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netfilter: Remove uses of seq_<foo> return values
[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
44/**
45 * nft_unregister_afinfo - unregister nf_tables address family info
46 *
47 * @afi: address family info to unregister
48 *
49 * Unregister the address family for use with nf_tables.
50 */
51void nft_unregister_afinfo(struct nft_af_info *afi)
52{
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 54 list_del_rcu(&afi->list);
96518518
PM		 55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
56}
57EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
58
99633ab2 59static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 60{
61 struct nft_af_info *afi;
62
99633ab2 63 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 64 if (afi->family == family)
65 return afi;
66 }
67 return NULL;
68}
69
99633ab2
PNA		 70static struct nft_af_info *
71nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 72{
73 struct nft_af_info *afi;
74
99633ab2 75 afi = nft_afinfo_lookup(net, family);
96518518
PM		 76 if (afi != NULL)
77 return afi;
78#ifdef CONFIG_MODULES
79 if (autoload) {
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 83 afi = nft_afinfo_lookup(net, family);
96518518
PM		 84 if (afi != NULL)
85 return ERR_PTR(-EAGAIN);
86 }
87#endif
88 return ERR_PTR(-EAFNOSUPPORT);
89}
90
7c95f6d8
PNA		 91static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
98{
128ad332
PNA		 99 ctx->net = sock_net(skb->sk);
100 ctx->afi = afi;
101 ctx->table = table;
102 ctx->chain = chain;
103 ctx->nla = nla;
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 107}
108
b380e5c7
PNA		 109static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
110 u32 size)
1081d11b
PNA		 111{
112 struct nft_trans *trans;
113
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
115 if (trans == NULL)
116 return NULL;
117
b380e5c7 118 trans->msg_type = msg_type;
1081d11b
PNA		 119 trans->ctx = *ctx;
120
121 return trans;
122}
123
124static void nft_trans_destroy(struct nft_trans *trans)
125{
126 list_del(&trans->list);
127 kfree(trans);
128}
129
c5598794
AB		 130static void nf_tables_unregister_hooks(const struct nft_table *table,
131 const struct nft_chain *chain,
132 unsigned int hook_nops)
133{
134 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
135 chain->flags & NFT_BASE_CHAIN)
136 nf_unregister_hooks(nft_base_chain(chain)->ops, hook_nops);
137}
138
ee01d542
AB		 139/* Internal table flags */
140#define NFT_TABLE_INACTIVE (1 << 15)
141
142static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
143{
144 struct nft_trans *trans;
145
146 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
147 if (trans == NULL)
148 return -ENOMEM;
149
150 if (msg_type == NFT_MSG_NEWTABLE)
151 ctx->table->flags |= NFT_TABLE_INACTIVE;
152
153 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
154 return 0;
155}
156
157static int nft_deltable(struct nft_ctx *ctx)
158{
159 int err;
160
161 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
162 if (err < 0)
163 return err;
164
165 list_del_rcu(&ctx->table->list);
166 return err;
167}
168
169static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
170{
171 struct nft_trans *trans;
172
173 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
174 if (trans == NULL)
175 return -ENOMEM;
176
177 if (msg_type == NFT_MSG_NEWCHAIN)
178 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
179
180 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
181 return 0;
182}
183
184static int nft_delchain(struct nft_ctx *ctx)
185{
186 int err;
187
188 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
189 if (err < 0)
190 return err;
191
192 ctx->table->use--;
193 list_del_rcu(&ctx->chain->list);
194
195 return err;
196}
197
198static inline bool
199nft_rule_is_active(struct net *net, const struct nft_rule *rule)
200{
201 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
202}
203
204static inline int gencursor_next(struct net *net)
205{
206 return net->nft.gencursor+1 == 1 ? 1 : 0;
207}
208
209static inline int
210nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
211{
212 return (rule->genmask & (1 << gencursor_next(net))) == 0;
213}
214
215static inline void
216nft_rule_activate_next(struct net *net, struct nft_rule *rule)
217{
218 /* Now inactive, will be active in the future */
219 rule->genmask = (1 << net->nft.gencursor);
220}
221
222static inline void
223nft_rule_deactivate_next(struct net *net, struct nft_rule *rule)
224{
225 rule->genmask = (1 << gencursor_next(net));
226}
227
228static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
229{
8670c3a5 230 rule->genmask &= ~(1 << gencursor_next(net));
ee01d542
AB		 231}
232
233static int
234nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
235{
236 /* You cannot delete the same rule twice */
237 if (nft_rule_is_active_next(ctx->net, rule)) {
238 nft_rule_deactivate_next(ctx->net, rule);
239 ctx->chain->use--;
240 return 0;
241 }
242 return -ENOENT;
243}
244
245static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
246 struct nft_rule *rule)
247{
248 struct nft_trans *trans;
249
250 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
251 if (trans == NULL)
252 return NULL;
253
254 nft_trans_rule(trans) = rule;
255 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
256
257 return trans;
258}
259
260static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
261{
262 struct nft_trans *trans;
263 int err;
264
265 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
266 if (trans == NULL)
267 return -ENOMEM;
268
269 err = nf_tables_delrule_deactivate(ctx, rule);
270 if (err < 0) {
271 nft_trans_destroy(trans);
272 return err;
273 }
274
275 return 0;
276}
277
278static int nft_delrule_by_chain(struct nft_ctx *ctx)
279{
280 struct nft_rule *rule;
281 int err;
282
283 list_for_each_entry(rule, &ctx->chain->rules, list) {
284 err = nft_delrule(ctx, rule);
285 if (err < 0)
286 return err;
287 }
288 return 0;
289}
290
291/* Internal set flag */
292#define NFT_SET_INACTIVE (1 << 15)
293
294static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
295 struct nft_set *set)
296{
297 struct nft_trans *trans;
298
299 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
300 if (trans == NULL)
301 return -ENOMEM;
302
303 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
304 nft_trans_set_id(trans) =
305 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
306 set->flags |= NFT_SET_INACTIVE;
307 }
308 nft_trans_set(trans) = set;
309 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
310
311 return 0;
312}
313
314static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
315{
316 int err;
317
318 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
319 if (err < 0)
320 return err;
321
322 list_del_rcu(&set->list);
323 ctx->table->use--;
324
325 return err;
326}
327
96518518
PM		 328/*
329 * Tables
330 */
331
332static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
333 const struct nlattr *nla)
334{
335 struct nft_table *table;
336
337 list_for_each_entry(table, &afi->tables, list) {
338 if (!nla_strcmp(nla, table->name))
339 return table;
340 }
341 return NULL;
342}
343
344static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
9370761c 345 const struct nlattr *nla)
96518518
PM		 346{
347 struct nft_table *table;
348
349 if (nla == NULL)
350 return ERR_PTR(-EINVAL);
351
352 table = nft_table_lookup(afi, nla);
353 if (table != NULL)
354 return table;
355
96518518
PM		 356 return ERR_PTR(-ENOENT);
357}
358
359static inline u64 nf_tables_alloc_handle(struct nft_table *table)
360{
361 return ++table->hgenerator;
362}
363
2a37d755 364static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
9370761c 365
2a37d755 366static const struct nf_chain_type *
baae3e62 367__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 368{
369 int i;
370
baae3e62 371 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 372 if (chain_type[family][i] != NULL &&
373 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 374 return chain_type[family][i];
9370761c 375 }
baae3e62 376 return NULL;
9370761c
PNA		 377}
378
2a37d755 379static const struct nf_chain_type *
baae3e62
PM		 380nf_tables_chain_type_lookup(const struct nft_af_info *afi,
381 const struct nlattr *nla,
382 bool autoload)
9370761c 383{
2a37d755 384 const struct nf_chain_type *type;
9370761c
PNA		 385
386 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 387 if (type != NULL)
388 return type;
9370761c 389#ifdef CONFIG_MODULES
93b0806f 390 if (autoload) {
9370761c 391 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 392 request_module("nft-chain-%u-%.*s", afi->family,
393 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 394 nfnl_lock(NFNL_SUBSYS_NFTABLES);
395 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 396 if (type != NULL)
397 return ERR_PTR(-EAGAIN);
9370761c
PNA		 398 }
399#endif
93b0806f 400 return ERR_PTR(-ENOENT);
9370761c
PNA		 401}
402
96518518 403static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 404 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
405 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 406 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 407};
408
84d7fce6
PNA		 409static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
410 u32 portid, u32 seq, int event, u32 flags,
411 int family, const struct nft_table *table)
96518518
PM		 412{
413 struct nlmsghdr *nlh;
414 struct nfgenmsg *nfmsg;
415
416 event |= NFNL_SUBSYS_NFTABLES << 8;
417 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
418 if (nlh == NULL)
419 goto nla_put_failure;
420
421 nfmsg = nlmsg_data(nlh);
422 nfmsg->nfgen_family = family;
423 nfmsg->version = NFNETLINK_V0;
84d7fce6 424 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 425
9ddf6323 426 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 427 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
428 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 429 goto nla_put_failure;
430
053c095a
JB		 431 nlmsg_end(skb, nlh);
432 return 0;
96518518
PM		 433
434nla_put_failure:
435 nlmsg_trim(skb, nlh);
436 return -1;
437}
438
35151d84 439static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 440{
441 struct sk_buff *skb;
96518518
PM		 442 int err;
443
128ad332
PNA		 444 if (!ctx->report &&
445 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 446 return 0;
447
448 err = -ENOBUFS;
449 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
450 if (skb == NULL)
451 goto err;
452
84d7fce6
PNA		 453 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
454 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 455 if (err < 0) {
456 kfree_skb(skb);
457 goto err;
458 }
459
128ad332
PNA		 460 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
461 ctx->report, GFP_KERNEL);
96518518 462err:
128ad332
PNA		 463 if (err < 0) {
464 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
465 err);
466 }
96518518
PM		 467 return err;
468}
469
470static int nf_tables_dump_tables(struct sk_buff *skb,
471 struct netlink_callback *cb)
472{
473 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
474 const struct nft_af_info *afi;
475 const struct nft_table *table;
476 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 477 struct net *net = sock_net(skb->sk);
96518518
PM		 478 int family = nfmsg->nfgen_family;
479
e688a7f8 480 rcu_read_lock();
38e029f1
PNA		 481 cb->seq = net->nft.base_seq;
482
e688a7f8 483 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 484 if (family != NFPROTO_UNSPEC && family != afi->family)
485 continue;
486
e688a7f8 487 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 488 if (idx < s_idx)
489 goto cont;
490 if (idx > s_idx)
491 memset(&cb->args[1], 0,
492 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 493 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 494 NETLINK_CB(cb->skb).portid,
495 cb->nlh->nlmsg_seq,
496 NFT_MSG_NEWTABLE,
497 NLM_F_MULTI,
498 afi->family, table) < 0)
499 goto done;
38e029f1
PNA		 500
501 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 502cont:
503 idx++;
504 }
505 }
506done:
e688a7f8 507 rcu_read_unlock();
96518518
PM		 508 cb->args[0] = idx;
509 return skb->len;
510}
511
512static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
513 const struct nlmsghdr *nlh,
514 const struct nlattr * const nla[])
515{
516 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
517 const struct nft_af_info *afi;
518 const struct nft_table *table;
519 struct sk_buff *skb2;
99633ab2 520 struct net *net = sock_net(skb->sk);
96518518
PM		 521 int family = nfmsg->nfgen_family;
522 int err;
523
524 if (nlh->nlmsg_flags & NLM_F_DUMP) {
525 struct netlink_dump_control c = {
526 .dump = nf_tables_dump_tables,
527 };
528 return netlink_dump_start(nlsk, skb, nlh, &c);
529 }
530
99633ab2 531 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 532 if (IS_ERR(afi))
533 return PTR_ERR(afi);
534
9370761c 535 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 536 if (IS_ERR(table))
537 return PTR_ERR(table);
55dd6f93
PNA		 538 if (table->flags & NFT_TABLE_INACTIVE)
539 return -ENOENT;
96518518
PM		 540
541 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
542 if (!skb2)
543 return -ENOMEM;
544
84d7fce6 545 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 546 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
547 family, table);
548 if (err < 0)
549 goto err;
550
551 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
552
553err:
554 kfree_skb(skb2);
555 return err;
556}
557
115a60b1
PM		 558static int nf_tables_table_enable(const struct nft_af_info *afi,
559 struct nft_table *table)
9ddf6323
PNA		 560{
561 struct nft_chain *chain;
562 int err, i = 0;
563
564 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 565 if (!(chain->flags & NFT_BASE_CHAIN))
566 continue;
567
115a60b1 568 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
9ddf6323
PNA		 569 if (err < 0)
570 goto err;
571
572 i++;
573 }
574 return 0;
575err:
576 list_for_each_entry(chain, &table->chains, list) {
d2012975
PNA		 577 if (!(chain->flags & NFT_BASE_CHAIN))
578 continue;
579
9ddf6323
PNA		 580 if (i-- <= 0)
581 break;
582
115a60b1 583 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
9ddf6323
PNA		 584 }
585 return err;
586}
587
f75edf5e 588static void nf_tables_table_disable(const struct nft_af_info *afi,
115a60b1 589 struct nft_table *table)
9ddf6323
PNA		 590{
591 struct nft_chain *chain;
592
d2012975
PNA		 593 list_for_each_entry(chain, &table->chains, list) {
594 if (chain->flags & NFT_BASE_CHAIN)
115a60b1
PM		 595 nf_unregister_hooks(nft_base_chain(chain)->ops,
596 afi->nops);
d2012975 597 }
9ddf6323
PNA		 598}
599
e1aaca93 600static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 601{
55dd6f93 602 struct nft_trans *trans;
e1aaca93 603 u32 flags;
55dd6f93 604 int ret = 0;
9ddf6323 605
e1aaca93
PNA		 606 if (!ctx->nla[NFTA_TABLE_FLAGS])
607 return 0;
9ddf6323 608
e1aaca93
PNA		 609 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
610 if (flags & ~NFT_TABLE_F_DORMANT)
611 return -EINVAL;
612
63283dd2
PNA		 613 if (flags == ctx->table->flags)
614 return 0;
615
55dd6f93
PNA		 616 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
617 sizeof(struct nft_trans_table));
618 if (trans == NULL)
619 return -ENOMEM;
9ddf6323 620
e1aaca93
PNA		 621 if ((flags & NFT_TABLE_F_DORMANT) &&
622 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 623 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 624 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
625 ctx->table->flags & NFT_TABLE_F_DORMANT) {
626 ret = nf_tables_table_enable(ctx->afi, ctx->table);
55dd6f93 627 if (ret >= 0) {
e1aaca93 628 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 629 nft_trans_table_enable(trans) = true;
9ddf6323 630 }
9ddf6323 631 }
e1aaca93
PNA		 632 if (ret < 0)
633 goto err;
9ddf6323 634
55dd6f93
PNA		 635 nft_trans_table_update(trans) = true;
636 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
637 return 0;
9ddf6323 638err:
55dd6f93 639 nft_trans_destroy(trans);
9ddf6323
PNA		 640 return ret;
641}
642
96518518
PM		 643static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
644 const struct nlmsghdr *nlh,
645 const struct nlattr * const nla[])
646{
647 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
648 const struct nlattr *name;
649 struct nft_af_info *afi;
650 struct nft_table *table;
99633ab2 651 struct net *net = sock_net(skb->sk);
96518518 652 int family = nfmsg->nfgen_family;
c5c1f975 653 u32 flags = 0;
e1aaca93 654 struct nft_ctx ctx;
55dd6f93 655 int err;
96518518 656
99633ab2 657 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 658 if (IS_ERR(afi))
659 return PTR_ERR(afi);
660
661 name = nla[NFTA_TABLE_NAME];
9370761c 662 table = nf_tables_table_lookup(afi, name);
96518518
PM		 663 if (IS_ERR(table)) {
664 if (PTR_ERR(table) != -ENOENT)
665 return PTR_ERR(table);
666 table = NULL;
667 }
668
669 if (table != NULL) {
55dd6f93
PNA		 670 if (table->flags & NFT_TABLE_INACTIVE)
671 return -ENOENT;
96518518
PM		 672 if (nlh->nlmsg_flags & NLM_F_EXCL)
673 return -EEXIST;
674 if (nlh->nlmsg_flags & NLM_F_REPLACE)
675 return -EOPNOTSUPP;
e1aaca93
PNA		 676
677 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
678 return nf_tables_updtable(&ctx);
96518518
PM		 679 }
680
c5c1f975
PM		 681 if (nla[NFTA_TABLE_FLAGS]) {
682 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
683 if (flags & ~NFT_TABLE_F_DORMANT)
684 return -EINVAL;
685 }
686
7047f9d0
PM		 687 if (!try_module_get(afi->owner))
688 return -EAFNOSUPPORT;
689
1cae565e 690 table = kzalloc(sizeof(*table), GFP_KERNEL);
7047f9d0
PM		 691 if (table == NULL) {
692 module_put(afi->owner);
96518518 693 return -ENOMEM;
7047f9d0 694 }
96518518 695
1cae565e 696 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 697 INIT_LIST_HEAD(&table->chains);
20a69341 698 INIT_LIST_HEAD(&table->sets);
c5c1f975 699 table->flags = flags;
9ddf6323 700
55dd6f93
PNA		 701 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
702 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
703 if (err < 0) {
704 kfree(table);
705 module_put(afi->owner);
706 return err;
707 }
e688a7f8 708 list_add_tail_rcu(&table->list, &afi->tables);
96518518
PM		 709 return 0;
710}
711
b9ac12ef
AB		 712static int nft_flush_table(struct nft_ctx *ctx)
713{
714 int err;
715 struct nft_chain *chain, *nc;
716 struct nft_set *set, *ns;
717
a2f18db0 718 list_for_each_entry(chain, &ctx->table->chains, list) {
b9ac12ef
AB		 719 ctx->chain = chain;
720
721 err = nft_delrule_by_chain(ctx);
722 if (err < 0)
723 goto out;
b9ac12ef
AB		 724 }
725
726 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
727 if (set->flags & NFT_SET_ANONYMOUS &&
728 !list_empty(&set->bindings))
729 continue;
730
731 err = nft_delset(ctx, set);
732 if (err < 0)
733 goto out;
734 }
735
a2f18db0
PNA		 736 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
737 ctx->chain = chain;
738
739 err = nft_delchain(ctx);
740 if (err < 0)
741 goto out;
742 }
743
b9ac12ef
AB		 744 err = nft_deltable(ctx);
745out:
746 return err;
747}
748
749static int nft_flush(struct nft_ctx *ctx, int family)
750{
751 struct nft_af_info *afi;
752 struct nft_table *table, *nt;
753 const struct nlattr * const *nla = ctx->nla;
754 int err = 0;
755
756 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
757 if (family != AF_UNSPEC && afi->family != family)
758 continue;
759
760 ctx->afi = afi;
761 list_for_each_entry_safe(table, nt, &afi->tables, list) {
762 if (nla[NFTA_TABLE_NAME] &&
763 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
764 continue;
765
766 ctx->table = table;
767
768 err = nft_flush_table(ctx);
769 if (err < 0)
770 goto out;
771 }
772 }
773out:
774 return err;
775}
776
96518518
PM		 777static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
778 const struct nlmsghdr *nlh,
779 const struct nlattr * const nla[])
780{
781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
782 struct nft_af_info *afi;
783 struct nft_table *table;
99633ab2 784 struct net *net = sock_net(skb->sk);
ee01d542 785 int family = nfmsg->nfgen_family;
55dd6f93 786 struct nft_ctx ctx;
96518518 787
b9ac12ef
AB		 788 nft_ctx_init(&ctx, skb, nlh, NULL, NULL, NULL, nla);
789 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
790 return nft_flush(&ctx, family);
791
99633ab2 792 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 793 if (IS_ERR(afi))
794 return PTR_ERR(afi);
795
9370761c 796 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
96518518
PM		 797 if (IS_ERR(table))
798 return PTR_ERR(table);
55dd6f93
PNA		 799 if (table->flags & NFT_TABLE_INACTIVE)
800 return -ENOENT;
96518518 801
b9ac12ef
AB		 802 ctx.afi = afi;
803 ctx.table = table;
55dd6f93 804
b9ac12ef 805 return nft_flush_table(&ctx);
96518518
PM		 806}
807
55dd6f93
PNA		 808static void nf_tables_table_destroy(struct nft_ctx *ctx)
809{
4fefee57
PNA		 810 BUG_ON(ctx->table->use > 0);
811
55dd6f93
PNA		 812 kfree(ctx->table);
813 module_put(ctx->afi->owner);
814}
815
2a37d755 816int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 817{
9370761c 818 int err = 0;
96518518
PM		 819
820 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 821 if (chain_type[ctype->family][ctype->type] != NULL) {
822 err = -EBUSY;
823 goto out;
96518518 824 }
9370761c
PNA		 825 chain_type[ctype->family][ctype->type] = ctype;
826out:
96518518
PM		 827 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
828 return err;
829}
9370761c 830EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 831
2a37d755 832void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 833{
96518518 834 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 835 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 836 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
837}
9370761c 838EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 839
840/*
841 * Chains
842 */
843
844static struct nft_chain *
845nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
846{
847 struct nft_chain *chain;
848
849 list_for_each_entry(chain, &table->chains, list) {
850 if (chain->handle == handle)
851 return chain;
852 }
853
854 return ERR_PTR(-ENOENT);
855}
856
857static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
858 const struct nlattr *nla)
859{
860 struct nft_chain *chain;
861
862 if (nla == NULL)
863 return ERR_PTR(-EINVAL);
864
865 list_for_each_entry(chain, &table->chains, list) {
866 if (!nla_strcmp(nla, chain->name))
867 return chain;
868 }
869
870 return ERR_PTR(-ENOENT);
871}
872
873static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
874 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
875 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
876 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
877 .len = NFT_CHAIN_MAXNAMELEN - 1 },
878 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 879 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 880 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 881 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 882};
883
884static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
885 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
886 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
887};
888
0ca743a5
PNA		 889static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
890{
891 struct nft_stats *cpu_stats, total;
892 struct nlattr *nest;
ce355e20
ED		 893 unsigned int seq;
894 u64 pkts, bytes;
0ca743a5
PNA		 895 int cpu;
896
897 memset(&total, 0, sizeof(total));
898 for_each_possible_cpu(cpu) {
899 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 900 do {
901 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
902 pkts = cpu_stats->pkts;
903 bytes = cpu_stats->bytes;
904 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
905 total.pkts += pkts;
906 total.bytes += bytes;
0ca743a5
PNA		 907 }
908 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
909 if (nest == NULL)
910 goto nla_put_failure;
911
912 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
913 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
914 goto nla_put_failure;
915
916 nla_nest_end(skb, nest);
917 return 0;
918
919nla_put_failure:
920 return -ENOSPC;
921}
922
84d7fce6
PNA		 923static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
924 u32 portid, u32 seq, int event, u32 flags,
925 int family, const struct nft_table *table,
96518518
PM		 926 const struct nft_chain *chain)
927{
928 struct nlmsghdr *nlh;
929 struct nfgenmsg *nfmsg;
930
931 event |= NFNL_SUBSYS_NFTABLES << 8;
932 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
933 if (nlh == NULL)
934 goto nla_put_failure;
935
936 nfmsg = nlmsg_data(nlh);
937 nfmsg->nfgen_family = family;
938 nfmsg->version = NFNETLINK_V0;
84d7fce6 939 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 940
941 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
942 goto nla_put_failure;
943 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
944 goto nla_put_failure;
945 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
946 goto nla_put_failure;
947
948 if (chain->flags & NFT_BASE_CHAIN) {
0ca743a5 949 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 950 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 951 struct nlattr *nest;
952
953 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 954 if (nest == NULL)
955 goto nla_put_failure;
956 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
957 goto nla_put_failure;
958 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
959 goto nla_put_failure;
960 nla_nest_end(skb, nest);
9370761c 961
0ca743a5
PNA		 962 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
963 htonl(basechain->policy)))
964 goto nla_put_failure;
965
baae3e62
PM		 966 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
967 goto nla_put_failure;
0ca743a5
PNA		 968
969 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
970 goto nla_put_failure;
96518518
PM		 971 }
972
0ca743a5
PNA		 973 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
974 goto nla_put_failure;
975
053c095a
JB		 976 nlmsg_end(skb, nlh);
977 return 0;
96518518
PM		 978
979nla_put_failure:
980 nlmsg_trim(skb, nlh);
981 return -1;
982}
983
35151d84 984static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 985{
986 struct sk_buff *skb;
96518518
PM		 987 int err;
988
128ad332
PNA		 989 if (!ctx->report &&
990 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 991 return 0;
992
993 err = -ENOBUFS;
994 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
995 if (skb == NULL)
996 goto err;
997
84d7fce6
PNA		 998 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
999 event, 0, ctx->afi->family, ctx->table,
35151d84 1000 ctx->chain);
96518518
PM		 1001 if (err < 0) {
1002 kfree_skb(skb);
1003 goto err;
1004 }
1005
128ad332
PNA		 1006 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1007 ctx->report, GFP_KERNEL);
96518518 1008err:
128ad332
PNA		 1009 if (err < 0) {
1010 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1011 err);
1012 }
96518518
PM		 1013 return err;
1014}
1015
1016static int nf_tables_dump_chains(struct sk_buff *skb,
1017 struct netlink_callback *cb)
1018{
1019 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1020 const struct nft_af_info *afi;
1021 const struct nft_table *table;
1022 const struct nft_chain *chain;
1023 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1024 struct net *net = sock_net(skb->sk);
96518518
PM		 1025 int family = nfmsg->nfgen_family;
1026
e688a7f8 1027 rcu_read_lock();
38e029f1
PNA		 1028 cb->seq = net->nft.base_seq;
1029
e688a7f8 1030 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1031 if (family != NFPROTO_UNSPEC && family != afi->family)
1032 continue;
1033
e688a7f8
PNA		 1034 list_for_each_entry_rcu(table, &afi->tables, list) {
1035 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1036 if (idx < s_idx)
1037 goto cont;
1038 if (idx > s_idx)
1039 memset(&cb->args[1], 0,
1040 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6
PNA		 1041 if (nf_tables_fill_chain_info(skb, net,
1042 NETLINK_CB(cb->skb).portid,
96518518
PM		 1043 cb->nlh->nlmsg_seq,
1044 NFT_MSG_NEWCHAIN,
1045 NLM_F_MULTI,
1046 afi->family, table, chain) < 0)
1047 goto done;
38e029f1
PNA		 1048
1049 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1050cont:
1051 idx++;
1052 }
1053 }
1054 }
1055done:
e688a7f8 1056 rcu_read_unlock();
96518518
PM		 1057 cb->args[0] = idx;
1058 return skb->len;
1059}
1060
96518518
PM		 1061static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
1062 const struct nlmsghdr *nlh,
1063 const struct nlattr * const nla[])
1064{
1065 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1066 const struct nft_af_info *afi;
1067 const struct nft_table *table;
1068 const struct nft_chain *chain;
1069 struct sk_buff *skb2;
99633ab2 1070 struct net *net = sock_net(skb->sk);
96518518
PM		 1071 int family = nfmsg->nfgen_family;
1072 int err;
1073
1074 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1075 struct netlink_dump_control c = {
1076 .dump = nf_tables_dump_chains,
1077 };
1078 return netlink_dump_start(nlsk, skb, nlh, &c);
1079 }
1080
99633ab2 1081 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1082 if (IS_ERR(afi))
1083 return PTR_ERR(afi);
1084
9370761c 1085 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1086 if (IS_ERR(table))
1087 return PTR_ERR(table);
55dd6f93
PNA		 1088 if (table->flags & NFT_TABLE_INACTIVE)
1089 return -ENOENT;
96518518
PM		 1090
1091 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1092 if (IS_ERR(chain))
1093 return PTR_ERR(chain);
91c7b38d
PNA		 1094 if (chain->flags & NFT_CHAIN_INACTIVE)
1095 return -ENOENT;
96518518
PM		 1096
1097 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1098 if (!skb2)
1099 return -ENOMEM;
1100
84d7fce6 1101 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1102 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1103 family, table, chain);
1104 if (err < 0)
1105 goto err;
1106
1107 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1108
1109err:
1110 kfree_skb(skb2);
1111 return err;
1112}
1113
0ca743a5
PNA		 1114static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1115 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1116 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1117};
1118
ff3cd7b3 1119static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1120{
1121 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1122 struct nft_stats __percpu *newstats;
1123 struct nft_stats *stats;
1124 int err;
1125
1126 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1127 if (err < 0)
ff3cd7b3 1128 return ERR_PTR(err);
0ca743a5
PNA		 1129
1130 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1131 return ERR_PTR(-EINVAL);
0ca743a5 1132
ce355e20 1133 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1134 if (newstats == NULL)
ff3cd7b3 1135 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1136
1137 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1138 * are not exposed to userspace.
1139 */
e8781f70 1140 preempt_disable();
0ca743a5
PNA		 1141 stats = this_cpu_ptr(newstats);
1142 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1143 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1144 preempt_enable();
0ca743a5 1145
ff3cd7b3
PNA		 1146 return newstats;
1147}
1148
1149static void nft_chain_stats_replace(struct nft_base_chain *chain,
1150 struct nft_stats __percpu *newstats)
1151{
b88825de
PNA		 1152 if (newstats == NULL)
1153 return;
1154
0ca743a5 1155 if (chain->stats) {
0ca743a5 1156 struct nft_stats __percpu *oldstats =
67a8fc27 1157 nft_dereference(chain->stats);
0ca743a5
PNA		 1158
1159 rcu_assign_pointer(chain->stats, newstats);
1160 synchronize_rcu();
1161 free_percpu(oldstats);
1162 } else
1163 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1164}
1165
91c7b38d
PNA		 1166static void nf_tables_chain_destroy(struct nft_chain *chain)
1167{
1168 BUG_ON(chain->use > 0);
1169
1170 if (chain->flags & NFT_BASE_CHAIN) {
1171 module_put(nft_base_chain(chain)->type->owner);
1172 free_percpu(nft_base_chain(chain)->stats);
1173 kfree(nft_base_chain(chain));
1174 } else {
1175 kfree(chain);
1176 }
1177}
1178
96518518
PM		 1179static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
1180 const struct nlmsghdr *nlh,
1181 const struct nlattr * const nla[])
1182{
1183 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1184 const struct nlattr * uninitialized_var(name);
7c95f6d8 1185 struct nft_af_info *afi;
96518518
PM		 1186 struct nft_table *table;
1187 struct nft_chain *chain;
0ca743a5 1188 struct nft_base_chain *basechain = NULL;
96518518 1189 struct nlattr *ha[NFTA_HOOK_MAX + 1];
99633ab2 1190 struct net *net = sock_net(skb->sk);
96518518 1191 int family = nfmsg->nfgen_family;
57de2a0c 1192 u8 policy = NF_ACCEPT;
96518518 1193 u64 handle = 0;
115a60b1 1194 unsigned int i;
ff3cd7b3 1195 struct nft_stats __percpu *stats;
96518518
PM		 1196 int err;
1197 bool create;
91c7b38d 1198 struct nft_ctx ctx;
96518518
PM		 1199
1200 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1201
99633ab2 1202 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1203 if (IS_ERR(afi))
1204 return PTR_ERR(afi);
1205
9370761c 1206 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1207 if (IS_ERR(table))
1208 return PTR_ERR(table);
1209
96518518
PM		 1210 chain = NULL;
1211 name = nla[NFTA_CHAIN_NAME];
1212
1213 if (nla[NFTA_CHAIN_HANDLE]) {
1214 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1215 chain = nf_tables_chain_lookup_byhandle(table, handle);
1216 if (IS_ERR(chain))
1217 return PTR_ERR(chain);
1218 } else {
1219 chain = nf_tables_chain_lookup(table, name);
1220 if (IS_ERR(chain)) {
1221 if (PTR_ERR(chain) != -ENOENT)
1222 return PTR_ERR(chain);
1223 chain = NULL;
1224 }
1225 }
1226
57de2a0c
PM		 1227 if (nla[NFTA_CHAIN_POLICY]) {
1228 if ((chain != NULL &&
1229 !(chain->flags & NFT_BASE_CHAIN)) ||
1230 nla[NFTA_CHAIN_HOOK] == NULL)
1231 return -EOPNOTSUPP;
1232
8f46df18 1233 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1234 switch (policy) {
1235 case NF_DROP:
1236 case NF_ACCEPT:
1237 break;
1238 default:
1239 return -EINVAL;
1240 }
1241 }
1242
96518518 1243 if (chain != NULL) {
91c7b38d
PNA		 1244 struct nft_stats *stats = NULL;
1245 struct nft_trans *trans;
1246
1247 if (chain->flags & NFT_CHAIN_INACTIVE)
1248 return -ENOENT;
96518518
PM		 1249 if (nlh->nlmsg_flags & NLM_F_EXCL)
1250 return -EEXIST;
1251 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1252 return -EOPNOTSUPP;
1253
1254 if (nla[NFTA_CHAIN_HANDLE] && name &&
1255 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1256 return -EEXIST;
1257
0ca743a5
PNA		 1258 if (nla[NFTA_CHAIN_COUNTERS]) {
1259 if (!(chain->flags & NFT_BASE_CHAIN))
1260 return -EOPNOTSUPP;
1261
ff3cd7b3
PNA		 1262 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1263 if (IS_ERR(stats))
1264 return PTR_ERR(stats);
0ca743a5
PNA		 1265 }
1266
91c7b38d
PNA		 1267 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1268 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1269 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1270 if (trans == NULL) {
1271 free_percpu(stats);
91c7b38d 1272 return -ENOMEM;
f5553c19 1273 }
4401a862 1274
91c7b38d
PNA		 1275 nft_trans_chain_stats(trans) = stats;
1276 nft_trans_chain_update(trans) = true;
4401a862 1277
91c7b38d
PNA		 1278 if (nla[NFTA_CHAIN_POLICY])
1279 nft_trans_chain_policy(trans) = policy;
1280 else
1281 nft_trans_chain_policy(trans) = -1;
96518518 1282
91c7b38d
PNA		 1283 if (nla[NFTA_CHAIN_HANDLE] && name) {
1284 nla_strlcpy(nft_trans_chain_name(trans), name,
1285 NFT_CHAIN_MAXNAMELEN);
1286 }
1287 list_add_tail(&trans->list, &net->nft.commit_list);
1288 return 0;
96518518
PM		 1289 }
1290
75820676
PM		 1291 if (table->use == UINT_MAX)
1292 return -EOVERFLOW;
1293
96518518 1294 if (nla[NFTA_CHAIN_HOOK]) {
2a37d755 1295 const struct nf_chain_type *type;
96518518 1296 struct nf_hook_ops *ops;
9370761c 1297 nf_hookfn *hookfn;
115a60b1 1298 u32 hooknum, priority;
9370761c 1299
baae3e62 1300 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
9370761c
PNA		 1301 if (nla[NFTA_CHAIN_TYPE]) {
1302 type = nf_tables_chain_type_lookup(afi,
1303 nla[NFTA_CHAIN_TYPE],
1304 create);
93b0806f
PM		 1305 if (IS_ERR(type))
1306 return PTR_ERR(type);
9370761c 1307 }
96518518
PM		 1308
1309 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1310 nft_hook_policy);
1311 if (err < 0)
1312 return err;
1313 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1314 ha[NFTA_HOOK_PRIORITY] == NULL)
1315 return -EINVAL;
9370761c
PNA		 1316
1317 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1318 if (hooknum >= afi->nhooks)
96518518 1319 return -EINVAL;
115a60b1 1320 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
96518518 1321
baae3e62 1322 if (!(type->hook_mask & (1 << hooknum)))
9370761c 1323 return -EOPNOTSUPP;
fa2c1de0 1324 if (!try_module_get(type->owner))
baae3e62 1325 return -ENOENT;
fa2c1de0 1326 hookfn = type->hooks[hooknum];
9370761c 1327
96518518 1328 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19
PNA		 1329 if (basechain == NULL) {
1330 module_put(type->owner);
96518518 1331 return -ENOMEM;
f5553c19 1332 }
9370761c 1333
4401a862 1334 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1335 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1336 if (IS_ERR(stats)) {
fa2c1de0 1337 module_put(type->owner);
4401a862 1338 kfree(basechain);
ff3cd7b3 1339 return PTR_ERR(stats);
4401a862 1340 }
ff3cd7b3 1341 basechain->stats = stats;
4401a862 1342 } else {
ce355e20 1343 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1344 if (stats == NULL) {
fa2c1de0 1345 module_put(type->owner);
4401a862 1346 kfree(basechain);
c123bb71 1347 return -ENOMEM;
4401a862 1348 }
ff3cd7b3 1349 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1350 }
1351
9370761c 1352 basechain->type = type;
96518518
PM		 1353 chain = &basechain->chain;
1354
115a60b1
PM		 1355 for (i = 0; i < afi->nops; i++) {
1356 ops = &basechain->ops[i];
1357 ops->pf = family;
1358 ops->owner = afi->owner;
1359 ops->hooknum = hooknum;
1360 ops->priority = priority;
1361 ops->priv = chain;
1362 ops->hook = afi->hooks[ops->hooknum];
1363 if (hookfn)
1364 ops->hook = hookfn;
1365 if (afi->hook_ops_init)
1366 afi->hook_ops_init(ops, i);
1367 }
96518518
PM		 1368
1369 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1370 basechain->policy = policy;
96518518
PM		 1371 } else {
1372 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1373 if (chain == NULL)
1374 return -ENOMEM;
1375 }
1376
1377 INIT_LIST_HEAD(&chain->rules);
1378 chain->handle = nf_tables_alloc_handle(table);
0628b123 1379 chain->net = net;
b5bc89bf 1380 chain->table = table;
96518518
PM		 1381 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1382
9ddf6323
PNA		 1383 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1384 chain->flags & NFT_BASE_CHAIN) {
115a60b1 1385 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
91c7b38d
PNA		 1386 if (err < 0)
1387 goto err1;
0ca743a5 1388 }
96518518 1389
91c7b38d
PNA		 1390 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1391 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1392 if (err < 0)
1393 goto err2;
96518518 1394
4fefee57 1395 table->use++;
e688a7f8 1396 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1397 return 0;
1398err2:
c5598794 1399 nf_tables_unregister_hooks(table, chain, afi->nops);
91c7b38d
PNA		 1400err1:
1401 nf_tables_chain_destroy(chain);
1402 return err;
96518518
PM		 1403}
1404
1405static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1406 const struct nlmsghdr *nlh,
1407 const struct nlattr * const nla[])
1408{
1409 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 1410 struct nft_af_info *afi;
96518518
PM		 1411 struct nft_table *table;
1412 struct nft_chain *chain;
99633ab2 1413 struct net *net = sock_net(skb->sk);
96518518 1414 int family = nfmsg->nfgen_family;
91c7b38d 1415 struct nft_ctx ctx;
96518518 1416
99633ab2 1417 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1418 if (IS_ERR(afi))
1419 return PTR_ERR(afi);
1420
9370761c 1421 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
96518518
PM		 1422 if (IS_ERR(table))
1423 return PTR_ERR(table);
55dd6f93
PNA		 1424 if (table->flags & NFT_TABLE_INACTIVE)
1425 return -ENOENT;
96518518
PM		 1426
1427 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1428 if (IS_ERR(chain))
1429 return PTR_ERR(chain);
91c7b38d
PNA		 1430 if (chain->flags & NFT_CHAIN_INACTIVE)
1431 return -ENOENT;
4fefee57 1432 if (chain->use > 0)
96518518
PM		 1433 return -EBUSY;
1434
91c7b38d 1435 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
0165d932 1436
ee01d542 1437 return nft_delchain(&ctx);
96518518
PM		 1438}
1439
96518518
PM		 1440/*
1441 * Expressions
1442 */
1443
1444/**
ef1f7df9
PM		 1445 * nft_register_expr - register nf_tables expr type
1446 * @ops: expr type
96518518 1447 *
ef1f7df9 1448 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1449 * success or a negative errno code otherwise.
1450 */
ef1f7df9 1451int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1452{
1453 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1454 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1455 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1456 else
e688a7f8 1457 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1458 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1459 return 0;
1460}
1461EXPORT_SYMBOL_GPL(nft_register_expr);
1462
1463/**
ef1f7df9
PM		 1464 * nft_unregister_expr - unregister nf_tables expr type
1465 * @ops: expr type
96518518 1466 *
ef1f7df9 1467 * Unregisters the expr typefor use with nf_tables.
96518518 1468 */
ef1f7df9 1469void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1470{
1471 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1472 list_del_rcu(&type->list);
96518518
PM		 1473 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1474}
1475EXPORT_SYMBOL_GPL(nft_unregister_expr);
1476
64d46806
PM		 1477static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1478 struct nlattr *nla)
96518518 1479{
ef1f7df9 1480 const struct nft_expr_type *type;
96518518 1481
ef1f7df9 1482 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1483 if (!nla_strcmp(nla, type->name) &&
1484 (!type->family || type->family == family))
ef1f7df9 1485 return type;
96518518
PM		 1486 }
1487 return NULL;
1488}
1489
64d46806
PM		 1490static const struct nft_expr_type *nft_expr_type_get(u8 family,
1491 struct nlattr *nla)
96518518 1492{
ef1f7df9 1493 const struct nft_expr_type *type;
96518518
PM		 1494
1495 if (nla == NULL)
1496 return ERR_PTR(-EINVAL);
1497
64d46806 1498 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1499 if (type != NULL && try_module_get(type->owner))
1500 return type;
96518518
PM		 1501
1502#ifdef CONFIG_MODULES
ef1f7df9 1503 if (type == NULL) {
64d46806
PM		 1504 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1505 request_module("nft-expr-%u-%.*s", family,
1506 nla_len(nla), (char *)nla_data(nla));
1507 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1508 if (__nft_expr_type_get(family, nla))
1509 return ERR_PTR(-EAGAIN);
1510
96518518
PM		 1511 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1512 request_module("nft-expr-%.*s",
1513 nla_len(nla), (char *)nla_data(nla));
1514 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1515 if (__nft_expr_type_get(family, nla))
96518518
PM		 1516 return ERR_PTR(-EAGAIN);
1517 }
1518#endif
1519 return ERR_PTR(-ENOENT);
1520}
1521
1522static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1523 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1524 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1525};
1526
1527static int nf_tables_fill_expr_info(struct sk_buff *skb,
1528 const struct nft_expr *expr)
1529{
ef1f7df9 1530 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1531 goto nla_put_failure;
1532
1533 if (expr->ops->dump) {
1534 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1535 if (data == NULL)
1536 goto nla_put_failure;
1537 if (expr->ops->dump(skb, expr) < 0)
1538 goto nla_put_failure;
1539 nla_nest_end(skb, data);
1540 }
1541
1542 return skb->len;
1543
1544nla_put_failure:
1545 return -1;
1546};
1547
1548struct nft_expr_info {
1549 const struct nft_expr_ops *ops;
ef1f7df9 1550 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1551};
1552
0ca743a5
PNA		 1553static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1554 const struct nlattr *nla,
96518518
PM		 1555 struct nft_expr_info *info)
1556{
ef1f7df9 1557 const struct nft_expr_type *type;
96518518 1558 const struct nft_expr_ops *ops;
ef1f7df9 1559 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1560 int err;
1561
ef1f7df9 1562 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1563 if (err < 0)
1564 return err;
1565
64d46806 1566 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1567 if (IS_ERR(type))
1568 return PTR_ERR(type);
1569
1570 if (tb[NFTA_EXPR_DATA]) {
1571 err = nla_parse_nested(info->tb, type->maxattr,
1572 tb[NFTA_EXPR_DATA], type->policy);
1573 if (err < 0)
1574 goto err1;
1575 } else
1576 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1577
1578 if (type->select_ops != NULL) {
0ca743a5
PNA		 1579 ops = type->select_ops(ctx,
1580 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1581 if (IS_ERR(ops)) {
1582 err = PTR_ERR(ops);
1583 goto err1;
1584 }
1585 } else
1586 ops = type->ops;
1587
96518518
PM		 1588 info->ops = ops;
1589 return 0;
ef1f7df9
PM		 1590
1591err1:
1592 module_put(type->owner);
1593 return err;
96518518
PM		 1594}
1595
1596static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1597 const struct nft_expr_info *info,
96518518
PM		 1598 struct nft_expr *expr)
1599{
1600 const struct nft_expr_ops *ops = info->ops;
1601 int err;
1602
1603 expr->ops = ops;
1604 if (ops->init) {
ef1f7df9 1605 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1606 if (err < 0)
1607 goto err1;
1608 }
1609
96518518
PM		 1610 return 0;
1611
1612err1:
1613 expr->ops = NULL;
1614 return err;
1615}
1616
62472bce
PM		 1617static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1618 struct nft_expr *expr)
96518518
PM		 1619{
1620 if (expr->ops->destroy)
62472bce 1621 expr->ops->destroy(ctx, expr);
ef1f7df9 1622 module_put(expr->ops->type->owner);
96518518
PM		 1623}
1624
1625/*
1626 * Rules
1627 */
1628
1629static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1630 u64 handle)
1631{
1632 struct nft_rule *rule;
1633
1634 // FIXME: this sucks
1635 list_for_each_entry(rule, &chain->rules, list) {
1636 if (handle == rule->handle)
1637 return rule;
1638 }
1639
1640 return ERR_PTR(-ENOENT);
1641}
1642
1643static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1644 const struct nlattr *nla)
1645{
1646 if (nla == NULL)
1647 return ERR_PTR(-EINVAL);
1648
1649 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1650}
1651
1652static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1653 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1654 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1655 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1656 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1657 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1658 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1659 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1660 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1661 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1662};
1663
84d7fce6
PNA		 1664static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1665 u32 portid, u32 seq, int event,
1666 u32 flags, int family,
96518518
PM		 1667 const struct nft_table *table,
1668 const struct nft_chain *chain,
1669 const struct nft_rule *rule)
1670{
1671 struct nlmsghdr *nlh;
1672 struct nfgenmsg *nfmsg;
1673 const struct nft_expr *expr, *next;
1674 struct nlattr *list;
5e948466
EL		 1675 const struct nft_rule *prule;
1676 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1677
5e948466 1678 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1679 flags);
1680 if (nlh == NULL)
1681 goto nla_put_failure;
1682
1683 nfmsg = nlmsg_data(nlh);
1684 nfmsg->nfgen_family = family;
1685 nfmsg->version = NFNETLINK_V0;
84d7fce6 1686 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1687
1688 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1689 goto nla_put_failure;
1690 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1691 goto nla_put_failure;
1692 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1693 goto nla_put_failure;
1694
5e948466
EL		 1695 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1696 prule = list_entry(rule->list.prev, struct nft_rule, list);
1697 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1698 cpu_to_be64(prule->handle)))
1699 goto nla_put_failure;
1700 }
1701
96518518
PM		 1702 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1703 if (list == NULL)
1704 goto nla_put_failure;
1705 nft_rule_for_each_expr(expr, next, rule) {
1706 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1707 if (elem == NULL)
1708 goto nla_put_failure;
1709 if (nf_tables_fill_expr_info(skb, expr) < 0)
1710 goto nla_put_failure;
1711 nla_nest_end(skb, elem);
1712 }
1713 nla_nest_end(skb, list);
1714
86f1ec32
PM		 1715 if (rule->udata) {
1716 struct nft_userdata *udata = nft_userdata(rule);
1717 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1718 udata->data) < 0)
1719 goto nla_put_failure;
1720 }
0768b3b3 1721
053c095a
JB		 1722 nlmsg_end(skb, nlh);
1723 return 0;
96518518
PM		 1724
1725nla_put_failure:
1726 nlmsg_trim(skb, nlh);
1727 return -1;
1728}
1729
35151d84 1730static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1731 const struct nft_rule *rule,
35151d84 1732 int event)
96518518
PM		 1733{
1734 struct sk_buff *skb;
96518518
PM		 1735 int err;
1736
128ad332
PNA		 1737 if (!ctx->report &&
1738 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1739 return 0;
1740
1741 err = -ENOBUFS;
1742 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1743 if (skb == NULL)
1744 goto err;
1745
84d7fce6
PNA		 1746 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1747 event, 0, ctx->afi->family, ctx->table,
35151d84 1748 ctx->chain, rule);
96518518
PM		 1749 if (err < 0) {
1750 kfree_skb(skb);
1751 goto err;
1752 }
1753
128ad332
PNA		 1754 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1755 ctx->report, GFP_KERNEL);
96518518 1756err:
128ad332
PNA		 1757 if (err < 0) {
1758 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1759 err);
1760 }
96518518
PM		 1761 return err;
1762}
1763
1764static int nf_tables_dump_rules(struct sk_buff *skb,
1765 struct netlink_callback *cb)
1766{
1767 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1768 const struct nft_af_info *afi;
1769 const struct nft_table *table;
1770 const struct nft_chain *chain;
1771 const struct nft_rule *rule;
1772 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1773 struct net *net = sock_net(skb->sk);
96518518
PM		 1774 int family = nfmsg->nfgen_family;
1775
e688a7f8 1776 rcu_read_lock();
38e029f1
PNA		 1777 cb->seq = net->nft.base_seq;
1778
e688a7f8 1779 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1780 if (family != NFPROTO_UNSPEC && family != afi->family)
1781 continue;
1782
e688a7f8
PNA		 1783 list_for_each_entry_rcu(table, &afi->tables, list) {
1784 list_for_each_entry_rcu(chain, &table->chains, list) {
1785 list_for_each_entry_rcu(rule, &chain->rules, list) {
0628b123
PNA		 1786 if (!nft_rule_is_active(net, rule))
1787 goto cont;
96518518
PM		 1788 if (idx < s_idx)
1789 goto cont;
1790 if (idx > s_idx)
1791 memset(&cb->args[1], 0,
1792 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 1793 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 1794 cb->nlh->nlmsg_seq,
1795 NFT_MSG_NEWRULE,
1796 NLM_F_MULTI | NLM_F_APPEND,
1797 afi->family, table, chain, rule) < 0)
1798 goto done;
38e029f1
PNA		 1799
1800 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1801cont:
1802 idx++;
1803 }
1804 }
1805 }
1806 }
1807done:
e688a7f8
PNA		 1808 rcu_read_unlock();
1809
96518518
PM		 1810 cb->args[0] = idx;
1811 return skb->len;
1812}
1813
1814static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1815 const struct nlmsghdr *nlh,
1816 const struct nlattr * const nla[])
1817{
1818 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1819 const struct nft_af_info *afi;
1820 const struct nft_table *table;
1821 const struct nft_chain *chain;
1822 const struct nft_rule *rule;
1823 struct sk_buff *skb2;
99633ab2 1824 struct net *net = sock_net(skb->sk);
96518518
PM		 1825 int family = nfmsg->nfgen_family;
1826 int err;
1827
1828 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1829 struct netlink_dump_control c = {
1830 .dump = nf_tables_dump_rules,
1831 };
1832 return netlink_dump_start(nlsk, skb, nlh, &c);
1833 }
1834
99633ab2 1835 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1836 if (IS_ERR(afi))
1837 return PTR_ERR(afi);
1838
9370761c 1839 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1840 if (IS_ERR(table))
1841 return PTR_ERR(table);
55dd6f93
PNA		 1842 if (table->flags & NFT_TABLE_INACTIVE)
1843 return -ENOENT;
96518518
PM		 1844
1845 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1846 if (IS_ERR(chain))
1847 return PTR_ERR(chain);
91c7b38d
PNA		 1848 if (chain->flags & NFT_CHAIN_INACTIVE)
1849 return -ENOENT;
96518518
PM		 1850
1851 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1852 if (IS_ERR(rule))
1853 return PTR_ERR(rule);
1854
1855 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1856 if (!skb2)
1857 return -ENOMEM;
1858
84d7fce6 1859 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1860 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1861 family, table, chain, rule);
1862 if (err < 0)
1863 goto err;
1864
1865 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1866
1867err:
1868 kfree_skb(skb2);
1869 return err;
1870}
1871
62472bce
PM		 1872static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1873 struct nft_rule *rule)
96518518 1874{
96518518
PM		 1875 struct nft_expr *expr;
1876
1877 /*
1878 * Careful: some expressions might not be initialized in case this
1879 * is called on error from nf_tables_newrule().
1880 */
1881 expr = nft_expr_first(rule);
1882 while (expr->ops && expr != nft_expr_last(rule)) {
62472bce 1883 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 1884 expr = nft_expr_next(expr);
1885 }
1886 kfree(rule);
1887}
1888
1081d11b
PNA		 1889#define NFT_RULE_MAXEXPRS 128
1890
1891static struct nft_expr_info *info;
1892
96518518
PM		 1893static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1894 const struct nlmsghdr *nlh,
1895 const struct nlattr * const nla[])
1896{
1897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 1898 struct nft_af_info *afi;
99633ab2 1899 struct net *net = sock_net(skb->sk);
96518518
PM		 1900 struct nft_table *table;
1901 struct nft_chain *chain;
1902 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 1903 struct nft_userdata *udata;
1081d11b 1904 struct nft_trans *trans = NULL;
96518518
PM		 1905 struct nft_expr *expr;
1906 struct nft_ctx ctx;
1907 struct nlattr *tmp;
86f1ec32 1908 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 1909 int err, rem;
1910 bool create;
5e948466 1911 u64 handle, pos_handle;
96518518
PM		 1912
1913 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1914
99633ab2 1915 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 1916 if (IS_ERR(afi))
1917 return PTR_ERR(afi);
1918
9370761c 1919 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 1920 if (IS_ERR(table))
1921 return PTR_ERR(table);
1922
1923 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1924 if (IS_ERR(chain))
1925 return PTR_ERR(chain);
1926
1927 if (nla[NFTA_RULE_HANDLE]) {
1928 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1929 rule = __nf_tables_rule_lookup(chain, handle);
1930 if (IS_ERR(rule))
1931 return PTR_ERR(rule);
1932
1933 if (nlh->nlmsg_flags & NLM_F_EXCL)
1934 return -EEXIST;
1935 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1936 old_rule = rule;
1937 else
1938 return -EOPNOTSUPP;
1939 } else {
1940 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1941 return -EINVAL;
1942 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 1943
1944 if (chain->use == UINT_MAX)
1945 return -EOVERFLOW;
96518518
PM		 1946 }
1947
5e948466
EL		 1948 if (nla[NFTA_RULE_POSITION]) {
1949 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1950 return -EOPNOTSUPP;
1951
1952 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1953 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1954 if (IS_ERR(old_rule))
1955 return PTR_ERR(old_rule);
1956 }
1957
0ca743a5
PNA		 1958 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1959
96518518
PM		 1960 n = 0;
1961 size = 0;
1962 if (nla[NFTA_RULE_EXPRESSIONS]) {
1963 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1964 err = -EINVAL;
1965 if (nla_type(tmp) != NFTA_LIST_ELEM)
1966 goto err1;
1967 if (n == NFT_RULE_MAXEXPRS)
1968 goto err1;
0ca743a5 1969 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 1970 if (err < 0)
1971 goto err1;
1972 size += info[n].ops->size;
1973 n++;
1974 }
1975 }
9889840f
PM		 1976 /* Check for overflow of dlen field */
1977 err = -EFBIG;
1978 if (size >= 1 << 12)
1979 goto err1;
96518518 1980
86f1ec32 1981 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 1982 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 1983 if (ulen > 0)
1984 usize = sizeof(struct nft_userdata) + ulen;
1985 }
0768b3b3 1986
96518518 1987 err = -ENOMEM;
86f1ec32 1988 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 1989 if (rule == NULL)
1990 goto err1;
1991
0628b123
PNA		 1992 nft_rule_activate_next(net, rule);
1993
96518518
PM		 1994 rule->handle = handle;
1995 rule->dlen = size;
86f1ec32 1996 rule->udata = ulen ? 1 : 0;
0768b3b3 1997
86f1ec32
PM		 1998 if (ulen) {
1999 udata = nft_userdata(rule);
2000 udata->len = ulen - 1;
2001 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2002 }
96518518 2003
96518518
PM		 2004 expr = nft_expr_first(rule);
2005 for (i = 0; i < n; i++) {
2006 err = nf_tables_newexpr(&ctx, &info[i], expr);
2007 if (err < 0)
2008 goto err2;
ef1f7df9 2009 info[i].ops = NULL;
96518518
PM		 2010 expr = nft_expr_next(expr);
2011 }
2012
96518518 2013 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
0628b123 2014 if (nft_rule_is_active_next(net, old_rule)) {
ac904ac8 2015 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2016 old_rule);
1081d11b 2017 if (trans == NULL) {
0628b123
PNA		 2018 err = -ENOMEM;
2019 goto err2;
2020 }
ee01d542 2021 nft_rule_deactivate_next(net, old_rule);
ac34b861 2022 chain->use--;
5bc5c307 2023 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2024 } else {
2025 err = -ENOENT;
2026 goto err2;
2027 }
96518518 2028 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2029 if (old_rule)
2030 list_add_rcu(&rule->list, &old_rule->list);
2031 else
2032 list_add_tail_rcu(&rule->list, &chain->rules);
2033 else {
2034 if (old_rule)
2035 list_add_tail_rcu(&rule->list, &old_rule->list);
2036 else
2037 list_add_rcu(&rule->list, &chain->rules);
2038 }
96518518 2039
b380e5c7 2040 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2041 err = -ENOMEM;
2042 goto err3;
2043 }
4fefee57 2044 chain->use++;
96518518
PM		 2045 return 0;
2046
0628b123
PNA		 2047err3:
2048 list_del_rcu(&rule->list);
96518518 2049err2:
62472bce 2050 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2051err1:
2052 for (i = 0; i < n; i++) {
2053 if (info[i].ops != NULL)
ef1f7df9 2054 module_put(info[i].ops->type->owner);
96518518
PM		 2055 }
2056 return err;
2057}
2058
2059static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
2060 const struct nlmsghdr *nlh,
2061 const struct nlattr * const nla[])
2062{
2063 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8 2064 struct nft_af_info *afi;
99633ab2 2065 struct net *net = sock_net(skb->sk);
7c95f6d8 2066 struct nft_table *table;
cf9dc09d
PNA		 2067 struct nft_chain *chain = NULL;
2068 struct nft_rule *rule;
0628b123
PNA		 2069 int family = nfmsg->nfgen_family, err = 0;
2070 struct nft_ctx ctx;
96518518 2071
99633ab2 2072 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2073 if (IS_ERR(afi))
2074 return PTR_ERR(afi);
2075
9370761c 2076 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
96518518
PM		 2077 if (IS_ERR(table))
2078 return PTR_ERR(table);
55dd6f93
PNA		 2079 if (table->flags & NFT_TABLE_INACTIVE)
2080 return -ENOENT;
96518518 2081
cf9dc09d
PNA		 2082 if (nla[NFTA_RULE_CHAIN]) {
2083 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
2084 if (IS_ERR(chain))
2085 return PTR_ERR(chain);
2086 }
96518518 2087
0628b123
PNA		 2088 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
2089
cf9dc09d
PNA		 2090 if (chain) {
2091 if (nla[NFTA_RULE_HANDLE]) {
2092 rule = nf_tables_rule_lookup(chain,
2093 nla[NFTA_RULE_HANDLE]);
2094 if (IS_ERR(rule))
2095 return PTR_ERR(rule);
96518518 2096
5e266fe7 2097 err = nft_delrule(&ctx, rule);
cf9dc09d 2098 } else {
ce24b721 2099 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2100 }
2101 } else {
2102 list_for_each_entry(chain, &table->chains, list) {
2103 ctx.chain = chain;
ce24b721 2104 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2105 if (err < 0)
2106 break;
2107 }
2108 }
2109
2110 return err;
2111}
2112
20a69341
PM		 2113/*
2114 * Sets
2115 */
2116
2117static LIST_HEAD(nf_tables_set_ops);
2118
2119int nft_register_set(struct nft_set_ops *ops)
2120{
2121 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2122 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2123 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2124 return 0;
2125}
2126EXPORT_SYMBOL_GPL(nft_register_set);
2127
2128void nft_unregister_set(struct nft_set_ops *ops)
2129{
2130 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2131 list_del_rcu(&ops->list);
20a69341
PM		 2132 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2133}
2134EXPORT_SYMBOL_GPL(nft_unregister_set);
2135
c50b960c
PM		 2136/*
2137 * Select a set implementation based on the data characteristics and the
2138 * given policy. The total memory use might not be known if no size is
2139 * given, in that case the amount of memory per element is used.
2140 */
2141static const struct nft_set_ops *
2142nft_select_set_ops(const struct nlattr * const nla[],
2143 const struct nft_set_desc *desc,
2144 enum nft_set_policies policy)
20a69341 2145{
c50b960c
PM		 2146 const struct nft_set_ops *ops, *bops;
2147 struct nft_set_estimate est, best;
20a69341
PM		 2148 u32 features;
2149
2150#ifdef CONFIG_MODULES
2151 if (list_empty(&nf_tables_set_ops)) {
2152 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2153 request_module("nft-set");
2154 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2155 if (!list_empty(&nf_tables_set_ops))
2156 return ERR_PTR(-EAGAIN);
2157 }
2158#endif
2159 features = 0;
2160 if (nla[NFTA_SET_FLAGS] != NULL) {
2161 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2162 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
2163 }
2164
c50b960c
PM		 2165 bops = NULL;
2166 best.size = ~0;
2167 best.class = ~0;
2168
20a69341
PM		 2169 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2170 if ((ops->features & features) != features)
2171 continue;
c50b960c
PM		 2172 if (!ops->estimate(desc, features, &est))
2173 continue;
2174
2175 switch (policy) {
2176 case NFT_SET_POL_PERFORMANCE:
2177 if (est.class < best.class)
2178 break;
2179 if (est.class == best.class && est.size < best.size)
2180 break;
2181 continue;
2182 case NFT_SET_POL_MEMORY:
2183 if (est.size < best.size)
2184 break;
2185 if (est.size == best.size && est.class < best.class)
2186 break;
2187 continue;
2188 default:
2189 break;
2190 }
2191
20a69341
PM		 2192 if (!try_module_get(ops->owner))
2193 continue;
c50b960c
PM		 2194 if (bops != NULL)
2195 module_put(bops->owner);
2196
2197 bops = ops;
2198 best = est;
20a69341
PM		 2199 }
2200
c50b960c
PM		 2201 if (bops != NULL)
2202 return bops;
2203
20a69341
PM		 2204 return ERR_PTR(-EOPNOTSUPP);
2205}
2206
2207static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2208 [NFTA_SET_TABLE] = { .type = NLA_STRING },
a9bdd836
PNA		 2209 [NFTA_SET_NAME] = { .type = NLA_STRING,
2210 .len = IFNAMSIZ - 1 },
20a69341
PM		 2211 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2212 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2213 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2214 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2215 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2216 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2217 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2218 [NFTA_SET_ID] = { .type = NLA_U32 },
c50b960c
PM		 2219};
2220
2221static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2222 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2223};
2224
2225static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2226 const struct sk_buff *skb,
2227 const struct nlmsghdr *nlh,
2228 const struct nlattr * const nla[])
2229{
99633ab2 2230 struct net *net = sock_net(skb->sk);
20a69341 2231 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2232 struct nft_af_info *afi = NULL;
2233 struct nft_table *table = NULL;
20a69341 2234
c9c8e485
PNA		 2235 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2236 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2237 if (IS_ERR(afi))
2238 return PTR_ERR(afi);
2239 }
20a69341
PM		 2240
2241 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2242 if (afi == NULL)
2243 return -EAFNOSUPPORT;
2244
9370761c 2245 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2246 if (IS_ERR(table))
2247 return PTR_ERR(table);
55dd6f93
PNA		 2248 if (table->flags & NFT_TABLE_INACTIVE)
2249 return -ENOENT;
20a69341
PM		 2250 }
2251
0ca743a5 2252 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2253 return 0;
2254}
2255
2256struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2257 const struct nlattr *nla)
2258{
2259 struct nft_set *set;
2260
2261 if (nla == NULL)
2262 return ERR_PTR(-EINVAL);
2263
2264 list_for_each_entry(set, &table->sets, list) {
2265 if (!nla_strcmp(nla, set->name))
2266 return set;
2267 }
2268 return ERR_PTR(-ENOENT);
2269}
2270
958bee14
PNA		 2271struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2272 const struct nlattr *nla)
2273{
2274 struct nft_trans *trans;
2275 u32 id = ntohl(nla_get_be32(nla));
2276
2277 list_for_each_entry(trans, &net->nft.commit_list, list) {
2278 if (trans->msg_type == NFT_MSG_NEWSET &&
2279 id == nft_trans_set_id(trans))
2280 return nft_trans_set(trans);
2281 }
2282 return ERR_PTR(-ENOENT);
2283}
2284
20a69341
PM		 2285static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2286 const char *name)
2287{
2288 const struct nft_set *i;
2289 const char *p;
2290 unsigned long *inuse;
60eb1894 2291 unsigned int n = 0, min = 0;
20a69341
PM		 2292
2293 p = strnchr(name, IFNAMSIZ, '%');
2294 if (p != NULL) {
2295 if (p[1] != 'd' || strchr(p + 2, '%'))
2296 return -EINVAL;
2297
2298 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2299 if (inuse == NULL)
2300 return -ENOMEM;
60eb1894 2301cont:
20a69341 2302 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2303 int tmp;
2304
2305 if (!sscanf(i->name, name, &tmp))
20a69341 2306 continue;
60eb1894 2307 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2308 continue;
14662917 2309
60eb1894 2310 set_bit(tmp - min, inuse);
20a69341
PM		 2311 }
2312
53b70287 2313 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2314 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2315 min += BITS_PER_BYTE * PAGE_SIZE;
2316 memset(inuse, 0, PAGE_SIZE);
2317 goto cont;
2318 }
20a69341
PM		 2319 free_page((unsigned long)inuse);
2320 }
2321
60eb1894 2322 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341
PM		 2323 list_for_each_entry(i, &ctx->table->sets, list) {
2324 if (!strcmp(set->name, i->name))
2325 return -ENFILE;
2326 }
2327 return 0;
2328}
2329
2330static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2331 const struct nft_set *set, u16 event, u16 flags)
2332{
2333 struct nfgenmsg *nfmsg;
2334 struct nlmsghdr *nlh;
c50b960c 2335 struct nlattr *desc;
128ad332
PNA		 2336 u32 portid = ctx->portid;
2337 u32 seq = ctx->seq;
20a69341
PM		 2338
2339 event |= NFNL_SUBSYS_NFTABLES << 8;
2340 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2341 flags);
2342 if (nlh == NULL)
2343 goto nla_put_failure;
2344
2345 nfmsg = nlmsg_data(nlh);
2346 nfmsg->nfgen_family = ctx->afi->family;
2347 nfmsg->version = NFNETLINK_V0;
84d7fce6 2348 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2349
2350 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2351 goto nla_put_failure;
2352 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2353 goto nla_put_failure;
2354 if (set->flags != 0)
2355 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2356 goto nla_put_failure;
2357
2358 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2359 goto nla_put_failure;
2360 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2361 goto nla_put_failure;
2362 if (set->flags & NFT_SET_MAP) {
2363 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2364 goto nla_put_failure;
2365 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2366 goto nla_put_failure;
2367 }
2368
9363dc4b
AB		 2369 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2370 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2371 goto nla_put_failure;
2372 }
2373
c50b960c
PM		 2374 desc = nla_nest_start(skb, NFTA_SET_DESC);
2375 if (desc == NULL)
2376 goto nla_put_failure;
2377 if (set->size &&
2378 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2379 goto nla_put_failure;
2380 nla_nest_end(skb, desc);
2381
053c095a
JB		 2382 nlmsg_end(skb, nlh);
2383 return 0;
20a69341
PM		 2384
2385nla_put_failure:
2386 nlmsg_trim(skb, nlh);
2387 return -1;
2388}
2389
2390static int nf_tables_set_notify(const struct nft_ctx *ctx,
2391 const struct nft_set *set,
31f8441c 2392 int event, gfp_t gfp_flags)
20a69341
PM		 2393{
2394 struct sk_buff *skb;
128ad332 2395 u32 portid = ctx->portid;
20a69341
PM		 2396 int err;
2397
128ad332
PNA		 2398 if (!ctx->report &&
2399 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2400 return 0;
2401
2402 err = -ENOBUFS;
31f8441c 2403 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2404 if (skb == NULL)
2405 goto err;
2406
2407 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2408 if (err < 0) {
2409 kfree_skb(skb);
2410 goto err;
2411 }
2412
128ad332 2413 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2414 ctx->report, gfp_flags);
20a69341
PM		 2415err:
2416 if (err < 0)
99633ab2 2417 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2418 return err;
2419}
2420
5b96af77 2421static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2422{
2423 const struct nft_set *set;
2424 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2425 struct nft_af_info *afi;
c9c8e485
PNA		 2426 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2427 struct net *net = sock_net(skb->sk);
2428 int cur_family = cb->args[3];
5b96af77 2429 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2430
2431 if (cb->args[1])
2432 return skb->len;
2433
e688a7f8 2434 rcu_read_lock();
38e029f1
PNA		 2435 cb->seq = net->nft.base_seq;
2436
e688a7f8 2437 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2438 if (ctx->afi && ctx->afi != afi)
2439 continue;
2440
c9c8e485
PNA		 2441 if (cur_family) {
2442 if (afi->family != cur_family)
2443 continue;
2444
2445 cur_family = 0;
2446 }
e688a7f8 2447 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2448 if (ctx->table && ctx->table != table)
2449 continue;
2450
c9c8e485
PNA		 2451 if (cur_table) {
2452 if (cur_table != table)
2453 continue;
2454
2455 cur_table = NULL;
2456 }
c9c8e485 2457 idx = 0;
5b96af77 2458 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2459 if (idx < s_idx)
2460 goto cont;
5b96af77
PNA		 2461
2462 ctx_set = *ctx;
2463 ctx_set.table = table;
2464 ctx_set.afi = afi;
2465 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2466 NFT_MSG_NEWSET,
2467 NLM_F_MULTI) < 0) {
2468 cb->args[0] = idx;
2469 cb->args[2] = (unsigned long) table;
2470 cb->args[3] = afi->family;
2471 goto done;
2472 }
38e029f1 2473 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2474cont:
2475 idx++;
2476 }
2477 if (s_idx)
2478 s_idx = 0;
2479 }
2480 }
2481 cb->args[1] = 1;
2482done:
e688a7f8 2483 rcu_read_unlock();
c9c8e485
PNA		 2484 return skb->len;
2485}
2486
5b96af77 2487static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2488{
5b96af77
PNA		 2489 kfree(cb->data);
2490 return 0;
20a69341
PM		 2491}
2492
2493static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2494 const struct nlmsghdr *nlh,
2495 const struct nlattr * const nla[])
2496{
2497 const struct nft_set *set;
2498 struct nft_ctx ctx;
2499 struct sk_buff *skb2;
c9c8e485 2500 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2501 int err;
2502
01cfa0a4 2503 /* Verify existence before starting dump */
20a69341
PM		 2504 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2505 if (err < 0)
2506 return err;
2507
2508 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2509 struct netlink_dump_control c = {
2510 .dump = nf_tables_dump_sets,
5b96af77 2511 .done = nf_tables_dump_sets_done,
20a69341 2512 };
5b96af77
PNA		 2513 struct nft_ctx *ctx_dump;
2514
2515 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2516 if (ctx_dump == NULL)
2517 return -ENOMEM;
2518
2519 *ctx_dump = ctx;
2520 c.data = ctx_dump;
2521
20a69341
PM		 2522 return netlink_dump_start(nlsk, skb, nlh, &c);
2523 }
2524
c9c8e485
PNA		 2525 /* Only accept unspec with dump */
2526 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2527 return -EAFNOSUPPORT;
2528
20a69341
PM		 2529 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2530 if (IS_ERR(set))
2531 return PTR_ERR(set);
958bee14
PNA		 2532 if (set->flags & NFT_SET_INACTIVE)
2533 return -ENOENT;
20a69341
PM		 2534
2535 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2536 if (skb2 == NULL)
2537 return -ENOMEM;
2538
2539 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2540 if (err < 0)
2541 goto err;
2542
2543 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2544
2545err:
2546 kfree_skb(skb2);
2547 return err;
2548}
2549
c50b960c
PM		 2550static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2551 struct nft_set_desc *desc,
2552 const struct nlattr *nla)
2553{
2554 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2555 int err;
2556
2557 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2558 if (err < 0)
2559 return err;
2560
2561 if (da[NFTA_SET_DESC_SIZE] != NULL)
2562 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2563
2564 return 0;
2565}
2566
20a69341
PM		 2567static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2568 const struct nlmsghdr *nlh,
2569 const struct nlattr * const nla[])
2570{
2571 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2572 const struct nft_set_ops *ops;
7c95f6d8 2573 struct nft_af_info *afi;
99633ab2 2574 struct net *net = sock_net(skb->sk);
20a69341
PM		 2575 struct nft_table *table;
2576 struct nft_set *set;
2577 struct nft_ctx ctx;
2578 char name[IFNAMSIZ];
2579 unsigned int size;
2580 bool create;
c50b960c
PM		 2581 u32 ktype, dtype, flags, policy;
2582 struct nft_set_desc desc;
20a69341
PM		 2583 int err;
2584
2585 if (nla[NFTA_SET_TABLE] == NULL ||
2586 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2587 nla[NFTA_SET_KEY_LEN] == NULL ||
2588 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2589 return -EINVAL;
2590
c50b960c
PM		 2591 memset(&desc, 0, sizeof(desc));
2592
20a69341
PM		 2593 ktype = NFT_DATA_VALUE;
2594 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2595 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2596 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2597 return -EINVAL;
2598 }
2599
c50b960c
PM		 2600 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2601 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
20a69341
PM		 2602 return -EINVAL;
2603
2604 flags = 0;
2605 if (nla[NFTA_SET_FLAGS] != NULL) {
2606 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2607 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2608 NFT_SET_INTERVAL | NFT_SET_MAP))
2609 return -EINVAL;
2610 }
2611
2612 dtype = 0;
20a69341
PM		 2613 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2614 if (!(flags & NFT_SET_MAP))
2615 return -EINVAL;
2616
2617 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2618 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2619 dtype != NFT_DATA_VERDICT)
2620 return -EINVAL;
2621
2622 if (dtype != NFT_DATA_VERDICT) {
2623 if (nla[NFTA_SET_DATA_LEN] == NULL)
2624 return -EINVAL;
c50b960c
PM		 2625 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2626 if (desc.dlen == 0 ||
2627 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
20a69341
PM		 2628 return -EINVAL;
2629 } else
c50b960c 2630 desc.dlen = sizeof(struct nft_data);
20a69341
PM		 2631 } else if (flags & NFT_SET_MAP)
2632 return -EINVAL;
2633
c50b960c
PM		 2634 policy = NFT_SET_POL_PERFORMANCE;
2635 if (nla[NFTA_SET_POLICY] != NULL)
2636 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2637
2638 if (nla[NFTA_SET_DESC] != NULL) {
2639 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2640 if (err < 0)
2641 return err;
2642 }
2643
20a69341
PM		 2644 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2645
99633ab2 2646 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2647 if (IS_ERR(afi))
2648 return PTR_ERR(afi);
2649
9370761c 2650 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
20a69341
PM		 2651 if (IS_ERR(table))
2652 return PTR_ERR(table);
2653
0ca743a5 2654 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2655
2656 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2657 if (IS_ERR(set)) {
2658 if (PTR_ERR(set) != -ENOENT)
2659 return PTR_ERR(set);
2660 set = NULL;
2661 }
2662
2663 if (set != NULL) {
2664 if (nlh->nlmsg_flags & NLM_F_EXCL)
2665 return -EEXIST;
2666 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2667 return -EOPNOTSUPP;
2668 return 0;
2669 }
2670
2671 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2672 return -ENOENT;
2673
c50b960c 2674 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 2675 if (IS_ERR(ops))
2676 return PTR_ERR(ops);
2677
2678 size = 0;
2679 if (ops->privsize != NULL)
2680 size = ops->privsize(nla);
2681
2682 err = -ENOMEM;
2683 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2684 if (set == NULL)
2685 goto err1;
2686
2687 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2688 err = nf_tables_set_alloc_name(&ctx, set, name);
2689 if (err < 0)
2690 goto err2;
2691
2692 INIT_LIST_HEAD(&set->bindings);
2693 set->ops = ops;
2694 set->ktype = ktype;
c50b960c 2695 set->klen = desc.klen;
20a69341 2696 set->dtype = dtype;
c50b960c 2697 set->dlen = desc.dlen;
20a69341 2698 set->flags = flags;
c50b960c 2699 set->size = desc.size;
9363dc4b 2700 set->policy = policy;
20a69341 2701
c50b960c 2702 err = ops->init(set, &desc, nla);
20a69341
PM		 2703 if (err < 0)
2704 goto err2;
2705
958bee14 2706 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341
PM		 2707 if (err < 0)
2708 goto err2;
2709
e688a7f8 2710 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 2711 table->use++;
20a69341
PM		 2712 return 0;
2713
2714err2:
2715 kfree(set);
2716err1:
2717 module_put(ops->owner);
2718 return err;
2719}
2720
958bee14 2721static void nft_set_destroy(struct nft_set *set)
20a69341 2722{
20a69341
PM		 2723 set->ops->destroy(set);
2724 module_put(set->ops->owner);
2725 kfree(set);
2726}
2727
958bee14
PNA		 2728static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2729{
e688a7f8 2730 list_del_rcu(&set->list);
31f8441c 2731 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 2732 nft_set_destroy(set);
2733}
2734
20a69341
PM		 2735static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2736 const struct nlmsghdr *nlh,
2737 const struct nlattr * const nla[])
2738{
c9c8e485 2739 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2740 struct nft_set *set;
2741 struct nft_ctx ctx;
2742 int err;
2743
ec2c9935
PM		 2744 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2745 return -EAFNOSUPPORT;
20a69341
PM		 2746 if (nla[NFTA_SET_TABLE] == NULL)
2747 return -EINVAL;
2748
2749 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2750 if (err < 0)
2751 return err;
2752
2753 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2754 if (IS_ERR(set))
2755 return PTR_ERR(set);
958bee14
PNA		 2756 if (set->flags & NFT_SET_INACTIVE)
2757 return -ENOENT;
20a69341
PM		 2758 if (!list_empty(&set->bindings))
2759 return -EBUSY;
2760
ee01d542 2761 return nft_delset(&ctx, set);
20a69341
PM		 2762}
2763
2764static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2765 const struct nft_set *set,
2766 const struct nft_set_iter *iter,
2767 const struct nft_set_elem *elem)
2768{
2769 enum nft_registers dreg;
2770
2771 dreg = nft_type_to_reg(set->dtype);
2ee0d3c8
PNA		 2772 return nft_validate_data_load(ctx, dreg, &elem->data,
2773 set->dtype == NFT_DATA_VERDICT ?
2774 NFT_DATA_VERDICT : NFT_DATA_VALUE);
20a69341
PM		 2775}
2776
2777int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2778 struct nft_set_binding *binding)
2779{
2780 struct nft_set_binding *i;
2781 struct nft_set_iter iter;
2782
2783 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2784 return -EBUSY;
2785
2786 if (set->flags & NFT_SET_MAP) {
2787 /* If the set is already bound to the same chain all
2788 * jumps are already validated for that chain.
2789 */
2790 list_for_each_entry(i, &set->bindings, list) {
2791 if (i->chain == binding->chain)
2792 goto bind;
2793 }
2794
2795 iter.skip = 0;
2796 iter.count = 0;
2797 iter.err = 0;
2798 iter.fn = nf_tables_bind_check_setelem;
2799
2800 set->ops->walk(ctx, set, &iter);
2801 if (iter.err < 0) {
2802 /* Destroy anonymous sets if binding fails */
2803 if (set->flags & NFT_SET_ANONYMOUS)
2804 nf_tables_set_destroy(ctx, set);
2805
2806 return iter.err;
2807 }
2808 }
2809bind:
2810 binding->chain = ctx->chain;
e688a7f8 2811 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 2812 return 0;
2813}
2814
2815void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2816 struct nft_set_binding *binding)
2817{
e688a7f8 2818 list_del_rcu(&binding->list);
20a69341 2819
958bee14
PNA		 2820 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2821 !(set->flags & NFT_SET_INACTIVE))
20a69341
PM		 2822 nf_tables_set_destroy(ctx, set);
2823}
2824
2825/*
2826 * Set elements
2827 */
2828
2829static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2830 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2831 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2832 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2833};
2834
2835static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2836 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2837 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2838 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 2839 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 2840};
2841
2842static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2843 const struct sk_buff *skb,
2844 const struct nlmsghdr *nlh,
55dd6f93
PNA		 2845 const struct nlattr * const nla[],
2846 bool trans)
20a69341
PM		 2847{
2848 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2849 struct nft_af_info *afi;
2850 struct nft_table *table;
99633ab2 2851 struct net *net = sock_net(skb->sk);
20a69341 2852
99633ab2 2853 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 2854 if (IS_ERR(afi))
2855 return PTR_ERR(afi);
2856
9370761c 2857 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341
PM		 2858 if (IS_ERR(table))
2859 return PTR_ERR(table);
55dd6f93
PNA		 2860 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2861 return -ENOENT;
20a69341 2862
0ca743a5 2863 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2864 return 0;
2865}
2866
2867static int nf_tables_fill_setelem(struct sk_buff *skb,
2868 const struct nft_set *set,
2869 const struct nft_set_elem *elem)
2870{
2871 unsigned char *b = skb_tail_pointer(skb);
2872 struct nlattr *nest;
2873
2874 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2875 if (nest == NULL)
2876 goto nla_put_failure;
2877
2878 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2879 set->klen) < 0)
2880 goto nla_put_failure;
2881
2882 if (set->flags & NFT_SET_MAP &&
2883 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2884 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2885 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2886 set->dlen) < 0)
2887 goto nla_put_failure;
2888
2889 if (elem->flags != 0)
2890 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2891 goto nla_put_failure;
2892
2893 nla_nest_end(skb, nest);
2894 return 0;
2895
2896nla_put_failure:
2897 nlmsg_trim(skb, b);
2898 return -EMSGSIZE;
2899}
2900
2901struct nft_set_dump_args {
2902 const struct netlink_callback *cb;
2903 struct nft_set_iter iter;
2904 struct sk_buff *skb;
2905};
2906
2907static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2908 const struct nft_set *set,
2909 const struct nft_set_iter *iter,
2910 const struct nft_set_elem *elem)
2911{
2912 struct nft_set_dump_args *args;
2913
2914 args = container_of(iter, struct nft_set_dump_args, iter);
2915 return nf_tables_fill_setelem(args->skb, set, elem);
2916}
2917
2918static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2919{
2920 const struct nft_set *set;
2921 struct nft_set_dump_args args;
2922 struct nft_ctx ctx;
2923 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2924 struct nfgenmsg *nfmsg;
2925 struct nlmsghdr *nlh;
2926 struct nlattr *nest;
2927 u32 portid, seq;
2928 int event, err;
2929
720e0dfa
MN		 2930 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2931 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 2932 if (err < 0)
2933 return err;
2934
55dd6f93
PNA		 2935 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2936 false);
20a69341
PM		 2937 if (err < 0)
2938 return err;
2939
2940 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2941 if (IS_ERR(set))
2942 return PTR_ERR(set);
958bee14
PNA		 2943 if (set->flags & NFT_SET_INACTIVE)
2944 return -ENOENT;
20a69341
PM		 2945
2946 event = NFT_MSG_NEWSETELEM;
2947 event |= NFNL_SUBSYS_NFTABLES << 8;
2948 portid = NETLINK_CB(cb->skb).portid;
2949 seq = cb->nlh->nlmsg_seq;
2950
2951 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2952 NLM_F_MULTI);
2953 if (nlh == NULL)
2954 goto nla_put_failure;
2955
2956 nfmsg = nlmsg_data(nlh);
6403d962 2957 nfmsg->nfgen_family = ctx.afi->family;
20a69341 2958 nfmsg->version = NFNETLINK_V0;
84d7fce6 2959 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 2960
2961 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2962 goto nla_put_failure;
2963 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2964 goto nla_put_failure;
2965
2966 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2967 if (nest == NULL)
2968 goto nla_put_failure;
2969
2970 args.cb = cb;
2971 args.skb = skb;
2972 args.iter.skip = cb->args[0];
2973 args.iter.count = 0;
2974 args.iter.err = 0;
2975 args.iter.fn = nf_tables_dump_setelem;
2976 set->ops->walk(&ctx, set, &args.iter);
2977
2978 nla_nest_end(skb, nest);
2979 nlmsg_end(skb, nlh);
2980
2981 if (args.iter.err && args.iter.err != -EMSGSIZE)
2982 return args.iter.err;
2983 if (args.iter.count == cb->args[0])
2984 return 0;
2985
2986 cb->args[0] = args.iter.count;
2987 return skb->len;
2988
2989nla_put_failure:
2990 return -ENOSPC;
2991}
2992
2993static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2994 const struct nlmsghdr *nlh,
2995 const struct nlattr * const nla[])
2996{
2997 const struct nft_set *set;
2998 struct nft_ctx ctx;
2999 int err;
3000
55dd6f93 3001 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
20a69341
PM		 3002 if (err < 0)
3003 return err;
3004
3005 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3006 if (IS_ERR(set))
3007 return PTR_ERR(set);
958bee14
PNA		 3008 if (set->flags & NFT_SET_INACTIVE)
3009 return -ENOENT;
20a69341
PM		 3010
3011 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3012 struct netlink_dump_control c = {
3013 .dump = nf_tables_dump_set,
3014 };
3015 return netlink_dump_start(nlsk, skb, nlh, &c);
3016 }
3017 return -EOPNOTSUPP;
3018}
3019
d60ce62f
AB		 3020static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3021 const struct nft_ctx *ctx, u32 seq,
3022 u32 portid, int event, u16 flags,
3023 const struct nft_set *set,
3024 const struct nft_set_elem *elem)
3025{
3026 struct nfgenmsg *nfmsg;
3027 struct nlmsghdr *nlh;
3028 struct nlattr *nest;
3029 int err;
3030
3031 event |= NFNL_SUBSYS_NFTABLES << 8;
3032 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3033 flags);
3034 if (nlh == NULL)
3035 goto nla_put_failure;
3036
3037 nfmsg = nlmsg_data(nlh);
3038 nfmsg->nfgen_family = ctx->afi->family;
3039 nfmsg->version = NFNETLINK_V0;
84d7fce6 3040 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3041
3042 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3043 goto nla_put_failure;
3044 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3045 goto nla_put_failure;
3046
3047 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3048 if (nest == NULL)
3049 goto nla_put_failure;
3050
3051 err = nf_tables_fill_setelem(skb, set, elem);
3052 if (err < 0)
3053 goto nla_put_failure;
3054
3055 nla_nest_end(skb, nest);
3056
053c095a
JB		 3057 nlmsg_end(skb, nlh);
3058 return 0;
d60ce62f
AB		 3059
3060nla_put_failure:
3061 nlmsg_trim(skb, nlh);
3062 return -1;
3063}
3064
3065static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3066 const struct nft_set *set,
3067 const struct nft_set_elem *elem,
3068 int event, u16 flags)
3069{
128ad332
PNA		 3070 struct net *net = ctx->net;
3071 u32 portid = ctx->portid;
d60ce62f
AB		 3072 struct sk_buff *skb;
3073 int err;
3074
128ad332 3075 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3076 return 0;
3077
3078 err = -ENOBUFS;
3079 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3080 if (skb == NULL)
3081 goto err;
3082
3083 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3084 set, elem);
3085 if (err < 0) {
3086 kfree_skb(skb);
3087 goto err;
3088 }
3089
128ad332 3090 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3091 GFP_KERNEL);
3092err:
3093 if (err < 0)
3094 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3095 return err;
3096}
3097
60319eb1
PNA		 3098static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3099 int msg_type,
3100 struct nft_set *set)
3101{
3102 struct nft_trans *trans;
3103
3104 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3105 if (trans == NULL)
3106 return NULL;
3107
3108 nft_trans_elem_set(trans) = set;
3109 return trans;
3110}
3111
3112static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3113 const struct nlattr *attr)
3114{
3115 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3116 struct nft_data_desc d1, d2;
3117 struct nft_set_elem elem;
3118 struct nft_set_binding *binding;
3119 enum nft_registers dreg;
60319eb1 3120 struct nft_trans *trans;
20a69341
PM		 3121 int err;
3122
c50b960c
PM		 3123 if (set->size && set->nelems == set->size)
3124 return -ENFILE;
3125
20a69341
PM		 3126 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3127 nft_set_elem_policy);
3128 if (err < 0)
3129 return err;
3130
3131 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3132 return -EINVAL;
3133
3134 elem.flags = 0;
3135 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3136 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3137 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3138 return -EINVAL;
3139 }
3140
3141 if (set->flags & NFT_SET_MAP) {
3142 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3143 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3144 return -EINVAL;
bd7fc645
PNA		 3145 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3146 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3147 return -EINVAL;
20a69341
PM		 3148 } else {
3149 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3150 return -EINVAL;
3151 }
3152
3153 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3154 if (err < 0)
3155 goto err1;
3156 err = -EINVAL;
3157 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3158 goto err2;
3159
3160 err = -EEXIST;
3161 if (set->ops->get(set, &elem) == 0)
3162 goto err2;
3163
3164 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3165 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3166 if (err < 0)
3167 goto err2;
3168
3169 err = -EINVAL;
3170 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3171 goto err3;
3172
3173 dreg = nft_type_to_reg(set->dtype);
3174 list_for_each_entry(binding, &set->bindings, list) {
3175 struct nft_ctx bind_ctx = {
3176 .afi = ctx->afi,
3177 .table = ctx->table,
7c95f6d8 3178 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3179 };
3180
3181 err = nft_validate_data_load(&bind_ctx, dreg,
3182 &elem.data, d2.type);
3183 if (err < 0)
3184 goto err3;
3185 }
3186 }
3187
60319eb1
PNA		 3188 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3189 if (trans == NULL)
3190 goto err3;
3191
20a69341
PM		 3192 err = set->ops->insert(set, &elem);
3193 if (err < 0)
60319eb1 3194 goto err4;
20a69341 3195
60319eb1 3196 nft_trans_elem(trans) = elem;
46bbafce 3197 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3198 return 0;
3199
60319eb1
PNA		 3200err4:
3201 kfree(trans);
20a69341
PM		 3202err3:
3203 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3204 nft_data_uninit(&elem.data, d2.type);
3205err2:
3206 nft_data_uninit(&elem.key, d1.type);
3207err1:
3208 return err;
3209}
3210
3211static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3212 const struct nlmsghdr *nlh,
3213 const struct nlattr * const nla[])
3214{
958bee14 3215 struct net *net = sock_net(skb->sk);
20a69341
PM		 3216 const struct nlattr *attr;
3217 struct nft_set *set;
3218 struct nft_ctx ctx;
60319eb1 3219 int rem, err = 0;
20a69341 3220
7d5570ca
PNA		 3221 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3222 return -EINVAL;
3223
55dd6f93 3224 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
20a69341
PM		 3225 if (err < 0)
3226 return err;
3227
3228 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
958bee14
PNA		 3229 if (IS_ERR(set)) {
3230 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3231 set = nf_tables_set_lookup_byid(net,
3232 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3233 }
3234 if (IS_ERR(set))
3235 return PTR_ERR(set);
3236 }
3237
20a69341
PM		 3238 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3239 return -EBUSY;
3240
3241 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3242 err = nft_add_set_elem(&ctx, set, attr);
3243 if (err < 0)
60319eb1 3244 break;
4fefee57
PNA		 3245
3246 set->nelems++;
20a69341 3247 }
60319eb1 3248 return err;
20a69341
PM		 3249}
3250
60319eb1 3251static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3252 const struct nlattr *attr)
3253{
3254 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3255 struct nft_data_desc desc;
3256 struct nft_set_elem elem;
60319eb1 3257 struct nft_trans *trans;
20a69341
PM		 3258 int err;
3259
3260 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3261 nft_set_elem_policy);
3262 if (err < 0)
3263 goto err1;
3264
3265 err = -EINVAL;
3266 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3267 goto err1;
3268
3269 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3270 if (err < 0)
3271 goto err1;
3272
3273 err = -EINVAL;
3274 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3275 goto err2;
3276
3277 err = set->ops->get(set, &elem);
3278 if (err < 0)
3279 goto err2;
3280
60319eb1 3281 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3282 if (trans == NULL) {
3283 err = -ENOMEM;
60319eb1 3284 goto err2;
609ccf08 3285 }
20a69341 3286
60319eb1 3287 nft_trans_elem(trans) = elem;
46bbafce 3288 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3289 return 0;
20a69341
PM		 3290err2:
3291 nft_data_uninit(&elem.key, desc.type);
3292err1:
3293 return err;
3294}
3295
3296static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3297 const struct nlmsghdr *nlh,
3298 const struct nlattr * const nla[])
3299{
3300 const struct nlattr *attr;
3301 struct nft_set *set;
3302 struct nft_ctx ctx;
60319eb1 3303 int rem, err = 0;
20a69341 3304
7d5570ca
PNA		 3305 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3306 return -EINVAL;
3307
55dd6f93 3308 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
20a69341
PM		 3309 if (err < 0)
3310 return err;
3311
3312 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3313 if (IS_ERR(set))
3314 return PTR_ERR(set);
3315 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3316 return -EBUSY;
3317
3318 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3319 err = nft_del_setelem(&ctx, set, attr);
3320 if (err < 0)
60319eb1 3321 break;
4fefee57
PNA		 3322
3323 set->nelems--;
20a69341 3324 }
60319eb1 3325 return err;
20a69341
PM		 3326}
3327
84d7fce6
PNA		 3328static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
3329 u32 portid, u32 seq)
3330{
3331 struct nlmsghdr *nlh;
3332 struct nfgenmsg *nfmsg;
3333 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
3334
3335 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
3336 if (nlh == NULL)
3337 goto nla_put_failure;
3338
3339 nfmsg = nlmsg_data(nlh);
3340 nfmsg->nfgen_family = AF_UNSPEC;
3341 nfmsg->version = NFNETLINK_V0;
3342 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3343
3344 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
3345 goto nla_put_failure;
3346
053c095a
JB		 3347 nlmsg_end(skb, nlh);
3348 return 0;
84d7fce6
PNA		 3349
3350nla_put_failure:
3351 nlmsg_trim(skb, nlh);
3352 return -EMSGSIZE;
3353}
3354
3355static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
3356{
3357 struct nlmsghdr *nlh = nlmsg_hdr(skb);
3358 struct sk_buff *skb2;
3359 int err;
3360
3361 if (nlmsg_report(nlh) &&
3362 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3363 return 0;
3364
3365 err = -ENOBUFS;
3366 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3367 if (skb2 == NULL)
3368 goto err;
3369
3370 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3371 nlh->nlmsg_seq);
3372 if (err < 0) {
3373 kfree_skb(skb2);
3374 goto err;
3375 }
3376
3377 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
3378 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
3379err:
3380 if (err < 0) {
3381 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
3382 err);
3383 }
3384 return err;
3385}
3386
3387static int nf_tables_getgen(struct sock *nlsk, struct sk_buff *skb,
3388 const struct nlmsghdr *nlh,
3389 const struct nlattr * const nla[])
3390{
3391 struct net *net = sock_net(skb->sk);
3392 struct sk_buff *skb2;
3393 int err;
3394
3395 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3396 if (skb2 == NULL)
3397 return -ENOMEM;
3398
3399 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
3400 nlh->nlmsg_seq);
3401 if (err < 0)
3402 goto err;
3403
3404 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3405err:
3406 kfree_skb(skb2);
3407 return err;
3408}
3409
96518518
PM		 3410static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3411 [NFT_MSG_NEWTABLE] = {
55dd6f93 3412 .call_batch = nf_tables_newtable,
96518518
PM		 3413 .attr_count = NFTA_TABLE_MAX,
3414 .policy = nft_table_policy,
3415 },
3416 [NFT_MSG_GETTABLE] = {
3417 .call = nf_tables_gettable,
3418 .attr_count = NFTA_TABLE_MAX,
3419 .policy = nft_table_policy,
3420 },
3421 [NFT_MSG_DELTABLE] = {
55dd6f93 3422 .call_batch = nf_tables_deltable,
96518518
PM		 3423 .attr_count = NFTA_TABLE_MAX,
3424 .policy = nft_table_policy,
3425 },
3426 [NFT_MSG_NEWCHAIN] = {
91c7b38d 3427 .call_batch = nf_tables_newchain,
96518518
PM		 3428 .attr_count = NFTA_CHAIN_MAX,
3429 .policy = nft_chain_policy,
3430 },
3431 [NFT_MSG_GETCHAIN] = {
3432 .call = nf_tables_getchain,
3433 .attr_count = NFTA_CHAIN_MAX,
3434 .policy = nft_chain_policy,
3435 },
3436 [NFT_MSG_DELCHAIN] = {
91c7b38d 3437 .call_batch = nf_tables_delchain,
96518518
PM		 3438 .attr_count = NFTA_CHAIN_MAX,
3439 .policy = nft_chain_policy,
3440 },
3441 [NFT_MSG_NEWRULE] = {
0628b123 3442 .call_batch = nf_tables_newrule,
96518518
PM		 3443 .attr_count = NFTA_RULE_MAX,
3444 .policy = nft_rule_policy,
3445 },
3446 [NFT_MSG_GETRULE] = {
3447 .call = nf_tables_getrule,
3448 .attr_count = NFTA_RULE_MAX,
3449 .policy = nft_rule_policy,
3450 },
3451 [NFT_MSG_DELRULE] = {
0628b123 3452 .call_batch = nf_tables_delrule,
96518518
PM		 3453 .attr_count = NFTA_RULE_MAX,
3454 .policy = nft_rule_policy,
3455 },
20a69341 3456 [NFT_MSG_NEWSET] = {
958bee14 3457 .call_batch = nf_tables_newset,
20a69341
PM		 3458 .attr_count = NFTA_SET_MAX,
3459 .policy = nft_set_policy,
3460 },
3461 [NFT_MSG_GETSET] = {
3462 .call = nf_tables_getset,
3463 .attr_count = NFTA_SET_MAX,
3464 .policy = nft_set_policy,
3465 },
3466 [NFT_MSG_DELSET] = {
958bee14 3467 .call_batch = nf_tables_delset,
20a69341
PM		 3468 .attr_count = NFTA_SET_MAX,
3469 .policy = nft_set_policy,
3470 },
3471 [NFT_MSG_NEWSETELEM] = {
958bee14 3472 .call_batch = nf_tables_newsetelem,
20a69341
PM		 3473 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3474 .policy = nft_set_elem_list_policy,
3475 },
3476 [NFT_MSG_GETSETELEM] = {
3477 .call = nf_tables_getsetelem,
3478 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3479 .policy = nft_set_elem_list_policy,
3480 },
3481 [NFT_MSG_DELSETELEM] = {
958bee14 3482 .call_batch = nf_tables_delsetelem,
20a69341
PM		 3483 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3484 .policy = nft_set_elem_list_policy,
3485 },
84d7fce6
PNA		 3486 [NFT_MSG_GETGEN] = {
3487 .call = nf_tables_getgen,
3488 },
96518518
PM		 3489};
3490
91c7b38d
PNA		 3491static void nft_chain_commit_update(struct nft_trans *trans)
3492{
3493 struct nft_base_chain *basechain;
3494
3495 if (nft_trans_chain_name(trans)[0])
3496 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3497
3498 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3499 return;
3500
3501 basechain = nft_base_chain(trans->ctx.chain);
3502 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3503
3504 switch (nft_trans_chain_policy(trans)) {
3505 case NF_DROP:
3506 case NF_ACCEPT:
3507 basechain->policy = nft_trans_chain_policy(trans);
3508 break;
3509 }
3510}
3511
b326dd37 3512static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 3513{
c7c32e72
PNA		 3514 switch (trans->msg_type) {
3515 case NFT_MSG_DELTABLE:
3516 nf_tables_table_destroy(&trans->ctx);
3517 break;
3518 case NFT_MSG_DELCHAIN:
3519 nf_tables_chain_destroy(trans->ctx.chain);
3520 break;
3521 case NFT_MSG_DELRULE:
3522 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3523 break;
3524 case NFT_MSG_DELSET:
3525 nft_set_destroy(nft_trans_set(trans));
3526 break;
3527 }
3528 kfree(trans);
3529}
3530
37082f93
PNA		 3531static int nf_tables_commit(struct sk_buff *skb)
3532{
3533 struct net *net = sock_net(skb->sk);
3534 struct nft_trans *trans, *next;
a3716e70 3535 struct nft_trans_elem *te;
37082f93
PNA		 3536
3537 /* Bump generation counter, invalidate any dump in progress */
38e029f1 3538 while (++net->nft.base_seq == 0);
37082f93
PNA		 3539
3540 /* A new generation has just started */
3541 net->nft.gencursor = gencursor_next(net);
3542
3543 /* Make sure all packets have left the previous generation before
3544 * purging old rules.
3545 */
3546 synchronize_rcu();
3547
3548 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3549 switch (trans->msg_type) {
55dd6f93
PNA		 3550 case NFT_MSG_NEWTABLE:
3551 if (nft_trans_table_update(trans)) {
3552 if (!nft_trans_table_enable(trans)) {
3553 nf_tables_table_disable(trans->ctx.afi,
3554 trans->ctx.table);
3555 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3556 }
3557 } else {
3558 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3559 }
35151d84 3560 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 3561 nft_trans_destroy(trans);
3562 break;
3563 case NFT_MSG_DELTABLE:
35151d84 3564 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 3565 break;
91c7b38d
PNA		 3566 case NFT_MSG_NEWCHAIN:
3567 if (nft_trans_chain_update(trans))
3568 nft_chain_commit_update(trans);
4fefee57 3569 else
91c7b38d 3570 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
4fefee57 3571
35151d84 3572 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 3573 nft_trans_destroy(trans);
3574 break;
3575 case NFT_MSG_DELCHAIN:
35151d84 3576 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c5598794
AB		 3577 nf_tables_unregister_hooks(trans->ctx.table,
3578 trans->ctx.chain,
3579 trans->ctx.afi->nops);
91c7b38d 3580 break;
b380e5c7
PNA		 3581 case NFT_MSG_NEWRULE:
3582 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 3583 nf_tables_rule_notify(&trans->ctx,
37082f93 3584 nft_trans_rule(trans),
35151d84 3585 NFT_MSG_NEWRULE);
37082f93 3586 nft_trans_destroy(trans);
b380e5c7
PNA		 3587 break;
3588 case NFT_MSG_DELRULE:
3589 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 3590 nf_tables_rule_notify(&trans->ctx,
3591 nft_trans_rule(trans),
3592 NFT_MSG_DELRULE);
b380e5c7 3593 break;
958bee14
PNA		 3594 case NFT_MSG_NEWSET:
3595 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
4fefee57
PNA		 3596 /* This avoids hitting -EBUSY when deleting the table
3597 * from the transaction.
3598 */
3599 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3600 !list_empty(&nft_trans_set(trans)->bindings))
3601 trans->ctx.table->use--;
3602
958bee14 3603 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 3604 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 3605 nft_trans_destroy(trans);
3606 break;
3607 case NFT_MSG_DELSET:
3608 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 3609 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 3610 break;
60319eb1 3611 case NFT_MSG_NEWSETELEM:
60319eb1
PNA		 3612 nf_tables_setelem_notify(&trans->ctx,
3613 nft_trans_elem_set(trans),
3614 &nft_trans_elem(trans),
3615 NFT_MSG_NEWSETELEM, 0);
3616 nft_trans_destroy(trans);
3617 break;
3618 case NFT_MSG_DELSETELEM:
a3716e70
PNA		 3619 te = (struct nft_trans_elem *)trans->data;
3620 nf_tables_setelem_notify(&trans->ctx, te->set,
3621 &te->elem,
60319eb1 3622 NFT_MSG_DELSETELEM, 0);
a3716e70 3623 te->set->ops->get(te->set, &te->elem);
a3716e70 3624 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
02263db0
PNA		 3625 if (te->set->flags & NFT_SET_MAP &&
3626 !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END))
3627 nft_data_uninit(&te->elem.data, te->set->dtype);
3628 te->set->ops->remove(te->set, &te->elem);
60319eb1
PNA		 3629 nft_trans_destroy(trans);
3630 break;
37082f93 3631 }
37082f93
PNA		 3632 }
3633
b326dd37
PNA		 3634 synchronize_rcu();
3635
37082f93 3636 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 3637 list_del(&trans->list);
b326dd37 3638 nf_tables_commit_release(trans);
37082f93 3639 }
84d7fce6
PNA		 3640
3641 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 3642
3643 return 0;
3644}
3645
b326dd37 3646static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 3647{
c7c32e72
PNA		 3648 switch (trans->msg_type) {
3649 case NFT_MSG_NEWTABLE:
3650 nf_tables_table_destroy(&trans->ctx);
3651 break;
3652 case NFT_MSG_NEWCHAIN:
3653 nf_tables_chain_destroy(trans->ctx.chain);
3654 break;
3655 case NFT_MSG_NEWRULE:
3656 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3657 break;
3658 case NFT_MSG_NEWSET:
3659 nft_set_destroy(nft_trans_set(trans));
3660 break;
3661 }
3662 kfree(trans);
3663}
3664
37082f93
PNA		 3665static int nf_tables_abort(struct sk_buff *skb)
3666{
3667 struct net *net = sock_net(skb->sk);
3668 struct nft_trans *trans, *next;
02263db0 3669 struct nft_trans_elem *te;
37082f93
PNA		 3670
3671 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 3672 switch (trans->msg_type) {
55dd6f93
PNA		 3673 case NFT_MSG_NEWTABLE:
3674 if (nft_trans_table_update(trans)) {
3675 if (nft_trans_table_enable(trans)) {
3676 nf_tables_table_disable(trans->ctx.afi,
3677 trans->ctx.table);
3678 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3679 }
3680 nft_trans_destroy(trans);
3681 } else {
e688a7f8 3682 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 3683 }
3684 break;
3685 case NFT_MSG_DELTABLE:
e688a7f8
PNA		 3686 list_add_tail_rcu(&trans->ctx.table->list,
3687 &trans->ctx.afi->tables);
55dd6f93
PNA		 3688 nft_trans_destroy(trans);
3689 break;
91c7b38d
PNA		 3690 case NFT_MSG_NEWCHAIN:
3691 if (nft_trans_chain_update(trans)) {
982f4051 3692 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 3693
3694 nft_trans_destroy(trans);
3695 } else {
4fefee57 3696 trans->ctx.table->use--;
e688a7f8 3697 list_del_rcu(&trans->ctx.chain->list);
c5598794
AB		 3698 nf_tables_unregister_hooks(trans->ctx.table,
3699 trans->ctx.chain,
3700 trans->ctx.afi->nops);
91c7b38d
PNA		 3701 }
3702 break;
3703 case NFT_MSG_DELCHAIN:
4fefee57 3704 trans->ctx.table->use++;
e688a7f8
PNA		 3705 list_add_tail_rcu(&trans->ctx.chain->list,
3706 &trans->ctx.table->chains);
91c7b38d
PNA		 3707 nft_trans_destroy(trans);
3708 break;
b380e5c7 3709 case NFT_MSG_NEWRULE:
4fefee57 3710 trans->ctx.chain->use--;
b380e5c7
PNA		 3711 list_del_rcu(&nft_trans_rule(trans)->list);
3712 break;
3713 case NFT_MSG_DELRULE:
4fefee57 3714 trans->ctx.chain->use++;
b380e5c7 3715 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 3716 nft_trans_destroy(trans);
b380e5c7 3717 break;
958bee14 3718 case NFT_MSG_NEWSET:
4fefee57 3719 trans->ctx.table->use--;
e688a7f8 3720 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 3721 break;
3722 case NFT_MSG_DELSET:
4fefee57 3723 trans->ctx.table->use++;
e688a7f8
PNA		 3724 list_add_tail_rcu(&nft_trans_set(trans)->list,
3725 &trans->ctx.table->sets);
958bee14
PNA		 3726 nft_trans_destroy(trans);
3727 break;
60319eb1 3728 case NFT_MSG_NEWSETELEM:
4fefee57 3729 nft_trans_elem_set(trans)->nelems--;
02263db0
PNA		 3730 te = (struct nft_trans_elem *)trans->data;
3731 te->set->ops->get(te->set, &te->elem);
3732 nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
3733 if (te->set->flags & NFT_SET_MAP &&
3734 !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END))
3735 nft_data_uninit(&te->elem.data, te->set->dtype);
3736 te->set->ops->remove(te->set, &te->elem);
60319eb1
PNA		 3737 nft_trans_destroy(trans);
3738 break;
3739 case NFT_MSG_DELSETELEM:
4fefee57 3740 nft_trans_elem_set(trans)->nelems++;
60319eb1
PNA		 3741 nft_trans_destroy(trans);
3742 break;
37082f93 3743 }
37082f93
PNA		 3744 }
3745
b326dd37
PNA		 3746 synchronize_rcu();
3747
a1cee076
PNA		 3748 list_for_each_entry_safe_reverse(trans, next,
3749 &net->nft.commit_list, list) {
c7c32e72 3750 list_del(&trans->list);
b326dd37 3751 nf_tables_abort_release(trans);
37082f93
PNA		 3752 }
3753
3754 return 0;
3755}
3756
96518518
PM		 3757static const struct nfnetlink_subsystem nf_tables_subsys = {
3758 .name = "nf_tables",
3759 .subsys_id = NFNL_SUBSYS_NFTABLES,
3760 .cb_count = NFT_MSG_MAX,
3761 .cb = nf_tables_cb,
0628b123
PNA		 3762 .commit = nf_tables_commit,
3763 .abort = nf_tables_abort,
96518518
PM		 3764};
3765
7210e4e3
PNA		 3766int nft_chain_validate_dependency(const struct nft_chain *chain,
3767 enum nft_chain_type type)
3768{
3769 const struct nft_base_chain *basechain;
3770
3771 if (chain->flags & NFT_BASE_CHAIN) {
3772 basechain = nft_base_chain(chain);
3773 if (basechain->type->type != type)
3774 return -EOPNOTSUPP;
3775 }
3776 return 0;
3777}
3778EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
3779
75e8d06d
PNA		 3780int nft_chain_validate_hooks(const struct nft_chain *chain,
3781 unsigned int hook_flags)
3782{
3783 struct nft_base_chain *basechain;
3784
3785 if (chain->flags & NFT_BASE_CHAIN) {
3786 basechain = nft_base_chain(chain);
3787
3788 if ((1 << basechain->ops[0].hooknum) & hook_flags)
3789 return 0;
3790
3791 return -EOPNOTSUPP;
3792 }
3793
3794 return 0;
3795}
3796EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
3797
20a69341
PM		 3798/*
3799 * Loop detection - walk through the ruleset beginning at the destination chain
3800 * of a new jump until either the source chain is reached (loop) or all
3801 * reachable chains have been traversed.
3802 *
3803 * The loop check is performed whenever a new jump verdict is added to an
3804 * expression or verdict map or a verdict map is bound to a new chain.
3805 */
3806
3807static int nf_tables_check_loops(const struct nft_ctx *ctx,
3808 const struct nft_chain *chain);
3809
3810static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3811 const struct nft_set *set,
3812 const struct nft_set_iter *iter,
3813 const struct nft_set_elem *elem)
3814{
62f9c8b4
PNA		 3815 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3816 return 0;
3817
20a69341
PM		 3818 switch (elem->data.verdict) {
3819 case NFT_JUMP:
3820 case NFT_GOTO:
3821 return nf_tables_check_loops(ctx, elem->data.chain);
3822 default:
3823 return 0;
3824 }
3825}
3826
3827static int nf_tables_check_loops(const struct nft_ctx *ctx,
3828 const struct nft_chain *chain)
3829{
3830 const struct nft_rule *rule;
3831 const struct nft_expr *expr, *last;
20a69341
PM		 3832 const struct nft_set *set;
3833 struct nft_set_binding *binding;
3834 struct nft_set_iter iter;
20a69341
PM		 3835
3836 if (ctx->chain == chain)
3837 return -ELOOP;
3838
3839 list_for_each_entry(rule, &chain->rules, list) {
3840 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 3841 const struct nft_data *data = NULL;
3842 int err;
3843
3844 if (!expr->ops->validate)
20a69341
PM		 3845 continue;
3846
0ca743a5
PNA		 3847 err = expr->ops->validate(ctx, expr, &data);
3848 if (err < 0)
3849 return err;
3850
20a69341 3851 if (data == NULL)
0ca743a5 3852 continue;
20a69341
PM		 3853
3854 switch (data->verdict) {
3855 case NFT_JUMP:
3856 case NFT_GOTO:
3857 err = nf_tables_check_loops(ctx, data->chain);
3858 if (err < 0)
3859 return err;
3860 default:
3861 break;
3862 }
3863 }
3864 }
3865
3866 list_for_each_entry(set, &ctx->table->sets, list) {
3867 if (!(set->flags & NFT_SET_MAP) ||
3868 set->dtype != NFT_DATA_VERDICT)
3869 continue;
3870
3871 list_for_each_entry(binding, &set->bindings, list) {
3872 if (binding->chain != chain)
3873 continue;
3874
3875 iter.skip = 0;
3876 iter.count = 0;
3877 iter.err = 0;
3878 iter.fn = nf_tables_loop_check_setelem;
3879
3880 set->ops->walk(ctx, set, &iter);
3881 if (iter.err < 0)
3882 return iter.err;
3883 }
3884 }
3885
3886 return 0;
3887}
3888
96518518
PM		 3889/**
3890 * nft_validate_input_register - validate an expressions' input register
3891 *
3892 * @reg: the register number
3893 *
3894 * Validate that the input register is one of the general purpose
3895 * registers.
3896 */
3897int nft_validate_input_register(enum nft_registers reg)
3898{
3899 if (reg <= NFT_REG_VERDICT)
3900 return -EINVAL;
3901 if (reg > NFT_REG_MAX)
3902 return -ERANGE;
3903 return 0;
3904}
3905EXPORT_SYMBOL_GPL(nft_validate_input_register);
3906
3907/**
3908 * nft_validate_output_register - validate an expressions' output register
3909 *
3910 * @reg: the register number
3911 *
3912 * Validate that the output register is one of the general purpose
3913 * registers or the verdict register.
3914 */
3915int nft_validate_output_register(enum nft_registers reg)
3916{
3917 if (reg < NFT_REG_VERDICT)
3918 return -EINVAL;
3919 if (reg > NFT_REG_MAX)
3920 return -ERANGE;
3921 return 0;
3922}
3923EXPORT_SYMBOL_GPL(nft_validate_output_register);
3924
3925/**
3926 * nft_validate_data_load - validate an expressions' data load
3927 *
3928 * @ctx: context of the expression performing the load
3929 * @reg: the destination register number
3930 * @data: the data to load
3931 * @type: the data type
3932 *
3933 * Validate that a data load uses the appropriate data type for
3934 * the destination register. A value of NULL for the data means
3935 * that its runtime gathered data, which is always of type
3936 * NFT_DATA_VALUE.
3937 */
3938int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3939 const struct nft_data *data,
3940 enum nft_data_types type)
3941{
20a69341
PM		 3942 int err;
3943
96518518
PM		 3944 switch (reg) {
3945 case NFT_REG_VERDICT:
3946 if (data == NULL || type != NFT_DATA_VERDICT)
3947 return -EINVAL;
20a69341
PM		 3948
3949 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3950 err = nf_tables_check_loops(ctx, data->chain);
3951 if (err < 0)
3952 return err;
3953
3954 if (ctx->chain->level + 1 > data->chain->level) {
3955 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3956 return -EMLINK;
3957 data->chain->level = ctx->chain->level + 1;
3958 }
3959 }
3960
96518518
PM		 3961 return 0;
3962 default:
3963 if (data != NULL && type != NFT_DATA_VALUE)
3964 return -EINVAL;
3965 return 0;
3966 }
3967}
3968EXPORT_SYMBOL_GPL(nft_validate_data_load);
3969
3970static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3971 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3972 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3973 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3974};
3975
3976static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3977 struct nft_data_desc *desc, const struct nlattr *nla)
3978{
3979 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3980 struct nft_chain *chain;
3981 int err;
3982
3983 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3984 if (err < 0)
3985 return err;
3986
3987 if (!tb[NFTA_VERDICT_CODE])
3988 return -EINVAL;
3989 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3990
3991 switch (data->verdict) {
e0abdadc
PM		 3992 default:
3993 switch (data->verdict & NF_VERDICT_MASK) {
3994 case NF_ACCEPT:
3995 case NF_DROP:
3996 case NF_QUEUE:
3997 break;
3998 default:
3999 return -EINVAL;
4000 }
4001 /* fall through */
96518518
PM		 4002 case NFT_CONTINUE:
4003 case NFT_BREAK:
4004 case NFT_RETURN:
4005 desc->len = sizeof(data->verdict);
4006 break;
4007 case NFT_JUMP:
4008 case NFT_GOTO:
4009 if (!tb[NFTA_VERDICT_CHAIN])
4010 return -EINVAL;
4011 chain = nf_tables_chain_lookup(ctx->table,
4012 tb[NFTA_VERDICT_CHAIN]);
4013 if (IS_ERR(chain))
4014 return PTR_ERR(chain);
4015 if (chain->flags & NFT_BASE_CHAIN)
4016 return -EOPNOTSUPP;
4017
96518518
PM		 4018 chain->use++;
4019 data->chain = chain;
4020 desc->len = sizeof(data);
4021 break;
96518518
PM		 4022 }
4023
4024 desc->type = NFT_DATA_VERDICT;
4025 return 0;
4026}
4027
4028static void nft_verdict_uninit(const struct nft_data *data)
4029{
4030 switch (data->verdict) {
4031 case NFT_JUMP:
4032 case NFT_GOTO:
4033 data->chain->use--;
4034 break;
4035 }
4036}
4037
4038static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
4039{
4040 struct nlattr *nest;
4041
4042 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
4043 if (!nest)
4044 goto nla_put_failure;
4045
4046 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
4047 goto nla_put_failure;
4048
4049 switch (data->verdict) {
4050 case NFT_JUMP:
4051 case NFT_GOTO:
4052 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
4053 goto nla_put_failure;
4054 }
4055 nla_nest_end(skb, nest);
4056 return 0;
4057
4058nla_put_failure:
4059 return -1;
4060}
4061
4062static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
4063 struct nft_data_desc *desc, const struct nlattr *nla)
4064{
4065 unsigned int len;
4066
4067 len = nla_len(nla);
4068 if (len == 0)
4069 return -EINVAL;
4070 if (len > sizeof(data->data))
4071 return -EOVERFLOW;
4072
4073 nla_memcpy(data->data, nla, sizeof(data->data));
4074 desc->type = NFT_DATA_VALUE;
4075 desc->len = len;
4076 return 0;
4077}
4078
4079static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
4080 unsigned int len)
4081{
4082 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
4083}
4084
4085static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
4086 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
4087 .len = FIELD_SIZEOF(struct nft_data, data) },
4088 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
4089};
4090
4091/**
4092 * nft_data_init - parse nf_tables data netlink attributes
4093 *
4094 * @ctx: context of the expression using the data
4095 * @data: destination struct nft_data
4096 * @desc: data description
4097 * @nla: netlink attribute containing data
4098 *
4099 * Parse the netlink data attributes and initialize a struct nft_data.
4100 * The type and length of data are returned in the data description.
4101 *
4102 * The caller can indicate that it only wants to accept data of type
4103 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4104 */
4105int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
4106 struct nft_data_desc *desc, const struct nlattr *nla)
4107{
4108 struct nlattr *tb[NFTA_DATA_MAX + 1];
4109 int err;
4110
4111 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
4112 if (err < 0)
4113 return err;
4114
4115 if (tb[NFTA_DATA_VALUE])
4116 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
4117 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
4118 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
4119 return -EINVAL;
4120}
4121EXPORT_SYMBOL_GPL(nft_data_init);
4122
4123/**
4124 * nft_data_uninit - release a nft_data item
4125 *
4126 * @data: struct nft_data to release
4127 * @type: type of data
4128 *
4129 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4130 * all others need to be released by calling this function.
4131 */
4132void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
4133{
4134 switch (type) {
4135 case NFT_DATA_VALUE:
4136 return;
4137 case NFT_DATA_VERDICT:
4138 return nft_verdict_uninit(data);
4139 default:
4140 WARN_ON(1);
4141 }
4142}
4143EXPORT_SYMBOL_GPL(nft_data_uninit);
4144
4145int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
4146 enum nft_data_types type, unsigned int len)
4147{
4148 struct nlattr *nest;
4149 int err;
4150
4151 nest = nla_nest_start(skb, attr);
4152 if (nest == NULL)
4153 return -1;
4154
4155 switch (type) {
4156 case NFT_DATA_VALUE:
4157 err = nft_value_dump(skb, data, len);
4158 break;
4159 case NFT_DATA_VERDICT:
4160 err = nft_verdict_dump(skb, data);
4161 break;
4162 default:
4163 err = -EINVAL;
4164 WARN_ON(1);
4165 }
4166
4167 nla_nest_end(skb, nest);
4168 return err;
4169}
4170EXPORT_SYMBOL_GPL(nft_data_dump);
4171
99633ab2
PNA		 4172static int nf_tables_init_net(struct net *net)
4173{
4174 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 4175 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 4176 net->nft.base_seq = 1;
99633ab2
PNA		 4177 return 0;
4178}
4179
4180static struct pernet_operations nf_tables_net_ops = {
4181 .init = nf_tables_init_net,
4182};
4183
96518518
PM		 4184static int __init nf_tables_module_init(void)
4185{
4186 int err;
4187
4188 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4189 GFP_KERNEL);
4190 if (info == NULL) {
4191 err = -ENOMEM;
4192 goto err1;
4193 }
4194
4195 err = nf_tables_core_module_init();
4196 if (err < 0)
4197 goto err2;
4198
4199 err = nfnetlink_subsys_register(&nf_tables_subsys);
4200 if (err < 0)
4201 goto err3;
4202
4203 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 4204 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 4205err3:
4206 nf_tables_core_module_exit();
4207err2:
4208 kfree(info);
4209err1:
4210 return err;
4211}
4212
4213static void __exit nf_tables_module_exit(void)
4214{
99633ab2 4215 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 4216 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 4217 rcu_barrier();
96518518
PM		 4218 nf_tables_core_module_exit();
4219 kfree(info);
4220}
4221
4222module_init(nf_tables_module_init);
4223module_exit(nf_tables_module_exit);
4224
4225MODULE_LICENSE("GPL");
4226MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4227MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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