = nlmsg_data(nlh);
1783 nfmsg->nfgen_family = family;
1784 nfmsg->version = NFNETLINK_V0;
84d7fce6 1785 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1786
1787 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1788 goto nla_put_failure;
1789 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1790 goto nla_put_failure;
b46f6ded
ND		 1791 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1792 NFTA_RULE_PAD))
96518518
PM		 1793 goto nla_put_failure;
1794
5e948466
EL		 1795 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1796 prule = list_entry(rule->list.prev, struct nft_rule, list);
1797 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1798 cpu_to_be64(prule->handle),
1799 NFTA_RULE_PAD))
5e948466
EL		 1800 goto nla_put_failure;
1801 }
1802
96518518
PM		 1803 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1804 if (list == NULL)
1805 goto nla_put_failure;
1806 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1807 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1808 goto nla_put_failure;
96518518
PM		 1809 }
1810 nla_nest_end(skb, list);
1811
86f1ec32
PM		 1812 if (rule->udata) {
1813 struct nft_userdata *udata = nft_userdata(rule);
1814 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1815 udata->data) < 0)
1816 goto nla_put_failure;
1817 }
0768b3b3 1818
053c095a
JB		 1819 nlmsg_end(skb, nlh);
1820 return 0;
96518518
PM		 1821
1822nla_put_failure:
1823 nlmsg_trim(skb, nlh);
1824 return -1;
1825}
1826
35151d84 1827static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1828 const struct nft_rule *rule,
35151d84 1829 int event)
96518518
PM		 1830{
1831 struct sk_buff *skb;
96518518
PM		 1832 int err;
1833
128ad332
PNA		 1834 if (!ctx->report &&
1835 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1836 return 0;
1837
1838 err = -ENOBUFS;
1839 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1840 if (skb == NULL)
1841 goto err;
1842
84d7fce6
PNA		 1843 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1844 event, 0, ctx->afi->family, ctx->table,
35151d84 1845 ctx->chain, rule);
96518518
PM		 1846 if (err < 0) {
1847 kfree_skb(skb);
1848 goto err;
1849 }
1850
128ad332
PNA		 1851 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1852 ctx->report, GFP_KERNEL);
96518518 1853err:
128ad332
PNA		 1854 if (err < 0) {
1855 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1856 err);
1857 }
96518518
PM		 1858 return err;
1859}
1860
1861static int nf_tables_dump_rules(struct sk_buff *skb,
1862 struct netlink_callback *cb)
1863{
1864 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1865 const struct nft_af_info *afi;
1866 const struct nft_table *table;
1867 const struct nft_chain *chain;
1868 const struct nft_rule *rule;
1869 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1870 struct net *net = sock_net(skb->sk);
96518518
PM		 1871 int family = nfmsg->nfgen_family;
1872
e688a7f8 1873 rcu_read_lock();
38e029f1
PNA		 1874 cb->seq = net->nft.base_seq;
1875
e688a7f8 1876 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1877 if (family != NFPROTO_UNSPEC && family != afi->family)
1878 continue;
1879
e688a7f8
PNA		 1880 list_for_each_entry_rcu(table, &afi->tables, list) {
1881 list_for_each_entry_rcu(chain, &table->chains, list) {
1882 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 1883 if (!nft_is_active(net, rule))
0628b123 1884 goto cont;
96518518
PM		 1885 if (idx < s_idx)
1886 goto cont;
1887 if (idx > s_idx)
1888 memset(&cb->args[1], 0,
1889 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 1890 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 1891 cb->nlh->nlmsg_seq,
1892 NFT_MSG_NEWRULE,
1893 NLM_F_MULTI | NLM_F_APPEND,
1894 afi->family, table, chain, rule) < 0)
1895 goto done;
38e029f1
PNA		 1896
1897 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1898cont:
1899 idx++;
1900 }
1901 }
1902 }
1903 }
1904done:
e688a7f8
PNA		 1905 rcu_read_unlock();
1906
96518518
PM		 1907 cb->args[0] = idx;
1908 return skb->len;
1909}
1910
7b8002a1
PNA		 1911static int nf_tables_getrule(struct net *net, struct sock *nlsk,
1912 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1913 const struct nlattr * const nla[])
1914{
1915 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1916 u8 genmask = nft_genmask_cur(net);
96518518
PM		 1917 const struct nft_af_info *afi;
1918 const struct nft_table *table;
1919 const struct nft_chain *chain;
1920 const struct nft_rule *rule;
1921 struct sk_buff *skb2;
1922 int family = nfmsg->nfgen_family;
1923 int err;
1924
1925 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1926 struct netlink_dump_control c = {
1927 .dump = nf_tables_dump_rules,
1928 };
1929 return netlink_dump_start(nlsk, skb, nlh, &c);
1930 }
1931
99633ab2 1932 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1933 if (IS_ERR(afi))
1934 return PTR_ERR(afi);
1935
f2a6d766 1936 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 1937 if (IS_ERR(table))
1938 return PTR_ERR(table);
1939
664b0f8c 1940 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 1941 if (IS_ERR(chain))
1942 return PTR_ERR(chain);
1943
1944 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1945 if (IS_ERR(rule))
1946 return PTR_ERR(rule);
1947
1948 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1949 if (!skb2)
1950 return -ENOMEM;
1951
84d7fce6 1952 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1953 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1954 family, table, chain, rule);
1955 if (err < 0)
1956 goto err;
1957
1958 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1959
1960err:
1961 kfree_skb(skb2);
1962 return err;
1963}
1964
62472bce
PM		 1965static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1966 struct nft_rule *rule)
96518518 1967{
96518518
PM		 1968 struct nft_expr *expr;
1969
1970 /*
1971 * Careful: some expressions might not be initialized in case this
1972 * is called on error from nf_tables_newrule().
1973 */
1974 expr = nft_expr_first(rule);
1975 while (expr->ops && expr != nft_expr_last(rule)) {
62472bce 1976 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 1977 expr = nft_expr_next(expr);
1978 }
1979 kfree(rule);
1980}
1981
1081d11b
PNA		 1982#define NFT_RULE_MAXEXPRS 128
1983
1984static struct nft_expr_info *info;
1985
633c9a84
PNA		 1986static int nf_tables_newrule(struct net *net, struct sock *nlsk,
1987 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1988 const struct nlattr * const nla[])
1989{
1990 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1991 u8 genmask = nft_genmask_next(net);
7c95f6d8 1992 struct nft_af_info *afi;
96518518
PM		 1993 struct nft_table *table;
1994 struct nft_chain *chain;
1995 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 1996 struct nft_userdata *udata;
1081d11b 1997 struct nft_trans *trans = NULL;
96518518
PM		 1998 struct nft_expr *expr;
1999 struct nft_ctx ctx;
2000 struct nlattr *tmp;
86f1ec32 2001 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2002 int err, rem;
2003 bool create;
5e948466 2004 u64 handle, pos_handle;
96518518
PM		 2005
2006 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2007
99633ab2 2008 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2009 if (IS_ERR(afi))
2010 return PTR_ERR(afi);
2011
f2a6d766 2012 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2013 if (IS_ERR(table))
2014 return PTR_ERR(table);
2015
664b0f8c 2016 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2017 if (IS_ERR(chain))
2018 return PTR_ERR(chain);
2019
2020 if (nla[NFTA_RULE_HANDLE]) {
2021 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2022 rule = __nf_tables_rule_lookup(chain, handle);
2023 if (IS_ERR(rule))
2024 return PTR_ERR(rule);
2025
2026 if (nlh->nlmsg_flags & NLM_F_EXCL)
2027 return -EEXIST;
2028 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2029 old_rule = rule;
2030 else
2031 return -EOPNOTSUPP;
2032 } else {
2033 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2034 return -EINVAL;
2035 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2036
2037 if (chain->use == UINT_MAX)
2038 return -EOVERFLOW;
96518518
PM		 2039 }
2040
5e948466
EL		 2041 if (nla[NFTA_RULE_POSITION]) {
2042 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2043 return -EOPNOTSUPP;
2044
2045 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2046 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2047 if (IS_ERR(old_rule))
2048 return PTR_ERR(old_rule);
2049 }
2050
633c9a84 2051 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2052
96518518
PM		 2053 n = 0;
2054 size = 0;
2055 if (nla[NFTA_RULE_EXPRESSIONS]) {
2056 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2057 err = -EINVAL;
2058 if (nla_type(tmp) != NFTA_LIST_ELEM)
2059 goto err1;
2060 if (n == NFT_RULE_MAXEXPRS)
2061 goto err1;
0ca743a5 2062 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2063 if (err < 0)
2064 goto err1;
2065 size += info[n].ops->size;
2066 n++;
2067 }
2068 }
9889840f
PM		 2069 /* Check for overflow of dlen field */
2070 err = -EFBIG;
2071 if (size >= 1 << 12)
2072 goto err1;
96518518 2073
86f1ec32 2074 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2075 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2076 if (ulen > 0)
2077 usize = sizeof(struct nft_userdata) + ulen;
2078 }
0768b3b3 2079
96518518 2080 err = -ENOMEM;
86f1ec32 2081 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2082 if (rule == NULL)
2083 goto err1;
2084
889f7ee7 2085 nft_activate_next(net, rule);
0628b123 2086
96518518
PM		 2087 rule->handle = handle;
2088 rule->dlen = size;
86f1ec32 2089 rule->udata = ulen ? 1 : 0;
0768b3b3 2090
86f1ec32
PM		 2091 if (ulen) {
2092 udata = nft_userdata(rule);
2093 udata->len = ulen - 1;
2094 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2095 }
96518518 2096
96518518
PM		 2097 expr = nft_expr_first(rule);
2098 for (i = 0; i < n; i++) {
2099 err = nf_tables_newexpr(&ctx, &info[i], expr);
2100 if (err < 0)
2101 goto err2;
ef1f7df9 2102 info[i].ops = NULL;
96518518
PM		 2103 expr = nft_expr_next(expr);
2104 }
2105
96518518 2106 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2107 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2108 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2109 old_rule);
1081d11b 2110 if (trans == NULL) {
0628b123
PNA		 2111 err = -ENOMEM;
2112 goto err2;
2113 }
889f7ee7 2114 nft_deactivate_next(net, old_rule);
ac34b861 2115 chain->use--;
5bc5c307 2116 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2117 } else {
2118 err = -ENOENT;
2119 goto err2;
2120 }
96518518 2121 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2122 if (old_rule)
2123 list_add_rcu(&rule->list, &old_rule->list);
2124 else
2125 list_add_tail_rcu(&rule->list, &chain->rules);
2126 else {
2127 if (old_rule)
2128 list_add_tail_rcu(&rule->list, &old_rule->list);
2129 else
2130 list_add_rcu(&rule->list, &chain->rules);
2131 }
96518518 2132
b380e5c7 2133 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2134 err = -ENOMEM;
2135 goto err3;
2136 }
4fefee57 2137 chain->use++;
96518518
PM		 2138 return 0;
2139
0628b123
PNA		 2140err3:
2141 list_del_rcu(&rule->list);
96518518 2142err2:
62472bce 2143 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2144err1:
2145 for (i = 0; i < n; i++) {
2146 if (info[i].ops != NULL)
ef1f7df9 2147 module_put(info[i].ops->type->owner);
96518518
PM		 2148 }
2149 return err;
2150}
2151
633c9a84
PNA		 2152static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2153 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2154 const struct nlattr * const nla[])
2155{
2156 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2157 u8 genmask = nft_genmask_next(net);
7c95f6d8 2158 struct nft_af_info *afi;
7c95f6d8 2159 struct nft_table *table;
cf9dc09d
PNA		 2160 struct nft_chain *chain = NULL;
2161 struct nft_rule *rule;
0628b123
PNA		 2162 int family = nfmsg->nfgen_family, err = 0;
2163 struct nft_ctx ctx;
96518518 2164
99633ab2 2165 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2166 if (IS_ERR(afi))
2167 return PTR_ERR(afi);
2168
f2a6d766 2169 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2170 if (IS_ERR(table))
2171 return PTR_ERR(table);
2172
cf9dc09d 2173 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2174 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2175 genmask);
cf9dc09d
PNA		 2176 if (IS_ERR(chain))
2177 return PTR_ERR(chain);
2178 }
96518518 2179
633c9a84 2180 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2181
cf9dc09d
PNA		 2182 if (chain) {
2183 if (nla[NFTA_RULE_HANDLE]) {
2184 rule = nf_tables_rule_lookup(chain,
2185 nla[NFTA_RULE_HANDLE]);
2186 if (IS_ERR(rule))
2187 return PTR_ERR(rule);
96518518 2188
5e266fe7 2189 err = nft_delrule(&ctx, rule);
cf9dc09d 2190 } else {
ce24b721 2191 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2192 }
2193 } else {
2194 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2195 if (!nft_is_active_next(net, chain))
2196 continue;
2197
cf9dc09d 2198 ctx.chain = chain;
ce24b721 2199 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2200 if (err < 0)
2201 break;
2202 }
2203 }
2204
2205 return err;
2206}
2207
20a69341
PM		 2208/*
2209 * Sets
2210 */
2211
2212static LIST_HEAD(nf_tables_set_ops);
2213
2214int nft_register_set(struct nft_set_ops *ops)
2215{
2216 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2217 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2218 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2219 return 0;
2220}
2221EXPORT_SYMBOL_GPL(nft_register_set);
2222
2223void nft_unregister_set(struct nft_set_ops *ops)
2224{
2225 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2226 list_del_rcu(&ops->list);
20a69341
PM		 2227 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2228}
2229EXPORT_SYMBOL_GPL(nft_unregister_set);
2230
c50b960c
PM		 2231/*
2232 * Select a set implementation based on the data characteristics and the
2233 * given policy. The total memory use might not be known if no size is
2234 * given, in that case the amount of memory per element is used.
2235 */
2236static const struct nft_set_ops *
2237nft_select_set_ops(const struct nlattr * const nla[],
2238 const struct nft_set_desc *desc,
2239 enum nft_set_policies policy)
20a69341 2240{
c50b960c
PM		 2241 const struct nft_set_ops *ops, *bops;
2242 struct nft_set_estimate est, best;
20a69341
PM		 2243 u32 features;
2244
2245#ifdef CONFIG_MODULES
2246 if (list_empty(&nf_tables_set_ops)) {
2247 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2248 request_module("nft-set");
2249 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2250 if (!list_empty(&nf_tables_set_ops))
2251 return ERR_PTR(-EAGAIN);
2252 }
2253#endif
2254 features = 0;
2255 if (nla[NFTA_SET_FLAGS] != NULL) {
2256 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4a8678ef 2257 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT;
20a69341
PM		 2258 }
2259
c50b960c
PM		 2260 bops = NULL;
2261 best.size = ~0;
2262 best.class = ~0;
2263
20a69341
PM		 2264 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2265 if ((ops->features & features) != features)
2266 continue;
c50b960c
PM		 2267 if (!ops->estimate(desc, features, &est))
2268 continue;
2269
2270 switch (policy) {
2271 case NFT_SET_POL_PERFORMANCE:
2272 if (est.class < best.class)
2273 break;
2274 if (est.class == best.class && est.size < best.size)
2275 break;
2276 continue;
2277 case NFT_SET_POL_MEMORY:
2278 if (est.size < best.size)
2279 break;
2280 if (est.size == best.size && est.class < best.class)
2281 break;
2282 continue;
2283 default:
2284 break;
2285 }
2286
20a69341
PM		 2287 if (!try_module_get(ops->owner))
2288 continue;
c50b960c
PM		 2289 if (bops != NULL)
2290 module_put(bops->owner);
2291
2292 bops = ops;
2293 best = est;
20a69341
PM		 2294 }
2295
c50b960c
PM		 2296 if (bops != NULL)
2297 return bops;
2298
20a69341
PM		 2299 return ERR_PTR(-EOPNOTSUPP);
2300}
2301
2302static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2303 [NFTA_SET_TABLE] = { .type = NLA_STRING },
a9bdd836 2304 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2305 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2306 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2307 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2308 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2309 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2310 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2311 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2312 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2313 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2314 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2315 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2316 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2317 .len = NFT_USERDATA_MAXLEN },
c50b960c
PM		 2318};
2319
2320static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2321 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2322};
2323
633c9a84 2324static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2325 const struct sk_buff *skb,
2326 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2327 const struct nlattr * const nla[],
2328 u8 genmask)
20a69341
PM		 2329{
2330 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2331 struct nft_af_info *afi = NULL;
2332 struct nft_table *table = NULL;
20a69341 2333
c9c8e485
PNA		 2334 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2335 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2336 if (IS_ERR(afi))
2337 return PTR_ERR(afi);
2338 }
20a69341
PM		 2339
2340 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2341 if (afi == NULL)
2342 return -EAFNOSUPPORT;
2343
f2a6d766
PNA		 2344 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2345 genmask);
20a69341
PM		 2346 if (IS_ERR(table))
2347 return PTR_ERR(table);
2348 }
2349
633c9a84 2350 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2351 return 0;
2352}
2353
2354struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
37a9cc52 2355 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2356{
2357 struct nft_set *set;
2358
2359 if (nla == NULL)
2360 return ERR_PTR(-EINVAL);
2361
2362 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2363 if (!nla_strcmp(nla, set->name) &&
2364 nft_active_genmask(set, genmask))
20a69341
PM		 2365 return set;
2366 }
2367 return ERR_PTR(-ENOENT);
2368}
2369
958bee14 2370struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
37a9cc52
PNA		 2371 const struct nlattr *nla,
2372 u8 genmask)
958bee14
PNA		 2373{
2374 struct nft_trans *trans;
2375 u32 id = ntohl(nla_get_be32(nla));
2376
2377 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2378 struct nft_set *set = nft_trans_set(trans);
2379
958bee14 2380 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2381 id == nft_trans_set_id(trans) &&
2382 nft_active_genmask(set, genmask))
2383 return set;
958bee14
PNA		 2384 }
2385 return ERR_PTR(-ENOENT);
2386}
2387
20a69341
PM		 2388static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2389 const char *name)
2390{
2391 const struct nft_set *i;
2392 const char *p;
2393 unsigned long *inuse;
60eb1894 2394 unsigned int n = 0, min = 0;
20a69341 2395
cb39ad8b 2396 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2397 if (p != NULL) {
2398 if (p[1] != 'd' || strchr(p + 2, '%'))
2399 return -EINVAL;
2400
2401 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2402 if (inuse == NULL)
2403 return -ENOMEM;
60eb1894 2404cont:
20a69341 2405 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2406 int tmp;
2407
37a9cc52
PNA		 2408 if (!nft_is_active_next(ctx->net, set))
2409 continue;
14662917 2410 if (!sscanf(i->name, name, &tmp))
20a69341 2411 continue;
60eb1894 2412 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2413 continue;
14662917 2414
60eb1894 2415 set_bit(tmp - min, inuse);
20a69341
PM		 2416 }
2417
53b70287 2418 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2419 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2420 min += BITS_PER_BYTE * PAGE_SIZE;
2421 memset(inuse, 0, PAGE_SIZE);
2422 goto cont;
2423 }
20a69341
PM		 2424 free_page((unsigned long)inuse);
2425 }
2426
60eb1894 2427 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341 2428 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2429 if (!nft_is_active_next(ctx->net, i))
2430 continue;
20a69341
PM		 2431 if (!strcmp(set->name, i->name))
2432 return -ENFILE;
2433 }
2434 return 0;
2435}
2436
2437static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2438 const struct nft_set *set, u16 event, u16 flags)
2439{
2440 struct nfgenmsg *nfmsg;
2441 struct nlmsghdr *nlh;
c50b960c 2442 struct nlattr *desc;
128ad332
PNA		 2443 u32 portid = ctx->portid;
2444 u32 seq = ctx->seq;
20a69341
PM		 2445
2446 event |= NFNL_SUBSYS_NFTABLES << 8;
2447 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2448 flags);
2449 if (nlh == NULL)
2450 goto nla_put_failure;
2451
2452 nfmsg = nlmsg_data(nlh);
2453 nfmsg->nfgen_family = ctx->afi->family;
2454 nfmsg->version = NFNETLINK_V0;
84d7fce6 2455 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2456
2457 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2458 goto nla_put_failure;
2459 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2460 goto nla_put_failure;
2461 if (set->flags != 0)
2462 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2463 goto nla_put_failure;
2464
2465 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2466 goto nla_put_failure;
2467 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2468 goto nla_put_failure;
2469 if (set->flags & NFT_SET_MAP) {
2470 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2471 goto nla_put_failure;
2472 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2473 goto nla_put_failure;
2474 }
2475
761da293 2476 if (set->timeout &&
b46f6ded
ND		 2477 nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
2478 NFTA_SET_PAD))
761da293
PM		 2479 goto nla_put_failure;
2480 if (set->gc_int &&
2481 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2482 goto nla_put_failure;
2483
9363dc4b
AB		 2484 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2485 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2486 goto nla_put_failure;
2487 }
2488
e6d8ecac
CFG		 2489 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2490 goto nla_put_failure;
2491
c50b960c
PM		 2492 desc = nla_nest_start(skb, NFTA_SET_DESC);
2493 if (desc == NULL)
2494 goto nla_put_failure;
2495 if (set->size &&
2496 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2497 goto nla_put_failure;
2498 nla_nest_end(skb, desc);
2499
053c095a
JB		 2500 nlmsg_end(skb, nlh);
2501 return 0;
20a69341
PM		 2502
2503nla_put_failure:
2504 nlmsg_trim(skb, nlh);
2505 return -1;
2506}
2507
2508static int nf_tables_set_notify(const struct nft_ctx *ctx,
2509 const struct nft_set *set,
31f8441c 2510 int event, gfp_t gfp_flags)
20a69341
PM		 2511{
2512 struct sk_buff *skb;
128ad332 2513 u32 portid = ctx->portid;
20a69341
PM		 2514 int err;
2515
128ad332
PNA		 2516 if (!ctx->report &&
2517 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2518 return 0;
2519
2520 err = -ENOBUFS;
31f8441c 2521 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2522 if (skb == NULL)
2523 goto err;
2524
2525 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2526 if (err < 0) {
2527 kfree_skb(skb);
2528 goto err;
2529 }
2530
128ad332 2531 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2532 ctx->report, gfp_flags);
20a69341
PM		 2533err:
2534 if (err < 0)
99633ab2 2535 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2536 return err;
2537}
2538
5b96af77 2539static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2540{
2541 const struct nft_set *set;
2542 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2543 struct nft_af_info *afi;
c9c8e485
PNA		 2544 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2545 struct net *net = sock_net(skb->sk);
2546 int cur_family = cb->args[3];
5b96af77 2547 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2548
2549 if (cb->args[1])
2550 return skb->len;
2551
e688a7f8 2552 rcu_read_lock();
38e029f1
PNA		 2553 cb->seq = net->nft.base_seq;
2554
e688a7f8 2555 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2556 if (ctx->afi && ctx->afi != afi)
2557 continue;
2558
c9c8e485
PNA		 2559 if (cur_family) {
2560 if (afi->family != cur_family)
2561 continue;
2562
2563 cur_family = 0;
2564 }
e688a7f8 2565 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2566 if (ctx->table && ctx->table != table)
2567 continue;
2568
c9c8e485
PNA		 2569 if (cur_table) {
2570 if (cur_table != table)
2571 continue;
2572
2573 cur_table = NULL;
2574 }
c9c8e485 2575 idx = 0;
5b96af77 2576 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2577 if (idx < s_idx)
2578 goto cont;
37a9cc52
PNA		 2579 if (!nft_is_active(net, set))
2580 goto cont;
5b96af77
PNA		 2581
2582 ctx_set = *ctx;
2583 ctx_set.table = table;
2584 ctx_set.afi = afi;
2585 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2586 NFT_MSG_NEWSET,
2587 NLM_F_MULTI) < 0) {
2588 cb->args[0] = idx;
2589 cb->args[2] = (unsigned long) table;
2590 cb->args[3] = afi->family;
2591 goto done;
2592 }
38e029f1 2593 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2594cont:
2595 idx++;
2596 }
2597 if (s_idx)
2598 s_idx = 0;
2599 }
2600 }
2601 cb->args[1] = 1;
2602done:
e688a7f8 2603 rcu_read_unlock();
c9c8e485
PNA		 2604 return skb->len;
2605}
2606
5b96af77 2607static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2608{
5b96af77
PNA		 2609 kfree(cb->data);
2610 return 0;
20a69341
PM		 2611}
2612
7b8002a1
PNA		 2613static int nf_tables_getset(struct net *net, struct sock *nlsk,
2614 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2615 const struct nlattr * const nla[])
2616{
f2a6d766 2617 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2618 const struct nft_set *set;
2619 struct nft_ctx ctx;
2620 struct sk_buff *skb2;
c9c8e485 2621 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2622 int err;
2623
01cfa0a4 2624 /* Verify existence before starting dump */
f2a6d766 2625 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2626 if (err < 0)
2627 return err;
2628
2629 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2630 struct netlink_dump_control c = {
2631 .dump = nf_tables_dump_sets,
5b96af77 2632 .done = nf_tables_dump_sets_done,
20a69341 2633 };
5b96af77
PNA		 2634 struct nft_ctx *ctx_dump;
2635
2636 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2637 if (ctx_dump == NULL)
2638 return -ENOMEM;
2639
2640 *ctx_dump = ctx;
2641 c.data = ctx_dump;
2642
20a69341
PM		 2643 return netlink_dump_start(nlsk, skb, nlh, &c);
2644 }
2645
c9c8e485
PNA		 2646 /* Only accept unspec with dump */
2647 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2648 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2649 if (!nla[NFTA_SET_TABLE])
2650 return -EINVAL;
c9c8e485 2651
37a9cc52 2652 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2653 if (IS_ERR(set))
2654 return PTR_ERR(set);
2655
2656 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2657 if (skb2 == NULL)
2658 return -ENOMEM;
2659
2660 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2661 if (err < 0)
2662 goto err;
2663
2664 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2665
2666err:
2667 kfree_skb(skb2);
2668 return err;
2669}
2670
c50b960c
PM		 2671static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2672 struct nft_set_desc *desc,
2673 const struct nlattr *nla)
2674{
2675 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2676 int err;
2677
2678 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2679 if (err < 0)
2680 return err;
2681
2682 if (da[NFTA_SET_DESC_SIZE] != NULL)
2683 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2684
2685 return 0;
2686}
2687
633c9a84
PNA		 2688static int nf_tables_newset(struct net *net, struct sock *nlsk,
2689 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2690 const struct nlattr * const nla[])
2691{
2692 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2693 u8 genmask = nft_genmask_next(net);
20a69341 2694 const struct nft_set_ops *ops;
7c95f6d8 2695 struct nft_af_info *afi;
20a69341
PM		 2696 struct nft_table *table;
2697 struct nft_set *set;
2698 struct nft_ctx ctx;
cb39ad8b 2699 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2700 unsigned int size;
2701 bool create;
761da293
PM		 2702 u64 timeout;
2703 u32 ktype, dtype, flags, policy, gc_int;
c50b960c 2704 struct nft_set_desc desc;
e6d8ecac
CFG		 2705 unsigned char *udata;
2706 u16 udlen;
20a69341
PM		 2707 int err;
2708
2709 if (nla[NFTA_SET_TABLE] == NULL ||
2710 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2711 nla[NFTA_SET_KEY_LEN] == NULL ||
2712 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2713 return -EINVAL;
2714
c50b960c
PM		 2715 memset(&desc, 0, sizeof(desc));
2716
20a69341
PM		 2717 ktype = NFT_DATA_VALUE;
2718 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2719 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2720 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2721 return -EINVAL;
2722 }
2723
c50b960c 2724 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2725 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2726 return -EINVAL;
2727
2728 flags = 0;
2729 if (nla[NFTA_SET_FLAGS] != NULL) {
2730 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2731 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95
PM		 2732 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
2733 NFT_SET_MAP | NFT_SET_EVAL))
20a69341 2734 return -EINVAL;
7c6c6e95
PM		 2735 /* Only one of both operations is supported */
2736 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL)) ==
2737 (NFT_SET_MAP | NFT_SET_EVAL))
2738 return -EOPNOTSUPP;
20a69341
PM		 2739 }
2740
2741 dtype = 0;
20a69341
PM		 2742 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2743 if (!(flags & NFT_SET_MAP))
2744 return -EINVAL;
2745
2746 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2747 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2748 dtype != NFT_DATA_VERDICT)
2749 return -EINVAL;
2750
2751 if (dtype != NFT_DATA_VERDICT) {
2752 if (nla[NFTA_SET_DATA_LEN] == NULL)
2753 return -EINVAL;
c50b960c 2754 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2755 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2756 return -EINVAL;
2757 } else
7d740264 2758 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2759 } else if (flags & NFT_SET_MAP)
2760 return -EINVAL;
2761
761da293
PM		 2762 timeout = 0;
2763 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2764 if (!(flags & NFT_SET_TIMEOUT))
2765 return -EINVAL;
2766 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
2767 }
2768 gc_int = 0;
2769 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2770 if (!(flags & NFT_SET_TIMEOUT))
2771 return -EINVAL;
2772 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2773 }
2774
c50b960c
PM		 2775 policy = NFT_SET_POL_PERFORMANCE;
2776 if (nla[NFTA_SET_POLICY] != NULL)
2777 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2778
2779 if (nla[NFTA_SET_DESC] != NULL) {
2780 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2781 if (err < 0)
2782 return err;
2783 }
2784
20a69341
PM		 2785 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2786
99633ab2 2787 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2788 if (IS_ERR(afi))
2789 return PTR_ERR(afi);
2790
f2a6d766 2791 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 2792 if (IS_ERR(table))
2793 return PTR_ERR(table);
2794
633c9a84 2795 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 2796
37a9cc52 2797 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2798 if (IS_ERR(set)) {
2799 if (PTR_ERR(set) != -ENOENT)
2800 return PTR_ERR(set);
2801 set = NULL;
2802 }
2803
2804 if (set != NULL) {
2805 if (nlh->nlmsg_flags & NLM_F_EXCL)
2806 return -EEXIST;
2807 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2808 return -EOPNOTSUPP;
2809 return 0;
2810 }
2811
2812 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2813 return -ENOENT;
2814
c50b960c 2815 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 2816 if (IS_ERR(ops))
2817 return PTR_ERR(ops);
2818
e6d8ecac
CFG		 2819 udlen = 0;
2820 if (nla[NFTA_SET_USERDATA])
2821 udlen = nla_len(nla[NFTA_SET_USERDATA]);
2822
20a69341
PM		 2823 size = 0;
2824 if (ops->privsize != NULL)
2825 size = ops->privsize(nla);
2826
2827 err = -ENOMEM;
e6d8ecac 2828 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 2829 if (set == NULL)
2830 goto err1;
2831
2832 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2833 err = nf_tables_set_alloc_name(&ctx, set, name);
2834 if (err < 0)
2835 goto err2;
2836
e6d8ecac
CFG		 2837 udata = NULL;
2838 if (udlen) {
2839 udata = set->data + size;
2840 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
2841 }
2842
20a69341 2843 INIT_LIST_HEAD(&set->bindings);
cc02e457 2844 write_pnet(&set->pnet, net);
20a69341
PM		 2845 set->ops = ops;
2846 set->ktype = ktype;
c50b960c 2847 set->klen = desc.klen;
20a69341 2848 set->dtype = dtype;
c50b960c 2849 set->dlen = desc.dlen;
20a69341 2850 set->flags = flags;
c50b960c 2851 set->size = desc.size;
9363dc4b 2852 set->policy = policy;
e6d8ecac
CFG		 2853 set->udlen = udlen;
2854 set->udata = udata;
761da293
PM		 2855 set->timeout = timeout;
2856 set->gc_int = gc_int;
20a69341 2857
c50b960c 2858 err = ops->init(set, &desc, nla);
20a69341
PM		 2859 if (err < 0)
2860 goto err2;
2861
958bee14 2862 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341
PM		 2863 if (err < 0)
2864 goto err2;
2865
e688a7f8 2866 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 2867 table->use++;
20a69341
PM		 2868 return 0;
2869
2870err2:
2871 kfree(set);
2872err1:
2873 module_put(ops->owner);
2874 return err;
2875}
2876
958bee14 2877static void nft_set_destroy(struct nft_set *set)
20a69341 2878{
20a69341
PM		 2879 set->ops->destroy(set);
2880 module_put(set->ops->owner);
2881 kfree(set);
2882}
2883
958bee14
PNA		 2884static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2885{
e688a7f8 2886 list_del_rcu(&set->list);
31f8441c 2887 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 2888 nft_set_destroy(set);
2889}
2890
633c9a84
PNA		 2891static int nf_tables_delset(struct net *net, struct sock *nlsk,
2892 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2893 const struct nlattr * const nla[])
2894{
c9c8e485 2895 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2896 u8 genmask = nft_genmask_next(net);
20a69341
PM		 2897 struct nft_set *set;
2898 struct nft_ctx ctx;
2899 int err;
2900
ec2c9935
PM		 2901 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2902 return -EAFNOSUPPORT;
20a69341
PM		 2903 if (nla[NFTA_SET_TABLE] == NULL)
2904 return -EINVAL;
2905
f2a6d766 2906 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2907 if (err < 0)
2908 return err;
2909
37a9cc52 2910 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2911 if (IS_ERR(set))
2912 return PTR_ERR(set);
2913 if (!list_empty(&set->bindings))
2914 return -EBUSY;
2915
ee01d542 2916 return nft_delset(&ctx, set);
20a69341
PM		 2917}
2918
2919static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2920 const struct nft_set *set,
2921 const struct nft_set_iter *iter,
2922 const struct nft_set_elem *elem)
2923{
fe2811eb 2924 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 2925 enum nft_registers dreg;
2926
2927 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 2928 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
2929 set->dtype == NFT_DATA_VERDICT ?
2930 NFT_DATA_VERDICT : NFT_DATA_VALUE,
2931 set->dlen);
20a69341
PM		 2932}
2933
2934int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2935 struct nft_set_binding *binding)
2936{
2937 struct nft_set_binding *i;
2938 struct nft_set_iter iter;
2939
2940 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2941 return -EBUSY;
2942
11113e19 2943 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 2944 /* If the set is already bound to the same chain all
2945 * jumps are already validated for that chain.
2946 */
2947 list_for_each_entry(i, &set->bindings, list) {
a4684402 2948 if (i->flags & NFT_SET_MAP &&
11113e19 2949 i->chain == binding->chain)
20a69341
PM		 2950 goto bind;
2951 }
2952
8588ac09 2953 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 2954 iter.skip = 0;
2955 iter.count = 0;
2956 iter.err = 0;
2957 iter.fn = nf_tables_bind_check_setelem;
2958
2959 set->ops->walk(ctx, set, &iter);
a02f4248 2960 if (iter.err < 0)
20a69341 2961 return iter.err;
20a69341
PM		 2962 }
2963bind:
2964 binding->chain = ctx->chain;
e688a7f8 2965 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 2966 return 0;
2967}
2968
2969void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2970 struct nft_set_binding *binding)
2971{
e688a7f8 2972 list_del_rcu(&binding->list);
20a69341 2973
958bee14 2974 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 2975 nft_is_active(ctx->net, set))
20a69341
PM		 2976 nf_tables_set_destroy(ctx, set);
2977}
2978
3ac4c07a
PM		 2979const struct nft_set_ext_type nft_set_ext_types[] = {
2980 [NFT_SET_EXT_KEY] = {
7d740264 2981 .align = __alignof__(u32),
3ac4c07a
PM		 2982 },
2983 [NFT_SET_EXT_DATA] = {
7d740264 2984 .align = __alignof__(u32),
3ac4c07a 2985 },
f25ad2e9
PM		 2986 [NFT_SET_EXT_EXPR] = {
2987 .align = __alignof__(struct nft_expr),
2988 },
3ac4c07a
PM		 2989 [NFT_SET_EXT_FLAGS] = {
2990 .len = sizeof(u8),
2991 .align = __alignof__(u8),
2992 },
c3e1b005
PM		 2993 [NFT_SET_EXT_TIMEOUT] = {
2994 .len = sizeof(u64),
2995 .align = __alignof__(u64),
2996 },
2997 [NFT_SET_EXT_EXPIRATION] = {
2998 .len = sizeof(unsigned long),
2999 .align = __alignof__(unsigned long),
3000 },
68e942e8
PM		 3001 [NFT_SET_EXT_USERDATA] = {
3002 .len = sizeof(struct nft_userdata),
3003 .align = __alignof__(struct nft_userdata),
3004 },
3ac4c07a
PM		 3005};
3006EXPORT_SYMBOL_GPL(nft_set_ext_types);
3007
20a69341
PM		 3008/*
3009 * Set elements
3010 */
3011
3012static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3013 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3014 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3015 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3016 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3017 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3018 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3019};
3020
3021static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3022 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
3023 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
3024 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3025 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3026};
3027
633c9a84 3028static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3029 const struct sk_buff *skb,
3030 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3031 const struct nlattr * const nla[],
3032 u8 genmask)
20a69341
PM		 3033{
3034 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3035 struct nft_af_info *afi;
3036 struct nft_table *table;
20a69341 3037
99633ab2 3038 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3039 if (IS_ERR(afi))
3040 return PTR_ERR(afi);
3041
f2a6d766
PNA		 3042 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3043 genmask);
20a69341
PM		 3044 if (IS_ERR(table))
3045 return PTR_ERR(table);
3046
633c9a84 3047 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3048 return 0;
3049}
3050
3051static int nf_tables_fill_setelem(struct sk_buff *skb,
3052 const struct nft_set *set,
3053 const struct nft_set_elem *elem)
3054{
fe2811eb 3055 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3056 unsigned char *b = skb_tail_pointer(skb);
3057 struct nlattr *nest;
3058
3059 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3060 if (nest == NULL)
3061 goto nla_put_failure;
3062
fe2811eb
PM		 3063 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3064 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3065 goto nla_put_failure;
3066
fe2811eb
PM		 3067 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3068 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3069 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3070 set->dlen) < 0)
3071 goto nla_put_failure;
3072
f25ad2e9
PM		 3073 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3074 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3075 goto nla_put_failure;
3076
fe2811eb
PM		 3077 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3078 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3079 htonl(*nft_set_ext_flags(ext))))
3080 goto nla_put_failure;
20a69341 3081
c3e1b005
PM		 3082 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3083 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
b46f6ded
ND		 3084 cpu_to_be64(*nft_set_ext_timeout(ext)),
3085 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3086 goto nla_put_failure;
3087
3088 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3089 unsigned long expires, now = jiffies;
3090
3091 expires = *nft_set_ext_expiration(ext);
3092 if (time_before(now, expires))
3093 expires -= now;
3094 else
3095 expires = 0;
3096
3097 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3098 cpu_to_be64(jiffies_to_msecs(expires)),
3099 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3100 goto nla_put_failure;
3101 }
3102
68e942e8
PM		 3103 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3104 struct nft_userdata *udata;
3105
3106 udata = nft_set_ext_userdata(ext);
3107 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3108 udata->len + 1, udata->data))
3109 goto nla_put_failure;
3110 }
3111
20a69341
PM		 3112 nla_nest_end(skb, nest);
3113 return 0;
3114
3115nla_put_failure:
3116 nlmsg_trim(skb, b);
3117 return -EMSGSIZE;
3118}
3119
3120struct nft_set_dump_args {
3121 const struct netlink_callback *cb;
3122 struct nft_set_iter iter;
3123 struct sk_buff *skb;
3124};
3125
3126static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3127 const struct nft_set *set,
3128 const struct nft_set_iter *iter,
3129 const struct nft_set_elem *elem)
3130{
3131 struct nft_set_dump_args *args;
3132
3133 args = container_of(iter, struct nft_set_dump_args, iter);
3134 return nf_tables_fill_setelem(args->skb, set, elem);
3135}
3136
3137static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3138{
633c9a84 3139 struct net *net = sock_net(skb->sk);
f2a6d766 3140 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3141 const struct nft_set *set;
3142 struct nft_set_dump_args args;
3143 struct nft_ctx ctx;
3144 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3145 struct nfgenmsg *nfmsg;
3146 struct nlmsghdr *nlh;
3147 struct nlattr *nest;
3148 u32 portid, seq;
3149 int event, err;
3150
720e0dfa
MN		 3151 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3152 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 3153 if (err < 0)
3154 return err;
3155
633c9a84 3156 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f2a6d766 3157 (void *)nla, genmask);
20a69341
PM		 3158 if (err < 0)
3159 return err;
3160
37a9cc52
PNA		 3161 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3162 genmask);
20a69341
PM		 3163 if (IS_ERR(set))
3164 return PTR_ERR(set);
3165
3166 event = NFT_MSG_NEWSETELEM;
3167 event |= NFNL_SUBSYS_NFTABLES << 8;
3168 portid = NETLINK_CB(cb->skb).portid;
3169 seq = cb->nlh->nlmsg_seq;
3170
3171 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3172 NLM_F_MULTI);
3173 if (nlh == NULL)
3174 goto nla_put_failure;
3175
3176 nfmsg = nlmsg_data(nlh);
6403d962 3177 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3178 nfmsg->version = NFNETLINK_V0;
84d7fce6 3179 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3180
3181 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3182 goto nla_put_failure;
3183 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3184 goto nla_put_failure;
3185
3186 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3187 if (nest == NULL)
3188 goto nla_put_failure;
3189
8588ac09
PNA		 3190 args.cb = cb;
3191 args.skb = skb;
3192 args.iter.genmask = nft_genmask_cur(ctx.net);
3193 args.iter.skip = cb->args[0];
3194 args.iter.count = 0;
3195 args.iter.err = 0;
3196 args.iter.fn = nf_tables_dump_setelem;
20a69341
PM		 3197 set->ops->walk(&ctx, set, &args.iter);
3198
3199 nla_nest_end(skb, nest);
3200 nlmsg_end(skb, nlh);
3201
3202 if (args.iter.err && args.iter.err != -EMSGSIZE)
3203 return args.iter.err;
3204 if (args.iter.count == cb->args[0])
3205 return 0;
3206
3207 cb->args[0] = args.iter.count;
3208 return skb->len;
3209
3210nla_put_failure:
3211 return -ENOSPC;
3212}
3213
7b8002a1
PNA		 3214static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3215 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3216 const struct nlattr * const nla[])
3217{
f2a6d766 3218 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3219 const struct nft_set *set;
3220 struct nft_ctx ctx;
3221 int err;
3222
f2a6d766 3223 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3224 if (err < 0)
3225 return err;
3226
37a9cc52
PNA		 3227 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3228 genmask);
20a69341
PM		 3229 if (IS_ERR(set))
3230 return PTR_ERR(set);
3231
3232 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3233 struct netlink_dump_control c = {
3234 .dump = nf_tables_dump_set,
3235 };
3236 return netlink_dump_start(nlsk, skb, nlh, &c);
3237 }
3238 return -EOPNOTSUPP;
3239}
3240
d60ce62f
AB		 3241static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3242 const struct nft_ctx *ctx, u32 seq,
3243 u32 portid, int event, u16 flags,
3244 const struct nft_set *set,
3245 const struct nft_set_elem *elem)
3246{
3247 struct nfgenmsg *nfmsg;
3248 struct nlmsghdr *nlh;
3249 struct nlattr *nest;
3250 int err;
3251
3252 event |= NFNL_SUBSYS_NFTABLES << 8;
3253 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3254 flags);
3255 if (nlh == NULL)
3256 goto nla_put_failure;
3257
3258 nfmsg = nlmsg_data(nlh);
3259 nfmsg->nfgen_family = ctx->afi->family;
3260 nfmsg->version = NFNETLINK_V0;
84d7fce6 3261 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3262
3263 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3264 goto nla_put_failure;
3265 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3266 goto nla_put_failure;
3267
3268 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3269 if (nest == NULL)
3270 goto nla_put_failure;
3271
3272 err = nf_tables_fill_setelem(skb, set, elem);
3273 if (err < 0)
3274 goto nla_put_failure;
3275
3276 nla_nest_end(skb, nest);
3277
053c095a
JB		 3278 nlmsg_end(skb, nlh);
3279 return 0;
d60ce62f
AB		 3280
3281nla_put_failure:
3282 nlmsg_trim(skb, nlh);
3283 return -1;
3284}
3285
3286static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3287 const struct nft_set *set,
3288 const struct nft_set_elem *elem,
3289 int event, u16 flags)
3290{
128ad332
PNA		 3291 struct net *net = ctx->net;
3292 u32 portid = ctx->portid;
d60ce62f
AB		 3293 struct sk_buff *skb;
3294 int err;
3295
128ad332 3296 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3297 return 0;
3298
3299 err = -ENOBUFS;
3300 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3301 if (skb == NULL)
3302 goto err;
3303
3304 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3305 set, elem);
3306 if (err < 0) {
3307 kfree_skb(skb);
3308 goto err;
3309 }
3310
128ad332 3311 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3312 GFP_KERNEL);
3313err:
3314 if (err < 0)
3315 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3316 return err;
3317}
3318
60319eb1
PNA		 3319static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3320 int msg_type,
3321 struct nft_set *set)
3322{
3323 struct nft_trans *trans;
3324
3325 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3326 if (trans == NULL)
3327 return NULL;
3328
3329 nft_trans_elem_set(trans) = set;
3330 return trans;
3331}
3332
22fe54d5
PM		 3333void *nft_set_elem_init(const struct nft_set *set,
3334 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3335 const u32 *key, const u32 *data,
22fe54d5 3336 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3337{
3338 struct nft_set_ext *ext;
3339 void *elem;
3340
3341 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3342 if (elem == NULL)
3343 return NULL;
3344
3345 ext = nft_set_elem_ext(set, elem);
3346 nft_set_ext_init(ext, tmpl);
3347
3348 memcpy(nft_set_ext_key(ext), key, set->klen);
3349 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3350 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3351 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3352 *nft_set_ext_expiration(ext) =
3353 jiffies + msecs_to_jiffies(timeout);
3354 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3355 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3356
3357 return elem;
3358}
3359
61edafbb
PM		 3360void nft_set_elem_destroy(const struct nft_set *set, void *elem)
3361{
3362 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3363
3364 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3365 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3366 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
f25ad2e9
PM		 3367 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3368 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
61edafbb
PM		 3369
3370 kfree(elem);
3371}
3372EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3373
0e9091d6
PNA		 3374static int nft_setelem_parse_flags(const struct nft_set *set,
3375 const struct nlattr *attr, u32 *flags)
3376{
3377 if (attr == NULL)
3378 return 0;
3379
3380 *flags = ntohl(nla_get_be32(attr));
3381 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3382 return -EINVAL;
3383 if (!(set->flags & NFT_SET_INTERVAL) &&
3384 *flags & NFT_SET_ELEM_INTERVAL_END)
3385 return -EINVAL;
3386
3387 return 0;
3388}
3389
60319eb1 3390static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3391 const struct nlattr *attr)
3392{
3393 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3394 struct nft_data_desc d1, d2;
fe2811eb
PM		 3395 struct nft_set_ext_tmpl tmpl;
3396 struct nft_set_ext *ext;
20a69341
PM		 3397 struct nft_set_elem elem;
3398 struct nft_set_binding *binding;
68e942e8 3399 struct nft_userdata *udata;
fe2811eb 3400 struct nft_data data;
20a69341 3401 enum nft_registers dreg;
60319eb1 3402 struct nft_trans *trans;
0e9091d6 3403 u32 flags = 0;
c3e1b005 3404 u64 timeout;
68e942e8 3405 u8 ulen;
20a69341
PM		 3406 int err;
3407
3408 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3409 nft_set_elem_policy);
3410 if (err < 0)
3411 return err;
3412
3413 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3414 return -EINVAL;
3415
fe2811eb
PM		 3416 nft_set_ext_prepare(&tmpl);
3417
0e9091d6
PNA		 3418 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3419 if (err < 0)
3420 return err;
3421 if (flags != 0)
3422 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3423
3424 if (set->flags & NFT_SET_MAP) {
3425 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3426 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3427 return -EINVAL;
bd7fc645 3428 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3429 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3430 return -EINVAL;
20a69341
PM		 3431 } else {
3432 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3433 return -EINVAL;
3434 }
3435
c3e1b005
PM		 3436 timeout = 0;
3437 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3438 if (!(set->flags & NFT_SET_TIMEOUT))
3439 return -EINVAL;
3440 timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
3441 } else if (set->flags & NFT_SET_TIMEOUT) {
3442 timeout = set->timeout;
3443 }
3444
7d740264 3445 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3446 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3447 if (err < 0)
3448 goto err1;
3449 err = -EINVAL;
3450 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3451 goto err2;
3452
7d740264 3453 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3454 if (timeout > 0) {
3455 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3456 if (timeout != set->timeout)
3457 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3458 }
fe2811eb 3459
20a69341 3460 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3461 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3462 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3463 if (err < 0)
3464 goto err2;
3465
3466 err = -EINVAL;
3467 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3468 goto err3;
3469
3470 dreg = nft_type_to_reg(set->dtype);
3471 list_for_each_entry(binding, &set->bindings, list) {
3472 struct nft_ctx bind_ctx = {
3473 .afi = ctx->afi,
3474 .table = ctx->table,
7c95f6d8 3475 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3476 };
3477
11113e19
PM		 3478 if (!(binding->flags & NFT_SET_MAP))
3479 continue;
3480
1ec10212
PM		 3481 err = nft_validate_register_store(&bind_ctx, dreg,
3482 &data,
3483 d2.type, d2.len);
20a69341
PM		 3484 if (err < 0)
3485 goto err3;
3486 }
fe2811eb 3487
7d740264 3488 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3489 }
3490
68e942e8
PM		 3491 /* The full maximum length of userdata can exceed the maximum
3492 * offset value (U8_MAX) for following extensions, therefor it
3493 * must be the last extension added.
3494 */
3495 ulen = 0;
3496 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3497 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3498 if (ulen > 0)
3499 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3500 ulen);
3501 }
3502
fe2811eb 3503 err = -ENOMEM;
7d740264 3504 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3505 timeout, GFP_KERNEL);
fe2811eb
PM		 3506 if (elem.priv == NULL)
3507 goto err3;
3508
3509 ext = nft_set_elem_ext(set, elem.priv);
3510 if (flags)
3511 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3512 if (ulen > 0) {
3513 udata = nft_set_ext_userdata(ext);
3514 udata->len = ulen - 1;
3515 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3516 }
fe2811eb 3517
60319eb1
PNA		 3518 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3519 if (trans == NULL)
fe2811eb 3520 goto err4;
60319eb1 3521
69086658 3522 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
20a69341
PM		 3523 err = set->ops->insert(set, &elem);
3524 if (err < 0)
fe2811eb 3525 goto err5;
20a69341 3526
60319eb1 3527 nft_trans_elem(trans) = elem;
46bbafce 3528 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3529 return 0;
3530
fe2811eb 3531err5:
60319eb1 3532 kfree(trans);
fe2811eb
PM		 3533err4:
3534 kfree(elem.priv);
20a69341
PM		 3535err3:
3536 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3537 nft_data_uninit(&data, d2.type);
20a69341 3538err2:
7d740264 3539 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3540err1:
3541 return err;
3542}
3543
633c9a84
PNA		 3544static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3545 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3546 const struct nlattr * const nla[])
3547{
f2a6d766 3548 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3549 const struct nlattr *attr;
3550 struct nft_set *set;
3551 struct nft_ctx ctx;
60319eb1 3552 int rem, err = 0;
20a69341 3553
7d5570ca
PNA		 3554 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3555 return -EINVAL;
3556
f2a6d766 3557 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3558 if (err < 0)
3559 return err;
3560
37a9cc52
PNA		 3561 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3562 genmask);
958bee14
PNA		 3563 if (IS_ERR(set)) {
3564 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3565 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3566 nla[NFTA_SET_ELEM_LIST_SET_ID],
3567 genmask);
958bee14
PNA		 3568 }
3569 if (IS_ERR(set))
3570 return PTR_ERR(set);
3571 }
3572
20a69341
PM		 3573 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3574 return -EBUSY;
3575
3576 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3dd0673a
PM		 3577 if (set->size &&
3578 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact))
3579 return -ENFILE;
3580
20a69341 3581 err = nft_add_set_elem(&ctx, set, attr);
3dd0673a
PM		 3582 if (err < 0) {
3583 atomic_dec(&set->nelems);
60319eb1 3584 break;
3dd0673a 3585 }
20a69341 3586 }
60319eb1 3587 return err;
20a69341
PM		 3588}
3589
60319eb1 3590static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3591 const struct nlattr *attr)
3592{
3593 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3594 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3595 struct nft_data_desc desc;
3596 struct nft_set_elem elem;
3971ca14 3597 struct nft_set_ext *ext;
60319eb1 3598 struct nft_trans *trans;
3971ca14
PNA		 3599 u32 flags = 0;
3600 void *priv;
20a69341
PM		 3601 int err;
3602
3603 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3604 nft_set_elem_policy);
3605 if (err < 0)
3606 goto err1;
3607
3608 err = -EINVAL;
3609 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3610 goto err1;
3611
3971ca14
PNA		 3612 nft_set_ext_prepare(&tmpl);
3613
3614 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3615 if (err < 0)
3616 return err;
3617 if (flags != 0)
3618 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3619
7d740264 3620 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3621 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3622 if (err < 0)
3623 goto err1;
3624
3625 err = -EINVAL;
3626 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3627 goto err2;
3628
3971ca14
PNA		 3629 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3630
3631 err = -ENOMEM;
3632 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3633 GFP_KERNEL);
3634 if (elem.priv == NULL)
3635 goto err2;
3636
3637 ext = nft_set_elem_ext(set, elem.priv);
3638 if (flags)
3639 *nft_set_ext_flags(ext) = flags;
3640
60319eb1 3641 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3642 if (trans == NULL) {
3643 err = -ENOMEM;
3971ca14 3644 goto err3;
609ccf08 3645 }
20a69341 3646
3971ca14
PNA		 3647 priv = set->ops->deactivate(set, &elem);
3648 if (priv == NULL) {
cc02e457 3649 err = -ENOENT;
3971ca14 3650 goto err4;
cc02e457 3651 }
3971ca14
PNA		 3652 kfree(elem.priv);
3653 elem.priv = priv;
cc02e457 3654
60319eb1 3655 nft_trans_elem(trans) = elem;
46bbafce 3656 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3657 return 0;
cc02e457 3658
3971ca14 3659err4:
cc02e457 3660 kfree(trans);
3971ca14
PNA		 3661err3:
3662 kfree(elem.priv);
20a69341 3663err2:
7d740264 3664 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3665err1:
3666 return err;
3667}
3668
633c9a84
PNA		 3669static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3670 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3671 const struct nlattr * const nla[])
3672{
f2a6d766 3673 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3674 const struct nlattr *attr;
3675 struct nft_set *set;
3676 struct nft_ctx ctx;
60319eb1 3677 int rem, err = 0;
20a69341 3678
7d5570ca
PNA		 3679 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3680 return -EINVAL;
3681
f2a6d766 3682 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3683 if (err < 0)
3684 return err;
3685
37a9cc52
PNA		 3686 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3687 genmask);
20a69341
PM		 3688 if (IS_ERR(set))
3689 return PTR_ERR(set);
3690 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3691 return -EBUSY;
3692
3693 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3694 err = nft_del_setelem(&ctx, set, attr);
3695 if (err < 0)
60319eb1 3696 break;
4fefee57 3697
3dd0673a 3698 set->ndeact++;
20a69341 3699 }
60319eb1 3700 return err;
20a69341
PM		 3701}
3702
cfed7e1b
PM		 3703void nft_set_gc_batch_release(struct rcu_head *rcu)
3704{
3705 struct nft_set_gc_batch *gcb;
3706 unsigned int i;
3707
3708 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
3709 for (i = 0; i < gcb->head.cnt; i++)
3710 nft_set_elem_destroy(gcb->head.set, gcb->elems[i]);
3711 kfree(gcb);
3712}
3713EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
3714
3715struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
3716 gfp_t gfp)
3717{
3718 struct nft_set_gc_batch *gcb;
3719
3720 gcb = kzalloc(sizeof(*gcb), gfp);
3721 if (gcb == NULL)
3722 return gcb;
3723 gcb->head.set = set;
3724 return gcb;
3725}
3726EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
3727
84d7fce6
PNA		 3728static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3729 u32 portid, u32 seq)
3730{
3731 struct nlmsghdr *nlh;
3732 struct nfgenmsg *nfmsg;
3733 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3734
3735 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3736 if (nlh == NULL)
3737 goto nla_put_failure;
3738
3739 nfmsg = nlmsg_data(nlh);
3740 nfmsg->nfgen_family = AF_UNSPEC;
3741 nfmsg->version = NFNETLINK_V0;
3742 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3743
3744 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3745 goto nla_put_failure;
3746
053c095a
JB		 3747 nlmsg_end(skb, nlh);
3748 return 0;
84d7fce6
PNA		 3749
3750nla_put_failure:
3751 nlmsg_trim(skb, nlh);
3752 return -EMSGSIZE;
3753}
3754
3755static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3756{
3757 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3758 struct sk_buff *skb2;
3759 int err;
3760
3761 if (nlmsg_report(nlh) &&
3762 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3763 return 0;
3764
3765 err = -ENOBUFS;
3766 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3767 if (skb2 == NULL)
3768 goto err;
3769
3770 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3771 nlh->nlmsg_seq);
3772 if (err < 0) {
3773 kfree_skb(skb2);
3774 goto err;
3775 }
3776
3777 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3778 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3779err:
3780 if (err < 0) {
3781 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3782 err);
3783 }
3784 return err;
3785}
3786
7b8002a1
PNA		 3787static int nf_tables_getgen(struct net *net, struct sock *nlsk,
3788 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 3789 const struct nlattr * const nla[])
3790{
84d7fce6
PNA		 3791 struct sk_buff *skb2;
3792 int err;
3793
3794 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3795 if (skb2 == NULL)
3796 return -ENOMEM;
3797
3798 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3799 nlh->nlmsg_seq);
3800 if (err < 0)
3801 goto err;
3802
3803 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3804err:
3805 kfree_skb(skb2);
3806 return err;
3807}
3808
96518518
PM		 3809static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3810 [NFT_MSG_NEWTABLE] = {
55dd6f93 3811 .call_batch = nf_tables_newtable,
96518518
PM		 3812 .attr_count = NFTA_TABLE_MAX,
3813 .policy = nft_table_policy,
3814 },
3815 [NFT_MSG_GETTABLE] = {
3816 .call = nf_tables_gettable,
3817 .attr_count = NFTA_TABLE_MAX,
3818 .policy = nft_table_policy,
3819 },
3820 [NFT_MSG_DELTABLE] = {
55dd6f93 3821 .call_batch = nf_tables_deltable,
96518518
PM		 3822 .attr_count = NFTA_TABLE_MAX,
3823 .policy = nft_table_policy,
3824 },
3825 [NFT_MSG_NEWCHAIN] = {
91c7b38d 3826 .call_batch = nf_tables_newchain,
96518518
PM		 3827 .attr_count = NFTA_CHAIN_MAX,
3828 .policy = nft_chain_policy,
3829 },
3830 [NFT_MSG_GETCHAIN] = {
3831 .call = nf_tables_getchain,
3832 .attr_count = NFTA_CHAIN_MAX,
3833 .policy = nft_chain_policy,
3834 },
3835 [NFT_MSG_DELCHAIN] = {
91c7b38d 3836 .call_batch = nf_tables_delchain,
96518518
PM		 3837 .attr_count = NFTA_CHAIN_MAX,
3838 .policy = nft_chain_policy,
3839 },
3840 [NFT_MSG_NEWRULE] = {
0628b123 3841 .call_batch = nf_tables_newrule,
96518518
PM		 3842 .attr_count = NFTA_RULE_MAX,
3843 .policy = nft_rule_policy,
3844 },
3845 [NFT_MSG_GETRULE] = {
3846 .call = nf_tables_getrule,
3847 .attr_count = NFTA_RULE_MAX,
3848 .policy = nft_rule_policy,
3849 },
3850 [NFT_MSG_DELRULE] = {
0628b123 3851 .call_batch = nf_tables_delrule,
96518518
PM		 3852 .attr_count = NFTA_RULE_MAX,
3853 .policy = nft_rule_policy,
3854 },
20a69341 3855 [NFT_MSG_NEWSET] = {
958bee14 3856 .call_batch = nf_tables_newset,
20a69341
PM		 3857 .attr_count = NFTA_SET_MAX,
3858 .policy = nft_set_policy,
3859 },
3860 [NFT_MSG_GETSET] = {
3861 .call = nf_tables_getset,
3862 .attr_count = NFTA_SET_MAX,
3863 .policy = nft_set_policy,
3864 },
3865 [NFT_MSG_DELSET] = {
958bee14 3866 .call_batch = nf_tables_delset,
20a69341
PM		 3867 .attr_count = NFTA_SET_MAX,
3868 .policy = nft_set_policy,
3869 },
3870 [NFT_MSG_NEWSETELEM] = {
958bee14 3871 .call_batch = nf_tables_newsetelem,
20a69341
PM		 3872 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3873 .policy = nft_set_elem_list_policy,
3874 },
3875 [NFT_MSG_GETSETELEM] = {
3876 .call = nf_tables_getsetelem,
3877 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3878 .policy = nft_set_elem_list_policy,
3879 },
3880 [NFT_MSG_DELSETELEM] = {
958bee14 3881 .call_batch = nf_tables_delsetelem,
20a69341
PM		 3882 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3883 .policy = nft_set_elem_list_policy,
3884 },
84d7fce6
PNA		 3885 [NFT_MSG_GETGEN] = {
3886 .call = nf_tables_getgen,
3887 },
96518518
PM		 3888};
3889
91c7b38d
PNA		 3890static void nft_chain_commit_update(struct nft_trans *trans)
3891{
3892 struct nft_base_chain *basechain;
3893
3894 if (nft_trans_chain_name(trans)[0])
3895 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3896
3897 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3898 return;
3899
3900 basechain = nft_base_chain(trans->ctx.chain);
3901 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3902
3903 switch (nft_trans_chain_policy(trans)) {
3904 case NF_DROP:
3905 case NF_ACCEPT:
3906 basechain->policy = nft_trans_chain_policy(trans);
3907 break;
3908 }
3909}
3910
b326dd37 3911static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 3912{
c7c32e72
PNA		 3913 switch (trans->msg_type) {
3914 case NFT_MSG_DELTABLE:
3915 nf_tables_table_destroy(&trans->ctx);
3916 break;
3917 case NFT_MSG_DELCHAIN:
3918 nf_tables_chain_destroy(trans->ctx.chain);
3919 break;
3920 case NFT_MSG_DELRULE:
3921 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3922 break;
3923 case NFT_MSG_DELSET:
3924 nft_set_destroy(nft_trans_set(trans));
3925 break;
61edafbb
PM		 3926 case NFT_MSG_DELSETELEM:
3927 nft_set_elem_destroy(nft_trans_elem_set(trans),
3928 nft_trans_elem(trans).priv);
3929 break;
c7c32e72
PNA		 3930 }
3931 kfree(trans);
3932}
3933
5913beaf 3934static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 3935{
37082f93 3936 struct nft_trans *trans, *next;
a3716e70 3937 struct nft_trans_elem *te;
37082f93
PNA		 3938
3939 /* Bump generation counter, invalidate any dump in progress */
38e029f1 3940 while (++net->nft.base_seq == 0);
37082f93
PNA		 3941
3942 /* A new generation has just started */
ea4bd995 3943 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 3944
3945 /* Make sure all packets have left the previous generation before
3946 * purging old rules.
3947 */
3948 synchronize_rcu();
3949
3950 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3951 switch (trans->msg_type) {
55dd6f93
PNA		 3952 case NFT_MSG_NEWTABLE:
3953 if (nft_trans_table_update(trans)) {
3954 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 3955 nf_tables_table_disable(net,
3956 trans->ctx.afi,
55dd6f93
PNA		 3957 trans->ctx.table);
3958 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3959 }
3960 } else {
f2a6d766 3961 nft_clear(net, trans->ctx.table);
55dd6f93 3962 }
35151d84 3963 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 3964 nft_trans_destroy(trans);
3965 break;
3966 case NFT_MSG_DELTABLE:
f2a6d766 3967 list_del_rcu(&trans->ctx.table->list);
35151d84 3968 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 3969 break;
91c7b38d
PNA		 3970 case NFT_MSG_NEWCHAIN:
3971 if (nft_trans_chain_update(trans))
3972 nft_chain_commit_update(trans);
4fefee57 3973 else
664b0f8c 3974 nft_clear(net, trans->ctx.chain);
4fefee57 3975
35151d84 3976 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 3977 nft_trans_destroy(trans);
3978 break;
3979 case NFT_MSG_DELCHAIN:
664b0f8c 3980 list_del_rcu(&trans->ctx.chain->list);
35151d84 3981 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 3982 nf_tables_unregister_hooks(trans->ctx.net,
3983 trans->ctx.table,
c5598794
AB		 3984 trans->ctx.chain,
3985 trans->ctx.afi->nops);
91c7b38d 3986 break;
b380e5c7 3987 case NFT_MSG_NEWRULE:
889f7ee7 3988 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 3989 nf_tables_rule_notify(&trans->ctx,
37082f93 3990 nft_trans_rule(trans),
35151d84 3991 NFT_MSG_NEWRULE);
37082f93 3992 nft_trans_destroy(trans);
b380e5c7
PNA		 3993 break;
3994 case NFT_MSG_DELRULE:
3995 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 3996 nf_tables_rule_notify(&trans->ctx,
3997 nft_trans_rule(trans),
3998 NFT_MSG_DELRULE);
b380e5c7 3999 break;
958bee14 4000 case NFT_MSG_NEWSET:
37a9cc52 4001 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 4002 /* This avoids hitting -EBUSY when deleting the table
4003 * from the transaction.
4004 */
4005 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4006 !list_empty(&nft_trans_set(trans)->bindings))
4007 trans->ctx.table->use--;
4008
958bee14 4009 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4010 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4011 nft_trans_destroy(trans);
4012 break;
4013 case NFT_MSG_DELSET:
37a9cc52 4014 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 4015 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4016 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4017 break;
60319eb1 4018 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4019 te = (struct nft_trans_elem *)trans->data;
4020
4021 te->set->ops->activate(te->set, &te->elem);
4022 nf_tables_setelem_notify(&trans->ctx, te->set,
4023 &te->elem,
60319eb1
PNA		 4024 NFT_MSG_NEWSETELEM, 0);
4025 nft_trans_destroy(trans);
4026 break;
4027 case NFT_MSG_DELSETELEM:
a3716e70 4028 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4029
a3716e70
PNA		 4030 nf_tables_setelem_notify(&trans->ctx, te->set,
4031 &te->elem,
60319eb1 4032 NFT_MSG_DELSETELEM, 0);
02263db0 4033 te->set->ops->remove(te->set, &te->elem);
3dd0673a
PM		 4034 atomic_dec(&te->set->nelems);
4035 te->set->ndeact--;
60319eb1 4036 break;
37082f93 4037 }
37082f93
PNA		 4038 }
4039
b326dd37
PNA		 4040 synchronize_rcu();
4041
37082f93 4042 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4043 list_del(&trans->list);
b326dd37 4044 nf_tables_commit_release(trans);
37082f93 4045 }
84d7fce6
PNA		 4046
4047 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4048
4049 return 0;
4050}
4051
b326dd37 4052static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4053{
c7c32e72
PNA		 4054 switch (trans->msg_type) {
4055 case NFT_MSG_NEWTABLE:
4056 nf_tables_table_destroy(&trans->ctx);
4057 break;
4058 case NFT_MSG_NEWCHAIN:
4059 nf_tables_chain_destroy(trans->ctx.chain);
4060 break;
4061 case NFT_MSG_NEWRULE:
4062 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4063 break;
4064 case NFT_MSG_NEWSET:
4065 nft_set_destroy(nft_trans_set(trans));
4066 break;
61edafbb
PM		 4067 case NFT_MSG_NEWSETELEM:
4068 nft_set_elem_destroy(nft_trans_elem_set(trans),
4069 nft_trans_elem(trans).priv);
4070 break;
c7c32e72
PNA		 4071 }
4072 kfree(trans);
4073}
4074
5913beaf 4075static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4076{
37082f93 4077 struct nft_trans *trans, *next;
02263db0 4078 struct nft_trans_elem *te;
37082f93 4079
a907e36d
XL		 4080 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4081 list) {
b380e5c7 4082 switch (trans->msg_type) {
55dd6f93
PNA		 4083 case NFT_MSG_NEWTABLE:
4084 if (nft_trans_table_update(trans)) {
4085 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4086 nf_tables_table_disable(net,
4087 trans->ctx.afi,
55dd6f93
PNA		 4088 trans->ctx.table);
4089 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4090 }
4091 nft_trans_destroy(trans);
4092 } else {
e688a7f8 4093 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4094 }
4095 break;
4096 case NFT_MSG_DELTABLE:
f2a6d766 4097 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 4098 nft_trans_destroy(trans);
4099 break;
91c7b38d
PNA		 4100 case NFT_MSG_NEWCHAIN:
4101 if (nft_trans_chain_update(trans)) {
982f4051 4102 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4103
4104 nft_trans_destroy(trans);
4105 } else {
4fefee57 4106 trans->ctx.table->use--;
e688a7f8 4107 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 4108 nf_tables_unregister_hooks(trans->ctx.net,
4109 trans->ctx.table,
c5598794
AB		 4110 trans->ctx.chain,
4111 trans->ctx.afi->nops);
91c7b38d
PNA		 4112 }
4113 break;
4114 case NFT_MSG_DELCHAIN:
4fefee57 4115 trans->ctx.table->use++;
664b0f8c 4116 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 4117 nft_trans_destroy(trans);
4118 break;
b380e5c7 4119 case NFT_MSG_NEWRULE:
4fefee57 4120 trans->ctx.chain->use--;
b380e5c7
PNA		 4121 list_del_rcu(&nft_trans_rule(trans)->list);
4122 break;
4123 case NFT_MSG_DELRULE:
4fefee57 4124 trans->ctx.chain->use++;
889f7ee7 4125 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4126 nft_trans_destroy(trans);
b380e5c7 4127 break;
958bee14 4128 case NFT_MSG_NEWSET:
4fefee57 4129 trans->ctx.table->use--;
e688a7f8 4130 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4131 break;
4132 case NFT_MSG_DELSET:
4fefee57 4133 trans->ctx.table->use++;
37a9cc52 4134 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 4135 nft_trans_destroy(trans);
4136 break;
60319eb1 4137 case NFT_MSG_NEWSETELEM:
02263db0 4138 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4139
02263db0 4140 te->set->ops->remove(te->set, &te->elem);
3dd0673a 4141 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4142 break;
4143 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4144 te = (struct nft_trans_elem *)trans->data;
4145
cc02e457 4146 te->set->ops->activate(te->set, &te->elem);
3dd0673a 4147 te->set->ndeact--;
cc02e457 4148
60319eb1
PNA		 4149 nft_trans_destroy(trans);
4150 break;
37082f93 4151 }
37082f93
PNA		 4152 }
4153
b326dd37
PNA		 4154 synchronize_rcu();
4155
a1cee076
PNA		 4156 list_for_each_entry_safe_reverse(trans, next,
4157 &net->nft.commit_list, list) {
c7c32e72 4158 list_del(&trans->list);
b326dd37 4159 nf_tables_abort_release(trans);
37082f93
PNA		 4160 }
4161
4162 return 0;
4163}
4164
96518518
PM		 4165static const struct nfnetlink_subsystem nf_tables_subsys = {
4166 .name = "nf_tables",
4167 .subsys_id = NFNL_SUBSYS_NFTABLES,
4168 .cb_count = NFT_MSG_MAX,
4169 .cb = nf_tables_cb,
0628b123
PNA		 4170 .commit = nf_tables_commit,
4171 .abort = nf_tables_abort,
96518518
PM		 4172};
4173
7210e4e3
PNA		 4174int nft_chain_validate_dependency(const struct nft_chain *chain,
4175 enum nft_chain_type type)
4176{
4177 const struct nft_base_chain *basechain;
4178
4179 if (chain->flags & NFT_BASE_CHAIN) {
4180 basechain = nft_base_chain(chain);
4181 if (basechain->type->type != type)
4182 return -EOPNOTSUPP;
4183 }
4184 return 0;
4185}
4186EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
4187
75e8d06d
PNA		 4188int nft_chain_validate_hooks(const struct nft_chain *chain,
4189 unsigned int hook_flags)
4190{
4191 struct nft_base_chain *basechain;
4192
4193 if (chain->flags & NFT_BASE_CHAIN) {
4194 basechain = nft_base_chain(chain);
4195
4196 if ((1 << basechain->ops[0].hooknum) & hook_flags)
4197 return 0;
4198
4199 return -EOPNOTSUPP;
4200 }
4201
4202 return 0;
4203}
4204EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
4205
20a69341
PM		 4206/*
4207 * Loop detection - walk through the ruleset beginning at the destination chain
4208 * of a new jump until either the source chain is reached (loop) or all
4209 * reachable chains have been traversed.
4210 *
4211 * The loop check is performed whenever a new jump verdict is added to an
4212 * expression or verdict map or a verdict map is bound to a new chain.
4213 */
4214
4215static int nf_tables_check_loops(const struct nft_ctx *ctx,
4216 const struct nft_chain *chain);
4217
4218static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
4219 const struct nft_set *set,
4220 const struct nft_set_iter *iter,
4221 const struct nft_set_elem *elem)
4222{
fe2811eb
PM		 4223 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4224 const struct nft_data *data;
4225
4226 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4227 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 4228 return 0;
4229
fe2811eb 4230 data = nft_set_ext_data(ext);
1ca2e170 4231 switch (data->verdict.code) {
20a69341
PM		 4232 case NFT_JUMP:
4233 case NFT_GOTO:
1ca2e170 4234 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4235 default:
4236 return 0;
4237 }
4238}
4239
4240static int nf_tables_check_loops(const struct nft_ctx *ctx,
4241 const struct nft_chain *chain)
4242{
4243 const struct nft_rule *rule;
4244 const struct nft_expr *expr, *last;
20a69341
PM		 4245 const struct nft_set *set;
4246 struct nft_set_binding *binding;
4247 struct nft_set_iter iter;
20a69341
PM		 4248
4249 if (ctx->chain == chain)
4250 return -ELOOP;
4251
4252 list_for_each_entry(rule, &chain->rules, list) {
4253 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 4254 const struct nft_data *data = NULL;
4255 int err;
4256
4257 if (!expr->ops->validate)
20a69341
PM		 4258 continue;
4259
0ca743a5
PNA		 4260 err = expr->ops->validate(ctx, expr, &data);
4261 if (err < 0)
4262 return err;
4263
20a69341 4264 if (data == NULL)
0ca743a5 4265 continue;
20a69341 4266
1ca2e170 4267 switch (data->verdict.code) {
20a69341
PM		 4268 case NFT_JUMP:
4269 case NFT_GOTO:
1ca2e170
PM		 4270 err = nf_tables_check_loops(ctx,
4271 data->verdict.chain);
20a69341
PM		 4272 if (err < 0)
4273 return err;
4274 default:
4275 break;
4276 }
4277 }
4278 }
4279
4280 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 4281 if (!nft_is_active_next(ctx->net, set))
4282 continue;
20a69341
PM		 4283 if (!(set->flags & NFT_SET_MAP) ||
4284 set->dtype != NFT_DATA_VERDICT)
4285 continue;
4286
4287 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 4288 if (!(binding->flags & NFT_SET_MAP) ||
4289 binding->chain != chain)
20a69341
PM		 4290 continue;
4291
8588ac09 4292 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4293 iter.skip = 0;
4294 iter.count = 0;
4295 iter.err = 0;
4296 iter.fn = nf_tables_loop_check_setelem;
4297
4298 set->ops->walk(ctx, set, &iter);
4299 if (iter.err < 0)
4300 return iter.err;
4301 }
4302 }
4303
4304 return 0;
4305}
4306
49499c3e
PM		 4307/**
4308 * nft_parse_register - parse a register value from a netlink attribute
4309 *
4310 * @attr: netlink attribute
4311 *
4312 * Parse and translate a register value from a netlink attribute.
4313 * Registers used to be 128 bit wide, these register numbers will be
4314 * mapped to the corresponding 32 bit register numbers.
4315 */
b1c96ed3
PM		 4316unsigned int nft_parse_register(const struct nlattr *attr)
4317{
49499c3e
PM		 4318 unsigned int reg;
4319
4320 reg = ntohl(nla_get_be32(attr));
4321 switch (reg) {
4322 case NFT_REG_VERDICT...NFT_REG_4:
4323 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
4324 default:
4325 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
4326 }
b1c96ed3
PM		 4327}
4328EXPORT_SYMBOL_GPL(nft_parse_register);
4329
49499c3e
PM		 4330/**
4331 * nft_dump_register - dump a register value to a netlink attribute
4332 *
4333 * @skb: socket buffer
4334 * @attr: attribute number
4335 * @reg: register number
4336 *
4337 * Construct a netlink attribute containing the register number. For
4338 * compatibility reasons, register numbers being a multiple of 4 are
4339 * translated to the corresponding 128 bit register numbers.
4340 */
b1c96ed3
PM		 4341int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
4342{
49499c3e
PM		 4343 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
4344 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
4345 else
4346 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
4347
b1c96ed3
PM		 4348 return nla_put_be32(skb, attr, htonl(reg));
4349}
4350EXPORT_SYMBOL_GPL(nft_dump_register);
4351
96518518 4352/**
d07db988 4353 * nft_validate_register_load - validate a load from a register
96518518
PM		 4354 *
4355 * @reg: the register number
d07db988 4356 * @len: the length of the data
96518518
PM		 4357 *
4358 * Validate that the input register is one of the general purpose
d07db988 4359 * registers and that the length of the load is within the bounds.
96518518 4360 */
d07db988 4361int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 4362{
49499c3e 4363 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 4364 return -EINVAL;
d07db988
PM		 4365 if (len == 0)
4366 return -EINVAL;
49499c3e 4367 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 4368 return -ERANGE;
49499c3e 4369
96518518
PM		 4370 return 0;
4371}
d07db988 4372EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 4373
96518518 4374/**
1ec10212 4375 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 4376 *
4377 * @ctx: context of the expression performing the load
4378 * @reg: the destination register number
4379 * @data: the data to load
4380 * @type: the data type
45d9bcda 4381 * @len: the length of the data
96518518
PM		 4382 *
4383 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 4384 * the destination register and the length is within the bounds.
4385 * A value of NULL for the data means that its runtime gathered
58f40ab6 4386 * data.
96518518 4387 */
1ec10212
PM		 4388int nft_validate_register_store(const struct nft_ctx *ctx,
4389 enum nft_registers reg,
4390 const struct nft_data *data,
4391 enum nft_data_types type, unsigned int len)
96518518 4392{
20a69341
PM		 4393 int err;
4394
96518518
PM		 4395 switch (reg) {
4396 case NFT_REG_VERDICT:
58f40ab6 4397 if (type != NFT_DATA_VERDICT)
96518518 4398 return -EINVAL;
20a69341 4399
58f40ab6 4400 if (data != NULL &&
1ca2e170
PM		 4401 (data->verdict.code == NFT_GOTO ||
4402 data->verdict.code == NFT_JUMP)) {
4403 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 4404 if (err < 0)
4405 return err;
4406
1ca2e170
PM		 4407 if (ctx->chain->level + 1 >
4408 data->verdict.chain->level) {
20a69341
PM		 4409 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
4410 return -EMLINK;
1ca2e170 4411 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 4412 }
4413 }
4414
96518518
PM		 4415 return 0;
4416 default:
49499c3e 4417 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 4418 return -EINVAL;
45d9bcda
PM		 4419 if (len == 0)
4420 return -EINVAL;
49499c3e
PM		 4421 if (reg * NFT_REG32_SIZE + len >
4422 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 4423 return -ERANGE;
27e6d201 4424
96518518
PM		 4425 if (data != NULL && type != NFT_DATA_VALUE)
4426 return -EINVAL;
4427 return 0;
4428 }
4429}
1ec10212 4430EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 4431
4432static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
4433 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
4434 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
4435 .len = NFT_CHAIN_MAXNAMELEN - 1 },
4436};
4437
4438static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
4439 struct nft_data_desc *desc, const struct nlattr *nla)
4440{
664b0f8c 4441 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 4442 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
4443 struct nft_chain *chain;
4444 int err;
4445
4446 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
4447 if (err < 0)
4448 return err;
4449
4450 if (!tb[NFTA_VERDICT_CODE])
4451 return -EINVAL;
1ca2e170 4452 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 4453
1ca2e170 4454 switch (data->verdict.code) {
e0abdadc 4455 default:
1ca2e170 4456 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 4457 case NF_ACCEPT:
4458 case NF_DROP:
4459 case NF_QUEUE:
4460 break;
4461 default:
4462 return -EINVAL;
4463 }
4464 /* fall through */
96518518
PM		 4465 case NFT_CONTINUE:
4466 case NFT_BREAK:
4467 case NFT_RETURN:
96518518
PM		 4468 break;
4469 case NFT_JUMP:
4470 case NFT_GOTO:
4471 if (!tb[NFTA_VERDICT_CHAIN])
4472 return -EINVAL;
4473 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 4474 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 4475 if (IS_ERR(chain))
4476 return PTR_ERR(chain);
4477 if (chain->flags & NFT_BASE_CHAIN)
4478 return -EOPNOTSUPP;
4479
96518518 4480 chain->use++;
1ca2e170 4481 data->verdict.chain = chain;
96518518 4482 break;
96518518
PM		 4483 }
4484
4c4ed074 4485 desc->len = sizeof(data->verdict);
96518518
PM		 4486 desc->type = NFT_DATA_VERDICT;
4487 return 0;
4488}
4489
4490static void nft_verdict_uninit(const struct nft_data *data)
4491{
1ca2e170 4492 switch (data->verdict.code) {
96518518
PM		 4493 case NFT_JUMP:
4494 case NFT_GOTO:
1ca2e170 4495 data->verdict.chain->use--;
96518518
PM		 4496 break;
4497 }
4498}
4499
33d5a7b1 4500int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 4501{
4502 struct nlattr *nest;
4503
33d5a7b1 4504 nest = nla_nest_start(skb, type);
96518518
PM		 4505 if (!nest)
4506 goto nla_put_failure;
4507
33d5a7b1 4508 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 4509 goto nla_put_failure;
4510
33d5a7b1 4511 switch (v->code) {
96518518
PM		 4512 case NFT_JUMP:
4513 case NFT_GOTO:
1ca2e170 4514 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 4515 v->chain->name))
96518518
PM		 4516 goto nla_put_failure;
4517 }
4518 nla_nest_end(skb, nest);
4519 return 0;
4520
4521nla_put_failure:
4522 return -1;
4523}
4524
d0a11fc3
PM		 4525static int nft_value_init(const struct nft_ctx *ctx,
4526 struct nft_data *data, unsigned int size,
96518518
PM		 4527 struct nft_data_desc *desc, const struct nlattr *nla)
4528{
4529 unsigned int len;
4530
4531 len = nla_len(nla);
4532 if (len == 0)
4533 return -EINVAL;
d0a11fc3 4534 if (len > size)
96518518
PM		 4535 return -EOVERFLOW;
4536
d0a11fc3 4537 nla_memcpy(data->data, nla, len);
96518518
PM		 4538 desc->type = NFT_DATA_VALUE;
4539 desc->len = len;
4540 return 0;
4541}
4542
4543static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4544 unsigned int len)
4545{
4546 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4547}
4548
4549static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 4550 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 4551 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4552};
4553
4554/**
4555 * nft_data_init - parse nf_tables data netlink attributes
4556 *
4557 * @ctx: context of the expression using the data
4558 * @data: destination struct nft_data
d0a11fc3 4559 * @size: maximum data length
96518518
PM		 4560 * @desc: data description
4561 * @nla: netlink attribute containing data
4562 *
4563 * Parse the netlink data attributes and initialize a struct nft_data.
4564 * The type and length of data are returned in the data description.
4565 *
4566 * The caller can indicate that it only wants to accept data of type
4567 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4568 */
d0a11fc3
PM		 4569int nft_data_init(const struct nft_ctx *ctx,
4570 struct nft_data *data, unsigned int size,
96518518
PM		 4571 struct nft_data_desc *desc, const struct nlattr *nla)
4572{
4573 struct nlattr *tb[NFTA_DATA_MAX + 1];
4574 int err;
4575
4576 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4577 if (err < 0)
4578 return err;
4579
4580 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 4581 return nft_value_init(ctx, data, size, desc,
4582 tb[NFTA_DATA_VALUE]);
96518518
PM		 4583 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4584 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4585 return -EINVAL;
4586}
4587EXPORT_SYMBOL_GPL(nft_data_init);
4588
4589/**
4590 * nft_data_uninit - release a nft_data item
4591 *
4592 * @data: struct nft_data to release
4593 * @type: type of data
4594 *
4595 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4596 * all others need to be released by calling this function.
4597 */
4598void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4599{
960bd2c2 4600 if (type < NFT_DATA_VERDICT)
96518518 4601 return;
960bd2c2 4602 switch (type) {
96518518
PM		 4603 case NFT_DATA_VERDICT:
4604 return nft_verdict_uninit(data);
4605 default:
4606 WARN_ON(1);
4607 }
4608}
4609EXPORT_SYMBOL_GPL(nft_data_uninit);
4610
4611int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4612 enum nft_data_types type, unsigned int len)
4613{
4614 struct nlattr *nest;
4615 int err;
4616
4617 nest = nla_nest_start(skb, attr);
4618 if (nest == NULL)
4619 return -1;
4620
4621 switch (type) {
4622 case NFT_DATA_VALUE:
4623 err = nft_value_dump(skb, data, len);
4624 break;
4625 case NFT_DATA_VERDICT:
33d5a7b1 4626 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 4627 break;
4628 default:
4629 err = -EINVAL;
4630 WARN_ON(1);
4631 }
4632
4633 nla_nest_end(skb, nest);
4634 return err;
4635}
4636EXPORT_SYMBOL_GPL(nft_data_dump);
4637
df05ef87 4638static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 4639{
4640 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 4641 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 4642 net->nft.base_seq = 1;
99633ab2
PNA		 4643 return 0;
4644}
4645
5ebe0b0e
PNA		 4646int __nft_release_basechain(struct nft_ctx *ctx)
4647{
4648 struct nft_rule *rule, *nr;
4649
4650 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
4651
82bec71d 4652 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 4653 ctx->afi->nops);
4654 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
4655 list_del(&rule->list);
4656 ctx->chain->use--;
4657 nf_tables_rule_destroy(ctx, rule);
4658 }
4659 list_del(&ctx->chain->list);
4660 ctx->table->use--;
4661 nf_tables_chain_destroy(ctx->chain);
4662
4663 return 0;
4664}
4665EXPORT_SYMBOL_GPL(__nft_release_basechain);
4666
df05ef87
PNA		 4667/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
4668static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
4669{
4670 struct nft_table *table, *nt;
4671 struct nft_chain *chain, *nc;
4672 struct nft_rule *rule, *nr;
4673 struct nft_set *set, *ns;
4674 struct nft_ctx ctx = {
4675 .net = net,
4676 .afi = afi,
4677 };
4678
4679 list_for_each_entry_safe(table, nt, &afi->tables, list) {
4680 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 4681 nf_tables_unregister_hooks(net, table, chain,
4682 afi->nops);
df05ef87
PNA		 4683 /* No packets are walking on these chains anymore. */
4684 ctx.table = table;
4685 list_for_each_entry(chain, &table->chains, list) {
4686 ctx.chain = chain;
4687 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
4688 list_del(&rule->list);
4689 chain->use--;
4690 nf_tables_rule_destroy(&ctx, rule);
4691 }
4692 }
4693 list_for_each_entry_safe(set, ns, &table->sets, list) {
4694 list_del(&set->list);
4695 table->use--;
4696 nft_set_destroy(set);
4697 }
4698 list_for_each_entry_safe(chain, nc, &table->chains, list) {
4699 list_del(&chain->list);
4700 table->use--;
4701 nf_tables_chain_destroy(chain);
4702 }
4703 list_del(&table->list);
4704 nf_tables_table_destroy(&ctx);
4705 }
4706}
4707
99633ab2
PNA		 4708static struct pernet_operations nf_tables_net_ops = {
4709 .init = nf_tables_init_net,
4710};
4711
96518518
PM		 4712static int __init nf_tables_module_init(void)
4713{
4714 int err;
4715
4716 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4717 GFP_KERNEL);
4718 if (info == NULL) {
4719 err = -ENOMEM;
4720 goto err1;
4721 }
4722
4723 err = nf_tables_core_module_init();
4724 if (err < 0)
4725 goto err2;
4726
4727 err = nfnetlink_subsys_register(&nf_tables_subsys);
4728 if (err < 0)
4729 goto err3;
4730
4731 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 4732 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 4733err3:
4734 nf_tables_core_module_exit();
4735err2:
4736 kfree(info);
4737err1:
4738 return err;
4739}
4740
4741static void __exit nf_tables_module_exit(void)
4742{
99633ab2 4743 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 4744 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 4745 rcu_barrier();
96518518
PM		 4746 nf_tables_core_module_exit();
4747 kfree(info);
4748}
4749
4750module_init(nf_tables_module_init);
4751module_exit(nf_tables_module_exit);
4752
4753MODULE_LICENSE("GPL");
4754MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4755MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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