1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 *
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
6 */
7
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
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 #define NFT_SET_MAX_ANONLEN 16
28
29 unsigned int nf_tables_net_id __read_mostly;
30
31 static LIST_HEAD(nf_tables_expressions);
32 static LIST_HEAD(nf_tables_objects);
33 static LIST_HEAD(nf_tables_flowtables);
34 static LIST_HEAD(nf_tables_destroy_list);
35 static LIST_HEAD(nf_tables_gc_list);
36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
38
39 enum {
40 NFT_VALIDATE_SKIP = 0,
41 NFT_VALIDATE_NEED,
42 NFT_VALIDATE_DO,
43 };
44
45 static struct rhltable nft_objname_ht;
46
47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
50
51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
54
55 static const struct rhashtable_params nft_chain_ht_params = {
56 .head_offset = offsetof(struct nft_chain, rhlhead),
57 .key_offset = offsetof(struct nft_chain, name),
58 .hashfn = nft_chain_hash,
59 .obj_hashfn = nft_chain_hash_obj,
60 .obj_cmpfn = nft_chain_hash_cmp,
61 .automatic_shrinking = true,
62 };
63
64 static const struct rhashtable_params nft_objname_ht_params = {
65 .head_offset = offsetof(struct nft_object, rhlhead),
66 .key_offset = offsetof(struct nft_object, key),
67 .hashfn = nft_objname_hash,
68 .obj_hashfn = nft_objname_hash_obj,
69 .obj_cmpfn = nft_objname_hash_cmp,
70 .automatic_shrinking = true,
71 };
72
73 struct nft_audit_data {
74 struct nft_table *table;
75 int entries;
76 int op;
77 struct list_head list;
78 };
79
80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
81 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
82 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
84 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
85 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
87 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
88 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
90 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
91 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
93 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
94 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
96 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
97 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
100 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
101 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
102 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
103 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
104 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
105 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
107 };
108
nft_validate_state_update(struct nft_table * table,u8 new_validate_state)109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
110 {
111 switch (table->validate_state) {
112 case NFT_VALIDATE_SKIP:
113 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 break;
115 case NFT_VALIDATE_NEED:
116 break;
117 case NFT_VALIDATE_DO:
118 if (new_validate_state == NFT_VALIDATE_NEED)
119 return;
120 }
121
122 table->validate_state = new_validate_state;
123 }
124 static void nf_tables_trans_destroy_work(struct work_struct *w);
125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126
127 static void nft_trans_gc_work(struct work_struct *work);
128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
129
nft_ctx_init(struct nft_ctx * ctx,struct net * net,const struct sk_buff * skb,const struct nlmsghdr * nlh,u8 family,struct nft_table * table,struct nft_chain * chain,const struct nlattr * const * nla)130 static void nft_ctx_init(struct nft_ctx *ctx,
131 struct net *net,
132 const struct sk_buff *skb,
133 const struct nlmsghdr *nlh,
134 u8 family,
135 struct nft_table *table,
136 struct nft_chain *chain,
137 const struct nlattr * const *nla)
138 {
139 ctx->net = net;
140 ctx->family = family;
141 ctx->level = 0;
142 ctx->table = table;
143 ctx->chain = chain;
144 ctx->nla = nla;
145 ctx->portid = NETLINK_CB(skb).portid;
146 ctx->report = nlmsg_report(nlh);
147 ctx->flags = nlh->nlmsg_flags;
148 ctx->seq = nlh->nlmsg_seq;
149 }
150
nft_trans_alloc_gfp(const struct nft_ctx * ctx,int msg_type,u32 size,gfp_t gfp)151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
152 int msg_type, u32 size, gfp_t gfp)
153 {
154 struct nft_trans *trans;
155
156 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
157 if (trans == NULL)
158 return NULL;
159
160 INIT_LIST_HEAD(&trans->list);
161 INIT_LIST_HEAD(&trans->binding_list);
162 trans->msg_type = msg_type;
163 trans->ctx = *ctx;
164
165 return trans;
166 }
167
nft_trans_alloc(const struct nft_ctx * ctx,int msg_type,u32 size)168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
169 int msg_type, u32 size)
170 {
171 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
172 }
173
nft_trans_list_del(struct nft_trans * trans)174 static void nft_trans_list_del(struct nft_trans *trans)
175 {
176 list_del(&trans->list);
177 list_del(&trans->binding_list);
178 }
179
nft_trans_destroy(struct nft_trans * trans)180 static void nft_trans_destroy(struct nft_trans *trans)
181 {
182 nft_trans_list_del(trans);
183 kfree(trans);
184 }
185
__nft_set_trans_bind(const struct nft_ctx * ctx,struct nft_set * set,bool bind)186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
187 bool bind)
188 {
189 struct nftables_pernet *nft_net;
190 struct net *net = ctx->net;
191 struct nft_trans *trans;
192
193 if (!nft_set_is_anonymous(set))
194 return;
195
196 nft_net = nft_pernet(net);
197 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
198 switch (trans->msg_type) {
199 case NFT_MSG_NEWSET:
200 if (nft_trans_set(trans) == set)
201 nft_trans_set_bound(trans) = bind;
202 break;
203 case NFT_MSG_NEWSETELEM:
204 if (nft_trans_elem_set(trans) == set)
205 nft_trans_elem_set_bound(trans) = bind;
206 break;
207 }
208 }
209 }
210
nft_set_trans_bind(const struct nft_ctx * ctx,struct nft_set * set)211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
212 {
213 return __nft_set_trans_bind(ctx, set, true);
214 }
215
nft_set_trans_unbind(const struct nft_ctx * ctx,struct nft_set * set)216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
217 {
218 return __nft_set_trans_bind(ctx, set, false);
219 }
220
__nft_chain_trans_bind(const struct nft_ctx * ctx,struct nft_chain * chain,bool bind)221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
222 struct nft_chain *chain, bool bind)
223 {
224 struct nftables_pernet *nft_net;
225 struct net *net = ctx->net;
226 struct nft_trans *trans;
227
228 if (!nft_chain_binding(chain))
229 return;
230
231 nft_net = nft_pernet(net);
232 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
233 switch (trans->msg_type) {
234 case NFT_MSG_NEWCHAIN:
235 if (nft_trans_chain(trans) == chain)
236 nft_trans_chain_bound(trans) = bind;
237 break;
238 case NFT_MSG_NEWRULE:
239 if (trans->ctx.chain == chain)
240 nft_trans_rule_bound(trans) = bind;
241 break;
242 }
243 }
244 }
245
nft_chain_trans_bind(const struct nft_ctx * ctx,struct nft_chain * chain)246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
247 struct nft_chain *chain)
248 {
249 __nft_chain_trans_bind(ctx, chain, true);
250 }
251
nf_tables_bind_chain(const struct nft_ctx * ctx,struct nft_chain * chain)252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
253 {
254 if (!nft_chain_binding(chain))
255 return 0;
256
257 if (nft_chain_binding(ctx->chain))
258 return -EOPNOTSUPP;
259
260 if (chain->bound)
261 return -EBUSY;
262
263 if (!nft_use_inc(&chain->use))
264 return -EMFILE;
265
266 chain->bound = true;
267 nft_chain_trans_bind(ctx, chain);
268
269 return 0;
270 }
271
nf_tables_unbind_chain(const struct nft_ctx * ctx,struct nft_chain * chain)272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
273 {
274 __nft_chain_trans_bind(ctx, chain, false);
275 }
276
nft_netdev_register_hooks(struct net * net,struct list_head * hook_list)277 static int nft_netdev_register_hooks(struct net *net,
278 struct list_head *hook_list)
279 {
280 struct nft_hook *hook;
281 int err, j;
282
283 j = 0;
284 list_for_each_entry(hook, hook_list, list) {
285 err = nf_register_net_hook(net, &hook->ops);
286 if (err < 0)
287 goto err_register;
288
289 j++;
290 }
291 return 0;
292
293 err_register:
294 list_for_each_entry(hook, hook_list, list) {
295 if (j-- <= 0)
296 break;
297
298 nf_unregister_net_hook(net, &hook->ops);
299 }
300 return err;
301 }
302
nft_netdev_unregister_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)303 static void nft_netdev_unregister_hooks(struct net *net,
304 struct list_head *hook_list,
305 bool release_netdev)
306 {
307 struct nft_hook *hook, *next;
308
309 list_for_each_entry_safe(hook, next, hook_list, list) {
310 nf_unregister_net_hook(net, &hook->ops);
311 if (release_netdev) {
312 list_del(&hook->list);
313 kfree_rcu(hook, rcu);
314 }
315 }
316 }
317
nf_tables_register_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain)318 static int nf_tables_register_hook(struct net *net,
319 const struct nft_table *table,
320 struct nft_chain *chain)
321 {
322 struct nft_base_chain *basechain;
323 const struct nf_hook_ops *ops;
324
325 if (table->flags & NFT_TABLE_F_DORMANT ||
326 !nft_is_base_chain(chain))
327 return 0;
328
329 basechain = nft_base_chain(chain);
330 ops = &basechain->ops;
331
332 if (basechain->type->ops_register)
333 return basechain->type->ops_register(net, ops);
334
335 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
336 return nft_netdev_register_hooks(net, &basechain->hook_list);
337
338 return nf_register_net_hook(net, &basechain->ops);
339 }
340
__nf_tables_unregister_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain,bool release_netdev)341 static void __nf_tables_unregister_hook(struct net *net,
342 const struct nft_table *table,
343 struct nft_chain *chain,
344 bool release_netdev)
345 {
346 struct nft_base_chain *basechain;
347 const struct nf_hook_ops *ops;
348
349 if (table->flags & NFT_TABLE_F_DORMANT ||
350 !nft_is_base_chain(chain))
351 return;
352 basechain = nft_base_chain(chain);
353 ops = &basechain->ops;
354
355 if (basechain->type->ops_unregister)
356 return basechain->type->ops_unregister(net, ops);
357
358 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
359 nft_netdev_unregister_hooks(net, &basechain->hook_list,
360 release_netdev);
361 else
362 nf_unregister_net_hook(net, &basechain->ops);
363 }
364
nf_tables_unregister_hook(struct net * net,const struct nft_table * table,struct nft_chain * chain)365 static void nf_tables_unregister_hook(struct net *net,
366 const struct nft_table *table,
367 struct nft_chain *chain)
368 {
369 return __nf_tables_unregister_hook(net, table, chain, false);
370 }
371
nft_trans_commit_list_add_tail(struct net * net,struct nft_trans * trans)372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
373 {
374 struct nftables_pernet *nft_net = nft_pernet(net);
375
376 switch (trans->msg_type) {
377 case NFT_MSG_NEWSET:
378 if (!nft_trans_set_update(trans) &&
379 nft_set_is_anonymous(nft_trans_set(trans)))
380 list_add_tail(&trans->binding_list, &nft_net->binding_list);
381 break;
382 case NFT_MSG_NEWCHAIN:
383 if (!nft_trans_chain_update(trans) &&
384 nft_chain_binding(nft_trans_chain(trans)))
385 list_add_tail(&trans->binding_list, &nft_net->binding_list);
386 break;
387 }
388
389 list_add_tail(&trans->list, &nft_net->commit_list);
390 }
391
nft_trans_table_add(struct nft_ctx * ctx,int msg_type)392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
393 {
394 struct nft_trans *trans;
395
396 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
397 if (trans == NULL)
398 return -ENOMEM;
399
400 if (msg_type == NFT_MSG_NEWTABLE)
401 nft_activate_next(ctx->net, ctx->table);
402
403 nft_trans_commit_list_add_tail(ctx->net, trans);
404 return 0;
405 }
406
nft_deltable(struct nft_ctx * ctx)407 static int nft_deltable(struct nft_ctx *ctx)
408 {
409 int err;
410
411 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
412 if (err < 0)
413 return err;
414
415 nft_deactivate_next(ctx->net, ctx->table);
416 return err;
417 }
418
nft_trans_chain_add(struct nft_ctx * ctx,int msg_type)419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
420 {
421 struct nft_trans *trans;
422
423 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
424 if (trans == NULL)
425 return ERR_PTR(-ENOMEM);
426
427 if (msg_type == NFT_MSG_NEWCHAIN) {
428 nft_activate_next(ctx->net, ctx->chain);
429
430 if (ctx->nla[NFTA_CHAIN_ID]) {
431 nft_trans_chain_id(trans) =
432 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
433 }
434 }
435 nft_trans_chain(trans) = ctx->chain;
436 nft_trans_commit_list_add_tail(ctx->net, trans);
437
438 return trans;
439 }
440
nft_delchain(struct nft_ctx * ctx)441 static int nft_delchain(struct nft_ctx *ctx)
442 {
443 struct nft_trans *trans;
444
445 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
446 if (IS_ERR(trans))
447 return PTR_ERR(trans);
448
449 nft_use_dec(&ctx->table->use);
450 nft_deactivate_next(ctx->net, ctx->chain);
451
452 return 0;
453 }
454
nft_rule_expr_activate(const struct nft_ctx * ctx,struct nft_rule * rule)455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
456 {
457 struct nft_expr *expr;
458
459 expr = nft_expr_first(rule);
460 while (nft_expr_more(rule, expr)) {
461 if (expr->ops->activate)
462 expr->ops->activate(ctx, expr);
463
464 expr = nft_expr_next(expr);
465 }
466 }
467
nft_rule_expr_deactivate(const struct nft_ctx * ctx,struct nft_rule * rule,enum nft_trans_phase phase)468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
469 enum nft_trans_phase phase)
470 {
471 struct nft_expr *expr;
472
473 expr = nft_expr_first(rule);
474 while (nft_expr_more(rule, expr)) {
475 if (expr->ops->deactivate)
476 expr->ops->deactivate(ctx, expr, phase);
477
478 expr = nft_expr_next(expr);
479 }
480 }
481
482 static int
nf_tables_delrule_deactivate(struct nft_ctx * ctx,struct nft_rule * rule)483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
484 {
485 /* You cannot delete the same rule twice */
486 if (nft_is_active_next(ctx->net, rule)) {
487 nft_deactivate_next(ctx->net, rule);
488 nft_use_dec(&ctx->chain->use);
489 return 0;
490 }
491 return -ENOENT;
492 }
493
nft_trans_rule_add(struct nft_ctx * ctx,int msg_type,struct nft_rule * rule)494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
495 struct nft_rule *rule)
496 {
497 struct nft_trans *trans;
498
499 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
500 if (trans == NULL)
501 return NULL;
502
503 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
504 nft_trans_rule_id(trans) =
505 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
506 }
507 nft_trans_rule(trans) = rule;
508 nft_trans_commit_list_add_tail(ctx->net, trans);
509
510 return trans;
511 }
512
nft_delrule(struct nft_ctx * ctx,struct nft_rule * rule)513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
514 {
515 struct nft_flow_rule *flow;
516 struct nft_trans *trans;
517 int err;
518
519 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
520 if (trans == NULL)
521 return -ENOMEM;
522
523 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
524 flow = nft_flow_rule_create(ctx->net, rule);
525 if (IS_ERR(flow)) {
526 nft_trans_destroy(trans);
527 return PTR_ERR(flow);
528 }
529
530 nft_trans_flow_rule(trans) = flow;
531 }
532
533 err = nf_tables_delrule_deactivate(ctx, rule);
534 if (err < 0) {
535 nft_trans_destroy(trans);
536 return err;
537 }
538 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
539
540 return 0;
541 }
542
nft_delrule_by_chain(struct nft_ctx * ctx)543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
544 {
545 struct nft_rule *rule;
546 int err;
547
548 list_for_each_entry(rule, &ctx->chain->rules, list) {
549 if (!nft_is_active_next(ctx->net, rule))
550 continue;
551
552 err = nft_delrule(ctx, rule);
553 if (err < 0)
554 return err;
555 }
556 return 0;
557 }
558
__nft_trans_set_add(const struct nft_ctx * ctx,int msg_type,struct nft_set * set,const struct nft_set_desc * desc)559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
560 struct nft_set *set,
561 const struct nft_set_desc *desc)
562 {
563 struct nft_trans *trans;
564
565 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
566 if (trans == NULL)
567 return -ENOMEM;
568
569 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
570 nft_trans_set_id(trans) =
571 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
572 nft_activate_next(ctx->net, set);
573 }
574 nft_trans_set(trans) = set;
575 if (desc) {
576 nft_trans_set_update(trans) = true;
577 nft_trans_set_gc_int(trans) = desc->gc_int;
578 nft_trans_set_timeout(trans) = desc->timeout;
579 nft_trans_set_size(trans) = desc->size;
580 }
581 nft_trans_commit_list_add_tail(ctx->net, trans);
582
583 return 0;
584 }
585
nft_trans_set_add(const struct nft_ctx * ctx,int msg_type,struct nft_set * set)586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
587 struct nft_set *set)
588 {
589 return __nft_trans_set_add(ctx, msg_type, set, NULL);
590 }
591
nft_mapelem_deactivate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
593 struct nft_set *set,
594 const struct nft_set_iter *iter,
595 struct nft_set_elem *elem)
596 {
597 nft_setelem_data_deactivate(ctx->net, set, elem);
598
599 return 0;
600 }
601
602 struct nft_set_elem_catchall {
603 struct list_head list;
604 struct rcu_head rcu;
605 void *elem;
606 };
607
nft_map_catchall_deactivate(const struct nft_ctx * ctx,struct nft_set * set)608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
609 struct nft_set *set)
610 {
611 u8 genmask = nft_genmask_next(ctx->net);
612 struct nft_set_elem_catchall *catchall;
613 struct nft_set_elem elem;
614 struct nft_set_ext *ext;
615
616 list_for_each_entry(catchall, &set->catchall_list, list) {
617 ext = nft_set_elem_ext(set, catchall->elem);
618 if (!nft_set_elem_active(ext, genmask))
619 continue;
620
621 elem.priv = catchall->elem;
622 nft_setelem_data_deactivate(ctx->net, set, &elem);
623 break;
624 }
625 }
626
nft_map_deactivate(const struct nft_ctx * ctx,struct nft_set * set)627 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
628 {
629 struct nft_set_iter iter = {
630 .genmask = nft_genmask_next(ctx->net),
631 .fn = nft_mapelem_deactivate,
632 };
633
634 set->ops->walk(ctx, set, &iter);
635 WARN_ON_ONCE(iter.err);
636
637 nft_map_catchall_deactivate(ctx, set);
638 }
639
nft_delset(const struct nft_ctx * ctx,struct nft_set * set)640 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
641 {
642 int err;
643
644 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
645 if (err < 0)
646 return err;
647
648 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
649 nft_map_deactivate(ctx, set);
650
651 nft_deactivate_next(ctx->net, set);
652 nft_use_dec(&ctx->table->use);
653
654 return err;
655 }
656
nft_trans_obj_add(struct nft_ctx * ctx,int msg_type,struct nft_object * obj)657 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
658 struct nft_object *obj)
659 {
660 struct nft_trans *trans;
661
662 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
663 if (trans == NULL)
664 return -ENOMEM;
665
666 if (msg_type == NFT_MSG_NEWOBJ)
667 nft_activate_next(ctx->net, obj);
668
669 nft_trans_obj(trans) = obj;
670 nft_trans_commit_list_add_tail(ctx->net, trans);
671
672 return 0;
673 }
674
nft_delobj(struct nft_ctx * ctx,struct nft_object * obj)675 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
676 {
677 int err;
678
679 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
680 if (err < 0)
681 return err;
682
683 nft_deactivate_next(ctx->net, obj);
684 nft_use_dec(&ctx->table->use);
685
686 return err;
687 }
688
689 static struct nft_trans *
nft_trans_flowtable_add(struct nft_ctx * ctx,int msg_type,struct nft_flowtable * flowtable)690 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
691 struct nft_flowtable *flowtable)
692 {
693 struct nft_trans *trans;
694
695 trans = nft_trans_alloc(ctx, msg_type,
696 sizeof(struct nft_trans_flowtable));
697 if (trans == NULL)
698 return ERR_PTR(-ENOMEM);
699
700 if (msg_type == NFT_MSG_NEWFLOWTABLE)
701 nft_activate_next(ctx->net, flowtable);
702
703 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
704 nft_trans_flowtable(trans) = flowtable;
705 nft_trans_commit_list_add_tail(ctx->net, trans);
706
707 return trans;
708 }
709
nft_delflowtable(struct nft_ctx * ctx,struct nft_flowtable * flowtable)710 static int nft_delflowtable(struct nft_ctx *ctx,
711 struct nft_flowtable *flowtable)
712 {
713 struct nft_trans *trans;
714
715 trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
716 if (IS_ERR(trans))
717 return PTR_ERR(trans);
718
719 nft_deactivate_next(ctx->net, flowtable);
720 nft_use_dec(&ctx->table->use);
721
722 return 0;
723 }
724
__nft_reg_track_clobber(struct nft_regs_track * track,u8 dreg)725 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
726 {
727 int i;
728
729 for (i = track->regs[dreg].num_reg; i > 0; i--)
730 __nft_reg_track_cancel(track, dreg - i);
731 }
732
__nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 num_reg)733 static void __nft_reg_track_update(struct nft_regs_track *track,
734 const struct nft_expr *expr,
735 u8 dreg, u8 num_reg)
736 {
737 track->regs[dreg].selector = expr;
738 track->regs[dreg].bitwise = NULL;
739 track->regs[dreg].num_reg = num_reg;
740 }
741
nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 len)742 void nft_reg_track_update(struct nft_regs_track *track,
743 const struct nft_expr *expr, u8 dreg, u8 len)
744 {
745 unsigned int regcount;
746 int i;
747
748 __nft_reg_track_clobber(track, dreg);
749
750 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
751 for (i = 0; i < regcount; i++, dreg++)
752 __nft_reg_track_update(track, expr, dreg, i);
753 }
754 EXPORT_SYMBOL_GPL(nft_reg_track_update);
755
nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg,u8 len)756 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
757 {
758 unsigned int regcount;
759 int i;
760
761 __nft_reg_track_clobber(track, dreg);
762
763 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
764 for (i = 0; i < regcount; i++, dreg++)
765 __nft_reg_track_cancel(track, dreg);
766 }
767 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
768
__nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg)769 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
770 {
771 track->regs[dreg].selector = NULL;
772 track->regs[dreg].bitwise = NULL;
773 track->regs[dreg].num_reg = 0;
774 }
775 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
776
777 /*
778 * Tables
779 */
780
nft_table_lookup(const struct net * net,const struct nlattr * nla,u8 family,u8 genmask,u32 nlpid)781 static struct nft_table *nft_table_lookup(const struct net *net,
782 const struct nlattr *nla,
783 u8 family, u8 genmask, u32 nlpid)
784 {
785 struct nftables_pernet *nft_net;
786 struct nft_table *table;
787
788 if (nla == NULL)
789 return ERR_PTR(-EINVAL);
790
791 nft_net = nft_pernet(net);
792 list_for_each_entry_rcu(table, &nft_net->tables, list,
793 lockdep_is_held(&nft_net->commit_mutex)) {
794 if (!nla_strcmp(nla, table->name) &&
795 table->family == family &&
796 nft_active_genmask(table, genmask)) {
797 if (nft_table_has_owner(table) &&
798 nlpid && table->nlpid != nlpid)
799 return ERR_PTR(-EPERM);
800
801 return table;
802 }
803 }
804
805 return ERR_PTR(-ENOENT);
806 }
807
nft_table_lookup_byhandle(const struct net * net,const struct nlattr * nla,int family,u8 genmask,u32 nlpid)808 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
809 const struct nlattr *nla,
810 int family, u8 genmask, u32 nlpid)
811 {
812 struct nftables_pernet *nft_net;
813 struct nft_table *table;
814
815 nft_net = nft_pernet(net);
816 list_for_each_entry(table, &nft_net->tables, list) {
817 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
818 table->family == family &&
819 nft_active_genmask(table, genmask)) {
820 if (nft_table_has_owner(table) &&
821 nlpid && table->nlpid != nlpid)
822 return ERR_PTR(-EPERM);
823
824 return table;
825 }
826 }
827
828 return ERR_PTR(-ENOENT);
829 }
830
nf_tables_alloc_handle(struct nft_table * table)831 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
832 {
833 return ++table->hgenerator;
834 }
835
836 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
837
838 static const struct nft_chain_type *
__nft_chain_type_get(u8 family,enum nft_chain_types type)839 __nft_chain_type_get(u8 family, enum nft_chain_types type)
840 {
841 if (family >= NFPROTO_NUMPROTO ||
842 type >= NFT_CHAIN_T_MAX)
843 return NULL;
844
845 return chain_type[family][type];
846 }
847
848 static const struct nft_chain_type *
__nf_tables_chain_type_lookup(const struct nlattr * nla,u8 family)849 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
850 {
851 const struct nft_chain_type *type;
852 int i;
853
854 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
855 type = __nft_chain_type_get(family, i);
856 if (!type)
857 continue;
858 if (!nla_strcmp(nla, type->name))
859 return type;
860 }
861 return NULL;
862 }
863
864 struct nft_module_request {
865 struct list_head list;
866 char module[MODULE_NAME_LEN];
867 bool done;
868 };
869
870 #ifdef CONFIG_MODULES
nft_request_module(struct net * net,const char * fmt,...)871 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
872 ...)
873 {
874 char module_name[MODULE_NAME_LEN];
875 struct nftables_pernet *nft_net;
876 struct nft_module_request *req;
877 va_list args;
878 int ret;
879
880 va_start(args, fmt);
881 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
882 va_end(args);
883 if (ret >= MODULE_NAME_LEN)
884 return 0;
885
886 nft_net = nft_pernet(net);
887 list_for_each_entry(req, &nft_net->module_list, list) {
888 if (!strcmp(req->module, module_name)) {
889 if (req->done)
890 return 0;
891
892 /* A request to load this module already exists. */
893 return -EAGAIN;
894 }
895 }
896
897 req = kmalloc(sizeof(*req), GFP_KERNEL);
898 if (!req)
899 return -ENOMEM;
900
901 req->done = false;
902 strscpy(req->module, module_name, MODULE_NAME_LEN);
903 list_add_tail(&req->list, &nft_net->module_list);
904
905 return -EAGAIN;
906 }
907 EXPORT_SYMBOL_GPL(nft_request_module);
908 #endif
909
lockdep_nfnl_nft_mutex_not_held(void)910 static void lockdep_nfnl_nft_mutex_not_held(void)
911 {
912 #ifdef CONFIG_PROVE_LOCKING
913 if (debug_locks)
914 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
915 #endif
916 }
917
918 static const struct nft_chain_type *
nf_tables_chain_type_lookup(struct net * net,const struct nlattr * nla,u8 family,bool autoload)919 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
920 u8 family, bool autoload)
921 {
922 const struct nft_chain_type *type;
923
924 type = __nf_tables_chain_type_lookup(nla, family);
925 if (type != NULL)
926 return type;
927
928 lockdep_nfnl_nft_mutex_not_held();
929 #ifdef CONFIG_MODULES
930 if (autoload) {
931 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
932 nla_len(nla),
933 (const char *)nla_data(nla)) == -EAGAIN)
934 return ERR_PTR(-EAGAIN);
935 }
936 #endif
937 return ERR_PTR(-ENOENT);
938 }
939
nft_base_seq(const struct net * net)940 static __be16 nft_base_seq(const struct net *net)
941 {
942 struct nftables_pernet *nft_net = nft_pernet(net);
943
944 return htons(nft_net->base_seq & 0xffff);
945 }
946
947 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
948 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
949 .len = NFT_TABLE_MAXNAMELEN - 1 },
950 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
951 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
952 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
953 .len = NFT_USERDATA_MAXLEN }
954 };
955
nf_tables_fill_table_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table)956 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
957 u32 portid, u32 seq, int event, u32 flags,
958 int family, const struct nft_table *table)
959 {
960 struct nlmsghdr *nlh;
961
962 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
963 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
964 NFNETLINK_V0, nft_base_seq(net));
965 if (!nlh)
966 goto nla_put_failure;
967
968 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
969 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
970 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
971 NFTA_TABLE_PAD))
972 goto nla_put_failure;
973
974 if (event == NFT_MSG_DELTABLE) {
975 nlmsg_end(skb, nlh);
976 return 0;
977 }
978
979 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
980 htonl(table->flags & NFT_TABLE_F_MASK)))
981 goto nla_put_failure;
982
983 if (nft_table_has_owner(table) &&
984 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
985 goto nla_put_failure;
986
987 if (table->udata) {
988 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
989 goto nla_put_failure;
990 }
991
992 nlmsg_end(skb, nlh);
993 return 0;
994
995 nla_put_failure:
996 nlmsg_trim(skb, nlh);
997 return -1;
998 }
999
1000 struct nftnl_skb_parms {
1001 bool report;
1002 };
1003 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1004
nft_notify_enqueue(struct sk_buff * skb,bool report,struct list_head * notify_list)1005 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1006 struct list_head *notify_list)
1007 {
1008 NFT_CB(skb).report = report;
1009 list_add_tail(&skb->list, notify_list);
1010 }
1011
nf_tables_table_notify(const struct nft_ctx * ctx,int event)1012 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1013 {
1014 struct nftables_pernet *nft_net;
1015 struct sk_buff *skb;
1016 u16 flags = 0;
1017 int err;
1018
1019 if (!ctx->report &&
1020 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1021 return;
1022
1023 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1024 if (skb == NULL)
1025 goto err;
1026
1027 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1028 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1029
1030 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1031 event, flags, ctx->family, ctx->table);
1032 if (err < 0) {
1033 kfree_skb(skb);
1034 goto err;
1035 }
1036
1037 nft_net = nft_pernet(ctx->net);
1038 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1039 return;
1040 err:
1041 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1042 }
1043
nf_tables_dump_tables(struct sk_buff * skb,struct netlink_callback * cb)1044 static int nf_tables_dump_tables(struct sk_buff *skb,
1045 struct netlink_callback *cb)
1046 {
1047 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1048 struct nftables_pernet *nft_net;
1049 const struct nft_table *table;
1050 unsigned int idx = 0, s_idx = cb->args[0];
1051 struct net *net = sock_net(skb->sk);
1052 int family = nfmsg->nfgen_family;
1053
1054 rcu_read_lock();
1055 nft_net = nft_pernet(net);
1056 cb->seq = READ_ONCE(nft_net->base_seq);
1057
1058 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1059 if (family != NFPROTO_UNSPEC && family != table->family)
1060 continue;
1061
1062 if (idx < s_idx)
1063 goto cont;
1064 if (idx > s_idx)
1065 memset(&cb->args[1], 0,
1066 sizeof(cb->args) - sizeof(cb->args[0]));
1067 if (!nft_is_active(net, table))
1068 continue;
1069 if (nf_tables_fill_table_info(skb, net,
1070 NETLINK_CB(cb->skb).portid,
1071 cb->nlh->nlmsg_seq,
1072 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1073 table->family, table) < 0)
1074 goto done;
1075
1076 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1077 cont:
1078 idx++;
1079 }
1080 done:
1081 rcu_read_unlock();
1082 cb->args[0] = idx;
1083 return skb->len;
1084 }
1085
nft_netlink_dump_start_rcu(struct sock * nlsk,struct sk_buff * skb,const struct nlmsghdr * nlh,struct netlink_dump_control * c)1086 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1087 const struct nlmsghdr *nlh,
1088 struct netlink_dump_control *c)
1089 {
1090 int err;
1091
1092 if (!try_module_get(THIS_MODULE))
1093 return -EINVAL;
1094
1095 rcu_read_unlock();
1096 err = netlink_dump_start(nlsk, skb, nlh, c);
1097 rcu_read_lock();
1098 module_put(THIS_MODULE);
1099
1100 return err;
1101 }
1102
1103 /* called with rcu_read_lock held */
nf_tables_gettable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1104 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1105 const struct nlattr * const nla[])
1106 {
1107 struct netlink_ext_ack *extack = info->extack;
1108 u8 genmask = nft_genmask_cur(info->net);
1109 u8 family = info->nfmsg->nfgen_family;
1110 const struct nft_table *table;
1111 struct net *net = info->net;
1112 struct sk_buff *skb2;
1113 int err;
1114
1115 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1116 struct netlink_dump_control c = {
1117 .dump = nf_tables_dump_tables,
1118 .module = THIS_MODULE,
1119 };
1120
1121 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1122 }
1123
1124 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1125 if (IS_ERR(table)) {
1126 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1127 return PTR_ERR(table);
1128 }
1129
1130 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1131 if (!skb2)
1132 return -ENOMEM;
1133
1134 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1135 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1136 0, family, table);
1137 if (err < 0)
1138 goto err_fill_table_info;
1139
1140 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1141
1142 err_fill_table_info:
1143 kfree_skb(skb2);
1144 return err;
1145 }
1146
nft_table_disable(struct net * net,struct nft_table * table,u32 cnt)1147 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1148 {
1149 struct nft_chain *chain;
1150 u32 i = 0;
1151
1152 list_for_each_entry(chain, &table->chains, list) {
1153 if (!nft_is_active_next(net, chain))
1154 continue;
1155 if (!nft_is_base_chain(chain))
1156 continue;
1157
1158 if (cnt && i++ == cnt)
1159 break;
1160
1161 nf_tables_unregister_hook(net, table, chain);
1162 }
1163 }
1164
nf_tables_table_enable(struct net * net,struct nft_table * table)1165 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1166 {
1167 struct nft_chain *chain;
1168 int err, i = 0;
1169
1170 list_for_each_entry(chain, &table->chains, list) {
1171 if (!nft_is_active_next(net, chain))
1172 continue;
1173 if (!nft_is_base_chain(chain))
1174 continue;
1175
1176 err = nf_tables_register_hook(net, table, chain);
1177 if (err < 0)
1178 goto err_register_hooks;
1179
1180 i++;
1181 }
1182 return 0;
1183
1184 err_register_hooks:
1185 if (i)
1186 nft_table_disable(net, table, i);
1187 return err;
1188 }
1189
nf_tables_table_disable(struct net * net,struct nft_table * table)1190 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1191 {
1192 table->flags &= ~NFT_TABLE_F_DORMANT;
1193 nft_table_disable(net, table, 0);
1194 table->flags |= NFT_TABLE_F_DORMANT;
1195 }
1196
1197 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1198 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1199 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1200 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1201 __NFT_TABLE_F_WAS_AWAKEN)
1202
nft_table_pending_update(const struct nft_ctx * ctx)1203 static bool nft_table_pending_update(const struct nft_ctx *ctx)
1204 {
1205 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1206 struct nft_trans *trans;
1207
1208 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1209 return true;
1210
1211 list_for_each_entry(trans, &nft_net->commit_list, list) {
1212 if (trans->ctx.table == ctx->table &&
1213 ((trans->msg_type == NFT_MSG_NEWCHAIN &&
1214 nft_trans_chain_update(trans)) ||
1215 (trans->msg_type == NFT_MSG_DELCHAIN &&
1216 nft_is_base_chain(trans->ctx.chain))))
1217 return true;
1218 }
1219
1220 return false;
1221 }
1222
nf_tables_updtable(struct nft_ctx * ctx)1223 static int nf_tables_updtable(struct nft_ctx *ctx)
1224 {
1225 struct nft_trans *trans;
1226 u32 flags;
1227 int ret;
1228
1229 if (!ctx->nla[NFTA_TABLE_FLAGS])
1230 return 0;
1231
1232 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1233 if (flags & ~NFT_TABLE_F_MASK)
1234 return -EOPNOTSUPP;
1235
1236 if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1237 return 0;
1238
1239 if ((nft_table_has_owner(ctx->table) &&
1240 !(flags & NFT_TABLE_F_OWNER)) ||
1241 (!nft_table_has_owner(ctx->table) &&
1242 flags & NFT_TABLE_F_OWNER))
1243 return -EOPNOTSUPP;
1244
1245 /* No dormant off/on/off/on games in single transaction */
1246 if (nft_table_pending_update(ctx))
1247 return -EINVAL;
1248
1249 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1250 sizeof(struct nft_trans_table));
1251 if (trans == NULL)
1252 return -ENOMEM;
1253
1254 if ((flags & NFT_TABLE_F_DORMANT) &&
1255 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1256 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1257 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1258 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1259 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1260 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1261 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1262 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1263 ret = nf_tables_table_enable(ctx->net, ctx->table);
1264 if (ret < 0)
1265 goto err_register_hooks;
1266
1267 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1268 }
1269 }
1270
1271 nft_trans_table_update(trans) = true;
1272 nft_trans_commit_list_add_tail(ctx->net, trans);
1273
1274 return 0;
1275
1276 err_register_hooks:
1277 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1278 nft_trans_destroy(trans);
1279 return ret;
1280 }
1281
nft_chain_hash(const void * data,u32 len,u32 seed)1282 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1283 {
1284 const char *name = data;
1285
1286 return jhash(name, strlen(name), seed);
1287 }
1288
nft_chain_hash_obj(const void * data,u32 len,u32 seed)1289 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1290 {
1291 const struct nft_chain *chain = data;
1292
1293 return nft_chain_hash(chain->name, 0, seed);
1294 }
1295
nft_chain_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1296 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1297 const void *ptr)
1298 {
1299 const struct nft_chain *chain = ptr;
1300 const char *name = arg->key;
1301
1302 return strcmp(chain->name, name);
1303 }
1304
nft_objname_hash(const void * data,u32 len,u32 seed)1305 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1306 {
1307 const struct nft_object_hash_key *k = data;
1308
1309 seed ^= hash_ptr(k->table, 32);
1310
1311 return jhash(k->name, strlen(k->name), seed);
1312 }
1313
nft_objname_hash_obj(const void * data,u32 len,u32 seed)1314 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1315 {
1316 const struct nft_object *obj = data;
1317
1318 return nft_objname_hash(&obj->key, 0, seed);
1319 }
1320
nft_objname_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1321 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1322 const void *ptr)
1323 {
1324 const struct nft_object_hash_key *k = arg->key;
1325 const struct nft_object *obj = ptr;
1326
1327 if (obj->key.table != k->table)
1328 return -1;
1329
1330 return strcmp(obj->key.name, k->name);
1331 }
1332
nft_supported_family(u8 family)1333 static bool nft_supported_family(u8 family)
1334 {
1335 return false
1336 #ifdef CONFIG_NF_TABLES_INET
1337 || family == NFPROTO_INET
1338 #endif
1339 #ifdef CONFIG_NF_TABLES_IPV4
1340 || family == NFPROTO_IPV4
1341 #endif
1342 #ifdef CONFIG_NF_TABLES_ARP
1343 || family == NFPROTO_ARP
1344 #endif
1345 #ifdef CONFIG_NF_TABLES_NETDEV
1346 || family == NFPROTO_NETDEV
1347 #endif
1348 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1349 || family == NFPROTO_BRIDGE
1350 #endif
1351 #ifdef CONFIG_NF_TABLES_IPV6
1352 || family == NFPROTO_IPV6
1353 #endif
1354 ;
1355 }
1356
nf_tables_newtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1357 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1358 const struct nlattr * const nla[])
1359 {
1360 struct nftables_pernet *nft_net = nft_pernet(info->net);
1361 struct netlink_ext_ack *extack = info->extack;
1362 u8 genmask = nft_genmask_next(info->net);
1363 u8 family = info->nfmsg->nfgen_family;
1364 struct net *net = info->net;
1365 const struct nlattr *attr;
1366 struct nft_table *table;
1367 struct nft_ctx ctx;
1368 u32 flags = 0;
1369 int err;
1370
1371 if (!nft_supported_family(family))
1372 return -EOPNOTSUPP;
1373
1374 lockdep_assert_held(&nft_net->commit_mutex);
1375 attr = nla[NFTA_TABLE_NAME];
1376 table = nft_table_lookup(net, attr, family, genmask,
1377 NETLINK_CB(skb).portid);
1378 if (IS_ERR(table)) {
1379 if (PTR_ERR(table) != -ENOENT)
1380 return PTR_ERR(table);
1381 } else {
1382 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1383 NL_SET_BAD_ATTR(extack, attr);
1384 return -EEXIST;
1385 }
1386 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1387 return -EOPNOTSUPP;
1388
1389 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1390
1391 return nf_tables_updtable(&ctx);
1392 }
1393
1394 if (nla[NFTA_TABLE_FLAGS]) {
1395 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1396 if (flags & ~NFT_TABLE_F_MASK)
1397 return -EOPNOTSUPP;
1398 }
1399
1400 err = -ENOMEM;
1401 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1402 if (table == NULL)
1403 goto err_kzalloc;
1404
1405 table->validate_state = nft_net->validate_state;
1406 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1407 if (table->name == NULL)
1408 goto err_strdup;
1409
1410 if (nla[NFTA_TABLE_USERDATA]) {
1411 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1412 if (table->udata == NULL)
1413 goto err_table_udata;
1414
1415 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1416 }
1417
1418 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1419 if (err)
1420 goto err_chain_ht;
1421
1422 INIT_LIST_HEAD(&table->chains);
1423 INIT_LIST_HEAD(&table->sets);
1424 INIT_LIST_HEAD(&table->objects);
1425 INIT_LIST_HEAD(&table->flowtables);
1426 table->family = family;
1427 table->flags = flags;
1428 table->handle = ++nft_net->table_handle;
1429 if (table->flags & NFT_TABLE_F_OWNER)
1430 table->nlpid = NETLINK_CB(skb).portid;
1431
1432 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1433 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1434 if (err < 0)
1435 goto err_trans;
1436
1437 list_add_tail_rcu(&table->list, &nft_net->tables);
1438 return 0;
1439 err_trans:
1440 rhltable_destroy(&table->chains_ht);
1441 err_chain_ht:
1442 kfree(table->udata);
1443 err_table_udata:
1444 kfree(table->name);
1445 err_strdup:
1446 kfree(table);
1447 err_kzalloc:
1448 return err;
1449 }
1450
nft_flush_table(struct nft_ctx * ctx)1451 static int nft_flush_table(struct nft_ctx *ctx)
1452 {
1453 struct nft_flowtable *flowtable, *nft;
1454 struct nft_chain *chain, *nc;
1455 struct nft_object *obj, *ne;
1456 struct nft_set *set, *ns;
1457 int err;
1458
1459 list_for_each_entry(chain, &ctx->table->chains, list) {
1460 if (!nft_is_active_next(ctx->net, chain))
1461 continue;
1462
1463 if (nft_chain_binding(chain))
1464 continue;
1465
1466 ctx->chain = chain;
1467
1468 err = nft_delrule_by_chain(ctx);
1469 if (err < 0)
1470 goto out;
1471 }
1472
1473 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1474 if (!nft_is_active_next(ctx->net, set))
1475 continue;
1476
1477 if (nft_set_is_anonymous(set))
1478 continue;
1479
1480 err = nft_delset(ctx, set);
1481 if (err < 0)
1482 goto out;
1483 }
1484
1485 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1486 if (!nft_is_active_next(ctx->net, flowtable))
1487 continue;
1488
1489 err = nft_delflowtable(ctx, flowtable);
1490 if (err < 0)
1491 goto out;
1492 }
1493
1494 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1495 if (!nft_is_active_next(ctx->net, obj))
1496 continue;
1497
1498 err = nft_delobj(ctx, obj);
1499 if (err < 0)
1500 goto out;
1501 }
1502
1503 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1504 if (!nft_is_active_next(ctx->net, chain))
1505 continue;
1506
1507 if (nft_chain_binding(chain))
1508 continue;
1509
1510 ctx->chain = chain;
1511
1512 err = nft_delchain(ctx);
1513 if (err < 0)
1514 goto out;
1515 }
1516
1517 err = nft_deltable(ctx);
1518 out:
1519 return err;
1520 }
1521
nft_flush(struct nft_ctx * ctx,int family)1522 static int nft_flush(struct nft_ctx *ctx, int family)
1523 {
1524 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1525 const struct nlattr * const *nla = ctx->nla;
1526 struct nft_table *table, *nt;
1527 int err = 0;
1528
1529 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1530 if (family != AF_UNSPEC && table->family != family)
1531 continue;
1532
1533 ctx->family = table->family;
1534
1535 if (!nft_is_active_next(ctx->net, table))
1536 continue;
1537
1538 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1539 continue;
1540
1541 if (nla[NFTA_TABLE_NAME] &&
1542 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1543 continue;
1544
1545 ctx->table = table;
1546
1547 err = nft_flush_table(ctx);
1548 if (err < 0)
1549 goto out;
1550 }
1551 out:
1552 return err;
1553 }
1554
nf_tables_deltable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1555 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1556 const struct nlattr * const nla[])
1557 {
1558 struct netlink_ext_ack *extack = info->extack;
1559 u8 genmask = nft_genmask_next(info->net);
1560 u8 family = info->nfmsg->nfgen_family;
1561 struct net *net = info->net;
1562 const struct nlattr *attr;
1563 struct nft_table *table;
1564 struct nft_ctx ctx;
1565
1566 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1567 if (family == AF_UNSPEC ||
1568 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1569 return nft_flush(&ctx, family);
1570
1571 if (nla[NFTA_TABLE_HANDLE]) {
1572 attr = nla[NFTA_TABLE_HANDLE];
1573 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1574 NETLINK_CB(skb).portid);
1575 } else {
1576 attr = nla[NFTA_TABLE_NAME];
1577 table = nft_table_lookup(net, attr, family, genmask,
1578 NETLINK_CB(skb).portid);
1579 }
1580
1581 if (IS_ERR(table)) {
1582 if (PTR_ERR(table) == -ENOENT &&
1583 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1584 return 0;
1585
1586 NL_SET_BAD_ATTR(extack, attr);
1587 return PTR_ERR(table);
1588 }
1589
1590 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1591 table->use > 0)
1592 return -EBUSY;
1593
1594 ctx.family = family;
1595 ctx.table = table;
1596
1597 return nft_flush_table(&ctx);
1598 }
1599
nf_tables_table_destroy(struct nft_ctx * ctx)1600 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1601 {
1602 if (WARN_ON(ctx->table->use > 0))
1603 return;
1604
1605 rhltable_destroy(&ctx->table->chains_ht);
1606 kfree(ctx->table->name);
1607 kfree(ctx->table->udata);
1608 kfree(ctx->table);
1609 }
1610
nft_register_chain_type(const struct nft_chain_type * ctype)1611 void nft_register_chain_type(const struct nft_chain_type *ctype)
1612 {
1613 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1614 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1615 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1616 return;
1617 }
1618 chain_type[ctype->family][ctype->type] = ctype;
1619 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1620 }
1621 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1622
nft_unregister_chain_type(const struct nft_chain_type * ctype)1623 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1624 {
1625 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1626 chain_type[ctype->family][ctype->type] = NULL;
1627 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1628 }
1629 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1630
1631 /*
1632 * Chains
1633 */
1634
1635 static struct nft_chain *
nft_chain_lookup_byhandle(const struct nft_table * table,u64 handle,u8 genmask)1636 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1637 {
1638 struct nft_chain *chain;
1639
1640 list_for_each_entry(chain, &table->chains, list) {
1641 if (chain->handle == handle &&
1642 nft_active_genmask(chain, genmask))
1643 return chain;
1644 }
1645
1646 return ERR_PTR(-ENOENT);
1647 }
1648
lockdep_commit_lock_is_held(const struct net * net)1649 static bool lockdep_commit_lock_is_held(const struct net *net)
1650 {
1651 #ifdef CONFIG_PROVE_LOCKING
1652 struct nftables_pernet *nft_net = nft_pernet(net);
1653
1654 return lockdep_is_held(&nft_net->commit_mutex);
1655 #else
1656 return true;
1657 #endif
1658 }
1659
nft_chain_lookup(struct net * net,struct nft_table * table,const struct nlattr * nla,u8 genmask)1660 static struct nft_chain *nft_chain_lookup(struct net *net,
1661 struct nft_table *table,
1662 const struct nlattr *nla, u8 genmask)
1663 {
1664 char search[NFT_CHAIN_MAXNAMELEN + 1];
1665 struct rhlist_head *tmp, *list;
1666 struct nft_chain *chain;
1667
1668 if (nla == NULL)
1669 return ERR_PTR(-EINVAL);
1670
1671 nla_strscpy(search, nla, sizeof(search));
1672
1673 WARN_ON(!rcu_read_lock_held() &&
1674 !lockdep_commit_lock_is_held(net));
1675
1676 chain = ERR_PTR(-ENOENT);
1677 rcu_read_lock();
1678 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1679 if (!list)
1680 goto out_unlock;
1681
1682 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1683 if (nft_active_genmask(chain, genmask))
1684 goto out_unlock;
1685 }
1686 chain = ERR_PTR(-ENOENT);
1687 out_unlock:
1688 rcu_read_unlock();
1689 return chain;
1690 }
1691
1692 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1693 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1694 .len = NFT_TABLE_MAXNAMELEN - 1 },
1695 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1696 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1697 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1698 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1699 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1700 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1701 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1702 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1703 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1704 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1705 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1706 .len = NFT_USERDATA_MAXLEN },
1707 };
1708
1709 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1710 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1711 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1712 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1713 .len = IFNAMSIZ - 1 },
1714 };
1715
nft_dump_stats(struct sk_buff * skb,struct nft_stats __percpu * stats)1716 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1717 {
1718 struct nft_stats *cpu_stats, total;
1719 struct nlattr *nest;
1720 unsigned int seq;
1721 u64 pkts, bytes;
1722 int cpu;
1723
1724 if (!stats)
1725 return 0;
1726
1727 memset(&total, 0, sizeof(total));
1728 for_each_possible_cpu(cpu) {
1729 cpu_stats = per_cpu_ptr(stats, cpu);
1730 do {
1731 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1732 pkts = cpu_stats->pkts;
1733 bytes = cpu_stats->bytes;
1734 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1735 total.pkts += pkts;
1736 total.bytes += bytes;
1737 }
1738 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1739 if (nest == NULL)
1740 goto nla_put_failure;
1741
1742 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1743 NFTA_COUNTER_PAD) ||
1744 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1745 NFTA_COUNTER_PAD))
1746 goto nla_put_failure;
1747
1748 nla_nest_end(skb, nest);
1749 return 0;
1750
1751 nla_put_failure:
1752 return -ENOSPC;
1753 }
1754
nft_dump_basechain_hook(struct sk_buff * skb,int family,const struct nft_base_chain * basechain,const struct list_head * hook_list)1755 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1756 const struct nft_base_chain *basechain,
1757 const struct list_head *hook_list)
1758 {
1759 const struct nf_hook_ops *ops = &basechain->ops;
1760 struct nft_hook *hook, *first = NULL;
1761 struct nlattr *nest, *nest_devs;
1762 int n = 0;
1763
1764 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1765 if (nest == NULL)
1766 goto nla_put_failure;
1767 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1768 goto nla_put_failure;
1769 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1770 goto nla_put_failure;
1771
1772 if (nft_base_chain_netdev(family, ops->hooknum)) {
1773 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1774 if (!nest_devs)
1775 goto nla_put_failure;
1776
1777 if (!hook_list)
1778 hook_list = &basechain->hook_list;
1779
1780 list_for_each_entry(hook, hook_list, list) {
1781 if (!first)
1782 first = hook;
1783
1784 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1785 hook->ops.dev->name))
1786 goto nla_put_failure;
1787 n++;
1788 }
1789 nla_nest_end(skb, nest_devs);
1790
1791 if (n == 1 &&
1792 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1793 goto nla_put_failure;
1794 }
1795 nla_nest_end(skb, nest);
1796
1797 return 0;
1798 nla_put_failure:
1799 return -1;
1800 }
1801
nf_tables_fill_chain_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,const struct nft_chain * chain,const struct list_head * hook_list)1802 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1803 u32 portid, u32 seq, int event, u32 flags,
1804 int family, const struct nft_table *table,
1805 const struct nft_chain *chain,
1806 const struct list_head *hook_list)
1807 {
1808 struct nlmsghdr *nlh;
1809
1810 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1811 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1812 NFNETLINK_V0, nft_base_seq(net));
1813 if (!nlh)
1814 goto nla_put_failure;
1815
1816 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1817 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1818 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1819 NFTA_CHAIN_PAD))
1820 goto nla_put_failure;
1821
1822 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1823 nlmsg_end(skb, nlh);
1824 return 0;
1825 }
1826
1827 if (nft_is_base_chain(chain)) {
1828 const struct nft_base_chain *basechain = nft_base_chain(chain);
1829 struct nft_stats __percpu *stats;
1830
1831 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1832 goto nla_put_failure;
1833
1834 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1835 htonl(basechain->policy)))
1836 goto nla_put_failure;
1837
1838 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1839 goto nla_put_failure;
1840
1841 stats = rcu_dereference_check(basechain->stats,
1842 lockdep_commit_lock_is_held(net));
1843 if (nft_dump_stats(skb, stats))
1844 goto nla_put_failure;
1845 }
1846
1847 if (chain->flags &&
1848 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1849 goto nla_put_failure;
1850
1851 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1852 goto nla_put_failure;
1853
1854 if (chain->udata &&
1855 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1856 goto nla_put_failure;
1857
1858 nlmsg_end(skb, nlh);
1859 return 0;
1860
1861 nla_put_failure:
1862 nlmsg_trim(skb, nlh);
1863 return -1;
1864 }
1865
nf_tables_chain_notify(const struct nft_ctx * ctx,int event,const struct list_head * hook_list)1866 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1867 const struct list_head *hook_list)
1868 {
1869 struct nftables_pernet *nft_net;
1870 struct sk_buff *skb;
1871 u16 flags = 0;
1872 int err;
1873
1874 if (!ctx->report &&
1875 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1876 return;
1877
1878 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1879 if (skb == NULL)
1880 goto err;
1881
1882 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1883 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1884
1885 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1886 event, flags, ctx->family, ctx->table,
1887 ctx->chain, hook_list);
1888 if (err < 0) {
1889 kfree_skb(skb);
1890 goto err;
1891 }
1892
1893 nft_net = nft_pernet(ctx->net);
1894 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1895 return;
1896 err:
1897 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1898 }
1899
nf_tables_dump_chains(struct sk_buff * skb,struct netlink_callback * cb)1900 static int nf_tables_dump_chains(struct sk_buff *skb,
1901 struct netlink_callback *cb)
1902 {
1903 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1904 unsigned int idx = 0, s_idx = cb->args[0];
1905 struct net *net = sock_net(skb->sk);
1906 int family = nfmsg->nfgen_family;
1907 struct nftables_pernet *nft_net;
1908 const struct nft_table *table;
1909 const struct nft_chain *chain;
1910
1911 rcu_read_lock();
1912 nft_net = nft_pernet(net);
1913 cb->seq = READ_ONCE(nft_net->base_seq);
1914
1915 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1916 if (family != NFPROTO_UNSPEC && family != table->family)
1917 continue;
1918
1919 list_for_each_entry_rcu(chain, &table->chains, list) {
1920 if (idx < s_idx)
1921 goto cont;
1922 if (idx > s_idx)
1923 memset(&cb->args[1], 0,
1924 sizeof(cb->args) - sizeof(cb->args[0]));
1925 if (!nft_is_active(net, chain))
1926 continue;
1927 if (nf_tables_fill_chain_info(skb, net,
1928 NETLINK_CB(cb->skb).portid,
1929 cb->nlh->nlmsg_seq,
1930 NFT_MSG_NEWCHAIN,
1931 NLM_F_MULTI,
1932 table->family, table,
1933 chain, NULL) < 0)
1934 goto done;
1935
1936 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1937 cont:
1938 idx++;
1939 }
1940 }
1941 done:
1942 rcu_read_unlock();
1943 cb->args[0] = idx;
1944 return skb->len;
1945 }
1946
1947 /* called with rcu_read_lock held */
nf_tables_getchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1948 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1949 const struct nlattr * const nla[])
1950 {
1951 struct netlink_ext_ack *extack = info->extack;
1952 u8 genmask = nft_genmask_cur(info->net);
1953 u8 family = info->nfmsg->nfgen_family;
1954 const struct nft_chain *chain;
1955 struct net *net = info->net;
1956 struct nft_table *table;
1957 struct sk_buff *skb2;
1958 int err;
1959
1960 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1961 struct netlink_dump_control c = {
1962 .dump = nf_tables_dump_chains,
1963 .module = THIS_MODULE,
1964 };
1965
1966 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1967 }
1968
1969 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1970 if (IS_ERR(table)) {
1971 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1972 return PTR_ERR(table);
1973 }
1974
1975 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1976 if (IS_ERR(chain)) {
1977 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1978 return PTR_ERR(chain);
1979 }
1980
1981 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1982 if (!skb2)
1983 return -ENOMEM;
1984
1985 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1986 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1987 0, family, table, chain, NULL);
1988 if (err < 0)
1989 goto err_fill_chain_info;
1990
1991 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1992
1993 err_fill_chain_info:
1994 kfree_skb(skb2);
1995 return err;
1996 }
1997
1998 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1999 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
2000 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
2001 };
2002
nft_stats_alloc(const struct nlattr * attr)2003 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
2004 {
2005 struct nlattr *tb[NFTA_COUNTER_MAX+1];
2006 struct nft_stats __percpu *newstats;
2007 struct nft_stats *stats;
2008 int err;
2009
2010 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2011 nft_counter_policy, NULL);
2012 if (err < 0)
2013 return ERR_PTR(err);
2014
2015 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2016 return ERR_PTR(-EINVAL);
2017
2018 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2019 if (newstats == NULL)
2020 return ERR_PTR(-ENOMEM);
2021
2022 /* Restore old counters on this cpu, no problem. Per-cpu statistics
2023 * are not exposed to userspace.
2024 */
2025 preempt_disable();
2026 stats = this_cpu_ptr(newstats);
2027 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2028 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2029 preempt_enable();
2030
2031 return newstats;
2032 }
2033
nft_chain_stats_replace(struct nft_trans * trans)2034 static void nft_chain_stats_replace(struct nft_trans *trans)
2035 {
2036 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2037
2038 if (!nft_trans_chain_stats(trans))
2039 return;
2040
2041 nft_trans_chain_stats(trans) =
2042 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2043 lockdep_commit_lock_is_held(trans->ctx.net));
2044
2045 if (!nft_trans_chain_stats(trans))
2046 static_branch_inc(&nft_counters_enabled);
2047 }
2048
nf_tables_chain_free_chain_rules(struct nft_chain * chain)2049 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2050 {
2051 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2052 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2053
2054 if (g0 != g1)
2055 kvfree(g1);
2056 kvfree(g0);
2057
2058 /* should be NULL either via abort or via successful commit */
2059 WARN_ON_ONCE(chain->blob_next);
2060 kvfree(chain->blob_next);
2061 }
2062
nf_tables_chain_destroy(struct nft_ctx * ctx)2063 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2064 {
2065 struct nft_chain *chain = ctx->chain;
2066 struct nft_hook *hook, *next;
2067
2068 if (WARN_ON(chain->use > 0))
2069 return;
2070
2071 /* no concurrent access possible anymore */
2072 nf_tables_chain_free_chain_rules(chain);
2073
2074 if (nft_is_base_chain(chain)) {
2075 struct nft_base_chain *basechain = nft_base_chain(chain);
2076
2077 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2078 list_for_each_entry_safe(hook, next,
2079 &basechain->hook_list, list) {
2080 list_del_rcu(&hook->list);
2081 kfree_rcu(hook, rcu);
2082 }
2083 }
2084 module_put(basechain->type->owner);
2085 if (rcu_access_pointer(basechain->stats)) {
2086 static_branch_dec(&nft_counters_enabled);
2087 free_percpu(rcu_dereference_raw(basechain->stats));
2088 }
2089 kfree(chain->name);
2090 kfree(chain->udata);
2091 kfree(basechain);
2092 } else {
2093 kfree(chain->name);
2094 kfree(chain->udata);
2095 kfree(chain);
2096 }
2097 }
2098
nft_netdev_hook_alloc(struct net * net,const struct nlattr * attr)2099 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2100 const struct nlattr *attr)
2101 {
2102 struct net_device *dev;
2103 char ifname[IFNAMSIZ];
2104 struct nft_hook *hook;
2105 int err;
2106
2107 hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2108 if (!hook) {
2109 err = -ENOMEM;
2110 goto err_hook_alloc;
2111 }
2112
2113 nla_strscpy(ifname, attr, IFNAMSIZ);
2114 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2115 * indirectly serializing all the other holders of the commit_mutex with
2116 * the rtnl_mutex.
2117 */
2118 dev = __dev_get_by_name(net, ifname);
2119 if (!dev) {
2120 err = -ENOENT;
2121 goto err_hook_dev;
2122 }
2123 hook->ops.dev = dev;
2124
2125 return hook;
2126
2127 err_hook_dev:
2128 kfree(hook);
2129 err_hook_alloc:
2130 return ERR_PTR(err);
2131 }
2132
nft_hook_list_find(struct list_head * hook_list,const struct nft_hook * this)2133 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2134 const struct nft_hook *this)
2135 {
2136 struct nft_hook *hook;
2137
2138 list_for_each_entry(hook, hook_list, list) {
2139 if (this->ops.dev == hook->ops.dev)
2140 return hook;
2141 }
2142
2143 return NULL;
2144 }
2145
nf_tables_parse_netdev_hooks(struct net * net,const struct nlattr * attr,struct list_head * hook_list,struct netlink_ext_ack * extack)2146 static int nf_tables_parse_netdev_hooks(struct net *net,
2147 const struct nlattr *attr,
2148 struct list_head *hook_list,
2149 struct netlink_ext_ack *extack)
2150 {
2151 struct nft_hook *hook, *next;
2152 const struct nlattr *tmp;
2153 int rem, n = 0, err;
2154
2155 nla_for_each_nested(tmp, attr, rem) {
2156 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2157 err = -EINVAL;
2158 goto err_hook;
2159 }
2160
2161 hook = nft_netdev_hook_alloc(net, tmp);
2162 if (IS_ERR(hook)) {
2163 NL_SET_BAD_ATTR(extack, tmp);
2164 err = PTR_ERR(hook);
2165 goto err_hook;
2166 }
2167 if (nft_hook_list_find(hook_list, hook)) {
2168 NL_SET_BAD_ATTR(extack, tmp);
2169 kfree(hook);
2170 err = -EEXIST;
2171 goto err_hook;
2172 }
2173 list_add_tail(&hook->list, hook_list);
2174 n++;
2175
2176 if (n == NFT_NETDEVICE_MAX) {
2177 err = -EFBIG;
2178 goto err_hook;
2179 }
2180 }
2181
2182 return 0;
2183
2184 err_hook:
2185 list_for_each_entry_safe(hook, next, hook_list, list) {
2186 list_del(&hook->list);
2187 kfree(hook);
2188 }
2189 return err;
2190 }
2191
2192 struct nft_chain_hook {
2193 u32 num;
2194 s32 priority;
2195 const struct nft_chain_type *type;
2196 struct list_head list;
2197 };
2198
nft_chain_parse_netdev(struct net * net,struct nlattr * tb[],struct list_head * hook_list,struct netlink_ext_ack * extack,u32 flags)2199 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2200 struct list_head *hook_list,
2201 struct netlink_ext_ack *extack, u32 flags)
2202 {
2203 struct nft_hook *hook;
2204 int err;
2205
2206 if (tb[NFTA_HOOK_DEV]) {
2207 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2208 if (IS_ERR(hook)) {
2209 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2210 return PTR_ERR(hook);
2211 }
2212
2213 list_add_tail(&hook->list, hook_list);
2214 } else if (tb[NFTA_HOOK_DEVS]) {
2215 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2216 hook_list, extack);
2217 if (err < 0)
2218 return err;
2219
2220 }
2221
2222 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2223 list_empty(hook_list))
2224 return -EINVAL;
2225
2226 return 0;
2227 }
2228
nft_chain_parse_hook(struct net * net,struct nft_base_chain * basechain,const struct nlattr * const nla[],struct nft_chain_hook * hook,u8 family,u32 flags,struct netlink_ext_ack * extack)2229 static int nft_chain_parse_hook(struct net *net,
2230 struct nft_base_chain *basechain,
2231 const struct nlattr * const nla[],
2232 struct nft_chain_hook *hook, u8 family,
2233 u32 flags, struct netlink_ext_ack *extack)
2234 {
2235 struct nftables_pernet *nft_net = nft_pernet(net);
2236 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2237 const struct nft_chain_type *type;
2238 int err;
2239
2240 lockdep_assert_held(&nft_net->commit_mutex);
2241 lockdep_nfnl_nft_mutex_not_held();
2242
2243 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2244 nla[NFTA_CHAIN_HOOK],
2245 nft_hook_policy, NULL);
2246 if (err < 0)
2247 return err;
2248
2249 if (!basechain) {
2250 if (!ha[NFTA_HOOK_HOOKNUM] ||
2251 !ha[NFTA_HOOK_PRIORITY]) {
2252 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2253 return -ENOENT;
2254 }
2255
2256 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2257 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2258
2259 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2260 if (!type)
2261 return -EOPNOTSUPP;
2262
2263 if (nla[NFTA_CHAIN_TYPE]) {
2264 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2265 family, true);
2266 if (IS_ERR(type)) {
2267 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2268 return PTR_ERR(type);
2269 }
2270 }
2271 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2272 return -EOPNOTSUPP;
2273
2274 if (type->type == NFT_CHAIN_T_NAT &&
2275 hook->priority <= NF_IP_PRI_CONNTRACK)
2276 return -EOPNOTSUPP;
2277 } else {
2278 if (ha[NFTA_HOOK_HOOKNUM]) {
2279 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2280 if (hook->num != basechain->ops.hooknum)
2281 return -EOPNOTSUPP;
2282 }
2283 if (ha[NFTA_HOOK_PRIORITY]) {
2284 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2285 if (hook->priority != basechain->ops.priority)
2286 return -EOPNOTSUPP;
2287 }
2288
2289 if (nla[NFTA_CHAIN_TYPE]) {
2290 type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2291 family);
2292 if (!type) {
2293 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2294 return -ENOENT;
2295 }
2296 } else {
2297 type = basechain->type;
2298 }
2299 }
2300
2301 if (!try_module_get(type->owner)) {
2302 if (nla[NFTA_CHAIN_TYPE])
2303 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2304 return -ENOENT;
2305 }
2306
2307 hook->type = type;
2308
2309 INIT_LIST_HEAD(&hook->list);
2310 if (nft_base_chain_netdev(family, hook->num)) {
2311 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2312 if (err < 0) {
2313 module_put(type->owner);
2314 return err;
2315 }
2316 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2317 module_put(type->owner);
2318 return -EOPNOTSUPP;
2319 }
2320
2321 return 0;
2322 }
2323
nft_chain_release_hook(struct nft_chain_hook * hook)2324 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2325 {
2326 struct nft_hook *h, *next;
2327
2328 list_for_each_entry_safe(h, next, &hook->list, list) {
2329 list_del(&h->list);
2330 kfree(h);
2331 }
2332 module_put(hook->type->owner);
2333 }
2334
nft_last_rule(const struct nft_chain * chain,const void * ptr)2335 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2336 {
2337 struct nft_rule_dp_last *lrule;
2338
2339 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2340
2341 lrule = (struct nft_rule_dp_last *)ptr;
2342 lrule->end.is_last = 1;
2343 lrule->chain = chain;
2344 /* blob size does not include the trailer rule */
2345 }
2346
nf_tables_chain_alloc_rules(const struct nft_chain * chain,unsigned int size)2347 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2348 unsigned int size)
2349 {
2350 struct nft_rule_blob *blob;
2351
2352 if (size > INT_MAX)
2353 return NULL;
2354
2355 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2356
2357 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2358 if (!blob)
2359 return NULL;
2360
2361 blob->size = 0;
2362 nft_last_rule(chain, blob->data);
2363
2364 return blob;
2365 }
2366
nft_basechain_hook_init(struct nf_hook_ops * ops,u8 family,const struct nft_chain_hook * hook,struct nft_chain * chain)2367 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2368 const struct nft_chain_hook *hook,
2369 struct nft_chain *chain)
2370 {
2371 ops->pf = family;
2372 ops->hooknum = hook->num;
2373 ops->priority = hook->priority;
2374 ops->priv = chain;
2375 ops->hook = hook->type->hooks[ops->hooknum];
2376 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2377 }
2378
nft_basechain_init(struct nft_base_chain * basechain,u8 family,struct nft_chain_hook * hook,u32 flags)2379 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2380 struct nft_chain_hook *hook, u32 flags)
2381 {
2382 struct nft_chain *chain;
2383 struct nft_hook *h;
2384
2385 basechain->type = hook->type;
2386 INIT_LIST_HEAD(&basechain->hook_list);
2387 chain = &basechain->chain;
2388
2389 if (nft_base_chain_netdev(family, hook->num)) {
2390 list_splice_init(&hook->list, &basechain->hook_list);
2391 list_for_each_entry(h, &basechain->hook_list, list)
2392 nft_basechain_hook_init(&h->ops, family, hook, chain);
2393 }
2394 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2395
2396 chain->flags |= NFT_CHAIN_BASE | flags;
2397 basechain->policy = NF_ACCEPT;
2398 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2399 !nft_chain_offload_support(basechain)) {
2400 list_splice_init(&basechain->hook_list, &hook->list);
2401 return -EOPNOTSUPP;
2402 }
2403
2404 flow_block_init(&basechain->flow_block);
2405
2406 return 0;
2407 }
2408
nft_chain_add(struct nft_table * table,struct nft_chain * chain)2409 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2410 {
2411 int err;
2412
2413 err = rhltable_insert_key(&table->chains_ht, chain->name,
2414 &chain->rhlhead, nft_chain_ht_params);
2415 if (err)
2416 return err;
2417
2418 list_add_tail_rcu(&chain->list, &table->chains);
2419
2420 return 0;
2421 }
2422
2423 static u64 chain_id;
2424
nf_tables_addchain(struct nft_ctx * ctx,u8 family,u8 genmask,u8 policy,u32 flags,struct netlink_ext_ack * extack)2425 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2426 u8 policy, u32 flags,
2427 struct netlink_ext_ack *extack)
2428 {
2429 const struct nlattr * const *nla = ctx->nla;
2430 struct nft_table *table = ctx->table;
2431 struct nft_base_chain *basechain;
2432 struct net *net = ctx->net;
2433 char name[NFT_NAME_MAXLEN];
2434 struct nft_rule_blob *blob;
2435 struct nft_trans *trans;
2436 struct nft_chain *chain;
2437 int err;
2438
2439 if (nla[NFTA_CHAIN_HOOK]) {
2440 struct nft_stats __percpu *stats = NULL;
2441 struct nft_chain_hook hook = {};
2442
2443 if (table->flags & __NFT_TABLE_F_UPDATE)
2444 return -EINVAL;
2445
2446 if (flags & NFT_CHAIN_BINDING)
2447 return -EOPNOTSUPP;
2448
2449 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2450 extack);
2451 if (err < 0)
2452 return err;
2453
2454 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2455 if (basechain == NULL) {
2456 nft_chain_release_hook(&hook);
2457 return -ENOMEM;
2458 }
2459 chain = &basechain->chain;
2460
2461 if (nla[NFTA_CHAIN_COUNTERS]) {
2462 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2463 if (IS_ERR(stats)) {
2464 nft_chain_release_hook(&hook);
2465 kfree(basechain);
2466 return PTR_ERR(stats);
2467 }
2468 rcu_assign_pointer(basechain->stats, stats);
2469 }
2470
2471 err = nft_basechain_init(basechain, family, &hook, flags);
2472 if (err < 0) {
2473 nft_chain_release_hook(&hook);
2474 kfree(basechain);
2475 free_percpu(stats);
2476 return err;
2477 }
2478 if (stats)
2479 static_branch_inc(&nft_counters_enabled);
2480 } else {
2481 if (flags & NFT_CHAIN_BASE)
2482 return -EINVAL;
2483 if (flags & NFT_CHAIN_HW_OFFLOAD)
2484 return -EOPNOTSUPP;
2485
2486 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2487 if (chain == NULL)
2488 return -ENOMEM;
2489
2490 chain->flags = flags;
2491 }
2492 ctx->chain = chain;
2493
2494 INIT_LIST_HEAD(&chain->rules);
2495 chain->handle = nf_tables_alloc_handle(table);
2496 chain->table = table;
2497
2498 if (nla[NFTA_CHAIN_NAME]) {
2499 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2500 } else {
2501 if (!(flags & NFT_CHAIN_BINDING)) {
2502 err = -EINVAL;
2503 goto err_destroy_chain;
2504 }
2505
2506 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2507 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2508 }
2509
2510 if (!chain->name) {
2511 err = -ENOMEM;
2512 goto err_destroy_chain;
2513 }
2514
2515 if (nla[NFTA_CHAIN_USERDATA]) {
2516 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2517 if (chain->udata == NULL) {
2518 err = -ENOMEM;
2519 goto err_destroy_chain;
2520 }
2521 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2522 }
2523
2524 blob = nf_tables_chain_alloc_rules(chain, 0);
2525 if (!blob) {
2526 err = -ENOMEM;
2527 goto err_destroy_chain;
2528 }
2529
2530 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2531 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2532
2533 if (!nft_use_inc(&table->use)) {
2534 err = -EMFILE;
2535 goto err_destroy_chain;
2536 }
2537
2538 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2539 if (IS_ERR(trans)) {
2540 err = PTR_ERR(trans);
2541 goto err_trans;
2542 }
2543
2544 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2545 if (nft_is_base_chain(chain))
2546 nft_trans_chain_policy(trans) = policy;
2547
2548 err = nft_chain_add(table, chain);
2549 if (err < 0)
2550 goto err_chain_add;
2551
2552 /* This must be LAST to ensure no packets are walking over this chain. */
2553 err = nf_tables_register_hook(net, table, chain);
2554 if (err < 0)
2555 goto err_register_hook;
2556
2557 return 0;
2558
2559 err_register_hook:
2560 nft_chain_del(chain);
2561 err_chain_add:
2562 nft_trans_destroy(trans);
2563 err_trans:
2564 nft_use_dec_restore(&table->use);
2565 err_destroy_chain:
2566 nf_tables_chain_destroy(ctx);
2567
2568 return err;
2569 }
2570
nf_tables_updchain(struct nft_ctx * ctx,u8 genmask,u8 policy,u32 flags,const struct nlattr * attr,struct netlink_ext_ack * extack)2571 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2572 u32 flags, const struct nlattr *attr,
2573 struct netlink_ext_ack *extack)
2574 {
2575 const struct nlattr * const *nla = ctx->nla;
2576 struct nft_base_chain *basechain = NULL;
2577 struct nft_table *table = ctx->table;
2578 struct nft_chain *chain = ctx->chain;
2579 struct nft_chain_hook hook = {};
2580 struct nft_stats *stats = NULL;
2581 struct nft_hook *h, *next;
2582 struct nf_hook_ops *ops;
2583 struct nft_trans *trans;
2584 bool unregister = false;
2585 int err;
2586
2587 if (chain->flags ^ flags)
2588 return -EOPNOTSUPP;
2589
2590 INIT_LIST_HEAD(&hook.list);
2591
2592 if (nla[NFTA_CHAIN_HOOK]) {
2593 if (!nft_is_base_chain(chain)) {
2594 NL_SET_BAD_ATTR(extack, attr);
2595 return -EEXIST;
2596 }
2597
2598 basechain = nft_base_chain(chain);
2599 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2600 ctx->family, flags, extack);
2601 if (err < 0)
2602 return err;
2603
2604 if (basechain->type != hook.type) {
2605 nft_chain_release_hook(&hook);
2606 NL_SET_BAD_ATTR(extack, attr);
2607 return -EEXIST;
2608 }
2609
2610 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2611 list_for_each_entry_safe(h, next, &hook.list, list) {
2612 h->ops.pf = basechain->ops.pf;
2613 h->ops.hooknum = basechain->ops.hooknum;
2614 h->ops.priority = basechain->ops.priority;
2615 h->ops.priv = basechain->ops.priv;
2616 h->ops.hook = basechain->ops.hook;
2617
2618 if (nft_hook_list_find(&basechain->hook_list, h)) {
2619 list_del(&h->list);
2620 kfree(h);
2621 }
2622 }
2623 } else {
2624 ops = &basechain->ops;
2625 if (ops->hooknum != hook.num ||
2626 ops->priority != hook.priority) {
2627 nft_chain_release_hook(&hook);
2628 NL_SET_BAD_ATTR(extack, attr);
2629 return -EEXIST;
2630 }
2631 }
2632 }
2633
2634 if (nla[NFTA_CHAIN_HANDLE] &&
2635 nla[NFTA_CHAIN_NAME]) {
2636 struct nft_chain *chain2;
2637
2638 chain2 = nft_chain_lookup(ctx->net, table,
2639 nla[NFTA_CHAIN_NAME], genmask);
2640 if (!IS_ERR(chain2)) {
2641 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2642 err = -EEXIST;
2643 goto err_hooks;
2644 }
2645 }
2646
2647 if (table->flags & __NFT_TABLE_F_UPDATE &&
2648 !list_empty(&hook.list)) {
2649 NL_SET_BAD_ATTR(extack, attr);
2650 err = -EOPNOTSUPP;
2651 goto err_hooks;
2652 }
2653
2654 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2655 nft_is_base_chain(chain) &&
2656 !list_empty(&hook.list)) {
2657 basechain = nft_base_chain(chain);
2658 ops = &basechain->ops;
2659
2660 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2661 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2662 if (err < 0)
2663 goto err_hooks;
2664 }
2665 }
2666
2667 unregister = true;
2668
2669 if (nla[NFTA_CHAIN_COUNTERS]) {
2670 if (!nft_is_base_chain(chain)) {
2671 err = -EOPNOTSUPP;
2672 goto err_hooks;
2673 }
2674
2675 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2676 if (IS_ERR(stats)) {
2677 err = PTR_ERR(stats);
2678 goto err_hooks;
2679 }
2680 }
2681
2682 err = -ENOMEM;
2683 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2684 sizeof(struct nft_trans_chain));
2685 if (trans == NULL)
2686 goto err_trans;
2687
2688 nft_trans_chain_stats(trans) = stats;
2689 nft_trans_chain_update(trans) = true;
2690
2691 if (nla[NFTA_CHAIN_POLICY])
2692 nft_trans_chain_policy(trans) = policy;
2693 else
2694 nft_trans_chain_policy(trans) = -1;
2695
2696 if (nla[NFTA_CHAIN_HANDLE] &&
2697 nla[NFTA_CHAIN_NAME]) {
2698 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2699 struct nft_trans *tmp;
2700 char *name;
2701
2702 err = -ENOMEM;
2703 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2704 if (!name)
2705 goto err_trans;
2706
2707 err = -EEXIST;
2708 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2709 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2710 tmp->ctx.table == table &&
2711 nft_trans_chain_update(tmp) &&
2712 nft_trans_chain_name(tmp) &&
2713 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2714 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2715 kfree(name);
2716 goto err_trans;
2717 }
2718 }
2719
2720 nft_trans_chain_name(trans) = name;
2721 }
2722
2723 nft_trans_basechain(trans) = basechain;
2724 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2725 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2726 if (nla[NFTA_CHAIN_HOOK])
2727 module_put(hook.type->owner);
2728
2729 nft_trans_commit_list_add_tail(ctx->net, trans);
2730
2731 return 0;
2732
2733 err_trans:
2734 free_percpu(stats);
2735 kfree(trans);
2736 err_hooks:
2737 if (nla[NFTA_CHAIN_HOOK]) {
2738 list_for_each_entry_safe(h, next, &hook.list, list) {
2739 if (unregister)
2740 nf_unregister_net_hook(ctx->net, &h->ops);
2741 list_del(&h->list);
2742 kfree_rcu(h, rcu);
2743 }
2744 module_put(hook.type->owner);
2745 }
2746
2747 return err;
2748 }
2749
nft_chain_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)2750 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2751 const struct nft_table *table,
2752 const struct nlattr *nla, u8 genmask)
2753 {
2754 struct nftables_pernet *nft_net = nft_pernet(net);
2755 u32 id = ntohl(nla_get_be32(nla));
2756 struct nft_trans *trans;
2757
2758 list_for_each_entry(trans, &nft_net->commit_list, list) {
2759 struct nft_chain *chain = trans->ctx.chain;
2760
2761 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2762 chain->table == table &&
2763 id == nft_trans_chain_id(trans) &&
2764 nft_active_genmask(chain, genmask))
2765 return chain;
2766 }
2767 return ERR_PTR(-ENOENT);
2768 }
2769
nf_tables_newchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2770 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2771 const struct nlattr * const nla[])
2772 {
2773 struct nftables_pernet *nft_net = nft_pernet(info->net);
2774 struct netlink_ext_ack *extack = info->extack;
2775 u8 genmask = nft_genmask_next(info->net);
2776 u8 family = info->nfmsg->nfgen_family;
2777 struct nft_chain *chain = NULL;
2778 struct net *net = info->net;
2779 const struct nlattr *attr;
2780 struct nft_table *table;
2781 u8 policy = NF_ACCEPT;
2782 struct nft_ctx ctx;
2783 u64 handle = 0;
2784 u32 flags = 0;
2785
2786 lockdep_assert_held(&nft_net->commit_mutex);
2787
2788 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2789 NETLINK_CB(skb).portid);
2790 if (IS_ERR(table)) {
2791 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2792 return PTR_ERR(table);
2793 }
2794
2795 chain = NULL;
2796 attr = nla[NFTA_CHAIN_NAME];
2797
2798 if (nla[NFTA_CHAIN_HANDLE]) {
2799 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2800 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2801 if (IS_ERR(chain)) {
2802 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2803 return PTR_ERR(chain);
2804 }
2805 attr = nla[NFTA_CHAIN_HANDLE];
2806 } else if (nla[NFTA_CHAIN_NAME]) {
2807 chain = nft_chain_lookup(net, table, attr, genmask);
2808 if (IS_ERR(chain)) {
2809 if (PTR_ERR(chain) != -ENOENT) {
2810 NL_SET_BAD_ATTR(extack, attr);
2811 return PTR_ERR(chain);
2812 }
2813 chain = NULL;
2814 }
2815 } else if (!nla[NFTA_CHAIN_ID]) {
2816 return -EINVAL;
2817 }
2818
2819 if (nla[NFTA_CHAIN_POLICY]) {
2820 if (chain != NULL &&
2821 !nft_is_base_chain(chain)) {
2822 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2823 return -EOPNOTSUPP;
2824 }
2825
2826 if (chain == NULL &&
2827 nla[NFTA_CHAIN_HOOK] == NULL) {
2828 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2829 return -EOPNOTSUPP;
2830 }
2831
2832 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2833 switch (policy) {
2834 case NF_DROP:
2835 case NF_ACCEPT:
2836 break;
2837 default:
2838 return -EINVAL;
2839 }
2840 }
2841
2842 if (nla[NFTA_CHAIN_FLAGS])
2843 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2844 else if (chain)
2845 flags = chain->flags;
2846
2847 if (flags & ~NFT_CHAIN_FLAGS)
2848 return -EOPNOTSUPP;
2849
2850 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2851
2852 if (chain != NULL) {
2853 if (chain->flags & NFT_CHAIN_BINDING)
2854 return -EINVAL;
2855
2856 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2857 NL_SET_BAD_ATTR(extack, attr);
2858 return -EEXIST;
2859 }
2860 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2861 return -EOPNOTSUPP;
2862
2863 flags |= chain->flags & NFT_CHAIN_BASE;
2864 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2865 extack);
2866 }
2867
2868 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2869 }
2870
nft_delchain_hook(struct nft_ctx * ctx,struct nft_base_chain * basechain,struct netlink_ext_ack * extack)2871 static int nft_delchain_hook(struct nft_ctx *ctx,
2872 struct nft_base_chain *basechain,
2873 struct netlink_ext_ack *extack)
2874 {
2875 const struct nft_chain *chain = &basechain->chain;
2876 const struct nlattr * const *nla = ctx->nla;
2877 struct nft_chain_hook chain_hook = {};
2878 struct nft_hook *this, *hook;
2879 LIST_HEAD(chain_del_list);
2880 struct nft_trans *trans;
2881 int err;
2882
2883 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
2884 return -EOPNOTSUPP;
2885
2886 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2887 ctx->family, chain->flags, extack);
2888 if (err < 0)
2889 return err;
2890
2891 list_for_each_entry(this, &chain_hook.list, list) {
2892 hook = nft_hook_list_find(&basechain->hook_list, this);
2893 if (!hook) {
2894 err = -ENOENT;
2895 goto err_chain_del_hook;
2896 }
2897 list_move(&hook->list, &chain_del_list);
2898 }
2899
2900 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2901 sizeof(struct nft_trans_chain));
2902 if (!trans) {
2903 err = -ENOMEM;
2904 goto err_chain_del_hook;
2905 }
2906
2907 nft_trans_basechain(trans) = basechain;
2908 nft_trans_chain_update(trans) = true;
2909 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2910 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2911 nft_chain_release_hook(&chain_hook);
2912
2913 nft_trans_commit_list_add_tail(ctx->net, trans);
2914
2915 return 0;
2916
2917 err_chain_del_hook:
2918 list_splice(&chain_del_list, &basechain->hook_list);
2919 nft_chain_release_hook(&chain_hook);
2920
2921 return err;
2922 }
2923
nf_tables_delchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2924 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2925 const struct nlattr * const nla[])
2926 {
2927 struct netlink_ext_ack *extack = info->extack;
2928 u8 genmask = nft_genmask_next(info->net);
2929 u8 family = info->nfmsg->nfgen_family;
2930 struct net *net = info->net;
2931 const struct nlattr *attr;
2932 struct nft_table *table;
2933 struct nft_chain *chain;
2934 struct nft_rule *rule;
2935 struct nft_ctx ctx;
2936 u64 handle;
2937 u32 use;
2938 int err;
2939
2940 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2941 NETLINK_CB(skb).portid);
2942 if (IS_ERR(table)) {
2943 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2944 return PTR_ERR(table);
2945 }
2946
2947 if (nla[NFTA_CHAIN_HANDLE]) {
2948 attr = nla[NFTA_CHAIN_HANDLE];
2949 handle = be64_to_cpu(nla_get_be64(attr));
2950 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2951 } else {
2952 attr = nla[NFTA_CHAIN_NAME];
2953 chain = nft_chain_lookup(net, table, attr, genmask);
2954 }
2955 if (IS_ERR(chain)) {
2956 if (PTR_ERR(chain) == -ENOENT &&
2957 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2958 return 0;
2959
2960 NL_SET_BAD_ATTR(extack, attr);
2961 return PTR_ERR(chain);
2962 }
2963
2964 if (nft_chain_binding(chain))
2965 return -EOPNOTSUPP;
2966
2967 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2968
2969 if (nla[NFTA_CHAIN_HOOK]) {
2970 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
2971 chain->flags & NFT_CHAIN_HW_OFFLOAD)
2972 return -EOPNOTSUPP;
2973
2974 if (nft_is_base_chain(chain)) {
2975 struct nft_base_chain *basechain = nft_base_chain(chain);
2976
2977 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2978 return nft_delchain_hook(&ctx, basechain, extack);
2979 }
2980 }
2981
2982 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2983 chain->use > 0)
2984 return -EBUSY;
2985
2986 use = chain->use;
2987 list_for_each_entry(rule, &chain->rules, list) {
2988 if (!nft_is_active_next(net, rule))
2989 continue;
2990 use--;
2991
2992 err = nft_delrule(&ctx, rule);
2993 if (err < 0)
2994 return err;
2995 }
2996
2997 /* There are rules and elements that are still holding references to us,
2998 * we cannot do a recursive removal in this case.
2999 */
3000 if (use > 0) {
3001 NL_SET_BAD_ATTR(extack, attr);
3002 return -EBUSY;
3003 }
3004
3005 return nft_delchain(&ctx);
3006 }
3007
3008 /*
3009 * Expressions
3010 */
3011
3012 /**
3013 * nft_register_expr - register nf_tables expr type
3014 * @type: expr type
3015 *
3016 * Registers the expr type for use with nf_tables. Returns zero on
3017 * success or a negative errno code otherwise.
3018 */
nft_register_expr(struct nft_expr_type * type)3019 int nft_register_expr(struct nft_expr_type *type)
3020 {
3021 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3022 if (type->family == NFPROTO_UNSPEC)
3023 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3024 else
3025 list_add_rcu(&type->list, &nf_tables_expressions);
3026 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3027 return 0;
3028 }
3029 EXPORT_SYMBOL_GPL(nft_register_expr);
3030
3031 /**
3032 * nft_unregister_expr - unregister nf_tables expr type
3033 * @type: expr type
3034 *
3035 * Unregisters the expr typefor use with nf_tables.
3036 */
nft_unregister_expr(struct nft_expr_type * type)3037 void nft_unregister_expr(struct nft_expr_type *type)
3038 {
3039 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3040 list_del_rcu(&type->list);
3041 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3042 }
3043 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3044
__nft_expr_type_get(u8 family,struct nlattr * nla)3045 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3046 struct nlattr *nla)
3047 {
3048 const struct nft_expr_type *type, *candidate = NULL;
3049
3050 list_for_each_entry_rcu(type, &nf_tables_expressions, list) {
3051 if (!nla_strcmp(nla, type->name)) {
3052 if (!type->family && !candidate)
3053 candidate = type;
3054 else if (type->family == family)
3055 candidate = type;
3056 }
3057 }
3058 return candidate;
3059 }
3060
3061 #ifdef CONFIG_MODULES
nft_expr_type_request_module(struct net * net,u8 family,struct nlattr * nla)3062 static int nft_expr_type_request_module(struct net *net, u8 family,
3063 struct nlattr *nla)
3064 {
3065 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3066 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3067 return -EAGAIN;
3068
3069 return 0;
3070 }
3071 #endif
3072
nft_expr_type_get(struct net * net,u8 family,struct nlattr * nla)3073 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3074 u8 family,
3075 struct nlattr *nla)
3076 {
3077 const struct nft_expr_type *type;
3078
3079 if (nla == NULL)
3080 return ERR_PTR(-EINVAL);
3081
3082 rcu_read_lock();
3083 type = __nft_expr_type_get(family, nla);
3084 if (type != NULL && try_module_get(type->owner)) {
3085 rcu_read_unlock();
3086 return type;
3087 }
3088 rcu_read_unlock();
3089
3090 lockdep_nfnl_nft_mutex_not_held();
3091 #ifdef CONFIG_MODULES
3092 if (type == NULL) {
3093 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3094 return ERR_PTR(-EAGAIN);
3095
3096 if (nft_request_module(net, "nft-expr-%.*s",
3097 nla_len(nla),
3098 (char *)nla_data(nla)) == -EAGAIN)
3099 return ERR_PTR(-EAGAIN);
3100 }
3101 #endif
3102 return ERR_PTR(-ENOENT);
3103 }
3104
3105 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3106 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3107 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3108 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3109 };
3110
nf_tables_fill_expr_info(struct sk_buff * skb,const struct nft_expr * expr,bool reset)3111 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3112 const struct nft_expr *expr, bool reset)
3113 {
3114 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3115 goto nla_put_failure;
3116
3117 if (expr->ops->dump) {
3118 struct nlattr *data = nla_nest_start_noflag(skb,
3119 NFTA_EXPR_DATA);
3120 if (data == NULL)
3121 goto nla_put_failure;
3122 if (expr->ops->dump(skb, expr, reset) < 0)
3123 goto nla_put_failure;
3124 nla_nest_end(skb, data);
3125 }
3126
3127 return skb->len;
3128
3129 nla_put_failure:
3130 return -1;
3131 };
3132
nft_expr_dump(struct sk_buff * skb,unsigned int attr,const struct nft_expr * expr,bool reset)3133 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3134 const struct nft_expr *expr, bool reset)
3135 {
3136 struct nlattr *nest;
3137
3138 nest = nla_nest_start_noflag(skb, attr);
3139 if (!nest)
3140 goto nla_put_failure;
3141 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3142 goto nla_put_failure;
3143 nla_nest_end(skb, nest);
3144 return 0;
3145
3146 nla_put_failure:
3147 return -1;
3148 }
3149
3150 struct nft_expr_info {
3151 const struct nft_expr_ops *ops;
3152 const struct nlattr *attr;
3153 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3154 };
3155
nf_tables_expr_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)3156 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3157 const struct nlattr *nla,
3158 struct nft_expr_info *info)
3159 {
3160 const struct nft_expr_type *type;
3161 const struct nft_expr_ops *ops;
3162 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3163 int err;
3164
3165 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3166 nft_expr_policy, NULL);
3167 if (err < 0)
3168 return err;
3169
3170 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3171 if (IS_ERR(type))
3172 return PTR_ERR(type);
3173
3174 if (tb[NFTA_EXPR_DATA]) {
3175 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3176 tb[NFTA_EXPR_DATA],
3177 type->policy, NULL);
3178 if (err < 0)
3179 goto err1;
3180 } else
3181 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3182
3183 if (type->select_ops != NULL) {
3184 ops = type->select_ops(ctx,
3185 (const struct nlattr * const *)info->tb);
3186 if (IS_ERR(ops)) {
3187 err = PTR_ERR(ops);
3188 #ifdef CONFIG_MODULES
3189 if (err == -EAGAIN)
3190 if (nft_expr_type_request_module(ctx->net,
3191 ctx->family,
3192 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3193 err = -ENOENT;
3194 #endif
3195 goto err1;
3196 }
3197 } else
3198 ops = type->ops;
3199
3200 info->attr = nla;
3201 info->ops = ops;
3202
3203 return 0;
3204
3205 err1:
3206 module_put(type->owner);
3207 return err;
3208 }
3209
nft_expr_inner_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)3210 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3211 struct nft_expr_info *info)
3212 {
3213 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3214 const struct nft_expr_type *type;
3215 int err;
3216
3217 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3218 nft_expr_policy, NULL);
3219 if (err < 0)
3220 return err;
3221
3222 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3223 return -EINVAL;
3224
3225 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3226 if (!type)
3227 return -ENOENT;
3228
3229 if (!type->inner_ops)
3230 return -EOPNOTSUPP;
3231
3232 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3233 tb[NFTA_EXPR_DATA],
3234 type->policy, NULL);
3235 if (err < 0)
3236 goto err_nla_parse;
3237
3238 info->attr = nla;
3239 info->ops = type->inner_ops;
3240
3241 return 0;
3242
3243 err_nla_parse:
3244 return err;
3245 }
3246
nf_tables_newexpr(const struct nft_ctx * ctx,const struct nft_expr_info * expr_info,struct nft_expr * expr)3247 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3248 const struct nft_expr_info *expr_info,
3249 struct nft_expr *expr)
3250 {
3251 const struct nft_expr_ops *ops = expr_info->ops;
3252 int err;
3253
3254 expr->ops = ops;
3255 if (ops->init) {
3256 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3257 if (err < 0)
3258 goto err1;
3259 }
3260
3261 return 0;
3262 err1:
3263 expr->ops = NULL;
3264 return err;
3265 }
3266
nf_tables_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)3267 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3268 struct nft_expr *expr)
3269 {
3270 const struct nft_expr_type *type = expr->ops->type;
3271
3272 if (expr->ops->destroy)
3273 expr->ops->destroy(ctx, expr);
3274 module_put(type->owner);
3275 }
3276
nft_expr_init(const struct nft_ctx * ctx,const struct nlattr * nla)3277 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3278 const struct nlattr *nla)
3279 {
3280 struct nft_expr_info expr_info;
3281 struct nft_expr *expr;
3282 struct module *owner;
3283 int err;
3284
3285 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3286 if (err < 0)
3287 goto err_expr_parse;
3288
3289 err = -EOPNOTSUPP;
3290 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3291 goto err_expr_stateful;
3292
3293 err = -ENOMEM;
3294 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3295 if (expr == NULL)
3296 goto err_expr_stateful;
3297
3298 err = nf_tables_newexpr(ctx, &expr_info, expr);
3299 if (err < 0)
3300 goto err_expr_new;
3301
3302 return expr;
3303 err_expr_new:
3304 kfree(expr);
3305 err_expr_stateful:
3306 owner = expr_info.ops->type->owner;
3307 if (expr_info.ops->type->release_ops)
3308 expr_info.ops->type->release_ops(expr_info.ops);
3309
3310 module_put(owner);
3311 err_expr_parse:
3312 return ERR_PTR(err);
3313 }
3314
nft_expr_clone(struct nft_expr * dst,struct nft_expr * src)3315 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3316 {
3317 int err;
3318
3319 if (src->ops->clone) {
3320 dst->ops = src->ops;
3321 err = src->ops->clone(dst, src);
3322 if (err < 0)
3323 return err;
3324 } else {
3325 memcpy(dst, src, src->ops->size);
3326 }
3327
3328 __module_get(src->ops->type->owner);
3329
3330 return 0;
3331 }
3332
nft_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)3333 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3334 {
3335 nf_tables_expr_destroy(ctx, expr);
3336 kfree(expr);
3337 }
3338
3339 /*
3340 * Rules
3341 */
3342
__nft_rule_lookup(const struct nft_chain * chain,u64 handle)3343 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3344 u64 handle)
3345 {
3346 struct nft_rule *rule;
3347
3348 // FIXME: this sucks
3349 list_for_each_entry_rcu(rule, &chain->rules, list) {
3350 if (handle == rule->handle)
3351 return rule;
3352 }
3353
3354 return ERR_PTR(-ENOENT);
3355 }
3356
nft_rule_lookup(const struct nft_chain * chain,const struct nlattr * nla)3357 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3358 const struct nlattr *nla)
3359 {
3360 if (nla == NULL)
3361 return ERR_PTR(-EINVAL);
3362
3363 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3364 }
3365
3366 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3367 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3368 .len = NFT_TABLE_MAXNAMELEN - 1 },
3369 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3370 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3371 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3372 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3373 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3374 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3375 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3376 .len = NFT_USERDATA_MAXLEN },
3377 [NFTA_RULE_ID] = { .type = NLA_U32 },
3378 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3379 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3380 };
3381
nf_tables_fill_rule_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,const struct nft_chain * chain,const struct nft_rule * rule,u64 handle,bool reset)3382 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3383 u32 portid, u32 seq, int event,
3384 u32 flags, int family,
3385 const struct nft_table *table,
3386 const struct nft_chain *chain,
3387 const struct nft_rule *rule, u64 handle,
3388 bool reset)
3389 {
3390 struct nlmsghdr *nlh;
3391 const struct nft_expr *expr, *next;
3392 struct nlattr *list;
3393 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3394
3395 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3396 nft_base_seq(net));
3397 if (!nlh)
3398 goto nla_put_failure;
3399
3400 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3401 goto nla_put_failure;
3402 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3403 goto nla_put_failure;
3404 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3405 NFTA_RULE_PAD))
3406 goto nla_put_failure;
3407
3408 if (event != NFT_MSG_DELRULE && handle) {
3409 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3410 NFTA_RULE_PAD))
3411 goto nla_put_failure;
3412 }
3413
3414 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3415 nft_flow_rule_stats(chain, rule);
3416
3417 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3418 if (list == NULL)
3419 goto nla_put_failure;
3420 nft_rule_for_each_expr(expr, next, rule) {
3421 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3422 goto nla_put_failure;
3423 }
3424 nla_nest_end(skb, list);
3425
3426 if (rule->udata) {
3427 struct nft_userdata *udata = nft_userdata(rule);
3428 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3429 udata->data) < 0)
3430 goto nla_put_failure;
3431 }
3432
3433 nlmsg_end(skb, nlh);
3434 return 0;
3435
3436 nla_put_failure:
3437 nlmsg_trim(skb, nlh);
3438 return -1;
3439 }
3440
nf_tables_rule_notify(const struct nft_ctx * ctx,const struct nft_rule * rule,int event)3441 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3442 const struct nft_rule *rule, int event)
3443 {
3444 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3445 const struct nft_rule *prule;
3446 struct sk_buff *skb;
3447 u64 handle = 0;
3448 u16 flags = 0;
3449 int err;
3450
3451 if (!ctx->report &&
3452 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3453 return;
3454
3455 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3456 if (skb == NULL)
3457 goto err;
3458
3459 if (event == NFT_MSG_NEWRULE &&
3460 !list_is_first(&rule->list, &ctx->chain->rules) &&
3461 !list_is_last(&rule->list, &ctx->chain->rules)) {
3462 prule = list_prev_entry(rule, list);
3463 handle = prule->handle;
3464 }
3465 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3466 flags |= NLM_F_APPEND;
3467 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3468 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3469
3470 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3471 event, flags, ctx->family, ctx->table,
3472 ctx->chain, rule, handle, false);
3473 if (err < 0) {
3474 kfree_skb(skb);
3475 goto err;
3476 }
3477
3478 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3479 return;
3480 err:
3481 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3482 }
3483
audit_log_rule_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)3484 static void audit_log_rule_reset(const struct nft_table *table,
3485 unsigned int base_seq,
3486 unsigned int nentries)
3487 {
3488 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3489 table->name, base_seq);
3490
3491 audit_log_nfcfg(buf, table->family, nentries,
3492 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3493 kfree(buf);
3494 }
3495
3496 struct nft_rule_dump_ctx {
3497 char *table;
3498 char *chain;
3499 };
3500
__nf_tables_dump_rules(struct sk_buff * skb,unsigned int * idx,struct netlink_callback * cb,const struct nft_table * table,const struct nft_chain * chain,bool reset)3501 static int __nf_tables_dump_rules(struct sk_buff *skb,
3502 unsigned int *idx,
3503 struct netlink_callback *cb,
3504 const struct nft_table *table,
3505 const struct nft_chain *chain,
3506 bool reset)
3507 {
3508 struct net *net = sock_net(skb->sk);
3509 const struct nft_rule *rule, *prule;
3510 unsigned int s_idx = cb->args[0];
3511 unsigned int entries = 0;
3512 int ret = 0;
3513 u64 handle;
3514
3515 prule = NULL;
3516 list_for_each_entry_rcu(rule, &chain->rules, list) {
3517 if (!nft_is_active(net, rule))
3518 goto cont_skip;
3519 if (*idx < s_idx)
3520 goto cont;
3521 if (prule)
3522 handle = prule->handle;
3523 else
3524 handle = 0;
3525
3526 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3527 cb->nlh->nlmsg_seq,
3528 NFT_MSG_NEWRULE,
3529 NLM_F_MULTI | NLM_F_APPEND,
3530 table->family,
3531 table, chain, rule, handle, reset) < 0) {
3532 ret = 1;
3533 break;
3534 }
3535 entries++;
3536 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3537 cont:
3538 prule = rule;
3539 cont_skip:
3540 (*idx)++;
3541 }
3542
3543 if (reset && entries)
3544 audit_log_rule_reset(table, cb->seq, entries);
3545
3546 return ret;
3547 }
3548
nf_tables_dump_rules(struct sk_buff * skb,struct netlink_callback * cb)3549 static int nf_tables_dump_rules(struct sk_buff *skb,
3550 struct netlink_callback *cb)
3551 {
3552 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3553 const struct nft_rule_dump_ctx *ctx = cb->data;
3554 struct nft_table *table;
3555 const struct nft_chain *chain;
3556 unsigned int idx = 0;
3557 struct net *net = sock_net(skb->sk);
3558 int family = nfmsg->nfgen_family;
3559 struct nftables_pernet *nft_net;
3560 bool reset = false;
3561
3562 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3563 reset = true;
3564
3565 rcu_read_lock();
3566 nft_net = nft_pernet(net);
3567 cb->seq = READ_ONCE(nft_net->base_seq);
3568
3569 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3570 if (family != NFPROTO_UNSPEC && family != table->family)
3571 continue;
3572
3573 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3574 continue;
3575
3576 if (ctx && ctx->table && ctx->chain) {
3577 struct rhlist_head *list, *tmp;
3578
3579 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3580 nft_chain_ht_params);
3581 if (!list)
3582 goto done;
3583
3584 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3585 if (!nft_is_active(net, chain))
3586 continue;
3587 __nf_tables_dump_rules(skb, &idx,
3588 cb, table, chain, reset);
3589 break;
3590 }
3591 goto done;
3592 }
3593
3594 list_for_each_entry_rcu(chain, &table->chains, list) {
3595 if (__nf_tables_dump_rules(skb, &idx,
3596 cb, table, chain, reset))
3597 goto done;
3598 }
3599
3600 if (ctx && ctx->table)
3601 break;
3602 }
3603 done:
3604 rcu_read_unlock();
3605
3606 cb->args[0] = idx;
3607 return skb->len;
3608 }
3609
nf_tables_dump_rules_start(struct netlink_callback * cb)3610 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3611 {
3612 const struct nlattr * const *nla = cb->data;
3613 struct nft_rule_dump_ctx *ctx = NULL;
3614
3615 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3616 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3617 if (!ctx)
3618 return -ENOMEM;
3619
3620 if (nla[NFTA_RULE_TABLE]) {
3621 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3622 GFP_ATOMIC);
3623 if (!ctx->table) {
3624 kfree(ctx);
3625 return -ENOMEM;
3626 }
3627 }
3628 if (nla[NFTA_RULE_CHAIN]) {
3629 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3630 GFP_ATOMIC);
3631 if (!ctx->chain) {
3632 kfree(ctx->table);
3633 kfree(ctx);
3634 return -ENOMEM;
3635 }
3636 }
3637 }
3638
3639 cb->data = ctx;
3640 return 0;
3641 }
3642
nf_tables_dump_rules_done(struct netlink_callback * cb)3643 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3644 {
3645 struct nft_rule_dump_ctx *ctx = cb->data;
3646
3647 if (ctx) {
3648 kfree(ctx->table);
3649 kfree(ctx->chain);
3650 kfree(ctx);
3651 }
3652 return 0;
3653 }
3654
3655 /* called with rcu_read_lock held */
nf_tables_getrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3656 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3657 const struct nlattr * const nla[])
3658 {
3659 struct netlink_ext_ack *extack = info->extack;
3660 u8 genmask = nft_genmask_cur(info->net);
3661 u8 family = info->nfmsg->nfgen_family;
3662 const struct nft_chain *chain;
3663 const struct nft_rule *rule;
3664 struct net *net = info->net;
3665 struct nft_table *table;
3666 struct sk_buff *skb2;
3667 bool reset = false;
3668 int err;
3669
3670 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3671 struct netlink_dump_control c = {
3672 .start= nf_tables_dump_rules_start,
3673 .dump = nf_tables_dump_rules,
3674 .done = nf_tables_dump_rules_done,
3675 .module = THIS_MODULE,
3676 .data = (void *)nla,
3677 };
3678
3679 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3680 }
3681
3682 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3683 if (IS_ERR(table)) {
3684 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3685 return PTR_ERR(table);
3686 }
3687
3688 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3689 if (IS_ERR(chain)) {
3690 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3691 return PTR_ERR(chain);
3692 }
3693
3694 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3695 if (IS_ERR(rule)) {
3696 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3697 return PTR_ERR(rule);
3698 }
3699
3700 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3701 if (!skb2)
3702 return -ENOMEM;
3703
3704 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3705 reset = true;
3706
3707 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3708 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3709 family, table, chain, rule, 0, reset);
3710 if (err < 0)
3711 goto err_fill_rule_info;
3712
3713 if (reset)
3714 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3715
3716 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3717
3718 err_fill_rule_info:
3719 kfree_skb(skb2);
3720 return err;
3721 }
3722
nf_tables_rule_destroy(const struct nft_ctx * ctx,struct nft_rule * rule)3723 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3724 {
3725 struct nft_expr *expr, *next;
3726
3727 /*
3728 * Careful: some expressions might not be initialized in case this
3729 * is called on error from nf_tables_newrule().
3730 */
3731 expr = nft_expr_first(rule);
3732 while (nft_expr_more(rule, expr)) {
3733 next = nft_expr_next(expr);
3734 nf_tables_expr_destroy(ctx, expr);
3735 expr = next;
3736 }
3737 kfree(rule);
3738 }
3739
nf_tables_rule_release(const struct nft_ctx * ctx,struct nft_rule * rule)3740 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3741 {
3742 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3743 nf_tables_rule_destroy(ctx, rule);
3744 }
3745
3746 /** nft_chain_validate - loop detection and hook validation
3747 *
3748 * @ctx: context containing call depth and base chain
3749 * @chain: chain to validate
3750 *
3751 * Walk through the rules of the given chain and chase all jumps/gotos
3752 * and set lookups until either the jump limit is hit or all reachable
3753 * chains have been validated.
3754 */
nft_chain_validate(const struct nft_ctx * ctx,const struct nft_chain * chain)3755 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3756 {
3757 struct nft_expr *expr, *last;
3758 const struct nft_data *data;
3759 struct nft_rule *rule;
3760 int err;
3761
3762 if (ctx->level == NFT_JUMP_STACK_SIZE)
3763 return -EMLINK;
3764
3765 list_for_each_entry(rule, &chain->rules, list) {
3766 if (fatal_signal_pending(current))
3767 return -EINTR;
3768
3769 if (!nft_is_active_next(ctx->net, rule))
3770 continue;
3771
3772 nft_rule_for_each_expr(expr, last, rule) {
3773 if (!expr->ops->validate)
3774 continue;
3775
3776 /* This may call nft_chain_validate() recursively,
3777 * callers that do so must increment ctx->level.
3778 */
3779 err = expr->ops->validate(ctx, expr, &data);
3780 if (err < 0)
3781 return err;
3782 }
3783 }
3784
3785 return 0;
3786 }
3787 EXPORT_SYMBOL_GPL(nft_chain_validate);
3788
nft_table_validate(struct net * net,const struct nft_table * table)3789 static int nft_table_validate(struct net *net, const struct nft_table *table)
3790 {
3791 struct nft_chain *chain;
3792 struct nft_ctx ctx = {
3793 .net = net,
3794 .family = table->family,
3795 };
3796 int err;
3797
3798 list_for_each_entry(chain, &table->chains, list) {
3799 if (!nft_is_base_chain(chain))
3800 continue;
3801
3802 ctx.chain = chain;
3803 err = nft_chain_validate(&ctx, chain);
3804 if (err < 0)
3805 return err;
3806
3807 cond_resched();
3808 }
3809
3810 return 0;
3811 }
3812
nft_setelem_validate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)3813 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3814 const struct nft_set_iter *iter,
3815 struct nft_set_elem *elem)
3816 {
3817 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3818 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3819 const struct nft_data *data;
3820 int err;
3821
3822 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3823 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3824 return 0;
3825
3826 data = nft_set_ext_data(ext);
3827 switch (data->verdict.code) {
3828 case NFT_JUMP:
3829 case NFT_GOTO:
3830 pctx->level++;
3831 err = nft_chain_validate(ctx, data->verdict.chain);
3832 if (err < 0)
3833 return err;
3834 pctx->level--;
3835 break;
3836 default:
3837 break;
3838 }
3839
3840 return 0;
3841 }
3842
nft_set_catchall_validate(const struct nft_ctx * ctx,struct nft_set * set)3843 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3844 {
3845 u8 genmask = nft_genmask_next(ctx->net);
3846 struct nft_set_elem_catchall *catchall;
3847 struct nft_set_elem elem;
3848 struct nft_set_ext *ext;
3849 int ret = 0;
3850
3851 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3852 ext = nft_set_elem_ext(set, catchall->elem);
3853 if (!nft_set_elem_active(ext, genmask))
3854 continue;
3855
3856 elem.priv = catchall->elem;
3857 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3858 if (ret < 0)
3859 return ret;
3860 }
3861
3862 return ret;
3863 }
3864
3865 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3866 const struct nft_chain *chain,
3867 const struct nlattr *nla);
3868
3869 #define NFT_RULE_MAXEXPRS 128
3870
nf_tables_newrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3871 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3872 const struct nlattr * const nla[])
3873 {
3874 struct nftables_pernet *nft_net = nft_pernet(info->net);
3875 struct netlink_ext_ack *extack = info->extack;
3876 unsigned int size, i, n, ulen = 0, usize = 0;
3877 u8 genmask = nft_genmask_next(info->net);
3878 struct nft_rule *rule, *old_rule = NULL;
3879 struct nft_expr_info *expr_info = NULL;
3880 u8 family = info->nfmsg->nfgen_family;
3881 struct nft_flow_rule *flow = NULL;
3882 struct net *net = info->net;
3883 struct nft_userdata *udata;
3884 struct nft_table *table;
3885 struct nft_chain *chain;
3886 struct nft_trans *trans;
3887 u64 handle, pos_handle;
3888 struct nft_expr *expr;
3889 struct nft_ctx ctx;
3890 struct nlattr *tmp;
3891 int err, rem;
3892
3893 lockdep_assert_held(&nft_net->commit_mutex);
3894
3895 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3896 NETLINK_CB(skb).portid);
3897 if (IS_ERR(table)) {
3898 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3899 return PTR_ERR(table);
3900 }
3901
3902 if (nla[NFTA_RULE_CHAIN]) {
3903 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3904 genmask);
3905 if (IS_ERR(chain)) {
3906 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3907 return PTR_ERR(chain);
3908 }
3909
3910 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3911 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3912 genmask);
3913 if (IS_ERR(chain)) {
3914 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3915 return PTR_ERR(chain);
3916 }
3917 } else {
3918 return -EINVAL;
3919 }
3920
3921 if (nft_chain_is_bound(chain))
3922 return -EOPNOTSUPP;
3923
3924 if (nla[NFTA_RULE_HANDLE]) {
3925 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3926 rule = __nft_rule_lookup(chain, handle);
3927 if (IS_ERR(rule)) {
3928 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3929 return PTR_ERR(rule);
3930 }
3931
3932 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3933 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3934 return -EEXIST;
3935 }
3936 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3937 old_rule = rule;
3938 else
3939 return -EOPNOTSUPP;
3940 } else {
3941 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3942 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3943 return -EINVAL;
3944 handle = nf_tables_alloc_handle(table);
3945
3946 if (nla[NFTA_RULE_POSITION]) {
3947 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3948 old_rule = __nft_rule_lookup(chain, pos_handle);
3949 if (IS_ERR(old_rule)) {
3950 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3951 return PTR_ERR(old_rule);
3952 }
3953 } else if (nla[NFTA_RULE_POSITION_ID]) {
3954 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3955 if (IS_ERR(old_rule)) {
3956 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3957 return PTR_ERR(old_rule);
3958 }
3959 }
3960 }
3961
3962 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3963
3964 n = 0;
3965 size = 0;
3966 if (nla[NFTA_RULE_EXPRESSIONS]) {
3967 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3968 sizeof(struct nft_expr_info),
3969 GFP_KERNEL);
3970 if (!expr_info)
3971 return -ENOMEM;
3972
3973 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3974 err = -EINVAL;
3975 if (nla_type(tmp) != NFTA_LIST_ELEM)
3976 goto err_release_expr;
3977 if (n == NFT_RULE_MAXEXPRS)
3978 goto err_release_expr;
3979 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3980 if (err < 0) {
3981 NL_SET_BAD_ATTR(extack, tmp);
3982 goto err_release_expr;
3983 }
3984 size += expr_info[n].ops->size;
3985 n++;
3986 }
3987 }
3988 /* Check for overflow of dlen field */
3989 err = -EFBIG;
3990 if (size >= 1 << 12)
3991 goto err_release_expr;
3992
3993 if (nla[NFTA_RULE_USERDATA]) {
3994 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3995 if (ulen > 0)
3996 usize = sizeof(struct nft_userdata) + ulen;
3997 }
3998
3999 err = -ENOMEM;
4000 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4001 if (rule == NULL)
4002 goto err_release_expr;
4003
4004 nft_activate_next(net, rule);
4005
4006 rule->handle = handle;
4007 rule->dlen = size;
4008 rule->udata = ulen ? 1 : 0;
4009
4010 if (ulen) {
4011 udata = nft_userdata(rule);
4012 udata->len = ulen - 1;
4013 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4014 }
4015
4016 expr = nft_expr_first(rule);
4017 for (i = 0; i < n; i++) {
4018 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4019 if (err < 0) {
4020 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4021 goto err_release_rule;
4022 }
4023
4024 if (expr_info[i].ops->validate)
4025 nft_validate_state_update(table, NFT_VALIDATE_NEED);
4026
4027 expr_info[i].ops = NULL;
4028 expr = nft_expr_next(expr);
4029 }
4030
4031 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4032 flow = nft_flow_rule_create(net, rule);
4033 if (IS_ERR(flow)) {
4034 err = PTR_ERR(flow);
4035 goto err_release_rule;
4036 }
4037 }
4038
4039 if (!nft_use_inc(&chain->use)) {
4040 err = -EMFILE;
4041 goto err_release_rule;
4042 }
4043
4044 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4045 if (nft_chain_binding(chain)) {
4046 err = -EOPNOTSUPP;
4047 goto err_destroy_flow_rule;
4048 }
4049
4050 err = nft_delrule(&ctx, old_rule);
4051 if (err < 0)
4052 goto err_destroy_flow_rule;
4053
4054 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4055 if (trans == NULL) {
4056 err = -ENOMEM;
4057 goto err_destroy_flow_rule;
4058 }
4059 list_add_tail_rcu(&rule->list, &old_rule->list);
4060 } else {
4061 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4062 if (!trans) {
4063 err = -ENOMEM;
4064 goto err_destroy_flow_rule;
4065 }
4066
4067 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4068 if (old_rule)
4069 list_add_rcu(&rule->list, &old_rule->list);
4070 else
4071 list_add_tail_rcu(&rule->list, &chain->rules);
4072 } else {
4073 if (old_rule)
4074 list_add_tail_rcu(&rule->list, &old_rule->list);
4075 else
4076 list_add_rcu(&rule->list, &chain->rules);
4077 }
4078 }
4079 kvfree(expr_info);
4080
4081 if (flow)
4082 nft_trans_flow_rule(trans) = flow;
4083
4084 if (table->validate_state == NFT_VALIDATE_DO)
4085 return nft_table_validate(net, table);
4086
4087 return 0;
4088
4089 err_destroy_flow_rule:
4090 nft_use_dec_restore(&chain->use);
4091 if (flow)
4092 nft_flow_rule_destroy(flow);
4093 err_release_rule:
4094 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4095 nf_tables_rule_destroy(&ctx, rule);
4096 err_release_expr:
4097 for (i = 0; i < n; i++) {
4098 if (expr_info[i].ops) {
4099 module_put(expr_info[i].ops->type->owner);
4100 if (expr_info[i].ops->type->release_ops)
4101 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4102 }
4103 }
4104 kvfree(expr_info);
4105
4106 return err;
4107 }
4108
nft_rule_lookup_byid(const struct net * net,const struct nft_chain * chain,const struct nlattr * nla)4109 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4110 const struct nft_chain *chain,
4111 const struct nlattr *nla)
4112 {
4113 struct nftables_pernet *nft_net = nft_pernet(net);
4114 u32 id = ntohl(nla_get_be32(nla));
4115 struct nft_trans *trans;
4116
4117 list_for_each_entry(trans, &nft_net->commit_list, list) {
4118 if (trans->msg_type == NFT_MSG_NEWRULE &&
4119 trans->ctx.chain == chain &&
4120 id == nft_trans_rule_id(trans))
4121 return nft_trans_rule(trans);
4122 }
4123 return ERR_PTR(-ENOENT);
4124 }
4125
nf_tables_delrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4126 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4127 const struct nlattr * const nla[])
4128 {
4129 struct netlink_ext_ack *extack = info->extack;
4130 u8 genmask = nft_genmask_next(info->net);
4131 u8 family = info->nfmsg->nfgen_family;
4132 struct nft_chain *chain = NULL;
4133 struct net *net = info->net;
4134 struct nft_table *table;
4135 struct nft_rule *rule;
4136 struct nft_ctx ctx;
4137 int err = 0;
4138
4139 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4140 NETLINK_CB(skb).portid);
4141 if (IS_ERR(table)) {
4142 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4143 return PTR_ERR(table);
4144 }
4145
4146 if (nla[NFTA_RULE_CHAIN]) {
4147 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4148 genmask);
4149 if (IS_ERR(chain)) {
4150 if (PTR_ERR(chain) == -ENOENT &&
4151 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4152 return 0;
4153
4154 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4155 return PTR_ERR(chain);
4156 }
4157 if (nft_chain_binding(chain))
4158 return -EOPNOTSUPP;
4159 }
4160
4161 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4162
4163 if (chain) {
4164 if (nla[NFTA_RULE_HANDLE]) {
4165 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4166 if (IS_ERR(rule)) {
4167 if (PTR_ERR(rule) == -ENOENT &&
4168 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4169 return 0;
4170
4171 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4172 return PTR_ERR(rule);
4173 }
4174
4175 err = nft_delrule(&ctx, rule);
4176 } else if (nla[NFTA_RULE_ID]) {
4177 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4178 if (IS_ERR(rule)) {
4179 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4180 return PTR_ERR(rule);
4181 }
4182
4183 err = nft_delrule(&ctx, rule);
4184 } else {
4185 err = nft_delrule_by_chain(&ctx);
4186 }
4187 } else {
4188 list_for_each_entry(chain, &table->chains, list) {
4189 if (!nft_is_active_next(net, chain))
4190 continue;
4191 if (nft_chain_binding(chain))
4192 continue;
4193
4194 ctx.chain = chain;
4195 err = nft_delrule_by_chain(&ctx);
4196 if (err < 0)
4197 break;
4198 }
4199 }
4200
4201 return err;
4202 }
4203
4204 /*
4205 * Sets
4206 */
4207 static const struct nft_set_type *nft_set_types[] = {
4208 &nft_set_hash_fast_type,
4209 &nft_set_hash_type,
4210 &nft_set_rhash_type,
4211 &nft_set_bitmap_type,
4212 &nft_set_rbtree_type,
4213 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4214 &nft_set_pipapo_avx2_type,
4215 #endif
4216 &nft_set_pipapo_type,
4217 };
4218
4219 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4220 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4221 NFT_SET_EVAL)
4222
nft_set_ops_candidate(const struct nft_set_type * type,u32 flags)4223 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4224 {
4225 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4226 }
4227
4228 /*
4229 * Select a set implementation based on the data characteristics and the
4230 * given policy. The total memory use might not be known if no size is
4231 * given, in that case the amount of memory per element is used.
4232 */
4233 static const struct nft_set_ops *
nft_select_set_ops(const struct nft_ctx * ctx,const struct nlattr * const nla[],const struct nft_set_desc * desc)4234 nft_select_set_ops(const struct nft_ctx *ctx,
4235 const struct nlattr * const nla[],
4236 const struct nft_set_desc *desc)
4237 {
4238 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4239 const struct nft_set_ops *ops, *bops;
4240 struct nft_set_estimate est, best;
4241 const struct nft_set_type *type;
4242 u32 flags = 0;
4243 int i;
4244
4245 lockdep_assert_held(&nft_net->commit_mutex);
4246 lockdep_nfnl_nft_mutex_not_held();
4247
4248 if (nla[NFTA_SET_FLAGS] != NULL)
4249 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4250
4251 bops = NULL;
4252 best.size = ~0;
4253 best.lookup = ~0;
4254 best.space = ~0;
4255
4256 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4257 type = nft_set_types[i];
4258 ops = &type->ops;
4259
4260 if (!nft_set_ops_candidate(type, flags))
4261 continue;
4262 if (!ops->estimate(desc, flags, &est))
4263 continue;
4264
4265 switch (desc->policy) {
4266 case NFT_SET_POL_PERFORMANCE:
4267 if (est.lookup < best.lookup)
4268 break;
4269 if (est.lookup == best.lookup &&
4270 est.space < best.space)
4271 break;
4272 continue;
4273 case NFT_SET_POL_MEMORY:
4274 if (!desc->size) {
4275 if (est.space < best.space)
4276 break;
4277 if (est.space == best.space &&
4278 est.lookup < best.lookup)
4279 break;
4280 } else if (est.size < best.size || !bops) {
4281 break;
4282 }
4283 continue;
4284 default:
4285 break;
4286 }
4287
4288 bops = ops;
4289 best = est;
4290 }
4291
4292 if (bops != NULL)
4293 return bops;
4294
4295 return ERR_PTR(-EOPNOTSUPP);
4296 }
4297
4298 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4299 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4300 .len = NFT_TABLE_MAXNAMELEN - 1 },
4301 [NFTA_SET_NAME] = { .type = NLA_STRING,
4302 .len = NFT_SET_MAXNAMELEN - 1 },
4303 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4304 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4305 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4306 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4307 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4308 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4309 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4310 [NFTA_SET_ID] = { .type = NLA_U32 },
4311 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4312 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4313 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4314 .len = NFT_USERDATA_MAXLEN },
4315 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4316 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4317 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4318 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4319 };
4320
4321 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4322 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4323 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4324 };
4325
nft_set_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4326 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4327 const struct nlattr *nla, u8 genmask)
4328 {
4329 struct nft_set *set;
4330
4331 if (nla == NULL)
4332 return ERR_PTR(-EINVAL);
4333
4334 list_for_each_entry_rcu(set, &table->sets, list) {
4335 if (!nla_strcmp(nla, set->name) &&
4336 nft_active_genmask(set, genmask))
4337 return set;
4338 }
4339 return ERR_PTR(-ENOENT);
4340 }
4341
nft_set_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4342 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4343 const struct nlattr *nla,
4344 u8 genmask)
4345 {
4346 struct nft_set *set;
4347
4348 list_for_each_entry(set, &table->sets, list) {
4349 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4350 nft_active_genmask(set, genmask))
4351 return set;
4352 }
4353 return ERR_PTR(-ENOENT);
4354 }
4355
nft_set_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)4356 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4357 const struct nft_table *table,
4358 const struct nlattr *nla, u8 genmask)
4359 {
4360 struct nftables_pernet *nft_net = nft_pernet(net);
4361 u32 id = ntohl(nla_get_be32(nla));
4362 struct nft_trans *trans;
4363
4364 list_for_each_entry(trans, &nft_net->commit_list, list) {
4365 if (trans->msg_type == NFT_MSG_NEWSET) {
4366 struct nft_set *set = nft_trans_set(trans);
4367
4368 if (id == nft_trans_set_id(trans) &&
4369 set->table == table &&
4370 nft_active_genmask(set, genmask))
4371 return set;
4372 }
4373 }
4374 return ERR_PTR(-ENOENT);
4375 }
4376
nft_set_lookup_global(const struct net * net,const struct nft_table * table,const struct nlattr * nla_set_name,const struct nlattr * nla_set_id,u8 genmask)4377 struct nft_set *nft_set_lookup_global(const struct net *net,
4378 const struct nft_table *table,
4379 const struct nlattr *nla_set_name,
4380 const struct nlattr *nla_set_id,
4381 u8 genmask)
4382 {
4383 struct nft_set *set;
4384
4385 set = nft_set_lookup(table, nla_set_name, genmask);
4386 if (IS_ERR(set)) {
4387 if (!nla_set_id)
4388 return set;
4389
4390 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4391 }
4392 return set;
4393 }
4394 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4395
nf_tables_set_alloc_name(struct nft_ctx * ctx,struct nft_set * set,const char * name)4396 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4397 const char *name)
4398 {
4399 const struct nft_set *i;
4400 const char *p;
4401 unsigned long *inuse;
4402 unsigned int n = 0, min = 0;
4403
4404 p = strchr(name, '%');
4405 if (p != NULL) {
4406 if (p[1] != 'd' || strchr(p + 2, '%'))
4407 return -EINVAL;
4408
4409 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4410 return -EINVAL;
4411
4412 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4413 if (inuse == NULL)
4414 return -ENOMEM;
4415 cont:
4416 list_for_each_entry(i, &ctx->table->sets, list) {
4417 int tmp;
4418
4419 if (!nft_is_active_next(ctx->net, i))
4420 continue;
4421 if (!sscanf(i->name, name, &tmp))
4422 continue;
4423 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4424 continue;
4425
4426 set_bit(tmp - min, inuse);
4427 }
4428
4429 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4430 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4431 min += BITS_PER_BYTE * PAGE_SIZE;
4432 memset(inuse, 0, PAGE_SIZE);
4433 goto cont;
4434 }
4435 free_page((unsigned long)inuse);
4436 }
4437
4438 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4439 if (!set->name)
4440 return -ENOMEM;
4441
4442 list_for_each_entry(i, &ctx->table->sets, list) {
4443 if (!nft_is_active_next(ctx->net, i))
4444 continue;
4445 if (!strcmp(set->name, i->name)) {
4446 kfree(set->name);
4447 set->name = NULL;
4448 return -ENFILE;
4449 }
4450 }
4451 return 0;
4452 }
4453
nf_msecs_to_jiffies64(const struct nlattr * nla,u64 * result)4454 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4455 {
4456 u64 ms = be64_to_cpu(nla_get_be64(nla));
4457 u64 max = (u64)(~((u64)0));
4458
4459 max = div_u64(max, NSEC_PER_MSEC);
4460 if (ms >= max)
4461 return -ERANGE;
4462
4463 ms *= NSEC_PER_MSEC;
4464 *result = nsecs_to_jiffies64(ms);
4465 return 0;
4466 }
4467
nf_jiffies64_to_msecs(u64 input)4468 __be64 nf_jiffies64_to_msecs(u64 input)
4469 {
4470 return cpu_to_be64(jiffies64_to_msecs(input));
4471 }
4472
nf_tables_fill_set_concat(struct sk_buff * skb,const struct nft_set * set)4473 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4474 const struct nft_set *set)
4475 {
4476 struct nlattr *concat, *field;
4477 int i;
4478
4479 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4480 if (!concat)
4481 return -ENOMEM;
4482
4483 for (i = 0; i < set->field_count; i++) {
4484 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4485 if (!field)
4486 return -ENOMEM;
4487
4488 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4489 htonl(set->field_len[i])))
4490 return -ENOMEM;
4491
4492 nla_nest_end(skb, field);
4493 }
4494
4495 nla_nest_end(skb, concat);
4496
4497 return 0;
4498 }
4499
nf_tables_fill_set(struct sk_buff * skb,const struct nft_ctx * ctx,const struct nft_set * set,u16 event,u16 flags)4500 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4501 const struct nft_set *set, u16 event, u16 flags)
4502 {
4503 u64 timeout = READ_ONCE(set->timeout);
4504 u32 gc_int = READ_ONCE(set->gc_int);
4505 u32 portid = ctx->portid;
4506 struct nlmsghdr *nlh;
4507 struct nlattr *nest;
4508 u32 seq = ctx->seq;
4509 int i;
4510
4511 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4512 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4513 NFNETLINK_V0, nft_base_seq(ctx->net));
4514 if (!nlh)
4515 goto nla_put_failure;
4516
4517 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4518 goto nla_put_failure;
4519 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4520 goto nla_put_failure;
4521 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4522 NFTA_SET_PAD))
4523 goto nla_put_failure;
4524
4525 if (event == NFT_MSG_DELSET) {
4526 nlmsg_end(skb, nlh);
4527 return 0;
4528 }
4529
4530 if (set->flags != 0)
4531 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4532 goto nla_put_failure;
4533
4534 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4535 goto nla_put_failure;
4536 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4537 goto nla_put_failure;
4538 if (set->flags & NFT_SET_MAP) {
4539 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4540 goto nla_put_failure;
4541 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4542 goto nla_put_failure;
4543 }
4544 if (set->flags & NFT_SET_OBJECT &&
4545 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4546 goto nla_put_failure;
4547
4548 if (timeout &&
4549 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4550 nf_jiffies64_to_msecs(timeout),
4551 NFTA_SET_PAD))
4552 goto nla_put_failure;
4553 if (gc_int &&
4554 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4555 goto nla_put_failure;
4556
4557 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4558 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4559 goto nla_put_failure;
4560 }
4561
4562 if (set->udata &&
4563 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4564 goto nla_put_failure;
4565
4566 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4567 if (!nest)
4568 goto nla_put_failure;
4569 if (set->size &&
4570 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4571 goto nla_put_failure;
4572
4573 if (set->field_count > 1 &&
4574 nf_tables_fill_set_concat(skb, set))
4575 goto nla_put_failure;
4576
4577 nla_nest_end(skb, nest);
4578
4579 if (set->num_exprs == 1) {
4580 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4581 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4582 goto nla_put_failure;
4583
4584 nla_nest_end(skb, nest);
4585 } else if (set->num_exprs > 1) {
4586 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4587 if (nest == NULL)
4588 goto nla_put_failure;
4589
4590 for (i = 0; i < set->num_exprs; i++) {
4591 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4592 set->exprs[i], false) < 0)
4593 goto nla_put_failure;
4594 }
4595 nla_nest_end(skb, nest);
4596 }
4597
4598 nlmsg_end(skb, nlh);
4599 return 0;
4600
4601 nla_put_failure:
4602 nlmsg_trim(skb, nlh);
4603 return -1;
4604 }
4605
nf_tables_set_notify(const struct nft_ctx * ctx,const struct nft_set * set,int event,gfp_t gfp_flags)4606 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4607 const struct nft_set *set, int event,
4608 gfp_t gfp_flags)
4609 {
4610 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4611 u32 portid = ctx->portid;
4612 struct sk_buff *skb;
4613 u16 flags = 0;
4614 int err;
4615
4616 if (!ctx->report &&
4617 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4618 return;
4619
4620 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4621 if (skb == NULL)
4622 goto err;
4623
4624 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4625 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4626
4627 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4628 if (err < 0) {
4629 kfree_skb(skb);
4630 goto err;
4631 }
4632
4633 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4634 return;
4635 err:
4636 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4637 }
4638
nf_tables_dump_sets(struct sk_buff * skb,struct netlink_callback * cb)4639 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4640 {
4641 const struct nft_set *set;
4642 unsigned int idx, s_idx = cb->args[0];
4643 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4644 struct net *net = sock_net(skb->sk);
4645 struct nft_ctx *ctx = cb->data, ctx_set;
4646 struct nftables_pernet *nft_net;
4647
4648 if (cb->args[1])
4649 return skb->len;
4650
4651 rcu_read_lock();
4652 nft_net = nft_pernet(net);
4653 cb->seq = READ_ONCE(nft_net->base_seq);
4654
4655 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4656 if (ctx->family != NFPROTO_UNSPEC &&
4657 ctx->family != table->family)
4658 continue;
4659
4660 if (ctx->table && ctx->table != table)
4661 continue;
4662
4663 if (cur_table) {
4664 if (cur_table != table)
4665 continue;
4666
4667 cur_table = NULL;
4668 }
4669 idx = 0;
4670 list_for_each_entry_rcu(set, &table->sets, list) {
4671 if (idx < s_idx)
4672 goto cont;
4673 if (!nft_is_active(net, set))
4674 goto cont;
4675
4676 ctx_set = *ctx;
4677 ctx_set.table = table;
4678 ctx_set.family = table->family;
4679
4680 if (nf_tables_fill_set(skb, &ctx_set, set,
4681 NFT_MSG_NEWSET,
4682 NLM_F_MULTI) < 0) {
4683 cb->args[0] = idx;
4684 cb->args[2] = (unsigned long) table;
4685 goto done;
4686 }
4687 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4688 cont:
4689 idx++;
4690 }
4691 if (s_idx)
4692 s_idx = 0;
4693 }
4694 cb->args[1] = 1;
4695 done:
4696 rcu_read_unlock();
4697 return skb->len;
4698 }
4699
nf_tables_dump_sets_start(struct netlink_callback * cb)4700 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4701 {
4702 struct nft_ctx *ctx_dump = NULL;
4703
4704 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4705 if (ctx_dump == NULL)
4706 return -ENOMEM;
4707
4708 cb->data = ctx_dump;
4709 return 0;
4710 }
4711
nf_tables_dump_sets_done(struct netlink_callback * cb)4712 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4713 {
4714 kfree(cb->data);
4715 return 0;
4716 }
4717
4718 /* called with rcu_read_lock held */
nf_tables_getset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4719 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4720 const struct nlattr * const nla[])
4721 {
4722 struct netlink_ext_ack *extack = info->extack;
4723 u8 genmask = nft_genmask_cur(info->net);
4724 u8 family = info->nfmsg->nfgen_family;
4725 struct nft_table *table = NULL;
4726 struct net *net = info->net;
4727 const struct nft_set *set;
4728 struct sk_buff *skb2;
4729 struct nft_ctx ctx;
4730 int err;
4731
4732 if (nla[NFTA_SET_TABLE]) {
4733 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4734 genmask, 0);
4735 if (IS_ERR(table)) {
4736 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4737 return PTR_ERR(table);
4738 }
4739 }
4740
4741 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4742
4743 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4744 struct netlink_dump_control c = {
4745 .start = nf_tables_dump_sets_start,
4746 .dump = nf_tables_dump_sets,
4747 .done = nf_tables_dump_sets_done,
4748 .data = &ctx,
4749 .module = THIS_MODULE,
4750 };
4751
4752 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4753 }
4754
4755 /* Only accept unspec with dump */
4756 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4757 return -EAFNOSUPPORT;
4758 if (!nla[NFTA_SET_TABLE])
4759 return -EINVAL;
4760
4761 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4762 if (IS_ERR(set))
4763 return PTR_ERR(set);
4764
4765 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4766 if (skb2 == NULL)
4767 return -ENOMEM;
4768
4769 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4770 if (err < 0)
4771 goto err_fill_set_info;
4772
4773 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4774
4775 err_fill_set_info:
4776 kfree_skb(skb2);
4777 return err;
4778 }
4779
4780 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4781 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4782 };
4783
nft_set_desc_concat_parse(const struct nlattr * attr,struct nft_set_desc * desc)4784 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4785 struct nft_set_desc *desc)
4786 {
4787 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4788 u32 len;
4789 int err;
4790
4791 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4792 return -E2BIG;
4793
4794 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4795 nft_concat_policy, NULL);
4796 if (err < 0)
4797 return err;
4798
4799 if (!tb[NFTA_SET_FIELD_LEN])
4800 return -EINVAL;
4801
4802 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4803 if (!len || len > U8_MAX)
4804 return -EINVAL;
4805
4806 desc->field_len[desc->field_count++] = len;
4807
4808 return 0;
4809 }
4810
nft_set_desc_concat(struct nft_set_desc * desc,const struct nlattr * nla)4811 static int nft_set_desc_concat(struct nft_set_desc *desc,
4812 const struct nlattr *nla)
4813 {
4814 u32 num_regs = 0, key_num_regs = 0;
4815 struct nlattr *attr;
4816 int rem, err, i;
4817
4818 nla_for_each_nested(attr, nla, rem) {
4819 if (nla_type(attr) != NFTA_LIST_ELEM)
4820 return -EINVAL;
4821
4822 err = nft_set_desc_concat_parse(attr, desc);
4823 if (err < 0)
4824 return err;
4825 }
4826
4827 for (i = 0; i < desc->field_count; i++)
4828 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4829
4830 key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4831 if (key_num_regs != num_regs)
4832 return -EINVAL;
4833
4834 if (num_regs > NFT_REG32_COUNT)
4835 return -E2BIG;
4836
4837 return 0;
4838 }
4839
nf_tables_set_desc_parse(struct nft_set_desc * desc,const struct nlattr * nla)4840 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4841 const struct nlattr *nla)
4842 {
4843 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4844 int err;
4845
4846 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4847 nft_set_desc_policy, NULL);
4848 if (err < 0)
4849 return err;
4850
4851 if (da[NFTA_SET_DESC_SIZE] != NULL)
4852 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4853 if (da[NFTA_SET_DESC_CONCAT])
4854 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4855
4856 return err;
4857 }
4858
nft_set_expr_alloc(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * const * nla,struct nft_expr ** exprs,int * num_exprs,u32 flags)4859 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4860 const struct nlattr * const *nla,
4861 struct nft_expr **exprs, int *num_exprs,
4862 u32 flags)
4863 {
4864 struct nft_expr *expr;
4865 int err, i;
4866
4867 if (nla[NFTA_SET_EXPR]) {
4868 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4869 if (IS_ERR(expr)) {
4870 err = PTR_ERR(expr);
4871 goto err_set_expr_alloc;
4872 }
4873 exprs[0] = expr;
4874 (*num_exprs)++;
4875 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4876 struct nlattr *tmp;
4877 int left;
4878
4879 if (!(flags & NFT_SET_EXPR)) {
4880 err = -EINVAL;
4881 goto err_set_expr_alloc;
4882 }
4883 i = 0;
4884 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4885 if (i == NFT_SET_EXPR_MAX) {
4886 err = -E2BIG;
4887 goto err_set_expr_alloc;
4888 }
4889 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4890 err = -EINVAL;
4891 goto err_set_expr_alloc;
4892 }
4893 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4894 if (IS_ERR(expr)) {
4895 err = PTR_ERR(expr);
4896 goto err_set_expr_alloc;
4897 }
4898 exprs[i++] = expr;
4899 (*num_exprs)++;
4900 }
4901 }
4902
4903 return 0;
4904
4905 err_set_expr_alloc:
4906 for (i = 0; i < *num_exprs; i++)
4907 nft_expr_destroy(ctx, exprs[i]);
4908
4909 return err;
4910 }
4911
nft_set_is_same(const struct nft_set * set,const struct nft_set_desc * desc,struct nft_expr * exprs[],u32 num_exprs,u32 flags)4912 static bool nft_set_is_same(const struct nft_set *set,
4913 const struct nft_set_desc *desc,
4914 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4915 {
4916 int i;
4917
4918 if (set->ktype != desc->ktype ||
4919 set->dtype != desc->dtype ||
4920 set->flags != flags ||
4921 set->klen != desc->klen ||
4922 set->dlen != desc->dlen ||
4923 set->field_count != desc->field_count ||
4924 set->num_exprs != num_exprs)
4925 return false;
4926
4927 for (i = 0; i < desc->field_count; i++) {
4928 if (set->field_len[i] != desc->field_len[i])
4929 return false;
4930 }
4931
4932 for (i = 0; i < num_exprs; i++) {
4933 if (set->exprs[i]->ops != exprs[i]->ops)
4934 return false;
4935 }
4936
4937 return true;
4938 }
4939
nf_tables_newset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4940 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4941 const struct nlattr * const nla[])
4942 {
4943 struct netlink_ext_ack *extack = info->extack;
4944 u8 genmask = nft_genmask_next(info->net);
4945 u8 family = info->nfmsg->nfgen_family;
4946 const struct nft_set_ops *ops;
4947 struct net *net = info->net;
4948 struct nft_set_desc desc;
4949 struct nft_table *table;
4950 unsigned char *udata;
4951 struct nft_set *set;
4952 struct nft_ctx ctx;
4953 size_t alloc_size;
4954 int num_exprs = 0;
4955 char *name;
4956 int err, i;
4957 u16 udlen;
4958 u32 flags;
4959 u64 size;
4960
4961 if (nla[NFTA_SET_TABLE] == NULL ||
4962 nla[NFTA_SET_NAME] == NULL ||
4963 nla[NFTA_SET_KEY_LEN] == NULL ||
4964 nla[NFTA_SET_ID] == NULL)
4965 return -EINVAL;
4966
4967 memset(&desc, 0, sizeof(desc));
4968
4969 desc.ktype = NFT_DATA_VALUE;
4970 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4971 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4972 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4973 return -EINVAL;
4974 }
4975
4976 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4977 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4978 return -EINVAL;
4979
4980 flags = 0;
4981 if (nla[NFTA_SET_FLAGS] != NULL) {
4982 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4983 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4984 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4985 NFT_SET_MAP | NFT_SET_EVAL |
4986 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4987 return -EOPNOTSUPP;
4988 /* Only one of these operations is supported */
4989 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4990 (NFT_SET_MAP | NFT_SET_OBJECT))
4991 return -EOPNOTSUPP;
4992 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4993 (NFT_SET_EVAL | NFT_SET_OBJECT))
4994 return -EOPNOTSUPP;
4995 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
4996 (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
4997 return -EOPNOTSUPP;
4998 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
4999 (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5000 return -EOPNOTSUPP;
5001 }
5002
5003 desc.dtype = 0;
5004 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5005 if (!(flags & NFT_SET_MAP))
5006 return -EINVAL;
5007
5008 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5009 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5010 desc.dtype != NFT_DATA_VERDICT)
5011 return -EINVAL;
5012
5013 if (desc.dtype != NFT_DATA_VERDICT) {
5014 if (nla[NFTA_SET_DATA_LEN] == NULL)
5015 return -EINVAL;
5016 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5017 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5018 return -EINVAL;
5019 } else
5020 desc.dlen = sizeof(struct nft_verdict);
5021 } else if (flags & NFT_SET_MAP)
5022 return -EINVAL;
5023
5024 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5025 if (!(flags & NFT_SET_OBJECT))
5026 return -EINVAL;
5027
5028 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5029 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5030 desc.objtype > NFT_OBJECT_MAX)
5031 return -EOPNOTSUPP;
5032 } else if (flags & NFT_SET_OBJECT)
5033 return -EINVAL;
5034 else
5035 desc.objtype = NFT_OBJECT_UNSPEC;
5036
5037 desc.timeout = 0;
5038 if (nla[NFTA_SET_TIMEOUT] != NULL) {
5039 if (!(flags & NFT_SET_TIMEOUT))
5040 return -EINVAL;
5041
5042 if (flags & NFT_SET_ANONYMOUS)
5043 return -EOPNOTSUPP;
5044
5045 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5046 if (err)
5047 return err;
5048 }
5049 desc.gc_int = 0;
5050 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5051 if (!(flags & NFT_SET_TIMEOUT))
5052 return -EINVAL;
5053
5054 if (flags & NFT_SET_ANONYMOUS)
5055 return -EOPNOTSUPP;
5056
5057 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5058 }
5059
5060 desc.policy = NFT_SET_POL_PERFORMANCE;
5061 if (nla[NFTA_SET_POLICY] != NULL) {
5062 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5063 switch (desc.policy) {
5064 case NFT_SET_POL_PERFORMANCE:
5065 case NFT_SET_POL_MEMORY:
5066 break;
5067 default:
5068 return -EOPNOTSUPP;
5069 }
5070 }
5071
5072 if (nla[NFTA_SET_DESC] != NULL) {
5073 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5074 if (err < 0)
5075 return err;
5076
5077 if (desc.field_count > 1) {
5078 if (!(flags & NFT_SET_CONCAT))
5079 return -EINVAL;
5080 } else if (flags & NFT_SET_CONCAT) {
5081 return -EINVAL;
5082 }
5083 } else if (flags & NFT_SET_CONCAT) {
5084 return -EINVAL;
5085 }
5086
5087 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5088 desc.expr = true;
5089
5090 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5091 NETLINK_CB(skb).portid);
5092 if (IS_ERR(table)) {
5093 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5094 return PTR_ERR(table);
5095 }
5096
5097 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5098
5099 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5100 if (IS_ERR(set)) {
5101 if (PTR_ERR(set) != -ENOENT) {
5102 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5103 return PTR_ERR(set);
5104 }
5105 } else {
5106 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5107
5108 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5109 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5110 return -EEXIST;
5111 }
5112 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5113 return -EOPNOTSUPP;
5114
5115 if (nft_set_is_anonymous(set))
5116 return -EOPNOTSUPP;
5117
5118 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5119 if (err < 0)
5120 return err;
5121
5122 err = 0;
5123 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5124 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5125 err = -EEXIST;
5126 }
5127
5128 for (i = 0; i < num_exprs; i++)
5129 nft_expr_destroy(&ctx, exprs[i]);
5130
5131 if (err < 0)
5132 return err;
5133
5134 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5135 }
5136
5137 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5138 return -ENOENT;
5139
5140 ops = nft_select_set_ops(&ctx, nla, &desc);
5141 if (IS_ERR(ops))
5142 return PTR_ERR(ops);
5143
5144 udlen = 0;
5145 if (nla[NFTA_SET_USERDATA])
5146 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5147
5148 size = 0;
5149 if (ops->privsize != NULL)
5150 size = ops->privsize(nla, &desc);
5151 alloc_size = sizeof(*set) + size + udlen;
5152 if (alloc_size < size || alloc_size > INT_MAX)
5153 return -ENOMEM;
5154
5155 if (!nft_use_inc(&table->use))
5156 return -EMFILE;
5157
5158 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5159 if (!set) {
5160 err = -ENOMEM;
5161 goto err_alloc;
5162 }
5163
5164 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5165 if (!name) {
5166 err = -ENOMEM;
5167 goto err_set_name;
5168 }
5169
5170 err = nf_tables_set_alloc_name(&ctx, set, name);
5171 kfree(name);
5172 if (err < 0)
5173 goto err_set_name;
5174
5175 udata = NULL;
5176 if (udlen) {
5177 udata = set->data + size;
5178 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5179 }
5180
5181 INIT_LIST_HEAD(&set->bindings);
5182 INIT_LIST_HEAD(&set->catchall_list);
5183 refcount_set(&set->refs, 1);
5184 set->table = table;
5185 write_pnet(&set->net, net);
5186 set->ops = ops;
5187 set->ktype = desc.ktype;
5188 set->klen = desc.klen;
5189 set->dtype = desc.dtype;
5190 set->objtype = desc.objtype;
5191 set->dlen = desc.dlen;
5192 set->flags = flags;
5193 set->size = desc.size;
5194 set->policy = desc.policy;
5195 set->udlen = udlen;
5196 set->udata = udata;
5197 set->timeout = desc.timeout;
5198 set->gc_int = desc.gc_int;
5199
5200 set->field_count = desc.field_count;
5201 for (i = 0; i < desc.field_count; i++)
5202 set->field_len[i] = desc.field_len[i];
5203
5204 err = ops->init(set, &desc, nla);
5205 if (err < 0)
5206 goto err_set_init;
5207
5208 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5209 if (err < 0)
5210 goto err_set_destroy;
5211
5212 set->num_exprs = num_exprs;
5213 set->handle = nf_tables_alloc_handle(table);
5214 INIT_LIST_HEAD(&set->pending_update);
5215
5216 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5217 if (err < 0)
5218 goto err_set_expr_alloc;
5219
5220 list_add_tail_rcu(&set->list, &table->sets);
5221
5222 return 0;
5223
5224 err_set_expr_alloc:
5225 for (i = 0; i < set->num_exprs; i++)
5226 nft_expr_destroy(&ctx, set->exprs[i]);
5227 err_set_destroy:
5228 ops->destroy(&ctx, set);
5229 err_set_init:
5230 kfree(set->name);
5231 err_set_name:
5232 kvfree(set);
5233 err_alloc:
5234 nft_use_dec_restore(&table->use);
5235
5236 return err;
5237 }
5238
nft_set_catchall_destroy(const struct nft_ctx * ctx,struct nft_set * set)5239 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5240 struct nft_set *set)
5241 {
5242 struct nft_set_elem_catchall *next, *catchall;
5243
5244 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5245 list_del_rcu(&catchall->list);
5246 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5247 kfree_rcu(catchall, rcu);
5248 }
5249 }
5250
nft_set_put(struct nft_set * set)5251 static void nft_set_put(struct nft_set *set)
5252 {
5253 if (refcount_dec_and_test(&set->refs)) {
5254 kfree(set->name);
5255 kvfree(set);
5256 }
5257 }
5258
nft_set_destroy(const struct nft_ctx * ctx,struct nft_set * set)5259 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5260 {
5261 int i;
5262
5263 if (WARN_ON(set->use > 0))
5264 return;
5265
5266 for (i = 0; i < set->num_exprs; i++)
5267 nft_expr_destroy(ctx, set->exprs[i]);
5268
5269 set->ops->destroy(ctx, set);
5270 nft_set_catchall_destroy(ctx, set);
5271 nft_set_put(set);
5272 }
5273
nf_tables_delset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])5274 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5275 const struct nlattr * const nla[])
5276 {
5277 struct netlink_ext_ack *extack = info->extack;
5278 u8 genmask = nft_genmask_next(info->net);
5279 u8 family = info->nfmsg->nfgen_family;
5280 struct net *net = info->net;
5281 const struct nlattr *attr;
5282 struct nft_table *table;
5283 struct nft_set *set;
5284 struct nft_ctx ctx;
5285
5286 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5287 return -EAFNOSUPPORT;
5288
5289 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5290 genmask, NETLINK_CB(skb).portid);
5291 if (IS_ERR(table)) {
5292 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5293 return PTR_ERR(table);
5294 }
5295
5296 if (nla[NFTA_SET_HANDLE]) {
5297 attr = nla[NFTA_SET_HANDLE];
5298 set = nft_set_lookup_byhandle(table, attr, genmask);
5299 } else {
5300 attr = nla[NFTA_SET_NAME];
5301 set = nft_set_lookup(table, attr, genmask);
5302 }
5303
5304 if (IS_ERR(set)) {
5305 if (PTR_ERR(set) == -ENOENT &&
5306 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5307 return 0;
5308
5309 NL_SET_BAD_ATTR(extack, attr);
5310 return PTR_ERR(set);
5311 }
5312 if (set->use ||
5313 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5314 atomic_read(&set->nelems) > 0)) {
5315 NL_SET_BAD_ATTR(extack, attr);
5316 return -EBUSY;
5317 }
5318
5319 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5320
5321 return nft_delset(&ctx, set);
5322 }
5323
5324 static int nft_validate_register_store(const struct nft_ctx *ctx,
5325 enum nft_registers reg,
5326 const struct nft_data *data,
5327 enum nft_data_types type,
5328 unsigned int len);
5329
nft_setelem_data_validate(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)5330 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5331 struct nft_set *set,
5332 struct nft_set_elem *elem)
5333 {
5334 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5335 enum nft_registers dreg;
5336
5337 dreg = nft_type_to_reg(set->dtype);
5338 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5339 set->dtype == NFT_DATA_VERDICT ?
5340 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5341 set->dlen);
5342 }
5343
nf_tables_bind_check_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5344 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5345 struct nft_set *set,
5346 const struct nft_set_iter *iter,
5347 struct nft_set_elem *elem)
5348 {
5349 return nft_setelem_data_validate(ctx, set, elem);
5350 }
5351
nft_set_catchall_bind_check(const struct nft_ctx * ctx,struct nft_set * set)5352 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5353 struct nft_set *set)
5354 {
5355 u8 genmask = nft_genmask_next(ctx->net);
5356 struct nft_set_elem_catchall *catchall;
5357 struct nft_set_elem elem;
5358 struct nft_set_ext *ext;
5359 int ret = 0;
5360
5361 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5362 ext = nft_set_elem_ext(set, catchall->elem);
5363 if (!nft_set_elem_active(ext, genmask))
5364 continue;
5365
5366 elem.priv = catchall->elem;
5367 ret = nft_setelem_data_validate(ctx, set, &elem);
5368 if (ret < 0)
5369 break;
5370 }
5371
5372 return ret;
5373 }
5374
nf_tables_bind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding)5375 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5376 struct nft_set_binding *binding)
5377 {
5378 struct nft_set_binding *i;
5379 struct nft_set_iter iter;
5380
5381 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5382 return -EBUSY;
5383
5384 if (binding->flags & NFT_SET_MAP) {
5385 /* If the set is already bound to the same chain all
5386 * jumps are already validated for that chain.
5387 */
5388 list_for_each_entry(i, &set->bindings, list) {
5389 if (i->flags & NFT_SET_MAP &&
5390 i->chain == binding->chain)
5391 goto bind;
5392 }
5393
5394 iter.genmask = nft_genmask_next(ctx->net);
5395 iter.skip = 0;
5396 iter.count = 0;
5397 iter.err = 0;
5398 iter.fn = nf_tables_bind_check_setelem;
5399
5400 set->ops->walk(ctx, set, &iter);
5401 if (!iter.err)
5402 iter.err = nft_set_catchall_bind_check(ctx, set);
5403
5404 if (iter.err < 0)
5405 return iter.err;
5406 }
5407 bind:
5408 if (!nft_use_inc(&set->use))
5409 return -EMFILE;
5410
5411 binding->chain = ctx->chain;
5412 list_add_tail_rcu(&binding->list, &set->bindings);
5413 nft_set_trans_bind(ctx, set);
5414
5415 return 0;
5416 }
5417 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5418
nf_tables_unbind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,bool event)5419 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5420 struct nft_set_binding *binding, bool event)
5421 {
5422 list_del_rcu(&binding->list);
5423
5424 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5425 list_del_rcu(&set->list);
5426 set->dead = 1;
5427 if (event)
5428 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5429 GFP_KERNEL);
5430 }
5431 }
5432
5433 static void nft_setelem_data_activate(const struct net *net,
5434 const struct nft_set *set,
5435 struct nft_set_elem *elem);
5436
nft_mapelem_activate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5437 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5438 struct nft_set *set,
5439 const struct nft_set_iter *iter,
5440 struct nft_set_elem *elem)
5441 {
5442 nft_setelem_data_activate(ctx->net, set, elem);
5443
5444 return 0;
5445 }
5446
nft_map_catchall_activate(const struct nft_ctx * ctx,struct nft_set * set)5447 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5448 struct nft_set *set)
5449 {
5450 u8 genmask = nft_genmask_next(ctx->net);
5451 struct nft_set_elem_catchall *catchall;
5452 struct nft_set_elem elem;
5453 struct nft_set_ext *ext;
5454
5455 list_for_each_entry(catchall, &set->catchall_list, list) {
5456 ext = nft_set_elem_ext(set, catchall->elem);
5457 if (!nft_set_elem_active(ext, genmask))
5458 continue;
5459
5460 elem.priv = catchall->elem;
5461 nft_setelem_data_activate(ctx->net, set, &elem);
5462 break;
5463 }
5464 }
5465
nft_map_activate(const struct nft_ctx * ctx,struct nft_set * set)5466 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5467 {
5468 struct nft_set_iter iter = {
5469 .genmask = nft_genmask_next(ctx->net),
5470 .fn = nft_mapelem_activate,
5471 };
5472
5473 set->ops->walk(ctx, set, &iter);
5474 WARN_ON_ONCE(iter.err);
5475
5476 nft_map_catchall_activate(ctx, set);
5477 }
5478
nf_tables_activate_set(const struct nft_ctx * ctx,struct nft_set * set)5479 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5480 {
5481 if (nft_set_is_anonymous(set)) {
5482 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5483 nft_map_activate(ctx, set);
5484
5485 nft_clear(ctx->net, set);
5486 }
5487
5488 nft_use_inc_restore(&set->use);
5489 }
5490 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5491
nf_tables_deactivate_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,enum nft_trans_phase phase)5492 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5493 struct nft_set_binding *binding,
5494 enum nft_trans_phase phase)
5495 {
5496 switch (phase) {
5497 case NFT_TRANS_PREPARE_ERROR:
5498 nft_set_trans_unbind(ctx, set);
5499 if (nft_set_is_anonymous(set))
5500 nft_deactivate_next(ctx->net, set);
5501 else
5502 list_del_rcu(&binding->list);
5503
5504 nft_use_dec(&set->use);
5505 break;
5506 case NFT_TRANS_PREPARE:
5507 if (nft_set_is_anonymous(set)) {
5508 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5509 nft_map_deactivate(ctx, set);
5510
5511 nft_deactivate_next(ctx->net, set);
5512 }
5513 nft_use_dec(&set->use);
5514 return;
5515 case NFT_TRANS_ABORT:
5516 case NFT_TRANS_RELEASE:
5517 if (nft_set_is_anonymous(set) &&
5518 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5519 nft_map_deactivate(ctx, set);
5520
5521 nft_use_dec(&set->use);
5522 fallthrough;
5523 default:
5524 nf_tables_unbind_set(ctx, set, binding,
5525 phase == NFT_TRANS_COMMIT);
5526 }
5527 }
5528 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5529
nf_tables_destroy_set(const struct nft_ctx * ctx,struct nft_set * set)5530 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5531 {
5532 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5533 nft_set_destroy(ctx, set);
5534 }
5535 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5536
5537 const struct nft_set_ext_type nft_set_ext_types[] = {
5538 [NFT_SET_EXT_KEY] = {
5539 .align = __alignof__(u32),
5540 },
5541 [NFT_SET_EXT_DATA] = {
5542 .align = __alignof__(u32),
5543 },
5544 [NFT_SET_EXT_EXPRESSIONS] = {
5545 .align = __alignof__(struct nft_set_elem_expr),
5546 },
5547 [NFT_SET_EXT_OBJREF] = {
5548 .len = sizeof(struct nft_object *),
5549 .align = __alignof__(struct nft_object *),
5550 },
5551 [NFT_SET_EXT_FLAGS] = {
5552 .len = sizeof(u8),
5553 .align = __alignof__(u8),
5554 },
5555 [NFT_SET_EXT_TIMEOUT] = {
5556 .len = sizeof(u64),
5557 .align = __alignof__(u64),
5558 },
5559 [NFT_SET_EXT_EXPIRATION] = {
5560 .len = sizeof(u64),
5561 .align = __alignof__(u64),
5562 },
5563 [NFT_SET_EXT_USERDATA] = {
5564 .len = sizeof(struct nft_userdata),
5565 .align = __alignof__(struct nft_userdata),
5566 },
5567 [NFT_SET_EXT_KEY_END] = {
5568 .align = __alignof__(u32),
5569 },
5570 };
5571
5572 /*
5573 * Set elements
5574 */
5575
5576 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5577 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5578 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5579 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5580 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5581 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5582 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5583 .len = NFT_USERDATA_MAXLEN },
5584 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5585 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5586 .len = NFT_OBJ_MAXNAMELEN - 1 },
5587 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5588 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5589 };
5590
5591 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5592 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5593 .len = NFT_TABLE_MAXNAMELEN - 1 },
5594 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5595 .len = NFT_SET_MAXNAMELEN - 1 },
5596 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5597 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5598 };
5599
nft_set_elem_expr_dump(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_ext * ext,bool reset)5600 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5601 const struct nft_set *set,
5602 const struct nft_set_ext *ext,
5603 bool reset)
5604 {
5605 struct nft_set_elem_expr *elem_expr;
5606 u32 size, num_exprs = 0;
5607 struct nft_expr *expr;
5608 struct nlattr *nest;
5609
5610 elem_expr = nft_set_ext_expr(ext);
5611 nft_setelem_expr_foreach(expr, elem_expr, size)
5612 num_exprs++;
5613
5614 if (num_exprs == 1) {
5615 expr = nft_setelem_expr_at(elem_expr, 0);
5616 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5617 return -1;
5618
5619 return 0;
5620 } else if (num_exprs > 1) {
5621 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5622 if (nest == NULL)
5623 goto nla_put_failure;
5624
5625 nft_setelem_expr_foreach(expr, elem_expr, size) {
5626 expr = nft_setelem_expr_at(elem_expr, size);
5627 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5628 goto nla_put_failure;
5629 }
5630 nla_nest_end(skb, nest);
5631 }
5632 return 0;
5633
5634 nla_put_failure:
5635 return -1;
5636 }
5637
nf_tables_fill_setelem(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_elem * elem,bool reset)5638 static int nf_tables_fill_setelem(struct sk_buff *skb,
5639 const struct nft_set *set,
5640 const struct nft_set_elem *elem,
5641 bool reset)
5642 {
5643 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5644 unsigned char *b = skb_tail_pointer(skb);
5645 struct nlattr *nest;
5646
5647 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5648 if (nest == NULL)
5649 goto nla_put_failure;
5650
5651 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5652 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5653 NFT_DATA_VALUE, set->klen) < 0)
5654 goto nla_put_failure;
5655
5656 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5657 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5658 NFT_DATA_VALUE, set->klen) < 0)
5659 goto nla_put_failure;
5660
5661 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5662 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5663 nft_set_datatype(set), set->dlen) < 0)
5664 goto nla_put_failure;
5665
5666 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5667 nft_set_elem_expr_dump(skb, set, ext, reset))
5668 goto nla_put_failure;
5669
5670 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5671 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5672 (*nft_set_ext_obj(ext))->key.name) < 0)
5673 goto nla_put_failure;
5674
5675 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5676 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5677 htonl(*nft_set_ext_flags(ext))))
5678 goto nla_put_failure;
5679
5680 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5681 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5682 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5683 NFTA_SET_ELEM_PAD))
5684 goto nla_put_failure;
5685
5686 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5687 u64 expires, now = get_jiffies_64();
5688
5689 expires = *nft_set_ext_expiration(ext);
5690 if (time_before64(now, expires))
5691 expires -= now;
5692 else
5693 expires = 0;
5694
5695 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5696 nf_jiffies64_to_msecs(expires),
5697 NFTA_SET_ELEM_PAD))
5698 goto nla_put_failure;
5699 }
5700
5701 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5702 struct nft_userdata *udata;
5703
5704 udata = nft_set_ext_userdata(ext);
5705 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5706 udata->len + 1, udata->data))
5707 goto nla_put_failure;
5708 }
5709
5710 nla_nest_end(skb, nest);
5711 return 0;
5712
5713 nla_put_failure:
5714 nlmsg_trim(skb, b);
5715 return -EMSGSIZE;
5716 }
5717
5718 struct nft_set_dump_args {
5719 const struct netlink_callback *cb;
5720 struct nft_set_iter iter;
5721 struct sk_buff *skb;
5722 bool reset;
5723 };
5724
nf_tables_dump_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5725 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5726 struct nft_set *set,
5727 const struct nft_set_iter *iter,
5728 struct nft_set_elem *elem)
5729 {
5730 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5731 struct nft_set_dump_args *args;
5732
5733 if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5734 return 0;
5735
5736 args = container_of(iter, struct nft_set_dump_args, iter);
5737 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5738 }
5739
audit_log_nft_set_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)5740 static void audit_log_nft_set_reset(const struct nft_table *table,
5741 unsigned int base_seq,
5742 unsigned int nentries)
5743 {
5744 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5745
5746 audit_log_nfcfg(buf, table->family, nentries,
5747 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5748 kfree(buf);
5749 }
5750
5751 struct nft_set_dump_ctx {
5752 const struct nft_set *set;
5753 struct nft_ctx ctx;
5754 };
5755
nft_set_catchall_dump(struct net * net,struct sk_buff * skb,const struct nft_set * set,bool reset,unsigned int base_seq)5756 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5757 const struct nft_set *set, bool reset,
5758 unsigned int base_seq)
5759 {
5760 struct nft_set_elem_catchall *catchall;
5761 u8 genmask = nft_genmask_cur(net);
5762 struct nft_set_elem elem;
5763 struct nft_set_ext *ext;
5764 int ret = 0;
5765
5766 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5767 ext = nft_set_elem_ext(set, catchall->elem);
5768 if (!nft_set_elem_active(ext, genmask) ||
5769 nft_set_elem_expired(ext))
5770 continue;
5771
5772 elem.priv = catchall->elem;
5773 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5774 if (reset && !ret)
5775 audit_log_nft_set_reset(set->table, base_seq, 1);
5776 break;
5777 }
5778
5779 return ret;
5780 }
5781
nf_tables_dump_set(struct sk_buff * skb,struct netlink_callback * cb)5782 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5783 {
5784 struct nft_set_dump_ctx *dump_ctx = cb->data;
5785 struct net *net = sock_net(skb->sk);
5786 struct nftables_pernet *nft_net;
5787 struct nft_table *table;
5788 struct nft_set *set;
5789 struct nft_set_dump_args args;
5790 bool set_found = false;
5791 struct nlmsghdr *nlh;
5792 struct nlattr *nest;
5793 bool reset = false;
5794 u32 portid, seq;
5795 int event;
5796
5797 rcu_read_lock();
5798 nft_net = nft_pernet(net);
5799 cb->seq = READ_ONCE(nft_net->base_seq);
5800
5801 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5802 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5803 dump_ctx->ctx.family != table->family)
5804 continue;
5805
5806 if (table != dump_ctx->ctx.table)
5807 continue;
5808
5809 list_for_each_entry_rcu(set, &table->sets, list) {
5810 if (set == dump_ctx->set) {
5811 set_found = true;
5812 break;
5813 }
5814 }
5815 break;
5816 }
5817
5818 if (!set_found) {
5819 rcu_read_unlock();
5820 return -ENOENT;
5821 }
5822
5823 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5824 portid = NETLINK_CB(cb->skb).portid;
5825 seq = cb->nlh->nlmsg_seq;
5826
5827 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5828 table->family, NFNETLINK_V0, nft_base_seq(net));
5829 if (!nlh)
5830 goto nla_put_failure;
5831
5832 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5833 goto nla_put_failure;
5834 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5835 goto nla_put_failure;
5836
5837 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5838 if (nest == NULL)
5839 goto nla_put_failure;
5840
5841 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5842 reset = true;
5843
5844 args.cb = cb;
5845 args.skb = skb;
5846 args.reset = reset;
5847 args.iter.genmask = nft_genmask_cur(net);
5848 args.iter.skip = cb->args[0];
5849 args.iter.count = 0;
5850 args.iter.err = 0;
5851 args.iter.fn = nf_tables_dump_setelem;
5852 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5853
5854 if (!args.iter.err && args.iter.count == cb->args[0])
5855 args.iter.err = nft_set_catchall_dump(net, skb, set,
5856 reset, cb->seq);
5857 nla_nest_end(skb, nest);
5858 nlmsg_end(skb, nlh);
5859
5860 if (reset && args.iter.count > args.iter.skip)
5861 audit_log_nft_set_reset(table, cb->seq,
5862 args.iter.count - args.iter.skip);
5863
5864 rcu_read_unlock();
5865
5866 if (args.iter.err && args.iter.err != -EMSGSIZE)
5867 return args.iter.err;
5868 if (args.iter.count == cb->args[0])
5869 return 0;
5870
5871 cb->args[0] = args.iter.count;
5872 return skb->len;
5873
5874 nla_put_failure:
5875 rcu_read_unlock();
5876 return -ENOSPC;
5877 }
5878
nf_tables_dump_set_start(struct netlink_callback * cb)5879 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5880 {
5881 struct nft_set_dump_ctx *dump_ctx = cb->data;
5882
5883 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5884
5885 return cb->data ? 0 : -ENOMEM;
5886 }
5887
nf_tables_dump_set_done(struct netlink_callback * cb)5888 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5889 {
5890 kfree(cb->data);
5891 return 0;
5892 }
5893
nf_tables_fill_setelem_info(struct sk_buff * skb,const struct nft_ctx * ctx,u32 seq,u32 portid,int event,u16 flags,const struct nft_set * set,const struct nft_set_elem * elem,bool reset)5894 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5895 const struct nft_ctx *ctx, u32 seq,
5896 u32 portid, int event, u16 flags,
5897 const struct nft_set *set,
5898 const struct nft_set_elem *elem,
5899 bool reset)
5900 {
5901 struct nlmsghdr *nlh;
5902 struct nlattr *nest;
5903 int err;
5904
5905 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5906 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5907 NFNETLINK_V0, nft_base_seq(ctx->net));
5908 if (!nlh)
5909 goto nla_put_failure;
5910
5911 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5912 goto nla_put_failure;
5913 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5914 goto nla_put_failure;
5915
5916 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5917 if (nest == NULL)
5918 goto nla_put_failure;
5919
5920 err = nf_tables_fill_setelem(skb, set, elem, reset);
5921 if (err < 0)
5922 goto nla_put_failure;
5923
5924 nla_nest_end(skb, nest);
5925
5926 nlmsg_end(skb, nlh);
5927 return 0;
5928
5929 nla_put_failure:
5930 nlmsg_trim(skb, nlh);
5931 return -1;
5932 }
5933
nft_setelem_parse_flags(const struct nft_set * set,const struct nlattr * attr,u32 * flags)5934 static int nft_setelem_parse_flags(const struct nft_set *set,
5935 const struct nlattr *attr, u32 *flags)
5936 {
5937 if (attr == NULL)
5938 return 0;
5939
5940 *flags = ntohl(nla_get_be32(attr));
5941 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5942 return -EOPNOTSUPP;
5943 if (!(set->flags & NFT_SET_INTERVAL) &&
5944 *flags & NFT_SET_ELEM_INTERVAL_END)
5945 return -EINVAL;
5946 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5947 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5948 return -EINVAL;
5949
5950 return 0;
5951 }
5952
nft_setelem_parse_key(struct nft_ctx * ctx,struct nft_set * set,struct nft_data * key,struct nlattr * attr)5953 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5954 struct nft_data *key, struct nlattr *attr)
5955 {
5956 struct nft_data_desc desc = {
5957 .type = NFT_DATA_VALUE,
5958 .size = NFT_DATA_VALUE_MAXLEN,
5959 .len = set->klen,
5960 };
5961
5962 return nft_data_init(ctx, key, &desc, attr);
5963 }
5964
nft_setelem_parse_data(struct nft_ctx * ctx,struct nft_set * set,struct nft_data_desc * desc,struct nft_data * data,struct nlattr * attr)5965 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5966 struct nft_data_desc *desc,
5967 struct nft_data *data,
5968 struct nlattr *attr)
5969 {
5970 u32 dtype;
5971
5972 if (set->dtype == NFT_DATA_VERDICT)
5973 dtype = NFT_DATA_VERDICT;
5974 else
5975 dtype = NFT_DATA_VALUE;
5976
5977 desc->type = dtype;
5978 desc->size = NFT_DATA_VALUE_MAXLEN;
5979 desc->len = set->dlen;
5980 desc->flags = NFT_DATA_DESC_SETELEM;
5981
5982 return nft_data_init(ctx, data, desc, attr);
5983 }
5984
nft_setelem_catchall_get(const struct net * net,const struct nft_set * set)5985 static void *nft_setelem_catchall_get(const struct net *net,
5986 const struct nft_set *set)
5987 {
5988 struct nft_set_elem_catchall *catchall;
5989 u8 genmask = nft_genmask_cur(net);
5990 struct nft_set_ext *ext;
5991 void *priv = NULL;
5992
5993 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5994 ext = nft_set_elem_ext(set, catchall->elem);
5995 if (!nft_set_elem_active(ext, genmask) ||
5996 nft_set_elem_expired(ext))
5997 continue;
5998
5999 priv = catchall->elem;
6000 break;
6001 }
6002
6003 return priv;
6004 }
6005
nft_setelem_get(struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6006 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
6007 struct nft_set_elem *elem, u32 flags)
6008 {
6009 void *priv;
6010
6011 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6012 priv = set->ops->get(ctx->net, set, elem, flags);
6013 if (IS_ERR(priv))
6014 return PTR_ERR(priv);
6015 } else {
6016 priv = nft_setelem_catchall_get(ctx->net, set);
6017 if (!priv)
6018 return -ENOENT;
6019 }
6020 elem->priv = priv;
6021
6022 return 0;
6023 }
6024
nft_get_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,bool reset)6025 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6026 const struct nlattr *attr, bool reset)
6027 {
6028 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6029 struct nft_set_elem elem;
6030 struct sk_buff *skb;
6031 uint32_t flags = 0;
6032 int err;
6033
6034 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6035 nft_set_elem_policy, NULL);
6036 if (err < 0)
6037 return err;
6038
6039 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6040 if (err < 0)
6041 return err;
6042
6043 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6044 return -EINVAL;
6045
6046 if (nla[NFTA_SET_ELEM_KEY]) {
6047 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6048 nla[NFTA_SET_ELEM_KEY]);
6049 if (err < 0)
6050 return err;
6051 }
6052
6053 if (nla[NFTA_SET_ELEM_KEY_END]) {
6054 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6055 nla[NFTA_SET_ELEM_KEY_END]);
6056 if (err < 0)
6057 return err;
6058 }
6059
6060 err = nft_setelem_get(ctx, set, &elem, flags);
6061 if (err < 0)
6062 return err;
6063
6064 err = -ENOMEM;
6065 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6066 if (skb == NULL)
6067 return err;
6068
6069 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6070 NFT_MSG_NEWSETELEM, 0, set, &elem,
6071 reset);
6072 if (err < 0)
6073 goto err_fill_setelem;
6074
6075 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6076
6077 err_fill_setelem:
6078 kfree_skb(skb);
6079 return err;
6080 }
6081
6082 /* called with rcu_read_lock held */
nf_tables_getsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6083 static int nf_tables_getsetelem(struct sk_buff *skb,
6084 const struct nfnl_info *info,
6085 const struct nlattr * const nla[])
6086 {
6087 struct netlink_ext_ack *extack = info->extack;
6088 u8 genmask = nft_genmask_cur(info->net);
6089 u8 family = info->nfmsg->nfgen_family;
6090 int rem, err = 0, nelems = 0;
6091 struct net *net = info->net;
6092 struct nft_table *table;
6093 struct nft_set *set;
6094 struct nlattr *attr;
6095 struct nft_ctx ctx;
6096 bool reset = false;
6097
6098 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6099 genmask, 0);
6100 if (IS_ERR(table)) {
6101 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6102 return PTR_ERR(table);
6103 }
6104
6105 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6106 if (IS_ERR(set))
6107 return PTR_ERR(set);
6108
6109 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6110
6111 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6112 struct netlink_dump_control c = {
6113 .start = nf_tables_dump_set_start,
6114 .dump = nf_tables_dump_set,
6115 .done = nf_tables_dump_set_done,
6116 .module = THIS_MODULE,
6117 };
6118 struct nft_set_dump_ctx dump_ctx = {
6119 .set = set,
6120 .ctx = ctx,
6121 };
6122
6123 c.data = &dump_ctx;
6124 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6125 }
6126
6127 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6128 return -EINVAL;
6129
6130 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6131 reset = true;
6132
6133 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6134 err = nft_get_set_elem(&ctx, set, attr, reset);
6135 if (err < 0) {
6136 NL_SET_BAD_ATTR(extack, attr);
6137 break;
6138 }
6139 nelems++;
6140 }
6141
6142 if (reset)
6143 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6144 nelems);
6145
6146 return err;
6147 }
6148
nf_tables_setelem_notify(const struct nft_ctx * ctx,const struct nft_set * set,const struct nft_set_elem * elem,int event)6149 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6150 const struct nft_set *set,
6151 const struct nft_set_elem *elem,
6152 int event)
6153 {
6154 struct nftables_pernet *nft_net;
6155 struct net *net = ctx->net;
6156 u32 portid = ctx->portid;
6157 struct sk_buff *skb;
6158 u16 flags = 0;
6159 int err;
6160
6161 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6162 return;
6163
6164 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6165 if (skb == NULL)
6166 goto err;
6167
6168 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6169 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6170
6171 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6172 set, elem, false);
6173 if (err < 0) {
6174 kfree_skb(skb);
6175 goto err;
6176 }
6177
6178 nft_net = nft_pernet(net);
6179 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6180 return;
6181 err:
6182 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6183 }
6184
nft_trans_elem_alloc(struct nft_ctx * ctx,int msg_type,struct nft_set * set)6185 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6186 int msg_type,
6187 struct nft_set *set)
6188 {
6189 struct nft_trans *trans;
6190
6191 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6192 if (trans == NULL)
6193 return NULL;
6194
6195 nft_trans_elem_set(trans) = set;
6196 return trans;
6197 }
6198
nft_set_elem_expr_alloc(const struct nft_ctx * ctx,const struct nft_set * set,const struct nlattr * attr)6199 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6200 const struct nft_set *set,
6201 const struct nlattr *attr)
6202 {
6203 struct nft_expr *expr;
6204 int err;
6205
6206 expr = nft_expr_init(ctx, attr);
6207 if (IS_ERR(expr))
6208 return expr;
6209
6210 err = -EOPNOTSUPP;
6211 if (expr->ops->type->flags & NFT_EXPR_GC) {
6212 if (set->flags & NFT_SET_TIMEOUT)
6213 goto err_set_elem_expr;
6214 if (!set->ops->gc_init)
6215 goto err_set_elem_expr;
6216 set->ops->gc_init(set);
6217 }
6218
6219 return expr;
6220
6221 err_set_elem_expr:
6222 nft_expr_destroy(ctx, expr);
6223 return ERR_PTR(err);
6224 }
6225
nft_set_ext_check(const struct nft_set_ext_tmpl * tmpl,u8 id,u32 len)6226 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6227 {
6228 len += nft_set_ext_types[id].len;
6229 if (len > tmpl->ext_len[id] ||
6230 len > U8_MAX)
6231 return -1;
6232
6233 return 0;
6234 }
6235
nft_set_ext_memcpy(const struct nft_set_ext_tmpl * tmpl,u8 id,void * to,const void * from,u32 len)6236 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6237 void *to, const void *from, u32 len)
6238 {
6239 if (nft_set_ext_check(tmpl, id, len) < 0)
6240 return -1;
6241
6242 memcpy(to, from, len);
6243
6244 return 0;
6245 }
6246
nft_set_elem_init(const struct nft_set * set,const struct nft_set_ext_tmpl * tmpl,const u32 * key,const u32 * key_end,const u32 * data,u64 timeout,u64 expiration,gfp_t gfp)6247 void *nft_set_elem_init(const struct nft_set *set,
6248 const struct nft_set_ext_tmpl *tmpl,
6249 const u32 *key, const u32 *key_end,
6250 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6251 {
6252 struct nft_set_ext *ext;
6253 void *elem;
6254
6255 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6256 if (elem == NULL)
6257 return ERR_PTR(-ENOMEM);
6258
6259 ext = nft_set_elem_ext(set, elem);
6260 nft_set_ext_init(ext, tmpl);
6261
6262 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6263 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6264 nft_set_ext_key(ext), key, set->klen) < 0)
6265 goto err_ext_check;
6266
6267 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6268 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6269 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6270 goto err_ext_check;
6271
6272 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6273 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6274 nft_set_ext_data(ext), data, set->dlen) < 0)
6275 goto err_ext_check;
6276
6277 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6278 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6279 if (expiration == 0)
6280 *nft_set_ext_expiration(ext) += timeout;
6281 }
6282 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6283 *nft_set_ext_timeout(ext) = timeout;
6284
6285 return elem;
6286
6287 err_ext_check:
6288 kfree(elem);
6289
6290 return ERR_PTR(-EINVAL);
6291 }
6292
__nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)6293 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6294 struct nft_expr *expr)
6295 {
6296 if (expr->ops->destroy_clone) {
6297 expr->ops->destroy_clone(ctx, expr);
6298 module_put(expr->ops->type->owner);
6299 } else {
6300 nf_tables_expr_destroy(ctx, expr);
6301 }
6302 }
6303
nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_set_elem_expr * elem_expr)6304 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6305 struct nft_set_elem_expr *elem_expr)
6306 {
6307 struct nft_expr *expr;
6308 u32 size;
6309
6310 nft_setelem_expr_foreach(expr, elem_expr, size)
6311 __nft_set_elem_expr_destroy(ctx, expr);
6312 }
6313
6314 /* Drop references and destroy. Called from gc, dynset and abort path. */
nft_set_elem_destroy(const struct nft_set * set,void * elem,bool destroy_expr)6315 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6316 bool destroy_expr)
6317 {
6318 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6319 struct nft_ctx ctx = {
6320 .net = read_pnet(&set->net),
6321 .family = set->table->family,
6322 };
6323
6324 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6325 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6326 nft_data_release(nft_set_ext_data(ext), set->dtype);
6327 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6328 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6329
6330 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6331 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6332 kfree(elem);
6333 }
6334 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6335
6336 /* Destroy element. References have been already dropped in the preparation
6337 * path via nft_setelem_data_deactivate().
6338 */
nf_tables_set_elem_destroy(const struct nft_ctx * ctx,const struct nft_set * set,void * elem)6339 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6340 const struct nft_set *set, void *elem)
6341 {
6342 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6343
6344 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6345 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6346
6347 kfree(elem);
6348 }
6349
nft_set_elem_expr_clone(const struct nft_ctx * ctx,struct nft_set * set,struct nft_expr * expr_array[])6350 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6351 struct nft_expr *expr_array[])
6352 {
6353 struct nft_expr *expr;
6354 int err, i, k;
6355
6356 for (i = 0; i < set->num_exprs; i++) {
6357 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6358 if (!expr)
6359 goto err_expr;
6360
6361 err = nft_expr_clone(expr, set->exprs[i]);
6362 if (err < 0) {
6363 kfree(expr);
6364 goto err_expr;
6365 }
6366 expr_array[i] = expr;
6367 }
6368
6369 return 0;
6370
6371 err_expr:
6372 for (k = i - 1; k >= 0; k--)
6373 nft_expr_destroy(ctx, expr_array[k]);
6374
6375 return -ENOMEM;
6376 }
6377
nft_set_elem_expr_setup(struct nft_ctx * ctx,const struct nft_set_ext_tmpl * tmpl,const struct nft_set_ext * ext,struct nft_expr * expr_array[],u32 num_exprs)6378 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6379 const struct nft_set_ext_tmpl *tmpl,
6380 const struct nft_set_ext *ext,
6381 struct nft_expr *expr_array[],
6382 u32 num_exprs)
6383 {
6384 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6385 u32 len = sizeof(struct nft_set_elem_expr);
6386 struct nft_expr *expr;
6387 int i, err;
6388
6389 if (num_exprs == 0)
6390 return 0;
6391
6392 for (i = 0; i < num_exprs; i++)
6393 len += expr_array[i]->ops->size;
6394
6395 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6396 return -EINVAL;
6397
6398 for (i = 0; i < num_exprs; i++) {
6399 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6400 err = nft_expr_clone(expr, expr_array[i]);
6401 if (err < 0)
6402 goto err_elem_expr_setup;
6403
6404 elem_expr->size += expr_array[i]->ops->size;
6405 nft_expr_destroy(ctx, expr_array[i]);
6406 expr_array[i] = NULL;
6407 }
6408
6409 return 0;
6410
6411 err_elem_expr_setup:
6412 for (; i < num_exprs; i++) {
6413 nft_expr_destroy(ctx, expr_array[i]);
6414 expr_array[i] = NULL;
6415 }
6416
6417 return -ENOMEM;
6418 }
6419
nft_set_catchall_lookup(const struct net * net,const struct nft_set * set)6420 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6421 const struct nft_set *set)
6422 {
6423 struct nft_set_elem_catchall *catchall;
6424 u8 genmask = nft_genmask_cur(net);
6425 struct nft_set_ext *ext;
6426
6427 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6428 ext = nft_set_elem_ext(set, catchall->elem);
6429 if (nft_set_elem_active(ext, genmask) &&
6430 !nft_set_elem_expired(ext) &&
6431 !nft_set_elem_is_dead(ext))
6432 return ext;
6433 }
6434
6435 return NULL;
6436 }
6437 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6438
nft_setelem_catchall_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** pext)6439 static int nft_setelem_catchall_insert(const struct net *net,
6440 struct nft_set *set,
6441 const struct nft_set_elem *elem,
6442 struct nft_set_ext **pext)
6443 {
6444 struct nft_set_elem_catchall *catchall;
6445 u8 genmask = nft_genmask_next(net);
6446 struct nft_set_ext *ext;
6447
6448 list_for_each_entry(catchall, &set->catchall_list, list) {
6449 ext = nft_set_elem_ext(set, catchall->elem);
6450 if (nft_set_elem_active(ext, genmask)) {
6451 *pext = ext;
6452 return -EEXIST;
6453 }
6454 }
6455
6456 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6457 if (!catchall)
6458 return -ENOMEM;
6459
6460 catchall->elem = elem->priv;
6461 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6462
6463 return 0;
6464 }
6465
nft_setelem_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** ext,unsigned int flags)6466 static int nft_setelem_insert(const struct net *net,
6467 struct nft_set *set,
6468 const struct nft_set_elem *elem,
6469 struct nft_set_ext **ext, unsigned int flags)
6470 {
6471 int ret;
6472
6473 if (flags & NFT_SET_ELEM_CATCHALL)
6474 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6475 else
6476 ret = set->ops->insert(net, set, elem, ext);
6477
6478 return ret;
6479 }
6480
nft_setelem_is_catchall(const struct nft_set * set,const struct nft_set_elem * elem)6481 static bool nft_setelem_is_catchall(const struct nft_set *set,
6482 const struct nft_set_elem *elem)
6483 {
6484 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6485
6486 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6487 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6488 return true;
6489
6490 return false;
6491 }
6492
nft_setelem_activate(struct net * net,struct nft_set * set,struct nft_set_elem * elem)6493 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6494 struct nft_set_elem *elem)
6495 {
6496 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6497
6498 if (nft_setelem_is_catchall(set, elem)) {
6499 nft_set_elem_change_active(net, set, ext);
6500 } else {
6501 set->ops->activate(net, set, elem);
6502 }
6503 }
6504
nft_setelem_catchall_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6505 static int nft_setelem_catchall_deactivate(const struct net *net,
6506 struct nft_set *set,
6507 struct nft_set_elem *elem)
6508 {
6509 struct nft_set_elem_catchall *catchall;
6510 struct nft_set_ext *ext;
6511
6512 list_for_each_entry(catchall, &set->catchall_list, list) {
6513 ext = nft_set_elem_ext(set, catchall->elem);
6514 if (!nft_is_active_next(net, ext))
6515 continue;
6516
6517 kfree(elem->priv);
6518 elem->priv = catchall->elem;
6519 nft_set_elem_change_active(net, set, ext);
6520 return 0;
6521 }
6522
6523 return -ENOENT;
6524 }
6525
__nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6526 static int __nft_setelem_deactivate(const struct net *net,
6527 struct nft_set *set,
6528 struct nft_set_elem *elem)
6529 {
6530 void *priv;
6531
6532 priv = set->ops->deactivate(net, set, elem);
6533 if (!priv)
6534 return -ENOENT;
6535
6536 kfree(elem->priv);
6537 elem->priv = priv;
6538 set->ndeact++;
6539
6540 return 0;
6541 }
6542
nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6543 static int nft_setelem_deactivate(const struct net *net,
6544 struct nft_set *set,
6545 struct nft_set_elem *elem, u32 flags)
6546 {
6547 int ret;
6548
6549 if (flags & NFT_SET_ELEM_CATCHALL)
6550 ret = nft_setelem_catchall_deactivate(net, set, elem);
6551 else
6552 ret = __nft_setelem_deactivate(net, set, elem);
6553
6554 return ret;
6555 }
6556
nft_setelem_catchall_destroy(struct nft_set_elem_catchall * catchall)6557 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6558 {
6559 list_del_rcu(&catchall->list);
6560 kfree_rcu(catchall, rcu);
6561 }
6562
nft_setelem_catchall_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6563 static void nft_setelem_catchall_remove(const struct net *net,
6564 const struct nft_set *set,
6565 const struct nft_set_elem *elem)
6566 {
6567 struct nft_set_elem_catchall *catchall, *next;
6568
6569 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6570 if (catchall->elem == elem->priv) {
6571 nft_setelem_catchall_destroy(catchall);
6572 break;
6573 }
6574 }
6575 }
6576
nft_setelem_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6577 static void nft_setelem_remove(const struct net *net,
6578 const struct nft_set *set,
6579 const struct nft_set_elem *elem)
6580 {
6581 if (nft_setelem_is_catchall(set, elem))
6582 nft_setelem_catchall_remove(net, set, elem);
6583 else
6584 set->ops->remove(net, set, elem);
6585 }
6586
nft_setelem_valid_key_end(const struct nft_set * set,struct nlattr ** nla,u32 flags)6587 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6588 struct nlattr **nla, u32 flags)
6589 {
6590 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6591 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6592 if (flags & NFT_SET_ELEM_INTERVAL_END)
6593 return false;
6594
6595 if (nla[NFTA_SET_ELEM_KEY_END] &&
6596 flags & NFT_SET_ELEM_CATCHALL)
6597 return false;
6598 } else {
6599 if (nla[NFTA_SET_ELEM_KEY_END])
6600 return false;
6601 }
6602
6603 return true;
6604 }
6605
nft_add_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,u32 nlmsg_flags)6606 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6607 const struct nlattr *attr, u32 nlmsg_flags)
6608 {
6609 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6610 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6611 u8 genmask = nft_genmask_next(ctx->net);
6612 u32 flags = 0, size = 0, num_exprs = 0;
6613 struct nft_set_ext_tmpl tmpl;
6614 struct nft_set_ext *ext, *ext2;
6615 struct nft_set_elem elem;
6616 struct nft_set_binding *binding;
6617 struct nft_object *obj = NULL;
6618 struct nft_userdata *udata;
6619 struct nft_data_desc desc;
6620 enum nft_registers dreg;
6621 struct nft_trans *trans;
6622 u64 timeout;
6623 u64 expiration;
6624 int err, i;
6625 u8 ulen;
6626
6627 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6628 nft_set_elem_policy, NULL);
6629 if (err < 0)
6630 return err;
6631
6632 nft_set_ext_prepare(&tmpl);
6633
6634 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6635 if (err < 0)
6636 return err;
6637
6638 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6639 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6640 return -EINVAL;
6641
6642 if (flags != 0) {
6643 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6644 if (err < 0)
6645 return err;
6646 }
6647
6648 if (set->flags & NFT_SET_MAP) {
6649 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6650 !(flags & NFT_SET_ELEM_INTERVAL_END))
6651 return -EINVAL;
6652 } else {
6653 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6654 return -EINVAL;
6655 }
6656
6657 if (set->flags & NFT_SET_OBJECT) {
6658 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6659 !(flags & NFT_SET_ELEM_INTERVAL_END))
6660 return -EINVAL;
6661 } else {
6662 if (nla[NFTA_SET_ELEM_OBJREF])
6663 return -EINVAL;
6664 }
6665
6666 if (!nft_setelem_valid_key_end(set, nla, flags))
6667 return -EINVAL;
6668
6669 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6670 (nla[NFTA_SET_ELEM_DATA] ||
6671 nla[NFTA_SET_ELEM_OBJREF] ||
6672 nla[NFTA_SET_ELEM_TIMEOUT] ||
6673 nla[NFTA_SET_ELEM_EXPIRATION] ||
6674 nla[NFTA_SET_ELEM_USERDATA] ||
6675 nla[NFTA_SET_ELEM_EXPR] ||
6676 nla[NFTA_SET_ELEM_KEY_END] ||
6677 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6678 return -EINVAL;
6679
6680 timeout = 0;
6681 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6682 if (!(set->flags & NFT_SET_TIMEOUT))
6683 return -EINVAL;
6684 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6685 &timeout);
6686 if (err)
6687 return err;
6688 } else if (set->flags & NFT_SET_TIMEOUT &&
6689 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6690 timeout = READ_ONCE(set->timeout);
6691 }
6692
6693 expiration = 0;
6694 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6695 if (!(set->flags & NFT_SET_TIMEOUT))
6696 return -EINVAL;
6697 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6698 &expiration);
6699 if (err)
6700 return err;
6701 }
6702
6703 if (nla[NFTA_SET_ELEM_EXPR]) {
6704 struct nft_expr *expr;
6705
6706 if (set->num_exprs && set->num_exprs != 1)
6707 return -EOPNOTSUPP;
6708
6709 expr = nft_set_elem_expr_alloc(ctx, set,
6710 nla[NFTA_SET_ELEM_EXPR]);
6711 if (IS_ERR(expr))
6712 return PTR_ERR(expr);
6713
6714 expr_array[0] = expr;
6715 num_exprs = 1;
6716
6717 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6718 err = -EOPNOTSUPP;
6719 goto err_set_elem_expr;
6720 }
6721 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6722 struct nft_expr *expr;
6723 struct nlattr *tmp;
6724 int left;
6725
6726 i = 0;
6727 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6728 if (i == NFT_SET_EXPR_MAX ||
6729 (set->num_exprs && set->num_exprs == i)) {
6730 err = -E2BIG;
6731 goto err_set_elem_expr;
6732 }
6733 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6734 err = -EINVAL;
6735 goto err_set_elem_expr;
6736 }
6737 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6738 if (IS_ERR(expr)) {
6739 err = PTR_ERR(expr);
6740 goto err_set_elem_expr;
6741 }
6742 expr_array[i] = expr;
6743 num_exprs++;
6744
6745 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6746 err = -EOPNOTSUPP;
6747 goto err_set_elem_expr;
6748 }
6749 i++;
6750 }
6751 if (set->num_exprs && set->num_exprs != i) {
6752 err = -EOPNOTSUPP;
6753 goto err_set_elem_expr;
6754 }
6755 } else if (set->num_exprs > 0 &&
6756 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6757 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6758 if (err < 0)
6759 goto err_set_elem_expr_clone;
6760
6761 num_exprs = set->num_exprs;
6762 }
6763
6764 if (nla[NFTA_SET_ELEM_KEY]) {
6765 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6766 nla[NFTA_SET_ELEM_KEY]);
6767 if (err < 0)
6768 goto err_set_elem_expr;
6769
6770 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6771 if (err < 0)
6772 goto err_parse_key;
6773 }
6774
6775 if (nla[NFTA_SET_ELEM_KEY_END]) {
6776 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6777 nla[NFTA_SET_ELEM_KEY_END]);
6778 if (err < 0)
6779 goto err_parse_key;
6780
6781 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6782 if (err < 0)
6783 goto err_parse_key_end;
6784 }
6785
6786 if (timeout > 0) {
6787 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6788 if (err < 0)
6789 goto err_parse_key_end;
6790
6791 if (timeout != READ_ONCE(set->timeout)) {
6792 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6793 if (err < 0)
6794 goto err_parse_key_end;
6795 }
6796 }
6797
6798 if (num_exprs) {
6799 for (i = 0; i < num_exprs; i++)
6800 size += expr_array[i]->ops->size;
6801
6802 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6803 sizeof(struct nft_set_elem_expr) + size);
6804 if (err < 0)
6805 goto err_parse_key_end;
6806 }
6807
6808 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6809 obj = nft_obj_lookup(ctx->net, ctx->table,
6810 nla[NFTA_SET_ELEM_OBJREF],
6811 set->objtype, genmask);
6812 if (IS_ERR(obj)) {
6813 err = PTR_ERR(obj);
6814 obj = NULL;
6815 goto err_parse_key_end;
6816 }
6817
6818 if (!nft_use_inc(&obj->use)) {
6819 err = -EMFILE;
6820 obj = NULL;
6821 goto err_parse_key_end;
6822 }
6823
6824 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6825 if (err < 0)
6826 goto err_parse_key_end;
6827 }
6828
6829 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6830 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6831 nla[NFTA_SET_ELEM_DATA]);
6832 if (err < 0)
6833 goto err_parse_key_end;
6834
6835 dreg = nft_type_to_reg(set->dtype);
6836 list_for_each_entry(binding, &set->bindings, list) {
6837 struct nft_ctx bind_ctx = {
6838 .net = ctx->net,
6839 .family = ctx->family,
6840 .table = ctx->table,
6841 .chain = (struct nft_chain *)binding->chain,
6842 };
6843
6844 if (!(binding->flags & NFT_SET_MAP))
6845 continue;
6846
6847 err = nft_validate_register_store(&bind_ctx, dreg,
6848 &elem.data.val,
6849 desc.type, desc.len);
6850 if (err < 0)
6851 goto err_parse_data;
6852
6853 if (desc.type == NFT_DATA_VERDICT &&
6854 (elem.data.val.verdict.code == NFT_GOTO ||
6855 elem.data.val.verdict.code == NFT_JUMP))
6856 nft_validate_state_update(ctx->table,
6857 NFT_VALIDATE_NEED);
6858 }
6859
6860 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6861 if (err < 0)
6862 goto err_parse_data;
6863 }
6864
6865 /* The full maximum length of userdata can exceed the maximum
6866 * offset value (U8_MAX) for following extensions, therefor it
6867 * must be the last extension added.
6868 */
6869 ulen = 0;
6870 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6871 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6872 if (ulen > 0) {
6873 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6874 ulen);
6875 if (err < 0)
6876 goto err_parse_data;
6877 }
6878 }
6879
6880 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6881 elem.key_end.val.data, elem.data.val.data,
6882 timeout, expiration, GFP_KERNEL_ACCOUNT);
6883 if (IS_ERR(elem.priv)) {
6884 err = PTR_ERR(elem.priv);
6885 goto err_parse_data;
6886 }
6887
6888 ext = nft_set_elem_ext(set, elem.priv);
6889 if (flags)
6890 *nft_set_ext_flags(ext) = flags;
6891
6892 if (obj)
6893 *nft_set_ext_obj(ext) = obj;
6894
6895 if (ulen > 0) {
6896 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6897 err = -EINVAL;
6898 goto err_elem_free;
6899 }
6900 udata = nft_set_ext_userdata(ext);
6901 udata->len = ulen - 1;
6902 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6903 }
6904 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6905 if (err < 0)
6906 goto err_elem_free;
6907
6908 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6909 if (trans == NULL) {
6910 err = -ENOMEM;
6911 goto err_elem_free;
6912 }
6913
6914 ext->genmask = nft_genmask_cur(ctx->net);
6915
6916 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6917 if (err) {
6918 if (err == -EEXIST) {
6919 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6920 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6921 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6922 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6923 goto err_element_clash;
6924 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6925 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6926 memcmp(nft_set_ext_data(ext),
6927 nft_set_ext_data(ext2), set->dlen) != 0) ||
6928 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6929 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6930 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6931 goto err_element_clash;
6932 else if (!(nlmsg_flags & NLM_F_EXCL))
6933 err = 0;
6934 } else if (err == -ENOTEMPTY) {
6935 /* ENOTEMPTY reports overlapping between this element
6936 * and an existing one.
6937 */
6938 err = -EEXIST;
6939 }
6940 goto err_element_clash;
6941 }
6942
6943 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6944 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6945
6946 if (!atomic_add_unless(&set->nelems, 1, max)) {
6947 err = -ENFILE;
6948 goto err_set_full;
6949 }
6950 }
6951
6952 nft_trans_elem(trans) = elem;
6953 nft_trans_commit_list_add_tail(ctx->net, trans);
6954 return 0;
6955
6956 err_set_full:
6957 nft_setelem_remove(ctx->net, set, &elem);
6958 err_element_clash:
6959 kfree(trans);
6960 err_elem_free:
6961 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6962 err_parse_data:
6963 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6964 nft_data_release(&elem.data.val, desc.type);
6965 err_parse_key_end:
6966 if (obj)
6967 nft_use_dec_restore(&obj->use);
6968
6969 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6970 err_parse_key:
6971 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6972 err_set_elem_expr:
6973 for (i = 0; i < num_exprs && expr_array[i]; i++)
6974 nft_expr_destroy(ctx, expr_array[i]);
6975 err_set_elem_expr_clone:
6976 return err;
6977 }
6978
nf_tables_newsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6979 static int nf_tables_newsetelem(struct sk_buff *skb,
6980 const struct nfnl_info *info,
6981 const struct nlattr * const nla[])
6982 {
6983 struct netlink_ext_ack *extack = info->extack;
6984 u8 genmask = nft_genmask_next(info->net);
6985 u8 family = info->nfmsg->nfgen_family;
6986 struct net *net = info->net;
6987 const struct nlattr *attr;
6988 struct nft_table *table;
6989 struct nft_set *set;
6990 struct nft_ctx ctx;
6991 int rem, err;
6992
6993 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6994 return -EINVAL;
6995
6996 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6997 genmask, NETLINK_CB(skb).portid);
6998 if (IS_ERR(table)) {
6999 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7000 return PTR_ERR(table);
7001 }
7002
7003 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7004 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7005 if (IS_ERR(set))
7006 return PTR_ERR(set);
7007
7008 if (!list_empty(&set->bindings) &&
7009 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7010 return -EBUSY;
7011
7012 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7013
7014 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7015 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7016 if (err < 0) {
7017 NL_SET_BAD_ATTR(extack, attr);
7018 return err;
7019 }
7020 }
7021
7022 if (table->validate_state == NFT_VALIDATE_DO)
7023 return nft_table_validate(net, table);
7024
7025 return 0;
7026 }
7027
7028 /**
7029 * nft_data_hold - hold a nft_data item
7030 *
7031 * @data: struct nft_data to release
7032 * @type: type of data
7033 *
7034 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7035 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7036 * NFT_GOTO verdicts. This function must be called on active data objects
7037 * from the second phase of the commit protocol.
7038 */
nft_data_hold(const struct nft_data * data,enum nft_data_types type)7039 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7040 {
7041 struct nft_chain *chain;
7042
7043 if (type == NFT_DATA_VERDICT) {
7044 switch (data->verdict.code) {
7045 case NFT_JUMP:
7046 case NFT_GOTO:
7047 chain = data->verdict.chain;
7048 nft_use_inc_restore(&chain->use);
7049 break;
7050 }
7051 }
7052 }
7053
nft_setelem_data_activate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7054 static void nft_setelem_data_activate(const struct net *net,
7055 const struct nft_set *set,
7056 struct nft_set_elem *elem)
7057 {
7058 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7059
7060 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7061 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7062 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7063 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7064 }
7065
nft_setelem_data_deactivate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7066 void nft_setelem_data_deactivate(const struct net *net,
7067 const struct nft_set *set,
7068 struct nft_set_elem *elem)
7069 {
7070 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7071
7072 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7073 nft_data_release(nft_set_ext_data(ext), set->dtype);
7074 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7075 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7076 }
7077
nft_del_setelem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr)7078 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7079 const struct nlattr *attr)
7080 {
7081 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7082 struct nft_set_ext_tmpl tmpl;
7083 struct nft_set_elem elem;
7084 struct nft_set_ext *ext;
7085 struct nft_trans *trans;
7086 u32 flags = 0;
7087 int err;
7088
7089 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7090 nft_set_elem_policy, NULL);
7091 if (err < 0)
7092 return err;
7093
7094 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7095 if (err < 0)
7096 return err;
7097
7098 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7099 return -EINVAL;
7100
7101 if (!nft_setelem_valid_key_end(set, nla, flags))
7102 return -EINVAL;
7103
7104 nft_set_ext_prepare(&tmpl);
7105
7106 if (flags != 0) {
7107 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7108 if (err < 0)
7109 return err;
7110 }
7111
7112 if (nla[NFTA_SET_ELEM_KEY]) {
7113 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7114 nla[NFTA_SET_ELEM_KEY]);
7115 if (err < 0)
7116 return err;
7117
7118 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7119 if (err < 0)
7120 goto fail_elem;
7121 }
7122
7123 if (nla[NFTA_SET_ELEM_KEY_END]) {
7124 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7125 nla[NFTA_SET_ELEM_KEY_END]);
7126 if (err < 0)
7127 goto fail_elem;
7128
7129 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7130 if (err < 0)
7131 goto fail_elem_key_end;
7132 }
7133
7134 err = -ENOMEM;
7135 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7136 elem.key_end.val.data, NULL, 0, 0,
7137 GFP_KERNEL_ACCOUNT);
7138 if (IS_ERR(elem.priv)) {
7139 err = PTR_ERR(elem.priv);
7140 goto fail_elem_key_end;
7141 }
7142
7143 ext = nft_set_elem_ext(set, elem.priv);
7144 if (flags)
7145 *nft_set_ext_flags(ext) = flags;
7146
7147 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7148 if (trans == NULL)
7149 goto fail_trans;
7150
7151 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7152 if (err < 0)
7153 goto fail_ops;
7154
7155 nft_setelem_data_deactivate(ctx->net, set, &elem);
7156
7157 nft_trans_elem(trans) = elem;
7158 nft_trans_commit_list_add_tail(ctx->net, trans);
7159 return 0;
7160
7161 fail_ops:
7162 kfree(trans);
7163 fail_trans:
7164 kfree(elem.priv);
7165 fail_elem_key_end:
7166 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7167 fail_elem:
7168 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7169 return err;
7170 }
7171
nft_setelem_flush(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)7172 static int nft_setelem_flush(const struct nft_ctx *ctx,
7173 struct nft_set *set,
7174 const struct nft_set_iter *iter,
7175 struct nft_set_elem *elem)
7176 {
7177 struct nft_trans *trans;
7178 int err;
7179
7180 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7181 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7182 if (!trans)
7183 return -ENOMEM;
7184
7185 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7186 err = -ENOENT;
7187 goto err1;
7188 }
7189 set->ndeact++;
7190
7191 nft_setelem_data_deactivate(ctx->net, set, elem);
7192 nft_trans_elem_set(trans) = set;
7193 nft_trans_elem(trans) = *elem;
7194 nft_trans_commit_list_add_tail(ctx->net, trans);
7195
7196 return 0;
7197 err1:
7198 kfree(trans);
7199 return err;
7200 }
7201
__nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)7202 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7203 struct nft_set *set,
7204 struct nft_set_elem *elem)
7205 {
7206 struct nft_trans *trans;
7207
7208 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7209 sizeof(struct nft_trans_elem), GFP_KERNEL);
7210 if (!trans)
7211 return -ENOMEM;
7212
7213 nft_setelem_data_deactivate(ctx->net, set, elem);
7214 nft_trans_elem_set(trans) = set;
7215 nft_trans_elem(trans) = *elem;
7216 nft_trans_commit_list_add_tail(ctx->net, trans);
7217
7218 return 0;
7219 }
7220
nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set)7221 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7222 struct nft_set *set)
7223 {
7224 u8 genmask = nft_genmask_next(ctx->net);
7225 struct nft_set_elem_catchall *catchall;
7226 struct nft_set_elem elem;
7227 struct nft_set_ext *ext;
7228 int ret = 0;
7229
7230 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7231 ext = nft_set_elem_ext(set, catchall->elem);
7232 if (!nft_set_elem_active(ext, genmask))
7233 continue;
7234
7235 elem.priv = catchall->elem;
7236 ret = __nft_set_catchall_flush(ctx, set, &elem);
7237 if (ret < 0)
7238 break;
7239 nft_set_elem_change_active(ctx->net, set, ext);
7240 }
7241
7242 return ret;
7243 }
7244
nft_set_flush(struct nft_ctx * ctx,struct nft_set * set,u8 genmask)7245 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7246 {
7247 struct nft_set_iter iter = {
7248 .genmask = genmask,
7249 .fn = nft_setelem_flush,
7250 };
7251
7252 set->ops->walk(ctx, set, &iter);
7253 if (!iter.err)
7254 iter.err = nft_set_catchall_flush(ctx, set);
7255
7256 return iter.err;
7257 }
7258
nf_tables_delsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7259 static int nf_tables_delsetelem(struct sk_buff *skb,
7260 const struct nfnl_info *info,
7261 const struct nlattr * const nla[])
7262 {
7263 struct netlink_ext_ack *extack = info->extack;
7264 u8 genmask = nft_genmask_next(info->net);
7265 u8 family = info->nfmsg->nfgen_family;
7266 struct net *net = info->net;
7267 const struct nlattr *attr;
7268 struct nft_table *table;
7269 struct nft_set *set;
7270 struct nft_ctx ctx;
7271 int rem, err = 0;
7272
7273 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7274 genmask, NETLINK_CB(skb).portid);
7275 if (IS_ERR(table)) {
7276 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7277 return PTR_ERR(table);
7278 }
7279
7280 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7281 if (IS_ERR(set))
7282 return PTR_ERR(set);
7283
7284 if (nft_set_is_anonymous(set))
7285 return -EOPNOTSUPP;
7286
7287 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7288 return -EBUSY;
7289
7290 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7291
7292 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7293 return nft_set_flush(&ctx, set, genmask);
7294
7295 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7296 err = nft_del_setelem(&ctx, set, attr);
7297 if (err == -ENOENT &&
7298 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7299 continue;
7300
7301 if (err < 0) {
7302 NL_SET_BAD_ATTR(extack, attr);
7303 return err;
7304 }
7305 }
7306
7307 return 0;
7308 }
7309
7310 /*
7311 * Stateful objects
7312 */
7313
7314 /**
7315 * nft_register_obj- register nf_tables stateful object type
7316 * @obj_type: object type
7317 *
7318 * Registers the object type for use with nf_tables. Returns zero on
7319 * success or a negative errno code otherwise.
7320 */
nft_register_obj(struct nft_object_type * obj_type)7321 int nft_register_obj(struct nft_object_type *obj_type)
7322 {
7323 if (obj_type->type == NFT_OBJECT_UNSPEC)
7324 return -EINVAL;
7325
7326 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7327 list_add_rcu(&obj_type->list, &nf_tables_objects);
7328 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7329 return 0;
7330 }
7331 EXPORT_SYMBOL_GPL(nft_register_obj);
7332
7333 /**
7334 * nft_unregister_obj - unregister nf_tables object type
7335 * @obj_type: object type
7336 *
7337 * Unregisters the object type for use with nf_tables.
7338 */
nft_unregister_obj(struct nft_object_type * obj_type)7339 void nft_unregister_obj(struct nft_object_type *obj_type)
7340 {
7341 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7342 list_del_rcu(&obj_type->list);
7343 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7344 }
7345 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7346
nft_obj_lookup(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7347 struct nft_object *nft_obj_lookup(const struct net *net,
7348 const struct nft_table *table,
7349 const struct nlattr *nla, u32 objtype,
7350 u8 genmask)
7351 {
7352 struct nft_object_hash_key k = { .table = table };
7353 char search[NFT_OBJ_MAXNAMELEN];
7354 struct rhlist_head *tmp, *list;
7355 struct nft_object *obj;
7356
7357 nla_strscpy(search, nla, sizeof(search));
7358 k.name = search;
7359
7360 WARN_ON_ONCE(!rcu_read_lock_held() &&
7361 !lockdep_commit_lock_is_held(net));
7362
7363 rcu_read_lock();
7364 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7365 if (!list)
7366 goto out;
7367
7368 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7369 if (objtype == obj->ops->type->type &&
7370 nft_active_genmask(obj, genmask)) {
7371 rcu_read_unlock();
7372 return obj;
7373 }
7374 }
7375 out:
7376 rcu_read_unlock();
7377 return ERR_PTR(-ENOENT);
7378 }
7379 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7380
nft_obj_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7381 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7382 const struct nlattr *nla,
7383 u32 objtype, u8 genmask)
7384 {
7385 struct nft_object *obj;
7386
7387 list_for_each_entry(obj, &table->objects, list) {
7388 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7389 objtype == obj->ops->type->type &&
7390 nft_active_genmask(obj, genmask))
7391 return obj;
7392 }
7393 return ERR_PTR(-ENOENT);
7394 }
7395
7396 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7397 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7398 .len = NFT_TABLE_MAXNAMELEN - 1 },
7399 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7400 .len = NFT_OBJ_MAXNAMELEN - 1 },
7401 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7402 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7403 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7404 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7405 .len = NFT_USERDATA_MAXLEN },
7406 };
7407
nft_obj_init(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr)7408 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7409 const struct nft_object_type *type,
7410 const struct nlattr *attr)
7411 {
7412 struct nlattr **tb;
7413 const struct nft_object_ops *ops;
7414 struct nft_object *obj;
7415 int err = -ENOMEM;
7416
7417 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7418 if (!tb)
7419 goto err1;
7420
7421 if (attr) {
7422 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7423 type->policy, NULL);
7424 if (err < 0)
7425 goto err2;
7426 } else {
7427 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7428 }
7429
7430 if (type->select_ops) {
7431 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7432 if (IS_ERR(ops)) {
7433 err = PTR_ERR(ops);
7434 goto err2;
7435 }
7436 } else {
7437 ops = type->ops;
7438 }
7439
7440 err = -ENOMEM;
7441 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7442 if (!obj)
7443 goto err2;
7444
7445 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7446 if (err < 0)
7447 goto err3;
7448
7449 obj->ops = ops;
7450
7451 kfree(tb);
7452 return obj;
7453 err3:
7454 kfree(obj);
7455 err2:
7456 kfree(tb);
7457 err1:
7458 return ERR_PTR(err);
7459 }
7460
nft_object_dump(struct sk_buff * skb,unsigned int attr,struct nft_object * obj,bool reset)7461 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7462 struct nft_object *obj, bool reset)
7463 {
7464 struct nlattr *nest;
7465
7466 nest = nla_nest_start_noflag(skb, attr);
7467 if (!nest)
7468 goto nla_put_failure;
7469 if (obj->ops->dump(skb, obj, reset) < 0)
7470 goto nla_put_failure;
7471 nla_nest_end(skb, nest);
7472 return 0;
7473
7474 nla_put_failure:
7475 return -1;
7476 }
7477
__nft_obj_type_get(u32 objtype,u8 family)7478 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7479 {
7480 const struct nft_object_type *type;
7481
7482 list_for_each_entry_rcu(type, &nf_tables_objects, list) {
7483 if (type->family != NFPROTO_UNSPEC &&
7484 type->family != family)
7485 continue;
7486
7487 if (objtype == type->type)
7488 return type;
7489 }
7490 return NULL;
7491 }
7492
7493 static const struct nft_object_type *
nft_obj_type_get(struct net * net,u32 objtype,u8 family)7494 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7495 {
7496 const struct nft_object_type *type;
7497
7498 rcu_read_lock();
7499 type = __nft_obj_type_get(objtype, family);
7500 if (type != NULL && try_module_get(type->owner)) {
7501 rcu_read_unlock();
7502 return type;
7503 }
7504 rcu_read_unlock();
7505
7506 lockdep_nfnl_nft_mutex_not_held();
7507 #ifdef CONFIG_MODULES
7508 if (type == NULL) {
7509 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7510 return ERR_PTR(-EAGAIN);
7511 }
7512 #endif
7513 return ERR_PTR(-ENOENT);
7514 }
7515
nf_tables_updobj(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr,struct nft_object * obj)7516 static int nf_tables_updobj(const struct nft_ctx *ctx,
7517 const struct nft_object_type *type,
7518 const struct nlattr *attr,
7519 struct nft_object *obj)
7520 {
7521 struct nft_object *newobj;
7522 struct nft_trans *trans;
7523 int err = -ENOMEM;
7524
7525 if (!try_module_get(type->owner))
7526 return -ENOENT;
7527
7528 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7529 sizeof(struct nft_trans_obj));
7530 if (!trans)
7531 goto err_trans;
7532
7533 newobj = nft_obj_init(ctx, type, attr);
7534 if (IS_ERR(newobj)) {
7535 err = PTR_ERR(newobj);
7536 goto err_free_trans;
7537 }
7538
7539 nft_trans_obj(trans) = obj;
7540 nft_trans_obj_update(trans) = true;
7541 nft_trans_obj_newobj(trans) = newobj;
7542 nft_trans_commit_list_add_tail(ctx->net, trans);
7543
7544 return 0;
7545
7546 err_free_trans:
7547 kfree(trans);
7548 err_trans:
7549 module_put(type->owner);
7550 return err;
7551 }
7552
nf_tables_newobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7553 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7554 const struct nlattr * const nla[])
7555 {
7556 struct netlink_ext_ack *extack = info->extack;
7557 u8 genmask = nft_genmask_next(info->net);
7558 u8 family = info->nfmsg->nfgen_family;
7559 const struct nft_object_type *type;
7560 struct net *net = info->net;
7561 struct nft_table *table;
7562 struct nft_object *obj;
7563 struct nft_ctx ctx;
7564 u32 objtype;
7565 int err;
7566
7567 if (!nla[NFTA_OBJ_TYPE] ||
7568 !nla[NFTA_OBJ_NAME] ||
7569 !nla[NFTA_OBJ_DATA])
7570 return -EINVAL;
7571
7572 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7573 NETLINK_CB(skb).portid);
7574 if (IS_ERR(table)) {
7575 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7576 return PTR_ERR(table);
7577 }
7578
7579 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7580 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7581 if (IS_ERR(obj)) {
7582 err = PTR_ERR(obj);
7583 if (err != -ENOENT) {
7584 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7585 return err;
7586 }
7587 } else {
7588 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7589 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7590 return -EEXIST;
7591 }
7592 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7593 return -EOPNOTSUPP;
7594
7595 type = __nft_obj_type_get(objtype, family);
7596 if (WARN_ON_ONCE(!type))
7597 return -ENOENT;
7598
7599 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7600
7601 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7602 }
7603
7604 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7605
7606 if (!nft_use_inc(&table->use))
7607 return -EMFILE;
7608
7609 type = nft_obj_type_get(net, objtype, family);
7610 if (IS_ERR(type)) {
7611 err = PTR_ERR(type);
7612 goto err_type;
7613 }
7614
7615 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7616 if (IS_ERR(obj)) {
7617 err = PTR_ERR(obj);
7618 goto err_init;
7619 }
7620 obj->key.table = table;
7621 obj->handle = nf_tables_alloc_handle(table);
7622
7623 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7624 if (!obj->key.name) {
7625 err = -ENOMEM;
7626 goto err_strdup;
7627 }
7628
7629 if (nla[NFTA_OBJ_USERDATA]) {
7630 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7631 if (obj->udata == NULL)
7632 goto err_userdata;
7633
7634 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7635 }
7636
7637 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7638 if (err < 0)
7639 goto err_trans;
7640
7641 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7642 nft_objname_ht_params);
7643 if (err < 0)
7644 goto err_obj_ht;
7645
7646 list_add_tail_rcu(&obj->list, &table->objects);
7647
7648 return 0;
7649 err_obj_ht:
7650 /* queued in transaction log */
7651 INIT_LIST_HEAD(&obj->list);
7652 return err;
7653 err_trans:
7654 kfree(obj->udata);
7655 err_userdata:
7656 kfree(obj->key.name);
7657 err_strdup:
7658 if (obj->ops->destroy)
7659 obj->ops->destroy(&ctx, obj);
7660 kfree(obj);
7661 err_init:
7662 module_put(type->owner);
7663 err_type:
7664 nft_use_dec_restore(&table->use);
7665
7666 return err;
7667 }
7668
nf_tables_fill_obj_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,const struct nft_table * table,struct nft_object * obj,bool reset)7669 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7670 u32 portid, u32 seq, int event, u32 flags,
7671 int family, const struct nft_table *table,
7672 struct nft_object *obj, bool reset)
7673 {
7674 struct nlmsghdr *nlh;
7675
7676 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7677 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7678 NFNETLINK_V0, nft_base_seq(net));
7679 if (!nlh)
7680 goto nla_put_failure;
7681
7682 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7683 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7684 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7685 NFTA_OBJ_PAD))
7686 goto nla_put_failure;
7687
7688 if (event == NFT_MSG_DELOBJ) {
7689 nlmsg_end(skb, nlh);
7690 return 0;
7691 }
7692
7693 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7694 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7695 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7696 goto nla_put_failure;
7697
7698 if (obj->udata &&
7699 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7700 goto nla_put_failure;
7701
7702 nlmsg_end(skb, nlh);
7703 return 0;
7704
7705 nla_put_failure:
7706 nlmsg_trim(skb, nlh);
7707 return -1;
7708 }
7709
audit_log_obj_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)7710 static void audit_log_obj_reset(const struct nft_table *table,
7711 unsigned int base_seq, unsigned int nentries)
7712 {
7713 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7714
7715 audit_log_nfcfg(buf, table->family, nentries,
7716 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7717 kfree(buf);
7718 }
7719
7720 struct nft_obj_dump_ctx {
7721 unsigned int s_idx;
7722 char *table;
7723 u32 type;
7724 bool reset;
7725 };
7726
nf_tables_dump_obj(struct sk_buff * skb,struct netlink_callback * cb)7727 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7728 {
7729 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7730 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7731 struct net *net = sock_net(skb->sk);
7732 int family = nfmsg->nfgen_family;
7733 struct nftables_pernet *nft_net;
7734 const struct nft_table *table;
7735 unsigned int entries = 0;
7736 struct nft_object *obj;
7737 unsigned int idx = 0;
7738 int rc = 0;
7739
7740 rcu_read_lock();
7741 nft_net = nft_pernet(net);
7742 cb->seq = READ_ONCE(nft_net->base_seq);
7743
7744 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7745 if (family != NFPROTO_UNSPEC && family != table->family)
7746 continue;
7747
7748 entries = 0;
7749 list_for_each_entry_rcu(obj, &table->objects, list) {
7750 if (!nft_is_active(net, obj))
7751 goto cont;
7752 if (idx < ctx->s_idx)
7753 goto cont;
7754 if (ctx->table && strcmp(ctx->table, table->name))
7755 goto cont;
7756 if (ctx->type != NFT_OBJECT_UNSPEC &&
7757 obj->ops->type->type != ctx->type)
7758 goto cont;
7759
7760 rc = nf_tables_fill_obj_info(skb, net,
7761 NETLINK_CB(cb->skb).portid,
7762 cb->nlh->nlmsg_seq,
7763 NFT_MSG_NEWOBJ,
7764 NLM_F_MULTI | NLM_F_APPEND,
7765 table->family, table,
7766 obj, ctx->reset);
7767 if (rc < 0)
7768 break;
7769
7770 entries++;
7771 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7772 cont:
7773 idx++;
7774 }
7775 if (ctx->reset && entries)
7776 audit_log_obj_reset(table, nft_net->base_seq, entries);
7777 if (rc < 0)
7778 break;
7779 }
7780 rcu_read_unlock();
7781
7782 ctx->s_idx = idx;
7783 return skb->len;
7784 }
7785
nf_tables_dumpreset_obj(struct sk_buff * skb,struct netlink_callback * cb)7786 static int nf_tables_dumpreset_obj(struct sk_buff *skb,
7787 struct netlink_callback *cb)
7788 {
7789 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
7790 int ret;
7791
7792 mutex_lock(&nft_net->commit_mutex);
7793 ret = nf_tables_dump_obj(skb, cb);
7794 mutex_unlock(&nft_net->commit_mutex);
7795
7796 return ret;
7797 }
7798
nf_tables_dump_obj_start(struct netlink_callback * cb)7799 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7800 {
7801 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7802 const struct nlattr * const *nla = cb->data;
7803
7804 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7805
7806 if (nla[NFTA_OBJ_TABLE]) {
7807 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7808 if (!ctx->table)
7809 return -ENOMEM;
7810 }
7811
7812 if (nla[NFTA_OBJ_TYPE])
7813 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7814
7815 return 0;
7816 }
7817
nf_tables_dumpreset_obj_start(struct netlink_callback * cb)7818 static int nf_tables_dumpreset_obj_start(struct netlink_callback *cb)
7819 {
7820 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7821
7822 ctx->reset = true;
7823
7824 return nf_tables_dump_obj_start(cb);
7825 }
7826
nf_tables_dump_obj_done(struct netlink_callback * cb)7827 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7828 {
7829 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7830
7831 kfree(ctx->table);
7832
7833 return 0;
7834 }
7835
7836 /* called with rcu_read_lock held */
7837 static struct sk_buff *
nf_tables_getobj_single(u32 portid,const struct nfnl_info * info,const struct nlattr * const nla[],bool reset)7838 nf_tables_getobj_single(u32 portid, const struct nfnl_info *info,
7839 const struct nlattr * const nla[], bool reset)
7840 {
7841 struct netlink_ext_ack *extack = info->extack;
7842 u8 genmask = nft_genmask_cur(info->net);
7843 u8 family = info->nfmsg->nfgen_family;
7844 const struct nft_table *table;
7845 struct net *net = info->net;
7846 struct nft_object *obj;
7847 struct sk_buff *skb2;
7848 u32 objtype;
7849 int err;
7850
7851 if (!nla[NFTA_OBJ_NAME] ||
7852 !nla[NFTA_OBJ_TYPE])
7853 return ERR_PTR(-EINVAL);
7854
7855 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7856 if (IS_ERR(table)) {
7857 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7858 return ERR_CAST(table);
7859 }
7860
7861 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7862 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7863 if (IS_ERR(obj)) {
7864 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7865 return ERR_CAST(obj);
7866 }
7867
7868 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7869 if (!skb2)
7870 return ERR_PTR(-ENOMEM);
7871
7872 err = nf_tables_fill_obj_info(skb2, net, portid,
7873 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7874 family, table, obj, reset);
7875 if (err < 0) {
7876 kfree_skb(skb2);
7877 return ERR_PTR(err);
7878 }
7879
7880 return skb2;
7881 }
7882
nf_tables_getobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7883 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7884 const struct nlattr * const nla[])
7885 {
7886 u32 portid = NETLINK_CB(skb).portid;
7887 struct sk_buff *skb2;
7888
7889 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7890 struct netlink_dump_control c = {
7891 .start = nf_tables_dump_obj_start,
7892 .dump = nf_tables_dump_obj,
7893 .done = nf_tables_dump_obj_done,
7894 .module = THIS_MODULE,
7895 .data = (void *)nla,
7896 };
7897
7898 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7899 }
7900
7901 skb2 = nf_tables_getobj_single(portid, info, nla, false);
7902 if (IS_ERR(skb2))
7903 return PTR_ERR(skb2);
7904
7905 return nfnetlink_unicast(skb2, info->net, portid);
7906 }
7907
nf_tables_getobj_reset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7908 static int nf_tables_getobj_reset(struct sk_buff *skb,
7909 const struct nfnl_info *info,
7910 const struct nlattr * const nla[])
7911 {
7912 struct nftables_pernet *nft_net = nft_pernet(info->net);
7913 u32 portid = NETLINK_CB(skb).portid;
7914 struct net *net = info->net;
7915 struct sk_buff *skb2;
7916 char *buf;
7917
7918 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7919 struct netlink_dump_control c = {
7920 .start = nf_tables_dumpreset_obj_start,
7921 .dump = nf_tables_dumpreset_obj,
7922 .done = nf_tables_dump_obj_done,
7923 .module = THIS_MODULE,
7924 .data = (void *)nla,
7925 };
7926
7927 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7928 }
7929
7930 if (!try_module_get(THIS_MODULE))
7931 return -EINVAL;
7932 rcu_read_unlock();
7933 mutex_lock(&nft_net->commit_mutex);
7934 skb2 = nf_tables_getobj_single(portid, info, nla, true);
7935 mutex_unlock(&nft_net->commit_mutex);
7936 rcu_read_lock();
7937 module_put(THIS_MODULE);
7938
7939 if (IS_ERR(skb2))
7940 return PTR_ERR(skb2);
7941
7942 buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
7943 nla_len(nla[NFTA_OBJ_TABLE]),
7944 (char *)nla_data(nla[NFTA_OBJ_TABLE]),
7945 nft_net->base_seq);
7946 audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
7947 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7948 kfree(buf);
7949
7950 return nfnetlink_unicast(skb2, net, portid);
7951 }
7952
nft_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)7953 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7954 {
7955 if (obj->ops->destroy)
7956 obj->ops->destroy(ctx, obj);
7957
7958 module_put(obj->ops->type->owner);
7959 kfree(obj->key.name);
7960 kfree(obj->udata);
7961 kfree(obj);
7962 }
7963
nf_tables_delobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7964 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7965 const struct nlattr * const nla[])
7966 {
7967 struct netlink_ext_ack *extack = info->extack;
7968 u8 genmask = nft_genmask_next(info->net);
7969 u8 family = info->nfmsg->nfgen_family;
7970 struct net *net = info->net;
7971 const struct nlattr *attr;
7972 struct nft_table *table;
7973 struct nft_object *obj;
7974 struct nft_ctx ctx;
7975 u32 objtype;
7976
7977 if (!nla[NFTA_OBJ_TYPE] ||
7978 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7979 return -EINVAL;
7980
7981 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7982 NETLINK_CB(skb).portid);
7983 if (IS_ERR(table)) {
7984 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7985 return PTR_ERR(table);
7986 }
7987
7988 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7989 if (nla[NFTA_OBJ_HANDLE]) {
7990 attr = nla[NFTA_OBJ_HANDLE];
7991 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7992 } else {
7993 attr = nla[NFTA_OBJ_NAME];
7994 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7995 }
7996
7997 if (IS_ERR(obj)) {
7998 if (PTR_ERR(obj) == -ENOENT &&
7999 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8000 return 0;
8001
8002 NL_SET_BAD_ATTR(extack, attr);
8003 return PTR_ERR(obj);
8004 }
8005 if (obj->use > 0) {
8006 NL_SET_BAD_ATTR(extack, attr);
8007 return -EBUSY;
8008 }
8009
8010 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8011
8012 return nft_delobj(&ctx, obj);
8013 }
8014
8015 static void
__nft_obj_notify(struct net * net,const struct nft_table * table,struct nft_object * obj,u32 portid,u32 seq,int event,u16 flags,int family,int report,gfp_t gfp)8016 __nft_obj_notify(struct net *net, const struct nft_table *table,
8017 struct nft_object *obj, u32 portid, u32 seq, int event,
8018 u16 flags, int family, int report, gfp_t gfp)
8019 {
8020 struct nftables_pernet *nft_net = nft_pernet(net);
8021 struct sk_buff *skb;
8022 int err;
8023
8024 if (!report &&
8025 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8026 return;
8027
8028 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8029 if (skb == NULL)
8030 goto err;
8031
8032 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8033 flags & (NLM_F_CREATE | NLM_F_EXCL),
8034 family, table, obj, false);
8035 if (err < 0) {
8036 kfree_skb(skb);
8037 goto err;
8038 }
8039
8040 nft_notify_enqueue(skb, report, &nft_net->notify_list);
8041 return;
8042 err:
8043 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8044 }
8045
nft_obj_notify(struct net * net,const struct nft_table * table,struct nft_object * obj,u32 portid,u32 seq,int event,u16 flags,int family,int report,gfp_t gfp)8046 void nft_obj_notify(struct net *net, const struct nft_table *table,
8047 struct nft_object *obj, u32 portid, u32 seq, int event,
8048 u16 flags, int family, int report, gfp_t gfp)
8049 {
8050 struct nftables_pernet *nft_net = nft_pernet(net);
8051 char *buf = kasprintf(gfp, "%s:%u",
8052 table->name, nft_net->base_seq);
8053
8054 audit_log_nfcfg(buf,
8055 family,
8056 obj->handle,
8057 event == NFT_MSG_NEWOBJ ?
8058 AUDIT_NFT_OP_OBJ_REGISTER :
8059 AUDIT_NFT_OP_OBJ_UNREGISTER,
8060 gfp);
8061 kfree(buf);
8062
8063 __nft_obj_notify(net, table, obj, portid, seq, event,
8064 flags, family, report, gfp);
8065 }
8066 EXPORT_SYMBOL_GPL(nft_obj_notify);
8067
nf_tables_obj_notify(const struct nft_ctx * ctx,struct nft_object * obj,int event)8068 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8069 struct nft_object *obj, int event)
8070 {
8071 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8072 ctx->seq, event, ctx->flags, ctx->family,
8073 ctx->report, GFP_KERNEL);
8074 }
8075
8076 /*
8077 * Flow tables
8078 */
nft_register_flowtable_type(struct nf_flowtable_type * type)8079 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8080 {
8081 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8082 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8083 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8084 }
8085 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8086
nft_unregister_flowtable_type(struct nf_flowtable_type * type)8087 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8088 {
8089 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8090 list_del_rcu(&type->list);
8091 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8092 }
8093 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8094
8095 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8096 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
8097 .len = NFT_NAME_MAXLEN - 1 },
8098 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
8099 .len = NFT_NAME_MAXLEN - 1 },
8100 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
8101 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8102 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
8103 };
8104
nft_flowtable_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8105 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8106 const struct nlattr *nla, u8 genmask)
8107 {
8108 struct nft_flowtable *flowtable;
8109
8110 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8111 if (!nla_strcmp(nla, flowtable->name) &&
8112 nft_active_genmask(flowtable, genmask))
8113 return flowtable;
8114 }
8115 return ERR_PTR(-ENOENT);
8116 }
8117 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8118
nf_tables_deactivate_flowtable(const struct nft_ctx * ctx,struct nft_flowtable * flowtable,enum nft_trans_phase phase)8119 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8120 struct nft_flowtable *flowtable,
8121 enum nft_trans_phase phase)
8122 {
8123 switch (phase) {
8124 case NFT_TRANS_PREPARE_ERROR:
8125 case NFT_TRANS_PREPARE:
8126 case NFT_TRANS_ABORT:
8127 case NFT_TRANS_RELEASE:
8128 nft_use_dec(&flowtable->use);
8129 fallthrough;
8130 default:
8131 return;
8132 }
8133 }
8134 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8135
8136 static struct nft_flowtable *
nft_flowtable_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8137 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8138 const struct nlattr *nla, u8 genmask)
8139 {
8140 struct nft_flowtable *flowtable;
8141
8142 list_for_each_entry(flowtable, &table->flowtables, list) {
8143 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8144 nft_active_genmask(flowtable, genmask))
8145 return flowtable;
8146 }
8147 return ERR_PTR(-ENOENT);
8148 }
8149
8150 struct nft_flowtable_hook {
8151 u32 num;
8152 int priority;
8153 struct list_head list;
8154 };
8155
8156 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8157 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8158 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8159 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8160 };
8161
nft_flowtable_parse_hook(const struct nft_ctx * ctx,const struct nlattr * const nla[],struct nft_flowtable_hook * flowtable_hook,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack,bool add)8162 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8163 const struct nlattr * const nla[],
8164 struct nft_flowtable_hook *flowtable_hook,
8165 struct nft_flowtable *flowtable,
8166 struct netlink_ext_ack *extack, bool add)
8167 {
8168 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8169 struct nft_hook *hook;
8170 int hooknum, priority;
8171 int err;
8172
8173 INIT_LIST_HEAD(&flowtable_hook->list);
8174
8175 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8176 nla[NFTA_FLOWTABLE_HOOK],
8177 nft_flowtable_hook_policy, NULL);
8178 if (err < 0)
8179 return err;
8180
8181 if (add) {
8182 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8183 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8184 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8185 return -ENOENT;
8186 }
8187
8188 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8189 if (hooknum != NF_NETDEV_INGRESS)
8190 return -EOPNOTSUPP;
8191
8192 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8193
8194 flowtable_hook->priority = priority;
8195 flowtable_hook->num = hooknum;
8196 } else {
8197 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8198 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8199 if (hooknum != flowtable->hooknum)
8200 return -EOPNOTSUPP;
8201 }
8202
8203 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8204 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8205 if (priority != flowtable->data.priority)
8206 return -EOPNOTSUPP;
8207 }
8208
8209 flowtable_hook->priority = flowtable->data.priority;
8210 flowtable_hook->num = flowtable->hooknum;
8211 }
8212
8213 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8214 err = nf_tables_parse_netdev_hooks(ctx->net,
8215 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8216 &flowtable_hook->list,
8217 extack);
8218 if (err < 0)
8219 return err;
8220 }
8221
8222 list_for_each_entry(hook, &flowtable_hook->list, list) {
8223 hook->ops.pf = NFPROTO_NETDEV;
8224 hook->ops.hooknum = flowtable_hook->num;
8225 hook->ops.priority = flowtable_hook->priority;
8226 hook->ops.priv = &flowtable->data;
8227 hook->ops.hook = flowtable->data.type->hook;
8228 }
8229
8230 return err;
8231 }
8232
8233 /* call under rcu_read_lock */
__nft_flowtable_type_get(u8 family)8234 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8235 {
8236 const struct nf_flowtable_type *type;
8237
8238 list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
8239 if (family == type->family)
8240 return type;
8241 }
8242 return NULL;
8243 }
8244
8245 static const struct nf_flowtable_type *
nft_flowtable_type_get(struct net * net,u8 family)8246 nft_flowtable_type_get(struct net *net, u8 family)
8247 {
8248 const struct nf_flowtable_type *type;
8249
8250 rcu_read_lock();
8251 type = __nft_flowtable_type_get(family);
8252 if (type != NULL && try_module_get(type->owner)) {
8253 rcu_read_unlock();
8254 return type;
8255 }
8256 rcu_read_unlock();
8257
8258 lockdep_nfnl_nft_mutex_not_held();
8259 #ifdef CONFIG_MODULES
8260 if (type == NULL) {
8261 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8262 return ERR_PTR(-EAGAIN);
8263 }
8264 #endif
8265 return ERR_PTR(-ENOENT);
8266 }
8267
8268 /* Only called from error and netdev event paths. */
nft_unregister_flowtable_hook(struct net * net,struct nft_flowtable * flowtable,struct nft_hook * hook)8269 static void nft_unregister_flowtable_hook(struct net *net,
8270 struct nft_flowtable *flowtable,
8271 struct nft_hook *hook)
8272 {
8273 nf_unregister_net_hook(net, &hook->ops);
8274 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8275 FLOW_BLOCK_UNBIND);
8276 }
8277
__nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)8278 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8279 struct list_head *hook_list,
8280 bool release_netdev)
8281 {
8282 struct nft_hook *hook, *next;
8283
8284 list_for_each_entry_safe(hook, next, hook_list, list) {
8285 nf_unregister_net_hook(net, &hook->ops);
8286 if (release_netdev) {
8287 list_del(&hook->list);
8288 kfree_rcu(hook, rcu);
8289 }
8290 }
8291 }
8292
nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list)8293 static void nft_unregister_flowtable_net_hooks(struct net *net,
8294 struct list_head *hook_list)
8295 {
8296 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8297 }
8298
nft_register_flowtable_net_hooks(struct net * net,struct nft_table * table,struct list_head * hook_list,struct nft_flowtable * flowtable)8299 static int nft_register_flowtable_net_hooks(struct net *net,
8300 struct nft_table *table,
8301 struct list_head *hook_list,
8302 struct nft_flowtable *flowtable)
8303 {
8304 struct nft_hook *hook, *hook2, *next;
8305 struct nft_flowtable *ft;
8306 int err, i = 0;
8307
8308 list_for_each_entry(hook, hook_list, list) {
8309 list_for_each_entry(ft, &table->flowtables, list) {
8310 if (!nft_is_active_next(net, ft))
8311 continue;
8312
8313 list_for_each_entry(hook2, &ft->hook_list, list) {
8314 if (hook->ops.dev == hook2->ops.dev &&
8315 hook->ops.pf == hook2->ops.pf) {
8316 err = -EEXIST;
8317 goto err_unregister_net_hooks;
8318 }
8319 }
8320 }
8321
8322 err = flowtable->data.type->setup(&flowtable->data,
8323 hook->ops.dev,
8324 FLOW_BLOCK_BIND);
8325 if (err < 0)
8326 goto err_unregister_net_hooks;
8327
8328 err = nf_register_net_hook(net, &hook->ops);
8329 if (err < 0) {
8330 flowtable->data.type->setup(&flowtable->data,
8331 hook->ops.dev,
8332 FLOW_BLOCK_UNBIND);
8333 goto err_unregister_net_hooks;
8334 }
8335
8336 i++;
8337 }
8338
8339 return 0;
8340
8341 err_unregister_net_hooks:
8342 list_for_each_entry_safe(hook, next, hook_list, list) {
8343 if (i-- <= 0)
8344 break;
8345
8346 nft_unregister_flowtable_hook(net, flowtable, hook);
8347 list_del_rcu(&hook->list);
8348 kfree_rcu(hook, rcu);
8349 }
8350
8351 return err;
8352 }
8353
nft_hooks_destroy(struct list_head * hook_list)8354 static void nft_hooks_destroy(struct list_head *hook_list)
8355 {
8356 struct nft_hook *hook, *next;
8357
8358 list_for_each_entry_safe(hook, next, hook_list, list) {
8359 list_del_rcu(&hook->list);
8360 kfree_rcu(hook, rcu);
8361 }
8362 }
8363
nft_flowtable_update(struct nft_ctx * ctx,const struct nlmsghdr * nlh,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8364 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8365 struct nft_flowtable *flowtable,
8366 struct netlink_ext_ack *extack)
8367 {
8368 const struct nlattr * const *nla = ctx->nla;
8369 struct nft_flowtable_hook flowtable_hook;
8370 struct nft_hook *hook, *next;
8371 struct nft_trans *trans;
8372 bool unregister = false;
8373 u32 flags;
8374 int err;
8375
8376 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8377 extack, false);
8378 if (err < 0)
8379 return err;
8380
8381 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8382 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8383 list_del(&hook->list);
8384 kfree(hook);
8385 }
8386 }
8387
8388 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8389 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8390 if (flags & ~NFT_FLOWTABLE_MASK) {
8391 err = -EOPNOTSUPP;
8392 goto err_flowtable_update_hook;
8393 }
8394 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8395 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8396 err = -EOPNOTSUPP;
8397 goto err_flowtable_update_hook;
8398 }
8399 } else {
8400 flags = flowtable->data.flags;
8401 }
8402
8403 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8404 &flowtable_hook.list, flowtable);
8405 if (err < 0)
8406 goto err_flowtable_update_hook;
8407
8408 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8409 sizeof(struct nft_trans_flowtable));
8410 if (!trans) {
8411 unregister = true;
8412 err = -ENOMEM;
8413 goto err_flowtable_update_hook;
8414 }
8415
8416 nft_trans_flowtable_flags(trans) = flags;
8417 nft_trans_flowtable(trans) = flowtable;
8418 nft_trans_flowtable_update(trans) = true;
8419 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8420 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8421
8422 nft_trans_commit_list_add_tail(ctx->net, trans);
8423
8424 return 0;
8425
8426 err_flowtable_update_hook:
8427 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8428 if (unregister)
8429 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8430 list_del_rcu(&hook->list);
8431 kfree_rcu(hook, rcu);
8432 }
8433
8434 return err;
8435
8436 }
8437
nf_tables_newflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8438 static int nf_tables_newflowtable(struct sk_buff *skb,
8439 const struct nfnl_info *info,
8440 const struct nlattr * const nla[])
8441 {
8442 struct netlink_ext_ack *extack = info->extack;
8443 struct nft_flowtable_hook flowtable_hook;
8444 u8 genmask = nft_genmask_next(info->net);
8445 u8 family = info->nfmsg->nfgen_family;
8446 const struct nf_flowtable_type *type;
8447 struct nft_flowtable *flowtable;
8448 struct net *net = info->net;
8449 struct nft_table *table;
8450 struct nft_trans *trans;
8451 struct nft_ctx ctx;
8452 int err;
8453
8454 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8455 !nla[NFTA_FLOWTABLE_NAME] ||
8456 !nla[NFTA_FLOWTABLE_HOOK])
8457 return -EINVAL;
8458
8459 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8460 genmask, NETLINK_CB(skb).portid);
8461 if (IS_ERR(table)) {
8462 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8463 return PTR_ERR(table);
8464 }
8465
8466 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8467 genmask);
8468 if (IS_ERR(flowtable)) {
8469 err = PTR_ERR(flowtable);
8470 if (err != -ENOENT) {
8471 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8472 return err;
8473 }
8474 } else {
8475 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8476 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8477 return -EEXIST;
8478 }
8479
8480 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8481
8482 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8483 }
8484
8485 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8486
8487 if (!nft_use_inc(&table->use))
8488 return -EMFILE;
8489
8490 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8491 if (!flowtable) {
8492 err = -ENOMEM;
8493 goto flowtable_alloc;
8494 }
8495
8496 flowtable->table = table;
8497 flowtable->handle = nf_tables_alloc_handle(table);
8498 INIT_LIST_HEAD(&flowtable->hook_list);
8499
8500 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8501 if (!flowtable->name) {
8502 err = -ENOMEM;
8503 goto err1;
8504 }
8505
8506 type = nft_flowtable_type_get(net, family);
8507 if (IS_ERR(type)) {
8508 err = PTR_ERR(type);
8509 goto err2;
8510 }
8511
8512 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8513 flowtable->data.flags =
8514 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8515 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8516 err = -EOPNOTSUPP;
8517 goto err3;
8518 }
8519 }
8520
8521 write_pnet(&flowtable->data.net, net);
8522 flowtable->data.type = type;
8523 err = type->init(&flowtable->data);
8524 if (err < 0)
8525 goto err3;
8526
8527 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8528 extack, true);
8529 if (err < 0)
8530 goto err_flowtable_parse_hooks;
8531
8532 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8533 flowtable->data.priority = flowtable_hook.priority;
8534 flowtable->hooknum = flowtable_hook.num;
8535
8536 trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8537 if (IS_ERR(trans)) {
8538 err = PTR_ERR(trans);
8539 goto err_flowtable_trans;
8540 }
8541
8542 /* This must be LAST to ensure no packets are walking over this flowtable. */
8543 err = nft_register_flowtable_net_hooks(ctx.net, table,
8544 &flowtable->hook_list,
8545 flowtable);
8546 if (err < 0)
8547 goto err_flowtable_hooks;
8548
8549 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8550
8551 return 0;
8552
8553 err_flowtable_hooks:
8554 nft_trans_destroy(trans);
8555 err_flowtable_trans:
8556 nft_hooks_destroy(&flowtable->hook_list);
8557 err_flowtable_parse_hooks:
8558 flowtable->data.type->free(&flowtable->data);
8559 err3:
8560 module_put(type->owner);
8561 err2:
8562 kfree(flowtable->name);
8563 err1:
8564 kfree(flowtable);
8565 flowtable_alloc:
8566 nft_use_dec_restore(&table->use);
8567
8568 return err;
8569 }
8570
nft_flowtable_hook_release(struct nft_flowtable_hook * flowtable_hook)8571 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8572 {
8573 struct nft_hook *this, *next;
8574
8575 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8576 list_del(&this->list);
8577 kfree(this);
8578 }
8579 }
8580
nft_delflowtable_hook(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8581 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8582 struct nft_flowtable *flowtable,
8583 struct netlink_ext_ack *extack)
8584 {
8585 const struct nlattr * const *nla = ctx->nla;
8586 struct nft_flowtable_hook flowtable_hook;
8587 LIST_HEAD(flowtable_del_list);
8588 struct nft_hook *this, *hook;
8589 struct nft_trans *trans;
8590 int err;
8591
8592 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8593 extack, false);
8594 if (err < 0)
8595 return err;
8596
8597 list_for_each_entry(this, &flowtable_hook.list, list) {
8598 hook = nft_hook_list_find(&flowtable->hook_list, this);
8599 if (!hook) {
8600 err = -ENOENT;
8601 goto err_flowtable_del_hook;
8602 }
8603 list_move(&hook->list, &flowtable_del_list);
8604 }
8605
8606 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8607 sizeof(struct nft_trans_flowtable));
8608 if (!trans) {
8609 err = -ENOMEM;
8610 goto err_flowtable_del_hook;
8611 }
8612
8613 nft_trans_flowtable(trans) = flowtable;
8614 nft_trans_flowtable_update(trans) = true;
8615 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8616 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8617 nft_flowtable_hook_release(&flowtable_hook);
8618
8619 nft_trans_commit_list_add_tail(ctx->net, trans);
8620
8621 return 0;
8622
8623 err_flowtable_del_hook:
8624 list_splice(&flowtable_del_list, &flowtable->hook_list);
8625 nft_flowtable_hook_release(&flowtable_hook);
8626
8627 return err;
8628 }
8629
nf_tables_delflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8630 static int nf_tables_delflowtable(struct sk_buff *skb,
8631 const struct nfnl_info *info,
8632 const struct nlattr * const nla[])
8633 {
8634 struct netlink_ext_ack *extack = info->extack;
8635 u8 genmask = nft_genmask_next(info->net);
8636 u8 family = info->nfmsg->nfgen_family;
8637 struct nft_flowtable *flowtable;
8638 struct net *net = info->net;
8639 const struct nlattr *attr;
8640 struct nft_table *table;
8641 struct nft_ctx ctx;
8642
8643 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8644 (!nla[NFTA_FLOWTABLE_NAME] &&
8645 !nla[NFTA_FLOWTABLE_HANDLE]))
8646 return -EINVAL;
8647
8648 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8649 genmask, NETLINK_CB(skb).portid);
8650 if (IS_ERR(table)) {
8651 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8652 return PTR_ERR(table);
8653 }
8654
8655 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8656 attr = nla[NFTA_FLOWTABLE_HANDLE];
8657 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8658 } else {
8659 attr = nla[NFTA_FLOWTABLE_NAME];
8660 flowtable = nft_flowtable_lookup(table, attr, genmask);
8661 }
8662
8663 if (IS_ERR(flowtable)) {
8664 if (PTR_ERR(flowtable) == -ENOENT &&
8665 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8666 return 0;
8667
8668 NL_SET_BAD_ATTR(extack, attr);
8669 return PTR_ERR(flowtable);
8670 }
8671
8672 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8673
8674 if (nla[NFTA_FLOWTABLE_HOOK])
8675 return nft_delflowtable_hook(&ctx, flowtable, extack);
8676
8677 if (flowtable->use > 0) {
8678 NL_SET_BAD_ATTR(extack, attr);
8679 return -EBUSY;
8680 }
8681
8682 return nft_delflowtable(&ctx, flowtable);
8683 }
8684
nf_tables_fill_flowtable_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq,int event,u32 flags,int family,struct nft_flowtable * flowtable,struct list_head * hook_list)8685 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8686 u32 portid, u32 seq, int event,
8687 u32 flags, int family,
8688 struct nft_flowtable *flowtable,
8689 struct list_head *hook_list)
8690 {
8691 struct nlattr *nest, *nest_devs;
8692 struct nft_hook *hook;
8693 struct nlmsghdr *nlh;
8694
8695 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8696 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8697 NFNETLINK_V0, nft_base_seq(net));
8698 if (!nlh)
8699 goto nla_put_failure;
8700
8701 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8702 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8703 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8704 NFTA_FLOWTABLE_PAD))
8705 goto nla_put_failure;
8706
8707 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8708 nlmsg_end(skb, nlh);
8709 return 0;
8710 }
8711
8712 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8713 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8714 goto nla_put_failure;
8715
8716 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8717 if (!nest)
8718 goto nla_put_failure;
8719 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8720 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8721 goto nla_put_failure;
8722
8723 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8724 if (!nest_devs)
8725 goto nla_put_failure;
8726
8727 if (!hook_list)
8728 hook_list = &flowtable->hook_list;
8729
8730 list_for_each_entry_rcu(hook, hook_list, list) {
8731 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8732 goto nla_put_failure;
8733 }
8734 nla_nest_end(skb, nest_devs);
8735 nla_nest_end(skb, nest);
8736
8737 nlmsg_end(skb, nlh);
8738 return 0;
8739
8740 nla_put_failure:
8741 nlmsg_trim(skb, nlh);
8742 return -1;
8743 }
8744
8745 struct nft_flowtable_filter {
8746 char *table;
8747 };
8748
nf_tables_dump_flowtable(struct sk_buff * skb,struct netlink_callback * cb)8749 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8750 struct netlink_callback *cb)
8751 {
8752 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8753 struct nft_flowtable_filter *filter = cb->data;
8754 unsigned int idx = 0, s_idx = cb->args[0];
8755 struct net *net = sock_net(skb->sk);
8756 int family = nfmsg->nfgen_family;
8757 struct nft_flowtable *flowtable;
8758 struct nftables_pernet *nft_net;
8759 const struct nft_table *table;
8760
8761 rcu_read_lock();
8762 nft_net = nft_pernet(net);
8763 cb->seq = READ_ONCE(nft_net->base_seq);
8764
8765 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8766 if (family != NFPROTO_UNSPEC && family != table->family)
8767 continue;
8768
8769 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8770 if (!nft_is_active(net, flowtable))
8771 goto cont;
8772 if (idx < s_idx)
8773 goto cont;
8774 if (idx > s_idx)
8775 memset(&cb->args[1], 0,
8776 sizeof(cb->args) - sizeof(cb->args[0]));
8777 if (filter && filter->table &&
8778 strcmp(filter->table, table->name))
8779 goto cont;
8780
8781 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8782 cb->nlh->nlmsg_seq,
8783 NFT_MSG_NEWFLOWTABLE,
8784 NLM_F_MULTI | NLM_F_APPEND,
8785 table->family,
8786 flowtable, NULL) < 0)
8787 goto done;
8788
8789 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8790 cont:
8791 idx++;
8792 }
8793 }
8794 done:
8795 rcu_read_unlock();
8796
8797 cb->args[0] = idx;
8798 return skb->len;
8799 }
8800
nf_tables_dump_flowtable_start(struct netlink_callback * cb)8801 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8802 {
8803 const struct nlattr * const *nla = cb->data;
8804 struct nft_flowtable_filter *filter = NULL;
8805
8806 if (nla[NFTA_FLOWTABLE_TABLE]) {
8807 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8808 if (!filter)
8809 return -ENOMEM;
8810
8811 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8812 GFP_ATOMIC);
8813 if (!filter->table) {
8814 kfree(filter);
8815 return -ENOMEM;
8816 }
8817 }
8818
8819 cb->data = filter;
8820 return 0;
8821 }
8822
nf_tables_dump_flowtable_done(struct netlink_callback * cb)8823 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8824 {
8825 struct nft_flowtable_filter *filter = cb->data;
8826
8827 if (!filter)
8828 return 0;
8829
8830 kfree(filter->table);
8831 kfree(filter);
8832
8833 return 0;
8834 }
8835
8836 /* called with rcu_read_lock held */
nf_tables_getflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8837 static int nf_tables_getflowtable(struct sk_buff *skb,
8838 const struct nfnl_info *info,
8839 const struct nlattr * const nla[])
8840 {
8841 u8 genmask = nft_genmask_cur(info->net);
8842 u8 family = info->nfmsg->nfgen_family;
8843 struct nft_flowtable *flowtable;
8844 const struct nft_table *table;
8845 struct net *net = info->net;
8846 struct sk_buff *skb2;
8847 int err;
8848
8849 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8850 struct netlink_dump_control c = {
8851 .start = nf_tables_dump_flowtable_start,
8852 .dump = nf_tables_dump_flowtable,
8853 .done = nf_tables_dump_flowtable_done,
8854 .module = THIS_MODULE,
8855 .data = (void *)nla,
8856 };
8857
8858 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8859 }
8860
8861 if (!nla[NFTA_FLOWTABLE_NAME])
8862 return -EINVAL;
8863
8864 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8865 genmask, 0);
8866 if (IS_ERR(table))
8867 return PTR_ERR(table);
8868
8869 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8870 genmask);
8871 if (IS_ERR(flowtable))
8872 return PTR_ERR(flowtable);
8873
8874 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8875 if (!skb2)
8876 return -ENOMEM;
8877
8878 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8879 info->nlh->nlmsg_seq,
8880 NFT_MSG_NEWFLOWTABLE, 0, family,
8881 flowtable, NULL);
8882 if (err < 0)
8883 goto err_fill_flowtable_info;
8884
8885 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8886
8887 err_fill_flowtable_info:
8888 kfree_skb(skb2);
8889 return err;
8890 }
8891
nf_tables_flowtable_notify(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct list_head * hook_list,int event)8892 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8893 struct nft_flowtable *flowtable,
8894 struct list_head *hook_list, int event)
8895 {
8896 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8897 struct sk_buff *skb;
8898 u16 flags = 0;
8899 int err;
8900
8901 if (!ctx->report &&
8902 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8903 return;
8904
8905 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8906 if (skb == NULL)
8907 goto err;
8908
8909 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8910 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8911
8912 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8913 ctx->seq, event, flags,
8914 ctx->family, flowtable, hook_list);
8915 if (err < 0) {
8916 kfree_skb(skb);
8917 goto err;
8918 }
8919
8920 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8921 return;
8922 err:
8923 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8924 }
8925
nf_tables_flowtable_destroy(struct nft_flowtable * flowtable)8926 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8927 {
8928 struct nft_hook *hook, *next;
8929
8930 flowtable->data.type->free(&flowtable->data);
8931 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8932 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8933 FLOW_BLOCK_UNBIND);
8934 list_del_rcu(&hook->list);
8935 kfree(hook);
8936 }
8937 kfree(flowtable->name);
8938 module_put(flowtable->data.type->owner);
8939 kfree(flowtable);
8940 }
8941
nf_tables_fill_gen_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq)8942 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8943 u32 portid, u32 seq)
8944 {
8945 struct nftables_pernet *nft_net = nft_pernet(net);
8946 struct nlmsghdr *nlh;
8947 char buf[TASK_COMM_LEN];
8948 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8949
8950 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8951 NFNETLINK_V0, nft_base_seq(net));
8952 if (!nlh)
8953 goto nla_put_failure;
8954
8955 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8956 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8957 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8958 goto nla_put_failure;
8959
8960 nlmsg_end(skb, nlh);
8961 return 0;
8962
8963 nla_put_failure:
8964 nlmsg_trim(skb, nlh);
8965 return -EMSGSIZE;
8966 }
8967
nft_flowtable_event(unsigned long event,struct net_device * dev,struct nft_flowtable * flowtable)8968 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8969 struct nft_flowtable *flowtable)
8970 {
8971 struct nft_hook *hook;
8972
8973 list_for_each_entry(hook, &flowtable->hook_list, list) {
8974 if (hook->ops.dev != dev)
8975 continue;
8976
8977 /* flow_offload_netdev_event() cleans up entries for us. */
8978 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8979 list_del_rcu(&hook->list);
8980 kfree_rcu(hook, rcu);
8981 break;
8982 }
8983 }
8984
nf_tables_flowtable_event(struct notifier_block * this,unsigned long event,void * ptr)8985 static int nf_tables_flowtable_event(struct notifier_block *this,
8986 unsigned long event, void *ptr)
8987 {
8988 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8989 struct nft_flowtable *flowtable;
8990 struct nftables_pernet *nft_net;
8991 struct nft_table *table;
8992 struct net *net;
8993
8994 if (event != NETDEV_UNREGISTER)
8995 return 0;
8996
8997 net = dev_net(dev);
8998 nft_net = nft_pernet(net);
8999 mutex_lock(&nft_net->commit_mutex);
9000 list_for_each_entry(table, &nft_net->tables, list) {
9001 list_for_each_entry(flowtable, &table->flowtables, list) {
9002 nft_flowtable_event(event, dev, flowtable);
9003 }
9004 }
9005 mutex_unlock(&nft_net->commit_mutex);
9006
9007 return NOTIFY_DONE;
9008 }
9009
9010 static struct notifier_block nf_tables_flowtable_notifier = {
9011 .notifier_call = nf_tables_flowtable_event,
9012 };
9013
nf_tables_gen_notify(struct net * net,struct sk_buff * skb,int event)9014 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9015 int event)
9016 {
9017 struct nlmsghdr *nlh = nlmsg_hdr(skb);
9018 struct sk_buff *skb2;
9019 int err;
9020
9021 if (!nlmsg_report(nlh) &&
9022 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9023 return;
9024
9025 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9026 if (skb2 == NULL)
9027 goto err;
9028
9029 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9030 nlh->nlmsg_seq);
9031 if (err < 0) {
9032 kfree_skb(skb2);
9033 goto err;
9034 }
9035
9036 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9037 nlmsg_report(nlh), GFP_KERNEL);
9038 return;
9039 err:
9040 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9041 -ENOBUFS);
9042 }
9043
nf_tables_getgen(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])9044 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9045 const struct nlattr * const nla[])
9046 {
9047 struct sk_buff *skb2;
9048 int err;
9049
9050 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9051 if (skb2 == NULL)
9052 return -ENOMEM;
9053
9054 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9055 info->nlh->nlmsg_seq);
9056 if (err < 0)
9057 goto err_fill_gen_info;
9058
9059 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9060
9061 err_fill_gen_info:
9062 kfree_skb(skb2);
9063 return err;
9064 }
9065
9066 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9067 [NFT_MSG_NEWTABLE] = {
9068 .call = nf_tables_newtable,
9069 .type = NFNL_CB_BATCH,
9070 .attr_count = NFTA_TABLE_MAX,
9071 .policy = nft_table_policy,
9072 },
9073 [NFT_MSG_GETTABLE] = {
9074 .call = nf_tables_gettable,
9075 .type = NFNL_CB_RCU,
9076 .attr_count = NFTA_TABLE_MAX,
9077 .policy = nft_table_policy,
9078 },
9079 [NFT_MSG_DELTABLE] = {
9080 .call = nf_tables_deltable,
9081 .type = NFNL_CB_BATCH,
9082 .attr_count = NFTA_TABLE_MAX,
9083 .policy = nft_table_policy,
9084 },
9085 [NFT_MSG_DESTROYTABLE] = {
9086 .call = nf_tables_deltable,
9087 .type = NFNL_CB_BATCH,
9088 .attr_count = NFTA_TABLE_MAX,
9089 .policy = nft_table_policy,
9090 },
9091 [NFT_MSG_NEWCHAIN] = {
9092 .call = nf_tables_newchain,
9093 .type = NFNL_CB_BATCH,
9094 .attr_count = NFTA_CHAIN_MAX,
9095 .policy = nft_chain_policy,
9096 },
9097 [NFT_MSG_GETCHAIN] = {
9098 .call = nf_tables_getchain,
9099 .type = NFNL_CB_RCU,
9100 .attr_count = NFTA_CHAIN_MAX,
9101 .policy = nft_chain_policy,
9102 },
9103 [NFT_MSG_DELCHAIN] = {
9104 .call = nf_tables_delchain,
9105 .type = NFNL_CB_BATCH,
9106 .attr_count = NFTA_CHAIN_MAX,
9107 .policy = nft_chain_policy,
9108 },
9109 [NFT_MSG_DESTROYCHAIN] = {
9110 .call = nf_tables_delchain,
9111 .type = NFNL_CB_BATCH,
9112 .attr_count = NFTA_CHAIN_MAX,
9113 .policy = nft_chain_policy,
9114 },
9115 [NFT_MSG_NEWRULE] = {
9116 .call = nf_tables_newrule,
9117 .type = NFNL_CB_BATCH,
9118 .attr_count = NFTA_RULE_MAX,
9119 .policy = nft_rule_policy,
9120 },
9121 [NFT_MSG_GETRULE] = {
9122 .call = nf_tables_getrule,
9123 .type = NFNL_CB_RCU,
9124 .attr_count = NFTA_RULE_MAX,
9125 .policy = nft_rule_policy,
9126 },
9127 [NFT_MSG_GETRULE_RESET] = {
9128 .call = nf_tables_getrule,
9129 .type = NFNL_CB_RCU,
9130 .attr_count = NFTA_RULE_MAX,
9131 .policy = nft_rule_policy,
9132 },
9133 [NFT_MSG_DELRULE] = {
9134 .call = nf_tables_delrule,
9135 .type = NFNL_CB_BATCH,
9136 .attr_count = NFTA_RULE_MAX,
9137 .policy = nft_rule_policy,
9138 },
9139 [NFT_MSG_DESTROYRULE] = {
9140 .call = nf_tables_delrule,
9141 .type = NFNL_CB_BATCH,
9142 .attr_count = NFTA_RULE_MAX,
9143 .policy = nft_rule_policy,
9144 },
9145 [NFT_MSG_NEWSET] = {
9146 .call = nf_tables_newset,
9147 .type = NFNL_CB_BATCH,
9148 .attr_count = NFTA_SET_MAX,
9149 .policy = nft_set_policy,
9150 },
9151 [NFT_MSG_GETSET] = {
9152 .call = nf_tables_getset,
9153 .type = NFNL_CB_RCU,
9154 .attr_count = NFTA_SET_MAX,
9155 .policy = nft_set_policy,
9156 },
9157 [NFT_MSG_DELSET] = {
9158 .call = nf_tables_delset,
9159 .type = NFNL_CB_BATCH,
9160 .attr_count = NFTA_SET_MAX,
9161 .policy = nft_set_policy,
9162 },
9163 [NFT_MSG_DESTROYSET] = {
9164 .call = nf_tables_delset,
9165 .type = NFNL_CB_BATCH,
9166 .attr_count = NFTA_SET_MAX,
9167 .policy = nft_set_policy,
9168 },
9169 [NFT_MSG_NEWSETELEM] = {
9170 .call = nf_tables_newsetelem,
9171 .type = NFNL_CB_BATCH,
9172 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9173 .policy = nft_set_elem_list_policy,
9174 },
9175 [NFT_MSG_GETSETELEM] = {
9176 .call = nf_tables_getsetelem,
9177 .type = NFNL_CB_RCU,
9178 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9179 .policy = nft_set_elem_list_policy,
9180 },
9181 [NFT_MSG_GETSETELEM_RESET] = {
9182 .call = nf_tables_getsetelem,
9183 .type = NFNL_CB_RCU,
9184 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9185 .policy = nft_set_elem_list_policy,
9186 },
9187 [NFT_MSG_DELSETELEM] = {
9188 .call = nf_tables_delsetelem,
9189 .type = NFNL_CB_BATCH,
9190 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9191 .policy = nft_set_elem_list_policy,
9192 },
9193 [NFT_MSG_DESTROYSETELEM] = {
9194 .call = nf_tables_delsetelem,
9195 .type = NFNL_CB_BATCH,
9196 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9197 .policy = nft_set_elem_list_policy,
9198 },
9199 [NFT_MSG_GETGEN] = {
9200 .call = nf_tables_getgen,
9201 .type = NFNL_CB_RCU,
9202 },
9203 [NFT_MSG_NEWOBJ] = {
9204 .call = nf_tables_newobj,
9205 .type = NFNL_CB_BATCH,
9206 .attr_count = NFTA_OBJ_MAX,
9207 .policy = nft_obj_policy,
9208 },
9209 [NFT_MSG_GETOBJ] = {
9210 .call = nf_tables_getobj,
9211 .type = NFNL_CB_RCU,
9212 .attr_count = NFTA_OBJ_MAX,
9213 .policy = nft_obj_policy,
9214 },
9215 [NFT_MSG_DELOBJ] = {
9216 .call = nf_tables_delobj,
9217 .type = NFNL_CB_BATCH,
9218 .attr_count = NFTA_OBJ_MAX,
9219 .policy = nft_obj_policy,
9220 },
9221 [NFT_MSG_DESTROYOBJ] = {
9222 .call = nf_tables_delobj,
9223 .type = NFNL_CB_BATCH,
9224 .attr_count = NFTA_OBJ_MAX,
9225 .policy = nft_obj_policy,
9226 },
9227 [NFT_MSG_GETOBJ_RESET] = {
9228 .call = nf_tables_getobj_reset,
9229 .type = NFNL_CB_RCU,
9230 .attr_count = NFTA_OBJ_MAX,
9231 .policy = nft_obj_policy,
9232 },
9233 [NFT_MSG_NEWFLOWTABLE] = {
9234 .call = nf_tables_newflowtable,
9235 .type = NFNL_CB_BATCH,
9236 .attr_count = NFTA_FLOWTABLE_MAX,
9237 .policy = nft_flowtable_policy,
9238 },
9239 [NFT_MSG_GETFLOWTABLE] = {
9240 .call = nf_tables_getflowtable,
9241 .type = NFNL_CB_RCU,
9242 .attr_count = NFTA_FLOWTABLE_MAX,
9243 .policy = nft_flowtable_policy,
9244 },
9245 [NFT_MSG_DELFLOWTABLE] = {
9246 .call = nf_tables_delflowtable,
9247 .type = NFNL_CB_BATCH,
9248 .attr_count = NFTA_FLOWTABLE_MAX,
9249 .policy = nft_flowtable_policy,
9250 },
9251 [NFT_MSG_DESTROYFLOWTABLE] = {
9252 .call = nf_tables_delflowtable,
9253 .type = NFNL_CB_BATCH,
9254 .attr_count = NFTA_FLOWTABLE_MAX,
9255 .policy = nft_flowtable_policy,
9256 },
9257 };
9258
nf_tables_validate(struct net * net)9259 static int nf_tables_validate(struct net *net)
9260 {
9261 struct nftables_pernet *nft_net = nft_pernet(net);
9262 struct nft_table *table;
9263
9264 list_for_each_entry(table, &nft_net->tables, list) {
9265 switch (table->validate_state) {
9266 case NFT_VALIDATE_SKIP:
9267 continue;
9268 case NFT_VALIDATE_NEED:
9269 nft_validate_state_update(table, NFT_VALIDATE_DO);
9270 fallthrough;
9271 case NFT_VALIDATE_DO:
9272 if (nft_table_validate(net, table) < 0)
9273 return -EAGAIN;
9274
9275 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9276 break;
9277 }
9278 }
9279
9280 return 0;
9281 }
9282
9283 /* a drop policy has to be deferred until all rules have been activated,
9284 * otherwise a large ruleset that contains a drop-policy base chain will
9285 * cause all packets to get dropped until the full transaction has been
9286 * processed.
9287 *
9288 * We defer the drop policy until the transaction has been finalized.
9289 */
nft_chain_commit_drop_policy(struct nft_trans * trans)9290 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9291 {
9292 struct nft_base_chain *basechain;
9293
9294 if (nft_trans_chain_policy(trans) != NF_DROP)
9295 return;
9296
9297 if (!nft_is_base_chain(trans->ctx.chain))
9298 return;
9299
9300 basechain = nft_base_chain(trans->ctx.chain);
9301 basechain->policy = NF_DROP;
9302 }
9303
nft_chain_commit_update(struct nft_trans * trans)9304 static void nft_chain_commit_update(struct nft_trans *trans)
9305 {
9306 struct nft_base_chain *basechain;
9307
9308 if (nft_trans_chain_name(trans)) {
9309 rhltable_remove(&trans->ctx.table->chains_ht,
9310 &trans->ctx.chain->rhlhead,
9311 nft_chain_ht_params);
9312 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9313 rhltable_insert_key(&trans->ctx.table->chains_ht,
9314 trans->ctx.chain->name,
9315 &trans->ctx.chain->rhlhead,
9316 nft_chain_ht_params);
9317 }
9318
9319 if (!nft_is_base_chain(trans->ctx.chain))
9320 return;
9321
9322 nft_chain_stats_replace(trans);
9323
9324 basechain = nft_base_chain(trans->ctx.chain);
9325
9326 switch (nft_trans_chain_policy(trans)) {
9327 case NF_DROP:
9328 case NF_ACCEPT:
9329 basechain->policy = nft_trans_chain_policy(trans);
9330 break;
9331 }
9332 }
9333
nft_obj_commit_update(struct nft_trans * trans)9334 static void nft_obj_commit_update(struct nft_trans *trans)
9335 {
9336 struct nft_object *newobj;
9337 struct nft_object *obj;
9338
9339 obj = nft_trans_obj(trans);
9340 newobj = nft_trans_obj_newobj(trans);
9341
9342 if (obj->ops->update)
9343 obj->ops->update(obj, newobj);
9344
9345 nft_obj_destroy(&trans->ctx, newobj);
9346 }
9347
nft_commit_release(struct nft_trans * trans)9348 static void nft_commit_release(struct nft_trans *trans)
9349 {
9350 switch (trans->msg_type) {
9351 case NFT_MSG_DELTABLE:
9352 case NFT_MSG_DESTROYTABLE:
9353 nf_tables_table_destroy(&trans->ctx);
9354 break;
9355 case NFT_MSG_NEWCHAIN:
9356 free_percpu(nft_trans_chain_stats(trans));
9357 kfree(nft_trans_chain_name(trans));
9358 break;
9359 case NFT_MSG_DELCHAIN:
9360 case NFT_MSG_DESTROYCHAIN:
9361 if (nft_trans_chain_update(trans))
9362 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9363 else
9364 nf_tables_chain_destroy(&trans->ctx);
9365 break;
9366 case NFT_MSG_DELRULE:
9367 case NFT_MSG_DESTROYRULE:
9368 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9369 break;
9370 case NFT_MSG_DELSET:
9371 case NFT_MSG_DESTROYSET:
9372 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9373 break;
9374 case NFT_MSG_DELSETELEM:
9375 case NFT_MSG_DESTROYSETELEM:
9376 nf_tables_set_elem_destroy(&trans->ctx,
9377 nft_trans_elem_set(trans),
9378 nft_trans_elem(trans).priv);
9379 break;
9380 case NFT_MSG_DELOBJ:
9381 case NFT_MSG_DESTROYOBJ:
9382 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9383 break;
9384 case NFT_MSG_DELFLOWTABLE:
9385 case NFT_MSG_DESTROYFLOWTABLE:
9386 if (nft_trans_flowtable_update(trans))
9387 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9388 else
9389 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9390 break;
9391 }
9392
9393 if (trans->put_net)
9394 put_net(trans->ctx.net);
9395
9396 kfree(trans);
9397 }
9398
nf_tables_trans_destroy_work(struct work_struct * w)9399 static void nf_tables_trans_destroy_work(struct work_struct *w)
9400 {
9401 struct nft_trans *trans, *next;
9402 LIST_HEAD(head);
9403
9404 spin_lock(&nf_tables_destroy_list_lock);
9405 list_splice_init(&nf_tables_destroy_list, &head);
9406 spin_unlock(&nf_tables_destroy_list_lock);
9407
9408 if (list_empty(&head))
9409 return;
9410
9411 synchronize_rcu();
9412
9413 list_for_each_entry_safe(trans, next, &head, list) {
9414 nft_trans_list_del(trans);
9415 nft_commit_release(trans);
9416 }
9417 }
9418
nf_tables_trans_destroy_flush_work(void)9419 void nf_tables_trans_destroy_flush_work(void)
9420 {
9421 flush_work(&trans_destroy_work);
9422 }
9423 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9424
nft_expr_reduce(struct nft_regs_track * track,const struct nft_expr * expr)9425 static bool nft_expr_reduce(struct nft_regs_track *track,
9426 const struct nft_expr *expr)
9427 {
9428 return false;
9429 }
9430
nf_tables_commit_chain_prepare(struct net * net,struct nft_chain * chain)9431 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9432 {
9433 const struct nft_expr *expr, *last;
9434 struct nft_regs_track track = {};
9435 unsigned int size, data_size;
9436 void *data, *data_boundary;
9437 struct nft_rule_dp *prule;
9438 struct nft_rule *rule;
9439
9440 /* already handled or inactive chain? */
9441 if (chain->blob_next || !nft_is_active_next(net, chain))
9442 return 0;
9443
9444 data_size = 0;
9445 list_for_each_entry(rule, &chain->rules, list) {
9446 if (nft_is_active_next(net, rule)) {
9447 data_size += sizeof(*prule) + rule->dlen;
9448 if (data_size > INT_MAX)
9449 return -ENOMEM;
9450 }
9451 }
9452
9453 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9454 if (!chain->blob_next)
9455 return -ENOMEM;
9456
9457 data = (void *)chain->blob_next->data;
9458 data_boundary = data + data_size;
9459 size = 0;
9460
9461 list_for_each_entry(rule, &chain->rules, list) {
9462 if (!nft_is_active_next(net, rule))
9463 continue;
9464
9465 prule = (struct nft_rule_dp *)data;
9466 data += offsetof(struct nft_rule_dp, data);
9467 if (WARN_ON_ONCE(data > data_boundary))
9468 return -ENOMEM;
9469
9470 size = 0;
9471 track.last = nft_expr_last(rule);
9472 nft_rule_for_each_expr(expr, last, rule) {
9473 track.cur = expr;
9474
9475 if (nft_expr_reduce(&track, expr)) {
9476 expr = track.cur;
9477 continue;
9478 }
9479
9480 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9481 return -ENOMEM;
9482
9483 memcpy(data + size, expr, expr->ops->size);
9484 size += expr->ops->size;
9485 }
9486 if (WARN_ON_ONCE(size >= 1 << 12))
9487 return -ENOMEM;
9488
9489 prule->handle = rule->handle;
9490 prule->dlen = size;
9491 prule->is_last = 0;
9492
9493 data += size;
9494 size = 0;
9495 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9496 }
9497
9498 if (WARN_ON_ONCE(data > data_boundary))
9499 return -ENOMEM;
9500
9501 prule = (struct nft_rule_dp *)data;
9502 nft_last_rule(chain, prule);
9503
9504 return 0;
9505 }
9506
nf_tables_commit_chain_prepare_cancel(struct net * net)9507 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9508 {
9509 struct nftables_pernet *nft_net = nft_pernet(net);
9510 struct nft_trans *trans, *next;
9511
9512 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9513 struct nft_chain *chain = trans->ctx.chain;
9514
9515 if (trans->msg_type == NFT_MSG_NEWRULE ||
9516 trans->msg_type == NFT_MSG_DELRULE) {
9517 kvfree(chain->blob_next);
9518 chain->blob_next = NULL;
9519 }
9520 }
9521 }
9522
__nf_tables_commit_chain_free_rules(struct rcu_head * h)9523 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9524 {
9525 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9526
9527 kvfree(l->blob);
9528 }
9529
nf_tables_commit_chain_free_rules_old(struct nft_rule_blob * blob)9530 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9531 {
9532 struct nft_rule_dp_last *last;
9533
9534 /* last rule trailer is after end marker */
9535 last = (void *)blob + sizeof(*blob) + blob->size;
9536 last->blob = blob;
9537
9538 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9539 }
9540
nf_tables_commit_chain(struct net * net,struct nft_chain * chain)9541 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9542 {
9543 struct nft_rule_blob *g0, *g1;
9544 bool next_genbit;
9545
9546 next_genbit = nft_gencursor_next(net);
9547
9548 g0 = rcu_dereference_protected(chain->blob_gen_0,
9549 lockdep_commit_lock_is_held(net));
9550 g1 = rcu_dereference_protected(chain->blob_gen_1,
9551 lockdep_commit_lock_is_held(net));
9552
9553 /* No changes to this chain? */
9554 if (chain->blob_next == NULL) {
9555 /* chain had no change in last or next generation */
9556 if (g0 == g1)
9557 return;
9558 /*
9559 * chain had no change in this generation; make sure next
9560 * one uses same rules as current generation.
9561 */
9562 if (next_genbit) {
9563 rcu_assign_pointer(chain->blob_gen_1, g0);
9564 nf_tables_commit_chain_free_rules_old(g1);
9565 } else {
9566 rcu_assign_pointer(chain->blob_gen_0, g1);
9567 nf_tables_commit_chain_free_rules_old(g0);
9568 }
9569
9570 return;
9571 }
9572
9573 if (next_genbit)
9574 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9575 else
9576 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9577
9578 chain->blob_next = NULL;
9579
9580 if (g0 == g1)
9581 return;
9582
9583 if (next_genbit)
9584 nf_tables_commit_chain_free_rules_old(g1);
9585 else
9586 nf_tables_commit_chain_free_rules_old(g0);
9587 }
9588
nft_obj_del(struct nft_object * obj)9589 static void nft_obj_del(struct nft_object *obj)
9590 {
9591 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9592 list_del_rcu(&obj->list);
9593 }
9594
nft_chain_del(struct nft_chain * chain)9595 void nft_chain_del(struct nft_chain *chain)
9596 {
9597 struct nft_table *table = chain->table;
9598
9599 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9600 nft_chain_ht_params));
9601 list_del_rcu(&chain->list);
9602 }
9603
nft_trans_gc_setelem_remove(struct nft_ctx * ctx,struct nft_trans_gc * trans)9604 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9605 struct nft_trans_gc *trans)
9606 {
9607 void **priv = trans->priv;
9608 unsigned int i;
9609
9610 for (i = 0; i < trans->count; i++) {
9611 struct nft_set_elem elem = {
9612 .priv = priv[i],
9613 };
9614
9615 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9616 nft_setelem_remove(ctx->net, trans->set, &elem);
9617 }
9618 }
9619
nft_trans_gc_destroy(struct nft_trans_gc * trans)9620 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9621 {
9622 nft_set_put(trans->set);
9623 put_net(trans->net);
9624 kfree(trans);
9625 }
9626
nft_trans_gc_trans_free(struct rcu_head * rcu)9627 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9628 {
9629 struct nft_set_elem elem = {};
9630 struct nft_trans_gc *trans;
9631 struct nft_ctx ctx = {};
9632 unsigned int i;
9633
9634 trans = container_of(rcu, struct nft_trans_gc, rcu);
9635 ctx.net = read_pnet(&trans->set->net);
9636
9637 for (i = 0; i < trans->count; i++) {
9638 elem.priv = trans->priv[i];
9639 if (!nft_setelem_is_catchall(trans->set, &elem))
9640 atomic_dec(&trans->set->nelems);
9641
9642 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9643 }
9644
9645 nft_trans_gc_destroy(trans);
9646 }
9647
nft_trans_gc_work_done(struct nft_trans_gc * trans)9648 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9649 {
9650 struct nftables_pernet *nft_net;
9651 struct nft_ctx ctx = {};
9652
9653 nft_net = nft_pernet(trans->net);
9654
9655 mutex_lock(&nft_net->commit_mutex);
9656
9657 /* Check for race with transaction, otherwise this batch refers to
9658 * stale objects that might not be there anymore. Skip transaction if
9659 * set has been destroyed from control plane transaction in case gc
9660 * worker loses race.
9661 */
9662 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9663 mutex_unlock(&nft_net->commit_mutex);
9664 return false;
9665 }
9666
9667 ctx.net = trans->net;
9668 ctx.table = trans->set->table;
9669
9670 nft_trans_gc_setelem_remove(&ctx, trans);
9671 mutex_unlock(&nft_net->commit_mutex);
9672
9673 return true;
9674 }
9675
nft_trans_gc_work(struct work_struct * work)9676 static void nft_trans_gc_work(struct work_struct *work)
9677 {
9678 struct nft_trans_gc *trans, *next;
9679 LIST_HEAD(trans_gc_list);
9680
9681 spin_lock(&nf_tables_gc_list_lock);
9682 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9683 spin_unlock(&nf_tables_gc_list_lock);
9684
9685 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9686 list_del(&trans->list);
9687 if (!nft_trans_gc_work_done(trans)) {
9688 nft_trans_gc_destroy(trans);
9689 continue;
9690 }
9691 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9692 }
9693 }
9694
nft_trans_gc_alloc(struct nft_set * set,unsigned int gc_seq,gfp_t gfp)9695 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9696 unsigned int gc_seq, gfp_t gfp)
9697 {
9698 struct net *net = read_pnet(&set->net);
9699 struct nft_trans_gc *trans;
9700
9701 trans = kzalloc(sizeof(*trans), gfp);
9702 if (!trans)
9703 return NULL;
9704
9705 trans->net = maybe_get_net(net);
9706 if (!trans->net) {
9707 kfree(trans);
9708 return NULL;
9709 }
9710
9711 refcount_inc(&set->refs);
9712 trans->set = set;
9713 trans->seq = gc_seq;
9714
9715 return trans;
9716 }
9717
nft_trans_gc_elem_add(struct nft_trans_gc * trans,void * priv)9718 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9719 {
9720 trans->priv[trans->count++] = priv;
9721 }
9722
nft_trans_gc_queue_work(struct nft_trans_gc * trans)9723 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9724 {
9725 spin_lock(&nf_tables_gc_list_lock);
9726 list_add_tail(&trans->list, &nf_tables_gc_list);
9727 spin_unlock(&nf_tables_gc_list_lock);
9728
9729 schedule_work(&trans_gc_work);
9730 }
9731
nft_trans_gc_space(struct nft_trans_gc * trans)9732 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9733 {
9734 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9735 }
9736
nft_trans_gc_queue_async(struct nft_trans_gc * gc,unsigned int gc_seq,gfp_t gfp)9737 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9738 unsigned int gc_seq, gfp_t gfp)
9739 {
9740 struct nft_set *set;
9741
9742 if (nft_trans_gc_space(gc))
9743 return gc;
9744
9745 set = gc->set;
9746 nft_trans_gc_queue_work(gc);
9747
9748 return nft_trans_gc_alloc(set, gc_seq, gfp);
9749 }
9750
nft_trans_gc_queue_async_done(struct nft_trans_gc * trans)9751 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9752 {
9753 if (trans->count == 0) {
9754 nft_trans_gc_destroy(trans);
9755 return;
9756 }
9757
9758 nft_trans_gc_queue_work(trans);
9759 }
9760
nft_trans_gc_queue_sync(struct nft_trans_gc * gc,gfp_t gfp)9761 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9762 {
9763 struct nft_set *set;
9764
9765 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9766 return NULL;
9767
9768 if (nft_trans_gc_space(gc))
9769 return gc;
9770
9771 set = gc->set;
9772 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9773
9774 return nft_trans_gc_alloc(set, 0, gfp);
9775 }
9776
nft_trans_gc_queue_sync_done(struct nft_trans_gc * trans)9777 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9778 {
9779 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9780
9781 if (trans->count == 0) {
9782 nft_trans_gc_destroy(trans);
9783 return;
9784 }
9785
9786 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9787 }
9788
nft_trans_gc_catchall_async(struct nft_trans_gc * gc,unsigned int gc_seq)9789 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9790 unsigned int gc_seq)
9791 {
9792 struct nft_set_elem_catchall *catchall;
9793 const struct nft_set *set = gc->set;
9794 struct nft_set_ext *ext;
9795
9796 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9797 ext = nft_set_elem_ext(set, catchall->elem);
9798
9799 if (!nft_set_elem_expired(ext))
9800 continue;
9801 if (nft_set_elem_is_dead(ext))
9802 goto dead_elem;
9803
9804 nft_set_elem_dead(ext);
9805 dead_elem:
9806 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9807 if (!gc)
9808 return NULL;
9809
9810 nft_trans_gc_elem_add(gc, catchall->elem);
9811 }
9812
9813 return gc;
9814 }
9815
nft_trans_gc_catchall_sync(struct nft_trans_gc * gc)9816 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9817 {
9818 struct nft_set_elem_catchall *catchall, *next;
9819 const struct nft_set *set = gc->set;
9820 struct nft_set_elem elem;
9821 struct nft_set_ext *ext;
9822
9823 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9824
9825 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9826 ext = nft_set_elem_ext(set, catchall->elem);
9827
9828 if (!nft_set_elem_expired(ext))
9829 continue;
9830
9831 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9832 if (!gc)
9833 return NULL;
9834
9835 memset(&elem, 0, sizeof(elem));
9836 elem.priv = catchall->elem;
9837
9838 nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9839 nft_setelem_catchall_destroy(catchall);
9840 nft_trans_gc_elem_add(gc, elem.priv);
9841 }
9842
9843 return gc;
9844 }
9845
nf_tables_module_autoload_cleanup(struct net * net)9846 static void nf_tables_module_autoload_cleanup(struct net *net)
9847 {
9848 struct nftables_pernet *nft_net = nft_pernet(net);
9849 struct nft_module_request *req, *next;
9850
9851 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9852 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9853 WARN_ON_ONCE(!req->done);
9854 list_del(&req->list);
9855 kfree(req);
9856 }
9857 }
9858
nf_tables_commit_release(struct net * net)9859 static void nf_tables_commit_release(struct net *net)
9860 {
9861 struct nftables_pernet *nft_net = nft_pernet(net);
9862 struct nft_trans *trans;
9863
9864 /* all side effects have to be made visible.
9865 * For example, if a chain named 'foo' has been deleted, a
9866 * new transaction must not find it anymore.
9867 *
9868 * Memory reclaim happens asynchronously from work queue
9869 * to prevent expensive synchronize_rcu() in commit phase.
9870 */
9871 if (list_empty(&nft_net->commit_list)) {
9872 nf_tables_module_autoload_cleanup(net);
9873 mutex_unlock(&nft_net->commit_mutex);
9874 return;
9875 }
9876
9877 trans = list_last_entry(&nft_net->commit_list,
9878 struct nft_trans, list);
9879 get_net(trans->ctx.net);
9880 WARN_ON_ONCE(trans->put_net);
9881
9882 trans->put_net = true;
9883 spin_lock(&nf_tables_destroy_list_lock);
9884 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9885 spin_unlock(&nf_tables_destroy_list_lock);
9886
9887 nf_tables_module_autoload_cleanup(net);
9888 schedule_work(&trans_destroy_work);
9889
9890 mutex_unlock(&nft_net->commit_mutex);
9891 }
9892
nft_commit_notify(struct net * net,u32 portid)9893 static void nft_commit_notify(struct net *net, u32 portid)
9894 {
9895 struct nftables_pernet *nft_net = nft_pernet(net);
9896 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9897 unsigned char *data;
9898 int len;
9899
9900 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9901 if (!batch_skb) {
9902 new_batch:
9903 batch_skb = skb;
9904 len = NLMSG_GOODSIZE - skb->len;
9905 list_del(&skb->list);
9906 continue;
9907 }
9908 len -= skb->len;
9909 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9910 data = skb_put(batch_skb, skb->len);
9911 memcpy(data, skb->data, skb->len);
9912 list_del(&skb->list);
9913 kfree_skb(skb);
9914 continue;
9915 }
9916 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9917 NFT_CB(batch_skb).report, GFP_KERNEL);
9918 goto new_batch;
9919 }
9920
9921 if (batch_skb) {
9922 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9923 NFT_CB(batch_skb).report, GFP_KERNEL);
9924 }
9925
9926 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9927 }
9928
nf_tables_commit_audit_alloc(struct list_head * adl,struct nft_table * table)9929 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9930 struct nft_table *table)
9931 {
9932 struct nft_audit_data *adp;
9933
9934 list_for_each_entry(adp, adl, list) {
9935 if (adp->table == table)
9936 return 0;
9937 }
9938 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9939 if (!adp)
9940 return -ENOMEM;
9941 adp->table = table;
9942 list_add(&adp->list, adl);
9943 return 0;
9944 }
9945
nf_tables_commit_audit_free(struct list_head * adl)9946 static void nf_tables_commit_audit_free(struct list_head *adl)
9947 {
9948 struct nft_audit_data *adp, *adn;
9949
9950 list_for_each_entry_safe(adp, adn, adl, list) {
9951 list_del(&adp->list);
9952 kfree(adp);
9953 }
9954 }
9955
nf_tables_commit_audit_collect(struct list_head * adl,struct nft_table * table,u32 op)9956 static void nf_tables_commit_audit_collect(struct list_head *adl,
9957 struct nft_table *table, u32 op)
9958 {
9959 struct nft_audit_data *adp;
9960
9961 list_for_each_entry(adp, adl, list) {
9962 if (adp->table == table)
9963 goto found;
9964 }
9965 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9966 return;
9967 found:
9968 adp->entries++;
9969 if (!adp->op || adp->op > op)
9970 adp->op = op;
9971 }
9972
9973 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9974
nf_tables_commit_audit_log(struct list_head * adl,u32 generation)9975 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9976 {
9977 struct nft_audit_data *adp, *adn;
9978 char aubuf[AUNFTABLENAMELEN];
9979
9980 list_for_each_entry_safe(adp, adn, adl, list) {
9981 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9982 generation);
9983 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9984 nft2audit_op[adp->op], GFP_KERNEL);
9985 list_del(&adp->list);
9986 kfree(adp);
9987 }
9988 }
9989
nft_set_commit_update(struct list_head * set_update_list)9990 static void nft_set_commit_update(struct list_head *set_update_list)
9991 {
9992 struct nft_set *set, *next;
9993
9994 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9995 list_del_init(&set->pending_update);
9996
9997 if (!set->ops->commit || set->dead)
9998 continue;
9999
10000 set->ops->commit(set);
10001 }
10002 }
10003
nft_gc_seq_begin(struct nftables_pernet * nft_net)10004 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10005 {
10006 unsigned int gc_seq;
10007
10008 /* Bump gc counter, it becomes odd, this is the busy mark. */
10009 gc_seq = READ_ONCE(nft_net->gc_seq);
10010 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10011
10012 return gc_seq;
10013 }
10014
nft_gc_seq_end(struct nftables_pernet * nft_net,unsigned int gc_seq)10015 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10016 {
10017 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10018 }
10019
nf_tables_commit(struct net * net,struct sk_buff * skb)10020 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10021 {
10022 struct nftables_pernet *nft_net = nft_pernet(net);
10023 struct nft_trans *trans, *next;
10024 unsigned int base_seq, gc_seq;
10025 LIST_HEAD(set_update_list);
10026 struct nft_trans_elem *te;
10027 struct nft_chain *chain;
10028 struct nft_table *table;
10029 LIST_HEAD(adl);
10030 int err;
10031
10032 if (list_empty(&nft_net->commit_list)) {
10033 mutex_unlock(&nft_net->commit_mutex);
10034 return 0;
10035 }
10036
10037 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10038 switch (trans->msg_type) {
10039 case NFT_MSG_NEWSET:
10040 if (!nft_trans_set_update(trans) &&
10041 nft_set_is_anonymous(nft_trans_set(trans)) &&
10042 !nft_trans_set_bound(trans)) {
10043 pr_warn_once("nftables ruleset with unbound set\n");
10044 return -EINVAL;
10045 }
10046 break;
10047 case NFT_MSG_NEWCHAIN:
10048 if (!nft_trans_chain_update(trans) &&
10049 nft_chain_binding(nft_trans_chain(trans)) &&
10050 !nft_trans_chain_bound(trans)) {
10051 pr_warn_once("nftables ruleset with unbound chain\n");
10052 return -EINVAL;
10053 }
10054 break;
10055 }
10056 }
10057
10058 /* 0. Validate ruleset, otherwise roll back for error reporting. */
10059 if (nf_tables_validate(net) < 0) {
10060 nft_net->validate_state = NFT_VALIDATE_DO;
10061 return -EAGAIN;
10062 }
10063
10064 err = nft_flow_rule_offload_commit(net);
10065 if (err < 0)
10066 return err;
10067
10068 /* 1. Allocate space for next generation rules_gen_X[] */
10069 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10070 int ret;
10071
10072 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10073 if (ret) {
10074 nf_tables_commit_chain_prepare_cancel(net);
10075 nf_tables_commit_audit_free(&adl);
10076 return ret;
10077 }
10078 if (trans->msg_type == NFT_MSG_NEWRULE ||
10079 trans->msg_type == NFT_MSG_DELRULE) {
10080 chain = trans->ctx.chain;
10081
10082 ret = nf_tables_commit_chain_prepare(net, chain);
10083 if (ret < 0) {
10084 nf_tables_commit_chain_prepare_cancel(net);
10085 nf_tables_commit_audit_free(&adl);
10086 return ret;
10087 }
10088 }
10089 }
10090
10091 /* step 2. Make rules_gen_X visible to packet path */
10092 list_for_each_entry(table, &nft_net->tables, list) {
10093 list_for_each_entry(chain, &table->chains, list)
10094 nf_tables_commit_chain(net, chain);
10095 }
10096
10097 /*
10098 * Bump generation counter, invalidate any dump in progress.
10099 * Cannot fail after this point.
10100 */
10101 base_seq = READ_ONCE(nft_net->base_seq);
10102 while (++base_seq == 0)
10103 ;
10104
10105 WRITE_ONCE(nft_net->base_seq, base_seq);
10106
10107 gc_seq = nft_gc_seq_begin(nft_net);
10108
10109 /* step 3. Start new generation, rules_gen_X now in use. */
10110 net->nft.gencursor = nft_gencursor_next(net);
10111
10112 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10113 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10114 trans->msg_type);
10115 switch (trans->msg_type) {
10116 case NFT_MSG_NEWTABLE:
10117 if (nft_trans_table_update(trans)) {
10118 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10119 nft_trans_destroy(trans);
10120 break;
10121 }
10122 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10123 nf_tables_table_disable(net, trans->ctx.table);
10124
10125 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10126 } else {
10127 nft_clear(net, trans->ctx.table);
10128 }
10129 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10130 nft_trans_destroy(trans);
10131 break;
10132 case NFT_MSG_DELTABLE:
10133 case NFT_MSG_DESTROYTABLE:
10134 list_del_rcu(&trans->ctx.table->list);
10135 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10136 break;
10137 case NFT_MSG_NEWCHAIN:
10138 if (nft_trans_chain_update(trans)) {
10139 nft_chain_commit_update(trans);
10140 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10141 &nft_trans_chain_hooks(trans));
10142 list_splice(&nft_trans_chain_hooks(trans),
10143 &nft_trans_basechain(trans)->hook_list);
10144 /* trans destroyed after rcu grace period */
10145 } else {
10146 nft_chain_commit_drop_policy(trans);
10147 nft_clear(net, trans->ctx.chain);
10148 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10149 nft_trans_destroy(trans);
10150 }
10151 break;
10152 case NFT_MSG_DELCHAIN:
10153 case NFT_MSG_DESTROYCHAIN:
10154 if (nft_trans_chain_update(trans)) {
10155 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10156 &nft_trans_chain_hooks(trans));
10157 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10158 nft_netdev_unregister_hooks(net,
10159 &nft_trans_chain_hooks(trans),
10160 true);
10161 }
10162 } else {
10163 nft_chain_del(trans->ctx.chain);
10164 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10165 NULL);
10166 nf_tables_unregister_hook(trans->ctx.net,
10167 trans->ctx.table,
10168 trans->ctx.chain);
10169 }
10170 break;
10171 case NFT_MSG_NEWRULE:
10172 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10173 nf_tables_rule_notify(&trans->ctx,
10174 nft_trans_rule(trans),
10175 NFT_MSG_NEWRULE);
10176 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10177 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10178
10179 nft_trans_destroy(trans);
10180 break;
10181 case NFT_MSG_DELRULE:
10182 case NFT_MSG_DESTROYRULE:
10183 list_del_rcu(&nft_trans_rule(trans)->list);
10184 nf_tables_rule_notify(&trans->ctx,
10185 nft_trans_rule(trans),
10186 trans->msg_type);
10187 nft_rule_expr_deactivate(&trans->ctx,
10188 nft_trans_rule(trans),
10189 NFT_TRANS_COMMIT);
10190
10191 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10192 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10193 break;
10194 case NFT_MSG_NEWSET:
10195 if (nft_trans_set_update(trans)) {
10196 struct nft_set *set = nft_trans_set(trans);
10197
10198 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10199 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10200
10201 if (nft_trans_set_size(trans))
10202 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10203 } else {
10204 nft_clear(net, nft_trans_set(trans));
10205 /* This avoids hitting -EBUSY when deleting the table
10206 * from the transaction.
10207 */
10208 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10209 !list_empty(&nft_trans_set(trans)->bindings))
10210 nft_use_dec(&trans->ctx.table->use);
10211 }
10212 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10213 NFT_MSG_NEWSET, GFP_KERNEL);
10214 nft_trans_destroy(trans);
10215 break;
10216 case NFT_MSG_DELSET:
10217 case NFT_MSG_DESTROYSET:
10218 nft_trans_set(trans)->dead = 1;
10219 list_del_rcu(&nft_trans_set(trans)->list);
10220 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10221 trans->msg_type, GFP_KERNEL);
10222 break;
10223 case NFT_MSG_NEWSETELEM:
10224 te = (struct nft_trans_elem *)trans->data;
10225
10226 nft_setelem_activate(net, te->set, &te->elem);
10227 nf_tables_setelem_notify(&trans->ctx, te->set,
10228 &te->elem,
10229 NFT_MSG_NEWSETELEM);
10230 if (te->set->ops->commit &&
10231 list_empty(&te->set->pending_update)) {
10232 list_add_tail(&te->set->pending_update,
10233 &set_update_list);
10234 }
10235 nft_trans_destroy(trans);
10236 break;
10237 case NFT_MSG_DELSETELEM:
10238 case NFT_MSG_DESTROYSETELEM:
10239 te = (struct nft_trans_elem *)trans->data;
10240
10241 nf_tables_setelem_notify(&trans->ctx, te->set,
10242 &te->elem,
10243 trans->msg_type);
10244 nft_setelem_remove(net, te->set, &te->elem);
10245 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10246 atomic_dec(&te->set->nelems);
10247 te->set->ndeact--;
10248 }
10249 if (te->set->ops->commit &&
10250 list_empty(&te->set->pending_update)) {
10251 list_add_tail(&te->set->pending_update,
10252 &set_update_list);
10253 }
10254 break;
10255 case NFT_MSG_NEWOBJ:
10256 if (nft_trans_obj_update(trans)) {
10257 nft_obj_commit_update(trans);
10258 nf_tables_obj_notify(&trans->ctx,
10259 nft_trans_obj(trans),
10260 NFT_MSG_NEWOBJ);
10261 } else {
10262 nft_clear(net, nft_trans_obj(trans));
10263 nf_tables_obj_notify(&trans->ctx,
10264 nft_trans_obj(trans),
10265 NFT_MSG_NEWOBJ);
10266 nft_trans_destroy(trans);
10267 }
10268 break;
10269 case NFT_MSG_DELOBJ:
10270 case NFT_MSG_DESTROYOBJ:
10271 nft_obj_del(nft_trans_obj(trans));
10272 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10273 trans->msg_type);
10274 break;
10275 case NFT_MSG_NEWFLOWTABLE:
10276 if (nft_trans_flowtable_update(trans)) {
10277 nft_trans_flowtable(trans)->data.flags =
10278 nft_trans_flowtable_flags(trans);
10279 nf_tables_flowtable_notify(&trans->ctx,
10280 nft_trans_flowtable(trans),
10281 &nft_trans_flowtable_hooks(trans),
10282 NFT_MSG_NEWFLOWTABLE);
10283 list_splice(&nft_trans_flowtable_hooks(trans),
10284 &nft_trans_flowtable(trans)->hook_list);
10285 } else {
10286 nft_clear(net, nft_trans_flowtable(trans));
10287 nf_tables_flowtable_notify(&trans->ctx,
10288 nft_trans_flowtable(trans),
10289 NULL,
10290 NFT_MSG_NEWFLOWTABLE);
10291 }
10292 nft_trans_destroy(trans);
10293 break;
10294 case NFT_MSG_DELFLOWTABLE:
10295 case NFT_MSG_DESTROYFLOWTABLE:
10296 if (nft_trans_flowtable_update(trans)) {
10297 nf_tables_flowtable_notify(&trans->ctx,
10298 nft_trans_flowtable(trans),
10299 &nft_trans_flowtable_hooks(trans),
10300 trans->msg_type);
10301 nft_unregister_flowtable_net_hooks(net,
10302 &nft_trans_flowtable_hooks(trans));
10303 } else {
10304 list_del_rcu(&nft_trans_flowtable(trans)->list);
10305 nf_tables_flowtable_notify(&trans->ctx,
10306 nft_trans_flowtable(trans),
10307 NULL,
10308 trans->msg_type);
10309 nft_unregister_flowtable_net_hooks(net,
10310 &nft_trans_flowtable(trans)->hook_list);
10311 }
10312 break;
10313 }
10314 }
10315
10316 nft_set_commit_update(&set_update_list);
10317
10318 nft_commit_notify(net, NETLINK_CB(skb).portid);
10319 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10320 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10321
10322 nft_gc_seq_end(nft_net, gc_seq);
10323 nft_net->validate_state = NFT_VALIDATE_SKIP;
10324 nf_tables_commit_release(net);
10325
10326 return 0;
10327 }
10328
nf_tables_module_autoload(struct net * net)10329 static void nf_tables_module_autoload(struct net *net)
10330 {
10331 struct nftables_pernet *nft_net = nft_pernet(net);
10332 struct nft_module_request *req, *next;
10333 LIST_HEAD(module_list);
10334
10335 list_splice_init(&nft_net->module_list, &module_list);
10336 mutex_unlock(&nft_net->commit_mutex);
10337 list_for_each_entry_safe(req, next, &module_list, list) {
10338 request_module("%s", req->module);
10339 req->done = true;
10340 }
10341 mutex_lock(&nft_net->commit_mutex);
10342 list_splice(&module_list, &nft_net->module_list);
10343 }
10344
nf_tables_abort_release(struct nft_trans * trans)10345 static void nf_tables_abort_release(struct nft_trans *trans)
10346 {
10347 switch (trans->msg_type) {
10348 case NFT_MSG_NEWTABLE:
10349 nf_tables_table_destroy(&trans->ctx);
10350 break;
10351 case NFT_MSG_NEWCHAIN:
10352 if (nft_trans_chain_update(trans))
10353 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10354 else
10355 nf_tables_chain_destroy(&trans->ctx);
10356 break;
10357 case NFT_MSG_NEWRULE:
10358 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10359 break;
10360 case NFT_MSG_NEWSET:
10361 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10362 break;
10363 case NFT_MSG_NEWSETELEM:
10364 nft_set_elem_destroy(nft_trans_elem_set(trans),
10365 nft_trans_elem(trans).priv, true);
10366 break;
10367 case NFT_MSG_NEWOBJ:
10368 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10369 break;
10370 case NFT_MSG_NEWFLOWTABLE:
10371 if (nft_trans_flowtable_update(trans))
10372 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10373 else
10374 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10375 break;
10376 }
10377 kfree(trans);
10378 }
10379
nft_set_abort_update(struct list_head * set_update_list)10380 static void nft_set_abort_update(struct list_head *set_update_list)
10381 {
10382 struct nft_set *set, *next;
10383
10384 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10385 list_del_init(&set->pending_update);
10386
10387 if (!set->ops->abort)
10388 continue;
10389
10390 set->ops->abort(set);
10391 }
10392 }
10393
__nf_tables_abort(struct net * net,enum nfnl_abort_action action)10394 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10395 {
10396 struct nftables_pernet *nft_net = nft_pernet(net);
10397 struct nft_trans *trans, *next;
10398 LIST_HEAD(set_update_list);
10399 struct nft_trans_elem *te;
10400 int err = 0;
10401
10402 if (action == NFNL_ABORT_VALIDATE &&
10403 nf_tables_validate(net) < 0)
10404 err = -EAGAIN;
10405
10406 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10407 list) {
10408 switch (trans->msg_type) {
10409 case NFT_MSG_NEWTABLE:
10410 if (nft_trans_table_update(trans)) {
10411 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10412 nft_trans_destroy(trans);
10413 break;
10414 }
10415 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10416 nf_tables_table_disable(net, trans->ctx.table);
10417 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10418 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10419 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10420 }
10421 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10422 nft_trans_destroy(trans);
10423 } else {
10424 list_del_rcu(&trans->ctx.table->list);
10425 }
10426 break;
10427 case NFT_MSG_DELTABLE:
10428 case NFT_MSG_DESTROYTABLE:
10429 nft_clear(trans->ctx.net, trans->ctx.table);
10430 nft_trans_destroy(trans);
10431 break;
10432 case NFT_MSG_NEWCHAIN:
10433 if (nft_trans_chain_update(trans)) {
10434 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10435 nft_netdev_unregister_hooks(net,
10436 &nft_trans_chain_hooks(trans),
10437 true);
10438 }
10439 free_percpu(nft_trans_chain_stats(trans));
10440 kfree(nft_trans_chain_name(trans));
10441 nft_trans_destroy(trans);
10442 } else {
10443 if (nft_trans_chain_bound(trans)) {
10444 nft_trans_destroy(trans);
10445 break;
10446 }
10447 nft_use_dec_restore(&trans->ctx.table->use);
10448 nft_chain_del(trans->ctx.chain);
10449 nf_tables_unregister_hook(trans->ctx.net,
10450 trans->ctx.table,
10451 trans->ctx.chain);
10452 }
10453 break;
10454 case NFT_MSG_DELCHAIN:
10455 case NFT_MSG_DESTROYCHAIN:
10456 if (nft_trans_chain_update(trans)) {
10457 list_splice(&nft_trans_chain_hooks(trans),
10458 &nft_trans_basechain(trans)->hook_list);
10459 } else {
10460 nft_use_inc_restore(&trans->ctx.table->use);
10461 nft_clear(trans->ctx.net, trans->ctx.chain);
10462 }
10463 nft_trans_destroy(trans);
10464 break;
10465 case NFT_MSG_NEWRULE:
10466 if (nft_trans_rule_bound(trans)) {
10467 nft_trans_destroy(trans);
10468 break;
10469 }
10470 nft_use_dec_restore(&trans->ctx.chain->use);
10471 list_del_rcu(&nft_trans_rule(trans)->list);
10472 nft_rule_expr_deactivate(&trans->ctx,
10473 nft_trans_rule(trans),
10474 NFT_TRANS_ABORT);
10475 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10476 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10477 break;
10478 case NFT_MSG_DELRULE:
10479 case NFT_MSG_DESTROYRULE:
10480 nft_use_inc_restore(&trans->ctx.chain->use);
10481 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10482 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10483 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10484 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10485
10486 nft_trans_destroy(trans);
10487 break;
10488 case NFT_MSG_NEWSET:
10489 if (nft_trans_set_update(trans)) {
10490 nft_trans_destroy(trans);
10491 break;
10492 }
10493 nft_use_dec_restore(&trans->ctx.table->use);
10494 if (nft_trans_set_bound(trans)) {
10495 nft_trans_destroy(trans);
10496 break;
10497 }
10498 nft_trans_set(trans)->dead = 1;
10499 list_del_rcu(&nft_trans_set(trans)->list);
10500 break;
10501 case NFT_MSG_DELSET:
10502 case NFT_MSG_DESTROYSET:
10503 nft_use_inc_restore(&trans->ctx.table->use);
10504 nft_clear(trans->ctx.net, nft_trans_set(trans));
10505 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10506 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10507
10508 nft_trans_destroy(trans);
10509 break;
10510 case NFT_MSG_NEWSETELEM:
10511 if (nft_trans_elem_set_bound(trans)) {
10512 nft_trans_destroy(trans);
10513 break;
10514 }
10515 te = (struct nft_trans_elem *)trans->data;
10516 nft_setelem_remove(net, te->set, &te->elem);
10517 if (!nft_setelem_is_catchall(te->set, &te->elem))
10518 atomic_dec(&te->set->nelems);
10519
10520 if (te->set->ops->abort &&
10521 list_empty(&te->set->pending_update)) {
10522 list_add_tail(&te->set->pending_update,
10523 &set_update_list);
10524 }
10525 break;
10526 case NFT_MSG_DELSETELEM:
10527 case NFT_MSG_DESTROYSETELEM:
10528 te = (struct nft_trans_elem *)trans->data;
10529
10530 nft_setelem_data_activate(net, te->set, &te->elem);
10531 nft_setelem_activate(net, te->set, &te->elem);
10532 if (!nft_setelem_is_catchall(te->set, &te->elem))
10533 te->set->ndeact--;
10534
10535 if (te->set->ops->abort &&
10536 list_empty(&te->set->pending_update)) {
10537 list_add_tail(&te->set->pending_update,
10538 &set_update_list);
10539 }
10540 nft_trans_destroy(trans);
10541 break;
10542 case NFT_MSG_NEWOBJ:
10543 if (nft_trans_obj_update(trans)) {
10544 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10545 nft_trans_destroy(trans);
10546 } else {
10547 nft_use_dec_restore(&trans->ctx.table->use);
10548 nft_obj_del(nft_trans_obj(trans));
10549 }
10550 break;
10551 case NFT_MSG_DELOBJ:
10552 case NFT_MSG_DESTROYOBJ:
10553 nft_use_inc_restore(&trans->ctx.table->use);
10554 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10555 nft_trans_destroy(trans);
10556 break;
10557 case NFT_MSG_NEWFLOWTABLE:
10558 if (nft_trans_flowtable_update(trans)) {
10559 nft_unregister_flowtable_net_hooks(net,
10560 &nft_trans_flowtable_hooks(trans));
10561 } else {
10562 nft_use_dec_restore(&trans->ctx.table->use);
10563 list_del_rcu(&nft_trans_flowtable(trans)->list);
10564 nft_unregister_flowtable_net_hooks(net,
10565 &nft_trans_flowtable(trans)->hook_list);
10566 }
10567 break;
10568 case NFT_MSG_DELFLOWTABLE:
10569 case NFT_MSG_DESTROYFLOWTABLE:
10570 if (nft_trans_flowtable_update(trans)) {
10571 list_splice(&nft_trans_flowtable_hooks(trans),
10572 &nft_trans_flowtable(trans)->hook_list);
10573 } else {
10574 nft_use_inc_restore(&trans->ctx.table->use);
10575 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10576 }
10577 nft_trans_destroy(trans);
10578 break;
10579 }
10580 }
10581
10582 nft_set_abort_update(&set_update_list);
10583
10584 synchronize_rcu();
10585
10586 list_for_each_entry_safe_reverse(trans, next,
10587 &nft_net->commit_list, list) {
10588 nft_trans_list_del(trans);
10589 nf_tables_abort_release(trans);
10590 }
10591
10592 return err;
10593 }
10594
nf_tables_abort(struct net * net,struct sk_buff * skb,enum nfnl_abort_action action)10595 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10596 enum nfnl_abort_action action)
10597 {
10598 struct nftables_pernet *nft_net = nft_pernet(net);
10599 unsigned int gc_seq;
10600 int ret;
10601
10602 gc_seq = nft_gc_seq_begin(nft_net);
10603 ret = __nf_tables_abort(net, action);
10604 nft_gc_seq_end(nft_net, gc_seq);
10605
10606 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10607
10608 /* module autoload needs to happen after GC sequence update because it
10609 * temporarily releases and grabs mutex again.
10610 */
10611 if (action == NFNL_ABORT_AUTOLOAD)
10612 nf_tables_module_autoload(net);
10613 else
10614 nf_tables_module_autoload_cleanup(net);
10615
10616 mutex_unlock(&nft_net->commit_mutex);
10617
10618 return ret;
10619 }
10620
nf_tables_valid_genid(struct net * net,u32 genid)10621 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10622 {
10623 struct nftables_pernet *nft_net = nft_pernet(net);
10624 bool genid_ok;
10625
10626 mutex_lock(&nft_net->commit_mutex);
10627
10628 genid_ok = genid == 0 || nft_net->base_seq == genid;
10629 if (!genid_ok)
10630 mutex_unlock(&nft_net->commit_mutex);
10631
10632 /* else, commit mutex has to be released by commit or abort function */
10633 return genid_ok;
10634 }
10635
10636 static const struct nfnetlink_subsystem nf_tables_subsys = {
10637 .name = "nf_tables",
10638 .subsys_id = NFNL_SUBSYS_NFTABLES,
10639 .cb_count = NFT_MSG_MAX,
10640 .cb = nf_tables_cb,
10641 .commit = nf_tables_commit,
10642 .abort = nf_tables_abort,
10643 .valid_genid = nf_tables_valid_genid,
10644 .owner = THIS_MODULE,
10645 };
10646
nft_chain_validate_dependency(const struct nft_chain * chain,enum nft_chain_types type)10647 int nft_chain_validate_dependency(const struct nft_chain *chain,
10648 enum nft_chain_types type)
10649 {
10650 const struct nft_base_chain *basechain;
10651
10652 if (nft_is_base_chain(chain)) {
10653 basechain = nft_base_chain(chain);
10654 if (basechain->type->type != type)
10655 return -EOPNOTSUPP;
10656 }
10657 return 0;
10658 }
10659 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10660
nft_chain_validate_hooks(const struct nft_chain * chain,unsigned int hook_flags)10661 int nft_chain_validate_hooks(const struct nft_chain *chain,
10662 unsigned int hook_flags)
10663 {
10664 struct nft_base_chain *basechain;
10665
10666 if (nft_is_base_chain(chain)) {
10667 basechain = nft_base_chain(chain);
10668
10669 if ((1 << basechain->ops.hooknum) & hook_flags)
10670 return 0;
10671
10672 return -EOPNOTSUPP;
10673 }
10674
10675 return 0;
10676 }
10677 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10678
10679 /**
10680 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10681 *
10682 * @attr: netlink attribute to fetch value from
10683 * @max: maximum value to be stored in dest
10684 * @dest: pointer to the variable
10685 *
10686 * Parse, check and store a given u32 netlink attribute into variable.
10687 * This function returns -ERANGE if the value goes over maximum value.
10688 * Otherwise a 0 is returned and the attribute value is stored in the
10689 * destination variable.
10690 */
nft_parse_u32_check(const struct nlattr * attr,int max,u32 * dest)10691 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10692 {
10693 u32 val;
10694
10695 val = ntohl(nla_get_be32(attr));
10696 if (val > max)
10697 return -ERANGE;
10698
10699 *dest = val;
10700 return 0;
10701 }
10702 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10703
nft_parse_register(const struct nlattr * attr,u32 * preg)10704 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10705 {
10706 unsigned int reg;
10707
10708 reg = ntohl(nla_get_be32(attr));
10709 switch (reg) {
10710 case NFT_REG_VERDICT...NFT_REG_4:
10711 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10712 break;
10713 case NFT_REG32_00...NFT_REG32_15:
10714 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10715 break;
10716 default:
10717 return -ERANGE;
10718 }
10719
10720 return 0;
10721 }
10722
10723 /**
10724 * nft_dump_register - dump a register value to a netlink attribute
10725 *
10726 * @skb: socket buffer
10727 * @attr: attribute number
10728 * @reg: register number
10729 *
10730 * Construct a netlink attribute containing the register number. For
10731 * compatibility reasons, register numbers being a multiple of 4 are
10732 * translated to the corresponding 128 bit register numbers.
10733 */
nft_dump_register(struct sk_buff * skb,unsigned int attr,unsigned int reg)10734 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10735 {
10736 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10737 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10738 else
10739 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10740
10741 return nla_put_be32(skb, attr, htonl(reg));
10742 }
10743 EXPORT_SYMBOL_GPL(nft_dump_register);
10744
nft_validate_register_load(enum nft_registers reg,unsigned int len)10745 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10746 {
10747 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10748 return -EINVAL;
10749 if (len == 0)
10750 return -EINVAL;
10751 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10752 return -ERANGE;
10753
10754 return 0;
10755 }
10756
nft_parse_register_load(const struct nlattr * attr,u8 * sreg,u32 len)10757 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10758 {
10759 u32 reg;
10760 int err;
10761
10762 err = nft_parse_register(attr, ®);
10763 if (err < 0)
10764 return err;
10765
10766 err = nft_validate_register_load(reg, len);
10767 if (err < 0)
10768 return err;
10769
10770 *sreg = reg;
10771 return 0;
10772 }
10773 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10774
nft_validate_register_store(const struct nft_ctx * ctx,enum nft_registers reg,const struct nft_data * data,enum nft_data_types type,unsigned int len)10775 static int nft_validate_register_store(const struct nft_ctx *ctx,
10776 enum nft_registers reg,
10777 const struct nft_data *data,
10778 enum nft_data_types type,
10779 unsigned int len)
10780 {
10781 int err;
10782
10783 switch (reg) {
10784 case NFT_REG_VERDICT:
10785 if (type != NFT_DATA_VERDICT)
10786 return -EINVAL;
10787
10788 if (data != NULL &&
10789 (data->verdict.code == NFT_GOTO ||
10790 data->verdict.code == NFT_JUMP)) {
10791 err = nft_chain_validate(ctx, data->verdict.chain);
10792 if (err < 0)
10793 return err;
10794 }
10795
10796 return 0;
10797 default:
10798 if (type != NFT_DATA_VALUE)
10799 return -EINVAL;
10800
10801 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10802 return -EINVAL;
10803 if (len == 0)
10804 return -EINVAL;
10805 if (reg * NFT_REG32_SIZE + len >
10806 sizeof_field(struct nft_regs, data))
10807 return -ERANGE;
10808
10809 return 0;
10810 }
10811 }
10812
nft_parse_register_store(const struct nft_ctx * ctx,const struct nlattr * attr,u8 * dreg,const struct nft_data * data,enum nft_data_types type,unsigned int len)10813 int nft_parse_register_store(const struct nft_ctx *ctx,
10814 const struct nlattr *attr, u8 *dreg,
10815 const struct nft_data *data,
10816 enum nft_data_types type, unsigned int len)
10817 {
10818 int err;
10819 u32 reg;
10820
10821 err = nft_parse_register(attr, ®);
10822 if (err < 0)
10823 return err;
10824
10825 err = nft_validate_register_store(ctx, reg, data, type, len);
10826 if (err < 0)
10827 return err;
10828
10829 *dreg = reg;
10830 return 0;
10831 }
10832 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10833
10834 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10835 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10836 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10837 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10838 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10839 };
10840
nft_verdict_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10841 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10842 struct nft_data_desc *desc, const struct nlattr *nla)
10843 {
10844 u8 genmask = nft_genmask_next(ctx->net);
10845 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10846 struct nft_chain *chain;
10847 int err;
10848
10849 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10850 nft_verdict_policy, NULL);
10851 if (err < 0)
10852 return err;
10853
10854 if (!tb[NFTA_VERDICT_CODE])
10855 return -EINVAL;
10856
10857 /* zero padding hole for memcmp */
10858 memset(data, 0, sizeof(*data));
10859 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10860
10861 switch (data->verdict.code) {
10862 case NF_ACCEPT:
10863 case NF_DROP:
10864 case NF_QUEUE:
10865 break;
10866 case NFT_CONTINUE:
10867 case NFT_BREAK:
10868 case NFT_RETURN:
10869 break;
10870 case NFT_JUMP:
10871 case NFT_GOTO:
10872 if (tb[NFTA_VERDICT_CHAIN]) {
10873 chain = nft_chain_lookup(ctx->net, ctx->table,
10874 tb[NFTA_VERDICT_CHAIN],
10875 genmask);
10876 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10877 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10878 tb[NFTA_VERDICT_CHAIN_ID],
10879 genmask);
10880 if (IS_ERR(chain))
10881 return PTR_ERR(chain);
10882 } else {
10883 return -EINVAL;
10884 }
10885
10886 if (IS_ERR(chain))
10887 return PTR_ERR(chain);
10888 if (nft_is_base_chain(chain))
10889 return -EOPNOTSUPP;
10890 if (nft_chain_is_bound(chain))
10891 return -EINVAL;
10892 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10893 chain->flags & NFT_CHAIN_BINDING)
10894 return -EINVAL;
10895 if (!nft_use_inc(&chain->use))
10896 return -EMFILE;
10897
10898 data->verdict.chain = chain;
10899 break;
10900 default:
10901 return -EINVAL;
10902 }
10903
10904 desc->len = sizeof(data->verdict);
10905
10906 return 0;
10907 }
10908
nft_verdict_uninit(const struct nft_data * data)10909 static void nft_verdict_uninit(const struct nft_data *data)
10910 {
10911 struct nft_chain *chain;
10912
10913 switch (data->verdict.code) {
10914 case NFT_JUMP:
10915 case NFT_GOTO:
10916 chain = data->verdict.chain;
10917 nft_use_dec(&chain->use);
10918 break;
10919 }
10920 }
10921
nft_verdict_dump(struct sk_buff * skb,int type,const struct nft_verdict * v)10922 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10923 {
10924 struct nlattr *nest;
10925
10926 nest = nla_nest_start_noflag(skb, type);
10927 if (!nest)
10928 goto nla_put_failure;
10929
10930 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10931 goto nla_put_failure;
10932
10933 switch (v->code) {
10934 case NFT_JUMP:
10935 case NFT_GOTO:
10936 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10937 v->chain->name))
10938 goto nla_put_failure;
10939 }
10940 nla_nest_end(skb, nest);
10941 return 0;
10942
10943 nla_put_failure:
10944 return -1;
10945 }
10946
nft_value_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10947 static int nft_value_init(const struct nft_ctx *ctx,
10948 struct nft_data *data, struct nft_data_desc *desc,
10949 const struct nlattr *nla)
10950 {
10951 unsigned int len;
10952
10953 len = nla_len(nla);
10954 if (len == 0)
10955 return -EINVAL;
10956 if (len > desc->size)
10957 return -EOVERFLOW;
10958 if (desc->len) {
10959 if (len != desc->len)
10960 return -EINVAL;
10961 } else {
10962 desc->len = len;
10963 }
10964
10965 nla_memcpy(data->data, nla, len);
10966
10967 return 0;
10968 }
10969
nft_value_dump(struct sk_buff * skb,const struct nft_data * data,unsigned int len)10970 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10971 unsigned int len)
10972 {
10973 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10974 }
10975
10976 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10977 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10978 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10979 };
10980
10981 /**
10982 * nft_data_init - parse nf_tables data netlink attributes
10983 *
10984 * @ctx: context of the expression using the data
10985 * @data: destination struct nft_data
10986 * @desc: data description
10987 * @nla: netlink attribute containing data
10988 *
10989 * Parse the netlink data attributes and initialize a struct nft_data.
10990 * The type and length of data are returned in the data description.
10991 *
10992 * The caller can indicate that it only wants to accept data of type
10993 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10994 */
nft_data_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10995 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10996 struct nft_data_desc *desc, const struct nlattr *nla)
10997 {
10998 struct nlattr *tb[NFTA_DATA_MAX + 1];
10999 int err;
11000
11001 if (WARN_ON_ONCE(!desc->size))
11002 return -EINVAL;
11003
11004 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11005 nft_data_policy, NULL);
11006 if (err < 0)
11007 return err;
11008
11009 if (tb[NFTA_DATA_VALUE]) {
11010 if (desc->type != NFT_DATA_VALUE)
11011 return -EINVAL;
11012
11013 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11014 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11015 if (desc->type != NFT_DATA_VERDICT)
11016 return -EINVAL;
11017
11018 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11019 } else {
11020 err = -EINVAL;
11021 }
11022
11023 return err;
11024 }
11025 EXPORT_SYMBOL_GPL(nft_data_init);
11026
11027 /**
11028 * nft_data_release - release a nft_data item
11029 *
11030 * @data: struct nft_data to release
11031 * @type: type of data
11032 *
11033 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11034 * all others need to be released by calling this function.
11035 */
nft_data_release(const struct nft_data * data,enum nft_data_types type)11036 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11037 {
11038 if (type < NFT_DATA_VERDICT)
11039 return;
11040 switch (type) {
11041 case NFT_DATA_VERDICT:
11042 return nft_verdict_uninit(data);
11043 default:
11044 WARN_ON(1);
11045 }
11046 }
11047 EXPORT_SYMBOL_GPL(nft_data_release);
11048
nft_data_dump(struct sk_buff * skb,int attr,const struct nft_data * data,enum nft_data_types type,unsigned int len)11049 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11050 enum nft_data_types type, unsigned int len)
11051 {
11052 struct nlattr *nest;
11053 int err;
11054
11055 nest = nla_nest_start_noflag(skb, attr);
11056 if (nest == NULL)
11057 return -1;
11058
11059 switch (type) {
11060 case NFT_DATA_VALUE:
11061 err = nft_value_dump(skb, data, len);
11062 break;
11063 case NFT_DATA_VERDICT:
11064 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11065 break;
11066 default:
11067 err = -EINVAL;
11068 WARN_ON(1);
11069 }
11070
11071 nla_nest_end(skb, nest);
11072 return err;
11073 }
11074 EXPORT_SYMBOL_GPL(nft_data_dump);
11075
__nft_release_basechain(struct nft_ctx * ctx)11076 int __nft_release_basechain(struct nft_ctx *ctx)
11077 {
11078 struct nft_rule *rule, *nr;
11079
11080 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11081 return 0;
11082
11083 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11084 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11085 list_del(&rule->list);
11086 nft_use_dec(&ctx->chain->use);
11087 nf_tables_rule_release(ctx, rule);
11088 }
11089 nft_chain_del(ctx->chain);
11090 nft_use_dec(&ctx->table->use);
11091 nf_tables_chain_destroy(ctx);
11092
11093 return 0;
11094 }
11095 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11096
__nft_release_hook(struct net * net,struct nft_table * table)11097 static void __nft_release_hook(struct net *net, struct nft_table *table)
11098 {
11099 struct nft_flowtable *flowtable;
11100 struct nft_chain *chain;
11101
11102 list_for_each_entry(chain, &table->chains, list)
11103 __nf_tables_unregister_hook(net, table, chain, true);
11104 list_for_each_entry(flowtable, &table->flowtables, list)
11105 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11106 true);
11107 }
11108
__nft_release_hooks(struct net * net)11109 static void __nft_release_hooks(struct net *net)
11110 {
11111 struct nftables_pernet *nft_net = nft_pernet(net);
11112 struct nft_table *table;
11113
11114 list_for_each_entry(table, &nft_net->tables, list) {
11115 if (nft_table_has_owner(table))
11116 continue;
11117
11118 __nft_release_hook(net, table);
11119 }
11120 }
11121
__nft_release_table(struct net * net,struct nft_table * table)11122 static void __nft_release_table(struct net *net, struct nft_table *table)
11123 {
11124 struct nft_flowtable *flowtable, *nf;
11125 struct nft_chain *chain, *nc;
11126 struct nft_object *obj, *ne;
11127 struct nft_rule *rule, *nr;
11128 struct nft_set *set, *ns;
11129 struct nft_ctx ctx = {
11130 .net = net,
11131 .family = NFPROTO_NETDEV,
11132 };
11133
11134 ctx.family = table->family;
11135 ctx.table = table;
11136 list_for_each_entry(chain, &table->chains, list) {
11137 if (nft_chain_binding(chain))
11138 continue;
11139
11140 ctx.chain = chain;
11141 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11142 list_del(&rule->list);
11143 nft_use_dec(&chain->use);
11144 nf_tables_rule_release(&ctx, rule);
11145 }
11146 }
11147 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11148 list_del(&flowtable->list);
11149 nft_use_dec(&table->use);
11150 nf_tables_flowtable_destroy(flowtable);
11151 }
11152 list_for_each_entry_safe(set, ns, &table->sets, list) {
11153 list_del(&set->list);
11154 nft_use_dec(&table->use);
11155 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11156 nft_map_deactivate(&ctx, set);
11157
11158 nft_set_destroy(&ctx, set);
11159 }
11160 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11161 nft_obj_del(obj);
11162 nft_use_dec(&table->use);
11163 nft_obj_destroy(&ctx, obj);
11164 }
11165 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11166 ctx.chain = chain;
11167 nft_chain_del(chain);
11168 nft_use_dec(&table->use);
11169 nf_tables_chain_destroy(&ctx);
11170 }
11171 nf_tables_table_destroy(&ctx);
11172 }
11173
__nft_release_tables(struct net * net)11174 static void __nft_release_tables(struct net *net)
11175 {
11176 struct nftables_pernet *nft_net = nft_pernet(net);
11177 struct nft_table *table, *nt;
11178
11179 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11180 if (nft_table_has_owner(table))
11181 continue;
11182
11183 list_del(&table->list);
11184
11185 __nft_release_table(net, table);
11186 }
11187 }
11188
nft_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)11189 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11190 void *ptr)
11191 {
11192 struct nft_table *table, *to_delete[8];
11193 struct nftables_pernet *nft_net;
11194 struct netlink_notify *n = ptr;
11195 struct net *net = n->net;
11196 unsigned int deleted;
11197 bool restart = false;
11198 unsigned int gc_seq;
11199
11200 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11201 return NOTIFY_DONE;
11202
11203 nft_net = nft_pernet(net);
11204 deleted = 0;
11205 mutex_lock(&nft_net->commit_mutex);
11206
11207 gc_seq = nft_gc_seq_begin(nft_net);
11208
11209 nf_tables_trans_destroy_flush_work();
11210 again:
11211 list_for_each_entry(table, &nft_net->tables, list) {
11212 if (nft_table_has_owner(table) &&
11213 n->portid == table->nlpid) {
11214 __nft_release_hook(net, table);
11215 list_del_rcu(&table->list);
11216 to_delete[deleted++] = table;
11217 if (deleted >= ARRAY_SIZE(to_delete))
11218 break;
11219 }
11220 }
11221 if (deleted) {
11222 restart = deleted >= ARRAY_SIZE(to_delete);
11223 synchronize_rcu();
11224 while (deleted)
11225 __nft_release_table(net, to_delete[--deleted]);
11226
11227 if (restart)
11228 goto again;
11229 }
11230 nft_gc_seq_end(nft_net, gc_seq);
11231
11232 mutex_unlock(&nft_net->commit_mutex);
11233
11234 return NOTIFY_DONE;
11235 }
11236
11237 static struct notifier_block nft_nl_notifier = {
11238 .notifier_call = nft_rcv_nl_event,
11239 };
11240
nf_tables_init_net(struct net * net)11241 static int __net_init nf_tables_init_net(struct net *net)
11242 {
11243 struct nftables_pernet *nft_net = nft_pernet(net);
11244
11245 INIT_LIST_HEAD(&nft_net->tables);
11246 INIT_LIST_HEAD(&nft_net->commit_list);
11247 INIT_LIST_HEAD(&nft_net->binding_list);
11248 INIT_LIST_HEAD(&nft_net->module_list);
11249 INIT_LIST_HEAD(&nft_net->notify_list);
11250 mutex_init(&nft_net->commit_mutex);
11251 nft_net->base_seq = 1;
11252 nft_net->gc_seq = 0;
11253 nft_net->validate_state = NFT_VALIDATE_SKIP;
11254
11255 return 0;
11256 }
11257
nf_tables_pre_exit_net(struct net * net)11258 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11259 {
11260 struct nftables_pernet *nft_net = nft_pernet(net);
11261
11262 mutex_lock(&nft_net->commit_mutex);
11263 __nft_release_hooks(net);
11264 mutex_unlock(&nft_net->commit_mutex);
11265 }
11266
nf_tables_exit_net(struct net * net)11267 static void __net_exit nf_tables_exit_net(struct net *net)
11268 {
11269 struct nftables_pernet *nft_net = nft_pernet(net);
11270 unsigned int gc_seq;
11271
11272 mutex_lock(&nft_net->commit_mutex);
11273
11274 gc_seq = nft_gc_seq_begin(nft_net);
11275
11276 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11277
11278 if (!list_empty(&nft_net->module_list))
11279 nf_tables_module_autoload_cleanup(net);
11280
11281 __nft_release_tables(net);
11282
11283 nft_gc_seq_end(nft_net, gc_seq);
11284
11285 mutex_unlock(&nft_net->commit_mutex);
11286 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11287 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11288 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11289 }
11290
nf_tables_exit_batch(struct list_head * net_exit_list)11291 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11292 {
11293 flush_work(&trans_gc_work);
11294 }
11295
11296 static struct pernet_operations nf_tables_net_ops = {
11297 .init = nf_tables_init_net,
11298 .pre_exit = nf_tables_pre_exit_net,
11299 .exit = nf_tables_exit_net,
11300 .exit_batch = nf_tables_exit_batch,
11301 .id = &nf_tables_net_id,
11302 .size = sizeof(struct nftables_pernet),
11303 };
11304
nf_tables_module_init(void)11305 static int __init nf_tables_module_init(void)
11306 {
11307 int err;
11308
11309 err = register_pernet_subsys(&nf_tables_net_ops);
11310 if (err < 0)
11311 return err;
11312
11313 err = nft_chain_filter_init();
11314 if (err < 0)
11315 goto err_chain_filter;
11316
11317 err = nf_tables_core_module_init();
11318 if (err < 0)
11319 goto err_core_module;
11320
11321 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11322 if (err < 0)
11323 goto err_netdev_notifier;
11324
11325 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11326 if (err < 0)
11327 goto err_rht_objname;
11328
11329 err = nft_offload_init();
11330 if (err < 0)
11331 goto err_offload;
11332
11333 err = netlink_register_notifier(&nft_nl_notifier);
11334 if (err < 0)
11335 goto err_netlink_notifier;
11336
11337 /* must be last */
11338 err = nfnetlink_subsys_register(&nf_tables_subsys);
11339 if (err < 0)
11340 goto err_nfnl_subsys;
11341
11342 nft_chain_route_init();
11343
11344 return err;
11345
11346 err_nfnl_subsys:
11347 netlink_unregister_notifier(&nft_nl_notifier);
11348 err_netlink_notifier:
11349 nft_offload_exit();
11350 err_offload:
11351 rhltable_destroy(&nft_objname_ht);
11352 err_rht_objname:
11353 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11354 err_netdev_notifier:
11355 nf_tables_core_module_exit();
11356 err_core_module:
11357 nft_chain_filter_fini();
11358 err_chain_filter:
11359 unregister_pernet_subsys(&nf_tables_net_ops);
11360 return err;
11361 }
11362
nf_tables_module_exit(void)11363 static void __exit nf_tables_module_exit(void)
11364 {
11365 nfnetlink_subsys_unregister(&nf_tables_subsys);
11366 netlink_unregister_notifier(&nft_nl_notifier);
11367 nft_offload_exit();
11368 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11369 nft_chain_filter_fini();
11370 nft_chain_route_fini();
11371 nf_tables_trans_destroy_flush_work();
11372 unregister_pernet_subsys(&nf_tables_net_ops);
11373 cancel_work_sync(&trans_gc_work);
11374 cancel_work_sync(&trans_destroy_work);
11375 rcu_barrier();
11376 rhltable_destroy(&nft_objname_ht);
11377 nf_tables_core_module_exit();
11378 }
11379
11380 module_init(nf_tables_module_init);
11381 module_exit(nf_tables_module_exit);
11382
11383 MODULE_LICENSE("GPL");
11384 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11385 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
11386