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netfilter: nft_tunnel: add support for geneve opts
[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nf_tables_api.c
CommitLineData
d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
96518518 2/*
20a69341 3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
96518518 4 *
96518518
PM		 5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
6 */
7
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/list.h>
11#include <linux/skbuff.h>
12#include <linux/netlink.h>
1ff75a3e 13#include <linux/vmalloc.h>
0eb71a9d 14#include <linux/rhashtable.h>
96518518
PM		 15#include <linux/netfilter.h>
16#include <linux/netfilter/nfnetlink.h>
17#include <linux/netfilter/nf_tables.h>
3b49e2e9 18#include <net/netfilter/nf_flow_table.h>
96518518
PM		 19#include <net/netfilter/nf_tables_core.h>
20#include <net/netfilter/nf_tables.h>
c9626a2c 21#include <net/netfilter/nf_tables_offload.h>
99633ab2 22#include <net/net_namespace.h>
96518518
PM		 23#include <net/sock.h>
24
9332d27d
FW		 25#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
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
4d44175a
FW		 40static struct rhltable nft_objname_ht;
41
1b2470e5
FW		 42static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
43static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
44static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
45
4d44175a
FW		 46static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
47static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
48static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
49
1b2470e5
FW		 50static const struct rhashtable_params nft_chain_ht_params = {
51 .head_offset = offsetof(struct nft_chain, rhlhead),
52 .key_offset = offsetof(struct nft_chain, name),
53 .hashfn = nft_chain_hash,
54 .obj_hashfn = nft_chain_hash_obj,
55 .obj_cmpfn = nft_chain_hash_cmp,
1b2470e5
FW		 56 .automatic_shrinking = true,
57};
58
4d44175a
FW		 59static const struct rhashtable_params nft_objname_ht_params = {
60 .head_offset = offsetof(struct nft_object, rhlhead),
61 .key_offset = offsetof(struct nft_object, key),
62 .hashfn = nft_objname_hash,
63 .obj_hashfn = nft_objname_hash_obj,
64 .obj_cmpfn = nft_objname_hash_cmp,
65 .automatic_shrinking = true,
66};
67
a654de8f
PNA		 68static void nft_validate_state_update(struct net *net, u8 new_validate_state)
69{
70 switch (net->nft.validate_state) {
71 case NFT_VALIDATE_SKIP:
72 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
73 break;
74 case NFT_VALIDATE_NEED:
75 break;
76 case NFT_VALIDATE_DO:
77 if (new_validate_state == NFT_VALIDATE_NEED)
78 return;
79 }
80
81 net->nft.validate_state = new_validate_state;
82}
0935d558
FW		 83static void nf_tables_trans_destroy_work(struct work_struct *w);
84static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
a654de8f 85
7c95f6d8 86static void nft_ctx_init(struct nft_ctx *ctx,
633c9a84 87 struct net *net,
7c95f6d8
PNA		 88 const struct sk_buff *skb,
89 const struct nlmsghdr *nlh,
36596dad 90 u8 family,
7c95f6d8
PNA		 91 struct nft_table *table,
92 struct nft_chain *chain,
93 const struct nlattr * const *nla)
94{
633c9a84 95 ctx->net = net;
36596dad 96 ctx->family = family;
26b2f552 97 ctx->level = 0;
128ad332
PNA		 98 ctx->table = table;
99 ctx->chain = chain;
100 ctx->nla = nla;
101 ctx->portid = NETLINK_CB(skb).portid;
102 ctx->report = nlmsg_report(nlh);
c9626a2c 103 ctx->flags = nlh->nlmsg_flags;
128ad332 104 ctx->seq = nlh->nlmsg_seq;
7c95f6d8
PNA		 105}
106
8411b644
PNA		 107static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
108 int msg_type, u32 size, gfp_t gfp)
1081d11b
PNA		 109{
110 struct nft_trans *trans;
111
8411b644 112 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
1081d11b
PNA		 113 if (trans == NULL)
114 return NULL;
115
b380e5c7 116 trans->msg_type = msg_type;
1081d11b
PNA		 117 trans->ctx = *ctx;
118
119 return trans;
120}
121
8411b644
PNA		 122static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
123 int msg_type, u32 size)
124{
125 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
126}
127
1081d11b
PNA		 128static void nft_trans_destroy(struct nft_trans *trans)
129{
130 list_del(&trans->list);
131 kfree(trans);
132}
133
f6ac8585
PNA		 134static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
135{
136 struct net *net = ctx->net;
137 struct nft_trans *trans;
138
139 if (!nft_set_is_anonymous(set))
140 return;
141
142 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
6a0a8d10
PNA		 143 switch (trans->msg_type) {
144 case NFT_MSG_NEWSET:
145 if (nft_trans_set(trans) == set)
146 nft_trans_set_bound(trans) = true;
147 break;
148 case NFT_MSG_NEWSETELEM:
149 if (nft_trans_elem_set(trans) == set)
150 nft_trans_elem_set_bound(trans) = true;
f6ac8585
PNA		 151 break;
152 }
153 }
154}
155
d54725cd
PNA		 156static int nft_netdev_register_hooks(struct net *net,
157 struct list_head *hook_list)
158{
159 struct nft_hook *hook;
160 int err, j;
161
162 j = 0;
163 list_for_each_entry(hook, hook_list, list) {
164 err = nf_register_net_hook(net, &hook->ops);
165 if (err < 0)
166 goto err_register;
167
168 j++;
169 }
170 return 0;
171
172err_register:
173 list_for_each_entry(hook, hook_list, list) {
174 if (j-- <= 0)
175 break;
176
177 nf_unregister_net_hook(net, &hook->ops);
178 }
179 return err;
180}
181
182static void nft_netdev_unregister_hooks(struct net *net,
183 struct list_head *hook_list)
184{
185 struct nft_hook *hook;
186
187 list_for_each_entry(hook, hook_list, list)
188 nf_unregister_net_hook(net, &hook->ops);
189}
190
191static int nft_register_basechain_hooks(struct net *net, int family,
192 struct nft_base_chain *basechain)
193{
194 if (family == NFPROTO_NETDEV)
195 return nft_netdev_register_hooks(net, &basechain->hook_list);
196
197 return nf_register_net_hook(net, &basechain->ops);
198}
199
200static void nft_unregister_basechain_hooks(struct net *net, int family,
201 struct nft_base_chain *basechain)
202{
203 if (family == NFPROTO_NETDEV)
204 nft_netdev_unregister_hooks(net, &basechain->hook_list);
205 else
206 nf_unregister_net_hook(net, &basechain->ops);
207}
208
c974a3a3
PNA		 209static int nf_tables_register_hook(struct net *net,
210 const struct nft_table *table,
211 struct nft_chain *chain)
d8ee8f7c 212{
d54725cd 213 struct nft_base_chain *basechain;
a37061a6 214 const struct nf_hook_ops *ops;
ae6153b5 215
d8ee8f7c 216 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 217 !nft_is_base_chain(chain))
d8ee8f7c
PNA		 218 return 0;
219
4e25ceb8
FW		 220 basechain = nft_base_chain(chain);
221 ops = &basechain->ops;
ae6153b5 222
4e25ceb8
FW		 223 if (basechain->type->ops_register)
224 return basechain->type->ops_register(net, ops);
225
d54725cd 226 return nft_register_basechain_hooks(net, table->family, basechain);
d8ee8f7c
PNA		 227}
228
c974a3a3
PNA		 229static void nf_tables_unregister_hook(struct net *net,
230 const struct nft_table *table,
231 struct nft_chain *chain)
c5598794 232{
d54725cd 233 struct nft_base_chain *basechain;
4e25ceb8
FW		 234 const struct nf_hook_ops *ops;
235
d8ee8f7c 236 if (table->flags & NFT_TABLE_F_DORMANT ||
f323d954 237 !nft_is_base_chain(chain))
d8ee8f7c 238 return;
4e25ceb8
FW		 239 basechain = nft_base_chain(chain);
240 ops = &basechain->ops;
d8ee8f7c 241
4e25ceb8
FW		 242 if (basechain->type->ops_unregister)
243 return basechain->type->ops_unregister(net, ops);
244
d54725cd 245 nft_unregister_basechain_hooks(net, table->family, basechain);
c5598794
AB		 246}
247
ee01d542
AB		 248static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
249{
250 struct nft_trans *trans;
251
252 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
253 if (trans == NULL)
254 return -ENOMEM;
255
256 if (msg_type == NFT_MSG_NEWTABLE)
f2a6d766 257 nft_activate_next(ctx->net, ctx->table);
ee01d542
AB		 258
259 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
260 return 0;
261}
262
263static int nft_deltable(struct nft_ctx *ctx)
264{
265 int err;
266
267 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
268 if (err < 0)
269 return err;
270
f2a6d766 271 nft_deactivate_next(ctx->net, ctx->table);
ee01d542
AB		 272 return err;
273}
274
66293c46 275static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
ee01d542
AB		 276{
277 struct nft_trans *trans;
278
279 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
280 if (trans == NULL)
66293c46 281 return ERR_PTR(-ENOMEM);
ee01d542
AB		 282
283 if (msg_type == NFT_MSG_NEWCHAIN)
664b0f8c 284 nft_activate_next(ctx->net, ctx->chain);
ee01d542
AB		 285
286 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
66293c46 287 return trans;
ee01d542
AB		 288}
289
290static int nft_delchain(struct nft_ctx *ctx)
291{
66293c46 292 struct nft_trans *trans;
ee01d542 293
66293c46
FW		 294 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
295 if (IS_ERR(trans))
296 return PTR_ERR(trans);
ee01d542
AB		 297
298 ctx->table->use--;
664b0f8c 299 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542 300
66293c46 301 return 0;
ee01d542
AB		 302}
303
bb7b40ae
PNA		 304static void nft_rule_expr_activate(const struct nft_ctx *ctx,
305 struct nft_rule *rule)
306{
307 struct nft_expr *expr;
308
309 expr = nft_expr_first(rule);
310 while (expr != nft_expr_last(rule) && expr->ops) {
311 if (expr->ops->activate)
312 expr->ops->activate(ctx, expr);
313
314 expr = nft_expr_next(expr);
315 }
316}
317
318static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
f6ac8585
PNA		 319 struct nft_rule *rule,
320 enum nft_trans_phase phase)
bb7b40ae
PNA		 321{
322 struct nft_expr *expr;
323
324 expr = nft_expr_first(rule);
325 while (expr != nft_expr_last(rule) && expr->ops) {
326 if (expr->ops->deactivate)
f6ac8585 327 expr->ops->deactivate(ctx, expr, phase);
bb7b40ae
PNA		 328
329 expr = nft_expr_next(expr);
330 }
331}
332
ee01d542
AB		 333static int
334nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
335{
336 /* You cannot delete the same rule twice */
889f7ee7
PNA		 337 if (nft_is_active_next(ctx->net, rule)) {
338 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 339 ctx->chain->use--;
340 return 0;
341 }
342 return -ENOENT;
343}
344
345static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
346 struct nft_rule *rule)
347{
348 struct nft_trans *trans;
349
350 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
351 if (trans == NULL)
352 return NULL;
353
1a94e38d
PNA		 354 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
355 nft_trans_rule_id(trans) =
356 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
357 }
ee01d542
AB		 358 nft_trans_rule(trans) = rule;
359 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
360
361 return trans;
362}
363
364static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
365{
63b48c73 366 struct nft_flow_rule *flow;
ee01d542
AB		 367 struct nft_trans *trans;
368 int err;
369
370 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
371 if (trans == NULL)
372 return -ENOMEM;
373
63b48c73
PNA		 374 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
375 flow = nft_flow_rule_create(ctx->net, rule);
376 if (IS_ERR(flow)) {
377 nft_trans_destroy(trans);
378 return PTR_ERR(flow);
379 }
380
381 nft_trans_flow_rule(trans) = flow;
382 }
383
ee01d542
AB		 384 err = nf_tables_delrule_deactivate(ctx, rule);
385 if (err < 0) {
386 nft_trans_destroy(trans);
387 return err;
388 }
f6ac8585 389 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
ee01d542
AB		 390
391 return 0;
392}
393
394static int nft_delrule_by_chain(struct nft_ctx *ctx)
395{
396 struct nft_rule *rule;
397 int err;
398
399 list_for_each_entry(rule, &ctx->chain->rules, list) {
23b7ca4f
PNA		 400 if (!nft_is_active_next(ctx->net, rule))
401 continue;
402
ee01d542
AB		 403 err = nft_delrule(ctx, rule);
404 if (err < 0)
405 return err;
406 }
407 return 0;
408}
409
cd5125d8 410static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
ee01d542
AB		 411 struct nft_set *set)
412{
413 struct nft_trans *trans;
414
415 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
416 if (trans == NULL)
417 return -ENOMEM;
418
419 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
420 nft_trans_set_id(trans) =
421 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 422 nft_activate_next(ctx->net, set);
ee01d542
AB		 423 }
424 nft_trans_set(trans) = set;
425 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
426
427 return 0;
428}
429
cd5125d8 430static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
ee01d542
AB		 431{
432 int err;
433
434 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
435 if (err < 0)
436 return err;
437
37a9cc52 438 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 439 ctx->table->use--;
440
441 return err;
442}
443
e5009240
PNA		 444static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
445 struct nft_object *obj)
446{
447 struct nft_trans *trans;
448
449 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
450 if (trans == NULL)
451 return -ENOMEM;
452
453 if (msg_type == NFT_MSG_NEWOBJ)
454 nft_activate_next(ctx->net, obj);
455
456 nft_trans_obj(trans) = obj;
457 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
458
459 return 0;
460}
461
462static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
463{
464 int err;
465
466 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
467 if (err < 0)
468 return err;
469
470 nft_deactivate_next(ctx->net, obj);
471 ctx->table->use--;
472
473 return err;
474}
475
3b49e2e9
PNA		 476static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
477 struct nft_flowtable *flowtable)
478{
479 struct nft_trans *trans;
480
481 trans = nft_trans_alloc(ctx, msg_type,
482 sizeof(struct nft_trans_flowtable));
483 if (trans == NULL)
484 return -ENOMEM;
485
486 if (msg_type == NFT_MSG_NEWFLOWTABLE)
487 nft_activate_next(ctx->net, flowtable);
488
489 nft_trans_flowtable(trans) = flowtable;
490 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
491
492 return 0;
493}
494
495static int nft_delflowtable(struct nft_ctx *ctx,
496 struct nft_flowtable *flowtable)
497{
498 int err;
499
500 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
501 if (err < 0)
502 return err;
503
504 nft_deactivate_next(ctx->net, flowtable);
505 ctx->table->use--;
506
507 return err;
508}
509
96518518
PM		 510/*
511 * Tables
512 */
513
36596dad 514static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 515 const struct nlattr *nla,
36596dad 516 u8 family, u8 genmask)
96518518
PM		 517{
518 struct nft_table *table;
519
cac20fcd
PNA		 520 if (nla == NULL)
521 return ERR_PTR(-EINVAL);
522
d9adf22a 523 list_for_each_entry_rcu(table, &net->nft.tables, list) {
f2a6d766 524 if (!nla_strcmp(nla, table->name) &&
98319cb9 525 table->family == family &&
f2a6d766 526 nft_active_genmask(table, genmask))
96518518
PM		 527 return table;
528 }
cac20fcd
PNA		 529
530 return ERR_PTR(-ENOENT);
96518518
PM		 531}
532
3ecbfd65
HS		 533static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
534 const struct nlattr *nla,
535 u8 genmask)
536{
537 struct nft_table *table;
538
539 list_for_each_entry(table, &net->nft.tables, list) {
540 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
541 nft_active_genmask(table, genmask))
542 return table;
543 }
3ecbfd65
HS		 544
545 return ERR_PTR(-ENOENT);
546}
547
96518518
PM		 548static inline u64 nf_tables_alloc_handle(struct nft_table *table)
549{
550 return ++table->hgenerator;
551}
552
32537e91 553static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 554
82603549
PNA		 555static const struct nft_chain_type *
556__nft_chain_type_get(u8 family, enum nft_chain_types type)
557{
558 if (family >= NFPROTO_NUMPROTO ||
559 type >= NFT_CHAIN_T_MAX)
560 return NULL;
561
562 return chain_type[family][type];
563}
564
32537e91 565static const struct nft_chain_type *
1ea26cca 566__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c 567{
82603549 568 const struct nft_chain_type *type;
9370761c
PNA		 569 int i;
570
baae3e62 571 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
82603549
PNA		 572 type = __nft_chain_type_get(family, i);
573 if (!type)
574 continue;
575 if (!nla_strcmp(nla, type->name))
576 return type;
9370761c 577 }
baae3e62 578 return NULL;
9370761c
PNA		 579}
580
eb014de4
PNA		 581struct nft_module_request {
582 struct list_head list;
583 char module[MODULE_NAME_LEN];
584 bool done;
585};
586
452238e8 587#ifdef CONFIG_MODULES
eb014de4 588static int nft_request_module(struct net *net, const char *fmt, ...)
452238e8
FW		 589{
590 char module_name[MODULE_NAME_LEN];
eb014de4 591 struct nft_module_request *req;
452238e8
FW		 592 va_list args;
593 int ret;
594
452238e8
FW		 595 va_start(args, fmt);
596 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
597 va_end(args);
9332d27d 598 if (ret >= MODULE_NAME_LEN)
eb014de4 599 return 0;
452238e8 600
eb014de4
PNA		 601 list_for_each_entry(req, &net->nft.module_list, list) {
602 if (!strcmp(req->module, module_name)) {
603 if (req->done)
604 return 0;
ec7470b8 605
eb014de4
PNA		 606 /* A request to load this module already exists. */
607 return -EAGAIN;
608 }
609 }
610
611 req = kmalloc(sizeof(*req), GFP_KERNEL);
612 if (!req)
613 return -ENOMEM;
614
615 req->done = false;
616 strlcpy(req->module, module_name, MODULE_NAME_LEN);
617 list_add_tail(&req->list, &net->nft.module_list);
618
619 return -EAGAIN;
452238e8
FW		 620}
621#endif
622
f102d66b
FW		 623static void lockdep_nfnl_nft_mutex_not_held(void)
624{
625#ifdef CONFIG_PROVE_LOCKING
626 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
627#endif
628}
629
32537e91 630static const struct nft_chain_type *
452238e8
FW		 631nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
632 u8 family, bool autoload)
9370761c 633{
32537e91 634 const struct nft_chain_type *type;
9370761c 635
1ea26cca 636 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 637 if (type != NULL)
638 return type;
f102d66b
FW		 639
640 lockdep_nfnl_nft_mutex_not_held();
9370761c 641#ifdef CONFIG_MODULES
93b0806f 642 if (autoload) {
eb014de4
PNA		 643 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
644 nla_len(nla),
645 (const char *)nla_data(nla)) == -EAGAIN)
93b0806f 646 return ERR_PTR(-EAGAIN);
9370761c
PNA		 647 }
648#endif
93b0806f 649 return ERR_PTR(-ENOENT);
9370761c
PNA		 650}
651
96518518 652static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 653 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
654 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 655 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 656 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
96518518
PM		 657};
658
84d7fce6
PNA		 659static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
660 u32 portid, u32 seq, int event, u32 flags,
661 int family, const struct nft_table *table)
96518518
PM		 662{
663 struct nlmsghdr *nlh;
664 struct nfgenmsg *nfmsg;
665
dedb67c4 666 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 667 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
668 if (nlh == NULL)
669 goto nla_put_failure;
670
671 nfmsg = nlmsg_data(nlh);
672 nfmsg->nfgen_family = family;
673 nfmsg->version = NFNETLINK_V0;
84d7fce6 674 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 675
9ddf6323 676 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768 677 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
3ecbfd65
HS		 678 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
679 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
680 NFTA_TABLE_PAD))
96518518
PM		 681 goto nla_put_failure;
682
053c095a
JB		 683 nlmsg_end(skb, nlh);
684 return 0;
96518518
PM		 685
686nla_put_failure:
687 nlmsg_trim(skb, nlh);
688 return -1;
689}
690
25e94a99 691static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 692{
693 struct sk_buff *skb;
96518518
PM		 694 int err;
695
128ad332
PNA		 696 if (!ctx->report &&
697 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 698 return;
96518518 699
96518518
PM		 700 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
701 if (skb == NULL)
702 goto err;
703
84d7fce6 704 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 705 event, 0, ctx->family, ctx->table);
96518518
PM		 706 if (err < 0) {
707 kfree_skb(skb);
708 goto err;
709 }
710
25e94a99
PNA		 711 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
712 ctx->report, GFP_KERNEL);
713 return;
96518518 714err:
25e94a99 715 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 716}
717
718static int nf_tables_dump_tables(struct sk_buff *skb,
719 struct netlink_callback *cb)
720{
721 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 722 const struct nft_table *table;
723 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 724 struct net *net = sock_net(skb->sk);
96518518
PM		 725 int family = nfmsg->nfgen_family;
726
e688a7f8 727 rcu_read_lock();
38e029f1
PNA		 728 cb->seq = net->nft.base_seq;
729
36596dad 730 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 731 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 732 continue;
733
36596dad
PNA		 734 if (idx < s_idx)
735 goto cont;
736 if (idx > s_idx)
737 memset(&cb->args[1], 0,
738 sizeof(cb->args) - sizeof(cb->args[0]));
739 if (!nft_is_active(net, table))
740 continue;
741 if (nf_tables_fill_table_info(skb, net,
742 NETLINK_CB(cb->skb).portid,
743 cb->nlh->nlmsg_seq,
744 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 745 table->family, table) < 0)
36596dad
PNA		 746 goto done;
747
748 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 749cont:
36596dad 750 idx++;
96518518
PM		 751 }
752done:
e688a7f8 753 rcu_read_unlock();
96518518
PM		 754 cb->args[0] = idx;
755 return skb->len;
756}
757
d9adf22a
FW		 758static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
759 const struct nlmsghdr *nlh,
760 struct netlink_dump_control *c)
761{
762 int err;
763
764 if (!try_module_get(THIS_MODULE))
765 return -EINVAL;
766
767 rcu_read_unlock();
768 err = netlink_dump_start(nlsk, skb, nlh, c);
769 rcu_read_lock();
770 module_put(THIS_MODULE);
771
772 return err;
773}
774
775/* called with rcu_read_lock held */
7b8002a1
PNA		 776static int nf_tables_gettable(struct net *net, struct sock *nlsk,
777 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 778 const struct nlattr * const nla[],
779 struct netlink_ext_ack *extack)
96518518
PM		 780{
781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 782 u8 genmask = nft_genmask_cur(net);
96518518
PM		 783 const struct nft_table *table;
784 struct sk_buff *skb2;
785 int family = nfmsg->nfgen_family;
786 int err;
787
788 if (nlh->nlmsg_flags & NLM_F_DUMP) {
789 struct netlink_dump_control c = {
790 .dump = nf_tables_dump_tables,
d9adf22a 791 .module = THIS_MODULE,
96518518 792 };
d9adf22a
FW		 793
794 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 795 }
796
cac20fcd 797 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
36dd1bcc
PNA		 798 if (IS_ERR(table)) {
799 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 800 return PTR_ERR(table);
36dd1bcc 801 }
96518518 802
d9adf22a 803 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 804 if (!skb2)
805 return -ENOMEM;
806
84d7fce6 807 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 808 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
809 family, table);
810 if (err < 0)
811 goto err;
812
813 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
814
815err:
816 kfree_skb(skb2);
817 return err;
818}
819
c9c17211 820static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 821{
822 struct nft_chain *chain;
823 u32 i = 0;
824
825 list_for_each_entry(chain, &table->chains, list) {
826 if (!nft_is_active_next(net, chain))
827 continue;
f323d954 828 if (!nft_is_base_chain(chain))
10435c11
F		 829 continue;
830
831 if (cnt && i++ == cnt)
832 break;
833
d54725cd
PNA		 834 nft_unregister_basechain_hooks(net, table->family,
835 nft_base_chain(chain));
10435c11
F		 836 }
837}
838
c9c17211 839static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 840{
841 struct nft_chain *chain;
842 int err, i = 0;
843
844 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 845 if (!nft_is_active_next(net, chain))
846 continue;
f323d954 847 if (!nft_is_base_chain(chain))
d2012975
PNA		 848 continue;
849
d54725cd
PNA		 850 err = nft_register_basechain_hooks(net, table->family,
851 nft_base_chain(chain));
9ddf6323 852 if (err < 0)
d54725cd 853 goto err_register_hooks;
9ddf6323
PNA		 854
855 i++;
856 }
857 return 0;
d54725cd
PNA		 858
859err_register_hooks:
10435c11 860 if (i)
c9c17211 861 nft_table_disable(net, table, i);
9ddf6323
PNA		 862 return err;
863}
864
c9c17211 865static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 866{
c9c17211 867 nft_table_disable(net, table, 0);
9ddf6323
PNA		 868}
869
e1aaca93 870static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 871{
55dd6f93 872 struct nft_trans *trans;
e1aaca93 873 u32 flags;
55dd6f93 874 int ret = 0;
9ddf6323 875
e1aaca93
PNA		 876 if (!ctx->nla[NFTA_TABLE_FLAGS])
877 return 0;
9ddf6323 878
e1aaca93
PNA		 879 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
880 if (flags & ~NFT_TABLE_F_DORMANT)
881 return -EINVAL;
882
63283dd2
PNA		 883 if (flags == ctx->table->flags)
884 return 0;
885
55dd6f93
PNA		 886 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
887 sizeof(struct nft_trans_table));
888 if (trans == NULL)
889 return -ENOMEM;
9ddf6323 890
e1aaca93
PNA		 891 if ((flags & NFT_TABLE_F_DORMANT) &&
892 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 893 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 894 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
895 ctx->table->flags & NFT_TABLE_F_DORMANT) {
c9c17211 896 ret = nf_tables_table_enable(ctx->net, ctx->table);
55dd6f93 897 if (ret >= 0) {
e1aaca93 898 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 899 nft_trans_table_enable(trans) = true;
9ddf6323 900 }
9ddf6323 901 }
e1aaca93
PNA		 902 if (ret < 0)
903 goto err;
9ddf6323 904
55dd6f93
PNA		 905 nft_trans_table_update(trans) = true;
906 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
907 return 0;
9ddf6323 908err:
55dd6f93 909 nft_trans_destroy(trans);
9ddf6323
PNA		 910 return ret;
911}
912
1b2470e5
FW		 913static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
914{
915 const char *name = data;
916
917 return jhash(name, strlen(name), seed);
918}
919
920static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
921{
922 const struct nft_chain *chain = data;
923
924 return nft_chain_hash(chain->name, 0, seed);
925}
926
927static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
928 const void *ptr)
929{
930 const struct nft_chain *chain = ptr;
931 const char *name = arg->key;
932
933 return strcmp(chain->name, name);
934}
935
4d44175a
FW		 936static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
937{
938 const struct nft_object_hash_key *k = data;
939
940 seed ^= hash_ptr(k->table, 32);
941
942 return jhash(k->name, strlen(k->name), seed);
943}
944
945static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
946{
947 const struct nft_object *obj = data;
948
949 return nft_objname_hash(&obj->key, 0, seed);
950}
951
952static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
953 const void *ptr)
954{
955 const struct nft_object_hash_key *k = arg->key;
956 const struct nft_object *obj = ptr;
957
958 if (obj->key.table != k->table)
959 return -1;
960
961 return strcmp(obj->key.name, k->name);
962}
963
633c9a84
PNA		 964static int nf_tables_newtable(struct net *net, struct sock *nlsk,
965 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 966 const struct nlattr * const nla[],
967 struct netlink_ext_ack *extack)
96518518
PM		 968{
969 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 970 u8 genmask = nft_genmask_next(net);
96518518 971 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 972 const struct nlattr *attr;
973 struct nft_table *table;
c5c1f975 974 u32 flags = 0;
e1aaca93 975 struct nft_ctx ctx;
55dd6f93 976 int err;
96518518 977
f102d66b 978 lockdep_assert_held(&net->nft.commit_mutex);
36dd1bcc
PNA		 979 attr = nla[NFTA_TABLE_NAME];
980 table = nft_table_lookup(net, attr, family, genmask);
96518518
PM		 981 if (IS_ERR(table)) {
982 if (PTR_ERR(table) != -ENOENT)
983 return PTR_ERR(table);
1a28ad74 984 } else {
36dd1bcc
PNA		 985 if (nlh->nlmsg_flags & NLM_F_EXCL) {
986 NL_SET_BAD_ATTR(extack, attr);
96518518 987 return -EEXIST;
36dd1bcc 988 }
96518518
PM		 989 if (nlh->nlmsg_flags & NLM_F_REPLACE)
990 return -EOPNOTSUPP;
e1aaca93 991
98319cb9 992 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e1aaca93 993 return nf_tables_updtable(&ctx);
96518518
PM		 994 }
995
c5c1f975
PM		 996 if (nla[NFTA_TABLE_FLAGS]) {
997 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
998 if (flags & ~NFT_TABLE_F_DORMANT)
999 return -EINVAL;
1000 }
1001
ffdb210e 1002 err = -ENOMEM;
1cae565e 1003 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 1004 if (table == NULL)
98319cb9 1005 goto err_kzalloc;
96518518 1006
36dd1bcc 1007 table->name = nla_strdup(attr, GFP_KERNEL);
e46abbcc 1008 if (table->name == NULL)
98319cb9 1009 goto err_strdup;
e46abbcc 1010
1b2470e5
FW		 1011 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1012 if (err)
1013 goto err_chain_ht;
1014
96518518 1015 INIT_LIST_HEAD(&table->chains);
20a69341 1016 INIT_LIST_HEAD(&table->sets);
e5009240 1017 INIT_LIST_HEAD(&table->objects);
3b49e2e9 1018 INIT_LIST_HEAD(&table->flowtables);
98319cb9 1019 table->family = family;
c5c1f975 1020 table->flags = flags;
3ecbfd65 1021 table->handle = ++table_handle;
9ddf6323 1022
98319cb9 1023 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
55dd6f93 1024 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 1025 if (err < 0)
98319cb9 1026 goto err_trans;
ffdb210e 1027
36596dad 1028 list_add_tail_rcu(&table->list, &net->nft.tables);
96518518 1029 return 0;
98319cb9 1030err_trans:
1b2470e5
FW		 1031 rhltable_destroy(&table->chains_ht);
1032err_chain_ht:
e46abbcc 1033 kfree(table->name);
98319cb9 1034err_strdup:
ffdb210e 1035 kfree(table);
98319cb9 1036err_kzalloc:
ffdb210e 1037 return err;
96518518
PM		 1038}
1039
b9ac12ef
AB		 1040static int nft_flush_table(struct nft_ctx *ctx)
1041{
3b49e2e9 1042 struct nft_flowtable *flowtable, *nft;
b9ac12ef 1043 struct nft_chain *chain, *nc;
e5009240 1044 struct nft_object *obj, *ne;
b9ac12ef 1045 struct nft_set *set, *ns;
3b49e2e9 1046 int err;
b9ac12ef 1047
a2f18db0 1048 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 1049 if (!nft_is_active_next(ctx->net, chain))
1050 continue;
1051
b9ac12ef
AB		 1052 ctx->chain = chain;
1053
1054 err = nft_delrule_by_chain(ctx);
1055 if (err < 0)
1056 goto out;
b9ac12ef
AB		 1057 }
1058
1059 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 1060 if (!nft_is_active_next(ctx->net, set))
1061 continue;
1062
408070d6 1063 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 1064 !list_empty(&set->bindings))
1065 continue;
1066
1067 err = nft_delset(ctx, set);
1068 if (err < 0)
1069 goto out;
1070 }
1071
3b49e2e9 1072 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
335178d5
FW		 1073 if (!nft_is_active_next(ctx->net, flowtable))
1074 continue;
1075
3b49e2e9
PNA		 1076 err = nft_delflowtable(ctx, flowtable);
1077 if (err < 0)
1078 goto out;
1079 }
1080
e5009240 1081 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
335178d5
FW		 1082 if (!nft_is_active_next(ctx->net, obj))
1083 continue;
1084
e5009240
PNA		 1085 err = nft_delobj(ctx, obj);
1086 if (err < 0)
1087 goto out;
1088 }
1089
a2f18db0 1090 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 1091 if (!nft_is_active_next(ctx->net, chain))
1092 continue;
1093
a2f18db0
PNA		 1094 ctx->chain = chain;
1095
1096 err = nft_delchain(ctx);
1097 if (err < 0)
1098 goto out;
1099 }
1100
b9ac12ef
AB		 1101 err = nft_deltable(ctx);
1102out:
1103 return err;
1104}
1105
1106static int nft_flush(struct nft_ctx *ctx, int family)
1107{
b9ac12ef
AB		 1108 struct nft_table *table, *nt;
1109 const struct nlattr * const *nla = ctx->nla;
1110 int err = 0;
1111
36596dad 1112 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
98319cb9 1113 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 1114 continue;
1115
98319cb9 1116 ctx->family = table->family;
f2a6d766 1117
36596dad
PNA		 1118 if (!nft_is_active_next(ctx->net, table))
1119 continue;
b9ac12ef 1120
36596dad
PNA		 1121 if (nla[NFTA_TABLE_NAME] &&
1122 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1123 continue;
b9ac12ef 1124
36596dad
PNA		 1125 ctx->table = table;
1126
1127 err = nft_flush_table(ctx);
1128 if (err < 0)
1129 goto out;
b9ac12ef
AB		 1130 }
1131out:
1132 return err;
1133}
1134
633c9a84
PNA		 1135static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1136 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1137 const struct nlattr * const nla[],
1138 struct netlink_ext_ack *extack)
96518518
PM		 1139{
1140 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1141 u8 genmask = nft_genmask_next(net);
ee01d542 1142 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 1143 const struct nlattr *attr;
1144 struct nft_table *table;
55dd6f93 1145 struct nft_ctx ctx;
96518518 1146
36596dad 1147 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 1148 if (family == AF_UNSPEC ||
1149 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 1150 return nft_flush(&ctx, family);
1151
36dd1bcc
PNA		 1152 if (nla[NFTA_TABLE_HANDLE]) {
1153 attr = nla[NFTA_TABLE_HANDLE];
1154 table = nft_table_lookup_byhandle(net, attr, genmask);
1155 } else {
1156 attr = nla[NFTA_TABLE_NAME];
1157 table = nft_table_lookup(net, attr, family, genmask);
1158 }
3ecbfd65 1159
36dd1bcc
PNA		 1160 if (IS_ERR(table)) {
1161 NL_SET_BAD_ATTR(extack, attr);
96518518 1162 return PTR_ERR(table);
36dd1bcc 1163 }
96518518 1164
a8278400
PNA		 1165 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1166 table->use > 0)
1167 return -EBUSY;
1168
98319cb9 1169 ctx.family = family;
b9ac12ef 1170 ctx.table = table;
55dd6f93 1171
b9ac12ef 1172 return nft_flush_table(&ctx);
96518518
PM		 1173}
1174
55dd6f93
PNA		 1175static void nf_tables_table_destroy(struct nft_ctx *ctx)
1176{
fa5950e4
FW		 1177 if (WARN_ON(ctx->table->use > 0))
1178 return;
4fefee57 1179
1b2470e5 1180 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1181 kfree(ctx->table->name);
55dd6f93 1182 kfree(ctx->table);
55dd6f93
PNA		 1183}
1184
cc07eeb0 1185void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1186{
96518518 1187 nfnl_lock(NFNL_SUBSYS_NFTABLES);
82603549 1188 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
cc07eeb0
PNA		 1189 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1190 return;
96518518 1191 }
9370761c 1192 chain_type[ctype->family][ctype->type] = ctype;
96518518 1193 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1194}
9370761c 1195EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1196
32537e91 1197void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1198{
96518518 1199 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1200 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1201 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1202}
9370761c 1203EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1204
1205/*
1206 * Chains
1207 */
1208
1209static struct nft_chain *
cac20fcd 1210nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1211{
1212 struct nft_chain *chain;
1213
1214 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1215 if (chain->handle == handle &&
1216 nft_active_genmask(chain, genmask))
96518518
PM		 1217 return chain;
1218 }
1219
1220 return ERR_PTR(-ENOENT);
1221}
1222
4d44175a 1223static bool lockdep_commit_lock_is_held(const struct net *net)
f102d66b
FW		 1224{
1225#ifdef CONFIG_PROVE_LOCKING
1226 return lockdep_is_held(&net->nft.commit_mutex);
1227#else
1228 return true;
1229#endif
1230}
1231
1232static struct nft_chain *nft_chain_lookup(struct net *net,
1233 struct nft_table *table,
cac20fcd 1234 const struct nlattr *nla, u8 genmask)
96518518 1235{
1b2470e5
FW		 1236 char search[NFT_CHAIN_MAXNAMELEN + 1];
1237 struct rhlist_head *tmp, *list;
96518518
PM		 1238 struct nft_chain *chain;
1239
1240 if (nla == NULL)
1241 return ERR_PTR(-EINVAL);
1242
1b2470e5 1243 nla_strlcpy(search, nla, sizeof(search));
96518518 1244
1b2470e5 1245 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1246 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1247
1248 chain = ERR_PTR(-ENOENT);
1249 rcu_read_lock();
1250 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1251 if (!list)
1252 goto out_unlock;
1253
1254 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1255 if (nft_active_genmask(chain, genmask))
1256 goto out_unlock;
1257 }
1258 chain = ERR_PTR(-ENOENT);
1259out_unlock:
1260 rcu_read_unlock();
1261 return chain;
96518518
PM		 1262}
1263
1264static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1265 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1266 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1267 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1268 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1269 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1270 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1271 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
9332d27d
FW		 1272 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1273 .len = NFT_MODULE_AUTOLOAD_LIMIT },
0ca743a5 1274 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
c9626a2c 1275 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
96518518
PM		 1276};
1277
1278static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1279 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1280 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1281 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1282 .len = IFNAMSIZ - 1 },
96518518
PM		 1283};
1284
0ca743a5
PNA		 1285static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1286{
1287 struct nft_stats *cpu_stats, total;
1288 struct nlattr *nest;
ce355e20
ED		 1289 unsigned int seq;
1290 u64 pkts, bytes;
0ca743a5
PNA		 1291 int cpu;
1292
edbd82c5
FW		 1293 if (!stats)
1294 return 0;
1295
0ca743a5
PNA		 1296 memset(&total, 0, sizeof(total));
1297 for_each_possible_cpu(cpu) {
1298 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 1299 do {
1300 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1301 pkts = cpu_stats->pkts;
1302 bytes = cpu_stats->bytes;
1303 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1304 total.pkts += pkts;
1305 total.bytes += bytes;
0ca743a5 1306 }
ae0be8de 1307 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
0ca743a5
PNA		 1308 if (nest == NULL)
1309 goto nla_put_failure;
1310
b46f6ded
ND		 1311 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1312 NFTA_COUNTER_PAD) ||
1313 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1314 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1315 goto nla_put_failure;
1316
1317 nla_nest_end(skb, nest);
1318 return 0;
1319
1320nla_put_failure:
1321 return -ENOSPC;
1322}
1323
d54725cd
PNA		 1324static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1325 const struct nft_base_chain *basechain)
1326{
1327 const struct nf_hook_ops *ops = &basechain->ops;
1328 struct nft_hook *hook, *first = NULL;
1329 struct nlattr *nest, *nest_devs;
1330 int n = 0;
1331
1332 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1333 if (nest == NULL)
1334 goto nla_put_failure;
1335 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1336 goto nla_put_failure;
1337 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1338 goto nla_put_failure;
1339
1340 if (family == NFPROTO_NETDEV) {
1341 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1342 list_for_each_entry(hook, &basechain->hook_list, list) {
1343 if (!first)
1344 first = hook;
1345
1346 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1347 hook->ops.dev->name))
1348 goto nla_put_failure;
1349 n++;
1350 }
1351 nla_nest_end(skb, nest_devs);
1352
1353 if (n == 1 &&
1354 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1355 goto nla_put_failure;
1356 }
1357 nla_nest_end(skb, nest);
1358
1359 return 0;
1360nla_put_failure:
1361 return -1;
1362}
1363
84d7fce6
PNA		 1364static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1365 u32 portid, u32 seq, int event, u32 flags,
1366 int family, const struct nft_table *table,
96518518
PM		 1367 const struct nft_chain *chain)
1368{
1369 struct nlmsghdr *nlh;
1370 struct nfgenmsg *nfmsg;
1371
dedb67c4 1372 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1373 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1374 if (nlh == NULL)
1375 goto nla_put_failure;
1376
1377 nfmsg = nlmsg_data(nlh);
1378 nfmsg->nfgen_family = family;
1379 nfmsg->version = NFNETLINK_V0;
84d7fce6 1380 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1381
1382 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1383 goto nla_put_failure;
b46f6ded
ND		 1384 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1385 NFTA_CHAIN_PAD))
96518518
PM		 1386 goto nla_put_failure;
1387 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1388 goto nla_put_failure;
1389
f323d954 1390 if (nft_is_base_chain(chain)) {
0ca743a5 1391 const struct nft_base_chain *basechain = nft_base_chain(chain);
edbd82c5 1392 struct nft_stats __percpu *stats;
0ca743a5 1393
d54725cd 1394 if (nft_dump_basechain_hook(skb, family, basechain))
2cbce139 1395 goto nla_put_failure;
9370761c 1396
0ca743a5
PNA		 1397 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1398 htonl(basechain->policy)))
1399 goto nla_put_failure;
1400
baae3e62
PM		 1401 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1402 goto nla_put_failure;
0ca743a5 1403
edbd82c5
FW		 1404 stats = rcu_dereference_check(basechain->stats,
1405 lockdep_commit_lock_is_held(net));
1406 if (nft_dump_stats(skb, stats))
0ca743a5 1407 goto nla_put_failure;
d78008de
PNA		 1408
1409 if ((chain->flags & NFT_CHAIN_HW_OFFLOAD) &&
1410 nla_put_be32(skb, NFTA_CHAIN_FLAGS,
1411 htonl(NFT_CHAIN_HW_OFFLOAD)))
1412 goto nla_put_failure;
96518518
PM		 1413 }
1414
0ca743a5
PNA		 1415 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1416 goto nla_put_failure;
1417
053c095a
JB		 1418 nlmsg_end(skb, nlh);
1419 return 0;
96518518
PM		 1420
1421nla_put_failure:
1422 nlmsg_trim(skb, nlh);
1423 return -1;
1424}
1425
25e94a99 1426static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1427{
1428 struct sk_buff *skb;
96518518
PM		 1429 int err;
1430
128ad332
PNA		 1431 if (!ctx->report &&
1432 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1433 return;
96518518 1434
96518518
PM		 1435 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1436 if (skb == NULL)
1437 goto err;
1438
84d7fce6 1439 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 1440 event, 0, ctx->family, ctx->table,
35151d84 1441 ctx->chain);
96518518
PM		 1442 if (err < 0) {
1443 kfree_skb(skb);
1444 goto err;
1445 }
1446
25e94a99
PNA		 1447 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1448 ctx->report, GFP_KERNEL);
1449 return;
96518518 1450err:
25e94a99 1451 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1452}
1453
1454static int nf_tables_dump_chains(struct sk_buff *skb,
1455 struct netlink_callback *cb)
1456{
1457 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 1458 const struct nft_table *table;
1459 const struct nft_chain *chain;
1460 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1461 struct net *net = sock_net(skb->sk);
96518518
PM		 1462 int family = nfmsg->nfgen_family;
1463
e688a7f8 1464 rcu_read_lock();
38e029f1
PNA		 1465 cb->seq = net->nft.base_seq;
1466
36596dad 1467 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 1468 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1469 continue;
1470
36596dad
PNA		 1471 list_for_each_entry_rcu(chain, &table->chains, list) {
1472 if (idx < s_idx)
1473 goto cont;
1474 if (idx > s_idx)
1475 memset(&cb->args[1], 0,
1476 sizeof(cb->args) - sizeof(cb->args[0]));
1477 if (!nft_is_active(net, chain))
1478 continue;
1479 if (nf_tables_fill_chain_info(skb, net,
1480 NETLINK_CB(cb->skb).portid,
1481 cb->nlh->nlmsg_seq,
1482 NFT_MSG_NEWCHAIN,
1483 NLM_F_MULTI,
98319cb9 1484 table->family, table,
36596dad
PNA		 1485 chain) < 0)
1486 goto done;
38e029f1 1487
36596dad 1488 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1489cont:
36596dad 1490 idx++;
96518518
PM		 1491 }
1492 }
1493done:
e688a7f8 1494 rcu_read_unlock();
96518518
PM		 1495 cb->args[0] = idx;
1496 return skb->len;
1497}
1498
d9adf22a 1499/* called with rcu_read_lock held */
7b8002a1
PNA		 1500static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1501 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1502 const struct nlattr * const nla[],
1503 struct netlink_ext_ack *extack)
96518518
PM		 1504{
1505 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1506 u8 genmask = nft_genmask_cur(net);
96518518 1507 const struct nft_chain *chain;
1b2470e5 1508 struct nft_table *table;
96518518
PM		 1509 struct sk_buff *skb2;
1510 int family = nfmsg->nfgen_family;
1511 int err;
1512
1513 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1514 struct netlink_dump_control c = {
1515 .dump = nf_tables_dump_chains,
d9adf22a 1516 .module = THIS_MODULE,
96518518 1517 };
d9adf22a
FW		 1518
1519 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 1520 }
1521
cac20fcd 1522 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1523 if (IS_ERR(table)) {
1524 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1525 return PTR_ERR(table);
36dd1bcc 1526 }
96518518 1527
f102d66b 1528 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1529 if (IS_ERR(chain)) {
1530 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1531 return PTR_ERR(chain);
36dd1bcc 1532 }
96518518 1533
d9adf22a 1534 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1535 if (!skb2)
1536 return -ENOMEM;
1537
84d7fce6 1538 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1539 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1540 family, table, chain);
1541 if (err < 0)
1542 goto err;
1543
1544 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1545
1546err:
1547 kfree_skb(skb2);
1548 return err;
1549}
1550
0ca743a5
PNA		 1551static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1552 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1553 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1554};
1555
ff3cd7b3 1556static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1557{
1558 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1559 struct nft_stats __percpu *newstats;
1560 struct nft_stats *stats;
1561 int err;
1562
8cb08174
JB		 1563 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1564 nft_counter_policy, NULL);
0ca743a5 1565 if (err < 0)
ff3cd7b3 1566 return ERR_PTR(err);
0ca743a5
PNA		 1567
1568 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1569 return ERR_PTR(-EINVAL);
0ca743a5 1570
ce355e20 1571 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1572 if (newstats == NULL)
ff3cd7b3 1573 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1574
1575 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1576 * are not exposed to userspace.
1577 */
e8781f70 1578 preempt_disable();
0ca743a5
PNA		 1579 stats = this_cpu_ptr(newstats);
1580 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1581 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1582 preempt_enable();
0ca743a5 1583
ff3cd7b3
PNA		 1584 return newstats;
1585}
1586
53315ac6 1587static void nft_chain_stats_replace(struct nft_trans *trans)
ff3cd7b3 1588{
53315ac6 1589 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
0befd061 1590
53315ac6 1591 if (!nft_trans_chain_stats(trans))
b88825de
PNA		 1592 return;
1593
b685b534
PM		 1594 nft_trans_chain_stats(trans) =
1595 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1596 lockdep_commit_lock_is_held(trans->ctx.net));
53315ac6
FW		 1597
1598 if (!nft_trans_chain_stats(trans))
bbb8c61f 1599 static_branch_inc(&nft_counters_enabled);
0ca743a5
PNA		 1600}
1601
0cbc06b3
FW		 1602static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1603{
1604 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1605 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1606
1607 if (g0 != g1)
1608 kvfree(g1);
1609 kvfree(g0);
1610
1611 /* should be NULL either via abort or via successful commit */
1612 WARN_ON_ONCE(chain->rules_next);
1613 kvfree(chain->rules_next);
1614}
1615
43a605f2 1616static void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1617{
43a605f2 1618 struct nft_chain *chain = ctx->chain;
d54725cd 1619 struct nft_hook *hook, *next;
43a605f2 1620
fa5950e4
FW		 1621 if (WARN_ON(chain->use > 0))
1622 return;
91c7b38d 1623
0cbc06b3
FW		 1624 /* no concurrent access possible anymore */
1625 nf_tables_chain_free_chain_rules(chain);
1626
f323d954 1627 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1628 struct nft_base_chain *basechain = nft_base_chain(chain);
1629
d54725cd
PNA		 1630 if (ctx->family == NFPROTO_NETDEV) {
1631 list_for_each_entry_safe(hook, next,
1632 &basechain->hook_list, list) {
1633 list_del_rcu(&hook->list);
1634 kfree_rcu(hook, rcu);
1635 }
1636 }
2cbce139 1637 module_put(basechain->type->owner);
4c05ec47 1638 if (rcu_access_pointer(basechain->stats)) {
9f08ea84 1639 static_branch_dec(&nft_counters_enabled);
4c05ec47
TY		 1640 free_percpu(rcu_dereference_raw(basechain->stats));
1641 }
b7263e07 1642 kfree(chain->name);
2cbce139 1643 kfree(basechain);
91c7b38d 1644 } else {
b7263e07 1645 kfree(chain->name);
91c7b38d
PNA		 1646 kfree(chain);
1647 }
1648}
1649
3f0465a9
PNA		 1650static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1651 const struct nlattr *attr)
1652{
1653 struct net_device *dev;
1654 char ifname[IFNAMSIZ];
1655 struct nft_hook *hook;
1656 int err;
1657
1658 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1659 if (!hook) {
1660 err = -ENOMEM;
1661 goto err_hook_alloc;
1662 }
1663
1664 nla_strlcpy(ifname, attr, IFNAMSIZ);
1665 dev = __dev_get_by_name(net, ifname);
1666 if (!dev) {
1667 err = -ENOENT;
1668 goto err_hook_dev;
1669 }
1670 hook->ops.dev = dev;
1671
1672 return hook;
1673
1674err_hook_dev:
1675 kfree(hook);
1676err_hook_alloc:
1677 return ERR_PTR(err);
1678}
1679
b75a3e83
PNA		 1680static bool nft_hook_list_find(struct list_head *hook_list,
1681 const struct nft_hook *this)
1682{
1683 struct nft_hook *hook;
1684
1685 list_for_each_entry(hook, hook_list, list) {
1686 if (this->ops.dev == hook->ops.dev)
1687 return true;
1688 }
1689
1690 return false;
1691}
1692
3f0465a9
PNA		 1693static int nf_tables_parse_netdev_hooks(struct net *net,
1694 const struct nlattr *attr,
1695 struct list_head *hook_list)
1696{
1697 struct nft_hook *hook, *next;
1698 const struct nlattr *tmp;
1699 int rem, n = 0, err;
1700
1701 nla_for_each_nested(tmp, attr, rem) {
1702 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1703 err = -EINVAL;
1704 goto err_hook;
1705 }
1706
1707 hook = nft_netdev_hook_alloc(net, tmp);
1708 if (IS_ERR(hook)) {
1709 err = PTR_ERR(hook);
1710 goto err_hook;
1711 }
b75a3e83 1712 if (nft_hook_list_find(hook_list, hook)) {
cd77e75b 1713 kfree(hook);
b75a3e83
PNA		 1714 err = -EEXIST;
1715 goto err_hook;
1716 }
3f0465a9
PNA		 1717 list_add_tail(&hook->list, hook_list);
1718 n++;
1719
cb662ac6 1720 if (n == NFT_NETDEVICE_MAX) {
3f0465a9
PNA		 1721 err = -EFBIG;
1722 goto err_hook;
1723 }
1724 }
1725 if (!n)
1726 return -EINVAL;
1727
1728 return 0;
1729
1730err_hook:
1731 list_for_each_entry_safe(hook, next, hook_list, list) {
1732 list_del(&hook->list);
1733 kfree(hook);
1734 }
1735 return err;
1736}
1737
508f8ccd
PNA		 1738struct nft_chain_hook {
1739 u32 num;
84ba7dd7 1740 s32 priority;
32537e91 1741 const struct nft_chain_type *type;
d54725cd 1742 struct list_head list;
508f8ccd
PNA		 1743};
1744
d54725cd
PNA		 1745static int nft_chain_parse_netdev(struct net *net,
1746 struct nlattr *tb[],
1747 struct list_head *hook_list)
1748{
1749 struct nft_hook *hook;
1750 int err;
1751
1752 if (tb[NFTA_HOOK_DEV]) {
1753 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1754 if (IS_ERR(hook))
1755 return PTR_ERR(hook);
1756
1757 list_add_tail(&hook->list, hook_list);
1758 } else if (tb[NFTA_HOOK_DEVS]) {
1759 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1760 hook_list);
1761 if (err < 0)
1762 return err;
1763 } else {
1764 return -EINVAL;
1765 }
1766
1767 return 0;
1768}
1769
508f8ccd
PNA		 1770static int nft_chain_parse_hook(struct net *net,
1771 const struct nlattr * const nla[],
36596dad 1772 struct nft_chain_hook *hook, u8 family,
445509eb 1773 bool autoload)
508f8ccd
PNA		 1774{
1775 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 1776 const struct nft_chain_type *type;
508f8ccd
PNA		 1777 int err;
1778
f102d66b
FW		 1779 lockdep_assert_held(&net->nft.commit_mutex);
1780 lockdep_nfnl_nft_mutex_not_held();
1781
8cb08174
JB		 1782 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1783 nla[NFTA_CHAIN_HOOK],
1784 nft_hook_policy, NULL);
508f8ccd
PNA		 1785 if (err < 0)
1786 return err;
1787
1788 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1789 ha[NFTA_HOOK_PRIORITY] == NULL)
1790 return -EINVAL;
1791
1792 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 1793 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1794
82603549
PNA		 1795 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1796 if (!type)
1797 return -EOPNOTSUPP;
1798
508f8ccd 1799 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 1800 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 1801 family, autoload);
508f8ccd
PNA		 1802 if (IS_ERR(type))
1803 return PTR_ERR(type);
1804 }
33d1c018 1805 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
508f8ccd 1806 return -EOPNOTSUPP;
84ba7dd7
FW		 1807
1808 if (type->type == NFT_CHAIN_T_NAT &&
1809 hook->priority <= NF_IP_PRI_CONNTRACK)
1810 return -EOPNOTSUPP;
1811
508f8ccd
PNA		 1812 if (!try_module_get(type->owner))
1813 return -ENOENT;
1814
1815 hook->type = type;
1816
d54725cd 1817 INIT_LIST_HEAD(&hook->list);
36596dad 1818 if (family == NFPROTO_NETDEV) {
d54725cd
PNA		 1819 err = nft_chain_parse_netdev(net, ha, &hook->list);
1820 if (err < 0) {
508f8ccd 1821 module_put(type->owner);
d54725cd 1822 return err;
508f8ccd 1823 }
d54725cd 1824 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
508f8ccd
PNA		 1825 module_put(type->owner);
1826 return -EOPNOTSUPP;
1827 }
1828
1829 return 0;
1830}
1831
1832static void nft_chain_release_hook(struct nft_chain_hook *hook)
1833{
d54725cd
PNA		 1834 struct nft_hook *h, *next;
1835
1836 list_for_each_entry_safe(h, next, &hook->list, list) {
1837 list_del(&h->list);
1838 kfree(h);
1839 }
508f8ccd 1840 module_put(hook->type->owner);
508f8ccd
PNA		 1841}
1842
0cbc06b3
FW		 1843struct nft_rules_old {
1844 struct rcu_head h;
1845 struct nft_rule **start;
1846};
1847
1848static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1849 unsigned int alloc)
1850{
1851 if (alloc > INT_MAX)
1852 return NULL;
1853
1854 alloc += 1; /* NULL, ends rules */
1855 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1856 return NULL;
1857
1858 alloc *= sizeof(struct nft_rule *);
1859 alloc += sizeof(struct nft_rules_old);
1860
1861 return kvmalloc(alloc, GFP_KERNEL);
1862}
1863
d54725cd
PNA		 1864static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1865 const struct nft_chain_hook *hook,
1866 struct nft_chain *chain)
1867{
1868 ops->pf = family;
1869 ops->hooknum = hook->num;
1870 ops->priority = hook->priority;
1871 ops->priv = chain;
1872 ops->hook = hook->type->hooks[ops->hooknum];
1873}
1874
1875static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1876 struct nft_chain_hook *hook, u32 flags)
1877{
1878 struct nft_chain *chain;
1879 struct nft_hook *h;
1880
1881 basechain->type = hook->type;
1882 INIT_LIST_HEAD(&basechain->hook_list);
1883 chain = &basechain->chain;
1884
1885 if (family == NFPROTO_NETDEV) {
1886 list_splice_init(&hook->list, &basechain->hook_list);
1887 list_for_each_entry(h, &basechain->hook_list, list)
1888 nft_basechain_hook_init(&h->ops, family, hook, chain);
1889
1890 basechain->ops.hooknum = hook->num;
1891 basechain->ops.priority = hook->priority;
1892 } else {
1893 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1894 }
1895
1896 chain->flags |= NFT_BASE_CHAIN | flags;
1897 basechain->policy = NF_ACCEPT;
1898 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1899 nft_chain_offload_priority(basechain) < 0)
1900 return -EOPNOTSUPP;
1901
1902 flow_block_init(&basechain->flow_block);
1903
1904 return 0;
1905}
1906
4035285f 1907static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
c9626a2c 1908 u8 policy, u32 flags)
4035285f
PNA		 1909{
1910 const struct nlattr * const *nla = ctx->nla;
1911 struct nft_table *table = ctx->table;
4035285f
PNA		 1912 struct nft_base_chain *basechain;
1913 struct nft_stats __percpu *stats;
1914 struct net *net = ctx->net;
66293c46 1915 struct nft_trans *trans;
4035285f 1916 struct nft_chain *chain;
0cbc06b3 1917 struct nft_rule **rules;
4035285f
PNA		 1918 int err;
1919
1920 if (table->use == UINT_MAX)
1921 return -EOVERFLOW;
1922
1923 if (nla[NFTA_CHAIN_HOOK]) {
1924 struct nft_chain_hook hook;
4035285f 1925
445509eb 1926 err = nft_chain_parse_hook(net, nla, &hook, family, true);
4035285f
PNA		 1927 if (err < 0)
1928 return err;
1929
1930 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1931 if (basechain == NULL) {
1932 nft_chain_release_hook(&hook);
1933 return -ENOMEM;
1934 }
d54725cd 1935 chain = &basechain->chain;
4035285f
PNA		 1936
1937 if (nla[NFTA_CHAIN_COUNTERS]) {
1938 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1939 if (IS_ERR(stats)) {
1940 nft_chain_release_hook(&hook);
1941 kfree(basechain);
1942 return PTR_ERR(stats);
1943 }
4c05ec47 1944 rcu_assign_pointer(basechain->stats, stats);
4035285f
PNA		 1945 static_branch_inc(&nft_counters_enabled);
1946 }
1947
d54725cd
PNA		 1948 err = nft_basechain_init(basechain, family, &hook, flags);
1949 if (err < 0) {
1950 nft_chain_release_hook(&hook);
1951 kfree(basechain);
1952 return err;
1953 }
4035285f
PNA		 1954 } else {
1955 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1956 if (chain == NULL)
1957 return -ENOMEM;
1958 }
43a605f2
PNA		 1959 ctx->chain = chain;
1960
4035285f
PNA		 1961 INIT_LIST_HEAD(&chain->rules);
1962 chain->handle = nf_tables_alloc_handle(table);
1963 chain->table = table;
1964 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1965 if (!chain->name) {
1966 err = -ENOMEM;
1967 goto err1;
1968 }
1969
0cbc06b3
FW		 1970 rules = nf_tables_chain_alloc_rules(chain, 0);
1971 if (!rules) {
1972 err = -ENOMEM;
1973 goto err1;
1974 }
1975
1976 *rules = NULL;
1977 rcu_assign_pointer(chain->rules_gen_0, rules);
1978 rcu_assign_pointer(chain->rules_gen_1, rules);
1979
c974a3a3 1980 err = nf_tables_register_hook(net, table, chain);
4035285f
PNA		 1981 if (err < 0)
1982 goto err1;
1983
1b2470e5
FW		 1984 err = rhltable_insert_key(&table->chains_ht, chain->name,
1985 &chain->rhlhead, nft_chain_ht_params);
1986 if (err)
1987 goto err2;
1988
66293c46
FW		 1989 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1990 if (IS_ERR(trans)) {
1991 err = PTR_ERR(trans);
1b2470e5
FW		 1992 rhltable_remove(&table->chains_ht, &chain->rhlhead,
1993 nft_chain_ht_params);
4035285f 1994 goto err2;
1b2470e5 1995 }
4035285f 1996
ad652f38 1997 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
66293c46
FW		 1998 if (nft_is_base_chain(chain))
1999 nft_trans_chain_policy(trans) = policy;
2000
4035285f
PNA		 2001 table->use++;
2002 list_add_tail_rcu(&chain->list, &table->chains);
2003
2004 return 0;
2005err2:
c974a3a3 2006 nf_tables_unregister_hook(net, table, chain);
4035285f 2007err1:
43a605f2 2008 nf_tables_chain_destroy(ctx);
4035285f
PNA		 2009
2010 return err;
2011}
2012
d54725cd
PNA		 2013static bool nft_hook_list_equal(struct list_head *hook_list1,
2014 struct list_head *hook_list2)
2015{
2016 struct nft_hook *hook;
2017 int n = 0, m = 0;
2018
2019 n = 0;
2020 list_for_each_entry(hook, hook_list2, list) {
2021 if (!nft_hook_list_find(hook_list1, hook))
2022 return false;
2023
2024 n++;
2025 }
2026 list_for_each_entry(hook, hook_list1, list)
2027 m++;
2028
2029 return n == m;
2030}
2031
c9626a2c
PNA		 2032static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2033 u32 flags)
2c4a488a
PNA		 2034{
2035 const struct nlattr * const *nla = ctx->nla;
2036 struct nft_table *table = ctx->table;
2037 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 2038 struct nft_base_chain *basechain;
2039 struct nft_stats *stats = NULL;
2040 struct nft_chain_hook hook;
2c4a488a
PNA		 2041 struct nf_hook_ops *ops;
2042 struct nft_trans *trans;
c974a3a3 2043 int err;
2c4a488a 2044
c9626a2c
PNA		 2045 if (chain->flags ^ flags)
2046 return -EOPNOTSUPP;
2047
2c4a488a
PNA		 2048 if (nla[NFTA_CHAIN_HOOK]) {
2049 if (!nft_is_base_chain(chain))
2050 return -EBUSY;
2051
36596dad 2052 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
445509eb 2053 false);
2c4a488a
PNA		 2054 if (err < 0)
2055 return err;
2056
2057 basechain = nft_base_chain(chain);
2058 if (basechain->type != hook.type) {
2059 nft_chain_release_hook(&hook);
2060 return -EBUSY;
2061 }
2062
d54725cd
PNA		 2063 if (ctx->family == NFPROTO_NETDEV) {
2064 if (!nft_hook_list_equal(&basechain->hook_list,
2065 &hook.list)) {
2066 nft_chain_release_hook(&hook);
2067 return -EBUSY;
2068 }
2069 } else {
2070 ops = &basechain->ops;
2071 if (ops->hooknum != hook.num ||
2072 ops->priority != hook.priority) {
2073 nft_chain_release_hook(&hook);
2074 return -EBUSY;
2075 }
2c4a488a
PNA		 2076 }
2077 nft_chain_release_hook(&hook);
2078 }
2079
2080 if (nla[NFTA_CHAIN_HANDLE] &&
2081 nla[NFTA_CHAIN_NAME]) {
2082 struct nft_chain *chain2;
2083
f102d66b
FW		 2084 chain2 = nft_chain_lookup(ctx->net, table,
2085 nla[NFTA_CHAIN_NAME], genmask);
0d18779b
JC		 2086 if (!IS_ERR(chain2))
2087 return -EEXIST;
2c4a488a
PNA		 2088 }
2089
2090 if (nla[NFTA_CHAIN_COUNTERS]) {
2091 if (!nft_is_base_chain(chain))
2092 return -EOPNOTSUPP;
2093
2094 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2095 if (IS_ERR(stats))
2096 return PTR_ERR(stats);
2097 }
2098
c6cc94df 2099 err = -ENOMEM;
2c4a488a
PNA		 2100 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2101 sizeof(struct nft_trans_chain));
c6cc94df
FW		 2102 if (trans == NULL)
2103 goto err;
2c4a488a
PNA		 2104
2105 nft_trans_chain_stats(trans) = stats;
2106 nft_trans_chain_update(trans) = true;
2107
2108 if (nla[NFTA_CHAIN_POLICY])
2109 nft_trans_chain_policy(trans) = policy;
2110 else
2111 nft_trans_chain_policy(trans) = -1;
2112
c6cc94df
FW		 2113 if (nla[NFTA_CHAIN_HANDLE] &&
2114 nla[NFTA_CHAIN_NAME]) {
2115 struct nft_trans *tmp;
2116 char *name;
2117
2118 err = -ENOMEM;
2119 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2120 if (!name)
2121 goto err;
2122
2123 err = -EEXIST;
2124 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2125 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2126 tmp->ctx.table == table &&
2127 nft_trans_chain_update(tmp) &&
2128 nft_trans_chain_name(tmp) &&
2129 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2130 kfree(name);
2131 goto err;
2132 }
2c4a488a 2133 }
c6cc94df
FW		 2134
2135 nft_trans_chain_name(trans) = name;
2c4a488a
PNA		 2136 }
2137 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2138
2139 return 0;
c6cc94df
FW		 2140err:
2141 free_percpu(stats);
2142 kfree(trans);
2143 return err;
2c4a488a
PNA		 2144}
2145
633c9a84
PNA		 2146static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2147 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2148 const struct nlattr * const nla[],
2149 struct netlink_ext_ack *extack)
96518518
PM		 2150{
2151 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4035285f
PNA		 2152 u8 genmask = nft_genmask_next(net);
2153 int family = nfmsg->nfgen_family;
36dd1bcc 2154 const struct nlattr *attr;
96518518
PM		 2155 struct nft_table *table;
2156 struct nft_chain *chain;
57de2a0c 2157 u8 policy = NF_ACCEPT;
4035285f 2158 struct nft_ctx ctx;
96518518 2159 u64 handle = 0;
c9626a2c 2160 u32 flags = 0;
96518518 2161
f102d66b
FW		 2162 lockdep_assert_held(&net->nft.commit_mutex);
2163
cac20fcd 2164 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 2165 if (IS_ERR(table)) {
2166 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2167 return PTR_ERR(table);
36dd1bcc 2168 }
96518518 2169
96518518 2170 chain = NULL;
36dd1bcc 2171 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 2172
2173 if (nla[NFTA_CHAIN_HANDLE]) {
2174 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 2175 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 2176 if (IS_ERR(chain)) {
2177 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 2178 return PTR_ERR(chain);
36dd1bcc
PNA		 2179 }
2180 attr = nla[NFTA_CHAIN_HANDLE];
96518518 2181 } else {
f102d66b 2182 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 2183 if (IS_ERR(chain)) {
36dd1bcc
PNA		 2184 if (PTR_ERR(chain) != -ENOENT) {
2185 NL_SET_BAD_ATTR(extack, attr);
96518518 2186 return PTR_ERR(chain);
36dd1bcc 2187 }
96518518
PM		 2188 chain = NULL;
2189 }
2190 }
2191
57de2a0c 2192 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 2193 if (chain != NULL &&
36dd1bcc
PNA		 2194 !nft_is_base_chain(chain)) {
2195 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 2196 return -EOPNOTSUPP;
36dd1bcc 2197 }
d6b6cb1d
PNA		 2198
2199 if (chain == NULL &&
36dd1bcc
PNA		 2200 nla[NFTA_CHAIN_HOOK] == NULL) {
2201 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 2202 return -EOPNOTSUPP;
36dd1bcc 2203 }
57de2a0c 2204
8f46df18 2205 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 2206 switch (policy) {
2207 case NF_DROP:
2208 case NF_ACCEPT:
2209 break;
2210 default:
2211 return -EINVAL;
2212 }
2213 }
2214
c9626a2c
PNA		 2215 if (nla[NFTA_CHAIN_FLAGS])
2216 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
b717273d
FW		 2217 else if (chain)
2218 flags = chain->flags;
c9626a2c 2219
98319cb9 2220 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
4035285f 2221
96518518 2222 if (chain != NULL) {
36dd1bcc
PNA		 2223 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2224 NL_SET_BAD_ATTR(extack, attr);
96518518 2225 return -EEXIST;
36dd1bcc 2226 }
96518518
PM		 2227 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2228 return -EOPNOTSUPP;
2229
1ed012f6 2230 flags |= chain->flags & NFT_BASE_CHAIN;
c9626a2c 2231 return nf_tables_updchain(&ctx, genmask, policy, flags);
96518518
PM		 2232 }
2233
c9626a2c 2234 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
96518518
PM		 2235}
2236
633c9a84
PNA		 2237static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2238 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2239 const struct nlattr * const nla[],
2240 struct netlink_ext_ack *extack)
96518518
PM		 2241{
2242 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2243 u8 genmask = nft_genmask_next(net);
36dd1bcc
PNA		 2244 int family = nfmsg->nfgen_family;
2245 const struct nlattr *attr;
96518518
PM		 2246 struct nft_table *table;
2247 struct nft_chain *chain;
9dee1474 2248 struct nft_rule *rule;
91c7b38d 2249 struct nft_ctx ctx;
3ecbfd65 2250 u64 handle;
9dee1474
PNA		 2251 u32 use;
2252 int err;
96518518 2253
cac20fcd 2254 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 2255 if (IS_ERR(table)) {
2256 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2257 return PTR_ERR(table);
36dd1bcc 2258 }
96518518 2259
3ecbfd65 2260 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 2261 attr = nla[NFTA_CHAIN_HANDLE];
2262 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 2263 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 2264 } else {
36dd1bcc 2265 attr = nla[NFTA_CHAIN_NAME];
f102d66b 2266 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 2267 }
36dd1bcc
PNA		 2268 if (IS_ERR(chain)) {
2269 NL_SET_BAD_ATTR(extack, attr);
96518518 2270 return PTR_ERR(chain);
36dd1bcc 2271 }
9dee1474
PNA		 2272
2273 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2274 chain->use > 0)
96518518
PM		 2275 return -EBUSY;
2276
98319cb9 2277 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0165d932 2278
9dee1474
PNA		 2279 use = chain->use;
2280 list_for_each_entry(rule, &chain->rules, list) {
2281 if (!nft_is_active_next(net, rule))
2282 continue;
2283 use--;
2284
2285 err = nft_delrule(&ctx, rule);
2286 if (err < 0)
2287 return err;
2288 }
2289
2290 /* There are rules and elements that are still holding references to us,
2291 * we cannot do a recursive removal in this case.
2292 */
36dd1bcc
PNA		 2293 if (use > 0) {
2294 NL_SET_BAD_ATTR(extack, attr);
9dee1474 2295 return -EBUSY;
36dd1bcc 2296 }
9dee1474 2297
ee01d542 2298 return nft_delchain(&ctx);
96518518
PM		 2299}
2300
96518518
PM		 2301/*
2302 * Expressions
2303 */
2304
2305/**
ef1f7df9
PM		 2306 * nft_register_expr - register nf_tables expr type
2307 * @ops: expr type
96518518 2308 *
ef1f7df9 2309 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 2310 * success or a negative errno code otherwise.
2311 */
ef1f7df9 2312int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 2313{
2314 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 2315 if (type->family == NFPROTO_UNSPEC)
e688a7f8 2316 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 2317 else
e688a7f8 2318 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 2319 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2320 return 0;
2321}
2322EXPORT_SYMBOL_GPL(nft_register_expr);
2323
2324/**
ef1f7df9
PM		 2325 * nft_unregister_expr - unregister nf_tables expr type
2326 * @ops: expr type
96518518 2327 *
ef1f7df9 2328 * Unregisters the expr typefor use with nf_tables.
96518518 2329 */
ef1f7df9 2330void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 2331{
2332 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2333 list_del_rcu(&type->list);
96518518
PM		 2334 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2335}
2336EXPORT_SYMBOL_GPL(nft_unregister_expr);
2337
64d46806
PM		 2338static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2339 struct nlattr *nla)
96518518 2340{
9cff126f 2341 const struct nft_expr_type *type, *candidate = NULL;
96518518 2342
ef1f7df9 2343 list_for_each_entry(type, &nf_tables_expressions, list) {
9cff126f
PNA		 2344 if (!nla_strcmp(nla, type->name)) {
2345 if (!type->family && !candidate)
2346 candidate = type;
2347 else if (type->family == family)
2348 candidate = type;
2349 }
96518518 2350 }
9cff126f 2351 return candidate;
96518518
PM		 2352}
2353
b9c04ae7
PNA		 2354#ifdef CONFIG_MODULES
2355static int nft_expr_type_request_module(struct net *net, u8 family,
2356 struct nlattr *nla)
2357{
eb014de4
PNA		 2358 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2359 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
b9c04ae7
PNA		 2360 return -EAGAIN;
2361
2362 return 0;
2363}
2364#endif
2365
452238e8
FW		 2366static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2367 u8 family,
64d46806 2368 struct nlattr *nla)
96518518 2369{
ef1f7df9 2370 const struct nft_expr_type *type;
96518518
PM		 2371
2372 if (nla == NULL)
2373 return ERR_PTR(-EINVAL);
2374
64d46806 2375 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 2376 if (type != NULL && try_module_get(type->owner))
2377 return type;
96518518 2378
f102d66b 2379 lockdep_nfnl_nft_mutex_not_held();
96518518 2380#ifdef CONFIG_MODULES
ef1f7df9 2381 if (type == NULL) {
b9c04ae7 2382 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
64d46806
PM		 2383 return ERR_PTR(-EAGAIN);
2384
eb014de4
PNA		 2385 if (nft_request_module(net, "nft-expr-%.*s",
2386 nla_len(nla),
2387 (char *)nla_data(nla)) == -EAGAIN)
96518518
PM		 2388 return ERR_PTR(-EAGAIN);
2389 }
2390#endif
2391 return ERR_PTR(-ENOENT);
2392}
2393
2394static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
9332d27d
FW		 2395 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2396 .len = NFT_MODULE_AUTOLOAD_LIMIT },
96518518
PM		 2397 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2398};
2399
2400static int nf_tables_fill_expr_info(struct sk_buff *skb,
2401 const struct nft_expr *expr)
2402{
ef1f7df9 2403 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 2404 goto nla_put_failure;
2405
2406 if (expr->ops->dump) {
ae0be8de
MK		 2407 struct nlattr *data = nla_nest_start_noflag(skb,
2408 NFTA_EXPR_DATA);
96518518
PM		 2409 if (data == NULL)
2410 goto nla_put_failure;
2411 if (expr->ops->dump(skb, expr) < 0)
2412 goto nla_put_failure;
2413 nla_nest_end(skb, data);
2414 }
2415
2416 return skb->len;
2417
2418nla_put_failure:
2419 return -1;
2420};
2421
0b2d8a7b
PM		 2422int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2423 const struct nft_expr *expr)
2424{
2425 struct nlattr *nest;
2426
ae0be8de 2427 nest = nla_nest_start_noflag(skb, attr);
0b2d8a7b
PM		 2428 if (!nest)
2429 goto nla_put_failure;
2430 if (nf_tables_fill_expr_info(skb, expr) < 0)
2431 goto nla_put_failure;
2432 nla_nest_end(skb, nest);
2433 return 0;
2434
2435nla_put_failure:
2436 return -1;
2437}
2438
96518518
PM		 2439struct nft_expr_info {
2440 const struct nft_expr_ops *ops;
ef1f7df9 2441 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2442};
2443
0ca743a5
PNA		 2444static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2445 const struct nlattr *nla,
96518518
PM		 2446 struct nft_expr_info *info)
2447{
ef1f7df9 2448 const struct nft_expr_type *type;
96518518 2449 const struct nft_expr_ops *ops;
ef1f7df9 2450 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2451 int err;
2452
8cb08174
JB		 2453 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2454 nft_expr_policy, NULL);
96518518
PM		 2455 if (err < 0)
2456 return err;
2457
452238e8 2458 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2459 if (IS_ERR(type))
2460 return PTR_ERR(type);
2461
2462 if (tb[NFTA_EXPR_DATA]) {
8cb08174
JB		 2463 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2464 tb[NFTA_EXPR_DATA],
2465 type->policy, NULL);
ef1f7df9
PM		 2466 if (err < 0)
2467 goto err1;
2468 } else
2469 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2470
2471 if (type->select_ops != NULL) {
0ca743a5
PNA		 2472 ops = type->select_ops(ctx,
2473 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2474 if (IS_ERR(ops)) {
2475 err = PTR_ERR(ops);
0ef1efd1
PNA		 2476#ifdef CONFIG_MODULES
2477 if (err == -EAGAIN)
eb014de4
PNA		 2478 if (nft_expr_type_request_module(ctx->net,
2479 ctx->family,
2480 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2481 err = -ENOENT;
0ef1efd1 2482#endif
ef1f7df9
PM		 2483 goto err1;
2484 }
2485 } else
2486 ops = type->ops;
2487
96518518
PM		 2488 info->ops = ops;
2489 return 0;
ef1f7df9
PM		 2490
2491err1:
2492 module_put(type->owner);
2493 return err;
96518518
PM		 2494}
2495
2496static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 2497 const struct nft_expr_info *info,
96518518
PM		 2498 struct nft_expr *expr)
2499{
2500 const struct nft_expr_ops *ops = info->ops;
2501 int err;
2502
2503 expr->ops = ops;
2504 if (ops->init) {
ef1f7df9 2505 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 2506 if (err < 0)
2507 goto err1;
2508 }
2509
96518518 2510 return 0;
96518518
PM		 2511err1:
2512 expr->ops = NULL;
2513 return err;
2514}
2515
62472bce
PM		 2516static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2517 struct nft_expr *expr)
96518518 2518{
3f3a390d
PNA		 2519 const struct nft_expr_type *type = expr->ops->type;
2520
96518518 2521 if (expr->ops->destroy)
62472bce 2522 expr->ops->destroy(ctx, expr);
3f3a390d 2523 module_put(type->owner);
96518518
PM		 2524}
2525
0b2d8a7b
PM		 2526struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2527 const struct nlattr *nla)
2528{
2529 struct nft_expr_info info;
2530 struct nft_expr *expr;
b8e20400 2531 struct module *owner;
0b2d8a7b
PM		 2532 int err;
2533
2534 err = nf_tables_expr_parse(ctx, nla, &info);
2535 if (err < 0)
2536 goto err1;
2537
2538 err = -ENOMEM;
2539 expr = kzalloc(info.ops->size, GFP_KERNEL);
2540 if (expr == NULL)
2541 goto err2;
2542
2543 err = nf_tables_newexpr(ctx, &info, expr);
2544 if (err < 0)
6cafaf47 2545 goto err3;
0b2d8a7b
PM		 2546
2547 return expr;
6cafaf47
LZ		 2548err3:
2549 kfree(expr);
0b2d8a7b 2550err2:
b8e20400
PNA		 2551 owner = info.ops->type->owner;
2552 if (info.ops->type->release_ops)
2553 info.ops->type->release_ops(info.ops);
2554
2555 module_put(owner);
0b2d8a7b
PM		 2556err1:
2557 return ERR_PTR(err);
2558}
2559
2560void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2561{
2562 nf_tables_expr_destroy(ctx, expr);
2563 kfree(expr);
2564}
2565
96518518
PM		 2566/*
2567 * Rules
2568 */
2569
cac20fcd
PNA		 2570static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2571 u64 handle)
96518518
PM		 2572{
2573 struct nft_rule *rule;
2574
2575 // FIXME: this sucks
d9adf22a 2576 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 2577 if (handle == rule->handle)
2578 return rule;
2579 }
2580
2581 return ERR_PTR(-ENOENT);
2582}
2583
cac20fcd
PNA		 2584static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2585 const struct nlattr *nla)
96518518
PM		 2586{
2587 if (nla == NULL)
2588 return ERR_PTR(-EINVAL);
2589
cac20fcd 2590 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 2591}
2592
2593static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 2594 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2595 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 2596 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2597 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2598 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2599 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 2600 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 2601 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 2602 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2603 .len = NFT_USERDATA_MAXLEN },
467697d2 2604 [NFTA_RULE_ID] = { .type = NLA_U32 },
0604628b 2605 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
96518518
PM		 2606};
2607
84d7fce6
PNA		 2608static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2609 u32 portid, u32 seq, int event,
2610 u32 flags, int family,
96518518
PM		 2611 const struct nft_table *table,
2612 const struct nft_chain *chain,
2c82c7e7
FW		 2613 const struct nft_rule *rule,
2614 const struct nft_rule *prule)
96518518
PM		 2615{
2616 struct nlmsghdr *nlh;
2617 struct nfgenmsg *nfmsg;
2618 const struct nft_expr *expr, *next;
2619 struct nlattr *list;
dedb67c4 2620 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 2621
dedb67c4 2622 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 2623 if (nlh == NULL)
2624 goto nla_put_failure;
2625
2626 nfmsg = nlmsg_data(nlh);
2627 nfmsg->nfgen_family = family;
2628 nfmsg->version = NFNETLINK_V0;
84d7fce6 2629 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 2630
2631 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2632 goto nla_put_failure;
2633 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2634 goto nla_put_failure;
b46f6ded
ND		 2635 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2636 NFTA_RULE_PAD))
96518518
PM		 2637 goto nla_put_failure;
2638
2c82c7e7 2639 if (event != NFT_MSG_DELRULE && prule) {
5e948466 2640 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 2641 cpu_to_be64(prule->handle),
2642 NFTA_RULE_PAD))
5e948466
EL		 2643 goto nla_put_failure;
2644 }
2645
ae0be8de 2646 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
96518518
PM		 2647 if (list == NULL)
2648 goto nla_put_failure;
2649 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 2650 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 2651 goto nla_put_failure;
96518518
PM		 2652 }
2653 nla_nest_end(skb, list);
2654
86f1ec32
PM		 2655 if (rule->udata) {
2656 struct nft_userdata *udata = nft_userdata(rule);
2657 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2658 udata->data) < 0)
2659 goto nla_put_failure;
2660 }
0768b3b3 2661
053c095a
JB		 2662 nlmsg_end(skb, nlh);
2663 return 0;
96518518
PM		 2664
2665nla_put_failure:
2666 nlmsg_trim(skb, nlh);
2667 return -1;
2668}
2669
25e94a99
PNA		 2670static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2671 const struct nft_rule *rule, int event)
96518518
PM		 2672{
2673 struct sk_buff *skb;
96518518
PM		 2674 int err;
2675
128ad332
PNA		 2676 if (!ctx->report &&
2677 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2678 return;
96518518 2679
96518518
PM		 2680 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2681 if (skb == NULL)
2682 goto err;
2683
84d7fce6 2684 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 2685 event, 0, ctx->family, ctx->table,
2c82c7e7 2686 ctx->chain, rule, NULL);
96518518
PM		 2687 if (err < 0) {
2688 kfree_skb(skb);
2689 goto err;
2690 }
2691
25e94a99
PNA		 2692 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2693 ctx->report, GFP_KERNEL);
2694 return;
96518518 2695err:
25e94a99 2696 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2697}
2698
6e1f760e 2699struct nft_rule_dump_ctx {
e46abbcc 2700 char *table;
b7263e07 2701 char *chain;
6e1f760e
PNA		 2702};
2703
241faece
PS		 2704static int __nf_tables_dump_rules(struct sk_buff *skb,
2705 unsigned int *idx,
2706 struct netlink_callback *cb,
2707 const struct nft_table *table,
2708 const struct nft_chain *chain)
2709{
2710 struct net *net = sock_net(skb->sk);
2c82c7e7 2711 const struct nft_rule *rule, *prule;
241faece 2712 unsigned int s_idx = cb->args[0];
241faece 2713
2c82c7e7 2714 prule = NULL;
241faece
PS		 2715 list_for_each_entry_rcu(rule, &chain->rules, list) {
2716 if (!nft_is_active(net, rule))
2c82c7e7 2717 goto cont_skip;
241faece
PS		 2718 if (*idx < s_idx)
2719 goto cont;
2720 if (*idx > s_idx) {
2721 memset(&cb->args[1], 0,
2722 sizeof(cb->args) - sizeof(cb->args[0]));
2723 }
2724 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2725 cb->nlh->nlmsg_seq,
2726 NFT_MSG_NEWRULE,
2727 NLM_F_MULTI | NLM_F_APPEND,
2728 table->family,
2c82c7e7 2729 table, chain, rule, prule) < 0)
310529e6 2730 return 1;
241faece
PS		 2731
2732 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2733cont:
2c82c7e7
FW		 2734 prule = rule;
2735cont_skip:
241faece
PS		 2736 (*idx)++;
2737 }
310529e6 2738 return 0;
241faece
PS		 2739}
2740
96518518
PM		 2741static int nf_tables_dump_rules(struct sk_buff *skb,
2742 struct netlink_callback *cb)
2743{
2744 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2745 const struct nft_rule_dump_ctx *ctx = cb->data;
241faece 2746 struct nft_table *table;
96518518 2747 const struct nft_chain *chain;
241faece 2748 unsigned int idx = 0;
99633ab2 2749 struct net *net = sock_net(skb->sk);
96518518
PM		 2750 int family = nfmsg->nfgen_family;
2751
e688a7f8 2752 rcu_read_lock();
38e029f1
PNA		 2753 cb->seq = net->nft.base_seq;
2754
36596dad 2755 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 2756 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 2757 continue;
2758
2759 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 2760 continue;
2761
715849ab 2762 if (ctx && ctx->table && ctx->chain) {
241faece 2763 struct rhlist_head *list, *tmp;
6e1f760e 2764
241faece
PS		 2765 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2766 nft_chain_ht_params);
2767 if (!list)
2768 goto done;
2769
2770 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2771 if (!nft_is_active(net, chain))
2772 continue;
2773 __nf_tables_dump_rules(skb, &idx,
2774 cb, table, chain);
2775 break;
96518518 2776 }
241faece 2777 goto done;
96518518 2778 }
241faece
PS		 2779
2780 list_for_each_entry_rcu(chain, &table->chains, list) {
2781 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2782 goto done;
2783 }
2784
2785 if (ctx && ctx->table)
2786 break;
96518518
PM		 2787 }
2788done:
e688a7f8 2789 rcu_read_unlock();
310529e6
PS		 2790
2791 cb->args[0] = idx;
96518518
PM		 2792 return skb->len;
2793}
2794
90fd131a
FW		 2795static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2796{
2797 const struct nlattr * const *nla = cb->data;
2798 struct nft_rule_dump_ctx *ctx = NULL;
2799
2800 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2801 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2802 if (!ctx)
2803 return -ENOMEM;
2804
2805 if (nla[NFTA_RULE_TABLE]) {
2806 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2807 GFP_ATOMIC);
2808 if (!ctx->table) {
2809 kfree(ctx);
2810 return -ENOMEM;
2811 }
2812 }
2813 if (nla[NFTA_RULE_CHAIN]) {
2814 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2815 GFP_ATOMIC);
2816 if (!ctx->chain) {
2817 kfree(ctx->table);
2818 kfree(ctx);
2819 return -ENOMEM;
2820 }
2821 }
2822 }
2823
2824 cb->data = ctx;
2825 return 0;
2826}
2827
6e1f760e
PNA		 2828static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2829{
e46abbcc
PS		 2830 struct nft_rule_dump_ctx *ctx = cb->data;
2831
2832 if (ctx) {
2833 kfree(ctx->table);
b7263e07 2834 kfree(ctx->chain);
e46abbcc
PS		 2835 kfree(ctx);
2836 }
6e1f760e
PNA		 2837 return 0;
2838}
2839
d9adf22a 2840/* called with rcu_read_lock held */
7b8002a1
PNA		 2841static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2842 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2843 const struct nlattr * const nla[],
2844 struct netlink_ext_ack *extack)
96518518
PM		 2845{
2846 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2847 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2848 const struct nft_chain *chain;
2849 const struct nft_rule *rule;
1b2470e5 2850 struct nft_table *table;
96518518
PM		 2851 struct sk_buff *skb2;
2852 int family = nfmsg->nfgen_family;
2853 int err;
2854
2855 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2856 struct netlink_dump_control c = {
90fd131a 2857 .start= nf_tables_dump_rules_start,
96518518 2858 .dump = nf_tables_dump_rules,
6e1f760e 2859 .done = nf_tables_dump_rules_done,
d9adf22a 2860 .module = THIS_MODULE,
90fd131a 2861 .data = (void *)nla,
96518518 2862 };
6e1f760e 2863
d9adf22a 2864 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 2865 }
2866
cac20fcd 2867 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2868 if (IS_ERR(table)) {
2869 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2870 return PTR_ERR(table);
36dd1bcc 2871 }
96518518 2872
f102d66b 2873 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 2874 if (IS_ERR(chain)) {
2875 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 2876 return PTR_ERR(chain);
36dd1bcc 2877 }
96518518 2878
cac20fcd 2879 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 2880 if (IS_ERR(rule)) {
2881 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2882 return PTR_ERR(rule);
36dd1bcc 2883 }
96518518 2884
d9adf22a 2885 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 2886 if (!skb2)
2887 return -ENOMEM;
2888
84d7fce6 2889 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518 2890 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2c82c7e7 2891 family, table, chain, rule, NULL);
96518518
PM		 2892 if (err < 0)
2893 goto err;
2894
2895 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2896
2897err:
2898 kfree_skb(skb2);
2899 return err;
2900}
2901
62472bce
PM		 2902static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2903 struct nft_rule *rule)
96518518 2904{
29e38801 2905 struct nft_expr *expr, *next;
96518518
PM		 2906
2907 /*
2908 * Careful: some expressions might not be initialized in case this
2909 * is called on error from nf_tables_newrule().
2910 */
2911 expr = nft_expr_first(rule);
3e38df13 2912 while (expr != nft_expr_last(rule) && expr->ops) {
29e38801 2913 next = nft_expr_next(expr);
62472bce 2914 nf_tables_expr_destroy(ctx, expr);
29e38801 2915 expr = next;
96518518
PM		 2916 }
2917 kfree(rule);
2918}
2919
bb7b40ae
PNA		 2920static void nf_tables_rule_release(const struct nft_ctx *ctx,
2921 struct nft_rule *rule)
2922{
f6ac8585 2923 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
bb7b40ae
PNA		 2924 nf_tables_rule_destroy(ctx, rule);
2925}
2926
a654de8f
PNA		 2927int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2928{
2929 struct nft_expr *expr, *last;
2930 const struct nft_data *data;
2931 struct nft_rule *rule;
2932 int err;
2933
26b2f552
TY		 2934 if (ctx->level == NFT_JUMP_STACK_SIZE)
2935 return -EMLINK;
2936
a654de8f
PNA		 2937 list_for_each_entry(rule, &chain->rules, list) {
2938 if (!nft_is_active_next(ctx->net, rule))
2939 continue;
2940
2941 nft_rule_for_each_expr(expr, last, rule) {
2942 if (!expr->ops->validate)
2943 continue;
2944
2945 err = expr->ops->validate(ctx, expr, &data);
2946 if (err < 0)
2947 return err;
2948 }
2949 }
2950
2951 return 0;
2952}
2953EXPORT_SYMBOL_GPL(nft_chain_validate);
2954
2955static int nft_table_validate(struct net *net, const struct nft_table *table)
2956{
2957 struct nft_chain *chain;
2958 struct nft_ctx ctx = {
2959 .net = net,
2960 .family = table->family,
2961 };
2962 int err;
2963
2964 list_for_each_entry(chain, &table->chains, list) {
2965 if (!nft_is_base_chain(chain))
2966 continue;
2967
2968 ctx.chain = chain;
2969 err = nft_chain_validate(&ctx, chain);
2970 if (err < 0)
2971 return err;
2972 }
2973
2974 return 0;
2975}
2976
75dd48e2
PS		 2977static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2978 const struct nlattr *nla);
2979
1081d11b
PNA		 2980#define NFT_RULE_MAXEXPRS 128
2981
633c9a84
PNA		 2982static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2983 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2984 const struct nlattr * const nla[],
2985 struct netlink_ext_ack *extack)
96518518
PM		 2986{
2987 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2988 u8 genmask = nft_genmask_next(net);
2a43ecf9 2989 struct nft_expr_info *info = NULL;
98319cb9 2990 int family = nfmsg->nfgen_family;
c9626a2c 2991 struct nft_flow_rule *flow;
96518518
PM		 2992 struct nft_table *table;
2993 struct nft_chain *chain;
2994 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 2995 struct nft_userdata *udata;
1081d11b 2996 struct nft_trans *trans = NULL;
96518518
PM		 2997 struct nft_expr *expr;
2998 struct nft_ctx ctx;
2999 struct nlattr *tmp;
86f1ec32 3000 unsigned int size, i, n, ulen = 0, usize = 0;
96518518 3001 int err, rem;
5e948466 3002 u64 handle, pos_handle;
96518518 3003
f102d66b
FW		 3004 lockdep_assert_held(&net->nft.commit_mutex);
3005
cac20fcd 3006 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 3007 if (IS_ERR(table)) {
3008 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3009 return PTR_ERR(table);
36dd1bcc 3010 }
96518518 3011
f102d66b 3012 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 3013 if (IS_ERR(chain)) {
3014 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 3015 return PTR_ERR(chain);
36dd1bcc 3016 }
96518518
PM		 3017
3018 if (nla[NFTA_RULE_HANDLE]) {
3019 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 3020 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 3021 if (IS_ERR(rule)) {
3022 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3023 return PTR_ERR(rule);
36dd1bcc 3024 }
96518518 3025
36dd1bcc
PNA		 3026 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3027 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3028 return -EEXIST;
36dd1bcc 3029 }
96518518
PM		 3030 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3031 old_rule = rule;
3032 else
3033 return -EOPNOTSUPP;
3034 } else {
445509eb
PNA		 3035 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3036 nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3037 return -EINVAL;
3038 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 3039
3040 if (chain->use == UINT_MAX)
3041 return -EOVERFLOW;
5e948466 3042
447750f2
FW		 3043 if (nla[NFTA_RULE_POSITION]) {
3044 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3045 old_rule = __nft_rule_lookup(chain, pos_handle);
3046 if (IS_ERR(old_rule)) {
3047 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3048 return PTR_ERR(old_rule);
3049 }
75dd48e2
PS		 3050 } else if (nla[NFTA_RULE_POSITION_ID]) {
3051 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3052 if (IS_ERR(old_rule)) {
3053 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3054 return PTR_ERR(old_rule);
3055 }
36dd1bcc 3056 }
5e948466
EL		 3057 }
3058
98319cb9 3059 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0ca743a5 3060
96518518
PM		 3061 n = 0;
3062 size = 0;
3063 if (nla[NFTA_RULE_EXPRESSIONS]) {
2a43ecf9
FW		 3064 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3065 sizeof(struct nft_expr_info),
3066 GFP_KERNEL);
3067 if (!info)
3068 return -ENOMEM;
3069
96518518
PM		 3070 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3071 err = -EINVAL;
3072 if (nla_type(tmp) != NFTA_LIST_ELEM)
3073 goto err1;
3074 if (n == NFT_RULE_MAXEXPRS)
3075 goto err1;
0ca743a5 3076 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 3077 if (err < 0)
3078 goto err1;
3079 size += info[n].ops->size;
3080 n++;
3081 }
3082 }
9889840f
PM		 3083 /* Check for overflow of dlen field */
3084 err = -EFBIG;
3085 if (size >= 1 << 12)
3086 goto err1;
96518518 3087
86f1ec32 3088 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 3089 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 3090 if (ulen > 0)
3091 usize = sizeof(struct nft_userdata) + ulen;
3092 }
0768b3b3 3093
96518518 3094 err = -ENOMEM;
86f1ec32 3095 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 3096 if (rule == NULL)
3097 goto err1;
3098
889f7ee7 3099 nft_activate_next(net, rule);
0628b123 3100
96518518
PM		 3101 rule->handle = handle;
3102 rule->dlen = size;
86f1ec32 3103 rule->udata = ulen ? 1 : 0;
0768b3b3 3104
86f1ec32
PM		 3105 if (ulen) {
3106 udata = nft_userdata(rule);
3107 udata->len = ulen - 1;
3108 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3109 }
96518518 3110
96518518
PM		 3111 expr = nft_expr_first(rule);
3112 for (i = 0; i < n; i++) {
3113 err = nf_tables_newexpr(&ctx, &info[i], expr);
3114 if (err < 0)
3115 goto err2;
a654de8f
PNA		 3116
3117 if (info[i].ops->validate)
3118 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3119
ef1f7df9 3120 info[i].ops = NULL;
96518518
PM		 3121 expr = nft_expr_next(expr);
3122 }
3123
96518518 3124 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
ca089878 3125 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
569ccae6
FW		 3126 if (trans == NULL) {
3127 err = -ENOMEM;
3128 goto err2;
3129 }
ca089878
TY		 3130 err = nft_delrule(&ctx, old_rule);
3131 if (err < 0) {
3132 nft_trans_destroy(trans);
569ccae6
FW		 3133 goto err2;
3134 }
3135
3136 list_add_tail_rcu(&rule->list, &old_rule->list);
3137 } else {
c9626a2c
PNA		 3138 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3139 if (!trans) {
569ccae6
FW		 3140 err = -ENOMEM;
3141 goto err2;
3142 }
3143
3144 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3145 if (old_rule)
3146 list_add_rcu(&rule->list, &old_rule->list);
3147 else
3148 list_add_tail_rcu(&rule->list, &chain->rules);
3149 } else {
3150 if (old_rule)
3151 list_add_tail_rcu(&rule->list, &old_rule->list);
3152 else
3153 list_add_rcu(&rule->list, &chain->rules);
3154 }
0628b123 3155 }
2a43ecf9 3156 kvfree(info);
4fefee57 3157 chain->use++;
96518518 3158
a654de8f
PNA		 3159 if (net->nft.validate_state == NFT_VALIDATE_DO)
3160 return nft_table_validate(net, table);
3161
c9626a2c 3162 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
be2861dc 3163 flow = nft_flow_rule_create(net, rule);
c9626a2c
PNA		 3164 if (IS_ERR(flow))
3165 return PTR_ERR(flow);
3166
3167 nft_trans_flow_rule(trans) = flow;
3168 }
3169
a654de8f 3170 return 0;
96518518 3171err2:
bb7b40ae 3172 nf_tables_rule_release(&ctx, rule);
96518518
PM		 3173err1:
3174 for (i = 0; i < n; i++) {
b25a31bf 3175 if (info[i].ops) {
ef1f7df9 3176 module_put(info[i].ops->type->owner);
b25a31bf
TY		 3177 if (info[i].ops->type->release_ops)
3178 info[i].ops->type->release_ops(info[i].ops);
3179 }
96518518 3180 }
2a43ecf9 3181 kvfree(info);
96518518
PM		 3182 return err;
3183}
3184
1a94e38d
PNA		 3185static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3186 const struct nlattr *nla)
3187{
3188 u32 id = ntohl(nla_get_be32(nla));
3189 struct nft_trans *trans;
3190
3191 list_for_each_entry(trans, &net->nft.commit_list, list) {
3192 struct nft_rule *rule = nft_trans_rule(trans);
3193
3194 if (trans->msg_type == NFT_MSG_NEWRULE &&
3195 id == nft_trans_rule_id(trans))
3196 return rule;
3197 }
3198 return ERR_PTR(-ENOENT);
3199}
3200
633c9a84
PNA		 3201static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3202 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3203 const struct nlattr * const nla[],
3204 struct netlink_ext_ack *extack)
96518518
PM		 3205{
3206 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3207 u8 genmask = nft_genmask_next(net);
7c95f6d8 3208 struct nft_table *table;
cf9dc09d
PNA		 3209 struct nft_chain *chain = NULL;
3210 struct nft_rule *rule;
0628b123
PNA		 3211 int family = nfmsg->nfgen_family, err = 0;
3212 struct nft_ctx ctx;
96518518 3213
cac20fcd 3214 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 3215 if (IS_ERR(table)) {
3216 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3217 return PTR_ERR(table);
36dd1bcc 3218 }
96518518 3219
cf9dc09d 3220 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 3221 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3222 genmask);
36dd1bcc
PNA		 3223 if (IS_ERR(chain)) {
3224 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 3225 return PTR_ERR(chain);
36dd1bcc 3226 }
cf9dc09d 3227 }
96518518 3228
98319cb9 3229 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0628b123 3230
cf9dc09d
PNA		 3231 if (chain) {
3232 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 3233 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3234 if (IS_ERR(rule)) {
3235 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 3236 return PTR_ERR(rule);
36dd1bcc 3237 }
96518518 3238
1a94e38d
PNA		 3239 err = nft_delrule(&ctx, rule);
3240 } else if (nla[NFTA_RULE_ID]) {
3241 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 3242 if (IS_ERR(rule)) {
3243 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 3244 return PTR_ERR(rule);
36dd1bcc 3245 }
1a94e38d 3246
5e266fe7 3247 err = nft_delrule(&ctx, rule);
cf9dc09d 3248 } else {
ce24b721 3249 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 3250 }
3251 } else {
3252 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 3253 if (!nft_is_active_next(net, chain))
3254 continue;
3255
cf9dc09d 3256 ctx.chain = chain;
ce24b721 3257 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 3258 if (err < 0)
3259 break;
3260 }
3261 }
3262
3263 return err;
3264}
3265
20a69341
PM		 3266/*
3267 * Sets
3268 */
3269
2b664957 3270static LIST_HEAD(nf_tables_set_types);
20a69341 3271
2b664957 3272int nft_register_set(struct nft_set_type *type)
20a69341
PM		 3273{
3274 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 3275 list_add_tail_rcu(&type->list, &nf_tables_set_types);
20a69341
PM		 3276 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3277 return 0;
3278}
3279EXPORT_SYMBOL_GPL(nft_register_set);
3280
2b664957 3281void nft_unregister_set(struct nft_set_type *type)
20a69341
PM		 3282{
3283 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2b664957 3284 list_del_rcu(&type->list);
20a69341
PM		 3285 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3286}
3287EXPORT_SYMBOL_GPL(nft_unregister_set);
3288
2b664957 3289#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 3290 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3291 NFT_SET_EVAL)
2b664957 3292
71cc0873 3293static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 3294{
71cc0873 3295 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 3296}
3297
c50b960c
PM		 3298/*
3299 * Select a set implementation based on the data characteristics and the
3300 * given policy. The total memory use might not be known if no size is
3301 * given, in that case the amount of memory per element is used.
3302 */
3303static const struct nft_set_ops *
2b664957
PNA		 3304nft_select_set_ops(const struct nft_ctx *ctx,
3305 const struct nlattr * const nla[],
c50b960c
PM		 3306 const struct nft_set_desc *desc,
3307 enum nft_set_policies policy)
20a69341 3308{
c50b960c
PM		 3309 const struct nft_set_ops *ops, *bops;
3310 struct nft_set_estimate est, best;
2b664957
PNA		 3311 const struct nft_set_type *type;
3312 u32 flags = 0;
20a69341 3313
f102d66b
FW		 3314 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3315 lockdep_nfnl_nft_mutex_not_held();
20a69341 3316#ifdef CONFIG_MODULES
2b664957 3317 if (list_empty(&nf_tables_set_types)) {
eb014de4 3318 if (nft_request_module(ctx->net, "nft-set") == -EAGAIN)
20a69341
PM		 3319 return ERR_PTR(-EAGAIN);
3320 }
3321#endif
2b664957
PNA		 3322 if (nla[NFTA_SET_FLAGS] != NULL)
3323 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 3324
55af753c
PNA		 3325 bops = NULL;
3326 best.size = ~0;
3327 best.lookup = ~0;
0b5a7874 3328 best.space = ~0;
c50b960c 3329
2b664957 3330 list_for_each_entry(type, &nf_tables_set_types, list) {
71cc0873 3331 ops = &type->ops;
2b664957 3332
71cc0873 3333 if (!nft_set_ops_candidate(type, flags))
20a69341 3334 continue;
2b664957 3335 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 3336 continue;
3337
3338 switch (policy) {
3339 case NFT_SET_POL_PERFORMANCE:
55af753c 3340 if (est.lookup < best.lookup)
c50b960c 3341 break;
644e334e
PNA		 3342 if (est.lookup == best.lookup &&
3343 est.space < best.space)
3344 break;
c50b960c
PM		 3345 continue;
3346 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 3347 if (!desc->size) {
3348 if (est.space < best.space)
3349 break;
3350 if (est.space == best.space &&
3351 est.lookup < best.lookup)
3352 break;
4f2921ca 3353 } else if (est.size < best.size || !bops) {
c50b960c 3354 break;
0b5a7874 3355 }
c50b960c
PM		 3356 continue;
3357 default:
3358 break;
3359 }
3360
2b664957 3361 if (!try_module_get(type->owner))
20a69341 3362 continue;
c50b960c 3363 if (bops != NULL)
71cc0873 3364 module_put(to_set_type(bops)->owner);
c50b960c
PM		 3365
3366 bops = ops;
3367 best = est;
20a69341
PM		 3368 }
3369
c50b960c
PM		 3370 if (bops != NULL)
3371 return bops;
3372
20a69341
PM		 3373 return ERR_PTR(-EOPNOTSUPP);
3374}
3375
3376static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 3377 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3378 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 3379 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 3380 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 3381 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3382 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3383 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3384 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3385 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 3386 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3387 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 3388 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 3389 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3390 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 3391 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3392 .len = NFT_USERDATA_MAXLEN },
8aeff920 3393 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 3394 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
c50b960c
PM		 3395};
3396
3397static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3398 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
f3a2181e 3399 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
20a69341
PM		 3400};
3401
633c9a84 3402static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3403 const struct sk_buff *skb,
3404 const struct nlmsghdr *nlh,
f2a6d766 3405 const struct nlattr * const nla[],
36dd1bcc 3406 struct netlink_ext_ack *extack,
f2a6d766 3407 u8 genmask)
20a69341
PM		 3408{
3409 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 3410 int family = nfmsg->nfgen_family;
7c95f6d8 3411 struct nft_table *table = NULL;
20a69341 3412
20a69341 3413 if (nla[NFTA_SET_TABLE] != NULL) {
cac20fcd
PNA		 3414 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3415 genmask);
36dd1bcc
PNA		 3416 if (IS_ERR(table)) {
3417 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 3418 return PTR_ERR(table);
36dd1bcc 3419 }
20a69341
PM		 3420 }
3421
98319cb9 3422 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 3423 return 0;
3424}
3425
cac20fcd
PNA		 3426static struct nft_set *nft_set_lookup(const struct nft_table *table,
3427 const struct nlattr *nla, u8 genmask)
20a69341
PM		 3428{
3429 struct nft_set *set;
3430
3431 if (nla == NULL)
3432 return ERR_PTR(-EINVAL);
3433
d9adf22a 3434 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 3435 if (!nla_strcmp(nla, set->name) &&
3436 nft_active_genmask(set, genmask))
20a69341
PM		 3437 return set;
3438 }
3439 return ERR_PTR(-ENOENT);
3440}
3441
cac20fcd
PNA		 3442static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3443 const struct nlattr *nla,
3444 u8 genmask)
3ecbfd65
HS		 3445{
3446 struct nft_set *set;
3447
3ecbfd65
HS		 3448 list_for_each_entry(set, &table->sets, list) {
3449 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3450 nft_active_genmask(set, genmask))
3451 return set;
3452 }
3453 return ERR_PTR(-ENOENT);
3454}
3455
cac20fcd
PNA		 3456static struct nft_set *nft_set_lookup_byid(const struct net *net,
3457 const struct nlattr *nla, u8 genmask)
958bee14
PNA		 3458{
3459 struct nft_trans *trans;
3460 u32 id = ntohl(nla_get_be32(nla));
3461
3462 list_for_each_entry(trans, &net->nft.commit_list, list) {
9c7f96fd
AK		 3463 if (trans->msg_type == NFT_MSG_NEWSET) {
3464 struct nft_set *set = nft_trans_set(trans);
37a9cc52 3465
9c7f96fd
AK		 3466 if (id == nft_trans_set_id(trans) &&
3467 nft_active_genmask(set, genmask))
3468 return set;
3469 }
958bee14
PNA		 3470 }
3471 return ERR_PTR(-ENOENT);
3472}
c7a72e3f 3473
10659cba
PNA		 3474struct nft_set *nft_set_lookup_global(const struct net *net,
3475 const struct nft_table *table,
3476 const struct nlattr *nla_set_name,
3477 const struct nlattr *nla_set_id,
3478 u8 genmask)
c7a72e3f
PNA		 3479{
3480 struct nft_set *set;
3481
cac20fcd 3482 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 3483 if (IS_ERR(set)) {
3484 if (!nla_set_id)
3485 return set;
3486
cac20fcd 3487 set = nft_set_lookup_byid(net, nla_set_id, genmask);
c7a72e3f
PNA		 3488 }
3489 return set;
3490}
10659cba 3491EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 3492
20a69341
PM		 3493static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3494 const char *name)
3495{
3496 const struct nft_set *i;
3497 const char *p;
3498 unsigned long *inuse;
60eb1894 3499 unsigned int n = 0, min = 0;
20a69341 3500
38745490 3501 p = strchr(name, '%');
20a69341
PM		 3502 if (p != NULL) {
3503 if (p[1] != 'd' || strchr(p + 2, '%'))
3504 return -EINVAL;
3505
3506 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3507 if (inuse == NULL)
3508 return -ENOMEM;
60eb1894 3509cont:
20a69341 3510 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 3511 int tmp;
3512
37a9cc52
PNA		 3513 if (!nft_is_active_next(ctx->net, set))
3514 continue;
14662917 3515 if (!sscanf(i->name, name, &tmp))
20a69341 3516 continue;
60eb1894 3517 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 3518 continue;
14662917 3519
60eb1894 3520 set_bit(tmp - min, inuse);
20a69341
PM		 3521 }
3522
53b70287 3523 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 3524 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3525 min += BITS_PER_BYTE * PAGE_SIZE;
3526 memset(inuse, 0, PAGE_SIZE);
3527 goto cont;
3528 }
20a69341
PM		 3529 free_page((unsigned long)inuse);
3530 }
3531
38745490
PS		 3532 set->name = kasprintf(GFP_KERNEL, name, min + n);
3533 if (!set->name)
3534 return -ENOMEM;
3535
20a69341 3536 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 3537 if (!nft_is_active_next(ctx->net, i))
3538 continue;
e63aaaa6
AY		 3539 if (!strcmp(set->name, i->name)) {
3540 kfree(set->name);
20a69341 3541 return -ENFILE;
e63aaaa6 3542 }
20a69341
PM		 3543 }
3544 return 0;
3545}
3546
8e1102d5
FW		 3547static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3548{
3549 u64 ms = be64_to_cpu(nla_get_be64(nla));
3550 u64 max = (u64)(~((u64)0));
3551
3552 max = div_u64(max, NSEC_PER_MSEC);
3553 if (ms >= max)
3554 return -ERANGE;
3555
3556 ms *= NSEC_PER_MSEC;
3557 *result = nsecs_to_jiffies64(ms);
3558 return 0;
3559}
3560
d6501de8 3561static __be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5 3562{
3b15d09f 3563 return cpu_to_be64(jiffies64_to_msecs(input));
8e1102d5
FW		 3564}
3565
f3a2181e
SB		 3566static int nf_tables_fill_set_concat(struct sk_buff *skb,
3567 const struct nft_set *set)
3568{
3569 struct nlattr *concat, *field;
3570 int i;
3571
3572 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3573 if (!concat)
3574 return -ENOMEM;
3575
3576 for (i = 0; i < set->field_count; i++) {
3577 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3578 if (!field)
3579 return -ENOMEM;
3580
3581 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3582 htonl(set->field_len[i])))
3583 return -ENOMEM;
3584
3585 nla_nest_end(skb, field);
3586 }
3587
3588 nla_nest_end(skb, concat);
3589
3590 return 0;
3591}
3592
20a69341
PM		 3593static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3594 const struct nft_set *set, u16 event, u16 flags)
3595{
3596 struct nfgenmsg *nfmsg;
3597 struct nlmsghdr *nlh;
c50b960c 3598 struct nlattr *desc;
128ad332
PNA		 3599 u32 portid = ctx->portid;
3600 u32 seq = ctx->seq;
20a69341 3601
dedb67c4 3602 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 3603 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3604 flags);
3605 if (nlh == NULL)
3606 goto nla_put_failure;
3607
3608 nfmsg = nlmsg_data(nlh);
36596dad 3609 nfmsg->nfgen_family = ctx->family;
20a69341 3610 nfmsg->version = NFNETLINK_V0;
84d7fce6 3611 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 3612
3613 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3614 goto nla_put_failure;
3615 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3616 goto nla_put_failure;
3ecbfd65
HS		 3617 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3618 NFTA_SET_PAD))
3619 goto nla_put_failure;
20a69341
PM		 3620 if (set->flags != 0)
3621 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3622 goto nla_put_failure;
3623
3624 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3625 goto nla_put_failure;
3626 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3627 goto nla_put_failure;
3628 if (set->flags & NFT_SET_MAP) {
3629 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3630 goto nla_put_failure;
3631 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3632 goto nla_put_failure;
3633 }
8aeff920
PNA		 3634 if (set->flags & NFT_SET_OBJECT &&
3635 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3636 goto nla_put_failure;
20a69341 3637
761da293 3638 if (set->timeout &&
d3e2a111 3639 nla_put_be64(skb, NFTA_SET_TIMEOUT,
8e1102d5 3640 nf_jiffies64_to_msecs(set->timeout),
b46f6ded 3641 NFTA_SET_PAD))
761da293
PM		 3642 goto nla_put_failure;
3643 if (set->gc_int &&
3644 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3645 goto nla_put_failure;
3646
9363dc4b
AB		 3647 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3648 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3649 goto nla_put_failure;
3650 }
3651
e6d8ecac
CFG		 3652 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3653 goto nla_put_failure;
3654
ae0be8de 3655 desc = nla_nest_start_noflag(skb, NFTA_SET_DESC);
f3a2181e 3656
c50b960c
PM		 3657 if (desc == NULL)
3658 goto nla_put_failure;
3659 if (set->size &&
3660 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3661 goto nla_put_failure;
f3a2181e
SB		 3662
3663 if (set->field_count > 1 &&
3664 nf_tables_fill_set_concat(skb, set))
3665 goto nla_put_failure;
3666
c50b960c
PM		 3667 nla_nest_end(skb, desc);
3668
053c095a
JB		 3669 nlmsg_end(skb, nlh);
3670 return 0;
20a69341
PM		 3671
3672nla_put_failure:
3673 nlmsg_trim(skb, nlh);
3674 return -1;
3675}
3676
25e94a99
PNA		 3677static void nf_tables_set_notify(const struct nft_ctx *ctx,
3678 const struct nft_set *set, int event,
3679 gfp_t gfp_flags)
20a69341
PM		 3680{
3681 struct sk_buff *skb;
128ad332 3682 u32 portid = ctx->portid;
20a69341
PM		 3683 int err;
3684
128ad332
PNA		 3685 if (!ctx->report &&
3686 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3687 return;
20a69341 3688
31f8441c 3689 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 3690 if (skb == NULL)
3691 goto err;
3692
3693 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3694 if (err < 0) {
3695 kfree_skb(skb);
3696 goto err;
3697 }
3698
25e94a99
PNA		 3699 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3700 gfp_flags);
3701 return;
20a69341 3702err:
25e94a99 3703 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 3704}
3705
5b96af77 3706static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 3707{
3708 const struct nft_set *set;
3709 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 3710 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3711 struct net *net = sock_net(skb->sk);
5b96af77 3712 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 3713
3714 if (cb->args[1])
3715 return skb->len;
3716
e688a7f8 3717 rcu_read_lock();
38e029f1
PNA		 3718 cb->seq = net->nft.base_seq;
3719
36596dad
PNA		 3720 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3721 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 3722 ctx->family != table->family)
36596dad
PNA		 3723 continue;
3724
3725 if (ctx->table && ctx->table != table)
5b96af77
PNA		 3726 continue;
3727
36596dad
PNA		 3728 if (cur_table) {
3729 if (cur_table != table)
c9c8e485
PNA		 3730 continue;
3731
36596dad 3732 cur_table = NULL;
c9c8e485 3733 }
36596dad
PNA		 3734 idx = 0;
3735 list_for_each_entry_rcu(set, &table->sets, list) {
3736 if (idx < s_idx)
3737 goto cont;
3738 if (!nft_is_active(net, set))
3739 goto cont;
5b96af77 3740
36596dad
PNA		 3741 ctx_set = *ctx;
3742 ctx_set.table = table;
98319cb9 3743 ctx_set.family = table->family;
c9c8e485 3744
36596dad
PNA		 3745 if (nf_tables_fill_set(skb, &ctx_set, set,
3746 NFT_MSG_NEWSET,
3747 NLM_F_MULTI) < 0) {
3748 cb->args[0] = idx;
3749 cb->args[2] = (unsigned long) table;
3750 goto done;
c9c8e485 3751 }
36596dad 3752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 3753cont:
36596dad 3754 idx++;
c9c8e485 3755 }
36596dad
PNA		 3756 if (s_idx)
3757 s_idx = 0;
c9c8e485
PNA		 3758 }
3759 cb->args[1] = 1;
3760done:
e688a7f8 3761 rcu_read_unlock();
c9c8e485
PNA		 3762 return skb->len;
3763}
3764
90fd131a
FW		 3765static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3766{
3767 struct nft_ctx *ctx_dump = NULL;
3768
3769 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3770 if (ctx_dump == NULL)
3771 return -ENOMEM;
3772
3773 cb->data = ctx_dump;
3774 return 0;
3775}
3776
5b96af77 3777static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 3778{
5b96af77
PNA		 3779 kfree(cb->data);
3780 return 0;
20a69341
PM		 3781}
3782
d9adf22a 3783/* called with rcu_read_lock held */
7b8002a1
PNA		 3784static int nf_tables_getset(struct net *net, struct sock *nlsk,
3785 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3786 const struct nlattr * const nla[],
3787 struct netlink_ext_ack *extack)
20a69341 3788{
f2a6d766 3789 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3790 const struct nft_set *set;
3791 struct nft_ctx ctx;
3792 struct sk_buff *skb2;
c9c8e485 3793 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 3794 int err;
3795
01cfa0a4 3796 /* Verify existence before starting dump */
36dd1bcc
PNA		 3797 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3798 genmask);
20a69341
PM		 3799 if (err < 0)
3800 return err;
3801
3802 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3803 struct netlink_dump_control c = {
90fd131a 3804 .start = nf_tables_dump_sets_start,
20a69341 3805 .dump = nf_tables_dump_sets,
5b96af77 3806 .done = nf_tables_dump_sets_done,
90fd131a 3807 .data = &ctx,
d9adf22a 3808 .module = THIS_MODULE,
20a69341 3809 };
5b96af77 3810
d9adf22a 3811 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
20a69341
PM		 3812 }
3813
c9c8e485
PNA		 3814 /* Only accept unspec with dump */
3815 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3816 return -EAFNOSUPPORT;
eaa2bcd6
PT		 3817 if (!nla[NFTA_SET_TABLE])
3818 return -EINVAL;
c9c8e485 3819
cac20fcd 3820 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3821 if (IS_ERR(set))
3822 return PTR_ERR(set);
3823
d9adf22a 3824 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 3825 if (skb2 == NULL)
3826 return -ENOMEM;
3827
3828 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3829 if (err < 0)
3830 goto err;
3831
3832 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3833
3834err:
3835 kfree_skb(skb2);
3836 return err;
3837}
3838
f3a2181e
SB		 3839static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
3840 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
3841};
3842
3843static int nft_set_desc_concat_parse(const struct nlattr *attr,
3844 struct nft_set_desc *desc)
3845{
3846 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
3847 u32 len;
3848 int err;
3849
3850 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
3851 nft_concat_policy, NULL);
3852 if (err < 0)
3853 return err;
3854
3855 if (!tb[NFTA_SET_FIELD_LEN])
3856 return -EINVAL;
3857
3858 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
3859
3860 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
3861 return -E2BIG;
3862
3863 desc->field_len[desc->field_count++] = len;
3864
3865 return 0;
3866}
3867
3868static int nft_set_desc_concat(struct nft_set_desc *desc,
3869 const struct nlattr *nla)
3870{
3871 struct nlattr *attr;
3872 int rem, err;
3873
3874 nla_for_each_nested(attr, nla, rem) {
3875 if (nla_type(attr) != NFTA_LIST_ELEM)
3876 return -EINVAL;
3877
3878 err = nft_set_desc_concat_parse(attr, desc);
3879 if (err < 0)
3880 return err;
3881 }
3882
3883 return 0;
3884}
3885
f7e840ee 3886static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
c50b960c
PM		 3887 const struct nlattr *nla)
3888{
3889 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3890 int err;
3891
8cb08174
JB		 3892 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3893 nft_set_desc_policy, NULL);
c50b960c
PM		 3894 if (err < 0)
3895 return err;
3896
3897 if (da[NFTA_SET_DESC_SIZE] != NULL)
3898 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
f3a2181e
SB		 3899 if (da[NFTA_SET_DESC_CONCAT])
3900 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
c50b960c 3901
f3a2181e 3902 return err;
c50b960c
PM		 3903}
3904
633c9a84
PNA		 3905static int nf_tables_newset(struct net *net, struct sock *nlsk,
3906 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3907 const struct nlattr * const nla[],
3908 struct netlink_ext_ack *extack)
20a69341
PM		 3909{
3910 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3911 u8 genmask = nft_genmask_next(net);
98319cb9 3912 int family = nfmsg->nfgen_family;
20a69341 3913 const struct nft_set_ops *ops;
20a69341
PM		 3914 struct nft_table *table;
3915 struct nft_set *set;
3916 struct nft_ctx ctx;
38745490 3917 char *name;
4ef360dd 3918 u64 size;
761da293 3919 u64 timeout;
8aeff920 3920 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 3921 struct nft_set_desc desc;
e6d8ecac
CFG		 3922 unsigned char *udata;
3923 u16 udlen;
20a69341 3924 int err;
f3a2181e 3925 int i;
20a69341
PM		 3926
3927 if (nla[NFTA_SET_TABLE] == NULL ||
3928 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 3929 nla[NFTA_SET_KEY_LEN] == NULL ||
3930 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 3931 return -EINVAL;
3932
c50b960c
PM		 3933 memset(&desc, 0, sizeof(desc));
3934
20a69341
PM		 3935 ktype = NFT_DATA_VALUE;
3936 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3937 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3938 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3939 return -EINVAL;
3940 }
3941
c50b960c 3942 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 3943 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3944 return -EINVAL;
3945
3946 flags = 0;
3947 if (nla[NFTA_SET_FLAGS] != NULL) {
3948 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3949 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 3950 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920
PNA		 3951 NFT_SET_MAP | NFT_SET_EVAL |
3952 NFT_SET_OBJECT))
20a69341 3953 return -EINVAL;
8aeff920 3954 /* Only one of these operations is supported */
acab7131
FW		 3955 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3956 (NFT_SET_MAP | NFT_SET_OBJECT))
3957 return -EOPNOTSUPP;
3958 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3959 (NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3960 return -EOPNOTSUPP;
20a69341
PM		 3961 }
3962
3963 dtype = 0;
20a69341
PM		 3964 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3965 if (!(flags & NFT_SET_MAP))
3966 return -EINVAL;
3967
3968 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3969 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3970 dtype != NFT_DATA_VERDICT)
3971 return -EINVAL;
3972
3973 if (dtype != NFT_DATA_VERDICT) {
3974 if (nla[NFTA_SET_DATA_LEN] == NULL)
3975 return -EINVAL;
c50b960c 3976 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 3977 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3978 return -EINVAL;
3979 } else
7d740264 3980 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 3981 } else if (flags & NFT_SET_MAP)
3982 return -EINVAL;
3983
8aeff920
PNA		 3984 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3985 if (!(flags & NFT_SET_OBJECT))
3986 return -EINVAL;
3987
3988 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3989 if (objtype == NFT_OBJECT_UNSPEC ||
3990 objtype > NFT_OBJECT_MAX)
3991 return -EINVAL;
3992 } else if (flags & NFT_SET_OBJECT)
3993 return -EINVAL;
3994 else
3995 objtype = NFT_OBJECT_UNSPEC;
3996
761da293
PM		 3997 timeout = 0;
3998 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3999 if (!(flags & NFT_SET_TIMEOUT))
4000 return -EINVAL;
8e1102d5
FW		 4001
4002 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4003 if (err)
4004 return err;
761da293
PM		 4005 }
4006 gc_int = 0;
4007 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4008 if (!(flags & NFT_SET_TIMEOUT))
4009 return -EINVAL;
4010 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4011 }
4012
c50b960c
PM		 4013 policy = NFT_SET_POL_PERFORMANCE;
4014 if (nla[NFTA_SET_POLICY] != NULL)
4015 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4016
4017 if (nla[NFTA_SET_DESC] != NULL) {
f7e840ee 4018 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
c50b960c
PM		 4019 if (err < 0)
4020 return err;
4021 }
4022
cac20fcd 4023 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
36dd1bcc
PNA		 4024 if (IS_ERR(table)) {
4025 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 4026 return PTR_ERR(table);
36dd1bcc 4027 }
20a69341 4028
98319cb9 4029 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
20a69341 4030
cac20fcd 4031 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 4032 if (IS_ERR(set)) {
36dd1bcc
PNA		 4033 if (PTR_ERR(set) != -ENOENT) {
4034 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4035 return PTR_ERR(set);
36dd1bcc 4036 }
1a28ad74 4037 } else {
36dd1bcc
PNA		 4038 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4039 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4040 return -EEXIST;
36dd1bcc 4041 }
20a69341
PM		 4042 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4043 return -EOPNOTSUPP;
36dd1bcc 4044
20a69341
PM		 4045 return 0;
4046 }
4047
4048 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4049 return -ENOENT;
4050
2b664957 4051 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 4052 if (IS_ERR(ops))
4053 return PTR_ERR(ops);
4054
e6d8ecac
CFG		 4055 udlen = 0;
4056 if (nla[NFTA_SET_USERDATA])
4057 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4058
20a69341
PM		 4059 size = 0;
4060 if (ops->privsize != NULL)
347b408d 4061 size = ops->privsize(nla, &desc);
20a69341 4062
1ff75a3e
PNA		 4063 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4064 if (!set) {
4065 err = -ENOMEM;
20a69341 4066 goto err1;
1ff75a3e 4067 }
20a69341 4068
38745490
PS		 4069 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4070 if (!name) {
4071 err = -ENOMEM;
4072 goto err2;
4073 }
4074
20a69341 4075 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 4076 kfree(name);
20a69341
PM		 4077 if (err < 0)
4078 goto err2;
4079
e6d8ecac
CFG		 4080 udata = NULL;
4081 if (udlen) {
4082 udata = set->data + size;
4083 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4084 }
4085
20a69341 4086 INIT_LIST_HEAD(&set->bindings);
3453c927
PNA		 4087 set->table = table;
4088 write_pnet(&set->net, net);
20a69341
PM		 4089 set->ops = ops;
4090 set->ktype = ktype;
c50b960c 4091 set->klen = desc.klen;
20a69341 4092 set->dtype = dtype;
8aeff920 4093 set->objtype = objtype;
c50b960c 4094 set->dlen = desc.dlen;
20a69341 4095 set->flags = flags;
c50b960c 4096 set->size = desc.size;
9363dc4b 4097 set->policy = policy;
e6d8ecac
CFG		 4098 set->udlen = udlen;
4099 set->udata = udata;
761da293
PM		 4100 set->timeout = timeout;
4101 set->gc_int = gc_int;
3ecbfd65 4102 set->handle = nf_tables_alloc_handle(table);
20a69341 4103
f3a2181e
SB		 4104 set->field_count = desc.field_count;
4105 for (i = 0; i < desc.field_count; i++)
4106 set->field_len[i] = desc.field_len[i];
4107
c50b960c 4108 err = ops->init(set, &desc, nla);
20a69341 4109 if (err < 0)
2f6adf48 4110 goto err3;
20a69341 4111
958bee14 4112 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 4113 if (err < 0)
2f6adf48 4114 goto err4;
20a69341 4115
e688a7f8 4116 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 4117 table->use++;
20a69341
PM		 4118 return 0;
4119
2f6adf48 4120err4:
c17c3cdf 4121 ops->destroy(set);
2f6adf48
FW		 4122err3:
4123 kfree(set->name);
20a69341 4124err2:
1ff75a3e 4125 kvfree(set);
20a69341 4126err1:
71cc0873 4127 module_put(to_set_type(ops)->owner);
20a69341
PM		 4128 return err;
4129}
4130
958bee14 4131static void nft_set_destroy(struct nft_set *set)
20a69341 4132{
273fe3f1
PNA		 4133 if (WARN_ON(set->use > 0))
4134 return;
4135
20a69341 4136 set->ops->destroy(set);
71cc0873 4137 module_put(to_set_type(set->ops)->owner);
38745490 4138 kfree(set->name);
1ff75a3e 4139 kvfree(set);
20a69341
PM		 4140}
4141
633c9a84
PNA		 4142static int nf_tables_delset(struct net *net, struct sock *nlsk,
4143 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4144 const struct nlattr * const nla[],
4145 struct netlink_ext_ack *extack)
20a69341 4146{
c9c8e485 4147 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 4148 u8 genmask = nft_genmask_next(net);
36dd1bcc 4149 const struct nlattr *attr;
20a69341
PM		 4150 struct nft_set *set;
4151 struct nft_ctx ctx;
4152 int err;
4153
ec2c9935
PM		 4154 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4155 return -EAFNOSUPPORT;
20a69341
PM		 4156 if (nla[NFTA_SET_TABLE] == NULL)
4157 return -EINVAL;
4158
36dd1bcc
PNA		 4159 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4160 genmask);
20a69341
PM		 4161 if (err < 0)
4162 return err;
4163
36dd1bcc
PNA		 4164 if (nla[NFTA_SET_HANDLE]) {
4165 attr = nla[NFTA_SET_HANDLE];
4166 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4167 } else {
4168 attr = nla[NFTA_SET_NAME];
4169 set = nft_set_lookup(ctx.table, attr, genmask);
4170 }
a8278400 4171
36dd1bcc
PNA		 4172 if (IS_ERR(set)) {
4173 NL_SET_BAD_ATTR(extack, attr);
4174 return PTR_ERR(set);
4175 }
273fe3f1 4176 if (set->use ||
36dd1bcc
PNA		 4177 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4178 NL_SET_BAD_ATTR(extack, attr);
20a69341 4179 return -EBUSY;
36dd1bcc 4180 }
20a69341 4181
ee01d542 4182 return nft_delset(&ctx, set);
20a69341
PM		 4183}
4184
4185static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 4186 struct nft_set *set,
20a69341 4187 const struct nft_set_iter *iter,
de70185d 4188 struct nft_set_elem *elem)
20a69341 4189{
fe2811eb 4190 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4191 enum nft_registers dreg;
4192
4193 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 4194 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4195 set->dtype == NFT_DATA_VERDICT ?
4196 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4197 set->dlen);
20a69341
PM		 4198}
4199
4200int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4201 struct nft_set_binding *binding)
4202{
4203 struct nft_set_binding *i;
4204 struct nft_set_iter iter;
4205
273fe3f1
PNA		 4206 if (set->use == UINT_MAX)
4207 return -EOVERFLOW;
4208
408070d6 4209 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 4210 return -EBUSY;
4211
11113e19 4212 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 4213 /* If the set is already bound to the same chain all
4214 * jumps are already validated for that chain.
4215 */
4216 list_for_each_entry(i, &set->bindings, list) {
a4684402 4217 if (i->flags & NFT_SET_MAP &&
11113e19 4218 i->chain == binding->chain)
20a69341
PM		 4219 goto bind;
4220 }
4221
8588ac09 4222 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4223 iter.skip = 0;
4224 iter.count = 0;
4225 iter.err = 0;
4226 iter.fn = nf_tables_bind_check_setelem;
4227
4228 set->ops->walk(ctx, set, &iter);
a02f4248 4229 if (iter.err < 0)
20a69341 4230 return iter.err;
20a69341
PM		 4231 }
4232bind:
4233 binding->chain = ctx->chain;
e688a7f8 4234 list_add_tail_rcu(&binding->list, &set->bindings);
f6ac8585 4235 nft_set_trans_bind(ctx, set);
273fe3f1 4236 set->use++;
f6ac8585 4237
20a69341
PM		 4238 return 0;
4239}
63aea290 4240EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341 4241
3b0a081d
FW		 4242static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4243 struct nft_set_binding *binding, bool event)
20a69341 4244{
e688a7f8 4245 list_del_rcu(&binding->list);
20a69341 4246
f6ac8585 4247 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
cd5125d8 4248 list_del_rcu(&set->list);
f6ac8585
PNA		 4249 if (event)
4250 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4251 GFP_KERNEL);
4252 }
20a69341
PM		 4253}
4254
273fe3f1
PNA		 4255void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4256 struct nft_set_binding *binding,
4257 enum nft_trans_phase phase)
4258{
4259 switch (phase) {
4260 case NFT_TRANS_PREPARE:
4261 set->use--;
4262 return;
4263 case NFT_TRANS_ABORT:
4264 case NFT_TRANS_RELEASE:
4265 set->use--;
4266 /* fall through */
4267 default:
4268 nf_tables_unbind_set(ctx, set, binding,
4269 phase == NFT_TRANS_COMMIT);
4270 }
4271}
4272EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4273
cd5125d8
FW		 4274void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4275{
f6ac8585 4276 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
cd5125d8 4277 nft_set_destroy(set);
cd5125d8
FW		 4278}
4279EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4280
3ac4c07a
PM		 4281const struct nft_set_ext_type nft_set_ext_types[] = {
4282 [NFT_SET_EXT_KEY] = {
7d740264 4283 .align = __alignof__(u32),
3ac4c07a
PM		 4284 },
4285 [NFT_SET_EXT_DATA] = {
7d740264 4286 .align = __alignof__(u32),
3ac4c07a 4287 },
f25ad2e9
PM		 4288 [NFT_SET_EXT_EXPR] = {
4289 .align = __alignof__(struct nft_expr),
4290 },
8aeff920
PNA		 4291 [NFT_SET_EXT_OBJREF] = {
4292 .len = sizeof(struct nft_object *),
4293 .align = __alignof__(struct nft_object *),
4294 },
3ac4c07a
PM		 4295 [NFT_SET_EXT_FLAGS] = {
4296 .len = sizeof(u8),
4297 .align = __alignof__(u8),
4298 },
c3e1b005
PM		 4299 [NFT_SET_EXT_TIMEOUT] = {
4300 .len = sizeof(u64),
4301 .align = __alignof__(u64),
4302 },
4303 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 4304 .len = sizeof(u64),
4305 .align = __alignof__(u64),
c3e1b005 4306 },
68e942e8
PM		 4307 [NFT_SET_EXT_USERDATA] = {
4308 .len = sizeof(struct nft_userdata),
4309 .align = __alignof__(struct nft_userdata),
4310 },
7b225d0b
PNA		 4311 [NFT_SET_EXT_KEY_END] = {
4312 .align = __alignof__(u32),
4313 },
3ac4c07a
PM		 4314};
4315EXPORT_SYMBOL_GPL(nft_set_ext_types);
4316
20a69341
PM		 4317/*
4318 * Set elements
4319 */
4320
4321static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4322 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4323 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4324 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 4325 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
79ebb5bb 4326 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
68e942e8
PM		 4327 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4328 .len = NFT_USERDATA_MAXLEN },
467697d2 4329 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
9332d27d
FW		 4330 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4331 .len = NFT_OBJ_MAXNAMELEN - 1 },
7b225d0b 4332 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
20a69341
PM		 4333};
4334
4335static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 4336 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4337 .len = NFT_TABLE_MAXNAMELEN - 1 },
4338 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4339 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 4340 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 4341 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 4342};
4343
633c9a84 4344static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 4345 const struct sk_buff *skb,
4346 const struct nlmsghdr *nlh,
f2a6d766 4347 const struct nlattr * const nla[],
36dd1bcc 4348 struct netlink_ext_ack *extack,
f2a6d766 4349 u8 genmask)
20a69341
PM		 4350{
4351 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 4352 int family = nfmsg->nfgen_family;
7c95f6d8 4353 struct nft_table *table;
20a69341 4354
cac20fcd
PNA		 4355 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4356 genmask);
36dd1bcc
PNA		 4357 if (IS_ERR(table)) {
4358 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341 4359 return PTR_ERR(table);
36dd1bcc 4360 }
20a69341 4361
98319cb9 4362 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 4363 return 0;
4364}
4365
4366static int nf_tables_fill_setelem(struct sk_buff *skb,
4367 const struct nft_set *set,
4368 const struct nft_set_elem *elem)
4369{
fe2811eb 4370 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4371 unsigned char *b = skb_tail_pointer(skb);
4372 struct nlattr *nest;
4373
ae0be8de 4374 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
20a69341
PM		 4375 if (nest == NULL)
4376 goto nla_put_failure;
4377
fe2811eb
PM		 4378 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4379 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 4380 goto nla_put_failure;
4381
7b225d0b
PNA		 4382 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4383 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4384 NFT_DATA_VALUE, set->klen) < 0)
4385 goto nla_put_failure;
4386
fe2811eb
PM		 4387 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4388 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 4389 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4390 set->dlen) < 0)
4391 goto nla_put_failure;
4392
f25ad2e9
PM		 4393 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4394 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4395 goto nla_put_failure;
4396
8aeff920
PNA		 4397 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4398 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
d152159b 4399 (*nft_set_ext_obj(ext))->key.name) < 0)
8aeff920
PNA		 4400 goto nla_put_failure;
4401
fe2811eb
PM		 4402 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4403 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4404 htonl(*nft_set_ext_flags(ext))))
4405 goto nla_put_failure;
20a69341 4406
c3e1b005
PM		 4407 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4408 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 4409 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 4410 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4411 goto nla_put_failure;
4412
4413 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 4414 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 4415
4416 expires = *nft_set_ext_expiration(ext);
8e1102d5 4417 if (time_before64(now, expires))
c3e1b005
PM		 4418 expires -= now;
4419 else
4420 expires = 0;
4421
4422 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 4423 nf_jiffies64_to_msecs(expires),
b46f6ded 4424 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4425 goto nla_put_failure;
4426 }
4427
68e942e8
PM		 4428 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4429 struct nft_userdata *udata;
4430
4431 udata = nft_set_ext_userdata(ext);
4432 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4433 udata->len + 1, udata->data))
4434 goto nla_put_failure;
4435 }
4436
20a69341
PM		 4437 nla_nest_end(skb, nest);
4438 return 0;
4439
4440nla_put_failure:
4441 nlmsg_trim(skb, b);
4442 return -EMSGSIZE;
4443}
4444
4445struct nft_set_dump_args {
4446 const struct netlink_callback *cb;
4447 struct nft_set_iter iter;
4448 struct sk_buff *skb;
4449};
4450
4451static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 4452 struct nft_set *set,
20a69341 4453 const struct nft_set_iter *iter,
de70185d 4454 struct nft_set_elem *elem)
20a69341
PM		 4455{
4456 struct nft_set_dump_args *args;
4457
4458 args = container_of(iter, struct nft_set_dump_args, iter);
4459 return nf_tables_fill_setelem(args->skb, set, elem);
4460}
4461
fa803605
LZ		 4462struct nft_set_dump_ctx {
4463 const struct nft_set *set;
4464 struct nft_ctx ctx;
4465};
4466
20a69341
PM		 4467static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4468{
fa803605 4469 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 4470 struct net *net = sock_net(skb->sk);
fa803605 4471 struct nft_table *table;
de70185d 4472 struct nft_set *set;
20a69341 4473 struct nft_set_dump_args args;
fa803605 4474 bool set_found = false;
20a69341
PM		 4475 struct nfgenmsg *nfmsg;
4476 struct nlmsghdr *nlh;
4477 struct nlattr *nest;
4478 u32 portid, seq;
fa803605 4479 int event;
20a69341 4480
fa803605 4481 rcu_read_lock();
36596dad
PNA		 4482 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4483 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 4484 dump_ctx->ctx.family != table->family)
fa803605 4485 continue;
20a69341 4486
36596dad
PNA		 4487 if (table != dump_ctx->ctx.table)
4488 continue;
20a69341 4489
36596dad
PNA		 4490 list_for_each_entry_rcu(set, &table->sets, list) {
4491 if (set == dump_ctx->set) {
4492 set_found = true;
4493 break;
fa803605 4494 }
fa803605
LZ		 4495 }
4496 break;
4497 }
4498
4499 if (!set_found) {
4500 rcu_read_unlock();
4501 return -ENOENT;
4502 }
20a69341 4503
dedb67c4 4504 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 4505 portid = NETLINK_CB(cb->skb).portid;
4506 seq = cb->nlh->nlmsg_seq;
4507
4508 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4509 NLM_F_MULTI);
4510 if (nlh == NULL)
4511 goto nla_put_failure;
4512
4513 nfmsg = nlmsg_data(nlh);
98319cb9 4514 nfmsg->nfgen_family = table->family;
20a69341 4515 nfmsg->version = NFNETLINK_V0;
fa803605 4516 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 4517
fa803605 4518 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 4519 goto nla_put_failure;
4520 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4521 goto nla_put_failure;
4522
ae0be8de 4523 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
20a69341
PM		 4524 if (nest == NULL)
4525 goto nla_put_failure;
4526
8588ac09
PNA		 4527 args.cb = cb;
4528 args.skb = skb;
fa803605 4529 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 4530 args.iter.skip = cb->args[0];
4531 args.iter.count = 0;
4532 args.iter.err = 0;
4533 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 4534 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4535 rcu_read_unlock();
20a69341
PM		 4536
4537 nla_nest_end(skb, nest);
4538 nlmsg_end(skb, nlh);
4539
4540 if (args.iter.err && args.iter.err != -EMSGSIZE)
4541 return args.iter.err;
4542 if (args.iter.count == cb->args[0])
4543 return 0;
4544
4545 cb->args[0] = args.iter.count;
4546 return skb->len;
4547
4548nla_put_failure:
fa803605 4549 rcu_read_unlock();
20a69341
PM		 4550 return -ENOSPC;
4551}
4552
90fd131a
FW		 4553static int nf_tables_dump_set_start(struct netlink_callback *cb)
4554{
4555 struct nft_set_dump_ctx *dump_ctx = cb->data;
4556
4557 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4558
4559 return cb->data ? 0 : -ENOMEM;
4560}
4561
fa803605
LZ		 4562static int nf_tables_dump_set_done(struct netlink_callback *cb)
4563{
4564 kfree(cb->data);
4565 return 0;
4566}
4567
d60ce62f
AB		 4568static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4569 const struct nft_ctx *ctx, u32 seq,
4570 u32 portid, int event, u16 flags,
4571 const struct nft_set *set,
4572 const struct nft_set_elem *elem)
4573{
4574 struct nfgenmsg *nfmsg;
4575 struct nlmsghdr *nlh;
4576 struct nlattr *nest;
4577 int err;
4578
dedb67c4 4579 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 4580 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4581 flags);
4582 if (nlh == NULL)
4583 goto nla_put_failure;
4584
4585 nfmsg = nlmsg_data(nlh);
36596dad 4586 nfmsg->nfgen_family = ctx->family;
d60ce62f 4587 nfmsg->version = NFNETLINK_V0;
84d7fce6 4588 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 4589
4590 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4591 goto nla_put_failure;
4592 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4593 goto nla_put_failure;
4594
ae0be8de 4595 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
d60ce62f
AB		 4596 if (nest == NULL)
4597 goto nla_put_failure;
4598
4599 err = nf_tables_fill_setelem(skb, set, elem);
4600 if (err < 0)
4601 goto nla_put_failure;
4602
4603 nla_nest_end(skb, nest);
4604
053c095a
JB		 4605 nlmsg_end(skb, nlh);
4606 return 0;
d60ce62f
AB		 4607
4608nla_put_failure:
4609 nlmsg_trim(skb, nlh);
4610 return -1;
4611}
4612
ba0e4d99
PNA		 4613static int nft_setelem_parse_flags(const struct nft_set *set,
4614 const struct nlattr *attr, u32 *flags)
4615{
4616 if (attr == NULL)
4617 return 0;
4618
4619 *flags = ntohl(nla_get_be32(attr));
4620 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4621 return -EINVAL;
4622 if (!(set->flags & NFT_SET_INTERVAL) &&
4623 *flags & NFT_SET_ELEM_INTERVAL_END)
4624 return -EINVAL;
4625
4626 return 0;
4627}
4628
20a1452c
PNA		 4629static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4630 struct nft_data *key, struct nlattr *attr)
4631{
4632 struct nft_data_desc desc;
4633 int err;
4634
4635 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4636 if (err < 0)
4637 return err;
4638
4639 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4640 nft_data_release(key, desc.type);
4641 return -EINVAL;
4642 }
4643
4644 return 0;
4645}
4646
ba0e4d99
PNA		 4647static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4648 const struct nlattr *attr)
4649{
4650 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 4651 struct nft_set_elem elem;
4652 struct sk_buff *skb;
4653 uint32_t flags = 0;
4654 void *priv;
4655 int err;
4656
8cb08174
JB		 4657 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4658 nft_set_elem_policy, NULL);
ba0e4d99
PNA		 4659 if (err < 0)
4660 return err;
4661
4662 if (!nla[NFTA_SET_ELEM_KEY])
4663 return -EINVAL;
4664
4665 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4666 if (err < 0)
4667 return err;
4668
20a1452c
PNA		 4669 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4670 nla[NFTA_SET_ELEM_KEY]);
ba0e4d99
PNA		 4671 if (err < 0)
4672 return err;
4673
7b225d0b
PNA		 4674 if (nla[NFTA_SET_ELEM_KEY_END]) {
4675 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4676 nla[NFTA_SET_ELEM_KEY_END]);
4677 if (err < 0)
4678 return err;
4679 }
4680
ba0e4d99
PNA		 4681 priv = set->ops->get(ctx->net, set, &elem, flags);
4682 if (IS_ERR(priv))
4683 return PTR_ERR(priv);
4684
4685 elem.priv = priv;
ba0e4d99
PNA		 4686
4687 err = -ENOMEM;
d9adf22a 4688 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99
PNA		 4689 if (skb == NULL)
4690 goto err1;
4691
4692 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4693 NFT_MSG_NEWSETELEM, 0, set, &elem);
4694 if (err < 0)
4695 goto err2;
4696
4697 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4698 /* This avoids a loop in nfnetlink. */
4699 if (err < 0)
4700 goto err1;
4701
4702 return 0;
4703err2:
4704 kfree_skb(skb);
4705err1:
4706 /* this avoids a loop in nfnetlink. */
4707 return err == -EAGAIN ? -ENOBUFS : err;
4708}
4709
d9adf22a 4710/* called with rcu_read_lock held */
ba0e4d99
PNA		 4711static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4712 struct sk_buff *skb, const struct nlmsghdr *nlh,
4713 const struct nlattr * const nla[],
4714 struct netlink_ext_ack *extack)
4715{
4716 u8 genmask = nft_genmask_cur(net);
4717 struct nft_set *set;
4718 struct nlattr *attr;
4719 struct nft_ctx ctx;
4720 int rem, err = 0;
4721
36dd1bcc
PNA		 4722 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4723 genmask);
ba0e4d99
PNA		 4724 if (err < 0)
4725 return err;
4726
cac20fcd 4727 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 4728 if (IS_ERR(set))
4729 return PTR_ERR(set);
4730
4731 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4732 struct netlink_dump_control c = {
90fd131a 4733 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 4734 .dump = nf_tables_dump_set,
4735 .done = nf_tables_dump_set_done,
d9adf22a 4736 .module = THIS_MODULE,
ba0e4d99 4737 };
90fd131a
FW		 4738 struct nft_set_dump_ctx dump_ctx = {
4739 .set = set,
4740 .ctx = ctx,
4741 };
ba0e4d99 4742
90fd131a 4743 c.data = &dump_ctx;
d9adf22a 4744 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
ba0e4d99
PNA		 4745 }
4746
4747 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4748 return -EINVAL;
4749
4750 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4751 err = nft_get_set_elem(&ctx, set, attr);
4752 if (err < 0)
4753 break;
4754 }
4755
4756 return err;
4757}
4758
25e94a99
PNA		 4759static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4760 const struct nft_set *set,
4761 const struct nft_set_elem *elem,
4762 int event, u16 flags)
d60ce62f 4763{
128ad332
PNA		 4764 struct net *net = ctx->net;
4765 u32 portid = ctx->portid;
d60ce62f
AB		 4766 struct sk_buff *skb;
4767 int err;
4768
128ad332 4769 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4770 return;
d60ce62f 4771
d60ce62f
AB		 4772 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4773 if (skb == NULL)
4774 goto err;
4775
4776 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4777 set, elem);
4778 if (err < 0) {
4779 kfree_skb(skb);
4780 goto err;
4781 }
4782
25e94a99
PNA		 4783 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4784 GFP_KERNEL);
4785 return;
d60ce62f 4786err:
25e94a99 4787 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 4788}
4789
60319eb1
PNA		 4790static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4791 int msg_type,
4792 struct nft_set *set)
4793{
4794 struct nft_trans *trans;
4795
4796 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4797 if (trans == NULL)
4798 return NULL;
4799
4800 nft_trans_elem_set(trans) = set;
4801 return trans;
4802}
4803
22fe54d5
PM		 4804void *nft_set_elem_init(const struct nft_set *set,
4805 const struct nft_set_ext_tmpl *tmpl,
7b225d0b
PNA		 4806 const u32 *key, const u32 *key_end,
4807 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
fe2811eb
PM		 4808{
4809 struct nft_set_ext *ext;
4810 void *elem;
4811
4812 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4813 if (elem == NULL)
4814 return NULL;
4815
4816 ext = nft_set_elem_ext(set, elem);
4817 nft_set_ext_init(ext, tmpl);
4818
4819 memcpy(nft_set_ext_key(ext), key, set->klen);
7b225d0b
PNA		 4820 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
4821 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
fe2811eb
PM		 4822 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4823 memcpy(nft_set_ext_data(ext), data, set->dlen);
79ebb5bb
LGL		 4824 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4825 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4826 if (expiration == 0)
4827 *nft_set_ext_expiration(ext) += timeout;
4828 }
c3e1b005
PM		 4829 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4830 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 4831
4832 return elem;
4833}
4834
61f9e292
LZ		 4835void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4836 bool destroy_expr)
61edafbb
PM		 4837{
4838 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 4839 struct nft_ctx ctx = {
4840 .net = read_pnet(&set->net),
4841 .family = set->table->family,
4842 };
61edafbb 4843
59105446 4844 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 4845 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 4846 nft_data_release(nft_set_ext_data(ext), set->dtype);
371ebcbb
PNA		 4847 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR)) {
4848 struct nft_expr *expr = nft_set_ext_expr(ext);
4849
4850 if (expr->ops->destroy_clone) {
4851 expr->ops->destroy_clone(&ctx, expr);
4852 module_put(expr->ops->type->owner);
4853 } else {
4854 nf_tables_expr_destroy(&ctx, expr);
4855 }
4856 }
8aeff920
PNA		 4857 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4858 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 4859 kfree(elem);
4860}
4861EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4862
59105446
PNA		 4863/* Only called from commit path, nft_set_elem_deactivate() already deals with
4864 * the refcounting from the preparation phase.
4865 */
3453c927
PNA		 4866static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4867 const struct nft_set *set, void *elem)
59105446
PNA		 4868{
4869 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4870
4871 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3453c927 4872 nf_tables_expr_destroy(ctx, nft_set_ext_expr(ext));
59105446
PNA		 4873 kfree(elem);
4874}
4875
60319eb1 4876static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 4877 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 4878{
4879 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 4880 u8 genmask = nft_genmask_next(ctx->net);
fe2811eb 4881 struct nft_set_ext_tmpl tmpl;
c016c7e4 4882 struct nft_set_ext *ext, *ext2;
20a69341
PM		 4883 struct nft_set_elem elem;
4884 struct nft_set_binding *binding;
8aeff920 4885 struct nft_object *obj = NULL;
68e942e8 4886 struct nft_userdata *udata;
20a1452c 4887 struct nft_data_desc desc;
fe2811eb 4888 struct nft_data data;
20a69341 4889 enum nft_registers dreg;
60319eb1 4890 struct nft_trans *trans;
0e9091d6 4891 u32 flags = 0;
c3e1b005 4892 u64 timeout;
79ebb5bb 4893 u64 expiration;
68e942e8 4894 u8 ulen;
20a69341
PM		 4895 int err;
4896
8cb08174
JB		 4897 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4898 nft_set_elem_policy, NULL);
20a69341
PM		 4899 if (err < 0)
4900 return err;
4901
4902 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4903 return -EINVAL;
4904
fe2811eb
PM		 4905 nft_set_ext_prepare(&tmpl);
4906
0e9091d6
PNA		 4907 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4908 if (err < 0)
4909 return err;
4910 if (flags != 0)
4911 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 4912
4913 if (set->flags & NFT_SET_MAP) {
4914 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 4915 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341
PM		 4916 return -EINVAL;
4917 } else {
4918 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4919 return -EINVAL;
4920 }
4921
bffc124b
PNA		 4922 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
4923 (nla[NFTA_SET_ELEM_DATA] ||
4924 nla[NFTA_SET_ELEM_OBJREF] ||
4925 nla[NFTA_SET_ELEM_TIMEOUT] ||
4926 nla[NFTA_SET_ELEM_EXPIRATION] ||
4927 nla[NFTA_SET_ELEM_USERDATA] ||
4928 nla[NFTA_SET_ELEM_EXPR]))
4929 return -EINVAL;
4930
c3e1b005
PM		 4931 timeout = 0;
4932 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
4933 if (!(set->flags & NFT_SET_TIMEOUT))
4934 return -EINVAL;
8e1102d5
FW		 4935 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
4936 &timeout);
4937 if (err)
4938 return err;
c3e1b005
PM		 4939 } else if (set->flags & NFT_SET_TIMEOUT) {
4940 timeout = set->timeout;
4941 }
4942
79ebb5bb
LGL		 4943 expiration = 0;
4944 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
4945 if (!(set->flags & NFT_SET_TIMEOUT))
4946 return -EINVAL;
4947 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
4948 &expiration);
4949 if (err)
4950 return err;
4951 }
4952
20a1452c
PNA		 4953 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4954 nla[NFTA_SET_ELEM_KEY]);
20a69341 4955 if (err < 0)
7b225d0b 4956 return err;
20a69341 4957
20a1452c 4958 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7b225d0b
PNA		 4959
4960 if (nla[NFTA_SET_ELEM_KEY_END]) {
4961 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4962 nla[NFTA_SET_ELEM_KEY_END]);
4963 if (err < 0)
4964 goto err_parse_key;
4965
4966 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
4967 }
4968
c3e1b005
PM		 4969 if (timeout > 0) {
4970 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
4971 if (timeout != set->timeout)
4972 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
4973 }
fe2811eb 4974
8aeff920
PNA		 4975 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
4976 if (!(set->flags & NFT_SET_OBJECT)) {
4977 err = -EINVAL;
7b225d0b 4978 goto err_parse_key_end;
8aeff920 4979 }
4d44175a
FW		 4980 obj = nft_obj_lookup(ctx->net, ctx->table,
4981 nla[NFTA_SET_ELEM_OBJREF],
cac20fcd 4982 set->objtype, genmask);
8aeff920
PNA		 4983 if (IS_ERR(obj)) {
4984 err = PTR_ERR(obj);
7b225d0b 4985 goto err_parse_key_end;
8aeff920
PNA		 4986 }
4987 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
4988 }
4989
20a69341 4990 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
20a1452c 4991 err = nft_data_init(ctx, &data, sizeof(data), &desc,
d0a11fc3 4992 nla[NFTA_SET_ELEM_DATA]);
20a69341 4993 if (err < 0)
7b225d0b 4994 goto err_parse_key_end;
20a69341
PM		 4995
4996 err = -EINVAL;
20a1452c 4997 if (set->dtype != NFT_DATA_VERDICT && desc.len != set->dlen)
7b225d0b 4998 goto err_parse_data;
20a69341
PM		 4999
5000 dreg = nft_type_to_reg(set->dtype);
5001 list_for_each_entry(binding, &set->bindings, list) {
5002 struct nft_ctx bind_ctx = {
58c78e10 5003 .net = ctx->net,
36596dad 5004 .family = ctx->family,
20a69341 5005 .table = ctx->table,
7c95f6d8 5006 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 5007 };
5008
11113e19
PM		 5009 if (!(binding->flags & NFT_SET_MAP))
5010 continue;
5011
1ec10212
PM		 5012 err = nft_validate_register_store(&bind_ctx, dreg,
5013 &data,
20a1452c 5014 desc.type, desc.len);
20a69341 5015 if (err < 0)
7b225d0b 5016 goto err_parse_data;
a654de8f 5017
20a1452c 5018 if (desc.type == NFT_DATA_VERDICT &&
a654de8f
PNA		 5019 (data.verdict.code == NFT_GOTO ||
5020 data.verdict.code == NFT_JUMP))
5021 nft_validate_state_update(ctx->net,
5022 NFT_VALIDATE_NEED);
20a69341 5023 }
fe2811eb 5024
20a1452c 5025 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
20a69341
PM		 5026 }
5027
68e942e8
PM		 5028 /* The full maximum length of userdata can exceed the maximum
5029 * offset value (U8_MAX) for following extensions, therefor it
5030 * must be the last extension added.
5031 */
5032 ulen = 0;
5033 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5034 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5035 if (ulen > 0)
5036 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5037 ulen);
5038 }
5039
fe2811eb 5040 err = -ENOMEM;
7b225d0b
PNA		 5041 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5042 elem.key_end.val.data, data.data,
79ebb5bb 5043 timeout, expiration, GFP_KERNEL);
fe2811eb 5044 if (elem.priv == NULL)
7b225d0b 5045 goto err_parse_data;
fe2811eb
PM		 5046
5047 ext = nft_set_elem_ext(set, elem.priv);
5048 if (flags)
5049 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 5050 if (ulen > 0) {
5051 udata = nft_set_ext_userdata(ext);
5052 udata->len = ulen - 1;
5053 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5054 }
8aeff920
PNA		 5055 if (obj) {
5056 *nft_set_ext_obj(ext) = obj;
5057 obj->use++;
5058 }
fe2811eb 5059
60319eb1
PNA		 5060 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5061 if (trans == NULL)
7b225d0b 5062 goto err_trans;
60319eb1 5063
69086658 5064 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 5065 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5066 if (err) {
5067 if (err == -EEXIST) {
9744a6fc
PNA		 5068 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5069 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5070 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
f0dfd7a2
CIK		 5071 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
5072 err = -EBUSY;
7b225d0b 5073 goto err_element_clash;
f0dfd7a2 5074 }
8aeff920
PNA		 5075 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5076 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5077 memcmp(nft_set_ext_data(ext),
5078 nft_set_ext_data(ext2), set->dlen) != 0) ||
5079 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5080 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5081 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 5082 err = -EBUSY;
5083 else if (!(nlmsg_flags & NLM_F_EXCL))
5084 err = 0;
5085 }
7b225d0b 5086 goto err_element_clash;
c016c7e4 5087 }
20a69341 5088
35d0ac90
PNA		 5089 if (set->size &&
5090 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5091 err = -ENFILE;
7b225d0b 5092 goto err_set_full;
35d0ac90
PNA		 5093 }
5094
60319eb1 5095 nft_trans_elem(trans) = elem;
46bbafce 5096 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 5097 return 0;
5098
7b225d0b 5099err_set_full:
5cb82a38 5100 set->ops->remove(ctx->net, set, &elem);
7b225d0b 5101err_element_clash:
60319eb1 5102 kfree(trans);
7b225d0b 5103err_trans:
b91d9036
TY		 5104 if (obj)
5105 obj->use--;
fe2811eb 5106 kfree(elem.priv);
7b225d0b 5107err_parse_data:
20a69341 5108 if (nla[NFTA_SET_ELEM_DATA] != NULL)
20a1452c 5109 nft_data_release(&data, desc.type);
7b225d0b
PNA		 5110err_parse_key_end:
5111 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5112err_parse_key:
20a1452c 5113 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7b225d0b 5114
20a69341
PM		 5115 return err;
5116}
5117
633c9a84
PNA		 5118static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5119 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5120 const struct nlattr * const nla[],
5121 struct netlink_ext_ack *extack)
20a69341 5122{
f2a6d766 5123 u8 genmask = nft_genmask_next(net);
20a69341
PM		 5124 const struct nlattr *attr;
5125 struct nft_set *set;
5126 struct nft_ctx ctx;
a654de8f 5127 int rem, err;
20a69341 5128
7d5570ca
PNA		 5129 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5130 return -EINVAL;
5131
36dd1bcc
PNA		 5132 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5133 genmask);
20a69341
PM		 5134 if (err < 0)
5135 return err;
5136
a3073c17
PNA		 5137 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5138 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5139 if (IS_ERR(set))
5140 return PTR_ERR(set);
958bee14 5141
20a69341
PM		 5142 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5143 return -EBUSY;
5144
5145 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 5146 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 5147 if (err < 0)
a654de8f 5148 return err;
20a69341 5149 }
a654de8f
PNA		 5150
5151 if (net->nft.validate_state == NFT_VALIDATE_DO)
5152 return nft_table_validate(net, ctx.table);
5153
5154 return 0;
20a69341
PM		 5155}
5156
59105446
PNA		 5157/**
5158 * nft_data_hold - hold a nft_data item
5159 *
5160 * @data: struct nft_data to release
5161 * @type: type of data
5162 *
5163 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5164 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5165 * NFT_GOTO verdicts. This function must be called on active data objects
5166 * from the second phase of the commit protocol.
5167 */
bb7b40ae 5168void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446
PNA		 5169{
5170 if (type == NFT_DATA_VERDICT) {
5171 switch (data->verdict.code) {
5172 case NFT_JUMP:
5173 case NFT_GOTO:
5174 data->verdict.chain->use++;
5175 break;
5176 }
5177 }
5178}
5179
5180static void nft_set_elem_activate(const struct net *net,
5181 const struct nft_set *set,
5182 struct nft_set_elem *elem)
5183{
5184 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5185
5186 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5187 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5188 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5189 (*nft_set_ext_obj(ext))->use++;
5190}
5191
5192static void nft_set_elem_deactivate(const struct net *net,
5193 const struct nft_set *set,
5194 struct nft_set_elem *elem)
5195{
5196 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5197
5198 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5199 nft_data_release(nft_set_ext_data(ext), set->dtype);
5200 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5201 (*nft_set_ext_obj(ext))->use--;
5202}
5203
60319eb1 5204static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 5205 const struct nlattr *attr)
5206{
5207 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 5208 struct nft_set_ext_tmpl tmpl;
20a69341 5209 struct nft_set_elem elem;
3971ca14 5210 struct nft_set_ext *ext;
60319eb1 5211 struct nft_trans *trans;
3971ca14
PNA		 5212 u32 flags = 0;
5213 void *priv;
20a69341
PM		 5214 int err;
5215
8cb08174
JB		 5216 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5217 nft_set_elem_policy, NULL);
20a69341 5218 if (err < 0)
20a1452c 5219 return err;
20a69341 5220
20a69341 5221 if (nla[NFTA_SET_ELEM_KEY] == NULL)
20a1452c 5222 return -EINVAL;
20a69341 5223
3971ca14
PNA		 5224 nft_set_ext_prepare(&tmpl);
5225
5226 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5227 if (err < 0)
5228 return err;
5229 if (flags != 0)
5230 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5231
20a1452c
PNA		 5232 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5233 nla[NFTA_SET_ELEM_KEY]);
20a69341 5234 if (err < 0)
20a1452c 5235 return err;
20a69341 5236
20a1452c 5237 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
3971ca14 5238
7b225d0b
PNA		 5239 if (nla[NFTA_SET_ELEM_KEY_END]) {
5240 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5241 nla[NFTA_SET_ELEM_KEY_END]);
5242 if (err < 0)
5243 return err;
5244
5245 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5246 }
5247
3971ca14 5248 err = -ENOMEM;
7b225d0b
PNA		 5249 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5250 elem.key_end.val.data, NULL, 0, 0,
5251 GFP_KERNEL);
3971ca14 5252 if (elem.priv == NULL)
20a1452c 5253 goto fail_elem;
3971ca14
PNA		 5254
5255 ext = nft_set_elem_ext(set, elem.priv);
5256 if (flags)
5257 *nft_set_ext_flags(ext) = flags;
5258
60319eb1 5259 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
20a1452c
PNA		 5260 if (trans == NULL)
5261 goto fail_trans;
20a69341 5262
42a55769 5263 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 5264 if (priv == NULL) {
cc02e457 5265 err = -ENOENT;
20a1452c 5266 goto fail_ops;
cc02e457 5267 }
3971ca14
PNA		 5268 kfree(elem.priv);
5269 elem.priv = priv;
cc02e457 5270
59105446
PNA		 5271 nft_set_elem_deactivate(ctx->net, set, &elem);
5272
60319eb1 5273 nft_trans_elem(trans) = elem;
46bbafce 5274 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 5275 return 0;
cc02e457 5276
20a1452c 5277fail_ops:
cc02e457 5278 kfree(trans);
20a1452c 5279fail_trans:
3971ca14 5280 kfree(elem.priv);
20a1452c
PNA		 5281fail_elem:
5282 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
20a69341
PM		 5283 return err;
5284}
5285
8411b644 5286static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 5287 struct nft_set *set,
8411b644 5288 const struct nft_set_iter *iter,
de70185d 5289 struct nft_set_elem *elem)
8411b644
PNA		 5290{
5291 struct nft_trans *trans;
5292 int err;
5293
5294 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5295 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5296 if (!trans)
5297 return -ENOMEM;
5298
1ba1c414 5299 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 5300 err = -ENOENT;
5301 goto err1;
5302 }
b2c11e4b 5303 set->ndeact++;
8411b644 5304
7acfda53 5305 nft_set_elem_deactivate(ctx->net, set, elem);
de70185d
PNA		 5306 nft_trans_elem_set(trans) = set;
5307 nft_trans_elem(trans) = *elem;
8411b644
PNA		 5308 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5309
5310 return 0;
5311err1:
5312 kfree(trans);
5313 return err;
5314}
5315
633c9a84
PNA		 5316static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5317 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5318 const struct nlattr * const nla[],
5319 struct netlink_ext_ack *extack)
20a69341 5320{
f2a6d766 5321 u8 genmask = nft_genmask_next(net);
20a69341
PM		 5322 const struct nlattr *attr;
5323 struct nft_set *set;
5324 struct nft_ctx ctx;
60319eb1 5325 int rem, err = 0;
20a69341 5326
36dd1bcc
PNA		 5327 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5328 genmask);
20a69341
PM		 5329 if (err < 0)
5330 return err;
5331
cac20fcd 5332 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 5333 if (IS_ERR(set))
5334 return PTR_ERR(set);
5335 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5336 return -EBUSY;
5337
8411b644 5338 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 5339 struct nft_set_iter iter = {
5340 .genmask = genmask,
5341 .fn = nft_flush_set,
8411b644 5342 };
baa2d42c 5343 set->ops->walk(&ctx, set, &iter);
8411b644 5344
baa2d42c 5345 return iter.err;
8411b644
PNA		 5346 }
5347
20a69341
PM		 5348 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5349 err = nft_del_setelem(&ctx, set, attr);
5350 if (err < 0)
60319eb1 5351 break;
4fefee57 5352
3dd0673a 5353 set->ndeact++;
20a69341 5354 }
60319eb1 5355 return err;
20a69341
PM		 5356}
5357
cfed7e1b
PM		 5358void nft_set_gc_batch_release(struct rcu_head *rcu)
5359{
5360 struct nft_set_gc_batch *gcb;
5361 unsigned int i;
5362
5363 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5364 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 5365 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 5366 kfree(gcb);
5367}
5368EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
5369
5370struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5371 gfp_t gfp)
5372{
5373 struct nft_set_gc_batch *gcb;
5374
5375 gcb = kzalloc(sizeof(*gcb), gfp);
5376 if (gcb == NULL)
5377 return gcb;
5378 gcb->head.set = set;
5379 return gcb;
5380}
5381EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
5382
e5009240
PNA		 5383/*
5384 * Stateful objects
5385 */
5386
5387/**
5388 * nft_register_obj- register nf_tables stateful object type
5389 * @obj: object type
5390 *
5391 * Registers the object type for use with nf_tables. Returns zero on
5392 * success or a negative errno code otherwise.
5393 */
5394int nft_register_obj(struct nft_object_type *obj_type)
5395{
5396 if (obj_type->type == NFT_OBJECT_UNSPEC)
5397 return -EINVAL;
5398
5399 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5400 list_add_rcu(&obj_type->list, &nf_tables_objects);
5401 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5402 return 0;
5403}
5404EXPORT_SYMBOL_GPL(nft_register_obj);
5405
5406/**
5407 * nft_unregister_obj - unregister nf_tables object type
5408 * @obj: object type
5409 *
5410 * Unregisters the object type for use with nf_tables.
5411 */
5412void nft_unregister_obj(struct nft_object_type *obj_type)
5413{
5414 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5415 list_del_rcu(&obj_type->list);
5416 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5417}
5418EXPORT_SYMBOL_GPL(nft_unregister_obj);
5419
4d44175a
FW		 5420struct nft_object *nft_obj_lookup(const struct net *net,
5421 const struct nft_table *table,
cac20fcd
PNA		 5422 const struct nlattr *nla, u32 objtype,
5423 u8 genmask)
e5009240 5424{
4d44175a
FW		 5425 struct nft_object_hash_key k = { .table = table };
5426 char search[NFT_OBJ_MAXNAMELEN];
5427 struct rhlist_head *tmp, *list;
e5009240
PNA		 5428 struct nft_object *obj;
5429
4d44175a
FW		 5430 nla_strlcpy(search, nla, sizeof(search));
5431 k.name = search;
5432
5433 WARN_ON_ONCE(!rcu_read_lock_held() &&
5434 !lockdep_commit_lock_is_held(net));
5435
5436 rcu_read_lock();
5437 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5438 if (!list)
5439 goto out;
5440
5441 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5442 if (objtype == obj->ops->type->type &&
5443 nft_active_genmask(obj, genmask)) {
5444 rcu_read_unlock();
e5009240 5445 return obj;
4d44175a 5446 }
e5009240 5447 }
4d44175a
FW		 5448out:
5449 rcu_read_unlock();
e5009240
PNA		 5450 return ERR_PTR(-ENOENT);
5451}
cac20fcd 5452EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 5453
cac20fcd
PNA		 5454static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5455 const struct nlattr *nla,
5456 u32 objtype, u8 genmask)
3ecbfd65
HS		 5457{
5458 struct nft_object *obj;
5459
5460 list_for_each_entry(obj, &table->objects, list) {
5461 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5462 objtype == obj->ops->type->type &&
5463 nft_active_genmask(obj, genmask))
5464 return obj;
5465 }
5466 return ERR_PTR(-ENOENT);
5467}
5468
e5009240 5469static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 5470 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5471 .len = NFT_TABLE_MAXNAMELEN - 1 },
5472 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5473 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 5474 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5475 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 5476 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
e5009240
PNA		 5477};
5478
84fba055
FW		 5479static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5480 const struct nft_object_type *type,
e5009240
PNA		 5481 const struct nlattr *attr)
5482{
5b4c6e38 5483 struct nlattr **tb;
dfc46034 5484 const struct nft_object_ops *ops;
e5009240 5485 struct nft_object *obj;
5b4c6e38
GS		 5486 int err = -ENOMEM;
5487
5488 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5489 if (!tb)
5490 goto err1;
e5009240
PNA		 5491
5492 if (attr) {
8cb08174
JB		 5493 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5494 type->policy, NULL);
e5009240 5495 if (err < 0)
5b4c6e38 5496 goto err2;
e5009240
PNA		 5497 } else {
5498 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5499 }
5500
dfc46034
PBG		 5501 if (type->select_ops) {
5502 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5503 if (IS_ERR(ops)) {
5504 err = PTR_ERR(ops);
5b4c6e38 5505 goto err2;
dfc46034
PBG		 5506 }
5507 } else {
5508 ops = type->ops;
5509 }
5510
e5009240 5511 err = -ENOMEM;
dfc46034 5512 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5b4c6e38
GS		 5513 if (!obj)
5514 goto err2;
e5009240 5515
dfc46034 5516 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 5517 if (err < 0)
5b4c6e38 5518 goto err3;
e5009240 5519
dfc46034
PBG		 5520 obj->ops = ops;
5521
5b4c6e38 5522 kfree(tb);
e5009240 5523 return obj;
5b4c6e38 5524err3:
e5009240 5525 kfree(obj);
5b4c6e38
GS		 5526err2:
5527 kfree(tb);
e5009240
PNA		 5528err1:
5529 return ERR_PTR(err);
5530}
5531
5532static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 5533 struct nft_object *obj, bool reset)
e5009240
PNA		 5534{
5535 struct nlattr *nest;
5536
ae0be8de 5537 nest = nla_nest_start_noflag(skb, attr);
e5009240
PNA		 5538 if (!nest)
5539 goto nla_put_failure;
dfc46034 5540 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 5541 goto nla_put_failure;
5542 nla_nest_end(skb, nest);
5543 return 0;
5544
5545nla_put_failure:
5546 return -1;
5547}
5548
5549static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5550{
5551 const struct nft_object_type *type;
5552
5553 list_for_each_entry(type, &nf_tables_objects, list) {
5554 if (objtype == type->type)
5555 return type;
5556 }
5557 return NULL;
5558}
5559
452238e8
FW		 5560static const struct nft_object_type *
5561nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 5562{
5563 const struct nft_object_type *type;
5564
5565 type = __nft_obj_type_get(objtype);
5566 if (type != NULL && try_module_get(type->owner))
5567 return type;
5568
f102d66b 5569 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 5570#ifdef CONFIG_MODULES
5571 if (type == NULL) {
eb014de4 5572 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
e5009240
PNA		 5573 return ERR_PTR(-EAGAIN);
5574 }
5575#endif
5576 return ERR_PTR(-ENOENT);
5577}
5578
d62d0ba9
FFM		 5579static int nf_tables_updobj(const struct nft_ctx *ctx,
5580 const struct nft_object_type *type,
5581 const struct nlattr *attr,
5582 struct nft_object *obj)
5583{
5584 struct nft_object *newobj;
5585 struct nft_trans *trans;
5586 int err;
5587
5588 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5589 sizeof(struct nft_trans_obj));
5590 if (!trans)
5591 return -ENOMEM;
5592
5593 newobj = nft_obj_init(ctx, type, attr);
5594 if (IS_ERR(newobj)) {
5595 err = PTR_ERR(newobj);
b74ae961 5596 goto err_free_trans;
d62d0ba9
FFM		 5597 }
5598
5599 nft_trans_obj(trans) = obj;
5600 nft_trans_obj_update(trans) = true;
5601 nft_trans_obj_newobj(trans) = newobj;
5602 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5603
5604 return 0;
b74ae961
DC		 5605
5606err_free_trans:
d62d0ba9 5607 kfree(trans);
d62d0ba9
FFM		 5608 return err;
5609}
5610
e5009240
PNA		 5611static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5612 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5613 const struct nlattr * const nla[],
5614 struct netlink_ext_ack *extack)
e5009240
PNA		 5615{
5616 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5617 const struct nft_object_type *type;
5618 u8 genmask = nft_genmask_next(net);
5619 int family = nfmsg->nfgen_family;
e5009240
PNA		 5620 struct nft_table *table;
5621 struct nft_object *obj;
5622 struct nft_ctx ctx;
5623 u32 objtype;
5624 int err;
5625
5626 if (!nla[NFTA_OBJ_TYPE] ||
5627 !nla[NFTA_OBJ_NAME] ||
5628 !nla[NFTA_OBJ_DATA])
5629 return -EINVAL;
5630
cac20fcd 5631 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5632 if (IS_ERR(table)) {
5633 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5634 return PTR_ERR(table);
36dd1bcc 5635 }
e5009240
PNA		 5636
5637 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 5638 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 5639 if (IS_ERR(obj)) {
5640 err = PTR_ERR(obj);
36dd1bcc
PNA		 5641 if (err != -ENOENT) {
5642 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5643 return err;
36dd1bcc 5644 }
1a28ad74 5645 } else {
36dd1bcc
PNA		 5646 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5647 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5648 return -EEXIST;
36dd1bcc 5649 }
d62d0ba9
FFM		 5650 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5651 return -EOPNOTSUPP;
5652
fd57d0cb 5653 type = __nft_obj_type_get(objtype);
d62d0ba9
FFM		 5654 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5655
5656 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
e5009240
PNA		 5657 }
5658
98319cb9 5659 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240 5660
452238e8 5661 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 5662 if (IS_ERR(type))
5663 return PTR_ERR(type);
5664
84fba055 5665 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 5666 if (IS_ERR(obj)) {
5667 err = PTR_ERR(obj);
5668 goto err1;
5669 }
d152159b 5670 obj->key.table = table;
3ecbfd65
HS		 5671 obj->handle = nf_tables_alloc_handle(table);
5672
d152159b
FW		 5673 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5674 if (!obj->key.name) {
61509575
PS		 5675 err = -ENOMEM;
5676 goto err2;
5677 }
e5009240
PNA		 5678
5679 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5680 if (err < 0)
61509575 5681 goto err3;
e5009240 5682
4d44175a
FW		 5683 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5684 nft_objname_ht_params);
5685 if (err < 0)
5686 goto err4;
5687
e5009240
PNA		 5688 list_add_tail_rcu(&obj->list, &table->objects);
5689 table->use++;
5690 return 0;
4d44175a
FW		 5691err4:
5692 /* queued in transaction log */
5693 INIT_LIST_HEAD(&obj->list);
5694 return err;
61509575 5695err3:
d152159b 5696 kfree(obj->key.name);
e5009240 5697err2:
dfc46034 5698 if (obj->ops->destroy)
00bfb320 5699 obj->ops->destroy(&ctx, obj);
e5009240
PNA		 5700 kfree(obj);
5701err1:
5702 module_put(type->owner);
5703 return err;
5704}
5705
5706static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5707 u32 portid, u32 seq, int event, u32 flags,
5708 int family, const struct nft_table *table,
43da04a5 5709 struct nft_object *obj, bool reset)
e5009240
PNA		 5710{
5711 struct nfgenmsg *nfmsg;
5712 struct nlmsghdr *nlh;
5713
dedb67c4 5714 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 5715 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5716 if (nlh == NULL)
5717 goto nla_put_failure;
5718
5719 nfmsg = nlmsg_data(nlh);
5720 nfmsg->nfgen_family = family;
5721 nfmsg->version = NFNETLINK_V0;
5722 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5723
5724 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
d152159b 5725 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
dfc46034 5726 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 5727 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 5728 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5729 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5730 NFTA_OBJ_PAD))
e5009240
PNA		 5731 goto nla_put_failure;
5732
5733 nlmsg_end(skb, nlh);
5734 return 0;
5735
5736nla_put_failure:
5737 nlmsg_trim(skb, nlh);
5738 return -1;
5739}
5740
a9fea2a3 5741struct nft_obj_filter {
e46abbcc 5742 char *table;
a9fea2a3
PNA		 5743 u32 type;
5744};
5745
e5009240
PNA		 5746static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5747{
5748 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 5749 const struct nft_table *table;
e5009240 5750 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 5751 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 5752 struct net *net = sock_net(skb->sk);
5753 int family = nfmsg->nfgen_family;
43da04a5
PNA		 5754 struct nft_object *obj;
5755 bool reset = false;
5756
5757 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5758 reset = true;
e5009240
PNA		 5759
5760 rcu_read_lock();
5761 cb->seq = net->nft.base_seq;
5762
36596dad 5763 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 5764 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 5765 continue;
5766
36596dad
PNA		 5767 list_for_each_entry_rcu(obj, &table->objects, list) {
5768 if (!nft_is_active(net, obj))
5769 goto cont;
5770 if (idx < s_idx)
5771 goto cont;
5772 if (idx > s_idx)
5773 memset(&cb->args[1], 0,
5774 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 5775 if (filter && filter->table &&
36596dad
PNA		 5776 strcmp(filter->table, table->name))
5777 goto cont;
5778 if (filter &&
5779 filter->type != NFT_OBJECT_UNSPEC &&
5780 obj->ops->type->type != filter->type)
5781 goto cont;
a9fea2a3 5782
36596dad
PNA		 5783 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5784 cb->nlh->nlmsg_seq,
5785 NFT_MSG_NEWOBJ,
5786 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 5787 table->family, table,
36596dad
PNA		 5788 obj, reset) < 0)
5789 goto done;
e5009240 5790
36596dad 5791 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 5792cont:
36596dad 5793 idx++;
e5009240
PNA		 5794 }
5795 }
5796done:
5797 rcu_read_unlock();
5798
5799 cb->args[0] = idx;
5800 return skb->len;
5801}
5802
90fd131a 5803static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 5804{
90fd131a
FW		 5805 const struct nlattr * const *nla = cb->data;
5806 struct nft_obj_filter *filter = NULL;
e46abbcc 5807
90fd131a
FW		 5808 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5809 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5810 if (!filter)
5811 return -ENOMEM;
5812
5813 if (nla[NFTA_OBJ_TABLE]) {
5814 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5815 if (!filter->table) {
5816 kfree(filter);
5817 return -ENOMEM;
5818 }
5819 }
5820
5821 if (nla[NFTA_OBJ_TYPE])
5822 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 5823 }
a9fea2a3 5824
90fd131a 5825 cb->data = filter;
a9fea2a3
PNA		 5826 return 0;
5827}
5828
90fd131a 5829static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 5830{
90fd131a 5831 struct nft_obj_filter *filter = cb->data;
a9fea2a3 5832
90fd131a
FW		 5833 if (filter) {
5834 kfree(filter->table);
5835 kfree(filter);
e46abbcc 5836 }
a9fea2a3 5837
90fd131a 5838 return 0;
a9fea2a3
PNA		 5839}
5840
d9adf22a 5841/* called with rcu_read_lock held */
e5009240
PNA		 5842static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5843 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5844 const struct nlattr * const nla[],
5845 struct netlink_ext_ack *extack)
e5009240
PNA		 5846{
5847 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5848 u8 genmask = nft_genmask_cur(net);
5849 int family = nfmsg->nfgen_family;
e5009240
PNA		 5850 const struct nft_table *table;
5851 struct nft_object *obj;
5852 struct sk_buff *skb2;
43da04a5 5853 bool reset = false;
e5009240
PNA		 5854 u32 objtype;
5855 int err;
5856
5857 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5858 struct netlink_dump_control c = {
90fd131a 5859 .start = nf_tables_dump_obj_start,
e5009240 5860 .dump = nf_tables_dump_obj,
a9fea2a3 5861 .done = nf_tables_dump_obj_done,
d9adf22a 5862 .module = THIS_MODULE,
90fd131a 5863 .data = (void *)nla,
e5009240 5864 };
a9fea2a3 5865
d9adf22a 5866 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
e5009240
PNA		 5867 }
5868
5869 if (!nla[NFTA_OBJ_NAME] ||
5870 !nla[NFTA_OBJ_TYPE])
5871 return -EINVAL;
5872
cac20fcd 5873 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5874 if (IS_ERR(table)) {
5875 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5876 return PTR_ERR(table);
36dd1bcc 5877 }
e5009240
PNA		 5878
5879 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 5880 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 5881 if (IS_ERR(obj)) {
5882 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5883 return PTR_ERR(obj);
36dd1bcc 5884 }
e5009240 5885
d9adf22a 5886 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 5887 if (!skb2)
5888 return -ENOMEM;
5889
43da04a5
PNA		 5890 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5891 reset = true;
5892
e5009240
PNA		 5893 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
5894 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 5895 family, table, obj, reset);
e5009240
PNA		 5896 if (err < 0)
5897 goto err;
5898
5899 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5900err:
5901 kfree_skb(skb2);
5902 return err;
e5009240
PNA		 5903}
5904
00bfb320 5905static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 5906{
dfc46034 5907 if (obj->ops->destroy)
00bfb320 5908 obj->ops->destroy(ctx, obj);
e5009240 5909
dfc46034 5910 module_put(obj->ops->type->owner);
d152159b 5911 kfree(obj->key.name);
e5009240
PNA		 5912 kfree(obj);
5913}
5914
5915static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 5916 struct sk_buff *skb, const struct nlmsghdr *nlh,
5917 const struct nlattr * const nla[],
5918 struct netlink_ext_ack *extack)
e5009240
PNA		 5919{
5920 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5921 u8 genmask = nft_genmask_next(net);
5922 int family = nfmsg->nfgen_family;
36dd1bcc 5923 const struct nlattr *attr;
e5009240
PNA		 5924 struct nft_table *table;
5925 struct nft_object *obj;
5926 struct nft_ctx ctx;
5927 u32 objtype;
5928
5929 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 5930 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 5931 return -EINVAL;
5932
cac20fcd 5933 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5934 if (IS_ERR(table)) {
5935 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5936 return PTR_ERR(table);
36dd1bcc 5937 }
e5009240
PNA		 5938
5939 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 5940 if (nla[NFTA_OBJ_HANDLE]) {
5941 attr = nla[NFTA_OBJ_HANDLE];
5942 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
5943 } else {
5944 attr = nla[NFTA_OBJ_NAME];
4d44175a 5945 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
36dd1bcc
PNA		 5946 }
5947
5948 if (IS_ERR(obj)) {
5949 NL_SET_BAD_ATTR(extack, attr);
e5009240 5950 return PTR_ERR(obj);
36dd1bcc
PNA		 5951 }
5952 if (obj->use > 0) {
5953 NL_SET_BAD_ATTR(extack, attr);
e5009240 5954 return -EBUSY;
36dd1bcc 5955 }
e5009240 5956
98319cb9 5957 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240
PNA		 5958
5959 return nft_delobj(&ctx, obj);
5960}
5961
d152159b 5962void nft_obj_notify(struct net *net, const struct nft_table *table,
25e94a99
PNA		 5963 struct nft_object *obj, u32 portid, u32 seq, int event,
5964 int family, int report, gfp_t gfp)
e5009240
PNA		 5965{
5966 struct sk_buff *skb;
5967 int err;
5968
2599e989
PNA		 5969 if (!report &&
5970 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 5971 return;
e5009240 5972
2599e989 5973 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 5974 if (skb == NULL)
5975 goto err;
5976
2599e989
PNA		 5977 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
5978 table, obj, false);
e5009240
PNA		 5979 if (err < 0) {
5980 kfree_skb(skb);
5981 goto err;
5982 }
5983
25e94a99
PNA		 5984 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
5985 return;
e5009240 5986err:
25e94a99 5987 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 5988}
2599e989
PNA		 5989EXPORT_SYMBOL_GPL(nft_obj_notify);
5990
25e94a99
PNA		 5991static void nf_tables_obj_notify(const struct nft_ctx *ctx,
5992 struct nft_object *obj, int event)
2599e989 5993{
25e94a99 5994 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
36596dad 5995 ctx->family, ctx->report, GFP_KERNEL);
2599e989 5996}
e5009240 5997
3b49e2e9
PNA		 5998/*
5999 * Flow tables
6000 */
6001void nft_register_flowtable_type(struct nf_flowtable_type *type)
6002{
6003 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6004 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6005 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6006}
6007EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6008
6009void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6010{
6011 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6012 list_del_rcu(&type->list);
6013 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6014}
6015EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6016
6017static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6018 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6019 .len = NFT_NAME_MAXLEN - 1 },
6020 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6021 .len = NFT_NAME_MAXLEN - 1 },
6022 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 6023 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8bb69f3b 6024 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
3b49e2e9
PNA		 6025};
6026
cac20fcd
PNA		 6027struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6028 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 6029{
6030 struct nft_flowtable *flowtable;
6031
d9adf22a 6032 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 6033 if (!nla_strcmp(nla, flowtable->name) &&
6034 nft_active_genmask(flowtable, genmask))
6035 return flowtable;
6036 }
6037 return ERR_PTR(-ENOENT);
6038}
cac20fcd 6039EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 6040
9b05b6e1
LGL		 6041void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6042 struct nft_flowtable *flowtable,
6043 enum nft_trans_phase phase)
6044{
6045 switch (phase) {
6046 case NFT_TRANS_PREPARE:
6047 case NFT_TRANS_ABORT:
6048 case NFT_TRANS_RELEASE:
6049 flowtable->use--;
6050 /* fall through */
6051 default:
6052 return;
6053 }
6054}
6055EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6056
ae0662f8 6057static struct nft_flowtable *
cac20fcd
PNA		 6058nft_flowtable_lookup_byhandle(const struct nft_table *table,
6059 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 6060{
6061 struct nft_flowtable *flowtable;
6062
6063 list_for_each_entry(flowtable, &table->flowtables, list) {
6064 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6065 nft_active_genmask(flowtable, genmask))
6066 return flowtable;
6067 }
6068 return ERR_PTR(-ENOENT);
6069}
6070
3b49e2e9
PNA		 6071static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6072 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6073 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6074 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6075};
6076
6077static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
6078 const struct nlattr *attr,
6079 struct nft_flowtable *flowtable)
6080{
3b49e2e9 6081 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
3f0465a9 6082 struct nft_hook *hook;
3b49e2e9 6083 int hooknum, priority;
3f0465a9 6084 int err;
3b49e2e9 6085
8cb08174
JB		 6086 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6087 nft_flowtable_hook_policy, NULL);
3b49e2e9
PNA		 6088 if (err < 0)
6089 return err;
6090
6091 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6092 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
6093 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
6094 return -EINVAL;
6095
6096 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
fe19c04c 6097 if (hooknum != NF_NETDEV_INGRESS)
3b49e2e9
PNA		 6098 return -EINVAL;
6099
6100 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6101
3f0465a9
PNA		 6102 err = nf_tables_parse_netdev_hooks(ctx->net,
6103 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6104 &flowtable->hook_list);
3b49e2e9 6105 if (err < 0)
d92191aa 6106 return err;
3b49e2e9 6107
71a8a63b
PNA		 6108 flowtable->hooknum = hooknum;
6109 flowtable->data.priority = priority;
3b49e2e9 6110
3f0465a9
PNA		 6111 list_for_each_entry(hook, &flowtable->hook_list, list) {
6112 hook->ops.pf = NFPROTO_NETDEV;
6113 hook->ops.hooknum = hooknum;
6114 hook->ops.priority = priority;
6115 hook->ops.priv = &flowtable->data;
6116 hook->ops.hook = flowtable->data.type->hook;
3b49e2e9
PNA		 6117 }
6118
3b49e2e9
PNA		 6119 return err;
6120}
6121
98319cb9 6122static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 6123{
6124 const struct nf_flowtable_type *type;
6125
6126 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 6127 if (family == type->family)
3b49e2e9
PNA		 6128 return type;
6129 }
6130 return NULL;
6131}
6132
452238e8
FW		 6133static const struct nf_flowtable_type *
6134nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 6135{
6136 const struct nf_flowtable_type *type;
6137
98319cb9 6138 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 6139 if (type != NULL && try_module_get(type->owner))
6140 return type;
6141
f102d66b 6142 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 6143#ifdef CONFIG_MODULES
6144 if (type == NULL) {
eb014de4 6145 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
3b49e2e9
PNA		 6146 return ERR_PTR(-EAGAIN);
6147 }
6148#endif
6149 return ERR_PTR(-ENOENT);
6150}
6151
5acab914 6152/* Only called from error and netdev event paths. */
ff4bf2f4
PNA		 6153static void nft_unregister_flowtable_hook(struct net *net,
6154 struct nft_flowtable *flowtable,
6155 struct nft_hook *hook)
6156{
6157 nf_unregister_net_hook(net, &hook->ops);
6158 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6159 FLOW_BLOCK_UNBIND);
6160}
6161
3b49e2e9
PNA		 6162static void nft_unregister_flowtable_net_hooks(struct net *net,
6163 struct nft_flowtable *flowtable)
6164{
3f0465a9 6165 struct nft_hook *hook;
3b49e2e9 6166
ff4bf2f4 6167 list_for_each_entry(hook, &flowtable->hook_list, list)
5acab914 6168 nf_unregister_net_hook(net, &hook->ops);
3f0465a9
PNA		 6169}
6170
6171static int nft_register_flowtable_net_hooks(struct net *net,
6172 struct nft_table *table,
6173 struct nft_flowtable *flowtable)
6174{
6175 struct nft_hook *hook, *hook2, *next;
6176 struct nft_flowtable *ft;
6177 int err, i = 0;
6178
6179 list_for_each_entry(hook, &flowtable->hook_list, list) {
6180 list_for_each_entry(ft, &table->flowtables, list) {
6181 list_for_each_entry(hook2, &ft->hook_list, list) {
6182 if (hook->ops.dev == hook2->ops.dev &&
6183 hook->ops.pf == hook2->ops.pf) {
6184 err = -EBUSY;
6185 goto err_unregister_net_hooks;
6186 }
6187 }
6188 }
3b49e2e9 6189
d7c03a9f 6190 err = flowtable->data.type->setup(&flowtable->data,
6191 hook->ops.dev,
6192 FLOW_BLOCK_BIND);
3f0465a9
PNA		 6193 if (err < 0)
6194 goto err_unregister_net_hooks;
6195
d7c03a9f 6196 err = nf_register_net_hook(net, &hook->ops);
6197 if (err < 0) {
6198 flowtable->data.type->setup(&flowtable->data,
6199 hook->ops.dev,
6200 FLOW_BLOCK_UNBIND);
6201 goto err_unregister_net_hooks;
6202 }
6203
3f0465a9 6204 i++;
3b49e2e9 6205 }
3f0465a9
PNA		 6206
6207 return 0;
6208
6209err_unregister_net_hooks:
6210 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6211 if (i-- <= 0)
6212 break;
6213
ff4bf2f4 6214 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 6215 list_del_rcu(&hook->list);
6216 kfree_rcu(hook, rcu);
6217 }
6218
6219 return err;
3b49e2e9
PNA		 6220}
6221
6222static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6223 struct sk_buff *skb,
6224 const struct nlmsghdr *nlh,
6225 const struct nlattr * const nla[],
6226 struct netlink_ext_ack *extack)
6227{
6228 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6229 const struct nf_flowtable_type *type;
6230 u8 genmask = nft_genmask_next(net);
6231 int family = nfmsg->nfgen_family;
3f0465a9
PNA		 6232 struct nft_flowtable *flowtable;
6233 struct nft_hook *hook, *next;
3b49e2e9
PNA		 6234 struct nft_table *table;
6235 struct nft_ctx ctx;
3f0465a9 6236 int err;
3b49e2e9
PNA		 6237
6238 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6239 !nla[NFTA_FLOWTABLE_NAME] ||
6240 !nla[NFTA_FLOWTABLE_HOOK])
6241 return -EINVAL;
6242
cac20fcd
PNA		 6243 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6244 genmask);
36dd1bcc
PNA		 6245 if (IS_ERR(table)) {
6246 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 6247 return PTR_ERR(table);
36dd1bcc 6248 }
3b49e2e9 6249
cac20fcd
PNA		 6250 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6251 genmask);
3b49e2e9
PNA		 6252 if (IS_ERR(flowtable)) {
6253 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 6254 if (err != -ENOENT) {
6255 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 6256 return err;
36dd1bcc 6257 }
3b49e2e9 6258 } else {
36dd1bcc
PNA		 6259 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6260 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 6261 return -EEXIST;
36dd1bcc 6262 }
3b49e2e9
PNA		 6263
6264 return 0;
6265 }
6266
98319cb9 6267 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 6268
6269 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6270 if (!flowtable)
6271 return -ENOMEM;
6272
6273 flowtable->table = table;
3ecbfd65 6274 flowtable->handle = nf_tables_alloc_handle(table);
3f0465a9 6275 INIT_LIST_HEAD(&flowtable->hook_list);
3ecbfd65 6276
3b49e2e9
PNA		 6277 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6278 if (!flowtable->name) {
6279 err = -ENOMEM;
6280 goto err1;
6281 }
6282
452238e8 6283 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 6284 if (IS_ERR(type)) {
6285 err = PTR_ERR(type);
6286 goto err2;
6287 }
6288
8bb69f3b
PNA		 6289 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6290 flowtable->data.flags =
6291 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6292 if (flowtable->data.flags & ~NF_FLOWTABLE_HW_OFFLOAD)
6293 goto err3;
6294 }
6295
6296 write_pnet(&flowtable->data.net, net);
3b49e2e9 6297 flowtable->data.type = type;
a268de77 6298 err = type->init(&flowtable->data);
3b49e2e9
PNA		 6299 if (err < 0)
6300 goto err3;
6301
6302 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6303 flowtable);
6304 if (err < 0)
a268de77 6305 goto err4;
3b49e2e9 6306
3f0465a9 6307 err = nft_register_flowtable_net_hooks(ctx.net, table, flowtable);
2d285f26
FW		 6308 if (err < 0) {
6309 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6310 list_del_rcu(&hook->list);
6311 kfree_rcu(hook, rcu);
6312 }
3f0465a9 6313 goto err4;
2d285f26 6314 }
3b49e2e9
PNA		 6315
6316 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6317 if (err < 0)
3f0465a9 6318 goto err5;
3b49e2e9
PNA		 6319
6320 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6321 table->use++;
6322
6323 return 0;
a268de77 6324err5:
3f0465a9 6325 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
ff4bf2f4 6326 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 6327 list_del_rcu(&hook->list);
6328 kfree_rcu(hook, rcu);
6329 }
a268de77
FF		 6330err4:
6331 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 6332err3:
6333 module_put(type->owner);
6334err2:
6335 kfree(flowtable->name);
6336err1:
6337 kfree(flowtable);
6338 return err;
6339}
6340
6341static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6342 struct sk_buff *skb,
6343 const struct nlmsghdr *nlh,
6344 const struct nlattr * const nla[],
6345 struct netlink_ext_ack *extack)
6346{
6347 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6348 u8 genmask = nft_genmask_next(net);
6349 int family = nfmsg->nfgen_family;
6350 struct nft_flowtable *flowtable;
36dd1bcc 6351 const struct nlattr *attr;
3b49e2e9
PNA		 6352 struct nft_table *table;
6353 struct nft_ctx ctx;
6354
e603ea4b
PNA		 6355 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6356 (!nla[NFTA_FLOWTABLE_NAME] &&
6357 !nla[NFTA_FLOWTABLE_HANDLE]))
6358 return -EINVAL;
6359
cac20fcd
PNA		 6360 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6361 genmask);
36dd1bcc
PNA		 6362 if (IS_ERR(table)) {
6363 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 6364 return PTR_ERR(table);
36dd1bcc 6365 }
3b49e2e9 6366
36dd1bcc
PNA		 6367 if (nla[NFTA_FLOWTABLE_HANDLE]) {
6368 attr = nla[NFTA_FLOWTABLE_HANDLE];
6369 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6370 } else {
6371 attr = nla[NFTA_FLOWTABLE_NAME];
6372 flowtable = nft_flowtable_lookup(table, attr, genmask);
6373 }
6374
6375 if (IS_ERR(flowtable)) {
6376 NL_SET_BAD_ATTR(extack, attr);
6377 return PTR_ERR(flowtable);
6378 }
6379 if (flowtable->use > 0) {
6380 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 6381 return -EBUSY;
36dd1bcc 6382 }
3b49e2e9 6383
98319cb9 6384 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 6385
6386 return nft_delflowtable(&ctx, flowtable);
6387}
6388
6389static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6390 u32 portid, u32 seq, int event,
6391 u32 flags, int family,
6392 struct nft_flowtable *flowtable)
6393{
6394 struct nlattr *nest, *nest_devs;
6395 struct nfgenmsg *nfmsg;
3f0465a9 6396 struct nft_hook *hook;
3b49e2e9 6397 struct nlmsghdr *nlh;
3b49e2e9
PNA		 6398
6399 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6400 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6401 if (nlh == NULL)
6402 goto nla_put_failure;
6403
6404 nfmsg = nlmsg_data(nlh);
6405 nfmsg->nfgen_family = family;
6406 nfmsg->version = NFNETLINK_V0;
6407 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6408
6409 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6410 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 6411 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6412 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8bb69f3b
PNA		 6413 NFTA_FLOWTABLE_PAD) ||
6414 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
3b49e2e9
PNA		 6415 goto nla_put_failure;
6416
ae0be8de 6417 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
eb895086
KL		 6418 if (!nest)
6419 goto nla_put_failure;
3b49e2e9 6420 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
71a8a63b 6421 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
3b49e2e9
PNA		 6422 goto nla_put_failure;
6423
ae0be8de 6424 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
3b49e2e9
PNA		 6425 if (!nest_devs)
6426 goto nla_put_failure;
6427
3f0465a9
PNA		 6428 list_for_each_entry_rcu(hook, &flowtable->hook_list, list) {
6429 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
3b49e2e9
PNA		 6430 goto nla_put_failure;
6431 }
6432 nla_nest_end(skb, nest_devs);
6433 nla_nest_end(skb, nest);
6434
6435 nlmsg_end(skb, nlh);
6436 return 0;
6437
6438nla_put_failure:
6439 nlmsg_trim(skb, nlh);
6440 return -1;
6441}
6442
6443struct nft_flowtable_filter {
6444 char *table;
6445};
6446
6447static int nf_tables_dump_flowtable(struct sk_buff *skb,
6448 struct netlink_callback *cb)
6449{
6450 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6451 struct nft_flowtable_filter *filter = cb->data;
6452 unsigned int idx = 0, s_idx = cb->args[0];
6453 struct net *net = sock_net(skb->sk);
6454 int family = nfmsg->nfgen_family;
6455 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 6456 const struct nft_table *table;
6457
6458 rcu_read_lock();
6459 cb->seq = net->nft.base_seq;
6460
36596dad 6461 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 6462 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 6463 continue;
6464
36596dad
PNA		 6465 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6466 if (!nft_is_active(net, flowtable))
6467 goto cont;
6468 if (idx < s_idx)
6469 goto cont;
6470 if (idx > s_idx)
6471 memset(&cb->args[1], 0,
6472 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 6473 if (filter && filter->table &&
36596dad
PNA		 6474 strcmp(filter->table, table->name))
6475 goto cont;
3b49e2e9 6476
36596dad
PNA		 6477 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6478 cb->nlh->nlmsg_seq,
6479 NFT_MSG_NEWFLOWTABLE,
6480 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 6481 table->family, flowtable) < 0)
36596dad 6482 goto done;
3b49e2e9 6483
36596dad 6484 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 6485cont:
36596dad 6486 idx++;
3b49e2e9
PNA		 6487 }
6488 }
6489done:
6490 rcu_read_unlock();
6491
6492 cb->args[0] = idx;
6493 return skb->len;
6494}
6495
90fd131a 6496static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 6497{
90fd131a
FW		 6498 const struct nlattr * const *nla = cb->data;
6499 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 6500
90fd131a
FW		 6501 if (nla[NFTA_FLOWTABLE_TABLE]) {
6502 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6503 if (!filter)
6504 return -ENOMEM;
3b49e2e9 6505
90fd131a
FW		 6506 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6507 GFP_ATOMIC);
6508 if (!filter->table) {
6509 kfree(filter);
6510 return -ENOMEM;
6511 }
6512 }
3b49e2e9 6513
90fd131a 6514 cb->data = filter;
3b49e2e9
PNA		 6515 return 0;
6516}
6517
90fd131a 6518static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 6519{
90fd131a 6520 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 6521
3b49e2e9 6522 if (!filter)
90fd131a 6523 return 0;
3b49e2e9 6524
90fd131a
FW		 6525 kfree(filter->table);
6526 kfree(filter);
6527
6528 return 0;
3b49e2e9
PNA		 6529}
6530
d9adf22a 6531/* called with rcu_read_lock held */
3b49e2e9
PNA		 6532static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6533 struct sk_buff *skb,
6534 const struct nlmsghdr *nlh,
6535 const struct nlattr * const nla[],
6536 struct netlink_ext_ack *extack)
6537{
6538 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6539 u8 genmask = nft_genmask_cur(net);
6540 int family = nfmsg->nfgen_family;
6541 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 6542 const struct nft_table *table;
6543 struct sk_buff *skb2;
6544 int err;
6545
6546 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6547 struct netlink_dump_control c = {
90fd131a 6548 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 6549 .dump = nf_tables_dump_flowtable,
6550 .done = nf_tables_dump_flowtable_done,
d9adf22a 6551 .module = THIS_MODULE,
90fd131a 6552 .data = (void *)nla,
3b49e2e9
PNA		 6553 };
6554
d9adf22a 6555 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3b49e2e9
PNA		 6556 }
6557
6558 if (!nla[NFTA_FLOWTABLE_NAME])
6559 return -EINVAL;
6560
cac20fcd
PNA		 6561 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6562 genmask);
3b49e2e9
PNA		 6563 if (IS_ERR(table))
6564 return PTR_ERR(table);
6565
cac20fcd
PNA		 6566 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6567 genmask);
03a0120f 6568 if (IS_ERR(flowtable))
3b49e2e9
PNA		 6569 return PTR_ERR(flowtable);
6570
d9adf22a 6571 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 6572 if (!skb2)
6573 return -ENOMEM;
6574
6575 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6576 nlh->nlmsg_seq,
6577 NFT_MSG_NEWFLOWTABLE, 0, family,
6578 flowtable);
6579 if (err < 0)
6580 goto err;
6581
6582 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6583err:
6584 kfree_skb(skb2);
6585 return err;
6586}
6587
6588static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6589 struct nft_flowtable *flowtable,
6590 int event)
6591{
6592 struct sk_buff *skb;
6593 int err;
6594
6595 if (ctx->report &&
6596 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6597 return;
6598
6599 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6600 if (skb == NULL)
6601 goto err;
6602
6603 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6604 ctx->seq, event, 0,
36596dad 6605 ctx->family, flowtable);
3b49e2e9
PNA		 6606 if (err < 0) {
6607 kfree_skb(skb);
6608 goto err;
6609 }
6610
6611 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6612 ctx->report, GFP_KERNEL);
6613 return;
6614err:
6615 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6616}
6617
3b49e2e9
PNA		 6618static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6619{
3f0465a9
PNA		 6620 struct nft_hook *hook, *next;
6621
5acab914 6622 flowtable->data.type->free(&flowtable->data);
3f0465a9 6623 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
5acab914
PNA		 6624 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6625 FLOW_BLOCK_UNBIND);
3f0465a9
PNA		 6626 list_del_rcu(&hook->list);
6627 kfree(hook);
6628 }
3b49e2e9 6629 kfree(flowtable->name);
3b49e2e9 6630 module_put(flowtable->data.type->owner);
a12486eb 6631 kfree(flowtable);
3b49e2e9
PNA		 6632}
6633
84d7fce6
PNA		 6634static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6635 u32 portid, u32 seq)
6636{
6637 struct nlmsghdr *nlh;
6638 struct nfgenmsg *nfmsg;
784b4e61 6639 char buf[TASK_COMM_LEN];
dedb67c4 6640 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 6641
6642 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6643 if (nlh == NULL)
6644 goto nla_put_failure;
6645
6646 nfmsg = nlmsg_data(nlh);
6647 nfmsg->nfgen_family = AF_UNSPEC;
6648 nfmsg->version = NFNETLINK_V0;
6649 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6650
784b4e61
PS		 6651 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6652 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6653 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 6654 goto nla_put_failure;
6655
053c095a
JB		 6656 nlmsg_end(skb, nlh);
6657 return 0;
84d7fce6
PNA		 6658
6659nla_put_failure:
6660 nlmsg_trim(skb, nlh);
6661 return -EMSGSIZE;
6662}
6663
3b49e2e9
PNA		 6664static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6665 struct nft_flowtable *flowtable)
6666{
3f0465a9 6667 struct nft_hook *hook;
3b49e2e9 6668
3f0465a9
PNA		 6669 list_for_each_entry(hook, &flowtable->hook_list, list) {
6670 if (hook->ops.dev != dev)
3b49e2e9
PNA		 6671 continue;
6672
5acab914 6673 /* flow_offload_netdev_event() cleans up entries for us. */
ff4bf2f4 6674 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
3f0465a9
PNA		 6675 list_del_rcu(&hook->list);
6676 kfree_rcu(hook, rcu);
3b49e2e9
PNA		 6677 break;
6678 }
6679}
6680
6681static int nf_tables_flowtable_event(struct notifier_block *this,
6682 unsigned long event, void *ptr)
6683{
6684 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6685 struct nft_flowtable *flowtable;
6686 struct nft_table *table;
0a2cf5ee 6687 struct net *net;
3b49e2e9
PNA		 6688
6689 if (event != NETDEV_UNREGISTER)
6690 return 0;
6691
6a48de01 6692 net = dev_net(dev);
9e619d87 6693 mutex_lock(&net->nft.commit_mutex);
0a2cf5ee 6694 list_for_each_entry(table, &net->nft.tables, list) {
36596dad
PNA		 6695 list_for_each_entry(flowtable, &table->flowtables, list) {
6696 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 6697 }
6698 }
9e619d87 6699 mutex_unlock(&net->nft.commit_mutex);
6a48de01 6700
3b49e2e9
PNA		 6701 return NOTIFY_DONE;
6702}
6703
6704static struct notifier_block nf_tables_flowtable_notifier = {
6705 .notifier_call = nf_tables_flowtable_event,
6706};
6707
25e94a99
PNA		 6708static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
6709 int event)
84d7fce6
PNA		 6710{
6711 struct nlmsghdr *nlh = nlmsg_hdr(skb);
6712 struct sk_buff *skb2;
6713 int err;
6714
6715 if (nlmsg_report(nlh) &&
6716 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 6717 return;
84d7fce6 6718
84d7fce6
PNA		 6719 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6720 if (skb2 == NULL)
6721 goto err;
6722
6723 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6724 nlh->nlmsg_seq);
6725 if (err < 0) {
6726 kfree_skb(skb2);
6727 goto err;
6728 }
6729
25e94a99
PNA		 6730 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6731 nlmsg_report(nlh), GFP_KERNEL);
6732 return;
84d7fce6 6733err:
25e94a99
PNA		 6734 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
6735 -ENOBUFS);
84d7fce6
PNA		 6736}
6737
7b8002a1
PNA		 6738static int nf_tables_getgen(struct net *net, struct sock *nlsk,
6739 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 6740 const struct nlattr * const nla[],
6741 struct netlink_ext_ack *extack)
84d7fce6 6742{
84d7fce6
PNA		 6743 struct sk_buff *skb2;
6744 int err;
6745
d9adf22a 6746 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 6747 if (skb2 == NULL)
6748 return -ENOMEM;
6749
6750 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
6751 nlh->nlmsg_seq);
6752 if (err < 0)
6753 goto err;
6754
6755 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6756err:
6757 kfree_skb(skb2);
6758 return err;
6759}
6760
96518518
PM		 6761static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
6762 [NFT_MSG_NEWTABLE] = {
55dd6f93 6763 .call_batch = nf_tables_newtable,
96518518
PM		 6764 .attr_count = NFTA_TABLE_MAX,
6765 .policy = nft_table_policy,
6766 },
6767 [NFT_MSG_GETTABLE] = {
d9adf22a 6768 .call_rcu = nf_tables_gettable,
96518518
PM		 6769 .attr_count = NFTA_TABLE_MAX,
6770 .policy = nft_table_policy,
6771 },
6772 [NFT_MSG_DELTABLE] = {
55dd6f93 6773 .call_batch = nf_tables_deltable,
96518518
PM		 6774 .attr_count = NFTA_TABLE_MAX,
6775 .policy = nft_table_policy,
6776 },
6777 [NFT_MSG_NEWCHAIN] = {
91c7b38d 6778 .call_batch = nf_tables_newchain,
96518518
PM		 6779 .attr_count = NFTA_CHAIN_MAX,
6780 .policy = nft_chain_policy,
6781 },
6782 [NFT_MSG_GETCHAIN] = {
d9adf22a 6783 .call_rcu = nf_tables_getchain,
96518518
PM		 6784 .attr_count = NFTA_CHAIN_MAX,
6785 .policy = nft_chain_policy,
6786 },
6787 [NFT_MSG_DELCHAIN] = {
91c7b38d 6788 .call_batch = nf_tables_delchain,
96518518
PM		 6789 .attr_count = NFTA_CHAIN_MAX,
6790 .policy = nft_chain_policy,
6791 },
6792 [NFT_MSG_NEWRULE] = {
0628b123 6793 .call_batch = nf_tables_newrule,
96518518
PM		 6794 .attr_count = NFTA_RULE_MAX,
6795 .policy = nft_rule_policy,
6796 },
6797 [NFT_MSG_GETRULE] = {
d9adf22a 6798 .call_rcu = nf_tables_getrule,
96518518
PM		 6799 .attr_count = NFTA_RULE_MAX,
6800 .policy = nft_rule_policy,
6801 },
6802 [NFT_MSG_DELRULE] = {
0628b123 6803 .call_batch = nf_tables_delrule,
96518518
PM		 6804 .attr_count = NFTA_RULE_MAX,
6805 .policy = nft_rule_policy,
6806 },
20a69341 6807 [NFT_MSG_NEWSET] = {
958bee14 6808 .call_batch = nf_tables_newset,
20a69341
PM		 6809 .attr_count = NFTA_SET_MAX,
6810 .policy = nft_set_policy,
6811 },
6812 [NFT_MSG_GETSET] = {
d9adf22a 6813 .call_rcu = nf_tables_getset,
20a69341
PM		 6814 .attr_count = NFTA_SET_MAX,
6815 .policy = nft_set_policy,
6816 },
6817 [NFT_MSG_DELSET] = {
958bee14 6818 .call_batch = nf_tables_delset,
20a69341
PM		 6819 .attr_count = NFTA_SET_MAX,
6820 .policy = nft_set_policy,
6821 },
6822 [NFT_MSG_NEWSETELEM] = {
958bee14 6823 .call_batch = nf_tables_newsetelem,
20a69341
PM		 6824 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6825 .policy = nft_set_elem_list_policy,
6826 },
6827 [NFT_MSG_GETSETELEM] = {
d9adf22a 6828 .call_rcu = nf_tables_getsetelem,
20a69341
PM		 6829 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6830 .policy = nft_set_elem_list_policy,
6831 },
6832 [NFT_MSG_DELSETELEM] = {
958bee14 6833 .call_batch = nf_tables_delsetelem,
20a69341
PM		 6834 .attr_count = NFTA_SET_ELEM_LIST_MAX,
6835 .policy = nft_set_elem_list_policy,
6836 },
84d7fce6 6837 [NFT_MSG_GETGEN] = {
d9adf22a 6838 .call_rcu = nf_tables_getgen,
84d7fce6 6839 },
e5009240
PNA		 6840 [NFT_MSG_NEWOBJ] = {
6841 .call_batch = nf_tables_newobj,
6842 .attr_count = NFTA_OBJ_MAX,
6843 .policy = nft_obj_policy,
6844 },
6845 [NFT_MSG_GETOBJ] = {
d9adf22a 6846 .call_rcu = nf_tables_getobj,
e5009240
PNA		 6847 .attr_count = NFTA_OBJ_MAX,
6848 .policy = nft_obj_policy,
6849 },
6850 [NFT_MSG_DELOBJ] = {
6851 .call_batch = nf_tables_delobj,
6852 .attr_count = NFTA_OBJ_MAX,
6853 .policy = nft_obj_policy,
6854 },
43da04a5 6855 [NFT_MSG_GETOBJ_RESET] = {
d9adf22a 6856 .call_rcu = nf_tables_getobj,
43da04a5
PNA		 6857 .attr_count = NFTA_OBJ_MAX,
6858 .policy = nft_obj_policy,
6859 },
3b49e2e9
PNA		 6860 [NFT_MSG_NEWFLOWTABLE] = {
6861 .call_batch = nf_tables_newflowtable,
6862 .attr_count = NFTA_FLOWTABLE_MAX,
6863 .policy = nft_flowtable_policy,
6864 },
6865 [NFT_MSG_GETFLOWTABLE] = {
d9adf22a 6866 .call_rcu = nf_tables_getflowtable,
3b49e2e9
PNA		 6867 .attr_count = NFTA_FLOWTABLE_MAX,
6868 .policy = nft_flowtable_policy,
6869 },
6870 [NFT_MSG_DELFLOWTABLE] = {
6871 .call_batch = nf_tables_delflowtable,
6872 .attr_count = NFTA_FLOWTABLE_MAX,
6873 .policy = nft_flowtable_policy,
6874 },
96518518
PM		 6875};
6876
a654de8f
PNA		 6877static int nf_tables_validate(struct net *net)
6878{
6879 struct nft_table *table;
6880
6881 switch (net->nft.validate_state) {
6882 case NFT_VALIDATE_SKIP:
6883 break;
6884 case NFT_VALIDATE_NEED:
6885 nft_validate_state_update(net, NFT_VALIDATE_DO);
6886 /* fall through */
6887 case NFT_VALIDATE_DO:
6888 list_for_each_entry(table, &net->nft.tables, list) {
6889 if (nft_table_validate(net, table) < 0)
6890 return -EAGAIN;
6891 }
6892 break;
6893 }
6894
6895 return 0;
6896}
6897
66293c46
FW		 6898/* a drop policy has to be deferred until all rules have been activated,
6899 * otherwise a large ruleset that contains a drop-policy base chain will
6900 * cause all packets to get dropped until the full transaction has been
6901 * processed.
6902 *
6903 * We defer the drop policy until the transaction has been finalized.
6904 */
6905static void nft_chain_commit_drop_policy(struct nft_trans *trans)
6906{
6907 struct nft_base_chain *basechain;
6908
6909 if (nft_trans_chain_policy(trans) != NF_DROP)
6910 return;
6911
6912 if (!nft_is_base_chain(trans->ctx.chain))
6913 return;
6914
6915 basechain = nft_base_chain(trans->ctx.chain);
6916 basechain->policy = NF_DROP;
6917}
6918
91c7b38d
PNA		 6919static void nft_chain_commit_update(struct nft_trans *trans)
6920{
6921 struct nft_base_chain *basechain;
6922
1b2470e5
FW		 6923 if (nft_trans_chain_name(trans)) {
6924 rhltable_remove(&trans->ctx.table->chains_ht,
6925 &trans->ctx.chain->rhlhead,
6926 nft_chain_ht_params);
d71efb59 6927 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 6928 rhltable_insert_key(&trans->ctx.table->chains_ht,
6929 trans->ctx.chain->name,
6930 &trans->ctx.chain->rhlhead,
6931 nft_chain_ht_params);
6932 }
91c7b38d 6933
f323d954 6934 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 6935 return;
6936
53315ac6
FW		 6937 nft_chain_stats_replace(trans);
6938
91c7b38d 6939 basechain = nft_base_chain(trans->ctx.chain);
91c7b38d
PNA		 6940
6941 switch (nft_trans_chain_policy(trans)) {
6942 case NF_DROP:
6943 case NF_ACCEPT:
6944 basechain->policy = nft_trans_chain_policy(trans);
6945 break;
6946 }
6947}
6948
d62d0ba9
FFM		 6949static void nft_obj_commit_update(struct nft_trans *trans)
6950{
6951 struct nft_object *newobj;
6952 struct nft_object *obj;
6953
6954 obj = nft_trans_obj(trans);
6955 newobj = nft_trans_obj_newobj(trans);
6956
9fedd894
FFM		 6957 if (obj->ops->update)
6958 obj->ops->update(obj, newobj);
d62d0ba9
FFM		 6959
6960 kfree(newobj);
6961}
6962
2f99aa31 6963static void nft_commit_release(struct nft_trans *trans)
c7c32e72 6964{
c7c32e72
PNA		 6965 switch (trans->msg_type) {
6966 case NFT_MSG_DELTABLE:
6967 nf_tables_table_destroy(&trans->ctx);
6968 break;
9f8aac0b 6969 case NFT_MSG_NEWCHAIN:
53315ac6 6970 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b
FW		 6971 kfree(nft_trans_chain_name(trans));
6972 break;
c7c32e72 6973 case NFT_MSG_DELCHAIN:
43a605f2 6974 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 6975 break;
6976 case NFT_MSG_DELRULE:
6977 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
6978 break;
6979 case NFT_MSG_DELSET:
6980 nft_set_destroy(nft_trans_set(trans));
6981 break;
61edafbb 6982 case NFT_MSG_DELSETELEM:
3453c927
PNA		 6983 nf_tables_set_elem_destroy(&trans->ctx,
6984 nft_trans_elem_set(trans),
59105446 6985 nft_trans_elem(trans).priv);
61edafbb 6986 break;
e5009240 6987 case NFT_MSG_DELOBJ:
00bfb320 6988 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 6989 break;
3b49e2e9
PNA		 6990 case NFT_MSG_DELFLOWTABLE:
6991 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
6992 break;
c7c32e72 6993 }
0935d558
FW		 6994
6995 if (trans->put_net)
6996 put_net(trans->ctx.net);
6997
c7c32e72
PNA		 6998 kfree(trans);
6999}
7000
0935d558 7001static void nf_tables_trans_destroy_work(struct work_struct *w)
2f99aa31
FW		 7002{
7003 struct nft_trans *trans, *next;
0935d558
FW		 7004 LIST_HEAD(head);
7005
7006 spin_lock(&nf_tables_destroy_list_lock);
7007 list_splice_init(&nf_tables_destroy_list, &head);
7008 spin_unlock(&nf_tables_destroy_list_lock);
2f99aa31 7009
0935d558 7010 if (list_empty(&head))
2f99aa31
FW		 7011 return;
7012
7013 synchronize_rcu();
7014
0935d558 7015 list_for_each_entry_safe(trans, next, &head, list) {
2f99aa31
FW		 7016 list_del(&trans->list);
7017 nft_commit_release(trans);
7018 }
7019}
7020
0cbc06b3
FW		 7021static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7022{
7023 struct nft_rule *rule;
7024 unsigned int alloc = 0;
7025 int i;
7026
7027 /* already handled or inactive chain? */
7028 if (chain->rules_next || !nft_is_active_next(net, chain))
7029 return 0;
7030
7031 rule = list_entry(&chain->rules, struct nft_rule, list);
7032 i = 0;
7033
7034 list_for_each_entry_continue(rule, &chain->rules, list) {
7035 if (nft_is_active_next(net, rule))
7036 alloc++;
7037 }
7038
7039 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7040 if (!chain->rules_next)
7041 return -ENOMEM;
7042
7043 list_for_each_entry_continue(rule, &chain->rules, list) {
7044 if (nft_is_active_next(net, rule))
7045 chain->rules_next[i++] = rule;
7046 }
7047
7048 chain->rules_next[i] = NULL;
7049 return 0;
7050}
7051
7052static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7053{
7054 struct nft_trans *trans, *next;
7055
7056 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7057 struct nft_chain *chain = trans->ctx.chain;
7058
7059 if (trans->msg_type == NFT_MSG_NEWRULE ||
7060 trans->msg_type == NFT_MSG_DELRULE) {
7061 kvfree(chain->rules_next);
7062 chain->rules_next = NULL;
7063 }
7064 }
7065}
7066
7067static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7068{
7069 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7070
7071 kvfree(o->start);
7072}
7073
7074static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7075{
7076 struct nft_rule **r = rules;
7077 struct nft_rules_old *old;
7078
7079 while (*r)
7080 r++;
7081
7082 r++; /* rcu_head is after end marker */
7083 old = (void *) r;
7084 old->start = rules;
7085
7086 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7087}
7088
0fb39bbe 7089static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
0cbc06b3
FW		 7090{
7091 struct nft_rule **g0, **g1;
7092 bool next_genbit;
7093
7094 next_genbit = nft_gencursor_next(net);
7095
7096 g0 = rcu_dereference_protected(chain->rules_gen_0,
f102d66b 7097 lockdep_commit_lock_is_held(net));
0cbc06b3 7098 g1 = rcu_dereference_protected(chain->rules_gen_1,
f102d66b 7099 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 7100
7101 /* No changes to this chain? */
7102 if (chain->rules_next == NULL) {
7103 /* chain had no change in last or next generation */
7104 if (g0 == g1)
7105 return;
7106 /*
7107 * chain had no change in this generation; make sure next
7108 * one uses same rules as current generation.
7109 */
7110 if (next_genbit) {
7111 rcu_assign_pointer(chain->rules_gen_1, g0);
7112 nf_tables_commit_chain_free_rules_old(g1);
7113 } else {
7114 rcu_assign_pointer(chain->rules_gen_0, g1);
7115 nf_tables_commit_chain_free_rules_old(g0);
7116 }
7117
7118 return;
7119 }
7120
7121 if (next_genbit)
7122 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7123 else
7124 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7125
7126 chain->rules_next = NULL;
7127
7128 if (g0 == g1)
7129 return;
7130
7131 if (next_genbit)
7132 nf_tables_commit_chain_free_rules_old(g1);
7133 else
7134 nf_tables_commit_chain_free_rules_old(g0);
7135}
7136
d152159b
FW		 7137static void nft_obj_del(struct nft_object *obj)
7138{
4d44175a 7139 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
d152159b
FW		 7140 list_del_rcu(&obj->list);
7141}
7142
1b2470e5
FW		 7143static void nft_chain_del(struct nft_chain *chain)
7144{
7145 struct nft_table *table = chain->table;
7146
7147 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7148 nft_chain_ht_params));
7149 list_del_rcu(&chain->list);
7150}
7151
eb014de4
PNA		 7152static void nf_tables_module_autoload_cleanup(struct net *net)
7153{
7154 struct nft_module_request *req, *next;
7155
7156 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7157 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7158 WARN_ON_ONCE(!req->done);
7159 list_del(&req->list);
7160 kfree(req);
7161 }
7162}
7163
0935d558
FW		 7164static void nf_tables_commit_release(struct net *net)
7165{
7166 struct nft_trans *trans;
7167
7168 /* all side effects have to be made visible.
7169 * For example, if a chain named 'foo' has been deleted, a
7170 * new transaction must not find it anymore.
7171 *
7172 * Memory reclaim happens asynchronously from work queue
7173 * to prevent expensive synchronize_rcu() in commit phase.
7174 */
7175 if (list_empty(&net->nft.commit_list)) {
eb014de4 7176 nf_tables_module_autoload_cleanup(net);
0935d558
FW		 7177 mutex_unlock(&net->nft.commit_mutex);
7178 return;
7179 }
7180
7181 trans = list_last_entry(&net->nft.commit_list,
7182 struct nft_trans, list);
7183 get_net(trans->ctx.net);
7184 WARN_ON_ONCE(trans->put_net);
7185
7186 trans->put_net = true;
7187 spin_lock(&nf_tables_destroy_list_lock);
7188 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7189 spin_unlock(&nf_tables_destroy_list_lock);
7190
eb014de4 7191 nf_tables_module_autoload_cleanup(net);
0935d558
FW		 7192 mutex_unlock(&net->nft.commit_mutex);
7193
7194 schedule_work(&trans_destroy_work);
7195}
7196
5913beaf 7197static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 7198{
37082f93 7199 struct nft_trans *trans, *next;
a3716e70 7200 struct nft_trans_elem *te;
0cbc06b3
FW		 7201 struct nft_chain *chain;
7202 struct nft_table *table;
c9626a2c 7203 int err;
37082f93 7204
b8b27498
FW		 7205 if (list_empty(&net->nft.commit_list)) {
7206 mutex_unlock(&net->nft.commit_mutex);
7207 return 0;
7208 }
7209
a654de8f
PNA		 7210 /* 0. Validate ruleset, otherwise roll back for error reporting. */
7211 if (nf_tables_validate(net) < 0)
7212 return -EAGAIN;
7213
c9626a2c
PNA		 7214 err = nft_flow_rule_offload_commit(net);
7215 if (err < 0)
7216 return err;
7217
0cbc06b3
FW		 7218 /* 1. Allocate space for next generation rules_gen_X[] */
7219 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7220 int ret;
37082f93 7221
0cbc06b3
FW		 7222 if (trans->msg_type == NFT_MSG_NEWRULE ||
7223 trans->msg_type == NFT_MSG_DELRULE) {
7224 chain = trans->ctx.chain;
7225
7226 ret = nf_tables_commit_chain_prepare(net, chain);
7227 if (ret < 0) {
7228 nf_tables_commit_chain_prepare_cancel(net);
7229 return ret;
7230 }
7231 }
7232 }
37082f93 7233
0cbc06b3
FW		 7234 /* step 2. Make rules_gen_X visible to packet path */
7235 list_for_each_entry(table, &net->nft.tables, list) {
0fb39bbe
FW		 7236 list_for_each_entry(chain, &table->chains, list)
7237 nf_tables_commit_chain(net, chain);
0cbc06b3
FW		 7238 }
7239
7240 /*
7241 * Bump generation counter, invalidate any dump in progress.
7242 * Cannot fail after this point.
37082f93 7243 */
0cbc06b3
FW		 7244 while (++net->nft.base_seq == 0);
7245
7246 /* step 3. Start new generation, rules_gen_X now in use. */
7247 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 7248
7249 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 7250 switch (trans->msg_type) {
55dd6f93
PNA		 7251 case NFT_MSG_NEWTABLE:
7252 if (nft_trans_table_update(trans)) {
7253 if (!nft_trans_table_enable(trans)) {
664b0f8c 7254 nf_tables_table_disable(net,
55dd6f93
PNA		 7255 trans->ctx.table);
7256 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7257 }
7258 } else {
f2a6d766 7259 nft_clear(net, trans->ctx.table);
55dd6f93 7260 }
35151d84 7261 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 7262 nft_trans_destroy(trans);
7263 break;
7264 case NFT_MSG_DELTABLE:
f2a6d766 7265 list_del_rcu(&trans->ctx.table->list);
35151d84 7266 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 7267 break;
91c7b38d 7268 case NFT_MSG_NEWCHAIN:
9f8aac0b 7269 if (nft_trans_chain_update(trans)) {
91c7b38d 7270 nft_chain_commit_update(trans);
9f8aac0b
FW		 7271 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7272 /* trans destroyed after rcu grace period */
7273 } else {
66293c46 7274 nft_chain_commit_drop_policy(trans);
664b0f8c 7275 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 7276 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7277 nft_trans_destroy(trans);
7278 }
91c7b38d
PNA		 7279 break;
7280 case NFT_MSG_DELCHAIN:
1b2470e5 7281 nft_chain_del(trans->ctx.chain);
35151d84 7282 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 7283 nf_tables_unregister_hook(trans->ctx.net,
7284 trans->ctx.table,
7285 trans->ctx.chain);
91c7b38d 7286 break;
b380e5c7 7287 case NFT_MSG_NEWRULE:
889f7ee7 7288 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 7289 nf_tables_rule_notify(&trans->ctx,
37082f93 7290 nft_trans_rule(trans),
35151d84 7291 NFT_MSG_NEWRULE);
37082f93 7292 nft_trans_destroy(trans);
b380e5c7
PNA		 7293 break;
7294 case NFT_MSG_DELRULE:
7295 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 7296 nf_tables_rule_notify(&trans->ctx,
7297 nft_trans_rule(trans),
7298 NFT_MSG_DELRULE);
f6ac8585
PNA		 7299 nft_rule_expr_deactivate(&trans->ctx,
7300 nft_trans_rule(trans),
7301 NFT_TRANS_COMMIT);
b380e5c7 7302 break;
958bee14 7303 case NFT_MSG_NEWSET:
37a9cc52 7304 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 7305 /* This avoids hitting -EBUSY when deleting the table
7306 * from the transaction.
7307 */
408070d6 7308 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 7309 !list_empty(&nft_trans_set(trans)->bindings))
7310 trans->ctx.table->use--;
7311
958bee14 7312 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 7313 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 7314 nft_trans_destroy(trans);
7315 break;
7316 case NFT_MSG_DELSET:
37a9cc52 7317 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 7318 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 7319 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 7320 break;
60319eb1 7321 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 7322 te = (struct nft_trans_elem *)trans->data;
7323
42a55769 7324 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 7325 nf_tables_setelem_notify(&trans->ctx, te->set,
7326 &te->elem,
60319eb1
PNA		 7327 NFT_MSG_NEWSETELEM, 0);
7328 nft_trans_destroy(trans);
7329 break;
7330 case NFT_MSG_DELSETELEM:
a3716e70 7331 te = (struct nft_trans_elem *)trans->data;
fe2811eb 7332
a3716e70
PNA		 7333 nf_tables_setelem_notify(&trans->ctx, te->set,
7334 &te->elem,
60319eb1 7335 NFT_MSG_DELSETELEM, 0);
5cb82a38 7336 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 7337 atomic_dec(&te->set->nelems);
7338 te->set->ndeact--;
60319eb1 7339 break;
e5009240 7340 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 7341 if (nft_trans_obj_update(trans)) {
7342 nft_obj_commit_update(trans);
7343 nf_tables_obj_notify(&trans->ctx,
7344 nft_trans_obj(trans),
7345 NFT_MSG_NEWOBJ);
7346 } else {
7347 nft_clear(net, nft_trans_obj(trans));
7348 nf_tables_obj_notify(&trans->ctx,
7349 nft_trans_obj(trans),
7350 NFT_MSG_NEWOBJ);
7351 nft_trans_destroy(trans);
7352 }
e5009240
PNA		 7353 break;
7354 case NFT_MSG_DELOBJ:
d152159b 7355 nft_obj_del(nft_trans_obj(trans));
e5009240
PNA		 7356 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7357 NFT_MSG_DELOBJ);
7358 break;
3b49e2e9
PNA		 7359 case NFT_MSG_NEWFLOWTABLE:
7360 nft_clear(net, nft_trans_flowtable(trans));
7361 nf_tables_flowtable_notify(&trans->ctx,
7362 nft_trans_flowtable(trans),
7363 NFT_MSG_NEWFLOWTABLE);
7364 nft_trans_destroy(trans);
7365 break;
7366 case NFT_MSG_DELFLOWTABLE:
7367 list_del_rcu(&nft_trans_flowtable(trans)->list);
7368 nf_tables_flowtable_notify(&trans->ctx,
7369 nft_trans_flowtable(trans),
7370 NFT_MSG_DELFLOWTABLE);
7371 nft_unregister_flowtable_net_hooks(net,
7372 nft_trans_flowtable(trans));
7373 break;
37082f93 7374 }
37082f93
PNA		 7375 }
7376
84d7fce6 7377 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
0935d558 7378 nf_tables_commit_release(net);
37082f93
PNA		 7379
7380 return 0;
7381}
7382
eb014de4
PNA		 7383static void nf_tables_module_autoload(struct net *net)
7384{
7385 struct nft_module_request *req, *next;
7386 LIST_HEAD(module_list);
7387
7388 list_splice_init(&net->nft.module_list, &module_list);
7389 mutex_unlock(&net->nft.commit_mutex);
7390 list_for_each_entry_safe(req, next, &module_list, list) {
1d305ba4
FW		 7391 request_module("%s", req->module);
7392 req->done = true;
eb014de4
PNA		 7393 }
7394 mutex_lock(&net->nft.commit_mutex);
7395 list_splice(&module_list, &net->nft.module_list);
7396}
7397
b326dd37 7398static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 7399{
c7c32e72
PNA		 7400 switch (trans->msg_type) {
7401 case NFT_MSG_NEWTABLE:
7402 nf_tables_table_destroy(&trans->ctx);
7403 break;
7404 case NFT_MSG_NEWCHAIN:
43a605f2 7405 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 7406 break;
7407 case NFT_MSG_NEWRULE:
7408 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7409 break;
7410 case NFT_MSG_NEWSET:
40ba1d9b 7411 nft_set_destroy(nft_trans_set(trans));
c7c32e72 7412 break;
61edafbb
PM		 7413 case NFT_MSG_NEWSETELEM:
7414 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 7415 nft_trans_elem(trans).priv, true);
61edafbb 7416 break;
e5009240 7417 case NFT_MSG_NEWOBJ:
00bfb320 7418 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 7419 break;
3b49e2e9
PNA		 7420 case NFT_MSG_NEWFLOWTABLE:
7421 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7422 break;
c7c32e72
PNA		 7423 }
7424 kfree(trans);
7425}
7426
eb014de4 7427static int __nf_tables_abort(struct net *net, bool autoload)
37082f93 7428{
37082f93 7429 struct nft_trans *trans, *next;
02263db0 7430 struct nft_trans_elem *te;
37082f93 7431
a907e36d
XL		 7432 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
7433 list) {
b380e5c7 7434 switch (trans->msg_type) {
55dd6f93
PNA		 7435 case NFT_MSG_NEWTABLE:
7436 if (nft_trans_table_update(trans)) {
7437 if (nft_trans_table_enable(trans)) {
664b0f8c 7438 nf_tables_table_disable(net,
55dd6f93
PNA		 7439 trans->ctx.table);
7440 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7441 }
7442 nft_trans_destroy(trans);
7443 } else {
e688a7f8 7444 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 7445 }
7446 break;
7447 case NFT_MSG_DELTABLE:
f2a6d766 7448 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 7449 nft_trans_destroy(trans);
7450 break;
91c7b38d
PNA		 7451 case NFT_MSG_NEWCHAIN:
7452 if (nft_trans_chain_update(trans)) {
982f4051 7453 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 7454 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 7455 nft_trans_destroy(trans);
7456 } else {
4fefee57 7457 trans->ctx.table->use--;
1b2470e5 7458 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 7459 nf_tables_unregister_hook(trans->ctx.net,
7460 trans->ctx.table,
7461 trans->ctx.chain);
91c7b38d
PNA		 7462 }
7463 break;
7464 case NFT_MSG_DELCHAIN:
4fefee57 7465 trans->ctx.table->use++;
664b0f8c 7466 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 7467 nft_trans_destroy(trans);
7468 break;
b380e5c7 7469 case NFT_MSG_NEWRULE:
4fefee57 7470 trans->ctx.chain->use--;
b380e5c7 7471 list_del_rcu(&nft_trans_rule(trans)->list);
f6ac8585
PNA		 7472 nft_rule_expr_deactivate(&trans->ctx,
7473 nft_trans_rule(trans),
7474 NFT_TRANS_ABORT);
b380e5c7
PNA		 7475 break;
7476 case NFT_MSG_DELRULE:
4fefee57 7477 trans->ctx.chain->use++;
889f7ee7 7478 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 7479 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
37082f93 7480 nft_trans_destroy(trans);
b380e5c7 7481 break;
958bee14 7482 case NFT_MSG_NEWSET:
4fefee57 7483 trans->ctx.table->use--;
6a0a8d10 7484 if (nft_trans_set_bound(trans)) {
40ba1d9b
PNA		 7485 nft_trans_destroy(trans);
7486 break;
7487 }
7488 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 7489 break;
7490 case NFT_MSG_DELSET:
4fefee57 7491 trans->ctx.table->use++;
37a9cc52 7492 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 7493 nft_trans_destroy(trans);
7494 break;
60319eb1 7495 case NFT_MSG_NEWSETELEM:
6a0a8d10 7496 if (nft_trans_elem_set_bound(trans)) {
40ba1d9b
PNA		 7497 nft_trans_destroy(trans);
7498 break;
7499 }
02263db0 7500 te = (struct nft_trans_elem *)trans->data;
5cb82a38 7501 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 7502 atomic_dec(&te->set->nelems);
60319eb1
PNA		 7503 break;
7504 case NFT_MSG_DELSETELEM:
cc02e457
PM		 7505 te = (struct nft_trans_elem *)trans->data;
7506
59105446 7507 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 7508 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 7509 te->set->ndeact--;
cc02e457 7510
e5009240
PNA		 7511 nft_trans_destroy(trans);
7512 break;
7513 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 7514 if (nft_trans_obj_update(trans)) {
7515 kfree(nft_trans_obj_newobj(trans));
7516 nft_trans_destroy(trans);
7517 } else {
7518 trans->ctx.table->use--;
7519 nft_obj_del(nft_trans_obj(trans));
7520 }
e5009240
PNA		 7521 break;
7522 case NFT_MSG_DELOBJ:
7523 trans->ctx.table->use++;
7524 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 7525 nft_trans_destroy(trans);
7526 break;
3b49e2e9
PNA		 7527 case NFT_MSG_NEWFLOWTABLE:
7528 trans->ctx.table->use--;
7529 list_del_rcu(&nft_trans_flowtable(trans)->list);
7530 nft_unregister_flowtable_net_hooks(net,
7531 nft_trans_flowtable(trans));
7532 break;
7533 case NFT_MSG_DELFLOWTABLE:
7534 trans->ctx.table->use++;
7535 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
7536 nft_trans_destroy(trans);
7537 break;
37082f93 7538 }
37082f93
PNA		 7539 }
7540
b326dd37
PNA		 7541 synchronize_rcu();
7542
a1cee076
PNA		 7543 list_for_each_entry_safe_reverse(trans, next,
7544 &net->nft.commit_list, list) {
c7c32e72 7545 list_del(&trans->list);
b326dd37 7546 nf_tables_abort_release(trans);
37082f93
PNA		 7547 }
7548
eb014de4
PNA		 7549 if (autoload)
7550 nf_tables_module_autoload(net);
7551 else
7552 nf_tables_module_autoload_cleanup(net);
7553
37082f93
PNA		 7554 return 0;
7555}
7556
a654de8f
PNA		 7557static void nf_tables_cleanup(struct net *net)
7558{
7559 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
7560}
7561
eb014de4 7562static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
71ad00c5 7563{
eb014de4 7564 int ret = __nf_tables_abort(net, autoload);
f102d66b
FW		 7565
7566 mutex_unlock(&net->nft.commit_mutex);
7567
7568 return ret;
71ad00c5
FW		 7569}
7570
74e8bcd2
PNA		 7571static bool nf_tables_valid_genid(struct net *net, u32 genid)
7572{
f102d66b
FW		 7573 bool genid_ok;
7574
7575 mutex_lock(&net->nft.commit_mutex);
7576
7577 genid_ok = genid == 0 || net->nft.base_seq == genid;
7578 if (!genid_ok)
7579 mutex_unlock(&net->nft.commit_mutex);
7580
7581 /* else, commit mutex has to be released by commit or abort function */
7582 return genid_ok;
74e8bcd2
PNA		 7583}
7584
96518518
PM		 7585static const struct nfnetlink_subsystem nf_tables_subsys = {
7586 .name = "nf_tables",
7587 .subsys_id = NFNL_SUBSYS_NFTABLES,
7588 .cb_count = NFT_MSG_MAX,
7589 .cb = nf_tables_cb,
0628b123
PNA		 7590 .commit = nf_tables_commit,
7591 .abort = nf_tables_abort,
a654de8f 7592 .cleanup = nf_tables_cleanup,
74e8bcd2 7593 .valid_genid = nf_tables_valid_genid,
be2ab5b4 7594 .owner = THIS_MODULE,
96518518
PM		 7595};
7596
7210e4e3 7597int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 7598 enum nft_chain_types type)
7210e4e3
PNA		 7599{
7600 const struct nft_base_chain *basechain;
7601
f323d954 7602 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 7603 basechain = nft_base_chain(chain);
7604 if (basechain->type->type != type)
7605 return -EOPNOTSUPP;
7606 }
7607 return 0;
7608}
7609EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7610
75e8d06d
PNA		 7611int nft_chain_validate_hooks(const struct nft_chain *chain,
7612 unsigned int hook_flags)
7613{
7614 struct nft_base_chain *basechain;
7615
f323d954 7616 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 7617 basechain = nft_base_chain(chain);
7618
c974a3a3 7619 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 7620 return 0;
7621
7622 return -EOPNOTSUPP;
7623 }
7624
7625 return 0;
7626}
7627EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7628
20a69341
PM		 7629/*
7630 * Loop detection - walk through the ruleset beginning at the destination chain
7631 * of a new jump until either the source chain is reached (loop) or all
7632 * reachable chains have been traversed.
7633 *
7634 * The loop check is performed whenever a new jump verdict is added to an
7635 * expression or verdict map or a verdict map is bound to a new chain.
7636 */
7637
7638static int nf_tables_check_loops(const struct nft_ctx *ctx,
7639 const struct nft_chain *chain);
7640
7641static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 7642 struct nft_set *set,
20a69341 7643 const struct nft_set_iter *iter,
de70185d 7644 struct nft_set_elem *elem)
20a69341 7645{
fe2811eb
PM		 7646 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7647 const struct nft_data *data;
7648
7649 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7650 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 7651 return 0;
7652
fe2811eb 7653 data = nft_set_ext_data(ext);
1ca2e170 7654 switch (data->verdict.code) {
20a69341
PM		 7655 case NFT_JUMP:
7656 case NFT_GOTO:
1ca2e170 7657 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 7658 default:
7659 return 0;
7660 }
7661}
7662
7663static int nf_tables_check_loops(const struct nft_ctx *ctx,
7664 const struct nft_chain *chain)
7665{
7666 const struct nft_rule *rule;
7667 const struct nft_expr *expr, *last;
de70185d 7668 struct nft_set *set;
20a69341
PM		 7669 struct nft_set_binding *binding;
7670 struct nft_set_iter iter;
20a69341
PM		 7671
7672 if (ctx->chain == chain)
7673 return -ELOOP;
7674
7675 list_for_each_entry(rule, &chain->rules, list) {
7676 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 7677 struct nft_immediate_expr *priv;
7678 const struct nft_data *data;
0ca743a5
PNA		 7679 int err;
7680
a654de8f 7681 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 7682 continue;
7683
a654de8f
PNA		 7684 priv = nft_expr_priv(expr);
7685 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 7686 continue;
20a69341 7687
a654de8f 7688 data = &priv->data;
1ca2e170 7689 switch (data->verdict.code) {
20a69341
PM		 7690 case NFT_JUMP:
7691 case NFT_GOTO:
1ca2e170
PM		 7692 err = nf_tables_check_loops(ctx,
7693 data->verdict.chain);
20a69341
PM		 7694 if (err < 0)
7695 return err;
7696 default:
7697 break;
7698 }
7699 }
7700 }
7701
7702 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 7703 if (!nft_is_active_next(ctx->net, set))
7704 continue;
20a69341
PM		 7705 if (!(set->flags & NFT_SET_MAP) ||
7706 set->dtype != NFT_DATA_VERDICT)
7707 continue;
7708
7709 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 7710 if (!(binding->flags & NFT_SET_MAP) ||
7711 binding->chain != chain)
20a69341
PM		 7712 continue;
7713
8588ac09 7714 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 7715 iter.skip = 0;
7716 iter.count = 0;
7717 iter.err = 0;
7718 iter.fn = nf_tables_loop_check_setelem;
7719
7720 set->ops->walk(ctx, set, &iter);
7721 if (iter.err < 0)
7722 return iter.err;
7723 }
7724 }
7725
7726 return 0;
7727}
7728
36b701fa
LGL		 7729/**
7730 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
7731 *
7732 * @attr: netlink attribute to fetch value from
7733 * @max: maximum value to be stored in dest
7734 * @dest: pointer to the variable
7735 *
7736 * Parse, check and store a given u32 netlink attribute into variable.
7737 * This function returns -ERANGE if the value goes over maximum value.
7738 * Otherwise a 0 is returned and the attribute value is stored in the
7739 * destination variable.
7740 */
f1d505bb 7741int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 7742{
09525a09 7743 u32 val;
36b701fa
LGL		 7744
7745 val = ntohl(nla_get_be32(attr));
7746 if (val > max)
7747 return -ERANGE;
7748
7749 *dest = val;
7750 return 0;
7751}
7752EXPORT_SYMBOL_GPL(nft_parse_u32_check);
7753
49499c3e
PM		 7754/**
7755 * nft_parse_register - parse a register value from a netlink attribute
7756 *
7757 * @attr: netlink attribute
7758 *
7759 * Parse and translate a register value from a netlink attribute.
7760 * Registers used to be 128 bit wide, these register numbers will be
7761 * mapped to the corresponding 32 bit register numbers.
7762 */
b1c96ed3
PM		 7763unsigned int nft_parse_register(const struct nlattr *attr)
7764{
49499c3e
PM		 7765 unsigned int reg;
7766
7767 reg = ntohl(nla_get_be32(attr));
7768 switch (reg) {
7769 case NFT_REG_VERDICT...NFT_REG_4:
7770 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
7771 default:
7772 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
7773 }
b1c96ed3
PM		 7774}
7775EXPORT_SYMBOL_GPL(nft_parse_register);
7776
49499c3e
PM		 7777/**
7778 * nft_dump_register - dump a register value to a netlink attribute
7779 *
7780 * @skb: socket buffer
7781 * @attr: attribute number
7782 * @reg: register number
7783 *
7784 * Construct a netlink attribute containing the register number. For
7785 * compatibility reasons, register numbers being a multiple of 4 are
7786 * translated to the corresponding 128 bit register numbers.
7787 */
b1c96ed3
PM		 7788int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
7789{
49499c3e
PM		 7790 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
7791 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
7792 else
7793 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
7794
b1c96ed3
PM		 7795 return nla_put_be32(skb, attr, htonl(reg));
7796}
7797EXPORT_SYMBOL_GPL(nft_dump_register);
7798
96518518 7799/**
d07db988 7800 * nft_validate_register_load - validate a load from a register
96518518
PM		 7801 *
7802 * @reg: the register number
d07db988 7803 * @len: the length of the data
96518518
PM		 7804 *
7805 * Validate that the input register is one of the general purpose
d07db988 7806 * registers and that the length of the load is within the bounds.
96518518 7807 */
d07db988 7808int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 7809{
49499c3e 7810 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 7811 return -EINVAL;
d07db988
PM		 7812 if (len == 0)
7813 return -EINVAL;
c593642c 7814 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
d07db988 7815 return -ERANGE;
49499c3e 7816
96518518
PM		 7817 return 0;
7818}
d07db988 7819EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 7820
96518518 7821/**
1ec10212 7822 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 7823 *
7824 * @ctx: context of the expression performing the load
7825 * @reg: the destination register number
7826 * @data: the data to load
7827 * @type: the data type
45d9bcda 7828 * @len: the length of the data
96518518
PM		 7829 *
7830 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 7831 * the destination register and the length is within the bounds.
7832 * A value of NULL for the data means that its runtime gathered
58f40ab6 7833 * data.
96518518 7834 */
1ec10212
PM		 7835int nft_validate_register_store(const struct nft_ctx *ctx,
7836 enum nft_registers reg,
7837 const struct nft_data *data,
7838 enum nft_data_types type, unsigned int len)
96518518 7839{
20a69341
PM		 7840 int err;
7841
96518518
PM		 7842 switch (reg) {
7843 case NFT_REG_VERDICT:
58f40ab6 7844 if (type != NFT_DATA_VERDICT)
96518518 7845 return -EINVAL;
20a69341 7846
58f40ab6 7847 if (data != NULL &&
1ca2e170
PM		 7848 (data->verdict.code == NFT_GOTO ||
7849 data->verdict.code == NFT_JUMP)) {
7850 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 7851 if (err < 0)
7852 return err;
20a69341
PM		 7853 }
7854
96518518
PM		 7855 return 0;
7856 default:
49499c3e 7857 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 7858 return -EINVAL;
45d9bcda
PM		 7859 if (len == 0)
7860 return -EINVAL;
49499c3e 7861 if (reg * NFT_REG32_SIZE + len >
c593642c 7862 sizeof_field(struct nft_regs, data))
45d9bcda 7863 return -ERANGE;
27e6d201 7864
96518518
PM		 7865 if (data != NULL && type != NFT_DATA_VALUE)
7866 return -EINVAL;
7867 return 0;
7868 }
7869}
1ec10212 7870EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 7871
7872static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
7873 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
7874 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
7875 .len = NFT_CHAIN_MAXNAMELEN - 1 },
7876};
7877
7878static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
7879 struct nft_data_desc *desc, const struct nlattr *nla)
7880{
664b0f8c 7881 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 7882 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
7883 struct nft_chain *chain;
7884 int err;
7885
8cb08174
JB		 7886 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
7887 nft_verdict_policy, NULL);
96518518
PM		 7888 if (err < 0)
7889 return err;
7890
7891 if (!tb[NFTA_VERDICT_CODE])
7892 return -EINVAL;
1ca2e170 7893 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 7894
1ca2e170 7895 switch (data->verdict.code) {
e0abdadc 7896 default:
1ca2e170 7897 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 7898 case NF_ACCEPT:
7899 case NF_DROP:
7900 case NF_QUEUE:
7901 break;
7902 default:
7903 return -EINVAL;
7904 }
7905 /* fall through */
96518518
PM		 7906 case NFT_CONTINUE:
7907 case NFT_BREAK:
7908 case NFT_RETURN:
96518518
PM		 7909 break;
7910 case NFT_JUMP:
7911 case NFT_GOTO:
7912 if (!tb[NFTA_VERDICT_CHAIN])
7913 return -EINVAL;
f102d66b
FW		 7914 chain = nft_chain_lookup(ctx->net, ctx->table,
7915 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 7916 if (IS_ERR(chain))
7917 return PTR_ERR(chain);
f323d954 7918 if (nft_is_base_chain(chain))
96518518
PM		 7919 return -EOPNOTSUPP;
7920
96518518 7921 chain->use++;
1ca2e170 7922 data->verdict.chain = chain;
96518518 7923 break;
96518518
PM		 7924 }
7925
4c4ed074 7926 desc->len = sizeof(data->verdict);
96518518
PM		 7927 desc->type = NFT_DATA_VERDICT;
7928 return 0;
7929}
7930
7931static void nft_verdict_uninit(const struct nft_data *data)
7932{
1ca2e170 7933 switch (data->verdict.code) {
96518518
PM		 7934 case NFT_JUMP:
7935 case NFT_GOTO:
1ca2e170 7936 data->verdict.chain->use--;
96518518
PM		 7937 break;
7938 }
7939}
7940
33d5a7b1 7941int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 7942{
7943 struct nlattr *nest;
7944
ae0be8de 7945 nest = nla_nest_start_noflag(skb, type);
96518518
PM		 7946 if (!nest)
7947 goto nla_put_failure;
7948
33d5a7b1 7949 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 7950 goto nla_put_failure;
7951
33d5a7b1 7952 switch (v->code) {
96518518
PM		 7953 case NFT_JUMP:
7954 case NFT_GOTO:
1ca2e170 7955 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 7956 v->chain->name))
96518518
PM		 7957 goto nla_put_failure;
7958 }
7959 nla_nest_end(skb, nest);
7960 return 0;
7961
7962nla_put_failure:
7963 return -1;
7964}
7965
d0a11fc3
PM		 7966static int nft_value_init(const struct nft_ctx *ctx,
7967 struct nft_data *data, unsigned int size,
96518518
PM		 7968 struct nft_data_desc *desc, const struct nlattr *nla)
7969{
7970 unsigned int len;
7971
7972 len = nla_len(nla);
7973 if (len == 0)
7974 return -EINVAL;
d0a11fc3 7975 if (len > size)
96518518
PM		 7976 return -EOVERFLOW;
7977
d0a11fc3 7978 nla_memcpy(data->data, nla, len);
96518518
PM		 7979 desc->type = NFT_DATA_VALUE;
7980 desc->len = len;
7981 return 0;
7982}
7983
7984static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
7985 unsigned int len)
7986{
7987 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
7988}
7989
7990static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 7991 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 7992 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
7993};
7994
7995/**
7996 * nft_data_init - parse nf_tables data netlink attributes
7997 *
7998 * @ctx: context of the expression using the data
7999 * @data: destination struct nft_data
d0a11fc3 8000 * @size: maximum data length
96518518
PM		 8001 * @desc: data description
8002 * @nla: netlink attribute containing data
8003 *
8004 * Parse the netlink data attributes and initialize a struct nft_data.
8005 * The type and length of data are returned in the data description.
8006 *
8007 * The caller can indicate that it only wants to accept data of type
8008 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8009 */
d0a11fc3
PM		 8010int nft_data_init(const struct nft_ctx *ctx,
8011 struct nft_data *data, unsigned int size,
96518518
PM		 8012 struct nft_data_desc *desc, const struct nlattr *nla)
8013{
8014 struct nlattr *tb[NFTA_DATA_MAX + 1];
8015 int err;
8016
8cb08174
JB		 8017 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8018 nft_data_policy, NULL);
96518518
PM		 8019 if (err < 0)
8020 return err;
8021
8022 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 8023 return nft_value_init(ctx, data, size, desc,
8024 tb[NFTA_DATA_VALUE]);
96518518
PM		 8025 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8026 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8027 return -EINVAL;
8028}
8029EXPORT_SYMBOL_GPL(nft_data_init);
8030
8031/**
59105446 8032 * nft_data_release - release a nft_data item
96518518
PM		 8033 *
8034 * @data: struct nft_data to release
8035 * @type: type of data
8036 *
8037 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8038 * all others need to be released by calling this function.
8039 */
59105446 8040void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 8041{
960bd2c2 8042 if (type < NFT_DATA_VERDICT)
96518518 8043 return;
960bd2c2 8044 switch (type) {
96518518
PM		 8045 case NFT_DATA_VERDICT:
8046 return nft_verdict_uninit(data);
8047 default:
8048 WARN_ON(1);
8049 }
8050}
59105446 8051EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 8052
8053int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8054 enum nft_data_types type, unsigned int len)
8055{
8056 struct nlattr *nest;
8057 int err;
8058
ae0be8de 8059 nest = nla_nest_start_noflag(skb, attr);
96518518
PM		 8060 if (nest == NULL)
8061 return -1;
8062
8063 switch (type) {
8064 case NFT_DATA_VALUE:
8065 err = nft_value_dump(skb, data, len);
8066 break;
8067 case NFT_DATA_VERDICT:
33d5a7b1 8068 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 8069 break;
8070 default:
8071 err = -EINVAL;
8072 WARN_ON(1);
8073 }
8074
8075 nla_nest_end(skb, nest);
8076 return err;
8077}
8078EXPORT_SYMBOL_GPL(nft_data_dump);
8079
5ebe0b0e
PNA		 8080int __nft_release_basechain(struct nft_ctx *ctx)
8081{
8082 struct nft_rule *rule, *nr;
8083
fa5950e4
FW		 8084 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8085 return 0;
5ebe0b0e 8086
c974a3a3 8087 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 8088 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8089 list_del(&rule->list);
8090 ctx->chain->use--;
bb7b40ae 8091 nf_tables_rule_release(ctx, rule);
5ebe0b0e 8092 }
1b2470e5 8093 nft_chain_del(ctx->chain);
5ebe0b0e 8094 ctx->table->use--;
43a605f2 8095 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 8096
8097 return 0;
8098}
8099EXPORT_SYMBOL_GPL(__nft_release_basechain);
8100
98319cb9 8101static void __nft_release_tables(struct net *net)
df05ef87 8102{
3b49e2e9 8103 struct nft_flowtable *flowtable, *nf;
df05ef87
PNA		 8104 struct nft_table *table, *nt;
8105 struct nft_chain *chain, *nc;
e5009240 8106 struct nft_object *obj, *ne;
df05ef87
PNA		 8107 struct nft_rule *rule, *nr;
8108 struct nft_set *set, *ns;
8109 struct nft_ctx ctx = {
8110 .net = net,
43a605f2 8111 .family = NFPROTO_NETDEV,
df05ef87
PNA		 8112 };
8113
36596dad 8114 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
98319cb9 8115 ctx.family = table->family;
dd4cbef7 8116
df05ef87 8117 list_for_each_entry(chain, &table->chains, list)
c974a3a3 8118 nf_tables_unregister_hook(net, table, chain);
df05ef87
PNA		 8119 /* No packets are walking on these chains anymore. */
8120 ctx.table = table;
8121 list_for_each_entry(chain, &table->chains, list) {
8122 ctx.chain = chain;
8123 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8124 list_del(&rule->list);
8125 chain->use--;
bb7b40ae 8126 nf_tables_rule_release(&ctx, rule);
df05ef87
PNA		 8127 }
8128 }
3b49e2e9
PNA		 8129 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8130 list_del(&flowtable->list);
8131 table->use--;
8132 nf_tables_flowtable_destroy(flowtable);
8133 }
df05ef87
PNA		 8134 list_for_each_entry_safe(set, ns, &table->sets, list) {
8135 list_del(&set->list);
8136 table->use--;
8137 nft_set_destroy(set);
8138 }
e5009240 8139 list_for_each_entry_safe(obj, ne, &table->objects, list) {
d152159b 8140 nft_obj_del(obj);
e5009240 8141 table->use--;
00bfb320 8142 nft_obj_destroy(&ctx, obj);
e5009240 8143 }
df05ef87 8144 list_for_each_entry_safe(chain, nc, &table->chains, list) {
43a605f2 8145 ctx.chain = chain;
1b2470e5 8146 nft_chain_del(chain);
df05ef87 8147 table->use--;
43a605f2 8148 nf_tables_chain_destroy(&ctx);
df05ef87
PNA		 8149 }
8150 list_del(&table->list);
8151 nf_tables_table_destroy(&ctx);
8152 }
8153}
8154
dd4cbef7
PNA		 8155static int __net_init nf_tables_init_net(struct net *net)
8156{
8157 INIT_LIST_HEAD(&net->nft.tables);
8158 INIT_LIST_HEAD(&net->nft.commit_list);
eb014de4 8159 INIT_LIST_HEAD(&net->nft.module_list);
f102d66b 8160 mutex_init(&net->nft.commit_mutex);
dd4cbef7 8161 net->nft.base_seq = 1;
a654de8f
PNA		 8162 net->nft.validate_state = NFT_VALIDATE_SKIP;
8163
dd4cbef7
PNA		 8164 return 0;
8165}
8166
8167static void __net_exit nf_tables_exit_net(struct net *net)
8168{
f102d66b 8169 mutex_lock(&net->nft.commit_mutex);
71ad00c5 8170 if (!list_empty(&net->nft.commit_list))
eb014de4 8171 __nf_tables_abort(net, false);
98319cb9 8172 __nft_release_tables(net);
f102d66b 8173 mutex_unlock(&net->nft.commit_mutex);
dd4cbef7 8174 WARN_ON_ONCE(!list_empty(&net->nft.tables));
1d305ba4 8175 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
dd4cbef7
PNA		 8176}
8177
99633ab2
PNA		 8178static struct pernet_operations nf_tables_net_ops = {
8179 .init = nf_tables_init_net,
613d0776 8180 .exit = nf_tables_exit_net,
99633ab2
PNA		 8181};
8182
96518518
PM		 8183static int __init nf_tables_module_init(void)
8184{
8185 int err;
8186
0935d558 8187 spin_lock_init(&nf_tables_destroy_list_lock);
d209df3e
FW		 8188 err = register_pernet_subsys(&nf_tables_net_ops);
8189 if (err < 0)
8190 return err;
8191
8192 err = nft_chain_filter_init();
8193 if (err < 0)
8194 goto err1;
02c7b25e 8195
96518518
PM		 8196 err = nf_tables_core_module_init();
8197 if (err < 0)
d209df3e 8198 goto err2;
96518518 8199
d209df3e 8200 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
96518518 8201 if (err < 0)
d209df3e 8202 goto err3;
96518518 8203
4d44175a
FW		 8204 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8205 if (err < 0)
8206 goto err4;
8207
06d392cb 8208 err = nft_offload_init();
8209 if (err < 0)
8210 goto err5;
8211
d209df3e
FW		 8212 /* must be last */
8213 err = nfnetlink_subsys_register(&nf_tables_subsys);
8214 if (err < 0)
06d392cb 8215 goto err6;
3b49e2e9 8216
c1deb065 8217 nft_chain_route_init();
3474a2c6 8218
d209df3e 8219 return err;
06d392cb 8220err6:
8221 nft_offload_exit();
4d44175a
FW		 8222err5:
8223 rhltable_destroy(&nft_objname_ht);
d209df3e
FW		 8224err4:
8225 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8226err3:
96518518 8227 nf_tables_core_module_exit();
d209df3e
FW		 8228err2:
8229 nft_chain_filter_fini();
8230err1:
8231 unregister_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 8232 return err;
8233}
8234
8235static void __exit nf_tables_module_exit(void)
8236{
8237 nfnetlink_subsys_unregister(&nf_tables_subsys);
06d392cb 8238 nft_offload_exit();
3b49e2e9 8239 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 8240 nft_chain_filter_fini();
c1deb065 8241 nft_chain_route_fini();
71ad00c5 8242 unregister_pernet_subsys(&nf_tables_net_ops);
0935d558 8243 cancel_work_sync(&trans_destroy_work);
1b1bc49c 8244 rcu_barrier();
4d44175a 8245 rhltable_destroy(&nft_objname_ht);
96518518 8246 nf_tables_core_module_exit();
96518518
PM		 8247}
8248
8249module_init(nf_tables_module_init);
8250module_exit(nf_tables_module_exit);
8251
8252MODULE_LICENSE("GPL");
8253MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8254MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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