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 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
598
599 if (!nft_set_elem_active(ext, iter->genmask))
600 return 0;
601
602 nft_set_elem_change_active(ctx->net, set, ext);
603 nft_setelem_data_deactivate(ctx->net, set, elem);
604
605 return 0;
606 }
607
608 struct nft_set_elem_catchall {
609 struct list_head list;
610 struct rcu_head rcu;
611 void *elem;
612 };
613
nft_map_catchall_deactivate(const struct nft_ctx * ctx,struct nft_set * set)614 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
615 struct nft_set *set)
616 {
617 u8 genmask = nft_genmask_next(ctx->net);
618 struct nft_set_elem_catchall *catchall;
619 struct nft_set_elem elem;
620 struct nft_set_ext *ext;
621
622 list_for_each_entry(catchall, &set->catchall_list, list) {
623 ext = nft_set_elem_ext(set, catchall->elem);
624 if (!nft_set_elem_active(ext, genmask))
625 continue;
626
627 elem.priv = catchall->elem;
628 nft_set_elem_change_active(ctx->net, set, ext);
629 nft_setelem_data_deactivate(ctx->net, set, &elem);
630 break;
631 }
632 }
633
nft_map_deactivate(const struct nft_ctx * ctx,struct nft_set * set)634 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
635 {
636 struct nft_set_iter iter = {
637 .genmask = nft_genmask_next(ctx->net),
638 .type = NFT_ITER_UPDATE,
639 .fn = nft_mapelem_deactivate,
640 };
641
642 set->ops->walk(ctx, set, &iter);
643 WARN_ON_ONCE(iter.err);
644
645 nft_map_catchall_deactivate(ctx, set);
646 }
647
nft_delset(const struct nft_ctx * ctx,struct nft_set * set)648 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
649 {
650 int err;
651
652 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
653 if (err < 0)
654 return err;
655
656 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
657 nft_map_deactivate(ctx, set);
658
659 nft_deactivate_next(ctx->net, set);
660 nft_use_dec(&ctx->table->use);
661
662 return err;
663 }
664
nft_trans_obj_add(struct nft_ctx * ctx,int msg_type,struct nft_object * obj)665 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
666 struct nft_object *obj)
667 {
668 struct nft_trans *trans;
669
670 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
671 if (trans == NULL)
672 return -ENOMEM;
673
674 if (msg_type == NFT_MSG_NEWOBJ)
675 nft_activate_next(ctx->net, obj);
676
677 nft_trans_obj(trans) = obj;
678 nft_trans_commit_list_add_tail(ctx->net, trans);
679
680 return 0;
681 }
682
nft_delobj(struct nft_ctx * ctx,struct nft_object * obj)683 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
684 {
685 int err;
686
687 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
688 if (err < 0)
689 return err;
690
691 nft_deactivate_next(ctx->net, obj);
692 nft_use_dec(&ctx->table->use);
693
694 return err;
695 }
696
697 static struct nft_trans *
nft_trans_flowtable_add(struct nft_ctx * ctx,int msg_type,struct nft_flowtable * flowtable)698 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
699 struct nft_flowtable *flowtable)
700 {
701 struct nft_trans *trans;
702
703 trans = nft_trans_alloc(ctx, msg_type,
704 sizeof(struct nft_trans_flowtable));
705 if (trans == NULL)
706 return ERR_PTR(-ENOMEM);
707
708 if (msg_type == NFT_MSG_NEWFLOWTABLE)
709 nft_activate_next(ctx->net, flowtable);
710
711 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
712 nft_trans_flowtable(trans) = flowtable;
713 nft_trans_commit_list_add_tail(ctx->net, trans);
714
715 return trans;
716 }
717
nft_delflowtable(struct nft_ctx * ctx,struct nft_flowtable * flowtable)718 static int nft_delflowtable(struct nft_ctx *ctx,
719 struct nft_flowtable *flowtable)
720 {
721 struct nft_trans *trans;
722
723 trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
724 if (IS_ERR(trans))
725 return PTR_ERR(trans);
726
727 nft_deactivate_next(ctx->net, flowtable);
728 nft_use_dec(&ctx->table->use);
729
730 return 0;
731 }
732
__nft_reg_track_clobber(struct nft_regs_track * track,u8 dreg)733 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
734 {
735 int i;
736
737 for (i = track->regs[dreg].num_reg; i > 0; i--)
738 __nft_reg_track_cancel(track, dreg - i);
739 }
740
__nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 num_reg)741 static void __nft_reg_track_update(struct nft_regs_track *track,
742 const struct nft_expr *expr,
743 u8 dreg, u8 num_reg)
744 {
745 track->regs[dreg].selector = expr;
746 track->regs[dreg].bitwise = NULL;
747 track->regs[dreg].num_reg = num_reg;
748 }
749
nft_reg_track_update(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg,u8 len)750 void nft_reg_track_update(struct nft_regs_track *track,
751 const struct nft_expr *expr, u8 dreg, u8 len)
752 {
753 unsigned int regcount;
754 int i;
755
756 __nft_reg_track_clobber(track, dreg);
757
758 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
759 for (i = 0; i < regcount; i++, dreg++)
760 __nft_reg_track_update(track, expr, dreg, i);
761 }
762 EXPORT_SYMBOL_GPL(nft_reg_track_update);
763
nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg,u8 len)764 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
765 {
766 unsigned int regcount;
767 int i;
768
769 __nft_reg_track_clobber(track, dreg);
770
771 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
772 for (i = 0; i < regcount; i++, dreg++)
773 __nft_reg_track_cancel(track, dreg);
774 }
775 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
776
__nft_reg_track_cancel(struct nft_regs_track * track,u8 dreg)777 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
778 {
779 track->regs[dreg].selector = NULL;
780 track->regs[dreg].bitwise = NULL;
781 track->regs[dreg].num_reg = 0;
782 }
783 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
784
785 /*
786 * Tables
787 */
788
nft_table_lookup(const struct net * net,const struct nlattr * nla,u8 family,u8 genmask,u32 nlpid)789 static struct nft_table *nft_table_lookup(const struct net *net,
790 const struct nlattr *nla,
791 u8 family, u8 genmask, u32 nlpid)
792 {
793 struct nftables_pernet *nft_net;
794 struct nft_table *table;
795
796 if (nla == NULL)
797 return ERR_PTR(-EINVAL);
798
799 nft_net = nft_pernet(net);
800 list_for_each_entry_rcu(table, &nft_net->tables, list,
801 lockdep_is_held(&nft_net->commit_mutex)) {
802 if (!nla_strcmp(nla, table->name) &&
803 table->family == family &&
804 nft_active_genmask(table, genmask)) {
805 if (nft_table_has_owner(table) &&
806 nlpid && table->nlpid != nlpid)
807 return ERR_PTR(-EPERM);
808
809 return table;
810 }
811 }
812
813 return ERR_PTR(-ENOENT);
814 }
815
nft_table_lookup_byhandle(const struct net * net,const struct nlattr * nla,int family,u8 genmask,u32 nlpid)816 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
817 const struct nlattr *nla,
818 int family, u8 genmask, u32 nlpid)
819 {
820 struct nftables_pernet *nft_net;
821 struct nft_table *table;
822
823 nft_net = nft_pernet(net);
824 list_for_each_entry(table, &nft_net->tables, list) {
825 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
826 table->family == family &&
827 nft_active_genmask(table, genmask)) {
828 if (nft_table_has_owner(table) &&
829 nlpid && table->nlpid != nlpid)
830 return ERR_PTR(-EPERM);
831
832 return table;
833 }
834 }
835
836 return ERR_PTR(-ENOENT);
837 }
838
nf_tables_alloc_handle(struct nft_table * table)839 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
840 {
841 return ++table->hgenerator;
842 }
843
844 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
845
846 static const struct nft_chain_type *
__nft_chain_type_get(u8 family,enum nft_chain_types type)847 __nft_chain_type_get(u8 family, enum nft_chain_types type)
848 {
849 if (family >= NFPROTO_NUMPROTO ||
850 type >= NFT_CHAIN_T_MAX)
851 return NULL;
852
853 return chain_type[family][type];
854 }
855
856 static const struct nft_chain_type *
__nf_tables_chain_type_lookup(const struct nlattr * nla,u8 family)857 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
858 {
859 const struct nft_chain_type *type;
860 int i;
861
862 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
863 type = __nft_chain_type_get(family, i);
864 if (!type)
865 continue;
866 if (!nla_strcmp(nla, type->name))
867 return type;
868 }
869 return NULL;
870 }
871
872 struct nft_module_request {
873 struct list_head list;
874 char module[MODULE_NAME_LEN];
875 bool done;
876 };
877
878 #ifdef CONFIG_MODULES
nft_request_module(struct net * net,const char * fmt,...)879 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
880 ...)
881 {
882 char module_name[MODULE_NAME_LEN];
883 struct nftables_pernet *nft_net;
884 struct nft_module_request *req;
885 va_list args;
886 int ret;
887
888 va_start(args, fmt);
889 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
890 va_end(args);
891 if (ret >= MODULE_NAME_LEN)
892 return 0;
893
894 nft_net = nft_pernet(net);
895 list_for_each_entry(req, &nft_net->module_list, list) {
896 if (!strcmp(req->module, module_name)) {
897 if (req->done)
898 return 0;
899
900 /* A request to load this module already exists. */
901 return -EAGAIN;
902 }
903 }
904
905 req = kmalloc(sizeof(*req), GFP_KERNEL);
906 if (!req)
907 return -ENOMEM;
908
909 req->done = false;
910 strscpy(req->module, module_name, MODULE_NAME_LEN);
911 list_add_tail(&req->list, &nft_net->module_list);
912
913 return -EAGAIN;
914 }
915 EXPORT_SYMBOL_GPL(nft_request_module);
916 #endif
917
lockdep_nfnl_nft_mutex_not_held(void)918 static void lockdep_nfnl_nft_mutex_not_held(void)
919 {
920 #ifdef CONFIG_PROVE_LOCKING
921 if (debug_locks)
922 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
923 #endif
924 }
925
926 static const struct nft_chain_type *
nf_tables_chain_type_lookup(struct net * net,const struct nlattr * nla,u8 family,bool autoload)927 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
928 u8 family, bool autoload)
929 {
930 const struct nft_chain_type *type;
931
932 type = __nf_tables_chain_type_lookup(nla, family);
933 if (type != NULL)
934 return type;
935
936 lockdep_nfnl_nft_mutex_not_held();
937 #ifdef CONFIG_MODULES
938 if (autoload) {
939 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
940 nla_len(nla),
941 (const char *)nla_data(nla)) == -EAGAIN)
942 return ERR_PTR(-EAGAIN);
943 }
944 #endif
945 return ERR_PTR(-ENOENT);
946 }
947
nft_base_seq(const struct net * net)948 static __be16 nft_base_seq(const struct net *net)
949 {
950 struct nftables_pernet *nft_net = nft_pernet(net);
951
952 return htons(nft_net->base_seq & 0xffff);
953 }
954
955 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
956 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
957 .len = NFT_TABLE_MAXNAMELEN - 1 },
958 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
959 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
960 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
961 .len = NFT_USERDATA_MAXLEN }
962 };
963
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)964 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
965 u32 portid, u32 seq, int event, u32 flags,
966 int family, const struct nft_table *table)
967 {
968 struct nlmsghdr *nlh;
969
970 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
971 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
972 NFNETLINK_V0, nft_base_seq(net));
973 if (!nlh)
974 goto nla_put_failure;
975
976 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
977 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
978 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
979 NFTA_TABLE_PAD))
980 goto nla_put_failure;
981
982 if (event == NFT_MSG_DELTABLE) {
983 nlmsg_end(skb, nlh);
984 return 0;
985 }
986
987 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
988 htonl(table->flags & NFT_TABLE_F_MASK)))
989 goto nla_put_failure;
990
991 if (nft_table_has_owner(table) &&
992 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
993 goto nla_put_failure;
994
995 if (table->udata) {
996 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
997 goto nla_put_failure;
998 }
999
1000 nlmsg_end(skb, nlh);
1001 return 0;
1002
1003 nla_put_failure:
1004 nlmsg_trim(skb, nlh);
1005 return -1;
1006 }
1007
1008 struct nftnl_skb_parms {
1009 bool report;
1010 };
1011 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1012
nft_notify_enqueue(struct sk_buff * skb,bool report,struct list_head * notify_list)1013 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1014 struct list_head *notify_list)
1015 {
1016 NFT_CB(skb).report = report;
1017 list_add_tail(&skb->list, notify_list);
1018 }
1019
nf_tables_table_notify(const struct nft_ctx * ctx,int event)1020 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1021 {
1022 struct nftables_pernet *nft_net;
1023 struct sk_buff *skb;
1024 u16 flags = 0;
1025 int err;
1026
1027 if (!ctx->report &&
1028 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1029 return;
1030
1031 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1032 if (skb == NULL)
1033 goto err;
1034
1035 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1036 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1037
1038 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1039 event, flags, ctx->family, ctx->table);
1040 if (err < 0) {
1041 kfree_skb(skb);
1042 goto err;
1043 }
1044
1045 nft_net = nft_pernet(ctx->net);
1046 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1047 return;
1048 err:
1049 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1050 }
1051
nf_tables_dump_tables(struct sk_buff * skb,struct netlink_callback * cb)1052 static int nf_tables_dump_tables(struct sk_buff *skb,
1053 struct netlink_callback *cb)
1054 {
1055 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1056 struct nftables_pernet *nft_net;
1057 const struct nft_table *table;
1058 unsigned int idx = 0, s_idx = cb->args[0];
1059 struct net *net = sock_net(skb->sk);
1060 int family = nfmsg->nfgen_family;
1061
1062 rcu_read_lock();
1063 nft_net = nft_pernet(net);
1064 cb->seq = READ_ONCE(nft_net->base_seq);
1065
1066 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1067 if (family != NFPROTO_UNSPEC && family != table->family)
1068 continue;
1069
1070 if (idx < s_idx)
1071 goto cont;
1072 if (idx > s_idx)
1073 memset(&cb->args[1], 0,
1074 sizeof(cb->args) - sizeof(cb->args[0]));
1075 if (!nft_is_active(net, table))
1076 continue;
1077 if (nf_tables_fill_table_info(skb, net,
1078 NETLINK_CB(cb->skb).portid,
1079 cb->nlh->nlmsg_seq,
1080 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1081 table->family, table) < 0)
1082 goto done;
1083
1084 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1085 cont:
1086 idx++;
1087 }
1088 done:
1089 rcu_read_unlock();
1090 cb->args[0] = idx;
1091 return skb->len;
1092 }
1093
nft_netlink_dump_start_rcu(struct sock * nlsk,struct sk_buff * skb,const struct nlmsghdr * nlh,struct netlink_dump_control * c)1094 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1095 const struct nlmsghdr *nlh,
1096 struct netlink_dump_control *c)
1097 {
1098 int err;
1099
1100 if (!try_module_get(THIS_MODULE))
1101 return -EINVAL;
1102
1103 rcu_read_unlock();
1104 err = netlink_dump_start(nlsk, skb, nlh, c);
1105 rcu_read_lock();
1106 module_put(THIS_MODULE);
1107
1108 return err;
1109 }
1110
1111 /* called with rcu_read_lock held */
nf_tables_gettable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1112 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1113 const struct nlattr * const nla[])
1114 {
1115 struct netlink_ext_ack *extack = info->extack;
1116 u8 genmask = nft_genmask_cur(info->net);
1117 u8 family = info->nfmsg->nfgen_family;
1118 const struct nft_table *table;
1119 struct net *net = info->net;
1120 struct sk_buff *skb2;
1121 int err;
1122
1123 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1124 struct netlink_dump_control c = {
1125 .dump = nf_tables_dump_tables,
1126 .module = THIS_MODULE,
1127 };
1128
1129 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1130 }
1131
1132 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1133 if (IS_ERR(table)) {
1134 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1135 return PTR_ERR(table);
1136 }
1137
1138 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1139 if (!skb2)
1140 return -ENOMEM;
1141
1142 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1143 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1144 0, family, table);
1145 if (err < 0)
1146 goto err_fill_table_info;
1147
1148 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1149
1150 err_fill_table_info:
1151 kfree_skb(skb2);
1152 return err;
1153 }
1154
nft_table_disable(struct net * net,struct nft_table * table,u32 cnt)1155 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1156 {
1157 struct nft_chain *chain;
1158 u32 i = 0;
1159
1160 list_for_each_entry(chain, &table->chains, list) {
1161 if (!nft_is_active_next(net, chain))
1162 continue;
1163 if (!nft_is_base_chain(chain))
1164 continue;
1165
1166 if (cnt && i++ == cnt)
1167 break;
1168
1169 nf_tables_unregister_hook(net, table, chain);
1170 }
1171 }
1172
nf_tables_table_enable(struct net * net,struct nft_table * table)1173 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1174 {
1175 struct nft_chain *chain;
1176 int err, i = 0;
1177
1178 list_for_each_entry(chain, &table->chains, list) {
1179 if (!nft_is_active_next(net, chain))
1180 continue;
1181 if (!nft_is_base_chain(chain))
1182 continue;
1183
1184 err = nf_tables_register_hook(net, table, chain);
1185 if (err < 0)
1186 goto err_register_hooks;
1187
1188 i++;
1189 }
1190 return 0;
1191
1192 err_register_hooks:
1193 if (i)
1194 nft_table_disable(net, table, i);
1195 return err;
1196 }
1197
nf_tables_table_disable(struct net * net,struct nft_table * table)1198 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1199 {
1200 table->flags &= ~NFT_TABLE_F_DORMANT;
1201 nft_table_disable(net, table, 0);
1202 table->flags |= NFT_TABLE_F_DORMANT;
1203 }
1204
1205 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1206 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1207 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1208 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1209 __NFT_TABLE_F_WAS_AWAKEN)
1210
nft_table_pending_update(const struct nft_ctx * ctx)1211 static bool nft_table_pending_update(const struct nft_ctx *ctx)
1212 {
1213 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1214 struct nft_trans *trans;
1215
1216 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1217 return true;
1218
1219 list_for_each_entry(trans, &nft_net->commit_list, list) {
1220 if (trans->ctx.table == ctx->table &&
1221 ((trans->msg_type == NFT_MSG_NEWCHAIN &&
1222 nft_trans_chain_update(trans)) ||
1223 (trans->msg_type == NFT_MSG_DELCHAIN &&
1224 nft_is_base_chain(trans->ctx.chain))))
1225 return true;
1226 }
1227
1228 return false;
1229 }
1230
nf_tables_updtable(struct nft_ctx * ctx)1231 static int nf_tables_updtable(struct nft_ctx *ctx)
1232 {
1233 struct nft_trans *trans;
1234 u32 flags;
1235 int ret;
1236
1237 if (!ctx->nla[NFTA_TABLE_FLAGS])
1238 return 0;
1239
1240 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1241 if (flags & ~NFT_TABLE_F_MASK)
1242 return -EOPNOTSUPP;
1243
1244 if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1245 return 0;
1246
1247 if ((nft_table_has_owner(ctx->table) &&
1248 !(flags & NFT_TABLE_F_OWNER)) ||
1249 (!nft_table_has_owner(ctx->table) &&
1250 flags & NFT_TABLE_F_OWNER))
1251 return -EOPNOTSUPP;
1252
1253 /* No dormant off/on/off/on games in single transaction */
1254 if (nft_table_pending_update(ctx))
1255 return -EINVAL;
1256
1257 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1258 sizeof(struct nft_trans_table));
1259 if (trans == NULL)
1260 return -ENOMEM;
1261
1262 if ((flags & NFT_TABLE_F_DORMANT) &&
1263 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1264 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1265 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1266 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1267 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1268 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1269 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1270 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1271 ret = nf_tables_table_enable(ctx->net, ctx->table);
1272 if (ret < 0)
1273 goto err_register_hooks;
1274
1275 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1276 }
1277 }
1278
1279 nft_trans_table_update(trans) = true;
1280 nft_trans_commit_list_add_tail(ctx->net, trans);
1281
1282 return 0;
1283
1284 err_register_hooks:
1285 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1286 nft_trans_destroy(trans);
1287 return ret;
1288 }
1289
nft_chain_hash(const void * data,u32 len,u32 seed)1290 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1291 {
1292 const char *name = data;
1293
1294 return jhash(name, strlen(name), seed);
1295 }
1296
nft_chain_hash_obj(const void * data,u32 len,u32 seed)1297 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1298 {
1299 const struct nft_chain *chain = data;
1300
1301 return nft_chain_hash(chain->name, 0, seed);
1302 }
1303
nft_chain_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1304 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1305 const void *ptr)
1306 {
1307 const struct nft_chain *chain = ptr;
1308 const char *name = arg->key;
1309
1310 return strcmp(chain->name, name);
1311 }
1312
nft_objname_hash(const void * data,u32 len,u32 seed)1313 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1314 {
1315 const struct nft_object_hash_key *k = data;
1316
1317 seed ^= hash_ptr(k->table, 32);
1318
1319 return jhash(k->name, strlen(k->name), seed);
1320 }
1321
nft_objname_hash_obj(const void * data,u32 len,u32 seed)1322 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1323 {
1324 const struct nft_object *obj = data;
1325
1326 return nft_objname_hash(&obj->key, 0, seed);
1327 }
1328
nft_objname_hash_cmp(struct rhashtable_compare_arg * arg,const void * ptr)1329 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1330 const void *ptr)
1331 {
1332 const struct nft_object_hash_key *k = arg->key;
1333 const struct nft_object *obj = ptr;
1334
1335 if (obj->key.table != k->table)
1336 return -1;
1337
1338 return strcmp(obj->key.name, k->name);
1339 }
1340
nft_supported_family(u8 family)1341 static bool nft_supported_family(u8 family)
1342 {
1343 return false
1344 #ifdef CONFIG_NF_TABLES_INET
1345 || family == NFPROTO_INET
1346 #endif
1347 #ifdef CONFIG_NF_TABLES_IPV4
1348 || family == NFPROTO_IPV4
1349 #endif
1350 #ifdef CONFIG_NF_TABLES_ARP
1351 || family == NFPROTO_ARP
1352 #endif
1353 #ifdef CONFIG_NF_TABLES_NETDEV
1354 || family == NFPROTO_NETDEV
1355 #endif
1356 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1357 || family == NFPROTO_BRIDGE
1358 #endif
1359 #ifdef CONFIG_NF_TABLES_IPV6
1360 || family == NFPROTO_IPV6
1361 #endif
1362 ;
1363 }
1364
nf_tables_newtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1365 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1366 const struct nlattr * const nla[])
1367 {
1368 struct nftables_pernet *nft_net = nft_pernet(info->net);
1369 struct netlink_ext_ack *extack = info->extack;
1370 u8 genmask = nft_genmask_next(info->net);
1371 u8 family = info->nfmsg->nfgen_family;
1372 struct net *net = info->net;
1373 const struct nlattr *attr;
1374 struct nft_table *table;
1375 struct nft_ctx ctx;
1376 u32 flags = 0;
1377 int err;
1378
1379 if (!nft_supported_family(family))
1380 return -EOPNOTSUPP;
1381
1382 lockdep_assert_held(&nft_net->commit_mutex);
1383 attr = nla[NFTA_TABLE_NAME];
1384 table = nft_table_lookup(net, attr, family, genmask,
1385 NETLINK_CB(skb).portid);
1386 if (IS_ERR(table)) {
1387 if (PTR_ERR(table) != -ENOENT)
1388 return PTR_ERR(table);
1389 } else {
1390 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1391 NL_SET_BAD_ATTR(extack, attr);
1392 return -EEXIST;
1393 }
1394 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1395 return -EOPNOTSUPP;
1396
1397 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1398
1399 return nf_tables_updtable(&ctx);
1400 }
1401
1402 if (nla[NFTA_TABLE_FLAGS]) {
1403 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1404 if (flags & ~NFT_TABLE_F_MASK)
1405 return -EOPNOTSUPP;
1406 }
1407
1408 err = -ENOMEM;
1409 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1410 if (table == NULL)
1411 goto err_kzalloc;
1412
1413 table->validate_state = nft_net->validate_state;
1414 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1415 if (table->name == NULL)
1416 goto err_strdup;
1417
1418 if (nla[NFTA_TABLE_USERDATA]) {
1419 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1420 if (table->udata == NULL)
1421 goto err_table_udata;
1422
1423 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1424 }
1425
1426 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1427 if (err)
1428 goto err_chain_ht;
1429
1430 INIT_LIST_HEAD(&table->chains);
1431 INIT_LIST_HEAD(&table->sets);
1432 INIT_LIST_HEAD(&table->objects);
1433 INIT_LIST_HEAD(&table->flowtables);
1434 table->family = family;
1435 table->flags = flags;
1436 table->handle = ++nft_net->table_handle;
1437 if (table->flags & NFT_TABLE_F_OWNER)
1438 table->nlpid = NETLINK_CB(skb).portid;
1439
1440 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1441 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1442 if (err < 0)
1443 goto err_trans;
1444
1445 list_add_tail_rcu(&table->list, &nft_net->tables);
1446 return 0;
1447 err_trans:
1448 rhltable_destroy(&table->chains_ht);
1449 err_chain_ht:
1450 kfree(table->udata);
1451 err_table_udata:
1452 kfree(table->name);
1453 err_strdup:
1454 kfree(table);
1455 err_kzalloc:
1456 return err;
1457 }
1458
nft_flush_table(struct nft_ctx * ctx)1459 static int nft_flush_table(struct nft_ctx *ctx)
1460 {
1461 struct nft_flowtable *flowtable, *nft;
1462 struct nft_chain *chain, *nc;
1463 struct nft_object *obj, *ne;
1464 struct nft_set *set, *ns;
1465 int err;
1466
1467 list_for_each_entry(chain, &ctx->table->chains, list) {
1468 if (!nft_is_active_next(ctx->net, chain))
1469 continue;
1470
1471 if (nft_chain_binding(chain))
1472 continue;
1473
1474 ctx->chain = chain;
1475
1476 err = nft_delrule_by_chain(ctx);
1477 if (err < 0)
1478 goto out;
1479 }
1480
1481 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1482 if (!nft_is_active_next(ctx->net, set))
1483 continue;
1484
1485 if (nft_set_is_anonymous(set))
1486 continue;
1487
1488 err = nft_delset(ctx, set);
1489 if (err < 0)
1490 goto out;
1491 }
1492
1493 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1494 if (!nft_is_active_next(ctx->net, flowtable))
1495 continue;
1496
1497 err = nft_delflowtable(ctx, flowtable);
1498 if (err < 0)
1499 goto out;
1500 }
1501
1502 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1503 if (!nft_is_active_next(ctx->net, obj))
1504 continue;
1505
1506 err = nft_delobj(ctx, obj);
1507 if (err < 0)
1508 goto out;
1509 }
1510
1511 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1512 if (!nft_is_active_next(ctx->net, chain))
1513 continue;
1514
1515 if (nft_chain_binding(chain))
1516 continue;
1517
1518 ctx->chain = chain;
1519
1520 err = nft_delchain(ctx);
1521 if (err < 0)
1522 goto out;
1523 }
1524
1525 err = nft_deltable(ctx);
1526 out:
1527 return err;
1528 }
1529
nft_flush(struct nft_ctx * ctx,int family)1530 static int nft_flush(struct nft_ctx *ctx, int family)
1531 {
1532 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1533 const struct nlattr * const *nla = ctx->nla;
1534 struct nft_table *table, *nt;
1535 int err = 0;
1536
1537 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1538 if (family != AF_UNSPEC && table->family != family)
1539 continue;
1540
1541 ctx->family = table->family;
1542
1543 if (!nft_is_active_next(ctx->net, table))
1544 continue;
1545
1546 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1547 continue;
1548
1549 if (nla[NFTA_TABLE_NAME] &&
1550 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1551 continue;
1552
1553 ctx->table = table;
1554
1555 err = nft_flush_table(ctx);
1556 if (err < 0)
1557 goto out;
1558 }
1559 out:
1560 return err;
1561 }
1562
nf_tables_deltable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1563 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1564 const struct nlattr * const nla[])
1565 {
1566 struct netlink_ext_ack *extack = info->extack;
1567 u8 genmask = nft_genmask_next(info->net);
1568 u8 family = info->nfmsg->nfgen_family;
1569 struct net *net = info->net;
1570 const struct nlattr *attr;
1571 struct nft_table *table;
1572 struct nft_ctx ctx;
1573
1574 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1575 if (family == AF_UNSPEC ||
1576 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1577 return nft_flush(&ctx, family);
1578
1579 if (nla[NFTA_TABLE_HANDLE]) {
1580 attr = nla[NFTA_TABLE_HANDLE];
1581 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1582 NETLINK_CB(skb).portid);
1583 } else {
1584 attr = nla[NFTA_TABLE_NAME];
1585 table = nft_table_lookup(net, attr, family, genmask,
1586 NETLINK_CB(skb).portid);
1587 }
1588
1589 if (IS_ERR(table)) {
1590 if (PTR_ERR(table) == -ENOENT &&
1591 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1592 return 0;
1593
1594 NL_SET_BAD_ATTR(extack, attr);
1595 return PTR_ERR(table);
1596 }
1597
1598 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1599 table->use > 0)
1600 return -EBUSY;
1601
1602 ctx.family = family;
1603 ctx.table = table;
1604
1605 return nft_flush_table(&ctx);
1606 }
1607
nf_tables_table_destroy(struct nft_ctx * ctx)1608 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1609 {
1610 if (WARN_ON(ctx->table->use > 0))
1611 return;
1612
1613 rhltable_destroy(&ctx->table->chains_ht);
1614 kfree(ctx->table->name);
1615 kfree(ctx->table->udata);
1616 kfree(ctx->table);
1617 }
1618
nft_register_chain_type(const struct nft_chain_type * ctype)1619 void nft_register_chain_type(const struct nft_chain_type *ctype)
1620 {
1621 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1622 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1623 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1624 return;
1625 }
1626 chain_type[ctype->family][ctype->type] = ctype;
1627 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1628 }
1629 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1630
nft_unregister_chain_type(const struct nft_chain_type * ctype)1631 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1632 {
1633 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1634 chain_type[ctype->family][ctype->type] = NULL;
1635 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1636 }
1637 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1638
1639 /*
1640 * Chains
1641 */
1642
1643 static struct nft_chain *
nft_chain_lookup_byhandle(const struct nft_table * table,u64 handle,u8 genmask)1644 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1645 {
1646 struct nft_chain *chain;
1647
1648 list_for_each_entry(chain, &table->chains, list) {
1649 if (chain->handle == handle &&
1650 nft_active_genmask(chain, genmask))
1651 return chain;
1652 }
1653
1654 return ERR_PTR(-ENOENT);
1655 }
1656
lockdep_commit_lock_is_held(const struct net * net)1657 static bool lockdep_commit_lock_is_held(const struct net *net)
1658 {
1659 #ifdef CONFIG_PROVE_LOCKING
1660 struct nftables_pernet *nft_net = nft_pernet(net);
1661
1662 return lockdep_is_held(&nft_net->commit_mutex);
1663 #else
1664 return true;
1665 #endif
1666 }
1667
nft_chain_lookup(struct net * net,struct nft_table * table,const struct nlattr * nla,u8 genmask)1668 static struct nft_chain *nft_chain_lookup(struct net *net,
1669 struct nft_table *table,
1670 const struct nlattr *nla, u8 genmask)
1671 {
1672 char search[NFT_CHAIN_MAXNAMELEN + 1];
1673 struct rhlist_head *tmp, *list;
1674 struct nft_chain *chain;
1675
1676 if (nla == NULL)
1677 return ERR_PTR(-EINVAL);
1678
1679 nla_strscpy(search, nla, sizeof(search));
1680
1681 WARN_ON(!rcu_read_lock_held() &&
1682 !lockdep_commit_lock_is_held(net));
1683
1684 chain = ERR_PTR(-ENOENT);
1685 rcu_read_lock();
1686 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1687 if (!list)
1688 goto out_unlock;
1689
1690 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1691 if (nft_active_genmask(chain, genmask))
1692 goto out_unlock;
1693 }
1694 chain = ERR_PTR(-ENOENT);
1695 out_unlock:
1696 rcu_read_unlock();
1697 return chain;
1698 }
1699
1700 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1701 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1702 .len = NFT_TABLE_MAXNAMELEN - 1 },
1703 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1704 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1705 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1706 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1707 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1708 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1709 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1710 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1711 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1712 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1713 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1714 .len = NFT_USERDATA_MAXLEN },
1715 };
1716
1717 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1718 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1719 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1720 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1721 .len = IFNAMSIZ - 1 },
1722 };
1723
nft_dump_stats(struct sk_buff * skb,struct nft_stats __percpu * stats)1724 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1725 {
1726 struct nft_stats *cpu_stats, total;
1727 struct nlattr *nest;
1728 unsigned int seq;
1729 u64 pkts, bytes;
1730 int cpu;
1731
1732 if (!stats)
1733 return 0;
1734
1735 memset(&total, 0, sizeof(total));
1736 for_each_possible_cpu(cpu) {
1737 cpu_stats = per_cpu_ptr(stats, cpu);
1738 do {
1739 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1740 pkts = cpu_stats->pkts;
1741 bytes = cpu_stats->bytes;
1742 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1743 total.pkts += pkts;
1744 total.bytes += bytes;
1745 }
1746 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1747 if (nest == NULL)
1748 goto nla_put_failure;
1749
1750 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1751 NFTA_COUNTER_PAD) ||
1752 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1753 NFTA_COUNTER_PAD))
1754 goto nla_put_failure;
1755
1756 nla_nest_end(skb, nest);
1757 return 0;
1758
1759 nla_put_failure:
1760 return -ENOSPC;
1761 }
1762
nft_dump_basechain_hook(struct sk_buff * skb,int family,const struct nft_base_chain * basechain,const struct list_head * hook_list)1763 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1764 const struct nft_base_chain *basechain,
1765 const struct list_head *hook_list)
1766 {
1767 const struct nf_hook_ops *ops = &basechain->ops;
1768 struct nft_hook *hook, *first = NULL;
1769 struct nlattr *nest, *nest_devs;
1770 int n = 0;
1771
1772 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1773 if (nest == NULL)
1774 goto nla_put_failure;
1775 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1776 goto nla_put_failure;
1777 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1778 goto nla_put_failure;
1779
1780 if (nft_base_chain_netdev(family, ops->hooknum)) {
1781 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1782 if (!nest_devs)
1783 goto nla_put_failure;
1784
1785 if (!hook_list)
1786 hook_list = &basechain->hook_list;
1787
1788 list_for_each_entry_rcu(hook, hook_list, list) {
1789 if (!first)
1790 first = hook;
1791
1792 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1793 hook->ops.dev->name))
1794 goto nla_put_failure;
1795 n++;
1796 }
1797 nla_nest_end(skb, nest_devs);
1798
1799 if (n == 1 &&
1800 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1801 goto nla_put_failure;
1802 }
1803 nla_nest_end(skb, nest);
1804
1805 return 0;
1806 nla_put_failure:
1807 return -1;
1808 }
1809
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)1810 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1811 u32 portid, u32 seq, int event, u32 flags,
1812 int family, const struct nft_table *table,
1813 const struct nft_chain *chain,
1814 const struct list_head *hook_list)
1815 {
1816 struct nlmsghdr *nlh;
1817
1818 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1819 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1820 NFNETLINK_V0, nft_base_seq(net));
1821 if (!nlh)
1822 goto nla_put_failure;
1823
1824 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1825 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1826 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1827 NFTA_CHAIN_PAD))
1828 goto nla_put_failure;
1829
1830 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1831 nlmsg_end(skb, nlh);
1832 return 0;
1833 }
1834
1835 if (nft_is_base_chain(chain)) {
1836 const struct nft_base_chain *basechain = nft_base_chain(chain);
1837 struct nft_stats __percpu *stats;
1838
1839 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1840 goto nla_put_failure;
1841
1842 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1843 htonl(basechain->policy)))
1844 goto nla_put_failure;
1845
1846 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1847 goto nla_put_failure;
1848
1849 stats = rcu_dereference_check(basechain->stats,
1850 lockdep_commit_lock_is_held(net));
1851 if (nft_dump_stats(skb, stats))
1852 goto nla_put_failure;
1853 }
1854
1855 if (chain->flags &&
1856 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1857 goto nla_put_failure;
1858
1859 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1860 goto nla_put_failure;
1861
1862 if (chain->udata &&
1863 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1864 goto nla_put_failure;
1865
1866 nlmsg_end(skb, nlh);
1867 return 0;
1868
1869 nla_put_failure:
1870 nlmsg_trim(skb, nlh);
1871 return -1;
1872 }
1873
nf_tables_chain_notify(const struct nft_ctx * ctx,int event,const struct list_head * hook_list)1874 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1875 const struct list_head *hook_list)
1876 {
1877 struct nftables_pernet *nft_net;
1878 struct sk_buff *skb;
1879 u16 flags = 0;
1880 int err;
1881
1882 if (!ctx->report &&
1883 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1884 return;
1885
1886 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1887 if (skb == NULL)
1888 goto err;
1889
1890 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1891 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1892
1893 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1894 event, flags, ctx->family, ctx->table,
1895 ctx->chain, hook_list);
1896 if (err < 0) {
1897 kfree_skb(skb);
1898 goto err;
1899 }
1900
1901 nft_net = nft_pernet(ctx->net);
1902 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1903 return;
1904 err:
1905 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1906 }
1907
nf_tables_dump_chains(struct sk_buff * skb,struct netlink_callback * cb)1908 static int nf_tables_dump_chains(struct sk_buff *skb,
1909 struct netlink_callback *cb)
1910 {
1911 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1912 unsigned int idx = 0, s_idx = cb->args[0];
1913 struct net *net = sock_net(skb->sk);
1914 int family = nfmsg->nfgen_family;
1915 struct nftables_pernet *nft_net;
1916 const struct nft_table *table;
1917 const struct nft_chain *chain;
1918
1919 rcu_read_lock();
1920 nft_net = nft_pernet(net);
1921 cb->seq = READ_ONCE(nft_net->base_seq);
1922
1923 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1924 if (family != NFPROTO_UNSPEC && family != table->family)
1925 continue;
1926
1927 list_for_each_entry_rcu(chain, &table->chains, list) {
1928 if (idx < s_idx)
1929 goto cont;
1930 if (idx > s_idx)
1931 memset(&cb->args[1], 0,
1932 sizeof(cb->args) - sizeof(cb->args[0]));
1933 if (!nft_is_active(net, chain))
1934 continue;
1935 if (nf_tables_fill_chain_info(skb, net,
1936 NETLINK_CB(cb->skb).portid,
1937 cb->nlh->nlmsg_seq,
1938 NFT_MSG_NEWCHAIN,
1939 NLM_F_MULTI,
1940 table->family, table,
1941 chain, NULL) < 0)
1942 goto done;
1943
1944 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1945 cont:
1946 idx++;
1947 }
1948 }
1949 done:
1950 rcu_read_unlock();
1951 cb->args[0] = idx;
1952 return skb->len;
1953 }
1954
1955 /* called with rcu_read_lock held */
nf_tables_getchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])1956 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1957 const struct nlattr * const nla[])
1958 {
1959 struct netlink_ext_ack *extack = info->extack;
1960 u8 genmask = nft_genmask_cur(info->net);
1961 u8 family = info->nfmsg->nfgen_family;
1962 const struct nft_chain *chain;
1963 struct net *net = info->net;
1964 struct nft_table *table;
1965 struct sk_buff *skb2;
1966 int err;
1967
1968 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1969 struct netlink_dump_control c = {
1970 .dump = nf_tables_dump_chains,
1971 .module = THIS_MODULE,
1972 };
1973
1974 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1975 }
1976
1977 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1978 if (IS_ERR(table)) {
1979 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1980 return PTR_ERR(table);
1981 }
1982
1983 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1984 if (IS_ERR(chain)) {
1985 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1986 return PTR_ERR(chain);
1987 }
1988
1989 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1990 if (!skb2)
1991 return -ENOMEM;
1992
1993 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1994 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1995 0, family, table, chain, NULL);
1996 if (err < 0)
1997 goto err_fill_chain_info;
1998
1999 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
2000
2001 err_fill_chain_info:
2002 kfree_skb(skb2);
2003 return err;
2004 }
2005
2006 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
2007 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
2008 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
2009 };
2010
nft_stats_alloc(const struct nlattr * attr)2011 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
2012 {
2013 struct nlattr *tb[NFTA_COUNTER_MAX+1];
2014 struct nft_stats __percpu *newstats;
2015 struct nft_stats *stats;
2016 int err;
2017
2018 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2019 nft_counter_policy, NULL);
2020 if (err < 0)
2021 return ERR_PTR(err);
2022
2023 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2024 return ERR_PTR(-EINVAL);
2025
2026 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2027 if (newstats == NULL)
2028 return ERR_PTR(-ENOMEM);
2029
2030 /* Restore old counters on this cpu, no problem. Per-cpu statistics
2031 * are not exposed to userspace.
2032 */
2033 preempt_disable();
2034 stats = this_cpu_ptr(newstats);
2035 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2036 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2037 preempt_enable();
2038
2039 return newstats;
2040 }
2041
nft_chain_stats_replace(struct nft_trans * trans)2042 static void nft_chain_stats_replace(struct nft_trans *trans)
2043 {
2044 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2045
2046 if (!nft_trans_chain_stats(trans))
2047 return;
2048
2049 nft_trans_chain_stats(trans) =
2050 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2051 lockdep_commit_lock_is_held(trans->ctx.net));
2052
2053 if (!nft_trans_chain_stats(trans))
2054 static_branch_inc(&nft_counters_enabled);
2055 }
2056
nf_tables_chain_free_chain_rules(struct nft_chain * chain)2057 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2058 {
2059 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2060 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2061
2062 if (g0 != g1)
2063 kvfree(g1);
2064 kvfree(g0);
2065
2066 /* should be NULL either via abort or via successful commit */
2067 WARN_ON_ONCE(chain->blob_next);
2068 kvfree(chain->blob_next);
2069 }
2070
nf_tables_chain_destroy(struct nft_chain * chain)2071 void nf_tables_chain_destroy(struct nft_chain *chain)
2072 {
2073 const struct nft_table *table = chain->table;
2074 struct nft_hook *hook, *next;
2075
2076 if (WARN_ON(chain->use > 0))
2077 return;
2078
2079 /* no concurrent access possible anymore */
2080 nf_tables_chain_free_chain_rules(chain);
2081
2082 if (nft_is_base_chain(chain)) {
2083 struct nft_base_chain *basechain = nft_base_chain(chain);
2084
2085 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2086 list_for_each_entry_safe(hook, next,
2087 &basechain->hook_list, list) {
2088 list_del_rcu(&hook->list);
2089 kfree_rcu(hook, rcu);
2090 }
2091 }
2092 module_put(basechain->type->owner);
2093 if (rcu_access_pointer(basechain->stats)) {
2094 static_branch_dec(&nft_counters_enabled);
2095 free_percpu(rcu_dereference_raw(basechain->stats));
2096 }
2097 kfree(chain->name);
2098 kfree(chain->udata);
2099 kfree(basechain);
2100 } else {
2101 kfree(chain->name);
2102 kfree(chain->udata);
2103 kfree(chain);
2104 }
2105 }
2106
nft_netdev_hook_alloc(struct net * net,const struct nlattr * attr)2107 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2108 const struct nlattr *attr)
2109 {
2110 struct net_device *dev;
2111 char ifname[IFNAMSIZ];
2112 struct nft_hook *hook;
2113 int err;
2114
2115 hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2116 if (!hook) {
2117 err = -ENOMEM;
2118 goto err_hook_alloc;
2119 }
2120
2121 nla_strscpy(ifname, attr, IFNAMSIZ);
2122 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2123 * indirectly serializing all the other holders of the commit_mutex with
2124 * the rtnl_mutex.
2125 */
2126 dev = __dev_get_by_name(net, ifname);
2127 if (!dev) {
2128 err = -ENOENT;
2129 goto err_hook_dev;
2130 }
2131 hook->ops.dev = dev;
2132
2133 return hook;
2134
2135 err_hook_dev:
2136 kfree(hook);
2137 err_hook_alloc:
2138 return ERR_PTR(err);
2139 }
2140
nft_hook_list_find(struct list_head * hook_list,const struct nft_hook * this)2141 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2142 const struct nft_hook *this)
2143 {
2144 struct nft_hook *hook;
2145
2146 list_for_each_entry(hook, hook_list, list) {
2147 if (this->ops.dev == hook->ops.dev)
2148 return hook;
2149 }
2150
2151 return NULL;
2152 }
2153
nf_tables_parse_netdev_hooks(struct net * net,const struct nlattr * attr,struct list_head * hook_list,struct netlink_ext_ack * extack)2154 static int nf_tables_parse_netdev_hooks(struct net *net,
2155 const struct nlattr *attr,
2156 struct list_head *hook_list,
2157 struct netlink_ext_ack *extack)
2158 {
2159 struct nft_hook *hook, *next;
2160 const struct nlattr *tmp;
2161 int rem, n = 0, err;
2162
2163 nla_for_each_nested(tmp, attr, rem) {
2164 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2165 err = -EINVAL;
2166 goto err_hook;
2167 }
2168
2169 hook = nft_netdev_hook_alloc(net, tmp);
2170 if (IS_ERR(hook)) {
2171 NL_SET_BAD_ATTR(extack, tmp);
2172 err = PTR_ERR(hook);
2173 goto err_hook;
2174 }
2175 if (nft_hook_list_find(hook_list, hook)) {
2176 NL_SET_BAD_ATTR(extack, tmp);
2177 kfree(hook);
2178 err = -EEXIST;
2179 goto err_hook;
2180 }
2181 list_add_tail(&hook->list, hook_list);
2182 n++;
2183
2184 if (n == NFT_NETDEVICE_MAX) {
2185 err = -EFBIG;
2186 goto err_hook;
2187 }
2188 }
2189
2190 return 0;
2191
2192 err_hook:
2193 list_for_each_entry_safe(hook, next, hook_list, list) {
2194 list_del(&hook->list);
2195 kfree(hook);
2196 }
2197 return err;
2198 }
2199
2200 struct nft_chain_hook {
2201 u32 num;
2202 s32 priority;
2203 const struct nft_chain_type *type;
2204 struct list_head list;
2205 };
2206
nft_chain_parse_netdev(struct net * net,struct nlattr * tb[],struct list_head * hook_list,struct netlink_ext_ack * extack,u32 flags)2207 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2208 struct list_head *hook_list,
2209 struct netlink_ext_ack *extack, u32 flags)
2210 {
2211 struct nft_hook *hook;
2212 int err;
2213
2214 if (tb[NFTA_HOOK_DEV]) {
2215 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2216 if (IS_ERR(hook)) {
2217 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2218 return PTR_ERR(hook);
2219 }
2220
2221 list_add_tail(&hook->list, hook_list);
2222 } else if (tb[NFTA_HOOK_DEVS]) {
2223 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2224 hook_list, extack);
2225 if (err < 0)
2226 return err;
2227
2228 }
2229
2230 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2231 list_empty(hook_list))
2232 return -EINVAL;
2233
2234 return 0;
2235 }
2236
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)2237 static int nft_chain_parse_hook(struct net *net,
2238 struct nft_base_chain *basechain,
2239 const struct nlattr * const nla[],
2240 struct nft_chain_hook *hook, u8 family,
2241 u32 flags, struct netlink_ext_ack *extack)
2242 {
2243 struct nftables_pernet *nft_net = nft_pernet(net);
2244 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2245 const struct nft_chain_type *type;
2246 int err;
2247
2248 lockdep_assert_held(&nft_net->commit_mutex);
2249 lockdep_nfnl_nft_mutex_not_held();
2250
2251 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2252 nla[NFTA_CHAIN_HOOK],
2253 nft_hook_policy, NULL);
2254 if (err < 0)
2255 return err;
2256
2257 if (!basechain) {
2258 if (!ha[NFTA_HOOK_HOOKNUM] ||
2259 !ha[NFTA_HOOK_PRIORITY]) {
2260 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2261 return -ENOENT;
2262 }
2263
2264 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2265 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2266
2267 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2268 if (!type)
2269 return -EOPNOTSUPP;
2270
2271 if (nla[NFTA_CHAIN_TYPE]) {
2272 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2273 family, true);
2274 if (IS_ERR(type)) {
2275 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2276 return PTR_ERR(type);
2277 }
2278 }
2279 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2280 return -EOPNOTSUPP;
2281
2282 if (type->type == NFT_CHAIN_T_NAT &&
2283 hook->priority <= NF_IP_PRI_CONNTRACK)
2284 return -EOPNOTSUPP;
2285 } else {
2286 if (ha[NFTA_HOOK_HOOKNUM]) {
2287 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2288 if (hook->num != basechain->ops.hooknum)
2289 return -EOPNOTSUPP;
2290 }
2291 if (ha[NFTA_HOOK_PRIORITY]) {
2292 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2293 if (hook->priority != basechain->ops.priority)
2294 return -EOPNOTSUPP;
2295 }
2296
2297 if (nla[NFTA_CHAIN_TYPE]) {
2298 type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2299 family);
2300 if (!type) {
2301 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2302 return -ENOENT;
2303 }
2304 } else {
2305 type = basechain->type;
2306 }
2307 }
2308
2309 if (!try_module_get(type->owner)) {
2310 if (nla[NFTA_CHAIN_TYPE])
2311 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2312 return -ENOENT;
2313 }
2314
2315 hook->type = type;
2316
2317 INIT_LIST_HEAD(&hook->list);
2318 if (nft_base_chain_netdev(family, hook->num)) {
2319 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2320 if (err < 0) {
2321 module_put(type->owner);
2322 return err;
2323 }
2324 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2325 module_put(type->owner);
2326 return -EOPNOTSUPP;
2327 }
2328
2329 return 0;
2330 }
2331
nft_chain_release_hook(struct nft_chain_hook * hook)2332 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2333 {
2334 struct nft_hook *h, *next;
2335
2336 list_for_each_entry_safe(h, next, &hook->list, list) {
2337 list_del(&h->list);
2338 kfree(h);
2339 }
2340 module_put(hook->type->owner);
2341 }
2342
nft_last_rule(const struct nft_chain * chain,const void * ptr)2343 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2344 {
2345 struct nft_rule_dp_last *lrule;
2346
2347 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2348
2349 lrule = (struct nft_rule_dp_last *)ptr;
2350 lrule->end.is_last = 1;
2351 lrule->chain = chain;
2352 /* blob size does not include the trailer rule */
2353 }
2354
nf_tables_chain_alloc_rules(const struct nft_chain * chain,unsigned int size)2355 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2356 unsigned int size)
2357 {
2358 struct nft_rule_blob *blob;
2359
2360 if (size > INT_MAX)
2361 return NULL;
2362
2363 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2364
2365 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2366 if (!blob)
2367 return NULL;
2368
2369 blob->size = 0;
2370 nft_last_rule(chain, blob->data);
2371
2372 return blob;
2373 }
2374
nft_basechain_hook_init(struct nf_hook_ops * ops,u8 family,const struct nft_chain_hook * hook,struct nft_chain * chain)2375 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2376 const struct nft_chain_hook *hook,
2377 struct nft_chain *chain)
2378 {
2379 ops->pf = family;
2380 ops->hooknum = hook->num;
2381 ops->priority = hook->priority;
2382 ops->priv = chain;
2383 ops->hook = hook->type->hooks[ops->hooknum];
2384 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2385 }
2386
nft_basechain_init(struct nft_base_chain * basechain,u8 family,struct nft_chain_hook * hook,u32 flags)2387 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2388 struct nft_chain_hook *hook, u32 flags)
2389 {
2390 struct nft_chain *chain;
2391 struct nft_hook *h;
2392
2393 basechain->type = hook->type;
2394 INIT_LIST_HEAD(&basechain->hook_list);
2395 chain = &basechain->chain;
2396
2397 if (nft_base_chain_netdev(family, hook->num)) {
2398 list_splice_init(&hook->list, &basechain->hook_list);
2399 list_for_each_entry(h, &basechain->hook_list, list)
2400 nft_basechain_hook_init(&h->ops, family, hook, chain);
2401 }
2402 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2403
2404 chain->flags |= NFT_CHAIN_BASE | flags;
2405 basechain->policy = NF_ACCEPT;
2406 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2407 !nft_chain_offload_support(basechain)) {
2408 list_splice_init(&basechain->hook_list, &hook->list);
2409 return -EOPNOTSUPP;
2410 }
2411
2412 flow_block_init(&basechain->flow_block);
2413
2414 return 0;
2415 }
2416
nft_chain_add(struct nft_table * table,struct nft_chain * chain)2417 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2418 {
2419 int err;
2420
2421 err = rhltable_insert_key(&table->chains_ht, chain->name,
2422 &chain->rhlhead, nft_chain_ht_params);
2423 if (err)
2424 return err;
2425
2426 list_add_tail_rcu(&chain->list, &table->chains);
2427
2428 return 0;
2429 }
2430
2431 static u64 chain_id;
2432
nf_tables_addchain(struct nft_ctx * ctx,u8 family,u8 genmask,u8 policy,u32 flags,struct netlink_ext_ack * extack)2433 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2434 u8 policy, u32 flags,
2435 struct netlink_ext_ack *extack)
2436 {
2437 const struct nlattr * const *nla = ctx->nla;
2438 struct nft_table *table = ctx->table;
2439 struct nft_base_chain *basechain;
2440 struct net *net = ctx->net;
2441 char name[NFT_NAME_MAXLEN];
2442 struct nft_rule_blob *blob;
2443 struct nft_trans *trans;
2444 struct nft_chain *chain;
2445 int err;
2446
2447 if (nla[NFTA_CHAIN_HOOK]) {
2448 struct nft_stats __percpu *stats = NULL;
2449 struct nft_chain_hook hook = {};
2450
2451 if (table->flags & __NFT_TABLE_F_UPDATE)
2452 return -EINVAL;
2453
2454 if (flags & NFT_CHAIN_BINDING)
2455 return -EOPNOTSUPP;
2456
2457 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2458 extack);
2459 if (err < 0)
2460 return err;
2461
2462 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2463 if (basechain == NULL) {
2464 nft_chain_release_hook(&hook);
2465 return -ENOMEM;
2466 }
2467 chain = &basechain->chain;
2468
2469 if (nla[NFTA_CHAIN_COUNTERS]) {
2470 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2471 if (IS_ERR(stats)) {
2472 nft_chain_release_hook(&hook);
2473 kfree(basechain);
2474 return PTR_ERR(stats);
2475 }
2476 rcu_assign_pointer(basechain->stats, stats);
2477 }
2478
2479 err = nft_basechain_init(basechain, family, &hook, flags);
2480 if (err < 0) {
2481 nft_chain_release_hook(&hook);
2482 kfree(basechain);
2483 free_percpu(stats);
2484 return err;
2485 }
2486 if (stats)
2487 static_branch_inc(&nft_counters_enabled);
2488 } else {
2489 if (flags & NFT_CHAIN_BASE)
2490 return -EINVAL;
2491 if (flags & NFT_CHAIN_HW_OFFLOAD)
2492 return -EOPNOTSUPP;
2493
2494 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2495 if (chain == NULL)
2496 return -ENOMEM;
2497
2498 chain->flags = flags;
2499 }
2500 ctx->chain = chain;
2501
2502 INIT_LIST_HEAD(&chain->rules);
2503 chain->handle = nf_tables_alloc_handle(table);
2504 chain->table = table;
2505
2506 if (nla[NFTA_CHAIN_NAME]) {
2507 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2508 } else {
2509 if (!(flags & NFT_CHAIN_BINDING)) {
2510 err = -EINVAL;
2511 goto err_destroy_chain;
2512 }
2513
2514 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2515 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2516 }
2517
2518 if (!chain->name) {
2519 err = -ENOMEM;
2520 goto err_destroy_chain;
2521 }
2522
2523 if (nla[NFTA_CHAIN_USERDATA]) {
2524 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2525 if (chain->udata == NULL) {
2526 err = -ENOMEM;
2527 goto err_destroy_chain;
2528 }
2529 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2530 }
2531
2532 blob = nf_tables_chain_alloc_rules(chain, 0);
2533 if (!blob) {
2534 err = -ENOMEM;
2535 goto err_destroy_chain;
2536 }
2537
2538 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2539 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2540
2541 if (!nft_use_inc(&table->use)) {
2542 err = -EMFILE;
2543 goto err_destroy_chain;
2544 }
2545
2546 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2547 if (IS_ERR(trans)) {
2548 err = PTR_ERR(trans);
2549 goto err_trans;
2550 }
2551
2552 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2553 if (nft_is_base_chain(chain))
2554 nft_trans_chain_policy(trans) = policy;
2555
2556 err = nft_chain_add(table, chain);
2557 if (err < 0)
2558 goto err_chain_add;
2559
2560 /* This must be LAST to ensure no packets are walking over this chain. */
2561 err = nf_tables_register_hook(net, table, chain);
2562 if (err < 0)
2563 goto err_register_hook;
2564
2565 return 0;
2566
2567 err_register_hook:
2568 nft_chain_del(chain);
2569 err_chain_add:
2570 nft_trans_destroy(trans);
2571 err_trans:
2572 nft_use_dec_restore(&table->use);
2573 err_destroy_chain:
2574 nf_tables_chain_destroy(chain);
2575
2576 return err;
2577 }
2578
nf_tables_updchain(struct nft_ctx * ctx,u8 genmask,u8 policy,u32 flags,const struct nlattr * attr,struct netlink_ext_ack * extack)2579 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2580 u32 flags, const struct nlattr *attr,
2581 struct netlink_ext_ack *extack)
2582 {
2583 const struct nlattr * const *nla = ctx->nla;
2584 struct nft_base_chain *basechain = NULL;
2585 struct nft_table *table = ctx->table;
2586 struct nft_chain *chain = ctx->chain;
2587 struct nft_chain_hook hook = {};
2588 struct nft_stats *stats = NULL;
2589 struct nft_hook *h, *next;
2590 struct nf_hook_ops *ops;
2591 struct nft_trans *trans;
2592 bool unregister = false;
2593 int err;
2594
2595 if (chain->flags ^ flags)
2596 return -EOPNOTSUPP;
2597
2598 INIT_LIST_HEAD(&hook.list);
2599
2600 if (nla[NFTA_CHAIN_HOOK]) {
2601 if (!nft_is_base_chain(chain)) {
2602 NL_SET_BAD_ATTR(extack, attr);
2603 return -EEXIST;
2604 }
2605
2606 basechain = nft_base_chain(chain);
2607 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2608 ctx->family, flags, extack);
2609 if (err < 0)
2610 return err;
2611
2612 if (basechain->type != hook.type) {
2613 nft_chain_release_hook(&hook);
2614 NL_SET_BAD_ATTR(extack, attr);
2615 return -EEXIST;
2616 }
2617
2618 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2619 list_for_each_entry_safe(h, next, &hook.list, list) {
2620 h->ops.pf = basechain->ops.pf;
2621 h->ops.hooknum = basechain->ops.hooknum;
2622 h->ops.priority = basechain->ops.priority;
2623 h->ops.priv = basechain->ops.priv;
2624 h->ops.hook = basechain->ops.hook;
2625
2626 if (nft_hook_list_find(&basechain->hook_list, h)) {
2627 list_del(&h->list);
2628 kfree(h);
2629 }
2630 }
2631 } else {
2632 ops = &basechain->ops;
2633 if (ops->hooknum != hook.num ||
2634 ops->priority != hook.priority) {
2635 nft_chain_release_hook(&hook);
2636 NL_SET_BAD_ATTR(extack, attr);
2637 return -EEXIST;
2638 }
2639 }
2640 }
2641
2642 if (nla[NFTA_CHAIN_HANDLE] &&
2643 nla[NFTA_CHAIN_NAME]) {
2644 struct nft_chain *chain2;
2645
2646 chain2 = nft_chain_lookup(ctx->net, table,
2647 nla[NFTA_CHAIN_NAME], genmask);
2648 if (!IS_ERR(chain2)) {
2649 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2650 err = -EEXIST;
2651 goto err_hooks;
2652 }
2653 }
2654
2655 if (table->flags & __NFT_TABLE_F_UPDATE &&
2656 !list_empty(&hook.list)) {
2657 NL_SET_BAD_ATTR(extack, attr);
2658 err = -EOPNOTSUPP;
2659 goto err_hooks;
2660 }
2661
2662 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2663 nft_is_base_chain(chain) &&
2664 !list_empty(&hook.list)) {
2665 basechain = nft_base_chain(chain);
2666 ops = &basechain->ops;
2667
2668 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2669 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2670 if (err < 0)
2671 goto err_hooks;
2672 }
2673 }
2674
2675 unregister = true;
2676
2677 if (nla[NFTA_CHAIN_COUNTERS]) {
2678 if (!nft_is_base_chain(chain)) {
2679 err = -EOPNOTSUPP;
2680 goto err_hooks;
2681 }
2682
2683 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2684 if (IS_ERR(stats)) {
2685 err = PTR_ERR(stats);
2686 goto err_hooks;
2687 }
2688 }
2689
2690 err = -ENOMEM;
2691 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2692 sizeof(struct nft_trans_chain));
2693 if (trans == NULL)
2694 goto err_trans;
2695
2696 nft_trans_chain_stats(trans) = stats;
2697 nft_trans_chain_update(trans) = true;
2698
2699 if (nla[NFTA_CHAIN_POLICY])
2700 nft_trans_chain_policy(trans) = policy;
2701 else
2702 nft_trans_chain_policy(trans) = -1;
2703
2704 if (nla[NFTA_CHAIN_HANDLE] &&
2705 nla[NFTA_CHAIN_NAME]) {
2706 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2707 struct nft_trans *tmp;
2708 char *name;
2709
2710 err = -ENOMEM;
2711 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2712 if (!name)
2713 goto err_trans;
2714
2715 err = -EEXIST;
2716 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2717 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2718 tmp->ctx.table == table &&
2719 nft_trans_chain_update(tmp) &&
2720 nft_trans_chain_name(tmp) &&
2721 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2722 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2723 kfree(name);
2724 goto err_trans;
2725 }
2726 }
2727
2728 nft_trans_chain_name(trans) = name;
2729 }
2730
2731 nft_trans_basechain(trans) = basechain;
2732 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2733 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2734 if (nla[NFTA_CHAIN_HOOK])
2735 module_put(hook.type->owner);
2736
2737 nft_trans_commit_list_add_tail(ctx->net, trans);
2738
2739 return 0;
2740
2741 err_trans:
2742 free_percpu(stats);
2743 kfree(trans);
2744 err_hooks:
2745 if (nla[NFTA_CHAIN_HOOK]) {
2746 list_for_each_entry_safe(h, next, &hook.list, list) {
2747 if (unregister)
2748 nf_unregister_net_hook(ctx->net, &h->ops);
2749 list_del(&h->list);
2750 kfree_rcu(h, rcu);
2751 }
2752 module_put(hook.type->owner);
2753 }
2754
2755 return err;
2756 }
2757
nft_chain_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)2758 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2759 const struct nft_table *table,
2760 const struct nlattr *nla, u8 genmask)
2761 {
2762 struct nftables_pernet *nft_net = nft_pernet(net);
2763 u32 id = ntohl(nla_get_be32(nla));
2764 struct nft_trans *trans;
2765
2766 list_for_each_entry(trans, &nft_net->commit_list, list) {
2767 struct nft_chain *chain = trans->ctx.chain;
2768
2769 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2770 chain->table == table &&
2771 id == nft_trans_chain_id(trans) &&
2772 nft_active_genmask(chain, genmask))
2773 return chain;
2774 }
2775 return ERR_PTR(-ENOENT);
2776 }
2777
nf_tables_newchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2778 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2779 const struct nlattr * const nla[])
2780 {
2781 struct nftables_pernet *nft_net = nft_pernet(info->net);
2782 struct netlink_ext_ack *extack = info->extack;
2783 u8 genmask = nft_genmask_next(info->net);
2784 u8 family = info->nfmsg->nfgen_family;
2785 struct nft_chain *chain = NULL;
2786 struct net *net = info->net;
2787 const struct nlattr *attr;
2788 struct nft_table *table;
2789 u8 policy = NF_ACCEPT;
2790 struct nft_ctx ctx;
2791 u64 handle = 0;
2792 u32 flags = 0;
2793
2794 lockdep_assert_held(&nft_net->commit_mutex);
2795
2796 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2797 NETLINK_CB(skb).portid);
2798 if (IS_ERR(table)) {
2799 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2800 return PTR_ERR(table);
2801 }
2802
2803 chain = NULL;
2804 attr = nla[NFTA_CHAIN_NAME];
2805
2806 if (nla[NFTA_CHAIN_HANDLE]) {
2807 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2808 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2809 if (IS_ERR(chain)) {
2810 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2811 return PTR_ERR(chain);
2812 }
2813 attr = nla[NFTA_CHAIN_HANDLE];
2814 } else if (nla[NFTA_CHAIN_NAME]) {
2815 chain = nft_chain_lookup(net, table, attr, genmask);
2816 if (IS_ERR(chain)) {
2817 if (PTR_ERR(chain) != -ENOENT) {
2818 NL_SET_BAD_ATTR(extack, attr);
2819 return PTR_ERR(chain);
2820 }
2821 chain = NULL;
2822 }
2823 } else if (!nla[NFTA_CHAIN_ID]) {
2824 return -EINVAL;
2825 }
2826
2827 if (nla[NFTA_CHAIN_POLICY]) {
2828 if (chain != NULL &&
2829 !nft_is_base_chain(chain)) {
2830 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2831 return -EOPNOTSUPP;
2832 }
2833
2834 if (chain == NULL &&
2835 nla[NFTA_CHAIN_HOOK] == NULL) {
2836 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2837 return -EOPNOTSUPP;
2838 }
2839
2840 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2841 switch (policy) {
2842 case NF_DROP:
2843 case NF_ACCEPT:
2844 break;
2845 default:
2846 return -EINVAL;
2847 }
2848 }
2849
2850 if (nla[NFTA_CHAIN_FLAGS])
2851 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2852 else if (chain)
2853 flags = chain->flags;
2854
2855 if (flags & ~NFT_CHAIN_FLAGS)
2856 return -EOPNOTSUPP;
2857
2858 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2859
2860 if (chain != NULL) {
2861 if (chain->flags & NFT_CHAIN_BINDING)
2862 return -EINVAL;
2863
2864 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2865 NL_SET_BAD_ATTR(extack, attr);
2866 return -EEXIST;
2867 }
2868 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2869 return -EOPNOTSUPP;
2870
2871 flags |= chain->flags & NFT_CHAIN_BASE;
2872 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2873 extack);
2874 }
2875
2876 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2877 }
2878
nft_delchain_hook(struct nft_ctx * ctx,struct nft_base_chain * basechain,struct netlink_ext_ack * extack)2879 static int nft_delchain_hook(struct nft_ctx *ctx,
2880 struct nft_base_chain *basechain,
2881 struct netlink_ext_ack *extack)
2882 {
2883 const struct nft_chain *chain = &basechain->chain;
2884 const struct nlattr * const *nla = ctx->nla;
2885 struct nft_chain_hook chain_hook = {};
2886 struct nft_hook *this, *hook;
2887 LIST_HEAD(chain_del_list);
2888 struct nft_trans *trans;
2889 int err;
2890
2891 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
2892 return -EOPNOTSUPP;
2893
2894 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2895 ctx->family, chain->flags, extack);
2896 if (err < 0)
2897 return err;
2898
2899 list_for_each_entry(this, &chain_hook.list, list) {
2900 hook = nft_hook_list_find(&basechain->hook_list, this);
2901 if (!hook) {
2902 err = -ENOENT;
2903 goto err_chain_del_hook;
2904 }
2905 list_move(&hook->list, &chain_del_list);
2906 }
2907
2908 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2909 sizeof(struct nft_trans_chain));
2910 if (!trans) {
2911 err = -ENOMEM;
2912 goto err_chain_del_hook;
2913 }
2914
2915 nft_trans_basechain(trans) = basechain;
2916 nft_trans_chain_update(trans) = true;
2917 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2918 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2919 nft_chain_release_hook(&chain_hook);
2920
2921 nft_trans_commit_list_add_tail(ctx->net, trans);
2922
2923 return 0;
2924
2925 err_chain_del_hook:
2926 list_splice(&chain_del_list, &basechain->hook_list);
2927 nft_chain_release_hook(&chain_hook);
2928
2929 return err;
2930 }
2931
nf_tables_delchain(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])2932 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2933 const struct nlattr * const nla[])
2934 {
2935 struct netlink_ext_ack *extack = info->extack;
2936 u8 genmask = nft_genmask_next(info->net);
2937 u8 family = info->nfmsg->nfgen_family;
2938 struct net *net = info->net;
2939 const struct nlattr *attr;
2940 struct nft_table *table;
2941 struct nft_chain *chain;
2942 struct nft_rule *rule;
2943 struct nft_ctx ctx;
2944 u64 handle;
2945 u32 use;
2946 int err;
2947
2948 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2949 NETLINK_CB(skb).portid);
2950 if (IS_ERR(table)) {
2951 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2952 return PTR_ERR(table);
2953 }
2954
2955 if (nla[NFTA_CHAIN_HANDLE]) {
2956 attr = nla[NFTA_CHAIN_HANDLE];
2957 handle = be64_to_cpu(nla_get_be64(attr));
2958 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2959 } else {
2960 attr = nla[NFTA_CHAIN_NAME];
2961 chain = nft_chain_lookup(net, table, attr, genmask);
2962 }
2963 if (IS_ERR(chain)) {
2964 if (PTR_ERR(chain) == -ENOENT &&
2965 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2966 return 0;
2967
2968 NL_SET_BAD_ATTR(extack, attr);
2969 return PTR_ERR(chain);
2970 }
2971
2972 if (nft_chain_binding(chain))
2973 return -EOPNOTSUPP;
2974
2975 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2976
2977 if (nla[NFTA_CHAIN_HOOK]) {
2978 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
2979 chain->flags & NFT_CHAIN_HW_OFFLOAD)
2980 return -EOPNOTSUPP;
2981
2982 if (nft_is_base_chain(chain)) {
2983 struct nft_base_chain *basechain = nft_base_chain(chain);
2984
2985 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2986 return nft_delchain_hook(&ctx, basechain, extack);
2987 }
2988 }
2989
2990 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2991 chain->use > 0)
2992 return -EBUSY;
2993
2994 use = chain->use;
2995 list_for_each_entry(rule, &chain->rules, list) {
2996 if (!nft_is_active_next(net, rule))
2997 continue;
2998 use--;
2999
3000 err = nft_delrule(&ctx, rule);
3001 if (err < 0)
3002 return err;
3003 }
3004
3005 /* There are rules and elements that are still holding references to us,
3006 * we cannot do a recursive removal in this case.
3007 */
3008 if (use > 0) {
3009 NL_SET_BAD_ATTR(extack, attr);
3010 return -EBUSY;
3011 }
3012
3013 return nft_delchain(&ctx);
3014 }
3015
3016 /*
3017 * Expressions
3018 */
3019
3020 /**
3021 * nft_register_expr - register nf_tables expr type
3022 * @type: expr type
3023 *
3024 * Registers the expr type for use with nf_tables. Returns zero on
3025 * success or a negative errno code otherwise.
3026 */
nft_register_expr(struct nft_expr_type * type)3027 int nft_register_expr(struct nft_expr_type *type)
3028 {
3029 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3030 if (type->family == NFPROTO_UNSPEC)
3031 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3032 else
3033 list_add_rcu(&type->list, &nf_tables_expressions);
3034 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3035 return 0;
3036 }
3037 EXPORT_SYMBOL_GPL(nft_register_expr);
3038
3039 /**
3040 * nft_unregister_expr - unregister nf_tables expr type
3041 * @type: expr type
3042 *
3043 * Unregisters the expr typefor use with nf_tables.
3044 */
nft_unregister_expr(struct nft_expr_type * type)3045 void nft_unregister_expr(struct nft_expr_type *type)
3046 {
3047 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3048 list_del_rcu(&type->list);
3049 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3050 }
3051 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3052
__nft_expr_type_get(u8 family,struct nlattr * nla)3053 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3054 struct nlattr *nla)
3055 {
3056 const struct nft_expr_type *type, *candidate = NULL;
3057
3058 list_for_each_entry_rcu(type, &nf_tables_expressions, list) {
3059 if (!nla_strcmp(nla, type->name)) {
3060 if (!type->family && !candidate)
3061 candidate = type;
3062 else if (type->family == family)
3063 candidate = type;
3064 }
3065 }
3066 return candidate;
3067 }
3068
3069 #ifdef CONFIG_MODULES
nft_expr_type_request_module(struct net * net,u8 family,struct nlattr * nla)3070 static int nft_expr_type_request_module(struct net *net, u8 family,
3071 struct nlattr *nla)
3072 {
3073 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3074 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3075 return -EAGAIN;
3076
3077 return 0;
3078 }
3079 #endif
3080
nft_expr_type_get(struct net * net,u8 family,struct nlattr * nla)3081 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3082 u8 family,
3083 struct nlattr *nla)
3084 {
3085 const struct nft_expr_type *type;
3086
3087 if (nla == NULL)
3088 return ERR_PTR(-EINVAL);
3089
3090 rcu_read_lock();
3091 type = __nft_expr_type_get(family, nla);
3092 if (type != NULL && try_module_get(type->owner)) {
3093 rcu_read_unlock();
3094 return type;
3095 }
3096 rcu_read_unlock();
3097
3098 lockdep_nfnl_nft_mutex_not_held();
3099 #ifdef CONFIG_MODULES
3100 if (type == NULL) {
3101 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3102 return ERR_PTR(-EAGAIN);
3103
3104 if (nft_request_module(net, "nft-expr-%.*s",
3105 nla_len(nla),
3106 (char *)nla_data(nla)) == -EAGAIN)
3107 return ERR_PTR(-EAGAIN);
3108 }
3109 #endif
3110 return ERR_PTR(-ENOENT);
3111 }
3112
3113 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3114 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3115 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3116 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3117 };
3118
nf_tables_fill_expr_info(struct sk_buff * skb,const struct nft_expr * expr,bool reset)3119 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3120 const struct nft_expr *expr, bool reset)
3121 {
3122 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3123 goto nla_put_failure;
3124
3125 if (expr->ops->dump) {
3126 struct nlattr *data = nla_nest_start_noflag(skb,
3127 NFTA_EXPR_DATA);
3128 if (data == NULL)
3129 goto nla_put_failure;
3130 if (expr->ops->dump(skb, expr, reset) < 0)
3131 goto nla_put_failure;
3132 nla_nest_end(skb, data);
3133 }
3134
3135 return skb->len;
3136
3137 nla_put_failure:
3138 return -1;
3139 };
3140
nft_expr_dump(struct sk_buff * skb,unsigned int attr,const struct nft_expr * expr,bool reset)3141 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3142 const struct nft_expr *expr, bool reset)
3143 {
3144 struct nlattr *nest;
3145
3146 nest = nla_nest_start_noflag(skb, attr);
3147 if (!nest)
3148 goto nla_put_failure;
3149 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3150 goto nla_put_failure;
3151 nla_nest_end(skb, nest);
3152 return 0;
3153
3154 nla_put_failure:
3155 return -1;
3156 }
3157
3158 struct nft_expr_info {
3159 const struct nft_expr_ops *ops;
3160 const struct nlattr *attr;
3161 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3162 };
3163
nf_tables_expr_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)3164 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3165 const struct nlattr *nla,
3166 struct nft_expr_info *info)
3167 {
3168 const struct nft_expr_type *type;
3169 const struct nft_expr_ops *ops;
3170 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3171 int err;
3172
3173 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3174 nft_expr_policy, NULL);
3175 if (err < 0)
3176 return err;
3177
3178 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3179 if (IS_ERR(type))
3180 return PTR_ERR(type);
3181
3182 if (tb[NFTA_EXPR_DATA]) {
3183 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3184 tb[NFTA_EXPR_DATA],
3185 type->policy, NULL);
3186 if (err < 0)
3187 goto err1;
3188 } else
3189 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3190
3191 if (type->select_ops != NULL) {
3192 ops = type->select_ops(ctx,
3193 (const struct nlattr * const *)info->tb);
3194 if (IS_ERR(ops)) {
3195 err = PTR_ERR(ops);
3196 #ifdef CONFIG_MODULES
3197 if (err == -EAGAIN)
3198 if (nft_expr_type_request_module(ctx->net,
3199 ctx->family,
3200 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3201 err = -ENOENT;
3202 #endif
3203 goto err1;
3204 }
3205 } else
3206 ops = type->ops;
3207
3208 info->attr = nla;
3209 info->ops = ops;
3210
3211 return 0;
3212
3213 err1:
3214 module_put(type->owner);
3215 return err;
3216 }
3217
nft_expr_inner_parse(const struct nft_ctx * ctx,const struct nlattr * nla,struct nft_expr_info * info)3218 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3219 struct nft_expr_info *info)
3220 {
3221 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3222 const struct nft_expr_type *type;
3223 int err;
3224
3225 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3226 nft_expr_policy, NULL);
3227 if (err < 0)
3228 return err;
3229
3230 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3231 return -EINVAL;
3232
3233 rcu_read_lock();
3234
3235 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3236 if (!type) {
3237 err = -ENOENT;
3238 goto out_unlock;
3239 }
3240
3241 if (!type->inner_ops) {
3242 err = -EOPNOTSUPP;
3243 goto out_unlock;
3244 }
3245
3246 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3247 tb[NFTA_EXPR_DATA],
3248 type->policy, NULL);
3249 if (err < 0)
3250 goto out_unlock;
3251
3252 info->attr = nla;
3253 info->ops = type->inner_ops;
3254
3255 /* No module reference will be taken on type->owner.
3256 * Presence of type->inner_ops implies that the expression
3257 * is builtin, so it cannot go away.
3258 */
3259 rcu_read_unlock();
3260 return 0;
3261
3262 out_unlock:
3263 rcu_read_unlock();
3264 return err;
3265 }
3266
nf_tables_newexpr(const struct nft_ctx * ctx,const struct nft_expr_info * expr_info,struct nft_expr * expr)3267 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3268 const struct nft_expr_info *expr_info,
3269 struct nft_expr *expr)
3270 {
3271 const struct nft_expr_ops *ops = expr_info->ops;
3272 int err;
3273
3274 expr->ops = ops;
3275 if (ops->init) {
3276 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3277 if (err < 0)
3278 goto err1;
3279 }
3280
3281 return 0;
3282 err1:
3283 expr->ops = NULL;
3284 return err;
3285 }
3286
nf_tables_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)3287 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3288 struct nft_expr *expr)
3289 {
3290 const struct nft_expr_type *type = expr->ops->type;
3291
3292 if (expr->ops->destroy)
3293 expr->ops->destroy(ctx, expr);
3294 module_put(type->owner);
3295 }
3296
nft_expr_init(const struct nft_ctx * ctx,const struct nlattr * nla)3297 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3298 const struct nlattr *nla)
3299 {
3300 struct nft_expr_info expr_info;
3301 struct nft_expr *expr;
3302 struct module *owner;
3303 int err;
3304
3305 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3306 if (err < 0)
3307 goto err_expr_parse;
3308
3309 err = -EOPNOTSUPP;
3310 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3311 goto err_expr_stateful;
3312
3313 err = -ENOMEM;
3314 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3315 if (expr == NULL)
3316 goto err_expr_stateful;
3317
3318 err = nf_tables_newexpr(ctx, &expr_info, expr);
3319 if (err < 0)
3320 goto err_expr_new;
3321
3322 return expr;
3323 err_expr_new:
3324 kfree(expr);
3325 err_expr_stateful:
3326 owner = expr_info.ops->type->owner;
3327 if (expr_info.ops->type->release_ops)
3328 expr_info.ops->type->release_ops(expr_info.ops);
3329
3330 module_put(owner);
3331 err_expr_parse:
3332 return ERR_PTR(err);
3333 }
3334
nft_expr_clone(struct nft_expr * dst,struct nft_expr * src,gfp_t gfp)3335 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp)
3336 {
3337 int err;
3338
3339 if (WARN_ON_ONCE(!src->ops->clone))
3340 return -EINVAL;
3341
3342 dst->ops = src->ops;
3343 err = src->ops->clone(dst, src, gfp);
3344 if (err < 0)
3345 return err;
3346
3347 __module_get(src->ops->type->owner);
3348
3349 return 0;
3350 }
3351
nft_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)3352 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3353 {
3354 nf_tables_expr_destroy(ctx, expr);
3355 kfree(expr);
3356 }
3357
3358 /*
3359 * Rules
3360 */
3361
__nft_rule_lookup(const struct net * net,const struct nft_chain * chain,u64 handle)3362 static struct nft_rule *__nft_rule_lookup(const struct net *net,
3363 const struct nft_chain *chain,
3364 u64 handle)
3365 {
3366 struct nft_rule *rule;
3367
3368 // FIXME: this sucks
3369 list_for_each_entry_rcu(rule, &chain->rules, list,
3370 lockdep_commit_lock_is_held(net)) {
3371 if (handle == rule->handle)
3372 return rule;
3373 }
3374
3375 return ERR_PTR(-ENOENT);
3376 }
3377
nft_rule_lookup(const struct net * net,const struct nft_chain * chain,const struct nlattr * nla)3378 static struct nft_rule *nft_rule_lookup(const struct net *net,
3379 const struct nft_chain *chain,
3380 const struct nlattr *nla)
3381 {
3382 if (nla == NULL)
3383 return ERR_PTR(-EINVAL);
3384
3385 return __nft_rule_lookup(net, chain, be64_to_cpu(nla_get_be64(nla)));
3386 }
3387
3388 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3389 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3390 .len = NFT_TABLE_MAXNAMELEN - 1 },
3391 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3392 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3393 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3394 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3395 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3396 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3397 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3398 .len = NFT_USERDATA_MAXLEN },
3399 [NFTA_RULE_ID] = { .type = NLA_U32 },
3400 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3401 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3402 };
3403
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)3404 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3405 u32 portid, u32 seq, int event,
3406 u32 flags, int family,
3407 const struct nft_table *table,
3408 const struct nft_chain *chain,
3409 const struct nft_rule *rule, u64 handle,
3410 bool reset)
3411 {
3412 struct nlmsghdr *nlh;
3413 const struct nft_expr *expr, *next;
3414 struct nlattr *list;
3415 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3416
3417 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3418 nft_base_seq(net));
3419 if (!nlh)
3420 goto nla_put_failure;
3421
3422 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3423 goto nla_put_failure;
3424 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3425 goto nla_put_failure;
3426 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3427 NFTA_RULE_PAD))
3428 goto nla_put_failure;
3429
3430 if (event != NFT_MSG_DELRULE && handle) {
3431 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3432 NFTA_RULE_PAD))
3433 goto nla_put_failure;
3434 }
3435
3436 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3437 nft_flow_rule_stats(chain, rule);
3438
3439 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3440 if (list == NULL)
3441 goto nla_put_failure;
3442 nft_rule_for_each_expr(expr, next, rule) {
3443 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3444 goto nla_put_failure;
3445 }
3446 nla_nest_end(skb, list);
3447
3448 if (rule->udata) {
3449 struct nft_userdata *udata = nft_userdata(rule);
3450 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3451 udata->data) < 0)
3452 goto nla_put_failure;
3453 }
3454
3455 nlmsg_end(skb, nlh);
3456 return 0;
3457
3458 nla_put_failure:
3459 nlmsg_trim(skb, nlh);
3460 return -1;
3461 }
3462
nf_tables_rule_notify(const struct nft_ctx * ctx,const struct nft_rule * rule,int event)3463 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3464 const struct nft_rule *rule, int event)
3465 {
3466 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3467 const struct nft_rule *prule;
3468 struct sk_buff *skb;
3469 u64 handle = 0;
3470 u16 flags = 0;
3471 int err;
3472
3473 if (!ctx->report &&
3474 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3475 return;
3476
3477 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3478 if (skb == NULL)
3479 goto err;
3480
3481 if (event == NFT_MSG_NEWRULE &&
3482 !list_is_first(&rule->list, &ctx->chain->rules) &&
3483 !list_is_last(&rule->list, &ctx->chain->rules)) {
3484 prule = list_prev_entry(rule, list);
3485 handle = prule->handle;
3486 }
3487 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3488 flags |= NLM_F_APPEND;
3489 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3490 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3491
3492 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3493 event, flags, ctx->family, ctx->table,
3494 ctx->chain, rule, handle, false);
3495 if (err < 0) {
3496 kfree_skb(skb);
3497 goto err;
3498 }
3499
3500 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3501 return;
3502 err:
3503 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3504 }
3505
audit_log_rule_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)3506 static void audit_log_rule_reset(const struct nft_table *table,
3507 unsigned int base_seq,
3508 unsigned int nentries)
3509 {
3510 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3511 table->name, base_seq);
3512
3513 audit_log_nfcfg(buf, table->family, nentries,
3514 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3515 kfree(buf);
3516 }
3517
3518 struct nft_rule_dump_ctx {
3519 char *table;
3520 char *chain;
3521 };
3522
__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)3523 static int __nf_tables_dump_rules(struct sk_buff *skb,
3524 unsigned int *idx,
3525 struct netlink_callback *cb,
3526 const struct nft_table *table,
3527 const struct nft_chain *chain,
3528 bool reset)
3529 {
3530 struct net *net = sock_net(skb->sk);
3531 const struct nft_rule *rule, *prule;
3532 unsigned int s_idx = cb->args[0];
3533 unsigned int entries = 0;
3534 int ret = 0;
3535 u64 handle;
3536
3537 prule = NULL;
3538 list_for_each_entry_rcu(rule, &chain->rules, list) {
3539 if (!nft_is_active(net, rule))
3540 goto cont_skip;
3541 if (*idx < s_idx)
3542 goto cont;
3543 if (prule)
3544 handle = prule->handle;
3545 else
3546 handle = 0;
3547
3548 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3549 cb->nlh->nlmsg_seq,
3550 NFT_MSG_NEWRULE,
3551 NLM_F_MULTI | NLM_F_APPEND,
3552 table->family,
3553 table, chain, rule, handle, reset) < 0) {
3554 ret = 1;
3555 break;
3556 }
3557 entries++;
3558 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3559 cont:
3560 prule = rule;
3561 cont_skip:
3562 (*idx)++;
3563 }
3564
3565 if (reset && entries)
3566 audit_log_rule_reset(table, cb->seq, entries);
3567
3568 return ret;
3569 }
3570
nf_tables_dump_rules(struct sk_buff * skb,struct netlink_callback * cb)3571 static int nf_tables_dump_rules(struct sk_buff *skb,
3572 struct netlink_callback *cb)
3573 {
3574 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3575 const struct nft_rule_dump_ctx *ctx = cb->data;
3576 struct nft_table *table;
3577 const struct nft_chain *chain;
3578 unsigned int idx = 0;
3579 struct net *net = sock_net(skb->sk);
3580 int family = nfmsg->nfgen_family;
3581 struct nftables_pernet *nft_net;
3582 bool reset = false;
3583
3584 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3585 reset = true;
3586
3587 rcu_read_lock();
3588 nft_net = nft_pernet(net);
3589 cb->seq = READ_ONCE(nft_net->base_seq);
3590
3591 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3592 if (family != NFPROTO_UNSPEC && family != table->family)
3593 continue;
3594
3595 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3596 continue;
3597
3598 if (ctx && ctx->table && ctx->chain) {
3599 struct rhlist_head *list, *tmp;
3600
3601 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3602 nft_chain_ht_params);
3603 if (!list)
3604 goto done;
3605
3606 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3607 if (!nft_is_active(net, chain))
3608 continue;
3609 __nf_tables_dump_rules(skb, &idx,
3610 cb, table, chain, reset);
3611 break;
3612 }
3613 goto done;
3614 }
3615
3616 list_for_each_entry_rcu(chain, &table->chains, list) {
3617 if (__nf_tables_dump_rules(skb, &idx,
3618 cb, table, chain, reset))
3619 goto done;
3620 }
3621
3622 if (ctx && ctx->table)
3623 break;
3624 }
3625 done:
3626 rcu_read_unlock();
3627
3628 cb->args[0] = idx;
3629 return skb->len;
3630 }
3631
nf_tables_dump_rules_start(struct netlink_callback * cb)3632 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3633 {
3634 const struct nlattr * const *nla = cb->data;
3635 struct nft_rule_dump_ctx *ctx = NULL;
3636
3637 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3638 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3639 if (!ctx)
3640 return -ENOMEM;
3641
3642 if (nla[NFTA_RULE_TABLE]) {
3643 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3644 GFP_ATOMIC);
3645 if (!ctx->table) {
3646 kfree(ctx);
3647 return -ENOMEM;
3648 }
3649 }
3650 if (nla[NFTA_RULE_CHAIN]) {
3651 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3652 GFP_ATOMIC);
3653 if (!ctx->chain) {
3654 kfree(ctx->table);
3655 kfree(ctx);
3656 return -ENOMEM;
3657 }
3658 }
3659 }
3660
3661 cb->data = ctx;
3662 return 0;
3663 }
3664
nf_tables_dump_rules_done(struct netlink_callback * cb)3665 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3666 {
3667 struct nft_rule_dump_ctx *ctx = cb->data;
3668
3669 if (ctx) {
3670 kfree(ctx->table);
3671 kfree(ctx->chain);
3672 kfree(ctx);
3673 }
3674 return 0;
3675 }
3676
3677 /* Caller must hold rcu read lock or transaction mutex */
3678 static struct sk_buff *
nf_tables_getrule_single(u32 portid,const struct nfnl_info * info,const struct nlattr * const nla[],bool reset)3679 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3680 const struct nlattr * const nla[], bool reset)
3681 {
3682 struct netlink_ext_ack *extack = info->extack;
3683 u8 genmask = nft_genmask_cur(info->net);
3684 u8 family = info->nfmsg->nfgen_family;
3685 const struct nft_chain *chain;
3686 const struct nft_rule *rule;
3687 struct net *net = info->net;
3688 struct nft_table *table;
3689 struct sk_buff *skb2;
3690 int err;
3691
3692 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3693 if (IS_ERR(table)) {
3694 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3695 return ERR_CAST(table);
3696 }
3697
3698 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3699 if (IS_ERR(chain)) {
3700 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3701 return ERR_CAST(chain);
3702 }
3703
3704 rule = nft_rule_lookup(net, chain, nla[NFTA_RULE_HANDLE]);
3705 if (IS_ERR(rule)) {
3706 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3707 return ERR_CAST(rule);
3708 }
3709
3710 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3711 if (!skb2)
3712 return ERR_PTR(-ENOMEM);
3713
3714 err = nf_tables_fill_rule_info(skb2, net, portid,
3715 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3716 family, table, chain, rule, 0, reset);
3717 if (err < 0) {
3718 kfree_skb(skb2);
3719 return ERR_PTR(err);
3720 }
3721
3722 return skb2;
3723 }
3724
nf_tables_getrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3725 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3726 const struct nlattr * const nla[])
3727 {
3728 struct nftables_pernet *nft_net = nft_pernet(info->net);
3729 u32 portid = NETLINK_CB(skb).portid;
3730 struct net *net = info->net;
3731 struct sk_buff *skb2;
3732 bool reset = false;
3733 char *buf;
3734
3735 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3736 struct netlink_dump_control c = {
3737 .start= nf_tables_dump_rules_start,
3738 .dump = nf_tables_dump_rules,
3739 .done = nf_tables_dump_rules_done,
3740 .module = THIS_MODULE,
3741 .data = (void *)nla,
3742 };
3743
3744 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3745 }
3746
3747 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3748 reset = true;
3749
3750 skb2 = nf_tables_getrule_single(portid, info, nla, reset);
3751 if (IS_ERR(skb2))
3752 return PTR_ERR(skb2);
3753
3754 if (!reset)
3755 return nfnetlink_unicast(skb2, net, portid);
3756
3757 buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3758 nla_len(nla[NFTA_RULE_TABLE]),
3759 (char *)nla_data(nla[NFTA_RULE_TABLE]),
3760 nft_net->base_seq);
3761 audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3762 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3763 kfree(buf);
3764
3765 return nfnetlink_unicast(skb2, net, portid);
3766 }
3767
nf_tables_rule_destroy(const struct nft_ctx * ctx,struct nft_rule * rule)3768 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3769 {
3770 struct nft_expr *expr, *next;
3771
3772 /*
3773 * Careful: some expressions might not be initialized in case this
3774 * is called on error from nf_tables_newrule().
3775 */
3776 expr = nft_expr_first(rule);
3777 while (nft_expr_more(rule, expr)) {
3778 next = nft_expr_next(expr);
3779 nf_tables_expr_destroy(ctx, expr);
3780 expr = next;
3781 }
3782 kfree(rule);
3783 }
3784
3785 /* can only be used if rule is no longer visible to dumps */
nf_tables_rule_release(const struct nft_ctx * ctx,struct nft_rule * rule)3786 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3787 {
3788 lockdep_commit_lock_is_held(ctx->net);
3789
3790 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3791 nf_tables_rule_destroy(ctx, rule);
3792 }
3793
3794 /** nft_chain_validate - loop detection and hook validation
3795 *
3796 * @ctx: context containing call depth and base chain
3797 * @chain: chain to validate
3798 *
3799 * Walk through the rules of the given chain and chase all jumps/gotos
3800 * and set lookups until either the jump limit is hit or all reachable
3801 * chains have been validated.
3802 */
nft_chain_validate(const struct nft_ctx * ctx,const struct nft_chain * chain)3803 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3804 {
3805 struct nft_expr *expr, *last;
3806 const struct nft_data *data;
3807 struct nft_rule *rule;
3808 int err;
3809
3810 if (ctx->level == NFT_JUMP_STACK_SIZE)
3811 return -EMLINK;
3812
3813 list_for_each_entry(rule, &chain->rules, list) {
3814 if (fatal_signal_pending(current))
3815 return -EINTR;
3816
3817 if (!nft_is_active_next(ctx->net, rule))
3818 continue;
3819
3820 nft_rule_for_each_expr(expr, last, rule) {
3821 if (!expr->ops->validate)
3822 continue;
3823
3824 /* This may call nft_chain_validate() recursively,
3825 * callers that do so must increment ctx->level.
3826 */
3827 err = expr->ops->validate(ctx, expr, &data);
3828 if (err < 0)
3829 return err;
3830 }
3831 }
3832
3833 return 0;
3834 }
3835 EXPORT_SYMBOL_GPL(nft_chain_validate);
3836
nft_table_validate(struct net * net,const struct nft_table * table)3837 static int nft_table_validate(struct net *net, const struct nft_table *table)
3838 {
3839 struct nft_chain *chain;
3840 struct nft_ctx ctx = {
3841 .net = net,
3842 .family = table->family,
3843 };
3844 int err;
3845
3846 list_for_each_entry(chain, &table->chains, list) {
3847 if (!nft_is_base_chain(chain))
3848 continue;
3849
3850 ctx.chain = chain;
3851 err = nft_chain_validate(&ctx, chain);
3852 if (err < 0)
3853 return err;
3854
3855 cond_resched();
3856 }
3857
3858 return 0;
3859 }
3860
nft_setelem_validate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)3861 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3862 const struct nft_set_iter *iter,
3863 struct nft_set_elem *elem)
3864 {
3865 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3866 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3867 const struct nft_data *data;
3868 int err;
3869
3870 if (!nft_set_elem_active(ext, iter->genmask))
3871 return 0;
3872
3873 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3874 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3875 return 0;
3876
3877 data = nft_set_ext_data(ext);
3878 switch (data->verdict.code) {
3879 case NFT_JUMP:
3880 case NFT_GOTO:
3881 pctx->level++;
3882 err = nft_chain_validate(ctx, data->verdict.chain);
3883 if (err < 0)
3884 return err;
3885 pctx->level--;
3886 break;
3887 default:
3888 break;
3889 }
3890
3891 return 0;
3892 }
3893
nft_set_catchall_validate(const struct nft_ctx * ctx,struct nft_set * set)3894 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3895 {
3896 struct nft_set_iter dummy_iter = {
3897 .genmask = nft_genmask_next(ctx->net),
3898 };
3899 struct nft_set_elem_catchall *catchall;
3900 struct nft_set_elem elem;
3901
3902 struct nft_set_ext *ext;
3903 int ret = 0;
3904
3905 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3906 ext = nft_set_elem_ext(set, catchall->elem);
3907 if (!nft_set_elem_active(ext, dummy_iter.genmask))
3908 continue;
3909
3910 elem.priv = catchall->elem;
3911 ret = nft_setelem_validate(ctx, set, &dummy_iter, &elem);
3912 if (ret < 0)
3913 return ret;
3914 }
3915
3916 return ret;
3917 }
3918
3919 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3920 const struct nft_chain *chain,
3921 const struct nlattr *nla);
3922
3923 #define NFT_RULE_MAXEXPRS 128
3924
nf_tables_newrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])3925 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3926 const struct nlattr * const nla[])
3927 {
3928 struct nftables_pernet *nft_net = nft_pernet(info->net);
3929 struct netlink_ext_ack *extack = info->extack;
3930 unsigned int size, i, n, ulen = 0, usize = 0;
3931 u8 genmask = nft_genmask_next(info->net);
3932 struct nft_rule *rule, *old_rule = NULL;
3933 struct nft_expr_info *expr_info = NULL;
3934 u8 family = info->nfmsg->nfgen_family;
3935 struct nft_flow_rule *flow = NULL;
3936 struct net *net = info->net;
3937 struct nft_userdata *udata;
3938 struct nft_table *table;
3939 struct nft_chain *chain;
3940 struct nft_trans *trans;
3941 u64 handle, pos_handle;
3942 struct nft_expr *expr;
3943 struct nft_ctx ctx;
3944 struct nlattr *tmp;
3945 int err, rem;
3946
3947 lockdep_assert_held(&nft_net->commit_mutex);
3948
3949 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3950 NETLINK_CB(skb).portid);
3951 if (IS_ERR(table)) {
3952 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3953 return PTR_ERR(table);
3954 }
3955
3956 if (nla[NFTA_RULE_CHAIN]) {
3957 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3958 genmask);
3959 if (IS_ERR(chain)) {
3960 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3961 return PTR_ERR(chain);
3962 }
3963
3964 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3965 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3966 genmask);
3967 if (IS_ERR(chain)) {
3968 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3969 return PTR_ERR(chain);
3970 }
3971 } else {
3972 return -EINVAL;
3973 }
3974
3975 if (nft_chain_is_bound(chain))
3976 return -EOPNOTSUPP;
3977
3978 if (nla[NFTA_RULE_HANDLE]) {
3979 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3980 rule = __nft_rule_lookup(net, chain, handle);
3981 if (IS_ERR(rule)) {
3982 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3983 return PTR_ERR(rule);
3984 }
3985
3986 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3987 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3988 return -EEXIST;
3989 }
3990 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3991 old_rule = rule;
3992 else
3993 return -EOPNOTSUPP;
3994 } else {
3995 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3996 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3997 return -EINVAL;
3998 handle = nf_tables_alloc_handle(table);
3999
4000 if (nla[NFTA_RULE_POSITION]) {
4001 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
4002 old_rule = __nft_rule_lookup(net, chain, pos_handle);
4003 if (IS_ERR(old_rule)) {
4004 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
4005 return PTR_ERR(old_rule);
4006 }
4007 } else if (nla[NFTA_RULE_POSITION_ID]) {
4008 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
4009 if (IS_ERR(old_rule)) {
4010 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
4011 return PTR_ERR(old_rule);
4012 }
4013 }
4014 }
4015
4016 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4017
4018 n = 0;
4019 size = 0;
4020 if (nla[NFTA_RULE_EXPRESSIONS]) {
4021 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
4022 sizeof(struct nft_expr_info),
4023 GFP_KERNEL);
4024 if (!expr_info)
4025 return -ENOMEM;
4026
4027 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
4028 err = -EINVAL;
4029 if (nla_type(tmp) != NFTA_LIST_ELEM)
4030 goto err_release_expr;
4031 if (n == NFT_RULE_MAXEXPRS)
4032 goto err_release_expr;
4033 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
4034 if (err < 0) {
4035 NL_SET_BAD_ATTR(extack, tmp);
4036 goto err_release_expr;
4037 }
4038 size += expr_info[n].ops->size;
4039 n++;
4040 }
4041 }
4042 /* Check for overflow of dlen field */
4043 err = -EFBIG;
4044 if (size >= 1 << 12)
4045 goto err_release_expr;
4046
4047 if (nla[NFTA_RULE_USERDATA]) {
4048 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4049 if (ulen > 0)
4050 usize = sizeof(struct nft_userdata) + ulen;
4051 }
4052
4053 err = -ENOMEM;
4054 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4055 if (rule == NULL)
4056 goto err_release_expr;
4057
4058 nft_activate_next(net, rule);
4059
4060 rule->handle = handle;
4061 rule->dlen = size;
4062 rule->udata = ulen ? 1 : 0;
4063
4064 if (ulen) {
4065 udata = nft_userdata(rule);
4066 udata->len = ulen - 1;
4067 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4068 }
4069
4070 expr = nft_expr_first(rule);
4071 for (i = 0; i < n; i++) {
4072 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4073 if (err < 0) {
4074 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4075 goto err_release_rule;
4076 }
4077
4078 if (expr_info[i].ops->validate)
4079 nft_validate_state_update(table, NFT_VALIDATE_NEED);
4080
4081 expr_info[i].ops = NULL;
4082 expr = nft_expr_next(expr);
4083 }
4084
4085 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4086 flow = nft_flow_rule_create(net, rule);
4087 if (IS_ERR(flow)) {
4088 err = PTR_ERR(flow);
4089 goto err_release_rule;
4090 }
4091 }
4092
4093 if (!nft_use_inc(&chain->use)) {
4094 err = -EMFILE;
4095 goto err_release_rule;
4096 }
4097
4098 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4099 if (nft_chain_binding(chain)) {
4100 err = -EOPNOTSUPP;
4101 goto err_destroy_flow_rule;
4102 }
4103
4104 err = nft_delrule(&ctx, old_rule);
4105 if (err < 0)
4106 goto err_destroy_flow_rule;
4107
4108 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4109 if (trans == NULL) {
4110 err = -ENOMEM;
4111 goto err_destroy_flow_rule;
4112 }
4113 list_add_tail_rcu(&rule->list, &old_rule->list);
4114 } else {
4115 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4116 if (!trans) {
4117 err = -ENOMEM;
4118 goto err_destroy_flow_rule;
4119 }
4120
4121 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4122 if (old_rule)
4123 list_add_rcu(&rule->list, &old_rule->list);
4124 else
4125 list_add_tail_rcu(&rule->list, &chain->rules);
4126 } else {
4127 if (old_rule)
4128 list_add_tail_rcu(&rule->list, &old_rule->list);
4129 else
4130 list_add_rcu(&rule->list, &chain->rules);
4131 }
4132 }
4133 kvfree(expr_info);
4134
4135 if (flow)
4136 nft_trans_flow_rule(trans) = flow;
4137
4138 if (table->validate_state == NFT_VALIDATE_DO)
4139 return nft_table_validate(net, table);
4140
4141 return 0;
4142
4143 err_destroy_flow_rule:
4144 nft_use_dec_restore(&chain->use);
4145 if (flow)
4146 nft_flow_rule_destroy(flow);
4147 err_release_rule:
4148 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4149 nf_tables_rule_destroy(&ctx, rule);
4150 err_release_expr:
4151 for (i = 0; i < n; i++) {
4152 if (expr_info[i].ops) {
4153 module_put(expr_info[i].ops->type->owner);
4154 if (expr_info[i].ops->type->release_ops)
4155 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4156 }
4157 }
4158 kvfree(expr_info);
4159
4160 return err;
4161 }
4162
nft_rule_lookup_byid(const struct net * net,const struct nft_chain * chain,const struct nlattr * nla)4163 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4164 const struct nft_chain *chain,
4165 const struct nlattr *nla)
4166 {
4167 struct nftables_pernet *nft_net = nft_pernet(net);
4168 u32 id = ntohl(nla_get_be32(nla));
4169 struct nft_trans *trans;
4170
4171 list_for_each_entry(trans, &nft_net->commit_list, list) {
4172 if (trans->msg_type == NFT_MSG_NEWRULE &&
4173 trans->ctx.chain == chain &&
4174 id == nft_trans_rule_id(trans))
4175 return nft_trans_rule(trans);
4176 }
4177 return ERR_PTR(-ENOENT);
4178 }
4179
nf_tables_delrule(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4180 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4181 const struct nlattr * const nla[])
4182 {
4183 struct netlink_ext_ack *extack = info->extack;
4184 u8 genmask = nft_genmask_next(info->net);
4185 u8 family = info->nfmsg->nfgen_family;
4186 struct nft_chain *chain = NULL;
4187 struct net *net = info->net;
4188 struct nft_table *table;
4189 struct nft_rule *rule;
4190 struct nft_ctx ctx;
4191 int err = 0;
4192
4193 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4194 NETLINK_CB(skb).portid);
4195 if (IS_ERR(table)) {
4196 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4197 return PTR_ERR(table);
4198 }
4199
4200 if (nla[NFTA_RULE_CHAIN]) {
4201 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4202 genmask);
4203 if (IS_ERR(chain)) {
4204 if (PTR_ERR(chain) == -ENOENT &&
4205 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4206 return 0;
4207
4208 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4209 return PTR_ERR(chain);
4210 }
4211 if (nft_chain_binding(chain))
4212 return -EOPNOTSUPP;
4213 }
4214
4215 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4216
4217 if (chain) {
4218 if (nla[NFTA_RULE_HANDLE]) {
4219 rule = nft_rule_lookup(info->net, chain, nla[NFTA_RULE_HANDLE]);
4220 if (IS_ERR(rule)) {
4221 if (PTR_ERR(rule) == -ENOENT &&
4222 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4223 return 0;
4224
4225 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4226 return PTR_ERR(rule);
4227 }
4228
4229 err = nft_delrule(&ctx, rule);
4230 } else if (nla[NFTA_RULE_ID]) {
4231 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4232 if (IS_ERR(rule)) {
4233 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4234 return PTR_ERR(rule);
4235 }
4236
4237 err = nft_delrule(&ctx, rule);
4238 } else {
4239 err = nft_delrule_by_chain(&ctx);
4240 }
4241 } else {
4242 list_for_each_entry(chain, &table->chains, list) {
4243 if (!nft_is_active_next(net, chain))
4244 continue;
4245 if (nft_chain_binding(chain))
4246 continue;
4247
4248 ctx.chain = chain;
4249 err = nft_delrule_by_chain(&ctx);
4250 if (err < 0)
4251 break;
4252 }
4253 }
4254
4255 return err;
4256 }
4257
4258 /*
4259 * Sets
4260 */
4261 static const struct nft_set_type *nft_set_types[] = {
4262 &nft_set_hash_fast_type,
4263 &nft_set_hash_type,
4264 &nft_set_rhash_type,
4265 &nft_set_bitmap_type,
4266 &nft_set_rbtree_type,
4267 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4268 &nft_set_pipapo_avx2_type,
4269 #endif
4270 &nft_set_pipapo_type,
4271 };
4272
4273 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4274 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4275 NFT_SET_EVAL)
4276
nft_set_ops_candidate(const struct nft_set_type * type,u32 flags)4277 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4278 {
4279 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4280 }
4281
4282 /*
4283 * Select a set implementation based on the data characteristics and the
4284 * given policy. The total memory use might not be known if no size is
4285 * given, in that case the amount of memory per element is used.
4286 */
4287 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)4288 nft_select_set_ops(const struct nft_ctx *ctx,
4289 const struct nlattr * const nla[],
4290 const struct nft_set_desc *desc)
4291 {
4292 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4293 const struct nft_set_ops *ops, *bops;
4294 struct nft_set_estimate est, best;
4295 const struct nft_set_type *type;
4296 u32 flags = 0;
4297 int i;
4298
4299 lockdep_assert_held(&nft_net->commit_mutex);
4300 lockdep_nfnl_nft_mutex_not_held();
4301
4302 if (nla[NFTA_SET_FLAGS] != NULL)
4303 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4304
4305 bops = NULL;
4306 best.size = ~0;
4307 best.lookup = ~0;
4308 best.space = ~0;
4309
4310 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4311 type = nft_set_types[i];
4312 ops = &type->ops;
4313
4314 if (!nft_set_ops_candidate(type, flags))
4315 continue;
4316 if (!ops->estimate(desc, flags, &est))
4317 continue;
4318
4319 switch (desc->policy) {
4320 case NFT_SET_POL_PERFORMANCE:
4321 if (est.lookup < best.lookup)
4322 break;
4323 if (est.lookup == best.lookup &&
4324 est.space < best.space)
4325 break;
4326 continue;
4327 case NFT_SET_POL_MEMORY:
4328 if (!desc->size) {
4329 if (est.space < best.space)
4330 break;
4331 if (est.space == best.space &&
4332 est.lookup < best.lookup)
4333 break;
4334 } else if (est.size < best.size || !bops) {
4335 break;
4336 }
4337 continue;
4338 default:
4339 break;
4340 }
4341
4342 bops = ops;
4343 best = est;
4344 }
4345
4346 if (bops != NULL)
4347 return bops;
4348
4349 return ERR_PTR(-EOPNOTSUPP);
4350 }
4351
4352 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4353 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4354 .len = NFT_TABLE_MAXNAMELEN - 1 },
4355 [NFTA_SET_NAME] = { .type = NLA_STRING,
4356 .len = NFT_SET_MAXNAMELEN - 1 },
4357 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4358 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4359 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4360 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4361 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4362 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4363 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4364 [NFTA_SET_ID] = { .type = NLA_U32 },
4365 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4366 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4367 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4368 .len = NFT_USERDATA_MAXLEN },
4369 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4370 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4371 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4372 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4373 };
4374
4375 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4376 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4377 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4378 };
4379
nft_set_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4380 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4381 const struct nlattr *nla, u8 genmask)
4382 {
4383 struct nft_set *set;
4384
4385 if (nla == NULL)
4386 return ERR_PTR(-EINVAL);
4387
4388 list_for_each_entry_rcu(set, &table->sets, list) {
4389 if (!nla_strcmp(nla, set->name) &&
4390 nft_active_genmask(set, genmask))
4391 return set;
4392 }
4393 return ERR_PTR(-ENOENT);
4394 }
4395
nft_set_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)4396 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4397 const struct nlattr *nla,
4398 u8 genmask)
4399 {
4400 struct nft_set *set;
4401
4402 list_for_each_entry(set, &table->sets, list) {
4403 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4404 nft_active_genmask(set, genmask))
4405 return set;
4406 }
4407 return ERR_PTR(-ENOENT);
4408 }
4409
nft_set_lookup_byid(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u8 genmask)4410 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4411 const struct nft_table *table,
4412 const struct nlattr *nla, u8 genmask)
4413 {
4414 struct nftables_pernet *nft_net = nft_pernet(net);
4415 u32 id = ntohl(nla_get_be32(nla));
4416 struct nft_trans *trans;
4417
4418 list_for_each_entry(trans, &nft_net->commit_list, list) {
4419 if (trans->msg_type == NFT_MSG_NEWSET) {
4420 struct nft_set *set = nft_trans_set(trans);
4421
4422 if (id == nft_trans_set_id(trans) &&
4423 set->table == table &&
4424 nft_active_genmask(set, genmask))
4425 return set;
4426 }
4427 }
4428 return ERR_PTR(-ENOENT);
4429 }
4430
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)4431 struct nft_set *nft_set_lookup_global(const struct net *net,
4432 const struct nft_table *table,
4433 const struct nlattr *nla_set_name,
4434 const struct nlattr *nla_set_id,
4435 u8 genmask)
4436 {
4437 struct nft_set *set;
4438
4439 set = nft_set_lookup(table, nla_set_name, genmask);
4440 if (IS_ERR(set)) {
4441 if (!nla_set_id)
4442 return set;
4443
4444 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4445 }
4446 return set;
4447 }
4448 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4449
nf_tables_set_alloc_name(struct nft_ctx * ctx,struct nft_set * set,const char * name)4450 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4451 const char *name)
4452 {
4453 const struct nft_set *i;
4454 const char *p;
4455 unsigned long *inuse;
4456 unsigned int n = 0, min = 0;
4457
4458 p = strchr(name, '%');
4459 if (p != NULL) {
4460 if (p[1] != 'd' || strchr(p + 2, '%'))
4461 return -EINVAL;
4462
4463 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4464 return -EINVAL;
4465
4466 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4467 if (inuse == NULL)
4468 return -ENOMEM;
4469 cont:
4470 list_for_each_entry(i, &ctx->table->sets, list) {
4471 int tmp;
4472
4473 if (!nft_is_active_next(ctx->net, i))
4474 continue;
4475 if (!sscanf(i->name, name, &tmp))
4476 continue;
4477 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4478 continue;
4479
4480 set_bit(tmp - min, inuse);
4481 }
4482
4483 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4484 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4485 min += BITS_PER_BYTE * PAGE_SIZE;
4486 memset(inuse, 0, PAGE_SIZE);
4487 goto cont;
4488 }
4489 free_page((unsigned long)inuse);
4490 }
4491
4492 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4493 if (!set->name)
4494 return -ENOMEM;
4495
4496 list_for_each_entry(i, &ctx->table->sets, list) {
4497 if (!nft_is_active_next(ctx->net, i))
4498 continue;
4499 if (!strcmp(set->name, i->name)) {
4500 kfree(set->name);
4501 set->name = NULL;
4502 return -ENFILE;
4503 }
4504 }
4505 return 0;
4506 }
4507
nf_msecs_to_jiffies64(const struct nlattr * nla,u64 * result)4508 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4509 {
4510 u64 ms = be64_to_cpu(nla_get_be64(nla));
4511 u64 max = (u64)(~((u64)0));
4512
4513 max = div_u64(max, NSEC_PER_MSEC);
4514 if (ms >= max)
4515 return -ERANGE;
4516
4517 ms *= NSEC_PER_MSEC;
4518 *result = nsecs_to_jiffies64(ms) ? : !!ms;
4519 return 0;
4520 }
4521
nf_jiffies64_to_msecs(u64 input)4522 __be64 nf_jiffies64_to_msecs(u64 input)
4523 {
4524 return cpu_to_be64(jiffies64_to_msecs(input));
4525 }
4526
nf_tables_fill_set_concat(struct sk_buff * skb,const struct nft_set * set)4527 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4528 const struct nft_set *set)
4529 {
4530 struct nlattr *concat, *field;
4531 int i;
4532
4533 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4534 if (!concat)
4535 return -ENOMEM;
4536
4537 for (i = 0; i < set->field_count; i++) {
4538 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4539 if (!field)
4540 return -ENOMEM;
4541
4542 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4543 htonl(set->field_len[i])))
4544 return -ENOMEM;
4545
4546 nla_nest_end(skb, field);
4547 }
4548
4549 nla_nest_end(skb, concat);
4550
4551 return 0;
4552 }
4553
nft_set_userspace_size(const struct nft_set_ops * ops,u32 size)4554 static u32 nft_set_userspace_size(const struct nft_set_ops *ops, u32 size)
4555 {
4556 if (ops->usize)
4557 return ops->usize(size);
4558
4559 return size;
4560 }
4561
nf_tables_fill_set(struct sk_buff * skb,const struct nft_ctx * ctx,const struct nft_set * set,u16 event,u16 flags)4562 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4563 const struct nft_set *set, u16 event, u16 flags)
4564 {
4565 u64 timeout = READ_ONCE(set->timeout);
4566 u32 gc_int = READ_ONCE(set->gc_int);
4567 u32 portid = ctx->portid;
4568 struct nlmsghdr *nlh;
4569 struct nlattr *nest;
4570 u32 seq = ctx->seq;
4571 int i;
4572
4573 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4574 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4575 NFNETLINK_V0, nft_base_seq(ctx->net));
4576 if (!nlh)
4577 goto nla_put_failure;
4578
4579 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4580 goto nla_put_failure;
4581 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4582 goto nla_put_failure;
4583 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4584 NFTA_SET_PAD))
4585 goto nla_put_failure;
4586
4587 if (event == NFT_MSG_DELSET) {
4588 nlmsg_end(skb, nlh);
4589 return 0;
4590 }
4591
4592 if (set->flags != 0)
4593 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4594 goto nla_put_failure;
4595
4596 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4597 goto nla_put_failure;
4598 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4599 goto nla_put_failure;
4600 if (set->flags & NFT_SET_MAP) {
4601 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4602 goto nla_put_failure;
4603 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4604 goto nla_put_failure;
4605 }
4606 if (set->flags & NFT_SET_OBJECT &&
4607 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4608 goto nla_put_failure;
4609
4610 if (timeout &&
4611 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4612 nf_jiffies64_to_msecs(timeout),
4613 NFTA_SET_PAD))
4614 goto nla_put_failure;
4615 if (gc_int &&
4616 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4617 goto nla_put_failure;
4618
4619 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4620 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4621 goto nla_put_failure;
4622 }
4623
4624 if (set->udata &&
4625 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4626 goto nla_put_failure;
4627
4628 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4629 if (!nest)
4630 goto nla_put_failure;
4631 if (set->size &&
4632 nla_put_be32(skb, NFTA_SET_DESC_SIZE,
4633 htonl(nft_set_userspace_size(set->ops, set->size))))
4634 goto nla_put_failure;
4635
4636 if (set->field_count > 1 &&
4637 nf_tables_fill_set_concat(skb, set))
4638 goto nla_put_failure;
4639
4640 nla_nest_end(skb, nest);
4641
4642 if (set->num_exprs == 1) {
4643 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4644 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4645 goto nla_put_failure;
4646
4647 nla_nest_end(skb, nest);
4648 } else if (set->num_exprs > 1) {
4649 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4650 if (nest == NULL)
4651 goto nla_put_failure;
4652
4653 for (i = 0; i < set->num_exprs; i++) {
4654 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4655 set->exprs[i], false) < 0)
4656 goto nla_put_failure;
4657 }
4658 nla_nest_end(skb, nest);
4659 }
4660
4661 nlmsg_end(skb, nlh);
4662 return 0;
4663
4664 nla_put_failure:
4665 nlmsg_trim(skb, nlh);
4666 return -1;
4667 }
4668
nf_tables_set_notify(const struct nft_ctx * ctx,const struct nft_set * set,int event,gfp_t gfp_flags)4669 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4670 const struct nft_set *set, int event,
4671 gfp_t gfp_flags)
4672 {
4673 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4674 u32 portid = ctx->portid;
4675 struct sk_buff *skb;
4676 u16 flags = 0;
4677 int err;
4678
4679 if (!ctx->report &&
4680 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4681 return;
4682
4683 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4684 if (skb == NULL)
4685 goto err;
4686
4687 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4688 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4689
4690 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4691 if (err < 0) {
4692 kfree_skb(skb);
4693 goto err;
4694 }
4695
4696 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4697 return;
4698 err:
4699 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4700 }
4701
nf_tables_dump_sets(struct sk_buff * skb,struct netlink_callback * cb)4702 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4703 {
4704 const struct nft_set *set;
4705 unsigned int idx, s_idx = cb->args[0];
4706 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4707 struct net *net = sock_net(skb->sk);
4708 struct nft_ctx *ctx = cb->data, ctx_set;
4709 struct nftables_pernet *nft_net;
4710
4711 if (cb->args[1])
4712 return skb->len;
4713
4714 rcu_read_lock();
4715 nft_net = nft_pernet(net);
4716 cb->seq = READ_ONCE(nft_net->base_seq);
4717
4718 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4719 if (ctx->family != NFPROTO_UNSPEC &&
4720 ctx->family != table->family)
4721 continue;
4722
4723 if (ctx->table && ctx->table != table)
4724 continue;
4725
4726 if (cur_table) {
4727 if (cur_table != table)
4728 continue;
4729
4730 cur_table = NULL;
4731 }
4732 idx = 0;
4733 list_for_each_entry_rcu(set, &table->sets, list) {
4734 if (idx < s_idx)
4735 goto cont;
4736 if (!nft_is_active(net, set))
4737 goto cont;
4738
4739 ctx_set = *ctx;
4740 ctx_set.table = table;
4741 ctx_set.family = table->family;
4742
4743 if (nf_tables_fill_set(skb, &ctx_set, set,
4744 NFT_MSG_NEWSET,
4745 NLM_F_MULTI) < 0) {
4746 cb->args[0] = idx;
4747 cb->args[2] = (unsigned long) table;
4748 goto done;
4749 }
4750 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4751 cont:
4752 idx++;
4753 }
4754 if (s_idx)
4755 s_idx = 0;
4756 }
4757 cb->args[1] = 1;
4758 done:
4759 rcu_read_unlock();
4760 return skb->len;
4761 }
4762
nf_tables_dump_sets_start(struct netlink_callback * cb)4763 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4764 {
4765 struct nft_ctx *ctx_dump = NULL;
4766
4767 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4768 if (ctx_dump == NULL)
4769 return -ENOMEM;
4770
4771 cb->data = ctx_dump;
4772 return 0;
4773 }
4774
nf_tables_dump_sets_done(struct netlink_callback * cb)4775 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4776 {
4777 kfree(cb->data);
4778 return 0;
4779 }
4780
4781 /* called with rcu_read_lock held */
nf_tables_getset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])4782 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4783 const struct nlattr * const nla[])
4784 {
4785 struct netlink_ext_ack *extack = info->extack;
4786 u8 genmask = nft_genmask_cur(info->net);
4787 u8 family = info->nfmsg->nfgen_family;
4788 struct nft_table *table = NULL;
4789 struct net *net = info->net;
4790 const struct nft_set *set;
4791 struct sk_buff *skb2;
4792 struct nft_ctx ctx;
4793 int err;
4794
4795 if (nla[NFTA_SET_TABLE]) {
4796 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4797 genmask, 0);
4798 if (IS_ERR(table)) {
4799 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4800 return PTR_ERR(table);
4801 }
4802 }
4803
4804 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4805
4806 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4807 struct netlink_dump_control c = {
4808 .start = nf_tables_dump_sets_start,
4809 .dump = nf_tables_dump_sets,
4810 .done = nf_tables_dump_sets_done,
4811 .data = &ctx,
4812 .module = THIS_MODULE,
4813 };
4814
4815 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4816 }
4817
4818 /* Only accept unspec with dump */
4819 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4820 return -EAFNOSUPPORT;
4821 if (!nla[NFTA_SET_TABLE])
4822 return -EINVAL;
4823
4824 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4825 if (IS_ERR(set))
4826 return PTR_ERR(set);
4827
4828 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4829 if (skb2 == NULL)
4830 return -ENOMEM;
4831
4832 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4833 if (err < 0)
4834 goto err_fill_set_info;
4835
4836 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4837
4838 err_fill_set_info:
4839 kfree_skb(skb2);
4840 return err;
4841 }
4842
4843 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4844 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4845 };
4846
nft_set_desc_concat_parse(const struct nlattr * attr,struct nft_set_desc * desc)4847 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4848 struct nft_set_desc *desc)
4849 {
4850 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4851 u32 len;
4852 int err;
4853
4854 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4855 return -E2BIG;
4856
4857 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4858 nft_concat_policy, NULL);
4859 if (err < 0)
4860 return err;
4861
4862 if (!tb[NFTA_SET_FIELD_LEN])
4863 return -EINVAL;
4864
4865 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4866 if (!len || len > U8_MAX)
4867 return -EINVAL;
4868
4869 desc->field_len[desc->field_count++] = len;
4870
4871 return 0;
4872 }
4873
nft_set_desc_concat(struct nft_set_desc * desc,const struct nlattr * nla)4874 static int nft_set_desc_concat(struct nft_set_desc *desc,
4875 const struct nlattr *nla)
4876 {
4877 u32 len = 0, num_regs;
4878 struct nlattr *attr;
4879 int rem, err, i;
4880
4881 nla_for_each_nested(attr, nla, rem) {
4882 if (nla_type(attr) != NFTA_LIST_ELEM)
4883 return -EINVAL;
4884
4885 err = nft_set_desc_concat_parse(attr, desc);
4886 if (err < 0)
4887 return err;
4888 }
4889
4890 for (i = 0; i < desc->field_count; i++)
4891 len += round_up(desc->field_len[i], sizeof(u32));
4892
4893 if (len != desc->klen)
4894 return -EINVAL;
4895
4896 num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4897 if (num_regs > NFT_REG32_COUNT)
4898 return -E2BIG;
4899
4900 return 0;
4901 }
4902
nf_tables_set_desc_parse(struct nft_set_desc * desc,const struct nlattr * nla)4903 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4904 const struct nlattr *nla)
4905 {
4906 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4907 int err;
4908
4909 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4910 nft_set_desc_policy, NULL);
4911 if (err < 0)
4912 return err;
4913
4914 if (da[NFTA_SET_DESC_SIZE] != NULL)
4915 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4916 if (da[NFTA_SET_DESC_CONCAT])
4917 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4918
4919 return err;
4920 }
4921
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)4922 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4923 const struct nlattr * const *nla,
4924 struct nft_expr **exprs, int *num_exprs,
4925 u32 flags)
4926 {
4927 struct nft_expr *expr;
4928 int err, i;
4929
4930 if (nla[NFTA_SET_EXPR]) {
4931 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4932 if (IS_ERR(expr)) {
4933 err = PTR_ERR(expr);
4934 goto err_set_expr_alloc;
4935 }
4936 exprs[0] = expr;
4937 (*num_exprs)++;
4938 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4939 struct nlattr *tmp;
4940 int left;
4941
4942 if (!(flags & NFT_SET_EXPR)) {
4943 err = -EINVAL;
4944 goto err_set_expr_alloc;
4945 }
4946 i = 0;
4947 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4948 if (i == NFT_SET_EXPR_MAX) {
4949 err = -E2BIG;
4950 goto err_set_expr_alloc;
4951 }
4952 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4953 err = -EINVAL;
4954 goto err_set_expr_alloc;
4955 }
4956 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4957 if (IS_ERR(expr)) {
4958 err = PTR_ERR(expr);
4959 goto err_set_expr_alloc;
4960 }
4961 exprs[i++] = expr;
4962 (*num_exprs)++;
4963 }
4964 }
4965
4966 return 0;
4967
4968 err_set_expr_alloc:
4969 for (i = 0; i < *num_exprs; i++)
4970 nft_expr_destroy(ctx, exprs[i]);
4971
4972 return err;
4973 }
4974
nft_set_is_same(const struct nft_set * set,const struct nft_set_desc * desc,struct nft_expr * exprs[],u32 num_exprs,u32 flags)4975 static bool nft_set_is_same(const struct nft_set *set,
4976 const struct nft_set_desc *desc,
4977 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4978 {
4979 int i;
4980
4981 if (set->ktype != desc->ktype ||
4982 set->dtype != desc->dtype ||
4983 set->flags != flags ||
4984 set->klen != desc->klen ||
4985 set->dlen != desc->dlen ||
4986 set->field_count != desc->field_count ||
4987 set->num_exprs != num_exprs)
4988 return false;
4989
4990 for (i = 0; i < desc->field_count; i++) {
4991 if (set->field_len[i] != desc->field_len[i])
4992 return false;
4993 }
4994
4995 for (i = 0; i < num_exprs; i++) {
4996 if (set->exprs[i]->ops != exprs[i]->ops)
4997 return false;
4998 }
4999
5000 return true;
5001 }
5002
nft_set_kernel_size(const struct nft_set_ops * ops,const struct nft_set_desc * desc)5003 static u32 nft_set_kernel_size(const struct nft_set_ops *ops,
5004 const struct nft_set_desc *desc)
5005 {
5006 if (ops->ksize)
5007 return ops->ksize(desc->size);
5008
5009 return desc->size;
5010 }
5011
nf_tables_newset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])5012 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
5013 const struct nlattr * const nla[])
5014 {
5015 struct netlink_ext_ack *extack = info->extack;
5016 u8 genmask = nft_genmask_next(info->net);
5017 u8 family = info->nfmsg->nfgen_family;
5018 const struct nft_set_ops *ops;
5019 struct net *net = info->net;
5020 struct nft_set_desc desc;
5021 struct nft_table *table;
5022 unsigned char *udata;
5023 struct nft_set *set;
5024 struct nft_ctx ctx;
5025 size_t alloc_size;
5026 int num_exprs = 0;
5027 char *name;
5028 int err, i;
5029 u16 udlen;
5030 u32 flags;
5031 u64 size;
5032
5033 if (nla[NFTA_SET_TABLE] == NULL ||
5034 nla[NFTA_SET_NAME] == NULL ||
5035 nla[NFTA_SET_KEY_LEN] == NULL ||
5036 nla[NFTA_SET_ID] == NULL)
5037 return -EINVAL;
5038
5039 memset(&desc, 0, sizeof(desc));
5040
5041 desc.ktype = NFT_DATA_VALUE;
5042 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
5043 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
5044 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
5045 return -EINVAL;
5046 }
5047
5048 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
5049 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
5050 return -EINVAL;
5051
5052 flags = 0;
5053 if (nla[NFTA_SET_FLAGS] != NULL) {
5054 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
5055 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5056 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5057 NFT_SET_MAP | NFT_SET_EVAL |
5058 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5059 return -EOPNOTSUPP;
5060 /* Only one of these operations is supported */
5061 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5062 (NFT_SET_MAP | NFT_SET_OBJECT))
5063 return -EOPNOTSUPP;
5064 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5065 (NFT_SET_EVAL | NFT_SET_OBJECT))
5066 return -EOPNOTSUPP;
5067 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5068 (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5069 return -EOPNOTSUPP;
5070 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5071 (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5072 return -EOPNOTSUPP;
5073 }
5074
5075 desc.dtype = 0;
5076 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5077 if (!(flags & NFT_SET_MAP))
5078 return -EINVAL;
5079
5080 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5081 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5082 desc.dtype != NFT_DATA_VERDICT)
5083 return -EINVAL;
5084
5085 if (desc.dtype != NFT_DATA_VERDICT) {
5086 if (nla[NFTA_SET_DATA_LEN] == NULL)
5087 return -EINVAL;
5088 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5089 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5090 return -EINVAL;
5091 } else
5092 desc.dlen = sizeof(struct nft_verdict);
5093 } else if (flags & NFT_SET_MAP)
5094 return -EINVAL;
5095
5096 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5097 if (!(flags & NFT_SET_OBJECT))
5098 return -EINVAL;
5099
5100 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5101 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5102 desc.objtype > NFT_OBJECT_MAX)
5103 return -EOPNOTSUPP;
5104 } else if (flags & NFT_SET_OBJECT)
5105 return -EINVAL;
5106 else
5107 desc.objtype = NFT_OBJECT_UNSPEC;
5108
5109 desc.timeout = 0;
5110 if (nla[NFTA_SET_TIMEOUT] != NULL) {
5111 if (!(flags & NFT_SET_TIMEOUT))
5112 return -EINVAL;
5113
5114 if (flags & NFT_SET_ANONYMOUS)
5115 return -EOPNOTSUPP;
5116
5117 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5118 if (err)
5119 return err;
5120 }
5121 desc.gc_int = 0;
5122 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5123 if (!(flags & NFT_SET_TIMEOUT))
5124 return -EINVAL;
5125
5126 if (flags & NFT_SET_ANONYMOUS)
5127 return -EOPNOTSUPP;
5128
5129 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5130 }
5131
5132 desc.policy = NFT_SET_POL_PERFORMANCE;
5133 if (nla[NFTA_SET_POLICY] != NULL) {
5134 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5135 switch (desc.policy) {
5136 case NFT_SET_POL_PERFORMANCE:
5137 case NFT_SET_POL_MEMORY:
5138 break;
5139 default:
5140 return -EOPNOTSUPP;
5141 }
5142 }
5143
5144 if (nla[NFTA_SET_DESC] != NULL) {
5145 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5146 if (err < 0)
5147 return err;
5148
5149 if (desc.field_count > 1) {
5150 if (!(flags & NFT_SET_CONCAT))
5151 return -EINVAL;
5152 } else if (flags & NFT_SET_CONCAT) {
5153 return -EINVAL;
5154 }
5155 } else if (flags & NFT_SET_CONCAT) {
5156 return -EINVAL;
5157 }
5158
5159 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5160 desc.expr = true;
5161
5162 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5163 NETLINK_CB(skb).portid);
5164 if (IS_ERR(table)) {
5165 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5166 return PTR_ERR(table);
5167 }
5168
5169 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5170
5171 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5172 if (IS_ERR(set)) {
5173 if (PTR_ERR(set) != -ENOENT) {
5174 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5175 return PTR_ERR(set);
5176 }
5177 } else {
5178 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5179
5180 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5181 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5182 return -EEXIST;
5183 }
5184 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5185 return -EOPNOTSUPP;
5186
5187 if (nft_set_is_anonymous(set))
5188 return -EOPNOTSUPP;
5189
5190 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5191 if (err < 0)
5192 return err;
5193
5194 if (desc.size)
5195 desc.size = nft_set_kernel_size(set->ops, &desc);
5196
5197 err = 0;
5198 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5199 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5200 err = -EEXIST;
5201 }
5202
5203 for (i = 0; i < num_exprs; i++)
5204 nft_expr_destroy(&ctx, exprs[i]);
5205
5206 if (err < 0)
5207 return err;
5208
5209 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5210 }
5211
5212 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5213 return -ENOENT;
5214
5215 ops = nft_select_set_ops(&ctx, nla, &desc);
5216 if (IS_ERR(ops))
5217 return PTR_ERR(ops);
5218
5219 if (desc.size)
5220 desc.size = nft_set_kernel_size(ops, &desc);
5221
5222 udlen = 0;
5223 if (nla[NFTA_SET_USERDATA])
5224 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5225
5226 size = 0;
5227 if (ops->privsize != NULL)
5228 size = ops->privsize(nla, &desc);
5229 alloc_size = sizeof(*set) + size + udlen;
5230 if (alloc_size < size || alloc_size > INT_MAX)
5231 return -ENOMEM;
5232
5233 if (!nft_use_inc(&table->use))
5234 return -EMFILE;
5235
5236 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5237 if (!set) {
5238 err = -ENOMEM;
5239 goto err_alloc;
5240 }
5241
5242 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5243 if (!name) {
5244 err = -ENOMEM;
5245 goto err_set_name;
5246 }
5247
5248 err = nf_tables_set_alloc_name(&ctx, set, name);
5249 kfree(name);
5250 if (err < 0)
5251 goto err_set_name;
5252
5253 udata = NULL;
5254 if (udlen) {
5255 udata = set->data + size;
5256 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5257 }
5258
5259 INIT_LIST_HEAD(&set->bindings);
5260 INIT_LIST_HEAD(&set->catchall_list);
5261 refcount_set(&set->refs, 1);
5262 set->table = table;
5263 write_pnet(&set->net, net);
5264 set->ops = ops;
5265 set->ktype = desc.ktype;
5266 set->klen = desc.klen;
5267 set->dtype = desc.dtype;
5268 set->objtype = desc.objtype;
5269 set->dlen = desc.dlen;
5270 set->flags = flags;
5271 set->size = desc.size;
5272 set->policy = desc.policy;
5273 set->udlen = udlen;
5274 set->udata = udata;
5275 set->timeout = desc.timeout;
5276 set->gc_int = desc.gc_int;
5277
5278 set->field_count = desc.field_count;
5279 for (i = 0; i < desc.field_count; i++)
5280 set->field_len[i] = desc.field_len[i];
5281
5282 err = ops->init(set, &desc, nla);
5283 if (err < 0)
5284 goto err_set_init;
5285
5286 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5287 if (err < 0)
5288 goto err_set_destroy;
5289
5290 set->num_exprs = num_exprs;
5291 set->handle = nf_tables_alloc_handle(table);
5292 INIT_LIST_HEAD(&set->pending_update);
5293
5294 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5295 if (err < 0)
5296 goto err_set_expr_alloc;
5297
5298 list_add_tail_rcu(&set->list, &table->sets);
5299
5300 return 0;
5301
5302 err_set_expr_alloc:
5303 for (i = 0; i < set->num_exprs; i++)
5304 nft_expr_destroy(&ctx, set->exprs[i]);
5305 err_set_destroy:
5306 ops->destroy(&ctx, set);
5307 err_set_init:
5308 kfree(set->name);
5309 err_set_name:
5310 kvfree(set);
5311 err_alloc:
5312 nft_use_dec_restore(&table->use);
5313
5314 return err;
5315 }
5316
nft_set_catchall_destroy(const struct nft_ctx * ctx,struct nft_set * set)5317 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5318 struct nft_set *set)
5319 {
5320 struct nft_set_elem_catchall *next, *catchall;
5321
5322 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5323 list_del_rcu(&catchall->list);
5324 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5325 kfree_rcu(catchall, rcu);
5326 }
5327 }
5328
nft_set_put(struct nft_set * set)5329 static void nft_set_put(struct nft_set *set)
5330 {
5331 if (refcount_dec_and_test(&set->refs)) {
5332 kfree(set->name);
5333 kvfree(set);
5334 }
5335 }
5336
nft_set_destroy(const struct nft_ctx * ctx,struct nft_set * set)5337 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5338 {
5339 int i;
5340
5341 if (WARN_ON(set->use > 0))
5342 return;
5343
5344 for (i = 0; i < set->num_exprs; i++)
5345 nft_expr_destroy(ctx, set->exprs[i]);
5346
5347 set->ops->destroy(ctx, set);
5348 nft_set_catchall_destroy(ctx, set);
5349 nft_set_put(set);
5350 }
5351
nf_tables_delset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])5352 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5353 const struct nlattr * const nla[])
5354 {
5355 struct netlink_ext_ack *extack = info->extack;
5356 u8 genmask = nft_genmask_next(info->net);
5357 u8 family = info->nfmsg->nfgen_family;
5358 struct net *net = info->net;
5359 const struct nlattr *attr;
5360 struct nft_table *table;
5361 struct nft_set *set;
5362 struct nft_ctx ctx;
5363
5364 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5365 return -EAFNOSUPPORT;
5366
5367 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5368 genmask, NETLINK_CB(skb).portid);
5369 if (IS_ERR(table)) {
5370 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5371 return PTR_ERR(table);
5372 }
5373
5374 if (nla[NFTA_SET_HANDLE]) {
5375 attr = nla[NFTA_SET_HANDLE];
5376 set = nft_set_lookup_byhandle(table, attr, genmask);
5377 } else {
5378 attr = nla[NFTA_SET_NAME];
5379 set = nft_set_lookup(table, attr, genmask);
5380 }
5381
5382 if (IS_ERR(set)) {
5383 if (PTR_ERR(set) == -ENOENT &&
5384 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5385 return 0;
5386
5387 NL_SET_BAD_ATTR(extack, attr);
5388 return PTR_ERR(set);
5389 }
5390 if (set->use ||
5391 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5392 atomic_read(&set->nelems) > 0)) {
5393 NL_SET_BAD_ATTR(extack, attr);
5394 return -EBUSY;
5395 }
5396
5397 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5398
5399 return nft_delset(&ctx, set);
5400 }
5401
5402 static int nft_validate_register_store(const struct nft_ctx *ctx,
5403 enum nft_registers reg,
5404 const struct nft_data *data,
5405 enum nft_data_types type,
5406 unsigned int len);
5407
nft_setelem_data_validate(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)5408 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5409 struct nft_set *set,
5410 struct nft_set_elem *elem)
5411 {
5412 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5413 enum nft_registers dreg;
5414
5415 dreg = nft_type_to_reg(set->dtype);
5416 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5417 set->dtype == NFT_DATA_VERDICT ?
5418 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5419 set->dlen);
5420 }
5421
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)5422 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5423 struct nft_set *set,
5424 const struct nft_set_iter *iter,
5425 struct nft_set_elem *elem)
5426 {
5427 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5428
5429 if (!nft_set_elem_active(ext, iter->genmask))
5430 return 0;
5431
5432 return nft_setelem_data_validate(ctx, set, elem);
5433 }
5434
nft_set_catchall_bind_check(const struct nft_ctx * ctx,struct nft_set * set)5435 static int nft_set_catchall_bind_check(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 int ret = 0;
5443
5444 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5445 ext = nft_set_elem_ext(set, catchall->elem);
5446 if (!nft_set_elem_active(ext, genmask))
5447 continue;
5448
5449 elem.priv = catchall->elem;
5450 ret = nft_setelem_data_validate(ctx, set, &elem);
5451 if (ret < 0)
5452 break;
5453 }
5454
5455 return ret;
5456 }
5457
nf_tables_bind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding)5458 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5459 struct nft_set_binding *binding)
5460 {
5461 struct nft_set_binding *i;
5462 struct nft_set_iter iter;
5463
5464 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5465 return -EBUSY;
5466
5467 if (binding->flags & NFT_SET_MAP) {
5468 /* If the set is already bound to the same chain all
5469 * jumps are already validated for that chain.
5470 */
5471 list_for_each_entry(i, &set->bindings, list) {
5472 if (i->flags & NFT_SET_MAP &&
5473 i->chain == binding->chain)
5474 goto bind;
5475 }
5476
5477 iter.genmask = nft_genmask_next(ctx->net);
5478 iter.type = NFT_ITER_UPDATE;
5479 iter.skip = 0;
5480 iter.count = 0;
5481 iter.err = 0;
5482 iter.fn = nf_tables_bind_check_setelem;
5483
5484 set->ops->walk(ctx, set, &iter);
5485 if (!iter.err)
5486 iter.err = nft_set_catchall_bind_check(ctx, set);
5487
5488 if (iter.err < 0)
5489 return iter.err;
5490 }
5491 bind:
5492 if (!nft_use_inc(&set->use))
5493 return -EMFILE;
5494
5495 binding->chain = ctx->chain;
5496 list_add_tail_rcu(&binding->list, &set->bindings);
5497 nft_set_trans_bind(ctx, set);
5498
5499 return 0;
5500 }
5501 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5502
nf_tables_unbind_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,bool event)5503 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5504 struct nft_set_binding *binding, bool event)
5505 {
5506 list_del_rcu(&binding->list);
5507
5508 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5509 list_del_rcu(&set->list);
5510 set->dead = 1;
5511 if (event)
5512 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5513 GFP_KERNEL);
5514 }
5515 }
5516
5517 static void nft_setelem_data_activate(const struct net *net,
5518 const struct nft_set *set,
5519 struct nft_set_elem *elem);
5520
nft_mapelem_activate(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5521 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5522 struct nft_set *set,
5523 const struct nft_set_iter *iter,
5524 struct nft_set_elem *elem)
5525 {
5526 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5527
5528 /* called from abort path, reverse check to undo changes. */
5529 if (nft_set_elem_active(ext, iter->genmask))
5530 return 0;
5531
5532 nft_clear(ctx->net, ext);
5533 nft_setelem_data_activate(ctx->net, set, elem);
5534
5535 return 0;
5536 }
5537
nft_map_catchall_activate(const struct nft_ctx * ctx,struct nft_set * set)5538 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5539 struct nft_set *set)
5540 {
5541 u8 genmask = nft_genmask_next(ctx->net);
5542 struct nft_set_elem_catchall *catchall;
5543 struct nft_set_elem elem;
5544 struct nft_set_ext *ext;
5545
5546 list_for_each_entry(catchall, &set->catchall_list, list) {
5547 ext = nft_set_elem_ext(set, catchall->elem);
5548 if (!nft_set_elem_active(ext, genmask))
5549 continue;
5550
5551 nft_clear(ctx->net, ext);
5552 elem.priv = catchall->elem;
5553 nft_setelem_data_activate(ctx->net, set, &elem);
5554 break;
5555 }
5556 }
5557
nft_map_activate(const struct nft_ctx * ctx,struct nft_set * set)5558 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5559 {
5560 struct nft_set_iter iter = {
5561 .genmask = nft_genmask_next(ctx->net),
5562 .type = NFT_ITER_UPDATE,
5563 .fn = nft_mapelem_activate,
5564 };
5565
5566 set->ops->walk(ctx, set, &iter);
5567 WARN_ON_ONCE(iter.err);
5568
5569 nft_map_catchall_activate(ctx, set);
5570 }
5571
nf_tables_activate_set(const struct nft_ctx * ctx,struct nft_set * set)5572 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5573 {
5574 if (nft_set_is_anonymous(set)) {
5575 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5576 nft_map_activate(ctx, set);
5577
5578 nft_clear(ctx->net, set);
5579 }
5580
5581 nft_use_inc_restore(&set->use);
5582 }
5583 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5584
nf_tables_deactivate_set(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_binding * binding,enum nft_trans_phase phase)5585 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5586 struct nft_set_binding *binding,
5587 enum nft_trans_phase phase)
5588 {
5589 lockdep_commit_lock_is_held(ctx->net);
5590
5591 switch (phase) {
5592 case NFT_TRANS_PREPARE_ERROR:
5593 nft_set_trans_unbind(ctx, set);
5594 if (nft_set_is_anonymous(set))
5595 nft_deactivate_next(ctx->net, set);
5596 else
5597 list_del_rcu(&binding->list);
5598
5599 nft_use_dec(&set->use);
5600 break;
5601 case NFT_TRANS_PREPARE:
5602 if (nft_set_is_anonymous(set)) {
5603 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5604 nft_map_deactivate(ctx, set);
5605
5606 nft_deactivate_next(ctx->net, set);
5607 }
5608 nft_use_dec(&set->use);
5609 return;
5610 case NFT_TRANS_ABORT:
5611 case NFT_TRANS_RELEASE:
5612 if (nft_set_is_anonymous(set) &&
5613 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5614 nft_map_deactivate(ctx, set);
5615
5616 nft_use_dec(&set->use);
5617 fallthrough;
5618 default:
5619 nf_tables_unbind_set(ctx, set, binding,
5620 phase == NFT_TRANS_COMMIT);
5621 }
5622 }
5623 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5624
nf_tables_destroy_set(const struct nft_ctx * ctx,struct nft_set * set)5625 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5626 {
5627 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5628 nft_set_destroy(ctx, set);
5629 }
5630 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5631
5632 const struct nft_set_ext_type nft_set_ext_types[] = {
5633 [NFT_SET_EXT_KEY] = {
5634 .align = __alignof__(u32),
5635 },
5636 [NFT_SET_EXT_DATA] = {
5637 .align = __alignof__(u32),
5638 },
5639 [NFT_SET_EXT_EXPRESSIONS] = {
5640 .align = __alignof__(struct nft_set_elem_expr),
5641 },
5642 [NFT_SET_EXT_OBJREF] = {
5643 .len = sizeof(struct nft_object *),
5644 .align = __alignof__(struct nft_object *),
5645 },
5646 [NFT_SET_EXT_FLAGS] = {
5647 .len = sizeof(u8),
5648 .align = __alignof__(u8),
5649 },
5650 [NFT_SET_EXT_TIMEOUT] = {
5651 .len = sizeof(u64),
5652 .align = __alignof__(u64),
5653 },
5654 [NFT_SET_EXT_EXPIRATION] = {
5655 .len = sizeof(u64),
5656 .align = __alignof__(u64),
5657 },
5658 [NFT_SET_EXT_USERDATA] = {
5659 .len = sizeof(struct nft_userdata),
5660 .align = __alignof__(struct nft_userdata),
5661 },
5662 [NFT_SET_EXT_KEY_END] = {
5663 .align = __alignof__(u32),
5664 },
5665 };
5666
5667 /*
5668 * Set elements
5669 */
5670
5671 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5672 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5673 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5674 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5675 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5676 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5677 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5678 .len = NFT_USERDATA_MAXLEN },
5679 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5680 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5681 .len = NFT_OBJ_MAXNAMELEN - 1 },
5682 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5683 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5684 };
5685
5686 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5687 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5688 .len = NFT_TABLE_MAXNAMELEN - 1 },
5689 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5690 .len = NFT_SET_MAXNAMELEN - 1 },
5691 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5692 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5693 };
5694
nft_set_elem_expr_dump(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_ext * ext,bool reset)5695 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5696 const struct nft_set *set,
5697 const struct nft_set_ext *ext,
5698 bool reset)
5699 {
5700 struct nft_set_elem_expr *elem_expr;
5701 u32 size, num_exprs = 0;
5702 struct nft_expr *expr;
5703 struct nlattr *nest;
5704
5705 elem_expr = nft_set_ext_expr(ext);
5706 nft_setelem_expr_foreach(expr, elem_expr, size)
5707 num_exprs++;
5708
5709 if (num_exprs == 1) {
5710 expr = nft_setelem_expr_at(elem_expr, 0);
5711 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5712 return -1;
5713
5714 return 0;
5715 } else if (num_exprs > 1) {
5716 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5717 if (nest == NULL)
5718 goto nla_put_failure;
5719
5720 nft_setelem_expr_foreach(expr, elem_expr, size) {
5721 expr = nft_setelem_expr_at(elem_expr, size);
5722 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5723 goto nla_put_failure;
5724 }
5725 nla_nest_end(skb, nest);
5726 }
5727 return 0;
5728
5729 nla_put_failure:
5730 return -1;
5731 }
5732
nf_tables_fill_setelem(struct sk_buff * skb,const struct nft_set * set,const struct nft_set_elem * elem,bool reset)5733 static int nf_tables_fill_setelem(struct sk_buff *skb,
5734 const struct nft_set *set,
5735 const struct nft_set_elem *elem,
5736 bool reset)
5737 {
5738 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5739 unsigned char *b = skb_tail_pointer(skb);
5740 struct nlattr *nest;
5741
5742 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5743 if (nest == NULL)
5744 goto nla_put_failure;
5745
5746 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5747 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5748 NFT_DATA_VALUE, set->klen) < 0)
5749 goto nla_put_failure;
5750
5751 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5752 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5753 NFT_DATA_VALUE, set->klen) < 0)
5754 goto nla_put_failure;
5755
5756 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5757 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5758 nft_set_datatype(set), set->dlen) < 0)
5759 goto nla_put_failure;
5760
5761 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5762 nft_set_elem_expr_dump(skb, set, ext, reset))
5763 goto nla_put_failure;
5764
5765 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5766 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5767 (*nft_set_ext_obj(ext))->key.name) < 0)
5768 goto nla_put_failure;
5769
5770 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5771 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5772 htonl(*nft_set_ext_flags(ext))))
5773 goto nla_put_failure;
5774
5775 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5776 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5777 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5778 NFTA_SET_ELEM_PAD))
5779 goto nla_put_failure;
5780
5781 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5782 u64 expires, now = get_jiffies_64();
5783
5784 expires = *nft_set_ext_expiration(ext);
5785 if (time_before64(now, expires))
5786 expires -= now;
5787 else
5788 expires = 0;
5789
5790 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5791 nf_jiffies64_to_msecs(expires),
5792 NFTA_SET_ELEM_PAD))
5793 goto nla_put_failure;
5794 }
5795
5796 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5797 struct nft_userdata *udata;
5798
5799 udata = nft_set_ext_userdata(ext);
5800 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5801 udata->len + 1, udata->data))
5802 goto nla_put_failure;
5803 }
5804
5805 nla_nest_end(skb, nest);
5806 return 0;
5807
5808 nla_put_failure:
5809 nlmsg_trim(skb, b);
5810 return -EMSGSIZE;
5811 }
5812
5813 struct nft_set_dump_args {
5814 const struct netlink_callback *cb;
5815 struct nft_set_iter iter;
5816 struct sk_buff *skb;
5817 bool reset;
5818 };
5819
nf_tables_dump_setelem(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)5820 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5821 struct nft_set *set,
5822 const struct nft_set_iter *iter,
5823 struct nft_set_elem *elem)
5824 {
5825 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5826 struct nft_set_dump_args *args;
5827
5828 if (!nft_set_elem_active(ext, iter->genmask))
5829 return 0;
5830
5831 if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5832 return 0;
5833
5834 args = container_of(iter, struct nft_set_dump_args, iter);
5835 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5836 }
5837
audit_log_nft_set_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)5838 static void audit_log_nft_set_reset(const struct nft_table *table,
5839 unsigned int base_seq,
5840 unsigned int nentries)
5841 {
5842 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5843
5844 audit_log_nfcfg(buf, table->family, nentries,
5845 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5846 kfree(buf);
5847 }
5848
5849 struct nft_set_dump_ctx {
5850 const struct nft_set *set;
5851 struct nft_ctx ctx;
5852 };
5853
nft_set_catchall_dump(struct net * net,struct sk_buff * skb,const struct nft_set * set,bool reset,unsigned int base_seq)5854 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5855 const struct nft_set *set, bool reset,
5856 unsigned int base_seq)
5857 {
5858 struct nft_set_elem_catchall *catchall;
5859 u8 genmask = nft_genmask_cur(net);
5860 struct nft_set_elem elem;
5861 struct nft_set_ext *ext;
5862 int ret = 0;
5863
5864 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5865 ext = nft_set_elem_ext(set, catchall->elem);
5866 if (!nft_set_elem_active(ext, genmask) ||
5867 nft_set_elem_expired(ext))
5868 continue;
5869
5870 elem.priv = catchall->elem;
5871 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5872 if (reset && !ret)
5873 audit_log_nft_set_reset(set->table, base_seq, 1);
5874 break;
5875 }
5876
5877 return ret;
5878 }
5879
nf_tables_dump_set(struct sk_buff * skb,struct netlink_callback * cb)5880 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5881 {
5882 struct nft_set_dump_ctx *dump_ctx = cb->data;
5883 struct net *net = sock_net(skb->sk);
5884 struct nftables_pernet *nft_net;
5885 struct nft_table *table;
5886 struct nft_set *set;
5887 struct nft_set_dump_args args;
5888 bool set_found = false;
5889 struct nlmsghdr *nlh;
5890 struct nlattr *nest;
5891 bool reset = false;
5892 u32 portid, seq;
5893 int event;
5894
5895 rcu_read_lock();
5896 nft_net = nft_pernet(net);
5897 cb->seq = READ_ONCE(nft_net->base_seq);
5898
5899 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5900 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5901 dump_ctx->ctx.family != table->family)
5902 continue;
5903
5904 if (table != dump_ctx->ctx.table)
5905 continue;
5906
5907 list_for_each_entry_rcu(set, &table->sets, list) {
5908 if (set == dump_ctx->set) {
5909 set_found = true;
5910 break;
5911 }
5912 }
5913 break;
5914 }
5915
5916 if (!set_found) {
5917 rcu_read_unlock();
5918 return -ENOENT;
5919 }
5920
5921 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5922 portid = NETLINK_CB(cb->skb).portid;
5923 seq = cb->nlh->nlmsg_seq;
5924
5925 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5926 table->family, NFNETLINK_V0, nft_base_seq(net));
5927 if (!nlh)
5928 goto nla_put_failure;
5929
5930 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5931 goto nla_put_failure;
5932 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5933 goto nla_put_failure;
5934
5935 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5936 if (nest == NULL)
5937 goto nla_put_failure;
5938
5939 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5940 reset = true;
5941
5942 args.cb = cb;
5943 args.skb = skb;
5944 args.reset = reset;
5945 args.iter.genmask = nft_genmask_cur(net);
5946 args.iter.type = NFT_ITER_READ;
5947 args.iter.skip = cb->args[0];
5948 args.iter.count = 0;
5949 args.iter.err = 0;
5950 args.iter.fn = nf_tables_dump_setelem;
5951 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5952
5953 if (!args.iter.err && args.iter.count == cb->args[0])
5954 args.iter.err = nft_set_catchall_dump(net, skb, set,
5955 reset, cb->seq);
5956 nla_nest_end(skb, nest);
5957 nlmsg_end(skb, nlh);
5958
5959 if (reset && args.iter.count > args.iter.skip)
5960 audit_log_nft_set_reset(table, cb->seq,
5961 args.iter.count - args.iter.skip);
5962
5963 rcu_read_unlock();
5964
5965 if (args.iter.err && args.iter.err != -EMSGSIZE)
5966 return args.iter.err;
5967 if (args.iter.count == cb->args[0])
5968 return 0;
5969
5970 cb->args[0] = args.iter.count;
5971 return skb->len;
5972
5973 nla_put_failure:
5974 rcu_read_unlock();
5975 return -ENOSPC;
5976 }
5977
nf_tables_dump_set_start(struct netlink_callback * cb)5978 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5979 {
5980 struct nft_set_dump_ctx *dump_ctx = cb->data;
5981
5982 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5983
5984 return cb->data ? 0 : -ENOMEM;
5985 }
5986
nf_tables_dump_set_done(struct netlink_callback * cb)5987 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5988 {
5989 kfree(cb->data);
5990 return 0;
5991 }
5992
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)5993 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5994 const struct nft_ctx *ctx, u32 seq,
5995 u32 portid, int event, u16 flags,
5996 const struct nft_set *set,
5997 const struct nft_set_elem *elem,
5998 bool reset)
5999 {
6000 struct nlmsghdr *nlh;
6001 struct nlattr *nest;
6002 int err;
6003
6004 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6005 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
6006 NFNETLINK_V0, nft_base_seq(ctx->net));
6007 if (!nlh)
6008 goto nla_put_failure;
6009
6010 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
6011 goto nla_put_failure;
6012 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
6013 goto nla_put_failure;
6014
6015 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
6016 if (nest == NULL)
6017 goto nla_put_failure;
6018
6019 err = nf_tables_fill_setelem(skb, set, elem, reset);
6020 if (err < 0)
6021 goto nla_put_failure;
6022
6023 nla_nest_end(skb, nest);
6024
6025 nlmsg_end(skb, nlh);
6026 return 0;
6027
6028 nla_put_failure:
6029 nlmsg_trim(skb, nlh);
6030 return -1;
6031 }
6032
nft_setelem_parse_flags(const struct nft_set * set,const struct nlattr * attr,u32 * flags)6033 static int nft_setelem_parse_flags(const struct nft_set *set,
6034 const struct nlattr *attr, u32 *flags)
6035 {
6036 if (attr == NULL)
6037 return 0;
6038
6039 *flags = ntohl(nla_get_be32(attr));
6040 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6041 return -EOPNOTSUPP;
6042 if (!(set->flags & NFT_SET_INTERVAL) &&
6043 *flags & NFT_SET_ELEM_INTERVAL_END)
6044 return -EINVAL;
6045 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
6046 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6047 return -EINVAL;
6048
6049 return 0;
6050 }
6051
nft_setelem_parse_key(struct nft_ctx * ctx,struct nft_set * set,struct nft_data * key,struct nlattr * attr)6052 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
6053 struct nft_data *key, struct nlattr *attr)
6054 {
6055 struct nft_data_desc desc = {
6056 .type = NFT_DATA_VALUE,
6057 .size = NFT_DATA_VALUE_MAXLEN,
6058 .len = set->klen,
6059 };
6060
6061 return nft_data_init(ctx, key, &desc, attr);
6062 }
6063
nft_setelem_parse_data(struct nft_ctx * ctx,struct nft_set * set,struct nft_data_desc * desc,struct nft_data * data,struct nlattr * attr)6064 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
6065 struct nft_data_desc *desc,
6066 struct nft_data *data,
6067 struct nlattr *attr)
6068 {
6069 u32 dtype;
6070
6071 if (set->dtype == NFT_DATA_VERDICT)
6072 dtype = NFT_DATA_VERDICT;
6073 else
6074 dtype = NFT_DATA_VALUE;
6075
6076 desc->type = dtype;
6077 desc->size = NFT_DATA_VALUE_MAXLEN;
6078 desc->len = set->dlen;
6079 desc->flags = NFT_DATA_DESC_SETELEM;
6080
6081 return nft_data_init(ctx, data, desc, attr);
6082 }
6083
nft_setelem_catchall_get(const struct net * net,const struct nft_set * set)6084 static void *nft_setelem_catchall_get(const struct net *net,
6085 const struct nft_set *set)
6086 {
6087 struct nft_set_elem_catchall *catchall;
6088 u8 genmask = nft_genmask_cur(net);
6089 struct nft_set_ext *ext;
6090 void *priv = NULL;
6091
6092 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6093 ext = nft_set_elem_ext(set, catchall->elem);
6094 if (!nft_set_elem_active(ext, genmask) ||
6095 nft_set_elem_expired(ext))
6096 continue;
6097
6098 priv = catchall->elem;
6099 break;
6100 }
6101
6102 return priv;
6103 }
6104
nft_setelem_get(struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6105 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
6106 struct nft_set_elem *elem, u32 flags)
6107 {
6108 void *priv;
6109
6110 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6111 priv = set->ops->get(ctx->net, set, elem, flags);
6112 if (IS_ERR(priv))
6113 return PTR_ERR(priv);
6114 } else {
6115 priv = nft_setelem_catchall_get(ctx->net, set);
6116 if (!priv)
6117 return -ENOENT;
6118 }
6119 elem->priv = priv;
6120
6121 return 0;
6122 }
6123
nft_get_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,bool reset)6124 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6125 const struct nlattr *attr, bool reset)
6126 {
6127 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6128 struct nft_set_elem elem;
6129 struct sk_buff *skb;
6130 uint32_t flags = 0;
6131 int err;
6132
6133 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6134 nft_set_elem_policy, NULL);
6135 if (err < 0)
6136 return err;
6137
6138 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6139 if (err < 0)
6140 return err;
6141
6142 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6143 return -EINVAL;
6144
6145 if (nla[NFTA_SET_ELEM_KEY]) {
6146 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6147 nla[NFTA_SET_ELEM_KEY]);
6148 if (err < 0)
6149 return err;
6150 }
6151
6152 if (nla[NFTA_SET_ELEM_KEY_END]) {
6153 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6154 nla[NFTA_SET_ELEM_KEY_END]);
6155 if (err < 0)
6156 return err;
6157 }
6158
6159 err = nft_setelem_get(ctx, set, &elem, flags);
6160 if (err < 0)
6161 return err;
6162
6163 err = -ENOMEM;
6164 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6165 if (skb == NULL)
6166 return err;
6167
6168 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6169 NFT_MSG_NEWSETELEM, 0, set, &elem,
6170 reset);
6171 if (err < 0)
6172 goto err_fill_setelem;
6173
6174 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6175
6176 err_fill_setelem:
6177 kfree_skb(skb);
6178 return err;
6179 }
6180
6181 /* called with rcu_read_lock held */
nf_tables_getsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])6182 static int nf_tables_getsetelem(struct sk_buff *skb,
6183 const struct nfnl_info *info,
6184 const struct nlattr * const nla[])
6185 {
6186 struct netlink_ext_ack *extack = info->extack;
6187 u8 genmask = nft_genmask_cur(info->net);
6188 u8 family = info->nfmsg->nfgen_family;
6189 int rem, err = 0, nelems = 0;
6190 struct net *net = info->net;
6191 struct nft_table *table;
6192 struct nft_set *set;
6193 struct nlattr *attr;
6194 struct nft_ctx ctx;
6195 bool reset = false;
6196
6197 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6198 genmask, 0);
6199 if (IS_ERR(table)) {
6200 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6201 return PTR_ERR(table);
6202 }
6203
6204 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6205 if (IS_ERR(set))
6206 return PTR_ERR(set);
6207
6208 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6209
6210 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6211 struct netlink_dump_control c = {
6212 .start = nf_tables_dump_set_start,
6213 .dump = nf_tables_dump_set,
6214 .done = nf_tables_dump_set_done,
6215 .module = THIS_MODULE,
6216 };
6217 struct nft_set_dump_ctx dump_ctx = {
6218 .set = set,
6219 .ctx = ctx,
6220 };
6221
6222 c.data = &dump_ctx;
6223 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6224 }
6225
6226 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6227 return -EINVAL;
6228
6229 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6230 reset = true;
6231
6232 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6233 err = nft_get_set_elem(&ctx, set, attr, reset);
6234 if (err < 0) {
6235 NL_SET_BAD_ATTR(extack, attr);
6236 break;
6237 }
6238 nelems++;
6239 }
6240
6241 if (reset)
6242 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6243 nelems);
6244
6245 return err;
6246 }
6247
nf_tables_setelem_notify(const struct nft_ctx * ctx,const struct nft_set * set,const struct nft_set_elem * elem,int event)6248 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6249 const struct nft_set *set,
6250 const struct nft_set_elem *elem,
6251 int event)
6252 {
6253 struct nftables_pernet *nft_net;
6254 struct net *net = ctx->net;
6255 u32 portid = ctx->portid;
6256 struct sk_buff *skb;
6257 u16 flags = 0;
6258 int err;
6259
6260 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6261 return;
6262
6263 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6264 if (skb == NULL)
6265 goto err;
6266
6267 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6268 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6269
6270 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6271 set, elem, false);
6272 if (err < 0) {
6273 kfree_skb(skb);
6274 goto err;
6275 }
6276
6277 nft_net = nft_pernet(net);
6278 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6279 return;
6280 err:
6281 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6282 }
6283
nft_trans_elem_alloc(struct nft_ctx * ctx,int msg_type,struct nft_set * set)6284 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6285 int msg_type,
6286 struct nft_set *set)
6287 {
6288 struct nft_trans *trans;
6289
6290 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6291 if (trans == NULL)
6292 return NULL;
6293
6294 nft_trans_elem_set(trans) = set;
6295 return trans;
6296 }
6297
nft_set_elem_expr_alloc(const struct nft_ctx * ctx,const struct nft_set * set,const struct nlattr * attr)6298 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6299 const struct nft_set *set,
6300 const struct nlattr *attr)
6301 {
6302 struct nft_expr *expr;
6303 int err;
6304
6305 expr = nft_expr_init(ctx, attr);
6306 if (IS_ERR(expr))
6307 return expr;
6308
6309 err = -EOPNOTSUPP;
6310 if (expr->ops->type->flags & NFT_EXPR_GC) {
6311 if (set->flags & NFT_SET_TIMEOUT)
6312 goto err_set_elem_expr;
6313 if (!set->ops->gc_init)
6314 goto err_set_elem_expr;
6315 set->ops->gc_init(set);
6316 }
6317
6318 return expr;
6319
6320 err_set_elem_expr:
6321 nft_expr_destroy(ctx, expr);
6322 return ERR_PTR(err);
6323 }
6324
nft_set_ext_check(const struct nft_set_ext_tmpl * tmpl,u8 id,u32 len)6325 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6326 {
6327 len += nft_set_ext_types[id].len;
6328 if (len > tmpl->ext_len[id] ||
6329 len > U8_MAX)
6330 return -1;
6331
6332 return 0;
6333 }
6334
nft_set_ext_memcpy(const struct nft_set_ext_tmpl * tmpl,u8 id,void * to,const void * from,u32 len)6335 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6336 void *to, const void *from, u32 len)
6337 {
6338 if (nft_set_ext_check(tmpl, id, len) < 0)
6339 return -1;
6340
6341 memcpy(to, from, len);
6342
6343 return 0;
6344 }
6345
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)6346 void *nft_set_elem_init(const struct nft_set *set,
6347 const struct nft_set_ext_tmpl *tmpl,
6348 const u32 *key, const u32 *key_end,
6349 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6350 {
6351 struct nft_set_ext *ext;
6352 void *elem;
6353
6354 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6355 if (elem == NULL)
6356 return ERR_PTR(-ENOMEM);
6357
6358 ext = nft_set_elem_ext(set, elem);
6359 nft_set_ext_init(ext, tmpl);
6360
6361 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6362 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6363 nft_set_ext_key(ext), key, set->klen) < 0)
6364 goto err_ext_check;
6365
6366 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6367 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6368 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6369 goto err_ext_check;
6370
6371 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6372 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6373 nft_set_ext_data(ext), data, set->dlen) < 0)
6374 goto err_ext_check;
6375
6376 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6377 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6378 if (expiration == 0)
6379 *nft_set_ext_expiration(ext) += timeout;
6380 }
6381 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6382 *nft_set_ext_timeout(ext) = timeout;
6383
6384 return elem;
6385
6386 err_ext_check:
6387 kfree(elem);
6388
6389 return ERR_PTR(-EINVAL);
6390 }
6391
__nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_expr * expr)6392 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6393 struct nft_expr *expr)
6394 {
6395 if (expr->ops->destroy_clone) {
6396 expr->ops->destroy_clone(ctx, expr);
6397 module_put(expr->ops->type->owner);
6398 } else {
6399 nf_tables_expr_destroy(ctx, expr);
6400 }
6401 }
6402
nft_set_elem_expr_destroy(const struct nft_ctx * ctx,struct nft_set_elem_expr * elem_expr)6403 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6404 struct nft_set_elem_expr *elem_expr)
6405 {
6406 struct nft_expr *expr;
6407 u32 size;
6408
6409 nft_setelem_expr_foreach(expr, elem_expr, size)
6410 __nft_set_elem_expr_destroy(ctx, expr);
6411 }
6412
6413 /* 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)6414 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6415 bool destroy_expr)
6416 {
6417 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6418 struct nft_ctx ctx = {
6419 .net = read_pnet(&set->net),
6420 .family = set->table->family,
6421 };
6422
6423 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6424 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6425 nft_data_release(nft_set_ext_data(ext), set->dtype);
6426 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6427 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6428
6429 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6430 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6431 kfree(elem);
6432 }
6433 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6434
6435 /* Destroy element. References have been already dropped in the preparation
6436 * path via nft_setelem_data_deactivate().
6437 */
nf_tables_set_elem_destroy(const struct nft_ctx * ctx,const struct nft_set * set,void * elem)6438 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6439 const struct nft_set *set, void *elem)
6440 {
6441 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6442
6443 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6444 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6445
6446 kfree(elem);
6447 }
6448
nft_set_elem_expr_clone(const struct nft_ctx * ctx,struct nft_set * set,struct nft_expr * expr_array[])6449 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6450 struct nft_expr *expr_array[])
6451 {
6452 struct nft_expr *expr;
6453 int err, i, k;
6454
6455 for (i = 0; i < set->num_exprs; i++) {
6456 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6457 if (!expr)
6458 goto err_expr;
6459
6460 err = nft_expr_clone(expr, set->exprs[i], GFP_KERNEL_ACCOUNT);
6461 if (err < 0) {
6462 kfree(expr);
6463 goto err_expr;
6464 }
6465 expr_array[i] = expr;
6466 }
6467
6468 return 0;
6469
6470 err_expr:
6471 for (k = i - 1; k >= 0; k--)
6472 nft_expr_destroy(ctx, expr_array[k]);
6473
6474 return -ENOMEM;
6475 }
6476
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)6477 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6478 const struct nft_set_ext_tmpl *tmpl,
6479 const struct nft_set_ext *ext,
6480 struct nft_expr *expr_array[],
6481 u32 num_exprs)
6482 {
6483 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6484 u32 len = sizeof(struct nft_set_elem_expr);
6485 struct nft_expr *expr;
6486 int i, err;
6487
6488 if (num_exprs == 0)
6489 return 0;
6490
6491 for (i = 0; i < num_exprs; i++)
6492 len += expr_array[i]->ops->size;
6493
6494 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6495 return -EINVAL;
6496
6497 for (i = 0; i < num_exprs; i++) {
6498 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6499 err = nft_expr_clone(expr, expr_array[i], GFP_KERNEL_ACCOUNT);
6500 if (err < 0)
6501 goto err_elem_expr_setup;
6502
6503 elem_expr->size += expr_array[i]->ops->size;
6504 nft_expr_destroy(ctx, expr_array[i]);
6505 expr_array[i] = NULL;
6506 }
6507
6508 return 0;
6509
6510 err_elem_expr_setup:
6511 for (; i < num_exprs; i++) {
6512 nft_expr_destroy(ctx, expr_array[i]);
6513 expr_array[i] = NULL;
6514 }
6515
6516 return -ENOMEM;
6517 }
6518
nft_set_catchall_lookup(const struct net * net,const struct nft_set * set)6519 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6520 const struct nft_set *set)
6521 {
6522 struct nft_set_elem_catchall *catchall;
6523 u8 genmask = nft_genmask_cur(net);
6524 struct nft_set_ext *ext;
6525
6526 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6527 ext = nft_set_elem_ext(set, catchall->elem);
6528 if (nft_set_elem_active(ext, genmask) &&
6529 !nft_set_elem_expired(ext) &&
6530 !nft_set_elem_is_dead(ext))
6531 return ext;
6532 }
6533
6534 return NULL;
6535 }
6536 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6537
nft_setelem_catchall_insert(const struct net * net,struct nft_set * set,const struct nft_set_elem * elem,struct nft_set_ext ** pext)6538 static int nft_setelem_catchall_insert(const struct net *net,
6539 struct nft_set *set,
6540 const struct nft_set_elem *elem,
6541 struct nft_set_ext **pext)
6542 {
6543 struct nft_set_elem_catchall *catchall;
6544 u8 genmask = nft_genmask_next(net);
6545 struct nft_set_ext *ext;
6546
6547 list_for_each_entry(catchall, &set->catchall_list, list) {
6548 ext = nft_set_elem_ext(set, catchall->elem);
6549 if (nft_set_elem_active(ext, genmask)) {
6550 *pext = ext;
6551 return -EEXIST;
6552 }
6553 }
6554
6555 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6556 if (!catchall)
6557 return -ENOMEM;
6558
6559 catchall->elem = elem->priv;
6560 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6561
6562 return 0;
6563 }
6564
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)6565 static int nft_setelem_insert(const struct net *net,
6566 struct nft_set *set,
6567 const struct nft_set_elem *elem,
6568 struct nft_set_ext **ext, unsigned int flags)
6569 {
6570 int ret;
6571
6572 if (flags & NFT_SET_ELEM_CATCHALL)
6573 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6574 else
6575 ret = set->ops->insert(net, set, elem, ext);
6576
6577 return ret;
6578 }
6579
nft_setelem_is_catchall(const struct nft_set * set,const struct nft_set_elem * elem)6580 static bool nft_setelem_is_catchall(const struct nft_set *set,
6581 const struct nft_set_elem *elem)
6582 {
6583 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6584
6585 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6586 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6587 return true;
6588
6589 return false;
6590 }
6591
nft_setelem_activate(struct net * net,struct nft_set * set,struct nft_set_elem * elem)6592 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6593 struct nft_set_elem *elem)
6594 {
6595 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6596
6597 if (nft_setelem_is_catchall(set, elem)) {
6598 nft_clear(net, ext);
6599 } else {
6600 set->ops->activate(net, set, elem);
6601 }
6602 }
6603
nft_setelem_catchall_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6604 static int nft_setelem_catchall_deactivate(const struct net *net,
6605 struct nft_set *set,
6606 struct nft_set_elem *elem)
6607 {
6608 struct nft_set_elem_catchall *catchall;
6609 struct nft_set_ext *ext;
6610
6611 list_for_each_entry(catchall, &set->catchall_list, list) {
6612 ext = nft_set_elem_ext(set, catchall->elem);
6613 if (!nft_is_active_next(net, ext))
6614 continue;
6615
6616 kfree(elem->priv);
6617 elem->priv = catchall->elem;
6618 nft_set_elem_change_active(net, set, ext);
6619 return 0;
6620 }
6621
6622 return -ENOENT;
6623 }
6624
__nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem)6625 static int __nft_setelem_deactivate(const struct net *net,
6626 struct nft_set *set,
6627 struct nft_set_elem *elem)
6628 {
6629 void *priv;
6630
6631 priv = set->ops->deactivate(net, set, elem);
6632 if (!priv)
6633 return -ENOENT;
6634
6635 kfree(elem->priv);
6636 elem->priv = priv;
6637 set->ndeact++;
6638
6639 return 0;
6640 }
6641
nft_setelem_deactivate(const struct net * net,struct nft_set * set,struct nft_set_elem * elem,u32 flags)6642 static int nft_setelem_deactivate(const struct net *net,
6643 struct nft_set *set,
6644 struct nft_set_elem *elem, u32 flags)
6645 {
6646 int ret;
6647
6648 if (flags & NFT_SET_ELEM_CATCHALL)
6649 ret = nft_setelem_catchall_deactivate(net, set, elem);
6650 else
6651 ret = __nft_setelem_deactivate(net, set, elem);
6652
6653 return ret;
6654 }
6655
nft_setelem_catchall_destroy(struct nft_set_elem_catchall * catchall)6656 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6657 {
6658 list_del_rcu(&catchall->list);
6659 kfree_rcu(catchall, rcu);
6660 }
6661
nft_setelem_catchall_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6662 static void nft_setelem_catchall_remove(const struct net *net,
6663 const struct nft_set *set,
6664 const struct nft_set_elem *elem)
6665 {
6666 struct nft_set_elem_catchall *catchall, *next;
6667
6668 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6669 if (catchall->elem == elem->priv) {
6670 nft_setelem_catchall_destroy(catchall);
6671 break;
6672 }
6673 }
6674 }
6675
nft_setelem_remove(const struct net * net,const struct nft_set * set,const struct nft_set_elem * elem)6676 static void nft_setelem_remove(const struct net *net,
6677 const struct nft_set *set,
6678 const struct nft_set_elem *elem)
6679 {
6680 if (nft_setelem_is_catchall(set, elem))
6681 nft_setelem_catchall_remove(net, set, elem);
6682 else
6683 set->ops->remove(net, set, elem);
6684 }
6685
nft_setelem_valid_key_end(const struct nft_set * set,struct nlattr ** nla,u32 flags)6686 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6687 struct nlattr **nla, u32 flags)
6688 {
6689 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6690 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6691 if (flags & NFT_SET_ELEM_INTERVAL_END)
6692 return false;
6693
6694 if (nla[NFTA_SET_ELEM_KEY_END] &&
6695 flags & NFT_SET_ELEM_CATCHALL)
6696 return false;
6697 } else {
6698 if (nla[NFTA_SET_ELEM_KEY_END])
6699 return false;
6700 }
6701
6702 return true;
6703 }
6704
nft_set_maxsize(const struct nft_set * set)6705 static u32 nft_set_maxsize(const struct nft_set *set)
6706 {
6707 u32 maxsize, delta;
6708
6709 if (!set->size)
6710 return UINT_MAX;
6711
6712 if (set->ops->adjust_maxsize)
6713 delta = set->ops->adjust_maxsize(set);
6714 else
6715 delta = 0;
6716
6717 if (check_add_overflow(set->size, set->ndeact, &maxsize))
6718 return UINT_MAX;
6719
6720 if (check_add_overflow(maxsize, delta, &maxsize))
6721 return UINT_MAX;
6722
6723 return maxsize;
6724 }
6725
nft_add_set_elem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr,u32 nlmsg_flags)6726 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6727 const struct nlattr *attr, u32 nlmsg_flags)
6728 {
6729 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6730 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6731 u8 genmask = nft_genmask_next(ctx->net);
6732 u32 flags = 0, size = 0, num_exprs = 0;
6733 struct nft_set_ext_tmpl tmpl;
6734 struct nft_set_ext *ext, *ext2;
6735 struct nft_set_elem elem;
6736 struct nft_set_binding *binding;
6737 struct nft_object *obj = NULL;
6738 struct nft_userdata *udata;
6739 struct nft_data_desc desc;
6740 enum nft_registers dreg;
6741 struct nft_trans *trans;
6742 u64 timeout;
6743 u64 expiration;
6744 int err, i;
6745 u8 ulen;
6746
6747 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6748 nft_set_elem_policy, NULL);
6749 if (err < 0)
6750 return err;
6751
6752 nft_set_ext_prepare(&tmpl);
6753
6754 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6755 if (err < 0)
6756 return err;
6757
6758 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6759 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6760 return -EINVAL;
6761
6762 if (flags != 0) {
6763 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6764 if (err < 0)
6765 return err;
6766 }
6767
6768 if (set->flags & NFT_SET_MAP) {
6769 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6770 !(flags & NFT_SET_ELEM_INTERVAL_END))
6771 return -EINVAL;
6772 } else {
6773 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6774 return -EINVAL;
6775 }
6776
6777 if (set->flags & NFT_SET_OBJECT) {
6778 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6779 !(flags & NFT_SET_ELEM_INTERVAL_END))
6780 return -EINVAL;
6781 } else {
6782 if (nla[NFTA_SET_ELEM_OBJREF])
6783 return -EINVAL;
6784 }
6785
6786 if (!nft_setelem_valid_key_end(set, nla, flags))
6787 return -EINVAL;
6788
6789 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6790 (nla[NFTA_SET_ELEM_DATA] ||
6791 nla[NFTA_SET_ELEM_OBJREF] ||
6792 nla[NFTA_SET_ELEM_TIMEOUT] ||
6793 nla[NFTA_SET_ELEM_EXPIRATION] ||
6794 nla[NFTA_SET_ELEM_USERDATA] ||
6795 nla[NFTA_SET_ELEM_EXPR] ||
6796 nla[NFTA_SET_ELEM_KEY_END] ||
6797 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6798 return -EINVAL;
6799
6800 timeout = 0;
6801 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6802 if (!(set->flags & NFT_SET_TIMEOUT))
6803 return -EINVAL;
6804 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6805 &timeout);
6806 if (err)
6807 return err;
6808 } else if (set->flags & NFT_SET_TIMEOUT &&
6809 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6810 timeout = set->timeout;
6811 }
6812
6813 expiration = 0;
6814 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6815 if (!(set->flags & NFT_SET_TIMEOUT))
6816 return -EINVAL;
6817 if (timeout == 0)
6818 return -EOPNOTSUPP;
6819
6820 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6821 &expiration);
6822 if (err)
6823 return err;
6824
6825 if (expiration > timeout)
6826 return -ERANGE;
6827 }
6828
6829 if (nla[NFTA_SET_ELEM_EXPR]) {
6830 struct nft_expr *expr;
6831
6832 if (set->num_exprs && set->num_exprs != 1)
6833 return -EOPNOTSUPP;
6834
6835 expr = nft_set_elem_expr_alloc(ctx, set,
6836 nla[NFTA_SET_ELEM_EXPR]);
6837 if (IS_ERR(expr))
6838 return PTR_ERR(expr);
6839
6840 expr_array[0] = expr;
6841 num_exprs = 1;
6842
6843 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6844 err = -EOPNOTSUPP;
6845 goto err_set_elem_expr;
6846 }
6847 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6848 struct nft_expr *expr;
6849 struct nlattr *tmp;
6850 int left;
6851
6852 i = 0;
6853 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6854 if (i == NFT_SET_EXPR_MAX ||
6855 (set->num_exprs && set->num_exprs == i)) {
6856 err = -E2BIG;
6857 goto err_set_elem_expr;
6858 }
6859 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6860 err = -EINVAL;
6861 goto err_set_elem_expr;
6862 }
6863 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6864 if (IS_ERR(expr)) {
6865 err = PTR_ERR(expr);
6866 goto err_set_elem_expr;
6867 }
6868 expr_array[i] = expr;
6869 num_exprs++;
6870
6871 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6872 err = -EOPNOTSUPP;
6873 goto err_set_elem_expr;
6874 }
6875 i++;
6876 }
6877 if (set->num_exprs && set->num_exprs != i) {
6878 err = -EOPNOTSUPP;
6879 goto err_set_elem_expr;
6880 }
6881 } else if (set->num_exprs > 0 &&
6882 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6883 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6884 if (err < 0)
6885 goto err_set_elem_expr_clone;
6886
6887 num_exprs = set->num_exprs;
6888 }
6889
6890 if (nla[NFTA_SET_ELEM_KEY]) {
6891 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6892 nla[NFTA_SET_ELEM_KEY]);
6893 if (err < 0)
6894 goto err_set_elem_expr;
6895
6896 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6897 if (err < 0)
6898 goto err_parse_key;
6899 }
6900
6901 if (nla[NFTA_SET_ELEM_KEY_END]) {
6902 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6903 nla[NFTA_SET_ELEM_KEY_END]);
6904 if (err < 0)
6905 goto err_parse_key;
6906
6907 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6908 if (err < 0)
6909 goto err_parse_key_end;
6910 }
6911
6912 if (timeout > 0) {
6913 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6914 if (err < 0)
6915 goto err_parse_key_end;
6916
6917 if (timeout != set->timeout) {
6918 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6919 if (err < 0)
6920 goto err_parse_key_end;
6921 }
6922 }
6923
6924 if (num_exprs) {
6925 for (i = 0; i < num_exprs; i++)
6926 size += expr_array[i]->ops->size;
6927
6928 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6929 sizeof(struct nft_set_elem_expr) + size);
6930 if (err < 0)
6931 goto err_parse_key_end;
6932 }
6933
6934 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6935 obj = nft_obj_lookup(ctx->net, ctx->table,
6936 nla[NFTA_SET_ELEM_OBJREF],
6937 set->objtype, genmask);
6938 if (IS_ERR(obj)) {
6939 err = PTR_ERR(obj);
6940 obj = NULL;
6941 goto err_parse_key_end;
6942 }
6943
6944 if (!nft_use_inc(&obj->use)) {
6945 err = -EMFILE;
6946 obj = NULL;
6947 goto err_parse_key_end;
6948 }
6949
6950 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6951 if (err < 0)
6952 goto err_parse_key_end;
6953 }
6954
6955 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6956 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6957 nla[NFTA_SET_ELEM_DATA]);
6958 if (err < 0)
6959 goto err_parse_key_end;
6960
6961 dreg = nft_type_to_reg(set->dtype);
6962 list_for_each_entry(binding, &set->bindings, list) {
6963 struct nft_ctx bind_ctx = {
6964 .net = ctx->net,
6965 .family = ctx->family,
6966 .table = ctx->table,
6967 .chain = (struct nft_chain *)binding->chain,
6968 };
6969
6970 if (!(binding->flags & NFT_SET_MAP))
6971 continue;
6972
6973 err = nft_validate_register_store(&bind_ctx, dreg,
6974 &elem.data.val,
6975 desc.type, desc.len);
6976 if (err < 0)
6977 goto err_parse_data;
6978
6979 if (desc.type == NFT_DATA_VERDICT &&
6980 (elem.data.val.verdict.code == NFT_GOTO ||
6981 elem.data.val.verdict.code == NFT_JUMP))
6982 nft_validate_state_update(ctx->table,
6983 NFT_VALIDATE_NEED);
6984 }
6985
6986 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6987 if (err < 0)
6988 goto err_parse_data;
6989 }
6990
6991 /* The full maximum length of userdata can exceed the maximum
6992 * offset value (U8_MAX) for following extensions, therefor it
6993 * must be the last extension added.
6994 */
6995 ulen = 0;
6996 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6997 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6998 if (ulen > 0) {
6999 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
7000 ulen);
7001 if (err < 0)
7002 goto err_parse_data;
7003 }
7004 }
7005
7006 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7007 elem.key_end.val.data, elem.data.val.data,
7008 timeout, expiration, GFP_KERNEL_ACCOUNT);
7009 if (IS_ERR(elem.priv)) {
7010 err = PTR_ERR(elem.priv);
7011 goto err_parse_data;
7012 }
7013
7014 ext = nft_set_elem_ext(set, elem.priv);
7015 if (flags)
7016 *nft_set_ext_flags(ext) = flags;
7017
7018 if (obj)
7019 *nft_set_ext_obj(ext) = obj;
7020
7021 if (ulen > 0) {
7022 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
7023 err = -EINVAL;
7024 goto err_elem_free;
7025 }
7026 udata = nft_set_ext_userdata(ext);
7027 udata->len = ulen - 1;
7028 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7029 }
7030 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7031 if (err < 0)
7032 goto err_elem_free;
7033
7034 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7035 if (trans == NULL) {
7036 err = -ENOMEM;
7037 goto err_elem_free;
7038 }
7039
7040 ext->genmask = nft_genmask_cur(ctx->net);
7041
7042 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
7043 if (err) {
7044 if (err == -EEXIST) {
7045 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7046 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7047 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7048 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7049 goto err_element_clash;
7050 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7051 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7052 memcmp(nft_set_ext_data(ext),
7053 nft_set_ext_data(ext2), set->dlen) != 0) ||
7054 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7055 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7056 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7057 goto err_element_clash;
7058 else if (!(nlmsg_flags & NLM_F_EXCL))
7059 err = 0;
7060 } else if (err == -ENOTEMPTY) {
7061 /* ENOTEMPTY reports overlapping between this element
7062 * and an existing one.
7063 */
7064 err = -EEXIST;
7065 }
7066 goto err_element_clash;
7067 }
7068
7069 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7070 unsigned int max = nft_set_maxsize(set);
7071
7072 if (!atomic_add_unless(&set->nelems, 1, max)) {
7073 err = -ENFILE;
7074 goto err_set_full;
7075 }
7076 }
7077
7078 nft_trans_elem(trans) = elem;
7079 nft_trans_commit_list_add_tail(ctx->net, trans);
7080 return 0;
7081
7082 err_set_full:
7083 nft_setelem_remove(ctx->net, set, &elem);
7084 err_element_clash:
7085 kfree(trans);
7086 err_elem_free:
7087 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7088 err_parse_data:
7089 if (nla[NFTA_SET_ELEM_DATA] != NULL)
7090 nft_data_release(&elem.data.val, desc.type);
7091 err_parse_key_end:
7092 if (obj)
7093 nft_use_dec_restore(&obj->use);
7094
7095 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7096 err_parse_key:
7097 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7098 err_set_elem_expr:
7099 for (i = 0; i < num_exprs && expr_array[i]; i++)
7100 nft_expr_destroy(ctx, expr_array[i]);
7101 err_set_elem_expr_clone:
7102 return err;
7103 }
7104
nf_tables_newsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7105 static int nf_tables_newsetelem(struct sk_buff *skb,
7106 const struct nfnl_info *info,
7107 const struct nlattr * const nla[])
7108 {
7109 struct netlink_ext_ack *extack = info->extack;
7110 u8 genmask = nft_genmask_next(info->net);
7111 u8 family = info->nfmsg->nfgen_family;
7112 struct net *net = info->net;
7113 const struct nlattr *attr;
7114 struct nft_table *table;
7115 struct nft_set *set;
7116 struct nft_ctx ctx;
7117 int rem, err;
7118
7119 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7120 return -EINVAL;
7121
7122 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7123 genmask, NETLINK_CB(skb).portid);
7124 if (IS_ERR(table)) {
7125 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7126 return PTR_ERR(table);
7127 }
7128
7129 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7130 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7131 if (IS_ERR(set))
7132 return PTR_ERR(set);
7133
7134 if (!list_empty(&set->bindings) &&
7135 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7136 return -EBUSY;
7137
7138 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7139
7140 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7141 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7142 if (err < 0) {
7143 NL_SET_BAD_ATTR(extack, attr);
7144 return err;
7145 }
7146 }
7147
7148 if (table->validate_state == NFT_VALIDATE_DO)
7149 return nft_table_validate(net, table);
7150
7151 return 0;
7152 }
7153
7154 /**
7155 * nft_data_hold - hold a nft_data item
7156 *
7157 * @data: struct nft_data to release
7158 * @type: type of data
7159 *
7160 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7161 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7162 * NFT_GOTO verdicts. This function must be called on active data objects
7163 * from the second phase of the commit protocol.
7164 */
nft_data_hold(const struct nft_data * data,enum nft_data_types type)7165 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7166 {
7167 struct nft_chain *chain;
7168
7169 if (type == NFT_DATA_VERDICT) {
7170 switch (data->verdict.code) {
7171 case NFT_JUMP:
7172 case NFT_GOTO:
7173 chain = data->verdict.chain;
7174 nft_use_inc_restore(&chain->use);
7175 break;
7176 }
7177 }
7178 }
7179
nft_setelem_active_next(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7180 static int nft_setelem_active_next(const struct net *net,
7181 const struct nft_set *set,
7182 struct nft_set_elem *elem)
7183 {
7184 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7185 u8 genmask = nft_genmask_next(net);
7186
7187 return nft_set_elem_active(ext, genmask);
7188 }
7189
nft_setelem_data_activate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7190 static void nft_setelem_data_activate(const struct net *net,
7191 const struct nft_set *set,
7192 struct nft_set_elem *elem)
7193 {
7194 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7195
7196 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7197 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7198 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7199 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7200 }
7201
nft_setelem_data_deactivate(const struct net * net,const struct nft_set * set,struct nft_set_elem * elem)7202 void nft_setelem_data_deactivate(const struct net *net,
7203 const struct nft_set *set,
7204 struct nft_set_elem *elem)
7205 {
7206 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7207
7208 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7209 nft_data_release(nft_set_ext_data(ext), set->dtype);
7210 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7211 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7212 }
7213
nft_del_setelem(struct nft_ctx * ctx,struct nft_set * set,const struct nlattr * attr)7214 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7215 const struct nlattr *attr)
7216 {
7217 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7218 struct nft_set_ext_tmpl tmpl;
7219 struct nft_set_elem elem;
7220 struct nft_set_ext *ext;
7221 struct nft_trans *trans;
7222 u32 flags = 0;
7223 int err;
7224
7225 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7226 nft_set_elem_policy, NULL);
7227 if (err < 0)
7228 return err;
7229
7230 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7231 if (err < 0)
7232 return err;
7233
7234 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7235 return -EINVAL;
7236
7237 if (!nft_setelem_valid_key_end(set, nla, flags))
7238 return -EINVAL;
7239
7240 nft_set_ext_prepare(&tmpl);
7241
7242 if (flags != 0) {
7243 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7244 if (err < 0)
7245 return err;
7246 }
7247
7248 if (nla[NFTA_SET_ELEM_KEY]) {
7249 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7250 nla[NFTA_SET_ELEM_KEY]);
7251 if (err < 0)
7252 return err;
7253
7254 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7255 if (err < 0)
7256 goto fail_elem;
7257 }
7258
7259 if (nla[NFTA_SET_ELEM_KEY_END]) {
7260 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7261 nla[NFTA_SET_ELEM_KEY_END]);
7262 if (err < 0)
7263 goto fail_elem;
7264
7265 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7266 if (err < 0)
7267 goto fail_elem_key_end;
7268 }
7269
7270 err = -ENOMEM;
7271 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7272 elem.key_end.val.data, NULL, 0, 0,
7273 GFP_KERNEL_ACCOUNT);
7274 if (IS_ERR(elem.priv)) {
7275 err = PTR_ERR(elem.priv);
7276 goto fail_elem_key_end;
7277 }
7278
7279 ext = nft_set_elem_ext(set, elem.priv);
7280 if (flags)
7281 *nft_set_ext_flags(ext) = flags;
7282
7283 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7284 if (trans == NULL)
7285 goto fail_trans;
7286
7287 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7288 if (err < 0)
7289 goto fail_ops;
7290
7291 nft_setelem_data_deactivate(ctx->net, set, &elem);
7292
7293 nft_trans_elem(trans) = elem;
7294 nft_trans_commit_list_add_tail(ctx->net, trans);
7295 return 0;
7296
7297 fail_ops:
7298 kfree(trans);
7299 fail_trans:
7300 kfree(elem.priv);
7301 fail_elem_key_end:
7302 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7303 fail_elem:
7304 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7305 return err;
7306 }
7307
nft_setelem_flush(const struct nft_ctx * ctx,struct nft_set * set,const struct nft_set_iter * iter,struct nft_set_elem * elem)7308 static int nft_setelem_flush(const struct nft_ctx *ctx,
7309 struct nft_set *set,
7310 const struct nft_set_iter *iter,
7311 struct nft_set_elem *elem)
7312 {
7313 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7314 struct nft_trans *trans;
7315 int err;
7316
7317 if (!nft_set_elem_active(ext, iter->genmask))
7318 return 0;
7319
7320 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7321 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7322 if (!trans)
7323 return -ENOMEM;
7324
7325 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7326 err = -ENOENT;
7327 goto err1;
7328 }
7329 set->ndeact++;
7330
7331 nft_setelem_data_deactivate(ctx->net, set, elem);
7332 nft_trans_elem_set(trans) = set;
7333 nft_trans_elem(trans) = *elem;
7334 nft_trans_commit_list_add_tail(ctx->net, trans);
7335
7336 return 0;
7337 err1:
7338 kfree(trans);
7339 return err;
7340 }
7341
__nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set,struct nft_set_elem * elem)7342 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7343 struct nft_set *set,
7344 struct nft_set_elem *elem)
7345 {
7346 struct nft_trans *trans;
7347
7348 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7349 sizeof(struct nft_trans_elem), GFP_KERNEL);
7350 if (!trans)
7351 return -ENOMEM;
7352
7353 nft_setelem_data_deactivate(ctx->net, set, elem);
7354 nft_trans_elem_set(trans) = set;
7355 nft_trans_elem(trans) = *elem;
7356 nft_trans_commit_list_add_tail(ctx->net, trans);
7357
7358 return 0;
7359 }
7360
nft_set_catchall_flush(const struct nft_ctx * ctx,struct nft_set * set)7361 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7362 struct nft_set *set)
7363 {
7364 u8 genmask = nft_genmask_next(ctx->net);
7365 struct nft_set_elem_catchall *catchall;
7366 struct nft_set_elem elem;
7367 struct nft_set_ext *ext;
7368 int ret = 0;
7369
7370 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7371 ext = nft_set_elem_ext(set, catchall->elem);
7372 if (!nft_set_elem_active(ext, genmask))
7373 continue;
7374
7375 elem.priv = catchall->elem;
7376 ret = __nft_set_catchall_flush(ctx, set, &elem);
7377 if (ret < 0)
7378 break;
7379 nft_set_elem_change_active(ctx->net, set, ext);
7380 }
7381
7382 return ret;
7383 }
7384
nft_set_flush(struct nft_ctx * ctx,struct nft_set * set,u8 genmask)7385 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7386 {
7387 struct nft_set_iter iter = {
7388 .genmask = genmask,
7389 .type = NFT_ITER_UPDATE,
7390 .fn = nft_setelem_flush,
7391 };
7392
7393 set->ops->walk(ctx, set, &iter);
7394 if (!iter.err)
7395 iter.err = nft_set_catchall_flush(ctx, set);
7396
7397 return iter.err;
7398 }
7399
nf_tables_delsetelem(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7400 static int nf_tables_delsetelem(struct sk_buff *skb,
7401 const struct nfnl_info *info,
7402 const struct nlattr * const nla[])
7403 {
7404 struct netlink_ext_ack *extack = info->extack;
7405 u8 genmask = nft_genmask_next(info->net);
7406 u8 family = info->nfmsg->nfgen_family;
7407 struct net *net = info->net;
7408 const struct nlattr *attr;
7409 struct nft_table *table;
7410 struct nft_set *set;
7411 struct nft_ctx ctx;
7412 int rem, err = 0;
7413
7414 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7415 genmask, NETLINK_CB(skb).portid);
7416 if (IS_ERR(table)) {
7417 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7418 return PTR_ERR(table);
7419 }
7420
7421 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7422 if (IS_ERR(set))
7423 return PTR_ERR(set);
7424
7425 if (nft_set_is_anonymous(set))
7426 return -EOPNOTSUPP;
7427
7428 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7429 return -EBUSY;
7430
7431 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7432
7433 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7434 return nft_set_flush(&ctx, set, genmask);
7435
7436 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7437 err = nft_del_setelem(&ctx, set, attr);
7438 if (err == -ENOENT &&
7439 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7440 continue;
7441
7442 if (err < 0) {
7443 NL_SET_BAD_ATTR(extack, attr);
7444 return err;
7445 }
7446 }
7447
7448 return 0;
7449 }
7450
7451 /*
7452 * Stateful objects
7453 */
7454
7455 /**
7456 * nft_register_obj- register nf_tables stateful object type
7457 * @obj_type: object type
7458 *
7459 * Registers the object type for use with nf_tables. Returns zero on
7460 * success or a negative errno code otherwise.
7461 */
nft_register_obj(struct nft_object_type * obj_type)7462 int nft_register_obj(struct nft_object_type *obj_type)
7463 {
7464 if (obj_type->type == NFT_OBJECT_UNSPEC)
7465 return -EINVAL;
7466
7467 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7468 list_add_rcu(&obj_type->list, &nf_tables_objects);
7469 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7470 return 0;
7471 }
7472 EXPORT_SYMBOL_GPL(nft_register_obj);
7473
7474 /**
7475 * nft_unregister_obj - unregister nf_tables object type
7476 * @obj_type: object type
7477 *
7478 * Unregisters the object type for use with nf_tables.
7479 */
nft_unregister_obj(struct nft_object_type * obj_type)7480 void nft_unregister_obj(struct nft_object_type *obj_type)
7481 {
7482 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7483 list_del_rcu(&obj_type->list);
7484 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7485 }
7486 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7487
nft_obj_lookup(const struct net * net,const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7488 struct nft_object *nft_obj_lookup(const struct net *net,
7489 const struct nft_table *table,
7490 const struct nlattr *nla, u32 objtype,
7491 u8 genmask)
7492 {
7493 struct nft_object_hash_key k = { .table = table };
7494 char search[NFT_OBJ_MAXNAMELEN];
7495 struct rhlist_head *tmp, *list;
7496 struct nft_object *obj;
7497
7498 nla_strscpy(search, nla, sizeof(search));
7499 k.name = search;
7500
7501 WARN_ON_ONCE(!rcu_read_lock_held() &&
7502 !lockdep_commit_lock_is_held(net));
7503
7504 rcu_read_lock();
7505 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7506 if (!list)
7507 goto out;
7508
7509 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7510 if (objtype == obj->ops->type->type &&
7511 nft_active_genmask(obj, genmask)) {
7512 rcu_read_unlock();
7513 return obj;
7514 }
7515 }
7516 out:
7517 rcu_read_unlock();
7518 return ERR_PTR(-ENOENT);
7519 }
7520 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7521
nft_obj_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u32 objtype,u8 genmask)7522 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7523 const struct nlattr *nla,
7524 u32 objtype, u8 genmask)
7525 {
7526 struct nft_object *obj;
7527
7528 list_for_each_entry(obj, &table->objects, list) {
7529 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7530 objtype == obj->ops->type->type &&
7531 nft_active_genmask(obj, genmask))
7532 return obj;
7533 }
7534 return ERR_PTR(-ENOENT);
7535 }
7536
7537 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7538 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7539 .len = NFT_TABLE_MAXNAMELEN - 1 },
7540 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7541 .len = NFT_OBJ_MAXNAMELEN - 1 },
7542 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7543 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7544 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7545 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7546 .len = NFT_USERDATA_MAXLEN },
7547 };
7548
nft_obj_init(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr)7549 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7550 const struct nft_object_type *type,
7551 const struct nlattr *attr)
7552 {
7553 struct nlattr **tb;
7554 const struct nft_object_ops *ops;
7555 struct nft_object *obj;
7556 int err = -ENOMEM;
7557
7558 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7559 if (!tb)
7560 goto err1;
7561
7562 if (attr) {
7563 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7564 type->policy, NULL);
7565 if (err < 0)
7566 goto err2;
7567 } else {
7568 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7569 }
7570
7571 if (type->select_ops) {
7572 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7573 if (IS_ERR(ops)) {
7574 err = PTR_ERR(ops);
7575 goto err2;
7576 }
7577 } else {
7578 ops = type->ops;
7579 }
7580
7581 err = -ENOMEM;
7582 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7583 if (!obj)
7584 goto err2;
7585
7586 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7587 if (err < 0)
7588 goto err3;
7589
7590 obj->ops = ops;
7591
7592 kfree(tb);
7593 return obj;
7594 err3:
7595 kfree(obj);
7596 err2:
7597 kfree(tb);
7598 err1:
7599 return ERR_PTR(err);
7600 }
7601
nft_object_dump(struct sk_buff * skb,unsigned int attr,struct nft_object * obj,bool reset)7602 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7603 struct nft_object *obj, bool reset)
7604 {
7605 struct nlattr *nest;
7606
7607 nest = nla_nest_start_noflag(skb, attr);
7608 if (!nest)
7609 goto nla_put_failure;
7610 if (obj->ops->dump(skb, obj, reset) < 0)
7611 goto nla_put_failure;
7612 nla_nest_end(skb, nest);
7613 return 0;
7614
7615 nla_put_failure:
7616 return -1;
7617 }
7618
__nft_obj_type_get(u32 objtype,u8 family)7619 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7620 {
7621 const struct nft_object_type *type;
7622
7623 list_for_each_entry_rcu(type, &nf_tables_objects, list) {
7624 if (type->family != NFPROTO_UNSPEC &&
7625 type->family != family)
7626 continue;
7627
7628 if (objtype == type->type)
7629 return type;
7630 }
7631 return NULL;
7632 }
7633
7634 static const struct nft_object_type *
nft_obj_type_get(struct net * net,u32 objtype,u8 family)7635 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7636 {
7637 const struct nft_object_type *type;
7638
7639 rcu_read_lock();
7640 type = __nft_obj_type_get(objtype, family);
7641 if (type != NULL && try_module_get(type->owner)) {
7642 rcu_read_unlock();
7643 return type;
7644 }
7645 rcu_read_unlock();
7646
7647 lockdep_nfnl_nft_mutex_not_held();
7648 #ifdef CONFIG_MODULES
7649 if (type == NULL) {
7650 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7651 return ERR_PTR(-EAGAIN);
7652 }
7653 #endif
7654 return ERR_PTR(-ENOENT);
7655 }
7656
nf_tables_updobj(const struct nft_ctx * ctx,const struct nft_object_type * type,const struct nlattr * attr,struct nft_object * obj)7657 static int nf_tables_updobj(const struct nft_ctx *ctx,
7658 const struct nft_object_type *type,
7659 const struct nlattr *attr,
7660 struct nft_object *obj)
7661 {
7662 struct nft_object *newobj;
7663 struct nft_trans *trans;
7664 int err = -ENOMEM;
7665
7666 /* caller must have obtained type->owner reference. */
7667 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7668 sizeof(struct nft_trans_obj));
7669 if (!trans)
7670 goto err_trans;
7671
7672 newobj = nft_obj_init(ctx, type, attr);
7673 if (IS_ERR(newobj)) {
7674 err = PTR_ERR(newobj);
7675 goto err_free_trans;
7676 }
7677
7678 nft_trans_obj(trans) = obj;
7679 nft_trans_obj_update(trans) = true;
7680 nft_trans_obj_newobj(trans) = newobj;
7681 nft_trans_commit_list_add_tail(ctx->net, trans);
7682
7683 return 0;
7684
7685 err_free_trans:
7686 kfree(trans);
7687 err_trans:
7688 module_put(type->owner);
7689 return err;
7690 }
7691
nf_tables_newobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])7692 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7693 const struct nlattr * const nla[])
7694 {
7695 struct netlink_ext_ack *extack = info->extack;
7696 u8 genmask = nft_genmask_next(info->net);
7697 u8 family = info->nfmsg->nfgen_family;
7698 const struct nft_object_type *type;
7699 struct net *net = info->net;
7700 struct nft_table *table;
7701 struct nft_object *obj;
7702 struct nft_ctx ctx;
7703 u32 objtype;
7704 int err;
7705
7706 if (!nla[NFTA_OBJ_TYPE] ||
7707 !nla[NFTA_OBJ_NAME] ||
7708 !nla[NFTA_OBJ_DATA])
7709 return -EINVAL;
7710
7711 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7712 NETLINK_CB(skb).portid);
7713 if (IS_ERR(table)) {
7714 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7715 return PTR_ERR(table);
7716 }
7717
7718 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7719 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7720 if (IS_ERR(obj)) {
7721 err = PTR_ERR(obj);
7722 if (err != -ENOENT) {
7723 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7724 return err;
7725 }
7726 } else {
7727 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7728 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7729 return -EEXIST;
7730 }
7731 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7732 return -EOPNOTSUPP;
7733
7734 if (!obj->ops->update)
7735 return 0;
7736
7737 type = nft_obj_type_get(net, objtype, family);
7738 if (WARN_ON_ONCE(IS_ERR(type)))
7739 return PTR_ERR(type);
7740
7741 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7742
7743 /* type->owner reference is put when transaction object is released. */
7744 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7745 }
7746
7747 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7748
7749 if (!nft_use_inc(&table->use))
7750 return -EMFILE;
7751
7752 type = nft_obj_type_get(net, objtype, family);
7753 if (IS_ERR(type)) {
7754 err = PTR_ERR(type);
7755 goto err_type;
7756 }
7757
7758 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7759 if (IS_ERR(obj)) {
7760 err = PTR_ERR(obj);
7761 goto err_init;
7762 }
7763 obj->key.table = table;
7764 obj->handle = nf_tables_alloc_handle(table);
7765
7766 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7767 if (!obj->key.name) {
7768 err = -ENOMEM;
7769 goto err_strdup;
7770 }
7771
7772 if (nla[NFTA_OBJ_USERDATA]) {
7773 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7774 if (obj->udata == NULL)
7775 goto err_userdata;
7776
7777 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7778 }
7779
7780 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7781 if (err < 0)
7782 goto err_trans;
7783
7784 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7785 nft_objname_ht_params);
7786 if (err < 0)
7787 goto err_obj_ht;
7788
7789 list_add_tail_rcu(&obj->list, &table->objects);
7790
7791 return 0;
7792 err_obj_ht:
7793 /* queued in transaction log */
7794 INIT_LIST_HEAD(&obj->list);
7795 return err;
7796 err_trans:
7797 kfree(obj->udata);
7798 err_userdata:
7799 kfree(obj->key.name);
7800 err_strdup:
7801 if (obj->ops->destroy)
7802 obj->ops->destroy(&ctx, obj);
7803 kfree(obj);
7804 err_init:
7805 module_put(type->owner);
7806 err_type:
7807 nft_use_dec_restore(&table->use);
7808
7809 return err;
7810 }
7811
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)7812 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7813 u32 portid, u32 seq, int event, u32 flags,
7814 int family, const struct nft_table *table,
7815 struct nft_object *obj, bool reset)
7816 {
7817 struct nlmsghdr *nlh;
7818
7819 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7820 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7821 NFNETLINK_V0, nft_base_seq(net));
7822 if (!nlh)
7823 goto nla_put_failure;
7824
7825 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7826 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7827 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7828 NFTA_OBJ_PAD))
7829 goto nla_put_failure;
7830
7831 if (event == NFT_MSG_DELOBJ) {
7832 nlmsg_end(skb, nlh);
7833 return 0;
7834 }
7835
7836 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7837 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7838 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7839 goto nla_put_failure;
7840
7841 if (obj->udata &&
7842 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7843 goto nla_put_failure;
7844
7845 nlmsg_end(skb, nlh);
7846 return 0;
7847
7848 nla_put_failure:
7849 nlmsg_trim(skb, nlh);
7850 return -1;
7851 }
7852
audit_log_obj_reset(const struct nft_table * table,unsigned int base_seq,unsigned int nentries)7853 static void audit_log_obj_reset(const struct nft_table *table,
7854 unsigned int base_seq, unsigned int nentries)
7855 {
7856 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7857
7858 audit_log_nfcfg(buf, table->family, nentries,
7859 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7860 kfree(buf);
7861 }
7862
7863 struct nft_obj_dump_ctx {
7864 unsigned int s_idx;
7865 char *table;
7866 u32 type;
7867 bool reset;
7868 };
7869
nf_tables_dump_obj(struct sk_buff * skb,struct netlink_callback * cb)7870 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7871 {
7872 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7873 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7874 struct net *net = sock_net(skb->sk);
7875 int family = nfmsg->nfgen_family;
7876 struct nftables_pernet *nft_net;
7877 const struct nft_table *table;
7878 unsigned int entries = 0;
7879 struct nft_object *obj;
7880 unsigned int idx = 0;
7881 int rc = 0;
7882
7883 rcu_read_lock();
7884 nft_net = nft_pernet(net);
7885 cb->seq = READ_ONCE(nft_net->base_seq);
7886
7887 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7888 if (family != NFPROTO_UNSPEC && family != table->family)
7889 continue;
7890
7891 entries = 0;
7892 list_for_each_entry_rcu(obj, &table->objects, list) {
7893 if (!nft_is_active(net, obj))
7894 goto cont;
7895 if (idx < ctx->s_idx)
7896 goto cont;
7897 if (ctx->table && strcmp(ctx->table, table->name))
7898 goto cont;
7899 if (ctx->type != NFT_OBJECT_UNSPEC &&
7900 obj->ops->type->type != ctx->type)
7901 goto cont;
7902
7903 rc = nf_tables_fill_obj_info(skb, net,
7904 NETLINK_CB(cb->skb).portid,
7905 cb->nlh->nlmsg_seq,
7906 NFT_MSG_NEWOBJ,
7907 NLM_F_MULTI | NLM_F_APPEND,
7908 table->family, table,
7909 obj, ctx->reset);
7910 if (rc < 0)
7911 break;
7912
7913 entries++;
7914 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7915 cont:
7916 idx++;
7917 }
7918 if (ctx->reset && entries)
7919 audit_log_obj_reset(table, nft_net->base_seq, entries);
7920 if (rc < 0)
7921 break;
7922 }
7923 rcu_read_unlock();
7924
7925 ctx->s_idx = idx;
7926 return skb->len;
7927 }
7928
nf_tables_dumpreset_obj(struct sk_buff * skb,struct netlink_callback * cb)7929 static int nf_tables_dumpreset_obj(struct sk_buff *skb,
7930 struct netlink_callback *cb)
7931 {
7932 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
7933 int ret;
7934
7935 mutex_lock(&nft_net->commit_mutex);
7936 ret = nf_tables_dump_obj(skb, cb);
7937 mutex_unlock(&nft_net->commit_mutex);
7938
7939 return ret;
7940 }
7941
nf_tables_dump_obj_start(struct netlink_callback * cb)7942 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7943 {
7944 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7945 const struct nlattr * const *nla = cb->data;
7946
7947 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7948
7949 if (nla[NFTA_OBJ_TABLE]) {
7950 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7951 if (!ctx->table)
7952 return -ENOMEM;
7953 }
7954
7955 if (nla[NFTA_OBJ_TYPE])
7956 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7957
7958 return 0;
7959 }
7960
nf_tables_dumpreset_obj_start(struct netlink_callback * cb)7961 static int nf_tables_dumpreset_obj_start(struct netlink_callback *cb)
7962 {
7963 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7964
7965 ctx->reset = true;
7966
7967 return nf_tables_dump_obj_start(cb);
7968 }
7969
nf_tables_dump_obj_done(struct netlink_callback * cb)7970 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7971 {
7972 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7973
7974 kfree(ctx->table);
7975
7976 return 0;
7977 }
7978
7979 /* Caller must hold rcu read lock or transaction mutex */
7980 static struct sk_buff *
nf_tables_getobj_single(u32 portid,const struct nfnl_info * info,const struct nlattr * const nla[],bool reset)7981 nf_tables_getobj_single(u32 portid, const struct nfnl_info *info,
7982 const struct nlattr * const nla[], bool reset)
7983 {
7984 struct netlink_ext_ack *extack = info->extack;
7985 u8 genmask = nft_genmask_cur(info->net);
7986 u8 family = info->nfmsg->nfgen_family;
7987 const struct nft_table *table;
7988 struct net *net = info->net;
7989 struct nft_object *obj;
7990 struct sk_buff *skb2;
7991 u32 objtype;
7992 int err;
7993
7994 if (!nla[NFTA_OBJ_NAME] ||
7995 !nla[NFTA_OBJ_TYPE])
7996 return ERR_PTR(-EINVAL);
7997
7998 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7999 if (IS_ERR(table)) {
8000 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8001 return ERR_CAST(table);
8002 }
8003
8004 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8005 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
8006 if (IS_ERR(obj)) {
8007 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
8008 return ERR_CAST(obj);
8009 }
8010
8011 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8012 if (!skb2)
8013 return ERR_PTR(-ENOMEM);
8014
8015 err = nf_tables_fill_obj_info(skb2, net, portid,
8016 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
8017 family, table, obj, reset);
8018 if (err < 0) {
8019 kfree_skb(skb2);
8020 return ERR_PTR(err);
8021 }
8022
8023 return skb2;
8024 }
8025
nf_tables_getobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8026 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
8027 const struct nlattr * const nla[])
8028 {
8029 u32 portid = NETLINK_CB(skb).portid;
8030 struct sk_buff *skb2;
8031
8032 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8033 struct netlink_dump_control c = {
8034 .start = nf_tables_dump_obj_start,
8035 .dump = nf_tables_dump_obj,
8036 .done = nf_tables_dump_obj_done,
8037 .module = THIS_MODULE,
8038 .data = (void *)nla,
8039 };
8040
8041 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8042 }
8043
8044 skb2 = nf_tables_getobj_single(portid, info, nla, false);
8045 if (IS_ERR(skb2))
8046 return PTR_ERR(skb2);
8047
8048 return nfnetlink_unicast(skb2, info->net, portid);
8049 }
8050
nf_tables_getobj_reset(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8051 static int nf_tables_getobj_reset(struct sk_buff *skb,
8052 const struct nfnl_info *info,
8053 const struct nlattr * const nla[])
8054 {
8055 struct nftables_pernet *nft_net = nft_pernet(info->net);
8056 u32 portid = NETLINK_CB(skb).portid;
8057 struct net *net = info->net;
8058 struct sk_buff *skb2;
8059 char *buf;
8060
8061 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8062 struct netlink_dump_control c = {
8063 .start = nf_tables_dumpreset_obj_start,
8064 .dump = nf_tables_dumpreset_obj,
8065 .done = nf_tables_dump_obj_done,
8066 .module = THIS_MODULE,
8067 .data = (void *)nla,
8068 };
8069
8070 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8071 }
8072
8073 if (!try_module_get(THIS_MODULE))
8074 return -EINVAL;
8075 rcu_read_unlock();
8076 mutex_lock(&nft_net->commit_mutex);
8077 skb2 = nf_tables_getobj_single(portid, info, nla, true);
8078 mutex_unlock(&nft_net->commit_mutex);
8079 rcu_read_lock();
8080 module_put(THIS_MODULE);
8081
8082 if (IS_ERR(skb2))
8083 return PTR_ERR(skb2);
8084
8085 buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
8086 nla_len(nla[NFTA_OBJ_TABLE]),
8087 (char *)nla_data(nla[NFTA_OBJ_TABLE]),
8088 nft_net->base_seq);
8089 audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
8090 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
8091 kfree(buf);
8092
8093 return nfnetlink_unicast(skb2, net, portid);
8094 }
8095
nft_obj_destroy(const struct nft_ctx * ctx,struct nft_object * obj)8096 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
8097 {
8098 if (obj->ops->destroy)
8099 obj->ops->destroy(ctx, obj);
8100
8101 module_put(obj->ops->type->owner);
8102 kfree(obj->key.name);
8103 kfree(obj->udata);
8104 kfree(obj);
8105 }
8106
nf_tables_delobj(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8107 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
8108 const struct nlattr * const nla[])
8109 {
8110 struct netlink_ext_ack *extack = info->extack;
8111 u8 genmask = nft_genmask_next(info->net);
8112 u8 family = info->nfmsg->nfgen_family;
8113 struct net *net = info->net;
8114 const struct nlattr *attr;
8115 struct nft_table *table;
8116 struct nft_object *obj;
8117 struct nft_ctx ctx;
8118 u32 objtype;
8119
8120 if (!nla[NFTA_OBJ_TYPE] ||
8121 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8122 return -EINVAL;
8123
8124 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8125 NETLINK_CB(skb).portid);
8126 if (IS_ERR(table)) {
8127 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8128 return PTR_ERR(table);
8129 }
8130
8131 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8132 if (nla[NFTA_OBJ_HANDLE]) {
8133 attr = nla[NFTA_OBJ_HANDLE];
8134 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8135 } else {
8136 attr = nla[NFTA_OBJ_NAME];
8137 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8138 }
8139
8140 if (IS_ERR(obj)) {
8141 if (PTR_ERR(obj) == -ENOENT &&
8142 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8143 return 0;
8144
8145 NL_SET_BAD_ATTR(extack, attr);
8146 return PTR_ERR(obj);
8147 }
8148 if (obj->use > 0) {
8149 NL_SET_BAD_ATTR(extack, attr);
8150 return -EBUSY;
8151 }
8152
8153 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8154
8155 return nft_delobj(&ctx, obj);
8156 }
8157
8158 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)8159 __nft_obj_notify(struct net *net, const struct nft_table *table,
8160 struct nft_object *obj, u32 portid, u32 seq, int event,
8161 u16 flags, int family, int report, gfp_t gfp)
8162 {
8163 struct nftables_pernet *nft_net = nft_pernet(net);
8164 struct sk_buff *skb;
8165 int err;
8166
8167 if (!report &&
8168 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8169 return;
8170
8171 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8172 if (skb == NULL)
8173 goto err;
8174
8175 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8176 flags & (NLM_F_CREATE | NLM_F_EXCL),
8177 family, table, obj, false);
8178 if (err < 0) {
8179 kfree_skb(skb);
8180 goto err;
8181 }
8182
8183 nft_notify_enqueue(skb, report, &nft_net->notify_list);
8184 return;
8185 err:
8186 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8187 }
8188
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)8189 void nft_obj_notify(struct net *net, const struct nft_table *table,
8190 struct nft_object *obj, u32 portid, u32 seq, int event,
8191 u16 flags, int family, int report, gfp_t gfp)
8192 {
8193 struct nftables_pernet *nft_net = nft_pernet(net);
8194 char *buf = kasprintf(gfp, "%s:%u",
8195 table->name, nft_net->base_seq);
8196
8197 audit_log_nfcfg(buf,
8198 family,
8199 obj->handle,
8200 event == NFT_MSG_NEWOBJ ?
8201 AUDIT_NFT_OP_OBJ_REGISTER :
8202 AUDIT_NFT_OP_OBJ_UNREGISTER,
8203 gfp);
8204 kfree(buf);
8205
8206 __nft_obj_notify(net, table, obj, portid, seq, event,
8207 flags, family, report, gfp);
8208 }
8209 EXPORT_SYMBOL_GPL(nft_obj_notify);
8210
nf_tables_obj_notify(const struct nft_ctx * ctx,struct nft_object * obj,int event)8211 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8212 struct nft_object *obj, int event)
8213 {
8214 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8215 ctx->seq, event, ctx->flags, ctx->family,
8216 ctx->report, GFP_KERNEL);
8217 }
8218
8219 /*
8220 * Flow tables
8221 */
nft_register_flowtable_type(struct nf_flowtable_type * type)8222 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8223 {
8224 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8225 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8226 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8227 }
8228 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8229
nft_unregister_flowtable_type(struct nf_flowtable_type * type)8230 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8231 {
8232 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8233 list_del_rcu(&type->list);
8234 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8235 }
8236 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8237
8238 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8239 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
8240 .len = NFT_NAME_MAXLEN - 1 },
8241 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
8242 .len = NFT_NAME_MAXLEN - 1 },
8243 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
8244 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8245 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
8246 };
8247
nft_flowtable_lookup(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8248 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8249 const struct nlattr *nla, u8 genmask)
8250 {
8251 struct nft_flowtable *flowtable;
8252
8253 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8254 if (!nla_strcmp(nla, flowtable->name) &&
8255 nft_active_genmask(flowtable, genmask))
8256 return flowtable;
8257 }
8258 return ERR_PTR(-ENOENT);
8259 }
8260 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8261
nf_tables_deactivate_flowtable(const struct nft_ctx * ctx,struct nft_flowtable * flowtable,enum nft_trans_phase phase)8262 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8263 struct nft_flowtable *flowtable,
8264 enum nft_trans_phase phase)
8265 {
8266 switch (phase) {
8267 case NFT_TRANS_PREPARE_ERROR:
8268 case NFT_TRANS_PREPARE:
8269 case NFT_TRANS_ABORT:
8270 case NFT_TRANS_RELEASE:
8271 nft_use_dec(&flowtable->use);
8272 fallthrough;
8273 default:
8274 return;
8275 }
8276 }
8277 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8278
8279 static struct nft_flowtable *
nft_flowtable_lookup_byhandle(const struct nft_table * table,const struct nlattr * nla,u8 genmask)8280 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8281 const struct nlattr *nla, u8 genmask)
8282 {
8283 struct nft_flowtable *flowtable;
8284
8285 list_for_each_entry(flowtable, &table->flowtables, list) {
8286 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8287 nft_active_genmask(flowtable, genmask))
8288 return flowtable;
8289 }
8290 return ERR_PTR(-ENOENT);
8291 }
8292
8293 struct nft_flowtable_hook {
8294 u32 num;
8295 int priority;
8296 struct list_head list;
8297 };
8298
8299 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8300 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8301 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8302 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8303 };
8304
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)8305 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8306 const struct nlattr * const nla[],
8307 struct nft_flowtable_hook *flowtable_hook,
8308 struct nft_flowtable *flowtable,
8309 struct netlink_ext_ack *extack, bool add)
8310 {
8311 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8312 struct nft_hook *hook;
8313 int hooknum, priority;
8314 int err;
8315
8316 INIT_LIST_HEAD(&flowtable_hook->list);
8317
8318 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8319 nla[NFTA_FLOWTABLE_HOOK],
8320 nft_flowtable_hook_policy, NULL);
8321 if (err < 0)
8322 return err;
8323
8324 if (add) {
8325 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8326 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8327 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8328 return -ENOENT;
8329 }
8330
8331 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8332 if (hooknum != NF_NETDEV_INGRESS)
8333 return -EOPNOTSUPP;
8334
8335 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8336
8337 flowtable_hook->priority = priority;
8338 flowtable_hook->num = hooknum;
8339 } else {
8340 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8341 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8342 if (hooknum != flowtable->hooknum)
8343 return -EOPNOTSUPP;
8344 }
8345
8346 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8347 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8348 if (priority != flowtable->data.priority)
8349 return -EOPNOTSUPP;
8350 }
8351
8352 flowtable_hook->priority = flowtable->data.priority;
8353 flowtable_hook->num = flowtable->hooknum;
8354 }
8355
8356 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8357 err = nf_tables_parse_netdev_hooks(ctx->net,
8358 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8359 &flowtable_hook->list,
8360 extack);
8361 if (err < 0)
8362 return err;
8363 }
8364
8365 list_for_each_entry(hook, &flowtable_hook->list, list) {
8366 hook->ops.pf = NFPROTO_NETDEV;
8367 hook->ops.hooknum = flowtable_hook->num;
8368 hook->ops.priority = flowtable_hook->priority;
8369 hook->ops.priv = &flowtable->data;
8370 hook->ops.hook = flowtable->data.type->hook;
8371 }
8372
8373 return err;
8374 }
8375
8376 /* call under rcu_read_lock */
__nft_flowtable_type_get(u8 family)8377 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8378 {
8379 const struct nf_flowtable_type *type;
8380
8381 list_for_each_entry_rcu(type, &nf_tables_flowtables, list) {
8382 if (family == type->family)
8383 return type;
8384 }
8385 return NULL;
8386 }
8387
8388 static const struct nf_flowtable_type *
nft_flowtable_type_get(struct net * net,u8 family)8389 nft_flowtable_type_get(struct net *net, u8 family)
8390 {
8391 const struct nf_flowtable_type *type;
8392
8393 rcu_read_lock();
8394 type = __nft_flowtable_type_get(family);
8395 if (type != NULL && try_module_get(type->owner)) {
8396 rcu_read_unlock();
8397 return type;
8398 }
8399 rcu_read_unlock();
8400
8401 lockdep_nfnl_nft_mutex_not_held();
8402 #ifdef CONFIG_MODULES
8403 if (type == NULL) {
8404 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8405 return ERR_PTR(-EAGAIN);
8406 }
8407 #endif
8408 return ERR_PTR(-ENOENT);
8409 }
8410
8411 /* Only called from error and netdev event paths. */
nft_unregister_flowtable_hook(struct net * net,struct nft_flowtable * flowtable,struct nft_hook * hook)8412 static void nft_unregister_flowtable_hook(struct net *net,
8413 struct nft_flowtable *flowtable,
8414 struct nft_hook *hook)
8415 {
8416 nf_unregister_net_hook(net, &hook->ops);
8417 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8418 FLOW_BLOCK_UNBIND);
8419 }
8420
__nft_unregister_flowtable_net_hooks(struct net * net,struct nft_flowtable * flowtable,struct list_head * hook_list,bool release_netdev)8421 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8422 struct nft_flowtable *flowtable,
8423 struct list_head *hook_list,
8424 bool release_netdev)
8425 {
8426 struct nft_hook *hook, *next;
8427
8428 list_for_each_entry_safe(hook, next, hook_list, list) {
8429 nf_unregister_net_hook(net, &hook->ops);
8430 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8431 FLOW_BLOCK_UNBIND);
8432 if (release_netdev) {
8433 list_del(&hook->list);
8434 kfree_rcu(hook, rcu);
8435 }
8436 }
8437 }
8438
nft_unregister_flowtable_net_hooks(struct net * net,struct nft_flowtable * flowtable,struct list_head * hook_list)8439 static void nft_unregister_flowtable_net_hooks(struct net *net,
8440 struct nft_flowtable *flowtable,
8441 struct list_head *hook_list)
8442 {
8443 __nft_unregister_flowtable_net_hooks(net, flowtable, hook_list, false);
8444 }
8445
nft_register_flowtable_net_hooks(struct net * net,struct nft_table * table,struct list_head * hook_list,struct nft_flowtable * flowtable)8446 static int nft_register_flowtable_net_hooks(struct net *net,
8447 struct nft_table *table,
8448 struct list_head *hook_list,
8449 struct nft_flowtable *flowtable)
8450 {
8451 struct nft_hook *hook, *hook2, *next;
8452 struct nft_flowtable *ft;
8453 int err, i = 0;
8454
8455 list_for_each_entry(hook, hook_list, list) {
8456 list_for_each_entry(ft, &table->flowtables, list) {
8457 if (!nft_is_active_next(net, ft))
8458 continue;
8459
8460 list_for_each_entry(hook2, &ft->hook_list, list) {
8461 if (hook->ops.dev == hook2->ops.dev &&
8462 hook->ops.pf == hook2->ops.pf) {
8463 err = -EEXIST;
8464 goto err_unregister_net_hooks;
8465 }
8466 }
8467 }
8468
8469 err = flowtable->data.type->setup(&flowtable->data,
8470 hook->ops.dev,
8471 FLOW_BLOCK_BIND);
8472 if (err < 0)
8473 goto err_unregister_net_hooks;
8474
8475 err = nf_register_net_hook(net, &hook->ops);
8476 if (err < 0) {
8477 flowtable->data.type->setup(&flowtable->data,
8478 hook->ops.dev,
8479 FLOW_BLOCK_UNBIND);
8480 goto err_unregister_net_hooks;
8481 }
8482
8483 i++;
8484 }
8485
8486 return 0;
8487
8488 err_unregister_net_hooks:
8489 list_for_each_entry_safe(hook, next, hook_list, list) {
8490 if (i-- <= 0)
8491 break;
8492
8493 nft_unregister_flowtable_hook(net, flowtable, hook);
8494 list_del_rcu(&hook->list);
8495 kfree_rcu(hook, rcu);
8496 }
8497
8498 return err;
8499 }
8500
nft_hooks_destroy(struct list_head * hook_list)8501 static void nft_hooks_destroy(struct list_head *hook_list)
8502 {
8503 struct nft_hook *hook, *next;
8504
8505 list_for_each_entry_safe(hook, next, hook_list, list) {
8506 list_del_rcu(&hook->list);
8507 kfree_rcu(hook, rcu);
8508 }
8509 }
8510
nft_flowtable_update(struct nft_ctx * ctx,const struct nlmsghdr * nlh,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8511 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8512 struct nft_flowtable *flowtable,
8513 struct netlink_ext_ack *extack)
8514 {
8515 const struct nlattr * const *nla = ctx->nla;
8516 struct nft_flowtable_hook flowtable_hook;
8517 struct nft_hook *hook, *next;
8518 struct nft_trans *trans;
8519 bool unregister = false;
8520 u32 flags;
8521 int err;
8522
8523 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8524 extack, false);
8525 if (err < 0)
8526 return err;
8527
8528 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8529 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8530 list_del(&hook->list);
8531 kfree(hook);
8532 }
8533 }
8534
8535 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8536 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8537 if (flags & ~NFT_FLOWTABLE_MASK) {
8538 err = -EOPNOTSUPP;
8539 goto err_flowtable_update_hook;
8540 }
8541 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8542 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8543 err = -EOPNOTSUPP;
8544 goto err_flowtable_update_hook;
8545 }
8546 } else {
8547 flags = flowtable->data.flags;
8548 }
8549
8550 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8551 &flowtable_hook.list, flowtable);
8552 if (err < 0)
8553 goto err_flowtable_update_hook;
8554
8555 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8556 sizeof(struct nft_trans_flowtable));
8557 if (!trans) {
8558 unregister = true;
8559 err = -ENOMEM;
8560 goto err_flowtable_update_hook;
8561 }
8562
8563 nft_trans_flowtable_flags(trans) = flags;
8564 nft_trans_flowtable(trans) = flowtable;
8565 nft_trans_flowtable_update(trans) = true;
8566 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8567 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8568
8569 nft_trans_commit_list_add_tail(ctx->net, trans);
8570
8571 return 0;
8572
8573 err_flowtable_update_hook:
8574 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8575 if (unregister)
8576 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8577 list_del_rcu(&hook->list);
8578 kfree_rcu(hook, rcu);
8579 }
8580
8581 return err;
8582
8583 }
8584
nf_tables_newflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8585 static int nf_tables_newflowtable(struct sk_buff *skb,
8586 const struct nfnl_info *info,
8587 const struct nlattr * const nla[])
8588 {
8589 struct netlink_ext_ack *extack = info->extack;
8590 struct nft_flowtable_hook flowtable_hook;
8591 u8 genmask = nft_genmask_next(info->net);
8592 u8 family = info->nfmsg->nfgen_family;
8593 const struct nf_flowtable_type *type;
8594 struct nft_flowtable *flowtable;
8595 struct net *net = info->net;
8596 struct nft_table *table;
8597 struct nft_trans *trans;
8598 struct nft_ctx ctx;
8599 int err;
8600
8601 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8602 !nla[NFTA_FLOWTABLE_NAME] ||
8603 !nla[NFTA_FLOWTABLE_HOOK])
8604 return -EINVAL;
8605
8606 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8607 genmask, NETLINK_CB(skb).portid);
8608 if (IS_ERR(table)) {
8609 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8610 return PTR_ERR(table);
8611 }
8612
8613 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8614 genmask);
8615 if (IS_ERR(flowtable)) {
8616 err = PTR_ERR(flowtable);
8617 if (err != -ENOENT) {
8618 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8619 return err;
8620 }
8621 } else {
8622 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8623 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8624 return -EEXIST;
8625 }
8626
8627 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8628
8629 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8630 }
8631
8632 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8633
8634 if (!nft_use_inc(&table->use))
8635 return -EMFILE;
8636
8637 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8638 if (!flowtable) {
8639 err = -ENOMEM;
8640 goto flowtable_alloc;
8641 }
8642
8643 flowtable->table = table;
8644 flowtable->handle = nf_tables_alloc_handle(table);
8645 INIT_LIST_HEAD(&flowtable->hook_list);
8646
8647 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8648 if (!flowtable->name) {
8649 err = -ENOMEM;
8650 goto err1;
8651 }
8652
8653 type = nft_flowtable_type_get(net, family);
8654 if (IS_ERR(type)) {
8655 err = PTR_ERR(type);
8656 goto err2;
8657 }
8658
8659 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8660 flowtable->data.flags =
8661 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8662 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8663 err = -EOPNOTSUPP;
8664 goto err3;
8665 }
8666 }
8667
8668 write_pnet(&flowtable->data.net, net);
8669 flowtable->data.type = type;
8670 err = type->init(&flowtable->data);
8671 if (err < 0)
8672 goto err3;
8673
8674 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8675 extack, true);
8676 if (err < 0)
8677 goto err_flowtable_parse_hooks;
8678
8679 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8680 flowtable->data.priority = flowtable_hook.priority;
8681 flowtable->hooknum = flowtable_hook.num;
8682
8683 trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8684 if (IS_ERR(trans)) {
8685 err = PTR_ERR(trans);
8686 goto err_flowtable_trans;
8687 }
8688
8689 /* This must be LAST to ensure no packets are walking over this flowtable. */
8690 err = nft_register_flowtable_net_hooks(ctx.net, table,
8691 &flowtable->hook_list,
8692 flowtable);
8693 if (err < 0)
8694 goto err_flowtable_hooks;
8695
8696 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8697
8698 return 0;
8699
8700 err_flowtable_hooks:
8701 nft_trans_destroy(trans);
8702 err_flowtable_trans:
8703 nft_hooks_destroy(&flowtable->hook_list);
8704 err_flowtable_parse_hooks:
8705 flowtable->data.type->free(&flowtable->data);
8706 err3:
8707 module_put(type->owner);
8708 err2:
8709 kfree(flowtable->name);
8710 err1:
8711 kfree(flowtable);
8712 flowtable_alloc:
8713 nft_use_dec_restore(&table->use);
8714
8715 return err;
8716 }
8717
nft_flowtable_hook_release(struct nft_flowtable_hook * flowtable_hook)8718 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8719 {
8720 struct nft_hook *this, *next;
8721
8722 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8723 list_del(&this->list);
8724 kfree(this);
8725 }
8726 }
8727
nft_delflowtable_hook(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct netlink_ext_ack * extack)8728 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8729 struct nft_flowtable *flowtable,
8730 struct netlink_ext_ack *extack)
8731 {
8732 const struct nlattr * const *nla = ctx->nla;
8733 struct nft_flowtable_hook flowtable_hook;
8734 LIST_HEAD(flowtable_del_list);
8735 struct nft_hook *this, *hook;
8736 struct nft_trans *trans;
8737 int err;
8738
8739 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8740 extack, false);
8741 if (err < 0)
8742 return err;
8743
8744 list_for_each_entry(this, &flowtable_hook.list, list) {
8745 hook = nft_hook_list_find(&flowtable->hook_list, this);
8746 if (!hook) {
8747 err = -ENOENT;
8748 goto err_flowtable_del_hook;
8749 }
8750 list_move(&hook->list, &flowtable_del_list);
8751 }
8752
8753 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8754 sizeof(struct nft_trans_flowtable));
8755 if (!trans) {
8756 err = -ENOMEM;
8757 goto err_flowtable_del_hook;
8758 }
8759
8760 nft_trans_flowtable(trans) = flowtable;
8761 nft_trans_flowtable_update(trans) = true;
8762 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8763 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8764 nft_flowtable_hook_release(&flowtable_hook);
8765
8766 nft_trans_commit_list_add_tail(ctx->net, trans);
8767
8768 return 0;
8769
8770 err_flowtable_del_hook:
8771 list_splice(&flowtable_del_list, &flowtable->hook_list);
8772 nft_flowtable_hook_release(&flowtable_hook);
8773
8774 return err;
8775 }
8776
nf_tables_delflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8777 static int nf_tables_delflowtable(struct sk_buff *skb,
8778 const struct nfnl_info *info,
8779 const struct nlattr * const nla[])
8780 {
8781 struct netlink_ext_ack *extack = info->extack;
8782 u8 genmask = nft_genmask_next(info->net);
8783 u8 family = info->nfmsg->nfgen_family;
8784 struct nft_flowtable *flowtable;
8785 struct net *net = info->net;
8786 const struct nlattr *attr;
8787 struct nft_table *table;
8788 struct nft_ctx ctx;
8789
8790 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8791 (!nla[NFTA_FLOWTABLE_NAME] &&
8792 !nla[NFTA_FLOWTABLE_HANDLE]))
8793 return -EINVAL;
8794
8795 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8796 genmask, NETLINK_CB(skb).portid);
8797 if (IS_ERR(table)) {
8798 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8799 return PTR_ERR(table);
8800 }
8801
8802 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8803 attr = nla[NFTA_FLOWTABLE_HANDLE];
8804 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8805 } else {
8806 attr = nla[NFTA_FLOWTABLE_NAME];
8807 flowtable = nft_flowtable_lookup(table, attr, genmask);
8808 }
8809
8810 if (IS_ERR(flowtable)) {
8811 if (PTR_ERR(flowtable) == -ENOENT &&
8812 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8813 return 0;
8814
8815 NL_SET_BAD_ATTR(extack, attr);
8816 return PTR_ERR(flowtable);
8817 }
8818
8819 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8820
8821 if (nla[NFTA_FLOWTABLE_HOOK])
8822 return nft_delflowtable_hook(&ctx, flowtable, extack);
8823
8824 if (flowtable->use > 0) {
8825 NL_SET_BAD_ATTR(extack, attr);
8826 return -EBUSY;
8827 }
8828
8829 return nft_delflowtable(&ctx, flowtable);
8830 }
8831
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)8832 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8833 u32 portid, u32 seq, int event,
8834 u32 flags, int family,
8835 struct nft_flowtable *flowtable,
8836 struct list_head *hook_list)
8837 {
8838 struct nlattr *nest, *nest_devs;
8839 struct nft_hook *hook;
8840 struct nlmsghdr *nlh;
8841
8842 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8843 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8844 NFNETLINK_V0, nft_base_seq(net));
8845 if (!nlh)
8846 goto nla_put_failure;
8847
8848 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8849 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8850 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8851 NFTA_FLOWTABLE_PAD))
8852 goto nla_put_failure;
8853
8854 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8855 nlmsg_end(skb, nlh);
8856 return 0;
8857 }
8858
8859 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8860 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8861 goto nla_put_failure;
8862
8863 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8864 if (!nest)
8865 goto nla_put_failure;
8866 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8867 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8868 goto nla_put_failure;
8869
8870 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8871 if (!nest_devs)
8872 goto nla_put_failure;
8873
8874 if (!hook_list)
8875 hook_list = &flowtable->hook_list;
8876
8877 list_for_each_entry_rcu(hook, hook_list, list) {
8878 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8879 goto nla_put_failure;
8880 }
8881 nla_nest_end(skb, nest_devs);
8882 nla_nest_end(skb, nest);
8883
8884 nlmsg_end(skb, nlh);
8885 return 0;
8886
8887 nla_put_failure:
8888 nlmsg_trim(skb, nlh);
8889 return -1;
8890 }
8891
8892 struct nft_flowtable_filter {
8893 char *table;
8894 };
8895
nf_tables_dump_flowtable(struct sk_buff * skb,struct netlink_callback * cb)8896 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8897 struct netlink_callback *cb)
8898 {
8899 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8900 struct nft_flowtable_filter *filter = cb->data;
8901 unsigned int idx = 0, s_idx = cb->args[0];
8902 struct net *net = sock_net(skb->sk);
8903 int family = nfmsg->nfgen_family;
8904 struct nft_flowtable *flowtable;
8905 struct nftables_pernet *nft_net;
8906 const struct nft_table *table;
8907
8908 rcu_read_lock();
8909 nft_net = nft_pernet(net);
8910 cb->seq = READ_ONCE(nft_net->base_seq);
8911
8912 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8913 if (family != NFPROTO_UNSPEC && family != table->family)
8914 continue;
8915
8916 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8917 if (!nft_is_active(net, flowtable))
8918 goto cont;
8919 if (idx < s_idx)
8920 goto cont;
8921 if (idx > s_idx)
8922 memset(&cb->args[1], 0,
8923 sizeof(cb->args) - sizeof(cb->args[0]));
8924 if (filter && filter->table &&
8925 strcmp(filter->table, table->name))
8926 goto cont;
8927
8928 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8929 cb->nlh->nlmsg_seq,
8930 NFT_MSG_NEWFLOWTABLE,
8931 NLM_F_MULTI | NLM_F_APPEND,
8932 table->family,
8933 flowtable, NULL) < 0)
8934 goto done;
8935
8936 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8937 cont:
8938 idx++;
8939 }
8940 }
8941 done:
8942 rcu_read_unlock();
8943
8944 cb->args[0] = idx;
8945 return skb->len;
8946 }
8947
nf_tables_dump_flowtable_start(struct netlink_callback * cb)8948 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8949 {
8950 const struct nlattr * const *nla = cb->data;
8951 struct nft_flowtable_filter *filter = NULL;
8952
8953 if (nla[NFTA_FLOWTABLE_TABLE]) {
8954 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8955 if (!filter)
8956 return -ENOMEM;
8957
8958 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8959 GFP_ATOMIC);
8960 if (!filter->table) {
8961 kfree(filter);
8962 return -ENOMEM;
8963 }
8964 }
8965
8966 cb->data = filter;
8967 return 0;
8968 }
8969
nf_tables_dump_flowtable_done(struct netlink_callback * cb)8970 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8971 {
8972 struct nft_flowtable_filter *filter = cb->data;
8973
8974 if (!filter)
8975 return 0;
8976
8977 kfree(filter->table);
8978 kfree(filter);
8979
8980 return 0;
8981 }
8982
8983 /* called with rcu_read_lock held */
nf_tables_getflowtable(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])8984 static int nf_tables_getflowtable(struct sk_buff *skb,
8985 const struct nfnl_info *info,
8986 const struct nlattr * const nla[])
8987 {
8988 u8 genmask = nft_genmask_cur(info->net);
8989 u8 family = info->nfmsg->nfgen_family;
8990 struct nft_flowtable *flowtable;
8991 const struct nft_table *table;
8992 struct net *net = info->net;
8993 struct sk_buff *skb2;
8994 int err;
8995
8996 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8997 struct netlink_dump_control c = {
8998 .start = nf_tables_dump_flowtable_start,
8999 .dump = nf_tables_dump_flowtable,
9000 .done = nf_tables_dump_flowtable_done,
9001 .module = THIS_MODULE,
9002 .data = (void *)nla,
9003 };
9004
9005 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
9006 }
9007
9008 if (!nla[NFTA_FLOWTABLE_NAME])
9009 return -EINVAL;
9010
9011 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
9012 genmask, 0);
9013 if (IS_ERR(table))
9014 return PTR_ERR(table);
9015
9016 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
9017 genmask);
9018 if (IS_ERR(flowtable))
9019 return PTR_ERR(flowtable);
9020
9021 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9022 if (!skb2)
9023 return -ENOMEM;
9024
9025 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
9026 info->nlh->nlmsg_seq,
9027 NFT_MSG_NEWFLOWTABLE, 0, family,
9028 flowtable, NULL);
9029 if (err < 0)
9030 goto err_fill_flowtable_info;
9031
9032 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
9033
9034 err_fill_flowtable_info:
9035 kfree_skb(skb2);
9036 return err;
9037 }
9038
nf_tables_flowtable_notify(struct nft_ctx * ctx,struct nft_flowtable * flowtable,struct list_head * hook_list,int event)9039 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
9040 struct nft_flowtable *flowtable,
9041 struct list_head *hook_list, int event)
9042 {
9043 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
9044 struct sk_buff *skb;
9045 u16 flags = 0;
9046 int err;
9047
9048 if (!ctx->report &&
9049 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
9050 return;
9051
9052 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9053 if (skb == NULL)
9054 goto err;
9055
9056 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
9057 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
9058
9059 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
9060 ctx->seq, event, flags,
9061 ctx->family, flowtable, hook_list);
9062 if (err < 0) {
9063 kfree_skb(skb);
9064 goto err;
9065 }
9066
9067 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
9068 return;
9069 err:
9070 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
9071 }
9072
nf_tables_flowtable_destroy(struct nft_flowtable * flowtable)9073 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
9074 {
9075 struct nft_hook *hook, *next;
9076
9077 flowtable->data.type->free(&flowtable->data);
9078 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
9079 list_del_rcu(&hook->list);
9080 kfree_rcu(hook, rcu);
9081 }
9082 kfree(flowtable->name);
9083 module_put(flowtable->data.type->owner);
9084 kfree(flowtable);
9085 }
9086
nf_tables_fill_gen_info(struct sk_buff * skb,struct net * net,u32 portid,u32 seq)9087 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
9088 u32 portid, u32 seq)
9089 {
9090 struct nftables_pernet *nft_net = nft_pernet(net);
9091 struct nlmsghdr *nlh;
9092 char buf[TASK_COMM_LEN];
9093 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
9094
9095 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
9096 NFNETLINK_V0, nft_base_seq(net));
9097 if (!nlh)
9098 goto nla_put_failure;
9099
9100 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
9101 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
9102 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
9103 goto nla_put_failure;
9104
9105 nlmsg_end(skb, nlh);
9106 return 0;
9107
9108 nla_put_failure:
9109 nlmsg_trim(skb, nlh);
9110 return -EMSGSIZE;
9111 }
9112
nft_flowtable_event(unsigned long event,struct net_device * dev,struct nft_flowtable * flowtable)9113 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9114 struct nft_flowtable *flowtable)
9115 {
9116 struct nft_hook *hook;
9117
9118 list_for_each_entry(hook, &flowtable->hook_list, list) {
9119 if (hook->ops.dev != dev)
9120 continue;
9121
9122 /* flow_offload_netdev_event() cleans up entries for us. */
9123 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9124 list_del_rcu(&hook->list);
9125 kfree_rcu(hook, rcu);
9126 break;
9127 }
9128 }
9129
nf_tables_flowtable_event(struct notifier_block * this,unsigned long event,void * ptr)9130 static int nf_tables_flowtable_event(struct notifier_block *this,
9131 unsigned long event, void *ptr)
9132 {
9133 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9134 struct nft_flowtable *flowtable;
9135 struct nftables_pernet *nft_net;
9136 struct nft_table *table;
9137 struct net *net;
9138
9139 if (event != NETDEV_UNREGISTER)
9140 return 0;
9141
9142 net = dev_net(dev);
9143 nft_net = nft_pernet(net);
9144 mutex_lock(&nft_net->commit_mutex);
9145 list_for_each_entry(table, &nft_net->tables, list) {
9146 list_for_each_entry(flowtable, &table->flowtables, list) {
9147 nft_flowtable_event(event, dev, flowtable);
9148 }
9149 }
9150 mutex_unlock(&nft_net->commit_mutex);
9151
9152 return NOTIFY_DONE;
9153 }
9154
9155 static struct notifier_block nf_tables_flowtable_notifier = {
9156 .notifier_call = nf_tables_flowtable_event,
9157 };
9158
nf_tables_gen_notify(struct net * net,struct sk_buff * skb,int event)9159 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9160 int event)
9161 {
9162 struct nlmsghdr *nlh = nlmsg_hdr(skb);
9163 struct sk_buff *skb2;
9164 int err;
9165
9166 if (!nlmsg_report(nlh) &&
9167 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9168 return;
9169
9170 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9171 if (skb2 == NULL)
9172 goto err;
9173
9174 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9175 nlh->nlmsg_seq);
9176 if (err < 0) {
9177 kfree_skb(skb2);
9178 goto err;
9179 }
9180
9181 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9182 nlmsg_report(nlh), GFP_KERNEL);
9183 return;
9184 err:
9185 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9186 -ENOBUFS);
9187 }
9188
nf_tables_getgen(struct sk_buff * skb,const struct nfnl_info * info,const struct nlattr * const nla[])9189 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9190 const struct nlattr * const nla[])
9191 {
9192 struct sk_buff *skb2;
9193 int err;
9194
9195 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9196 if (skb2 == NULL)
9197 return -ENOMEM;
9198
9199 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9200 info->nlh->nlmsg_seq);
9201 if (err < 0)
9202 goto err_fill_gen_info;
9203
9204 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9205
9206 err_fill_gen_info:
9207 kfree_skb(skb2);
9208 return err;
9209 }
9210
9211 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9212 [NFT_MSG_NEWTABLE] = {
9213 .call = nf_tables_newtable,
9214 .type = NFNL_CB_BATCH,
9215 .attr_count = NFTA_TABLE_MAX,
9216 .policy = nft_table_policy,
9217 },
9218 [NFT_MSG_GETTABLE] = {
9219 .call = nf_tables_gettable,
9220 .type = NFNL_CB_RCU,
9221 .attr_count = NFTA_TABLE_MAX,
9222 .policy = nft_table_policy,
9223 },
9224 [NFT_MSG_DELTABLE] = {
9225 .call = nf_tables_deltable,
9226 .type = NFNL_CB_BATCH,
9227 .attr_count = NFTA_TABLE_MAX,
9228 .policy = nft_table_policy,
9229 },
9230 [NFT_MSG_DESTROYTABLE] = {
9231 .call = nf_tables_deltable,
9232 .type = NFNL_CB_BATCH,
9233 .attr_count = NFTA_TABLE_MAX,
9234 .policy = nft_table_policy,
9235 },
9236 [NFT_MSG_NEWCHAIN] = {
9237 .call = nf_tables_newchain,
9238 .type = NFNL_CB_BATCH,
9239 .attr_count = NFTA_CHAIN_MAX,
9240 .policy = nft_chain_policy,
9241 },
9242 [NFT_MSG_GETCHAIN] = {
9243 .call = nf_tables_getchain,
9244 .type = NFNL_CB_RCU,
9245 .attr_count = NFTA_CHAIN_MAX,
9246 .policy = nft_chain_policy,
9247 },
9248 [NFT_MSG_DELCHAIN] = {
9249 .call = nf_tables_delchain,
9250 .type = NFNL_CB_BATCH,
9251 .attr_count = NFTA_CHAIN_MAX,
9252 .policy = nft_chain_policy,
9253 },
9254 [NFT_MSG_DESTROYCHAIN] = {
9255 .call = nf_tables_delchain,
9256 .type = NFNL_CB_BATCH,
9257 .attr_count = NFTA_CHAIN_MAX,
9258 .policy = nft_chain_policy,
9259 },
9260 [NFT_MSG_NEWRULE] = {
9261 .call = nf_tables_newrule,
9262 .type = NFNL_CB_BATCH,
9263 .attr_count = NFTA_RULE_MAX,
9264 .policy = nft_rule_policy,
9265 },
9266 [NFT_MSG_GETRULE] = {
9267 .call = nf_tables_getrule,
9268 .type = NFNL_CB_RCU,
9269 .attr_count = NFTA_RULE_MAX,
9270 .policy = nft_rule_policy,
9271 },
9272 [NFT_MSG_GETRULE_RESET] = {
9273 .call = nf_tables_getrule,
9274 .type = NFNL_CB_RCU,
9275 .attr_count = NFTA_RULE_MAX,
9276 .policy = nft_rule_policy,
9277 },
9278 [NFT_MSG_DELRULE] = {
9279 .call = nf_tables_delrule,
9280 .type = NFNL_CB_BATCH,
9281 .attr_count = NFTA_RULE_MAX,
9282 .policy = nft_rule_policy,
9283 },
9284 [NFT_MSG_DESTROYRULE] = {
9285 .call = nf_tables_delrule,
9286 .type = NFNL_CB_BATCH,
9287 .attr_count = NFTA_RULE_MAX,
9288 .policy = nft_rule_policy,
9289 },
9290 [NFT_MSG_NEWSET] = {
9291 .call = nf_tables_newset,
9292 .type = NFNL_CB_BATCH,
9293 .attr_count = NFTA_SET_MAX,
9294 .policy = nft_set_policy,
9295 },
9296 [NFT_MSG_GETSET] = {
9297 .call = nf_tables_getset,
9298 .type = NFNL_CB_RCU,
9299 .attr_count = NFTA_SET_MAX,
9300 .policy = nft_set_policy,
9301 },
9302 [NFT_MSG_DELSET] = {
9303 .call = nf_tables_delset,
9304 .type = NFNL_CB_BATCH,
9305 .attr_count = NFTA_SET_MAX,
9306 .policy = nft_set_policy,
9307 },
9308 [NFT_MSG_DESTROYSET] = {
9309 .call = nf_tables_delset,
9310 .type = NFNL_CB_BATCH,
9311 .attr_count = NFTA_SET_MAX,
9312 .policy = nft_set_policy,
9313 },
9314 [NFT_MSG_NEWSETELEM] = {
9315 .call = nf_tables_newsetelem,
9316 .type = NFNL_CB_BATCH,
9317 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9318 .policy = nft_set_elem_list_policy,
9319 },
9320 [NFT_MSG_GETSETELEM] = {
9321 .call = nf_tables_getsetelem,
9322 .type = NFNL_CB_RCU,
9323 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9324 .policy = nft_set_elem_list_policy,
9325 },
9326 [NFT_MSG_GETSETELEM_RESET] = {
9327 .call = nf_tables_getsetelem,
9328 .type = NFNL_CB_RCU,
9329 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9330 .policy = nft_set_elem_list_policy,
9331 },
9332 [NFT_MSG_DELSETELEM] = {
9333 .call = nf_tables_delsetelem,
9334 .type = NFNL_CB_BATCH,
9335 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9336 .policy = nft_set_elem_list_policy,
9337 },
9338 [NFT_MSG_DESTROYSETELEM] = {
9339 .call = nf_tables_delsetelem,
9340 .type = NFNL_CB_BATCH,
9341 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9342 .policy = nft_set_elem_list_policy,
9343 },
9344 [NFT_MSG_GETGEN] = {
9345 .call = nf_tables_getgen,
9346 .type = NFNL_CB_RCU,
9347 },
9348 [NFT_MSG_NEWOBJ] = {
9349 .call = nf_tables_newobj,
9350 .type = NFNL_CB_BATCH,
9351 .attr_count = NFTA_OBJ_MAX,
9352 .policy = nft_obj_policy,
9353 },
9354 [NFT_MSG_GETOBJ] = {
9355 .call = nf_tables_getobj,
9356 .type = NFNL_CB_RCU,
9357 .attr_count = NFTA_OBJ_MAX,
9358 .policy = nft_obj_policy,
9359 },
9360 [NFT_MSG_DELOBJ] = {
9361 .call = nf_tables_delobj,
9362 .type = NFNL_CB_BATCH,
9363 .attr_count = NFTA_OBJ_MAX,
9364 .policy = nft_obj_policy,
9365 },
9366 [NFT_MSG_DESTROYOBJ] = {
9367 .call = nf_tables_delobj,
9368 .type = NFNL_CB_BATCH,
9369 .attr_count = NFTA_OBJ_MAX,
9370 .policy = nft_obj_policy,
9371 },
9372 [NFT_MSG_GETOBJ_RESET] = {
9373 .call = nf_tables_getobj_reset,
9374 .type = NFNL_CB_RCU,
9375 .attr_count = NFTA_OBJ_MAX,
9376 .policy = nft_obj_policy,
9377 },
9378 [NFT_MSG_NEWFLOWTABLE] = {
9379 .call = nf_tables_newflowtable,
9380 .type = NFNL_CB_BATCH,
9381 .attr_count = NFTA_FLOWTABLE_MAX,
9382 .policy = nft_flowtable_policy,
9383 },
9384 [NFT_MSG_GETFLOWTABLE] = {
9385 .call = nf_tables_getflowtable,
9386 .type = NFNL_CB_RCU,
9387 .attr_count = NFTA_FLOWTABLE_MAX,
9388 .policy = nft_flowtable_policy,
9389 },
9390 [NFT_MSG_DELFLOWTABLE] = {
9391 .call = nf_tables_delflowtable,
9392 .type = NFNL_CB_BATCH,
9393 .attr_count = NFTA_FLOWTABLE_MAX,
9394 .policy = nft_flowtable_policy,
9395 },
9396 [NFT_MSG_DESTROYFLOWTABLE] = {
9397 .call = nf_tables_delflowtable,
9398 .type = NFNL_CB_BATCH,
9399 .attr_count = NFTA_FLOWTABLE_MAX,
9400 .policy = nft_flowtable_policy,
9401 },
9402 };
9403
nf_tables_validate(struct net * net)9404 static int nf_tables_validate(struct net *net)
9405 {
9406 struct nftables_pernet *nft_net = nft_pernet(net);
9407 struct nft_table *table;
9408
9409 list_for_each_entry(table, &nft_net->tables, list) {
9410 switch (table->validate_state) {
9411 case NFT_VALIDATE_SKIP:
9412 continue;
9413 case NFT_VALIDATE_NEED:
9414 nft_validate_state_update(table, NFT_VALIDATE_DO);
9415 fallthrough;
9416 case NFT_VALIDATE_DO:
9417 if (nft_table_validate(net, table) < 0)
9418 return -EAGAIN;
9419
9420 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9421 break;
9422 }
9423 }
9424
9425 return 0;
9426 }
9427
9428 /* a drop policy has to be deferred until all rules have been activated,
9429 * otherwise a large ruleset that contains a drop-policy base chain will
9430 * cause all packets to get dropped until the full transaction has been
9431 * processed.
9432 *
9433 * We defer the drop policy until the transaction has been finalized.
9434 */
nft_chain_commit_drop_policy(struct nft_trans * trans)9435 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9436 {
9437 struct nft_base_chain *basechain;
9438
9439 if (nft_trans_chain_policy(trans) != NF_DROP)
9440 return;
9441
9442 if (!nft_is_base_chain(trans->ctx.chain))
9443 return;
9444
9445 basechain = nft_base_chain(trans->ctx.chain);
9446 basechain->policy = NF_DROP;
9447 }
9448
nft_chain_commit_update(struct nft_trans * trans)9449 static void nft_chain_commit_update(struct nft_trans *trans)
9450 {
9451 struct nft_base_chain *basechain;
9452
9453 if (nft_trans_chain_name(trans)) {
9454 rhltable_remove(&trans->ctx.table->chains_ht,
9455 &trans->ctx.chain->rhlhead,
9456 nft_chain_ht_params);
9457 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9458 rhltable_insert_key(&trans->ctx.table->chains_ht,
9459 trans->ctx.chain->name,
9460 &trans->ctx.chain->rhlhead,
9461 nft_chain_ht_params);
9462 }
9463
9464 if (!nft_is_base_chain(trans->ctx.chain))
9465 return;
9466
9467 nft_chain_stats_replace(trans);
9468
9469 basechain = nft_base_chain(trans->ctx.chain);
9470
9471 switch (nft_trans_chain_policy(trans)) {
9472 case NF_DROP:
9473 case NF_ACCEPT:
9474 basechain->policy = nft_trans_chain_policy(trans);
9475 break;
9476 }
9477 }
9478
nft_obj_commit_update(struct nft_trans * trans)9479 static void nft_obj_commit_update(struct nft_trans *trans)
9480 {
9481 struct nft_object *newobj;
9482 struct nft_object *obj;
9483
9484 obj = nft_trans_obj(trans);
9485 newobj = nft_trans_obj_newobj(trans);
9486
9487 if (WARN_ON_ONCE(!obj->ops->update))
9488 return;
9489
9490 obj->ops->update(obj, newobj);
9491 nft_obj_destroy(&trans->ctx, newobj);
9492 }
9493
nft_commit_release(struct nft_trans * trans)9494 static void nft_commit_release(struct nft_trans *trans)
9495 {
9496 switch (trans->msg_type) {
9497 case NFT_MSG_DELTABLE:
9498 case NFT_MSG_DESTROYTABLE:
9499 nf_tables_table_destroy(&trans->ctx);
9500 break;
9501 case NFT_MSG_NEWCHAIN:
9502 free_percpu(nft_trans_chain_stats(trans));
9503 kfree(nft_trans_chain_name(trans));
9504 break;
9505 case NFT_MSG_DELCHAIN:
9506 case NFT_MSG_DESTROYCHAIN:
9507 if (nft_trans_chain_update(trans))
9508 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9509 else
9510 nf_tables_chain_destroy(nft_trans_chain(trans));
9511 break;
9512 case NFT_MSG_DELRULE:
9513 case NFT_MSG_DESTROYRULE:
9514 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9515 break;
9516 case NFT_MSG_DELSET:
9517 case NFT_MSG_DESTROYSET:
9518 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9519 break;
9520 case NFT_MSG_DELSETELEM:
9521 case NFT_MSG_DESTROYSETELEM:
9522 nf_tables_set_elem_destroy(&trans->ctx,
9523 nft_trans_elem_set(trans),
9524 nft_trans_elem(trans).priv);
9525 break;
9526 case NFT_MSG_DELOBJ:
9527 case NFT_MSG_DESTROYOBJ:
9528 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9529 break;
9530 case NFT_MSG_DELFLOWTABLE:
9531 case NFT_MSG_DESTROYFLOWTABLE:
9532 if (nft_trans_flowtable_update(trans))
9533 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9534 else
9535 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9536 break;
9537 }
9538
9539 if (trans->put_net)
9540 put_net(trans->ctx.net);
9541
9542 kfree(trans);
9543 }
9544
nf_tables_trans_destroy_work(struct work_struct * w)9545 static void nf_tables_trans_destroy_work(struct work_struct *w)
9546 {
9547 struct nft_trans *trans, *next;
9548 LIST_HEAD(head);
9549
9550 spin_lock(&nf_tables_destroy_list_lock);
9551 list_splice_init(&nf_tables_destroy_list, &head);
9552 spin_unlock(&nf_tables_destroy_list_lock);
9553
9554 if (list_empty(&head))
9555 return;
9556
9557 synchronize_rcu();
9558
9559 list_for_each_entry_safe(trans, next, &head, list) {
9560 nft_trans_list_del(trans);
9561 nft_commit_release(trans);
9562 }
9563 }
9564
nf_tables_trans_destroy_flush_work(void)9565 void nf_tables_trans_destroy_flush_work(void)
9566 {
9567 flush_work(&trans_destroy_work);
9568 }
9569 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9570
nft_expr_reduce(struct nft_regs_track * track,const struct nft_expr * expr)9571 static bool nft_expr_reduce(struct nft_regs_track *track,
9572 const struct nft_expr *expr)
9573 {
9574 return false;
9575 }
9576
nf_tables_commit_chain_prepare(struct net * net,struct nft_chain * chain)9577 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9578 {
9579 const struct nft_expr *expr, *last;
9580 struct nft_regs_track track = {};
9581 unsigned int size, data_size;
9582 void *data, *data_boundary;
9583 struct nft_rule_dp *prule;
9584 struct nft_rule *rule;
9585
9586 /* already handled or inactive chain? */
9587 if (chain->blob_next || !nft_is_active_next(net, chain))
9588 return 0;
9589
9590 data_size = 0;
9591 list_for_each_entry(rule, &chain->rules, list) {
9592 if (nft_is_active_next(net, rule)) {
9593 data_size += sizeof(*prule) + rule->dlen;
9594 if (data_size > INT_MAX)
9595 return -ENOMEM;
9596 }
9597 }
9598
9599 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9600 if (!chain->blob_next)
9601 return -ENOMEM;
9602
9603 data = (void *)chain->blob_next->data;
9604 data_boundary = data + data_size;
9605 size = 0;
9606
9607 list_for_each_entry(rule, &chain->rules, list) {
9608 if (!nft_is_active_next(net, rule))
9609 continue;
9610
9611 prule = (struct nft_rule_dp *)data;
9612 data += offsetof(struct nft_rule_dp, data);
9613 if (WARN_ON_ONCE(data > data_boundary))
9614 return -ENOMEM;
9615
9616 size = 0;
9617 track.last = nft_expr_last(rule);
9618 nft_rule_for_each_expr(expr, last, rule) {
9619 track.cur = expr;
9620
9621 if (nft_expr_reduce(&track, expr)) {
9622 expr = track.cur;
9623 continue;
9624 }
9625
9626 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9627 return -ENOMEM;
9628
9629 memcpy(data + size, expr, expr->ops->size);
9630 size += expr->ops->size;
9631 }
9632 if (WARN_ON_ONCE(size >= 1 << 12))
9633 return -ENOMEM;
9634
9635 prule->handle = rule->handle;
9636 prule->dlen = size;
9637 prule->is_last = 0;
9638
9639 data += size;
9640 size = 0;
9641 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9642 }
9643
9644 if (WARN_ON_ONCE(data > data_boundary))
9645 return -ENOMEM;
9646
9647 prule = (struct nft_rule_dp *)data;
9648 nft_last_rule(chain, prule);
9649
9650 return 0;
9651 }
9652
nf_tables_commit_chain_prepare_cancel(struct net * net)9653 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9654 {
9655 struct nftables_pernet *nft_net = nft_pernet(net);
9656 struct nft_trans *trans, *next;
9657
9658 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9659 struct nft_chain *chain = trans->ctx.chain;
9660
9661 if (trans->msg_type == NFT_MSG_NEWRULE ||
9662 trans->msg_type == NFT_MSG_DELRULE) {
9663 kvfree(chain->blob_next);
9664 chain->blob_next = NULL;
9665 }
9666 }
9667 }
9668
__nf_tables_commit_chain_free_rules(struct rcu_head * h)9669 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9670 {
9671 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9672
9673 kvfree(l->blob);
9674 }
9675
nf_tables_commit_chain_free_rules_old(struct nft_rule_blob * blob)9676 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9677 {
9678 struct nft_rule_dp_last *last;
9679
9680 /* last rule trailer is after end marker */
9681 last = (void *)blob + sizeof(*blob) + blob->size;
9682 last->blob = blob;
9683
9684 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9685 }
9686
nf_tables_commit_chain(struct net * net,struct nft_chain * chain)9687 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9688 {
9689 struct nft_rule_blob *g0, *g1;
9690 bool next_genbit;
9691
9692 next_genbit = nft_gencursor_next(net);
9693
9694 g0 = rcu_dereference_protected(chain->blob_gen_0,
9695 lockdep_commit_lock_is_held(net));
9696 g1 = rcu_dereference_protected(chain->blob_gen_1,
9697 lockdep_commit_lock_is_held(net));
9698
9699 /* No changes to this chain? */
9700 if (chain->blob_next == NULL) {
9701 /* chain had no change in last or next generation */
9702 if (g0 == g1)
9703 return;
9704 /*
9705 * chain had no change in this generation; make sure next
9706 * one uses same rules as current generation.
9707 */
9708 if (next_genbit) {
9709 rcu_assign_pointer(chain->blob_gen_1, g0);
9710 nf_tables_commit_chain_free_rules_old(g1);
9711 } else {
9712 rcu_assign_pointer(chain->blob_gen_0, g1);
9713 nf_tables_commit_chain_free_rules_old(g0);
9714 }
9715
9716 return;
9717 }
9718
9719 if (next_genbit)
9720 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9721 else
9722 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9723
9724 chain->blob_next = NULL;
9725
9726 if (g0 == g1)
9727 return;
9728
9729 if (next_genbit)
9730 nf_tables_commit_chain_free_rules_old(g1);
9731 else
9732 nf_tables_commit_chain_free_rules_old(g0);
9733 }
9734
nft_obj_del(struct nft_object * obj)9735 static void nft_obj_del(struct nft_object *obj)
9736 {
9737 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9738 list_del_rcu(&obj->list);
9739 }
9740
nft_chain_del(struct nft_chain * chain)9741 void nft_chain_del(struct nft_chain *chain)
9742 {
9743 struct nft_table *table = chain->table;
9744
9745 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9746 nft_chain_ht_params));
9747 list_del_rcu(&chain->list);
9748 }
9749
nft_trans_gc_setelem_remove(struct nft_ctx * ctx,struct nft_trans_gc * trans)9750 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9751 struct nft_trans_gc *trans)
9752 {
9753 void **priv = trans->priv;
9754 unsigned int i;
9755
9756 for (i = 0; i < trans->count; i++) {
9757 struct nft_set_elem elem = {
9758 .priv = priv[i],
9759 };
9760
9761 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9762 nft_setelem_remove(ctx->net, trans->set, &elem);
9763 }
9764 }
9765
nft_trans_gc_destroy(struct nft_trans_gc * trans)9766 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9767 {
9768 nft_set_put(trans->set);
9769 put_net(trans->net);
9770 kfree(trans);
9771 }
9772
nft_trans_gc_trans_free(struct rcu_head * rcu)9773 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9774 {
9775 struct nft_set_elem elem = {};
9776 struct nft_trans_gc *trans;
9777 struct nft_ctx ctx = {};
9778 unsigned int i;
9779
9780 trans = container_of(rcu, struct nft_trans_gc, rcu);
9781 ctx.net = read_pnet(&trans->set->net);
9782
9783 for (i = 0; i < trans->count; i++) {
9784 elem.priv = trans->priv[i];
9785 if (!nft_setelem_is_catchall(trans->set, &elem))
9786 atomic_dec(&trans->set->nelems);
9787
9788 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9789 }
9790
9791 nft_trans_gc_destroy(trans);
9792 }
9793
nft_trans_gc_work_done(struct nft_trans_gc * trans)9794 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9795 {
9796 struct nftables_pernet *nft_net;
9797 struct nft_ctx ctx = {};
9798
9799 nft_net = nft_pernet(trans->net);
9800
9801 mutex_lock(&nft_net->commit_mutex);
9802
9803 /* Check for race with transaction, otherwise this batch refers to
9804 * stale objects that might not be there anymore. Skip transaction if
9805 * set has been destroyed from control plane transaction in case gc
9806 * worker loses race.
9807 */
9808 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9809 mutex_unlock(&nft_net->commit_mutex);
9810 return false;
9811 }
9812
9813 ctx.net = trans->net;
9814 ctx.table = trans->set->table;
9815
9816 nft_trans_gc_setelem_remove(&ctx, trans);
9817 mutex_unlock(&nft_net->commit_mutex);
9818
9819 return true;
9820 }
9821
nft_trans_gc_work(struct work_struct * work)9822 static void nft_trans_gc_work(struct work_struct *work)
9823 {
9824 struct nft_trans_gc *trans, *next;
9825 LIST_HEAD(trans_gc_list);
9826
9827 spin_lock(&nf_tables_gc_list_lock);
9828 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9829 spin_unlock(&nf_tables_gc_list_lock);
9830
9831 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9832 list_del(&trans->list);
9833 if (!nft_trans_gc_work_done(trans)) {
9834 nft_trans_gc_destroy(trans);
9835 continue;
9836 }
9837 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9838 }
9839 }
9840
nft_trans_gc_alloc(struct nft_set * set,unsigned int gc_seq,gfp_t gfp)9841 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9842 unsigned int gc_seq, gfp_t gfp)
9843 {
9844 struct net *net = read_pnet(&set->net);
9845 struct nft_trans_gc *trans;
9846
9847 trans = kzalloc(sizeof(*trans), gfp);
9848 if (!trans)
9849 return NULL;
9850
9851 trans->net = maybe_get_net(net);
9852 if (!trans->net) {
9853 kfree(trans);
9854 return NULL;
9855 }
9856
9857 refcount_inc(&set->refs);
9858 trans->set = set;
9859 trans->seq = gc_seq;
9860
9861 return trans;
9862 }
9863
nft_trans_gc_elem_add(struct nft_trans_gc * trans,void * priv)9864 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9865 {
9866 trans->priv[trans->count++] = priv;
9867 }
9868
nft_trans_gc_queue_work(struct nft_trans_gc * trans)9869 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9870 {
9871 spin_lock(&nf_tables_gc_list_lock);
9872 list_add_tail(&trans->list, &nf_tables_gc_list);
9873 spin_unlock(&nf_tables_gc_list_lock);
9874
9875 schedule_work(&trans_gc_work);
9876 }
9877
nft_trans_gc_space(struct nft_trans_gc * trans)9878 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9879 {
9880 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9881 }
9882
nft_trans_gc_queue_async(struct nft_trans_gc * gc,unsigned int gc_seq,gfp_t gfp)9883 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9884 unsigned int gc_seq, gfp_t gfp)
9885 {
9886 struct nft_set *set;
9887
9888 if (nft_trans_gc_space(gc))
9889 return gc;
9890
9891 set = gc->set;
9892 nft_trans_gc_queue_work(gc);
9893
9894 return nft_trans_gc_alloc(set, gc_seq, gfp);
9895 }
9896
nft_trans_gc_queue_async_done(struct nft_trans_gc * trans)9897 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9898 {
9899 if (trans->count == 0) {
9900 nft_trans_gc_destroy(trans);
9901 return;
9902 }
9903
9904 nft_trans_gc_queue_work(trans);
9905 }
9906
nft_trans_gc_queue_sync(struct nft_trans_gc * gc,gfp_t gfp)9907 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9908 {
9909 struct nft_set *set;
9910
9911 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9912 return NULL;
9913
9914 if (nft_trans_gc_space(gc))
9915 return gc;
9916
9917 set = gc->set;
9918 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9919
9920 return nft_trans_gc_alloc(set, 0, gfp);
9921 }
9922
nft_trans_gc_queue_sync_done(struct nft_trans_gc * trans)9923 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9924 {
9925 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9926
9927 if (trans->count == 0) {
9928 nft_trans_gc_destroy(trans);
9929 return;
9930 }
9931
9932 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9933 }
9934
nft_trans_gc_catchall_async(struct nft_trans_gc * gc,unsigned int gc_seq)9935 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9936 unsigned int gc_seq)
9937 {
9938 struct nft_set_elem_catchall *catchall;
9939 const struct nft_set *set = gc->set;
9940 struct nft_set_ext *ext;
9941
9942 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9943 ext = nft_set_elem_ext(set, catchall->elem);
9944
9945 if (!nft_set_elem_expired(ext))
9946 continue;
9947 if (nft_set_elem_is_dead(ext))
9948 goto dead_elem;
9949
9950 nft_set_elem_dead(ext);
9951 dead_elem:
9952 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9953 if (!gc)
9954 return NULL;
9955
9956 nft_trans_gc_elem_add(gc, catchall->elem);
9957 }
9958
9959 return gc;
9960 }
9961
nft_trans_gc_catchall_sync(struct nft_trans_gc * gc)9962 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9963 {
9964 struct nft_set_elem_catchall *catchall, *next;
9965 u64 tstamp = nft_net_tstamp(gc->net);
9966 const struct nft_set *set = gc->set;
9967 struct nft_set_elem elem;
9968 struct nft_set_ext *ext;
9969
9970 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9971
9972 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9973 ext = nft_set_elem_ext(set, catchall->elem);
9974
9975 if (!__nft_set_elem_expired(ext, tstamp))
9976 continue;
9977
9978 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9979 if (!gc)
9980 return NULL;
9981
9982 memset(&elem, 0, sizeof(elem));
9983 elem.priv = catchall->elem;
9984
9985 nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9986 nft_setelem_catchall_destroy(catchall);
9987 nft_trans_gc_elem_add(gc, elem.priv);
9988 }
9989
9990 return gc;
9991 }
9992
nf_tables_module_autoload_cleanup(struct net * net)9993 static void nf_tables_module_autoload_cleanup(struct net *net)
9994 {
9995 struct nftables_pernet *nft_net = nft_pernet(net);
9996 struct nft_module_request *req, *next;
9997
9998 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9999 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
10000 WARN_ON_ONCE(!req->done);
10001 list_del(&req->list);
10002 kfree(req);
10003 }
10004 }
10005
nf_tables_commit_release(struct net * net)10006 static void nf_tables_commit_release(struct net *net)
10007 {
10008 struct nftables_pernet *nft_net = nft_pernet(net);
10009 struct nft_trans *trans;
10010
10011 /* all side effects have to be made visible.
10012 * For example, if a chain named 'foo' has been deleted, a
10013 * new transaction must not find it anymore.
10014 *
10015 * Memory reclaim happens asynchronously from work queue
10016 * to prevent expensive synchronize_rcu() in commit phase.
10017 */
10018 if (list_empty(&nft_net->commit_list)) {
10019 nf_tables_module_autoload_cleanup(net);
10020 mutex_unlock(&nft_net->commit_mutex);
10021 return;
10022 }
10023
10024 trans = list_last_entry(&nft_net->commit_list,
10025 struct nft_trans, list);
10026 get_net(trans->ctx.net);
10027 WARN_ON_ONCE(trans->put_net);
10028
10029 trans->put_net = true;
10030 spin_lock(&nf_tables_destroy_list_lock);
10031 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
10032 spin_unlock(&nf_tables_destroy_list_lock);
10033
10034 nf_tables_module_autoload_cleanup(net);
10035 schedule_work(&trans_destroy_work);
10036
10037 mutex_unlock(&nft_net->commit_mutex);
10038 }
10039
nft_commit_notify(struct net * net,u32 portid)10040 static void nft_commit_notify(struct net *net, u32 portid)
10041 {
10042 struct nftables_pernet *nft_net = nft_pernet(net);
10043 struct sk_buff *batch_skb = NULL, *nskb, *skb;
10044 unsigned char *data;
10045 int len;
10046
10047 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
10048 if (!batch_skb) {
10049 new_batch:
10050 batch_skb = skb;
10051 len = NLMSG_GOODSIZE - skb->len;
10052 list_del(&skb->list);
10053 continue;
10054 }
10055 len -= skb->len;
10056 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
10057 data = skb_put(batch_skb, skb->len);
10058 memcpy(data, skb->data, skb->len);
10059 list_del(&skb->list);
10060 kfree_skb(skb);
10061 continue;
10062 }
10063 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
10064 NFT_CB(batch_skb).report, GFP_KERNEL);
10065 goto new_batch;
10066 }
10067
10068 if (batch_skb) {
10069 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
10070 NFT_CB(batch_skb).report, GFP_KERNEL);
10071 }
10072
10073 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10074 }
10075
nf_tables_commit_audit_alloc(struct list_head * adl,struct nft_table * table)10076 static int nf_tables_commit_audit_alloc(struct list_head *adl,
10077 struct nft_table *table)
10078 {
10079 struct nft_audit_data *adp;
10080
10081 list_for_each_entry(adp, adl, list) {
10082 if (adp->table == table)
10083 return 0;
10084 }
10085 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
10086 if (!adp)
10087 return -ENOMEM;
10088 adp->table = table;
10089 list_add(&adp->list, adl);
10090 return 0;
10091 }
10092
nf_tables_commit_audit_free(struct list_head * adl)10093 static void nf_tables_commit_audit_free(struct list_head *adl)
10094 {
10095 struct nft_audit_data *adp, *adn;
10096
10097 list_for_each_entry_safe(adp, adn, adl, list) {
10098 list_del(&adp->list);
10099 kfree(adp);
10100 }
10101 }
10102
nf_tables_commit_audit_collect(struct list_head * adl,struct nft_table * table,u32 op)10103 static void nf_tables_commit_audit_collect(struct list_head *adl,
10104 struct nft_table *table, u32 op)
10105 {
10106 struct nft_audit_data *adp;
10107
10108 list_for_each_entry(adp, adl, list) {
10109 if (adp->table == table)
10110 goto found;
10111 }
10112 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
10113 return;
10114 found:
10115 adp->entries++;
10116 if (!adp->op || adp->op > op)
10117 adp->op = op;
10118 }
10119
10120 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10121
nf_tables_commit_audit_log(struct list_head * adl,u32 generation)10122 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10123 {
10124 struct nft_audit_data *adp, *adn;
10125 char aubuf[AUNFTABLENAMELEN];
10126
10127 list_for_each_entry_safe(adp, adn, adl, list) {
10128 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10129 generation);
10130 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10131 nft2audit_op[adp->op], GFP_KERNEL);
10132 list_del(&adp->list);
10133 kfree(adp);
10134 }
10135 }
10136
nft_set_commit_update(struct list_head * set_update_list)10137 static void nft_set_commit_update(struct list_head *set_update_list)
10138 {
10139 struct nft_set *set, *next;
10140
10141 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10142 list_del_init(&set->pending_update);
10143
10144 if (!set->ops->commit || set->dead)
10145 continue;
10146
10147 set->ops->commit(set);
10148 }
10149 }
10150
nft_gc_seq_begin(struct nftables_pernet * nft_net)10151 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10152 {
10153 unsigned int gc_seq;
10154
10155 /* Bump gc counter, it becomes odd, this is the busy mark. */
10156 gc_seq = READ_ONCE(nft_net->gc_seq);
10157 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10158
10159 return gc_seq;
10160 }
10161
nft_gc_seq_end(struct nftables_pernet * nft_net,unsigned int gc_seq)10162 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10163 {
10164 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10165 }
10166
nf_tables_commit(struct net * net,struct sk_buff * skb)10167 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10168 {
10169 struct nftables_pernet *nft_net = nft_pernet(net);
10170 struct nft_trans *trans, *next;
10171 unsigned int base_seq, gc_seq;
10172 LIST_HEAD(set_update_list);
10173 struct nft_trans_elem *te;
10174 struct nft_chain *chain;
10175 struct nft_table *table;
10176 LIST_HEAD(adl);
10177 int err;
10178
10179 if (list_empty(&nft_net->commit_list)) {
10180 mutex_unlock(&nft_net->commit_mutex);
10181 return 0;
10182 }
10183
10184 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10185 switch (trans->msg_type) {
10186 case NFT_MSG_NEWSET:
10187 if (!nft_trans_set_update(trans) &&
10188 nft_set_is_anonymous(nft_trans_set(trans)) &&
10189 !nft_trans_set_bound(trans)) {
10190 pr_warn_once("nftables ruleset with unbound set\n");
10191 return -EINVAL;
10192 }
10193 break;
10194 case NFT_MSG_NEWCHAIN:
10195 if (!nft_trans_chain_update(trans) &&
10196 nft_chain_binding(nft_trans_chain(trans)) &&
10197 !nft_trans_chain_bound(trans)) {
10198 pr_warn_once("nftables ruleset with unbound chain\n");
10199 return -EINVAL;
10200 }
10201 break;
10202 }
10203 }
10204
10205 /* 0. Validate ruleset, otherwise roll back for error reporting. */
10206 if (nf_tables_validate(net) < 0) {
10207 nft_net->validate_state = NFT_VALIDATE_DO;
10208 return -EAGAIN;
10209 }
10210
10211 err = nft_flow_rule_offload_commit(net);
10212 if (err < 0)
10213 return err;
10214
10215 /* 1. Allocate space for next generation rules_gen_X[] */
10216 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10217 int ret;
10218
10219 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10220 if (ret) {
10221 nf_tables_commit_chain_prepare_cancel(net);
10222 nf_tables_commit_audit_free(&adl);
10223 return ret;
10224 }
10225 if (trans->msg_type == NFT_MSG_NEWRULE ||
10226 trans->msg_type == NFT_MSG_DELRULE) {
10227 chain = trans->ctx.chain;
10228
10229 ret = nf_tables_commit_chain_prepare(net, chain);
10230 if (ret < 0) {
10231 nf_tables_commit_chain_prepare_cancel(net);
10232 nf_tables_commit_audit_free(&adl);
10233 return ret;
10234 }
10235 }
10236 }
10237
10238 /* step 2. Make rules_gen_X visible to packet path */
10239 list_for_each_entry(table, &nft_net->tables, list) {
10240 list_for_each_entry(chain, &table->chains, list)
10241 nf_tables_commit_chain(net, chain);
10242 }
10243
10244 /*
10245 * Bump generation counter, invalidate any dump in progress.
10246 * Cannot fail after this point.
10247 */
10248 base_seq = READ_ONCE(nft_net->base_seq);
10249 while (++base_seq == 0)
10250 ;
10251
10252 WRITE_ONCE(nft_net->base_seq, base_seq);
10253
10254 gc_seq = nft_gc_seq_begin(nft_net);
10255
10256 /* step 3. Start new generation, rules_gen_X now in use. */
10257 net->nft.gencursor = nft_gencursor_next(net);
10258
10259 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10260 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10261 trans->msg_type);
10262 switch (trans->msg_type) {
10263 case NFT_MSG_NEWTABLE:
10264 if (nft_trans_table_update(trans)) {
10265 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10266 nft_trans_destroy(trans);
10267 break;
10268 }
10269 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10270 nf_tables_table_disable(net, trans->ctx.table);
10271
10272 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10273 } else {
10274 nft_clear(net, trans->ctx.table);
10275 }
10276 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10277 nft_trans_destroy(trans);
10278 break;
10279 case NFT_MSG_DELTABLE:
10280 case NFT_MSG_DESTROYTABLE:
10281 list_del_rcu(&trans->ctx.table->list);
10282 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10283 break;
10284 case NFT_MSG_NEWCHAIN:
10285 if (nft_trans_chain_update(trans)) {
10286 nft_chain_commit_update(trans);
10287 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10288 &nft_trans_chain_hooks(trans));
10289 list_splice(&nft_trans_chain_hooks(trans),
10290 &nft_trans_basechain(trans)->hook_list);
10291 /* trans destroyed after rcu grace period */
10292 } else {
10293 nft_chain_commit_drop_policy(trans);
10294 nft_clear(net, trans->ctx.chain);
10295 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10296 nft_trans_destroy(trans);
10297 }
10298 break;
10299 case NFT_MSG_DELCHAIN:
10300 case NFT_MSG_DESTROYCHAIN:
10301 if (nft_trans_chain_update(trans)) {
10302 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10303 &nft_trans_chain_hooks(trans));
10304 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10305 nft_netdev_unregister_hooks(net,
10306 &nft_trans_chain_hooks(trans),
10307 true);
10308 }
10309 } else {
10310 nft_chain_del(trans->ctx.chain);
10311 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10312 NULL);
10313 nf_tables_unregister_hook(trans->ctx.net,
10314 trans->ctx.table,
10315 trans->ctx.chain);
10316 }
10317 break;
10318 case NFT_MSG_NEWRULE:
10319 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10320 nf_tables_rule_notify(&trans->ctx,
10321 nft_trans_rule(trans),
10322 NFT_MSG_NEWRULE);
10323 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10324 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10325
10326 nft_trans_destroy(trans);
10327 break;
10328 case NFT_MSG_DELRULE:
10329 case NFT_MSG_DESTROYRULE:
10330 list_del_rcu(&nft_trans_rule(trans)->list);
10331 nf_tables_rule_notify(&trans->ctx,
10332 nft_trans_rule(trans),
10333 trans->msg_type);
10334 nft_rule_expr_deactivate(&trans->ctx,
10335 nft_trans_rule(trans),
10336 NFT_TRANS_COMMIT);
10337
10338 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10339 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10340 break;
10341 case NFT_MSG_NEWSET:
10342 if (nft_trans_set_update(trans)) {
10343 struct nft_set *set = nft_trans_set(trans);
10344
10345 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10346 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10347
10348 if (nft_trans_set_size(trans))
10349 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10350 } else {
10351 nft_clear(net, nft_trans_set(trans));
10352 /* This avoids hitting -EBUSY when deleting the table
10353 * from the transaction.
10354 */
10355 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10356 !list_empty(&nft_trans_set(trans)->bindings))
10357 nft_use_dec(&trans->ctx.table->use);
10358 }
10359 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10360 NFT_MSG_NEWSET, GFP_KERNEL);
10361 nft_trans_destroy(trans);
10362 break;
10363 case NFT_MSG_DELSET:
10364 case NFT_MSG_DESTROYSET:
10365 nft_trans_set(trans)->dead = 1;
10366 list_del_rcu(&nft_trans_set(trans)->list);
10367 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10368 trans->msg_type, GFP_KERNEL);
10369 break;
10370 case NFT_MSG_NEWSETELEM:
10371 te = (struct nft_trans_elem *)trans->data;
10372
10373 nft_setelem_activate(net, te->set, &te->elem);
10374 nf_tables_setelem_notify(&trans->ctx, te->set,
10375 &te->elem,
10376 NFT_MSG_NEWSETELEM);
10377 if (te->set->ops->commit &&
10378 list_empty(&te->set->pending_update)) {
10379 list_add_tail(&te->set->pending_update,
10380 &set_update_list);
10381 }
10382 nft_trans_destroy(trans);
10383 break;
10384 case NFT_MSG_DELSETELEM:
10385 case NFT_MSG_DESTROYSETELEM:
10386 te = (struct nft_trans_elem *)trans->data;
10387
10388 nf_tables_setelem_notify(&trans->ctx, te->set,
10389 &te->elem,
10390 trans->msg_type);
10391 nft_setelem_remove(net, te->set, &te->elem);
10392 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10393 atomic_dec(&te->set->nelems);
10394 te->set->ndeact--;
10395 }
10396 if (te->set->ops->commit &&
10397 list_empty(&te->set->pending_update)) {
10398 list_add_tail(&te->set->pending_update,
10399 &set_update_list);
10400 }
10401 break;
10402 case NFT_MSG_NEWOBJ:
10403 if (nft_trans_obj_update(trans)) {
10404 nft_obj_commit_update(trans);
10405 nf_tables_obj_notify(&trans->ctx,
10406 nft_trans_obj(trans),
10407 NFT_MSG_NEWOBJ);
10408 } else {
10409 nft_clear(net, nft_trans_obj(trans));
10410 nf_tables_obj_notify(&trans->ctx,
10411 nft_trans_obj(trans),
10412 NFT_MSG_NEWOBJ);
10413 nft_trans_destroy(trans);
10414 }
10415 break;
10416 case NFT_MSG_DELOBJ:
10417 case NFT_MSG_DESTROYOBJ:
10418 nft_obj_del(nft_trans_obj(trans));
10419 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10420 trans->msg_type);
10421 break;
10422 case NFT_MSG_NEWFLOWTABLE:
10423 if (nft_trans_flowtable_update(trans)) {
10424 nft_trans_flowtable(trans)->data.flags =
10425 nft_trans_flowtable_flags(trans);
10426 nf_tables_flowtable_notify(&trans->ctx,
10427 nft_trans_flowtable(trans),
10428 &nft_trans_flowtable_hooks(trans),
10429 NFT_MSG_NEWFLOWTABLE);
10430 list_splice(&nft_trans_flowtable_hooks(trans),
10431 &nft_trans_flowtable(trans)->hook_list);
10432 } else {
10433 nft_clear(net, nft_trans_flowtable(trans));
10434 nf_tables_flowtable_notify(&trans->ctx,
10435 nft_trans_flowtable(trans),
10436 NULL,
10437 NFT_MSG_NEWFLOWTABLE);
10438 }
10439 nft_trans_destroy(trans);
10440 break;
10441 case NFT_MSG_DELFLOWTABLE:
10442 case NFT_MSG_DESTROYFLOWTABLE:
10443 if (nft_trans_flowtable_update(trans)) {
10444 nf_tables_flowtable_notify(&trans->ctx,
10445 nft_trans_flowtable(trans),
10446 &nft_trans_flowtable_hooks(trans),
10447 trans->msg_type);
10448 nft_unregister_flowtable_net_hooks(net,
10449 nft_trans_flowtable(trans),
10450 &nft_trans_flowtable_hooks(trans));
10451 } else {
10452 list_del_rcu(&nft_trans_flowtable(trans)->list);
10453 nf_tables_flowtable_notify(&trans->ctx,
10454 nft_trans_flowtable(trans),
10455 NULL,
10456 trans->msg_type);
10457 nft_unregister_flowtable_net_hooks(net,
10458 nft_trans_flowtable(trans),
10459 &nft_trans_flowtable(trans)->hook_list);
10460 }
10461 break;
10462 }
10463 }
10464
10465 nft_set_commit_update(&set_update_list);
10466
10467 nft_commit_notify(net, NETLINK_CB(skb).portid);
10468 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10469 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10470
10471 nft_gc_seq_end(nft_net, gc_seq);
10472 nft_net->validate_state = NFT_VALIDATE_SKIP;
10473 nf_tables_commit_release(net);
10474
10475 return 0;
10476 }
10477
nf_tables_module_autoload(struct net * net)10478 static void nf_tables_module_autoload(struct net *net)
10479 {
10480 struct nftables_pernet *nft_net = nft_pernet(net);
10481 struct nft_module_request *req, *next;
10482 LIST_HEAD(module_list);
10483
10484 list_splice_init(&nft_net->module_list, &module_list);
10485 mutex_unlock(&nft_net->commit_mutex);
10486 list_for_each_entry_safe(req, next, &module_list, list) {
10487 request_module("%s", req->module);
10488 req->done = true;
10489 }
10490 mutex_lock(&nft_net->commit_mutex);
10491 list_splice(&module_list, &nft_net->module_list);
10492 }
10493
nf_tables_abort_release(struct nft_trans * trans)10494 static void nf_tables_abort_release(struct nft_trans *trans)
10495 {
10496 switch (trans->msg_type) {
10497 case NFT_MSG_NEWTABLE:
10498 nf_tables_table_destroy(&trans->ctx);
10499 break;
10500 case NFT_MSG_NEWCHAIN:
10501 if (nft_trans_chain_update(trans))
10502 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10503 else
10504 nf_tables_chain_destroy(nft_trans_chain(trans));
10505 break;
10506 case NFT_MSG_NEWRULE:
10507 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10508 break;
10509 case NFT_MSG_NEWSET:
10510 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10511 break;
10512 case NFT_MSG_NEWSETELEM:
10513 nft_set_elem_destroy(nft_trans_elem_set(trans),
10514 nft_trans_elem(trans).priv, true);
10515 break;
10516 case NFT_MSG_NEWOBJ:
10517 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10518 break;
10519 case NFT_MSG_NEWFLOWTABLE:
10520 if (nft_trans_flowtable_update(trans))
10521 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10522 else
10523 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10524 break;
10525 }
10526 kfree(trans);
10527 }
10528
nft_set_abort_update(struct list_head * set_update_list)10529 static void nft_set_abort_update(struct list_head *set_update_list)
10530 {
10531 struct nft_set *set, *next;
10532
10533 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10534 list_del_init(&set->pending_update);
10535
10536 if (!set->ops->abort)
10537 continue;
10538
10539 set->ops->abort(set);
10540 }
10541 }
10542
__nf_tables_abort(struct net * net,enum nfnl_abort_action action)10543 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10544 {
10545 struct nftables_pernet *nft_net = nft_pernet(net);
10546 struct nft_trans *trans, *next;
10547 LIST_HEAD(set_update_list);
10548 struct nft_trans_elem *te;
10549 int err = 0;
10550
10551 if (action == NFNL_ABORT_VALIDATE &&
10552 nf_tables_validate(net) < 0)
10553 err = -EAGAIN;
10554
10555 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10556 list) {
10557 switch (trans->msg_type) {
10558 case NFT_MSG_NEWTABLE:
10559 if (nft_trans_table_update(trans)) {
10560 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10561 nft_trans_destroy(trans);
10562 break;
10563 }
10564 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10565 nf_tables_table_disable(net, trans->ctx.table);
10566 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10567 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10568 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10569 }
10570 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10571 nft_trans_destroy(trans);
10572 } else {
10573 list_del_rcu(&trans->ctx.table->list);
10574 }
10575 break;
10576 case NFT_MSG_DELTABLE:
10577 case NFT_MSG_DESTROYTABLE:
10578 nft_clear(trans->ctx.net, trans->ctx.table);
10579 nft_trans_destroy(trans);
10580 break;
10581 case NFT_MSG_NEWCHAIN:
10582 if (nft_trans_chain_update(trans)) {
10583 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10584 nft_netdev_unregister_hooks(net,
10585 &nft_trans_chain_hooks(trans),
10586 true);
10587 }
10588 free_percpu(nft_trans_chain_stats(trans));
10589 kfree(nft_trans_chain_name(trans));
10590 nft_trans_destroy(trans);
10591 } else {
10592 if (nft_trans_chain_bound(trans)) {
10593 nft_trans_destroy(trans);
10594 break;
10595 }
10596 nft_use_dec_restore(&trans->ctx.table->use);
10597 nft_chain_del(trans->ctx.chain);
10598 nf_tables_unregister_hook(trans->ctx.net,
10599 trans->ctx.table,
10600 trans->ctx.chain);
10601 }
10602 break;
10603 case NFT_MSG_DELCHAIN:
10604 case NFT_MSG_DESTROYCHAIN:
10605 if (nft_trans_chain_update(trans)) {
10606 list_splice(&nft_trans_chain_hooks(trans),
10607 &nft_trans_basechain(trans)->hook_list);
10608 } else {
10609 nft_use_inc_restore(&trans->ctx.table->use);
10610 nft_clear(trans->ctx.net, trans->ctx.chain);
10611 }
10612 nft_trans_destroy(trans);
10613 break;
10614 case NFT_MSG_NEWRULE:
10615 if (nft_trans_rule_bound(trans)) {
10616 nft_trans_destroy(trans);
10617 break;
10618 }
10619 nft_use_dec_restore(&trans->ctx.chain->use);
10620 list_del_rcu(&nft_trans_rule(trans)->list);
10621 nft_rule_expr_deactivate(&trans->ctx,
10622 nft_trans_rule(trans),
10623 NFT_TRANS_ABORT);
10624 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10625 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10626 break;
10627 case NFT_MSG_DELRULE:
10628 case NFT_MSG_DESTROYRULE:
10629 nft_use_inc_restore(&trans->ctx.chain->use);
10630 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10631 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10632 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10633 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10634
10635 nft_trans_destroy(trans);
10636 break;
10637 case NFT_MSG_NEWSET:
10638 if (nft_trans_set_update(trans)) {
10639 nft_trans_destroy(trans);
10640 break;
10641 }
10642 nft_use_dec_restore(&trans->ctx.table->use);
10643 if (nft_trans_set_bound(trans)) {
10644 nft_trans_destroy(trans);
10645 break;
10646 }
10647 nft_trans_set(trans)->dead = 1;
10648 list_del_rcu(&nft_trans_set(trans)->list);
10649 break;
10650 case NFT_MSG_DELSET:
10651 case NFT_MSG_DESTROYSET:
10652 nft_use_inc_restore(&trans->ctx.table->use);
10653 nft_clear(trans->ctx.net, nft_trans_set(trans));
10654 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10655 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10656
10657 nft_trans_destroy(trans);
10658 break;
10659 case NFT_MSG_NEWSETELEM:
10660 if (nft_trans_elem_set_bound(trans)) {
10661 nft_trans_destroy(trans);
10662 break;
10663 }
10664 te = (struct nft_trans_elem *)trans->data;
10665 nft_setelem_remove(net, te->set, &te->elem);
10666 if (!nft_setelem_is_catchall(te->set, &te->elem))
10667 atomic_dec(&te->set->nelems);
10668
10669 if (te->set->ops->abort &&
10670 list_empty(&te->set->pending_update)) {
10671 list_add_tail(&te->set->pending_update,
10672 &set_update_list);
10673 }
10674 break;
10675 case NFT_MSG_DELSETELEM:
10676 case NFT_MSG_DESTROYSETELEM:
10677 te = (struct nft_trans_elem *)trans->data;
10678
10679 if (!nft_setelem_active_next(net, te->set, &te->elem)) {
10680 nft_setelem_data_activate(net, te->set, &te->elem);
10681 nft_setelem_activate(net, te->set, &te->elem);
10682 }
10683 if (!nft_setelem_is_catchall(te->set, &te->elem))
10684 te->set->ndeact--;
10685
10686 if (te->set->ops->abort &&
10687 list_empty(&te->set->pending_update)) {
10688 list_add_tail(&te->set->pending_update,
10689 &set_update_list);
10690 }
10691 nft_trans_destroy(trans);
10692 break;
10693 case NFT_MSG_NEWOBJ:
10694 if (nft_trans_obj_update(trans)) {
10695 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10696 nft_trans_destroy(trans);
10697 } else {
10698 nft_use_dec_restore(&trans->ctx.table->use);
10699 nft_obj_del(nft_trans_obj(trans));
10700 }
10701 break;
10702 case NFT_MSG_DELOBJ:
10703 case NFT_MSG_DESTROYOBJ:
10704 nft_use_inc_restore(&trans->ctx.table->use);
10705 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10706 nft_trans_destroy(trans);
10707 break;
10708 case NFT_MSG_NEWFLOWTABLE:
10709 if (nft_trans_flowtable_update(trans)) {
10710 nft_unregister_flowtable_net_hooks(net,
10711 nft_trans_flowtable(trans),
10712 &nft_trans_flowtable_hooks(trans));
10713 } else {
10714 nft_use_dec_restore(&trans->ctx.table->use);
10715 list_del_rcu(&nft_trans_flowtable(trans)->list);
10716 nft_unregister_flowtable_net_hooks(net,
10717 nft_trans_flowtable(trans),
10718 &nft_trans_flowtable(trans)->hook_list);
10719 }
10720 break;
10721 case NFT_MSG_DELFLOWTABLE:
10722 case NFT_MSG_DESTROYFLOWTABLE:
10723 if (nft_trans_flowtable_update(trans)) {
10724 list_splice(&nft_trans_flowtable_hooks(trans),
10725 &nft_trans_flowtable(trans)->hook_list);
10726 } else {
10727 nft_use_inc_restore(&trans->ctx.table->use);
10728 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10729 }
10730 nft_trans_destroy(trans);
10731 break;
10732 }
10733 }
10734
10735 nft_set_abort_update(&set_update_list);
10736
10737 synchronize_rcu();
10738
10739 list_for_each_entry_safe_reverse(trans, next,
10740 &nft_net->commit_list, list) {
10741 nft_trans_list_del(trans);
10742 nf_tables_abort_release(trans);
10743 }
10744
10745 return err;
10746 }
10747
nf_tables_abort(struct net * net,struct sk_buff * skb,enum nfnl_abort_action action)10748 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10749 enum nfnl_abort_action action)
10750 {
10751 struct nftables_pernet *nft_net = nft_pernet(net);
10752 unsigned int gc_seq;
10753 int ret;
10754
10755 gc_seq = nft_gc_seq_begin(nft_net);
10756 ret = __nf_tables_abort(net, action);
10757 nft_gc_seq_end(nft_net, gc_seq);
10758
10759 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10760
10761 /* module autoload needs to happen after GC sequence update because it
10762 * temporarily releases and grabs mutex again.
10763 */
10764 if (action == NFNL_ABORT_AUTOLOAD)
10765 nf_tables_module_autoload(net);
10766 else
10767 nf_tables_module_autoload_cleanup(net);
10768
10769 mutex_unlock(&nft_net->commit_mutex);
10770
10771 return ret;
10772 }
10773
nf_tables_valid_genid(struct net * net,u32 genid)10774 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10775 {
10776 struct nftables_pernet *nft_net = nft_pernet(net);
10777 bool genid_ok;
10778
10779 mutex_lock(&nft_net->commit_mutex);
10780 nft_net->tstamp = get_jiffies_64();
10781
10782 genid_ok = genid == 0 || nft_net->base_seq == genid;
10783 if (!genid_ok)
10784 mutex_unlock(&nft_net->commit_mutex);
10785
10786 /* else, commit mutex has to be released by commit or abort function */
10787 return genid_ok;
10788 }
10789
10790 static const struct nfnetlink_subsystem nf_tables_subsys = {
10791 .name = "nf_tables",
10792 .subsys_id = NFNL_SUBSYS_NFTABLES,
10793 .cb_count = NFT_MSG_MAX,
10794 .cb = nf_tables_cb,
10795 .commit = nf_tables_commit,
10796 .abort = nf_tables_abort,
10797 .valid_genid = nf_tables_valid_genid,
10798 .owner = THIS_MODULE,
10799 };
10800
nft_chain_validate_dependency(const struct nft_chain * chain,enum nft_chain_types type)10801 int nft_chain_validate_dependency(const struct nft_chain *chain,
10802 enum nft_chain_types type)
10803 {
10804 const struct nft_base_chain *basechain;
10805
10806 if (nft_is_base_chain(chain)) {
10807 basechain = nft_base_chain(chain);
10808 if (basechain->type->type != type)
10809 return -EOPNOTSUPP;
10810 }
10811 return 0;
10812 }
10813 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10814
nft_chain_validate_hooks(const struct nft_chain * chain,unsigned int hook_flags)10815 int nft_chain_validate_hooks(const struct nft_chain *chain,
10816 unsigned int hook_flags)
10817 {
10818 struct nft_base_chain *basechain;
10819
10820 if (nft_is_base_chain(chain)) {
10821 basechain = nft_base_chain(chain);
10822
10823 if ((1 << basechain->ops.hooknum) & hook_flags)
10824 return 0;
10825
10826 return -EOPNOTSUPP;
10827 }
10828
10829 return 0;
10830 }
10831 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10832
10833 /**
10834 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10835 *
10836 * @attr: netlink attribute to fetch value from
10837 * @max: maximum value to be stored in dest
10838 * @dest: pointer to the variable
10839 *
10840 * Parse, check and store a given u32 netlink attribute into variable.
10841 * This function returns -ERANGE if the value goes over maximum value.
10842 * Otherwise a 0 is returned and the attribute value is stored in the
10843 * destination variable.
10844 */
nft_parse_u32_check(const struct nlattr * attr,int max,u32 * dest)10845 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10846 {
10847 u32 val;
10848
10849 val = ntohl(nla_get_be32(attr));
10850 if (val > max)
10851 return -ERANGE;
10852
10853 *dest = val;
10854 return 0;
10855 }
10856 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10857
nft_parse_register(const struct nlattr * attr,u32 * preg)10858 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10859 {
10860 unsigned int reg;
10861
10862 reg = ntohl(nla_get_be32(attr));
10863 switch (reg) {
10864 case NFT_REG_VERDICT...NFT_REG_4:
10865 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10866 break;
10867 case NFT_REG32_00...NFT_REG32_15:
10868 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10869 break;
10870 default:
10871 return -ERANGE;
10872 }
10873
10874 return 0;
10875 }
10876
10877 /**
10878 * nft_dump_register - dump a register value to a netlink attribute
10879 *
10880 * @skb: socket buffer
10881 * @attr: attribute number
10882 * @reg: register number
10883 *
10884 * Construct a netlink attribute containing the register number. For
10885 * compatibility reasons, register numbers being a multiple of 4 are
10886 * translated to the corresponding 128 bit register numbers.
10887 */
nft_dump_register(struct sk_buff * skb,unsigned int attr,unsigned int reg)10888 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10889 {
10890 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10891 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10892 else
10893 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10894
10895 return nla_put_be32(skb, attr, htonl(reg));
10896 }
10897 EXPORT_SYMBOL_GPL(nft_dump_register);
10898
nft_validate_register_load(enum nft_registers reg,unsigned int len)10899 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10900 {
10901 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10902 return -EINVAL;
10903 if (len == 0)
10904 return -EINVAL;
10905 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10906 return -ERANGE;
10907
10908 return 0;
10909 }
10910
nft_parse_register_load(const struct nlattr * attr,u8 * sreg,u32 len)10911 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10912 {
10913 u32 reg;
10914 int err;
10915
10916 err = nft_parse_register(attr, ®);
10917 if (err < 0)
10918 return err;
10919
10920 err = nft_validate_register_load(reg, len);
10921 if (err < 0)
10922 return err;
10923
10924 *sreg = reg;
10925 return 0;
10926 }
10927 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10928
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)10929 static int nft_validate_register_store(const struct nft_ctx *ctx,
10930 enum nft_registers reg,
10931 const struct nft_data *data,
10932 enum nft_data_types type,
10933 unsigned int len)
10934 {
10935 int err;
10936
10937 switch (reg) {
10938 case NFT_REG_VERDICT:
10939 if (type != NFT_DATA_VERDICT)
10940 return -EINVAL;
10941
10942 if (data != NULL &&
10943 (data->verdict.code == NFT_GOTO ||
10944 data->verdict.code == NFT_JUMP)) {
10945 err = nft_chain_validate(ctx, data->verdict.chain);
10946 if (err < 0)
10947 return err;
10948 }
10949
10950 return 0;
10951 default:
10952 if (type != NFT_DATA_VALUE)
10953 return -EINVAL;
10954
10955 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10956 return -EINVAL;
10957 if (len == 0)
10958 return -EINVAL;
10959 if (reg * NFT_REG32_SIZE + len >
10960 sizeof_field(struct nft_regs, data))
10961 return -ERANGE;
10962
10963 return 0;
10964 }
10965 }
10966
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)10967 int nft_parse_register_store(const struct nft_ctx *ctx,
10968 const struct nlattr *attr, u8 *dreg,
10969 const struct nft_data *data,
10970 enum nft_data_types type, unsigned int len)
10971 {
10972 int err;
10973 u32 reg;
10974
10975 err = nft_parse_register(attr, ®);
10976 if (err < 0)
10977 return err;
10978
10979 err = nft_validate_register_store(ctx, reg, data, type, len);
10980 if (err < 0)
10981 return err;
10982
10983 *dreg = reg;
10984 return 0;
10985 }
10986 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10987
10988 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10989 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10990 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10991 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10992 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10993 };
10994
nft_verdict_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)10995 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10996 struct nft_data_desc *desc, const struct nlattr *nla)
10997 {
10998 u8 genmask = nft_genmask_next(ctx->net);
10999 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11000 struct nft_chain *chain;
11001 int err;
11002
11003 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11004 nft_verdict_policy, NULL);
11005 if (err < 0)
11006 return err;
11007
11008 if (!tb[NFTA_VERDICT_CODE])
11009 return -EINVAL;
11010
11011 /* zero padding hole for memcmp */
11012 memset(data, 0, sizeof(*data));
11013 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11014
11015 switch (data->verdict.code) {
11016 case NF_ACCEPT:
11017 case NF_DROP:
11018 case NF_QUEUE:
11019 break;
11020 case NFT_CONTINUE:
11021 case NFT_BREAK:
11022 case NFT_RETURN:
11023 break;
11024 case NFT_JUMP:
11025 case NFT_GOTO:
11026 if (tb[NFTA_VERDICT_CHAIN]) {
11027 chain = nft_chain_lookup(ctx->net, ctx->table,
11028 tb[NFTA_VERDICT_CHAIN],
11029 genmask);
11030 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11031 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11032 tb[NFTA_VERDICT_CHAIN_ID],
11033 genmask);
11034 if (IS_ERR(chain))
11035 return PTR_ERR(chain);
11036 } else {
11037 return -EINVAL;
11038 }
11039
11040 if (IS_ERR(chain))
11041 return PTR_ERR(chain);
11042 if (nft_is_base_chain(chain))
11043 return -EOPNOTSUPP;
11044 if (nft_chain_is_bound(chain))
11045 return -EINVAL;
11046 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11047 chain->flags & NFT_CHAIN_BINDING)
11048 return -EINVAL;
11049 if (!nft_use_inc(&chain->use))
11050 return -EMFILE;
11051
11052 data->verdict.chain = chain;
11053 break;
11054 default:
11055 return -EINVAL;
11056 }
11057
11058 desc->len = sizeof(data->verdict);
11059
11060 return 0;
11061 }
11062
nft_verdict_uninit(const struct nft_data * data)11063 static void nft_verdict_uninit(const struct nft_data *data)
11064 {
11065 struct nft_chain *chain;
11066
11067 switch (data->verdict.code) {
11068 case NFT_JUMP:
11069 case NFT_GOTO:
11070 chain = data->verdict.chain;
11071 nft_use_dec(&chain->use);
11072 break;
11073 }
11074 }
11075
nft_verdict_dump(struct sk_buff * skb,int type,const struct nft_verdict * v)11076 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11077 {
11078 struct nlattr *nest;
11079
11080 nest = nla_nest_start_noflag(skb, type);
11081 if (!nest)
11082 goto nla_put_failure;
11083
11084 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11085 goto nla_put_failure;
11086
11087 switch (v->code) {
11088 case NFT_JUMP:
11089 case NFT_GOTO:
11090 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11091 v->chain->name))
11092 goto nla_put_failure;
11093 }
11094 nla_nest_end(skb, nest);
11095 return 0;
11096
11097 nla_put_failure:
11098 return -1;
11099 }
11100
nft_value_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)11101 static int nft_value_init(const struct nft_ctx *ctx,
11102 struct nft_data *data, struct nft_data_desc *desc,
11103 const struct nlattr *nla)
11104 {
11105 unsigned int len;
11106
11107 len = nla_len(nla);
11108 if (len == 0)
11109 return -EINVAL;
11110 if (len > desc->size)
11111 return -EOVERFLOW;
11112 if (desc->len) {
11113 if (len != desc->len)
11114 return -EINVAL;
11115 } else {
11116 desc->len = len;
11117 }
11118
11119 nla_memcpy(data->data, nla, len);
11120
11121 return 0;
11122 }
11123
nft_value_dump(struct sk_buff * skb,const struct nft_data * data,unsigned int len)11124 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11125 unsigned int len)
11126 {
11127 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11128 }
11129
11130 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11131 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
11132 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
11133 };
11134
11135 /**
11136 * nft_data_init - parse nf_tables data netlink attributes
11137 *
11138 * @ctx: context of the expression using the data
11139 * @data: destination struct nft_data
11140 * @desc: data description
11141 * @nla: netlink attribute containing data
11142 *
11143 * Parse the netlink data attributes and initialize a struct nft_data.
11144 * The type and length of data are returned in the data description.
11145 *
11146 * The caller can indicate that it only wants to accept data of type
11147 * NFT_DATA_VALUE by passing NULL for the ctx argument.
11148 */
nft_data_init(const struct nft_ctx * ctx,struct nft_data * data,struct nft_data_desc * desc,const struct nlattr * nla)11149 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11150 struct nft_data_desc *desc, const struct nlattr *nla)
11151 {
11152 struct nlattr *tb[NFTA_DATA_MAX + 1];
11153 int err;
11154
11155 if (WARN_ON_ONCE(!desc->size))
11156 return -EINVAL;
11157
11158 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11159 nft_data_policy, NULL);
11160 if (err < 0)
11161 return err;
11162
11163 if (tb[NFTA_DATA_VALUE]) {
11164 if (desc->type != NFT_DATA_VALUE)
11165 return -EINVAL;
11166
11167 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11168 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11169 if (desc->type != NFT_DATA_VERDICT)
11170 return -EINVAL;
11171
11172 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11173 } else {
11174 err = -EINVAL;
11175 }
11176
11177 return err;
11178 }
11179 EXPORT_SYMBOL_GPL(nft_data_init);
11180
11181 /**
11182 * nft_data_release - release a nft_data item
11183 *
11184 * @data: struct nft_data to release
11185 * @type: type of data
11186 *
11187 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11188 * all others need to be released by calling this function.
11189 */
nft_data_release(const struct nft_data * data,enum nft_data_types type)11190 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11191 {
11192 if (type < NFT_DATA_VERDICT)
11193 return;
11194 switch (type) {
11195 case NFT_DATA_VERDICT:
11196 return nft_verdict_uninit(data);
11197 default:
11198 WARN_ON(1);
11199 }
11200 }
11201 EXPORT_SYMBOL_GPL(nft_data_release);
11202
nft_data_dump(struct sk_buff * skb,int attr,const struct nft_data * data,enum nft_data_types type,unsigned int len)11203 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11204 enum nft_data_types type, unsigned int len)
11205 {
11206 struct nlattr *nest;
11207 int err;
11208
11209 nest = nla_nest_start_noflag(skb, attr);
11210 if (nest == NULL)
11211 return -1;
11212
11213 switch (type) {
11214 case NFT_DATA_VALUE:
11215 err = nft_value_dump(skb, data, len);
11216 break;
11217 case NFT_DATA_VERDICT:
11218 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11219 break;
11220 default:
11221 err = -EINVAL;
11222 WARN_ON(1);
11223 }
11224
11225 nla_nest_end(skb, nest);
11226 return err;
11227 }
11228 EXPORT_SYMBOL_GPL(nft_data_dump);
11229
__nft_release_basechain_now(struct nft_ctx * ctx)11230 static void __nft_release_basechain_now(struct nft_ctx *ctx)
11231 {
11232 struct nft_rule *rule, *nr;
11233
11234 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11235 list_del(&rule->list);
11236 nf_tables_rule_release(ctx, rule);
11237 }
11238 nf_tables_chain_destroy(ctx->chain);
11239 }
11240
__nft_release_basechain(struct nft_ctx * ctx)11241 int __nft_release_basechain(struct nft_ctx *ctx)
11242 {
11243 struct nft_rule *rule;
11244
11245 if (WARN_ON_ONCE(!nft_is_base_chain(ctx->chain)))
11246 return 0;
11247
11248 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11249 list_for_each_entry(rule, &ctx->chain->rules, list)
11250 nft_use_dec(&ctx->chain->use);
11251
11252 nft_chain_del(ctx->chain);
11253 nft_use_dec(&ctx->table->use);
11254
11255 if (!maybe_get_net(ctx->net)) {
11256 __nft_release_basechain_now(ctx);
11257 return 0;
11258 }
11259
11260 /* wait for ruleset dumps to complete. Owning chain is no longer in
11261 * lists, so new dumps can't find any of these rules anymore.
11262 */
11263 synchronize_rcu();
11264
11265 __nft_release_basechain_now(ctx);
11266 put_net(ctx->net);
11267 return 0;
11268 }
11269 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11270
__nft_release_hook(struct net * net,struct nft_table * table)11271 static void __nft_release_hook(struct net *net, struct nft_table *table)
11272 {
11273 struct nft_flowtable *flowtable;
11274 struct nft_chain *chain;
11275
11276 list_for_each_entry(chain, &table->chains, list)
11277 __nf_tables_unregister_hook(net, table, chain, true);
11278 list_for_each_entry(flowtable, &table->flowtables, list)
11279 __nft_unregister_flowtable_net_hooks(net, flowtable,
11280 &flowtable->hook_list,
11281 true);
11282 }
11283
__nft_release_hooks(struct net * net)11284 static void __nft_release_hooks(struct net *net)
11285 {
11286 struct nftables_pernet *nft_net = nft_pernet(net);
11287 struct nft_table *table;
11288
11289 list_for_each_entry(table, &nft_net->tables, list) {
11290 if (nft_table_has_owner(table))
11291 continue;
11292
11293 __nft_release_hook(net, table);
11294 }
11295 }
11296
__nft_release_table(struct net * net,struct nft_table * table)11297 static void __nft_release_table(struct net *net, struct nft_table *table)
11298 {
11299 struct nft_flowtable *flowtable, *nf;
11300 struct nft_chain *chain, *nc;
11301 struct nft_object *obj, *ne;
11302 struct nft_rule *rule, *nr;
11303 struct nft_set *set, *ns;
11304 struct nft_ctx ctx = {
11305 .net = net,
11306 .family = NFPROTO_NETDEV,
11307 };
11308
11309 ctx.family = table->family;
11310 ctx.table = table;
11311 list_for_each_entry(chain, &table->chains, list) {
11312 if (nft_chain_binding(chain))
11313 continue;
11314
11315 ctx.chain = chain;
11316 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11317 list_del(&rule->list);
11318 nft_use_dec(&chain->use);
11319 nf_tables_rule_release(&ctx, rule);
11320 }
11321 }
11322 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11323 list_del(&flowtable->list);
11324 nft_use_dec(&table->use);
11325 nf_tables_flowtable_destroy(flowtable);
11326 }
11327 list_for_each_entry_safe(set, ns, &table->sets, list) {
11328 list_del(&set->list);
11329 nft_use_dec(&table->use);
11330 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11331 nft_map_deactivate(&ctx, set);
11332
11333 nft_set_destroy(&ctx, set);
11334 }
11335 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11336 nft_obj_del(obj);
11337 nft_use_dec(&table->use);
11338 nft_obj_destroy(&ctx, obj);
11339 }
11340 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11341 nft_chain_del(chain);
11342 nft_use_dec(&table->use);
11343 nf_tables_chain_destroy(chain);
11344 }
11345 nf_tables_table_destroy(&ctx);
11346 }
11347
__nft_release_tables(struct net * net)11348 static void __nft_release_tables(struct net *net)
11349 {
11350 struct nftables_pernet *nft_net = nft_pernet(net);
11351 struct nft_table *table, *nt;
11352
11353 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11354 if (nft_table_has_owner(table))
11355 continue;
11356
11357 list_del(&table->list);
11358
11359 __nft_release_table(net, table);
11360 }
11361 }
11362
nft_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)11363 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11364 void *ptr)
11365 {
11366 struct nft_table *table, *to_delete[8];
11367 struct nftables_pernet *nft_net;
11368 struct netlink_notify *n = ptr;
11369 struct net *net = n->net;
11370 unsigned int deleted;
11371 bool restart = false;
11372 unsigned int gc_seq;
11373
11374 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11375 return NOTIFY_DONE;
11376
11377 nft_net = nft_pernet(net);
11378 deleted = 0;
11379 mutex_lock(&nft_net->commit_mutex);
11380
11381 gc_seq = nft_gc_seq_begin(nft_net);
11382
11383 nf_tables_trans_destroy_flush_work();
11384 again:
11385 list_for_each_entry(table, &nft_net->tables, list) {
11386 if (nft_table_has_owner(table) &&
11387 n->portid == table->nlpid) {
11388 __nft_release_hook(net, table);
11389 list_del_rcu(&table->list);
11390 to_delete[deleted++] = table;
11391 if (deleted >= ARRAY_SIZE(to_delete))
11392 break;
11393 }
11394 }
11395 if (deleted) {
11396 restart = deleted >= ARRAY_SIZE(to_delete);
11397 synchronize_rcu();
11398 while (deleted)
11399 __nft_release_table(net, to_delete[--deleted]);
11400
11401 if (restart)
11402 goto again;
11403 }
11404 nft_gc_seq_end(nft_net, gc_seq);
11405
11406 mutex_unlock(&nft_net->commit_mutex);
11407
11408 return NOTIFY_DONE;
11409 }
11410
11411 static struct notifier_block nft_nl_notifier = {
11412 .notifier_call = nft_rcv_nl_event,
11413 };
11414
nf_tables_init_net(struct net * net)11415 static int __net_init nf_tables_init_net(struct net *net)
11416 {
11417 struct nftables_pernet *nft_net = nft_pernet(net);
11418
11419 INIT_LIST_HEAD(&nft_net->tables);
11420 INIT_LIST_HEAD(&nft_net->commit_list);
11421 INIT_LIST_HEAD(&nft_net->binding_list);
11422 INIT_LIST_HEAD(&nft_net->module_list);
11423 INIT_LIST_HEAD(&nft_net->notify_list);
11424 mutex_init(&nft_net->commit_mutex);
11425 nft_net->base_seq = 1;
11426 nft_net->gc_seq = 0;
11427 nft_net->validate_state = NFT_VALIDATE_SKIP;
11428
11429 return 0;
11430 }
11431
nf_tables_pre_exit_net(struct net * net)11432 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11433 {
11434 struct nftables_pernet *nft_net = nft_pernet(net);
11435
11436 mutex_lock(&nft_net->commit_mutex);
11437 __nft_release_hooks(net);
11438 mutex_unlock(&nft_net->commit_mutex);
11439 }
11440
nf_tables_exit_net(struct net * net)11441 static void __net_exit nf_tables_exit_net(struct net *net)
11442 {
11443 struct nftables_pernet *nft_net = nft_pernet(net);
11444 unsigned int gc_seq;
11445
11446 mutex_lock(&nft_net->commit_mutex);
11447
11448 gc_seq = nft_gc_seq_begin(nft_net);
11449
11450 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11451
11452 if (!list_empty(&nft_net->module_list))
11453 nf_tables_module_autoload_cleanup(net);
11454
11455 __nft_release_tables(net);
11456
11457 nft_gc_seq_end(nft_net, gc_seq);
11458
11459 mutex_unlock(&nft_net->commit_mutex);
11460 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11461 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11462 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11463 }
11464
nf_tables_exit_batch(struct list_head * net_exit_list)11465 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11466 {
11467 flush_work(&trans_gc_work);
11468 }
11469
11470 static struct pernet_operations nf_tables_net_ops = {
11471 .init = nf_tables_init_net,
11472 .pre_exit = nf_tables_pre_exit_net,
11473 .exit = nf_tables_exit_net,
11474 .exit_batch = nf_tables_exit_batch,
11475 .id = &nf_tables_net_id,
11476 .size = sizeof(struct nftables_pernet),
11477 };
11478
nf_tables_module_init(void)11479 static int __init nf_tables_module_init(void)
11480 {
11481 int err;
11482
11483 err = register_pernet_subsys(&nf_tables_net_ops);
11484 if (err < 0)
11485 return err;
11486
11487 err = nft_chain_filter_init();
11488 if (err < 0)
11489 goto err_chain_filter;
11490
11491 err = nf_tables_core_module_init();
11492 if (err < 0)
11493 goto err_core_module;
11494
11495 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11496 if (err < 0)
11497 goto err_netdev_notifier;
11498
11499 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11500 if (err < 0)
11501 goto err_rht_objname;
11502
11503 err = nft_offload_init();
11504 if (err < 0)
11505 goto err_offload;
11506
11507 err = netlink_register_notifier(&nft_nl_notifier);
11508 if (err < 0)
11509 goto err_netlink_notifier;
11510
11511 /* must be last */
11512 err = nfnetlink_subsys_register(&nf_tables_subsys);
11513 if (err < 0)
11514 goto err_nfnl_subsys;
11515
11516 nft_chain_route_init();
11517
11518 return err;
11519
11520 err_nfnl_subsys:
11521 netlink_unregister_notifier(&nft_nl_notifier);
11522 err_netlink_notifier:
11523 nft_offload_exit();
11524 err_offload:
11525 rhltable_destroy(&nft_objname_ht);
11526 err_rht_objname:
11527 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11528 err_netdev_notifier:
11529 nf_tables_core_module_exit();
11530 err_core_module:
11531 nft_chain_filter_fini();
11532 err_chain_filter:
11533 unregister_pernet_subsys(&nf_tables_net_ops);
11534 return err;
11535 }
11536
nf_tables_module_exit(void)11537 static void __exit nf_tables_module_exit(void)
11538 {
11539 nfnetlink_subsys_unregister(&nf_tables_subsys);
11540 netlink_unregister_notifier(&nft_nl_notifier);
11541 nft_offload_exit();
11542 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11543 nft_chain_filter_fini();
11544 nft_chain_route_fini();
11545 nf_tables_trans_destroy_flush_work();
11546 unregister_pernet_subsys(&nf_tables_net_ops);
11547 cancel_work_sync(&trans_gc_work);
11548 cancel_work_sync(&trans_destroy_work);
11549 rcu_barrier();
11550 rhltable_destroy(&nft_objname_ht);
11551 nf_tables_core_module_exit();
11552 }
11553
11554 module_init(nf_tables_module_init);
11555 module_exit(nf_tables_module_exit);
11556
11557 MODULE_LICENSE("GPL");
11558 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11559 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
11560