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netfilter: nf_tables: add NFTA_CHAIN_ID attribute
[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 282
74cccc3d 283 if (msg_type == NFT_MSG_NEWCHAIN) {
664b0f8c 284 nft_activate_next(ctx->net, ctx->chain);
ee01d542 285
74cccc3d
PNA		 286 if (ctx->nla[NFTA_CHAIN_ID]) {
287 nft_trans_chain_id(trans) =
288 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
289 }
290 }
291
ee01d542 292 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
66293c46 293 return trans;
ee01d542
AB		 294}
295
296static int nft_delchain(struct nft_ctx *ctx)
297{
66293c46 298 struct nft_trans *trans;
ee01d542 299
66293c46
FW		 300 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
301 if (IS_ERR(trans))
302 return PTR_ERR(trans);
ee01d542
AB		 303
304 ctx->table->use--;
664b0f8c 305 nft_deactivate_next(ctx->net, ctx->chain);
ee01d542 306
66293c46 307 return 0;
ee01d542
AB		 308}
309
bb7b40ae
PNA		 310static void nft_rule_expr_activate(const struct nft_ctx *ctx,
311 struct nft_rule *rule)
312{
313 struct nft_expr *expr;
314
315 expr = nft_expr_first(rule);
316 while (expr != nft_expr_last(rule) && expr->ops) {
317 if (expr->ops->activate)
318 expr->ops->activate(ctx, expr);
319
320 expr = nft_expr_next(expr);
321 }
322}
323
324static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
f6ac8585
PNA		 325 struct nft_rule *rule,
326 enum nft_trans_phase phase)
bb7b40ae
PNA		 327{
328 struct nft_expr *expr;
329
330 expr = nft_expr_first(rule);
331 while (expr != nft_expr_last(rule) && expr->ops) {
332 if (expr->ops->deactivate)
f6ac8585 333 expr->ops->deactivate(ctx, expr, phase);
bb7b40ae
PNA		 334
335 expr = nft_expr_next(expr);
336 }
337}
338
ee01d542
AB		 339static int
340nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
341{
342 /* You cannot delete the same rule twice */
889f7ee7
PNA		 343 if (nft_is_active_next(ctx->net, rule)) {
344 nft_deactivate_next(ctx->net, rule);
ee01d542
AB		 345 ctx->chain->use--;
346 return 0;
347 }
348 return -ENOENT;
349}
350
351static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
352 struct nft_rule *rule)
353{
354 struct nft_trans *trans;
355
356 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
357 if (trans == NULL)
358 return NULL;
359
1a94e38d
PNA		 360 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
361 nft_trans_rule_id(trans) =
362 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
363 }
ee01d542
AB		 364 nft_trans_rule(trans) = rule;
365 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
366
367 return trans;
368}
369
370static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
371{
63b48c73 372 struct nft_flow_rule *flow;
ee01d542
AB		 373 struct nft_trans *trans;
374 int err;
375
376 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
377 if (trans == NULL)
378 return -ENOMEM;
379
63b48c73
PNA		 380 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
381 flow = nft_flow_rule_create(ctx->net, rule);
382 if (IS_ERR(flow)) {
383 nft_trans_destroy(trans);
384 return PTR_ERR(flow);
385 }
386
387 nft_trans_flow_rule(trans) = flow;
388 }
389
ee01d542
AB		 390 err = nf_tables_delrule_deactivate(ctx, rule);
391 if (err < 0) {
392 nft_trans_destroy(trans);
393 return err;
394 }
f6ac8585 395 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
ee01d542
AB		 396
397 return 0;
398}
399
400static int nft_delrule_by_chain(struct nft_ctx *ctx)
401{
402 struct nft_rule *rule;
403 int err;
404
405 list_for_each_entry(rule, &ctx->chain->rules, list) {
23b7ca4f
PNA		 406 if (!nft_is_active_next(ctx->net, rule))
407 continue;
408
ee01d542
AB		 409 err = nft_delrule(ctx, rule);
410 if (err < 0)
411 return err;
412 }
413 return 0;
414}
415
cd5125d8 416static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
ee01d542
AB		 417 struct nft_set *set)
418{
419 struct nft_trans *trans;
420
421 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
422 if (trans == NULL)
423 return -ENOMEM;
424
425 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
426 nft_trans_set_id(trans) =
427 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
37a9cc52 428 nft_activate_next(ctx->net, set);
ee01d542
AB		 429 }
430 nft_trans_set(trans) = set;
431 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
432
433 return 0;
434}
435
cd5125d8 436static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
ee01d542
AB		 437{
438 int err;
439
440 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
441 if (err < 0)
442 return err;
443
37a9cc52 444 nft_deactivate_next(ctx->net, set);
ee01d542
AB		 445 ctx->table->use--;
446
447 return err;
448}
449
e5009240
PNA		 450static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
451 struct nft_object *obj)
452{
453 struct nft_trans *trans;
454
455 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
456 if (trans == NULL)
457 return -ENOMEM;
458
459 if (msg_type == NFT_MSG_NEWOBJ)
460 nft_activate_next(ctx->net, obj);
461
462 nft_trans_obj(trans) = obj;
463 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
464
465 return 0;
466}
467
468static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
469{
470 int err;
471
472 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
473 if (err < 0)
474 return err;
475
476 nft_deactivate_next(ctx->net, obj);
477 ctx->table->use--;
478
479 return err;
480}
481
3b49e2e9
PNA		 482static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
483 struct nft_flowtable *flowtable)
484{
485 struct nft_trans *trans;
486
487 trans = nft_trans_alloc(ctx, msg_type,
488 sizeof(struct nft_trans_flowtable));
489 if (trans == NULL)
490 return -ENOMEM;
491
492 if (msg_type == NFT_MSG_NEWFLOWTABLE)
493 nft_activate_next(ctx->net, flowtable);
494
495 nft_trans_flowtable(trans) = flowtable;
496 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
497
498 return 0;
499}
500
501static int nft_delflowtable(struct nft_ctx *ctx,
502 struct nft_flowtable *flowtable)
503{
504 int err;
505
506 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
507 if (err < 0)
508 return err;
509
510 nft_deactivate_next(ctx->net, flowtable);
511 ctx->table->use--;
512
513 return err;
514}
515
96518518
PM		 516/*
517 * Tables
518 */
519
36596dad 520static struct nft_table *nft_table_lookup(const struct net *net,
f2a6d766 521 const struct nlattr *nla,
36596dad 522 u8 family, u8 genmask)
96518518
PM		 523{
524 struct nft_table *table;
525
cac20fcd
PNA		 526 if (nla == NULL)
527 return ERR_PTR(-EINVAL);
528
0a6a9515
QC		 529 list_for_each_entry_rcu(table, &net->nft.tables, list,
530 lockdep_is_held(&net->nft.commit_mutex)) {
f2a6d766 531 if (!nla_strcmp(nla, table->name) &&
98319cb9 532 table->family == family &&
f2a6d766 533 nft_active_genmask(table, genmask))
96518518
PM		 534 return table;
535 }
cac20fcd
PNA		 536
537 return ERR_PTR(-ENOENT);
96518518
PM		 538}
539
3ecbfd65
HS		 540static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
541 const struct nlattr *nla,
542 u8 genmask)
543{
544 struct nft_table *table;
545
546 list_for_each_entry(table, &net->nft.tables, list) {
547 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
548 nft_active_genmask(table, genmask))
549 return table;
550 }
3ecbfd65
HS		 551
552 return ERR_PTR(-ENOENT);
553}
554
96518518
PM		 555static inline u64 nf_tables_alloc_handle(struct nft_table *table)
556{
557 return ++table->hgenerator;
558}
559
32537e91 560static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
9370761c 561
82603549
PNA		 562static const struct nft_chain_type *
563__nft_chain_type_get(u8 family, enum nft_chain_types type)
564{
565 if (family >= NFPROTO_NUMPROTO ||
566 type >= NFT_CHAIN_T_MAX)
567 return NULL;
568
569 return chain_type[family][type];
570}
571
32537e91 572static const struct nft_chain_type *
1ea26cca 573__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
9370761c 574{
82603549 575 const struct nft_chain_type *type;
9370761c
PNA		 576 int i;
577
baae3e62 578 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
82603549
PNA		 579 type = __nft_chain_type_get(family, i);
580 if (!type)
581 continue;
582 if (!nla_strcmp(nla, type->name))
583 return type;
9370761c 584 }
baae3e62 585 return NULL;
9370761c
PNA		 586}
587
eb014de4
PNA		 588struct nft_module_request {
589 struct list_head list;
590 char module[MODULE_NAME_LEN];
591 bool done;
592};
593
452238e8 594#ifdef CONFIG_MODULES
eb014de4 595static int nft_request_module(struct net *net, const char *fmt, ...)
452238e8
FW		 596{
597 char module_name[MODULE_NAME_LEN];
eb014de4 598 struct nft_module_request *req;
452238e8
FW		 599 va_list args;
600 int ret;
601
452238e8
FW		 602 va_start(args, fmt);
603 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
604 va_end(args);
9332d27d 605 if (ret >= MODULE_NAME_LEN)
eb014de4 606 return 0;
452238e8 607
eb014de4
PNA		 608 list_for_each_entry(req, &net->nft.module_list, list) {
609 if (!strcmp(req->module, module_name)) {
610 if (req->done)
611 return 0;
ec7470b8 612
eb014de4
PNA		 613 /* A request to load this module already exists. */
614 return -EAGAIN;
615 }
616 }
617
618 req = kmalloc(sizeof(*req), GFP_KERNEL);
619 if (!req)
620 return -ENOMEM;
621
622 req->done = false;
623 strlcpy(req->module, module_name, MODULE_NAME_LEN);
624 list_add_tail(&req->list, &net->nft.module_list);
625
626 return -EAGAIN;
452238e8
FW		 627}
628#endif
629
f102d66b
FW		 630static void lockdep_nfnl_nft_mutex_not_held(void)
631{
632#ifdef CONFIG_PROVE_LOCKING
633 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
634#endif
635}
636
32537e91 637static const struct nft_chain_type *
452238e8
FW		 638nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
639 u8 family, bool autoload)
9370761c 640{
32537e91 641 const struct nft_chain_type *type;
9370761c 642
1ea26cca 643 type = __nf_tables_chain_type_lookup(nla, family);
93b0806f
PM		 644 if (type != NULL)
645 return type;
f102d66b
FW		 646
647 lockdep_nfnl_nft_mutex_not_held();
9370761c 648#ifdef CONFIG_MODULES
93b0806f 649 if (autoload) {
eb014de4
PNA		 650 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
651 nla_len(nla),
652 (const char *)nla_data(nla)) == -EAGAIN)
93b0806f 653 return ERR_PTR(-EAGAIN);
9370761c
PNA		 654 }
655#endif
93b0806f 656 return ERR_PTR(-ENOENT);
9370761c
PNA		 657}
658
96518518 659static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
1cae565e
PNA		 660 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
661 .len = NFT_TABLE_MAXNAMELEN - 1 },
9ddf6323 662 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
3ecbfd65 663 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
96518518
PM		 664};
665
84d7fce6
PNA		 666static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
667 u32 portid, u32 seq, int event, u32 flags,
668 int family, const struct nft_table *table)
96518518
PM		 669{
670 struct nlmsghdr *nlh;
671 struct nfgenmsg *nfmsg;
672
dedb67c4 673 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 674 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
675 if (nlh == NULL)
676 goto nla_put_failure;
677
678 nfmsg = nlmsg_data(nlh);
679 nfmsg->nfgen_family = family;
680 nfmsg->version = NFNETLINK_V0;
84d7fce6 681 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518 682
9ddf6323 683 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
d8bcc768 684 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
3ecbfd65
HS		 685 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
686 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
687 NFTA_TABLE_PAD))
96518518
PM		 688 goto nla_put_failure;
689
053c095a
JB		 690 nlmsg_end(skb, nlh);
691 return 0;
96518518
PM		 692
693nla_put_failure:
694 nlmsg_trim(skb, nlh);
695 return -1;
696}
697
25e94a99 698static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 699{
700 struct sk_buff *skb;
96518518
PM		 701 int err;
702
128ad332
PNA		 703 if (!ctx->report &&
704 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 705 return;
96518518 706
96518518
PM		 707 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
708 if (skb == NULL)
709 goto err;
710
84d7fce6 711 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 712 event, 0, ctx->family, ctx->table);
96518518
PM		 713 if (err < 0) {
714 kfree_skb(skb);
715 goto err;
716 }
717
25e94a99
PNA		 718 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
719 ctx->report, GFP_KERNEL);
720 return;
96518518 721err:
25e94a99 722 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 723}
724
725static int nf_tables_dump_tables(struct sk_buff *skb,
726 struct netlink_callback *cb)
727{
728 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 729 const struct nft_table *table;
730 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 731 struct net *net = sock_net(skb->sk);
96518518
PM		 732 int family = nfmsg->nfgen_family;
733
e688a7f8 734 rcu_read_lock();
38e029f1
PNA		 735 cb->seq = net->nft.base_seq;
736
36596dad 737 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 738 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 739 continue;
740
36596dad
PNA		 741 if (idx < s_idx)
742 goto cont;
743 if (idx > s_idx)
744 memset(&cb->args[1], 0,
745 sizeof(cb->args) - sizeof(cb->args[0]));
746 if (!nft_is_active(net, table))
747 continue;
748 if (nf_tables_fill_table_info(skb, net,
749 NETLINK_CB(cb->skb).portid,
750 cb->nlh->nlmsg_seq,
751 NFT_MSG_NEWTABLE, NLM_F_MULTI,
98319cb9 752 table->family, table) < 0)
36596dad
PNA		 753 goto done;
754
755 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 756cont:
36596dad 757 idx++;
96518518
PM		 758 }
759done:
e688a7f8 760 rcu_read_unlock();
96518518
PM		 761 cb->args[0] = idx;
762 return skb->len;
763}
764
d9adf22a
FW		 765static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
766 const struct nlmsghdr *nlh,
767 struct netlink_dump_control *c)
768{
769 int err;
770
771 if (!try_module_get(THIS_MODULE))
772 return -EINVAL;
773
774 rcu_read_unlock();
775 err = netlink_dump_start(nlsk, skb, nlh, c);
776 rcu_read_lock();
777 module_put(THIS_MODULE);
778
779 return err;
780}
781
782/* called with rcu_read_lock held */
7b8002a1
PNA		 783static int nf_tables_gettable(struct net *net, struct sock *nlsk,
784 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 785 const struct nlattr * const nla[],
786 struct netlink_ext_ack *extack)
96518518
PM		 787{
788 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 789 u8 genmask = nft_genmask_cur(net);
96518518
PM		 790 const struct nft_table *table;
791 struct sk_buff *skb2;
792 int family = nfmsg->nfgen_family;
793 int err;
794
795 if (nlh->nlmsg_flags & NLM_F_DUMP) {
796 struct netlink_dump_control c = {
797 .dump = nf_tables_dump_tables,
d9adf22a 798 .module = THIS_MODULE,
96518518 799 };
d9adf22a
FW		 800
801 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 802 }
803
cac20fcd 804 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
36dd1bcc
PNA		 805 if (IS_ERR(table)) {
806 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
96518518 807 return PTR_ERR(table);
36dd1bcc 808 }
96518518 809
d9adf22a 810 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 811 if (!skb2)
812 return -ENOMEM;
813
84d7fce6 814 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 815 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
816 family, table);
817 if (err < 0)
818 goto err;
819
820 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
821
822err:
823 kfree_skb(skb2);
824 return err;
825}
826
c9c17211 827static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
10435c11
F		 828{
829 struct nft_chain *chain;
830 u32 i = 0;
831
832 list_for_each_entry(chain, &table->chains, list) {
833 if (!nft_is_active_next(net, chain))
834 continue;
f323d954 835 if (!nft_is_base_chain(chain))
10435c11
F		 836 continue;
837
838 if (cnt && i++ == cnt)
839 break;
840
d54725cd
PNA		 841 nft_unregister_basechain_hooks(net, table->family,
842 nft_base_chain(chain));
10435c11
F		 843 }
844}
845
c9c17211 846static int nf_tables_table_enable(struct net *net, struct nft_table *table)
9ddf6323
PNA		 847{
848 struct nft_chain *chain;
849 int err, i = 0;
850
851 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 852 if (!nft_is_active_next(net, chain))
853 continue;
f323d954 854 if (!nft_is_base_chain(chain))
d2012975
PNA		 855 continue;
856
d54725cd
PNA		 857 err = nft_register_basechain_hooks(net, table->family,
858 nft_base_chain(chain));
9ddf6323 859 if (err < 0)
d54725cd 860 goto err_register_hooks;
9ddf6323
PNA		 861
862 i++;
863 }
864 return 0;
d54725cd
PNA		 865
866err_register_hooks:
10435c11 867 if (i)
c9c17211 868 nft_table_disable(net, table, i);
9ddf6323
PNA		 869 return err;
870}
871
c9c17211 872static void nf_tables_table_disable(struct net *net, struct nft_table *table)
9ddf6323 873{
c9c17211 874 nft_table_disable(net, table, 0);
9ddf6323
PNA		 875}
876
e1aaca93 877static int nf_tables_updtable(struct nft_ctx *ctx)
9ddf6323 878{
55dd6f93 879 struct nft_trans *trans;
e1aaca93 880 u32 flags;
55dd6f93 881 int ret = 0;
9ddf6323 882
e1aaca93
PNA		 883 if (!ctx->nla[NFTA_TABLE_FLAGS])
884 return 0;
9ddf6323 885
e1aaca93
PNA		 886 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
887 if (flags & ~NFT_TABLE_F_DORMANT)
888 return -EINVAL;
889
63283dd2
PNA		 890 if (flags == ctx->table->flags)
891 return 0;
892
55dd6f93
PNA		 893 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
894 sizeof(struct nft_trans_table));
895 if (trans == NULL)
896 return -ENOMEM;
9ddf6323 897
e1aaca93
PNA		 898 if ((flags & NFT_TABLE_F_DORMANT) &&
899 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
55dd6f93 900 nft_trans_table_enable(trans) = false;
e1aaca93
PNA		 901 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
902 ctx->table->flags & NFT_TABLE_F_DORMANT) {
c9c17211 903 ret = nf_tables_table_enable(ctx->net, ctx->table);
55dd6f93 904 if (ret >= 0) {
e1aaca93 905 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
55dd6f93 906 nft_trans_table_enable(trans) = true;
9ddf6323 907 }
9ddf6323 908 }
e1aaca93
PNA		 909 if (ret < 0)
910 goto err;
9ddf6323 911
55dd6f93
PNA		 912 nft_trans_table_update(trans) = true;
913 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
914 return 0;
9ddf6323 915err:
55dd6f93 916 nft_trans_destroy(trans);
9ddf6323
PNA		 917 return ret;
918}
919
1b2470e5
FW		 920static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
921{
922 const char *name = data;
923
924 return jhash(name, strlen(name), seed);
925}
926
927static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
928{
929 const struct nft_chain *chain = data;
930
931 return nft_chain_hash(chain->name, 0, seed);
932}
933
934static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
935 const void *ptr)
936{
937 const struct nft_chain *chain = ptr;
938 const char *name = arg->key;
939
940 return strcmp(chain->name, name);
941}
942
4d44175a
FW		 943static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
944{
945 const struct nft_object_hash_key *k = data;
946
947 seed ^= hash_ptr(k->table, 32);
948
949 return jhash(k->name, strlen(k->name), seed);
950}
951
952static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
953{
954 const struct nft_object *obj = data;
955
956 return nft_objname_hash(&obj->key, 0, seed);
957}
958
959static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
960 const void *ptr)
961{
962 const struct nft_object_hash_key *k = arg->key;
963 const struct nft_object *obj = ptr;
964
965 if (obj->key.table != k->table)
966 return -1;
967
968 return strcmp(obj->key.name, k->name);
969}
970
633c9a84
PNA		 971static int nf_tables_newtable(struct net *net, struct sock *nlsk,
972 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 973 const struct nlattr * const nla[],
974 struct netlink_ext_ack *extack)
96518518
PM		 975{
976 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 977 u8 genmask = nft_genmask_next(net);
96518518 978 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 979 const struct nlattr *attr;
980 struct nft_table *table;
c5c1f975 981 u32 flags = 0;
e1aaca93 982 struct nft_ctx ctx;
55dd6f93 983 int err;
96518518 984
f102d66b 985 lockdep_assert_held(&net->nft.commit_mutex);
36dd1bcc
PNA		 986 attr = nla[NFTA_TABLE_NAME];
987 table = nft_table_lookup(net, attr, family, genmask);
96518518
PM		 988 if (IS_ERR(table)) {
989 if (PTR_ERR(table) != -ENOENT)
990 return PTR_ERR(table);
1a28ad74 991 } else {
36dd1bcc
PNA		 992 if (nlh->nlmsg_flags & NLM_F_EXCL) {
993 NL_SET_BAD_ATTR(extack, attr);
96518518 994 return -EEXIST;
36dd1bcc 995 }
96518518
PM		 996 if (nlh->nlmsg_flags & NLM_F_REPLACE)
997 return -EOPNOTSUPP;
e1aaca93 998
98319cb9 999 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e1aaca93 1000 return nf_tables_updtable(&ctx);
96518518
PM		 1001 }
1002
c5c1f975
PM		 1003 if (nla[NFTA_TABLE_FLAGS]) {
1004 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1005 if (flags & ~NFT_TABLE_F_DORMANT)
1006 return -EINVAL;
1007 }
1008
ffdb210e 1009 err = -ENOMEM;
1cae565e 1010 table = kzalloc(sizeof(*table), GFP_KERNEL);
ffdb210e 1011 if (table == NULL)
98319cb9 1012 goto err_kzalloc;
96518518 1013
36dd1bcc 1014 table->name = nla_strdup(attr, GFP_KERNEL);
e46abbcc 1015 if (table->name == NULL)
98319cb9 1016 goto err_strdup;
e46abbcc 1017
1b2470e5
FW		 1018 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1019 if (err)
1020 goto err_chain_ht;
1021
96518518 1022 INIT_LIST_HEAD(&table->chains);
20a69341 1023 INIT_LIST_HEAD(&table->sets);
e5009240 1024 INIT_LIST_HEAD(&table->objects);
3b49e2e9 1025 INIT_LIST_HEAD(&table->flowtables);
98319cb9 1026 table->family = family;
c5c1f975 1027 table->flags = flags;
3ecbfd65 1028 table->handle = ++table_handle;
9ddf6323 1029
98319cb9 1030 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
55dd6f93 1031 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
ffdb210e 1032 if (err < 0)
98319cb9 1033 goto err_trans;
ffdb210e 1034
36596dad 1035 list_add_tail_rcu(&table->list, &net->nft.tables);
96518518 1036 return 0;
98319cb9 1037err_trans:
1b2470e5
FW		 1038 rhltable_destroy(&table->chains_ht);
1039err_chain_ht:
e46abbcc 1040 kfree(table->name);
98319cb9 1041err_strdup:
ffdb210e 1042 kfree(table);
98319cb9 1043err_kzalloc:
ffdb210e 1044 return err;
96518518
PM		 1045}
1046
b9ac12ef
AB		 1047static int nft_flush_table(struct nft_ctx *ctx)
1048{
3b49e2e9 1049 struct nft_flowtable *flowtable, *nft;
b9ac12ef 1050 struct nft_chain *chain, *nc;
e5009240 1051 struct nft_object *obj, *ne;
b9ac12ef 1052 struct nft_set *set, *ns;
3b49e2e9 1053 int err;
b9ac12ef 1054
a2f18db0 1055 list_for_each_entry(chain, &ctx->table->chains, list) {
664b0f8c
PNA		 1056 if (!nft_is_active_next(ctx->net, chain))
1057 continue;
1058
b9ac12ef
AB		 1059 ctx->chain = chain;
1060
1061 err = nft_delrule_by_chain(ctx);
1062 if (err < 0)
1063 goto out;
b9ac12ef
AB		 1064 }
1065
1066 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
37a9cc52
PNA		 1067 if (!nft_is_active_next(ctx->net, set))
1068 continue;
1069
408070d6 1070 if (nft_set_is_anonymous(set) &&
b9ac12ef
AB		 1071 !list_empty(&set->bindings))
1072 continue;
1073
1074 err = nft_delset(ctx, set);
1075 if (err < 0)
1076 goto out;
1077 }
1078
3b49e2e9 1079 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
335178d5
FW		 1080 if (!nft_is_active_next(ctx->net, flowtable))
1081 continue;
1082
3b49e2e9
PNA		 1083 err = nft_delflowtable(ctx, flowtable);
1084 if (err < 0)
1085 goto out;
1086 }
1087
e5009240 1088 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
335178d5
FW		 1089 if (!nft_is_active_next(ctx->net, obj))
1090 continue;
1091
e5009240
PNA		 1092 err = nft_delobj(ctx, obj);
1093 if (err < 0)
1094 goto out;
1095 }
1096
a2f18db0 1097 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
664b0f8c
PNA		 1098 if (!nft_is_active_next(ctx->net, chain))
1099 continue;
1100
a2f18db0
PNA		 1101 ctx->chain = chain;
1102
1103 err = nft_delchain(ctx);
1104 if (err < 0)
1105 goto out;
1106 }
1107
b9ac12ef
AB		 1108 err = nft_deltable(ctx);
1109out:
1110 return err;
1111}
1112
1113static int nft_flush(struct nft_ctx *ctx, int family)
1114{
b9ac12ef
AB		 1115 struct nft_table *table, *nt;
1116 const struct nlattr * const *nla = ctx->nla;
1117 int err = 0;
1118
36596dad 1119 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
98319cb9 1120 if (family != AF_UNSPEC && table->family != family)
b9ac12ef
AB		 1121 continue;
1122
98319cb9 1123 ctx->family = table->family;
f2a6d766 1124
36596dad
PNA		 1125 if (!nft_is_active_next(ctx->net, table))
1126 continue;
b9ac12ef 1127
36596dad
PNA		 1128 if (nla[NFTA_TABLE_NAME] &&
1129 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1130 continue;
b9ac12ef 1131
36596dad
PNA		 1132 ctx->table = table;
1133
1134 err = nft_flush_table(ctx);
1135 if (err < 0)
1136 goto out;
b9ac12ef
AB		 1137 }
1138out:
1139 return err;
1140}
1141
633c9a84
PNA		 1142static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1143 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1144 const struct nlattr * const nla[],
1145 struct netlink_ext_ack *extack)
96518518
PM		 1146{
1147 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1148 u8 genmask = nft_genmask_next(net);
ee01d542 1149 int family = nfmsg->nfgen_family;
36dd1bcc
PNA		 1150 const struct nlattr *attr;
1151 struct nft_table *table;
55dd6f93 1152 struct nft_ctx ctx;
96518518 1153
36596dad 1154 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
3ecbfd65
HS		 1155 if (family == AF_UNSPEC ||
1156 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
b9ac12ef
AB		 1157 return nft_flush(&ctx, family);
1158
36dd1bcc
PNA		 1159 if (nla[NFTA_TABLE_HANDLE]) {
1160 attr = nla[NFTA_TABLE_HANDLE];
1161 table = nft_table_lookup_byhandle(net, attr, genmask);
1162 } else {
1163 attr = nla[NFTA_TABLE_NAME];
1164 table = nft_table_lookup(net, attr, family, genmask);
1165 }
3ecbfd65 1166
36dd1bcc
PNA		 1167 if (IS_ERR(table)) {
1168 NL_SET_BAD_ATTR(extack, attr);
96518518 1169 return PTR_ERR(table);
36dd1bcc 1170 }
96518518 1171
a8278400
PNA		 1172 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1173 table->use > 0)
1174 return -EBUSY;
1175
98319cb9 1176 ctx.family = family;
b9ac12ef 1177 ctx.table = table;
55dd6f93 1178
b9ac12ef 1179 return nft_flush_table(&ctx);
96518518
PM		 1180}
1181
55dd6f93
PNA		 1182static void nf_tables_table_destroy(struct nft_ctx *ctx)
1183{
fa5950e4
FW		 1184 if (WARN_ON(ctx->table->use > 0))
1185 return;
4fefee57 1186
1b2470e5 1187 rhltable_destroy(&ctx->table->chains_ht);
e46abbcc 1188 kfree(ctx->table->name);
55dd6f93 1189 kfree(ctx->table);
55dd6f93
PNA		 1190}
1191
cc07eeb0 1192void nft_register_chain_type(const struct nft_chain_type *ctype)
96518518 1193{
96518518 1194 nfnl_lock(NFNL_SUBSYS_NFTABLES);
82603549 1195 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
cc07eeb0
PNA		 1196 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1197 return;
96518518 1198 }
9370761c 1199 chain_type[ctype->family][ctype->type] = ctype;
96518518 1200 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
96518518 1201}
9370761c 1202EXPORT_SYMBOL_GPL(nft_register_chain_type);
96518518 1203
32537e91 1204void nft_unregister_chain_type(const struct nft_chain_type *ctype)
96518518 1205{
96518518 1206 nfnl_lock(NFNL_SUBSYS_NFTABLES);
9370761c 1207 chain_type[ctype->family][ctype->type] = NULL;
96518518
PM		 1208 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1209}
9370761c 1210EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
96518518
PM		 1211
1212/*
1213 * Chains
1214 */
1215
1216static struct nft_chain *
cac20fcd 1217nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
96518518
PM		 1218{
1219 struct nft_chain *chain;
1220
1221 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 1222 if (chain->handle == handle &&
1223 nft_active_genmask(chain, genmask))
96518518
PM		 1224 return chain;
1225 }
1226
1227 return ERR_PTR(-ENOENT);
1228}
1229
4d44175a 1230static bool lockdep_commit_lock_is_held(const struct net *net)
f102d66b
FW		 1231{
1232#ifdef CONFIG_PROVE_LOCKING
1233 return lockdep_is_held(&net->nft.commit_mutex);
1234#else
1235 return true;
1236#endif
1237}
1238
1239static struct nft_chain *nft_chain_lookup(struct net *net,
1240 struct nft_table *table,
cac20fcd 1241 const struct nlattr *nla, u8 genmask)
96518518 1242{
1b2470e5
FW		 1243 char search[NFT_CHAIN_MAXNAMELEN + 1];
1244 struct rhlist_head *tmp, *list;
96518518
PM		 1245 struct nft_chain *chain;
1246
1247 if (nla == NULL)
1248 return ERR_PTR(-EINVAL);
1249
1b2470e5 1250 nla_strlcpy(search, nla, sizeof(search));
96518518 1251
1b2470e5 1252 WARN_ON(!rcu_read_lock_held() &&
f102d66b 1253 !lockdep_commit_lock_is_held(net));
1b2470e5
FW		 1254
1255 chain = ERR_PTR(-ENOENT);
1256 rcu_read_lock();
1257 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1258 if (!list)
1259 goto out_unlock;
1260
1261 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1262 if (nft_active_genmask(chain, genmask))
1263 goto out_unlock;
1264 }
1265 chain = ERR_PTR(-ENOENT);
1266out_unlock:
1267 rcu_read_unlock();
1268 return chain;
96518518
PM		 1269}
1270
1271static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
b2fbd044
LZ		 1272 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1273 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 1274 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1275 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1276 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1277 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
0ca743a5 1278 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
9332d27d
FW		 1279 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1280 .len = NFT_MODULE_AUTOLOAD_LIMIT },
0ca743a5 1281 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
c9626a2c 1282 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
74cccc3d 1283 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
96518518
PM		 1284};
1285
1286static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1287 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1288 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
2cbce139
PNA		 1289 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1290 .len = IFNAMSIZ - 1 },
96518518
PM		 1291};
1292
0ca743a5
PNA		 1293static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1294{
1295 struct nft_stats *cpu_stats, total;
1296 struct nlattr *nest;
ce355e20
ED		 1297 unsigned int seq;
1298 u64 pkts, bytes;
0ca743a5
PNA		 1299 int cpu;
1300
edbd82c5
FW		 1301 if (!stats)
1302 return 0;
1303
0ca743a5
PNA		 1304 memset(&total, 0, sizeof(total));
1305 for_each_possible_cpu(cpu) {
1306 cpu_stats = per_cpu_ptr(stats, cpu);
ce355e20
ED		 1307 do {
1308 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1309 pkts = cpu_stats->pkts;
1310 bytes = cpu_stats->bytes;
1311 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1312 total.pkts += pkts;
1313 total.bytes += bytes;
0ca743a5 1314 }
ae0be8de 1315 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
0ca743a5
PNA		 1316 if (nest == NULL)
1317 goto nla_put_failure;
1318
b46f6ded
ND		 1319 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1320 NFTA_COUNTER_PAD) ||
1321 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1322 NFTA_COUNTER_PAD))
0ca743a5
PNA		 1323 goto nla_put_failure;
1324
1325 nla_nest_end(skb, nest);
1326 return 0;
1327
1328nla_put_failure:
1329 return -ENOSPC;
1330}
1331
d54725cd
PNA		 1332static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1333 const struct nft_base_chain *basechain)
1334{
1335 const struct nf_hook_ops *ops = &basechain->ops;
1336 struct nft_hook *hook, *first = NULL;
1337 struct nlattr *nest, *nest_devs;
1338 int n = 0;
1339
1340 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1341 if (nest == NULL)
1342 goto nla_put_failure;
1343 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1344 goto nla_put_failure;
1345 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1346 goto nla_put_failure;
1347
1348 if (family == NFPROTO_NETDEV) {
1349 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1350 list_for_each_entry(hook, &basechain->hook_list, list) {
1351 if (!first)
1352 first = hook;
1353
1354 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1355 hook->ops.dev->name))
1356 goto nla_put_failure;
1357 n++;
1358 }
1359 nla_nest_end(skb, nest_devs);
1360
1361 if (n == 1 &&
1362 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1363 goto nla_put_failure;
1364 }
1365 nla_nest_end(skb, nest);
1366
1367 return 0;
1368nla_put_failure:
1369 return -1;
1370}
1371
84d7fce6
PNA		 1372static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1373 u32 portid, u32 seq, int event, u32 flags,
1374 int family, const struct nft_table *table,
96518518
PM		 1375 const struct nft_chain *chain)
1376{
1377 struct nlmsghdr *nlh;
1378 struct nfgenmsg *nfmsg;
1379
dedb67c4 1380 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518
PM		 1381 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1382 if (nlh == NULL)
1383 goto nla_put_failure;
1384
1385 nfmsg = nlmsg_data(nlh);
1386 nfmsg->nfgen_family = family;
1387 nfmsg->version = NFNETLINK_V0;
84d7fce6 1388 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 1389
1390 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1391 goto nla_put_failure;
b46f6ded
ND		 1392 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1393 NFTA_CHAIN_PAD))
96518518
PM		 1394 goto nla_put_failure;
1395 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1396 goto nla_put_failure;
1397
f323d954 1398 if (nft_is_base_chain(chain)) {
0ca743a5 1399 const struct nft_base_chain *basechain = nft_base_chain(chain);
edbd82c5 1400 struct nft_stats __percpu *stats;
0ca743a5 1401
d54725cd 1402 if (nft_dump_basechain_hook(skb, family, basechain))
2cbce139 1403 goto nla_put_failure;
9370761c 1404
0ca743a5
PNA		 1405 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1406 htonl(basechain->policy)))
1407 goto nla_put_failure;
1408
baae3e62
PM		 1409 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1410 goto nla_put_failure;
0ca743a5 1411
edbd82c5
FW		 1412 stats = rcu_dereference_check(basechain->stats,
1413 lockdep_commit_lock_is_held(net));
1414 if (nft_dump_stats(skb, stats))
0ca743a5 1415 goto nla_put_failure;
d78008de
PNA		 1416
1417 if ((chain->flags & NFT_CHAIN_HW_OFFLOAD) &&
1418 nla_put_be32(skb, NFTA_CHAIN_FLAGS,
1419 htonl(NFT_CHAIN_HW_OFFLOAD)))
1420 goto nla_put_failure;
96518518
PM		 1421 }
1422
0ca743a5
PNA		 1423 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1424 goto nla_put_failure;
1425
053c095a
JB		 1426 nlmsg_end(skb, nlh);
1427 return 0;
96518518
PM		 1428
1429nla_put_failure:
1430 nlmsg_trim(skb, nlh);
1431 return -1;
1432}
1433
25e94a99 1434static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
96518518
PM		 1435{
1436 struct sk_buff *skb;
96518518
PM		 1437 int err;
1438
128ad332
PNA		 1439 if (!ctx->report &&
1440 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 1441 return;
96518518 1442
96518518
PM		 1443 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1444 if (skb == NULL)
1445 goto err;
1446
84d7fce6 1447 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 1448 event, 0, ctx->family, ctx->table,
35151d84 1449 ctx->chain);
96518518
PM		 1450 if (err < 0) {
1451 kfree_skb(skb);
1452 goto err;
1453 }
1454
25e94a99
PNA		 1455 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1456 ctx->report, GFP_KERNEL);
1457 return;
96518518 1458err:
25e94a99 1459 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 1460}
1461
1462static int nf_tables_dump_chains(struct sk_buff *skb,
1463 struct netlink_callback *cb)
1464{
1465 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
96518518
PM		 1466 const struct nft_table *table;
1467 const struct nft_chain *chain;
1468 unsigned int idx = 0, s_idx = cb->args[0];
99633ab2 1469 struct net *net = sock_net(skb->sk);
96518518
PM		 1470 int family = nfmsg->nfgen_family;
1471
e688a7f8 1472 rcu_read_lock();
38e029f1
PNA		 1473 cb->seq = net->nft.base_seq;
1474
36596dad 1475 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 1476 if (family != NFPROTO_UNSPEC && family != table->family)
96518518
PM		 1477 continue;
1478
36596dad
PNA		 1479 list_for_each_entry_rcu(chain, &table->chains, list) {
1480 if (idx < s_idx)
1481 goto cont;
1482 if (idx > s_idx)
1483 memset(&cb->args[1], 0,
1484 sizeof(cb->args) - sizeof(cb->args[0]));
1485 if (!nft_is_active(net, chain))
1486 continue;
1487 if (nf_tables_fill_chain_info(skb, net,
1488 NETLINK_CB(cb->skb).portid,
1489 cb->nlh->nlmsg_seq,
1490 NFT_MSG_NEWCHAIN,
1491 NLM_F_MULTI,
98319cb9 1492 table->family, table,
36596dad
PNA		 1493 chain) < 0)
1494 goto done;
38e029f1 1495
36596dad 1496 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
96518518 1497cont:
36596dad 1498 idx++;
96518518
PM		 1499 }
1500 }
1501done:
e688a7f8 1502 rcu_read_unlock();
96518518
PM		 1503 cb->args[0] = idx;
1504 return skb->len;
1505}
1506
d9adf22a 1507/* called with rcu_read_lock held */
7b8002a1
PNA		 1508static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1509 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 1510 const struct nlattr * const nla[],
1511 struct netlink_ext_ack *extack)
96518518
PM		 1512{
1513 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 1514 u8 genmask = nft_genmask_cur(net);
96518518 1515 const struct nft_chain *chain;
1b2470e5 1516 struct nft_table *table;
96518518
PM		 1517 struct sk_buff *skb2;
1518 int family = nfmsg->nfgen_family;
1519 int err;
1520
1521 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1522 struct netlink_dump_control c = {
1523 .dump = nf_tables_dump_chains,
d9adf22a 1524 .module = THIS_MODULE,
96518518 1525 };
d9adf22a
FW		 1526
1527 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 1528 }
1529
cac20fcd 1530 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 1531 if (IS_ERR(table)) {
1532 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 1533 return PTR_ERR(table);
36dd1bcc 1534 }
96518518 1535
f102d66b 1536 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
36dd1bcc
PNA		 1537 if (IS_ERR(chain)) {
1538 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
96518518 1539 return PTR_ERR(chain);
36dd1bcc 1540 }
96518518 1541
d9adf22a 1542 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 1543 if (!skb2)
1544 return -ENOMEM;
1545
84d7fce6 1546 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
96518518
PM		 1547 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1548 family, table, chain);
1549 if (err < 0)
1550 goto err;
1551
1552 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1553
1554err:
1555 kfree_skb(skb2);
1556 return err;
1557}
1558
0ca743a5
PNA		 1559static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1560 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1561 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1562};
1563
ff3cd7b3 1564static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
0ca743a5
PNA		 1565{
1566 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1567 struct nft_stats __percpu *newstats;
1568 struct nft_stats *stats;
1569 int err;
1570
8cb08174
JB		 1571 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1572 nft_counter_policy, NULL);
0ca743a5 1573 if (err < 0)
ff3cd7b3 1574 return ERR_PTR(err);
0ca743a5
PNA		 1575
1576 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
ff3cd7b3 1577 return ERR_PTR(-EINVAL);
0ca743a5 1578
ce355e20 1579 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
0ca743a5 1580 if (newstats == NULL)
ff3cd7b3 1581 return ERR_PTR(-ENOMEM);
0ca743a5
PNA		 1582
1583 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1584 * are not exposed to userspace.
1585 */
e8781f70 1586 preempt_disable();
0ca743a5
PNA		 1587 stats = this_cpu_ptr(newstats);
1588 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1589 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
e8781f70 1590 preempt_enable();
0ca743a5 1591
ff3cd7b3
PNA		 1592 return newstats;
1593}
1594
53315ac6 1595static void nft_chain_stats_replace(struct nft_trans *trans)
ff3cd7b3 1596{
53315ac6 1597 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
0befd061 1598
53315ac6 1599 if (!nft_trans_chain_stats(trans))
b88825de
PNA		 1600 return;
1601
b685b534
PM		 1602 nft_trans_chain_stats(trans) =
1603 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1604 lockdep_commit_lock_is_held(trans->ctx.net));
53315ac6
FW		 1605
1606 if (!nft_trans_chain_stats(trans))
bbb8c61f 1607 static_branch_inc(&nft_counters_enabled);
0ca743a5
PNA		 1608}
1609
0cbc06b3
FW		 1610static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1611{
1612 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1613 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1614
1615 if (g0 != g1)
1616 kvfree(g1);
1617 kvfree(g0);
1618
1619 /* should be NULL either via abort or via successful commit */
1620 WARN_ON_ONCE(chain->rules_next);
1621 kvfree(chain->rules_next);
1622}
1623
43a605f2 1624static void nf_tables_chain_destroy(struct nft_ctx *ctx)
91c7b38d 1625{
43a605f2 1626 struct nft_chain *chain = ctx->chain;
d54725cd 1627 struct nft_hook *hook, *next;
43a605f2 1628
fa5950e4
FW		 1629 if (WARN_ON(chain->use > 0))
1630 return;
91c7b38d 1631
0cbc06b3
FW		 1632 /* no concurrent access possible anymore */
1633 nf_tables_chain_free_chain_rules(chain);
1634
f323d954 1635 if (nft_is_base_chain(chain)) {
2cbce139
PNA		 1636 struct nft_base_chain *basechain = nft_base_chain(chain);
1637
d54725cd
PNA		 1638 if (ctx->family == NFPROTO_NETDEV) {
1639 list_for_each_entry_safe(hook, next,
1640 &basechain->hook_list, list) {
1641 list_del_rcu(&hook->list);
1642 kfree_rcu(hook, rcu);
1643 }
1644 }
2cbce139 1645 module_put(basechain->type->owner);
4c05ec47 1646 if (rcu_access_pointer(basechain->stats)) {
9f08ea84 1647 static_branch_dec(&nft_counters_enabled);
4c05ec47
TY		 1648 free_percpu(rcu_dereference_raw(basechain->stats));
1649 }
b7263e07 1650 kfree(chain->name);
2cbce139 1651 kfree(basechain);
91c7b38d 1652 } else {
b7263e07 1653 kfree(chain->name);
91c7b38d
PNA		 1654 kfree(chain);
1655 }
1656}
1657
3f0465a9
PNA		 1658static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1659 const struct nlattr *attr)
1660{
1661 struct net_device *dev;
1662 char ifname[IFNAMSIZ];
1663 struct nft_hook *hook;
1664 int err;
1665
1666 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1667 if (!hook) {
1668 err = -ENOMEM;
1669 goto err_hook_alloc;
1670 }
1671
1672 nla_strlcpy(ifname, attr, IFNAMSIZ);
1673 dev = __dev_get_by_name(net, ifname);
1674 if (!dev) {
1675 err = -ENOENT;
1676 goto err_hook_dev;
1677 }
1678 hook->ops.dev = dev;
abadb2f8 1679 hook->inactive = false;
3f0465a9
PNA		 1680
1681 return hook;
1682
1683err_hook_dev:
1684 kfree(hook);
1685err_hook_alloc:
1686 return ERR_PTR(err);
1687}
1688
abadb2f8
PNA		 1689static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1690 const struct nft_hook *this)
b75a3e83
PNA		 1691{
1692 struct nft_hook *hook;
1693
1694 list_for_each_entry(hook, hook_list, list) {
1695 if (this->ops.dev == hook->ops.dev)
abadb2f8 1696 return hook;
b75a3e83
PNA		 1697 }
1698
abadb2f8 1699 return NULL;
b75a3e83
PNA		 1700}
1701
3f0465a9
PNA		 1702static int nf_tables_parse_netdev_hooks(struct net *net,
1703 const struct nlattr *attr,
1704 struct list_head *hook_list)
1705{
1706 struct nft_hook *hook, *next;
1707 const struct nlattr *tmp;
1708 int rem, n = 0, err;
1709
1710 nla_for_each_nested(tmp, attr, rem) {
1711 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1712 err = -EINVAL;
1713 goto err_hook;
1714 }
1715
1716 hook = nft_netdev_hook_alloc(net, tmp);
1717 if (IS_ERR(hook)) {
1718 err = PTR_ERR(hook);
1719 goto err_hook;
1720 }
b75a3e83 1721 if (nft_hook_list_find(hook_list, hook)) {
cd77e75b 1722 kfree(hook);
b75a3e83
PNA		 1723 err = -EEXIST;
1724 goto err_hook;
1725 }
3f0465a9
PNA		 1726 list_add_tail(&hook->list, hook_list);
1727 n++;
1728
cb662ac6 1729 if (n == NFT_NETDEVICE_MAX) {
3f0465a9
PNA		 1730 err = -EFBIG;
1731 goto err_hook;
1732 }
1733 }
3f0465a9
PNA		 1734
1735 return 0;
1736
1737err_hook:
1738 list_for_each_entry_safe(hook, next, hook_list, list) {
1739 list_del(&hook->list);
1740 kfree(hook);
1741 }
1742 return err;
1743}
1744
508f8ccd
PNA		 1745struct nft_chain_hook {
1746 u32 num;
84ba7dd7 1747 s32 priority;
32537e91 1748 const struct nft_chain_type *type;
d54725cd 1749 struct list_head list;
508f8ccd
PNA		 1750};
1751
d54725cd
PNA		 1752static int nft_chain_parse_netdev(struct net *net,
1753 struct nlattr *tb[],
1754 struct list_head *hook_list)
1755{
1756 struct nft_hook *hook;
1757 int err;
1758
1759 if (tb[NFTA_HOOK_DEV]) {
1760 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1761 if (IS_ERR(hook))
1762 return PTR_ERR(hook);
1763
1764 list_add_tail(&hook->list, hook_list);
1765 } else if (tb[NFTA_HOOK_DEVS]) {
1766 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1767 hook_list);
1768 if (err < 0)
1769 return err;
05abe445
PNA		 1770
1771 if (list_empty(hook_list))
1772 return -EINVAL;
d54725cd
PNA		 1773 } else {
1774 return -EINVAL;
1775 }
1776
1777 return 0;
1778}
1779
508f8ccd
PNA		 1780static int nft_chain_parse_hook(struct net *net,
1781 const struct nlattr * const nla[],
36596dad 1782 struct nft_chain_hook *hook, u8 family,
445509eb 1783 bool autoload)
508f8ccd
PNA		 1784{
1785 struct nlattr *ha[NFTA_HOOK_MAX + 1];
32537e91 1786 const struct nft_chain_type *type;
508f8ccd
PNA		 1787 int err;
1788
f102d66b
FW		 1789 lockdep_assert_held(&net->nft.commit_mutex);
1790 lockdep_nfnl_nft_mutex_not_held();
1791
8cb08174
JB		 1792 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1793 nla[NFTA_CHAIN_HOOK],
1794 nft_hook_policy, NULL);
508f8ccd
PNA		 1795 if (err < 0)
1796 return err;
1797
1798 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1799 ha[NFTA_HOOK_PRIORITY] == NULL)
1800 return -EINVAL;
1801
1802 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
508f8ccd
PNA		 1803 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1804
82603549
PNA		 1805 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1806 if (!type)
1807 return -EOPNOTSUPP;
1808
508f8ccd 1809 if (nla[NFTA_CHAIN_TYPE]) {
452238e8 1810 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
445509eb 1811 family, autoload);
508f8ccd
PNA		 1812 if (IS_ERR(type))
1813 return PTR_ERR(type);
1814 }
33d1c018 1815 if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
508f8ccd 1816 return -EOPNOTSUPP;
84ba7dd7
FW		 1817
1818 if (type->type == NFT_CHAIN_T_NAT &&
1819 hook->priority <= NF_IP_PRI_CONNTRACK)
1820 return -EOPNOTSUPP;
1821
508f8ccd
PNA		 1822 if (!try_module_get(type->owner))
1823 return -ENOENT;
1824
1825 hook->type = type;
1826
d54725cd 1827 INIT_LIST_HEAD(&hook->list);
36596dad 1828 if (family == NFPROTO_NETDEV) {
d54725cd
PNA		 1829 err = nft_chain_parse_netdev(net, ha, &hook->list);
1830 if (err < 0) {
508f8ccd 1831 module_put(type->owner);
d54725cd 1832 return err;
508f8ccd 1833 }
d54725cd 1834 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
508f8ccd
PNA		 1835 module_put(type->owner);
1836 return -EOPNOTSUPP;
1837 }
1838
1839 return 0;
1840}
1841
1842static void nft_chain_release_hook(struct nft_chain_hook *hook)
1843{
d54725cd
PNA		 1844 struct nft_hook *h, *next;
1845
1846 list_for_each_entry_safe(h, next, &hook->list, list) {
1847 list_del(&h->list);
1848 kfree(h);
1849 }
508f8ccd 1850 module_put(hook->type->owner);
508f8ccd
PNA		 1851}
1852
0cbc06b3
FW		 1853struct nft_rules_old {
1854 struct rcu_head h;
1855 struct nft_rule **start;
1856};
1857
1858static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1859 unsigned int alloc)
1860{
1861 if (alloc > INT_MAX)
1862 return NULL;
1863
1864 alloc += 1; /* NULL, ends rules */
1865 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1866 return NULL;
1867
1868 alloc *= sizeof(struct nft_rule *);
1869 alloc += sizeof(struct nft_rules_old);
1870
1871 return kvmalloc(alloc, GFP_KERNEL);
1872}
1873
d54725cd
PNA		 1874static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1875 const struct nft_chain_hook *hook,
1876 struct nft_chain *chain)
1877{
1878 ops->pf = family;
1879 ops->hooknum = hook->num;
1880 ops->priority = hook->priority;
1881 ops->priv = chain;
1882 ops->hook = hook->type->hooks[ops->hooknum];
1883}
1884
1885static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1886 struct nft_chain_hook *hook, u32 flags)
1887{
1888 struct nft_chain *chain;
1889 struct nft_hook *h;
1890
1891 basechain->type = hook->type;
1892 INIT_LIST_HEAD(&basechain->hook_list);
1893 chain = &basechain->chain;
1894
1895 if (family == NFPROTO_NETDEV) {
1896 list_splice_init(&hook->list, &basechain->hook_list);
1897 list_for_each_entry(h, &basechain->hook_list, list)
1898 nft_basechain_hook_init(&h->ops, family, hook, chain);
1899
1900 basechain->ops.hooknum = hook->num;
1901 basechain->ops.priority = hook->priority;
1902 } else {
1903 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1904 }
1905
1906 chain->flags |= NFT_BASE_CHAIN | flags;
1907 basechain->policy = NF_ACCEPT;
1908 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1909 nft_chain_offload_priority(basechain) < 0)
1910 return -EOPNOTSUPP;
1911
1912 flow_block_init(&basechain->flow_block);
1913
1914 return 0;
1915}
1916
4035285f 1917static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
c9626a2c 1918 u8 policy, u32 flags)
4035285f
PNA		 1919{
1920 const struct nlattr * const *nla = ctx->nla;
1921 struct nft_table *table = ctx->table;
4035285f
PNA		 1922 struct nft_base_chain *basechain;
1923 struct nft_stats __percpu *stats;
1924 struct net *net = ctx->net;
66293c46 1925 struct nft_trans *trans;
4035285f 1926 struct nft_chain *chain;
0cbc06b3 1927 struct nft_rule **rules;
4035285f
PNA		 1928 int err;
1929
1930 if (table->use == UINT_MAX)
1931 return -EOVERFLOW;
1932
1933 if (nla[NFTA_CHAIN_HOOK]) {
1934 struct nft_chain_hook hook;
4035285f 1935
445509eb 1936 err = nft_chain_parse_hook(net, nla, &hook, family, true);
4035285f
PNA		 1937 if (err < 0)
1938 return err;
1939
1940 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1941 if (basechain == NULL) {
1942 nft_chain_release_hook(&hook);
1943 return -ENOMEM;
1944 }
d54725cd 1945 chain = &basechain->chain;
4035285f
PNA		 1946
1947 if (nla[NFTA_CHAIN_COUNTERS]) {
1948 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1949 if (IS_ERR(stats)) {
1950 nft_chain_release_hook(&hook);
1951 kfree(basechain);
1952 return PTR_ERR(stats);
1953 }
4c05ec47 1954 rcu_assign_pointer(basechain->stats, stats);
4035285f
PNA		 1955 static_branch_inc(&nft_counters_enabled);
1956 }
1957
d54725cd
PNA		 1958 err = nft_basechain_init(basechain, family, &hook, flags);
1959 if (err < 0) {
1960 nft_chain_release_hook(&hook);
1961 kfree(basechain);
1962 return err;
1963 }
4035285f
PNA		 1964 } else {
1965 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1966 if (chain == NULL)
1967 return -ENOMEM;
1968 }
43a605f2
PNA		 1969 ctx->chain = chain;
1970
4035285f
PNA		 1971 INIT_LIST_HEAD(&chain->rules);
1972 chain->handle = nf_tables_alloc_handle(table);
1973 chain->table = table;
1974 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1975 if (!chain->name) {
1976 err = -ENOMEM;
1977 goto err1;
1978 }
1979
0cbc06b3
FW		 1980 rules = nf_tables_chain_alloc_rules(chain, 0);
1981 if (!rules) {
1982 err = -ENOMEM;
1983 goto err1;
1984 }
1985
1986 *rules = NULL;
1987 rcu_assign_pointer(chain->rules_gen_0, rules);
1988 rcu_assign_pointer(chain->rules_gen_1, rules);
1989
c974a3a3 1990 err = nf_tables_register_hook(net, table, chain);
4035285f
PNA		 1991 if (err < 0)
1992 goto err1;
1993
1b2470e5
FW		 1994 err = rhltable_insert_key(&table->chains_ht, chain->name,
1995 &chain->rhlhead, nft_chain_ht_params);
1996 if (err)
1997 goto err2;
1998
66293c46
FW		 1999 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2000 if (IS_ERR(trans)) {
2001 err = PTR_ERR(trans);
1b2470e5
FW		 2002 rhltable_remove(&table->chains_ht, &chain->rhlhead,
2003 nft_chain_ht_params);
4035285f 2004 goto err2;
1b2470e5 2005 }
4035285f 2006
ad652f38 2007 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
66293c46
FW		 2008 if (nft_is_base_chain(chain))
2009 nft_trans_chain_policy(trans) = policy;
2010
4035285f
PNA		 2011 table->use++;
2012 list_add_tail_rcu(&chain->list, &table->chains);
2013
2014 return 0;
2015err2:
c974a3a3 2016 nf_tables_unregister_hook(net, table, chain);
4035285f 2017err1:
43a605f2 2018 nf_tables_chain_destroy(ctx);
4035285f
PNA		 2019
2020 return err;
2021}
2022
d54725cd
PNA		 2023static bool nft_hook_list_equal(struct list_head *hook_list1,
2024 struct list_head *hook_list2)
2025{
2026 struct nft_hook *hook;
2027 int n = 0, m = 0;
2028
2029 n = 0;
2030 list_for_each_entry(hook, hook_list2, list) {
2031 if (!nft_hook_list_find(hook_list1, hook))
2032 return false;
2033
2034 n++;
2035 }
2036 list_for_each_entry(hook, hook_list1, list)
2037 m++;
2038
2039 return n == m;
2040}
2041
c9626a2c
PNA		 2042static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2043 u32 flags)
2c4a488a
PNA		 2044{
2045 const struct nlattr * const *nla = ctx->nla;
2046 struct nft_table *table = ctx->table;
2047 struct nft_chain *chain = ctx->chain;
2c4a488a
PNA		 2048 struct nft_base_chain *basechain;
2049 struct nft_stats *stats = NULL;
2050 struct nft_chain_hook hook;
2c4a488a
PNA		 2051 struct nf_hook_ops *ops;
2052 struct nft_trans *trans;
c974a3a3 2053 int err;
2c4a488a 2054
c9626a2c
PNA		 2055 if (chain->flags ^ flags)
2056 return -EOPNOTSUPP;
2057
2c4a488a
PNA		 2058 if (nla[NFTA_CHAIN_HOOK]) {
2059 if (!nft_is_base_chain(chain))
2060 return -EBUSY;
2061
36596dad 2062 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
445509eb 2063 false);
2c4a488a
PNA		 2064 if (err < 0)
2065 return err;
2066
2067 basechain = nft_base_chain(chain);
2068 if (basechain->type != hook.type) {
2069 nft_chain_release_hook(&hook);
2070 return -EBUSY;
2071 }
2072
d54725cd
PNA		 2073 if (ctx->family == NFPROTO_NETDEV) {
2074 if (!nft_hook_list_equal(&basechain->hook_list,
2075 &hook.list)) {
2076 nft_chain_release_hook(&hook);
2077 return -EBUSY;
2078 }
2079 } else {
2080 ops = &basechain->ops;
2081 if (ops->hooknum != hook.num ||
2082 ops->priority != hook.priority) {
2083 nft_chain_release_hook(&hook);
2084 return -EBUSY;
2085 }
2c4a488a
PNA		 2086 }
2087 nft_chain_release_hook(&hook);
2088 }
2089
2090 if (nla[NFTA_CHAIN_HANDLE] &&
2091 nla[NFTA_CHAIN_NAME]) {
2092 struct nft_chain *chain2;
2093
f102d66b
FW		 2094 chain2 = nft_chain_lookup(ctx->net, table,
2095 nla[NFTA_CHAIN_NAME], genmask);
0d18779b
JC		 2096 if (!IS_ERR(chain2))
2097 return -EEXIST;
2c4a488a
PNA		 2098 }
2099
2100 if (nla[NFTA_CHAIN_COUNTERS]) {
2101 if (!nft_is_base_chain(chain))
2102 return -EOPNOTSUPP;
2103
2104 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2105 if (IS_ERR(stats))
2106 return PTR_ERR(stats);
2107 }
2108
c6cc94df 2109 err = -ENOMEM;
2c4a488a
PNA		 2110 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2111 sizeof(struct nft_trans_chain));
c6cc94df
FW		 2112 if (trans == NULL)
2113 goto err;
2c4a488a
PNA		 2114
2115 nft_trans_chain_stats(trans) = stats;
2116 nft_trans_chain_update(trans) = true;
2117
2118 if (nla[NFTA_CHAIN_POLICY])
2119 nft_trans_chain_policy(trans) = policy;
2120 else
2121 nft_trans_chain_policy(trans) = -1;
2122
c6cc94df
FW		 2123 if (nla[NFTA_CHAIN_HANDLE] &&
2124 nla[NFTA_CHAIN_NAME]) {
2125 struct nft_trans *tmp;
2126 char *name;
2127
2128 err = -ENOMEM;
2129 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2130 if (!name)
2131 goto err;
2132
2133 err = -EEXIST;
2134 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2135 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2136 tmp->ctx.table == table &&
2137 nft_trans_chain_update(tmp) &&
2138 nft_trans_chain_name(tmp) &&
2139 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2140 kfree(name);
2141 goto err;
2142 }
2c4a488a 2143 }
c6cc94df
FW		 2144
2145 nft_trans_chain_name(trans) = name;
2c4a488a
PNA		 2146 }
2147 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2148
2149 return 0;
c6cc94df
FW		 2150err:
2151 free_percpu(stats);
2152 kfree(trans);
2153 return err;
2c4a488a
PNA		 2154}
2155
633c9a84
PNA		 2156static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2157 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2158 const struct nlattr * const nla[],
2159 struct netlink_ext_ack *extack)
96518518
PM		 2160{
2161 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4035285f
PNA		 2162 u8 genmask = nft_genmask_next(net);
2163 int family = nfmsg->nfgen_family;
74cccc3d 2164 struct nft_chain *chain = NULL;
36dd1bcc 2165 const struct nlattr *attr;
96518518 2166 struct nft_table *table;
57de2a0c 2167 u8 policy = NF_ACCEPT;
4035285f 2168 struct nft_ctx ctx;
96518518 2169 u64 handle = 0;
c9626a2c 2170 u32 flags = 0;
96518518 2171
f102d66b
FW		 2172 lockdep_assert_held(&net->nft.commit_mutex);
2173
cac20fcd 2174 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 2175 if (IS_ERR(table)) {
2176 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2177 return PTR_ERR(table);
36dd1bcc 2178 }
96518518 2179
96518518 2180 chain = NULL;
36dd1bcc 2181 attr = nla[NFTA_CHAIN_NAME];
96518518
PM		 2182
2183 if (nla[NFTA_CHAIN_HANDLE]) {
2184 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
cac20fcd 2185 chain = nft_chain_lookup_byhandle(table, handle, genmask);
36dd1bcc
PNA		 2186 if (IS_ERR(chain)) {
2187 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
96518518 2188 return PTR_ERR(chain);
36dd1bcc
PNA		 2189 }
2190 attr = nla[NFTA_CHAIN_HANDLE];
74cccc3d 2191 } else if (nla[NFTA_CHAIN_NAME]) {
f102d66b 2192 chain = nft_chain_lookup(net, table, attr, genmask);
96518518 2193 if (IS_ERR(chain)) {
36dd1bcc
PNA		 2194 if (PTR_ERR(chain) != -ENOENT) {
2195 NL_SET_BAD_ATTR(extack, attr);
96518518 2196 return PTR_ERR(chain);
36dd1bcc 2197 }
96518518
PM		 2198 chain = NULL;
2199 }
74cccc3d
PNA		 2200 } else if (!nla[NFTA_CHAIN_ID]) {
2201 return -EINVAL;
96518518
PM		 2202 }
2203
57de2a0c 2204 if (nla[NFTA_CHAIN_POLICY]) {
f323d954 2205 if (chain != NULL &&
36dd1bcc
PNA		 2206 !nft_is_base_chain(chain)) {
2207 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
d6b6cb1d 2208 return -EOPNOTSUPP;
36dd1bcc 2209 }
d6b6cb1d
PNA		 2210
2211 if (chain == NULL &&
36dd1bcc
PNA		 2212 nla[NFTA_CHAIN_HOOK] == NULL) {
2213 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
57de2a0c 2214 return -EOPNOTSUPP;
36dd1bcc 2215 }
57de2a0c 2216
8f46df18 2217 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
57de2a0c
PM		 2218 switch (policy) {
2219 case NF_DROP:
2220 case NF_ACCEPT:
2221 break;
2222 default:
2223 return -EINVAL;
2224 }
2225 }
2226
c9626a2c
PNA		 2227 if (nla[NFTA_CHAIN_FLAGS])
2228 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
b717273d
FW		 2229 else if (chain)
2230 flags = chain->flags;
c9626a2c 2231
98319cb9 2232 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
4035285f 2233
96518518 2234 if (chain != NULL) {
36dd1bcc
PNA		 2235 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2236 NL_SET_BAD_ATTR(extack, attr);
96518518 2237 return -EEXIST;
36dd1bcc 2238 }
96518518
PM		 2239 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2240 return -EOPNOTSUPP;
2241
1ed012f6 2242 flags |= chain->flags & NFT_BASE_CHAIN;
c9626a2c 2243 return nf_tables_updchain(&ctx, genmask, policy, flags);
96518518
PM		 2244 }
2245
c9626a2c 2246 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
96518518
PM		 2247}
2248
633c9a84
PNA		 2249static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2250 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2251 const struct nlattr * const nla[],
2252 struct netlink_ext_ack *extack)
96518518
PM		 2253{
2254 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2255 u8 genmask = nft_genmask_next(net);
36dd1bcc
PNA		 2256 int family = nfmsg->nfgen_family;
2257 const struct nlattr *attr;
96518518
PM		 2258 struct nft_table *table;
2259 struct nft_chain *chain;
9dee1474 2260 struct nft_rule *rule;
91c7b38d 2261 struct nft_ctx ctx;
3ecbfd65 2262 u64 handle;
9dee1474
PNA		 2263 u32 use;
2264 int err;
96518518 2265
cac20fcd 2266 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
36dd1bcc
PNA		 2267 if (IS_ERR(table)) {
2268 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
96518518 2269 return PTR_ERR(table);
36dd1bcc 2270 }
96518518 2271
3ecbfd65 2272 if (nla[NFTA_CHAIN_HANDLE]) {
36dd1bcc
PNA		 2273 attr = nla[NFTA_CHAIN_HANDLE];
2274 handle = be64_to_cpu(nla_get_be64(attr));
cac20fcd 2275 chain = nft_chain_lookup_byhandle(table, handle, genmask);
3ecbfd65 2276 } else {
36dd1bcc 2277 attr = nla[NFTA_CHAIN_NAME];
f102d66b 2278 chain = nft_chain_lookup(net, table, attr, genmask);
3ecbfd65 2279 }
36dd1bcc
PNA		 2280 if (IS_ERR(chain)) {
2281 NL_SET_BAD_ATTR(extack, attr);
96518518 2282 return PTR_ERR(chain);
36dd1bcc 2283 }
9dee1474
PNA		 2284
2285 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2286 chain->use > 0)
96518518
PM		 2287 return -EBUSY;
2288
98319cb9 2289 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0165d932 2290
9dee1474
PNA		 2291 use = chain->use;
2292 list_for_each_entry(rule, &chain->rules, list) {
2293 if (!nft_is_active_next(net, rule))
2294 continue;
2295 use--;
2296
2297 err = nft_delrule(&ctx, rule);
2298 if (err < 0)
2299 return err;
2300 }
2301
2302 /* There are rules and elements that are still holding references to us,
2303 * we cannot do a recursive removal in this case.
2304 */
36dd1bcc
PNA		 2305 if (use > 0) {
2306 NL_SET_BAD_ATTR(extack, attr);
9dee1474 2307 return -EBUSY;
36dd1bcc 2308 }
9dee1474 2309
ee01d542 2310 return nft_delchain(&ctx);
96518518
PM		 2311}
2312
96518518
PM		 2313/*
2314 * Expressions
2315 */
2316
2317/**
ef1f7df9
PM		 2318 * nft_register_expr - register nf_tables expr type
2319 * @ops: expr type
96518518 2320 *
ef1f7df9 2321 * Registers the expr type for use with nf_tables. Returns zero on
96518518
PM		 2322 * success or a negative errno code otherwise.
2323 */
ef1f7df9 2324int nft_register_expr(struct nft_expr_type *type)
96518518
PM		 2325{
2326 nfnl_lock(NFNL_SUBSYS_NFTABLES);
758dbcec 2327 if (type->family == NFPROTO_UNSPEC)
e688a7f8 2328 list_add_tail_rcu(&type->list, &nf_tables_expressions);
758dbcec 2329 else
e688a7f8 2330 list_add_rcu(&type->list, &nf_tables_expressions);
96518518
PM		 2331 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2332 return 0;
2333}
2334EXPORT_SYMBOL_GPL(nft_register_expr);
2335
2336/**
ef1f7df9
PM		 2337 * nft_unregister_expr - unregister nf_tables expr type
2338 * @ops: expr type
96518518 2339 *
ef1f7df9 2340 * Unregisters the expr typefor use with nf_tables.
96518518 2341 */
ef1f7df9 2342void nft_unregister_expr(struct nft_expr_type *type)
96518518
PM		 2343{
2344 nfnl_lock(NFNL_SUBSYS_NFTABLES);
e688a7f8 2345 list_del_rcu(&type->list);
96518518
PM		 2346 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2347}
2348EXPORT_SYMBOL_GPL(nft_unregister_expr);
2349
64d46806
PM		 2350static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2351 struct nlattr *nla)
96518518 2352{
9cff126f 2353 const struct nft_expr_type *type, *candidate = NULL;
96518518 2354
ef1f7df9 2355 list_for_each_entry(type, &nf_tables_expressions, list) {
9cff126f
PNA		 2356 if (!nla_strcmp(nla, type->name)) {
2357 if (!type->family && !candidate)
2358 candidate = type;
2359 else if (type->family == family)
2360 candidate = type;
2361 }
96518518 2362 }
9cff126f 2363 return candidate;
96518518
PM		 2364}
2365
b9c04ae7
PNA		 2366#ifdef CONFIG_MODULES
2367static int nft_expr_type_request_module(struct net *net, u8 family,
2368 struct nlattr *nla)
2369{
eb014de4
PNA		 2370 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2371 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
b9c04ae7
PNA		 2372 return -EAGAIN;
2373
2374 return 0;
2375}
2376#endif
2377
452238e8
FW		 2378static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2379 u8 family,
64d46806 2380 struct nlattr *nla)
96518518 2381{
ef1f7df9 2382 const struct nft_expr_type *type;
96518518
PM		 2383
2384 if (nla == NULL)
2385 return ERR_PTR(-EINVAL);
2386
64d46806 2387 type = __nft_expr_type_get(family, nla);
ef1f7df9
PM		 2388 if (type != NULL && try_module_get(type->owner))
2389 return type;
96518518 2390
f102d66b 2391 lockdep_nfnl_nft_mutex_not_held();
96518518 2392#ifdef CONFIG_MODULES
ef1f7df9 2393 if (type == NULL) {
b9c04ae7 2394 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
64d46806
PM		 2395 return ERR_PTR(-EAGAIN);
2396
eb014de4
PNA		 2397 if (nft_request_module(net, "nft-expr-%.*s",
2398 nla_len(nla),
2399 (char *)nla_data(nla)) == -EAGAIN)
96518518
PM		 2400 return ERR_PTR(-EAGAIN);
2401 }
2402#endif
2403 return ERR_PTR(-ENOENT);
2404}
2405
2406static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
9332d27d
FW		 2407 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2408 .len = NFT_MODULE_AUTOLOAD_LIMIT },
96518518
PM		 2409 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2410};
2411
2412static int nf_tables_fill_expr_info(struct sk_buff *skb,
2413 const struct nft_expr *expr)
2414{
ef1f7df9 2415 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
96518518
PM		 2416 goto nla_put_failure;
2417
2418 if (expr->ops->dump) {
ae0be8de
MK		 2419 struct nlattr *data = nla_nest_start_noflag(skb,
2420 NFTA_EXPR_DATA);
96518518
PM		 2421 if (data == NULL)
2422 goto nla_put_failure;
2423 if (expr->ops->dump(skb, expr) < 0)
2424 goto nla_put_failure;
2425 nla_nest_end(skb, data);
2426 }
2427
2428 return skb->len;
2429
2430nla_put_failure:
2431 return -1;
2432};
2433
0b2d8a7b
PM		 2434int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2435 const struct nft_expr *expr)
2436{
2437 struct nlattr *nest;
2438
ae0be8de 2439 nest = nla_nest_start_noflag(skb, attr);
0b2d8a7b
PM		 2440 if (!nest)
2441 goto nla_put_failure;
2442 if (nf_tables_fill_expr_info(skb, expr) < 0)
2443 goto nla_put_failure;
2444 nla_nest_end(skb, nest);
2445 return 0;
2446
2447nla_put_failure:
2448 return -1;
2449}
2450
96518518
PM		 2451struct nft_expr_info {
2452 const struct nft_expr_ops *ops;
ef1f7df9 2453 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
96518518
PM		 2454};
2455
0ca743a5
PNA		 2456static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2457 const struct nlattr *nla,
96518518
PM		 2458 struct nft_expr_info *info)
2459{
ef1f7df9 2460 const struct nft_expr_type *type;
96518518 2461 const struct nft_expr_ops *ops;
ef1f7df9 2462 struct nlattr *tb[NFTA_EXPR_MAX + 1];
96518518
PM		 2463 int err;
2464
8cb08174
JB		 2465 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2466 nft_expr_policy, NULL);
96518518
PM		 2467 if (err < 0)
2468 return err;
2469
452238e8 2470 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
ef1f7df9
PM		 2471 if (IS_ERR(type))
2472 return PTR_ERR(type);
2473
2474 if (tb[NFTA_EXPR_DATA]) {
8cb08174
JB		 2475 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2476 tb[NFTA_EXPR_DATA],
2477 type->policy, NULL);
ef1f7df9
PM		 2478 if (err < 0)
2479 goto err1;
2480 } else
2481 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2482
2483 if (type->select_ops != NULL) {
0ca743a5
PNA		 2484 ops = type->select_ops(ctx,
2485 (const struct nlattr * const *)info->tb);
ef1f7df9
PM		 2486 if (IS_ERR(ops)) {
2487 err = PTR_ERR(ops);
0ef1efd1
PNA		 2488#ifdef CONFIG_MODULES
2489 if (err == -EAGAIN)
eb014de4
PNA		 2490 if (nft_expr_type_request_module(ctx->net,
2491 ctx->family,
2492 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2493 err = -ENOENT;
0ef1efd1 2494#endif
ef1f7df9
PM		 2495 goto err1;
2496 }
2497 } else
2498 ops = type->ops;
2499
96518518
PM		 2500 info->ops = ops;
2501 return 0;
ef1f7df9
PM		 2502
2503err1:
2504 module_put(type->owner);
2505 return err;
96518518
PM		 2506}
2507
2508static int nf_tables_newexpr(const struct nft_ctx *ctx,
ef1f7df9 2509 const struct nft_expr_info *info,
96518518
PM		 2510 struct nft_expr *expr)
2511{
2512 const struct nft_expr_ops *ops = info->ops;
2513 int err;
2514
2515 expr->ops = ops;
2516 if (ops->init) {
ef1f7df9 2517 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
96518518
PM		 2518 if (err < 0)
2519 goto err1;
2520 }
2521
96518518 2522 return 0;
96518518
PM		 2523err1:
2524 expr->ops = NULL;
2525 return err;
2526}
2527
62472bce
PM		 2528static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2529 struct nft_expr *expr)
96518518 2530{
3f3a390d
PNA		 2531 const struct nft_expr_type *type = expr->ops->type;
2532
96518518 2533 if (expr->ops->destroy)
62472bce 2534 expr->ops->destroy(ctx, expr);
3f3a390d 2535 module_put(type->owner);
96518518
PM		 2536}
2537
795a6d6b
PNA		 2538static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2539 const struct nlattr *nla)
0b2d8a7b
PM		 2540{
2541 struct nft_expr_info info;
2542 struct nft_expr *expr;
b8e20400 2543 struct module *owner;
0b2d8a7b
PM		 2544 int err;
2545
2546 err = nf_tables_expr_parse(ctx, nla, &info);
2547 if (err < 0)
2548 goto err1;
2549
2550 err = -ENOMEM;
2551 expr = kzalloc(info.ops->size, GFP_KERNEL);
2552 if (expr == NULL)
2553 goto err2;
2554
2555 err = nf_tables_newexpr(ctx, &info, expr);
2556 if (err < 0)
6cafaf47 2557 goto err3;
0b2d8a7b
PM		 2558
2559 return expr;
6cafaf47
LZ		 2560err3:
2561 kfree(expr);
0b2d8a7b 2562err2:
b8e20400
PNA		 2563 owner = info.ops->type->owner;
2564 if (info.ops->type->release_ops)
2565 info.ops->type->release_ops(info.ops);
2566
2567 module_put(owner);
0b2d8a7b
PM		 2568err1:
2569 return ERR_PTR(err);
2570}
2571
c604cc69
PNA		 2572int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2573{
2574 int err;
2575
2576 if (src->ops->clone) {
2577 dst->ops = src->ops;
2578 err = src->ops->clone(dst, src);
2579 if (err < 0)
2580 return err;
2581 } else {
2582 memcpy(dst, src, src->ops->size);
2583 }
2584
2585 __module_get(src->ops->type->owner);
2586
2587 return 0;
2588}
2589
0b2d8a7b
PM		 2590void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2591{
2592 nf_tables_expr_destroy(ctx, expr);
2593 kfree(expr);
2594}
2595
96518518
PM		 2596/*
2597 * Rules
2598 */
2599
cac20fcd
PNA		 2600static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2601 u64 handle)
96518518
PM		 2602{
2603 struct nft_rule *rule;
2604
2605 // FIXME: this sucks
d9adf22a 2606 list_for_each_entry_rcu(rule, &chain->rules, list) {
96518518
PM		 2607 if (handle == rule->handle)
2608 return rule;
2609 }
2610
2611 return ERR_PTR(-ENOENT);
2612}
2613
cac20fcd
PNA		 2614static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2615 const struct nlattr *nla)
96518518
PM		 2616{
2617 if (nla == NULL)
2618 return ERR_PTR(-EINVAL);
2619
cac20fcd 2620 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
96518518
PM		 2621}
2622
2623static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
b2fbd044
LZ		 2624 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2625 .len = NFT_TABLE_MAXNAMELEN - 1 },
96518518
PM		 2626 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2627 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2628 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2629 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
0ca743a5 2630 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
5e948466 2631 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
0768b3b3
PNA		 2632 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2633 .len = NFT_USERDATA_MAXLEN },
467697d2 2634 [NFTA_RULE_ID] = { .type = NLA_U32 },
0604628b 2635 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
96518518
PM		 2636};
2637
84d7fce6
PNA		 2638static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2639 u32 portid, u32 seq, int event,
2640 u32 flags, int family,
96518518
PM		 2641 const struct nft_table *table,
2642 const struct nft_chain *chain,
2c82c7e7
FW		 2643 const struct nft_rule *rule,
2644 const struct nft_rule *prule)
96518518
PM		 2645{
2646 struct nlmsghdr *nlh;
2647 struct nfgenmsg *nfmsg;
2648 const struct nft_expr *expr, *next;
2649 struct nlattr *list;
dedb67c4 2650 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
96518518 2651
dedb67c4 2652 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
96518518
PM		 2653 if (nlh == NULL)
2654 goto nla_put_failure;
2655
2656 nfmsg = nlmsg_data(nlh);
2657 nfmsg->nfgen_family = family;
2658 nfmsg->version = NFNETLINK_V0;
84d7fce6 2659 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
96518518
PM		 2660
2661 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2662 goto nla_put_failure;
2663 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2664 goto nla_put_failure;
b46f6ded
ND		 2665 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2666 NFTA_RULE_PAD))
96518518
PM		 2667 goto nla_put_failure;
2668
2c82c7e7 2669 if (event != NFT_MSG_DELRULE && prule) {
5e948466 2670 if (nla_put_be64(skb, NFTA_RULE_POSITION,
b46f6ded
ND		 2671 cpu_to_be64(prule->handle),
2672 NFTA_RULE_PAD))
5e948466
EL		 2673 goto nla_put_failure;
2674 }
2675
ae0be8de 2676 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
96518518
PM		 2677 if (list == NULL)
2678 goto nla_put_failure;
2679 nft_rule_for_each_expr(expr, next, rule) {
0b2d8a7b 2680 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
96518518 2681 goto nla_put_failure;
96518518
PM		 2682 }
2683 nla_nest_end(skb, list);
2684
86f1ec32
PM		 2685 if (rule->udata) {
2686 struct nft_userdata *udata = nft_userdata(rule);
2687 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2688 udata->data) < 0)
2689 goto nla_put_failure;
2690 }
0768b3b3 2691
053c095a
JB		 2692 nlmsg_end(skb, nlh);
2693 return 0;
96518518
PM		 2694
2695nla_put_failure:
2696 nlmsg_trim(skb, nlh);
2697 return -1;
2698}
2699
25e94a99
PNA		 2700static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2701 const struct nft_rule *rule, int event)
96518518
PM		 2702{
2703 struct sk_buff *skb;
96518518
PM		 2704 int err;
2705
128ad332
PNA		 2706 if (!ctx->report &&
2707 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 2708 return;
96518518 2709
96518518
PM		 2710 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2711 if (skb == NULL)
2712 goto err;
2713
84d7fce6 2714 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
36596dad 2715 event, 0, ctx->family, ctx->table,
2c82c7e7 2716 ctx->chain, rule, NULL);
96518518
PM		 2717 if (err < 0) {
2718 kfree_skb(skb);
2719 goto err;
2720 }
2721
25e94a99
PNA		 2722 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2723 ctx->report, GFP_KERNEL);
2724 return;
96518518 2725err:
25e94a99 2726 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
96518518
PM		 2727}
2728
6e1f760e 2729struct nft_rule_dump_ctx {
e46abbcc 2730 char *table;
b7263e07 2731 char *chain;
6e1f760e
PNA		 2732};
2733
241faece
PS		 2734static int __nf_tables_dump_rules(struct sk_buff *skb,
2735 unsigned int *idx,
2736 struct netlink_callback *cb,
2737 const struct nft_table *table,
2738 const struct nft_chain *chain)
2739{
2740 struct net *net = sock_net(skb->sk);
2c82c7e7 2741 const struct nft_rule *rule, *prule;
241faece 2742 unsigned int s_idx = cb->args[0];
241faece 2743
2c82c7e7 2744 prule = NULL;
241faece
PS		 2745 list_for_each_entry_rcu(rule, &chain->rules, list) {
2746 if (!nft_is_active(net, rule))
2c82c7e7 2747 goto cont_skip;
241faece
PS		 2748 if (*idx < s_idx)
2749 goto cont;
2750 if (*idx > s_idx) {
2751 memset(&cb->args[1], 0,
2752 sizeof(cb->args) - sizeof(cb->args[0]));
2753 }
2754 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2755 cb->nlh->nlmsg_seq,
2756 NFT_MSG_NEWRULE,
2757 NLM_F_MULTI | NLM_F_APPEND,
2758 table->family,
2c82c7e7 2759 table, chain, rule, prule) < 0)
310529e6 2760 return 1;
241faece
PS		 2761
2762 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2763cont:
2c82c7e7
FW		 2764 prule = rule;
2765cont_skip:
241faece
PS		 2766 (*idx)++;
2767 }
310529e6 2768 return 0;
241faece
PS		 2769}
2770
96518518
PM		 2771static int nf_tables_dump_rules(struct sk_buff *skb,
2772 struct netlink_callback *cb)
2773{
2774 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6e1f760e 2775 const struct nft_rule_dump_ctx *ctx = cb->data;
241faece 2776 struct nft_table *table;
96518518 2777 const struct nft_chain *chain;
241faece 2778 unsigned int idx = 0;
99633ab2 2779 struct net *net = sock_net(skb->sk);
96518518
PM		 2780 int family = nfmsg->nfgen_family;
2781
e688a7f8 2782 rcu_read_lock();
38e029f1
PNA		 2783 cb->seq = net->nft.base_seq;
2784
36596dad 2785 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 2786 if (family != NFPROTO_UNSPEC && family != table->family)
36596dad
PNA		 2787 continue;
2788
2789 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
96518518
PM		 2790 continue;
2791
715849ab 2792 if (ctx && ctx->table && ctx->chain) {
241faece 2793 struct rhlist_head *list, *tmp;
6e1f760e 2794
241faece
PS		 2795 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2796 nft_chain_ht_params);
2797 if (!list)
2798 goto done;
2799
2800 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2801 if (!nft_is_active(net, chain))
2802 continue;
2803 __nf_tables_dump_rules(skb, &idx,
2804 cb, table, chain);
2805 break;
96518518 2806 }
241faece 2807 goto done;
96518518 2808 }
241faece
PS		 2809
2810 list_for_each_entry_rcu(chain, &table->chains, list) {
2811 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2812 goto done;
2813 }
2814
2815 if (ctx && ctx->table)
2816 break;
96518518
PM		 2817 }
2818done:
e688a7f8 2819 rcu_read_unlock();
310529e6
PS		 2820
2821 cb->args[0] = idx;
96518518
PM		 2822 return skb->len;
2823}
2824
90fd131a
FW		 2825static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2826{
2827 const struct nlattr * const *nla = cb->data;
2828 struct nft_rule_dump_ctx *ctx = NULL;
2829
2830 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2831 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2832 if (!ctx)
2833 return -ENOMEM;
2834
2835 if (nla[NFTA_RULE_TABLE]) {
2836 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2837 GFP_ATOMIC);
2838 if (!ctx->table) {
2839 kfree(ctx);
2840 return -ENOMEM;
2841 }
2842 }
2843 if (nla[NFTA_RULE_CHAIN]) {
2844 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2845 GFP_ATOMIC);
2846 if (!ctx->chain) {
2847 kfree(ctx->table);
2848 kfree(ctx);
2849 return -ENOMEM;
2850 }
2851 }
2852 }
2853
2854 cb->data = ctx;
2855 return 0;
2856}
2857
6e1f760e
PNA		 2858static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2859{
e46abbcc
PS		 2860 struct nft_rule_dump_ctx *ctx = cb->data;
2861
2862 if (ctx) {
2863 kfree(ctx->table);
b7263e07 2864 kfree(ctx->chain);
e46abbcc
PS		 2865 kfree(ctx);
2866 }
6e1f760e
PNA		 2867 return 0;
2868}
2869
d9adf22a 2870/* called with rcu_read_lock held */
7b8002a1
PNA		 2871static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2872 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 2873 const struct nlattr * const nla[],
2874 struct netlink_ext_ack *extack)
96518518
PM		 2875{
2876 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 2877 u8 genmask = nft_genmask_cur(net);
96518518
PM		 2878 const struct nft_chain *chain;
2879 const struct nft_rule *rule;
1b2470e5 2880 struct nft_table *table;
96518518
PM		 2881 struct sk_buff *skb2;
2882 int family = nfmsg->nfgen_family;
2883 int err;
2884
2885 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2886 struct netlink_dump_control c = {
90fd131a 2887 .start= nf_tables_dump_rules_start,
96518518 2888 .dump = nf_tables_dump_rules,
6e1f760e 2889 .done = nf_tables_dump_rules_done,
d9adf22a 2890 .module = THIS_MODULE,
90fd131a 2891 .data = (void *)nla,
96518518 2892 };
6e1f760e 2893
d9adf22a 2894 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
96518518
PM		 2895 }
2896
cac20fcd 2897 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 2898 if (IS_ERR(table)) {
2899 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 2900 return PTR_ERR(table);
36dd1bcc 2901 }
96518518 2902
f102d66b 2903 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 2904 if (IS_ERR(chain)) {
2905 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 2906 return PTR_ERR(chain);
36dd1bcc 2907 }
96518518 2908
cac20fcd 2909 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 2910 if (IS_ERR(rule)) {
2911 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 2912 return PTR_ERR(rule);
36dd1bcc 2913 }
96518518 2914
d9adf22a 2915 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
96518518
PM		 2916 if (!skb2)
2917 return -ENOMEM;
2918
84d7fce6 2919 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
96518518 2920 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2c82c7e7 2921 family, table, chain, rule, NULL);
96518518
PM		 2922 if (err < 0)
2923 goto err;
2924
2925 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2926
2927err:
2928 kfree_skb(skb2);
2929 return err;
2930}
2931
62472bce
PM		 2932static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2933 struct nft_rule *rule)
96518518 2934{
29e38801 2935 struct nft_expr *expr, *next;
96518518
PM		 2936
2937 /*
2938 * Careful: some expressions might not be initialized in case this
2939 * is called on error from nf_tables_newrule().
2940 */
2941 expr = nft_expr_first(rule);
3e38df13 2942 while (expr != nft_expr_last(rule) && expr->ops) {
29e38801 2943 next = nft_expr_next(expr);
62472bce 2944 nf_tables_expr_destroy(ctx, expr);
29e38801 2945 expr = next;
96518518
PM		 2946 }
2947 kfree(rule);
2948}
2949
bb7b40ae
PNA		 2950static void nf_tables_rule_release(const struct nft_ctx *ctx,
2951 struct nft_rule *rule)
2952{
f6ac8585 2953 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
bb7b40ae
PNA		 2954 nf_tables_rule_destroy(ctx, rule);
2955}
2956
a654de8f
PNA		 2957int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
2958{
2959 struct nft_expr *expr, *last;
2960 const struct nft_data *data;
2961 struct nft_rule *rule;
2962 int err;
2963
26b2f552
TY		 2964 if (ctx->level == NFT_JUMP_STACK_SIZE)
2965 return -EMLINK;
2966
a654de8f
PNA		 2967 list_for_each_entry(rule, &chain->rules, list) {
2968 if (!nft_is_active_next(ctx->net, rule))
2969 continue;
2970
2971 nft_rule_for_each_expr(expr, last, rule) {
2972 if (!expr->ops->validate)
2973 continue;
2974
2975 err = expr->ops->validate(ctx, expr, &data);
2976 if (err < 0)
2977 return err;
2978 }
2979 }
2980
2981 return 0;
2982}
2983EXPORT_SYMBOL_GPL(nft_chain_validate);
2984
2985static int nft_table_validate(struct net *net, const struct nft_table *table)
2986{
2987 struct nft_chain *chain;
2988 struct nft_ctx ctx = {
2989 .net = net,
2990 .family = table->family,
2991 };
2992 int err;
2993
2994 list_for_each_entry(chain, &table->chains, list) {
2995 if (!nft_is_base_chain(chain))
2996 continue;
2997
2998 ctx.chain = chain;
2999 err = nft_chain_validate(&ctx, chain);
3000 if (err < 0)
3001 return err;
3002 }
3003
3004 return 0;
3005}
3006
75dd48e2
PS		 3007static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3008 const struct nlattr *nla);
3009
1081d11b
PNA		 3010#define NFT_RULE_MAXEXPRS 128
3011
633c9a84
PNA		 3012static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3013 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3014 const struct nlattr * const nla[],
3015 struct netlink_ext_ack *extack)
96518518
PM		 3016{
3017 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3018 u8 genmask = nft_genmask_next(net);
2a43ecf9 3019 struct nft_expr_info *info = NULL;
98319cb9 3020 int family = nfmsg->nfgen_family;
c9626a2c 3021 struct nft_flow_rule *flow;
96518518
PM		 3022 struct nft_table *table;
3023 struct nft_chain *chain;
3024 struct nft_rule *rule, *old_rule = NULL;
86f1ec32 3025 struct nft_userdata *udata;
1081d11b 3026 struct nft_trans *trans = NULL;
96518518
PM		 3027 struct nft_expr *expr;
3028 struct nft_ctx ctx;
3029 struct nlattr *tmp;
86f1ec32 3030 unsigned int size, i, n, ulen = 0, usize = 0;
96518518 3031 int err, rem;
5e948466 3032 u64 handle, pos_handle;
96518518 3033
f102d66b
FW		 3034 lockdep_assert_held(&net->nft.commit_mutex);
3035
cac20fcd 3036 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 3037 if (IS_ERR(table)) {
3038 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3039 return PTR_ERR(table);
36dd1bcc 3040 }
96518518 3041
f102d66b 3042 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
36dd1bcc
PNA		 3043 if (IS_ERR(chain)) {
3044 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
96518518 3045 return PTR_ERR(chain);
36dd1bcc 3046 }
96518518
PM		 3047
3048 if (nla[NFTA_RULE_HANDLE]) {
3049 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
cac20fcd 3050 rule = __nft_rule_lookup(chain, handle);
36dd1bcc
PNA		 3051 if (IS_ERR(rule)) {
3052 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3053 return PTR_ERR(rule);
36dd1bcc 3054 }
96518518 3055
36dd1bcc
PNA		 3056 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3057 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
96518518 3058 return -EEXIST;
36dd1bcc 3059 }
96518518
PM		 3060 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3061 old_rule = rule;
3062 else
3063 return -EOPNOTSUPP;
3064 } else {
445509eb
PNA		 3065 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3066 nlh->nlmsg_flags & NLM_F_REPLACE)
96518518
PM		 3067 return -EINVAL;
3068 handle = nf_tables_alloc_handle(table);
a0a7379e
PNA		 3069
3070 if (chain->use == UINT_MAX)
3071 return -EOVERFLOW;
5e948466 3072
447750f2
FW		 3073 if (nla[NFTA_RULE_POSITION]) {
3074 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3075 old_rule = __nft_rule_lookup(chain, pos_handle);
3076 if (IS_ERR(old_rule)) {
3077 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3078 return PTR_ERR(old_rule);
3079 }
75dd48e2
PS		 3080 } else if (nla[NFTA_RULE_POSITION_ID]) {
3081 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3082 if (IS_ERR(old_rule)) {
3083 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3084 return PTR_ERR(old_rule);
3085 }
36dd1bcc 3086 }
5e948466
EL		 3087 }
3088
98319cb9 3089 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0ca743a5 3090
96518518
PM		 3091 n = 0;
3092 size = 0;
3093 if (nla[NFTA_RULE_EXPRESSIONS]) {
2a43ecf9
FW		 3094 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3095 sizeof(struct nft_expr_info),
3096 GFP_KERNEL);
3097 if (!info)
3098 return -ENOMEM;
3099
96518518
PM		 3100 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3101 err = -EINVAL;
3102 if (nla_type(tmp) != NFTA_LIST_ELEM)
3103 goto err1;
3104 if (n == NFT_RULE_MAXEXPRS)
3105 goto err1;
0ca743a5 3106 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
96518518
PM		 3107 if (err < 0)
3108 goto err1;
3109 size += info[n].ops->size;
3110 n++;
3111 }
3112 }
9889840f
PM		 3113 /* Check for overflow of dlen field */
3114 err = -EFBIG;
3115 if (size >= 1 << 12)
3116 goto err1;
96518518 3117
86f1ec32 3118 if (nla[NFTA_RULE_USERDATA]) {
0768b3b3 3119 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
86f1ec32
PM		 3120 if (ulen > 0)
3121 usize = sizeof(struct nft_userdata) + ulen;
3122 }
0768b3b3 3123
96518518 3124 err = -ENOMEM;
86f1ec32 3125 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
96518518
PM		 3126 if (rule == NULL)
3127 goto err1;
3128
889f7ee7 3129 nft_activate_next(net, rule);
0628b123 3130
96518518
PM		 3131 rule->handle = handle;
3132 rule->dlen = size;
86f1ec32 3133 rule->udata = ulen ? 1 : 0;
0768b3b3 3134
86f1ec32
PM		 3135 if (ulen) {
3136 udata = nft_userdata(rule);
3137 udata->len = ulen - 1;
3138 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3139 }
96518518 3140
96518518
PM		 3141 expr = nft_expr_first(rule);
3142 for (i = 0; i < n; i++) {
3143 err = nf_tables_newexpr(&ctx, &info[i], expr);
3144 if (err < 0)
3145 goto err2;
a654de8f
PNA		 3146
3147 if (info[i].ops->validate)
3148 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3149
ef1f7df9 3150 info[i].ops = NULL;
96518518
PM		 3151 expr = nft_expr_next(expr);
3152 }
3153
96518518 3154 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
ca089878 3155 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
569ccae6
FW		 3156 if (trans == NULL) {
3157 err = -ENOMEM;
3158 goto err2;
3159 }
ca089878
TY		 3160 err = nft_delrule(&ctx, old_rule);
3161 if (err < 0) {
3162 nft_trans_destroy(trans);
569ccae6
FW		 3163 goto err2;
3164 }
3165
3166 list_add_tail_rcu(&rule->list, &old_rule->list);
3167 } else {
c9626a2c
PNA		 3168 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3169 if (!trans) {
569ccae6
FW		 3170 err = -ENOMEM;
3171 goto err2;
3172 }
3173
3174 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3175 if (old_rule)
3176 list_add_rcu(&rule->list, &old_rule->list);
3177 else
3178 list_add_tail_rcu(&rule->list, &chain->rules);
3179 } else {
3180 if (old_rule)
3181 list_add_tail_rcu(&rule->list, &old_rule->list);
3182 else
3183 list_add_rcu(&rule->list, &chain->rules);
3184 }
0628b123 3185 }
2a43ecf9 3186 kvfree(info);
4fefee57 3187 chain->use++;
96518518 3188
a654de8f
PNA		 3189 if (net->nft.validate_state == NFT_VALIDATE_DO)
3190 return nft_table_validate(net, table);
3191
c9626a2c 3192 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
be2861dc 3193 flow = nft_flow_rule_create(net, rule);
c9626a2c
PNA		 3194 if (IS_ERR(flow))
3195 return PTR_ERR(flow);
3196
3197 nft_trans_flow_rule(trans) = flow;
3198 }
3199
a654de8f 3200 return 0;
96518518 3201err2:
bb7b40ae 3202 nf_tables_rule_release(&ctx, rule);
96518518
PM		 3203err1:
3204 for (i = 0; i < n; i++) {
b25a31bf 3205 if (info[i].ops) {
ef1f7df9 3206 module_put(info[i].ops->type->owner);
b25a31bf
TY		 3207 if (info[i].ops->type->release_ops)
3208 info[i].ops->type->release_ops(info[i].ops);
3209 }
96518518 3210 }
2a43ecf9 3211 kvfree(info);
96518518
PM		 3212 return err;
3213}
3214
1a94e38d
PNA		 3215static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3216 const struct nlattr *nla)
3217{
3218 u32 id = ntohl(nla_get_be32(nla));
3219 struct nft_trans *trans;
3220
3221 list_for_each_entry(trans, &net->nft.commit_list, list) {
3222 struct nft_rule *rule = nft_trans_rule(trans);
3223
3224 if (trans->msg_type == NFT_MSG_NEWRULE &&
3225 id == nft_trans_rule_id(trans))
3226 return rule;
3227 }
3228 return ERR_PTR(-ENOENT);
3229}
3230
633c9a84
PNA		 3231static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3232 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3233 const struct nlattr * const nla[],
3234 struct netlink_ext_ack *extack)
96518518
PM		 3235{
3236 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3237 u8 genmask = nft_genmask_next(net);
7c95f6d8 3238 struct nft_table *table;
cf9dc09d
PNA		 3239 struct nft_chain *chain = NULL;
3240 struct nft_rule *rule;
0628b123
PNA		 3241 int family = nfmsg->nfgen_family, err = 0;
3242 struct nft_ctx ctx;
96518518 3243
cac20fcd 3244 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
36dd1bcc
PNA		 3245 if (IS_ERR(table)) {
3246 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
96518518 3247 return PTR_ERR(table);
36dd1bcc 3248 }
96518518 3249
cf9dc09d 3250 if (nla[NFTA_RULE_CHAIN]) {
f102d66b
FW		 3251 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3252 genmask);
36dd1bcc
PNA		 3253 if (IS_ERR(chain)) {
3254 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
cf9dc09d 3255 return PTR_ERR(chain);
36dd1bcc 3256 }
cf9dc09d 3257 }
96518518 3258
98319cb9 3259 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
0628b123 3260
cf9dc09d
PNA		 3261 if (chain) {
3262 if (nla[NFTA_RULE_HANDLE]) {
cac20fcd 3263 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
36dd1bcc
PNA		 3264 if (IS_ERR(rule)) {
3265 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
cf9dc09d 3266 return PTR_ERR(rule);
36dd1bcc 3267 }
96518518 3268
1a94e38d
PNA		 3269 err = nft_delrule(&ctx, rule);
3270 } else if (nla[NFTA_RULE_ID]) {
3271 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
36dd1bcc
PNA		 3272 if (IS_ERR(rule)) {
3273 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
1a94e38d 3274 return PTR_ERR(rule);
36dd1bcc 3275 }
1a94e38d 3276
5e266fe7 3277 err = nft_delrule(&ctx, rule);
cf9dc09d 3278 } else {
ce24b721 3279 err = nft_delrule_by_chain(&ctx);
cf9dc09d
PNA		 3280 }
3281 } else {
3282 list_for_each_entry(chain, &table->chains, list) {
664b0f8c
PNA		 3283 if (!nft_is_active_next(net, chain))
3284 continue;
3285
cf9dc09d 3286 ctx.chain = chain;
ce24b721 3287 err = nft_delrule_by_chain(&ctx);
0628b123
PNA		 3288 if (err < 0)
3289 break;
3290 }
3291 }
3292
3293 return err;
3294}
3295
20a69341
PM		 3296/*
3297 * Sets
3298 */
e32a4dc6
FW		 3299static const struct nft_set_type *nft_set_types[] = {
3300 &nft_set_hash_fast_type,
3301 &nft_set_hash_type,
3302 &nft_set_rhash_type,
3303 &nft_set_bitmap_type,
3304 &nft_set_rbtree_type,
e6abef61 3305#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
7400b063
SB		 3306 &nft_set_pipapo_avx2_type,
3307#endif
e32a4dc6
FW		 3308 &nft_set_pipapo_type,
3309};
20a69341 3310
2b664957 3311#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
71cc0873
PS		 3312 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3313 NFT_SET_EVAL)
2b664957 3314
71cc0873 3315static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
2b664957 3316{
71cc0873 3317 return (flags & type->features) == (flags & NFT_SET_FEATURES);
2b664957
PNA		 3318}
3319
c50b960c
PM		 3320/*
3321 * Select a set implementation based on the data characteristics and the
3322 * given policy. The total memory use might not be known if no size is
3323 * given, in that case the amount of memory per element is used.
3324 */
3325static const struct nft_set_ops *
2b664957
PNA		 3326nft_select_set_ops(const struct nft_ctx *ctx,
3327 const struct nlattr * const nla[],
c50b960c
PM		 3328 const struct nft_set_desc *desc,
3329 enum nft_set_policies policy)
20a69341 3330{
c50b960c
PM		 3331 const struct nft_set_ops *ops, *bops;
3332 struct nft_set_estimate est, best;
2b664957
PNA		 3333 const struct nft_set_type *type;
3334 u32 flags = 0;
e32a4dc6 3335 int i;
20a69341 3336
f102d66b
FW		 3337 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3338 lockdep_nfnl_nft_mutex_not_held();
e32a4dc6 3339
2b664957
PNA		 3340 if (nla[NFTA_SET_FLAGS] != NULL)
3341 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
20a69341 3342
55af753c
PNA		 3343 bops = NULL;
3344 best.size = ~0;
3345 best.lookup = ~0;
0b5a7874 3346 best.space = ~0;
c50b960c 3347
e32a4dc6
FW		 3348 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3349 type = nft_set_types[i];
71cc0873 3350 ops = &type->ops;
2b664957 3351
71cc0873 3352 if (!nft_set_ops_candidate(type, flags))
20a69341 3353 continue;
2b664957 3354 if (!ops->estimate(desc, flags, &est))
c50b960c
PM		 3355 continue;
3356
3357 switch (policy) {
3358 case NFT_SET_POL_PERFORMANCE:
55af753c 3359 if (est.lookup < best.lookup)
c50b960c 3360 break;
644e334e
PNA		 3361 if (est.lookup == best.lookup &&
3362 est.space < best.space)
3363 break;
c50b960c
PM		 3364 continue;
3365 case NFT_SET_POL_MEMORY:
0b5a7874
PNA		 3366 if (!desc->size) {
3367 if (est.space < best.space)
3368 break;
3369 if (est.space == best.space &&
3370 est.lookup < best.lookup)
3371 break;
4f2921ca 3372 } else if (est.size < best.size || !bops) {
c50b960c 3373 break;
0b5a7874 3374 }
c50b960c
PM		 3375 continue;
3376 default:
3377 break;
3378 }
3379
c50b960c
PM		 3380 bops = ops;
3381 best = est;
20a69341
PM		 3382 }
3383
c50b960c
PM		 3384 if (bops != NULL)
3385 return bops;
3386
20a69341
PM		 3387 return ERR_PTR(-EOPNOTSUPP);
3388}
3389
3390static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
b2fbd044
LZ		 3391 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3392 .len = NFT_TABLE_MAXNAMELEN - 1 },
a9bdd836 3393 [NFTA_SET_NAME] = { .type = NLA_STRING,
cb39ad8b 3394 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341
PM		 3395 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3396 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3397 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3398 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3399 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
c50b960c
PM		 3400 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3401 [NFTA_SET_DESC] = { .type = NLA_NESTED },
958bee14 3402 [NFTA_SET_ID] = { .type = NLA_U32 },
761da293
PM		 3403 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3404 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
e6d8ecac
CFG		 3405 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3406 .len = NFT_USERDATA_MAXLEN },
8aeff920 3407 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3ecbfd65 3408 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
65038428 3409 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
c50b960c
PM		 3410};
3411
3412static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3413 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
f3a2181e 3414 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
20a69341
PM		 3415};
3416
633c9a84 3417static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 3418 const struct sk_buff *skb,
3419 const struct nlmsghdr *nlh,
f2a6d766 3420 const struct nlattr * const nla[],
36dd1bcc 3421 struct netlink_ext_ack *extack,
f2a6d766 3422 u8 genmask)
20a69341
PM		 3423{
3424 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 3425 int family = nfmsg->nfgen_family;
7c95f6d8 3426 struct nft_table *table = NULL;
20a69341 3427
20a69341 3428 if (nla[NFTA_SET_TABLE] != NULL) {
cac20fcd
PNA		 3429 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3430 genmask);
36dd1bcc
PNA		 3431 if (IS_ERR(table)) {
3432 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 3433 return PTR_ERR(table);
36dd1bcc 3434 }
20a69341
PM		 3435 }
3436
98319cb9 3437 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 3438 return 0;
3439}
3440
cac20fcd
PNA		 3441static struct nft_set *nft_set_lookup(const struct nft_table *table,
3442 const struct nlattr *nla, u8 genmask)
20a69341
PM		 3443{
3444 struct nft_set *set;
3445
3446 if (nla == NULL)
3447 return ERR_PTR(-EINVAL);
3448
d9adf22a 3449 list_for_each_entry_rcu(set, &table->sets, list) {
37a9cc52
PNA		 3450 if (!nla_strcmp(nla, set->name) &&
3451 nft_active_genmask(set, genmask))
20a69341
PM		 3452 return set;
3453 }
3454 return ERR_PTR(-ENOENT);
3455}
3456
cac20fcd
PNA		 3457static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3458 const struct nlattr *nla,
3459 u8 genmask)
3ecbfd65
HS		 3460{
3461 struct nft_set *set;
3462
3ecbfd65
HS		 3463 list_for_each_entry(set, &table->sets, list) {
3464 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3465 nft_active_genmask(set, genmask))
3466 return set;
3467 }
3468 return ERR_PTR(-ENOENT);
3469}
3470
cac20fcd
PNA		 3471static struct nft_set *nft_set_lookup_byid(const struct net *net,
3472 const struct nlattr *nla, u8 genmask)
958bee14
PNA		 3473{
3474 struct nft_trans *trans;
3475 u32 id = ntohl(nla_get_be32(nla));
3476
3477 list_for_each_entry(trans, &net->nft.commit_list, list) {
9c7f96fd
AK		 3478 if (trans->msg_type == NFT_MSG_NEWSET) {
3479 struct nft_set *set = nft_trans_set(trans);
37a9cc52 3480
9c7f96fd
AK		 3481 if (id == nft_trans_set_id(trans) &&
3482 nft_active_genmask(set, genmask))
3483 return set;
3484 }
958bee14
PNA		 3485 }
3486 return ERR_PTR(-ENOENT);
3487}
c7a72e3f 3488
10659cba
PNA		 3489struct nft_set *nft_set_lookup_global(const struct net *net,
3490 const struct nft_table *table,
3491 const struct nlattr *nla_set_name,
3492 const struct nlattr *nla_set_id,
3493 u8 genmask)
c7a72e3f
PNA		 3494{
3495 struct nft_set *set;
3496
cac20fcd 3497 set = nft_set_lookup(table, nla_set_name, genmask);
c7a72e3f
PNA		 3498 if (IS_ERR(set)) {
3499 if (!nla_set_id)
3500 return set;
3501
cac20fcd 3502 set = nft_set_lookup_byid(net, nla_set_id, genmask);
c7a72e3f
PNA		 3503 }
3504 return set;
3505}
10659cba 3506EXPORT_SYMBOL_GPL(nft_set_lookup_global);
958bee14 3507
20a69341
PM		 3508static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3509 const char *name)
3510{
3511 const struct nft_set *i;
3512 const char *p;
3513 unsigned long *inuse;
60eb1894 3514 unsigned int n = 0, min = 0;
20a69341 3515
38745490 3516 p = strchr(name, '%');
20a69341
PM		 3517 if (p != NULL) {
3518 if (p[1] != 'd' || strchr(p + 2, '%'))
3519 return -EINVAL;
3520
3521 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3522 if (inuse == NULL)
3523 return -ENOMEM;
60eb1894 3524cont:
20a69341 3525 list_for_each_entry(i, &ctx->table->sets, list) {
14662917
DB		 3526 int tmp;
3527
37a9cc52
PNA		 3528 if (!nft_is_active_next(ctx->net, set))
3529 continue;
14662917 3530 if (!sscanf(i->name, name, &tmp))
20a69341 3531 continue;
60eb1894 3532 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
20a69341 3533 continue;
14662917 3534
60eb1894 3535 set_bit(tmp - min, inuse);
20a69341
PM		 3536 }
3537
53b70287 3538 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
60eb1894
PM		 3539 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3540 min += BITS_PER_BYTE * PAGE_SIZE;
3541 memset(inuse, 0, PAGE_SIZE);
3542 goto cont;
3543 }
20a69341
PM		 3544 free_page((unsigned long)inuse);
3545 }
3546
38745490
PS		 3547 set->name = kasprintf(GFP_KERNEL, name, min + n);
3548 if (!set->name)
3549 return -ENOMEM;
3550
20a69341 3551 list_for_each_entry(i, &ctx->table->sets, list) {
37a9cc52
PNA		 3552 if (!nft_is_active_next(ctx->net, i))
3553 continue;
e63aaaa6
AY		 3554 if (!strcmp(set->name, i->name)) {
3555 kfree(set->name);
7fb6f78d 3556 set->name = NULL;
20a69341 3557 return -ENFILE;
e63aaaa6 3558 }
20a69341
PM		 3559 }
3560 return 0;
3561}
3562
8e1102d5
FW		 3563static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3564{
3565 u64 ms = be64_to_cpu(nla_get_be64(nla));
3566 u64 max = (u64)(~((u64)0));
3567
3568 max = div_u64(max, NSEC_PER_MSEC);
3569 if (ms >= max)
3570 return -ERANGE;
3571
3572 ms *= NSEC_PER_MSEC;
3573 *result = nsecs_to_jiffies64(ms);
3574 return 0;
3575}
3576
d6501de8 3577static __be64 nf_jiffies64_to_msecs(u64 input)
8e1102d5 3578{
3b15d09f 3579 return cpu_to_be64(jiffies64_to_msecs(input));
8e1102d5
FW		 3580}
3581
f3a2181e
SB		 3582static int nf_tables_fill_set_concat(struct sk_buff *skb,
3583 const struct nft_set *set)
3584{
3585 struct nlattr *concat, *field;
3586 int i;
3587
3588 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3589 if (!concat)
3590 return -ENOMEM;
3591
3592 for (i = 0; i < set->field_count; i++) {
3593 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3594 if (!field)
3595 return -ENOMEM;
3596
3597 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3598 htonl(set->field_len[i])))
3599 return -ENOMEM;
3600
3601 nla_nest_end(skb, field);
3602 }
3603
3604 nla_nest_end(skb, concat);
3605
3606 return 0;
3607}
3608
20a69341
PM		 3609static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3610 const struct nft_set *set, u16 event, u16 flags)
3611{
3612 struct nfgenmsg *nfmsg;
3613 struct nlmsghdr *nlh;
128ad332 3614 u32 portid = ctx->portid;
65038428 3615 struct nlattr *nest;
128ad332 3616 u32 seq = ctx->seq;
20a69341 3617
dedb67c4 3618 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
20a69341
PM		 3619 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3620 flags);
3621 if (nlh == NULL)
3622 goto nla_put_failure;
3623
3624 nfmsg = nlmsg_data(nlh);
36596dad 3625 nfmsg->nfgen_family = ctx->family;
20a69341 3626 nfmsg->version = NFNETLINK_V0;
84d7fce6 3627 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
20a69341
PM		 3628
3629 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3630 goto nla_put_failure;
3631 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3632 goto nla_put_failure;
3ecbfd65
HS		 3633 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3634 NFTA_SET_PAD))
3635 goto nla_put_failure;
20a69341
PM		 3636 if (set->flags != 0)
3637 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3638 goto nla_put_failure;
3639
3640 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3641 goto nla_put_failure;
3642 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3643 goto nla_put_failure;
3644 if (set->flags & NFT_SET_MAP) {
3645 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3646 goto nla_put_failure;
3647 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3648 goto nla_put_failure;
3649 }
8aeff920
PNA		 3650 if (set->flags & NFT_SET_OBJECT &&
3651 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3652 goto nla_put_failure;
20a69341 3653
761da293 3654 if (set->timeout &&
d3e2a111 3655 nla_put_be64(skb, NFTA_SET_TIMEOUT,
8e1102d5 3656 nf_jiffies64_to_msecs(set->timeout),
b46f6ded 3657 NFTA_SET_PAD))
761da293
PM		 3658 goto nla_put_failure;
3659 if (set->gc_int &&
3660 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3661 goto nla_put_failure;
3662
9363dc4b
AB		 3663 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3664 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3665 goto nla_put_failure;
3666 }
3667
e6d8ecac
CFG		 3668 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3669 goto nla_put_failure;
3670
65038428
PNA		 3671 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3672 if (!nest)
c50b960c
PM		 3673 goto nla_put_failure;
3674 if (set->size &&
3675 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3676 goto nla_put_failure;
f3a2181e
SB		 3677
3678 if (set->field_count > 1 &&
3679 nf_tables_fill_set_concat(skb, set))
3680 goto nla_put_failure;
3681
65038428
PNA		 3682 nla_nest_end(skb, nest);
3683
3684 if (set->expr) {
3685 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3686 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3687 goto nla_put_failure;
3688
3689 nla_nest_end(skb, nest);
3690 }
c50b960c 3691
053c095a
JB		 3692 nlmsg_end(skb, nlh);
3693 return 0;
20a69341
PM		 3694
3695nla_put_failure:
3696 nlmsg_trim(skb, nlh);
3697 return -1;
3698}
3699
25e94a99
PNA		 3700static void nf_tables_set_notify(const struct nft_ctx *ctx,
3701 const struct nft_set *set, int event,
3702 gfp_t gfp_flags)
20a69341
PM		 3703{
3704 struct sk_buff *skb;
128ad332 3705 u32 portid = ctx->portid;
20a69341
PM		 3706 int err;
3707
128ad332
PNA		 3708 if (!ctx->report &&
3709 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
25e94a99 3710 return;
20a69341 3711
31f8441c 3712 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
20a69341
PM		 3713 if (skb == NULL)
3714 goto err;
3715
3716 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3717 if (err < 0) {
3718 kfree_skb(skb);
3719 goto err;
3720 }
3721
25e94a99
PNA		 3722 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3723 gfp_flags);
3724 return;
20a69341 3725err:
25e94a99 3726 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
20a69341
PM		 3727}
3728
5b96af77 3729static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
c9c8e485
PNA		 3730{
3731 const struct nft_set *set;
3732 unsigned int idx, s_idx = cb->args[0];
c9c8e485
PNA		 3733 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3734 struct net *net = sock_net(skb->sk);
5b96af77 3735 struct nft_ctx *ctx = cb->data, ctx_set;
c9c8e485
PNA		 3736
3737 if (cb->args[1])
3738 return skb->len;
3739
e688a7f8 3740 rcu_read_lock();
38e029f1
PNA		 3741 cb->seq = net->nft.base_seq;
3742
36596dad
PNA		 3743 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3744 if (ctx->family != NFPROTO_UNSPEC &&
98319cb9 3745 ctx->family != table->family)
36596dad
PNA		 3746 continue;
3747
3748 if (ctx->table && ctx->table != table)
5b96af77
PNA		 3749 continue;
3750
36596dad
PNA		 3751 if (cur_table) {
3752 if (cur_table != table)
c9c8e485
PNA		 3753 continue;
3754
36596dad 3755 cur_table = NULL;
c9c8e485 3756 }
36596dad
PNA		 3757 idx = 0;
3758 list_for_each_entry_rcu(set, &table->sets, list) {
3759 if (idx < s_idx)
3760 goto cont;
3761 if (!nft_is_active(net, set))
3762 goto cont;
5b96af77 3763
36596dad
PNA		 3764 ctx_set = *ctx;
3765 ctx_set.table = table;
98319cb9 3766 ctx_set.family = table->family;
c9c8e485 3767
36596dad
PNA		 3768 if (nf_tables_fill_set(skb, &ctx_set, set,
3769 NFT_MSG_NEWSET,
3770 NLM_F_MULTI) < 0) {
3771 cb->args[0] = idx;
3772 cb->args[2] = (unsigned long) table;
3773 goto done;
c9c8e485 3774 }
36596dad 3775 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
c9c8e485 3776cont:
36596dad 3777 idx++;
c9c8e485 3778 }
36596dad
PNA		 3779 if (s_idx)
3780 s_idx = 0;
c9c8e485
PNA		 3781 }
3782 cb->args[1] = 1;
3783done:
e688a7f8 3784 rcu_read_unlock();
c9c8e485
PNA		 3785 return skb->len;
3786}
3787
90fd131a
FW		 3788static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3789{
3790 struct nft_ctx *ctx_dump = NULL;
3791
3792 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3793 if (ctx_dump == NULL)
3794 return -ENOMEM;
3795
3796 cb->data = ctx_dump;
3797 return 0;
3798}
3799
5b96af77 3800static int nf_tables_dump_sets_done(struct netlink_callback *cb)
20a69341 3801{
5b96af77
PNA		 3802 kfree(cb->data);
3803 return 0;
20a69341
PM		 3804}
3805
d9adf22a 3806/* called with rcu_read_lock held */
7b8002a1
PNA		 3807static int nf_tables_getset(struct net *net, struct sock *nlsk,
3808 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3809 const struct nlattr * const nla[],
3810 struct netlink_ext_ack *extack)
20a69341 3811{
f2a6d766 3812 u8 genmask = nft_genmask_cur(net);
20a69341
PM		 3813 const struct nft_set *set;
3814 struct nft_ctx ctx;
3815 struct sk_buff *skb2;
c9c8e485 3816 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
20a69341
PM		 3817 int err;
3818
01cfa0a4 3819 /* Verify existence before starting dump */
36dd1bcc
PNA		 3820 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3821 genmask);
20a69341
PM		 3822 if (err < 0)
3823 return err;
3824
3825 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3826 struct netlink_dump_control c = {
90fd131a 3827 .start = nf_tables_dump_sets_start,
20a69341 3828 .dump = nf_tables_dump_sets,
5b96af77 3829 .done = nf_tables_dump_sets_done,
90fd131a 3830 .data = &ctx,
d9adf22a 3831 .module = THIS_MODULE,
20a69341 3832 };
5b96af77 3833
d9adf22a 3834 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
20a69341
PM		 3835 }
3836
c9c8e485
PNA		 3837 /* Only accept unspec with dump */
3838 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3839 return -EAFNOSUPPORT;
eaa2bcd6
PT		 3840 if (!nla[NFTA_SET_TABLE])
3841 return -EINVAL;
c9c8e485 3842
cac20fcd 3843 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
20a69341
PM		 3844 if (IS_ERR(set))
3845 return PTR_ERR(set);
3846
d9adf22a 3847 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
20a69341
PM		 3848 if (skb2 == NULL)
3849 return -ENOMEM;
3850
3851 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3852 if (err < 0)
3853 goto err;
3854
3855 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3856
3857err:
3858 kfree_skb(skb2);
3859 return err;
3860}
3861
f3a2181e
SB		 3862static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
3863 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
3864};
3865
3866static int nft_set_desc_concat_parse(const struct nlattr *attr,
3867 struct nft_set_desc *desc)
3868{
3869 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
3870 u32 len;
3871 int err;
3872
3873 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
3874 nft_concat_policy, NULL);
3875 if (err < 0)
3876 return err;
3877
3878 if (!tb[NFTA_SET_FIELD_LEN])
3879 return -EINVAL;
3880
3881 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
3882
3883 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
3884 return -E2BIG;
3885
3886 desc->field_len[desc->field_count++] = len;
3887
3888 return 0;
3889}
3890
3891static int nft_set_desc_concat(struct nft_set_desc *desc,
3892 const struct nlattr *nla)
3893{
3894 struct nlattr *attr;
3895 int rem, err;
3896
3897 nla_for_each_nested(attr, nla, rem) {
3898 if (nla_type(attr) != NFTA_LIST_ELEM)
3899 return -EINVAL;
3900
3901 err = nft_set_desc_concat_parse(attr, desc);
3902 if (err < 0)
3903 return err;
3904 }
3905
3906 return 0;
3907}
3908
f7e840ee 3909static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
c50b960c
PM		 3910 const struct nlattr *nla)
3911{
3912 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3913 int err;
3914
8cb08174
JB		 3915 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
3916 nft_set_desc_policy, NULL);
c50b960c
PM		 3917 if (err < 0)
3918 return err;
3919
3920 if (da[NFTA_SET_DESC_SIZE] != NULL)
3921 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
f3a2181e
SB		 3922 if (da[NFTA_SET_DESC_CONCAT])
3923 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
c50b960c 3924
f3a2181e 3925 return err;
c50b960c
PM		 3926}
3927
633c9a84
PNA		 3928static int nf_tables_newset(struct net *net, struct sock *nlsk,
3929 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 3930 const struct nlattr * const nla[],
3931 struct netlink_ext_ack *extack)
20a69341
PM		 3932{
3933 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 3934 u8 genmask = nft_genmask_next(net);
98319cb9 3935 int family = nfmsg->nfgen_family;
20a69341 3936 const struct nft_set_ops *ops;
65038428 3937 struct nft_expr *expr = NULL;
20a69341
PM		 3938 struct nft_table *table;
3939 struct nft_set *set;
3940 struct nft_ctx ctx;
38745490 3941 char *name;
4ef360dd 3942 u64 size;
761da293 3943 u64 timeout;
8aeff920 3944 u32 ktype, dtype, flags, policy, gc_int, objtype;
c50b960c 3945 struct nft_set_desc desc;
e6d8ecac
CFG		 3946 unsigned char *udata;
3947 u16 udlen;
20a69341 3948 int err;
f3a2181e 3949 int i;
20a69341
PM		 3950
3951 if (nla[NFTA_SET_TABLE] == NULL ||
3952 nla[NFTA_SET_NAME] == NULL ||
958bee14
PNA		 3953 nla[NFTA_SET_KEY_LEN] == NULL ||
3954 nla[NFTA_SET_ID] == NULL)
20a69341
PM		 3955 return -EINVAL;
3956
c50b960c
PM		 3957 memset(&desc, 0, sizeof(desc));
3958
20a69341
PM		 3959 ktype = NFT_DATA_VALUE;
3960 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3961 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3962 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3963 return -EINVAL;
3964 }
3965
c50b960c 3966 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
7d740264 3967 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 3968 return -EINVAL;
3969
3970 flags = 0;
3971 if (nla[NFTA_SET_FLAGS] != NULL) {
3972 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3973 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
7c6c6e95 3974 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
8aeff920 3975 NFT_SET_MAP | NFT_SET_EVAL |
ef516e86 3976 NFT_SET_OBJECT | NFT_SET_CONCAT))
d9583cdf 3977 return -EOPNOTSUPP;
8aeff920 3978 /* Only one of these operations is supported */
acab7131
FW		 3979 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
3980 (NFT_SET_MAP | NFT_SET_OBJECT))
3981 return -EOPNOTSUPP;
3982 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3983 (NFT_SET_EVAL | NFT_SET_OBJECT))
7c6c6e95 3984 return -EOPNOTSUPP;
20a69341
PM		 3985 }
3986
3987 dtype = 0;
20a69341
PM		 3988 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3989 if (!(flags & NFT_SET_MAP))
3990 return -EINVAL;
3991
3992 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3993 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3994 dtype != NFT_DATA_VERDICT)
3995 return -EINVAL;
3996
3997 if (dtype != NFT_DATA_VERDICT) {
3998 if (nla[NFTA_SET_DATA_LEN] == NULL)
3999 return -EINVAL;
c50b960c 4000 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
7d740264 4001 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
20a69341
PM		 4002 return -EINVAL;
4003 } else
7d740264 4004 desc.dlen = sizeof(struct nft_verdict);
20a69341
PM		 4005 } else if (flags & NFT_SET_MAP)
4006 return -EINVAL;
4007
8aeff920
PNA		 4008 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4009 if (!(flags & NFT_SET_OBJECT))
4010 return -EINVAL;
4011
4012 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4013 if (objtype == NFT_OBJECT_UNSPEC ||
4014 objtype > NFT_OBJECT_MAX)
d9583cdf 4015 return -EOPNOTSUPP;
8aeff920
PNA		 4016 } else if (flags & NFT_SET_OBJECT)
4017 return -EINVAL;
4018 else
4019 objtype = NFT_OBJECT_UNSPEC;
4020
761da293
PM		 4021 timeout = 0;
4022 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4023 if (!(flags & NFT_SET_TIMEOUT))
4024 return -EINVAL;
8e1102d5
FW		 4025
4026 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4027 if (err)
4028 return err;
761da293
PM		 4029 }
4030 gc_int = 0;
4031 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4032 if (!(flags & NFT_SET_TIMEOUT))
4033 return -EINVAL;
4034 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4035 }
4036
c50b960c
PM		 4037 policy = NFT_SET_POL_PERFORMANCE;
4038 if (nla[NFTA_SET_POLICY] != NULL)
4039 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4040
4041 if (nla[NFTA_SET_DESC] != NULL) {
f7e840ee 4042 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
c50b960c
PM		 4043 if (err < 0)
4044 return err;
4045 }
4046
d56aab26
PNA		 4047 if (nla[NFTA_SET_EXPR])
4048 desc.expr = true;
4049
cac20fcd 4050 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
36dd1bcc
PNA		 4051 if (IS_ERR(table)) {
4052 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
20a69341 4053 return PTR_ERR(table);
36dd1bcc 4054 }
20a69341 4055
98319cb9 4056 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
20a69341 4057
cac20fcd 4058 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
20a69341 4059 if (IS_ERR(set)) {
36dd1bcc
PNA		 4060 if (PTR_ERR(set) != -ENOENT) {
4061 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4062 return PTR_ERR(set);
36dd1bcc 4063 }
1a28ad74 4064 } else {
36dd1bcc
PNA		 4065 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4066 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
20a69341 4067 return -EEXIST;
36dd1bcc 4068 }
20a69341
PM		 4069 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4070 return -EOPNOTSUPP;
36dd1bcc 4071
20a69341
PM		 4072 return 0;
4073 }
4074
4075 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4076 return -ENOENT;
4077
2b664957 4078 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
20a69341
PM		 4079 if (IS_ERR(ops))
4080 return PTR_ERR(ops);
4081
e6d8ecac
CFG		 4082 udlen = 0;
4083 if (nla[NFTA_SET_USERDATA])
4084 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4085
20a69341
PM		 4086 size = 0;
4087 if (ops->privsize != NULL)
347b408d 4088 size = ops->privsize(nla, &desc);
20a69341 4089
1ff75a3e 4090 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
24d19826
FW		 4091 if (!set)
4092 return -ENOMEM;
20a69341 4093
38745490
PS		 4094 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4095 if (!name) {
4096 err = -ENOMEM;
65038428 4097 goto err_set_name;
38745490
PS		 4098 }
4099
20a69341 4100 err = nf_tables_set_alloc_name(&ctx, set, name);
38745490 4101 kfree(name);
20a69341 4102 if (err < 0)
65038428
PNA		 4103 goto err_set_alloc_name;
4104
4105 if (nla[NFTA_SET_EXPR]) {
4106 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4107 if (IS_ERR(expr)) {
4108 err = PTR_ERR(expr);
4109 goto err_set_alloc_name;
4110 }
4111 }
20a69341 4112
e6d8ecac
CFG		 4113 udata = NULL;
4114 if (udlen) {
4115 udata = set->data + size;
4116 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4117 }
4118
20a69341 4119 INIT_LIST_HEAD(&set->bindings);
3453c927
PNA		 4120 set->table = table;
4121 write_pnet(&set->net, net);
20a69341
PM		 4122 set->ops = ops;
4123 set->ktype = ktype;
c50b960c 4124 set->klen = desc.klen;
20a69341 4125 set->dtype = dtype;
8aeff920 4126 set->objtype = objtype;
c50b960c 4127 set->dlen = desc.dlen;
65038428 4128 set->expr = expr;
20a69341 4129 set->flags = flags;
c50b960c 4130 set->size = desc.size;
9363dc4b 4131 set->policy = policy;
e6d8ecac
CFG		 4132 set->udlen = udlen;
4133 set->udata = udata;
761da293
PM		 4134 set->timeout = timeout;
4135 set->gc_int = gc_int;
3ecbfd65 4136 set->handle = nf_tables_alloc_handle(table);
20a69341 4137
f3a2181e
SB		 4138 set->field_count = desc.field_count;
4139 for (i = 0; i < desc.field_count; i++)
4140 set->field_len[i] = desc.field_len[i];
4141
c50b960c 4142 err = ops->init(set, &desc, nla);
20a69341 4143 if (err < 0)
65038428 4144 goto err_set_init;
20a69341 4145
958bee14 4146 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
20a69341 4147 if (err < 0)
65038428 4148 goto err_set_trans;
20a69341 4149
e688a7f8 4150 list_add_tail_rcu(&set->list, &table->sets);
4fefee57 4151 table->use++;
20a69341
PM		 4152 return 0;
4153
65038428 4154err_set_trans:
c17c3cdf 4155 ops->destroy(set);
65038428
PNA		 4156err_set_init:
4157 if (expr)
4158 nft_expr_destroy(&ctx, expr);
4159err_set_alloc_name:
2f6adf48 4160 kfree(set->name);
65038428 4161err_set_name:
1ff75a3e 4162 kvfree(set);
20a69341
PM		 4163 return err;
4164}
4165
0c2a85ed 4166static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
20a69341 4167{
273fe3f1
PNA		 4168 if (WARN_ON(set->use > 0))
4169 return;
4170
65038428
PNA		 4171 if (set->expr)
4172 nft_expr_destroy(ctx, set->expr);
4173
20a69341 4174 set->ops->destroy(set);
38745490 4175 kfree(set->name);
1ff75a3e 4176 kvfree(set);
20a69341
PM		 4177}
4178
633c9a84
PNA		 4179static int nf_tables_delset(struct net *net, struct sock *nlsk,
4180 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 4181 const struct nlattr * const nla[],
4182 struct netlink_ext_ack *extack)
20a69341 4183{
c9c8e485 4184 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
f2a6d766 4185 u8 genmask = nft_genmask_next(net);
36dd1bcc 4186 const struct nlattr *attr;
20a69341
PM		 4187 struct nft_set *set;
4188 struct nft_ctx ctx;
4189 int err;
4190
ec2c9935
PM		 4191 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4192 return -EAFNOSUPPORT;
20a69341
PM		 4193 if (nla[NFTA_SET_TABLE] == NULL)
4194 return -EINVAL;
4195
36dd1bcc
PNA		 4196 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4197 genmask);
20a69341
PM		 4198 if (err < 0)
4199 return err;
4200
36dd1bcc
PNA		 4201 if (nla[NFTA_SET_HANDLE]) {
4202 attr = nla[NFTA_SET_HANDLE];
4203 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4204 } else {
4205 attr = nla[NFTA_SET_NAME];
4206 set = nft_set_lookup(ctx.table, attr, genmask);
4207 }
a8278400 4208
36dd1bcc
PNA		 4209 if (IS_ERR(set)) {
4210 NL_SET_BAD_ATTR(extack, attr);
4211 return PTR_ERR(set);
4212 }
273fe3f1 4213 if (set->use ||
36dd1bcc
PNA		 4214 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4215 NL_SET_BAD_ATTR(extack, attr);
20a69341 4216 return -EBUSY;
36dd1bcc 4217 }
20a69341 4218
ee01d542 4219 return nft_delset(&ctx, set);
20a69341
PM		 4220}
4221
4222static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
de70185d 4223 struct nft_set *set,
20a69341 4224 const struct nft_set_iter *iter,
de70185d 4225 struct nft_set_elem *elem)
20a69341 4226{
fe2811eb 4227 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4228 enum nft_registers dreg;
4229
4230 dreg = nft_type_to_reg(set->dtype);
1ec10212
PM		 4231 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4232 set->dtype == NFT_DATA_VERDICT ?
4233 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4234 set->dlen);
20a69341
PM		 4235}
4236
4237int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4238 struct nft_set_binding *binding)
4239{
4240 struct nft_set_binding *i;
4241 struct nft_set_iter iter;
4242
273fe3f1
PNA		 4243 if (set->use == UINT_MAX)
4244 return -EOVERFLOW;
4245
408070d6 4246 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
20a69341
PM		 4247 return -EBUSY;
4248
11113e19 4249 if (binding->flags & NFT_SET_MAP) {
20a69341
PM		 4250 /* If the set is already bound to the same chain all
4251 * jumps are already validated for that chain.
4252 */
4253 list_for_each_entry(i, &set->bindings, list) {
a4684402 4254 if (i->flags & NFT_SET_MAP &&
11113e19 4255 i->chain == binding->chain)
20a69341
PM		 4256 goto bind;
4257 }
4258
8588ac09 4259 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 4260 iter.skip = 0;
4261 iter.count = 0;
4262 iter.err = 0;
4263 iter.fn = nf_tables_bind_check_setelem;
4264
4265 set->ops->walk(ctx, set, &iter);
a02f4248 4266 if (iter.err < 0)
20a69341 4267 return iter.err;
20a69341
PM		 4268 }
4269bind:
4270 binding->chain = ctx->chain;
e688a7f8 4271 list_add_tail_rcu(&binding->list, &set->bindings);
f6ac8585 4272 nft_set_trans_bind(ctx, set);
273fe3f1 4273 set->use++;
f6ac8585 4274
20a69341
PM		 4275 return 0;
4276}
63aea290 4277EXPORT_SYMBOL_GPL(nf_tables_bind_set);
20a69341 4278
3b0a081d
FW		 4279static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4280 struct nft_set_binding *binding, bool event)
20a69341 4281{
e688a7f8 4282 list_del_rcu(&binding->list);
20a69341 4283
f6ac8585 4284 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
cd5125d8 4285 list_del_rcu(&set->list);
f6ac8585
PNA		 4286 if (event)
4287 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4288 GFP_KERNEL);
4289 }
20a69341
PM		 4290}
4291
273fe3f1
PNA		 4292void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4293 struct nft_set_binding *binding,
4294 enum nft_trans_phase phase)
4295{
4296 switch (phase) {
4297 case NFT_TRANS_PREPARE:
4298 set->use--;
4299 return;
4300 case NFT_TRANS_ABORT:
4301 case NFT_TRANS_RELEASE:
4302 set->use--;
4303 /* fall through */
4304 default:
4305 nf_tables_unbind_set(ctx, set, binding,
4306 phase == NFT_TRANS_COMMIT);
4307 }
4308}
4309EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4310
cd5125d8
FW		 4311void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4312{
f6ac8585 4313 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
0c2a85ed 4314 nft_set_destroy(ctx, set);
cd5125d8
FW		 4315}
4316EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4317
3ac4c07a
PM		 4318const struct nft_set_ext_type nft_set_ext_types[] = {
4319 [NFT_SET_EXT_KEY] = {
7d740264 4320 .align = __alignof__(u32),
3ac4c07a
PM		 4321 },
4322 [NFT_SET_EXT_DATA] = {
7d740264 4323 .align = __alignof__(u32),
3ac4c07a 4324 },
f25ad2e9
PM		 4325 [NFT_SET_EXT_EXPR] = {
4326 .align = __alignof__(struct nft_expr),
4327 },
8aeff920
PNA		 4328 [NFT_SET_EXT_OBJREF] = {
4329 .len = sizeof(struct nft_object *),
4330 .align = __alignof__(struct nft_object *),
4331 },
3ac4c07a
PM		 4332 [NFT_SET_EXT_FLAGS] = {
4333 .len = sizeof(u8),
4334 .align = __alignof__(u8),
4335 },
c3e1b005
PM		 4336 [NFT_SET_EXT_TIMEOUT] = {
4337 .len = sizeof(u64),
4338 .align = __alignof__(u64),
4339 },
4340 [NFT_SET_EXT_EXPIRATION] = {
8e1102d5
FW		 4341 .len = sizeof(u64),
4342 .align = __alignof__(u64),
c3e1b005 4343 },
68e942e8
PM		 4344 [NFT_SET_EXT_USERDATA] = {
4345 .len = sizeof(struct nft_userdata),
4346 .align = __alignof__(struct nft_userdata),
4347 },
7b225d0b
PNA		 4348 [NFT_SET_EXT_KEY_END] = {
4349 .align = __alignof__(u32),
4350 },
3ac4c07a 4351};
3ac4c07a 4352
20a69341
PM		 4353/*
4354 * Set elements
4355 */
4356
4357static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4358 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4359 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4360 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
c3e1b005 4361 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
79ebb5bb 4362 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
68e942e8
PM		 4363 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4364 .len = NFT_USERDATA_MAXLEN },
467697d2 4365 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
9332d27d
FW		 4366 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4367 .len = NFT_OBJ_MAXNAMELEN - 1 },
7b225d0b 4368 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
20a69341
PM		 4369};
4370
4371static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
b2fbd044
LZ		 4372 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4373 .len = NFT_TABLE_MAXNAMELEN - 1 },
4374 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4375 .len = NFT_SET_MAXNAMELEN - 1 },
20a69341 4376 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
958bee14 4377 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
20a69341
PM		 4378};
4379
633c9a84 4380static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
20a69341
PM		 4381 const struct sk_buff *skb,
4382 const struct nlmsghdr *nlh,
f2a6d766 4383 const struct nlattr * const nla[],
36dd1bcc 4384 struct netlink_ext_ack *extack,
f2a6d766 4385 u8 genmask)
20a69341
PM		 4386{
4387 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
98319cb9 4388 int family = nfmsg->nfgen_family;
7c95f6d8 4389 struct nft_table *table;
20a69341 4390
cac20fcd
PNA		 4391 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4392 genmask);
36dd1bcc
PNA		 4393 if (IS_ERR(table)) {
4394 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
20a69341 4395 return PTR_ERR(table);
36dd1bcc 4396 }
20a69341 4397
98319cb9 4398 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
20a69341
PM		 4399 return 0;
4400}
4401
4402static int nf_tables_fill_setelem(struct sk_buff *skb,
4403 const struct nft_set *set,
4404 const struct nft_set_elem *elem)
4405{
fe2811eb 4406 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
20a69341
PM		 4407 unsigned char *b = skb_tail_pointer(skb);
4408 struct nlattr *nest;
4409
ae0be8de 4410 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
20a69341
PM		 4411 if (nest == NULL)
4412 goto nla_put_failure;
4413
fe2811eb
PM		 4414 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4415 NFT_DATA_VALUE, set->klen) < 0)
20a69341
PM		 4416 goto nla_put_failure;
4417
7b225d0b
PNA		 4418 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4419 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4420 NFT_DATA_VALUE, set->klen) < 0)
4421 goto nla_put_failure;
4422
fe2811eb
PM		 4423 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4424 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
20a69341
PM		 4425 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4426 set->dlen) < 0)
4427 goto nla_put_failure;
4428
f25ad2e9
PM		 4429 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4430 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4431 goto nla_put_failure;
4432
8aeff920
PNA		 4433 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4434 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
d152159b 4435 (*nft_set_ext_obj(ext))->key.name) < 0)
8aeff920
PNA		 4436 goto nla_put_failure;
4437
fe2811eb
PM		 4438 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4439 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4440 htonl(*nft_set_ext_flags(ext))))
4441 goto nla_put_failure;
20a69341 4442
c3e1b005
PM		 4443 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4444 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
8e1102d5 4445 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
b46f6ded 4446 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4447 goto nla_put_failure;
4448
4449 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
8e1102d5 4450 u64 expires, now = get_jiffies_64();
c3e1b005
PM		 4451
4452 expires = *nft_set_ext_expiration(ext);
8e1102d5 4453 if (time_before64(now, expires))
c3e1b005
PM		 4454 expires -= now;
4455 else
4456 expires = 0;
4457
4458 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
8e1102d5 4459 nf_jiffies64_to_msecs(expires),
b46f6ded 4460 NFTA_SET_ELEM_PAD))
c3e1b005
PM		 4461 goto nla_put_failure;
4462 }
4463
68e942e8
PM		 4464 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4465 struct nft_userdata *udata;
4466
4467 udata = nft_set_ext_userdata(ext);
4468 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4469 udata->len + 1, udata->data))
4470 goto nla_put_failure;
4471 }
4472
20a69341
PM		 4473 nla_nest_end(skb, nest);
4474 return 0;
4475
4476nla_put_failure:
4477 nlmsg_trim(skb, b);
4478 return -EMSGSIZE;
4479}
4480
4481struct nft_set_dump_args {
4482 const struct netlink_callback *cb;
4483 struct nft_set_iter iter;
4484 struct sk_buff *skb;
4485};
4486
4487static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
de70185d 4488 struct nft_set *set,
20a69341 4489 const struct nft_set_iter *iter,
de70185d 4490 struct nft_set_elem *elem)
20a69341
PM		 4491{
4492 struct nft_set_dump_args *args;
4493
4494 args = container_of(iter, struct nft_set_dump_args, iter);
4495 return nf_tables_fill_setelem(args->skb, set, elem);
4496}
4497
fa803605
LZ		 4498struct nft_set_dump_ctx {
4499 const struct nft_set *set;
4500 struct nft_ctx ctx;
4501};
4502
20a69341
PM		 4503static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4504{
fa803605 4505 struct nft_set_dump_ctx *dump_ctx = cb->data;
633c9a84 4506 struct net *net = sock_net(skb->sk);
fa803605 4507 struct nft_table *table;
de70185d 4508 struct nft_set *set;
20a69341 4509 struct nft_set_dump_args args;
fa803605 4510 bool set_found = false;
20a69341
PM		 4511 struct nfgenmsg *nfmsg;
4512 struct nlmsghdr *nlh;
4513 struct nlattr *nest;
4514 u32 portid, seq;
fa803605 4515 int event;
20a69341 4516
fa803605 4517 rcu_read_lock();
36596dad
PNA		 4518 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4519 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
98319cb9 4520 dump_ctx->ctx.family != table->family)
fa803605 4521 continue;
20a69341 4522
36596dad
PNA		 4523 if (table != dump_ctx->ctx.table)
4524 continue;
20a69341 4525
36596dad
PNA		 4526 list_for_each_entry_rcu(set, &table->sets, list) {
4527 if (set == dump_ctx->set) {
4528 set_found = true;
4529 break;
fa803605 4530 }
fa803605
LZ		 4531 }
4532 break;
4533 }
4534
4535 if (!set_found) {
4536 rcu_read_unlock();
4537 return -ENOENT;
4538 }
20a69341 4539
dedb67c4 4540 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
20a69341
PM		 4541 portid = NETLINK_CB(cb->skb).portid;
4542 seq = cb->nlh->nlmsg_seq;
4543
4544 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4545 NLM_F_MULTI);
4546 if (nlh == NULL)
4547 goto nla_put_failure;
4548
4549 nfmsg = nlmsg_data(nlh);
98319cb9 4550 nfmsg->nfgen_family = table->family;
20a69341 4551 nfmsg->version = NFNETLINK_V0;
fa803605 4552 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
20a69341 4553
fa803605 4554 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
20a69341
PM		 4555 goto nla_put_failure;
4556 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4557 goto nla_put_failure;
4558
ae0be8de 4559 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
20a69341
PM		 4560 if (nest == NULL)
4561 goto nla_put_failure;
4562
8588ac09
PNA		 4563 args.cb = cb;
4564 args.skb = skb;
fa803605 4565 args.iter.genmask = nft_genmask_cur(net);
8588ac09
PNA		 4566 args.iter.skip = cb->args[0];
4567 args.iter.count = 0;
4568 args.iter.err = 0;
4569 args.iter.fn = nf_tables_dump_setelem;
fa803605
LZ		 4570 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4571 rcu_read_unlock();
20a69341
PM		 4572
4573 nla_nest_end(skb, nest);
4574 nlmsg_end(skb, nlh);
4575
4576 if (args.iter.err && args.iter.err != -EMSGSIZE)
4577 return args.iter.err;
4578 if (args.iter.count == cb->args[0])
4579 return 0;
4580
4581 cb->args[0] = args.iter.count;
4582 return skb->len;
4583
4584nla_put_failure:
fa803605 4585 rcu_read_unlock();
20a69341
PM		 4586 return -ENOSPC;
4587}
4588
90fd131a
FW		 4589static int nf_tables_dump_set_start(struct netlink_callback *cb)
4590{
4591 struct nft_set_dump_ctx *dump_ctx = cb->data;
4592
4593 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4594
4595 return cb->data ? 0 : -ENOMEM;
4596}
4597
fa803605
LZ		 4598static int nf_tables_dump_set_done(struct netlink_callback *cb)
4599{
4600 kfree(cb->data);
4601 return 0;
4602}
4603
d60ce62f
AB		 4604static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4605 const struct nft_ctx *ctx, u32 seq,
4606 u32 portid, int event, u16 flags,
4607 const struct nft_set *set,
4608 const struct nft_set_elem *elem)
4609{
4610 struct nfgenmsg *nfmsg;
4611 struct nlmsghdr *nlh;
4612 struct nlattr *nest;
4613 int err;
4614
dedb67c4 4615 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
d60ce62f
AB		 4616 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4617 flags);
4618 if (nlh == NULL)
4619 goto nla_put_failure;
4620
4621 nfmsg = nlmsg_data(nlh);
36596dad 4622 nfmsg->nfgen_family = ctx->family;
d60ce62f 4623 nfmsg->version = NFNETLINK_V0;
84d7fce6 4624 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
d60ce62f
AB		 4625
4626 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4627 goto nla_put_failure;
4628 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4629 goto nla_put_failure;
4630
ae0be8de 4631 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
d60ce62f
AB		 4632 if (nest == NULL)
4633 goto nla_put_failure;
4634
4635 err = nf_tables_fill_setelem(skb, set, elem);
4636 if (err < 0)
4637 goto nla_put_failure;
4638
4639 nla_nest_end(skb, nest);
4640
053c095a
JB		 4641 nlmsg_end(skb, nlh);
4642 return 0;
d60ce62f
AB		 4643
4644nla_put_failure:
4645 nlmsg_trim(skb, nlh);
4646 return -1;
4647}
4648
ba0e4d99
PNA		 4649static int nft_setelem_parse_flags(const struct nft_set *set,
4650 const struct nlattr *attr, u32 *flags)
4651{
4652 if (attr == NULL)
4653 return 0;
4654
4655 *flags = ntohl(nla_get_be32(attr));
4656 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4657 return -EINVAL;
4658 if (!(set->flags & NFT_SET_INTERVAL) &&
4659 *flags & NFT_SET_ELEM_INTERVAL_END)
4660 return -EINVAL;
4661
4662 return 0;
4663}
4664
20a1452c
PNA		 4665static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4666 struct nft_data *key, struct nlattr *attr)
4667{
4668 struct nft_data_desc desc;
4669 int err;
4670
4671 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4672 if (err < 0)
4673 return err;
4674
4675 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4676 nft_data_release(key, desc.type);
4677 return -EINVAL;
4678 }
4679
4680 return 0;
4681}
4682
fdb9c405
PNA		 4683static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4684 struct nft_data_desc *desc,
4685 struct nft_data *data,
4686 struct nlattr *attr)
4687{
4688 int err;
4689
4690 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4691 if (err < 0)
4692 return err;
4693
4694 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4695 nft_data_release(data, desc->type);
4696 return -EINVAL;
4697 }
4698
4699 return 0;
4700}
4701
ba0e4d99
PNA		 4702static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4703 const struct nlattr *attr)
4704{
4705 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
ba0e4d99
PNA		 4706 struct nft_set_elem elem;
4707 struct sk_buff *skb;
4708 uint32_t flags = 0;
4709 void *priv;
4710 int err;
4711
8cb08174
JB		 4712 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4713 nft_set_elem_policy, NULL);
ba0e4d99
PNA		 4714 if (err < 0)
4715 return err;
4716
4717 if (!nla[NFTA_SET_ELEM_KEY])
4718 return -EINVAL;
4719
4720 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4721 if (err < 0)
4722 return err;
4723
20a1452c
PNA		 4724 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4725 nla[NFTA_SET_ELEM_KEY]);
ba0e4d99
PNA		 4726 if (err < 0)
4727 return err;
4728
7b225d0b
PNA		 4729 if (nla[NFTA_SET_ELEM_KEY_END]) {
4730 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4731 nla[NFTA_SET_ELEM_KEY_END]);
4732 if (err < 0)
4733 return err;
4734 }
4735
ba0e4d99
PNA		 4736 priv = set->ops->get(ctx->net, set, &elem, flags);
4737 if (IS_ERR(priv))
4738 return PTR_ERR(priv);
4739
4740 elem.priv = priv;
ba0e4d99
PNA		 4741
4742 err = -ENOMEM;
d9adf22a 4743 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
ba0e4d99
PNA		 4744 if (skb == NULL)
4745 goto err1;
4746
4747 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4748 NFT_MSG_NEWSETELEM, 0, set, &elem);
4749 if (err < 0)
4750 goto err2;
4751
4752 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
4753 /* This avoids a loop in nfnetlink. */
4754 if (err < 0)
4755 goto err1;
4756
4757 return 0;
4758err2:
4759 kfree_skb(skb);
4760err1:
4761 /* this avoids a loop in nfnetlink. */
4762 return err == -EAGAIN ? -ENOBUFS : err;
4763}
4764
d9adf22a 4765/* called with rcu_read_lock held */
ba0e4d99
PNA		 4766static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4767 struct sk_buff *skb, const struct nlmsghdr *nlh,
4768 const struct nlattr * const nla[],
4769 struct netlink_ext_ack *extack)
4770{
4771 u8 genmask = nft_genmask_cur(net);
4772 struct nft_set *set;
4773 struct nlattr *attr;
4774 struct nft_ctx ctx;
4775 int rem, err = 0;
4776
36dd1bcc
PNA		 4777 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4778 genmask);
ba0e4d99
PNA		 4779 if (err < 0)
4780 return err;
4781
cac20fcd 4782 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
ba0e4d99
PNA		 4783 if (IS_ERR(set))
4784 return PTR_ERR(set);
4785
4786 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4787 struct netlink_dump_control c = {
90fd131a 4788 .start = nf_tables_dump_set_start,
ba0e4d99
PNA		 4789 .dump = nf_tables_dump_set,
4790 .done = nf_tables_dump_set_done,
d9adf22a 4791 .module = THIS_MODULE,
ba0e4d99 4792 };
90fd131a
FW		 4793 struct nft_set_dump_ctx dump_ctx = {
4794 .set = set,
4795 .ctx = ctx,
4796 };
ba0e4d99 4797
90fd131a 4798 c.data = &dump_ctx;
d9adf22a 4799 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
ba0e4d99
PNA		 4800 }
4801
4802 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4803 return -EINVAL;
4804
4805 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4806 err = nft_get_set_elem(&ctx, set, attr);
4807 if (err < 0)
4808 break;
4809 }
4810
4811 return err;
4812}
4813
25e94a99
PNA		 4814static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4815 const struct nft_set *set,
4816 const struct nft_set_elem *elem,
4817 int event, u16 flags)
d60ce62f 4818{
128ad332
PNA		 4819 struct net *net = ctx->net;
4820 u32 portid = ctx->portid;
d60ce62f
AB		 4821 struct sk_buff *skb;
4822 int err;
4823
128ad332 4824 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 4825 return;
d60ce62f 4826
d60ce62f
AB		 4827 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4828 if (skb == NULL)
4829 goto err;
4830
4831 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4832 set, elem);
4833 if (err < 0) {
4834 kfree_skb(skb);
4835 goto err;
4836 }
4837
25e94a99
PNA		 4838 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4839 GFP_KERNEL);
4840 return;
d60ce62f 4841err:
25e94a99 4842 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
d60ce62f
AB		 4843}
4844
60319eb1
PNA		 4845static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4846 int msg_type,
4847 struct nft_set *set)
4848{
4849 struct nft_trans *trans;
4850
4851 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4852 if (trans == NULL)
4853 return NULL;
4854
4855 nft_trans_elem_set(trans) = set;
4856 return trans;
4857}
4858
a7fc9368
PNA		 4859struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
4860 const struct nft_set *set,
4861 const struct nlattr *attr)
4862{
4863 struct nft_expr *expr;
4864 int err;
4865
4866 expr = nft_expr_init(ctx, attr);
4867 if (IS_ERR(expr))
4868 return expr;
4869
4870 err = -EOPNOTSUPP;
4871 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
4872 goto err_set_elem_expr;
4873
4874 if (expr->ops->type->flags & NFT_EXPR_GC) {
4875 if (set->flags & NFT_SET_TIMEOUT)
4876 goto err_set_elem_expr;
4877 if (!set->ops->gc_init)
4878 goto err_set_elem_expr;
4879 set->ops->gc_init(set);
4880 }
4881
4882 return expr;
4883
4884err_set_elem_expr:
4885 nft_expr_destroy(ctx, expr);
4886 return ERR_PTR(err);
4887}
4888
22fe54d5
PM		 4889void *nft_set_elem_init(const struct nft_set *set,
4890 const struct nft_set_ext_tmpl *tmpl,
7b225d0b
PNA		 4891 const u32 *key, const u32 *key_end,
4892 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
fe2811eb
PM		 4893{
4894 struct nft_set_ext *ext;
4895 void *elem;
4896
4897 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
4898 if (elem == NULL)
4899 return NULL;
4900
4901 ext = nft_set_elem_ext(set, elem);
4902 nft_set_ext_init(ext, tmpl);
4903
4904 memcpy(nft_set_ext_key(ext), key, set->klen);
7b225d0b
PNA		 4905 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
4906 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
fe2811eb
PM		 4907 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4908 memcpy(nft_set_ext_data(ext), data, set->dlen);
79ebb5bb
LGL		 4909 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4910 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
4911 if (expiration == 0)
4912 *nft_set_ext_expiration(ext) += timeout;
4913 }
c3e1b005
PM		 4914 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
4915 *nft_set_ext_timeout(ext) = timeout;
fe2811eb
PM		 4916
4917 return elem;
4918}
4919
475beb9c
PNA		 4920static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
4921 struct nft_expr *expr)
4922{
4923 if (expr->ops->destroy_clone) {
4924 expr->ops->destroy_clone(ctx, expr);
4925 module_put(expr->ops->type->owner);
4926 } else {
4927 nf_tables_expr_destroy(ctx, expr);
4928 }
4929}
4930
61f9e292
LZ		 4931void nft_set_elem_destroy(const struct nft_set *set, void *elem,
4932 bool destroy_expr)
61edafbb
PM		 4933{
4934 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3453c927
PNA		 4935 struct nft_ctx ctx = {
4936 .net = read_pnet(&set->net),
4937 .family = set->table->family,
4938 };
61edafbb 4939
59105446 4940 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
61edafbb 4941 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
59105446 4942 nft_data_release(nft_set_ext_data(ext), set->dtype);
475beb9c
PNA		 4943 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
4944 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
371ebcbb 4945
8aeff920
PNA		 4946 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4947 (*nft_set_ext_obj(ext))->use--;
61edafbb
PM		 4948 kfree(elem);
4949}
4950EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
4951
59105446
PNA		 4952/* Only called from commit path, nft_set_elem_deactivate() already deals with
4953 * the refcounting from the preparation phase.
4954 */
3453c927
PNA		 4955static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
4956 const struct nft_set *set, void *elem)
59105446
PNA		 4957{
4958 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
4959
4960 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
475beb9c
PNA		 4961 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
4962
59105446
PNA		 4963 kfree(elem);
4964}
4965
60319eb1 4966static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
c016c7e4 4967 const struct nlattr *attr, u32 nlmsg_flags)
20a69341
PM		 4968{
4969 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
8aeff920 4970 u8 genmask = nft_genmask_next(ctx->net);
fe2811eb 4971 struct nft_set_ext_tmpl tmpl;
c016c7e4 4972 struct nft_set_ext *ext, *ext2;
20a69341
PM		 4973 struct nft_set_elem elem;
4974 struct nft_set_binding *binding;
8aeff920 4975 struct nft_object *obj = NULL;
40944452 4976 struct nft_expr *expr = NULL;
68e942e8 4977 struct nft_userdata *udata;
20a1452c 4978 struct nft_data_desc desc;
20a69341 4979 enum nft_registers dreg;
60319eb1 4980 struct nft_trans *trans;
0e9091d6 4981 u32 flags = 0;
c3e1b005 4982 u64 timeout;
79ebb5bb 4983 u64 expiration;
68e942e8 4984 u8 ulen;
20a69341
PM		 4985 int err;
4986
8cb08174
JB		 4987 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4988 nft_set_elem_policy, NULL);
20a69341
PM		 4989 if (err < 0)
4990 return err;
4991
4992 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4993 return -EINVAL;
4994
fe2811eb
PM		 4995 nft_set_ext_prepare(&tmpl);
4996
0e9091d6
PNA		 4997 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4998 if (err < 0)
4999 return err;
5000 if (flags != 0)
5001 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
20a69341
PM		 5002
5003 if (set->flags & NFT_SET_MAP) {
5004 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
fe2811eb 5005 !(flags & NFT_SET_ELEM_INTERVAL_END))
20a69341
PM		 5006 return -EINVAL;
5007 } else {
5008 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5009 return -EINVAL;
5010 }
5011
bffc124b
PNA		 5012 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5013 (nla[NFTA_SET_ELEM_DATA] ||
5014 nla[NFTA_SET_ELEM_OBJREF] ||
5015 nla[NFTA_SET_ELEM_TIMEOUT] ||
5016 nla[NFTA_SET_ELEM_EXPIRATION] ||
5017 nla[NFTA_SET_ELEM_USERDATA] ||
5018 nla[NFTA_SET_ELEM_EXPR]))
5019 return -EINVAL;
5020
c3e1b005
PM		 5021 timeout = 0;
5022 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5023 if (!(set->flags & NFT_SET_TIMEOUT))
5024 return -EINVAL;
8e1102d5
FW		 5025 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5026 &timeout);
5027 if (err)
5028 return err;
c3e1b005
PM		 5029 } else if (set->flags & NFT_SET_TIMEOUT) {
5030 timeout = set->timeout;
5031 }
5032
79ebb5bb
LGL		 5033 expiration = 0;
5034 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5035 if (!(set->flags & NFT_SET_TIMEOUT))
5036 return -EINVAL;
5037 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5038 &expiration);
5039 if (err)
5040 return err;
5041 }
5042
40944452
PNA		 5043 if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5044 expr = nft_set_elem_expr_alloc(ctx, set,
5045 nla[NFTA_SET_ELEM_EXPR]);
5046 if (IS_ERR(expr))
5047 return PTR_ERR(expr);
65038428
PNA		 5048
5049 err = -EOPNOTSUPP;
5050 if (set->expr && set->expr->ops != expr->ops)
5051 goto err_set_elem_expr;
5052 } else if (set->expr) {
5053 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5054 if (!expr)
5055 return -ENOMEM;
5056
5057 err = nft_expr_clone(expr, set->expr);
5058 if (err < 0)
5059 goto err_set_elem_expr;
40944452
PNA		 5060 }
5061
20a1452c
PNA		 5062 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5063 nla[NFTA_SET_ELEM_KEY]);
20a69341 5064 if (err < 0)
40944452 5065 goto err_set_elem_expr;
20a69341 5066
20a1452c 5067 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7b225d0b
PNA		 5068
5069 if (nla[NFTA_SET_ELEM_KEY_END]) {
5070 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5071 nla[NFTA_SET_ELEM_KEY_END]);
5072 if (err < 0)
5073 goto err_parse_key;
5074
5075 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5076 }
5077
c3e1b005
PM		 5078 if (timeout > 0) {
5079 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5080 if (timeout != set->timeout)
5081 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5082 }
fe2811eb 5083
40944452
PNA		 5084 if (expr)
5085 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5086 expr->ops->size);
5087
8aeff920
PNA		 5088 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5089 if (!(set->flags & NFT_SET_OBJECT)) {
5090 err = -EINVAL;
7b225d0b 5091 goto err_parse_key_end;
8aeff920 5092 }
4d44175a
FW		 5093 obj = nft_obj_lookup(ctx->net, ctx->table,
5094 nla[NFTA_SET_ELEM_OBJREF],
cac20fcd 5095 set->objtype, genmask);
8aeff920
PNA		 5096 if (IS_ERR(obj)) {
5097 err = PTR_ERR(obj);
7b225d0b 5098 goto err_parse_key_end;
8aeff920
PNA		 5099 }
5100 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5101 }
5102
20a69341 5103 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
fdb9c405
PNA		 5104 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5105 nla[NFTA_SET_ELEM_DATA]);
20a69341 5106 if (err < 0)
7b225d0b 5107 goto err_parse_key_end;
20a69341 5108
20a69341
PM		 5109 dreg = nft_type_to_reg(set->dtype);
5110 list_for_each_entry(binding, &set->bindings, list) {
5111 struct nft_ctx bind_ctx = {
58c78e10 5112 .net = ctx->net,
36596dad 5113 .family = ctx->family,
20a69341 5114 .table = ctx->table,
7c95f6d8 5115 .chain = (struct nft_chain *)binding->chain,
20a69341
PM		 5116 };
5117
11113e19
PM		 5118 if (!(binding->flags & NFT_SET_MAP))
5119 continue;
5120
1ec10212 5121 err = nft_validate_register_store(&bind_ctx, dreg,
fdb9c405 5122 &elem.data.val,
20a1452c 5123 desc.type, desc.len);
20a69341 5124 if (err < 0)
7b225d0b 5125 goto err_parse_data;
a654de8f 5126
20a1452c 5127 if (desc.type == NFT_DATA_VERDICT &&
fdb9c405
PNA		 5128 (elem.data.val.verdict.code == NFT_GOTO ||
5129 elem.data.val.verdict.code == NFT_JUMP))
a654de8f
PNA		 5130 nft_validate_state_update(ctx->net,
5131 NFT_VALIDATE_NEED);
20a69341 5132 }
fe2811eb 5133
20a1452c 5134 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
20a69341
PM		 5135 }
5136
68e942e8
PM		 5137 /* The full maximum length of userdata can exceed the maximum
5138 * offset value (U8_MAX) for following extensions, therefor it
5139 * must be the last extension added.
5140 */
5141 ulen = 0;
5142 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5143 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5144 if (ulen > 0)
5145 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5146 ulen);
5147 }
5148
fe2811eb 5149 err = -ENOMEM;
7b225d0b 5150 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
fdb9c405 5151 elem.key_end.val.data, elem.data.val.data,
79ebb5bb 5152 timeout, expiration, GFP_KERNEL);
fe2811eb 5153 if (elem.priv == NULL)
7b225d0b 5154 goto err_parse_data;
fe2811eb
PM		 5155
5156 ext = nft_set_elem_ext(set, elem.priv);
5157 if (flags)
5158 *nft_set_ext_flags(ext) = flags;
68e942e8
PM		 5159 if (ulen > 0) {
5160 udata = nft_set_ext_userdata(ext);
5161 udata->len = ulen - 1;
5162 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5163 }
8aeff920
PNA		 5164 if (obj) {
5165 *nft_set_ext_obj(ext) = obj;
5166 obj->use++;
5167 }
40944452
PNA		 5168 if (expr) {
5169 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5170 kfree(expr);
772f4e82 5171 expr = NULL;
40944452 5172 }
fe2811eb 5173
60319eb1
PNA		 5174 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5175 if (trans == NULL)
7b225d0b 5176 goto err_trans;
60319eb1 5177
69086658 5178 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
c016c7e4
PNA		 5179 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5180 if (err) {
5181 if (err == -EEXIST) {
9744a6fc
PNA		 5182 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5183 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5184 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
f0dfd7a2
CIK		 5185 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) {
5186 err = -EBUSY;
7b225d0b 5187 goto err_element_clash;
f0dfd7a2 5188 }
8aeff920
PNA		 5189 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5190 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5191 memcmp(nft_set_ext_data(ext),
5192 nft_set_ext_data(ext2), set->dlen) != 0) ||
5193 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5194 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5195 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
c016c7e4
PNA		 5196 err = -EBUSY;
5197 else if (!(nlmsg_flags & NLM_F_EXCL))
5198 err = 0;
8c2d45b2
PNA		 5199 } else if (err == -ENOTEMPTY) {
5200 /* ENOTEMPTY reports overlapping between this element
5201 * and an existing one.
5202 */
5203 err = -EEXIST;
c016c7e4 5204 }
7b225d0b 5205 goto err_element_clash;
c016c7e4 5206 }
20a69341 5207
35d0ac90
PNA		 5208 if (set->size &&
5209 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5210 err = -ENFILE;
7b225d0b 5211 goto err_set_full;
35d0ac90
PNA		 5212 }
5213
60319eb1 5214 nft_trans_elem(trans) = elem;
46bbafce 5215 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
20a69341
PM		 5216 return 0;
5217
7b225d0b 5218err_set_full:
5cb82a38 5219 set->ops->remove(ctx->net, set, &elem);
7b225d0b 5220err_element_clash:
60319eb1 5221 kfree(trans);
7b225d0b 5222err_trans:
b91d9036
TY		 5223 if (obj)
5224 obj->use--;
475beb9c
PNA		 5225
5226 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7b225d0b 5227err_parse_data:
20a69341 5228 if (nla[NFTA_SET_ELEM_DATA] != NULL)
fdb9c405 5229 nft_data_release(&elem.data.val, desc.type);
7b225d0b
PNA		 5230err_parse_key_end:
5231 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5232err_parse_key:
20a1452c 5233 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
40944452
PNA		 5234err_set_elem_expr:
5235 if (expr != NULL)
5236 nft_expr_destroy(ctx, expr);
7b225d0b 5237
20a69341
PM		 5238 return err;
5239}
5240
633c9a84
PNA		 5241static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5242 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5243 const struct nlattr * const nla[],
5244 struct netlink_ext_ack *extack)
20a69341 5245{
f2a6d766 5246 u8 genmask = nft_genmask_next(net);
20a69341
PM		 5247 const struct nlattr *attr;
5248 struct nft_set *set;
5249 struct nft_ctx ctx;
a654de8f 5250 int rem, err;
20a69341 5251
7d5570ca
PNA		 5252 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5253 return -EINVAL;
5254
36dd1bcc
PNA		 5255 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5256 genmask);
20a69341
PM		 5257 if (err < 0)
5258 return err;
5259
a3073c17
PNA		 5260 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5261 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5262 if (IS_ERR(set))
5263 return PTR_ERR(set);
958bee14 5264
20a69341
PM		 5265 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5266 return -EBUSY;
5267
5268 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
c016c7e4 5269 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
35d0ac90 5270 if (err < 0)
a654de8f 5271 return err;
20a69341 5272 }
a654de8f
PNA		 5273
5274 if (net->nft.validate_state == NFT_VALIDATE_DO)
5275 return nft_table_validate(net, ctx.table);
5276
5277 return 0;
20a69341
PM		 5278}
5279
59105446
PNA		 5280/**
5281 * nft_data_hold - hold a nft_data item
5282 *
5283 * @data: struct nft_data to release
5284 * @type: type of data
5285 *
5286 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5287 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5288 * NFT_GOTO verdicts. This function must be called on active data objects
5289 * from the second phase of the commit protocol.
5290 */
bb7b40ae 5291void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
59105446
PNA		 5292{
5293 if (type == NFT_DATA_VERDICT) {
5294 switch (data->verdict.code) {
5295 case NFT_JUMP:
5296 case NFT_GOTO:
5297 data->verdict.chain->use++;
5298 break;
5299 }
5300 }
5301}
5302
5303static void nft_set_elem_activate(const struct net *net,
5304 const struct nft_set *set,
5305 struct nft_set_elem *elem)
5306{
5307 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5308
5309 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5310 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5311 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5312 (*nft_set_ext_obj(ext))->use++;
5313}
5314
5315static void nft_set_elem_deactivate(const struct net *net,
5316 const struct nft_set *set,
5317 struct nft_set_elem *elem)
5318{
5319 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5320
5321 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5322 nft_data_release(nft_set_ext_data(ext), set->dtype);
5323 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5324 (*nft_set_ext_obj(ext))->use--;
5325}
5326
60319eb1 5327static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
20a69341
PM		 5328 const struct nlattr *attr)
5329{
5330 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3971ca14 5331 struct nft_set_ext_tmpl tmpl;
20a69341 5332 struct nft_set_elem elem;
3971ca14 5333 struct nft_set_ext *ext;
60319eb1 5334 struct nft_trans *trans;
3971ca14
PNA		 5335 u32 flags = 0;
5336 void *priv;
20a69341
PM		 5337 int err;
5338
8cb08174
JB		 5339 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5340 nft_set_elem_policy, NULL);
20a69341 5341 if (err < 0)
20a1452c 5342 return err;
20a69341 5343
20a69341 5344 if (nla[NFTA_SET_ELEM_KEY] == NULL)
20a1452c 5345 return -EINVAL;
20a69341 5346
3971ca14
PNA		 5347 nft_set_ext_prepare(&tmpl);
5348
5349 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5350 if (err < 0)
5351 return err;
5352 if (flags != 0)
5353 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5354
20a1452c
PNA		 5355 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5356 nla[NFTA_SET_ELEM_KEY]);
20a69341 5357 if (err < 0)
20a1452c 5358 return err;
20a69341 5359
20a1452c 5360 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
3971ca14 5361
7b225d0b
PNA		 5362 if (nla[NFTA_SET_ELEM_KEY_END]) {
5363 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5364 nla[NFTA_SET_ELEM_KEY_END]);
5365 if (err < 0)
5366 return err;
5367
5368 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5369 }
5370
3971ca14 5371 err = -ENOMEM;
7b225d0b
PNA		 5372 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5373 elem.key_end.val.data, NULL, 0, 0,
5374 GFP_KERNEL);
3971ca14 5375 if (elem.priv == NULL)
20a1452c 5376 goto fail_elem;
3971ca14
PNA		 5377
5378 ext = nft_set_elem_ext(set, elem.priv);
5379 if (flags)
5380 *nft_set_ext_flags(ext) = flags;
5381
60319eb1 5382 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
20a1452c
PNA		 5383 if (trans == NULL)
5384 goto fail_trans;
20a69341 5385
42a55769 5386 priv = set->ops->deactivate(ctx->net, set, &elem);
3971ca14 5387 if (priv == NULL) {
cc02e457 5388 err = -ENOENT;
20a1452c 5389 goto fail_ops;
cc02e457 5390 }
3971ca14
PNA		 5391 kfree(elem.priv);
5392 elem.priv = priv;
cc02e457 5393
59105446
PNA		 5394 nft_set_elem_deactivate(ctx->net, set, &elem);
5395
60319eb1 5396 nft_trans_elem(trans) = elem;
46bbafce 5397 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
0dc13625 5398 return 0;
cc02e457 5399
20a1452c 5400fail_ops:
cc02e457 5401 kfree(trans);
20a1452c 5402fail_trans:
3971ca14 5403 kfree(elem.priv);
20a1452c
PNA		 5404fail_elem:
5405 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
20a69341
PM		 5406 return err;
5407}
5408
8411b644 5409static int nft_flush_set(const struct nft_ctx *ctx,
de70185d 5410 struct nft_set *set,
8411b644 5411 const struct nft_set_iter *iter,
de70185d 5412 struct nft_set_elem *elem)
8411b644
PNA		 5413{
5414 struct nft_trans *trans;
5415 int err;
5416
5417 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5418 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5419 if (!trans)
5420 return -ENOMEM;
5421
1ba1c414 5422 if (!set->ops->flush(ctx->net, set, elem->priv)) {
8411b644
PNA		 5423 err = -ENOENT;
5424 goto err1;
5425 }
b2c11e4b 5426 set->ndeact++;
8411b644 5427
7acfda53 5428 nft_set_elem_deactivate(ctx->net, set, elem);
de70185d
PNA		 5429 nft_trans_elem_set(trans) = set;
5430 nft_trans_elem(trans) = *elem;
8411b644
PNA		 5431 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5432
5433 return 0;
5434err1:
5435 kfree(trans);
5436 return err;
5437}
5438
633c9a84
PNA		 5439static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5440 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5441 const struct nlattr * const nla[],
5442 struct netlink_ext_ack *extack)
20a69341 5443{
f2a6d766 5444 u8 genmask = nft_genmask_next(net);
20a69341
PM		 5445 const struct nlattr *attr;
5446 struct nft_set *set;
5447 struct nft_ctx ctx;
60319eb1 5448 int rem, err = 0;
20a69341 5449
36dd1bcc
PNA		 5450 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5451 genmask);
20a69341
PM		 5452 if (err < 0)
5453 return err;
5454
cac20fcd 5455 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
20a69341
PM		 5456 if (IS_ERR(set))
5457 return PTR_ERR(set);
5458 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5459 return -EBUSY;
5460
8411b644 5461 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
baa2d42c
PNA		 5462 struct nft_set_iter iter = {
5463 .genmask = genmask,
5464 .fn = nft_flush_set,
8411b644 5465 };
baa2d42c 5466 set->ops->walk(&ctx, set, &iter);
8411b644 5467
baa2d42c 5468 return iter.err;
8411b644
PNA		 5469 }
5470
20a69341
PM		 5471 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5472 err = nft_del_setelem(&ctx, set, attr);
5473 if (err < 0)
60319eb1 5474 break;
4fefee57 5475
3dd0673a 5476 set->ndeact++;
20a69341 5477 }
60319eb1 5478 return err;
20a69341
PM		 5479}
5480
cfed7e1b
PM		 5481void nft_set_gc_batch_release(struct rcu_head *rcu)
5482{
5483 struct nft_set_gc_batch *gcb;
5484 unsigned int i;
5485
5486 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5487 for (i = 0; i < gcb->head.cnt; i++)
61f9e292 5488 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
cfed7e1b
PM		 5489 kfree(gcb);
5490}
cfed7e1b
PM		 5491
5492struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5493 gfp_t gfp)
5494{
5495 struct nft_set_gc_batch *gcb;
5496
5497 gcb = kzalloc(sizeof(*gcb), gfp);
5498 if (gcb == NULL)
5499 return gcb;
5500 gcb->head.set = set;
5501 return gcb;
5502}
cfed7e1b 5503
e5009240
PNA		 5504/*
5505 * Stateful objects
5506 */
5507
5508/**
5509 * nft_register_obj- register nf_tables stateful object type
5510 * @obj: object type
5511 *
5512 * Registers the object type for use with nf_tables. Returns zero on
5513 * success or a negative errno code otherwise.
5514 */
5515int nft_register_obj(struct nft_object_type *obj_type)
5516{
5517 if (obj_type->type == NFT_OBJECT_UNSPEC)
5518 return -EINVAL;
5519
5520 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5521 list_add_rcu(&obj_type->list, &nf_tables_objects);
5522 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5523 return 0;
5524}
5525EXPORT_SYMBOL_GPL(nft_register_obj);
5526
5527/**
5528 * nft_unregister_obj - unregister nf_tables object type
5529 * @obj: object type
5530 *
5531 * Unregisters the object type for use with nf_tables.
5532 */
5533void nft_unregister_obj(struct nft_object_type *obj_type)
5534{
5535 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5536 list_del_rcu(&obj_type->list);
5537 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5538}
5539EXPORT_SYMBOL_GPL(nft_unregister_obj);
5540
4d44175a
FW		 5541struct nft_object *nft_obj_lookup(const struct net *net,
5542 const struct nft_table *table,
cac20fcd
PNA		 5543 const struct nlattr *nla, u32 objtype,
5544 u8 genmask)
e5009240 5545{
4d44175a
FW		 5546 struct nft_object_hash_key k = { .table = table };
5547 char search[NFT_OBJ_MAXNAMELEN];
5548 struct rhlist_head *tmp, *list;
e5009240
PNA		 5549 struct nft_object *obj;
5550
4d44175a
FW		 5551 nla_strlcpy(search, nla, sizeof(search));
5552 k.name = search;
5553
5554 WARN_ON_ONCE(!rcu_read_lock_held() &&
5555 !lockdep_commit_lock_is_held(net));
5556
5557 rcu_read_lock();
5558 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5559 if (!list)
5560 goto out;
5561
5562 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5563 if (objtype == obj->ops->type->type &&
5564 nft_active_genmask(obj, genmask)) {
5565 rcu_read_unlock();
e5009240 5566 return obj;
4d44175a 5567 }
e5009240 5568 }
4d44175a
FW		 5569out:
5570 rcu_read_unlock();
e5009240
PNA		 5571 return ERR_PTR(-ENOENT);
5572}
cac20fcd 5573EXPORT_SYMBOL_GPL(nft_obj_lookup);
e5009240 5574
cac20fcd
PNA		 5575static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5576 const struct nlattr *nla,
5577 u32 objtype, u8 genmask)
3ecbfd65
HS		 5578{
5579 struct nft_object *obj;
5580
5581 list_for_each_entry(obj, &table->objects, list) {
5582 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5583 objtype == obj->ops->type->type &&
5584 nft_active_genmask(obj, genmask))
5585 return obj;
5586 }
5587 return ERR_PTR(-ENOENT);
5588}
5589
e5009240 5590static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
b2fbd044
LZ		 5591 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5592 .len = NFT_TABLE_MAXNAMELEN - 1 },
5593 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5594 .len = NFT_OBJ_MAXNAMELEN - 1 },
e5009240
PNA		 5595 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5596 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
3ecbfd65 5597 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
e5009240
PNA		 5598};
5599
84fba055
FW		 5600static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5601 const struct nft_object_type *type,
e5009240
PNA		 5602 const struct nlattr *attr)
5603{
5b4c6e38 5604 struct nlattr **tb;
dfc46034 5605 const struct nft_object_ops *ops;
e5009240 5606 struct nft_object *obj;
5b4c6e38
GS		 5607 int err = -ENOMEM;
5608
5609 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5610 if (!tb)
5611 goto err1;
e5009240
PNA		 5612
5613 if (attr) {
8cb08174
JB		 5614 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5615 type->policy, NULL);
e5009240 5616 if (err < 0)
5b4c6e38 5617 goto err2;
e5009240
PNA		 5618 } else {
5619 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5620 }
5621
dfc46034
PBG		 5622 if (type->select_ops) {
5623 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5624 if (IS_ERR(ops)) {
5625 err = PTR_ERR(ops);
5b4c6e38 5626 goto err2;
dfc46034
PBG		 5627 }
5628 } else {
5629 ops = type->ops;
5630 }
5631
e5009240 5632 err = -ENOMEM;
dfc46034 5633 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5b4c6e38
GS		 5634 if (!obj)
5635 goto err2;
e5009240 5636
dfc46034 5637 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
e5009240 5638 if (err < 0)
5b4c6e38 5639 goto err3;
e5009240 5640
dfc46034
PBG		 5641 obj->ops = ops;
5642
5b4c6e38 5643 kfree(tb);
e5009240 5644 return obj;
5b4c6e38 5645err3:
e5009240 5646 kfree(obj);
5b4c6e38
GS		 5647err2:
5648 kfree(tb);
e5009240
PNA		 5649err1:
5650 return ERR_PTR(err);
5651}
5652
5653static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
43da04a5 5654 struct nft_object *obj, bool reset)
e5009240
PNA		 5655{
5656 struct nlattr *nest;
5657
ae0be8de 5658 nest = nla_nest_start_noflag(skb, attr);
e5009240
PNA		 5659 if (!nest)
5660 goto nla_put_failure;
dfc46034 5661 if (obj->ops->dump(skb, obj, reset) < 0)
e5009240
PNA		 5662 goto nla_put_failure;
5663 nla_nest_end(skb, nest);
5664 return 0;
5665
5666nla_put_failure:
5667 return -1;
5668}
5669
5670static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5671{
5672 const struct nft_object_type *type;
5673
5674 list_for_each_entry(type, &nf_tables_objects, list) {
5675 if (objtype == type->type)
5676 return type;
5677 }
5678 return NULL;
5679}
5680
452238e8
FW		 5681static const struct nft_object_type *
5682nft_obj_type_get(struct net *net, u32 objtype)
e5009240
PNA		 5683{
5684 const struct nft_object_type *type;
5685
5686 type = __nft_obj_type_get(objtype);
5687 if (type != NULL && try_module_get(type->owner))
5688 return type;
5689
f102d66b 5690 lockdep_nfnl_nft_mutex_not_held();
e5009240
PNA		 5691#ifdef CONFIG_MODULES
5692 if (type == NULL) {
eb014de4 5693 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
e5009240
PNA		 5694 return ERR_PTR(-EAGAIN);
5695 }
5696#endif
5697 return ERR_PTR(-ENOENT);
5698}
5699
d62d0ba9
FFM		 5700static int nf_tables_updobj(const struct nft_ctx *ctx,
5701 const struct nft_object_type *type,
5702 const struct nlattr *attr,
5703 struct nft_object *obj)
5704{
5705 struct nft_object *newobj;
5706 struct nft_trans *trans;
5707 int err;
5708
5709 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5710 sizeof(struct nft_trans_obj));
5711 if (!trans)
5712 return -ENOMEM;
5713
5714 newobj = nft_obj_init(ctx, type, attr);
5715 if (IS_ERR(newobj)) {
5716 err = PTR_ERR(newobj);
b74ae961 5717 goto err_free_trans;
d62d0ba9
FFM		 5718 }
5719
5720 nft_trans_obj(trans) = obj;
5721 nft_trans_obj_update(trans) = true;
5722 nft_trans_obj_newobj(trans) = newobj;
5723 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5724
5725 return 0;
b74ae961
DC		 5726
5727err_free_trans:
d62d0ba9 5728 kfree(trans);
d62d0ba9
FFM		 5729 return err;
5730}
5731
e5009240
PNA		 5732static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5733 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5734 const struct nlattr * const nla[],
5735 struct netlink_ext_ack *extack)
e5009240
PNA		 5736{
5737 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5738 const struct nft_object_type *type;
5739 u8 genmask = nft_genmask_next(net);
5740 int family = nfmsg->nfgen_family;
e5009240
PNA		 5741 struct nft_table *table;
5742 struct nft_object *obj;
5743 struct nft_ctx ctx;
5744 u32 objtype;
5745 int err;
5746
5747 if (!nla[NFTA_OBJ_TYPE] ||
5748 !nla[NFTA_OBJ_NAME] ||
5749 !nla[NFTA_OBJ_DATA])
5750 return -EINVAL;
5751
cac20fcd 5752 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5753 if (IS_ERR(table)) {
5754 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5755 return PTR_ERR(table);
36dd1bcc 5756 }
e5009240
PNA		 5757
5758 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 5759 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
e5009240
PNA		 5760 if (IS_ERR(obj)) {
5761 err = PTR_ERR(obj);
36dd1bcc
PNA		 5762 if (err != -ENOENT) {
5763 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5764 return err;
36dd1bcc 5765 }
1a28ad74 5766 } else {
36dd1bcc
PNA		 5767 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5768 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 5769 return -EEXIST;
36dd1bcc 5770 }
d62d0ba9
FFM		 5771 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5772 return -EOPNOTSUPP;
5773
fd57d0cb 5774 type = __nft_obj_type_get(objtype);
d62d0ba9
FFM		 5775 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5776
5777 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
e5009240
PNA		 5778 }
5779
98319cb9 5780 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240 5781
452238e8 5782 type = nft_obj_type_get(net, objtype);
e5009240
PNA		 5783 if (IS_ERR(type))
5784 return PTR_ERR(type);
5785
84fba055 5786 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
e5009240
PNA		 5787 if (IS_ERR(obj)) {
5788 err = PTR_ERR(obj);
5789 goto err1;
5790 }
d152159b 5791 obj->key.table = table;
3ecbfd65
HS		 5792 obj->handle = nf_tables_alloc_handle(table);
5793
d152159b
FW		 5794 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5795 if (!obj->key.name) {
61509575
PS		 5796 err = -ENOMEM;
5797 goto err2;
5798 }
e5009240
PNA		 5799
5800 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5801 if (err < 0)
61509575 5802 goto err3;
e5009240 5803
4d44175a
FW		 5804 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5805 nft_objname_ht_params);
5806 if (err < 0)
5807 goto err4;
5808
e5009240
PNA		 5809 list_add_tail_rcu(&obj->list, &table->objects);
5810 table->use++;
5811 return 0;
4d44175a
FW		 5812err4:
5813 /* queued in transaction log */
5814 INIT_LIST_HEAD(&obj->list);
5815 return err;
61509575 5816err3:
d152159b 5817 kfree(obj->key.name);
e5009240 5818err2:
dfc46034 5819 if (obj->ops->destroy)
00bfb320 5820 obj->ops->destroy(&ctx, obj);
e5009240
PNA		 5821 kfree(obj);
5822err1:
5823 module_put(type->owner);
5824 return err;
5825}
5826
5827static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5828 u32 portid, u32 seq, int event, u32 flags,
5829 int family, const struct nft_table *table,
43da04a5 5830 struct nft_object *obj, bool reset)
e5009240
PNA		 5831{
5832 struct nfgenmsg *nfmsg;
5833 struct nlmsghdr *nlh;
5834
dedb67c4 5835 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
e5009240
PNA		 5836 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5837 if (nlh == NULL)
5838 goto nla_put_failure;
5839
5840 nfmsg = nlmsg_data(nlh);
5841 nfmsg->nfgen_family = family;
5842 nfmsg->version = NFNETLINK_V0;
5843 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5844
5845 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
d152159b 5846 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
dfc46034 5847 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
e5009240 5848 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
3ecbfd65
HS		 5849 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5850 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5851 NFTA_OBJ_PAD))
e5009240
PNA		 5852 goto nla_put_failure;
5853
5854 nlmsg_end(skb, nlh);
5855 return 0;
5856
5857nla_put_failure:
5858 nlmsg_trim(skb, nlh);
5859 return -1;
5860}
5861
a9fea2a3 5862struct nft_obj_filter {
e46abbcc 5863 char *table;
a9fea2a3
PNA		 5864 u32 type;
5865};
5866
e5009240
PNA		 5867static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
5868{
5869 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
e5009240 5870 const struct nft_table *table;
e5009240 5871 unsigned int idx = 0, s_idx = cb->args[0];
a9fea2a3 5872 struct nft_obj_filter *filter = cb->data;
e5009240
PNA		 5873 struct net *net = sock_net(skb->sk);
5874 int family = nfmsg->nfgen_family;
43da04a5
PNA		 5875 struct nft_object *obj;
5876 bool reset = false;
5877
5878 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
5879 reset = true;
e5009240
PNA		 5880
5881 rcu_read_lock();
5882 cb->seq = net->nft.base_seq;
5883
36596dad 5884 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 5885 if (family != NFPROTO_UNSPEC && family != table->family)
e5009240
PNA		 5886 continue;
5887
36596dad
PNA		 5888 list_for_each_entry_rcu(obj, &table->objects, list) {
5889 if (!nft_is_active(net, obj))
5890 goto cont;
5891 if (idx < s_idx)
5892 goto cont;
5893 if (idx > s_idx)
5894 memset(&cb->args[1], 0,
5895 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 5896 if (filter && filter->table &&
36596dad
PNA		 5897 strcmp(filter->table, table->name))
5898 goto cont;
5899 if (filter &&
5900 filter->type != NFT_OBJECT_UNSPEC &&
5901 obj->ops->type->type != filter->type)
5902 goto cont;
a9fea2a3 5903
36596dad
PNA		 5904 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
5905 cb->nlh->nlmsg_seq,
5906 NFT_MSG_NEWOBJ,
5907 NLM_F_MULTI | NLM_F_APPEND,
98319cb9 5908 table->family, table,
36596dad
PNA		 5909 obj, reset) < 0)
5910 goto done;
e5009240 5911
36596dad 5912 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
e5009240 5913cont:
36596dad 5914 idx++;
e5009240
PNA		 5915 }
5916 }
5917done:
5918 rcu_read_unlock();
5919
5920 cb->args[0] = idx;
5921 return skb->len;
5922}
5923
90fd131a 5924static int nf_tables_dump_obj_start(struct netlink_callback *cb)
a9fea2a3 5925{
90fd131a
FW		 5926 const struct nlattr * const *nla = cb->data;
5927 struct nft_obj_filter *filter = NULL;
e46abbcc 5928
90fd131a
FW		 5929 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
5930 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
5931 if (!filter)
5932 return -ENOMEM;
5933
5934 if (nla[NFTA_OBJ_TABLE]) {
5935 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
5936 if (!filter->table) {
5937 kfree(filter);
5938 return -ENOMEM;
5939 }
5940 }
5941
5942 if (nla[NFTA_OBJ_TYPE])
5943 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8bea728d 5944 }
a9fea2a3 5945
90fd131a 5946 cb->data = filter;
a9fea2a3
PNA		 5947 return 0;
5948}
5949
90fd131a 5950static int nf_tables_dump_obj_done(struct netlink_callback *cb)
a9fea2a3 5951{
90fd131a 5952 struct nft_obj_filter *filter = cb->data;
a9fea2a3 5953
90fd131a
FW		 5954 if (filter) {
5955 kfree(filter->table);
5956 kfree(filter);
e46abbcc 5957 }
a9fea2a3 5958
90fd131a 5959 return 0;
a9fea2a3
PNA		 5960}
5961
d9adf22a 5962/* called with rcu_read_lock held */
e5009240
PNA		 5963static int nf_tables_getobj(struct net *net, struct sock *nlsk,
5964 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 5965 const struct nlattr * const nla[],
5966 struct netlink_ext_ack *extack)
e5009240
PNA		 5967{
5968 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5969 u8 genmask = nft_genmask_cur(net);
5970 int family = nfmsg->nfgen_family;
e5009240
PNA		 5971 const struct nft_table *table;
5972 struct nft_object *obj;
5973 struct sk_buff *skb2;
43da04a5 5974 bool reset = false;
e5009240
PNA		 5975 u32 objtype;
5976 int err;
5977
5978 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5979 struct netlink_dump_control c = {
90fd131a 5980 .start = nf_tables_dump_obj_start,
e5009240 5981 .dump = nf_tables_dump_obj,
a9fea2a3 5982 .done = nf_tables_dump_obj_done,
d9adf22a 5983 .module = THIS_MODULE,
90fd131a 5984 .data = (void *)nla,
e5009240 5985 };
a9fea2a3 5986
d9adf22a 5987 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
e5009240
PNA		 5988 }
5989
5990 if (!nla[NFTA_OBJ_NAME] ||
5991 !nla[NFTA_OBJ_TYPE])
5992 return -EINVAL;
5993
cac20fcd 5994 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 5995 if (IS_ERR(table)) {
5996 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 5997 return PTR_ERR(table);
36dd1bcc 5998 }
e5009240
PNA		 5999
6000 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4d44175a 6001 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
36dd1bcc
PNA		 6002 if (IS_ERR(obj)) {
6003 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
e5009240 6004 return PTR_ERR(obj);
36dd1bcc 6005 }
e5009240 6006
d9adf22a 6007 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
e5009240
PNA		 6008 if (!skb2)
6009 return -ENOMEM;
6010
43da04a5
PNA		 6011 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6012 reset = true;
6013
e5009240
PNA		 6014 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6015 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
43da04a5 6016 family, table, obj, reset);
e5009240
PNA		 6017 if (err < 0)
6018 goto err;
6019
6020 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6021err:
6022 kfree_skb(skb2);
6023 return err;
e5009240
PNA		 6024}
6025
00bfb320 6026static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
e5009240 6027{
dfc46034 6028 if (obj->ops->destroy)
00bfb320 6029 obj->ops->destroy(ctx, obj);
e5009240 6030
dfc46034 6031 module_put(obj->ops->type->owner);
d152159b 6032 kfree(obj->key.name);
e5009240
PNA		 6033 kfree(obj);
6034}
6035
6036static int nf_tables_delobj(struct net *net, struct sock *nlsk,
04ba724b
PNA		 6037 struct sk_buff *skb, const struct nlmsghdr *nlh,
6038 const struct nlattr * const nla[],
6039 struct netlink_ext_ack *extack)
e5009240
PNA		 6040{
6041 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6042 u8 genmask = nft_genmask_next(net);
6043 int family = nfmsg->nfgen_family;
36dd1bcc 6044 const struct nlattr *attr;
e5009240
PNA		 6045 struct nft_table *table;
6046 struct nft_object *obj;
6047 struct nft_ctx ctx;
6048 u32 objtype;
6049
6050 if (!nla[NFTA_OBJ_TYPE] ||
3ecbfd65 6051 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
e5009240
PNA		 6052 return -EINVAL;
6053
cac20fcd 6054 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
36dd1bcc
PNA		 6055 if (IS_ERR(table)) {
6056 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
e5009240 6057 return PTR_ERR(table);
36dd1bcc 6058 }
e5009240
PNA		 6059
6060 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
36dd1bcc
PNA		 6061 if (nla[NFTA_OBJ_HANDLE]) {
6062 attr = nla[NFTA_OBJ_HANDLE];
6063 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6064 } else {
6065 attr = nla[NFTA_OBJ_NAME];
4d44175a 6066 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
36dd1bcc
PNA		 6067 }
6068
6069 if (IS_ERR(obj)) {
6070 NL_SET_BAD_ATTR(extack, attr);
e5009240 6071 return PTR_ERR(obj);
36dd1bcc
PNA		 6072 }
6073 if (obj->use > 0) {
6074 NL_SET_BAD_ATTR(extack, attr);
e5009240 6075 return -EBUSY;
36dd1bcc 6076 }
e5009240 6077
98319cb9 6078 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
e5009240
PNA		 6079
6080 return nft_delobj(&ctx, obj);
6081}
6082
d152159b 6083void nft_obj_notify(struct net *net, const struct nft_table *table,
25e94a99
PNA		 6084 struct nft_object *obj, u32 portid, u32 seq, int event,
6085 int family, int report, gfp_t gfp)
e5009240
PNA		 6086{
6087 struct sk_buff *skb;
6088 int err;
6089
2599e989
PNA		 6090 if (!report &&
6091 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 6092 return;
e5009240 6093
2599e989 6094 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
e5009240
PNA		 6095 if (skb == NULL)
6096 goto err;
6097
2599e989
PNA		 6098 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6099 table, obj, false);
e5009240
PNA		 6100 if (err < 0) {
6101 kfree_skb(skb);
6102 goto err;
6103 }
6104
25e94a99
PNA		 6105 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
6106 return;
e5009240 6107err:
25e94a99 6108 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
e5009240 6109}
2599e989
PNA		 6110EXPORT_SYMBOL_GPL(nft_obj_notify);
6111
25e94a99
PNA		 6112static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6113 struct nft_object *obj, int event)
2599e989 6114{
25e94a99 6115 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
36596dad 6116 ctx->family, ctx->report, GFP_KERNEL);
2599e989 6117}
e5009240 6118
3b49e2e9
PNA		 6119/*
6120 * Flow tables
6121 */
6122void nft_register_flowtable_type(struct nf_flowtable_type *type)
6123{
6124 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6125 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6126 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6127}
6128EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6129
6130void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6131{
6132 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6133 list_del_rcu(&type->list);
6134 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6135}
6136EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6137
6138static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6139 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6140 .len = NFT_NAME_MAXLEN - 1 },
6141 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6142 .len = NFT_NAME_MAXLEN - 1 },
6143 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
3ecbfd65 6144 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8bb69f3b 6145 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
3b49e2e9
PNA		 6146};
6147
cac20fcd
PNA		 6148struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6149 const struct nlattr *nla, u8 genmask)
3b49e2e9
PNA		 6150{
6151 struct nft_flowtable *flowtable;
6152
d9adf22a 6153 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
3b49e2e9
PNA		 6154 if (!nla_strcmp(nla, flowtable->name) &&
6155 nft_active_genmask(flowtable, genmask))
6156 return flowtable;
6157 }
6158 return ERR_PTR(-ENOENT);
6159}
cac20fcd 6160EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
3b49e2e9 6161
9b05b6e1
LGL		 6162void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6163 struct nft_flowtable *flowtable,
6164 enum nft_trans_phase phase)
6165{
6166 switch (phase) {
6167 case NFT_TRANS_PREPARE:
6168 case NFT_TRANS_ABORT:
6169 case NFT_TRANS_RELEASE:
6170 flowtable->use--;
6171 /* fall through */
6172 default:
6173 return;
6174 }
6175}
6176EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6177
ae0662f8 6178static struct nft_flowtable *
cac20fcd
PNA		 6179nft_flowtable_lookup_byhandle(const struct nft_table *table,
6180 const struct nlattr *nla, u8 genmask)
3ecbfd65
HS		 6181{
6182 struct nft_flowtable *flowtable;
6183
6184 list_for_each_entry(flowtable, &table->flowtables, list) {
6185 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6186 nft_active_genmask(flowtable, genmask))
6187 return flowtable;
6188 }
6189 return ERR_PTR(-ENOENT);
6190}
6191
d9246a53
PNA		 6192struct nft_flowtable_hook {
6193 u32 num;
6194 int priority;
6195 struct list_head list;
6196};
6197
3b49e2e9
PNA		 6198static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6199 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6200 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6201 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6202};
6203
d9246a53
PNA		 6204static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6205 const struct nlattr *attr,
6206 struct nft_flowtable_hook *flowtable_hook,
5b6743fb 6207 struct nft_flowtable *flowtable, bool add)
3b49e2e9 6208{
3b49e2e9 6209 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
3f0465a9 6210 struct nft_hook *hook;
3b49e2e9 6211 int hooknum, priority;
3f0465a9 6212 int err;
3b49e2e9 6213
d9246a53
PNA		 6214 INIT_LIST_HEAD(&flowtable_hook->list);
6215
8cb08174
JB		 6216 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6217 nft_flowtable_hook_policy, NULL);
3b49e2e9
PNA		 6218 if (err < 0)
6219 return err;
6220
5b6743fb
PNA		 6221 if (add) {
6222 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6223 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6224 return -EINVAL;
3b49e2e9 6225
5b6743fb
PNA		 6226 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6227 if (hooknum != NF_NETDEV_INGRESS)
6228 return -EOPNOTSUPP;
6229
6230 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6231
6232 flowtable_hook->priority = priority;
6233 flowtable_hook->num = hooknum;
6234 } else {
6235 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6236 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6237 if (hooknum != flowtable->hooknum)
6238 return -EOPNOTSUPP;
6239 }
6240
6241 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6242 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6243 if (priority != flowtable->data.priority)
6244 return -EOPNOTSUPP;
6245 }
3b49e2e9 6246
5b6743fb
PNA		 6247 flowtable_hook->priority = flowtable->data.priority;
6248 flowtable_hook->num = flowtable->hooknum;
6249 }
3b49e2e9 6250
05abe445
PNA		 6251 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6252 err = nf_tables_parse_netdev_hooks(ctx->net,
6253 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6254 &flowtable_hook->list);
6255 if (err < 0)
6256 return err;
6257 }
3b49e2e9 6258
d9246a53 6259 list_for_each_entry(hook, &flowtable_hook->list, list) {
3f0465a9 6260 hook->ops.pf = NFPROTO_NETDEV;
5b6743fb
PNA		 6261 hook->ops.hooknum = flowtable_hook->num;
6262 hook->ops.priority = flowtable_hook->priority;
6263 hook->ops.priv = &flowtable->data;
6264 hook->ops.hook = flowtable->data.type->hook;
3b49e2e9
PNA		 6265 }
6266
3b49e2e9
PNA		 6267 return err;
6268}
6269
98319cb9 6270static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
3b49e2e9
PNA		 6271{
6272 const struct nf_flowtable_type *type;
6273
6274 list_for_each_entry(type, &nf_tables_flowtables, list) {
98319cb9 6275 if (family == type->family)
3b49e2e9
PNA		 6276 return type;
6277 }
6278 return NULL;
6279}
6280
452238e8
FW		 6281static const struct nf_flowtable_type *
6282nft_flowtable_type_get(struct net *net, u8 family)
3b49e2e9
PNA		 6283{
6284 const struct nf_flowtable_type *type;
6285
98319cb9 6286 type = __nft_flowtable_type_get(family);
3b49e2e9
PNA		 6287 if (type != NULL && try_module_get(type->owner))
6288 return type;
6289
f102d66b 6290 lockdep_nfnl_nft_mutex_not_held();
3b49e2e9
PNA		 6291#ifdef CONFIG_MODULES
6292 if (type == NULL) {
eb014de4 6293 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
3b49e2e9
PNA		 6294 return ERR_PTR(-EAGAIN);
6295 }
6296#endif
6297 return ERR_PTR(-ENOENT);
6298}
6299
5acab914 6300/* Only called from error and netdev event paths. */
ff4bf2f4
PNA		 6301static void nft_unregister_flowtable_hook(struct net *net,
6302 struct nft_flowtable *flowtable,
6303 struct nft_hook *hook)
6304{
6305 nf_unregister_net_hook(net, &hook->ops);
6306 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6307 FLOW_BLOCK_UNBIND);
6308}
6309
3b49e2e9 6310static void nft_unregister_flowtable_net_hooks(struct net *net,
f9382669 6311 struct list_head *hook_list)
3b49e2e9 6312{
3f0465a9 6313 struct nft_hook *hook;
3b49e2e9 6314
f9382669 6315 list_for_each_entry(hook, hook_list, list)
5acab914 6316 nf_unregister_net_hook(net, &hook->ops);
3f0465a9
PNA		 6317}
6318
6319static int nft_register_flowtable_net_hooks(struct net *net,
6320 struct nft_table *table,
f9382669 6321 struct list_head *hook_list,
3f0465a9
PNA		 6322 struct nft_flowtable *flowtable)
6323{
6324 struct nft_hook *hook, *hook2, *next;
6325 struct nft_flowtable *ft;
6326 int err, i = 0;
6327
f9382669 6328 list_for_each_entry(hook, hook_list, list) {
3f0465a9
PNA		 6329 list_for_each_entry(ft, &table->flowtables, list) {
6330 list_for_each_entry(hook2, &ft->hook_list, list) {
6331 if (hook->ops.dev == hook2->ops.dev &&
6332 hook->ops.pf == hook2->ops.pf) {
6333 err = -EBUSY;
6334 goto err_unregister_net_hooks;
6335 }
6336 }
6337 }
3b49e2e9 6338
d7c03a9f 6339 err = flowtable->data.type->setup(&flowtable->data,
6340 hook->ops.dev,
6341 FLOW_BLOCK_BIND);
3f0465a9
PNA		 6342 if (err < 0)
6343 goto err_unregister_net_hooks;
6344
d7c03a9f 6345 err = nf_register_net_hook(net, &hook->ops);
6346 if (err < 0) {
6347 flowtable->data.type->setup(&flowtable->data,
6348 hook->ops.dev,
6349 FLOW_BLOCK_UNBIND);
6350 goto err_unregister_net_hooks;
6351 }
6352
3f0465a9 6353 i++;
3b49e2e9 6354 }
3f0465a9
PNA		 6355
6356 return 0;
6357
6358err_unregister_net_hooks:
f9382669 6359 list_for_each_entry_safe(hook, next, hook_list, list) {
3f0465a9
PNA		 6360 if (i-- <= 0)
6361 break;
6362
ff4bf2f4 6363 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 6364 list_del_rcu(&hook->list);
6365 kfree_rcu(hook, rcu);
6366 }
6367
6368 return err;
3b49e2e9
PNA		 6369}
6370
389a2cbc
PNA		 6371static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6372{
6373 struct nft_hook *hook, *next;
6374
6375 list_for_each_entry_safe(hook, next, hook_list, list) {
6376 list_del_rcu(&hook->list);
6377 kfree_rcu(hook, rcu);
6378 }
6379}
6380
78d9f48f
PNA		 6381static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6382 struct nft_flowtable *flowtable)
6383{
6384 const struct nlattr * const *nla = ctx->nla;
6385 struct nft_flowtable_hook flowtable_hook;
6386 struct nft_hook *hook, *next;
6387 struct nft_trans *trans;
6388 bool unregister = false;
6389 int err;
6390
6391 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 6392 &flowtable_hook, flowtable, false);
78d9f48f
PNA		 6393 if (err < 0)
6394 return err;
6395
6396 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6397 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6398 list_del(&hook->list);
6399 kfree(hook);
6400 }
6401 }
6402
6403 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6404 &flowtable_hook.list, flowtable);
6405 if (err < 0)
6406 goto err_flowtable_update_hook;
6407
6408 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6409 sizeof(struct nft_trans_flowtable));
6410 if (!trans) {
6411 unregister = true;
6412 err = -ENOMEM;
6413 goto err_flowtable_update_hook;
6414 }
6415
6416 nft_trans_flowtable(trans) = flowtable;
6417 nft_trans_flowtable_update(trans) = true;
6418 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6419 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6420
6421 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6422
6423 return 0;
6424
6425err_flowtable_update_hook:
6426 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6427 if (unregister)
6428 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6429 list_del_rcu(&hook->list);
6430 kfree_rcu(hook, rcu);
6431 }
6432
6433 return err;
6434
6435}
6436
3b49e2e9
PNA		 6437static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6438 struct sk_buff *skb,
6439 const struct nlmsghdr *nlh,
6440 const struct nlattr * const nla[],
6441 struct netlink_ext_ack *extack)
6442{
6443 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
d9246a53 6444 struct nft_flowtable_hook flowtable_hook;
3b49e2e9
PNA		 6445 const struct nf_flowtable_type *type;
6446 u8 genmask = nft_genmask_next(net);
6447 int family = nfmsg->nfgen_family;
3f0465a9
PNA		 6448 struct nft_flowtable *flowtable;
6449 struct nft_hook *hook, *next;
3b49e2e9
PNA		 6450 struct nft_table *table;
6451 struct nft_ctx ctx;
3f0465a9 6452 int err;
3b49e2e9
PNA		 6453
6454 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6455 !nla[NFTA_FLOWTABLE_NAME] ||
6456 !nla[NFTA_FLOWTABLE_HOOK])
6457 return -EINVAL;
6458
cac20fcd
PNA		 6459 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6460 genmask);
36dd1bcc
PNA		 6461 if (IS_ERR(table)) {
6462 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 6463 return PTR_ERR(table);
36dd1bcc 6464 }
3b49e2e9 6465
cac20fcd
PNA		 6466 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6467 genmask);
3b49e2e9
PNA		 6468 if (IS_ERR(flowtable)) {
6469 err = PTR_ERR(flowtable);
36dd1bcc
PNA		 6470 if (err != -ENOENT) {
6471 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 6472 return err;
36dd1bcc 6473 }
3b49e2e9 6474 } else {
36dd1bcc
PNA		 6475 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6476 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
3b49e2e9 6477 return -EEXIST;
36dd1bcc 6478 }
3b49e2e9 6479
78d9f48f
PNA		 6480 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6481
6482 return nft_flowtable_update(&ctx, nlh, flowtable);
3b49e2e9
PNA		 6483 }
6484
98319cb9 6485 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
3b49e2e9
PNA		 6486
6487 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6488 if (!flowtable)
6489 return -ENOMEM;
6490
6491 flowtable->table = table;
3ecbfd65 6492 flowtable->handle = nf_tables_alloc_handle(table);
3f0465a9 6493 INIT_LIST_HEAD(&flowtable->hook_list);
3ecbfd65 6494
3b49e2e9
PNA		 6495 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6496 if (!flowtable->name) {
6497 err = -ENOMEM;
6498 goto err1;
6499 }
6500
452238e8 6501 type = nft_flowtable_type_get(net, family);
3b49e2e9
PNA		 6502 if (IS_ERR(type)) {
6503 err = PTR_ERR(type);
6504 goto err2;
6505 }
6506
8bb69f3b
PNA		 6507 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6508 flowtable->data.flags =
6509 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
cfbd1125 6510 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
8bb69f3b
PNA		 6511 goto err3;
6512 }
6513
6514 write_pnet(&flowtable->data.net, net);
3b49e2e9 6515 flowtable->data.type = type;
a268de77 6516 err = type->init(&flowtable->data);
3b49e2e9
PNA		 6517 if (err < 0)
6518 goto err3;
6519
d9246a53 6520 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 6521 &flowtable_hook, flowtable, true);
3b49e2e9 6522 if (err < 0)
a268de77 6523 goto err4;
3b49e2e9 6524
d9246a53
PNA		 6525 list_splice(&flowtable_hook.list, &flowtable->hook_list);
6526 flowtable->data.priority = flowtable_hook.priority;
6527 flowtable->hooknum = flowtable_hook.num;
6528
f9382669
PNA		 6529 err = nft_register_flowtable_net_hooks(ctx.net, table,
6530 &flowtable->hook_list,
6531 flowtable);
2d285f26 6532 if (err < 0) {
389a2cbc 6533 nft_flowtable_hooks_destroy(&flowtable->hook_list);
3f0465a9 6534 goto err4;
2d285f26 6535 }
3b49e2e9
PNA		 6536
6537 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6538 if (err < 0)
3f0465a9 6539 goto err5;
3b49e2e9
PNA		 6540
6541 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6542 table->use++;
6543
6544 return 0;
a268de77 6545err5:
3f0465a9 6546 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
ff4bf2f4 6547 nft_unregister_flowtable_hook(net, flowtable, hook);
3f0465a9
PNA		 6548 list_del_rcu(&hook->list);
6549 kfree_rcu(hook, rcu);
6550 }
a268de77
FF		 6551err4:
6552 flowtable->data.type->free(&flowtable->data);
3b49e2e9
PNA		 6553err3:
6554 module_put(type->owner);
6555err2:
6556 kfree(flowtable->name);
6557err1:
6558 kfree(flowtable);
6559 return err;
6560}
6561
3003055f
PNA		 6562static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6563{
6564 struct nft_hook *this, *next;
6565
6566 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6567 list_del(&this->list);
6568 kfree(this);
6569 }
6570}
6571
abadb2f8
PNA		 6572static int nft_delflowtable_hook(struct nft_ctx *ctx,
6573 struct nft_flowtable *flowtable)
6574{
6575 const struct nlattr * const *nla = ctx->nla;
6576 struct nft_flowtable_hook flowtable_hook;
3003055f 6577 struct nft_hook *this, *hook;
abadb2f8
PNA		 6578 struct nft_trans *trans;
6579 int err;
6580
6581 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
5b6743fb 6582 &flowtable_hook, flowtable, false);
abadb2f8
PNA		 6583 if (err < 0)
6584 return err;
6585
3003055f 6586 list_for_each_entry(this, &flowtable_hook.list, list) {
abadb2f8
PNA		 6587 hook = nft_hook_list_find(&flowtable->hook_list, this);
6588 if (!hook) {
6589 err = -ENOENT;
6590 goto err_flowtable_del_hook;
6591 }
6592 hook->inactive = true;
abadb2f8
PNA		 6593 }
6594
6595 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6596 sizeof(struct nft_trans_flowtable));
3003055f
PNA		 6597 if (!trans) {
6598 err = -ENOMEM;
6599 goto err_flowtable_del_hook;
6600 }
abadb2f8
PNA		 6601
6602 nft_trans_flowtable(trans) = flowtable;
6603 nft_trans_flowtable_update(trans) = true;
6604 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
3003055f 6605 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8
PNA		 6606
6607 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6608
6609 return 0;
6610
6611err_flowtable_del_hook:
3003055f
PNA		 6612 list_for_each_entry(this, &flowtable_hook.list, list) {
6613 hook = nft_hook_list_find(&flowtable->hook_list, this);
6614 if (!hook)
6615 break;
6616
abadb2f8 6617 hook->inactive = false;
3003055f
PNA		 6618 }
6619 nft_flowtable_hook_release(&flowtable_hook);
abadb2f8
PNA		 6620
6621 return err;
6622}
6623
3b49e2e9
PNA		 6624static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6625 struct sk_buff *skb,
6626 const struct nlmsghdr *nlh,
6627 const struct nlattr * const nla[],
6628 struct netlink_ext_ack *extack)
6629{
6630 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6631 u8 genmask = nft_genmask_next(net);
6632 int family = nfmsg->nfgen_family;
6633 struct nft_flowtable *flowtable;
36dd1bcc 6634 const struct nlattr *attr;
3b49e2e9
PNA		 6635 struct nft_table *table;
6636 struct nft_ctx ctx;
6637
e603ea4b
PNA		 6638 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6639 (!nla[NFTA_FLOWTABLE_NAME] &&
6640 !nla[NFTA_FLOWTABLE_HANDLE]))
6641 return -EINVAL;
6642
cac20fcd
PNA		 6643 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6644 genmask);
36dd1bcc
PNA		 6645 if (IS_ERR(table)) {
6646 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
3b49e2e9 6647 return PTR_ERR(table);
36dd1bcc 6648 }
3b49e2e9 6649
36dd1bcc
PNA		 6650 if (nla[NFTA_FLOWTABLE_HANDLE]) {
6651 attr = nla[NFTA_FLOWTABLE_HANDLE];
6652 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6653 } else {
6654 attr = nla[NFTA_FLOWTABLE_NAME];
6655 flowtable = nft_flowtable_lookup(table, attr, genmask);
6656 }
6657
6658 if (IS_ERR(flowtable)) {
6659 NL_SET_BAD_ATTR(extack, attr);
6660 return PTR_ERR(flowtable);
6661 }
abadb2f8
PNA		 6662
6663 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6664
6665 if (nla[NFTA_FLOWTABLE_HOOK])
6666 return nft_delflowtable_hook(&ctx, flowtable);
6667
36dd1bcc
PNA		 6668 if (flowtable->use > 0) {
6669 NL_SET_BAD_ATTR(extack, attr);
3b49e2e9 6670 return -EBUSY;
36dd1bcc 6671 }
3b49e2e9 6672
3b49e2e9
PNA		 6673 return nft_delflowtable(&ctx, flowtable);
6674}
6675
6676static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6677 u32 portid, u32 seq, int event,
6678 u32 flags, int family,
c42d8bda
PNA		 6679 struct nft_flowtable *flowtable,
6680 struct list_head *hook_list)
3b49e2e9
PNA		 6681{
6682 struct nlattr *nest, *nest_devs;
6683 struct nfgenmsg *nfmsg;
3f0465a9 6684 struct nft_hook *hook;
3b49e2e9 6685 struct nlmsghdr *nlh;
3b49e2e9
PNA		 6686
6687 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6688 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6689 if (nlh == NULL)
6690 goto nla_put_failure;
6691
6692 nfmsg = nlmsg_data(nlh);
6693 nfmsg->nfgen_family = family;
6694 nfmsg->version = NFNETLINK_V0;
6695 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6696
6697 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6698 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
3ecbfd65
HS		 6699 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6700 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8bb69f3b
PNA		 6701 NFTA_FLOWTABLE_PAD) ||
6702 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
3b49e2e9
PNA		 6703 goto nla_put_failure;
6704
ae0be8de 6705 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
eb895086
KL		 6706 if (!nest)
6707 goto nla_put_failure;
3b49e2e9 6708 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
71a8a63b 6709 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
3b49e2e9
PNA		 6710 goto nla_put_failure;
6711
ae0be8de 6712 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
3b49e2e9
PNA		 6713 if (!nest_devs)
6714 goto nla_put_failure;
6715
c42d8bda 6716 list_for_each_entry_rcu(hook, hook_list, list) {
3f0465a9 6717 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
3b49e2e9
PNA		 6718 goto nla_put_failure;
6719 }
6720 nla_nest_end(skb, nest_devs);
6721 nla_nest_end(skb, nest);
6722
6723 nlmsg_end(skb, nlh);
6724 return 0;
6725
6726nla_put_failure:
6727 nlmsg_trim(skb, nlh);
6728 return -1;
6729}
6730
6731struct nft_flowtable_filter {
6732 char *table;
6733};
6734
6735static int nf_tables_dump_flowtable(struct sk_buff *skb,
6736 struct netlink_callback *cb)
6737{
6738 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6739 struct nft_flowtable_filter *filter = cb->data;
6740 unsigned int idx = 0, s_idx = cb->args[0];
6741 struct net *net = sock_net(skb->sk);
6742 int family = nfmsg->nfgen_family;
6743 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 6744 const struct nft_table *table;
6745
6746 rcu_read_lock();
6747 cb->seq = net->nft.base_seq;
6748
36596dad 6749 list_for_each_entry_rcu(table, &net->nft.tables, list) {
98319cb9 6750 if (family != NFPROTO_UNSPEC && family != table->family)
3b49e2e9
PNA		 6751 continue;
6752
36596dad
PNA		 6753 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6754 if (!nft_is_active(net, flowtable))
6755 goto cont;
6756 if (idx < s_idx)
6757 goto cont;
6758 if (idx > s_idx)
6759 memset(&cb->args[1], 0,
6760 sizeof(cb->args) - sizeof(cb->args[0]));
360cc79d 6761 if (filter && filter->table &&
36596dad
PNA		 6762 strcmp(filter->table, table->name))
6763 goto cont;
3b49e2e9 6764
36596dad
PNA		 6765 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6766 cb->nlh->nlmsg_seq,
6767 NFT_MSG_NEWFLOWTABLE,
6768 NLM_F_MULTI | NLM_F_APPEND,
c42d8bda
PNA		 6769 table->family,
6770 flowtable,
6771 &flowtable->hook_list) < 0)
36596dad 6772 goto done;
3b49e2e9 6773
36596dad 6774 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3b49e2e9 6775cont:
36596dad 6776 idx++;
3b49e2e9
PNA		 6777 }
6778 }
6779done:
6780 rcu_read_unlock();
6781
6782 cb->args[0] = idx;
6783 return skb->len;
6784}
6785
90fd131a 6786static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
3b49e2e9 6787{
90fd131a
FW		 6788 const struct nlattr * const *nla = cb->data;
6789 struct nft_flowtable_filter *filter = NULL;
3b49e2e9 6790
90fd131a
FW		 6791 if (nla[NFTA_FLOWTABLE_TABLE]) {
6792 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6793 if (!filter)
6794 return -ENOMEM;
3b49e2e9 6795
90fd131a
FW		 6796 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6797 GFP_ATOMIC);
6798 if (!filter->table) {
6799 kfree(filter);
6800 return -ENOMEM;
6801 }
6802 }
3b49e2e9 6803
90fd131a 6804 cb->data = filter;
3b49e2e9
PNA		 6805 return 0;
6806}
6807
90fd131a 6808static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
3b49e2e9 6809{
90fd131a 6810 struct nft_flowtable_filter *filter = cb->data;
3b49e2e9 6811
3b49e2e9 6812 if (!filter)
90fd131a 6813 return 0;
3b49e2e9 6814
90fd131a
FW		 6815 kfree(filter->table);
6816 kfree(filter);
6817
6818 return 0;
3b49e2e9
PNA		 6819}
6820
d9adf22a 6821/* called with rcu_read_lock held */
3b49e2e9
PNA		 6822static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6823 struct sk_buff *skb,
6824 const struct nlmsghdr *nlh,
6825 const struct nlattr * const nla[],
6826 struct netlink_ext_ack *extack)
6827{
6828 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6829 u8 genmask = nft_genmask_cur(net);
6830 int family = nfmsg->nfgen_family;
6831 struct nft_flowtable *flowtable;
3b49e2e9
PNA		 6832 const struct nft_table *table;
6833 struct sk_buff *skb2;
6834 int err;
6835
6836 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6837 struct netlink_dump_control c = {
90fd131a 6838 .start = nf_tables_dump_flowtable_start,
3b49e2e9
PNA		 6839 .dump = nf_tables_dump_flowtable,
6840 .done = nf_tables_dump_flowtable_done,
d9adf22a 6841 .module = THIS_MODULE,
90fd131a 6842 .data = (void *)nla,
3b49e2e9
PNA		 6843 };
6844
d9adf22a 6845 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3b49e2e9
PNA		 6846 }
6847
6848 if (!nla[NFTA_FLOWTABLE_NAME])
6849 return -EINVAL;
6850
cac20fcd
PNA		 6851 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6852 genmask);
3b49e2e9
PNA		 6853 if (IS_ERR(table))
6854 return PTR_ERR(table);
6855
cac20fcd
PNA		 6856 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6857 genmask);
03a0120f 6858 if (IS_ERR(flowtable))
3b49e2e9
PNA		 6859 return PTR_ERR(flowtable);
6860
d9adf22a 6861 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3b49e2e9
PNA		 6862 if (!skb2)
6863 return -ENOMEM;
6864
6865 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
6866 nlh->nlmsg_seq,
6867 NFT_MSG_NEWFLOWTABLE, 0, family,
c42d8bda 6868 flowtable, &flowtable->hook_list);
3b49e2e9
PNA		 6869 if (err < 0)
6870 goto err;
6871
6872 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
6873err:
6874 kfree_skb(skb2);
6875 return err;
6876}
6877
6878static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
6879 struct nft_flowtable *flowtable,
c42d8bda 6880 struct list_head *hook_list,
3b49e2e9
PNA		 6881 int event)
6882{
6883 struct sk_buff *skb;
6884 int err;
6885
6886 if (ctx->report &&
6887 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
6888 return;
6889
6890 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6891 if (skb == NULL)
6892 goto err;
6893
6894 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
6895 ctx->seq, event, 0,
c42d8bda 6896 ctx->family, flowtable, hook_list);
3b49e2e9
PNA		 6897 if (err < 0) {
6898 kfree_skb(skb);
6899 goto err;
6900 }
6901
6902 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
6903 ctx->report, GFP_KERNEL);
6904 return;
6905err:
6906 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
6907}
6908
3b49e2e9
PNA		 6909static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
6910{
3f0465a9
PNA		 6911 struct nft_hook *hook, *next;
6912
5acab914 6913 flowtable->data.type->free(&flowtable->data);
3f0465a9 6914 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
5acab914
PNA		 6915 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6916 FLOW_BLOCK_UNBIND);
3f0465a9
PNA		 6917 list_del_rcu(&hook->list);
6918 kfree(hook);
6919 }
3b49e2e9 6920 kfree(flowtable->name);
3b49e2e9 6921 module_put(flowtable->data.type->owner);
a12486eb 6922 kfree(flowtable);
3b49e2e9
PNA		 6923}
6924
84d7fce6
PNA		 6925static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
6926 u32 portid, u32 seq)
6927{
6928 struct nlmsghdr *nlh;
6929 struct nfgenmsg *nfmsg;
784b4e61 6930 char buf[TASK_COMM_LEN];
dedb67c4 6931 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
84d7fce6
PNA		 6932
6933 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
6934 if (nlh == NULL)
6935 goto nla_put_failure;
6936
6937 nfmsg = nlmsg_data(nlh);
6938 nfmsg->nfgen_family = AF_UNSPEC;
6939 nfmsg->version = NFNETLINK_V0;
6940 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6941
784b4e61
PS		 6942 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
6943 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
6944 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
84d7fce6
PNA		 6945 goto nla_put_failure;
6946
053c095a
JB		 6947 nlmsg_end(skb, nlh);
6948 return 0;
84d7fce6
PNA		 6949
6950nla_put_failure:
6951 nlmsg_trim(skb, nlh);
6952 return -EMSGSIZE;
6953}
6954
3b49e2e9
PNA		 6955static void nft_flowtable_event(unsigned long event, struct net_device *dev,
6956 struct nft_flowtable *flowtable)
6957{
3f0465a9 6958 struct nft_hook *hook;
3b49e2e9 6959
3f0465a9
PNA		 6960 list_for_each_entry(hook, &flowtable->hook_list, list) {
6961 if (hook->ops.dev != dev)
3b49e2e9
PNA		 6962 continue;
6963
5acab914 6964 /* flow_offload_netdev_event() cleans up entries for us. */
ff4bf2f4 6965 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
3f0465a9
PNA		 6966 list_del_rcu(&hook->list);
6967 kfree_rcu(hook, rcu);
3b49e2e9
PNA		 6968 break;
6969 }
6970}
6971
6972static int nf_tables_flowtable_event(struct notifier_block *this,
6973 unsigned long event, void *ptr)
6974{
6975 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6976 struct nft_flowtable *flowtable;
6977 struct nft_table *table;
0a2cf5ee 6978 struct net *net;
3b49e2e9
PNA		 6979
6980 if (event != NETDEV_UNREGISTER)
6981 return 0;
6982
6a48de01 6983 net = dev_net(dev);
9e619d87 6984 mutex_lock(&net->nft.commit_mutex);
0a2cf5ee 6985 list_for_each_entry(table, &net->nft.tables, list) {
36596dad
PNA		 6986 list_for_each_entry(flowtable, &table->flowtables, list) {
6987 nft_flowtable_event(event, dev, flowtable);
3b49e2e9
PNA		 6988 }
6989 }
9e619d87 6990 mutex_unlock(&net->nft.commit_mutex);
6a48de01 6991
3b49e2e9
PNA		 6992 return NOTIFY_DONE;
6993}
6994
6995static struct notifier_block nf_tables_flowtable_notifier = {
6996 .notifier_call = nf_tables_flowtable_event,
6997};
6998
25e94a99
PNA		 6999static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7000 int event)
84d7fce6
PNA		 7001{
7002 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7003 struct sk_buff *skb2;
7004 int err;
7005
7006 if (nlmsg_report(nlh) &&
7007 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
25e94a99 7008 return;
84d7fce6 7009
84d7fce6
PNA		 7010 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7011 if (skb2 == NULL)
7012 goto err;
7013
7014 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7015 nlh->nlmsg_seq);
7016 if (err < 0) {
7017 kfree_skb(skb2);
7018 goto err;
7019 }
7020
25e94a99
PNA		 7021 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7022 nlmsg_report(nlh), GFP_KERNEL);
7023 return;
84d7fce6 7024err:
25e94a99
PNA		 7025 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7026 -ENOBUFS);
84d7fce6
PNA		 7027}
7028
7b8002a1
PNA		 7029static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7030 struct sk_buff *skb, const struct nlmsghdr *nlh,
04ba724b
PNA		 7031 const struct nlattr * const nla[],
7032 struct netlink_ext_ack *extack)
84d7fce6 7033{
84d7fce6
PNA		 7034 struct sk_buff *skb2;
7035 int err;
7036
d9adf22a 7037 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
84d7fce6
PNA		 7038 if (skb2 == NULL)
7039 return -ENOMEM;
7040
7041 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7042 nlh->nlmsg_seq);
7043 if (err < 0)
7044 goto err;
7045
7046 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
7047err:
7048 kfree_skb(skb2);
7049 return err;
7050}
7051
96518518
PM		 7052static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7053 [NFT_MSG_NEWTABLE] = {
55dd6f93 7054 .call_batch = nf_tables_newtable,
96518518
PM		 7055 .attr_count = NFTA_TABLE_MAX,
7056 .policy = nft_table_policy,
7057 },
7058 [NFT_MSG_GETTABLE] = {
d9adf22a 7059 .call_rcu = nf_tables_gettable,
96518518
PM		 7060 .attr_count = NFTA_TABLE_MAX,
7061 .policy = nft_table_policy,
7062 },
7063 [NFT_MSG_DELTABLE] = {
55dd6f93 7064 .call_batch = nf_tables_deltable,
96518518
PM		 7065 .attr_count = NFTA_TABLE_MAX,
7066 .policy = nft_table_policy,
7067 },
7068 [NFT_MSG_NEWCHAIN] = {
91c7b38d 7069 .call_batch = nf_tables_newchain,
96518518
PM		 7070 .attr_count = NFTA_CHAIN_MAX,
7071 .policy = nft_chain_policy,
7072 },
7073 [NFT_MSG_GETCHAIN] = {
d9adf22a 7074 .call_rcu = nf_tables_getchain,
96518518
PM		 7075 .attr_count = NFTA_CHAIN_MAX,
7076 .policy = nft_chain_policy,
7077 },
7078 [NFT_MSG_DELCHAIN] = {
91c7b38d 7079 .call_batch = nf_tables_delchain,
96518518
PM		 7080 .attr_count = NFTA_CHAIN_MAX,
7081 .policy = nft_chain_policy,
7082 },
7083 [NFT_MSG_NEWRULE] = {
0628b123 7084 .call_batch = nf_tables_newrule,
96518518
PM		 7085 .attr_count = NFTA_RULE_MAX,
7086 .policy = nft_rule_policy,
7087 },
7088 [NFT_MSG_GETRULE] = {
d9adf22a 7089 .call_rcu = nf_tables_getrule,
96518518
PM		 7090 .attr_count = NFTA_RULE_MAX,
7091 .policy = nft_rule_policy,
7092 },
7093 [NFT_MSG_DELRULE] = {
0628b123 7094 .call_batch = nf_tables_delrule,
96518518
PM		 7095 .attr_count = NFTA_RULE_MAX,
7096 .policy = nft_rule_policy,
7097 },
20a69341 7098 [NFT_MSG_NEWSET] = {
958bee14 7099 .call_batch = nf_tables_newset,
20a69341
PM		 7100 .attr_count = NFTA_SET_MAX,
7101 .policy = nft_set_policy,
7102 },
7103 [NFT_MSG_GETSET] = {
d9adf22a 7104 .call_rcu = nf_tables_getset,
20a69341
PM		 7105 .attr_count = NFTA_SET_MAX,
7106 .policy = nft_set_policy,
7107 },
7108 [NFT_MSG_DELSET] = {
958bee14 7109 .call_batch = nf_tables_delset,
20a69341
PM		 7110 .attr_count = NFTA_SET_MAX,
7111 .policy = nft_set_policy,
7112 },
7113 [NFT_MSG_NEWSETELEM] = {
958bee14 7114 .call_batch = nf_tables_newsetelem,
20a69341
PM		 7115 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7116 .policy = nft_set_elem_list_policy,
7117 },
7118 [NFT_MSG_GETSETELEM] = {
d9adf22a 7119 .call_rcu = nf_tables_getsetelem,
20a69341
PM		 7120 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7121 .policy = nft_set_elem_list_policy,
7122 },
7123 [NFT_MSG_DELSETELEM] = {
958bee14 7124 .call_batch = nf_tables_delsetelem,
20a69341
PM		 7125 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7126 .policy = nft_set_elem_list_policy,
7127 },
84d7fce6 7128 [NFT_MSG_GETGEN] = {
d9adf22a 7129 .call_rcu = nf_tables_getgen,
84d7fce6 7130 },
e5009240
PNA		 7131 [NFT_MSG_NEWOBJ] = {
7132 .call_batch = nf_tables_newobj,
7133 .attr_count = NFTA_OBJ_MAX,
7134 .policy = nft_obj_policy,
7135 },
7136 [NFT_MSG_GETOBJ] = {
d9adf22a 7137 .call_rcu = nf_tables_getobj,
e5009240
PNA		 7138 .attr_count = NFTA_OBJ_MAX,
7139 .policy = nft_obj_policy,
7140 },
7141 [NFT_MSG_DELOBJ] = {
7142 .call_batch = nf_tables_delobj,
7143 .attr_count = NFTA_OBJ_MAX,
7144 .policy = nft_obj_policy,
7145 },
43da04a5 7146 [NFT_MSG_GETOBJ_RESET] = {
d9adf22a 7147 .call_rcu = nf_tables_getobj,
43da04a5
PNA		 7148 .attr_count = NFTA_OBJ_MAX,
7149 .policy = nft_obj_policy,
7150 },
3b49e2e9
PNA		 7151 [NFT_MSG_NEWFLOWTABLE] = {
7152 .call_batch = nf_tables_newflowtable,
7153 .attr_count = NFTA_FLOWTABLE_MAX,
7154 .policy = nft_flowtable_policy,
7155 },
7156 [NFT_MSG_GETFLOWTABLE] = {
d9adf22a 7157 .call_rcu = nf_tables_getflowtable,
3b49e2e9
PNA		 7158 .attr_count = NFTA_FLOWTABLE_MAX,
7159 .policy = nft_flowtable_policy,
7160 },
7161 [NFT_MSG_DELFLOWTABLE] = {
7162 .call_batch = nf_tables_delflowtable,
7163 .attr_count = NFTA_FLOWTABLE_MAX,
7164 .policy = nft_flowtable_policy,
7165 },
96518518
PM		 7166};
7167
a654de8f
PNA		 7168static int nf_tables_validate(struct net *net)
7169{
7170 struct nft_table *table;
7171
7172 switch (net->nft.validate_state) {
7173 case NFT_VALIDATE_SKIP:
7174 break;
7175 case NFT_VALIDATE_NEED:
7176 nft_validate_state_update(net, NFT_VALIDATE_DO);
7177 /* fall through */
7178 case NFT_VALIDATE_DO:
7179 list_for_each_entry(table, &net->nft.tables, list) {
7180 if (nft_table_validate(net, table) < 0)
7181 return -EAGAIN;
7182 }
7183 break;
7184 }
7185
7186 return 0;
7187}
7188
66293c46
FW		 7189/* a drop policy has to be deferred until all rules have been activated,
7190 * otherwise a large ruleset that contains a drop-policy base chain will
7191 * cause all packets to get dropped until the full transaction has been
7192 * processed.
7193 *
7194 * We defer the drop policy until the transaction has been finalized.
7195 */
7196static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7197{
7198 struct nft_base_chain *basechain;
7199
7200 if (nft_trans_chain_policy(trans) != NF_DROP)
7201 return;
7202
7203 if (!nft_is_base_chain(trans->ctx.chain))
7204 return;
7205
7206 basechain = nft_base_chain(trans->ctx.chain);
7207 basechain->policy = NF_DROP;
7208}
7209
91c7b38d
PNA		 7210static void nft_chain_commit_update(struct nft_trans *trans)
7211{
7212 struct nft_base_chain *basechain;
7213
1b2470e5
FW		 7214 if (nft_trans_chain_name(trans)) {
7215 rhltable_remove(&trans->ctx.table->chains_ht,
7216 &trans->ctx.chain->rhlhead,
7217 nft_chain_ht_params);
d71efb59 7218 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
1b2470e5
FW		 7219 rhltable_insert_key(&trans->ctx.table->chains_ht,
7220 trans->ctx.chain->name,
7221 &trans->ctx.chain->rhlhead,
7222 nft_chain_ht_params);
7223 }
91c7b38d 7224
f323d954 7225 if (!nft_is_base_chain(trans->ctx.chain))
91c7b38d
PNA		 7226 return;
7227
53315ac6
FW		 7228 nft_chain_stats_replace(trans);
7229
91c7b38d 7230 basechain = nft_base_chain(trans->ctx.chain);
91c7b38d
PNA		 7231
7232 switch (nft_trans_chain_policy(trans)) {
7233 case NF_DROP:
7234 case NF_ACCEPT:
7235 basechain->policy = nft_trans_chain_policy(trans);
7236 break;
7237 }
7238}
7239
d62d0ba9
FFM		 7240static void nft_obj_commit_update(struct nft_trans *trans)
7241{
7242 struct nft_object *newobj;
7243 struct nft_object *obj;
7244
7245 obj = nft_trans_obj(trans);
7246 newobj = nft_trans_obj_newobj(trans);
7247
9fedd894
FFM		 7248 if (obj->ops->update)
7249 obj->ops->update(obj, newobj);
d62d0ba9
FFM		 7250
7251 kfree(newobj);
7252}
7253
2f99aa31 7254static void nft_commit_release(struct nft_trans *trans)
c7c32e72 7255{
c7c32e72
PNA		 7256 switch (trans->msg_type) {
7257 case NFT_MSG_DELTABLE:
7258 nf_tables_table_destroy(&trans->ctx);
7259 break;
9f8aac0b 7260 case NFT_MSG_NEWCHAIN:
53315ac6 7261 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b
FW		 7262 kfree(nft_trans_chain_name(trans));
7263 break;
c7c32e72 7264 case NFT_MSG_DELCHAIN:
43a605f2 7265 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 7266 break;
7267 case NFT_MSG_DELRULE:
7268 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7269 break;
7270 case NFT_MSG_DELSET:
0c2a85ed 7271 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 7272 break;
61edafbb 7273 case NFT_MSG_DELSETELEM:
3453c927
PNA		 7274 nf_tables_set_elem_destroy(&trans->ctx,
7275 nft_trans_elem_set(trans),
59105446 7276 nft_trans_elem(trans).priv);
61edafbb 7277 break;
e5009240 7278 case NFT_MSG_DELOBJ:
00bfb320 7279 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 7280 break;
3b49e2e9 7281 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 7282 if (nft_trans_flowtable_update(trans))
7283 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7284 else
7285 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 7286 break;
c7c32e72 7287 }
0935d558
FW		 7288
7289 if (trans->put_net)
7290 put_net(trans->ctx.net);
7291
c7c32e72
PNA		 7292 kfree(trans);
7293}
7294
0935d558 7295static void nf_tables_trans_destroy_work(struct work_struct *w)
2f99aa31
FW		 7296{
7297 struct nft_trans *trans, *next;
0935d558
FW		 7298 LIST_HEAD(head);
7299
7300 spin_lock(&nf_tables_destroy_list_lock);
7301 list_splice_init(&nf_tables_destroy_list, &head);
7302 spin_unlock(&nf_tables_destroy_list_lock);
2f99aa31 7303
0935d558 7304 if (list_empty(&head))
2f99aa31
FW		 7305 return;
7306
7307 synchronize_rcu();
7308
0935d558 7309 list_for_each_entry_safe(trans, next, &head, list) {
2f99aa31
FW		 7310 list_del(&trans->list);
7311 nft_commit_release(trans);
7312 }
7313}
7314
0cbc06b3
FW		 7315static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7316{
7317 struct nft_rule *rule;
7318 unsigned int alloc = 0;
7319 int i;
7320
7321 /* already handled or inactive chain? */
7322 if (chain->rules_next || !nft_is_active_next(net, chain))
7323 return 0;
7324
7325 rule = list_entry(&chain->rules, struct nft_rule, list);
7326 i = 0;
7327
7328 list_for_each_entry_continue(rule, &chain->rules, list) {
7329 if (nft_is_active_next(net, rule))
7330 alloc++;
7331 }
7332
7333 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7334 if (!chain->rules_next)
7335 return -ENOMEM;
7336
7337 list_for_each_entry_continue(rule, &chain->rules, list) {
7338 if (nft_is_active_next(net, rule))
7339 chain->rules_next[i++] = rule;
7340 }
7341
7342 chain->rules_next[i] = NULL;
7343 return 0;
7344}
7345
7346static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7347{
7348 struct nft_trans *trans, *next;
7349
7350 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7351 struct nft_chain *chain = trans->ctx.chain;
7352
7353 if (trans->msg_type == NFT_MSG_NEWRULE ||
7354 trans->msg_type == NFT_MSG_DELRULE) {
7355 kvfree(chain->rules_next);
7356 chain->rules_next = NULL;
7357 }
7358 }
7359}
7360
7361static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7362{
7363 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7364
7365 kvfree(o->start);
7366}
7367
7368static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7369{
7370 struct nft_rule **r = rules;
7371 struct nft_rules_old *old;
7372
7373 while (*r)
7374 r++;
7375
7376 r++; /* rcu_head is after end marker */
7377 old = (void *) r;
7378 old->start = rules;
7379
7380 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7381}
7382
0fb39bbe 7383static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
0cbc06b3
FW		 7384{
7385 struct nft_rule **g0, **g1;
7386 bool next_genbit;
7387
7388 next_genbit = nft_gencursor_next(net);
7389
7390 g0 = rcu_dereference_protected(chain->rules_gen_0,
f102d66b 7391 lockdep_commit_lock_is_held(net));
0cbc06b3 7392 g1 = rcu_dereference_protected(chain->rules_gen_1,
f102d66b 7393 lockdep_commit_lock_is_held(net));
0cbc06b3
FW		 7394
7395 /* No changes to this chain? */
7396 if (chain->rules_next == NULL) {
7397 /* chain had no change in last or next generation */
7398 if (g0 == g1)
7399 return;
7400 /*
7401 * chain had no change in this generation; make sure next
7402 * one uses same rules as current generation.
7403 */
7404 if (next_genbit) {
7405 rcu_assign_pointer(chain->rules_gen_1, g0);
7406 nf_tables_commit_chain_free_rules_old(g1);
7407 } else {
7408 rcu_assign_pointer(chain->rules_gen_0, g1);
7409 nf_tables_commit_chain_free_rules_old(g0);
7410 }
7411
7412 return;
7413 }
7414
7415 if (next_genbit)
7416 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7417 else
7418 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7419
7420 chain->rules_next = NULL;
7421
7422 if (g0 == g1)
7423 return;
7424
7425 if (next_genbit)
7426 nf_tables_commit_chain_free_rules_old(g1);
7427 else
7428 nf_tables_commit_chain_free_rules_old(g0);
7429}
7430
d152159b
FW		 7431static void nft_obj_del(struct nft_object *obj)
7432{
4d44175a 7433 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
d152159b
FW		 7434 list_del_rcu(&obj->list);
7435}
7436
1b2470e5
FW		 7437static void nft_chain_del(struct nft_chain *chain)
7438{
7439 struct nft_table *table = chain->table;
7440
7441 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7442 nft_chain_ht_params));
7443 list_del_rcu(&chain->list);
7444}
7445
abadb2f8
PNA		 7446static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7447 struct list_head *hook_list)
7448{
7449 struct nft_hook *hook, *next;
7450
7451 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7452 if (hook->inactive)
7453 list_move(&hook->list, hook_list);
7454 }
7455}
7456
eb014de4
PNA		 7457static void nf_tables_module_autoload_cleanup(struct net *net)
7458{
7459 struct nft_module_request *req, *next;
7460
7461 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7462 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7463 WARN_ON_ONCE(!req->done);
7464 list_del(&req->list);
7465 kfree(req);
7466 }
7467}
7468
0935d558
FW		 7469static void nf_tables_commit_release(struct net *net)
7470{
7471 struct nft_trans *trans;
7472
7473 /* all side effects have to be made visible.
7474 * For example, if a chain named 'foo' has been deleted, a
7475 * new transaction must not find it anymore.
7476 *
7477 * Memory reclaim happens asynchronously from work queue
7478 * to prevent expensive synchronize_rcu() in commit phase.
7479 */
7480 if (list_empty(&net->nft.commit_list)) {
eb014de4 7481 nf_tables_module_autoload_cleanup(net);
0935d558
FW		 7482 mutex_unlock(&net->nft.commit_mutex);
7483 return;
7484 }
7485
7486 trans = list_last_entry(&net->nft.commit_list,
7487 struct nft_trans, list);
7488 get_net(trans->ctx.net);
7489 WARN_ON_ONCE(trans->put_net);
7490
7491 trans->put_net = true;
7492 spin_lock(&nf_tables_destroy_list_lock);
7493 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7494 spin_unlock(&nf_tables_destroy_list_lock);
7495
eb014de4 7496 nf_tables_module_autoload_cleanup(net);
0935d558
FW		 7497 mutex_unlock(&net->nft.commit_mutex);
7498
7499 schedule_work(&trans_destroy_work);
7500}
7501
5913beaf 7502static int nf_tables_commit(struct net *net, struct sk_buff *skb)
37082f93 7503{
37082f93 7504 struct nft_trans *trans, *next;
a3716e70 7505 struct nft_trans_elem *te;
0cbc06b3
FW		 7506 struct nft_chain *chain;
7507 struct nft_table *table;
c9626a2c 7508 int err;
37082f93 7509
b8b27498
FW		 7510 if (list_empty(&net->nft.commit_list)) {
7511 mutex_unlock(&net->nft.commit_mutex);
7512 return 0;
7513 }
7514
a654de8f
PNA		 7515 /* 0. Validate ruleset, otherwise roll back for error reporting. */
7516 if (nf_tables_validate(net) < 0)
7517 return -EAGAIN;
7518
c9626a2c
PNA		 7519 err = nft_flow_rule_offload_commit(net);
7520 if (err < 0)
7521 return err;
7522
0cbc06b3
FW		 7523 /* 1. Allocate space for next generation rules_gen_X[] */
7524 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7525 int ret;
37082f93 7526
0cbc06b3
FW		 7527 if (trans->msg_type == NFT_MSG_NEWRULE ||
7528 trans->msg_type == NFT_MSG_DELRULE) {
7529 chain = trans->ctx.chain;
7530
7531 ret = nf_tables_commit_chain_prepare(net, chain);
7532 if (ret < 0) {
7533 nf_tables_commit_chain_prepare_cancel(net);
7534 return ret;
7535 }
7536 }
7537 }
37082f93 7538
0cbc06b3
FW		 7539 /* step 2. Make rules_gen_X visible to packet path */
7540 list_for_each_entry(table, &net->nft.tables, list) {
0fb39bbe
FW		 7541 list_for_each_entry(chain, &table->chains, list)
7542 nf_tables_commit_chain(net, chain);
0cbc06b3
FW		 7543 }
7544
7545 /*
7546 * Bump generation counter, invalidate any dump in progress.
7547 * Cannot fail after this point.
37082f93 7548 */
0cbc06b3
FW		 7549 while (++net->nft.base_seq == 0);
7550
7551 /* step 3. Start new generation, rules_gen_X now in use. */
7552 net->nft.gencursor = nft_gencursor_next(net);
37082f93
PNA		 7553
7554 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
b380e5c7 7555 switch (trans->msg_type) {
55dd6f93
PNA		 7556 case NFT_MSG_NEWTABLE:
7557 if (nft_trans_table_update(trans)) {
7558 if (!nft_trans_table_enable(trans)) {
664b0f8c 7559 nf_tables_table_disable(net,
55dd6f93
PNA		 7560 trans->ctx.table);
7561 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7562 }
7563 } else {
f2a6d766 7564 nft_clear(net, trans->ctx.table);
55dd6f93 7565 }
35151d84 7566 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
55dd6f93
PNA		 7567 nft_trans_destroy(trans);
7568 break;
7569 case NFT_MSG_DELTABLE:
f2a6d766 7570 list_del_rcu(&trans->ctx.table->list);
35151d84 7571 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
55dd6f93 7572 break;
91c7b38d 7573 case NFT_MSG_NEWCHAIN:
9f8aac0b 7574 if (nft_trans_chain_update(trans)) {
91c7b38d 7575 nft_chain_commit_update(trans);
9f8aac0b
FW		 7576 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7577 /* trans destroyed after rcu grace period */
7578 } else {
66293c46 7579 nft_chain_commit_drop_policy(trans);
664b0f8c 7580 nft_clear(net, trans->ctx.chain);
9f8aac0b
FW		 7581 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7582 nft_trans_destroy(trans);
7583 }
91c7b38d
PNA		 7584 break;
7585 case NFT_MSG_DELCHAIN:
1b2470e5 7586 nft_chain_del(trans->ctx.chain);
35151d84 7587 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
c974a3a3
PNA		 7588 nf_tables_unregister_hook(trans->ctx.net,
7589 trans->ctx.table,
7590 trans->ctx.chain);
91c7b38d 7591 break;
b380e5c7 7592 case NFT_MSG_NEWRULE:
889f7ee7 7593 nft_clear(trans->ctx.net, nft_trans_rule(trans));
35151d84 7594 nf_tables_rule_notify(&trans->ctx,
37082f93 7595 nft_trans_rule(trans),
35151d84 7596 NFT_MSG_NEWRULE);
37082f93 7597 nft_trans_destroy(trans);
b380e5c7
PNA		 7598 break;
7599 case NFT_MSG_DELRULE:
7600 list_del_rcu(&nft_trans_rule(trans)->list);
35151d84
PNA		 7601 nf_tables_rule_notify(&trans->ctx,
7602 nft_trans_rule(trans),
7603 NFT_MSG_DELRULE);
f6ac8585
PNA		 7604 nft_rule_expr_deactivate(&trans->ctx,
7605 nft_trans_rule(trans),
7606 NFT_TRANS_COMMIT);
b380e5c7 7607 break;
958bee14 7608 case NFT_MSG_NEWSET:
37a9cc52 7609 nft_clear(net, nft_trans_set(trans));
4fefee57
PNA		 7610 /* This avoids hitting -EBUSY when deleting the table
7611 * from the transaction.
7612 */
408070d6 7613 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
4fefee57
PNA		 7614 !list_empty(&nft_trans_set(trans)->bindings))
7615 trans->ctx.table->use--;
7616
958bee14 7617 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 7618 NFT_MSG_NEWSET, GFP_KERNEL);
958bee14
PNA		 7619 nft_trans_destroy(trans);
7620 break;
7621 case NFT_MSG_DELSET:
37a9cc52 7622 list_del_rcu(&nft_trans_set(trans)->list);
958bee14 7623 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
31f8441c 7624 NFT_MSG_DELSET, GFP_KERNEL);
958bee14 7625 break;
60319eb1 7626 case NFT_MSG_NEWSETELEM:
cc02e457
PM		 7627 te = (struct nft_trans_elem *)trans->data;
7628
42a55769 7629 te->set->ops->activate(net, te->set, &te->elem);
cc02e457
PM		 7630 nf_tables_setelem_notify(&trans->ctx, te->set,
7631 &te->elem,
60319eb1
PNA		 7632 NFT_MSG_NEWSETELEM, 0);
7633 nft_trans_destroy(trans);
7634 break;
7635 case NFT_MSG_DELSETELEM:
a3716e70 7636 te = (struct nft_trans_elem *)trans->data;
fe2811eb 7637
a3716e70
PNA		 7638 nf_tables_setelem_notify(&trans->ctx, te->set,
7639 &te->elem,
60319eb1 7640 NFT_MSG_DELSETELEM, 0);
5cb82a38 7641 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a
PM		 7642 atomic_dec(&te->set->nelems);
7643 te->set->ndeact--;
60319eb1 7644 break;
e5009240 7645 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 7646 if (nft_trans_obj_update(trans)) {
7647 nft_obj_commit_update(trans);
7648 nf_tables_obj_notify(&trans->ctx,
7649 nft_trans_obj(trans),
7650 NFT_MSG_NEWOBJ);
7651 } else {
7652 nft_clear(net, nft_trans_obj(trans));
7653 nf_tables_obj_notify(&trans->ctx,
7654 nft_trans_obj(trans),
7655 NFT_MSG_NEWOBJ);
7656 nft_trans_destroy(trans);
7657 }
e5009240
PNA		 7658 break;
7659 case NFT_MSG_DELOBJ:
d152159b 7660 nft_obj_del(nft_trans_obj(trans));
e5009240
PNA		 7661 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7662 NFT_MSG_DELOBJ);
7663 break;
3b49e2e9 7664 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 7665 if (nft_trans_flowtable_update(trans)) {
7666 nf_tables_flowtable_notify(&trans->ctx,
7667 nft_trans_flowtable(trans),
7668 &nft_trans_flowtable_hooks(trans),
7669 NFT_MSG_NEWFLOWTABLE);
7670 list_splice(&nft_trans_flowtable_hooks(trans),
7671 &nft_trans_flowtable(trans)->hook_list);
7672 } else {
7673 nft_clear(net, nft_trans_flowtable(trans));
7674 nf_tables_flowtable_notify(&trans->ctx,
7675 nft_trans_flowtable(trans),
7676 &nft_trans_flowtable(trans)->hook_list,
7677 NFT_MSG_NEWFLOWTABLE);
7678 }
3b49e2e9
PNA		 7679 nft_trans_destroy(trans);
7680 break;
7681 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 7682 if (nft_trans_flowtable_update(trans)) {
7683 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7684 &nft_trans_flowtable_hooks(trans));
7685 nf_tables_flowtable_notify(&trans->ctx,
7686 nft_trans_flowtable(trans),
7687 &nft_trans_flowtable_hooks(trans),
7688 NFT_MSG_DELFLOWTABLE);
7689 nft_unregister_flowtable_net_hooks(net,
7690 &nft_trans_flowtable_hooks(trans));
7691 } else {
7692 list_del_rcu(&nft_trans_flowtable(trans)->list);
7693 nf_tables_flowtable_notify(&trans->ctx,
7694 nft_trans_flowtable(trans),
7695 &nft_trans_flowtable(trans)->hook_list,
7696 NFT_MSG_DELFLOWTABLE);
7697 nft_unregister_flowtable_net_hooks(net,
7698 &nft_trans_flowtable(trans)->hook_list);
7699 }
3b49e2e9 7700 break;
37082f93 7701 }
37082f93
PNA		 7702 }
7703
84d7fce6 7704 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
0935d558 7705 nf_tables_commit_release(net);
37082f93
PNA		 7706
7707 return 0;
7708}
7709
eb014de4
PNA		 7710static void nf_tables_module_autoload(struct net *net)
7711{
7712 struct nft_module_request *req, *next;
7713 LIST_HEAD(module_list);
7714
7715 list_splice_init(&net->nft.module_list, &module_list);
7716 mutex_unlock(&net->nft.commit_mutex);
7717 list_for_each_entry_safe(req, next, &module_list, list) {
1d305ba4
FW		 7718 request_module("%s", req->module);
7719 req->done = true;
eb014de4
PNA		 7720 }
7721 mutex_lock(&net->nft.commit_mutex);
7722 list_splice(&module_list, &net->nft.module_list);
7723}
7724
b326dd37 7725static void nf_tables_abort_release(struct nft_trans *trans)
c7c32e72 7726{
c7c32e72
PNA		 7727 switch (trans->msg_type) {
7728 case NFT_MSG_NEWTABLE:
7729 nf_tables_table_destroy(&trans->ctx);
7730 break;
7731 case NFT_MSG_NEWCHAIN:
43a605f2 7732 nf_tables_chain_destroy(&trans->ctx);
c7c32e72
PNA		 7733 break;
7734 case NFT_MSG_NEWRULE:
7735 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7736 break;
7737 case NFT_MSG_NEWSET:
0c2a85ed 7738 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
c7c32e72 7739 break;
61edafbb
PM		 7740 case NFT_MSG_NEWSETELEM:
7741 nft_set_elem_destroy(nft_trans_elem_set(trans),
61f9e292 7742 nft_trans_elem(trans).priv, true);
61edafbb 7743 break;
e5009240 7744 case NFT_MSG_NEWOBJ:
00bfb320 7745 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
e5009240 7746 break;
3b49e2e9 7747 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 7748 if (nft_trans_flowtable_update(trans))
7749 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7750 else
7751 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
3b49e2e9 7752 break;
c7c32e72
PNA		 7753 }
7754 kfree(trans);
7755}
7756
eb014de4 7757static int __nf_tables_abort(struct net *net, bool autoload)
37082f93 7758{
37082f93 7759 struct nft_trans *trans, *next;
02263db0 7760 struct nft_trans_elem *te;
abadb2f8 7761 struct nft_hook *hook;
37082f93 7762
a907e36d
XL		 7763 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
7764 list) {
b380e5c7 7765 switch (trans->msg_type) {
55dd6f93
PNA		 7766 case NFT_MSG_NEWTABLE:
7767 if (nft_trans_table_update(trans)) {
7768 if (nft_trans_table_enable(trans)) {
664b0f8c 7769 nf_tables_table_disable(net,
55dd6f93
PNA		 7770 trans->ctx.table);
7771 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7772 }
7773 nft_trans_destroy(trans);
7774 } else {
e688a7f8 7775 list_del_rcu(&trans->ctx.table->list);
55dd6f93
PNA		 7776 }
7777 break;
7778 case NFT_MSG_DELTABLE:
f2a6d766 7779 nft_clear(trans->ctx.net, trans->ctx.table);
55dd6f93
PNA		 7780 nft_trans_destroy(trans);
7781 break;
91c7b38d
PNA		 7782 case NFT_MSG_NEWCHAIN:
7783 if (nft_trans_chain_update(trans)) {
982f4051 7784 free_percpu(nft_trans_chain_stats(trans));
9f8aac0b 7785 kfree(nft_trans_chain_name(trans));
91c7b38d
PNA		 7786 nft_trans_destroy(trans);
7787 } else {
4fefee57 7788 trans->ctx.table->use--;
1b2470e5 7789 nft_chain_del(trans->ctx.chain);
c974a3a3
PNA		 7790 nf_tables_unregister_hook(trans->ctx.net,
7791 trans->ctx.table,
7792 trans->ctx.chain);
91c7b38d
PNA		 7793 }
7794 break;
7795 case NFT_MSG_DELCHAIN:
4fefee57 7796 trans->ctx.table->use++;
664b0f8c 7797 nft_clear(trans->ctx.net, trans->ctx.chain);
91c7b38d
PNA		 7798 nft_trans_destroy(trans);
7799 break;
b380e5c7 7800 case NFT_MSG_NEWRULE:
4fefee57 7801 trans->ctx.chain->use--;
b380e5c7 7802 list_del_rcu(&nft_trans_rule(trans)->list);
f6ac8585
PNA		 7803 nft_rule_expr_deactivate(&trans->ctx,
7804 nft_trans_rule(trans),
7805 NFT_TRANS_ABORT);
b380e5c7
PNA		 7806 break;
7807 case NFT_MSG_DELRULE:
4fefee57 7808 trans->ctx.chain->use++;
889f7ee7 7809 nft_clear(trans->ctx.net, nft_trans_rule(trans));
bb7b40ae 7810 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
37082f93 7811 nft_trans_destroy(trans);
b380e5c7 7812 break;
958bee14 7813 case NFT_MSG_NEWSET:
4fefee57 7814 trans->ctx.table->use--;
6a0a8d10 7815 if (nft_trans_set_bound(trans)) {
40ba1d9b
PNA		 7816 nft_trans_destroy(trans);
7817 break;
7818 }
7819 list_del_rcu(&nft_trans_set(trans)->list);
958bee14
PNA		 7820 break;
7821 case NFT_MSG_DELSET:
4fefee57 7822 trans->ctx.table->use++;
37a9cc52 7823 nft_clear(trans->ctx.net, nft_trans_set(trans));
958bee14
PNA		 7824 nft_trans_destroy(trans);
7825 break;
60319eb1 7826 case NFT_MSG_NEWSETELEM:
6a0a8d10 7827 if (nft_trans_elem_set_bound(trans)) {
40ba1d9b
PNA		 7828 nft_trans_destroy(trans);
7829 break;
7830 }
02263db0 7831 te = (struct nft_trans_elem *)trans->data;
5cb82a38 7832 te->set->ops->remove(net, te->set, &te->elem);
3dd0673a 7833 atomic_dec(&te->set->nelems);
60319eb1
PNA		 7834 break;
7835 case NFT_MSG_DELSETELEM:
cc02e457
PM		 7836 te = (struct nft_trans_elem *)trans->data;
7837
59105446 7838 nft_set_elem_activate(net, te->set, &te->elem);
42a55769 7839 te->set->ops->activate(net, te->set, &te->elem);
3dd0673a 7840 te->set->ndeact--;
cc02e457 7841
e5009240
PNA		 7842 nft_trans_destroy(trans);
7843 break;
7844 case NFT_MSG_NEWOBJ:
d62d0ba9
FFM		 7845 if (nft_trans_obj_update(trans)) {
7846 kfree(nft_trans_obj_newobj(trans));
7847 nft_trans_destroy(trans);
7848 } else {
7849 trans->ctx.table->use--;
7850 nft_obj_del(nft_trans_obj(trans));
7851 }
e5009240
PNA		 7852 break;
7853 case NFT_MSG_DELOBJ:
7854 trans->ctx.table->use++;
7855 nft_clear(trans->ctx.net, nft_trans_obj(trans));
60319eb1
PNA		 7856 nft_trans_destroy(trans);
7857 break;
3b49e2e9 7858 case NFT_MSG_NEWFLOWTABLE:
78d9f48f
PNA		 7859 if (nft_trans_flowtable_update(trans)) {
7860 nft_unregister_flowtable_net_hooks(net,
7861 &nft_trans_flowtable_hooks(trans));
7862 } else {
7863 trans->ctx.table->use--;
7864 list_del_rcu(&nft_trans_flowtable(trans)->list);
7865 nft_unregister_flowtable_net_hooks(net,
7866 &nft_trans_flowtable(trans)->hook_list);
7867 }
3b49e2e9
PNA		 7868 break;
7869 case NFT_MSG_DELFLOWTABLE:
abadb2f8
PNA		 7870 if (nft_trans_flowtable_update(trans)) {
7871 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
7872 hook->inactive = false;
7873 } else {
7874 trans->ctx.table->use++;
7875 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
7876 }
3b49e2e9
PNA		 7877 nft_trans_destroy(trans);
7878 break;
37082f93 7879 }
37082f93
PNA		 7880 }
7881
b326dd37
PNA		 7882 synchronize_rcu();
7883
a1cee076
PNA		 7884 list_for_each_entry_safe_reverse(trans, next,
7885 &net->nft.commit_list, list) {
c7c32e72 7886 list_del(&trans->list);
b326dd37 7887 nf_tables_abort_release(trans);
37082f93
PNA		 7888 }
7889
eb014de4
PNA		 7890 if (autoload)
7891 nf_tables_module_autoload(net);
7892 else
7893 nf_tables_module_autoload_cleanup(net);
7894
37082f93
PNA		 7895 return 0;
7896}
7897
a654de8f
PNA		 7898static void nf_tables_cleanup(struct net *net)
7899{
7900 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
7901}
7902
eb014de4 7903static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
71ad00c5 7904{
eb014de4 7905 int ret = __nf_tables_abort(net, autoload);
f102d66b
FW		 7906
7907 mutex_unlock(&net->nft.commit_mutex);
7908
7909 return ret;
71ad00c5
FW		 7910}
7911
74e8bcd2
PNA		 7912static bool nf_tables_valid_genid(struct net *net, u32 genid)
7913{
f102d66b
FW		 7914 bool genid_ok;
7915
7916 mutex_lock(&net->nft.commit_mutex);
7917
7918 genid_ok = genid == 0 || net->nft.base_seq == genid;
7919 if (!genid_ok)
7920 mutex_unlock(&net->nft.commit_mutex);
7921
7922 /* else, commit mutex has to be released by commit or abort function */
7923 return genid_ok;
74e8bcd2
PNA		 7924}
7925
96518518
PM		 7926static const struct nfnetlink_subsystem nf_tables_subsys = {
7927 .name = "nf_tables",
7928 .subsys_id = NFNL_SUBSYS_NFTABLES,
7929 .cb_count = NFT_MSG_MAX,
7930 .cb = nf_tables_cb,
0628b123
PNA		 7931 .commit = nf_tables_commit,
7932 .abort = nf_tables_abort,
a654de8f 7933 .cleanup = nf_tables_cleanup,
74e8bcd2 7934 .valid_genid = nf_tables_valid_genid,
be2ab5b4 7935 .owner = THIS_MODULE,
96518518
PM		 7936};
7937
7210e4e3 7938int nft_chain_validate_dependency(const struct nft_chain *chain,
32537e91 7939 enum nft_chain_types type)
7210e4e3
PNA		 7940{
7941 const struct nft_base_chain *basechain;
7942
f323d954 7943 if (nft_is_base_chain(chain)) {
7210e4e3
PNA		 7944 basechain = nft_base_chain(chain);
7945 if (basechain->type->type != type)
7946 return -EOPNOTSUPP;
7947 }
7948 return 0;
7949}
7950EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
7951
75e8d06d
PNA		 7952int nft_chain_validate_hooks(const struct nft_chain *chain,
7953 unsigned int hook_flags)
7954{
7955 struct nft_base_chain *basechain;
7956
f323d954 7957 if (nft_is_base_chain(chain)) {
75e8d06d
PNA		 7958 basechain = nft_base_chain(chain);
7959
c974a3a3 7960 if ((1 << basechain->ops.hooknum) & hook_flags)
75e8d06d
PNA		 7961 return 0;
7962
7963 return -EOPNOTSUPP;
7964 }
7965
7966 return 0;
7967}
7968EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
7969
20a69341
PM		 7970/*
7971 * Loop detection - walk through the ruleset beginning at the destination chain
7972 * of a new jump until either the source chain is reached (loop) or all
7973 * reachable chains have been traversed.
7974 *
7975 * The loop check is performed whenever a new jump verdict is added to an
7976 * expression or verdict map or a verdict map is bound to a new chain.
7977 */
7978
7979static int nf_tables_check_loops(const struct nft_ctx *ctx,
7980 const struct nft_chain *chain);
7981
7982static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
de70185d 7983 struct nft_set *set,
20a69341 7984 const struct nft_set_iter *iter,
de70185d 7985 struct nft_set_elem *elem)
20a69341 7986{
fe2811eb
PM		 7987 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7988 const struct nft_data *data;
7989
7990 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
7991 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
62f9c8b4
PNA		 7992 return 0;
7993
fe2811eb 7994 data = nft_set_ext_data(ext);
1ca2e170 7995 switch (data->verdict.code) {
20a69341
PM		 7996 case NFT_JUMP:
7997 case NFT_GOTO:
1ca2e170 7998 return nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 7999 default:
8000 return 0;
8001 }
8002}
8003
8004static int nf_tables_check_loops(const struct nft_ctx *ctx,
8005 const struct nft_chain *chain)
8006{
8007 const struct nft_rule *rule;
8008 const struct nft_expr *expr, *last;
de70185d 8009 struct nft_set *set;
20a69341
PM		 8010 struct nft_set_binding *binding;
8011 struct nft_set_iter iter;
20a69341
PM		 8012
8013 if (ctx->chain == chain)
8014 return -ELOOP;
8015
8016 list_for_each_entry(rule, &chain->rules, list) {
8017 nft_rule_for_each_expr(expr, last, rule) {
a654de8f
PNA		 8018 struct nft_immediate_expr *priv;
8019 const struct nft_data *data;
0ca743a5
PNA		 8020 int err;
8021
a654de8f 8022 if (strcmp(expr->ops->type->name, "immediate"))
20a69341
PM		 8023 continue;
8024
a654de8f
PNA		 8025 priv = nft_expr_priv(expr);
8026 if (priv->dreg != NFT_REG_VERDICT)
0ca743a5 8027 continue;
20a69341 8028
a654de8f 8029 data = &priv->data;
1ca2e170 8030 switch (data->verdict.code) {
20a69341
PM		 8031 case NFT_JUMP:
8032 case NFT_GOTO:
1ca2e170
PM		 8033 err = nf_tables_check_loops(ctx,
8034 data->verdict.chain);
20a69341
PM		 8035 if (err < 0)
8036 return err;
8037 default:
8038 break;
8039 }
8040 }
8041 }
8042
8043 list_for_each_entry(set, &ctx->table->sets, list) {
37a9cc52
PNA		 8044 if (!nft_is_active_next(ctx->net, set))
8045 continue;
20a69341
PM		 8046 if (!(set->flags & NFT_SET_MAP) ||
8047 set->dtype != NFT_DATA_VERDICT)
8048 continue;
8049
8050 list_for_each_entry(binding, &set->bindings, list) {
11113e19
PM		 8051 if (!(binding->flags & NFT_SET_MAP) ||
8052 binding->chain != chain)
20a69341
PM		 8053 continue;
8054
8588ac09 8055 iter.genmask = nft_genmask_next(ctx->net);
20a69341
PM		 8056 iter.skip = 0;
8057 iter.count = 0;
8058 iter.err = 0;
8059 iter.fn = nf_tables_loop_check_setelem;
8060
8061 set->ops->walk(ctx, set, &iter);
8062 if (iter.err < 0)
8063 return iter.err;
8064 }
8065 }
8066
8067 return 0;
8068}
8069
36b701fa
LGL		 8070/**
8071 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
8072 *
8073 * @attr: netlink attribute to fetch value from
8074 * @max: maximum value to be stored in dest
8075 * @dest: pointer to the variable
8076 *
8077 * Parse, check and store a given u32 netlink attribute into variable.
8078 * This function returns -ERANGE if the value goes over maximum value.
8079 * Otherwise a 0 is returned and the attribute value is stored in the
8080 * destination variable.
8081 */
f1d505bb 8082int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
36b701fa 8083{
09525a09 8084 u32 val;
36b701fa
LGL		 8085
8086 val = ntohl(nla_get_be32(attr));
8087 if (val > max)
8088 return -ERANGE;
8089
8090 *dest = val;
8091 return 0;
8092}
8093EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8094
49499c3e
PM		 8095/**
8096 * nft_parse_register - parse a register value from a netlink attribute
8097 *
8098 * @attr: netlink attribute
8099 *
8100 * Parse and translate a register value from a netlink attribute.
8101 * Registers used to be 128 bit wide, these register numbers will be
8102 * mapped to the corresponding 32 bit register numbers.
8103 */
b1c96ed3
PM		 8104unsigned int nft_parse_register(const struct nlattr *attr)
8105{
49499c3e
PM		 8106 unsigned int reg;
8107
8108 reg = ntohl(nla_get_be32(attr));
8109 switch (reg) {
8110 case NFT_REG_VERDICT...NFT_REG_4:
8111 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8112 default:
8113 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8114 }
b1c96ed3
PM		 8115}
8116EXPORT_SYMBOL_GPL(nft_parse_register);
8117
49499c3e
PM		 8118/**
8119 * nft_dump_register - dump a register value to a netlink attribute
8120 *
8121 * @skb: socket buffer
8122 * @attr: attribute number
8123 * @reg: register number
8124 *
8125 * Construct a netlink attribute containing the register number. For
8126 * compatibility reasons, register numbers being a multiple of 4 are
8127 * translated to the corresponding 128 bit register numbers.
8128 */
b1c96ed3
PM		 8129int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8130{
49499c3e
PM		 8131 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8132 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8133 else
8134 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8135
b1c96ed3
PM		 8136 return nla_put_be32(skb, attr, htonl(reg));
8137}
8138EXPORT_SYMBOL_GPL(nft_dump_register);
8139
96518518 8140/**
d07db988 8141 * nft_validate_register_load - validate a load from a register
96518518
PM		 8142 *
8143 * @reg: the register number
d07db988 8144 * @len: the length of the data
96518518
PM		 8145 *
8146 * Validate that the input register is one of the general purpose
d07db988 8147 * registers and that the length of the load is within the bounds.
96518518 8148 */
d07db988 8149int nft_validate_register_load(enum nft_registers reg, unsigned int len)
96518518 8150{
49499c3e 8151 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
96518518 8152 return -EINVAL;
d07db988
PM		 8153 if (len == 0)
8154 return -EINVAL;
c593642c 8155 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
d07db988 8156 return -ERANGE;
49499c3e 8157
96518518
PM		 8158 return 0;
8159}
d07db988 8160EXPORT_SYMBOL_GPL(nft_validate_register_load);
96518518 8161
96518518 8162/**
1ec10212 8163 * nft_validate_register_store - validate an expressions' register store
96518518
PM		 8164 *
8165 * @ctx: context of the expression performing the load
8166 * @reg: the destination register number
8167 * @data: the data to load
8168 * @type: the data type
45d9bcda 8169 * @len: the length of the data
96518518
PM		 8170 *
8171 * Validate that a data load uses the appropriate data type for
45d9bcda
PM		 8172 * the destination register and the length is within the bounds.
8173 * A value of NULL for the data means that its runtime gathered
58f40ab6 8174 * data.
96518518 8175 */
1ec10212
PM		 8176int nft_validate_register_store(const struct nft_ctx *ctx,
8177 enum nft_registers reg,
8178 const struct nft_data *data,
8179 enum nft_data_types type, unsigned int len)
96518518 8180{
20a69341
PM		 8181 int err;
8182
96518518
PM		 8183 switch (reg) {
8184 case NFT_REG_VERDICT:
58f40ab6 8185 if (type != NFT_DATA_VERDICT)
96518518 8186 return -EINVAL;
20a69341 8187
58f40ab6 8188 if (data != NULL &&
1ca2e170
PM		 8189 (data->verdict.code == NFT_GOTO ||
8190 data->verdict.code == NFT_JUMP)) {
8191 err = nf_tables_check_loops(ctx, data->verdict.chain);
20a69341
PM		 8192 if (err < 0)
8193 return err;
20a69341
PM		 8194 }
8195
96518518
PM		 8196 return 0;
8197 default:
49499c3e 8198 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
27e6d201 8199 return -EINVAL;
45d9bcda
PM		 8200 if (len == 0)
8201 return -EINVAL;
49499c3e 8202 if (reg * NFT_REG32_SIZE + len >
c593642c 8203 sizeof_field(struct nft_regs, data))
45d9bcda 8204 return -ERANGE;
27e6d201 8205
96518518
PM		 8206 if (data != NULL && type != NFT_DATA_VALUE)
8207 return -EINVAL;
8208 return 0;
8209 }
8210}
1ec10212 8211EXPORT_SYMBOL_GPL(nft_validate_register_store);
96518518
PM		 8212
8213static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8214 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
8215 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
8216 .len = NFT_CHAIN_MAXNAMELEN - 1 },
8217};
8218
8219static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8220 struct nft_data_desc *desc, const struct nlattr *nla)
8221{
664b0f8c 8222 u8 genmask = nft_genmask_next(ctx->net);
96518518
PM		 8223 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8224 struct nft_chain *chain;
8225 int err;
8226
8cb08174
JB		 8227 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8228 nft_verdict_policy, NULL);
96518518
PM		 8229 if (err < 0)
8230 return err;
8231
8232 if (!tb[NFTA_VERDICT_CODE])
8233 return -EINVAL;
1ca2e170 8234 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
96518518 8235
1ca2e170 8236 switch (data->verdict.code) {
e0abdadc 8237 default:
1ca2e170 8238 switch (data->verdict.code & NF_VERDICT_MASK) {
e0abdadc
PM		 8239 case NF_ACCEPT:
8240 case NF_DROP:
8241 case NF_QUEUE:
8242 break;
8243 default:
8244 return -EINVAL;
8245 }
8246 /* fall through */
96518518
PM		 8247 case NFT_CONTINUE:
8248 case NFT_BREAK:
8249 case NFT_RETURN:
96518518
PM		 8250 break;
8251 case NFT_JUMP:
8252 case NFT_GOTO:
8253 if (!tb[NFTA_VERDICT_CHAIN])
8254 return -EINVAL;
f102d66b
FW		 8255 chain = nft_chain_lookup(ctx->net, ctx->table,
8256 tb[NFTA_VERDICT_CHAIN], genmask);
96518518
PM		 8257 if (IS_ERR(chain))
8258 return PTR_ERR(chain);
f323d954 8259 if (nft_is_base_chain(chain))
96518518
PM		 8260 return -EOPNOTSUPP;
8261
96518518 8262 chain->use++;
1ca2e170 8263 data->verdict.chain = chain;
96518518 8264 break;
96518518
PM		 8265 }
8266
4c4ed074 8267 desc->len = sizeof(data->verdict);
96518518
PM		 8268 desc->type = NFT_DATA_VERDICT;
8269 return 0;
8270}
8271
8272static void nft_verdict_uninit(const struct nft_data *data)
8273{
1ca2e170 8274 switch (data->verdict.code) {
96518518
PM		 8275 case NFT_JUMP:
8276 case NFT_GOTO:
1ca2e170 8277 data->verdict.chain->use--;
96518518
PM		 8278 break;
8279 }
8280}
8281
33d5a7b1 8282int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
96518518
PM		 8283{
8284 struct nlattr *nest;
8285
ae0be8de 8286 nest = nla_nest_start_noflag(skb, type);
96518518
PM		 8287 if (!nest)
8288 goto nla_put_failure;
8289
33d5a7b1 8290 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
96518518
PM		 8291 goto nla_put_failure;
8292
33d5a7b1 8293 switch (v->code) {
96518518
PM		 8294 case NFT_JUMP:
8295 case NFT_GOTO:
1ca2e170 8296 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
33d5a7b1 8297 v->chain->name))
96518518
PM		 8298 goto nla_put_failure;
8299 }
8300 nla_nest_end(skb, nest);
8301 return 0;
8302
8303nla_put_failure:
8304 return -1;
8305}
8306
d0a11fc3
PM		 8307static int nft_value_init(const struct nft_ctx *ctx,
8308 struct nft_data *data, unsigned int size,
96518518
PM		 8309 struct nft_data_desc *desc, const struct nlattr *nla)
8310{
8311 unsigned int len;
8312
8313 len = nla_len(nla);
8314 if (len == 0)
8315 return -EINVAL;
d0a11fc3 8316 if (len > size)
96518518
PM		 8317 return -EOVERFLOW;
8318
d0a11fc3 8319 nla_memcpy(data->data, nla, len);
96518518
PM		 8320 desc->type = NFT_DATA_VALUE;
8321 desc->len = len;
8322 return 0;
8323}
8324
8325static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8326 unsigned int len)
8327{
8328 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8329}
8330
8331static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
d0a11fc3 8332 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
96518518
PM		 8333 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
8334};
8335
8336/**
8337 * nft_data_init - parse nf_tables data netlink attributes
8338 *
8339 * @ctx: context of the expression using the data
8340 * @data: destination struct nft_data
d0a11fc3 8341 * @size: maximum data length
96518518
PM		 8342 * @desc: data description
8343 * @nla: netlink attribute containing data
8344 *
8345 * Parse the netlink data attributes and initialize a struct nft_data.
8346 * The type and length of data are returned in the data description.
8347 *
8348 * The caller can indicate that it only wants to accept data of type
8349 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8350 */
d0a11fc3
PM		 8351int nft_data_init(const struct nft_ctx *ctx,
8352 struct nft_data *data, unsigned int size,
96518518
PM		 8353 struct nft_data_desc *desc, const struct nlattr *nla)
8354{
8355 struct nlattr *tb[NFTA_DATA_MAX + 1];
8356 int err;
8357
8cb08174
JB		 8358 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8359 nft_data_policy, NULL);
96518518
PM		 8360 if (err < 0)
8361 return err;
8362
8363 if (tb[NFTA_DATA_VALUE])
d0a11fc3
PM		 8364 return nft_value_init(ctx, data, size, desc,
8365 tb[NFTA_DATA_VALUE]);
96518518
PM		 8366 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8367 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8368 return -EINVAL;
8369}
8370EXPORT_SYMBOL_GPL(nft_data_init);
8371
8372/**
59105446 8373 * nft_data_release - release a nft_data item
96518518
PM		 8374 *
8375 * @data: struct nft_data to release
8376 * @type: type of data
8377 *
8378 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8379 * all others need to be released by calling this function.
8380 */
59105446 8381void nft_data_release(const struct nft_data *data, enum nft_data_types type)
96518518 8382{
960bd2c2 8383 if (type < NFT_DATA_VERDICT)
96518518 8384 return;
960bd2c2 8385 switch (type) {
96518518
PM		 8386 case NFT_DATA_VERDICT:
8387 return nft_verdict_uninit(data);
8388 default:
8389 WARN_ON(1);
8390 }
8391}
59105446 8392EXPORT_SYMBOL_GPL(nft_data_release);
96518518
PM		 8393
8394int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8395 enum nft_data_types type, unsigned int len)
8396{
8397 struct nlattr *nest;
8398 int err;
8399
ae0be8de 8400 nest = nla_nest_start_noflag(skb, attr);
96518518
PM		 8401 if (nest == NULL)
8402 return -1;
8403
8404 switch (type) {
8405 case NFT_DATA_VALUE:
8406 err = nft_value_dump(skb, data, len);
8407 break;
8408 case NFT_DATA_VERDICT:
33d5a7b1 8409 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
96518518
PM		 8410 break;
8411 default:
8412 err = -EINVAL;
8413 WARN_ON(1);
8414 }
8415
8416 nla_nest_end(skb, nest);
8417 return err;
8418}
8419EXPORT_SYMBOL_GPL(nft_data_dump);
8420
5ebe0b0e
PNA		 8421int __nft_release_basechain(struct nft_ctx *ctx)
8422{
8423 struct nft_rule *rule, *nr;
8424
fa5950e4
FW		 8425 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8426 return 0;
5ebe0b0e 8427
c974a3a3 8428 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
5ebe0b0e
PNA		 8429 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8430 list_del(&rule->list);
8431 ctx->chain->use--;
bb7b40ae 8432 nf_tables_rule_release(ctx, rule);
5ebe0b0e 8433 }
1b2470e5 8434 nft_chain_del(ctx->chain);
5ebe0b0e 8435 ctx->table->use--;
43a605f2 8436 nf_tables_chain_destroy(ctx);
5ebe0b0e
PNA		 8437
8438 return 0;
8439}
8440EXPORT_SYMBOL_GPL(__nft_release_basechain);
8441
98319cb9 8442static void __nft_release_tables(struct net *net)
df05ef87 8443{
3b49e2e9 8444 struct nft_flowtable *flowtable, *nf;
df05ef87
PNA		 8445 struct nft_table *table, *nt;
8446 struct nft_chain *chain, *nc;
e5009240 8447 struct nft_object *obj, *ne;
df05ef87
PNA		 8448 struct nft_rule *rule, *nr;
8449 struct nft_set *set, *ns;
8450 struct nft_ctx ctx = {
8451 .net = net,
43a605f2 8452 .family = NFPROTO_NETDEV,
df05ef87
PNA		 8453 };
8454
36596dad 8455 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
98319cb9 8456 ctx.family = table->family;
dd4cbef7 8457
df05ef87 8458 list_for_each_entry(chain, &table->chains, list)
c974a3a3 8459 nf_tables_unregister_hook(net, table, chain);
df05ef87
PNA		 8460 /* No packets are walking on these chains anymore. */
8461 ctx.table = table;
8462 list_for_each_entry(chain, &table->chains, list) {
8463 ctx.chain = chain;
8464 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8465 list_del(&rule->list);
8466 chain->use--;
bb7b40ae 8467 nf_tables_rule_release(&ctx, rule);
df05ef87
PNA		 8468 }
8469 }
3b49e2e9
PNA		 8470 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8471 list_del(&flowtable->list);
8472 table->use--;
8473 nf_tables_flowtable_destroy(flowtable);
8474 }
df05ef87
PNA		 8475 list_for_each_entry_safe(set, ns, &table->sets, list) {
8476 list_del(&set->list);
8477 table->use--;
0c2a85ed 8478 nft_set_destroy(&ctx, set);
df05ef87 8479 }
e5009240 8480 list_for_each_entry_safe(obj, ne, &table->objects, list) {
d152159b 8481 nft_obj_del(obj);
e5009240 8482 table->use--;
00bfb320 8483 nft_obj_destroy(&ctx, obj);
e5009240 8484 }
df05ef87 8485 list_for_each_entry_safe(chain, nc, &table->chains, list) {
43a605f2 8486 ctx.chain = chain;
1b2470e5 8487 nft_chain_del(chain);
df05ef87 8488 table->use--;
43a605f2 8489 nf_tables_chain_destroy(&ctx);
df05ef87
PNA		 8490 }
8491 list_del(&table->list);
8492 nf_tables_table_destroy(&ctx);
8493 }
8494}
8495
dd4cbef7
PNA		 8496static int __net_init nf_tables_init_net(struct net *net)
8497{
8498 INIT_LIST_HEAD(&net->nft.tables);
8499 INIT_LIST_HEAD(&net->nft.commit_list);
eb014de4 8500 INIT_LIST_HEAD(&net->nft.module_list);
f102d66b 8501 mutex_init(&net->nft.commit_mutex);
dd4cbef7 8502 net->nft.base_seq = 1;
a654de8f
PNA		 8503 net->nft.validate_state = NFT_VALIDATE_SKIP;
8504
dd4cbef7
PNA		 8505 return 0;
8506}
8507
8508static void __net_exit nf_tables_exit_net(struct net *net)
8509{
f102d66b 8510 mutex_lock(&net->nft.commit_mutex);
71ad00c5 8511 if (!list_empty(&net->nft.commit_list))
eb014de4 8512 __nf_tables_abort(net, false);
98319cb9 8513 __nft_release_tables(net);
f102d66b 8514 mutex_unlock(&net->nft.commit_mutex);
dd4cbef7 8515 WARN_ON_ONCE(!list_empty(&net->nft.tables));
1d305ba4 8516 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
dd4cbef7
PNA		 8517}
8518
99633ab2
PNA		 8519static struct pernet_operations nf_tables_net_ops = {
8520 .init = nf_tables_init_net,
613d0776 8521 .exit = nf_tables_exit_net,
99633ab2
PNA		 8522};
8523
96518518
PM		 8524static int __init nf_tables_module_init(void)
8525{
8526 int err;
8527
0935d558 8528 spin_lock_init(&nf_tables_destroy_list_lock);
d209df3e
FW		 8529 err = register_pernet_subsys(&nf_tables_net_ops);
8530 if (err < 0)
8531 return err;
8532
8533 err = nft_chain_filter_init();
8534 if (err < 0)
8535 goto err1;
02c7b25e 8536
96518518
PM		 8537 err = nf_tables_core_module_init();
8538 if (err < 0)
d209df3e 8539 goto err2;
96518518 8540
d209df3e 8541 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
96518518 8542 if (err < 0)
d209df3e 8543 goto err3;
96518518 8544
4d44175a
FW		 8545 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8546 if (err < 0)
8547 goto err4;
8548
06d392cb 8549 err = nft_offload_init();
8550 if (err < 0)
8551 goto err5;
8552
d209df3e
FW		 8553 /* must be last */
8554 err = nfnetlink_subsys_register(&nf_tables_subsys);
8555 if (err < 0)
06d392cb 8556 goto err6;
3b49e2e9 8557
c1deb065 8558 nft_chain_route_init();
3474a2c6 8559
d209df3e 8560 return err;
06d392cb 8561err6:
8562 nft_offload_exit();
4d44175a
FW		 8563err5:
8564 rhltable_destroy(&nft_objname_ht);
d209df3e
FW		 8565err4:
8566 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8567err3:
96518518 8568 nf_tables_core_module_exit();
d209df3e
FW		 8569err2:
8570 nft_chain_filter_fini();
8571err1:
8572 unregister_pernet_subsys(&nf_tables_net_ops);
96518518
PM		 8573 return err;
8574}
8575
8576static void __exit nf_tables_module_exit(void)
8577{
8578 nfnetlink_subsys_unregister(&nf_tables_subsys);
06d392cb 8579 nft_offload_exit();
3b49e2e9 8580 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
0a2cf5ee 8581 nft_chain_filter_fini();
c1deb065 8582 nft_chain_route_fini();
71ad00c5 8583 unregister_pernet_subsys(&nf_tables_net_ops);
0935d558 8584 cancel_work_sync(&trans_destroy_work);
1b1bc49c 8585 rcu_barrier();
4d44175a 8586 rhltable_destroy(&nft_objname_ht);
96518518 8587 nf_tables_core_module_exit();
96518518
PM		 8588}
8589
8590module_init(nf_tables_module_init);
8591module_exit(nf_tables_module_exit);
8592
8593MODULE_LICENSE("GPL");
8594MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8595MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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