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netlink: pass extended ACK struct to parsing functions
[thirdparty/kernel/stable.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 ||
147 !(chain->flags & NFT_BASE_CHAIN))
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
PNA		 159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !(chain->flags & NFT_BASE_CHAIN))
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
441 event |= NFNL_SUBSYS_NFTABLES << 8;
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;
590 if (!(chain->flags & NFT_BASE_CHAIN))
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;
d2012975
PNA		 611 if (!(chain->flags & NFT_BASE_CHAIN))
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
992 event |= NFNL_SUBSYS_NFTABLES << 8;
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
1010 if (chain->flags & NFT_BASE_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
1230 if (chain->flags & NFT_BASE_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
PM		 1367 if (nla[NFTA_CHAIN_POLICY]) {
1368 if ((chain != NULL &&
d6b6cb1d
PNA		 1369 !(chain->flags & NFT_BASE_CHAIN)))
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
1400 if (!(chain->flags & NFT_BASE_CHAIN))
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
PNA		 1436 if (nla[NFTA_CHAIN_COUNTERS]) {
1437 if (!(chain->flags & NFT_BASE_CHAIN))
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
EL		 1888 const struct nft_rule *prule;
1889 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1890
5e948466 1891 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1892 flags);
1893 if (nlh == NULL)
1894 goto nla_put_failure;
1895
1896 nfmsg = nlmsg_data(nlh);
1897 nfmsg->nfgen_family = family;
1898 nfmsg->version = NFNETLINK_V0;
84d7fce6 1899 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1900
1901 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1902 goto nla_put_failure;
1903 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1904 goto nla_put_failure;
b46f6ded
ND		 1905 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1906 NFTA_RULE_PAD))
96518518
PM		 1907 goto nla_put_failure;
1908
5e948466
EL		 1909 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1910 prule = list_entry(rule->list.prev, struct nft_rule, list);
1911 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1912 cpu_to_be64(prule->handle),
1913 NFTA_RULE_PAD))
5e948466
EL		 1914 goto nla_put_failure;
1915 }
1916
96518518
PM		 1917 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1918 if (list == NULL)
1919 goto nla_put_failure;
1920 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1921 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1922 goto nla_put_failure;
96518518
PM		 1923 }
1924 nla_nest_end(skb, list);
1925
86f1ec32
PM		 1926 if (rule->udata) {
1927 struct nft_userdata *udata = nft_userdata(rule);
1928 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1929 udata->data) < 0)
1930 goto nla_put_failure;
1931 }
0768b3b3 1932
053c095a
JB		 1933 nlmsg_end(skb, nlh);
1934 return 0;
96518518
PM		 1935
1936nla_put_failure:
1937 nlmsg_trim(skb, nlh);
1938 return -1;
1939}
1940
25e94a99
PNA		 1941static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1942 const struct nft_rule *rule, int event)
96518518
PM		 1943{
1944 struct sk_buff *skb;
96518518
PM		 1945 int err;
1946
128ad332
PNA		 1947 if (!ctx->report &&
1948 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1949 return;
96518518 1950
96518518
PM		 1951 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1952 if (skb == NULL)
1953 goto err;
1954
84d7fce6
PNA		 1955 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1956 event, 0, ctx->afi->family, ctx->table,
35151d84 1957 ctx->chain, rule);
96518518
PM		 1958 if (err < 0) {
1959 kfree_skb(skb);
1960 goto err;
1961 }
1962
25e94a99
PNA		 1963 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1964 ctx->report, GFP_KERNEL);
1965 return;
96518518 1966err:
25e94a99 1967 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1968}
1969
6e1f760e
PNA		 1970struct nft_rule_dump_ctx {
1971 char table[NFT_TABLE_MAXNAMELEN];
1972 char chain[NFT_CHAIN_MAXNAMELEN];
1973};
1974
96518518
PM		 1975static int nf_tables_dump_rules(struct sk_buff *skb,
1976 struct netlink_callback *cb)
1977{
1978 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 1979 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 1980 const struct nft_af_info *afi;
1981 const struct nft_table *table;
1982 const struct nft_chain *chain;
1983 const struct nft_rule *rule;
1984 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1985 struct net *net = sock_net(skb->sk);
96518518
PM		 1986 int family = nfmsg->nfgen_family;
1987
e688a7f8 1988 rcu_read_lock();
38e029f1
PNA		 1989 cb->seq = net->nft.base_seq;
1990
e688a7f8 1991 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1992 if (family != NFPROTO_UNSPEC && family != afi->family)
1993 continue;
1994
e688a7f8 1995 list_for_each_entry_rcu(table, &afi->tables, list) {
6e1f760e
PNA		 1996 if (ctx && ctx->table[0] &&
1997 strcmp(ctx->table, table->name) != 0)
1998 continue;
1999
e688a7f8 2000 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 2001 if (ctx && ctx->chain[0] &&
2002 strcmp(ctx->chain, chain->name) != 0)
2003 continue;
2004
e688a7f8 2005 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2006 if (!nft_is_active(net, rule))
0628b123 2007 goto cont;
96518518
PM		 2008 if (idx < s_idx)
2009 goto cont;
2010 if (idx > s_idx)
2011 memset(&cb->args[1], 0,
2012 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2013 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2014 cb->nlh->nlmsg_seq,
2015 NFT_MSG_NEWRULE,
2016 NLM_F_MULTI | NLM_F_APPEND,
2017 afi->family, table, chain, rule) < 0)
2018 goto done;
38e029f1
PNA		 2019
2020 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2021cont:
2022 idx++;
2023 }
2024 }
2025 }
2026 }
2027done:
e688a7f8
PNA		 2028 rcu_read_unlock();
2029
96518518
PM		 2030 cb->args[0] = idx;
2031 return skb->len;
2032}
2033
6e1f760e
PNA		 2034static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2035{
2036 kfree(cb->data);
2037 return 0;
2038}
2039
7b8002a1
PNA		 2040static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2041 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2042 const struct nlattr * const nla[])
2043{
2044 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2045 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2046 const struct nft_af_info *afi;
2047 const struct nft_table *table;
2048 const struct nft_chain *chain;
2049 const struct nft_rule *rule;
2050 struct sk_buff *skb2;
2051 int family = nfmsg->nfgen_family;
2052 int err;
2053
2054 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2055 struct netlink_dump_control c = {
2056 .dump = nf_tables_dump_rules,
6e1f760e 2057 .done = nf_tables_dump_rules_done,
96518518 2058 };
6e1f760e
PNA		 2059
2060 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2061 struct nft_rule_dump_ctx *ctx;
2062
2063 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2064 if (!ctx)
2065 return -ENOMEM;
2066
2067 if (nla[NFTA_RULE_TABLE])
2068 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2069 sizeof(ctx->table));
2070 if (nla[NFTA_RULE_CHAIN])
2071 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2072 sizeof(ctx->chain));
2073 c.data = ctx;
2074 }
2075
96518518
PM		 2076 return netlink_dump_start(nlsk, skb, nlh, &c);
2077 }
2078
99633ab2 2079 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2080 if (IS_ERR(afi))
2081 return PTR_ERR(afi);
2082
f2a6d766 2083 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2084 if (IS_ERR(table))
2085 return PTR_ERR(table);
2086
664b0f8c 2087 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2088 if (IS_ERR(chain))
2089 return PTR_ERR(chain);
2090
2091 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2092 if (IS_ERR(rule))
2093 return PTR_ERR(rule);
2094
2095 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2096 if (!skb2)
2097 return -ENOMEM;
2098
84d7fce6 2099 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2100 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2101 family, table, chain, rule);
2102 if (err < 0)
2103 goto err;
2104
2105 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2106
2107err:
2108 kfree_skb(skb2);
2109 return err;
2110}
2111
62472bce
PM		 2112static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2113 struct nft_rule *rule)
96518518 2114{
96518518
PM		 2115 struct nft_expr *expr;
2116
2117 /*
2118 * Careful: some expressions might not be initialized in case this
2119 * is called on error from nf_tables_newrule().
2120 */
2121 expr = nft_expr_first(rule);
3e38df13 2122 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2123 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2124 expr = nft_expr_next(expr);
2125 }
2126 kfree(rule);
2127}
2128
1081d11b
PNA		 2129#define NFT_RULE_MAXEXPRS 128
2130
2131static struct nft_expr_info *info;
2132
633c9a84
PNA		 2133static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2134 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2135 const struct nlattr * const nla[])
2136{
2137 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2138 u8 genmask = nft_genmask_next(net);
7c95f6d8 2139 struct nft_af_info *afi;
96518518
PM		 2140 struct nft_table *table;
2141 struct nft_chain *chain;
2142 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2143 struct nft_userdata *udata;
1081d11b 2144 struct nft_trans *trans = NULL;
96518518
PM		 2145 struct nft_expr *expr;
2146 struct nft_ctx ctx;
2147 struct nlattr *tmp;
86f1ec32 2148 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2149 int err, rem;
2150 bool create;
5e948466 2151 u64 handle, pos_handle;
96518518
PM		 2152
2153 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2154
99633ab2 2155 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2156 if (IS_ERR(afi))
2157 return PTR_ERR(afi);
2158
f2a6d766 2159 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2160 if (IS_ERR(table))
2161 return PTR_ERR(table);
2162
664b0f8c 2163 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2164 if (IS_ERR(chain))
2165 return PTR_ERR(chain);
2166
2167 if (nla[NFTA_RULE_HANDLE]) {
2168 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2169 rule = __nf_tables_rule_lookup(chain, handle);
2170 if (IS_ERR(rule))
2171 return PTR_ERR(rule);
2172
2173 if (nlh->nlmsg_flags & NLM_F_EXCL)
2174 return -EEXIST;
2175 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2176 old_rule = rule;
2177 else
2178 return -EOPNOTSUPP;
2179 } else {
2180 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2181 return -EINVAL;
2182 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2183
2184 if (chain->use == UINT_MAX)
2185 return -EOVERFLOW;
96518518
PM		 2186 }
2187
5e948466
EL		 2188 if (nla[NFTA_RULE_POSITION]) {
2189 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2190 return -EOPNOTSUPP;
2191
2192 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2193 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2194 if (IS_ERR(old_rule))
2195 return PTR_ERR(old_rule);
2196 }
2197
633c9a84 2198 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2199
96518518
PM		 2200 n = 0;
2201 size = 0;
2202 if (nla[NFTA_RULE_EXPRESSIONS]) {
2203 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2204 err = -EINVAL;
2205 if (nla_type(tmp) != NFTA_LIST_ELEM)
2206 goto err1;
2207 if (n == NFT_RULE_MAXEXPRS)
2208 goto err1;
0ca743a5 2209 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2210 if (err < 0)
2211 goto err1;
2212 size += info[n].ops->size;
2213 n++;
2214 }
2215 }
9889840f
PM		 2216 /* Check for overflow of dlen field */
2217 err = -EFBIG;
2218 if (size >= 1 << 12)
2219 goto err1;
96518518 2220
86f1ec32 2221 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2222 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2223 if (ulen > 0)
2224 usize = sizeof(struct nft_userdata) + ulen;
2225 }
0768b3b3 2226
96518518 2227 err = -ENOMEM;
86f1ec32 2228 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2229 if (rule == NULL)
2230 goto err1;
2231
889f7ee7 2232 nft_activate_next(net, rule);
0628b123 2233
96518518
PM		 2234 rule->handle = handle;
2235 rule->dlen = size;
86f1ec32 2236 rule->udata = ulen ? 1 : 0;
0768b3b3 2237
86f1ec32
PM		 2238 if (ulen) {
2239 udata = nft_userdata(rule);
2240 udata->len = ulen - 1;
2241 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2242 }
96518518 2243
96518518
PM		 2244 expr = nft_expr_first(rule);
2245 for (i = 0; i < n; i++) {
2246 err = nf_tables_newexpr(&ctx, &info[i], expr);
2247 if (err < 0)
2248 goto err2;
ef1f7df9 2249 info[i].ops = NULL;
96518518
PM		 2250 expr = nft_expr_next(expr);
2251 }
2252
96518518 2253 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2254 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2255 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2256 old_rule);
1081d11b 2257 if (trans == NULL) {
0628b123
PNA		 2258 err = -ENOMEM;
2259 goto err2;
2260 }
889f7ee7 2261 nft_deactivate_next(net, old_rule);
ac34b861 2262 chain->use--;
5bc5c307 2263 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2264 } else {
2265 err = -ENOENT;
2266 goto err2;
2267 }
96518518 2268 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2269 if (old_rule)
2270 list_add_rcu(&rule->list, &old_rule->list);
2271 else
2272 list_add_tail_rcu(&rule->list, &chain->rules);
2273 else {
2274 if (old_rule)
2275 list_add_tail_rcu(&rule->list, &old_rule->list);
2276 else
2277 list_add_rcu(&rule->list, &chain->rules);
2278 }
96518518 2279
b380e5c7 2280 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2281 err = -ENOMEM;
2282 goto err3;
2283 }
4fefee57 2284 chain->use++;
96518518
PM		 2285 return 0;
2286
0628b123
PNA		 2287err3:
2288 list_del_rcu(&rule->list);
96518518 2289err2:
62472bce 2290 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2291err1:
2292 for (i = 0; i < n; i++) {
2293 if (info[i].ops != NULL)
ef1f7df9 2294 module_put(info[i].ops->type->owner);
96518518
PM		 2295 }
2296 return err;
2297}
2298
1a94e38d
PNA		 2299static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2300 const struct nlattr *nla)
2301{
2302 u32 id = ntohl(nla_get_be32(nla));
2303 struct nft_trans *trans;
2304
2305 list_for_each_entry(trans, &net->nft.commit_list, list) {
2306 struct nft_rule *rule = nft_trans_rule(trans);
2307
2308 if (trans->msg_type == NFT_MSG_NEWRULE &&
2309 id == nft_trans_rule_id(trans))
2310 return rule;
2311 }
2312 return ERR_PTR(-ENOENT);
2313}
2314
633c9a84
PNA		 2315static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2316 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2317 const struct nlattr * const nla[])
2318{
2319 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2320 u8 genmask = nft_genmask_next(net);
7c95f6d8 2321 struct nft_af_info *afi;
7c95f6d8 2322 struct nft_table *table;
cf9dc09d
PNA		 2323 struct nft_chain *chain = NULL;
2324 struct nft_rule *rule;
0628b123
PNA		 2325 int family = nfmsg->nfgen_family, err = 0;
2326 struct nft_ctx ctx;
96518518 2327
99633ab2 2328 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2329 if (IS_ERR(afi))
2330 return PTR_ERR(afi);
2331
f2a6d766 2332 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2333 if (IS_ERR(table))
2334 return PTR_ERR(table);
2335
cf9dc09d 2336 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2337 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2338 genmask);
cf9dc09d
PNA		 2339 if (IS_ERR(chain))
2340 return PTR_ERR(chain);
2341 }
96518518 2342
633c9a84 2343 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2344
cf9dc09d
PNA		 2345 if (chain) {
2346 if (nla[NFTA_RULE_HANDLE]) {
2347 rule = nf_tables_rule_lookup(chain,
2348 nla[NFTA_RULE_HANDLE]);
2349 if (IS_ERR(rule))
2350 return PTR_ERR(rule);
96518518 2351
1a94e38d
PNA		 2352 err = nft_delrule(&ctx, rule);
2353 } else if (nla[NFTA_RULE_ID]) {
2354 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2355 if (IS_ERR(rule))
2356 return PTR_ERR(rule);
2357
5e266fe7 2358 err = nft_delrule(&ctx, rule);
cf9dc09d 2359 } else {
ce24b721 2360 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2361 }
2362 } else {
2363 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2364 if (!nft_is_active_next(net, chain))
2365 continue;
2366
cf9dc09d 2367 ctx.chain = chain;
ce24b721 2368 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2369 if (err < 0)
2370 break;
2371 }
2372 }
2373
2374 return err;
2375}
2376
20a69341
PM		 2377/*
2378 * Sets
2379 */
2380
2381static LIST_HEAD(nf_tables_set_ops);
2382
2383int nft_register_set(struct nft_set_ops *ops)
2384{
2385 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2386 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2387 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2388 return 0;
2389}
2390EXPORT_SYMBOL_GPL(nft_register_set);
2391
2392void nft_unregister_set(struct nft_set_ops *ops)
2393{
2394 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2395 list_del_rcu(&ops->list);
20a69341
PM		 2396 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2397}
2398EXPORT_SYMBOL_GPL(nft_unregister_set);
2399
c50b960c
PM		 2400/*
2401 * Select a set implementation based on the data characteristics and the
2402 * given policy. The total memory use might not be known if no size is
2403 * given, in that case the amount of memory per element is used.
2404 */
2405static const struct nft_set_ops *
2406nft_select_set_ops(const struct nlattr * const nla[],
2407 const struct nft_set_desc *desc,
2408 enum nft_set_policies policy)
20a69341 2409{
c50b960c
PM		 2410 const struct nft_set_ops *ops, *bops;
2411 struct nft_set_estimate est, best;
20a69341
PM		 2412 u32 features;
2413
2414#ifdef CONFIG_MODULES
2415 if (list_empty(&nf_tables_set_ops)) {
2416 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2417 request_module("nft-set");
2418 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2419 if (!list_empty(&nf_tables_set_ops))
2420 return ERR_PTR(-EAGAIN);
2421 }
2422#endif
2423 features = 0;
2424 if (nla[NFTA_SET_FLAGS] != NULL) {
2425 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
7286ff7f
PNA		 2426 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2427 NFT_SET_OBJECT;
20a69341
PM		 2428 }
2429
55af753c
PNA		 2430 bops = NULL;
2431 best.size = ~0;
2432 best.lookup = ~0;
0b5a7874 2433 best.space = ~0;
c50b960c 2434
20a69341
PM		 2435 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2436 if ((ops->features & features) != features)
2437 continue;
c50b960c
PM		 2438 if (!ops->estimate(desc, features, &est))
2439 continue;
2440
2441 switch (policy) {
2442 case NFT_SET_POL_PERFORMANCE:
55af753c 2443 if (est.lookup < best.lookup)
c50b960c 2444 break;
0b5a7874
PNA		 2445 if (est.lookup == best.lookup) {
2446 if (!desc->size) {
2447 if (est.space < best.space)
2448 break;
2449 } else if (est.size < best.size) {
2450 break;
2451 }
2452 }
c50b960c
PM		 2453 continue;
2454 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2455 if (!desc->size) {
2456 if (est.space < best.space)
2457 break;
2458 if (est.space == best.space &&
2459 est.lookup < best.lookup)
2460 break;
2461 } else if (est.size < best.size) {
c50b960c 2462 break;
0b5a7874 2463 }
c50b960c
PM		 2464 continue;
2465 default:
2466 break;
2467 }
2468
20a69341
PM		 2469 if (!try_module_get(ops->owner))
2470 continue;
c50b960c
PM		 2471 if (bops != NULL)
2472 module_put(bops->owner);
2473
2474 bops = ops;
2475 best = est;
20a69341
PM		 2476 }
2477
c50b960c
PM		 2478 if (bops != NULL)
2479 return bops;
2480
20a69341
PM		 2481 return ERR_PTR(-EOPNOTSUPP);
2482}
2483
2484static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2485 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2486 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2487 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2488 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2489 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2490 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2491 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2492 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2493 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2494 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2495 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2496 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2497 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2498 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2499 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2500 .len = NFT_USERDATA_MAXLEN },
8aeff920 2501 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2502};
2503
2504static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2505 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2506};
2507
633c9a84 2508static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2509 const struct sk_buff *skb,
2510 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2511 const struct nlattr * const nla[],
2512 u8 genmask)
20a69341
PM		 2513{
2514 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2515 struct nft_af_info *afi = NULL;
2516 struct nft_table *table = NULL;
20a69341 2517
c9c8e485
PNA		 2518 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2519 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2520 if (IS_ERR(afi))
2521 return PTR_ERR(afi);
2522 }
20a69341
PM		 2523
2524 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2525 if (afi == NULL)
2526 return -EAFNOSUPPORT;
2527
f2a6d766
PNA		 2528 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2529 genmask);
20a69341
PM		 2530 if (IS_ERR(table))
2531 return PTR_ERR(table);
2532 }
2533
633c9a84 2534 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2535 return 0;
2536}
2537
c7a72e3f
PNA		 2538static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2539 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2540{
2541 struct nft_set *set;
2542
2543 if (nla == NULL)
2544 return ERR_PTR(-EINVAL);
2545
2546 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2547 if (!nla_strcmp(nla, set->name) &&
2548 nft_active_genmask(set, genmask))
20a69341
PM		 2549 return set;
2550 }
2551 return ERR_PTR(-ENOENT);
2552}
2553
c7a72e3f
PNA		 2554static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2555 const struct nlattr *nla,
2556 u8 genmask)
958bee14
PNA		 2557{
2558 struct nft_trans *trans;
2559 u32 id = ntohl(nla_get_be32(nla));
2560
2561 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2562 struct nft_set *set = nft_trans_set(trans);
2563
958bee14 2564 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2565 id == nft_trans_set_id(trans) &&
2566 nft_active_genmask(set, genmask))
2567 return set;
958bee14
PNA		 2568 }
2569 return ERR_PTR(-ENOENT);
2570}
c7a72e3f
PNA		 2571
2572struct nft_set *nft_set_lookup(const struct net *net,
2573 const struct nft_table *table,
2574 const struct nlattr *nla_set_name,
2575 const struct nlattr *nla_set_id,
2576 u8 genmask)
2577{
2578 struct nft_set *set;
2579
2580 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2581 if (IS_ERR(set)) {
2582 if (!nla_set_id)
2583 return set;
2584
2585 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2586 }
2587 return set;
2588}
2589EXPORT_SYMBOL_GPL(nft_set_lookup);
958bee14 2590
20a69341
PM		 2591static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2592 const char *name)
2593{
2594 const struct nft_set *i;
2595 const char *p;
2596 unsigned long *inuse;
60eb1894 2597 unsigned int n = 0, min = 0;
20a69341 2598
cb39ad8b 2599 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2600 if (p != NULL) {
2601 if (p[1] != 'd' || strchr(p + 2, '%'))
2602 return -EINVAL;
2603
2604 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2605 if (inuse == NULL)
2606 return -ENOMEM;
60eb1894 2607cont:
20a69341 2608 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2609 int tmp;
2610
37a9cc52
PNA		 2611 if (!nft_is_active_next(ctx->net, set))
2612 continue;
14662917 2613 if (!sscanf(i->name, name, &tmp))
20a69341 2614 continue;
60eb1894 2615 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2616 continue;
14662917 2617
60eb1894 2618 set_bit(tmp - min, inuse);
20a69341
PM		 2619 }
2620
53b70287 2621 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2622 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2623 min += BITS_PER_BYTE * PAGE_SIZE;
2624 memset(inuse, 0, PAGE_SIZE);
2625 goto cont;
2626 }
20a69341
PM		 2627 free_page((unsigned long)inuse);
2628 }
2629
60eb1894 2630 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341 2631 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2632 if (!nft_is_active_next(ctx->net, i))
2633 continue;
20a69341
PM		 2634 if (!strcmp(set->name, i->name))
2635 return -ENFILE;
2636 }
2637 return 0;
2638}
2639
2640static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2641 const struct nft_set *set, u16 event, u16 flags)
2642{
2643 struct nfgenmsg *nfmsg;
2644 struct nlmsghdr *nlh;
c50b960c 2645 struct nlattr *desc;
128ad332
PNA		 2646 u32 portid = ctx->portid;
2647 u32 seq = ctx->seq;
20a69341
PM		 2648
2649 event |= NFNL_SUBSYS_NFTABLES << 8;
2650 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2651 flags);
2652 if (nlh == NULL)
2653 goto nla_put_failure;
2654
2655 nfmsg = nlmsg_data(nlh);
2656 nfmsg->nfgen_family = ctx->afi->family;
2657 nfmsg->version = NFNETLINK_V0;
84d7fce6 2658 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2659
2660 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2661 goto nla_put_failure;
2662 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2663 goto nla_put_failure;
2664 if (set->flags != 0)
2665 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2666 goto nla_put_failure;
2667
2668 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2669 goto nla_put_failure;
2670 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2671 goto nla_put_failure;
2672 if (set->flags & NFT_SET_MAP) {
2673 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2674 goto nla_put_failure;
2675 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2676 goto nla_put_failure;
2677 }
8aeff920
PNA		 2678 if (set->flags & NFT_SET_OBJECT &&
2679 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2680 goto nla_put_failure;
20a69341 2681
761da293 2682 if (set->timeout &&
d3e2a111
AP		 2683 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2684 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2685 NFTA_SET_PAD))
761da293
PM		 2686 goto nla_put_failure;
2687 if (set->gc_int &&
2688 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2689 goto nla_put_failure;
2690
9363dc4b
AB		 2691 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2692 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2693 goto nla_put_failure;
2694 }
2695
e6d8ecac
CFG		 2696 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2697 goto nla_put_failure;
2698
c50b960c
PM		 2699 desc = nla_nest_start(skb, NFTA_SET_DESC);
2700 if (desc == NULL)
2701 goto nla_put_failure;
2702 if (set->size &&
2703 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2704 goto nla_put_failure;
2705 nla_nest_end(skb, desc);
2706
053c095a
JB		 2707 nlmsg_end(skb, nlh);
2708 return 0;
20a69341
PM		 2709
2710nla_put_failure:
2711 nlmsg_trim(skb, nlh);
2712 return -1;
2713}
2714
25e94a99
PNA		 2715static void nf_tables_set_notify(const struct nft_ctx *ctx,
2716 const struct nft_set *set, int event,
2717 gfp_t gfp_flags)
20a69341
PM		 2718{
2719 struct sk_buff *skb;
128ad332 2720 u32 portid = ctx->portid;
20a69341
PM		 2721 int err;
2722
128ad332
PNA		 2723 if (!ctx->report &&
2724 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2725 return;
20a69341 2726
31f8441c 2727 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2728 if (skb == NULL)
2729 goto err;
2730
2731 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2732 if (err < 0) {
2733 kfree_skb(skb);
2734 goto err;
2735 }
2736
25e94a99
PNA		 2737 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2738 gfp_flags);
2739 return;
20a69341 2740err:
25e94a99 2741 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 2742}
2743
5b96af77 2744static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2745{
2746 const struct nft_set *set;
2747 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2748 struct nft_af_info *afi;
c9c8e485
PNA		 2749 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2750 struct net *net = sock_net(skb->sk);
2751 int cur_family = cb->args[3];
5b96af77 2752 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2753
2754 if (cb->args[1])
2755 return skb->len;
2756
e688a7f8 2757 rcu_read_lock();
38e029f1
PNA		 2758 cb->seq = net->nft.base_seq;
2759
e688a7f8 2760 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2761 if (ctx->afi && ctx->afi != afi)
2762 continue;
2763
c9c8e485
PNA		 2764 if (cur_family) {
2765 if (afi->family != cur_family)
2766 continue;
2767
2768 cur_family = 0;
2769 }
e688a7f8 2770 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2771 if (ctx->table && ctx->table != table)
2772 continue;
2773
c9c8e485
PNA		 2774 if (cur_table) {
2775 if (cur_table != table)
2776 continue;
2777
2778 cur_table = NULL;
2779 }
c9c8e485 2780 idx = 0;
5b96af77 2781 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2782 if (idx < s_idx)
2783 goto cont;
37a9cc52
PNA		 2784 if (!nft_is_active(net, set))
2785 goto cont;
5b96af77
PNA		 2786
2787 ctx_set = *ctx;
2788 ctx_set.table = table;
2789 ctx_set.afi = afi;
2790 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2791 NFT_MSG_NEWSET,
2792 NLM_F_MULTI) < 0) {
2793 cb->args[0] = idx;
2794 cb->args[2] = (unsigned long) table;
2795 cb->args[3] = afi->family;
2796 goto done;
2797 }
38e029f1 2798 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2799cont:
2800 idx++;
2801 }
2802 if (s_idx)
2803 s_idx = 0;
2804 }
2805 }
2806 cb->args[1] = 1;
2807done:
e688a7f8 2808 rcu_read_unlock();
c9c8e485
PNA		 2809 return skb->len;
2810}
2811
5b96af77 2812static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2813{
5b96af77
PNA		 2814 kfree(cb->data);
2815 return 0;
20a69341
PM		 2816}
2817
7b8002a1
PNA		 2818static int nf_tables_getset(struct net *net, struct sock *nlsk,
2819 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2820 const struct nlattr * const nla[])
2821{
f2a6d766 2822 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2823 const struct nft_set *set;
2824 struct nft_ctx ctx;
2825 struct sk_buff *skb2;
c9c8e485 2826 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2827 int err;
2828
01cfa0a4 2829 /* Verify existence before starting dump */
f2a6d766 2830 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2831 if (err < 0)
2832 return err;
2833
2834 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2835 struct netlink_dump_control c = {
2836 .dump = nf_tables_dump_sets,
5b96af77 2837 .done = nf_tables_dump_sets_done,
20a69341 2838 };
5b96af77
PNA		 2839 struct nft_ctx *ctx_dump;
2840
2841 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2842 if (ctx_dump == NULL)
2843 return -ENOMEM;
2844
2845 *ctx_dump = ctx;
2846 c.data = ctx_dump;
2847
20a69341
PM		 2848 return netlink_dump_start(nlsk, skb, nlh, &c);
2849 }
2850
c9c8e485
PNA		 2851 /* Only accept unspec with dump */
2852 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2853 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2854 if (!nla[NFTA_SET_TABLE])
2855 return -EINVAL;
c9c8e485 2856
37a9cc52 2857 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2858 if (IS_ERR(set))
2859 return PTR_ERR(set);
2860
2861 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2862 if (skb2 == NULL)
2863 return -ENOMEM;
2864
2865 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2866 if (err < 0)
2867 goto err;
2868
2869 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2870
2871err:
2872 kfree_skb(skb2);
2873 return err;
2874}
2875
c50b960c
PM		 2876static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2877 struct nft_set_desc *desc,
2878 const struct nlattr *nla)
2879{
2880 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2881 int err;
2882
fceb6435
JB		 2883 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2884 nft_set_desc_policy, NULL);
c50b960c
PM		 2885 if (err < 0)
2886 return err;
2887
2888 if (da[NFTA_SET_DESC_SIZE] != NULL)
2889 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2890
2891 return 0;
2892}
2893
633c9a84
PNA		 2894static int nf_tables_newset(struct net *net, struct sock *nlsk,
2895 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2896 const struct nlattr * const nla[])
2897{
2898 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2899 u8 genmask = nft_genmask_next(net);
20a69341 2900 const struct nft_set_ops *ops;
7c95f6d8 2901 struct nft_af_info *afi;
20a69341
PM		 2902 struct nft_table *table;
2903 struct nft_set *set;
2904 struct nft_ctx ctx;
cb39ad8b 2905 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2906 unsigned int size;
2907 bool create;
761da293 2908 u64 timeout;
8aeff920 2909 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 2910 struct nft_set_desc desc;
e6d8ecac
CFG		 2911 unsigned char *udata;
2912 u16 udlen;
20a69341
PM		 2913 int err;
2914
2915 if (nla[NFTA_SET_TABLE] == NULL ||
2916 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2917 nla[NFTA_SET_KEY_LEN] == NULL ||
2918 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2919 return -EINVAL;
2920
c50b960c
PM		 2921 memset(&desc, 0, sizeof(desc));
2922
20a69341
PM		 2923 ktype = NFT_DATA_VALUE;
2924 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2925 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2926 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2927 return -EINVAL;
2928 }
2929
c50b960c 2930 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2931 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2932 return -EINVAL;
2933
2934 flags = 0;
2935 if (nla[NFTA_SET_FLAGS] != NULL) {
2936 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2937 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 2938 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 2939 NFT_SET_MAP | NFT_SET_EVAL |
2940 NFT_SET_OBJECT))
20a69341 2941 return -EINVAL;
8aeff920
PNA		 2942 /* Only one of these operations is supported */
2943 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2944 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 2945 return -EOPNOTSUPP;
20a69341
PM		 2946 }
2947
2948 dtype = 0;
20a69341
PM		 2949 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2950 if (!(flags & NFT_SET_MAP))
2951 return -EINVAL;
2952
2953 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2954 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2955 dtype != NFT_DATA_VERDICT)
2956 return -EINVAL;
2957
2958 if (dtype != NFT_DATA_VERDICT) {
2959 if (nla[NFTA_SET_DATA_LEN] == NULL)
2960 return -EINVAL;
c50b960c 2961 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2962 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2963 return -EINVAL;
2964 } else
7d740264 2965 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2966 } else if (flags & NFT_SET_MAP)
2967 return -EINVAL;
2968
8aeff920
PNA		 2969 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2970 if (!(flags & NFT_SET_OBJECT))
2971 return -EINVAL;
2972
2973 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2974 if (objtype == NFT_OBJECT_UNSPEC ||
2975 objtype > NFT_OBJECT_MAX)
2976 return -EINVAL;
2977 } else if (flags & NFT_SET_OBJECT)
2978 return -EINVAL;
2979 else
2980 objtype = NFT_OBJECT_UNSPEC;
2981
761da293
PM		 2982 timeout = 0;
2983 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2984 if (!(flags & NFT_SET_TIMEOUT))
2985 return -EINVAL;
d3e2a111
AP		 2986 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2987 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 2988 }
2989 gc_int = 0;
2990 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2991 if (!(flags & NFT_SET_TIMEOUT))
2992 return -EINVAL;
2993 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2994 }
2995
c50b960c
PM		 2996 policy = NFT_SET_POL_PERFORMANCE;
2997 if (nla[NFTA_SET_POLICY] != NULL)
2998 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2999
3000 if (nla[NFTA_SET_DESC] != NULL) {
3001 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3002 if (err < 0)
3003 return err;
3004 }
3005
20a69341
PM		 3006 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3007
99633ab2 3008 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 3009 if (IS_ERR(afi))
3010 return PTR_ERR(afi);
3011
f2a6d766 3012 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 3013 if (IS_ERR(table))
3014 return PTR_ERR(table);
3015
633c9a84 3016 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3017
37a9cc52 3018 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3019 if (IS_ERR(set)) {
3020 if (PTR_ERR(set) != -ENOENT)
3021 return PTR_ERR(set);
1a28ad74 3022 } else {
20a69341
PM		 3023 if (nlh->nlmsg_flags & NLM_F_EXCL)
3024 return -EEXIST;
3025 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3026 return -EOPNOTSUPP;
3027 return 0;
3028 }
3029
3030 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3031 return -ENOENT;
3032
c50b960c 3033 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 3034 if (IS_ERR(ops))
3035 return PTR_ERR(ops);
3036
e6d8ecac
CFG		 3037 udlen = 0;
3038 if (nla[NFTA_SET_USERDATA])
3039 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3040
20a69341
PM		 3041 size = 0;
3042 if (ops->privsize != NULL)
3043 size = ops->privsize(nla);
3044
3045 err = -ENOMEM;
e6d8ecac 3046 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 3047 if (set == NULL)
3048 goto err1;
3049
3050 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3051 err = nf_tables_set_alloc_name(&ctx, set, name);
3052 if (err < 0)
3053 goto err2;
3054
e6d8ecac
CFG		 3055 udata = NULL;
3056 if (udlen) {
3057 udata = set->data + size;
3058 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3059 }
3060
20a69341
PM		 3061 INIT_LIST_HEAD(&set->bindings);
3062 set->ops = ops;
3063 set->ktype = ktype;
c50b960c 3064 set->klen = desc.klen;
20a69341 3065 set->dtype = dtype;
8aeff920 3066 set->objtype = objtype;
c50b960c 3067 set->dlen = desc.dlen;
20a69341 3068 set->flags = flags;
c50b960c 3069 set->size = desc.size;
9363dc4b 3070 set->policy = policy;
e6d8ecac
CFG		 3071 set->udlen = udlen;
3072 set->udata = udata;
761da293
PM		 3073 set->timeout = timeout;
3074 set->gc_int = gc_int;
20a69341 3075
c50b960c 3076 err = ops->init(set, &desc, nla);
20a69341
PM		 3077 if (err < 0)
3078 goto err2;
3079
958bee14 3080 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3081 if (err < 0)
c17c3cdf 3082 goto err3;
20a69341 3083
e688a7f8 3084 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3085 table->use++;
20a69341
PM		 3086 return 0;
3087
c17c3cdf
LZ		 3088err3:
3089 ops->destroy(set);
20a69341
PM		 3090err2:
3091 kfree(set);
3092err1:
3093 module_put(ops->owner);
3094 return err;
3095}
3096
958bee14 3097static void nft_set_destroy(struct nft_set *set)
20a69341 3098{
20a69341
PM		 3099 set->ops->destroy(set);
3100 module_put(set->ops->owner);
3101 kfree(set);
3102}
3103
958bee14
PNA		 3104static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3105{
e688a7f8 3106 list_del_rcu(&set->list);
31f8441c 3107 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3108 nft_set_destroy(set);
3109}
3110
633c9a84
PNA		 3111static int nf_tables_delset(struct net *net, struct sock *nlsk,
3112 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3113 const struct nlattr * const nla[])
3114{
c9c8e485 3115 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3116 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3117 struct nft_set *set;
3118 struct nft_ctx ctx;
3119 int err;
3120
ec2c9935
PM		 3121 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3122 return -EAFNOSUPPORT;
20a69341
PM		 3123 if (nla[NFTA_SET_TABLE] == NULL)
3124 return -EINVAL;
3125
f2a6d766 3126 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3127 if (err < 0)
3128 return err;
3129
37a9cc52 3130 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3131 if (IS_ERR(set))
3132 return PTR_ERR(set);
3133 if (!list_empty(&set->bindings))
3134 return -EBUSY;
3135
ee01d542 3136 return nft_delset(&ctx, set);
20a69341
PM		 3137}
3138
3139static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3140 struct nft_set *set,
20a69341 3141 const struct nft_set_iter *iter,
de70185d 3142 struct nft_set_elem *elem)
20a69341 3143{
fe2811eb 3144 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3145 enum nft_registers dreg;
3146
3147 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3148 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3149 set->dtype == NFT_DATA_VERDICT ?
3150 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3151 set->dlen);
20a69341
PM		 3152}
3153
3154int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3155 struct nft_set_binding *binding)
3156{
3157 struct nft_set_binding *i;
3158 struct nft_set_iter iter;
3159
3160 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3161 return -EBUSY;
3162
11113e19 3163 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3164 /* If the set is already bound to the same chain all
3165 * jumps are already validated for that chain.
3166 */
3167 list_for_each_entry(i, &set->bindings, list) {
a4684402 3168 if (i->flags & NFT_SET_MAP &&
11113e19 3169 i->chain == binding->chain)
20a69341
PM		 3170 goto bind;
3171 }
3172
8588ac09 3173 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3174 iter.skip = 0;
3175 iter.count = 0;
3176 iter.err = 0;
3177 iter.fn = nf_tables_bind_check_setelem;
3178
3179 set->ops->walk(ctx, set, &iter);
a02f4248 3180 if (iter.err < 0)
20a69341 3181 return iter.err;
20a69341
PM		 3182 }
3183bind:
3184 binding->chain = ctx->chain;
e688a7f8 3185 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3186 return 0;
3187}
63aea290 3188EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3189
3190void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3191 struct nft_set_binding *binding)
3192{
e688a7f8 3193 list_del_rcu(&binding->list);
20a69341 3194
958bee14 3195 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 3196 nft_is_active(ctx->net, set))
20a69341
PM		 3197 nf_tables_set_destroy(ctx, set);
3198}
63aea290 3199EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3200
3ac4c07a
PM		 3201const struct nft_set_ext_type nft_set_ext_types[] = {
3202 [NFT_SET_EXT_KEY] = {
7d740264 3203 .align = __alignof__(u32),
3ac4c07a
PM		 3204 },
3205 [NFT_SET_EXT_DATA] = {
7d740264 3206 .align = __alignof__(u32),
3ac4c07a 3207 },
f25ad2e9
PM		 3208 [NFT_SET_EXT_EXPR] = {
3209 .align = __alignof__(struct nft_expr),
3210 },
8aeff920
PNA		 3211 [NFT_SET_EXT_OBJREF] = {
3212 .len = sizeof(struct nft_object *),
3213 .align = __alignof__(struct nft_object *),
3214 },
3ac4c07a
PM		 3215 [NFT_SET_EXT_FLAGS] = {
3216 .len = sizeof(u8),
3217 .align = __alignof__(u8),
3218 },
c3e1b005
PM		 3219 [NFT_SET_EXT_TIMEOUT] = {
3220 .len = sizeof(u64),
3221 .align = __alignof__(u64),
3222 },
3223 [NFT_SET_EXT_EXPIRATION] = {
3224 .len = sizeof(unsigned long),
3225 .align = __alignof__(unsigned long),
3226 },
68e942e8
PM		 3227 [NFT_SET_EXT_USERDATA] = {
3228 .len = sizeof(struct nft_userdata),
3229 .align = __alignof__(struct nft_userdata),
3230 },
3ac4c07a
PM		 3231};
3232EXPORT_SYMBOL_GPL(nft_set_ext_types);
3233
20a69341
PM		 3234/*
3235 * Set elements
3236 */
3237
3238static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3239 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3240 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3241 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3242 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3243 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3244 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3245};
3246
3247static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3248 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3249 .len = NFT_TABLE_MAXNAMELEN - 1 },
3250 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3251 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3252 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3253 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3254};
3255
633c9a84 3256static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3257 const struct sk_buff *skb,
3258 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3259 const struct nlattr * const nla[],
3260 u8 genmask)
20a69341
PM		 3261{
3262 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3263 struct nft_af_info *afi;
3264 struct nft_table *table;
20a69341 3265
99633ab2 3266 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3267 if (IS_ERR(afi))
3268 return PTR_ERR(afi);
3269
f2a6d766
PNA		 3270 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3271 genmask);
20a69341
PM		 3272 if (IS_ERR(table))
3273 return PTR_ERR(table);
3274
633c9a84 3275 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3276 return 0;
3277}
3278
3279static int nf_tables_fill_setelem(struct sk_buff *skb,
3280 const struct nft_set *set,
3281 const struct nft_set_elem *elem)
3282{
fe2811eb 3283 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3284 unsigned char *b = skb_tail_pointer(skb);
3285 struct nlattr *nest;
3286
3287 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3288 if (nest == NULL)
3289 goto nla_put_failure;
3290
fe2811eb
PM		 3291 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3292 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3293 goto nla_put_failure;
3294
fe2811eb
PM		 3295 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3296 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3297 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3298 set->dlen) < 0)
3299 goto nla_put_failure;
3300
f25ad2e9
PM		 3301 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3302 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3303 goto nla_put_failure;
3304
8aeff920
PNA		 3305 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3306 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3307 (*nft_set_ext_obj(ext))->name) < 0)
3308 goto nla_put_failure;
3309
fe2811eb
PM		 3310 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3311 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3312 htonl(*nft_set_ext_flags(ext))))
3313 goto nla_put_failure;
20a69341 3314
c3e1b005
PM		 3315 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3316 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3317 cpu_to_be64(jiffies_to_msecs(
3318 *nft_set_ext_timeout(ext))),
b46f6ded 3319 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3320 goto nla_put_failure;
3321
3322 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3323 unsigned long expires, now = jiffies;
3324
3325 expires = *nft_set_ext_expiration(ext);
3326 if (time_before(now, expires))
3327 expires -= now;
3328 else
3329 expires = 0;
3330
3331 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3332 cpu_to_be64(jiffies_to_msecs(expires)),
3333 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3334 goto nla_put_failure;
3335 }
3336
68e942e8
PM		 3337 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3338 struct nft_userdata *udata;
3339
3340 udata = nft_set_ext_userdata(ext);
3341 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3342 udata->len + 1, udata->data))
3343 goto nla_put_failure;
3344 }
3345
20a69341
PM		 3346 nla_nest_end(skb, nest);
3347 return 0;
3348
3349nla_put_failure:
3350 nlmsg_trim(skb, b);
3351 return -EMSGSIZE;
3352}
3353
3354struct nft_set_dump_args {
3355 const struct netlink_callback *cb;
3356 struct nft_set_iter iter;
3357 struct sk_buff *skb;
3358};
3359
3360static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3361 struct nft_set *set,
20a69341 3362 const struct nft_set_iter *iter,
de70185d 3363 struct nft_set_elem *elem)
20a69341
PM		 3364{
3365 struct nft_set_dump_args *args;
3366
3367 args = container_of(iter, struct nft_set_dump_args, iter);
3368 return nf_tables_fill_setelem(args->skb, set, elem);
3369}
3370
3371static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3372{
633c9a84 3373 struct net *net = sock_net(skb->sk);
f2a6d766 3374 u8 genmask = nft_genmask_cur(net);
de70185d 3375 struct nft_set *set;
20a69341
PM		 3376 struct nft_set_dump_args args;
3377 struct nft_ctx ctx;
3378 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3379 struct nfgenmsg *nfmsg;
3380 struct nlmsghdr *nlh;
3381 struct nlattr *nest;
3382 u32 portid, seq;
3383 int event, err;
3384
720e0dfa 3385 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
fceb6435
JB		 3386 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy,
3387 NULL);
20a69341
PM		 3388 if (err < 0)
3389 return err;
3390
633c9a84 3391 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f2a6d766 3392 (void *)nla, genmask);
20a69341
PM		 3393 if (err < 0)
3394 return err;
3395
37a9cc52
PNA		 3396 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3397 genmask);
20a69341
PM		 3398 if (IS_ERR(set))
3399 return PTR_ERR(set);
3400
3401 event = NFT_MSG_NEWSETELEM;
3402 event |= NFNL_SUBSYS_NFTABLES << 8;
3403 portid = NETLINK_CB(cb->skb).portid;
3404 seq = cb->nlh->nlmsg_seq;
3405
3406 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3407 NLM_F_MULTI);
3408 if (nlh == NULL)
3409 goto nla_put_failure;
3410
3411 nfmsg = nlmsg_data(nlh);
6403d962 3412 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3413 nfmsg->version = NFNETLINK_V0;
84d7fce6 3414 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3415
3416 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3417 goto nla_put_failure;
3418 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3419 goto nla_put_failure;
3420
3421 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3422 if (nest == NULL)
3423 goto nla_put_failure;
3424
8588ac09
PNA		 3425 args.cb = cb;
3426 args.skb = skb;
3427 args.iter.genmask = nft_genmask_cur(ctx.net);
3428 args.iter.skip = cb->args[0];
3429 args.iter.count = 0;
3430 args.iter.err = 0;
3431 args.iter.fn = nf_tables_dump_setelem;
20a69341
PM		 3432 set->ops->walk(&ctx, set, &args.iter);
3433
3434 nla_nest_end(skb, nest);
3435 nlmsg_end(skb, nlh);
3436
3437 if (args.iter.err && args.iter.err != -EMSGSIZE)
3438 return args.iter.err;
3439 if (args.iter.count == cb->args[0])
3440 return 0;
3441
3442 cb->args[0] = args.iter.count;
3443 return skb->len;
3444
3445nla_put_failure:
3446 return -ENOSPC;
3447}
3448
7b8002a1
PNA		 3449static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3450 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3451 const struct nlattr * const nla[])
3452{
f2a6d766 3453 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3454 const struct nft_set *set;
3455 struct nft_ctx ctx;
3456 int err;
3457
f2a6d766 3458 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3459 if (err < 0)
3460 return err;
3461
37a9cc52
PNA		 3462 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3463 genmask);
20a69341
PM		 3464 if (IS_ERR(set))
3465 return PTR_ERR(set);
3466
3467 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3468 struct netlink_dump_control c = {
3469 .dump = nf_tables_dump_set,
3470 };
3471 return netlink_dump_start(nlsk, skb, nlh, &c);
3472 }
3473 return -EOPNOTSUPP;
3474}
3475
d60ce62f
AB		 3476static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3477 const struct nft_ctx *ctx, u32 seq,
3478 u32 portid, int event, u16 flags,
3479 const struct nft_set *set,
3480 const struct nft_set_elem *elem)
3481{
3482 struct nfgenmsg *nfmsg;
3483 struct nlmsghdr *nlh;
3484 struct nlattr *nest;
3485 int err;
3486
3487 event |= NFNL_SUBSYS_NFTABLES << 8;
3488 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3489 flags);
3490 if (nlh == NULL)
3491 goto nla_put_failure;
3492
3493 nfmsg = nlmsg_data(nlh);
3494 nfmsg->nfgen_family = ctx->afi->family;
3495 nfmsg->version = NFNETLINK_V0;
84d7fce6 3496 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3497
3498 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3499 goto nla_put_failure;
3500 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3501 goto nla_put_failure;
3502
3503 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3504 if (nest == NULL)
3505 goto nla_put_failure;
3506
3507 err = nf_tables_fill_setelem(skb, set, elem);
3508 if (err < 0)
3509 goto nla_put_failure;
3510
3511 nla_nest_end(skb, nest);
3512
053c095a
JB		 3513 nlmsg_end(skb, nlh);
3514 return 0;
d60ce62f
AB		 3515
3516nla_put_failure:
3517 nlmsg_trim(skb, nlh);
3518 return -1;
3519}
3520
25e94a99
PNA		 3521static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3522 const struct nft_set *set,
3523 const struct nft_set_elem *elem,
3524 int event, u16 flags)
d60ce62f 3525{
128ad332
PNA		 3526 struct net *net = ctx->net;
3527 u32 portid = ctx->portid;
d60ce62f
AB		 3528 struct sk_buff *skb;
3529 int err;
3530
128ad332 3531 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 3532 return;
d60ce62f 3533
d60ce62f
AB		 3534 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3535 if (skb == NULL)
3536 goto err;
3537
3538 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3539 set, elem);
3540 if (err < 0) {
3541 kfree_skb(skb);
3542 goto err;
3543 }
3544
25e94a99
PNA		 3545 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3546 GFP_KERNEL);
3547 return;
d60ce62f 3548err:
25e94a99 3549 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 3550}
3551
60319eb1
PNA		 3552static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3553 int msg_type,
3554 struct nft_set *set)
3555{
3556 struct nft_trans *trans;
3557
3558 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3559 if (trans == NULL)
3560 return NULL;
3561
3562 nft_trans_elem_set(trans) = set;
3563 return trans;
3564}
3565
22fe54d5
PM		 3566void *nft_set_elem_init(const struct nft_set *set,
3567 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3568 const u32 *key, const u32 *data,
22fe54d5 3569 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3570{
3571 struct nft_set_ext *ext;
3572 void *elem;
3573
3574 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3575 if (elem == NULL)
3576 return NULL;
3577
3578 ext = nft_set_elem_ext(set, elem);
3579 nft_set_ext_init(ext, tmpl);
3580
3581 memcpy(nft_set_ext_key(ext), key, set->klen);
3582 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3583 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3584 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3585 *nft_set_ext_expiration(ext) =
d3e2a111 3586 jiffies + timeout;
c3e1b005
PM		 3587 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3588 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3589
3590 return elem;
3591}
3592
61f9e292
LZ		 3593void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3594 bool destroy_expr)
61edafbb
PM		 3595{
3596 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3597
3598 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3599 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3600 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
61f9e292 3601 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3602 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3603 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3604 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3605 kfree(elem);
3606}
3607EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3608
0e9091d6
PNA		 3609static int nft_setelem_parse_flags(const struct nft_set *set,
3610 const struct nlattr *attr, u32 *flags)
3611{
3612 if (attr == NULL)
3613 return 0;
3614
3615 *flags = ntohl(nla_get_be32(attr));
3616 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3617 return -EINVAL;
3618 if (!(set->flags & NFT_SET_INTERVAL) &&
3619 *flags & NFT_SET_ELEM_INTERVAL_END)
3620 return -EINVAL;
3621
3622 return 0;
3623}
3624
60319eb1 3625static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3626 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3627{
3628 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3629 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3630 struct nft_data_desc d1, d2;
fe2811eb 3631 struct nft_set_ext_tmpl tmpl;
c016c7e4 3632 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3633 struct nft_set_elem elem;
3634 struct nft_set_binding *binding;
8aeff920 3635 struct nft_object *obj = NULL;
68e942e8 3636 struct nft_userdata *udata;
fe2811eb 3637 struct nft_data data;
20a69341 3638 enum nft_registers dreg;
60319eb1 3639 struct nft_trans *trans;
0e9091d6 3640 u32 flags = 0;
c3e1b005 3641 u64 timeout;
68e942e8 3642 u8 ulen;
20a69341
PM		 3643 int err;
3644
3645 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3646 nft_set_elem_policy, NULL);
20a69341
PM		 3647 if (err < 0)
3648 return err;
3649
3650 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3651 return -EINVAL;
3652
fe2811eb
PM		 3653 nft_set_ext_prepare(&tmpl);
3654
0e9091d6
PNA		 3655 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3656 if (err < 0)
3657 return err;
3658 if (flags != 0)
3659 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3660
3661 if (set->flags & NFT_SET_MAP) {
3662 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3663 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3664 return -EINVAL;
bd7fc645 3665 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3666 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3667 return -EINVAL;
20a69341
PM		 3668 } else {
3669 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3670 return -EINVAL;
3671 }
3672
c3e1b005
PM		 3673 timeout = 0;
3674 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3675 if (!(set->flags & NFT_SET_TIMEOUT))
3676 return -EINVAL;
d3e2a111
AP		 3677 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3678 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3679 } else if (set->flags & NFT_SET_TIMEOUT) {
3680 timeout = set->timeout;
3681 }
3682
7d740264 3683 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3684 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3685 if (err < 0)
3686 goto err1;
3687 err = -EINVAL;
3688 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3689 goto err2;
3690
7d740264 3691 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3692 if (timeout > 0) {
3693 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3694 if (timeout != set->timeout)
3695 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3696 }
fe2811eb 3697
8aeff920
PNA		 3698 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3699 if (!(set->flags & NFT_SET_OBJECT)) {
3700 err = -EINVAL;
3701 goto err2;
3702 }
3703 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3704 set->objtype, genmask);
3705 if (IS_ERR(obj)) {
3706 err = PTR_ERR(obj);
3707 goto err2;
3708 }
3709 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3710 }
3711
20a69341 3712 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3713 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3714 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3715 if (err < 0)
3716 goto err2;
3717
3718 err = -EINVAL;
3719 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3720 goto err3;
3721
3722 dreg = nft_type_to_reg(set->dtype);
3723 list_for_each_entry(binding, &set->bindings, list) {
3724 struct nft_ctx bind_ctx = {
58c78e10 3725 .net = ctx->net,
20a69341
PM		 3726 .afi = ctx->afi,
3727 .table = ctx->table,
7c95f6d8 3728 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3729 };
3730
11113e19
PM		 3731 if (!(binding->flags & NFT_SET_MAP))
3732 continue;
3733
1ec10212
PM		 3734 err = nft_validate_register_store(&bind_ctx, dreg,
3735 &data,
3736 d2.type, d2.len);
20a69341
PM		 3737 if (err < 0)
3738 goto err3;
3739 }
fe2811eb 3740
7d740264 3741 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3742 }
3743
68e942e8
PM		 3744 /* The full maximum length of userdata can exceed the maximum
3745 * offset value (U8_MAX) for following extensions, therefor it
3746 * must be the last extension added.
3747 */
3748 ulen = 0;
3749 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3750 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3751 if (ulen > 0)
3752 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3753 ulen);
3754 }
3755
fe2811eb 3756 err = -ENOMEM;
7d740264 3757 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3758 timeout, GFP_KERNEL);
fe2811eb
PM		 3759 if (elem.priv == NULL)
3760 goto err3;
3761
3762 ext = nft_set_elem_ext(set, elem.priv);
3763 if (flags)
3764 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3765 if (ulen > 0) {
3766 udata = nft_set_ext_userdata(ext);
3767 udata->len = ulen - 1;
3768 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3769 }
8aeff920
PNA		 3770 if (obj) {
3771 *nft_set_ext_obj(ext) = obj;
3772 obj->use++;
3773 }
fe2811eb 3774
60319eb1
PNA		 3775 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3776 if (trans == NULL)
fe2811eb 3777 goto err4;
60319eb1 3778
69086658 3779 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 3780 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3781 if (err) {
3782 if (err == -EEXIST) {
8aeff920
PNA		 3783 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3784 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3785 memcmp(nft_set_ext_data(ext),
3786 nft_set_ext_data(ext2), set->dlen) != 0) ||
3787 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3788 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3789 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 3790 err = -EBUSY;
3791 else if (!(nlmsg_flags & NLM_F_EXCL))
3792 err = 0;
3793 }
fe2811eb 3794 goto err5;
c016c7e4 3795 }
20a69341 3796
35d0ac90
PNA		 3797 if (set->size &&
3798 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3799 err = -ENFILE;
3800 goto err6;
3801 }
3802
60319eb1 3803 nft_trans_elem(trans) = elem;
46bbafce 3804 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3805 return 0;
3806
35d0ac90 3807err6:
5cb82a38 3808 set->ops->remove(ctx->net, set, &elem);
fe2811eb 3809err5:
60319eb1 3810 kfree(trans);
fe2811eb
PM		 3811err4:
3812 kfree(elem.priv);
20a69341
PM		 3813err3:
3814 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3815 nft_data_uninit(&data, d2.type);
20a69341 3816err2:
7d740264 3817 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3818err1:
3819 return err;
3820}
3821
633c9a84
PNA		 3822static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3823 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3824 const struct nlattr * const nla[])
3825{
f2a6d766 3826 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3827 const struct nlattr *attr;
3828 struct nft_set *set;
3829 struct nft_ctx ctx;
60319eb1 3830 int rem, err = 0;
20a69341 3831
7d5570ca
PNA		 3832 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3833 return -EINVAL;
3834
f2a6d766 3835 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3836 if (err < 0)
3837 return err;
3838
37a9cc52
PNA		 3839 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3840 genmask);
958bee14
PNA		 3841 if (IS_ERR(set)) {
3842 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3843 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3844 nla[NFTA_SET_ELEM_LIST_SET_ID],
3845 genmask);
958bee14
PNA		 3846 }
3847 if (IS_ERR(set))
3848 return PTR_ERR(set);
3849 }
3850
20a69341
PM		 3851 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3852 return -EBUSY;
3853
3854 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 3855 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 3856 if (err < 0)
60319eb1 3857 break;
20a69341 3858 }
60319eb1 3859 return err;
20a69341
PM		 3860}
3861
60319eb1 3862static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3863 const struct nlattr *attr)
3864{
3865 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3866 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3867 struct nft_data_desc desc;
3868 struct nft_set_elem elem;
3971ca14 3869 struct nft_set_ext *ext;
60319eb1 3870 struct nft_trans *trans;
3971ca14
PNA		 3871 u32 flags = 0;
3872 void *priv;
20a69341
PM		 3873 int err;
3874
3875 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3876 nft_set_elem_policy, NULL);
20a69341
PM		 3877 if (err < 0)
3878 goto err1;
3879
3880 err = -EINVAL;
3881 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3882 goto err1;
3883
3971ca14
PNA		 3884 nft_set_ext_prepare(&tmpl);
3885
3886 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3887 if (err < 0)
3888 return err;
3889 if (flags != 0)
3890 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3891
7d740264 3892 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3893 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3894 if (err < 0)
3895 goto err1;
3896
3897 err = -EINVAL;
3898 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3899 goto err2;
3900
3971ca14
PNA		 3901 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3902
3903 err = -ENOMEM;
3904 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3905 GFP_KERNEL);
3906 if (elem.priv == NULL)
3907 goto err2;
3908
3909 ext = nft_set_elem_ext(set, elem.priv);
3910 if (flags)
3911 *nft_set_ext_flags(ext) = flags;
3912
60319eb1 3913 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3914 if (trans == NULL) {
3915 err = -ENOMEM;
3971ca14 3916 goto err3;
609ccf08 3917 }
20a69341 3918
42a55769 3919 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 3920 if (priv == NULL) {
cc02e457 3921 err = -ENOENT;
3971ca14 3922 goto err4;
cc02e457 3923 }
3971ca14
PNA		 3924 kfree(elem.priv);
3925 elem.priv = priv;
cc02e457 3926
60319eb1 3927 nft_trans_elem(trans) = elem;
46bbafce 3928 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3929 return 0;
cc02e457 3930
3971ca14 3931err4:
cc02e457 3932 kfree(trans);
3971ca14
PNA		 3933err3:
3934 kfree(elem.priv);
20a69341 3935err2:
7d740264 3936 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3937err1:
3938 return err;
3939}
3940
8411b644 3941static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 3942 struct nft_set *set,
8411b644 3943 const struct nft_set_iter *iter,
de70185d 3944 struct nft_set_elem *elem)
8411b644
PNA		 3945{
3946 struct nft_trans *trans;
3947 int err;
3948
3949 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3950 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3951 if (!trans)
3952 return -ENOMEM;
3953
1ba1c414 3954 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 3955 err = -ENOENT;
3956 goto err1;
3957 }
b2c11e4b 3958 set->ndeact++;
8411b644 3959
de70185d
PNA		 3960 nft_trans_elem_set(trans) = set;
3961 nft_trans_elem(trans) = *elem;
8411b644
PNA		 3962 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3963
3964 return 0;
3965err1:
3966 kfree(trans);
3967 return err;
3968}
3969
633c9a84
PNA		 3970static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3971 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3972 const struct nlattr * const nla[])
3973{
f2a6d766 3974 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3975 const struct nlattr *attr;
3976 struct nft_set *set;
3977 struct nft_ctx ctx;
60319eb1 3978 int rem, err = 0;
20a69341 3979
f2a6d766 3980 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3981 if (err < 0)
3982 return err;
3983
37a9cc52
PNA		 3984 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3985 genmask);
20a69341
PM		 3986 if (IS_ERR(set))
3987 return PTR_ERR(set);
3988 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3989 return -EBUSY;
3990
8411b644 3991 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 3992 struct nft_set_iter iter = {
3993 .genmask = genmask,
3994 .fn = nft_flush_set,
8411b644 3995 };
baa2d42c 3996 set->ops->walk(&ctx, set, &iter);
8411b644 3997
baa2d42c 3998 return iter.err;
8411b644
PNA		 3999 }
4000
20a69341
PM		 4001 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4002 err = nft_del_setelem(&ctx, set, attr);
4003 if (err < 0)
60319eb1 4004 break;
4fefee57 4005
3dd0673a 4006 set->ndeact++;
20a69341 4007 }
60319eb1 4008 return err;
20a69341
PM		 4009}
4010
cfed7e1b
PM		 4011void nft_set_gc_batch_release(struct rcu_head *rcu)
4012{
4013 struct nft_set_gc_batch *gcb;
4014 unsigned int i;
4015
4016 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4017 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4018 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4019 kfree(gcb);
4020}
4021EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4022
4023struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4024 gfp_t gfp)
4025{
4026 struct nft_set_gc_batch *gcb;
4027
4028 gcb = kzalloc(sizeof(*gcb), gfp);
4029 if (gcb == NULL)
4030 return gcb;
4031 gcb->head.set = set;
4032 return gcb;
4033}
4034EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4035
e5009240
PNA		 4036/*
4037 * Stateful objects
4038 */
4039
4040/**
4041 * nft_register_obj- register nf_tables stateful object type
4042 * @obj: object type
4043 *
4044 * Registers the object type for use with nf_tables. Returns zero on
4045 * success or a negative errno code otherwise.
4046 */
4047int nft_register_obj(struct nft_object_type *obj_type)
4048{
4049 if (obj_type->type == NFT_OBJECT_UNSPEC)
4050 return -EINVAL;
4051
4052 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4053 list_add_rcu(&obj_type->list, &nf_tables_objects);
4054 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4055 return 0;
4056}
4057EXPORT_SYMBOL_GPL(nft_register_obj);
4058
4059/**
4060 * nft_unregister_obj - unregister nf_tables object type
4061 * @obj: object type
4062 *
4063 * Unregisters the object type for use with nf_tables.
4064 */
4065void nft_unregister_obj(struct nft_object_type *obj_type)
4066{
4067 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4068 list_del_rcu(&obj_type->list);
4069 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4070}
4071EXPORT_SYMBOL_GPL(nft_unregister_obj);
4072
4073struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4074 const struct nlattr *nla,
4075 u32 objtype, u8 genmask)
4076{
4077 struct nft_object *obj;
4078
4079 list_for_each_entry(obj, &table->objects, list) {
4080 if (!nla_strcmp(nla, obj->name) &&
4081 objtype == obj->type->type &&
4082 nft_active_genmask(obj, genmask))
4083 return obj;
4084 }
4085 return ERR_PTR(-ENOENT);
4086}
4087EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4088
4089static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4090 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4091 .len = NFT_TABLE_MAXNAMELEN - 1 },
4092 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4093 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4094 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4095 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4096};
4097
84fba055
FW		 4098static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4099 const struct nft_object_type *type,
e5009240
PNA		 4100 const struct nlattr *attr)
4101{
4102 struct nlattr *tb[type->maxattr + 1];
4103 struct nft_object *obj;
4104 int err;
4105
4106 if (attr) {
fceb6435
JB		 4107 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4108 NULL);
e5009240
PNA		 4109 if (err < 0)
4110 goto err1;
4111 } else {
4112 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4113 }
4114
4115 err = -ENOMEM;
4116 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4117 if (obj == NULL)
4118 goto err1;
4119
84fba055 4120 err = type->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240
PNA		 4121 if (err < 0)
4122 goto err2;
4123
4124 obj->type = type;
4125 return obj;
4126err2:
4127 kfree(obj);
4128err1:
4129 return ERR_PTR(err);
4130}
4131
4132static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4133 struct nft_object *obj, bool reset)
e5009240
PNA		 4134{
4135 struct nlattr *nest;
4136
4137 nest = nla_nest_start(skb, attr);
4138 if (!nest)
4139 goto nla_put_failure;
43da04a5 4140 if (obj->type->dump(skb, obj, reset) < 0)
e5009240
PNA		 4141 goto nla_put_failure;
4142 nla_nest_end(skb, nest);
4143 return 0;
4144
4145nla_put_failure:
4146 return -1;
4147}
4148
4149static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4150{
4151 const struct nft_object_type *type;
4152
4153 list_for_each_entry(type, &nf_tables_objects, list) {
4154 if (objtype == type->type)
4155 return type;
4156 }
4157 return NULL;
4158}
4159
4160static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4161{
4162 const struct nft_object_type *type;
4163
4164 type = __nft_obj_type_get(objtype);
4165 if (type != NULL && try_module_get(type->owner))
4166 return type;
4167
4168#ifdef CONFIG_MODULES
4169 if (type == NULL) {
4170 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4171 request_module("nft-obj-%u", objtype);
4172 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4173 if (__nft_obj_type_get(objtype))
4174 return ERR_PTR(-EAGAIN);
4175 }
4176#endif
4177 return ERR_PTR(-ENOENT);
4178}
4179
4180static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4181 struct sk_buff *skb, const struct nlmsghdr *nlh,
4182 const struct nlattr * const nla[])
4183{
4184 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4185 const struct nft_object_type *type;
4186 u8 genmask = nft_genmask_next(net);
4187 int family = nfmsg->nfgen_family;
4188 struct nft_af_info *afi;
4189 struct nft_table *table;
4190 struct nft_object *obj;
4191 struct nft_ctx ctx;
4192 u32 objtype;
4193 int err;
4194
4195 if (!nla[NFTA_OBJ_TYPE] ||
4196 !nla[NFTA_OBJ_NAME] ||
4197 !nla[NFTA_OBJ_DATA])
4198 return -EINVAL;
4199
4200 afi = nf_tables_afinfo_lookup(net, family, true);
4201 if (IS_ERR(afi))
4202 return PTR_ERR(afi);
4203
4204 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4205 if (IS_ERR(table))
4206 return PTR_ERR(table);
4207
4208 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4209 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4210 if (IS_ERR(obj)) {
4211 err = PTR_ERR(obj);
4212 if (err != -ENOENT)
4213 return err;
4214
1a28ad74 4215 } else {
e5009240
PNA		 4216 if (nlh->nlmsg_flags & NLM_F_EXCL)
4217 return -EEXIST;
4218
4219 return 0;
4220 }
4221
4222 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4223
4224 type = nft_obj_type_get(objtype);
4225 if (IS_ERR(type))
4226 return PTR_ERR(type);
4227
84fba055 4228 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4229 if (IS_ERR(obj)) {
4230 err = PTR_ERR(obj);
4231 goto err1;
4232 }
18965317 4233 obj->table = table;
e5009240
PNA		 4234 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4235
4236 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4237 if (err < 0)
4238 goto err2;
4239
4240 list_add_tail_rcu(&obj->list, &table->objects);
4241 table->use++;
4242 return 0;
4243err2:
4244 if (obj->type->destroy)
4245 obj->type->destroy(obj);
4246 kfree(obj);
4247err1:
4248 module_put(type->owner);
4249 return err;
4250}
4251
4252static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4253 u32 portid, u32 seq, int event, u32 flags,
4254 int family, const struct nft_table *table,
43da04a5 4255 struct nft_object *obj, bool reset)
e5009240
PNA		 4256{
4257 struct nfgenmsg *nfmsg;
4258 struct nlmsghdr *nlh;
4259
4260 event |= NFNL_SUBSYS_NFTABLES << 8;
4261 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4262 if (nlh == NULL)
4263 goto nla_put_failure;
4264
4265 nfmsg = nlmsg_data(nlh);
4266 nfmsg->nfgen_family = family;
4267 nfmsg->version = NFNETLINK_V0;
4268 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4269
4270 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4271 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4272 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4273 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4274 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4275 goto nla_put_failure;
4276
4277 nlmsg_end(skb, nlh);
4278 return 0;
4279
4280nla_put_failure:
4281 nlmsg_trim(skb, nlh);
4282 return -1;
4283}
4284
a9fea2a3
PNA		 4285struct nft_obj_filter {
4286 char table[NFT_OBJ_MAXNAMELEN];
4287 u32 type;
4288};
4289
e5009240
PNA		 4290static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4291{
4292 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4293 const struct nft_af_info *afi;
4294 const struct nft_table *table;
e5009240 4295 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4296 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4297 struct net *net = sock_net(skb->sk);
4298 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4299 struct nft_object *obj;
4300 bool reset = false;
4301
4302 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4303 reset = true;
e5009240
PNA		 4304
4305 rcu_read_lock();
4306 cb->seq = net->nft.base_seq;
4307
4308 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4309 if (family != NFPROTO_UNSPEC && family != afi->family)
4310 continue;
4311
4312 list_for_each_entry_rcu(table, &afi->tables, list) {
4313 list_for_each_entry_rcu(obj, &table->objects, list) {
4314 if (!nft_is_active(net, obj))
4315 goto cont;
4316 if (idx < s_idx)
4317 goto cont;
4318 if (idx > s_idx)
4319 memset(&cb->args[1], 0,
4320 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4321 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4322 strcmp(filter->table, table->name))
4323 goto cont;
d21e540b
LZ		 4324 if (filter &&
4325 filter->type != NFT_OBJECT_UNSPEC &&
a9fea2a3
PNA		 4326 obj->type->type != filter->type)
4327 goto cont;
4328
e5009240
PNA		 4329 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4330 cb->nlh->nlmsg_seq,
4331 NFT_MSG_NEWOBJ,
4332 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4333 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4334 goto done;
4335
4336 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4337cont:
4338 idx++;
4339 }
4340 }
4341 }
4342done:
4343 rcu_read_unlock();
4344
4345 cb->args[0] = idx;
4346 return skb->len;
4347}
4348
a9fea2a3
PNA		 4349static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4350{
4351 kfree(cb->data);
4352
4353 return 0;
4354}
4355
4356static struct nft_obj_filter *
4357nft_obj_filter_alloc(const struct nlattr * const nla[])
4358{
4359 struct nft_obj_filter *filter;
4360
4361 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4362 if (!filter)
4363 return ERR_PTR(-ENOMEM);
4364
4365 if (nla[NFTA_OBJ_TABLE])
4366 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4367 NFT_TABLE_MAXNAMELEN);
4368 if (nla[NFTA_OBJ_TYPE])
4369 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4370
4371 return filter;
4372}
4373
e5009240
PNA		 4374static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4375 struct sk_buff *skb, const struct nlmsghdr *nlh,
4376 const struct nlattr * const nla[])
4377{
4378 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4379 u8 genmask = nft_genmask_cur(net);
4380 int family = nfmsg->nfgen_family;
4381 const struct nft_af_info *afi;
4382 const struct nft_table *table;
4383 struct nft_object *obj;
4384 struct sk_buff *skb2;
43da04a5 4385 bool reset = false;
e5009240
PNA		 4386 u32 objtype;
4387 int err;
4388
4389 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4390 struct netlink_dump_control c = {
4391 .dump = nf_tables_dump_obj,
a9fea2a3 4392 .done = nf_tables_dump_obj_done,
e5009240 4393 };
a9fea2a3
PNA		 4394
4395 if (nla[NFTA_OBJ_TABLE] ||
4396 nla[NFTA_OBJ_TYPE]) {
4397 struct nft_obj_filter *filter;
4398
4399 filter = nft_obj_filter_alloc(nla);
4400 if (IS_ERR(filter))
4401 return -ENOMEM;
4402
4403 c.data = filter;
4404 }
e5009240
PNA		 4405 return netlink_dump_start(nlsk, skb, nlh, &c);
4406 }
4407
4408 if (!nla[NFTA_OBJ_NAME] ||
4409 !nla[NFTA_OBJ_TYPE])
4410 return -EINVAL;
4411
4412 afi = nf_tables_afinfo_lookup(net, family, false);
4413 if (IS_ERR(afi))
4414 return PTR_ERR(afi);
4415
4416 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4417 if (IS_ERR(table))
4418 return PTR_ERR(table);
4419
4420 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4421 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4422 if (IS_ERR(obj))
4423 return PTR_ERR(obj);
4424
4425 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4426 if (!skb2)
4427 return -ENOMEM;
4428
43da04a5
PNA		 4429 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4430 reset = true;
4431
e5009240
PNA		 4432 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4433 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4434 family, table, obj, reset);
e5009240
PNA		 4435 if (err < 0)
4436 goto err;
4437
4438 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4439err:
4440 kfree_skb(skb2);
4441 return err;
4442
4443 return 0;
4444}
4445
4446static void nft_obj_destroy(struct nft_object *obj)
4447{
4448 if (obj->type->destroy)
4449 obj->type->destroy(obj);
4450
4451 module_put(obj->type->owner);
4452 kfree(obj);
4453}
4454
4455static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4456 struct sk_buff *skb, const struct nlmsghdr *nlh,
4457 const struct nlattr * const nla[])
4458{
4459 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4460 u8 genmask = nft_genmask_next(net);
4461 int family = nfmsg->nfgen_family;
4462 struct nft_af_info *afi;
4463 struct nft_table *table;
4464 struct nft_object *obj;
4465 struct nft_ctx ctx;
4466 u32 objtype;
4467
4468 if (!nla[NFTA_OBJ_TYPE] ||
4469 !nla[NFTA_OBJ_NAME])
4470 return -EINVAL;
4471
4472 afi = nf_tables_afinfo_lookup(net, family, true);
4473 if (IS_ERR(afi))
4474 return PTR_ERR(afi);
4475
4476 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4477 if (IS_ERR(table))
4478 return PTR_ERR(table);
4479
4480 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4481 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4482 if (IS_ERR(obj))
4483 return PTR_ERR(obj);
4484 if (obj->use > 0)
4485 return -EBUSY;
4486
4487 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4488
4489 return nft_delobj(&ctx, obj);
4490}
4491
25e94a99
PNA		 4492void nft_obj_notify(struct net *net, struct nft_table *table,
4493 struct nft_object *obj, u32 portid, u32 seq, int event,
4494 int family, int report, gfp_t gfp)
e5009240
PNA		 4495{
4496 struct sk_buff *skb;
4497 int err;
4498
2599e989
PNA		 4499 if (!report &&
4500 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4501 return;
e5009240 4502
2599e989 4503 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4504 if (skb == NULL)
4505 goto err;
4506
2599e989
PNA		 4507 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4508 table, obj, false);
e5009240
PNA		 4509 if (err < 0) {
4510 kfree_skb(skb);
4511 goto err;
4512 }
4513
25e94a99
PNA		 4514 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4515 return;
e5009240 4516err:
25e94a99 4517 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 4518}
2599e989
PNA		 4519EXPORT_SYMBOL_GPL(nft_obj_notify);
4520
25e94a99
PNA		 4521static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4522 struct nft_object *obj, int event)
2599e989 4523{
25e94a99
PNA		 4524 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4525 ctx->afi->family, ctx->report, GFP_KERNEL);
2599e989 4526}
e5009240 4527
84d7fce6
PNA		 4528static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4529 u32 portid, u32 seq)
4530{
4531 struct nlmsghdr *nlh;
4532 struct nfgenmsg *nfmsg;
4533 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4534
4535 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4536 if (nlh == NULL)
4537 goto nla_put_failure;
4538
4539 nfmsg = nlmsg_data(nlh);
4540 nfmsg->nfgen_family = AF_UNSPEC;
4541 nfmsg->version = NFNETLINK_V0;
4542 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4543
4544 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4545 goto nla_put_failure;
4546
053c095a
JB		 4547 nlmsg_end(skb, nlh);
4548 return 0;
84d7fce6
PNA		 4549
4550nla_put_failure:
4551 nlmsg_trim(skb, nlh);
4552 return -EMSGSIZE;
4553}
4554
25e94a99
PNA		 4555static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4556 int event)
84d7fce6
PNA		 4557{
4558 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4559 struct sk_buff *skb2;
4560 int err;
4561
4562 if (nlmsg_report(nlh) &&
4563 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4564 return;
84d7fce6 4565
84d7fce6
PNA		 4566 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4567 if (skb2 == NULL)
4568 goto err;
4569
4570 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4571 nlh->nlmsg_seq);
4572 if (err < 0) {
4573 kfree_skb(skb2);
4574 goto err;
4575 }
4576
25e94a99
PNA		 4577 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4578 nlmsg_report(nlh), GFP_KERNEL);
4579 return;
84d7fce6 4580err:
25e94a99
PNA		 4581 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4582 -ENOBUFS);
84d7fce6
PNA		 4583}
4584
7b8002a1
PNA		 4585static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4586 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 4587 const struct nlattr * const nla[])
4588{
84d7fce6
PNA		 4589 struct sk_buff *skb2;
4590 int err;
4591
4592 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4593 if (skb2 == NULL)
4594 return -ENOMEM;
4595
4596 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4597 nlh->nlmsg_seq);
4598 if (err < 0)
4599 goto err;
4600
4601 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4602err:
4603 kfree_skb(skb2);
4604 return err;
4605}
4606
96518518
PM		 4607static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4608 [NFT_MSG_NEWTABLE] = {
55dd6f93 4609 .call_batch = nf_tables_newtable,
96518518
PM		 4610 .attr_count = NFTA_TABLE_MAX,
4611 .policy = nft_table_policy,
4612 },
4613 [NFT_MSG_GETTABLE] = {
4614 .call = nf_tables_gettable,
4615 .attr_count = NFTA_TABLE_MAX,
4616 .policy = nft_table_policy,
4617 },
4618 [NFT_MSG_DELTABLE] = {
55dd6f93 4619 .call_batch = nf_tables_deltable,
96518518
PM		 4620 .attr_count = NFTA_TABLE_MAX,
4621 .policy = nft_table_policy,
4622 },
4623 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4624 .call_batch = nf_tables_newchain,
96518518
PM		 4625 .attr_count = NFTA_CHAIN_MAX,
4626 .policy = nft_chain_policy,
4627 },
4628 [NFT_MSG_GETCHAIN] = {
4629 .call = nf_tables_getchain,
4630 .attr_count = NFTA_CHAIN_MAX,
4631 .policy = nft_chain_policy,
4632 },
4633 [NFT_MSG_DELCHAIN] = {
91c7b38d 4634 .call_batch = nf_tables_delchain,
96518518
PM		 4635 .attr_count = NFTA_CHAIN_MAX,
4636 .policy = nft_chain_policy,
4637 },
4638 [NFT_MSG_NEWRULE] = {
0628b123 4639 .call_batch = nf_tables_newrule,
96518518
PM		 4640 .attr_count = NFTA_RULE_MAX,
4641 .policy = nft_rule_policy,
4642 },
4643 [NFT_MSG_GETRULE] = {
4644 .call = nf_tables_getrule,
4645 .attr_count = NFTA_RULE_MAX,
4646 .policy = nft_rule_policy,
4647 },
4648 [NFT_MSG_DELRULE] = {
0628b123 4649 .call_batch = nf_tables_delrule,
96518518
PM		 4650 .attr_count = NFTA_RULE_MAX,
4651 .policy = nft_rule_policy,
4652 },
20a69341 4653 [NFT_MSG_NEWSET] = {
958bee14 4654 .call_batch = nf_tables_newset,
20a69341
PM		 4655 .attr_count = NFTA_SET_MAX,
4656 .policy = nft_set_policy,
4657 },
4658 [NFT_MSG_GETSET] = {
4659 .call = nf_tables_getset,
4660 .attr_count = NFTA_SET_MAX,
4661 .policy = nft_set_policy,
4662 },
4663 [NFT_MSG_DELSET] = {
958bee14 4664 .call_batch = nf_tables_delset,
20a69341
PM		 4665 .attr_count = NFTA_SET_MAX,
4666 .policy = nft_set_policy,
4667 },
4668 [NFT_MSG_NEWSETELEM] = {
958bee14 4669 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4670 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4671 .policy = nft_set_elem_list_policy,
4672 },
4673 [NFT_MSG_GETSETELEM] = {
4674 .call = nf_tables_getsetelem,
4675 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4676 .policy = nft_set_elem_list_policy,
4677 },
4678 [NFT_MSG_DELSETELEM] = {
958bee14 4679 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4680 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4681 .policy = nft_set_elem_list_policy,
4682 },
84d7fce6
PNA		 4683 [NFT_MSG_GETGEN] = {
4684 .call = nf_tables_getgen,
4685 },
e5009240
PNA		 4686 [NFT_MSG_NEWOBJ] = {
4687 .call_batch = nf_tables_newobj,
4688 .attr_count = NFTA_OBJ_MAX,
4689 .policy = nft_obj_policy,
4690 },
4691 [NFT_MSG_GETOBJ] = {
4692 .call = nf_tables_getobj,
4693 .attr_count = NFTA_OBJ_MAX,
4694 .policy = nft_obj_policy,
4695 },
4696 [NFT_MSG_DELOBJ] = {
4697 .call_batch = nf_tables_delobj,
4698 .attr_count = NFTA_OBJ_MAX,
4699 .policy = nft_obj_policy,
4700 },
43da04a5
PNA		 4701 [NFT_MSG_GETOBJ_RESET] = {
4702 .call = nf_tables_getobj,
4703 .attr_count = NFTA_OBJ_MAX,
4704 .policy = nft_obj_policy,
4705 },
96518518
PM		 4706};
4707
91c7b38d
PNA		 4708static void nft_chain_commit_update(struct nft_trans *trans)
4709{
4710 struct nft_base_chain *basechain;
4711
4712 if (nft_trans_chain_name(trans)[0])
4713 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4714
4715 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4716 return;
4717
4718 basechain = nft_base_chain(trans->ctx.chain);
4719 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4720
4721 switch (nft_trans_chain_policy(trans)) {
4722 case NF_DROP:
4723 case NF_ACCEPT:
4724 basechain->policy = nft_trans_chain_policy(trans);
4725 break;
4726 }
4727}
4728
b326dd37 4729static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 4730{
c7c32e72
PNA		 4731 switch (trans->msg_type) {
4732 case NFT_MSG_DELTABLE:
4733 nf_tables_table_destroy(&trans->ctx);
4734 break;
4735 case NFT_MSG_DELCHAIN:
4736 nf_tables_chain_destroy(trans->ctx.chain);
4737 break;
4738 case NFT_MSG_DELRULE:
4739 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4740 break;
4741 case NFT_MSG_DELSET:
4742 nft_set_destroy(nft_trans_set(trans));
4743 break;
61edafbb
PM		 4744 case NFT_MSG_DELSETELEM:
4745 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4746 nft_trans_elem(trans).priv, true);
61edafbb 4747 break;
e5009240
PNA		 4748 case NFT_MSG_DELOBJ:
4749 nft_obj_destroy(nft_trans_obj(trans));
4750 break;
c7c32e72
PNA		 4751 }
4752 kfree(trans);
4753}
4754
5913beaf 4755static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 4756{
37082f93 4757 struct nft_trans *trans, *next;
a3716e70 4758 struct nft_trans_elem *te;
37082f93
PNA		 4759
4760 /* Bump generation counter, invalidate any dump in progress */
38e029f1 4761 while (++net->nft.base_seq == 0);
37082f93
PNA		 4762
4763 /* A new generation has just started */
ea4bd995 4764 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 4765
4766 /* Make sure all packets have left the previous generation before
4767 * purging old rules.
4768 */
4769 synchronize_rcu();
4770
4771 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 4772 switch (trans->msg_type) {
55dd6f93
PNA		 4773 case NFT_MSG_NEWTABLE:
4774 if (nft_trans_table_update(trans)) {
4775 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4776 nf_tables_table_disable(net,
4777 trans->ctx.afi,
55dd6f93
PNA		 4778 trans->ctx.table);
4779 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4780 }
4781 } else {
f2a6d766 4782 nft_clear(net, trans->ctx.table);
55dd6f93 4783 }
35151d84 4784 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 4785 nft_trans_destroy(trans);
4786 break;
4787 case NFT_MSG_DELTABLE:
f2a6d766 4788 list_del_rcu(&trans->ctx.table->list);
35151d84 4789 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 4790 break;
91c7b38d
PNA		 4791 case NFT_MSG_NEWCHAIN:
4792 if (nft_trans_chain_update(trans))
4793 nft_chain_commit_update(trans);
4fefee57 4794 else
664b0f8c 4795 nft_clear(net, trans->ctx.chain);
4fefee57 4796
35151d84 4797 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 4798 nft_trans_destroy(trans);
4799 break;
4800 case NFT_MSG_DELCHAIN:
664b0f8c 4801 list_del_rcu(&trans->ctx.chain->list);
35151d84 4802 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 4803 nf_tables_unregister_hooks(trans->ctx.net,
4804 trans->ctx.table,
c5598794
AB		 4805 trans->ctx.chain,
4806 trans->ctx.afi->nops);
91c7b38d 4807 break;
b380e5c7 4808 case NFT_MSG_NEWRULE:
889f7ee7 4809 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 4810 nf_tables_rule_notify(&trans->ctx,
37082f93 4811 nft_trans_rule(trans),
35151d84 4812 NFT_MSG_NEWRULE);
37082f93 4813 nft_trans_destroy(trans);
b380e5c7
PNA		 4814 break;
4815 case NFT_MSG_DELRULE:
4816 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 4817 nf_tables_rule_notify(&trans->ctx,
4818 nft_trans_rule(trans),
4819 NFT_MSG_DELRULE);
b380e5c7 4820 break;
958bee14 4821 case NFT_MSG_NEWSET:
37a9cc52 4822 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 4823 /* This avoids hitting -EBUSY when deleting the table
4824 * from the transaction.
4825 */
4826 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4827 !list_empty(&nft_trans_set(trans)->bindings))
4828 trans->ctx.table->use--;
4829
958bee14 4830 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4831 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4832 nft_trans_destroy(trans);
4833 break;
4834 case NFT_MSG_DELSET:
37a9cc52 4835 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 4836 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4837 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4838 break;
60319eb1 4839 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4840 te = (struct nft_trans_elem *)trans->data;
4841
42a55769 4842 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 4843 nf_tables_setelem_notify(&trans->ctx, te->set,
4844 &te->elem,
60319eb1
PNA		 4845 NFT_MSG_NEWSETELEM, 0);
4846 nft_trans_destroy(trans);
4847 break;
4848 case NFT_MSG_DELSETELEM:
a3716e70 4849 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4850
a3716e70
PNA		 4851 nf_tables_setelem_notify(&trans->ctx, te->set,
4852 &te->elem,
60319eb1 4853 NFT_MSG_DELSETELEM, 0);
5cb82a38 4854 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 4855 atomic_dec(&te->set->nelems);
4856 te->set->ndeact--;
60319eb1 4857 break;
e5009240
PNA		 4858 case NFT_MSG_NEWOBJ:
4859 nft_clear(net, nft_trans_obj(trans));
4860 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4861 NFT_MSG_NEWOBJ);
4862 nft_trans_destroy(trans);
4863 break;
4864 case NFT_MSG_DELOBJ:
4865 list_del_rcu(&nft_trans_obj(trans)->list);
4866 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4867 NFT_MSG_DELOBJ);
4868 break;
37082f93 4869 }
37082f93
PNA		 4870 }
4871
b326dd37
PNA		 4872 synchronize_rcu();
4873
37082f93 4874 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4875 list_del(&trans->list);
b326dd37 4876 nf_tables_commit_release(trans);
37082f93 4877 }
84d7fce6
PNA		 4878
4879 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4880
4881 return 0;
4882}
4883
b326dd37 4884static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4885{
c7c32e72
PNA		 4886 switch (trans->msg_type) {
4887 case NFT_MSG_NEWTABLE:
4888 nf_tables_table_destroy(&trans->ctx);
4889 break;
4890 case NFT_MSG_NEWCHAIN:
4891 nf_tables_chain_destroy(trans->ctx.chain);
4892 break;
4893 case NFT_MSG_NEWRULE:
4894 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4895 break;
4896 case NFT_MSG_NEWSET:
4897 nft_set_destroy(nft_trans_set(trans));
4898 break;
61edafbb
PM		 4899 case NFT_MSG_NEWSETELEM:
4900 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4901 nft_trans_elem(trans).priv, true);
61edafbb 4902 break;
e5009240
PNA		 4903 case NFT_MSG_NEWOBJ:
4904 nft_obj_destroy(nft_trans_obj(trans));
4905 break;
c7c32e72
PNA		 4906 }
4907 kfree(trans);
4908}
4909
5913beaf 4910static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4911{
37082f93 4912 struct nft_trans *trans, *next;
02263db0 4913 struct nft_trans_elem *te;
37082f93 4914
a907e36d
XL		 4915 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4916 list) {
b380e5c7 4917 switch (trans->msg_type) {
55dd6f93
PNA		 4918 case NFT_MSG_NEWTABLE:
4919 if (nft_trans_table_update(trans)) {
4920 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4921 nf_tables_table_disable(net,
4922 trans->ctx.afi,
55dd6f93
PNA		 4923 trans->ctx.table);
4924 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4925 }
4926 nft_trans_destroy(trans);
4927 } else {
e688a7f8 4928 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4929 }
4930 break;
4931 case NFT_MSG_DELTABLE:
f2a6d766 4932 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 4933 nft_trans_destroy(trans);
4934 break;
91c7b38d
PNA		 4935 case NFT_MSG_NEWCHAIN:
4936 if (nft_trans_chain_update(trans)) {
982f4051 4937 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4938
4939 nft_trans_destroy(trans);
4940 } else {
4fefee57 4941 trans->ctx.table->use--;
e688a7f8 4942 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 4943 nf_tables_unregister_hooks(trans->ctx.net,
4944 trans->ctx.table,
c5598794
AB		 4945 trans->ctx.chain,
4946 trans->ctx.afi->nops);
91c7b38d
PNA		 4947 }
4948 break;
4949 case NFT_MSG_DELCHAIN:
4fefee57 4950 trans->ctx.table->use++;
664b0f8c 4951 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 4952 nft_trans_destroy(trans);
4953 break;
b380e5c7 4954 case NFT_MSG_NEWRULE:
4fefee57 4955 trans->ctx.chain->use--;
b380e5c7
PNA		 4956 list_del_rcu(&nft_trans_rule(trans)->list);
4957 break;
4958 case NFT_MSG_DELRULE:
4fefee57 4959 trans->ctx.chain->use++;
889f7ee7 4960 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4961 nft_trans_destroy(trans);
b380e5c7 4962 break;
958bee14 4963 case NFT_MSG_NEWSET:
4fefee57 4964 trans->ctx.table->use--;
e688a7f8 4965 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4966 break;
4967 case NFT_MSG_DELSET:
4fefee57 4968 trans->ctx.table->use++;
37a9cc52 4969 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 4970 nft_trans_destroy(trans);
4971 break;
60319eb1 4972 case NFT_MSG_NEWSETELEM:
02263db0 4973 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4974
5cb82a38 4975 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 4976 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4977 break;
4978 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4979 te = (struct nft_trans_elem *)trans->data;
4980
42a55769 4981 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 4982 te->set->ndeact--;
cc02e457 4983
e5009240
PNA		 4984 nft_trans_destroy(trans);
4985 break;
4986 case NFT_MSG_NEWOBJ:
4987 trans->ctx.table->use--;
4988 list_del_rcu(&nft_trans_obj(trans)->list);
4989 break;
4990 case NFT_MSG_DELOBJ:
4991 trans->ctx.table->use++;
4992 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 4993 nft_trans_destroy(trans);
4994 break;
37082f93 4995 }
37082f93
PNA		 4996 }
4997
b326dd37
PNA		 4998 synchronize_rcu();
4999
a1cee076
PNA		 5000 list_for_each_entry_safe_reverse(trans, next,
5001 &net->nft.commit_list, list) {
c7c32e72 5002 list_del(&trans->list);
b326dd37 5003 nf_tables_abort_release(trans);
37082f93
PNA		 5004 }
5005
5006 return 0;
5007}
5008
74e8bcd2
PNA		 5009static bool nf_tables_valid_genid(struct net *net, u32 genid)
5010{
5011 return net->nft.base_seq == genid;
5012}
5013
96518518
PM		 5014static const struct nfnetlink_subsystem nf_tables_subsys = {
5015 .name = "nf_tables",
5016 .subsys_id = NFNL_SUBSYS_NFTABLES,
5017 .cb_count = NFT_MSG_MAX,
5018 .cb = nf_tables_cb,
0628b123
PNA		 5019 .commit = nf_tables_commit,
5020 .abort = nf_tables_abort,
74e8bcd2 5021 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5022};
5023
7210e4e3
PNA		 5024int nft_chain_validate_dependency(const struct nft_chain *chain,
5025 enum nft_chain_type type)
5026{
5027 const struct nft_base_chain *basechain;
5028
5029 if (chain->flags & NFT_BASE_CHAIN) {
5030 basechain = nft_base_chain(chain);
5031 if (basechain->type->type != type)
5032 return -EOPNOTSUPP;
5033 }
5034 return 0;
5035}
5036EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5037
75e8d06d
PNA		 5038int nft_chain_validate_hooks(const struct nft_chain *chain,
5039 unsigned int hook_flags)
5040{
5041 struct nft_base_chain *basechain;
5042
5043 if (chain->flags & NFT_BASE_CHAIN) {
5044 basechain = nft_base_chain(chain);
5045
5046 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5047 return 0;
5048
5049 return -EOPNOTSUPP;
5050 }
5051
5052 return 0;
5053}
5054EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5055
20a69341
PM		 5056/*
5057 * Loop detection - walk through the ruleset beginning at the destination chain
5058 * of a new jump until either the source chain is reached (loop) or all
5059 * reachable chains have been traversed.
5060 *
5061 * The loop check is performed whenever a new jump verdict is added to an
5062 * expression or verdict map or a verdict map is bound to a new chain.
5063 */
5064
5065static int nf_tables_check_loops(const struct nft_ctx *ctx,
5066 const struct nft_chain *chain);
5067
5068static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5069 struct nft_set *set,
20a69341 5070 const struct nft_set_iter *iter,
de70185d 5071 struct nft_set_elem *elem)
20a69341 5072{
fe2811eb
PM		 5073 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5074 const struct nft_data *data;
5075
5076 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5077 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5078 return 0;
5079
fe2811eb 5080 data = nft_set_ext_data(ext);
1ca2e170 5081 switch (data->verdict.code) {
20a69341
PM		 5082 case NFT_JUMP:
5083 case NFT_GOTO:
1ca2e170 5084 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5085 default:
5086 return 0;
5087 }
5088}
5089
5090static int nf_tables_check_loops(const struct nft_ctx *ctx,
5091 const struct nft_chain *chain)
5092{
5093 const struct nft_rule *rule;
5094 const struct nft_expr *expr, *last;
de70185d 5095 struct nft_set *set;
20a69341
PM		 5096 struct nft_set_binding *binding;
5097 struct nft_set_iter iter;
20a69341
PM		 5098
5099 if (ctx->chain == chain)
5100 return -ELOOP;
5101
5102 list_for_each_entry(rule, &chain->rules, list) {
5103 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5104 const struct nft_data *data = NULL;
5105 int err;
5106
5107 if (!expr->ops->validate)
20a69341
PM		 5108 continue;
5109
0ca743a5
PNA		 5110 err = expr->ops->validate(ctx, expr, &data);
5111 if (err < 0)
5112 return err;
5113
20a69341 5114 if (data == NULL)
0ca743a5 5115 continue;
20a69341 5116
1ca2e170 5117 switch (data->verdict.code) {
20a69341
PM		 5118 case NFT_JUMP:
5119 case NFT_GOTO:
1ca2e170
PM		 5120 err = nf_tables_check_loops(ctx,
5121 data->verdict.chain);
20a69341
PM		 5122 if (err < 0)
5123 return err;
5124 default:
5125 break;
5126 }
5127 }
5128 }
5129
5130 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5131 if (!nft_is_active_next(ctx->net, set))
5132 continue;
20a69341
PM		 5133 if (!(set->flags & NFT_SET_MAP) ||
5134 set->dtype != NFT_DATA_VERDICT)
5135 continue;
5136
5137 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5138 if (!(binding->flags & NFT_SET_MAP) ||
5139 binding->chain != chain)
20a69341
PM		 5140 continue;
5141
8588ac09 5142 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5143 iter.skip = 0;
5144 iter.count = 0;
5145 iter.err = 0;
5146 iter.fn = nf_tables_loop_check_setelem;
5147
5148 set->ops->walk(ctx, set, &iter);
5149 if (iter.err < 0)
5150 return iter.err;
5151 }
5152 }
5153
5154 return 0;
5155}
5156
36b701fa
LGL		 5157/**
5158 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5159 *
5160 * @attr: netlink attribute to fetch value from
5161 * @max: maximum value to be stored in dest
5162 * @dest: pointer to the variable
5163 *
5164 * Parse, check and store a given u32 netlink attribute into variable.
5165 * This function returns -ERANGE if the value goes over maximum value.
5166 * Otherwise a 0 is returned and the attribute value is stored in the
5167 * destination variable.
5168 */
f1d505bb 5169int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5170{
09525a09 5171 u32 val;
36b701fa
LGL		 5172
5173 val = ntohl(nla_get_be32(attr));
5174 if (val > max)
5175 return -ERANGE;
5176
5177 *dest = val;
5178 return 0;
5179}
5180EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5181
49499c3e
PM		 5182/**
5183 * nft_parse_register - parse a register value from a netlink attribute
5184 *
5185 * @attr: netlink attribute
5186 *
5187 * Parse and translate a register value from a netlink attribute.
5188 * Registers used to be 128 bit wide, these register numbers will be
5189 * mapped to the corresponding 32 bit register numbers.
5190 */
b1c96ed3
PM		 5191unsigned int nft_parse_register(const struct nlattr *attr)
5192{
49499c3e
PM		 5193 unsigned int reg;
5194
5195 reg = ntohl(nla_get_be32(attr));
5196 switch (reg) {
5197 case NFT_REG_VERDICT...NFT_REG_4:
5198 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5199 default:
5200 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5201 }
b1c96ed3
PM		 5202}
5203EXPORT_SYMBOL_GPL(nft_parse_register);
5204
49499c3e
PM		 5205/**
5206 * nft_dump_register - dump a register value to a netlink attribute
5207 *
5208 * @skb: socket buffer
5209 * @attr: attribute number
5210 * @reg: register number
5211 *
5212 * Construct a netlink attribute containing the register number. For
5213 * compatibility reasons, register numbers being a multiple of 4 are
5214 * translated to the corresponding 128 bit register numbers.
5215 */
b1c96ed3
PM		 5216int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5217{
49499c3e
PM		 5218 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5219 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5220 else
5221 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5222
b1c96ed3
PM		 5223 return nla_put_be32(skb, attr, htonl(reg));
5224}
5225EXPORT_SYMBOL_GPL(nft_dump_register);
5226
96518518 5227/**
d07db988 5228 * nft_validate_register_load - validate a load from a register
96518518
PM		 5229 *
5230 * @reg: the register number
d07db988 5231 * @len: the length of the data
96518518
PM		 5232 *
5233 * Validate that the input register is one of the general purpose
d07db988 5234 * registers and that the length of the load is within the bounds.
96518518 5235 */
d07db988 5236int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5237{
49499c3e 5238 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5239 return -EINVAL;
d07db988
PM		 5240 if (len == 0)
5241 return -EINVAL;
49499c3e 5242 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5243 return -ERANGE;
49499c3e 5244
96518518
PM		 5245 return 0;
5246}
d07db988 5247EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5248
96518518 5249/**
1ec10212 5250 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5251 *
5252 * @ctx: context of the expression performing the load
5253 * @reg: the destination register number
5254 * @data: the data to load
5255 * @type: the data type
45d9bcda 5256 * @len: the length of the data
96518518
PM		 5257 *
5258 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5259 * the destination register and the length is within the bounds.
5260 * A value of NULL for the data means that its runtime gathered
58f40ab6 5261 * data.
96518518 5262 */
1ec10212
PM		 5263int nft_validate_register_store(const struct nft_ctx *ctx,
5264 enum nft_registers reg,
5265 const struct nft_data *data,
5266 enum nft_data_types type, unsigned int len)
96518518 5267{
20a69341
PM		 5268 int err;
5269
96518518
PM		 5270 switch (reg) {
5271 case NFT_REG_VERDICT:
58f40ab6 5272 if (type != NFT_DATA_VERDICT)
96518518 5273 return -EINVAL;
20a69341 5274
58f40ab6 5275 if (data != NULL &&
1ca2e170
PM		 5276 (data->verdict.code == NFT_GOTO ||
5277 data->verdict.code == NFT_JUMP)) {
5278 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5279 if (err < 0)
5280 return err;
5281
1ca2e170
PM		 5282 if (ctx->chain->level + 1 >
5283 data->verdict.chain->level) {
20a69341
PM		 5284 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5285 return -EMLINK;
1ca2e170 5286 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5287 }
5288 }
5289
96518518
PM		 5290 return 0;
5291 default:
49499c3e 5292 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5293 return -EINVAL;
45d9bcda
PM		 5294 if (len == 0)
5295 return -EINVAL;
49499c3e
PM		 5296 if (reg * NFT_REG32_SIZE + len >
5297 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5298 return -ERANGE;
27e6d201 5299
96518518
PM		 5300 if (data != NULL && type != NFT_DATA_VALUE)
5301 return -EINVAL;
5302 return 0;
5303 }
5304}
1ec10212 5305EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5306
5307static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5308 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5309 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5310 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5311};
5312
5313static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5314 struct nft_data_desc *desc, const struct nlattr *nla)
5315{
664b0f8c 5316 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5317 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5318 struct nft_chain *chain;
5319 int err;
5320
fceb6435
JB		 5321 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5322 NULL);
96518518
PM		 5323 if (err < 0)
5324 return err;
5325
5326 if (!tb[NFTA_VERDICT_CODE])
5327 return -EINVAL;
1ca2e170 5328 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5329
1ca2e170 5330 switch (data->verdict.code) {
e0abdadc 5331 default:
1ca2e170 5332 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5333 case NF_ACCEPT:
5334 case NF_DROP:
5335 case NF_QUEUE:
5336 break;
5337 default:
5338 return -EINVAL;
5339 }
5340 /* fall through */
96518518
PM		 5341 case NFT_CONTINUE:
5342 case NFT_BREAK:
5343 case NFT_RETURN:
96518518
PM		 5344 break;
5345 case NFT_JUMP:
5346 case NFT_GOTO:
5347 if (!tb[NFTA_VERDICT_CHAIN])
5348 return -EINVAL;
5349 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5350 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5351 if (IS_ERR(chain))
5352 return PTR_ERR(chain);
5353 if (chain->flags & NFT_BASE_CHAIN)
5354 return -EOPNOTSUPP;
5355
96518518 5356 chain->use++;
1ca2e170 5357 data->verdict.chain = chain;
96518518 5358 break;
96518518
PM		 5359 }
5360
4c4ed074 5361 desc->len = sizeof(data->verdict);
96518518
PM		 5362 desc->type = NFT_DATA_VERDICT;
5363 return 0;
5364}
5365
5366static void nft_verdict_uninit(const struct nft_data *data)
5367{
1ca2e170 5368 switch (data->verdict.code) {
96518518
PM		 5369 case NFT_JUMP:
5370 case NFT_GOTO:
1ca2e170 5371 data->verdict.chain->use--;
96518518
PM		 5372 break;
5373 }
5374}
5375
33d5a7b1 5376int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5377{
5378 struct nlattr *nest;
5379
33d5a7b1 5380 nest = nla_nest_start(skb, type);
96518518
PM		 5381 if (!nest)
5382 goto nla_put_failure;
5383
33d5a7b1 5384 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5385 goto nla_put_failure;
5386
33d5a7b1 5387 switch (v->code) {
96518518
PM		 5388 case NFT_JUMP:
5389 case NFT_GOTO:
1ca2e170 5390 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5391 v->chain->name))
96518518
PM		 5392 goto nla_put_failure;
5393 }
5394 nla_nest_end(skb, nest);
5395 return 0;
5396
5397nla_put_failure:
5398 return -1;
5399}
5400
d0a11fc3
PM		 5401static int nft_value_init(const struct nft_ctx *ctx,
5402 struct nft_data *data, unsigned int size,
96518518
PM		 5403 struct nft_data_desc *desc, const struct nlattr *nla)
5404{
5405 unsigned int len;
5406
5407 len = nla_len(nla);
5408 if (len == 0)
5409 return -EINVAL;
d0a11fc3 5410 if (len > size)
96518518
PM		 5411 return -EOVERFLOW;
5412
d0a11fc3 5413 nla_memcpy(data->data, nla, len);
96518518
PM		 5414 desc->type = NFT_DATA_VALUE;
5415 desc->len = len;
5416 return 0;
5417}
5418
5419static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5420 unsigned int len)
5421{
5422 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5423}
5424
5425static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5426 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5427 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5428};
5429
5430/**
5431 * nft_data_init - parse nf_tables data netlink attributes
5432 *
5433 * @ctx: context of the expression using the data
5434 * @data: destination struct nft_data
d0a11fc3 5435 * @size: maximum data length
96518518
PM		 5436 * @desc: data description
5437 * @nla: netlink attribute containing data
5438 *
5439 * Parse the netlink data attributes and initialize a struct nft_data.
5440 * The type and length of data are returned in the data description.
5441 *
5442 * The caller can indicate that it only wants to accept data of type
5443 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5444 */
d0a11fc3
PM		 5445int nft_data_init(const struct nft_ctx *ctx,
5446 struct nft_data *data, unsigned int size,
96518518
PM		 5447 struct nft_data_desc *desc, const struct nlattr *nla)
5448{
5449 struct nlattr *tb[NFTA_DATA_MAX + 1];
5450 int err;
5451
fceb6435 5452 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 5453 if (err < 0)
5454 return err;
5455
5456 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5457 return nft_value_init(ctx, data, size, desc,
5458 tb[NFTA_DATA_VALUE]);
96518518
PM		 5459 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5460 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5461 return -EINVAL;
5462}
5463EXPORT_SYMBOL_GPL(nft_data_init);
5464
5465/**
5466 * nft_data_uninit - release a nft_data item
5467 *
5468 * @data: struct nft_data to release
5469 * @type: type of data
5470 *
5471 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5472 * all others need to be released by calling this function.
5473 */
5474void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5475{
960bd2c2 5476 if (type < NFT_DATA_VERDICT)
96518518 5477 return;
960bd2c2 5478 switch (type) {
96518518
PM		 5479 case NFT_DATA_VERDICT:
5480 return nft_verdict_uninit(data);
5481 default:
5482 WARN_ON(1);
5483 }
5484}
5485EXPORT_SYMBOL_GPL(nft_data_uninit);
5486
5487int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5488 enum nft_data_types type, unsigned int len)
5489{
5490 struct nlattr *nest;
5491 int err;
5492
5493 nest = nla_nest_start(skb, attr);
5494 if (nest == NULL)
5495 return -1;
5496
5497 switch (type) {
5498 case NFT_DATA_VALUE:
5499 err = nft_value_dump(skb, data, len);
5500 break;
5501 case NFT_DATA_VERDICT:
33d5a7b1 5502 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5503 break;
5504 default:
5505 err = -EINVAL;
5506 WARN_ON(1);
5507 }
5508
5509 nla_nest_end(skb, nest);
5510 return err;
5511}
5512EXPORT_SYMBOL_GPL(nft_data_dump);
5513
df05ef87 5514static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5515{
5516 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5517 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5518 net->nft.base_seq = 1;
99633ab2
PNA		 5519 return 0;
5520}
5521
5ebe0b0e
PNA		 5522int __nft_release_basechain(struct nft_ctx *ctx)
5523{
5524 struct nft_rule *rule, *nr;
5525
5526 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5527
82bec71d 5528 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 5529 ctx->afi->nops);
5530 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5531 list_del(&rule->list);
5532 ctx->chain->use--;
5533 nf_tables_rule_destroy(ctx, rule);
5534 }
5535 list_del(&ctx->chain->list);
5536 ctx->table->use--;
5537 nf_tables_chain_destroy(ctx->chain);
5538
5539 return 0;
5540}
5541EXPORT_SYMBOL_GPL(__nft_release_basechain);
5542
df05ef87
PNA		 5543/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5544static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5545{
5546 struct nft_table *table, *nt;
5547 struct nft_chain *chain, *nc;
e5009240 5548 struct nft_object *obj, *ne;
df05ef87
PNA		 5549 struct nft_rule *rule, *nr;
5550 struct nft_set *set, *ns;
5551 struct nft_ctx ctx = {
5552 .net = net,
5553 .afi = afi,
5554 };
5555
5556 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5557 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 5558 nf_tables_unregister_hooks(net, table, chain,
5559 afi->nops);
df05ef87
PNA		 5560 /* No packets are walking on these chains anymore. */
5561 ctx.table = table;
5562 list_for_each_entry(chain, &table->chains, list) {
5563 ctx.chain = chain;
5564 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5565 list_del(&rule->list);
5566 chain->use--;
5567 nf_tables_rule_destroy(&ctx, rule);
5568 }
5569 }
5570 list_for_each_entry_safe(set, ns, &table->sets, list) {
5571 list_del(&set->list);
5572 table->use--;
5573 nft_set_destroy(set);
5574 }
e5009240
PNA		 5575 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5576 list_del(&obj->list);
5577 table->use--;
5578 nft_obj_destroy(obj);
5579 }
df05ef87
PNA		 5580 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5581 list_del(&chain->list);
5582 table->use--;
5583 nf_tables_chain_destroy(chain);
5584 }
5585 list_del(&table->list);
5586 nf_tables_table_destroy(&ctx);
5587 }
5588}
5589
99633ab2
PNA		 5590static struct pernet_operations nf_tables_net_ops = {
5591 .init = nf_tables_init_net,
5592};
5593
96518518
PM		 5594static int __init nf_tables_module_init(void)
5595{
5596 int err;
5597
5598 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5599 GFP_KERNEL);
5600 if (info == NULL) {
5601 err = -ENOMEM;
5602 goto err1;
5603 }
5604
5605 err = nf_tables_core_module_init();
5606 if (err < 0)
5607 goto err2;
5608
5609 err = nfnetlink_subsys_register(&nf_tables_subsys);
5610 if (err < 0)
5611 goto err3;
5612
5613 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5614 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5615err3:
5616 nf_tables_core_module_exit();
5617err2:
5618 kfree(info);
5619err1:
5620 return err;
5621}
5622
5623static void __exit nf_tables_module_exit(void)
5624{
99633ab2 5625 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5626 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5627 rcu_barrier();
96518518
PM		 5628 nf_tables_core_module_exit();
5629 kfree(info);
5630}
5631
5632module_init(nf_tables_module_init);
5633module_exit(nf_tables_module_exit);
5634
5635MODULE_LICENSE("GPL");
5636MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5637MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git