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netfilter: conntrack: remove prealloc support
[mirror_ubuntu-artful-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 24static LIST_HEAD(nf_tables_expressions);
e5009240 25static LIST_HEAD(nf_tables_objects);
96518518
PM		 26
27/**
28 * nft_register_afinfo - register nf_tables address family info
29 *
30 * @afi: address family info to register
31 *
32 * Register the address family for use with nf_tables. Returns zero on
33 * success or a negative errno code otherwise.
34 */
99633ab2 35int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 36{
37 INIT_LIST_HEAD(&afi->tables);
38 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 39 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 40 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
41 return 0;
42}
43EXPORT_SYMBOL_GPL(nft_register_afinfo);
44
df05ef87
PNA		 45static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
46
96518518
PM		 47/**
48 * nft_unregister_afinfo - unregister nf_tables address family info
49 *
50 * @afi: address family info to unregister
51 *
52 * Unregister the address family for use with nf_tables.
53 */
df05ef87 54void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 55{
56 nfnl_lock(NFNL_SUBSYS_NFTABLES);
df05ef87 57 __nft_release_afinfo(net, afi);
e688a7f8 58 list_del_rcu(&afi->list);
96518518
PM		 59 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
60}
61EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
62
99633ab2 63static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 64{
65 struct nft_af_info *afi;
66
99633ab2 67 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 68 if (afi->family == family)
69 return afi;
70 }
71 return NULL;
72}
73
99633ab2
PNA		 74static struct nft_af_info *
75nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 76{
77 struct nft_af_info *afi;
78
99633ab2 79 afi = nft_afinfo_lookup(net, family);
96518518
PM		 80 if (afi != NULL)
81 return afi;
82#ifdef CONFIG_MODULES
83 if (autoload) {
84 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
85 request_module("nft-afinfo-%u", family);
86 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 87 afi = nft_afinfo_lookup(net, family);
96518518
PM		 88 if (afi != NULL)
89 return ERR_PTR(-EAGAIN);
90 }
91#endif
92 return ERR_PTR(-EAFNOSUPPORT);
93}
94
7c95f6d8 95static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 96 struct net *net,
7c95f6d8
PNA		 97 const struct sk_buff *skb,
98 const struct nlmsghdr *nlh,
99 struct nft_af_info *afi,
100 struct nft_table *table,
101 struct nft_chain *chain,
102 const struct nlattr * const *nla)
103{
633c9a84 104 ctx->net = net;
128ad332
PNA		 105 ctx->afi = afi;
106 ctx->table = table;
107 ctx->chain = chain;
108 ctx->nla = nla;
109 ctx->portid = NETLINK_CB(skb).portid;
110 ctx->report = nlmsg_report(nlh);
111 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 112}
113
8411b644
PNA		 114static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
115 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 116{
117 struct nft_trans *trans;
118
8411b644 119 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 120 if (trans == NULL)
121 return NULL;
122
b380e5c7 123 trans->msg_type = msg_type;
1081d11b
PNA		 124 trans->ctx = *ctx;
125
126 return trans;
127}
128
8411b644
PNA		 129static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
130 int msg_type, u32 size)
131{
132 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
133}
134
1081d11b
PNA		 135static void nft_trans_destroy(struct nft_trans *trans)
136{
137 list_del(&trans->list);
138 kfree(trans);
139}
140
82bec71d
PNA		 141static int nf_tables_register_hooks(struct net *net,
142 const struct nft_table *table,
d8ee8f7c
PNA		 143 struct nft_chain *chain,
144 unsigned int hook_nops)
145{
146 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 147 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 148 return 0;
149
82bec71d
PNA		 150 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
151 hook_nops);
d8ee8f7c
PNA		 152}
153
82bec71d
PNA		 154static void nf_tables_unregister_hooks(struct net *net,
155 const struct nft_table *table,
d8ee8f7c 156 struct nft_chain *chain,
c5598794
AB		 157 unsigned int hook_nops)
158{
d8ee8f7c 159 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 160 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 161 return;
162
82bec71d 163 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
c5598794
AB		 164}
165
ee01d542
AB		 166static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
167{
168 struct nft_trans *trans;
169
170 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
171 if (trans == NULL)
172 return -ENOMEM;
173
174 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 175 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 176
177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
178 return 0;
179}
180
181static int nft_deltable(struct nft_ctx *ctx)
182{
183 int err;
184
185 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
186 if (err < 0)
187 return err;
188
f2a6d766 189 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 190 return err;
191}
192
193static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
194{
195 struct nft_trans *trans;
196
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
198 if (trans == NULL)
199 return -ENOMEM;
200
201 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 202 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 203
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
205 return 0;
206}
207
208static int nft_delchain(struct nft_ctx *ctx)
209{
210 int err;
211
212 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
213 if (err < 0)
214 return err;
215
216 ctx->table->use--;
664b0f8c 217 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542
AB		 218
219 return err;
220}
221
ee01d542
AB		 222static int
223nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
224{
225 /* You cannot delete the same rule twice */
889f7ee7
PNA		 226 if (nft_is_active_next(ctx->net, rule)) {
227 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 228 ctx->chain->use--;
229 return 0;
230 }
231 return -ENOENT;
232}
233
234static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
235 struct nft_rule *rule)
236{
237 struct nft_trans *trans;
238
239 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
240 if (trans == NULL)
241 return NULL;
242
1a94e38d
PNA		 243 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
244 nft_trans_rule_id(trans) =
245 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
246 }
ee01d542
AB		 247 nft_trans_rule(trans) = rule;
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
249
250 return trans;
251}
252
253static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
254{
255 struct nft_trans *trans;
256 int err;
257
258 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
259 if (trans == NULL)
260 return -ENOMEM;
261
262 err = nf_tables_delrule_deactivate(ctx, rule);
263 if (err < 0) {
264 nft_trans_destroy(trans);
265 return err;
266 }
267
268 return 0;
269}
270
271static int nft_delrule_by_chain(struct nft_ctx *ctx)
272{
273 struct nft_rule *rule;
274 int err;
275
276 list_for_each_entry(rule, &ctx->chain->rules, list) {
277 err = nft_delrule(ctx, rule);
278 if (err < 0)
279 return err;
280 }
281 return 0;
282}
283
ee01d542
AB		 284static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
285 struct nft_set *set)
286{
287 struct nft_trans *trans;
288
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
290 if (trans == NULL)
291 return -ENOMEM;
292
293 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
294 nft_trans_set_id(trans) =
295 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 296 nft_activate_next(ctx->net, set);
ee01d542
AB		 297 }
298 nft_trans_set(trans) = set;
299 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
300
301 return 0;
302}
303
304static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
305{
306 int err;
307
308 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
309 if (err < 0)
310 return err;
311
37a9cc52 312 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 313 ctx->table->use--;
314
315 return err;
316}
317
e5009240
PNA		 318static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
319 struct nft_object *obj)
320{
321 struct nft_trans *trans;
322
323 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
324 if (trans == NULL)
325 return -ENOMEM;
326
327 if (msg_type == NFT_MSG_NEWOBJ)
328 nft_activate_next(ctx->net, obj);
329
330 nft_trans_obj(trans) = obj;
331 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
332
333 return 0;
334}
335
336static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
337{
338 int err;
339
340 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
341 if (err < 0)
342 return err;
343
344 nft_deactivate_next(ctx->net, obj);
345 ctx->table->use--;
346
347 return err;
348}
349
96518518
PM		 350/*
351 * Tables
352 */
353
354static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 355 const struct nlattr *nla,
356 u8 genmask)
96518518
PM		 357{
358 struct nft_table *table;
359
360 list_for_each_entry(table, &afi->tables, list) {
f2a6d766
PNA		 361 if (!nla_strcmp(nla, table->name) &&
362 nft_active_genmask(table, genmask))
96518518
PM		 363 return table;
364 }
365 return NULL;
366}
367
368static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 369 const struct nlattr *nla,
370 u8 genmask)
96518518
PM		 371{
372 struct nft_table *table;
373
374 if (nla == NULL)
375 return ERR_PTR(-EINVAL);
376
f2a6d766 377 table = nft_table_lookup(afi, nla, genmask);
96518518
PM		 378 if (table != NULL)
379 return table;
380
96518518
PM		 381 return ERR_PTR(-ENOENT);
382}
383
384static inline u64 nf_tables_alloc_handle(struct nft_table *table)
385{
386 return ++table->hgenerator;
387}
388
2a37d755 389static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
9370761c 390
2a37d755 391static const struct nf_chain_type *
baae3e62 392__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 393{
394 int i;
395
baae3e62 396 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 397 if (chain_type[family][i] != NULL &&
398 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 399 return chain_type[family][i];
9370761c 400 }
baae3e62 401 return NULL;
9370761c
PNA		 402}
403
2a37d755 404static const struct nf_chain_type *
baae3e62
PM		 405nf_tables_chain_type_lookup(const struct nft_af_info *afi,
406 const struct nlattr *nla,
407 bool autoload)
9370761c 408{
2a37d755 409 const struct nf_chain_type *type;
9370761c
PNA		 410
411 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 412 if (type != NULL)
413 return type;
9370761c 414#ifdef CONFIG_MODULES
93b0806f 415 if (autoload) {
9370761c 416 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 417 request_module("nft-chain-%u-%.*s", afi->family,
418 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
420 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 421 if (type != NULL)
422 return ERR_PTR(-EAGAIN);
9370761c
PNA		 423 }
424#endif
93b0806f 425 return ERR_PTR(-ENOENT);
9370761c
PNA		 426}
427
96518518 428static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 429 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
430 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 431 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 432};
433
84d7fce6
PNA		 434static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
435 u32 portid, u32 seq, int event, u32 flags,
436 int family, const struct nft_table *table)
96518518
PM		 437{
438 struct nlmsghdr *nlh;
439 struct nfgenmsg *nfmsg;
440
dedb67c4 441 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 442 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
443 if (nlh == NULL)
444 goto nla_put_failure;
445
446 nfmsg = nlmsg_data(nlh);
447 nfmsg->nfgen_family = family;
448 nfmsg->version = NFNETLINK_V0;
84d7fce6 449 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 450
9ddf6323 451 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 452 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
453 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 454 goto nla_put_failure;
455
053c095a
JB		 456 nlmsg_end(skb, nlh);
457 return 0;
96518518
PM		 458
459nla_put_failure:
460 nlmsg_trim(skb, nlh);
461 return -1;
462}
463
25e94a99 464static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 465{
466 struct sk_buff *skb;
96518518
PM		 467 int err;
468
128ad332
PNA		 469 if (!ctx->report &&
470 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 471 return;
96518518 472
96518518
PM		 473 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
474 if (skb == NULL)
475 goto err;
476
84d7fce6
PNA		 477 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
478 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 479 if (err < 0) {
480 kfree_skb(skb);
481 goto err;
482 }
483
25e94a99
PNA		 484 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
485 ctx->report, GFP_KERNEL);
486 return;
96518518 487err:
25e94a99 488 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 489}
490
491static int nf_tables_dump_tables(struct sk_buff *skb,
492 struct netlink_callback *cb)
493{
494 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
495 const struct nft_af_info *afi;
496 const struct nft_table *table;
497 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 498 struct net *net = sock_net(skb->sk);
96518518
PM		 499 int family = nfmsg->nfgen_family;
500
e688a7f8 501 rcu_read_lock();
38e029f1
PNA		 502 cb->seq = net->nft.base_seq;
503
e688a7f8 504 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 505 if (family != NFPROTO_UNSPEC && family != afi->family)
506 continue;
507
e688a7f8 508 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 509 if (idx < s_idx)
510 goto cont;
511 if (idx > s_idx)
512 memset(&cb->args[1], 0,
513 sizeof(cb->args) - sizeof(cb->args[0]));
f2a6d766
PNA		 514 if (!nft_is_active(net, table))
515 continue;
84d7fce6 516 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 517 NETLINK_CB(cb->skb).portid,
518 cb->nlh->nlmsg_seq,
519 NFT_MSG_NEWTABLE,
520 NLM_F_MULTI,
521 afi->family, table) < 0)
522 goto done;
38e029f1
PNA		 523
524 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 525cont:
526 idx++;
527 }
528 }
529done:
e688a7f8 530 rcu_read_unlock();
96518518
PM		 531 cb->args[0] = idx;
532 return skb->len;
533}
534
7b8002a1
PNA		 535static int nf_tables_gettable(struct net *net, struct sock *nlsk,
536 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 537 const struct nlattr * const nla[])
538{
539 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 540 u8 genmask = nft_genmask_cur(net);
96518518
PM		 541 const struct nft_af_info *afi;
542 const struct nft_table *table;
543 struct sk_buff *skb2;
544 int family = nfmsg->nfgen_family;
545 int err;
546
547 if (nlh->nlmsg_flags & NLM_F_DUMP) {
548 struct netlink_dump_control c = {
549 .dump = nf_tables_dump_tables,
550 };
551 return netlink_dump_start(nlsk, skb, nlh, &c);
552 }
553
99633ab2 554 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 555 if (IS_ERR(afi))
556 return PTR_ERR(afi);
557
f2a6d766 558 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 559 if (IS_ERR(table))
560 return PTR_ERR(table);
561
562 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
563 if (!skb2)
564 return -ENOMEM;
565
84d7fce6 566 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 567 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
568 family, table);
569 if (err < 0)
570 goto err;
571
572 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
573
574err:
575 kfree_skb(skb2);
576 return err;
577}
578
10435c11
F		 579static void _nf_tables_table_disable(struct net *net,
580 const struct nft_af_info *afi,
581 struct nft_table *table,
582 u32 cnt)
583{
584 struct nft_chain *chain;
585 u32 i = 0;
586
587 list_for_each_entry(chain, &table->chains, list) {
588 if (!nft_is_active_next(net, chain))
589 continue;
f323d954 590 if (!nft_is_base_chain(chain))
10435c11
F		 591 continue;
592
593 if (cnt && i++ == cnt)
594 break;
595
596 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
597 afi->nops);
598 }
599}
600
664b0f8c
PNA		 601static int nf_tables_table_enable(struct net *net,
602 const struct nft_af_info *afi,
115a60b1 603 struct nft_table *table)
9ddf6323
PNA		 604{
605 struct nft_chain *chain;
606 int err, i = 0;
607
608 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 609 if (!nft_is_active_next(net, chain))
610 continue;
f323d954 611 if (!nft_is_base_chain(chain))
d2012975
PNA		 612 continue;
613
82bec71d
PNA		 614 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
615 afi->nops);
9ddf6323
PNA		 616 if (err < 0)
617 goto err;
618
619 i++;
620 }
621 return 0;
622err:
10435c11
F		 623 if (i)
624 _nf_tables_table_disable(net, afi, table, i);
9ddf6323
PNA		 625 return err;
626}
627
664b0f8c
PNA		 628static void nf_tables_table_disable(struct net *net,
629 const struct nft_af_info *afi,
d8ee8f7c 630 struct nft_table *table)
9ddf6323 631{
10435c11 632 _nf_tables_table_disable(net, afi, table, 0);
9ddf6323
PNA		 633}
634
e1aaca93 635static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 636{
55dd6f93 637 struct nft_trans *trans;
e1aaca93 638 u32 flags;
55dd6f93 639 int ret = 0;
9ddf6323 640
e1aaca93
PNA		 641 if (!ctx->nla[NFTA_TABLE_FLAGS])
642 return 0;
9ddf6323 643
e1aaca93
PNA		 644 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
645 if (flags & ~NFT_TABLE_F_DORMANT)
646 return -EINVAL;
647
63283dd2
PNA		 648 if (flags == ctx->table->flags)
649 return 0;
650
55dd6f93
PNA		 651 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
652 sizeof(struct nft_trans_table));
653 if (trans == NULL)
654 return -ENOMEM;
9ddf6323 655
e1aaca93
PNA		 656 if ((flags & NFT_TABLE_F_DORMANT) &&
657 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 658 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 659 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
660 ctx->table->flags & NFT_TABLE_F_DORMANT) {
664b0f8c 661 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
55dd6f93 662 if (ret >= 0) {
e1aaca93 663 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 664 nft_trans_table_enable(trans) = true;
9ddf6323 665 }
9ddf6323 666 }
e1aaca93
PNA		 667 if (ret < 0)
668 goto err;
9ddf6323 669
55dd6f93
PNA		 670 nft_trans_table_update(trans) = true;
671 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
672 return 0;
9ddf6323 673err:
55dd6f93 674 nft_trans_destroy(trans);
9ddf6323
PNA		 675 return ret;
676}
677
633c9a84
PNA		 678static int nf_tables_newtable(struct net *net, struct sock *nlsk,
679 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 680 const struct nlattr * const nla[])
681{
682 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 683 u8 genmask = nft_genmask_next(net);
96518518
PM		 684 const struct nlattr *name;
685 struct nft_af_info *afi;
686 struct nft_table *table;
687 int family = nfmsg->nfgen_family;
c5c1f975 688 u32 flags = 0;
e1aaca93 689 struct nft_ctx ctx;
55dd6f93 690 int err;
96518518 691
99633ab2 692 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 693 if (IS_ERR(afi))
694 return PTR_ERR(afi);
695
696 name = nla[NFTA_TABLE_NAME];
f2a6d766 697 table = nf_tables_table_lookup(afi, name, genmask);
96518518
PM		 698 if (IS_ERR(table)) {
699 if (PTR_ERR(table) != -ENOENT)
700 return PTR_ERR(table);
1a28ad74 701 } else {
96518518
PM		 702 if (nlh->nlmsg_flags & NLM_F_EXCL)
703 return -EEXIST;
704 if (nlh->nlmsg_flags & NLM_F_REPLACE)
705 return -EOPNOTSUPP;
e1aaca93 706
633c9a84 707 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 708 return nf_tables_updtable(&ctx);
96518518
PM		 709 }
710
c5c1f975
PM		 711 if (nla[NFTA_TABLE_FLAGS]) {
712 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
713 if (flags & ~NFT_TABLE_F_DORMANT)
714 return -EINVAL;
715 }
716
ebddf1a8 717 err = -EAFNOSUPPORT;
7047f9d0 718 if (!try_module_get(afi->owner))
ebddf1a8 719 goto err1;
7047f9d0 720
ffdb210e 721 err = -ENOMEM;
1cae565e 722 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 723 if (table == NULL)
ebddf1a8 724 goto err2;
96518518 725
1cae565e 726 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 727 INIT_LIST_HEAD(&table->chains);
20a69341 728 INIT_LIST_HEAD(&table->sets);
e5009240 729 INIT_LIST_HEAD(&table->objects);
c5c1f975 730 table->flags = flags;
9ddf6323 731
633c9a84 732 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 733 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 734 if (err < 0)
ebddf1a8 735 goto err3;
ffdb210e 736
e688a7f8 737 list_add_tail_rcu(&table->list, &afi->tables);
96518518 738 return 0;
ebddf1a8 739err3:
ffdb210e 740 kfree(table);
ebddf1a8 741err2:
ffdb210e 742 module_put(afi->owner);
ebddf1a8 743err1:
ffdb210e 744 return err;
96518518
PM		 745}
746
b9ac12ef
AB		 747static int nft_flush_table(struct nft_ctx *ctx)
748{
749 int err;
750 struct nft_chain *chain, *nc;
e5009240 751 struct nft_object *obj, *ne;
b9ac12ef
AB		 752 struct nft_set *set, *ns;
753
a2f18db0 754 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 755 if (!nft_is_active_next(ctx->net, chain))
756 continue;
757
b9ac12ef
AB		 758 ctx->chain = chain;
759
760 err = nft_delrule_by_chain(ctx);
761 if (err < 0)
762 goto out;
b9ac12ef
AB		 763 }
764
765 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 766 if (!nft_is_active_next(ctx->net, set))
767 continue;
768
b9ac12ef
AB		 769 if (set->flags & NFT_SET_ANONYMOUS &&
770 !list_empty(&set->bindings))
771 continue;
772
773 err = nft_delset(ctx, set);
774 if (err < 0)
775 goto out;
776 }
777
e5009240
PNA		 778 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
779 err = nft_delobj(ctx, obj);
780 if (err < 0)
781 goto out;
782 }
783
a2f18db0 784 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 785 if (!nft_is_active_next(ctx->net, chain))
786 continue;
787
a2f18db0
PNA		 788 ctx->chain = chain;
789
790 err = nft_delchain(ctx);
791 if (err < 0)
792 goto out;
793 }
794
b9ac12ef
AB		 795 err = nft_deltable(ctx);
796out:
797 return err;
798}
799
800static int nft_flush(struct nft_ctx *ctx, int family)
801{
802 struct nft_af_info *afi;
803 struct nft_table *table, *nt;
804 const struct nlattr * const *nla = ctx->nla;
805 int err = 0;
806
807 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
808 if (family != AF_UNSPEC && afi->family != family)
809 continue;
810
811 ctx->afi = afi;
812 list_for_each_entry_safe(table, nt, &afi->tables, list) {
f2a6d766
PNA		 813 if (!nft_is_active_next(ctx->net, table))
814 continue;
815
b9ac12ef
AB		 816 if (nla[NFTA_TABLE_NAME] &&
817 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
818 continue;
819
820 ctx->table = table;
821
822 err = nft_flush_table(ctx);
823 if (err < 0)
824 goto out;
825 }
826 }
827out:
828 return err;
829}
830
633c9a84
PNA		 831static int nf_tables_deltable(struct net *net, struct sock *nlsk,
832 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 833 const struct nlattr * const nla[])
834{
835 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 836 u8 genmask = nft_genmask_next(net);
96518518
PM		 837 struct nft_af_info *afi;
838 struct nft_table *table;
ee01d542 839 int family = nfmsg->nfgen_family;
55dd6f93 840 struct nft_ctx ctx;
96518518 841
633c9a84 842 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 843 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
844 return nft_flush(&ctx, family);
845
99633ab2 846 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 847 if (IS_ERR(afi))
848 return PTR_ERR(afi);
849
f2a6d766 850 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 851 if (IS_ERR(table))
852 return PTR_ERR(table);
96518518 853
b9ac12ef
AB		 854 ctx.afi = afi;
855 ctx.table = table;
55dd6f93 856
b9ac12ef 857 return nft_flush_table(&ctx);
96518518
PM		 858}
859
55dd6f93
PNA		 860static void nf_tables_table_destroy(struct nft_ctx *ctx)
861{
4fefee57
PNA		 862 BUG_ON(ctx->table->use > 0);
863
55dd6f93
PNA		 864 kfree(ctx->table);
865 module_put(ctx->afi->owner);
866}
867
2a37d755 868int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 869{
9370761c 870 int err = 0;
96518518
PM		 871
872 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 873 if (chain_type[ctype->family][ctype->type] != NULL) {
874 err = -EBUSY;
875 goto out;
96518518 876 }
9370761c
PNA		 877 chain_type[ctype->family][ctype->type] = ctype;
878out:
96518518
PM		 879 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
880 return err;
881}
9370761c 882EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 883
2a37d755 884void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 885{
96518518 886 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 887 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 888 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
889}
9370761c 890EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 891
892/*
893 * Chains
894 */
895
896static struct nft_chain *
664b0f8c
PNA		 897nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
898 u8 genmask)
96518518
PM		 899{
900 struct nft_chain *chain;
901
902 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 903 if (chain->handle == handle &&
904 nft_active_genmask(chain, genmask))
96518518
PM		 905 return chain;
906 }
907
908 return ERR_PTR(-ENOENT);
909}
910
911static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
664b0f8c
PNA		 912 const struct nlattr *nla,
913 u8 genmask)
96518518
PM		 914{
915 struct nft_chain *chain;
916
917 if (nla == NULL)
918 return ERR_PTR(-EINVAL);
919
920 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 921 if (!nla_strcmp(nla, chain->name) &&
922 nft_active_genmask(chain, genmask))
96518518
PM		 923 return chain;
924 }
925
926 return ERR_PTR(-ENOENT);
927}
928
929static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 930 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
931 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 932 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
933 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
934 .len = NFT_CHAIN_MAXNAMELEN - 1 },
935 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 936 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 937 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 938 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 939};
940
941static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
942 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
943 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 944 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
945 .len = IFNAMSIZ - 1 },
96518518
PM		 946};
947
0ca743a5
PNA		 948static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
949{
950 struct nft_stats *cpu_stats, total;
951 struct nlattr *nest;
ce355e20
ED		 952 unsigned int seq;
953 u64 pkts, bytes;
0ca743a5
PNA		 954 int cpu;
955
956 memset(&total, 0, sizeof(total));
957 for_each_possible_cpu(cpu) {
958 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 959 do {
960 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
961 pkts = cpu_stats->pkts;
962 bytes = cpu_stats->bytes;
963 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
964 total.pkts += pkts;
965 total.bytes += bytes;
0ca743a5
PNA		 966 }
967 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
968 if (nest == NULL)
969 goto nla_put_failure;
970
b46f6ded
ND		 971 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
972 NFTA_COUNTER_PAD) ||
973 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
974 NFTA_COUNTER_PAD))
0ca743a5
PNA		 975 goto nla_put_failure;
976
977 nla_nest_end(skb, nest);
978 return 0;
979
980nla_put_failure:
981 return -ENOSPC;
982}
983
84d7fce6
PNA		 984static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
985 u32 portid, u32 seq, int event, u32 flags,
986 int family, const struct nft_table *table,
96518518
PM		 987 const struct nft_chain *chain)
988{
989 struct nlmsghdr *nlh;
990 struct nfgenmsg *nfmsg;
991
dedb67c4 992 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 993 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
994 if (nlh == NULL)
995 goto nla_put_failure;
996
997 nfmsg = nlmsg_data(nlh);
998 nfmsg->nfgen_family = family;
999 nfmsg->version = NFNETLINK_V0;
84d7fce6 1000 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1001
1002 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1003 goto nla_put_failure;
b46f6ded
ND		 1004 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1005 NFTA_CHAIN_PAD))
96518518
PM		 1006 goto nla_put_failure;
1007 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1008 goto nla_put_failure;
1009
f323d954 1010 if (nft_is_base_chain(chain)) {
0ca743a5 1011 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 1012 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 1013 struct nlattr *nest;
1014
1015 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 1016 if (nest == NULL)
1017 goto nla_put_failure;
1018 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1019 goto nla_put_failure;
1020 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1021 goto nla_put_failure;
2cbce139
PNA		 1022 if (basechain->dev_name[0] &&
1023 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1024 goto nla_put_failure;
96518518 1025 nla_nest_end(skb, nest);
9370761c 1026
0ca743a5
PNA		 1027 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1028 htonl(basechain->policy)))
1029 goto nla_put_failure;
1030
baae3e62
PM		 1031 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1032 goto nla_put_failure;
0ca743a5
PNA		 1033
1034 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1035 goto nla_put_failure;
96518518
PM		 1036 }
1037
0ca743a5
PNA		 1038 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1039 goto nla_put_failure;
1040
053c095a
JB		 1041 nlmsg_end(skb, nlh);
1042 return 0;
96518518
PM		 1043
1044nla_put_failure:
1045 nlmsg_trim(skb, nlh);
1046 return -1;
1047}
1048
25e94a99 1049static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1050{
1051 struct sk_buff *skb;
96518518
PM		 1052 int err;
1053
128ad332
PNA		 1054 if (!ctx->report &&
1055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1056 return;
96518518 1057
96518518
PM		 1058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1059 if (skb == NULL)
1060 goto err;
1061
84d7fce6
PNA		 1062 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1063 event, 0, ctx->afi->family, ctx->table,
35151d84 1064 ctx->chain);
96518518
PM		 1065 if (err < 0) {
1066 kfree_skb(skb);
1067 goto err;
1068 }
1069
25e94a99
PNA		 1070 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1071 ctx->report, GFP_KERNEL);
1072 return;
96518518 1073err:
25e94a99 1074 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1075}
1076
1077static int nf_tables_dump_chains(struct sk_buff *skb,
1078 struct netlink_callback *cb)
1079{
1080 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1081 const struct nft_af_info *afi;
1082 const struct nft_table *table;
1083 const struct nft_chain *chain;
1084 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1085 struct net *net = sock_net(skb->sk);
96518518
PM		 1086 int family = nfmsg->nfgen_family;
1087
e688a7f8 1088 rcu_read_lock();
38e029f1
PNA		 1089 cb->seq = net->nft.base_seq;
1090
e688a7f8 1091 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1092 if (family != NFPROTO_UNSPEC && family != afi->family)
1093 continue;
1094
e688a7f8
PNA		 1095 list_for_each_entry_rcu(table, &afi->tables, list) {
1096 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1097 if (idx < s_idx)
1098 goto cont;
1099 if (idx > s_idx)
1100 memset(&cb->args[1], 0,
1101 sizeof(cb->args) - sizeof(cb->args[0]));
664b0f8c
PNA		 1102 if (!nft_is_active(net, chain))
1103 continue;
84d7fce6
PNA		 1104 if (nf_tables_fill_chain_info(skb, net,
1105 NETLINK_CB(cb->skb).portid,
96518518
PM		 1106 cb->nlh->nlmsg_seq,
1107 NFT_MSG_NEWCHAIN,
1108 NLM_F_MULTI,
1109 afi->family, table, chain) < 0)
1110 goto done;
38e029f1
PNA		 1111
1112 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1113cont:
1114 idx++;
1115 }
1116 }
1117 }
1118done:
e688a7f8 1119 rcu_read_unlock();
96518518
PM		 1120 cb->args[0] = idx;
1121 return skb->len;
1122}
1123
7b8002a1
PNA		 1124static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1125 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1126 const struct nlattr * const nla[])
1127{
1128 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1129 u8 genmask = nft_genmask_cur(net);
96518518
PM		 1130 const struct nft_af_info *afi;
1131 const struct nft_table *table;
1132 const struct nft_chain *chain;
1133 struct sk_buff *skb2;
1134 int family = nfmsg->nfgen_family;
1135 int err;
1136
1137 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1138 struct netlink_dump_control c = {
1139 .dump = nf_tables_dump_chains,
1140 };
1141 return netlink_dump_start(nlsk, skb, nlh, &c);
1142 }
1143
99633ab2 1144 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1145 if (IS_ERR(afi))
1146 return PTR_ERR(afi);
1147
f2a6d766 1148 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1149 if (IS_ERR(table))
1150 return PTR_ERR(table);
1151
664b0f8c 1152 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1153 if (IS_ERR(chain))
1154 return PTR_ERR(chain);
1155
1156 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1157 if (!skb2)
1158 return -ENOMEM;
1159
84d7fce6 1160 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1161 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1162 family, table, chain);
1163 if (err < 0)
1164 goto err;
1165
1166 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1167
1168err:
1169 kfree_skb(skb2);
1170 return err;
1171}
1172
0ca743a5
PNA		 1173static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1174 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1175 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1176};
1177
ff3cd7b3 1178static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1179{
1180 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1181 struct nft_stats __percpu *newstats;
1182 struct nft_stats *stats;
1183 int err;
1184
1185 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1186 if (err < 0)
ff3cd7b3 1187 return ERR_PTR(err);
0ca743a5
PNA		 1188
1189 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1190 return ERR_PTR(-EINVAL);
0ca743a5 1191
ce355e20 1192 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1193 if (newstats == NULL)
ff3cd7b3 1194 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1195
1196 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1197 * are not exposed to userspace.
1198 */
e8781f70 1199 preempt_disable();
0ca743a5
PNA		 1200 stats = this_cpu_ptr(newstats);
1201 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1202 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1203 preempt_enable();
0ca743a5 1204
ff3cd7b3
PNA		 1205 return newstats;
1206}
1207
1208static void nft_chain_stats_replace(struct nft_base_chain *chain,
1209 struct nft_stats __percpu *newstats)
1210{
b88825de
PNA		 1211 if (newstats == NULL)
1212 return;
1213
0ca743a5 1214 if (chain->stats) {
0ca743a5 1215 struct nft_stats __percpu *oldstats =
67a8fc27 1216 nft_dereference(chain->stats);
0ca743a5
PNA		 1217
1218 rcu_assign_pointer(chain->stats, newstats);
1219 synchronize_rcu();
1220 free_percpu(oldstats);
1221 } else
1222 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1223}
1224
91c7b38d
PNA		 1225static void nf_tables_chain_destroy(struct nft_chain *chain)
1226{
1227 BUG_ON(chain->use > 0);
1228
f323d954 1229 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1230 struct nft_base_chain *basechain = nft_base_chain(chain);
1231
1232 module_put(basechain->type->owner);
1233 free_percpu(basechain->stats);
1234 if (basechain->ops[0].dev != NULL)
1235 dev_put(basechain->ops[0].dev);
1236 kfree(basechain);
91c7b38d
PNA		 1237 } else {
1238 kfree(chain);
1239 }
1240}
1241
508f8ccd
PNA		 1242struct nft_chain_hook {
1243 u32 num;
1244 u32 priority;
1245 const struct nf_chain_type *type;
1246 struct net_device *dev;
1247};
1248
1249static int nft_chain_parse_hook(struct net *net,
1250 const struct nlattr * const nla[],
1251 struct nft_af_info *afi,
1252 struct nft_chain_hook *hook, bool create)
1253{
1254 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1255 const struct nf_chain_type *type;
1256 struct net_device *dev;
1257 int err;
1258
1259 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1260 nft_hook_policy);
1261 if (err < 0)
1262 return err;
1263
1264 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1265 ha[NFTA_HOOK_PRIORITY] == NULL)
1266 return -EINVAL;
1267
1268 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1269 if (hook->num >= afi->nhooks)
1270 return -EINVAL;
1271
1272 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1273
1274 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1275 if (nla[NFTA_CHAIN_TYPE]) {
1276 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1277 create);
1278 if (IS_ERR(type))
1279 return PTR_ERR(type);
1280 }
1281 if (!(type->hook_mask & (1 << hook->num)))
1282 return -EOPNOTSUPP;
1283 if (!try_module_get(type->owner))
1284 return -ENOENT;
1285
1286 hook->type = type;
1287
1288 hook->dev = NULL;
1289 if (afi->flags & NFT_AF_NEEDS_DEV) {
1290 char ifname[IFNAMSIZ];
1291
1292 if (!ha[NFTA_HOOK_DEV]) {
1293 module_put(type->owner);
1294 return -EOPNOTSUPP;
1295 }
1296
1297 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1298 dev = dev_get_by_name(net, ifname);
1299 if (!dev) {
1300 module_put(type->owner);
1301 return -ENOENT;
1302 }
1303 hook->dev = dev;
1304 } else if (ha[NFTA_HOOK_DEV]) {
1305 module_put(type->owner);
1306 return -EOPNOTSUPP;
1307 }
1308
1309 return 0;
1310}
1311
1312static void nft_chain_release_hook(struct nft_chain_hook *hook)
1313{
1314 module_put(hook->type->owner);
1315 if (hook->dev != NULL)
1316 dev_put(hook->dev);
1317}
1318
633c9a84
PNA		 1319static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1320 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1321 const struct nlattr * const nla[])
1322{
1323 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1324 const struct nlattr * uninitialized_var(name);
7c95f6d8 1325 struct nft_af_info *afi;
96518518
PM		 1326 struct nft_table *table;
1327 struct nft_chain *chain;
0ca743a5 1328 struct nft_base_chain *basechain = NULL;
f2a6d766 1329 u8 genmask = nft_genmask_next(net);
96518518 1330 int family = nfmsg->nfgen_family;
57de2a0c 1331 u8 policy = NF_ACCEPT;
96518518 1332 u64 handle = 0;
115a60b1 1333 unsigned int i;
ff3cd7b3 1334 struct nft_stats __percpu *stats;
96518518
PM		 1335 int err;
1336 bool create;
91c7b38d 1337 struct nft_ctx ctx;
96518518
PM		 1338
1339 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1340
99633ab2 1341 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1342 if (IS_ERR(afi))
1343 return PTR_ERR(afi);
1344
f2a6d766 1345 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1346 if (IS_ERR(table))
1347 return PTR_ERR(table);
1348
96518518
PM		 1349 chain = NULL;
1350 name = nla[NFTA_CHAIN_NAME];
1351
1352 if (nla[NFTA_CHAIN_HANDLE]) {
1353 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1354 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1355 if (IS_ERR(chain))
1356 return PTR_ERR(chain);
1357 } else {
664b0f8c 1358 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1359 if (IS_ERR(chain)) {
1360 if (PTR_ERR(chain) != -ENOENT)
1361 return PTR_ERR(chain);
1362 chain = NULL;
1363 }
1364 }
1365
57de2a0c 1366 if (nla[NFTA_CHAIN_POLICY]) {
f323d954
PNA		 1367 if (chain != NULL &&
1368 !nft_is_base_chain(chain))
d6b6cb1d
PNA		 1369 return -EOPNOTSUPP;
1370
1371 if (chain == NULL &&
57de2a0c
PM		 1372 nla[NFTA_CHAIN_HOOK] == NULL)
1373 return -EOPNOTSUPP;
1374
8f46df18 1375 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1376 switch (policy) {
1377 case NF_DROP:
1378 case NF_ACCEPT:
1379 break;
1380 default:
1381 return -EINVAL;
1382 }
1383 }
1384
96518518 1385 if (chain != NULL) {
91c7b38d
PNA		 1386 struct nft_stats *stats = NULL;
1387 struct nft_trans *trans;
1388
96518518
PM		 1389 if (nlh->nlmsg_flags & NLM_F_EXCL)
1390 return -EEXIST;
1391 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1392 return -EOPNOTSUPP;
1393
6133740d
PNA		 1394 if (nla[NFTA_CHAIN_HOOK]) {
1395 struct nft_base_chain *basechain;
1396 struct nft_chain_hook hook;
1397 struct nf_hook_ops *ops;
1398
f323d954 1399 if (!nft_is_base_chain(chain))
6133740d
PNA		 1400 return -EBUSY;
1401
1402 err = nft_chain_parse_hook(net, nla, afi, &hook,
1403 create);
1404 if (err < 0)
1405 return err;
1406
1407 basechain = nft_base_chain(chain);
1408 if (basechain->type != hook.type) {
1409 nft_chain_release_hook(&hook);
1410 return -EBUSY;
1411 }
1412
1413 for (i = 0; i < afi->nops; i++) {
1414 ops = &basechain->ops[i];
1415 if (ops->hooknum != hook.num ||
1416 ops->priority != hook.priority ||
1417 ops->dev != hook.dev) {
1418 nft_chain_release_hook(&hook);
1419 return -EBUSY;
1420 }
1421 }
1422 nft_chain_release_hook(&hook);
1423 }
1424
664b0f8c
PNA		 1425 if (nla[NFTA_CHAIN_HANDLE] && name) {
1426 struct nft_chain *chain2;
1427
1428 chain2 = nf_tables_chain_lookup(table,
1429 nla[NFTA_CHAIN_NAME],
1430 genmask);
1431 if (IS_ERR(chain2))
1432 return PTR_ERR(chain2);
1433 }
96518518 1434
0ca743a5 1435 if (nla[NFTA_CHAIN_COUNTERS]) {
f323d954 1436 if (!nft_is_base_chain(chain))
0ca743a5
PNA		 1437 return -EOPNOTSUPP;
1438
ff3cd7b3
PNA		 1439 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1440 if (IS_ERR(stats))
1441 return PTR_ERR(stats);
0ca743a5
PNA		 1442 }
1443
633c9a84 1444 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1445 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1446 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1447 if (trans == NULL) {
1448 free_percpu(stats);
91c7b38d 1449 return -ENOMEM;
f5553c19 1450 }
4401a862 1451
91c7b38d
PNA		 1452 nft_trans_chain_stats(trans) = stats;
1453 nft_trans_chain_update(trans) = true;
4401a862 1454
91c7b38d
PNA		 1455 if (nla[NFTA_CHAIN_POLICY])
1456 nft_trans_chain_policy(trans) = policy;
1457 else
1458 nft_trans_chain_policy(trans) = -1;
96518518 1459
91c7b38d
PNA		 1460 if (nla[NFTA_CHAIN_HANDLE] && name) {
1461 nla_strlcpy(nft_trans_chain_name(trans), name,
1462 NFT_CHAIN_MAXNAMELEN);
1463 }
1464 list_add_tail(&trans->list, &net->nft.commit_list);
1465 return 0;
96518518
PM		 1466 }
1467
75820676
PM		 1468 if (table->use == UINT_MAX)
1469 return -EOVERFLOW;
1470
96518518 1471 if (nla[NFTA_CHAIN_HOOK]) {
508f8ccd 1472 struct nft_chain_hook hook;
96518518 1473 struct nf_hook_ops *ops;
9370761c 1474 nf_hookfn *hookfn;
96518518 1475
508f8ccd 1476 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
96518518
PM		 1477 if (err < 0)
1478 return err;
2cbce139 1479
96518518 1480 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19 1481 if (basechain == NULL) {
508f8ccd 1482 nft_chain_release_hook(&hook);
96518518 1483 return -ENOMEM;
f5553c19 1484 }
9370761c 1485
508f8ccd
PNA		 1486 if (hook.dev != NULL)
1487 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
2cbce139 1488
4401a862 1489 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1490 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1491 if (IS_ERR(stats)) {
508f8ccd 1492 nft_chain_release_hook(&hook);
4401a862 1493 kfree(basechain);
ff3cd7b3 1494 return PTR_ERR(stats);
4401a862 1495 }
ff3cd7b3 1496 basechain->stats = stats;
4401a862 1497 } else {
ce355e20 1498 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1499 if (stats == NULL) {
508f8ccd 1500 nft_chain_release_hook(&hook);
4401a862 1501 kfree(basechain);
c123bb71 1502 return -ENOMEM;
4401a862 1503 }
ff3cd7b3 1504 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1505 }
1506
508f8ccd
PNA		 1507 hookfn = hook.type->hooks[hook.num];
1508 basechain->type = hook.type;
96518518
PM		 1509 chain = &basechain->chain;
1510
115a60b1
PM		 1511 for (i = 0; i < afi->nops; i++) {
1512 ops = &basechain->ops[i];
1513 ops->pf = family;
508f8ccd
PNA		 1514 ops->hooknum = hook.num;
1515 ops->priority = hook.priority;
115a60b1
PM		 1516 ops->priv = chain;
1517 ops->hook = afi->hooks[ops->hooknum];
508f8ccd 1518 ops->dev = hook.dev;
115a60b1
PM		 1519 if (hookfn)
1520 ops->hook = hookfn;
1521 if (afi->hook_ops_init)
1522 afi->hook_ops_init(ops, i);
1523 }
96518518
PM		 1524
1525 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1526 basechain->policy = policy;
96518518
PM		 1527 } else {
1528 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1529 if (chain == NULL)
1530 return -ENOMEM;
1531 }
1532
1533 INIT_LIST_HEAD(&chain->rules);
1534 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1535 chain->table = table;
96518518
PM		 1536 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1537
82bec71d 1538 err = nf_tables_register_hooks(net, table, chain, afi->nops);
d8ee8f7c
PNA		 1539 if (err < 0)
1540 goto err1;
96518518 1541
633c9a84 1542 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1543 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1544 if (err < 0)
1545 goto err2;
96518518 1546
4fefee57 1547 table->use++;
e688a7f8 1548 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1549 return 0;
1550err2:
82bec71d 1551 nf_tables_unregister_hooks(net, table, chain, afi->nops);
91c7b38d
PNA		 1552err1:
1553 nf_tables_chain_destroy(chain);
1554 return err;
96518518
PM		 1555}
1556
633c9a84
PNA		 1557static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1558 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1559 const struct nlattr * const nla[])
1560{
1561 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1562 u8 genmask = nft_genmask_next(net);
7c95f6d8 1563 struct nft_af_info *afi;
96518518
PM		 1564 struct nft_table *table;
1565 struct nft_chain *chain;
1566 int family = nfmsg->nfgen_family;
91c7b38d 1567 struct nft_ctx ctx;
96518518 1568
99633ab2 1569 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1570 if (IS_ERR(afi))
1571 return PTR_ERR(afi);
1572
f2a6d766 1573 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1574 if (IS_ERR(table))
1575 return PTR_ERR(table);
1576
664b0f8c 1577 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1578 if (IS_ERR(chain))
1579 return PTR_ERR(chain);
4fefee57 1580 if (chain->use > 0)
96518518
PM		 1581 return -EBUSY;
1582
633c9a84 1583 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1584
ee01d542 1585 return nft_delchain(&ctx);
96518518
PM		 1586}
1587
96518518
PM		 1588/*
1589 * Expressions
1590 */
1591
1592/**
ef1f7df9
PM		 1593 * nft_register_expr - register nf_tables expr type
1594 * @ops: expr type
96518518 1595 *
ef1f7df9 1596 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1597 * success or a negative errno code otherwise.
1598 */
ef1f7df9 1599int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1600{
1601 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1602 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1603 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1604 else
e688a7f8 1605 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1606 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1607 return 0;
1608}
1609EXPORT_SYMBOL_GPL(nft_register_expr);
1610
1611/**
ef1f7df9
PM		 1612 * nft_unregister_expr - unregister nf_tables expr type
1613 * @ops: expr type
96518518 1614 *
ef1f7df9 1615 * Unregisters the expr typefor use with nf_tables.
96518518 1616 */
ef1f7df9 1617void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1618{
1619 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1620 list_del_rcu(&type->list);
96518518
PM		 1621 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1622}
1623EXPORT_SYMBOL_GPL(nft_unregister_expr);
1624
64d46806
PM		 1625static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1626 struct nlattr *nla)
96518518 1627{
ef1f7df9 1628 const struct nft_expr_type *type;
96518518 1629
ef1f7df9 1630 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1631 if (!nla_strcmp(nla, type->name) &&
1632 (!type->family || type->family == family))
ef1f7df9 1633 return type;
96518518
PM		 1634 }
1635 return NULL;
1636}
1637
64d46806
PM		 1638static const struct nft_expr_type *nft_expr_type_get(u8 family,
1639 struct nlattr *nla)
96518518 1640{
ef1f7df9 1641 const struct nft_expr_type *type;
96518518
PM		 1642
1643 if (nla == NULL)
1644 return ERR_PTR(-EINVAL);
1645
64d46806 1646 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1647 if (type != NULL && try_module_get(type->owner))
1648 return type;
96518518
PM		 1649
1650#ifdef CONFIG_MODULES
ef1f7df9 1651 if (type == NULL) {
64d46806
PM		 1652 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1653 request_module("nft-expr-%u-%.*s", family,
1654 nla_len(nla), (char *)nla_data(nla));
1655 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1656 if (__nft_expr_type_get(family, nla))
1657 return ERR_PTR(-EAGAIN);
1658
96518518
PM		 1659 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1660 request_module("nft-expr-%.*s",
1661 nla_len(nla), (char *)nla_data(nla));
1662 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1663 if (__nft_expr_type_get(family, nla))
96518518
PM		 1664 return ERR_PTR(-EAGAIN);
1665 }
1666#endif
1667 return ERR_PTR(-ENOENT);
1668}
1669
1670static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1671 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1672 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1673};
1674
1675static int nf_tables_fill_expr_info(struct sk_buff *skb,
1676 const struct nft_expr *expr)
1677{
ef1f7df9 1678 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1679 goto nla_put_failure;
1680
1681 if (expr->ops->dump) {
1682 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1683 if (data == NULL)
1684 goto nla_put_failure;
1685 if (expr->ops->dump(skb, expr) < 0)
1686 goto nla_put_failure;
1687 nla_nest_end(skb, data);
1688 }
1689
1690 return skb->len;
1691
1692nla_put_failure:
1693 return -1;
1694};
1695
0b2d8a7b
PM		 1696int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1697 const struct nft_expr *expr)
1698{
1699 struct nlattr *nest;
1700
1701 nest = nla_nest_start(skb, attr);
1702 if (!nest)
1703 goto nla_put_failure;
1704 if (nf_tables_fill_expr_info(skb, expr) < 0)
1705 goto nla_put_failure;
1706 nla_nest_end(skb, nest);
1707 return 0;
1708
1709nla_put_failure:
1710 return -1;
1711}
1712
96518518
PM		 1713struct nft_expr_info {
1714 const struct nft_expr_ops *ops;
ef1f7df9 1715 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1716};
1717
0ca743a5
PNA		 1718static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1719 const struct nlattr *nla,
96518518
PM		 1720 struct nft_expr_info *info)
1721{
ef1f7df9 1722 const struct nft_expr_type *type;
96518518 1723 const struct nft_expr_ops *ops;
ef1f7df9 1724 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1725 int err;
1726
ef1f7df9 1727 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1728 if (err < 0)
1729 return err;
1730
64d46806 1731 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1732 if (IS_ERR(type))
1733 return PTR_ERR(type);
1734
1735 if (tb[NFTA_EXPR_DATA]) {
1736 err = nla_parse_nested(info->tb, type->maxattr,
1737 tb[NFTA_EXPR_DATA], type->policy);
1738 if (err < 0)
1739 goto err1;
1740 } else
1741 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1742
1743 if (type->select_ops != NULL) {
0ca743a5
PNA		 1744 ops = type->select_ops(ctx,
1745 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1746 if (IS_ERR(ops)) {
1747 err = PTR_ERR(ops);
1748 goto err1;
1749 }
1750 } else
1751 ops = type->ops;
1752
96518518
PM		 1753 info->ops = ops;
1754 return 0;
ef1f7df9
PM		 1755
1756err1:
1757 module_put(type->owner);
1758 return err;
96518518
PM		 1759}
1760
1761static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1762 const struct nft_expr_info *info,
96518518
PM		 1763 struct nft_expr *expr)
1764{
1765 const struct nft_expr_ops *ops = info->ops;
1766 int err;
1767
1768 expr->ops = ops;
1769 if (ops->init) {
ef1f7df9 1770 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1771 if (err < 0)
1772 goto err1;
1773 }
1774
c56e3956
LZ		 1775 if (ops->validate) {
1776 const struct nft_data *data = NULL;
1777
1778 err = ops->validate(ctx, expr, &data);
1779 if (err < 0)
1780 goto err2;
1781 }
1782
96518518
PM		 1783 return 0;
1784
c56e3956
LZ		 1785err2:
1786 if (ops->destroy)
1787 ops->destroy(ctx, expr);
96518518
PM		 1788err1:
1789 expr->ops = NULL;
1790 return err;
1791}
1792
62472bce
PM		 1793static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1794 struct nft_expr *expr)
96518518
PM		 1795{
1796 if (expr->ops->destroy)
62472bce 1797 expr->ops->destroy(ctx, expr);
ef1f7df9 1798 module_put(expr->ops->type->owner);
96518518
PM		 1799}
1800
0b2d8a7b
PM		 1801struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1802 const struct nlattr *nla)
1803{
1804 struct nft_expr_info info;
1805 struct nft_expr *expr;
1806 int err;
1807
1808 err = nf_tables_expr_parse(ctx, nla, &info);
1809 if (err < 0)
1810 goto err1;
1811
1812 err = -ENOMEM;
1813 expr = kzalloc(info.ops->size, GFP_KERNEL);
1814 if (expr == NULL)
1815 goto err2;
1816
1817 err = nf_tables_newexpr(ctx, &info, expr);
1818 if (err < 0)
6cafaf47 1819 goto err3;
0b2d8a7b
PM		 1820
1821 return expr;
6cafaf47
LZ		 1822err3:
1823 kfree(expr);
0b2d8a7b
PM		 1824err2:
1825 module_put(info.ops->type->owner);
1826err1:
1827 return ERR_PTR(err);
1828}
1829
1830void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1831{
1832 nf_tables_expr_destroy(ctx, expr);
1833 kfree(expr);
1834}
1835
96518518
PM		 1836/*
1837 * Rules
1838 */
1839
1840static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1841 u64 handle)
1842{
1843 struct nft_rule *rule;
1844
1845 // FIXME: this sucks
1846 list_for_each_entry(rule, &chain->rules, list) {
1847 if (handle == rule->handle)
1848 return rule;
1849 }
1850
1851 return ERR_PTR(-ENOENT);
1852}
1853
1854static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1855 const struct nlattr *nla)
1856{
1857 if (nla == NULL)
1858 return ERR_PTR(-EINVAL);
1859
1860 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1861}
1862
1863static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 1864 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1865 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1866 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1867 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1868 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1869 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1870 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1871 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1872 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1873 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1874};
1875
84d7fce6
PNA		 1876static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1877 u32 portid, u32 seq, int event,
1878 u32 flags, int family,
96518518
PM		 1879 const struct nft_table *table,
1880 const struct nft_chain *chain,
1881 const struct nft_rule *rule)
1882{
1883 struct nlmsghdr *nlh;
1884 struct nfgenmsg *nfmsg;
1885 const struct nft_expr *expr, *next;
1886 struct nlattr *list;
5e948466 1887 const struct nft_rule *prule;
dedb67c4 1888 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 1889
dedb67c4 1890 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 1891 if (nlh == NULL)
1892 goto nla_put_failure;
1893
1894 nfmsg = nlmsg_data(nlh);
1895 nfmsg->nfgen_family = family;
1896 nfmsg->version = NFNETLINK_V0;
84d7fce6 1897 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1898
1899 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1900 goto nla_put_failure;
1901 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1902 goto nla_put_failure;
b46f6ded
ND		 1903 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1904 NFTA_RULE_PAD))
96518518
PM		 1905 goto nla_put_failure;
1906
5e948466 1907 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 1908 prule = list_prev_entry(rule, list);
5e948466 1909 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1910 cpu_to_be64(prule->handle),
1911 NFTA_RULE_PAD))
5e948466
EL		 1912 goto nla_put_failure;
1913 }
1914
96518518
PM		 1915 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1916 if (list == NULL)
1917 goto nla_put_failure;
1918 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1919 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1920 goto nla_put_failure;
96518518
PM		 1921 }
1922 nla_nest_end(skb, list);
1923
86f1ec32
PM		 1924 if (rule->udata) {
1925 struct nft_userdata *udata = nft_userdata(rule);
1926 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1927 udata->data) < 0)
1928 goto nla_put_failure;
1929 }
0768b3b3 1930
053c095a
JB		 1931 nlmsg_end(skb, nlh);
1932 return 0;
96518518
PM		 1933
1934nla_put_failure:
1935 nlmsg_trim(skb, nlh);
1936 return -1;
1937}
1938
25e94a99
PNA		 1939static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1940 const struct nft_rule *rule, int event)
96518518
PM		 1941{
1942 struct sk_buff *skb;
96518518
PM		 1943 int err;
1944
128ad332
PNA		 1945 if (!ctx->report &&
1946 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1947 return;
96518518 1948
96518518
PM		 1949 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1950 if (skb == NULL)
1951 goto err;
1952
84d7fce6
PNA		 1953 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1954 event, 0, ctx->afi->family, ctx->table,
35151d84 1955 ctx->chain, rule);
96518518
PM		 1956 if (err < 0) {
1957 kfree_skb(skb);
1958 goto err;
1959 }
1960
25e94a99
PNA		 1961 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1962 ctx->report, GFP_KERNEL);
1963 return;
96518518 1964err:
25e94a99 1965 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1966}
1967
6e1f760e
PNA		 1968struct nft_rule_dump_ctx {
1969 char table[NFT_TABLE_MAXNAMELEN];
1970 char chain[NFT_CHAIN_MAXNAMELEN];
1971};
1972
96518518
PM		 1973static int nf_tables_dump_rules(struct sk_buff *skb,
1974 struct netlink_callback *cb)
1975{
1976 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 1977 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 1978 const struct nft_af_info *afi;
1979 const struct nft_table *table;
1980 const struct nft_chain *chain;
1981 const struct nft_rule *rule;
1982 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1983 struct net *net = sock_net(skb->sk);
96518518
PM		 1984 int family = nfmsg->nfgen_family;
1985
e688a7f8 1986 rcu_read_lock();
38e029f1
PNA		 1987 cb->seq = net->nft.base_seq;
1988
e688a7f8 1989 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1990 if (family != NFPROTO_UNSPEC && family != afi->family)
1991 continue;
1992
e688a7f8 1993 list_for_each_entry_rcu(table, &afi->tables, list) {
6e1f760e
PNA		 1994 if (ctx && ctx->table[0] &&
1995 strcmp(ctx->table, table->name) != 0)
1996 continue;
1997
e688a7f8 1998 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 1999 if (ctx && ctx->chain[0] &&
2000 strcmp(ctx->chain, chain->name) != 0)
2001 continue;
2002
e688a7f8 2003 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2004 if (!nft_is_active(net, rule))
0628b123 2005 goto cont;
96518518
PM		 2006 if (idx < s_idx)
2007 goto cont;
2008 if (idx > s_idx)
2009 memset(&cb->args[1], 0,
2010 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2011 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2012 cb->nlh->nlmsg_seq,
2013 NFT_MSG_NEWRULE,
2014 NLM_F_MULTI | NLM_F_APPEND,
2015 afi->family, table, chain, rule) < 0)
2016 goto done;
38e029f1
PNA		 2017
2018 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2019cont:
2020 idx++;
2021 }
2022 }
2023 }
2024 }
2025done:
e688a7f8
PNA		 2026 rcu_read_unlock();
2027
96518518
PM		 2028 cb->args[0] = idx;
2029 return skb->len;
2030}
2031
6e1f760e
PNA		 2032static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2033{
2034 kfree(cb->data);
2035 return 0;
2036}
2037
7b8002a1
PNA		 2038static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2039 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2040 const struct nlattr * const nla[])
2041{
2042 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2043 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2044 const struct nft_af_info *afi;
2045 const struct nft_table *table;
2046 const struct nft_chain *chain;
2047 const struct nft_rule *rule;
2048 struct sk_buff *skb2;
2049 int family = nfmsg->nfgen_family;
2050 int err;
2051
2052 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2053 struct netlink_dump_control c = {
2054 .dump = nf_tables_dump_rules,
6e1f760e 2055 .done = nf_tables_dump_rules_done,
96518518 2056 };
6e1f760e
PNA		 2057
2058 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2059 struct nft_rule_dump_ctx *ctx;
2060
2061 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2062 if (!ctx)
2063 return -ENOMEM;
2064
2065 if (nla[NFTA_RULE_TABLE])
2066 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2067 sizeof(ctx->table));
2068 if (nla[NFTA_RULE_CHAIN])
2069 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2070 sizeof(ctx->chain));
2071 c.data = ctx;
2072 }
2073
96518518
PM		 2074 return netlink_dump_start(nlsk, skb, nlh, &c);
2075 }
2076
99633ab2 2077 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2078 if (IS_ERR(afi))
2079 return PTR_ERR(afi);
2080
f2a6d766 2081 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2082 if (IS_ERR(table))
2083 return PTR_ERR(table);
2084
664b0f8c 2085 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2086 if (IS_ERR(chain))
2087 return PTR_ERR(chain);
2088
2089 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2090 if (IS_ERR(rule))
2091 return PTR_ERR(rule);
2092
2093 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2094 if (!skb2)
2095 return -ENOMEM;
2096
84d7fce6 2097 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2098 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2099 family, table, chain, rule);
2100 if (err < 0)
2101 goto err;
2102
2103 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2104
2105err:
2106 kfree_skb(skb2);
2107 return err;
2108}
2109
62472bce
PM		 2110static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2111 struct nft_rule *rule)
96518518 2112{
96518518
PM		 2113 struct nft_expr *expr;
2114
2115 /*
2116 * Careful: some expressions might not be initialized in case this
2117 * is called on error from nf_tables_newrule().
2118 */
2119 expr = nft_expr_first(rule);
3e38df13 2120 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2121 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2122 expr = nft_expr_next(expr);
2123 }
2124 kfree(rule);
2125}
2126
1081d11b
PNA		 2127#define NFT_RULE_MAXEXPRS 128
2128
2129static struct nft_expr_info *info;
2130
633c9a84
PNA		 2131static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2132 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2133 const struct nlattr * const nla[])
2134{
2135 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2136 u8 genmask = nft_genmask_next(net);
7c95f6d8 2137 struct nft_af_info *afi;
96518518
PM		 2138 struct nft_table *table;
2139 struct nft_chain *chain;
2140 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2141 struct nft_userdata *udata;
1081d11b 2142 struct nft_trans *trans = NULL;
96518518
PM		 2143 struct nft_expr *expr;
2144 struct nft_ctx ctx;
2145 struct nlattr *tmp;
86f1ec32 2146 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2147 int err, rem;
2148 bool create;
5e948466 2149 u64 handle, pos_handle;
96518518
PM		 2150
2151 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2152
99633ab2 2153 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2154 if (IS_ERR(afi))
2155 return PTR_ERR(afi);
2156
f2a6d766 2157 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2158 if (IS_ERR(table))
2159 return PTR_ERR(table);
2160
664b0f8c 2161 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2162 if (IS_ERR(chain))
2163 return PTR_ERR(chain);
2164
2165 if (nla[NFTA_RULE_HANDLE]) {
2166 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2167 rule = __nf_tables_rule_lookup(chain, handle);
2168 if (IS_ERR(rule))
2169 return PTR_ERR(rule);
2170
2171 if (nlh->nlmsg_flags & NLM_F_EXCL)
2172 return -EEXIST;
2173 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2174 old_rule = rule;
2175 else
2176 return -EOPNOTSUPP;
2177 } else {
2178 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2179 return -EINVAL;
2180 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2181
2182 if (chain->use == UINT_MAX)
2183 return -EOVERFLOW;
96518518
PM		 2184 }
2185
5e948466
EL		 2186 if (nla[NFTA_RULE_POSITION]) {
2187 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2188 return -EOPNOTSUPP;
2189
2190 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2191 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2192 if (IS_ERR(old_rule))
2193 return PTR_ERR(old_rule);
2194 }
2195
633c9a84 2196 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2197
96518518
PM		 2198 n = 0;
2199 size = 0;
2200 if (nla[NFTA_RULE_EXPRESSIONS]) {
2201 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2202 err = -EINVAL;
2203 if (nla_type(tmp) != NFTA_LIST_ELEM)
2204 goto err1;
2205 if (n == NFT_RULE_MAXEXPRS)
2206 goto err1;
0ca743a5 2207 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2208 if (err < 0)
2209 goto err1;
2210 size += info[n].ops->size;
2211 n++;
2212 }
2213 }
9889840f
PM		 2214 /* Check for overflow of dlen field */
2215 err = -EFBIG;
2216 if (size >= 1 << 12)
2217 goto err1;
96518518 2218
86f1ec32 2219 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2220 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2221 if (ulen > 0)
2222 usize = sizeof(struct nft_userdata) + ulen;
2223 }
0768b3b3 2224
96518518 2225 err = -ENOMEM;
86f1ec32 2226 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2227 if (rule == NULL)
2228 goto err1;
2229
889f7ee7 2230 nft_activate_next(net, rule);
0628b123 2231
96518518
PM		 2232 rule->handle = handle;
2233 rule->dlen = size;
86f1ec32 2234 rule->udata = ulen ? 1 : 0;
0768b3b3 2235
86f1ec32
PM		 2236 if (ulen) {
2237 udata = nft_userdata(rule);
2238 udata->len = ulen - 1;
2239 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2240 }
96518518 2241
96518518
PM		 2242 expr = nft_expr_first(rule);
2243 for (i = 0; i < n; i++) {
2244 err = nf_tables_newexpr(&ctx, &info[i], expr);
2245 if (err < 0)
2246 goto err2;
ef1f7df9 2247 info[i].ops = NULL;
96518518
PM		 2248 expr = nft_expr_next(expr);
2249 }
2250
96518518 2251 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2252 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2253 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2254 old_rule);
1081d11b 2255 if (trans == NULL) {
0628b123
PNA		 2256 err = -ENOMEM;
2257 goto err2;
2258 }
889f7ee7 2259 nft_deactivate_next(net, old_rule);
ac34b861 2260 chain->use--;
5bc5c307 2261 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2262 } else {
2263 err = -ENOENT;
2264 goto err2;
2265 }
96518518 2266 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2267 if (old_rule)
2268 list_add_rcu(&rule->list, &old_rule->list);
2269 else
2270 list_add_tail_rcu(&rule->list, &chain->rules);
2271 else {
2272 if (old_rule)
2273 list_add_tail_rcu(&rule->list, &old_rule->list);
2274 else
2275 list_add_rcu(&rule->list, &chain->rules);
2276 }
96518518 2277
b380e5c7 2278 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2279 err = -ENOMEM;
2280 goto err3;
2281 }
4fefee57 2282 chain->use++;
96518518
PM		 2283 return 0;
2284
0628b123
PNA		 2285err3:
2286 list_del_rcu(&rule->list);
96518518 2287err2:
62472bce 2288 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2289err1:
2290 for (i = 0; i < n; i++) {
2291 if (info[i].ops != NULL)
ef1f7df9 2292 module_put(info[i].ops->type->owner);
96518518
PM		 2293 }
2294 return err;
2295}
2296
1a94e38d
PNA		 2297static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2298 const struct nlattr *nla)
2299{
2300 u32 id = ntohl(nla_get_be32(nla));
2301 struct nft_trans *trans;
2302
2303 list_for_each_entry(trans, &net->nft.commit_list, list) {
2304 struct nft_rule *rule = nft_trans_rule(trans);
2305
2306 if (trans->msg_type == NFT_MSG_NEWRULE &&
2307 id == nft_trans_rule_id(trans))
2308 return rule;
2309 }
2310 return ERR_PTR(-ENOENT);
2311}
2312
633c9a84
PNA		 2313static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2314 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2315 const struct nlattr * const nla[])
2316{
2317 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2318 u8 genmask = nft_genmask_next(net);
7c95f6d8 2319 struct nft_af_info *afi;
7c95f6d8 2320 struct nft_table *table;
cf9dc09d
PNA		 2321 struct nft_chain *chain = NULL;
2322 struct nft_rule *rule;
0628b123
PNA		 2323 int family = nfmsg->nfgen_family, err = 0;
2324 struct nft_ctx ctx;
96518518 2325
99633ab2 2326 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2327 if (IS_ERR(afi))
2328 return PTR_ERR(afi);
2329
f2a6d766 2330 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2331 if (IS_ERR(table))
2332 return PTR_ERR(table);
2333
cf9dc09d 2334 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2335 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2336 genmask);
cf9dc09d
PNA		 2337 if (IS_ERR(chain))
2338 return PTR_ERR(chain);
2339 }
96518518 2340
633c9a84 2341 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2342
cf9dc09d
PNA		 2343 if (chain) {
2344 if (nla[NFTA_RULE_HANDLE]) {
2345 rule = nf_tables_rule_lookup(chain,
2346 nla[NFTA_RULE_HANDLE]);
2347 if (IS_ERR(rule))
2348 return PTR_ERR(rule);
96518518 2349
1a94e38d
PNA		 2350 err = nft_delrule(&ctx, rule);
2351 } else if (nla[NFTA_RULE_ID]) {
2352 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2353 if (IS_ERR(rule))
2354 return PTR_ERR(rule);
2355
5e266fe7 2356 err = nft_delrule(&ctx, rule);
cf9dc09d 2357 } else {
ce24b721 2358 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2359 }
2360 } else {
2361 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2362 if (!nft_is_active_next(net, chain))
2363 continue;
2364
cf9dc09d 2365 ctx.chain = chain;
ce24b721 2366 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2367 if (err < 0)
2368 break;
2369 }
2370 }
2371
2372 return err;
2373}
2374
20a69341
PM		 2375/*
2376 * Sets
2377 */
2378
2379static LIST_HEAD(nf_tables_set_ops);
2380
2381int nft_register_set(struct nft_set_ops *ops)
2382{
2383 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2384 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2385 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2386 return 0;
2387}
2388EXPORT_SYMBOL_GPL(nft_register_set);
2389
2390void nft_unregister_set(struct nft_set_ops *ops)
2391{
2392 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2393 list_del_rcu(&ops->list);
20a69341
PM		 2394 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2395}
2396EXPORT_SYMBOL_GPL(nft_unregister_set);
2397
c50b960c
PM		 2398/*
2399 * Select a set implementation based on the data characteristics and the
2400 * given policy. The total memory use might not be known if no size is
2401 * given, in that case the amount of memory per element is used.
2402 */
2403static const struct nft_set_ops *
2404nft_select_set_ops(const struct nlattr * const nla[],
2405 const struct nft_set_desc *desc,
2406 enum nft_set_policies policy)
20a69341 2407{
c50b960c
PM		 2408 const struct nft_set_ops *ops, *bops;
2409 struct nft_set_estimate est, best;
20a69341
PM		 2410 u32 features;
2411
2412#ifdef CONFIG_MODULES
2413 if (list_empty(&nf_tables_set_ops)) {
2414 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2415 request_module("nft-set");
2416 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2417 if (!list_empty(&nf_tables_set_ops))
2418 return ERR_PTR(-EAGAIN);
2419 }
2420#endif
2421 features = 0;
2422 if (nla[NFTA_SET_FLAGS] != NULL) {
2423 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
7286ff7f
PNA		 2424 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2425 NFT_SET_OBJECT;
20a69341
PM		 2426 }
2427
55af753c
PNA		 2428 bops = NULL;
2429 best.size = ~0;
2430 best.lookup = ~0;
0b5a7874 2431 best.space = ~0;
c50b960c 2432
20a69341
PM		 2433 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2434 if ((ops->features & features) != features)
2435 continue;
c50b960c
PM		 2436 if (!ops->estimate(desc, features, &est))
2437 continue;
2438
2439 switch (policy) {
2440 case NFT_SET_POL_PERFORMANCE:
55af753c 2441 if (est.lookup < best.lookup)
c50b960c 2442 break;
0b5a7874
PNA		 2443 if (est.lookup == best.lookup) {
2444 if (!desc->size) {
2445 if (est.space < best.space)
2446 break;
2447 } else if (est.size < best.size) {
2448 break;
2449 }
2450 }
c50b960c
PM		 2451 continue;
2452 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2453 if (!desc->size) {
2454 if (est.space < best.space)
2455 break;
2456 if (est.space == best.space &&
2457 est.lookup < best.lookup)
2458 break;
2459 } else if (est.size < best.size) {
c50b960c 2460 break;
0b5a7874 2461 }
c50b960c
PM		 2462 continue;
2463 default:
2464 break;
2465 }
2466
20a69341
PM		 2467 if (!try_module_get(ops->owner))
2468 continue;
c50b960c
PM		 2469 if (bops != NULL)
2470 module_put(bops->owner);
2471
2472 bops = ops;
2473 best = est;
20a69341
PM		 2474 }
2475
c50b960c
PM		 2476 if (bops != NULL)
2477 return bops;
2478
20a69341
PM		 2479 return ERR_PTR(-EOPNOTSUPP);
2480}
2481
2482static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2483 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2484 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2485 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2486 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2487 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2488 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2489 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2490 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2491 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2492 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2493 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2494 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2495 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2496 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2497 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2498 .len = NFT_USERDATA_MAXLEN },
8aeff920 2499 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2500};
2501
2502static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2503 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2504};
2505
633c9a84 2506static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2507 const struct sk_buff *skb,
2508 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2509 const struct nlattr * const nla[],
2510 u8 genmask)
20a69341
PM		 2511{
2512 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2513 struct nft_af_info *afi = NULL;
2514 struct nft_table *table = NULL;
20a69341 2515
c9c8e485
PNA		 2516 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2517 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2518 if (IS_ERR(afi))
2519 return PTR_ERR(afi);
2520 }
20a69341
PM		 2521
2522 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2523 if (afi == NULL)
2524 return -EAFNOSUPPORT;
2525
f2a6d766
PNA		 2526 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2527 genmask);
20a69341
PM		 2528 if (IS_ERR(table))
2529 return PTR_ERR(table);
2530 }
2531
633c9a84 2532 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2533 return 0;
2534}
2535
c7a72e3f
PNA		 2536static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2537 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2538{
2539 struct nft_set *set;
2540
2541 if (nla == NULL)
2542 return ERR_PTR(-EINVAL);
2543
2544 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2545 if (!nla_strcmp(nla, set->name) &&
2546 nft_active_genmask(set, genmask))
20a69341
PM		 2547 return set;
2548 }
2549 return ERR_PTR(-ENOENT);
2550}
2551
c7a72e3f
PNA		 2552static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2553 const struct nlattr *nla,
2554 u8 genmask)
958bee14
PNA		 2555{
2556 struct nft_trans *trans;
2557 u32 id = ntohl(nla_get_be32(nla));
2558
2559 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2560 struct nft_set *set = nft_trans_set(trans);
2561
958bee14 2562 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2563 id == nft_trans_set_id(trans) &&
2564 nft_active_genmask(set, genmask))
2565 return set;
958bee14
PNA		 2566 }
2567 return ERR_PTR(-ENOENT);
2568}
c7a72e3f
PNA		 2569
2570struct nft_set *nft_set_lookup(const struct net *net,
2571 const struct nft_table *table,
2572 const struct nlattr *nla_set_name,
2573 const struct nlattr *nla_set_id,
2574 u8 genmask)
2575{
2576 struct nft_set *set;
2577
2578 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2579 if (IS_ERR(set)) {
2580 if (!nla_set_id)
2581 return set;
2582
2583 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2584 }
2585 return set;
2586}
2587EXPORT_SYMBOL_GPL(nft_set_lookup);
958bee14 2588
20a69341
PM		 2589static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2590 const char *name)
2591{
2592 const struct nft_set *i;
2593 const char *p;
2594 unsigned long *inuse;
60eb1894 2595 unsigned int n = 0, min = 0;
20a69341 2596
cb39ad8b 2597 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2598 if (p != NULL) {
2599 if (p[1] != 'd' || strchr(p + 2, '%'))
2600 return -EINVAL;
2601
2602 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2603 if (inuse == NULL)
2604 return -ENOMEM;
60eb1894 2605cont:
20a69341 2606 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2607 int tmp;
2608
37a9cc52
PNA		 2609 if (!nft_is_active_next(ctx->net, set))
2610 continue;
14662917 2611 if (!sscanf(i->name, name, &tmp))
20a69341 2612 continue;
60eb1894 2613 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2614 continue;
14662917 2615
60eb1894 2616 set_bit(tmp - min, inuse);
20a69341
PM		 2617 }
2618
53b70287 2619 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2620 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2621 min += BITS_PER_BYTE * PAGE_SIZE;
2622 memset(inuse, 0, PAGE_SIZE);
2623 goto cont;
2624 }
20a69341
PM		 2625 free_page((unsigned long)inuse);
2626 }
2627
60eb1894 2628 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341 2629 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2630 if (!nft_is_active_next(ctx->net, i))
2631 continue;
20a69341
PM		 2632 if (!strcmp(set->name, i->name))
2633 return -ENFILE;
2634 }
2635 return 0;
2636}
2637
2638static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2639 const struct nft_set *set, u16 event, u16 flags)
2640{
2641 struct nfgenmsg *nfmsg;
2642 struct nlmsghdr *nlh;
c50b960c 2643 struct nlattr *desc;
128ad332
PNA		 2644 u32 portid = ctx->portid;
2645 u32 seq = ctx->seq;
20a69341 2646
dedb67c4 2647 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 2648 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2649 flags);
2650 if (nlh == NULL)
2651 goto nla_put_failure;
2652
2653 nfmsg = nlmsg_data(nlh);
2654 nfmsg->nfgen_family = ctx->afi->family;
2655 nfmsg->version = NFNETLINK_V0;
84d7fce6 2656 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2657
2658 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2659 goto nla_put_failure;
2660 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2661 goto nla_put_failure;
2662 if (set->flags != 0)
2663 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2664 goto nla_put_failure;
2665
2666 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2667 goto nla_put_failure;
2668 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2669 goto nla_put_failure;
2670 if (set->flags & NFT_SET_MAP) {
2671 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2672 goto nla_put_failure;
2673 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2674 goto nla_put_failure;
2675 }
8aeff920
PNA		 2676 if (set->flags & NFT_SET_OBJECT &&
2677 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2678 goto nla_put_failure;
20a69341 2679
761da293 2680 if (set->timeout &&
d3e2a111
AP		 2681 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2682 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2683 NFTA_SET_PAD))
761da293
PM		 2684 goto nla_put_failure;
2685 if (set->gc_int &&
2686 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2687 goto nla_put_failure;
2688
9363dc4b
AB		 2689 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2690 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2691 goto nla_put_failure;
2692 }
2693
e6d8ecac
CFG		 2694 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2695 goto nla_put_failure;
2696
c50b960c
PM		 2697 desc = nla_nest_start(skb, NFTA_SET_DESC);
2698 if (desc == NULL)
2699 goto nla_put_failure;
2700 if (set->size &&
2701 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2702 goto nla_put_failure;
2703 nla_nest_end(skb, desc);
2704
053c095a
JB		 2705 nlmsg_end(skb, nlh);
2706 return 0;
20a69341
PM		 2707
2708nla_put_failure:
2709 nlmsg_trim(skb, nlh);
2710 return -1;
2711}
2712
25e94a99
PNA		 2713static void nf_tables_set_notify(const struct nft_ctx *ctx,
2714 const struct nft_set *set, int event,
2715 gfp_t gfp_flags)
20a69341
PM		 2716{
2717 struct sk_buff *skb;
128ad332 2718 u32 portid = ctx->portid;
20a69341
PM		 2719 int err;
2720
128ad332
PNA		 2721 if (!ctx->report &&
2722 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2723 return;
20a69341 2724
31f8441c 2725 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2726 if (skb == NULL)
2727 goto err;
2728
2729 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2730 if (err < 0) {
2731 kfree_skb(skb);
2732 goto err;
2733 }
2734
25e94a99
PNA		 2735 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2736 gfp_flags);
2737 return;
20a69341 2738err:
25e94a99 2739 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 2740}
2741
5b96af77 2742static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2743{
2744 const struct nft_set *set;
2745 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2746 struct nft_af_info *afi;
c9c8e485
PNA		 2747 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2748 struct net *net = sock_net(skb->sk);
2749 int cur_family = cb->args[3];
5b96af77 2750 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2751
2752 if (cb->args[1])
2753 return skb->len;
2754
e688a7f8 2755 rcu_read_lock();
38e029f1
PNA		 2756 cb->seq = net->nft.base_seq;
2757
e688a7f8 2758 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2759 if (ctx->afi && ctx->afi != afi)
2760 continue;
2761
c9c8e485
PNA		 2762 if (cur_family) {
2763 if (afi->family != cur_family)
2764 continue;
2765
2766 cur_family = 0;
2767 }
e688a7f8 2768 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2769 if (ctx->table && ctx->table != table)
2770 continue;
2771
c9c8e485
PNA		 2772 if (cur_table) {
2773 if (cur_table != table)
2774 continue;
2775
2776 cur_table = NULL;
2777 }
c9c8e485 2778 idx = 0;
5b96af77 2779 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2780 if (idx < s_idx)
2781 goto cont;
37a9cc52
PNA		 2782 if (!nft_is_active(net, set))
2783 goto cont;
5b96af77
PNA		 2784
2785 ctx_set = *ctx;
2786 ctx_set.table = table;
2787 ctx_set.afi = afi;
2788 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2789 NFT_MSG_NEWSET,
2790 NLM_F_MULTI) < 0) {
2791 cb->args[0] = idx;
2792 cb->args[2] = (unsigned long) table;
2793 cb->args[3] = afi->family;
2794 goto done;
2795 }
38e029f1 2796 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2797cont:
2798 idx++;
2799 }
2800 if (s_idx)
2801 s_idx = 0;
2802 }
2803 }
2804 cb->args[1] = 1;
2805done:
e688a7f8 2806 rcu_read_unlock();
c9c8e485
PNA		 2807 return skb->len;
2808}
2809
5b96af77 2810static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2811{
5b96af77
PNA		 2812 kfree(cb->data);
2813 return 0;
20a69341
PM		 2814}
2815
7b8002a1
PNA		 2816static int nf_tables_getset(struct net *net, struct sock *nlsk,
2817 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2818 const struct nlattr * const nla[])
2819{
f2a6d766 2820 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2821 const struct nft_set *set;
2822 struct nft_ctx ctx;
2823 struct sk_buff *skb2;
c9c8e485 2824 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2825 int err;
2826
01cfa0a4 2827 /* Verify existence before starting dump */
f2a6d766 2828 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2829 if (err < 0)
2830 return err;
2831
2832 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2833 struct netlink_dump_control c = {
2834 .dump = nf_tables_dump_sets,
5b96af77 2835 .done = nf_tables_dump_sets_done,
20a69341 2836 };
5b96af77
PNA		 2837 struct nft_ctx *ctx_dump;
2838
2839 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2840 if (ctx_dump == NULL)
2841 return -ENOMEM;
2842
2843 *ctx_dump = ctx;
2844 c.data = ctx_dump;
2845
20a69341
PM		 2846 return netlink_dump_start(nlsk, skb, nlh, &c);
2847 }
2848
c9c8e485
PNA		 2849 /* Only accept unspec with dump */
2850 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2851 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2852 if (!nla[NFTA_SET_TABLE])
2853 return -EINVAL;
c9c8e485 2854
37a9cc52 2855 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2856 if (IS_ERR(set))
2857 return PTR_ERR(set);
2858
2859 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2860 if (skb2 == NULL)
2861 return -ENOMEM;
2862
2863 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2864 if (err < 0)
2865 goto err;
2866
2867 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2868
2869err:
2870 kfree_skb(skb2);
2871 return err;
2872}
2873
c50b960c
PM		 2874static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2875 struct nft_set_desc *desc,
2876 const struct nlattr *nla)
2877{
2878 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2879 int err;
2880
2881 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2882 if (err < 0)
2883 return err;
2884
2885 if (da[NFTA_SET_DESC_SIZE] != NULL)
2886 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2887
2888 return 0;
2889}
2890
633c9a84
PNA		 2891static int nf_tables_newset(struct net *net, struct sock *nlsk,
2892 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2893 const struct nlattr * const nla[])
2894{
2895 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2896 u8 genmask = nft_genmask_next(net);
20a69341 2897 const struct nft_set_ops *ops;
7c95f6d8 2898 struct nft_af_info *afi;
20a69341
PM		 2899 struct nft_table *table;
2900 struct nft_set *set;
2901 struct nft_ctx ctx;
cb39ad8b 2902 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2903 unsigned int size;
2904 bool create;
761da293 2905 u64 timeout;
8aeff920 2906 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 2907 struct nft_set_desc desc;
e6d8ecac
CFG		 2908 unsigned char *udata;
2909 u16 udlen;
20a69341
PM		 2910 int err;
2911
2912 if (nla[NFTA_SET_TABLE] == NULL ||
2913 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2914 nla[NFTA_SET_KEY_LEN] == NULL ||
2915 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2916 return -EINVAL;
2917
c50b960c
PM		 2918 memset(&desc, 0, sizeof(desc));
2919
20a69341
PM		 2920 ktype = NFT_DATA_VALUE;
2921 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2922 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2923 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2924 return -EINVAL;
2925 }
2926
c50b960c 2927 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2928 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2929 return -EINVAL;
2930
2931 flags = 0;
2932 if (nla[NFTA_SET_FLAGS] != NULL) {
2933 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2934 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 2935 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 2936 NFT_SET_MAP | NFT_SET_EVAL |
2937 NFT_SET_OBJECT))
20a69341 2938 return -EINVAL;
8aeff920
PNA		 2939 /* Only one of these operations is supported */
2940 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2941 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 2942 return -EOPNOTSUPP;
20a69341
PM		 2943 }
2944
2945 dtype = 0;
20a69341
PM		 2946 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2947 if (!(flags & NFT_SET_MAP))
2948 return -EINVAL;
2949
2950 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2951 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2952 dtype != NFT_DATA_VERDICT)
2953 return -EINVAL;
2954
2955 if (dtype != NFT_DATA_VERDICT) {
2956 if (nla[NFTA_SET_DATA_LEN] == NULL)
2957 return -EINVAL;
c50b960c 2958 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2959 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2960 return -EINVAL;
2961 } else
7d740264 2962 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2963 } else if (flags & NFT_SET_MAP)
2964 return -EINVAL;
2965
8aeff920
PNA		 2966 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2967 if (!(flags & NFT_SET_OBJECT))
2968 return -EINVAL;
2969
2970 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2971 if (objtype == NFT_OBJECT_UNSPEC ||
2972 objtype > NFT_OBJECT_MAX)
2973 return -EINVAL;
2974 } else if (flags & NFT_SET_OBJECT)
2975 return -EINVAL;
2976 else
2977 objtype = NFT_OBJECT_UNSPEC;
2978
761da293
PM		 2979 timeout = 0;
2980 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2981 if (!(flags & NFT_SET_TIMEOUT))
2982 return -EINVAL;
d3e2a111
AP		 2983 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2984 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 2985 }
2986 gc_int = 0;
2987 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2988 if (!(flags & NFT_SET_TIMEOUT))
2989 return -EINVAL;
2990 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2991 }
2992
c50b960c
PM		 2993 policy = NFT_SET_POL_PERFORMANCE;
2994 if (nla[NFTA_SET_POLICY] != NULL)
2995 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2996
2997 if (nla[NFTA_SET_DESC] != NULL) {
2998 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2999 if (err < 0)
3000 return err;
3001 }
3002
20a69341
PM		 3003 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3004
99633ab2 3005 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 3006 if (IS_ERR(afi))
3007 return PTR_ERR(afi);
3008
f2a6d766 3009 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 3010 if (IS_ERR(table))
3011 return PTR_ERR(table);
3012
633c9a84 3013 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3014
37a9cc52 3015 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3016 if (IS_ERR(set)) {
3017 if (PTR_ERR(set) != -ENOENT)
3018 return PTR_ERR(set);
1a28ad74 3019 } else {
20a69341
PM		 3020 if (nlh->nlmsg_flags & NLM_F_EXCL)
3021 return -EEXIST;
3022 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3023 return -EOPNOTSUPP;
3024 return 0;
3025 }
3026
3027 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3028 return -ENOENT;
3029
c50b960c 3030 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 3031 if (IS_ERR(ops))
3032 return PTR_ERR(ops);
3033
e6d8ecac
CFG		 3034 udlen = 0;
3035 if (nla[NFTA_SET_USERDATA])
3036 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3037
20a69341
PM		 3038 size = 0;
3039 if (ops->privsize != NULL)
3040 size = ops->privsize(nla);
3041
3042 err = -ENOMEM;
e6d8ecac 3043 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 3044 if (set == NULL)
3045 goto err1;
3046
3047 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3048 err = nf_tables_set_alloc_name(&ctx, set, name);
3049 if (err < 0)
3050 goto err2;
3051
e6d8ecac
CFG		 3052 udata = NULL;
3053 if (udlen) {
3054 udata = set->data + size;
3055 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3056 }
3057
20a69341
PM		 3058 INIT_LIST_HEAD(&set->bindings);
3059 set->ops = ops;
3060 set->ktype = ktype;
c50b960c 3061 set->klen = desc.klen;
20a69341 3062 set->dtype = dtype;
8aeff920 3063 set->objtype = objtype;
c50b960c 3064 set->dlen = desc.dlen;
20a69341 3065 set->flags = flags;
c50b960c 3066 set->size = desc.size;
9363dc4b 3067 set->policy = policy;
e6d8ecac
CFG		 3068 set->udlen = udlen;
3069 set->udata = udata;
761da293
PM		 3070 set->timeout = timeout;
3071 set->gc_int = gc_int;
20a69341 3072
c50b960c 3073 err = ops->init(set, &desc, nla);
20a69341
PM		 3074 if (err < 0)
3075 goto err2;
3076
958bee14 3077 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3078 if (err < 0)
c17c3cdf 3079 goto err3;
20a69341 3080
e688a7f8 3081 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3082 table->use++;
20a69341
PM		 3083 return 0;
3084
c17c3cdf
LZ		 3085err3:
3086 ops->destroy(set);
20a69341
PM		 3087err2:
3088 kfree(set);
3089err1:
3090 module_put(ops->owner);
3091 return err;
3092}
3093
958bee14 3094static void nft_set_destroy(struct nft_set *set)
20a69341 3095{
20a69341
PM		 3096 set->ops->destroy(set);
3097 module_put(set->ops->owner);
3098 kfree(set);
3099}
3100
958bee14
PNA		 3101static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3102{
e688a7f8 3103 list_del_rcu(&set->list);
31f8441c 3104 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3105 nft_set_destroy(set);
3106}
3107
633c9a84
PNA		 3108static int nf_tables_delset(struct net *net, struct sock *nlsk,
3109 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3110 const struct nlattr * const nla[])
3111{
c9c8e485 3112 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3113 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3114 struct nft_set *set;
3115 struct nft_ctx ctx;
3116 int err;
3117
ec2c9935
PM		 3118 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3119 return -EAFNOSUPPORT;
20a69341
PM		 3120 if (nla[NFTA_SET_TABLE] == NULL)
3121 return -EINVAL;
3122
f2a6d766 3123 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3124 if (err < 0)
3125 return err;
3126
37a9cc52 3127 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3128 if (IS_ERR(set))
3129 return PTR_ERR(set);
3130 if (!list_empty(&set->bindings))
3131 return -EBUSY;
3132
ee01d542 3133 return nft_delset(&ctx, set);
20a69341
PM		 3134}
3135
3136static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3137 struct nft_set *set,
20a69341 3138 const struct nft_set_iter *iter,
de70185d 3139 struct nft_set_elem *elem)
20a69341 3140{
fe2811eb 3141 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3142 enum nft_registers dreg;
3143
3144 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3145 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3146 set->dtype == NFT_DATA_VERDICT ?
3147 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3148 set->dlen);
20a69341
PM		 3149}
3150
3151int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3152 struct nft_set_binding *binding)
3153{
3154 struct nft_set_binding *i;
3155 struct nft_set_iter iter;
3156
3157 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3158 return -EBUSY;
3159
11113e19 3160 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3161 /* If the set is already bound to the same chain all
3162 * jumps are already validated for that chain.
3163 */
3164 list_for_each_entry(i, &set->bindings, list) {
a4684402 3165 if (i->flags & NFT_SET_MAP &&
11113e19 3166 i->chain == binding->chain)
20a69341
PM		 3167 goto bind;
3168 }
3169
8588ac09 3170 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3171 iter.skip = 0;
3172 iter.count = 0;
3173 iter.err = 0;
3174 iter.fn = nf_tables_bind_check_setelem;
3175
3176 set->ops->walk(ctx, set, &iter);
a02f4248 3177 if (iter.err < 0)
20a69341 3178 return iter.err;
20a69341
PM		 3179 }
3180bind:
3181 binding->chain = ctx->chain;
e688a7f8 3182 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3183 return 0;
3184}
63aea290 3185EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3186
3187void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3188 struct nft_set_binding *binding)
3189{
e688a7f8 3190 list_del_rcu(&binding->list);
20a69341 3191
958bee14 3192 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 3193 nft_is_active(ctx->net, set))
20a69341
PM		 3194 nf_tables_set_destroy(ctx, set);
3195}
63aea290 3196EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3197
3ac4c07a
PM		 3198const struct nft_set_ext_type nft_set_ext_types[] = {
3199 [NFT_SET_EXT_KEY] = {
7d740264 3200 .align = __alignof__(u32),
3ac4c07a
PM		 3201 },
3202 [NFT_SET_EXT_DATA] = {
7d740264 3203 .align = __alignof__(u32),
3ac4c07a 3204 },
f25ad2e9
PM		 3205 [NFT_SET_EXT_EXPR] = {
3206 .align = __alignof__(struct nft_expr),
3207 },
8aeff920
PNA		 3208 [NFT_SET_EXT_OBJREF] = {
3209 .len = sizeof(struct nft_object *),
3210 .align = __alignof__(struct nft_object *),
3211 },
3ac4c07a
PM		 3212 [NFT_SET_EXT_FLAGS] = {
3213 .len = sizeof(u8),
3214 .align = __alignof__(u8),
3215 },
c3e1b005
PM		 3216 [NFT_SET_EXT_TIMEOUT] = {
3217 .len = sizeof(u64),
3218 .align = __alignof__(u64),
3219 },
3220 [NFT_SET_EXT_EXPIRATION] = {
3221 .len = sizeof(unsigned long),
3222 .align = __alignof__(unsigned long),
3223 },
68e942e8
PM		 3224 [NFT_SET_EXT_USERDATA] = {
3225 .len = sizeof(struct nft_userdata),
3226 .align = __alignof__(struct nft_userdata),
3227 },
3ac4c07a
PM		 3228};
3229EXPORT_SYMBOL_GPL(nft_set_ext_types);
3230
20a69341
PM		 3231/*
3232 * Set elements
3233 */
3234
3235static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3236 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3237 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3238 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3239 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3240 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3241 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3242};
3243
3244static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3245 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3246 .len = NFT_TABLE_MAXNAMELEN - 1 },
3247 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3248 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3249 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3250 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3251};
3252
633c9a84 3253static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3254 const struct sk_buff *skb,
3255 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3256 const struct nlattr * const nla[],
3257 u8 genmask)
20a69341
PM		 3258{
3259 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3260 struct nft_af_info *afi;
3261 struct nft_table *table;
20a69341 3262
99633ab2 3263 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3264 if (IS_ERR(afi))
3265 return PTR_ERR(afi);
3266
f2a6d766
PNA		 3267 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3268 genmask);
20a69341
PM		 3269 if (IS_ERR(table))
3270 return PTR_ERR(table);
3271
633c9a84 3272 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3273 return 0;
3274}
3275
3276static int nf_tables_fill_setelem(struct sk_buff *skb,
3277 const struct nft_set *set,
3278 const struct nft_set_elem *elem)
3279{
fe2811eb 3280 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3281 unsigned char *b = skb_tail_pointer(skb);
3282 struct nlattr *nest;
3283
3284 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3285 if (nest == NULL)
3286 goto nla_put_failure;
3287
fe2811eb
PM		 3288 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3289 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3290 goto nla_put_failure;
3291
fe2811eb
PM		 3292 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3293 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3294 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3295 set->dlen) < 0)
3296 goto nla_put_failure;
3297
f25ad2e9
PM		 3298 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3299 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3300 goto nla_put_failure;
3301
8aeff920
PNA		 3302 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3303 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3304 (*nft_set_ext_obj(ext))->name) < 0)
3305 goto nla_put_failure;
3306
fe2811eb
PM		 3307 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3308 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3309 htonl(*nft_set_ext_flags(ext))))
3310 goto nla_put_failure;
20a69341 3311
c3e1b005
PM		 3312 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3313 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3314 cpu_to_be64(jiffies_to_msecs(
3315 *nft_set_ext_timeout(ext))),
b46f6ded 3316 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3317 goto nla_put_failure;
3318
3319 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3320 unsigned long expires, now = jiffies;
3321
3322 expires = *nft_set_ext_expiration(ext);
3323 if (time_before(now, expires))
3324 expires -= now;
3325 else
3326 expires = 0;
3327
3328 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3329 cpu_to_be64(jiffies_to_msecs(expires)),
3330 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3331 goto nla_put_failure;
3332 }
3333
68e942e8
PM		 3334 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3335 struct nft_userdata *udata;
3336
3337 udata = nft_set_ext_userdata(ext);
3338 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3339 udata->len + 1, udata->data))
3340 goto nla_put_failure;
3341 }
3342
20a69341
PM		 3343 nla_nest_end(skb, nest);
3344 return 0;
3345
3346nla_put_failure:
3347 nlmsg_trim(skb, b);
3348 return -EMSGSIZE;
3349}
3350
3351struct nft_set_dump_args {
3352 const struct netlink_callback *cb;
3353 struct nft_set_iter iter;
3354 struct sk_buff *skb;
3355};
3356
3357static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3358 struct nft_set *set,
20a69341 3359 const struct nft_set_iter *iter,
de70185d 3360 struct nft_set_elem *elem)
20a69341
PM		 3361{
3362 struct nft_set_dump_args *args;
3363
3364 args = container_of(iter, struct nft_set_dump_args, iter);
3365 return nf_tables_fill_setelem(args->skb, set, elem);
3366}
3367
3368static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3369{
633c9a84 3370 struct net *net = sock_net(skb->sk);
f2a6d766 3371 u8 genmask = nft_genmask_cur(net);
de70185d 3372 struct nft_set *set;
20a69341
PM		 3373 struct nft_set_dump_args args;
3374 struct nft_ctx ctx;
3375 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3376 struct nfgenmsg *nfmsg;
3377 struct nlmsghdr *nlh;
3378 struct nlattr *nest;
3379 u32 portid, seq;
3380 int event, err;
3381
720e0dfa
MN		 3382 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3383 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 3384 if (err < 0)
3385 return err;
3386
633c9a84 3387 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f2a6d766 3388 (void *)nla, genmask);
20a69341
PM		 3389 if (err < 0)
3390 return err;
3391
37a9cc52
PNA		 3392 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3393 genmask);
20a69341
PM		 3394 if (IS_ERR(set))
3395 return PTR_ERR(set);
3396
dedb67c4 3397 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3398 portid = NETLINK_CB(cb->skb).portid;
3399 seq = cb->nlh->nlmsg_seq;
3400
3401 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3402 NLM_F_MULTI);
3403 if (nlh == NULL)
3404 goto nla_put_failure;
3405
3406 nfmsg = nlmsg_data(nlh);
6403d962 3407 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3408 nfmsg->version = NFNETLINK_V0;
84d7fce6 3409 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3410
3411 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3412 goto nla_put_failure;
3413 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3414 goto nla_put_failure;
3415
3416 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3417 if (nest == NULL)
3418 goto nla_put_failure;
3419
8588ac09
PNA		 3420 args.cb = cb;
3421 args.skb = skb;
3422 args.iter.genmask = nft_genmask_cur(ctx.net);
3423 args.iter.skip = cb->args[0];
3424 args.iter.count = 0;
3425 args.iter.err = 0;
3426 args.iter.fn = nf_tables_dump_setelem;
20a69341
PM		 3427 set->ops->walk(&ctx, set, &args.iter);
3428
3429 nla_nest_end(skb, nest);
3430 nlmsg_end(skb, nlh);
3431
3432 if (args.iter.err && args.iter.err != -EMSGSIZE)
3433 return args.iter.err;
3434 if (args.iter.count == cb->args[0])
3435 return 0;
3436
3437 cb->args[0] = args.iter.count;
3438 return skb->len;
3439
3440nla_put_failure:
3441 return -ENOSPC;
3442}
3443
7b8002a1
PNA		 3444static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3445 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3446 const struct nlattr * const nla[])
3447{
f2a6d766 3448 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3449 const struct nft_set *set;
3450 struct nft_ctx ctx;
3451 int err;
3452
f2a6d766 3453 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3454 if (err < 0)
3455 return err;
3456
37a9cc52
PNA		 3457 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3458 genmask);
20a69341
PM		 3459 if (IS_ERR(set))
3460 return PTR_ERR(set);
3461
3462 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3463 struct netlink_dump_control c = {
3464 .dump = nf_tables_dump_set,
3465 };
3466 return netlink_dump_start(nlsk, skb, nlh, &c);
3467 }
3468 return -EOPNOTSUPP;
3469}
3470
d60ce62f
AB		 3471static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3472 const struct nft_ctx *ctx, u32 seq,
3473 u32 portid, int event, u16 flags,
3474 const struct nft_set *set,
3475 const struct nft_set_elem *elem)
3476{
3477 struct nfgenmsg *nfmsg;
3478 struct nlmsghdr *nlh;
3479 struct nlattr *nest;
3480 int err;
3481
dedb67c4 3482 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 3483 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3484 flags);
3485 if (nlh == NULL)
3486 goto nla_put_failure;
3487
3488 nfmsg = nlmsg_data(nlh);
3489 nfmsg->nfgen_family = ctx->afi->family;
3490 nfmsg->version = NFNETLINK_V0;
84d7fce6 3491 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3492
3493 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3494 goto nla_put_failure;
3495 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3496 goto nla_put_failure;
3497
3498 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3499 if (nest == NULL)
3500 goto nla_put_failure;
3501
3502 err = nf_tables_fill_setelem(skb, set, elem);
3503 if (err < 0)
3504 goto nla_put_failure;
3505
3506 nla_nest_end(skb, nest);
3507
053c095a
JB		 3508 nlmsg_end(skb, nlh);
3509 return 0;
d60ce62f
AB		 3510
3511nla_put_failure:
3512 nlmsg_trim(skb, nlh);
3513 return -1;
3514}
3515
25e94a99
PNA		 3516static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3517 const struct nft_set *set,
3518 const struct nft_set_elem *elem,
3519 int event, u16 flags)
d60ce62f 3520{
128ad332
PNA		 3521 struct net *net = ctx->net;
3522 u32 portid = ctx->portid;
d60ce62f
AB		 3523 struct sk_buff *skb;
3524 int err;
3525
128ad332 3526 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 3527 return;
d60ce62f 3528
d60ce62f
AB		 3529 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3530 if (skb == NULL)
3531 goto err;
3532
3533 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3534 set, elem);
3535 if (err < 0) {
3536 kfree_skb(skb);
3537 goto err;
3538 }
3539
25e94a99
PNA		 3540 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3541 GFP_KERNEL);
3542 return;
d60ce62f 3543err:
25e94a99 3544 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 3545}
3546
60319eb1
PNA		 3547static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3548 int msg_type,
3549 struct nft_set *set)
3550{
3551 struct nft_trans *trans;
3552
3553 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3554 if (trans == NULL)
3555 return NULL;
3556
3557 nft_trans_elem_set(trans) = set;
3558 return trans;
3559}
3560
22fe54d5
PM		 3561void *nft_set_elem_init(const struct nft_set *set,
3562 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3563 const u32 *key, const u32 *data,
22fe54d5 3564 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3565{
3566 struct nft_set_ext *ext;
3567 void *elem;
3568
3569 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3570 if (elem == NULL)
3571 return NULL;
3572
3573 ext = nft_set_elem_ext(set, elem);
3574 nft_set_ext_init(ext, tmpl);
3575
3576 memcpy(nft_set_ext_key(ext), key, set->klen);
3577 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3578 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3579 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3580 *nft_set_ext_expiration(ext) =
d3e2a111 3581 jiffies + timeout;
c3e1b005
PM		 3582 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3583 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3584
3585 return elem;
3586}
3587
61f9e292
LZ		 3588void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3589 bool destroy_expr)
61edafbb
PM		 3590{
3591 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3592
3593 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3594 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3595 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
61f9e292 3596 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3597 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3598 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3599 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3600 kfree(elem);
3601}
3602EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3603
0e9091d6
PNA		 3604static int nft_setelem_parse_flags(const struct nft_set *set,
3605 const struct nlattr *attr, u32 *flags)
3606{
3607 if (attr == NULL)
3608 return 0;
3609
3610 *flags = ntohl(nla_get_be32(attr));
3611 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3612 return -EINVAL;
3613 if (!(set->flags & NFT_SET_INTERVAL) &&
3614 *flags & NFT_SET_ELEM_INTERVAL_END)
3615 return -EINVAL;
3616
3617 return 0;
3618}
3619
60319eb1 3620static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3621 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3622{
3623 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3624 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3625 struct nft_data_desc d1, d2;
fe2811eb 3626 struct nft_set_ext_tmpl tmpl;
c016c7e4 3627 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3628 struct nft_set_elem elem;
3629 struct nft_set_binding *binding;
8aeff920 3630 struct nft_object *obj = NULL;
68e942e8 3631 struct nft_userdata *udata;
fe2811eb 3632 struct nft_data data;
20a69341 3633 enum nft_registers dreg;
60319eb1 3634 struct nft_trans *trans;
0e9091d6 3635 u32 flags = 0;
c3e1b005 3636 u64 timeout;
68e942e8 3637 u8 ulen;
20a69341
PM		 3638 int err;
3639
3640 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3641 nft_set_elem_policy);
3642 if (err < 0)
3643 return err;
3644
3645 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3646 return -EINVAL;
3647
fe2811eb
PM		 3648 nft_set_ext_prepare(&tmpl);
3649
0e9091d6
PNA		 3650 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3651 if (err < 0)
3652 return err;
3653 if (flags != 0)
3654 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3655
3656 if (set->flags & NFT_SET_MAP) {
3657 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3658 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3659 return -EINVAL;
bd7fc645 3660 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3661 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3662 return -EINVAL;
20a69341
PM		 3663 } else {
3664 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3665 return -EINVAL;
3666 }
3667
c3e1b005
PM		 3668 timeout = 0;
3669 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3670 if (!(set->flags & NFT_SET_TIMEOUT))
3671 return -EINVAL;
d3e2a111
AP		 3672 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3673 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3674 } else if (set->flags & NFT_SET_TIMEOUT) {
3675 timeout = set->timeout;
3676 }
3677
7d740264 3678 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3679 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3680 if (err < 0)
3681 goto err1;
3682 err = -EINVAL;
3683 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3684 goto err2;
3685
7d740264 3686 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3687 if (timeout > 0) {
3688 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3689 if (timeout != set->timeout)
3690 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3691 }
fe2811eb 3692
8aeff920
PNA		 3693 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3694 if (!(set->flags & NFT_SET_OBJECT)) {
3695 err = -EINVAL;
3696 goto err2;
3697 }
3698 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3699 set->objtype, genmask);
3700 if (IS_ERR(obj)) {
3701 err = PTR_ERR(obj);
3702 goto err2;
3703 }
3704 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3705 }
3706
20a69341 3707 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3708 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3709 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3710 if (err < 0)
3711 goto err2;
3712
3713 err = -EINVAL;
3714 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3715 goto err3;
3716
3717 dreg = nft_type_to_reg(set->dtype);
3718 list_for_each_entry(binding, &set->bindings, list) {
3719 struct nft_ctx bind_ctx = {
58c78e10 3720 .net = ctx->net,
20a69341
PM		 3721 .afi = ctx->afi,
3722 .table = ctx->table,
7c95f6d8 3723 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3724 };
3725
11113e19
PM		 3726 if (!(binding->flags & NFT_SET_MAP))
3727 continue;
3728
1ec10212
PM		 3729 err = nft_validate_register_store(&bind_ctx, dreg,
3730 &data,
3731 d2.type, d2.len);
20a69341
PM		 3732 if (err < 0)
3733 goto err3;
3734 }
fe2811eb 3735
7d740264 3736 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3737 }
3738
68e942e8
PM		 3739 /* The full maximum length of userdata can exceed the maximum
3740 * offset value (U8_MAX) for following extensions, therefor it
3741 * must be the last extension added.
3742 */
3743 ulen = 0;
3744 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3745 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3746 if (ulen > 0)
3747 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3748 ulen);
3749 }
3750
fe2811eb 3751 err = -ENOMEM;
7d740264 3752 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3753 timeout, GFP_KERNEL);
fe2811eb
PM		 3754 if (elem.priv == NULL)
3755 goto err3;
3756
3757 ext = nft_set_elem_ext(set, elem.priv);
3758 if (flags)
3759 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3760 if (ulen > 0) {
3761 udata = nft_set_ext_userdata(ext);
3762 udata->len = ulen - 1;
3763 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3764 }
8aeff920
PNA		 3765 if (obj) {
3766 *nft_set_ext_obj(ext) = obj;
3767 obj->use++;
3768 }
fe2811eb 3769
60319eb1
PNA		 3770 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3771 if (trans == NULL)
fe2811eb 3772 goto err4;
60319eb1 3773
69086658 3774 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 3775 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3776 if (err) {
3777 if (err == -EEXIST) {
8aeff920
PNA		 3778 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3779 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3780 memcmp(nft_set_ext_data(ext),
3781 nft_set_ext_data(ext2), set->dlen) != 0) ||
3782 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3783 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3784 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 3785 err = -EBUSY;
3786 else if (!(nlmsg_flags & NLM_F_EXCL))
3787 err = 0;
3788 }
fe2811eb 3789 goto err5;
c016c7e4 3790 }
20a69341 3791
35d0ac90
PNA		 3792 if (set->size &&
3793 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3794 err = -ENFILE;
3795 goto err6;
3796 }
3797
60319eb1 3798 nft_trans_elem(trans) = elem;
46bbafce 3799 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3800 return 0;
3801
35d0ac90 3802err6:
5cb82a38 3803 set->ops->remove(ctx->net, set, &elem);
fe2811eb 3804err5:
60319eb1 3805 kfree(trans);
fe2811eb
PM		 3806err4:
3807 kfree(elem.priv);
20a69341
PM		 3808err3:
3809 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3810 nft_data_uninit(&data, d2.type);
20a69341 3811err2:
7d740264 3812 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3813err1:
3814 return err;
3815}
3816
633c9a84
PNA		 3817static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3818 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3819 const struct nlattr * const nla[])
3820{
f2a6d766 3821 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3822 const struct nlattr *attr;
3823 struct nft_set *set;
3824 struct nft_ctx ctx;
60319eb1 3825 int rem, err = 0;
20a69341 3826
7d5570ca
PNA		 3827 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3828 return -EINVAL;
3829
f2a6d766 3830 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3831 if (err < 0)
3832 return err;
3833
37a9cc52
PNA		 3834 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3835 genmask);
958bee14
PNA		 3836 if (IS_ERR(set)) {
3837 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3838 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3839 nla[NFTA_SET_ELEM_LIST_SET_ID],
3840 genmask);
958bee14
PNA		 3841 }
3842 if (IS_ERR(set))
3843 return PTR_ERR(set);
3844 }
3845
20a69341
PM		 3846 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3847 return -EBUSY;
3848
3849 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 3850 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 3851 if (err < 0)
60319eb1 3852 break;
20a69341 3853 }
60319eb1 3854 return err;
20a69341
PM		 3855}
3856
60319eb1 3857static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3858 const struct nlattr *attr)
3859{
3860 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3861 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3862 struct nft_data_desc desc;
3863 struct nft_set_elem elem;
3971ca14 3864 struct nft_set_ext *ext;
60319eb1 3865 struct nft_trans *trans;
3971ca14
PNA		 3866 u32 flags = 0;
3867 void *priv;
20a69341
PM		 3868 int err;
3869
3870 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3871 nft_set_elem_policy);
3872 if (err < 0)
3873 goto err1;
3874
3875 err = -EINVAL;
3876 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3877 goto err1;
3878
3971ca14
PNA		 3879 nft_set_ext_prepare(&tmpl);
3880
3881 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3882 if (err < 0)
3883 return err;
3884 if (flags != 0)
3885 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3886
7d740264 3887 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3888 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3889 if (err < 0)
3890 goto err1;
3891
3892 err = -EINVAL;
3893 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3894 goto err2;
3895
3971ca14
PNA		 3896 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3897
3898 err = -ENOMEM;
3899 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3900 GFP_KERNEL);
3901 if (elem.priv == NULL)
3902 goto err2;
3903
3904 ext = nft_set_elem_ext(set, elem.priv);
3905 if (flags)
3906 *nft_set_ext_flags(ext) = flags;
3907
60319eb1 3908 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3909 if (trans == NULL) {
3910 err = -ENOMEM;
3971ca14 3911 goto err3;
609ccf08 3912 }
20a69341 3913
42a55769 3914 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 3915 if (priv == NULL) {
cc02e457 3916 err = -ENOENT;
3971ca14 3917 goto err4;
cc02e457 3918 }
3971ca14
PNA		 3919 kfree(elem.priv);
3920 elem.priv = priv;
cc02e457 3921
60319eb1 3922 nft_trans_elem(trans) = elem;
46bbafce 3923 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3924 return 0;
cc02e457 3925
3971ca14 3926err4:
cc02e457 3927 kfree(trans);
3971ca14
PNA		 3928err3:
3929 kfree(elem.priv);
20a69341 3930err2:
7d740264 3931 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3932err1:
3933 return err;
3934}
3935
8411b644 3936static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 3937 struct nft_set *set,
8411b644 3938 const struct nft_set_iter *iter,
de70185d 3939 struct nft_set_elem *elem)
8411b644
PNA		 3940{
3941 struct nft_trans *trans;
3942 int err;
3943
3944 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3945 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3946 if (!trans)
3947 return -ENOMEM;
3948
1ba1c414 3949 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 3950 err = -ENOENT;
3951 goto err1;
3952 }
b2c11e4b 3953 set->ndeact++;
8411b644 3954
de70185d
PNA		 3955 nft_trans_elem_set(trans) = set;
3956 nft_trans_elem(trans) = *elem;
8411b644
PNA		 3957 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3958
3959 return 0;
3960err1:
3961 kfree(trans);
3962 return err;
3963}
3964
633c9a84
PNA		 3965static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3966 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3967 const struct nlattr * const nla[])
3968{
f2a6d766 3969 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3970 const struct nlattr *attr;
3971 struct nft_set *set;
3972 struct nft_ctx ctx;
60319eb1 3973 int rem, err = 0;
20a69341 3974
f2a6d766 3975 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3976 if (err < 0)
3977 return err;
3978
37a9cc52
PNA		 3979 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3980 genmask);
20a69341
PM		 3981 if (IS_ERR(set))
3982 return PTR_ERR(set);
3983 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3984 return -EBUSY;
3985
8411b644 3986 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 3987 struct nft_set_iter iter = {
3988 .genmask = genmask,
3989 .fn = nft_flush_set,
8411b644 3990 };
baa2d42c 3991 set->ops->walk(&ctx, set, &iter);
8411b644 3992
baa2d42c 3993 return iter.err;
8411b644
PNA		 3994 }
3995
20a69341
PM		 3996 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3997 err = nft_del_setelem(&ctx, set, attr);
3998 if (err < 0)
60319eb1 3999 break;
4fefee57 4000
3dd0673a 4001 set->ndeact++;
20a69341 4002 }
60319eb1 4003 return err;
20a69341
PM		 4004}
4005
cfed7e1b
PM		 4006void nft_set_gc_batch_release(struct rcu_head *rcu)
4007{
4008 struct nft_set_gc_batch *gcb;
4009 unsigned int i;
4010
4011 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4012 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4013 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4014 kfree(gcb);
4015}
4016EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4017
4018struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4019 gfp_t gfp)
4020{
4021 struct nft_set_gc_batch *gcb;
4022
4023 gcb = kzalloc(sizeof(*gcb), gfp);
4024 if (gcb == NULL)
4025 return gcb;
4026 gcb->head.set = set;
4027 return gcb;
4028}
4029EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4030
e5009240
PNA		 4031/*
4032 * Stateful objects
4033 */
4034
4035/**
4036 * nft_register_obj- register nf_tables stateful object type
4037 * @obj: object type
4038 *
4039 * Registers the object type for use with nf_tables. Returns zero on
4040 * success or a negative errno code otherwise.
4041 */
4042int nft_register_obj(struct nft_object_type *obj_type)
4043{
4044 if (obj_type->type == NFT_OBJECT_UNSPEC)
4045 return -EINVAL;
4046
4047 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4048 list_add_rcu(&obj_type->list, &nf_tables_objects);
4049 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4050 return 0;
4051}
4052EXPORT_SYMBOL_GPL(nft_register_obj);
4053
4054/**
4055 * nft_unregister_obj - unregister nf_tables object type
4056 * @obj: object type
4057 *
4058 * Unregisters the object type for use with nf_tables.
4059 */
4060void nft_unregister_obj(struct nft_object_type *obj_type)
4061{
4062 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4063 list_del_rcu(&obj_type->list);
4064 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4065}
4066EXPORT_SYMBOL_GPL(nft_unregister_obj);
4067
4068struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4069 const struct nlattr *nla,
4070 u32 objtype, u8 genmask)
4071{
4072 struct nft_object *obj;
4073
4074 list_for_each_entry(obj, &table->objects, list) {
4075 if (!nla_strcmp(nla, obj->name) &&
4076 objtype == obj->type->type &&
4077 nft_active_genmask(obj, genmask))
4078 return obj;
4079 }
4080 return ERR_PTR(-ENOENT);
4081}
4082EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4083
4084static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4085 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4086 .len = NFT_TABLE_MAXNAMELEN - 1 },
4087 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4088 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4089 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4090 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4091};
4092
84fba055
FW		 4093static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4094 const struct nft_object_type *type,
e5009240
PNA		 4095 const struct nlattr *attr)
4096{
4097 struct nlattr *tb[type->maxattr + 1];
4098 struct nft_object *obj;
4099 int err;
4100
4101 if (attr) {
4102 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4103 if (err < 0)
4104 goto err1;
4105 } else {
4106 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4107 }
4108
4109 err = -ENOMEM;
4110 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4111 if (obj == NULL)
4112 goto err1;
4113
84fba055 4114 err = type->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240
PNA		 4115 if (err < 0)
4116 goto err2;
4117
4118 obj->type = type;
4119 return obj;
4120err2:
4121 kfree(obj);
4122err1:
4123 return ERR_PTR(err);
4124}
4125
4126static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4127 struct nft_object *obj, bool reset)
e5009240
PNA		 4128{
4129 struct nlattr *nest;
4130
4131 nest = nla_nest_start(skb, attr);
4132 if (!nest)
4133 goto nla_put_failure;
43da04a5 4134 if (obj->type->dump(skb, obj, reset) < 0)
e5009240
PNA		 4135 goto nla_put_failure;
4136 nla_nest_end(skb, nest);
4137 return 0;
4138
4139nla_put_failure:
4140 return -1;
4141}
4142
4143static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4144{
4145 const struct nft_object_type *type;
4146
4147 list_for_each_entry(type, &nf_tables_objects, list) {
4148 if (objtype == type->type)
4149 return type;
4150 }
4151 return NULL;
4152}
4153
4154static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4155{
4156 const struct nft_object_type *type;
4157
4158 type = __nft_obj_type_get(objtype);
4159 if (type != NULL && try_module_get(type->owner))
4160 return type;
4161
4162#ifdef CONFIG_MODULES
4163 if (type == NULL) {
4164 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4165 request_module("nft-obj-%u", objtype);
4166 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4167 if (__nft_obj_type_get(objtype))
4168 return ERR_PTR(-EAGAIN);
4169 }
4170#endif
4171 return ERR_PTR(-ENOENT);
4172}
4173
4174static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4175 struct sk_buff *skb, const struct nlmsghdr *nlh,
4176 const struct nlattr * const nla[])
4177{
4178 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4179 const struct nft_object_type *type;
4180 u8 genmask = nft_genmask_next(net);
4181 int family = nfmsg->nfgen_family;
4182 struct nft_af_info *afi;
4183 struct nft_table *table;
4184 struct nft_object *obj;
4185 struct nft_ctx ctx;
4186 u32 objtype;
4187 int err;
4188
4189 if (!nla[NFTA_OBJ_TYPE] ||
4190 !nla[NFTA_OBJ_NAME] ||
4191 !nla[NFTA_OBJ_DATA])
4192 return -EINVAL;
4193
4194 afi = nf_tables_afinfo_lookup(net, family, true);
4195 if (IS_ERR(afi))
4196 return PTR_ERR(afi);
4197
4198 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4199 if (IS_ERR(table))
4200 return PTR_ERR(table);
4201
4202 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4203 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4204 if (IS_ERR(obj)) {
4205 err = PTR_ERR(obj);
4206 if (err != -ENOENT)
4207 return err;
4208
1a28ad74 4209 } else {
e5009240
PNA		 4210 if (nlh->nlmsg_flags & NLM_F_EXCL)
4211 return -EEXIST;
4212
4213 return 0;
4214 }
4215
4216 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4217
4218 type = nft_obj_type_get(objtype);
4219 if (IS_ERR(type))
4220 return PTR_ERR(type);
4221
84fba055 4222 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4223 if (IS_ERR(obj)) {
4224 err = PTR_ERR(obj);
4225 goto err1;
4226 }
18965317 4227 obj->table = table;
e5009240
PNA		 4228 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4229
4230 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4231 if (err < 0)
4232 goto err2;
4233
4234 list_add_tail_rcu(&obj->list, &table->objects);
4235 table->use++;
4236 return 0;
4237err2:
4238 if (obj->type->destroy)
4239 obj->type->destroy(obj);
4240 kfree(obj);
4241err1:
4242 module_put(type->owner);
4243 return err;
4244}
4245
4246static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4247 u32 portid, u32 seq, int event, u32 flags,
4248 int family, const struct nft_table *table,
43da04a5 4249 struct nft_object *obj, bool reset)
e5009240
PNA		 4250{
4251 struct nfgenmsg *nfmsg;
4252 struct nlmsghdr *nlh;
4253
dedb67c4 4254 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 4255 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4256 if (nlh == NULL)
4257 goto nla_put_failure;
4258
4259 nfmsg = nlmsg_data(nlh);
4260 nfmsg->nfgen_family = family;
4261 nfmsg->version = NFNETLINK_V0;
4262 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4263
4264 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4265 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4266 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4267 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4268 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4269 goto nla_put_failure;
4270
4271 nlmsg_end(skb, nlh);
4272 return 0;
4273
4274nla_put_failure:
4275 nlmsg_trim(skb, nlh);
4276 return -1;
4277}
4278
a9fea2a3
PNA		 4279struct nft_obj_filter {
4280 char table[NFT_OBJ_MAXNAMELEN];
4281 u32 type;
4282};
4283
e5009240
PNA		 4284static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4285{
4286 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4287 const struct nft_af_info *afi;
4288 const struct nft_table *table;
e5009240 4289 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4290 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4291 struct net *net = sock_net(skb->sk);
4292 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4293 struct nft_object *obj;
4294 bool reset = false;
4295
4296 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4297 reset = true;
e5009240
PNA		 4298
4299 rcu_read_lock();
4300 cb->seq = net->nft.base_seq;
4301
4302 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4303 if (family != NFPROTO_UNSPEC && family != afi->family)
4304 continue;
4305
4306 list_for_each_entry_rcu(table, &afi->tables, list) {
4307 list_for_each_entry_rcu(obj, &table->objects, list) {
4308 if (!nft_is_active(net, obj))
4309 goto cont;
4310 if (idx < s_idx)
4311 goto cont;
4312 if (idx > s_idx)
4313 memset(&cb->args[1], 0,
4314 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4315 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4316 strcmp(filter->table, table->name))
4317 goto cont;
d21e540b
LZ		 4318 if (filter &&
4319 filter->type != NFT_OBJECT_UNSPEC &&
a9fea2a3
PNA		 4320 obj->type->type != filter->type)
4321 goto cont;
4322
e5009240
PNA		 4323 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4324 cb->nlh->nlmsg_seq,
4325 NFT_MSG_NEWOBJ,
4326 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4327 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4328 goto done;
4329
4330 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4331cont:
4332 idx++;
4333 }
4334 }
4335 }
4336done:
4337 rcu_read_unlock();
4338
4339 cb->args[0] = idx;
4340 return skb->len;
4341}
4342
a9fea2a3
PNA		 4343static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4344{
4345 kfree(cb->data);
4346
4347 return 0;
4348}
4349
4350static struct nft_obj_filter *
4351nft_obj_filter_alloc(const struct nlattr * const nla[])
4352{
4353 struct nft_obj_filter *filter;
4354
4355 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4356 if (!filter)
4357 return ERR_PTR(-ENOMEM);
4358
4359 if (nla[NFTA_OBJ_TABLE])
4360 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4361 NFT_TABLE_MAXNAMELEN);
4362 if (nla[NFTA_OBJ_TYPE])
4363 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4364
4365 return filter;
4366}
4367
e5009240
PNA		 4368static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4369 struct sk_buff *skb, const struct nlmsghdr *nlh,
4370 const struct nlattr * const nla[])
4371{
4372 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4373 u8 genmask = nft_genmask_cur(net);
4374 int family = nfmsg->nfgen_family;
4375 const struct nft_af_info *afi;
4376 const struct nft_table *table;
4377 struct nft_object *obj;
4378 struct sk_buff *skb2;
43da04a5 4379 bool reset = false;
e5009240
PNA		 4380 u32 objtype;
4381 int err;
4382
4383 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4384 struct netlink_dump_control c = {
4385 .dump = nf_tables_dump_obj,
a9fea2a3 4386 .done = nf_tables_dump_obj_done,
e5009240 4387 };
a9fea2a3
PNA		 4388
4389 if (nla[NFTA_OBJ_TABLE] ||
4390 nla[NFTA_OBJ_TYPE]) {
4391 struct nft_obj_filter *filter;
4392
4393 filter = nft_obj_filter_alloc(nla);
4394 if (IS_ERR(filter))
4395 return -ENOMEM;
4396
4397 c.data = filter;
4398 }
e5009240
PNA		 4399 return netlink_dump_start(nlsk, skb, nlh, &c);
4400 }
4401
4402 if (!nla[NFTA_OBJ_NAME] ||
4403 !nla[NFTA_OBJ_TYPE])
4404 return -EINVAL;
4405
4406 afi = nf_tables_afinfo_lookup(net, family, false);
4407 if (IS_ERR(afi))
4408 return PTR_ERR(afi);
4409
4410 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4411 if (IS_ERR(table))
4412 return PTR_ERR(table);
4413
4414 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4415 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4416 if (IS_ERR(obj))
4417 return PTR_ERR(obj);
4418
4419 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4420 if (!skb2)
4421 return -ENOMEM;
4422
43da04a5
PNA		 4423 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4424 reset = true;
4425
e5009240
PNA		 4426 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4427 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4428 family, table, obj, reset);
e5009240
PNA		 4429 if (err < 0)
4430 goto err;
4431
4432 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4433err:
4434 kfree_skb(skb2);
4435 return err;
e5009240
PNA		 4436}
4437
4438static void nft_obj_destroy(struct nft_object *obj)
4439{
4440 if (obj->type->destroy)
4441 obj->type->destroy(obj);
4442
4443 module_put(obj->type->owner);
4444 kfree(obj);
4445}
4446
4447static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4448 struct sk_buff *skb, const struct nlmsghdr *nlh,
4449 const struct nlattr * const nla[])
4450{
4451 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4452 u8 genmask = nft_genmask_next(net);
4453 int family = nfmsg->nfgen_family;
4454 struct nft_af_info *afi;
4455 struct nft_table *table;
4456 struct nft_object *obj;
4457 struct nft_ctx ctx;
4458 u32 objtype;
4459
4460 if (!nla[NFTA_OBJ_TYPE] ||
4461 !nla[NFTA_OBJ_NAME])
4462 return -EINVAL;
4463
4464 afi = nf_tables_afinfo_lookup(net, family, true);
4465 if (IS_ERR(afi))
4466 return PTR_ERR(afi);
4467
4468 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4469 if (IS_ERR(table))
4470 return PTR_ERR(table);
4471
4472 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4473 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4474 if (IS_ERR(obj))
4475 return PTR_ERR(obj);
4476 if (obj->use > 0)
4477 return -EBUSY;
4478
4479 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4480
4481 return nft_delobj(&ctx, obj);
4482}
4483
25e94a99
PNA		 4484void nft_obj_notify(struct net *net, struct nft_table *table,
4485 struct nft_object *obj, u32 portid, u32 seq, int event,
4486 int family, int report, gfp_t gfp)
e5009240
PNA		 4487{
4488 struct sk_buff *skb;
4489 int err;
4490
2599e989
PNA		 4491 if (!report &&
4492 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4493 return;
e5009240 4494
2599e989 4495 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4496 if (skb == NULL)
4497 goto err;
4498
2599e989
PNA		 4499 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4500 table, obj, false);
e5009240
PNA		 4501 if (err < 0) {
4502 kfree_skb(skb);
4503 goto err;
4504 }
4505
25e94a99
PNA		 4506 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4507 return;
e5009240 4508err:
25e94a99 4509 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 4510}
2599e989
PNA		 4511EXPORT_SYMBOL_GPL(nft_obj_notify);
4512
25e94a99
PNA		 4513static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4514 struct nft_object *obj, int event)
2599e989 4515{
25e94a99
PNA		 4516 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4517 ctx->afi->family, ctx->report, GFP_KERNEL);
2599e989 4518}
e5009240 4519
84d7fce6
PNA		 4520static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4521 u32 portid, u32 seq)
4522{
4523 struct nlmsghdr *nlh;
4524 struct nfgenmsg *nfmsg;
dedb67c4 4525 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 4526
4527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4528 if (nlh == NULL)
4529 goto nla_put_failure;
4530
4531 nfmsg = nlmsg_data(nlh);
4532 nfmsg->nfgen_family = AF_UNSPEC;
4533 nfmsg->version = NFNETLINK_V0;
4534 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4535
4536 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4537 goto nla_put_failure;
4538
053c095a
JB		 4539 nlmsg_end(skb, nlh);
4540 return 0;
84d7fce6
PNA		 4541
4542nla_put_failure:
4543 nlmsg_trim(skb, nlh);
4544 return -EMSGSIZE;
4545}
4546
25e94a99
PNA		 4547static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4548 int event)
84d7fce6
PNA		 4549{
4550 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4551 struct sk_buff *skb2;
4552 int err;
4553
4554 if (nlmsg_report(nlh) &&
4555 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4556 return;
84d7fce6 4557
84d7fce6
PNA		 4558 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4559 if (skb2 == NULL)
4560 goto err;
4561
4562 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4563 nlh->nlmsg_seq);
4564 if (err < 0) {
4565 kfree_skb(skb2);
4566 goto err;
4567 }
4568
25e94a99
PNA		 4569 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4570 nlmsg_report(nlh), GFP_KERNEL);
4571 return;
84d7fce6 4572err:
25e94a99
PNA		 4573 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4574 -ENOBUFS);
84d7fce6
PNA		 4575}
4576
7b8002a1
PNA		 4577static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4578 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 4579 const struct nlattr * const nla[])
4580{
84d7fce6
PNA		 4581 struct sk_buff *skb2;
4582 int err;
4583
4584 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4585 if (skb2 == NULL)
4586 return -ENOMEM;
4587
4588 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4589 nlh->nlmsg_seq);
4590 if (err < 0)
4591 goto err;
4592
4593 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4594err:
4595 kfree_skb(skb2);
4596 return err;
4597}
4598
96518518
PM		 4599static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4600 [NFT_MSG_NEWTABLE] = {
55dd6f93 4601 .call_batch = nf_tables_newtable,
96518518
PM		 4602 .attr_count = NFTA_TABLE_MAX,
4603 .policy = nft_table_policy,
4604 },
4605 [NFT_MSG_GETTABLE] = {
4606 .call = nf_tables_gettable,
4607 .attr_count = NFTA_TABLE_MAX,
4608 .policy = nft_table_policy,
4609 },
4610 [NFT_MSG_DELTABLE] = {
55dd6f93 4611 .call_batch = nf_tables_deltable,
96518518
PM		 4612 .attr_count = NFTA_TABLE_MAX,
4613 .policy = nft_table_policy,
4614 },
4615 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4616 .call_batch = nf_tables_newchain,
96518518
PM		 4617 .attr_count = NFTA_CHAIN_MAX,
4618 .policy = nft_chain_policy,
4619 },
4620 [NFT_MSG_GETCHAIN] = {
4621 .call = nf_tables_getchain,
4622 .attr_count = NFTA_CHAIN_MAX,
4623 .policy = nft_chain_policy,
4624 },
4625 [NFT_MSG_DELCHAIN] = {
91c7b38d 4626 .call_batch = nf_tables_delchain,
96518518
PM		 4627 .attr_count = NFTA_CHAIN_MAX,
4628 .policy = nft_chain_policy,
4629 },
4630 [NFT_MSG_NEWRULE] = {
0628b123 4631 .call_batch = nf_tables_newrule,
96518518
PM		 4632 .attr_count = NFTA_RULE_MAX,
4633 .policy = nft_rule_policy,
4634 },
4635 [NFT_MSG_GETRULE] = {
4636 .call = nf_tables_getrule,
4637 .attr_count = NFTA_RULE_MAX,
4638 .policy = nft_rule_policy,
4639 },
4640 [NFT_MSG_DELRULE] = {
0628b123 4641 .call_batch = nf_tables_delrule,
96518518
PM		 4642 .attr_count = NFTA_RULE_MAX,
4643 .policy = nft_rule_policy,
4644 },
20a69341 4645 [NFT_MSG_NEWSET] = {
958bee14 4646 .call_batch = nf_tables_newset,
20a69341
PM		 4647 .attr_count = NFTA_SET_MAX,
4648 .policy = nft_set_policy,
4649 },
4650 [NFT_MSG_GETSET] = {
4651 .call = nf_tables_getset,
4652 .attr_count = NFTA_SET_MAX,
4653 .policy = nft_set_policy,
4654 },
4655 [NFT_MSG_DELSET] = {
958bee14 4656 .call_batch = nf_tables_delset,
20a69341
PM		 4657 .attr_count = NFTA_SET_MAX,
4658 .policy = nft_set_policy,
4659 },
4660 [NFT_MSG_NEWSETELEM] = {
958bee14 4661 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4662 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4663 .policy = nft_set_elem_list_policy,
4664 },
4665 [NFT_MSG_GETSETELEM] = {
4666 .call = nf_tables_getsetelem,
4667 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4668 .policy = nft_set_elem_list_policy,
4669 },
4670 [NFT_MSG_DELSETELEM] = {
958bee14 4671 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4672 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4673 .policy = nft_set_elem_list_policy,
4674 },
84d7fce6
PNA		 4675 [NFT_MSG_GETGEN] = {
4676 .call = nf_tables_getgen,
4677 },
e5009240
PNA		 4678 [NFT_MSG_NEWOBJ] = {
4679 .call_batch = nf_tables_newobj,
4680 .attr_count = NFTA_OBJ_MAX,
4681 .policy = nft_obj_policy,
4682 },
4683 [NFT_MSG_GETOBJ] = {
4684 .call = nf_tables_getobj,
4685 .attr_count = NFTA_OBJ_MAX,
4686 .policy = nft_obj_policy,
4687 },
4688 [NFT_MSG_DELOBJ] = {
4689 .call_batch = nf_tables_delobj,
4690 .attr_count = NFTA_OBJ_MAX,
4691 .policy = nft_obj_policy,
4692 },
43da04a5
PNA		 4693 [NFT_MSG_GETOBJ_RESET] = {
4694 .call = nf_tables_getobj,
4695 .attr_count = NFTA_OBJ_MAX,
4696 .policy = nft_obj_policy,
4697 },
96518518
PM		 4698};
4699
91c7b38d
PNA		 4700static void nft_chain_commit_update(struct nft_trans *trans)
4701{
4702 struct nft_base_chain *basechain;
4703
4704 if (nft_trans_chain_name(trans)[0])
4705 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4706
f323d954 4707 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 4708 return;
4709
4710 basechain = nft_base_chain(trans->ctx.chain);
4711 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4712
4713 switch (nft_trans_chain_policy(trans)) {
4714 case NF_DROP:
4715 case NF_ACCEPT:
4716 basechain->policy = nft_trans_chain_policy(trans);
4717 break;
4718 }
4719}
4720
b326dd37 4721static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 4722{
c7c32e72
PNA		 4723 switch (trans->msg_type) {
4724 case NFT_MSG_DELTABLE:
4725 nf_tables_table_destroy(&trans->ctx);
4726 break;
4727 case NFT_MSG_DELCHAIN:
4728 nf_tables_chain_destroy(trans->ctx.chain);
4729 break;
4730 case NFT_MSG_DELRULE:
4731 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4732 break;
4733 case NFT_MSG_DELSET:
4734 nft_set_destroy(nft_trans_set(trans));
4735 break;
61edafbb
PM		 4736 case NFT_MSG_DELSETELEM:
4737 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4738 nft_trans_elem(trans).priv, true);
61edafbb 4739 break;
e5009240
PNA		 4740 case NFT_MSG_DELOBJ:
4741 nft_obj_destroy(nft_trans_obj(trans));
4742 break;
c7c32e72
PNA		 4743 }
4744 kfree(trans);
4745}
4746
5913beaf 4747static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 4748{
37082f93 4749 struct nft_trans *trans, *next;
a3716e70 4750 struct nft_trans_elem *te;
37082f93
PNA		 4751
4752 /* Bump generation counter, invalidate any dump in progress */
38e029f1 4753 while (++net->nft.base_seq == 0);
37082f93
PNA		 4754
4755 /* A new generation has just started */
ea4bd995 4756 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 4757
4758 /* Make sure all packets have left the previous generation before
4759 * purging old rules.
4760 */
4761 synchronize_rcu();
4762
4763 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 4764 switch (trans->msg_type) {
55dd6f93
PNA		 4765 case NFT_MSG_NEWTABLE:
4766 if (nft_trans_table_update(trans)) {
4767 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4768 nf_tables_table_disable(net,
4769 trans->ctx.afi,
55dd6f93
PNA		 4770 trans->ctx.table);
4771 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4772 }
4773 } else {
f2a6d766 4774 nft_clear(net, trans->ctx.table);
55dd6f93 4775 }
35151d84 4776 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 4777 nft_trans_destroy(trans);
4778 break;
4779 case NFT_MSG_DELTABLE:
f2a6d766 4780 list_del_rcu(&trans->ctx.table->list);
35151d84 4781 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 4782 break;
91c7b38d
PNA		 4783 case NFT_MSG_NEWCHAIN:
4784 if (nft_trans_chain_update(trans))
4785 nft_chain_commit_update(trans);
4fefee57 4786 else
664b0f8c 4787 nft_clear(net, trans->ctx.chain);
4fefee57 4788
35151d84 4789 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 4790 nft_trans_destroy(trans);
4791 break;
4792 case NFT_MSG_DELCHAIN:
664b0f8c 4793 list_del_rcu(&trans->ctx.chain->list);
35151d84 4794 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 4795 nf_tables_unregister_hooks(trans->ctx.net,
4796 trans->ctx.table,
c5598794
AB		 4797 trans->ctx.chain,
4798 trans->ctx.afi->nops);
91c7b38d 4799 break;
b380e5c7 4800 case NFT_MSG_NEWRULE:
889f7ee7 4801 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 4802 nf_tables_rule_notify(&trans->ctx,
37082f93 4803 nft_trans_rule(trans),
35151d84 4804 NFT_MSG_NEWRULE);
37082f93 4805 nft_trans_destroy(trans);
b380e5c7
PNA		 4806 break;
4807 case NFT_MSG_DELRULE:
4808 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 4809 nf_tables_rule_notify(&trans->ctx,
4810 nft_trans_rule(trans),
4811 NFT_MSG_DELRULE);
b380e5c7 4812 break;
958bee14 4813 case NFT_MSG_NEWSET:
37a9cc52 4814 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 4815 /* This avoids hitting -EBUSY when deleting the table
4816 * from the transaction.
4817 */
4818 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4819 !list_empty(&nft_trans_set(trans)->bindings))
4820 trans->ctx.table->use--;
4821
958bee14 4822 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4823 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4824 nft_trans_destroy(trans);
4825 break;
4826 case NFT_MSG_DELSET:
37a9cc52 4827 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 4828 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4829 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4830 break;
60319eb1 4831 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4832 te = (struct nft_trans_elem *)trans->data;
4833
42a55769 4834 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 4835 nf_tables_setelem_notify(&trans->ctx, te->set,
4836 &te->elem,
60319eb1
PNA		 4837 NFT_MSG_NEWSETELEM, 0);
4838 nft_trans_destroy(trans);
4839 break;
4840 case NFT_MSG_DELSETELEM:
a3716e70 4841 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4842
a3716e70
PNA		 4843 nf_tables_setelem_notify(&trans->ctx, te->set,
4844 &te->elem,
60319eb1 4845 NFT_MSG_DELSETELEM, 0);
5cb82a38 4846 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 4847 atomic_dec(&te->set->nelems);
4848 te->set->ndeact--;
60319eb1 4849 break;
e5009240
PNA		 4850 case NFT_MSG_NEWOBJ:
4851 nft_clear(net, nft_trans_obj(trans));
4852 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4853 NFT_MSG_NEWOBJ);
4854 nft_trans_destroy(trans);
4855 break;
4856 case NFT_MSG_DELOBJ:
4857 list_del_rcu(&nft_trans_obj(trans)->list);
4858 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4859 NFT_MSG_DELOBJ);
4860 break;
37082f93 4861 }
37082f93
PNA		 4862 }
4863
b326dd37
PNA		 4864 synchronize_rcu();
4865
37082f93 4866 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4867 list_del(&trans->list);
b326dd37 4868 nf_tables_commit_release(trans);
37082f93 4869 }
84d7fce6
PNA		 4870
4871 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4872
4873 return 0;
4874}
4875
b326dd37 4876static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4877{
c7c32e72
PNA		 4878 switch (trans->msg_type) {
4879 case NFT_MSG_NEWTABLE:
4880 nf_tables_table_destroy(&trans->ctx);
4881 break;
4882 case NFT_MSG_NEWCHAIN:
4883 nf_tables_chain_destroy(trans->ctx.chain);
4884 break;
4885 case NFT_MSG_NEWRULE:
4886 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4887 break;
4888 case NFT_MSG_NEWSET:
4889 nft_set_destroy(nft_trans_set(trans));
4890 break;
61edafbb
PM		 4891 case NFT_MSG_NEWSETELEM:
4892 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4893 nft_trans_elem(trans).priv, true);
61edafbb 4894 break;
e5009240
PNA		 4895 case NFT_MSG_NEWOBJ:
4896 nft_obj_destroy(nft_trans_obj(trans));
4897 break;
c7c32e72
PNA		 4898 }
4899 kfree(trans);
4900}
4901
5913beaf 4902static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4903{
37082f93 4904 struct nft_trans *trans, *next;
02263db0 4905 struct nft_trans_elem *te;
37082f93 4906
a907e36d
XL		 4907 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4908 list) {
b380e5c7 4909 switch (trans->msg_type) {
55dd6f93
PNA		 4910 case NFT_MSG_NEWTABLE:
4911 if (nft_trans_table_update(trans)) {
4912 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4913 nf_tables_table_disable(net,
4914 trans->ctx.afi,
55dd6f93
PNA		 4915 trans->ctx.table);
4916 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4917 }
4918 nft_trans_destroy(trans);
4919 } else {
e688a7f8 4920 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4921 }
4922 break;
4923 case NFT_MSG_DELTABLE:
f2a6d766 4924 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 4925 nft_trans_destroy(trans);
4926 break;
91c7b38d
PNA		 4927 case NFT_MSG_NEWCHAIN:
4928 if (nft_trans_chain_update(trans)) {
982f4051 4929 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4930
4931 nft_trans_destroy(trans);
4932 } else {
4fefee57 4933 trans->ctx.table->use--;
e688a7f8 4934 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 4935 nf_tables_unregister_hooks(trans->ctx.net,
4936 trans->ctx.table,
c5598794
AB		 4937 trans->ctx.chain,
4938 trans->ctx.afi->nops);
91c7b38d
PNA		 4939 }
4940 break;
4941 case NFT_MSG_DELCHAIN:
4fefee57 4942 trans->ctx.table->use++;
664b0f8c 4943 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 4944 nft_trans_destroy(trans);
4945 break;
b380e5c7 4946 case NFT_MSG_NEWRULE:
4fefee57 4947 trans->ctx.chain->use--;
b380e5c7
PNA		 4948 list_del_rcu(&nft_trans_rule(trans)->list);
4949 break;
4950 case NFT_MSG_DELRULE:
4fefee57 4951 trans->ctx.chain->use++;
889f7ee7 4952 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4953 nft_trans_destroy(trans);
b380e5c7 4954 break;
958bee14 4955 case NFT_MSG_NEWSET:
4fefee57 4956 trans->ctx.table->use--;
e688a7f8 4957 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4958 break;
4959 case NFT_MSG_DELSET:
4fefee57 4960 trans->ctx.table->use++;
37a9cc52 4961 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 4962 nft_trans_destroy(trans);
4963 break;
60319eb1 4964 case NFT_MSG_NEWSETELEM:
02263db0 4965 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4966
5cb82a38 4967 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 4968 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4969 break;
4970 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4971 te = (struct nft_trans_elem *)trans->data;
4972
42a55769 4973 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 4974 te->set->ndeact--;
cc02e457 4975
e5009240
PNA		 4976 nft_trans_destroy(trans);
4977 break;
4978 case NFT_MSG_NEWOBJ:
4979 trans->ctx.table->use--;
4980 list_del_rcu(&nft_trans_obj(trans)->list);
4981 break;
4982 case NFT_MSG_DELOBJ:
4983 trans->ctx.table->use++;
4984 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 4985 nft_trans_destroy(trans);
4986 break;
37082f93 4987 }
37082f93
PNA		 4988 }
4989
b326dd37
PNA		 4990 synchronize_rcu();
4991
a1cee076
PNA		 4992 list_for_each_entry_safe_reverse(trans, next,
4993 &net->nft.commit_list, list) {
c7c32e72 4994 list_del(&trans->list);
b326dd37 4995 nf_tables_abort_release(trans);
37082f93
PNA		 4996 }
4997
4998 return 0;
4999}
5000
74e8bcd2
PNA		 5001static bool nf_tables_valid_genid(struct net *net, u32 genid)
5002{
5003 return net->nft.base_seq == genid;
5004}
5005
96518518
PM		 5006static const struct nfnetlink_subsystem nf_tables_subsys = {
5007 .name = "nf_tables",
5008 .subsys_id = NFNL_SUBSYS_NFTABLES,
5009 .cb_count = NFT_MSG_MAX,
5010 .cb = nf_tables_cb,
0628b123
PNA		 5011 .commit = nf_tables_commit,
5012 .abort = nf_tables_abort,
74e8bcd2 5013 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5014};
5015
7210e4e3
PNA		 5016int nft_chain_validate_dependency(const struct nft_chain *chain,
5017 enum nft_chain_type type)
5018{
5019 const struct nft_base_chain *basechain;
5020
f323d954 5021 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 5022 basechain = nft_base_chain(chain);
5023 if (basechain->type->type != type)
5024 return -EOPNOTSUPP;
5025 }
5026 return 0;
5027}
5028EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5029
75e8d06d
PNA		 5030int nft_chain_validate_hooks(const struct nft_chain *chain,
5031 unsigned int hook_flags)
5032{
5033 struct nft_base_chain *basechain;
5034
f323d954 5035 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 5036 basechain = nft_base_chain(chain);
5037
5038 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5039 return 0;
5040
5041 return -EOPNOTSUPP;
5042 }
5043
5044 return 0;
5045}
5046EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5047
20a69341
PM		 5048/*
5049 * Loop detection - walk through the ruleset beginning at the destination chain
5050 * of a new jump until either the source chain is reached (loop) or all
5051 * reachable chains have been traversed.
5052 *
5053 * The loop check is performed whenever a new jump verdict is added to an
5054 * expression or verdict map or a verdict map is bound to a new chain.
5055 */
5056
5057static int nf_tables_check_loops(const struct nft_ctx *ctx,
5058 const struct nft_chain *chain);
5059
5060static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5061 struct nft_set *set,
20a69341 5062 const struct nft_set_iter *iter,
de70185d 5063 struct nft_set_elem *elem)
20a69341 5064{
fe2811eb
PM		 5065 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5066 const struct nft_data *data;
5067
5068 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5069 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5070 return 0;
5071
fe2811eb 5072 data = nft_set_ext_data(ext);
1ca2e170 5073 switch (data->verdict.code) {
20a69341
PM		 5074 case NFT_JUMP:
5075 case NFT_GOTO:
1ca2e170 5076 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5077 default:
5078 return 0;
5079 }
5080}
5081
5082static int nf_tables_check_loops(const struct nft_ctx *ctx,
5083 const struct nft_chain *chain)
5084{
5085 const struct nft_rule *rule;
5086 const struct nft_expr *expr, *last;
de70185d 5087 struct nft_set *set;
20a69341
PM		 5088 struct nft_set_binding *binding;
5089 struct nft_set_iter iter;
20a69341
PM		 5090
5091 if (ctx->chain == chain)
5092 return -ELOOP;
5093
5094 list_for_each_entry(rule, &chain->rules, list) {
5095 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5096 const struct nft_data *data = NULL;
5097 int err;
5098
5099 if (!expr->ops->validate)
20a69341
PM		 5100 continue;
5101
0ca743a5
PNA		 5102 err = expr->ops->validate(ctx, expr, &data);
5103 if (err < 0)
5104 return err;
5105
20a69341 5106 if (data == NULL)
0ca743a5 5107 continue;
20a69341 5108
1ca2e170 5109 switch (data->verdict.code) {
20a69341
PM		 5110 case NFT_JUMP:
5111 case NFT_GOTO:
1ca2e170
PM		 5112 err = nf_tables_check_loops(ctx,
5113 data->verdict.chain);
20a69341
PM		 5114 if (err < 0)
5115 return err;
5116 default:
5117 break;
5118 }
5119 }
5120 }
5121
5122 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5123 if (!nft_is_active_next(ctx->net, set))
5124 continue;
20a69341
PM		 5125 if (!(set->flags & NFT_SET_MAP) ||
5126 set->dtype != NFT_DATA_VERDICT)
5127 continue;
5128
5129 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5130 if (!(binding->flags & NFT_SET_MAP) ||
5131 binding->chain != chain)
20a69341
PM		 5132 continue;
5133
8588ac09 5134 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5135 iter.skip = 0;
5136 iter.count = 0;
5137 iter.err = 0;
5138 iter.fn = nf_tables_loop_check_setelem;
5139
5140 set->ops->walk(ctx, set, &iter);
5141 if (iter.err < 0)
5142 return iter.err;
5143 }
5144 }
5145
5146 return 0;
5147}
5148
36b701fa
LGL		 5149/**
5150 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5151 *
5152 * @attr: netlink attribute to fetch value from
5153 * @max: maximum value to be stored in dest
5154 * @dest: pointer to the variable
5155 *
5156 * Parse, check and store a given u32 netlink attribute into variable.
5157 * This function returns -ERANGE if the value goes over maximum value.
5158 * Otherwise a 0 is returned and the attribute value is stored in the
5159 * destination variable.
5160 */
f1d505bb 5161int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5162{
09525a09 5163 u32 val;
36b701fa
LGL		 5164
5165 val = ntohl(nla_get_be32(attr));
5166 if (val > max)
5167 return -ERANGE;
5168
5169 *dest = val;
5170 return 0;
5171}
5172EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5173
49499c3e
PM		 5174/**
5175 * nft_parse_register - parse a register value from a netlink attribute
5176 *
5177 * @attr: netlink attribute
5178 *
5179 * Parse and translate a register value from a netlink attribute.
5180 * Registers used to be 128 bit wide, these register numbers will be
5181 * mapped to the corresponding 32 bit register numbers.
5182 */
b1c96ed3
PM		 5183unsigned int nft_parse_register(const struct nlattr *attr)
5184{
49499c3e
PM		 5185 unsigned int reg;
5186
5187 reg = ntohl(nla_get_be32(attr));
5188 switch (reg) {
5189 case NFT_REG_VERDICT...NFT_REG_4:
5190 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5191 default:
5192 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5193 }
b1c96ed3
PM		 5194}
5195EXPORT_SYMBOL_GPL(nft_parse_register);
5196
49499c3e
PM		 5197/**
5198 * nft_dump_register - dump a register value to a netlink attribute
5199 *
5200 * @skb: socket buffer
5201 * @attr: attribute number
5202 * @reg: register number
5203 *
5204 * Construct a netlink attribute containing the register number. For
5205 * compatibility reasons, register numbers being a multiple of 4 are
5206 * translated to the corresponding 128 bit register numbers.
5207 */
b1c96ed3
PM		 5208int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5209{
49499c3e
PM		 5210 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5211 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5212 else
5213 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5214
b1c96ed3
PM		 5215 return nla_put_be32(skb, attr, htonl(reg));
5216}
5217EXPORT_SYMBOL_GPL(nft_dump_register);
5218
96518518 5219/**
d07db988 5220 * nft_validate_register_load - validate a load from a register
96518518
PM		 5221 *
5222 * @reg: the register number
d07db988 5223 * @len: the length of the data
96518518
PM		 5224 *
5225 * Validate that the input register is one of the general purpose
d07db988 5226 * registers and that the length of the load is within the bounds.
96518518 5227 */
d07db988 5228int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5229{
49499c3e 5230 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5231 return -EINVAL;
d07db988
PM		 5232 if (len == 0)
5233 return -EINVAL;
49499c3e 5234 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5235 return -ERANGE;
49499c3e 5236
96518518
PM		 5237 return 0;
5238}
d07db988 5239EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5240
96518518 5241/**
1ec10212 5242 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5243 *
5244 * @ctx: context of the expression performing the load
5245 * @reg: the destination register number
5246 * @data: the data to load
5247 * @type: the data type
45d9bcda 5248 * @len: the length of the data
96518518
PM		 5249 *
5250 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5251 * the destination register and the length is within the bounds.
5252 * A value of NULL for the data means that its runtime gathered
58f40ab6 5253 * data.
96518518 5254 */
1ec10212
PM		 5255int nft_validate_register_store(const struct nft_ctx *ctx,
5256 enum nft_registers reg,
5257 const struct nft_data *data,
5258 enum nft_data_types type, unsigned int len)
96518518 5259{
20a69341
PM		 5260 int err;
5261
96518518
PM		 5262 switch (reg) {
5263 case NFT_REG_VERDICT:
58f40ab6 5264 if (type != NFT_DATA_VERDICT)
96518518 5265 return -EINVAL;
20a69341 5266
58f40ab6 5267 if (data != NULL &&
1ca2e170
PM		 5268 (data->verdict.code == NFT_GOTO ||
5269 data->verdict.code == NFT_JUMP)) {
5270 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5271 if (err < 0)
5272 return err;
5273
1ca2e170
PM		 5274 if (ctx->chain->level + 1 >
5275 data->verdict.chain->level) {
20a69341
PM		 5276 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5277 return -EMLINK;
1ca2e170 5278 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5279 }
5280 }
5281
96518518
PM		 5282 return 0;
5283 default:
49499c3e 5284 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5285 return -EINVAL;
45d9bcda
PM		 5286 if (len == 0)
5287 return -EINVAL;
49499c3e
PM		 5288 if (reg * NFT_REG32_SIZE + len >
5289 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5290 return -ERANGE;
27e6d201 5291
96518518
PM		 5292 if (data != NULL && type != NFT_DATA_VALUE)
5293 return -EINVAL;
5294 return 0;
5295 }
5296}
1ec10212 5297EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5298
5299static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5300 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5301 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5302 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5303};
5304
5305static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5306 struct nft_data_desc *desc, const struct nlattr *nla)
5307{
664b0f8c 5308 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5309 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5310 struct nft_chain *chain;
5311 int err;
5312
5313 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5314 if (err < 0)
5315 return err;
5316
5317 if (!tb[NFTA_VERDICT_CODE])
5318 return -EINVAL;
1ca2e170 5319 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5320
1ca2e170 5321 switch (data->verdict.code) {
e0abdadc 5322 default:
1ca2e170 5323 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5324 case NF_ACCEPT:
5325 case NF_DROP:
5326 case NF_QUEUE:
5327 break;
5328 default:
5329 return -EINVAL;
5330 }
5331 /* fall through */
96518518
PM		 5332 case NFT_CONTINUE:
5333 case NFT_BREAK:
5334 case NFT_RETURN:
96518518
PM		 5335 break;
5336 case NFT_JUMP:
5337 case NFT_GOTO:
5338 if (!tb[NFTA_VERDICT_CHAIN])
5339 return -EINVAL;
5340 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5341 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5342 if (IS_ERR(chain))
5343 return PTR_ERR(chain);
f323d954 5344 if (nft_is_base_chain(chain))
96518518
PM		 5345 return -EOPNOTSUPP;
5346
96518518 5347 chain->use++;
1ca2e170 5348 data->verdict.chain = chain;
96518518 5349 break;
96518518
PM		 5350 }
5351
4c4ed074 5352 desc->len = sizeof(data->verdict);
96518518
PM		 5353 desc->type = NFT_DATA_VERDICT;
5354 return 0;
5355}
5356
5357static void nft_verdict_uninit(const struct nft_data *data)
5358{
1ca2e170 5359 switch (data->verdict.code) {
96518518
PM		 5360 case NFT_JUMP:
5361 case NFT_GOTO:
1ca2e170 5362 data->verdict.chain->use--;
96518518
PM		 5363 break;
5364 }
5365}
5366
33d5a7b1 5367int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5368{
5369 struct nlattr *nest;
5370
33d5a7b1 5371 nest = nla_nest_start(skb, type);
96518518
PM		 5372 if (!nest)
5373 goto nla_put_failure;
5374
33d5a7b1 5375 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5376 goto nla_put_failure;
5377
33d5a7b1 5378 switch (v->code) {
96518518
PM		 5379 case NFT_JUMP:
5380 case NFT_GOTO:
1ca2e170 5381 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5382 v->chain->name))
96518518
PM		 5383 goto nla_put_failure;
5384 }
5385 nla_nest_end(skb, nest);
5386 return 0;
5387
5388nla_put_failure:
5389 return -1;
5390}
5391
d0a11fc3
PM		 5392static int nft_value_init(const struct nft_ctx *ctx,
5393 struct nft_data *data, unsigned int size,
96518518
PM		 5394 struct nft_data_desc *desc, const struct nlattr *nla)
5395{
5396 unsigned int len;
5397
5398 len = nla_len(nla);
5399 if (len == 0)
5400 return -EINVAL;
d0a11fc3 5401 if (len > size)
96518518
PM		 5402 return -EOVERFLOW;
5403
d0a11fc3 5404 nla_memcpy(data->data, nla, len);
96518518
PM		 5405 desc->type = NFT_DATA_VALUE;
5406 desc->len = len;
5407 return 0;
5408}
5409
5410static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5411 unsigned int len)
5412{
5413 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5414}
5415
5416static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5417 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5418 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5419};
5420
5421/**
5422 * nft_data_init - parse nf_tables data netlink attributes
5423 *
5424 * @ctx: context of the expression using the data
5425 * @data: destination struct nft_data
d0a11fc3 5426 * @size: maximum data length
96518518
PM		 5427 * @desc: data description
5428 * @nla: netlink attribute containing data
5429 *
5430 * Parse the netlink data attributes and initialize a struct nft_data.
5431 * The type and length of data are returned in the data description.
5432 *
5433 * The caller can indicate that it only wants to accept data of type
5434 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5435 */
d0a11fc3
PM		 5436int nft_data_init(const struct nft_ctx *ctx,
5437 struct nft_data *data, unsigned int size,
96518518
PM		 5438 struct nft_data_desc *desc, const struct nlattr *nla)
5439{
5440 struct nlattr *tb[NFTA_DATA_MAX + 1];
5441 int err;
5442
5443 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5444 if (err < 0)
5445 return err;
5446
5447 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5448 return nft_value_init(ctx, data, size, desc,
5449 tb[NFTA_DATA_VALUE]);
96518518
PM		 5450 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5451 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5452 return -EINVAL;
5453}
5454EXPORT_SYMBOL_GPL(nft_data_init);
5455
5456/**
5457 * nft_data_uninit - release a nft_data item
5458 *
5459 * @data: struct nft_data to release
5460 * @type: type of data
5461 *
5462 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5463 * all others need to be released by calling this function.
5464 */
5465void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5466{
960bd2c2 5467 if (type < NFT_DATA_VERDICT)
96518518 5468 return;
960bd2c2 5469 switch (type) {
96518518
PM		 5470 case NFT_DATA_VERDICT:
5471 return nft_verdict_uninit(data);
5472 default:
5473 WARN_ON(1);
5474 }
5475}
5476EXPORT_SYMBOL_GPL(nft_data_uninit);
5477
5478int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5479 enum nft_data_types type, unsigned int len)
5480{
5481 struct nlattr *nest;
5482 int err;
5483
5484 nest = nla_nest_start(skb, attr);
5485 if (nest == NULL)
5486 return -1;
5487
5488 switch (type) {
5489 case NFT_DATA_VALUE:
5490 err = nft_value_dump(skb, data, len);
5491 break;
5492 case NFT_DATA_VERDICT:
33d5a7b1 5493 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5494 break;
5495 default:
5496 err = -EINVAL;
5497 WARN_ON(1);
5498 }
5499
5500 nla_nest_end(skb, nest);
5501 return err;
5502}
5503EXPORT_SYMBOL_GPL(nft_data_dump);
5504
df05ef87 5505static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5506{
5507 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5508 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5509 net->nft.base_seq = 1;
99633ab2
PNA		 5510 return 0;
5511}
5512
5ebe0b0e
PNA		 5513int __nft_release_basechain(struct nft_ctx *ctx)
5514{
5515 struct nft_rule *rule, *nr;
5516
f323d954 5517 BUG_ON(!nft_is_base_chain(ctx->chain));
5ebe0b0e 5518
82bec71d 5519 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 5520 ctx->afi->nops);
5521 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5522 list_del(&rule->list);
5523 ctx->chain->use--;
5524 nf_tables_rule_destroy(ctx, rule);
5525 }
5526 list_del(&ctx->chain->list);
5527 ctx->table->use--;
5528 nf_tables_chain_destroy(ctx->chain);
5529
5530 return 0;
5531}
5532EXPORT_SYMBOL_GPL(__nft_release_basechain);
5533
df05ef87
PNA		 5534/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5535static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5536{
5537 struct nft_table *table, *nt;
5538 struct nft_chain *chain, *nc;
e5009240 5539 struct nft_object *obj, *ne;
df05ef87
PNA		 5540 struct nft_rule *rule, *nr;
5541 struct nft_set *set, *ns;
5542 struct nft_ctx ctx = {
5543 .net = net,
5544 .afi = afi,
5545 };
5546
5547 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5548 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 5549 nf_tables_unregister_hooks(net, table, chain,
5550 afi->nops);
df05ef87
PNA		 5551 /* No packets are walking on these chains anymore. */
5552 ctx.table = table;
5553 list_for_each_entry(chain, &table->chains, list) {
5554 ctx.chain = chain;
5555 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5556 list_del(&rule->list);
5557 chain->use--;
5558 nf_tables_rule_destroy(&ctx, rule);
5559 }
5560 }
5561 list_for_each_entry_safe(set, ns, &table->sets, list) {
5562 list_del(&set->list);
5563 table->use--;
5564 nft_set_destroy(set);
5565 }
e5009240
PNA		 5566 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5567 list_del(&obj->list);
5568 table->use--;
5569 nft_obj_destroy(obj);
5570 }
df05ef87
PNA		 5571 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5572 list_del(&chain->list);
5573 table->use--;
5574 nf_tables_chain_destroy(chain);
5575 }
5576 list_del(&table->list);
5577 nf_tables_table_destroy(&ctx);
5578 }
5579}
5580
99633ab2
PNA		 5581static struct pernet_operations nf_tables_net_ops = {
5582 .init = nf_tables_init_net,
5583};
5584
96518518
PM		 5585static int __init nf_tables_module_init(void)
5586{
5587 int err;
5588
5589 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5590 GFP_KERNEL);
5591 if (info == NULL) {
5592 err = -ENOMEM;
5593 goto err1;
5594 }
5595
5596 err = nf_tables_core_module_init();
5597 if (err < 0)
5598 goto err2;
5599
5600 err = nfnetlink_subsys_register(&nf_tables_subsys);
5601 if (err < 0)
5602 goto err3;
5603
5604 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5605 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5606err3:
5607 nf_tables_core_module_exit();
5608err2:
5609 kfree(info);
5610err1:
5611 return err;
5612}
5613
5614static void __exit nf_tables_module_exit(void)
5615{
99633ab2 5616 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5617 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5618 rcu_barrier();
96518518
PM		 5619 nf_tables_core_module_exit();
5620 kfree(info);
5621}
5622
5623module_init(nf_tables_module_init);
5624module_exit(nf_tables_module_exit);
5625
5626MODULE_LICENSE("GPL");
5627MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5628MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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