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Merge tag 'mlx5-updates-2017-04-30' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-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
fceb6435
JB		 1185 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1186 NULL);
0ca743a5 1187 if (err < 0)
ff3cd7b3 1188 return ERR_PTR(err);
0ca743a5
PNA		 1189
1190 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1191 return ERR_PTR(-EINVAL);
0ca743a5 1192
ce355e20 1193 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1194 if (newstats == NULL)
ff3cd7b3 1195 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1196
1197 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1198 * are not exposed to userspace.
1199 */
e8781f70 1200 preempt_disable();
0ca743a5
PNA		 1201 stats = this_cpu_ptr(newstats);
1202 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1203 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1204 preempt_enable();
0ca743a5 1205
ff3cd7b3
PNA		 1206 return newstats;
1207}
1208
1209static void nft_chain_stats_replace(struct nft_base_chain *chain,
1210 struct nft_stats __percpu *newstats)
1211{
b88825de
PNA		 1212 if (newstats == NULL)
1213 return;
1214
0ca743a5 1215 if (chain->stats) {
0ca743a5 1216 struct nft_stats __percpu *oldstats =
67a8fc27 1217 nft_dereference(chain->stats);
0ca743a5
PNA		 1218
1219 rcu_assign_pointer(chain->stats, newstats);
1220 synchronize_rcu();
1221 free_percpu(oldstats);
1222 } else
1223 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1224}
1225
91c7b38d
PNA		 1226static void nf_tables_chain_destroy(struct nft_chain *chain)
1227{
1228 BUG_ON(chain->use > 0);
1229
f323d954 1230 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1231 struct nft_base_chain *basechain = nft_base_chain(chain);
1232
1233 module_put(basechain->type->owner);
1234 free_percpu(basechain->stats);
1235 if (basechain->ops[0].dev != NULL)
1236 dev_put(basechain->ops[0].dev);
1237 kfree(basechain);
91c7b38d
PNA		 1238 } else {
1239 kfree(chain);
1240 }
1241}
1242
508f8ccd
PNA		 1243struct nft_chain_hook {
1244 u32 num;
1245 u32 priority;
1246 const struct nf_chain_type *type;
1247 struct net_device *dev;
1248};
1249
1250static int nft_chain_parse_hook(struct net *net,
1251 const struct nlattr * const nla[],
1252 struct nft_af_info *afi,
1253 struct nft_chain_hook *hook, bool create)
1254{
1255 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1256 const struct nf_chain_type *type;
1257 struct net_device *dev;
1258 int err;
1259
1260 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
fceb6435 1261 nft_hook_policy, NULL);
508f8ccd
PNA		 1262 if (err < 0)
1263 return err;
1264
1265 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1266 ha[NFTA_HOOK_PRIORITY] == NULL)
1267 return -EINVAL;
1268
1269 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1270 if (hook->num >= afi->nhooks)
1271 return -EINVAL;
1272
1273 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1274
1275 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1276 if (nla[NFTA_CHAIN_TYPE]) {
1277 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1278 create);
1279 if (IS_ERR(type))
1280 return PTR_ERR(type);
1281 }
1282 if (!(type->hook_mask & (1 << hook->num)))
1283 return -EOPNOTSUPP;
1284 if (!try_module_get(type->owner))
1285 return -ENOENT;
1286
1287 hook->type = type;
1288
1289 hook->dev = NULL;
1290 if (afi->flags & NFT_AF_NEEDS_DEV) {
1291 char ifname[IFNAMSIZ];
1292
1293 if (!ha[NFTA_HOOK_DEV]) {
1294 module_put(type->owner);
1295 return -EOPNOTSUPP;
1296 }
1297
1298 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1299 dev = dev_get_by_name(net, ifname);
1300 if (!dev) {
1301 module_put(type->owner);
1302 return -ENOENT;
1303 }
1304 hook->dev = dev;
1305 } else if (ha[NFTA_HOOK_DEV]) {
1306 module_put(type->owner);
1307 return -EOPNOTSUPP;
1308 }
1309
1310 return 0;
1311}
1312
1313static void nft_chain_release_hook(struct nft_chain_hook *hook)
1314{
1315 module_put(hook->type->owner);
1316 if (hook->dev != NULL)
1317 dev_put(hook->dev);
1318}
1319
633c9a84
PNA		 1320static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1321 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1322 const struct nlattr * const nla[])
1323{
1324 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1325 const struct nlattr * uninitialized_var(name);
7c95f6d8 1326 struct nft_af_info *afi;
96518518
PM		 1327 struct nft_table *table;
1328 struct nft_chain *chain;
0ca743a5 1329 struct nft_base_chain *basechain = NULL;
f2a6d766 1330 u8 genmask = nft_genmask_next(net);
96518518 1331 int family = nfmsg->nfgen_family;
57de2a0c 1332 u8 policy = NF_ACCEPT;
96518518 1333 u64 handle = 0;
115a60b1 1334 unsigned int i;
ff3cd7b3 1335 struct nft_stats __percpu *stats;
96518518
PM		 1336 int err;
1337 bool create;
91c7b38d 1338 struct nft_ctx ctx;
96518518
PM		 1339
1340 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1341
99633ab2 1342 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1343 if (IS_ERR(afi))
1344 return PTR_ERR(afi);
1345
f2a6d766 1346 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1347 if (IS_ERR(table))
1348 return PTR_ERR(table);
1349
96518518
PM		 1350 chain = NULL;
1351 name = nla[NFTA_CHAIN_NAME];
1352
1353 if (nla[NFTA_CHAIN_HANDLE]) {
1354 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1355 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1356 if (IS_ERR(chain))
1357 return PTR_ERR(chain);
1358 } else {
664b0f8c 1359 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1360 if (IS_ERR(chain)) {
1361 if (PTR_ERR(chain) != -ENOENT)
1362 return PTR_ERR(chain);
1363 chain = NULL;
1364 }
1365 }
1366
57de2a0c 1367 if (nla[NFTA_CHAIN_POLICY]) {
f323d954
PNA		 1368 if (chain != NULL &&
1369 !nft_is_base_chain(chain))
d6b6cb1d
PNA		 1370 return -EOPNOTSUPP;
1371
1372 if (chain == NULL &&
57de2a0c
PM		 1373 nla[NFTA_CHAIN_HOOK] == NULL)
1374 return -EOPNOTSUPP;
1375
8f46df18 1376 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1377 switch (policy) {
1378 case NF_DROP:
1379 case NF_ACCEPT:
1380 break;
1381 default:
1382 return -EINVAL;
1383 }
1384 }
1385
96518518 1386 if (chain != NULL) {
91c7b38d
PNA		 1387 struct nft_stats *stats = NULL;
1388 struct nft_trans *trans;
1389
96518518
PM		 1390 if (nlh->nlmsg_flags & NLM_F_EXCL)
1391 return -EEXIST;
1392 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1393 return -EOPNOTSUPP;
1394
6133740d
PNA		 1395 if (nla[NFTA_CHAIN_HOOK]) {
1396 struct nft_base_chain *basechain;
1397 struct nft_chain_hook hook;
1398 struct nf_hook_ops *ops;
1399
f323d954 1400 if (!nft_is_base_chain(chain))
6133740d
PNA		 1401 return -EBUSY;
1402
1403 err = nft_chain_parse_hook(net, nla, afi, &hook,
1404 create);
1405 if (err < 0)
1406 return err;
1407
1408 basechain = nft_base_chain(chain);
1409 if (basechain->type != hook.type) {
1410 nft_chain_release_hook(&hook);
1411 return -EBUSY;
1412 }
1413
1414 for (i = 0; i < afi->nops; i++) {
1415 ops = &basechain->ops[i];
1416 if (ops->hooknum != hook.num ||
1417 ops->priority != hook.priority ||
1418 ops->dev != hook.dev) {
1419 nft_chain_release_hook(&hook);
1420 return -EBUSY;
1421 }
1422 }
1423 nft_chain_release_hook(&hook);
1424 }
1425
664b0f8c
PNA		 1426 if (nla[NFTA_CHAIN_HANDLE] && name) {
1427 struct nft_chain *chain2;
1428
1429 chain2 = nf_tables_chain_lookup(table,
1430 nla[NFTA_CHAIN_NAME],
1431 genmask);
1432 if (IS_ERR(chain2))
1433 return PTR_ERR(chain2);
1434 }
96518518 1435
0ca743a5 1436 if (nla[NFTA_CHAIN_COUNTERS]) {
f323d954 1437 if (!nft_is_base_chain(chain))
0ca743a5
PNA		 1438 return -EOPNOTSUPP;
1439
ff3cd7b3
PNA		 1440 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1441 if (IS_ERR(stats))
1442 return PTR_ERR(stats);
0ca743a5
PNA		 1443 }
1444
633c9a84 1445 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1446 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1447 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1448 if (trans == NULL) {
1449 free_percpu(stats);
91c7b38d 1450 return -ENOMEM;
f5553c19 1451 }
4401a862 1452
91c7b38d
PNA		 1453 nft_trans_chain_stats(trans) = stats;
1454 nft_trans_chain_update(trans) = true;
4401a862 1455
91c7b38d
PNA		 1456 if (nla[NFTA_CHAIN_POLICY])
1457 nft_trans_chain_policy(trans) = policy;
1458 else
1459 nft_trans_chain_policy(trans) = -1;
96518518 1460
91c7b38d
PNA		 1461 if (nla[NFTA_CHAIN_HANDLE] && name) {
1462 nla_strlcpy(nft_trans_chain_name(trans), name,
1463 NFT_CHAIN_MAXNAMELEN);
1464 }
1465 list_add_tail(&trans->list, &net->nft.commit_list);
1466 return 0;
96518518
PM		 1467 }
1468
75820676
PM		 1469 if (table->use == UINT_MAX)
1470 return -EOVERFLOW;
1471
96518518 1472 if (nla[NFTA_CHAIN_HOOK]) {
508f8ccd 1473 struct nft_chain_hook hook;
96518518 1474 struct nf_hook_ops *ops;
9370761c 1475 nf_hookfn *hookfn;
96518518 1476
508f8ccd 1477 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
96518518
PM		 1478 if (err < 0)
1479 return err;
2cbce139 1480
96518518 1481 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19 1482 if (basechain == NULL) {
508f8ccd 1483 nft_chain_release_hook(&hook);
96518518 1484 return -ENOMEM;
f5553c19 1485 }
9370761c 1486
508f8ccd
PNA		 1487 if (hook.dev != NULL)
1488 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
2cbce139 1489
4401a862 1490 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1491 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1492 if (IS_ERR(stats)) {
508f8ccd 1493 nft_chain_release_hook(&hook);
4401a862 1494 kfree(basechain);
ff3cd7b3 1495 return PTR_ERR(stats);
4401a862 1496 }
ff3cd7b3 1497 basechain->stats = stats;
4401a862 1498 } else {
ce355e20 1499 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1500 if (stats == NULL) {
508f8ccd 1501 nft_chain_release_hook(&hook);
4401a862 1502 kfree(basechain);
c123bb71 1503 return -ENOMEM;
4401a862 1504 }
ff3cd7b3 1505 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1506 }
1507
508f8ccd
PNA		 1508 hookfn = hook.type->hooks[hook.num];
1509 basechain->type = hook.type;
96518518
PM		 1510 chain = &basechain->chain;
1511
115a60b1
PM		 1512 for (i = 0; i < afi->nops; i++) {
1513 ops = &basechain->ops[i];
1514 ops->pf = family;
508f8ccd
PNA		 1515 ops->hooknum = hook.num;
1516 ops->priority = hook.priority;
115a60b1
PM		 1517 ops->priv = chain;
1518 ops->hook = afi->hooks[ops->hooknum];
508f8ccd 1519 ops->dev = hook.dev;
115a60b1
PM		 1520 if (hookfn)
1521 ops->hook = hookfn;
1522 if (afi->hook_ops_init)
1523 afi->hook_ops_init(ops, i);
1524 }
96518518
PM		 1525
1526 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1527 basechain->policy = policy;
96518518
PM		 1528 } else {
1529 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1530 if (chain == NULL)
1531 return -ENOMEM;
1532 }
1533
1534 INIT_LIST_HEAD(&chain->rules);
1535 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1536 chain->table = table;
96518518
PM		 1537 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1538
82bec71d 1539 err = nf_tables_register_hooks(net, table, chain, afi->nops);
d8ee8f7c
PNA		 1540 if (err < 0)
1541 goto err1;
96518518 1542
633c9a84 1543 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1544 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1545 if (err < 0)
1546 goto err2;
96518518 1547
4fefee57 1548 table->use++;
e688a7f8 1549 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1550 return 0;
1551err2:
82bec71d 1552 nf_tables_unregister_hooks(net, table, chain, afi->nops);
91c7b38d
PNA		 1553err1:
1554 nf_tables_chain_destroy(chain);
1555 return err;
96518518
PM		 1556}
1557
633c9a84
PNA		 1558static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1559 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1560 const struct nlattr * const nla[])
1561{
1562 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1563 u8 genmask = nft_genmask_next(net);
7c95f6d8 1564 struct nft_af_info *afi;
96518518
PM		 1565 struct nft_table *table;
1566 struct nft_chain *chain;
1567 int family = nfmsg->nfgen_family;
91c7b38d 1568 struct nft_ctx ctx;
96518518 1569
99633ab2 1570 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1571 if (IS_ERR(afi))
1572 return PTR_ERR(afi);
1573
f2a6d766 1574 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1575 if (IS_ERR(table))
1576 return PTR_ERR(table);
1577
664b0f8c 1578 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1579 if (IS_ERR(chain))
1580 return PTR_ERR(chain);
4fefee57 1581 if (chain->use > 0)
96518518
PM		 1582 return -EBUSY;
1583
633c9a84 1584 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1585
ee01d542 1586 return nft_delchain(&ctx);
96518518
PM		 1587}
1588
96518518
PM		 1589/*
1590 * Expressions
1591 */
1592
1593/**
ef1f7df9
PM		 1594 * nft_register_expr - register nf_tables expr type
1595 * @ops: expr type
96518518 1596 *
ef1f7df9 1597 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1598 * success or a negative errno code otherwise.
1599 */
ef1f7df9 1600int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1601{
1602 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1603 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1604 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1605 else
e688a7f8 1606 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1607 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1608 return 0;
1609}
1610EXPORT_SYMBOL_GPL(nft_register_expr);
1611
1612/**
ef1f7df9
PM		 1613 * nft_unregister_expr - unregister nf_tables expr type
1614 * @ops: expr type
96518518 1615 *
ef1f7df9 1616 * Unregisters the expr typefor use with nf_tables.
96518518 1617 */
ef1f7df9 1618void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1619{
1620 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1621 list_del_rcu(&type->list);
96518518
PM		 1622 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1623}
1624EXPORT_SYMBOL_GPL(nft_unregister_expr);
1625
64d46806
PM		 1626static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1627 struct nlattr *nla)
96518518 1628{
ef1f7df9 1629 const struct nft_expr_type *type;
96518518 1630
ef1f7df9 1631 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1632 if (!nla_strcmp(nla, type->name) &&
1633 (!type->family || type->family == family))
ef1f7df9 1634 return type;
96518518
PM		 1635 }
1636 return NULL;
1637}
1638
64d46806
PM		 1639static const struct nft_expr_type *nft_expr_type_get(u8 family,
1640 struct nlattr *nla)
96518518 1641{
ef1f7df9 1642 const struct nft_expr_type *type;
96518518
PM		 1643
1644 if (nla == NULL)
1645 return ERR_PTR(-EINVAL);
1646
64d46806 1647 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1648 if (type != NULL && try_module_get(type->owner))
1649 return type;
96518518
PM		 1650
1651#ifdef CONFIG_MODULES
ef1f7df9 1652 if (type == NULL) {
64d46806
PM		 1653 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1654 request_module("nft-expr-%u-%.*s", family,
1655 nla_len(nla), (char *)nla_data(nla));
1656 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1657 if (__nft_expr_type_get(family, nla))
1658 return ERR_PTR(-EAGAIN);
1659
96518518
PM		 1660 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1661 request_module("nft-expr-%.*s",
1662 nla_len(nla), (char *)nla_data(nla));
1663 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1664 if (__nft_expr_type_get(family, nla))
96518518
PM		 1665 return ERR_PTR(-EAGAIN);
1666 }
1667#endif
1668 return ERR_PTR(-ENOENT);
1669}
1670
1671static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1672 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1673 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1674};
1675
1676static int nf_tables_fill_expr_info(struct sk_buff *skb,
1677 const struct nft_expr *expr)
1678{
ef1f7df9 1679 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1680 goto nla_put_failure;
1681
1682 if (expr->ops->dump) {
1683 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1684 if (data == NULL)
1685 goto nla_put_failure;
1686 if (expr->ops->dump(skb, expr) < 0)
1687 goto nla_put_failure;
1688 nla_nest_end(skb, data);
1689 }
1690
1691 return skb->len;
1692
1693nla_put_failure:
1694 return -1;
1695};
1696
0b2d8a7b
PM		 1697int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1698 const struct nft_expr *expr)
1699{
1700 struct nlattr *nest;
1701
1702 nest = nla_nest_start(skb, attr);
1703 if (!nest)
1704 goto nla_put_failure;
1705 if (nf_tables_fill_expr_info(skb, expr) < 0)
1706 goto nla_put_failure;
1707 nla_nest_end(skb, nest);
1708 return 0;
1709
1710nla_put_failure:
1711 return -1;
1712}
1713
96518518
PM		 1714struct nft_expr_info {
1715 const struct nft_expr_ops *ops;
ef1f7df9 1716 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1717};
1718
0ca743a5
PNA		 1719static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1720 const struct nlattr *nla,
96518518
PM		 1721 struct nft_expr_info *info)
1722{
ef1f7df9 1723 const struct nft_expr_type *type;
96518518 1724 const struct nft_expr_ops *ops;
ef1f7df9 1725 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1726 int err;
1727
fceb6435 1728 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
96518518
PM		 1729 if (err < 0)
1730 return err;
1731
64d46806 1732 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1733 if (IS_ERR(type))
1734 return PTR_ERR(type);
1735
1736 if (tb[NFTA_EXPR_DATA]) {
1737 err = nla_parse_nested(info->tb, type->maxattr,
fceb6435 1738 tb[NFTA_EXPR_DATA], type->policy, NULL);
ef1f7df9
PM		 1739 if (err < 0)
1740 goto err1;
1741 } else
1742 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1743
1744 if (type->select_ops != NULL) {
0ca743a5
PNA		 1745 ops = type->select_ops(ctx,
1746 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1747 if (IS_ERR(ops)) {
1748 err = PTR_ERR(ops);
1749 goto err1;
1750 }
1751 } else
1752 ops = type->ops;
1753
96518518
PM		 1754 info->ops = ops;
1755 return 0;
ef1f7df9
PM		 1756
1757err1:
1758 module_put(type->owner);
1759 return err;
96518518
PM		 1760}
1761
1762static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1763 const struct nft_expr_info *info,
96518518
PM		 1764 struct nft_expr *expr)
1765{
1766 const struct nft_expr_ops *ops = info->ops;
1767 int err;
1768
1769 expr->ops = ops;
1770 if (ops->init) {
ef1f7df9 1771 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1772 if (err < 0)
1773 goto err1;
1774 }
1775
c56e3956
LZ		 1776 if (ops->validate) {
1777 const struct nft_data *data = NULL;
1778
1779 err = ops->validate(ctx, expr, &data);
1780 if (err < 0)
1781 goto err2;
1782 }
1783
96518518
PM		 1784 return 0;
1785
c56e3956
LZ		 1786err2:
1787 if (ops->destroy)
1788 ops->destroy(ctx, expr);
96518518
PM		 1789err1:
1790 expr->ops = NULL;
1791 return err;
1792}
1793
62472bce
PM		 1794static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1795 struct nft_expr *expr)
96518518
PM		 1796{
1797 if (expr->ops->destroy)
62472bce 1798 expr->ops->destroy(ctx, expr);
ef1f7df9 1799 module_put(expr->ops->type->owner);
96518518
PM		 1800}
1801
0b2d8a7b
PM		 1802struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1803 const struct nlattr *nla)
1804{
1805 struct nft_expr_info info;
1806 struct nft_expr *expr;
1807 int err;
1808
1809 err = nf_tables_expr_parse(ctx, nla, &info);
1810 if (err < 0)
1811 goto err1;
1812
1813 err = -ENOMEM;
1814 expr = kzalloc(info.ops->size, GFP_KERNEL);
1815 if (expr == NULL)
1816 goto err2;
1817
1818 err = nf_tables_newexpr(ctx, &info, expr);
1819 if (err < 0)
6cafaf47 1820 goto err3;
0b2d8a7b
PM		 1821
1822 return expr;
6cafaf47
LZ		 1823err3:
1824 kfree(expr);
0b2d8a7b
PM		 1825err2:
1826 module_put(info.ops->type->owner);
1827err1:
1828 return ERR_PTR(err);
1829}
1830
1831void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1832{
1833 nf_tables_expr_destroy(ctx, expr);
1834 kfree(expr);
1835}
1836
96518518
PM		 1837/*
1838 * Rules
1839 */
1840
1841static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1842 u64 handle)
1843{
1844 struct nft_rule *rule;
1845
1846 // FIXME: this sucks
1847 list_for_each_entry(rule, &chain->rules, list) {
1848 if (handle == rule->handle)
1849 return rule;
1850 }
1851
1852 return ERR_PTR(-ENOENT);
1853}
1854
1855static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1856 const struct nlattr *nla)
1857{
1858 if (nla == NULL)
1859 return ERR_PTR(-EINVAL);
1860
1861 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1862}
1863
1864static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 1865 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1866 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1867 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1868 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1869 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1870 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1871 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1872 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1873 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1874 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1875};
1876
84d7fce6
PNA		 1877static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1878 u32 portid, u32 seq, int event,
1879 u32 flags, int family,
96518518
PM		 1880 const struct nft_table *table,
1881 const struct nft_chain *chain,
1882 const struct nft_rule *rule)
1883{
1884 struct nlmsghdr *nlh;
1885 struct nfgenmsg *nfmsg;
1886 const struct nft_expr *expr, *next;
1887 struct nlattr *list;
5e948466 1888 const struct nft_rule *prule;
dedb67c4 1889 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 1890
dedb67c4 1891 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 1892 if (nlh == NULL)
1893 goto nla_put_failure;
1894
1895 nfmsg = nlmsg_data(nlh);
1896 nfmsg->nfgen_family = family;
1897 nfmsg->version = NFNETLINK_V0;
84d7fce6 1898 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1899
1900 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1901 goto nla_put_failure;
1902 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1903 goto nla_put_failure;
b46f6ded
ND		 1904 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1905 NFTA_RULE_PAD))
96518518
PM		 1906 goto nla_put_failure;
1907
5e948466 1908 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 1909 prule = list_prev_entry(rule, list);
5e948466 1910 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1911 cpu_to_be64(prule->handle),
1912 NFTA_RULE_PAD))
5e948466
EL		 1913 goto nla_put_failure;
1914 }
1915
96518518
PM		 1916 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1917 if (list == NULL)
1918 goto nla_put_failure;
1919 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1920 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1921 goto nla_put_failure;
96518518
PM		 1922 }
1923 nla_nest_end(skb, list);
1924
86f1ec32
PM		 1925 if (rule->udata) {
1926 struct nft_userdata *udata = nft_userdata(rule);
1927 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1928 udata->data) < 0)
1929 goto nla_put_failure;
1930 }
0768b3b3 1931
053c095a
JB		 1932 nlmsg_end(skb, nlh);
1933 return 0;
96518518
PM		 1934
1935nla_put_failure:
1936 nlmsg_trim(skb, nlh);
1937 return -1;
1938}
1939
25e94a99
PNA		 1940static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1941 const struct nft_rule *rule, int event)
96518518
PM		 1942{
1943 struct sk_buff *skb;
96518518
PM		 1944 int err;
1945
128ad332
PNA		 1946 if (!ctx->report &&
1947 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1948 return;
96518518 1949
96518518
PM		 1950 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1951 if (skb == NULL)
1952 goto err;
1953
84d7fce6
PNA		 1954 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1955 event, 0, ctx->afi->family, ctx->table,
35151d84 1956 ctx->chain, rule);
96518518
PM		 1957 if (err < 0) {
1958 kfree_skb(skb);
1959 goto err;
1960 }
1961
25e94a99
PNA		 1962 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1963 ctx->report, GFP_KERNEL);
1964 return;
96518518 1965err:
25e94a99 1966 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1967}
1968
6e1f760e
PNA		 1969struct nft_rule_dump_ctx {
1970 char table[NFT_TABLE_MAXNAMELEN];
1971 char chain[NFT_CHAIN_MAXNAMELEN];
1972};
1973
96518518
PM		 1974static int nf_tables_dump_rules(struct sk_buff *skb,
1975 struct netlink_callback *cb)
1976{
1977 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 1978 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 1979 const struct nft_af_info *afi;
1980 const struct nft_table *table;
1981 const struct nft_chain *chain;
1982 const struct nft_rule *rule;
1983 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1984 struct net *net = sock_net(skb->sk);
96518518
PM		 1985 int family = nfmsg->nfgen_family;
1986
e688a7f8 1987 rcu_read_lock();
38e029f1
PNA		 1988 cb->seq = net->nft.base_seq;
1989
e688a7f8 1990 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1991 if (family != NFPROTO_UNSPEC && family != afi->family)
1992 continue;
1993
e688a7f8 1994 list_for_each_entry_rcu(table, &afi->tables, list) {
6e1f760e
PNA		 1995 if (ctx && ctx->table[0] &&
1996 strcmp(ctx->table, table->name) != 0)
1997 continue;
1998
e688a7f8 1999 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 2000 if (ctx && ctx->chain[0] &&
2001 strcmp(ctx->chain, chain->name) != 0)
2002 continue;
2003
e688a7f8 2004 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2005 if (!nft_is_active(net, rule))
0628b123 2006 goto cont;
96518518
PM		 2007 if (idx < s_idx)
2008 goto cont;
2009 if (idx > s_idx)
2010 memset(&cb->args[1], 0,
2011 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2012 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2013 cb->nlh->nlmsg_seq,
2014 NFT_MSG_NEWRULE,
2015 NLM_F_MULTI | NLM_F_APPEND,
2016 afi->family, table, chain, rule) < 0)
2017 goto done;
38e029f1
PNA		 2018
2019 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2020cont:
2021 idx++;
2022 }
2023 }
2024 }
2025 }
2026done:
e688a7f8
PNA		 2027 rcu_read_unlock();
2028
96518518
PM		 2029 cb->args[0] = idx;
2030 return skb->len;
2031}
2032
6e1f760e
PNA		 2033static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2034{
2035 kfree(cb->data);
2036 return 0;
2037}
2038
7b8002a1
PNA		 2039static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2040 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2041 const struct nlattr * const nla[])
2042{
2043 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2044 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2045 const struct nft_af_info *afi;
2046 const struct nft_table *table;
2047 const struct nft_chain *chain;
2048 const struct nft_rule *rule;
2049 struct sk_buff *skb2;
2050 int family = nfmsg->nfgen_family;
2051 int err;
2052
2053 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2054 struct netlink_dump_control c = {
2055 .dump = nf_tables_dump_rules,
6e1f760e 2056 .done = nf_tables_dump_rules_done,
96518518 2057 };
6e1f760e
PNA		 2058
2059 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2060 struct nft_rule_dump_ctx *ctx;
2061
2062 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2063 if (!ctx)
2064 return -ENOMEM;
2065
2066 if (nla[NFTA_RULE_TABLE])
2067 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2068 sizeof(ctx->table));
2069 if (nla[NFTA_RULE_CHAIN])
2070 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2071 sizeof(ctx->chain));
2072 c.data = ctx;
2073 }
2074
96518518
PM		 2075 return netlink_dump_start(nlsk, skb, nlh, &c);
2076 }
2077
99633ab2 2078 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2079 if (IS_ERR(afi))
2080 return PTR_ERR(afi);
2081
f2a6d766 2082 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2083 if (IS_ERR(table))
2084 return PTR_ERR(table);
2085
664b0f8c 2086 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2087 if (IS_ERR(chain))
2088 return PTR_ERR(chain);
2089
2090 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2091 if (IS_ERR(rule))
2092 return PTR_ERR(rule);
2093
2094 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2095 if (!skb2)
2096 return -ENOMEM;
2097
84d7fce6 2098 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2099 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2100 family, table, chain, rule);
2101 if (err < 0)
2102 goto err;
2103
2104 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2105
2106err:
2107 kfree_skb(skb2);
2108 return err;
2109}
2110
62472bce
PM		 2111static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2112 struct nft_rule *rule)
96518518 2113{
96518518
PM		 2114 struct nft_expr *expr;
2115
2116 /*
2117 * Careful: some expressions might not be initialized in case this
2118 * is called on error from nf_tables_newrule().
2119 */
2120 expr = nft_expr_first(rule);
3e38df13 2121 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2122 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2123 expr = nft_expr_next(expr);
2124 }
2125 kfree(rule);
2126}
2127
1081d11b
PNA		 2128#define NFT_RULE_MAXEXPRS 128
2129
2130static struct nft_expr_info *info;
2131
633c9a84
PNA		 2132static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2133 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2134 const struct nlattr * const nla[])
2135{
2136 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2137 u8 genmask = nft_genmask_next(net);
7c95f6d8 2138 struct nft_af_info *afi;
96518518
PM		 2139 struct nft_table *table;
2140 struct nft_chain *chain;
2141 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2142 struct nft_userdata *udata;
1081d11b 2143 struct nft_trans *trans = NULL;
96518518
PM		 2144 struct nft_expr *expr;
2145 struct nft_ctx ctx;
2146 struct nlattr *tmp;
86f1ec32 2147 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2148 int err, rem;
2149 bool create;
5e948466 2150 u64 handle, pos_handle;
96518518
PM		 2151
2152 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2153
99633ab2 2154 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2155 if (IS_ERR(afi))
2156 return PTR_ERR(afi);
2157
f2a6d766 2158 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2159 if (IS_ERR(table))
2160 return PTR_ERR(table);
2161
664b0f8c 2162 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2163 if (IS_ERR(chain))
2164 return PTR_ERR(chain);
2165
2166 if (nla[NFTA_RULE_HANDLE]) {
2167 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2168 rule = __nf_tables_rule_lookup(chain, handle);
2169 if (IS_ERR(rule))
2170 return PTR_ERR(rule);
2171
2172 if (nlh->nlmsg_flags & NLM_F_EXCL)
2173 return -EEXIST;
2174 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2175 old_rule = rule;
2176 else
2177 return -EOPNOTSUPP;
2178 } else {
2179 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2180 return -EINVAL;
2181 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2182
2183 if (chain->use == UINT_MAX)
2184 return -EOVERFLOW;
96518518
PM		 2185 }
2186
5e948466
EL		 2187 if (nla[NFTA_RULE_POSITION]) {
2188 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2189 return -EOPNOTSUPP;
2190
2191 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2192 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2193 if (IS_ERR(old_rule))
2194 return PTR_ERR(old_rule);
2195 }
2196
633c9a84 2197 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2198
96518518
PM		 2199 n = 0;
2200 size = 0;
2201 if (nla[NFTA_RULE_EXPRESSIONS]) {
2202 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2203 err = -EINVAL;
2204 if (nla_type(tmp) != NFTA_LIST_ELEM)
2205 goto err1;
2206 if (n == NFT_RULE_MAXEXPRS)
2207 goto err1;
0ca743a5 2208 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2209 if (err < 0)
2210 goto err1;
2211 size += info[n].ops->size;
2212 n++;
2213 }
2214 }
9889840f
PM		 2215 /* Check for overflow of dlen field */
2216 err = -EFBIG;
2217 if (size >= 1 << 12)
2218 goto err1;
96518518 2219
86f1ec32 2220 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2221 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2222 if (ulen > 0)
2223 usize = sizeof(struct nft_userdata) + ulen;
2224 }
0768b3b3 2225
96518518 2226 err = -ENOMEM;
86f1ec32 2227 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2228 if (rule == NULL)
2229 goto err1;
2230
889f7ee7 2231 nft_activate_next(net, rule);
0628b123 2232
96518518
PM		 2233 rule->handle = handle;
2234 rule->dlen = size;
86f1ec32 2235 rule->udata = ulen ? 1 : 0;
0768b3b3 2236
86f1ec32
PM		 2237 if (ulen) {
2238 udata = nft_userdata(rule);
2239 udata->len = ulen - 1;
2240 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2241 }
96518518 2242
96518518
PM		 2243 expr = nft_expr_first(rule);
2244 for (i = 0; i < n; i++) {
2245 err = nf_tables_newexpr(&ctx, &info[i], expr);
2246 if (err < 0)
2247 goto err2;
ef1f7df9 2248 info[i].ops = NULL;
96518518
PM		 2249 expr = nft_expr_next(expr);
2250 }
2251
96518518 2252 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2253 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2254 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2255 old_rule);
1081d11b 2256 if (trans == NULL) {
0628b123
PNA		 2257 err = -ENOMEM;
2258 goto err2;
2259 }
889f7ee7 2260 nft_deactivate_next(net, old_rule);
ac34b861 2261 chain->use--;
5bc5c307 2262 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2263 } else {
2264 err = -ENOENT;
2265 goto err2;
2266 }
96518518 2267 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2268 if (old_rule)
2269 list_add_rcu(&rule->list, &old_rule->list);
2270 else
2271 list_add_tail_rcu(&rule->list, &chain->rules);
2272 else {
2273 if (old_rule)
2274 list_add_tail_rcu(&rule->list, &old_rule->list);
2275 else
2276 list_add_rcu(&rule->list, &chain->rules);
2277 }
96518518 2278
b380e5c7 2279 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2280 err = -ENOMEM;
2281 goto err3;
2282 }
4fefee57 2283 chain->use++;
96518518
PM		 2284 return 0;
2285
0628b123
PNA		 2286err3:
2287 list_del_rcu(&rule->list);
96518518 2288err2:
62472bce 2289 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2290err1:
2291 for (i = 0; i < n; i++) {
2292 if (info[i].ops != NULL)
ef1f7df9 2293 module_put(info[i].ops->type->owner);
96518518
PM		 2294 }
2295 return err;
2296}
2297
1a94e38d
PNA		 2298static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2299 const struct nlattr *nla)
2300{
2301 u32 id = ntohl(nla_get_be32(nla));
2302 struct nft_trans *trans;
2303
2304 list_for_each_entry(trans, &net->nft.commit_list, list) {
2305 struct nft_rule *rule = nft_trans_rule(trans);
2306
2307 if (trans->msg_type == NFT_MSG_NEWRULE &&
2308 id == nft_trans_rule_id(trans))
2309 return rule;
2310 }
2311 return ERR_PTR(-ENOENT);
2312}
2313
633c9a84
PNA		 2314static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2315 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2316 const struct nlattr * const nla[])
2317{
2318 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2319 u8 genmask = nft_genmask_next(net);
7c95f6d8 2320 struct nft_af_info *afi;
7c95f6d8 2321 struct nft_table *table;
cf9dc09d
PNA		 2322 struct nft_chain *chain = NULL;
2323 struct nft_rule *rule;
0628b123
PNA		 2324 int family = nfmsg->nfgen_family, err = 0;
2325 struct nft_ctx ctx;
96518518 2326
99633ab2 2327 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2328 if (IS_ERR(afi))
2329 return PTR_ERR(afi);
2330
f2a6d766 2331 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2332 if (IS_ERR(table))
2333 return PTR_ERR(table);
2334
cf9dc09d 2335 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2336 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2337 genmask);
cf9dc09d
PNA		 2338 if (IS_ERR(chain))
2339 return PTR_ERR(chain);
2340 }
96518518 2341
633c9a84 2342 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2343
cf9dc09d
PNA		 2344 if (chain) {
2345 if (nla[NFTA_RULE_HANDLE]) {
2346 rule = nf_tables_rule_lookup(chain,
2347 nla[NFTA_RULE_HANDLE]);
2348 if (IS_ERR(rule))
2349 return PTR_ERR(rule);
96518518 2350
1a94e38d
PNA		 2351 err = nft_delrule(&ctx, rule);
2352 } else if (nla[NFTA_RULE_ID]) {
2353 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2354 if (IS_ERR(rule))
2355 return PTR_ERR(rule);
2356
5e266fe7 2357 err = nft_delrule(&ctx, rule);
cf9dc09d 2358 } else {
ce24b721 2359 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2360 }
2361 } else {
2362 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2363 if (!nft_is_active_next(net, chain))
2364 continue;
2365
cf9dc09d 2366 ctx.chain = chain;
ce24b721 2367 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2368 if (err < 0)
2369 break;
2370 }
2371 }
2372
2373 return err;
2374}
2375
20a69341
PM		 2376/*
2377 * Sets
2378 */
2379
2380static LIST_HEAD(nf_tables_set_ops);
2381
2382int nft_register_set(struct nft_set_ops *ops)
2383{
2384 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2385 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2386 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2387 return 0;
2388}
2389EXPORT_SYMBOL_GPL(nft_register_set);
2390
2391void nft_unregister_set(struct nft_set_ops *ops)
2392{
2393 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2394 list_del_rcu(&ops->list);
20a69341
PM		 2395 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2396}
2397EXPORT_SYMBOL_GPL(nft_unregister_set);
2398
c50b960c
PM		 2399/*
2400 * Select a set implementation based on the data characteristics and the
2401 * given policy. The total memory use might not be known if no size is
2402 * given, in that case the amount of memory per element is used.
2403 */
2404static const struct nft_set_ops *
2405nft_select_set_ops(const struct nlattr * const nla[],
2406 const struct nft_set_desc *desc,
2407 enum nft_set_policies policy)
20a69341 2408{
c50b960c
PM		 2409 const struct nft_set_ops *ops, *bops;
2410 struct nft_set_estimate est, best;
20a69341
PM		 2411 u32 features;
2412
2413#ifdef CONFIG_MODULES
2414 if (list_empty(&nf_tables_set_ops)) {
2415 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2416 request_module("nft-set");
2417 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2418 if (!list_empty(&nf_tables_set_ops))
2419 return ERR_PTR(-EAGAIN);
2420 }
2421#endif
2422 features = 0;
2423 if (nla[NFTA_SET_FLAGS] != NULL) {
2424 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
7286ff7f
PNA		 2425 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2426 NFT_SET_OBJECT;
20a69341
PM		 2427 }
2428
55af753c
PNA		 2429 bops = NULL;
2430 best.size = ~0;
2431 best.lookup = ~0;
0b5a7874 2432 best.space = ~0;
c50b960c 2433
20a69341
PM		 2434 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2435 if ((ops->features & features) != features)
2436 continue;
c50b960c
PM		 2437 if (!ops->estimate(desc, features, &est))
2438 continue;
2439
2440 switch (policy) {
2441 case NFT_SET_POL_PERFORMANCE:
55af753c 2442 if (est.lookup < best.lookup)
c50b960c 2443 break;
0b5a7874
PNA		 2444 if (est.lookup == best.lookup) {
2445 if (!desc->size) {
2446 if (est.space < best.space)
2447 break;
2448 } else if (est.size < best.size) {
2449 break;
2450 }
2451 }
c50b960c
PM		 2452 continue;
2453 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2454 if (!desc->size) {
2455 if (est.space < best.space)
2456 break;
2457 if (est.space == best.space &&
2458 est.lookup < best.lookup)
2459 break;
2460 } else if (est.size < best.size) {
c50b960c 2461 break;
0b5a7874 2462 }
c50b960c
PM		 2463 continue;
2464 default:
2465 break;
2466 }
2467
20a69341
PM		 2468 if (!try_module_get(ops->owner))
2469 continue;
c50b960c
PM		 2470 if (bops != NULL)
2471 module_put(bops->owner);
2472
2473 bops = ops;
2474 best = est;
20a69341
PM		 2475 }
2476
c50b960c
PM		 2477 if (bops != NULL)
2478 return bops;
2479
20a69341
PM		 2480 return ERR_PTR(-EOPNOTSUPP);
2481}
2482
2483static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2484 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2485 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2486 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2487 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2488 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2489 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2490 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2491 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2492 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2493 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2494 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2495 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2496 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2497 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2498 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2499 .len = NFT_USERDATA_MAXLEN },
8aeff920 2500 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2501};
2502
2503static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2504 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2505};
2506
633c9a84 2507static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2508 const struct sk_buff *skb,
2509 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2510 const struct nlattr * const nla[],
2511 u8 genmask)
20a69341
PM		 2512{
2513 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2514 struct nft_af_info *afi = NULL;
2515 struct nft_table *table = NULL;
20a69341 2516
c9c8e485
PNA		 2517 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2518 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2519 if (IS_ERR(afi))
2520 return PTR_ERR(afi);
2521 }
20a69341
PM		 2522
2523 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2524 if (afi == NULL)
2525 return -EAFNOSUPPORT;
2526
f2a6d766
PNA		 2527 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2528 genmask);
20a69341
PM		 2529 if (IS_ERR(table))
2530 return PTR_ERR(table);
2531 }
2532
633c9a84 2533 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2534 return 0;
2535}
2536
c7a72e3f
PNA		 2537static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2538 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2539{
2540 struct nft_set *set;
2541
2542 if (nla == NULL)
2543 return ERR_PTR(-EINVAL);
2544
2545 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2546 if (!nla_strcmp(nla, set->name) &&
2547 nft_active_genmask(set, genmask))
20a69341
PM		 2548 return set;
2549 }
2550 return ERR_PTR(-ENOENT);
2551}
2552
c7a72e3f
PNA		 2553static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2554 const struct nlattr *nla,
2555 u8 genmask)
958bee14
PNA		 2556{
2557 struct nft_trans *trans;
2558 u32 id = ntohl(nla_get_be32(nla));
2559
2560 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2561 struct nft_set *set = nft_trans_set(trans);
2562
958bee14 2563 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2564 id == nft_trans_set_id(trans) &&
2565 nft_active_genmask(set, genmask))
2566 return set;
958bee14
PNA		 2567 }
2568 return ERR_PTR(-ENOENT);
2569}
c7a72e3f
PNA		 2570
2571struct nft_set *nft_set_lookup(const struct net *net,
2572 const struct nft_table *table,
2573 const struct nlattr *nla_set_name,
2574 const struct nlattr *nla_set_id,
2575 u8 genmask)
2576{
2577 struct nft_set *set;
2578
2579 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2580 if (IS_ERR(set)) {
2581 if (!nla_set_id)
2582 return set;
2583
2584 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2585 }
2586 return set;
2587}
2588EXPORT_SYMBOL_GPL(nft_set_lookup);
958bee14 2589
20a69341
PM		 2590static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2591 const char *name)
2592{
2593 const struct nft_set *i;
2594 const char *p;
2595 unsigned long *inuse;
60eb1894 2596 unsigned int n = 0, min = 0;
20a69341 2597
cb39ad8b 2598 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2599 if (p != NULL) {
2600 if (p[1] != 'd' || strchr(p + 2, '%'))
2601 return -EINVAL;
2602
2603 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2604 if (inuse == NULL)
2605 return -ENOMEM;
60eb1894 2606cont:
20a69341 2607 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2608 int tmp;
2609
37a9cc52
PNA		 2610 if (!nft_is_active_next(ctx->net, set))
2611 continue;
14662917 2612 if (!sscanf(i->name, name, &tmp))
20a69341 2613 continue;
60eb1894 2614 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2615 continue;
14662917 2616
60eb1894 2617 set_bit(tmp - min, inuse);
20a69341
PM		 2618 }
2619
53b70287 2620 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2621 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2622 min += BITS_PER_BYTE * PAGE_SIZE;
2623 memset(inuse, 0, PAGE_SIZE);
2624 goto cont;
2625 }
20a69341
PM		 2626 free_page((unsigned long)inuse);
2627 }
2628
60eb1894 2629 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341 2630 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2631 if (!nft_is_active_next(ctx->net, i))
2632 continue;
20a69341
PM		 2633 if (!strcmp(set->name, i->name))
2634 return -ENFILE;
2635 }
2636 return 0;
2637}
2638
2639static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2640 const struct nft_set *set, u16 event, u16 flags)
2641{
2642 struct nfgenmsg *nfmsg;
2643 struct nlmsghdr *nlh;
c50b960c 2644 struct nlattr *desc;
128ad332
PNA		 2645 u32 portid = ctx->portid;
2646 u32 seq = ctx->seq;
20a69341 2647
dedb67c4 2648 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 2649 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2650 flags);
2651 if (nlh == NULL)
2652 goto nla_put_failure;
2653
2654 nfmsg = nlmsg_data(nlh);
2655 nfmsg->nfgen_family = ctx->afi->family;
2656 nfmsg->version = NFNETLINK_V0;
84d7fce6 2657 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2658
2659 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2660 goto nla_put_failure;
2661 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2662 goto nla_put_failure;
2663 if (set->flags != 0)
2664 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2665 goto nla_put_failure;
2666
2667 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2668 goto nla_put_failure;
2669 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2670 goto nla_put_failure;
2671 if (set->flags & NFT_SET_MAP) {
2672 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2673 goto nla_put_failure;
2674 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2675 goto nla_put_failure;
2676 }
8aeff920
PNA		 2677 if (set->flags & NFT_SET_OBJECT &&
2678 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2679 goto nla_put_failure;
20a69341 2680
761da293 2681 if (set->timeout &&
d3e2a111
AP		 2682 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2683 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2684 NFTA_SET_PAD))
761da293
PM		 2685 goto nla_put_failure;
2686 if (set->gc_int &&
2687 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2688 goto nla_put_failure;
2689
9363dc4b
AB		 2690 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2691 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2692 goto nla_put_failure;
2693 }
2694
e6d8ecac
CFG		 2695 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2696 goto nla_put_failure;
2697
c50b960c
PM		 2698 desc = nla_nest_start(skb, NFTA_SET_DESC);
2699 if (desc == NULL)
2700 goto nla_put_failure;
2701 if (set->size &&
2702 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2703 goto nla_put_failure;
2704 nla_nest_end(skb, desc);
2705
053c095a
JB		 2706 nlmsg_end(skb, nlh);
2707 return 0;
20a69341
PM		 2708
2709nla_put_failure:
2710 nlmsg_trim(skb, nlh);
2711 return -1;
2712}
2713
25e94a99
PNA		 2714static void nf_tables_set_notify(const struct nft_ctx *ctx,
2715 const struct nft_set *set, int event,
2716 gfp_t gfp_flags)
20a69341
PM		 2717{
2718 struct sk_buff *skb;
128ad332 2719 u32 portid = ctx->portid;
20a69341
PM		 2720 int err;
2721
128ad332
PNA		 2722 if (!ctx->report &&
2723 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2724 return;
20a69341 2725
31f8441c 2726 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2727 if (skb == NULL)
2728 goto err;
2729
2730 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2731 if (err < 0) {
2732 kfree_skb(skb);
2733 goto err;
2734 }
2735
25e94a99
PNA		 2736 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2737 gfp_flags);
2738 return;
20a69341 2739err:
25e94a99 2740 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 2741}
2742
5b96af77 2743static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2744{
2745 const struct nft_set *set;
2746 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2747 struct nft_af_info *afi;
c9c8e485
PNA		 2748 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2749 struct net *net = sock_net(skb->sk);
2750 int cur_family = cb->args[3];
5b96af77 2751 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2752
2753 if (cb->args[1])
2754 return skb->len;
2755
e688a7f8 2756 rcu_read_lock();
38e029f1
PNA		 2757 cb->seq = net->nft.base_seq;
2758
e688a7f8 2759 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2760 if (ctx->afi && ctx->afi != afi)
2761 continue;
2762
c9c8e485
PNA		 2763 if (cur_family) {
2764 if (afi->family != cur_family)
2765 continue;
2766
2767 cur_family = 0;
2768 }
e688a7f8 2769 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2770 if (ctx->table && ctx->table != table)
2771 continue;
2772
c9c8e485
PNA		 2773 if (cur_table) {
2774 if (cur_table != table)
2775 continue;
2776
2777 cur_table = NULL;
2778 }
c9c8e485 2779 idx = 0;
5b96af77 2780 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2781 if (idx < s_idx)
2782 goto cont;
37a9cc52
PNA		 2783 if (!nft_is_active(net, set))
2784 goto cont;
5b96af77
PNA		 2785
2786 ctx_set = *ctx;
2787 ctx_set.table = table;
2788 ctx_set.afi = afi;
2789 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2790 NFT_MSG_NEWSET,
2791 NLM_F_MULTI) < 0) {
2792 cb->args[0] = idx;
2793 cb->args[2] = (unsigned long) table;
2794 cb->args[3] = afi->family;
2795 goto done;
2796 }
38e029f1 2797 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2798cont:
2799 idx++;
2800 }
2801 if (s_idx)
2802 s_idx = 0;
2803 }
2804 }
2805 cb->args[1] = 1;
2806done:
e688a7f8 2807 rcu_read_unlock();
c9c8e485
PNA		 2808 return skb->len;
2809}
2810
5b96af77 2811static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2812{
5b96af77
PNA		 2813 kfree(cb->data);
2814 return 0;
20a69341
PM		 2815}
2816
7b8002a1
PNA		 2817static int nf_tables_getset(struct net *net, struct sock *nlsk,
2818 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2819 const struct nlattr * const nla[])
2820{
f2a6d766 2821 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2822 const struct nft_set *set;
2823 struct nft_ctx ctx;
2824 struct sk_buff *skb2;
c9c8e485 2825 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2826 int err;
2827
01cfa0a4 2828 /* Verify existence before starting dump */
f2a6d766 2829 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2830 if (err < 0)
2831 return err;
2832
2833 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2834 struct netlink_dump_control c = {
2835 .dump = nf_tables_dump_sets,
5b96af77 2836 .done = nf_tables_dump_sets_done,
20a69341 2837 };
5b96af77
PNA		 2838 struct nft_ctx *ctx_dump;
2839
2840 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2841 if (ctx_dump == NULL)
2842 return -ENOMEM;
2843
2844 *ctx_dump = ctx;
2845 c.data = ctx_dump;
2846
20a69341
PM		 2847 return netlink_dump_start(nlsk, skb, nlh, &c);
2848 }
2849
c9c8e485
PNA		 2850 /* Only accept unspec with dump */
2851 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2852 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2853 if (!nla[NFTA_SET_TABLE])
2854 return -EINVAL;
c9c8e485 2855
37a9cc52 2856 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2857 if (IS_ERR(set))
2858 return PTR_ERR(set);
2859
2860 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2861 if (skb2 == NULL)
2862 return -ENOMEM;
2863
2864 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2865 if (err < 0)
2866 goto err;
2867
2868 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2869
2870err:
2871 kfree_skb(skb2);
2872 return err;
2873}
2874
c50b960c
PM		 2875static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2876 struct nft_set_desc *desc,
2877 const struct nlattr *nla)
2878{
2879 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2880 int err;
2881
fceb6435
JB		 2882 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2883 nft_set_desc_policy, NULL);
c50b960c
PM		 2884 if (err < 0)
2885 return err;
2886
2887 if (da[NFTA_SET_DESC_SIZE] != NULL)
2888 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2889
2890 return 0;
2891}
2892
633c9a84
PNA		 2893static int nf_tables_newset(struct net *net, struct sock *nlsk,
2894 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2895 const struct nlattr * const nla[])
2896{
2897 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2898 u8 genmask = nft_genmask_next(net);
20a69341 2899 const struct nft_set_ops *ops;
7c95f6d8 2900 struct nft_af_info *afi;
20a69341
PM		 2901 struct nft_table *table;
2902 struct nft_set *set;
2903 struct nft_ctx ctx;
cb39ad8b 2904 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2905 unsigned int size;
2906 bool create;
761da293 2907 u64 timeout;
8aeff920 2908 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 2909 struct nft_set_desc desc;
e6d8ecac
CFG		 2910 unsigned char *udata;
2911 u16 udlen;
20a69341
PM		 2912 int err;
2913
2914 if (nla[NFTA_SET_TABLE] == NULL ||
2915 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2916 nla[NFTA_SET_KEY_LEN] == NULL ||
2917 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2918 return -EINVAL;
2919
c50b960c
PM		 2920 memset(&desc, 0, sizeof(desc));
2921
20a69341
PM		 2922 ktype = NFT_DATA_VALUE;
2923 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2924 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2925 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2926 return -EINVAL;
2927 }
2928
c50b960c 2929 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2930 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2931 return -EINVAL;
2932
2933 flags = 0;
2934 if (nla[NFTA_SET_FLAGS] != NULL) {
2935 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2936 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 2937 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 2938 NFT_SET_MAP | NFT_SET_EVAL |
2939 NFT_SET_OBJECT))
20a69341 2940 return -EINVAL;
8aeff920
PNA		 2941 /* Only one of these operations is supported */
2942 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2943 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 2944 return -EOPNOTSUPP;
20a69341
PM		 2945 }
2946
2947 dtype = 0;
20a69341
PM		 2948 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2949 if (!(flags & NFT_SET_MAP))
2950 return -EINVAL;
2951
2952 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2953 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2954 dtype != NFT_DATA_VERDICT)
2955 return -EINVAL;
2956
2957 if (dtype != NFT_DATA_VERDICT) {
2958 if (nla[NFTA_SET_DATA_LEN] == NULL)
2959 return -EINVAL;
c50b960c 2960 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2961 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2962 return -EINVAL;
2963 } else
7d740264 2964 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2965 } else if (flags & NFT_SET_MAP)
2966 return -EINVAL;
2967
8aeff920
PNA		 2968 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2969 if (!(flags & NFT_SET_OBJECT))
2970 return -EINVAL;
2971
2972 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2973 if (objtype == NFT_OBJECT_UNSPEC ||
2974 objtype > NFT_OBJECT_MAX)
2975 return -EINVAL;
2976 } else if (flags & NFT_SET_OBJECT)
2977 return -EINVAL;
2978 else
2979 objtype = NFT_OBJECT_UNSPEC;
2980
761da293
PM		 2981 timeout = 0;
2982 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2983 if (!(flags & NFT_SET_TIMEOUT))
2984 return -EINVAL;
d3e2a111
AP		 2985 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2986 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 2987 }
2988 gc_int = 0;
2989 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2990 if (!(flags & NFT_SET_TIMEOUT))
2991 return -EINVAL;
2992 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2993 }
2994
c50b960c
PM		 2995 policy = NFT_SET_POL_PERFORMANCE;
2996 if (nla[NFTA_SET_POLICY] != NULL)
2997 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2998
2999 if (nla[NFTA_SET_DESC] != NULL) {
3000 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3001 if (err < 0)
3002 return err;
3003 }
3004
20a69341
PM		 3005 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3006
99633ab2 3007 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 3008 if (IS_ERR(afi))
3009 return PTR_ERR(afi);
3010
f2a6d766 3011 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 3012 if (IS_ERR(table))
3013 return PTR_ERR(table);
3014
633c9a84 3015 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3016
37a9cc52 3017 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3018 if (IS_ERR(set)) {
3019 if (PTR_ERR(set) != -ENOENT)
3020 return PTR_ERR(set);
1a28ad74 3021 } else {
20a69341
PM		 3022 if (nlh->nlmsg_flags & NLM_F_EXCL)
3023 return -EEXIST;
3024 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3025 return -EOPNOTSUPP;
3026 return 0;
3027 }
3028
3029 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3030 return -ENOENT;
3031
c50b960c 3032 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 3033 if (IS_ERR(ops))
3034 return PTR_ERR(ops);
3035
e6d8ecac
CFG		 3036 udlen = 0;
3037 if (nla[NFTA_SET_USERDATA])
3038 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3039
20a69341
PM		 3040 size = 0;
3041 if (ops->privsize != NULL)
3042 size = ops->privsize(nla);
3043
3044 err = -ENOMEM;
e6d8ecac 3045 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 3046 if (set == NULL)
3047 goto err1;
3048
3049 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3050 err = nf_tables_set_alloc_name(&ctx, set, name);
3051 if (err < 0)
3052 goto err2;
3053
e6d8ecac
CFG		 3054 udata = NULL;
3055 if (udlen) {
3056 udata = set->data + size;
3057 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3058 }
3059
20a69341
PM		 3060 INIT_LIST_HEAD(&set->bindings);
3061 set->ops = ops;
3062 set->ktype = ktype;
c50b960c 3063 set->klen = desc.klen;
20a69341 3064 set->dtype = dtype;
8aeff920 3065 set->objtype = objtype;
c50b960c 3066 set->dlen = desc.dlen;
20a69341 3067 set->flags = flags;
c50b960c 3068 set->size = desc.size;
9363dc4b 3069 set->policy = policy;
e6d8ecac
CFG		 3070 set->udlen = udlen;
3071 set->udata = udata;
761da293
PM		 3072 set->timeout = timeout;
3073 set->gc_int = gc_int;
20a69341 3074
c50b960c 3075 err = ops->init(set, &desc, nla);
20a69341
PM		 3076 if (err < 0)
3077 goto err2;
3078
958bee14 3079 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3080 if (err < 0)
c17c3cdf 3081 goto err3;
20a69341 3082
e688a7f8 3083 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3084 table->use++;
20a69341
PM		 3085 return 0;
3086
c17c3cdf
LZ		 3087err3:
3088 ops->destroy(set);
20a69341
PM		 3089err2:
3090 kfree(set);
3091err1:
3092 module_put(ops->owner);
3093 return err;
3094}
3095
958bee14 3096static void nft_set_destroy(struct nft_set *set)
20a69341 3097{
20a69341
PM		 3098 set->ops->destroy(set);
3099 module_put(set->ops->owner);
3100 kfree(set);
3101}
3102
958bee14
PNA		 3103static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3104{
e688a7f8 3105 list_del_rcu(&set->list);
31f8441c 3106 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3107 nft_set_destroy(set);
3108}
3109
633c9a84
PNA		 3110static int nf_tables_delset(struct net *net, struct sock *nlsk,
3111 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3112 const struct nlattr * const nla[])
3113{
c9c8e485 3114 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3115 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3116 struct nft_set *set;
3117 struct nft_ctx ctx;
3118 int err;
3119
ec2c9935
PM		 3120 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3121 return -EAFNOSUPPORT;
20a69341
PM		 3122 if (nla[NFTA_SET_TABLE] == NULL)
3123 return -EINVAL;
3124
f2a6d766 3125 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3126 if (err < 0)
3127 return err;
3128
37a9cc52 3129 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3130 if (IS_ERR(set))
3131 return PTR_ERR(set);
3132 if (!list_empty(&set->bindings))
3133 return -EBUSY;
3134
ee01d542 3135 return nft_delset(&ctx, set);
20a69341
PM		 3136}
3137
3138static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3139 struct nft_set *set,
20a69341 3140 const struct nft_set_iter *iter,
de70185d 3141 struct nft_set_elem *elem)
20a69341 3142{
fe2811eb 3143 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3144 enum nft_registers dreg;
3145
3146 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3147 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3148 set->dtype == NFT_DATA_VERDICT ?
3149 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3150 set->dlen);
20a69341
PM		 3151}
3152
3153int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3154 struct nft_set_binding *binding)
3155{
3156 struct nft_set_binding *i;
3157 struct nft_set_iter iter;
3158
3159 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3160 return -EBUSY;
3161
11113e19 3162 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3163 /* If the set is already bound to the same chain all
3164 * jumps are already validated for that chain.
3165 */
3166 list_for_each_entry(i, &set->bindings, list) {
a4684402 3167 if (i->flags & NFT_SET_MAP &&
11113e19 3168 i->chain == binding->chain)
20a69341
PM		 3169 goto bind;
3170 }
3171
8588ac09 3172 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3173 iter.skip = 0;
3174 iter.count = 0;
3175 iter.err = 0;
3176 iter.fn = nf_tables_bind_check_setelem;
3177
3178 set->ops->walk(ctx, set, &iter);
a02f4248 3179 if (iter.err < 0)
20a69341 3180 return iter.err;
20a69341
PM		 3181 }
3182bind:
3183 binding->chain = ctx->chain;
e688a7f8 3184 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3185 return 0;
3186}
63aea290 3187EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3188
3189void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3190 struct nft_set_binding *binding)
3191{
e688a7f8 3192 list_del_rcu(&binding->list);
20a69341 3193
958bee14 3194 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 3195 nft_is_active(ctx->net, set))
20a69341
PM		 3196 nf_tables_set_destroy(ctx, set);
3197}
63aea290 3198EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3199
3ac4c07a
PM		 3200const struct nft_set_ext_type nft_set_ext_types[] = {
3201 [NFT_SET_EXT_KEY] = {
7d740264 3202 .align = __alignof__(u32),
3ac4c07a
PM		 3203 },
3204 [NFT_SET_EXT_DATA] = {
7d740264 3205 .align = __alignof__(u32),
3ac4c07a 3206 },
f25ad2e9
PM		 3207 [NFT_SET_EXT_EXPR] = {
3208 .align = __alignof__(struct nft_expr),
3209 },
8aeff920
PNA		 3210 [NFT_SET_EXT_OBJREF] = {
3211 .len = sizeof(struct nft_object *),
3212 .align = __alignof__(struct nft_object *),
3213 },
3ac4c07a
PM		 3214 [NFT_SET_EXT_FLAGS] = {
3215 .len = sizeof(u8),
3216 .align = __alignof__(u8),
3217 },
c3e1b005
PM		 3218 [NFT_SET_EXT_TIMEOUT] = {
3219 .len = sizeof(u64),
3220 .align = __alignof__(u64),
3221 },
3222 [NFT_SET_EXT_EXPIRATION] = {
3223 .len = sizeof(unsigned long),
3224 .align = __alignof__(unsigned long),
3225 },
68e942e8
PM		 3226 [NFT_SET_EXT_USERDATA] = {
3227 .len = sizeof(struct nft_userdata),
3228 .align = __alignof__(struct nft_userdata),
3229 },
3ac4c07a
PM		 3230};
3231EXPORT_SYMBOL_GPL(nft_set_ext_types);
3232
20a69341
PM		 3233/*
3234 * Set elements
3235 */
3236
3237static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3238 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3239 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3240 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3241 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3242 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3243 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3244};
3245
3246static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3247 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3248 .len = NFT_TABLE_MAXNAMELEN - 1 },
3249 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3250 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3251 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3252 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3253};
3254
633c9a84 3255static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3256 const struct sk_buff *skb,
3257 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3258 const struct nlattr * const nla[],
3259 u8 genmask)
20a69341
PM		 3260{
3261 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3262 struct nft_af_info *afi;
3263 struct nft_table *table;
20a69341 3264
99633ab2 3265 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3266 if (IS_ERR(afi))
3267 return PTR_ERR(afi);
3268
f2a6d766
PNA		 3269 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3270 genmask);
20a69341
PM		 3271 if (IS_ERR(table))
3272 return PTR_ERR(table);
3273
633c9a84 3274 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3275 return 0;
3276}
3277
3278static int nf_tables_fill_setelem(struct sk_buff *skb,
3279 const struct nft_set *set,
3280 const struct nft_set_elem *elem)
3281{
fe2811eb 3282 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3283 unsigned char *b = skb_tail_pointer(skb);
3284 struct nlattr *nest;
3285
3286 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3287 if (nest == NULL)
3288 goto nla_put_failure;
3289
fe2811eb
PM		 3290 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3291 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3292 goto nla_put_failure;
3293
fe2811eb
PM		 3294 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3295 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3296 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3297 set->dlen) < 0)
3298 goto nla_put_failure;
3299
f25ad2e9
PM		 3300 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3301 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3302 goto nla_put_failure;
3303
8aeff920
PNA		 3304 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3305 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3306 (*nft_set_ext_obj(ext))->name) < 0)
3307 goto nla_put_failure;
3308
fe2811eb
PM		 3309 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3310 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3311 htonl(*nft_set_ext_flags(ext))))
3312 goto nla_put_failure;
20a69341 3313
c3e1b005
PM		 3314 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3315 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3316 cpu_to_be64(jiffies_to_msecs(
3317 *nft_set_ext_timeout(ext))),
b46f6ded 3318 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3319 goto nla_put_failure;
3320
3321 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3322 unsigned long expires, now = jiffies;
3323
3324 expires = *nft_set_ext_expiration(ext);
3325 if (time_before(now, expires))
3326 expires -= now;
3327 else
3328 expires = 0;
3329
3330 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3331 cpu_to_be64(jiffies_to_msecs(expires)),
3332 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3333 goto nla_put_failure;
3334 }
3335
68e942e8
PM		 3336 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3337 struct nft_userdata *udata;
3338
3339 udata = nft_set_ext_userdata(ext);
3340 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3341 udata->len + 1, udata->data))
3342 goto nla_put_failure;
3343 }
3344
20a69341
PM		 3345 nla_nest_end(skb, nest);
3346 return 0;
3347
3348nla_put_failure:
3349 nlmsg_trim(skb, b);
3350 return -EMSGSIZE;
3351}
3352
3353struct nft_set_dump_args {
3354 const struct netlink_callback *cb;
3355 struct nft_set_iter iter;
3356 struct sk_buff *skb;
3357};
3358
3359static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3360 struct nft_set *set,
20a69341 3361 const struct nft_set_iter *iter,
de70185d 3362 struct nft_set_elem *elem)
20a69341
PM		 3363{
3364 struct nft_set_dump_args *args;
3365
3366 args = container_of(iter, struct nft_set_dump_args, iter);
3367 return nf_tables_fill_setelem(args->skb, set, elem);
3368}
3369
3370static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3371{
633c9a84 3372 struct net *net = sock_net(skb->sk);
f2a6d766 3373 u8 genmask = nft_genmask_cur(net);
de70185d 3374 struct nft_set *set;
20a69341
PM		 3375 struct nft_set_dump_args args;
3376 struct nft_ctx ctx;
3377 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3378 struct nfgenmsg *nfmsg;
3379 struct nlmsghdr *nlh;
3380 struct nlattr *nest;
3381 u32 portid, seq;
3382 int event, err;
3383
720e0dfa 3384 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
fceb6435
JB		 3385 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy,
3386 NULL);
20a69341
PM		 3387 if (err < 0)
3388 return err;
3389
633c9a84 3390 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f2a6d766 3391 (void *)nla, genmask);
20a69341
PM		 3392 if (err < 0)
3393 return err;
3394
37a9cc52
PNA		 3395 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3396 genmask);
20a69341
PM		 3397 if (IS_ERR(set))
3398 return PTR_ERR(set);
3399
dedb67c4 3400 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3401 portid = NETLINK_CB(cb->skb).portid;
3402 seq = cb->nlh->nlmsg_seq;
3403
3404 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3405 NLM_F_MULTI);
3406 if (nlh == NULL)
3407 goto nla_put_failure;
3408
3409 nfmsg = nlmsg_data(nlh);
6403d962 3410 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3411 nfmsg->version = NFNETLINK_V0;
84d7fce6 3412 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3413
3414 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3415 goto nla_put_failure;
3416 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3417 goto nla_put_failure;
3418
3419 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3420 if (nest == NULL)
3421 goto nla_put_failure;
3422
8588ac09
PNA		 3423 args.cb = cb;
3424 args.skb = skb;
3425 args.iter.genmask = nft_genmask_cur(ctx.net);
3426 args.iter.skip = cb->args[0];
3427 args.iter.count = 0;
3428 args.iter.err = 0;
3429 args.iter.fn = nf_tables_dump_setelem;
20a69341
PM		 3430 set->ops->walk(&ctx, set, &args.iter);
3431
3432 nla_nest_end(skb, nest);
3433 nlmsg_end(skb, nlh);
3434
3435 if (args.iter.err && args.iter.err != -EMSGSIZE)
3436 return args.iter.err;
3437 if (args.iter.count == cb->args[0])
3438 return 0;
3439
3440 cb->args[0] = args.iter.count;
3441 return skb->len;
3442
3443nla_put_failure:
3444 return -ENOSPC;
3445}
3446
7b8002a1
PNA		 3447static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3448 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3449 const struct nlattr * const nla[])
3450{
f2a6d766 3451 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3452 const struct nft_set *set;
3453 struct nft_ctx ctx;
3454 int err;
3455
f2a6d766 3456 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3457 if (err < 0)
3458 return err;
3459
37a9cc52
PNA		 3460 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3461 genmask);
20a69341
PM		 3462 if (IS_ERR(set))
3463 return PTR_ERR(set);
3464
3465 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3466 struct netlink_dump_control c = {
3467 .dump = nf_tables_dump_set,
3468 };
3469 return netlink_dump_start(nlsk, skb, nlh, &c);
3470 }
3471 return -EOPNOTSUPP;
3472}
3473
d60ce62f
AB		 3474static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3475 const struct nft_ctx *ctx, u32 seq,
3476 u32 portid, int event, u16 flags,
3477 const struct nft_set *set,
3478 const struct nft_set_elem *elem)
3479{
3480 struct nfgenmsg *nfmsg;
3481 struct nlmsghdr *nlh;
3482 struct nlattr *nest;
3483 int err;
3484
dedb67c4 3485 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 3486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3487 flags);
3488 if (nlh == NULL)
3489 goto nla_put_failure;
3490
3491 nfmsg = nlmsg_data(nlh);
3492 nfmsg->nfgen_family = ctx->afi->family;
3493 nfmsg->version = NFNETLINK_V0;
84d7fce6 3494 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3495
3496 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3497 goto nla_put_failure;
3498 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3499 goto nla_put_failure;
3500
3501 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3502 if (nest == NULL)
3503 goto nla_put_failure;
3504
3505 err = nf_tables_fill_setelem(skb, set, elem);
3506 if (err < 0)
3507 goto nla_put_failure;
3508
3509 nla_nest_end(skb, nest);
3510
053c095a
JB		 3511 nlmsg_end(skb, nlh);
3512 return 0;
d60ce62f
AB		 3513
3514nla_put_failure:
3515 nlmsg_trim(skb, nlh);
3516 return -1;
3517}
3518
25e94a99
PNA		 3519static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3520 const struct nft_set *set,
3521 const struct nft_set_elem *elem,
3522 int event, u16 flags)
d60ce62f 3523{
128ad332
PNA		 3524 struct net *net = ctx->net;
3525 u32 portid = ctx->portid;
d60ce62f
AB		 3526 struct sk_buff *skb;
3527 int err;
3528
128ad332 3529 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 3530 return;
d60ce62f 3531
d60ce62f
AB		 3532 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3533 if (skb == NULL)
3534 goto err;
3535
3536 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3537 set, elem);
3538 if (err < 0) {
3539 kfree_skb(skb);
3540 goto err;
3541 }
3542
25e94a99
PNA		 3543 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3544 GFP_KERNEL);
3545 return;
d60ce62f 3546err:
25e94a99 3547 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 3548}
3549
60319eb1
PNA		 3550static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3551 int msg_type,
3552 struct nft_set *set)
3553{
3554 struct nft_trans *trans;
3555
3556 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3557 if (trans == NULL)
3558 return NULL;
3559
3560 nft_trans_elem_set(trans) = set;
3561 return trans;
3562}
3563
22fe54d5
PM		 3564void *nft_set_elem_init(const struct nft_set *set,
3565 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3566 const u32 *key, const u32 *data,
22fe54d5 3567 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3568{
3569 struct nft_set_ext *ext;
3570 void *elem;
3571
3572 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3573 if (elem == NULL)
3574 return NULL;
3575
3576 ext = nft_set_elem_ext(set, elem);
3577 nft_set_ext_init(ext, tmpl);
3578
3579 memcpy(nft_set_ext_key(ext), key, set->klen);
3580 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3581 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3582 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3583 *nft_set_ext_expiration(ext) =
d3e2a111 3584 jiffies + timeout;
c3e1b005
PM		 3585 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3586 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3587
3588 return elem;
3589}
3590
61f9e292
LZ		 3591void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3592 bool destroy_expr)
61edafbb
PM		 3593{
3594 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3595
3596 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3597 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3598 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
61f9e292 3599 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3600 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3601 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3602 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3603 kfree(elem);
3604}
3605EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3606
0e9091d6
PNA		 3607static int nft_setelem_parse_flags(const struct nft_set *set,
3608 const struct nlattr *attr, u32 *flags)
3609{
3610 if (attr == NULL)
3611 return 0;
3612
3613 *flags = ntohl(nla_get_be32(attr));
3614 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3615 return -EINVAL;
3616 if (!(set->flags & NFT_SET_INTERVAL) &&
3617 *flags & NFT_SET_ELEM_INTERVAL_END)
3618 return -EINVAL;
3619
3620 return 0;
3621}
3622
60319eb1 3623static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3624 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3625{
3626 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3627 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3628 struct nft_data_desc d1, d2;
fe2811eb 3629 struct nft_set_ext_tmpl tmpl;
c016c7e4 3630 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3631 struct nft_set_elem elem;
3632 struct nft_set_binding *binding;
8aeff920 3633 struct nft_object *obj = NULL;
68e942e8 3634 struct nft_userdata *udata;
fe2811eb 3635 struct nft_data data;
20a69341 3636 enum nft_registers dreg;
60319eb1 3637 struct nft_trans *trans;
0e9091d6 3638 u32 flags = 0;
c3e1b005 3639 u64 timeout;
68e942e8 3640 u8 ulen;
20a69341
PM		 3641 int err;
3642
3643 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3644 nft_set_elem_policy, NULL);
20a69341
PM		 3645 if (err < 0)
3646 return err;
3647
3648 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3649 return -EINVAL;
3650
fe2811eb
PM		 3651 nft_set_ext_prepare(&tmpl);
3652
0e9091d6
PNA		 3653 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3654 if (err < 0)
3655 return err;
3656 if (flags != 0)
3657 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3658
3659 if (set->flags & NFT_SET_MAP) {
3660 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3661 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3662 return -EINVAL;
bd7fc645 3663 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3664 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3665 return -EINVAL;
20a69341
PM		 3666 } else {
3667 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3668 return -EINVAL;
3669 }
3670
c3e1b005
PM		 3671 timeout = 0;
3672 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3673 if (!(set->flags & NFT_SET_TIMEOUT))
3674 return -EINVAL;
d3e2a111
AP		 3675 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3676 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3677 } else if (set->flags & NFT_SET_TIMEOUT) {
3678 timeout = set->timeout;
3679 }
3680
7d740264 3681 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3682 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3683 if (err < 0)
3684 goto err1;
3685 err = -EINVAL;
3686 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3687 goto err2;
3688
7d740264 3689 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3690 if (timeout > 0) {
3691 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3692 if (timeout != set->timeout)
3693 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3694 }
fe2811eb 3695
8aeff920
PNA		 3696 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3697 if (!(set->flags & NFT_SET_OBJECT)) {
3698 err = -EINVAL;
3699 goto err2;
3700 }
3701 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3702 set->objtype, genmask);
3703 if (IS_ERR(obj)) {
3704 err = PTR_ERR(obj);
3705 goto err2;
3706 }
3707 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3708 }
3709
20a69341 3710 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3711 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3712 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3713 if (err < 0)
3714 goto err2;
3715
3716 err = -EINVAL;
3717 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3718 goto err3;
3719
3720 dreg = nft_type_to_reg(set->dtype);
3721 list_for_each_entry(binding, &set->bindings, list) {
3722 struct nft_ctx bind_ctx = {
58c78e10 3723 .net = ctx->net,
20a69341
PM		 3724 .afi = ctx->afi,
3725 .table = ctx->table,
7c95f6d8 3726 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3727 };
3728
11113e19
PM		 3729 if (!(binding->flags & NFT_SET_MAP))
3730 continue;
3731
1ec10212
PM		 3732 err = nft_validate_register_store(&bind_ctx, dreg,
3733 &data,
3734 d2.type, d2.len);
20a69341
PM		 3735 if (err < 0)
3736 goto err3;
3737 }
fe2811eb 3738
7d740264 3739 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3740 }
3741
68e942e8
PM		 3742 /* The full maximum length of userdata can exceed the maximum
3743 * offset value (U8_MAX) for following extensions, therefor it
3744 * must be the last extension added.
3745 */
3746 ulen = 0;
3747 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3748 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3749 if (ulen > 0)
3750 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3751 ulen);
3752 }
3753
fe2811eb 3754 err = -ENOMEM;
7d740264 3755 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3756 timeout, GFP_KERNEL);
fe2811eb
PM		 3757 if (elem.priv == NULL)
3758 goto err3;
3759
3760 ext = nft_set_elem_ext(set, elem.priv);
3761 if (flags)
3762 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3763 if (ulen > 0) {
3764 udata = nft_set_ext_userdata(ext);
3765 udata->len = ulen - 1;
3766 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3767 }
8aeff920
PNA		 3768 if (obj) {
3769 *nft_set_ext_obj(ext) = obj;
3770 obj->use++;
3771 }
fe2811eb 3772
60319eb1
PNA		 3773 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3774 if (trans == NULL)
fe2811eb 3775 goto err4;
60319eb1 3776
69086658 3777 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 3778 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3779 if (err) {
3780 if (err == -EEXIST) {
8aeff920
PNA		 3781 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3782 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3783 memcmp(nft_set_ext_data(ext),
3784 nft_set_ext_data(ext2), set->dlen) != 0) ||
3785 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3786 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3787 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 3788 err = -EBUSY;
3789 else if (!(nlmsg_flags & NLM_F_EXCL))
3790 err = 0;
3791 }
fe2811eb 3792 goto err5;
c016c7e4 3793 }
20a69341 3794
35d0ac90
PNA		 3795 if (set->size &&
3796 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3797 err = -ENFILE;
3798 goto err6;
3799 }
3800
60319eb1 3801 nft_trans_elem(trans) = elem;
46bbafce 3802 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3803 return 0;
3804
35d0ac90 3805err6:
5cb82a38 3806 set->ops->remove(ctx->net, set, &elem);
fe2811eb 3807err5:
60319eb1 3808 kfree(trans);
fe2811eb
PM		 3809err4:
3810 kfree(elem.priv);
20a69341
PM		 3811err3:
3812 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3813 nft_data_uninit(&data, d2.type);
20a69341 3814err2:
7d740264 3815 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3816err1:
3817 return err;
3818}
3819
633c9a84
PNA		 3820static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3821 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3822 const struct nlattr * const nla[])
3823{
f2a6d766 3824 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3825 const struct nlattr *attr;
3826 struct nft_set *set;
3827 struct nft_ctx ctx;
60319eb1 3828 int rem, err = 0;
20a69341 3829
7d5570ca
PNA		 3830 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3831 return -EINVAL;
3832
f2a6d766 3833 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3834 if (err < 0)
3835 return err;
3836
37a9cc52
PNA		 3837 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3838 genmask);
958bee14
PNA		 3839 if (IS_ERR(set)) {
3840 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3841 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3842 nla[NFTA_SET_ELEM_LIST_SET_ID],
3843 genmask);
958bee14
PNA		 3844 }
3845 if (IS_ERR(set))
3846 return PTR_ERR(set);
3847 }
3848
20a69341
PM		 3849 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3850 return -EBUSY;
3851
3852 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 3853 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 3854 if (err < 0)
60319eb1 3855 break;
20a69341 3856 }
60319eb1 3857 return err;
20a69341
PM		 3858}
3859
60319eb1 3860static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3861 const struct nlattr *attr)
3862{
3863 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3864 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3865 struct nft_data_desc desc;
3866 struct nft_set_elem elem;
3971ca14 3867 struct nft_set_ext *ext;
60319eb1 3868 struct nft_trans *trans;
3971ca14
PNA		 3869 u32 flags = 0;
3870 void *priv;
20a69341
PM		 3871 int err;
3872
3873 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3874 nft_set_elem_policy, NULL);
20a69341
PM		 3875 if (err < 0)
3876 goto err1;
3877
3878 err = -EINVAL;
3879 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3880 goto err1;
3881
3971ca14
PNA		 3882 nft_set_ext_prepare(&tmpl);
3883
3884 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3885 if (err < 0)
3886 return err;
3887 if (flags != 0)
3888 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3889
7d740264 3890 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3891 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3892 if (err < 0)
3893 goto err1;
3894
3895 err = -EINVAL;
3896 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3897 goto err2;
3898
3971ca14
PNA		 3899 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3900
3901 err = -ENOMEM;
3902 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3903 GFP_KERNEL);
3904 if (elem.priv == NULL)
3905 goto err2;
3906
3907 ext = nft_set_elem_ext(set, elem.priv);
3908 if (flags)
3909 *nft_set_ext_flags(ext) = flags;
3910
60319eb1 3911 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3912 if (trans == NULL) {
3913 err = -ENOMEM;
3971ca14 3914 goto err3;
609ccf08 3915 }
20a69341 3916
42a55769 3917 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 3918 if (priv == NULL) {
cc02e457 3919 err = -ENOENT;
3971ca14 3920 goto err4;
cc02e457 3921 }
3971ca14
PNA		 3922 kfree(elem.priv);
3923 elem.priv = priv;
cc02e457 3924
60319eb1 3925 nft_trans_elem(trans) = elem;
46bbafce 3926 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3927 return 0;
cc02e457 3928
3971ca14 3929err4:
cc02e457 3930 kfree(trans);
3971ca14
PNA		 3931err3:
3932 kfree(elem.priv);
20a69341 3933err2:
7d740264 3934 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3935err1:
3936 return err;
3937}
3938
8411b644 3939static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 3940 struct nft_set *set,
8411b644 3941 const struct nft_set_iter *iter,
de70185d 3942 struct nft_set_elem *elem)
8411b644
PNA		 3943{
3944 struct nft_trans *trans;
3945 int err;
3946
3947 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3948 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3949 if (!trans)
3950 return -ENOMEM;
3951
1ba1c414 3952 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 3953 err = -ENOENT;
3954 goto err1;
3955 }
b2c11e4b 3956 set->ndeact++;
8411b644 3957
de70185d
PNA		 3958 nft_trans_elem_set(trans) = set;
3959 nft_trans_elem(trans) = *elem;
8411b644
PNA		 3960 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3961
3962 return 0;
3963err1:
3964 kfree(trans);
3965 return err;
3966}
3967
633c9a84
PNA		 3968static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3969 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3970 const struct nlattr * const nla[])
3971{
f2a6d766 3972 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3973 const struct nlattr *attr;
3974 struct nft_set *set;
3975 struct nft_ctx ctx;
60319eb1 3976 int rem, err = 0;
20a69341 3977
f2a6d766 3978 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3979 if (err < 0)
3980 return err;
3981
37a9cc52
PNA		 3982 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3983 genmask);
20a69341
PM		 3984 if (IS_ERR(set))
3985 return PTR_ERR(set);
3986 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3987 return -EBUSY;
3988
8411b644 3989 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 3990 struct nft_set_iter iter = {
3991 .genmask = genmask,
3992 .fn = nft_flush_set,
8411b644 3993 };
baa2d42c 3994 set->ops->walk(&ctx, set, &iter);
8411b644 3995
baa2d42c 3996 return iter.err;
8411b644
PNA		 3997 }
3998
20a69341
PM		 3999 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4000 err = nft_del_setelem(&ctx, set, attr);
4001 if (err < 0)
60319eb1 4002 break;
4fefee57 4003
3dd0673a 4004 set->ndeact++;
20a69341 4005 }
60319eb1 4006 return err;
20a69341
PM		 4007}
4008
cfed7e1b
PM		 4009void nft_set_gc_batch_release(struct rcu_head *rcu)
4010{
4011 struct nft_set_gc_batch *gcb;
4012 unsigned int i;
4013
4014 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4015 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4016 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4017 kfree(gcb);
4018}
4019EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4020
4021struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4022 gfp_t gfp)
4023{
4024 struct nft_set_gc_batch *gcb;
4025
4026 gcb = kzalloc(sizeof(*gcb), gfp);
4027 if (gcb == NULL)
4028 return gcb;
4029 gcb->head.set = set;
4030 return gcb;
4031}
4032EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4033
e5009240
PNA		 4034/*
4035 * Stateful objects
4036 */
4037
4038/**
4039 * nft_register_obj- register nf_tables stateful object type
4040 * @obj: object type
4041 *
4042 * Registers the object type for use with nf_tables. Returns zero on
4043 * success or a negative errno code otherwise.
4044 */
4045int nft_register_obj(struct nft_object_type *obj_type)
4046{
4047 if (obj_type->type == NFT_OBJECT_UNSPEC)
4048 return -EINVAL;
4049
4050 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4051 list_add_rcu(&obj_type->list, &nf_tables_objects);
4052 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4053 return 0;
4054}
4055EXPORT_SYMBOL_GPL(nft_register_obj);
4056
4057/**
4058 * nft_unregister_obj - unregister nf_tables object type
4059 * @obj: object type
4060 *
4061 * Unregisters the object type for use with nf_tables.
4062 */
4063void nft_unregister_obj(struct nft_object_type *obj_type)
4064{
4065 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4066 list_del_rcu(&obj_type->list);
4067 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4068}
4069EXPORT_SYMBOL_GPL(nft_unregister_obj);
4070
4071struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4072 const struct nlattr *nla,
4073 u32 objtype, u8 genmask)
4074{
4075 struct nft_object *obj;
4076
4077 list_for_each_entry(obj, &table->objects, list) {
4078 if (!nla_strcmp(nla, obj->name) &&
4079 objtype == obj->type->type &&
4080 nft_active_genmask(obj, genmask))
4081 return obj;
4082 }
4083 return ERR_PTR(-ENOENT);
4084}
4085EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4086
4087static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4088 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4089 .len = NFT_TABLE_MAXNAMELEN - 1 },
4090 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4091 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4092 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4093 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4094};
4095
84fba055
FW		 4096static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4097 const struct nft_object_type *type,
e5009240
PNA		 4098 const struct nlattr *attr)
4099{
4100 struct nlattr *tb[type->maxattr + 1];
4101 struct nft_object *obj;
4102 int err;
4103
4104 if (attr) {
fceb6435
JB		 4105 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4106 NULL);
e5009240
PNA		 4107 if (err < 0)
4108 goto err1;
4109 } else {
4110 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4111 }
4112
4113 err = -ENOMEM;
4114 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4115 if (obj == NULL)
4116 goto err1;
4117
84fba055 4118 err = type->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240
PNA		 4119 if (err < 0)
4120 goto err2;
4121
4122 obj->type = type;
4123 return obj;
4124err2:
4125 kfree(obj);
4126err1:
4127 return ERR_PTR(err);
4128}
4129
4130static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4131 struct nft_object *obj, bool reset)
e5009240
PNA		 4132{
4133 struct nlattr *nest;
4134
4135 nest = nla_nest_start(skb, attr);
4136 if (!nest)
4137 goto nla_put_failure;
43da04a5 4138 if (obj->type->dump(skb, obj, reset) < 0)
e5009240
PNA		 4139 goto nla_put_failure;
4140 nla_nest_end(skb, nest);
4141 return 0;
4142
4143nla_put_failure:
4144 return -1;
4145}
4146
4147static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4148{
4149 const struct nft_object_type *type;
4150
4151 list_for_each_entry(type, &nf_tables_objects, list) {
4152 if (objtype == type->type)
4153 return type;
4154 }
4155 return NULL;
4156}
4157
4158static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4159{
4160 const struct nft_object_type *type;
4161
4162 type = __nft_obj_type_get(objtype);
4163 if (type != NULL && try_module_get(type->owner))
4164 return type;
4165
4166#ifdef CONFIG_MODULES
4167 if (type == NULL) {
4168 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4169 request_module("nft-obj-%u", objtype);
4170 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4171 if (__nft_obj_type_get(objtype))
4172 return ERR_PTR(-EAGAIN);
4173 }
4174#endif
4175 return ERR_PTR(-ENOENT);
4176}
4177
4178static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4179 struct sk_buff *skb, const struct nlmsghdr *nlh,
4180 const struct nlattr * const nla[])
4181{
4182 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4183 const struct nft_object_type *type;
4184 u8 genmask = nft_genmask_next(net);
4185 int family = nfmsg->nfgen_family;
4186 struct nft_af_info *afi;
4187 struct nft_table *table;
4188 struct nft_object *obj;
4189 struct nft_ctx ctx;
4190 u32 objtype;
4191 int err;
4192
4193 if (!nla[NFTA_OBJ_TYPE] ||
4194 !nla[NFTA_OBJ_NAME] ||
4195 !nla[NFTA_OBJ_DATA])
4196 return -EINVAL;
4197
4198 afi = nf_tables_afinfo_lookup(net, family, true);
4199 if (IS_ERR(afi))
4200 return PTR_ERR(afi);
4201
4202 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4203 if (IS_ERR(table))
4204 return PTR_ERR(table);
4205
4206 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4207 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4208 if (IS_ERR(obj)) {
4209 err = PTR_ERR(obj);
4210 if (err != -ENOENT)
4211 return err;
4212
1a28ad74 4213 } else {
e5009240
PNA		 4214 if (nlh->nlmsg_flags & NLM_F_EXCL)
4215 return -EEXIST;
4216
4217 return 0;
4218 }
4219
4220 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4221
4222 type = nft_obj_type_get(objtype);
4223 if (IS_ERR(type))
4224 return PTR_ERR(type);
4225
84fba055 4226 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4227 if (IS_ERR(obj)) {
4228 err = PTR_ERR(obj);
4229 goto err1;
4230 }
18965317 4231 obj->table = table;
e5009240
PNA		 4232 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4233
4234 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4235 if (err < 0)
4236 goto err2;
4237
4238 list_add_tail_rcu(&obj->list, &table->objects);
4239 table->use++;
4240 return 0;
4241err2:
4242 if (obj->type->destroy)
4243 obj->type->destroy(obj);
4244 kfree(obj);
4245err1:
4246 module_put(type->owner);
4247 return err;
4248}
4249
4250static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4251 u32 portid, u32 seq, int event, u32 flags,
4252 int family, const struct nft_table *table,
43da04a5 4253 struct nft_object *obj, bool reset)
e5009240
PNA		 4254{
4255 struct nfgenmsg *nfmsg;
4256 struct nlmsghdr *nlh;
4257
dedb67c4 4258 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 4259 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4260 if (nlh == NULL)
4261 goto nla_put_failure;
4262
4263 nfmsg = nlmsg_data(nlh);
4264 nfmsg->nfgen_family = family;
4265 nfmsg->version = NFNETLINK_V0;
4266 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4267
4268 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4269 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4270 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4271 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4272 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4273 goto nla_put_failure;
4274
4275 nlmsg_end(skb, nlh);
4276 return 0;
4277
4278nla_put_failure:
4279 nlmsg_trim(skb, nlh);
4280 return -1;
4281}
4282
a9fea2a3
PNA		 4283struct nft_obj_filter {
4284 char table[NFT_OBJ_MAXNAMELEN];
4285 u32 type;
4286};
4287
e5009240
PNA		 4288static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4289{
4290 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4291 const struct nft_af_info *afi;
4292 const struct nft_table *table;
e5009240 4293 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4294 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4295 struct net *net = sock_net(skb->sk);
4296 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4297 struct nft_object *obj;
4298 bool reset = false;
4299
4300 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4301 reset = true;
e5009240
PNA		 4302
4303 rcu_read_lock();
4304 cb->seq = net->nft.base_seq;
4305
4306 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4307 if (family != NFPROTO_UNSPEC && family != afi->family)
4308 continue;
4309
4310 list_for_each_entry_rcu(table, &afi->tables, list) {
4311 list_for_each_entry_rcu(obj, &table->objects, list) {
4312 if (!nft_is_active(net, obj))
4313 goto cont;
4314 if (idx < s_idx)
4315 goto cont;
4316 if (idx > s_idx)
4317 memset(&cb->args[1], 0,
4318 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4319 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4320 strcmp(filter->table, table->name))
4321 goto cont;
d21e540b
LZ		 4322 if (filter &&
4323 filter->type != NFT_OBJECT_UNSPEC &&
a9fea2a3
PNA		 4324 obj->type->type != filter->type)
4325 goto cont;
4326
e5009240
PNA		 4327 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4328 cb->nlh->nlmsg_seq,
4329 NFT_MSG_NEWOBJ,
4330 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4331 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4332 goto done;
4333
4334 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4335cont:
4336 idx++;
4337 }
4338 }
4339 }
4340done:
4341 rcu_read_unlock();
4342
4343 cb->args[0] = idx;
4344 return skb->len;
4345}
4346
a9fea2a3
PNA		 4347static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4348{
4349 kfree(cb->data);
4350
4351 return 0;
4352}
4353
4354static struct nft_obj_filter *
4355nft_obj_filter_alloc(const struct nlattr * const nla[])
4356{
4357 struct nft_obj_filter *filter;
4358
4359 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4360 if (!filter)
4361 return ERR_PTR(-ENOMEM);
4362
4363 if (nla[NFTA_OBJ_TABLE])
4364 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4365 NFT_TABLE_MAXNAMELEN);
4366 if (nla[NFTA_OBJ_TYPE])
4367 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4368
4369 return filter;
4370}
4371
e5009240
PNA		 4372static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4373 struct sk_buff *skb, const struct nlmsghdr *nlh,
4374 const struct nlattr * const nla[])
4375{
4376 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4377 u8 genmask = nft_genmask_cur(net);
4378 int family = nfmsg->nfgen_family;
4379 const struct nft_af_info *afi;
4380 const struct nft_table *table;
4381 struct nft_object *obj;
4382 struct sk_buff *skb2;
43da04a5 4383 bool reset = false;
e5009240
PNA		 4384 u32 objtype;
4385 int err;
4386
4387 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4388 struct netlink_dump_control c = {
4389 .dump = nf_tables_dump_obj,
a9fea2a3 4390 .done = nf_tables_dump_obj_done,
e5009240 4391 };
a9fea2a3
PNA		 4392
4393 if (nla[NFTA_OBJ_TABLE] ||
4394 nla[NFTA_OBJ_TYPE]) {
4395 struct nft_obj_filter *filter;
4396
4397 filter = nft_obj_filter_alloc(nla);
4398 if (IS_ERR(filter))
4399 return -ENOMEM;
4400
4401 c.data = filter;
4402 }
e5009240
PNA		 4403 return netlink_dump_start(nlsk, skb, nlh, &c);
4404 }
4405
4406 if (!nla[NFTA_OBJ_NAME] ||
4407 !nla[NFTA_OBJ_TYPE])
4408 return -EINVAL;
4409
4410 afi = nf_tables_afinfo_lookup(net, family, false);
4411 if (IS_ERR(afi))
4412 return PTR_ERR(afi);
4413
4414 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4415 if (IS_ERR(table))
4416 return PTR_ERR(table);
4417
4418 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4419 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4420 if (IS_ERR(obj))
4421 return PTR_ERR(obj);
4422
4423 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4424 if (!skb2)
4425 return -ENOMEM;
4426
43da04a5
PNA		 4427 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4428 reset = true;
4429
e5009240
PNA		 4430 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4431 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4432 family, table, obj, reset);
e5009240
PNA		 4433 if (err < 0)
4434 goto err;
4435
4436 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4437err:
4438 kfree_skb(skb2);
4439 return err;
e5009240
PNA		 4440}
4441
4442static void nft_obj_destroy(struct nft_object *obj)
4443{
4444 if (obj->type->destroy)
4445 obj->type->destroy(obj);
4446
4447 module_put(obj->type->owner);
4448 kfree(obj);
4449}
4450
4451static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4452 struct sk_buff *skb, const struct nlmsghdr *nlh,
4453 const struct nlattr * const nla[])
4454{
4455 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4456 u8 genmask = nft_genmask_next(net);
4457 int family = nfmsg->nfgen_family;
4458 struct nft_af_info *afi;
4459 struct nft_table *table;
4460 struct nft_object *obj;
4461 struct nft_ctx ctx;
4462 u32 objtype;
4463
4464 if (!nla[NFTA_OBJ_TYPE] ||
4465 !nla[NFTA_OBJ_NAME])
4466 return -EINVAL;
4467
4468 afi = nf_tables_afinfo_lookup(net, family, true);
4469 if (IS_ERR(afi))
4470 return PTR_ERR(afi);
4471
4472 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4473 if (IS_ERR(table))
4474 return PTR_ERR(table);
4475
4476 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4477 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4478 if (IS_ERR(obj))
4479 return PTR_ERR(obj);
4480 if (obj->use > 0)
4481 return -EBUSY;
4482
4483 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4484
4485 return nft_delobj(&ctx, obj);
4486}
4487
25e94a99
PNA		 4488void nft_obj_notify(struct net *net, struct nft_table *table,
4489 struct nft_object *obj, u32 portid, u32 seq, int event,
4490 int family, int report, gfp_t gfp)
e5009240
PNA		 4491{
4492 struct sk_buff *skb;
4493 int err;
4494
2599e989
PNA		 4495 if (!report &&
4496 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4497 return;
e5009240 4498
2599e989 4499 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4500 if (skb == NULL)
4501 goto err;
4502
2599e989
PNA		 4503 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4504 table, obj, false);
e5009240
PNA		 4505 if (err < 0) {
4506 kfree_skb(skb);
4507 goto err;
4508 }
4509
25e94a99
PNA		 4510 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4511 return;
e5009240 4512err:
25e94a99 4513 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 4514}
2599e989
PNA		 4515EXPORT_SYMBOL_GPL(nft_obj_notify);
4516
25e94a99
PNA		 4517static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4518 struct nft_object *obj, int event)
2599e989 4519{
25e94a99
PNA		 4520 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4521 ctx->afi->family, ctx->report, GFP_KERNEL);
2599e989 4522}
e5009240 4523
84d7fce6
PNA		 4524static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4525 u32 portid, u32 seq)
4526{
4527 struct nlmsghdr *nlh;
4528 struct nfgenmsg *nfmsg;
dedb67c4 4529 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 4530
4531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4532 if (nlh == NULL)
4533 goto nla_put_failure;
4534
4535 nfmsg = nlmsg_data(nlh);
4536 nfmsg->nfgen_family = AF_UNSPEC;
4537 nfmsg->version = NFNETLINK_V0;
4538 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4539
4540 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4541 goto nla_put_failure;
4542
053c095a
JB		 4543 nlmsg_end(skb, nlh);
4544 return 0;
84d7fce6
PNA		 4545
4546nla_put_failure:
4547 nlmsg_trim(skb, nlh);
4548 return -EMSGSIZE;
4549}
4550
25e94a99
PNA		 4551static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4552 int event)
84d7fce6
PNA		 4553{
4554 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4555 struct sk_buff *skb2;
4556 int err;
4557
4558 if (nlmsg_report(nlh) &&
4559 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4560 return;
84d7fce6 4561
84d7fce6
PNA		 4562 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4563 if (skb2 == NULL)
4564 goto err;
4565
4566 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4567 nlh->nlmsg_seq);
4568 if (err < 0) {
4569 kfree_skb(skb2);
4570 goto err;
4571 }
4572
25e94a99
PNA		 4573 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4574 nlmsg_report(nlh), GFP_KERNEL);
4575 return;
84d7fce6 4576err:
25e94a99
PNA		 4577 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4578 -ENOBUFS);
84d7fce6
PNA		 4579}
4580
7b8002a1
PNA		 4581static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4582 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 4583 const struct nlattr * const nla[])
4584{
84d7fce6
PNA		 4585 struct sk_buff *skb2;
4586 int err;
4587
4588 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4589 if (skb2 == NULL)
4590 return -ENOMEM;
4591
4592 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4593 nlh->nlmsg_seq);
4594 if (err < 0)
4595 goto err;
4596
4597 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4598err:
4599 kfree_skb(skb2);
4600 return err;
4601}
4602
96518518
PM		 4603static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4604 [NFT_MSG_NEWTABLE] = {
55dd6f93 4605 .call_batch = nf_tables_newtable,
96518518
PM		 4606 .attr_count = NFTA_TABLE_MAX,
4607 .policy = nft_table_policy,
4608 },
4609 [NFT_MSG_GETTABLE] = {
4610 .call = nf_tables_gettable,
4611 .attr_count = NFTA_TABLE_MAX,
4612 .policy = nft_table_policy,
4613 },
4614 [NFT_MSG_DELTABLE] = {
55dd6f93 4615 .call_batch = nf_tables_deltable,
96518518
PM		 4616 .attr_count = NFTA_TABLE_MAX,
4617 .policy = nft_table_policy,
4618 },
4619 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4620 .call_batch = nf_tables_newchain,
96518518
PM		 4621 .attr_count = NFTA_CHAIN_MAX,
4622 .policy = nft_chain_policy,
4623 },
4624 [NFT_MSG_GETCHAIN] = {
4625 .call = nf_tables_getchain,
4626 .attr_count = NFTA_CHAIN_MAX,
4627 .policy = nft_chain_policy,
4628 },
4629 [NFT_MSG_DELCHAIN] = {
91c7b38d 4630 .call_batch = nf_tables_delchain,
96518518
PM		 4631 .attr_count = NFTA_CHAIN_MAX,
4632 .policy = nft_chain_policy,
4633 },
4634 [NFT_MSG_NEWRULE] = {
0628b123 4635 .call_batch = nf_tables_newrule,
96518518
PM		 4636 .attr_count = NFTA_RULE_MAX,
4637 .policy = nft_rule_policy,
4638 },
4639 [NFT_MSG_GETRULE] = {
4640 .call = nf_tables_getrule,
4641 .attr_count = NFTA_RULE_MAX,
4642 .policy = nft_rule_policy,
4643 },
4644 [NFT_MSG_DELRULE] = {
0628b123 4645 .call_batch = nf_tables_delrule,
96518518
PM		 4646 .attr_count = NFTA_RULE_MAX,
4647 .policy = nft_rule_policy,
4648 },
20a69341 4649 [NFT_MSG_NEWSET] = {
958bee14 4650 .call_batch = nf_tables_newset,
20a69341
PM		 4651 .attr_count = NFTA_SET_MAX,
4652 .policy = nft_set_policy,
4653 },
4654 [NFT_MSG_GETSET] = {
4655 .call = nf_tables_getset,
4656 .attr_count = NFTA_SET_MAX,
4657 .policy = nft_set_policy,
4658 },
4659 [NFT_MSG_DELSET] = {
958bee14 4660 .call_batch = nf_tables_delset,
20a69341
PM		 4661 .attr_count = NFTA_SET_MAX,
4662 .policy = nft_set_policy,
4663 },
4664 [NFT_MSG_NEWSETELEM] = {
958bee14 4665 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4666 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4667 .policy = nft_set_elem_list_policy,
4668 },
4669 [NFT_MSG_GETSETELEM] = {
4670 .call = nf_tables_getsetelem,
4671 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4672 .policy = nft_set_elem_list_policy,
4673 },
4674 [NFT_MSG_DELSETELEM] = {
958bee14 4675 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4676 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4677 .policy = nft_set_elem_list_policy,
4678 },
84d7fce6
PNA		 4679 [NFT_MSG_GETGEN] = {
4680 .call = nf_tables_getgen,
4681 },
e5009240
PNA		 4682 [NFT_MSG_NEWOBJ] = {
4683 .call_batch = nf_tables_newobj,
4684 .attr_count = NFTA_OBJ_MAX,
4685 .policy = nft_obj_policy,
4686 },
4687 [NFT_MSG_GETOBJ] = {
4688 .call = nf_tables_getobj,
4689 .attr_count = NFTA_OBJ_MAX,
4690 .policy = nft_obj_policy,
4691 },
4692 [NFT_MSG_DELOBJ] = {
4693 .call_batch = nf_tables_delobj,
4694 .attr_count = NFTA_OBJ_MAX,
4695 .policy = nft_obj_policy,
4696 },
43da04a5
PNA		 4697 [NFT_MSG_GETOBJ_RESET] = {
4698 .call = nf_tables_getobj,
4699 .attr_count = NFTA_OBJ_MAX,
4700 .policy = nft_obj_policy,
4701 },
96518518
PM		 4702};
4703
91c7b38d
PNA		 4704static void nft_chain_commit_update(struct nft_trans *trans)
4705{
4706 struct nft_base_chain *basechain;
4707
4708 if (nft_trans_chain_name(trans)[0])
4709 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4710
f323d954 4711 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 4712 return;
4713
4714 basechain = nft_base_chain(trans->ctx.chain);
4715 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4716
4717 switch (nft_trans_chain_policy(trans)) {
4718 case NF_DROP:
4719 case NF_ACCEPT:
4720 basechain->policy = nft_trans_chain_policy(trans);
4721 break;
4722 }
4723}
4724
b326dd37 4725static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 4726{
c7c32e72
PNA		 4727 switch (trans->msg_type) {
4728 case NFT_MSG_DELTABLE:
4729 nf_tables_table_destroy(&trans->ctx);
4730 break;
4731 case NFT_MSG_DELCHAIN:
4732 nf_tables_chain_destroy(trans->ctx.chain);
4733 break;
4734 case NFT_MSG_DELRULE:
4735 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4736 break;
4737 case NFT_MSG_DELSET:
4738 nft_set_destroy(nft_trans_set(trans));
4739 break;
61edafbb
PM		 4740 case NFT_MSG_DELSETELEM:
4741 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4742 nft_trans_elem(trans).priv, true);
61edafbb 4743 break;
e5009240
PNA		 4744 case NFT_MSG_DELOBJ:
4745 nft_obj_destroy(nft_trans_obj(trans));
4746 break;
c7c32e72
PNA		 4747 }
4748 kfree(trans);
4749}
4750
5913beaf 4751static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 4752{
37082f93 4753 struct nft_trans *trans, *next;
a3716e70 4754 struct nft_trans_elem *te;
37082f93
PNA		 4755
4756 /* Bump generation counter, invalidate any dump in progress */
38e029f1 4757 while (++net->nft.base_seq == 0);
37082f93
PNA		 4758
4759 /* A new generation has just started */
ea4bd995 4760 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 4761
4762 /* Make sure all packets have left the previous generation before
4763 * purging old rules.
4764 */
4765 synchronize_rcu();
4766
4767 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 4768 switch (trans->msg_type) {
55dd6f93
PNA		 4769 case NFT_MSG_NEWTABLE:
4770 if (nft_trans_table_update(trans)) {
4771 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4772 nf_tables_table_disable(net,
4773 trans->ctx.afi,
55dd6f93
PNA		 4774 trans->ctx.table);
4775 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4776 }
4777 } else {
f2a6d766 4778 nft_clear(net, trans->ctx.table);
55dd6f93 4779 }
35151d84 4780 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 4781 nft_trans_destroy(trans);
4782 break;
4783 case NFT_MSG_DELTABLE:
f2a6d766 4784 list_del_rcu(&trans->ctx.table->list);
35151d84 4785 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 4786 break;
91c7b38d
PNA		 4787 case NFT_MSG_NEWCHAIN:
4788 if (nft_trans_chain_update(trans))
4789 nft_chain_commit_update(trans);
4fefee57 4790 else
664b0f8c 4791 nft_clear(net, trans->ctx.chain);
4fefee57 4792
35151d84 4793 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 4794 nft_trans_destroy(trans);
4795 break;
4796 case NFT_MSG_DELCHAIN:
664b0f8c 4797 list_del_rcu(&trans->ctx.chain->list);
35151d84 4798 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 4799 nf_tables_unregister_hooks(trans->ctx.net,
4800 trans->ctx.table,
c5598794
AB		 4801 trans->ctx.chain,
4802 trans->ctx.afi->nops);
91c7b38d 4803 break;
b380e5c7 4804 case NFT_MSG_NEWRULE:
889f7ee7 4805 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 4806 nf_tables_rule_notify(&trans->ctx,
37082f93 4807 nft_trans_rule(trans),
35151d84 4808 NFT_MSG_NEWRULE);
37082f93 4809 nft_trans_destroy(trans);
b380e5c7
PNA		 4810 break;
4811 case NFT_MSG_DELRULE:
4812 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 4813 nf_tables_rule_notify(&trans->ctx,
4814 nft_trans_rule(trans),
4815 NFT_MSG_DELRULE);
b380e5c7 4816 break;
958bee14 4817 case NFT_MSG_NEWSET:
37a9cc52 4818 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 4819 /* This avoids hitting -EBUSY when deleting the table
4820 * from the transaction.
4821 */
4822 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4823 !list_empty(&nft_trans_set(trans)->bindings))
4824 trans->ctx.table->use--;
4825
958bee14 4826 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4827 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4828 nft_trans_destroy(trans);
4829 break;
4830 case NFT_MSG_DELSET:
37a9cc52 4831 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 4832 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4833 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4834 break;
60319eb1 4835 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4836 te = (struct nft_trans_elem *)trans->data;
4837
42a55769 4838 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 4839 nf_tables_setelem_notify(&trans->ctx, te->set,
4840 &te->elem,
60319eb1
PNA		 4841 NFT_MSG_NEWSETELEM, 0);
4842 nft_trans_destroy(trans);
4843 break;
4844 case NFT_MSG_DELSETELEM:
a3716e70 4845 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4846
a3716e70
PNA		 4847 nf_tables_setelem_notify(&trans->ctx, te->set,
4848 &te->elem,
60319eb1 4849 NFT_MSG_DELSETELEM, 0);
5cb82a38 4850 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 4851 atomic_dec(&te->set->nelems);
4852 te->set->ndeact--;
60319eb1 4853 break;
e5009240
PNA		 4854 case NFT_MSG_NEWOBJ:
4855 nft_clear(net, nft_trans_obj(trans));
4856 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4857 NFT_MSG_NEWOBJ);
4858 nft_trans_destroy(trans);
4859 break;
4860 case NFT_MSG_DELOBJ:
4861 list_del_rcu(&nft_trans_obj(trans)->list);
4862 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4863 NFT_MSG_DELOBJ);
4864 break;
37082f93 4865 }
37082f93
PNA		 4866 }
4867
b326dd37
PNA		 4868 synchronize_rcu();
4869
37082f93 4870 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4871 list_del(&trans->list);
b326dd37 4872 nf_tables_commit_release(trans);
37082f93 4873 }
84d7fce6
PNA		 4874
4875 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4876
4877 return 0;
4878}
4879
b326dd37 4880static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4881{
c7c32e72
PNA		 4882 switch (trans->msg_type) {
4883 case NFT_MSG_NEWTABLE:
4884 nf_tables_table_destroy(&trans->ctx);
4885 break;
4886 case NFT_MSG_NEWCHAIN:
4887 nf_tables_chain_destroy(trans->ctx.chain);
4888 break;
4889 case NFT_MSG_NEWRULE:
4890 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4891 break;
4892 case NFT_MSG_NEWSET:
4893 nft_set_destroy(nft_trans_set(trans));
4894 break;
61edafbb
PM		 4895 case NFT_MSG_NEWSETELEM:
4896 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4897 nft_trans_elem(trans).priv, true);
61edafbb 4898 break;
e5009240
PNA		 4899 case NFT_MSG_NEWOBJ:
4900 nft_obj_destroy(nft_trans_obj(trans));
4901 break;
c7c32e72
PNA		 4902 }
4903 kfree(trans);
4904}
4905
5913beaf 4906static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4907{
37082f93 4908 struct nft_trans *trans, *next;
02263db0 4909 struct nft_trans_elem *te;
37082f93 4910
a907e36d
XL		 4911 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4912 list) {
b380e5c7 4913 switch (trans->msg_type) {
55dd6f93
PNA		 4914 case NFT_MSG_NEWTABLE:
4915 if (nft_trans_table_update(trans)) {
4916 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4917 nf_tables_table_disable(net,
4918 trans->ctx.afi,
55dd6f93
PNA		 4919 trans->ctx.table);
4920 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4921 }
4922 nft_trans_destroy(trans);
4923 } else {
e688a7f8 4924 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4925 }
4926 break;
4927 case NFT_MSG_DELTABLE:
f2a6d766 4928 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 4929 nft_trans_destroy(trans);
4930 break;
91c7b38d
PNA		 4931 case NFT_MSG_NEWCHAIN:
4932 if (nft_trans_chain_update(trans)) {
982f4051 4933 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4934
4935 nft_trans_destroy(trans);
4936 } else {
4fefee57 4937 trans->ctx.table->use--;
e688a7f8 4938 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 4939 nf_tables_unregister_hooks(trans->ctx.net,
4940 trans->ctx.table,
c5598794
AB		 4941 trans->ctx.chain,
4942 trans->ctx.afi->nops);
91c7b38d
PNA		 4943 }
4944 break;
4945 case NFT_MSG_DELCHAIN:
4fefee57 4946 trans->ctx.table->use++;
664b0f8c 4947 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 4948 nft_trans_destroy(trans);
4949 break;
b380e5c7 4950 case NFT_MSG_NEWRULE:
4fefee57 4951 trans->ctx.chain->use--;
b380e5c7
PNA		 4952 list_del_rcu(&nft_trans_rule(trans)->list);
4953 break;
4954 case NFT_MSG_DELRULE:
4fefee57 4955 trans->ctx.chain->use++;
889f7ee7 4956 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4957 nft_trans_destroy(trans);
b380e5c7 4958 break;
958bee14 4959 case NFT_MSG_NEWSET:
4fefee57 4960 trans->ctx.table->use--;
e688a7f8 4961 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4962 break;
4963 case NFT_MSG_DELSET:
4fefee57 4964 trans->ctx.table->use++;
37a9cc52 4965 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 4966 nft_trans_destroy(trans);
4967 break;
60319eb1 4968 case NFT_MSG_NEWSETELEM:
02263db0 4969 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4970
5cb82a38 4971 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 4972 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4973 break;
4974 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4975 te = (struct nft_trans_elem *)trans->data;
4976
42a55769 4977 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 4978 te->set->ndeact--;
cc02e457 4979
e5009240
PNA		 4980 nft_trans_destroy(trans);
4981 break;
4982 case NFT_MSG_NEWOBJ:
4983 trans->ctx.table->use--;
4984 list_del_rcu(&nft_trans_obj(trans)->list);
4985 break;
4986 case NFT_MSG_DELOBJ:
4987 trans->ctx.table->use++;
4988 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 4989 nft_trans_destroy(trans);
4990 break;
37082f93 4991 }
37082f93
PNA		 4992 }
4993
b326dd37
PNA		 4994 synchronize_rcu();
4995
a1cee076
PNA		 4996 list_for_each_entry_safe_reverse(trans, next,
4997 &net->nft.commit_list, list) {
c7c32e72 4998 list_del(&trans->list);
b326dd37 4999 nf_tables_abort_release(trans);
37082f93
PNA		 5000 }
5001
5002 return 0;
5003}
5004
74e8bcd2
PNA		 5005static bool nf_tables_valid_genid(struct net *net, u32 genid)
5006{
5007 return net->nft.base_seq == genid;
5008}
5009
96518518
PM		 5010static const struct nfnetlink_subsystem nf_tables_subsys = {
5011 .name = "nf_tables",
5012 .subsys_id = NFNL_SUBSYS_NFTABLES,
5013 .cb_count = NFT_MSG_MAX,
5014 .cb = nf_tables_cb,
0628b123
PNA		 5015 .commit = nf_tables_commit,
5016 .abort = nf_tables_abort,
74e8bcd2 5017 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5018};
5019
7210e4e3
PNA		 5020int nft_chain_validate_dependency(const struct nft_chain *chain,
5021 enum nft_chain_type type)
5022{
5023 const struct nft_base_chain *basechain;
5024
f323d954 5025 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 5026 basechain = nft_base_chain(chain);
5027 if (basechain->type->type != type)
5028 return -EOPNOTSUPP;
5029 }
5030 return 0;
5031}
5032EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5033
75e8d06d
PNA		 5034int nft_chain_validate_hooks(const struct nft_chain *chain,
5035 unsigned int hook_flags)
5036{
5037 struct nft_base_chain *basechain;
5038
f323d954 5039 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 5040 basechain = nft_base_chain(chain);
5041
5042 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5043 return 0;
5044
5045 return -EOPNOTSUPP;
5046 }
5047
5048 return 0;
5049}
5050EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5051
20a69341
PM		 5052/*
5053 * Loop detection - walk through the ruleset beginning at the destination chain
5054 * of a new jump until either the source chain is reached (loop) or all
5055 * reachable chains have been traversed.
5056 *
5057 * The loop check is performed whenever a new jump verdict is added to an
5058 * expression or verdict map or a verdict map is bound to a new chain.
5059 */
5060
5061static int nf_tables_check_loops(const struct nft_ctx *ctx,
5062 const struct nft_chain *chain);
5063
5064static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5065 struct nft_set *set,
20a69341 5066 const struct nft_set_iter *iter,
de70185d 5067 struct nft_set_elem *elem)
20a69341 5068{
fe2811eb
PM		 5069 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5070 const struct nft_data *data;
5071
5072 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5073 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5074 return 0;
5075
fe2811eb 5076 data = nft_set_ext_data(ext);
1ca2e170 5077 switch (data->verdict.code) {
20a69341
PM		 5078 case NFT_JUMP:
5079 case NFT_GOTO:
1ca2e170 5080 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5081 default:
5082 return 0;
5083 }
5084}
5085
5086static int nf_tables_check_loops(const struct nft_ctx *ctx,
5087 const struct nft_chain *chain)
5088{
5089 const struct nft_rule *rule;
5090 const struct nft_expr *expr, *last;
de70185d 5091 struct nft_set *set;
20a69341
PM		 5092 struct nft_set_binding *binding;
5093 struct nft_set_iter iter;
20a69341
PM		 5094
5095 if (ctx->chain == chain)
5096 return -ELOOP;
5097
5098 list_for_each_entry(rule, &chain->rules, list) {
5099 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5100 const struct nft_data *data = NULL;
5101 int err;
5102
5103 if (!expr->ops->validate)
20a69341
PM		 5104 continue;
5105
0ca743a5
PNA		 5106 err = expr->ops->validate(ctx, expr, &data);
5107 if (err < 0)
5108 return err;
5109
20a69341 5110 if (data == NULL)
0ca743a5 5111 continue;
20a69341 5112
1ca2e170 5113 switch (data->verdict.code) {
20a69341
PM		 5114 case NFT_JUMP:
5115 case NFT_GOTO:
1ca2e170
PM		 5116 err = nf_tables_check_loops(ctx,
5117 data->verdict.chain);
20a69341
PM		 5118 if (err < 0)
5119 return err;
5120 default:
5121 break;
5122 }
5123 }
5124 }
5125
5126 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5127 if (!nft_is_active_next(ctx->net, set))
5128 continue;
20a69341
PM		 5129 if (!(set->flags & NFT_SET_MAP) ||
5130 set->dtype != NFT_DATA_VERDICT)
5131 continue;
5132
5133 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5134 if (!(binding->flags & NFT_SET_MAP) ||
5135 binding->chain != chain)
20a69341
PM		 5136 continue;
5137
8588ac09 5138 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5139 iter.skip = 0;
5140 iter.count = 0;
5141 iter.err = 0;
5142 iter.fn = nf_tables_loop_check_setelem;
5143
5144 set->ops->walk(ctx, set, &iter);
5145 if (iter.err < 0)
5146 return iter.err;
5147 }
5148 }
5149
5150 return 0;
5151}
5152
36b701fa
LGL		 5153/**
5154 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5155 *
5156 * @attr: netlink attribute to fetch value from
5157 * @max: maximum value to be stored in dest
5158 * @dest: pointer to the variable
5159 *
5160 * Parse, check and store a given u32 netlink attribute into variable.
5161 * This function returns -ERANGE if the value goes over maximum value.
5162 * Otherwise a 0 is returned and the attribute value is stored in the
5163 * destination variable.
5164 */
f1d505bb 5165int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5166{
09525a09 5167 u32 val;
36b701fa
LGL		 5168
5169 val = ntohl(nla_get_be32(attr));
5170 if (val > max)
5171 return -ERANGE;
5172
5173 *dest = val;
5174 return 0;
5175}
5176EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5177
49499c3e
PM		 5178/**
5179 * nft_parse_register - parse a register value from a netlink attribute
5180 *
5181 * @attr: netlink attribute
5182 *
5183 * Parse and translate a register value from a netlink attribute.
5184 * Registers used to be 128 bit wide, these register numbers will be
5185 * mapped to the corresponding 32 bit register numbers.
5186 */
b1c96ed3
PM		 5187unsigned int nft_parse_register(const struct nlattr *attr)
5188{
49499c3e
PM		 5189 unsigned int reg;
5190
5191 reg = ntohl(nla_get_be32(attr));
5192 switch (reg) {
5193 case NFT_REG_VERDICT...NFT_REG_4:
5194 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5195 default:
5196 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5197 }
b1c96ed3
PM		 5198}
5199EXPORT_SYMBOL_GPL(nft_parse_register);
5200
49499c3e
PM		 5201/**
5202 * nft_dump_register - dump a register value to a netlink attribute
5203 *
5204 * @skb: socket buffer
5205 * @attr: attribute number
5206 * @reg: register number
5207 *
5208 * Construct a netlink attribute containing the register number. For
5209 * compatibility reasons, register numbers being a multiple of 4 are
5210 * translated to the corresponding 128 bit register numbers.
5211 */
b1c96ed3
PM		 5212int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5213{
49499c3e
PM		 5214 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5215 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5216 else
5217 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5218
b1c96ed3
PM		 5219 return nla_put_be32(skb, attr, htonl(reg));
5220}
5221EXPORT_SYMBOL_GPL(nft_dump_register);
5222
96518518 5223/**
d07db988 5224 * nft_validate_register_load - validate a load from a register
96518518
PM		 5225 *
5226 * @reg: the register number
d07db988 5227 * @len: the length of the data
96518518
PM		 5228 *
5229 * Validate that the input register is one of the general purpose
d07db988 5230 * registers and that the length of the load is within the bounds.
96518518 5231 */
d07db988 5232int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5233{
49499c3e 5234 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5235 return -EINVAL;
d07db988
PM		 5236 if (len == 0)
5237 return -EINVAL;
49499c3e 5238 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5239 return -ERANGE;
49499c3e 5240
96518518
PM		 5241 return 0;
5242}
d07db988 5243EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5244
96518518 5245/**
1ec10212 5246 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5247 *
5248 * @ctx: context of the expression performing the load
5249 * @reg: the destination register number
5250 * @data: the data to load
5251 * @type: the data type
45d9bcda 5252 * @len: the length of the data
96518518
PM		 5253 *
5254 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5255 * the destination register and the length is within the bounds.
5256 * A value of NULL for the data means that its runtime gathered
58f40ab6 5257 * data.
96518518 5258 */
1ec10212
PM		 5259int nft_validate_register_store(const struct nft_ctx *ctx,
5260 enum nft_registers reg,
5261 const struct nft_data *data,
5262 enum nft_data_types type, unsigned int len)
96518518 5263{
20a69341
PM		 5264 int err;
5265
96518518
PM		 5266 switch (reg) {
5267 case NFT_REG_VERDICT:
58f40ab6 5268 if (type != NFT_DATA_VERDICT)
96518518 5269 return -EINVAL;
20a69341 5270
58f40ab6 5271 if (data != NULL &&
1ca2e170
PM		 5272 (data->verdict.code == NFT_GOTO ||
5273 data->verdict.code == NFT_JUMP)) {
5274 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5275 if (err < 0)
5276 return err;
5277
1ca2e170
PM		 5278 if (ctx->chain->level + 1 >
5279 data->verdict.chain->level) {
20a69341
PM		 5280 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5281 return -EMLINK;
1ca2e170 5282 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5283 }
5284 }
5285
96518518
PM		 5286 return 0;
5287 default:
49499c3e 5288 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5289 return -EINVAL;
45d9bcda
PM		 5290 if (len == 0)
5291 return -EINVAL;
49499c3e
PM		 5292 if (reg * NFT_REG32_SIZE + len >
5293 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5294 return -ERANGE;
27e6d201 5295
96518518
PM		 5296 if (data != NULL && type != NFT_DATA_VALUE)
5297 return -EINVAL;
5298 return 0;
5299 }
5300}
1ec10212 5301EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5302
5303static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5304 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5305 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5306 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5307};
5308
5309static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5310 struct nft_data_desc *desc, const struct nlattr *nla)
5311{
664b0f8c 5312 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5313 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5314 struct nft_chain *chain;
5315 int err;
5316
fceb6435
JB		 5317 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5318 NULL);
96518518
PM		 5319 if (err < 0)
5320 return err;
5321
5322 if (!tb[NFTA_VERDICT_CODE])
5323 return -EINVAL;
1ca2e170 5324 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5325
1ca2e170 5326 switch (data->verdict.code) {
e0abdadc 5327 default:
1ca2e170 5328 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5329 case NF_ACCEPT:
5330 case NF_DROP:
5331 case NF_QUEUE:
5332 break;
5333 default:
5334 return -EINVAL;
5335 }
5336 /* fall through */
96518518
PM		 5337 case NFT_CONTINUE:
5338 case NFT_BREAK:
5339 case NFT_RETURN:
96518518
PM		 5340 break;
5341 case NFT_JUMP:
5342 case NFT_GOTO:
5343 if (!tb[NFTA_VERDICT_CHAIN])
5344 return -EINVAL;
5345 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5346 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5347 if (IS_ERR(chain))
5348 return PTR_ERR(chain);
f323d954 5349 if (nft_is_base_chain(chain))
96518518
PM		 5350 return -EOPNOTSUPP;
5351
96518518 5352 chain->use++;
1ca2e170 5353 data->verdict.chain = chain;
96518518 5354 break;
96518518
PM		 5355 }
5356
4c4ed074 5357 desc->len = sizeof(data->verdict);
96518518
PM		 5358 desc->type = NFT_DATA_VERDICT;
5359 return 0;
5360}
5361
5362static void nft_verdict_uninit(const struct nft_data *data)
5363{
1ca2e170 5364 switch (data->verdict.code) {
96518518
PM		 5365 case NFT_JUMP:
5366 case NFT_GOTO:
1ca2e170 5367 data->verdict.chain->use--;
96518518
PM		 5368 break;
5369 }
5370}
5371
33d5a7b1 5372int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5373{
5374 struct nlattr *nest;
5375
33d5a7b1 5376 nest = nla_nest_start(skb, type);
96518518
PM		 5377 if (!nest)
5378 goto nla_put_failure;
5379
33d5a7b1 5380 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5381 goto nla_put_failure;
5382
33d5a7b1 5383 switch (v->code) {
96518518
PM		 5384 case NFT_JUMP:
5385 case NFT_GOTO:
1ca2e170 5386 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5387 v->chain->name))
96518518
PM		 5388 goto nla_put_failure;
5389 }
5390 nla_nest_end(skb, nest);
5391 return 0;
5392
5393nla_put_failure:
5394 return -1;
5395}
5396
d0a11fc3
PM		 5397static int nft_value_init(const struct nft_ctx *ctx,
5398 struct nft_data *data, unsigned int size,
96518518
PM		 5399 struct nft_data_desc *desc, const struct nlattr *nla)
5400{
5401 unsigned int len;
5402
5403 len = nla_len(nla);
5404 if (len == 0)
5405 return -EINVAL;
d0a11fc3 5406 if (len > size)
96518518
PM		 5407 return -EOVERFLOW;
5408
d0a11fc3 5409 nla_memcpy(data->data, nla, len);
96518518
PM		 5410 desc->type = NFT_DATA_VALUE;
5411 desc->len = len;
5412 return 0;
5413}
5414
5415static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5416 unsigned int len)
5417{
5418 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5419}
5420
5421static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5422 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5423 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5424};
5425
5426/**
5427 * nft_data_init - parse nf_tables data netlink attributes
5428 *
5429 * @ctx: context of the expression using the data
5430 * @data: destination struct nft_data
d0a11fc3 5431 * @size: maximum data length
96518518
PM		 5432 * @desc: data description
5433 * @nla: netlink attribute containing data
5434 *
5435 * Parse the netlink data attributes and initialize a struct nft_data.
5436 * The type and length of data are returned in the data description.
5437 *
5438 * The caller can indicate that it only wants to accept data of type
5439 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5440 */
d0a11fc3
PM		 5441int nft_data_init(const struct nft_ctx *ctx,
5442 struct nft_data *data, unsigned int size,
96518518
PM		 5443 struct nft_data_desc *desc, const struct nlattr *nla)
5444{
5445 struct nlattr *tb[NFTA_DATA_MAX + 1];
5446 int err;
5447
fceb6435 5448 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 5449 if (err < 0)
5450 return err;
5451
5452 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5453 return nft_value_init(ctx, data, size, desc,
5454 tb[NFTA_DATA_VALUE]);
96518518
PM		 5455 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5456 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5457 return -EINVAL;
5458}
5459EXPORT_SYMBOL_GPL(nft_data_init);
5460
5461/**
5462 * nft_data_uninit - release a nft_data item
5463 *
5464 * @data: struct nft_data to release
5465 * @type: type of data
5466 *
5467 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5468 * all others need to be released by calling this function.
5469 */
5470void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5471{
960bd2c2 5472 if (type < NFT_DATA_VERDICT)
96518518 5473 return;
960bd2c2 5474 switch (type) {
96518518
PM		 5475 case NFT_DATA_VERDICT:
5476 return nft_verdict_uninit(data);
5477 default:
5478 WARN_ON(1);
5479 }
5480}
5481EXPORT_SYMBOL_GPL(nft_data_uninit);
5482
5483int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5484 enum nft_data_types type, unsigned int len)
5485{
5486 struct nlattr *nest;
5487 int err;
5488
5489 nest = nla_nest_start(skb, attr);
5490 if (nest == NULL)
5491 return -1;
5492
5493 switch (type) {
5494 case NFT_DATA_VALUE:
5495 err = nft_value_dump(skb, data, len);
5496 break;
5497 case NFT_DATA_VERDICT:
33d5a7b1 5498 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5499 break;
5500 default:
5501 err = -EINVAL;
5502 WARN_ON(1);
5503 }
5504
5505 nla_nest_end(skb, nest);
5506 return err;
5507}
5508EXPORT_SYMBOL_GPL(nft_data_dump);
5509
df05ef87 5510static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5511{
5512 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5513 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5514 net->nft.base_seq = 1;
99633ab2
PNA		 5515 return 0;
5516}
5517
5ebe0b0e
PNA		 5518int __nft_release_basechain(struct nft_ctx *ctx)
5519{
5520 struct nft_rule *rule, *nr;
5521
f323d954 5522 BUG_ON(!nft_is_base_chain(ctx->chain));
5ebe0b0e 5523
82bec71d 5524 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 5525 ctx->afi->nops);
5526 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5527 list_del(&rule->list);
5528 ctx->chain->use--;
5529 nf_tables_rule_destroy(ctx, rule);
5530 }
5531 list_del(&ctx->chain->list);
5532 ctx->table->use--;
5533 nf_tables_chain_destroy(ctx->chain);
5534
5535 return 0;
5536}
5537EXPORT_SYMBOL_GPL(__nft_release_basechain);
5538
df05ef87
PNA		 5539/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5540static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5541{
5542 struct nft_table *table, *nt;
5543 struct nft_chain *chain, *nc;
e5009240 5544 struct nft_object *obj, *ne;
df05ef87
PNA		 5545 struct nft_rule *rule, *nr;
5546 struct nft_set *set, *ns;
5547 struct nft_ctx ctx = {
5548 .net = net,
5549 .afi = afi,
5550 };
5551
5552 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5553 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 5554 nf_tables_unregister_hooks(net, table, chain,
5555 afi->nops);
df05ef87
PNA		 5556 /* No packets are walking on these chains anymore. */
5557 ctx.table = table;
5558 list_for_each_entry(chain, &table->chains, list) {
5559 ctx.chain = chain;
5560 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5561 list_del(&rule->list);
5562 chain->use--;
5563 nf_tables_rule_destroy(&ctx, rule);
5564 }
5565 }
5566 list_for_each_entry_safe(set, ns, &table->sets, list) {
5567 list_del(&set->list);
5568 table->use--;
5569 nft_set_destroy(set);
5570 }
e5009240
PNA		 5571 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5572 list_del(&obj->list);
5573 table->use--;
5574 nft_obj_destroy(obj);
5575 }
df05ef87
PNA		 5576 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5577 list_del(&chain->list);
5578 table->use--;
5579 nf_tables_chain_destroy(chain);
5580 }
5581 list_del(&table->list);
5582 nf_tables_table_destroy(&ctx);
5583 }
5584}
5585
99633ab2
PNA		 5586static struct pernet_operations nf_tables_net_ops = {
5587 .init = nf_tables_init_net,
5588};
5589
96518518
PM		 5590static int __init nf_tables_module_init(void)
5591{
5592 int err;
5593
5594 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5595 GFP_KERNEL);
5596 if (info == NULL) {
5597 err = -ENOMEM;
5598 goto err1;
5599 }
5600
5601 err = nf_tables_core_module_init();
5602 if (err < 0)
5603 goto err2;
5604
5605 err = nfnetlink_subsys_register(&nf_tables_subsys);
5606 if (err < 0)
5607 goto err3;
5608
5609 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5610 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5611err3:
5612 nf_tables_core_module_exit();
5613err2:
5614 kfree(info);
5615err1:
5616 return err;
5617}
5618
5619static void __exit nf_tables_module_exit(void)
5620{
99633ab2 5621 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5622 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5623 rcu_barrier();
96518518
PM		 5624 nf_tables_core_module_exit();
5625 kfree(info);
5626}
5627
5628module_init(nf_tables_module_init);
5629module_exit(nf_tables_module_exit);
5630
5631MODULE_LICENSE("GPL");
5632MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5633MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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