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netfilter: nf_tables: add nf_tables_updchain()
[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
2c4a488a
PNA		 1338static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1339 bool create)
1340{
1341 const struct nlattr * const *nla = ctx->nla;
1342 struct nft_table *table = ctx->table;
1343 struct nft_chain *chain = ctx->chain;
1344 struct nft_af_info *afi = ctx->afi;
1345 struct nft_base_chain *basechain;
1346 struct nft_stats *stats = NULL;
1347 struct nft_chain_hook hook;
1348 const struct nlattr *name;
1349 struct nf_hook_ops *ops;
1350 struct nft_trans *trans;
1351 int err, i;
1352
1353 if (nla[NFTA_CHAIN_HOOK]) {
1354 if (!nft_is_base_chain(chain))
1355 return -EBUSY;
1356
1357 err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,
1358 create);
1359 if (err < 0)
1360 return err;
1361
1362 basechain = nft_base_chain(chain);
1363 if (basechain->type != hook.type) {
1364 nft_chain_release_hook(&hook);
1365 return -EBUSY;
1366 }
1367
1368 for (i = 0; i < afi->nops; i++) {
1369 ops = &basechain->ops[i];
1370 if (ops->hooknum != hook.num ||
1371 ops->priority != hook.priority ||
1372 ops->dev != hook.dev) {
1373 nft_chain_release_hook(&hook);
1374 return -EBUSY;
1375 }
1376 }
1377 nft_chain_release_hook(&hook);
1378 }
1379
1380 if (nla[NFTA_CHAIN_HANDLE] &&
1381 nla[NFTA_CHAIN_NAME]) {
1382 struct nft_chain *chain2;
1383
1384 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1385 genmask);
1386 if (IS_ERR(chain2))
1387 return PTR_ERR(chain2);
1388 }
1389
1390 if (nla[NFTA_CHAIN_COUNTERS]) {
1391 if (!nft_is_base_chain(chain))
1392 return -EOPNOTSUPP;
1393
1394 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1395 if (IS_ERR(stats))
1396 return PTR_ERR(stats);
1397 }
1398
1399 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1400 sizeof(struct nft_trans_chain));
1401 if (trans == NULL) {
1402 free_percpu(stats);
1403 return -ENOMEM;
1404 }
1405
1406 nft_trans_chain_stats(trans) = stats;
1407 nft_trans_chain_update(trans) = true;
1408
1409 if (nla[NFTA_CHAIN_POLICY])
1410 nft_trans_chain_policy(trans) = policy;
1411 else
1412 nft_trans_chain_policy(trans) = -1;
1413
1414 name = nla[NFTA_CHAIN_NAME];
1415 if (nla[NFTA_CHAIN_HANDLE] && name) {
1416 nft_trans_chain_name(trans) =
1417 nla_strdup(name, GFP_KERNEL);
1418 if (!nft_trans_chain_name(trans)) {
1419 kfree(trans);
1420 free_percpu(stats);
1421 return -ENOMEM;
1422 }
1423 }
1424 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1425
1426 return 0;
1427}
1428
633c9a84
PNA		 1429static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1430 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1431 const struct nlattr * const nla[],
1432 struct netlink_ext_ack *extack)
96518518
PM		 1433{
1434 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1435 const struct nlattr * uninitialized_var(name);
7c95f6d8 1436 struct nft_af_info *afi;
96518518
PM		 1437 struct nft_table *table;
1438 struct nft_chain *chain;
0ca743a5 1439 struct nft_base_chain *basechain = NULL;
f2a6d766 1440 u8 genmask = nft_genmask_next(net);
96518518 1441 int family = nfmsg->nfgen_family;
57de2a0c 1442 u8 policy = NF_ACCEPT;
96518518 1443 u64 handle = 0;
115a60b1 1444 unsigned int i;
ff3cd7b3 1445 struct nft_stats __percpu *stats;
96518518
PM		 1446 int err;
1447 bool create;
91c7b38d 1448 struct nft_ctx ctx;
96518518
PM		 1449
1450 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1451
99633ab2 1452 afi = nf_tables_afinfo_lookup(net, family, true);
96518518
PM		 1453 if (IS_ERR(afi))
1454 return PTR_ERR(afi);
1455
f2a6d766 1456 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1457 if (IS_ERR(table))
1458 return PTR_ERR(table);
1459
96518518
PM		 1460 chain = NULL;
1461 name = nla[NFTA_CHAIN_NAME];
1462
1463 if (nla[NFTA_CHAIN_HANDLE]) {
1464 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
664b0f8c 1465 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
96518518
PM		 1466 if (IS_ERR(chain))
1467 return PTR_ERR(chain);
1468 } else {
664b0f8c 1469 chain = nf_tables_chain_lookup(table, name, genmask);
96518518
PM		 1470 if (IS_ERR(chain)) {
1471 if (PTR_ERR(chain) != -ENOENT)
1472 return PTR_ERR(chain);
1473 chain = NULL;
1474 }
1475 }
1476
57de2a0c 1477 if (nla[NFTA_CHAIN_POLICY]) {
f323d954
PNA		 1478 if (chain != NULL &&
1479 !nft_is_base_chain(chain))
d6b6cb1d
PNA		 1480 return -EOPNOTSUPP;
1481
1482 if (chain == NULL &&
57de2a0c
PM		 1483 nla[NFTA_CHAIN_HOOK] == NULL)
1484 return -EOPNOTSUPP;
1485
8f46df18 1486 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1487 switch (policy) {
1488 case NF_DROP:
1489 case NF_ACCEPT:
1490 break;
1491 default:
1492 return -EINVAL;
1493 }
1494 }
1495
96518518
PM		 1496 if (chain != NULL) {
1497 if (nlh->nlmsg_flags & NLM_F_EXCL)
1498 return -EEXIST;
1499 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1500 return -EOPNOTSUPP;
1501
633c9a84 1502 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
4401a862 1503
2c4a488a 1504 return nf_tables_updchain(&ctx, genmask, policy, create);
96518518
PM		 1505 }
1506
75820676
PM		 1507 if (table->use == UINT_MAX)
1508 return -EOVERFLOW;
1509
96518518 1510 if (nla[NFTA_CHAIN_HOOK]) {
508f8ccd 1511 struct nft_chain_hook hook;
96518518 1512 struct nf_hook_ops *ops;
9370761c 1513 nf_hookfn *hookfn;
96518518 1514
508f8ccd 1515 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
96518518
PM		 1516 if (err < 0)
1517 return err;
2cbce139 1518
96518518 1519 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
f5553c19 1520 if (basechain == NULL) {
508f8ccd 1521 nft_chain_release_hook(&hook);
96518518 1522 return -ENOMEM;
f5553c19 1523 }
9370761c 1524
508f8ccd
PNA		 1525 if (hook.dev != NULL)
1526 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
2cbce139 1527
4401a862 1528 if (nla[NFTA_CHAIN_COUNTERS]) {
ff3cd7b3
PNA		 1529 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1530 if (IS_ERR(stats)) {
508f8ccd 1531 nft_chain_release_hook(&hook);
4401a862 1532 kfree(basechain);
ff3cd7b3 1533 return PTR_ERR(stats);
4401a862 1534 }
ff3cd7b3 1535 basechain->stats = stats;
9f08ea84 1536 static_branch_inc(&nft_counters_enabled);
4401a862
PM		 1537 }
1538
508f8ccd
PNA		 1539 hookfn = hook.type->hooks[hook.num];
1540 basechain->type = hook.type;
96518518
PM		 1541 chain = &basechain->chain;
1542
115a60b1
PM		 1543 for (i = 0; i < afi->nops; i++) {
1544 ops = &basechain->ops[i];
1545 ops->pf = family;
508f8ccd
PNA		 1546 ops->hooknum = hook.num;
1547 ops->priority = hook.priority;
115a60b1
PM		 1548 ops->priv = chain;
1549 ops->hook = afi->hooks[ops->hooknum];
508f8ccd 1550 ops->dev = hook.dev;
115a60b1
PM		 1551 if (hookfn)
1552 ops->hook = hookfn;
1553 if (afi->hook_ops_init)
1554 afi->hook_ops_init(ops, i);
1555 }
96518518
PM		 1556
1557 chain->flags |= NFT_BASE_CHAIN;
57de2a0c 1558 basechain->policy = policy;
96518518
PM		 1559 } else {
1560 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1561 if (chain == NULL)
1562 return -ENOMEM;
1563 }
1564
1565 INIT_LIST_HEAD(&chain->rules);
1566 chain->handle = nf_tables_alloc_handle(table);
b5bc89bf 1567 chain->table = table;
b7263e07
PS		 1568 chain->name = nla_strdup(name, GFP_KERNEL);
1569 if (!chain->name) {
1570 err = -ENOMEM;
1571 goto err1;
1572 }
96518518 1573
82bec71d 1574 err = nf_tables_register_hooks(net, table, chain, afi->nops);
d8ee8f7c
PNA		 1575 if (err < 0)
1576 goto err1;
96518518 1577
633c9a84 1578 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
91c7b38d
PNA		 1579 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1580 if (err < 0)
1581 goto err2;
96518518 1582
4fefee57 1583 table->use++;
e688a7f8 1584 list_add_tail_rcu(&chain->list, &table->chains);
91c7b38d
PNA		 1585 return 0;
1586err2:
82bec71d 1587 nf_tables_unregister_hooks(net, table, chain, afi->nops);
91c7b38d
PNA		 1588err1:
1589 nf_tables_chain_destroy(chain);
1590 return err;
96518518
PM		 1591}
1592
633c9a84
PNA		 1593static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1594 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1595 const struct nlattr * const nla[],
1596 struct netlink_ext_ack *extack)
96518518
PM		 1597{
1598 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1599 u8 genmask = nft_genmask_next(net);
7c95f6d8 1600 struct nft_af_info *afi;
96518518
PM		 1601 struct nft_table *table;
1602 struct nft_chain *chain;
1603 int family = nfmsg->nfgen_family;
91c7b38d 1604 struct nft_ctx ctx;
96518518 1605
99633ab2 1606 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 1607 if (IS_ERR(afi))
1608 return PTR_ERR(afi);
1609
f2a6d766 1610 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
96518518
PM		 1611 if (IS_ERR(table))
1612 return PTR_ERR(table);
1613
664b0f8c 1614 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
96518518
PM		 1615 if (IS_ERR(chain))
1616 return PTR_ERR(chain);
4fefee57 1617 if (chain->use > 0)
96518518
PM		 1618 return -EBUSY;
1619
633c9a84 1620 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0165d932 1621
ee01d542 1622 return nft_delchain(&ctx);
96518518
PM		 1623}
1624
96518518
PM		 1625/*
1626 * Expressions
1627 */
1628
1629/**
ef1f7df9
PM		 1630 * nft_register_expr - register nf_tables expr type
1631 * @ops: expr type
96518518 1632 *
ef1f7df9 1633 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1634 * success or a negative errno code otherwise.
1635 */
ef1f7df9 1636int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 1637{
1638 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1639 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1640 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1641 else
e688a7f8 1642 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1643 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1644 return 0;
1645}
1646EXPORT_SYMBOL_GPL(nft_register_expr);
1647
1648/**
ef1f7df9
PM		 1649 * nft_unregister_expr - unregister nf_tables expr type
1650 * @ops: expr type
96518518 1651 *
ef1f7df9 1652 * Unregisters the expr typefor use with nf_tables.
96518518 1653 */
ef1f7df9 1654void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1655{
1656 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1657 list_del_rcu(&type->list);
96518518
PM		 1658 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1659}
1660EXPORT_SYMBOL_GPL(nft_unregister_expr);
1661
64d46806
PM		 1662static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1663 struct nlattr *nla)
96518518 1664{
ef1f7df9 1665 const struct nft_expr_type *type;
96518518 1666
ef1f7df9 1667 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1668 if (!nla_strcmp(nla, type->name) &&
1669 (!type->family || type->family == family))
ef1f7df9 1670 return type;
96518518
PM		 1671 }
1672 return NULL;
1673}
1674
64d46806
PM		 1675static const struct nft_expr_type *nft_expr_type_get(u8 family,
1676 struct nlattr *nla)
96518518 1677{
ef1f7df9 1678 const struct nft_expr_type *type;
96518518
PM		 1679
1680 if (nla == NULL)
1681 return ERR_PTR(-EINVAL);
1682
64d46806 1683 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1684 if (type != NULL && try_module_get(type->owner))
1685 return type;
96518518
PM		 1686
1687#ifdef CONFIG_MODULES
ef1f7df9 1688 if (type == NULL) {
64d46806
PM		 1689 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1690 request_module("nft-expr-%u-%.*s", family,
1691 nla_len(nla), (char *)nla_data(nla));
1692 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1693 if (__nft_expr_type_get(family, nla))
1694 return ERR_PTR(-EAGAIN);
1695
96518518
PM		 1696 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1697 request_module("nft-expr-%.*s",
1698 nla_len(nla), (char *)nla_data(nla));
1699 nfnl_lock(NFNL_SUBSYS_NFTABLES);
64d46806 1700 if (__nft_expr_type_get(family, nla))
96518518
PM		 1701 return ERR_PTR(-EAGAIN);
1702 }
1703#endif
1704 return ERR_PTR(-ENOENT);
1705}
1706
1707static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1708 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1709 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1710};
1711
1712static int nf_tables_fill_expr_info(struct sk_buff *skb,
1713 const struct nft_expr *expr)
1714{
ef1f7df9 1715 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 1716 goto nla_put_failure;
1717
1718 if (expr->ops->dump) {
1719 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1720 if (data == NULL)
1721 goto nla_put_failure;
1722 if (expr->ops->dump(skb, expr) < 0)
1723 goto nla_put_failure;
1724 nla_nest_end(skb, data);
1725 }
1726
1727 return skb->len;
1728
1729nla_put_failure:
1730 return -1;
1731};
1732
0b2d8a7b
PM		 1733int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1734 const struct nft_expr *expr)
1735{
1736 struct nlattr *nest;
1737
1738 nest = nla_nest_start(skb, attr);
1739 if (!nest)
1740 goto nla_put_failure;
1741 if (nf_tables_fill_expr_info(skb, expr) < 0)
1742 goto nla_put_failure;
1743 nla_nest_end(skb, nest);
1744 return 0;
1745
1746nla_put_failure:
1747 return -1;
1748}
1749
96518518
PM		 1750struct nft_expr_info {
1751 const struct nft_expr_ops *ops;
ef1f7df9 1752 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 1753};
1754
0ca743a5
PNA		 1755static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1756 const struct nlattr *nla,
96518518
PM		 1757 struct nft_expr_info *info)
1758{
ef1f7df9 1759 const struct nft_expr_type *type;
96518518 1760 const struct nft_expr_ops *ops;
ef1f7df9 1761 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 1762 int err;
1763
fceb6435 1764 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
96518518
PM		 1765 if (err < 0)
1766 return err;
1767
64d46806 1768 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 1769 if (IS_ERR(type))
1770 return PTR_ERR(type);
1771
1772 if (tb[NFTA_EXPR_DATA]) {
1773 err = nla_parse_nested(info->tb, type->maxattr,
fceb6435 1774 tb[NFTA_EXPR_DATA], type->policy, NULL);
ef1f7df9
PM		 1775 if (err < 0)
1776 goto err1;
1777 } else
1778 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1779
1780 if (type->select_ops != NULL) {
0ca743a5
PNA		 1781 ops = type->select_ops(ctx,
1782 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 1783 if (IS_ERR(ops)) {
1784 err = PTR_ERR(ops);
1785 goto err1;
1786 }
1787 } else
1788 ops = type->ops;
1789
96518518
PM		 1790 info->ops = ops;
1791 return 0;
ef1f7df9
PM		 1792
1793err1:
1794 module_put(type->owner);
1795 return err;
96518518
PM		 1796}
1797
1798static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 1799 const struct nft_expr_info *info,
96518518
PM		 1800 struct nft_expr *expr)
1801{
1802 const struct nft_expr_ops *ops = info->ops;
1803 int err;
1804
1805 expr->ops = ops;
1806 if (ops->init) {
ef1f7df9 1807 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 1808 if (err < 0)
1809 goto err1;
1810 }
1811
c56e3956
LZ		 1812 if (ops->validate) {
1813 const struct nft_data *data = NULL;
1814
1815 err = ops->validate(ctx, expr, &data);
1816 if (err < 0)
1817 goto err2;
1818 }
1819
96518518
PM		 1820 return 0;
1821
c56e3956
LZ		 1822err2:
1823 if (ops->destroy)
1824 ops->destroy(ctx, expr);
96518518
PM		 1825err1:
1826 expr->ops = NULL;
1827 return err;
1828}
1829
62472bce
PM		 1830static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1831 struct nft_expr *expr)
96518518
PM		 1832{
1833 if (expr->ops->destroy)
62472bce 1834 expr->ops->destroy(ctx, expr);
ef1f7df9 1835 module_put(expr->ops->type->owner);
96518518
PM		 1836}
1837
0b2d8a7b
PM		 1838struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1839 const struct nlattr *nla)
1840{
1841 struct nft_expr_info info;
1842 struct nft_expr *expr;
1843 int err;
1844
1845 err = nf_tables_expr_parse(ctx, nla, &info);
1846 if (err < 0)
1847 goto err1;
1848
1849 err = -ENOMEM;
1850 expr = kzalloc(info.ops->size, GFP_KERNEL);
1851 if (expr == NULL)
1852 goto err2;
1853
1854 err = nf_tables_newexpr(ctx, &info, expr);
1855 if (err < 0)
6cafaf47 1856 goto err3;
0b2d8a7b
PM		 1857
1858 return expr;
6cafaf47
LZ		 1859err3:
1860 kfree(expr);
0b2d8a7b
PM		 1861err2:
1862 module_put(info.ops->type->owner);
1863err1:
1864 return ERR_PTR(err);
1865}
1866
1867void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1868{
1869 nf_tables_expr_destroy(ctx, expr);
1870 kfree(expr);
1871}
1872
96518518
PM		 1873/*
1874 * Rules
1875 */
1876
1877static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1878 u64 handle)
1879{
1880 struct nft_rule *rule;
1881
1882 // FIXME: this sucks
1883 list_for_each_entry(rule, &chain->rules, list) {
1884 if (handle == rule->handle)
1885 return rule;
1886 }
1887
1888 return ERR_PTR(-ENOENT);
1889}
1890
1891static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1892 const struct nlattr *nla)
1893{
1894 if (nla == NULL)
1895 return ERR_PTR(-EINVAL);
1896
1897 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1898}
1899
1900static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 1901 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1902 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1903 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1904 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1905 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1906 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 1907 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 1908 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 1909 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1910 .len = NFT_USERDATA_MAXLEN },
96518518
PM		 1911};
1912
84d7fce6
PNA		 1913static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1914 u32 portid, u32 seq, int event,
1915 u32 flags, int family,
96518518
PM		 1916 const struct nft_table *table,
1917 const struct nft_chain *chain,
1918 const struct nft_rule *rule)
1919{
1920 struct nlmsghdr *nlh;
1921 struct nfgenmsg *nfmsg;
1922 const struct nft_expr *expr, *next;
1923 struct nlattr *list;
5e948466 1924 const struct nft_rule *prule;
dedb67c4 1925 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 1926
dedb67c4 1927 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 1928 if (nlh == NULL)
1929 goto nla_put_failure;
1930
1931 nfmsg = nlmsg_data(nlh);
1932 nfmsg->nfgen_family = family;
1933 nfmsg->version = NFNETLINK_V0;
84d7fce6 1934 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1935
1936 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1937 goto nla_put_failure;
1938 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1939 goto nla_put_failure;
b46f6ded
ND		 1940 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
1941 NFTA_RULE_PAD))
96518518
PM		 1942 goto nla_put_failure;
1943
5e948466 1944 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 1945 prule = list_prev_entry(rule, list);
5e948466 1946 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 1947 cpu_to_be64(prule->handle),
1948 NFTA_RULE_PAD))
5e948466
EL		 1949 goto nla_put_failure;
1950 }
1951
96518518
PM		 1952 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1953 if (list == NULL)
1954 goto nla_put_failure;
1955 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 1956 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 1957 goto nla_put_failure;
96518518
PM		 1958 }
1959 nla_nest_end(skb, list);
1960
86f1ec32
PM		 1961 if (rule->udata) {
1962 struct nft_userdata *udata = nft_userdata(rule);
1963 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
1964 udata->data) < 0)
1965 goto nla_put_failure;
1966 }
0768b3b3 1967
053c095a
JB		 1968 nlmsg_end(skb, nlh);
1969 return 0;
96518518
PM		 1970
1971nla_put_failure:
1972 nlmsg_trim(skb, nlh);
1973 return -1;
1974}
1975
25e94a99
PNA		 1976static void nf_tables_rule_notify(const struct nft_ctx *ctx,
1977 const struct nft_rule *rule, int event)
96518518
PM		 1978{
1979 struct sk_buff *skb;
96518518
PM		 1980 int err;
1981
128ad332
PNA		 1982 if (!ctx->report &&
1983 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1984 return;
96518518 1985
96518518
PM		 1986 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1987 if (skb == NULL)
1988 goto err;
1989
84d7fce6
PNA		 1990 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
1991 event, 0, ctx->afi->family, ctx->table,
35151d84 1992 ctx->chain, rule);
96518518
PM		 1993 if (err < 0) {
1994 kfree_skb(skb);
1995 goto err;
1996 }
1997
25e94a99
PNA		 1998 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1999 ctx->report, GFP_KERNEL);
2000 return;
96518518 2001err:
25e94a99 2002 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2003}
2004
6e1f760e 2005struct nft_rule_dump_ctx {
e46abbcc 2006 char *table;
b7263e07 2007 char *chain;
6e1f760e
PNA		 2008};
2009
96518518
PM		 2010static int nf_tables_dump_rules(struct sk_buff *skb,
2011 struct netlink_callback *cb)
2012{
2013 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2014 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 2015 const struct nft_af_info *afi;
2016 const struct nft_table *table;
2017 const struct nft_chain *chain;
2018 const struct nft_rule *rule;
2019 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 2020 struct net *net = sock_net(skb->sk);
96518518
PM		 2021 int family = nfmsg->nfgen_family;
2022
e688a7f8 2023 rcu_read_lock();
38e029f1
PNA		 2024 cb->seq = net->nft.base_seq;
2025
e688a7f8 2026 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
96518518
PM		 2027 if (family != NFPROTO_UNSPEC && family != afi->family)
2028 continue;
2029
e688a7f8 2030 list_for_each_entry_rcu(table, &afi->tables, list) {
e46abbcc 2031 if (ctx && ctx->table &&
6e1f760e
PNA		 2032 strcmp(ctx->table, table->name) != 0)
2033 continue;
2034
e688a7f8 2035 list_for_each_entry_rcu(chain, &table->chains, list) {
6e1f760e
PNA		 2036 if (ctx && ctx->chain[0] &&
2037 strcmp(ctx->chain, chain->name) != 0)
2038 continue;
2039
e688a7f8 2040 list_for_each_entry_rcu(rule, &chain->rules, list) {
889f7ee7 2041 if (!nft_is_active(net, rule))
0628b123 2042 goto cont;
96518518
PM		 2043 if (idx < s_idx)
2044 goto cont;
2045 if (idx > s_idx)
2046 memset(&cb->args[1], 0,
2047 sizeof(cb->args) - sizeof(cb->args[0]));
84d7fce6 2048 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
96518518
PM		 2049 cb->nlh->nlmsg_seq,
2050 NFT_MSG_NEWRULE,
2051 NLM_F_MULTI | NLM_F_APPEND,
2052 afi->family, table, chain, rule) < 0)
2053 goto done;
38e029f1
PNA		 2054
2055 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518
PM		 2056cont:
2057 idx++;
2058 }
2059 }
2060 }
2061 }
2062done:
e688a7f8
PNA		 2063 rcu_read_unlock();
2064
96518518
PM		 2065 cb->args[0] = idx;
2066 return skb->len;
2067}
2068
6e1f760e
PNA		 2069static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2070{
e46abbcc
PS		 2071 struct nft_rule_dump_ctx *ctx = cb->data;
2072
2073 if (ctx) {
2074 kfree(ctx->table);
b7263e07 2075 kfree(ctx->chain);
e46abbcc
PS		 2076 kfree(ctx);
2077 }
6e1f760e
PNA		 2078 return 0;
2079}
2080
7b8002a1
PNA		 2081static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2082 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2083 const struct nlattr * const nla[],
2084 struct netlink_ext_ack *extack)
96518518
PM		 2085{
2086 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2087 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2088 const struct nft_af_info *afi;
2089 const struct nft_table *table;
2090 const struct nft_chain *chain;
2091 const struct nft_rule *rule;
2092 struct sk_buff *skb2;
2093 int family = nfmsg->nfgen_family;
2094 int err;
2095
2096 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2097 struct netlink_dump_control c = {
2098 .dump = nf_tables_dump_rules,
6e1f760e 2099 .done = nf_tables_dump_rules_done,
96518518 2100 };
6e1f760e
PNA		 2101
2102 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2103 struct nft_rule_dump_ctx *ctx;
2104
2105 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2106 if (!ctx)
2107 return -ENOMEM;
2108
e46abbcc
PS		 2109 if (nla[NFTA_RULE_TABLE]) {
2110 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2111 GFP_KERNEL);
2112 if (!ctx->table) {
2113 kfree(ctx);
2114 return -ENOMEM;
2115 }
2116 }
b7263e07
PS		 2117 if (nla[NFTA_RULE_CHAIN]) {
2118 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2119 GFP_KERNEL);
2120 if (!ctx->chain) {
2121 kfree(ctx->table);
2122 kfree(ctx);
2123 return -ENOMEM;
2124 }
2125 }
6e1f760e
PNA		 2126 c.data = ctx;
2127 }
2128
96518518
PM		 2129 return netlink_dump_start(nlsk, skb, nlh, &c);
2130 }
2131
99633ab2 2132 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2133 if (IS_ERR(afi))
2134 return PTR_ERR(afi);
2135
f2a6d766 2136 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2137 if (IS_ERR(table))
2138 return PTR_ERR(table);
2139
664b0f8c 2140 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2141 if (IS_ERR(chain))
2142 return PTR_ERR(chain);
2143
2144 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2145 if (IS_ERR(rule))
2146 return PTR_ERR(rule);
2147
2148 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2149 if (!skb2)
2150 return -ENOMEM;
2151
84d7fce6 2152 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2153 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2154 family, table, chain, rule);
2155 if (err < 0)
2156 goto err;
2157
2158 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2159
2160err:
2161 kfree_skb(skb2);
2162 return err;
2163}
2164
62472bce
PM		 2165static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2166 struct nft_rule *rule)
96518518 2167{
96518518
PM		 2168 struct nft_expr *expr;
2169
2170 /*
2171 * Careful: some expressions might not be initialized in case this
2172 * is called on error from nf_tables_newrule().
2173 */
2174 expr = nft_expr_first(rule);
3e38df13 2175 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2176 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2177 expr = nft_expr_next(expr);
2178 }
2179 kfree(rule);
2180}
2181
1081d11b
PNA		 2182#define NFT_RULE_MAXEXPRS 128
2183
2184static struct nft_expr_info *info;
2185
633c9a84
PNA		 2186static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2187 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2188 const struct nlattr * const nla[],
2189 struct netlink_ext_ack *extack)
96518518
PM		 2190{
2191 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2192 u8 genmask = nft_genmask_next(net);
7c95f6d8 2193 struct nft_af_info *afi;
96518518
PM		 2194 struct nft_table *table;
2195 struct nft_chain *chain;
2196 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2197 struct nft_userdata *udata;
1081d11b 2198 struct nft_trans *trans = NULL;
96518518
PM		 2199 struct nft_expr *expr;
2200 struct nft_ctx ctx;
2201 struct nlattr *tmp;
86f1ec32 2202 unsigned int size, i, n, ulen = 0, usize = 0;
96518518
PM		 2203 int err, rem;
2204 bool create;
5e948466 2205 u64 handle, pos_handle;
96518518
PM		 2206
2207 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2208
99633ab2 2209 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
96518518
PM		 2210 if (IS_ERR(afi))
2211 return PTR_ERR(afi);
2212
f2a6d766 2213 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2214 if (IS_ERR(table))
2215 return PTR_ERR(table);
2216
664b0f8c 2217 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
96518518
PM		 2218 if (IS_ERR(chain))
2219 return PTR_ERR(chain);
2220
2221 if (nla[NFTA_RULE_HANDLE]) {
2222 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2223 rule = __nf_tables_rule_lookup(chain, handle);
2224 if (IS_ERR(rule))
2225 return PTR_ERR(rule);
2226
2227 if (nlh->nlmsg_flags & NLM_F_EXCL)
2228 return -EEXIST;
2229 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2230 old_rule = rule;
2231 else
2232 return -EOPNOTSUPP;
2233 } else {
2234 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2235 return -EINVAL;
2236 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2237
2238 if (chain->use == UINT_MAX)
2239 return -EOVERFLOW;
96518518
PM		 2240 }
2241
5e948466
EL		 2242 if (nla[NFTA_RULE_POSITION]) {
2243 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2244 return -EOPNOTSUPP;
2245
2246 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2247 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2248 if (IS_ERR(old_rule))
2249 return PTR_ERR(old_rule);
2250 }
2251
633c9a84 2252 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0ca743a5 2253
96518518
PM		 2254 n = 0;
2255 size = 0;
2256 if (nla[NFTA_RULE_EXPRESSIONS]) {
2257 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2258 err = -EINVAL;
2259 if (nla_type(tmp) != NFTA_LIST_ELEM)
2260 goto err1;
2261 if (n == NFT_RULE_MAXEXPRS)
2262 goto err1;
0ca743a5 2263 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2264 if (err < 0)
2265 goto err1;
2266 size += info[n].ops->size;
2267 n++;
2268 }
2269 }
9889840f
PM		 2270 /* Check for overflow of dlen field */
2271 err = -EFBIG;
2272 if (size >= 1 << 12)
2273 goto err1;
96518518 2274
86f1ec32 2275 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2276 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2277 if (ulen > 0)
2278 usize = sizeof(struct nft_userdata) + ulen;
2279 }
0768b3b3 2280
96518518 2281 err = -ENOMEM;
86f1ec32 2282 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2283 if (rule == NULL)
2284 goto err1;
2285
889f7ee7 2286 nft_activate_next(net, rule);
0628b123 2287
96518518
PM		 2288 rule->handle = handle;
2289 rule->dlen = size;
86f1ec32 2290 rule->udata = ulen ? 1 : 0;
0768b3b3 2291
86f1ec32
PM		 2292 if (ulen) {
2293 udata = nft_userdata(rule);
2294 udata->len = ulen - 1;
2295 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2296 }
96518518 2297
96518518
PM		 2298 expr = nft_expr_first(rule);
2299 for (i = 0; i < n; i++) {
2300 err = nf_tables_newexpr(&ctx, &info[i], expr);
2301 if (err < 0)
2302 goto err2;
ef1f7df9 2303 info[i].ops = NULL;
96518518
PM		 2304 expr = nft_expr_next(expr);
2305 }
2306
96518518 2307 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
889f7ee7 2308 if (nft_is_active_next(net, old_rule)) {
ac904ac8 2309 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
b380e5c7 2310 old_rule);
1081d11b 2311 if (trans == NULL) {
0628b123
PNA		 2312 err = -ENOMEM;
2313 goto err2;
2314 }
889f7ee7 2315 nft_deactivate_next(net, old_rule);
ac34b861 2316 chain->use--;
5bc5c307 2317 list_add_tail_rcu(&rule->list, &old_rule->list);
0628b123
PNA		 2318 } else {
2319 err = -ENOENT;
2320 goto err2;
2321 }
96518518 2322 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
5e948466
EL		 2323 if (old_rule)
2324 list_add_rcu(&rule->list, &old_rule->list);
2325 else
2326 list_add_tail_rcu(&rule->list, &chain->rules);
2327 else {
2328 if (old_rule)
2329 list_add_tail_rcu(&rule->list, &old_rule->list);
2330 else
2331 list_add_rcu(&rule->list, &chain->rules);
2332 }
96518518 2333
b380e5c7 2334 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
0628b123
PNA		 2335 err = -ENOMEM;
2336 goto err3;
2337 }
4fefee57 2338 chain->use++;
96518518
PM		 2339 return 0;
2340
0628b123
PNA		 2341err3:
2342 list_del_rcu(&rule->list);
96518518 2343err2:
62472bce 2344 nf_tables_rule_destroy(&ctx, rule);
96518518
PM		 2345err1:
2346 for (i = 0; i < n; i++) {
2347 if (info[i].ops != NULL)
ef1f7df9 2348 module_put(info[i].ops->type->owner);
96518518
PM		 2349 }
2350 return err;
2351}
2352
1a94e38d
PNA		 2353static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2354 const struct nlattr *nla)
2355{
2356 u32 id = ntohl(nla_get_be32(nla));
2357 struct nft_trans *trans;
2358
2359 list_for_each_entry(trans, &net->nft.commit_list, list) {
2360 struct nft_rule *rule = nft_trans_rule(trans);
2361
2362 if (trans->msg_type == NFT_MSG_NEWRULE &&
2363 id == nft_trans_rule_id(trans))
2364 return rule;
2365 }
2366 return ERR_PTR(-ENOENT);
2367}
2368
633c9a84
PNA		 2369static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2370 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2371 const struct nlattr * const nla[],
2372 struct netlink_ext_ack *extack)
96518518
PM		 2373{
2374 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2375 u8 genmask = nft_genmask_next(net);
7c95f6d8 2376 struct nft_af_info *afi;
7c95f6d8 2377 struct nft_table *table;
cf9dc09d
PNA		 2378 struct nft_chain *chain = NULL;
2379 struct nft_rule *rule;
0628b123
PNA		 2380 int family = nfmsg->nfgen_family, err = 0;
2381 struct nft_ctx ctx;
96518518 2382
99633ab2 2383 afi = nf_tables_afinfo_lookup(net, family, false);
96518518
PM		 2384 if (IS_ERR(afi))
2385 return PTR_ERR(afi);
2386
f2a6d766 2387 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
96518518
PM		 2388 if (IS_ERR(table))
2389 return PTR_ERR(table);
2390
cf9dc09d 2391 if (nla[NFTA_RULE_CHAIN]) {
664b0f8c
PNA		 2392 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2393 genmask);
cf9dc09d
PNA		 2394 if (IS_ERR(chain))
2395 return PTR_ERR(chain);
2396 }
96518518 2397
633c9a84 2398 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
0628b123 2399
cf9dc09d
PNA		 2400 if (chain) {
2401 if (nla[NFTA_RULE_HANDLE]) {
2402 rule = nf_tables_rule_lookup(chain,
2403 nla[NFTA_RULE_HANDLE]);
2404 if (IS_ERR(rule))
2405 return PTR_ERR(rule);
96518518 2406
1a94e38d
PNA		 2407 err = nft_delrule(&ctx, rule);
2408 } else if (nla[NFTA_RULE_ID]) {
2409 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2410 if (IS_ERR(rule))
2411 return PTR_ERR(rule);
2412
5e266fe7 2413 err = nft_delrule(&ctx, rule);
cf9dc09d 2414 } else {
ce24b721 2415 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2416 }
2417 } else {
2418 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2419 if (!nft_is_active_next(net, chain))
2420 continue;
2421
cf9dc09d 2422 ctx.chain = chain;
ce24b721 2423 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2424 if (err < 0)
2425 break;
2426 }
2427 }
2428
2429 return err;
2430}
2431
20a69341
PM		 2432/*
2433 * Sets
2434 */
2435
2b664957 2436static LIST_HEAD(nf_tables_set_types);
20a69341 2437
2b664957 2438int nft_register_set(struct nft_set_type *type)
20a69341
PM		 2439{
2440 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2441 list_add_tail_rcu(&type->list, &nf_tables_set_types);
20a69341
PM		 2442 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2443 return 0;
2444}
2445EXPORT_SYMBOL_GPL(nft_register_set);
2446
2b664957 2447void nft_unregister_set(struct nft_set_type *type)
20a69341
PM		 2448{
2449 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2450 list_del_rcu(&type->list);
20a69341
PM		 2451 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2452}
2453EXPORT_SYMBOL_GPL(nft_unregister_set);
2454
2b664957
PNA		 2455#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2456 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2457
2458static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2459{
2460 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2461}
2462
c50b960c
PM		 2463/*
2464 * Select a set implementation based on the data characteristics and the
2465 * given policy. The total memory use might not be known if no size is
2466 * given, in that case the amount of memory per element is used.
2467 */
2468static const struct nft_set_ops *
2b664957
PNA		 2469nft_select_set_ops(const struct nft_ctx *ctx,
2470 const struct nlattr * const nla[],
c50b960c
PM		 2471 const struct nft_set_desc *desc,
2472 enum nft_set_policies policy)
20a69341 2473{
c50b960c
PM		 2474 const struct nft_set_ops *ops, *bops;
2475 struct nft_set_estimate est, best;
2b664957
PNA		 2476 const struct nft_set_type *type;
2477 u32 flags = 0;
20a69341
PM		 2478
2479#ifdef CONFIG_MODULES
2b664957 2480 if (list_empty(&nf_tables_set_types)) {
20a69341
PM		 2481 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2482 request_module("nft-set");
2483 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2484 if (!list_empty(&nf_tables_set_types))
20a69341
PM		 2485 return ERR_PTR(-EAGAIN);
2486 }
2487#endif
2b664957
PNA		 2488 if (nla[NFTA_SET_FLAGS] != NULL)
2489 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 2490
55af753c
PNA		 2491 bops = NULL;
2492 best.size = ~0;
2493 best.lookup = ~0;
0b5a7874 2494 best.space = ~0;
c50b960c 2495
2b664957
PNA		 2496 list_for_each_entry(type, &nf_tables_set_types, list) {
2497 if (!type->select_ops)
2498 ops = type->ops;
2499 else
2500 ops = type->select_ops(ctx, desc, flags);
2501 if (!ops)
2502 continue;
2503
2504 if (!nft_set_ops_candidate(ops, flags))
20a69341 2505 continue;
2b664957 2506 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 2507 continue;
2508
2509 switch (policy) {
2510 case NFT_SET_POL_PERFORMANCE:
55af753c 2511 if (est.lookup < best.lookup)
c50b960c 2512 break;
0b5a7874
PNA		 2513 if (est.lookup == best.lookup) {
2514 if (!desc->size) {
2515 if (est.space < best.space)
2516 break;
2517 } else if (est.size < best.size) {
2518 break;
2519 }
2520 }
c50b960c
PM		 2521 continue;
2522 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2523 if (!desc->size) {
2524 if (est.space < best.space)
2525 break;
2526 if (est.space == best.space &&
2527 est.lookup < best.lookup)
2528 break;
2529 } else if (est.size < best.size) {
c50b960c 2530 break;
0b5a7874 2531 }
c50b960c
PM		 2532 continue;
2533 default:
2534 break;
2535 }
2536
2b664957 2537 if (!try_module_get(type->owner))
20a69341 2538 continue;
c50b960c 2539 if (bops != NULL)
2b664957 2540 module_put(bops->type->owner);
c50b960c
PM		 2541
2542 bops = ops;
2543 best = est;
20a69341
PM		 2544 }
2545
c50b960c
PM		 2546 if (bops != NULL)
2547 return bops;
2548
20a69341
PM		 2549 return ERR_PTR(-EOPNOTSUPP);
2550}
2551
2552static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2553 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2554 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2555 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2556 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2557 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2558 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2559 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2560 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2561 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2562 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2563 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2564 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2565 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2566 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2567 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2568 .len = NFT_USERDATA_MAXLEN },
8aeff920 2569 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
c50b960c
PM		 2570};
2571
2572static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2573 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2574};
2575
633c9a84 2576static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2577 const struct sk_buff *skb,
2578 const struct nlmsghdr *nlh,
f2a6d766
PNA		 2579 const struct nlattr * const nla[],
2580 u8 genmask)
20a69341
PM		 2581{
2582 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 2583 struct nft_af_info *afi = NULL;
2584 struct nft_table *table = NULL;
20a69341 2585
c9c8e485
PNA		 2586 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2587 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2588 if (IS_ERR(afi))
2589 return PTR_ERR(afi);
2590 }
20a69341
PM		 2591
2592 if (nla[NFTA_SET_TABLE] != NULL) {
ec2c9935
PM		 2593 if (afi == NULL)
2594 return -EAFNOSUPPORT;
2595
f2a6d766
PNA		 2596 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2597 genmask);
20a69341
PM		 2598 if (IS_ERR(table))
2599 return PTR_ERR(table);
2600 }
2601
633c9a84 2602 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 2603 return 0;
2604}
2605
c7a72e3f
PNA		 2606static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2607 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2608{
2609 struct nft_set *set;
2610
2611 if (nla == NULL)
2612 return ERR_PTR(-EINVAL);
2613
2614 list_for_each_entry(set, &table->sets, list) {
37a9cc52
PNA		 2615 if (!nla_strcmp(nla, set->name) &&
2616 nft_active_genmask(set, genmask))
20a69341
PM		 2617 return set;
2618 }
2619 return ERR_PTR(-ENOENT);
2620}
2621
c7a72e3f
PNA		 2622static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2623 const struct nlattr *nla,
2624 u8 genmask)
958bee14
PNA		 2625{
2626 struct nft_trans *trans;
2627 u32 id = ntohl(nla_get_be32(nla));
2628
2629 list_for_each_entry(trans, &net->nft.commit_list, list) {
37a9cc52
PNA		 2630 struct nft_set *set = nft_trans_set(trans);
2631
958bee14 2632 if (trans->msg_type == NFT_MSG_NEWSET &&
37a9cc52
PNA		 2633 id == nft_trans_set_id(trans) &&
2634 nft_active_genmask(set, genmask))
2635 return set;
958bee14
PNA		 2636 }
2637 return ERR_PTR(-ENOENT);
2638}
c7a72e3f
PNA		 2639
2640struct nft_set *nft_set_lookup(const struct net *net,
2641 const struct nft_table *table,
2642 const struct nlattr *nla_set_name,
2643 const struct nlattr *nla_set_id,
2644 u8 genmask)
2645{
2646 struct nft_set *set;
2647
2648 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2649 if (IS_ERR(set)) {
2650 if (!nla_set_id)
2651 return set;
2652
2653 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2654 }
2655 return set;
2656}
2657EXPORT_SYMBOL_GPL(nft_set_lookup);
958bee14 2658
20a69341
PM		 2659static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2660 const char *name)
2661{
2662 const struct nft_set *i;
2663 const char *p;
2664 unsigned long *inuse;
60eb1894 2665 unsigned int n = 0, min = 0;
20a69341 2666
38745490 2667 p = strchr(name, '%');
20a69341
PM		 2668 if (p != NULL) {
2669 if (p[1] != 'd' || strchr(p + 2, '%'))
2670 return -EINVAL;
2671
2672 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2673 if (inuse == NULL)
2674 return -ENOMEM;
60eb1894 2675cont:
20a69341 2676 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 2677 int tmp;
2678
37a9cc52
PNA		 2679 if (!nft_is_active_next(ctx->net, set))
2680 continue;
14662917 2681 if (!sscanf(i->name, name, &tmp))
20a69341 2682 continue;
60eb1894 2683 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 2684 continue;
14662917 2685
60eb1894 2686 set_bit(tmp - min, inuse);
20a69341
PM		 2687 }
2688
53b70287 2689 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 2690 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2691 min += BITS_PER_BYTE * PAGE_SIZE;
2692 memset(inuse, 0, PAGE_SIZE);
2693 goto cont;
2694 }
20a69341
PM		 2695 free_page((unsigned long)inuse);
2696 }
2697
38745490
PS		 2698 set->name = kasprintf(GFP_KERNEL, name, min + n);
2699 if (!set->name)
2700 return -ENOMEM;
2701
20a69341 2702 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 2703 if (!nft_is_active_next(ctx->net, i))
2704 continue;
20a69341
PM		 2705 if (!strcmp(set->name, i->name))
2706 return -ENFILE;
2707 }
2708 return 0;
2709}
2710
2711static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2712 const struct nft_set *set, u16 event, u16 flags)
2713{
2714 struct nfgenmsg *nfmsg;
2715 struct nlmsghdr *nlh;
c50b960c 2716 struct nlattr *desc;
128ad332
PNA		 2717 u32 portid = ctx->portid;
2718 u32 seq = ctx->seq;
20a69341 2719
dedb67c4 2720 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 2721 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2722 flags);
2723 if (nlh == NULL)
2724 goto nla_put_failure;
2725
2726 nfmsg = nlmsg_data(nlh);
2727 nfmsg->nfgen_family = ctx->afi->family;
2728 nfmsg->version = NFNETLINK_V0;
84d7fce6 2729 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 2730
2731 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2732 goto nla_put_failure;
2733 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2734 goto nla_put_failure;
2735 if (set->flags != 0)
2736 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2737 goto nla_put_failure;
2738
2739 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2740 goto nla_put_failure;
2741 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2742 goto nla_put_failure;
2743 if (set->flags & NFT_SET_MAP) {
2744 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2745 goto nla_put_failure;
2746 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2747 goto nla_put_failure;
2748 }
8aeff920
PNA		 2749 if (set->flags & NFT_SET_OBJECT &&
2750 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2751 goto nla_put_failure;
20a69341 2752
761da293 2753 if (set->timeout &&
d3e2a111
AP		 2754 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2755 cpu_to_be64(jiffies_to_msecs(set->timeout)),
b46f6ded 2756 NFTA_SET_PAD))
761da293
PM		 2757 goto nla_put_failure;
2758 if (set->gc_int &&
2759 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2760 goto nla_put_failure;
2761
9363dc4b
AB		 2762 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2763 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2764 goto nla_put_failure;
2765 }
2766
e6d8ecac
CFG		 2767 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2768 goto nla_put_failure;
2769
c50b960c
PM		 2770 desc = nla_nest_start(skb, NFTA_SET_DESC);
2771 if (desc == NULL)
2772 goto nla_put_failure;
2773 if (set->size &&
2774 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2775 goto nla_put_failure;
2776 nla_nest_end(skb, desc);
2777
053c095a
JB		 2778 nlmsg_end(skb, nlh);
2779 return 0;
20a69341
PM		 2780
2781nla_put_failure:
2782 nlmsg_trim(skb, nlh);
2783 return -1;
2784}
2785
25e94a99
PNA		 2786static void nf_tables_set_notify(const struct nft_ctx *ctx,
2787 const struct nft_set *set, int event,
2788 gfp_t gfp_flags)
20a69341
PM		 2789{
2790 struct sk_buff *skb;
128ad332 2791 u32 portid = ctx->portid;
20a69341
PM		 2792 int err;
2793
128ad332
PNA		 2794 if (!ctx->report &&
2795 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2796 return;
20a69341 2797
31f8441c 2798 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 2799 if (skb == NULL)
2800 goto err;
2801
2802 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2803 if (err < 0) {
2804 kfree_skb(skb);
2805 goto err;
2806 }
2807
25e94a99
PNA		 2808 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2809 gfp_flags);
2810 return;
20a69341 2811err:
25e94a99 2812 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 2813}
2814
5b96af77 2815static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 2816{
2817 const struct nft_set *set;
2818 unsigned int idx, s_idx = cb->args[0];
7c95f6d8 2819 struct nft_af_info *afi;
c9c8e485
PNA		 2820 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2821 struct net *net = sock_net(skb->sk);
2822 int cur_family = cb->args[3];
5b96af77 2823 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 2824
2825 if (cb->args[1])
2826 return skb->len;
2827
e688a7f8 2828 rcu_read_lock();
38e029f1
PNA		 2829 cb->seq = net->nft.base_seq;
2830
e688a7f8 2831 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5b96af77
PNA		 2832 if (ctx->afi && ctx->afi != afi)
2833 continue;
2834
c9c8e485
PNA		 2835 if (cur_family) {
2836 if (afi->family != cur_family)
2837 continue;
2838
2839 cur_family = 0;
2840 }
e688a7f8 2841 list_for_each_entry_rcu(table, &afi->tables, list) {
5b96af77
PNA		 2842 if (ctx->table && ctx->table != table)
2843 continue;
2844
c9c8e485
PNA		 2845 if (cur_table) {
2846 if (cur_table != table)
2847 continue;
2848
2849 cur_table = NULL;
2850 }
c9c8e485 2851 idx = 0;
5b96af77 2852 list_for_each_entry_rcu(set, &table->sets, list) {
c9c8e485
PNA		 2853 if (idx < s_idx)
2854 goto cont;
37a9cc52
PNA		 2855 if (!nft_is_active(net, set))
2856 goto cont;
5b96af77
PNA		 2857
2858 ctx_set = *ctx;
2859 ctx_set.table = table;
2860 ctx_set.afi = afi;
2861 if (nf_tables_fill_set(skb, &ctx_set, set,
c9c8e485
PNA		 2862 NFT_MSG_NEWSET,
2863 NLM_F_MULTI) < 0) {
2864 cb->args[0] = idx;
2865 cb->args[2] = (unsigned long) table;
2866 cb->args[3] = afi->family;
2867 goto done;
2868 }
38e029f1 2869 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485
PNA		 2870cont:
2871 idx++;
2872 }
2873 if (s_idx)
2874 s_idx = 0;
2875 }
2876 }
2877 cb->args[1] = 1;
2878done:
e688a7f8 2879 rcu_read_unlock();
c9c8e485
PNA		 2880 return skb->len;
2881}
2882
5b96af77 2883static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 2884{
5b96af77
PNA		 2885 kfree(cb->data);
2886 return 0;
20a69341
PM		 2887}
2888
7b8002a1
PNA		 2889static int nf_tables_getset(struct net *net, struct sock *nlsk,
2890 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2891 const struct nlattr * const nla[],
2892 struct netlink_ext_ack *extack)
20a69341 2893{
f2a6d766 2894 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 2895 const struct nft_set *set;
2896 struct nft_ctx ctx;
2897 struct sk_buff *skb2;
c9c8e485 2898 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 2899 int err;
2900
01cfa0a4 2901 /* Verify existence before starting dump */
f2a6d766 2902 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 2903 if (err < 0)
2904 return err;
2905
2906 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2907 struct netlink_dump_control c = {
2908 .dump = nf_tables_dump_sets,
5b96af77 2909 .done = nf_tables_dump_sets_done,
20a69341 2910 };
5b96af77
PNA		 2911 struct nft_ctx *ctx_dump;
2912
2913 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2914 if (ctx_dump == NULL)
2915 return -ENOMEM;
2916
2917 *ctx_dump = ctx;
2918 c.data = ctx_dump;
2919
20a69341
PM		 2920 return netlink_dump_start(nlsk, skb, nlh, &c);
2921 }
2922
c9c8e485
PNA		 2923 /* Only accept unspec with dump */
2924 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2925 return -EAFNOSUPPORT;
eaa2bcd6
PT		 2926 if (!nla[NFTA_SET_TABLE])
2927 return -EINVAL;
c9c8e485 2928
37a9cc52 2929 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 2930 if (IS_ERR(set))
2931 return PTR_ERR(set);
2932
2933 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2934 if (skb2 == NULL)
2935 return -ENOMEM;
2936
2937 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2938 if (err < 0)
2939 goto err;
2940
2941 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2942
2943err:
2944 kfree_skb(skb2);
2945 return err;
2946}
2947
c50b960c
PM		 2948static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2949 struct nft_set_desc *desc,
2950 const struct nlattr *nla)
2951{
2952 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2953 int err;
2954
fceb6435
JB		 2955 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
2956 nft_set_desc_policy, NULL);
c50b960c
PM		 2957 if (err < 0)
2958 return err;
2959
2960 if (da[NFTA_SET_DESC_SIZE] != NULL)
2961 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2962
2963 return 0;
2964}
2965
633c9a84
PNA		 2966static int nf_tables_newset(struct net *net, struct sock *nlsk,
2967 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2968 const struct nlattr * const nla[],
2969 struct netlink_ext_ack *extack)
20a69341
PM		 2970{
2971 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2972 u8 genmask = nft_genmask_next(net);
20a69341 2973 const struct nft_set_ops *ops;
7c95f6d8 2974 struct nft_af_info *afi;
20a69341
PM		 2975 struct nft_table *table;
2976 struct nft_set *set;
2977 struct nft_ctx ctx;
38745490 2978 char *name;
20a69341
PM		 2979 unsigned int size;
2980 bool create;
761da293 2981 u64 timeout;
8aeff920 2982 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 2983 struct nft_set_desc desc;
e6d8ecac
CFG		 2984 unsigned char *udata;
2985 u16 udlen;
20a69341
PM		 2986 int err;
2987
2988 if (nla[NFTA_SET_TABLE] == NULL ||
2989 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 2990 nla[NFTA_SET_KEY_LEN] == NULL ||
2991 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 2992 return -EINVAL;
2993
c50b960c
PM		 2994 memset(&desc, 0, sizeof(desc));
2995
20a69341
PM		 2996 ktype = NFT_DATA_VALUE;
2997 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2998 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2999 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3000 return -EINVAL;
3001 }
3002
c50b960c 3003 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 3004 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3005 return -EINVAL;
3006
3007 flags = 0;
3008 if (nla[NFTA_SET_FLAGS] != NULL) {
3009 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3010 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 3011 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 3012 NFT_SET_MAP | NFT_SET_EVAL |
3013 NFT_SET_OBJECT))
20a69341 3014 return -EINVAL;
8aeff920
PNA		 3015 /* Only one of these operations is supported */
3016 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3017 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3018 return -EOPNOTSUPP;
20a69341
PM		 3019 }
3020
3021 dtype = 0;
20a69341
PM		 3022 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3023 if (!(flags & NFT_SET_MAP))
3024 return -EINVAL;
3025
3026 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3027 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3028 dtype != NFT_DATA_VERDICT)
3029 return -EINVAL;
3030
3031 if (dtype != NFT_DATA_VERDICT) {
3032 if (nla[NFTA_SET_DATA_LEN] == NULL)
3033 return -EINVAL;
c50b960c 3034 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 3035 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3036 return -EINVAL;
3037 } else
7d740264 3038 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 3039 } else if (flags & NFT_SET_MAP)
3040 return -EINVAL;
3041
8aeff920
PNA		 3042 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3043 if (!(flags & NFT_SET_OBJECT))
3044 return -EINVAL;
3045
3046 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3047 if (objtype == NFT_OBJECT_UNSPEC ||
3048 objtype > NFT_OBJECT_MAX)
3049 return -EINVAL;
3050 } else if (flags & NFT_SET_OBJECT)
3051 return -EINVAL;
3052 else
3053 objtype = NFT_OBJECT_UNSPEC;
3054
761da293
PM		 3055 timeout = 0;
3056 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3057 if (!(flags & NFT_SET_TIMEOUT))
3058 return -EINVAL;
d3e2a111
AP		 3059 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3060 nla[NFTA_SET_TIMEOUT])));
761da293
PM		 3061 }
3062 gc_int = 0;
3063 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3064 if (!(flags & NFT_SET_TIMEOUT))
3065 return -EINVAL;
3066 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3067 }
3068
c50b960c
PM		 3069 policy = NFT_SET_POL_PERFORMANCE;
3070 if (nla[NFTA_SET_POLICY] != NULL)
3071 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3072
3073 if (nla[NFTA_SET_DESC] != NULL) {
3074 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3075 if (err < 0)
3076 return err;
3077 }
3078
20a69341
PM		 3079 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3080
99633ab2 3081 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
20a69341
PM		 3082 if (IS_ERR(afi))
3083 return PTR_ERR(afi);
3084
f2a6d766 3085 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
20a69341
PM		 3086 if (IS_ERR(table))
3087 return PTR_ERR(table);
3088
633c9a84 3089 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341 3090
37a9cc52 3091 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3092 if (IS_ERR(set)) {
3093 if (PTR_ERR(set) != -ENOENT)
3094 return PTR_ERR(set);
1a28ad74 3095 } else {
20a69341
PM		 3096 if (nlh->nlmsg_flags & NLM_F_EXCL)
3097 return -EEXIST;
3098 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3099 return -EOPNOTSUPP;
3100 return 0;
3101 }
3102
3103 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3104 return -ENOENT;
3105
2b664957 3106 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 3107 if (IS_ERR(ops))
3108 return PTR_ERR(ops);
3109
e6d8ecac
CFG		 3110 udlen = 0;
3111 if (nla[NFTA_SET_USERDATA])
3112 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3113
20a69341
PM		 3114 size = 0;
3115 if (ops->privsize != NULL)
347b408d 3116 size = ops->privsize(nla, &desc);
20a69341 3117
1ff75a3e
PNA		 3118 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3119 if (!set) {
3120 err = -ENOMEM;
20a69341 3121 goto err1;
1ff75a3e 3122 }
20a69341 3123
38745490
PS		 3124 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3125 if (!name) {
3126 err = -ENOMEM;
3127 goto err2;
3128 }
3129
20a69341 3130 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 3131 kfree(name);
20a69341
PM		 3132 if (err < 0)
3133 goto err2;
3134
e6d8ecac
CFG		 3135 udata = NULL;
3136 if (udlen) {
3137 udata = set->data + size;
3138 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3139 }
3140
20a69341
PM		 3141 INIT_LIST_HEAD(&set->bindings);
3142 set->ops = ops;
3143 set->ktype = ktype;
c50b960c 3144 set->klen = desc.klen;
20a69341 3145 set->dtype = dtype;
8aeff920 3146 set->objtype = objtype;
c50b960c 3147 set->dlen = desc.dlen;
20a69341 3148 set->flags = flags;
c50b960c 3149 set->size = desc.size;
9363dc4b 3150 set->policy = policy;
e6d8ecac
CFG		 3151 set->udlen = udlen;
3152 set->udata = udata;
761da293
PM		 3153 set->timeout = timeout;
3154 set->gc_int = gc_int;
20a69341 3155
c50b960c 3156 err = ops->init(set, &desc, nla);
20a69341
PM		 3157 if (err < 0)
3158 goto err2;
3159
958bee14 3160 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3161 if (err < 0)
c17c3cdf 3162 goto err3;
20a69341 3163
e688a7f8 3164 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3165 table->use++;
20a69341
PM		 3166 return 0;
3167
c17c3cdf
LZ		 3168err3:
3169 ops->destroy(set);
20a69341 3170err2:
1ff75a3e 3171 kvfree(set);
20a69341 3172err1:
2b664957 3173 module_put(ops->type->owner);
20a69341
PM		 3174 return err;
3175}
3176
958bee14 3177static void nft_set_destroy(struct nft_set *set)
20a69341 3178{
20a69341 3179 set->ops->destroy(set);
2b664957 3180 module_put(set->ops->type->owner);
38745490 3181 kfree(set->name);
1ff75a3e 3182 kvfree(set);
20a69341
PM		 3183}
3184
958bee14
PNA		 3185static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3186{
e688a7f8 3187 list_del_rcu(&set->list);
31f8441c 3188 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
958bee14
PNA		 3189 nft_set_destroy(set);
3190}
3191
633c9a84
PNA		 3192static int nf_tables_delset(struct net *net, struct sock *nlsk,
3193 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3194 const struct nlattr * const nla[],
3195 struct netlink_ext_ack *extack)
20a69341 3196{
c9c8e485 3197 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3198 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3199 struct nft_set *set;
3200 struct nft_ctx ctx;
3201 int err;
3202
ec2c9935
PM		 3203 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3204 return -EAFNOSUPPORT;
20a69341
PM		 3205 if (nla[NFTA_SET_TABLE] == NULL)
3206 return -EINVAL;
3207
f2a6d766 3208 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3209 if (err < 0)
3210 return err;
3211
37a9cc52 3212 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3213 if (IS_ERR(set))
3214 return PTR_ERR(set);
3215 if (!list_empty(&set->bindings))
3216 return -EBUSY;
3217
ee01d542 3218 return nft_delset(&ctx, set);
20a69341
PM		 3219}
3220
3221static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3222 struct nft_set *set,
20a69341 3223 const struct nft_set_iter *iter,
de70185d 3224 struct nft_set_elem *elem)
20a69341 3225{
fe2811eb 3226 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3227 enum nft_registers dreg;
3228
3229 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3230 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3231 set->dtype == NFT_DATA_VERDICT ?
3232 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3233 set->dlen);
20a69341
PM		 3234}
3235
3236int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3237 struct nft_set_binding *binding)
3238{
3239 struct nft_set_binding *i;
3240 struct nft_set_iter iter;
3241
3242 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
3243 return -EBUSY;
3244
11113e19 3245 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3246 /* If the set is already bound to the same chain all
3247 * jumps are already validated for that chain.
3248 */
3249 list_for_each_entry(i, &set->bindings, list) {
a4684402 3250 if (i->flags & NFT_SET_MAP &&
11113e19 3251 i->chain == binding->chain)
20a69341
PM		 3252 goto bind;
3253 }
3254
8588ac09 3255 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3256 iter.skip = 0;
3257 iter.count = 0;
3258 iter.err = 0;
3259 iter.fn = nf_tables_bind_check_setelem;
3260
3261 set->ops->walk(ctx, set, &iter);
a02f4248 3262 if (iter.err < 0)
20a69341 3263 return iter.err;
20a69341
PM		 3264 }
3265bind:
3266 binding->chain = ctx->chain;
e688a7f8 3267 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3268 return 0;
3269}
63aea290 3270EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341
PM		 3271
3272void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3273 struct nft_set_binding *binding)
3274{
e688a7f8 3275 list_del_rcu(&binding->list);
20a69341 3276
958bee14 3277 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
37a9cc52 3278 nft_is_active(ctx->net, set))
20a69341
PM		 3279 nf_tables_set_destroy(ctx, set);
3280}
63aea290 3281EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3282
3ac4c07a
PM		 3283const struct nft_set_ext_type nft_set_ext_types[] = {
3284 [NFT_SET_EXT_KEY] = {
7d740264 3285 .align = __alignof__(u32),
3ac4c07a
PM		 3286 },
3287 [NFT_SET_EXT_DATA] = {
7d740264 3288 .align = __alignof__(u32),
3ac4c07a 3289 },
f25ad2e9
PM		 3290 [NFT_SET_EXT_EXPR] = {
3291 .align = __alignof__(struct nft_expr),
3292 },
8aeff920
PNA		 3293 [NFT_SET_EXT_OBJREF] = {
3294 .len = sizeof(struct nft_object *),
3295 .align = __alignof__(struct nft_object *),
3296 },
3ac4c07a
PM		 3297 [NFT_SET_EXT_FLAGS] = {
3298 .len = sizeof(u8),
3299 .align = __alignof__(u8),
3300 },
c3e1b005
PM		 3301 [NFT_SET_EXT_TIMEOUT] = {
3302 .len = sizeof(u64),
3303 .align = __alignof__(u64),
3304 },
3305 [NFT_SET_EXT_EXPIRATION] = {
3306 .len = sizeof(unsigned long),
3307 .align = __alignof__(unsigned long),
3308 },
68e942e8
PM		 3309 [NFT_SET_EXT_USERDATA] = {
3310 .len = sizeof(struct nft_userdata),
3311 .align = __alignof__(struct nft_userdata),
3312 },
3ac4c07a
PM		 3313};
3314EXPORT_SYMBOL_GPL(nft_set_ext_types);
3315
20a69341
PM		 3316/*
3317 * Set elements
3318 */
3319
3320static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3321 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3322 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3323 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3324 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3325 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3326 .len = NFT_USERDATA_MAXLEN },
20a69341
PM		 3327};
3328
3329static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3330 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3331 .len = NFT_TABLE_MAXNAMELEN - 1 },
3332 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3333 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3334 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3335 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3336};
3337
633c9a84 3338static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3339 const struct sk_buff *skb,
3340 const struct nlmsghdr *nlh,
f2a6d766
PNA		 3341 const struct nlattr * const nla[],
3342 u8 genmask)
20a69341
PM		 3343{
3344 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7c95f6d8
PNA		 3345 struct nft_af_info *afi;
3346 struct nft_table *table;
20a69341 3347
99633ab2 3348 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
20a69341
PM		 3349 if (IS_ERR(afi))
3350 return PTR_ERR(afi);
3351
f2a6d766
PNA		 3352 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3353 genmask);
20a69341
PM		 3354 if (IS_ERR(table))
3355 return PTR_ERR(table);
3356
633c9a84 3357 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
20a69341
PM		 3358 return 0;
3359}
3360
3361static int nf_tables_fill_setelem(struct sk_buff *skb,
3362 const struct nft_set *set,
3363 const struct nft_set_elem *elem)
3364{
fe2811eb 3365 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3366 unsigned char *b = skb_tail_pointer(skb);
3367 struct nlattr *nest;
3368
3369 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3370 if (nest == NULL)
3371 goto nla_put_failure;
3372
fe2811eb
PM		 3373 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3374 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3375 goto nla_put_failure;
3376
fe2811eb
PM		 3377 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3378 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3379 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3380 set->dlen) < 0)
3381 goto nla_put_failure;
3382
f25ad2e9
PM		 3383 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3384 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3385 goto nla_put_failure;
3386
8aeff920
PNA		 3387 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3388 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3389 (*nft_set_ext_obj(ext))->name) < 0)
3390 goto nla_put_failure;
3391
fe2811eb
PM		 3392 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3393 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3394 htonl(*nft_set_ext_flags(ext))))
3395 goto nla_put_failure;
20a69341 3396
c3e1b005
PM		 3397 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3398 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
d3e2a111
AP		 3399 cpu_to_be64(jiffies_to_msecs(
3400 *nft_set_ext_timeout(ext))),
b46f6ded 3401 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3402 goto nla_put_failure;
3403
3404 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3405 unsigned long expires, now = jiffies;
3406
3407 expires = *nft_set_ext_expiration(ext);
3408 if (time_before(now, expires))
3409 expires -= now;
3410 else
3411 expires = 0;
3412
3413 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
b46f6ded
ND		 3414 cpu_to_be64(jiffies_to_msecs(expires)),
3415 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3416 goto nla_put_failure;
3417 }
3418
68e942e8
PM		 3419 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3420 struct nft_userdata *udata;
3421
3422 udata = nft_set_ext_userdata(ext);
3423 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3424 udata->len + 1, udata->data))
3425 goto nla_put_failure;
3426 }
3427
20a69341
PM		 3428 nla_nest_end(skb, nest);
3429 return 0;
3430
3431nla_put_failure:
3432 nlmsg_trim(skb, b);
3433 return -EMSGSIZE;
3434}
3435
3436struct nft_set_dump_args {
3437 const struct netlink_callback *cb;
3438 struct nft_set_iter iter;
3439 struct sk_buff *skb;
3440};
3441
3442static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3443 struct nft_set *set,
20a69341 3444 const struct nft_set_iter *iter,
de70185d 3445 struct nft_set_elem *elem)
20a69341
PM		 3446{
3447 struct nft_set_dump_args *args;
3448
3449 args = container_of(iter, struct nft_set_dump_args, iter);
3450 return nf_tables_fill_setelem(args->skb, set, elem);
3451}
3452
fa803605
LZ		 3453struct nft_set_dump_ctx {
3454 const struct nft_set *set;
3455 struct nft_ctx ctx;
3456};
3457
20a69341
PM		 3458static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3459{
fa803605 3460 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 3461 struct net *net = sock_net(skb->sk);
fa803605
LZ		 3462 struct nft_af_info *afi;
3463 struct nft_table *table;
de70185d 3464 struct nft_set *set;
20a69341 3465 struct nft_set_dump_args args;
fa803605 3466 bool set_found = false;
20a69341
PM		 3467 struct nfgenmsg *nfmsg;
3468 struct nlmsghdr *nlh;
3469 struct nlattr *nest;
3470 u32 portid, seq;
fa803605 3471 int event;
20a69341 3472
fa803605
LZ		 3473 rcu_read_lock();
3474 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3475 if (afi != dump_ctx->ctx.afi)
3476 continue;
20a69341 3477
fa803605
LZ		 3478 list_for_each_entry_rcu(table, &afi->tables, list) {
3479 if (table != dump_ctx->ctx.table)
3480 continue;
20a69341 3481
fa803605
LZ		 3482 list_for_each_entry_rcu(set, &table->sets, list) {
3483 if (set == dump_ctx->set) {
3484 set_found = true;
3485 break;
3486 }
3487 }
3488 break;
3489 }
3490 break;
3491 }
3492
3493 if (!set_found) {
3494 rcu_read_unlock();
3495 return -ENOENT;
3496 }
20a69341 3497
dedb67c4 3498 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3499 portid = NETLINK_CB(cb->skb).portid;
3500 seq = cb->nlh->nlmsg_seq;
3501
3502 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3503 NLM_F_MULTI);
3504 if (nlh == NULL)
3505 goto nla_put_failure;
3506
3507 nfmsg = nlmsg_data(nlh);
fa803605 3508 nfmsg->nfgen_family = afi->family;
20a69341 3509 nfmsg->version = NFNETLINK_V0;
fa803605 3510 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 3511
fa803605 3512 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 3513 goto nla_put_failure;
3514 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3515 goto nla_put_failure;
3516
3517 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3518 if (nest == NULL)
3519 goto nla_put_failure;
3520
8588ac09
PNA		 3521 args.cb = cb;
3522 args.skb = skb;
fa803605 3523 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 3524 args.iter.skip = cb->args[0];
3525 args.iter.count = 0;
3526 args.iter.err = 0;
3527 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 3528 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3529 rcu_read_unlock();
20a69341
PM		 3530
3531 nla_nest_end(skb, nest);
3532 nlmsg_end(skb, nlh);
3533
3534 if (args.iter.err && args.iter.err != -EMSGSIZE)
3535 return args.iter.err;
3536 if (args.iter.count == cb->args[0])
3537 return 0;
3538
3539 cb->args[0] = args.iter.count;
3540 return skb->len;
3541
3542nla_put_failure:
fa803605 3543 rcu_read_unlock();
20a69341
PM		 3544 return -ENOSPC;
3545}
3546
fa803605
LZ		 3547static int nf_tables_dump_set_done(struct netlink_callback *cb)
3548{
3549 kfree(cb->data);
3550 return 0;
3551}
3552
7b8002a1
PNA		 3553static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3554 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3555 const struct nlattr * const nla[],
3556 struct netlink_ext_ack *extack)
20a69341 3557{
f2a6d766 3558 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3559 const struct nft_set *set;
3560 struct nft_ctx ctx;
3561 int err;
3562
f2a6d766 3563 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3564 if (err < 0)
3565 return err;
3566
37a9cc52
PNA		 3567 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3568 genmask);
20a69341
PM		 3569 if (IS_ERR(set))
3570 return PTR_ERR(set);
3571
3572 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3573 struct netlink_dump_control c = {
3574 .dump = nf_tables_dump_set,
fa803605 3575 .done = nf_tables_dump_set_done,
20a69341 3576 };
fa803605
LZ		 3577 struct nft_set_dump_ctx *dump_ctx;
3578
3579 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3580 if (!dump_ctx)
3581 return -ENOMEM;
3582
3583 dump_ctx->set = set;
3584 dump_ctx->ctx = ctx;
3585
3586 c.data = dump_ctx;
20a69341
PM		 3587 return netlink_dump_start(nlsk, skb, nlh, &c);
3588 }
3589 return -EOPNOTSUPP;
3590}
3591
d60ce62f
AB		 3592static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3593 const struct nft_ctx *ctx, u32 seq,
3594 u32 portid, int event, u16 flags,
3595 const struct nft_set *set,
3596 const struct nft_set_elem *elem)
3597{
3598 struct nfgenmsg *nfmsg;
3599 struct nlmsghdr *nlh;
3600 struct nlattr *nest;
3601 int err;
3602
dedb67c4 3603 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 3604 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3605 flags);
3606 if (nlh == NULL)
3607 goto nla_put_failure;
3608
3609 nfmsg = nlmsg_data(nlh);
3610 nfmsg->nfgen_family = ctx->afi->family;
3611 nfmsg->version = NFNETLINK_V0;
84d7fce6 3612 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 3613
3614 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3615 goto nla_put_failure;
3616 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3617 goto nla_put_failure;
3618
3619 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3620 if (nest == NULL)
3621 goto nla_put_failure;
3622
3623 err = nf_tables_fill_setelem(skb, set, elem);
3624 if (err < 0)
3625 goto nla_put_failure;
3626
3627 nla_nest_end(skb, nest);
3628
053c095a
JB		 3629 nlmsg_end(skb, nlh);
3630 return 0;
d60ce62f
AB		 3631
3632nla_put_failure:
3633 nlmsg_trim(skb, nlh);
3634 return -1;
3635}
3636
25e94a99
PNA		 3637static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3638 const struct nft_set *set,
3639 const struct nft_set_elem *elem,
3640 int event, u16 flags)
d60ce62f 3641{
128ad332
PNA		 3642 struct net *net = ctx->net;
3643 u32 portid = ctx->portid;
d60ce62f
AB		 3644 struct sk_buff *skb;
3645 int err;
3646
128ad332 3647 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 3648 return;
d60ce62f 3649
d60ce62f
AB		 3650 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3651 if (skb == NULL)
3652 goto err;
3653
3654 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3655 set, elem);
3656 if (err < 0) {
3657 kfree_skb(skb);
3658 goto err;
3659 }
3660
25e94a99
PNA		 3661 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3662 GFP_KERNEL);
3663 return;
d60ce62f 3664err:
25e94a99 3665 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 3666}
3667
60319eb1
PNA		 3668static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3669 int msg_type,
3670 struct nft_set *set)
3671{
3672 struct nft_trans *trans;
3673
3674 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3675 if (trans == NULL)
3676 return NULL;
3677
3678 nft_trans_elem_set(trans) = set;
3679 return trans;
3680}
3681
22fe54d5
PM		 3682void *nft_set_elem_init(const struct nft_set *set,
3683 const struct nft_set_ext_tmpl *tmpl,
49499c3e 3684 const u32 *key, const u32 *data,
22fe54d5 3685 u64 timeout, gfp_t gfp)
fe2811eb
PM		 3686{
3687 struct nft_set_ext *ext;
3688 void *elem;
3689
3690 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3691 if (elem == NULL)
3692 return NULL;
3693
3694 ext = nft_set_elem_ext(set, elem);
3695 nft_set_ext_init(ext, tmpl);
3696
3697 memcpy(nft_set_ext_key(ext), key, set->klen);
3698 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3699 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 3700 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3701 *nft_set_ext_expiration(ext) =
d3e2a111 3702 jiffies + timeout;
c3e1b005
PM		 3703 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3704 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 3705
3706 return elem;
3707}
3708
61f9e292
LZ		 3709void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3710 bool destroy_expr)
61edafbb
PM		 3711{
3712 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3713
59105446 3714 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 3715 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 3716 nft_data_release(nft_set_ext_data(ext), set->dtype);
61f9e292 3717 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
f25ad2e9 3718 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
8aeff920
PNA		 3719 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3720 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 3721 kfree(elem);
3722}
3723EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3724
59105446
PNA		 3725/* Only called from commit path, nft_set_elem_deactivate() already deals with
3726 * the refcounting from the preparation phase.
3727 */
3728static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3729{
3730 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3731
3732 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3733 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3734 kfree(elem);
3735}
3736
0e9091d6
PNA		 3737static int nft_setelem_parse_flags(const struct nft_set *set,
3738 const struct nlattr *attr, u32 *flags)
3739{
3740 if (attr == NULL)
3741 return 0;
3742
3743 *flags = ntohl(nla_get_be32(attr));
3744 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3745 return -EINVAL;
3746 if (!(set->flags & NFT_SET_INTERVAL) &&
3747 *flags & NFT_SET_ELEM_INTERVAL_END)
3748 return -EINVAL;
3749
3750 return 0;
3751}
3752
60319eb1 3753static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 3754 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 3755{
3756 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 3757 u8 genmask = nft_genmask_next(ctx->net);
20a69341 3758 struct nft_data_desc d1, d2;
fe2811eb 3759 struct nft_set_ext_tmpl tmpl;
c016c7e4 3760 struct nft_set_ext *ext, *ext2;
20a69341
PM		 3761 struct nft_set_elem elem;
3762 struct nft_set_binding *binding;
8aeff920 3763 struct nft_object *obj = NULL;
68e942e8 3764 struct nft_userdata *udata;
fe2811eb 3765 struct nft_data data;
20a69341 3766 enum nft_registers dreg;
60319eb1 3767 struct nft_trans *trans;
0e9091d6 3768 u32 flags = 0;
c3e1b005 3769 u64 timeout;
68e942e8 3770 u8 ulen;
20a69341
PM		 3771 int err;
3772
3773 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 3774 nft_set_elem_policy, NULL);
20a69341
PM		 3775 if (err < 0)
3776 return err;
3777
3778 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3779 return -EINVAL;
3780
fe2811eb
PM		 3781 nft_set_ext_prepare(&tmpl);
3782
0e9091d6
PNA		 3783 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3784 if (err < 0)
3785 return err;
3786 if (flags != 0)
3787 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 3788
3789 if (set->flags & NFT_SET_MAP) {
3790 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 3791 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 3792 return -EINVAL;
bd7fc645 3793 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 3794 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 3795 return -EINVAL;
20a69341
PM		 3796 } else {
3797 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3798 return -EINVAL;
3799 }
3800
c3e1b005
PM		 3801 timeout = 0;
3802 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3803 if (!(set->flags & NFT_SET_TIMEOUT))
3804 return -EINVAL;
d3e2a111
AP		 3805 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3806 nla[NFTA_SET_ELEM_TIMEOUT])));
c3e1b005
PM		 3807 } else if (set->flags & NFT_SET_TIMEOUT) {
3808 timeout = set->timeout;
3809 }
3810
7d740264 3811 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 3812 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 3813 if (err < 0)
3814 goto err1;
3815 err = -EINVAL;
3816 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3817 goto err2;
3818
7d740264 3819 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 3820 if (timeout > 0) {
3821 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3822 if (timeout != set->timeout)
3823 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3824 }
fe2811eb 3825
8aeff920
PNA		 3826 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3827 if (!(set->flags & NFT_SET_OBJECT)) {
3828 err = -EINVAL;
3829 goto err2;
3830 }
3831 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3832 set->objtype, genmask);
3833 if (IS_ERR(obj)) {
3834 err = PTR_ERR(obj);
3835 goto err2;
3836 }
3837 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3838 }
3839
20a69341 3840 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 3841 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3842 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 3843 if (err < 0)
3844 goto err2;
3845
3846 err = -EINVAL;
3847 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3848 goto err3;
3849
3850 dreg = nft_type_to_reg(set->dtype);
3851 list_for_each_entry(binding, &set->bindings, list) {
3852 struct nft_ctx bind_ctx = {
58c78e10 3853 .net = ctx->net,
20a69341
PM		 3854 .afi = ctx->afi,
3855 .table = ctx->table,
7c95f6d8 3856 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 3857 };
3858
11113e19
PM		 3859 if (!(binding->flags & NFT_SET_MAP))
3860 continue;
3861
1ec10212
PM		 3862 err = nft_validate_register_store(&bind_ctx, dreg,
3863 &data,
3864 d2.type, d2.len);
20a69341
PM		 3865 if (err < 0)
3866 goto err3;
3867 }
fe2811eb 3868
7d740264 3869 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 3870 }
3871
68e942e8
PM		 3872 /* The full maximum length of userdata can exceed the maximum
3873 * offset value (U8_MAX) for following extensions, therefor it
3874 * must be the last extension added.
3875 */
3876 ulen = 0;
3877 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
3878 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
3879 if (ulen > 0)
3880 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
3881 ulen);
3882 }
3883
fe2811eb 3884 err = -ENOMEM;
7d740264 3885 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 3886 timeout, GFP_KERNEL);
fe2811eb
PM		 3887 if (elem.priv == NULL)
3888 goto err3;
3889
3890 ext = nft_set_elem_ext(set, elem.priv);
3891 if (flags)
3892 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 3893 if (ulen > 0) {
3894 udata = nft_set_ext_userdata(ext);
3895 udata->len = ulen - 1;
3896 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
3897 }
8aeff920
PNA		 3898 if (obj) {
3899 *nft_set_ext_obj(ext) = obj;
3900 obj->use++;
3901 }
fe2811eb 3902
60319eb1
PNA		 3903 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3904 if (trans == NULL)
fe2811eb 3905 goto err4;
60319eb1 3906
69086658 3907 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 3908 err = set->ops->insert(ctx->net, set, &elem, &ext2);
3909 if (err) {
3910 if (err == -EEXIST) {
9744a6fc
PNA		 3911 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
3912 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
3913 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
3914 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
3915 return -EBUSY;
8aeff920
PNA		 3916 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3917 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
3918 memcmp(nft_set_ext_data(ext),
3919 nft_set_ext_data(ext2), set->dlen) != 0) ||
3920 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3921 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
3922 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 3923 err = -EBUSY;
3924 else if (!(nlmsg_flags & NLM_F_EXCL))
3925 err = 0;
3926 }
fe2811eb 3927 goto err5;
c016c7e4 3928 }
20a69341 3929
35d0ac90
PNA		 3930 if (set->size &&
3931 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
3932 err = -ENFILE;
3933 goto err6;
3934 }
3935
60319eb1 3936 nft_trans_elem(trans) = elem;
46bbafce 3937 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 3938 return 0;
3939
35d0ac90 3940err6:
5cb82a38 3941 set->ops->remove(ctx->net, set, &elem);
fe2811eb 3942err5:
60319eb1 3943 kfree(trans);
fe2811eb
PM		 3944err4:
3945 kfree(elem.priv);
20a69341
PM		 3946err3:
3947 if (nla[NFTA_SET_ELEM_DATA] != NULL)
59105446 3948 nft_data_release(&data, d2.type);
20a69341 3949err2:
59105446 3950 nft_data_release(&elem.key.val, d1.type);
20a69341
PM		 3951err1:
3952 return err;
3953}
3954
633c9a84
PNA		 3955static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
3956 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3957 const struct nlattr * const nla[],
3958 struct netlink_ext_ack *extack)
20a69341 3959{
f2a6d766 3960 u8 genmask = nft_genmask_next(net);
20a69341
PM		 3961 const struct nlattr *attr;
3962 struct nft_set *set;
3963 struct nft_ctx ctx;
60319eb1 3964 int rem, err = 0;
20a69341 3965
7d5570ca
PNA		 3966 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
3967 return -EINVAL;
3968
f2a6d766 3969 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 3970 if (err < 0)
3971 return err;
3972
37a9cc52
PNA		 3973 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3974 genmask);
958bee14
PNA		 3975 if (IS_ERR(set)) {
3976 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3977 set = nf_tables_set_lookup_byid(net,
37a9cc52
PNA		 3978 nla[NFTA_SET_ELEM_LIST_SET_ID],
3979 genmask);
958bee14
PNA		 3980 }
3981 if (IS_ERR(set))
3982 return PTR_ERR(set);
3983 }
3984
20a69341
PM		 3985 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3986 return -EBUSY;
3987
3988 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 3989 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 3990 if (err < 0)
60319eb1 3991 break;
20a69341 3992 }
60319eb1 3993 return err;
20a69341
PM		 3994}
3995
59105446
PNA		 3996/**
3997 * nft_data_hold - hold a nft_data item
3998 *
3999 * @data: struct nft_data to release
4000 * @type: type of data
4001 *
4002 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4003 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4004 * NFT_GOTO verdicts. This function must be called on active data objects
4005 * from the second phase of the commit protocol.
4006 */
4007static void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4008{
4009 if (type == NFT_DATA_VERDICT) {
4010 switch (data->verdict.code) {
4011 case NFT_JUMP:
4012 case NFT_GOTO:
4013 data->verdict.chain->use++;
4014 break;
4015 }
4016 }
4017}
4018
4019static void nft_set_elem_activate(const struct net *net,
4020 const struct nft_set *set,
4021 struct nft_set_elem *elem)
4022{
4023 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4024
4025 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4026 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4027 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4028 (*nft_set_ext_obj(ext))->use++;
4029}
4030
4031static void nft_set_elem_deactivate(const struct net *net,
4032 const struct nft_set *set,
4033 struct nft_set_elem *elem)
4034{
4035 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4036
4037 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4038 nft_data_release(nft_set_ext_data(ext), set->dtype);
4039 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4040 (*nft_set_ext_obj(ext))->use--;
4041}
4042
60319eb1 4043static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 4044 const struct nlattr *attr)
4045{
4046 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 4047 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 4048 struct nft_data_desc desc;
4049 struct nft_set_elem elem;
3971ca14 4050 struct nft_set_ext *ext;
60319eb1 4051 struct nft_trans *trans;
3971ca14
PNA		 4052 u32 flags = 0;
4053 void *priv;
20a69341
PM		 4054 int err;
4055
4056 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4057 nft_set_elem_policy, NULL);
20a69341
PM		 4058 if (err < 0)
4059 goto err1;
4060
4061 err = -EINVAL;
4062 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4063 goto err1;
4064
3971ca14
PNA		 4065 nft_set_ext_prepare(&tmpl);
4066
4067 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4068 if (err < 0)
4069 return err;
4070 if (flags != 0)
4071 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4072
7d740264 4073 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 4074 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4075 if (err < 0)
4076 goto err1;
4077
4078 err = -EINVAL;
4079 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4080 goto err2;
4081
3971ca14
PNA		 4082 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4083
4084 err = -ENOMEM;
4085 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4086 GFP_KERNEL);
4087 if (elem.priv == NULL)
4088 goto err2;
4089
4090 ext = nft_set_elem_ext(set, elem.priv);
4091 if (flags)
4092 *nft_set_ext_flags(ext) = flags;
4093
60319eb1 4094 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 4095 if (trans == NULL) {
4096 err = -ENOMEM;
3971ca14 4097 goto err3;
609ccf08 4098 }
20a69341 4099
42a55769 4100 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 4101 if (priv == NULL) {
cc02e457 4102 err = -ENOENT;
3971ca14 4103 goto err4;
cc02e457 4104 }
3971ca14
PNA		 4105 kfree(elem.priv);
4106 elem.priv = priv;
cc02e457 4107
59105446
PNA		 4108 nft_set_elem_deactivate(ctx->net, set, &elem);
4109
60319eb1 4110 nft_trans_elem(trans) = elem;
46bbafce 4111 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 4112 return 0;
cc02e457 4113
3971ca14 4114err4:
cc02e457 4115 kfree(trans);
3971ca14
PNA		 4116err3:
4117 kfree(elem.priv);
20a69341 4118err2:
59105446 4119 nft_data_release(&elem.key.val, desc.type);
20a69341
PM		 4120err1:
4121 return err;
4122}
4123
8411b644 4124static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 4125 struct nft_set *set,
8411b644 4126 const struct nft_set_iter *iter,
de70185d 4127 struct nft_set_elem *elem)
8411b644
PNA		 4128{
4129 struct nft_trans *trans;
4130 int err;
4131
4132 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4133 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4134 if (!trans)
4135 return -ENOMEM;
4136
1ba1c414 4137 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 4138 err = -ENOENT;
4139 goto err1;
4140 }
b2c11e4b 4141 set->ndeact++;
8411b644 4142
de70185d
PNA		 4143 nft_trans_elem_set(trans) = set;
4144 nft_trans_elem(trans) = *elem;
8411b644
PNA		 4145 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4146
4147 return 0;
4148err1:
4149 kfree(trans);
4150 return err;
4151}
4152
633c9a84
PNA		 4153static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4154 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4155 const struct nlattr * const nla[],
4156 struct netlink_ext_ack *extack)
20a69341 4157{
f2a6d766 4158 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4159 const struct nlattr *attr;
4160 struct nft_set *set;
4161 struct nft_ctx ctx;
60319eb1 4162 int rem, err = 0;
20a69341 4163
f2a6d766 4164 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
20a69341
PM		 4165 if (err < 0)
4166 return err;
4167
37a9cc52
PNA		 4168 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4169 genmask);
20a69341
PM		 4170 if (IS_ERR(set))
4171 return PTR_ERR(set);
4172 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4173 return -EBUSY;
4174
8411b644 4175 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 4176 struct nft_set_iter iter = {
4177 .genmask = genmask,
4178 .fn = nft_flush_set,
8411b644 4179 };
baa2d42c 4180 set->ops->walk(&ctx, set, &iter);
8411b644 4181
baa2d42c 4182 return iter.err;
8411b644
PNA		 4183 }
4184
20a69341
PM		 4185 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4186 err = nft_del_setelem(&ctx, set, attr);
4187 if (err < 0)
60319eb1 4188 break;
4fefee57 4189
3dd0673a 4190 set->ndeact++;
20a69341 4191 }
60319eb1 4192 return err;
20a69341
PM		 4193}
4194
cfed7e1b
PM		 4195void nft_set_gc_batch_release(struct rcu_head *rcu)
4196{
4197 struct nft_set_gc_batch *gcb;
4198 unsigned int i;
4199
4200 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4201 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4202 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4203 kfree(gcb);
4204}
4205EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4206
4207struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4208 gfp_t gfp)
4209{
4210 struct nft_set_gc_batch *gcb;
4211
4212 gcb = kzalloc(sizeof(*gcb), gfp);
4213 if (gcb == NULL)
4214 return gcb;
4215 gcb->head.set = set;
4216 return gcb;
4217}
4218EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4219
e5009240
PNA		 4220/*
4221 * Stateful objects
4222 */
4223
4224/**
4225 * nft_register_obj- register nf_tables stateful object type
4226 * @obj: object type
4227 *
4228 * Registers the object type for use with nf_tables. Returns zero on
4229 * success or a negative errno code otherwise.
4230 */
4231int nft_register_obj(struct nft_object_type *obj_type)
4232{
4233 if (obj_type->type == NFT_OBJECT_UNSPEC)
4234 return -EINVAL;
4235
4236 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4237 list_add_rcu(&obj_type->list, &nf_tables_objects);
4238 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4239 return 0;
4240}
4241EXPORT_SYMBOL_GPL(nft_register_obj);
4242
4243/**
4244 * nft_unregister_obj - unregister nf_tables object type
4245 * @obj: object type
4246 *
4247 * Unregisters the object type for use with nf_tables.
4248 */
4249void nft_unregister_obj(struct nft_object_type *obj_type)
4250{
4251 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4252 list_del_rcu(&obj_type->list);
4253 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4254}
4255EXPORT_SYMBOL_GPL(nft_unregister_obj);
4256
4257struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4258 const struct nlattr *nla,
4259 u32 objtype, u8 genmask)
4260{
4261 struct nft_object *obj;
4262
4263 list_for_each_entry(obj, &table->objects, list) {
4264 if (!nla_strcmp(nla, obj->name) &&
dfc46034 4265 objtype == obj->ops->type->type &&
e5009240
PNA		 4266 nft_active_genmask(obj, genmask))
4267 return obj;
4268 }
4269 return ERR_PTR(-ENOENT);
4270}
4271EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4272
4273static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4274 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4275 .len = NFT_TABLE_MAXNAMELEN - 1 },
4276 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4277 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4278 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4279 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4280};
4281
84fba055
FW		 4282static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4283 const struct nft_object_type *type,
e5009240
PNA		 4284 const struct nlattr *attr)
4285{
4286 struct nlattr *tb[type->maxattr + 1];
dfc46034 4287 const struct nft_object_ops *ops;
e5009240
PNA		 4288 struct nft_object *obj;
4289 int err;
4290
4291 if (attr) {
fceb6435
JB		 4292 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4293 NULL);
e5009240
PNA		 4294 if (err < 0)
4295 goto err1;
4296 } else {
4297 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4298 }
4299
dfc46034
PBG		 4300 if (type->select_ops) {
4301 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4302 if (IS_ERR(ops)) {
4303 err = PTR_ERR(ops);
4304 goto err1;
4305 }
4306 } else {
4307 ops = type->ops;
4308 }
4309
e5009240 4310 err = -ENOMEM;
dfc46034 4311 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
e5009240
PNA		 4312 if (obj == NULL)
4313 goto err1;
4314
dfc46034 4315 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240
PNA		 4316 if (err < 0)
4317 goto err2;
4318
dfc46034
PBG		 4319 obj->ops = ops;
4320
e5009240
PNA		 4321 return obj;
4322err2:
4323 kfree(obj);
4324err1:
4325 return ERR_PTR(err);
4326}
4327
4328static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4329 struct nft_object *obj, bool reset)
e5009240
PNA		 4330{
4331 struct nlattr *nest;
4332
4333 nest = nla_nest_start(skb, attr);
4334 if (!nest)
4335 goto nla_put_failure;
dfc46034 4336 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 4337 goto nla_put_failure;
4338 nla_nest_end(skb, nest);
4339 return 0;
4340
4341nla_put_failure:
4342 return -1;
4343}
4344
4345static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4346{
4347 const struct nft_object_type *type;
4348
4349 list_for_each_entry(type, &nf_tables_objects, list) {
4350 if (objtype == type->type)
4351 return type;
4352 }
4353 return NULL;
4354}
4355
4356static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4357{
4358 const struct nft_object_type *type;
4359
4360 type = __nft_obj_type_get(objtype);
4361 if (type != NULL && try_module_get(type->owner))
4362 return type;
4363
4364#ifdef CONFIG_MODULES
4365 if (type == NULL) {
4366 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4367 request_module("nft-obj-%u", objtype);
4368 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4369 if (__nft_obj_type_get(objtype))
4370 return ERR_PTR(-EAGAIN);
4371 }
4372#endif
4373 return ERR_PTR(-ENOENT);
4374}
4375
4376static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4377 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4378 const struct nlattr * const nla[],
4379 struct netlink_ext_ack *extack)
e5009240
PNA		 4380{
4381 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4382 const struct nft_object_type *type;
4383 u8 genmask = nft_genmask_next(net);
4384 int family = nfmsg->nfgen_family;
4385 struct nft_af_info *afi;
4386 struct nft_table *table;
4387 struct nft_object *obj;
4388 struct nft_ctx ctx;
4389 u32 objtype;
4390 int err;
4391
4392 if (!nla[NFTA_OBJ_TYPE] ||
4393 !nla[NFTA_OBJ_NAME] ||
4394 !nla[NFTA_OBJ_DATA])
4395 return -EINVAL;
4396
4397 afi = nf_tables_afinfo_lookup(net, family, true);
4398 if (IS_ERR(afi))
4399 return PTR_ERR(afi);
4400
4401 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4402 if (IS_ERR(table))
4403 return PTR_ERR(table);
4404
4405 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4406 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4407 if (IS_ERR(obj)) {
4408 err = PTR_ERR(obj);
4409 if (err != -ENOENT)
4410 return err;
4411
1a28ad74 4412 } else {
e5009240
PNA		 4413 if (nlh->nlmsg_flags & NLM_F_EXCL)
4414 return -EEXIST;
4415
4416 return 0;
4417 }
4418
4419 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4420
4421 type = nft_obj_type_get(objtype);
4422 if (IS_ERR(type))
4423 return PTR_ERR(type);
4424
84fba055 4425 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4426 if (IS_ERR(obj)) {
4427 err = PTR_ERR(obj);
4428 goto err1;
4429 }
18965317 4430 obj->table = table;
61509575
PS		 4431 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4432 if (!obj->name) {
4433 err = -ENOMEM;
4434 goto err2;
4435 }
e5009240
PNA		 4436
4437 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4438 if (err < 0)
61509575 4439 goto err3;
e5009240
PNA		 4440
4441 list_add_tail_rcu(&obj->list, &table->objects);
4442 table->use++;
4443 return 0;
61509575
PS		 4444err3:
4445 kfree(obj->name);
e5009240 4446err2:
dfc46034
PBG		 4447 if (obj->ops->destroy)
4448 obj->ops->destroy(obj);
e5009240
PNA		 4449 kfree(obj);
4450err1:
4451 module_put(type->owner);
4452 return err;
4453}
4454
4455static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4456 u32 portid, u32 seq, int event, u32 flags,
4457 int family, const struct nft_table *table,
43da04a5 4458 struct nft_object *obj, bool reset)
e5009240
PNA		 4459{
4460 struct nfgenmsg *nfmsg;
4461 struct nlmsghdr *nlh;
4462
dedb67c4 4463 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 4464 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4465 if (nlh == NULL)
4466 goto nla_put_failure;
4467
4468 nfmsg = nlmsg_data(nlh);
4469 nfmsg->nfgen_family = family;
4470 nfmsg->version = NFNETLINK_V0;
4471 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4472
4473 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4474 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
dfc46034 4475 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 4476 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
43da04a5 4477 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
e5009240
PNA		 4478 goto nla_put_failure;
4479
4480 nlmsg_end(skb, nlh);
4481 return 0;
4482
4483nla_put_failure:
4484 nlmsg_trim(skb, nlh);
4485 return -1;
4486}
4487
a9fea2a3 4488struct nft_obj_filter {
e46abbcc 4489 char *table;
a9fea2a3
PNA		 4490 u32 type;
4491};
4492
e5009240
PNA		 4493static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4494{
4495 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4496 const struct nft_af_info *afi;
4497 const struct nft_table *table;
e5009240 4498 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 4499 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 4500 struct net *net = sock_net(skb->sk);
4501 int family = nfmsg->nfgen_family;
43da04a5
PNA		 4502 struct nft_object *obj;
4503 bool reset = false;
4504
4505 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4506 reset = true;
e5009240
PNA		 4507
4508 rcu_read_lock();
4509 cb->seq = net->nft.base_seq;
4510
4511 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4512 if (family != NFPROTO_UNSPEC && family != afi->family)
4513 continue;
4514
4515 list_for_each_entry_rcu(table, &afi->tables, list) {
4516 list_for_each_entry_rcu(obj, &table->objects, list) {
4517 if (!nft_is_active(net, obj))
4518 goto cont;
4519 if (idx < s_idx)
4520 goto cont;
4521 if (idx > s_idx)
4522 memset(&cb->args[1], 0,
4523 sizeof(cb->args) - sizeof(cb->args[0]));
d21e540b 4524 if (filter && filter->table[0] &&
a9fea2a3
PNA		 4525 strcmp(filter->table, table->name))
4526 goto cont;
d21e540b
LZ		 4527 if (filter &&
4528 filter->type != NFT_OBJECT_UNSPEC &&
dfc46034 4529 obj->ops->type->type != filter->type)
a9fea2a3
PNA		 4530 goto cont;
4531
e5009240
PNA		 4532 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4533 cb->nlh->nlmsg_seq,
4534 NFT_MSG_NEWOBJ,
4535 NLM_F_MULTI | NLM_F_APPEND,
43da04a5 4536 afi->family, table, obj, reset) < 0)
e5009240
PNA		 4537 goto done;
4538
4539 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4540cont:
4541 idx++;
4542 }
4543 }
4544 }
4545done:
4546 rcu_read_unlock();
4547
4548 cb->args[0] = idx;
4549 return skb->len;
4550}
4551
a9fea2a3
PNA		 4552static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4553{
e46abbcc
PS		 4554 struct nft_obj_filter *filter = cb->data;
4555
4556 kfree(filter->table);
4557 kfree(filter);
a9fea2a3
PNA		 4558
4559 return 0;
4560}
4561
4562static struct nft_obj_filter *
4563nft_obj_filter_alloc(const struct nlattr * const nla[])
4564{
4565 struct nft_obj_filter *filter;
4566
4567 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4568 if (!filter)
4569 return ERR_PTR(-ENOMEM);
4570
e46abbcc
PS		 4571 if (nla[NFTA_OBJ_TABLE]) {
4572 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4573 if (!filter->table) {
4574 kfree(filter);
4575 return ERR_PTR(-ENOMEM);
4576 }
4577 }
a9fea2a3
PNA		 4578 if (nla[NFTA_OBJ_TYPE])
4579 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4580
4581 return filter;
4582}
4583
e5009240
PNA		 4584static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4585 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4586 const struct nlattr * const nla[],
4587 struct netlink_ext_ack *extack)
e5009240
PNA		 4588{
4589 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4590 u8 genmask = nft_genmask_cur(net);
4591 int family = nfmsg->nfgen_family;
4592 const struct nft_af_info *afi;
4593 const struct nft_table *table;
4594 struct nft_object *obj;
4595 struct sk_buff *skb2;
43da04a5 4596 bool reset = false;
e5009240
PNA		 4597 u32 objtype;
4598 int err;
4599
4600 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4601 struct netlink_dump_control c = {
4602 .dump = nf_tables_dump_obj,
a9fea2a3 4603 .done = nf_tables_dump_obj_done,
e5009240 4604 };
a9fea2a3
PNA		 4605
4606 if (nla[NFTA_OBJ_TABLE] ||
4607 nla[NFTA_OBJ_TYPE]) {
4608 struct nft_obj_filter *filter;
4609
4610 filter = nft_obj_filter_alloc(nla);
4611 if (IS_ERR(filter))
4612 return -ENOMEM;
4613
4614 c.data = filter;
4615 }
e5009240
PNA		 4616 return netlink_dump_start(nlsk, skb, nlh, &c);
4617 }
4618
4619 if (!nla[NFTA_OBJ_NAME] ||
4620 !nla[NFTA_OBJ_TYPE])
4621 return -EINVAL;
4622
4623 afi = nf_tables_afinfo_lookup(net, family, false);
4624 if (IS_ERR(afi))
4625 return PTR_ERR(afi);
4626
4627 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4628 if (IS_ERR(table))
4629 return PTR_ERR(table);
4630
4631 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4632 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4633 if (IS_ERR(obj))
4634 return PTR_ERR(obj);
4635
4636 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4637 if (!skb2)
4638 return -ENOMEM;
4639
43da04a5
PNA		 4640 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4641 reset = true;
4642
e5009240
PNA		 4643 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4644 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 4645 family, table, obj, reset);
e5009240
PNA		 4646 if (err < 0)
4647 goto err;
4648
4649 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4650err:
4651 kfree_skb(skb2);
4652 return err;
e5009240
PNA		 4653}
4654
4655static void nft_obj_destroy(struct nft_object *obj)
4656{
dfc46034
PBG		 4657 if (obj->ops->destroy)
4658 obj->ops->destroy(obj);
e5009240 4659
dfc46034 4660 module_put(obj->ops->type->owner);
61509575 4661 kfree(obj->name);
e5009240
PNA		 4662 kfree(obj);
4663}
4664
4665static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 4666 struct sk_buff *skb, const struct nlmsghdr *nlh,
4667 const struct nlattr * const nla[],
4668 struct netlink_ext_ack *extack)
e5009240
PNA		 4669{
4670 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4671 u8 genmask = nft_genmask_next(net);
4672 int family = nfmsg->nfgen_family;
4673 struct nft_af_info *afi;
4674 struct nft_table *table;
4675 struct nft_object *obj;
4676 struct nft_ctx ctx;
4677 u32 objtype;
4678
4679 if (!nla[NFTA_OBJ_TYPE] ||
4680 !nla[NFTA_OBJ_NAME])
4681 return -EINVAL;
4682
4683 afi = nf_tables_afinfo_lookup(net, family, true);
4684 if (IS_ERR(afi))
4685 return PTR_ERR(afi);
4686
4687 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4688 if (IS_ERR(table))
4689 return PTR_ERR(table);
4690
4691 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4692 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4693 if (IS_ERR(obj))
4694 return PTR_ERR(obj);
4695 if (obj->use > 0)
4696 return -EBUSY;
4697
4698 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4699
4700 return nft_delobj(&ctx, obj);
4701}
4702
25e94a99
PNA		 4703void nft_obj_notify(struct net *net, struct nft_table *table,
4704 struct nft_object *obj, u32 portid, u32 seq, int event,
4705 int family, int report, gfp_t gfp)
e5009240
PNA		 4706{
4707 struct sk_buff *skb;
4708 int err;
4709
2599e989
PNA		 4710 if (!report &&
4711 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4712 return;
e5009240 4713
2599e989 4714 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 4715 if (skb == NULL)
4716 goto err;
4717
2599e989
PNA		 4718 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4719 table, obj, false);
e5009240
PNA		 4720 if (err < 0) {
4721 kfree_skb(skb);
4722 goto err;
4723 }
4724
25e94a99
PNA		 4725 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4726 return;
e5009240 4727err:
25e94a99 4728 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 4729}
2599e989
PNA		 4730EXPORT_SYMBOL_GPL(nft_obj_notify);
4731
25e94a99
PNA		 4732static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4733 struct nft_object *obj, int event)
2599e989 4734{
25e94a99
PNA		 4735 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4736 ctx->afi->family, ctx->report, GFP_KERNEL);
2599e989 4737}
e5009240 4738
84d7fce6
PNA		 4739static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
4740 u32 portid, u32 seq)
4741{
4742 struct nlmsghdr *nlh;
4743 struct nfgenmsg *nfmsg;
784b4e61 4744 char buf[TASK_COMM_LEN];
dedb67c4 4745 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 4746
4747 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
4748 if (nlh == NULL)
4749 goto nla_put_failure;
4750
4751 nfmsg = nlmsg_data(nlh);
4752 nfmsg->nfgen_family = AF_UNSPEC;
4753 nfmsg->version = NFNETLINK_V0;
4754 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4755
784b4e61
PS		 4756 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
4757 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
4758 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 4759 goto nla_put_failure;
4760
053c095a
JB		 4761 nlmsg_end(skb, nlh);
4762 return 0;
84d7fce6
PNA		 4763
4764nla_put_failure:
4765 nlmsg_trim(skb, nlh);
4766 return -EMSGSIZE;
4767}
4768
25e94a99
PNA		 4769static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
4770 int event)
84d7fce6
PNA		 4771{
4772 struct nlmsghdr *nlh = nlmsg_hdr(skb);
4773 struct sk_buff *skb2;
4774 int err;
4775
4776 if (nlmsg_report(nlh) &&
4777 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4778 return;
84d7fce6 4779
84d7fce6
PNA		 4780 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4781 if (skb2 == NULL)
4782 goto err;
4783
4784 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4785 nlh->nlmsg_seq);
4786 if (err < 0) {
4787 kfree_skb(skb2);
4788 goto err;
4789 }
4790
25e94a99
PNA		 4791 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4792 nlmsg_report(nlh), GFP_KERNEL);
4793 return;
84d7fce6 4794err:
25e94a99
PNA		 4795 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
4796 -ENOBUFS);
84d7fce6
PNA		 4797}
4798
7b8002a1
PNA		 4799static int nf_tables_getgen(struct net *net, struct sock *nlsk,
4800 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4801 const struct nlattr * const nla[],
4802 struct netlink_ext_ack *extack)
84d7fce6 4803{
84d7fce6
PNA		 4804 struct sk_buff *skb2;
4805 int err;
4806
4807 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4808 if (skb2 == NULL)
4809 return -ENOMEM;
4810
4811 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
4812 nlh->nlmsg_seq);
4813 if (err < 0)
4814 goto err;
4815
4816 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4817err:
4818 kfree_skb(skb2);
4819 return err;
4820}
4821
96518518
PM		 4822static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
4823 [NFT_MSG_NEWTABLE] = {
55dd6f93 4824 .call_batch = nf_tables_newtable,
96518518
PM		 4825 .attr_count = NFTA_TABLE_MAX,
4826 .policy = nft_table_policy,
4827 },
4828 [NFT_MSG_GETTABLE] = {
4829 .call = nf_tables_gettable,
4830 .attr_count = NFTA_TABLE_MAX,
4831 .policy = nft_table_policy,
4832 },
4833 [NFT_MSG_DELTABLE] = {
55dd6f93 4834 .call_batch = nf_tables_deltable,
96518518
PM		 4835 .attr_count = NFTA_TABLE_MAX,
4836 .policy = nft_table_policy,
4837 },
4838 [NFT_MSG_NEWCHAIN] = {
91c7b38d 4839 .call_batch = nf_tables_newchain,
96518518
PM		 4840 .attr_count = NFTA_CHAIN_MAX,
4841 .policy = nft_chain_policy,
4842 },
4843 [NFT_MSG_GETCHAIN] = {
4844 .call = nf_tables_getchain,
4845 .attr_count = NFTA_CHAIN_MAX,
4846 .policy = nft_chain_policy,
4847 },
4848 [NFT_MSG_DELCHAIN] = {
91c7b38d 4849 .call_batch = nf_tables_delchain,
96518518
PM		 4850 .attr_count = NFTA_CHAIN_MAX,
4851 .policy = nft_chain_policy,
4852 },
4853 [NFT_MSG_NEWRULE] = {
0628b123 4854 .call_batch = nf_tables_newrule,
96518518
PM		 4855 .attr_count = NFTA_RULE_MAX,
4856 .policy = nft_rule_policy,
4857 },
4858 [NFT_MSG_GETRULE] = {
4859 .call = nf_tables_getrule,
4860 .attr_count = NFTA_RULE_MAX,
4861 .policy = nft_rule_policy,
4862 },
4863 [NFT_MSG_DELRULE] = {
0628b123 4864 .call_batch = nf_tables_delrule,
96518518
PM		 4865 .attr_count = NFTA_RULE_MAX,
4866 .policy = nft_rule_policy,
4867 },
20a69341 4868 [NFT_MSG_NEWSET] = {
958bee14 4869 .call_batch = nf_tables_newset,
20a69341
PM		 4870 .attr_count = NFTA_SET_MAX,
4871 .policy = nft_set_policy,
4872 },
4873 [NFT_MSG_GETSET] = {
4874 .call = nf_tables_getset,
4875 .attr_count = NFTA_SET_MAX,
4876 .policy = nft_set_policy,
4877 },
4878 [NFT_MSG_DELSET] = {
958bee14 4879 .call_batch = nf_tables_delset,
20a69341
PM		 4880 .attr_count = NFTA_SET_MAX,
4881 .policy = nft_set_policy,
4882 },
4883 [NFT_MSG_NEWSETELEM] = {
958bee14 4884 .call_batch = nf_tables_newsetelem,
20a69341
PM		 4885 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4886 .policy = nft_set_elem_list_policy,
4887 },
4888 [NFT_MSG_GETSETELEM] = {
4889 .call = nf_tables_getsetelem,
4890 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4891 .policy = nft_set_elem_list_policy,
4892 },
4893 [NFT_MSG_DELSETELEM] = {
958bee14 4894 .call_batch = nf_tables_delsetelem,
20a69341
PM		 4895 .attr_count = NFTA_SET_ELEM_LIST_MAX,
4896 .policy = nft_set_elem_list_policy,
4897 },
84d7fce6
PNA		 4898 [NFT_MSG_GETGEN] = {
4899 .call = nf_tables_getgen,
4900 },
e5009240
PNA		 4901 [NFT_MSG_NEWOBJ] = {
4902 .call_batch = nf_tables_newobj,
4903 .attr_count = NFTA_OBJ_MAX,
4904 .policy = nft_obj_policy,
4905 },
4906 [NFT_MSG_GETOBJ] = {
4907 .call = nf_tables_getobj,
4908 .attr_count = NFTA_OBJ_MAX,
4909 .policy = nft_obj_policy,
4910 },
4911 [NFT_MSG_DELOBJ] = {
4912 .call_batch = nf_tables_delobj,
4913 .attr_count = NFTA_OBJ_MAX,
4914 .policy = nft_obj_policy,
4915 },
43da04a5
PNA		 4916 [NFT_MSG_GETOBJ_RESET] = {
4917 .call = nf_tables_getobj,
4918 .attr_count = NFTA_OBJ_MAX,
4919 .policy = nft_obj_policy,
4920 },
96518518
PM		 4921};
4922
91c7b38d
PNA		 4923static void nft_chain_commit_update(struct nft_trans *trans)
4924{
4925 struct nft_base_chain *basechain;
4926
b7263e07 4927 if (nft_trans_chain_name(trans))
91c7b38d
PNA		 4928 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
4929
f323d954 4930 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 4931 return;
4932
4933 basechain = nft_base_chain(trans->ctx.chain);
4934 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
4935
4936 switch (nft_trans_chain_policy(trans)) {
4937 case NF_DROP:
4938 case NF_ACCEPT:
4939 basechain->policy = nft_trans_chain_policy(trans);
4940 break;
4941 }
4942}
4943
b326dd37 4944static void nf_tables_commit_release(struct nft_trans *trans)
c7c32e72 4945{
c7c32e72
PNA		 4946 switch (trans->msg_type) {
4947 case NFT_MSG_DELTABLE:
4948 nf_tables_table_destroy(&trans->ctx);
4949 break;
4950 case NFT_MSG_DELCHAIN:
4951 nf_tables_chain_destroy(trans->ctx.chain);
4952 break;
4953 case NFT_MSG_DELRULE:
4954 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
4955 break;
4956 case NFT_MSG_DELSET:
4957 nft_set_destroy(nft_trans_set(trans));
4958 break;
61edafbb 4959 case NFT_MSG_DELSETELEM:
59105446
PNA		 4960 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
4961 nft_trans_elem(trans).priv);
61edafbb 4962 break;
e5009240
PNA		 4963 case NFT_MSG_DELOBJ:
4964 nft_obj_destroy(nft_trans_obj(trans));
4965 break;
c7c32e72
PNA		 4966 }
4967 kfree(trans);
4968}
4969
5913beaf 4970static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 4971{
37082f93 4972 struct nft_trans *trans, *next;
a3716e70 4973 struct nft_trans_elem *te;
37082f93
PNA		 4974
4975 /* Bump generation counter, invalidate any dump in progress */
38e029f1 4976 while (++net->nft.base_seq == 0);
37082f93
PNA		 4977
4978 /* A new generation has just started */
ea4bd995 4979 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 4980
4981 /* Make sure all packets have left the previous generation before
4982 * purging old rules.
4983 */
4984 synchronize_rcu();
4985
4986 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 4987 switch (trans->msg_type) {
55dd6f93
PNA		 4988 case NFT_MSG_NEWTABLE:
4989 if (nft_trans_table_update(trans)) {
4990 if (!nft_trans_table_enable(trans)) {
664b0f8c
PNA		 4991 nf_tables_table_disable(net,
4992 trans->ctx.afi,
55dd6f93
PNA		 4993 trans->ctx.table);
4994 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
4995 }
4996 } else {
f2a6d766 4997 nft_clear(net, trans->ctx.table);
55dd6f93 4998 }
35151d84 4999 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 5000 nft_trans_destroy(trans);
5001 break;
5002 case NFT_MSG_DELTABLE:
f2a6d766 5003 list_del_rcu(&trans->ctx.table->list);
35151d84 5004 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 5005 break;
91c7b38d
PNA		 5006 case NFT_MSG_NEWCHAIN:
5007 if (nft_trans_chain_update(trans))
5008 nft_chain_commit_update(trans);
4fefee57 5009 else
664b0f8c 5010 nft_clear(net, trans->ctx.chain);
4fefee57 5011
35151d84 5012 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
91c7b38d
PNA		 5013 nft_trans_destroy(trans);
5014 break;
5015 case NFT_MSG_DELCHAIN:
664b0f8c 5016 list_del_rcu(&trans->ctx.chain->list);
35151d84 5017 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
82bec71d
PNA		 5018 nf_tables_unregister_hooks(trans->ctx.net,
5019 trans->ctx.table,
c5598794
AB		 5020 trans->ctx.chain,
5021 trans->ctx.afi->nops);
91c7b38d 5022 break;
b380e5c7 5023 case NFT_MSG_NEWRULE:
889f7ee7 5024 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 5025 nf_tables_rule_notify(&trans->ctx,
37082f93 5026 nft_trans_rule(trans),
35151d84 5027 NFT_MSG_NEWRULE);
37082f93 5028 nft_trans_destroy(trans);
b380e5c7
PNA		 5029 break;
5030 case NFT_MSG_DELRULE:
5031 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 5032 nf_tables_rule_notify(&trans->ctx,
5033 nft_trans_rule(trans),
5034 NFT_MSG_DELRULE);
b380e5c7 5035 break;
958bee14 5036 case NFT_MSG_NEWSET:
37a9cc52 5037 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 5038 /* This avoids hitting -EBUSY when deleting the table
5039 * from the transaction.
5040 */
5041 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
5042 !list_empty(&nft_trans_set(trans)->bindings))
5043 trans->ctx.table->use--;
5044
958bee14 5045 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 5046 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 5047 nft_trans_destroy(trans);
5048 break;
5049 case NFT_MSG_DELSET:
37a9cc52 5050 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 5051 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 5052 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 5053 break;
60319eb1 5054 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 5055 te = (struct nft_trans_elem *)trans->data;
5056
42a55769 5057 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 5058 nf_tables_setelem_notify(&trans->ctx, te->set,
5059 &te->elem,
60319eb1
PNA		 5060 NFT_MSG_NEWSETELEM, 0);
5061 nft_trans_destroy(trans);
5062 break;
5063 case NFT_MSG_DELSETELEM:
a3716e70 5064 te = (struct nft_trans_elem *)trans->data;
fe2811eb 5065
a3716e70
PNA		 5066 nf_tables_setelem_notify(&trans->ctx, te->set,
5067 &te->elem,
60319eb1 5068 NFT_MSG_DELSETELEM, 0);
5cb82a38 5069 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 5070 atomic_dec(&te->set->nelems);
5071 te->set->ndeact--;
60319eb1 5072 break;
e5009240
PNA		 5073 case NFT_MSG_NEWOBJ:
5074 nft_clear(net, nft_trans_obj(trans));
5075 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5076 NFT_MSG_NEWOBJ);
5077 nft_trans_destroy(trans);
5078 break;
5079 case NFT_MSG_DELOBJ:
5080 list_del_rcu(&nft_trans_obj(trans)->list);
5081 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5082 NFT_MSG_DELOBJ);
5083 break;
37082f93 5084 }
37082f93
PNA		 5085 }
5086
b326dd37
PNA		 5087 synchronize_rcu();
5088
37082f93 5089 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
c7c32e72 5090 list_del(&trans->list);
b326dd37 5091 nf_tables_commit_release(trans);
37082f93 5092 }
84d7fce6
PNA		 5093
5094 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
37082f93
PNA		 5095
5096 return 0;
5097}
5098
b326dd37 5099static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 5100{
c7c32e72
PNA		 5101 switch (trans->msg_type) {
5102 case NFT_MSG_NEWTABLE:
5103 nf_tables_table_destroy(&trans->ctx);
5104 break;
5105 case NFT_MSG_NEWCHAIN:
5106 nf_tables_chain_destroy(trans->ctx.chain);
5107 break;
5108 case NFT_MSG_NEWRULE:
5109 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5110 break;
5111 case NFT_MSG_NEWSET:
5112 nft_set_destroy(nft_trans_set(trans));
5113 break;
61edafbb
PM		 5114 case NFT_MSG_NEWSETELEM:
5115 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 5116 nft_trans_elem(trans).priv, true);
61edafbb 5117 break;
e5009240
PNA		 5118 case NFT_MSG_NEWOBJ:
5119 nft_obj_destroy(nft_trans_obj(trans));
5120 break;
c7c32e72
PNA		 5121 }
5122 kfree(trans);
5123}
5124
5913beaf 5125static int nf_tables_abort(struct net *net, struct sk_buff *skb)
37082f93 5126{
37082f93 5127 struct nft_trans *trans, *next;
02263db0 5128 struct nft_trans_elem *te;
37082f93 5129
a907e36d
XL		 5130 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5131 list) {
b380e5c7 5132 switch (trans->msg_type) {
55dd6f93
PNA		 5133 case NFT_MSG_NEWTABLE:
5134 if (nft_trans_table_update(trans)) {
5135 if (nft_trans_table_enable(trans)) {
664b0f8c
PNA		 5136 nf_tables_table_disable(net,
5137 trans->ctx.afi,
55dd6f93
PNA		 5138 trans->ctx.table);
5139 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5140 }
5141 nft_trans_destroy(trans);
5142 } else {
e688a7f8 5143 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 5144 }
5145 break;
5146 case NFT_MSG_DELTABLE:
f2a6d766 5147 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 5148 nft_trans_destroy(trans);
5149 break;
91c7b38d
PNA		 5150 case NFT_MSG_NEWCHAIN:
5151 if (nft_trans_chain_update(trans)) {
982f4051 5152 free_percpu(nft_trans_chain_stats(trans));
91c7b38d
PNA		 5153
5154 nft_trans_destroy(trans);
5155 } else {
4fefee57 5156 trans->ctx.table->use--;
e688a7f8 5157 list_del_rcu(&trans->ctx.chain->list);
82bec71d
PNA		 5158 nf_tables_unregister_hooks(trans->ctx.net,
5159 trans->ctx.table,
c5598794
AB		 5160 trans->ctx.chain,
5161 trans->ctx.afi->nops);
91c7b38d
PNA		 5162 }
5163 break;
5164 case NFT_MSG_DELCHAIN:
4fefee57 5165 trans->ctx.table->use++;
664b0f8c 5166 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 5167 nft_trans_destroy(trans);
5168 break;
b380e5c7 5169 case NFT_MSG_NEWRULE:
4fefee57 5170 trans->ctx.chain->use--;
b380e5c7
PNA		 5171 list_del_rcu(&nft_trans_rule(trans)->list);
5172 break;
5173 case NFT_MSG_DELRULE:
4fefee57 5174 trans->ctx.chain->use++;
889f7ee7 5175 nft_clear(trans->ctx.net, nft_trans_rule(trans));
37082f93 5176 nft_trans_destroy(trans);
b380e5c7 5177 break;
958bee14 5178 case NFT_MSG_NEWSET:
4fefee57 5179 trans->ctx.table->use--;
e688a7f8 5180 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 5181 break;
5182 case NFT_MSG_DELSET:
4fefee57 5183 trans->ctx.table->use++;
37a9cc52 5184 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 5185 nft_trans_destroy(trans);
5186 break;
60319eb1 5187 case NFT_MSG_NEWSETELEM:
02263db0 5188 te = (struct nft_trans_elem *)trans->data;
fe2811eb 5189
5cb82a38 5190 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 5191 atomic_dec(&te->set->nelems);
60319eb1
PNA		 5192 break;
5193 case NFT_MSG_DELSETELEM:
cc02e457
PM		 5194 te = (struct nft_trans_elem *)trans->data;
5195
59105446 5196 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 5197 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 5198 te->set->ndeact--;
cc02e457 5199
e5009240
PNA		 5200 nft_trans_destroy(trans);
5201 break;
5202 case NFT_MSG_NEWOBJ:
5203 trans->ctx.table->use--;
5204 list_del_rcu(&nft_trans_obj(trans)->list);
5205 break;
5206 case NFT_MSG_DELOBJ:
5207 trans->ctx.table->use++;
5208 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 5209 nft_trans_destroy(trans);
5210 break;
37082f93 5211 }
37082f93
PNA		 5212 }
5213
b326dd37
PNA		 5214 synchronize_rcu();
5215
a1cee076
PNA		 5216 list_for_each_entry_safe_reverse(trans, next,
5217 &net->nft.commit_list, list) {
c7c32e72 5218 list_del(&trans->list);
b326dd37 5219 nf_tables_abort_release(trans);
37082f93
PNA		 5220 }
5221
5222 return 0;
5223}
5224
74e8bcd2
PNA		 5225static bool nf_tables_valid_genid(struct net *net, u32 genid)
5226{
5227 return net->nft.base_seq == genid;
5228}
5229
96518518
PM		 5230static const struct nfnetlink_subsystem nf_tables_subsys = {
5231 .name = "nf_tables",
5232 .subsys_id = NFNL_SUBSYS_NFTABLES,
5233 .cb_count = NFT_MSG_MAX,
5234 .cb = nf_tables_cb,
0628b123
PNA		 5235 .commit = nf_tables_commit,
5236 .abort = nf_tables_abort,
74e8bcd2 5237 .valid_genid = nf_tables_valid_genid,
96518518
PM		 5238};
5239
7210e4e3
PNA		 5240int nft_chain_validate_dependency(const struct nft_chain *chain,
5241 enum nft_chain_type type)
5242{
5243 const struct nft_base_chain *basechain;
5244
f323d954 5245 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 5246 basechain = nft_base_chain(chain);
5247 if (basechain->type->type != type)
5248 return -EOPNOTSUPP;
5249 }
5250 return 0;
5251}
5252EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
5253
75e8d06d
PNA		 5254int nft_chain_validate_hooks(const struct nft_chain *chain,
5255 unsigned int hook_flags)
5256{
5257 struct nft_base_chain *basechain;
5258
f323d954 5259 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 5260 basechain = nft_base_chain(chain);
5261
5262 if ((1 << basechain->ops[0].hooknum) & hook_flags)
5263 return 0;
5264
5265 return -EOPNOTSUPP;
5266 }
5267
5268 return 0;
5269}
5270EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
5271
20a69341
PM		 5272/*
5273 * Loop detection - walk through the ruleset beginning at the destination chain
5274 * of a new jump until either the source chain is reached (loop) or all
5275 * reachable chains have been traversed.
5276 *
5277 * The loop check is performed whenever a new jump verdict is added to an
5278 * expression or verdict map or a verdict map is bound to a new chain.
5279 */
5280
5281static int nf_tables_check_loops(const struct nft_ctx *ctx,
5282 const struct nft_chain *chain);
5283
5284static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 5285 struct nft_set *set,
20a69341 5286 const struct nft_set_iter *iter,
de70185d 5287 struct nft_set_elem *elem)
20a69341 5288{
fe2811eb
PM		 5289 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5290 const struct nft_data *data;
5291
5292 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5293 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 5294 return 0;
5295
fe2811eb 5296 data = nft_set_ext_data(ext);
1ca2e170 5297 switch (data->verdict.code) {
20a69341
PM		 5298 case NFT_JUMP:
5299 case NFT_GOTO:
1ca2e170 5300 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5301 default:
5302 return 0;
5303 }
5304}
5305
5306static int nf_tables_check_loops(const struct nft_ctx *ctx,
5307 const struct nft_chain *chain)
5308{
5309 const struct nft_rule *rule;
5310 const struct nft_expr *expr, *last;
de70185d 5311 struct nft_set *set;
20a69341
PM		 5312 struct nft_set_binding *binding;
5313 struct nft_set_iter iter;
20a69341
PM		 5314
5315 if (ctx->chain == chain)
5316 return -ELOOP;
5317
5318 list_for_each_entry(rule, &chain->rules, list) {
5319 nft_rule_for_each_expr(expr, last, rule) {
0ca743a5
PNA		 5320 const struct nft_data *data = NULL;
5321 int err;
5322
5323 if (!expr->ops->validate)
20a69341
PM		 5324 continue;
5325
0ca743a5
PNA		 5326 err = expr->ops->validate(ctx, expr, &data);
5327 if (err < 0)
5328 return err;
5329
20a69341 5330 if (data == NULL)
0ca743a5 5331 continue;
20a69341 5332
1ca2e170 5333 switch (data->verdict.code) {
20a69341
PM		 5334 case NFT_JUMP:
5335 case NFT_GOTO:
1ca2e170
PM		 5336 err = nf_tables_check_loops(ctx,
5337 data->verdict.chain);
20a69341
PM		 5338 if (err < 0)
5339 return err;
5340 default:
5341 break;
5342 }
5343 }
5344 }
5345
5346 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 5347 if (!nft_is_active_next(ctx->net, set))
5348 continue;
20a69341
PM		 5349 if (!(set->flags & NFT_SET_MAP) ||
5350 set->dtype != NFT_DATA_VERDICT)
5351 continue;
5352
5353 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 5354 if (!(binding->flags & NFT_SET_MAP) ||
5355 binding->chain != chain)
20a69341
PM		 5356 continue;
5357
8588ac09 5358 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 5359 iter.skip = 0;
5360 iter.count = 0;
5361 iter.err = 0;
5362 iter.fn = nf_tables_loop_check_setelem;
5363
5364 set->ops->walk(ctx, set, &iter);
5365 if (iter.err < 0)
5366 return iter.err;
5367 }
5368 }
5369
5370 return 0;
5371}
5372
36b701fa
LGL		 5373/**
5374 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
5375 *
5376 * @attr: netlink attribute to fetch value from
5377 * @max: maximum value to be stored in dest
5378 * @dest: pointer to the variable
5379 *
5380 * Parse, check and store a given u32 netlink attribute into variable.
5381 * This function returns -ERANGE if the value goes over maximum value.
5382 * Otherwise a 0 is returned and the attribute value is stored in the
5383 * destination variable.
5384 */
f1d505bb 5385int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 5386{
09525a09 5387 u32 val;
36b701fa
LGL		 5388
5389 val = ntohl(nla_get_be32(attr));
5390 if (val > max)
5391 return -ERANGE;
5392
5393 *dest = val;
5394 return 0;
5395}
5396EXPORT_SYMBOL_GPL(nft_parse_u32_check);
5397
49499c3e
PM		 5398/**
5399 * nft_parse_register - parse a register value from a netlink attribute
5400 *
5401 * @attr: netlink attribute
5402 *
5403 * Parse and translate a register value from a netlink attribute.
5404 * Registers used to be 128 bit wide, these register numbers will be
5405 * mapped to the corresponding 32 bit register numbers.
5406 */
b1c96ed3
PM		 5407unsigned int nft_parse_register(const struct nlattr *attr)
5408{
49499c3e
PM		 5409 unsigned int reg;
5410
5411 reg = ntohl(nla_get_be32(attr));
5412 switch (reg) {
5413 case NFT_REG_VERDICT...NFT_REG_4:
5414 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
5415 default:
5416 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
5417 }
b1c96ed3
PM		 5418}
5419EXPORT_SYMBOL_GPL(nft_parse_register);
5420
49499c3e
PM		 5421/**
5422 * nft_dump_register - dump a register value to a netlink attribute
5423 *
5424 * @skb: socket buffer
5425 * @attr: attribute number
5426 * @reg: register number
5427 *
5428 * Construct a netlink attribute containing the register number. For
5429 * compatibility reasons, register numbers being a multiple of 4 are
5430 * translated to the corresponding 128 bit register numbers.
5431 */
b1c96ed3
PM		 5432int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
5433{
49499c3e
PM		 5434 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
5435 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
5436 else
5437 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
5438
b1c96ed3
PM		 5439 return nla_put_be32(skb, attr, htonl(reg));
5440}
5441EXPORT_SYMBOL_GPL(nft_dump_register);
5442
96518518 5443/**
d07db988 5444 * nft_validate_register_load - validate a load from a register
96518518
PM		 5445 *
5446 * @reg: the register number
d07db988 5447 * @len: the length of the data
96518518
PM		 5448 *
5449 * Validate that the input register is one of the general purpose
d07db988 5450 * registers and that the length of the load is within the bounds.
96518518 5451 */
d07db988 5452int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 5453{
49499c3e 5454 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 5455 return -EINVAL;
d07db988
PM		 5456 if (len == 0)
5457 return -EINVAL;
49499c3e 5458 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 5459 return -ERANGE;
49499c3e 5460
96518518
PM		 5461 return 0;
5462}
d07db988 5463EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 5464
96518518 5465/**
1ec10212 5466 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 5467 *
5468 * @ctx: context of the expression performing the load
5469 * @reg: the destination register number
5470 * @data: the data to load
5471 * @type: the data type
45d9bcda 5472 * @len: the length of the data
96518518
PM		 5473 *
5474 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 5475 * the destination register and the length is within the bounds.
5476 * A value of NULL for the data means that its runtime gathered
58f40ab6 5477 * data.
96518518 5478 */
1ec10212
PM		 5479int nft_validate_register_store(const struct nft_ctx *ctx,
5480 enum nft_registers reg,
5481 const struct nft_data *data,
5482 enum nft_data_types type, unsigned int len)
96518518 5483{
20a69341
PM		 5484 int err;
5485
96518518
PM		 5486 switch (reg) {
5487 case NFT_REG_VERDICT:
58f40ab6 5488 if (type != NFT_DATA_VERDICT)
96518518 5489 return -EINVAL;
20a69341 5490
58f40ab6 5491 if (data != NULL &&
1ca2e170
PM		 5492 (data->verdict.code == NFT_GOTO ||
5493 data->verdict.code == NFT_JUMP)) {
5494 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 5495 if (err < 0)
5496 return err;
5497
1ca2e170
PM		 5498 if (ctx->chain->level + 1 >
5499 data->verdict.chain->level) {
20a69341
PM		 5500 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
5501 return -EMLINK;
1ca2e170 5502 data->verdict.chain->level = ctx->chain->level + 1;
20a69341
PM		 5503 }
5504 }
5505
96518518
PM		 5506 return 0;
5507 default:
49499c3e 5508 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 5509 return -EINVAL;
45d9bcda
PM		 5510 if (len == 0)
5511 return -EINVAL;
49499c3e
PM		 5512 if (reg * NFT_REG32_SIZE + len >
5513 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 5514 return -ERANGE;
27e6d201 5515
96518518
PM		 5516 if (data != NULL && type != NFT_DATA_VALUE)
5517 return -EINVAL;
5518 return 0;
5519 }
5520}
1ec10212 5521EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 5522
5523static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
5524 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
5525 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
5526 .len = NFT_CHAIN_MAXNAMELEN - 1 },
5527};
5528
5529static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
5530 struct nft_data_desc *desc, const struct nlattr *nla)
5531{
664b0f8c 5532 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 5533 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
5534 struct nft_chain *chain;
5535 int err;
5536
fceb6435
JB		 5537 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
5538 NULL);
96518518
PM		 5539 if (err < 0)
5540 return err;
5541
5542 if (!tb[NFTA_VERDICT_CODE])
5543 return -EINVAL;
1ca2e170 5544 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 5545
1ca2e170 5546 switch (data->verdict.code) {
e0abdadc 5547 default:
1ca2e170 5548 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 5549 case NF_ACCEPT:
5550 case NF_DROP:
5551 case NF_QUEUE:
5552 break;
5553 default:
5554 return -EINVAL;
5555 }
5556 /* fall through */
96518518
PM		 5557 case NFT_CONTINUE:
5558 case NFT_BREAK:
5559 case NFT_RETURN:
96518518
PM		 5560 break;
5561 case NFT_JUMP:
5562 case NFT_GOTO:
5563 if (!tb[NFTA_VERDICT_CHAIN])
5564 return -EINVAL;
5565 chain = nf_tables_chain_lookup(ctx->table,
664b0f8c 5566 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 5567 if (IS_ERR(chain))
5568 return PTR_ERR(chain);
f323d954 5569 if (nft_is_base_chain(chain))
96518518
PM		 5570 return -EOPNOTSUPP;
5571
96518518 5572 chain->use++;
1ca2e170 5573 data->verdict.chain = chain;
96518518 5574 break;
96518518
PM		 5575 }
5576
4c4ed074 5577 desc->len = sizeof(data->verdict);
96518518
PM		 5578 desc->type = NFT_DATA_VERDICT;
5579 return 0;
5580}
5581
5582static void nft_verdict_uninit(const struct nft_data *data)
5583{
1ca2e170 5584 switch (data->verdict.code) {
96518518
PM		 5585 case NFT_JUMP:
5586 case NFT_GOTO:
1ca2e170 5587 data->verdict.chain->use--;
96518518
PM		 5588 break;
5589 }
5590}
5591
33d5a7b1 5592int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 5593{
5594 struct nlattr *nest;
5595
33d5a7b1 5596 nest = nla_nest_start(skb, type);
96518518
PM		 5597 if (!nest)
5598 goto nla_put_failure;
5599
33d5a7b1 5600 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 5601 goto nla_put_failure;
5602
33d5a7b1 5603 switch (v->code) {
96518518
PM		 5604 case NFT_JUMP:
5605 case NFT_GOTO:
1ca2e170 5606 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 5607 v->chain->name))
96518518
PM		 5608 goto nla_put_failure;
5609 }
5610 nla_nest_end(skb, nest);
5611 return 0;
5612
5613nla_put_failure:
5614 return -1;
5615}
5616
d0a11fc3
PM		 5617static int nft_value_init(const struct nft_ctx *ctx,
5618 struct nft_data *data, unsigned int size,
96518518
PM		 5619 struct nft_data_desc *desc, const struct nlattr *nla)
5620{
5621 unsigned int len;
5622
5623 len = nla_len(nla);
5624 if (len == 0)
5625 return -EINVAL;
d0a11fc3 5626 if (len > size)
96518518
PM		 5627 return -EOVERFLOW;
5628
d0a11fc3 5629 nla_memcpy(data->data, nla, len);
96518518
PM		 5630 desc->type = NFT_DATA_VALUE;
5631 desc->len = len;
5632 return 0;
5633}
5634
5635static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
5636 unsigned int len)
5637{
5638 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
5639}
5640
5641static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 5642 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 5643 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
5644};
5645
5646/**
5647 * nft_data_init - parse nf_tables data netlink attributes
5648 *
5649 * @ctx: context of the expression using the data
5650 * @data: destination struct nft_data
d0a11fc3 5651 * @size: maximum data length
96518518
PM		 5652 * @desc: data description
5653 * @nla: netlink attribute containing data
5654 *
5655 * Parse the netlink data attributes and initialize a struct nft_data.
5656 * The type and length of data are returned in the data description.
5657 *
5658 * The caller can indicate that it only wants to accept data of type
5659 * NFT_DATA_VALUE by passing NULL for the ctx argument.
5660 */
d0a11fc3
PM		 5661int nft_data_init(const struct nft_ctx *ctx,
5662 struct nft_data *data, unsigned int size,
96518518
PM		 5663 struct nft_data_desc *desc, const struct nlattr *nla)
5664{
5665 struct nlattr *tb[NFTA_DATA_MAX + 1];
5666 int err;
5667
fceb6435 5668 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 5669 if (err < 0)
5670 return err;
5671
5672 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 5673 return nft_value_init(ctx, data, size, desc,
5674 tb[NFTA_DATA_VALUE]);
96518518
PM		 5675 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
5676 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
5677 return -EINVAL;
5678}
5679EXPORT_SYMBOL_GPL(nft_data_init);
5680
5681/**
59105446 5682 * nft_data_release - release a nft_data item
96518518
PM		 5683 *
5684 * @data: struct nft_data to release
5685 * @type: type of data
5686 *
5687 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5688 * all others need to be released by calling this function.
5689 */
59105446 5690void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 5691{
960bd2c2 5692 if (type < NFT_DATA_VERDICT)
96518518 5693 return;
960bd2c2 5694 switch (type) {
96518518
PM		 5695 case NFT_DATA_VERDICT:
5696 return nft_verdict_uninit(data);
5697 default:
5698 WARN_ON(1);
5699 }
5700}
59105446 5701EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 5702
5703int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
5704 enum nft_data_types type, unsigned int len)
5705{
5706 struct nlattr *nest;
5707 int err;
5708
5709 nest = nla_nest_start(skb, attr);
5710 if (nest == NULL)
5711 return -1;
5712
5713 switch (type) {
5714 case NFT_DATA_VALUE:
5715 err = nft_value_dump(skb, data, len);
5716 break;
5717 case NFT_DATA_VERDICT:
33d5a7b1 5718 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 5719 break;
5720 default:
5721 err = -EINVAL;
5722 WARN_ON(1);
5723 }
5724
5725 nla_nest_end(skb, nest);
5726 return err;
5727}
5728EXPORT_SYMBOL_GPL(nft_data_dump);
5729
df05ef87 5730static int __net_init nf_tables_init_net(struct net *net)
99633ab2
PNA		 5731{
5732 INIT_LIST_HEAD(&net->nft.af_info);
0628b123 5733 INIT_LIST_HEAD(&net->nft.commit_list);
38e029f1 5734 net->nft.base_seq = 1;
99633ab2
PNA		 5735 return 0;
5736}
5737
5ebe0b0e
PNA		 5738int __nft_release_basechain(struct nft_ctx *ctx)
5739{
5740 struct nft_rule *rule, *nr;
5741
f323d954 5742 BUG_ON(!nft_is_base_chain(ctx->chain));
5ebe0b0e 5743
82bec71d 5744 nf_tables_unregister_hooks(ctx->net, ctx->chain->table, ctx->chain,
5ebe0b0e
PNA		 5745 ctx->afi->nops);
5746 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
5747 list_del(&rule->list);
5748 ctx->chain->use--;
5749 nf_tables_rule_destroy(ctx, rule);
5750 }
5751 list_del(&ctx->chain->list);
5752 ctx->table->use--;
5753 nf_tables_chain_destroy(ctx->chain);
5754
5755 return 0;
5756}
5757EXPORT_SYMBOL_GPL(__nft_release_basechain);
5758
df05ef87
PNA		 5759/* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
5760static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
5761{
5762 struct nft_table *table, *nt;
5763 struct nft_chain *chain, *nc;
e5009240 5764 struct nft_object *obj, *ne;
df05ef87
PNA		 5765 struct nft_rule *rule, *nr;
5766 struct nft_set *set, *ns;
5767 struct nft_ctx ctx = {
5768 .net = net,
5769 .afi = afi,
5770 };
5771
5772 list_for_each_entry_safe(table, nt, &afi->tables, list) {
5773 list_for_each_entry(chain, &table->chains, list)
82bec71d
PNA		 5774 nf_tables_unregister_hooks(net, table, chain,
5775 afi->nops);
df05ef87
PNA		 5776 /* No packets are walking on these chains anymore. */
5777 ctx.table = table;
5778 list_for_each_entry(chain, &table->chains, list) {
5779 ctx.chain = chain;
5780 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
5781 list_del(&rule->list);
5782 chain->use--;
5783 nf_tables_rule_destroy(&ctx, rule);
5784 }
5785 }
5786 list_for_each_entry_safe(set, ns, &table->sets, list) {
5787 list_del(&set->list);
5788 table->use--;
5789 nft_set_destroy(set);
5790 }
e5009240
PNA		 5791 list_for_each_entry_safe(obj, ne, &table->objects, list) {
5792 list_del(&obj->list);
5793 table->use--;
5794 nft_obj_destroy(obj);
5795 }
df05ef87
PNA		 5796 list_for_each_entry_safe(chain, nc, &table->chains, list) {
5797 list_del(&chain->list);
5798 table->use--;
5799 nf_tables_chain_destroy(chain);
5800 }
5801 list_del(&table->list);
5802 nf_tables_table_destroy(&ctx);
5803 }
5804}
5805
99633ab2
PNA		 5806static struct pernet_operations nf_tables_net_ops = {
5807 .init = nf_tables_init_net,
5808};
5809
96518518
PM		 5810static int __init nf_tables_module_init(void)
5811{
5812 int err;
5813
5814 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
5815 GFP_KERNEL);
5816 if (info == NULL) {
5817 err = -ENOMEM;
5818 goto err1;
5819 }
5820
5821 err = nf_tables_core_module_init();
5822 if (err < 0)
5823 goto err2;
5824
5825 err = nfnetlink_subsys_register(&nf_tables_subsys);
5826 if (err < 0)
5827 goto err3;
5828
5829 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
99633ab2 5830 return register_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 5831err3:
5832 nf_tables_core_module_exit();
5833err2:
5834 kfree(info);
5835err1:
5836 return err;
5837}
5838
5839static void __exit nf_tables_module_exit(void)
5840{
99633ab2 5841 unregister_pernet_subsys(&nf_tables_net_ops);
96518518 5842 nfnetlink_subsys_unregister(&nf_tables_subsys);
1b1bc49c 5843 rcu_barrier();
96518518
PM		 5844 nf_tables_core_module_exit();
5845 kfree(info);
5846}
5847
5848module_init(nf_tables_module_init);
5849module_exit(nf_tables_module_exit);
5850
5851MODULE_LICENSE("GPL");
5852MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
5853MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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