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netfilter: nf_tables: Allow set names of up to 255 chars
[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>
1ff75a3e 16#include <linux/vmalloc.h>
96518518
PM		 17#include <linux/netfilter.h>
18#include <linux/netfilter/nfnetlink.h>
19#include <linux/netfilter/nf_tables.h>
20#include <net/netfilter/nf_tables_core.h>
21#include <net/netfilter/nf_tables.h>
99633ab2 22#include <net/net_namespace.h>
96518518
PM		 23#include <net/sock.h>
24
96518518 25static LIST_HEAD(nf_tables_expressions);
e5009240 26static LIST_HEAD(nf_tables_objects);
96518518
PM		 27
28/**
29 * nft_register_afinfo - register nf_tables address family info
30 *
31 * @afi: address family info to register
32 *
33 * Register the address family for use with nf_tables. Returns zero on
34 * success or a negative errno code otherwise.
35 */
99633ab2 36int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 37{
38 INIT_LIST_HEAD(&afi->tables);
39 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 40 list_add_tail_rcu(&afi->list, &net->nft.af_info);
96518518
PM		 41 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
42 return 0;
43}
44EXPORT_SYMBOL_GPL(nft_register_afinfo);
45
df05ef87
PNA		 46static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
47
96518518
PM		 48/**
49 * nft_unregister_afinfo - unregister nf_tables address family info
50 *
51 * @afi: address family info to unregister
52 *
53 * Unregister the address family for use with nf_tables.
54 */
df05ef87 55void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
96518518
PM		 56{
57 nfnl_lock(NFNL_SUBSYS_NFTABLES);
df05ef87 58 __nft_release_afinfo(net, afi);
e688a7f8 59 list_del_rcu(&afi->list);
96518518
PM		 60 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
61}
62EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
63
99633ab2 64static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
96518518
PM		 65{
66 struct nft_af_info *afi;
67
99633ab2 68 list_for_each_entry(afi, &net->nft.af_info, list) {
96518518
PM		 69 if (afi->family == family)
70 return afi;
71 }
72 return NULL;
73}
74
99633ab2
PNA		 75static struct nft_af_info *
76nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
96518518
PM		 77{
78 struct nft_af_info *afi;
79
99633ab2 80 afi = nft_afinfo_lookup(net, family);
96518518
PM		 81 if (afi != NULL)
82 return afi;
83#ifdef CONFIG_MODULES
84 if (autoload) {
85 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
86 request_module("nft-afinfo-%u", family);
87 nfnl_lock(NFNL_SUBSYS_NFTABLES);
99633ab2 88 afi = nft_afinfo_lookup(net, family);
96518518
PM		 89 if (afi != NULL)
90 return ERR_PTR(-EAGAIN);
91 }
92#endif
93 return ERR_PTR(-EAFNOSUPPORT);
94}
95
7c95f6d8 96static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 97 struct net *net,
7c95f6d8
PNA		 98 const struct sk_buff *skb,
99 const struct nlmsghdr *nlh,
100 struct nft_af_info *afi,
101 struct nft_table *table,
102 struct nft_chain *chain,
103 const struct nlattr * const *nla)
104{
633c9a84 105 ctx->net = net;
128ad332
PNA		 106 ctx->afi = afi;
107 ctx->table = table;
108 ctx->chain = chain;
109 ctx->nla = nla;
110 ctx->portid = NETLINK_CB(skb).portid;
111 ctx->report = nlmsg_report(nlh);
112 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 113}
114
8411b644
PNA		 115static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
116 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 117{
118 struct nft_trans *trans;
119
8411b644 120 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 121 if (trans == NULL)
122 return NULL;
123
b380e5c7 124 trans->msg_type = msg_type;
1081d11b
PNA		 125 trans->ctx = *ctx;
126
127 return trans;
128}
129
8411b644
PNA		 130static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
131 int msg_type, u32 size)
132{
133 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
134}
135
1081d11b
PNA		 136static void nft_trans_destroy(struct nft_trans *trans)
137{
138 list_del(&trans->list);
139 kfree(trans);
140}
141
82bec71d
PNA		 142static int nf_tables_register_hooks(struct net *net,
143 const struct nft_table *table,
d8ee8f7c
PNA		 144 struct nft_chain *chain,
145 unsigned int hook_nops)
146{
147 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 148 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 149 return 0;
150
82bec71d
PNA		 151 return nf_register_net_hooks(net, nft_base_chain(chain)->ops,
152 hook_nops);
d8ee8f7c
PNA		 153}
154
82bec71d
PNA		 155static void nf_tables_unregister_hooks(struct net *net,
156 const struct nft_table *table,
d8ee8f7c 157 struct nft_chain *chain,
c5598794
AB		 158 unsigned int hook_nops)
159{
d8ee8f7c 160 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 161 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 162 return;
163
82bec71d 164 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops, hook_nops);
c5598794
AB		 165}
166
ee01d542
AB		 167static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
168{
169 struct nft_trans *trans;
170
171 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
172 if (trans == NULL)
173 return -ENOMEM;
174
175 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 176 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 177
178 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
179 return 0;
180}
181
182static int nft_deltable(struct nft_ctx *ctx)
183{
184 int err;
185
186 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
187 if (err < 0)
188 return err;
189
f2a6d766 190 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 191 return err;
192}
193
194static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
195{
196 struct nft_trans *trans;
197
198 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
199 if (trans == NULL)
200 return -ENOMEM;
201
202 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 203 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 204
205 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
206 return 0;
207}
208
209static int nft_delchain(struct nft_ctx *ctx)
210{
211 int err;
212
213 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
214 if (err < 0)
215 return err;
216
217 ctx->table->use--;
664b0f8c 218 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542
AB		 219
220 return err;
221}
222
ee01d542
AB		 223static int
224nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
225{
226 /* You cannot delete the same rule twice */
889f7ee7
PNA		 227 if (nft_is_active_next(ctx->net, rule)) {
228 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 229 ctx->chain->use--;
230 return 0;
231 }
232 return -ENOENT;
233}
234
235static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
236 struct nft_rule *rule)
237{
238 struct nft_trans *trans;
239
240 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
241 if (trans == NULL)
242 return NULL;
243
1a94e38d
PNA		 244 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
245 nft_trans_rule_id(trans) =
246 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
247 }
ee01d542
AB		 248 nft_trans_rule(trans) = rule;
249 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
250
251 return trans;
252}
253
254static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
255{
256 struct nft_trans *trans;
257 int err;
258
259 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
260 if (trans == NULL)
261 return -ENOMEM;
262
263 err = nf_tables_delrule_deactivate(ctx, rule);
264 if (err < 0) {
265 nft_trans_destroy(trans);
266 return err;
267 }
268
269 return 0;
270}
271
272static int nft_delrule_by_chain(struct nft_ctx *ctx)
273{
274 struct nft_rule *rule;
275 int err;
276
277 list_for_each_entry(rule, &ctx->chain->rules, list) {
278 err = nft_delrule(ctx, rule);
279 if (err < 0)
280 return err;
281 }
282 return 0;
283}
284
ee01d542
AB		 285static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
286 struct nft_set *set)
287{
288 struct nft_trans *trans;
289
290 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
291 if (trans == NULL)
292 return -ENOMEM;
293
294 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
295 nft_trans_set_id(trans) =
296 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 297 nft_activate_next(ctx->net, set);
ee01d542
AB		 298 }
299 nft_trans_set(trans) = set;
300 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
301
302 return 0;
303}
304
305static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
306{
307 int err;
308
309 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
310 if (err < 0)
311 return err;
312
37a9cc52 313 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 314 ctx->table->use--;
315
316 return err;
317}
318
e5009240
PNA		 319static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
320 struct nft_object *obj)
321{
322 struct nft_trans *trans;
323
324 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
325 if (trans == NULL)
326 return -ENOMEM;
327
328 if (msg_type == NFT_MSG_NEWOBJ)
329 nft_activate_next(ctx->net, obj);
330
331 nft_trans_obj(trans) = obj;
332 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
333
334 return 0;
335}
336
337static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
338{
339 int err;
340
341 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
342 if (err < 0)
343 return err;
344
345 nft_deactivate_next(ctx->net, obj);
346 ctx->table->use--;
347
348 return err;
349}
350
96518518
PM		 351/*
352 * Tables
353 */
354
355static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 356 const struct nlattr *nla,
357 u8 genmask)
96518518
PM		 358{
359 struct nft_table *table;
360
361 list_for_each_entry(table, &afi->tables, list) {
f2a6d766
PNA		 362 if (!nla_strcmp(nla, table->name) &&
363 nft_active_genmask(table, genmask))
96518518
PM		 364 return table;
365 }
366 return NULL;
367}
368
369static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
f2a6d766
PNA		 370 const struct nlattr *nla,
371 u8 genmask)
96518518
PM		 372{
373 struct nft_table *table;
374
375 if (nla == NULL)
376 return ERR_PTR(-EINVAL);
377
f2a6d766 378 table = nft_table_lookup(afi, nla, genmask);
96518518
PM		 379 if (table != NULL)
380 return table;
381
96518518
PM		 382 return ERR_PTR(-ENOENT);
383}
384
385static inline u64 nf_tables_alloc_handle(struct nft_table *table)
386{
387 return ++table->hgenerator;
388}
389
d8297d4f 390static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 391
2a37d755 392static const struct nf_chain_type *
baae3e62 393__nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
9370761c
PNA		 394{
395 int i;
396
baae3e62 397 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 398 if (chain_type[family][i] != NULL &&
399 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 400 return chain_type[family][i];
9370761c 401 }
baae3e62 402 return NULL;
9370761c
PNA		 403}
404
2a37d755 405static const struct nf_chain_type *
baae3e62
PM		 406nf_tables_chain_type_lookup(const struct nft_af_info *afi,
407 const struct nlattr *nla,
408 bool autoload)
9370761c 409{
2a37d755 410 const struct nf_chain_type *type;
9370761c
PNA		 411
412 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 413 if (type != NULL)
414 return type;
9370761c 415#ifdef CONFIG_MODULES
93b0806f 416 if (autoload) {
9370761c 417 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2fec6bb6
PNA		 418 request_module("nft-chain-%u-%.*s", afi->family,
419 nla_len(nla), (const char *)nla_data(nla));
9370761c
PNA		 420 nfnl_lock(NFNL_SUBSYS_NFTABLES);
421 type = __nf_tables_chain_type_lookup(afi->family, nla);
93b0806f
PM		 422 if (type != NULL)
423 return ERR_PTR(-EAGAIN);
9370761c
PNA		 424 }
425#endif
93b0806f 426 return ERR_PTR(-ENOENT);
9370761c
PNA		 427}
428
96518518 429static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 430 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
431 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 432 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
96518518
PM		 433};
434
84d7fce6
PNA		 435static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
436 u32 portid, u32 seq, int event, u32 flags,
437 int family, const struct nft_table *table)
96518518
PM		 438{
439 struct nlmsghdr *nlh;
440 struct nfgenmsg *nfmsg;
441
dedb67c4 442 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 443 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
444 if (nlh == NULL)
445 goto nla_put_failure;
446
447 nfmsg = nlmsg_data(nlh);
448 nfmsg->nfgen_family = family;
449 nfmsg->version = NFNETLINK_V0;
84d7fce6 450 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 451
9ddf6323 452 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768
TB		 453 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
454 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
96518518
PM		 455 goto nla_put_failure;
456
053c095a
JB		 457 nlmsg_end(skb, nlh);
458 return 0;
96518518
PM		 459
460nla_put_failure:
461 nlmsg_trim(skb, nlh);
462 return -1;
463}
464
25e94a99 465static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 466{
467 struct sk_buff *skb;
96518518
PM		 468 int err;
469
128ad332
PNA		 470 if (!ctx->report &&
471 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 472 return;
96518518 473
96518518
PM		 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
25e94a99
PNA		 485 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
486 ctx->report, GFP_KERNEL);
487 return;
96518518 488err:
25e94a99 489 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 490}
491
492static int nf_tables_dump_tables(struct sk_buff *skb,
493 struct netlink_callback *cb)
494{
495 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
496 const struct nft_af_info *afi;
497 const struct nft_table *table;
498 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 499 struct net *net = sock_net(skb->sk);
96518518
PM		 500 int family = nfmsg->nfgen_family;
501
e688a7f8 502 rcu_read_lock();
38e029f1
PNA		 503 cb->seq = net->nft.base_seq;
504
e688a7f8 505 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 506 if (family != NFPROTO_UNSPEC && family != afi->family)
507 continue;
508
e688a7f8 509 list_for_each_entry_rcu(table, &afi->tables, list) {
96518518
PM		 510 if (idx < s_idx)
511 goto cont;
512 if (idx > s_idx)
513 memset(&cb->args[1], 0,
514 sizeof(cb->args) - sizeof(cb->args[0]));
f2a6d766
PNA		 515 if (!nft_is_active(net, table))
516 continue;
84d7fce6 517 if (nf_tables_fill_table_info(skb, net,
96518518
PM		 518 NETLINK_CB(cb->skb).portid,
519 cb->nlh->nlmsg_seq,
520 NFT_MSG_NEWTABLE,
521 NLM_F_MULTI,
522 afi->family, table) < 0)
523 goto done;
38e029f1
PNA		 524
525 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 526cont:
527 idx++;
528 }
529 }
530done:
e688a7f8 531 rcu_read_unlock();
96518518
PM		 532 cb->args[0] = idx;
533 return skb->len;
534}
535
7b8002a1
PNA		 536static int nf_tables_gettable(struct net *net, struct sock *nlsk,
537 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 538 const struct nlattr * const nla[],
539 struct netlink_ext_ack *extack)
96518518
PM		 540{
541 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 542 u8 genmask = nft_genmask_cur(net);
96518518
PM		 543 const struct nft_af_info *afi;
544 const struct nft_table *table;
545 struct sk_buff *skb2;
546 int family = nfmsg->nfgen_family;
547 int err;
548
549 if (nlh->nlmsg_flags & NLM_F_DUMP) {
550 struct netlink_dump_control c = {
551 .dump = nf_tables_dump_tables,
552 };
553 return netlink_dump_start(nlsk, skb, nlh, &c);
554 }
555
99633ab2 556 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 557 if (IS_ERR(afi))
558 return PTR_ERR(afi);
559
f2a6d766 560 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 561 if (IS_ERR(table))
562 return PTR_ERR(table);
563
564 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
565 if (!skb2)
566 return -ENOMEM;
567
84d7fce6 568 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 569 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
570 family, table);
571 if (err < 0)
572 goto err;
573
574 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
575
576err:
577 kfree_skb(skb2);
578 return err;
579}
580
10435c11
F		 581static void _nf_tables_table_disable(struct net *net,
582 const struct nft_af_info *afi,
583 struct nft_table *table,
584 u32 cnt)
585{
586 struct nft_chain *chain;
587 u32 i = 0;
588
589 list_for_each_entry(chain, &table->chains, list) {
590 if (!nft_is_active_next(net, chain))
591 continue;
f323d954 592 if (!nft_is_base_chain(chain))
10435c11
F		 593 continue;
594
595 if (cnt && i++ == cnt)
596 break;
597
598 nf_unregister_net_hooks(net, nft_base_chain(chain)->ops,
599 afi->nops);
600 }
601}
602
664b0f8c
PNA		 603static int nf_tables_table_enable(struct net *net,
604 const struct nft_af_info *afi,
115a60b1 605 struct nft_table *table)
9ddf6323
PNA		 606{
607 struct nft_chain *chain;
608 int err, i = 0;
609
610 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 611 if (!nft_is_active_next(net, chain))
612 continue;
f323d954 613 if (!nft_is_base_chain(chain))
d2012975
PNA		 614 continue;
615
82bec71d
PNA		 616 err = nf_register_net_hooks(net, nft_base_chain(chain)->ops,
617 afi->nops);
9ddf6323
PNA		 618 if (err < 0)
619 goto err;
620
621 i++;
622 }
623 return 0;
624err:
10435c11
F		 625 if (i)
626 _nf_tables_table_disable(net, afi, table, i);
9ddf6323
PNA		 627 return err;
628}
629
664b0f8c
PNA		 630static void nf_tables_table_disable(struct net *net,
631 const struct nft_af_info *afi,
d8ee8f7c 632 struct nft_table *table)
9ddf6323 633{
10435c11 634 _nf_tables_table_disable(net, afi, table, 0);
9ddf6323
PNA		 635}
636
e1aaca93 637static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 638{
55dd6f93 639 struct nft_trans *trans;
e1aaca93 640 u32 flags;
55dd6f93 641 int ret = 0;
9ddf6323 642
e1aaca93
PNA		 643 if (!ctx->nla[NFTA_TABLE_FLAGS])
644 return 0;
9ddf6323 645
e1aaca93
PNA		 646 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
647 if (flags & ~NFT_TABLE_F_DORMANT)
648 return -EINVAL;
649
63283dd2
PNA		 650 if (flags == ctx->table->flags)
651 return 0;
652
55dd6f93
PNA		 653 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
654 sizeof(struct nft_trans_table));
655 if (trans == NULL)
656 return -ENOMEM;
9ddf6323 657
e1aaca93
PNA		 658 if ((flags & NFT_TABLE_F_DORMANT) &&
659 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 660 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 661 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
662 ctx->table->flags & NFT_TABLE_F_DORMANT) {
664b0f8c 663 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
55dd6f93 664 if (ret >= 0) {
e1aaca93 665 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 666 nft_trans_table_enable(trans) = true;
9ddf6323 667 }
9ddf6323 668 }
e1aaca93
PNA		 669 if (ret < 0)
670 goto err;
9ddf6323 671
55dd6f93
PNA		 672 nft_trans_table_update(trans) = true;
673 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
674 return 0;
9ddf6323 675err:
55dd6f93 676 nft_trans_destroy(trans);
9ddf6323
PNA		 677 return ret;
678}
679
633c9a84
PNA		 680static int nf_tables_newtable(struct net *net, struct sock *nlsk,
681 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 682 const struct nlattr * const nla[],
683 struct netlink_ext_ack *extack)
96518518
PM		 684{
685 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 686 u8 genmask = nft_genmask_next(net);
96518518
PM		 687 const struct nlattr *name;
688 struct nft_af_info *afi;
689 struct nft_table *table;
690 int family = nfmsg->nfgen_family;
c5c1f975 691 u32 flags = 0;
e1aaca93 692 struct nft_ctx ctx;
55dd6f93 693 int err;
96518518 694
99633ab2 695 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 696 if (IS_ERR(afi))
697 return PTR_ERR(afi);
698
699 name = nla[NFTA_TABLE_NAME];
f2a6d766 700 table = nf_tables_table_lookup(afi, name, genmask);
96518518
PM		 701 if (IS_ERR(table)) {
702 if (PTR_ERR(table) != -ENOENT)
703 return PTR_ERR(table);
1a28ad74 704 } else {
96518518
PM		 705 if (nlh->nlmsg_flags & NLM_F_EXCL)
706 return -EEXIST;
707 if (nlh->nlmsg_flags & NLM_F_REPLACE)
708 return -EOPNOTSUPP;
e1aaca93 709
633c9a84 710 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
e1aaca93 711 return nf_tables_updtable(&ctx);
96518518
PM		 712 }
713
c5c1f975
PM		 714 if (nla[NFTA_TABLE_FLAGS]) {
715 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
716 if (flags & ~NFT_TABLE_F_DORMANT)
717 return -EINVAL;
718 }
719
ebddf1a8 720 err = -EAFNOSUPPORT;
7047f9d0 721 if (!try_module_get(afi->owner))
ebddf1a8 722 goto err1;
7047f9d0 723
ffdb210e 724 err = -ENOMEM;
1cae565e 725 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 726 if (table == NULL)
ebddf1a8 727 goto err2;
96518518 728
e46abbcc
PS		 729 table->name = nla_strdup(name, GFP_KERNEL);
730 if (table->name == NULL)
731 goto err3;
732
96518518 733 INIT_LIST_HEAD(&table->chains);
20a69341 734 INIT_LIST_HEAD(&table->sets);
e5009240 735 INIT_LIST_HEAD(&table->objects);
c5c1f975 736 table->flags = flags;
9ddf6323 737
633c9a84 738 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
55dd6f93 739 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 740 if (err < 0)
e46abbcc 741 goto err4;
ffdb210e 742
e688a7f8 743 list_add_tail_rcu(&table->list, &afi->tables);
96518518 744 return 0;
e46abbcc
PS		 745err4:
746 kfree(table->name);
ebddf1a8 747err3:
ffdb210e 748 kfree(table);
ebddf1a8 749err2:
ffdb210e 750 module_put(afi->owner);
ebddf1a8 751err1:
ffdb210e 752 return err;
96518518
PM		 753}
754
b9ac12ef
AB		 755static int nft_flush_table(struct nft_ctx *ctx)
756{
757 int err;
758 struct nft_chain *chain, *nc;
e5009240 759 struct nft_object *obj, *ne;
b9ac12ef
AB		 760 struct nft_set *set, *ns;
761
a2f18db0 762 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 763 if (!nft_is_active_next(ctx->net, chain))
764 continue;
765
b9ac12ef
AB		 766 ctx->chain = chain;
767
768 err = nft_delrule_by_chain(ctx);
769 if (err < 0)
770 goto out;
b9ac12ef
AB		 771 }
772
773 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 774 if (!nft_is_active_next(ctx->net, set))
775 continue;
776
b9ac12ef
AB		 777 if (set->flags & NFT_SET_ANONYMOUS &&
778 !list_empty(&set->bindings))
779 continue;
780
781 err = nft_delset(ctx, set);
782 if (err < 0)
783 goto out;
784 }
785
e5009240
PNA		 786 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
787 err = nft_delobj(ctx, obj);
788 if (err < 0)
789 goto out;
790 }
791
a2f18db0 792 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 793 if (!nft_is_active_next(ctx->net, chain))
794 continue;
795
a2f18db0
PNA		 796 ctx->chain = chain;
797
798 err = nft_delchain(ctx);
799 if (err < 0)
800 goto out;
801 }
802
b9ac12ef
AB		 803 err = nft_deltable(ctx);
804out:
805 return err;
806}
807
808static int nft_flush(struct nft_ctx *ctx, int family)
809{
810 struct nft_af_info *afi;
811 struct nft_table *table, *nt;
812 const struct nlattr * const *nla = ctx->nla;
813 int err = 0;
814
815 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
816 if (family != AF_UNSPEC && afi->family != family)
817 continue;
818
819 ctx->afi = afi;
820 list_for_each_entry_safe(table, nt, &afi->tables, list) {
f2a6d766
PNA		 821 if (!nft_is_active_next(ctx->net, table))
822 continue;
823
b9ac12ef
AB		 824 if (nla[NFTA_TABLE_NAME] &&
825 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
826 continue;
827
828 ctx->table = table;
829
830 err = nft_flush_table(ctx);
831 if (err < 0)
832 goto out;
833 }
834 }
835out:
836 return err;
837}
838
633c9a84
PNA		 839static int nf_tables_deltable(struct net *net, struct sock *nlsk,
840 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 841 const struct nlattr * const nla[],
842 struct netlink_ext_ack *extack)
96518518
PM		 843{
844 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 845 u8 genmask = nft_genmask_next(net);
96518518
PM		 846 struct nft_af_info *afi;
847 struct nft_table *table;
ee01d542 848 int family = nfmsg->nfgen_family;
55dd6f93 849 struct nft_ctx ctx;
96518518 850
633c9a84 851 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
b9ac12ef
AB		 852 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
853 return nft_flush(&ctx, family);
854
99633ab2 855 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 856 if (IS_ERR(afi))
857 return PTR_ERR(afi);
858
f2a6d766 859 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
96518518
PM		 860 if (IS_ERR(table))
861 return PTR_ERR(table);
96518518 862
b9ac12ef
AB		 863 ctx.afi = afi;
864 ctx.table = table;
55dd6f93 865
b9ac12ef 866 return nft_flush_table(&ctx);
96518518
PM		 867}
868
55dd6f93
PNA		 869static void nf_tables_table_destroy(struct nft_ctx *ctx)
870{
4fefee57
PNA		 871 BUG_ON(ctx->table->use > 0);
872
e46abbcc 873 kfree(ctx->table->name);
55dd6f93
PNA		 874 kfree(ctx->table);
875 module_put(ctx->afi->owner);
876}
877
2a37d755 878int nft_register_chain_type(const struct nf_chain_type *ctype)
96518518 879{
9370761c 880 int err = 0;
96518518 881
d8297d4f
FW		 882 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
883 return -EINVAL;
884
96518518 885 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c
PNA		 886 if (chain_type[ctype->family][ctype->type] != NULL) {
887 err = -EBUSY;
888 goto out;
96518518 889 }
9370761c
PNA		 890 chain_type[ctype->family][ctype->type] = ctype;
891out:
96518518
PM		 892 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
893 return err;
894}
9370761c 895EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 896
2a37d755 897void nft_unregister_chain_type(const struct nf_chain_type *ctype)
96518518 898{
96518518 899 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 900 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 901 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
902}
9370761c 903EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 904
905/*
906 * Chains
907 */
908
909static struct nft_chain *
664b0f8c
PNA		 910nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
911 u8 genmask)
96518518
PM		 912{
913 struct nft_chain *chain;
914
915 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 916 if (chain->handle == handle &&
917 nft_active_genmask(chain, genmask))
96518518
PM		 918 return chain;
919 }
920
921 return ERR_PTR(-ENOENT);
922}
923
924static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
664b0f8c
PNA		 925 const struct nlattr *nla,
926 u8 genmask)
96518518
PM		 927{
928 struct nft_chain *chain;
929
930 if (nla == NULL)
931 return ERR_PTR(-EINVAL);
932
933 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 934 if (!nla_strcmp(nla, chain->name) &&
935 nft_active_genmask(chain, genmask))
96518518
PM		 936 return chain;
937 }
938
939 return ERR_PTR(-ENOENT);
940}
941
942static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 943 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
944 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 945 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
946 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
947 .len = NFT_CHAIN_MAXNAMELEN - 1 },
948 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 949 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 950 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 951 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 952};
953
954static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
955 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
956 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 957 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
958 .len = IFNAMSIZ - 1 },
96518518
PM		 959};
960
0ca743a5
PNA		 961static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
962{
963 struct nft_stats *cpu_stats, total;
964 struct nlattr *nest;
ce355e20
ED		 965 unsigned int seq;
966 u64 pkts, bytes;
0ca743a5
PNA		 967 int cpu;
968
969 memset(&total, 0, sizeof(total));
970 for_each_possible_cpu(cpu) {
971 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 972 do {
973 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
974 pkts = cpu_stats->pkts;
975 bytes = cpu_stats->bytes;
976 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
977 total.pkts += pkts;
978 total.bytes += bytes;
0ca743a5
PNA		 979 }
980 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
981 if (nest == NULL)
982 goto nla_put_failure;
983
b46f6ded
ND		 984 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
985 NFTA_COUNTER_PAD) ||
986 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
987 NFTA_COUNTER_PAD))
0ca743a5
PNA		 988 goto nla_put_failure;
989
990 nla_nest_end(skb, nest);
991 return 0;
992
993nla_put_failure:
994 return -ENOSPC;
995}
996
84d7fce6
PNA		 997static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
998 u32 portid, u32 seq, int event, u32 flags,
999 int family, const struct nft_table *table,
96518518
PM		 1000 const struct nft_chain *chain)
1001{
1002 struct nlmsghdr *nlh;
1003 struct nfgenmsg *nfmsg;
1004
dedb67c4 1005 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1006 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1007 if (nlh == NULL)
1008 goto nla_put_failure;
1009
1010 nfmsg = nlmsg_data(nlh);
1011 nfmsg->nfgen_family = family;
1012 nfmsg->version = NFNETLINK_V0;
84d7fce6 1013 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1014
1015 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1016 goto nla_put_failure;
b46f6ded
ND		 1017 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1018 NFTA_CHAIN_PAD))
96518518
PM		 1019 goto nla_put_failure;
1020 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1021 goto nla_put_failure;
1022
f323d954 1023 if (nft_is_base_chain(chain)) {
0ca743a5 1024 const struct nft_base_chain *basechain = nft_base_chain(chain);
115a60b1 1025 const struct nf_hook_ops *ops = &basechain->ops[0];
0ca743a5
PNA		 1026 struct nlattr *nest;
1027
1028 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 1029 if (nest == NULL)
1030 goto nla_put_failure;
1031 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1032 goto nla_put_failure;
1033 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1034 goto nla_put_failure;
2cbce139
PNA		 1035 if (basechain->dev_name[0] &&
1036 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1037 goto nla_put_failure;
96518518 1038 nla_nest_end(skb, nest);
9370761c 1039
0ca743a5
PNA		 1040 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1041 htonl(basechain->policy)))
1042 goto nla_put_failure;
1043
baae3e62
PM		 1044 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1045 goto nla_put_failure;
0ca743a5
PNA		 1046
1047 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
1048 goto nla_put_failure;
96518518
PM		 1049 }
1050
0ca743a5
PNA		 1051 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1052 goto nla_put_failure;
1053
053c095a
JB		 1054 nlmsg_end(skb, nlh);
1055 return 0;
96518518
PM		 1056
1057nla_put_failure:
1058 nlmsg_trim(skb, nlh);
1059 return -1;
1060}
1061
25e94a99 1062static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1063{
1064 struct sk_buff *skb;
96518518
PM		 1065 int err;
1066
128ad332
PNA		 1067 if (!ctx->report &&
1068 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1069 return;
96518518 1070
96518518
PM		 1071 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1072 if (skb == NULL)
1073 goto err;
1074
84d7fce6
PNA		 1075 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1076 event, 0, ctx->afi->family, ctx->table,
35151d84 1077 ctx->chain);
96518518
PM		 1078 if (err < 0) {
1079 kfree_skb(skb);
1080 goto err;
1081 }
1082
25e94a99
PNA		 1083 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1084 ctx->report, GFP_KERNEL);
1085 return;
96518518 1086err:
25e94a99 1087 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1088}
1089
1090static int nf_tables_dump_chains(struct sk_buff *skb,
1091 struct netlink_callback *cb)
1092{
1093 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1094 const struct nft_af_info *afi;
1095 const struct nft_table *table;
1096 const struct nft_chain *chain;
1097 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1098 struct net *net = sock_net(skb->sk);
96518518
PM		 1099 int family = nfmsg->nfgen_family;
1100
e688a7f8 1101 rcu_read_lock();
38e029f1
PNA		 1102 cb->seq = net->nft.base_seq;
1103
e688a7f8 1104 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 1105 if (family != NFPROTO_UNSPEC && family != afi->family)
1106 continue;
1107
e688a7f8
PNA		 1108 list_for_each_entry_rcu(table, &afi->tables, list) {
1109 list_for_each_entry_rcu(chain, &table->chains, list) {
96518518
PM		 1110 if (idx < s_idx)
1111 goto cont;
1112 if (idx > s_idx)
1113 memset(&cb->args[1], 0,
1114 sizeof(cb->args) - sizeof(cb->args[0]));
664b0f8c
PNA		 1115 if (!nft_is_active(net, chain))
1116 continue;
84d7fce6
PNA		 1117 if (nf_tables_fill_chain_info(skb, net,
1118 NETLINK_CB(cb->skb).portid,
96518518
PM		 1119 cb->nlh->nlmsg_seq,
1120 NFT_MSG_NEWCHAIN,
1121 NLM_F_MULTI,
1122 afi->family, table, chain) < 0)
1123 goto done;
38e029f1
PNA		 1124
1125 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 1126cont:
1127 idx++;
1128 }
1129 }
1130 }
1131done:
e688a7f8 1132 rcu_read_unlock();
96518518
PM		 1133 cb->args[0] = idx;
1134 return skb->len;
1135}
1136
7b8002a1
PNA		 1137static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1138 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1139 const struct nlattr * const nla[],
1140 struct netlink_ext_ack *extack)
96518518
PM		 1141{
1142 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1143 u8 genmask = nft_genmask_cur(net);
96518518
PM		 1144 const struct nft_af_info *afi;
1145 const struct nft_table *table;
1146 const struct nft_chain *chain;
1147 struct sk_buff *skb2;
1148 int family = nfmsg->nfgen_family;
1149 int err;
1150
1151 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1152 struct netlink_dump_control c = {
1153 .dump = nf_tables_dump_chains,
1154 };
1155 return netlink_dump_start(nlsk, skb, nlh, &c);
1156 }
1157
99633ab2 1158 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1159 if (IS_ERR(afi))
1160 return PTR_ERR(afi);
1161
f2a6d766 1162 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1163 if (IS_ERR(table))
1164 return PTR_ERR(table);
1165
664b0f8c 1166 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1167 if (IS_ERR(chain))
1168 return PTR_ERR(chain);
1169
1170 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1171 if (!skb2)
1172 return -ENOMEM;
1173
84d7fce6 1174 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1175 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1176 family, table, chain);
1177 if (err < 0)
1178 goto err;
1179
1180 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1181
1182err:
1183 kfree_skb(skb2);
1184 return err;
1185}
1186
0ca743a5
PNA		 1187static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1188 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1189 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1190};
1191
ff3cd7b3 1192static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1193{
1194 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1195 struct nft_stats __percpu *newstats;
1196 struct nft_stats *stats;
1197 int err;
1198
fceb6435
JB		 1199 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1200 NULL);
0ca743a5 1201 if (err < 0)
ff3cd7b3 1202 return ERR_PTR(err);
0ca743a5
PNA		 1203
1204 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1205 return ERR_PTR(-EINVAL);
0ca743a5 1206
ce355e20 1207 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1208 if (newstats == NULL)
ff3cd7b3 1209 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1210
1211 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1212 * are not exposed to userspace.
1213 */
e8781f70 1214 preempt_disable();
0ca743a5
PNA		 1215 stats = this_cpu_ptr(newstats);
1216 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1217 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1218 preempt_enable();
0ca743a5 1219
ff3cd7b3
PNA		 1220 return newstats;
1221}
1222
1223static void nft_chain_stats_replace(struct nft_base_chain *chain,
1224 struct nft_stats __percpu *newstats)
1225{
b88825de
PNA		 1226 if (newstats == NULL)
1227 return;
1228
0ca743a5 1229 if (chain->stats) {
0ca743a5 1230 struct nft_stats __percpu *oldstats =
67a8fc27 1231 nft_dereference(chain->stats);
0ca743a5
PNA		 1232
1233 rcu_assign_pointer(chain->stats, newstats);
1234 synchronize_rcu();
1235 free_percpu(oldstats);
1236 } else
1237 rcu_assign_pointer(chain->stats, newstats);
0ca743a5
PNA		 1238}
1239
91c7b38d
PNA		 1240static void nf_tables_chain_destroy(struct nft_chain *chain)
1241{
1242 BUG_ON(chain->use > 0);
1243
f323d954 1244 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1245 struct nft_base_chain *basechain = nft_base_chain(chain);
1246
1247 module_put(basechain->type->owner);
1248 free_percpu(basechain->stats);
9f08ea84
PNA		 1249 if (basechain->stats)
1250 static_branch_dec(&nft_counters_enabled);
2cbce139
PNA		 1251 if (basechain->ops[0].dev != NULL)
1252 dev_put(basechain->ops[0].dev);
b7263e07 1253 kfree(chain->name);
2cbce139 1254 kfree(basechain);
91c7b38d 1255 } else {
b7263e07 1256 kfree(chain->name);
91c7b38d
PNA		 1257 kfree(chain);
1258 }
1259}
1260
508f8ccd
PNA		 1261struct nft_chain_hook {
1262 u32 num;
1263 u32 priority;
1264 const struct nf_chain_type *type;
1265 struct net_device *dev;
1266};
1267
1268static int nft_chain_parse_hook(struct net *net,
1269 const struct nlattr * const nla[],
1270 struct nft_af_info *afi,
1271 struct nft_chain_hook *hook, bool create)
1272{
1273 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1274 const struct nf_chain_type *type;
1275 struct net_device *dev;
1276 int err;
1277
1278 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
fceb6435 1279 nft_hook_policy, NULL);
508f8ccd
PNA		 1280 if (err < 0)
1281 return err;
1282
1283 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1284 ha[NFTA_HOOK_PRIORITY] == NULL)
1285 return -EINVAL;
1286
1287 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1288 if (hook->num >= afi->nhooks)
1289 return -EINVAL;
1290
1291 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1292
1293 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1294 if (nla[NFTA_CHAIN_TYPE]) {
1295 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1296 create);
1297 if (IS_ERR(type))
1298 return PTR_ERR(type);
1299 }
1300 if (!(type->hook_mask & (1 << hook->num)))
1301 return -EOPNOTSUPP;
1302 if (!try_module_get(type->owner))
1303 return -ENOENT;
1304
1305 hook->type = type;
1306
1307 hook->dev = NULL;
1308 if (afi->flags & NFT_AF_NEEDS_DEV) {
1309 char ifname[IFNAMSIZ];
1310
1311 if (!ha[NFTA_HOOK_DEV]) {
1312 module_put(type->owner);
1313 return -EOPNOTSUPP;
1314 }
1315
1316 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1317 dev = dev_get_by_name(net, ifname);
1318 if (!dev) {
1319 module_put(type->owner);
1320 return -ENOENT;
1321 }
1322 hook->dev = dev;
1323 } else if (ha[NFTA_HOOK_DEV]) {
1324 module_put(type->owner);
1325 return -EOPNOTSUPP;
1326 }
1327
1328 return 0;
1329}
1330
1331static void nft_chain_release_hook(struct nft_chain_hook *hook)
1332{
1333 module_put(hook->type->owner);
1334 if (hook->dev != NULL)
1335 dev_put(hook->dev);
1336}
1337
633c9a84
PNA		 1338static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1339 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1340 const struct nlattr * const nla[],
1341 struct netlink_ext_ack *extack)
96518518
PM		 1342{
1343 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1344 const struct nlattr * uninitialized_var(name);
7c95f6d8 1345 struct nft_af_info *afi;
96518518
PM		 1346 struct nft_table *table;
1347 struct nft_chain *chain;
0ca743a5 1348 struct nft_base_chain *basechain = NULL;
f2a6d766 1349 u8 genmask = nft_genmask_next(net);
96518518 1350 int family = nfmsg->nfgen_family;
57de2a0c 1351 u8 policy = NF_ACCEPT;
96518518 1352 u64 handle = 0;
115a60b1 1353 unsigned int i;
ff3cd7b3 1354 struct nft_stats __percpu *stats;
96518518
PM		 1355 int err;
1356 bool create;
91c7b38d 1357 struct nft_ctx ctx;
96518518
PM		 1358
1359 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1360
99633ab2 1361 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1362 if (IS_ERR(afi))
1363 return PTR_ERR(afi);
1364
f2a6d766 1365 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1366 if (IS_ERR(table))
1367 return PTR_ERR(table);
1368
96518518
PM		 1369 chain = NULL;
1370 name = nla[NFTA_CHAIN_NAME];
1371
1372 if (nla[NFTA_CHAIN_HANDLE]) {
1373 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1374 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1375 if (IS_ERR(chain))
1376 return PTR_ERR(chain);
1377 } else {
664b0f8c 1378 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1379 if (IS_ERR(chain)) {
1380 if (PTR_ERR(chain) != -ENOENT)
1381 return PTR_ERR(chain);
1382 chain = NULL;
1383 }
1384 }
1385
57de2a0c 1386 if (nla[NFTA_CHAIN_POLICY]) {
f323d954
PNA		 1387 if (chain != NULL &&
1388 !nft_is_base_chain(chain))
d6b6cb1d
PNA		 1389 return -EOPNOTSUPP;
1390
1391 if (chain == NULL &&
57de2a0c
PM		 1392 nla[NFTA_CHAIN_HOOK] == NULL)
1393 return -EOPNOTSUPP;
1394
8f46df18 1395 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1396 switch (policy) {
1397 case NF_DROP:
1398 case NF_ACCEPT:
1399 break;
1400 default:
1401 return -EINVAL;
1402 }
1403 }
1404
96518518 1405 if (chain != NULL) {
91c7b38d
PNA		 1406 struct nft_stats *stats = NULL;
1407 struct nft_trans *trans;
1408
96518518
PM		 1409 if (nlh->nlmsg_flags & NLM_F_EXCL)
1410 return -EEXIST;
1411 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1412 return -EOPNOTSUPP;
1413
6133740d
PNA		 1414 if (nla[NFTA_CHAIN_HOOK]) {
1415 struct nft_base_chain *basechain;
1416 struct nft_chain_hook hook;
1417 struct nf_hook_ops *ops;
1418
f323d954 1419 if (!nft_is_base_chain(chain))
6133740d
PNA		 1420 return -EBUSY;
1421
1422 err = nft_chain_parse_hook(net, nla, afi, &hook,
1423 create);
1424 if (err < 0)
1425 return err;
1426
1427 basechain = nft_base_chain(chain);
1428 if (basechain->type != hook.type) {
1429 nft_chain_release_hook(&hook);
1430 return -EBUSY;
1431 }
1432
1433 for (i = 0; i < afi->nops; i++) {
1434 ops = &basechain->ops[i];
1435 if (ops->hooknum != hook.num ||
1436 ops->priority != hook.priority ||
1437 ops->dev != hook.dev) {
1438 nft_chain_release_hook(&hook);
1439 return -EBUSY;
1440 }
1441 }
1442 nft_chain_release_hook(&hook);
1443 }
1444
664b0f8c
PNA		 1445 if (nla[NFTA_CHAIN_HANDLE] && name) {
1446 struct nft_chain *chain2;
1447
1448 chain2 = nf_tables_chain_lookup(table,
1449 nla[NFTA_CHAIN_NAME],
1450 genmask);
1451 if (IS_ERR(chain2))
1452 return PTR_ERR(chain2);
1453 }
96518518 1454
0ca743a5 1455 if (nla[NFTA_CHAIN_COUNTERS]) {
f323d954 1456 if (!nft_is_base_chain(chain))
0ca743a5
PNA		 1457 return -EOPNOTSUPP;
1458
ff3cd7b3
PNA		 1459 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1460 if (IS_ERR(stats))
1461 return PTR_ERR(stats);
0ca743a5
PNA		 1462 }
1463
633c9a84 1464 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1465 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1466 sizeof(struct nft_trans_chain));
f5553c19
PNA		 1467 if (trans == NULL) {
1468 free_percpu(stats);
91c7b38d 1469 return -ENOMEM;
f5553c19 1470 }
4401a862 1471
91c7b38d
PNA		 1472 nft_trans_chain_stats(trans) = stats;
1473 nft_trans_chain_update(trans) = true;
4401a862 1474
91c7b38d
PNA		 1475 if (nla[NFTA_CHAIN_POLICY])
1476 nft_trans_chain_policy(trans) = policy;
1477 else
1478 nft_trans_chain_policy(trans) = -1;
96518518 1479
91c7b38d 1480 if (nla[NFTA_CHAIN_HANDLE] && name) {
b7263e07
PS		 1481 nft_trans_chain_name(trans) =
1482 nla_strdup(name, GFP_KERNEL);
1483 if (!nft_trans_chain_name(trans)) {
1484 kfree(trans);
1485 free_percpu(stats);
1486 return -ENOMEM;
1487 }
91c7b38d
PNA		 1488 }
1489 list_add_tail(&trans->list, &net->nft.commit_list);
1490 return 0;
96518518
PM		 1491 }
1492
75820676
PM		 1493 if (table->use == UINT_MAX)
1494 return -EOVERFLOW;
1495
96518518 1496 if (nla[NFTA_CHAIN_HOOK]) {
508f8ccd 1497 struct nft_chain_hook hook;
96518518 1498 struct nf_hook_ops *ops;
9370761c 1499 nf_hookfn *hookfn;
96518518 1500
508f8ccd 1501 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
96518518
PM		 1502 if (err < 0)
1503 return err;
2cbce139 1504
96518518 1505 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19 1506 if (basechain == NULL) {
508f8ccd 1507 nft_chain_release_hook(&hook);
96518518 1508 return -ENOMEM;
f5553c19 1509 }
9370761c 1510
508f8ccd
PNA		 1511 if (hook.dev != NULL)
1512 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
2cbce139 1513
4401a862 1514 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1515 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1516 if (IS_ERR(stats)) {
508f8ccd 1517 nft_chain_release_hook(&hook);
4401a862 1518 kfree(basechain);
ff3cd7b3 1519 return PTR_ERR(stats);
4401a862 1520 }
ff3cd7b3 1521 basechain->stats = stats;
9f08ea84 1522 static_branch_inc(&nft_counters_enabled);
4401a862
PM		 1523 }
1524
508f8ccd
PNA		 1525 hookfn = hook.type->hooks[hook.num];
1526 basechain->type = hook.type;
96518518
PM		 1527 chain = &basechain->chain;
1528
115a60b1
PM		 1529 for (i = 0; i < afi->nops; i++) {
1530 ops = &basechain->ops[i];
1531 ops->pf = family;
508f8ccd
PNA		 1532 ops->hooknum = hook.num;
1533 ops->priority = hook.priority;
115a60b1
PM		 1534 ops->priv = chain;
1535 ops->hook = afi->hooks[ops->hooknum];
508f8ccd 1536 ops->dev = hook.dev;
115a60b1
PM		 1537 if (hookfn)
1538 ops->hook = hookfn;
1539 if (afi->hook_ops_init)
1540 afi->hook_ops_init(ops, i);
1541 }
96518518
PM		 1542
1543 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1544 basechain->policy = policy;
96518518
PM		 1545 } else {
1546 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1547 if (chain == NULL)
1548 return -ENOMEM;
1549 }
1550
1551 INIT_LIST_HEAD(&chain->rules);
1552 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1553 chain->table = table;
b7263e07
PS		 1554 chain->name = nla_strdup(name, GFP_KERNEL);
1555 if (!chain->name) {
1556 err = -ENOMEM;
1557 goto err1;
1558 }
96518518 1559
82bec71d 1560 err = nf_tables_register_hooks(net, table, chain, afi->nops);
d8ee8f7c
PNA		 1561 if (err < 0)
1562 goto err1;
96518518 1563
633c9a84 1564 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1565 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1566 if (err < 0)
1567 goto err2;
96518518 1568
4fefee57 1569 table->use++;
e688a7f8 1570 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1571 return 0;
1572err2:
82bec71d 1573 nf_tables_unregister_hooks(net, table, chain, afi->nops);
91c7b38d
PNA		 1574err1:
1575 nf_tables_chain_destroy(chain);
1576 return err;
96518518
PM		 1577}
1578
633c9a84
PNA		 1579static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1580 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1581 const struct nlattr * const nla[],
1582 struct netlink_ext_ack *extack)
96518518
PM		 1583{
1584 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1585 u8 genmask = nft_genmask_next(net);
7c95f6d8 1586 struct nft_af_info *afi;
96518518
PM		 1587 struct nft_table *table;
1588 struct nft_chain *chain;
1589 int family = nfmsg->nfgen_family;
91c7b38d 1590 struct nft_ctx ctx;
96518518 1591
99633ab2 1592 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1593 if (IS_ERR(afi))
1594 return PTR_ERR(afi);
1595
f2a6d766 1596 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1597 if (IS_ERR(table))
1598 return PTR_ERR(table);
1599
664b0f8c 1600 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1601 if (IS_ERR(chain))
1602 return PTR_ERR(chain);
4fefee57 1603 if (chain->use > 0)
96518518
PM		 1604 return -EBUSY;
1605
633c9a84 1606 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1607
ee01d542 1608 return nft_delchain(&ctx);
96518518
PM		 1609}
1610
96518518
PM		 1611/*
1612 * Expressions
1613 */
1614
1615/**
ef1f7df9
PM		 1616 * nft_register_expr - register nf_tables expr type
1617 * @ops: expr type
96518518 1618 *
ef1f7df9 1619 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1620 * success or a negative errno code otherwise.
1621 */
ef1f7df9 1622int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1623{
1624 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1625 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1626 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1627 else
e688a7f8 1628 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1629 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1630 return 0;
1631}
1632EXPORT_SYMBOL_GPL(nft_register_expr);
1633
1634/**
ef1f7df9
PM		 1635 * nft_unregister_expr - unregister nf_tables expr type
1636 * @ops: expr type
96518518 1637 *
ef1f7df9 1638 * Unregisters the expr typefor use with nf_tables.
96518518 1639 */
ef1f7df9 1640void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1641{
1642 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1643 list_del_rcu(&type->list);
96518518
PM		 1644 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1645}
1646EXPORT_SYMBOL_GPL(nft_unregister_expr);
1647
64d46806
PM		 1648static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1649 struct nlattr *nla)
96518518 1650{
ef1f7df9 1651 const struct nft_expr_type *type;
96518518 1652
ef1f7df9 1653 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1654 if (!nla_strcmp(nla, type->name) &&
1655 (!type->family || type->family == family))
ef1f7df9 1656 return type;
96518518
PM		 1657 }
1658 return NULL;
1659}
1660
64d46806
PM		 1661static const struct nft_expr_type *nft_expr_type_get(u8 family,
1662 struct nlattr *nla)
96518518 1663{
ef1f7df9 1664 const struct nft_expr_type *type;
96518518
PM		 1665
1666 if (nla == NULL)
1667 return ERR_PTR(-EINVAL);
1668
64d46806 1669 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1670 if (type != NULL && try_module_get(type->owner))
1671 return type;
96518518
PM		 1672
1673#ifdef CONFIG_MODULES
ef1f7df9 1674 if (type == NULL) {
64d46806
PM		 1675 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1676 request_module("nft-expr-%u-%.*s", family,
1677 nla_len(nla), (char *)nla_data(nla));
1678 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1679 if (__nft_expr_type_get(family, nla))
1680 return ERR_PTR(-EAGAIN);
1681
96518518
PM		 1682 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1683 request_module("nft-expr-%.*s",
1684 nla_len(nla), (char *)nla_data(nla));
1685 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1686 if (__nft_expr_type_get(family, nla))
96518518
PM		 1687 return ERR_PTR(-EAGAIN);
1688 }
1689#endif
1690 return ERR_PTR(-ENOENT);
1691}
1692
1693static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1694 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1695 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1696};
1697
1698static int nf_tables_fill_expr_info(struct sk_buff *skb,
1699 const struct nft_expr *expr)
1700{
ef1f7df9 1701 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1702 goto nla_put_failure;
1703
1704 if (expr->ops->dump) {
1705 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1706 if (data == NULL)
1707 goto nla_put_failure;
1708 if (expr->ops->dump(skb, expr) < 0)
1709 goto nla_put_failure;
1710 nla_nest_end(skb, data);
1711 }
1712
1713 return skb->len;
1714
1715nla_put_failure:
1716 return -1;
1717};
1718
0b2d8a7b
PM		 1719int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1720 const struct nft_expr *expr)
1721{
1722 struct nlattr *nest;
1723
1724 nest = nla_nest_start(skb, attr);
1725 if (!nest)
1726 goto nla_put_failure;
1727 if (nf_tables_fill_expr_info(skb, expr) < 0)
1728 goto nla_put_failure;
1729 nla_nest_end(skb, nest);
1730 return 0;
1731
1732nla_put_failure:
1733 return -1;
1734}
1735
96518518
PM		 1736struct nft_expr_info {
1737 const struct nft_expr_ops *ops;
ef1f7df9 1738 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1739};
1740
0ca743a5
PNA		 1741static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1742 const struct nlattr *nla,
96518518
PM		 1743 struct nft_expr_info *info)
1744{
ef1f7df9 1745 const struct nft_expr_type *type;
96518518 1746 const struct nft_expr_ops *ops;
ef1f7df9 1747 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1748 int err;
1749
fceb6435 1750 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
96518518
PM		 1751 if (err < 0)
1752 return err;
1753
64d46806 1754 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1755 if (IS_ERR(type))
1756 return PTR_ERR(type);
1757
1758 if (tb[NFTA_EXPR_DATA]) {
1759 err = nla_parse_nested(info->tb, type->maxattr,
fceb6435 1760 tb[NFTA_EXPR_DATA], type->policy, NULL);
ef1f7df9
PM		 1761 if (err < 0)
1762 goto err1;
1763 } else
1764 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1765
1766 if (type->select_ops != NULL) {
0ca743a5
PNA		 1767 ops = type->select_ops(ctx,
1768 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1769 if (IS_ERR(ops)) {
1770 err = PTR_ERR(ops);
1771 goto err1;
1772 }
1773 } else
1774 ops = type->ops;
1775
96518518
PM		 1776 info->ops = ops;
1777 return 0;
ef1f7df9
PM		 1778
1779err1:
1780 module_put(type->owner);
1781 return err;
96518518
PM		 1782}
1783
1784static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1785 const struct nft_expr_info *info,
96518518
PM		 1786 struct nft_expr *expr)
1787{
1788 const struct nft_expr_ops *ops = info->ops;
1789 int err;
1790
1791 expr->ops = ops;
1792 if (ops->init) {
ef1f7df9 1793 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1794 if (err < 0)
1795 goto err1;
1796 }
1797
c56e3956
LZ		 1798 if (ops->validate) {
1799 const struct nft_data *data = NULL;
1800
1801 err = ops->validate(ctx, expr, &data);
1802 if (err < 0)
1803 goto err2;
1804 }
1805
96518518
PM		 1806 return 0;
1807
c56e3956
LZ		 1808err2:
1809 if (ops->destroy)
1810 ops->destroy(ctx, expr);
96518518
PM		 1811err1:
1812 expr->ops = NULL;
1813 return err;
1814}
1815
62472bce
PM		 1816static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1817 struct nft_expr *expr)
96518518
PM		 1818{
1819 if (expr->ops->destroy)
62472bce 1820 expr->ops->destroy(ctx, expr);
ef1f7df9 1821 module_put(expr->ops->type->owner);
96518518
PM		 1822}
1823
0b2d8a7b
PM		 1824struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1825 const struct nlattr *nla)
1826{
1827 struct nft_expr_info info;
1828 struct nft_expr *expr;
1829 int err;
1830
1831 err = nf_tables_expr_parse(ctx, nla, &info);
1832 if (err < 0)
1833 goto err1;
1834
1835 err = -ENOMEM;
1836 expr = kzalloc(info.ops->size, GFP_KERNEL);
1837 if (expr == NULL)
1838 goto err2;
1839
1840 err = nf_tables_newexpr(ctx, &info, expr);
1841 if (err < 0)
6cafaf47 1842 goto err3;
0b2d8a7b
PM		 1843
1844 return expr;
6cafaf47
LZ		 1845err3:
1846 kfree(expr);
0b2d8a7b
PM		 1847err2:
1848 module_put(info.ops->type->owner);
1849err1:
1850 return ERR_PTR(err);
1851}
1852
1853void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1854{
1855 nf_tables_expr_destroy(ctx, expr);
1856 kfree(expr);
1857}
1858
96518518
PM		 1859/*
1860 * Rules
1861 */
1862
1863static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1864 u64 handle)
1865{
1866 struct nft_rule *rule;
1867
1868 // FIXME: this sucks
1869 list_for_each_entry(rule, &chain->rules, list) {
1870 if (handle == rule->handle)
1871 return rule;
1872 }
1873
1874 return ERR_PTR(-ENOENT);
1875}
1876
1877static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1878 const struct nlattr *nla)
1879{
1880 if (nla == NULL)
1881 return ERR_PTR(-EINVAL);
1882
1883 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1884}
1885
1886static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 1887 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1888 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1889 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1890 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1891 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1892 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1893 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1894 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1895 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1896 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1897};
1898
84d7fce6
PNA		 1899static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1900 u32 portid, u32 seq, int event,
1901 u32 flags, int family,
96518518
PM		 1902 const struct nft_table *table,
1903 const struct nft_chain *chain,
1904 const struct nft_rule *rule)
1905{
1906 struct nlmsghdr *nlh;
1907 struct nfgenmsg *nfmsg;
1908 const struct nft_expr *expr, *next;
1909 struct nlattr *list;
5e948466 1910 const struct nft_rule *prule;
dedb67c4 1911 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 1912
dedb67c4 1913 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 1914 if (nlh == NULL)
1915 goto nla_put_failure;
1916
1917 nfmsg = nlmsg_data(nlh);
1918 nfmsg->nfgen_family = family;
1919 nfmsg->version = NFNETLINK_V0;
84d7fce6 1920 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1921
1922 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1923 goto nla_put_failure;
1924 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1925 goto nla_put_failure;
b46f6ded
ND		 1926 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1927 NFTA_RULE_PAD))
96518518
PM		 1928 goto nla_put_failure;
1929
5e948466 1930 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 1931 prule = list_prev_entry(rule, list);
5e948466 1932 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1933 cpu_to_be64(prule->handle),
1934 NFTA_RULE_PAD))
5e948466
EL		 1935 goto nla_put_failure;
1936 }
1937
96518518
PM		 1938 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1939 if (list == NULL)
1940 goto nla_put_failure;
1941 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1942 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1943 goto nla_put_failure;
96518518
PM		 1944 }
1945 nla_nest_end(skb, list);
1946
86f1ec32
PM		 1947 if (rule->udata) {
1948 struct nft_userdata *udata = nft_userdata(rule);
1949 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1950 udata->data) < 0)
1951 goto nla_put_failure;
1952 }
0768b3b3 1953
053c095a
JB		 1954 nlmsg_end(skb, nlh);
1955 return 0;
96518518
PM		 1956
1957nla_put_failure:
1958 nlmsg_trim(skb, nlh);
1959 return -1;
1960}
1961
25e94a99
PNA		 1962static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1963 const struct nft_rule *rule, int event)
96518518
PM		 1964{
1965 struct sk_buff *skb;
96518518
PM		 1966 int err;
1967
128ad332
PNA		 1968 if (!ctx->report &&
1969 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1970 return;
96518518 1971
96518518
PM		 1972 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1973 if (skb == NULL)
1974 goto err;
1975
84d7fce6
PNA		 1976 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1977 event, 0, ctx->afi->family, ctx->table,
35151d84 1978 ctx->chain, rule);
96518518
PM		 1979 if (err < 0) {
1980 kfree_skb(skb);
1981 goto err;
1982 }
1983
25e94a99
PNA		 1984 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1985 ctx->report, GFP_KERNEL);
1986 return;
96518518 1987err:
25e94a99 1988 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1989}
1990
6e1f760e 1991struct nft_rule_dump_ctx {
e46abbcc 1992 char *table;
b7263e07 1993 char *chain;
6e1f760e
PNA		 1994};
1995
96518518
PM		 1996static int nf_tables_dump_rules(struct sk_buff *skb,
1997 struct netlink_callback *cb)
1998{
1999 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2000 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 2001 const struct nft_af_info *afi;
2002 const struct nft_table *table;
2003 const struct nft_chain *chain;
2004 const struct nft_rule *rule;
2005 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 2006 struct net *net = sock_net(skb->sk);
96518518
PM		 2007 int family = nfmsg->nfgen_family;
2008
e688a7f8 2009 rcu_read_lock();
38e029f1
PNA		 2010 cb->seq = net->nft.base_seq;
2011
e688a7f8 2012 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 2013 if (family != NFPROTO_UNSPEC && family != afi->family)
2014 continue;
2015
e688a7f8 2016 list_for_each_entry_rcu(table, &afi->tables, list) {
e46abbcc 2017 if (ctx && ctx->table &&
6e1f760e
PNA		 2018 strcmp(ctx->table, table->name) != 0)
2019 continue;
2020
e688a7f8 2021 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 2022 if (ctx && ctx->chain[0] &&
2023 strcmp(ctx->chain, chain->name) != 0)
2024 continue;
2025
e688a7f8 2026 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2027 if (!nft_is_active(net, rule))
0628b123 2028 goto cont;
96518518
PM		 2029 if (idx < s_idx)
2030 goto cont;
2031 if (idx > s_idx)
2032 memset(&cb->args[1], 0,
2033 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2034 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2035 cb->nlh->nlmsg_seq,
2036 NFT_MSG_NEWRULE,
2037 NLM_F_MULTI | NLM_F_APPEND,
2038 afi->family, table, chain, rule) < 0)
2039 goto done;
38e029f1
PNA		 2040
2041 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2042cont:
2043 idx++;
2044 }
2045 }
2046 }
2047 }
2048done:
e688a7f8
PNA		 2049 rcu_read_unlock();
2050
96518518
PM		 2051 cb->args[0] = idx;
2052 return skb->len;
2053}
2054
6e1f760e
PNA		 2055static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2056{
e46abbcc
PS		 2057 struct nft_rule_dump_ctx *ctx = cb->data;
2058
2059 if (ctx) {
2060 kfree(ctx->table);
b7263e07 2061 kfree(ctx->chain);
e46abbcc
PS		 2062 kfree(ctx);
2063 }
6e1f760e
PNA		 2064 return 0;
2065}
2066
7b8002a1
PNA		 2067static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2068 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2069 const struct nlattr * const nla[],
2070 struct netlink_ext_ack *extack)
96518518
PM		 2071{
2072 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2073 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2074 const struct nft_af_info *afi;
2075 const struct nft_table *table;
2076 const struct nft_chain *chain;
2077 const struct nft_rule *rule;
2078 struct sk_buff *skb2;
2079 int family = nfmsg->nfgen_family;
2080 int err;
2081
2082 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2083 struct netlink_dump_control c = {
2084 .dump = nf_tables_dump_rules,
6e1f760e 2085 .done = nf_tables_dump_rules_done,
96518518 2086 };
6e1f760e
PNA		 2087
2088 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2089 struct nft_rule_dump_ctx *ctx;
2090
2091 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2092 if (!ctx)
2093 return -ENOMEM;
2094
e46abbcc
PS		 2095 if (nla[NFTA_RULE_TABLE]) {
2096 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2097 GFP_KERNEL);
2098 if (!ctx->table) {
2099 kfree(ctx);
2100 return -ENOMEM;
2101 }
2102 }
b7263e07
PS		 2103 if (nla[NFTA_RULE_CHAIN]) {
2104 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2105 GFP_KERNEL);
2106 if (!ctx->chain) {
2107 kfree(ctx->table);
2108 kfree(ctx);
2109 return -ENOMEM;
2110 }
2111 }
6e1f760e
PNA		 2112 c.data = ctx;
2113 }
2114
96518518
PM		 2115 return netlink_dump_start(nlsk, skb, nlh, &c);
2116 }
2117
99633ab2 2118 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2119 if (IS_ERR(afi))
2120 return PTR_ERR(afi);
2121
f2a6d766 2122 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2123 if (IS_ERR(table))
2124 return PTR_ERR(table);
2125
664b0f8c 2126 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2127 if (IS_ERR(chain))
2128 return PTR_ERR(chain);
2129
2130 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2131 if (IS_ERR(rule))
2132 return PTR_ERR(rule);
2133
2134 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2135 if (!skb2)
2136 return -ENOMEM;
2137
84d7fce6 2138 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2139 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2140 family, table, chain, rule);
2141 if (err < 0)
2142 goto err;
2143
2144 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2145
2146err:
2147 kfree_skb(skb2);
2148 return err;
2149}
2150
62472bce
PM		 2151static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2152 struct nft_rule *rule)
96518518 2153{
96518518
PM		 2154 struct nft_expr *expr;
2155
2156 /*
2157 * Careful: some expressions might not be initialized in case this
2158 * is called on error from nf_tables_newrule().
2159 */
2160 expr = nft_expr_first(rule);
3e38df13 2161 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2162 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2163 expr = nft_expr_next(expr);
2164 }
2165 kfree(rule);
2166}
2167
1081d11b
PNA		 2168#define NFT_RULE_MAXEXPRS 128
2169
2170static struct nft_expr_info *info;
2171
633c9a84
PNA		 2172static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2173 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2174 const struct nlattr * const nla[],
2175 struct netlink_ext_ack *extack)
96518518
PM		 2176{
2177 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2178 u8 genmask = nft_genmask_next(net);
7c95f6d8 2179 struct nft_af_info *afi;
96518518
PM		 2180 struct nft_table *table;
2181 struct nft_chain *chain;
2182 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2183 struct nft_userdata *udata;
1081d11b 2184 struct nft_trans *trans = NULL;
96518518
PM		 2185 struct nft_expr *expr;
2186 struct nft_ctx ctx;
2187 struct nlattr *tmp;
86f1ec32 2188 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2189 int err, rem;
2190 bool create;
5e948466 2191 u64 handle, pos_handle;
96518518
PM		 2192
2193 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2194
99633ab2 2195 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2196 if (IS_ERR(afi))
2197 return PTR_ERR(afi);
2198
f2a6d766 2199 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2200 if (IS_ERR(table))
2201 return PTR_ERR(table);
2202
664b0f8c 2203 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2204 if (IS_ERR(chain))
2205 return PTR_ERR(chain);
2206
2207 if (nla[NFTA_RULE_HANDLE]) {
2208 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2209 rule = __nf_tables_rule_lookup(chain, handle);
2210 if (IS_ERR(rule))
2211 return PTR_ERR(rule);
2212
2213 if (nlh->nlmsg_flags & NLM_F_EXCL)
2214 return -EEXIST;
2215 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2216 old_rule = rule;
2217 else
2218 return -EOPNOTSUPP;
2219 } else {
2220 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2221 return -EINVAL;
2222 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2223
2224 if (chain->use == UINT_MAX)
2225 return -EOVERFLOW;
96518518
PM		 2226 }
2227
5e948466
EL		 2228 if (nla[NFTA_RULE_POSITION]) {
2229 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2230 return -EOPNOTSUPP;
2231
2232 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2233 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2234 if (IS_ERR(old_rule))
2235 return PTR_ERR(old_rule);
2236 }
2237
633c9a84 2238 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2239
96518518
PM		 2240 n = 0;
2241 size = 0;
2242 if (nla[NFTA_RULE_EXPRESSIONS]) {
2243 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2244 err = -EINVAL;
2245 if (nla_type(tmp) != NFTA_LIST_ELEM)
2246 goto err1;
2247 if (n == NFT_RULE_MAXEXPRS)
2248 goto err1;
0ca743a5 2249 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2250 if (err < 0)
2251 goto err1;
2252 size += info[n].ops->size;
2253 n++;
2254 }
2255 }
9889840f
PM		 2256 /* Check for overflow of dlen field */
2257 err = -EFBIG;
2258 if (size >= 1 << 12)
2259 goto err1;
96518518 2260
86f1ec32 2261 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2262 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2263 if (ulen > 0)
2264 usize = sizeof(struct nft_userdata) + ulen;
2265 }
0768b3b3 2266
96518518 2267 err = -ENOMEM;
86f1ec32 2268 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2269 if (rule == NULL)
2270 goto err1;
2271
889f7ee7 2272 nft_activate_next(net, rule);
0628b123 2273
96518518
PM		 2274 rule->handle = handle;
2275 rule->dlen = size;
86f1ec32 2276 rule->udata = ulen ? 1 : 0;
0768b3b3 2277
86f1ec32
PM		 2278 if (ulen) {
2279 udata = nft_userdata(rule);
2280 udata->len = ulen - 1;
2281 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2282 }
96518518 2283
96518518
PM		 2284 expr = nft_expr_first(rule);
2285 for (i = 0; i < n; i++) {
2286 err = nf_tables_newexpr(&ctx, &info[i], expr);
2287 if (err < 0)
2288 goto err2;
ef1f7df9 2289 info[i].ops = NULL;
96518518
PM		 2290 expr = nft_expr_next(expr);
2291 }
2292
96518518 2293 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2294 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2295 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2296 old_rule);
1081d11b 2297 if (trans == NULL) {
0628b123
PNA		 2298 err = -ENOMEM;
2299 goto err2;
2300 }
889f7ee7 2301 nft_deactivate_next(net, old_rule);
ac34b861 2302 chain->use--;
5bc5c307 2303 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2304 } else {
2305 err = -ENOENT;
2306 goto err2;
2307 }
96518518 2308 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2309 if (old_rule)
2310 list_add_rcu(&rule->list, &old_rule->list);
2311 else
2312 list_add_tail_rcu(&rule->list, &chain->rules);
2313 else {
2314 if (old_rule)
2315 list_add_tail_rcu(&rule->list, &old_rule->list);
2316 else
2317 list_add_rcu(&rule->list, &chain->rules);
2318 }
96518518 2319
b380e5c7 2320 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2321 err = -ENOMEM;
2322 goto err3;
2323 }
4fefee57 2324 chain->use++;
96518518
PM		 2325 return 0;
2326
0628b123
PNA		 2327err3:
2328 list_del_rcu(&rule->list);
96518518 2329err2:
62472bce 2330 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2331err1:
2332 for (i = 0; i < n; i++) {
2333 if (info[i].ops != NULL)
ef1f7df9 2334 module_put(info[i].ops->type->owner);
96518518
PM		 2335 }
2336 return err;
2337}
2338
1a94e38d
PNA		 2339static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2340 const struct nlattr *nla)
2341{
2342 u32 id = ntohl(nla_get_be32(nla));
2343 struct nft_trans *trans;
2344
2345 list_for_each_entry(trans, &net->nft.commit_list, list) {
2346 struct nft_rule *rule = nft_trans_rule(trans);
2347
2348 if (trans->msg_type == NFT_MSG_NEWRULE &&
2349 id == nft_trans_rule_id(trans))
2350 return rule;
2351 }
2352 return ERR_PTR(-ENOENT);
2353}
2354
633c9a84
PNA		 2355static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2356 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2357 const struct nlattr * const nla[],
2358 struct netlink_ext_ack *extack)
96518518
PM		 2359{
2360 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2361 u8 genmask = nft_genmask_next(net);
7c95f6d8 2362 struct nft_af_info *afi;
7c95f6d8 2363 struct nft_table *table;
cf9dc09d
PNA		 2364 struct nft_chain *chain = NULL;
2365 struct nft_rule *rule;
0628b123
PNA		 2366 int family = nfmsg->nfgen_family, err = 0;
2367 struct nft_ctx ctx;
96518518 2368
99633ab2 2369 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2370 if (IS_ERR(afi))
2371 return PTR_ERR(afi);
2372
f2a6d766 2373 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2374 if (IS_ERR(table))
2375 return PTR_ERR(table);
2376
cf9dc09d 2377 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2378 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2379 genmask);
cf9dc09d
PNA		 2380 if (IS_ERR(chain))
2381 return PTR_ERR(chain);
2382 }
96518518 2383
633c9a84 2384 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2385
cf9dc09d
PNA		 2386 if (chain) {
2387 if (nla[NFTA_RULE_HANDLE]) {
2388 rule = nf_tables_rule_lookup(chain,
2389 nla[NFTA_RULE_HANDLE]);
2390 if (IS_ERR(rule))
2391 return PTR_ERR(rule);
96518518 2392
1a94e38d
PNA		 2393 err = nft_delrule(&ctx, rule);
2394 } else if (nla[NFTA_RULE_ID]) {
2395 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2396 if (IS_ERR(rule))
2397 return PTR_ERR(rule);
2398
5e266fe7 2399 err = nft_delrule(&ctx, rule);
cf9dc09d 2400 } else {
ce24b721 2401 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2402 }
2403 } else {
2404 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2405 if (!nft_is_active_next(net, chain))
2406 continue;
2407
cf9dc09d 2408 ctx.chain = chain;
ce24b721 2409 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2410 if (err < 0)
2411 break;
2412 }
2413 }
2414
2415 return err;
2416}
2417
20a69341
PM		 2418/*
2419 * Sets
2420 */
2421
2b664957 2422static LIST_HEAD(nf_tables_set_types);
20a69341 2423
2b664957 2424int nft_register_set(struct nft_set_type *type)
20a69341
PM		 2425{
2426 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2427 list_add_tail_rcu(&type->list, &nf_tables_set_types);
20a69341
PM		 2428 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2429 return 0;
2430}
2431EXPORT_SYMBOL_GPL(nft_register_set);
2432
2b664957 2433void nft_unregister_set(struct nft_set_type *type)
20a69341
PM		 2434{
2435 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2436 list_del_rcu(&type->list);
20a69341
PM		 2437 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2438}
2439EXPORT_SYMBOL_GPL(nft_unregister_set);
2440
2b664957
PNA		 2441#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2442 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2443
2444static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2445{
2446 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2447}
2448
c50b960c
PM		 2449/*
2450 * Select a set implementation based on the data characteristics and the
2451 * given policy. The total memory use might not be known if no size is
2452 * given, in that case the amount of memory per element is used.
2453 */
2454static const struct nft_set_ops *
2b664957
PNA		 2455nft_select_set_ops(const struct nft_ctx *ctx,
2456 const struct nlattr * const nla[],
c50b960c
PM		 2457 const struct nft_set_desc *desc,
2458 enum nft_set_policies policy)
20a69341 2459{
c50b960c
PM		 2460 const struct nft_set_ops *ops, *bops;
2461 struct nft_set_estimate est, best;
2b664957
PNA		 2462 const struct nft_set_type *type;
2463 u32 flags = 0;
20a69341
PM		 2464
2465#ifdef CONFIG_MODULES
2b664957 2466 if (list_empty(&nf_tables_set_types)) {
20a69341
PM		 2467 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2468 request_module("nft-set");
2469 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2470 if (!list_empty(&nf_tables_set_types))
20a69341
PM		 2471 return ERR_PTR(-EAGAIN);
2472 }
2473#endif
2b664957
PNA		 2474 if (nla[NFTA_SET_FLAGS] != NULL)
2475 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 2476
55af753c
PNA		 2477 bops = NULL;
2478 best.size = ~0;
2479 best.lookup = ~0;
0b5a7874 2480 best.space = ~0;
c50b960c 2481
2b664957
PNA		 2482 list_for_each_entry(type, &nf_tables_set_types, list) {
2483 if (!type->select_ops)
2484 ops = type->ops;
2485 else
2486 ops = type->select_ops(ctx, desc, flags);
2487 if (!ops)
2488 continue;
2489
2490 if (!nft_set_ops_candidate(ops, flags))
20a69341 2491 continue;
2b664957 2492 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 2493 continue;
2494
2495 switch (policy) {
2496 case NFT_SET_POL_PERFORMANCE:
55af753c 2497 if (est.lookup < best.lookup)
c50b960c 2498 break;
0b5a7874
PNA		 2499 if (est.lookup == best.lookup) {
2500 if (!desc->size) {
2501 if (est.space < best.space)
2502 break;
2503 } else if (est.size < best.size) {
2504 break;
2505 }
2506 }
c50b960c
PM		 2507 continue;
2508 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2509 if (!desc->size) {
2510 if (est.space < best.space)
2511 break;
2512 if (est.space == best.space &&
2513 est.lookup < best.lookup)
2514 break;
2515 } else if (est.size < best.size) {
c50b960c 2516 break;
0b5a7874 2517 }
c50b960c
PM		 2518 continue;
2519 default:
2520 break;
2521 }
2522
2b664957 2523 if (!try_module_get(type->owner))
20a69341 2524 continue;
c50b960c 2525 if (bops != NULL)
2b664957 2526 module_put(bops->type->owner);
c50b960c
PM		 2527
2528 bops = ops;
2529 best = est;
20a69341
PM		 2530 }
2531
c50b960c
PM		 2532 if (bops != NULL)
2533 return bops;
2534
20a69341
PM		 2535 return ERR_PTR(-EOPNOTSUPP);
2536}
2537
2538static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2539 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2540 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2541 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2542 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2543 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2544 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2545 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2546 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2547 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2548 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2549 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2550 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2551 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2552 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2553 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2554 .len = NFT_USERDATA_MAXLEN },
8aeff920 2555 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2556};
2557
2558static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2559 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2560};
2561
633c9a84 2562static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2563 const struct sk_buff *skb,
2564 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2565 const struct nlattr * const nla[],
2566 u8 genmask)
20a69341
PM		 2567{
2568 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2569 struct nft_af_info *afi = NULL;
2570 struct nft_table *table = NULL;
20a69341 2571
c9c8e485
PNA		 2572 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2573 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2574 if (IS_ERR(afi))
2575 return PTR_ERR(afi);
2576 }
20a69341
PM		 2577
2578 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2579 if (afi == NULL)
2580 return -EAFNOSUPPORT;
2581
f2a6d766
PNA		 2582 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2583 genmask);
20a69341
PM		 2584 if (IS_ERR(table))
2585 return PTR_ERR(table);
2586 }
2587
633c9a84 2588 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2589 return 0;
2590}
2591
c7a72e3f
PNA		 2592static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2593 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2594{
2595 struct nft_set *set;
2596
2597 if (nla == NULL)
2598 return ERR_PTR(-EINVAL);
2599
2600 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2601 if (!nla_strcmp(nla, set->name) &&
2602 nft_active_genmask(set, genmask))
20a69341
PM		 2603 return set;
2604 }
2605 return ERR_PTR(-ENOENT);
2606}
2607
c7a72e3f
PNA		 2608static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2609 const struct nlattr *nla,
2610 u8 genmask)
958bee14
PNA		 2611{
2612 struct nft_trans *trans;
2613 u32 id = ntohl(nla_get_be32(nla));
2614
2615 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2616 struct nft_set *set = nft_trans_set(trans);
2617
958bee14 2618 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2619 id == nft_trans_set_id(trans) &&
2620 nft_active_genmask(set, genmask))
2621 return set;
958bee14
PNA		 2622 }
2623 return ERR_PTR(-ENOENT);
2624}
c7a72e3f
PNA		 2625
2626struct nft_set *nft_set_lookup(const struct net *net,
2627 const struct nft_table *table,
2628 const struct nlattr *nla_set_name,
2629 const struct nlattr *nla_set_id,
2630 u8 genmask)
2631{
2632 struct nft_set *set;
2633
2634 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2635 if (IS_ERR(set)) {
2636 if (!nla_set_id)
2637 return set;
2638
2639 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2640 }
2641 return set;
2642}
2643EXPORT_SYMBOL_GPL(nft_set_lookup);
958bee14 2644
20a69341
PM		 2645static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2646 const char *name)
2647{
2648 const struct nft_set *i;
2649 const char *p;
2650 unsigned long *inuse;
60eb1894 2651 unsigned int n = 0, min = 0;
20a69341 2652
38745490 2653 p = strchr(name, '%');
20a69341
PM		 2654 if (p != NULL) {
2655 if (p[1] != 'd' || strchr(p + 2, '%'))
2656 return -EINVAL;
2657
2658 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2659 if (inuse == NULL)
2660 return -ENOMEM;
60eb1894 2661cont:
20a69341 2662 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2663 int tmp;
2664
37a9cc52
PNA		 2665 if (!nft_is_active_next(ctx->net, set))
2666 continue;
14662917 2667 if (!sscanf(i->name, name, &tmp))
20a69341 2668 continue;
60eb1894 2669 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2670 continue;
14662917 2671
60eb1894 2672 set_bit(tmp - min, inuse);
20a69341
PM		 2673 }
2674
53b70287 2675 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2676 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2677 min += BITS_PER_BYTE * PAGE_SIZE;
2678 memset(inuse, 0, PAGE_SIZE);
2679 goto cont;
2680 }
20a69341
PM		 2681 free_page((unsigned long)inuse);
2682 }
2683
38745490
PS		 2684 set->name = kasprintf(GFP_KERNEL, name, min + n);
2685 if (!set->name)
2686 return -ENOMEM;
2687
20a69341 2688 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2689 if (!nft_is_active_next(ctx->net, i))
2690 continue;
20a69341
PM		 2691 if (!strcmp(set->name, i->name))
2692 return -ENFILE;
2693 }
2694 return 0;
2695}
2696
2697static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2698 const struct nft_set *set, u16 event, u16 flags)
2699{
2700 struct nfgenmsg *nfmsg;
2701 struct nlmsghdr *nlh;
c50b960c 2702 struct nlattr *desc;
128ad332
PNA		 2703 u32 portid = ctx->portid;
2704 u32 seq = ctx->seq;
20a69341 2705
dedb67c4 2706 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 2707 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2708 flags);
2709 if (nlh == NULL)
2710 goto nla_put_failure;
2711
2712 nfmsg = nlmsg_data(nlh);
2713 nfmsg->nfgen_family = ctx->afi->family;
2714 nfmsg->version = NFNETLINK_V0;
84d7fce6 2715 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2716
2717 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2718 goto nla_put_failure;
2719 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2720 goto nla_put_failure;
2721 if (set->flags != 0)
2722 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2723 goto nla_put_failure;
2724
2725 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2726 goto nla_put_failure;
2727 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2728 goto nla_put_failure;
2729 if (set->flags & NFT_SET_MAP) {
2730 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2731 goto nla_put_failure;
2732 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2733 goto nla_put_failure;
2734 }
8aeff920
PNA		 2735 if (set->flags & NFT_SET_OBJECT &&
2736 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2737 goto nla_put_failure;
20a69341 2738
761da293 2739 if (set->timeout &&
d3e2a111
AP		 2740 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2741 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2742 NFTA_SET_PAD))
761da293
PM		 2743 goto nla_put_failure;
2744 if (set->gc_int &&
2745 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2746 goto nla_put_failure;
2747
9363dc4b
AB		 2748 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2749 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2750 goto nla_put_failure;
2751 }
2752
e6d8ecac
CFG		 2753 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2754 goto nla_put_failure;
2755
c50b960c
PM		 2756 desc = nla_nest_start(skb, NFTA_SET_DESC);
2757 if (desc == NULL)
2758 goto nla_put_failure;
2759 if (set->size &&
2760 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2761 goto nla_put_failure;
2762 nla_nest_end(skb, desc);
2763
053c095a
JB		 2764 nlmsg_end(skb, nlh);
2765 return 0;
20a69341
PM		 2766
2767nla_put_failure:
2768 nlmsg_trim(skb, nlh);
2769 return -1;
2770}
2771
25e94a99
PNA		 2772static void nf_tables_set_notify(const struct nft_ctx *ctx,
2773 const struct nft_set *set, int event,
2774 gfp_t gfp_flags)
20a69341
PM		 2775{
2776 struct sk_buff *skb;
128ad332 2777 u32 portid = ctx->portid;
20a69341
PM		 2778 int err;
2779
128ad332
PNA		 2780 if (!ctx->report &&
2781 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2782 return;
20a69341 2783
31f8441c 2784 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2785 if (skb == NULL)
2786 goto err;
2787
2788 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2789 if (err < 0) {
2790 kfree_skb(skb);
2791 goto err;
2792 }
2793
25e94a99
PNA		 2794 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2795 gfp_flags);
2796 return;
20a69341 2797err:
25e94a99 2798 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 2799}
2800
5b96af77 2801static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2802{
2803 const struct nft_set *set;
2804 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2805 struct nft_af_info *afi;
c9c8e485
PNA		 2806 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2807 struct net *net = sock_net(skb->sk);
2808 int cur_family = cb->args[3];
5b96af77 2809 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2810
2811 if (cb->args[1])
2812 return skb->len;
2813
e688a7f8 2814 rcu_read_lock();
38e029f1
PNA		 2815 cb->seq = net->nft.base_seq;
2816
e688a7f8 2817 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2818 if (ctx->afi && ctx->afi != afi)
2819 continue;
2820
c9c8e485
PNA		 2821 if (cur_family) {
2822 if (afi->family != cur_family)
2823 continue;
2824
2825 cur_family = 0;
2826 }
e688a7f8 2827 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2828 if (ctx->table && ctx->table != table)
2829 continue;
2830
c9c8e485
PNA		 2831 if (cur_table) {
2832 if (cur_table != table)
2833 continue;
2834
2835 cur_table = NULL;
2836 }
c9c8e485 2837 idx = 0;
5b96af77 2838 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2839 if (idx < s_idx)
2840 goto cont;
37a9cc52
PNA		 2841 if (!nft_is_active(net, set))
2842 goto cont;
5b96af77
PNA		 2843
2844 ctx_set = *ctx;
2845 ctx_set.table = table;
2846 ctx_set.afi = afi;
2847 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2848 NFT_MSG_NEWSET,
2849 NLM_F_MULTI) < 0) {
2850 cb->args[0] = idx;
2851 cb->args[2] = (unsigned long) table;
2852 cb->args[3] = afi->family;
2853 goto done;
2854 }
38e029f1 2855 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2856cont:
2857 idx++;
2858 }
2859 if (s_idx)
2860 s_idx = 0;
2861 }
2862 }
2863 cb->args[1] = 1;
2864done:
e688a7f8 2865 rcu_read_unlock();
c9c8e485
PNA		 2866 return skb->len;
2867}
2868
5b96af77 2869static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2870{
5b96af77
PNA		 2871 kfree(cb->data);
2872 return 0;
20a69341
PM		 2873}
2874
7b8002a1
PNA		 2875static int nf_tables_getset(struct net *net, struct sock *nlsk,
2876 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2877 const struct nlattr * const nla[],
2878 struct netlink_ext_ack *extack)
20a69341 2879{
f2a6d766 2880 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2881 const struct nft_set *set;
2882 struct nft_ctx ctx;
2883 struct sk_buff *skb2;
c9c8e485 2884 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2885 int err;
2886
01cfa0a4 2887 /* Verify existence before starting dump */
f2a6d766 2888 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2889 if (err < 0)
2890 return err;
2891
2892 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2893 struct netlink_dump_control c = {
2894 .dump = nf_tables_dump_sets,
5b96af77 2895 .done = nf_tables_dump_sets_done,
20a69341 2896 };
5b96af77
PNA		 2897 struct nft_ctx *ctx_dump;
2898
2899 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2900 if (ctx_dump == NULL)
2901 return -ENOMEM;
2902
2903 *ctx_dump = ctx;
2904 c.data = ctx_dump;
2905
20a69341
PM		 2906 return netlink_dump_start(nlsk, skb, nlh, &c);
2907 }
2908
c9c8e485
PNA		 2909 /* Only accept unspec with dump */
2910 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2911 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2912 if (!nla[NFTA_SET_TABLE])
2913 return -EINVAL;
c9c8e485 2914
37a9cc52 2915 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2916 if (IS_ERR(set))
2917 return PTR_ERR(set);
2918
2919 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2920 if (skb2 == NULL)
2921 return -ENOMEM;
2922
2923 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2924 if (err < 0)
2925 goto err;
2926
2927 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2928
2929err:
2930 kfree_skb(skb2);
2931 return err;
2932}
2933
c50b960c
PM		 2934static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2935 struct nft_set_desc *desc,
2936 const struct nlattr *nla)
2937{
2938 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2939 int err;
2940
fceb6435
JB		 2941 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2942 nft_set_desc_policy, NULL);
c50b960c
PM		 2943 if (err < 0)
2944 return err;
2945
2946 if (da[NFTA_SET_DESC_SIZE] != NULL)
2947 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2948
2949 return 0;
2950}
2951
633c9a84
PNA		 2952static int nf_tables_newset(struct net *net, struct sock *nlsk,
2953 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2954 const struct nlattr * const nla[],
2955 struct netlink_ext_ack *extack)
20a69341
PM		 2956{
2957 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2958 u8 genmask = nft_genmask_next(net);
20a69341 2959 const struct nft_set_ops *ops;
7c95f6d8 2960 struct nft_af_info *afi;
20a69341
PM		 2961 struct nft_table *table;
2962 struct nft_set *set;
2963 struct nft_ctx ctx;
38745490 2964 char *name;
20a69341
PM		 2965 unsigned int size;
2966 bool create;
761da293 2967 u64 timeout;
8aeff920 2968 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 2969 struct nft_set_desc desc;
e6d8ecac
CFG		 2970 unsigned char *udata;
2971 u16 udlen;
20a69341
PM		 2972 int err;
2973
2974 if (nla[NFTA_SET_TABLE] == NULL ||
2975 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2976 nla[NFTA_SET_KEY_LEN] == NULL ||
2977 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2978 return -EINVAL;
2979
c50b960c
PM		 2980 memset(&desc, 0, sizeof(desc));
2981
20a69341
PM		 2982 ktype = NFT_DATA_VALUE;
2983 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2984 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2985 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2986 return -EINVAL;
2987 }
2988
c50b960c 2989 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 2990 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 2991 return -EINVAL;
2992
2993 flags = 0;
2994 if (nla[NFTA_SET_FLAGS] != NULL) {
2995 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2996 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 2997 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 2998 NFT_SET_MAP | NFT_SET_EVAL |
2999 NFT_SET_OBJECT))
20a69341 3000 return -EINVAL;
8aeff920
PNA		 3001 /* Only one of these operations is supported */
3002 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3003 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3004 return -EOPNOTSUPP;
20a69341
PM		 3005 }
3006
3007 dtype = 0;
20a69341
PM		 3008 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3009 if (!(flags & NFT_SET_MAP))
3010 return -EINVAL;
3011
3012 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3013 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3014 dtype != NFT_DATA_VERDICT)
3015 return -EINVAL;
3016
3017 if (dtype != NFT_DATA_VERDICT) {
3018 if (nla[NFTA_SET_DATA_LEN] == NULL)
3019 return -EINVAL;
c50b960c 3020 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 3021 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3022 return -EINVAL;
3023 } else
7d740264 3024 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 3025 } else if (flags & NFT_SET_MAP)
3026 return -EINVAL;
3027
8aeff920
PNA		 3028 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3029 if (!(flags & NFT_SET_OBJECT))
3030 return -EINVAL;
3031
3032 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3033 if (objtype == NFT_OBJECT_UNSPEC ||
3034 objtype > NFT_OBJECT_MAX)
3035 return -EINVAL;
3036 } else if (flags & NFT_SET_OBJECT)
3037 return -EINVAL;
3038 else
3039 objtype = NFT_OBJECT_UNSPEC;
3040
761da293
PM		 3041 timeout = 0;
3042 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3043 if (!(flags & NFT_SET_TIMEOUT))
3044 return -EINVAL;
d3e2a111
AP		 3045 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3046 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 3047 }
3048 gc_int = 0;
3049 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3050 if (!(flags & NFT_SET_TIMEOUT))
3051 return -EINVAL;
3052 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3053 }
3054
c50b960c
PM		 3055 policy = NFT_SET_POL_PERFORMANCE;
3056 if (nla[NFTA_SET_POLICY] != NULL)
3057 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3058
3059 if (nla[NFTA_SET_DESC] != NULL) {
3060 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3061 if (err < 0)
3062 return err;
3063 }
3064
20a69341
PM		 3065 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3066
99633ab2 3067 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 3068 if (IS_ERR(afi))
3069 return PTR_ERR(afi);
3070
f2a6d766 3071 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 3072 if (IS_ERR(table))
3073 return PTR_ERR(table);
3074
633c9a84 3075 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3076
37a9cc52 3077 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3078 if (IS_ERR(set)) {
3079 if (PTR_ERR(set) != -ENOENT)
3080 return PTR_ERR(set);
1a28ad74 3081 } else {
20a69341
PM		 3082 if (nlh->nlmsg_flags & NLM_F_EXCL)
3083 return -EEXIST;
3084 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3085 return -EOPNOTSUPP;
3086 return 0;
3087 }
3088
3089 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3090 return -ENOENT;
3091
2b664957 3092 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 3093 if (IS_ERR(ops))
3094 return PTR_ERR(ops);
3095
e6d8ecac
CFG		 3096 udlen = 0;
3097 if (nla[NFTA_SET_USERDATA])
3098 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3099
20a69341
PM		 3100 size = 0;
3101 if (ops->privsize != NULL)
347b408d 3102 size = ops->privsize(nla, &desc);
20a69341 3103
1ff75a3e
PNA		 3104 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3105 if (!set) {
3106 err = -ENOMEM;
20a69341 3107 goto err1;
1ff75a3e 3108 }
20a69341 3109
38745490
PS		 3110 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3111 if (!name) {
3112 err = -ENOMEM;
3113 goto err2;
3114 }
3115
20a69341 3116 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 3117 kfree(name);
20a69341
PM		 3118 if (err < 0)
3119 goto err2;
3120
e6d8ecac
CFG		 3121 udata = NULL;
3122 if (udlen) {
3123 udata = set->data + size;
3124 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3125 }
3126
20a69341
PM		 3127 INIT_LIST_HEAD(&set->bindings);
3128 set->ops = ops;
3129 set->ktype = ktype;
c50b960c 3130 set->klen = desc.klen;
20a69341 3131 set->dtype = dtype;
8aeff920 3132 set->objtype = objtype;
c50b960c 3133 set->dlen = desc.dlen;
20a69341 3134 set->flags = flags;
c50b960c 3135 set->size = desc.size;
9363dc4b 3136 set->policy = policy;
e6d8ecac
CFG		 3137 set->udlen = udlen;
3138 set->udata = udata;
761da293
PM		 3139 set->timeout = timeout;
3140 set->gc_int = gc_int;
20a69341 3141
c50b960c 3142 err = ops->init(set, &desc, nla);
20a69341
PM		 3143 if (err < 0)
3144 goto err2;
3145
958bee14 3146 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3147 if (err < 0)
c17c3cdf 3148 goto err3;
20a69341 3149
e688a7f8 3150 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3151 table->use++;
20a69341
PM		 3152 return 0;
3153
c17c3cdf
LZ		 3154err3:
3155 ops->destroy(set);
20a69341 3156err2:
1ff75a3e 3157 kvfree(set);
20a69341 3158err1:
2b664957 3159 module_put(ops->type->owner);
20a69341
PM		 3160 return err;
3161}
3162
958bee14 3163static void nft_set_destroy(struct nft_set *set)
20a69341 3164{
20a69341 3165 set->ops->destroy(set);
2b664957 3166 module_put(set->ops->type->owner);
38745490 3167 kfree(set->name);
1ff75a3e 3168 kvfree(set);
20a69341
PM		 3169}
3170
958bee14
PNA		 3171static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3172{
e688a7f8 3173 list_del_rcu(&set->list);
31f8441c 3174 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3175 nft_set_destroy(set);
3176}
3177
633c9a84
PNA		 3178static int nf_tables_delset(struct net *net, struct sock *nlsk,
3179 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3180 const struct nlattr * const nla[],
3181 struct netlink_ext_ack *extack)
20a69341 3182{
c9c8e485 3183 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3184 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3185 struct nft_set *set;
3186 struct nft_ctx ctx;
3187 int err;
3188
ec2c9935
PM		 3189 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3190 return -EAFNOSUPPORT;
20a69341
PM		 3191 if (nla[NFTA_SET_TABLE] == NULL)
3192 return -EINVAL;
3193
f2a6d766 3194 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3195 if (err < 0)
3196 return err;
3197
37a9cc52 3198 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3199 if (IS_ERR(set))
3200 return PTR_ERR(set);
3201 if (!list_empty(&set->bindings))
3202 return -EBUSY;
3203
ee01d542 3204 return nft_delset(&ctx, set);
20a69341
PM		 3205}
3206
3207static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3208 struct nft_set *set,
20a69341 3209 const struct nft_set_iter *iter,
de70185d 3210 struct nft_set_elem *elem)
20a69341 3211{
fe2811eb 3212 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3213 enum nft_registers dreg;
3214
3215 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3216 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3217 set->dtype == NFT_DATA_VERDICT ?
3218 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3219 set->dlen);
20a69341
PM		 3220}
3221
3222int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3223 struct nft_set_binding *binding)
3224{
3225 struct nft_set_binding *i;
3226 struct nft_set_iter iter;
3227
3228 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3229 return -EBUSY;
3230
11113e19 3231 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3232 /* If the set is already bound to the same chain all
3233 * jumps are already validated for that chain.
3234 */
3235 list_for_each_entry(i, &set->bindings, list) {
a4684402 3236 if (i->flags & NFT_SET_MAP &&
11113e19 3237 i->chain == binding->chain)
20a69341
PM		 3238 goto bind;
3239 }
3240
8588ac09 3241 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3242 iter.skip = 0;
3243 iter.count = 0;
3244 iter.err = 0;
3245 iter.fn = nf_tables_bind_check_setelem;
3246
3247 set->ops->walk(ctx, set, &iter);
a02f4248 3248 if (iter.err < 0)
20a69341 3249 return iter.err;
20a69341
PM		 3250 }
3251bind:
3252 binding->chain = ctx->chain;
e688a7f8 3253 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3254 return 0;
3255}
63aea290 3256EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3257
3258void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3259 struct nft_set_binding *binding)
3260{
e688a7f8 3261 list_del_rcu(&binding->list);
20a69341 3262
958bee14 3263 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 3264 nft_is_active(ctx->net, set))
20a69341
PM		 3265 nf_tables_set_destroy(ctx, set);
3266}
63aea290 3267EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3268
3ac4c07a
PM		 3269const struct nft_set_ext_type nft_set_ext_types[] = {
3270 [NFT_SET_EXT_KEY] = {
7d740264 3271 .align = __alignof__(u32),
3ac4c07a
PM		 3272 },
3273 [NFT_SET_EXT_DATA] = {
7d740264 3274 .align = __alignof__(u32),
3ac4c07a 3275 },
f25ad2e9
PM		 3276 [NFT_SET_EXT_EXPR] = {
3277 .align = __alignof__(struct nft_expr),
3278 },
8aeff920
PNA		 3279 [NFT_SET_EXT_OBJREF] = {
3280 .len = sizeof(struct nft_object *),
3281 .align = __alignof__(struct nft_object *),
3282 },
3ac4c07a
PM		 3283 [NFT_SET_EXT_FLAGS] = {
3284 .len = sizeof(u8),
3285 .align = __alignof__(u8),
3286 },
c3e1b005
PM		 3287 [NFT_SET_EXT_TIMEOUT] = {
3288 .len = sizeof(u64),
3289 .align = __alignof__(u64),
3290 },
3291 [NFT_SET_EXT_EXPIRATION] = {
3292 .len = sizeof(unsigned long),
3293 .align = __alignof__(unsigned long),
3294 },
68e942e8
PM		 3295 [NFT_SET_EXT_USERDATA] = {
3296 .len = sizeof(struct nft_userdata),
3297 .align = __alignof__(struct nft_userdata),
3298 },
3ac4c07a
PM		 3299};
3300EXPORT_SYMBOL_GPL(nft_set_ext_types);
3301
20a69341
PM		 3302/*
3303 * Set elements
3304 */
3305
3306static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3307 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3308 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3309 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3310 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3311 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3312 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3313};
3314
3315static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3316 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3317 .len = NFT_TABLE_MAXNAMELEN - 1 },
3318 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3319 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3320 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3321 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3322};
3323
633c9a84 3324static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3325 const struct sk_buff *skb,
3326 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3327 const struct nlattr * const nla[],
3328 u8 genmask)
20a69341
PM		 3329{
3330 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3331 struct nft_af_info *afi;
3332 struct nft_table *table;
20a69341 3333
99633ab2 3334 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3335 if (IS_ERR(afi))
3336 return PTR_ERR(afi);
3337
f2a6d766
PNA		 3338 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3339 genmask);
20a69341
PM		 3340 if (IS_ERR(table))
3341 return PTR_ERR(table);
3342
633c9a84 3343 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3344 return 0;
3345}
3346
3347static int nf_tables_fill_setelem(struct sk_buff *skb,
3348 const struct nft_set *set,
3349 const struct nft_set_elem *elem)
3350{
fe2811eb 3351 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3352 unsigned char *b = skb_tail_pointer(skb);
3353 struct nlattr *nest;
3354
3355 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3356 if (nest == NULL)
3357 goto nla_put_failure;
3358
fe2811eb
PM		 3359 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3360 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3361 goto nla_put_failure;
3362
fe2811eb
PM		 3363 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3364 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3365 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3366 set->dlen) < 0)
3367 goto nla_put_failure;
3368
f25ad2e9
PM		 3369 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3370 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3371 goto nla_put_failure;
3372
8aeff920
PNA		 3373 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3374 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3375 (*nft_set_ext_obj(ext))->name) < 0)
3376 goto nla_put_failure;
3377
fe2811eb
PM		 3378 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3379 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3380 htonl(*nft_set_ext_flags(ext))))
3381 goto nla_put_failure;
20a69341 3382
c3e1b005
PM		 3383 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3384 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3385 cpu_to_be64(jiffies_to_msecs(
3386 *nft_set_ext_timeout(ext))),
b46f6ded 3387 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3388 goto nla_put_failure;
3389
3390 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3391 unsigned long expires, now = jiffies;
3392
3393 expires = *nft_set_ext_expiration(ext);
3394 if (time_before(now, expires))
3395 expires -= now;
3396 else
3397 expires = 0;
3398
3399 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3400 cpu_to_be64(jiffies_to_msecs(expires)),
3401 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3402 goto nla_put_failure;
3403 }
3404
68e942e8
PM		 3405 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3406 struct nft_userdata *udata;
3407
3408 udata = nft_set_ext_userdata(ext);
3409 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3410 udata->len + 1, udata->data))
3411 goto nla_put_failure;
3412 }
3413
20a69341
PM		 3414 nla_nest_end(skb, nest);
3415 return 0;
3416
3417nla_put_failure:
3418 nlmsg_trim(skb, b);
3419 return -EMSGSIZE;
3420}
3421
3422struct nft_set_dump_args {
3423 const struct netlink_callback *cb;
3424 struct nft_set_iter iter;
3425 struct sk_buff *skb;
3426};
3427
3428static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3429 struct nft_set *set,
20a69341 3430 const struct nft_set_iter *iter,
de70185d 3431 struct nft_set_elem *elem)
20a69341
PM		 3432{
3433 struct nft_set_dump_args *args;
3434
3435 args = container_of(iter, struct nft_set_dump_args, iter);
3436 return nf_tables_fill_setelem(args->skb, set, elem);
3437}
3438
fa803605
LZ		 3439struct nft_set_dump_ctx {
3440 const struct nft_set *set;
3441 struct nft_ctx ctx;
3442};
3443
20a69341
PM		 3444static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3445{
fa803605 3446 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 3447 struct net *net = sock_net(skb->sk);
fa803605
LZ		 3448 struct nft_af_info *afi;
3449 struct nft_table *table;
de70185d 3450 struct nft_set *set;
20a69341 3451 struct nft_set_dump_args args;
fa803605 3452 bool set_found = false;
20a69341
PM		 3453 struct nfgenmsg *nfmsg;
3454 struct nlmsghdr *nlh;
3455 struct nlattr *nest;
3456 u32 portid, seq;
fa803605 3457 int event;
20a69341 3458
fa803605
LZ		 3459 rcu_read_lock();
3460 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3461 if (afi != dump_ctx->ctx.afi)
3462 continue;
20a69341 3463
fa803605
LZ		 3464 list_for_each_entry_rcu(table, &afi->tables, list) {
3465 if (table != dump_ctx->ctx.table)
3466 continue;
20a69341 3467
fa803605
LZ		 3468 list_for_each_entry_rcu(set, &table->sets, list) {
3469 if (set == dump_ctx->set) {
3470 set_found = true;
3471 break;
3472 }
3473 }
3474 break;
3475 }
3476 break;
3477 }
3478
3479 if (!set_found) {
3480 rcu_read_unlock();
3481 return -ENOENT;
3482 }
20a69341 3483
dedb67c4 3484 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3485 portid = NETLINK_CB(cb->skb).portid;
3486 seq = cb->nlh->nlmsg_seq;
3487
3488 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3489 NLM_F_MULTI);
3490 if (nlh == NULL)
3491 goto nla_put_failure;
3492
3493 nfmsg = nlmsg_data(nlh);
fa803605 3494 nfmsg->nfgen_family = afi->family;
20a69341 3495 nfmsg->version = NFNETLINK_V0;
fa803605 3496 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 3497
fa803605 3498 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 3499 goto nla_put_failure;
3500 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3501 goto nla_put_failure;
3502
3503 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3504 if (nest == NULL)
3505 goto nla_put_failure;
3506
8588ac09
PNA		 3507 args.cb = cb;
3508 args.skb = skb;
fa803605 3509 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 3510 args.iter.skip = cb->args[0];
3511 args.iter.count = 0;
3512 args.iter.err = 0;
3513 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 3514 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3515 rcu_read_unlock();
20a69341
PM		 3516
3517 nla_nest_end(skb, nest);
3518 nlmsg_end(skb, nlh);
3519
3520 if (args.iter.err && args.iter.err != -EMSGSIZE)
3521 return args.iter.err;
3522 if (args.iter.count == cb->args[0])
3523 return 0;
3524
3525 cb->args[0] = args.iter.count;
3526 return skb->len;
3527
3528nla_put_failure:
fa803605 3529 rcu_read_unlock();
20a69341
PM		 3530 return -ENOSPC;
3531}
3532
fa803605
LZ		 3533static int nf_tables_dump_set_done(struct netlink_callback *cb)
3534{
3535 kfree(cb->data);
3536 return 0;
3537}
3538
7b8002a1
PNA		 3539static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3540 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3541 const struct nlattr * const nla[],
3542 struct netlink_ext_ack *extack)
20a69341 3543{
f2a6d766 3544 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3545 const struct nft_set *set;
3546 struct nft_ctx ctx;
3547 int err;
3548
f2a6d766 3549 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3550 if (err < 0)
3551 return err;
3552
37a9cc52
PNA		 3553 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3554 genmask);
20a69341
PM		 3555 if (IS_ERR(set))
3556 return PTR_ERR(set);
3557
3558 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3559 struct netlink_dump_control c = {
3560 .dump = nf_tables_dump_set,
fa803605 3561 .done = nf_tables_dump_set_done,
20a69341 3562 };
fa803605
LZ		 3563 struct nft_set_dump_ctx *dump_ctx;
3564
3565 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3566 if (!dump_ctx)
3567 return -ENOMEM;
3568
3569 dump_ctx->set = set;
3570 dump_ctx->ctx = ctx;
3571
3572 c.data = dump_ctx;
20a69341
PM		 3573 return netlink_dump_start(nlsk, skb, nlh, &c);
3574 }
3575 return -EOPNOTSUPP;
3576}
3577
d60ce62f
AB		 3578static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3579 const struct nft_ctx *ctx, u32 seq,
3580 u32 portid, int event, u16 flags,
3581 const struct nft_set *set,
3582 const struct nft_set_elem *elem)
3583{
3584 struct nfgenmsg *nfmsg;
3585 struct nlmsghdr *nlh;
3586 struct nlattr *nest;
3587 int err;
3588
dedb67c4 3589 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 3590 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3591 flags);
3592 if (nlh == NULL)
3593 goto nla_put_failure;
3594
3595 nfmsg = nlmsg_data(nlh);
3596 nfmsg->nfgen_family = ctx->afi->family;
3597 nfmsg->version = NFNETLINK_V0;
84d7fce6 3598 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3599
3600 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3601 goto nla_put_failure;
3602 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3603 goto nla_put_failure;
3604
3605 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3606 if (nest == NULL)
3607 goto nla_put_failure;
3608
3609 err = nf_tables_fill_setelem(skb, set, elem);
3610 if (err < 0)
3611 goto nla_put_failure;
3612
3613 nla_nest_end(skb, nest);
3614
053c095a
JB		 3615 nlmsg_end(skb, nlh);
3616 return 0;
d60ce62f
AB		 3617
3618nla_put_failure:
3619 nlmsg_trim(skb, nlh);
3620 return -1;
3621}
3622
25e94a99
PNA		 3623static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3624 const struct nft_set *set,
3625 const struct nft_set_elem *elem,
3626 int event, u16 flags)
d60ce62f 3627{
128ad332
PNA		 3628 struct net *net = ctx->net;
3629 u32 portid = ctx->portid;
d60ce62f
AB		 3630 struct sk_buff *skb;
3631 int err;
3632
128ad332 3633 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 3634 return;
d60ce62f 3635
d60ce62f
AB		 3636 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3637 if (skb == NULL)
3638 goto err;
3639
3640 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3641 set, elem);
3642 if (err < 0) {
3643 kfree_skb(skb);
3644 goto err;
3645 }
3646
25e94a99
PNA		 3647 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3648 GFP_KERNEL);
3649 return;
d60ce62f 3650err:
25e94a99 3651 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 3652}
3653
60319eb1
PNA		 3654static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3655 int msg_type,
3656 struct nft_set *set)
3657{
3658 struct nft_trans *trans;
3659
3660 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3661 if (trans == NULL)
3662 return NULL;
3663
3664 nft_trans_elem_set(trans) = set;
3665 return trans;
3666}
3667
22fe54d5
PM		 3668void *nft_set_elem_init(const struct nft_set *set,
3669 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3670 const u32 *key, const u32 *data,
22fe54d5 3671 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3672{
3673 struct nft_set_ext *ext;
3674 void *elem;
3675
3676 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3677 if (elem == NULL)
3678 return NULL;
3679
3680 ext = nft_set_elem_ext(set, elem);
3681 nft_set_ext_init(ext, tmpl);
3682
3683 memcpy(nft_set_ext_key(ext), key, set->klen);
3684 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3685 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3686 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3687 *nft_set_ext_expiration(ext) =
d3e2a111 3688 jiffies + timeout;
c3e1b005
PM		 3689 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3690 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3691
3692 return elem;
3693}
3694
61f9e292
LZ		 3695void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3696 bool destroy_expr)
61edafbb
PM		 3697{
3698 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3699
59105446 3700 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 3701 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 3702 nft_data_release(nft_set_ext_data(ext), set->dtype);
61f9e292 3703 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3704 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3705 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3706 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3707 kfree(elem);
3708}
3709EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3710
59105446
PNA		 3711/* Only called from commit path, nft_set_elem_deactivate() already deals with
3712 * the refcounting from the preparation phase.
3713 */
3714static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3715{
3716 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3717
3718 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3719 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3720 kfree(elem);
3721}
3722
0e9091d6
PNA		 3723static int nft_setelem_parse_flags(const struct nft_set *set,
3724 const struct nlattr *attr, u32 *flags)
3725{
3726 if (attr == NULL)
3727 return 0;
3728
3729 *flags = ntohl(nla_get_be32(attr));
3730 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3731 return -EINVAL;
3732 if (!(set->flags & NFT_SET_INTERVAL) &&
3733 *flags & NFT_SET_ELEM_INTERVAL_END)
3734 return -EINVAL;
3735
3736 return 0;
3737}
3738
60319eb1 3739static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3740 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3741{
3742 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3743 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3744 struct nft_data_desc d1, d2;
fe2811eb 3745 struct nft_set_ext_tmpl tmpl;
c016c7e4 3746 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3747 struct nft_set_elem elem;
3748 struct nft_set_binding *binding;
8aeff920 3749 struct nft_object *obj = NULL;
68e942e8 3750 struct nft_userdata *udata;
fe2811eb 3751 struct nft_data data;
20a69341 3752 enum nft_registers dreg;
60319eb1 3753 struct nft_trans *trans;
0e9091d6 3754 u32 flags = 0;
c3e1b005 3755 u64 timeout;
68e942e8 3756 u8 ulen;
20a69341
PM		 3757 int err;
3758
3759 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3760 nft_set_elem_policy, NULL);
20a69341
PM		 3761 if (err < 0)
3762 return err;
3763
3764 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3765 return -EINVAL;
3766
fe2811eb
PM		 3767 nft_set_ext_prepare(&tmpl);
3768
0e9091d6
PNA		 3769 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3770 if (err < 0)
3771 return err;
3772 if (flags != 0)
3773 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3774
3775 if (set->flags & NFT_SET_MAP) {
3776 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3777 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3778 return -EINVAL;
bd7fc645 3779 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3780 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3781 return -EINVAL;
20a69341
PM		 3782 } else {
3783 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3784 return -EINVAL;
3785 }
3786
c3e1b005
PM		 3787 timeout = 0;
3788 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3789 if (!(set->flags & NFT_SET_TIMEOUT))
3790 return -EINVAL;
d3e2a111
AP		 3791 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3792 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3793 } else if (set->flags & NFT_SET_TIMEOUT) {
3794 timeout = set->timeout;
3795 }
3796
7d740264 3797 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3798 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3799 if (err < 0)
3800 goto err1;
3801 err = -EINVAL;
3802 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3803 goto err2;
3804
7d740264 3805 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3806 if (timeout > 0) {
3807 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3808 if (timeout != set->timeout)
3809 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3810 }
fe2811eb 3811
8aeff920
PNA		 3812 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3813 if (!(set->flags & NFT_SET_OBJECT)) {
3814 err = -EINVAL;
3815 goto err2;
3816 }
3817 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3818 set->objtype, genmask);
3819 if (IS_ERR(obj)) {
3820 err = PTR_ERR(obj);
3821 goto err2;
3822 }
3823 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3824 }
3825
20a69341 3826 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3827 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3828 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3829 if (err < 0)
3830 goto err2;
3831
3832 err = -EINVAL;
3833 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3834 goto err3;
3835
3836 dreg = nft_type_to_reg(set->dtype);
3837 list_for_each_entry(binding, &set->bindings, list) {
3838 struct nft_ctx bind_ctx = {
58c78e10 3839 .net = ctx->net,
20a69341
PM		 3840 .afi = ctx->afi,
3841 .table = ctx->table,
7c95f6d8 3842 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3843 };
3844
11113e19
PM		 3845 if (!(binding->flags & NFT_SET_MAP))
3846 continue;
3847
1ec10212
PM		 3848 err = nft_validate_register_store(&bind_ctx, dreg,
3849 &data,
3850 d2.type, d2.len);
20a69341
PM		 3851 if (err < 0)
3852 goto err3;
3853 }
fe2811eb 3854
7d740264 3855 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3856 }
3857
68e942e8
PM		 3858 /* The full maximum length of userdata can exceed the maximum
3859 * offset value (U8_MAX) for following extensions, therefor it
3860 * must be the last extension added.
3861 */
3862 ulen = 0;
3863 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3864 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3865 if (ulen > 0)
3866 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3867 ulen);
3868 }
3869
fe2811eb 3870 err = -ENOMEM;
7d740264 3871 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3872 timeout, GFP_KERNEL);
fe2811eb
PM		 3873 if (elem.priv == NULL)
3874 goto err3;
3875
3876 ext = nft_set_elem_ext(set, elem.priv);
3877 if (flags)
3878 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3879 if (ulen > 0) {
3880 udata = nft_set_ext_userdata(ext);
3881 udata->len = ulen - 1;
3882 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3883 }
8aeff920
PNA		 3884 if (obj) {
3885 *nft_set_ext_obj(ext) = obj;
3886 obj->use++;
3887 }
fe2811eb 3888
60319eb1
PNA		 3889 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3890 if (trans == NULL)
fe2811eb 3891 goto err4;
60319eb1 3892
69086658 3893 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 3894 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3895 if (err) {
3896 if (err == -EEXIST) {
9744a6fc
PNA		 3897 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
3898 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
3899 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
3900 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
3901 return -EBUSY;
8aeff920
PNA		 3902 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3903 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3904 memcmp(nft_set_ext_data(ext),
3905 nft_set_ext_data(ext2), set->dlen) != 0) ||
3906 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3907 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3908 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 3909 err = -EBUSY;
3910 else if (!(nlmsg_flags & NLM_F_EXCL))
3911 err = 0;
3912 }
fe2811eb 3913 goto err5;
c016c7e4 3914 }
20a69341 3915
35d0ac90
PNA		 3916 if (set->size &&
3917 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3918 err = -ENFILE;
3919 goto err6;
3920 }
3921
60319eb1 3922 nft_trans_elem(trans) = elem;
46bbafce 3923 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3924 return 0;
3925
35d0ac90 3926err6:
5cb82a38 3927 set->ops->remove(ctx->net, set, &elem);
fe2811eb 3928err5:
60319eb1 3929 kfree(trans);
fe2811eb
PM		 3930err4:
3931 kfree(elem.priv);
20a69341
PM		 3932err3:
3933 if (nla[NFTA_SET_ELEM_DATA] != NULL)
59105446 3934 nft_data_release(&data, d2.type);
20a69341 3935err2:
59105446 3936 nft_data_release(&elem.key.val, d1.type);
20a69341
PM		 3937err1:
3938 return err;
3939}
3940
633c9a84
PNA		 3941static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3942 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3943 const struct nlattr * const nla[],
3944 struct netlink_ext_ack *extack)
20a69341 3945{
f2a6d766 3946 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3947 const struct nlattr *attr;
3948 struct nft_set *set;
3949 struct nft_ctx ctx;
60319eb1 3950 int rem, err = 0;
20a69341 3951
7d5570ca
PNA		 3952 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3953 return -EINVAL;
3954
f2a6d766 3955 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3956 if (err < 0)
3957 return err;
3958
37a9cc52
PNA		 3959 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3960 genmask);
958bee14
PNA		 3961 if (IS_ERR(set)) {
3962 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3963 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3964 nla[NFTA_SET_ELEM_LIST_SET_ID],
3965 genmask);
958bee14
PNA		 3966 }
3967 if (IS_ERR(set))
3968 return PTR_ERR(set);
3969 }
3970
20a69341
PM		 3971 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3972 return -EBUSY;
3973
3974 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 3975 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 3976 if (err < 0)
60319eb1 3977 break;
20a69341 3978 }
60319eb1 3979 return err;
20a69341
PM		 3980}
3981
59105446
PNA		 3982/**
3983 * nft_data_hold - hold a nft_data item
3984 *
3985 * @data: struct nft_data to release
3986 * @type: type of data
3987 *
3988 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3989 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
3990 * NFT_GOTO verdicts. This function must be called on active data objects
3991 * from the second phase of the commit protocol.
3992 */
3993static void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
3994{
3995 if (type == NFT_DATA_VERDICT) {
3996 switch (data->verdict.code) {
3997 case NFT_JUMP:
3998 case NFT_GOTO:
3999 data->verdict.chain->use++;
4000 break;
4001 }
4002 }
4003}
4004
4005static void nft_set_elem_activate(const struct net *net,
4006 const struct nft_set *set,
4007 struct nft_set_elem *elem)
4008{
4009 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4010
4011 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4012 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4013 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4014 (*nft_set_ext_obj(ext))->use++;
4015}
4016
4017static void nft_set_elem_deactivate(const struct net *net,
4018 const struct nft_set *set,
4019 struct nft_set_elem *elem)
4020{
4021 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4022
4023 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4024 nft_data_release(nft_set_ext_data(ext), set->dtype);
4025 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4026 (*nft_set_ext_obj(ext))->use--;
4027}
4028
60319eb1 4029static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 4030 const struct nlattr *attr)
4031{
4032 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 4033 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 4034 struct nft_data_desc desc;
4035 struct nft_set_elem elem;
3971ca14 4036 struct nft_set_ext *ext;
60319eb1 4037 struct nft_trans *trans;
3971ca14
PNA		 4038 u32 flags = 0;
4039 void *priv;
20a69341
PM		 4040 int err;
4041
4042 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4043 nft_set_elem_policy, NULL);
20a69341
PM		 4044 if (err < 0)
4045 goto err1;
4046
4047 err = -EINVAL;
4048 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4049 goto err1;
4050
3971ca14
PNA		 4051 nft_set_ext_prepare(&tmpl);
4052
4053 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4054 if (err < 0)
4055 return err;
4056 if (flags != 0)
4057 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4058
7d740264 4059 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 4060 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4061 if (err < 0)
4062 goto err1;
4063
4064 err = -EINVAL;
4065 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4066 goto err2;
4067
3971ca14
PNA		 4068 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4069
4070 err = -ENOMEM;
4071 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4072 GFP_KERNEL);
4073 if (elem.priv == NULL)
4074 goto err2;
4075
4076 ext = nft_set_elem_ext(set, elem.priv);
4077 if (flags)
4078 *nft_set_ext_flags(ext) = flags;
4079
60319eb1 4080 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 4081 if (trans == NULL) {
4082 err = -ENOMEM;
3971ca14 4083 goto err3;
609ccf08 4084 }
20a69341 4085
42a55769 4086 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 4087 if (priv == NULL) {
cc02e457 4088 err = -ENOENT;
3971ca14 4089 goto err4;
cc02e457 4090 }
3971ca14
PNA		 4091 kfree(elem.priv);
4092 elem.priv = priv;
cc02e457 4093
59105446
PNA		 4094 nft_set_elem_deactivate(ctx->net, set, &elem);
4095
60319eb1 4096 nft_trans_elem(trans) = elem;
46bbafce 4097 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 4098 return 0;
cc02e457 4099
3971ca14 4100err4:
cc02e457 4101 kfree(trans);
3971ca14
PNA		 4102err3:
4103 kfree(elem.priv);
20a69341 4104err2:
59105446 4105 nft_data_release(&elem.key.val, desc.type);
20a69341
PM		 4106err1:
4107 return err;
4108}
4109
8411b644 4110static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 4111 struct nft_set *set,
8411b644 4112 const struct nft_set_iter *iter,
de70185d 4113 struct nft_set_elem *elem)
8411b644
PNA		 4114{
4115 struct nft_trans *trans;
4116 int err;
4117
4118 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4119 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4120 if (!trans)
4121 return -ENOMEM;
4122
1ba1c414 4123 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 4124 err = -ENOENT;
4125 goto err1;
4126 }
b2c11e4b 4127 set->ndeact++;
8411b644 4128
de70185d
PNA		 4129 nft_trans_elem_set(trans) = set;
4130 nft_trans_elem(trans) = *elem;
8411b644
PNA		 4131 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4132
4133 return 0;
4134err1:
4135 kfree(trans);
4136 return err;
4137}
4138
633c9a84
PNA		 4139static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4140 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4141 const struct nlattr * const nla[],
4142 struct netlink_ext_ack *extack)
20a69341 4143{
f2a6d766 4144 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4145 const struct nlattr *attr;
4146 struct nft_set *set;
4147 struct nft_ctx ctx;
60319eb1 4148 int rem, err = 0;
20a69341 4149
f2a6d766 4150 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 4151 if (err < 0)
4152 return err;
4153
37a9cc52
PNA		 4154 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4155 genmask);
20a69341
PM		 4156 if (IS_ERR(set))
4157 return PTR_ERR(set);
4158 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4159 return -EBUSY;
4160
8411b644 4161 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 4162 struct nft_set_iter iter = {
4163 .genmask = genmask,
4164 .fn = nft_flush_set,
8411b644 4165 };
baa2d42c 4166 set->ops->walk(&ctx, set, &iter);
8411b644 4167
baa2d42c 4168 return iter.err;
8411b644
PNA		 4169 }
4170
20a69341
PM		 4171 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4172 err = nft_del_setelem(&ctx, set, attr);
4173 if (err < 0)
60319eb1 4174 break;
4fefee57 4175
3dd0673a 4176 set->ndeact++;
20a69341 4177 }
60319eb1 4178 return err;
20a69341
PM		 4179}
4180
cfed7e1b
PM		 4181void nft_set_gc_batch_release(struct rcu_head *rcu)
4182{
4183 struct nft_set_gc_batch *gcb;
4184 unsigned int i;
4185
4186 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4187 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4188 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4189 kfree(gcb);
4190}
4191EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4192
4193struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4194 gfp_t gfp)
4195{
4196 struct nft_set_gc_batch *gcb;
4197
4198 gcb = kzalloc(sizeof(*gcb), gfp);
4199 if (gcb == NULL)
4200 return gcb;
4201 gcb->head.set = set;
4202 return gcb;
4203}
4204EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4205
e5009240
PNA		 4206/*
4207 * Stateful objects
4208 */
4209
4210/**
4211 * nft_register_obj- register nf_tables stateful object type
4212 * @obj: object type
4213 *
4214 * Registers the object type for use with nf_tables. Returns zero on
4215 * success or a negative errno code otherwise.
4216 */
4217int nft_register_obj(struct nft_object_type *obj_type)
4218{
4219 if (obj_type->type == NFT_OBJECT_UNSPEC)
4220 return -EINVAL;
4221
4222 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4223 list_add_rcu(&obj_type->list, &nf_tables_objects);
4224 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4225 return 0;
4226}
4227EXPORT_SYMBOL_GPL(nft_register_obj);
4228
4229/**
4230 * nft_unregister_obj - unregister nf_tables object type
4231 * @obj: object type
4232 *
4233 * Unregisters the object type for use with nf_tables.
4234 */
4235void nft_unregister_obj(struct nft_object_type *obj_type)
4236{
4237 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4238 list_del_rcu(&obj_type->list);
4239 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4240}
4241EXPORT_SYMBOL_GPL(nft_unregister_obj);
4242
4243struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4244 const struct nlattr *nla,
4245 u32 objtype, u8 genmask)
4246{
4247 struct nft_object *obj;
4248
4249 list_for_each_entry(obj, &table->objects, list) {
4250 if (!nla_strcmp(nla, obj->name) &&
4251 objtype == obj->type->type &&
4252 nft_active_genmask(obj, genmask))
4253 return obj;
4254 }
4255 return ERR_PTR(-ENOENT);
4256}
4257EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4258
4259static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4260 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4261 .len = NFT_TABLE_MAXNAMELEN - 1 },
4262 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4263 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4264 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4265 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4266};
4267
84fba055
FW		 4268static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4269 const struct nft_object_type *type,
e5009240
PNA		 4270 const struct nlattr *attr)
4271{
4272 struct nlattr *tb[type->maxattr + 1];
4273 struct nft_object *obj;
4274 int err;
4275
4276 if (attr) {
fceb6435
JB		 4277 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4278 NULL);
e5009240
PNA		 4279 if (err < 0)
4280 goto err1;
4281 } else {
4282 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4283 }
4284
4285 err = -ENOMEM;
4286 obj = kzalloc(sizeof(struct nft_object) + type->size, GFP_KERNEL);
4287 if (obj == NULL)
4288 goto err1;
4289
84fba055 4290 err = type->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240
PNA		 4291 if (err < 0)
4292 goto err2;
4293
4294 obj->type = type;
4295 return obj;
4296err2:
4297 kfree(obj);
4298err1:
4299 return ERR_PTR(err);
4300}
4301
4302static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4303 struct nft_object *obj, bool reset)
e5009240
PNA		 4304{
4305 struct nlattr *nest;
4306
4307 nest = nla_nest_start(skb, attr);
4308 if (!nest)
4309 goto nla_put_failure;
43da04a5 4310 if (obj->type->dump(skb, obj, reset) < 0)
e5009240
PNA		 4311 goto nla_put_failure;
4312 nla_nest_end(skb, nest);
4313 return 0;
4314
4315nla_put_failure:
4316 return -1;
4317}
4318
4319static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4320{
4321 const struct nft_object_type *type;
4322
4323 list_for_each_entry(type, &nf_tables_objects, list) {
4324 if (objtype == type->type)
4325 return type;
4326 }
4327 return NULL;
4328}
4329
4330static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4331{
4332 const struct nft_object_type *type;
4333
4334 type = __nft_obj_type_get(objtype);
4335 if (type != NULL && try_module_get(type->owner))
4336 return type;
4337
4338#ifdef CONFIG_MODULES
4339 if (type == NULL) {
4340 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4341 request_module("nft-obj-%u", objtype);
4342 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4343 if (__nft_obj_type_get(objtype))
4344 return ERR_PTR(-EAGAIN);
4345 }
4346#endif
4347 return ERR_PTR(-ENOENT);
4348}
4349
4350static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4351 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4352 const struct nlattr * const nla[],
4353 struct netlink_ext_ack *extack)
e5009240
PNA		 4354{
4355 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4356 const struct nft_object_type *type;
4357 u8 genmask = nft_genmask_next(net);
4358 int family = nfmsg->nfgen_family;
4359 struct nft_af_info *afi;
4360 struct nft_table *table;
4361 struct nft_object *obj;
4362 struct nft_ctx ctx;
4363 u32 objtype;
4364 int err;
4365
4366 if (!nla[NFTA_OBJ_TYPE] ||
4367 !nla[NFTA_OBJ_NAME] ||
4368 !nla[NFTA_OBJ_DATA])
4369 return -EINVAL;
4370
4371 afi = nf_tables_afinfo_lookup(net, family, true);
4372 if (IS_ERR(afi))
4373 return PTR_ERR(afi);
4374
4375 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4376 if (IS_ERR(table))
4377 return PTR_ERR(table);
4378
4379 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4380 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4381 if (IS_ERR(obj)) {
4382 err = PTR_ERR(obj);
4383 if (err != -ENOENT)
4384 return err;
4385
1a28ad74 4386 } else {
e5009240
PNA		 4387 if (nlh->nlmsg_flags & NLM_F_EXCL)
4388 return -EEXIST;
4389
4390 return 0;
4391 }
4392
4393 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4394
4395 type = nft_obj_type_get(objtype);
4396 if (IS_ERR(type))
4397 return PTR_ERR(type);
4398
84fba055 4399 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4400 if (IS_ERR(obj)) {
4401 err = PTR_ERR(obj);
4402 goto err1;
4403 }
18965317 4404 obj->table = table;
e5009240
PNA		 4405 nla_strlcpy(obj->name, nla[NFTA_OBJ_NAME], NFT_OBJ_MAXNAMELEN);
4406
4407 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4408 if (err < 0)
4409 goto err2;
4410
4411 list_add_tail_rcu(&obj->list, &table->objects);
4412 table->use++;
4413 return 0;
4414err2:
4415 if (obj->type->destroy)
4416 obj->type->destroy(obj);
4417 kfree(obj);
4418err1:
4419 module_put(type->owner);
4420 return err;
4421}
4422
4423static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4424 u32 portid, u32 seq, int event, u32 flags,
4425 int family, const struct nft_table *table,
43da04a5 4426 struct nft_object *obj, bool reset)
e5009240
PNA		 4427{
4428 struct nfgenmsg *nfmsg;
4429 struct nlmsghdr *nlh;
4430
dedb67c4 4431 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 4432 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4433 if (nlh == NULL)
4434 goto nla_put_failure;
4435
4436 nfmsg = nlmsg_data(nlh);
4437 nfmsg->nfgen_family = family;
4438 nfmsg->version = NFNETLINK_V0;
4439 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4440
4441 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4442 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4443 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->type->type)) ||
4444 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4445 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4446 goto nla_put_failure;
4447
4448 nlmsg_end(skb, nlh);
4449 return 0;
4450
4451nla_put_failure:
4452 nlmsg_trim(skb, nlh);
4453 return -1;
4454}
4455
a9fea2a3 4456struct nft_obj_filter {
e46abbcc 4457 char *table;
a9fea2a3
PNA		 4458 u32 type;
4459};
4460
e5009240
PNA		 4461static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4462{
4463 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4464 const struct nft_af_info *afi;
4465 const struct nft_table *table;
e5009240 4466 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4467 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4468 struct net *net = sock_net(skb->sk);
4469 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4470 struct nft_object *obj;
4471 bool reset = false;
4472
4473 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4474 reset = true;
e5009240
PNA		 4475
4476 rcu_read_lock();
4477 cb->seq = net->nft.base_seq;
4478
4479 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4480 if (family != NFPROTO_UNSPEC && family != afi->family)
4481 continue;
4482
4483 list_for_each_entry_rcu(table, &afi->tables, list) {
4484 list_for_each_entry_rcu(obj, &table->objects, list) {
4485 if (!nft_is_active(net, obj))
4486 goto cont;
4487 if (idx < s_idx)
4488 goto cont;
4489 if (idx > s_idx)
4490 memset(&cb->args[1], 0,
4491 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4492 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4493 strcmp(filter->table, table->name))
4494 goto cont;
d21e540b
LZ		 4495 if (filter &&
4496 filter->type != NFT_OBJECT_UNSPEC &&
a9fea2a3
PNA		 4497 obj->type->type != filter->type)
4498 goto cont;
4499
e5009240
PNA		 4500 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4501 cb->nlh->nlmsg_seq,
4502 NFT_MSG_NEWOBJ,
4503 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4504 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4505 goto done;
4506
4507 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4508cont:
4509 idx++;
4510 }
4511 }
4512 }
4513done:
4514 rcu_read_unlock();
4515
4516 cb->args[0] = idx;
4517 return skb->len;
4518}
4519
a9fea2a3
PNA		 4520static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4521{
e46abbcc
PS		 4522 struct nft_obj_filter *filter = cb->data;
4523
4524 kfree(filter->table);
4525 kfree(filter);
a9fea2a3
PNA		 4526
4527 return 0;
4528}
4529
4530static struct nft_obj_filter *
4531nft_obj_filter_alloc(const struct nlattr * const nla[])
4532{
4533 struct nft_obj_filter *filter;
4534
4535 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4536 if (!filter)
4537 return ERR_PTR(-ENOMEM);
4538
e46abbcc
PS		 4539 if (nla[NFTA_OBJ_TABLE]) {
4540 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4541 if (!filter->table) {
4542 kfree(filter);
4543 return ERR_PTR(-ENOMEM);
4544 }
4545 }
a9fea2a3
PNA		 4546 if (nla[NFTA_OBJ_TYPE])
4547 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4548
4549 return filter;
4550}
4551
e5009240
PNA		 4552static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4553 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4554 const struct nlattr * const nla[],
4555 struct netlink_ext_ack *extack)
e5009240
PNA		 4556{
4557 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4558 u8 genmask = nft_genmask_cur(net);
4559 int family = nfmsg->nfgen_family;
4560 const struct nft_af_info *afi;
4561 const struct nft_table *table;
4562 struct nft_object *obj;
4563 struct sk_buff *skb2;
43da04a5 4564 bool reset = false;
e5009240
PNA		 4565 u32 objtype;
4566 int err;
4567
4568 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4569 struct netlink_dump_control c = {
4570 .dump = nf_tables_dump_obj,
a9fea2a3 4571 .done = nf_tables_dump_obj_done,
e5009240 4572 };
a9fea2a3
PNA		 4573
4574 if (nla[NFTA_OBJ_TABLE] ||
4575 nla[NFTA_OBJ_TYPE]) {
4576 struct nft_obj_filter *filter;
4577
4578 filter = nft_obj_filter_alloc(nla);
4579 if (IS_ERR(filter))
4580 return -ENOMEM;
4581
4582 c.data = filter;
4583 }
e5009240
PNA		 4584 return netlink_dump_start(nlsk, skb, nlh, &c);
4585 }
4586
4587 if (!nla[NFTA_OBJ_NAME] ||
4588 !nla[NFTA_OBJ_TYPE])
4589 return -EINVAL;
4590
4591 afi = nf_tables_afinfo_lookup(net, family, false);
4592 if (IS_ERR(afi))
4593 return PTR_ERR(afi);
4594
4595 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4596 if (IS_ERR(table))
4597 return PTR_ERR(table);
4598
4599 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4600 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4601 if (IS_ERR(obj))
4602 return PTR_ERR(obj);
4603
4604 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4605 if (!skb2)
4606 return -ENOMEM;
4607
43da04a5
PNA		 4608 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4609 reset = true;
4610
e5009240
PNA		 4611 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4612 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4613 family, table, obj, reset);
e5009240
PNA		 4614 if (err < 0)
4615 goto err;
4616
4617 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4618err:
4619 kfree_skb(skb2);
4620 return err;
e5009240
PNA		 4621}
4622
4623static void nft_obj_destroy(struct nft_object *obj)
4624{
4625 if (obj->type->destroy)
4626 obj->type->destroy(obj);
4627
4628 module_put(obj->type->owner);
4629 kfree(obj);
4630}
4631
4632static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 4633 struct sk_buff *skb, const struct nlmsghdr *nlh,
4634 const struct nlattr * const nla[],
4635 struct netlink_ext_ack *extack)
e5009240
PNA		 4636{
4637 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4638 u8 genmask = nft_genmask_next(net);
4639 int family = nfmsg->nfgen_family;
4640 struct nft_af_info *afi;
4641 struct nft_table *table;
4642 struct nft_object *obj;
4643 struct nft_ctx ctx;
4644 u32 objtype;
4645
4646 if (!nla[NFTA_OBJ_TYPE] ||
4647 !nla[NFTA_OBJ_NAME])
4648 return -EINVAL;
4649
4650 afi = nf_tables_afinfo_lookup(net, family, true);
4651 if (IS_ERR(afi))
4652 return PTR_ERR(afi);
4653
4654 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4655 if (IS_ERR(table))
4656 return PTR_ERR(table);
4657
4658 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4659 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4660 if (IS_ERR(obj))
4661 return PTR_ERR(obj);
4662 if (obj->use > 0)
4663 return -EBUSY;
4664
4665 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4666
4667 return nft_delobj(&ctx, obj);
4668}
4669
25e94a99
PNA		 4670void nft_obj_notify(struct net *net, struct nft_table *table,
4671 struct nft_object *obj, u32 portid, u32 seq, int event,
4672 int family, int report, gfp_t gfp)
e5009240
PNA		 4673{
4674 struct sk_buff *skb;
4675 int err;
4676
2599e989
PNA		 4677 if (!report &&
4678 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4679 return;
e5009240 4680
2599e989 4681 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4682 if (skb == NULL)
4683 goto err;
4684
2599e989
PNA		 4685 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4686 table, obj, false);
e5009240
PNA		 4687 if (err < 0) {
4688 kfree_skb(skb);
4689 goto err;
4690 }
4691
25e94a99
PNA		 4692 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4693 return;
e5009240 4694err:
25e94a99 4695 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 4696}
2599e989
PNA		 4697EXPORT_SYMBOL_GPL(nft_obj_notify);
4698
25e94a99
PNA		 4699static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4700 struct nft_object *obj, int event)
2599e989 4701{
25e94a99
PNA		 4702 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4703 ctx->afi->family, ctx->report, GFP_KERNEL);
2599e989 4704}
e5009240 4705
84d7fce6
PNA		 4706static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4707 u32 portid, u32 seq)
4708{
4709 struct nlmsghdr *nlh;
4710 struct nfgenmsg *nfmsg;
784b4e61 4711 char buf[TASK_COMM_LEN];
dedb67c4 4712 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 4713
4714 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4715 if (nlh == NULL)
4716 goto nla_put_failure;
4717
4718 nfmsg = nlmsg_data(nlh);
4719 nfmsg->nfgen_family = AF_UNSPEC;
4720 nfmsg->version = NFNETLINK_V0;
4721 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4722
784b4e61
PS		 4723 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
4724 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
4725 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 4726 goto nla_put_failure;
4727
053c095a
JB		 4728 nlmsg_end(skb, nlh);
4729 return 0;
84d7fce6
PNA		 4730
4731nla_put_failure:
4732 nlmsg_trim(skb, nlh);
4733 return -EMSGSIZE;
4734}
4735
25e94a99
PNA		 4736static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4737 int event)
84d7fce6
PNA		 4738{
4739 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4740 struct sk_buff *skb2;
4741 int err;
4742
4743 if (nlmsg_report(nlh) &&
4744 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4745 return;
84d7fce6 4746
84d7fce6
PNA		 4747 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4748 if (skb2 == NULL)
4749 goto err;
4750
4751 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4752 nlh->nlmsg_seq);
4753 if (err < 0) {
4754 kfree_skb(skb2);
4755 goto err;
4756 }
4757
25e94a99
PNA		 4758 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4759 nlmsg_report(nlh), GFP_KERNEL);
4760 return;
84d7fce6 4761err:
25e94a99
PNA		 4762 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4763 -ENOBUFS);
84d7fce6
PNA		 4764}
4765
7b8002a1
PNA		 4766static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4767 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4768 const struct nlattr * const nla[],
4769 struct netlink_ext_ack *extack)
84d7fce6 4770{
84d7fce6
PNA		 4771 struct sk_buff *skb2;
4772 int err;
4773
4774 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4775 if (skb2 == NULL)
4776 return -ENOMEM;
4777
4778 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4779 nlh->nlmsg_seq);
4780 if (err < 0)
4781 goto err;
4782
4783 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4784err:
4785 kfree_skb(skb2);
4786 return err;
4787}
4788
96518518
PM		 4789static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4790 [NFT_MSG_NEWTABLE] = {
55dd6f93 4791 .call_batch = nf_tables_newtable,
96518518
PM		 4792 .attr_count = NFTA_TABLE_MAX,
4793 .policy = nft_table_policy,
4794 },
4795 [NFT_MSG_GETTABLE] = {
4796 .call = nf_tables_gettable,
4797 .attr_count = NFTA_TABLE_MAX,
4798 .policy = nft_table_policy,
4799 },
4800 [NFT_MSG_DELTABLE] = {
55dd6f93 4801 .call_batch = nf_tables_deltable,
96518518
PM		 4802 .attr_count = NFTA_TABLE_MAX,
4803 .policy = nft_table_policy,
4804 },
4805 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4806 .call_batch = nf_tables_newchain,
96518518
PM		 4807 .attr_count = NFTA_CHAIN_MAX,
4808 .policy = nft_chain_policy,
4809 },
4810 [NFT_MSG_GETCHAIN] = {
4811 .call = nf_tables_getchain,
4812 .attr_count = NFTA_CHAIN_MAX,
4813 .policy = nft_chain_policy,
4814 },
4815 [NFT_MSG_DELCHAIN] = {
91c7b38d 4816 .call_batch = nf_tables_delchain,
96518518
PM		 4817 .attr_count = NFTA_CHAIN_MAX,
4818 .policy = nft_chain_policy,
4819 },
4820 [NFT_MSG_NEWRULE] = {
0628b123 4821 .call_batch = nf_tables_newrule,
96518518
PM		 4822 .attr_count = NFTA_RULE_MAX,
4823 .policy = nft_rule_policy,
4824 },
4825 [NFT_MSG_GETRULE] = {
4826 .call = nf_tables_getrule,
4827 .attr_count = NFTA_RULE_MAX,
4828 .policy = nft_rule_policy,
4829 },
4830 [NFT_MSG_DELRULE] = {
0628b123 4831 .call_batch = nf_tables_delrule,
96518518
PM		 4832 .attr_count = NFTA_RULE_MAX,
4833 .policy = nft_rule_policy,
4834 },
20a69341 4835 [NFT_MSG_NEWSET] = {
958bee14 4836 .call_batch = nf_tables_newset,
20a69341
PM		 4837 .attr_count = NFTA_SET_MAX,
4838 .policy = nft_set_policy,
4839 },
4840 [NFT_MSG_GETSET] = {
4841 .call = nf_tables_getset,
4842 .attr_count = NFTA_SET_MAX,
4843 .policy = nft_set_policy,
4844 },
4845 [NFT_MSG_DELSET] = {
958bee14 4846 .call_batch = nf_tables_delset,
20a69341
PM		 4847 .attr_count = NFTA_SET_MAX,
4848 .policy = nft_set_policy,
4849 },
4850 [NFT_MSG_NEWSETELEM] = {
958bee14 4851 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4852 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4853 .policy = nft_set_elem_list_policy,
4854 },
4855 [NFT_MSG_GETSETELEM] = {
4856 .call = nf_tables_getsetelem,
4857 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4858 .policy = nft_set_elem_list_policy,
4859 },
4860 [NFT_MSG_DELSETELEM] = {
958bee14 4861 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4862 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4863 .policy = nft_set_elem_list_policy,
4864 },
84d7fce6
PNA		 4865 [NFT_MSG_GETGEN] = {
4866 .call = nf_tables_getgen,
4867 },
e5009240
PNA		 4868 [NFT_MSG_NEWOBJ] = {
4869 .call_batch = nf_tables_newobj,
4870 .attr_count = NFTA_OBJ_MAX,
4871 .policy = nft_obj_policy,
4872 },
4873 [NFT_MSG_GETOBJ] = {
4874 .call = nf_tables_getobj,
4875 .attr_count = NFTA_OBJ_MAX,
4876 .policy = nft_obj_policy,
4877 },
4878 [NFT_MSG_DELOBJ] = {
4879 .call_batch = nf_tables_delobj,
4880 .attr_count = NFTA_OBJ_MAX,
4881 .policy = nft_obj_policy,
4882 },
43da04a5
PNA		 4883 [NFT_MSG_GETOBJ_RESET] = {
4884 .call = nf_tables_getobj,
4885 .attr_count = NFTA_OBJ_MAX,
4886 .policy = nft_obj_policy,
4887 },
96518518
PM		 4888};
4889
91c7b38d
PNA		 4890static void nft_chain_commit_update(struct nft_trans *trans)
4891{
4892 struct nft_base_chain *basechain;
4893
b7263e07 4894 if (nft_trans_chain_name(trans))
91c7b38d
PNA		 4895 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4896
f323d954 4897 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 4898 return;
4899
4900 basechain = nft_base_chain(trans->ctx.chain);
4901 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4902
4903 switch (nft_trans_chain_policy(trans)) {
4904 case NF_DROP:
4905 case NF_ACCEPT:
4906 basechain->policy = nft_trans_chain_policy(trans);
4907 break;
4908 }
4909}
4910
b326dd37 4911static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 4912{
c7c32e72
PNA		 4913 switch (trans->msg_type) {
4914 case NFT_MSG_DELTABLE:
4915 nf_tables_table_destroy(&trans->ctx);
4916 break;
4917 case NFT_MSG_DELCHAIN:
4918 nf_tables_chain_destroy(trans->ctx.chain);
4919 break;
4920 case NFT_MSG_DELRULE:
4921 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4922 break;
4923 case NFT_MSG_DELSET:
4924 nft_set_destroy(nft_trans_set(trans));
4925 break;
61edafbb 4926 case NFT_MSG_DELSETELEM:
59105446
PNA		 4927 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
4928 nft_trans_elem(trans).priv);
61edafbb 4929 break;
e5009240
PNA		 4930 case NFT_MSG_DELOBJ:
4931 nft_obj_destroy(nft_trans_obj(trans));
4932 break;
c7c32e72
PNA		 4933 }
4934 kfree(trans);
4935}
4936
5913beaf 4937static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 4938{
37082f93 4939 struct nft_trans *trans, *next;
a3716e70 4940 struct nft_trans_elem *te;
37082f93
PNA		 4941
4942 /* Bump generation counter, invalidate any dump in progress */
38e029f1 4943 while (++net->nft.base_seq == 0);
37082f93
PNA		 4944
4945 /* A new generation has just started */
ea4bd995 4946 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 4947
4948 /* Make sure all packets have left the previous generation before
4949 * purging old rules.
4950 */
4951 synchronize_rcu();
4952
4953 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 4954 switch (trans->msg_type) {
55dd6f93
PNA		 4955 case NFT_MSG_NEWTABLE:
4956 if (nft_trans_table_update(trans)) {
4957 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4958 nf_tables_table_disable(net,
4959 trans->ctx.afi,
55dd6f93
PNA		 4960 trans->ctx.table);
4961 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4962 }
4963 } else {
f2a6d766 4964 nft_clear(net, trans->ctx.table);
55dd6f93 4965 }
35151d84 4966 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 4967 nft_trans_destroy(trans);
4968 break;
4969 case NFT_MSG_DELTABLE:
f2a6d766 4970 list_del_rcu(&trans->ctx.table->list);
35151d84 4971 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 4972 break;
91c7b38d
PNA		 4973 case NFT_MSG_NEWCHAIN:
4974 if (nft_trans_chain_update(trans))
4975 nft_chain_commit_update(trans);
4fefee57 4976 else
664b0f8c 4977 nft_clear(net, trans->ctx.chain);
4fefee57 4978
35151d84 4979 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 4980 nft_trans_destroy(trans);
4981 break;
4982 case NFT_MSG_DELCHAIN:
664b0f8c 4983 list_del_rcu(&trans->ctx.chain->list);
35151d84 4984 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 4985 nf_tables_unregister_hooks(trans->ctx.net,
4986 trans->ctx.table,
c5598794
AB		 4987 trans->ctx.chain,
4988 trans->ctx.afi->nops);
91c7b38d 4989 break;
b380e5c7 4990 case NFT_MSG_NEWRULE:
889f7ee7 4991 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 4992 nf_tables_rule_notify(&trans->ctx,
37082f93 4993 nft_trans_rule(trans),
35151d84 4994 NFT_MSG_NEWRULE);
37082f93 4995 nft_trans_destroy(trans);
b380e5c7
PNA		 4996 break;
4997 case NFT_MSG_DELRULE:
4998 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 4999 nf_tables_rule_notify(&trans->ctx,
5000 nft_trans_rule(trans),
5001 NFT_MSG_DELRULE);
b380e5c7 5002 break;
958bee14 5003 case NFT_MSG_NEWSET:
37a9cc52 5004 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 5005 /* This avoids hitting -EBUSY when deleting the table
5006 * from the transaction.
5007 */
5008 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
5009 !list_empty(&nft_trans_set(trans)->bindings))
5010 trans->ctx.table->use--;
5011
958bee14 5012 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 5013 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 5014 nft_trans_destroy(trans);
5015 break;
5016 case NFT_MSG_DELSET:
37a9cc52 5017 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 5018 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 5019 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 5020 break;
60319eb1 5021 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 5022 te = (struct nft_trans_elem *)trans->data;
5023
42a55769 5024 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 5025 nf_tables_setelem_notify(&trans->ctx, te->set,
5026 &te->elem,
60319eb1
PNA		 5027 NFT_MSG_NEWSETELEM, 0);
5028 nft_trans_destroy(trans);
5029 break;
5030 case NFT_MSG_DELSETELEM:
a3716e70 5031 te = (struct nft_trans_elem *)trans->data;
fe2811eb 5032
a3716e70
PNA		 5033 nf_tables_setelem_notify(&trans->ctx, te->set,
5034 &te->elem,
60319eb1 5035 NFT_MSG_DELSETELEM, 0);
5cb82a38 5036 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 5037 atomic_dec(&te->set->nelems);
5038 te->set->ndeact--;
60319eb1 5039 break;
e5009240
PNA		 5040 case NFT_MSG_NEWOBJ:
5041 nft_clear(net, nft_trans_obj(trans));
5042 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5043 NFT_MSG_NEWOBJ);
5044 nft_trans_destroy(trans);
5045 break;
5046 case NFT_MSG_DELOBJ:
5047 list_del_rcu(&nft_trans_obj(trans)->list);
5048 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5049 NFT_MSG_DELOBJ);
5050 break;
37082f93 5051 }
37082f93
PNA		 5052 }
5053
b326dd37
PNA		 5054 synchronize_rcu();
5055
37082f93 5056 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 5057 list_del(&trans->list);
b326dd37 5058 nf_tables_commit_release(trans);
37082f93 5059 }
84d7fce6
PNA		 5060
5061 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 5062
5063 return 0;
5064}
5065
b326dd37 5066static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 5067{
c7c32e72
PNA		 5068 switch (trans->msg_type) {
5069 case NFT_MSG_NEWTABLE:
5070 nf_tables_table_destroy(&trans->ctx);
5071 break;
5072 case NFT_MSG_NEWCHAIN:
5073 nf_tables_chain_destroy(trans->ctx.chain);
5074 break;
5075 case NFT_MSG_NEWRULE:
5076 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5077 break;
5078 case NFT_MSG_NEWSET:
5079 nft_set_destroy(nft_trans_set(trans));
5080 break;
61edafbb
PM		 5081 case NFT_MSG_NEWSETELEM:
5082 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 5083 nft_trans_elem(trans).priv, true);
61edafbb 5084 break;
e5009240
PNA		 5085 case NFT_MSG_NEWOBJ:
5086 nft_obj_destroy(nft_trans_obj(trans));
5087 break;
c7c32e72
PNA		 5088 }
5089 kfree(trans);
5090}
5091
5913beaf 5092static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 5093{
37082f93 5094 struct nft_trans *trans, *next;
02263db0 5095 struct nft_trans_elem *te;
37082f93 5096
a907e36d
XL		 5097 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5098 list) {
b380e5c7 5099 switch (trans->msg_type) {
55dd6f93
PNA		 5100 case NFT_MSG_NEWTABLE:
5101 if (nft_trans_table_update(trans)) {
5102 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 5103 nf_tables_table_disable(net,
5104 trans->ctx.afi,
55dd6f93
PNA		 5105 trans->ctx.table);
5106 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5107 }
5108 nft_trans_destroy(trans);
5109 } else {
e688a7f8 5110 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 5111 }
5112 break;
5113 case NFT_MSG_DELTABLE:
f2a6d766 5114 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 5115 nft_trans_destroy(trans);
5116 break;
91c7b38d
PNA		 5117 case NFT_MSG_NEWCHAIN:
5118 if (nft_trans_chain_update(trans)) {
982f4051 5119 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 5120
5121 nft_trans_destroy(trans);
5122 } else {
4fefee57 5123 trans->ctx.table->use--;
e688a7f8 5124 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 5125 nf_tables_unregister_hooks(trans->ctx.net,
5126 trans->ctx.table,
c5598794
AB		 5127 trans->ctx.chain,
5128 trans->ctx.afi->nops);
91c7b38d
PNA		 5129 }
5130 break;
5131 case NFT_MSG_DELCHAIN:
4fefee57 5132 trans->ctx.table->use++;
664b0f8c 5133 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 5134 nft_trans_destroy(trans);
5135 break;
b380e5c7 5136 case NFT_MSG_NEWRULE:
4fefee57 5137 trans->ctx.chain->use--;
b380e5c7
PNA		 5138 list_del_rcu(&nft_trans_rule(trans)->list);
5139 break;
5140 case NFT_MSG_DELRULE:
4fefee57 5141 trans->ctx.chain->use++;
889f7ee7 5142 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 5143 nft_trans_destroy(trans);
b380e5c7 5144 break;
958bee14 5145 case NFT_MSG_NEWSET:
4fefee57 5146 trans->ctx.table->use--;
e688a7f8 5147 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 5148 break;
5149 case NFT_MSG_DELSET:
4fefee57 5150 trans->ctx.table->use++;
37a9cc52 5151 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 5152 nft_trans_destroy(trans);
5153 break;
60319eb1 5154 case NFT_MSG_NEWSETELEM:
02263db0 5155 te = (struct nft_trans_elem *)trans->data;
fe2811eb 5156
5cb82a38 5157 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 5158 atomic_dec(&te->set->nelems);
60319eb1
PNA		 5159 break;
5160 case NFT_MSG_DELSETELEM:
cc02e457
PM		 5161 te = (struct nft_trans_elem *)trans->data;
5162
59105446 5163 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 5164 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 5165 te->set->ndeact--;
cc02e457 5166
e5009240
PNA		 5167 nft_trans_destroy(trans);
5168 break;
5169 case NFT_MSG_NEWOBJ:
5170 trans->ctx.table->use--;
5171 list_del_rcu(&nft_trans_obj(trans)->list);
5172 break;
5173 case NFT_MSG_DELOBJ:
5174 trans->ctx.table->use++;
5175 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 5176 nft_trans_destroy(trans);
5177 break;
37082f93 5178 }
37082f93
PNA		 5179 }
5180
b326dd37
PNA		 5181 synchronize_rcu();
5182
a1cee076
PNA		 5183 list_for_each_entry_safe_reverse(trans, next,
5184 &net->nft.commit_list, list) {
c7c32e72 5185 list_del(&trans->list);
b326dd37 5186 nf_tables_abort_release(trans);
37082f93
PNA		 5187 }
5188
5189 return 0;
5190}
5191
74e8bcd2
PNA		 5192static bool nf_tables_valid_genid(struct net *net, u32 genid)
5193{
5194 return net->nft.base_seq == genid;
5195}
5196
96518518
PM		 5197static const struct nfnetlink_subsystem nf_tables_subsys = {
5198 .name = "nf_tables",
5199 .subsys_id = NFNL_SUBSYS_NFTABLES,
5200 .cb_count = NFT_MSG_MAX,
5201 .cb = nf_tables_cb,
0628b123
PNA		 5202 .commit = nf_tables_commit,
5203 .abort = nf_tables_abort,
74e8bcd2 5204 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5205};
5206
7210e4e3
PNA		 5207int nft_chain_validate_dependency(const struct nft_chain *chain,
5208 enum nft_chain_type type)
5209{
5210 const struct nft_base_chain *basechain;
5211
f323d954 5212 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 5213 basechain = nft_base_chain(chain);
5214 if (basechain->type->type != type)
5215 return -EOPNOTSUPP;
5216 }
5217 return 0;
5218}
5219EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5220
75e8d06d
PNA		 5221int nft_chain_validate_hooks(const struct nft_chain *chain,
5222 unsigned int hook_flags)
5223{
5224 struct nft_base_chain *basechain;
5225
f323d954 5226 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 5227 basechain = nft_base_chain(chain);
5228
5229 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5230 return 0;
5231
5232 return -EOPNOTSUPP;
5233 }
5234
5235 return 0;
5236}
5237EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5238
20a69341
PM		 5239/*
5240 * Loop detection - walk through the ruleset beginning at the destination chain
5241 * of a new jump until either the source chain is reached (loop) or all
5242 * reachable chains have been traversed.
5243 *
5244 * The loop check is performed whenever a new jump verdict is added to an
5245 * expression or verdict map or a verdict map is bound to a new chain.
5246 */
5247
5248static int nf_tables_check_loops(const struct nft_ctx *ctx,
5249 const struct nft_chain *chain);
5250
5251static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5252 struct nft_set *set,
20a69341 5253 const struct nft_set_iter *iter,
de70185d 5254 struct nft_set_elem *elem)
20a69341 5255{
fe2811eb
PM		 5256 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5257 const struct nft_data *data;
5258
5259 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5260 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5261 return 0;
5262
fe2811eb 5263 data = nft_set_ext_data(ext);
1ca2e170 5264 switch (data->verdict.code) {
20a69341
PM		 5265 case NFT_JUMP:
5266 case NFT_GOTO:
1ca2e170 5267 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5268 default:
5269 return 0;
5270 }
5271}
5272
5273static int nf_tables_check_loops(const struct nft_ctx *ctx,
5274 const struct nft_chain *chain)
5275{
5276 const struct nft_rule *rule;
5277 const struct nft_expr *expr, *last;
de70185d 5278 struct nft_set *set;
20a69341
PM		 5279 struct nft_set_binding *binding;
5280 struct nft_set_iter iter;
20a69341
PM		 5281
5282 if (ctx->chain == chain)
5283 return -ELOOP;
5284
5285 list_for_each_entry(rule, &chain->rules, list) {
5286 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5287 const struct nft_data *data = NULL;
5288 int err;
5289
5290 if (!expr->ops->validate)
20a69341
PM		 5291 continue;
5292
0ca743a5
PNA		 5293 err = expr->ops->validate(ctx, expr, &data);
5294 if (err < 0)
5295 return err;
5296
20a69341 5297 if (data == NULL)
0ca743a5 5298 continue;
20a69341 5299
1ca2e170 5300 switch (data->verdict.code) {
20a69341
PM		 5301 case NFT_JUMP:
5302 case NFT_GOTO:
1ca2e170
PM		 5303 err = nf_tables_check_loops(ctx,
5304 data->verdict.chain);
20a69341
PM		 5305 if (err < 0)
5306 return err;
5307 default:
5308 break;
5309 }
5310 }
5311 }
5312
5313 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5314 if (!nft_is_active_next(ctx->net, set))
5315 continue;
20a69341
PM		 5316 if (!(set->flags & NFT_SET_MAP) ||
5317 set->dtype != NFT_DATA_VERDICT)
5318 continue;
5319
5320 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5321 if (!(binding->flags & NFT_SET_MAP) ||
5322 binding->chain != chain)
20a69341
PM		 5323 continue;
5324
8588ac09 5325 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5326 iter.skip = 0;
5327 iter.count = 0;
5328 iter.err = 0;
5329 iter.fn = nf_tables_loop_check_setelem;
5330
5331 set->ops->walk(ctx, set, &iter);
5332 if (iter.err < 0)
5333 return iter.err;
5334 }
5335 }
5336
5337 return 0;
5338}
5339
36b701fa
LGL		 5340/**
5341 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5342 *
5343 * @attr: netlink attribute to fetch value from
5344 * @max: maximum value to be stored in dest
5345 * @dest: pointer to the variable
5346 *
5347 * Parse, check and store a given u32 netlink attribute into variable.
5348 * This function returns -ERANGE if the value goes over maximum value.
5349 * Otherwise a 0 is returned and the attribute value is stored in the
5350 * destination variable.
5351 */
f1d505bb 5352int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5353{
09525a09 5354 u32 val;
36b701fa
LGL		 5355
5356 val = ntohl(nla_get_be32(attr));
5357 if (val > max)
5358 return -ERANGE;
5359
5360 *dest = val;
5361 return 0;
5362}
5363EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5364
49499c3e
PM		 5365/**
5366 * nft_parse_register - parse a register value from a netlink attribute
5367 *
5368 * @attr: netlink attribute
5369 *
5370 * Parse and translate a register value from a netlink attribute.
5371 * Registers used to be 128 bit wide, these register numbers will be
5372 * mapped to the corresponding 32 bit register numbers.
5373 */
b1c96ed3
PM		 5374unsigned int nft_parse_register(const struct nlattr *attr)
5375{
49499c3e
PM		 5376 unsigned int reg;
5377
5378 reg = ntohl(nla_get_be32(attr));
5379 switch (reg) {
5380 case NFT_REG_VERDICT...NFT_REG_4:
5381 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5382 default:
5383 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5384 }
b1c96ed3
PM		 5385}
5386EXPORT_SYMBOL_GPL(nft_parse_register);
5387
49499c3e
PM		 5388/**
5389 * nft_dump_register - dump a register value to a netlink attribute
5390 *
5391 * @skb: socket buffer
5392 * @attr: attribute number
5393 * @reg: register number
5394 *
5395 * Construct a netlink attribute containing the register number. For
5396 * compatibility reasons, register numbers being a multiple of 4 are
5397 * translated to the corresponding 128 bit register numbers.
5398 */
b1c96ed3
PM		 5399int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5400{
49499c3e
PM		 5401 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5402 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5403 else
5404 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5405
b1c96ed3
PM		 5406 return nla_put_be32(skb, attr, htonl(reg));
5407}
5408EXPORT_SYMBOL_GPL(nft_dump_register);
5409
96518518 5410/**
d07db988 5411 * nft_validate_register_load - validate a load from a register
96518518
PM		 5412 *
5413 * @reg: the register number
d07db988 5414 * @len: the length of the data
96518518
PM		 5415 *
5416 * Validate that the input register is one of the general purpose
d07db988 5417 * registers and that the length of the load is within the bounds.
96518518 5418 */
d07db988 5419int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5420{
49499c3e 5421 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5422 return -EINVAL;
d07db988
PM		 5423 if (len == 0)
5424 return -EINVAL;
49499c3e 5425 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5426 return -ERANGE;
49499c3e 5427
96518518
PM		 5428 return 0;
5429}
d07db988 5430EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5431
96518518 5432/**
1ec10212 5433 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5434 *
5435 * @ctx: context of the expression performing the load
5436 * @reg: the destination register number
5437 * @data: the data to load
5438 * @type: the data type
45d9bcda 5439 * @len: the length of the data
96518518
PM		 5440 *
5441 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5442 * the destination register and the length is within the bounds.
5443 * A value of NULL for the data means that its runtime gathered
58f40ab6 5444 * data.
96518518 5445 */
1ec10212
PM		 5446int nft_validate_register_store(const struct nft_ctx *ctx,
5447 enum nft_registers reg,
5448 const struct nft_data *data,
5449 enum nft_data_types type, unsigned int len)
96518518 5450{
20a69341
PM		 5451 int err;
5452
96518518
PM		 5453 switch (reg) {
5454 case NFT_REG_VERDICT:
58f40ab6 5455 if (type != NFT_DATA_VERDICT)
96518518 5456 return -EINVAL;
20a69341 5457
58f40ab6 5458 if (data != NULL &&
1ca2e170
PM		 5459 (data->verdict.code == NFT_GOTO ||
5460 data->verdict.code == NFT_JUMP)) {
5461 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5462 if (err < 0)
5463 return err;
5464
1ca2e170
PM		 5465 if (ctx->chain->level + 1 >
5466 data->verdict.chain->level) {
20a69341
PM		 5467 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5468 return -EMLINK;
1ca2e170 5469 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5470 }
5471 }
5472
96518518
PM		 5473 return 0;
5474 default:
49499c3e 5475 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5476 return -EINVAL;
45d9bcda
PM		 5477 if (len == 0)
5478 return -EINVAL;
49499c3e
PM		 5479 if (reg * NFT_REG32_SIZE + len >
5480 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5481 return -ERANGE;
27e6d201 5482
96518518
PM		 5483 if (data != NULL && type != NFT_DATA_VALUE)
5484 return -EINVAL;
5485 return 0;
5486 }
5487}
1ec10212 5488EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5489
5490static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5491 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5492 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5493 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5494};
5495
5496static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5497 struct nft_data_desc *desc, const struct nlattr *nla)
5498{
664b0f8c 5499 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5500 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5501 struct nft_chain *chain;
5502 int err;
5503
fceb6435
JB		 5504 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5505 NULL);
96518518
PM		 5506 if (err < 0)
5507 return err;
5508
5509 if (!tb[NFTA_VERDICT_CODE])
5510 return -EINVAL;
1ca2e170 5511 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5512
1ca2e170 5513 switch (data->verdict.code) {
e0abdadc 5514 default:
1ca2e170 5515 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5516 case NF_ACCEPT:
5517 case NF_DROP:
5518 case NF_QUEUE:
5519 break;
5520 default:
5521 return -EINVAL;
5522 }
5523 /* fall through */
96518518
PM		 5524 case NFT_CONTINUE:
5525 case NFT_BREAK:
5526 case NFT_RETURN:
96518518
PM		 5527 break;
5528 case NFT_JUMP:
5529 case NFT_GOTO:
5530 if (!tb[NFTA_VERDICT_CHAIN])
5531 return -EINVAL;
5532 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5533 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5534 if (IS_ERR(chain))
5535 return PTR_ERR(chain);
f323d954 5536 if (nft_is_base_chain(chain))
96518518
PM		 5537 return -EOPNOTSUPP;
5538
96518518 5539 chain->use++;
1ca2e170 5540 data->verdict.chain = chain;
96518518 5541 break;
96518518
PM		 5542 }
5543
4c4ed074 5544 desc->len = sizeof(data->verdict);
96518518
PM		 5545 desc->type = NFT_DATA_VERDICT;
5546 return 0;
5547}
5548
5549static void nft_verdict_uninit(const struct nft_data *data)
5550{
1ca2e170 5551 switch (data->verdict.code) {
96518518
PM		 5552 case NFT_JUMP:
5553 case NFT_GOTO:
1ca2e170 5554 data->verdict.chain->use--;
96518518
PM		 5555 break;
5556 }
5557}
5558
33d5a7b1 5559int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5560{
5561 struct nlattr *nest;
5562
33d5a7b1 5563 nest = nla_nest_start(skb, type);
96518518
PM		 5564 if (!nest)
5565 goto nla_put_failure;
5566
33d5a7b1 5567 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5568 goto nla_put_failure;
5569
33d5a7b1 5570 switch (v->code) {
96518518
PM		 5571 case NFT_JUMP:
5572 case NFT_GOTO:
1ca2e170 5573 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5574 v->chain->name))
96518518
PM		 5575 goto nla_put_failure;
5576 }
5577 nla_nest_end(skb, nest);
5578 return 0;
5579
5580nla_put_failure:
5581 return -1;
5582}
5583
d0a11fc3
PM		 5584static int nft_value_init(const struct nft_ctx *ctx,
5585 struct nft_data *data, unsigned int size,
96518518
PM		 5586 struct nft_data_desc *desc, const struct nlattr *nla)
5587{
5588 unsigned int len;
5589
5590 len = nla_len(nla);
5591 if (len == 0)
5592 return -EINVAL;
d0a11fc3 5593 if (len > size)
96518518
PM		 5594 return -EOVERFLOW;
5595
d0a11fc3 5596 nla_memcpy(data->data, nla, len);
96518518
PM		 5597 desc->type = NFT_DATA_VALUE;
5598 desc->len = len;
5599 return 0;
5600}
5601
5602static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5603 unsigned int len)
5604{
5605 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5606}
5607
5608static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5609 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5610 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5611};
5612
5613/**
5614 * nft_data_init - parse nf_tables data netlink attributes
5615 *
5616 * @ctx: context of the expression using the data
5617 * @data: destination struct nft_data
d0a11fc3 5618 * @size: maximum data length
96518518
PM		 5619 * @desc: data description
5620 * @nla: netlink attribute containing data
5621 *
5622 * Parse the netlink data attributes and initialize a struct nft_data.
5623 * The type and length of data are returned in the data description.
5624 *
5625 * The caller can indicate that it only wants to accept data of type
5626 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5627 */
d0a11fc3
PM		 5628int nft_data_init(const struct nft_ctx *ctx,
5629 struct nft_data *data, unsigned int size,
96518518
PM		 5630 struct nft_data_desc *desc, const struct nlattr *nla)
5631{
5632 struct nlattr *tb[NFTA_DATA_MAX + 1];
5633 int err;
5634
fceb6435 5635 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 5636 if (err < 0)
5637 return err;
5638
5639 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5640 return nft_value_init(ctx, data, size, desc,
5641 tb[NFTA_DATA_VALUE]);
96518518
PM		 5642 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5643 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5644 return -EINVAL;
5645}
5646EXPORT_SYMBOL_GPL(nft_data_init);
5647
5648/**
59105446 5649 * nft_data_release - release a nft_data item
96518518
PM		 5650 *
5651 * @data: struct nft_data to release
5652 * @type: type of data
5653 *
5654 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5655 * all others need to be released by calling this function.
5656 */
59105446 5657void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 5658{
960bd2c2 5659 if (type < NFT_DATA_VERDICT)
96518518 5660 return;
960bd2c2 5661 switch (type) {
96518518
PM		 5662 case NFT_DATA_VERDICT:
5663 return nft_verdict_uninit(data);
5664 default:
5665 WARN_ON(1);
5666 }
5667}
59105446 5668EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 5669
5670int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5671 enum nft_data_types type, unsigned int len)
5672{
5673 struct nlattr *nest;
5674 int err;
5675
5676 nest = nla_nest_start(skb, attr);
5677 if (nest == NULL)
5678 return -1;
5679
5680 switch (type) {
5681 case NFT_DATA_VALUE:
5682 err = nft_value_dump(skb, data, len);
5683 break;
5684 case NFT_DATA_VERDICT:
33d5a7b1 5685 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5686 break;
5687 default:
5688 err = -EINVAL;
5689 WARN_ON(1);
5690 }
5691
5692 nla_nest_end(skb, nest);
5693 return err;
5694}
5695EXPORT_SYMBOL_GPL(nft_data_dump);
5696
df05ef87 5697static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5698{
5699 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5700 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5701 net->nft.base_seq = 1;
99633ab2
PNA		 5702 return 0;
5703}
5704
5ebe0b0e
PNA		 5705int __nft_release_basechain(struct nft_ctx *ctx)
5706{
5707 struct nft_rule *rule, *nr;
5708
f323d954 5709 BUG_ON(!nft_is_base_chain(ctx->chain));
5ebe0b0e 5710
82bec71d 5711 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 5712 ctx->afi->nops);
5713 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5714 list_del(&rule->list);
5715 ctx->chain->use--;
5716 nf_tables_rule_destroy(ctx, rule);
5717 }
5718 list_del(&ctx->chain->list);
5719 ctx->table->use--;
5720 nf_tables_chain_destroy(ctx->chain);
5721
5722 return 0;
5723}
5724EXPORT_SYMBOL_GPL(__nft_release_basechain);
5725
df05ef87
PNA		 5726/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5727static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5728{
5729 struct nft_table *table, *nt;
5730 struct nft_chain *chain, *nc;
e5009240 5731 struct nft_object *obj, *ne;
df05ef87
PNA		 5732 struct nft_rule *rule, *nr;
5733 struct nft_set *set, *ns;
5734 struct nft_ctx ctx = {
5735 .net = net,
5736 .afi = afi,
5737 };
5738
5739 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5740 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 5741 nf_tables_unregister_hooks(net, table, chain,
5742 afi->nops);
df05ef87
PNA		 5743 /* No packets are walking on these chains anymore. */
5744 ctx.table = table;
5745 list_for_each_entry(chain, &table->chains, list) {
5746 ctx.chain = chain;
5747 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5748 list_del(&rule->list);
5749 chain->use--;
5750 nf_tables_rule_destroy(&ctx, rule);
5751 }
5752 }
5753 list_for_each_entry_safe(set, ns, &table->sets, list) {
5754 list_del(&set->list);
5755 table->use--;
5756 nft_set_destroy(set);
5757 }
e5009240
PNA		 5758 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5759 list_del(&obj->list);
5760 table->use--;
5761 nft_obj_destroy(obj);
5762 }
df05ef87
PNA		 5763 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5764 list_del(&chain->list);
5765 table->use--;
5766 nf_tables_chain_destroy(chain);
5767 }
5768 list_del(&table->list);
5769 nf_tables_table_destroy(&ctx);
5770 }
5771}
5772
99633ab2
PNA		 5773static struct pernet_operations nf_tables_net_ops = {
5774 .init = nf_tables_init_net,
5775};
5776
96518518
PM		 5777static int __init nf_tables_module_init(void)
5778{
5779 int err;
5780
5781 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5782 GFP_KERNEL);
5783 if (info == NULL) {
5784 err = -ENOMEM;
5785 goto err1;
5786 }
5787
5788 err = nf_tables_core_module_init();
5789 if (err < 0)
5790 goto err2;
5791
5792 err = nfnetlink_subsys_register(&nf_tables_subsys);
5793 if (err < 0)
5794 goto err3;
5795
5796 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5797 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5798err3:
5799 nf_tables_core_module_exit();
5800err2:
5801 kfree(info);
5802err1:
5803 return err;
5804}
5805
5806static void __exit nf_tables_module_exit(void)
5807{
99633ab2 5808 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5809 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5810 rcu_barrier();
96518518
PM		 5811 nf_tables_core_module_exit();
5812 kfree(info);
5813}
5814
5815module_init(nf_tables_module_init);
5816module_exit(nf_tables_module_exit);
5817
5818MODULE_LICENSE("GPL");
5819MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5820MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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