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
nft_chain_validate(const struct nft_ctx * ctx,const struct nft_chain * chain)3746 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3747 {
3748 struct nft_expr *expr, *last;
3749 const struct nft_data *data;
3750 struct nft_rule *rule;
3751 int err;
3752
3753 if (ctx->level == NFT_JUMP_STACK_SIZE)
3754 return -EMLINK;
3755
3756 list_for_each_entry(rule, &chain->rules, list) {
3757 if (fatal_signal_pending(current))
3758 return -EINTR;
3759
3760 if (!nft_is_active_next(ctx->net, rule))
3761 continue;
3762
3763 nft_rule_for_each_expr(expr, last, rule) {
3764 if (!expr->ops->validate)
3765 continue;
3766
3767 err = expr->ops->validate(ctx, expr, &data);
3768 if (err < 0)
3769 return err;
3770 }
3771 }
3772
3773 return 0;
3774 }
3775 EXPORT_SYMBOL_GPL(nft_chain_validate);
3776
nft_table_validate(struct net * net,const struct nft_table * table)3777 static int nft_table_validate(struct net *net, const struct nft_table *table)
3778 {
3779 struct nft_chain *chain;
3780 struct nft_ctx ctx = {
3781 .net = net,
3782 .family = table->family,
3783 };
3784 int err;
3785
3786 list_for_each_entry(chain, &table->chains, list) {
3787 if (!nft_is_base_chain(chain))
3788 continue;
3789
3790 ctx.chain = chain;
3791 err = nft_chain_validate(&ctx, chain);
3792 if (err < 0)
3793 return err;
3794
3795 cond_resched();
3796 }
3797
3798 return 0;
3799 }
3800
nft_setelem_validate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)3801 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3802 const struct nft_set_iter *iter,
3803 struct nft_set_elem *elem)
3804 {
3805 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3806 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3807 const struct nft_data *data;
3808 int err;
3809
3810 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3811 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3812 return 0;
3813
3814 data = nft_set_ext_data(ext);
3815 switch (data->verdict.code) {
3816 case NFT_JUMP:
3817 case NFT_GOTO:
3818 pctx->level++;
3819 err = nft_chain_validate(ctx, data->verdict.chain);
3820 if (err < 0)
3821 return err;
3822 pctx->level--;
3823 break;
3824 default:
3825 break;
3826 }
3827
3828 return 0;
3829 }
3830
nft_set_catchall_validate(const struct nft_ctx * ctx,struct nft_set * set)3831 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3832 {
3833 u8 genmask = nft_genmask_next(ctx->net);
3834 struct nft_set_elem_catchall *catchall;
3835 struct nft_set_elem elem;
3836 struct nft_set_ext *ext;
3837 int ret = 0;
3838
3839 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3840 ext = nft_set_elem_ext(set, catchall->elem);
3841 if (!nft_set_elem_active(ext, genmask))
3842 continue;
3843
3844 elem.priv = catchall->elem;
3845 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3846 if (ret < 0)
3847 return ret;
3848 }
3849
3850 return ret;
3851 }
3852
3853 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3854 const struct nft_chain *chain,
3855 const struct nlattr *nla);
3856
3857 #define NFT_RULE_MAXEXPRS 128
3858
nf_tables_newrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3859 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3860 const struct nlattr * const nla[])
3861 {
3862 struct nftables_pernet *nft_net = nft_pernet(info->net);
3863 struct netlink_ext_ack *extack = info->extack;
3864 unsigned int size, i, n, ulen = 0, usize = 0;
3865 u8 genmask = nft_genmask_next(info->net);
3866 struct nft_rule *rule, *old_rule = NULL;
3867 struct nft_expr_info *expr_info = NULL;
3868 u8 family = info->nfmsg->nfgen_family;
3869 struct nft_flow_rule *flow = NULL;
3870 struct net *net = info->net;
3871 struct nft_userdata *udata;
3872 struct nft_table *table;
3873 struct nft_chain *chain;
3874 struct nft_trans *trans;
3875 u64 handle, pos_handle;
3876 struct nft_expr *expr;
3877 struct nft_ctx ctx;
3878 struct nlattr *tmp;
3879 int err, rem;
3880
3881 lockdep_assert_held(&nft_net->commit_mutex);
3882
3883 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3884 NETLINK_CB(skb).portid);
3885 if (IS_ERR(table)) {
3886 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3887 return PTR_ERR(table);
3888 }
3889
3890 if (nla[NFTA_RULE_CHAIN]) {
3891 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3892 genmask);
3893 if (IS_ERR(chain)) {
3894 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3895 return PTR_ERR(chain);
3896 }
3897
3898 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3899 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3900 genmask);
3901 if (IS_ERR(chain)) {
3902 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3903 return PTR_ERR(chain);
3904 }
3905 } else {
3906 return -EINVAL;
3907 }
3908
3909 if (nft_chain_is_bound(chain))
3910 return -EOPNOTSUPP;
3911
3912 if (nla[NFTA_RULE_HANDLE]) {
3913 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3914 rule = __nft_rule_lookup(chain, handle);
3915 if (IS_ERR(rule)) {
3916 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3917 return PTR_ERR(rule);
3918 }
3919
3920 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3921 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3922 return -EEXIST;
3923 }
3924 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3925 old_rule = rule;
3926 else
3927 return -EOPNOTSUPP;
3928 } else {
3929 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3930 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3931 return -EINVAL;
3932 handle = nf_tables_alloc_handle(table);
3933
3934 if (nla[NFTA_RULE_POSITION]) {
3935 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3936 old_rule = __nft_rule_lookup(chain, pos_handle);
3937 if (IS_ERR(old_rule)) {
3938 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3939 return PTR_ERR(old_rule);
3940 }
3941 } else if (nla[NFTA_RULE_POSITION_ID]) {
3942 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3943 if (IS_ERR(old_rule)) {
3944 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3945 return PTR_ERR(old_rule);
3946 }
3947 }
3948 }
3949
3950 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3951
3952 n = 0;
3953 size = 0;
3954 if (nla[NFTA_RULE_EXPRESSIONS]) {
3955 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3956 sizeof(struct nft_expr_info),
3957 GFP_KERNEL);
3958 if (!expr_info)
3959 return -ENOMEM;
3960
3961 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3962 err = -EINVAL;
3963 if (nla_type(tmp) != NFTA_LIST_ELEM)
3964 goto err_release_expr;
3965 if (n == NFT_RULE_MAXEXPRS)
3966 goto err_release_expr;
3967 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3968 if (err < 0) {
3969 NL_SET_BAD_ATTR(extack, tmp);
3970 goto err_release_expr;
3971 }
3972 size += expr_info[n].ops->size;
3973 n++;
3974 }
3975 }
3976 /* Check for overflow of dlen field */
3977 err = -EFBIG;
3978 if (size >= 1 << 12)
3979 goto err_release_expr;
3980
3981 if (nla[NFTA_RULE_USERDATA]) {
3982 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3983 if (ulen > 0)
3984 usize = sizeof(struct nft_userdata) + ulen;
3985 }
3986
3987 err = -ENOMEM;
3988 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3989 if (rule == NULL)
3990 goto err_release_expr;
3991
3992 nft_activate_next(net, rule);
3993
3994 rule->handle = handle;
3995 rule->dlen = size;
3996 rule->udata = ulen ? 1 : 0;
3997
3998 if (ulen) {
3999 udata = nft_userdata(rule);
4000 udata->len = ulen - 1;
4001 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4002 }
4003
4004 expr = nft_expr_first(rule);
4005 for (i = 0; i < n; i++) {
4006 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4007 if (err < 0) {
4008 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4009 goto err_release_rule;
4010 }
4011
4012 if (expr_info[i].ops->validate)
4013 nft_validate_state_update(table, NFT_VALIDATE_NEED);
4014
4015 expr_info[i].ops = NULL;
4016 expr = nft_expr_next(expr);
4017 }
4018
4019 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4020 flow = nft_flow_rule_create(net, rule);
4021 if (IS_ERR(flow)) {
4022 err = PTR_ERR(flow);
4023 goto err_release_rule;
4024 }
4025 }
4026
4027 if (!nft_use_inc(&chain->use)) {
4028 err = -EMFILE;
4029 goto err_release_rule;
4030 }
4031
4032 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4033 if (nft_chain_binding(chain)) {
4034 err = -EOPNOTSUPP;
4035 goto err_destroy_flow_rule;
4036 }
4037
4038 err = nft_delrule(&ctx, old_rule);
4039 if (err < 0)
4040 goto err_destroy_flow_rule;
4041
4042 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4043 if (trans == NULL) {
4044 err = -ENOMEM;
4045 goto err_destroy_flow_rule;
4046 }
4047 list_add_tail_rcu(&rule->list, &old_rule->list);
4048 } else {
4049 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4050 if (!trans) {
4051 err = -ENOMEM;
4052 goto err_destroy_flow_rule;
4053 }
4054
4055 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4056 if (old_rule)
4057 list_add_rcu(&rule->list, &old_rule->list);
4058 else
4059 list_add_tail_rcu(&rule->list, &chain->rules);
4060 } else {
4061 if (old_rule)
4062 list_add_tail_rcu(&rule->list, &old_rule->list);
4063 else
4064 list_add_rcu(&rule->list, &chain->rules);
4065 }
4066 }
4067 kvfree(expr_info);
4068
4069 if (flow)
4070 nft_trans_flow_rule(trans) = flow;
4071
4072 if (table->validate_state == NFT_VALIDATE_DO)
4073 return nft_table_validate(net, table);
4074
4075 return 0;
4076
4077 err_destroy_flow_rule:
4078 nft_use_dec_restore(&chain->use);
4079 if (flow)
4080 nft_flow_rule_destroy(flow);
4081 err_release_rule:
4082 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4083 nf_tables_rule_destroy(&ctx, rule);
4084 err_release_expr:
4085 for (i = 0; i < n; i++) {
4086 if (expr_info[i].ops) {
4087 module_put(expr_info[i].ops->type->owner);
4088 if (expr_info[i].ops->type->release_ops)
4089 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4090 }
4091 }
4092 kvfree(expr_info);
4093
4094 return err;
4095 }
4096
nft_rule_lookup_byid(const struct net * net,const struct nft_chain * chain,const struct nlattr * nla)4097 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4098 const struct nft_chain *chain,
4099 const struct nlattr *nla)
4100 {
4101 struct nftables_pernet *nft_net = nft_pernet(net);
4102 u32 id = ntohl(nla_get_be32(nla));
4103 struct nft_trans *trans;
4104
4105 list_for_each_entry(trans, &nft_net->commit_list, list) {
4106 if (trans->msg_type == NFT_MSG_NEWRULE &&
4107 trans->ctx.chain == chain &&
4108 id == nft_trans_rule_id(trans))
4109 return nft_trans_rule(trans);
4110 }
4111 return ERR_PTR(-ENOENT);
4112 }
4113
nf_tables_delrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4114 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4115 const struct nlattr * const nla[])
4116 {
4117 struct netlink_ext_ack *extack = info->extack;
4118 u8 genmask = nft_genmask_next(info->net);
4119 u8 family = info->nfmsg->nfgen_family;
4120 struct nft_chain *chain = NULL;
4121 struct net *net = info->net;
4122 struct nft_table *table;
4123 struct nft_rule *rule;
4124 struct nft_ctx ctx;
4125 int err = 0;
4126
4127 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4128 NETLINK_CB(skb).portid);
4129 if (IS_ERR(table)) {
4130 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4131 return PTR_ERR(table);
4132 }
4133
4134 if (nla[NFTA_RULE_CHAIN]) {
4135 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4136 genmask);
4137 if (IS_ERR(chain)) {
4138 if (PTR_ERR(chain) == -ENOENT &&
4139 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4140 return 0;
4141
4142 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4143 return PTR_ERR(chain);
4144 }
4145 if (nft_chain_binding(chain))
4146 return -EOPNOTSUPP;
4147 }
4148
4149 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4150
4151 if (chain) {
4152 if (nla[NFTA_RULE_HANDLE]) {
4153 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4154 if (IS_ERR(rule)) {
4155 if (PTR_ERR(rule) == -ENOENT &&
4156 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4157 return 0;
4158
4159 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4160 return PTR_ERR(rule);
4161 }
4162
4163 err = nft_delrule(&ctx, rule);
4164 } else if (nla[NFTA_RULE_ID]) {
4165 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4166 if (IS_ERR(rule)) {
4167 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4168 return PTR_ERR(rule);
4169 }
4170
4171 err = nft_delrule(&ctx, rule);
4172 } else {
4173 err = nft_delrule_by_chain(&ctx);
4174 }
4175 } else {
4176 list_for_each_entry(chain, &table->chains, list) {
4177 if (!nft_is_active_next(net, chain))
4178 continue;
4179 if (nft_chain_binding(chain))
4180 continue;
4181
4182 ctx.chain = chain;
4183 err = nft_delrule_by_chain(&ctx);
4184 if (err < 0)
4185 break;
4186 }
4187 }
4188
4189 return err;
4190 }
4191
4192 /*
4193 * Sets
4194 */
4195 static const struct nft_set_type *nft_set_types[] = {
4196 &nft_set_hash_fast_type,
4197 &nft_set_hash_type,
4198 &nft_set_rhash_type,
4199 &nft_set_bitmap_type,
4200 &nft_set_rbtree_type,
4201 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4202 &nft_set_pipapo_avx2_type,
4203 #endif
4204 &nft_set_pipapo_type,
4205 };
4206
4207 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4208 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4209 NFT_SET_EVAL)
4210
nft_set_ops_candidate(const struct nft_set_type * type,u32 flags)4211 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4212 {
4213 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4214 }
4215
4216 /*
4217 * Select a set implementation based on the data characteristics and the
4218 * given policy. The total memory use might not be known if no size is
4219 * given, in that case the amount of memory per element is used.
4220 */
4221 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)4222 nft_select_set_ops(const struct nft_ctx *ctx,
4223 const struct nlattr * const nla[],
4224 const struct nft_set_desc *desc)
4225 {
4226 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4227 const struct nft_set_ops *ops, *bops;
4228 struct nft_set_estimate est, best;
4229 const struct nft_set_type *type;
4230 u32 flags = 0;
4231 int i;
4232
4233 lockdep_assert_held(&nft_net->commit_mutex);
4234 lockdep_nfnl_nft_mutex_not_held();
4235
4236 if (nla[NFTA_SET_FLAGS] != NULL)
4237 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4238
4239 bops = NULL;
4240 best.size = ~0;
4241 best.lookup = ~0;
4242 best.space = ~0;
4243
4244 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4245 type = nft_set_types[i];
4246 ops = &type->ops;
4247
4248 if (!nft_set_ops_candidate(type, flags))
4249 continue;
4250 if (!ops->estimate(desc, flags, &est))
4251 continue;
4252
4253 switch (desc->policy) {
4254 case NFT_SET_POL_PERFORMANCE:
4255 if (est.lookup < best.lookup)
4256 break;
4257 if (est.lookup == best.lookup &&
4258 est.space < best.space)
4259 break;
4260 continue;
4261 case NFT_SET_POL_MEMORY:
4262 if (!desc->size) {
4263 if (est.space < best.space)
4264 break;
4265 if (est.space == best.space &&
4266 est.lookup < best.lookup)
4267 break;
4268 } else if (est.size < best.size || !bops) {
4269 break;
4270 }
4271 continue;
4272 default:
4273 break;
4274 }
4275
4276 bops = ops;
4277 best = est;
4278 }
4279
4280 if (bops != NULL)
4281 return bops;
4282
4283 return ERR_PTR(-EOPNOTSUPP);
4284 }
4285
4286 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4287 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4288 .len = NFT_TABLE_MAXNAMELEN - 1 },
4289 [NFTA_SET_NAME] = { .type = NLA_STRING,
4290 .len = NFT_SET_MAXNAMELEN - 1 },
4291 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4292 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4293 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4294 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4295 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4296 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4297 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4298 [NFTA_SET_ID] = { .type = NLA_U32 },
4299 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4300 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4301 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4302 .len = NFT_USERDATA_MAXLEN },
4303 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4304 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4305 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4306 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4307 };
4308
4309 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4310 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4311 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4312 };
4313
nft_set_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4314 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4315 const struct nlattr *nla, u8 genmask)
4316 {
4317 struct nft_set *set;
4318
4319 if (nla == NULL)
4320 return ERR_PTR(-EINVAL);
4321
4322 list_for_each_entry_rcu(set, &table->sets, list) {
4323 if (!nla_strcmp(nla, set->name) &&
4324 nft_active_genmask(set, genmask))
4325 return set;
4326 }
4327 return ERR_PTR(-ENOENT);
4328 }
4329
nft_set_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4330 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4331 const struct nlattr *nla,
4332 u8 genmask)
4333 {
4334 struct nft_set *set;
4335
4336 list_for_each_entry(set, &table->sets, list) {
4337 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4338 nft_active_genmask(set, genmask))
4339 return set;
4340 }
4341 return ERR_PTR(-ENOENT);
4342 }
4343
nft_set_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)4344 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4345 const struct nft_table *table,
4346 const struct nlattr *nla, u8 genmask)
4347 {
4348 struct nftables_pernet *nft_net = nft_pernet(net);
4349 u32 id = ntohl(nla_get_be32(nla));
4350 struct nft_trans *trans;
4351
4352 list_for_each_entry(trans, &nft_net->commit_list, list) {
4353 if (trans->msg_type == NFT_MSG_NEWSET) {
4354 struct nft_set *set = nft_trans_set(trans);
4355
4356 if (id == nft_trans_set_id(trans) &&
4357 set->table == table &&
4358 nft_active_genmask(set, genmask))
4359 return set;
4360 }
4361 }
4362 return ERR_PTR(-ENOENT);
4363 }
4364
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)4365 struct nft_set *nft_set_lookup_global(const struct net *net,
4366 const struct nft_table *table,
4367 const struct nlattr *nla_set_name,
4368 const struct nlattr *nla_set_id,
4369 u8 genmask)
4370 {
4371 struct nft_set *set;
4372
4373 set = nft_set_lookup(table, nla_set_name, genmask);
4374 if (IS_ERR(set)) {
4375 if (!nla_set_id)
4376 return set;
4377
4378 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4379 }
4380 return set;
4381 }
4382 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4383
nf_tables_set_alloc_name(struct nft_ctx * ctx,struct nft_set * set,const char * name)4384 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4385 const char *name)
4386 {
4387 const struct nft_set *i;
4388 const char *p;
4389 unsigned long *inuse;
4390 unsigned int n = 0, min = 0;
4391
4392 p = strchr(name, '%');
4393 if (p != NULL) {
4394 if (p[1] != 'd' || strchr(p + 2, '%'))
4395 return -EINVAL;
4396
4397 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4398 return -EINVAL;
4399
4400 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4401 if (inuse == NULL)
4402 return -ENOMEM;
4403 cont:
4404 list_for_each_entry(i, &ctx->table->sets, list) {
4405 int tmp;
4406
4407 if (!nft_is_active_next(ctx->net, i))
4408 continue;
4409 if (!sscanf(i->name, name, &tmp))
4410 continue;
4411 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4412 continue;
4413
4414 set_bit(tmp - min, inuse);
4415 }
4416
4417 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4418 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4419 min += BITS_PER_BYTE * PAGE_SIZE;
4420 memset(inuse, 0, PAGE_SIZE);
4421 goto cont;
4422 }
4423 free_page((unsigned long)inuse);
4424 }
4425
4426 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4427 if (!set->name)
4428 return -ENOMEM;
4429
4430 list_for_each_entry(i, &ctx->table->sets, list) {
4431 if (!nft_is_active_next(ctx->net, i))
4432 continue;
4433 if (!strcmp(set->name, i->name)) {
4434 kfree(set->name);
4435 set->name = NULL;
4436 return -ENFILE;
4437 }
4438 }
4439 return 0;
4440 }
4441
nf_msecs_to_jiffies64(const struct nlattr * nla,u64 * result)4442 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4443 {
4444 u64 ms = be64_to_cpu(nla_get_be64(nla));
4445 u64 max = (u64)(~((u64)0));
4446
4447 max = div_u64(max, NSEC_PER_MSEC);
4448 if (ms >= max)
4449 return -ERANGE;
4450
4451 ms *= NSEC_PER_MSEC;
4452 *result = nsecs_to_jiffies64(ms);
4453 return 0;
4454 }
4455
nf_jiffies64_to_msecs(u64 input)4456 __be64 nf_jiffies64_to_msecs(u64 input)
4457 {
4458 return cpu_to_be64(jiffies64_to_msecs(input));
4459 }
4460
nf_tables_fill_set_concat(struct sk_buff * skb,const struct nft_set * set)4461 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4462 const struct nft_set *set)
4463 {
4464 struct nlattr *concat, *field;
4465 int i;
4466
4467 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4468 if (!concat)
4469 return -ENOMEM;
4470
4471 for (i = 0; i < set->field_count; i++) {
4472 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4473 if (!field)
4474 return -ENOMEM;
4475
4476 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4477 htonl(set->field_len[i])))
4478 return -ENOMEM;
4479
4480 nla_nest_end(skb, field);
4481 }
4482
4483 nla_nest_end(skb, concat);
4484
4485 return 0;
4486 }
4487
nf_tables_fill_set(struct sk_buff * skb,const struct nft_ctx * ctx,const struct nft_set * set,u16 event,u16 flags)4488 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4489 const struct nft_set *set, u16 event, u16 flags)
4490 {
4491 u64 timeout = READ_ONCE(set->timeout);
4492 u32 gc_int = READ_ONCE(set->gc_int);
4493 u32 portid = ctx->portid;
4494 struct nlmsghdr *nlh;
4495 struct nlattr *nest;
4496 u32 seq = ctx->seq;
4497 int i;
4498
4499 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4500 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4501 NFNETLINK_V0, nft_base_seq(ctx->net));
4502 if (!nlh)
4503 goto nla_put_failure;
4504
4505 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4506 goto nla_put_failure;
4507 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4508 goto nla_put_failure;
4509 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4510 NFTA_SET_PAD))
4511 goto nla_put_failure;
4512
4513 if (event == NFT_MSG_DELSET) {
4514 nlmsg_end(skb, nlh);
4515 return 0;
4516 }
4517
4518 if (set->flags != 0)
4519 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4520 goto nla_put_failure;
4521
4522 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4523 goto nla_put_failure;
4524 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4525 goto nla_put_failure;
4526 if (set->flags & NFT_SET_MAP) {
4527 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4528 goto nla_put_failure;
4529 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4530 goto nla_put_failure;
4531 }
4532 if (set->flags & NFT_SET_OBJECT &&
4533 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4534 goto nla_put_failure;
4535
4536 if (timeout &&
4537 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4538 nf_jiffies64_to_msecs(timeout),
4539 NFTA_SET_PAD))
4540 goto nla_put_failure;
4541 if (gc_int &&
4542 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4543 goto nla_put_failure;
4544
4545 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4546 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4547 goto nla_put_failure;
4548 }
4549
4550 if (set->udata &&
4551 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4552 goto nla_put_failure;
4553
4554 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4555 if (!nest)
4556 goto nla_put_failure;
4557 if (set->size &&
4558 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4559 goto nla_put_failure;
4560
4561 if (set->field_count > 1 &&
4562 nf_tables_fill_set_concat(skb, set))
4563 goto nla_put_failure;
4564
4565 nla_nest_end(skb, nest);
4566
4567 if (set->num_exprs == 1) {
4568 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4569 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4570 goto nla_put_failure;
4571
4572 nla_nest_end(skb, nest);
4573 } else if (set->num_exprs > 1) {
4574 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4575 if (nest == NULL)
4576 goto nla_put_failure;
4577
4578 for (i = 0; i < set->num_exprs; i++) {
4579 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4580 set->exprs[i], false) < 0)
4581 goto nla_put_failure;
4582 }
4583 nla_nest_end(skb, nest);
4584 }
4585
4586 nlmsg_end(skb, nlh);
4587 return 0;
4588
4589 nla_put_failure:
4590 nlmsg_trim(skb, nlh);
4591 return -1;
4592 }
4593
nf_tables_set_notify(const struct nft_ctx * ctx,const struct nft_set * set,int event,gfp_t gfp_flags)4594 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4595 const struct nft_set *set, int event,
4596 gfp_t gfp_flags)
4597 {
4598 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4599 u32 portid = ctx->portid;
4600 struct sk_buff *skb;
4601 u16 flags = 0;
4602 int err;
4603
4604 if (!ctx->report &&
4605 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4606 return;
4607
4608 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4609 if (skb == NULL)
4610 goto err;
4611
4612 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4613 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4614
4615 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4616 if (err < 0) {
4617 kfree_skb(skb);
4618 goto err;
4619 }
4620
4621 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4622 return;
4623 err:
4624 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4625 }
4626
nf_tables_dump_sets(struct sk_buff * skb,struct netlink_callback * cb)4627 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4628 {
4629 const struct nft_set *set;
4630 unsigned int idx, s_idx = cb->args[0];
4631 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4632 struct net *net = sock_net(skb->sk);
4633 struct nft_ctx *ctx = cb->data, ctx_set;
4634 struct nftables_pernet *nft_net;
4635
4636 if (cb->args[1])
4637 return skb->len;
4638
4639 rcu_read_lock();
4640 nft_net = nft_pernet(net);
4641 cb->seq = READ_ONCE(nft_net->base_seq);
4642
4643 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4644 if (ctx->family != NFPROTO_UNSPEC &&
4645 ctx->family != table->family)
4646 continue;
4647
4648 if (ctx->table && ctx->table != table)
4649 continue;
4650
4651 if (cur_table) {
4652 if (cur_table != table)
4653 continue;
4654
4655 cur_table = NULL;
4656 }
4657 idx = 0;
4658 list_for_each_entry_rcu(set, &table->sets, list) {
4659 if (idx < s_idx)
4660 goto cont;
4661 if (!nft_is_active(net, set))
4662 goto cont;
4663
4664 ctx_set = *ctx;
4665 ctx_set.table = table;
4666 ctx_set.family = table->family;
4667
4668 if (nf_tables_fill_set(skb, &ctx_set, set,
4669 NFT_MSG_NEWSET,
4670 NLM_F_MULTI) < 0) {
4671 cb->args[0] = idx;
4672 cb->args[2] = (unsigned long) table;
4673 goto done;
4674 }
4675 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4676 cont:
4677 idx++;
4678 }
4679 if (s_idx)
4680 s_idx = 0;
4681 }
4682 cb->args[1] = 1;
4683 done:
4684 rcu_read_unlock();
4685 return skb->len;
4686 }
4687
nf_tables_dump_sets_start(struct netlink_callback * cb)4688 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4689 {
4690 struct nft_ctx *ctx_dump = NULL;
4691
4692 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4693 if (ctx_dump == NULL)
4694 return -ENOMEM;
4695
4696 cb->data = ctx_dump;
4697 return 0;
4698 }
4699
nf_tables_dump_sets_done(struct netlink_callback * cb)4700 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4701 {
4702 kfree(cb->data);
4703 return 0;
4704 }
4705
4706 /* called with rcu_read_lock held */
nf_tables_getset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4707 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4708 const struct nlattr * const nla[])
4709 {
4710 struct netlink_ext_ack *extack = info->extack;
4711 u8 genmask = nft_genmask_cur(info->net);
4712 u8 family = info->nfmsg->nfgen_family;
4713 struct nft_table *table = NULL;
4714 struct net *net = info->net;
4715 const struct nft_set *set;
4716 struct sk_buff *skb2;
4717 struct nft_ctx ctx;
4718 int err;
4719
4720 if (nla[NFTA_SET_TABLE]) {
4721 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4722 genmask, 0);
4723 if (IS_ERR(table)) {
4724 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4725 return PTR_ERR(table);
4726 }
4727 }
4728
4729 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4730
4731 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4732 struct netlink_dump_control c = {
4733 .start = nf_tables_dump_sets_start,
4734 .dump = nf_tables_dump_sets,
4735 .done = nf_tables_dump_sets_done,
4736 .data = &ctx,
4737 .module = THIS_MODULE,
4738 };
4739
4740 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4741 }
4742
4743 /* Only accept unspec with dump */
4744 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4745 return -EAFNOSUPPORT;
4746 if (!nla[NFTA_SET_TABLE])
4747 return -EINVAL;
4748
4749 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4750 if (IS_ERR(set))
4751 return PTR_ERR(set);
4752
4753 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4754 if (skb2 == NULL)
4755 return -ENOMEM;
4756
4757 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4758 if (err < 0)
4759 goto err_fill_set_info;
4760
4761 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4762
4763 err_fill_set_info:
4764 kfree_skb(skb2);
4765 return err;
4766 }
4767
4768 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4769 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4770 };
4771
nft_set_desc_concat_parse(const struct nlattr * attr,struct nft_set_desc * desc)4772 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4773 struct nft_set_desc *desc)
4774 {
4775 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4776 u32 len;
4777 int err;
4778
4779 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4780 return -E2BIG;
4781
4782 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4783 nft_concat_policy, NULL);
4784 if (err < 0)
4785 return err;
4786
4787 if (!tb[NFTA_SET_FIELD_LEN])
4788 return -EINVAL;
4789
4790 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4791 if (!len || len > U8_MAX)
4792 return -EINVAL;
4793
4794 desc->field_len[desc->field_count++] = len;
4795
4796 return 0;
4797 }
4798
nft_set_desc_concat(struct nft_set_desc * desc,const struct nlattr * nla)4799 static int nft_set_desc_concat(struct nft_set_desc *desc,
4800 const struct nlattr *nla)
4801 {
4802 u32 num_regs = 0, key_num_regs = 0;
4803 struct nlattr *attr;
4804 int rem, err, i;
4805
4806 nla_for_each_nested(attr, nla, rem) {
4807 if (nla_type(attr) != NFTA_LIST_ELEM)
4808 return -EINVAL;
4809
4810 err = nft_set_desc_concat_parse(attr, desc);
4811 if (err < 0)
4812 return err;
4813 }
4814
4815 for (i = 0; i < desc->field_count; i++)
4816 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4817
4818 key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4819 if (key_num_regs != num_regs)
4820 return -EINVAL;
4821
4822 if (num_regs > NFT_REG32_COUNT)
4823 return -E2BIG;
4824
4825 return 0;
4826 }
4827
nf_tables_set_desc_parse(struct nft_set_desc * desc,const struct nlattr * nla)4828 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4829 const struct nlattr *nla)
4830 {
4831 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4832 int err;
4833
4834 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4835 nft_set_desc_policy, NULL);
4836 if (err < 0)
4837 return err;
4838
4839 if (da[NFTA_SET_DESC_SIZE] != NULL)
4840 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4841 if (da[NFTA_SET_DESC_CONCAT])
4842 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4843
4844 return err;
4845 }
4846
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)4847 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4848 const struct nlattr * const *nla,
4849 struct nft_expr **exprs, int *num_exprs,
4850 u32 flags)
4851 {
4852 struct nft_expr *expr;
4853 int err, i;
4854
4855 if (nla[NFTA_SET_EXPR]) {
4856 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4857 if (IS_ERR(expr)) {
4858 err = PTR_ERR(expr);
4859 goto err_set_expr_alloc;
4860 }
4861 exprs[0] = expr;
4862 (*num_exprs)++;
4863 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4864 struct nlattr *tmp;
4865 int left;
4866
4867 if (!(flags & NFT_SET_EXPR)) {
4868 err = -EINVAL;
4869 goto err_set_expr_alloc;
4870 }
4871 i = 0;
4872 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4873 if (i == NFT_SET_EXPR_MAX) {
4874 err = -E2BIG;
4875 goto err_set_expr_alloc;
4876 }
4877 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4878 err = -EINVAL;
4879 goto err_set_expr_alloc;
4880 }
4881 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4882 if (IS_ERR(expr)) {
4883 err = PTR_ERR(expr);
4884 goto err_set_expr_alloc;
4885 }
4886 exprs[i++] = expr;
4887 (*num_exprs)++;
4888 }
4889 }
4890
4891 return 0;
4892
4893 err_set_expr_alloc:
4894 for (i = 0; i < *num_exprs; i++)
4895 nft_expr_destroy(ctx, exprs[i]);
4896
4897 return err;
4898 }
4899
nft_set_is_same(const struct nft_set * set,const struct nft_set_desc * desc,struct nft_expr * exprs[],u32 num_exprs,u32 flags)4900 static bool nft_set_is_same(const struct nft_set *set,
4901 const struct nft_set_desc *desc,
4902 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4903 {
4904 int i;
4905
4906 if (set->ktype != desc->ktype ||
4907 set->dtype != desc->dtype ||
4908 set->flags != flags ||
4909 set->klen != desc->klen ||
4910 set->dlen != desc->dlen ||
4911 set->field_count != desc->field_count ||
4912 set->num_exprs != num_exprs)
4913 return false;
4914
4915 for (i = 0; i < desc->field_count; i++) {
4916 if (set->field_len[i] != desc->field_len[i])
4917 return false;
4918 }
4919
4920 for (i = 0; i < num_exprs; i++) {
4921 if (set->exprs[i]->ops != exprs[i]->ops)
4922 return false;
4923 }
4924
4925 return true;
4926 }
4927
nf_tables_newset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4928 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4929 const struct nlattr * const nla[])
4930 {
4931 struct netlink_ext_ack *extack = info->extack;
4932 u8 genmask = nft_genmask_next(info->net);
4933 u8 family = info->nfmsg->nfgen_family;
4934 const struct nft_set_ops *ops;
4935 struct net *net = info->net;
4936 struct nft_set_desc desc;
4937 struct nft_table *table;
4938 unsigned char *udata;
4939 struct nft_set *set;
4940 struct nft_ctx ctx;
4941 size_t alloc_size;
4942 int num_exprs = 0;
4943 char *name;
4944 int err, i;
4945 u16 udlen;
4946 u32 flags;
4947 u64 size;
4948
4949 if (nla[NFTA_SET_TABLE] == NULL ||
4950 nla[NFTA_SET_NAME] == NULL ||
4951 nla[NFTA_SET_KEY_LEN] == NULL ||
4952 nla[NFTA_SET_ID] == NULL)
4953 return -EINVAL;
4954
4955 memset(&desc, 0, sizeof(desc));
4956
4957 desc.ktype = NFT_DATA_VALUE;
4958 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4959 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4960 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4961 return -EINVAL;
4962 }
4963
4964 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4965 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4966 return -EINVAL;
4967
4968 flags = 0;
4969 if (nla[NFTA_SET_FLAGS] != NULL) {
4970 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4971 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4972 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4973 NFT_SET_MAP | NFT_SET_EVAL |
4974 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4975 return -EOPNOTSUPP;
4976 /* Only one of these operations is supported */
4977 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4978 (NFT_SET_MAP | NFT_SET_OBJECT))
4979 return -EOPNOTSUPP;
4980 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4981 (NFT_SET_EVAL | NFT_SET_OBJECT))
4982 return -EOPNOTSUPP;
4983 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
4984 (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
4985 return -EOPNOTSUPP;
4986 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
4987 (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
4988 return -EOPNOTSUPP;
4989 }
4990
4991 desc.dtype = 0;
4992 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4993 if (!(flags & NFT_SET_MAP))
4994 return -EINVAL;
4995
4996 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4997 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4998 desc.dtype != NFT_DATA_VERDICT)
4999 return -EINVAL;
5000
5001 if (desc.dtype != NFT_DATA_VERDICT) {
5002 if (nla[NFTA_SET_DATA_LEN] == NULL)
5003 return -EINVAL;
5004 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5005 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5006 return -EINVAL;
5007 } else
5008 desc.dlen = sizeof(struct nft_verdict);
5009 } else if (flags & NFT_SET_MAP)
5010 return -EINVAL;
5011
5012 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5013 if (!(flags & NFT_SET_OBJECT))
5014 return -EINVAL;
5015
5016 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5017 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5018 desc.objtype > NFT_OBJECT_MAX)
5019 return -EOPNOTSUPP;
5020 } else if (flags & NFT_SET_OBJECT)
5021 return -EINVAL;
5022 else
5023 desc.objtype = NFT_OBJECT_UNSPEC;
5024
5025 desc.timeout = 0;
5026 if (nla[NFTA_SET_TIMEOUT] != NULL) {
5027 if (!(flags & NFT_SET_TIMEOUT))
5028 return -EINVAL;
5029
5030 if (flags & NFT_SET_ANONYMOUS)
5031 return -EOPNOTSUPP;
5032
5033 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5034 if (err)
5035 return err;
5036 }
5037 desc.gc_int = 0;
5038 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5039 if (!(flags & NFT_SET_TIMEOUT))
5040 return -EINVAL;
5041
5042 if (flags & NFT_SET_ANONYMOUS)
5043 return -EOPNOTSUPP;
5044
5045 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5046 }
5047
5048 desc.policy = NFT_SET_POL_PERFORMANCE;
5049 if (nla[NFTA_SET_POLICY] != NULL) {
5050 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5051 switch (desc.policy) {
5052 case NFT_SET_POL_PERFORMANCE:
5053 case NFT_SET_POL_MEMORY:
5054 break;
5055 default:
5056 return -EOPNOTSUPP;
5057 }
5058 }
5059
5060 if (nla[NFTA_SET_DESC] != NULL) {
5061 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5062 if (err < 0)
5063 return err;
5064
5065 if (desc.field_count > 1) {
5066 if (!(flags & NFT_SET_CONCAT))
5067 return -EINVAL;
5068 } else if (flags & NFT_SET_CONCAT) {
5069 return -EINVAL;
5070 }
5071 } else if (flags & NFT_SET_CONCAT) {
5072 return -EINVAL;
5073 }
5074
5075 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5076 desc.expr = true;
5077
5078 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5079 NETLINK_CB(skb).portid);
5080 if (IS_ERR(table)) {
5081 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5082 return PTR_ERR(table);
5083 }
5084
5085 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5086
5087 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5088 if (IS_ERR(set)) {
5089 if (PTR_ERR(set) != -ENOENT) {
5090 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5091 return PTR_ERR(set);
5092 }
5093 } else {
5094 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5095
5096 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5097 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5098 return -EEXIST;
5099 }
5100 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5101 return -EOPNOTSUPP;
5102
5103 if (nft_set_is_anonymous(set))
5104 return -EOPNOTSUPP;
5105
5106 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5107 if (err < 0)
5108 return err;
5109
5110 err = 0;
5111 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5112 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5113 err = -EEXIST;
5114 }
5115
5116 for (i = 0; i < num_exprs; i++)
5117 nft_expr_destroy(&ctx, exprs[i]);
5118
5119 if (err < 0)
5120 return err;
5121
5122 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5123 }
5124
5125 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5126 return -ENOENT;
5127
5128 ops = nft_select_set_ops(&ctx, nla, &desc);
5129 if (IS_ERR(ops))
5130 return PTR_ERR(ops);
5131
5132 udlen = 0;
5133 if (nla[NFTA_SET_USERDATA])
5134 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5135
5136 size = 0;
5137 if (ops->privsize != NULL)
5138 size = ops->privsize(nla, &desc);
5139 alloc_size = sizeof(*set) + size + udlen;
5140 if (alloc_size < size || alloc_size > INT_MAX)
5141 return -ENOMEM;
5142
5143 if (!nft_use_inc(&table->use))
5144 return -EMFILE;
5145
5146 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5147 if (!set) {
5148 err = -ENOMEM;
5149 goto err_alloc;
5150 }
5151
5152 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5153 if (!name) {
5154 err = -ENOMEM;
5155 goto err_set_name;
5156 }
5157
5158 err = nf_tables_set_alloc_name(&ctx, set, name);
5159 kfree(name);
5160 if (err < 0)
5161 goto err_set_name;
5162
5163 udata = NULL;
5164 if (udlen) {
5165 udata = set->data + size;
5166 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5167 }
5168
5169 INIT_LIST_HEAD(&set->bindings);
5170 INIT_LIST_HEAD(&set->catchall_list);
5171 refcount_set(&set->refs, 1);
5172 set->table = table;
5173 write_pnet(&set->net, net);
5174 set->ops = ops;
5175 set->ktype = desc.ktype;
5176 set->klen = desc.klen;
5177 set->dtype = desc.dtype;
5178 set->objtype = desc.objtype;
5179 set->dlen = desc.dlen;
5180 set->flags = flags;
5181 set->size = desc.size;
5182 set->policy = desc.policy;
5183 set->udlen = udlen;
5184 set->udata = udata;
5185 set->timeout = desc.timeout;
5186 set->gc_int = desc.gc_int;
5187
5188 set->field_count = desc.field_count;
5189 for (i = 0; i < desc.field_count; i++)
5190 set->field_len[i] = desc.field_len[i];
5191
5192 err = ops->init(set, &desc, nla);
5193 if (err < 0)
5194 goto err_set_init;
5195
5196 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5197 if (err < 0)
5198 goto err_set_destroy;
5199
5200 set->num_exprs = num_exprs;
5201 set->handle = nf_tables_alloc_handle(table);
5202 INIT_LIST_HEAD(&set->pending_update);
5203
5204 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5205 if (err < 0)
5206 goto err_set_expr_alloc;
5207
5208 list_add_tail_rcu(&set->list, &table->sets);
5209
5210 return 0;
5211
5212 err_set_expr_alloc:
5213 for (i = 0; i < set->num_exprs; i++)
5214 nft_expr_destroy(&ctx, set->exprs[i]);
5215 err_set_destroy:
5216 ops->destroy(&ctx, set);
5217 err_set_init:
5218 kfree(set->name);
5219 err_set_name:
5220 kvfree(set);
5221 err_alloc:
5222 nft_use_dec_restore(&table->use);
5223
5224 return err;
5225 }
5226
nft_set_catchall_destroy(const struct nft_ctx * ctx,struct nft_set * set)5227 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5228 struct nft_set *set)
5229 {
5230 struct nft_set_elem_catchall *next, *catchall;
5231
5232 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5233 list_del_rcu(&catchall->list);
5234 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5235 kfree_rcu(catchall, rcu);
5236 }
5237 }
5238
nft_set_put(struct nft_set * set)5239 static void nft_set_put(struct nft_set *set)
5240 {
5241 if (refcount_dec_and_test(&set->refs)) {
5242 kfree(set->name);
5243 kvfree(set);
5244 }
5245 }
5246
nft_set_destroy(const struct nft_ctx * ctx,struct nft_set * set)5247 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5248 {
5249 int i;
5250
5251 if (WARN_ON(set->use > 0))
5252 return;
5253
5254 for (i = 0; i < set->num_exprs; i++)
5255 nft_expr_destroy(ctx, set->exprs[i]);
5256
5257 set->ops->destroy(ctx, set);
5258 nft_set_catchall_destroy(ctx, set);
5259 nft_set_put(set);
5260 }
5261
nf_tables_delset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])5262 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5263 const struct nlattr * const nla[])
5264 {
5265 struct netlink_ext_ack *extack = info->extack;
5266 u8 genmask = nft_genmask_next(info->net);
5267 u8 family = info->nfmsg->nfgen_family;
5268 struct net *net = info->net;
5269 const struct nlattr *attr;
5270 struct nft_table *table;
5271 struct nft_set *set;
5272 struct nft_ctx ctx;
5273
5274 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5275 return -EAFNOSUPPORT;
5276
5277 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5278 genmask, NETLINK_CB(skb).portid);
5279 if (IS_ERR(table)) {
5280 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5281 return PTR_ERR(table);
5282 }
5283
5284 if (nla[NFTA_SET_HANDLE]) {
5285 attr = nla[NFTA_SET_HANDLE];
5286 set = nft_set_lookup_byhandle(table, attr, genmask);
5287 } else {
5288 attr = nla[NFTA_SET_NAME];
5289 set = nft_set_lookup(table, attr, genmask);
5290 }
5291
5292 if (IS_ERR(set)) {
5293 if (PTR_ERR(set) == -ENOENT &&
5294 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5295 return 0;
5296
5297 NL_SET_BAD_ATTR(extack, attr);
5298 return PTR_ERR(set);
5299 }
5300 if (set->use ||
5301 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5302 atomic_read(&set->nelems) > 0)) {
5303 NL_SET_BAD_ATTR(extack, attr);
5304 return -EBUSY;
5305 }
5306
5307 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5308
5309 return nft_delset(&ctx, set);
5310 }
5311
5312 static int nft_validate_register_store(const struct nft_ctx *ctx,
5313 enum nft_registers reg,
5314 const struct nft_data *data,
5315 enum nft_data_types type,
5316 unsigned int len);
5317
nft_setelem_data_validate(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)5318 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5319 struct nft_set *set,
5320 struct nft_set_elem *elem)
5321 {
5322 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5323 enum nft_registers dreg;
5324
5325 dreg = nft_type_to_reg(set->dtype);
5326 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5327 set->dtype == NFT_DATA_VERDICT ?
5328 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5329 set->dlen);
5330 }
5331
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)5332 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5333 struct nft_set *set,
5334 const struct nft_set_iter *iter,
5335 struct nft_set_elem *elem)
5336 {
5337 return nft_setelem_data_validate(ctx, set, elem);
5338 }
5339
nft_set_catchall_bind_check(const struct nft_ctx * ctx,struct nft_set * set)5340 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5341 struct nft_set *set)
5342 {
5343 u8 genmask = nft_genmask_next(ctx->net);
5344 struct nft_set_elem_catchall *catchall;
5345 struct nft_set_elem elem;
5346 struct nft_set_ext *ext;
5347 int ret = 0;
5348
5349 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5350 ext = nft_set_elem_ext(set, catchall->elem);
5351 if (!nft_set_elem_active(ext, genmask))
5352 continue;
5353
5354 elem.priv = catchall->elem;
5355 ret = nft_setelem_data_validate(ctx, set, &elem);
5356 if (ret < 0)
5357 break;
5358 }
5359
5360 return ret;
5361 }
5362
nf_tables_bind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding)5363 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5364 struct nft_set_binding *binding)
5365 {
5366 struct nft_set_binding *i;
5367 struct nft_set_iter iter;
5368
5369 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5370 return -EBUSY;
5371
5372 if (binding->flags & NFT_SET_MAP) {
5373 /* If the set is already bound to the same chain all
5374 * jumps are already validated for that chain.
5375 */
5376 list_for_each_entry(i, &set->bindings, list) {
5377 if (i->flags & NFT_SET_MAP &&
5378 i->chain == binding->chain)
5379 goto bind;
5380 }
5381
5382 iter.genmask = nft_genmask_next(ctx->net);
5383 iter.skip = 0;
5384 iter.count = 0;
5385 iter.err = 0;
5386 iter.fn = nf_tables_bind_check_setelem;
5387
5388 set->ops->walk(ctx, set, &iter);
5389 if (!iter.err)
5390 iter.err = nft_set_catchall_bind_check(ctx, set);
5391
5392 if (iter.err < 0)
5393 return iter.err;
5394 }
5395 bind:
5396 if (!nft_use_inc(&set->use))
5397 return -EMFILE;
5398
5399 binding->chain = ctx->chain;
5400 list_add_tail_rcu(&binding->list, &set->bindings);
5401 nft_set_trans_bind(ctx, set);
5402
5403 return 0;
5404 }
5405 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5406
nf_tables_unbind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,bool event)5407 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5408 struct nft_set_binding *binding, bool event)
5409 {
5410 list_del_rcu(&binding->list);
5411
5412 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5413 list_del_rcu(&set->list);
5414 set->dead = 1;
5415 if (event)
5416 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5417 GFP_KERNEL);
5418 }
5419 }
5420
5421 static void nft_setelem_data_activate(const struct net *net,
5422 const struct nft_set *set,
5423 struct nft_set_elem *elem);
5424
nft_mapelem_activate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5425 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5426 struct nft_set *set,
5427 const struct nft_set_iter *iter,
5428 struct nft_set_elem *elem)
5429 {
5430 nft_setelem_data_activate(ctx->net, set, elem);
5431
5432 return 0;
5433 }
5434
nft_map_catchall_activate(const struct nft_ctx * ctx,struct nft_set * set)5435 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5436 struct nft_set *set)
5437 {
5438 u8 genmask = nft_genmask_next(ctx->net);
5439 struct nft_set_elem_catchall *catchall;
5440 struct nft_set_elem elem;
5441 struct nft_set_ext *ext;
5442
5443 list_for_each_entry(catchall, &set->catchall_list, list) {
5444 ext = nft_set_elem_ext(set, catchall->elem);
5445 if (!nft_set_elem_active(ext, genmask))
5446 continue;
5447
5448 elem.priv = catchall->elem;
5449 nft_setelem_data_activate(ctx->net, set, &elem);
5450 break;
5451 }
5452 }
5453
nft_map_activate(const struct nft_ctx * ctx,struct nft_set * set)5454 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5455 {
5456 struct nft_set_iter iter = {
5457 .genmask = nft_genmask_next(ctx->net),
5458 .fn = nft_mapelem_activate,
5459 };
5460
5461 set->ops->walk(ctx, set, &iter);
5462 WARN_ON_ONCE(iter.err);
5463
5464 nft_map_catchall_activate(ctx, set);
5465 }
5466
nf_tables_activate_set(const struct nft_ctx * ctx,struct nft_set * set)5467 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5468 {
5469 if (nft_set_is_anonymous(set)) {
5470 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5471 nft_map_activate(ctx, set);
5472
5473 nft_clear(ctx->net, set);
5474 }
5475
5476 nft_use_inc_restore(&set->use);
5477 }
5478 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5479
nf_tables_deactivate_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,enum nft_trans_phase phase)5480 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5481 struct nft_set_binding *binding,
5482 enum nft_trans_phase phase)
5483 {
5484 switch (phase) {
5485 case NFT_TRANS_PREPARE_ERROR:
5486 nft_set_trans_unbind(ctx, set);
5487 if (nft_set_is_anonymous(set))
5488 nft_deactivate_next(ctx->net, set);
5489 else
5490 list_del_rcu(&binding->list);
5491
5492 nft_use_dec(&set->use);
5493 break;
5494 case NFT_TRANS_PREPARE:
5495 if (nft_set_is_anonymous(set)) {
5496 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5497 nft_map_deactivate(ctx, set);
5498
5499 nft_deactivate_next(ctx->net, set);
5500 }
5501 nft_use_dec(&set->use);
5502 return;
5503 case NFT_TRANS_ABORT:
5504 case NFT_TRANS_RELEASE:
5505 if (nft_set_is_anonymous(set) &&
5506 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5507 nft_map_deactivate(ctx, set);
5508
5509 nft_use_dec(&set->use);
5510 fallthrough;
5511 default:
5512 nf_tables_unbind_set(ctx, set, binding,
5513 phase == NFT_TRANS_COMMIT);
5514 }
5515 }
5516 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5517
nf_tables_destroy_set(const struct nft_ctx * ctx,struct nft_set * set)5518 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5519 {
5520 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5521 nft_set_destroy(ctx, set);
5522 }
5523 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5524
5525 const struct nft_set_ext_type nft_set_ext_types[] = {
5526 [NFT_SET_EXT_KEY] = {
5527 .align = __alignof__(u32),
5528 },
5529 [NFT_SET_EXT_DATA] = {
5530 .align = __alignof__(u32),
5531 },
5532 [NFT_SET_EXT_EXPRESSIONS] = {
5533 .align = __alignof__(struct nft_set_elem_expr),
5534 },
5535 [NFT_SET_EXT_OBJREF] = {
5536 .len = sizeof(struct nft_object *),
5537 .align = __alignof__(struct nft_object *),
5538 },
5539 [NFT_SET_EXT_FLAGS] = {
5540 .len = sizeof(u8),
5541 .align = __alignof__(u8),
5542 },
5543 [NFT_SET_EXT_TIMEOUT] = {
5544 .len = sizeof(u64),
5545 .align = __alignof__(u64),
5546 },
5547 [NFT_SET_EXT_EXPIRATION] = {
5548 .len = sizeof(u64),
5549 .align = __alignof__(u64),
5550 },
5551 [NFT_SET_EXT_USERDATA] = {
5552 .len = sizeof(struct nft_userdata),
5553 .align = __alignof__(struct nft_userdata),
5554 },
5555 [NFT_SET_EXT_KEY_END] = {
5556 .align = __alignof__(u32),
5557 },
5558 };
5559
5560 /*
5561 * Set elements
5562 */
5563
5564 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5565 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5566 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5567 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5568 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5569 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5570 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5571 .len = NFT_USERDATA_MAXLEN },
5572 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5573 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5574 .len = NFT_OBJ_MAXNAMELEN - 1 },
5575 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5576 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5577 };
5578
5579 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5580 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5581 .len = NFT_TABLE_MAXNAMELEN - 1 },
5582 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5583 .len = NFT_SET_MAXNAMELEN - 1 },
5584 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5585 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5586 };
5587
nft_set_elem_expr_dump(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_ext * ext,bool reset)5588 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5589 const struct nft_set *set,
5590 const struct nft_set_ext *ext,
5591 bool reset)
5592 {
5593 struct nft_set_elem_expr *elem_expr;
5594 u32 size, num_exprs = 0;
5595 struct nft_expr *expr;
5596 struct nlattr *nest;
5597
5598 elem_expr = nft_set_ext_expr(ext);
5599 nft_setelem_expr_foreach(expr, elem_expr, size)
5600 num_exprs++;
5601
5602 if (num_exprs == 1) {
5603 expr = nft_setelem_expr_at(elem_expr, 0);
5604 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5605 return -1;
5606
5607 return 0;
5608 } else if (num_exprs > 1) {
5609 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5610 if (nest == NULL)
5611 goto nla_put_failure;
5612
5613 nft_setelem_expr_foreach(expr, elem_expr, size) {
5614 expr = nft_setelem_expr_at(elem_expr, size);
5615 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5616 goto nla_put_failure;
5617 }
5618 nla_nest_end(skb, nest);
5619 }
5620 return 0;
5621
5622 nla_put_failure:
5623 return -1;
5624 }
5625
nf_tables_fill_setelem(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_elem * elem,bool reset)5626 static int nf_tables_fill_setelem(struct sk_buff *skb,
5627 const struct nft_set *set,
5628 const struct nft_set_elem *elem,
5629 bool reset)
5630 {
5631 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5632 unsigned char *b = skb_tail_pointer(skb);
5633 struct nlattr *nest;
5634
5635 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5636 if (nest == NULL)
5637 goto nla_put_failure;
5638
5639 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5640 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5641 NFT_DATA_VALUE, set->klen) < 0)
5642 goto nla_put_failure;
5643
5644 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5645 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5646 NFT_DATA_VALUE, set->klen) < 0)
5647 goto nla_put_failure;
5648
5649 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5650 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5651 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5652 set->dlen) < 0)
5653 goto nla_put_failure;
5654
5655 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5656 nft_set_elem_expr_dump(skb, set, ext, reset))
5657 goto nla_put_failure;
5658
5659 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5660 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5661 (*nft_set_ext_obj(ext))->key.name) < 0)
5662 goto nla_put_failure;
5663
5664 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5665 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5666 htonl(*nft_set_ext_flags(ext))))
5667 goto nla_put_failure;
5668
5669 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5670 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5671 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5672 NFTA_SET_ELEM_PAD))
5673 goto nla_put_failure;
5674
5675 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5676 u64 expires, now = get_jiffies_64();
5677
5678 expires = *nft_set_ext_expiration(ext);
5679 if (time_before64(now, expires))
5680 expires -= now;
5681 else
5682 expires = 0;
5683
5684 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5685 nf_jiffies64_to_msecs(expires),
5686 NFTA_SET_ELEM_PAD))
5687 goto nla_put_failure;
5688 }
5689
5690 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5691 struct nft_userdata *udata;
5692
5693 udata = nft_set_ext_userdata(ext);
5694 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5695 udata->len + 1, udata->data))
5696 goto nla_put_failure;
5697 }
5698
5699 nla_nest_end(skb, nest);
5700 return 0;
5701
5702 nla_put_failure:
5703 nlmsg_trim(skb, b);
5704 return -EMSGSIZE;
5705 }
5706
5707 struct nft_set_dump_args {
5708 const struct netlink_callback *cb;
5709 struct nft_set_iter iter;
5710 struct sk_buff *skb;
5711 bool reset;
5712 };
5713
nf_tables_dump_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5714 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5715 struct nft_set *set,
5716 const struct nft_set_iter *iter,
5717 struct nft_set_elem *elem)
5718 {
5719 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5720 struct nft_set_dump_args *args;
5721
5722 if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5723 return 0;
5724
5725 args = container_of(iter, struct nft_set_dump_args, iter);
5726 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5727 }
5728
audit_log_nft_set_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)5729 static void audit_log_nft_set_reset(const struct nft_table *table,
5730 unsigned int base_seq,
5731 unsigned int nentries)
5732 {
5733 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5734
5735 audit_log_nfcfg(buf, table->family, nentries,
5736 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5737 kfree(buf);
5738 }
5739
5740 struct nft_set_dump_ctx {
5741 const struct nft_set *set;
5742 struct nft_ctx ctx;
5743 };
5744
nft_set_catchall_dump(struct net * net,struct sk_buff * skb,const struct nft_set * set,bool reset,unsigned int base_seq)5745 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5746 const struct nft_set *set, bool reset,
5747 unsigned int base_seq)
5748 {
5749 struct nft_set_elem_catchall *catchall;
5750 u8 genmask = nft_genmask_cur(net);
5751 struct nft_set_elem elem;
5752 struct nft_set_ext *ext;
5753 int ret = 0;
5754
5755 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5756 ext = nft_set_elem_ext(set, catchall->elem);
5757 if (!nft_set_elem_active(ext, genmask) ||
5758 nft_set_elem_expired(ext))
5759 continue;
5760
5761 elem.priv = catchall->elem;
5762 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5763 if (reset && !ret)
5764 audit_log_nft_set_reset(set->table, base_seq, 1);
5765 break;
5766 }
5767
5768 return ret;
5769 }
5770
nf_tables_dump_set(struct sk_buff * skb,struct netlink_callback * cb)5771 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5772 {
5773 struct nft_set_dump_ctx *dump_ctx = cb->data;
5774 struct net *net = sock_net(skb->sk);
5775 struct nftables_pernet *nft_net;
5776 struct nft_table *table;
5777 struct nft_set *set;
5778 struct nft_set_dump_args args;
5779 bool set_found = false;
5780 struct nlmsghdr *nlh;
5781 struct nlattr *nest;
5782 bool reset = false;
5783 u32 portid, seq;
5784 int event;
5785
5786 rcu_read_lock();
5787 nft_net = nft_pernet(net);
5788 cb->seq = READ_ONCE(nft_net->base_seq);
5789
5790 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5791 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5792 dump_ctx->ctx.family != table->family)
5793 continue;
5794
5795 if (table != dump_ctx->ctx.table)
5796 continue;
5797
5798 list_for_each_entry_rcu(set, &table->sets, list) {
5799 if (set == dump_ctx->set) {
5800 set_found = true;
5801 break;
5802 }
5803 }
5804 break;
5805 }
5806
5807 if (!set_found) {
5808 rcu_read_unlock();
5809 return -ENOENT;
5810 }
5811
5812 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5813 portid = NETLINK_CB(cb->skb).portid;
5814 seq = cb->nlh->nlmsg_seq;
5815
5816 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5817 table->family, NFNETLINK_V0, nft_base_seq(net));
5818 if (!nlh)
5819 goto nla_put_failure;
5820
5821 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5822 goto nla_put_failure;
5823 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5824 goto nla_put_failure;
5825
5826 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5827 if (nest == NULL)
5828 goto nla_put_failure;
5829
5830 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5831 reset = true;
5832
5833 args.cb = cb;
5834 args.skb = skb;
5835 args.reset = reset;
5836 args.iter.genmask = nft_genmask_cur(net);
5837 args.iter.skip = cb->args[0];
5838 args.iter.count = 0;
5839 args.iter.err = 0;
5840 args.iter.fn = nf_tables_dump_setelem;
5841 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5842
5843 if (!args.iter.err && args.iter.count == cb->args[0])
5844 args.iter.err = nft_set_catchall_dump(net, skb, set,
5845 reset, cb->seq);
5846 nla_nest_end(skb, nest);
5847 nlmsg_end(skb, nlh);
5848
5849 if (reset && args.iter.count > args.iter.skip)
5850 audit_log_nft_set_reset(table, cb->seq,
5851 args.iter.count - args.iter.skip);
5852
5853 rcu_read_unlock();
5854
5855 if (args.iter.err && args.iter.err != -EMSGSIZE)
5856 return args.iter.err;
5857 if (args.iter.count == cb->args[0])
5858 return 0;
5859
5860 cb->args[0] = args.iter.count;
5861 return skb->len;
5862
5863 nla_put_failure:
5864 rcu_read_unlock();
5865 return -ENOSPC;
5866 }
5867
nf_tables_dump_set_start(struct netlink_callback * cb)5868 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5869 {
5870 struct nft_set_dump_ctx *dump_ctx = cb->data;
5871
5872 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5873
5874 return cb->data ? 0 : -ENOMEM;
5875 }
5876
nf_tables_dump_set_done(struct netlink_callback * cb)5877 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5878 {
5879 kfree(cb->data);
5880 return 0;
5881 }
5882
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)5883 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5884 const struct nft_ctx *ctx, u32 seq,
5885 u32 portid, int event, u16 flags,
5886 const struct nft_set *set,
5887 const struct nft_set_elem *elem,
5888 bool reset)
5889 {
5890 struct nlmsghdr *nlh;
5891 struct nlattr *nest;
5892 int err;
5893
5894 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5895 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5896 NFNETLINK_V0, nft_base_seq(ctx->net));
5897 if (!nlh)
5898 goto nla_put_failure;
5899
5900 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5901 goto nla_put_failure;
5902 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5903 goto nla_put_failure;
5904
5905 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5906 if (nest == NULL)
5907 goto nla_put_failure;
5908
5909 err = nf_tables_fill_setelem(skb, set, elem, reset);
5910 if (err < 0)
5911 goto nla_put_failure;
5912
5913 nla_nest_end(skb, nest);
5914
5915 nlmsg_end(skb, nlh);
5916 return 0;
5917
5918 nla_put_failure:
5919 nlmsg_trim(skb, nlh);
5920 return -1;
5921 }
5922
nft_setelem_parse_flags(const struct nft_set * set,const struct nlattr * attr,u32 * flags)5923 static int nft_setelem_parse_flags(const struct nft_set *set,
5924 const struct nlattr *attr, u32 *flags)
5925 {
5926 if (attr == NULL)
5927 return 0;
5928
5929 *flags = ntohl(nla_get_be32(attr));
5930 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5931 return -EOPNOTSUPP;
5932 if (!(set->flags & NFT_SET_INTERVAL) &&
5933 *flags & NFT_SET_ELEM_INTERVAL_END)
5934 return -EINVAL;
5935 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5936 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5937 return -EINVAL;
5938
5939 return 0;
5940 }
5941
nft_setelem_parse_key(struct nft_ctx * ctx,struct nft_set * set,struct nft_data * key,struct nlattr * attr)5942 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5943 struct nft_data *key, struct nlattr *attr)
5944 {
5945 struct nft_data_desc desc = {
5946 .type = NFT_DATA_VALUE,
5947 .size = NFT_DATA_VALUE_MAXLEN,
5948 .len = set->klen,
5949 };
5950
5951 return nft_data_init(ctx, key, &desc, attr);
5952 }
5953
nft_setelem_parse_data(struct nft_ctx * ctx,struct nft_set * set,struct nft_data_desc * desc,struct nft_data * data,struct nlattr * attr)5954 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5955 struct nft_data_desc *desc,
5956 struct nft_data *data,
5957 struct nlattr *attr)
5958 {
5959 u32 dtype;
5960
5961 if (set->dtype == NFT_DATA_VERDICT)
5962 dtype = NFT_DATA_VERDICT;
5963 else
5964 dtype = NFT_DATA_VALUE;
5965
5966 desc->type = dtype;
5967 desc->size = NFT_DATA_VALUE_MAXLEN;
5968 desc->len = set->dlen;
5969 desc->flags = NFT_DATA_DESC_SETELEM;
5970
5971 return nft_data_init(ctx, data, desc, attr);
5972 }
5973
nft_setelem_catchall_get(const struct net * net,const struct nft_set * set)5974 static void *nft_setelem_catchall_get(const struct net *net,
5975 const struct nft_set *set)
5976 {
5977 struct nft_set_elem_catchall *catchall;
5978 u8 genmask = nft_genmask_cur(net);
5979 struct nft_set_ext *ext;
5980 void *priv = NULL;
5981
5982 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5983 ext = nft_set_elem_ext(set, catchall->elem);
5984 if (!nft_set_elem_active(ext, genmask) ||
5985 nft_set_elem_expired(ext))
5986 continue;
5987
5988 priv = catchall->elem;
5989 break;
5990 }
5991
5992 return priv;
5993 }
5994
nft_setelem_get(struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem,u32 flags)5995 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5996 struct nft_set_elem *elem, u32 flags)
5997 {
5998 void *priv;
5999
6000 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6001 priv = set->ops->get(ctx->net, set, elem, flags);
6002 if (IS_ERR(priv))
6003 return PTR_ERR(priv);
6004 } else {
6005 priv = nft_setelem_catchall_get(ctx->net, set);
6006 if (!priv)
6007 return -ENOENT;
6008 }
6009 elem->priv = priv;
6010
6011 return 0;
6012 }
6013
nft_get_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,bool reset)6014 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6015 const struct nlattr *attr, bool reset)
6016 {
6017 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6018 struct nft_set_elem elem;
6019 struct sk_buff *skb;
6020 uint32_t flags = 0;
6021 int err;
6022
6023 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6024 nft_set_elem_policy, NULL);
6025 if (err < 0)
6026 return err;
6027
6028 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6029 if (err < 0)
6030 return err;
6031
6032 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6033 return -EINVAL;
6034
6035 if (nla[NFTA_SET_ELEM_KEY]) {
6036 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6037 nla[NFTA_SET_ELEM_KEY]);
6038 if (err < 0)
6039 return err;
6040 }
6041
6042 if (nla[NFTA_SET_ELEM_KEY_END]) {
6043 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6044 nla[NFTA_SET_ELEM_KEY_END]);
6045 if (err < 0)
6046 return err;
6047 }
6048
6049 err = nft_setelem_get(ctx, set, &elem, flags);
6050 if (err < 0)
6051 return err;
6052
6053 err = -ENOMEM;
6054 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6055 if (skb == NULL)
6056 return err;
6057
6058 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6059 NFT_MSG_NEWSETELEM, 0, set, &elem,
6060 reset);
6061 if (err < 0)
6062 goto err_fill_setelem;
6063
6064 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6065
6066 err_fill_setelem:
6067 kfree_skb(skb);
6068 return err;
6069 }
6070
6071 /* called with rcu_read_lock held */
nf_tables_getsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6072 static int nf_tables_getsetelem(struct sk_buff *skb,
6073 const struct nfnl_info *info,
6074 const struct nlattr * const nla[])
6075 {
6076 struct netlink_ext_ack *extack = info->extack;
6077 u8 genmask = nft_genmask_cur(info->net);
6078 u8 family = info->nfmsg->nfgen_family;
6079 int rem, err = 0, nelems = 0;
6080 struct net *net = info->net;
6081 struct nft_table *table;
6082 struct nft_set *set;
6083 struct nlattr *attr;
6084 struct nft_ctx ctx;
6085 bool reset = false;
6086
6087 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6088 genmask, 0);
6089 if (IS_ERR(table)) {
6090 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6091 return PTR_ERR(table);
6092 }
6093
6094 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6095 if (IS_ERR(set))
6096 return PTR_ERR(set);
6097
6098 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6099
6100 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6101 struct netlink_dump_control c = {
6102 .start = nf_tables_dump_set_start,
6103 .dump = nf_tables_dump_set,
6104 .done = nf_tables_dump_set_done,
6105 .module = THIS_MODULE,
6106 };
6107 struct nft_set_dump_ctx dump_ctx = {
6108 .set = set,
6109 .ctx = ctx,
6110 };
6111
6112 c.data = &dump_ctx;
6113 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6114 }
6115
6116 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6117 return -EINVAL;
6118
6119 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6120 reset = true;
6121
6122 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6123 err = nft_get_set_elem(&ctx, set, attr, reset);
6124 if (err < 0) {
6125 NL_SET_BAD_ATTR(extack, attr);
6126 break;
6127 }
6128 nelems++;
6129 }
6130
6131 if (reset)
6132 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6133 nelems);
6134
6135 return err;
6136 }
6137
nf_tables_setelem_notify(const struct nft_ctx * ctx,const struct nft_set * set,const struct nft_set_elem * elem,int event)6138 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6139 const struct nft_set *set,
6140 const struct nft_set_elem *elem,
6141 int event)
6142 {
6143 struct nftables_pernet *nft_net;
6144 struct net *net = ctx->net;
6145 u32 portid = ctx->portid;
6146 struct sk_buff *skb;
6147 u16 flags = 0;
6148 int err;
6149
6150 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6151 return;
6152
6153 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6154 if (skb == NULL)
6155 goto err;
6156
6157 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6158 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6159
6160 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6161 set, elem, false);
6162 if (err < 0) {
6163 kfree_skb(skb);
6164 goto err;
6165 }
6166
6167 nft_net = nft_pernet(net);
6168 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6169 return;
6170 err:
6171 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6172 }
6173
nft_trans_elem_alloc(struct nft_ctx * ctx,int msg_type,struct nft_set * set)6174 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6175 int msg_type,
6176 struct nft_set *set)
6177 {
6178 struct nft_trans *trans;
6179
6180 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6181 if (trans == NULL)
6182 return NULL;
6183
6184 nft_trans_elem_set(trans) = set;
6185 return trans;
6186 }
6187
nft_set_elem_expr_alloc(const struct nft_ctx * ctx,const struct nft_set * set,const struct nlattr * attr)6188 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6189 const struct nft_set *set,
6190 const struct nlattr *attr)
6191 {
6192 struct nft_expr *expr;
6193 int err;
6194
6195 expr = nft_expr_init(ctx, attr);
6196 if (IS_ERR(expr))
6197 return expr;
6198
6199 err = -EOPNOTSUPP;
6200 if (expr->ops->type->flags & NFT_EXPR_GC) {
6201 if (set->flags & NFT_SET_TIMEOUT)
6202 goto err_set_elem_expr;
6203 if (!set->ops->gc_init)
6204 goto err_set_elem_expr;
6205 set->ops->gc_init(set);
6206 }
6207
6208 return expr;
6209
6210 err_set_elem_expr:
6211 nft_expr_destroy(ctx, expr);
6212 return ERR_PTR(err);
6213 }
6214
nft_set_ext_check(const struct nft_set_ext_tmpl * tmpl,u8 id,u32 len)6215 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6216 {
6217 len += nft_set_ext_types[id].len;
6218 if (len > tmpl->ext_len[id] ||
6219 len > U8_MAX)
6220 return -1;
6221
6222 return 0;
6223 }
6224
nft_set_ext_memcpy(const struct nft_set_ext_tmpl * tmpl,u8 id,void * to,const void * from,u32 len)6225 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6226 void *to, const void *from, u32 len)
6227 {
6228 if (nft_set_ext_check(tmpl, id, len) < 0)
6229 return -1;
6230
6231 memcpy(to, from, len);
6232
6233 return 0;
6234 }
6235
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)6236 void *nft_set_elem_init(const struct nft_set *set,
6237 const struct nft_set_ext_tmpl *tmpl,
6238 const u32 *key, const u32 *key_end,
6239 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6240 {
6241 struct nft_set_ext *ext;
6242 void *elem;
6243
6244 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6245 if (elem == NULL)
6246 return ERR_PTR(-ENOMEM);
6247
6248 ext = nft_set_elem_ext(set, elem);
6249 nft_set_ext_init(ext, tmpl);
6250
6251 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6252 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6253 nft_set_ext_key(ext), key, set->klen) < 0)
6254 goto err_ext_check;
6255
6256 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6257 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6258 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6259 goto err_ext_check;
6260
6261 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6262 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6263 nft_set_ext_data(ext), data, set->dlen) < 0)
6264 goto err_ext_check;
6265
6266 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6267 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6268 if (expiration == 0)
6269 *nft_set_ext_expiration(ext) += timeout;
6270 }
6271 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6272 *nft_set_ext_timeout(ext) = timeout;
6273
6274 return elem;
6275
6276 err_ext_check:
6277 kfree(elem);
6278
6279 return ERR_PTR(-EINVAL);
6280 }
6281
__nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)6282 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6283 struct nft_expr *expr)
6284 {
6285 if (expr->ops->destroy_clone) {
6286 expr->ops->destroy_clone(ctx, expr);
6287 module_put(expr->ops->type->owner);
6288 } else {
6289 nf_tables_expr_destroy(ctx, expr);
6290 }
6291 }
6292
nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_set_elem_expr * elem_expr)6293 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6294 struct nft_set_elem_expr *elem_expr)
6295 {
6296 struct nft_expr *expr;
6297 u32 size;
6298
6299 nft_setelem_expr_foreach(expr, elem_expr, size)
6300 __nft_set_elem_expr_destroy(ctx, expr);
6301 }
6302
6303 /* 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)6304 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6305 bool destroy_expr)
6306 {
6307 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6308 struct nft_ctx ctx = {
6309 .net = read_pnet(&set->net),
6310 .family = set->table->family,
6311 };
6312
6313 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6314 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6315 nft_data_release(nft_set_ext_data(ext), set->dtype);
6316 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6317 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6318
6319 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6320 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6321 kfree(elem);
6322 }
6323 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6324
6325 /* Destroy element. References have been already dropped in the preparation
6326 * path via nft_setelem_data_deactivate().
6327 */
nf_tables_set_elem_destroy(const struct nft_ctx * ctx,const struct nft_set * set,void * elem)6328 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6329 const struct nft_set *set, void *elem)
6330 {
6331 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6332
6333 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6334 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6335
6336 kfree(elem);
6337 }
6338
nft_set_elem_expr_clone(const struct nft_ctx * ctx,struct nft_set * set,struct nft_expr * expr_array[])6339 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6340 struct nft_expr *expr_array[])
6341 {
6342 struct nft_expr *expr;
6343 int err, i, k;
6344
6345 for (i = 0; i < set->num_exprs; i++) {
6346 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6347 if (!expr)
6348 goto err_expr;
6349
6350 err = nft_expr_clone(expr, set->exprs[i]);
6351 if (err < 0) {
6352 kfree(expr);
6353 goto err_expr;
6354 }
6355 expr_array[i] = expr;
6356 }
6357
6358 return 0;
6359
6360 err_expr:
6361 for (k = i - 1; k >= 0; k--)
6362 nft_expr_destroy(ctx, expr_array[k]);
6363
6364 return -ENOMEM;
6365 }
6366
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)6367 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6368 const struct nft_set_ext_tmpl *tmpl,
6369 const struct nft_set_ext *ext,
6370 struct nft_expr *expr_array[],
6371 u32 num_exprs)
6372 {
6373 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6374 u32 len = sizeof(struct nft_set_elem_expr);
6375 struct nft_expr *expr;
6376 int i, err;
6377
6378 if (num_exprs == 0)
6379 return 0;
6380
6381 for (i = 0; i < num_exprs; i++)
6382 len += expr_array[i]->ops->size;
6383
6384 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6385 return -EINVAL;
6386
6387 for (i = 0; i < num_exprs; i++) {
6388 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6389 err = nft_expr_clone(expr, expr_array[i]);
6390 if (err < 0)
6391 goto err_elem_expr_setup;
6392
6393 elem_expr->size += expr_array[i]->ops->size;
6394 nft_expr_destroy(ctx, expr_array[i]);
6395 expr_array[i] = NULL;
6396 }
6397
6398 return 0;
6399
6400 err_elem_expr_setup:
6401 for (; i < num_exprs; i++) {
6402 nft_expr_destroy(ctx, expr_array[i]);
6403 expr_array[i] = NULL;
6404 }
6405
6406 return -ENOMEM;
6407 }
6408
nft_set_catchall_lookup(const struct net * net,const struct nft_set * set)6409 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6410 const struct nft_set *set)
6411 {
6412 struct nft_set_elem_catchall *catchall;
6413 u8 genmask = nft_genmask_cur(net);
6414 struct nft_set_ext *ext;
6415
6416 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6417 ext = nft_set_elem_ext(set, catchall->elem);
6418 if (nft_set_elem_active(ext, genmask) &&
6419 !nft_set_elem_expired(ext) &&
6420 !nft_set_elem_is_dead(ext))
6421 return ext;
6422 }
6423
6424 return NULL;
6425 }
6426 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6427
nft_setelem_catchall_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** pext)6428 static int nft_setelem_catchall_insert(const struct net *net,
6429 struct nft_set *set,
6430 const struct nft_set_elem *elem,
6431 struct nft_set_ext **pext)
6432 {
6433 struct nft_set_elem_catchall *catchall;
6434 u8 genmask = nft_genmask_next(net);
6435 struct nft_set_ext *ext;
6436
6437 list_for_each_entry(catchall, &set->catchall_list, list) {
6438 ext = nft_set_elem_ext(set, catchall->elem);
6439 if (nft_set_elem_active(ext, genmask)) {
6440 *pext = ext;
6441 return -EEXIST;
6442 }
6443 }
6444
6445 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6446 if (!catchall)
6447 return -ENOMEM;
6448
6449 catchall->elem = elem->priv;
6450 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6451
6452 return 0;
6453 }
6454
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)6455 static int nft_setelem_insert(const struct net *net,
6456 struct nft_set *set,
6457 const struct nft_set_elem *elem,
6458 struct nft_set_ext **ext, unsigned int flags)
6459 {
6460 int ret;
6461
6462 if (flags & NFT_SET_ELEM_CATCHALL)
6463 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6464 else
6465 ret = set->ops->insert(net, set, elem, ext);
6466
6467 return ret;
6468 }
6469
nft_setelem_is_catchall(const struct nft_set * set,const struct nft_set_elem * elem)6470 static bool nft_setelem_is_catchall(const struct nft_set *set,
6471 const struct nft_set_elem *elem)
6472 {
6473 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6474
6475 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6476 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6477 return true;
6478
6479 return false;
6480 }
6481
nft_setelem_activate(struct net * net,struct nft_set * set,struct nft_set_elem * elem)6482 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6483 struct nft_set_elem *elem)
6484 {
6485 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6486
6487 if (nft_setelem_is_catchall(set, elem)) {
6488 nft_set_elem_change_active(net, set, ext);
6489 } else {
6490 set->ops->activate(net, set, elem);
6491 }
6492 }
6493
nft_setelem_catchall_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6494 static int nft_setelem_catchall_deactivate(const struct net *net,
6495 struct nft_set *set,
6496 struct nft_set_elem *elem)
6497 {
6498 struct nft_set_elem_catchall *catchall;
6499 struct nft_set_ext *ext;
6500
6501 list_for_each_entry(catchall, &set->catchall_list, list) {
6502 ext = nft_set_elem_ext(set, catchall->elem);
6503 if (!nft_is_active_next(net, ext))
6504 continue;
6505
6506 kfree(elem->priv);
6507 elem->priv = catchall->elem;
6508 nft_set_elem_change_active(net, set, ext);
6509 return 0;
6510 }
6511
6512 return -ENOENT;
6513 }
6514
__nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6515 static int __nft_setelem_deactivate(const struct net *net,
6516 struct nft_set *set,
6517 struct nft_set_elem *elem)
6518 {
6519 void *priv;
6520
6521 priv = set->ops->deactivate(net, set, elem);
6522 if (!priv)
6523 return -ENOENT;
6524
6525 kfree(elem->priv);
6526 elem->priv = priv;
6527 set->ndeact++;
6528
6529 return 0;
6530 }
6531
nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6532 static int nft_setelem_deactivate(const struct net *net,
6533 struct nft_set *set,
6534 struct nft_set_elem *elem, u32 flags)
6535 {
6536 int ret;
6537
6538 if (flags & NFT_SET_ELEM_CATCHALL)
6539 ret = nft_setelem_catchall_deactivate(net, set, elem);
6540 else
6541 ret = __nft_setelem_deactivate(net, set, elem);
6542
6543 return ret;
6544 }
6545
nft_setelem_catchall_destroy(struct nft_set_elem_catchall * catchall)6546 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6547 {
6548 list_del_rcu(&catchall->list);
6549 kfree_rcu(catchall, rcu);
6550 }
6551
nft_setelem_catchall_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6552 static void nft_setelem_catchall_remove(const struct net *net,
6553 const struct nft_set *set,
6554 const struct nft_set_elem *elem)
6555 {
6556 struct nft_set_elem_catchall *catchall, *next;
6557
6558 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6559 if (catchall->elem == elem->priv) {
6560 nft_setelem_catchall_destroy(catchall);
6561 break;
6562 }
6563 }
6564 }
6565
nft_setelem_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6566 static void nft_setelem_remove(const struct net *net,
6567 const struct nft_set *set,
6568 const struct nft_set_elem *elem)
6569 {
6570 if (nft_setelem_is_catchall(set, elem))
6571 nft_setelem_catchall_remove(net, set, elem);
6572 else
6573 set->ops->remove(net, set, elem);
6574 }
6575
nft_setelem_valid_key_end(const struct nft_set * set,struct nlattr ** nla,u32 flags)6576 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6577 struct nlattr **nla, u32 flags)
6578 {
6579 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6580 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6581 if (flags & NFT_SET_ELEM_INTERVAL_END)
6582 return false;
6583
6584 if (nla[NFTA_SET_ELEM_KEY_END] &&
6585 flags & NFT_SET_ELEM_CATCHALL)
6586 return false;
6587 } else {
6588 if (nla[NFTA_SET_ELEM_KEY_END])
6589 return false;
6590 }
6591
6592 return true;
6593 }
6594
nft_add_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,u32 nlmsg_flags)6595 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6596 const struct nlattr *attr, u32 nlmsg_flags)
6597 {
6598 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6599 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6600 u8 genmask = nft_genmask_next(ctx->net);
6601 u32 flags = 0, size = 0, num_exprs = 0;
6602 struct nft_set_ext_tmpl tmpl;
6603 struct nft_set_ext *ext, *ext2;
6604 struct nft_set_elem elem;
6605 struct nft_set_binding *binding;
6606 struct nft_object *obj = NULL;
6607 struct nft_userdata *udata;
6608 struct nft_data_desc desc;
6609 enum nft_registers dreg;
6610 struct nft_trans *trans;
6611 u64 timeout;
6612 u64 expiration;
6613 int err, i;
6614 u8 ulen;
6615
6616 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6617 nft_set_elem_policy, NULL);
6618 if (err < 0)
6619 return err;
6620
6621 nft_set_ext_prepare(&tmpl);
6622
6623 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6624 if (err < 0)
6625 return err;
6626
6627 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6628 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6629 return -EINVAL;
6630
6631 if (flags != 0) {
6632 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6633 if (err < 0)
6634 return err;
6635 }
6636
6637 if (set->flags & NFT_SET_MAP) {
6638 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6639 !(flags & NFT_SET_ELEM_INTERVAL_END))
6640 return -EINVAL;
6641 } else {
6642 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6643 return -EINVAL;
6644 }
6645
6646 if (set->flags & NFT_SET_OBJECT) {
6647 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6648 !(flags & NFT_SET_ELEM_INTERVAL_END))
6649 return -EINVAL;
6650 } else {
6651 if (nla[NFTA_SET_ELEM_OBJREF])
6652 return -EINVAL;
6653 }
6654
6655 if (!nft_setelem_valid_key_end(set, nla, flags))
6656 return -EINVAL;
6657
6658 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6659 (nla[NFTA_SET_ELEM_DATA] ||
6660 nla[NFTA_SET_ELEM_OBJREF] ||
6661 nla[NFTA_SET_ELEM_TIMEOUT] ||
6662 nla[NFTA_SET_ELEM_EXPIRATION] ||
6663 nla[NFTA_SET_ELEM_USERDATA] ||
6664 nla[NFTA_SET_ELEM_EXPR] ||
6665 nla[NFTA_SET_ELEM_KEY_END] ||
6666 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6667 return -EINVAL;
6668
6669 timeout = 0;
6670 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6671 if (!(set->flags & NFT_SET_TIMEOUT))
6672 return -EINVAL;
6673 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6674 &timeout);
6675 if (err)
6676 return err;
6677 } else if (set->flags & NFT_SET_TIMEOUT &&
6678 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6679 timeout = READ_ONCE(set->timeout);
6680 }
6681
6682 expiration = 0;
6683 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6684 if (!(set->flags & NFT_SET_TIMEOUT))
6685 return -EINVAL;
6686 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6687 &expiration);
6688 if (err)
6689 return err;
6690 }
6691
6692 if (nla[NFTA_SET_ELEM_EXPR]) {
6693 struct nft_expr *expr;
6694
6695 if (set->num_exprs && set->num_exprs != 1)
6696 return -EOPNOTSUPP;
6697
6698 expr = nft_set_elem_expr_alloc(ctx, set,
6699 nla[NFTA_SET_ELEM_EXPR]);
6700 if (IS_ERR(expr))
6701 return PTR_ERR(expr);
6702
6703 expr_array[0] = expr;
6704 num_exprs = 1;
6705
6706 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6707 err = -EOPNOTSUPP;
6708 goto err_set_elem_expr;
6709 }
6710 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6711 struct nft_expr *expr;
6712 struct nlattr *tmp;
6713 int left;
6714
6715 i = 0;
6716 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6717 if (i == NFT_SET_EXPR_MAX ||
6718 (set->num_exprs && set->num_exprs == i)) {
6719 err = -E2BIG;
6720 goto err_set_elem_expr;
6721 }
6722 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6723 err = -EINVAL;
6724 goto err_set_elem_expr;
6725 }
6726 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6727 if (IS_ERR(expr)) {
6728 err = PTR_ERR(expr);
6729 goto err_set_elem_expr;
6730 }
6731 expr_array[i] = expr;
6732 num_exprs++;
6733
6734 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6735 err = -EOPNOTSUPP;
6736 goto err_set_elem_expr;
6737 }
6738 i++;
6739 }
6740 if (set->num_exprs && set->num_exprs != i) {
6741 err = -EOPNOTSUPP;
6742 goto err_set_elem_expr;
6743 }
6744 } else if (set->num_exprs > 0 &&
6745 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6746 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6747 if (err < 0)
6748 goto err_set_elem_expr_clone;
6749
6750 num_exprs = set->num_exprs;
6751 }
6752
6753 if (nla[NFTA_SET_ELEM_KEY]) {
6754 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6755 nla[NFTA_SET_ELEM_KEY]);
6756 if (err < 0)
6757 goto err_set_elem_expr;
6758
6759 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6760 if (err < 0)
6761 goto err_parse_key;
6762 }
6763
6764 if (nla[NFTA_SET_ELEM_KEY_END]) {
6765 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6766 nla[NFTA_SET_ELEM_KEY_END]);
6767 if (err < 0)
6768 goto err_parse_key;
6769
6770 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6771 if (err < 0)
6772 goto err_parse_key_end;
6773 }
6774
6775 if (timeout > 0) {
6776 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6777 if (err < 0)
6778 goto err_parse_key_end;
6779
6780 if (timeout != READ_ONCE(set->timeout)) {
6781 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6782 if (err < 0)
6783 goto err_parse_key_end;
6784 }
6785 }
6786
6787 if (num_exprs) {
6788 for (i = 0; i < num_exprs; i++)
6789 size += expr_array[i]->ops->size;
6790
6791 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6792 sizeof(struct nft_set_elem_expr) + size);
6793 if (err < 0)
6794 goto err_parse_key_end;
6795 }
6796
6797 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6798 obj = nft_obj_lookup(ctx->net, ctx->table,
6799 nla[NFTA_SET_ELEM_OBJREF],
6800 set->objtype, genmask);
6801 if (IS_ERR(obj)) {
6802 err = PTR_ERR(obj);
6803 obj = NULL;
6804 goto err_parse_key_end;
6805 }
6806
6807 if (!nft_use_inc(&obj->use)) {
6808 err = -EMFILE;
6809 obj = NULL;
6810 goto err_parse_key_end;
6811 }
6812
6813 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6814 if (err < 0)
6815 goto err_parse_key_end;
6816 }
6817
6818 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6819 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6820 nla[NFTA_SET_ELEM_DATA]);
6821 if (err < 0)
6822 goto err_parse_key_end;
6823
6824 dreg = nft_type_to_reg(set->dtype);
6825 list_for_each_entry(binding, &set->bindings, list) {
6826 struct nft_ctx bind_ctx = {
6827 .net = ctx->net,
6828 .family = ctx->family,
6829 .table = ctx->table,
6830 .chain = (struct nft_chain *)binding->chain,
6831 };
6832
6833 if (!(binding->flags & NFT_SET_MAP))
6834 continue;
6835
6836 err = nft_validate_register_store(&bind_ctx, dreg,
6837 &elem.data.val,
6838 desc.type, desc.len);
6839 if (err < 0)
6840 goto err_parse_data;
6841
6842 if (desc.type == NFT_DATA_VERDICT &&
6843 (elem.data.val.verdict.code == NFT_GOTO ||
6844 elem.data.val.verdict.code == NFT_JUMP))
6845 nft_validate_state_update(ctx->table,
6846 NFT_VALIDATE_NEED);
6847 }
6848
6849 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6850 if (err < 0)
6851 goto err_parse_data;
6852 }
6853
6854 /* The full maximum length of userdata can exceed the maximum
6855 * offset value (U8_MAX) for following extensions, therefor it
6856 * must be the last extension added.
6857 */
6858 ulen = 0;
6859 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6860 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6861 if (ulen > 0) {
6862 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6863 ulen);
6864 if (err < 0)
6865 goto err_parse_data;
6866 }
6867 }
6868
6869 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6870 elem.key_end.val.data, elem.data.val.data,
6871 timeout, expiration, GFP_KERNEL_ACCOUNT);
6872 if (IS_ERR(elem.priv)) {
6873 err = PTR_ERR(elem.priv);
6874 goto err_parse_data;
6875 }
6876
6877 ext = nft_set_elem_ext(set, elem.priv);
6878 if (flags)
6879 *nft_set_ext_flags(ext) = flags;
6880
6881 if (obj)
6882 *nft_set_ext_obj(ext) = obj;
6883
6884 if (ulen > 0) {
6885 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6886 err = -EINVAL;
6887 goto err_elem_free;
6888 }
6889 udata = nft_set_ext_userdata(ext);
6890 udata->len = ulen - 1;
6891 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6892 }
6893 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6894 if (err < 0)
6895 goto err_elem_free;
6896
6897 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6898 if (trans == NULL) {
6899 err = -ENOMEM;
6900 goto err_elem_free;
6901 }
6902
6903 ext->genmask = nft_genmask_cur(ctx->net);
6904
6905 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6906 if (err) {
6907 if (err == -EEXIST) {
6908 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6909 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6910 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6911 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6912 goto err_element_clash;
6913 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6914 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6915 memcmp(nft_set_ext_data(ext),
6916 nft_set_ext_data(ext2), set->dlen) != 0) ||
6917 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6918 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6919 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6920 goto err_element_clash;
6921 else if (!(nlmsg_flags & NLM_F_EXCL))
6922 err = 0;
6923 } else if (err == -ENOTEMPTY) {
6924 /* ENOTEMPTY reports overlapping between this element
6925 * and an existing one.
6926 */
6927 err = -EEXIST;
6928 }
6929 goto err_element_clash;
6930 }
6931
6932 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6933 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6934
6935 if (!atomic_add_unless(&set->nelems, 1, max)) {
6936 err = -ENFILE;
6937 goto err_set_full;
6938 }
6939 }
6940
6941 nft_trans_elem(trans) = elem;
6942 nft_trans_commit_list_add_tail(ctx->net, trans);
6943 return 0;
6944
6945 err_set_full:
6946 nft_setelem_remove(ctx->net, set, &elem);
6947 err_element_clash:
6948 kfree(trans);
6949 err_elem_free:
6950 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6951 err_parse_data:
6952 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6953 nft_data_release(&elem.data.val, desc.type);
6954 err_parse_key_end:
6955 if (obj)
6956 nft_use_dec_restore(&obj->use);
6957
6958 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6959 err_parse_key:
6960 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6961 err_set_elem_expr:
6962 for (i = 0; i < num_exprs && expr_array[i]; i++)
6963 nft_expr_destroy(ctx, expr_array[i]);
6964 err_set_elem_expr_clone:
6965 return err;
6966 }
6967
nf_tables_newsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6968 static int nf_tables_newsetelem(struct sk_buff *skb,
6969 const struct nfnl_info *info,
6970 const struct nlattr * const nla[])
6971 {
6972 struct netlink_ext_ack *extack = info->extack;
6973 u8 genmask = nft_genmask_next(info->net);
6974 u8 family = info->nfmsg->nfgen_family;
6975 struct net *net = info->net;
6976 const struct nlattr *attr;
6977 struct nft_table *table;
6978 struct nft_set *set;
6979 struct nft_ctx ctx;
6980 int rem, err;
6981
6982 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6983 return -EINVAL;
6984
6985 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6986 genmask, NETLINK_CB(skb).portid);
6987 if (IS_ERR(table)) {
6988 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6989 return PTR_ERR(table);
6990 }
6991
6992 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6993 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6994 if (IS_ERR(set))
6995 return PTR_ERR(set);
6996
6997 if (!list_empty(&set->bindings) &&
6998 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6999 return -EBUSY;
7000
7001 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7002
7003 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7004 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7005 if (err < 0) {
7006 NL_SET_BAD_ATTR(extack, attr);
7007 return err;
7008 }
7009 }
7010
7011 if (table->validate_state == NFT_VALIDATE_DO)
7012 return nft_table_validate(net, table);
7013
7014 return 0;
7015 }
7016
7017 /**
7018 * nft_data_hold - hold a nft_data item
7019 *
7020 * @data: struct nft_data to release
7021 * @type: type of data
7022 *
7023 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7024 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7025 * NFT_GOTO verdicts. This function must be called on active data objects
7026 * from the second phase of the commit protocol.
7027 */
nft_data_hold(const struct nft_data * data,enum nft_data_types type)7028 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7029 {
7030 struct nft_chain *chain;
7031
7032 if (type == NFT_DATA_VERDICT) {
7033 switch (data->verdict.code) {
7034 case NFT_JUMP:
7035 case NFT_GOTO:
7036 chain = data->verdict.chain;
7037 nft_use_inc_restore(&chain->use);
7038 break;
7039 }
7040 }
7041 }
7042
nft_setelem_data_activate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7043 static void nft_setelem_data_activate(const struct net *net,
7044 const struct nft_set *set,
7045 struct nft_set_elem *elem)
7046 {
7047 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7048
7049 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7050 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7051 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7052 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7053 }
7054
nft_setelem_data_deactivate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7055 void nft_setelem_data_deactivate(const struct net *net,
7056 const struct nft_set *set,
7057 struct nft_set_elem *elem)
7058 {
7059 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7060
7061 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7062 nft_data_release(nft_set_ext_data(ext), set->dtype);
7063 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7064 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7065 }
7066
nft_del_setelem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr)7067 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7068 const struct nlattr *attr)
7069 {
7070 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7071 struct nft_set_ext_tmpl tmpl;
7072 struct nft_set_elem elem;
7073 struct nft_set_ext *ext;
7074 struct nft_trans *trans;
7075 u32 flags = 0;
7076 int err;
7077
7078 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7079 nft_set_elem_policy, NULL);
7080 if (err < 0)
7081 return err;
7082
7083 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7084 if (err < 0)
7085 return err;
7086
7087 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7088 return -EINVAL;
7089
7090 if (!nft_setelem_valid_key_end(set, nla, flags))
7091 return -EINVAL;
7092
7093 nft_set_ext_prepare(&tmpl);
7094
7095 if (flags != 0) {
7096 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7097 if (err < 0)
7098 return err;
7099 }
7100
7101 if (nla[NFTA_SET_ELEM_KEY]) {
7102 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7103 nla[NFTA_SET_ELEM_KEY]);
7104 if (err < 0)
7105 return err;
7106
7107 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7108 if (err < 0)
7109 goto fail_elem;
7110 }
7111
7112 if (nla[NFTA_SET_ELEM_KEY_END]) {
7113 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7114 nla[NFTA_SET_ELEM_KEY_END]);
7115 if (err < 0)
7116 goto fail_elem;
7117
7118 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7119 if (err < 0)
7120 goto fail_elem_key_end;
7121 }
7122
7123 err = -ENOMEM;
7124 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7125 elem.key_end.val.data, NULL, 0, 0,
7126 GFP_KERNEL_ACCOUNT);
7127 if (IS_ERR(elem.priv)) {
7128 err = PTR_ERR(elem.priv);
7129 goto fail_elem_key_end;
7130 }
7131
7132 ext = nft_set_elem_ext(set, elem.priv);
7133 if (flags)
7134 *nft_set_ext_flags(ext) = flags;
7135
7136 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7137 if (trans == NULL)
7138 goto fail_trans;
7139
7140 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7141 if (err < 0)
7142 goto fail_ops;
7143
7144 nft_setelem_data_deactivate(ctx->net, set, &elem);
7145
7146 nft_trans_elem(trans) = elem;
7147 nft_trans_commit_list_add_tail(ctx->net, trans);
7148 return 0;
7149
7150 fail_ops:
7151 kfree(trans);
7152 fail_trans:
7153 kfree(elem.priv);
7154 fail_elem_key_end:
7155 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7156 fail_elem:
7157 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7158 return err;
7159 }
7160
nft_setelem_flush(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)7161 static int nft_setelem_flush(const struct nft_ctx *ctx,
7162 struct nft_set *set,
7163 const struct nft_set_iter *iter,
7164 struct nft_set_elem *elem)
7165 {
7166 struct nft_trans *trans;
7167 int err;
7168
7169 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7170 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7171 if (!trans)
7172 return -ENOMEM;
7173
7174 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7175 err = -ENOENT;
7176 goto err1;
7177 }
7178 set->ndeact++;
7179
7180 nft_setelem_data_deactivate(ctx->net, set, elem);
7181 nft_trans_elem_set(trans) = set;
7182 nft_trans_elem(trans) = *elem;
7183 nft_trans_commit_list_add_tail(ctx->net, trans);
7184
7185 return 0;
7186 err1:
7187 kfree(trans);
7188 return err;
7189 }
7190
__nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)7191 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7192 struct nft_set *set,
7193 struct nft_set_elem *elem)
7194 {
7195 struct nft_trans *trans;
7196
7197 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7198 sizeof(struct nft_trans_elem), GFP_KERNEL);
7199 if (!trans)
7200 return -ENOMEM;
7201
7202 nft_setelem_data_deactivate(ctx->net, set, elem);
7203 nft_trans_elem_set(trans) = set;
7204 nft_trans_elem(trans) = *elem;
7205 nft_trans_commit_list_add_tail(ctx->net, trans);
7206
7207 return 0;
7208 }
7209
nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set)7210 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7211 struct nft_set *set)
7212 {
7213 u8 genmask = nft_genmask_next(ctx->net);
7214 struct nft_set_elem_catchall *catchall;
7215 struct nft_set_elem elem;
7216 struct nft_set_ext *ext;
7217 int ret = 0;
7218
7219 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7220 ext = nft_set_elem_ext(set, catchall->elem);
7221 if (!nft_set_elem_active(ext, genmask))
7222 continue;
7223
7224 elem.priv = catchall->elem;
7225 ret = __nft_set_catchall_flush(ctx, set, &elem);
7226 if (ret < 0)
7227 break;
7228 nft_set_elem_change_active(ctx->net, set, ext);
7229 }
7230
7231 return ret;
7232 }
7233
nft_set_flush(struct nft_ctx * ctx,struct nft_set * set,u8 genmask)7234 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7235 {
7236 struct nft_set_iter iter = {
7237 .genmask = genmask,
7238 .fn = nft_setelem_flush,
7239 };
7240
7241 set->ops->walk(ctx, set, &iter);
7242 if (!iter.err)
7243 iter.err = nft_set_catchall_flush(ctx, set);
7244
7245 return iter.err;
7246 }
7247
nf_tables_delsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7248 static int nf_tables_delsetelem(struct sk_buff *skb,
7249 const struct nfnl_info *info,
7250 const struct nlattr * const nla[])
7251 {
7252 struct netlink_ext_ack *extack = info->extack;
7253 u8 genmask = nft_genmask_next(info->net);
7254 u8 family = info->nfmsg->nfgen_family;
7255 struct net *net = info->net;
7256 const struct nlattr *attr;
7257 struct nft_table *table;
7258 struct nft_set *set;
7259 struct nft_ctx ctx;
7260 int rem, err = 0;
7261
7262 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7263 genmask, NETLINK_CB(skb).portid);
7264 if (IS_ERR(table)) {
7265 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7266 return PTR_ERR(table);
7267 }
7268
7269 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7270 if (IS_ERR(set))
7271 return PTR_ERR(set);
7272
7273 if (nft_set_is_anonymous(set))
7274 return -EOPNOTSUPP;
7275
7276 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7277 return -EBUSY;
7278
7279 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7280
7281 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7282 return nft_set_flush(&ctx, set, genmask);
7283
7284 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7285 err = nft_del_setelem(&ctx, set, attr);
7286 if (err == -ENOENT &&
7287 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7288 continue;
7289
7290 if (err < 0) {
7291 NL_SET_BAD_ATTR(extack, attr);
7292 return err;
7293 }
7294 }
7295
7296 return 0;
7297 }
7298
7299 /*
7300 * Stateful objects
7301 */
7302
7303 /**
7304 * nft_register_obj- register nf_tables stateful object type
7305 * @obj_type: object type
7306 *
7307 * Registers the object type for use with nf_tables. Returns zero on
7308 * success or a negative errno code otherwise.
7309 */
nft_register_obj(struct nft_object_type * obj_type)7310 int nft_register_obj(struct nft_object_type *obj_type)
7311 {
7312 if (obj_type->type == NFT_OBJECT_UNSPEC)
7313 return -EINVAL;
7314
7315 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7316 list_add_rcu(&obj_type->list, &nf_tables_objects);
7317 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7318 return 0;
7319 }
7320 EXPORT_SYMBOL_GPL(nft_register_obj);
7321
7322 /**
7323 * nft_unregister_obj - unregister nf_tables object type
7324 * @obj_type: object type
7325 *
7326 * Unregisters the object type for use with nf_tables.
7327 */
nft_unregister_obj(struct nft_object_type * obj_type)7328 void nft_unregister_obj(struct nft_object_type *obj_type)
7329 {
7330 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7331 list_del_rcu(&obj_type->list);
7332 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7333 }
7334 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7335
nft_obj_lookup(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7336 struct nft_object *nft_obj_lookup(const struct net *net,
7337 const struct nft_table *table,
7338 const struct nlattr *nla, u32 objtype,
7339 u8 genmask)
7340 {
7341 struct nft_object_hash_key k = { .table = table };
7342 char search[NFT_OBJ_MAXNAMELEN];
7343 struct rhlist_head *tmp, *list;
7344 struct nft_object *obj;
7345
7346 nla_strscpy(search, nla, sizeof(search));
7347 k.name = search;
7348
7349 WARN_ON_ONCE(!rcu_read_lock_held() &&
7350 !lockdep_commit_lock_is_held(net));
7351
7352 rcu_read_lock();
7353 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7354 if (!list)
7355 goto out;
7356
7357 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7358 if (objtype == obj->ops->type->type &&
7359 nft_active_genmask(obj, genmask)) {
7360 rcu_read_unlock();
7361 return obj;
7362 }
7363 }
7364 out:
7365 rcu_read_unlock();
7366 return ERR_PTR(-ENOENT);
7367 }
7368 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7369
nft_obj_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7370 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7371 const struct nlattr *nla,
7372 u32 objtype, u8 genmask)
7373 {
7374 struct nft_object *obj;
7375
7376 list_for_each_entry(obj, &table->objects, list) {
7377 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7378 objtype == obj->ops->type->type &&
7379 nft_active_genmask(obj, genmask))
7380 return obj;
7381 }
7382 return ERR_PTR(-ENOENT);
7383 }
7384
7385 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7386 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7387 .len = NFT_TABLE_MAXNAMELEN - 1 },
7388 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7389 .len = NFT_OBJ_MAXNAMELEN - 1 },
7390 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7391 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7392 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7393 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7394 .len = NFT_USERDATA_MAXLEN },
7395 };
7396
nft_obj_init(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr)7397 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7398 const struct nft_object_type *type,
7399 const struct nlattr *attr)
7400 {
7401 struct nlattr **tb;
7402 const struct nft_object_ops *ops;
7403 struct nft_object *obj;
7404 int err = -ENOMEM;
7405
7406 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7407 if (!tb)
7408 goto err1;
7409
7410 if (attr) {
7411 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7412 type->policy, NULL);
7413 if (err < 0)
7414 goto err2;
7415 } else {
7416 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7417 }
7418
7419 if (type->select_ops) {
7420 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7421 if (IS_ERR(ops)) {
7422 err = PTR_ERR(ops);
7423 goto err2;
7424 }
7425 } else {
7426 ops = type->ops;
7427 }
7428
7429 err = -ENOMEM;
7430 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7431 if (!obj)
7432 goto err2;
7433
7434 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7435 if (err < 0)
7436 goto err3;
7437
7438 obj->ops = ops;
7439
7440 kfree(tb);
7441 return obj;
7442 err3:
7443 kfree(obj);
7444 err2:
7445 kfree(tb);
7446 err1:
7447 return ERR_PTR(err);
7448 }
7449
nft_object_dump(struct sk_buff * skb,unsigned int attr,struct nft_object * obj,bool reset)7450 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7451 struct nft_object *obj, bool reset)
7452 {
7453 struct nlattr *nest;
7454
7455 nest = nla_nest_start_noflag(skb, attr);
7456 if (!nest)
7457 goto nla_put_failure;
7458 if (obj->ops->dump(skb, obj, reset) < 0)
7459 goto nla_put_failure;
7460 nla_nest_end(skb, nest);
7461 return 0;
7462
7463 nla_put_failure:
7464 return -1;
7465 }
7466
__nft_obj_type_get(u32 objtype,u8 family)7467 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7468 {
7469 const struct nft_object_type *type;
7470
7471 list_for_each_entry_rcu(type, &nf_tables_objects, list) {
7472 if (type->family != NFPROTO_UNSPEC &&
7473 type->family != family)
7474 continue;
7475
7476 if (objtype == type->type)
7477 return type;
7478 }
7479 return NULL;
7480 }
7481
7482 static const struct nft_object_type *
nft_obj_type_get(struct net * net,u32 objtype,u8 family)7483 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7484 {
7485 const struct nft_object_type *type;
7486
7487 rcu_read_lock();
7488 type = __nft_obj_type_get(objtype, family);
7489 if (type != NULL && try_module_get(type->owner)) {
7490 rcu_read_unlock();
7491 return type;
7492 }
7493 rcu_read_unlock();
7494
7495 lockdep_nfnl_nft_mutex_not_held();
7496 #ifdef CONFIG_MODULES
7497 if (type == NULL) {
7498 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7499 return ERR_PTR(-EAGAIN);
7500 }
7501 #endif
7502 return ERR_PTR(-ENOENT);
7503 }
7504
nf_tables_updobj(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr,struct nft_object * obj)7505 static int nf_tables_updobj(const struct nft_ctx *ctx,
7506 const struct nft_object_type *type,
7507 const struct nlattr *attr,
7508 struct nft_object *obj)
7509 {
7510 struct nft_object *newobj;
7511 struct nft_trans *trans;
7512 int err = -ENOMEM;
7513
7514 if (!try_module_get(type->owner))
7515 return -ENOENT;
7516
7517 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7518 sizeof(struct nft_trans_obj));
7519 if (!trans)
7520 goto err_trans;
7521
7522 newobj = nft_obj_init(ctx, type, attr);
7523 if (IS_ERR(newobj)) {
7524 err = PTR_ERR(newobj);
7525 goto err_free_trans;
7526 }
7527
7528 nft_trans_obj(trans) = obj;
7529 nft_trans_obj_update(trans) = true;
7530 nft_trans_obj_newobj(trans) = newobj;
7531 nft_trans_commit_list_add_tail(ctx->net, trans);
7532
7533 return 0;
7534
7535 err_free_trans:
7536 kfree(trans);
7537 err_trans:
7538 module_put(type->owner);
7539 return err;
7540 }
7541
nf_tables_newobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7542 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7543 const struct nlattr * const nla[])
7544 {
7545 struct netlink_ext_ack *extack = info->extack;
7546 u8 genmask = nft_genmask_next(info->net);
7547 u8 family = info->nfmsg->nfgen_family;
7548 const struct nft_object_type *type;
7549 struct net *net = info->net;
7550 struct nft_table *table;
7551 struct nft_object *obj;
7552 struct nft_ctx ctx;
7553 u32 objtype;
7554 int err;
7555
7556 if (!nla[NFTA_OBJ_TYPE] ||
7557 !nla[NFTA_OBJ_NAME] ||
7558 !nla[NFTA_OBJ_DATA])
7559 return -EINVAL;
7560
7561 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7562 NETLINK_CB(skb).portid);
7563 if (IS_ERR(table)) {
7564 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7565 return PTR_ERR(table);
7566 }
7567
7568 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7569 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7570 if (IS_ERR(obj)) {
7571 err = PTR_ERR(obj);
7572 if (err != -ENOENT) {
7573 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7574 return err;
7575 }
7576 } else {
7577 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7578 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7579 return -EEXIST;
7580 }
7581 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7582 return -EOPNOTSUPP;
7583
7584 type = __nft_obj_type_get(objtype, family);
7585 if (WARN_ON_ONCE(!type))
7586 return -ENOENT;
7587
7588 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7589
7590 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7591 }
7592
7593 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7594
7595 if (!nft_use_inc(&table->use))
7596 return -EMFILE;
7597
7598 type = nft_obj_type_get(net, objtype, family);
7599 if (IS_ERR(type)) {
7600 err = PTR_ERR(type);
7601 goto err_type;
7602 }
7603
7604 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7605 if (IS_ERR(obj)) {
7606 err = PTR_ERR(obj);
7607 goto err_init;
7608 }
7609 obj->key.table = table;
7610 obj->handle = nf_tables_alloc_handle(table);
7611
7612 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7613 if (!obj->key.name) {
7614 err = -ENOMEM;
7615 goto err_strdup;
7616 }
7617
7618 if (nla[NFTA_OBJ_USERDATA]) {
7619 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7620 if (obj->udata == NULL)
7621 goto err_userdata;
7622
7623 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7624 }
7625
7626 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7627 if (err < 0)
7628 goto err_trans;
7629
7630 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7631 nft_objname_ht_params);
7632 if (err < 0)
7633 goto err_obj_ht;
7634
7635 list_add_tail_rcu(&obj->list, &table->objects);
7636
7637 return 0;
7638 err_obj_ht:
7639 /* queued in transaction log */
7640 INIT_LIST_HEAD(&obj->list);
7641 return err;
7642 err_trans:
7643 kfree(obj->udata);
7644 err_userdata:
7645 kfree(obj->key.name);
7646 err_strdup:
7647 if (obj->ops->destroy)
7648 obj->ops->destroy(&ctx, obj);
7649 kfree(obj);
7650 err_init:
7651 module_put(type->owner);
7652 err_type:
7653 nft_use_dec_restore(&table->use);
7654
7655 return err;
7656 }
7657
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)7658 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7659 u32 portid, u32 seq, int event, u32 flags,
7660 int family, const struct nft_table *table,
7661 struct nft_object *obj, bool reset)
7662 {
7663 struct nlmsghdr *nlh;
7664
7665 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7666 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7667 NFNETLINK_V0, nft_base_seq(net));
7668 if (!nlh)
7669 goto nla_put_failure;
7670
7671 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7672 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7673 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7674 NFTA_OBJ_PAD))
7675 goto nla_put_failure;
7676
7677 if (event == NFT_MSG_DELOBJ) {
7678 nlmsg_end(skb, nlh);
7679 return 0;
7680 }
7681
7682 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7683 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7684 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7685 goto nla_put_failure;
7686
7687 if (obj->udata &&
7688 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7689 goto nla_put_failure;
7690
7691 nlmsg_end(skb, nlh);
7692 return 0;
7693
7694 nla_put_failure:
7695 nlmsg_trim(skb, nlh);
7696 return -1;
7697 }
7698
audit_log_obj_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)7699 static void audit_log_obj_reset(const struct nft_table *table,
7700 unsigned int base_seq, unsigned int nentries)
7701 {
7702 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7703
7704 audit_log_nfcfg(buf, table->family, nentries,
7705 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7706 kfree(buf);
7707 }
7708
7709 struct nft_obj_filter {
7710 char *table;
7711 u32 type;
7712 };
7713
nf_tables_dump_obj(struct sk_buff * skb,struct netlink_callback * cb)7714 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7715 {
7716 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7717 const struct nft_table *table;
7718 unsigned int idx = 0, s_idx = cb->args[0];
7719 struct nft_obj_filter *filter = cb->data;
7720 struct net *net = sock_net(skb->sk);
7721 int family = nfmsg->nfgen_family;
7722 struct nftables_pernet *nft_net;
7723 unsigned int entries = 0;
7724 struct nft_object *obj;
7725 bool reset = false;
7726 int rc = 0;
7727
7728 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7729 reset = true;
7730
7731 rcu_read_lock();
7732 nft_net = nft_pernet(net);
7733 cb->seq = READ_ONCE(nft_net->base_seq);
7734
7735 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7736 if (family != NFPROTO_UNSPEC && family != table->family)
7737 continue;
7738
7739 entries = 0;
7740 list_for_each_entry_rcu(obj, &table->objects, list) {
7741 if (!nft_is_active(net, obj))
7742 goto cont;
7743 if (idx < s_idx)
7744 goto cont;
7745 if (idx > s_idx)
7746 memset(&cb->args[1], 0,
7747 sizeof(cb->args) - sizeof(cb->args[0]));
7748 if (filter && filter->table &&
7749 strcmp(filter->table, table->name))
7750 goto cont;
7751 if (filter &&
7752 filter->type != NFT_OBJECT_UNSPEC &&
7753 obj->ops->type->type != filter->type)
7754 goto cont;
7755
7756 rc = nf_tables_fill_obj_info(skb, net,
7757 NETLINK_CB(cb->skb).portid,
7758 cb->nlh->nlmsg_seq,
7759 NFT_MSG_NEWOBJ,
7760 NLM_F_MULTI | NLM_F_APPEND,
7761 table->family, table,
7762 obj, reset);
7763 if (rc < 0)
7764 break;
7765
7766 entries++;
7767 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7768 cont:
7769 idx++;
7770 }
7771 if (reset && entries)
7772 audit_log_obj_reset(table, nft_net->base_seq, entries);
7773 if (rc < 0)
7774 break;
7775 }
7776 rcu_read_unlock();
7777
7778 cb->args[0] = idx;
7779 return skb->len;
7780 }
7781
nf_tables_dump_obj_start(struct netlink_callback * cb)7782 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7783 {
7784 const struct nlattr * const *nla = cb->data;
7785 struct nft_obj_filter *filter = NULL;
7786
7787 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7788 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7789 if (!filter)
7790 return -ENOMEM;
7791
7792 if (nla[NFTA_OBJ_TABLE]) {
7793 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7794 if (!filter->table) {
7795 kfree(filter);
7796 return -ENOMEM;
7797 }
7798 }
7799
7800 if (nla[NFTA_OBJ_TYPE])
7801 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7802 }
7803
7804 cb->data = filter;
7805 return 0;
7806 }
7807
nf_tables_dump_obj_done(struct netlink_callback * cb)7808 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7809 {
7810 struct nft_obj_filter *filter = cb->data;
7811
7812 if (filter) {
7813 kfree(filter->table);
7814 kfree(filter);
7815 }
7816
7817 return 0;
7818 }
7819
7820 /* called with rcu_read_lock held */
nf_tables_getobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7821 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7822 const struct nlattr * const nla[])
7823 {
7824 struct netlink_ext_ack *extack = info->extack;
7825 u8 genmask = nft_genmask_cur(info->net);
7826 u8 family = info->nfmsg->nfgen_family;
7827 const struct nft_table *table;
7828 struct net *net = info->net;
7829 struct nft_object *obj;
7830 struct sk_buff *skb2;
7831 bool reset = false;
7832 u32 objtype;
7833 int err;
7834
7835 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7836 struct netlink_dump_control c = {
7837 .start = nf_tables_dump_obj_start,
7838 .dump = nf_tables_dump_obj,
7839 .done = nf_tables_dump_obj_done,
7840 .module = THIS_MODULE,
7841 .data = (void *)nla,
7842 };
7843
7844 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7845 }
7846
7847 if (!nla[NFTA_OBJ_NAME] ||
7848 !nla[NFTA_OBJ_TYPE])
7849 return -EINVAL;
7850
7851 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7852 if (IS_ERR(table)) {
7853 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7854 return PTR_ERR(table);
7855 }
7856
7857 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7858 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7859 if (IS_ERR(obj)) {
7860 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7861 return PTR_ERR(obj);
7862 }
7863
7864 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7865 if (!skb2)
7866 return -ENOMEM;
7867
7868 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7869 reset = true;
7870
7871 if (reset) {
7872 const struct nftables_pernet *nft_net;
7873 char *buf;
7874
7875 nft_net = nft_pernet(net);
7876 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7877
7878 audit_log_nfcfg(buf,
7879 family,
7880 1,
7881 AUDIT_NFT_OP_OBJ_RESET,
7882 GFP_ATOMIC);
7883 kfree(buf);
7884 }
7885
7886 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7887 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7888 family, table, obj, reset);
7889 if (err < 0)
7890 goto err_fill_obj_info;
7891
7892 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7893
7894 err_fill_obj_info:
7895 kfree_skb(skb2);
7896 return err;
7897 }
7898
nft_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)7899 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7900 {
7901 if (obj->ops->destroy)
7902 obj->ops->destroy(ctx, obj);
7903
7904 module_put(obj->ops->type->owner);
7905 kfree(obj->key.name);
7906 kfree(obj->udata);
7907 kfree(obj);
7908 }
7909
nf_tables_delobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7910 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7911 const struct nlattr * const nla[])
7912 {
7913 struct netlink_ext_ack *extack = info->extack;
7914 u8 genmask = nft_genmask_next(info->net);
7915 u8 family = info->nfmsg->nfgen_family;
7916 struct net *net = info->net;
7917 const struct nlattr *attr;
7918 struct nft_table *table;
7919 struct nft_object *obj;
7920 struct nft_ctx ctx;
7921 u32 objtype;
7922
7923 if (!nla[NFTA_OBJ_TYPE] ||
7924 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7925 return -EINVAL;
7926
7927 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7928 NETLINK_CB(skb).portid);
7929 if (IS_ERR(table)) {
7930 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7931 return PTR_ERR(table);
7932 }
7933
7934 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7935 if (nla[NFTA_OBJ_HANDLE]) {
7936 attr = nla[NFTA_OBJ_HANDLE];
7937 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7938 } else {
7939 attr = nla[NFTA_OBJ_NAME];
7940 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7941 }
7942
7943 if (IS_ERR(obj)) {
7944 if (PTR_ERR(obj) == -ENOENT &&
7945 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7946 return 0;
7947
7948 NL_SET_BAD_ATTR(extack, attr);
7949 return PTR_ERR(obj);
7950 }
7951 if (obj->use > 0) {
7952 NL_SET_BAD_ATTR(extack, attr);
7953 return -EBUSY;
7954 }
7955
7956 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7957
7958 return nft_delobj(&ctx, obj);
7959 }
7960
7961 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)7962 __nft_obj_notify(struct net *net, const struct nft_table *table,
7963 struct nft_object *obj, u32 portid, u32 seq, int event,
7964 u16 flags, int family, int report, gfp_t gfp)
7965 {
7966 struct nftables_pernet *nft_net = nft_pernet(net);
7967 struct sk_buff *skb;
7968 int err;
7969
7970 if (!report &&
7971 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7972 return;
7973
7974 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7975 if (skb == NULL)
7976 goto err;
7977
7978 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7979 flags & (NLM_F_CREATE | NLM_F_EXCL),
7980 family, table, obj, false);
7981 if (err < 0) {
7982 kfree_skb(skb);
7983 goto err;
7984 }
7985
7986 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7987 return;
7988 err:
7989 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7990 }
7991
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)7992 void nft_obj_notify(struct net *net, const struct nft_table *table,
7993 struct nft_object *obj, u32 portid, u32 seq, int event,
7994 u16 flags, int family, int report, gfp_t gfp)
7995 {
7996 struct nftables_pernet *nft_net = nft_pernet(net);
7997 char *buf = kasprintf(gfp, "%s:%u",
7998 table->name, nft_net->base_seq);
7999
8000 audit_log_nfcfg(buf,
8001 family,
8002 obj->handle,
8003 event == NFT_MSG_NEWOBJ ?
8004 AUDIT_NFT_OP_OBJ_REGISTER :
8005 AUDIT_NFT_OP_OBJ_UNREGISTER,
8006 gfp);
8007 kfree(buf);
8008
8009 __nft_obj_notify(net, table, obj, portid, seq, event,
8010 flags, family, report, gfp);
8011 }
8012 EXPORT_SYMBOL_GPL(nft_obj_notify);
8013
nf_tables_obj_notify(const struct nft_ctx * ctx,struct nft_object * obj,int event)8014 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8015 struct nft_object *obj, int event)
8016 {
8017 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8018 ctx->seq, event, ctx->flags, ctx->family,
8019 ctx->report, GFP_KERNEL);
8020 }
8021
8022 /*
8023 * Flow tables
8024 */
nft_register_flowtable_type(struct nf_flowtable_type * type)8025 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8026 {
8027 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8028 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8029 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8030 }
8031 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8032
nft_unregister_flowtable_type(struct nf_flowtable_type * type)8033 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8034 {
8035 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8036 list_del_rcu(&type->list);
8037 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8038 }
8039 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8040
8041 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8042 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
8043 .len = NFT_NAME_MAXLEN - 1 },
8044 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
8045 .len = NFT_NAME_MAXLEN - 1 },
8046 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
8047 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8048 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
8049 };
8050
nft_flowtable_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8051 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8052 const struct nlattr *nla, u8 genmask)
8053 {
8054 struct nft_flowtable *flowtable;
8055
8056 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8057 if (!nla_strcmp(nla, flowtable->name) &&
8058 nft_active_genmask(flowtable, genmask))
8059 return flowtable;
8060 }
8061 return ERR_PTR(-ENOENT);
8062 }
8063 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8064
nf_tables_deactivate_flowtable(const struct nft_ctx * ctx,struct nft_flowtable * flowtable,enum nft_trans_phase phase)8065 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8066 struct nft_flowtable *flowtable,
8067 enum nft_trans_phase phase)
8068 {
8069 switch (phase) {
8070 case NFT_TRANS_PREPARE_ERROR:
8071 case NFT_TRANS_PREPARE:
8072 case NFT_TRANS_ABORT:
8073 case NFT_TRANS_RELEASE:
8074 nft_use_dec(&flowtable->use);
8075 fallthrough;
8076 default:
8077 return;
8078 }
8079 }
8080 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8081
8082 static struct nft_flowtable *
nft_flowtable_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8083 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8084 const struct nlattr *nla, u8 genmask)
8085 {
8086 struct nft_flowtable *flowtable;
8087
8088 list_for_each_entry(flowtable, &table->flowtables, list) {
8089 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8090 nft_active_genmask(flowtable, genmask))
8091 return flowtable;
8092 }
8093 return ERR_PTR(-ENOENT);
8094 }
8095
8096 struct nft_flowtable_hook {
8097 u32 num;
8098 int priority;
8099 struct list_head list;
8100 };
8101
8102 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8103 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8104 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8105 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8106 };
8107
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)8108 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8109 const struct nlattr * const nla[],
8110 struct nft_flowtable_hook *flowtable_hook,
8111 struct nft_flowtable *flowtable,
8112 struct netlink_ext_ack *extack, bool add)
8113 {
8114 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8115 struct nft_hook *hook;
8116 int hooknum, priority;
8117 int err;
8118
8119 INIT_LIST_HEAD(&flowtable_hook->list);
8120
8121 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8122 nla[NFTA_FLOWTABLE_HOOK],
8123 nft_flowtable_hook_policy, NULL);
8124 if (err < 0)
8125 return err;
8126
8127 if (add) {
8128 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8129 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8130 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8131 return -ENOENT;
8132 }
8133
8134 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8135 if (hooknum != NF_NETDEV_INGRESS)
8136 return -EOPNOTSUPP;
8137
8138 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8139
8140 flowtable_hook->priority = priority;
8141 flowtable_hook->num = hooknum;
8142 } else {
8143 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8144 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8145 if (hooknum != flowtable->hooknum)
8146 return -EOPNOTSUPP;
8147 }
8148
8149 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8150 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8151 if (priority != flowtable->data.priority)
8152 return -EOPNOTSUPP;
8153 }
8154
8155 flowtable_hook->priority = flowtable->data.priority;
8156 flowtable_hook->num = flowtable->hooknum;
8157 }
8158
8159 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8160 err = nf_tables_parse_netdev_hooks(ctx->net,
8161 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8162 &flowtable_hook->list,
8163 extack);
8164 if (err < 0)
8165 return err;
8166 }
8167
8168 list_for_each_entry(hook, &flowtable_hook->list, list) {
8169 hook->ops.pf = NFPROTO_NETDEV;
8170 hook->ops.hooknum = flowtable_hook->num;
8171 hook->ops.priority = flowtable_hook->priority;
8172 hook->ops.priv = &flowtable->data;
8173 hook->ops.hook = flowtable->data.type->hook;
8174 }
8175
8176 return err;
8177 }
8178
8179 /* call under rcu_read_lock */
__nft_flowtable_type_get(u8 family)8180 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8181 {
8182 const struct nf_flowtable_type *type;
8183
8184 list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
8185 if (family == type->family)
8186 return type;
8187 }
8188 return NULL;
8189 }
8190
8191 static const struct nf_flowtable_type *
nft_flowtable_type_get(struct net * net,u8 family)8192 nft_flowtable_type_get(struct net *net, u8 family)
8193 {
8194 const struct nf_flowtable_type *type;
8195
8196 rcu_read_lock();
8197 type = __nft_flowtable_type_get(family);
8198 if (type != NULL && try_module_get(type->owner)) {
8199 rcu_read_unlock();
8200 return type;
8201 }
8202 rcu_read_unlock();
8203
8204 lockdep_nfnl_nft_mutex_not_held();
8205 #ifdef CONFIG_MODULES
8206 if (type == NULL) {
8207 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8208 return ERR_PTR(-EAGAIN);
8209 }
8210 #endif
8211 return ERR_PTR(-ENOENT);
8212 }
8213
8214 /* Only called from error and netdev event paths. */
nft_unregister_flowtable_hook(struct net * net,struct nft_flowtable * flowtable,struct nft_hook * hook)8215 static void nft_unregister_flowtable_hook(struct net *net,
8216 struct nft_flowtable *flowtable,
8217 struct nft_hook *hook)
8218 {
8219 nf_unregister_net_hook(net, &hook->ops);
8220 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8221 FLOW_BLOCK_UNBIND);
8222 }
8223
__nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list,bool release_netdev)8224 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8225 struct list_head *hook_list,
8226 bool release_netdev)
8227 {
8228 struct nft_hook *hook, *next;
8229
8230 list_for_each_entry_safe(hook, next, hook_list, list) {
8231 nf_unregister_net_hook(net, &hook->ops);
8232 if (release_netdev) {
8233 list_del(&hook->list);
8234 kfree_rcu(hook, rcu);
8235 }
8236 }
8237 }
8238
nft_unregister_flowtable_net_hooks(struct net * net,struct list_head * hook_list)8239 static void nft_unregister_flowtable_net_hooks(struct net *net,
8240 struct list_head *hook_list)
8241 {
8242 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8243 }
8244
nft_register_flowtable_net_hooks(struct net * net,struct nft_table * table,struct list_head * hook_list,struct nft_flowtable * flowtable)8245 static int nft_register_flowtable_net_hooks(struct net *net,
8246 struct nft_table *table,
8247 struct list_head *hook_list,
8248 struct nft_flowtable *flowtable)
8249 {
8250 struct nft_hook *hook, *hook2, *next;
8251 struct nft_flowtable *ft;
8252 int err, i = 0;
8253
8254 list_for_each_entry(hook, hook_list, list) {
8255 list_for_each_entry(ft, &table->flowtables, list) {
8256 if (!nft_is_active_next(net, ft))
8257 continue;
8258
8259 list_for_each_entry(hook2, &ft->hook_list, list) {
8260 if (hook->ops.dev == hook2->ops.dev &&
8261 hook->ops.pf == hook2->ops.pf) {
8262 err = -EEXIST;
8263 goto err_unregister_net_hooks;
8264 }
8265 }
8266 }
8267
8268 err = flowtable->data.type->setup(&flowtable->data,
8269 hook->ops.dev,
8270 FLOW_BLOCK_BIND);
8271 if (err < 0)
8272 goto err_unregister_net_hooks;
8273
8274 err = nf_register_net_hook(net, &hook->ops);
8275 if (err < 0) {
8276 flowtable->data.type->setup(&flowtable->data,
8277 hook->ops.dev,
8278 FLOW_BLOCK_UNBIND);
8279 goto err_unregister_net_hooks;
8280 }
8281
8282 i++;
8283 }
8284
8285 return 0;
8286
8287 err_unregister_net_hooks:
8288 list_for_each_entry_safe(hook, next, hook_list, list) {
8289 if (i-- <= 0)
8290 break;
8291
8292 nft_unregister_flowtable_hook(net, flowtable, hook);
8293 list_del_rcu(&hook->list);
8294 kfree_rcu(hook, rcu);
8295 }
8296
8297 return err;
8298 }
8299
nft_hooks_destroy(struct list_head * hook_list)8300 static void nft_hooks_destroy(struct list_head *hook_list)
8301 {
8302 struct nft_hook *hook, *next;
8303
8304 list_for_each_entry_safe(hook, next, hook_list, list) {
8305 list_del_rcu(&hook->list);
8306 kfree_rcu(hook, rcu);
8307 }
8308 }
8309
nft_flowtable_update(struct nft_ctx * ctx,const struct nlmsghdr * nlh,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8310 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8311 struct nft_flowtable *flowtable,
8312 struct netlink_ext_ack *extack)
8313 {
8314 const struct nlattr * const *nla = ctx->nla;
8315 struct nft_flowtable_hook flowtable_hook;
8316 struct nft_hook *hook, *next;
8317 struct nft_trans *trans;
8318 bool unregister = false;
8319 u32 flags;
8320 int err;
8321
8322 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8323 extack, false);
8324 if (err < 0)
8325 return err;
8326
8327 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8328 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8329 list_del(&hook->list);
8330 kfree(hook);
8331 }
8332 }
8333
8334 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8335 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8336 if (flags & ~NFT_FLOWTABLE_MASK) {
8337 err = -EOPNOTSUPP;
8338 goto err_flowtable_update_hook;
8339 }
8340 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8341 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8342 err = -EOPNOTSUPP;
8343 goto err_flowtable_update_hook;
8344 }
8345 } else {
8346 flags = flowtable->data.flags;
8347 }
8348
8349 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8350 &flowtable_hook.list, flowtable);
8351 if (err < 0)
8352 goto err_flowtable_update_hook;
8353
8354 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8355 sizeof(struct nft_trans_flowtable));
8356 if (!trans) {
8357 unregister = true;
8358 err = -ENOMEM;
8359 goto err_flowtable_update_hook;
8360 }
8361
8362 nft_trans_flowtable_flags(trans) = flags;
8363 nft_trans_flowtable(trans) = flowtable;
8364 nft_trans_flowtable_update(trans) = true;
8365 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8366 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8367
8368 nft_trans_commit_list_add_tail(ctx->net, trans);
8369
8370 return 0;
8371
8372 err_flowtable_update_hook:
8373 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8374 if (unregister)
8375 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8376 list_del_rcu(&hook->list);
8377 kfree_rcu(hook, rcu);
8378 }
8379
8380 return err;
8381
8382 }
8383
nf_tables_newflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8384 static int nf_tables_newflowtable(struct sk_buff *skb,
8385 const struct nfnl_info *info,
8386 const struct nlattr * const nla[])
8387 {
8388 struct netlink_ext_ack *extack = info->extack;
8389 struct nft_flowtable_hook flowtable_hook;
8390 u8 genmask = nft_genmask_next(info->net);
8391 u8 family = info->nfmsg->nfgen_family;
8392 const struct nf_flowtable_type *type;
8393 struct nft_flowtable *flowtable;
8394 struct net *net = info->net;
8395 struct nft_table *table;
8396 struct nft_trans *trans;
8397 struct nft_ctx ctx;
8398 int err;
8399
8400 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8401 !nla[NFTA_FLOWTABLE_NAME] ||
8402 !nla[NFTA_FLOWTABLE_HOOK])
8403 return -EINVAL;
8404
8405 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8406 genmask, NETLINK_CB(skb).portid);
8407 if (IS_ERR(table)) {
8408 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8409 return PTR_ERR(table);
8410 }
8411
8412 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8413 genmask);
8414 if (IS_ERR(flowtable)) {
8415 err = PTR_ERR(flowtable);
8416 if (err != -ENOENT) {
8417 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8418 return err;
8419 }
8420 } else {
8421 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8422 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8423 return -EEXIST;
8424 }
8425
8426 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8427
8428 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8429 }
8430
8431 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8432
8433 if (!nft_use_inc(&table->use))
8434 return -EMFILE;
8435
8436 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8437 if (!flowtable) {
8438 err = -ENOMEM;
8439 goto flowtable_alloc;
8440 }
8441
8442 flowtable->table = table;
8443 flowtable->handle = nf_tables_alloc_handle(table);
8444 INIT_LIST_HEAD(&flowtable->hook_list);
8445
8446 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8447 if (!flowtable->name) {
8448 err = -ENOMEM;
8449 goto err1;
8450 }
8451
8452 type = nft_flowtable_type_get(net, family);
8453 if (IS_ERR(type)) {
8454 err = PTR_ERR(type);
8455 goto err2;
8456 }
8457
8458 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8459 flowtable->data.flags =
8460 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8461 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8462 err = -EOPNOTSUPP;
8463 goto err3;
8464 }
8465 }
8466
8467 write_pnet(&flowtable->data.net, net);
8468 flowtable->data.type = type;
8469 err = type->init(&flowtable->data);
8470 if (err < 0)
8471 goto err3;
8472
8473 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8474 extack, true);
8475 if (err < 0)
8476 goto err_flowtable_parse_hooks;
8477
8478 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8479 flowtable->data.priority = flowtable_hook.priority;
8480 flowtable->hooknum = flowtable_hook.num;
8481
8482 trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8483 if (IS_ERR(trans)) {
8484 err = PTR_ERR(trans);
8485 goto err_flowtable_trans;
8486 }
8487
8488 /* This must be LAST to ensure no packets are walking over this flowtable. */
8489 err = nft_register_flowtable_net_hooks(ctx.net, table,
8490 &flowtable->hook_list,
8491 flowtable);
8492 if (err < 0)
8493 goto err_flowtable_hooks;
8494
8495 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8496
8497 return 0;
8498
8499 err_flowtable_hooks:
8500 nft_trans_destroy(trans);
8501 err_flowtable_trans:
8502 nft_hooks_destroy(&flowtable->hook_list);
8503 err_flowtable_parse_hooks:
8504 flowtable->data.type->free(&flowtable->data);
8505 err3:
8506 module_put(type->owner);
8507 err2:
8508 kfree(flowtable->name);
8509 err1:
8510 kfree(flowtable);
8511 flowtable_alloc:
8512 nft_use_dec_restore(&table->use);
8513
8514 return err;
8515 }
8516
nft_flowtable_hook_release(struct nft_flowtable_hook * flowtable_hook)8517 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8518 {
8519 struct nft_hook *this, *next;
8520
8521 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8522 list_del(&this->list);
8523 kfree(this);
8524 }
8525 }
8526
nft_delflowtable_hook(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8527 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8528 struct nft_flowtable *flowtable,
8529 struct netlink_ext_ack *extack)
8530 {
8531 const struct nlattr * const *nla = ctx->nla;
8532 struct nft_flowtable_hook flowtable_hook;
8533 LIST_HEAD(flowtable_del_list);
8534 struct nft_hook *this, *hook;
8535 struct nft_trans *trans;
8536 int err;
8537
8538 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8539 extack, false);
8540 if (err < 0)
8541 return err;
8542
8543 list_for_each_entry(this, &flowtable_hook.list, list) {
8544 hook = nft_hook_list_find(&flowtable->hook_list, this);
8545 if (!hook) {
8546 err = -ENOENT;
8547 goto err_flowtable_del_hook;
8548 }
8549 list_move(&hook->list, &flowtable_del_list);
8550 }
8551
8552 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8553 sizeof(struct nft_trans_flowtable));
8554 if (!trans) {
8555 err = -ENOMEM;
8556 goto err_flowtable_del_hook;
8557 }
8558
8559 nft_trans_flowtable(trans) = flowtable;
8560 nft_trans_flowtable_update(trans) = true;
8561 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8562 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8563 nft_flowtable_hook_release(&flowtable_hook);
8564
8565 nft_trans_commit_list_add_tail(ctx->net, trans);
8566
8567 return 0;
8568
8569 err_flowtable_del_hook:
8570 list_splice(&flowtable_del_list, &flowtable->hook_list);
8571 nft_flowtable_hook_release(&flowtable_hook);
8572
8573 return err;
8574 }
8575
nf_tables_delflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8576 static int nf_tables_delflowtable(struct sk_buff *skb,
8577 const struct nfnl_info *info,
8578 const struct nlattr * const nla[])
8579 {
8580 struct netlink_ext_ack *extack = info->extack;
8581 u8 genmask = nft_genmask_next(info->net);
8582 u8 family = info->nfmsg->nfgen_family;
8583 struct nft_flowtable *flowtable;
8584 struct net *net = info->net;
8585 const struct nlattr *attr;
8586 struct nft_table *table;
8587 struct nft_ctx ctx;
8588
8589 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8590 (!nla[NFTA_FLOWTABLE_NAME] &&
8591 !nla[NFTA_FLOWTABLE_HANDLE]))
8592 return -EINVAL;
8593
8594 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8595 genmask, NETLINK_CB(skb).portid);
8596 if (IS_ERR(table)) {
8597 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8598 return PTR_ERR(table);
8599 }
8600
8601 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8602 attr = nla[NFTA_FLOWTABLE_HANDLE];
8603 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8604 } else {
8605 attr = nla[NFTA_FLOWTABLE_NAME];
8606 flowtable = nft_flowtable_lookup(table, attr, genmask);
8607 }
8608
8609 if (IS_ERR(flowtable)) {
8610 if (PTR_ERR(flowtable) == -ENOENT &&
8611 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8612 return 0;
8613
8614 NL_SET_BAD_ATTR(extack, attr);
8615 return PTR_ERR(flowtable);
8616 }
8617
8618 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8619
8620 if (nla[NFTA_FLOWTABLE_HOOK])
8621 return nft_delflowtable_hook(&ctx, flowtable, extack);
8622
8623 if (flowtable->use > 0) {
8624 NL_SET_BAD_ATTR(extack, attr);
8625 return -EBUSY;
8626 }
8627
8628 return nft_delflowtable(&ctx, flowtable);
8629 }
8630
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)8631 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8632 u32 portid, u32 seq, int event,
8633 u32 flags, int family,
8634 struct nft_flowtable *flowtable,
8635 struct list_head *hook_list)
8636 {
8637 struct nlattr *nest, *nest_devs;
8638 struct nft_hook *hook;
8639 struct nlmsghdr *nlh;
8640
8641 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8642 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8643 NFNETLINK_V0, nft_base_seq(net));
8644 if (!nlh)
8645 goto nla_put_failure;
8646
8647 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8648 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8649 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8650 NFTA_FLOWTABLE_PAD))
8651 goto nla_put_failure;
8652
8653 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8654 nlmsg_end(skb, nlh);
8655 return 0;
8656 }
8657
8658 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8659 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8660 goto nla_put_failure;
8661
8662 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8663 if (!nest)
8664 goto nla_put_failure;
8665 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8666 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8667 goto nla_put_failure;
8668
8669 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8670 if (!nest_devs)
8671 goto nla_put_failure;
8672
8673 if (!hook_list)
8674 hook_list = &flowtable->hook_list;
8675
8676 list_for_each_entry_rcu(hook, hook_list, list) {
8677 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8678 goto nla_put_failure;
8679 }
8680 nla_nest_end(skb, nest_devs);
8681 nla_nest_end(skb, nest);
8682
8683 nlmsg_end(skb, nlh);
8684 return 0;
8685
8686 nla_put_failure:
8687 nlmsg_trim(skb, nlh);
8688 return -1;
8689 }
8690
8691 struct nft_flowtable_filter {
8692 char *table;
8693 };
8694
nf_tables_dump_flowtable(struct sk_buff * skb,struct netlink_callback * cb)8695 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8696 struct netlink_callback *cb)
8697 {
8698 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8699 struct nft_flowtable_filter *filter = cb->data;
8700 unsigned int idx = 0, s_idx = cb->args[0];
8701 struct net *net = sock_net(skb->sk);
8702 int family = nfmsg->nfgen_family;
8703 struct nft_flowtable *flowtable;
8704 struct nftables_pernet *nft_net;
8705 const struct nft_table *table;
8706
8707 rcu_read_lock();
8708 nft_net = nft_pernet(net);
8709 cb->seq = READ_ONCE(nft_net->base_seq);
8710
8711 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8712 if (family != NFPROTO_UNSPEC && family != table->family)
8713 continue;
8714
8715 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8716 if (!nft_is_active(net, flowtable))
8717 goto cont;
8718 if (idx < s_idx)
8719 goto cont;
8720 if (idx > s_idx)
8721 memset(&cb->args[1], 0,
8722 sizeof(cb->args) - sizeof(cb->args[0]));
8723 if (filter && filter->table &&
8724 strcmp(filter->table, table->name))
8725 goto cont;
8726
8727 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8728 cb->nlh->nlmsg_seq,
8729 NFT_MSG_NEWFLOWTABLE,
8730 NLM_F_MULTI | NLM_F_APPEND,
8731 table->family,
8732 flowtable, NULL) < 0)
8733 goto done;
8734
8735 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8736 cont:
8737 idx++;
8738 }
8739 }
8740 done:
8741 rcu_read_unlock();
8742
8743 cb->args[0] = idx;
8744 return skb->len;
8745 }
8746
nf_tables_dump_flowtable_start(struct netlink_callback * cb)8747 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8748 {
8749 const struct nlattr * const *nla = cb->data;
8750 struct nft_flowtable_filter *filter = NULL;
8751
8752 if (nla[NFTA_FLOWTABLE_TABLE]) {
8753 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8754 if (!filter)
8755 return -ENOMEM;
8756
8757 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8758 GFP_ATOMIC);
8759 if (!filter->table) {
8760 kfree(filter);
8761 return -ENOMEM;
8762 }
8763 }
8764
8765 cb->data = filter;
8766 return 0;
8767 }
8768
nf_tables_dump_flowtable_done(struct netlink_callback * cb)8769 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8770 {
8771 struct nft_flowtable_filter *filter = cb->data;
8772
8773 if (!filter)
8774 return 0;
8775
8776 kfree(filter->table);
8777 kfree(filter);
8778
8779 return 0;
8780 }
8781
8782 /* called with rcu_read_lock held */
nf_tables_getflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8783 static int nf_tables_getflowtable(struct sk_buff *skb,
8784 const struct nfnl_info *info,
8785 const struct nlattr * const nla[])
8786 {
8787 u8 genmask = nft_genmask_cur(info->net);
8788 u8 family = info->nfmsg->nfgen_family;
8789 struct nft_flowtable *flowtable;
8790 const struct nft_table *table;
8791 struct net *net = info->net;
8792 struct sk_buff *skb2;
8793 int err;
8794
8795 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8796 struct netlink_dump_control c = {
8797 .start = nf_tables_dump_flowtable_start,
8798 .dump = nf_tables_dump_flowtable,
8799 .done = nf_tables_dump_flowtable_done,
8800 .module = THIS_MODULE,
8801 .data = (void *)nla,
8802 };
8803
8804 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8805 }
8806
8807 if (!nla[NFTA_FLOWTABLE_NAME])
8808 return -EINVAL;
8809
8810 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8811 genmask, 0);
8812 if (IS_ERR(table))
8813 return PTR_ERR(table);
8814
8815 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8816 genmask);
8817 if (IS_ERR(flowtable))
8818 return PTR_ERR(flowtable);
8819
8820 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8821 if (!skb2)
8822 return -ENOMEM;
8823
8824 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8825 info->nlh->nlmsg_seq,
8826 NFT_MSG_NEWFLOWTABLE, 0, family,
8827 flowtable, NULL);
8828 if (err < 0)
8829 goto err_fill_flowtable_info;
8830
8831 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8832
8833 err_fill_flowtable_info:
8834 kfree_skb(skb2);
8835 return err;
8836 }
8837
nf_tables_flowtable_notify(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct list_head * hook_list,int event)8838 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8839 struct nft_flowtable *flowtable,
8840 struct list_head *hook_list, int event)
8841 {
8842 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8843 struct sk_buff *skb;
8844 u16 flags = 0;
8845 int err;
8846
8847 if (!ctx->report &&
8848 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8849 return;
8850
8851 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8852 if (skb == NULL)
8853 goto err;
8854
8855 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8856 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8857
8858 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8859 ctx->seq, event, flags,
8860 ctx->family, flowtable, hook_list);
8861 if (err < 0) {
8862 kfree_skb(skb);
8863 goto err;
8864 }
8865
8866 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8867 return;
8868 err:
8869 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8870 }
8871
nf_tables_flowtable_destroy(struct nft_flowtable * flowtable)8872 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8873 {
8874 struct nft_hook *hook, *next;
8875
8876 flowtable->data.type->free(&flowtable->data);
8877 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8878 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8879 FLOW_BLOCK_UNBIND);
8880 list_del_rcu(&hook->list);
8881 kfree(hook);
8882 }
8883 kfree(flowtable->name);
8884 module_put(flowtable->data.type->owner);
8885 kfree(flowtable);
8886 }
8887
nf_tables_fill_gen_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq)8888 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8889 u32 portid, u32 seq)
8890 {
8891 struct nftables_pernet *nft_net = nft_pernet(net);
8892 struct nlmsghdr *nlh;
8893 char buf[TASK_COMM_LEN];
8894 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8895
8896 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8897 NFNETLINK_V0, nft_base_seq(net));
8898 if (!nlh)
8899 goto nla_put_failure;
8900
8901 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8902 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8903 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8904 goto nla_put_failure;
8905
8906 nlmsg_end(skb, nlh);
8907 return 0;
8908
8909 nla_put_failure:
8910 nlmsg_trim(skb, nlh);
8911 return -EMSGSIZE;
8912 }
8913
nft_flowtable_event(unsigned long event,struct net_device * dev,struct nft_flowtable * flowtable)8914 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8915 struct nft_flowtable *flowtable)
8916 {
8917 struct nft_hook *hook;
8918
8919 list_for_each_entry(hook, &flowtable->hook_list, list) {
8920 if (hook->ops.dev != dev)
8921 continue;
8922
8923 /* flow_offload_netdev_event() cleans up entries for us. */
8924 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8925 list_del_rcu(&hook->list);
8926 kfree_rcu(hook, rcu);
8927 break;
8928 }
8929 }
8930
nf_tables_flowtable_event(struct notifier_block * this,unsigned long event,void * ptr)8931 static int nf_tables_flowtable_event(struct notifier_block *this,
8932 unsigned long event, void *ptr)
8933 {
8934 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8935 struct nft_flowtable *flowtable;
8936 struct nftables_pernet *nft_net;
8937 struct nft_table *table;
8938 struct net *net;
8939
8940 if (event != NETDEV_UNREGISTER)
8941 return 0;
8942
8943 net = dev_net(dev);
8944 nft_net = nft_pernet(net);
8945 mutex_lock(&nft_net->commit_mutex);
8946 list_for_each_entry(table, &nft_net->tables, list) {
8947 list_for_each_entry(flowtable, &table->flowtables, list) {
8948 nft_flowtable_event(event, dev, flowtable);
8949 }
8950 }
8951 mutex_unlock(&nft_net->commit_mutex);
8952
8953 return NOTIFY_DONE;
8954 }
8955
8956 static struct notifier_block nf_tables_flowtable_notifier = {
8957 .notifier_call = nf_tables_flowtable_event,
8958 };
8959
nf_tables_gen_notify(struct net * net,struct sk_buff * skb,int event)8960 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8961 int event)
8962 {
8963 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8964 struct sk_buff *skb2;
8965 int err;
8966
8967 if (!nlmsg_report(nlh) &&
8968 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8969 return;
8970
8971 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8972 if (skb2 == NULL)
8973 goto err;
8974
8975 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8976 nlh->nlmsg_seq);
8977 if (err < 0) {
8978 kfree_skb(skb2);
8979 goto err;
8980 }
8981
8982 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8983 nlmsg_report(nlh), GFP_KERNEL);
8984 return;
8985 err:
8986 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8987 -ENOBUFS);
8988 }
8989
nf_tables_getgen(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8990 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8991 const struct nlattr * const nla[])
8992 {
8993 struct sk_buff *skb2;
8994 int err;
8995
8996 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8997 if (skb2 == NULL)
8998 return -ENOMEM;
8999
9000 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9001 info->nlh->nlmsg_seq);
9002 if (err < 0)
9003 goto err_fill_gen_info;
9004
9005 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9006
9007 err_fill_gen_info:
9008 kfree_skb(skb2);
9009 return err;
9010 }
9011
9012 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9013 [NFT_MSG_NEWTABLE] = {
9014 .call = nf_tables_newtable,
9015 .type = NFNL_CB_BATCH,
9016 .attr_count = NFTA_TABLE_MAX,
9017 .policy = nft_table_policy,
9018 },
9019 [NFT_MSG_GETTABLE] = {
9020 .call = nf_tables_gettable,
9021 .type = NFNL_CB_RCU,
9022 .attr_count = NFTA_TABLE_MAX,
9023 .policy = nft_table_policy,
9024 },
9025 [NFT_MSG_DELTABLE] = {
9026 .call = nf_tables_deltable,
9027 .type = NFNL_CB_BATCH,
9028 .attr_count = NFTA_TABLE_MAX,
9029 .policy = nft_table_policy,
9030 },
9031 [NFT_MSG_DESTROYTABLE] = {
9032 .call = nf_tables_deltable,
9033 .type = NFNL_CB_BATCH,
9034 .attr_count = NFTA_TABLE_MAX,
9035 .policy = nft_table_policy,
9036 },
9037 [NFT_MSG_NEWCHAIN] = {
9038 .call = nf_tables_newchain,
9039 .type = NFNL_CB_BATCH,
9040 .attr_count = NFTA_CHAIN_MAX,
9041 .policy = nft_chain_policy,
9042 },
9043 [NFT_MSG_GETCHAIN] = {
9044 .call = nf_tables_getchain,
9045 .type = NFNL_CB_RCU,
9046 .attr_count = NFTA_CHAIN_MAX,
9047 .policy = nft_chain_policy,
9048 },
9049 [NFT_MSG_DELCHAIN] = {
9050 .call = nf_tables_delchain,
9051 .type = NFNL_CB_BATCH,
9052 .attr_count = NFTA_CHAIN_MAX,
9053 .policy = nft_chain_policy,
9054 },
9055 [NFT_MSG_DESTROYCHAIN] = {
9056 .call = nf_tables_delchain,
9057 .type = NFNL_CB_BATCH,
9058 .attr_count = NFTA_CHAIN_MAX,
9059 .policy = nft_chain_policy,
9060 },
9061 [NFT_MSG_NEWRULE] = {
9062 .call = nf_tables_newrule,
9063 .type = NFNL_CB_BATCH,
9064 .attr_count = NFTA_RULE_MAX,
9065 .policy = nft_rule_policy,
9066 },
9067 [NFT_MSG_GETRULE] = {
9068 .call = nf_tables_getrule,
9069 .type = NFNL_CB_RCU,
9070 .attr_count = NFTA_RULE_MAX,
9071 .policy = nft_rule_policy,
9072 },
9073 [NFT_MSG_GETRULE_RESET] = {
9074 .call = nf_tables_getrule,
9075 .type = NFNL_CB_RCU,
9076 .attr_count = NFTA_RULE_MAX,
9077 .policy = nft_rule_policy,
9078 },
9079 [NFT_MSG_DELRULE] = {
9080 .call = nf_tables_delrule,
9081 .type = NFNL_CB_BATCH,
9082 .attr_count = NFTA_RULE_MAX,
9083 .policy = nft_rule_policy,
9084 },
9085 [NFT_MSG_DESTROYRULE] = {
9086 .call = nf_tables_delrule,
9087 .type = NFNL_CB_BATCH,
9088 .attr_count = NFTA_RULE_MAX,
9089 .policy = nft_rule_policy,
9090 },
9091 [NFT_MSG_NEWSET] = {
9092 .call = nf_tables_newset,
9093 .type = NFNL_CB_BATCH,
9094 .attr_count = NFTA_SET_MAX,
9095 .policy = nft_set_policy,
9096 },
9097 [NFT_MSG_GETSET] = {
9098 .call = nf_tables_getset,
9099 .type = NFNL_CB_RCU,
9100 .attr_count = NFTA_SET_MAX,
9101 .policy = nft_set_policy,
9102 },
9103 [NFT_MSG_DELSET] = {
9104 .call = nf_tables_delset,
9105 .type = NFNL_CB_BATCH,
9106 .attr_count = NFTA_SET_MAX,
9107 .policy = nft_set_policy,
9108 },
9109 [NFT_MSG_DESTROYSET] = {
9110 .call = nf_tables_delset,
9111 .type = NFNL_CB_BATCH,
9112 .attr_count = NFTA_SET_MAX,
9113 .policy = nft_set_policy,
9114 },
9115 [NFT_MSG_NEWSETELEM] = {
9116 .call = nf_tables_newsetelem,
9117 .type = NFNL_CB_BATCH,
9118 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9119 .policy = nft_set_elem_list_policy,
9120 },
9121 [NFT_MSG_GETSETELEM] = {
9122 .call = nf_tables_getsetelem,
9123 .type = NFNL_CB_RCU,
9124 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9125 .policy = nft_set_elem_list_policy,
9126 },
9127 [NFT_MSG_GETSETELEM_RESET] = {
9128 .call = nf_tables_getsetelem,
9129 .type = NFNL_CB_RCU,
9130 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9131 .policy = nft_set_elem_list_policy,
9132 },
9133 [NFT_MSG_DELSETELEM] = {
9134 .call = nf_tables_delsetelem,
9135 .type = NFNL_CB_BATCH,
9136 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9137 .policy = nft_set_elem_list_policy,
9138 },
9139 [NFT_MSG_DESTROYSETELEM] = {
9140 .call = nf_tables_delsetelem,
9141 .type = NFNL_CB_BATCH,
9142 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9143 .policy = nft_set_elem_list_policy,
9144 },
9145 [NFT_MSG_GETGEN] = {
9146 .call = nf_tables_getgen,
9147 .type = NFNL_CB_RCU,
9148 },
9149 [NFT_MSG_NEWOBJ] = {
9150 .call = nf_tables_newobj,
9151 .type = NFNL_CB_BATCH,
9152 .attr_count = NFTA_OBJ_MAX,
9153 .policy = nft_obj_policy,
9154 },
9155 [NFT_MSG_GETOBJ] = {
9156 .call = nf_tables_getobj,
9157 .type = NFNL_CB_RCU,
9158 .attr_count = NFTA_OBJ_MAX,
9159 .policy = nft_obj_policy,
9160 },
9161 [NFT_MSG_DELOBJ] = {
9162 .call = nf_tables_delobj,
9163 .type = NFNL_CB_BATCH,
9164 .attr_count = NFTA_OBJ_MAX,
9165 .policy = nft_obj_policy,
9166 },
9167 [NFT_MSG_DESTROYOBJ] = {
9168 .call = nf_tables_delobj,
9169 .type = NFNL_CB_BATCH,
9170 .attr_count = NFTA_OBJ_MAX,
9171 .policy = nft_obj_policy,
9172 },
9173 [NFT_MSG_GETOBJ_RESET] = {
9174 .call = nf_tables_getobj,
9175 .type = NFNL_CB_RCU,
9176 .attr_count = NFTA_OBJ_MAX,
9177 .policy = nft_obj_policy,
9178 },
9179 [NFT_MSG_NEWFLOWTABLE] = {
9180 .call = nf_tables_newflowtable,
9181 .type = NFNL_CB_BATCH,
9182 .attr_count = NFTA_FLOWTABLE_MAX,
9183 .policy = nft_flowtable_policy,
9184 },
9185 [NFT_MSG_GETFLOWTABLE] = {
9186 .call = nf_tables_getflowtable,
9187 .type = NFNL_CB_RCU,
9188 .attr_count = NFTA_FLOWTABLE_MAX,
9189 .policy = nft_flowtable_policy,
9190 },
9191 [NFT_MSG_DELFLOWTABLE] = {
9192 .call = nf_tables_delflowtable,
9193 .type = NFNL_CB_BATCH,
9194 .attr_count = NFTA_FLOWTABLE_MAX,
9195 .policy = nft_flowtable_policy,
9196 },
9197 [NFT_MSG_DESTROYFLOWTABLE] = {
9198 .call = nf_tables_delflowtable,
9199 .type = NFNL_CB_BATCH,
9200 .attr_count = NFTA_FLOWTABLE_MAX,
9201 .policy = nft_flowtable_policy,
9202 },
9203 };
9204
nf_tables_validate(struct net * net)9205 static int nf_tables_validate(struct net *net)
9206 {
9207 struct nftables_pernet *nft_net = nft_pernet(net);
9208 struct nft_table *table;
9209
9210 list_for_each_entry(table, &nft_net->tables, list) {
9211 switch (table->validate_state) {
9212 case NFT_VALIDATE_SKIP:
9213 continue;
9214 case NFT_VALIDATE_NEED:
9215 nft_validate_state_update(table, NFT_VALIDATE_DO);
9216 fallthrough;
9217 case NFT_VALIDATE_DO:
9218 if (nft_table_validate(net, table) < 0)
9219 return -EAGAIN;
9220
9221 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9222 break;
9223 }
9224 }
9225
9226 return 0;
9227 }
9228
9229 /* a drop policy has to be deferred until all rules have been activated,
9230 * otherwise a large ruleset that contains a drop-policy base chain will
9231 * cause all packets to get dropped until the full transaction has been
9232 * processed.
9233 *
9234 * We defer the drop policy until the transaction has been finalized.
9235 */
nft_chain_commit_drop_policy(struct nft_trans * trans)9236 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9237 {
9238 struct nft_base_chain *basechain;
9239
9240 if (nft_trans_chain_policy(trans) != NF_DROP)
9241 return;
9242
9243 if (!nft_is_base_chain(trans->ctx.chain))
9244 return;
9245
9246 basechain = nft_base_chain(trans->ctx.chain);
9247 basechain->policy = NF_DROP;
9248 }
9249
nft_chain_commit_update(struct nft_trans * trans)9250 static void nft_chain_commit_update(struct nft_trans *trans)
9251 {
9252 struct nft_base_chain *basechain;
9253
9254 if (nft_trans_chain_name(trans)) {
9255 rhltable_remove(&trans->ctx.table->chains_ht,
9256 &trans->ctx.chain->rhlhead,
9257 nft_chain_ht_params);
9258 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9259 rhltable_insert_key(&trans->ctx.table->chains_ht,
9260 trans->ctx.chain->name,
9261 &trans->ctx.chain->rhlhead,
9262 nft_chain_ht_params);
9263 }
9264
9265 if (!nft_is_base_chain(trans->ctx.chain))
9266 return;
9267
9268 nft_chain_stats_replace(trans);
9269
9270 basechain = nft_base_chain(trans->ctx.chain);
9271
9272 switch (nft_trans_chain_policy(trans)) {
9273 case NF_DROP:
9274 case NF_ACCEPT:
9275 basechain->policy = nft_trans_chain_policy(trans);
9276 break;
9277 }
9278 }
9279
nft_obj_commit_update(struct nft_trans * trans)9280 static void nft_obj_commit_update(struct nft_trans *trans)
9281 {
9282 struct nft_object *newobj;
9283 struct nft_object *obj;
9284
9285 obj = nft_trans_obj(trans);
9286 newobj = nft_trans_obj_newobj(trans);
9287
9288 if (obj->ops->update)
9289 obj->ops->update(obj, newobj);
9290
9291 nft_obj_destroy(&trans->ctx, newobj);
9292 }
9293
nft_commit_release(struct nft_trans * trans)9294 static void nft_commit_release(struct nft_trans *trans)
9295 {
9296 switch (trans->msg_type) {
9297 case NFT_MSG_DELTABLE:
9298 case NFT_MSG_DESTROYTABLE:
9299 nf_tables_table_destroy(&trans->ctx);
9300 break;
9301 case NFT_MSG_NEWCHAIN:
9302 free_percpu(nft_trans_chain_stats(trans));
9303 kfree(nft_trans_chain_name(trans));
9304 break;
9305 case NFT_MSG_DELCHAIN:
9306 case NFT_MSG_DESTROYCHAIN:
9307 if (nft_trans_chain_update(trans))
9308 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9309 else
9310 nf_tables_chain_destroy(&trans->ctx);
9311 break;
9312 case NFT_MSG_DELRULE:
9313 case NFT_MSG_DESTROYRULE:
9314 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9315 break;
9316 case NFT_MSG_DELSET:
9317 case NFT_MSG_DESTROYSET:
9318 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9319 break;
9320 case NFT_MSG_DELSETELEM:
9321 case NFT_MSG_DESTROYSETELEM:
9322 nf_tables_set_elem_destroy(&trans->ctx,
9323 nft_trans_elem_set(trans),
9324 nft_trans_elem(trans).priv);
9325 break;
9326 case NFT_MSG_DELOBJ:
9327 case NFT_MSG_DESTROYOBJ:
9328 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9329 break;
9330 case NFT_MSG_DELFLOWTABLE:
9331 case NFT_MSG_DESTROYFLOWTABLE:
9332 if (nft_trans_flowtable_update(trans))
9333 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9334 else
9335 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9336 break;
9337 }
9338
9339 if (trans->put_net)
9340 put_net(trans->ctx.net);
9341
9342 kfree(trans);
9343 }
9344
nf_tables_trans_destroy_work(struct work_struct * w)9345 static void nf_tables_trans_destroy_work(struct work_struct *w)
9346 {
9347 struct nft_trans *trans, *next;
9348 LIST_HEAD(head);
9349
9350 spin_lock(&nf_tables_destroy_list_lock);
9351 list_splice_init(&nf_tables_destroy_list, &head);
9352 spin_unlock(&nf_tables_destroy_list_lock);
9353
9354 if (list_empty(&head))
9355 return;
9356
9357 synchronize_rcu();
9358
9359 list_for_each_entry_safe(trans, next, &head, list) {
9360 nft_trans_list_del(trans);
9361 nft_commit_release(trans);
9362 }
9363 }
9364
nf_tables_trans_destroy_flush_work(void)9365 void nf_tables_trans_destroy_flush_work(void)
9366 {
9367 flush_work(&trans_destroy_work);
9368 }
9369 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9370
nft_expr_reduce(struct nft_regs_track * track,const struct nft_expr * expr)9371 static bool nft_expr_reduce(struct nft_regs_track *track,
9372 const struct nft_expr *expr)
9373 {
9374 return false;
9375 }
9376
nf_tables_commit_chain_prepare(struct net * net,struct nft_chain * chain)9377 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9378 {
9379 const struct nft_expr *expr, *last;
9380 struct nft_regs_track track = {};
9381 unsigned int size, data_size;
9382 void *data, *data_boundary;
9383 struct nft_rule_dp *prule;
9384 struct nft_rule *rule;
9385
9386 /* already handled or inactive chain? */
9387 if (chain->blob_next || !nft_is_active_next(net, chain))
9388 return 0;
9389
9390 data_size = 0;
9391 list_for_each_entry(rule, &chain->rules, list) {
9392 if (nft_is_active_next(net, rule)) {
9393 data_size += sizeof(*prule) + rule->dlen;
9394 if (data_size > INT_MAX)
9395 return -ENOMEM;
9396 }
9397 }
9398
9399 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9400 if (!chain->blob_next)
9401 return -ENOMEM;
9402
9403 data = (void *)chain->blob_next->data;
9404 data_boundary = data + data_size;
9405 size = 0;
9406
9407 list_for_each_entry(rule, &chain->rules, list) {
9408 if (!nft_is_active_next(net, rule))
9409 continue;
9410
9411 prule = (struct nft_rule_dp *)data;
9412 data += offsetof(struct nft_rule_dp, data);
9413 if (WARN_ON_ONCE(data > data_boundary))
9414 return -ENOMEM;
9415
9416 size = 0;
9417 track.last = nft_expr_last(rule);
9418 nft_rule_for_each_expr(expr, last, rule) {
9419 track.cur = expr;
9420
9421 if (nft_expr_reduce(&track, expr)) {
9422 expr = track.cur;
9423 continue;
9424 }
9425
9426 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9427 return -ENOMEM;
9428
9429 memcpy(data + size, expr, expr->ops->size);
9430 size += expr->ops->size;
9431 }
9432 if (WARN_ON_ONCE(size >= 1 << 12))
9433 return -ENOMEM;
9434
9435 prule->handle = rule->handle;
9436 prule->dlen = size;
9437 prule->is_last = 0;
9438
9439 data += size;
9440 size = 0;
9441 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9442 }
9443
9444 if (WARN_ON_ONCE(data > data_boundary))
9445 return -ENOMEM;
9446
9447 prule = (struct nft_rule_dp *)data;
9448 nft_last_rule(chain, prule);
9449
9450 return 0;
9451 }
9452
nf_tables_commit_chain_prepare_cancel(struct net * net)9453 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9454 {
9455 struct nftables_pernet *nft_net = nft_pernet(net);
9456 struct nft_trans *trans, *next;
9457
9458 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9459 struct nft_chain *chain = trans->ctx.chain;
9460
9461 if (trans->msg_type == NFT_MSG_NEWRULE ||
9462 trans->msg_type == NFT_MSG_DELRULE) {
9463 kvfree(chain->blob_next);
9464 chain->blob_next = NULL;
9465 }
9466 }
9467 }
9468
__nf_tables_commit_chain_free_rules(struct rcu_head * h)9469 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9470 {
9471 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9472
9473 kvfree(l->blob);
9474 }
9475
nf_tables_commit_chain_free_rules_old(struct nft_rule_blob * blob)9476 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9477 {
9478 struct nft_rule_dp_last *last;
9479
9480 /* last rule trailer is after end marker */
9481 last = (void *)blob + sizeof(*blob) + blob->size;
9482 last->blob = blob;
9483
9484 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9485 }
9486
nf_tables_commit_chain(struct net * net,struct nft_chain * chain)9487 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9488 {
9489 struct nft_rule_blob *g0, *g1;
9490 bool next_genbit;
9491
9492 next_genbit = nft_gencursor_next(net);
9493
9494 g0 = rcu_dereference_protected(chain->blob_gen_0,
9495 lockdep_commit_lock_is_held(net));
9496 g1 = rcu_dereference_protected(chain->blob_gen_1,
9497 lockdep_commit_lock_is_held(net));
9498
9499 /* No changes to this chain? */
9500 if (chain->blob_next == NULL) {
9501 /* chain had no change in last or next generation */
9502 if (g0 == g1)
9503 return;
9504 /*
9505 * chain had no change in this generation; make sure next
9506 * one uses same rules as current generation.
9507 */
9508 if (next_genbit) {
9509 rcu_assign_pointer(chain->blob_gen_1, g0);
9510 nf_tables_commit_chain_free_rules_old(g1);
9511 } else {
9512 rcu_assign_pointer(chain->blob_gen_0, g1);
9513 nf_tables_commit_chain_free_rules_old(g0);
9514 }
9515
9516 return;
9517 }
9518
9519 if (next_genbit)
9520 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9521 else
9522 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9523
9524 chain->blob_next = NULL;
9525
9526 if (g0 == g1)
9527 return;
9528
9529 if (next_genbit)
9530 nf_tables_commit_chain_free_rules_old(g1);
9531 else
9532 nf_tables_commit_chain_free_rules_old(g0);
9533 }
9534
nft_obj_del(struct nft_object * obj)9535 static void nft_obj_del(struct nft_object *obj)
9536 {
9537 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9538 list_del_rcu(&obj->list);
9539 }
9540
nft_chain_del(struct nft_chain * chain)9541 void nft_chain_del(struct nft_chain *chain)
9542 {
9543 struct nft_table *table = chain->table;
9544
9545 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9546 nft_chain_ht_params));
9547 list_del_rcu(&chain->list);
9548 }
9549
nft_trans_gc_setelem_remove(struct nft_ctx * ctx,struct nft_trans_gc * trans)9550 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9551 struct nft_trans_gc *trans)
9552 {
9553 void **priv = trans->priv;
9554 unsigned int i;
9555
9556 for (i = 0; i < trans->count; i++) {
9557 struct nft_set_elem elem = {
9558 .priv = priv[i],
9559 };
9560
9561 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9562 nft_setelem_remove(ctx->net, trans->set, &elem);
9563 }
9564 }
9565
nft_trans_gc_destroy(struct nft_trans_gc * trans)9566 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9567 {
9568 nft_set_put(trans->set);
9569 put_net(trans->net);
9570 kfree(trans);
9571 }
9572
nft_trans_gc_trans_free(struct rcu_head * rcu)9573 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9574 {
9575 struct nft_set_elem elem = {};
9576 struct nft_trans_gc *trans;
9577 struct nft_ctx ctx = {};
9578 unsigned int i;
9579
9580 trans = container_of(rcu, struct nft_trans_gc, rcu);
9581 ctx.net = read_pnet(&trans->set->net);
9582
9583 for (i = 0; i < trans->count; i++) {
9584 elem.priv = trans->priv[i];
9585 if (!nft_setelem_is_catchall(trans->set, &elem))
9586 atomic_dec(&trans->set->nelems);
9587
9588 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9589 }
9590
9591 nft_trans_gc_destroy(trans);
9592 }
9593
nft_trans_gc_work_done(struct nft_trans_gc * trans)9594 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9595 {
9596 struct nftables_pernet *nft_net;
9597 struct nft_ctx ctx = {};
9598
9599 nft_net = nft_pernet(trans->net);
9600
9601 mutex_lock(&nft_net->commit_mutex);
9602
9603 /* Check for race with transaction, otherwise this batch refers to
9604 * stale objects that might not be there anymore. Skip transaction if
9605 * set has been destroyed from control plane transaction in case gc
9606 * worker loses race.
9607 */
9608 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9609 mutex_unlock(&nft_net->commit_mutex);
9610 return false;
9611 }
9612
9613 ctx.net = trans->net;
9614 ctx.table = trans->set->table;
9615
9616 nft_trans_gc_setelem_remove(&ctx, trans);
9617 mutex_unlock(&nft_net->commit_mutex);
9618
9619 return true;
9620 }
9621
nft_trans_gc_work(struct work_struct * work)9622 static void nft_trans_gc_work(struct work_struct *work)
9623 {
9624 struct nft_trans_gc *trans, *next;
9625 LIST_HEAD(trans_gc_list);
9626
9627 spin_lock(&nf_tables_gc_list_lock);
9628 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9629 spin_unlock(&nf_tables_gc_list_lock);
9630
9631 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9632 list_del(&trans->list);
9633 if (!nft_trans_gc_work_done(trans)) {
9634 nft_trans_gc_destroy(trans);
9635 continue;
9636 }
9637 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9638 }
9639 }
9640
nft_trans_gc_alloc(struct nft_set * set,unsigned int gc_seq,gfp_t gfp)9641 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9642 unsigned int gc_seq, gfp_t gfp)
9643 {
9644 struct net *net = read_pnet(&set->net);
9645 struct nft_trans_gc *trans;
9646
9647 trans = kzalloc(sizeof(*trans), gfp);
9648 if (!trans)
9649 return NULL;
9650
9651 trans->net = maybe_get_net(net);
9652 if (!trans->net) {
9653 kfree(trans);
9654 return NULL;
9655 }
9656
9657 refcount_inc(&set->refs);
9658 trans->set = set;
9659 trans->seq = gc_seq;
9660
9661 return trans;
9662 }
9663
nft_trans_gc_elem_add(struct nft_trans_gc * trans,void * priv)9664 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9665 {
9666 trans->priv[trans->count++] = priv;
9667 }
9668
nft_trans_gc_queue_work(struct nft_trans_gc * trans)9669 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9670 {
9671 spin_lock(&nf_tables_gc_list_lock);
9672 list_add_tail(&trans->list, &nf_tables_gc_list);
9673 spin_unlock(&nf_tables_gc_list_lock);
9674
9675 schedule_work(&trans_gc_work);
9676 }
9677
nft_trans_gc_space(struct nft_trans_gc * trans)9678 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9679 {
9680 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9681 }
9682
nft_trans_gc_queue_async(struct nft_trans_gc * gc,unsigned int gc_seq,gfp_t gfp)9683 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9684 unsigned int gc_seq, gfp_t gfp)
9685 {
9686 struct nft_set *set;
9687
9688 if (nft_trans_gc_space(gc))
9689 return gc;
9690
9691 set = gc->set;
9692 nft_trans_gc_queue_work(gc);
9693
9694 return nft_trans_gc_alloc(set, gc_seq, gfp);
9695 }
9696
nft_trans_gc_queue_async_done(struct nft_trans_gc * trans)9697 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9698 {
9699 if (trans->count == 0) {
9700 nft_trans_gc_destroy(trans);
9701 return;
9702 }
9703
9704 nft_trans_gc_queue_work(trans);
9705 }
9706
nft_trans_gc_queue_sync(struct nft_trans_gc * gc,gfp_t gfp)9707 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9708 {
9709 struct nft_set *set;
9710
9711 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9712 return NULL;
9713
9714 if (nft_trans_gc_space(gc))
9715 return gc;
9716
9717 set = gc->set;
9718 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9719
9720 return nft_trans_gc_alloc(set, 0, gfp);
9721 }
9722
nft_trans_gc_queue_sync_done(struct nft_trans_gc * trans)9723 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9724 {
9725 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9726
9727 if (trans->count == 0) {
9728 nft_trans_gc_destroy(trans);
9729 return;
9730 }
9731
9732 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9733 }
9734
nft_trans_gc_catchall_async(struct nft_trans_gc * gc,unsigned int gc_seq)9735 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9736 unsigned int gc_seq)
9737 {
9738 struct nft_set_elem_catchall *catchall;
9739 const struct nft_set *set = gc->set;
9740 struct nft_set_ext *ext;
9741
9742 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9743 ext = nft_set_elem_ext(set, catchall->elem);
9744
9745 if (!nft_set_elem_expired(ext))
9746 continue;
9747 if (nft_set_elem_is_dead(ext))
9748 goto dead_elem;
9749
9750 nft_set_elem_dead(ext);
9751 dead_elem:
9752 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9753 if (!gc)
9754 return NULL;
9755
9756 nft_trans_gc_elem_add(gc, catchall->elem);
9757 }
9758
9759 return gc;
9760 }
9761
nft_trans_gc_catchall_sync(struct nft_trans_gc * gc)9762 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9763 {
9764 struct nft_set_elem_catchall *catchall, *next;
9765 const struct nft_set *set = gc->set;
9766 struct nft_set_elem elem;
9767 struct nft_set_ext *ext;
9768
9769 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9770
9771 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9772 ext = nft_set_elem_ext(set, catchall->elem);
9773
9774 if (!nft_set_elem_expired(ext))
9775 continue;
9776
9777 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9778 if (!gc)
9779 return NULL;
9780
9781 memset(&elem, 0, sizeof(elem));
9782 elem.priv = catchall->elem;
9783
9784 nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9785 nft_setelem_catchall_destroy(catchall);
9786 nft_trans_gc_elem_add(gc, elem.priv);
9787 }
9788
9789 return gc;
9790 }
9791
nf_tables_module_autoload_cleanup(struct net * net)9792 static void nf_tables_module_autoload_cleanup(struct net *net)
9793 {
9794 struct nftables_pernet *nft_net = nft_pernet(net);
9795 struct nft_module_request *req, *next;
9796
9797 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9798 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9799 WARN_ON_ONCE(!req->done);
9800 list_del(&req->list);
9801 kfree(req);
9802 }
9803 }
9804
nf_tables_commit_release(struct net * net)9805 static void nf_tables_commit_release(struct net *net)
9806 {
9807 struct nftables_pernet *nft_net = nft_pernet(net);
9808 struct nft_trans *trans;
9809
9810 /* all side effects have to be made visible.
9811 * For example, if a chain named 'foo' has been deleted, a
9812 * new transaction must not find it anymore.
9813 *
9814 * Memory reclaim happens asynchronously from work queue
9815 * to prevent expensive synchronize_rcu() in commit phase.
9816 */
9817 if (list_empty(&nft_net->commit_list)) {
9818 nf_tables_module_autoload_cleanup(net);
9819 mutex_unlock(&nft_net->commit_mutex);
9820 return;
9821 }
9822
9823 trans = list_last_entry(&nft_net->commit_list,
9824 struct nft_trans, list);
9825 get_net(trans->ctx.net);
9826 WARN_ON_ONCE(trans->put_net);
9827
9828 trans->put_net = true;
9829 spin_lock(&nf_tables_destroy_list_lock);
9830 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9831 spin_unlock(&nf_tables_destroy_list_lock);
9832
9833 nf_tables_module_autoload_cleanup(net);
9834 schedule_work(&trans_destroy_work);
9835
9836 mutex_unlock(&nft_net->commit_mutex);
9837 }
9838
nft_commit_notify(struct net * net,u32 portid)9839 static void nft_commit_notify(struct net *net, u32 portid)
9840 {
9841 struct nftables_pernet *nft_net = nft_pernet(net);
9842 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9843 unsigned char *data;
9844 int len;
9845
9846 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9847 if (!batch_skb) {
9848 new_batch:
9849 batch_skb = skb;
9850 len = NLMSG_GOODSIZE - skb->len;
9851 list_del(&skb->list);
9852 continue;
9853 }
9854 len -= skb->len;
9855 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9856 data = skb_put(batch_skb, skb->len);
9857 memcpy(data, skb->data, skb->len);
9858 list_del(&skb->list);
9859 kfree_skb(skb);
9860 continue;
9861 }
9862 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9863 NFT_CB(batch_skb).report, GFP_KERNEL);
9864 goto new_batch;
9865 }
9866
9867 if (batch_skb) {
9868 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9869 NFT_CB(batch_skb).report, GFP_KERNEL);
9870 }
9871
9872 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9873 }
9874
nf_tables_commit_audit_alloc(struct list_head * adl,struct nft_table * table)9875 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9876 struct nft_table *table)
9877 {
9878 struct nft_audit_data *adp;
9879
9880 list_for_each_entry(adp, adl, list) {
9881 if (adp->table == table)
9882 return 0;
9883 }
9884 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9885 if (!adp)
9886 return -ENOMEM;
9887 adp->table = table;
9888 list_add(&adp->list, adl);
9889 return 0;
9890 }
9891
nf_tables_commit_audit_free(struct list_head * adl)9892 static void nf_tables_commit_audit_free(struct list_head *adl)
9893 {
9894 struct nft_audit_data *adp, *adn;
9895
9896 list_for_each_entry_safe(adp, adn, adl, list) {
9897 list_del(&adp->list);
9898 kfree(adp);
9899 }
9900 }
9901
nf_tables_commit_audit_collect(struct list_head * adl,struct nft_table * table,u32 op)9902 static void nf_tables_commit_audit_collect(struct list_head *adl,
9903 struct nft_table *table, u32 op)
9904 {
9905 struct nft_audit_data *adp;
9906
9907 list_for_each_entry(adp, adl, list) {
9908 if (adp->table == table)
9909 goto found;
9910 }
9911 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9912 return;
9913 found:
9914 adp->entries++;
9915 if (!adp->op || adp->op > op)
9916 adp->op = op;
9917 }
9918
9919 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9920
nf_tables_commit_audit_log(struct list_head * adl,u32 generation)9921 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9922 {
9923 struct nft_audit_data *adp, *adn;
9924 char aubuf[AUNFTABLENAMELEN];
9925
9926 list_for_each_entry_safe(adp, adn, adl, list) {
9927 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9928 generation);
9929 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9930 nft2audit_op[adp->op], GFP_KERNEL);
9931 list_del(&adp->list);
9932 kfree(adp);
9933 }
9934 }
9935
nft_set_commit_update(struct list_head * set_update_list)9936 static void nft_set_commit_update(struct list_head *set_update_list)
9937 {
9938 struct nft_set *set, *next;
9939
9940 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9941 list_del_init(&set->pending_update);
9942
9943 if (!set->ops->commit || set->dead)
9944 continue;
9945
9946 set->ops->commit(set);
9947 }
9948 }
9949
nft_gc_seq_begin(struct nftables_pernet * nft_net)9950 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9951 {
9952 unsigned int gc_seq;
9953
9954 /* Bump gc counter, it becomes odd, this is the busy mark. */
9955 gc_seq = READ_ONCE(nft_net->gc_seq);
9956 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9957
9958 return gc_seq;
9959 }
9960
nft_gc_seq_end(struct nftables_pernet * nft_net,unsigned int gc_seq)9961 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9962 {
9963 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9964 }
9965
nf_tables_commit(struct net * net,struct sk_buff * skb)9966 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9967 {
9968 struct nftables_pernet *nft_net = nft_pernet(net);
9969 struct nft_trans *trans, *next;
9970 unsigned int base_seq, gc_seq;
9971 LIST_HEAD(set_update_list);
9972 struct nft_trans_elem *te;
9973 struct nft_chain *chain;
9974 struct nft_table *table;
9975 LIST_HEAD(adl);
9976 int err;
9977
9978 if (list_empty(&nft_net->commit_list)) {
9979 mutex_unlock(&nft_net->commit_mutex);
9980 return 0;
9981 }
9982
9983 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9984 switch (trans->msg_type) {
9985 case NFT_MSG_NEWSET:
9986 if (!nft_trans_set_update(trans) &&
9987 nft_set_is_anonymous(nft_trans_set(trans)) &&
9988 !nft_trans_set_bound(trans)) {
9989 pr_warn_once("nftables ruleset with unbound set\n");
9990 return -EINVAL;
9991 }
9992 break;
9993 case NFT_MSG_NEWCHAIN:
9994 if (!nft_trans_chain_update(trans) &&
9995 nft_chain_binding(nft_trans_chain(trans)) &&
9996 !nft_trans_chain_bound(trans)) {
9997 pr_warn_once("nftables ruleset with unbound chain\n");
9998 return -EINVAL;
9999 }
10000 break;
10001 }
10002 }
10003
10004 /* 0. Validate ruleset, otherwise roll back for error reporting. */
10005 if (nf_tables_validate(net) < 0) {
10006 nft_net->validate_state = NFT_VALIDATE_DO;
10007 return -EAGAIN;
10008 }
10009
10010 err = nft_flow_rule_offload_commit(net);
10011 if (err < 0)
10012 return err;
10013
10014 /* 1. Allocate space for next generation rules_gen_X[] */
10015 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10016 int ret;
10017
10018 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10019 if (ret) {
10020 nf_tables_commit_chain_prepare_cancel(net);
10021 nf_tables_commit_audit_free(&adl);
10022 return ret;
10023 }
10024 if (trans->msg_type == NFT_MSG_NEWRULE ||
10025 trans->msg_type == NFT_MSG_DELRULE) {
10026 chain = trans->ctx.chain;
10027
10028 ret = nf_tables_commit_chain_prepare(net, chain);
10029 if (ret < 0) {
10030 nf_tables_commit_chain_prepare_cancel(net);
10031 nf_tables_commit_audit_free(&adl);
10032 return ret;
10033 }
10034 }
10035 }
10036
10037 /* step 2. Make rules_gen_X visible to packet path */
10038 list_for_each_entry(table, &nft_net->tables, list) {
10039 list_for_each_entry(chain, &table->chains, list)
10040 nf_tables_commit_chain(net, chain);
10041 }
10042
10043 /*
10044 * Bump generation counter, invalidate any dump in progress.
10045 * Cannot fail after this point.
10046 */
10047 base_seq = READ_ONCE(nft_net->base_seq);
10048 while (++base_seq == 0)
10049 ;
10050
10051 WRITE_ONCE(nft_net->base_seq, base_seq);
10052
10053 gc_seq = nft_gc_seq_begin(nft_net);
10054
10055 /* step 3. Start new generation, rules_gen_X now in use. */
10056 net->nft.gencursor = nft_gencursor_next(net);
10057
10058 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10059 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10060 trans->msg_type);
10061 switch (trans->msg_type) {
10062 case NFT_MSG_NEWTABLE:
10063 if (nft_trans_table_update(trans)) {
10064 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10065 nft_trans_destroy(trans);
10066 break;
10067 }
10068 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10069 nf_tables_table_disable(net, trans->ctx.table);
10070
10071 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10072 } else {
10073 nft_clear(net, trans->ctx.table);
10074 }
10075 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10076 nft_trans_destroy(trans);
10077 break;
10078 case NFT_MSG_DELTABLE:
10079 case NFT_MSG_DESTROYTABLE:
10080 list_del_rcu(&trans->ctx.table->list);
10081 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10082 break;
10083 case NFT_MSG_NEWCHAIN:
10084 if (nft_trans_chain_update(trans)) {
10085 nft_chain_commit_update(trans);
10086 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10087 &nft_trans_chain_hooks(trans));
10088 list_splice(&nft_trans_chain_hooks(trans),
10089 &nft_trans_basechain(trans)->hook_list);
10090 /* trans destroyed after rcu grace period */
10091 } else {
10092 nft_chain_commit_drop_policy(trans);
10093 nft_clear(net, trans->ctx.chain);
10094 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10095 nft_trans_destroy(trans);
10096 }
10097 break;
10098 case NFT_MSG_DELCHAIN:
10099 case NFT_MSG_DESTROYCHAIN:
10100 if (nft_trans_chain_update(trans)) {
10101 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10102 &nft_trans_chain_hooks(trans));
10103 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10104 nft_netdev_unregister_hooks(net,
10105 &nft_trans_chain_hooks(trans),
10106 true);
10107 }
10108 } else {
10109 nft_chain_del(trans->ctx.chain);
10110 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10111 NULL);
10112 nf_tables_unregister_hook(trans->ctx.net,
10113 trans->ctx.table,
10114 trans->ctx.chain);
10115 }
10116 break;
10117 case NFT_MSG_NEWRULE:
10118 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10119 nf_tables_rule_notify(&trans->ctx,
10120 nft_trans_rule(trans),
10121 NFT_MSG_NEWRULE);
10122 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10123 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10124
10125 nft_trans_destroy(trans);
10126 break;
10127 case NFT_MSG_DELRULE:
10128 case NFT_MSG_DESTROYRULE:
10129 list_del_rcu(&nft_trans_rule(trans)->list);
10130 nf_tables_rule_notify(&trans->ctx,
10131 nft_trans_rule(trans),
10132 trans->msg_type);
10133 nft_rule_expr_deactivate(&trans->ctx,
10134 nft_trans_rule(trans),
10135 NFT_TRANS_COMMIT);
10136
10137 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10138 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10139 break;
10140 case NFT_MSG_NEWSET:
10141 if (nft_trans_set_update(trans)) {
10142 struct nft_set *set = nft_trans_set(trans);
10143
10144 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10145 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10146
10147 if (nft_trans_set_size(trans))
10148 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10149 } else {
10150 nft_clear(net, nft_trans_set(trans));
10151 /* This avoids hitting -EBUSY when deleting the table
10152 * from the transaction.
10153 */
10154 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10155 !list_empty(&nft_trans_set(trans)->bindings))
10156 nft_use_dec(&trans->ctx.table->use);
10157 }
10158 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10159 NFT_MSG_NEWSET, GFP_KERNEL);
10160 nft_trans_destroy(trans);
10161 break;
10162 case NFT_MSG_DELSET:
10163 case NFT_MSG_DESTROYSET:
10164 nft_trans_set(trans)->dead = 1;
10165 list_del_rcu(&nft_trans_set(trans)->list);
10166 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10167 trans->msg_type, GFP_KERNEL);
10168 break;
10169 case NFT_MSG_NEWSETELEM:
10170 te = (struct nft_trans_elem *)trans->data;
10171
10172 nft_setelem_activate(net, te->set, &te->elem);
10173 nf_tables_setelem_notify(&trans->ctx, te->set,
10174 &te->elem,
10175 NFT_MSG_NEWSETELEM);
10176 if (te->set->ops->commit &&
10177 list_empty(&te->set->pending_update)) {
10178 list_add_tail(&te->set->pending_update,
10179 &set_update_list);
10180 }
10181 nft_trans_destroy(trans);
10182 break;
10183 case NFT_MSG_DELSETELEM:
10184 case NFT_MSG_DESTROYSETELEM:
10185 te = (struct nft_trans_elem *)trans->data;
10186
10187 nf_tables_setelem_notify(&trans->ctx, te->set,
10188 &te->elem,
10189 trans->msg_type);
10190 nft_setelem_remove(net, te->set, &te->elem);
10191 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10192 atomic_dec(&te->set->nelems);
10193 te->set->ndeact--;
10194 }
10195 if (te->set->ops->commit &&
10196 list_empty(&te->set->pending_update)) {
10197 list_add_tail(&te->set->pending_update,
10198 &set_update_list);
10199 }
10200 break;
10201 case NFT_MSG_NEWOBJ:
10202 if (nft_trans_obj_update(trans)) {
10203 nft_obj_commit_update(trans);
10204 nf_tables_obj_notify(&trans->ctx,
10205 nft_trans_obj(trans),
10206 NFT_MSG_NEWOBJ);
10207 } else {
10208 nft_clear(net, nft_trans_obj(trans));
10209 nf_tables_obj_notify(&trans->ctx,
10210 nft_trans_obj(trans),
10211 NFT_MSG_NEWOBJ);
10212 nft_trans_destroy(trans);
10213 }
10214 break;
10215 case NFT_MSG_DELOBJ:
10216 case NFT_MSG_DESTROYOBJ:
10217 nft_obj_del(nft_trans_obj(trans));
10218 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10219 trans->msg_type);
10220 break;
10221 case NFT_MSG_NEWFLOWTABLE:
10222 if (nft_trans_flowtable_update(trans)) {
10223 nft_trans_flowtable(trans)->data.flags =
10224 nft_trans_flowtable_flags(trans);
10225 nf_tables_flowtable_notify(&trans->ctx,
10226 nft_trans_flowtable(trans),
10227 &nft_trans_flowtable_hooks(trans),
10228 NFT_MSG_NEWFLOWTABLE);
10229 list_splice(&nft_trans_flowtable_hooks(trans),
10230 &nft_trans_flowtable(trans)->hook_list);
10231 } else {
10232 nft_clear(net, nft_trans_flowtable(trans));
10233 nf_tables_flowtable_notify(&trans->ctx,
10234 nft_trans_flowtable(trans),
10235 NULL,
10236 NFT_MSG_NEWFLOWTABLE);
10237 }
10238 nft_trans_destroy(trans);
10239 break;
10240 case NFT_MSG_DELFLOWTABLE:
10241 case NFT_MSG_DESTROYFLOWTABLE:
10242 if (nft_trans_flowtable_update(trans)) {
10243 nf_tables_flowtable_notify(&trans->ctx,
10244 nft_trans_flowtable(trans),
10245 &nft_trans_flowtable_hooks(trans),
10246 trans->msg_type);
10247 nft_unregister_flowtable_net_hooks(net,
10248 &nft_trans_flowtable_hooks(trans));
10249 } else {
10250 list_del_rcu(&nft_trans_flowtable(trans)->list);
10251 nf_tables_flowtable_notify(&trans->ctx,
10252 nft_trans_flowtable(trans),
10253 NULL,
10254 trans->msg_type);
10255 nft_unregister_flowtable_net_hooks(net,
10256 &nft_trans_flowtable(trans)->hook_list);
10257 }
10258 break;
10259 }
10260 }
10261
10262 nft_set_commit_update(&set_update_list);
10263
10264 nft_commit_notify(net, NETLINK_CB(skb).portid);
10265 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10266 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10267
10268 nft_gc_seq_end(nft_net, gc_seq);
10269 nft_net->validate_state = NFT_VALIDATE_SKIP;
10270 nf_tables_commit_release(net);
10271
10272 return 0;
10273 }
10274
nf_tables_module_autoload(struct net * net)10275 static void nf_tables_module_autoload(struct net *net)
10276 {
10277 struct nftables_pernet *nft_net = nft_pernet(net);
10278 struct nft_module_request *req, *next;
10279 LIST_HEAD(module_list);
10280
10281 list_splice_init(&nft_net->module_list, &module_list);
10282 mutex_unlock(&nft_net->commit_mutex);
10283 list_for_each_entry_safe(req, next, &module_list, list) {
10284 request_module("%s", req->module);
10285 req->done = true;
10286 }
10287 mutex_lock(&nft_net->commit_mutex);
10288 list_splice(&module_list, &nft_net->module_list);
10289 }
10290
nf_tables_abort_release(struct nft_trans * trans)10291 static void nf_tables_abort_release(struct nft_trans *trans)
10292 {
10293 switch (trans->msg_type) {
10294 case NFT_MSG_NEWTABLE:
10295 nf_tables_table_destroy(&trans->ctx);
10296 break;
10297 case NFT_MSG_NEWCHAIN:
10298 if (nft_trans_chain_update(trans))
10299 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10300 else
10301 nf_tables_chain_destroy(&trans->ctx);
10302 break;
10303 case NFT_MSG_NEWRULE:
10304 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10305 break;
10306 case NFT_MSG_NEWSET:
10307 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10308 break;
10309 case NFT_MSG_NEWSETELEM:
10310 nft_set_elem_destroy(nft_trans_elem_set(trans),
10311 nft_trans_elem(trans).priv, true);
10312 break;
10313 case NFT_MSG_NEWOBJ:
10314 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10315 break;
10316 case NFT_MSG_NEWFLOWTABLE:
10317 if (nft_trans_flowtable_update(trans))
10318 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10319 else
10320 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10321 break;
10322 }
10323 kfree(trans);
10324 }
10325
nft_set_abort_update(struct list_head * set_update_list)10326 static void nft_set_abort_update(struct list_head *set_update_list)
10327 {
10328 struct nft_set *set, *next;
10329
10330 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10331 list_del_init(&set->pending_update);
10332
10333 if (!set->ops->abort)
10334 continue;
10335
10336 set->ops->abort(set);
10337 }
10338 }
10339
__nf_tables_abort(struct net * net,enum nfnl_abort_action action)10340 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10341 {
10342 struct nftables_pernet *nft_net = nft_pernet(net);
10343 struct nft_trans *trans, *next;
10344 LIST_HEAD(set_update_list);
10345 struct nft_trans_elem *te;
10346 int err = 0;
10347
10348 if (action == NFNL_ABORT_VALIDATE &&
10349 nf_tables_validate(net) < 0)
10350 err = -EAGAIN;
10351
10352 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10353 list) {
10354 switch (trans->msg_type) {
10355 case NFT_MSG_NEWTABLE:
10356 if (nft_trans_table_update(trans)) {
10357 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10358 nft_trans_destroy(trans);
10359 break;
10360 }
10361 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10362 nf_tables_table_disable(net, trans->ctx.table);
10363 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10364 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10365 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10366 }
10367 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10368 nft_trans_destroy(trans);
10369 } else {
10370 list_del_rcu(&trans->ctx.table->list);
10371 }
10372 break;
10373 case NFT_MSG_DELTABLE:
10374 case NFT_MSG_DESTROYTABLE:
10375 nft_clear(trans->ctx.net, trans->ctx.table);
10376 nft_trans_destroy(trans);
10377 break;
10378 case NFT_MSG_NEWCHAIN:
10379 if (nft_trans_chain_update(trans)) {
10380 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10381 nft_netdev_unregister_hooks(net,
10382 &nft_trans_chain_hooks(trans),
10383 true);
10384 }
10385 free_percpu(nft_trans_chain_stats(trans));
10386 kfree(nft_trans_chain_name(trans));
10387 nft_trans_destroy(trans);
10388 } else {
10389 if (nft_trans_chain_bound(trans)) {
10390 nft_trans_destroy(trans);
10391 break;
10392 }
10393 nft_use_dec_restore(&trans->ctx.table->use);
10394 nft_chain_del(trans->ctx.chain);
10395 nf_tables_unregister_hook(trans->ctx.net,
10396 trans->ctx.table,
10397 trans->ctx.chain);
10398 }
10399 break;
10400 case NFT_MSG_DELCHAIN:
10401 case NFT_MSG_DESTROYCHAIN:
10402 if (nft_trans_chain_update(trans)) {
10403 list_splice(&nft_trans_chain_hooks(trans),
10404 &nft_trans_basechain(trans)->hook_list);
10405 } else {
10406 nft_use_inc_restore(&trans->ctx.table->use);
10407 nft_clear(trans->ctx.net, trans->ctx.chain);
10408 }
10409 nft_trans_destroy(trans);
10410 break;
10411 case NFT_MSG_NEWRULE:
10412 if (nft_trans_rule_bound(trans)) {
10413 nft_trans_destroy(trans);
10414 break;
10415 }
10416 nft_use_dec_restore(&trans->ctx.chain->use);
10417 list_del_rcu(&nft_trans_rule(trans)->list);
10418 nft_rule_expr_deactivate(&trans->ctx,
10419 nft_trans_rule(trans),
10420 NFT_TRANS_ABORT);
10421 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10422 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10423 break;
10424 case NFT_MSG_DELRULE:
10425 case NFT_MSG_DESTROYRULE:
10426 nft_use_inc_restore(&trans->ctx.chain->use);
10427 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10428 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10429 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10430 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10431
10432 nft_trans_destroy(trans);
10433 break;
10434 case NFT_MSG_NEWSET:
10435 if (nft_trans_set_update(trans)) {
10436 nft_trans_destroy(trans);
10437 break;
10438 }
10439 nft_use_dec_restore(&trans->ctx.table->use);
10440 if (nft_trans_set_bound(trans)) {
10441 nft_trans_destroy(trans);
10442 break;
10443 }
10444 nft_trans_set(trans)->dead = 1;
10445 list_del_rcu(&nft_trans_set(trans)->list);
10446 break;
10447 case NFT_MSG_DELSET:
10448 case NFT_MSG_DESTROYSET:
10449 nft_use_inc_restore(&trans->ctx.table->use);
10450 nft_clear(trans->ctx.net, nft_trans_set(trans));
10451 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10452 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10453
10454 nft_trans_destroy(trans);
10455 break;
10456 case NFT_MSG_NEWSETELEM:
10457 if (nft_trans_elem_set_bound(trans)) {
10458 nft_trans_destroy(trans);
10459 break;
10460 }
10461 te = (struct nft_trans_elem *)trans->data;
10462 nft_setelem_remove(net, te->set, &te->elem);
10463 if (!nft_setelem_is_catchall(te->set, &te->elem))
10464 atomic_dec(&te->set->nelems);
10465
10466 if (te->set->ops->abort &&
10467 list_empty(&te->set->pending_update)) {
10468 list_add_tail(&te->set->pending_update,
10469 &set_update_list);
10470 }
10471 break;
10472 case NFT_MSG_DELSETELEM:
10473 case NFT_MSG_DESTROYSETELEM:
10474 te = (struct nft_trans_elem *)trans->data;
10475
10476 nft_setelem_data_activate(net, te->set, &te->elem);
10477 nft_setelem_activate(net, te->set, &te->elem);
10478 if (!nft_setelem_is_catchall(te->set, &te->elem))
10479 te->set->ndeact--;
10480
10481 if (te->set->ops->abort &&
10482 list_empty(&te->set->pending_update)) {
10483 list_add_tail(&te->set->pending_update,
10484 &set_update_list);
10485 }
10486 nft_trans_destroy(trans);
10487 break;
10488 case NFT_MSG_NEWOBJ:
10489 if (nft_trans_obj_update(trans)) {
10490 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10491 nft_trans_destroy(trans);
10492 } else {
10493 nft_use_dec_restore(&trans->ctx.table->use);
10494 nft_obj_del(nft_trans_obj(trans));
10495 }
10496 break;
10497 case NFT_MSG_DELOBJ:
10498 case NFT_MSG_DESTROYOBJ:
10499 nft_use_inc_restore(&trans->ctx.table->use);
10500 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10501 nft_trans_destroy(trans);
10502 break;
10503 case NFT_MSG_NEWFLOWTABLE:
10504 if (nft_trans_flowtable_update(trans)) {
10505 nft_unregister_flowtable_net_hooks(net,
10506 &nft_trans_flowtable_hooks(trans));
10507 } else {
10508 nft_use_dec_restore(&trans->ctx.table->use);
10509 list_del_rcu(&nft_trans_flowtable(trans)->list);
10510 nft_unregister_flowtable_net_hooks(net,
10511 &nft_trans_flowtable(trans)->hook_list);
10512 }
10513 break;
10514 case NFT_MSG_DELFLOWTABLE:
10515 case NFT_MSG_DESTROYFLOWTABLE:
10516 if (nft_trans_flowtable_update(trans)) {
10517 list_splice(&nft_trans_flowtable_hooks(trans),
10518 &nft_trans_flowtable(trans)->hook_list);
10519 } else {
10520 nft_use_inc_restore(&trans->ctx.table->use);
10521 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10522 }
10523 nft_trans_destroy(trans);
10524 break;
10525 }
10526 }
10527
10528 nft_set_abort_update(&set_update_list);
10529
10530 synchronize_rcu();
10531
10532 list_for_each_entry_safe_reverse(trans, next,
10533 &nft_net->commit_list, list) {
10534 nft_trans_list_del(trans);
10535 nf_tables_abort_release(trans);
10536 }
10537
10538 return err;
10539 }
10540
nf_tables_abort(struct net * net,struct sk_buff * skb,enum nfnl_abort_action action)10541 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10542 enum nfnl_abort_action action)
10543 {
10544 struct nftables_pernet *nft_net = nft_pernet(net);
10545 unsigned int gc_seq;
10546 int ret;
10547
10548 gc_seq = nft_gc_seq_begin(nft_net);
10549 ret = __nf_tables_abort(net, action);
10550 nft_gc_seq_end(nft_net, gc_seq);
10551
10552 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10553
10554 /* module autoload needs to happen after GC sequence update because it
10555 * temporarily releases and grabs mutex again.
10556 */
10557 if (action == NFNL_ABORT_AUTOLOAD)
10558 nf_tables_module_autoload(net);
10559 else
10560 nf_tables_module_autoload_cleanup(net);
10561
10562 mutex_unlock(&nft_net->commit_mutex);
10563
10564 return ret;
10565 }
10566
nf_tables_valid_genid(struct net * net,u32 genid)10567 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10568 {
10569 struct nftables_pernet *nft_net = nft_pernet(net);
10570 bool genid_ok;
10571
10572 mutex_lock(&nft_net->commit_mutex);
10573
10574 genid_ok = genid == 0 || nft_net->base_seq == genid;
10575 if (!genid_ok)
10576 mutex_unlock(&nft_net->commit_mutex);
10577
10578 /* else, commit mutex has to be released by commit or abort function */
10579 return genid_ok;
10580 }
10581
10582 static const struct nfnetlink_subsystem nf_tables_subsys = {
10583 .name = "nf_tables",
10584 .subsys_id = NFNL_SUBSYS_NFTABLES,
10585 .cb_count = NFT_MSG_MAX,
10586 .cb = nf_tables_cb,
10587 .commit = nf_tables_commit,
10588 .abort = nf_tables_abort,
10589 .valid_genid = nf_tables_valid_genid,
10590 .owner = THIS_MODULE,
10591 };
10592
nft_chain_validate_dependency(const struct nft_chain * chain,enum nft_chain_types type)10593 int nft_chain_validate_dependency(const struct nft_chain *chain,
10594 enum nft_chain_types type)
10595 {
10596 const struct nft_base_chain *basechain;
10597
10598 if (nft_is_base_chain(chain)) {
10599 basechain = nft_base_chain(chain);
10600 if (basechain->type->type != type)
10601 return -EOPNOTSUPP;
10602 }
10603 return 0;
10604 }
10605 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10606
nft_chain_validate_hooks(const struct nft_chain * chain,unsigned int hook_flags)10607 int nft_chain_validate_hooks(const struct nft_chain *chain,
10608 unsigned int hook_flags)
10609 {
10610 struct nft_base_chain *basechain;
10611
10612 if (nft_is_base_chain(chain)) {
10613 basechain = nft_base_chain(chain);
10614
10615 if ((1 << basechain->ops.hooknum) & hook_flags)
10616 return 0;
10617
10618 return -EOPNOTSUPP;
10619 }
10620
10621 return 0;
10622 }
10623 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10624
10625 /*
10626 * Loop detection - walk through the ruleset beginning at the destination chain
10627 * of a new jump until either the source chain is reached (loop) or all
10628 * reachable chains have been traversed.
10629 *
10630 * The loop check is performed whenever a new jump verdict is added to an
10631 * expression or verdict map or a verdict map is bound to a new chain.
10632 */
10633
10634 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10635 const struct nft_chain *chain);
10636
nft_check_loops(const struct nft_ctx * ctx,const struct nft_set_ext * ext)10637 static int nft_check_loops(const struct nft_ctx *ctx,
10638 const struct nft_set_ext *ext)
10639 {
10640 const struct nft_data *data;
10641 int ret;
10642
10643 data = nft_set_ext_data(ext);
10644 switch (data->verdict.code) {
10645 case NFT_JUMP:
10646 case NFT_GOTO:
10647 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10648 break;
10649 default:
10650 ret = 0;
10651 break;
10652 }
10653
10654 return ret;
10655 }
10656
nf_tables_loop_check_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)10657 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10658 struct nft_set *set,
10659 const struct nft_set_iter *iter,
10660 struct nft_set_elem *elem)
10661 {
10662 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10663
10664 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10665 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10666 return 0;
10667
10668 return nft_check_loops(ctx, ext);
10669 }
10670
nft_set_catchall_loops(const struct nft_ctx * ctx,struct nft_set * set)10671 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10672 struct nft_set *set)
10673 {
10674 u8 genmask = nft_genmask_next(ctx->net);
10675 struct nft_set_elem_catchall *catchall;
10676 struct nft_set_ext *ext;
10677 int ret = 0;
10678
10679 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10680 ext = nft_set_elem_ext(set, catchall->elem);
10681 if (!nft_set_elem_active(ext, genmask))
10682 continue;
10683
10684 ret = nft_check_loops(ctx, ext);
10685 if (ret < 0)
10686 return ret;
10687 }
10688
10689 return ret;
10690 }
10691
nf_tables_check_loops(const struct nft_ctx * ctx,const struct nft_chain * chain)10692 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10693 const struct nft_chain *chain)
10694 {
10695 const struct nft_rule *rule;
10696 const struct nft_expr *expr, *last;
10697 struct nft_set *set;
10698 struct nft_set_binding *binding;
10699 struct nft_set_iter iter;
10700
10701 if (ctx->chain == chain)
10702 return -ELOOP;
10703
10704 if (fatal_signal_pending(current))
10705 return -EINTR;
10706
10707 list_for_each_entry(rule, &chain->rules, list) {
10708 nft_rule_for_each_expr(expr, last, rule) {
10709 struct nft_immediate_expr *priv;
10710 const struct nft_data *data;
10711 int err;
10712
10713 if (strcmp(expr->ops->type->name, "immediate"))
10714 continue;
10715
10716 priv = nft_expr_priv(expr);
10717 if (priv->dreg != NFT_REG_VERDICT)
10718 continue;
10719
10720 data = &priv->data;
10721 switch (data->verdict.code) {
10722 case NFT_JUMP:
10723 case NFT_GOTO:
10724 err = nf_tables_check_loops(ctx,
10725 data->verdict.chain);
10726 if (err < 0)
10727 return err;
10728 break;
10729 default:
10730 break;
10731 }
10732 }
10733 }
10734
10735 list_for_each_entry(set, &ctx->table->sets, list) {
10736 if (!nft_is_active_next(ctx->net, set))
10737 continue;
10738 if (!(set->flags & NFT_SET_MAP) ||
10739 set->dtype != NFT_DATA_VERDICT)
10740 continue;
10741
10742 list_for_each_entry(binding, &set->bindings, list) {
10743 if (!(binding->flags & NFT_SET_MAP) ||
10744 binding->chain != chain)
10745 continue;
10746
10747 iter.genmask = nft_genmask_next(ctx->net);
10748 iter.skip = 0;
10749 iter.count = 0;
10750 iter.err = 0;
10751 iter.fn = nf_tables_loop_check_setelem;
10752
10753 set->ops->walk(ctx, set, &iter);
10754 if (!iter.err)
10755 iter.err = nft_set_catchall_loops(ctx, set);
10756
10757 if (iter.err < 0)
10758 return iter.err;
10759 }
10760 }
10761
10762 return 0;
10763 }
10764
10765 /**
10766 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10767 *
10768 * @attr: netlink attribute to fetch value from
10769 * @max: maximum value to be stored in dest
10770 * @dest: pointer to the variable
10771 *
10772 * Parse, check and store a given u32 netlink attribute into variable.
10773 * This function returns -ERANGE if the value goes over maximum value.
10774 * Otherwise a 0 is returned and the attribute value is stored in the
10775 * destination variable.
10776 */
nft_parse_u32_check(const struct nlattr * attr,int max,u32 * dest)10777 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10778 {
10779 u32 val;
10780
10781 val = ntohl(nla_get_be32(attr));
10782 if (val > max)
10783 return -ERANGE;
10784
10785 *dest = val;
10786 return 0;
10787 }
10788 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10789
nft_parse_register(const struct nlattr * attr,u32 * preg)10790 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10791 {
10792 unsigned int reg;
10793
10794 reg = ntohl(nla_get_be32(attr));
10795 switch (reg) {
10796 case NFT_REG_VERDICT...NFT_REG_4:
10797 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10798 break;
10799 case NFT_REG32_00...NFT_REG32_15:
10800 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10801 break;
10802 default:
10803 return -ERANGE;
10804 }
10805
10806 return 0;
10807 }
10808
10809 /**
10810 * nft_dump_register - dump a register value to a netlink attribute
10811 *
10812 * @skb: socket buffer
10813 * @attr: attribute number
10814 * @reg: register number
10815 *
10816 * Construct a netlink attribute containing the register number. For
10817 * compatibility reasons, register numbers being a multiple of 4 are
10818 * translated to the corresponding 128 bit register numbers.
10819 */
nft_dump_register(struct sk_buff * skb,unsigned int attr,unsigned int reg)10820 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10821 {
10822 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10823 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10824 else
10825 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10826
10827 return nla_put_be32(skb, attr, htonl(reg));
10828 }
10829 EXPORT_SYMBOL_GPL(nft_dump_register);
10830
nft_validate_register_load(enum nft_registers reg,unsigned int len)10831 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10832 {
10833 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10834 return -EINVAL;
10835 if (len == 0)
10836 return -EINVAL;
10837 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10838 return -ERANGE;
10839
10840 return 0;
10841 }
10842
nft_parse_register_load(const struct nlattr * attr,u8 * sreg,u32 len)10843 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10844 {
10845 u32 reg;
10846 int err;
10847
10848 err = nft_parse_register(attr, ®);
10849 if (err < 0)
10850 return err;
10851
10852 err = nft_validate_register_load(reg, len);
10853 if (err < 0)
10854 return err;
10855
10856 *sreg = reg;
10857 return 0;
10858 }
10859 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10860
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)10861 static int nft_validate_register_store(const struct nft_ctx *ctx,
10862 enum nft_registers reg,
10863 const struct nft_data *data,
10864 enum nft_data_types type,
10865 unsigned int len)
10866 {
10867 int err;
10868
10869 switch (reg) {
10870 case NFT_REG_VERDICT:
10871 if (type != NFT_DATA_VERDICT)
10872 return -EINVAL;
10873
10874 if (data != NULL &&
10875 (data->verdict.code == NFT_GOTO ||
10876 data->verdict.code == NFT_JUMP)) {
10877 err = nf_tables_check_loops(ctx, data->verdict.chain);
10878 if (err < 0)
10879 return err;
10880 }
10881
10882 return 0;
10883 default:
10884 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10885 return -EINVAL;
10886 if (len == 0)
10887 return -EINVAL;
10888 if (reg * NFT_REG32_SIZE + len >
10889 sizeof_field(struct nft_regs, data))
10890 return -ERANGE;
10891
10892 if (data != NULL && type != NFT_DATA_VALUE)
10893 return -EINVAL;
10894 return 0;
10895 }
10896 }
10897
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)10898 int nft_parse_register_store(const struct nft_ctx *ctx,
10899 const struct nlattr *attr, u8 *dreg,
10900 const struct nft_data *data,
10901 enum nft_data_types type, unsigned int len)
10902 {
10903 int err;
10904 u32 reg;
10905
10906 err = nft_parse_register(attr, ®);
10907 if (err < 0)
10908 return err;
10909
10910 err = nft_validate_register_store(ctx, reg, data, type, len);
10911 if (err < 0)
10912 return err;
10913
10914 *dreg = reg;
10915 return 0;
10916 }
10917 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10918
10919 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10920 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10921 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10922 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10923 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10924 };
10925
nft_verdict_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10926 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10927 struct nft_data_desc *desc, const struct nlattr *nla)
10928 {
10929 u8 genmask = nft_genmask_next(ctx->net);
10930 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10931 struct nft_chain *chain;
10932 int err;
10933
10934 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10935 nft_verdict_policy, NULL);
10936 if (err < 0)
10937 return err;
10938
10939 if (!tb[NFTA_VERDICT_CODE])
10940 return -EINVAL;
10941
10942 /* zero padding hole for memcmp */
10943 memset(data, 0, sizeof(*data));
10944 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10945
10946 switch (data->verdict.code) {
10947 case NF_ACCEPT:
10948 case NF_DROP:
10949 case NF_QUEUE:
10950 break;
10951 case NFT_CONTINUE:
10952 case NFT_BREAK:
10953 case NFT_RETURN:
10954 break;
10955 case NFT_JUMP:
10956 case NFT_GOTO:
10957 if (tb[NFTA_VERDICT_CHAIN]) {
10958 chain = nft_chain_lookup(ctx->net, ctx->table,
10959 tb[NFTA_VERDICT_CHAIN],
10960 genmask);
10961 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10962 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10963 tb[NFTA_VERDICT_CHAIN_ID],
10964 genmask);
10965 if (IS_ERR(chain))
10966 return PTR_ERR(chain);
10967 } else {
10968 return -EINVAL;
10969 }
10970
10971 if (IS_ERR(chain))
10972 return PTR_ERR(chain);
10973 if (nft_is_base_chain(chain))
10974 return -EOPNOTSUPP;
10975 if (nft_chain_is_bound(chain))
10976 return -EINVAL;
10977 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10978 chain->flags & NFT_CHAIN_BINDING)
10979 return -EINVAL;
10980 if (!nft_use_inc(&chain->use))
10981 return -EMFILE;
10982
10983 data->verdict.chain = chain;
10984 break;
10985 default:
10986 return -EINVAL;
10987 }
10988
10989 desc->len = sizeof(data->verdict);
10990
10991 return 0;
10992 }
10993
nft_verdict_uninit(const struct nft_data * data)10994 static void nft_verdict_uninit(const struct nft_data *data)
10995 {
10996 struct nft_chain *chain;
10997
10998 switch (data->verdict.code) {
10999 case NFT_JUMP:
11000 case NFT_GOTO:
11001 chain = data->verdict.chain;
11002 nft_use_dec(&chain->use);
11003 break;
11004 }
11005 }
11006
nft_verdict_dump(struct sk_buff * skb,int type,const struct nft_verdict * v)11007 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11008 {
11009 struct nlattr *nest;
11010
11011 nest = nla_nest_start_noflag(skb, type);
11012 if (!nest)
11013 goto nla_put_failure;
11014
11015 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11016 goto nla_put_failure;
11017
11018 switch (v->code) {
11019 case NFT_JUMP:
11020 case NFT_GOTO:
11021 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11022 v->chain->name))
11023 goto nla_put_failure;
11024 }
11025 nla_nest_end(skb, nest);
11026 return 0;
11027
11028 nla_put_failure:
11029 return -1;
11030 }
11031
nft_value_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)11032 static int nft_value_init(const struct nft_ctx *ctx,
11033 struct nft_data *data, struct nft_data_desc *desc,
11034 const struct nlattr *nla)
11035 {
11036 unsigned int len;
11037
11038 len = nla_len(nla);
11039 if (len == 0)
11040 return -EINVAL;
11041 if (len > desc->size)
11042 return -EOVERFLOW;
11043 if (desc->len) {
11044 if (len != desc->len)
11045 return -EINVAL;
11046 } else {
11047 desc->len = len;
11048 }
11049
11050 nla_memcpy(data->data, nla, len);
11051
11052 return 0;
11053 }
11054
nft_value_dump(struct sk_buff * skb,const struct nft_data * data,unsigned int len)11055 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11056 unsigned int len)
11057 {
11058 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11059 }
11060
11061 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11062 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
11063 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
11064 };
11065
11066 /**
11067 * nft_data_init - parse nf_tables data netlink attributes
11068 *
11069 * @ctx: context of the expression using the data
11070 * @data: destination struct nft_data
11071 * @desc: data description
11072 * @nla: netlink attribute containing data
11073 *
11074 * Parse the netlink data attributes and initialize a struct nft_data.
11075 * The type and length of data are returned in the data description.
11076 *
11077 * The caller can indicate that it only wants to accept data of type
11078 * NFT_DATA_VALUE by passing NULL for the ctx argument.
11079 */
nft_data_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)11080 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11081 struct nft_data_desc *desc, const struct nlattr *nla)
11082 {
11083 struct nlattr *tb[NFTA_DATA_MAX + 1];
11084 int err;
11085
11086 if (WARN_ON_ONCE(!desc->size))
11087 return -EINVAL;
11088
11089 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11090 nft_data_policy, NULL);
11091 if (err < 0)
11092 return err;
11093
11094 if (tb[NFTA_DATA_VALUE]) {
11095 if (desc->type != NFT_DATA_VALUE)
11096 return -EINVAL;
11097
11098 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11099 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11100 if (desc->type != NFT_DATA_VERDICT)
11101 return -EINVAL;
11102
11103 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11104 } else {
11105 err = -EINVAL;
11106 }
11107
11108 return err;
11109 }
11110 EXPORT_SYMBOL_GPL(nft_data_init);
11111
11112 /**
11113 * nft_data_release - release a nft_data item
11114 *
11115 * @data: struct nft_data to release
11116 * @type: type of data
11117 *
11118 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11119 * all others need to be released by calling this function.
11120 */
nft_data_release(const struct nft_data * data,enum nft_data_types type)11121 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11122 {
11123 if (type < NFT_DATA_VERDICT)
11124 return;
11125 switch (type) {
11126 case NFT_DATA_VERDICT:
11127 return nft_verdict_uninit(data);
11128 default:
11129 WARN_ON(1);
11130 }
11131 }
11132 EXPORT_SYMBOL_GPL(nft_data_release);
11133
nft_data_dump(struct sk_buff * skb,int attr,const struct nft_data * data,enum nft_data_types type,unsigned int len)11134 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11135 enum nft_data_types type, unsigned int len)
11136 {
11137 struct nlattr *nest;
11138 int err;
11139
11140 nest = nla_nest_start_noflag(skb, attr);
11141 if (nest == NULL)
11142 return -1;
11143
11144 switch (type) {
11145 case NFT_DATA_VALUE:
11146 err = nft_value_dump(skb, data, len);
11147 break;
11148 case NFT_DATA_VERDICT:
11149 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11150 break;
11151 default:
11152 err = -EINVAL;
11153 WARN_ON(1);
11154 }
11155
11156 nla_nest_end(skb, nest);
11157 return err;
11158 }
11159 EXPORT_SYMBOL_GPL(nft_data_dump);
11160
__nft_release_basechain(struct nft_ctx * ctx)11161 int __nft_release_basechain(struct nft_ctx *ctx)
11162 {
11163 struct nft_rule *rule, *nr;
11164
11165 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11166 return 0;
11167
11168 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11169 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11170 list_del(&rule->list);
11171 nft_use_dec(&ctx->chain->use);
11172 nf_tables_rule_release(ctx, rule);
11173 }
11174 nft_chain_del(ctx->chain);
11175 nft_use_dec(&ctx->table->use);
11176 nf_tables_chain_destroy(ctx);
11177
11178 return 0;
11179 }
11180 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11181
__nft_release_hook(struct net * net,struct nft_table * table)11182 static void __nft_release_hook(struct net *net, struct nft_table *table)
11183 {
11184 struct nft_flowtable *flowtable;
11185 struct nft_chain *chain;
11186
11187 list_for_each_entry(chain, &table->chains, list)
11188 __nf_tables_unregister_hook(net, table, chain, true);
11189 list_for_each_entry(flowtable, &table->flowtables, list)
11190 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11191 true);
11192 }
11193
__nft_release_hooks(struct net * net)11194 static void __nft_release_hooks(struct net *net)
11195 {
11196 struct nftables_pernet *nft_net = nft_pernet(net);
11197 struct nft_table *table;
11198
11199 list_for_each_entry(table, &nft_net->tables, list) {
11200 if (nft_table_has_owner(table))
11201 continue;
11202
11203 __nft_release_hook(net, table);
11204 }
11205 }
11206
__nft_release_table(struct net * net,struct nft_table * table)11207 static void __nft_release_table(struct net *net, struct nft_table *table)
11208 {
11209 struct nft_flowtable *flowtable, *nf;
11210 struct nft_chain *chain, *nc;
11211 struct nft_object *obj, *ne;
11212 struct nft_rule *rule, *nr;
11213 struct nft_set *set, *ns;
11214 struct nft_ctx ctx = {
11215 .net = net,
11216 .family = NFPROTO_NETDEV,
11217 };
11218
11219 ctx.family = table->family;
11220 ctx.table = table;
11221 list_for_each_entry(chain, &table->chains, list) {
11222 if (nft_chain_binding(chain))
11223 continue;
11224
11225 ctx.chain = chain;
11226 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11227 list_del(&rule->list);
11228 nft_use_dec(&chain->use);
11229 nf_tables_rule_release(&ctx, rule);
11230 }
11231 }
11232 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11233 list_del(&flowtable->list);
11234 nft_use_dec(&table->use);
11235 nf_tables_flowtable_destroy(flowtable);
11236 }
11237 list_for_each_entry_safe(set, ns, &table->sets, list) {
11238 list_del(&set->list);
11239 nft_use_dec(&table->use);
11240 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11241 nft_map_deactivate(&ctx, set);
11242
11243 nft_set_destroy(&ctx, set);
11244 }
11245 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11246 nft_obj_del(obj);
11247 nft_use_dec(&table->use);
11248 nft_obj_destroy(&ctx, obj);
11249 }
11250 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11251 ctx.chain = chain;
11252 nft_chain_del(chain);
11253 nft_use_dec(&table->use);
11254 nf_tables_chain_destroy(&ctx);
11255 }
11256 nf_tables_table_destroy(&ctx);
11257 }
11258
__nft_release_tables(struct net * net)11259 static void __nft_release_tables(struct net *net)
11260 {
11261 struct nftables_pernet *nft_net = nft_pernet(net);
11262 struct nft_table *table, *nt;
11263
11264 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11265 if (nft_table_has_owner(table))
11266 continue;
11267
11268 list_del(&table->list);
11269
11270 __nft_release_table(net, table);
11271 }
11272 }
11273
nft_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)11274 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11275 void *ptr)
11276 {
11277 struct nft_table *table, *to_delete[8];
11278 struct nftables_pernet *nft_net;
11279 struct netlink_notify *n = ptr;
11280 struct net *net = n->net;
11281 unsigned int deleted;
11282 bool restart = false;
11283 unsigned int gc_seq;
11284
11285 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11286 return NOTIFY_DONE;
11287
11288 nft_net = nft_pernet(net);
11289 deleted = 0;
11290 mutex_lock(&nft_net->commit_mutex);
11291
11292 gc_seq = nft_gc_seq_begin(nft_net);
11293
11294 if (!list_empty(&nf_tables_destroy_list))
11295 nf_tables_trans_destroy_flush_work();
11296 again:
11297 list_for_each_entry(table, &nft_net->tables, list) {
11298 if (nft_table_has_owner(table) &&
11299 n->portid == table->nlpid) {
11300 __nft_release_hook(net, table);
11301 list_del_rcu(&table->list);
11302 to_delete[deleted++] = table;
11303 if (deleted >= ARRAY_SIZE(to_delete))
11304 break;
11305 }
11306 }
11307 if (deleted) {
11308 restart = deleted >= ARRAY_SIZE(to_delete);
11309 synchronize_rcu();
11310 while (deleted)
11311 __nft_release_table(net, to_delete[--deleted]);
11312
11313 if (restart)
11314 goto again;
11315 }
11316 nft_gc_seq_end(nft_net, gc_seq);
11317
11318 mutex_unlock(&nft_net->commit_mutex);
11319
11320 return NOTIFY_DONE;
11321 }
11322
11323 static struct notifier_block nft_nl_notifier = {
11324 .notifier_call = nft_rcv_nl_event,
11325 };
11326
nf_tables_init_net(struct net * net)11327 static int __net_init nf_tables_init_net(struct net *net)
11328 {
11329 struct nftables_pernet *nft_net = nft_pernet(net);
11330
11331 INIT_LIST_HEAD(&nft_net->tables);
11332 INIT_LIST_HEAD(&nft_net->commit_list);
11333 INIT_LIST_HEAD(&nft_net->binding_list);
11334 INIT_LIST_HEAD(&nft_net->module_list);
11335 INIT_LIST_HEAD(&nft_net->notify_list);
11336 mutex_init(&nft_net->commit_mutex);
11337 nft_net->base_seq = 1;
11338 nft_net->gc_seq = 0;
11339 nft_net->validate_state = NFT_VALIDATE_SKIP;
11340
11341 return 0;
11342 }
11343
nf_tables_pre_exit_net(struct net * net)11344 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11345 {
11346 struct nftables_pernet *nft_net = nft_pernet(net);
11347
11348 mutex_lock(&nft_net->commit_mutex);
11349 __nft_release_hooks(net);
11350 mutex_unlock(&nft_net->commit_mutex);
11351 }
11352
nf_tables_exit_net(struct net * net)11353 static void __net_exit nf_tables_exit_net(struct net *net)
11354 {
11355 struct nftables_pernet *nft_net = nft_pernet(net);
11356 unsigned int gc_seq;
11357
11358 mutex_lock(&nft_net->commit_mutex);
11359
11360 gc_seq = nft_gc_seq_begin(nft_net);
11361
11362 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11363
11364 if (!list_empty(&nft_net->module_list))
11365 nf_tables_module_autoload_cleanup(net);
11366
11367 __nft_release_tables(net);
11368
11369 nft_gc_seq_end(nft_net, gc_seq);
11370
11371 mutex_unlock(&nft_net->commit_mutex);
11372 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11373 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11374 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11375 }
11376
nf_tables_exit_batch(struct list_head * net_exit_list)11377 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11378 {
11379 flush_work(&trans_gc_work);
11380 }
11381
11382 static struct pernet_operations nf_tables_net_ops = {
11383 .init = nf_tables_init_net,
11384 .pre_exit = nf_tables_pre_exit_net,
11385 .exit = nf_tables_exit_net,
11386 .exit_batch = nf_tables_exit_batch,
11387 .id = &nf_tables_net_id,
11388 .size = sizeof(struct nftables_pernet),
11389 };
11390
nf_tables_module_init(void)11391 static int __init nf_tables_module_init(void)
11392 {
11393 int err;
11394
11395 err = register_pernet_subsys(&nf_tables_net_ops);
11396 if (err < 0)
11397 return err;
11398
11399 err = nft_chain_filter_init();
11400 if (err < 0)
11401 goto err_chain_filter;
11402
11403 err = nf_tables_core_module_init();
11404 if (err < 0)
11405 goto err_core_module;
11406
11407 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11408 if (err < 0)
11409 goto err_netdev_notifier;
11410
11411 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11412 if (err < 0)
11413 goto err_rht_objname;
11414
11415 err = nft_offload_init();
11416 if (err < 0)
11417 goto err_offload;
11418
11419 err = netlink_register_notifier(&nft_nl_notifier);
11420 if (err < 0)
11421 goto err_netlink_notifier;
11422
11423 /* must be last */
11424 err = nfnetlink_subsys_register(&nf_tables_subsys);
11425 if (err < 0)
11426 goto err_nfnl_subsys;
11427
11428 nft_chain_route_init();
11429
11430 return err;
11431
11432 err_nfnl_subsys:
11433 netlink_unregister_notifier(&nft_nl_notifier);
11434 err_netlink_notifier:
11435 nft_offload_exit();
11436 err_offload:
11437 rhltable_destroy(&nft_objname_ht);
11438 err_rht_objname:
11439 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11440 err_netdev_notifier:
11441 nf_tables_core_module_exit();
11442 err_core_module:
11443 nft_chain_filter_fini();
11444 err_chain_filter:
11445 unregister_pernet_subsys(&nf_tables_net_ops);
11446 return err;
11447 }
11448
nf_tables_module_exit(void)11449 static void __exit nf_tables_module_exit(void)
11450 {
11451 nfnetlink_subsys_unregister(&nf_tables_subsys);
11452 netlink_unregister_notifier(&nft_nl_notifier);
11453 nft_offload_exit();
11454 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11455 nft_chain_filter_fini();
11456 nft_chain_route_fini();
11457 nf_tables_trans_destroy_flush_work();
11458 unregister_pernet_subsys(&nf_tables_net_ops);
11459 cancel_work_sync(&trans_gc_work);
11460 cancel_work_sync(&trans_destroy_work);
11461 rcu_barrier();
11462 rhltable_destroy(&nft_objname_ht);
11463 nf_tables_core_module_exit();
11464 }
11465
11466 module_init(nf_tables_module_init);
11467 module_exit(nf_tables_module_exit);
11468
11469 MODULE_LICENSE("GPL");
11470 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11471 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
11472