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netfilter: xt_RATEEST: remove netns exit routine
[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>
0eb71a9d 17#include <linux/rhashtable.h>
96518518
PM		 18#include <linux/netfilter.h>
19#include <linux/netfilter/nfnetlink.h>
20#include <linux/netfilter/nf_tables.h>
3b49e2e9 21#include <net/netfilter/nf_flow_table.h>
96518518
PM		 22#include <net/netfilter/nf_tables_core.h>
23#include <net/netfilter/nf_tables.h>
99633ab2 24#include <net/net_namespace.h>
96518518
PM		 25#include <net/sock.h>
26
96518518 27static LIST_HEAD(nf_tables_expressions);
e5009240 28static LIST_HEAD(nf_tables_objects);
3b49e2e9 29static LIST_HEAD(nf_tables_flowtables);
0935d558
FW		 30static LIST_HEAD(nf_tables_destroy_list);
31static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
3ecbfd65 32static u64 table_handle;
96518518 33
a654de8f
PNA		 34enum {
35 NFT_VALIDATE_SKIP = 0,
36 NFT_VALIDATE_NEED,
37 NFT_VALIDATE_DO,
38};
39
1b2470e5
FW		 40static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
41static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
42static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
43
44static const struct rhashtable_params nft_chain_ht_params = {
45 .head_offset = offsetof(struct nft_chain, rhlhead),
46 .key_offset = offsetof(struct nft_chain, name),
47 .hashfn = nft_chain_hash,
48 .obj_hashfn = nft_chain_hash_obj,
49 .obj_cmpfn = nft_chain_hash_cmp,
50 .locks_mul = 1,
51 .automatic_shrinking = true,
52};
53
a654de8f
PNA		 54static void nft_validate_state_update(struct net *net, u8 new_validate_state)
55{
56 switch (net->nft.validate_state) {
57 case NFT_VALIDATE_SKIP:
58 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
59 break;
60 case NFT_VALIDATE_NEED:
61 break;
62 case NFT_VALIDATE_DO:
63 if (new_validate_state == NFT_VALIDATE_NEED)
64 return;
65 }
66
67 net->nft.validate_state = new_validate_state;
68}
0935d558
FW		 69static void nf_tables_trans_destroy_work(struct work_struct *w);
70static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
a654de8f 71
7c95f6d8 72static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 73 struct net *net,
7c95f6d8
PNA		 74 const struct sk_buff *skb,
75 const struct nlmsghdr *nlh,
36596dad 76 u8 family,
7c95f6d8
PNA		 77 struct nft_table *table,
78 struct nft_chain *chain,
79 const struct nlattr * const *nla)
80{
633c9a84 81 ctx->net = net;
36596dad 82 ctx->family = family;
26b2f552 83 ctx->level = 0;
128ad332
PNA		 84 ctx->table = table;
85 ctx->chain = chain;
86 ctx->nla = nla;
87 ctx->portid = NETLINK_CB(skb).portid;
88 ctx->report = nlmsg_report(nlh);
89 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 90}
91
8411b644
PNA		 92static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
93 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 94{
95 struct nft_trans *trans;
96
8411b644 97 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 98 if (trans == NULL)
99 return NULL;
100
b380e5c7 101 trans->msg_type = msg_type;
1081d11b
PNA		 102 trans->ctx = *ctx;
103
104 return trans;
105}
106
8411b644
PNA		 107static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
108 int msg_type, u32 size)
109{
110 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
111}
112
1081d11b
PNA		 113static void nft_trans_destroy(struct nft_trans *trans)
114{
115 list_del(&trans->list);
116 kfree(trans);
117}
118
c974a3a3
PNA		 119static int nf_tables_register_hook(struct net *net,
120 const struct nft_table *table,
121 struct nft_chain *chain)
d8ee8f7c 122{
4e25ceb8 123 const struct nft_base_chain *basechain;
a37061a6 124 const struct nf_hook_ops *ops;
ae6153b5 125
d8ee8f7c 126 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 127 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 128 return 0;
129
4e25ceb8
FW		 130 basechain = nft_base_chain(chain);
131 ops = &basechain->ops;
ae6153b5 132
4e25ceb8
FW		 133 if (basechain->type->ops_register)
134 return basechain->type->ops_register(net, ops);
135
a37061a6 136 return nf_register_net_hook(net, ops);
d8ee8f7c
PNA		 137}
138
c974a3a3
PNA		 139static void nf_tables_unregister_hook(struct net *net,
140 const struct nft_table *table,
141 struct nft_chain *chain)
c5598794 142{
4e25ceb8
FW		 143 const struct nft_base_chain *basechain;
144 const struct nf_hook_ops *ops;
145
d8ee8f7c 146 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 147 !nft_is_base_chain(chain))
d8ee8f7c 148 return;
4e25ceb8
FW		 149 basechain = nft_base_chain(chain);
150 ops = &basechain->ops;
d8ee8f7c 151
4e25ceb8
FW		 152 if (basechain->type->ops_unregister)
153 return basechain->type->ops_unregister(net, ops);
154
155 nf_unregister_net_hook(net, ops);
c5598794
AB		 156}
157
ee01d542
AB		 158static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
159{
160 struct nft_trans *trans;
161
162 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
163 if (trans == NULL)
164 return -ENOMEM;
165
166 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 167 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 168
169 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
170 return 0;
171}
172
173static int nft_deltable(struct nft_ctx *ctx)
174{
175 int err;
176
177 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
178 if (err < 0)
179 return err;
180
f2a6d766 181 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 182 return err;
183}
184
185static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
186{
187 struct nft_trans *trans;
188
189 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
190 if (trans == NULL)
191 return -ENOMEM;
192
193 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 194 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 195
196 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
197 return 0;
198}
199
200static int nft_delchain(struct nft_ctx *ctx)
201{
202 int err;
203
204 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
205 if (err < 0)
206 return err;
207
208 ctx->table->use--;
664b0f8c 209 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542
AB		 210
211 return err;
212}
213
0ef235c7
FW		 214/* either expr ops provide both activate/deactivate, or neither */
215static bool nft_expr_check_ops(const struct nft_expr_ops *ops)
216{
217 if (!ops)
218 return true;
219
220 if (WARN_ON_ONCE((!ops->activate ^ !ops->deactivate)))
221 return false;
222
223 return true;
224}
225
bb7b40ae
PNA		 226static void nft_rule_expr_activate(const struct nft_ctx *ctx,
227 struct nft_rule *rule)
228{
229 struct nft_expr *expr;
230
231 expr = nft_expr_first(rule);
232 while (expr != nft_expr_last(rule) && expr->ops) {
233 if (expr->ops->activate)
234 expr->ops->activate(ctx, expr);
235
236 expr = nft_expr_next(expr);
237 }
238}
239
240static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
241 struct nft_rule *rule)
242{
243 struct nft_expr *expr;
244
245 expr = nft_expr_first(rule);
246 while (expr != nft_expr_last(rule) && expr->ops) {
247 if (expr->ops->deactivate)
248 expr->ops->deactivate(ctx, expr);
249
250 expr = nft_expr_next(expr);
251 }
252}
253
ee01d542
AB		 254static int
255nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
256{
257 /* You cannot delete the same rule twice */
889f7ee7
PNA		 258 if (nft_is_active_next(ctx->net, rule)) {
259 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 260 ctx->chain->use--;
261 return 0;
262 }
263 return -ENOENT;
264}
265
266static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
267 struct nft_rule *rule)
268{
269 struct nft_trans *trans;
270
271 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
272 if (trans == NULL)
273 return NULL;
274
1a94e38d
PNA		 275 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
276 nft_trans_rule_id(trans) =
277 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
278 }
ee01d542
AB		 279 nft_trans_rule(trans) = rule;
280 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
281
282 return trans;
283}
284
285static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
286{
287 struct nft_trans *trans;
288 int err;
289
290 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
291 if (trans == NULL)
292 return -ENOMEM;
293
294 err = nf_tables_delrule_deactivate(ctx, rule);
295 if (err < 0) {
296 nft_trans_destroy(trans);
297 return err;
298 }
bb7b40ae 299 nft_rule_expr_deactivate(ctx, rule);
ee01d542
AB		 300
301 return 0;
302}
303
304static int nft_delrule_by_chain(struct nft_ctx *ctx)
305{
306 struct nft_rule *rule;
307 int err;
308
309 list_for_each_entry(rule, &ctx->chain->rules, list) {
310 err = nft_delrule(ctx, rule);
311 if (err < 0)
312 return err;
313 }
314 return 0;
315}
316
cd5125d8 317static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
ee01d542
AB		 318 struct nft_set *set)
319{
320 struct nft_trans *trans;
321
322 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
323 if (trans == NULL)
324 return -ENOMEM;
325
326 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
327 nft_trans_set_id(trans) =
328 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 329 nft_activate_next(ctx->net, set);
ee01d542
AB		 330 }
331 nft_trans_set(trans) = set;
332 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
333
334 return 0;
335}
336
cd5125d8 337static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
ee01d542
AB		 338{
339 int err;
340
341 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
342 if (err < 0)
343 return err;
344
37a9cc52 345 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 346 ctx->table->use--;
347
348 return err;
349}
350
e5009240
PNA		 351static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
352 struct nft_object *obj)
353{
354 struct nft_trans *trans;
355
356 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
357 if (trans == NULL)
358 return -ENOMEM;
359
360 if (msg_type == NFT_MSG_NEWOBJ)
361 nft_activate_next(ctx->net, obj);
362
363 nft_trans_obj(trans) = obj;
364 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
365
366 return 0;
367}
368
369static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
370{
371 int err;
372
373 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
374 if (err < 0)
375 return err;
376
377 nft_deactivate_next(ctx->net, obj);
378 ctx->table->use--;
379
380 return err;
381}
382
3b49e2e9
PNA		 383static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
384 struct nft_flowtable *flowtable)
385{
386 struct nft_trans *trans;
387
388 trans = nft_trans_alloc(ctx, msg_type,
389 sizeof(struct nft_trans_flowtable));
390 if (trans == NULL)
391 return -ENOMEM;
392
393 if (msg_type == NFT_MSG_NEWFLOWTABLE)
394 nft_activate_next(ctx->net, flowtable);
395
396 nft_trans_flowtable(trans) = flowtable;
397 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
398
399 return 0;
400}
401
402static int nft_delflowtable(struct nft_ctx *ctx,
403 struct nft_flowtable *flowtable)
404{
405 int err;
406
407 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
408 if (err < 0)
409 return err;
410
411 nft_deactivate_next(ctx->net, flowtable);
412 ctx->table->use--;
413
414 return err;
415}
416
96518518
PM		 417/*
418 * Tables
419 */
420
36596dad 421static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 422 const struct nlattr *nla,
36596dad 423 u8 family, u8 genmask)
96518518
PM		 424{
425 struct nft_table *table;
426
cac20fcd
PNA		 427 if (nla == NULL)
428 return ERR_PTR(-EINVAL);
429
d9adf22a 430 list_for_each_entry_rcu(table, &net->nft.tables, list) {
f2a6d766 431 if (!nla_strcmp(nla, table->name) &&
98319cb9 432 table->family == family &&
f2a6d766 433 nft_active_genmask(table, genmask))
96518518
PM		 434 return table;
435 }
cac20fcd
PNA		 436
437 return ERR_PTR(-ENOENT);
96518518
PM		 438}
439
3ecbfd65
HS		 440static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
441 const struct nlattr *nla,
442 u8 genmask)
443{
444 struct nft_table *table;
445
446 list_for_each_entry(table, &net->nft.tables, list) {
447 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
448 nft_active_genmask(table, genmask))
449 return table;
450 }
3ecbfd65
HS		 451
452 return ERR_PTR(-ENOENT);
453}
454
96518518
PM		 455static inline u64 nf_tables_alloc_handle(struct nft_table *table)
456{
457 return ++table->hgenerator;
458}
459
32537e91 460static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 461
32537e91 462static const struct nft_chain_type *
1ea26cca 463__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c
PNA		 464{
465 int i;
466
baae3e62 467 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
9370761c
PNA		 468 if (chain_type[family][i] != NULL &&
469 !nla_strcmp(nla, chain_type[family][i]->name))
baae3e62 470 return chain_type[family][i];
9370761c 471 }
baae3e62 472 return NULL;
9370761c
PNA		 473}
474
452238e8
FW		 475/*
476 * Loading a module requires dropping mutex that guards the
477 * transaction.
478 * We first need to abort any pending transactions as once
479 * mutex is unlocked a different client could start a new
480 * transaction. It must not see any 'future generation'
481 * changes * as these changes will never happen.
482 */
483#ifdef CONFIG_MODULES
484static int __nf_tables_abort(struct net *net);
485
486static void nft_request_module(struct net *net, const char *fmt, ...)
487{
488 char module_name[MODULE_NAME_LEN];
489 va_list args;
490 int ret;
491
492 __nf_tables_abort(net);
493
494 va_start(args, fmt);
495 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
496 va_end(args);
497 if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
498 return;
499
f102d66b 500 mutex_unlock(&net->nft.commit_mutex);
452238e8 501 request_module("%s", module_name);
f102d66b 502 mutex_lock(&net->nft.commit_mutex);
452238e8
FW		 503}
504#endif
505
f102d66b
FW		 506static void lockdep_nfnl_nft_mutex_not_held(void)
507{
508#ifdef CONFIG_PROVE_LOCKING
509 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
510#endif
511}
512
32537e91 513static const struct nft_chain_type *
452238e8
FW		 514nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
515 u8 family, bool autoload)
9370761c 516{
32537e91 517 const struct nft_chain_type *type;
9370761c 518
1ea26cca 519 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 520 if (type != NULL)
521 return type;
f102d66b
FW		 522
523 lockdep_nfnl_nft_mutex_not_held();
9370761c 524#ifdef CONFIG_MODULES
93b0806f 525 if (autoload) {
452238e8
FW		 526 nft_request_module(net, "nft-chain-%u-%.*s", family,
527 nla_len(nla), (const char *)nla_data(nla));
1ea26cca 528 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 529 if (type != NULL)
530 return ERR_PTR(-EAGAIN);
9370761c
PNA		 531 }
532#endif
93b0806f 533 return ERR_PTR(-ENOENT);
9370761c
PNA		 534}
535
96518518 536static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 537 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
538 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 539 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 540 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
96518518
PM		 541};
542
84d7fce6
PNA		 543static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
544 u32 portid, u32 seq, int event, u32 flags,
545 int family, const struct nft_table *table)
96518518
PM		 546{
547 struct nlmsghdr *nlh;
548 struct nfgenmsg *nfmsg;
549
dedb67c4 550 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
552 if (nlh == NULL)
553 goto nla_put_failure;
554
555 nfmsg = nlmsg_data(nlh);
556 nfmsg->nfgen_family = family;
557 nfmsg->version = NFNETLINK_V0;
84d7fce6 558 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 559
9ddf6323 560 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768 561 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
3ecbfd65
HS		 562 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
563 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
564 NFTA_TABLE_PAD))
96518518
PM		 565 goto nla_put_failure;
566
053c095a
JB		 567 nlmsg_end(skb, nlh);
568 return 0;
96518518
PM		 569
570nla_put_failure:
571 nlmsg_trim(skb, nlh);
572 return -1;
573}
574
25e94a99 575static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 576{
577 struct sk_buff *skb;
96518518
PM		 578 int err;
579
128ad332
PNA		 580 if (!ctx->report &&
581 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 582 return;
96518518 583
96518518
PM		 584 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
585 if (skb == NULL)
586 goto err;
587
84d7fce6 588 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 589 event, 0, ctx->family, ctx->table);
96518518
PM		 590 if (err < 0) {
591 kfree_skb(skb);
592 goto err;
593 }
594
25e94a99
PNA		 595 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
596 ctx->report, GFP_KERNEL);
597 return;
96518518 598err:
25e94a99 599 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 600}
601
602static int nf_tables_dump_tables(struct sk_buff *skb,
603 struct netlink_callback *cb)
604{
605 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 606 const struct nft_table *table;
607 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 608 struct net *net = sock_net(skb->sk);
96518518
PM		 609 int family = nfmsg->nfgen_family;
610
e688a7f8 611 rcu_read_lock();
38e029f1
PNA		 612 cb->seq = net->nft.base_seq;
613
36596dad 614 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 615 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 616 continue;
617
36596dad
PNA		 618 if (idx < s_idx)
619 goto cont;
620 if (idx > s_idx)
621 memset(&cb->args[1], 0,
622 sizeof(cb->args) - sizeof(cb->args[0]));
623 if (!nft_is_active(net, table))
624 continue;
625 if (nf_tables_fill_table_info(skb, net,
626 NETLINK_CB(cb->skb).portid,
627 cb->nlh->nlmsg_seq,
628 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 629 table->family, table) < 0)
36596dad
PNA		 630 goto done;
631
632 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 633cont:
36596dad 634 idx++;
96518518
PM		 635 }
636done:
e688a7f8 637 rcu_read_unlock();
96518518
PM		 638 cb->args[0] = idx;
639 return skb->len;
640}
641
d9adf22a
FW		 642static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
643 const struct nlmsghdr *nlh,
644 struct netlink_dump_control *c)
645{
646 int err;
647
648 if (!try_module_get(THIS_MODULE))
649 return -EINVAL;
650
651 rcu_read_unlock();
652 err = netlink_dump_start(nlsk, skb, nlh, c);
653 rcu_read_lock();
654 module_put(THIS_MODULE);
655
656 return err;
657}
658
659/* called with rcu_read_lock held */
7b8002a1
PNA		 660static int nf_tables_gettable(struct net *net, struct sock *nlsk,
661 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 662 const struct nlattr * const nla[],
663 struct netlink_ext_ack *extack)
96518518
PM		 664{
665 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 666 u8 genmask = nft_genmask_cur(net);
96518518
PM		 667 const struct nft_table *table;
668 struct sk_buff *skb2;
669 int family = nfmsg->nfgen_family;
670 int err;
671
672 if (nlh->nlmsg_flags & NLM_F_DUMP) {
673 struct netlink_dump_control c = {
674 .dump = nf_tables_dump_tables,
d9adf22a 675 .module = THIS_MODULE,
96518518 676 };
d9adf22a
FW		 677
678 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 679 }
680
cac20fcd 681 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
36dd1bcc
PNA		 682 if (IS_ERR(table)) {
683 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 684 return PTR_ERR(table);
36dd1bcc 685 }
96518518 686
d9adf22a 687 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 688 if (!skb2)
689 return -ENOMEM;
690
84d7fce6 691 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 692 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
693 family, table);
694 if (err < 0)
695 goto err;
696
697 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
698
699err:
700 kfree_skb(skb2);
701 return err;
702}
703
c9c17211 704static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 705{
706 struct nft_chain *chain;
707 u32 i = 0;
708
709 list_for_each_entry(chain, &table->chains, list) {
710 if (!nft_is_active_next(net, chain))
711 continue;
f323d954 712 if (!nft_is_base_chain(chain))
10435c11
F		 713 continue;
714
715 if (cnt && i++ == cnt)
716 break;
717
c974a3a3 718 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
10435c11
F		 719 }
720}
721
c9c17211 722static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 723{
724 struct nft_chain *chain;
725 int err, i = 0;
726
727 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 728 if (!nft_is_active_next(net, chain))
729 continue;
f323d954 730 if (!nft_is_base_chain(chain))
d2012975
PNA		 731 continue;
732
c974a3a3 733 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
9ddf6323
PNA		 734 if (err < 0)
735 goto err;
736
737 i++;
738 }
739 return 0;
740err:
10435c11 741 if (i)
c9c17211 742 nft_table_disable(net, table, i);
9ddf6323
PNA		 743 return err;
744}
745
c9c17211 746static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 747{
c9c17211 748 nft_table_disable(net, table, 0);
9ddf6323
PNA		 749}
750
e1aaca93 751static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 752{
55dd6f93 753 struct nft_trans *trans;
e1aaca93 754 u32 flags;
55dd6f93 755 int ret = 0;
9ddf6323 756
e1aaca93
PNA		 757 if (!ctx->nla[NFTA_TABLE_FLAGS])
758 return 0;
9ddf6323 759
e1aaca93
PNA		 760 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
761 if (flags & ~NFT_TABLE_F_DORMANT)
762 return -EINVAL;
763
63283dd2
PNA		 764 if (flags == ctx->table->flags)
765 return 0;
766
55dd6f93
PNA		 767 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
768 sizeof(struct nft_trans_table));
769 if (trans == NULL)
770 return -ENOMEM;
9ddf6323 771
e1aaca93
PNA		 772 if ((flags & NFT_TABLE_F_DORMANT) &&
773 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 774 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 775 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
776 ctx->table->flags & NFT_TABLE_F_DORMANT) {
c9c17211 777 ret = nf_tables_table_enable(ctx->net, ctx->table);
55dd6f93 778 if (ret >= 0) {
e1aaca93 779 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 780 nft_trans_table_enable(trans) = true;
9ddf6323 781 }
9ddf6323 782 }
e1aaca93
PNA		 783 if (ret < 0)
784 goto err;
9ddf6323 785
55dd6f93
PNA		 786 nft_trans_table_update(trans) = true;
787 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
788 return 0;
9ddf6323 789err:
55dd6f93 790 nft_trans_destroy(trans);
9ddf6323
PNA		 791 return ret;
792}
793
1b2470e5
FW		 794static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
795{
796 const char *name = data;
797
798 return jhash(name, strlen(name), seed);
799}
800
801static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
802{
803 const struct nft_chain *chain = data;
804
805 return nft_chain_hash(chain->name, 0, seed);
806}
807
808static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
809 const void *ptr)
810{
811 const struct nft_chain *chain = ptr;
812 const char *name = arg->key;
813
814 return strcmp(chain->name, name);
815}
816
633c9a84
PNA		 817static int nf_tables_newtable(struct net *net, struct sock *nlsk,
818 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 819 const struct nlattr * const nla[],
820 struct netlink_ext_ack *extack)
96518518
PM		 821{
822 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 823 u8 genmask = nft_genmask_next(net);
96518518 824 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 825 const struct nlattr *attr;
826 struct nft_table *table;
c5c1f975 827 u32 flags = 0;
e1aaca93 828 struct nft_ctx ctx;
55dd6f93 829 int err;
96518518 830
f102d66b 831 lockdep_assert_held(&net->nft.commit_mutex);
36dd1bcc
PNA		 832 attr = nla[NFTA_TABLE_NAME];
833 table = nft_table_lookup(net, attr, family, genmask);
96518518
PM		 834 if (IS_ERR(table)) {
835 if (PTR_ERR(table) != -ENOENT)
836 return PTR_ERR(table);
1a28ad74 837 } else {
36dd1bcc
PNA		 838 if (nlh->nlmsg_flags & NLM_F_EXCL) {
839 NL_SET_BAD_ATTR(extack, attr);
96518518 840 return -EEXIST;
36dd1bcc 841 }
96518518
PM		 842 if (nlh->nlmsg_flags & NLM_F_REPLACE)
843 return -EOPNOTSUPP;
e1aaca93 844
98319cb9 845 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e1aaca93 846 return nf_tables_updtable(&ctx);
96518518
PM		 847 }
848
c5c1f975
PM		 849 if (nla[NFTA_TABLE_FLAGS]) {
850 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
851 if (flags & ~NFT_TABLE_F_DORMANT)
852 return -EINVAL;
853 }
854
ffdb210e 855 err = -ENOMEM;
1cae565e 856 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 857 if (table == NULL)
98319cb9 858 goto err_kzalloc;
96518518 859
36dd1bcc 860 table->name = nla_strdup(attr, GFP_KERNEL);
e46abbcc 861 if (table->name == NULL)
98319cb9 862 goto err_strdup;
e46abbcc 863
1b2470e5
FW		 864 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
865 if (err)
866 goto err_chain_ht;
867
96518518 868 INIT_LIST_HEAD(&table->chains);
20a69341 869 INIT_LIST_HEAD(&table->sets);
e5009240 870 INIT_LIST_HEAD(&table->objects);
3b49e2e9 871 INIT_LIST_HEAD(&table->flowtables);
98319cb9 872 table->family = family;
c5c1f975 873 table->flags = flags;
3ecbfd65 874 table->handle = ++table_handle;
9ddf6323 875
98319cb9 876 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
55dd6f93 877 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 878 if (err < 0)
98319cb9 879 goto err_trans;
ffdb210e 880
36596dad 881 list_add_tail_rcu(&table->list, &net->nft.tables);
96518518 882 return 0;
98319cb9 883err_trans:
1b2470e5
FW		 884 rhltable_destroy(&table->chains_ht);
885err_chain_ht:
e46abbcc 886 kfree(table->name);
98319cb9 887err_strdup:
ffdb210e 888 kfree(table);
98319cb9 889err_kzalloc:
ffdb210e 890 return err;
96518518
PM		 891}
892
b9ac12ef
AB		 893static int nft_flush_table(struct nft_ctx *ctx)
894{
3b49e2e9 895 struct nft_flowtable *flowtable, *nft;
b9ac12ef 896 struct nft_chain *chain, *nc;
e5009240 897 struct nft_object *obj, *ne;
b9ac12ef 898 struct nft_set *set, *ns;
3b49e2e9 899 int err;
b9ac12ef 900
a2f18db0 901 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 902 if (!nft_is_active_next(ctx->net, chain))
903 continue;
904
b9ac12ef
AB		 905 ctx->chain = chain;
906
907 err = nft_delrule_by_chain(ctx);
908 if (err < 0)
909 goto out;
b9ac12ef
AB		 910 }
911
912 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 913 if (!nft_is_active_next(ctx->net, set))
914 continue;
915
408070d6 916 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 917 !list_empty(&set->bindings))
918 continue;
919
920 err = nft_delset(ctx, set);
921 if (err < 0)
922 goto out;
923 }
924
3b49e2e9
PNA		 925 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
926 err = nft_delflowtable(ctx, flowtable);
927 if (err < 0)
928 goto out;
929 }
930
e5009240
PNA		 931 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
932 err = nft_delobj(ctx, obj);
933 if (err < 0)
934 goto out;
935 }
936
a2f18db0 937 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 938 if (!nft_is_active_next(ctx->net, chain))
939 continue;
940
a2f18db0
PNA		 941 ctx->chain = chain;
942
943 err = nft_delchain(ctx);
944 if (err < 0)
945 goto out;
946 }
947
b9ac12ef
AB		 948 err = nft_deltable(ctx);
949out:
950 return err;
951}
952
953static int nft_flush(struct nft_ctx *ctx, int family)
954{
b9ac12ef
AB		 955 struct nft_table *table, *nt;
956 const struct nlattr * const *nla = ctx->nla;
957 int err = 0;
958
36596dad 959 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
98319cb9 960 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 961 continue;
962
98319cb9 963 ctx->family = table->family;
f2a6d766 964
36596dad
PNA		 965 if (!nft_is_active_next(ctx->net, table))
966 continue;
b9ac12ef 967
36596dad
PNA		 968 if (nla[NFTA_TABLE_NAME] &&
969 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
970 continue;
b9ac12ef 971
36596dad
PNA		 972 ctx->table = table;
973
974 err = nft_flush_table(ctx);
975 if (err < 0)
976 goto out;
b9ac12ef
AB		 977 }
978out:
979 return err;
980}
981
633c9a84
PNA		 982static int nf_tables_deltable(struct net *net, struct sock *nlsk,
983 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 984 const struct nlattr * const nla[],
985 struct netlink_ext_ack *extack)
96518518
PM		 986{
987 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 988 u8 genmask = nft_genmask_next(net);
ee01d542 989 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 990 const struct nlattr *attr;
991 struct nft_table *table;
55dd6f93 992 struct nft_ctx ctx;
96518518 993
36596dad 994 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 995 if (family == AF_UNSPEC ||
996 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 997 return nft_flush(&ctx, family);
998
36dd1bcc
PNA		 999 if (nla[NFTA_TABLE_HANDLE]) {
1000 attr = nla[NFTA_TABLE_HANDLE];
1001 table = nft_table_lookup_byhandle(net, attr, genmask);
1002 } else {
1003 attr = nla[NFTA_TABLE_NAME];
1004 table = nft_table_lookup(net, attr, family, genmask);
1005 }
3ecbfd65 1006
36dd1bcc
PNA		 1007 if (IS_ERR(table)) {
1008 NL_SET_BAD_ATTR(extack, attr);
96518518 1009 return PTR_ERR(table);
36dd1bcc 1010 }
96518518 1011
a8278400
PNA		 1012 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1013 table->use > 0)
1014 return -EBUSY;
1015
98319cb9 1016 ctx.family = family;
b9ac12ef 1017 ctx.table = table;
55dd6f93 1018
b9ac12ef 1019 return nft_flush_table(&ctx);
96518518
PM		 1020}
1021
55dd6f93
PNA		 1022static void nf_tables_table_destroy(struct nft_ctx *ctx)
1023{
fa5950e4
FW		 1024 if (WARN_ON(ctx->table->use > 0))
1025 return;
4fefee57 1026
1b2470e5 1027 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1028 kfree(ctx->table->name);
55dd6f93 1029 kfree(ctx->table);
55dd6f93
PNA		 1030}
1031
cc07eeb0 1032void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1033{
d8297d4f 1034 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
cc07eeb0 1035 return;
d8297d4f 1036
96518518 1037 nfnl_lock(NFNL_SUBSYS_NFTABLES);
cc07eeb0
PNA		 1038 if (WARN_ON(chain_type[ctype->family][ctype->type] != NULL)) {
1039 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1040 return;
96518518 1041 }
9370761c 1042 chain_type[ctype->family][ctype->type] = ctype;
96518518 1043 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1044}
9370761c 1045EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1046
32537e91 1047void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1048{
96518518 1049 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1050 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1051 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1052}
9370761c 1053EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1054
1055/*
1056 * Chains
1057 */
1058
1059static struct nft_chain *
cac20fcd 1060nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1061{
1062 struct nft_chain *chain;
1063
1064 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1065 if (chain->handle == handle &&
1066 nft_active_genmask(chain, genmask))
96518518
PM		 1067 return chain;
1068 }
1069
1070 return ERR_PTR(-ENOENT);
1071}
1072
f102d66b
FW		 1073static bool lockdep_commit_lock_is_held(struct net *net)
1074{
1075#ifdef CONFIG_PROVE_LOCKING
1076 return lockdep_is_held(&net->nft.commit_mutex);
1077#else
1078 return true;
1079#endif
1080}
1081
1082static struct nft_chain *nft_chain_lookup(struct net *net,
1083 struct nft_table *table,
cac20fcd 1084 const struct nlattr *nla, u8 genmask)
96518518 1085{
1b2470e5
FW		 1086 char search[NFT_CHAIN_MAXNAMELEN + 1];
1087 struct rhlist_head *tmp, *list;
96518518
PM		 1088 struct nft_chain *chain;
1089
1090 if (nla == NULL)
1091 return ERR_PTR(-EINVAL);
1092
1b2470e5 1093 nla_strlcpy(search, nla, sizeof(search));
96518518 1094
1b2470e5 1095 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1096 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1097
1098 chain = ERR_PTR(-ENOENT);
1099 rcu_read_lock();
1100 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1101 if (!list)
1102 goto out_unlock;
1103
1104 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1105 if (nft_active_genmask(chain, genmask))
1106 goto out_unlock;
1107 }
1108 chain = ERR_PTR(-ENOENT);
1109out_unlock:
1110 rcu_read_unlock();
1111 return chain;
96518518
PM		 1112}
1113
1114static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1115 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1116 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1117 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1118 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1119 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1120 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1121 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
4c1f7818 1122 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
0ca743a5 1123 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
96518518
PM		 1124};
1125
1126static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1127 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1128 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1129 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1130 .len = IFNAMSIZ - 1 },
96518518
PM		 1131};
1132
0ca743a5
PNA		 1133static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1134{
1135 struct nft_stats *cpu_stats, total;
1136 struct nlattr *nest;
ce355e20
ED		 1137 unsigned int seq;
1138 u64 pkts, bytes;
0ca743a5
PNA		 1139 int cpu;
1140
1141 memset(&total, 0, sizeof(total));
1142 for_each_possible_cpu(cpu) {
1143 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 1144 do {
1145 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1146 pkts = cpu_stats->pkts;
1147 bytes = cpu_stats->bytes;
1148 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1149 total.pkts += pkts;
1150 total.bytes += bytes;
0ca743a5
PNA		 1151 }
1152 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1153 if (nest == NULL)
1154 goto nla_put_failure;
1155
b46f6ded
ND		 1156 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1157 NFTA_COUNTER_PAD) ||
1158 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1159 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1160 goto nla_put_failure;
1161
1162 nla_nest_end(skb, nest);
1163 return 0;
1164
1165nla_put_failure:
1166 return -ENOSPC;
1167}
1168
84d7fce6
PNA		 1169static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1170 u32 portid, u32 seq, int event, u32 flags,
1171 int family, const struct nft_table *table,
96518518
PM		 1172 const struct nft_chain *chain)
1173{
1174 struct nlmsghdr *nlh;
1175 struct nfgenmsg *nfmsg;
1176
dedb67c4 1177 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1178 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1179 if (nlh == NULL)
1180 goto nla_put_failure;
1181
1182 nfmsg = nlmsg_data(nlh);
1183 nfmsg->nfgen_family = family;
1184 nfmsg->version = NFNETLINK_V0;
84d7fce6 1185 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1186
1187 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1188 goto nla_put_failure;
b46f6ded
ND		 1189 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1190 NFTA_CHAIN_PAD))
96518518
PM		 1191 goto nla_put_failure;
1192 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1193 goto nla_put_failure;
1194
f323d954 1195 if (nft_is_base_chain(chain)) {
0ca743a5 1196 const struct nft_base_chain *basechain = nft_base_chain(chain);
c974a3a3 1197 const struct nf_hook_ops *ops = &basechain->ops;
0ca743a5
PNA		 1198 struct nlattr *nest;
1199
1200 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
96518518
PM		 1201 if (nest == NULL)
1202 goto nla_put_failure;
1203 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1204 goto nla_put_failure;
1205 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1206 goto nla_put_failure;
2cbce139
PNA		 1207 if (basechain->dev_name[0] &&
1208 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1209 goto nla_put_failure;
96518518 1210 nla_nest_end(skb, nest);
9370761c 1211
0ca743a5
PNA		 1212 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1213 htonl(basechain->policy)))
1214 goto nla_put_failure;
1215
baae3e62
PM		 1216 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1217 goto nla_put_failure;
0ca743a5 1218
5f9bfe0e 1219 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
0ca743a5 1220 goto nla_put_failure;
96518518
PM		 1221 }
1222
0ca743a5
PNA		 1223 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1224 goto nla_put_failure;
1225
053c095a
JB		 1226 nlmsg_end(skb, nlh);
1227 return 0;
96518518
PM		 1228
1229nla_put_failure:
1230 nlmsg_trim(skb, nlh);
1231 return -1;
1232}
1233
25e94a99 1234static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1235{
1236 struct sk_buff *skb;
96518518
PM		 1237 int err;
1238
128ad332
PNA		 1239 if (!ctx->report &&
1240 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1241 return;
96518518 1242
96518518
PM		 1243 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1244 if (skb == NULL)
1245 goto err;
1246
84d7fce6 1247 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 1248 event, 0, ctx->family, ctx->table,
35151d84 1249 ctx->chain);
96518518
PM		 1250 if (err < 0) {
1251 kfree_skb(skb);
1252 goto err;
1253 }
1254
25e94a99
PNA		 1255 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1256 ctx->report, GFP_KERNEL);
1257 return;
96518518 1258err:
25e94a99 1259 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1260}
1261
1262static int nf_tables_dump_chains(struct sk_buff *skb,
1263 struct netlink_callback *cb)
1264{
1265 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 1266 const struct nft_table *table;
1267 const struct nft_chain *chain;
1268 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1269 struct net *net = sock_net(skb->sk);
96518518
PM		 1270 int family = nfmsg->nfgen_family;
1271
e688a7f8 1272 rcu_read_lock();
38e029f1
PNA		 1273 cb->seq = net->nft.base_seq;
1274
36596dad 1275 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 1276 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1277 continue;
1278
36596dad
PNA		 1279 list_for_each_entry_rcu(chain, &table->chains, list) {
1280 if (idx < s_idx)
1281 goto cont;
1282 if (idx > s_idx)
1283 memset(&cb->args[1], 0,
1284 sizeof(cb->args) - sizeof(cb->args[0]));
1285 if (!nft_is_active(net, chain))
1286 continue;
1287 if (nf_tables_fill_chain_info(skb, net,
1288 NETLINK_CB(cb->skb).portid,
1289 cb->nlh->nlmsg_seq,
1290 NFT_MSG_NEWCHAIN,
1291 NLM_F_MULTI,
98319cb9 1292 table->family, table,
36596dad
PNA		 1293 chain) < 0)
1294 goto done;
38e029f1 1295
36596dad 1296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1297cont:
36596dad 1298 idx++;
96518518
PM		 1299 }
1300 }
1301done:
e688a7f8 1302 rcu_read_unlock();
96518518
PM		 1303 cb->args[0] = idx;
1304 return skb->len;
1305}
1306
d9adf22a 1307/* called with rcu_read_lock held */
7b8002a1
PNA		 1308static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1309 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1310 const struct nlattr * const nla[],
1311 struct netlink_ext_ack *extack)
96518518
PM		 1312{
1313 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1314 u8 genmask = nft_genmask_cur(net);
96518518 1315 const struct nft_chain *chain;
1b2470e5 1316 struct nft_table *table;
96518518
PM		 1317 struct sk_buff *skb2;
1318 int family = nfmsg->nfgen_family;
1319 int err;
1320
1321 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1322 struct netlink_dump_control c = {
1323 .dump = nf_tables_dump_chains,
d9adf22a 1324 .module = THIS_MODULE,
96518518 1325 };
d9adf22a
FW		 1326
1327 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 1328 }
1329
cac20fcd 1330 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1331 if (IS_ERR(table)) {
1332 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1333 return PTR_ERR(table);
36dd1bcc 1334 }
96518518 1335
f102d66b 1336 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1337 if (IS_ERR(chain)) {
1338 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1339 return PTR_ERR(chain);
36dd1bcc 1340 }
96518518 1341
d9adf22a 1342 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1343 if (!skb2)
1344 return -ENOMEM;
1345
84d7fce6 1346 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1347 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1348 family, table, chain);
1349 if (err < 0)
1350 goto err;
1351
1352 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1353
1354err:
1355 kfree_skb(skb2);
1356 return err;
1357}
1358
0ca743a5
PNA		 1359static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1360 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1361 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1362};
1363
ff3cd7b3 1364static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1365{
1366 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1367 struct nft_stats __percpu *newstats;
1368 struct nft_stats *stats;
1369 int err;
1370
fceb6435
JB		 1371 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1372 NULL);
0ca743a5 1373 if (err < 0)
ff3cd7b3 1374 return ERR_PTR(err);
0ca743a5
PNA		 1375
1376 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1377 return ERR_PTR(-EINVAL);
0ca743a5 1378
ce355e20 1379 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1380 if (newstats == NULL)
ff3cd7b3 1381 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1382
1383 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1384 * are not exposed to userspace.
1385 */
e8781f70 1386 preempt_disable();
0ca743a5
PNA		 1387 stats = this_cpu_ptr(newstats);
1388 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1389 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1390 preempt_enable();
0ca743a5 1391
ff3cd7b3
PNA		 1392 return newstats;
1393}
1394
1395static void nft_chain_stats_replace(struct nft_base_chain *chain,
1396 struct nft_stats __percpu *newstats)
1397{
0befd061
PNA		 1398 struct nft_stats __percpu *oldstats;
1399
b88825de
PNA		 1400 if (newstats == NULL)
1401 return;
1402
0ca743a5 1403 if (chain->stats) {
0befd061 1404 oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
0ca743a5
PNA		 1405 rcu_assign_pointer(chain->stats, newstats);
1406 synchronize_rcu();
1407 free_percpu(oldstats);
bbb8c61f 1408 } else {
0ca743a5 1409 rcu_assign_pointer(chain->stats, newstats);
bbb8c61f
TY		 1410 static_branch_inc(&nft_counters_enabled);
1411 }
0ca743a5
PNA		 1412}
1413
0cbc06b3
FW		 1414static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1415{
1416 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1417 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1418
1419 if (g0 != g1)
1420 kvfree(g1);
1421 kvfree(g0);
1422
1423 /* should be NULL either via abort or via successful commit */
1424 WARN_ON_ONCE(chain->rules_next);
1425 kvfree(chain->rules_next);
1426}
1427
43a605f2 1428static void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1429{
43a605f2
PNA		 1430 struct nft_chain *chain = ctx->chain;
1431
fa5950e4
FW		 1432 if (WARN_ON(chain->use > 0))
1433 return;
91c7b38d 1434
0cbc06b3
FW		 1435 /* no concurrent access possible anymore */
1436 nf_tables_chain_free_chain_rules(chain);
1437
f323d954 1438 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1439 struct nft_base_chain *basechain = nft_base_chain(chain);
1440
1441 module_put(basechain->type->owner);
1442 free_percpu(basechain->stats);
9f08ea84
PNA		 1443 if (basechain->stats)
1444 static_branch_dec(&nft_counters_enabled);
b7263e07 1445 kfree(chain->name);
2cbce139 1446 kfree(basechain);
91c7b38d 1447 } else {
b7263e07 1448 kfree(chain->name);
91c7b38d
PNA		 1449 kfree(chain);
1450 }
1451}
1452
508f8ccd
PNA		 1453struct nft_chain_hook {
1454 u32 num;
84ba7dd7 1455 s32 priority;
32537e91 1456 const struct nft_chain_type *type;
508f8ccd
PNA		 1457 struct net_device *dev;
1458};
1459
1460static int nft_chain_parse_hook(struct net *net,
1461 const struct nlattr * const nla[],
36596dad 1462 struct nft_chain_hook *hook, u8 family,
445509eb 1463 bool autoload)
508f8ccd
PNA		 1464{
1465 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 1466 const struct nft_chain_type *type;
508f8ccd
PNA		 1467 struct net_device *dev;
1468 int err;
1469
f102d66b
FW		 1470 lockdep_assert_held(&net->nft.commit_mutex);
1471 lockdep_nfnl_nft_mutex_not_held();
1472
508f8ccd 1473 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
fceb6435 1474 nft_hook_policy, NULL);
508f8ccd
PNA		 1475 if (err < 0)
1476 return err;
1477
1478 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1479 ha[NFTA_HOOK_PRIORITY] == NULL)
1480 return -EINVAL;
1481
1482 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 1483 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1484
36596dad 1485 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
508f8ccd 1486 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 1487 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 1488 family, autoload);
508f8ccd
PNA		 1489 if (IS_ERR(type))
1490 return PTR_ERR(type);
1491 }
1492 if (!(type->hook_mask & (1 << hook->num)))
1493 return -EOPNOTSUPP;
84ba7dd7
FW		 1494
1495 if (type->type == NFT_CHAIN_T_NAT &&
1496 hook->priority <= NF_IP_PRI_CONNTRACK)
1497 return -EOPNOTSUPP;
1498
508f8ccd
PNA		 1499 if (!try_module_get(type->owner))
1500 return -ENOENT;
1501
1502 hook->type = type;
1503
1504 hook->dev = NULL;
36596dad 1505 if (family == NFPROTO_NETDEV) {
508f8ccd
PNA		 1506 char ifname[IFNAMSIZ];
1507
1508 if (!ha[NFTA_HOOK_DEV]) {
1509 module_put(type->owner);
1510 return -EOPNOTSUPP;
1511 }
1512
1513 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
90d2723c 1514 dev = __dev_get_by_name(net, ifname);
508f8ccd
PNA		 1515 if (!dev) {
1516 module_put(type->owner);
1517 return -ENOENT;
1518 }
1519 hook->dev = dev;
1520 } else if (ha[NFTA_HOOK_DEV]) {
1521 module_put(type->owner);
1522 return -EOPNOTSUPP;
1523 }
1524
1525 return 0;
1526}
1527
1528static void nft_chain_release_hook(struct nft_chain_hook *hook)
1529{
1530 module_put(hook->type->owner);
508f8ccd
PNA		 1531}
1532
0cbc06b3
FW		 1533struct nft_rules_old {
1534 struct rcu_head h;
1535 struct nft_rule **start;
1536};
1537
1538static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1539 unsigned int alloc)
1540{
1541 if (alloc > INT_MAX)
1542 return NULL;
1543
1544 alloc += 1; /* NULL, ends rules */
1545 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1546 return NULL;
1547
1548 alloc *= sizeof(struct nft_rule *);
1549 alloc += sizeof(struct nft_rules_old);
1550
1551 return kvmalloc(alloc, GFP_KERNEL);
1552}
1553
4035285f 1554static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
445509eb 1555 u8 policy)
4035285f
PNA		 1556{
1557 const struct nlattr * const *nla = ctx->nla;
1558 struct nft_table *table = ctx->table;
4035285f
PNA		 1559 struct nft_base_chain *basechain;
1560 struct nft_stats __percpu *stats;
1561 struct net *net = ctx->net;
1562 struct nft_chain *chain;
0cbc06b3 1563 struct nft_rule **rules;
4035285f
PNA		 1564 int err;
1565
1566 if (table->use == UINT_MAX)
1567 return -EOVERFLOW;
1568
1569 if (nla[NFTA_CHAIN_HOOK]) {
1570 struct nft_chain_hook hook;
1571 struct nf_hook_ops *ops;
4035285f 1572
445509eb 1573 err = nft_chain_parse_hook(net, nla, &hook, family, true);
4035285f
PNA		 1574 if (err < 0)
1575 return err;
1576
1577 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1578 if (basechain == NULL) {
1579 nft_chain_release_hook(&hook);
1580 return -ENOMEM;
1581 }
1582
1583 if (hook.dev != NULL)
1584 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1585
1586 if (nla[NFTA_CHAIN_COUNTERS]) {
1587 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1588 if (IS_ERR(stats)) {
1589 nft_chain_release_hook(&hook);
1590 kfree(basechain);
1591 return PTR_ERR(stats);
1592 }
1593 basechain->stats = stats;
1594 static_branch_inc(&nft_counters_enabled);
1595 }
1596
4035285f
PNA		 1597 basechain->type = hook.type;
1598 chain = &basechain->chain;
1599
c974a3a3
PNA		 1600 ops = &basechain->ops;
1601 ops->pf = family;
1602 ops->hooknum = hook.num;
1603 ops->priority = hook.priority;
1604 ops->priv = chain;
c2f9eafe 1605 ops->hook = hook.type->hooks[ops->hooknum];
c974a3a3 1606 ops->dev = hook.dev;
c974a3a3 1607
4035285f
PNA		 1608 chain->flags |= NFT_BASE_CHAIN;
1609 basechain->policy = policy;
1610 } else {
1611 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1612 if (chain == NULL)
1613 return -ENOMEM;
1614 }
43a605f2
PNA		 1615 ctx->chain = chain;
1616
4035285f
PNA		 1617 INIT_LIST_HEAD(&chain->rules);
1618 chain->handle = nf_tables_alloc_handle(table);
1619 chain->table = table;
1620 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1621 if (!chain->name) {
1622 err = -ENOMEM;
1623 goto err1;
1624 }
1625
0cbc06b3
FW		 1626 rules = nf_tables_chain_alloc_rules(chain, 0);
1627 if (!rules) {
1628 err = -ENOMEM;
1629 goto err1;
1630 }
1631
1632 *rules = NULL;
1633 rcu_assign_pointer(chain->rules_gen_0, rules);
1634 rcu_assign_pointer(chain->rules_gen_1, rules);
1635
c974a3a3 1636 err = nf_tables_register_hook(net, table, chain);
4035285f
PNA		 1637 if (err < 0)
1638 goto err1;
1639
1b2470e5
FW		 1640 err = rhltable_insert_key(&table->chains_ht, chain->name,
1641 &chain->rhlhead, nft_chain_ht_params);
1642 if (err)
1643 goto err2;
1644
4035285f 1645 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1b2470e5
FW		 1646 if (err < 0) {
1647 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1648 nft_chain_ht_params);
4035285f 1649 goto err2;
1b2470e5 1650 }
4035285f
PNA		 1651
1652 table->use++;
1653 list_add_tail_rcu(&chain->list, &table->chains);
1654
1655 return 0;
1656err2:
c974a3a3 1657 nf_tables_unregister_hook(net, table, chain);
4035285f 1658err1:
43a605f2 1659 nf_tables_chain_destroy(ctx);
4035285f
PNA		 1660
1661 return err;
1662}
1663
445509eb 1664static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy)
2c4a488a
PNA		 1665{
1666 const struct nlattr * const *nla = ctx->nla;
1667 struct nft_table *table = ctx->table;
1668 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 1669 struct nft_base_chain *basechain;
1670 struct nft_stats *stats = NULL;
1671 struct nft_chain_hook hook;
2c4a488a
PNA		 1672 struct nf_hook_ops *ops;
1673 struct nft_trans *trans;
c974a3a3 1674 int err;
2c4a488a
PNA		 1675
1676 if (nla[NFTA_CHAIN_HOOK]) {
1677 if (!nft_is_base_chain(chain))
1678 return -EBUSY;
1679
36596dad 1680 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
445509eb 1681 false);
2c4a488a
PNA		 1682 if (err < 0)
1683 return err;
1684
1685 basechain = nft_base_chain(chain);
1686 if (basechain->type != hook.type) {
1687 nft_chain_release_hook(&hook);
1688 return -EBUSY;
1689 }
1690
c974a3a3
PNA		 1691 ops = &basechain->ops;
1692 if (ops->hooknum != hook.num ||
1693 ops->priority != hook.priority ||
1694 ops->dev != hook.dev) {
1695 nft_chain_release_hook(&hook);
1696 return -EBUSY;
2c4a488a
PNA		 1697 }
1698 nft_chain_release_hook(&hook);
1699 }
1700
1701 if (nla[NFTA_CHAIN_HANDLE] &&
1702 nla[NFTA_CHAIN_NAME]) {
1703 struct nft_chain *chain2;
1704
f102d66b
FW		 1705 chain2 = nft_chain_lookup(ctx->net, table,
1706 nla[NFTA_CHAIN_NAME], genmask);
0d18779b
JC		 1707 if (!IS_ERR(chain2))
1708 return -EEXIST;
2c4a488a
PNA		 1709 }
1710
1711 if (nla[NFTA_CHAIN_COUNTERS]) {
1712 if (!nft_is_base_chain(chain))
1713 return -EOPNOTSUPP;
1714
1715 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1716 if (IS_ERR(stats))
1717 return PTR_ERR(stats);
1718 }
1719
c6cc94df 1720 err = -ENOMEM;
2c4a488a
PNA		 1721 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1722 sizeof(struct nft_trans_chain));
c6cc94df
FW		 1723 if (trans == NULL)
1724 goto err;
2c4a488a
PNA		 1725
1726 nft_trans_chain_stats(trans) = stats;
1727 nft_trans_chain_update(trans) = true;
1728
1729 if (nla[NFTA_CHAIN_POLICY])
1730 nft_trans_chain_policy(trans) = policy;
1731 else
1732 nft_trans_chain_policy(trans) = -1;
1733
c6cc94df
FW		 1734 if (nla[NFTA_CHAIN_HANDLE] &&
1735 nla[NFTA_CHAIN_NAME]) {
1736 struct nft_trans *tmp;
1737 char *name;
1738
1739 err = -ENOMEM;
1740 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1741 if (!name)
1742 goto err;
1743
1744 err = -EEXIST;
1745 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
1746 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
1747 tmp->ctx.table == table &&
1748 nft_trans_chain_update(tmp) &&
1749 nft_trans_chain_name(tmp) &&
1750 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
1751 kfree(name);
1752 goto err;
1753 }
2c4a488a 1754 }
c6cc94df
FW		 1755
1756 nft_trans_chain_name(trans) = name;
2c4a488a
PNA		 1757 }
1758 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1759
1760 return 0;
c6cc94df
FW		 1761err:
1762 free_percpu(stats);
1763 kfree(trans);
1764 return err;
2c4a488a
PNA		 1765}
1766
633c9a84
PNA		 1767static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1768 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1769 const struct nlattr * const nla[],
1770 struct netlink_ext_ack *extack)
96518518
PM		 1771{
1772 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4035285f
PNA		 1773 u8 genmask = nft_genmask_next(net);
1774 int family = nfmsg->nfgen_family;
36dd1bcc 1775 const struct nlattr *attr;
96518518
PM		 1776 struct nft_table *table;
1777 struct nft_chain *chain;
57de2a0c 1778 u8 policy = NF_ACCEPT;
4035285f 1779 struct nft_ctx ctx;
96518518 1780 u64 handle = 0;
96518518 1781
f102d66b
FW		 1782 lockdep_assert_held(&net->nft.commit_mutex);
1783
cac20fcd 1784 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1785 if (IS_ERR(table)) {
1786 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1787 return PTR_ERR(table);
36dd1bcc 1788 }
96518518 1789
96518518 1790 chain = NULL;
36dd1bcc 1791 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 1792
1793 if (nla[NFTA_CHAIN_HANDLE]) {
1794 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 1795 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 1796 if (IS_ERR(chain)) {
1797 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 1798 return PTR_ERR(chain);
36dd1bcc
PNA		 1799 }
1800 attr = nla[NFTA_CHAIN_HANDLE];
96518518 1801 } else {
f102d66b 1802 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 1803 if (IS_ERR(chain)) {
36dd1bcc
PNA		 1804 if (PTR_ERR(chain) != -ENOENT) {
1805 NL_SET_BAD_ATTR(extack, attr);
96518518 1806 return PTR_ERR(chain);
36dd1bcc 1807 }
96518518
PM		 1808 chain = NULL;
1809 }
1810 }
1811
57de2a0c 1812 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 1813 if (chain != NULL &&
36dd1bcc
PNA		 1814 !nft_is_base_chain(chain)) {
1815 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 1816 return -EOPNOTSUPP;
36dd1bcc 1817 }
d6b6cb1d
PNA		 1818
1819 if (chain == NULL &&
36dd1bcc
PNA		 1820 nla[NFTA_CHAIN_HOOK] == NULL) {
1821 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 1822 return -EOPNOTSUPP;
36dd1bcc 1823 }
57de2a0c 1824
8f46df18 1825 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 1826 switch (policy) {
1827 case NF_DROP:
1828 case NF_ACCEPT:
1829 break;
1830 default:
1831 return -EINVAL;
1832 }
1833 }
1834
98319cb9 1835 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
4035285f 1836
96518518 1837 if (chain != NULL) {
36dd1bcc
PNA		 1838 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1839 NL_SET_BAD_ATTR(extack, attr);
96518518 1840 return -EEXIST;
36dd1bcc 1841 }
96518518
PM		 1842 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1843 return -EOPNOTSUPP;
1844
445509eb 1845 return nf_tables_updchain(&ctx, genmask, policy);
96518518
PM		 1846 }
1847
445509eb 1848 return nf_tables_addchain(&ctx, family, genmask, policy);
96518518
PM		 1849}
1850
633c9a84
PNA		 1851static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1852 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1853 const struct nlattr * const nla[],
1854 struct netlink_ext_ack *extack)
96518518
PM		 1855{
1856 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1857 u8 genmask = nft_genmask_next(net);
36dd1bcc
PNA		 1858 int family = nfmsg->nfgen_family;
1859 const struct nlattr *attr;
96518518
PM		 1860 struct nft_table *table;
1861 struct nft_chain *chain;
9dee1474 1862 struct nft_rule *rule;
91c7b38d 1863 struct nft_ctx ctx;
3ecbfd65 1864 u64 handle;
9dee1474
PNA		 1865 u32 use;
1866 int err;
96518518 1867
cac20fcd 1868 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1869 if (IS_ERR(table)) {
1870 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1871 return PTR_ERR(table);
36dd1bcc 1872 }
96518518 1873
3ecbfd65 1874 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 1875 attr = nla[NFTA_CHAIN_HANDLE];
1876 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 1877 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 1878 } else {
36dd1bcc 1879 attr = nla[NFTA_CHAIN_NAME];
f102d66b 1880 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 1881 }
36dd1bcc
PNA		 1882 if (IS_ERR(chain)) {
1883 NL_SET_BAD_ATTR(extack, attr);
96518518 1884 return PTR_ERR(chain);
36dd1bcc 1885 }
9dee1474
PNA		 1886
1887 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1888 chain->use > 0)
96518518
PM		 1889 return -EBUSY;
1890
98319cb9 1891 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0165d932 1892
9dee1474
PNA		 1893 use = chain->use;
1894 list_for_each_entry(rule, &chain->rules, list) {
1895 if (!nft_is_active_next(net, rule))
1896 continue;
1897 use--;
1898
1899 err = nft_delrule(&ctx, rule);
1900 if (err < 0)
1901 return err;
1902 }
1903
1904 /* There are rules and elements that are still holding references to us,
1905 * we cannot do a recursive removal in this case.
1906 */
36dd1bcc
PNA		 1907 if (use > 0) {
1908 NL_SET_BAD_ATTR(extack, attr);
9dee1474 1909 return -EBUSY;
36dd1bcc 1910 }
9dee1474 1911
ee01d542 1912 return nft_delchain(&ctx);
96518518
PM		 1913}
1914
96518518
PM		 1915/*
1916 * Expressions
1917 */
1918
1919/**
ef1f7df9
PM		 1920 * nft_register_expr - register nf_tables expr type
1921 * @ops: expr type
96518518 1922 *
ef1f7df9 1923 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 1924 * success or a negative errno code otherwise.
1925 */
ef1f7df9 1926int nft_register_expr(struct nft_expr_type *type)
96518518 1927{
0ef235c7
FW		 1928 if (!nft_expr_check_ops(type->ops))
1929 return -EINVAL;
1930
96518518 1931 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 1932 if (type->family == NFPROTO_UNSPEC)
e688a7f8 1933 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 1934 else
e688a7f8 1935 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 1936 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1937 return 0;
1938}
1939EXPORT_SYMBOL_GPL(nft_register_expr);
1940
1941/**
ef1f7df9
PM		 1942 * nft_unregister_expr - unregister nf_tables expr type
1943 * @ops: expr type
96518518 1944 *
ef1f7df9 1945 * Unregisters the expr typefor use with nf_tables.
96518518 1946 */
ef1f7df9 1947void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 1948{
1949 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 1950 list_del_rcu(&type->list);
96518518
PM		 1951 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1952}
1953EXPORT_SYMBOL_GPL(nft_unregister_expr);
1954
64d46806
PM		 1955static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1956 struct nlattr *nla)
96518518 1957{
ef1f7df9 1958 const struct nft_expr_type *type;
96518518 1959
ef1f7df9 1960 list_for_each_entry(type, &nf_tables_expressions, list) {
64d46806
PM		 1961 if (!nla_strcmp(nla, type->name) &&
1962 (!type->family || type->family == family))
ef1f7df9 1963 return type;
96518518
PM		 1964 }
1965 return NULL;
1966}
1967
452238e8
FW		 1968static const struct nft_expr_type *nft_expr_type_get(struct net *net,
1969 u8 family,
64d46806 1970 struct nlattr *nla)
96518518 1971{
ef1f7df9 1972 const struct nft_expr_type *type;
96518518
PM		 1973
1974 if (nla == NULL)
1975 return ERR_PTR(-EINVAL);
1976
64d46806 1977 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 1978 if (type != NULL && try_module_get(type->owner))
1979 return type;
96518518 1980
f102d66b 1981 lockdep_nfnl_nft_mutex_not_held();
96518518 1982#ifdef CONFIG_MODULES
ef1f7df9 1983 if (type == NULL) {
452238e8
FW		 1984 nft_request_module(net, "nft-expr-%u-%.*s", family,
1985 nla_len(nla), (char *)nla_data(nla));
64d46806
PM		 1986 if (__nft_expr_type_get(family, nla))
1987 return ERR_PTR(-EAGAIN);
1988
452238e8
FW		 1989 nft_request_module(net, "nft-expr-%.*s",
1990 nla_len(nla), (char *)nla_data(nla));
64d46806 1991 if (__nft_expr_type_get(family, nla))
96518518
PM		 1992 return ERR_PTR(-EAGAIN);
1993 }
1994#endif
1995 return ERR_PTR(-ENOENT);
1996}
1997
1998static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1999 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
2000 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2001};
2002
2003static int nf_tables_fill_expr_info(struct sk_buff *skb,
2004 const struct nft_expr *expr)
2005{
ef1f7df9 2006 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 2007 goto nla_put_failure;
2008
2009 if (expr->ops->dump) {
2010 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
2011 if (data == NULL)
2012 goto nla_put_failure;
2013 if (expr->ops->dump(skb, expr) < 0)
2014 goto nla_put_failure;
2015 nla_nest_end(skb, data);
2016 }
2017
2018 return skb->len;
2019
2020nla_put_failure:
2021 return -1;
2022};
2023
0b2d8a7b
PM		 2024int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2025 const struct nft_expr *expr)
2026{
2027 struct nlattr *nest;
2028
2029 nest = nla_nest_start(skb, attr);
2030 if (!nest)
2031 goto nla_put_failure;
2032 if (nf_tables_fill_expr_info(skb, expr) < 0)
2033 goto nla_put_failure;
2034 nla_nest_end(skb, nest);
2035 return 0;
2036
2037nla_put_failure:
2038 return -1;
2039}
2040
96518518
PM		 2041struct nft_expr_info {
2042 const struct nft_expr_ops *ops;
ef1f7df9 2043 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2044};
2045
0ca743a5
PNA		 2046static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2047 const struct nlattr *nla,
96518518
PM		 2048 struct nft_expr_info *info)
2049{
ef1f7df9 2050 const struct nft_expr_type *type;
96518518 2051 const struct nft_expr_ops *ops;
ef1f7df9 2052 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2053 int err;
2054
fceb6435 2055 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
96518518
PM		 2056 if (err < 0)
2057 return err;
2058
452238e8 2059 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2060 if (IS_ERR(type))
2061 return PTR_ERR(type);
2062
2063 if (tb[NFTA_EXPR_DATA]) {
2064 err = nla_parse_nested(info->tb, type->maxattr,
fceb6435 2065 tb[NFTA_EXPR_DATA], type->policy, NULL);
ef1f7df9
PM		 2066 if (err < 0)
2067 goto err1;
2068 } else
2069 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2070
2071 if (type->select_ops != NULL) {
0ca743a5
PNA		 2072 ops = type->select_ops(ctx,
2073 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2074 if (IS_ERR(ops)) {
2075 err = PTR_ERR(ops);
2076 goto err1;
2077 }
0ef235c7
FW		 2078 if (!nft_expr_check_ops(ops)) {
2079 err = -EINVAL;
2080 goto err1;
2081 }
ef1f7df9
PM		 2082 } else
2083 ops = type->ops;
2084
96518518
PM		 2085 info->ops = ops;
2086 return 0;
ef1f7df9
PM		 2087
2088err1:
2089 module_put(type->owner);
2090 return err;
96518518
PM		 2091}
2092
2093static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 2094 const struct nft_expr_info *info,
96518518
PM		 2095 struct nft_expr *expr)
2096{
2097 const struct nft_expr_ops *ops = info->ops;
2098 int err;
2099
2100 expr->ops = ops;
2101 if (ops->init) {
ef1f7df9 2102 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 2103 if (err < 0)
2104 goto err1;
2105 }
2106
96518518 2107 return 0;
96518518
PM		 2108err1:
2109 expr->ops = NULL;
2110 return err;
2111}
2112
62472bce
PM		 2113static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2114 struct nft_expr *expr)
96518518
PM		 2115{
2116 if (expr->ops->destroy)
62472bce 2117 expr->ops->destroy(ctx, expr);
ef1f7df9 2118 module_put(expr->ops->type->owner);
96518518
PM		 2119}
2120
0b2d8a7b
PM		 2121struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2122 const struct nlattr *nla)
2123{
2124 struct nft_expr_info info;
2125 struct nft_expr *expr;
2126 int err;
2127
2128 err = nf_tables_expr_parse(ctx, nla, &info);
2129 if (err < 0)
2130 goto err1;
2131
2132 err = -ENOMEM;
2133 expr = kzalloc(info.ops->size, GFP_KERNEL);
2134 if (expr == NULL)
2135 goto err2;
2136
2137 err = nf_tables_newexpr(ctx, &info, expr);
2138 if (err < 0)
6cafaf47 2139 goto err3;
0b2d8a7b
PM		 2140
2141 return expr;
6cafaf47
LZ		 2142err3:
2143 kfree(expr);
0b2d8a7b
PM		 2144err2:
2145 module_put(info.ops->type->owner);
2146err1:
2147 return ERR_PTR(err);
2148}
2149
2150void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2151{
2152 nf_tables_expr_destroy(ctx, expr);
2153 kfree(expr);
2154}
2155
96518518
PM		 2156/*
2157 * Rules
2158 */
2159
cac20fcd
PNA		 2160static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2161 u64 handle)
96518518
PM		 2162{
2163 struct nft_rule *rule;
2164
2165 // FIXME: this sucks
d9adf22a 2166 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 2167 if (handle == rule->handle)
2168 return rule;
2169 }
2170
2171 return ERR_PTR(-ENOENT);
2172}
2173
cac20fcd
PNA		 2174static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2175 const struct nlattr *nla)
96518518
PM		 2176{
2177 if (nla == NULL)
2178 return ERR_PTR(-EINVAL);
2179
cac20fcd 2180 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 2181}
2182
2183static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 2184 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2185 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 2186 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2187 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2188 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2189 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 2190 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 2191 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 2192 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2193 .len = NFT_USERDATA_MAXLEN },
467697d2 2194 [NFTA_RULE_ID] = { .type = NLA_U32 },
96518518
PM		 2195};
2196
84d7fce6
PNA		 2197static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2198 u32 portid, u32 seq, int event,
2199 u32 flags, int family,
96518518
PM		 2200 const struct nft_table *table,
2201 const struct nft_chain *chain,
2202 const struct nft_rule *rule)
2203{
2204 struct nlmsghdr *nlh;
2205 struct nfgenmsg *nfmsg;
2206 const struct nft_expr *expr, *next;
2207 struct nlattr *list;
5e948466 2208 const struct nft_rule *prule;
dedb67c4 2209 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 2210
dedb67c4 2211 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 2212 if (nlh == NULL)
2213 goto nla_put_failure;
2214
2215 nfmsg = nlmsg_data(nlh);
2216 nfmsg->nfgen_family = family;
2217 nfmsg->version = NFNETLINK_V0;
84d7fce6 2218 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 2219
2220 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2221 goto nla_put_failure;
2222 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2223 goto nla_put_failure;
b46f6ded
ND		 2224 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2225 NFTA_RULE_PAD))
96518518
PM		 2226 goto nla_put_failure;
2227
5e948466 2228 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
cbbb40e2 2229 prule = list_prev_entry(rule, list);
5e948466 2230 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 2231 cpu_to_be64(prule->handle),
2232 NFTA_RULE_PAD))
5e948466
EL		 2233 goto nla_put_failure;
2234 }
2235
96518518
PM		 2236 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2237 if (list == NULL)
2238 goto nla_put_failure;
2239 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 2240 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 2241 goto nla_put_failure;
96518518
PM		 2242 }
2243 nla_nest_end(skb, list);
2244
86f1ec32
PM		 2245 if (rule->udata) {
2246 struct nft_userdata *udata = nft_userdata(rule);
2247 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2248 udata->data) < 0)
2249 goto nla_put_failure;
2250 }
0768b3b3 2251
053c095a
JB		 2252 nlmsg_end(skb, nlh);
2253 return 0;
96518518
PM		 2254
2255nla_put_failure:
2256 nlmsg_trim(skb, nlh);
2257 return -1;
2258}
2259
25e94a99
PNA		 2260static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2261 const struct nft_rule *rule, int event)
96518518
PM		 2262{
2263 struct sk_buff *skb;
96518518
PM		 2264 int err;
2265
128ad332
PNA		 2266 if (!ctx->report &&
2267 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2268 return;
96518518 2269
96518518
PM		 2270 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2271 if (skb == NULL)
2272 goto err;
2273
84d7fce6 2274 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 2275 event, 0, ctx->family, ctx->table,
35151d84 2276 ctx->chain, rule);
96518518
PM		 2277 if (err < 0) {
2278 kfree_skb(skb);
2279 goto err;
2280 }
2281
25e94a99
PNA		 2282 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2283 ctx->report, GFP_KERNEL);
2284 return;
96518518 2285err:
25e94a99 2286 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2287}
2288
6e1f760e 2289struct nft_rule_dump_ctx {
e46abbcc 2290 char *table;
b7263e07 2291 char *chain;
6e1f760e
PNA		 2292};
2293
96518518
PM		 2294static int nf_tables_dump_rules(struct sk_buff *skb,
2295 struct netlink_callback *cb)
2296{
2297 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2298 const struct nft_rule_dump_ctx *ctx = cb->data;
96518518
PM		 2299 const struct nft_table *table;
2300 const struct nft_chain *chain;
2301 const struct nft_rule *rule;
2302 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 2303 struct net *net = sock_net(skb->sk);
96518518
PM		 2304 int family = nfmsg->nfgen_family;
2305
e688a7f8 2306 rcu_read_lock();
38e029f1
PNA		 2307 cb->seq = net->nft.base_seq;
2308
36596dad 2309 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 2310 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 2311 continue;
2312
2313 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 2314 continue;
2315
36596dad
PNA		 2316 list_for_each_entry_rcu(chain, &table->chains, list) {
2317 if (ctx && ctx->chain &&
2318 strcmp(ctx->chain, chain->name) != 0)
6e1f760e
PNA		 2319 continue;
2320
36596dad
PNA		 2321 list_for_each_entry_rcu(rule, &chain->rules, list) {
2322 if (!nft_is_active(net, rule))
2323 goto cont;
2324 if (idx < s_idx)
2325 goto cont;
2326 if (idx > s_idx)
2327 memset(&cb->args[1], 0,
2328 sizeof(cb->args) - sizeof(cb->args[0]));
2329 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2330 cb->nlh->nlmsg_seq,
2331 NFT_MSG_NEWRULE,
2332 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 2333 table->family,
36596dad
PNA		 2334 table, chain, rule) < 0)
2335 goto done;
2336
2337 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 2338cont:
36596dad 2339 idx++;
96518518
PM		 2340 }
2341 }
2342 }
2343done:
e688a7f8
PNA		 2344 rcu_read_unlock();
2345
96518518
PM		 2346 cb->args[0] = idx;
2347 return skb->len;
2348}
2349
90fd131a
FW		 2350static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2351{
2352 const struct nlattr * const *nla = cb->data;
2353 struct nft_rule_dump_ctx *ctx = NULL;
2354
2355 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2356 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2357 if (!ctx)
2358 return -ENOMEM;
2359
2360 if (nla[NFTA_RULE_TABLE]) {
2361 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2362 GFP_ATOMIC);
2363 if (!ctx->table) {
2364 kfree(ctx);
2365 return -ENOMEM;
2366 }
2367 }
2368 if (nla[NFTA_RULE_CHAIN]) {
2369 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2370 GFP_ATOMIC);
2371 if (!ctx->chain) {
2372 kfree(ctx->table);
2373 kfree(ctx);
2374 return -ENOMEM;
2375 }
2376 }
2377 }
2378
2379 cb->data = ctx;
2380 return 0;
2381}
2382
6e1f760e
PNA		 2383static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2384{
e46abbcc
PS		 2385 struct nft_rule_dump_ctx *ctx = cb->data;
2386
2387 if (ctx) {
2388 kfree(ctx->table);
b7263e07 2389 kfree(ctx->chain);
e46abbcc
PS		 2390 kfree(ctx);
2391 }
6e1f760e
PNA		 2392 return 0;
2393}
2394
d9adf22a 2395/* called with rcu_read_lock held */
7b8002a1
PNA		 2396static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2397 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2398 const struct nlattr * const nla[],
2399 struct netlink_ext_ack *extack)
96518518
PM		 2400{
2401 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2402 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2403 const struct nft_chain *chain;
2404 const struct nft_rule *rule;
1b2470e5 2405 struct nft_table *table;
96518518
PM		 2406 struct sk_buff *skb2;
2407 int family = nfmsg->nfgen_family;
2408 int err;
2409
2410 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2411 struct netlink_dump_control c = {
90fd131a 2412 .start= nf_tables_dump_rules_start,
96518518 2413 .dump = nf_tables_dump_rules,
6e1f760e 2414 .done = nf_tables_dump_rules_done,
d9adf22a 2415 .module = THIS_MODULE,
90fd131a 2416 .data = (void *)nla,
96518518 2417 };
6e1f760e 2418
d9adf22a 2419 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 2420 }
2421
cac20fcd 2422 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2423 if (IS_ERR(table)) {
2424 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2425 return PTR_ERR(table);
36dd1bcc 2426 }
96518518 2427
f102d66b 2428 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 2429 if (IS_ERR(chain)) {
2430 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 2431 return PTR_ERR(chain);
36dd1bcc 2432 }
96518518 2433
cac20fcd 2434 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 2435 if (IS_ERR(rule)) {
2436 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2437 return PTR_ERR(rule);
36dd1bcc 2438 }
96518518 2439
d9adf22a 2440 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 2441 if (!skb2)
2442 return -ENOMEM;
2443
84d7fce6 2444 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 2445 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2446 family, table, chain, rule);
2447 if (err < 0)
2448 goto err;
2449
2450 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2451
2452err:
2453 kfree_skb(skb2);
2454 return err;
2455}
2456
62472bce
PM		 2457static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2458 struct nft_rule *rule)
96518518 2459{
96518518
PM		 2460 struct nft_expr *expr;
2461
2462 /*
2463 * Careful: some expressions might not be initialized in case this
2464 * is called on error from nf_tables_newrule().
2465 */
2466 expr = nft_expr_first(rule);
3e38df13 2467 while (expr != nft_expr_last(rule) && expr->ops) {
62472bce 2468 nf_tables_expr_destroy(ctx, expr);
96518518
PM		 2469 expr = nft_expr_next(expr);
2470 }
2471 kfree(rule);
2472}
2473
bb7b40ae
PNA		 2474static void nf_tables_rule_release(const struct nft_ctx *ctx,
2475 struct nft_rule *rule)
2476{
2477 nft_rule_expr_deactivate(ctx, rule);
2478 nf_tables_rule_destroy(ctx, rule);
2479}
2480
a654de8f
PNA		 2481int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2482{
2483 struct nft_expr *expr, *last;
2484 const struct nft_data *data;
2485 struct nft_rule *rule;
2486 int err;
2487
26b2f552
TY		 2488 if (ctx->level == NFT_JUMP_STACK_SIZE)
2489 return -EMLINK;
2490
a654de8f
PNA		 2491 list_for_each_entry(rule, &chain->rules, list) {
2492 if (!nft_is_active_next(ctx->net, rule))
2493 continue;
2494
2495 nft_rule_for_each_expr(expr, last, rule) {
2496 if (!expr->ops->validate)
2497 continue;
2498
2499 err = expr->ops->validate(ctx, expr, &data);
2500 if (err < 0)
2501 return err;
2502 }
2503 }
2504
2505 return 0;
2506}
2507EXPORT_SYMBOL_GPL(nft_chain_validate);
2508
2509static int nft_table_validate(struct net *net, const struct nft_table *table)
2510{
2511 struct nft_chain *chain;
2512 struct nft_ctx ctx = {
2513 .net = net,
2514 .family = table->family,
2515 };
2516 int err;
2517
2518 list_for_each_entry(chain, &table->chains, list) {
2519 if (!nft_is_base_chain(chain))
2520 continue;
2521
2522 ctx.chain = chain;
2523 err = nft_chain_validate(&ctx, chain);
2524 if (err < 0)
2525 return err;
2526 }
2527
2528 return 0;
2529}
2530
1081d11b
PNA		 2531#define NFT_RULE_MAXEXPRS 128
2532
633c9a84
PNA		 2533static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2534 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2535 const struct nlattr * const nla[],
2536 struct netlink_ext_ack *extack)
96518518
PM		 2537{
2538 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2539 u8 genmask = nft_genmask_next(net);
2a43ecf9 2540 struct nft_expr_info *info = NULL;
98319cb9 2541 int family = nfmsg->nfgen_family;
96518518
PM		 2542 struct nft_table *table;
2543 struct nft_chain *chain;
2544 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2545 struct nft_userdata *udata;
1081d11b 2546 struct nft_trans *trans = NULL;
96518518
PM		 2547 struct nft_expr *expr;
2548 struct nft_ctx ctx;
2549 struct nlattr *tmp;
86f1ec32 2550 unsigned int size, i, n, ulen = 0, usize = 0;
96518518 2551 int err, rem;
5e948466 2552 u64 handle, pos_handle;
96518518 2553
f102d66b
FW		 2554 lockdep_assert_held(&net->nft.commit_mutex);
2555
cac20fcd 2556 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2557 if (IS_ERR(table)) {
2558 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2559 return PTR_ERR(table);
36dd1bcc 2560 }
96518518 2561
f102d66b 2562 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 2563 if (IS_ERR(chain)) {
2564 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 2565 return PTR_ERR(chain);
36dd1bcc 2566 }
96518518
PM		 2567
2568 if (nla[NFTA_RULE_HANDLE]) {
2569 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 2570 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 2571 if (IS_ERR(rule)) {
2572 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2573 return PTR_ERR(rule);
36dd1bcc 2574 }
96518518 2575
36dd1bcc
PNA		 2576 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2577 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2578 return -EEXIST;
36dd1bcc 2579 }
96518518
PM		 2580 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2581 old_rule = rule;
2582 else
2583 return -EOPNOTSUPP;
2584 } else {
445509eb
PNA		 2585 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
2586 nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 2587 return -EINVAL;
2588 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 2589
2590 if (chain->use == UINT_MAX)
2591 return -EOVERFLOW;
5e948466 2592
447750f2
FW		 2593 if (nla[NFTA_RULE_POSITION]) {
2594 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2595 old_rule = __nft_rule_lookup(chain, pos_handle);
2596 if (IS_ERR(old_rule)) {
2597 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
2598 return PTR_ERR(old_rule);
2599 }
36dd1bcc 2600 }
5e948466
EL		 2601 }
2602
98319cb9 2603 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0ca743a5 2604
96518518
PM		 2605 n = 0;
2606 size = 0;
2607 if (nla[NFTA_RULE_EXPRESSIONS]) {
2a43ecf9
FW		 2608 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
2609 sizeof(struct nft_expr_info),
2610 GFP_KERNEL);
2611 if (!info)
2612 return -ENOMEM;
2613
96518518
PM		 2614 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2615 err = -EINVAL;
2616 if (nla_type(tmp) != NFTA_LIST_ELEM)
2617 goto err1;
2618 if (n == NFT_RULE_MAXEXPRS)
2619 goto err1;
0ca743a5 2620 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 2621 if (err < 0)
2622 goto err1;
2623 size += info[n].ops->size;
2624 n++;
2625 }
2626 }
9889840f
PM		 2627 /* Check for overflow of dlen field */
2628 err = -EFBIG;
2629 if (size >= 1 << 12)
2630 goto err1;
96518518 2631
86f1ec32 2632 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 2633 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 2634 if (ulen > 0)
2635 usize = sizeof(struct nft_userdata) + ulen;
2636 }
0768b3b3 2637
96518518 2638 err = -ENOMEM;
86f1ec32 2639 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 2640 if (rule == NULL)
2641 goto err1;
2642
889f7ee7 2643 nft_activate_next(net, rule);
0628b123 2644
96518518
PM		 2645 rule->handle = handle;
2646 rule->dlen = size;
86f1ec32 2647 rule->udata = ulen ? 1 : 0;
0768b3b3 2648
86f1ec32
PM		 2649 if (ulen) {
2650 udata = nft_userdata(rule);
2651 udata->len = ulen - 1;
2652 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2653 }
96518518 2654
96518518
PM		 2655 expr = nft_expr_first(rule);
2656 for (i = 0; i < n; i++) {
2657 err = nf_tables_newexpr(&ctx, &info[i], expr);
2658 if (err < 0)
2659 goto err2;
a654de8f
PNA		 2660
2661 if (info[i].ops->validate)
2662 nft_validate_state_update(net, NFT_VALIDATE_NEED);
2663
ef1f7df9 2664 info[i].ops = NULL;
96518518
PM		 2665 expr = nft_expr_next(expr);
2666 }
2667
96518518 2668 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
569ccae6 2669 if (!nft_is_active_next(net, old_rule)) {
0628b123
PNA		 2670 err = -ENOENT;
2671 goto err2;
2672 }
569ccae6
FW		 2673 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2674 old_rule);
2675 if (trans == NULL) {
2676 err = -ENOMEM;
2677 goto err2;
2678 }
2679 nft_deactivate_next(net, old_rule);
2680 chain->use--;
96518518 2681
569ccae6
FW		 2682 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2683 err = -ENOMEM;
2684 goto err2;
2685 }
2686
2687 list_add_tail_rcu(&rule->list, &old_rule->list);
2688 } else {
2689 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2690 err = -ENOMEM;
2691 goto err2;
2692 }
2693
2694 if (nlh->nlmsg_flags & NLM_F_APPEND) {
2695 if (old_rule)
2696 list_add_rcu(&rule->list, &old_rule->list);
2697 else
2698 list_add_tail_rcu(&rule->list, &chain->rules);
2699 } else {
2700 if (old_rule)
2701 list_add_tail_rcu(&rule->list, &old_rule->list);
2702 else
2703 list_add_rcu(&rule->list, &chain->rules);
2704 }
0628b123 2705 }
2a43ecf9 2706 kvfree(info);
4fefee57 2707 chain->use++;
96518518 2708
a654de8f
PNA		 2709 if (net->nft.validate_state == NFT_VALIDATE_DO)
2710 return nft_table_validate(net, table);
2711
2712 return 0;
96518518 2713err2:
bb7b40ae 2714 nf_tables_rule_release(&ctx, rule);
96518518
PM		 2715err1:
2716 for (i = 0; i < n; i++) {
2717 if (info[i].ops != NULL)
ef1f7df9 2718 module_put(info[i].ops->type->owner);
96518518 2719 }
2a43ecf9 2720 kvfree(info);
96518518
PM		 2721 return err;
2722}
2723
1a94e38d
PNA		 2724static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2725 const struct nlattr *nla)
2726{
2727 u32 id = ntohl(nla_get_be32(nla));
2728 struct nft_trans *trans;
2729
2730 list_for_each_entry(trans, &net->nft.commit_list, list) {
2731 struct nft_rule *rule = nft_trans_rule(trans);
2732
2733 if (trans->msg_type == NFT_MSG_NEWRULE &&
2734 id == nft_trans_rule_id(trans))
2735 return rule;
2736 }
2737 return ERR_PTR(-ENOENT);
2738}
2739
633c9a84
PNA		 2740static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2741 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2742 const struct nlattr * const nla[],
2743 struct netlink_ext_ack *extack)
96518518
PM		 2744{
2745 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2746 u8 genmask = nft_genmask_next(net);
7c95f6d8 2747 struct nft_table *table;
cf9dc09d
PNA		 2748 struct nft_chain *chain = NULL;
2749 struct nft_rule *rule;
0628b123
PNA		 2750 int family = nfmsg->nfgen_family, err = 0;
2751 struct nft_ctx ctx;
96518518 2752
cac20fcd 2753 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2754 if (IS_ERR(table)) {
2755 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2756 return PTR_ERR(table);
36dd1bcc 2757 }
96518518 2758
cf9dc09d 2759 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 2760 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
2761 genmask);
36dd1bcc
PNA		 2762 if (IS_ERR(chain)) {
2763 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 2764 return PTR_ERR(chain);
36dd1bcc 2765 }
cf9dc09d 2766 }
96518518 2767
98319cb9 2768 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0628b123 2769
cf9dc09d
PNA		 2770 if (chain) {
2771 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 2772 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 2773 if (IS_ERR(rule)) {
2774 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 2775 return PTR_ERR(rule);
36dd1bcc 2776 }
96518518 2777
1a94e38d
PNA		 2778 err = nft_delrule(&ctx, rule);
2779 } else if (nla[NFTA_RULE_ID]) {
2780 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 2781 if (IS_ERR(rule)) {
2782 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 2783 return PTR_ERR(rule);
36dd1bcc 2784 }
1a94e38d 2785
5e266fe7 2786 err = nft_delrule(&ctx, rule);
cf9dc09d 2787 } else {
ce24b721 2788 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 2789 }
2790 } else {
2791 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 2792 if (!nft_is_active_next(net, chain))
2793 continue;
2794
cf9dc09d 2795 ctx.chain = chain;
ce24b721 2796 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 2797 if (err < 0)
2798 break;
2799 }
2800 }
2801
2802 return err;
2803}
2804
20a69341
PM		 2805/*
2806 * Sets
2807 */
2808
2b664957 2809static LIST_HEAD(nf_tables_set_types);
20a69341 2810
2b664957 2811int nft_register_set(struct nft_set_type *type)
20a69341
PM		 2812{
2813 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2814 list_add_tail_rcu(&type->list, &nf_tables_set_types);
20a69341
PM		 2815 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2816 return 0;
2817}
2818EXPORT_SYMBOL_GPL(nft_register_set);
2819
2b664957 2820void nft_unregister_set(struct nft_set_type *type)
20a69341
PM		 2821{
2822 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 2823 list_del_rcu(&type->list);
20a69341
PM		 2824 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2825}
2826EXPORT_SYMBOL_GPL(nft_unregister_set);
2827
2b664957 2828#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 2829 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
2830 NFT_SET_EVAL)
2b664957 2831
71cc0873 2832static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 2833{
71cc0873 2834 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 2835}
2836
c50b960c
PM		 2837/*
2838 * Select a set implementation based on the data characteristics and the
2839 * given policy. The total memory use might not be known if no size is
2840 * given, in that case the amount of memory per element is used.
2841 */
2842static const struct nft_set_ops *
2b664957
PNA		 2843nft_select_set_ops(const struct nft_ctx *ctx,
2844 const struct nlattr * const nla[],
c50b960c
PM		 2845 const struct nft_set_desc *desc,
2846 enum nft_set_policies policy)
20a69341 2847{
c50b960c
PM		 2848 const struct nft_set_ops *ops, *bops;
2849 struct nft_set_estimate est, best;
2b664957
PNA		 2850 const struct nft_set_type *type;
2851 u32 flags = 0;
20a69341 2852
f102d66b
FW		 2853 lockdep_assert_held(&ctx->net->nft.commit_mutex);
2854 lockdep_nfnl_nft_mutex_not_held();
20a69341 2855#ifdef CONFIG_MODULES
2b664957 2856 if (list_empty(&nf_tables_set_types)) {
452238e8 2857 nft_request_module(ctx->net, "nft-set");
2b664957 2858 if (!list_empty(&nf_tables_set_types))
20a69341
PM		 2859 return ERR_PTR(-EAGAIN);
2860 }
2861#endif
2b664957
PNA		 2862 if (nla[NFTA_SET_FLAGS] != NULL)
2863 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 2864
55af753c
PNA		 2865 bops = NULL;
2866 best.size = ~0;
2867 best.lookup = ~0;
0b5a7874 2868 best.space = ~0;
c50b960c 2869
2b664957 2870 list_for_each_entry(type, &nf_tables_set_types, list) {
71cc0873 2871 ops = &type->ops;
2b664957 2872
71cc0873 2873 if (!nft_set_ops_candidate(type, flags))
20a69341 2874 continue;
2b664957 2875 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 2876 continue;
2877
2878 switch (policy) {
2879 case NFT_SET_POL_PERFORMANCE:
55af753c 2880 if (est.lookup < best.lookup)
c50b960c 2881 break;
644e334e
PNA		 2882 if (est.lookup == best.lookup &&
2883 est.space < best.space)
2884 break;
c50b960c
PM		 2885 continue;
2886 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 2887 if (!desc->size) {
2888 if (est.space < best.space)
2889 break;
2890 if (est.space == best.space &&
2891 est.lookup < best.lookup)
2892 break;
4f2921ca 2893 } else if (est.size < best.size || !bops) {
c50b960c 2894 break;
0b5a7874 2895 }
c50b960c
PM		 2896 continue;
2897 default:
2898 break;
2899 }
2900
2b664957 2901 if (!try_module_get(type->owner))
20a69341 2902 continue;
c50b960c 2903 if (bops != NULL)
71cc0873 2904 module_put(to_set_type(bops)->owner);
c50b960c
PM		 2905
2906 bops = ops;
2907 best = est;
20a69341
PM		 2908 }
2909
c50b960c
PM		 2910 if (bops != NULL)
2911 return bops;
2912
20a69341
PM		 2913 return ERR_PTR(-EOPNOTSUPP);
2914}
2915
2916static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 2917 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2918 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 2919 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 2920 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 2921 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2922 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2923 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2924 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2925 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 2926 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2927 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 2928 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 2929 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2930 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 2931 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2932 .len = NFT_USERDATA_MAXLEN },
8aeff920 2933 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 2934 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
c50b960c
PM		 2935};
2936
2937static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2938 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
20a69341
PM		 2939};
2940
633c9a84 2941static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 2942 const struct sk_buff *skb,
2943 const struct nlmsghdr *nlh,
f2a6d766 2944 const struct nlattr * const nla[],
36dd1bcc 2945 struct netlink_ext_ack *extack,
f2a6d766 2946 u8 genmask)
20a69341
PM		 2947{
2948 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 2949 int family = nfmsg->nfgen_family;
7c95f6d8 2950 struct nft_table *table = NULL;
20a69341 2951
20a69341 2952 if (nla[NFTA_SET_TABLE] != NULL) {
cac20fcd
PNA		 2953 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
2954 genmask);
36dd1bcc
PNA		 2955 if (IS_ERR(table)) {
2956 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 2957 return PTR_ERR(table);
36dd1bcc 2958 }
20a69341
PM		 2959 }
2960
98319cb9 2961 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 2962 return 0;
2963}
2964
cac20fcd
PNA		 2965static struct nft_set *nft_set_lookup(const struct nft_table *table,
2966 const struct nlattr *nla, u8 genmask)
20a69341
PM		 2967{
2968 struct nft_set *set;
2969
2970 if (nla == NULL)
2971 return ERR_PTR(-EINVAL);
2972
d9adf22a 2973 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 2974 if (!nla_strcmp(nla, set->name) &&
2975 nft_active_genmask(set, genmask))
20a69341
PM		 2976 return set;
2977 }
2978 return ERR_PTR(-ENOENT);
2979}
2980
cac20fcd
PNA		 2981static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
2982 const struct nlattr *nla,
2983 u8 genmask)
3ecbfd65
HS		 2984{
2985 struct nft_set *set;
2986
3ecbfd65
HS		 2987 list_for_each_entry(set, &table->sets, list) {
2988 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
2989 nft_active_genmask(set, genmask))
2990 return set;
2991 }
2992 return ERR_PTR(-ENOENT);
2993}
2994
cac20fcd
PNA		 2995static struct nft_set *nft_set_lookup_byid(const struct net *net,
2996 const struct nlattr *nla, u8 genmask)
958bee14
PNA		 2997{
2998 struct nft_trans *trans;
2999 u32 id = ntohl(nla_get_be32(nla));
3000
3001 list_for_each_entry(trans, &net->nft.commit_list, list) {
9c7f96fd
AK		 3002 if (trans->msg_type == NFT_MSG_NEWSET) {
3003 struct nft_set *set = nft_trans_set(trans);
37a9cc52 3004
9c7f96fd
AK		 3005 if (id == nft_trans_set_id(trans) &&
3006 nft_active_genmask(set, genmask))
3007 return set;
3008 }
958bee14
PNA		 3009 }
3010 return ERR_PTR(-ENOENT);
3011}
c7a72e3f 3012
10659cba
PNA		 3013struct nft_set *nft_set_lookup_global(const struct net *net,
3014 const struct nft_table *table,
3015 const struct nlattr *nla_set_name,
3016 const struct nlattr *nla_set_id,
3017 u8 genmask)
c7a72e3f
PNA		 3018{
3019 struct nft_set *set;
3020
cac20fcd 3021 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 3022 if (IS_ERR(set)) {
3023 if (!nla_set_id)
3024 return set;
3025
cac20fcd 3026 set = nft_set_lookup_byid(net, nla_set_id, genmask);
c7a72e3f
PNA		 3027 }
3028 return set;
3029}
10659cba 3030EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 3031
20a69341
PM		 3032static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3033 const char *name)
3034{
3035 const struct nft_set *i;
3036 const char *p;
3037 unsigned long *inuse;
60eb1894 3038 unsigned int n = 0, min = 0;
20a69341 3039
38745490 3040 p = strchr(name, '%');
20a69341
PM		 3041 if (p != NULL) {
3042 if (p[1] != 'd' || strchr(p + 2, '%'))
3043 return -EINVAL;
3044
3045 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3046 if (inuse == NULL)
3047 return -ENOMEM;
60eb1894 3048cont:
20a69341 3049 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 3050 int tmp;
3051
37a9cc52
PNA		 3052 if (!nft_is_active_next(ctx->net, set))
3053 continue;
14662917 3054 if (!sscanf(i->name, name, &tmp))
20a69341 3055 continue;
60eb1894 3056 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 3057 continue;
14662917 3058
60eb1894 3059 set_bit(tmp - min, inuse);
20a69341
PM		 3060 }
3061
53b70287 3062 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 3063 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3064 min += BITS_PER_BYTE * PAGE_SIZE;
3065 memset(inuse, 0, PAGE_SIZE);
3066 goto cont;
3067 }
20a69341
PM		 3068 free_page((unsigned long)inuse);
3069 }
3070
38745490
PS		 3071 set->name = kasprintf(GFP_KERNEL, name, min + n);
3072 if (!set->name)
3073 return -ENOMEM;
3074
20a69341 3075 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 3076 if (!nft_is_active_next(ctx->net, i))
3077 continue;
e63aaaa6
AY		 3078 if (!strcmp(set->name, i->name)) {
3079 kfree(set->name);
20a69341 3080 return -ENFILE;
e63aaaa6 3081 }
20a69341
PM		 3082 }
3083 return 0;
3084}
3085
8e1102d5
FW		 3086static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3087{
3088 u64 ms = be64_to_cpu(nla_get_be64(nla));
3089 u64 max = (u64)(~((u64)0));
3090
3091 max = div_u64(max, NSEC_PER_MSEC);
3092 if (ms >= max)
3093 return -ERANGE;
3094
3095 ms *= NSEC_PER_MSEC;
3096 *result = nsecs_to_jiffies64(ms);
3097 return 0;
3098}
3099
d6501de8 3100static __be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5
FW		 3101{
3102 u64 ms = jiffies64_to_nsecs(input);
3103
3104 return cpu_to_be64(div_u64(ms, NSEC_PER_MSEC));
3105}
3106
20a69341
PM		 3107static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3108 const struct nft_set *set, u16 event, u16 flags)
3109{
3110 struct nfgenmsg *nfmsg;
3111 struct nlmsghdr *nlh;
c50b960c 3112 struct nlattr *desc;
128ad332
PNA		 3113 u32 portid = ctx->portid;
3114 u32 seq = ctx->seq;
20a69341 3115
dedb67c4 3116 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 3117 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3118 flags);
3119 if (nlh == NULL)
3120 goto nla_put_failure;
3121
3122 nfmsg = nlmsg_data(nlh);
36596dad 3123 nfmsg->nfgen_family = ctx->family;
20a69341 3124 nfmsg->version = NFNETLINK_V0;
84d7fce6 3125 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 3126
3127 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3128 goto nla_put_failure;
3129 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3130 goto nla_put_failure;
3ecbfd65
HS		 3131 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3132 NFTA_SET_PAD))
3133 goto nla_put_failure;
20a69341
PM		 3134 if (set->flags != 0)
3135 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3136 goto nla_put_failure;
3137
3138 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3139 goto nla_put_failure;
3140 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3141 goto nla_put_failure;
3142 if (set->flags & NFT_SET_MAP) {
3143 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3144 goto nla_put_failure;
3145 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3146 goto nla_put_failure;
3147 }
8aeff920
PNA		 3148 if (set->flags & NFT_SET_OBJECT &&
3149 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3150 goto nla_put_failure;
20a69341 3151
761da293 3152 if (set->timeout &&
d3e2a111 3153 nla_put_be64(skb, NFTA_SET_TIMEOUT,
8e1102d5 3154 nf_jiffies64_to_msecs(set->timeout),
b46f6ded 3155 NFTA_SET_PAD))
761da293
PM		 3156 goto nla_put_failure;
3157 if (set->gc_int &&
3158 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3159 goto nla_put_failure;
3160
9363dc4b
AB		 3161 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3162 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3163 goto nla_put_failure;
3164 }
3165
e6d8ecac
CFG		 3166 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3167 goto nla_put_failure;
3168
c50b960c
PM		 3169 desc = nla_nest_start(skb, NFTA_SET_DESC);
3170 if (desc == NULL)
3171 goto nla_put_failure;
3172 if (set->size &&
3173 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3174 goto nla_put_failure;
3175 nla_nest_end(skb, desc);
3176
053c095a
JB		 3177 nlmsg_end(skb, nlh);
3178 return 0;
20a69341
PM		 3179
3180nla_put_failure:
3181 nlmsg_trim(skb, nlh);
3182 return -1;
3183}
3184
25e94a99
PNA		 3185static void nf_tables_set_notify(const struct nft_ctx *ctx,
3186 const struct nft_set *set, int event,
3187 gfp_t gfp_flags)
20a69341
PM		 3188{
3189 struct sk_buff *skb;
128ad332 3190 u32 portid = ctx->portid;
20a69341
PM		 3191 int err;
3192
128ad332
PNA		 3193 if (!ctx->report &&
3194 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3195 return;
20a69341 3196
31f8441c 3197 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 3198 if (skb == NULL)
3199 goto err;
3200
3201 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3202 if (err < 0) {
3203 kfree_skb(skb);
3204 goto err;
3205 }
3206
25e94a99
PNA		 3207 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3208 gfp_flags);
3209 return;
20a69341 3210err:
25e94a99 3211 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 3212}
3213
5b96af77 3214static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 3215{
3216 const struct nft_set *set;
3217 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 3218 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3219 struct net *net = sock_net(skb->sk);
5b96af77 3220 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 3221
3222 if (cb->args[1])
3223 return skb->len;
3224
e688a7f8 3225 rcu_read_lock();
38e029f1
PNA		 3226 cb->seq = net->nft.base_seq;
3227
36596dad
PNA		 3228 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3229 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 3230 ctx->family != table->family)
36596dad
PNA		 3231 continue;
3232
3233 if (ctx->table && ctx->table != table)
5b96af77
PNA		 3234 continue;
3235
36596dad
PNA		 3236 if (cur_table) {
3237 if (cur_table != table)
c9c8e485
PNA		 3238 continue;
3239
36596dad 3240 cur_table = NULL;
c9c8e485 3241 }
36596dad
PNA		 3242 idx = 0;
3243 list_for_each_entry_rcu(set, &table->sets, list) {
3244 if (idx < s_idx)
3245 goto cont;
3246 if (!nft_is_active(net, set))
3247 goto cont;
5b96af77 3248
36596dad
PNA		 3249 ctx_set = *ctx;
3250 ctx_set.table = table;
98319cb9 3251 ctx_set.family = table->family;
c9c8e485 3252
36596dad
PNA		 3253 if (nf_tables_fill_set(skb, &ctx_set, set,
3254 NFT_MSG_NEWSET,
3255 NLM_F_MULTI) < 0) {
3256 cb->args[0] = idx;
3257 cb->args[2] = (unsigned long) table;
3258 goto done;
c9c8e485 3259 }
36596dad 3260 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 3261cont:
36596dad 3262 idx++;
c9c8e485 3263 }
36596dad
PNA		 3264 if (s_idx)
3265 s_idx = 0;
c9c8e485
PNA		 3266 }
3267 cb->args[1] = 1;
3268done:
e688a7f8 3269 rcu_read_unlock();
c9c8e485
PNA		 3270 return skb->len;
3271}
3272
90fd131a
FW		 3273static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3274{
3275 struct nft_ctx *ctx_dump = NULL;
3276
3277 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3278 if (ctx_dump == NULL)
3279 return -ENOMEM;
3280
3281 cb->data = ctx_dump;
3282 return 0;
3283}
3284
5b96af77 3285static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 3286{
5b96af77
PNA		 3287 kfree(cb->data);
3288 return 0;
20a69341
PM		 3289}
3290
d9adf22a 3291/* called with rcu_read_lock held */
7b8002a1
PNA		 3292static int nf_tables_getset(struct net *net, struct sock *nlsk,
3293 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3294 const struct nlattr * const nla[],
3295 struct netlink_ext_ack *extack)
20a69341 3296{
f2a6d766 3297 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3298 const struct nft_set *set;
3299 struct nft_ctx ctx;
3300 struct sk_buff *skb2;
c9c8e485 3301 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 3302 int err;
3303
01cfa0a4 3304 /* Verify existence before starting dump */
36dd1bcc
PNA		 3305 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3306 genmask);
20a69341
PM		 3307 if (err < 0)
3308 return err;
3309
3310 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3311 struct netlink_dump_control c = {
90fd131a 3312 .start = nf_tables_dump_sets_start,
20a69341 3313 .dump = nf_tables_dump_sets,
5b96af77 3314 .done = nf_tables_dump_sets_done,
90fd131a 3315 .data = &ctx,
d9adf22a 3316 .module = THIS_MODULE,
20a69341 3317 };
5b96af77 3318
d9adf22a 3319 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
20a69341
PM		 3320 }
3321
c9c8e485
PNA		 3322 /* Only accept unspec with dump */
3323 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3324 return -EAFNOSUPPORT;
eaa2bcd6
PT		 3325 if (!nla[NFTA_SET_TABLE])
3326 return -EINVAL;
c9c8e485 3327
cac20fcd 3328 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3329 if (IS_ERR(set))
3330 return PTR_ERR(set);
3331
d9adf22a 3332 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 3333 if (skb2 == NULL)
3334 return -ENOMEM;
3335
3336 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3337 if (err < 0)
3338 goto err;
3339
3340 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3341
3342err:
3343 kfree_skb(skb2);
3344 return err;
3345}
3346
c50b960c
PM		 3347static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3348 struct nft_set_desc *desc,
3349 const struct nlattr *nla)
3350{
3351 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3352 int err;
3353
fceb6435
JB		 3354 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3355 nft_set_desc_policy, NULL);
c50b960c
PM		 3356 if (err < 0)
3357 return err;
3358
3359 if (da[NFTA_SET_DESC_SIZE] != NULL)
3360 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3361
3362 return 0;
3363}
3364
633c9a84
PNA		 3365static int nf_tables_newset(struct net *net, struct sock *nlsk,
3366 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3367 const struct nlattr * const nla[],
3368 struct netlink_ext_ack *extack)
20a69341
PM		 3369{
3370 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3371 u8 genmask = nft_genmask_next(net);
98319cb9 3372 int family = nfmsg->nfgen_family;
20a69341 3373 const struct nft_set_ops *ops;
20a69341
PM		 3374 struct nft_table *table;
3375 struct nft_set *set;
3376 struct nft_ctx ctx;
38745490 3377 char *name;
4ef360dd 3378 u64 size;
761da293 3379 u64 timeout;
8aeff920 3380 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 3381 struct nft_set_desc desc;
e6d8ecac
CFG		 3382 unsigned char *udata;
3383 u16 udlen;
20a69341
PM		 3384 int err;
3385
3386 if (nla[NFTA_SET_TABLE] == NULL ||
3387 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 3388 nla[NFTA_SET_KEY_LEN] == NULL ||
3389 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 3390 return -EINVAL;
3391
c50b960c
PM		 3392 memset(&desc, 0, sizeof(desc));
3393
20a69341
PM		 3394 ktype = NFT_DATA_VALUE;
3395 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3396 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3397 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3398 return -EINVAL;
3399 }
3400
c50b960c 3401 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 3402 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3403 return -EINVAL;
3404
3405 flags = 0;
3406 if (nla[NFTA_SET_FLAGS] != NULL) {
3407 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3408 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 3409 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 3410 NFT_SET_MAP | NFT_SET_EVAL |
3411 NFT_SET_OBJECT))
20a69341 3412 return -EINVAL;
8aeff920
PNA		 3413 /* Only one of these operations is supported */
3414 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3415 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3416 return -EOPNOTSUPP;
20a69341
PM		 3417 }
3418
3419 dtype = 0;
20a69341
PM		 3420 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3421 if (!(flags & NFT_SET_MAP))
3422 return -EINVAL;
3423
3424 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3425 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3426 dtype != NFT_DATA_VERDICT)
3427 return -EINVAL;
3428
3429 if (dtype != NFT_DATA_VERDICT) {
3430 if (nla[NFTA_SET_DATA_LEN] == NULL)
3431 return -EINVAL;
c50b960c 3432 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 3433 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3434 return -EINVAL;
3435 } else
7d740264 3436 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 3437 } else if (flags & NFT_SET_MAP)
3438 return -EINVAL;
3439
8aeff920
PNA		 3440 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3441 if (!(flags & NFT_SET_OBJECT))
3442 return -EINVAL;
3443
3444 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3445 if (objtype == NFT_OBJECT_UNSPEC ||
3446 objtype > NFT_OBJECT_MAX)
3447 return -EINVAL;
3448 } else if (flags & NFT_SET_OBJECT)
3449 return -EINVAL;
3450 else
3451 objtype = NFT_OBJECT_UNSPEC;
3452
761da293
PM		 3453 timeout = 0;
3454 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3455 if (!(flags & NFT_SET_TIMEOUT))
3456 return -EINVAL;
8e1102d5
FW		 3457
3458 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
3459 if (err)
3460 return err;
761da293
PM		 3461 }
3462 gc_int = 0;
3463 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3464 if (!(flags & NFT_SET_TIMEOUT))
3465 return -EINVAL;
3466 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3467 }
3468
c50b960c
PM		 3469 policy = NFT_SET_POL_PERFORMANCE;
3470 if (nla[NFTA_SET_POLICY] != NULL)
3471 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3472
3473 if (nla[NFTA_SET_DESC] != NULL) {
3474 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3475 if (err < 0)
3476 return err;
3477 }
3478
cac20fcd 3479 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
36dd1bcc
PNA		 3480 if (IS_ERR(table)) {
3481 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 3482 return PTR_ERR(table);
36dd1bcc 3483 }
20a69341 3484
98319cb9 3485 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
20a69341 3486
cac20fcd 3487 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 3488 if (IS_ERR(set)) {
36dd1bcc
PNA		 3489 if (PTR_ERR(set) != -ENOENT) {
3490 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 3491 return PTR_ERR(set);
36dd1bcc 3492 }
1a28ad74 3493 } else {
36dd1bcc
PNA		 3494 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3495 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 3496 return -EEXIST;
36dd1bcc 3497 }
20a69341
PM		 3498 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3499 return -EOPNOTSUPP;
36dd1bcc 3500
20a69341
PM		 3501 return 0;
3502 }
3503
3504 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3505 return -ENOENT;
3506
2b664957 3507 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 3508 if (IS_ERR(ops))
3509 return PTR_ERR(ops);
3510
e6d8ecac
CFG		 3511 udlen = 0;
3512 if (nla[NFTA_SET_USERDATA])
3513 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3514
20a69341
PM		 3515 size = 0;
3516 if (ops->privsize != NULL)
347b408d 3517 size = ops->privsize(nla, &desc);
20a69341 3518
1ff75a3e
PNA		 3519 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3520 if (!set) {
3521 err = -ENOMEM;
20a69341 3522 goto err1;
1ff75a3e 3523 }
20a69341 3524
38745490
PS		 3525 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3526 if (!name) {
3527 err = -ENOMEM;
3528 goto err2;
3529 }
3530
20a69341 3531 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 3532 kfree(name);
20a69341
PM		 3533 if (err < 0)
3534 goto err2;
3535
e6d8ecac
CFG		 3536 udata = NULL;
3537 if (udlen) {
3538 udata = set->data + size;
3539 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3540 }
3541
20a69341 3542 INIT_LIST_HEAD(&set->bindings);
3453c927
PNA		 3543 set->table = table;
3544 write_pnet(&set->net, net);
20a69341
PM		 3545 set->ops = ops;
3546 set->ktype = ktype;
c50b960c 3547 set->klen = desc.klen;
20a69341 3548 set->dtype = dtype;
8aeff920 3549 set->objtype = objtype;
c50b960c 3550 set->dlen = desc.dlen;
20a69341 3551 set->flags = flags;
c50b960c 3552 set->size = desc.size;
9363dc4b 3553 set->policy = policy;
e6d8ecac
CFG		 3554 set->udlen = udlen;
3555 set->udata = udata;
761da293
PM		 3556 set->timeout = timeout;
3557 set->gc_int = gc_int;
3ecbfd65 3558 set->handle = nf_tables_alloc_handle(table);
20a69341 3559
c50b960c 3560 err = ops->init(set, &desc, nla);
20a69341 3561 if (err < 0)
2f6adf48 3562 goto err3;
20a69341 3563
958bee14 3564 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 3565 if (err < 0)
2f6adf48 3566 goto err4;
20a69341 3567
e688a7f8 3568 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 3569 table->use++;
20a69341
PM		 3570 return 0;
3571
2f6adf48 3572err4:
c17c3cdf 3573 ops->destroy(set);
2f6adf48
FW		 3574err3:
3575 kfree(set->name);
20a69341 3576err2:
1ff75a3e 3577 kvfree(set);
20a69341 3578err1:
71cc0873 3579 module_put(to_set_type(ops)->owner);
20a69341
PM		 3580 return err;
3581}
3582
958bee14 3583static void nft_set_destroy(struct nft_set *set)
20a69341 3584{
20a69341 3585 set->ops->destroy(set);
71cc0873 3586 module_put(to_set_type(set->ops)->owner);
38745490 3587 kfree(set->name);
1ff75a3e 3588 kvfree(set);
20a69341
PM		 3589}
3590
633c9a84
PNA		 3591static int nf_tables_delset(struct net *net, struct sock *nlsk,
3592 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3593 const struct nlattr * const nla[],
3594 struct netlink_ext_ack *extack)
20a69341 3595{
c9c8e485 3596 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3597 u8 genmask = nft_genmask_next(net);
36dd1bcc 3598 const struct nlattr *attr;
20a69341
PM		 3599 struct nft_set *set;
3600 struct nft_ctx ctx;
3601 int err;
3602
ec2c9935
PM		 3603 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3604 return -EAFNOSUPPORT;
20a69341
PM		 3605 if (nla[NFTA_SET_TABLE] == NULL)
3606 return -EINVAL;
3607
36dd1bcc
PNA		 3608 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3609 genmask);
20a69341
PM		 3610 if (err < 0)
3611 return err;
3612
36dd1bcc
PNA		 3613 if (nla[NFTA_SET_HANDLE]) {
3614 attr = nla[NFTA_SET_HANDLE];
3615 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
3616 } else {
3617 attr = nla[NFTA_SET_NAME];
3618 set = nft_set_lookup(ctx.table, attr, genmask);
3619 }
a8278400 3620
36dd1bcc
PNA		 3621 if (IS_ERR(set)) {
3622 NL_SET_BAD_ATTR(extack, attr);
3623 return PTR_ERR(set);
3624 }
a8278400 3625 if (!list_empty(&set->bindings) ||
36dd1bcc
PNA		 3626 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
3627 NL_SET_BAD_ATTR(extack, attr);
20a69341 3628 return -EBUSY;
36dd1bcc 3629 }
20a69341 3630
ee01d542 3631 return nft_delset(&ctx, set);
20a69341
PM		 3632}
3633
3634static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 3635 struct nft_set *set,
20a69341 3636 const struct nft_set_iter *iter,
de70185d 3637 struct nft_set_elem *elem)
20a69341 3638{
fe2811eb 3639 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3640 enum nft_registers dreg;
3641
3642 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 3643 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3644 set->dtype == NFT_DATA_VERDICT ?
3645 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3646 set->dlen);
20a69341
PM		 3647}
3648
3649int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3650 struct nft_set_binding *binding)
3651{
3652 struct nft_set_binding *i;
3653 struct nft_set_iter iter;
3654
408070d6 3655 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 3656 return -EBUSY;
3657
11113e19 3658 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 3659 /* If the set is already bound to the same chain all
3660 * jumps are already validated for that chain.
3661 */
3662 list_for_each_entry(i, &set->bindings, list) {
a4684402 3663 if (i->flags & NFT_SET_MAP &&
11113e19 3664 i->chain == binding->chain)
20a69341
PM		 3665 goto bind;
3666 }
3667
8588ac09 3668 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 3669 iter.skip = 0;
3670 iter.count = 0;
3671 iter.err = 0;
3672 iter.fn = nf_tables_bind_check_setelem;
3673
3674 set->ops->walk(ctx, set, &iter);
a02f4248 3675 if (iter.err < 0)
20a69341 3676 return iter.err;
20a69341
PM		 3677 }
3678bind:
3679 binding->chain = ctx->chain;
e688a7f8 3680 list_add_tail_rcu(&binding->list, &set->bindings);
20a69341
PM		 3681 return 0;
3682}
63aea290 3683EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341 3684
cd5125d8 3685void nf_tables_rebind_set(const struct nft_ctx *ctx, struct nft_set *set,
20a69341 3686 struct nft_set_binding *binding)
cd5125d8
FW		 3687{
3688 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3689 nft_is_active(ctx->net, set))
3690 list_add_tail_rcu(&set->list, &ctx->table->sets);
3691
3692 list_add_tail_rcu(&binding->list, &set->bindings);
3693}
3694EXPORT_SYMBOL_GPL(nf_tables_rebind_set);
3695
3696void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3697 struct nft_set_binding *binding)
20a69341 3698{
e688a7f8 3699 list_del_rcu(&binding->list);
20a69341 3700
408070d6 3701 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
37a9cc52 3702 nft_is_active(ctx->net, set))
cd5125d8 3703 list_del_rcu(&set->list);
20a69341 3704}
63aea290 3705EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
20a69341 3706
cd5125d8
FW		 3707void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
3708{
3709 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3710 nft_is_active(ctx->net, set)) {
3711 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3712 nft_set_destroy(set);
3713 }
3714}
3715EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
3716
3ac4c07a
PM		 3717const struct nft_set_ext_type nft_set_ext_types[] = {
3718 [NFT_SET_EXT_KEY] = {
7d740264 3719 .align = __alignof__(u32),
3ac4c07a
PM		 3720 },
3721 [NFT_SET_EXT_DATA] = {
7d740264 3722 .align = __alignof__(u32),
3ac4c07a 3723 },
f25ad2e9
PM		 3724 [NFT_SET_EXT_EXPR] = {
3725 .align = __alignof__(struct nft_expr),
3726 },
8aeff920
PNA		 3727 [NFT_SET_EXT_OBJREF] = {
3728 .len = sizeof(struct nft_object *),
3729 .align = __alignof__(struct nft_object *),
3730 },
3ac4c07a
PM		 3731 [NFT_SET_EXT_FLAGS] = {
3732 .len = sizeof(u8),
3733 .align = __alignof__(u8),
3734 },
c3e1b005
PM		 3735 [NFT_SET_EXT_TIMEOUT] = {
3736 .len = sizeof(u64),
3737 .align = __alignof__(u64),
3738 },
3739 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 3740 .len = sizeof(u64),
3741 .align = __alignof__(u64),
c3e1b005 3742 },
68e942e8
PM		 3743 [NFT_SET_EXT_USERDATA] = {
3744 .len = sizeof(struct nft_userdata),
3745 .align = __alignof__(struct nft_userdata),
3746 },
3ac4c07a
PM		 3747};
3748EXPORT_SYMBOL_GPL(nft_set_ext_types);
3749
20a69341
PM		 3750/*
3751 * Set elements
3752 */
3753
3754static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3755 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3756 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3757 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 3758 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
68e942e8
PM		 3759 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3760 .len = NFT_USERDATA_MAXLEN },
467697d2
FW		 3761 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
3762 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
20a69341
PM		 3763};
3764
3765static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 3766 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3767 .len = NFT_TABLE_MAXNAMELEN - 1 },
3768 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3769 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 3770 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 3771 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 3772};
3773
633c9a84 3774static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3775 const struct sk_buff *skb,
3776 const struct nlmsghdr *nlh,
f2a6d766 3777 const struct nlattr * const nla[],
36dd1bcc 3778 struct netlink_ext_ack *extack,
f2a6d766 3779 u8 genmask)
20a69341
PM		 3780{
3781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 3782 int family = nfmsg->nfgen_family;
7c95f6d8 3783 struct nft_table *table;
20a69341 3784
cac20fcd
PNA		 3785 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
3786 genmask);
36dd1bcc
PNA		 3787 if (IS_ERR(table)) {
3788 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341 3789 return PTR_ERR(table);
36dd1bcc 3790 }
20a69341 3791
98319cb9 3792 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 3793 return 0;
3794}
3795
3796static int nf_tables_fill_setelem(struct sk_buff *skb,
3797 const struct nft_set *set,
3798 const struct nft_set_elem *elem)
3799{
fe2811eb 3800 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 3801 unsigned char *b = skb_tail_pointer(skb);
3802 struct nlattr *nest;
3803
3804 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3805 if (nest == NULL)
3806 goto nla_put_failure;
3807
fe2811eb
PM		 3808 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3809 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 3810 goto nla_put_failure;
3811
fe2811eb
PM		 3812 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3813 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 3814 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3815 set->dlen) < 0)
3816 goto nla_put_failure;
3817
f25ad2e9
PM		 3818 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3819 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3820 goto nla_put_failure;
3821
8aeff920
PNA		 3822 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3823 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3824 (*nft_set_ext_obj(ext))->name) < 0)
3825 goto nla_put_failure;
3826
fe2811eb
PM		 3827 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3828 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3829 htonl(*nft_set_ext_flags(ext))))
3830 goto nla_put_failure;
20a69341 3831
c3e1b005
PM		 3832 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3833 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 3834 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 3835 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3836 goto nla_put_failure;
3837
3838 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 3839 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 3840
3841 expires = *nft_set_ext_expiration(ext);
8e1102d5 3842 if (time_before64(now, expires))
c3e1b005
PM		 3843 expires -= now;
3844 else
3845 expires = 0;
3846
3847 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 3848 nf_jiffies64_to_msecs(expires),
b46f6ded 3849 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 3850 goto nla_put_failure;
3851 }
3852
68e942e8
PM		 3853 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3854 struct nft_userdata *udata;
3855
3856 udata = nft_set_ext_userdata(ext);
3857 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3858 udata->len + 1, udata->data))
3859 goto nla_put_failure;
3860 }
3861
20a69341
PM		 3862 nla_nest_end(skb, nest);
3863 return 0;
3864
3865nla_put_failure:
3866 nlmsg_trim(skb, b);
3867 return -EMSGSIZE;
3868}
3869
3870struct nft_set_dump_args {
3871 const struct netlink_callback *cb;
3872 struct nft_set_iter iter;
3873 struct sk_buff *skb;
3874};
3875
3876static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 3877 struct nft_set *set,
20a69341 3878 const struct nft_set_iter *iter,
de70185d 3879 struct nft_set_elem *elem)
20a69341
PM		 3880{
3881 struct nft_set_dump_args *args;
3882
3883 args = container_of(iter, struct nft_set_dump_args, iter);
3884 return nf_tables_fill_setelem(args->skb, set, elem);
3885}
3886
fa803605
LZ		 3887struct nft_set_dump_ctx {
3888 const struct nft_set *set;
3889 struct nft_ctx ctx;
3890};
3891
20a69341
PM		 3892static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3893{
fa803605 3894 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 3895 struct net *net = sock_net(skb->sk);
fa803605 3896 struct nft_table *table;
de70185d 3897 struct nft_set *set;
20a69341 3898 struct nft_set_dump_args args;
fa803605 3899 bool set_found = false;
20a69341
PM		 3900 struct nfgenmsg *nfmsg;
3901 struct nlmsghdr *nlh;
3902 struct nlattr *nest;
3903 u32 portid, seq;
fa803605 3904 int event;
20a69341 3905
fa803605 3906 rcu_read_lock();
36596dad
PNA		 3907 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3908 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 3909 dump_ctx->ctx.family != table->family)
fa803605 3910 continue;
20a69341 3911
36596dad
PNA		 3912 if (table != dump_ctx->ctx.table)
3913 continue;
20a69341 3914
36596dad
PNA		 3915 list_for_each_entry_rcu(set, &table->sets, list) {
3916 if (set == dump_ctx->set) {
3917 set_found = true;
3918 break;
fa803605 3919 }
fa803605
LZ		 3920 }
3921 break;
3922 }
3923
3924 if (!set_found) {
3925 rcu_read_unlock();
3926 return -ENOENT;
3927 }
20a69341 3928
dedb67c4 3929 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 3930 portid = NETLINK_CB(cb->skb).portid;
3931 seq = cb->nlh->nlmsg_seq;
3932
3933 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3934 NLM_F_MULTI);
3935 if (nlh == NULL)
3936 goto nla_put_failure;
3937
3938 nfmsg = nlmsg_data(nlh);
98319cb9 3939 nfmsg->nfgen_family = table->family;
20a69341 3940 nfmsg->version = NFNETLINK_V0;
fa803605 3941 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 3942
fa803605 3943 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 3944 goto nla_put_failure;
3945 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3946 goto nla_put_failure;
3947
3948 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3949 if (nest == NULL)
3950 goto nla_put_failure;
3951
8588ac09
PNA		 3952 args.cb = cb;
3953 args.skb = skb;
fa803605 3954 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 3955 args.iter.skip = cb->args[0];
3956 args.iter.count = 0;
3957 args.iter.err = 0;
3958 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 3959 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3960 rcu_read_unlock();
20a69341
PM		 3961
3962 nla_nest_end(skb, nest);
3963 nlmsg_end(skb, nlh);
3964
3965 if (args.iter.err && args.iter.err != -EMSGSIZE)
3966 return args.iter.err;
3967 if (args.iter.count == cb->args[0])
3968 return 0;
3969
3970 cb->args[0] = args.iter.count;
3971 return skb->len;
3972
3973nla_put_failure:
fa803605 3974 rcu_read_unlock();
20a69341
PM		 3975 return -ENOSPC;
3976}
3977
90fd131a
FW		 3978static int nf_tables_dump_set_start(struct netlink_callback *cb)
3979{
3980 struct nft_set_dump_ctx *dump_ctx = cb->data;
3981
3982 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
3983
3984 return cb->data ? 0 : -ENOMEM;
3985}
3986
fa803605
LZ		 3987static int nf_tables_dump_set_done(struct netlink_callback *cb)
3988{
3989 kfree(cb->data);
3990 return 0;
3991}
3992
d60ce62f
AB		 3993static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3994 const struct nft_ctx *ctx, u32 seq,
3995 u32 portid, int event, u16 flags,
3996 const struct nft_set *set,
3997 const struct nft_set_elem *elem)
3998{
3999 struct nfgenmsg *nfmsg;
4000 struct nlmsghdr *nlh;
4001 struct nlattr *nest;
4002 int err;
4003
dedb67c4 4004 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 4005 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4006 flags);
4007 if (nlh == NULL)
4008 goto nla_put_failure;
4009
4010 nfmsg = nlmsg_data(nlh);
36596dad 4011 nfmsg->nfgen_family = ctx->family;
d60ce62f 4012 nfmsg->version = NFNETLINK_V0;
84d7fce6 4013 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 4014
4015 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4016 goto nla_put_failure;
4017 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4018 goto nla_put_failure;
4019
4020 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4021 if (nest == NULL)
4022 goto nla_put_failure;
4023
4024 err = nf_tables_fill_setelem(skb, set, elem);
4025 if (err < 0)
4026 goto nla_put_failure;
4027
4028 nla_nest_end(skb, nest);
4029
053c095a
JB		 4030 nlmsg_end(skb, nlh);
4031 return 0;
d60ce62f
AB		 4032
4033nla_put_failure:
4034 nlmsg_trim(skb, nlh);
4035 return -1;
4036}
4037
ba0e4d99
PNA		 4038static int nft_setelem_parse_flags(const struct nft_set *set,
4039 const struct nlattr *attr, u32 *flags)
4040{
4041 if (attr == NULL)
4042 return 0;
4043
4044 *flags = ntohl(nla_get_be32(attr));
4045 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4046 return -EINVAL;
4047 if (!(set->flags & NFT_SET_INTERVAL) &&
4048 *flags & NFT_SET_ELEM_INTERVAL_END)
4049 return -EINVAL;
4050
4051 return 0;
4052}
4053
4054static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4055 const struct nlattr *attr)
4056{
4057 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 4058 struct nft_data_desc desc;
4059 struct nft_set_elem elem;
4060 struct sk_buff *skb;
4061 uint32_t flags = 0;
4062 void *priv;
4063 int err;
4064
4065 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4066 nft_set_elem_policy, NULL);
4067 if (err < 0)
4068 return err;
4069
4070 if (!nla[NFTA_SET_ELEM_KEY])
4071 return -EINVAL;
4072
4073 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4074 if (err < 0)
4075 return err;
4076
4077 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4078 nla[NFTA_SET_ELEM_KEY]);
4079 if (err < 0)
4080 return err;
4081
4082 err = -EINVAL;
4083 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4084 return err;
4085
4086 priv = set->ops->get(ctx->net, set, &elem, flags);
4087 if (IS_ERR(priv))
4088 return PTR_ERR(priv);
4089
4090 elem.priv = priv;
ba0e4d99
PNA		 4091
4092 err = -ENOMEM;
d9adf22a 4093 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99
PNA		 4094 if (skb == NULL)
4095 goto err1;
4096
4097 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4098 NFT_MSG_NEWSETELEM, 0, set, &elem);
4099 if (err < 0)
4100 goto err2;
4101
4102 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4103 /* This avoids a loop in nfnetlink. */
4104 if (err < 0)
4105 goto err1;
4106
4107 return 0;
4108err2:
4109 kfree_skb(skb);
4110err1:
4111 /* this avoids a loop in nfnetlink. */
4112 return err == -EAGAIN ? -ENOBUFS : err;
4113}
4114
d9adf22a 4115/* called with rcu_read_lock held */
ba0e4d99
PNA		 4116static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4117 struct sk_buff *skb, const struct nlmsghdr *nlh,
4118 const struct nlattr * const nla[],
4119 struct netlink_ext_ack *extack)
4120{
4121 u8 genmask = nft_genmask_cur(net);
4122 struct nft_set *set;
4123 struct nlattr *attr;
4124 struct nft_ctx ctx;
4125 int rem, err = 0;
4126
36dd1bcc
PNA		 4127 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4128 genmask);
ba0e4d99
PNA		 4129 if (err < 0)
4130 return err;
4131
cac20fcd 4132 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 4133 if (IS_ERR(set))
4134 return PTR_ERR(set);
4135
4136 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4137 struct netlink_dump_control c = {
90fd131a 4138 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 4139 .dump = nf_tables_dump_set,
4140 .done = nf_tables_dump_set_done,
d9adf22a 4141 .module = THIS_MODULE,
ba0e4d99 4142 };
90fd131a
FW		 4143 struct nft_set_dump_ctx dump_ctx = {
4144 .set = set,
4145 .ctx = ctx,
4146 };
ba0e4d99 4147
90fd131a 4148 c.data = &dump_ctx;
d9adf22a 4149 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
ba0e4d99
PNA		 4150 }
4151
4152 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4153 return -EINVAL;
4154
4155 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4156 err = nft_get_set_elem(&ctx, set, attr);
4157 if (err < 0)
4158 break;
4159 }
4160
4161 return err;
4162}
4163
25e94a99
PNA		 4164static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4165 const struct nft_set *set,
4166 const struct nft_set_elem *elem,
4167 int event, u16 flags)
d60ce62f 4168{
128ad332
PNA		 4169 struct net *net = ctx->net;
4170 u32 portid = ctx->portid;
d60ce62f
AB		 4171 struct sk_buff *skb;
4172 int err;
4173
128ad332 4174 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4175 return;
d60ce62f 4176
d60ce62f
AB		 4177 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4178 if (skb == NULL)
4179 goto err;
4180
4181 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4182 set, elem);
4183 if (err < 0) {
4184 kfree_skb(skb);
4185 goto err;
4186 }
4187
25e94a99
PNA		 4188 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4189 GFP_KERNEL);
4190 return;
d60ce62f 4191err:
25e94a99 4192 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 4193}
4194
60319eb1
PNA		 4195static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4196 int msg_type,
4197 struct nft_set *set)
4198{
4199 struct nft_trans *trans;
4200
4201 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4202 if (trans == NULL)
4203 return NULL;
4204
4205 nft_trans_elem_set(trans) = set;
4206 return trans;
4207}
4208
22fe54d5
PM		 4209void *nft_set_elem_init(const struct nft_set *set,
4210 const struct nft_set_ext_tmpl *tmpl,
49499c3e 4211 const u32 *key, const u32 *data,
22fe54d5 4212 u64 timeout, gfp_t gfp)
fe2811eb
PM		 4213{
4214 struct nft_set_ext *ext;
4215 void *elem;
4216
4217 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4218 if (elem == NULL)
4219 return NULL;
4220
4221 ext = nft_set_elem_ext(set, elem);
4222 nft_set_ext_init(ext, tmpl);
4223
4224 memcpy(nft_set_ext_key(ext), key, set->klen);
4225 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4226 memcpy(nft_set_ext_data(ext), data, set->dlen);
c3e1b005
PM		 4227 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
4228 *nft_set_ext_expiration(ext) =
8e1102d5 4229 get_jiffies_64() + timeout;
c3e1b005
PM		 4230 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4231 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 4232
4233 return elem;
4234}
4235
61f9e292
LZ		 4236void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4237 bool destroy_expr)
61edafbb
PM		 4238{
4239 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 4240 struct nft_ctx ctx = {
4241 .net = read_pnet(&set->net),
4242 .family = set->table->family,
4243 };
61edafbb 4244
59105446 4245 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 4246 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 4247 nft_data_release(nft_set_ext_data(ext), set->dtype);
371ebcbb
PNA		 4248 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4249 struct nft_expr *expr = nft_set_ext_expr(ext);
4250
4251 if (expr->ops->destroy_clone) {
4252 expr->ops->destroy_clone(&ctx, expr);
4253 module_put(expr->ops->type->owner);
4254 } else {
4255 nf_tables_expr_destroy(&ctx, expr);
4256 }
4257 }
8aeff920
PNA		 4258 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4259 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 4260 kfree(elem);
4261}
4262EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4263
59105446
PNA		 4264/* Only called from commit path, nft_set_elem_deactivate() already deals with
4265 * the refcounting from the preparation phase.
4266 */
3453c927
PNA		 4267static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4268 const struct nft_set *set, void *elem)
59105446
PNA		 4269{
4270 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4271
4272 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3453c927 4273 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
59105446
PNA		 4274 kfree(elem);
4275}
4276
60319eb1 4277static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 4278 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 4279{
4280 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 4281 u8 genmask = nft_genmask_next(ctx->net);
20a69341 4282 struct nft_data_desc d1, d2;
fe2811eb 4283 struct nft_set_ext_tmpl tmpl;
c016c7e4 4284 struct nft_set_ext *ext, *ext2;
20a69341
PM		 4285 struct nft_set_elem elem;
4286 struct nft_set_binding *binding;
8aeff920 4287 struct nft_object *obj = NULL;
68e942e8 4288 struct nft_userdata *udata;
fe2811eb 4289 struct nft_data data;
20a69341 4290 enum nft_registers dreg;
60319eb1 4291 struct nft_trans *trans;
0e9091d6 4292 u32 flags = 0;
c3e1b005 4293 u64 timeout;
68e942e8 4294 u8 ulen;
20a69341
PM		 4295 int err;
4296
4297 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4298 nft_set_elem_policy, NULL);
20a69341
PM		 4299 if (err < 0)
4300 return err;
4301
4302 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4303 return -EINVAL;
4304
fe2811eb
PM		 4305 nft_set_ext_prepare(&tmpl);
4306
0e9091d6
PNA		 4307 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4308 if (err < 0)
4309 return err;
4310 if (flags != 0)
4311 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 4312
4313 if (set->flags & NFT_SET_MAP) {
4314 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 4315 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341 4316 return -EINVAL;
bd7fc645 4317 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
fe2811eb 4318 flags & NFT_SET_ELEM_INTERVAL_END)
bd7fc645 4319 return -EINVAL;
20a69341
PM		 4320 } else {
4321 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4322 return -EINVAL;
4323 }
4324
c3e1b005
PM		 4325 timeout = 0;
4326 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4327 if (!(set->flags & NFT_SET_TIMEOUT))
4328 return -EINVAL;
8e1102d5
FW		 4329 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4330 &timeout);
4331 if (err)
4332 return err;
c3e1b005
PM		 4333 } else if (set->flags & NFT_SET_TIMEOUT) {
4334 timeout = set->timeout;
4335 }
4336
7d740264 4337 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
d0a11fc3 4338 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4339 if (err < 0)
4340 goto err1;
4341 err = -EINVAL;
4342 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
4343 goto err2;
4344
7d740264 4345 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
c3e1b005
PM		 4346 if (timeout > 0) {
4347 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4348 if (timeout != set->timeout)
4349 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4350 }
fe2811eb 4351
8aeff920
PNA		 4352 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4353 if (!(set->flags & NFT_SET_OBJECT)) {
4354 err = -EINVAL;
4355 goto err2;
4356 }
cac20fcd
PNA		 4357 obj = nft_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
4358 set->objtype, genmask);
8aeff920
PNA		 4359 if (IS_ERR(obj)) {
4360 err = PTR_ERR(obj);
4361 goto err2;
4362 }
4363 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4364 }
4365
20a69341 4366 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
d0a11fc3
PM		 4367 err = nft_data_init(ctx, &data, sizeof(data), &d2,
4368 nla[NFTA_SET_ELEM_DATA]);
20a69341
PM		 4369 if (err < 0)
4370 goto err2;
4371
4372 err = -EINVAL;
4373 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
4374 goto err3;
4375
4376 dreg = nft_type_to_reg(set->dtype);
4377 list_for_each_entry(binding, &set->bindings, list) {
4378 struct nft_ctx bind_ctx = {
58c78e10 4379 .net = ctx->net,
36596dad 4380 .family = ctx->family,
20a69341 4381 .table = ctx->table,
7c95f6d8 4382 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 4383 };
4384
11113e19
PM		 4385 if (!(binding->flags & NFT_SET_MAP))
4386 continue;
4387
1ec10212
PM		 4388 err = nft_validate_register_store(&bind_ctx, dreg,
4389 &data,
4390 d2.type, d2.len);
20a69341
PM		 4391 if (err < 0)
4392 goto err3;
a654de8f
PNA		 4393
4394 if (d2.type == NFT_DATA_VERDICT &&
4395 (data.verdict.code == NFT_GOTO ||
4396 data.verdict.code == NFT_JUMP))
4397 nft_validate_state_update(ctx->net,
4398 NFT_VALIDATE_NEED);
20a69341 4399 }
fe2811eb 4400
7d740264 4401 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
20a69341
PM		 4402 }
4403
68e942e8
PM		 4404 /* The full maximum length of userdata can exceed the maximum
4405 * offset value (U8_MAX) for following extensions, therefor it
4406 * must be the last extension added.
4407 */
4408 ulen = 0;
4409 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4410 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4411 if (ulen > 0)
4412 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4413 ulen);
4414 }
4415
fe2811eb 4416 err = -ENOMEM;
7d740264 4417 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
c3e1b005 4418 timeout, GFP_KERNEL);
fe2811eb
PM		 4419 if (elem.priv == NULL)
4420 goto err3;
4421
4422 ext = nft_set_elem_ext(set, elem.priv);
4423 if (flags)
4424 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 4425 if (ulen > 0) {
4426 udata = nft_set_ext_userdata(ext);
4427 udata->len = ulen - 1;
4428 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4429 }
8aeff920
PNA		 4430 if (obj) {
4431 *nft_set_ext_obj(ext) = obj;
4432 obj->use++;
4433 }
fe2811eb 4434
60319eb1
PNA		 4435 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4436 if (trans == NULL)
fe2811eb 4437 goto err4;
60319eb1 4438
69086658 4439 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 4440 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4441 if (err) {
4442 if (err == -EEXIST) {
9744a6fc
PNA		 4443 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4444 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4445 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
f0dfd7a2
CIK		 4446 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
4447 err = -EBUSY;
4448 goto err5;
4449 }
8aeff920
PNA		 4450 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4451 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4452 memcmp(nft_set_ext_data(ext),
4453 nft_set_ext_data(ext2), set->dlen) != 0) ||
4454 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4455 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4456 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 4457 err = -EBUSY;
4458 else if (!(nlmsg_flags & NLM_F_EXCL))
4459 err = 0;
4460 }
fe2811eb 4461 goto err5;
c016c7e4 4462 }
20a69341 4463
35d0ac90
PNA		 4464 if (set->size &&
4465 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4466 err = -ENFILE;
4467 goto err6;
4468 }
4469
60319eb1 4470 nft_trans_elem(trans) = elem;
46bbafce 4471 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 4472 return 0;
4473
35d0ac90 4474err6:
5cb82a38 4475 set->ops->remove(ctx->net, set, &elem);
fe2811eb 4476err5:
60319eb1 4477 kfree(trans);
fe2811eb
PM		 4478err4:
4479 kfree(elem.priv);
20a69341
PM		 4480err3:
4481 if (nla[NFTA_SET_ELEM_DATA] != NULL)
59105446 4482 nft_data_release(&data, d2.type);
20a69341 4483err2:
59105446 4484 nft_data_release(&elem.key.val, d1.type);
20a69341
PM		 4485err1:
4486 return err;
4487}
4488
633c9a84
PNA		 4489static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4490 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4491 const struct nlattr * const nla[],
4492 struct netlink_ext_ack *extack)
20a69341 4493{
f2a6d766 4494 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4495 const struct nlattr *attr;
4496 struct nft_set *set;
4497 struct nft_ctx ctx;
a654de8f 4498 int rem, err;
20a69341 4499
7d5570ca
PNA		 4500 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4501 return -EINVAL;
4502
36dd1bcc
PNA		 4503 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4504 genmask);
20a69341
PM		 4505 if (err < 0)
4506 return err;
4507
a3073c17
PNA		 4508 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4509 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
4510 if (IS_ERR(set))
4511 return PTR_ERR(set);
958bee14 4512
20a69341
PM		 4513 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4514 return -EBUSY;
4515
4516 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 4517 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 4518 if (err < 0)
a654de8f 4519 return err;
20a69341 4520 }
a654de8f
PNA		 4521
4522 if (net->nft.validate_state == NFT_VALIDATE_DO)
4523 return nft_table_validate(net, ctx.table);
4524
4525 return 0;
20a69341
PM		 4526}
4527
59105446
PNA		 4528/**
4529 * nft_data_hold - hold a nft_data item
4530 *
4531 * @data: struct nft_data to release
4532 * @type: type of data
4533 *
4534 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4535 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4536 * NFT_GOTO verdicts. This function must be called on active data objects
4537 * from the second phase of the commit protocol.
4538 */
bb7b40ae 4539void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446
PNA		 4540{
4541 if (type == NFT_DATA_VERDICT) {
4542 switch (data->verdict.code) {
4543 case NFT_JUMP:
4544 case NFT_GOTO:
4545 data->verdict.chain->use++;
4546 break;
4547 }
4548 }
4549}
4550
4551static void nft_set_elem_activate(const struct net *net,
4552 const struct nft_set *set,
4553 struct nft_set_elem *elem)
4554{
4555 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4556
4557 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4558 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4559 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4560 (*nft_set_ext_obj(ext))->use++;
4561}
4562
4563static void nft_set_elem_deactivate(const struct net *net,
4564 const struct nft_set *set,
4565 struct nft_set_elem *elem)
4566{
4567 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4568
4569 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4570 nft_data_release(nft_set_ext_data(ext), set->dtype);
4571 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4572 (*nft_set_ext_obj(ext))->use--;
4573}
4574
60319eb1 4575static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 4576 const struct nlattr *attr)
4577{
4578 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 4579 struct nft_set_ext_tmpl tmpl;
20a69341
PM		 4580 struct nft_data_desc desc;
4581 struct nft_set_elem elem;
3971ca14 4582 struct nft_set_ext *ext;
60319eb1 4583 struct nft_trans *trans;
3971ca14
PNA		 4584 u32 flags = 0;
4585 void *priv;
20a69341
PM		 4586 int err;
4587
4588 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
fceb6435 4589 nft_set_elem_policy, NULL);
20a69341
PM		 4590 if (err < 0)
4591 goto err1;
4592
4593 err = -EINVAL;
4594 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4595 goto err1;
4596
3971ca14
PNA		 4597 nft_set_ext_prepare(&tmpl);
4598
4599 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4600 if (err < 0)
4601 return err;
4602 if (flags != 0)
4603 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4604
7d740264 4605 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
d0a11fc3 4606 nla[NFTA_SET_ELEM_KEY]);
20a69341
PM		 4607 if (err < 0)
4608 goto err1;
4609
4610 err = -EINVAL;
4611 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4612 goto err2;
4613
3971ca14
PNA		 4614 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4615
4616 err = -ENOMEM;
4617 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4618 GFP_KERNEL);
4619 if (elem.priv == NULL)
4620 goto err2;
4621
4622 ext = nft_set_elem_ext(set, elem.priv);
4623 if (flags)
4624 *nft_set_ext_flags(ext) = flags;
4625
60319eb1 4626 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
609ccf08
JL		 4627 if (trans == NULL) {
4628 err = -ENOMEM;
3971ca14 4629 goto err3;
609ccf08 4630 }
20a69341 4631
42a55769 4632 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 4633 if (priv == NULL) {
cc02e457 4634 err = -ENOENT;
3971ca14 4635 goto err4;
cc02e457 4636 }
3971ca14
PNA		 4637 kfree(elem.priv);
4638 elem.priv = priv;
cc02e457 4639
59105446
PNA		 4640 nft_set_elem_deactivate(ctx->net, set, &elem);
4641
60319eb1 4642 nft_trans_elem(trans) = elem;
46bbafce 4643 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 4644 return 0;
cc02e457 4645
3971ca14 4646err4:
cc02e457 4647 kfree(trans);
3971ca14
PNA		 4648err3:
4649 kfree(elem.priv);
20a69341 4650err2:
59105446 4651 nft_data_release(&elem.key.val, desc.type);
20a69341
PM		 4652err1:
4653 return err;
4654}
4655
8411b644 4656static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 4657 struct nft_set *set,
8411b644 4658 const struct nft_set_iter *iter,
de70185d 4659 struct nft_set_elem *elem)
8411b644
PNA		 4660{
4661 struct nft_trans *trans;
4662 int err;
4663
4664 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4665 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4666 if (!trans)
4667 return -ENOMEM;
4668
1ba1c414 4669 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 4670 err = -ENOENT;
4671 goto err1;
4672 }
b2c11e4b 4673 set->ndeact++;
8411b644 4674
7acfda53 4675 nft_set_elem_deactivate(ctx->net, set, elem);
de70185d
PNA		 4676 nft_trans_elem_set(trans) = set;
4677 nft_trans_elem(trans) = *elem;
8411b644
PNA		 4678 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4679
4680 return 0;
4681err1:
4682 kfree(trans);
4683 return err;
4684}
4685
633c9a84
PNA		 4686static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4687 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4688 const struct nlattr * const nla[],
4689 struct netlink_ext_ack *extack)
20a69341 4690{
f2a6d766 4691 u8 genmask = nft_genmask_next(net);
20a69341
PM		 4692 const struct nlattr *attr;
4693 struct nft_set *set;
4694 struct nft_ctx ctx;
60319eb1 4695 int rem, err = 0;
20a69341 4696
36dd1bcc
PNA		 4697 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4698 genmask);
20a69341
PM		 4699 if (err < 0)
4700 return err;
4701
cac20fcd 4702 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 4703 if (IS_ERR(set))
4704 return PTR_ERR(set);
4705 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4706 return -EBUSY;
4707
8411b644 4708 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 4709 struct nft_set_iter iter = {
4710 .genmask = genmask,
4711 .fn = nft_flush_set,
8411b644 4712 };
baa2d42c 4713 set->ops->walk(&ctx, set, &iter);
8411b644 4714
baa2d42c 4715 return iter.err;
8411b644
PNA		 4716 }
4717
20a69341
PM		 4718 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4719 err = nft_del_setelem(&ctx, set, attr);
4720 if (err < 0)
60319eb1 4721 break;
4fefee57 4722
3dd0673a 4723 set->ndeact++;
20a69341 4724 }
60319eb1 4725 return err;
20a69341
PM		 4726}
4727
cfed7e1b
PM		 4728void nft_set_gc_batch_release(struct rcu_head *rcu)
4729{
4730 struct nft_set_gc_batch *gcb;
4731 unsigned int i;
4732
4733 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4734 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 4735 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 4736 kfree(gcb);
4737}
4738EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4739
4740struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4741 gfp_t gfp)
4742{
4743 struct nft_set_gc_batch *gcb;
4744
4745 gcb = kzalloc(sizeof(*gcb), gfp);
4746 if (gcb == NULL)
4747 return gcb;
4748 gcb->head.set = set;
4749 return gcb;
4750}
4751EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4752
e5009240
PNA		 4753/*
4754 * Stateful objects
4755 */
4756
4757/**
4758 * nft_register_obj- register nf_tables stateful object type
4759 * @obj: object type
4760 *
4761 * Registers the object type for use with nf_tables. Returns zero on
4762 * success or a negative errno code otherwise.
4763 */
4764int nft_register_obj(struct nft_object_type *obj_type)
4765{
4766 if (obj_type->type == NFT_OBJECT_UNSPEC)
4767 return -EINVAL;
4768
4769 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4770 list_add_rcu(&obj_type->list, &nf_tables_objects);
4771 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4772 return 0;
4773}
4774EXPORT_SYMBOL_GPL(nft_register_obj);
4775
4776/**
4777 * nft_unregister_obj - unregister nf_tables object type
4778 * @obj: object type
4779 *
4780 * Unregisters the object type for use with nf_tables.
4781 */
4782void nft_unregister_obj(struct nft_object_type *obj_type)
4783{
4784 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4785 list_del_rcu(&obj_type->list);
4786 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4787}
4788EXPORT_SYMBOL_GPL(nft_unregister_obj);
4789
cac20fcd
PNA		 4790struct nft_object *nft_obj_lookup(const struct nft_table *table,
4791 const struct nlattr *nla, u32 objtype,
4792 u8 genmask)
e5009240
PNA		 4793{
4794 struct nft_object *obj;
4795
d9adf22a 4796 list_for_each_entry_rcu(obj, &table->objects, list) {
e5009240 4797 if (!nla_strcmp(nla, obj->name) &&
dfc46034 4798 objtype == obj->ops->type->type &&
e5009240
PNA		 4799 nft_active_genmask(obj, genmask))
4800 return obj;
4801 }
4802 return ERR_PTR(-ENOENT);
4803}
cac20fcd 4804EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 4805
cac20fcd
PNA		 4806static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
4807 const struct nlattr *nla,
4808 u32 objtype, u8 genmask)
3ecbfd65
HS		 4809{
4810 struct nft_object *obj;
4811
4812 list_for_each_entry(obj, &table->objects, list) {
4813 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
4814 objtype == obj->ops->type->type &&
4815 nft_active_genmask(obj, genmask))
4816 return obj;
4817 }
4818 return ERR_PTR(-ENOENT);
4819}
4820
e5009240 4821static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 4822 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4823 .len = NFT_TABLE_MAXNAMELEN - 1 },
4824 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4825 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 4826 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4827 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 4828 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
e5009240
PNA		 4829};
4830
84fba055
FW		 4831static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4832 const struct nft_object_type *type,
e5009240
PNA		 4833 const struct nlattr *attr)
4834{
5b4c6e38 4835 struct nlattr **tb;
dfc46034 4836 const struct nft_object_ops *ops;
e5009240 4837 struct nft_object *obj;
5b4c6e38
GS		 4838 int err = -ENOMEM;
4839
4840 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
4841 if (!tb)
4842 goto err1;
e5009240
PNA		 4843
4844 if (attr) {
fceb6435
JB		 4845 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4846 NULL);
e5009240 4847 if (err < 0)
5b4c6e38 4848 goto err2;
e5009240
PNA		 4849 } else {
4850 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4851 }
4852
dfc46034
PBG		 4853 if (type->select_ops) {
4854 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4855 if (IS_ERR(ops)) {
4856 err = PTR_ERR(ops);
5b4c6e38 4857 goto err2;
dfc46034
PBG		 4858 }
4859 } else {
4860 ops = type->ops;
4861 }
4862
e5009240 4863 err = -ENOMEM;
dfc46034 4864 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5b4c6e38
GS		 4865 if (!obj)
4866 goto err2;
e5009240 4867
dfc46034 4868 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 4869 if (err < 0)
5b4c6e38 4870 goto err3;
e5009240 4871
dfc46034
PBG		 4872 obj->ops = ops;
4873
5b4c6e38 4874 kfree(tb);
e5009240 4875 return obj;
5b4c6e38 4876err3:
e5009240 4877 kfree(obj);
5b4c6e38
GS		 4878err2:
4879 kfree(tb);
e5009240
PNA		 4880err1:
4881 return ERR_PTR(err);
4882}
4883
4884static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 4885 struct nft_object *obj, bool reset)
e5009240
PNA		 4886{
4887 struct nlattr *nest;
4888
4889 nest = nla_nest_start(skb, attr);
4890 if (!nest)
4891 goto nla_put_failure;
dfc46034 4892 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 4893 goto nla_put_failure;
4894 nla_nest_end(skb, nest);
4895 return 0;
4896
4897nla_put_failure:
4898 return -1;
4899}
4900
4901static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4902{
4903 const struct nft_object_type *type;
4904
4905 list_for_each_entry(type, &nf_tables_objects, list) {
4906 if (objtype == type->type)
4907 return type;
4908 }
4909 return NULL;
4910}
4911
452238e8
FW		 4912static const struct nft_object_type *
4913nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 4914{
4915 const struct nft_object_type *type;
4916
4917 type = __nft_obj_type_get(objtype);
4918 if (type != NULL && try_module_get(type->owner))
4919 return type;
4920
f102d66b 4921 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 4922#ifdef CONFIG_MODULES
4923 if (type == NULL) {
452238e8 4924 nft_request_module(net, "nft-obj-%u", objtype);
e5009240
PNA		 4925 if (__nft_obj_type_get(objtype))
4926 return ERR_PTR(-EAGAIN);
4927 }
4928#endif
4929 return ERR_PTR(-ENOENT);
4930}
4931
4932static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4933 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4934 const struct nlattr * const nla[],
4935 struct netlink_ext_ack *extack)
e5009240
PNA		 4936{
4937 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4938 const struct nft_object_type *type;
4939 u8 genmask = nft_genmask_next(net);
4940 int family = nfmsg->nfgen_family;
e5009240
PNA		 4941 struct nft_table *table;
4942 struct nft_object *obj;
4943 struct nft_ctx ctx;
4944 u32 objtype;
4945 int err;
4946
4947 if (!nla[NFTA_OBJ_TYPE] ||
4948 !nla[NFTA_OBJ_NAME] ||
4949 !nla[NFTA_OBJ_DATA])
4950 return -EINVAL;
4951
cac20fcd 4952 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 4953 if (IS_ERR(table)) {
4954 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 4955 return PTR_ERR(table);
36dd1bcc 4956 }
e5009240
PNA		 4957
4958 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
cac20fcd 4959 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 4960 if (IS_ERR(obj)) {
4961 err = PTR_ERR(obj);
36dd1bcc
PNA		 4962 if (err != -ENOENT) {
4963 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 4964 return err;
36dd1bcc 4965 }
1a28ad74 4966 } else {
36dd1bcc
PNA		 4967 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4968 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 4969 return -EEXIST;
36dd1bcc 4970 }
e5009240
PNA		 4971 return 0;
4972 }
4973
98319cb9 4974 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240 4975
452238e8 4976 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 4977 if (IS_ERR(type))
4978 return PTR_ERR(type);
4979
84fba055 4980 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 4981 if (IS_ERR(obj)) {
4982 err = PTR_ERR(obj);
4983 goto err1;
4984 }
18965317 4985 obj->table = table;
3ecbfd65
HS		 4986 obj->handle = nf_tables_alloc_handle(table);
4987
61509575
PS		 4988 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4989 if (!obj->name) {
4990 err = -ENOMEM;
4991 goto err2;
4992 }
e5009240
PNA		 4993
4994 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4995 if (err < 0)
61509575 4996 goto err3;
e5009240
PNA		 4997
4998 list_add_tail_rcu(&obj->list, &table->objects);
4999 table->use++;
5000 return 0;
61509575
PS		 5001err3:
5002 kfree(obj->name);
e5009240 5003err2:
dfc46034 5004 if (obj->ops->destroy)
00bfb320 5005 obj->ops->destroy(&ctx, obj);
e5009240
PNA		 5006 kfree(obj);
5007err1:
5008 module_put(type->owner);
5009 return err;
5010}
5011
5012static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5013 u32 portid, u32 seq, int event, u32 flags,
5014 int family, const struct nft_table *table,
43da04a5 5015 struct nft_object *obj, bool reset)
e5009240
PNA		 5016{
5017 struct nfgenmsg *nfmsg;
5018 struct nlmsghdr *nlh;
5019
dedb67c4 5020 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 5021 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5022 if (nlh == NULL)
5023 goto nla_put_failure;
5024
5025 nfmsg = nlmsg_data(nlh);
5026 nfmsg->nfgen_family = family;
5027 nfmsg->version = NFNETLINK_V0;
5028 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5029
5030 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5031 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
dfc46034 5032 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 5033 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 5034 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5035 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5036 NFTA_OBJ_PAD))
e5009240
PNA		 5037 goto nla_put_failure;
5038
5039 nlmsg_end(skb, nlh);
5040 return 0;
5041
5042nla_put_failure:
5043 nlmsg_trim(skb, nlh);
5044 return -1;
5045}
5046
a9fea2a3 5047struct nft_obj_filter {
e46abbcc 5048 char *table;
a9fea2a3
PNA		 5049 u32 type;
5050};
5051
e5009240
PNA		 5052static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5053{
5054 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 5055 const struct nft_table *table;
e5009240 5056 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 5057 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 5058 struct net *net = sock_net(skb->sk);
5059 int family = nfmsg->nfgen_family;
43da04a5
PNA		 5060 struct nft_object *obj;
5061 bool reset = false;
5062
5063 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5064 reset = true;
e5009240
PNA		 5065
5066 rcu_read_lock();
5067 cb->seq = net->nft.base_seq;
5068
36596dad 5069 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 5070 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 5071 continue;
5072
36596dad
PNA		 5073 list_for_each_entry_rcu(obj, &table->objects, list) {
5074 if (!nft_is_active(net, obj))
5075 goto cont;
5076 if (idx < s_idx)
5077 goto cont;
5078 if (idx > s_idx)
5079 memset(&cb->args[1], 0,
5080 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 5081 if (filter && filter->table &&
36596dad
PNA		 5082 strcmp(filter->table, table->name))
5083 goto cont;
5084 if (filter &&
5085 filter->type != NFT_OBJECT_UNSPEC &&
5086 obj->ops->type->type != filter->type)
5087 goto cont;
a9fea2a3 5088
36596dad
PNA		 5089 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5090 cb->nlh->nlmsg_seq,
5091 NFT_MSG_NEWOBJ,
5092 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 5093 table->family, table,
36596dad
PNA		 5094 obj, reset) < 0)
5095 goto done;
e5009240 5096
36596dad 5097 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 5098cont:
36596dad 5099 idx++;
e5009240
PNA		 5100 }
5101 }
5102done:
5103 rcu_read_unlock();
5104
5105 cb->args[0] = idx;
5106 return skb->len;
5107}
5108
90fd131a 5109static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 5110{
90fd131a
FW		 5111 const struct nlattr * const *nla = cb->data;
5112 struct nft_obj_filter *filter = NULL;
e46abbcc 5113
90fd131a
FW		 5114 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5115 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5116 if (!filter)
5117 return -ENOMEM;
5118
5119 if (nla[NFTA_OBJ_TABLE]) {
5120 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5121 if (!filter->table) {
5122 kfree(filter);
5123 return -ENOMEM;
5124 }
5125 }
5126
5127 if (nla[NFTA_OBJ_TYPE])
5128 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 5129 }
a9fea2a3 5130
90fd131a 5131 cb->data = filter;
a9fea2a3
PNA		 5132 return 0;
5133}
5134
90fd131a 5135static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 5136{
90fd131a 5137 struct nft_obj_filter *filter = cb->data;
a9fea2a3 5138
90fd131a
FW		 5139 if (filter) {
5140 kfree(filter->table);
5141 kfree(filter);
e46abbcc 5142 }
a9fea2a3 5143
90fd131a 5144 return 0;
a9fea2a3
PNA		 5145}
5146
d9adf22a 5147/* called with rcu_read_lock held */
e5009240
PNA		 5148static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5149 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5150 const struct nlattr * const nla[],
5151 struct netlink_ext_ack *extack)
e5009240
PNA		 5152{
5153 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5154 u8 genmask = nft_genmask_cur(net);
5155 int family = nfmsg->nfgen_family;
e5009240
PNA		 5156 const struct nft_table *table;
5157 struct nft_object *obj;
5158 struct sk_buff *skb2;
43da04a5 5159 bool reset = false;
e5009240
PNA		 5160 u32 objtype;
5161 int err;
5162
5163 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5164 struct netlink_dump_control c = {
90fd131a 5165 .start = nf_tables_dump_obj_start,
e5009240 5166 .dump = nf_tables_dump_obj,
a9fea2a3 5167 .done = nf_tables_dump_obj_done,
d9adf22a 5168 .module = THIS_MODULE,
90fd131a 5169 .data = (void *)nla,
e5009240 5170 };
a9fea2a3 5171
d9adf22a 5172 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
e5009240
PNA		 5173 }
5174
5175 if (!nla[NFTA_OBJ_NAME] ||
5176 !nla[NFTA_OBJ_TYPE])
5177 return -EINVAL;
5178
cac20fcd 5179 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5180 if (IS_ERR(table)) {
5181 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5182 return PTR_ERR(table);
36dd1bcc 5183 }
e5009240
PNA		 5184
5185 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
cac20fcd 5186 obj = nft_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 5187 if (IS_ERR(obj)) {
5188 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5189 return PTR_ERR(obj);
36dd1bcc 5190 }
e5009240 5191
d9adf22a 5192 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 5193 if (!skb2)
5194 return -ENOMEM;
5195
43da04a5
PNA		 5196 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5197 reset = true;
5198
e5009240
PNA		 5199 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5200 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 5201 family, table, obj, reset);
e5009240
PNA		 5202 if (err < 0)
5203 goto err;
5204
5205 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5206err:
5207 kfree_skb(skb2);
5208 return err;
e5009240
PNA		 5209}
5210
00bfb320 5211static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 5212{
dfc46034 5213 if (obj->ops->destroy)
00bfb320 5214 obj->ops->destroy(ctx, obj);
e5009240 5215
dfc46034 5216 module_put(obj->ops->type->owner);
61509575 5217 kfree(obj->name);
e5009240
PNA		 5218 kfree(obj);
5219}
5220
5221static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 5222 struct sk_buff *skb, const struct nlmsghdr *nlh,
5223 const struct nlattr * const nla[],
5224 struct netlink_ext_ack *extack)
e5009240
PNA		 5225{
5226 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5227 u8 genmask = nft_genmask_next(net);
5228 int family = nfmsg->nfgen_family;
36dd1bcc 5229 const struct nlattr *attr;
e5009240
PNA		 5230 struct nft_table *table;
5231 struct nft_object *obj;
5232 struct nft_ctx ctx;
5233 u32 objtype;
5234
5235 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 5236 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 5237 return -EINVAL;
5238
cac20fcd 5239 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5240 if (IS_ERR(table)) {
5241 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5242 return PTR_ERR(table);
36dd1bcc 5243 }
e5009240
PNA		 5244
5245 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 5246 if (nla[NFTA_OBJ_HANDLE]) {
5247 attr = nla[NFTA_OBJ_HANDLE];
5248 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5249 } else {
5250 attr = nla[NFTA_OBJ_NAME];
5251 obj = nft_obj_lookup(table, attr, objtype, genmask);
5252 }
5253
5254 if (IS_ERR(obj)) {
5255 NL_SET_BAD_ATTR(extack, attr);
e5009240 5256 return PTR_ERR(obj);
36dd1bcc
PNA		 5257 }
5258 if (obj->use > 0) {
5259 NL_SET_BAD_ATTR(extack, attr);
e5009240 5260 return -EBUSY;
36dd1bcc 5261 }
e5009240 5262
98319cb9 5263 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240
PNA		 5264
5265 return nft_delobj(&ctx, obj);
5266}
5267
25e94a99
PNA		 5268void nft_obj_notify(struct net *net, struct nft_table *table,
5269 struct nft_object *obj, u32 portid, u32 seq, int event,
5270 int family, int report, gfp_t gfp)
e5009240
PNA		 5271{
5272 struct sk_buff *skb;
5273 int err;
5274
2599e989
PNA		 5275 if (!report &&
5276 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5277 return;
e5009240 5278
2599e989 5279 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 5280 if (skb == NULL)
5281 goto err;
5282
2599e989
PNA		 5283 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5284 table, obj, false);
e5009240
PNA		 5285 if (err < 0) {
5286 kfree_skb(skb);
5287 goto err;
5288 }
5289
25e94a99
PNA		 5290 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5291 return;
e5009240 5292err:
25e94a99 5293 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 5294}
2599e989
PNA		 5295EXPORT_SYMBOL_GPL(nft_obj_notify);
5296
25e94a99
PNA		 5297static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5298 struct nft_object *obj, int event)
2599e989 5299{
25e94a99 5300 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
36596dad 5301 ctx->family, ctx->report, GFP_KERNEL);
2599e989 5302}
e5009240 5303
3b49e2e9
PNA		 5304/*
5305 * Flow tables
5306 */
5307void nft_register_flowtable_type(struct nf_flowtable_type *type)
5308{
5309 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5310 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
5311 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5312}
5313EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
5314
5315void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
5316{
5317 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5318 list_del_rcu(&type->list);
5319 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5320}
5321EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
5322
5323static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
5324 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
5325 .len = NFT_NAME_MAXLEN - 1 },
5326 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
5327 .len = NFT_NAME_MAXLEN - 1 },
5328 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 5329 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
3b49e2e9
PNA		 5330};
5331
cac20fcd
PNA		 5332struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
5333 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 5334{
5335 struct nft_flowtable *flowtable;
5336
d9adf22a 5337 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 5338 if (!nla_strcmp(nla, flowtable->name) &&
5339 nft_active_genmask(flowtable, genmask))
5340 return flowtable;
5341 }
5342 return ERR_PTR(-ENOENT);
5343}
cac20fcd 5344EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 5345
ae0662f8 5346static struct nft_flowtable *
cac20fcd
PNA		 5347nft_flowtable_lookup_byhandle(const struct nft_table *table,
5348 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 5349{
5350 struct nft_flowtable *flowtable;
5351
5352 list_for_each_entry(flowtable, &table->flowtables, list) {
5353 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
5354 nft_active_genmask(flowtable, genmask))
5355 return flowtable;
5356 }
5357 return ERR_PTR(-ENOENT);
5358}
5359
3b49e2e9
PNA		 5360static int nf_tables_parse_devices(const struct nft_ctx *ctx,
5361 const struct nlattr *attr,
5362 struct net_device *dev_array[], int *len)
5363{
5364 const struct nlattr *tmp;
5365 struct net_device *dev;
5366 char ifname[IFNAMSIZ];
5367 int rem, n = 0, err;
5368
5369 nla_for_each_nested(tmp, attr, rem) {
5370 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
5371 err = -EINVAL;
5372 goto err1;
5373 }
5374
5375 nla_strlcpy(ifname, tmp, IFNAMSIZ);
90d2723c 5376 dev = __dev_get_by_name(ctx->net, ifname);
3b49e2e9
PNA		 5377 if (!dev) {
5378 err = -ENOENT;
5379 goto err1;
5380 }
5381
5382 dev_array[n++] = dev;
5383 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
5384 err = -EFBIG;
5385 goto err1;
5386 }
5387 }
5388 if (!len)
5389 return -EINVAL;
5390
5391 err = 0;
5392err1:
5393 *len = n;
5394 return err;
5395}
5396
5397static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
5398 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
5399 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
5400 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
5401};
5402
5403static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
5404 const struct nlattr *attr,
5405 struct nft_flowtable *flowtable)
5406{
5407 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
5408 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
5409 struct nf_hook_ops *ops;
5410 int hooknum, priority;
5411 int err, n = 0, i;
5412
5413 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
5414 nft_flowtable_hook_policy, NULL);
5415 if (err < 0)
5416 return err;
5417
5418 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
5419 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
5420 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
5421 return -EINVAL;
5422
5423 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
fe19c04c 5424 if (hooknum != NF_NETDEV_INGRESS)
3b49e2e9
PNA		 5425 return -EINVAL;
5426
5427 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
5428
5429 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5430 dev_array, &n);
5431 if (err < 0)
d92191aa 5432 return err;
3b49e2e9 5433
6396bb22 5434 ops = kcalloc(n, sizeof(struct nf_hook_ops), GFP_KERNEL);
90d2723c
PNA		 5435 if (!ops)
5436 return -ENOMEM;
3b49e2e9 5437
0e839dfa
PNA		 5438 flowtable->hooknum = hooknum;
5439 flowtable->priority = priority;
3b49e2e9
PNA		 5440 flowtable->ops = ops;
5441 flowtable->ops_len = n;
5442
5443 for (i = 0; i < n; i++) {
5444 flowtable->ops[i].pf = NFPROTO_NETDEV;
5445 flowtable->ops[i].hooknum = hooknum;
5446 flowtable->ops[i].priority = priority;
17857d92 5447 flowtable->ops[i].priv = &flowtable->data;
3b49e2e9
PNA		 5448 flowtable->ops[i].hook = flowtable->data.type->hook;
5449 flowtable->ops[i].dev = dev_array[i];
5450 }
5451
3b49e2e9
PNA		 5452 return err;
5453}
5454
98319cb9 5455static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 5456{
5457 const struct nf_flowtable_type *type;
5458
5459 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 5460 if (family == type->family)
3b49e2e9
PNA		 5461 return type;
5462 }
5463 return NULL;
5464}
5465
452238e8
FW		 5466static const struct nf_flowtable_type *
5467nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 5468{
5469 const struct nf_flowtable_type *type;
5470
98319cb9 5471 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 5472 if (type != NULL && try_module_get(type->owner))
5473 return type;
5474
f102d66b 5475 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 5476#ifdef CONFIG_MODULES
5477 if (type == NULL) {
452238e8 5478 nft_request_module(net, "nf-flowtable-%u", family);
98319cb9 5479 if (__nft_flowtable_type_get(family))
3b49e2e9
PNA		 5480 return ERR_PTR(-EAGAIN);
5481 }
5482#endif
5483 return ERR_PTR(-ENOENT);
5484}
5485
3b49e2e9
PNA		 5486static void nft_unregister_flowtable_net_hooks(struct net *net,
5487 struct nft_flowtable *flowtable)
5488{
5489 int i;
5490
5491 for (i = 0; i < flowtable->ops_len; i++) {
5492 if (!flowtable->ops[i].dev)
5493 continue;
5494
5495 nf_unregister_net_hook(net, &flowtable->ops[i]);
5496 }
5497}
5498
5499static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5500 struct sk_buff *skb,
5501 const struct nlmsghdr *nlh,
5502 const struct nlattr * const nla[],
5503 struct netlink_ext_ack *extack)
5504{
5505 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5506 const struct nf_flowtable_type *type;
32fc7187 5507 struct nft_flowtable *flowtable, *ft;
3b49e2e9
PNA		 5508 u8 genmask = nft_genmask_next(net);
5509 int family = nfmsg->nfgen_family;
3b49e2e9
PNA		 5510 struct nft_table *table;
5511 struct nft_ctx ctx;
5512 int err, i, k;
5513
5514 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5515 !nla[NFTA_FLOWTABLE_NAME] ||
5516 !nla[NFTA_FLOWTABLE_HOOK])
5517 return -EINVAL;
5518
cac20fcd
PNA		 5519 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5520 genmask);
36dd1bcc
PNA		 5521 if (IS_ERR(table)) {
5522 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 5523 return PTR_ERR(table);
36dd1bcc 5524 }
3b49e2e9 5525
cac20fcd
PNA		 5526 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5527 genmask);
3b49e2e9
PNA		 5528 if (IS_ERR(flowtable)) {
5529 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 5530 if (err != -ENOENT) {
5531 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 5532 return err;
36dd1bcc 5533 }
3b49e2e9 5534 } else {
36dd1bcc
PNA		 5535 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5536 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 5537 return -EEXIST;
36dd1bcc 5538 }
3b49e2e9
PNA		 5539
5540 return 0;
5541 }
5542
98319cb9 5543 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 5544
5545 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5546 if (!flowtable)
5547 return -ENOMEM;
5548
5549 flowtable->table = table;
3ecbfd65
HS		 5550 flowtable->handle = nf_tables_alloc_handle(table);
5551
3b49e2e9
PNA		 5552 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5553 if (!flowtable->name) {
5554 err = -ENOMEM;
5555 goto err1;
5556 }
5557
452238e8 5558 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 5559 if (IS_ERR(type)) {
5560 err = PTR_ERR(type);
5561 goto err2;
5562 }
5563
5564 flowtable->data.type = type;
a268de77 5565 err = type->init(&flowtable->data);
3b49e2e9
PNA		 5566 if (err < 0)
5567 goto err3;
5568
5569 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5570 flowtable);
5571 if (err < 0)
a268de77 5572 goto err4;
3b49e2e9
PNA		 5573
5574 for (i = 0; i < flowtable->ops_len; i++) {
32fc7187
PNA		 5575 if (!flowtable->ops[i].dev)
5576 continue;
5577
5578 list_for_each_entry(ft, &table->flowtables, list) {
5579 for (k = 0; k < ft->ops_len; k++) {
5580 if (!ft->ops[k].dev)
5581 continue;
5582
5583 if (flowtable->ops[i].dev == ft->ops[k].dev &&
5584 flowtable->ops[i].pf == ft->ops[k].pf) {
5585 err = -EBUSY;
a268de77 5586 goto err5;
32fc7187
PNA		 5587 }
5588 }
5589 }
5590
3b49e2e9
PNA		 5591 err = nf_register_net_hook(net, &flowtable->ops[i]);
5592 if (err < 0)
a268de77 5593 goto err5;
3b49e2e9
PNA		 5594 }
5595
5596 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5597 if (err < 0)
a268de77 5598 goto err6;
3b49e2e9
PNA		 5599
5600 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5601 table->use++;
5602
5603 return 0;
a268de77 5604err6:
3b49e2e9 5605 i = flowtable->ops_len;
a268de77 5606err5:
b8088dda 5607 for (k = i - 1; k >= 0; k--)
0e0d5002 5608 nf_unregister_net_hook(net, &flowtable->ops[k]);
3b49e2e9
PNA		 5609
5610 kfree(flowtable->ops);
a268de77
FF		 5611err4:
5612 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 5613err3:
5614 module_put(type->owner);
5615err2:
5616 kfree(flowtable->name);
5617err1:
5618 kfree(flowtable);
5619 return err;
5620}
5621
5622static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5623 struct sk_buff *skb,
5624 const struct nlmsghdr *nlh,
5625 const struct nlattr * const nla[],
5626 struct netlink_ext_ack *extack)
5627{
5628 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5629 u8 genmask = nft_genmask_next(net);
5630 int family = nfmsg->nfgen_family;
5631 struct nft_flowtable *flowtable;
36dd1bcc 5632 const struct nlattr *attr;
3b49e2e9
PNA		 5633 struct nft_table *table;
5634 struct nft_ctx ctx;
5635
e603ea4b
PNA		 5636 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5637 (!nla[NFTA_FLOWTABLE_NAME] &&
5638 !nla[NFTA_FLOWTABLE_HANDLE]))
5639 return -EINVAL;
5640
cac20fcd
PNA		 5641 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5642 genmask);
36dd1bcc
PNA		 5643 if (IS_ERR(table)) {
5644 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 5645 return PTR_ERR(table);
36dd1bcc 5646 }
3b49e2e9 5647
36dd1bcc
PNA		 5648 if (nla[NFTA_FLOWTABLE_HANDLE]) {
5649 attr = nla[NFTA_FLOWTABLE_HANDLE];
5650 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
5651 } else {
5652 attr = nla[NFTA_FLOWTABLE_NAME];
5653 flowtable = nft_flowtable_lookup(table, attr, genmask);
5654 }
5655
5656 if (IS_ERR(flowtable)) {
5657 NL_SET_BAD_ATTR(extack, attr);
5658 return PTR_ERR(flowtable);
5659 }
5660 if (flowtable->use > 0) {
5661 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 5662 return -EBUSY;
36dd1bcc 5663 }
3b49e2e9 5664
98319cb9 5665 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 5666
5667 return nft_delflowtable(&ctx, flowtable);
5668}
5669
5670static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5671 u32 portid, u32 seq, int event,
5672 u32 flags, int family,
5673 struct nft_flowtable *flowtable)
5674{
5675 struct nlattr *nest, *nest_devs;
5676 struct nfgenmsg *nfmsg;
5677 struct nlmsghdr *nlh;
5678 int i;
5679
5680 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5681 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5682 if (nlh == NULL)
5683 goto nla_put_failure;
5684
5685 nfmsg = nlmsg_data(nlh);
5686 nfmsg->nfgen_family = family;
5687 nfmsg->version = NFNETLINK_V0;
5688 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5689
5690 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5691 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 5692 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
5693 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
5694 NFTA_FLOWTABLE_PAD))
3b49e2e9
PNA		 5695 goto nla_put_failure;
5696
5697 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5698 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5699 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5700 goto nla_put_failure;
5701
5702 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5703 if (!nest_devs)
5704 goto nla_put_failure;
5705
5706 for (i = 0; i < flowtable->ops_len; i++) {
b8088dda
FW		 5707 const struct net_device *dev = READ_ONCE(flowtable->ops[i].dev);
5708
5709 if (dev &&
5710 nla_put_string(skb, NFTA_DEVICE_NAME, dev->name))
3b49e2e9
PNA		 5711 goto nla_put_failure;
5712 }
5713 nla_nest_end(skb, nest_devs);
5714 nla_nest_end(skb, nest);
5715
5716 nlmsg_end(skb, nlh);
5717 return 0;
5718
5719nla_put_failure:
5720 nlmsg_trim(skb, nlh);
5721 return -1;
5722}
5723
5724struct nft_flowtable_filter {
5725 char *table;
5726};
5727
5728static int nf_tables_dump_flowtable(struct sk_buff *skb,
5729 struct netlink_callback *cb)
5730{
5731 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5732 struct nft_flowtable_filter *filter = cb->data;
5733 unsigned int idx = 0, s_idx = cb->args[0];
5734 struct net *net = sock_net(skb->sk);
5735 int family = nfmsg->nfgen_family;
5736 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 5737 const struct nft_table *table;
5738
5739 rcu_read_lock();
5740 cb->seq = net->nft.base_seq;
5741
36596dad 5742 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 5743 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 5744 continue;
5745
36596dad
PNA		 5746 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5747 if (!nft_is_active(net, flowtable))
5748 goto cont;
5749 if (idx < s_idx)
5750 goto cont;
5751 if (idx > s_idx)
5752 memset(&cb->args[1], 0,
5753 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 5754 if (filter && filter->table &&
36596dad
PNA		 5755 strcmp(filter->table, table->name))
5756 goto cont;
3b49e2e9 5757
36596dad
PNA		 5758 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5759 cb->nlh->nlmsg_seq,
5760 NFT_MSG_NEWFLOWTABLE,
5761 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 5762 table->family, flowtable) < 0)
36596dad 5763 goto done;
3b49e2e9 5764
36596dad 5765 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 5766cont:
36596dad 5767 idx++;
3b49e2e9
PNA		 5768 }
5769 }
5770done:
5771 rcu_read_unlock();
5772
5773 cb->args[0] = idx;
5774 return skb->len;
5775}
5776
90fd131a 5777static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 5778{
90fd131a
FW		 5779 const struct nlattr * const *nla = cb->data;
5780 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 5781
90fd131a
FW		 5782 if (nla[NFTA_FLOWTABLE_TABLE]) {
5783 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5784 if (!filter)
5785 return -ENOMEM;
3b49e2e9 5786
90fd131a
FW		 5787 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5788 GFP_ATOMIC);
5789 if (!filter->table) {
5790 kfree(filter);
5791 return -ENOMEM;
5792 }
5793 }
3b49e2e9 5794
90fd131a 5795 cb->data = filter;
3b49e2e9
PNA		 5796 return 0;
5797}
5798
90fd131a 5799static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 5800{
90fd131a 5801 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 5802
3b49e2e9 5803 if (!filter)
90fd131a 5804 return 0;
3b49e2e9 5805
90fd131a
FW		 5806 kfree(filter->table);
5807 kfree(filter);
5808
5809 return 0;
3b49e2e9
PNA		 5810}
5811
d9adf22a 5812/* called with rcu_read_lock held */
3b49e2e9
PNA		 5813static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5814 struct sk_buff *skb,
5815 const struct nlmsghdr *nlh,
5816 const struct nlattr * const nla[],
5817 struct netlink_ext_ack *extack)
5818{
5819 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5820 u8 genmask = nft_genmask_cur(net);
5821 int family = nfmsg->nfgen_family;
5822 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 5823 const struct nft_table *table;
5824 struct sk_buff *skb2;
5825 int err;
5826
5827 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5828 struct netlink_dump_control c = {
90fd131a 5829 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 5830 .dump = nf_tables_dump_flowtable,
5831 .done = nf_tables_dump_flowtable_done,
d9adf22a 5832 .module = THIS_MODULE,
90fd131a 5833 .data = (void *)nla,
3b49e2e9
PNA		 5834 };
5835
d9adf22a 5836 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3b49e2e9
PNA		 5837 }
5838
5839 if (!nla[NFTA_FLOWTABLE_NAME])
5840 return -EINVAL;
5841
cac20fcd
PNA		 5842 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
5843 genmask);
3b49e2e9
PNA		 5844 if (IS_ERR(table))
5845 return PTR_ERR(table);
5846
cac20fcd
PNA		 5847 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5848 genmask);
03a0120f 5849 if (IS_ERR(flowtable))
3b49e2e9
PNA		 5850 return PTR_ERR(flowtable);
5851
d9adf22a 5852 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 5853 if (!skb2)
5854 return -ENOMEM;
5855
5856 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5857 nlh->nlmsg_seq,
5858 NFT_MSG_NEWFLOWTABLE, 0, family,
5859 flowtable);
5860 if (err < 0)
5861 goto err;
5862
5863 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5864err:
5865 kfree_skb(skb2);
5866 return err;
5867}
5868
5869static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5870 struct nft_flowtable *flowtable,
5871 int event)
5872{
5873 struct sk_buff *skb;
5874 int err;
5875
5876 if (ctx->report &&
5877 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5878 return;
5879
5880 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5881 if (skb == NULL)
5882 goto err;
5883
5884 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5885 ctx->seq, event, 0,
36596dad 5886 ctx->family, flowtable);
3b49e2e9
PNA		 5887 if (err < 0) {
5888 kfree_skb(skb);
5889 goto err;
5890 }
5891
5892 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5893 ctx->report, GFP_KERNEL);
5894 return;
5895err:
5896 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5897}
5898
3b49e2e9
PNA		 5899static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5900{
c04a3f73 5901 kfree(flowtable->ops);
3b49e2e9 5902 kfree(flowtable->name);
b408c5b0 5903 flowtable->data.type->free(&flowtable->data);
3b49e2e9 5904 module_put(flowtable->data.type->owner);
a12486eb 5905 kfree(flowtable);
3b49e2e9
PNA		 5906}
5907
84d7fce6
PNA		 5908static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5909 u32 portid, u32 seq)
5910{
5911 struct nlmsghdr *nlh;
5912 struct nfgenmsg *nfmsg;
784b4e61 5913 char buf[TASK_COMM_LEN];
dedb67c4 5914 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 5915
5916 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5917 if (nlh == NULL)
5918 goto nla_put_failure;
5919
5920 nfmsg = nlmsg_data(nlh);
5921 nfmsg->nfgen_family = AF_UNSPEC;
5922 nfmsg->version = NFNETLINK_V0;
5923 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5924
784b4e61
PS		 5925 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5926 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5927 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 5928 goto nla_put_failure;
5929
053c095a
JB		 5930 nlmsg_end(skb, nlh);
5931 return 0;
84d7fce6
PNA		 5932
5933nla_put_failure:
5934 nlmsg_trim(skb, nlh);
5935 return -EMSGSIZE;
5936}
5937
3b49e2e9
PNA		 5938static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5939 struct nft_flowtable *flowtable)
5940{
5941 int i;
5942
5943 for (i = 0; i < flowtable->ops_len; i++) {
5944 if (flowtable->ops[i].dev != dev)
5945 continue;
5946
5947 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5948 flowtable->ops[i].dev = NULL;
5949 break;
5950 }
5951}
5952
5953static int nf_tables_flowtable_event(struct notifier_block *this,
5954 unsigned long event, void *ptr)
5955{
5956 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5957 struct nft_flowtable *flowtable;
5958 struct nft_table *table;
0a2cf5ee 5959 struct net *net;
3b49e2e9
PNA		 5960
5961 if (event != NETDEV_UNREGISTER)
5962 return 0;
5963
6a48de01 5964 net = dev_net(dev);
9e619d87 5965 mutex_lock(&net->nft.commit_mutex);
0a2cf5ee 5966 list_for_each_entry(table, &net->nft.tables, list) {
36596dad
PNA		 5967 list_for_each_entry(flowtable, &table->flowtables, list) {
5968 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 5969 }
5970 }
9e619d87 5971 mutex_unlock(&net->nft.commit_mutex);
6a48de01 5972
3b49e2e9
PNA		 5973 return NOTIFY_DONE;
5974}
5975
5976static struct notifier_block nf_tables_flowtable_notifier = {
5977 .notifier_call = nf_tables_flowtable_event,
5978};
5979
25e94a99
PNA		 5980static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5981 int event)
84d7fce6
PNA		 5982{
5983 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5984 struct sk_buff *skb2;
5985 int err;
5986
5987 if (nlmsg_report(nlh) &&
5988 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5989 return;
84d7fce6 5990
84d7fce6
PNA		 5991 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5992 if (skb2 == NULL)
5993 goto err;
5994
5995 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5996 nlh->nlmsg_seq);
5997 if (err < 0) {
5998 kfree_skb(skb2);
5999 goto err;
6000 }
6001
25e94a99
PNA		 6002 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6003 nlmsg_report(nlh), GFP_KERNEL);
6004 return;
84d7fce6 6005err:
25e94a99
PNA		 6006 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6007 -ENOBUFS);
84d7fce6
PNA		 6008}
6009
7b8002a1
PNA		 6010static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6011 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 6012 const struct nlattr * const nla[],
6013 struct netlink_ext_ack *extack)
84d7fce6 6014{
84d7fce6
PNA		 6015 struct sk_buff *skb2;
6016 int err;
6017
d9adf22a 6018 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 6019 if (skb2 == NULL)
6020 return -ENOMEM;
6021
6022 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6023 nlh->nlmsg_seq);
6024 if (err < 0)
6025 goto err;
6026
6027 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6028err:
6029 kfree_skb(skb2);
6030 return err;
6031}
6032
96518518
PM		 6033static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6034 [NFT_MSG_NEWTABLE] = {
55dd6f93 6035 .call_batch = nf_tables_newtable,
96518518
PM		 6036 .attr_count = NFTA_TABLE_MAX,
6037 .policy = nft_table_policy,
6038 },
6039 [NFT_MSG_GETTABLE] = {
d9adf22a 6040 .call_rcu = nf_tables_gettable,
96518518
PM		 6041 .attr_count = NFTA_TABLE_MAX,
6042 .policy = nft_table_policy,
6043 },
6044 [NFT_MSG_DELTABLE] = {
55dd6f93 6045 .call_batch = nf_tables_deltable,
96518518
PM		 6046 .attr_count = NFTA_TABLE_MAX,
6047 .policy = nft_table_policy,
6048 },
6049 [NFT_MSG_NEWCHAIN] = {
91c7b38d 6050 .call_batch = nf_tables_newchain,
96518518
PM		 6051 .attr_count = NFTA_CHAIN_MAX,
6052 .policy = nft_chain_policy,
6053 },
6054 [NFT_MSG_GETCHAIN] = {
d9adf22a 6055 .call_rcu = nf_tables_getchain,
96518518
PM		 6056 .attr_count = NFTA_CHAIN_MAX,
6057 .policy = nft_chain_policy,
6058 },
6059 [NFT_MSG_DELCHAIN] = {
91c7b38d 6060 .call_batch = nf_tables_delchain,
96518518
PM		 6061 .attr_count = NFTA_CHAIN_MAX,
6062 .policy = nft_chain_policy,
6063 },
6064 [NFT_MSG_NEWRULE] = {
0628b123 6065 .call_batch = nf_tables_newrule,
96518518
PM		 6066 .attr_count = NFTA_RULE_MAX,
6067 .policy = nft_rule_policy,
6068 },
6069 [NFT_MSG_GETRULE] = {
d9adf22a 6070 .call_rcu = nf_tables_getrule,
96518518
PM		 6071 .attr_count = NFTA_RULE_MAX,
6072 .policy = nft_rule_policy,
6073 },
6074 [NFT_MSG_DELRULE] = {
0628b123 6075 .call_batch = nf_tables_delrule,
96518518
PM		 6076 .attr_count = NFTA_RULE_MAX,
6077 .policy = nft_rule_policy,
6078 },
20a69341 6079 [NFT_MSG_NEWSET] = {
958bee14 6080 .call_batch = nf_tables_newset,
20a69341
PM		 6081 .attr_count = NFTA_SET_MAX,
6082 .policy = nft_set_policy,
6083 },
6084 [NFT_MSG_GETSET] = {
d9adf22a 6085 .call_rcu = nf_tables_getset,
20a69341
PM		 6086 .attr_count = NFTA_SET_MAX,
6087 .policy = nft_set_policy,
6088 },
6089 [NFT_MSG_DELSET] = {
958bee14 6090 .call_batch = nf_tables_delset,
20a69341
PM		 6091 .attr_count = NFTA_SET_MAX,
6092 .policy = nft_set_policy,
6093 },
6094 [NFT_MSG_NEWSETELEM] = {
958bee14 6095 .call_batch = nf_tables_newsetelem,
20a69341
PM		 6096 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6097 .policy = nft_set_elem_list_policy,
6098 },
6099 [NFT_MSG_GETSETELEM] = {
d9adf22a 6100 .call_rcu = nf_tables_getsetelem,
20a69341
PM		 6101 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6102 .policy = nft_set_elem_list_policy,
6103 },
6104 [NFT_MSG_DELSETELEM] = {
958bee14 6105 .call_batch = nf_tables_delsetelem,
20a69341
PM		 6106 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6107 .policy = nft_set_elem_list_policy,
6108 },
84d7fce6 6109 [NFT_MSG_GETGEN] = {
d9adf22a 6110 .call_rcu = nf_tables_getgen,
84d7fce6 6111 },
e5009240
PNA		 6112 [NFT_MSG_NEWOBJ] = {
6113 .call_batch = nf_tables_newobj,
6114 .attr_count = NFTA_OBJ_MAX,
6115 .policy = nft_obj_policy,
6116 },
6117 [NFT_MSG_GETOBJ] = {
d9adf22a 6118 .call_rcu = nf_tables_getobj,
e5009240
PNA		 6119 .attr_count = NFTA_OBJ_MAX,
6120 .policy = nft_obj_policy,
6121 },
6122 [NFT_MSG_DELOBJ] = {
6123 .call_batch = nf_tables_delobj,
6124 .attr_count = NFTA_OBJ_MAX,
6125 .policy = nft_obj_policy,
6126 },
43da04a5 6127 [NFT_MSG_GETOBJ_RESET] = {
d9adf22a 6128 .call_rcu = nf_tables_getobj,
43da04a5
PNA		 6129 .attr_count = NFTA_OBJ_MAX,
6130 .policy = nft_obj_policy,
6131 },
3b49e2e9
PNA		 6132 [NFT_MSG_NEWFLOWTABLE] = {
6133 .call_batch = nf_tables_newflowtable,
6134 .attr_count = NFTA_FLOWTABLE_MAX,
6135 .policy = nft_flowtable_policy,
6136 },
6137 [NFT_MSG_GETFLOWTABLE] = {
d9adf22a 6138 .call_rcu = nf_tables_getflowtable,
3b49e2e9
PNA		 6139 .attr_count = NFTA_FLOWTABLE_MAX,
6140 .policy = nft_flowtable_policy,
6141 },
6142 [NFT_MSG_DELFLOWTABLE] = {
6143 .call_batch = nf_tables_delflowtable,
6144 .attr_count = NFTA_FLOWTABLE_MAX,
6145 .policy = nft_flowtable_policy,
6146 },
96518518
PM		 6147};
6148
a654de8f
PNA		 6149static int nf_tables_validate(struct net *net)
6150{
6151 struct nft_table *table;
6152
6153 switch (net->nft.validate_state) {
6154 case NFT_VALIDATE_SKIP:
6155 break;
6156 case NFT_VALIDATE_NEED:
6157 nft_validate_state_update(net, NFT_VALIDATE_DO);
6158 /* fall through */
6159 case NFT_VALIDATE_DO:
6160 list_for_each_entry(table, &net->nft.tables, list) {
6161 if (nft_table_validate(net, table) < 0)
6162 return -EAGAIN;
6163 }
6164 break;
6165 }
6166
6167 return 0;
6168}
6169
91c7b38d
PNA		 6170static void nft_chain_commit_update(struct nft_trans *trans)
6171{
6172 struct nft_base_chain *basechain;
6173
1b2470e5
FW		 6174 if (nft_trans_chain_name(trans)) {
6175 rhltable_remove(&trans->ctx.table->chains_ht,
6176 &trans->ctx.chain->rhlhead,
6177 nft_chain_ht_params);
d71efb59 6178 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 6179 rhltable_insert_key(&trans->ctx.table->chains_ht,
6180 trans->ctx.chain->name,
6181 &trans->ctx.chain->rhlhead,
6182 nft_chain_ht_params);
6183 }
91c7b38d 6184
f323d954 6185 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 6186 return;
6187
6188 basechain = nft_base_chain(trans->ctx.chain);
6189 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
6190
6191 switch (nft_trans_chain_policy(trans)) {
6192 case NF_DROP:
6193 case NF_ACCEPT:
6194 basechain->policy = nft_trans_chain_policy(trans);
6195 break;
6196 }
6197}
6198
2f99aa31 6199static void nft_commit_release(struct nft_trans *trans)
c7c32e72 6200{
c7c32e72
PNA		 6201 switch (trans->msg_type) {
6202 case NFT_MSG_DELTABLE:
6203 nf_tables_table_destroy(&trans->ctx);
6204 break;
9f8aac0b
FW		 6205 case NFT_MSG_NEWCHAIN:
6206 kfree(nft_trans_chain_name(trans));
6207 break;
c7c32e72 6208 case NFT_MSG_DELCHAIN:
43a605f2 6209 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 6210 break;
6211 case NFT_MSG_DELRULE:
6212 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6213 break;
6214 case NFT_MSG_DELSET:
6215 nft_set_destroy(nft_trans_set(trans));
6216 break;
61edafbb 6217 case NFT_MSG_DELSETELEM:
3453c927
PNA		 6218 nf_tables_set_elem_destroy(&trans->ctx,
6219 nft_trans_elem_set(trans),
59105446 6220 nft_trans_elem(trans).priv);
61edafbb 6221 break;
e5009240 6222 case NFT_MSG_DELOBJ:
00bfb320 6223 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 6224 break;
3b49e2e9
PNA		 6225 case NFT_MSG_DELFLOWTABLE:
6226 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6227 break;
c7c32e72 6228 }
0935d558
FW		 6229
6230 if (trans->put_net)
6231 put_net(trans->ctx.net);
6232
c7c32e72
PNA		 6233 kfree(trans);
6234}
6235
0935d558 6236static void nf_tables_trans_destroy_work(struct work_struct *w)
2f99aa31
FW		 6237{
6238 struct nft_trans *trans, *next;
0935d558
FW		 6239 LIST_HEAD(head);
6240
6241 spin_lock(&nf_tables_destroy_list_lock);
6242 list_splice_init(&nf_tables_destroy_list, &head);
6243 spin_unlock(&nf_tables_destroy_list_lock);
2f99aa31 6244
0935d558 6245 if (list_empty(&head))
2f99aa31
FW		 6246 return;
6247
6248 synchronize_rcu();
6249
0935d558 6250 list_for_each_entry_safe(trans, next, &head, list) {
2f99aa31
FW		 6251 list_del(&trans->list);
6252 nft_commit_release(trans);
6253 }
6254}
6255
0cbc06b3
FW		 6256static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
6257{
6258 struct nft_rule *rule;
6259 unsigned int alloc = 0;
6260 int i;
6261
6262 /* already handled or inactive chain? */
6263 if (chain->rules_next || !nft_is_active_next(net, chain))
6264 return 0;
6265
6266 rule = list_entry(&chain->rules, struct nft_rule, list);
6267 i = 0;
6268
6269 list_for_each_entry_continue(rule, &chain->rules, list) {
6270 if (nft_is_active_next(net, rule))
6271 alloc++;
6272 }
6273
6274 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
6275 if (!chain->rules_next)
6276 return -ENOMEM;
6277
6278 list_for_each_entry_continue(rule, &chain->rules, list) {
6279 if (nft_is_active_next(net, rule))
6280 chain->rules_next[i++] = rule;
6281 }
6282
6283 chain->rules_next[i] = NULL;
6284 return 0;
6285}
6286
6287static void nf_tables_commit_chain_prepare_cancel(struct net *net)
6288{
6289 struct nft_trans *trans, *next;
6290
6291 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6292 struct nft_chain *chain = trans->ctx.chain;
6293
6294 if (trans->msg_type == NFT_MSG_NEWRULE ||
6295 trans->msg_type == NFT_MSG_DELRULE) {
6296 kvfree(chain->rules_next);
6297 chain->rules_next = NULL;
6298 }
6299 }
6300}
6301
6302static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
6303{
6304 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
6305
6306 kvfree(o->start);
6307}
6308
6309static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
6310{
6311 struct nft_rule **r = rules;
6312 struct nft_rules_old *old;
6313
6314 while (*r)
6315 r++;
6316
6317 r++; /* rcu_head is after end marker */
6318 old = (void *) r;
6319 old->start = rules;
6320
6321 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
6322}
6323
0fb39bbe 6324static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
0cbc06b3
FW		 6325{
6326 struct nft_rule **g0, **g1;
6327 bool next_genbit;
6328
6329 next_genbit = nft_gencursor_next(net);
6330
6331 g0 = rcu_dereference_protected(chain->rules_gen_0,
f102d66b 6332 lockdep_commit_lock_is_held(net));
0cbc06b3 6333 g1 = rcu_dereference_protected(chain->rules_gen_1,
f102d66b 6334 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 6335
6336 /* No changes to this chain? */
6337 if (chain->rules_next == NULL) {
6338 /* chain had no change in last or next generation */
6339 if (g0 == g1)
6340 return;
6341 /*
6342 * chain had no change in this generation; make sure next
6343 * one uses same rules as current generation.
6344 */
6345 if (next_genbit) {
6346 rcu_assign_pointer(chain->rules_gen_1, g0);
6347 nf_tables_commit_chain_free_rules_old(g1);
6348 } else {
6349 rcu_assign_pointer(chain->rules_gen_0, g1);
6350 nf_tables_commit_chain_free_rules_old(g0);
6351 }
6352
6353 return;
6354 }
6355
6356 if (next_genbit)
6357 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
6358 else
6359 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
6360
6361 chain->rules_next = NULL;
6362
6363 if (g0 == g1)
6364 return;
6365
6366 if (next_genbit)
6367 nf_tables_commit_chain_free_rules_old(g1);
6368 else
6369 nf_tables_commit_chain_free_rules_old(g0);
6370}
6371
1b2470e5
FW		 6372static void nft_chain_del(struct nft_chain *chain)
6373{
6374 struct nft_table *table = chain->table;
6375
6376 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
6377 nft_chain_ht_params));
6378 list_del_rcu(&chain->list);
6379}
6380
0935d558
FW		 6381static void nf_tables_commit_release(struct net *net)
6382{
6383 struct nft_trans *trans;
6384
6385 /* all side effects have to be made visible.
6386 * For example, if a chain named 'foo' has been deleted, a
6387 * new transaction must not find it anymore.
6388 *
6389 * Memory reclaim happens asynchronously from work queue
6390 * to prevent expensive synchronize_rcu() in commit phase.
6391 */
6392 if (list_empty(&net->nft.commit_list)) {
6393 mutex_unlock(&net->nft.commit_mutex);
6394 return;
6395 }
6396
6397 trans = list_last_entry(&net->nft.commit_list,
6398 struct nft_trans, list);
6399 get_net(trans->ctx.net);
6400 WARN_ON_ONCE(trans->put_net);
6401
6402 trans->put_net = true;
6403 spin_lock(&nf_tables_destroy_list_lock);
6404 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
6405 spin_unlock(&nf_tables_destroy_list_lock);
6406
6407 mutex_unlock(&net->nft.commit_mutex);
6408
6409 schedule_work(&trans_destroy_work);
6410}
6411
5913beaf 6412static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 6413{
37082f93 6414 struct nft_trans *trans, *next;
a3716e70 6415 struct nft_trans_elem *te;
0cbc06b3
FW		 6416 struct nft_chain *chain;
6417 struct nft_table *table;
37082f93 6418
a654de8f
PNA		 6419 /* 0. Validate ruleset, otherwise roll back for error reporting. */
6420 if (nf_tables_validate(net) < 0)
6421 return -EAGAIN;
6422
0cbc06b3
FW		 6423 /* 1. Allocate space for next generation rules_gen_X[] */
6424 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
6425 int ret;
37082f93 6426
0cbc06b3
FW		 6427 if (trans->msg_type == NFT_MSG_NEWRULE ||
6428 trans->msg_type == NFT_MSG_DELRULE) {
6429 chain = trans->ctx.chain;
6430
6431 ret = nf_tables_commit_chain_prepare(net, chain);
6432 if (ret < 0) {
6433 nf_tables_commit_chain_prepare_cancel(net);
6434 return ret;
6435 }
6436 }
6437 }
37082f93 6438
0cbc06b3
FW		 6439 /* step 2. Make rules_gen_X visible to packet path */
6440 list_for_each_entry(table, &net->nft.tables, list) {
0fb39bbe
FW		 6441 list_for_each_entry(chain, &table->chains, list)
6442 nf_tables_commit_chain(net, chain);
0cbc06b3
FW		 6443 }
6444
6445 /*
6446 * Bump generation counter, invalidate any dump in progress.
6447 * Cannot fail after this point.
37082f93 6448 */
0cbc06b3
FW		 6449 while (++net->nft.base_seq == 0);
6450
6451 /* step 3. Start new generation, rules_gen_X now in use. */
6452 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 6453
6454 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 6455 switch (trans->msg_type) {
55dd6f93
PNA		 6456 case NFT_MSG_NEWTABLE:
6457 if (nft_trans_table_update(trans)) {
6458 if (!nft_trans_table_enable(trans)) {
664b0f8c 6459 nf_tables_table_disable(net,
55dd6f93
PNA		 6460 trans->ctx.table);
6461 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6462 }
6463 } else {
f2a6d766 6464 nft_clear(net, trans->ctx.table);
55dd6f93 6465 }
35151d84 6466 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 6467 nft_trans_destroy(trans);
6468 break;
6469 case NFT_MSG_DELTABLE:
f2a6d766 6470 list_del_rcu(&trans->ctx.table->list);
35151d84 6471 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 6472 break;
91c7b38d 6473 case NFT_MSG_NEWCHAIN:
9f8aac0b 6474 if (nft_trans_chain_update(trans)) {
91c7b38d 6475 nft_chain_commit_update(trans);
9f8aac0b
FW		 6476 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6477 /* trans destroyed after rcu grace period */
6478 } else {
664b0f8c 6479 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 6480 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
6481 nft_trans_destroy(trans);
6482 }
91c7b38d
PNA		 6483 break;
6484 case NFT_MSG_DELCHAIN:
1b2470e5 6485 nft_chain_del(trans->ctx.chain);
35151d84 6486 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 6487 nf_tables_unregister_hook(trans->ctx.net,
6488 trans->ctx.table,
6489 trans->ctx.chain);
91c7b38d 6490 break;
b380e5c7 6491 case NFT_MSG_NEWRULE:
889f7ee7 6492 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 6493 nf_tables_rule_notify(&trans->ctx,
37082f93 6494 nft_trans_rule(trans),
35151d84 6495 NFT_MSG_NEWRULE);
37082f93 6496 nft_trans_destroy(trans);
b380e5c7
PNA		 6497 break;
6498 case NFT_MSG_DELRULE:
6499 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 6500 nf_tables_rule_notify(&trans->ctx,
6501 nft_trans_rule(trans),
6502 NFT_MSG_DELRULE);
b380e5c7 6503 break;
958bee14 6504 case NFT_MSG_NEWSET:
37a9cc52 6505 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 6506 /* This avoids hitting -EBUSY when deleting the table
6507 * from the transaction.
6508 */
408070d6 6509 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 6510 !list_empty(&nft_trans_set(trans)->bindings))
6511 trans->ctx.table->use--;
6512
958bee14 6513 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 6514 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 6515 nft_trans_destroy(trans);
6516 break;
6517 case NFT_MSG_DELSET:
37a9cc52 6518 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 6519 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 6520 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 6521 break;
60319eb1 6522 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 6523 te = (struct nft_trans_elem *)trans->data;
6524
42a55769 6525 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 6526 nf_tables_setelem_notify(&trans->ctx, te->set,
6527 &te->elem,
60319eb1
PNA		 6528 NFT_MSG_NEWSETELEM, 0);
6529 nft_trans_destroy(trans);
6530 break;
6531 case NFT_MSG_DELSETELEM:
a3716e70 6532 te = (struct nft_trans_elem *)trans->data;
fe2811eb 6533
a3716e70
PNA		 6534 nf_tables_setelem_notify(&trans->ctx, te->set,
6535 &te->elem,
60319eb1 6536 NFT_MSG_DELSETELEM, 0);
5cb82a38 6537 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 6538 atomic_dec(&te->set->nelems);
6539 te->set->ndeact--;
60319eb1 6540 break;
e5009240
PNA		 6541 case NFT_MSG_NEWOBJ:
6542 nft_clear(net, nft_trans_obj(trans));
6543 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6544 NFT_MSG_NEWOBJ);
6545 nft_trans_destroy(trans);
6546 break;
6547 case NFT_MSG_DELOBJ:
6548 list_del_rcu(&nft_trans_obj(trans)->list);
6549 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
6550 NFT_MSG_DELOBJ);
6551 break;
3b49e2e9
PNA		 6552 case NFT_MSG_NEWFLOWTABLE:
6553 nft_clear(net, nft_trans_flowtable(trans));
6554 nf_tables_flowtable_notify(&trans->ctx,
6555 nft_trans_flowtable(trans),
6556 NFT_MSG_NEWFLOWTABLE);
6557 nft_trans_destroy(trans);
6558 break;
6559 case NFT_MSG_DELFLOWTABLE:
6560 list_del_rcu(&nft_trans_flowtable(trans)->list);
6561 nf_tables_flowtable_notify(&trans->ctx,
6562 nft_trans_flowtable(trans),
6563 NFT_MSG_DELFLOWTABLE);
6564 nft_unregister_flowtable_net_hooks(net,
6565 nft_trans_flowtable(trans));
6566 break;
37082f93 6567 }
37082f93
PNA		 6568 }
6569
84d7fce6 6570 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
0935d558 6571 nf_tables_commit_release(net);
37082f93
PNA		 6572
6573 return 0;
6574}
6575
b326dd37 6576static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 6577{
c7c32e72
PNA		 6578 switch (trans->msg_type) {
6579 case NFT_MSG_NEWTABLE:
6580 nf_tables_table_destroy(&trans->ctx);
6581 break;
6582 case NFT_MSG_NEWCHAIN:
43a605f2 6583 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 6584 break;
6585 case NFT_MSG_NEWRULE:
6586 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6587 break;
6588 case NFT_MSG_NEWSET:
6589 nft_set_destroy(nft_trans_set(trans));
6590 break;
61edafbb
PM		 6591 case NFT_MSG_NEWSETELEM:
6592 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 6593 nft_trans_elem(trans).priv, true);
61edafbb 6594 break;
e5009240 6595 case NFT_MSG_NEWOBJ:
00bfb320 6596 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 6597 break;
3b49e2e9
PNA		 6598 case NFT_MSG_NEWFLOWTABLE:
6599 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6600 break;
c7c32e72
PNA		 6601 }
6602 kfree(trans);
6603}
6604
71ad00c5 6605static int __nf_tables_abort(struct net *net)
37082f93 6606{
37082f93 6607 struct nft_trans *trans, *next;
02263db0 6608 struct nft_trans_elem *te;
37082f93 6609
a907e36d
XL		 6610 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
6611 list) {
b380e5c7 6612 switch (trans->msg_type) {
55dd6f93
PNA		 6613 case NFT_MSG_NEWTABLE:
6614 if (nft_trans_table_update(trans)) {
6615 if (nft_trans_table_enable(trans)) {
664b0f8c 6616 nf_tables_table_disable(net,
55dd6f93
PNA		 6617 trans->ctx.table);
6618 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
6619 }
6620 nft_trans_destroy(trans);
6621 } else {
e688a7f8 6622 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 6623 }
6624 break;
6625 case NFT_MSG_DELTABLE:
f2a6d766 6626 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 6627 nft_trans_destroy(trans);
6628 break;
91c7b38d
PNA		 6629 case NFT_MSG_NEWCHAIN:
6630 if (nft_trans_chain_update(trans)) {
982f4051 6631 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 6632 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 6633 nft_trans_destroy(trans);
6634 } else {
4fefee57 6635 trans->ctx.table->use--;
1b2470e5 6636 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 6637 nf_tables_unregister_hook(trans->ctx.net,
6638 trans->ctx.table,
6639 trans->ctx.chain);
91c7b38d
PNA		 6640 }
6641 break;
6642 case NFT_MSG_DELCHAIN:
4fefee57 6643 trans->ctx.table->use++;
664b0f8c 6644 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 6645 nft_trans_destroy(trans);
6646 break;
b380e5c7 6647 case NFT_MSG_NEWRULE:
4fefee57 6648 trans->ctx.chain->use--;
b380e5c7 6649 list_del_rcu(&nft_trans_rule(trans)->list);
bb7b40ae 6650 nft_rule_expr_deactivate(&trans->ctx, nft_trans_rule(trans));
b380e5c7
PNA		 6651 break;
6652 case NFT_MSG_DELRULE:
4fefee57 6653 trans->ctx.chain->use++;
889f7ee7 6654 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 6655 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
37082f93 6656 nft_trans_destroy(trans);
b380e5c7 6657 break;
958bee14 6658 case NFT_MSG_NEWSET:
4fefee57 6659 trans->ctx.table->use--;
e688a7f8 6660 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 6661 break;
6662 case NFT_MSG_DELSET:
4fefee57 6663 trans->ctx.table->use++;
37a9cc52 6664 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 6665 nft_trans_destroy(trans);
6666 break;
60319eb1 6667 case NFT_MSG_NEWSETELEM:
02263db0 6668 te = (struct nft_trans_elem *)trans->data;
fe2811eb 6669
5cb82a38 6670 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 6671 atomic_dec(&te->set->nelems);
60319eb1
PNA		 6672 break;
6673 case NFT_MSG_DELSETELEM:
cc02e457
PM		 6674 te = (struct nft_trans_elem *)trans->data;
6675
59105446 6676 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 6677 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 6678 te->set->ndeact--;
cc02e457 6679
e5009240
PNA		 6680 nft_trans_destroy(trans);
6681 break;
6682 case NFT_MSG_NEWOBJ:
6683 trans->ctx.table->use--;
6684 list_del_rcu(&nft_trans_obj(trans)->list);
6685 break;
6686 case NFT_MSG_DELOBJ:
6687 trans->ctx.table->use++;
6688 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 6689 nft_trans_destroy(trans);
6690 break;
3b49e2e9
PNA		 6691 case NFT_MSG_NEWFLOWTABLE:
6692 trans->ctx.table->use--;
6693 list_del_rcu(&nft_trans_flowtable(trans)->list);
6694 nft_unregister_flowtable_net_hooks(net,
6695 nft_trans_flowtable(trans));
6696 break;
6697 case NFT_MSG_DELFLOWTABLE:
6698 trans->ctx.table->use++;
6699 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6700 nft_trans_destroy(trans);
6701 break;
37082f93 6702 }
37082f93
PNA		 6703 }
6704
b326dd37
PNA		 6705 synchronize_rcu();
6706
a1cee076
PNA		 6707 list_for_each_entry_safe_reverse(trans, next,
6708 &net->nft.commit_list, list) {
c7c32e72 6709 list_del(&trans->list);
b326dd37 6710 nf_tables_abort_release(trans);
37082f93
PNA		 6711 }
6712
6713 return 0;
6714}
6715
a654de8f
PNA		 6716static void nf_tables_cleanup(struct net *net)
6717{
6718 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
6719}
6720
71ad00c5
FW		 6721static int nf_tables_abort(struct net *net, struct sk_buff *skb)
6722{
f102d66b
FW		 6723 int ret = __nf_tables_abort(net);
6724
6725 mutex_unlock(&net->nft.commit_mutex);
6726
6727 return ret;
71ad00c5
FW		 6728}
6729
74e8bcd2
PNA		 6730static bool nf_tables_valid_genid(struct net *net, u32 genid)
6731{
f102d66b
FW		 6732 bool genid_ok;
6733
6734 mutex_lock(&net->nft.commit_mutex);
6735
6736 genid_ok = genid == 0 || net->nft.base_seq == genid;
6737 if (!genid_ok)
6738 mutex_unlock(&net->nft.commit_mutex);
6739
6740 /* else, commit mutex has to be released by commit or abort function */
6741 return genid_ok;
74e8bcd2
PNA		 6742}
6743
96518518
PM		 6744static const struct nfnetlink_subsystem nf_tables_subsys = {
6745 .name = "nf_tables",
6746 .subsys_id = NFNL_SUBSYS_NFTABLES,
6747 .cb_count = NFT_MSG_MAX,
6748 .cb = nf_tables_cb,
0628b123
PNA		 6749 .commit = nf_tables_commit,
6750 .abort = nf_tables_abort,
a654de8f 6751 .cleanup = nf_tables_cleanup,
74e8bcd2 6752 .valid_genid = nf_tables_valid_genid,
be2ab5b4 6753 .owner = THIS_MODULE,
96518518
PM		 6754};
6755
7210e4e3 6756int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 6757 enum nft_chain_types type)
7210e4e3
PNA		 6758{
6759 const struct nft_base_chain *basechain;
6760
f323d954 6761 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 6762 basechain = nft_base_chain(chain);
6763 if (basechain->type->type != type)
6764 return -EOPNOTSUPP;
6765 }
6766 return 0;
6767}
6768EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6769
75e8d06d
PNA		 6770int nft_chain_validate_hooks(const struct nft_chain *chain,
6771 unsigned int hook_flags)
6772{
6773 struct nft_base_chain *basechain;
6774
f323d954 6775 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 6776 basechain = nft_base_chain(chain);
6777
c974a3a3 6778 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 6779 return 0;
6780
6781 return -EOPNOTSUPP;
6782 }
6783
6784 return 0;
6785}
6786EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6787
20a69341
PM		 6788/*
6789 * Loop detection - walk through the ruleset beginning at the destination chain
6790 * of a new jump until either the source chain is reached (loop) or all
6791 * reachable chains have been traversed.
6792 *
6793 * The loop check is performed whenever a new jump verdict is added to an
6794 * expression or verdict map or a verdict map is bound to a new chain.
6795 */
6796
6797static int nf_tables_check_loops(const struct nft_ctx *ctx,
6798 const struct nft_chain *chain);
6799
6800static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 6801 struct nft_set *set,
20a69341 6802 const struct nft_set_iter *iter,
de70185d 6803 struct nft_set_elem *elem)
20a69341 6804{
fe2811eb
PM		 6805 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6806 const struct nft_data *data;
6807
6808 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6809 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 6810 return 0;
6811
fe2811eb 6812 data = nft_set_ext_data(ext);
1ca2e170 6813 switch (data->verdict.code) {
20a69341
PM		 6814 case NFT_JUMP:
6815 case NFT_GOTO:
1ca2e170 6816 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 6817 default:
6818 return 0;
6819 }
6820}
6821
6822static int nf_tables_check_loops(const struct nft_ctx *ctx,
6823 const struct nft_chain *chain)
6824{
6825 const struct nft_rule *rule;
6826 const struct nft_expr *expr, *last;
de70185d 6827 struct nft_set *set;
20a69341
PM		 6828 struct nft_set_binding *binding;
6829 struct nft_set_iter iter;
20a69341
PM		 6830
6831 if (ctx->chain == chain)
6832 return -ELOOP;
6833
6834 list_for_each_entry(rule, &chain->rules, list) {
6835 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 6836 struct nft_immediate_expr *priv;
6837 const struct nft_data *data;
0ca743a5
PNA		 6838 int err;
6839
a654de8f 6840 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 6841 continue;
6842
a654de8f
PNA		 6843 priv = nft_expr_priv(expr);
6844 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 6845 continue;
20a69341 6846
a654de8f 6847 data = &priv->data;
1ca2e170 6848 switch (data->verdict.code) {
20a69341
PM		 6849 case NFT_JUMP:
6850 case NFT_GOTO:
1ca2e170
PM		 6851 err = nf_tables_check_loops(ctx,
6852 data->verdict.chain);
20a69341
PM		 6853 if (err < 0)
6854 return err;
6855 default:
6856 break;
6857 }
6858 }
6859 }
6860
6861 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 6862 if (!nft_is_active_next(ctx->net, set))
6863 continue;
20a69341
PM		 6864 if (!(set->flags & NFT_SET_MAP) ||
6865 set->dtype != NFT_DATA_VERDICT)
6866 continue;
6867
6868 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 6869 if (!(binding->flags & NFT_SET_MAP) ||
6870 binding->chain != chain)
20a69341
PM		 6871 continue;
6872
8588ac09 6873 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 6874 iter.skip = 0;
6875 iter.count = 0;
6876 iter.err = 0;
6877 iter.fn = nf_tables_loop_check_setelem;
6878
6879 set->ops->walk(ctx, set, &iter);
6880 if (iter.err < 0)
6881 return iter.err;
6882 }
6883 }
6884
6885 return 0;
6886}
6887
36b701fa
LGL		 6888/**
6889 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6890 *
6891 * @attr: netlink attribute to fetch value from
6892 * @max: maximum value to be stored in dest
6893 * @dest: pointer to the variable
6894 *
6895 * Parse, check and store a given u32 netlink attribute into variable.
6896 * This function returns -ERANGE if the value goes over maximum value.
6897 * Otherwise a 0 is returned and the attribute value is stored in the
6898 * destination variable.
6899 */
f1d505bb 6900int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 6901{
09525a09 6902 u32 val;
36b701fa
LGL		 6903
6904 val = ntohl(nla_get_be32(attr));
6905 if (val > max)
6906 return -ERANGE;
6907
6908 *dest = val;
6909 return 0;
6910}
6911EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6912
49499c3e
PM		 6913/**
6914 * nft_parse_register - parse a register value from a netlink attribute
6915 *
6916 * @attr: netlink attribute
6917 *
6918 * Parse and translate a register value from a netlink attribute.
6919 * Registers used to be 128 bit wide, these register numbers will be
6920 * mapped to the corresponding 32 bit register numbers.
6921 */
b1c96ed3
PM		 6922unsigned int nft_parse_register(const struct nlattr *attr)
6923{
49499c3e
PM		 6924 unsigned int reg;
6925
6926 reg = ntohl(nla_get_be32(attr));
6927 switch (reg) {
6928 case NFT_REG_VERDICT...NFT_REG_4:
6929 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6930 default:
6931 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6932 }
b1c96ed3
PM		 6933}
6934EXPORT_SYMBOL_GPL(nft_parse_register);
6935
49499c3e
PM		 6936/**
6937 * nft_dump_register - dump a register value to a netlink attribute
6938 *
6939 * @skb: socket buffer
6940 * @attr: attribute number
6941 * @reg: register number
6942 *
6943 * Construct a netlink attribute containing the register number. For
6944 * compatibility reasons, register numbers being a multiple of 4 are
6945 * translated to the corresponding 128 bit register numbers.
6946 */
b1c96ed3
PM		 6947int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6948{
49499c3e
PM		 6949 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6950 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6951 else
6952 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6953
b1c96ed3
PM		 6954 return nla_put_be32(skb, attr, htonl(reg));
6955}
6956EXPORT_SYMBOL_GPL(nft_dump_register);
6957
96518518 6958/**
d07db988 6959 * nft_validate_register_load - validate a load from a register
96518518
PM		 6960 *
6961 * @reg: the register number
d07db988 6962 * @len: the length of the data
96518518
PM		 6963 *
6964 * Validate that the input register is one of the general purpose
d07db988 6965 * registers and that the length of the load is within the bounds.
96518518 6966 */
d07db988 6967int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 6968{
49499c3e 6969 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 6970 return -EINVAL;
d07db988
PM		 6971 if (len == 0)
6972 return -EINVAL;
49499c3e 6973 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
d07db988 6974 return -ERANGE;
49499c3e 6975
96518518
PM		 6976 return 0;
6977}
d07db988 6978EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 6979
96518518 6980/**
1ec10212 6981 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 6982 *
6983 * @ctx: context of the expression performing the load
6984 * @reg: the destination register number
6985 * @data: the data to load
6986 * @type: the data type
45d9bcda 6987 * @len: the length of the data
96518518
PM		 6988 *
6989 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 6990 * the destination register and the length is within the bounds.
6991 * A value of NULL for the data means that its runtime gathered
58f40ab6 6992 * data.
96518518 6993 */
1ec10212
PM		 6994int nft_validate_register_store(const struct nft_ctx *ctx,
6995 enum nft_registers reg,
6996 const struct nft_data *data,
6997 enum nft_data_types type, unsigned int len)
96518518 6998{
20a69341
PM		 6999 int err;
7000
96518518
PM		 7001 switch (reg) {
7002 case NFT_REG_VERDICT:
58f40ab6 7003 if (type != NFT_DATA_VERDICT)
96518518 7004 return -EINVAL;
20a69341 7005
58f40ab6 7006 if (data != NULL &&
1ca2e170
PM		 7007 (data->verdict.code == NFT_GOTO ||
7008 data->verdict.code == NFT_JUMP)) {
7009 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 7010 if (err < 0)
7011 return err;
20a69341
PM		 7012 }
7013
96518518
PM		 7014 return 0;
7015 default:
49499c3e 7016 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 7017 return -EINVAL;
45d9bcda
PM		 7018 if (len == 0)
7019 return -EINVAL;
49499c3e
PM		 7020 if (reg * NFT_REG32_SIZE + len >
7021 FIELD_SIZEOF(struct nft_regs, data))
45d9bcda 7022 return -ERANGE;
27e6d201 7023
96518518
PM		 7024 if (data != NULL && type != NFT_DATA_VALUE)
7025 return -EINVAL;
7026 return 0;
7027 }
7028}
1ec10212 7029EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 7030
7031static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7032 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7033 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7034 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7035};
7036
7037static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7038 struct nft_data_desc *desc, const struct nlattr *nla)
7039{
664b0f8c 7040 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 7041 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7042 struct nft_chain *chain;
7043 int err;
7044
fceb6435
JB		 7045 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
7046 NULL);
96518518
PM		 7047 if (err < 0)
7048 return err;
7049
7050 if (!tb[NFTA_VERDICT_CODE])
7051 return -EINVAL;
1ca2e170 7052 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 7053
1ca2e170 7054 switch (data->verdict.code) {
e0abdadc 7055 default:
1ca2e170 7056 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 7057 case NF_ACCEPT:
7058 case NF_DROP:
7059 case NF_QUEUE:
7060 break;
7061 default:
7062 return -EINVAL;
7063 }
7064 /* fall through */
96518518
PM		 7065 case NFT_CONTINUE:
7066 case NFT_BREAK:
7067 case NFT_RETURN:
96518518
PM		 7068 break;
7069 case NFT_JUMP:
7070 case NFT_GOTO:
7071 if (!tb[NFTA_VERDICT_CHAIN])
7072 return -EINVAL;
f102d66b
FW		 7073 chain = nft_chain_lookup(ctx->net, ctx->table,
7074 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 7075 if (IS_ERR(chain))
7076 return PTR_ERR(chain);
f323d954 7077 if (nft_is_base_chain(chain))
96518518
PM		 7078 return -EOPNOTSUPP;
7079
96518518 7080 chain->use++;
1ca2e170 7081 data->verdict.chain = chain;
96518518 7082 break;
96518518
PM		 7083 }
7084
4c4ed074 7085 desc->len = sizeof(data->verdict);
96518518
PM		 7086 desc->type = NFT_DATA_VERDICT;
7087 return 0;
7088}
7089
7090static void nft_verdict_uninit(const struct nft_data *data)
7091{
1ca2e170 7092 switch (data->verdict.code) {
96518518
PM		 7093 case NFT_JUMP:
7094 case NFT_GOTO:
1ca2e170 7095 data->verdict.chain->use--;
96518518
PM		 7096 break;
7097 }
7098}
7099
33d5a7b1 7100int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 7101{
7102 struct nlattr *nest;
7103
33d5a7b1 7104 nest = nla_nest_start(skb, type);
96518518
PM		 7105 if (!nest)
7106 goto nla_put_failure;
7107
33d5a7b1 7108 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 7109 goto nla_put_failure;
7110
33d5a7b1 7111 switch (v->code) {
96518518
PM		 7112 case NFT_JUMP:
7113 case NFT_GOTO:
1ca2e170 7114 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 7115 v->chain->name))
96518518
PM		 7116 goto nla_put_failure;
7117 }
7118 nla_nest_end(skb, nest);
7119 return 0;
7120
7121nla_put_failure:
7122 return -1;
7123}
7124
d0a11fc3
PM		 7125static int nft_value_init(const struct nft_ctx *ctx,
7126 struct nft_data *data, unsigned int size,
96518518
PM		 7127 struct nft_data_desc *desc, const struct nlattr *nla)
7128{
7129 unsigned int len;
7130
7131 len = nla_len(nla);
7132 if (len == 0)
7133 return -EINVAL;
d0a11fc3 7134 if (len > size)
96518518
PM		 7135 return -EOVERFLOW;
7136
d0a11fc3 7137 nla_memcpy(data->data, nla, len);
96518518
PM		 7138 desc->type = NFT_DATA_VALUE;
7139 desc->len = len;
7140 return 0;
7141}
7142
7143static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7144 unsigned int len)
7145{
7146 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7147}
7148
7149static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 7150 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 7151 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7152};
7153
7154/**
7155 * nft_data_init - parse nf_tables data netlink attributes
7156 *
7157 * @ctx: context of the expression using the data
7158 * @data: destination struct nft_data
d0a11fc3 7159 * @size: maximum data length
96518518
PM		 7160 * @desc: data description
7161 * @nla: netlink attribute containing data
7162 *
7163 * Parse the netlink data attributes and initialize a struct nft_data.
7164 * The type and length of data are returned in the data description.
7165 *
7166 * The caller can indicate that it only wants to accept data of type
7167 * NFT_DATA_VALUE by passing NULL for the ctx argument.
7168 */
d0a11fc3
PM		 7169int nft_data_init(const struct nft_ctx *ctx,
7170 struct nft_data *data, unsigned int size,
96518518
PM		 7171 struct nft_data_desc *desc, const struct nlattr *nla)
7172{
7173 struct nlattr *tb[NFTA_DATA_MAX + 1];
7174 int err;
7175
fceb6435 7176 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
96518518
PM		 7177 if (err < 0)
7178 return err;
7179
7180 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 7181 return nft_value_init(ctx, data, size, desc,
7182 tb[NFTA_DATA_VALUE]);
96518518
PM		 7183 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
7184 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
7185 return -EINVAL;
7186}
7187EXPORT_SYMBOL_GPL(nft_data_init);
7188
7189/**
59105446 7190 * nft_data_release - release a nft_data item
96518518
PM		 7191 *
7192 * @data: struct nft_data to release
7193 * @type: type of data
7194 *
7195 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7196 * all others need to be released by calling this function.
7197 */
59105446 7198void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 7199{
960bd2c2 7200 if (type < NFT_DATA_VERDICT)
96518518 7201 return;
960bd2c2 7202 switch (type) {
96518518
PM		 7203 case NFT_DATA_VERDICT:
7204 return nft_verdict_uninit(data);
7205 default:
7206 WARN_ON(1);
7207 }
7208}
59105446 7209EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 7210
7211int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
7212 enum nft_data_types type, unsigned int len)
7213{
7214 struct nlattr *nest;
7215 int err;
7216
7217 nest = nla_nest_start(skb, attr);
7218 if (nest == NULL)
7219 return -1;
7220
7221 switch (type) {
7222 case NFT_DATA_VALUE:
7223 err = nft_value_dump(skb, data, len);
7224 break;
7225 case NFT_DATA_VERDICT:
33d5a7b1 7226 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 7227 break;
7228 default:
7229 err = -EINVAL;
7230 WARN_ON(1);
7231 }
7232
7233 nla_nest_end(skb, nest);
7234 return err;
7235}
7236EXPORT_SYMBOL_GPL(nft_data_dump);
7237
5ebe0b0e
PNA		 7238int __nft_release_basechain(struct nft_ctx *ctx)
7239{
7240 struct nft_rule *rule, *nr;
7241
fa5950e4
FW		 7242 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
7243 return 0;
5ebe0b0e 7244
c974a3a3 7245 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 7246 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
7247 list_del(&rule->list);
7248 ctx->chain->use--;
bb7b40ae 7249 nf_tables_rule_release(ctx, rule);
5ebe0b0e 7250 }
1b2470e5 7251 nft_chain_del(ctx->chain);
5ebe0b0e 7252 ctx->table->use--;
43a605f2 7253 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 7254
7255 return 0;
7256}
7257EXPORT_SYMBOL_GPL(__nft_release_basechain);
7258
98319cb9 7259static void __nft_release_tables(struct net *net)
df05ef87 7260{
3b49e2e9 7261 struct nft_flowtable *flowtable, *nf;
df05ef87
PNA		 7262 struct nft_table *table, *nt;
7263 struct nft_chain *chain, *nc;
e5009240 7264 struct nft_object *obj, *ne;
df05ef87
PNA		 7265 struct nft_rule *rule, *nr;
7266 struct nft_set *set, *ns;
7267 struct nft_ctx ctx = {
7268 .net = net,
43a605f2 7269 .family = NFPROTO_NETDEV,
df05ef87
PNA		 7270 };
7271
36596dad 7272 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
98319cb9 7273 ctx.family = table->family;
dd4cbef7 7274
df05ef87 7275 list_for_each_entry(chain, &table->chains, list)
c974a3a3 7276 nf_tables_unregister_hook(net, table, chain);
df05ef87
PNA		 7277 /* No packets are walking on these chains anymore. */
7278 ctx.table = table;
7279 list_for_each_entry(chain, &table->chains, list) {
7280 ctx.chain = chain;
7281 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
7282 list_del(&rule->list);
7283 chain->use--;
bb7b40ae 7284 nf_tables_rule_release(&ctx, rule);
df05ef87
PNA		 7285 }
7286 }
3b49e2e9
PNA		 7287 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
7288 list_del(&flowtable->list);
7289 table->use--;
7290 nf_tables_flowtable_destroy(flowtable);
7291 }
df05ef87
PNA		 7292 list_for_each_entry_safe(set, ns, &table->sets, list) {
7293 list_del(&set->list);
7294 table->use--;
7295 nft_set_destroy(set);
7296 }
e5009240
PNA		 7297 list_for_each_entry_safe(obj, ne, &table->objects, list) {
7298 list_del(&obj->list);
7299 table->use--;
00bfb320 7300 nft_obj_destroy(&ctx, obj);
e5009240 7301 }
df05ef87 7302 list_for_each_entry_safe(chain, nc, &table->chains, list) {
43a605f2 7303 ctx.chain = chain;
1b2470e5 7304 nft_chain_del(chain);
df05ef87 7305 table->use--;
43a605f2 7306 nf_tables_chain_destroy(&ctx);
df05ef87
PNA		 7307 }
7308 list_del(&table->list);
7309 nf_tables_table_destroy(&ctx);
7310 }
7311}
7312
dd4cbef7
PNA		 7313static int __net_init nf_tables_init_net(struct net *net)
7314{
7315 INIT_LIST_HEAD(&net->nft.tables);
7316 INIT_LIST_HEAD(&net->nft.commit_list);
f102d66b 7317 mutex_init(&net->nft.commit_mutex);
dd4cbef7 7318 net->nft.base_seq = 1;
a654de8f
PNA		 7319 net->nft.validate_state = NFT_VALIDATE_SKIP;
7320
dd4cbef7
PNA		 7321 return 0;
7322}
7323
7324static void __net_exit nf_tables_exit_net(struct net *net)
7325{
f102d66b 7326 mutex_lock(&net->nft.commit_mutex);
71ad00c5
FW		 7327 if (!list_empty(&net->nft.commit_list))
7328 __nf_tables_abort(net);
98319cb9 7329 __nft_release_tables(net);
f102d66b 7330 mutex_unlock(&net->nft.commit_mutex);
dd4cbef7 7331 WARN_ON_ONCE(!list_empty(&net->nft.tables));
dd4cbef7
PNA		 7332}
7333
99633ab2
PNA		 7334static struct pernet_operations nf_tables_net_ops = {
7335 .init = nf_tables_init_net,
613d0776 7336 .exit = nf_tables_exit_net,
99633ab2
PNA		 7337};
7338
96518518
PM		 7339static int __init nf_tables_module_init(void)
7340{
7341 int err;
7342
0935d558 7343 spin_lock_init(&nf_tables_destroy_list_lock);
d209df3e
FW		 7344 err = register_pernet_subsys(&nf_tables_net_ops);
7345 if (err < 0)
7346 return err;
7347
7348 err = nft_chain_filter_init();
7349 if (err < 0)
7350 goto err1;
02c7b25e 7351
96518518
PM		 7352 err = nf_tables_core_module_init();
7353 if (err < 0)
d209df3e 7354 goto err2;
96518518 7355
d209df3e 7356 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
96518518 7357 if (err < 0)
d209df3e 7358 goto err3;
96518518 7359
d209df3e
FW		 7360 /* must be last */
7361 err = nfnetlink_subsys_register(&nf_tables_subsys);
7362 if (err < 0)
7363 goto err4;
3b49e2e9 7364
d209df3e
FW		 7365 return err;
7366err4:
7367 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
7368err3:
96518518 7369 nf_tables_core_module_exit();
d209df3e
FW		 7370err2:
7371 nft_chain_filter_fini();
7372err1:
7373 unregister_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 7374 return err;
7375}
7376
7377static void __exit nf_tables_module_exit(void)
7378{
7379 nfnetlink_subsys_unregister(&nf_tables_subsys);
3b49e2e9 7380 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 7381 nft_chain_filter_fini();
71ad00c5 7382 unregister_pernet_subsys(&nf_tables_net_ops);
0935d558 7383 cancel_work_sync(&trans_destroy_work);
1b1bc49c 7384 rcu_barrier();
96518518 7385 nf_tables_core_module_exit();
96518518
PM		 7386}
7387
7388module_init(nf_tables_module_init);
7389module_exit(nf_tables_module_exit);
7390
7391MODULE_LICENSE("GPL");
7392MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
7393MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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