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netfilter: nft_set_rbtree: incorrect assumption on lower interval lookups
[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nf_tables_api.c
CommitLineData
96518518 1/*
20a69341 2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518
PM		 3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/list.h>
14#include <linux/skbuff.h>
15#include <linux/netlink.h>
16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_tables_core.h>
20#include <net/netfilter/nf_tables.h>
99633ab2 21#include <net/net_namespace.h>
96518518
PM		 22#include <net/sock.h>
23
96518518 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
35151d84 464static int 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))
96518518
PM		 471 return 0;
472
473 err = -ENOBUFS;
474 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
475 if (skb == NULL)
476 goto err;
477
84d7fce6
PNA		 478 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
479 event, 0, ctx->afi->family, ctx->table);
96518518
PM		 480 if (err < 0) {
481 kfree_skb(skb);
482 goto err;
483 }
484
128ad332
PNA		 485 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
486 ctx->report, GFP_KERNEL);
96518518 487err:
128ad332
PNA		 488 if (err < 0) {
489 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
490 err);
491 }
96518518
PM		 492 return err;
493}
494
495static int nf_tables_dump_tables(struct sk_buff *skb,
496 struct netlink_callback *cb)
497{
498 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
499 const struct nft_af_info *afi;
500 const struct nft_table *table;
501 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 502 struct net *net = sock_net(skb->sk);
96518518
PM		 503 int family = nfmsg->nfgen_family;
504
e688a7f8 505 rcu_read_lock();
38e029f1
PNA		 506 cb->seq = net->nft.base_seq;
507
e688a7f8 508 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 509 if (family != NFPROTO_UNSPEC && family != afi->family)
510 continue;
511
e688a7f8 512 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 513 if (idx < s_idx)
514 goto cont;
515 if (idx > s_idx)
516 memset(&cb->args[1], 0,
517 sizeof(cb->args) - sizeof(cb->args[0]));
f2a6d766
PNA		 518 if (!nft_is_active(net, table))
519 continue;
84d7fce6 520 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 521 NETLINK_CB(cb->skb).portid,
522 cb->nlh->nlmsg_seq,
523 NFT_MSG_NEWTABLE,
524 NLM_F_MULTI,
525 afi->family, table) < 0)
526 goto done;
38e029f1
PNA		 527
528 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 529cont:
530 idx++;
531 }
532 }
533done:
e688a7f8 534 rcu_read_unlock();
96518518
PM		 535 cb->args[0] = idx;
536 return skb->len;
537}
538
7b8002a1
PNA		 539static int nf_tables_gettable(struct net *net, struct sock *nlsk,
540 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 541 const struct nlattr * const nla[])
542{
543 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 544 u8 genmask = nft_genmask_cur(net);
96518518
PM		 545 const struct nft_af_info *afi;
546 const struct nft_table *table;
547 struct sk_buff *skb2;
548 int family = nfmsg->nfgen_family;
549 int err;
550
551 if (nlh->nlmsg_flags & NLM_F_DUMP) {
552 struct netlink_dump_control c = {
553 .dump = nf_tables_dump_tables,
554 };
555 return netlink_dump_start(nlsk, skb, nlh, &c);
556 }
557
99633ab2 558 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 559 if (IS_ERR(afi))
560 return PTR_ERR(afi);
561
f2a6d766 562 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 563 if (IS_ERR(table))
564 return PTR_ERR(table);
565
566 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
567 if (!skb2)
568 return -ENOMEM;
569
84d7fce6 570 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 571 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
572 family, table);
573 if (err < 0)
574 goto err;
575
576 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
577
578err:
579 kfree_skb(skb2);
580 return err;
581}
582
10435c11
F		 583static void _nf_tables_table_disable(struct net *net,
584 const struct nft_af_info *afi,
585 struct nft_table *table,
586 u32 cnt)
587{
588 struct nft_chain *chain;
589 u32 i = 0;
590
591 list_for_each_entry(chain, &table->chains, list) {
592 if (!nft_is_active_next(net, chain))
593 continue;
594 if (!(chain->flags & NFT_BASE_CHAIN))
595 continue;
596
597 if (cnt && i++ == cnt)
598 break;
599
600 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
601 afi->nops);
602 }
603}
604
664b0f8c
PNA		 605static int nf_tables_table_enable(struct net *net,
606 const struct nft_af_info *afi,
115a60b1 607 struct nft_table *table)
9ddf6323
PNA		 608{
609 struct nft_chain *chain;
610 int err, i = 0;
611
612 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 613 if (!nft_is_active_next(net, chain))
614 continue;
d2012975
PNA		 615 if (!(chain->flags & NFT_BASE_CHAIN))
616 continue;
617
82bec71d
PNA		 618 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
619 afi->nops);
9ddf6323
PNA		 620 if (err < 0)
621 goto err;
622
623 i++;
624 }
625 return 0;
626err:
10435c11
F		 627 if (i)
628 _nf_tables_table_disable(net, afi, table, i);
9ddf6323
PNA		 629 return err;
630}
631
664b0f8c
PNA		 632static void nf_tables_table_disable(struct net *net,
633 const struct nft_af_info *afi,
d8ee8f7c 634 struct nft_table *table)
9ddf6323 635{
10435c11 636 _nf_tables_table_disable(net, afi, table, 0);
9ddf6323
PNA		 637}
638
e1aaca93 639static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 640{
55dd6f93 641 struct nft_trans *trans;
e1aaca93 642 u32 flags;
55dd6f93 643 int ret = 0;
9ddf6323 644
e1aaca93
PNA		 645 if (!ctx->nla[NFTA_TABLE_FLAGS])
646 return 0;
9ddf6323 647
e1aaca93
PNA		 648 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
649 if (flags & ~NFT_TABLE_F_DORMANT)
650 return -EINVAL;
651
63283dd2
PNA		 652 if (flags == ctx->table->flags)
653 return 0;
654
55dd6f93
PNA		 655 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
656 sizeof(struct nft_trans_table));
657 if (trans == NULL)
658 return -ENOMEM;
9ddf6323 659
e1aaca93
PNA		 660 if ((flags & NFT_TABLE_F_DORMANT) &&
661 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 662 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 663 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
664 ctx->table->flags & NFT_TABLE_F_DORMANT) {
664b0f8c 665 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
55dd6f93 666 if (ret >= 0) {
e1aaca93 667 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 668 nft_trans_table_enable(trans) = true;
9ddf6323 669 }
9ddf6323 670 }
e1aaca93
PNA		 671 if (ret < 0)
672 goto err;
9ddf6323 673
55dd6f93
PNA		 674 nft_trans_table_update(trans) = true;
675 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
676 return 0;
9ddf6323 677err:
55dd6f93 678 nft_trans_destroy(trans);
9ddf6323
PNA		 679 return ret;
680}
681
633c9a84
PNA		 682static int nf_tables_newtable(struct net *net, struct sock *nlsk,
683 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 684 const struct nlattr * const nla[])
685{
686 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 687 u8 genmask = nft_genmask_next(net);
96518518
PM		 688 const struct nlattr *name;
689 struct nft_af_info *afi;
690 struct nft_table *table;
691 int family = nfmsg->nfgen_family;
c5c1f975 692 u32 flags = 0;
e1aaca93 693 struct nft_ctx ctx;
55dd6f93 694 int err;
96518518 695
99633ab2 696 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 697 if (IS_ERR(afi))
698 return PTR_ERR(afi);
699
700 name = nla[NFTA_TABLE_NAME];
f2a6d766 701 table = nf_tables_table_lookup(afi, name, genmask);
96518518
PM		 702 if (IS_ERR(table)) {
703 if (PTR_ERR(table) != -ENOENT)
704 return PTR_ERR(table);
1a28ad74 705 } else {
96518518
PM		 706 if (nlh->nlmsg_flags & NLM_F_EXCL)
707 return -EEXIST;
708 if (nlh->nlmsg_flags & NLM_F_REPLACE)
709 return -EOPNOTSUPP;
e1aaca93 710
633c9a84 711 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 712 return nf_tables_updtable(&ctx);
96518518
PM		 713 }
714
c5c1f975
PM		 715 if (nla[NFTA_TABLE_FLAGS]) {
716 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
717 if (flags & ~NFT_TABLE_F_DORMANT)
718 return -EINVAL;
719 }
720
ebddf1a8 721 err = -EAFNOSUPPORT;
7047f9d0 722 if (!try_module_get(afi->owner))
ebddf1a8 723 goto err1;
7047f9d0 724
ffdb210e 725 err = -ENOMEM;
1cae565e 726 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 727 if (table == NULL)
ebddf1a8 728 goto err2;
96518518 729
1cae565e 730 nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
96518518 731 INIT_LIST_HEAD(&table->chains);
20a69341 732 INIT_LIST_HEAD(&table->sets);
e5009240 733 INIT_LIST_HEAD(&table->objects);
c5c1f975 734 table->flags = flags;
9ddf6323 735
633c9a84 736 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 737 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 738 if (err < 0)
ebddf1a8 739 goto err3;
ffdb210e 740
e688a7f8 741 list_add_tail_rcu(&table->list, &afi->tables);
96518518 742 return 0;
ebddf1a8 743err3:
ffdb210e 744 kfree(table);
ebddf1a8 745err2:
ffdb210e 746 module_put(afi->owner);
ebddf1a8 747err1:
ffdb210e 748 return err;
96518518
PM		 749}
750
b9ac12ef
AB		 751static int nft_flush_table(struct nft_ctx *ctx)
752{
753 int err;
754 struct nft_chain *chain, *nc;
e5009240 755 struct nft_object *obj, *ne;
b9ac12ef
AB		 756 struct nft_set *set, *ns;
757
a2f18db0 758 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 759 if (!nft_is_active_next(ctx->net, chain))
760 continue;
761
b9ac12ef
AB		 762 ctx->chain = chain;
763
764 err = nft_delrule_by_chain(ctx);
765 if (err < 0)
766 goto out;
b9ac12ef
AB		 767 }
768
769 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 770 if (!nft_is_active_next(ctx->net, set))
771 continue;
772
b9ac12ef
AB		 773 if (set->flags & NFT_SET_ANONYMOUS &&
774 !list_empty(&set->bindings))
775 continue;
776
777 err = nft_delset(ctx, set);
778 if (err < 0)
779 goto out;
780 }
781
e5009240
PNA		 782 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
783 err = nft_delobj(ctx, obj);
784 if (err < 0)
785 goto out;
786 }
787
a2f18db0 788 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 789 if (!nft_is_active_next(ctx->net, chain))
790 continue;
791
a2f18db0
PNA		 792 ctx->chain = chain;
793
794 err = nft_delchain(ctx);
795 if (err < 0)
796 goto out;
797 }
798
b9ac12ef
AB		 799 err = nft_deltable(ctx);
800out:
801 return err;
802}
803
804static int nft_flush(struct nft_ctx *ctx, int family)
805{
806 struct nft_af_info *afi;
807 struct nft_table *table, *nt;
808 const struct nlattr * const *nla = ctx->nla;
809 int err = 0;
810
811 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
812 if (family != AF_UNSPEC && afi->family != family)
813 continue;
814
815 ctx->afi = afi;
816 list_for_each_entry_safe(table, nt, &afi->tables, list) {
f2a6d766
PNA		 817 if (!nft_is_active_next(ctx->net, table))
818 continue;
819
b9ac12ef
AB		 820 if (nla[NFTA_TABLE_NAME] &&
821 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
822 continue;
823
824 ctx->table = table;
825
826 err = nft_flush_table(ctx);
827 if (err < 0)
828 goto out;
829 }
830 }
831out:
832 return err;
833}
834
633c9a84
PNA		 835static int nf_tables_deltable(struct net *net, struct sock *nlsk,
836 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 837 const struct nlattr * const nla[])
838{
839 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 840 u8 genmask = nft_genmask_next(net);
96518518
PM		 841 struct nft_af_info *afi;
842 struct nft_table *table;
ee01d542 843 int family = nfmsg->nfgen_family;
55dd6f93 844 struct nft_ctx ctx;
96518518 845
633c9a84 846 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 847 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
848 return nft_flush(&ctx, family);
849
99633ab2 850 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 851 if (IS_ERR(afi))
852 return PTR_ERR(afi);
853
f2a6d766 854 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 855 if (IS_ERR(table))
856 return PTR_ERR(table);
96518518 857
b9ac12ef
AB		 858 ctx.afi = afi;
859 ctx.table = table;
55dd6f93 860
b9ac12ef 861 return nft_flush_table(&ctx);
96518518
PM		 862}
863
55dd6f93
PNA		 864static void nf_tables_table_destroy(struct nft_ctx *ctx)
865{
4fefee57
PNA		 866 BUG_ON(ctx->table->use > 0);
867
55dd6f93
PNA		 868 kfree(ctx->table);
869 module_put(ctx->afi->owner);
870}
871
2a37d755 872int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 873{
9370761c 874 int err = 0;
96518518
PM		 875
876 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 877 if (chain_type[ctype->family][ctype->type] != NULL) {
878 err = -EBUSY;
879 goto out;
96518518 880 }
9370761c
PNA		 881 chain_type[ctype->family][ctype->type] = ctype;
882out:
96518518
PM		 883 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
884 return err;
885}
9370761c 886EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 887
2a37d755 888void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 889{
96518518 890 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 891 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 892 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
893}
9370761c 894EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 895
896/*
897 * Chains
898 */
899
900static struct nft_chain *
664b0f8c
PNA		 901nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
902 u8 genmask)
96518518
PM		 903{
904 struct nft_chain *chain;
905
906 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 907 if (chain->handle == handle &&
908 nft_active_genmask(chain, genmask))
96518518
PM		 909 return chain;
910 }
911
912 return ERR_PTR(-ENOENT);
913}
914
915static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
664b0f8c
PNA		 916 const struct nlattr *nla,
917 u8 genmask)
96518518
PM		 918{
919 struct nft_chain *chain;
920
921 if (nla == NULL)
922 return ERR_PTR(-EINVAL);
923
924 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 925 if (!nla_strcmp(nla, chain->name) &&
926 nft_active_genmask(chain, genmask))
96518518
PM		 927 return chain;
928 }
929
930 return ERR_PTR(-ENOENT);
931}
932
933static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 934 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
935 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 936 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
937 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
938 .len = NFT_CHAIN_MAXNAMELEN - 1 },
939 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 940 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 941 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 942 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 943};
944
945static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
946 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
947 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 948 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
949 .len = IFNAMSIZ - 1 },
96518518
PM		 950};
951
0ca743a5
PNA		 952static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
953{
954 struct nft_stats *cpu_stats, total;
955 struct nlattr *nest;
ce355e20
ED		 956 unsigned int seq;
957 u64 pkts, bytes;
0ca743a5
PNA		 958 int cpu;
959
960 memset(&total, 0, sizeof(total));
961 for_each_possible_cpu(cpu) {
962 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 963 do {
964 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
965 pkts = cpu_stats->pkts;
966 bytes = cpu_stats->bytes;
967 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
968 total.pkts += pkts;
969 total.bytes += bytes;
0ca743a5
PNA		 970 }
971 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
972 if (nest == NULL)
973 goto nla_put_failure;
974
b46f6ded
ND		 975 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
976 NFTA_COUNTER_PAD) ||
977 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
978 NFTA_COUNTER_PAD))
0ca743a5
PNA		 979 goto nla_put_failure;
980
981 nla_nest_end(skb, nest);
982 return 0;
983
984nla_put_failure:
985 return -ENOSPC;
986}
987
84d7fce6
PNA		 988static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
989 u32 portid, u32 seq, int event, u32 flags,
990 int family, const struct nft_table *table,
96518518
PM		 991 const struct nft_chain *chain)
992{
993 struct nlmsghdr *nlh;
994 struct nfgenmsg *nfmsg;
995
996 event |= NFNL_SUBSYS_NFTABLES << 8;
997 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
998 if (nlh == NULL)
999 goto nla_put_failure;
1000
1001 nfmsg = nlmsg_data(nlh);
1002 nfmsg->nfgen_family = family;
1003 nfmsg->version = NFNETLINK_V0;
84d7fce6 1004 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1005
1006 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1007 goto nla_put_failure;
b46f6ded
ND		 1008 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1009 NFTA_CHAIN_PAD))
96518518
PM		 1010 goto nla_put_failure;
1011 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1012 goto nla_put_failure;
1013
1014 if (chain->flags & NFT_BASE_CHAIN) {
0ca743a5 1015 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 1016 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 1017 struct nlattr *nest;
1018
1019 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 1020 if (nest == NULL)
1021 goto nla_put_failure;
1022 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1023 goto nla_put_failure;
1024 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1025 goto nla_put_failure;
2cbce139
PNA		 1026 if (basechain->dev_name[0] &&
1027 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1028 goto nla_put_failure;
96518518 1029 nla_nest_end(skb, nest);
9370761c 1030
0ca743a5
PNA		 1031 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1032 htonl(basechain->policy)))
1033 goto nla_put_failure;
1034
baae3e62
PM		 1035 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1036 goto nla_put_failure;
0ca743a5
PNA		 1037
1038 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1039 goto nla_put_failure;
96518518
PM		 1040 }
1041
0ca743a5
PNA		 1042 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1043 goto nla_put_failure;
1044
053c095a
JB		 1045 nlmsg_end(skb, nlh);
1046 return 0;
96518518
PM		 1047
1048nla_put_failure:
1049 nlmsg_trim(skb, nlh);
1050 return -1;
1051}
1052
35151d84 1053static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1054{
1055 struct sk_buff *skb;
96518518
PM		 1056 int err;
1057
128ad332
PNA		 1058 if (!ctx->report &&
1059 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1060 return 0;
1061
1062 err = -ENOBUFS;
1063 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1064 if (skb == NULL)
1065 goto err;
1066
84d7fce6
PNA		 1067 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1068 event, 0, ctx->afi->family, ctx->table,
35151d84 1069 ctx->chain);
96518518
PM		 1070 if (err < 0) {
1071 kfree_skb(skb);
1072 goto err;
1073 }
1074
128ad332
PNA		 1075 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1076 ctx->report, GFP_KERNEL);
96518518 1077err:
128ad332
PNA		 1078 if (err < 0) {
1079 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1080 err);
1081 }
96518518
PM		 1082 return err;
1083}
1084
1085static int nf_tables_dump_chains(struct sk_buff *skb,
1086 struct netlink_callback *cb)
1087{
1088 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1089 const struct nft_af_info *afi;
1090 const struct nft_table *table;
1091 const struct nft_chain *chain;
1092 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1093 struct net *net = sock_net(skb->sk);
96518518
PM		 1094 int family = nfmsg->nfgen_family;
1095
e688a7f8 1096 rcu_read_lock();
38e029f1
PNA		 1097 cb->seq = net->nft.base_seq;
1098
e688a7f8 1099 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1100 if (family != NFPROTO_UNSPEC && family != afi->family)
1101 continue;
1102
e688a7f8
PNA		 1103 list_for_each_entry_rcu(table, &afi->tables, list) {
1104 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1105 if (idx < s_idx)
1106 goto cont;
1107 if (idx > s_idx)
1108 memset(&cb->args[1], 0,
1109 sizeof(cb->args) - sizeof(cb->args[0]));
664b0f8c
PNA		 1110 if (!nft_is_active(net, chain))
1111 continue;
84d7fce6
PNA		 1112 if (nf_tables_fill_chain_info(skb, net,
1113 NETLINK_CB(cb->skb).portid,
96518518
PM		 1114 cb->nlh->nlmsg_seq,
1115 NFT_MSG_NEWCHAIN,
1116 NLM_F_MULTI,
1117 afi->family, table, chain) < 0)
1118 goto done;
38e029f1
PNA		 1119
1120 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1121cont:
1122 idx++;
1123 }
1124 }
1125 }
1126done:
e688a7f8 1127 rcu_read_unlock();
96518518
PM		 1128 cb->args[0] = idx;
1129 return skb->len;
1130}
1131
7b8002a1
PNA		 1132static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1133 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1134 const struct nlattr * const nla[])
1135{
1136 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1137 u8 genmask = nft_genmask_cur(net);
96518518
PM		 1138 const struct nft_af_info *afi;
1139 const struct nft_table *table;
1140 const struct nft_chain *chain;
1141 struct sk_buff *skb2;
1142 int family = nfmsg->nfgen_family;
1143 int err;
1144
1145 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1146 struct netlink_dump_control c = {
1147 .dump = nf_tables_dump_chains,
1148 };
1149 return netlink_dump_start(nlsk, skb, nlh, &c);
1150 }
1151
99633ab2 1152 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1153 if (IS_ERR(afi))
1154 return PTR_ERR(afi);
1155
f2a6d766 1156 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1157 if (IS_ERR(table))
1158 return PTR_ERR(table);
1159
664b0f8c 1160 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1161 if (IS_ERR(chain))
1162 return PTR_ERR(chain);
1163
1164 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1165 if (!skb2)
1166 return -ENOMEM;
1167
84d7fce6 1168 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1169 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1170 family, table, chain);
1171 if (err < 0)
1172 goto err;
1173
1174 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1175
1176err:
1177 kfree_skb(skb2);
1178 return err;
1179}
1180
0ca743a5
PNA		 1181static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1182 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1183 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1184};
1185
ff3cd7b3 1186static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1187{
1188 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1189 struct nft_stats __percpu *newstats;
1190 struct nft_stats *stats;
1191 int err;
1192
1193 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
1194 if (err < 0)
ff3cd7b3 1195 return ERR_PTR(err);
0ca743a5
PNA		 1196
1197 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1198 return ERR_PTR(-EINVAL);
0ca743a5 1199
ce355e20 1200 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1201 if (newstats == NULL)
ff3cd7b3 1202 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1203
1204 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1205 * are not exposed to userspace.
1206 */
e8781f70 1207 preempt_disable();
0ca743a5
PNA		 1208 stats = this_cpu_ptr(newstats);
1209 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1210 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1211 preempt_enable();
0ca743a5 1212
ff3cd7b3
PNA		 1213 return newstats;
1214}
1215
1216static void nft_chain_stats_replace(struct nft_base_chain *chain,
1217 struct nft_stats __percpu *newstats)
1218{
b88825de
PNA		 1219 if (newstats == NULL)
1220 return;
1221
0ca743a5 1222 if (chain->stats) {
0ca743a5 1223 struct nft_stats __percpu *oldstats =
67a8fc27 1224 nft_dereference(chain->stats);
0ca743a5
PNA		 1225
1226 rcu_assign_pointer(chain->stats, newstats);
1227 synchronize_rcu();
1228 free_percpu(oldstats);
1229 } else
1230 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1231}
1232
91c7b38d
PNA		 1233static void nf_tables_chain_destroy(struct nft_chain *chain)
1234{
1235 BUG_ON(chain->use > 0);
1236
1237 if (chain->flags & NFT_BASE_CHAIN) {
2cbce139
PNA		 1238 struct nft_base_chain *basechain = nft_base_chain(chain);
1239
1240 module_put(basechain->type->owner);
1241 free_percpu(basechain->stats);
1242 if (basechain->ops[0].dev != NULL)
1243 dev_put(basechain->ops[0].dev);
1244 kfree(basechain);
91c7b38d
PNA		 1245 } else {
1246 kfree(chain);
1247 }
1248}
1249
508f8ccd
PNA		 1250struct nft_chain_hook {
1251 u32 num;
1252 u32 priority;
1253 const struct nf_chain_type *type;
1254 struct net_device *dev;
1255};
1256
1257static int nft_chain_parse_hook(struct net *net,
1258 const struct nlattr * const nla[],
1259 struct nft_af_info *afi,
1260 struct nft_chain_hook *hook, bool create)
1261{
1262 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1263 const struct nf_chain_type *type;
1264 struct net_device *dev;
1265 int err;
1266
1267 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1268 nft_hook_policy);
1269 if (err < 0)
1270 return err;
1271
1272 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1273 ha[NFTA_HOOK_PRIORITY] == NULL)
1274 return -EINVAL;
1275
1276 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1277 if (hook->num >= afi->nhooks)
1278 return -EINVAL;
1279
1280 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1281
1282 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1283 if (nla[NFTA_CHAIN_TYPE]) {
1284 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1285 create);
1286 if (IS_ERR(type))
1287 return PTR_ERR(type);
1288 }
1289 if (!(type->hook_mask & (1 << hook->num)))
1290 return -EOPNOTSUPP;
1291 if (!try_module_get(type->owner))
1292 return -ENOENT;
1293
1294 hook->type = type;
1295
1296 hook->dev = NULL;
1297 if (afi->flags & NFT_AF_NEEDS_DEV) {
1298 char ifname[IFNAMSIZ];
1299
1300 if (!ha[NFTA_HOOK_DEV]) {
1301 module_put(type->owner);
1302 return -EOPNOTSUPP;
1303 }
1304
1305 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1306 dev = dev_get_by_name(net, ifname);
1307 if (!dev) {
1308 module_put(type->owner);
1309 return -ENOENT;
1310 }
1311 hook->dev = dev;
1312 } else if (ha[NFTA_HOOK_DEV]) {
1313 module_put(type->owner);
1314 return -EOPNOTSUPP;
1315 }
1316
1317 return 0;
1318}
1319
1320static void nft_chain_release_hook(struct nft_chain_hook *hook)
1321{
1322 module_put(hook->type->owner);
1323 if (hook->dev != NULL)
1324 dev_put(hook->dev);
1325}
1326
633c9a84
PNA		 1327static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1328 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1329 const struct nlattr * const nla[])
1330{
1331 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1332 const struct nlattr * uninitialized_var(name);
7c95f6d8 1333 struct nft_af_info *afi;
96518518
PM		 1334 struct nft_table *table;
1335 struct nft_chain *chain;
0ca743a5 1336 struct nft_base_chain *basechain = NULL;
f2a6d766 1337 u8 genmask = nft_genmask_next(net);
96518518 1338 int family = nfmsg->nfgen_family;
57de2a0c 1339 u8 policy = NF_ACCEPT;
96518518 1340 u64 handle = 0;
115a60b1 1341 unsigned int i;
ff3cd7b3 1342 struct nft_stats __percpu *stats;
96518518
PM		 1343 int err;
1344 bool create;
91c7b38d 1345 struct nft_ctx ctx;
96518518
PM		 1346
1347 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1348
99633ab2 1349 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1350 if (IS_ERR(afi))
1351 return PTR_ERR(afi);
1352
f2a6d766 1353 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1354 if (IS_ERR(table))
1355 return PTR_ERR(table);
1356
96518518
PM		 1357 chain = NULL;
1358 name = nla[NFTA_CHAIN_NAME];
1359
1360 if (nla[NFTA_CHAIN_HANDLE]) {
1361 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1362 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1363 if (IS_ERR(chain))
1364 return PTR_ERR(chain);
1365 } else {
664b0f8c 1366 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1367 if (IS_ERR(chain)) {
1368 if (PTR_ERR(chain) != -ENOENT)
1369 return PTR_ERR(chain);
1370 chain = NULL;
1371 }
1372 }
1373
57de2a0c
PM		 1374 if (nla[NFTA_CHAIN_POLICY]) {
1375 if ((chain != NULL &&
d6b6cb1d
PNA		 1376 !(chain->flags & NFT_BASE_CHAIN)))
1377 return -EOPNOTSUPP;
1378
1379 if (chain == NULL &&
57de2a0c
PM		 1380 nla[NFTA_CHAIN_HOOK] == NULL)
1381 return -EOPNOTSUPP;
1382
8f46df18 1383 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1384 switch (policy) {
1385 case NF_DROP:
1386 case NF_ACCEPT:
1387 break;
1388 default:
1389 return -EINVAL;
1390 }
1391 }
1392
96518518 1393 if (chain != NULL) {
91c7b38d
PNA		 1394 struct nft_stats *stats = NULL;
1395 struct nft_trans *trans;
1396
96518518
PM		 1397 if (nlh->nlmsg_flags & NLM_F_EXCL)
1398 return -EEXIST;
1399 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1400 return -EOPNOTSUPP;
1401
6133740d
PNA		 1402 if (nla[NFTA_CHAIN_HOOK]) {
1403 struct nft_base_chain *basechain;
1404 struct nft_chain_hook hook;
1405 struct nf_hook_ops *ops;
1406
1407 if (!(chain->flags & NFT_BASE_CHAIN))
1408 return -EBUSY;
1409
1410 err = nft_chain_parse_hook(net, nla, afi, &hook,
1411 create);
1412 if (err < 0)
1413 return err;
1414
1415 basechain = nft_base_chain(chain);
1416 if (basechain->type != hook.type) {
1417 nft_chain_release_hook(&hook);
1418 return -EBUSY;
1419 }
1420
1421 for (i = 0; i < afi->nops; i++) {
1422 ops = &basechain->ops[i];
1423 if (ops->hooknum != hook.num ||
1424 ops->priority != hook.priority ||
1425 ops->dev != hook.dev) {
1426 nft_chain_release_hook(&hook);
1427 return -EBUSY;
1428 }
1429 }
1430 nft_chain_release_hook(&hook);
1431 }
1432
664b0f8c
PNA		 1433 if (nla[NFTA_CHAIN_HANDLE] && name) {
1434 struct nft_chain *chain2;
1435
1436 chain2 = nf_tables_chain_lookup(table,
1437 nla[NFTA_CHAIN_NAME],
1438 genmask);
1439 if (IS_ERR(chain2))
1440 return PTR_ERR(chain2);
1441 }
96518518 1442
0ca743a5
PNA		 1443 if (nla[NFTA_CHAIN_COUNTERS]) {
1444 if (!(chain->flags & NFT_BASE_CHAIN))
1445 return -EOPNOTSUPP;
1446
ff3cd7b3
PNA		 1447 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1448 if (IS_ERR(stats))
1449 return PTR_ERR(stats);
0ca743a5
PNA		 1450 }
1451
633c9a84 1452 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1453 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1454 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1455 if (trans == NULL) {
1456 free_percpu(stats);
91c7b38d 1457 return -ENOMEM;
f5553c19 1458 }
4401a862 1459
91c7b38d
PNA		 1460 nft_trans_chain_stats(trans) = stats;
1461 nft_trans_chain_update(trans) = true;
4401a862 1462
91c7b38d
PNA		 1463 if (nla[NFTA_CHAIN_POLICY])
1464 nft_trans_chain_policy(trans) = policy;
1465 else
1466 nft_trans_chain_policy(trans) = -1;
96518518 1467
91c7b38d
PNA		 1468 if (nla[NFTA_CHAIN_HANDLE] && name) {
1469 nla_strlcpy(nft_trans_chain_name(trans), name,
1470 NFT_CHAIN_MAXNAMELEN);
1471 }
1472 list_add_tail(&trans->list, &net->nft.commit_list);
1473 return 0;
96518518
PM		 1474 }
1475
75820676
PM		 1476 if (table->use == UINT_MAX)
1477 return -EOVERFLOW;
1478
96518518 1479 if (nla[NFTA_CHAIN_HOOK]) {
508f8ccd 1480 struct nft_chain_hook hook;
96518518 1481 struct nf_hook_ops *ops;
9370761c 1482 nf_hookfn *hookfn;
96518518 1483
508f8ccd 1484 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
96518518
PM		 1485 if (err < 0)
1486 return err;
2cbce139 1487
96518518 1488 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19 1489 if (basechain == NULL) {
508f8ccd 1490 nft_chain_release_hook(&hook);
96518518 1491 return -ENOMEM;
f5553c19 1492 }
9370761c 1493
508f8ccd
PNA		 1494 if (hook.dev != NULL)
1495 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
2cbce139 1496
4401a862 1497 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1498 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1499 if (IS_ERR(stats)) {
508f8ccd 1500 nft_chain_release_hook(&hook);
4401a862 1501 kfree(basechain);
ff3cd7b3 1502 return PTR_ERR(stats);
4401a862 1503 }
ff3cd7b3 1504 basechain->stats = stats;
4401a862 1505 } else {
ce355e20 1506 stats = netdev_alloc_pcpu_stats(struct nft_stats);
c123bb71 1507 if (stats == NULL) {
508f8ccd 1508 nft_chain_release_hook(&hook);
4401a862 1509 kfree(basechain);
c123bb71 1510 return -ENOMEM;
4401a862 1511 }
ff3cd7b3 1512 rcu_assign_pointer(basechain->stats, stats);
4401a862
PM		 1513 }
1514
508f8ccd
PNA		 1515 hookfn = hook.type->hooks[hook.num];
1516 basechain->type = hook.type;
96518518
PM		 1517 chain = &basechain->chain;
1518
115a60b1
PM		 1519 for (i = 0; i < afi->nops; i++) {
1520 ops = &basechain->ops[i];
1521 ops->pf = family;
508f8ccd
PNA		 1522 ops->hooknum = hook.num;
1523 ops->priority = hook.priority;
115a60b1
PM		 1524 ops->priv = chain;
1525 ops->hook = afi->hooks[ops->hooknum];
508f8ccd 1526 ops->dev = hook.dev;
115a60b1
PM		 1527 if (hookfn)
1528 ops->hook = hookfn;
1529 if (afi->hook_ops_init)
1530 afi->hook_ops_init(ops, i);
1531 }
96518518
PM		 1532
1533 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1534 basechain->policy = policy;
96518518
PM		 1535 } else {
1536 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1537 if (chain == NULL)
1538 return -ENOMEM;
1539 }
1540
1541 INIT_LIST_HEAD(&chain->rules);
1542 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1543 chain->table = table;
96518518
PM		 1544 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1545
82bec71d 1546 err = nf_tables_register_hooks(net, table, chain, afi->nops);
d8ee8f7c
PNA		 1547 if (err < 0)
1548 goto err1;
96518518 1549
633c9a84 1550 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1551 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1552 if (err < 0)
1553 goto err2;
96518518 1554
4fefee57 1555 table->use++;
e688a7f8 1556 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1557 return 0;
1558err2:
82bec71d 1559 nf_tables_unregister_hooks(net, table, chain, afi->nops);
91c7b38d
PNA		 1560err1:
1561 nf_tables_chain_destroy(chain);
1562 return err;
96518518
PM		 1563}
1564
633c9a84
PNA		 1565static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1566 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 1567 const struct nlattr * const nla[])
1568{
1569 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1570 u8 genmask = nft_genmask_next(net);
7c95f6d8 1571 struct nft_af_info *afi;
96518518
PM		 1572 struct nft_table *table;
1573 struct nft_chain *chain;
1574 int family = nfmsg->nfgen_family;
91c7b38d 1575 struct nft_ctx ctx;
96518518 1576
99633ab2 1577 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1578 if (IS_ERR(afi))
1579 return PTR_ERR(afi);
1580
f2a6d766 1581 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1582 if (IS_ERR(table))
1583 return PTR_ERR(table);
1584
664b0f8c 1585 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1586 if (IS_ERR(chain))
1587 return PTR_ERR(chain);
4fefee57 1588 if (chain->use > 0)
96518518
PM		 1589 return -EBUSY;
1590
633c9a84 1591 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1592
ee01d542 1593 return nft_delchain(&ctx);
96518518
PM		 1594}
1595
96518518
PM		 1596/*
1597 * Expressions
1598 */
1599
1600/**
ef1f7df9
PM		 1601 * nft_register_expr - register nf_tables expr type
1602 * @ops: expr type
96518518 1603 *
ef1f7df9 1604 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1605 * success or a negative errno code otherwise.
1606 */
ef1f7df9 1607int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1608{
1609 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1610 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1611 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1612 else
e688a7f8 1613 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1614 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1615 return 0;
1616}
1617EXPORT_SYMBOL_GPL(nft_register_expr);
1618
1619/**
ef1f7df9
PM		 1620 * nft_unregister_expr - unregister nf_tables expr type
1621 * @ops: expr type
96518518 1622 *
ef1f7df9 1623 * Unregisters the expr typefor use with nf_tables.
96518518 1624 */
ef1f7df9 1625void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1626{
1627 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1628 list_del_rcu(&type->list);
96518518
PM		 1629 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1630}
1631EXPORT_SYMBOL_GPL(nft_unregister_expr);
1632
64d46806
PM		 1633static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1634 struct nlattr *nla)
96518518 1635{
ef1f7df9 1636 const struct nft_expr_type *type;
96518518 1637
ef1f7df9 1638 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1639 if (!nla_strcmp(nla, type->name) &&
1640 (!type->family || type->family == family))
ef1f7df9 1641 return type;
96518518
PM		 1642 }
1643 return NULL;
1644}
1645
64d46806
PM		 1646static const struct nft_expr_type *nft_expr_type_get(u8 family,
1647 struct nlattr *nla)
96518518 1648{
ef1f7df9 1649 const struct nft_expr_type *type;
96518518
PM		 1650
1651 if (nla == NULL)
1652 return ERR_PTR(-EINVAL);
1653
64d46806 1654 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1655 if (type != NULL && try_module_get(type->owner))
1656 return type;
96518518
PM		 1657
1658#ifdef CONFIG_MODULES
ef1f7df9 1659 if (type == NULL) {
64d46806
PM		 1660 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1661 request_module("nft-expr-%u-%.*s", family,
1662 nla_len(nla), (char *)nla_data(nla));
1663 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1664 if (__nft_expr_type_get(family, nla))
1665 return ERR_PTR(-EAGAIN);
1666
96518518
PM		 1667 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1668 request_module("nft-expr-%.*s",
1669 nla_len(nla), (char *)nla_data(nla));
1670 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1671 if (__nft_expr_type_get(family, nla))
96518518
PM		 1672 return ERR_PTR(-EAGAIN);
1673 }
1674#endif
1675 return ERR_PTR(-ENOENT);
1676}
1677
1678static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1679 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1680 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1681};
1682
1683static int nf_tables_fill_expr_info(struct sk_buff *skb,
1684 const struct nft_expr *expr)
1685{
ef1f7df9 1686 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1687 goto nla_put_failure;
1688
1689 if (expr->ops->dump) {
1690 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1691 if (data == NULL)
1692 goto nla_put_failure;
1693 if (expr->ops->dump(skb, expr) < 0)
1694 goto nla_put_failure;
1695 nla_nest_end(skb, data);
1696 }
1697
1698 return skb->len;
1699
1700nla_put_failure:
1701 return -1;
1702};
1703
0b2d8a7b
PM		 1704int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1705 const struct nft_expr *expr)
1706{
1707 struct nlattr *nest;
1708
1709 nest = nla_nest_start(skb, attr);
1710 if (!nest)
1711 goto nla_put_failure;
1712 if (nf_tables_fill_expr_info(skb, expr) < 0)
1713 goto nla_put_failure;
1714 nla_nest_end(skb, nest);
1715 return 0;
1716
1717nla_put_failure:
1718 return -1;
1719}
1720
96518518
PM		 1721struct nft_expr_info {
1722 const struct nft_expr_ops *ops;
ef1f7df9 1723 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1724};
1725
0ca743a5
PNA		 1726static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1727 const struct nlattr *nla,
96518518
PM		 1728 struct nft_expr_info *info)
1729{
ef1f7df9 1730 const struct nft_expr_type *type;
96518518 1731 const struct nft_expr_ops *ops;
ef1f7df9 1732 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1733 int err;
1734
ef1f7df9 1735 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
96518518
PM		 1736 if (err < 0)
1737 return err;
1738
64d46806 1739 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1740 if (IS_ERR(type))
1741 return PTR_ERR(type);
1742
1743 if (tb[NFTA_EXPR_DATA]) {
1744 err = nla_parse_nested(info->tb, type->maxattr,
1745 tb[NFTA_EXPR_DATA], type->policy);
1746 if (err < 0)
1747 goto err1;
1748 } else
1749 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1750
1751 if (type->select_ops != NULL) {
0ca743a5
PNA		 1752 ops = type->select_ops(ctx,
1753 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1754 if (IS_ERR(ops)) {
1755 err = PTR_ERR(ops);
1756 goto err1;
1757 }
1758 } else
1759 ops = type->ops;
1760
96518518
PM		 1761 info->ops = ops;
1762 return 0;
ef1f7df9
PM		 1763
1764err1:
1765 module_put(type->owner);
1766 return err;
96518518
PM		 1767}
1768
1769static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1770 const struct nft_expr_info *info,
96518518
PM		 1771 struct nft_expr *expr)
1772{
1773 const struct nft_expr_ops *ops = info->ops;
1774 int err;
1775
1776 expr->ops = ops;
1777 if (ops->init) {
ef1f7df9 1778 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1779 if (err < 0)
1780 goto err1;
1781 }
1782
96518518
PM		 1783 return 0;
1784
1785err1:
1786 expr->ops = NULL;
1787 return err;
1788}
1789
62472bce
PM		 1790static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1791 struct nft_expr *expr)
96518518
PM		 1792{
1793 if (expr->ops->destroy)
62472bce 1794 expr->ops->destroy(ctx, expr);
ef1f7df9 1795 module_put(expr->ops->type->owner);
96518518
PM		 1796}
1797
0b2d8a7b
PM		 1798struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1799 const struct nlattr *nla)
1800{
1801 struct nft_expr_info info;
1802 struct nft_expr *expr;
1803 int err;
1804
1805 err = nf_tables_expr_parse(ctx, nla, &info);
1806 if (err < 0)
1807 goto err1;
1808
1809 err = -ENOMEM;
1810 expr = kzalloc(info.ops->size, GFP_KERNEL);
1811 if (expr == NULL)
1812 goto err2;
1813
1814 err = nf_tables_newexpr(ctx, &info, expr);
1815 if (err < 0)
6cafaf47 1816 goto err3;
0b2d8a7b
PM		 1817
1818 return expr;
6cafaf47
LZ		 1819err3:
1820 kfree(expr);
0b2d8a7b
PM		 1821err2:
1822 module_put(info.ops->type->owner);
1823err1:
1824 return ERR_PTR(err);
1825}
1826
1827void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1828{
1829 nf_tables_expr_destroy(ctx, expr);
1830 kfree(expr);
1831}
1832
96518518
PM		 1833/*
1834 * Rules
1835 */
1836
1837static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1838 u64 handle)
1839{
1840 struct nft_rule *rule;
1841
1842 // FIXME: this sucks
1843 list_for_each_entry(rule, &chain->rules, list) {
1844 if (handle == rule->handle)
1845 return rule;
1846 }
1847
1848 return ERR_PTR(-ENOENT);
1849}
1850
1851static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1852 const struct nlattr *nla)
1853{
1854 if (nla == NULL)
1855 return ERR_PTR(-EINVAL);
1856
1857 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1858}
1859
1860static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 1861 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1862 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1863 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1864 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1865 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1866 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1867 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1868 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1869 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1870 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1871};
1872
84d7fce6
PNA		 1873static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1874 u32 portid, u32 seq, int event,
1875 u32 flags, int family,
96518518
PM		 1876 const struct nft_table *table,
1877 const struct nft_chain *chain,
1878 const struct nft_rule *rule)
1879{
1880 struct nlmsghdr *nlh;
1881 struct nfgenmsg *nfmsg;
1882 const struct nft_expr *expr, *next;
1883 struct nlattr *list;
5e948466
EL		 1884 const struct nft_rule *prule;
1885 int type = event | NFNL_SUBSYS_NFTABLES << 8;
96518518 1886
5e948466 1887 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
96518518
PM		 1888 flags);
1889 if (nlh == NULL)
1890 goto nla_put_failure;
1891
1892 nfmsg = nlmsg_data(nlh);
1893 nfmsg->nfgen_family = family;
1894 nfmsg->version = NFNETLINK_V0;
84d7fce6 1895 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1896
1897 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1898 goto nla_put_failure;
1899 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1900 goto nla_put_failure;
b46f6ded
ND		 1901 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1902 NFTA_RULE_PAD))
96518518
PM		 1903 goto nla_put_failure;
1904
5e948466
EL		 1905 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1906 prule = list_entry(rule->list.prev, struct nft_rule, list);
1907 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1908 cpu_to_be64(prule->handle),
1909 NFTA_RULE_PAD))
5e948466
EL		 1910 goto nla_put_failure;
1911 }
1912
96518518
PM		 1913 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1914 if (list == NULL)
1915 goto nla_put_failure;
1916 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1917 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1918 goto nla_put_failure;
96518518
PM		 1919 }
1920 nla_nest_end(skb, list);
1921
86f1ec32
PM		 1922 if (rule->udata) {
1923 struct nft_userdata *udata = nft_userdata(rule);
1924 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1925 udata->data) < 0)
1926 goto nla_put_failure;
1927 }
0768b3b3 1928
053c095a
JB		 1929 nlmsg_end(skb, nlh);
1930 return 0;
96518518
PM		 1931
1932nla_put_failure:
1933 nlmsg_trim(skb, nlh);
1934 return -1;
1935}
1936
35151d84 1937static int nf_tables_rule_notify(const struct nft_ctx *ctx,
96518518 1938 const struct nft_rule *rule,
35151d84 1939 int event)
96518518
PM		 1940{
1941 struct sk_buff *skb;
96518518
PM		 1942 int err;
1943
128ad332
PNA		 1944 if (!ctx->report &&
1945 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
96518518
PM		 1946 return 0;
1947
1948 err = -ENOBUFS;
1949 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1950 if (skb == NULL)
1951 goto err;
1952
84d7fce6
PNA		 1953 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1954 event, 0, ctx->afi->family, ctx->table,
35151d84 1955 ctx->chain, rule);
96518518
PM		 1956 if (err < 0) {
1957 kfree_skb(skb);
1958 goto err;
1959 }
1960
128ad332
PNA		 1961 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1962 ctx->report, GFP_KERNEL);
96518518 1963err:
128ad332
PNA		 1964 if (err < 0) {
1965 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1966 err);
1967 }
96518518
PM		 1968 return err;
1969}
1970
6e1f760e
PNA		 1971struct nft_rule_dump_ctx {
1972 char table[NFT_TABLE_MAXNAMELEN];
1973 char chain[NFT_CHAIN_MAXNAMELEN];
1974};
1975
96518518
PM		 1976static int nf_tables_dump_rules(struct sk_buff *skb,
1977 struct netlink_callback *cb)
1978{
1979 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 1980 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 1981 const struct nft_af_info *afi;
1982 const struct nft_table *table;
1983 const struct nft_chain *chain;
1984 const struct nft_rule *rule;
1985 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1986 struct net *net = sock_net(skb->sk);
96518518
PM		 1987 int family = nfmsg->nfgen_family;
1988
e688a7f8 1989 rcu_read_lock();
38e029f1
PNA		 1990 cb->seq = net->nft.base_seq;
1991
e688a7f8 1992 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1993 if (family != NFPROTO_UNSPEC && family != afi->family)
1994 continue;
1995
e688a7f8 1996 list_for_each_entry_rcu(table, &afi->tables, list) {
6e1f760e
PNA		 1997 if (ctx && ctx->table[0] &&
1998 strcmp(ctx->table, table->name) != 0)
1999 continue;
2000
e688a7f8 2001 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 2002 if (ctx && ctx->chain[0] &&
2003 strcmp(ctx->chain, chain->name) != 0)
2004 continue;
2005
e688a7f8 2006 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2007 if (!nft_is_active(net, rule))
0628b123 2008 goto cont;
96518518
PM		 2009 if (idx < s_idx)
2010 goto cont;
2011 if (idx > s_idx)
2012 memset(&cb->args[1], 0,
2013 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2014 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2015 cb->nlh->nlmsg_seq,
2016 NFT_MSG_NEWRULE,
2017 NLM_F_MULTI | NLM_F_APPEND,
2018 afi->family, table, chain, rule) < 0)
2019 goto done;
38e029f1
PNA		 2020
2021 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2022cont:
2023 idx++;
2024 }
2025 }
2026 }
2027 }
2028done:
e688a7f8
PNA		 2029 rcu_read_unlock();
2030
96518518
PM		 2031 cb->args[0] = idx;
2032 return skb->len;
2033}
2034
6e1f760e
PNA		 2035static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2036{
2037 kfree(cb->data);
2038 return 0;
2039}
2040
7b8002a1
PNA		 2041static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2042 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2043 const struct nlattr * const nla[])
2044{
2045 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2046 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2047 const struct nft_af_info *afi;
2048 const struct nft_table *table;
2049 const struct nft_chain *chain;
2050 const struct nft_rule *rule;
2051 struct sk_buff *skb2;
2052 int family = nfmsg->nfgen_family;
2053 int err;
2054
2055 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2056 struct netlink_dump_control c = {
2057 .dump = nf_tables_dump_rules,
6e1f760e 2058 .done = nf_tables_dump_rules_done,
96518518 2059 };
6e1f760e
PNA		 2060
2061 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2062 struct nft_rule_dump_ctx *ctx;
2063
2064 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2065 if (!ctx)
2066 return -ENOMEM;
2067
2068 if (nla[NFTA_RULE_TABLE])
2069 nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
2070 sizeof(ctx->table));
2071 if (nla[NFTA_RULE_CHAIN])
2072 nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
2073 sizeof(ctx->chain));
2074 c.data = ctx;
2075 }
2076
96518518
PM		 2077 return netlink_dump_start(nlsk, skb, nlh, &c);
2078 }
2079
99633ab2 2080 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2081 if (IS_ERR(afi))
2082 return PTR_ERR(afi);
2083
f2a6d766 2084 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2085 if (IS_ERR(table))
2086 return PTR_ERR(table);
2087
664b0f8c 2088 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2089 if (IS_ERR(chain))
2090 return PTR_ERR(chain);
2091
2092 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2093 if (IS_ERR(rule))
2094 return PTR_ERR(rule);
2095
2096 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2097 if (!skb2)
2098 return -ENOMEM;
2099
84d7fce6 2100 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2101 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2102 family, table, chain, rule);
2103 if (err < 0)
2104 goto err;
2105
2106 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2107
2108err:
2109 kfree_skb(skb2);
2110 return err;
2111}
2112
62472bce
PM		 2113static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2114 struct nft_rule *rule)
96518518 2115{
96518518
PM		 2116 struct nft_expr *expr;
2117
2118 /*
2119 * Careful: some expressions might not be initialized in case this
2120 * is called on error from nf_tables_newrule().
2121 */
2122 expr = nft_expr_first(rule);
3e38df13 2123 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2124 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2125 expr = nft_expr_next(expr);
2126 }
2127 kfree(rule);
2128}
2129
1081d11b
PNA		 2130#define NFT_RULE_MAXEXPRS 128
2131
2132static struct nft_expr_info *info;
2133
633c9a84
PNA		 2134static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2135 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2136 const struct nlattr * const nla[])
2137{
2138 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2139 u8 genmask = nft_genmask_next(net);
7c95f6d8 2140 struct nft_af_info *afi;
96518518
PM		 2141 struct nft_table *table;
2142 struct nft_chain *chain;
2143 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2144 struct nft_userdata *udata;
1081d11b 2145 struct nft_trans *trans = NULL;
96518518
PM		 2146 struct nft_expr *expr;
2147 struct nft_ctx ctx;
2148 struct nlattr *tmp;
86f1ec32 2149 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2150 int err, rem;
2151 bool create;
5e948466 2152 u64 handle, pos_handle;
96518518
PM		 2153
2154 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2155
99633ab2 2156 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2157 if (IS_ERR(afi))
2158 return PTR_ERR(afi);
2159
f2a6d766 2160 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2161 if (IS_ERR(table))
2162 return PTR_ERR(table);
2163
664b0f8c 2164 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2165 if (IS_ERR(chain))
2166 return PTR_ERR(chain);
2167
2168 if (nla[NFTA_RULE_HANDLE]) {
2169 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2170 rule = __nf_tables_rule_lookup(chain, handle);
2171 if (IS_ERR(rule))
2172 return PTR_ERR(rule);
2173
2174 if (nlh->nlmsg_flags & NLM_F_EXCL)
2175 return -EEXIST;
2176 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2177 old_rule = rule;
2178 else
2179 return -EOPNOTSUPP;
2180 } else {
2181 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2182 return -EINVAL;
2183 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2184
2185 if (chain->use == UINT_MAX)
2186 return -EOVERFLOW;
96518518
PM		 2187 }
2188
5e948466
EL		 2189 if (nla[NFTA_RULE_POSITION]) {
2190 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2191 return -EOPNOTSUPP;
2192
2193 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2194 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2195 if (IS_ERR(old_rule))
2196 return PTR_ERR(old_rule);
2197 }
2198
633c9a84 2199 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2200
96518518
PM		 2201 n = 0;
2202 size = 0;
2203 if (nla[NFTA_RULE_EXPRESSIONS]) {
2204 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2205 err = -EINVAL;
2206 if (nla_type(tmp) != NFTA_LIST_ELEM)
2207 goto err1;
2208 if (n == NFT_RULE_MAXEXPRS)
2209 goto err1;
0ca743a5 2210 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2211 if (err < 0)
2212 goto err1;
2213 size += info[n].ops->size;
2214 n++;
2215 }
2216 }
9889840f
PM		 2217 /* Check for overflow of dlen field */
2218 err = -EFBIG;
2219 if (size >= 1 << 12)
2220 goto err1;
96518518 2221
86f1ec32 2222 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2223 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2224 if (ulen > 0)
2225 usize = sizeof(struct nft_userdata) + ulen;
2226 }
0768b3b3 2227
96518518 2228 err = -ENOMEM;
86f1ec32 2229 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2230 if (rule == NULL)
2231 goto err1;
2232
889f7ee7 2233 nft_activate_next(net, rule);
0628b123 2234
96518518
PM		 2235 rule->handle = handle;
2236 rule->dlen = size;
86f1ec32 2237 rule->udata = ulen ? 1 : 0;
0768b3b3 2238
86f1ec32
PM		 2239 if (ulen) {
2240 udata = nft_userdata(rule);
2241 udata->len = ulen - 1;
2242 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2243 }
96518518 2244
96518518
PM		 2245 expr = nft_expr_first(rule);
2246 for (i = 0; i < n; i++) {
2247 err = nf_tables_newexpr(&ctx, &info[i], expr);
2248 if (err < 0)
2249 goto err2;
ef1f7df9 2250 info[i].ops = NULL;
96518518
PM		 2251 expr = nft_expr_next(expr);
2252 }
2253
96518518 2254 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2255 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2256 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2257 old_rule);
1081d11b 2258 if (trans == NULL) {
0628b123
PNA		 2259 err = -ENOMEM;
2260 goto err2;
2261 }
889f7ee7 2262 nft_deactivate_next(net, old_rule);
ac34b861 2263 chain->use--;
5bc5c307 2264 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2265 } else {
2266 err = -ENOENT;
2267 goto err2;
2268 }
96518518 2269 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2270 if (old_rule)
2271 list_add_rcu(&rule->list, &old_rule->list);
2272 else
2273 list_add_tail_rcu(&rule->list, &chain->rules);
2274 else {
2275 if (old_rule)
2276 list_add_tail_rcu(&rule->list, &old_rule->list);
2277 else
2278 list_add_rcu(&rule->list, &chain->rules);
2279 }
96518518 2280
b380e5c7 2281 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2282 err = -ENOMEM;
2283 goto err3;
2284 }
4fefee57 2285 chain->use++;
96518518
PM		 2286 return 0;
2287
0628b123
PNA		 2288err3:
2289 list_del_rcu(&rule->list);
96518518 2290err2:
62472bce 2291 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2292err1:
2293 for (i = 0; i < n; i++) {
2294 if (info[i].ops != NULL)
ef1f7df9 2295 module_put(info[i].ops->type->owner);
96518518
PM		 2296 }
2297 return err;
2298}
2299
1a94e38d
PNA		 2300static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2301 const struct nlattr *nla)
2302{
2303 u32 id = ntohl(nla_get_be32(nla));
2304 struct nft_trans *trans;
2305
2306 list_for_each_entry(trans, &net->nft.commit_list, list) {
2307 struct nft_rule *rule = nft_trans_rule(trans);
2308
2309 if (trans->msg_type == NFT_MSG_NEWRULE &&
2310 id == nft_trans_rule_id(trans))
2311 return rule;
2312 }
2313 return ERR_PTR(-ENOENT);
2314}
2315
633c9a84
PNA		 2316static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2317 struct sk_buff *skb, const struct nlmsghdr *nlh,
96518518
PM		 2318 const struct nlattr * const nla[])
2319{
2320 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2321 u8 genmask = nft_genmask_next(net);
7c95f6d8 2322 struct nft_af_info *afi;
7c95f6d8 2323 struct nft_table *table;
cf9dc09d
PNA		 2324 struct nft_chain *chain = NULL;
2325 struct nft_rule *rule;
0628b123
PNA		 2326 int family = nfmsg->nfgen_family, err = 0;
2327 struct nft_ctx ctx;
96518518 2328
99633ab2 2329 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2330 if (IS_ERR(afi))
2331 return PTR_ERR(afi);
2332
f2a6d766 2333 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2334 if (IS_ERR(table))
2335 return PTR_ERR(table);
2336
cf9dc09d 2337 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2338 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2339 genmask);
cf9dc09d
PNA		 2340 if (IS_ERR(chain))
2341 return PTR_ERR(chain);
2342 }
96518518 2343
633c9a84 2344 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2345
cf9dc09d
PNA		 2346 if (chain) {
2347 if (nla[NFTA_RULE_HANDLE]) {
2348 rule = nf_tables_rule_lookup(chain,
2349 nla[NFTA_RULE_HANDLE]);
2350 if (IS_ERR(rule))
2351 return PTR_ERR(rule);
96518518 2352
1a94e38d
PNA		 2353 err = nft_delrule(&ctx, rule);
2354 } else if (nla[NFTA_RULE_ID]) {
2355 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2356 if (IS_ERR(rule))
2357 return PTR_ERR(rule);
2358
5e266fe7 2359 err = nft_delrule(&ctx, rule);
cf9dc09d 2360 } else {
ce24b721 2361 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2362 }
2363 } else {
2364 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2365 if (!nft_is_active_next(net, chain))
2366 continue;
2367
cf9dc09d 2368 ctx.chain = chain;
ce24b721 2369 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2370 if (err < 0)
2371 break;
2372 }
2373 }
2374
2375 return err;
2376}
2377
20a69341
PM		 2378/*
2379 * Sets
2380 */
2381
2382static LIST_HEAD(nf_tables_set_ops);
2383
2384int nft_register_set(struct nft_set_ops *ops)
2385{
2386 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2387 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
20a69341
PM		 2388 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2389 return 0;
2390}
2391EXPORT_SYMBOL_GPL(nft_register_set);
2392
2393void nft_unregister_set(struct nft_set_ops *ops)
2394{
2395 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2396 list_del_rcu(&ops->list);
20a69341
PM		 2397 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2398}
2399EXPORT_SYMBOL_GPL(nft_unregister_set);
2400
c50b960c
PM		 2401/*
2402 * Select a set implementation based on the data characteristics and the
2403 * given policy. The total memory use might not be known if no size is
2404 * given, in that case the amount of memory per element is used.
2405 */
2406static const struct nft_set_ops *
2407nft_select_set_ops(const struct nlattr * const nla[],
2408 const struct nft_set_desc *desc,
2409 enum nft_set_policies policy)
20a69341 2410{
c50b960c
PM		 2411 const struct nft_set_ops *ops, *bops;
2412 struct nft_set_estimate est, best;
20a69341
PM		 2413 u32 features;
2414
2415#ifdef CONFIG_MODULES
2416 if (list_empty(&nf_tables_set_ops)) {
2417 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2418 request_module("nft-set");
2419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2420 if (!list_empty(&nf_tables_set_ops))
2421 return ERR_PTR(-EAGAIN);
2422 }
2423#endif
2424 features = 0;
2425 if (nla[NFTA_SET_FLAGS] != NULL) {
2426 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
7286ff7f
PNA		 2427 features &= NFT_SET_INTERVAL | NFT_SET_MAP | NFT_SET_TIMEOUT |
2428 NFT_SET_OBJECT;
20a69341
PM		 2429 }
2430
55af753c
PNA		 2431 bops = NULL;
2432 best.size = ~0;
2433 best.lookup = ~0;
0b5a7874 2434 best.space = ~0;
c50b960c 2435
20a69341
PM		 2436 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2437 if ((ops->features & features) != features)
2438 continue;
c50b960c
PM		 2439 if (!ops->estimate(desc, features, &est))
2440 continue;
2441
2442 switch (policy) {
2443 case NFT_SET_POL_PERFORMANCE:
55af753c 2444 if (est.lookup < best.lookup)
c50b960c 2445 break;
0b5a7874
PNA		 2446 if (est.lookup == best.lookup) {
2447 if (!desc->size) {
2448 if (est.space < best.space)
2449 break;
2450 } else if (est.size < best.size) {
2451 break;
2452 }
2453 }
c50b960c
PM		 2454 continue;
2455 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2456 if (!desc->size) {
2457 if (est.space < best.space)
2458 break;
2459 if (est.space == best.space &&
2460 est.lookup < best.lookup)
2461 break;
2462 } else if (est.size < best.size) {
c50b960c 2463 break;
0b5a7874 2464 }
c50b960c
PM		 2465 continue;
2466 default:
2467 break;
2468 }
2469
20a69341
PM		 2470 if (!try_module_get(ops->owner))
2471 continue;
c50b960c
PM		 2472 if (bops != NULL)
2473 module_put(bops->owner);
2474
2475 bops = ops;
2476 best = est;
20a69341
PM		 2477 }
2478
c50b960c
PM		 2479 if (bops != NULL)
2480 return bops;
2481
20a69341
PM		 2482 return ERR_PTR(-EOPNOTSUPP);
2483}
2484
2485static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2486 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2487 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2488 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2489 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2490 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2491 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2492 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2493 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2494 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2495 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2496 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2497 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2498 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2499 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2500 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2501 .len = NFT_USERDATA_MAXLEN },
8aeff920 2502 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2503};
2504
2505static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2506 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2507};
2508
633c9a84 2509static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2510 const struct sk_buff *skb,
2511 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2512 const struct nlattr * const nla[],
2513 u8 genmask)
20a69341
PM		 2514{
2515 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2516 struct nft_af_info *afi = NULL;
2517 struct nft_table *table = NULL;
20a69341 2518
c9c8e485
PNA		 2519 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2520 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2521 if (IS_ERR(afi))
2522 return PTR_ERR(afi);
2523 }
20a69341
PM		 2524
2525 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2526 if (afi == NULL)
2527 return -EAFNOSUPPORT;
2528
f2a6d766
PNA		 2529 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2530 genmask);
20a69341
PM		 2531 if (IS_ERR(table))
2532 return PTR_ERR(table);
2533 }
2534
633c9a84 2535 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2536 return 0;
2537}
2538
2539struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
37a9cc52 2540 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2541{
2542 struct nft_set *set;
2543
2544 if (nla == NULL)
2545 return ERR_PTR(-EINVAL);
2546
2547 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2548 if (!nla_strcmp(nla, set->name) &&
2549 nft_active_genmask(set, genmask))
20a69341
PM		 2550 return set;
2551 }
2552 return ERR_PTR(-ENOENT);
2553}
63aea290 2554EXPORT_SYMBOL_GPL(nf_tables_set_lookup);
20a69341 2555
958bee14 2556struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
37a9cc52
PNA		 2557 const struct nlattr *nla,
2558 u8 genmask)
958bee14
PNA		 2559{
2560 struct nft_trans *trans;
2561 u32 id = ntohl(nla_get_be32(nla));
2562
2563 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2564 struct nft_set *set = nft_trans_set(trans);
2565
958bee14 2566 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2567 id == nft_trans_set_id(trans) &&
2568 nft_active_genmask(set, genmask))
2569 return set;
958bee14
PNA		 2570 }
2571 return ERR_PTR(-ENOENT);
2572}
63aea290 2573EXPORT_SYMBOL_GPL(nf_tables_set_lookup_byid);
958bee14 2574
20a69341
PM		 2575static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2576 const char *name)
2577{
2578 const struct nft_set *i;
2579 const char *p;
2580 unsigned long *inuse;
60eb1894 2581 unsigned int n = 0, min = 0;
20a69341 2582
cb39ad8b 2583 p = strnchr(name, NFT_SET_MAXNAMELEN, '%');
20a69341
PM		 2584 if (p != NULL) {
2585 if (p[1] != 'd' || strchr(p + 2, '%'))
2586 return -EINVAL;
2587
2588 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2589 if (inuse == NULL)
2590 return -ENOMEM;
60eb1894 2591cont:
20a69341 2592 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2593 int tmp;
2594
37a9cc52
PNA		 2595 if (!nft_is_active_next(ctx->net, set))
2596 continue;
14662917 2597 if (!sscanf(i->name, name, &tmp))
20a69341 2598 continue;
60eb1894 2599 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2600 continue;
14662917 2601
60eb1894 2602 set_bit(tmp - min, inuse);
20a69341
PM		 2603 }
2604
53b70287 2605 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2606 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2607 min += BITS_PER_BYTE * PAGE_SIZE;
2608 memset(inuse, 0, PAGE_SIZE);
2609 goto cont;
2610 }
20a69341
PM		 2611 free_page((unsigned long)inuse);
2612 }
2613
60eb1894 2614 snprintf(set->name, sizeof(set->name), name, min + n);
20a69341 2615 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2616 if (!nft_is_active_next(ctx->net, i))
2617 continue;
20a69341
PM		 2618 if (!strcmp(set->name, i->name))
2619 return -ENFILE;
2620 }
2621 return 0;
2622}
2623
2624static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2625 const struct nft_set *set, u16 event, u16 flags)
2626{
2627 struct nfgenmsg *nfmsg;
2628 struct nlmsghdr *nlh;
c50b960c 2629 struct nlattr *desc;
128ad332
PNA		 2630 u32 portid = ctx->portid;
2631 u32 seq = ctx->seq;
20a69341
PM		 2632
2633 event |= NFNL_SUBSYS_NFTABLES << 8;
2634 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2635 flags);
2636 if (nlh == NULL)
2637 goto nla_put_failure;
2638
2639 nfmsg = nlmsg_data(nlh);
2640 nfmsg->nfgen_family = ctx->afi->family;
2641 nfmsg->version = NFNETLINK_V0;
84d7fce6 2642 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2643
2644 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2645 goto nla_put_failure;
2646 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2647 goto nla_put_failure;
2648 if (set->flags != 0)
2649 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2650 goto nla_put_failure;
2651
2652 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2653 goto nla_put_failure;
2654 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2655 goto nla_put_failure;
2656 if (set->flags & NFT_SET_MAP) {
2657 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2658 goto nla_put_failure;
2659 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2660 goto nla_put_failure;
2661 }
8aeff920
PNA		 2662 if (set->flags & NFT_SET_OBJECT &&
2663 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2664 goto nla_put_failure;
20a69341 2665
761da293 2666 if (set->timeout &&
d3e2a111
AP		 2667 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2668 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2669 NFTA_SET_PAD))
761da293
PM		 2670 goto nla_put_failure;
2671 if (set->gc_int &&
2672 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2673 goto nla_put_failure;
2674
9363dc4b
AB		 2675 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2676 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2677 goto nla_put_failure;
2678 }
2679
e6d8ecac
CFG		 2680 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2681 goto nla_put_failure;
2682
c50b960c
PM		 2683 desc = nla_nest_start(skb, NFTA_SET_DESC);
2684 if (desc == NULL)
2685 goto nla_put_failure;
2686 if (set->size &&
2687 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2688 goto nla_put_failure;
2689 nla_nest_end(skb, desc);
2690
053c095a
JB		 2691 nlmsg_end(skb, nlh);
2692 return 0;
20a69341
PM		 2693
2694nla_put_failure:
2695 nlmsg_trim(skb, nlh);
2696 return -1;
2697}
2698
2699static int nf_tables_set_notify(const struct nft_ctx *ctx,
2700 const struct nft_set *set,
31f8441c 2701 int event, gfp_t gfp_flags)
20a69341
PM		 2702{
2703 struct sk_buff *skb;
128ad332 2704 u32 portid = ctx->portid;
20a69341
PM		 2705 int err;
2706
128ad332
PNA		 2707 if (!ctx->report &&
2708 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
20a69341
PM		 2709 return 0;
2710
2711 err = -ENOBUFS;
31f8441c 2712 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2713 if (skb == NULL)
2714 goto err;
2715
2716 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2717 if (err < 0) {
2718 kfree_skb(skb);
2719 goto err;
2720 }
2721
128ad332 2722 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
31f8441c 2723 ctx->report, gfp_flags);
20a69341
PM		 2724err:
2725 if (err < 0)
99633ab2 2726 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
20a69341
PM		 2727 return err;
2728}
2729
5b96af77 2730static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2731{
2732 const struct nft_set *set;
2733 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2734 struct nft_af_info *afi;
c9c8e485
PNA		 2735 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2736 struct net *net = sock_net(skb->sk);
2737 int cur_family = cb->args[3];
5b96af77 2738 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2739
2740 if (cb->args[1])
2741 return skb->len;
2742
e688a7f8 2743 rcu_read_lock();
38e029f1
PNA		 2744 cb->seq = net->nft.base_seq;
2745
e688a7f8 2746 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2747 if (ctx->afi && ctx->afi != afi)
2748 continue;
2749
c9c8e485
PNA		 2750 if (cur_family) {
2751 if (afi->family != cur_family)
2752 continue;
2753
2754 cur_family = 0;
2755 }
e688a7f8 2756 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2757 if (ctx->table && ctx->table != table)
2758 continue;
2759
c9c8e485
PNA		 2760 if (cur_table) {
2761 if (cur_table != table)
2762 continue;
2763
2764 cur_table = NULL;
2765 }
c9c8e485 2766 idx = 0;
5b96af77 2767 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2768 if (idx < s_idx)
2769 goto cont;
37a9cc52
PNA		 2770 if (!nft_is_active(net, set))
2771 goto cont;
5b96af77
PNA		 2772
2773 ctx_set = *ctx;
2774 ctx_set.table = table;
2775 ctx_set.afi = afi;
2776 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2777 NFT_MSG_NEWSET,
2778 NLM_F_MULTI) < 0) {
2779 cb->args[0] = idx;
2780 cb->args[2] = (unsigned long) table;
2781 cb->args[3] = afi->family;
2782 goto done;
2783 }
38e029f1 2784 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2785cont:
2786 idx++;
2787 }
2788 if (s_idx)
2789 s_idx = 0;
2790 }
2791 }
2792 cb->args[1] = 1;
2793done:
e688a7f8 2794 rcu_read_unlock();
c9c8e485
PNA		 2795 return skb->len;
2796}
2797
5b96af77 2798static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2799{
5b96af77
PNA		 2800 kfree(cb->data);
2801 return 0;
20a69341
PM		 2802}
2803
7b8002a1
PNA		 2804static int nf_tables_getset(struct net *net, struct sock *nlsk,
2805 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2806 const struct nlattr * const nla[])
2807{
f2a6d766 2808 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2809 const struct nft_set *set;
2810 struct nft_ctx ctx;
2811 struct sk_buff *skb2;
c9c8e485 2812 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2813 int err;
2814
01cfa0a4 2815 /* Verify existence before starting dump */
f2a6d766 2816 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2817 if (err < 0)
2818 return err;
2819
2820 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2821 struct netlink_dump_control c = {
2822 .dump = nf_tables_dump_sets,
5b96af77 2823 .done = nf_tables_dump_sets_done,
20a69341 2824 };
5b96af77
PNA		 2825 struct nft_ctx *ctx_dump;
2826
2827 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2828 if (ctx_dump == NULL)
2829 return -ENOMEM;
2830
2831 *ctx_dump = ctx;
2832 c.data = ctx_dump;
2833
20a69341
PM		 2834 return netlink_dump_start(nlsk, skb, nlh, &c);
2835 }
2836
c9c8e485
PNA		 2837 /* Only accept unspec with dump */
2838 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2839 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2840 if (!nla[NFTA_SET_TABLE])
2841 return -EINVAL;
c9c8e485 2842
37a9cc52 2843 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2844 if (IS_ERR(set))
2845 return PTR_ERR(set);
2846
2847 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2848 if (skb2 == NULL)
2849 return -ENOMEM;
2850
2851 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2852 if (err < 0)
2853 goto err;
2854
2855 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2856
2857err:
2858 kfree_skb(skb2);
2859 return err;
2860}
2861
c50b960c
PM		 2862static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2863 struct nft_set_desc *desc,
2864 const struct nlattr *nla)
2865{
2866 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2867 int err;
2868
2869 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2870 if (err < 0)
2871 return err;
2872
2873 if (da[NFTA_SET_DESC_SIZE] != NULL)
2874 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2875
2876 return 0;
2877}
2878
633c9a84
PNA		 2879static int nf_tables_newset(struct net *net, struct sock *nlsk,
2880 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 2881 const struct nlattr * const nla[])
2882{
2883 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2884 u8 genmask = nft_genmask_next(net);
20a69341 2885 const struct nft_set_ops *ops;
7c95f6d8 2886 struct nft_af_info *afi;
20a69341
PM		 2887 struct nft_table *table;
2888 struct nft_set *set;
2889 struct nft_ctx ctx;
cb39ad8b 2890 char name[NFT_SET_MAXNAMELEN];
20a69341
PM		 2891 unsigned int size;
2892 bool create;
761da293 2893 u64 timeout;
8aeff920 2894 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 2895 struct nft_set_desc desc;
e6d8ecac
CFG		 2896 unsigned char *udata;
2897 u16 udlen;
20a69341
PM		 2898 int err;
2899
2900 if (nla[NFTA_SET_TABLE] == NULL ||
2901 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2902 nla[NFTA_SET_KEY_LEN] == NULL ||
2903 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2904 return -EINVAL;
2905
c50b960c
PM		 2906 memset(&desc, 0, sizeof(desc));
2907
20a69341
PM		 2908 ktype = NFT_DATA_VALUE;
2909 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2910 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2911 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2912 return -EINVAL;
2913 }
2914
c50b960c 2915 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2916 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2917 return -EINVAL;
2918
2919 flags = 0;
2920 if (nla[NFTA_SET_FLAGS] != NULL) {
2921 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2922 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 2923 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 2924 NFT_SET_MAP | NFT_SET_EVAL |
2925 NFT_SET_OBJECT))
20a69341 2926 return -EINVAL;
8aeff920
PNA		 2927 /* Only one of these operations is supported */
2928 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
2929 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 2930 return -EOPNOTSUPP;
20a69341
PM		 2931 }
2932
2933 dtype = 0;
20a69341
PM		 2934 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2935 if (!(flags & NFT_SET_MAP))
2936 return -EINVAL;
2937
2938 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2939 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2940 dtype != NFT_DATA_VERDICT)
2941 return -EINVAL;
2942
2943 if (dtype != NFT_DATA_VERDICT) {
2944 if (nla[NFTA_SET_DATA_LEN] == NULL)
2945 return -EINVAL;
c50b960c 2946 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 2947 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2948 return -EINVAL;
2949 } else
7d740264 2950 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 2951 } else if (flags & NFT_SET_MAP)
2952 return -EINVAL;
2953
8aeff920
PNA		 2954 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
2955 if (!(flags & NFT_SET_OBJECT))
2956 return -EINVAL;
2957
2958 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
2959 if (objtype == NFT_OBJECT_UNSPEC ||
2960 objtype > NFT_OBJECT_MAX)
2961 return -EINVAL;
2962 } else if (flags & NFT_SET_OBJECT)
2963 return -EINVAL;
2964 else
2965 objtype = NFT_OBJECT_UNSPEC;
2966
761da293
PM		 2967 timeout = 0;
2968 if (nla[NFTA_SET_TIMEOUT] != NULL) {
2969 if (!(flags & NFT_SET_TIMEOUT))
2970 return -EINVAL;
d3e2a111
AP		 2971 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
2972 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 2973 }
2974 gc_int = 0;
2975 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
2976 if (!(flags & NFT_SET_TIMEOUT))
2977 return -EINVAL;
2978 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
2979 }
2980
c50b960c
PM		 2981 policy = NFT_SET_POL_PERFORMANCE;
2982 if (nla[NFTA_SET_POLICY] != NULL)
2983 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2984
2985 if (nla[NFTA_SET_DESC] != NULL) {
2986 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2987 if (err < 0)
2988 return err;
2989 }
2990
20a69341
PM		 2991 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2992
99633ab2 2993 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 2994 if (IS_ERR(afi))
2995 return PTR_ERR(afi);
2996
f2a6d766 2997 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 2998 if (IS_ERR(table))
2999 return PTR_ERR(table);
3000
633c9a84 3001 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3002
37a9cc52 3003 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3004 if (IS_ERR(set)) {
3005 if (PTR_ERR(set) != -ENOENT)
3006 return PTR_ERR(set);
1a28ad74 3007 } else {
20a69341
PM		 3008 if (nlh->nlmsg_flags & NLM_F_EXCL)
3009 return -EEXIST;
3010 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3011 return -EOPNOTSUPP;
3012 return 0;
3013 }
3014
3015 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3016 return -ENOENT;
3017
c50b960c 3018 ops = nft_select_set_ops(nla, &desc, policy);
20a69341
PM		 3019 if (IS_ERR(ops))
3020 return PTR_ERR(ops);
3021
e6d8ecac
CFG		 3022 udlen = 0;
3023 if (nla[NFTA_SET_USERDATA])
3024 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3025
20a69341
PM		 3026 size = 0;
3027 if (ops->privsize != NULL)
3028 size = ops->privsize(nla);
3029
3030 err = -ENOMEM;
e6d8ecac 3031 set = kzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
20a69341
PM		 3032 if (set == NULL)
3033 goto err1;
3034
3035 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
3036 err = nf_tables_set_alloc_name(&ctx, set, name);
3037 if (err < 0)
3038 goto err2;
3039
e6d8ecac
CFG		 3040 udata = NULL;
3041 if (udlen) {
3042 udata = set->data + size;
3043 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3044 }
3045
20a69341
PM		 3046 INIT_LIST_HEAD(&set->bindings);
3047 set->ops = ops;
3048 set->ktype = ktype;
c50b960c 3049 set->klen = desc.klen;
20a69341 3050 set->dtype = dtype;
8aeff920 3051 set->objtype = objtype;
c50b960c 3052 set->dlen = desc.dlen;
20a69341 3053 set->flags = flags;
c50b960c 3054 set->size = desc.size;
9363dc4b 3055 set->policy = policy;
e6d8ecac
CFG		 3056 set->udlen = udlen;
3057 set->udata = udata;
761da293
PM		 3058 set->timeout = timeout;
3059 set->gc_int = gc_int;
20a69341 3060
c50b960c 3061 err = ops->init(set, &desc, nla);
20a69341
PM		 3062 if (err < 0)
3063 goto err2;
3064
958bee14 3065 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3066 if (err < 0)
c17c3cdf 3067 goto err3;
20a69341 3068
e688a7f8 3069 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3070 table->use++;
20a69341
PM		 3071 return 0;
3072
c17c3cdf
LZ		 3073err3:
3074 ops->destroy(set);
20a69341
PM		 3075err2:
3076 kfree(set);
3077err1:
3078 module_put(ops->owner);
3079 return err;
3080}
3081
958bee14 3082static void nft_set_destroy(struct nft_set *set)
20a69341 3083{
20a69341
PM		 3084 set->ops->destroy(set);
3085 module_put(set->ops->owner);
3086 kfree(set);
3087}
3088
958bee14
PNA		 3089static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3090{
e688a7f8 3091 list_del_rcu(&set->list);
31f8441c 3092 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3093 nft_set_destroy(set);
3094}
3095
633c9a84
PNA		 3096static int nf_tables_delset(struct net *net, struct sock *nlsk,
3097 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3098 const struct nlattr * const nla[])
3099{
c9c8e485 3100 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3101 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3102 struct nft_set *set;
3103 struct nft_ctx ctx;
3104 int err;
3105
ec2c9935
PM		 3106 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3107 return -EAFNOSUPPORT;
20a69341
PM		 3108 if (nla[NFTA_SET_TABLE] == NULL)
3109 return -EINVAL;
3110
f2a6d766 3111 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3112 if (err < 0)
3113 return err;
3114
37a9cc52 3115 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3116 if (IS_ERR(set))
3117 return PTR_ERR(set);
3118 if (!list_empty(&set->bindings))
3119 return -EBUSY;
3120
ee01d542 3121 return nft_delset(&ctx, set);
20a69341
PM		 3122}
3123
3124static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3125 struct nft_set *set,
20a69341 3126 const struct nft_set_iter *iter,
de70185d 3127 struct nft_set_elem *elem)
20a69341 3128{
fe2811eb 3129 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3130 enum nft_registers dreg;
3131
3132 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3133 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3134 set->dtype == NFT_DATA_VERDICT ?
3135 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3136 set->dlen);
20a69341
PM		 3137}
3138
3139int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3140 struct nft_set_binding *binding)
3141{
3142 struct nft_set_binding *i;
3143 struct nft_set_iter iter;
3144
3145 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3146 return -EBUSY;
3147
11113e19 3148 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3149 /* If the set is already bound to the same chain all
3150 * jumps are already validated for that chain.
3151 */
3152 list_for_each_entry(i, &set->bindings, list) {
a4684402 3153 if (i->flags & NFT_SET_MAP &&
11113e19 3154 i->chain == binding->chain)
20a69341
PM		 3155 goto bind;
3156 }
3157
8588ac09 3158 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3159 iter.skip = 0;
3160 iter.count = 0;
3161 iter.err = 0;
3162 iter.fn = nf_tables_bind_check_setelem;
1f48ff6c 3163 iter.flush = false;
20a69341
PM		 3164
3165 set->ops->walk(ctx, set, &iter);
a02f4248 3166 if (iter.err < 0)
20a69341 3167 return iter.err;
20a69341
PM		 3168 }
3169bind:
3170 binding->chain = ctx->chain;
e688a7f8 3171 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3172 return 0;
3173}
63aea290 3174EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3175
3176void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3177 struct nft_set_binding *binding)
3178{
e688a7f8 3179 list_del_rcu(&binding->list);
20a69341 3180
958bee14 3181 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 3182 nft_is_active(ctx->net, set))
20a69341
PM		 3183 nf_tables_set_destroy(ctx, set);
3184}
63aea290 3185EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3186
3ac4c07a
PM		 3187const struct nft_set_ext_type nft_set_ext_types[] = {
3188 [NFT_SET_EXT_KEY] = {
7d740264 3189 .align = __alignof__(u32),
3ac4c07a
PM		 3190 },
3191 [NFT_SET_EXT_DATA] = {
7d740264 3192 .align = __alignof__(u32),
3ac4c07a 3193 },
f25ad2e9
PM		 3194 [NFT_SET_EXT_EXPR] = {
3195 .align = __alignof__(struct nft_expr),
3196 },
8aeff920
PNA		 3197 [NFT_SET_EXT_OBJREF] = {
3198 .len = sizeof(struct nft_object *),
3199 .align = __alignof__(struct nft_object *),
3200 },
3ac4c07a
PM		 3201 [NFT_SET_EXT_FLAGS] = {
3202 .len = sizeof(u8),
3203 .align = __alignof__(u8),
3204 },
c3e1b005
PM		 3205 [NFT_SET_EXT_TIMEOUT] = {
3206 .len = sizeof(u64),
3207 .align = __alignof__(u64),
3208 },
3209 [NFT_SET_EXT_EXPIRATION] = {
3210 .len = sizeof(unsigned long),
3211 .align = __alignof__(unsigned long),
3212 },
68e942e8
PM		 3213 [NFT_SET_EXT_USERDATA] = {
3214 .len = sizeof(struct nft_userdata),
3215 .align = __alignof__(struct nft_userdata),
3216 },
3ac4c07a
PM		 3217};
3218EXPORT_SYMBOL_GPL(nft_set_ext_types);
3219
20a69341
PM		 3220/*
3221 * Set elements
3222 */
3223
3224static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3225 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3226 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3227 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3228 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3229 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3230 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3231};
3232
3233static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3234 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3235 .len = NFT_TABLE_MAXNAMELEN - 1 },
3236 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3237 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3238 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3239 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3240};
3241
633c9a84 3242static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3243 const struct sk_buff *skb,
3244 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3245 const struct nlattr * const nla[],
3246 u8 genmask)
20a69341
PM		 3247{
3248 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3249 struct nft_af_info *afi;
3250 struct nft_table *table;
20a69341 3251
99633ab2 3252 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3253 if (IS_ERR(afi))
3254 return PTR_ERR(afi);
3255
f2a6d766
PNA		 3256 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3257 genmask);
20a69341
PM		 3258 if (IS_ERR(table))
3259 return PTR_ERR(table);
3260
633c9a84 3261 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3262 return 0;
3263}
3264
3265static int nf_tables_fill_setelem(struct sk_buff *skb,
3266 const struct nft_set *set,
3267 const struct nft_set_elem *elem)
3268{
fe2811eb 3269 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3270 unsigned char *b = skb_tail_pointer(skb);
3271 struct nlattr *nest;
3272
3273 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3274 if (nest == NULL)
3275 goto nla_put_failure;
3276
fe2811eb
PM		 3277 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3278 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3279 goto nla_put_failure;
3280
fe2811eb
PM		 3281 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3282 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3283 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3284 set->dlen) < 0)
3285 goto nla_put_failure;
3286
f25ad2e9
PM		 3287 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3288 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3289 goto nla_put_failure;
3290
8aeff920
PNA		 3291 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3292 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3293 (*nft_set_ext_obj(ext))->name) < 0)
3294 goto nla_put_failure;
3295
fe2811eb
PM		 3296 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3297 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3298 htonl(*nft_set_ext_flags(ext))))
3299 goto nla_put_failure;
20a69341 3300
c3e1b005
PM		 3301 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3302 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3303 cpu_to_be64(jiffies_to_msecs(
3304 *nft_set_ext_timeout(ext))),
b46f6ded 3305 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3306 goto nla_put_failure;
3307
3308 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3309 unsigned long expires, now = jiffies;
3310
3311 expires = *nft_set_ext_expiration(ext);
3312 if (time_before(now, expires))
3313 expires -= now;
3314 else
3315 expires = 0;
3316
3317 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3318 cpu_to_be64(jiffies_to_msecs(expires)),
3319 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3320 goto nla_put_failure;
3321 }
3322
68e942e8
PM		 3323 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3324 struct nft_userdata *udata;
3325
3326 udata = nft_set_ext_userdata(ext);
3327 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3328 udata->len + 1, udata->data))
3329 goto nla_put_failure;
3330 }
3331
20a69341
PM		 3332 nla_nest_end(skb, nest);
3333 return 0;
3334
3335nla_put_failure:
3336 nlmsg_trim(skb, b);
3337 return -EMSGSIZE;
3338}
3339
3340struct nft_set_dump_args {
3341 const struct netlink_callback *cb;
3342 struct nft_set_iter iter;
3343 struct sk_buff *skb;
3344};
3345
3346static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3347 struct nft_set *set,
20a69341 3348 const struct nft_set_iter *iter,
de70185d 3349 struct nft_set_elem *elem)
20a69341
PM		 3350{
3351 struct nft_set_dump_args *args;
3352
3353 args = container_of(iter, struct nft_set_dump_args, iter);
3354 return nf_tables_fill_setelem(args->skb, set, elem);
3355}
3356
3357static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3358{
633c9a84 3359 struct net *net = sock_net(skb->sk);
f2a6d766 3360 u8 genmask = nft_genmask_cur(net);
de70185d 3361 struct nft_set *set;
20a69341
PM		 3362 struct nft_set_dump_args args;
3363 struct nft_ctx ctx;
3364 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
3365 struct nfgenmsg *nfmsg;
3366 struct nlmsghdr *nlh;
3367 struct nlattr *nest;
3368 u32 portid, seq;
3369 int event, err;
3370
720e0dfa
MN		 3371 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
3372 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
20a69341
PM		 3373 if (err < 0)
3374 return err;
3375
633c9a84 3376 err = nft_ctx_init_from_elemattr(&ctx, net, cb->skb, cb->nlh,
f2a6d766 3377 (void *)nla, genmask);
20a69341
PM		 3378 if (err < 0)
3379 return err;
3380
37a9cc52
PNA		 3381 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3382 genmask);
20a69341
PM		 3383 if (IS_ERR(set))
3384 return PTR_ERR(set);
3385
3386 event = NFT_MSG_NEWSETELEM;
3387 event |= NFNL_SUBSYS_NFTABLES << 8;
3388 portid = NETLINK_CB(cb->skb).portid;
3389 seq = cb->nlh->nlmsg_seq;
3390
3391 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3392 NLM_F_MULTI);
3393 if (nlh == NULL)
3394 goto nla_put_failure;
3395
3396 nfmsg = nlmsg_data(nlh);
6403d962 3397 nfmsg->nfgen_family = ctx.afi->family;
20a69341 3398 nfmsg->version = NFNETLINK_V0;
84d7fce6 3399 nfmsg->res_id = htons(ctx.net->nft.base_seq & 0xffff);
20a69341
PM		 3400
3401 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
3402 goto nla_put_failure;
3403 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3404 goto nla_put_failure;
3405
3406 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3407 if (nest == NULL)
3408 goto nla_put_failure;
3409
8588ac09
PNA		 3410 args.cb = cb;
3411 args.skb = skb;
3412 args.iter.genmask = nft_genmask_cur(ctx.net);
3413 args.iter.skip = cb->args[0];
3414 args.iter.count = 0;
3415 args.iter.err = 0;
3416 args.iter.fn = nf_tables_dump_setelem;
1f48ff6c 3417 args.iter.flush = false;
20a69341
PM		 3418 set->ops->walk(&ctx, set, &args.iter);
3419
3420 nla_nest_end(skb, nest);
3421 nlmsg_end(skb, nlh);
3422
3423 if (args.iter.err && args.iter.err != -EMSGSIZE)
3424 return args.iter.err;
3425 if (args.iter.count == cb->args[0])
3426 return 0;
3427
3428 cb->args[0] = args.iter.count;
3429 return skb->len;
3430
3431nla_put_failure:
3432 return -ENOSPC;
3433}
3434
7b8002a1
PNA		 3435static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3436 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3437 const struct nlattr * const nla[])
3438{
f2a6d766 3439 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3440 const struct nft_set *set;
3441 struct nft_ctx ctx;
3442 int err;
3443
f2a6d766 3444 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3445 if (err < 0)
3446 return err;
3447
37a9cc52
PNA		 3448 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3449 genmask);
20a69341
PM		 3450 if (IS_ERR(set))
3451 return PTR_ERR(set);
3452
3453 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3454 struct netlink_dump_control c = {
3455 .dump = nf_tables_dump_set,
3456 };
3457 return netlink_dump_start(nlsk, skb, nlh, &c);
3458 }
3459 return -EOPNOTSUPP;
3460}
3461
d60ce62f
AB		 3462static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3463 const struct nft_ctx *ctx, u32 seq,
3464 u32 portid, int event, u16 flags,
3465 const struct nft_set *set,
3466 const struct nft_set_elem *elem)
3467{
3468 struct nfgenmsg *nfmsg;
3469 struct nlmsghdr *nlh;
3470 struct nlattr *nest;
3471 int err;
3472
3473 event |= NFNL_SUBSYS_NFTABLES << 8;
3474 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3475 flags);
3476 if (nlh == NULL)
3477 goto nla_put_failure;
3478
3479 nfmsg = nlmsg_data(nlh);
3480 nfmsg->nfgen_family = ctx->afi->family;
3481 nfmsg->version = NFNETLINK_V0;
84d7fce6 3482 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3483
3484 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3485 goto nla_put_failure;
3486 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3487 goto nla_put_failure;
3488
3489 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3490 if (nest == NULL)
3491 goto nla_put_failure;
3492
3493 err = nf_tables_fill_setelem(skb, set, elem);
3494 if (err < 0)
3495 goto nla_put_failure;
3496
3497 nla_nest_end(skb, nest);
3498
053c095a
JB		 3499 nlmsg_end(skb, nlh);
3500 return 0;
d60ce62f
AB		 3501
3502nla_put_failure:
3503 nlmsg_trim(skb, nlh);
3504 return -1;
3505}
3506
3507static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
3508 const struct nft_set *set,
3509 const struct nft_set_elem *elem,
3510 int event, u16 flags)
3511{
128ad332
PNA		 3512 struct net *net = ctx->net;
3513 u32 portid = ctx->portid;
d60ce62f
AB		 3514 struct sk_buff *skb;
3515 int err;
3516
128ad332 3517 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
d60ce62f
AB		 3518 return 0;
3519
3520 err = -ENOBUFS;
3521 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3522 if (skb == NULL)
3523 goto err;
3524
3525 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3526 set, elem);
3527 if (err < 0) {
3528 kfree_skb(skb);
3529 goto err;
3530 }
3531
128ad332 3532 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
d60ce62f
AB		 3533 GFP_KERNEL);
3534err:
3535 if (err < 0)
3536 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3537 return err;
3538}
3539
60319eb1
PNA		 3540static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3541 int msg_type,
3542 struct nft_set *set)
3543{
3544 struct nft_trans *trans;
3545
3546 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3547 if (trans == NULL)
3548 return NULL;
3549
3550 nft_trans_elem_set(trans) = set;
3551 return trans;
3552}
3553
22fe54d5
PM		 3554void *nft_set_elem_init(const struct nft_set *set,
3555 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3556 const u32 *key, const u32 *data,
22fe54d5 3557 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3558{
3559 struct nft_set_ext *ext;
3560 void *elem;
3561
3562 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3563 if (elem == NULL)
3564 return NULL;
3565
3566 ext = nft_set_elem_ext(set, elem);
3567 nft_set_ext_init(ext, tmpl);
3568
3569 memcpy(nft_set_ext_key(ext), key, set->klen);
3570 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3571 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3572 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3573 *nft_set_ext_expiration(ext) =
d3e2a111 3574 jiffies + timeout;
c3e1b005
PM		 3575 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3576 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3577
3578 return elem;
3579}
3580
61f9e292
LZ		 3581void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3582 bool destroy_expr)
61edafbb
PM		 3583{
3584 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3585
3586 nft_data_uninit(nft_set_ext_key(ext), NFT_DATA_VALUE);
3587 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3588 nft_data_uninit(nft_set_ext_data(ext), set->dtype);
61f9e292 3589 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3590 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3591 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3592 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3593 kfree(elem);
3594}
3595EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3596
0e9091d6
PNA		 3597static int nft_setelem_parse_flags(const struct nft_set *set,
3598 const struct nlattr *attr, u32 *flags)
3599{
3600 if (attr == NULL)
3601 return 0;
3602
3603 *flags = ntohl(nla_get_be32(attr));
3604 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3605 return -EINVAL;
3606 if (!(set->flags & NFT_SET_INTERVAL) &&
3607 *flags & NFT_SET_ELEM_INTERVAL_END)
3608 return -EINVAL;
3609
3610 return 0;
3611}
3612
60319eb1 3613static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3614 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3615{
3616 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3617 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3618 struct nft_data_desc d1, d2;
fe2811eb 3619 struct nft_set_ext_tmpl tmpl;
c016c7e4 3620 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3621 struct nft_set_elem elem;
3622 struct nft_set_binding *binding;
8aeff920 3623 struct nft_object *obj = NULL;
68e942e8 3624 struct nft_userdata *udata;
fe2811eb 3625 struct nft_data data;
20a69341 3626 enum nft_registers dreg;
60319eb1 3627 struct nft_trans *trans;
0e9091d6 3628 u32 flags = 0;
c3e1b005 3629 u64 timeout;
68e942e8 3630 u8 ulen;
20a69341
PM		 3631 int err;
3632
3633 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3634 nft_set_elem_policy);
3635 if (err < 0)
3636 return err;
3637
3638 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3639 return -EINVAL;
3640
fe2811eb
PM		 3641 nft_set_ext_prepare(&tmpl);
3642
0e9091d6
PNA		 3643 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3644 if (err < 0)
3645 return err;
3646 if (flags != 0)
3647 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3648
3649 if (set->flags & NFT_SET_MAP) {
3650 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3651 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3652 return -EINVAL;
bd7fc645 3653 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3654 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3655 return -EINVAL;
20a69341
PM		 3656 } else {
3657 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3658 return -EINVAL;
3659 }
3660
c3e1b005
PM		 3661 timeout = 0;
3662 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3663 if (!(set->flags & NFT_SET_TIMEOUT))
3664 return -EINVAL;
d3e2a111
AP		 3665 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3666 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3667 } else if (set->flags & NFT_SET_TIMEOUT) {
3668 timeout = set->timeout;
3669 }
3670
7d740264 3671 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3672 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3673 if (err < 0)
3674 goto err1;
3675 err = -EINVAL;
3676 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3677 goto err2;
3678
7d740264 3679 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3680 if (timeout > 0) {
3681 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3682 if (timeout != set->timeout)
3683 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3684 }
fe2811eb 3685
8aeff920
PNA		 3686 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3687 if (!(set->flags & NFT_SET_OBJECT)) {
3688 err = -EINVAL;
3689 goto err2;
3690 }
3691 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3692 set->objtype, genmask);
3693 if (IS_ERR(obj)) {
3694 err = PTR_ERR(obj);
3695 goto err2;
3696 }
3697 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3698 }
3699
20a69341 3700 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3701 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3702 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3703 if (err < 0)
3704 goto err2;
3705
3706 err = -EINVAL;
3707 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3708 goto err3;
3709
3710 dreg = nft_type_to_reg(set->dtype);
3711 list_for_each_entry(binding, &set->bindings, list) {
3712 struct nft_ctx bind_ctx = {
58c78e10 3713 .net = ctx->net,
20a69341
PM		 3714 .afi = ctx->afi,
3715 .table = ctx->table,
7c95f6d8 3716 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3717 };
3718
11113e19
PM		 3719 if (!(binding->flags & NFT_SET_MAP))
3720 continue;
3721
1ec10212
PM		 3722 err = nft_validate_register_store(&bind_ctx, dreg,
3723 &data,
3724 d2.type, d2.len);
20a69341
PM		 3725 if (err < 0)
3726 goto err3;
3727 }
fe2811eb 3728
7d740264 3729 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3730 }
3731
68e942e8
PM		 3732 /* The full maximum length of userdata can exceed the maximum
3733 * offset value (U8_MAX) for following extensions, therefor it
3734 * must be the last extension added.
3735 */
3736 ulen = 0;
3737 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3738 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3739 if (ulen > 0)
3740 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3741 ulen);
3742 }
3743
fe2811eb 3744 err = -ENOMEM;
7d740264 3745 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3746 timeout, GFP_KERNEL);
fe2811eb
PM		 3747 if (elem.priv == NULL)
3748 goto err3;
3749
3750 ext = nft_set_elem_ext(set, elem.priv);
3751 if (flags)
3752 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3753 if (ulen > 0) {
3754 udata = nft_set_ext_userdata(ext);
3755 udata->len = ulen - 1;
3756 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3757 }
8aeff920
PNA		 3758 if (obj) {
3759 *nft_set_ext_obj(ext) = obj;
3760 obj->use++;
3761 }
fe2811eb 3762
60319eb1
PNA		 3763 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3764 if (trans == NULL)
fe2811eb 3765 goto err4;
60319eb1 3766
69086658 3767 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 3768 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3769 if (err) {
3770 if (err == -EEXIST) {
8aeff920
PNA		 3771 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3772 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3773 memcmp(nft_set_ext_data(ext),
3774 nft_set_ext_data(ext2), set->dlen) != 0) ||
3775 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3776 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3777 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 3778 err = -EBUSY;
3779 else if (!(nlmsg_flags & NLM_F_EXCL))
3780 err = 0;
3781 }
fe2811eb 3782 goto err5;
c016c7e4 3783 }
20a69341 3784
35d0ac90
PNA		 3785 if (set->size &&
3786 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3787 err = -ENFILE;
3788 goto err6;
3789 }
3790
60319eb1 3791 nft_trans_elem(trans) = elem;
46bbafce 3792 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3793 return 0;
3794
35d0ac90 3795err6:
5cb82a38 3796 set->ops->remove(ctx->net, set, &elem);
fe2811eb 3797err5:
60319eb1 3798 kfree(trans);
fe2811eb
PM		 3799err4:
3800 kfree(elem.priv);
20a69341
PM		 3801err3:
3802 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fe2811eb 3803 nft_data_uninit(&data, d2.type);
20a69341 3804err2:
7d740264 3805 nft_data_uninit(&elem.key.val, d1.type);
20a69341
PM		 3806err1:
3807 return err;
3808}
3809
633c9a84
PNA		 3810static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3811 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3812 const struct nlattr * const nla[])
3813{
f2a6d766 3814 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3815 const struct nlattr *attr;
3816 struct nft_set *set;
3817 struct nft_ctx ctx;
60319eb1 3818 int rem, err = 0;
20a69341 3819
7d5570ca
PNA		 3820 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3821 return -EINVAL;
3822
f2a6d766 3823 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3824 if (err < 0)
3825 return err;
3826
37a9cc52
PNA		 3827 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3828 genmask);
958bee14
PNA		 3829 if (IS_ERR(set)) {
3830 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3831 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3832 nla[NFTA_SET_ELEM_LIST_SET_ID],
3833 genmask);
958bee14
PNA		 3834 }
3835 if (IS_ERR(set))
3836 return PTR_ERR(set);
3837 }
3838
20a69341
PM		 3839 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3840 return -EBUSY;
3841
3842 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 3843 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 3844 if (err < 0)
60319eb1 3845 break;
20a69341 3846 }
60319eb1 3847 return err;
20a69341
PM		 3848}
3849
60319eb1 3850static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 3851 const struct nlattr *attr)
3852{
3853 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 3854 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 3855 struct nft_data_desc desc;
3856 struct nft_set_elem elem;
3971ca14 3857 struct nft_set_ext *ext;
60319eb1 3858 struct nft_trans *trans;
3971ca14
PNA		 3859 u32 flags = 0;
3860 void *priv;
20a69341
PM		 3861 int err;
3862
3863 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3864 nft_set_elem_policy);
3865 if (err < 0)
3866 goto err1;
3867
3868 err = -EINVAL;
3869 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3870 goto err1;
3871
3971ca14
PNA		 3872 nft_set_ext_prepare(&tmpl);
3873
3874 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3875 if (err < 0)
3876 return err;
3877 if (flags != 0)
3878 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3879
7d740264 3880 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 3881 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3882 if (err < 0)
3883 goto err1;
3884
3885 err = -EINVAL;
3886 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3887 goto err2;
3888
3971ca14
PNA		 3889 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
3890
3891 err = -ENOMEM;
3892 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
3893 GFP_KERNEL);
3894 if (elem.priv == NULL)
3895 goto err2;
3896
3897 ext = nft_set_elem_ext(set, elem.priv);
3898 if (flags)
3899 *nft_set_ext_flags(ext) = flags;
3900
60319eb1 3901 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 3902 if (trans == NULL) {
3903 err = -ENOMEM;
3971ca14 3904 goto err3;
609ccf08 3905 }
20a69341 3906
42a55769 3907 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 3908 if (priv == NULL) {
cc02e457 3909 err = -ENOENT;
3971ca14 3910 goto err4;
cc02e457 3911 }
3971ca14
PNA		 3912 kfree(elem.priv);
3913 elem.priv = priv;
cc02e457 3914
60319eb1 3915 nft_trans_elem(trans) = elem;
46bbafce 3916 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 3917 return 0;
cc02e457 3918
3971ca14 3919err4:
cc02e457 3920 kfree(trans);
3971ca14
PNA		 3921err3:
3922 kfree(elem.priv);
20a69341 3923err2:
7d740264 3924 nft_data_uninit(&elem.key.val, desc.type);
20a69341
PM		 3925err1:
3926 return err;
3927}
3928
8411b644 3929static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 3930 struct nft_set *set,
8411b644 3931 const struct nft_set_iter *iter,
de70185d 3932 struct nft_set_elem *elem)
8411b644
PNA		 3933{
3934 struct nft_trans *trans;
3935 int err;
3936
3937 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
3938 sizeof(struct nft_trans_elem), GFP_ATOMIC);
3939 if (!trans)
3940 return -ENOMEM;
3941
1ba1c414 3942 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 3943 err = -ENOENT;
3944 goto err1;
3945 }
b2c11e4b 3946 set->ndeact++;
8411b644 3947
de70185d
PNA		 3948 nft_trans_elem_set(trans) = set;
3949 nft_trans_elem(trans) = *elem;
8411b644
PNA		 3950 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3951
3952 return 0;
3953err1:
3954 kfree(trans);
3955 return err;
3956}
3957
633c9a84
PNA		 3958static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
3959 struct sk_buff *skb, const struct nlmsghdr *nlh,
20a69341
PM		 3960 const struct nlattr * const nla[])
3961{
f2a6d766 3962 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3963 const struct nlattr *attr;
3964 struct nft_set *set;
3965 struct nft_ctx ctx;
60319eb1 3966 int rem, err = 0;
20a69341 3967
f2a6d766 3968 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3969 if (err < 0)
3970 return err;
3971
37a9cc52
PNA		 3972 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3973 genmask);
20a69341
PM		 3974 if (IS_ERR(set))
3975 return PTR_ERR(set);
3976 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3977 return -EBUSY;
3978
8411b644 3979 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 3980 struct nft_set_iter iter = {
3981 .genmask = genmask,
3982 .fn = nft_flush_set,
1f48ff6c 3983 .flush = true,
8411b644 3984 };
baa2d42c 3985 set->ops->walk(&ctx, set, &iter);
8411b644 3986
baa2d42c 3987 return iter.err;
8411b644
PNA		 3988 }
3989
20a69341
PM		 3990 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3991 err = nft_del_setelem(&ctx, set, attr);
3992 if (err < 0)
60319eb1 3993 break;
4fefee57 3994
3dd0673a 3995 set->ndeact++;
20a69341 3996 }
60319eb1 3997 return err;
20a69341
PM		 3998}
3999
cfed7e1b
PM		 4000void nft_set_gc_batch_release(struct rcu_head *rcu)
4001{
4002 struct nft_set_gc_batch *gcb;
4003 unsigned int i;
4004
4005 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4006 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4007 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4008 kfree(gcb);
4009}
4010EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4011
4012struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4013 gfp_t gfp)
4014{
4015 struct nft_set_gc_batch *gcb;
4016
4017 gcb = kzalloc(sizeof(*gcb), gfp);
4018 if (gcb == NULL)
4019 return gcb;
4020 gcb->head.set = set;
4021 return gcb;
4022}
4023EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4024
e5009240
PNA		 4025/*
4026 * Stateful objects
4027 */
4028
4029/**
4030 * nft_register_obj- register nf_tables stateful object type
4031 * @obj: object type
4032 *
4033 * Registers the object type for use with nf_tables. Returns zero on
4034 * success or a negative errno code otherwise.
4035 */
4036int nft_register_obj(struct nft_object_type *obj_type)
4037{
4038 if (obj_type->type == NFT_OBJECT_UNSPEC)
4039 return -EINVAL;
4040
4041 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4042 list_add_rcu(&obj_type->list, &nf_tables_objects);
4043 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4044 return 0;
4045}
4046EXPORT_SYMBOL_GPL(nft_register_obj);
4047
4048/**
4049 * nft_unregister_obj - unregister nf_tables object type
4050 * @obj: object type
4051 *
4052 * Unregisters the object type for use with nf_tables.
4053 */
4054void nft_unregister_obj(struct nft_object_type *obj_type)
4055{
4056 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4057 list_del_rcu(&obj_type->list);
4058 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4059}
4060EXPORT_SYMBOL_GPL(nft_unregister_obj);
4061
4062struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4063 const struct nlattr *nla,
4064 u32 objtype, u8 genmask)
4065{
4066 struct nft_object *obj;
4067
4068 list_for_each_entry(obj, &table->objects, list) {
4069 if (!nla_strcmp(nla, obj->name) &&
4070 objtype == obj->type->type &&
4071 nft_active_genmask(obj, genmask))
4072 return obj;
4073 }
4074 return ERR_PTR(-ENOENT);
4075}
4076EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4077
4078static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4079 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4080 .len = NFT_TABLE_MAXNAMELEN - 1 },
4081 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4082 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4083 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4084 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4085};
4086
4087static struct nft_object *nft_obj_init(const struct nft_object_type *type,
4088 const struct nlattr *attr)
4089{
4090 struct nlattr *tb[type->maxattr + 1];
4091 struct nft_object *obj;
4092 int err;
4093
4094 if (attr) {
4095 err = nla_parse_nested(tb, type->maxattr, attr, type->policy);
4096 if (err < 0)
4097 goto err1;
4098 } else {
4099 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4100 }
4101
4102 err = -ENOMEM;
4103 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4104 if (obj == NULL)
4105 goto err1;
4106
4107 err = type->init((const struct nlattr * const *)tb, obj);
4108 if (err < 0)
4109 goto err2;
4110
4111 obj->type = type;
4112 return obj;
4113err2:
4114 kfree(obj);
4115err1:
4116 return ERR_PTR(err);
4117}
4118
4119static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4120 struct nft_object *obj, bool reset)
e5009240
PNA		 4121{
4122 struct nlattr *nest;
4123
4124 nest = nla_nest_start(skb, attr);
4125 if (!nest)
4126 goto nla_put_failure;
43da04a5 4127 if (obj->type->dump(skb, obj, reset) < 0)
e5009240
PNA		 4128 goto nla_put_failure;
4129 nla_nest_end(skb, nest);
4130 return 0;
4131
4132nla_put_failure:
4133 return -1;
4134}
4135
4136static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4137{
4138 const struct nft_object_type *type;
4139
4140 list_for_each_entry(type, &nf_tables_objects, list) {
4141 if (objtype == type->type)
4142 return type;
4143 }
4144 return NULL;
4145}
4146
4147static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4148{
4149 const struct nft_object_type *type;
4150
4151 type = __nft_obj_type_get(objtype);
4152 if (type != NULL && try_module_get(type->owner))
4153 return type;
4154
4155#ifdef CONFIG_MODULES
4156 if (type == NULL) {
4157 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4158 request_module("nft-obj-%u", objtype);
4159 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4160 if (__nft_obj_type_get(objtype))
4161 return ERR_PTR(-EAGAIN);
4162 }
4163#endif
4164 return ERR_PTR(-ENOENT);
4165}
4166
4167static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4168 struct sk_buff *skb, const struct nlmsghdr *nlh,
4169 const struct nlattr * const nla[])
4170{
4171 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4172 const struct nft_object_type *type;
4173 u8 genmask = nft_genmask_next(net);
4174 int family = nfmsg->nfgen_family;
4175 struct nft_af_info *afi;
4176 struct nft_table *table;
4177 struct nft_object *obj;
4178 struct nft_ctx ctx;
4179 u32 objtype;
4180 int err;
4181
4182 if (!nla[NFTA_OBJ_TYPE] ||
4183 !nla[NFTA_OBJ_NAME] ||
4184 !nla[NFTA_OBJ_DATA])
4185 return -EINVAL;
4186
4187 afi = nf_tables_afinfo_lookup(net, family, true);
4188 if (IS_ERR(afi))
4189 return PTR_ERR(afi);
4190
4191 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4192 if (IS_ERR(table))
4193 return PTR_ERR(table);
4194
4195 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4196 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4197 if (IS_ERR(obj)) {
4198 err = PTR_ERR(obj);
4199 if (err != -ENOENT)
4200 return err;
4201
1a28ad74 4202 } else {
e5009240
PNA		 4203 if (nlh->nlmsg_flags & NLM_F_EXCL)
4204 return -EEXIST;
4205
4206 return 0;
4207 }
4208
4209 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4210
4211 type = nft_obj_type_get(objtype);
4212 if (IS_ERR(type))
4213 return PTR_ERR(type);
4214
4215 obj = nft_obj_init(type, nla[NFTA_OBJ_DATA]);
4216 if (IS_ERR(obj)) {
4217 err = PTR_ERR(obj);
4218 goto err1;
4219 }
18965317 4220 obj->table = table;
e5009240
PNA		 4221 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4222
4223 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4224 if (err < 0)
4225 goto err2;
4226
4227 list_add_tail_rcu(&obj->list, &table->objects);
4228 table->use++;
4229 return 0;
4230err2:
4231 if (obj->type->destroy)
4232 obj->type->destroy(obj);
4233 kfree(obj);
4234err1:
4235 module_put(type->owner);
4236 return err;
4237}
4238
4239static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4240 u32 portid, u32 seq, int event, u32 flags,
4241 int family, const struct nft_table *table,
43da04a5 4242 struct nft_object *obj, bool reset)
e5009240
PNA		 4243{
4244 struct nfgenmsg *nfmsg;
4245 struct nlmsghdr *nlh;
4246
4247 event |= NFNL_SUBSYS_NFTABLES << 8;
4248 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4249 if (nlh == NULL)
4250 goto nla_put_failure;
4251
4252 nfmsg = nlmsg_data(nlh);
4253 nfmsg->nfgen_family = family;
4254 nfmsg->version = NFNETLINK_V0;
4255 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4256
4257 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4258 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4259 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4260 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4261 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4262 goto nla_put_failure;
4263
4264 nlmsg_end(skb, nlh);
4265 return 0;
4266
4267nla_put_failure:
4268 nlmsg_trim(skb, nlh);
4269 return -1;
4270}
4271
a9fea2a3
PNA		 4272struct nft_obj_filter {
4273 char table[NFT_OBJ_MAXNAMELEN];
4274 u32 type;
4275};
4276
e5009240
PNA		 4277static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4278{
4279 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4280 const struct nft_af_info *afi;
4281 const struct nft_table *table;
e5009240 4282 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4283 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4284 struct net *net = sock_net(skb->sk);
4285 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4286 struct nft_object *obj;
4287 bool reset = false;
4288
4289 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4290 reset = true;
e5009240
PNA		 4291
4292 rcu_read_lock();
4293 cb->seq = net->nft.base_seq;
4294
4295 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4296 if (family != NFPROTO_UNSPEC && family != afi->family)
4297 continue;
4298
4299 list_for_each_entry_rcu(table, &afi->tables, list) {
4300 list_for_each_entry_rcu(obj, &table->objects, list) {
4301 if (!nft_is_active(net, obj))
4302 goto cont;
4303 if (idx < s_idx)
4304 goto cont;
4305 if (idx > s_idx)
4306 memset(&cb->args[1], 0,
4307 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4308 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4309 strcmp(filter->table, table->name))
4310 goto cont;
d21e540b
LZ		 4311 if (filter &&
4312 filter->type != NFT_OBJECT_UNSPEC &&
a9fea2a3
PNA		 4313 obj->type->type != filter->type)
4314 goto cont;
4315
e5009240
PNA		 4316 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4317 cb->nlh->nlmsg_seq,
4318 NFT_MSG_NEWOBJ,
4319 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4320 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4321 goto done;
4322
4323 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4324cont:
4325 idx++;
4326 }
4327 }
4328 }
4329done:
4330 rcu_read_unlock();
4331
4332 cb->args[0] = idx;
4333 return skb->len;
4334}
4335
a9fea2a3
PNA		 4336static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4337{
4338 kfree(cb->data);
4339
4340 return 0;
4341}
4342
4343static struct nft_obj_filter *
4344nft_obj_filter_alloc(const struct nlattr * const nla[])
4345{
4346 struct nft_obj_filter *filter;
4347
4348 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4349 if (!filter)
4350 return ERR_PTR(-ENOMEM);
4351
4352 if (nla[NFTA_OBJ_TABLE])
4353 nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
4354 NFT_TABLE_MAXNAMELEN);
4355 if (nla[NFTA_OBJ_TYPE])
4356 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4357
4358 return filter;
4359}
4360
e5009240
PNA		 4361static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4362 struct sk_buff *skb, const struct nlmsghdr *nlh,
4363 const struct nlattr * const nla[])
4364{
4365 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4366 u8 genmask = nft_genmask_cur(net);
4367 int family = nfmsg->nfgen_family;
4368 const struct nft_af_info *afi;
4369 const struct nft_table *table;
4370 struct nft_object *obj;
4371 struct sk_buff *skb2;
43da04a5 4372 bool reset = false;
e5009240
PNA		 4373 u32 objtype;
4374 int err;
4375
4376 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4377 struct netlink_dump_control c = {
4378 .dump = nf_tables_dump_obj,
a9fea2a3 4379 .done = nf_tables_dump_obj_done,
e5009240 4380 };
a9fea2a3
PNA		 4381
4382 if (nla[NFTA_OBJ_TABLE] ||
4383 nla[NFTA_OBJ_TYPE]) {
4384 struct nft_obj_filter *filter;
4385
4386 filter = nft_obj_filter_alloc(nla);
4387 if (IS_ERR(filter))
4388 return -ENOMEM;
4389
4390 c.data = filter;
4391 }
e5009240
PNA		 4392 return netlink_dump_start(nlsk, skb, nlh, &c);
4393 }
4394
4395 if (!nla[NFTA_OBJ_NAME] ||
4396 !nla[NFTA_OBJ_TYPE])
4397 return -EINVAL;
4398
4399 afi = nf_tables_afinfo_lookup(net, family, false);
4400 if (IS_ERR(afi))
4401 return PTR_ERR(afi);
4402
4403 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4404 if (IS_ERR(table))
4405 return PTR_ERR(table);
4406
4407 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4408 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4409 if (IS_ERR(obj))
4410 return PTR_ERR(obj);
4411
4412 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4413 if (!skb2)
4414 return -ENOMEM;
4415
43da04a5
PNA		 4416 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4417 reset = true;
4418
e5009240
PNA		 4419 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4420 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4421 family, table, obj, reset);
e5009240
PNA		 4422 if (err < 0)
4423 goto err;
4424
4425 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4426err:
4427 kfree_skb(skb2);
4428 return err;
4429
4430 return 0;
4431}
4432
4433static void nft_obj_destroy(struct nft_object *obj)
4434{
4435 if (obj->type->destroy)
4436 obj->type->destroy(obj);
4437
4438 module_put(obj->type->owner);
4439 kfree(obj);
4440}
4441
4442static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4443 struct sk_buff *skb, const struct nlmsghdr *nlh,
4444 const struct nlattr * const nla[])
4445{
4446 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4447 u8 genmask = nft_genmask_next(net);
4448 int family = nfmsg->nfgen_family;
4449 struct nft_af_info *afi;
4450 struct nft_table *table;
4451 struct nft_object *obj;
4452 struct nft_ctx ctx;
4453 u32 objtype;
4454
4455 if (!nla[NFTA_OBJ_TYPE] ||
4456 !nla[NFTA_OBJ_NAME])
4457 return -EINVAL;
4458
4459 afi = nf_tables_afinfo_lookup(net, family, true);
4460 if (IS_ERR(afi))
4461 return PTR_ERR(afi);
4462
4463 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4464 if (IS_ERR(table))
4465 return PTR_ERR(table);
4466
4467 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4468 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4469 if (IS_ERR(obj))
4470 return PTR_ERR(obj);
4471 if (obj->use > 0)
4472 return -EBUSY;
4473
4474 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4475
4476 return nft_delobj(&ctx, obj);
4477}
4478
2599e989
PNA		 4479int nft_obj_notify(struct net *net, struct nft_table *table,
4480 struct nft_object *obj, u32 portid, u32 seq, int event,
4481 int family, int report, gfp_t gfp)
e5009240
PNA		 4482{
4483 struct sk_buff *skb;
4484 int err;
4485
2599e989
PNA		 4486 if (!report &&
4487 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
e5009240
PNA		 4488 return 0;
4489
4490 err = -ENOBUFS;
2599e989 4491 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4492 if (skb == NULL)
4493 goto err;
4494
2599e989
PNA		 4495 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4496 table, obj, false);
e5009240
PNA		 4497 if (err < 0) {
4498 kfree_skb(skb);
4499 goto err;
4500 }
4501
2599e989 4502 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
e5009240
PNA		 4503err:
4504 if (err < 0) {
2599e989 4505 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
e5009240
PNA		 4506 }
4507 return err;
4508}
2599e989
PNA		 4509EXPORT_SYMBOL_GPL(nft_obj_notify);
4510
4511static int nf_tables_obj_notify(const struct nft_ctx *ctx,
4512 struct nft_object *obj, int event)
4513{
4514 return nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
4515 ctx->seq, event, ctx->afi->family, ctx->report,
4516 GFP_KERNEL);
4517}
e5009240 4518
84d7fce6
PNA		 4519static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4520 u32 portid, u32 seq)
4521{
4522 struct nlmsghdr *nlh;
4523 struct nfgenmsg *nfmsg;
4524 int event = (NFNL_SUBSYS_NFTABLES << 8) | NFT_MSG_NEWGEN;
4525
4526 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4527 if (nlh == NULL)
4528 goto nla_put_failure;
4529
4530 nfmsg = nlmsg_data(nlh);
4531 nfmsg->nfgen_family = AF_UNSPEC;
4532 nfmsg->version = NFNETLINK_V0;
4533 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4534
4535 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)))
4536 goto nla_put_failure;
4537
053c095a
JB		 4538 nlmsg_end(skb, nlh);
4539 return 0;
84d7fce6
PNA		 4540
4541nla_put_failure:
4542 nlmsg_trim(skb, nlh);
4543 return -EMSGSIZE;
4544}
4545
4546static int nf_tables_gen_notify(struct net *net, struct sk_buff *skb, int event)
4547{
4548 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4549 struct sk_buff *skb2;
4550 int err;
4551
4552 if (nlmsg_report(nlh) &&
4553 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4554 return 0;
4555
4556 err = -ENOBUFS;
4557 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4558 if (skb2 == NULL)
4559 goto err;
4560
4561 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4562 nlh->nlmsg_seq);
4563 if (err < 0) {
4564 kfree_skb(skb2);
4565 goto err;
4566 }
4567
4568 err = nfnetlink_send(skb2, net, NETLINK_CB(skb).portid,
4569 NFNLGRP_NFTABLES, nlmsg_report(nlh), GFP_KERNEL);
4570err:
4571 if (err < 0) {
4572 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4573 err);
4574 }
4575 return err;
4576}
4577
7b8002a1
PNA		 4578static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4579 struct sk_buff *skb, const struct nlmsghdr *nlh,
84d7fce6
PNA		 4580 const struct nlattr * const nla[])
4581{
84d7fce6
PNA		 4582 struct sk_buff *skb2;
4583 int err;
4584
4585 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4586 if (skb2 == NULL)
4587 return -ENOMEM;
4588
4589 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4590 nlh->nlmsg_seq);
4591 if (err < 0)
4592 goto err;
4593
4594 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4595err:
4596 kfree_skb(skb2);
4597 return err;
4598}
4599
96518518
PM		 4600static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4601 [NFT_MSG_NEWTABLE] = {
55dd6f93 4602 .call_batch = nf_tables_newtable,
96518518
PM		 4603 .attr_count = NFTA_TABLE_MAX,
4604 .policy = nft_table_policy,
4605 },
4606 [NFT_MSG_GETTABLE] = {
4607 .call = nf_tables_gettable,
4608 .attr_count = NFTA_TABLE_MAX,
4609 .policy = nft_table_policy,
4610 },
4611 [NFT_MSG_DELTABLE] = {
55dd6f93 4612 .call_batch = nf_tables_deltable,
96518518
PM		 4613 .attr_count = NFTA_TABLE_MAX,
4614 .policy = nft_table_policy,
4615 },
4616 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4617 .call_batch = nf_tables_newchain,
96518518
PM		 4618 .attr_count = NFTA_CHAIN_MAX,
4619 .policy = nft_chain_policy,
4620 },
4621 [NFT_MSG_GETCHAIN] = {
4622 .call = nf_tables_getchain,
4623 .attr_count = NFTA_CHAIN_MAX,
4624 .policy = nft_chain_policy,
4625 },
4626 [NFT_MSG_DELCHAIN] = {
91c7b38d 4627 .call_batch = nf_tables_delchain,
96518518
PM		 4628 .attr_count = NFTA_CHAIN_MAX,
4629 .policy = nft_chain_policy,
4630 },
4631 [NFT_MSG_NEWRULE] = {
0628b123 4632 .call_batch = nf_tables_newrule,
96518518
PM		 4633 .attr_count = NFTA_RULE_MAX,
4634 .policy = nft_rule_policy,
4635 },
4636 [NFT_MSG_GETRULE] = {
4637 .call = nf_tables_getrule,
4638 .attr_count = NFTA_RULE_MAX,
4639 .policy = nft_rule_policy,
4640 },
4641 [NFT_MSG_DELRULE] = {
0628b123 4642 .call_batch = nf_tables_delrule,
96518518
PM		 4643 .attr_count = NFTA_RULE_MAX,
4644 .policy = nft_rule_policy,
4645 },
20a69341 4646 [NFT_MSG_NEWSET] = {
958bee14 4647 .call_batch = nf_tables_newset,
20a69341
PM		 4648 .attr_count = NFTA_SET_MAX,
4649 .policy = nft_set_policy,
4650 },
4651 [NFT_MSG_GETSET] = {
4652 .call = nf_tables_getset,
4653 .attr_count = NFTA_SET_MAX,
4654 .policy = nft_set_policy,
4655 },
4656 [NFT_MSG_DELSET] = {
958bee14 4657 .call_batch = nf_tables_delset,
20a69341
PM		 4658 .attr_count = NFTA_SET_MAX,
4659 .policy = nft_set_policy,
4660 },
4661 [NFT_MSG_NEWSETELEM] = {
958bee14 4662 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4663 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4664 .policy = nft_set_elem_list_policy,
4665 },
4666 [NFT_MSG_GETSETELEM] = {
4667 .call = nf_tables_getsetelem,
4668 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4669 .policy = nft_set_elem_list_policy,
4670 },
4671 [NFT_MSG_DELSETELEM] = {
958bee14 4672 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4673 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4674 .policy = nft_set_elem_list_policy,
4675 },
84d7fce6
PNA		 4676 [NFT_MSG_GETGEN] = {
4677 .call = nf_tables_getgen,
4678 },
e5009240
PNA		 4679 [NFT_MSG_NEWOBJ] = {
4680 .call_batch = nf_tables_newobj,
4681 .attr_count = NFTA_OBJ_MAX,
4682 .policy = nft_obj_policy,
4683 },
4684 [NFT_MSG_GETOBJ] = {
4685 .call = nf_tables_getobj,
4686 .attr_count = NFTA_OBJ_MAX,
4687 .policy = nft_obj_policy,
4688 },
4689 [NFT_MSG_DELOBJ] = {
4690 .call_batch = nf_tables_delobj,
4691 .attr_count = NFTA_OBJ_MAX,
4692 .policy = nft_obj_policy,
4693 },
43da04a5
PNA		 4694 [NFT_MSG_GETOBJ_RESET] = {
4695 .call = nf_tables_getobj,
4696 .attr_count = NFTA_OBJ_MAX,
4697 .policy = nft_obj_policy,
4698 },
96518518
PM		 4699};
4700
91c7b38d
PNA		 4701static void nft_chain_commit_update(struct nft_trans *trans)
4702{
4703 struct nft_base_chain *basechain;
4704
4705 if (nft_trans_chain_name(trans)[0])
4706 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4707
4708 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
4709 return;
4710
4711 basechain = nft_base_chain(trans->ctx.chain);
4712 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4713
4714 switch (nft_trans_chain_policy(trans)) {
4715 case NF_DROP:
4716 case NF_ACCEPT:
4717 basechain->policy = nft_trans_chain_policy(trans);
4718 break;
4719 }
4720}
4721
b326dd37 4722static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 4723{
c7c32e72
PNA		 4724 switch (trans->msg_type) {
4725 case NFT_MSG_DELTABLE:
4726 nf_tables_table_destroy(&trans->ctx);
4727 break;
4728 case NFT_MSG_DELCHAIN:
4729 nf_tables_chain_destroy(trans->ctx.chain);
4730 break;
4731 case NFT_MSG_DELRULE:
4732 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4733 break;
4734 case NFT_MSG_DELSET:
4735 nft_set_destroy(nft_trans_set(trans));
4736 break;
61edafbb
PM		 4737 case NFT_MSG_DELSETELEM:
4738 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4739 nft_trans_elem(trans).priv, true);
61edafbb 4740 break;
e5009240
PNA		 4741 case NFT_MSG_DELOBJ:
4742 nft_obj_destroy(nft_trans_obj(trans));
4743 break;
c7c32e72
PNA		 4744 }
4745 kfree(trans);
4746}
4747
5913beaf 4748static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 4749{
37082f93 4750 struct nft_trans *trans, *next;
a3716e70 4751 struct nft_trans_elem *te;
37082f93
PNA		 4752
4753 /* Bump generation counter, invalidate any dump in progress */
38e029f1 4754 while (++net->nft.base_seq == 0);
37082f93
PNA		 4755
4756 /* A new generation has just started */
ea4bd995 4757 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 4758
4759 /* Make sure all packets have left the previous generation before
4760 * purging old rules.
4761 */
4762 synchronize_rcu();
4763
4764 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 4765 switch (trans->msg_type) {
55dd6f93
PNA		 4766 case NFT_MSG_NEWTABLE:
4767 if (nft_trans_table_update(trans)) {
4768 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4769 nf_tables_table_disable(net,
4770 trans->ctx.afi,
55dd6f93
PNA		 4771 trans->ctx.table);
4772 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4773 }
4774 } else {
f2a6d766 4775 nft_clear(net, trans->ctx.table);
55dd6f93 4776 }
35151d84 4777 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 4778 nft_trans_destroy(trans);
4779 break;
4780 case NFT_MSG_DELTABLE:
f2a6d766 4781 list_del_rcu(&trans->ctx.table->list);
35151d84 4782 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 4783 break;
91c7b38d
PNA		 4784 case NFT_MSG_NEWCHAIN:
4785 if (nft_trans_chain_update(trans))
4786 nft_chain_commit_update(trans);
4fefee57 4787 else
664b0f8c 4788 nft_clear(net, trans->ctx.chain);
4fefee57 4789
35151d84 4790 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 4791 nft_trans_destroy(trans);
4792 break;
4793 case NFT_MSG_DELCHAIN:
664b0f8c 4794 list_del_rcu(&trans->ctx.chain->list);
35151d84 4795 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 4796 nf_tables_unregister_hooks(trans->ctx.net,
4797 trans->ctx.table,
c5598794
AB		 4798 trans->ctx.chain,
4799 trans->ctx.afi->nops);
91c7b38d 4800 break;
b380e5c7 4801 case NFT_MSG_NEWRULE:
889f7ee7 4802 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 4803 nf_tables_rule_notify(&trans->ctx,
37082f93 4804 nft_trans_rule(trans),
35151d84 4805 NFT_MSG_NEWRULE);
37082f93 4806 nft_trans_destroy(trans);
b380e5c7
PNA		 4807 break;
4808 case NFT_MSG_DELRULE:
4809 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 4810 nf_tables_rule_notify(&trans->ctx,
4811 nft_trans_rule(trans),
4812 NFT_MSG_DELRULE);
b380e5c7 4813 break;
958bee14 4814 case NFT_MSG_NEWSET:
37a9cc52 4815 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 4816 /* This avoids hitting -EBUSY when deleting the table
4817 * from the transaction.
4818 */
4819 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
4820 !list_empty(&nft_trans_set(trans)->bindings))
4821 trans->ctx.table->use--;
4822
958bee14 4823 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4824 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 4825 nft_trans_destroy(trans);
4826 break;
4827 case NFT_MSG_DELSET:
37a9cc52 4828 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 4829 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 4830 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 4831 break;
60319eb1 4832 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 4833 te = (struct nft_trans_elem *)trans->data;
4834
42a55769 4835 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 4836 nf_tables_setelem_notify(&trans->ctx, te->set,
4837 &te->elem,
60319eb1
PNA		 4838 NFT_MSG_NEWSETELEM, 0);
4839 nft_trans_destroy(trans);
4840 break;
4841 case NFT_MSG_DELSETELEM:
a3716e70 4842 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4843
a3716e70
PNA		 4844 nf_tables_setelem_notify(&trans->ctx, te->set,
4845 &te->elem,
60319eb1 4846 NFT_MSG_DELSETELEM, 0);
5cb82a38 4847 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 4848 atomic_dec(&te->set->nelems);
4849 te->set->ndeact--;
60319eb1 4850 break;
e5009240
PNA		 4851 case NFT_MSG_NEWOBJ:
4852 nft_clear(net, nft_trans_obj(trans));
4853 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4854 NFT_MSG_NEWOBJ);
4855 nft_trans_destroy(trans);
4856 break;
4857 case NFT_MSG_DELOBJ:
4858 list_del_rcu(&nft_trans_obj(trans)->list);
4859 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
4860 NFT_MSG_DELOBJ);
4861 break;
37082f93 4862 }
37082f93
PNA		 4863 }
4864
b326dd37
PNA		 4865 synchronize_rcu();
4866
37082f93 4867 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 4868 list_del(&trans->list);
b326dd37 4869 nf_tables_commit_release(trans);
37082f93 4870 }
84d7fce6
PNA		 4871
4872 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 4873
4874 return 0;
4875}
4876
b326dd37 4877static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 4878{
c7c32e72
PNA		 4879 switch (trans->msg_type) {
4880 case NFT_MSG_NEWTABLE:
4881 nf_tables_table_destroy(&trans->ctx);
4882 break;
4883 case NFT_MSG_NEWCHAIN:
4884 nf_tables_chain_destroy(trans->ctx.chain);
4885 break;
4886 case NFT_MSG_NEWRULE:
4887 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4888 break;
4889 case NFT_MSG_NEWSET:
4890 nft_set_destroy(nft_trans_set(trans));
4891 break;
61edafbb
PM		 4892 case NFT_MSG_NEWSETELEM:
4893 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 4894 nft_trans_elem(trans).priv, true);
61edafbb 4895 break;
e5009240
PNA		 4896 case NFT_MSG_NEWOBJ:
4897 nft_obj_destroy(nft_trans_obj(trans));
4898 break;
c7c32e72
PNA		 4899 }
4900 kfree(trans);
4901}
4902
5913beaf 4903static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 4904{
37082f93 4905 struct nft_trans *trans, *next;
02263db0 4906 struct nft_trans_elem *te;
37082f93 4907
a907e36d
XL		 4908 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
4909 list) {
b380e5c7 4910 switch (trans->msg_type) {
55dd6f93
PNA		 4911 case NFT_MSG_NEWTABLE:
4912 if (nft_trans_table_update(trans)) {
4913 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4914 nf_tables_table_disable(net,
4915 trans->ctx.afi,
55dd6f93
PNA		 4916 trans->ctx.table);
4917 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4918 }
4919 nft_trans_destroy(trans);
4920 } else {
e688a7f8 4921 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 4922 }
4923 break;
4924 case NFT_MSG_DELTABLE:
f2a6d766 4925 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 4926 nft_trans_destroy(trans);
4927 break;
91c7b38d
PNA		 4928 case NFT_MSG_NEWCHAIN:
4929 if (nft_trans_chain_update(trans)) {
982f4051 4930 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 4931
4932 nft_trans_destroy(trans);
4933 } else {
4fefee57 4934 trans->ctx.table->use--;
e688a7f8 4935 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 4936 nf_tables_unregister_hooks(trans->ctx.net,
4937 trans->ctx.table,
c5598794
AB		 4938 trans->ctx.chain,
4939 trans->ctx.afi->nops);
91c7b38d
PNA		 4940 }
4941 break;
4942 case NFT_MSG_DELCHAIN:
4fefee57 4943 trans->ctx.table->use++;
664b0f8c 4944 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 4945 nft_trans_destroy(trans);
4946 break;
b380e5c7 4947 case NFT_MSG_NEWRULE:
4fefee57 4948 trans->ctx.chain->use--;
b380e5c7
PNA		 4949 list_del_rcu(&nft_trans_rule(trans)->list);
4950 break;
4951 case NFT_MSG_DELRULE:
4fefee57 4952 trans->ctx.chain->use++;
889f7ee7 4953 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 4954 nft_trans_destroy(trans);
b380e5c7 4955 break;
958bee14 4956 case NFT_MSG_NEWSET:
4fefee57 4957 trans->ctx.table->use--;
e688a7f8 4958 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 4959 break;
4960 case NFT_MSG_DELSET:
4fefee57 4961 trans->ctx.table->use++;
37a9cc52 4962 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 4963 nft_trans_destroy(trans);
4964 break;
60319eb1 4965 case NFT_MSG_NEWSETELEM:
02263db0 4966 te = (struct nft_trans_elem *)trans->data;
fe2811eb 4967
5cb82a38 4968 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 4969 atomic_dec(&te->set->nelems);
60319eb1
PNA		 4970 break;
4971 case NFT_MSG_DELSETELEM:
cc02e457
PM		 4972 te = (struct nft_trans_elem *)trans->data;
4973
42a55769 4974 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 4975 te->set->ndeact--;
cc02e457 4976
e5009240
PNA		 4977 nft_trans_destroy(trans);
4978 break;
4979 case NFT_MSG_NEWOBJ:
4980 trans->ctx.table->use--;
4981 list_del_rcu(&nft_trans_obj(trans)->list);
4982 break;
4983 case NFT_MSG_DELOBJ:
4984 trans->ctx.table->use++;
4985 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 4986 nft_trans_destroy(trans);
4987 break;
37082f93 4988 }
37082f93
PNA		 4989 }
4990
b326dd37
PNA		 4991 synchronize_rcu();
4992
a1cee076
PNA		 4993 list_for_each_entry_safe_reverse(trans, next,
4994 &net->nft.commit_list, list) {
c7c32e72 4995 list_del(&trans->list);
b326dd37 4996 nf_tables_abort_release(trans);
37082f93
PNA		 4997 }
4998
4999 return 0;
5000}
5001
74e8bcd2
PNA		 5002static bool nf_tables_valid_genid(struct net *net, u32 genid)
5003{
5004 return net->nft.base_seq == genid;
5005}
5006
96518518
PM		 5007static const struct nfnetlink_subsystem nf_tables_subsys = {
5008 .name = "nf_tables",
5009 .subsys_id = NFNL_SUBSYS_NFTABLES,
5010 .cb_count = NFT_MSG_MAX,
5011 .cb = nf_tables_cb,
0628b123
PNA		 5012 .commit = nf_tables_commit,
5013 .abort = nf_tables_abort,
74e8bcd2 5014 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5015};
5016
7210e4e3
PNA		 5017int nft_chain_validate_dependency(const struct nft_chain *chain,
5018 enum nft_chain_type type)
5019{
5020 const struct nft_base_chain *basechain;
5021
5022 if (chain->flags & NFT_BASE_CHAIN) {
5023 basechain = nft_base_chain(chain);
5024 if (basechain->type->type != type)
5025 return -EOPNOTSUPP;
5026 }
5027 return 0;
5028}
5029EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5030
75e8d06d
PNA		 5031int nft_chain_validate_hooks(const struct nft_chain *chain,
5032 unsigned int hook_flags)
5033{
5034 struct nft_base_chain *basechain;
5035
5036 if (chain->flags & NFT_BASE_CHAIN) {
5037 basechain = nft_base_chain(chain);
5038
5039 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5040 return 0;
5041
5042 return -EOPNOTSUPP;
5043 }
5044
5045 return 0;
5046}
5047EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5048
20a69341
PM		 5049/*
5050 * Loop detection - walk through the ruleset beginning at the destination chain
5051 * of a new jump until either the source chain is reached (loop) or all
5052 * reachable chains have been traversed.
5053 *
5054 * The loop check is performed whenever a new jump verdict is added to an
5055 * expression or verdict map or a verdict map is bound to a new chain.
5056 */
5057
5058static int nf_tables_check_loops(const struct nft_ctx *ctx,
5059 const struct nft_chain *chain);
5060
5061static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5062 struct nft_set *set,
20a69341 5063 const struct nft_set_iter *iter,
de70185d 5064 struct nft_set_elem *elem)
20a69341 5065{
fe2811eb
PM		 5066 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5067 const struct nft_data *data;
5068
5069 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5070 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5071 return 0;
5072
fe2811eb 5073 data = nft_set_ext_data(ext);
1ca2e170 5074 switch (data->verdict.code) {
20a69341
PM		 5075 case NFT_JUMP:
5076 case NFT_GOTO:
1ca2e170 5077 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5078 default:
5079 return 0;
5080 }
5081}
5082
5083static int nf_tables_check_loops(const struct nft_ctx *ctx,
5084 const struct nft_chain *chain)
5085{
5086 const struct nft_rule *rule;
5087 const struct nft_expr *expr, *last;
de70185d 5088 struct nft_set *set;
20a69341
PM		 5089 struct nft_set_binding *binding;
5090 struct nft_set_iter iter;
20a69341
PM		 5091
5092 if (ctx->chain == chain)
5093 return -ELOOP;
5094
5095 list_for_each_entry(rule, &chain->rules, list) {
5096 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5097 const struct nft_data *data = NULL;
5098 int err;
5099
5100 if (!expr->ops->validate)
20a69341
PM		 5101 continue;
5102
0ca743a5
PNA		 5103 err = expr->ops->validate(ctx, expr, &data);
5104 if (err < 0)
5105 return err;
5106
20a69341 5107 if (data == NULL)
0ca743a5 5108 continue;
20a69341 5109
1ca2e170 5110 switch (data->verdict.code) {
20a69341
PM		 5111 case NFT_JUMP:
5112 case NFT_GOTO:
1ca2e170
PM		 5113 err = nf_tables_check_loops(ctx,
5114 data->verdict.chain);
20a69341
PM		 5115 if (err < 0)
5116 return err;
5117 default:
5118 break;
5119 }
5120 }
5121 }
5122
5123 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5124 if (!nft_is_active_next(ctx->net, set))
5125 continue;
20a69341
PM		 5126 if (!(set->flags & NFT_SET_MAP) ||
5127 set->dtype != NFT_DATA_VERDICT)
5128 continue;
5129
5130 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5131 if (!(binding->flags & NFT_SET_MAP) ||
5132 binding->chain != chain)
20a69341
PM		 5133 continue;
5134
8588ac09 5135 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5136 iter.skip = 0;
5137 iter.count = 0;
5138 iter.err = 0;
5139 iter.fn = nf_tables_loop_check_setelem;
1f48ff6c 5140 iter.flush = false;
20a69341
PM		 5141
5142 set->ops->walk(ctx, set, &iter);
5143 if (iter.err < 0)
5144 return iter.err;
5145 }
5146 }
5147
5148 return 0;
5149}
5150
36b701fa
LGL		 5151/**
5152 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5153 *
5154 * @attr: netlink attribute to fetch value from
5155 * @max: maximum value to be stored in dest
5156 * @dest: pointer to the variable
5157 *
5158 * Parse, check and store a given u32 netlink attribute into variable.
5159 * This function returns -ERANGE if the value goes over maximum value.
5160 * Otherwise a 0 is returned and the attribute value is stored in the
5161 * destination variable.
5162 */
f1d505bb 5163int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5164{
09525a09 5165 u32 val;
36b701fa
LGL		 5166
5167 val = ntohl(nla_get_be32(attr));
5168 if (val > max)
5169 return -ERANGE;
5170
5171 *dest = val;
5172 return 0;
5173}
5174EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5175
49499c3e
PM		 5176/**
5177 * nft_parse_register - parse a register value from a netlink attribute
5178 *
5179 * @attr: netlink attribute
5180 *
5181 * Parse and translate a register value from a netlink attribute.
5182 * Registers used to be 128 bit wide, these register numbers will be
5183 * mapped to the corresponding 32 bit register numbers.
5184 */
b1c96ed3
PM		 5185unsigned int nft_parse_register(const struct nlattr *attr)
5186{
49499c3e
PM		 5187 unsigned int reg;
5188
5189 reg = ntohl(nla_get_be32(attr));
5190 switch (reg) {
5191 case NFT_REG_VERDICT...NFT_REG_4:
5192 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5193 default:
5194 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5195 }
b1c96ed3
PM		 5196}
5197EXPORT_SYMBOL_GPL(nft_parse_register);
5198
49499c3e
PM		 5199/**
5200 * nft_dump_register - dump a register value to a netlink attribute
5201 *
5202 * @skb: socket buffer
5203 * @attr: attribute number
5204 * @reg: register number
5205 *
5206 * Construct a netlink attribute containing the register number. For
5207 * compatibility reasons, register numbers being a multiple of 4 are
5208 * translated to the corresponding 128 bit register numbers.
5209 */
b1c96ed3
PM		 5210int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5211{
49499c3e
PM		 5212 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5213 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5214 else
5215 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5216
b1c96ed3
PM		 5217 return nla_put_be32(skb, attr, htonl(reg));
5218}
5219EXPORT_SYMBOL_GPL(nft_dump_register);
5220
96518518 5221/**
d07db988 5222 * nft_validate_register_load - validate a load from a register
96518518
PM		 5223 *
5224 * @reg: the register number
d07db988 5225 * @len: the length of the data
96518518
PM		 5226 *
5227 * Validate that the input register is one of the general purpose
d07db988 5228 * registers and that the length of the load is within the bounds.
96518518 5229 */
d07db988 5230int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5231{
49499c3e 5232 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5233 return -EINVAL;
d07db988
PM		 5234 if (len == 0)
5235 return -EINVAL;
49499c3e 5236 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5237 return -ERANGE;
49499c3e 5238
96518518
PM		 5239 return 0;
5240}
d07db988 5241EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5242
96518518 5243/**
1ec10212 5244 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5245 *
5246 * @ctx: context of the expression performing the load
5247 * @reg: the destination register number
5248 * @data: the data to load
5249 * @type: the data type
45d9bcda 5250 * @len: the length of the data
96518518
PM		 5251 *
5252 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5253 * the destination register and the length is within the bounds.
5254 * A value of NULL for the data means that its runtime gathered
58f40ab6 5255 * data.
96518518 5256 */
1ec10212
PM		 5257int nft_validate_register_store(const struct nft_ctx *ctx,
5258 enum nft_registers reg,
5259 const struct nft_data *data,
5260 enum nft_data_types type, unsigned int len)
96518518 5261{
20a69341
PM		 5262 int err;
5263
96518518
PM		 5264 switch (reg) {
5265 case NFT_REG_VERDICT:
58f40ab6 5266 if (type != NFT_DATA_VERDICT)
96518518 5267 return -EINVAL;
20a69341 5268
58f40ab6 5269 if (data != NULL &&
1ca2e170
PM		 5270 (data->verdict.code == NFT_GOTO ||
5271 data->verdict.code == NFT_JUMP)) {
5272 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5273 if (err < 0)
5274 return err;
5275
1ca2e170
PM		 5276 if (ctx->chain->level + 1 >
5277 data->verdict.chain->level) {
20a69341
PM		 5278 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5279 return -EMLINK;
1ca2e170 5280 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5281 }
5282 }
5283
96518518
PM		 5284 return 0;
5285 default:
49499c3e 5286 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5287 return -EINVAL;
45d9bcda
PM		 5288 if (len == 0)
5289 return -EINVAL;
49499c3e
PM		 5290 if (reg * NFT_REG32_SIZE + len >
5291 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5292 return -ERANGE;
27e6d201 5293
96518518
PM		 5294 if (data != NULL && type != NFT_DATA_VALUE)
5295 return -EINVAL;
5296 return 0;
5297 }
5298}
1ec10212 5299EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5300
5301static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5302 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5303 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5304 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5305};
5306
5307static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5308 struct nft_data_desc *desc, const struct nlattr *nla)
5309{
664b0f8c 5310 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5311 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5312 struct nft_chain *chain;
5313 int err;
5314
5315 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
5316 if (err < 0)
5317 return err;
5318
5319 if (!tb[NFTA_VERDICT_CODE])
5320 return -EINVAL;
1ca2e170 5321 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5322
1ca2e170 5323 switch (data->verdict.code) {
e0abdadc 5324 default:
1ca2e170 5325 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5326 case NF_ACCEPT:
5327 case NF_DROP:
5328 case NF_QUEUE:
5329 break;
5330 default:
5331 return -EINVAL;
5332 }
5333 /* fall through */
96518518
PM		 5334 case NFT_CONTINUE:
5335 case NFT_BREAK:
5336 case NFT_RETURN:
96518518
PM		 5337 break;
5338 case NFT_JUMP:
5339 case NFT_GOTO:
5340 if (!tb[NFTA_VERDICT_CHAIN])
5341 return -EINVAL;
5342 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5343 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5344 if (IS_ERR(chain))
5345 return PTR_ERR(chain);
5346 if (chain->flags & NFT_BASE_CHAIN)
5347 return -EOPNOTSUPP;
5348
96518518 5349 chain->use++;
1ca2e170 5350 data->verdict.chain = chain;
96518518 5351 break;
96518518
PM		 5352 }
5353
4c4ed074 5354 desc->len = sizeof(data->verdict);
96518518
PM		 5355 desc->type = NFT_DATA_VERDICT;
5356 return 0;
5357}
5358
5359static void nft_verdict_uninit(const struct nft_data *data)
5360{
1ca2e170 5361 switch (data->verdict.code) {
96518518
PM		 5362 case NFT_JUMP:
5363 case NFT_GOTO:
1ca2e170 5364 data->verdict.chain->use--;
96518518
PM		 5365 break;
5366 }
5367}
5368
33d5a7b1 5369int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5370{
5371 struct nlattr *nest;
5372
33d5a7b1 5373 nest = nla_nest_start(skb, type);
96518518
PM		 5374 if (!nest)
5375 goto nla_put_failure;
5376
33d5a7b1 5377 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5378 goto nla_put_failure;
5379
33d5a7b1 5380 switch (v->code) {
96518518
PM		 5381 case NFT_JUMP:
5382 case NFT_GOTO:
1ca2e170 5383 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5384 v->chain->name))
96518518
PM		 5385 goto nla_put_failure;
5386 }
5387 nla_nest_end(skb, nest);
5388 return 0;
5389
5390nla_put_failure:
5391 return -1;
5392}
5393
d0a11fc3
PM		 5394static int nft_value_init(const struct nft_ctx *ctx,
5395 struct nft_data *data, unsigned int size,
96518518
PM		 5396 struct nft_data_desc *desc, const struct nlattr *nla)
5397{
5398 unsigned int len;
5399
5400 len = nla_len(nla);
5401 if (len == 0)
5402 return -EINVAL;
d0a11fc3 5403 if (len > size)
96518518
PM		 5404 return -EOVERFLOW;
5405
d0a11fc3 5406 nla_memcpy(data->data, nla, len);
96518518
PM		 5407 desc->type = NFT_DATA_VALUE;
5408 desc->len = len;
5409 return 0;
5410}
5411
5412static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5413 unsigned int len)
5414{
5415 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5416}
5417
5418static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5419 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5420 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5421};
5422
5423/**
5424 * nft_data_init - parse nf_tables data netlink attributes
5425 *
5426 * @ctx: context of the expression using the data
5427 * @data: destination struct nft_data
d0a11fc3 5428 * @size: maximum data length
96518518
PM		 5429 * @desc: data description
5430 * @nla: netlink attribute containing data
5431 *
5432 * Parse the netlink data attributes and initialize a struct nft_data.
5433 * The type and length of data are returned in the data description.
5434 *
5435 * The caller can indicate that it only wants to accept data of type
5436 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5437 */
d0a11fc3
PM		 5438int nft_data_init(const struct nft_ctx *ctx,
5439 struct nft_data *data, unsigned int size,
96518518
PM		 5440 struct nft_data_desc *desc, const struct nlattr *nla)
5441{
5442 struct nlattr *tb[NFTA_DATA_MAX + 1];
5443 int err;
5444
5445 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
5446 if (err < 0)
5447 return err;
5448
5449 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5450 return nft_value_init(ctx, data, size, desc,
5451 tb[NFTA_DATA_VALUE]);
96518518
PM		 5452 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5453 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5454 return -EINVAL;
5455}
5456EXPORT_SYMBOL_GPL(nft_data_init);
5457
5458/**
5459 * nft_data_uninit - release a nft_data item
5460 *
5461 * @data: struct nft_data to release
5462 * @type: type of data
5463 *
5464 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5465 * all others need to be released by calling this function.
5466 */
5467void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
5468{
960bd2c2 5469 if (type < NFT_DATA_VERDICT)
96518518 5470 return;
960bd2c2 5471 switch (type) {
96518518
PM		 5472 case NFT_DATA_VERDICT:
5473 return nft_verdict_uninit(data);
5474 default:
5475 WARN_ON(1);
5476 }
5477}
5478EXPORT_SYMBOL_GPL(nft_data_uninit);
5479
5480int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5481 enum nft_data_types type, unsigned int len)
5482{
5483 struct nlattr *nest;
5484 int err;
5485
5486 nest = nla_nest_start(skb, attr);
5487 if (nest == NULL)
5488 return -1;
5489
5490 switch (type) {
5491 case NFT_DATA_VALUE:
5492 err = nft_value_dump(skb, data, len);
5493 break;
5494 case NFT_DATA_VERDICT:
33d5a7b1 5495 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5496 break;
5497 default:
5498 err = -EINVAL;
5499 WARN_ON(1);
5500 }
5501
5502 nla_nest_end(skb, nest);
5503 return err;
5504}
5505EXPORT_SYMBOL_GPL(nft_data_dump);
5506
df05ef87 5507static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5508{
5509 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5510 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5511 net->nft.base_seq = 1;
99633ab2
PNA		 5512 return 0;
5513}
5514
5ebe0b0e
PNA		 5515int __nft_release_basechain(struct nft_ctx *ctx)
5516{
5517 struct nft_rule *rule, *nr;
5518
5519 BUG_ON(!(ctx->chain->flags & NFT_BASE_CHAIN));
5520
82bec71d 5521 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 5522 ctx->afi->nops);
5523 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5524 list_del(&rule->list);
5525 ctx->chain->use--;
5526 nf_tables_rule_destroy(ctx, rule);
5527 }
5528 list_del(&ctx->chain->list);
5529 ctx->table->use--;
5530 nf_tables_chain_destroy(ctx->chain);
5531
5532 return 0;
5533}
5534EXPORT_SYMBOL_GPL(__nft_release_basechain);
5535
df05ef87
PNA		 5536/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5537static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5538{
5539 struct nft_table *table, *nt;
5540 struct nft_chain *chain, *nc;
e5009240 5541 struct nft_object *obj, *ne;
df05ef87
PNA		 5542 struct nft_rule *rule, *nr;
5543 struct nft_set *set, *ns;
5544 struct nft_ctx ctx = {
5545 .net = net,
5546 .afi = afi,
5547 };
5548
5549 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5550 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 5551 nf_tables_unregister_hooks(net, table, chain,
5552 afi->nops);
df05ef87
PNA		 5553 /* No packets are walking on these chains anymore. */
5554 ctx.table = table;
5555 list_for_each_entry(chain, &table->chains, list) {
5556 ctx.chain = chain;
5557 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5558 list_del(&rule->list);
5559 chain->use--;
5560 nf_tables_rule_destroy(&ctx, rule);
5561 }
5562 }
5563 list_for_each_entry_safe(set, ns, &table->sets, list) {
5564 list_del(&set->list);
5565 table->use--;
5566 nft_set_destroy(set);
5567 }
e5009240
PNA		 5568 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5569 list_del(&obj->list);
5570 table->use--;
5571 nft_obj_destroy(obj);
5572 }
df05ef87
PNA		 5573 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5574 list_del(&chain->list);
5575 table->use--;
5576 nf_tables_chain_destroy(chain);
5577 }
5578 list_del(&table->list);
5579 nf_tables_table_destroy(&ctx);
5580 }
5581}
5582
99633ab2
PNA		 5583static struct pernet_operations nf_tables_net_ops = {
5584 .init = nf_tables_init_net,
5585};
5586
96518518
PM		 5587static int __init nf_tables_module_init(void)
5588{
5589 int err;
5590
5591 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5592 GFP_KERNEL);
5593 if (info == NULL) {
5594 err = -ENOMEM;
5595 goto err1;
5596 }
5597
5598 err = nf_tables_core_module_init();
5599 if (err < 0)
5600 goto err2;
5601
5602 err = nfnetlink_subsys_register(&nf_tables_subsys);
5603 if (err < 0)
5604 goto err3;
5605
5606 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5607 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5608err3:
5609 nf_tables_core_module_exit();
5610err2:
5611 kfree(info);
5612err1:
5613 return err;
5614}
5615
5616static void __exit nf_tables_module_exit(void)
5617{
99633ab2 5618 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5619 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5620 rcu_barrier();
96518518
PM		 5621 nf_tables_core_module_exit();
5622 kfree(info);
5623}
5624
5625module_init(nf_tables_module_init);
5626module_exit(nf_tables_module_exit);
5627
5628MODULE_LICENSE("GPL");
5629MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5630MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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