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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>
13#include <linux/vmalloc.h>
14#include <linux/rhashtable.h>
15#include <linux/audit.h>
16#include <linux/netfilter.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_flow_table.h>
20#include <net/netfilter/nf_tables_core.h>
21#include <net/netfilter/nf_tables.h>
22#include <net/netfilter/nf_tables_offload.h>
23#include <net/net_namespace.h>
24#include <net/sock.h>
25
26#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
27
28unsigned int nf_tables_net_id __read_mostly;
29
30static LIST_HEAD(nf_tables_expressions);
31static LIST_HEAD(nf_tables_objects);
32static LIST_HEAD(nf_tables_flowtables);
33static LIST_HEAD(nf_tables_destroy_list);
34static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
35static u64 table_handle;
36
37enum {
38 NFT_VALIDATE_SKIP = 0,
39 NFT_VALIDATE_NEED,
40 NFT_VALIDATE_DO,
41};
42
43static struct rhltable nft_objname_ht;
44
45static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
46static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
47static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48
49static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
50static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
51static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52
53static const struct rhashtable_params nft_chain_ht_params = {
54 .head_offset = offsetof(struct nft_chain, rhlhead),
55 .key_offset = offsetof(struct nft_chain, name),
56 .hashfn = nft_chain_hash,
57 .obj_hashfn = nft_chain_hash_obj,
58 .obj_cmpfn = nft_chain_hash_cmp,
59 .automatic_shrinking = true,
60};
61
62static const struct rhashtable_params nft_objname_ht_params = {
63 .head_offset = offsetof(struct nft_object, rhlhead),
64 .key_offset = offsetof(struct nft_object, key),
65 .hashfn = nft_objname_hash,
66 .obj_hashfn = nft_objname_hash_obj,
67 .obj_cmpfn = nft_objname_hash_cmp,
68 .automatic_shrinking = true,
69};
70
71struct nft_audit_data {
72 struct nft_table *table;
73 int entries;
74 int op;
75 struct list_head list;
76};
77
78static const u8 nft2audit_op[NFT_MSG_MAX] = {
79 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
80 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
81 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
82 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
83 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
84 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
85 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
86 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
87 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
88 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
89 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
90 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
91 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
92 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
93 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
94 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
95 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
98 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
100 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
101 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
102 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
103 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
104};
105
106static void nft_validate_state_update(struct net *net, u8 new_validate_state)
107{
108 struct nftables_pernet *nft_net = nft_pernet(net);
109
110 switch (nft_net->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 break;
114 case NFT_VALIDATE_NEED:
115 break;
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
118 return;
119 }
120
121 nft_net->validate_state = new_validate_state;
122}
123static void nf_tables_trans_destroy_work(struct work_struct *w);
124static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
125
126static void nft_ctx_init(struct nft_ctx *ctx,
127 struct net *net,
128 const struct sk_buff *skb,
129 const struct nlmsghdr *nlh,
130 u8 family,
131 struct nft_table *table,
132 struct nft_chain *chain,
133 const struct nlattr * const *nla)
134{
135 ctx->net = net;
136 ctx->family = family;
137 ctx->level = 0;
138 ctx->table = table;
139 ctx->chain = chain;
140 ctx->nla = nla;
141 ctx->portid = NETLINK_CB(skb).portid;
142 ctx->report = nlmsg_report(nlh);
143 ctx->flags = nlh->nlmsg_flags;
144 ctx->seq = nlh->nlmsg_seq;
145}
146
147static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
148 int msg_type, u32 size, gfp_t gfp)
149{
150 struct nft_trans *trans;
151
152 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
153 if (trans == NULL)
154 return NULL;
155
156 trans->msg_type = msg_type;
157 trans->ctx = *ctx;
158
159 return trans;
160}
161
162static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
164{
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
166}
167
168static void nft_trans_destroy(struct nft_trans *trans)
169{
170 list_del(&trans->list);
171 kfree(trans);
172}
173
174static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
175{
176 struct nftables_pernet *nft_net;
177 struct net *net = ctx->net;
178 struct nft_trans *trans;
179
180 if (!nft_set_is_anonymous(set))
181 return;
182
183 nft_net = nft_pernet(net);
184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
185 switch (trans->msg_type) {
186 case NFT_MSG_NEWSET:
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
189 break;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
193 break;
194 }
195 }
196}
197
198static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
200{
201 struct nft_hook *hook;
202 int err, j;
203
204 j = 0;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
207 if (err < 0)
208 goto err_register;
209
210 j++;
211 }
212 return 0;
213
214err_register:
215 list_for_each_entry(hook, hook_list, list) {
216 if (j-- <= 0)
217 break;
218
219 nf_unregister_net_hook(net, &hook->ops);
220 }
221 return err;
222}
223
224static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list)
226{
227 struct nft_hook *hook;
228
229 list_for_each_entry(hook, hook_list, list)
230 nf_unregister_net_hook(net, &hook->ops);
231}
232
233static int nf_tables_register_hook(struct net *net,
234 const struct nft_table *table,
235 struct nft_chain *chain)
236{
237 struct nft_base_chain *basechain;
238 const struct nf_hook_ops *ops;
239
240 if (table->flags & NFT_TABLE_F_DORMANT ||
241 !nft_is_base_chain(chain))
242 return 0;
243
244 basechain = nft_base_chain(chain);
245 ops = &basechain->ops;
246
247 if (basechain->type->ops_register)
248 return basechain->type->ops_register(net, ops);
249
250 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
251 return nft_netdev_register_hooks(net, &basechain->hook_list);
252
253 return nf_register_net_hook(net, &basechain->ops);
254}
255
256static void nf_tables_unregister_hook(struct net *net,
257 const struct nft_table *table,
258 struct nft_chain *chain)
259{
260 struct nft_base_chain *basechain;
261 const struct nf_hook_ops *ops;
262
263 if (table->flags & NFT_TABLE_F_DORMANT ||
264 !nft_is_base_chain(chain))
265 return;
266 basechain = nft_base_chain(chain);
267 ops = &basechain->ops;
268
269 if (basechain->type->ops_unregister)
270 return basechain->type->ops_unregister(net, ops);
271
272 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
273 nft_netdev_unregister_hooks(net, &basechain->hook_list);
274 else
275 nf_unregister_net_hook(net, &basechain->ops);
276}
277
278static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
279{
280 struct nftables_pernet *nft_net = nft_pernet(net);
281
282 list_add_tail(&trans->list, &nft_net->commit_list);
283}
284
285static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
286{
287 struct nft_trans *trans;
288
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
290 if (trans == NULL)
291 return -ENOMEM;
292
293 if (msg_type == NFT_MSG_NEWTABLE)
294 nft_activate_next(ctx->net, ctx->table);
295
296 nft_trans_commit_list_add_tail(ctx->net, trans);
297 return 0;
298}
299
300static int nft_deltable(struct nft_ctx *ctx)
301{
302 int err;
303
304 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
305 if (err < 0)
306 return err;
307
308 nft_deactivate_next(ctx->net, ctx->table);
309 return err;
310}
311
312static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
313{
314 struct nft_trans *trans;
315
316 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
317 if (trans == NULL)
318 return ERR_PTR(-ENOMEM);
319
320 if (msg_type == NFT_MSG_NEWCHAIN) {
321 nft_activate_next(ctx->net, ctx->chain);
322
323 if (ctx->nla[NFTA_CHAIN_ID]) {
324 nft_trans_chain_id(trans) =
325 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
326 }
327 }
328
329 nft_trans_commit_list_add_tail(ctx->net, trans);
330 return trans;
331}
332
333static int nft_delchain(struct nft_ctx *ctx)
334{
335 struct nft_trans *trans;
336
337 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
338 if (IS_ERR(trans))
339 return PTR_ERR(trans);
340
341 ctx->table->use--;
342 nft_deactivate_next(ctx->net, ctx->chain);
343
344 return 0;
345}
346
347static void nft_rule_expr_activate(const struct nft_ctx *ctx,
348 struct nft_rule *rule)
349{
350 struct nft_expr *expr;
351
352 expr = nft_expr_first(rule);
353 while (nft_expr_more(rule, expr)) {
354 if (expr->ops->activate)
355 expr->ops->activate(ctx, expr);
356
357 expr = nft_expr_next(expr);
358 }
359}
360
361static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
362 struct nft_rule *rule,
363 enum nft_trans_phase phase)
364{
365 struct nft_expr *expr;
366
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->deactivate)
370 expr->ops->deactivate(ctx, expr, phase);
371
372 expr = nft_expr_next(expr);
373 }
374}
375
376static int
377nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
378{
379
380 if (nft_is_active_next(ctx->net, rule)) {
381 nft_deactivate_next(ctx->net, rule);
382 ctx->chain->use--;
383 return 0;
384 }
385 return -ENOENT;
386}
387
388static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
389 struct nft_rule *rule)
390{
391 struct nft_trans *trans;
392
393 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
394 if (trans == NULL)
395 return NULL;
396
397 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
398 nft_trans_rule_id(trans) =
399 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
400 }
401 nft_trans_rule(trans) = rule;
402 nft_trans_commit_list_add_tail(ctx->net, trans);
403
404 return trans;
405}
406
407static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
408{
409 struct nft_flow_rule *flow;
410 struct nft_trans *trans;
411 int err;
412
413 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
414 if (trans == NULL)
415 return -ENOMEM;
416
417 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
418 flow = nft_flow_rule_create(ctx->net, rule);
419 if (IS_ERR(flow)) {
420 nft_trans_destroy(trans);
421 return PTR_ERR(flow);
422 }
423
424 nft_trans_flow_rule(trans) = flow;
425 }
426
427 err = nf_tables_delrule_deactivate(ctx, rule);
428 if (err < 0) {
429 nft_trans_destroy(trans);
430 return err;
431 }
432 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
433
434 return 0;
435}
436
437static int nft_delrule_by_chain(struct nft_ctx *ctx)
438{
439 struct nft_rule *rule;
440 int err;
441
442 list_for_each_entry(rule, &ctx->chain->rules, list) {
443 if (!nft_is_active_next(ctx->net, rule))
444 continue;
445
446 err = nft_delrule(ctx, rule);
447 if (err < 0)
448 return err;
449 }
450 return 0;
451}
452
453static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
454 struct nft_set *set)
455{
456 struct nft_trans *trans;
457
458 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
459 if (trans == NULL)
460 return -ENOMEM;
461
462 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
463 nft_trans_set_id(trans) =
464 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
465 nft_activate_next(ctx->net, set);
466 }
467 nft_trans_set(trans) = set;
468 nft_trans_commit_list_add_tail(ctx->net, trans);
469
470 return 0;
471}
472
473static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
474{
475 int err;
476
477 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
478 if (err < 0)
479 return err;
480
481 nft_deactivate_next(ctx->net, set);
482 ctx->table->use--;
483
484 return err;
485}
486
487static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
488 struct nft_object *obj)
489{
490 struct nft_trans *trans;
491
492 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
493 if (trans == NULL)
494 return -ENOMEM;
495
496 if (msg_type == NFT_MSG_NEWOBJ)
497 nft_activate_next(ctx->net, obj);
498
499 nft_trans_obj(trans) = obj;
500 nft_trans_commit_list_add_tail(ctx->net, trans);
501
502 return 0;
503}
504
505static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
506{
507 int err;
508
509 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
510 if (err < 0)
511 return err;
512
513 nft_deactivate_next(ctx->net, obj);
514 ctx->table->use--;
515
516 return err;
517}
518
519static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
520 struct nft_flowtable *flowtable)
521{
522 struct nft_trans *trans;
523
524 trans = nft_trans_alloc(ctx, msg_type,
525 sizeof(struct nft_trans_flowtable));
526 if (trans == NULL)
527 return -ENOMEM;
528
529 if (msg_type == NFT_MSG_NEWFLOWTABLE)
530 nft_activate_next(ctx->net, flowtable);
531
532 nft_trans_flowtable(trans) = flowtable;
533 nft_trans_commit_list_add_tail(ctx->net, trans);
534
535 return 0;
536}
537
538static int nft_delflowtable(struct nft_ctx *ctx,
539 struct nft_flowtable *flowtable)
540{
541 int err;
542
543 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
544 if (err < 0)
545 return err;
546
547 nft_deactivate_next(ctx->net, flowtable);
548 ctx->table->use--;
549
550 return err;
551}
552
553
554
555
556
557static struct nft_table *nft_table_lookup(const struct net *net,
558 const struct nlattr *nla,
559 u8 family, u8 genmask, u32 nlpid)
560{
561 struct nftables_pernet *nft_net;
562 struct nft_table *table;
563
564 if (nla == NULL)
565 return ERR_PTR(-EINVAL);
566
567 nft_net = nft_pernet(net);
568 list_for_each_entry_rcu(table, &nft_net->tables, list,
569 lockdep_is_held(&nft_net->commit_mutex)) {
570 if (!nla_strcmp(nla, table->name) &&
571 table->family == family &&
572 nft_active_genmask(table, genmask)) {
573 if (nft_table_has_owner(table) &&
574 nlpid && table->nlpid != nlpid)
575 return ERR_PTR(-EPERM);
576
577 return table;
578 }
579 }
580
581 return ERR_PTR(-ENOENT);
582}
583
584static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
585 const struct nlattr *nla,
586 u8 genmask, u32 nlpid)
587{
588 struct nftables_pernet *nft_net;
589 struct nft_table *table;
590
591 nft_net = nft_pernet(net);
592 list_for_each_entry(table, &nft_net->tables, list) {
593 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
594 nft_active_genmask(table, genmask)) {
595 if (nft_table_has_owner(table) &&
596 nlpid && table->nlpid != nlpid)
597 return ERR_PTR(-EPERM);
598
599 return table;
600 }
601 }
602
603 return ERR_PTR(-ENOENT);
604}
605
606static inline u64 nf_tables_alloc_handle(struct nft_table *table)
607{
608 return ++table->hgenerator;
609}
610
611static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
612
613static const struct nft_chain_type *
614__nft_chain_type_get(u8 family, enum nft_chain_types type)
615{
616 if (family >= NFPROTO_NUMPROTO ||
617 type >= NFT_CHAIN_T_MAX)
618 return NULL;
619
620 return chain_type[family][type];
621}
622
623static const struct nft_chain_type *
624__nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
625{
626 const struct nft_chain_type *type;
627 int i;
628
629 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
630 type = __nft_chain_type_get(family, i);
631 if (!type)
632 continue;
633 if (!nla_strcmp(nla, type->name))
634 return type;
635 }
636 return NULL;
637}
638
639struct nft_module_request {
640 struct list_head list;
641 char module[MODULE_NAME_LEN];
642 bool done;
643};
644
645#ifdef CONFIG_MODULES
646__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
647 ...)
648{
649 char module_name[MODULE_NAME_LEN];
650 struct nftables_pernet *nft_net;
651 struct nft_module_request *req;
652 va_list args;
653 int ret;
654
655 va_start(args, fmt);
656 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
657 va_end(args);
658 if (ret >= MODULE_NAME_LEN)
659 return 0;
660
661 nft_net = nft_pernet(net);
662 list_for_each_entry(req, &nft_net->module_list, list) {
663 if (!strcmp(req->module, module_name)) {
664 if (req->done)
665 return 0;
666
667
668 return -EAGAIN;
669 }
670 }
671
672 req = kmalloc(sizeof(*req), GFP_KERNEL);
673 if (!req)
674 return -ENOMEM;
675
676 req->done = false;
677 strlcpy(req->module, module_name, MODULE_NAME_LEN);
678 list_add_tail(&req->list, &nft_net->module_list);
679
680 return -EAGAIN;
681}
682EXPORT_SYMBOL_GPL(nft_request_module);
683#endif
684
685static void lockdep_nfnl_nft_mutex_not_held(void)
686{
687#ifdef CONFIG_PROVE_LOCKING
688 if (debug_locks)
689 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
690#endif
691}
692
693static const struct nft_chain_type *
694nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
695 u8 family, bool autoload)
696{
697 const struct nft_chain_type *type;
698
699 type = __nf_tables_chain_type_lookup(nla, family);
700 if (type != NULL)
701 return type;
702
703 lockdep_nfnl_nft_mutex_not_held();
704#ifdef CONFIG_MODULES
705 if (autoload) {
706 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
707 nla_len(nla),
708 (const char *)nla_data(nla)) == -EAGAIN)
709 return ERR_PTR(-EAGAIN);
710 }
711#endif
712 return ERR_PTR(-ENOENT);
713}
714
715static __be16 nft_base_seq(const struct net *net)
716{
717 struct nftables_pernet *nft_net = nft_pernet(net);
718
719 return htons(nft_net->base_seq & 0xffff);
720}
721
722static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
723 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
724 .len = NFT_TABLE_MAXNAMELEN - 1 },
725 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
726 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
727 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
728 .len = NFT_USERDATA_MAXLEN }
729};
730
731static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
732 u32 portid, u32 seq, int event, u32 flags,
733 int family, const struct nft_table *table)
734{
735 struct nlmsghdr *nlh;
736
737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
738 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
739 NFNETLINK_V0, nft_base_seq(net));
740 if (!nlh)
741 goto nla_put_failure;
742
743 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
744 nla_put_be32(skb, NFTA_TABLE_FLAGS,
745 htonl(table->flags & NFT_TABLE_F_MASK)) ||
746 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
747 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
748 NFTA_TABLE_PAD))
749 goto nla_put_failure;
750 if (nft_table_has_owner(table) &&
751 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
752 goto nla_put_failure;
753
754 if (table->udata) {
755 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
756 goto nla_put_failure;
757 }
758
759 nlmsg_end(skb, nlh);
760 return 0;
761
762nla_put_failure:
763 nlmsg_trim(skb, nlh);
764 return -1;
765}
766
767struct nftnl_skb_parms {
768 bool report;
769};
770#define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
771
772static void nft_notify_enqueue(struct sk_buff *skb, bool report,
773 struct list_head *notify_list)
774{
775 NFT_CB(skb).report = report;
776 list_add_tail(&skb->list, notify_list);
777}
778
779static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
780{
781 struct nftables_pernet *nft_net;
782 struct sk_buff *skb;
783 int err;
784
785 if (!ctx->report &&
786 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
787 return;
788
789 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
790 if (skb == NULL)
791 goto err;
792
793 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
794 event, 0, ctx->family, ctx->table);
795 if (err < 0) {
796 kfree_skb(skb);
797 goto err;
798 }
799
800 nft_net = nft_pernet(ctx->net);
801 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
802 return;
803err:
804 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
805}
806
807static int nf_tables_dump_tables(struct sk_buff *skb,
808 struct netlink_callback *cb)
809{
810 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
811 struct nftables_pernet *nft_net;
812 const struct nft_table *table;
813 unsigned int idx = 0, s_idx = cb->args[0];
814 struct net *net = sock_net(skb->sk);
815 int family = nfmsg->nfgen_family;
816
817 rcu_read_lock();
818 nft_net = nft_pernet(net);
819 cb->seq = nft_net->base_seq;
820
821 list_for_each_entry_rcu(table, &nft_net->tables, list) {
822 if (family != NFPROTO_UNSPEC && family != table->family)
823 continue;
824
825 if (idx < s_idx)
826 goto cont;
827 if (idx > s_idx)
828 memset(&cb->args[1], 0,
829 sizeof(cb->args) - sizeof(cb->args[0]));
830 if (!nft_is_active(net, table))
831 continue;
832 if (nf_tables_fill_table_info(skb, net,
833 NETLINK_CB(cb->skb).portid,
834 cb->nlh->nlmsg_seq,
835 NFT_MSG_NEWTABLE, NLM_F_MULTI,
836 table->family, table) < 0)
837 goto done;
838
839 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
840cont:
841 idx++;
842 }
843done:
844 rcu_read_unlock();
845 cb->args[0] = idx;
846 return skb->len;
847}
848
849static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
850 const struct nlmsghdr *nlh,
851 struct netlink_dump_control *c)
852{
853 int err;
854
855 if (!try_module_get(THIS_MODULE))
856 return -EINVAL;
857
858 rcu_read_unlock();
859 err = netlink_dump_start(nlsk, skb, nlh, c);
860 rcu_read_lock();
861 module_put(THIS_MODULE);
862
863 return err;
864}
865
866
867static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
868 const struct nlattr * const nla[])
869{
870 struct netlink_ext_ack *extack = info->extack;
871 u8 genmask = nft_genmask_cur(info->net);
872 u8 family = info->nfmsg->nfgen_family;
873 const struct nft_table *table;
874 struct net *net = info->net;
875 struct sk_buff *skb2;
876 int err;
877
878 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
879 struct netlink_dump_control c = {
880 .dump = nf_tables_dump_tables,
881 .module = THIS_MODULE,
882 };
883
884 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
885 }
886
887 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
888 if (IS_ERR(table)) {
889 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
890 return PTR_ERR(table);
891 }
892
893 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
894 if (!skb2)
895 return -ENOMEM;
896
897 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
898 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
899 0, family, table);
900 if (err < 0)
901 goto err_fill_table_info;
902
903 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
904
905err_fill_table_info:
906 kfree_skb(skb2);
907 return err;
908}
909
910static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
911{
912 struct nft_chain *chain;
913 u32 i = 0;
914
915 list_for_each_entry(chain, &table->chains, list) {
916 if (!nft_is_active_next(net, chain))
917 continue;
918 if (!nft_is_base_chain(chain))
919 continue;
920
921 if (cnt && i++ == cnt)
922 break;
923
924 nf_tables_unregister_hook(net, table, chain);
925 }
926}
927
928static int nf_tables_table_enable(struct net *net, struct nft_table *table)
929{
930 struct nft_chain *chain;
931 int err, i = 0;
932
933 list_for_each_entry(chain, &table->chains, list) {
934 if (!nft_is_active_next(net, chain))
935 continue;
936 if (!nft_is_base_chain(chain))
937 continue;
938
939 err = nf_tables_register_hook(net, table, chain);
940 if (err < 0)
941 goto err_register_hooks;
942
943 i++;
944 }
945 return 0;
946
947err_register_hooks:
948 if (i)
949 nft_table_disable(net, table, i);
950 return err;
951}
952
953static void nf_tables_table_disable(struct net *net, struct nft_table *table)
954{
955 table->flags &= ~NFT_TABLE_F_DORMANT;
956 nft_table_disable(net, table, 0);
957 table->flags |= NFT_TABLE_F_DORMANT;
958}
959
960#define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
961#define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
962#define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
963#define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
964 __NFT_TABLE_F_WAS_AWAKEN)
965
966static int nf_tables_updtable(struct nft_ctx *ctx)
967{
968 struct nft_trans *trans;
969 u32 flags;
970 int ret;
971
972 if (!ctx->nla[NFTA_TABLE_FLAGS])
973 return 0;
974
975 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
976 if (flags & ~NFT_TABLE_F_MASK)
977 return -EOPNOTSUPP;
978
979 if (flags == ctx->table->flags)
980 return 0;
981
982 if ((nft_table_has_owner(ctx->table) &&
983 !(flags & NFT_TABLE_F_OWNER)) ||
984 (!nft_table_has_owner(ctx->table) &&
985 flags & NFT_TABLE_F_OWNER))
986 return -EOPNOTSUPP;
987
988 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
989 sizeof(struct nft_trans_table));
990 if (trans == NULL)
991 return -ENOMEM;
992
993 if ((flags & NFT_TABLE_F_DORMANT) &&
994 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
995 ctx->table->flags |= NFT_TABLE_F_DORMANT;
996 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
997 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
998 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
999 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1000 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1001 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1002 ret = nf_tables_table_enable(ctx->net, ctx->table);
1003 if (ret < 0)
1004 goto err_register_hooks;
1005
1006 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1007 }
1008 }
1009
1010 nft_trans_table_update(trans) = true;
1011 nft_trans_commit_list_add_tail(ctx->net, trans);
1012
1013 return 0;
1014
1015err_register_hooks:
1016 nft_trans_destroy(trans);
1017 return ret;
1018}
1019
1020static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1021{
1022 const char *name = data;
1023
1024 return jhash(name, strlen(name), seed);
1025}
1026
1027static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1028{
1029 const struct nft_chain *chain = data;
1030
1031 return nft_chain_hash(chain->name, 0, seed);
1032}
1033
1034static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1035 const void *ptr)
1036{
1037 const struct nft_chain *chain = ptr;
1038 const char *name = arg->key;
1039
1040 return strcmp(chain->name, name);
1041}
1042
1043static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1044{
1045 const struct nft_object_hash_key *k = data;
1046
1047 seed ^= hash_ptr(k->table, 32);
1048
1049 return jhash(k->name, strlen(k->name), seed);
1050}
1051
1052static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1053{
1054 const struct nft_object *obj = data;
1055
1056 return nft_objname_hash(&obj->key, 0, seed);
1057}
1058
1059static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1060 const void *ptr)
1061{
1062 const struct nft_object_hash_key *k = arg->key;
1063 const struct nft_object *obj = ptr;
1064
1065 if (obj->key.table != k->table)
1066 return -1;
1067
1068 return strcmp(obj->key.name, k->name);
1069}
1070
1071static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1072 const struct nlattr * const nla[])
1073{
1074 struct nftables_pernet *nft_net = nft_pernet(info->net);
1075 struct netlink_ext_ack *extack = info->extack;
1076 u8 genmask = nft_genmask_next(info->net);
1077 u8 family = info->nfmsg->nfgen_family;
1078 struct net *net = info->net;
1079 const struct nlattr *attr;
1080 struct nft_table *table;
1081 struct nft_ctx ctx;
1082 u32 flags = 0;
1083 int err;
1084
1085 lockdep_assert_held(&nft_net->commit_mutex);
1086 attr = nla[NFTA_TABLE_NAME];
1087 table = nft_table_lookup(net, attr, family, genmask,
1088 NETLINK_CB(skb).portid);
1089 if (IS_ERR(table)) {
1090 if (PTR_ERR(table) != -ENOENT)
1091 return PTR_ERR(table);
1092 } else {
1093 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1094 NL_SET_BAD_ATTR(extack, attr);
1095 return -EEXIST;
1096 }
1097 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1098 return -EOPNOTSUPP;
1099
1100 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1101
1102 return nf_tables_updtable(&ctx);
1103 }
1104
1105 if (nla[NFTA_TABLE_FLAGS]) {
1106 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1107 if (flags & ~NFT_TABLE_F_MASK)
1108 return -EOPNOTSUPP;
1109 }
1110
1111 err = -ENOMEM;
1112 table = kzalloc(sizeof(*table), GFP_KERNEL);
1113 if (table == NULL)
1114 goto err_kzalloc;
1115
1116 table->name = nla_strdup(attr, GFP_KERNEL);
1117 if (table->name == NULL)
1118 goto err_strdup;
1119
1120 if (nla[NFTA_TABLE_USERDATA]) {
1121 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1122 if (table->udata == NULL)
1123 goto err_table_udata;
1124
1125 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1126 }
1127
1128 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1129 if (err)
1130 goto err_chain_ht;
1131
1132 INIT_LIST_HEAD(&table->chains);
1133 INIT_LIST_HEAD(&table->sets);
1134 INIT_LIST_HEAD(&table->objects);
1135 INIT_LIST_HEAD(&table->flowtables);
1136 table->family = family;
1137 table->flags = flags;
1138 table->handle = ++table_handle;
1139 if (table->flags & NFT_TABLE_F_OWNER)
1140 table->nlpid = NETLINK_CB(skb).portid;
1141
1142 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1143 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1144 if (err < 0)
1145 goto err_trans;
1146
1147 list_add_tail_rcu(&table->list, &nft_net->tables);
1148 return 0;
1149err_trans:
1150 rhltable_destroy(&table->chains_ht);
1151err_chain_ht:
1152 kfree(table->udata);
1153err_table_udata:
1154 kfree(table->name);
1155err_strdup:
1156 kfree(table);
1157err_kzalloc:
1158 return err;
1159}
1160
1161static int nft_flush_table(struct nft_ctx *ctx)
1162{
1163 struct nft_flowtable *flowtable, *nft;
1164 struct nft_chain *chain, *nc;
1165 struct nft_object *obj, *ne;
1166 struct nft_set *set, *ns;
1167 int err;
1168
1169 list_for_each_entry(chain, &ctx->table->chains, list) {
1170 if (!nft_is_active_next(ctx->net, chain))
1171 continue;
1172
1173 if (nft_chain_is_bound(chain))
1174 continue;
1175
1176 ctx->chain = chain;
1177
1178 err = nft_delrule_by_chain(ctx);
1179 if (err < 0)
1180 goto out;
1181 }
1182
1183 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1184 if (!nft_is_active_next(ctx->net, set))
1185 continue;
1186
1187 if (nft_set_is_anonymous(set) &&
1188 !list_empty(&set->bindings))
1189 continue;
1190
1191 err = nft_delset(ctx, set);
1192 if (err < 0)
1193 goto out;
1194 }
1195
1196 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1197 if (!nft_is_active_next(ctx->net, flowtable))
1198 continue;
1199
1200 err = nft_delflowtable(ctx, flowtable);
1201 if (err < 0)
1202 goto out;
1203 }
1204
1205 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1206 if (!nft_is_active_next(ctx->net, obj))
1207 continue;
1208
1209 err = nft_delobj(ctx, obj);
1210 if (err < 0)
1211 goto out;
1212 }
1213
1214 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1215 if (!nft_is_active_next(ctx->net, chain))
1216 continue;
1217
1218 if (nft_chain_is_bound(chain))
1219 continue;
1220
1221 ctx->chain = chain;
1222
1223 err = nft_delchain(ctx);
1224 if (err < 0)
1225 goto out;
1226 }
1227
1228 err = nft_deltable(ctx);
1229out:
1230 return err;
1231}
1232
1233static int nft_flush(struct nft_ctx *ctx, int family)
1234{
1235 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1236 const struct nlattr * const *nla = ctx->nla;
1237 struct nft_table *table, *nt;
1238 int err = 0;
1239
1240 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1241 if (family != AF_UNSPEC && table->family != family)
1242 continue;
1243
1244 ctx->family = table->family;
1245
1246 if (!nft_is_active_next(ctx->net, table))
1247 continue;
1248
1249 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1250 continue;
1251
1252 if (nla[NFTA_TABLE_NAME] &&
1253 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1254 continue;
1255
1256 ctx->table = table;
1257
1258 err = nft_flush_table(ctx);
1259 if (err < 0)
1260 goto out;
1261 }
1262out:
1263 return err;
1264}
1265
1266static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1267 const struct nlattr * const nla[])
1268{
1269 struct netlink_ext_ack *extack = info->extack;
1270 u8 genmask = nft_genmask_next(info->net);
1271 u8 family = info->nfmsg->nfgen_family;
1272 struct net *net = info->net;
1273 const struct nlattr *attr;
1274 struct nft_table *table;
1275 struct nft_ctx ctx;
1276
1277 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1278 if (family == AF_UNSPEC ||
1279 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1280 return nft_flush(&ctx, family);
1281
1282 if (nla[NFTA_TABLE_HANDLE]) {
1283 attr = nla[NFTA_TABLE_HANDLE];
1284 table = nft_table_lookup_byhandle(net, attr, genmask,
1285 NETLINK_CB(skb).portid);
1286 } else {
1287 attr = nla[NFTA_TABLE_NAME];
1288 table = nft_table_lookup(net, attr, family, genmask,
1289 NETLINK_CB(skb).portid);
1290 }
1291
1292 if (IS_ERR(table)) {
1293 NL_SET_BAD_ATTR(extack, attr);
1294 return PTR_ERR(table);
1295 }
1296
1297 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1298 table->use > 0)
1299 return -EBUSY;
1300
1301 ctx.family = family;
1302 ctx.table = table;
1303
1304 return nft_flush_table(&ctx);
1305}
1306
1307static void nf_tables_table_destroy(struct nft_ctx *ctx)
1308{
1309 if (WARN_ON(ctx->table->use > 0))
1310 return;
1311
1312 rhltable_destroy(&ctx->table->chains_ht);
1313 kfree(ctx->table->name);
1314 kfree(ctx->table->udata);
1315 kfree(ctx->table);
1316}
1317
1318void nft_register_chain_type(const struct nft_chain_type *ctype)
1319{
1320 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1321 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1322 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1323 return;
1324 }
1325 chain_type[ctype->family][ctype->type] = ctype;
1326 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1327}
1328EXPORT_SYMBOL_GPL(nft_register_chain_type);
1329
1330void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1331{
1332 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1333 chain_type[ctype->family][ctype->type] = NULL;
1334 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1335}
1336EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1337
1338
1339
1340
1341
1342static struct nft_chain *
1343nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1344{
1345 struct nft_chain *chain;
1346
1347 list_for_each_entry(chain, &table->chains, list) {
1348 if (chain->handle == handle &&
1349 nft_active_genmask(chain, genmask))
1350 return chain;
1351 }
1352
1353 return ERR_PTR(-ENOENT);
1354}
1355
1356static bool lockdep_commit_lock_is_held(const struct net *net)
1357{
1358#ifdef CONFIG_PROVE_LOCKING
1359 struct nftables_pernet *nft_net = nft_pernet(net);
1360
1361 return lockdep_is_held(&nft_net->commit_mutex);
1362#else
1363 return true;
1364#endif
1365}
1366
1367static struct nft_chain *nft_chain_lookup(struct net *net,
1368 struct nft_table *table,
1369 const struct nlattr *nla, u8 genmask)
1370{
1371 char search[NFT_CHAIN_MAXNAMELEN + 1];
1372 struct rhlist_head *tmp, *list;
1373 struct nft_chain *chain;
1374
1375 if (nla == NULL)
1376 return ERR_PTR(-EINVAL);
1377
1378 nla_strscpy(search, nla, sizeof(search));
1379
1380 WARN_ON(!rcu_read_lock_held() &&
1381 !lockdep_commit_lock_is_held(net));
1382
1383 chain = ERR_PTR(-ENOENT);
1384 rcu_read_lock();
1385 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1386 if (!list)
1387 goto out_unlock;
1388
1389 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1390 if (nft_active_genmask(chain, genmask))
1391 goto out_unlock;
1392 }
1393 chain = ERR_PTR(-ENOENT);
1394out_unlock:
1395 rcu_read_unlock();
1396 return chain;
1397}
1398
1399static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1400 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1401 .len = NFT_TABLE_MAXNAMELEN - 1 },
1402 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1403 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1404 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1405 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1406 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1407 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1408 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1409 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1410 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1411 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1412 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1413 .len = NFT_USERDATA_MAXLEN },
1414};
1415
1416static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1417 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1418 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1419 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1420 .len = IFNAMSIZ - 1 },
1421};
1422
1423static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1424{
1425 struct nft_stats *cpu_stats, total;
1426 struct nlattr *nest;
1427 unsigned int seq;
1428 u64 pkts, bytes;
1429 int cpu;
1430
1431 if (!stats)
1432 return 0;
1433
1434 memset(&total, 0, sizeof(total));
1435 for_each_possible_cpu(cpu) {
1436 cpu_stats = per_cpu_ptr(stats, cpu);
1437 do {
1438 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1439 pkts = cpu_stats->pkts;
1440 bytes = cpu_stats->bytes;
1441 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1442 total.pkts += pkts;
1443 total.bytes += bytes;
1444 }
1445 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1446 if (nest == NULL)
1447 goto nla_put_failure;
1448
1449 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1450 NFTA_COUNTER_PAD) ||
1451 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1452 NFTA_COUNTER_PAD))
1453 goto nla_put_failure;
1454
1455 nla_nest_end(skb, nest);
1456 return 0;
1457
1458nla_put_failure:
1459 return -ENOSPC;
1460}
1461
1462static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1463 const struct nft_base_chain *basechain)
1464{
1465 const struct nf_hook_ops *ops = &basechain->ops;
1466 struct nft_hook *hook, *first = NULL;
1467 struct nlattr *nest, *nest_devs;
1468 int n = 0;
1469
1470 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1471 if (nest == NULL)
1472 goto nla_put_failure;
1473 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1474 goto nla_put_failure;
1475 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1476 goto nla_put_failure;
1477
1478 if (nft_base_chain_netdev(family, ops->hooknum)) {
1479 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1480 list_for_each_entry(hook, &basechain->hook_list, list) {
1481 if (!first)
1482 first = hook;
1483
1484 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1485 hook->ops.dev->name))
1486 goto nla_put_failure;
1487 n++;
1488 }
1489 nla_nest_end(skb, nest_devs);
1490
1491 if (n == 1 &&
1492 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1493 goto nla_put_failure;
1494 }
1495 nla_nest_end(skb, nest);
1496
1497 return 0;
1498nla_put_failure:
1499 return -1;
1500}
1501
1502static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1503 u32 portid, u32 seq, int event, u32 flags,
1504 int family, const struct nft_table *table,
1505 const struct nft_chain *chain)
1506{
1507 struct nlmsghdr *nlh;
1508
1509 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1510 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1511 NFNETLINK_V0, nft_base_seq(net));
1512 if (!nlh)
1513 goto nla_put_failure;
1514
1515 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1516 goto nla_put_failure;
1517 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1518 NFTA_CHAIN_PAD))
1519 goto nla_put_failure;
1520 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1521 goto nla_put_failure;
1522
1523 if (nft_is_base_chain(chain)) {
1524 const struct nft_base_chain *basechain = nft_base_chain(chain);
1525 struct nft_stats __percpu *stats;
1526
1527 if (nft_dump_basechain_hook(skb, family, basechain))
1528 goto nla_put_failure;
1529
1530 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1531 htonl(basechain->policy)))
1532 goto nla_put_failure;
1533
1534 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1535 goto nla_put_failure;
1536
1537 stats = rcu_dereference_check(basechain->stats,
1538 lockdep_commit_lock_is_held(net));
1539 if (nft_dump_stats(skb, stats))
1540 goto nla_put_failure;
1541 }
1542
1543 if (chain->flags &&
1544 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1545 goto nla_put_failure;
1546
1547 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1548 goto nla_put_failure;
1549
1550 if (chain->udata &&
1551 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1552 goto nla_put_failure;
1553
1554 nlmsg_end(skb, nlh);
1555 return 0;
1556
1557nla_put_failure:
1558 nlmsg_trim(skb, nlh);
1559 return -1;
1560}
1561
1562static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1563{
1564 struct nftables_pernet *nft_net;
1565 struct sk_buff *skb;
1566 int err;
1567
1568 if (!ctx->report &&
1569 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1570 return;
1571
1572 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1573 if (skb == NULL)
1574 goto err;
1575
1576 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1577 event, 0, ctx->family, ctx->table,
1578 ctx->chain);
1579 if (err < 0) {
1580 kfree_skb(skb);
1581 goto err;
1582 }
1583
1584 nft_net = nft_pernet(ctx->net);
1585 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1586 return;
1587err:
1588 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1589}
1590
1591static int nf_tables_dump_chains(struct sk_buff *skb,
1592 struct netlink_callback *cb)
1593{
1594 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1595 unsigned int idx = 0, s_idx = cb->args[0];
1596 struct net *net = sock_net(skb->sk);
1597 int family = nfmsg->nfgen_family;
1598 struct nftables_pernet *nft_net;
1599 const struct nft_table *table;
1600 const struct nft_chain *chain;
1601
1602 rcu_read_lock();
1603 nft_net = nft_pernet(net);
1604 cb->seq = nft_net->base_seq;
1605
1606 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1607 if (family != NFPROTO_UNSPEC && family != table->family)
1608 continue;
1609
1610 list_for_each_entry_rcu(chain, &table->chains, list) {
1611 if (idx < s_idx)
1612 goto cont;
1613 if (idx > s_idx)
1614 memset(&cb->args[1], 0,
1615 sizeof(cb->args) - sizeof(cb->args[0]));
1616 if (!nft_is_active(net, chain))
1617 continue;
1618 if (nf_tables_fill_chain_info(skb, net,
1619 NETLINK_CB(cb->skb).portid,
1620 cb->nlh->nlmsg_seq,
1621 NFT_MSG_NEWCHAIN,
1622 NLM_F_MULTI,
1623 table->family, table,
1624 chain) < 0)
1625 goto done;
1626
1627 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1628cont:
1629 idx++;
1630 }
1631 }
1632done:
1633 rcu_read_unlock();
1634 cb->args[0] = idx;
1635 return skb->len;
1636}
1637
1638
1639static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1640 const struct nlattr * const nla[])
1641{
1642 struct netlink_ext_ack *extack = info->extack;
1643 u8 genmask = nft_genmask_cur(info->net);
1644 u8 family = info->nfmsg->nfgen_family;
1645 const struct nft_chain *chain;
1646 struct net *net = info->net;
1647 struct nft_table *table;
1648 struct sk_buff *skb2;
1649 int err;
1650
1651 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1652 struct netlink_dump_control c = {
1653 .dump = nf_tables_dump_chains,
1654 .module = THIS_MODULE,
1655 };
1656
1657 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1658 }
1659
1660 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1661 if (IS_ERR(table)) {
1662 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1663 return PTR_ERR(table);
1664 }
1665
1666 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1667 if (IS_ERR(chain)) {
1668 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1669 return PTR_ERR(chain);
1670 }
1671
1672 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1673 if (!skb2)
1674 return -ENOMEM;
1675
1676 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1677 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1678 0, family, table, chain);
1679 if (err < 0)
1680 goto err_fill_chain_info;
1681
1682 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1683
1684err_fill_chain_info:
1685 kfree_skb(skb2);
1686 return err;
1687}
1688
1689static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1690 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1691 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1692};
1693
1694static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1695{
1696 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1697 struct nft_stats __percpu *newstats;
1698 struct nft_stats *stats;
1699 int err;
1700
1701 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1702 nft_counter_policy, NULL);
1703 if (err < 0)
1704 return ERR_PTR(err);
1705
1706 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1707 return ERR_PTR(-EINVAL);
1708
1709 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1710 if (newstats == NULL)
1711 return ERR_PTR(-ENOMEM);
1712
1713
1714
1715
1716 preempt_disable();
1717 stats = this_cpu_ptr(newstats);
1718 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1719 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1720 preempt_enable();
1721
1722 return newstats;
1723}
1724
1725static void nft_chain_stats_replace(struct nft_trans *trans)
1726{
1727 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1728
1729 if (!nft_trans_chain_stats(trans))
1730 return;
1731
1732 nft_trans_chain_stats(trans) =
1733 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1734 lockdep_commit_lock_is_held(trans->ctx.net));
1735
1736 if (!nft_trans_chain_stats(trans))
1737 static_branch_inc(&nft_counters_enabled);
1738}
1739
1740static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1741{
1742 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1743 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1744
1745 if (g0 != g1)
1746 kvfree(g1);
1747 kvfree(g0);
1748
1749
1750 WARN_ON_ONCE(chain->rules_next);
1751 kvfree(chain->rules_next);
1752}
1753
1754void nf_tables_chain_destroy(struct nft_ctx *ctx)
1755{
1756 struct nft_chain *chain = ctx->chain;
1757 struct nft_hook *hook, *next;
1758
1759 if (WARN_ON(chain->use > 0))
1760 return;
1761
1762
1763 nf_tables_chain_free_chain_rules(chain);
1764
1765 if (nft_is_base_chain(chain)) {
1766 struct nft_base_chain *basechain = nft_base_chain(chain);
1767
1768 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1769 list_for_each_entry_safe(hook, next,
1770 &basechain->hook_list, list) {
1771 list_del_rcu(&hook->list);
1772 kfree_rcu(hook, rcu);
1773 }
1774 }
1775 module_put(basechain->type->owner);
1776 if (rcu_access_pointer(basechain->stats)) {
1777 static_branch_dec(&nft_counters_enabled);
1778 free_percpu(rcu_dereference_raw(basechain->stats));
1779 }
1780 kfree(chain->name);
1781 kfree(chain->udata);
1782 kfree(basechain);
1783 } else {
1784 kfree(chain->name);
1785 kfree(chain->udata);
1786 kfree(chain);
1787 }
1788}
1789
1790static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1791 const struct nlattr *attr)
1792{
1793 struct net_device *dev;
1794 char ifname[IFNAMSIZ];
1795 struct nft_hook *hook;
1796 int err;
1797
1798 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1799 if (!hook) {
1800 err = -ENOMEM;
1801 goto err_hook_alloc;
1802 }
1803
1804 nla_strscpy(ifname, attr, IFNAMSIZ);
1805
1806
1807
1808
1809 dev = __dev_get_by_name(net, ifname);
1810 if (!dev) {
1811 err = -ENOENT;
1812 goto err_hook_dev;
1813 }
1814 hook->ops.dev = dev;
1815 hook->inactive = false;
1816
1817 return hook;
1818
1819err_hook_dev:
1820 kfree(hook);
1821err_hook_alloc:
1822 return ERR_PTR(err);
1823}
1824
1825static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1826 const struct nft_hook *this)
1827{
1828 struct nft_hook *hook;
1829
1830 list_for_each_entry(hook, hook_list, list) {
1831 if (this->ops.dev == hook->ops.dev)
1832 return hook;
1833 }
1834
1835 return NULL;
1836}
1837
1838static int nf_tables_parse_netdev_hooks(struct net *net,
1839 const struct nlattr *attr,
1840 struct list_head *hook_list)
1841{
1842 struct nft_hook *hook, *next;
1843 const struct nlattr *tmp;
1844 int rem, n = 0, err;
1845
1846 nla_for_each_nested(tmp, attr, rem) {
1847 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1848 err = -EINVAL;
1849 goto err_hook;
1850 }
1851
1852 hook = nft_netdev_hook_alloc(net, tmp);
1853 if (IS_ERR(hook)) {
1854 err = PTR_ERR(hook);
1855 goto err_hook;
1856 }
1857 if (nft_hook_list_find(hook_list, hook)) {
1858 kfree(hook);
1859 err = -EEXIST;
1860 goto err_hook;
1861 }
1862 list_add_tail(&hook->list, hook_list);
1863 n++;
1864
1865 if (n == NFT_NETDEVICE_MAX) {
1866 err = -EFBIG;
1867 goto err_hook;
1868 }
1869 }
1870
1871 return 0;
1872
1873err_hook:
1874 list_for_each_entry_safe(hook, next, hook_list, list) {
1875 list_del(&hook->list);
1876 kfree(hook);
1877 }
1878 return err;
1879}
1880
1881struct nft_chain_hook {
1882 u32 num;
1883 s32 priority;
1884 const struct nft_chain_type *type;
1885 struct list_head list;
1886};
1887
1888static int nft_chain_parse_netdev(struct net *net,
1889 struct nlattr *tb[],
1890 struct list_head *hook_list)
1891{
1892 struct nft_hook *hook;
1893 int err;
1894
1895 if (tb[NFTA_HOOK_DEV]) {
1896 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1897 if (IS_ERR(hook))
1898 return PTR_ERR(hook);
1899
1900 list_add_tail(&hook->list, hook_list);
1901 } else if (tb[NFTA_HOOK_DEVS]) {
1902 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1903 hook_list);
1904 if (err < 0)
1905 return err;
1906
1907 if (list_empty(hook_list))
1908 return -EINVAL;
1909 } else {
1910 return -EINVAL;
1911 }
1912
1913 return 0;
1914}
1915
1916static int nft_chain_parse_hook(struct net *net,
1917 const struct nlattr * const nla[],
1918 struct nft_chain_hook *hook, u8 family,
1919 struct netlink_ext_ack *extack, bool autoload)
1920{
1921 struct nftables_pernet *nft_net = nft_pernet(net);
1922 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1923 const struct nft_chain_type *type;
1924 int err;
1925
1926 lockdep_assert_held(&nft_net->commit_mutex);
1927 lockdep_nfnl_nft_mutex_not_held();
1928
1929 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1930 nla[NFTA_CHAIN_HOOK],
1931 nft_hook_policy, NULL);
1932 if (err < 0)
1933 return err;
1934
1935 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1936 ha[NFTA_HOOK_PRIORITY] == NULL)
1937 return -EINVAL;
1938
1939 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1940 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1941
1942 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1943 if (!type)
1944 return -EOPNOTSUPP;
1945
1946 if (nla[NFTA_CHAIN_TYPE]) {
1947 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1948 family, autoload);
1949 if (IS_ERR(type)) {
1950 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1951 return PTR_ERR(type);
1952 }
1953 }
1954 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1955 return -EOPNOTSUPP;
1956
1957 if (type->type == NFT_CHAIN_T_NAT &&
1958 hook->priority <= NF_IP_PRI_CONNTRACK)
1959 return -EOPNOTSUPP;
1960
1961 if (!try_module_get(type->owner)) {
1962 if (nla[NFTA_CHAIN_TYPE])
1963 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1964 return -ENOENT;
1965 }
1966
1967 hook->type = type;
1968
1969 INIT_LIST_HEAD(&hook->list);
1970 if (nft_base_chain_netdev(family, hook->num)) {
1971 err = nft_chain_parse_netdev(net, ha, &hook->list);
1972 if (err < 0) {
1973 module_put(type->owner);
1974 return err;
1975 }
1976 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1977 module_put(type->owner);
1978 return -EOPNOTSUPP;
1979 }
1980
1981 return 0;
1982}
1983
1984static void nft_chain_release_hook(struct nft_chain_hook *hook)
1985{
1986 struct nft_hook *h, *next;
1987
1988 list_for_each_entry_safe(h, next, &hook->list, list) {
1989 list_del(&h->list);
1990 kfree(h);
1991 }
1992 module_put(hook->type->owner);
1993}
1994
1995struct nft_rules_old {
1996 struct rcu_head h;
1997 struct nft_rule **start;
1998};
1999
2000static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2001 unsigned int alloc)
2002{
2003 if (alloc > INT_MAX)
2004 return NULL;
2005
2006 alloc += 1;
2007 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2008 return NULL;
2009
2010 alloc *= sizeof(struct nft_rule *);
2011 alloc += sizeof(struct nft_rules_old);
2012
2013 return kvmalloc(alloc, GFP_KERNEL);
2014}
2015
2016static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2017 const struct nft_chain_hook *hook,
2018 struct nft_chain *chain)
2019{
2020 ops->pf = family;
2021 ops->hooknum = hook->num;
2022 ops->priority = hook->priority;
2023 ops->priv = chain;
2024 ops->hook = hook->type->hooks[ops->hooknum];
2025 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2026}
2027
2028static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2029 struct nft_chain_hook *hook, u32 flags)
2030{
2031 struct nft_chain *chain;
2032 struct nft_hook *h;
2033
2034 basechain->type = hook->type;
2035 INIT_LIST_HEAD(&basechain->hook_list);
2036 chain = &basechain->chain;
2037
2038 if (nft_base_chain_netdev(family, hook->num)) {
2039 list_splice_init(&hook->list, &basechain->hook_list);
2040 list_for_each_entry(h, &basechain->hook_list, list)
2041 nft_basechain_hook_init(&h->ops, family, hook, chain);
2042
2043 basechain->ops.hooknum = hook->num;
2044 basechain->ops.priority = hook->priority;
2045 } else {
2046 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2047 }
2048
2049 chain->flags |= NFT_CHAIN_BASE | flags;
2050 basechain->policy = NF_ACCEPT;
2051 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2052 nft_chain_offload_priority(basechain) < 0)
2053 return -EOPNOTSUPP;
2054
2055 flow_block_init(&basechain->flow_block);
2056
2057 return 0;
2058}
2059
2060static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2061{
2062 int err;
2063
2064 err = rhltable_insert_key(&table->chains_ht, chain->name,
2065 &chain->rhlhead, nft_chain_ht_params);
2066 if (err)
2067 return err;
2068
2069 list_add_tail_rcu(&chain->list, &table->chains);
2070
2071 return 0;
2072}
2073
2074static u64 chain_id;
2075
2076static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2077 u8 policy, u32 flags,
2078 struct netlink_ext_ack *extack)
2079{
2080 const struct nlattr * const *nla = ctx->nla;
2081 struct nft_table *table = ctx->table;
2082 struct nft_base_chain *basechain;
2083 struct nft_stats __percpu *stats;
2084 struct net *net = ctx->net;
2085 char name[NFT_NAME_MAXLEN];
2086 struct nft_trans *trans;
2087 struct nft_chain *chain;
2088 struct nft_rule **rules;
2089 int err;
2090
2091 if (table->use == UINT_MAX)
2092 return -EOVERFLOW;
2093
2094 if (nla[NFTA_CHAIN_HOOK]) {
2095 struct nft_chain_hook hook;
2096
2097 if (flags & NFT_CHAIN_BINDING)
2098 return -EOPNOTSUPP;
2099
2100 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2101 true);
2102 if (err < 0)
2103 return err;
2104
2105 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2106 if (basechain == NULL) {
2107 nft_chain_release_hook(&hook);
2108 return -ENOMEM;
2109 }
2110 chain = &basechain->chain;
2111
2112 if (nla[NFTA_CHAIN_COUNTERS]) {
2113 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2114 if (IS_ERR(stats)) {
2115 nft_chain_release_hook(&hook);
2116 kfree(basechain);
2117 return PTR_ERR(stats);
2118 }
2119 rcu_assign_pointer(basechain->stats, stats);
2120 static_branch_inc(&nft_counters_enabled);
2121 }
2122
2123 err = nft_basechain_init(basechain, family, &hook, flags);
2124 if (err < 0) {
2125 nft_chain_release_hook(&hook);
2126 kfree(basechain);
2127 return err;
2128 }
2129 } else {
2130 if (flags & NFT_CHAIN_BASE)
2131 return -EINVAL;
2132 if (flags & NFT_CHAIN_HW_OFFLOAD)
2133 return -EOPNOTSUPP;
2134
2135 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2136 if (chain == NULL)
2137 return -ENOMEM;
2138
2139 chain->flags = flags;
2140 }
2141 ctx->chain = chain;
2142
2143 INIT_LIST_HEAD(&chain->rules);
2144 chain->handle = nf_tables_alloc_handle(table);
2145 chain->table = table;
2146
2147 if (nla[NFTA_CHAIN_NAME]) {
2148 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2149 } else {
2150 if (!(flags & NFT_CHAIN_BINDING)) {
2151 err = -EINVAL;
2152 goto err_destroy_chain;
2153 }
2154
2155 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2156 chain->name = kstrdup(name, GFP_KERNEL);
2157 }
2158
2159 if (!chain->name) {
2160 err = -ENOMEM;
2161 goto err_destroy_chain;
2162 }
2163
2164 if (nla[NFTA_CHAIN_USERDATA]) {
2165 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2166 if (chain->udata == NULL) {
2167 err = -ENOMEM;
2168 goto err_destroy_chain;
2169 }
2170 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2171 }
2172
2173 rules = nf_tables_chain_alloc_rules(chain, 0);
2174 if (!rules) {
2175 err = -ENOMEM;
2176 goto err_destroy_chain;
2177 }
2178
2179 *rules = NULL;
2180 rcu_assign_pointer(chain->rules_gen_0, rules);
2181 rcu_assign_pointer(chain->rules_gen_1, rules);
2182
2183 err = nf_tables_register_hook(net, table, chain);
2184 if (err < 0)
2185 goto err_destroy_chain;
2186
2187 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2188 if (IS_ERR(trans)) {
2189 err = PTR_ERR(trans);
2190 goto err_unregister_hook;
2191 }
2192
2193 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2194 if (nft_is_base_chain(chain))
2195 nft_trans_chain_policy(trans) = policy;
2196
2197 err = nft_chain_add(table, chain);
2198 if (err < 0) {
2199 nft_trans_destroy(trans);
2200 goto err_unregister_hook;
2201 }
2202
2203 table->use++;
2204
2205 return 0;
2206err_unregister_hook:
2207 nf_tables_unregister_hook(net, table, chain);
2208err_destroy_chain:
2209 nf_tables_chain_destroy(ctx);
2210
2211 return err;
2212}
2213
2214static bool nft_hook_list_equal(struct list_head *hook_list1,
2215 struct list_head *hook_list2)
2216{
2217 struct nft_hook *hook;
2218 int n = 0, m = 0;
2219
2220 n = 0;
2221 list_for_each_entry(hook, hook_list2, list) {
2222 if (!nft_hook_list_find(hook_list1, hook))
2223 return false;
2224
2225 n++;
2226 }
2227 list_for_each_entry(hook, hook_list1, list)
2228 m++;
2229
2230 return n == m;
2231}
2232
2233static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2234 u32 flags, const struct nlattr *attr,
2235 struct netlink_ext_ack *extack)
2236{
2237 const struct nlattr * const *nla = ctx->nla;
2238 struct nft_table *table = ctx->table;
2239 struct nft_chain *chain = ctx->chain;
2240 struct nft_base_chain *basechain;
2241 struct nft_stats *stats = NULL;
2242 struct nft_chain_hook hook;
2243 struct nf_hook_ops *ops;
2244 struct nft_trans *trans;
2245 int err;
2246
2247 if (chain->flags ^ flags)
2248 return -EOPNOTSUPP;
2249
2250 if (nla[NFTA_CHAIN_HOOK]) {
2251 if (!nft_is_base_chain(chain)) {
2252 NL_SET_BAD_ATTR(extack, attr);
2253 return -EEXIST;
2254 }
2255 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2256 extack, false);
2257 if (err < 0)
2258 return err;
2259
2260 basechain = nft_base_chain(chain);
2261 if (basechain->type != hook.type) {
2262 nft_chain_release_hook(&hook);
2263 NL_SET_BAD_ATTR(extack, attr);
2264 return -EEXIST;
2265 }
2266
2267 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2268 if (!nft_hook_list_equal(&basechain->hook_list,
2269 &hook.list)) {
2270 nft_chain_release_hook(&hook);
2271 NL_SET_BAD_ATTR(extack, attr);
2272 return -EEXIST;
2273 }
2274 } else {
2275 ops = &basechain->ops;
2276 if (ops->hooknum != hook.num ||
2277 ops->priority != hook.priority) {
2278 nft_chain_release_hook(&hook);
2279 NL_SET_BAD_ATTR(extack, attr);
2280 return -EEXIST;
2281 }
2282 }
2283 nft_chain_release_hook(&hook);
2284 }
2285
2286 if (nla[NFTA_CHAIN_HANDLE] &&
2287 nla[NFTA_CHAIN_NAME]) {
2288 struct nft_chain *chain2;
2289
2290 chain2 = nft_chain_lookup(ctx->net, table,
2291 nla[NFTA_CHAIN_NAME], genmask);
2292 if (!IS_ERR(chain2)) {
2293 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2294 return -EEXIST;
2295 }
2296 }
2297
2298 if (nla[NFTA_CHAIN_COUNTERS]) {
2299 if (!nft_is_base_chain(chain))
2300 return -EOPNOTSUPP;
2301
2302 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2303 if (IS_ERR(stats))
2304 return PTR_ERR(stats);
2305 }
2306
2307 err = -ENOMEM;
2308 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2309 sizeof(struct nft_trans_chain));
2310 if (trans == NULL)
2311 goto err;
2312
2313 nft_trans_chain_stats(trans) = stats;
2314 nft_trans_chain_update(trans) = true;
2315
2316 if (nla[NFTA_CHAIN_POLICY])
2317 nft_trans_chain_policy(trans) = policy;
2318 else
2319 nft_trans_chain_policy(trans) = -1;
2320
2321 if (nla[NFTA_CHAIN_HANDLE] &&
2322 nla[NFTA_CHAIN_NAME]) {
2323 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2324 struct nft_trans *tmp;
2325 char *name;
2326
2327 err = -ENOMEM;
2328 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2329 if (!name)
2330 goto err;
2331
2332 err = -EEXIST;
2333 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2334 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2335 tmp->ctx.table == table &&
2336 nft_trans_chain_update(tmp) &&
2337 nft_trans_chain_name(tmp) &&
2338 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2339 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2340 kfree(name);
2341 goto err;
2342 }
2343 }
2344
2345 nft_trans_chain_name(trans) = name;
2346 }
2347 nft_trans_commit_list_add_tail(ctx->net, trans);
2348
2349 return 0;
2350err:
2351 free_percpu(stats);
2352 kfree(trans);
2353 return err;
2354}
2355
2356static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2357 const struct nlattr *nla)
2358{
2359 struct nftables_pernet *nft_net = nft_pernet(net);
2360 u32 id = ntohl(nla_get_be32(nla));
2361 struct nft_trans *trans;
2362
2363 list_for_each_entry(trans, &nft_net->commit_list, list) {
2364 struct nft_chain *chain = trans->ctx.chain;
2365
2366 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2367 id == nft_trans_chain_id(trans))
2368 return chain;
2369 }
2370 return ERR_PTR(-ENOENT);
2371}
2372
2373static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2374 const struct nlattr * const nla[])
2375{
2376 struct nftables_pernet *nft_net = nft_pernet(info->net);
2377 struct netlink_ext_ack *extack = info->extack;
2378 u8 genmask = nft_genmask_next(info->net);
2379 u8 family = info->nfmsg->nfgen_family;
2380 struct nft_chain *chain = NULL;
2381 struct net *net = info->net;
2382 const struct nlattr *attr;
2383 struct nft_table *table;
2384 u8 policy = NF_ACCEPT;
2385 struct nft_ctx ctx;
2386 u64 handle = 0;
2387 u32 flags = 0;
2388
2389 lockdep_assert_held(&nft_net->commit_mutex);
2390
2391 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2392 NETLINK_CB(skb).portid);
2393 if (IS_ERR(table)) {
2394 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2395 return PTR_ERR(table);
2396 }
2397
2398 chain = NULL;
2399 attr = nla[NFTA_CHAIN_NAME];
2400
2401 if (nla[NFTA_CHAIN_HANDLE]) {
2402 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2403 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2404 if (IS_ERR(chain)) {
2405 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2406 return PTR_ERR(chain);
2407 }
2408 attr = nla[NFTA_CHAIN_HANDLE];
2409 } else if (nla[NFTA_CHAIN_NAME]) {
2410 chain = nft_chain_lookup(net, table, attr, genmask);
2411 if (IS_ERR(chain)) {
2412 if (PTR_ERR(chain) != -ENOENT) {
2413 NL_SET_BAD_ATTR(extack, attr);
2414 return PTR_ERR(chain);
2415 }
2416 chain = NULL;
2417 }
2418 } else if (!nla[NFTA_CHAIN_ID]) {
2419 return -EINVAL;
2420 }
2421
2422 if (nla[NFTA_CHAIN_POLICY]) {
2423 if (chain != NULL &&
2424 !nft_is_base_chain(chain)) {
2425 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2426 return -EOPNOTSUPP;
2427 }
2428
2429 if (chain == NULL &&
2430 nla[NFTA_CHAIN_HOOK] == NULL) {
2431 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2432 return -EOPNOTSUPP;
2433 }
2434
2435 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2436 switch (policy) {
2437 case NF_DROP:
2438 case NF_ACCEPT:
2439 break;
2440 default:
2441 return -EINVAL;
2442 }
2443 }
2444
2445 if (nla[NFTA_CHAIN_FLAGS])
2446 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2447 else if (chain)
2448 flags = chain->flags;
2449
2450 if (flags & ~NFT_CHAIN_FLAGS)
2451 return -EOPNOTSUPP;
2452
2453 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2454
2455 if (chain != NULL) {
2456 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2457 NL_SET_BAD_ATTR(extack, attr);
2458 return -EEXIST;
2459 }
2460 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2461 return -EOPNOTSUPP;
2462
2463 flags |= chain->flags & NFT_CHAIN_BASE;
2464 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2465 extack);
2466 }
2467
2468 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2469}
2470
2471static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2472 const struct nlattr * const nla[])
2473{
2474 struct netlink_ext_ack *extack = info->extack;
2475 u8 genmask = nft_genmask_next(info->net);
2476 u8 family = info->nfmsg->nfgen_family;
2477 struct net *net = info->net;
2478 const struct nlattr *attr;
2479 struct nft_table *table;
2480 struct nft_chain *chain;
2481 struct nft_rule *rule;
2482 struct nft_ctx ctx;
2483 u64 handle;
2484 u32 use;
2485 int err;
2486
2487 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2488 NETLINK_CB(skb).portid);
2489 if (IS_ERR(table)) {
2490 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2491 return PTR_ERR(table);
2492 }
2493
2494 if (nla[NFTA_CHAIN_HANDLE]) {
2495 attr = nla[NFTA_CHAIN_HANDLE];
2496 handle = be64_to_cpu(nla_get_be64(attr));
2497 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2498 } else {
2499 attr = nla[NFTA_CHAIN_NAME];
2500 chain = nft_chain_lookup(net, table, attr, genmask);
2501 }
2502 if (IS_ERR(chain)) {
2503 NL_SET_BAD_ATTR(extack, attr);
2504 return PTR_ERR(chain);
2505 }
2506
2507 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2508 chain->use > 0)
2509 return -EBUSY;
2510
2511 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2512
2513 use = chain->use;
2514 list_for_each_entry(rule, &chain->rules, list) {
2515 if (!nft_is_active_next(net, rule))
2516 continue;
2517 use--;
2518
2519 err = nft_delrule(&ctx, rule);
2520 if (err < 0)
2521 return err;
2522 }
2523
2524
2525
2526
2527 if (use > 0) {
2528 NL_SET_BAD_ATTR(extack, attr);
2529 return -EBUSY;
2530 }
2531
2532 return nft_delchain(&ctx);
2533}
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546int nft_register_expr(struct nft_expr_type *type)
2547{
2548 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2549 if (type->family == NFPROTO_UNSPEC)
2550 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2551 else
2552 list_add_rcu(&type->list, &nf_tables_expressions);
2553 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2554 return 0;
2555}
2556EXPORT_SYMBOL_GPL(nft_register_expr);
2557
2558
2559
2560
2561
2562
2563
2564void nft_unregister_expr(struct nft_expr_type *type)
2565{
2566 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2567 list_del_rcu(&type->list);
2568 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2569}
2570EXPORT_SYMBOL_GPL(nft_unregister_expr);
2571
2572static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2573 struct nlattr *nla)
2574{
2575 const struct nft_expr_type *type, *candidate = NULL;
2576
2577 list_for_each_entry(type, &nf_tables_expressions, list) {
2578 if (!nla_strcmp(nla, type->name)) {
2579 if (!type->family && !candidate)
2580 candidate = type;
2581 else if (type->family == family)
2582 candidate = type;
2583 }
2584 }
2585 return candidate;
2586}
2587
2588#ifdef CONFIG_MODULES
2589static int nft_expr_type_request_module(struct net *net, u8 family,
2590 struct nlattr *nla)
2591{
2592 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2593 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2594 return -EAGAIN;
2595
2596 return 0;
2597}
2598#endif
2599
2600static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2601 u8 family,
2602 struct nlattr *nla)
2603{
2604 const struct nft_expr_type *type;
2605
2606 if (nla == NULL)
2607 return ERR_PTR(-EINVAL);
2608
2609 type = __nft_expr_type_get(family, nla);
2610 if (type != NULL && try_module_get(type->owner))
2611 return type;
2612
2613 lockdep_nfnl_nft_mutex_not_held();
2614#ifdef CONFIG_MODULES
2615 if (type == NULL) {
2616 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2617 return ERR_PTR(-EAGAIN);
2618
2619 if (nft_request_module(net, "nft-expr-%.*s",
2620 nla_len(nla),
2621 (char *)nla_data(nla)) == -EAGAIN)
2622 return ERR_PTR(-EAGAIN);
2623 }
2624#endif
2625 return ERR_PTR(-ENOENT);
2626}
2627
2628static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2629 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2630 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2631 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2632};
2633
2634static int nf_tables_fill_expr_info(struct sk_buff *skb,
2635 const struct nft_expr *expr)
2636{
2637 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2638 goto nla_put_failure;
2639
2640 if (expr->ops->dump) {
2641 struct nlattr *data = nla_nest_start_noflag(skb,
2642 NFTA_EXPR_DATA);
2643 if (data == NULL)
2644 goto nla_put_failure;
2645 if (expr->ops->dump(skb, expr) < 0)
2646 goto nla_put_failure;
2647 nla_nest_end(skb, data);
2648 }
2649
2650 return skb->len;
2651
2652nla_put_failure:
2653 return -1;
2654};
2655
2656int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2657 const struct nft_expr *expr)
2658{
2659 struct nlattr *nest;
2660
2661 nest = nla_nest_start_noflag(skb, attr);
2662 if (!nest)
2663 goto nla_put_failure;
2664 if (nf_tables_fill_expr_info(skb, expr) < 0)
2665 goto nla_put_failure;
2666 nla_nest_end(skb, nest);
2667 return 0;
2668
2669nla_put_failure:
2670 return -1;
2671}
2672
2673struct nft_expr_info {
2674 const struct nft_expr_ops *ops;
2675 const struct nlattr *attr;
2676 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2677};
2678
2679static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2680 const struct nlattr *nla,
2681 struct nft_expr_info *info)
2682{
2683 const struct nft_expr_type *type;
2684 const struct nft_expr_ops *ops;
2685 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2686 int err;
2687
2688 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2689 nft_expr_policy, NULL);
2690 if (err < 0)
2691 return err;
2692
2693 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2694 if (IS_ERR(type))
2695 return PTR_ERR(type);
2696
2697 if (tb[NFTA_EXPR_DATA]) {
2698 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2699 tb[NFTA_EXPR_DATA],
2700 type->policy, NULL);
2701 if (err < 0)
2702 goto err1;
2703 } else
2704 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2705
2706 if (type->select_ops != NULL) {
2707 ops = type->select_ops(ctx,
2708 (const struct nlattr * const *)info->tb);
2709 if (IS_ERR(ops)) {
2710 err = PTR_ERR(ops);
2711#ifdef CONFIG_MODULES
2712 if (err == -EAGAIN)
2713 if (nft_expr_type_request_module(ctx->net,
2714 ctx->family,
2715 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2716 err = -ENOENT;
2717#endif
2718 goto err1;
2719 }
2720 } else
2721 ops = type->ops;
2722
2723 info->attr = nla;
2724 info->ops = ops;
2725
2726 return 0;
2727
2728err1:
2729 module_put(type->owner);
2730 return err;
2731}
2732
2733static int nf_tables_newexpr(const struct nft_ctx *ctx,
2734 const struct nft_expr_info *expr_info,
2735 struct nft_expr *expr)
2736{
2737 const struct nft_expr_ops *ops = expr_info->ops;
2738 int err;
2739
2740 expr->ops = ops;
2741 if (ops->init) {
2742 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2743 if (err < 0)
2744 goto err1;
2745 }
2746
2747 return 0;
2748err1:
2749 expr->ops = NULL;
2750 return err;
2751}
2752
2753static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2754 struct nft_expr *expr)
2755{
2756 const struct nft_expr_type *type = expr->ops->type;
2757
2758 if (expr->ops->destroy)
2759 expr->ops->destroy(ctx, expr);
2760 module_put(type->owner);
2761}
2762
2763static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2764 const struct nlattr *nla)
2765{
2766 struct nft_expr_info expr_info;
2767 struct nft_expr *expr;
2768 struct module *owner;
2769 int err;
2770
2771 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2772 if (err < 0)
2773 goto err1;
2774
2775 err = -ENOMEM;
2776 expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2777 if (expr == NULL)
2778 goto err2;
2779
2780 err = nf_tables_newexpr(ctx, &expr_info, expr);
2781 if (err < 0)
2782 goto err3;
2783
2784 return expr;
2785err3:
2786 kfree(expr);
2787err2:
2788 owner = expr_info.ops->type->owner;
2789 if (expr_info.ops->type->release_ops)
2790 expr_info.ops->type->release_ops(expr_info.ops);
2791
2792 module_put(owner);
2793err1:
2794 return ERR_PTR(err);
2795}
2796
2797int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2798{
2799 int err;
2800
2801 if (src->ops->clone) {
2802 dst->ops = src->ops;
2803 err = src->ops->clone(dst, src);
2804 if (err < 0)
2805 return err;
2806 } else {
2807 memcpy(dst, src, src->ops->size);
2808 }
2809
2810 __module_get(src->ops->type->owner);
2811
2812 return 0;
2813}
2814
2815void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2816{
2817 nf_tables_expr_destroy(ctx, expr);
2818 kfree(expr);
2819}
2820
2821
2822
2823
2824
2825static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2826 u64 handle)
2827{
2828 struct nft_rule *rule;
2829
2830
2831 list_for_each_entry_rcu(rule, &chain->rules, list) {
2832 if (handle == rule->handle)
2833 return rule;
2834 }
2835
2836 return ERR_PTR(-ENOENT);
2837}
2838
2839static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2840 const struct nlattr *nla)
2841{
2842 if (nla == NULL)
2843 return ERR_PTR(-EINVAL);
2844
2845 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2846}
2847
2848static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2849 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2850 .len = NFT_TABLE_MAXNAMELEN - 1 },
2851 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2852 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2853 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2854 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2855 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2856 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2857 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2858 .len = NFT_USERDATA_MAXLEN },
2859 [NFTA_RULE_ID] = { .type = NLA_U32 },
2860 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2861 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2862};
2863
2864static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2865 u32 portid, u32 seq, int event,
2866 u32 flags, int family,
2867 const struct nft_table *table,
2868 const struct nft_chain *chain,
2869 const struct nft_rule *rule,
2870 const struct nft_rule *prule)
2871{
2872 struct nlmsghdr *nlh;
2873 const struct nft_expr *expr, *next;
2874 struct nlattr *list;
2875 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2876
2877 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2878 nft_base_seq(net));
2879 if (!nlh)
2880 goto nla_put_failure;
2881
2882 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2883 goto nla_put_failure;
2884 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2885 goto nla_put_failure;
2886 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2887 NFTA_RULE_PAD))
2888 goto nla_put_failure;
2889
2890 if (event != NFT_MSG_DELRULE && prule) {
2891 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2892 cpu_to_be64(prule->handle),
2893 NFTA_RULE_PAD))
2894 goto nla_put_failure;
2895 }
2896
2897 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2898 nft_flow_rule_stats(chain, rule);
2899
2900 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2901 if (list == NULL)
2902 goto nla_put_failure;
2903 nft_rule_for_each_expr(expr, next, rule) {
2904 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2905 goto nla_put_failure;
2906 }
2907 nla_nest_end(skb, list);
2908
2909 if (rule->udata) {
2910 struct nft_userdata *udata = nft_userdata(rule);
2911 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2912 udata->data) < 0)
2913 goto nla_put_failure;
2914 }
2915
2916 nlmsg_end(skb, nlh);
2917 return 0;
2918
2919nla_put_failure:
2920 nlmsg_trim(skb, nlh);
2921 return -1;
2922}
2923
2924static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2925 const struct nft_rule *rule, int event)
2926{
2927 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2928 struct sk_buff *skb;
2929 int err;
2930
2931 if (!ctx->report &&
2932 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2933 return;
2934
2935 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2936 if (skb == NULL)
2937 goto err;
2938
2939 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2940 event, 0, ctx->family, ctx->table,
2941 ctx->chain, rule, NULL);
2942 if (err < 0) {
2943 kfree_skb(skb);
2944 goto err;
2945 }
2946
2947 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2948 return;
2949err:
2950 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2951}
2952
2953struct nft_rule_dump_ctx {
2954 char *table;
2955 char *chain;
2956};
2957
2958static int __nf_tables_dump_rules(struct sk_buff *skb,
2959 unsigned int *idx,
2960 struct netlink_callback *cb,
2961 const struct nft_table *table,
2962 const struct nft_chain *chain)
2963{
2964 struct net *net = sock_net(skb->sk);
2965 const struct nft_rule *rule, *prule;
2966 unsigned int s_idx = cb->args[0];
2967
2968 prule = NULL;
2969 list_for_each_entry_rcu(rule, &chain->rules, list) {
2970 if (!nft_is_active(net, rule))
2971 goto cont_skip;
2972 if (*idx < s_idx)
2973 goto cont;
2974 if (*idx > s_idx) {
2975 memset(&cb->args[1], 0,
2976 sizeof(cb->args) - sizeof(cb->args[0]));
2977 }
2978 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2979 cb->nlh->nlmsg_seq,
2980 NFT_MSG_NEWRULE,
2981 NLM_F_MULTI | NLM_F_APPEND,
2982 table->family,
2983 table, chain, rule, prule) < 0)
2984 return 1;
2985
2986 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2987cont:
2988 prule = rule;
2989cont_skip:
2990 (*idx)++;
2991 }
2992 return 0;
2993}
2994
2995static int nf_tables_dump_rules(struct sk_buff *skb,
2996 struct netlink_callback *cb)
2997{
2998 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2999 const struct nft_rule_dump_ctx *ctx = cb->data;
3000 struct nft_table *table;
3001 const struct nft_chain *chain;
3002 unsigned int idx = 0;
3003 struct net *net = sock_net(skb->sk);
3004 int family = nfmsg->nfgen_family;
3005 struct nftables_pernet *nft_net;
3006
3007 rcu_read_lock();
3008 nft_net = nft_pernet(net);
3009 cb->seq = nft_net->base_seq;
3010
3011 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3012 if (family != NFPROTO_UNSPEC && family != table->family)
3013 continue;
3014
3015 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3016 continue;
3017
3018 if (ctx && ctx->table && ctx->chain) {
3019 struct rhlist_head *list, *tmp;
3020
3021 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3022 nft_chain_ht_params);
3023 if (!list)
3024 goto done;
3025
3026 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3027 if (!nft_is_active(net, chain))
3028 continue;
3029 __nf_tables_dump_rules(skb, &idx,
3030 cb, table, chain);
3031 break;
3032 }
3033 goto done;
3034 }
3035
3036 list_for_each_entry_rcu(chain, &table->chains, list) {
3037 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3038 goto done;
3039 }
3040
3041 if (ctx && ctx->table)
3042 break;
3043 }
3044done:
3045 rcu_read_unlock();
3046
3047 cb->args[0] = idx;
3048 return skb->len;
3049}
3050
3051static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3052{
3053 const struct nlattr * const *nla = cb->data;
3054 struct nft_rule_dump_ctx *ctx = NULL;
3055
3056 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3057 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3058 if (!ctx)
3059 return -ENOMEM;
3060
3061 if (nla[NFTA_RULE_TABLE]) {
3062 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3063 GFP_ATOMIC);
3064 if (!ctx->table) {
3065 kfree(ctx);
3066 return -ENOMEM;
3067 }
3068 }
3069 if (nla[NFTA_RULE_CHAIN]) {
3070 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3071 GFP_ATOMIC);
3072 if (!ctx->chain) {
3073 kfree(ctx->table);
3074 kfree(ctx);
3075 return -ENOMEM;
3076 }
3077 }
3078 }
3079
3080 cb->data = ctx;
3081 return 0;
3082}
3083
3084static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3085{
3086 struct nft_rule_dump_ctx *ctx = cb->data;
3087
3088 if (ctx) {
3089 kfree(ctx->table);
3090 kfree(ctx->chain);
3091 kfree(ctx);
3092 }
3093 return 0;
3094}
3095
3096
3097static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3098 const struct nlattr * const nla[])
3099{
3100 struct netlink_ext_ack *extack = info->extack;
3101 u8 genmask = nft_genmask_cur(info->net);
3102 u8 family = info->nfmsg->nfgen_family;
3103 const struct nft_chain *chain;
3104 const struct nft_rule *rule;
3105 struct net *net = info->net;
3106 struct nft_table *table;
3107 struct sk_buff *skb2;
3108 int err;
3109
3110 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3111 struct netlink_dump_control c = {
3112 .start= nf_tables_dump_rules_start,
3113 .dump = nf_tables_dump_rules,
3114 .done = nf_tables_dump_rules_done,
3115 .module = THIS_MODULE,
3116 .data = (void *)nla,
3117 };
3118
3119 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3120 }
3121
3122 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3123 if (IS_ERR(table)) {
3124 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3125 return PTR_ERR(table);
3126 }
3127
3128 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3129 if (IS_ERR(chain)) {
3130 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3131 return PTR_ERR(chain);
3132 }
3133
3134 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3135 if (IS_ERR(rule)) {
3136 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3137 return PTR_ERR(rule);
3138 }
3139
3140 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3141 if (!skb2)
3142 return -ENOMEM;
3143
3144 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3145 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3146 family, table, chain, rule, NULL);
3147 if (err < 0)
3148 goto err_fill_rule_info;
3149
3150 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3151
3152err_fill_rule_info:
3153 kfree_skb(skb2);
3154 return err;
3155}
3156
3157static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3158 struct nft_rule *rule)
3159{
3160 struct nft_expr *expr, *next;
3161
3162
3163
3164
3165
3166 expr = nft_expr_first(rule);
3167 while (nft_expr_more(rule, expr)) {
3168 next = nft_expr_next(expr);
3169 nf_tables_expr_destroy(ctx, expr);
3170 expr = next;
3171 }
3172 kfree(rule);
3173}
3174
3175void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3176{
3177 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3178 nf_tables_rule_destroy(ctx, rule);
3179}
3180
3181int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3182{
3183 struct nft_expr *expr, *last;
3184 const struct nft_data *data;
3185 struct nft_rule *rule;
3186 int err;
3187
3188 if (ctx->level == NFT_JUMP_STACK_SIZE)
3189 return -EMLINK;
3190
3191 list_for_each_entry(rule, &chain->rules, list) {
3192 if (!nft_is_active_next(ctx->net, rule))
3193 continue;
3194
3195 nft_rule_for_each_expr(expr, last, rule) {
3196 if (!expr->ops->validate)
3197 continue;
3198
3199 err = expr->ops->validate(ctx, expr, &data);
3200 if (err < 0)
3201 return err;
3202 }
3203 }
3204
3205 return 0;
3206}
3207EXPORT_SYMBOL_GPL(nft_chain_validate);
3208
3209static int nft_table_validate(struct net *net, const struct nft_table *table)
3210{
3211 struct nft_chain *chain;
3212 struct nft_ctx ctx = {
3213 .net = net,
3214 .family = table->family,
3215 };
3216 int err;
3217
3218 list_for_each_entry(chain, &table->chains, list) {
3219 if (!nft_is_base_chain(chain))
3220 continue;
3221
3222 ctx.chain = chain;
3223 err = nft_chain_validate(&ctx, chain);
3224 if (err < 0)
3225 return err;
3226 }
3227
3228 return 0;
3229}
3230
3231static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3232 const struct nlattr *nla);
3233
3234#define NFT_RULE_MAXEXPRS 128
3235
3236static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3237 const struct nlattr * const nla[])
3238{
3239 struct nftables_pernet *nft_net = nft_pernet(info->net);
3240 struct netlink_ext_ack *extack = info->extack;
3241 unsigned int size, i, n, ulen = 0, usize = 0;
3242 u8 genmask = nft_genmask_next(info->net);
3243 struct nft_rule *rule, *old_rule = NULL;
3244 struct nft_expr_info *expr_info = NULL;
3245 u8 family = info->nfmsg->nfgen_family;
3246 struct nft_flow_rule *flow = NULL;
3247 struct net *net = info->net;
3248 struct nft_userdata *udata;
3249 struct nft_table *table;
3250 struct nft_chain *chain;
3251 struct nft_trans *trans;
3252 u64 handle, pos_handle;
3253 struct nft_expr *expr;
3254 struct nft_ctx ctx;
3255 struct nlattr *tmp;
3256 int err, rem;
3257
3258 lockdep_assert_held(&nft_net->commit_mutex);
3259
3260 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3261 NETLINK_CB(skb).portid);
3262 if (IS_ERR(table)) {
3263 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3264 return PTR_ERR(table);
3265 }
3266
3267 if (nla[NFTA_RULE_CHAIN]) {
3268 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3269 genmask);
3270 if (IS_ERR(chain)) {
3271 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3272 return PTR_ERR(chain);
3273 }
3274 if (nft_chain_is_bound(chain))
3275 return -EOPNOTSUPP;
3276
3277 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3278 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3279 if (IS_ERR(chain)) {
3280 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3281 return PTR_ERR(chain);
3282 }
3283 } else {
3284 return -EINVAL;
3285 }
3286
3287 if (nla[NFTA_RULE_HANDLE]) {
3288 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3289 rule = __nft_rule_lookup(chain, handle);
3290 if (IS_ERR(rule)) {
3291 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3292 return PTR_ERR(rule);
3293 }
3294
3295 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3296 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3297 return -EEXIST;
3298 }
3299 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3300 old_rule = rule;
3301 else
3302 return -EOPNOTSUPP;
3303 } else {
3304 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3305 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3306 return -EINVAL;
3307 handle = nf_tables_alloc_handle(table);
3308
3309 if (chain->use == UINT_MAX)
3310 return -EOVERFLOW;
3311
3312 if (nla[NFTA_RULE_POSITION]) {
3313 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3314 old_rule = __nft_rule_lookup(chain, pos_handle);
3315 if (IS_ERR(old_rule)) {
3316 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3317 return PTR_ERR(old_rule);
3318 }
3319 } else if (nla[NFTA_RULE_POSITION_ID]) {
3320 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3321 if (IS_ERR(old_rule)) {
3322 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3323 return PTR_ERR(old_rule);
3324 }
3325 }
3326 }
3327
3328 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3329
3330 n = 0;
3331 size = 0;
3332 if (nla[NFTA_RULE_EXPRESSIONS]) {
3333 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3334 sizeof(struct nft_expr_info),
3335 GFP_KERNEL);
3336 if (!expr_info)
3337 return -ENOMEM;
3338
3339 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3340 err = -EINVAL;
3341 if (nla_type(tmp) != NFTA_LIST_ELEM)
3342 goto err_release_expr;
3343 if (n == NFT_RULE_MAXEXPRS)
3344 goto err_release_expr;
3345 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3346 if (err < 0) {
3347 NL_SET_BAD_ATTR(extack, tmp);
3348 goto err_release_expr;
3349 }
3350 size += expr_info[n].ops->size;
3351 n++;
3352 }
3353 }
3354
3355 err = -EFBIG;
3356 if (size >= 1 << 12)
3357 goto err_release_expr;
3358
3359 if (nla[NFTA_RULE_USERDATA]) {
3360 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3361 if (ulen > 0)
3362 usize = sizeof(struct nft_userdata) + ulen;
3363 }
3364
3365 err = -ENOMEM;
3366 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3367 if (rule == NULL)
3368 goto err_release_expr;
3369
3370 nft_activate_next(net, rule);
3371
3372 rule->handle = handle;
3373 rule->dlen = size;
3374 rule->udata = ulen ? 1 : 0;
3375
3376 if (ulen) {
3377 udata = nft_userdata(rule);
3378 udata->len = ulen - 1;
3379 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3380 }
3381
3382 expr = nft_expr_first(rule);
3383 for (i = 0; i < n; i++) {
3384 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3385 if (err < 0) {
3386 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3387 goto err_release_rule;
3388 }
3389
3390 if (expr_info[i].ops->validate)
3391 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3392
3393 expr_info[i].ops = NULL;
3394 expr = nft_expr_next(expr);
3395 }
3396
3397 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3398 flow = nft_flow_rule_create(net, rule);
3399 if (IS_ERR(flow)) {
3400 err = PTR_ERR(flow);
3401 goto err_release_rule;
3402 }
3403 }
3404
3405 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3406 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3407 if (trans == NULL) {
3408 err = -ENOMEM;
3409 goto err_destroy_flow_rule;
3410 }
3411 err = nft_delrule(&ctx, old_rule);
3412 if (err < 0) {
3413 nft_trans_destroy(trans);
3414 goto err_destroy_flow_rule;
3415 }
3416
3417 list_add_tail_rcu(&rule->list, &old_rule->list);
3418 } else {
3419 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3420 if (!trans) {
3421 err = -ENOMEM;
3422 goto err_destroy_flow_rule;
3423 }
3424
3425 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3426 if (old_rule)
3427 list_add_rcu(&rule->list, &old_rule->list);
3428 else
3429 list_add_tail_rcu(&rule->list, &chain->rules);
3430 } else {
3431 if (old_rule)
3432 list_add_tail_rcu(&rule->list, &old_rule->list);
3433 else
3434 list_add_rcu(&rule->list, &chain->rules);
3435 }
3436 }
3437 kvfree(expr_info);
3438 chain->use++;
3439
3440 if (flow)
3441 nft_trans_flow_rule(trans) = flow;
3442
3443 if (nft_net->validate_state == NFT_VALIDATE_DO)
3444 return nft_table_validate(net, table);
3445
3446 return 0;
3447
3448err_destroy_flow_rule:
3449 if (flow)
3450 nft_flow_rule_destroy(flow);
3451err_release_rule:
3452 nf_tables_rule_release(&ctx, rule);
3453err_release_expr:
3454 for (i = 0; i < n; i++) {
3455 if (expr_info[i].ops) {
3456 module_put(expr_info[i].ops->type->owner);
3457 if (expr_info[i].ops->type->release_ops)
3458 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3459 }
3460 }
3461 kvfree(expr_info);
3462
3463 return err;
3464}
3465
3466static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3467 const struct nlattr *nla)
3468{
3469 struct nftables_pernet *nft_net = nft_pernet(net);
3470 u32 id = ntohl(nla_get_be32(nla));
3471 struct nft_trans *trans;
3472
3473 list_for_each_entry(trans, &nft_net->commit_list, list) {
3474 struct nft_rule *rule = nft_trans_rule(trans);
3475
3476 if (trans->msg_type == NFT_MSG_NEWRULE &&
3477 id == nft_trans_rule_id(trans))
3478 return rule;
3479 }
3480 return ERR_PTR(-ENOENT);
3481}
3482
3483static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3484 const struct nlattr * const nla[])
3485{
3486 struct netlink_ext_ack *extack = info->extack;
3487 u8 genmask = nft_genmask_next(info->net);
3488 u8 family = info->nfmsg->nfgen_family;
3489 struct nft_chain *chain = NULL;
3490 struct net *net = info->net;
3491 struct nft_table *table;
3492 struct nft_rule *rule;
3493 struct nft_ctx ctx;
3494 int err = 0;
3495
3496 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3497 NETLINK_CB(skb).portid);
3498 if (IS_ERR(table)) {
3499 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3500 return PTR_ERR(table);
3501 }
3502
3503 if (nla[NFTA_RULE_CHAIN]) {
3504 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3505 genmask);
3506 if (IS_ERR(chain)) {
3507 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3508 return PTR_ERR(chain);
3509 }
3510 if (nft_chain_is_bound(chain))
3511 return -EOPNOTSUPP;
3512 }
3513
3514 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3515
3516 if (chain) {
3517 if (nla[NFTA_RULE_HANDLE]) {
3518 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3519 if (IS_ERR(rule)) {
3520 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3521 return PTR_ERR(rule);
3522 }
3523
3524 err = nft_delrule(&ctx, rule);
3525 } else if (nla[NFTA_RULE_ID]) {
3526 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3527 if (IS_ERR(rule)) {
3528 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3529 return PTR_ERR(rule);
3530 }
3531
3532 err = nft_delrule(&ctx, rule);
3533 } else {
3534 err = nft_delrule_by_chain(&ctx);
3535 }
3536 } else {
3537 list_for_each_entry(chain, &table->chains, list) {
3538 if (!nft_is_active_next(net, chain))
3539 continue;
3540
3541 ctx.chain = chain;
3542 err = nft_delrule_by_chain(&ctx);
3543 if (err < 0)
3544 break;
3545 }
3546 }
3547
3548 return err;
3549}
3550
3551
3552
3553
3554static const struct nft_set_type *nft_set_types[] = {
3555 &nft_set_hash_fast_type,
3556 &nft_set_hash_type,
3557 &nft_set_rhash_type,
3558 &nft_set_bitmap_type,
3559 &nft_set_rbtree_type,
3560#if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3561 &nft_set_pipapo_avx2_type,
3562#endif
3563 &nft_set_pipapo_type,
3564};
3565
3566#define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3567 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3568 NFT_SET_EVAL)
3569
3570static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3571{
3572 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3573}
3574
3575
3576
3577
3578
3579
3580static const struct nft_set_ops *
3581nft_select_set_ops(const struct nft_ctx *ctx,
3582 const struct nlattr * const nla[],
3583 const struct nft_set_desc *desc,
3584 enum nft_set_policies policy)
3585{
3586 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3587 const struct nft_set_ops *ops, *bops;
3588 struct nft_set_estimate est, best;
3589 const struct nft_set_type *type;
3590 u32 flags = 0;
3591 int i;
3592
3593 lockdep_assert_held(&nft_net->commit_mutex);
3594 lockdep_nfnl_nft_mutex_not_held();
3595
3596 if (nla[NFTA_SET_FLAGS] != NULL)
3597 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3598
3599 bops = NULL;
3600 best.size = ~0;
3601 best.lookup = ~0;
3602 best.space = ~0;
3603
3604 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3605 type = nft_set_types[i];
3606 ops = &type->ops;
3607
3608 if (!nft_set_ops_candidate(type, flags))
3609 continue;
3610 if (!ops->estimate(desc, flags, &est))
3611 continue;
3612
3613 switch (policy) {
3614 case NFT_SET_POL_PERFORMANCE:
3615 if (est.lookup < best.lookup)
3616 break;
3617 if (est.lookup == best.lookup &&
3618 est.space < best.space)
3619 break;
3620 continue;
3621 case NFT_SET_POL_MEMORY:
3622 if (!desc->size) {
3623 if (est.space < best.space)
3624 break;
3625 if (est.space == best.space &&
3626 est.lookup < best.lookup)
3627 break;
3628 } else if (est.size < best.size || !bops) {
3629 break;
3630 }
3631 continue;
3632 default:
3633 break;
3634 }
3635
3636 bops = ops;
3637 best = est;
3638 }
3639
3640 if (bops != NULL)
3641 return bops;
3642
3643 return ERR_PTR(-EOPNOTSUPP);
3644}
3645
3646static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3647 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3648 .len = NFT_TABLE_MAXNAMELEN - 1 },
3649 [NFTA_SET_NAME] = { .type = NLA_STRING,
3650 .len = NFT_SET_MAXNAMELEN - 1 },
3651 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3652 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3653 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3654 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3655 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3656 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3657 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3658 [NFTA_SET_ID] = { .type = NLA_U32 },
3659 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3660 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3661 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3662 .len = NFT_USERDATA_MAXLEN },
3663 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3664 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3665 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3666 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3667};
3668
3669static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3670 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3671 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3672};
3673
3674static struct nft_set *nft_set_lookup(const struct nft_table *table,
3675 const struct nlattr *nla, u8 genmask)
3676{
3677 struct nft_set *set;
3678
3679 if (nla == NULL)
3680 return ERR_PTR(-EINVAL);
3681
3682 list_for_each_entry_rcu(set, &table->sets, list) {
3683 if (!nla_strcmp(nla, set->name) &&
3684 nft_active_genmask(set, genmask))
3685 return set;
3686 }
3687 return ERR_PTR(-ENOENT);
3688}
3689
3690static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3691 const struct nlattr *nla,
3692 u8 genmask)
3693{
3694 struct nft_set *set;
3695
3696 list_for_each_entry(set, &table->sets, list) {
3697 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3698 nft_active_genmask(set, genmask))
3699 return set;
3700 }
3701 return ERR_PTR(-ENOENT);
3702}
3703
3704static struct nft_set *nft_set_lookup_byid(const struct net *net,
3705 const struct nlattr *nla, u8 genmask)
3706{
3707 struct nftables_pernet *nft_net = nft_pernet(net);
3708 u32 id = ntohl(nla_get_be32(nla));
3709 struct nft_trans *trans;
3710
3711 list_for_each_entry(trans, &nft_net->commit_list, list) {
3712 if (trans->msg_type == NFT_MSG_NEWSET) {
3713 struct nft_set *set = nft_trans_set(trans);
3714
3715 if (id == nft_trans_set_id(trans) &&
3716 nft_active_genmask(set, genmask))
3717 return set;
3718 }
3719 }
3720 return ERR_PTR(-ENOENT);
3721}
3722
3723struct nft_set *nft_set_lookup_global(const struct net *net,
3724 const struct nft_table *table,
3725 const struct nlattr *nla_set_name,
3726 const struct nlattr *nla_set_id,
3727 u8 genmask)
3728{
3729 struct nft_set *set;
3730
3731 set = nft_set_lookup(table, nla_set_name, genmask);
3732 if (IS_ERR(set)) {
3733 if (!nla_set_id)
3734 return set;
3735
3736 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3737 }
3738 return set;
3739}
3740EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3741
3742static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3743 const char *name)
3744{
3745 const struct nft_set *i;
3746 const char *p;
3747 unsigned long *inuse;
3748 unsigned int n = 0, min = 0;
3749
3750 p = strchr(name, '%');
3751 if (p != NULL) {
3752 if (p[1] != 'd' || strchr(p + 2, '%'))
3753 return -EINVAL;
3754
3755 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3756 if (inuse == NULL)
3757 return -ENOMEM;
3758cont:
3759 list_for_each_entry(i, &ctx->table->sets, list) {
3760 int tmp;
3761
3762 if (!nft_is_active_next(ctx->net, set))
3763 continue;
3764 if (!sscanf(i->name, name, &tmp))
3765 continue;
3766 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3767 continue;
3768
3769 set_bit(tmp - min, inuse);
3770 }
3771
3772 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3773 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3774 min += BITS_PER_BYTE * PAGE_SIZE;
3775 memset(inuse, 0, PAGE_SIZE);
3776 goto cont;
3777 }
3778 free_page((unsigned long)inuse);
3779 }
3780
3781 set->name = kasprintf(GFP_KERNEL, name, min + n);
3782 if (!set->name)
3783 return -ENOMEM;
3784
3785 list_for_each_entry(i, &ctx->table->sets, list) {
3786 if (!nft_is_active_next(ctx->net, i))
3787 continue;
3788 if (!strcmp(set->name, i->name)) {
3789 kfree(set->name);
3790 set->name = NULL;
3791 return -ENFILE;
3792 }
3793 }
3794 return 0;
3795}
3796
3797int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3798{
3799 u64 ms = be64_to_cpu(nla_get_be64(nla));
3800 u64 max = (u64)(~((u64)0));
3801
3802 max = div_u64(max, NSEC_PER_MSEC);
3803 if (ms >= max)
3804 return -ERANGE;
3805
3806 ms *= NSEC_PER_MSEC;
3807 *result = nsecs_to_jiffies64(ms);
3808 return 0;
3809}
3810
3811__be64 nf_jiffies64_to_msecs(u64 input)
3812{
3813 return cpu_to_be64(jiffies64_to_msecs(input));
3814}
3815
3816static int nf_tables_fill_set_concat(struct sk_buff *skb,
3817 const struct nft_set *set)
3818{
3819 struct nlattr *concat, *field;
3820 int i;
3821
3822 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3823 if (!concat)
3824 return -ENOMEM;
3825
3826 for (i = 0; i < set->field_count; i++) {
3827 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3828 if (!field)
3829 return -ENOMEM;
3830
3831 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3832 htonl(set->field_len[i])))
3833 return -ENOMEM;
3834
3835 nla_nest_end(skb, field);
3836 }
3837
3838 nla_nest_end(skb, concat);
3839
3840 return 0;
3841}
3842
3843static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3844 const struct nft_set *set, u16 event, u16 flags)
3845{
3846 struct nlmsghdr *nlh;
3847 u32 portid = ctx->portid;
3848 struct nlattr *nest;
3849 u32 seq = ctx->seq;
3850 int i;
3851
3852 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3853 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3854 NFNETLINK_V0, nft_base_seq(ctx->net));
3855 if (!nlh)
3856 goto nla_put_failure;
3857
3858 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3859 goto nla_put_failure;
3860 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3861 goto nla_put_failure;
3862 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3863 NFTA_SET_PAD))
3864 goto nla_put_failure;
3865 if (set->flags != 0)
3866 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3867 goto nla_put_failure;
3868
3869 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3870 goto nla_put_failure;
3871 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3872 goto nla_put_failure;
3873 if (set->flags & NFT_SET_MAP) {
3874 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3875 goto nla_put_failure;
3876 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3877 goto nla_put_failure;
3878 }
3879 if (set->flags & NFT_SET_OBJECT &&
3880 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3881 goto nla_put_failure;
3882
3883 if (set->timeout &&
3884 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3885 nf_jiffies64_to_msecs(set->timeout),
3886 NFTA_SET_PAD))
3887 goto nla_put_failure;
3888 if (set->gc_int &&
3889 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3890 goto nla_put_failure;
3891
3892 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3893 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3894 goto nla_put_failure;
3895 }
3896
3897 if (set->udata &&
3898 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3899 goto nla_put_failure;
3900
3901 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3902 if (!nest)
3903 goto nla_put_failure;
3904 if (set->size &&
3905 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3906 goto nla_put_failure;
3907
3908 if (set->field_count > 1 &&
3909 nf_tables_fill_set_concat(skb, set))
3910 goto nla_put_failure;
3911
3912 nla_nest_end(skb, nest);
3913
3914 if (set->num_exprs == 1) {
3915 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3916 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3917 goto nla_put_failure;
3918
3919 nla_nest_end(skb, nest);
3920 } else if (set->num_exprs > 1) {
3921 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3922 if (nest == NULL)
3923 goto nla_put_failure;
3924
3925 for (i = 0; i < set->num_exprs; i++) {
3926 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3927 set->exprs[i]) < 0)
3928 goto nla_put_failure;
3929 }
3930 nla_nest_end(skb, nest);
3931 }
3932
3933 nlmsg_end(skb, nlh);
3934 return 0;
3935
3936nla_put_failure:
3937 nlmsg_trim(skb, nlh);
3938 return -1;
3939}
3940
3941static void nf_tables_set_notify(const struct nft_ctx *ctx,
3942 const struct nft_set *set, int event,
3943 gfp_t gfp_flags)
3944{
3945 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3946 struct sk_buff *skb;
3947 u32 portid = ctx->portid;
3948 int err;
3949
3950 if (!ctx->report &&
3951 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3952 return;
3953
3954 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3955 if (skb == NULL)
3956 goto err;
3957
3958 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3959 if (err < 0) {
3960 kfree_skb(skb);
3961 goto err;
3962 }
3963
3964 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3965 return;
3966err:
3967 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3968}
3969
3970static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3971{
3972 const struct nft_set *set;
3973 unsigned int idx, s_idx = cb->args[0];
3974 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3975 struct net *net = sock_net(skb->sk);
3976 struct nft_ctx *ctx = cb->data, ctx_set;
3977 struct nftables_pernet *nft_net;
3978
3979 if (cb->args[1])
3980 return skb->len;
3981
3982 rcu_read_lock();
3983 nft_net = nft_pernet(net);
3984 cb->seq = nft_net->base_seq;
3985
3986 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3987 if (ctx->family != NFPROTO_UNSPEC &&
3988 ctx->family != table->family)
3989 continue;
3990
3991 if (ctx->table && ctx->table != table)
3992 continue;
3993
3994 if (cur_table) {
3995 if (cur_table != table)
3996 continue;
3997
3998 cur_table = NULL;
3999 }
4000 idx = 0;
4001 list_for_each_entry_rcu(set, &table->sets, list) {
4002 if (idx < s_idx)
4003 goto cont;
4004 if (!nft_is_active(net, set))
4005 goto cont;
4006
4007 ctx_set = *ctx;
4008 ctx_set.table = table;
4009 ctx_set.family = table->family;
4010
4011 if (nf_tables_fill_set(skb, &ctx_set, set,
4012 NFT_MSG_NEWSET,
4013 NLM_F_MULTI) < 0) {
4014 cb->args[0] = idx;
4015 cb->args[2] = (unsigned long) table;
4016 goto done;
4017 }
4018 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4019cont:
4020 idx++;
4021 }
4022 if (s_idx)
4023 s_idx = 0;
4024 }
4025 cb->args[1] = 1;
4026done:
4027 rcu_read_unlock();
4028 return skb->len;
4029}
4030
4031static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4032{
4033 struct nft_ctx *ctx_dump = NULL;
4034
4035 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4036 if (ctx_dump == NULL)
4037 return -ENOMEM;
4038
4039 cb->data = ctx_dump;
4040 return 0;
4041}
4042
4043static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4044{
4045 kfree(cb->data);
4046 return 0;
4047}
4048
4049
4050static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4051 const struct nlattr * const nla[])
4052{
4053 struct netlink_ext_ack *extack = info->extack;
4054 u8 genmask = nft_genmask_cur(info->net);
4055 u8 family = info->nfmsg->nfgen_family;
4056 struct nft_table *table = NULL;
4057 struct net *net = info->net;
4058 const struct nft_set *set;
4059 struct sk_buff *skb2;
4060 struct nft_ctx ctx;
4061 int err;
4062
4063 if (nla[NFTA_SET_TABLE]) {
4064 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4065 genmask, 0);
4066 if (IS_ERR(table)) {
4067 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4068 return PTR_ERR(table);
4069 }
4070 }
4071
4072 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4073
4074 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4075 struct netlink_dump_control c = {
4076 .start = nf_tables_dump_sets_start,
4077 .dump = nf_tables_dump_sets,
4078 .done = nf_tables_dump_sets_done,
4079 .data = &ctx,
4080 .module = THIS_MODULE,
4081 };
4082
4083 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4084 }
4085
4086
4087 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4088 return -EAFNOSUPPORT;
4089 if (!nla[NFTA_SET_TABLE])
4090 return -EINVAL;
4091
4092 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4093 if (IS_ERR(set))
4094 return PTR_ERR(set);
4095
4096 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4097 if (skb2 == NULL)
4098 return -ENOMEM;
4099
4100 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4101 if (err < 0)
4102 goto err_fill_set_info;
4103
4104 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4105
4106err_fill_set_info:
4107 kfree_skb(skb2);
4108 return err;
4109}
4110
4111static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4112 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4113};
4114
4115static int nft_set_desc_concat_parse(const struct nlattr *attr,
4116 struct nft_set_desc *desc)
4117{
4118 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4119 u32 len;
4120 int err;
4121
4122 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4123 nft_concat_policy, NULL);
4124 if (err < 0)
4125 return err;
4126
4127 if (!tb[NFTA_SET_FIELD_LEN])
4128 return -EINVAL;
4129
4130 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4131
4132 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4133 return -E2BIG;
4134
4135 desc->field_len[desc->field_count++] = len;
4136
4137 return 0;
4138}
4139
4140static int nft_set_desc_concat(struct nft_set_desc *desc,
4141 const struct nlattr *nla)
4142{
4143 struct nlattr *attr;
4144 int rem, err;
4145
4146 nla_for_each_nested(attr, nla, rem) {
4147 if (nla_type(attr) != NFTA_LIST_ELEM)
4148 return -EINVAL;
4149
4150 err = nft_set_desc_concat_parse(attr, desc);
4151 if (err < 0)
4152 return err;
4153 }
4154
4155 return 0;
4156}
4157
4158static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4159 const struct nlattr *nla)
4160{
4161 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4162 int err;
4163
4164 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4165 nft_set_desc_policy, NULL);
4166 if (err < 0)
4167 return err;
4168
4169 if (da[NFTA_SET_DESC_SIZE] != NULL)
4170 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4171 if (da[NFTA_SET_DESC_CONCAT])
4172 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4173
4174 return err;
4175}
4176
4177static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4178 const struct nlattr * const nla[])
4179{
4180 u32 ktype, dtype, flags, policy, gc_int, objtype;
4181 struct netlink_ext_ack *extack = info->extack;
4182 u8 genmask = nft_genmask_next(info->net);
4183 u8 family = info->nfmsg->nfgen_family;
4184 const struct nft_set_ops *ops;
4185 struct nft_expr *expr = NULL;
4186 struct net *net = info->net;
4187 struct nft_set_desc desc;
4188 struct nft_table *table;
4189 unsigned char *udata;
4190 struct nft_set *set;
4191 struct nft_ctx ctx;
4192 size_t alloc_size;
4193 u64 timeout;
4194 char *name;
4195 int err, i;
4196 u16 udlen;
4197 u64 size;
4198
4199 if (nla[NFTA_SET_TABLE] == NULL ||
4200 nla[NFTA_SET_NAME] == NULL ||
4201 nla[NFTA_SET_KEY_LEN] == NULL ||
4202 nla[NFTA_SET_ID] == NULL)
4203 return -EINVAL;
4204
4205 memset(&desc, 0, sizeof(desc));
4206
4207 ktype = NFT_DATA_VALUE;
4208 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4209 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4210 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4211 return -EINVAL;
4212 }
4213
4214 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4215 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4216 return -EINVAL;
4217
4218 flags = 0;
4219 if (nla[NFTA_SET_FLAGS] != NULL) {
4220 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4221 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4222 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4223 NFT_SET_MAP | NFT_SET_EVAL |
4224 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4225 return -EOPNOTSUPP;
4226
4227 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4228 (NFT_SET_MAP | NFT_SET_OBJECT))
4229 return -EOPNOTSUPP;
4230 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4231 (NFT_SET_EVAL | NFT_SET_OBJECT))
4232 return -EOPNOTSUPP;
4233 }
4234
4235 dtype = 0;
4236 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4237 if (!(flags & NFT_SET_MAP))
4238 return -EINVAL;
4239
4240 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4241 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4242 dtype != NFT_DATA_VERDICT)
4243 return -EINVAL;
4244
4245 if (dtype != NFT_DATA_VERDICT) {
4246 if (nla[NFTA_SET_DATA_LEN] == NULL)
4247 return -EINVAL;
4248 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4249 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4250 return -EINVAL;
4251 } else
4252 desc.dlen = sizeof(struct nft_verdict);
4253 } else if (flags & NFT_SET_MAP)
4254 return -EINVAL;
4255
4256 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4257 if (!(flags & NFT_SET_OBJECT))
4258 return -EINVAL;
4259
4260 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4261 if (objtype == NFT_OBJECT_UNSPEC ||
4262 objtype > NFT_OBJECT_MAX)
4263 return -EOPNOTSUPP;
4264 } else if (flags & NFT_SET_OBJECT)
4265 return -EINVAL;
4266 else
4267 objtype = NFT_OBJECT_UNSPEC;
4268
4269 timeout = 0;
4270 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4271 if (!(flags & NFT_SET_TIMEOUT))
4272 return -EINVAL;
4273
4274 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4275 if (err)
4276 return err;
4277 }
4278 gc_int = 0;
4279 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4280 if (!(flags & NFT_SET_TIMEOUT))
4281 return -EINVAL;
4282 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4283 }
4284
4285 policy = NFT_SET_POL_PERFORMANCE;
4286 if (nla[NFTA_SET_POLICY] != NULL)
4287 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4288
4289 if (nla[NFTA_SET_DESC] != NULL) {
4290 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4291 if (err < 0)
4292 return err;
4293 }
4294
4295 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4296 desc.expr = true;
4297
4298 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4299 NETLINK_CB(skb).portid);
4300 if (IS_ERR(table)) {
4301 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4302 return PTR_ERR(table);
4303 }
4304
4305 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4306
4307 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4308 if (IS_ERR(set)) {
4309 if (PTR_ERR(set) != -ENOENT) {
4310 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4311 return PTR_ERR(set);
4312 }
4313 } else {
4314 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4315 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4316 return -EEXIST;
4317 }
4318 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4319 return -EOPNOTSUPP;
4320
4321 return 0;
4322 }
4323
4324 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4325 return -ENOENT;
4326
4327 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4328 if (IS_ERR(ops))
4329 return PTR_ERR(ops);
4330
4331 udlen = 0;
4332 if (nla[NFTA_SET_USERDATA])
4333 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4334
4335 size = 0;
4336 if (ops->privsize != NULL)
4337 size = ops->privsize(nla, &desc);
4338 alloc_size = sizeof(*set) + size + udlen;
4339 if (alloc_size < size)
4340 return -ENOMEM;
4341 set = kvzalloc(alloc_size, GFP_KERNEL);
4342 if (!set)
4343 return -ENOMEM;
4344
4345 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4346 if (!name) {
4347 err = -ENOMEM;
4348 goto err_set_name;
4349 }
4350
4351 err = nf_tables_set_alloc_name(&ctx, set, name);
4352 kfree(name);
4353 if (err < 0)
4354 goto err_set_name;
4355
4356 udata = NULL;
4357 if (udlen) {
4358 udata = set->data + size;
4359 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4360 }
4361
4362 INIT_LIST_HEAD(&set->bindings);
4363 INIT_LIST_HEAD(&set->catchall_list);
4364 set->table = table;
4365 write_pnet(&set->net, net);
4366 set->ops = ops;
4367 set->ktype = ktype;
4368 set->klen = desc.klen;
4369 set->dtype = dtype;
4370 set->objtype = objtype;
4371 set->dlen = desc.dlen;
4372 set->flags = flags;
4373 set->size = desc.size;
4374 set->policy = policy;
4375 set->udlen = udlen;
4376 set->udata = udata;
4377 set->timeout = timeout;
4378 set->gc_int = gc_int;
4379
4380 set->field_count = desc.field_count;
4381 for (i = 0; i < desc.field_count; i++)
4382 set->field_len[i] = desc.field_len[i];
4383
4384 err = ops->init(set, &desc, nla);
4385 if (err < 0)
4386 goto err_set_init;
4387
4388 if (nla[NFTA_SET_EXPR]) {
4389 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4390 if (IS_ERR(expr)) {
4391 err = PTR_ERR(expr);
4392 goto err_set_expr_alloc;
4393 }
4394 set->exprs[0] = expr;
4395 set->num_exprs++;
4396 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4397 struct nft_expr *expr;
4398 struct nlattr *tmp;
4399 int left;
4400
4401 if (!(flags & NFT_SET_EXPR)) {
4402 err = -EINVAL;
4403 goto err_set_expr_alloc;
4404 }
4405 i = 0;
4406 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4407 if (i == NFT_SET_EXPR_MAX) {
4408 err = -E2BIG;
4409 goto err_set_expr_alloc;
4410 }
4411 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4412 err = -EINVAL;
4413 goto err_set_expr_alloc;
4414 }
4415 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4416 if (IS_ERR(expr)) {
4417 err = PTR_ERR(expr);
4418 goto err_set_expr_alloc;
4419 }
4420 set->exprs[i++] = expr;
4421 set->num_exprs++;
4422 }
4423 }
4424
4425 set->handle = nf_tables_alloc_handle(table);
4426
4427 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4428 if (err < 0)
4429 goto err_set_expr_alloc;
4430
4431 list_add_tail_rcu(&set->list, &table->sets);
4432 table->use++;
4433 return 0;
4434
4435err_set_expr_alloc:
4436 for (i = 0; i < set->num_exprs; i++)
4437 nft_expr_destroy(&ctx, set->exprs[i]);
4438
4439 ops->destroy(set);
4440err_set_init:
4441 kfree(set->name);
4442err_set_name:
4443 kvfree(set);
4444 return err;
4445}
4446
4447struct nft_set_elem_catchall {
4448 struct list_head list;
4449 struct rcu_head rcu;
4450 void *elem;
4451};
4452
4453static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4454 struct nft_set *set)
4455{
4456 struct nft_set_elem_catchall *catchall;
4457
4458 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4459 list_del_rcu(&catchall->list);
4460 nft_set_elem_destroy(set, catchall->elem, true);
4461 kfree_rcu(catchall);
4462 }
4463}
4464
4465static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4466{
4467 int i;
4468
4469 if (WARN_ON(set->use > 0))
4470 return;
4471
4472 for (i = 0; i < set->num_exprs; i++)
4473 nft_expr_destroy(ctx, set->exprs[i]);
4474
4475 set->ops->destroy(set);
4476 nft_set_catchall_destroy(ctx, set);
4477 kfree(set->name);
4478 kvfree(set);
4479}
4480
4481static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4482 const struct nlattr * const nla[])
4483{
4484 struct netlink_ext_ack *extack = info->extack;
4485 u8 genmask = nft_genmask_next(info->net);
4486 u8 family = info->nfmsg->nfgen_family;
4487 struct net *net = info->net;
4488 const struct nlattr *attr;
4489 struct nft_table *table;
4490 struct nft_set *set;
4491 struct nft_ctx ctx;
4492
4493 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4494 return -EAFNOSUPPORT;
4495
4496 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4497 genmask, NETLINK_CB(skb).portid);
4498 if (IS_ERR(table)) {
4499 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4500 return PTR_ERR(table);
4501 }
4502
4503 if (nla[NFTA_SET_HANDLE]) {
4504 attr = nla[NFTA_SET_HANDLE];
4505 set = nft_set_lookup_byhandle(table, attr, genmask);
4506 } else {
4507 attr = nla[NFTA_SET_NAME];
4508 set = nft_set_lookup(table, attr, genmask);
4509 }
4510
4511 if (IS_ERR(set)) {
4512 NL_SET_BAD_ATTR(extack, attr);
4513 return PTR_ERR(set);
4514 }
4515 if (set->use ||
4516 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4517 atomic_read(&set->nelems) > 0)) {
4518 NL_SET_BAD_ATTR(extack, attr);
4519 return -EBUSY;
4520 }
4521
4522 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4523
4524 return nft_delset(&ctx, set);
4525}
4526
4527static int nft_validate_register_store(const struct nft_ctx *ctx,
4528 enum nft_registers reg,
4529 const struct nft_data *data,
4530 enum nft_data_types type,
4531 unsigned int len);
4532
4533static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4534 struct nft_set *set,
4535 struct nft_set_elem *elem)
4536{
4537 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4538 enum nft_registers dreg;
4539
4540 dreg = nft_type_to_reg(set->dtype);
4541 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4542 set->dtype == NFT_DATA_VERDICT ?
4543 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4544 set->dlen);
4545}
4546
4547static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4548 struct nft_set *set,
4549 const struct nft_set_iter *iter,
4550 struct nft_set_elem *elem)
4551{
4552 return nft_setelem_data_validate(ctx, set, elem);
4553}
4554
4555static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4556 struct nft_set *set)
4557{
4558 u8 genmask = nft_genmask_next(ctx->net);
4559 struct nft_set_elem_catchall *catchall;
4560 struct nft_set_elem elem;
4561 struct nft_set_ext *ext;
4562 int ret = 0;
4563
4564 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4565 ext = nft_set_elem_ext(set, catchall->elem);
4566 if (!nft_set_elem_active(ext, genmask))
4567 continue;
4568
4569 elem.priv = catchall->elem;
4570 ret = nft_setelem_data_validate(ctx, set, &elem);
4571 if (ret < 0)
4572 break;
4573 }
4574
4575 return ret;
4576}
4577
4578int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4579 struct nft_set_binding *binding)
4580{
4581 struct nft_set_binding *i;
4582 struct nft_set_iter iter;
4583
4584 if (set->use == UINT_MAX)
4585 return -EOVERFLOW;
4586
4587 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4588 return -EBUSY;
4589
4590 if (binding->flags & NFT_SET_MAP) {
4591
4592
4593
4594 list_for_each_entry(i, &set->bindings, list) {
4595 if (i->flags & NFT_SET_MAP &&
4596 i->chain == binding->chain)
4597 goto bind;
4598 }
4599
4600 iter.genmask = nft_genmask_next(ctx->net);
4601 iter.skip = 0;
4602 iter.count = 0;
4603 iter.err = 0;
4604 iter.fn = nf_tables_bind_check_setelem;
4605
4606 set->ops->walk(ctx, set, &iter);
4607 if (!iter.err)
4608 iter.err = nft_set_catchall_bind_check(ctx, set);
4609
4610 if (iter.err < 0)
4611 return iter.err;
4612 }
4613bind:
4614 binding->chain = ctx->chain;
4615 list_add_tail_rcu(&binding->list, &set->bindings);
4616 nft_set_trans_bind(ctx, set);
4617 set->use++;
4618
4619 return 0;
4620}
4621EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4622
4623static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4624 struct nft_set_binding *binding, bool event)
4625{
4626 list_del_rcu(&binding->list);
4627
4628 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4629 list_del_rcu(&set->list);
4630 if (event)
4631 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4632 GFP_KERNEL);
4633 }
4634}
4635
4636void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4637 struct nft_set_binding *binding,
4638 enum nft_trans_phase phase)
4639{
4640 switch (phase) {
4641 case NFT_TRANS_PREPARE:
4642 set->use--;
4643 return;
4644 case NFT_TRANS_ABORT:
4645 case NFT_TRANS_RELEASE:
4646 set->use--;
4647 fallthrough;
4648 default:
4649 nf_tables_unbind_set(ctx, set, binding,
4650 phase == NFT_TRANS_COMMIT);
4651 }
4652}
4653EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4654
4655void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4656{
4657 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4658 nft_set_destroy(ctx, set);
4659}
4660EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4661
4662const struct nft_set_ext_type nft_set_ext_types[] = {
4663 [NFT_SET_EXT_KEY] = {
4664 .align = __alignof__(u32),
4665 },
4666 [NFT_SET_EXT_DATA] = {
4667 .align = __alignof__(u32),
4668 },
4669 [NFT_SET_EXT_EXPRESSIONS] = {
4670 .align = __alignof__(struct nft_set_elem_expr),
4671 },
4672 [NFT_SET_EXT_OBJREF] = {
4673 .len = sizeof(struct nft_object *),
4674 .align = __alignof__(struct nft_object *),
4675 },
4676 [NFT_SET_EXT_FLAGS] = {
4677 .len = sizeof(u8),
4678 .align = __alignof__(u8),
4679 },
4680 [NFT_SET_EXT_TIMEOUT] = {
4681 .len = sizeof(u64),
4682 .align = __alignof__(u64),
4683 },
4684 [NFT_SET_EXT_EXPIRATION] = {
4685 .len = sizeof(u64),
4686 .align = __alignof__(u64),
4687 },
4688 [NFT_SET_EXT_USERDATA] = {
4689 .len = sizeof(struct nft_userdata),
4690 .align = __alignof__(struct nft_userdata),
4691 },
4692 [NFT_SET_EXT_KEY_END] = {
4693 .align = __alignof__(u32),
4694 },
4695};
4696
4697
4698
4699
4700
4701static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4702 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4703 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4704 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4705 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4706 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4707 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4708 .len = NFT_USERDATA_MAXLEN },
4709 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4710 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4711 .len = NFT_OBJ_MAXNAMELEN - 1 },
4712 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4713 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4714};
4715
4716static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4717 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4718 .len = NFT_TABLE_MAXNAMELEN - 1 },
4719 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4720 .len = NFT_SET_MAXNAMELEN - 1 },
4721 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4722 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4723};
4724
4725static int nft_set_elem_expr_dump(struct sk_buff *skb,
4726 const struct nft_set *set,
4727 const struct nft_set_ext *ext)
4728{
4729 struct nft_set_elem_expr *elem_expr;
4730 u32 size, num_exprs = 0;
4731 struct nft_expr *expr;
4732 struct nlattr *nest;
4733
4734 elem_expr = nft_set_ext_expr(ext);
4735 nft_setelem_expr_foreach(expr, elem_expr, size)
4736 num_exprs++;
4737
4738 if (num_exprs == 1) {
4739 expr = nft_setelem_expr_at(elem_expr, 0);
4740 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4741 return -1;
4742
4743 return 0;
4744 } else if (num_exprs > 1) {
4745 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4746 if (nest == NULL)
4747 goto nla_put_failure;
4748
4749 nft_setelem_expr_foreach(expr, elem_expr, size) {
4750 expr = nft_setelem_expr_at(elem_expr, size);
4751 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4752 goto nla_put_failure;
4753 }
4754 nla_nest_end(skb, nest);
4755 }
4756 return 0;
4757
4758nla_put_failure:
4759 return -1;
4760}
4761
4762static int nf_tables_fill_setelem(struct sk_buff *skb,
4763 const struct nft_set *set,
4764 const struct nft_set_elem *elem)
4765{
4766 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4767 unsigned char *b = skb_tail_pointer(skb);
4768 struct nlattr *nest;
4769
4770 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4771 if (nest == NULL)
4772 goto nla_put_failure;
4773
4774 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4775 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4776 NFT_DATA_VALUE, set->klen) < 0)
4777 goto nla_put_failure;
4778
4779 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4780 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4781 NFT_DATA_VALUE, set->klen) < 0)
4782 goto nla_put_failure;
4783
4784 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4785 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4786 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4787 set->dlen) < 0)
4788 goto nla_put_failure;
4789
4790 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4791 nft_set_elem_expr_dump(skb, set, ext))
4792 goto nla_put_failure;
4793
4794 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4795 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4796 (*nft_set_ext_obj(ext))->key.name) < 0)
4797 goto nla_put_failure;
4798
4799 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4800 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4801 htonl(*nft_set_ext_flags(ext))))
4802 goto nla_put_failure;
4803
4804 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4805 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4806 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4807 NFTA_SET_ELEM_PAD))
4808 goto nla_put_failure;
4809
4810 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4811 u64 expires, now = get_jiffies_64();
4812
4813 expires = *nft_set_ext_expiration(ext);
4814 if (time_before64(now, expires))
4815 expires -= now;
4816 else
4817 expires = 0;
4818
4819 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4820 nf_jiffies64_to_msecs(expires),
4821 NFTA_SET_ELEM_PAD))
4822 goto nla_put_failure;
4823 }
4824
4825 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4826 struct nft_userdata *udata;
4827
4828 udata = nft_set_ext_userdata(ext);
4829 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4830 udata->len + 1, udata->data))
4831 goto nla_put_failure;
4832 }
4833
4834 nla_nest_end(skb, nest);
4835 return 0;
4836
4837nla_put_failure:
4838 nlmsg_trim(skb, b);
4839 return -EMSGSIZE;
4840}
4841
4842struct nft_set_dump_args {
4843 const struct netlink_callback *cb;
4844 struct nft_set_iter iter;
4845 struct sk_buff *skb;
4846};
4847
4848static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4849 struct nft_set *set,
4850 const struct nft_set_iter *iter,
4851 struct nft_set_elem *elem)
4852{
4853 struct nft_set_dump_args *args;
4854
4855 args = container_of(iter, struct nft_set_dump_args, iter);
4856 return nf_tables_fill_setelem(args->skb, set, elem);
4857}
4858
4859struct nft_set_dump_ctx {
4860 const struct nft_set *set;
4861 struct nft_ctx ctx;
4862};
4863
4864static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4865 const struct nft_set *set)
4866{
4867 struct nft_set_elem_catchall *catchall;
4868 u8 genmask = nft_genmask_cur(net);
4869 struct nft_set_elem elem;
4870 struct nft_set_ext *ext;
4871 int ret = 0;
4872
4873 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4874 ext = nft_set_elem_ext(set, catchall->elem);
4875 if (!nft_set_elem_active(ext, genmask) ||
4876 nft_set_elem_expired(ext))
4877 continue;
4878
4879 elem.priv = catchall->elem;
4880 ret = nf_tables_fill_setelem(skb, set, &elem);
4881 break;
4882 }
4883
4884 return ret;
4885}
4886
4887static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4888{
4889 struct nft_set_dump_ctx *dump_ctx = cb->data;
4890 struct net *net = sock_net(skb->sk);
4891 struct nftables_pernet *nft_net;
4892 struct nft_table *table;
4893 struct nft_set *set;
4894 struct nft_set_dump_args args;
4895 bool set_found = false;
4896 struct nlmsghdr *nlh;
4897 struct nlattr *nest;
4898 u32 portid, seq;
4899 int event;
4900
4901 rcu_read_lock();
4902 nft_net = nft_pernet(net);
4903 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4904 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4905 dump_ctx->ctx.family != table->family)
4906 continue;
4907
4908 if (table != dump_ctx->ctx.table)
4909 continue;
4910
4911 list_for_each_entry_rcu(set, &table->sets, list) {
4912 if (set == dump_ctx->set) {
4913 set_found = true;
4914 break;
4915 }
4916 }
4917 break;
4918 }
4919
4920 if (!set_found) {
4921 rcu_read_unlock();
4922 return -ENOENT;
4923 }
4924
4925 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4926 portid = NETLINK_CB(cb->skb).portid;
4927 seq = cb->nlh->nlmsg_seq;
4928
4929 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4930 table->family, NFNETLINK_V0, nft_base_seq(net));
4931 if (!nlh)
4932 goto nla_put_failure;
4933
4934 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4935 goto nla_put_failure;
4936 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4937 goto nla_put_failure;
4938
4939 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4940 if (nest == NULL)
4941 goto nla_put_failure;
4942
4943 args.cb = cb;
4944 args.skb = skb;
4945 args.iter.genmask = nft_genmask_cur(net);
4946 args.iter.skip = cb->args[0];
4947 args.iter.count = 0;
4948 args.iter.err = 0;
4949 args.iter.fn = nf_tables_dump_setelem;
4950 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4951
4952 if (!args.iter.err && args.iter.count == cb->args[0])
4953 args.iter.err = nft_set_catchall_dump(net, skb, set);
4954 rcu_read_unlock();
4955
4956 nla_nest_end(skb, nest);
4957 nlmsg_end(skb, nlh);
4958
4959 if (args.iter.err && args.iter.err != -EMSGSIZE)
4960 return args.iter.err;
4961 if (args.iter.count == cb->args[0])
4962 return 0;
4963
4964 cb->args[0] = args.iter.count;
4965 return skb->len;
4966
4967nla_put_failure:
4968 rcu_read_unlock();
4969 return -ENOSPC;
4970}
4971
4972static int nf_tables_dump_set_start(struct netlink_callback *cb)
4973{
4974 struct nft_set_dump_ctx *dump_ctx = cb->data;
4975
4976 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4977
4978 return cb->data ? 0 : -ENOMEM;
4979}
4980
4981static int nf_tables_dump_set_done(struct netlink_callback *cb)
4982{
4983 kfree(cb->data);
4984 return 0;
4985}
4986
4987static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4988 const struct nft_ctx *ctx, u32 seq,
4989 u32 portid, int event, u16 flags,
4990 const struct nft_set *set,
4991 const struct nft_set_elem *elem)
4992{
4993 struct nlmsghdr *nlh;
4994 struct nlattr *nest;
4995 int err;
4996
4997 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4998 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4999 NFNETLINK_V0, nft_base_seq(ctx->net));
5000 if (!nlh)
5001 goto nla_put_failure;
5002
5003 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5004 goto nla_put_failure;
5005 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5006 goto nla_put_failure;
5007
5008 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5009 if (nest == NULL)
5010 goto nla_put_failure;
5011
5012 err = nf_tables_fill_setelem(skb, set, elem);
5013 if (err < 0)
5014 goto nla_put_failure;
5015
5016 nla_nest_end(skb, nest);
5017
5018 nlmsg_end(skb, nlh);
5019 return 0;
5020
5021nla_put_failure:
5022 nlmsg_trim(skb, nlh);
5023 return -1;
5024}
5025
5026static int nft_setelem_parse_flags(const struct nft_set *set,
5027 const struct nlattr *attr, u32 *flags)
5028{
5029 if (attr == NULL)
5030 return 0;
5031
5032 *flags = ntohl(nla_get_be32(attr));
5033 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5034 return -EOPNOTSUPP;
5035 if (!(set->flags & NFT_SET_INTERVAL) &&
5036 *flags & NFT_SET_ELEM_INTERVAL_END)
5037 return -EINVAL;
5038
5039 return 0;
5040}
5041
5042static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5043 struct nft_data *key, struct nlattr *attr)
5044{
5045 struct nft_data_desc desc;
5046 int err;
5047
5048 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5049 if (err < 0)
5050 return err;
5051
5052 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5053 nft_data_release(key, desc.type);
5054 return -EINVAL;
5055 }
5056
5057 return 0;
5058}
5059
5060static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5061 struct nft_data_desc *desc,
5062 struct nft_data *data,
5063 struct nlattr *attr)
5064{
5065 int err;
5066
5067 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5068 if (err < 0)
5069 return err;
5070
5071 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5072 nft_data_release(data, desc->type);
5073 return -EINVAL;
5074 }
5075
5076 return 0;
5077}
5078
5079static void *nft_setelem_catchall_get(const struct net *net,
5080 const struct nft_set *set)
5081{
5082 struct nft_set_elem_catchall *catchall;
5083 u8 genmask = nft_genmask_cur(net);
5084 struct nft_set_ext *ext;
5085 void *priv = NULL;
5086
5087 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5088 ext = nft_set_elem_ext(set, catchall->elem);
5089 if (!nft_set_elem_active(ext, genmask) ||
5090 nft_set_elem_expired(ext))
5091 continue;
5092
5093 priv = catchall->elem;
5094 break;
5095 }
5096
5097 return priv;
5098}
5099
5100static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5101 struct nft_set_elem *elem, u32 flags)
5102{
5103 void *priv;
5104
5105 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5106 priv = set->ops->get(ctx->net, set, elem, flags);
5107 if (IS_ERR(priv))
5108 return PTR_ERR(priv);
5109 } else {
5110 priv = nft_setelem_catchall_get(ctx->net, set);
5111 if (!priv)
5112 return -ENOENT;
5113 }
5114 elem->priv = priv;
5115
5116 return 0;
5117}
5118
5119static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5120 const struct nlattr *attr)
5121{
5122 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5123 struct nft_set_elem elem;
5124 struct sk_buff *skb;
5125 uint32_t flags = 0;
5126 int err;
5127
5128 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5129 nft_set_elem_policy, NULL);
5130 if (err < 0)
5131 return err;
5132
5133 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5134 if (err < 0)
5135 return err;
5136
5137 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5138 return -EINVAL;
5139
5140 if (nla[NFTA_SET_ELEM_KEY]) {
5141 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5142 nla[NFTA_SET_ELEM_KEY]);
5143 if (err < 0)
5144 return err;
5145 }
5146
5147 if (nla[NFTA_SET_ELEM_KEY_END]) {
5148 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5149 nla[NFTA_SET_ELEM_KEY_END]);
5150 if (err < 0)
5151 return err;
5152 }
5153
5154 err = nft_setelem_get(ctx, set, &elem, flags);
5155 if (err < 0)
5156 return err;
5157
5158 err = -ENOMEM;
5159 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5160 if (skb == NULL)
5161 return err;
5162
5163 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5164 NFT_MSG_NEWSETELEM, 0, set, &elem);
5165 if (err < 0)
5166 goto err_fill_setelem;
5167
5168 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5169
5170err_fill_setelem:
5171 kfree_skb(skb);
5172 return err;
5173}
5174
5175
5176static int nf_tables_getsetelem(struct sk_buff *skb,
5177 const struct nfnl_info *info,
5178 const struct nlattr * const nla[])
5179{
5180 struct netlink_ext_ack *extack = info->extack;
5181 u8 genmask = nft_genmask_cur(info->net);
5182 u8 family = info->nfmsg->nfgen_family;
5183 struct net *net = info->net;
5184 struct nft_table *table;
5185 struct nft_set *set;
5186 struct nlattr *attr;
5187 struct nft_ctx ctx;
5188 int rem, err = 0;
5189
5190 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5191 genmask, NETLINK_CB(skb).portid);
5192 if (IS_ERR(table)) {
5193 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5194 return PTR_ERR(table);
5195 }
5196
5197 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5198 if (IS_ERR(set))
5199 return PTR_ERR(set);
5200
5201 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5202
5203 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5204 struct netlink_dump_control c = {
5205 .start = nf_tables_dump_set_start,
5206 .dump = nf_tables_dump_set,
5207 .done = nf_tables_dump_set_done,
5208 .module = THIS_MODULE,
5209 };
5210 struct nft_set_dump_ctx dump_ctx = {
5211 .set = set,
5212 .ctx = ctx,
5213 };
5214
5215 c.data = &dump_ctx;
5216 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5217 }
5218
5219 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5220 return -EINVAL;
5221
5222 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5223 err = nft_get_set_elem(&ctx, set, attr);
5224 if (err < 0)
5225 break;
5226 }
5227
5228 return err;
5229}
5230
5231static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5232 const struct nft_set *set,
5233 const struct nft_set_elem *elem,
5234 int event, u16 flags)
5235{
5236 struct nftables_pernet *nft_net;
5237 struct net *net = ctx->net;
5238 u32 portid = ctx->portid;
5239 struct sk_buff *skb;
5240 int err;
5241
5242 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5243 return;
5244
5245 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5246 if (skb == NULL)
5247 goto err;
5248
5249 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5250 set, elem);
5251 if (err < 0) {
5252 kfree_skb(skb);
5253 goto err;
5254 }
5255
5256 nft_net = nft_pernet(net);
5257 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5258 return;
5259err:
5260 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5261}
5262
5263static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5264 int msg_type,
5265 struct nft_set *set)
5266{
5267 struct nft_trans *trans;
5268
5269 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5270 if (trans == NULL)
5271 return NULL;
5272
5273 nft_trans_elem_set(trans) = set;
5274 return trans;
5275}
5276
5277struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5278 const struct nft_set *set,
5279 const struct nlattr *attr)
5280{
5281 struct nft_expr *expr;
5282 int err;
5283
5284 expr = nft_expr_init(ctx, attr);
5285 if (IS_ERR(expr))
5286 return expr;
5287
5288 err = -EOPNOTSUPP;
5289 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5290 goto err_set_elem_expr;
5291
5292 if (expr->ops->type->flags & NFT_EXPR_GC) {
5293 if (set->flags & NFT_SET_TIMEOUT)
5294 goto err_set_elem_expr;
5295 if (!set->ops->gc_init)
5296 goto err_set_elem_expr;
5297 set->ops->gc_init(set);
5298 }
5299
5300 return expr;
5301
5302err_set_elem_expr:
5303 nft_expr_destroy(ctx, expr);
5304 return ERR_PTR(err);
5305}
5306
5307void *nft_set_elem_init(const struct nft_set *set,
5308 const struct nft_set_ext_tmpl *tmpl,
5309 const u32 *key, const u32 *key_end,
5310 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5311{
5312 struct nft_set_ext *ext;
5313 void *elem;
5314
5315 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5316 if (elem == NULL)
5317 return NULL;
5318
5319 ext = nft_set_elem_ext(set, elem);
5320 nft_set_ext_init(ext, tmpl);
5321
5322 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5323 memcpy(nft_set_ext_key(ext), key, set->klen);
5324 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5325 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5326 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5327 memcpy(nft_set_ext_data(ext), data, set->dlen);
5328 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5329 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5330 if (expiration == 0)
5331 *nft_set_ext_expiration(ext) += timeout;
5332 }
5333 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5334 *nft_set_ext_timeout(ext) = timeout;
5335
5336 return elem;
5337}
5338
5339static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5340 struct nft_expr *expr)
5341{
5342 if (expr->ops->destroy_clone) {
5343 expr->ops->destroy_clone(ctx, expr);
5344 module_put(expr->ops->type->owner);
5345 } else {
5346 nf_tables_expr_destroy(ctx, expr);
5347 }
5348}
5349
5350static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5351 struct nft_set_elem_expr *elem_expr)
5352{
5353 struct nft_expr *expr;
5354 u32 size;
5355
5356 nft_setelem_expr_foreach(expr, elem_expr, size)
5357 __nft_set_elem_expr_destroy(ctx, expr);
5358}
5359
5360void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5361 bool destroy_expr)
5362{
5363 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5364 struct nft_ctx ctx = {
5365 .net = read_pnet(&set->net),
5366 .family = set->table->family,
5367 };
5368
5369 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5370 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5371 nft_data_release(nft_set_ext_data(ext), set->dtype);
5372 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5373 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5374
5375 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5376 (*nft_set_ext_obj(ext))->use--;
5377 kfree(elem);
5378}
5379EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5380
5381
5382
5383
5384static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5385 const struct nft_set *set, void *elem)
5386{
5387 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5388
5389 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5390 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5391
5392 kfree(elem);
5393}
5394
5395int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5396 struct nft_expr *expr_array[])
5397{
5398 struct nft_expr *expr;
5399 int err, i, k;
5400
5401 for (i = 0; i < set->num_exprs; i++) {
5402 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5403 if (!expr)
5404 goto err_expr;
5405
5406 err = nft_expr_clone(expr, set->exprs[i]);
5407 if (err < 0) {
5408 nft_expr_destroy(ctx, expr);
5409 goto err_expr;
5410 }
5411 expr_array[i] = expr;
5412 }
5413
5414 return 0;
5415
5416err_expr:
5417 for (k = i - 1; k >= 0; k--)
5418 nft_expr_destroy(ctx, expr_array[k]);
5419
5420 return -ENOMEM;
5421}
5422
5423static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5424 const struct nft_set_ext *ext,
5425 struct nft_expr *expr_array[],
5426 u32 num_exprs)
5427{
5428 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5429 struct nft_expr *expr;
5430 int i, err;
5431
5432 for (i = 0; i < num_exprs; i++) {
5433 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5434 err = nft_expr_clone(expr, expr_array[i]);
5435 if (err < 0)
5436 goto err_elem_expr_setup;
5437
5438 elem_expr->size += expr_array[i]->ops->size;
5439 nft_expr_destroy(ctx, expr_array[i]);
5440 expr_array[i] = NULL;
5441 }
5442
5443 return 0;
5444
5445err_elem_expr_setup:
5446 for (; i < num_exprs; i++) {
5447 nft_expr_destroy(ctx, expr_array[i]);
5448 expr_array[i] = NULL;
5449 }
5450
5451 return -ENOMEM;
5452}
5453
5454struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5455 const struct nft_set *set)
5456{
5457 struct nft_set_elem_catchall *catchall;
5458 u8 genmask = nft_genmask_cur(net);
5459 struct nft_set_ext *ext;
5460
5461 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5462 ext = nft_set_elem_ext(set, catchall->elem);
5463 if (nft_set_elem_active(ext, genmask) &&
5464 !nft_set_elem_expired(ext))
5465 return ext;
5466 }
5467
5468 return NULL;
5469}
5470EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5471
5472void *nft_set_catchall_gc(const struct nft_set *set)
5473{
5474 struct nft_set_elem_catchall *catchall, *next;
5475 struct nft_set_ext *ext;
5476 void *elem = NULL;
5477
5478 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5479 ext = nft_set_elem_ext(set, catchall->elem);
5480
5481 if (!nft_set_elem_expired(ext) ||
5482 nft_set_elem_mark_busy(ext))
5483 continue;
5484
5485 elem = catchall->elem;
5486 list_del_rcu(&catchall->list);
5487 kfree_rcu(catchall, rcu);
5488 break;
5489 }
5490
5491 return elem;
5492}
5493EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5494
5495static int nft_setelem_catchall_insert(const struct net *net,
5496 struct nft_set *set,
5497 const struct nft_set_elem *elem,
5498 struct nft_set_ext **pext)
5499{
5500 struct nft_set_elem_catchall *catchall;
5501 u8 genmask = nft_genmask_next(net);
5502 struct nft_set_ext *ext;
5503
5504 list_for_each_entry(catchall, &set->catchall_list, list) {
5505 ext = nft_set_elem_ext(set, catchall->elem);
5506 if (nft_set_elem_active(ext, genmask)) {
5507 *pext = ext;
5508 return -EEXIST;
5509 }
5510 }
5511
5512 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5513 if (!catchall)
5514 return -ENOMEM;
5515
5516 catchall->elem = elem->priv;
5517 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5518
5519 return 0;
5520}
5521
5522static int nft_setelem_insert(const struct net *net,
5523 struct nft_set *set,
5524 const struct nft_set_elem *elem,
5525 struct nft_set_ext **ext, unsigned int flags)
5526{
5527 int ret;
5528
5529 if (flags & NFT_SET_ELEM_CATCHALL)
5530 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5531 else
5532 ret = set->ops->insert(net, set, elem, ext);
5533
5534 return ret;
5535}
5536
5537static bool nft_setelem_is_catchall(const struct nft_set *set,
5538 const struct nft_set_elem *elem)
5539{
5540 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5541
5542 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5543 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5544 return true;
5545
5546 return false;
5547}
5548
5549static void nft_setelem_activate(struct net *net, struct nft_set *set,
5550 struct nft_set_elem *elem)
5551{
5552 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5553
5554 if (nft_setelem_is_catchall(set, elem)) {
5555 nft_set_elem_change_active(net, set, ext);
5556 nft_set_elem_clear_busy(ext);
5557 } else {
5558 set->ops->activate(net, set, elem);
5559 }
5560}
5561
5562static int nft_setelem_catchall_deactivate(const struct net *net,
5563 struct nft_set *set,
5564 struct nft_set_elem *elem)
5565{
5566 struct nft_set_elem_catchall *catchall;
5567 struct nft_set_ext *ext;
5568
5569 list_for_each_entry(catchall, &set->catchall_list, list) {
5570 ext = nft_set_elem_ext(set, catchall->elem);
5571 if (!nft_is_active(net, ext) ||
5572 nft_set_elem_mark_busy(ext))
5573 continue;
5574
5575 kfree(elem->priv);
5576 elem->priv = catchall->elem;
5577 nft_set_elem_change_active(net, set, ext);
5578 return 0;
5579 }
5580
5581 return -ENOENT;
5582}
5583
5584static int __nft_setelem_deactivate(const struct net *net,
5585 struct nft_set *set,
5586 struct nft_set_elem *elem)
5587{
5588 void *priv;
5589
5590 priv = set->ops->deactivate(net, set, elem);
5591 if (!priv)
5592 return -ENOENT;
5593
5594 kfree(elem->priv);
5595 elem->priv = priv;
5596 set->ndeact++;
5597
5598 return 0;
5599}
5600
5601static int nft_setelem_deactivate(const struct net *net,
5602 struct nft_set *set,
5603 struct nft_set_elem *elem, u32 flags)
5604{
5605 int ret;
5606
5607 if (flags & NFT_SET_ELEM_CATCHALL)
5608 ret = nft_setelem_catchall_deactivate(net, set, elem);
5609 else
5610 ret = __nft_setelem_deactivate(net, set, elem);
5611
5612 return ret;
5613}
5614
5615static void nft_setelem_catchall_remove(const struct net *net,
5616 const struct nft_set *set,
5617 const struct nft_set_elem *elem)
5618{
5619 struct nft_set_elem_catchall *catchall, *next;
5620
5621 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5622 if (catchall->elem == elem->priv) {
5623 list_del_rcu(&catchall->list);
5624 kfree_rcu(catchall);
5625 break;
5626 }
5627 }
5628}
5629
5630static void nft_setelem_remove(const struct net *net,
5631 const struct nft_set *set,
5632 const struct nft_set_elem *elem)
5633{
5634 if (nft_setelem_is_catchall(set, elem))
5635 nft_setelem_catchall_remove(net, set, elem);
5636 else
5637 set->ops->remove(net, set, elem);
5638}
5639
5640static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5641 const struct nlattr *attr, u32 nlmsg_flags)
5642{
5643 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5644 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5645 u8 genmask = nft_genmask_next(ctx->net);
5646 u32 flags = 0, size = 0, num_exprs = 0;
5647 struct nft_set_ext_tmpl tmpl;
5648 struct nft_set_ext *ext, *ext2;
5649 struct nft_set_elem elem;
5650 struct nft_set_binding *binding;
5651 struct nft_object *obj = NULL;
5652 struct nft_userdata *udata;
5653 struct nft_data_desc desc;
5654 enum nft_registers dreg;
5655 struct nft_trans *trans;
5656 u64 timeout;
5657 u64 expiration;
5658 int err, i;
5659 u8 ulen;
5660
5661 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5662 nft_set_elem_policy, NULL);
5663 if (err < 0)
5664 return err;
5665
5666 nft_set_ext_prepare(&tmpl);
5667
5668 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5669 if (err < 0)
5670 return err;
5671
5672 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5673 return -EINVAL;
5674
5675 if (flags != 0)
5676 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5677
5678 if (set->flags & NFT_SET_MAP) {
5679 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5680 !(flags & NFT_SET_ELEM_INTERVAL_END))
5681 return -EINVAL;
5682 } else {
5683 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5684 return -EINVAL;
5685 }
5686
5687 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5688 (nla[NFTA_SET_ELEM_DATA] ||
5689 nla[NFTA_SET_ELEM_OBJREF] ||
5690 nla[NFTA_SET_ELEM_TIMEOUT] ||
5691 nla[NFTA_SET_ELEM_EXPIRATION] ||
5692 nla[NFTA_SET_ELEM_USERDATA] ||
5693 nla[NFTA_SET_ELEM_EXPR] ||
5694 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5695 return -EINVAL;
5696
5697 timeout = 0;
5698 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5699 if (!(set->flags & NFT_SET_TIMEOUT))
5700 return -EINVAL;
5701 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5702 &timeout);
5703 if (err)
5704 return err;
5705 } else if (set->flags & NFT_SET_TIMEOUT) {
5706 timeout = set->timeout;
5707 }
5708
5709 expiration = 0;
5710 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5711 if (!(set->flags & NFT_SET_TIMEOUT))
5712 return -EINVAL;
5713 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5714 &expiration);
5715 if (err)
5716 return err;
5717 }
5718
5719 if (nla[NFTA_SET_ELEM_EXPR]) {
5720 struct nft_expr *expr;
5721
5722 if (set->num_exprs && set->num_exprs != 1)
5723 return -EOPNOTSUPP;
5724
5725 expr = nft_set_elem_expr_alloc(ctx, set,
5726 nla[NFTA_SET_ELEM_EXPR]);
5727 if (IS_ERR(expr))
5728 return PTR_ERR(expr);
5729
5730 expr_array[0] = expr;
5731 num_exprs = 1;
5732
5733 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5734 err = -EOPNOTSUPP;
5735 goto err_set_elem_expr;
5736 }
5737 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5738 struct nft_expr *expr;
5739 struct nlattr *tmp;
5740 int left;
5741
5742 i = 0;
5743 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5744 if (i == NFT_SET_EXPR_MAX ||
5745 (set->num_exprs && set->num_exprs == i)) {
5746 err = -E2BIG;
5747 goto err_set_elem_expr;
5748 }
5749 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5750 err = -EINVAL;
5751 goto err_set_elem_expr;
5752 }
5753 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5754 if (IS_ERR(expr)) {
5755 err = PTR_ERR(expr);
5756 goto err_set_elem_expr;
5757 }
5758 expr_array[i] = expr;
5759 num_exprs++;
5760
5761 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5762 err = -EOPNOTSUPP;
5763 goto err_set_elem_expr;
5764 }
5765 i++;
5766 }
5767 if (set->num_exprs && set->num_exprs != i) {
5768 err = -EOPNOTSUPP;
5769 goto err_set_elem_expr;
5770 }
5771 } else if (set->num_exprs > 0) {
5772 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5773 if (err < 0)
5774 goto err_set_elem_expr_clone;
5775
5776 num_exprs = set->num_exprs;
5777 }
5778
5779 if (nla[NFTA_SET_ELEM_KEY]) {
5780 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5781 nla[NFTA_SET_ELEM_KEY]);
5782 if (err < 0)
5783 goto err_set_elem_expr;
5784
5785 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5786 }
5787
5788 if (nla[NFTA_SET_ELEM_KEY_END]) {
5789 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5790 nla[NFTA_SET_ELEM_KEY_END]);
5791 if (err < 0)
5792 goto err_parse_key;
5793
5794 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5795 }
5796
5797 if (timeout > 0) {
5798 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5799 if (timeout != set->timeout)
5800 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5801 }
5802
5803 if (num_exprs) {
5804 for (i = 0; i < num_exprs; i++)
5805 size += expr_array[i]->ops->size;
5806
5807 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5808 sizeof(struct nft_set_elem_expr) +
5809 size);
5810 }
5811
5812 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5813 if (!(set->flags & NFT_SET_OBJECT)) {
5814 err = -EINVAL;
5815 goto err_parse_key_end;
5816 }
5817 obj = nft_obj_lookup(ctx->net, ctx->table,
5818 nla[NFTA_SET_ELEM_OBJREF],
5819 set->objtype, genmask);
5820 if (IS_ERR(obj)) {
5821 err = PTR_ERR(obj);
5822 goto err_parse_key_end;
5823 }
5824 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5825 }
5826
5827 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5828 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5829 nla[NFTA_SET_ELEM_DATA]);
5830 if (err < 0)
5831 goto err_parse_key_end;
5832
5833 dreg = nft_type_to_reg(set->dtype);
5834 list_for_each_entry(binding, &set->bindings, list) {
5835 struct nft_ctx bind_ctx = {
5836 .net = ctx->net,
5837 .family = ctx->family,
5838 .table = ctx->table,
5839 .chain = (struct nft_chain *)binding->chain,
5840 };
5841
5842 if (!(binding->flags & NFT_SET_MAP))
5843 continue;
5844
5845 err = nft_validate_register_store(&bind_ctx, dreg,
5846 &elem.data.val,
5847 desc.type, desc.len);
5848 if (err < 0)
5849 goto err_parse_data;
5850
5851 if (desc.type == NFT_DATA_VERDICT &&
5852 (elem.data.val.verdict.code == NFT_GOTO ||
5853 elem.data.val.verdict.code == NFT_JUMP))
5854 nft_validate_state_update(ctx->net,
5855 NFT_VALIDATE_NEED);
5856 }
5857
5858 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5859 }
5860
5861
5862
5863
5864
5865 ulen = 0;
5866 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5867 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5868 if (ulen > 0)
5869 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5870 ulen);
5871 }
5872
5873 err = -ENOMEM;
5874 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5875 elem.key_end.val.data, elem.data.val.data,
5876 timeout, expiration, GFP_KERNEL);
5877 if (elem.priv == NULL)
5878 goto err_parse_data;
5879
5880 ext = nft_set_elem_ext(set, elem.priv);
5881 if (flags)
5882 *nft_set_ext_flags(ext) = flags;
5883 if (ulen > 0) {
5884 udata = nft_set_ext_userdata(ext);
5885 udata->len = ulen - 1;
5886 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5887 }
5888 if (obj) {
5889 *nft_set_ext_obj(ext) = obj;
5890 obj->use++;
5891 }
5892 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5893 if (err < 0)
5894 goto err_elem_expr;
5895
5896 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5897 if (trans == NULL) {
5898 err = -ENOMEM;
5899 goto err_elem_expr;
5900 }
5901
5902 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5903
5904 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
5905 if (err) {
5906 if (err == -EEXIST) {
5907 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5908 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5909 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5910 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5911 goto err_element_clash;
5912 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5913 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5914 memcmp(nft_set_ext_data(ext),
5915 nft_set_ext_data(ext2), set->dlen) != 0) ||
5916 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5917 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5918 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5919 goto err_element_clash;
5920 else if (!(nlmsg_flags & NLM_F_EXCL))
5921 err = 0;
5922 } else if (err == -ENOTEMPTY) {
5923
5924
5925
5926 err = -EEXIST;
5927 }
5928 goto err_element_clash;
5929 }
5930
5931 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
5932 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5933 err = -ENFILE;
5934 goto err_set_full;
5935 }
5936
5937 nft_trans_elem(trans) = elem;
5938 nft_trans_commit_list_add_tail(ctx->net, trans);
5939 return 0;
5940
5941err_set_full:
5942 nft_setelem_remove(ctx->net, set, &elem);
5943err_element_clash:
5944 kfree(trans);
5945err_elem_expr:
5946 if (obj)
5947 obj->use--;
5948
5949 nf_tables_set_elem_destroy(ctx, set, elem.priv);
5950err_parse_data:
5951 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5952 nft_data_release(&elem.data.val, desc.type);
5953err_parse_key_end:
5954 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5955err_parse_key:
5956 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5957err_set_elem_expr:
5958 for (i = 0; i < num_exprs && expr_array[i]; i++)
5959 nft_expr_destroy(ctx, expr_array[i]);
5960err_set_elem_expr_clone:
5961 return err;
5962}
5963
5964static int nf_tables_newsetelem(struct sk_buff *skb,
5965 const struct nfnl_info *info,
5966 const struct nlattr * const nla[])
5967{
5968 struct nftables_pernet *nft_net = nft_pernet(info->net);
5969 struct netlink_ext_ack *extack = info->extack;
5970 u8 genmask = nft_genmask_next(info->net);
5971 u8 family = info->nfmsg->nfgen_family;
5972 struct net *net = info->net;
5973 const struct nlattr *attr;
5974 struct nft_table *table;
5975 struct nft_set *set;
5976 struct nft_ctx ctx;
5977 int rem, err;
5978
5979 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5980 return -EINVAL;
5981
5982 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5983 genmask, NETLINK_CB(skb).portid);
5984 if (IS_ERR(table)) {
5985 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5986 return PTR_ERR(table);
5987 }
5988
5989 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
5990 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5991 if (IS_ERR(set))
5992 return PTR_ERR(set);
5993
5994 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5995 return -EBUSY;
5996
5997 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5998
5999 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6000 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6001 if (err < 0)
6002 return err;
6003 }
6004
6005 if (nft_net->validate_state == NFT_VALIDATE_DO)
6006 return nft_table_validate(net, table);
6007
6008 return 0;
6009}
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6023{
6024 struct nft_chain *chain;
6025 struct nft_rule *rule;
6026
6027 if (type == NFT_DATA_VERDICT) {
6028 switch (data->verdict.code) {
6029 case NFT_JUMP:
6030 case NFT_GOTO:
6031 chain = data->verdict.chain;
6032 chain->use++;
6033
6034 if (!nft_chain_is_bound(chain))
6035 break;
6036
6037 chain->table->use++;
6038 list_for_each_entry(rule, &chain->rules, list)
6039 chain->use++;
6040
6041 nft_chain_add(chain->table, chain);
6042 break;
6043 }
6044 }
6045}
6046
6047static void nft_setelem_data_activate(const struct net *net,
6048 const struct nft_set *set,
6049 struct nft_set_elem *elem)
6050{
6051 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6052
6053 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6054 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6055 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6056 (*nft_set_ext_obj(ext))->use++;
6057}
6058
6059static void nft_setelem_data_deactivate(const struct net *net,
6060 const struct nft_set *set,
6061 struct nft_set_elem *elem)
6062{
6063 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6064
6065 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6066 nft_data_release(nft_set_ext_data(ext), set->dtype);
6067 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6068 (*nft_set_ext_obj(ext))->use--;
6069}
6070
6071static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6072 const struct nlattr *attr)
6073{
6074 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6075 struct nft_set_ext_tmpl tmpl;
6076 struct nft_set_elem elem;
6077 struct nft_set_ext *ext;
6078 struct nft_trans *trans;
6079 u32 flags = 0;
6080 int err;
6081
6082 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6083 nft_set_elem_policy, NULL);
6084 if (err < 0)
6085 return err;
6086
6087 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6088 if (err < 0)
6089 return err;
6090
6091 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6092 return -EINVAL;
6093
6094 nft_set_ext_prepare(&tmpl);
6095
6096 if (flags != 0)
6097 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6098
6099 if (nla[NFTA_SET_ELEM_KEY]) {
6100 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6101 nla[NFTA_SET_ELEM_KEY]);
6102 if (err < 0)
6103 return err;
6104
6105 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6106 }
6107
6108 if (nla[NFTA_SET_ELEM_KEY_END]) {
6109 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6110 nla[NFTA_SET_ELEM_KEY_END]);
6111 if (err < 0)
6112 return err;
6113
6114 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6115 }
6116
6117 err = -ENOMEM;
6118 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6119 elem.key_end.val.data, NULL, 0, 0,
6120 GFP_KERNEL);
6121 if (elem.priv == NULL)
6122 goto fail_elem;
6123
6124 ext = nft_set_elem_ext(set, elem.priv);
6125 if (flags)
6126 *nft_set_ext_flags(ext) = flags;
6127
6128 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6129 if (trans == NULL)
6130 goto fail_trans;
6131
6132 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6133 if (err < 0)
6134 goto fail_ops;
6135
6136 nft_setelem_data_deactivate(ctx->net, set, &elem);
6137
6138 nft_trans_elem(trans) = elem;
6139 nft_trans_commit_list_add_tail(ctx->net, trans);
6140 return 0;
6141
6142fail_ops:
6143 kfree(trans);
6144fail_trans:
6145 kfree(elem.priv);
6146fail_elem:
6147 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6148 return err;
6149}
6150
6151static int nft_setelem_flush(const struct nft_ctx *ctx,
6152 struct nft_set *set,
6153 const struct nft_set_iter *iter,
6154 struct nft_set_elem *elem)
6155{
6156 struct nft_trans *trans;
6157 int err;
6158
6159 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6160 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6161 if (!trans)
6162 return -ENOMEM;
6163
6164 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6165 err = -ENOENT;
6166 goto err1;
6167 }
6168 set->ndeact++;
6169
6170 nft_setelem_data_deactivate(ctx->net, set, elem);
6171 nft_trans_elem_set(trans) = set;
6172 nft_trans_elem(trans) = *elem;
6173 nft_trans_commit_list_add_tail(ctx->net, trans);
6174
6175 return 0;
6176err1:
6177 kfree(trans);
6178 return err;
6179}
6180
6181static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6182 struct nft_set *set,
6183 struct nft_set_elem *elem)
6184{
6185 struct nft_trans *trans;
6186
6187 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6188 sizeof(struct nft_trans_elem), GFP_KERNEL);
6189 if (!trans)
6190 return -ENOMEM;
6191
6192 nft_setelem_data_deactivate(ctx->net, set, elem);
6193 nft_trans_elem_set(trans) = set;
6194 nft_trans_elem(trans) = *elem;
6195 nft_trans_commit_list_add_tail(ctx->net, trans);
6196
6197 return 0;
6198}
6199
6200static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6201 struct nft_set *set)
6202{
6203 u8 genmask = nft_genmask_next(ctx->net);
6204 struct nft_set_elem_catchall *catchall;
6205 struct nft_set_elem elem;
6206 struct nft_set_ext *ext;
6207 int ret = 0;
6208
6209 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6210 ext = nft_set_elem_ext(set, catchall->elem);
6211 if (!nft_set_elem_active(ext, genmask) ||
6212 nft_set_elem_mark_busy(ext))
6213 continue;
6214
6215 elem.priv = catchall->elem;
6216 ret = __nft_set_catchall_flush(ctx, set, &elem);
6217 if (ret < 0)
6218 break;
6219 }
6220
6221 return ret;
6222}
6223
6224static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6225{
6226 struct nft_set_iter iter = {
6227 .genmask = genmask,
6228 .fn = nft_setelem_flush,
6229 };
6230
6231 set->ops->walk(ctx, set, &iter);
6232 if (!iter.err)
6233 iter.err = nft_set_catchall_flush(ctx, set);
6234
6235 return iter.err;
6236}
6237
6238static int nf_tables_delsetelem(struct sk_buff *skb,
6239 const struct nfnl_info *info,
6240 const struct nlattr * const nla[])
6241{
6242 struct netlink_ext_ack *extack = info->extack;
6243 u8 genmask = nft_genmask_next(info->net);
6244 u8 family = info->nfmsg->nfgen_family;
6245 struct net *net = info->net;
6246 const struct nlattr *attr;
6247 struct nft_table *table;
6248 struct nft_set *set;
6249 struct nft_ctx ctx;
6250 int rem, err = 0;
6251
6252 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6253 genmask, NETLINK_CB(skb).portid);
6254 if (IS_ERR(table)) {
6255 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6256 return PTR_ERR(table);
6257 }
6258
6259 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6260 if (IS_ERR(set))
6261 return PTR_ERR(set);
6262 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6263 return -EBUSY;
6264
6265 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6266
6267 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6268 return nft_set_flush(&ctx, set, genmask);
6269
6270 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6271 err = nft_del_setelem(&ctx, set, attr);
6272 if (err < 0)
6273 break;
6274 }
6275 return err;
6276}
6277
6278void nft_set_gc_batch_release(struct rcu_head *rcu)
6279{
6280 struct nft_set_gc_batch *gcb;
6281 unsigned int i;
6282
6283 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6284 for (i = 0; i < gcb->head.cnt; i++)
6285 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6286 kfree(gcb);
6287}
6288
6289struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6290 gfp_t gfp)
6291{
6292 struct nft_set_gc_batch *gcb;
6293
6294 gcb = kzalloc(sizeof(*gcb), gfp);
6295 if (gcb == NULL)
6296 return gcb;
6297 gcb->head.set = set;
6298 return gcb;
6299}
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312int nft_register_obj(struct nft_object_type *obj_type)
6313{
6314 if (obj_type->type == NFT_OBJECT_UNSPEC)
6315 return -EINVAL;
6316
6317 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6318 list_add_rcu(&obj_type->list, &nf_tables_objects);
6319 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6320 return 0;
6321}
6322EXPORT_SYMBOL_GPL(nft_register_obj);
6323
6324
6325
6326
6327
6328
6329
6330void nft_unregister_obj(struct nft_object_type *obj_type)
6331{
6332 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6333 list_del_rcu(&obj_type->list);
6334 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6335}
6336EXPORT_SYMBOL_GPL(nft_unregister_obj);
6337
6338struct nft_object *nft_obj_lookup(const struct net *net,
6339 const struct nft_table *table,
6340 const struct nlattr *nla, u32 objtype,
6341 u8 genmask)
6342{
6343 struct nft_object_hash_key k = { .table = table };
6344 char search[NFT_OBJ_MAXNAMELEN];
6345 struct rhlist_head *tmp, *list;
6346 struct nft_object *obj;
6347
6348 nla_strscpy(search, nla, sizeof(search));
6349 k.name = search;
6350
6351 WARN_ON_ONCE(!rcu_read_lock_held() &&
6352 !lockdep_commit_lock_is_held(net));
6353
6354 rcu_read_lock();
6355 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6356 if (!list)
6357 goto out;
6358
6359 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6360 if (objtype == obj->ops->type->type &&
6361 nft_active_genmask(obj, genmask)) {
6362 rcu_read_unlock();
6363 return obj;
6364 }
6365 }
6366out:
6367 rcu_read_unlock();
6368 return ERR_PTR(-ENOENT);
6369}
6370EXPORT_SYMBOL_GPL(nft_obj_lookup);
6371
6372static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6373 const struct nlattr *nla,
6374 u32 objtype, u8 genmask)
6375{
6376 struct nft_object *obj;
6377
6378 list_for_each_entry(obj, &table->objects, list) {
6379 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6380 objtype == obj->ops->type->type &&
6381 nft_active_genmask(obj, genmask))
6382 return obj;
6383 }
6384 return ERR_PTR(-ENOENT);
6385}
6386
6387static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6388 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6389 .len = NFT_TABLE_MAXNAMELEN - 1 },
6390 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6391 .len = NFT_OBJ_MAXNAMELEN - 1 },
6392 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6393 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6394 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6395 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6396 .len = NFT_USERDATA_MAXLEN },
6397};
6398
6399static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6400 const struct nft_object_type *type,
6401 const struct nlattr *attr)
6402{
6403 struct nlattr **tb;
6404 const struct nft_object_ops *ops;
6405 struct nft_object *obj;
6406 int err = -ENOMEM;
6407
6408 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6409 if (!tb)
6410 goto err1;
6411
6412 if (attr) {
6413 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6414 type->policy, NULL);
6415 if (err < 0)
6416 goto err2;
6417 } else {
6418 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6419 }
6420
6421 if (type->select_ops) {
6422 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6423 if (IS_ERR(ops)) {
6424 err = PTR_ERR(ops);
6425 goto err2;
6426 }
6427 } else {
6428 ops = type->ops;
6429 }
6430
6431 err = -ENOMEM;
6432 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6433 if (!obj)
6434 goto err2;
6435
6436 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6437 if (err < 0)
6438 goto err3;
6439
6440 obj->ops = ops;
6441
6442 kfree(tb);
6443 return obj;
6444err3:
6445 kfree(obj);
6446err2:
6447 kfree(tb);
6448err1:
6449 return ERR_PTR(err);
6450}
6451
6452static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6453 struct nft_object *obj, bool reset)
6454{
6455 struct nlattr *nest;
6456
6457 nest = nla_nest_start_noflag(skb, attr);
6458 if (!nest)
6459 goto nla_put_failure;
6460 if (obj->ops->dump(skb, obj, reset) < 0)
6461 goto nla_put_failure;
6462 nla_nest_end(skb, nest);
6463 return 0;
6464
6465nla_put_failure:
6466 return -1;
6467}
6468
6469static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6470{
6471 const struct nft_object_type *type;
6472
6473 list_for_each_entry(type, &nf_tables_objects, list) {
6474 if (objtype == type->type)
6475 return type;
6476 }
6477 return NULL;
6478}
6479
6480static const struct nft_object_type *
6481nft_obj_type_get(struct net *net, u32 objtype)
6482{
6483 const struct nft_object_type *type;
6484
6485 type = __nft_obj_type_get(objtype);
6486 if (type != NULL && try_module_get(type->owner))
6487 return type;
6488
6489 lockdep_nfnl_nft_mutex_not_held();
6490#ifdef CONFIG_MODULES
6491 if (type == NULL) {
6492 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6493 return ERR_PTR(-EAGAIN);
6494 }
6495#endif
6496 return ERR_PTR(-ENOENT);
6497}
6498
6499static int nf_tables_updobj(const struct nft_ctx *ctx,
6500 const struct nft_object_type *type,
6501 const struct nlattr *attr,
6502 struct nft_object *obj)
6503{
6504 struct nft_object *newobj;
6505 struct nft_trans *trans;
6506 int err;
6507
6508 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6509 sizeof(struct nft_trans_obj));
6510 if (!trans)
6511 return -ENOMEM;
6512
6513 newobj = nft_obj_init(ctx, type, attr);
6514 if (IS_ERR(newobj)) {
6515 err = PTR_ERR(newobj);
6516 goto err_free_trans;
6517 }
6518
6519 nft_trans_obj(trans) = obj;
6520 nft_trans_obj_update(trans) = true;
6521 nft_trans_obj_newobj(trans) = newobj;
6522 nft_trans_commit_list_add_tail(ctx->net, trans);
6523
6524 return 0;
6525
6526err_free_trans:
6527 kfree(trans);
6528 return err;
6529}
6530
6531static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6532 const struct nlattr * const nla[])
6533{
6534 struct netlink_ext_ack *extack = info->extack;
6535 u8 genmask = nft_genmask_next(info->net);
6536 u8 family = info->nfmsg->nfgen_family;
6537 const struct nft_object_type *type;
6538 struct net *net = info->net;
6539 struct nft_table *table;
6540 struct nft_object *obj;
6541 struct nft_ctx ctx;
6542 u32 objtype;
6543 int err;
6544
6545 if (!nla[NFTA_OBJ_TYPE] ||
6546 !nla[NFTA_OBJ_NAME] ||
6547 !nla[NFTA_OBJ_DATA])
6548 return -EINVAL;
6549
6550 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6551 NETLINK_CB(skb).portid);
6552 if (IS_ERR(table)) {
6553 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6554 return PTR_ERR(table);
6555 }
6556
6557 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6558 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6559 if (IS_ERR(obj)) {
6560 err = PTR_ERR(obj);
6561 if (err != -ENOENT) {
6562 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6563 return err;
6564 }
6565 } else {
6566 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6567 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6568 return -EEXIST;
6569 }
6570 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6571 return -EOPNOTSUPP;
6572
6573 type = __nft_obj_type_get(objtype);
6574 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6575
6576 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6577 }
6578
6579 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6580
6581 type = nft_obj_type_get(net, objtype);
6582 if (IS_ERR(type))
6583 return PTR_ERR(type);
6584
6585 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6586 if (IS_ERR(obj)) {
6587 err = PTR_ERR(obj);
6588 goto err_init;
6589 }
6590 obj->key.table = table;
6591 obj->handle = nf_tables_alloc_handle(table);
6592
6593 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6594 if (!obj->key.name) {
6595 err = -ENOMEM;
6596 goto err_strdup;
6597 }
6598
6599 if (nla[NFTA_OBJ_USERDATA]) {
6600 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6601 if (obj->udata == NULL)
6602 goto err_userdata;
6603
6604 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6605 }
6606
6607 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6608 if (err < 0)
6609 goto err_trans;
6610
6611 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6612 nft_objname_ht_params);
6613 if (err < 0)
6614 goto err_obj_ht;
6615
6616 list_add_tail_rcu(&obj->list, &table->objects);
6617 table->use++;
6618 return 0;
6619err_obj_ht:
6620
6621 INIT_LIST_HEAD(&obj->list);
6622 return err;
6623err_trans:
6624 kfree(obj->udata);
6625err_userdata:
6626 kfree(obj->key.name);
6627err_strdup:
6628 if (obj->ops->destroy)
6629 obj->ops->destroy(&ctx, obj);
6630 kfree(obj);
6631err_init:
6632 module_put(type->owner);
6633 return err;
6634}
6635
6636static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6637 u32 portid, u32 seq, int event, u32 flags,
6638 int family, const struct nft_table *table,
6639 struct nft_object *obj, bool reset)
6640{
6641 struct nlmsghdr *nlh;
6642
6643 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6644 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6645 NFNETLINK_V0, nft_base_seq(net));
6646 if (!nlh)
6647 goto nla_put_failure;
6648
6649 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6650 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6651 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6652 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6653 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6654 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6655 NFTA_OBJ_PAD))
6656 goto nla_put_failure;
6657
6658 if (obj->udata &&
6659 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6660 goto nla_put_failure;
6661
6662 nlmsg_end(skb, nlh);
6663 return 0;
6664
6665nla_put_failure:
6666 nlmsg_trim(skb, nlh);
6667 return -1;
6668}
6669
6670struct nft_obj_filter {
6671 char *table;
6672 u32 type;
6673};
6674
6675static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6676{
6677 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6678 const struct nft_table *table;
6679 unsigned int idx = 0, s_idx = cb->args[0];
6680 struct nft_obj_filter *filter = cb->data;
6681 struct net *net = sock_net(skb->sk);
6682 int family = nfmsg->nfgen_family;
6683 struct nftables_pernet *nft_net;
6684 struct nft_object *obj;
6685 bool reset = false;
6686
6687 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6688 reset = true;
6689
6690 rcu_read_lock();
6691 nft_net = nft_pernet(net);
6692 cb->seq = nft_net->base_seq;
6693
6694 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6695 if (family != NFPROTO_UNSPEC && family != table->family)
6696 continue;
6697
6698 list_for_each_entry_rcu(obj, &table->objects, list) {
6699 if (!nft_is_active(net, obj))
6700 goto cont;
6701 if (idx < s_idx)
6702 goto cont;
6703 if (idx > s_idx)
6704 memset(&cb->args[1], 0,
6705 sizeof(cb->args) - sizeof(cb->args[0]));
6706 if (filter && filter->table &&
6707 strcmp(filter->table, table->name))
6708 goto cont;
6709 if (filter &&
6710 filter->type != NFT_OBJECT_UNSPEC &&
6711 obj->ops->type->type != filter->type)
6712 goto cont;
6713 if (reset) {
6714 char *buf = kasprintf(GFP_ATOMIC,
6715 "%s:%u",
6716 table->name,
6717 nft_net->base_seq);
6718
6719 audit_log_nfcfg(buf,
6720 family,
6721 obj->handle,
6722 AUDIT_NFT_OP_OBJ_RESET,
6723 GFP_ATOMIC);
6724 kfree(buf);
6725 }
6726
6727 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6728 cb->nlh->nlmsg_seq,
6729 NFT_MSG_NEWOBJ,
6730 NLM_F_MULTI | NLM_F_APPEND,
6731 table->family, table,
6732 obj, reset) < 0)
6733 goto done;
6734
6735 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6736cont:
6737 idx++;
6738 }
6739 }
6740done:
6741 rcu_read_unlock();
6742
6743 cb->args[0] = idx;
6744 return skb->len;
6745}
6746
6747static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6748{
6749 const struct nlattr * const *nla = cb->data;
6750 struct nft_obj_filter *filter = NULL;
6751
6752 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6753 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6754 if (!filter)
6755 return -ENOMEM;
6756
6757 if (nla[NFTA_OBJ_TABLE]) {
6758 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6759 if (!filter->table) {
6760 kfree(filter);
6761 return -ENOMEM;
6762 }
6763 }
6764
6765 if (nla[NFTA_OBJ_TYPE])
6766 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6767 }
6768
6769 cb->data = filter;
6770 return 0;
6771}
6772
6773static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6774{
6775 struct nft_obj_filter *filter = cb->data;
6776
6777 if (filter) {
6778 kfree(filter->table);
6779 kfree(filter);
6780 }
6781
6782 return 0;
6783}
6784
6785
6786static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6787 const struct nlattr * const nla[])
6788{
6789 struct netlink_ext_ack *extack = info->extack;
6790 u8 genmask = nft_genmask_cur(info->net);
6791 u8 family = info->nfmsg->nfgen_family;
6792 const struct nft_table *table;
6793 struct net *net = info->net;
6794 struct nft_object *obj;
6795 struct sk_buff *skb2;
6796 bool reset = false;
6797 u32 objtype;
6798 int err;
6799
6800 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6801 struct netlink_dump_control c = {
6802 .start = nf_tables_dump_obj_start,
6803 .dump = nf_tables_dump_obj,
6804 .done = nf_tables_dump_obj_done,
6805 .module = THIS_MODULE,
6806 .data = (void *)nla,
6807 };
6808
6809 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6810 }
6811
6812 if (!nla[NFTA_OBJ_NAME] ||
6813 !nla[NFTA_OBJ_TYPE])
6814 return -EINVAL;
6815
6816 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6817 if (IS_ERR(table)) {
6818 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6819 return PTR_ERR(table);
6820 }
6821
6822 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6823 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6824 if (IS_ERR(obj)) {
6825 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6826 return PTR_ERR(obj);
6827 }
6828
6829 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6830 if (!skb2)
6831 return -ENOMEM;
6832
6833 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6834 reset = true;
6835
6836 if (reset) {
6837 const struct nftables_pernet *nft_net;
6838 char *buf;
6839
6840 nft_net = nft_pernet(net);
6841 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6842
6843 audit_log_nfcfg(buf,
6844 family,
6845 obj->handle,
6846 AUDIT_NFT_OP_OBJ_RESET,
6847 GFP_ATOMIC);
6848 kfree(buf);
6849 }
6850
6851 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6852 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6853 family, table, obj, reset);
6854 if (err < 0)
6855 goto err_fill_obj_info;
6856
6857 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6858
6859err_fill_obj_info:
6860 kfree_skb(skb2);
6861 return err;
6862}
6863
6864static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6865{
6866 if (obj->ops->destroy)
6867 obj->ops->destroy(ctx, obj);
6868
6869 module_put(obj->ops->type->owner);
6870 kfree(obj->key.name);
6871 kfree(obj->udata);
6872 kfree(obj);
6873}
6874
6875static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6876 const struct nlattr * const nla[])
6877{
6878 struct netlink_ext_ack *extack = info->extack;
6879 u8 genmask = nft_genmask_next(info->net);
6880 u8 family = info->nfmsg->nfgen_family;
6881 struct net *net = info->net;
6882 const struct nlattr *attr;
6883 struct nft_table *table;
6884 struct nft_object *obj;
6885 struct nft_ctx ctx;
6886 u32 objtype;
6887
6888 if (!nla[NFTA_OBJ_TYPE] ||
6889 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6890 return -EINVAL;
6891
6892 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6893 NETLINK_CB(skb).portid);
6894 if (IS_ERR(table)) {
6895 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6896 return PTR_ERR(table);
6897 }
6898
6899 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6900 if (nla[NFTA_OBJ_HANDLE]) {
6901 attr = nla[NFTA_OBJ_HANDLE];
6902 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6903 } else {
6904 attr = nla[NFTA_OBJ_NAME];
6905 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6906 }
6907
6908 if (IS_ERR(obj)) {
6909 NL_SET_BAD_ATTR(extack, attr);
6910 return PTR_ERR(obj);
6911 }
6912 if (obj->use > 0) {
6913 NL_SET_BAD_ATTR(extack, attr);
6914 return -EBUSY;
6915 }
6916
6917 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6918
6919 return nft_delobj(&ctx, obj);
6920}
6921
6922void nft_obj_notify(struct net *net, const struct nft_table *table,
6923 struct nft_object *obj, u32 portid, u32 seq, int event,
6924 int family, int report, gfp_t gfp)
6925{
6926 struct nftables_pernet *nft_net = nft_pernet(net);
6927 struct sk_buff *skb;
6928 int err;
6929 char *buf = kasprintf(gfp, "%s:%u",
6930 table->name, nft_net->base_seq);
6931
6932 audit_log_nfcfg(buf,
6933 family,
6934 obj->handle,
6935 event == NFT_MSG_NEWOBJ ?
6936 AUDIT_NFT_OP_OBJ_REGISTER :
6937 AUDIT_NFT_OP_OBJ_UNREGISTER,
6938 gfp);
6939 kfree(buf);
6940
6941 if (!report &&
6942 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6943 return;
6944
6945 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6946 if (skb == NULL)
6947 goto err;
6948
6949 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6950 table, obj, false);
6951 if (err < 0) {
6952 kfree_skb(skb);
6953 goto err;
6954 }
6955
6956 nft_notify_enqueue(skb, report, &nft_net->notify_list);
6957 return;
6958err:
6959 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6960}
6961EXPORT_SYMBOL_GPL(nft_obj_notify);
6962
6963static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6964 struct nft_object *obj, int event)
6965{
6966 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6967 ctx->family, ctx->report, GFP_KERNEL);
6968}
6969
6970
6971
6972
6973void nft_register_flowtable_type(struct nf_flowtable_type *type)
6974{
6975 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6976 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6977 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6978}
6979EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6980
6981void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6982{
6983 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6984 list_del_rcu(&type->list);
6985 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6986}
6987EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6988
6989static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6990 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6991 .len = NFT_NAME_MAXLEN - 1 },
6992 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6993 .len = NFT_NAME_MAXLEN - 1 },
6994 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
6995 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
6996 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
6997};
6998
6999struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7000 const struct nlattr *nla, u8 genmask)
7001{
7002 struct nft_flowtable *flowtable;
7003
7004 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7005 if (!nla_strcmp(nla, flowtable->name) &&
7006 nft_active_genmask(flowtable, genmask))
7007 return flowtable;
7008 }
7009 return ERR_PTR(-ENOENT);
7010}
7011EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7012
7013void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7014 struct nft_flowtable *flowtable,
7015 enum nft_trans_phase phase)
7016{
7017 switch (phase) {
7018 case NFT_TRANS_PREPARE:
7019 case NFT_TRANS_ABORT:
7020 case NFT_TRANS_RELEASE:
7021 flowtable->use--;
7022 fallthrough;
7023 default:
7024 return;
7025 }
7026}
7027EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7028
7029static struct nft_flowtable *
7030nft_flowtable_lookup_byhandle(const struct nft_table *table,
7031 const struct nlattr *nla, u8 genmask)
7032{
7033 struct nft_flowtable *flowtable;
7034
7035 list_for_each_entry(flowtable, &table->flowtables, list) {
7036 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7037 nft_active_genmask(flowtable, genmask))
7038 return flowtable;
7039 }
7040 return ERR_PTR(-ENOENT);
7041}
7042
7043struct nft_flowtable_hook {
7044 u32 num;
7045 int priority;
7046 struct list_head list;
7047};
7048
7049static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7050 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7051 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7052 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7053};
7054
7055static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7056 const struct nlattr *attr,
7057 struct nft_flowtable_hook *flowtable_hook,
7058 struct nft_flowtable *flowtable, bool add)
7059{
7060 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7061 struct nft_hook *hook;
7062 int hooknum, priority;
7063 int err;
7064
7065 INIT_LIST_HEAD(&flowtable_hook->list);
7066
7067 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7068 nft_flowtable_hook_policy, NULL);
7069 if (err < 0)
7070 return err;
7071
7072 if (add) {
7073 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7074 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7075 return -EINVAL;
7076
7077 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7078 if (hooknum != NF_NETDEV_INGRESS)
7079 return -EOPNOTSUPP;
7080
7081 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7082
7083 flowtable_hook->priority = priority;
7084 flowtable_hook->num = hooknum;
7085 } else {
7086 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7087 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7088 if (hooknum != flowtable->hooknum)
7089 return -EOPNOTSUPP;
7090 }
7091
7092 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7093 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7094 if (priority != flowtable->data.priority)
7095 return -EOPNOTSUPP;
7096 }
7097
7098 flowtable_hook->priority = flowtable->data.priority;
7099 flowtable_hook->num = flowtable->hooknum;
7100 }
7101
7102 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7103 err = nf_tables_parse_netdev_hooks(ctx->net,
7104 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7105 &flowtable_hook->list);
7106 if (err < 0)
7107 return err;
7108 }
7109
7110 list_for_each_entry(hook, &flowtable_hook->list, list) {
7111 hook->ops.pf = NFPROTO_NETDEV;
7112 hook->ops.hooknum = flowtable_hook->num;
7113 hook->ops.priority = flowtable_hook->priority;
7114 hook->ops.priv = &flowtable->data;
7115 hook->ops.hook = flowtable->data.type->hook;
7116 }
7117
7118 return err;
7119}
7120
7121static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7122{
7123 const struct nf_flowtable_type *type;
7124
7125 list_for_each_entry(type, &nf_tables_flowtables, list) {
7126 if (family == type->family)
7127 return type;
7128 }
7129 return NULL;
7130}
7131
7132static const struct nf_flowtable_type *
7133nft_flowtable_type_get(struct net *net, u8 family)
7134{
7135 const struct nf_flowtable_type *type;
7136
7137 type = __nft_flowtable_type_get(family);
7138 if (type != NULL && try_module_get(type->owner))
7139 return type;
7140
7141 lockdep_nfnl_nft_mutex_not_held();
7142#ifdef CONFIG_MODULES
7143 if (type == NULL) {
7144 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7145 return ERR_PTR(-EAGAIN);
7146 }
7147#endif
7148 return ERR_PTR(-ENOENT);
7149}
7150
7151
7152static void nft_unregister_flowtable_hook(struct net *net,
7153 struct nft_flowtable *flowtable,
7154 struct nft_hook *hook)
7155{
7156 nf_unregister_net_hook(net, &hook->ops);
7157 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7158 FLOW_BLOCK_UNBIND);
7159}
7160
7161static void nft_unregister_flowtable_net_hooks(struct net *net,
7162 struct list_head *hook_list)
7163{
7164 struct nft_hook *hook;
7165
7166 list_for_each_entry(hook, hook_list, list)
7167 nf_unregister_net_hook(net, &hook->ops);
7168}
7169
7170static int nft_register_flowtable_net_hooks(struct net *net,
7171 struct nft_table *table,
7172 struct list_head *hook_list,
7173 struct nft_flowtable *flowtable)
7174{
7175 struct nft_hook *hook, *hook2, *next;
7176 struct nft_flowtable *ft;
7177 int err, i = 0;
7178
7179 list_for_each_entry(hook, hook_list, list) {
7180 list_for_each_entry(ft, &table->flowtables, list) {
7181 if (!nft_is_active_next(net, ft))
7182 continue;
7183
7184 list_for_each_entry(hook2, &ft->hook_list, list) {
7185 if (hook->ops.dev == hook2->ops.dev &&
7186 hook->ops.pf == hook2->ops.pf) {
7187 err = -EEXIST;
7188 goto err_unregister_net_hooks;
7189 }
7190 }
7191 }
7192
7193 err = flowtable->data.type->setup(&flowtable->data,
7194 hook->ops.dev,
7195 FLOW_BLOCK_BIND);
7196 if (err < 0)
7197 goto err_unregister_net_hooks;
7198
7199 err = nf_register_net_hook(net, &hook->ops);
7200 if (err < 0) {
7201 flowtable->data.type->setup(&flowtable->data,
7202 hook->ops.dev,
7203 FLOW_BLOCK_UNBIND);
7204 goto err_unregister_net_hooks;
7205 }
7206
7207 i++;
7208 }
7209
7210 return 0;
7211
7212err_unregister_net_hooks:
7213 list_for_each_entry_safe(hook, next, hook_list, list) {
7214 if (i-- <= 0)
7215 break;
7216
7217 nft_unregister_flowtable_hook(net, flowtable, hook);
7218 list_del_rcu(&hook->list);
7219 kfree_rcu(hook, rcu);
7220 }
7221
7222 return err;
7223}
7224
7225static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7226{
7227 struct nft_hook *hook, *next;
7228
7229 list_for_each_entry_safe(hook, next, hook_list, list) {
7230 list_del_rcu(&hook->list);
7231 kfree_rcu(hook, rcu);
7232 }
7233}
7234
7235static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7236 struct nft_flowtable *flowtable)
7237{
7238 const struct nlattr * const *nla = ctx->nla;
7239 struct nft_flowtable_hook flowtable_hook;
7240 struct nft_hook *hook, *next;
7241 struct nft_trans *trans;
7242 bool unregister = false;
7243 u32 flags;
7244 int err;
7245
7246 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7247 &flowtable_hook, flowtable, false);
7248 if (err < 0)
7249 return err;
7250
7251 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7252 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7253 list_del(&hook->list);
7254 kfree(hook);
7255 }
7256 }
7257
7258 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7259 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7260 if (flags & ~NFT_FLOWTABLE_MASK)
7261 return -EOPNOTSUPP;
7262 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7263 (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7264 return -EOPNOTSUPP;
7265 } else {
7266 flags = flowtable->data.flags;
7267 }
7268
7269 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7270 &flowtable_hook.list, flowtable);
7271 if (err < 0)
7272 goto err_flowtable_update_hook;
7273
7274 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7275 sizeof(struct nft_trans_flowtable));
7276 if (!trans) {
7277 unregister = true;
7278 err = -ENOMEM;
7279 goto err_flowtable_update_hook;
7280 }
7281
7282 nft_trans_flowtable_flags(trans) = flags;
7283 nft_trans_flowtable(trans) = flowtable;
7284 nft_trans_flowtable_update(trans) = true;
7285 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7286 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7287
7288 nft_trans_commit_list_add_tail(ctx->net, trans);
7289
7290 return 0;
7291
7292err_flowtable_update_hook:
7293 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7294 if (unregister)
7295 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7296 list_del_rcu(&hook->list);
7297 kfree_rcu(hook, rcu);
7298 }
7299
7300 return err;
7301
7302}
7303
7304static int nf_tables_newflowtable(struct sk_buff *skb,
7305 const struct nfnl_info *info,
7306 const struct nlattr * const nla[])
7307{
7308 struct netlink_ext_ack *extack = info->extack;
7309 struct nft_flowtable_hook flowtable_hook;
7310 u8 genmask = nft_genmask_next(info->net);
7311 u8 family = info->nfmsg->nfgen_family;
7312 const struct nf_flowtable_type *type;
7313 struct nft_flowtable *flowtable;
7314 struct nft_hook *hook, *next;
7315 struct net *net = info->net;
7316 struct nft_table *table;
7317 struct nft_ctx ctx;
7318 int err;
7319
7320 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7321 !nla[NFTA_FLOWTABLE_NAME] ||
7322 !nla[NFTA_FLOWTABLE_HOOK])
7323 return -EINVAL;
7324
7325 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7326 genmask, NETLINK_CB(skb).portid);
7327 if (IS_ERR(table)) {
7328 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7329 return PTR_ERR(table);
7330 }
7331
7332 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7333 genmask);
7334 if (IS_ERR(flowtable)) {
7335 err = PTR_ERR(flowtable);
7336 if (err != -ENOENT) {
7337 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7338 return err;
7339 }
7340 } else {
7341 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7342 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7343 return -EEXIST;
7344 }
7345
7346 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7347
7348 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7349 }
7350
7351 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7352
7353 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7354 if (!flowtable)
7355 return -ENOMEM;
7356
7357 flowtable->table = table;
7358 flowtable->handle = nf_tables_alloc_handle(table);
7359 INIT_LIST_HEAD(&flowtable->hook_list);
7360
7361 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7362 if (!flowtable->name) {
7363 err = -ENOMEM;
7364 goto err1;
7365 }
7366
7367 type = nft_flowtable_type_get(net, family);
7368 if (IS_ERR(type)) {
7369 err = PTR_ERR(type);
7370 goto err2;
7371 }
7372
7373 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7374 flowtable->data.flags =
7375 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7376 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7377 err = -EOPNOTSUPP;
7378 goto err3;
7379 }
7380 }
7381
7382 write_pnet(&flowtable->data.net, net);
7383 flowtable->data.type = type;
7384 err = type->init(&flowtable->data);
7385 if (err < 0)
7386 goto err3;
7387
7388 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7389 &flowtable_hook, flowtable, true);
7390 if (err < 0)
7391 goto err4;
7392
7393 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7394 flowtable->data.priority = flowtable_hook.priority;
7395 flowtable->hooknum = flowtable_hook.num;
7396
7397 err = nft_register_flowtable_net_hooks(ctx.net, table,
7398 &flowtable->hook_list,
7399 flowtable);
7400 if (err < 0) {
7401 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7402 goto err4;
7403 }
7404
7405 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7406 if (err < 0)
7407 goto err5;
7408
7409 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7410 table->use++;
7411
7412 return 0;
7413err5:
7414 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7415 nft_unregister_flowtable_hook(net, flowtable, hook);
7416 list_del_rcu(&hook->list);
7417 kfree_rcu(hook, rcu);
7418 }
7419err4:
7420 flowtable->data.type->free(&flowtable->data);
7421err3:
7422 module_put(type->owner);
7423err2:
7424 kfree(flowtable->name);
7425err1:
7426 kfree(flowtable);
7427 return err;
7428}
7429
7430static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7431{
7432 struct nft_hook *this, *next;
7433
7434 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7435 list_del(&this->list);
7436 kfree(this);
7437 }
7438}
7439
7440static int nft_delflowtable_hook(struct nft_ctx *ctx,
7441 struct nft_flowtable *flowtable)
7442{
7443 const struct nlattr * const *nla = ctx->nla;
7444 struct nft_flowtable_hook flowtable_hook;
7445 struct nft_hook *this, *hook;
7446 struct nft_trans *trans;
7447 int err;
7448
7449 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7450 &flowtable_hook, flowtable, false);
7451 if (err < 0)
7452 return err;
7453
7454 list_for_each_entry(this, &flowtable_hook.list, list) {
7455 hook = nft_hook_list_find(&flowtable->hook_list, this);
7456 if (!hook) {
7457 err = -ENOENT;
7458 goto err_flowtable_del_hook;
7459 }
7460 hook->inactive = true;
7461 }
7462
7463 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7464 sizeof(struct nft_trans_flowtable));
7465 if (!trans) {
7466 err = -ENOMEM;
7467 goto err_flowtable_del_hook;
7468 }
7469
7470 nft_trans_flowtable(trans) = flowtable;
7471 nft_trans_flowtable_update(trans) = true;
7472 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7473 nft_flowtable_hook_release(&flowtable_hook);
7474
7475 nft_trans_commit_list_add_tail(ctx->net, trans);
7476
7477 return 0;
7478
7479err_flowtable_del_hook:
7480 list_for_each_entry(this, &flowtable_hook.list, list) {
7481 hook = nft_hook_list_find(&flowtable->hook_list, this);
7482 if (!hook)
7483 break;
7484
7485 hook->inactive = false;
7486 }
7487 nft_flowtable_hook_release(&flowtable_hook);
7488
7489 return err;
7490}
7491
7492static int nf_tables_delflowtable(struct sk_buff *skb,
7493 const struct nfnl_info *info,
7494 const struct nlattr * const nla[])
7495{
7496 struct netlink_ext_ack *extack = info->extack;
7497 u8 genmask = nft_genmask_next(info->net);
7498 u8 family = info->nfmsg->nfgen_family;
7499 struct nft_flowtable *flowtable;
7500 struct net *net = info->net;
7501 const struct nlattr *attr;
7502 struct nft_table *table;
7503 struct nft_ctx ctx;
7504
7505 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7506 (!nla[NFTA_FLOWTABLE_NAME] &&
7507 !nla[NFTA_FLOWTABLE_HANDLE]))
7508 return -EINVAL;
7509
7510 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7511 genmask, NETLINK_CB(skb).portid);
7512 if (IS_ERR(table)) {
7513 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7514 return PTR_ERR(table);
7515 }
7516
7517 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7518 attr = nla[NFTA_FLOWTABLE_HANDLE];
7519 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7520 } else {
7521 attr = nla[NFTA_FLOWTABLE_NAME];
7522 flowtable = nft_flowtable_lookup(table, attr, genmask);
7523 }
7524
7525 if (IS_ERR(flowtable)) {
7526 NL_SET_BAD_ATTR(extack, attr);
7527 return PTR_ERR(flowtable);
7528 }
7529
7530 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7531
7532 if (nla[NFTA_FLOWTABLE_HOOK])
7533 return nft_delflowtable_hook(&ctx, flowtable);
7534
7535 if (flowtable->use > 0) {
7536 NL_SET_BAD_ATTR(extack, attr);
7537 return -EBUSY;
7538 }
7539
7540 return nft_delflowtable(&ctx, flowtable);
7541}
7542
7543static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7544 u32 portid, u32 seq, int event,
7545 u32 flags, int family,
7546 struct nft_flowtable *flowtable,
7547 struct list_head *hook_list)
7548{
7549 struct nlattr *nest, *nest_devs;
7550 struct nft_hook *hook;
7551 struct nlmsghdr *nlh;
7552
7553 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7554 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7555 NFNETLINK_V0, nft_base_seq(net));
7556 if (!nlh)
7557 goto nla_put_failure;
7558
7559 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7560 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7561 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7562 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7563 NFTA_FLOWTABLE_PAD) ||
7564 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7565 goto nla_put_failure;
7566
7567 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7568 if (!nest)
7569 goto nla_put_failure;
7570 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7571 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7572 goto nla_put_failure;
7573
7574 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7575 if (!nest_devs)
7576 goto nla_put_failure;
7577
7578 list_for_each_entry_rcu(hook, hook_list, list) {
7579 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7580 goto nla_put_failure;
7581 }
7582 nla_nest_end(skb, nest_devs);
7583 nla_nest_end(skb, nest);
7584
7585 nlmsg_end(skb, nlh);
7586 return 0;
7587
7588nla_put_failure:
7589 nlmsg_trim(skb, nlh);
7590 return -1;
7591}
7592
7593struct nft_flowtable_filter {
7594 char *table;
7595};
7596
7597static int nf_tables_dump_flowtable(struct sk_buff *skb,
7598 struct netlink_callback *cb)
7599{
7600 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7601 struct nft_flowtable_filter *filter = cb->data;
7602 unsigned int idx = 0, s_idx = cb->args[0];
7603 struct net *net = sock_net(skb->sk);
7604 int family = nfmsg->nfgen_family;
7605 struct nft_flowtable *flowtable;
7606 struct nftables_pernet *nft_net;
7607 const struct nft_table *table;
7608
7609 rcu_read_lock();
7610 nft_net = nft_pernet(net);
7611 cb->seq = nft_net->base_seq;
7612
7613 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7614 if (family != NFPROTO_UNSPEC && family != table->family)
7615 continue;
7616
7617 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7618 if (!nft_is_active(net, flowtable))
7619 goto cont;
7620 if (idx < s_idx)
7621 goto cont;
7622 if (idx > s_idx)
7623 memset(&cb->args[1], 0,
7624 sizeof(cb->args) - sizeof(cb->args[0]));
7625 if (filter && filter->table &&
7626 strcmp(filter->table, table->name))
7627 goto cont;
7628
7629 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7630 cb->nlh->nlmsg_seq,
7631 NFT_MSG_NEWFLOWTABLE,
7632 NLM_F_MULTI | NLM_F_APPEND,
7633 table->family,
7634 flowtable,
7635 &flowtable->hook_list) < 0)
7636 goto done;
7637
7638 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7639cont:
7640 idx++;
7641 }
7642 }
7643done:
7644 rcu_read_unlock();
7645
7646 cb->args[0] = idx;
7647 return skb->len;
7648}
7649
7650static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7651{
7652 const struct nlattr * const *nla = cb->data;
7653 struct nft_flowtable_filter *filter = NULL;
7654
7655 if (nla[NFTA_FLOWTABLE_TABLE]) {
7656 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7657 if (!filter)
7658 return -ENOMEM;
7659
7660 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7661 GFP_ATOMIC);
7662 if (!filter->table) {
7663 kfree(filter);
7664 return -ENOMEM;
7665 }
7666 }
7667
7668 cb->data = filter;
7669 return 0;
7670}
7671
7672static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7673{
7674 struct nft_flowtable_filter *filter = cb->data;
7675
7676 if (!filter)
7677 return 0;
7678
7679 kfree(filter->table);
7680 kfree(filter);
7681
7682 return 0;
7683}
7684
7685
7686static int nf_tables_getflowtable(struct sk_buff *skb,
7687 const struct nfnl_info *info,
7688 const struct nlattr * const nla[])
7689{
7690 u8 genmask = nft_genmask_cur(info->net);
7691 u8 family = info->nfmsg->nfgen_family;
7692 struct nft_flowtable *flowtable;
7693 const struct nft_table *table;
7694 struct net *net = info->net;
7695 struct sk_buff *skb2;
7696 int err;
7697
7698 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7699 struct netlink_dump_control c = {
7700 .start = nf_tables_dump_flowtable_start,
7701 .dump = nf_tables_dump_flowtable,
7702 .done = nf_tables_dump_flowtable_done,
7703 .module = THIS_MODULE,
7704 .data = (void *)nla,
7705 };
7706
7707 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7708 }
7709
7710 if (!nla[NFTA_FLOWTABLE_NAME])
7711 return -EINVAL;
7712
7713 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7714 genmask, 0);
7715 if (IS_ERR(table))
7716 return PTR_ERR(table);
7717
7718 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7719 genmask);
7720 if (IS_ERR(flowtable))
7721 return PTR_ERR(flowtable);
7722
7723 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7724 if (!skb2)
7725 return -ENOMEM;
7726
7727 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7728 info->nlh->nlmsg_seq,
7729 NFT_MSG_NEWFLOWTABLE, 0, family,
7730 flowtable, &flowtable->hook_list);
7731 if (err < 0)
7732 goto err_fill_flowtable_info;
7733
7734 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7735
7736err_fill_flowtable_info:
7737 kfree_skb(skb2);
7738 return err;
7739}
7740
7741static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7742 struct nft_flowtable *flowtable,
7743 struct list_head *hook_list,
7744 int event)
7745{
7746 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7747 struct sk_buff *skb;
7748 int err;
7749
7750 if (!ctx->report &&
7751 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7752 return;
7753
7754 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7755 if (skb == NULL)
7756 goto err;
7757
7758 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7759 ctx->seq, event, 0,
7760 ctx->family, flowtable, hook_list);
7761 if (err < 0) {
7762 kfree_skb(skb);
7763 goto err;
7764 }
7765
7766 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7767 return;
7768err:
7769 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7770}
7771
7772static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7773{
7774 struct nft_hook *hook, *next;
7775
7776 flowtable->data.type->free(&flowtable->data);
7777 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7778 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7779 FLOW_BLOCK_UNBIND);
7780 list_del_rcu(&hook->list);
7781 kfree(hook);
7782 }
7783 kfree(flowtable->name);
7784 module_put(flowtable->data.type->owner);
7785 kfree(flowtable);
7786}
7787
7788static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7789 u32 portid, u32 seq)
7790{
7791 struct nftables_pernet *nft_net = nft_pernet(net);
7792 struct nlmsghdr *nlh;
7793 char buf[TASK_COMM_LEN];
7794 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7795
7796 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7797 NFNETLINK_V0, nft_base_seq(net));
7798 if (!nlh)
7799 goto nla_put_failure;
7800
7801 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7802 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7803 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7804 goto nla_put_failure;
7805
7806 nlmsg_end(skb, nlh);
7807 return 0;
7808
7809nla_put_failure:
7810 nlmsg_trim(skb, nlh);
7811 return -EMSGSIZE;
7812}
7813
7814static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7815 struct nft_flowtable *flowtable)
7816{
7817 struct nft_hook *hook;
7818
7819 list_for_each_entry(hook, &flowtable->hook_list, list) {
7820 if (hook->ops.dev != dev)
7821 continue;
7822
7823
7824 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7825 list_del_rcu(&hook->list);
7826 kfree_rcu(hook, rcu);
7827 break;
7828 }
7829}
7830
7831static int nf_tables_flowtable_event(struct notifier_block *this,
7832 unsigned long event, void *ptr)
7833{
7834 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7835 struct nft_flowtable *flowtable;
7836 struct nftables_pernet *nft_net;
7837 struct nft_table *table;
7838 struct net *net;
7839
7840 if (event != NETDEV_UNREGISTER)
7841 return 0;
7842
7843 net = dev_net(dev);
7844 nft_net = nft_pernet(net);
7845 mutex_lock(&nft_net->commit_mutex);
7846 list_for_each_entry(table, &nft_net->tables, list) {
7847 list_for_each_entry(flowtable, &table->flowtables, list) {
7848 nft_flowtable_event(event, dev, flowtable);
7849 }
7850 }
7851 mutex_unlock(&nft_net->commit_mutex);
7852
7853 return NOTIFY_DONE;
7854}
7855
7856static struct notifier_block nf_tables_flowtable_notifier = {
7857 .notifier_call = nf_tables_flowtable_event,
7858};
7859
7860static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7861 int event)
7862{
7863 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7864 struct sk_buff *skb2;
7865 int err;
7866
7867 if (!nlmsg_report(nlh) &&
7868 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7869 return;
7870
7871 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7872 if (skb2 == NULL)
7873 goto err;
7874
7875 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7876 nlh->nlmsg_seq);
7877 if (err < 0) {
7878 kfree_skb(skb2);
7879 goto err;
7880 }
7881
7882 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7883 nlmsg_report(nlh), GFP_KERNEL);
7884 return;
7885err:
7886 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7887 -ENOBUFS);
7888}
7889
7890static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7891 const struct nlattr * const nla[])
7892{
7893 struct sk_buff *skb2;
7894 int err;
7895
7896 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7897 if (skb2 == NULL)
7898 return -ENOMEM;
7899
7900 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7901 info->nlh->nlmsg_seq);
7902 if (err < 0)
7903 goto err_fill_gen_info;
7904
7905 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
7906
7907err_fill_gen_info:
7908 kfree_skb(skb2);
7909 return err;
7910}
7911
7912static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7913 [NFT_MSG_NEWTABLE] = {
7914 .call = nf_tables_newtable,
7915 .type = NFNL_CB_BATCH,
7916 .attr_count = NFTA_TABLE_MAX,
7917 .policy = nft_table_policy,
7918 },
7919 [NFT_MSG_GETTABLE] = {
7920 .call = nf_tables_gettable,
7921 .type = NFNL_CB_RCU,
7922 .attr_count = NFTA_TABLE_MAX,
7923 .policy = nft_table_policy,
7924 },
7925 [NFT_MSG_DELTABLE] = {
7926 .call = nf_tables_deltable,
7927 .type = NFNL_CB_BATCH,
7928 .attr_count = NFTA_TABLE_MAX,
7929 .policy = nft_table_policy,
7930 },
7931 [NFT_MSG_NEWCHAIN] = {
7932 .call = nf_tables_newchain,
7933 .type = NFNL_CB_BATCH,
7934 .attr_count = NFTA_CHAIN_MAX,
7935 .policy = nft_chain_policy,
7936 },
7937 [NFT_MSG_GETCHAIN] = {
7938 .call = nf_tables_getchain,
7939 .type = NFNL_CB_RCU,
7940 .attr_count = NFTA_CHAIN_MAX,
7941 .policy = nft_chain_policy,
7942 },
7943 [NFT_MSG_DELCHAIN] = {
7944 .call = nf_tables_delchain,
7945 .type = NFNL_CB_BATCH,
7946 .attr_count = NFTA_CHAIN_MAX,
7947 .policy = nft_chain_policy,
7948 },
7949 [NFT_MSG_NEWRULE] = {
7950 .call = nf_tables_newrule,
7951 .type = NFNL_CB_BATCH,
7952 .attr_count = NFTA_RULE_MAX,
7953 .policy = nft_rule_policy,
7954 },
7955 [NFT_MSG_GETRULE] = {
7956 .call = nf_tables_getrule,
7957 .type = NFNL_CB_RCU,
7958 .attr_count = NFTA_RULE_MAX,
7959 .policy = nft_rule_policy,
7960 },
7961 [NFT_MSG_DELRULE] = {
7962 .call = nf_tables_delrule,
7963 .type = NFNL_CB_BATCH,
7964 .attr_count = NFTA_RULE_MAX,
7965 .policy = nft_rule_policy,
7966 },
7967 [NFT_MSG_NEWSET] = {
7968 .call = nf_tables_newset,
7969 .type = NFNL_CB_BATCH,
7970 .attr_count = NFTA_SET_MAX,
7971 .policy = nft_set_policy,
7972 },
7973 [NFT_MSG_GETSET] = {
7974 .call = nf_tables_getset,
7975 .type = NFNL_CB_RCU,
7976 .attr_count = NFTA_SET_MAX,
7977 .policy = nft_set_policy,
7978 },
7979 [NFT_MSG_DELSET] = {
7980 .call = nf_tables_delset,
7981 .type = NFNL_CB_BATCH,
7982 .attr_count = NFTA_SET_MAX,
7983 .policy = nft_set_policy,
7984 },
7985 [NFT_MSG_NEWSETELEM] = {
7986 .call = nf_tables_newsetelem,
7987 .type = NFNL_CB_BATCH,
7988 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7989 .policy = nft_set_elem_list_policy,
7990 },
7991 [NFT_MSG_GETSETELEM] = {
7992 .call = nf_tables_getsetelem,
7993 .type = NFNL_CB_RCU,
7994 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7995 .policy = nft_set_elem_list_policy,
7996 },
7997 [NFT_MSG_DELSETELEM] = {
7998 .call = nf_tables_delsetelem,
7999 .type = NFNL_CB_BATCH,
8000 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8001 .policy = nft_set_elem_list_policy,
8002 },
8003 [NFT_MSG_GETGEN] = {
8004 .call = nf_tables_getgen,
8005 .type = NFNL_CB_RCU,
8006 },
8007 [NFT_MSG_NEWOBJ] = {
8008 .call = nf_tables_newobj,
8009 .type = NFNL_CB_BATCH,
8010 .attr_count = NFTA_OBJ_MAX,
8011 .policy = nft_obj_policy,
8012 },
8013 [NFT_MSG_GETOBJ] = {
8014 .call = nf_tables_getobj,
8015 .type = NFNL_CB_RCU,
8016 .attr_count = NFTA_OBJ_MAX,
8017 .policy = nft_obj_policy,
8018 },
8019 [NFT_MSG_DELOBJ] = {
8020 .call = nf_tables_delobj,
8021 .type = NFNL_CB_BATCH,
8022 .attr_count = NFTA_OBJ_MAX,
8023 .policy = nft_obj_policy,
8024 },
8025 [NFT_MSG_GETOBJ_RESET] = {
8026 .call = nf_tables_getobj,
8027 .type = NFNL_CB_RCU,
8028 .attr_count = NFTA_OBJ_MAX,
8029 .policy = nft_obj_policy,
8030 },
8031 [NFT_MSG_NEWFLOWTABLE] = {
8032 .call = nf_tables_newflowtable,
8033 .type = NFNL_CB_BATCH,
8034 .attr_count = NFTA_FLOWTABLE_MAX,
8035 .policy = nft_flowtable_policy,
8036 },
8037 [NFT_MSG_GETFLOWTABLE] = {
8038 .call = nf_tables_getflowtable,
8039 .type = NFNL_CB_RCU,
8040 .attr_count = NFTA_FLOWTABLE_MAX,
8041 .policy = nft_flowtable_policy,
8042 },
8043 [NFT_MSG_DELFLOWTABLE] = {
8044 .call = nf_tables_delflowtable,
8045 .type = NFNL_CB_BATCH,
8046 .attr_count = NFTA_FLOWTABLE_MAX,
8047 .policy = nft_flowtable_policy,
8048 },
8049};
8050
8051static int nf_tables_validate(struct net *net)
8052{
8053 struct nftables_pernet *nft_net = nft_pernet(net);
8054 struct nft_table *table;
8055
8056 switch (nft_net->validate_state) {
8057 case NFT_VALIDATE_SKIP:
8058 break;
8059 case NFT_VALIDATE_NEED:
8060 nft_validate_state_update(net, NFT_VALIDATE_DO);
8061 fallthrough;
8062 case NFT_VALIDATE_DO:
8063 list_for_each_entry(table, &nft_net->tables, list) {
8064 if (nft_table_validate(net, table) < 0)
8065 return -EAGAIN;
8066 }
8067 break;
8068 }
8069
8070 return 0;
8071}
8072
8073
8074
8075
8076
8077
8078
8079
8080static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8081{
8082 struct nft_base_chain *basechain;
8083
8084 if (nft_trans_chain_policy(trans) != NF_DROP)
8085 return;
8086
8087 if (!nft_is_base_chain(trans->ctx.chain))
8088 return;
8089
8090 basechain = nft_base_chain(trans->ctx.chain);
8091 basechain->policy = NF_DROP;
8092}
8093
8094static void nft_chain_commit_update(struct nft_trans *trans)
8095{
8096 struct nft_base_chain *basechain;
8097
8098 if (nft_trans_chain_name(trans)) {
8099 rhltable_remove(&trans->ctx.table->chains_ht,
8100 &trans->ctx.chain->rhlhead,
8101 nft_chain_ht_params);
8102 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8103 rhltable_insert_key(&trans->ctx.table->chains_ht,
8104 trans->ctx.chain->name,
8105 &trans->ctx.chain->rhlhead,
8106 nft_chain_ht_params);
8107 }
8108
8109 if (!nft_is_base_chain(trans->ctx.chain))
8110 return;
8111
8112 nft_chain_stats_replace(trans);
8113
8114 basechain = nft_base_chain(trans->ctx.chain);
8115
8116 switch (nft_trans_chain_policy(trans)) {
8117 case NF_DROP:
8118 case NF_ACCEPT:
8119 basechain->policy = nft_trans_chain_policy(trans);
8120 break;
8121 }
8122}
8123
8124static void nft_obj_commit_update(struct nft_trans *trans)
8125{
8126 struct nft_object *newobj;
8127 struct nft_object *obj;
8128
8129 obj = nft_trans_obj(trans);
8130 newobj = nft_trans_obj_newobj(trans);
8131
8132 if (obj->ops->update)
8133 obj->ops->update(obj, newobj);
8134
8135 kfree(newobj);
8136}
8137
8138static void nft_commit_release(struct nft_trans *trans)
8139{
8140 switch (trans->msg_type) {
8141 case NFT_MSG_DELTABLE:
8142 nf_tables_table_destroy(&trans->ctx);
8143 break;
8144 case NFT_MSG_NEWCHAIN:
8145 free_percpu(nft_trans_chain_stats(trans));
8146 kfree(nft_trans_chain_name(trans));
8147 break;
8148 case NFT_MSG_DELCHAIN:
8149 nf_tables_chain_destroy(&trans->ctx);
8150 break;
8151 case NFT_MSG_DELRULE:
8152 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8153 break;
8154 case NFT_MSG_DELSET:
8155 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8156 break;
8157 case NFT_MSG_DELSETELEM:
8158 nf_tables_set_elem_destroy(&trans->ctx,
8159 nft_trans_elem_set(trans),
8160 nft_trans_elem(trans).priv);
8161 break;
8162 case NFT_MSG_DELOBJ:
8163 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8164 break;
8165 case NFT_MSG_DELFLOWTABLE:
8166 if (nft_trans_flowtable_update(trans))
8167 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8168 else
8169 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8170 break;
8171 }
8172
8173 if (trans->put_net)
8174 put_net(trans->ctx.net);
8175
8176 kfree(trans);
8177}
8178
8179static void nf_tables_trans_destroy_work(struct work_struct *w)
8180{
8181 struct nft_trans *trans, *next;
8182 LIST_HEAD(head);
8183
8184 spin_lock(&nf_tables_destroy_list_lock);
8185 list_splice_init(&nf_tables_destroy_list, &head);
8186 spin_unlock(&nf_tables_destroy_list_lock);
8187
8188 if (list_empty(&head))
8189 return;
8190
8191 synchronize_rcu();
8192
8193 list_for_each_entry_safe(trans, next, &head, list) {
8194 list_del(&trans->list);
8195 nft_commit_release(trans);
8196 }
8197}
8198
8199void nf_tables_trans_destroy_flush_work(void)
8200{
8201 flush_work(&trans_destroy_work);
8202}
8203EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8204
8205static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8206{
8207 struct nft_rule *rule;
8208 unsigned int alloc = 0;
8209 int i;
8210
8211
8212 if (chain->rules_next || !nft_is_active_next(net, chain))
8213 return 0;
8214
8215 rule = list_entry(&chain->rules, struct nft_rule, list);
8216 i = 0;
8217
8218 list_for_each_entry_continue(rule, &chain->rules, list) {
8219 if (nft_is_active_next(net, rule))
8220 alloc++;
8221 }
8222
8223 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8224 if (!chain->rules_next)
8225 return -ENOMEM;
8226
8227 list_for_each_entry_continue(rule, &chain->rules, list) {
8228 if (nft_is_active_next(net, rule))
8229 chain->rules_next[i++] = rule;
8230 }
8231
8232 chain->rules_next[i] = NULL;
8233 return 0;
8234}
8235
8236static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8237{
8238 struct nftables_pernet *nft_net = nft_pernet(net);
8239 struct nft_trans *trans, *next;
8240
8241 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8242 struct nft_chain *chain = trans->ctx.chain;
8243
8244 if (trans->msg_type == NFT_MSG_NEWRULE ||
8245 trans->msg_type == NFT_MSG_DELRULE) {
8246 kvfree(chain->rules_next);
8247 chain->rules_next = NULL;
8248 }
8249 }
8250}
8251
8252static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8253{
8254 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8255
8256 kvfree(o->start);
8257}
8258
8259static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8260{
8261 struct nft_rule **r = rules;
8262 struct nft_rules_old *old;
8263
8264 while (*r)
8265 r++;
8266
8267 r++;
8268 old = (void *) r;
8269 old->start = rules;
8270
8271 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8272}
8273
8274static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8275{
8276 struct nft_rule **g0, **g1;
8277 bool next_genbit;
8278
8279 next_genbit = nft_gencursor_next(net);
8280
8281 g0 = rcu_dereference_protected(chain->rules_gen_0,
8282 lockdep_commit_lock_is_held(net));
8283 g1 = rcu_dereference_protected(chain->rules_gen_1,
8284 lockdep_commit_lock_is_held(net));
8285
8286
8287 if (chain->rules_next == NULL) {
8288
8289 if (g0 == g1)
8290 return;
8291
8292
8293
8294
8295 if (next_genbit) {
8296 rcu_assign_pointer(chain->rules_gen_1, g0);
8297 nf_tables_commit_chain_free_rules_old(g1);
8298 } else {
8299 rcu_assign_pointer(chain->rules_gen_0, g1);
8300 nf_tables_commit_chain_free_rules_old(g0);
8301 }
8302
8303 return;
8304 }
8305
8306 if (next_genbit)
8307 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8308 else
8309 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8310
8311 chain->rules_next = NULL;
8312
8313 if (g0 == g1)
8314 return;
8315
8316 if (next_genbit)
8317 nf_tables_commit_chain_free_rules_old(g1);
8318 else
8319 nf_tables_commit_chain_free_rules_old(g0);
8320}
8321
8322static void nft_obj_del(struct nft_object *obj)
8323{
8324 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8325 list_del_rcu(&obj->list);
8326}
8327
8328void nft_chain_del(struct nft_chain *chain)
8329{
8330 struct nft_table *table = chain->table;
8331
8332 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8333 nft_chain_ht_params));
8334 list_del_rcu(&chain->list);
8335}
8336
8337static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8338 struct list_head *hook_list)
8339{
8340 struct nft_hook *hook, *next;
8341
8342 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8343 if (hook->inactive)
8344 list_move(&hook->list, hook_list);
8345 }
8346}
8347
8348static void nf_tables_module_autoload_cleanup(struct net *net)
8349{
8350 struct nftables_pernet *nft_net = nft_pernet(net);
8351 struct nft_module_request *req, *next;
8352
8353 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8354 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8355 WARN_ON_ONCE(!req->done);
8356 list_del(&req->list);
8357 kfree(req);
8358 }
8359}
8360
8361static void nf_tables_commit_release(struct net *net)
8362{
8363 struct nftables_pernet *nft_net = nft_pernet(net);
8364 struct nft_trans *trans;
8365
8366
8367
8368
8369
8370
8371
8372
8373 if (list_empty(&nft_net->commit_list)) {
8374 nf_tables_module_autoload_cleanup(net);
8375 mutex_unlock(&nft_net->commit_mutex);
8376 return;
8377 }
8378
8379 trans = list_last_entry(&nft_net->commit_list,
8380 struct nft_trans, list);
8381 get_net(trans->ctx.net);
8382 WARN_ON_ONCE(trans->put_net);
8383
8384 trans->put_net = true;
8385 spin_lock(&nf_tables_destroy_list_lock);
8386 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8387 spin_unlock(&nf_tables_destroy_list_lock);
8388
8389 nf_tables_module_autoload_cleanup(net);
8390 schedule_work(&trans_destroy_work);
8391
8392 mutex_unlock(&nft_net->commit_mutex);
8393}
8394
8395static void nft_commit_notify(struct net *net, u32 portid)
8396{
8397 struct nftables_pernet *nft_net = nft_pernet(net);
8398 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8399 unsigned char *data;
8400 int len;
8401
8402 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8403 if (!batch_skb) {
8404new_batch:
8405 batch_skb = skb;
8406 len = NLMSG_GOODSIZE - skb->len;
8407 list_del(&skb->list);
8408 continue;
8409 }
8410 len -= skb->len;
8411 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8412 data = skb_put(batch_skb, skb->len);
8413 memcpy(data, skb->data, skb->len);
8414 list_del(&skb->list);
8415 kfree_skb(skb);
8416 continue;
8417 }
8418 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8419 NFT_CB(batch_skb).report, GFP_KERNEL);
8420 goto new_batch;
8421 }
8422
8423 if (batch_skb) {
8424 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8425 NFT_CB(batch_skb).report, GFP_KERNEL);
8426 }
8427
8428 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8429}
8430
8431static int nf_tables_commit_audit_alloc(struct list_head *adl,
8432 struct nft_table *table)
8433{
8434 struct nft_audit_data *adp;
8435
8436 list_for_each_entry(adp, adl, list) {
8437 if (adp->table == table)
8438 return 0;
8439 }
8440 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8441 if (!adp)
8442 return -ENOMEM;
8443 adp->table = table;
8444 list_add(&adp->list, adl);
8445 return 0;
8446}
8447
8448static void nf_tables_commit_audit_free(struct list_head *adl)
8449{
8450 struct nft_audit_data *adp, *adn;
8451
8452 list_for_each_entry_safe(adp, adn, adl, list) {
8453 list_del(&adp->list);
8454 kfree(adp);
8455 }
8456}
8457
8458static void nf_tables_commit_audit_collect(struct list_head *adl,
8459 struct nft_table *table, u32 op)
8460{
8461 struct nft_audit_data *adp;
8462
8463 list_for_each_entry(adp, adl, list) {
8464 if (adp->table == table)
8465 goto found;
8466 }
8467 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8468 return;
8469found:
8470 adp->entries++;
8471 if (!adp->op || adp->op > op)
8472 adp->op = op;
8473}
8474
8475#define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8476
8477static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8478{
8479 struct nft_audit_data *adp, *adn;
8480 char aubuf[AUNFTABLENAMELEN];
8481
8482 list_for_each_entry_safe(adp, adn, adl, list) {
8483 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8484 generation);
8485 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8486 nft2audit_op[adp->op], GFP_KERNEL);
8487 list_del(&adp->list);
8488 kfree(adp);
8489 }
8490}
8491
8492static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8493{
8494 struct nftables_pernet *nft_net = nft_pernet(net);
8495 struct nft_trans *trans, *next;
8496 struct nft_trans_elem *te;
8497 struct nft_chain *chain;
8498 struct nft_table *table;
8499 LIST_HEAD(adl);
8500 int err;
8501
8502 if (list_empty(&nft_net->commit_list)) {
8503 mutex_unlock(&nft_net->commit_mutex);
8504 return 0;
8505 }
8506
8507
8508 if (nf_tables_validate(net) < 0)
8509 return -EAGAIN;
8510
8511 err = nft_flow_rule_offload_commit(net);
8512 if (err < 0)
8513 return err;
8514
8515
8516 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8517 int ret;
8518
8519 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8520 if (ret) {
8521 nf_tables_commit_chain_prepare_cancel(net);
8522 nf_tables_commit_audit_free(&adl);
8523 return ret;
8524 }
8525 if (trans->msg_type == NFT_MSG_NEWRULE ||
8526 trans->msg_type == NFT_MSG_DELRULE) {
8527 chain = trans->ctx.chain;
8528
8529 ret = nf_tables_commit_chain_prepare(net, chain);
8530 if (ret < 0) {
8531 nf_tables_commit_chain_prepare_cancel(net);
8532 nf_tables_commit_audit_free(&adl);
8533 return ret;
8534 }
8535 }
8536 }
8537
8538
8539 list_for_each_entry(table, &nft_net->tables, list) {
8540 list_for_each_entry(chain, &table->chains, list)
8541 nf_tables_commit_chain(net, chain);
8542 }
8543
8544
8545
8546
8547
8548 while (++nft_net->base_seq == 0)
8549 ;
8550
8551
8552 net->nft.gencursor = nft_gencursor_next(net);
8553
8554 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8555 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8556 trans->msg_type);
8557 switch (trans->msg_type) {
8558 case NFT_MSG_NEWTABLE:
8559 if (nft_trans_table_update(trans)) {
8560 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8561 nft_trans_destroy(trans);
8562 break;
8563 }
8564 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8565 nf_tables_table_disable(net, trans->ctx.table);
8566
8567 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8568 } else {
8569 nft_clear(net, trans->ctx.table);
8570 }
8571 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8572 nft_trans_destroy(trans);
8573 break;
8574 case NFT_MSG_DELTABLE:
8575 list_del_rcu(&trans->ctx.table->list);
8576 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8577 break;
8578 case NFT_MSG_NEWCHAIN:
8579 if (nft_trans_chain_update(trans)) {
8580 nft_chain_commit_update(trans);
8581 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8582
8583 } else {
8584 nft_chain_commit_drop_policy(trans);
8585 nft_clear(net, trans->ctx.chain);
8586 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8587 nft_trans_destroy(trans);
8588 }
8589 break;
8590 case NFT_MSG_DELCHAIN:
8591 nft_chain_del(trans->ctx.chain);
8592 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8593 nf_tables_unregister_hook(trans->ctx.net,
8594 trans->ctx.table,
8595 trans->ctx.chain);
8596 break;
8597 case NFT_MSG_NEWRULE:
8598 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8599 nf_tables_rule_notify(&trans->ctx,
8600 nft_trans_rule(trans),
8601 NFT_MSG_NEWRULE);
8602 nft_trans_destroy(trans);
8603 break;
8604 case NFT_MSG_DELRULE:
8605 list_del_rcu(&nft_trans_rule(trans)->list);
8606 nf_tables_rule_notify(&trans->ctx,
8607 nft_trans_rule(trans),
8608 NFT_MSG_DELRULE);
8609 nft_rule_expr_deactivate(&trans->ctx,
8610 nft_trans_rule(trans),
8611 NFT_TRANS_COMMIT);
8612 break;
8613 case NFT_MSG_NEWSET:
8614 nft_clear(net, nft_trans_set(trans));
8615
8616
8617
8618 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8619 !list_empty(&nft_trans_set(trans)->bindings))
8620 trans->ctx.table->use--;
8621
8622 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8623 NFT_MSG_NEWSET, GFP_KERNEL);
8624 nft_trans_destroy(trans);
8625 break;
8626 case NFT_MSG_DELSET:
8627 list_del_rcu(&nft_trans_set(trans)->list);
8628 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8629 NFT_MSG_DELSET, GFP_KERNEL);
8630 break;
8631 case NFT_MSG_NEWSETELEM:
8632 te = (struct nft_trans_elem *)trans->data;
8633
8634 nft_setelem_activate(net, te->set, &te->elem);
8635 nf_tables_setelem_notify(&trans->ctx, te->set,
8636 &te->elem,
8637 NFT_MSG_NEWSETELEM, 0);
8638 nft_trans_destroy(trans);
8639 break;
8640 case NFT_MSG_DELSETELEM:
8641 te = (struct nft_trans_elem *)trans->data;
8642
8643 nf_tables_setelem_notify(&trans->ctx, te->set,
8644 &te->elem,
8645 NFT_MSG_DELSETELEM, 0);
8646 nft_setelem_remove(net, te->set, &te->elem);
8647 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8648 atomic_dec(&te->set->nelems);
8649 te->set->ndeact--;
8650 }
8651 break;
8652 case NFT_MSG_NEWOBJ:
8653 if (nft_trans_obj_update(trans)) {
8654 nft_obj_commit_update(trans);
8655 nf_tables_obj_notify(&trans->ctx,
8656 nft_trans_obj(trans),
8657 NFT_MSG_NEWOBJ);
8658 } else {
8659 nft_clear(net, nft_trans_obj(trans));
8660 nf_tables_obj_notify(&trans->ctx,
8661 nft_trans_obj(trans),
8662 NFT_MSG_NEWOBJ);
8663 nft_trans_destroy(trans);
8664 }
8665 break;
8666 case NFT_MSG_DELOBJ:
8667 nft_obj_del(nft_trans_obj(trans));
8668 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8669 NFT_MSG_DELOBJ);
8670 break;
8671 case NFT_MSG_NEWFLOWTABLE:
8672 if (nft_trans_flowtable_update(trans)) {
8673 nft_trans_flowtable(trans)->data.flags =
8674 nft_trans_flowtable_flags(trans);
8675 nf_tables_flowtable_notify(&trans->ctx,
8676 nft_trans_flowtable(trans),
8677 &nft_trans_flowtable_hooks(trans),
8678 NFT_MSG_NEWFLOWTABLE);
8679 list_splice(&nft_trans_flowtable_hooks(trans),
8680 &nft_trans_flowtable(trans)->hook_list);
8681 } else {
8682 nft_clear(net, nft_trans_flowtable(trans));
8683 nf_tables_flowtable_notify(&trans->ctx,
8684 nft_trans_flowtable(trans),
8685 &nft_trans_flowtable(trans)->hook_list,
8686 NFT_MSG_NEWFLOWTABLE);
8687 }
8688 nft_trans_destroy(trans);
8689 break;
8690 case NFT_MSG_DELFLOWTABLE:
8691 if (nft_trans_flowtable_update(trans)) {
8692 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8693 &nft_trans_flowtable_hooks(trans));
8694 nf_tables_flowtable_notify(&trans->ctx,
8695 nft_trans_flowtable(trans),
8696 &nft_trans_flowtable_hooks(trans),
8697 NFT_MSG_DELFLOWTABLE);
8698 nft_unregister_flowtable_net_hooks(net,
8699 &nft_trans_flowtable_hooks(trans));
8700 } else {
8701 list_del_rcu(&nft_trans_flowtable(trans)->list);
8702 nf_tables_flowtable_notify(&trans->ctx,
8703 nft_trans_flowtable(trans),
8704 &nft_trans_flowtable(trans)->hook_list,
8705 NFT_MSG_DELFLOWTABLE);
8706 nft_unregister_flowtable_net_hooks(net,
8707 &nft_trans_flowtable(trans)->hook_list);
8708 }
8709 break;
8710 }
8711 }
8712
8713 nft_commit_notify(net, NETLINK_CB(skb).portid);
8714 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8715 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8716 nf_tables_commit_release(net);
8717
8718 return 0;
8719}
8720
8721static void nf_tables_module_autoload(struct net *net)
8722{
8723 struct nftables_pernet *nft_net = nft_pernet(net);
8724 struct nft_module_request *req, *next;
8725 LIST_HEAD(module_list);
8726
8727 list_splice_init(&nft_net->module_list, &module_list);
8728 mutex_unlock(&nft_net->commit_mutex);
8729 list_for_each_entry_safe(req, next, &module_list, list) {
8730 request_module("%s", req->module);
8731 req->done = true;
8732 }
8733 mutex_lock(&nft_net->commit_mutex);
8734 list_splice(&module_list, &nft_net->module_list);
8735}
8736
8737static void nf_tables_abort_release(struct nft_trans *trans)
8738{
8739 switch (trans->msg_type) {
8740 case NFT_MSG_NEWTABLE:
8741 nf_tables_table_destroy(&trans->ctx);
8742 break;
8743 case NFT_MSG_NEWCHAIN:
8744 nf_tables_chain_destroy(&trans->ctx);
8745 break;
8746 case NFT_MSG_NEWRULE:
8747 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8748 break;
8749 case NFT_MSG_NEWSET:
8750 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8751 break;
8752 case NFT_MSG_NEWSETELEM:
8753 nft_set_elem_destroy(nft_trans_elem_set(trans),
8754 nft_trans_elem(trans).priv, true);
8755 break;
8756 case NFT_MSG_NEWOBJ:
8757 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8758 break;
8759 case NFT_MSG_NEWFLOWTABLE:
8760 if (nft_trans_flowtable_update(trans))
8761 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8762 else
8763 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8764 break;
8765 }
8766 kfree(trans);
8767}
8768
8769static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8770{
8771 struct nftables_pernet *nft_net = nft_pernet(net);
8772 struct nft_trans *trans, *next;
8773 struct nft_trans_elem *te;
8774 struct nft_hook *hook;
8775
8776 if (action == NFNL_ABORT_VALIDATE &&
8777 nf_tables_validate(net) < 0)
8778 return -EAGAIN;
8779
8780 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8781 list) {
8782 switch (trans->msg_type) {
8783 case NFT_MSG_NEWTABLE:
8784 if (nft_trans_table_update(trans)) {
8785 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8786 nft_trans_destroy(trans);
8787 break;
8788 }
8789 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8790 nf_tables_table_disable(net, trans->ctx.table);
8791 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8792 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8793 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8794 }
8795 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8796 nft_trans_destroy(trans);
8797 } else {
8798 list_del_rcu(&trans->ctx.table->list);
8799 }
8800 break;
8801 case NFT_MSG_DELTABLE:
8802 nft_clear(trans->ctx.net, trans->ctx.table);
8803 nft_trans_destroy(trans);
8804 break;
8805 case NFT_MSG_NEWCHAIN:
8806 if (nft_trans_chain_update(trans)) {
8807 free_percpu(nft_trans_chain_stats(trans));
8808 kfree(nft_trans_chain_name(trans));
8809 nft_trans_destroy(trans);
8810 } else {
8811 if (nft_chain_is_bound(trans->ctx.chain)) {
8812 nft_trans_destroy(trans);
8813 break;
8814 }
8815 trans->ctx.table->use--;
8816 nft_chain_del(trans->ctx.chain);
8817 nf_tables_unregister_hook(trans->ctx.net,
8818 trans->ctx.table,
8819 trans->ctx.chain);
8820 }
8821 break;
8822 case NFT_MSG_DELCHAIN:
8823 trans->ctx.table->use++;
8824 nft_clear(trans->ctx.net, trans->ctx.chain);
8825 nft_trans_destroy(trans);
8826 break;
8827 case NFT_MSG_NEWRULE:
8828 trans->ctx.chain->use--;
8829 list_del_rcu(&nft_trans_rule(trans)->list);
8830 nft_rule_expr_deactivate(&trans->ctx,
8831 nft_trans_rule(trans),
8832 NFT_TRANS_ABORT);
8833 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8834 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8835 break;
8836 case NFT_MSG_DELRULE:
8837 trans->ctx.chain->use++;
8838 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8839 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8840 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8841 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8842
8843 nft_trans_destroy(trans);
8844 break;
8845 case NFT_MSG_NEWSET:
8846 trans->ctx.table->use--;
8847 if (nft_trans_set_bound(trans)) {
8848 nft_trans_destroy(trans);
8849 break;
8850 }
8851 list_del_rcu(&nft_trans_set(trans)->list);
8852 break;
8853 case NFT_MSG_DELSET:
8854 trans->ctx.table->use++;
8855 nft_clear(trans->ctx.net, nft_trans_set(trans));
8856 nft_trans_destroy(trans);
8857 break;
8858 case NFT_MSG_NEWSETELEM:
8859 if (nft_trans_elem_set_bound(trans)) {
8860 nft_trans_destroy(trans);
8861 break;
8862 }
8863 te = (struct nft_trans_elem *)trans->data;
8864 nft_setelem_remove(net, te->set, &te->elem);
8865 if (!nft_setelem_is_catchall(te->set, &te->elem))
8866 atomic_dec(&te->set->nelems);
8867 break;
8868 case NFT_MSG_DELSETELEM:
8869 te = (struct nft_trans_elem *)trans->data;
8870
8871 nft_setelem_data_activate(net, te->set, &te->elem);
8872 nft_setelem_activate(net, te->set, &te->elem);
8873 if (!nft_setelem_is_catchall(te->set, &te->elem))
8874 te->set->ndeact--;
8875
8876 nft_trans_destroy(trans);
8877 break;
8878 case NFT_MSG_NEWOBJ:
8879 if (nft_trans_obj_update(trans)) {
8880 kfree(nft_trans_obj_newobj(trans));
8881 nft_trans_destroy(trans);
8882 } else {
8883 trans->ctx.table->use--;
8884 nft_obj_del(nft_trans_obj(trans));
8885 }
8886 break;
8887 case NFT_MSG_DELOBJ:
8888 trans->ctx.table->use++;
8889 nft_clear(trans->ctx.net, nft_trans_obj(trans));
8890 nft_trans_destroy(trans);
8891 break;
8892 case NFT_MSG_NEWFLOWTABLE:
8893 if (nft_trans_flowtable_update(trans)) {
8894 nft_unregister_flowtable_net_hooks(net,
8895 &nft_trans_flowtable_hooks(trans));
8896 } else {
8897 trans->ctx.table->use--;
8898 list_del_rcu(&nft_trans_flowtable(trans)->list);
8899 nft_unregister_flowtable_net_hooks(net,
8900 &nft_trans_flowtable(trans)->hook_list);
8901 }
8902 break;
8903 case NFT_MSG_DELFLOWTABLE:
8904 if (nft_trans_flowtable_update(trans)) {
8905 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8906 hook->inactive = false;
8907 } else {
8908 trans->ctx.table->use++;
8909 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8910 }
8911 nft_trans_destroy(trans);
8912 break;
8913 }
8914 }
8915
8916 synchronize_rcu();
8917
8918 list_for_each_entry_safe_reverse(trans, next,
8919 &nft_net->commit_list, list) {
8920 list_del(&trans->list);
8921 nf_tables_abort_release(trans);
8922 }
8923
8924 if (action == NFNL_ABORT_AUTOLOAD)
8925 nf_tables_module_autoload(net);
8926 else
8927 nf_tables_module_autoload_cleanup(net);
8928
8929 return 0;
8930}
8931
8932static void nf_tables_cleanup(struct net *net)
8933{
8934 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8935}
8936
8937static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8938 enum nfnl_abort_action action)
8939{
8940 struct nftables_pernet *nft_net = nft_pernet(net);
8941 int ret = __nf_tables_abort(net, action);
8942
8943 mutex_unlock(&nft_net->commit_mutex);
8944
8945 return ret;
8946}
8947
8948static bool nf_tables_valid_genid(struct net *net, u32 genid)
8949{
8950 struct nftables_pernet *nft_net = nft_pernet(net);
8951 bool genid_ok;
8952
8953 mutex_lock(&nft_net->commit_mutex);
8954
8955 genid_ok = genid == 0 || nft_net->base_seq == genid;
8956 if (!genid_ok)
8957 mutex_unlock(&nft_net->commit_mutex);
8958
8959
8960 return genid_ok;
8961}
8962
8963static const struct nfnetlink_subsystem nf_tables_subsys = {
8964 .name = "nf_tables",
8965 .subsys_id = NFNL_SUBSYS_NFTABLES,
8966 .cb_count = NFT_MSG_MAX,
8967 .cb = nf_tables_cb,
8968 .commit = nf_tables_commit,
8969 .abort = nf_tables_abort,
8970 .cleanup = nf_tables_cleanup,
8971 .valid_genid = nf_tables_valid_genid,
8972 .owner = THIS_MODULE,
8973};
8974
8975int nft_chain_validate_dependency(const struct nft_chain *chain,
8976 enum nft_chain_types type)
8977{
8978 const struct nft_base_chain *basechain;
8979
8980 if (nft_is_base_chain(chain)) {
8981 basechain = nft_base_chain(chain);
8982 if (basechain->type->type != type)
8983 return -EOPNOTSUPP;
8984 }
8985 return 0;
8986}
8987EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8988
8989int nft_chain_validate_hooks(const struct nft_chain *chain,
8990 unsigned int hook_flags)
8991{
8992 struct nft_base_chain *basechain;
8993
8994 if (nft_is_base_chain(chain)) {
8995 basechain = nft_base_chain(chain);
8996
8997 if ((1 << basechain->ops.hooknum) & hook_flags)
8998 return 0;
8999
9000 return -EOPNOTSUPP;
9001 }
9002
9003 return 0;
9004}
9005EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9006
9007
9008
9009
9010
9011
9012
9013
9014
9015
9016static int nf_tables_check_loops(const struct nft_ctx *ctx,
9017 const struct nft_chain *chain);
9018
9019static int nft_check_loops(const struct nft_ctx *ctx,
9020 const struct nft_set_ext *ext)
9021{
9022 const struct nft_data *data;
9023 int ret;
9024
9025 data = nft_set_ext_data(ext);
9026 switch (data->verdict.code) {
9027 case NFT_JUMP:
9028 case NFT_GOTO:
9029 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9030 break;
9031 default:
9032 ret = 0;
9033 break;
9034 }
9035
9036 return ret;
9037}
9038
9039static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9040 struct nft_set *set,
9041 const struct nft_set_iter *iter,
9042 struct nft_set_elem *elem)
9043{
9044 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9045
9046 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9047 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9048 return 0;
9049
9050 return nft_check_loops(ctx, ext);
9051}
9052
9053static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9054 struct nft_set *set)
9055{
9056 u8 genmask = nft_genmask_next(ctx->net);
9057 struct nft_set_elem_catchall *catchall;
9058 struct nft_set_ext *ext;
9059 int ret = 0;
9060
9061 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9062 ext = nft_set_elem_ext(set, catchall->elem);
9063 if (!nft_set_elem_active(ext, genmask))
9064 continue;
9065
9066 ret = nft_check_loops(ctx, ext);
9067 if (ret < 0)
9068 return ret;
9069 }
9070
9071 return ret;
9072}
9073
9074static int nf_tables_check_loops(const struct nft_ctx *ctx,
9075 const struct nft_chain *chain)
9076{
9077 const struct nft_rule *rule;
9078 const struct nft_expr *expr, *last;
9079 struct nft_set *set;
9080 struct nft_set_binding *binding;
9081 struct nft_set_iter iter;
9082
9083 if (ctx->chain == chain)
9084 return -ELOOP;
9085
9086 list_for_each_entry(rule, &chain->rules, list) {
9087 nft_rule_for_each_expr(expr, last, rule) {
9088 struct nft_immediate_expr *priv;
9089 const struct nft_data *data;
9090 int err;
9091
9092 if (strcmp(expr->ops->type->name, "immediate"))
9093 continue;
9094
9095 priv = nft_expr_priv(expr);
9096 if (priv->dreg != NFT_REG_VERDICT)
9097 continue;
9098
9099 data = &priv->data;
9100 switch (data->verdict.code) {
9101 case NFT_JUMP:
9102 case NFT_GOTO:
9103 err = nf_tables_check_loops(ctx,
9104 data->verdict.chain);
9105 if (err < 0)
9106 return err;
9107 break;
9108 default:
9109 break;
9110 }
9111 }
9112 }
9113
9114 list_for_each_entry(set, &ctx->table->sets, list) {
9115 if (!nft_is_active_next(ctx->net, set))
9116 continue;
9117 if (!(set->flags & NFT_SET_MAP) ||
9118 set->dtype != NFT_DATA_VERDICT)
9119 continue;
9120
9121 list_for_each_entry(binding, &set->bindings, list) {
9122 if (!(binding->flags & NFT_SET_MAP) ||
9123 binding->chain != chain)
9124 continue;
9125
9126 iter.genmask = nft_genmask_next(ctx->net);
9127 iter.skip = 0;
9128 iter.count = 0;
9129 iter.err = 0;
9130 iter.fn = nf_tables_loop_check_setelem;
9131
9132 set->ops->walk(ctx, set, &iter);
9133 if (!iter.err)
9134 iter.err = nft_set_catchall_loops(ctx, set);
9135
9136 if (iter.err < 0)
9137 return iter.err;
9138 }
9139 }
9140
9141 return 0;
9142}
9143
9144
9145
9146
9147
9148
9149
9150
9151
9152
9153
9154
9155
9156int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9157{
9158 u32 val;
9159
9160 val = ntohl(nla_get_be32(attr));
9161 if (val > max)
9162 return -ERANGE;
9163
9164 *dest = val;
9165 return 0;
9166}
9167EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9168
9169static unsigned int nft_parse_register(const struct nlattr *attr)
9170{
9171 unsigned int reg;
9172
9173 reg = ntohl(nla_get_be32(attr));
9174 switch (reg) {
9175 case NFT_REG_VERDICT...NFT_REG_4:
9176 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9177 default:
9178 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9179 }
9180}
9181
9182
9183
9184
9185
9186
9187
9188
9189
9190
9191
9192
9193int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9194{
9195 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9196 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9197 else
9198 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9199
9200 return nla_put_be32(skb, attr, htonl(reg));
9201}
9202EXPORT_SYMBOL_GPL(nft_dump_register);
9203
9204static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9205{
9206 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9207 return -EINVAL;
9208 if (len == 0)
9209 return -EINVAL;
9210 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9211 return -ERANGE;
9212
9213 return 0;
9214}
9215
9216int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9217{
9218 u32 reg;
9219 int err;
9220
9221 reg = nft_parse_register(attr);
9222 err = nft_validate_register_load(reg, len);
9223 if (err < 0)
9224 return err;
9225
9226 *sreg = reg;
9227 return 0;
9228}
9229EXPORT_SYMBOL_GPL(nft_parse_register_load);
9230
9231static int nft_validate_register_store(const struct nft_ctx *ctx,
9232 enum nft_registers reg,
9233 const struct nft_data *data,
9234 enum nft_data_types type,
9235 unsigned int len)
9236{
9237 int err;
9238
9239 switch (reg) {
9240 case NFT_REG_VERDICT:
9241 if (type != NFT_DATA_VERDICT)
9242 return -EINVAL;
9243
9244 if (data != NULL &&
9245 (data->verdict.code == NFT_GOTO ||
9246 data->verdict.code == NFT_JUMP)) {
9247 err = nf_tables_check_loops(ctx, data->verdict.chain);
9248 if (err < 0)
9249 return err;
9250 }
9251
9252 return 0;
9253 default:
9254 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9255 return -EINVAL;
9256 if (len == 0)
9257 return -EINVAL;
9258 if (reg * NFT_REG32_SIZE + len >
9259 sizeof_field(struct nft_regs, data))
9260 return -ERANGE;
9261
9262 if (data != NULL && type != NFT_DATA_VALUE)
9263 return -EINVAL;
9264 return 0;
9265 }
9266}
9267
9268int nft_parse_register_store(const struct nft_ctx *ctx,
9269 const struct nlattr *attr, u8 *dreg,
9270 const struct nft_data *data,
9271 enum nft_data_types type, unsigned int len)
9272{
9273 int err;
9274 u32 reg;
9275
9276 reg = nft_parse_register(attr);
9277 err = nft_validate_register_store(ctx, reg, data, type, len);
9278 if (err < 0)
9279 return err;
9280
9281 *dreg = reg;
9282 return 0;
9283}
9284EXPORT_SYMBOL_GPL(nft_parse_register_store);
9285
9286static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9287 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9288 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9289 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9290 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9291};
9292
9293static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9294 struct nft_data_desc *desc, const struct nlattr *nla)
9295{
9296 u8 genmask = nft_genmask_next(ctx->net);
9297 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9298 struct nft_chain *chain;
9299 int err;
9300
9301 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9302 nft_verdict_policy, NULL);
9303 if (err < 0)
9304 return err;
9305
9306 if (!tb[NFTA_VERDICT_CODE])
9307 return -EINVAL;
9308 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9309
9310 switch (data->verdict.code) {
9311 default:
9312 switch (data->verdict.code & NF_VERDICT_MASK) {
9313 case NF_ACCEPT:
9314 case NF_DROP:
9315 case NF_QUEUE:
9316 break;
9317 default:
9318 return -EINVAL;
9319 }
9320 fallthrough;
9321 case NFT_CONTINUE:
9322 case NFT_BREAK:
9323 case NFT_RETURN:
9324 break;
9325 case NFT_JUMP:
9326 case NFT_GOTO:
9327 if (tb[NFTA_VERDICT_CHAIN]) {
9328 chain = nft_chain_lookup(ctx->net, ctx->table,
9329 tb[NFTA_VERDICT_CHAIN],
9330 genmask);
9331 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9332 chain = nft_chain_lookup_byid(ctx->net,
9333 tb[NFTA_VERDICT_CHAIN_ID]);
9334 if (IS_ERR(chain))
9335 return PTR_ERR(chain);
9336 } else {
9337 return -EINVAL;
9338 }
9339
9340 if (IS_ERR(chain))
9341 return PTR_ERR(chain);
9342 if (nft_is_base_chain(chain))
9343 return -EOPNOTSUPP;
9344
9345 chain->use++;
9346 data->verdict.chain = chain;
9347 break;
9348 }
9349
9350 desc->len = sizeof(data->verdict);
9351 desc->type = NFT_DATA_VERDICT;
9352 return 0;
9353}
9354
9355static void nft_verdict_uninit(const struct nft_data *data)
9356{
9357 struct nft_chain *chain;
9358 struct nft_rule *rule;
9359
9360 switch (data->verdict.code) {
9361 case NFT_JUMP:
9362 case NFT_GOTO:
9363 chain = data->verdict.chain;
9364 chain->use--;
9365
9366 if (!nft_chain_is_bound(chain))
9367 break;
9368
9369 chain->table->use--;
9370 list_for_each_entry(rule, &chain->rules, list)
9371 chain->use--;
9372
9373 nft_chain_del(chain);
9374 break;
9375 }
9376}
9377
9378int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9379{
9380 struct nlattr *nest;
9381
9382 nest = nla_nest_start_noflag(skb, type);
9383 if (!nest)
9384 goto nla_put_failure;
9385
9386 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9387 goto nla_put_failure;
9388
9389 switch (v->code) {
9390 case NFT_JUMP:
9391 case NFT_GOTO:
9392 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9393 v->chain->name))
9394 goto nla_put_failure;
9395 }
9396 nla_nest_end(skb, nest);
9397 return 0;
9398
9399nla_put_failure:
9400 return -1;
9401}
9402
9403static int nft_value_init(const struct nft_ctx *ctx,
9404 struct nft_data *data, unsigned int size,
9405 struct nft_data_desc *desc, const struct nlattr *nla)
9406{
9407 unsigned int len;
9408
9409 len = nla_len(nla);
9410 if (len == 0)
9411 return -EINVAL;
9412 if (len > size)
9413 return -EOVERFLOW;
9414
9415 nla_memcpy(data->data, nla, len);
9416 desc->type = NFT_DATA_VALUE;
9417 desc->len = len;
9418 return 0;
9419}
9420
9421static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9422 unsigned int len)
9423{
9424 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9425}
9426
9427static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9428 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9429 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9430};
9431
9432
9433
9434
9435
9436
9437
9438
9439
9440
9441
9442
9443
9444
9445
9446
9447int nft_data_init(const struct nft_ctx *ctx,
9448 struct nft_data *data, unsigned int size,
9449 struct nft_data_desc *desc, const struct nlattr *nla)
9450{
9451 struct nlattr *tb[NFTA_DATA_MAX + 1];
9452 int err;
9453
9454 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9455 nft_data_policy, NULL);
9456 if (err < 0)
9457 return err;
9458
9459 if (tb[NFTA_DATA_VALUE])
9460 return nft_value_init(ctx, data, size, desc,
9461 tb[NFTA_DATA_VALUE]);
9462 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9463 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9464 return -EINVAL;
9465}
9466EXPORT_SYMBOL_GPL(nft_data_init);
9467
9468
9469
9470
9471
9472
9473
9474
9475
9476
9477void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9478{
9479 if (type < NFT_DATA_VERDICT)
9480 return;
9481 switch (type) {
9482 case NFT_DATA_VERDICT:
9483 return nft_verdict_uninit(data);
9484 default:
9485 WARN_ON(1);
9486 }
9487}
9488EXPORT_SYMBOL_GPL(nft_data_release);
9489
9490int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9491 enum nft_data_types type, unsigned int len)
9492{
9493 struct nlattr *nest;
9494 int err;
9495
9496 nest = nla_nest_start_noflag(skb, attr);
9497 if (nest == NULL)
9498 return -1;
9499
9500 switch (type) {
9501 case NFT_DATA_VALUE:
9502 err = nft_value_dump(skb, data, len);
9503 break;
9504 case NFT_DATA_VERDICT:
9505 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9506 break;
9507 default:
9508 err = -EINVAL;
9509 WARN_ON(1);
9510 }
9511
9512 nla_nest_end(skb, nest);
9513 return err;
9514}
9515EXPORT_SYMBOL_GPL(nft_data_dump);
9516
9517int __nft_release_basechain(struct nft_ctx *ctx)
9518{
9519 struct nft_rule *rule, *nr;
9520
9521 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9522 return 0;
9523
9524 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9525 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9526 list_del(&rule->list);
9527 ctx->chain->use--;
9528 nf_tables_rule_release(ctx, rule);
9529 }
9530 nft_chain_del(ctx->chain);
9531 ctx->table->use--;
9532 nf_tables_chain_destroy(ctx);
9533
9534 return 0;
9535}
9536EXPORT_SYMBOL_GPL(__nft_release_basechain);
9537
9538static void __nft_release_hook(struct net *net, struct nft_table *table)
9539{
9540 struct nft_chain *chain;
9541
9542 list_for_each_entry(chain, &table->chains, list)
9543 nf_tables_unregister_hook(net, table, chain);
9544}
9545
9546static void __nft_release_hooks(struct net *net)
9547{
9548 struct nftables_pernet *nft_net = nft_pernet(net);
9549 struct nft_table *table;
9550
9551 list_for_each_entry(table, &nft_net->tables, list) {
9552 if (nft_table_has_owner(table))
9553 continue;
9554
9555 __nft_release_hook(net, table);
9556 }
9557}
9558
9559static void __nft_release_table(struct net *net, struct nft_table *table)
9560{
9561 struct nft_flowtable *flowtable, *nf;
9562 struct nft_chain *chain, *nc;
9563 struct nft_object *obj, *ne;
9564 struct nft_rule *rule, *nr;
9565 struct nft_set *set, *ns;
9566 struct nft_ctx ctx = {
9567 .net = net,
9568 .family = NFPROTO_NETDEV,
9569 };
9570
9571 ctx.family = table->family;
9572 ctx.table = table;
9573 list_for_each_entry(chain, &table->chains, list) {
9574 ctx.chain = chain;
9575 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9576 list_del(&rule->list);
9577 chain->use--;
9578 nf_tables_rule_release(&ctx, rule);
9579 }
9580 }
9581 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9582 list_del(&flowtable->list);
9583 table->use--;
9584 nf_tables_flowtable_destroy(flowtable);
9585 }
9586 list_for_each_entry_safe(set, ns, &table->sets, list) {
9587 list_del(&set->list);
9588 table->use--;
9589 nft_set_destroy(&ctx, set);
9590 }
9591 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9592 nft_obj_del(obj);
9593 table->use--;
9594 nft_obj_destroy(&ctx, obj);
9595 }
9596 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9597 ctx.chain = chain;
9598 nft_chain_del(chain);
9599 table->use--;
9600 nf_tables_chain_destroy(&ctx);
9601 }
9602 list_del(&table->list);
9603 nf_tables_table_destroy(&ctx);
9604}
9605
9606static void __nft_release_tables(struct net *net)
9607{
9608 struct nftables_pernet *nft_net = nft_pernet(net);
9609 struct nft_table *table, *nt;
9610
9611 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9612 if (nft_table_has_owner(table))
9613 continue;
9614
9615 __nft_release_table(net, table);
9616 }
9617}
9618
9619static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9620 void *ptr)
9621{
9622 struct nftables_pernet *nft_net;
9623 struct netlink_notify *n = ptr;
9624 struct nft_table *table, *nt;
9625 struct net *net = n->net;
9626 bool release = false;
9627
9628 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9629 return NOTIFY_DONE;
9630
9631 nft_net = nft_pernet(net);
9632 mutex_lock(&nft_net->commit_mutex);
9633 list_for_each_entry(table, &nft_net->tables, list) {
9634 if (nft_table_has_owner(table) &&
9635 n->portid == table->nlpid) {
9636 __nft_release_hook(net, table);
9637 release = true;
9638 }
9639 }
9640 if (release) {
9641 synchronize_rcu();
9642 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9643 if (nft_table_has_owner(table) &&
9644 n->portid == table->nlpid)
9645 __nft_release_table(net, table);
9646 }
9647 }
9648 mutex_unlock(&nft_net->commit_mutex);
9649
9650 return NOTIFY_DONE;
9651}
9652
9653static struct notifier_block nft_nl_notifier = {
9654 .notifier_call = nft_rcv_nl_event,
9655};
9656
9657static int __net_init nf_tables_init_net(struct net *net)
9658{
9659 struct nftables_pernet *nft_net = nft_pernet(net);
9660
9661 INIT_LIST_HEAD(&nft_net->tables);
9662 INIT_LIST_HEAD(&nft_net->commit_list);
9663 INIT_LIST_HEAD(&nft_net->module_list);
9664 INIT_LIST_HEAD(&nft_net->notify_list);
9665 mutex_init(&nft_net->commit_mutex);
9666 nft_net->base_seq = 1;
9667 nft_net->validate_state = NFT_VALIDATE_SKIP;
9668
9669 return 0;
9670}
9671
9672static void __net_exit nf_tables_pre_exit_net(struct net *net)
9673{
9674 __nft_release_hooks(net);
9675}
9676
9677static void __net_exit nf_tables_exit_net(struct net *net)
9678{
9679 struct nftables_pernet *nft_net = nft_pernet(net);
9680
9681 mutex_lock(&nft_net->commit_mutex);
9682 if (!list_empty(&nft_net->commit_list))
9683 __nf_tables_abort(net, NFNL_ABORT_NONE);
9684 __nft_release_tables(net);
9685 mutex_unlock(&nft_net->commit_mutex);
9686 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9687 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9688 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9689}
9690
9691static struct pernet_operations nf_tables_net_ops = {
9692 .init = nf_tables_init_net,
9693 .pre_exit = nf_tables_pre_exit_net,
9694 .exit = nf_tables_exit_net,
9695 .id = &nf_tables_net_id,
9696 .size = sizeof(struct nftables_pernet),
9697};
9698
9699static int __init nf_tables_module_init(void)
9700{
9701 int err;
9702
9703 err = register_pernet_subsys(&nf_tables_net_ops);
9704 if (err < 0)
9705 return err;
9706
9707 err = nft_chain_filter_init();
9708 if (err < 0)
9709 goto err_chain_filter;
9710
9711 err = nf_tables_core_module_init();
9712 if (err < 0)
9713 goto err_core_module;
9714
9715 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9716 if (err < 0)
9717 goto err_netdev_notifier;
9718
9719 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9720 if (err < 0)
9721 goto err_rht_objname;
9722
9723 err = nft_offload_init();
9724 if (err < 0)
9725 goto err_offload;
9726
9727 err = netlink_register_notifier(&nft_nl_notifier);
9728 if (err < 0)
9729 goto err_netlink_notifier;
9730
9731
9732 err = nfnetlink_subsys_register(&nf_tables_subsys);
9733 if (err < 0)
9734 goto err_nfnl_subsys;
9735
9736 nft_chain_route_init();
9737
9738 return err;
9739
9740err_nfnl_subsys:
9741 netlink_unregister_notifier(&nft_nl_notifier);
9742err_netlink_notifier:
9743 nft_offload_exit();
9744err_offload:
9745 rhltable_destroy(&nft_objname_ht);
9746err_rht_objname:
9747 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9748err_netdev_notifier:
9749 nf_tables_core_module_exit();
9750err_core_module:
9751 nft_chain_filter_fini();
9752err_chain_filter:
9753 unregister_pernet_subsys(&nf_tables_net_ops);
9754 return err;
9755}
9756
9757static void __exit nf_tables_module_exit(void)
9758{
9759 nfnetlink_subsys_unregister(&nf_tables_subsys);
9760 netlink_unregister_notifier(&nft_nl_notifier);
9761 nft_offload_exit();
9762 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9763 nft_chain_filter_fini();
9764 nft_chain_route_fini();
9765 unregister_pernet_subsys(&nf_tables_net_ops);
9766 cancel_work_sync(&trans_destroy_work);
9767 rcu_barrier();
9768 rhltable_destroy(&nft_objname_ht);
9769 nf_tables_core_module_exit();
9770}
9771
9772module_init(nf_tables_module_init);
9773module_exit(nf_tables_module_exit);
9774
9775MODULE_LICENSE("GPL");
9776MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9777MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
9778