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netfilter: nf_tables: add flow table netlink frontend
[mirror_ubuntu-jammy-kernel.git] / net / netfilter / nf_tables_api.c
1 /*
2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/vmalloc.h>
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nfnetlink.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <net/netfilter/nf_flow_table.h>
21 #include <net/netfilter/nf_tables_core.h>
22 #include <net/netfilter/nf_tables.h>
23 #include <net/net_namespace.h>
24 #include <net/sock.h>
25
26 static LIST_HEAD(nf_tables_expressions);
27 static LIST_HEAD(nf_tables_objects);
28 static LIST_HEAD(nf_tables_flowtables);
29
30 /**
31 * nft_register_afinfo - register nf_tables address family info
32 *
33 * @afi: address family info to register
34 *
35 * Register the address family for use with nf_tables. Returns zero on
36 * success or a negative errno code otherwise.
37 */
38 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
39 {
40 INIT_LIST_HEAD(&afi->tables);
41 nfnl_lock(NFNL_SUBSYS_NFTABLES);
42 list_add_tail_rcu(&afi->list, &net->nft.af_info);
43 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
44 return 0;
45 }
46 EXPORT_SYMBOL_GPL(nft_register_afinfo);
47
48 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi);
49
50 /**
51 * nft_unregister_afinfo - unregister nf_tables address family info
52 *
53 * @afi: address family info to unregister
54 *
55 * Unregister the address family for use with nf_tables.
56 */
57 void nft_unregister_afinfo(struct net *net, struct nft_af_info *afi)
58 {
59 nfnl_lock(NFNL_SUBSYS_NFTABLES);
60 __nft_release_afinfo(net, afi);
61 list_del_rcu(&afi->list);
62 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
63 }
64 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
65
66 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
67 {
68 struct nft_af_info *afi;
69
70 list_for_each_entry(afi, &net->nft.af_info, list) {
71 if (afi->family == family)
72 return afi;
73 }
74 return NULL;
75 }
76
77 static struct nft_af_info *
78 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
79 {
80 struct nft_af_info *afi;
81
82 afi = nft_afinfo_lookup(net, family);
83 if (afi != NULL)
84 return afi;
85 #ifdef CONFIG_MODULES
86 if (autoload) {
87 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
88 request_module("nft-afinfo-%u", family);
89 nfnl_lock(NFNL_SUBSYS_NFTABLES);
90 afi = nft_afinfo_lookup(net, family);
91 if (afi != NULL)
92 return ERR_PTR(-EAGAIN);
93 }
94 #endif
95 return ERR_PTR(-EAFNOSUPPORT);
96 }
97
98 static void nft_ctx_init(struct nft_ctx *ctx,
99 struct net *net,
100 const struct sk_buff *skb,
101 const struct nlmsghdr *nlh,
102 struct nft_af_info *afi,
103 struct nft_table *table,
104 struct nft_chain *chain,
105 const struct nlattr * const *nla)
106 {
107 ctx->net = net;
108 ctx->afi = afi;
109 ctx->table = table;
110 ctx->chain = chain;
111 ctx->nla = nla;
112 ctx->portid = NETLINK_CB(skb).portid;
113 ctx->report = nlmsg_report(nlh);
114 ctx->seq = nlh->nlmsg_seq;
115 }
116
117 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
118 int msg_type, u32 size, gfp_t gfp)
119 {
120 struct nft_trans *trans;
121
122 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
123 if (trans == NULL)
124 return NULL;
125
126 trans->msg_type = msg_type;
127 trans->ctx = *ctx;
128
129 return trans;
130 }
131
132 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
133 int msg_type, u32 size)
134 {
135 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
136 }
137
138 static void nft_trans_destroy(struct nft_trans *trans)
139 {
140 list_del(&trans->list);
141 kfree(trans);
142 }
143
144 static int nf_tables_register_hook(struct net *net,
145 const struct nft_table *table,
146 struct nft_chain *chain)
147 {
148 if (table->flags & NFT_TABLE_F_DORMANT ||
149 !nft_is_base_chain(chain))
150 return 0;
151
152 return nf_register_net_hook(net, &nft_base_chain(chain)->ops);
153 }
154
155 static void nf_tables_unregister_hook(struct net *net,
156 const struct nft_table *table,
157 struct nft_chain *chain)
158 {
159 if (table->flags & NFT_TABLE_F_DORMANT ||
160 !nft_is_base_chain(chain))
161 return;
162
163 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
164 }
165
166 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
167 {
168 struct nft_trans *trans;
169
170 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
171 if (trans == NULL)
172 return -ENOMEM;
173
174 if (msg_type == NFT_MSG_NEWTABLE)
175 nft_activate_next(ctx->net, ctx->table);
176
177 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
178 return 0;
179 }
180
181 static int nft_deltable(struct nft_ctx *ctx)
182 {
183 int err;
184
185 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
186 if (err < 0)
187 return err;
188
189 nft_deactivate_next(ctx->net, ctx->table);
190 return err;
191 }
192
193 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
194 {
195 struct nft_trans *trans;
196
197 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
198 if (trans == NULL)
199 return -ENOMEM;
200
201 if (msg_type == NFT_MSG_NEWCHAIN)
202 nft_activate_next(ctx->net, ctx->chain);
203
204 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
205 return 0;
206 }
207
208 static int nft_delchain(struct nft_ctx *ctx)
209 {
210 int err;
211
212 err = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
213 if (err < 0)
214 return err;
215
216 ctx->table->use--;
217 nft_deactivate_next(ctx->net, ctx->chain);
218
219 return err;
220 }
221
222 static int
223 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
224 {
225 /* You cannot delete the same rule twice */
226 if (nft_is_active_next(ctx->net, rule)) {
227 nft_deactivate_next(ctx->net, rule);
228 ctx->chain->use--;
229 return 0;
230 }
231 return -ENOENT;
232 }
233
234 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
235 struct nft_rule *rule)
236 {
237 struct nft_trans *trans;
238
239 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
240 if (trans == NULL)
241 return NULL;
242
243 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
244 nft_trans_rule_id(trans) =
245 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
246 }
247 nft_trans_rule(trans) = rule;
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
249
250 return trans;
251 }
252
253 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
254 {
255 struct nft_trans *trans;
256 int err;
257
258 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
259 if (trans == NULL)
260 return -ENOMEM;
261
262 err = nf_tables_delrule_deactivate(ctx, rule);
263 if (err < 0) {
264 nft_trans_destroy(trans);
265 return err;
266 }
267
268 return 0;
269 }
270
271 static int nft_delrule_by_chain(struct nft_ctx *ctx)
272 {
273 struct nft_rule *rule;
274 int err;
275
276 list_for_each_entry(rule, &ctx->chain->rules, list) {
277 err = nft_delrule(ctx, rule);
278 if (err < 0)
279 return err;
280 }
281 return 0;
282 }
283
284 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
285 struct nft_set *set)
286 {
287 struct nft_trans *trans;
288
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
290 if (trans == NULL)
291 return -ENOMEM;
292
293 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
294 nft_trans_set_id(trans) =
295 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
296 nft_activate_next(ctx->net, set);
297 }
298 nft_trans_set(trans) = set;
299 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
300
301 return 0;
302 }
303
304 static int nft_delset(struct nft_ctx *ctx, struct nft_set *set)
305 {
306 int err;
307
308 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
309 if (err < 0)
310 return err;
311
312 nft_deactivate_next(ctx->net, set);
313 ctx->table->use--;
314
315 return err;
316 }
317
318 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
319 struct nft_object *obj)
320 {
321 struct nft_trans *trans;
322
323 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
324 if (trans == NULL)
325 return -ENOMEM;
326
327 if (msg_type == NFT_MSG_NEWOBJ)
328 nft_activate_next(ctx->net, obj);
329
330 nft_trans_obj(trans) = obj;
331 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
332
333 return 0;
334 }
335
336 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
337 {
338 int err;
339
340 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
341 if (err < 0)
342 return err;
343
344 nft_deactivate_next(ctx->net, obj);
345 ctx->table->use--;
346
347 return err;
348 }
349
350 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
351 struct nft_flowtable *flowtable)
352 {
353 struct nft_trans *trans;
354
355 trans = nft_trans_alloc(ctx, msg_type,
356 sizeof(struct nft_trans_flowtable));
357 if (trans == NULL)
358 return -ENOMEM;
359
360 if (msg_type == NFT_MSG_NEWFLOWTABLE)
361 nft_activate_next(ctx->net, flowtable);
362
363 nft_trans_flowtable(trans) = flowtable;
364 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
365
366 return 0;
367 }
368
369 static int nft_delflowtable(struct nft_ctx *ctx,
370 struct nft_flowtable *flowtable)
371 {
372 int err;
373
374 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
375 if (err < 0)
376 return err;
377
378 nft_deactivate_next(ctx->net, flowtable);
379 ctx->table->use--;
380
381 return err;
382 }
383
384 /*
385 * Tables
386 */
387
388 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
389 const struct nlattr *nla,
390 u8 genmask)
391 {
392 struct nft_table *table;
393
394 list_for_each_entry(table, &afi->tables, list) {
395 if (!nla_strcmp(nla, table->name) &&
396 nft_active_genmask(table, genmask))
397 return table;
398 }
399 return NULL;
400 }
401
402 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
403 const struct nlattr *nla,
404 u8 genmask)
405 {
406 struct nft_table *table;
407
408 if (nla == NULL)
409 return ERR_PTR(-EINVAL);
410
411 table = nft_table_lookup(afi, nla, genmask);
412 if (table != NULL)
413 return table;
414
415 return ERR_PTR(-ENOENT);
416 }
417
418 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
419 {
420 return ++table->hgenerator;
421 }
422
423 static const struct nf_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
424
425 static const struct nf_chain_type *
426 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
427 {
428 int i;
429
430 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
431 if (chain_type[family][i] != NULL &&
432 !nla_strcmp(nla, chain_type[family][i]->name))
433 return chain_type[family][i];
434 }
435 return NULL;
436 }
437
438 static const struct nf_chain_type *
439 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
440 const struct nlattr *nla,
441 bool autoload)
442 {
443 const struct nf_chain_type *type;
444
445 type = __nf_tables_chain_type_lookup(afi->family, nla);
446 if (type != NULL)
447 return type;
448 #ifdef CONFIG_MODULES
449 if (autoload) {
450 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
451 request_module("nft-chain-%u-%.*s", afi->family,
452 nla_len(nla), (const char *)nla_data(nla));
453 nfnl_lock(NFNL_SUBSYS_NFTABLES);
454 type = __nf_tables_chain_type_lookup(afi->family, nla);
455 if (type != NULL)
456 return ERR_PTR(-EAGAIN);
457 }
458 #endif
459 return ERR_PTR(-ENOENT);
460 }
461
462 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
463 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
464 .len = NFT_TABLE_MAXNAMELEN - 1 },
465 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
466 };
467
468 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
469 u32 portid, u32 seq, int event, u32 flags,
470 int family, const struct nft_table *table)
471 {
472 struct nlmsghdr *nlh;
473 struct nfgenmsg *nfmsg;
474
475 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
476 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
477 if (nlh == NULL)
478 goto nla_put_failure;
479
480 nfmsg = nlmsg_data(nlh);
481 nfmsg->nfgen_family = family;
482 nfmsg->version = NFNETLINK_V0;
483 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
484
485 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
486 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
487 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
488 goto nla_put_failure;
489
490 nlmsg_end(skb, nlh);
491 return 0;
492
493 nla_put_failure:
494 nlmsg_trim(skb, nlh);
495 return -1;
496 }
497
498 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
499 {
500 struct sk_buff *skb;
501 int err;
502
503 if (!ctx->report &&
504 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
505 return;
506
507 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
508 if (skb == NULL)
509 goto err;
510
511 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
512 event, 0, ctx->afi->family, ctx->table);
513 if (err < 0) {
514 kfree_skb(skb);
515 goto err;
516 }
517
518 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
519 ctx->report, GFP_KERNEL);
520 return;
521 err:
522 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
523 }
524
525 static int nf_tables_dump_tables(struct sk_buff *skb,
526 struct netlink_callback *cb)
527 {
528 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
529 const struct nft_af_info *afi;
530 const struct nft_table *table;
531 unsigned int idx = 0, s_idx = cb->args[0];
532 struct net *net = sock_net(skb->sk);
533 int family = nfmsg->nfgen_family;
534
535 rcu_read_lock();
536 cb->seq = net->nft.base_seq;
537
538 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
539 if (family != NFPROTO_UNSPEC && family != afi->family)
540 continue;
541
542 list_for_each_entry_rcu(table, &afi->tables, list) {
543 if (idx < s_idx)
544 goto cont;
545 if (idx > s_idx)
546 memset(&cb->args[1], 0,
547 sizeof(cb->args) - sizeof(cb->args[0]));
548 if (!nft_is_active(net, table))
549 continue;
550 if (nf_tables_fill_table_info(skb, net,
551 NETLINK_CB(cb->skb).portid,
552 cb->nlh->nlmsg_seq,
553 NFT_MSG_NEWTABLE,
554 NLM_F_MULTI,
555 afi->family, table) < 0)
556 goto done;
557
558 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
559 cont:
560 idx++;
561 }
562 }
563 done:
564 rcu_read_unlock();
565 cb->args[0] = idx;
566 return skb->len;
567 }
568
569 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
570 struct sk_buff *skb, const struct nlmsghdr *nlh,
571 const struct nlattr * const nla[],
572 struct netlink_ext_ack *extack)
573 {
574 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
575 u8 genmask = nft_genmask_cur(net);
576 const struct nft_af_info *afi;
577 const struct nft_table *table;
578 struct sk_buff *skb2;
579 int family = nfmsg->nfgen_family;
580 int err;
581
582 if (nlh->nlmsg_flags & NLM_F_DUMP) {
583 struct netlink_dump_control c = {
584 .dump = nf_tables_dump_tables,
585 };
586 return netlink_dump_start(nlsk, skb, nlh, &c);
587 }
588
589 afi = nf_tables_afinfo_lookup(net, family, false);
590 if (IS_ERR(afi))
591 return PTR_ERR(afi);
592
593 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
594 if (IS_ERR(table))
595 return PTR_ERR(table);
596
597 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
598 if (!skb2)
599 return -ENOMEM;
600
601 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
602 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
603 family, table);
604 if (err < 0)
605 goto err;
606
607 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
608
609 err:
610 kfree_skb(skb2);
611 return err;
612 }
613
614 static void _nf_tables_table_disable(struct net *net,
615 const struct nft_af_info *afi,
616 struct nft_table *table,
617 u32 cnt)
618 {
619 struct nft_chain *chain;
620 u32 i = 0;
621
622 list_for_each_entry(chain, &table->chains, list) {
623 if (!nft_is_active_next(net, chain))
624 continue;
625 if (!nft_is_base_chain(chain))
626 continue;
627
628 if (cnt && i++ == cnt)
629 break;
630
631 nf_unregister_net_hook(net, &nft_base_chain(chain)->ops);
632 }
633 }
634
635 static int nf_tables_table_enable(struct net *net,
636 const struct nft_af_info *afi,
637 struct nft_table *table)
638 {
639 struct nft_chain *chain;
640 int err, i = 0;
641
642 list_for_each_entry(chain, &table->chains, list) {
643 if (!nft_is_active_next(net, chain))
644 continue;
645 if (!nft_is_base_chain(chain))
646 continue;
647
648 err = nf_register_net_hook(net, &nft_base_chain(chain)->ops);
649 if (err < 0)
650 goto err;
651
652 i++;
653 }
654 return 0;
655 err:
656 if (i)
657 _nf_tables_table_disable(net, afi, table, i);
658 return err;
659 }
660
661 static void nf_tables_table_disable(struct net *net,
662 const struct nft_af_info *afi,
663 struct nft_table *table)
664 {
665 _nf_tables_table_disable(net, afi, table, 0);
666 }
667
668 static int nf_tables_updtable(struct nft_ctx *ctx)
669 {
670 struct nft_trans *trans;
671 u32 flags;
672 int ret = 0;
673
674 if (!ctx->nla[NFTA_TABLE_FLAGS])
675 return 0;
676
677 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
678 if (flags & ~NFT_TABLE_F_DORMANT)
679 return -EINVAL;
680
681 if (flags == ctx->table->flags)
682 return 0;
683
684 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
685 sizeof(struct nft_trans_table));
686 if (trans == NULL)
687 return -ENOMEM;
688
689 if ((flags & NFT_TABLE_F_DORMANT) &&
690 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
691 nft_trans_table_enable(trans) = false;
692 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
693 ctx->table->flags & NFT_TABLE_F_DORMANT) {
694 ret = nf_tables_table_enable(ctx->net, ctx->afi, ctx->table);
695 if (ret >= 0) {
696 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
697 nft_trans_table_enable(trans) = true;
698 }
699 }
700 if (ret < 0)
701 goto err;
702
703 nft_trans_table_update(trans) = true;
704 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
705 return 0;
706 err:
707 nft_trans_destroy(trans);
708 return ret;
709 }
710
711 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
712 struct sk_buff *skb, const struct nlmsghdr *nlh,
713 const struct nlattr * const nla[],
714 struct netlink_ext_ack *extack)
715 {
716 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
717 u8 genmask = nft_genmask_next(net);
718 const struct nlattr *name;
719 struct nft_af_info *afi;
720 struct nft_table *table;
721 int family = nfmsg->nfgen_family;
722 u32 flags = 0;
723 struct nft_ctx ctx;
724 int err;
725
726 afi = nf_tables_afinfo_lookup(net, family, true);
727 if (IS_ERR(afi))
728 return PTR_ERR(afi);
729
730 name = nla[NFTA_TABLE_NAME];
731 table = nf_tables_table_lookup(afi, name, genmask);
732 if (IS_ERR(table)) {
733 if (PTR_ERR(table) != -ENOENT)
734 return PTR_ERR(table);
735 } else {
736 if (nlh->nlmsg_flags & NLM_F_EXCL)
737 return -EEXIST;
738 if (nlh->nlmsg_flags & NLM_F_REPLACE)
739 return -EOPNOTSUPP;
740
741 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
742 return nf_tables_updtable(&ctx);
743 }
744
745 if (nla[NFTA_TABLE_FLAGS]) {
746 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
747 if (flags & ~NFT_TABLE_F_DORMANT)
748 return -EINVAL;
749 }
750
751 err = -EAFNOSUPPORT;
752 if (!try_module_get(afi->owner))
753 goto err1;
754
755 err = -ENOMEM;
756 table = kzalloc(sizeof(*table), GFP_KERNEL);
757 if (table == NULL)
758 goto err2;
759
760 table->name = nla_strdup(name, GFP_KERNEL);
761 if (table->name == NULL)
762 goto err3;
763
764 INIT_LIST_HEAD(&table->chains);
765 INIT_LIST_HEAD(&table->sets);
766 INIT_LIST_HEAD(&table->objects);
767 INIT_LIST_HEAD(&table->flowtables);
768 table->flags = flags;
769
770 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
771 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
772 if (err < 0)
773 goto err4;
774
775 list_add_tail_rcu(&table->list, &afi->tables);
776 return 0;
777 err4:
778 kfree(table->name);
779 err3:
780 kfree(table);
781 err2:
782 module_put(afi->owner);
783 err1:
784 return err;
785 }
786
787 static int nft_flush_table(struct nft_ctx *ctx)
788 {
789 struct nft_flowtable *flowtable, *nft;
790 struct nft_chain *chain, *nc;
791 struct nft_object *obj, *ne;
792 struct nft_set *set, *ns;
793 int err;
794
795 list_for_each_entry(chain, &ctx->table->chains, list) {
796 if (!nft_is_active_next(ctx->net, chain))
797 continue;
798
799 ctx->chain = chain;
800
801 err = nft_delrule_by_chain(ctx);
802 if (err < 0)
803 goto out;
804 }
805
806 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
807 if (!nft_is_active_next(ctx->net, set))
808 continue;
809
810 if (nft_set_is_anonymous(set) &&
811 !list_empty(&set->bindings))
812 continue;
813
814 err = nft_delset(ctx, set);
815 if (err < 0)
816 goto out;
817 }
818
819 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
820 err = nft_delflowtable(ctx, flowtable);
821 if (err < 0)
822 goto out;
823 }
824
825 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
826 err = nft_delobj(ctx, obj);
827 if (err < 0)
828 goto out;
829 }
830
831 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
832 if (!nft_is_active_next(ctx->net, chain))
833 continue;
834
835 ctx->chain = chain;
836
837 err = nft_delchain(ctx);
838 if (err < 0)
839 goto out;
840 }
841
842 err = nft_deltable(ctx);
843 out:
844 return err;
845 }
846
847 static int nft_flush(struct nft_ctx *ctx, int family)
848 {
849 struct nft_af_info *afi;
850 struct nft_table *table, *nt;
851 const struct nlattr * const *nla = ctx->nla;
852 int err = 0;
853
854 list_for_each_entry(afi, &ctx->net->nft.af_info, list) {
855 if (family != AF_UNSPEC && afi->family != family)
856 continue;
857
858 ctx->afi = afi;
859 list_for_each_entry_safe(table, nt, &afi->tables, list) {
860 if (!nft_is_active_next(ctx->net, table))
861 continue;
862
863 if (nla[NFTA_TABLE_NAME] &&
864 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
865 continue;
866
867 ctx->table = table;
868
869 err = nft_flush_table(ctx);
870 if (err < 0)
871 goto out;
872 }
873 }
874 out:
875 return err;
876 }
877
878 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
879 struct sk_buff *skb, const struct nlmsghdr *nlh,
880 const struct nlattr * const nla[],
881 struct netlink_ext_ack *extack)
882 {
883 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
884 u8 genmask = nft_genmask_next(net);
885 struct nft_af_info *afi;
886 struct nft_table *table;
887 int family = nfmsg->nfgen_family;
888 struct nft_ctx ctx;
889
890 nft_ctx_init(&ctx, net, skb, nlh, NULL, NULL, NULL, nla);
891 if (family == AF_UNSPEC || nla[NFTA_TABLE_NAME] == NULL)
892 return nft_flush(&ctx, family);
893
894 afi = nf_tables_afinfo_lookup(net, family, false);
895 if (IS_ERR(afi))
896 return PTR_ERR(afi);
897
898 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME], genmask);
899 if (IS_ERR(table))
900 return PTR_ERR(table);
901
902 if (nlh->nlmsg_flags & NLM_F_NONREC &&
903 table->use > 0)
904 return -EBUSY;
905
906 ctx.afi = afi;
907 ctx.table = table;
908
909 return nft_flush_table(&ctx);
910 }
911
912 static void nf_tables_table_destroy(struct nft_ctx *ctx)
913 {
914 BUG_ON(ctx->table->use > 0);
915
916 kfree(ctx->table->name);
917 kfree(ctx->table);
918 module_put(ctx->afi->owner);
919 }
920
921 int nft_register_chain_type(const struct nf_chain_type *ctype)
922 {
923 int err = 0;
924
925 if (WARN_ON(ctype->family >= NFPROTO_NUMPROTO))
926 return -EINVAL;
927
928 nfnl_lock(NFNL_SUBSYS_NFTABLES);
929 if (chain_type[ctype->family][ctype->type] != NULL) {
930 err = -EBUSY;
931 goto out;
932 }
933 chain_type[ctype->family][ctype->type] = ctype;
934 out:
935 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
936 return err;
937 }
938 EXPORT_SYMBOL_GPL(nft_register_chain_type);
939
940 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
941 {
942 nfnl_lock(NFNL_SUBSYS_NFTABLES);
943 chain_type[ctype->family][ctype->type] = NULL;
944 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
945 }
946 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
947
948 /*
949 * Chains
950 */
951
952 static struct nft_chain *
953 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle,
954 u8 genmask)
955 {
956 struct nft_chain *chain;
957
958 list_for_each_entry(chain, &table->chains, list) {
959 if (chain->handle == handle &&
960 nft_active_genmask(chain, genmask))
961 return chain;
962 }
963
964 return ERR_PTR(-ENOENT);
965 }
966
967 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
968 const struct nlattr *nla,
969 u8 genmask)
970 {
971 struct nft_chain *chain;
972
973 if (nla == NULL)
974 return ERR_PTR(-EINVAL);
975
976 list_for_each_entry(chain, &table->chains, list) {
977 if (!nla_strcmp(nla, chain->name) &&
978 nft_active_genmask(chain, genmask))
979 return chain;
980 }
981
982 return ERR_PTR(-ENOENT);
983 }
984
985 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
986 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
987 .len = NFT_TABLE_MAXNAMELEN - 1 },
988 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
989 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
990 .len = NFT_CHAIN_MAXNAMELEN - 1 },
991 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
992 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
993 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
994 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
995 };
996
997 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
998 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
999 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1000 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1001 .len = IFNAMSIZ - 1 },
1002 };
1003
1004 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1005 {
1006 struct nft_stats *cpu_stats, total;
1007 struct nlattr *nest;
1008 unsigned int seq;
1009 u64 pkts, bytes;
1010 int cpu;
1011
1012 memset(&total, 0, sizeof(total));
1013 for_each_possible_cpu(cpu) {
1014 cpu_stats = per_cpu_ptr(stats, cpu);
1015 do {
1016 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1017 pkts = cpu_stats->pkts;
1018 bytes = cpu_stats->bytes;
1019 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1020 total.pkts += pkts;
1021 total.bytes += bytes;
1022 }
1023 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
1024 if (nest == NULL)
1025 goto nla_put_failure;
1026
1027 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1028 NFTA_COUNTER_PAD) ||
1029 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1030 NFTA_COUNTER_PAD))
1031 goto nla_put_failure;
1032
1033 nla_nest_end(skb, nest);
1034 return 0;
1035
1036 nla_put_failure:
1037 return -ENOSPC;
1038 }
1039
1040 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1041 u32 portid, u32 seq, int event, u32 flags,
1042 int family, const struct nft_table *table,
1043 const struct nft_chain *chain)
1044 {
1045 struct nlmsghdr *nlh;
1046 struct nfgenmsg *nfmsg;
1047
1048 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1049 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1050 if (nlh == NULL)
1051 goto nla_put_failure;
1052
1053 nfmsg = nlmsg_data(nlh);
1054 nfmsg->nfgen_family = family;
1055 nfmsg->version = NFNETLINK_V0;
1056 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1057
1058 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1059 goto nla_put_failure;
1060 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1061 NFTA_CHAIN_PAD))
1062 goto nla_put_failure;
1063 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1064 goto nla_put_failure;
1065
1066 if (nft_is_base_chain(chain)) {
1067 const struct nft_base_chain *basechain = nft_base_chain(chain);
1068 const struct nf_hook_ops *ops = &basechain->ops;
1069 struct nlattr *nest;
1070
1071 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
1072 if (nest == NULL)
1073 goto nla_put_failure;
1074 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1075 goto nla_put_failure;
1076 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1077 goto nla_put_failure;
1078 if (basechain->dev_name[0] &&
1079 nla_put_string(skb, NFTA_HOOK_DEV, basechain->dev_name))
1080 goto nla_put_failure;
1081 nla_nest_end(skb, nest);
1082
1083 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1084 htonl(basechain->policy)))
1085 goto nla_put_failure;
1086
1087 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1088 goto nla_put_failure;
1089
1090 if (basechain->stats && nft_dump_stats(skb, basechain->stats))
1091 goto nla_put_failure;
1092 }
1093
1094 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1095 goto nla_put_failure;
1096
1097 nlmsg_end(skb, nlh);
1098 return 0;
1099
1100 nla_put_failure:
1101 nlmsg_trim(skb, nlh);
1102 return -1;
1103 }
1104
1105 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1106 {
1107 struct sk_buff *skb;
1108 int err;
1109
1110 if (!ctx->report &&
1111 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1112 return;
1113
1114 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1115 if (skb == NULL)
1116 goto err;
1117
1118 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1119 event, 0, ctx->afi->family, ctx->table,
1120 ctx->chain);
1121 if (err < 0) {
1122 kfree_skb(skb);
1123 goto err;
1124 }
1125
1126 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1127 ctx->report, GFP_KERNEL);
1128 return;
1129 err:
1130 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1131 }
1132
1133 static int nf_tables_dump_chains(struct sk_buff *skb,
1134 struct netlink_callback *cb)
1135 {
1136 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1137 const struct nft_af_info *afi;
1138 const struct nft_table *table;
1139 const struct nft_chain *chain;
1140 unsigned int idx = 0, s_idx = cb->args[0];
1141 struct net *net = sock_net(skb->sk);
1142 int family = nfmsg->nfgen_family;
1143
1144 rcu_read_lock();
1145 cb->seq = net->nft.base_seq;
1146
1147 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1148 if (family != NFPROTO_UNSPEC && family != afi->family)
1149 continue;
1150
1151 list_for_each_entry_rcu(table, &afi->tables, list) {
1152 list_for_each_entry_rcu(chain, &table->chains, list) {
1153 if (idx < s_idx)
1154 goto cont;
1155 if (idx > s_idx)
1156 memset(&cb->args[1], 0,
1157 sizeof(cb->args) - sizeof(cb->args[0]));
1158 if (!nft_is_active(net, chain))
1159 continue;
1160 if (nf_tables_fill_chain_info(skb, net,
1161 NETLINK_CB(cb->skb).portid,
1162 cb->nlh->nlmsg_seq,
1163 NFT_MSG_NEWCHAIN,
1164 NLM_F_MULTI,
1165 afi->family, table, chain) < 0)
1166 goto done;
1167
1168 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1169 cont:
1170 idx++;
1171 }
1172 }
1173 }
1174 done:
1175 rcu_read_unlock();
1176 cb->args[0] = idx;
1177 return skb->len;
1178 }
1179
1180 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1181 struct sk_buff *skb, const struct nlmsghdr *nlh,
1182 const struct nlattr * const nla[],
1183 struct netlink_ext_ack *extack)
1184 {
1185 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1186 u8 genmask = nft_genmask_cur(net);
1187 const struct nft_af_info *afi;
1188 const struct nft_table *table;
1189 const struct nft_chain *chain;
1190 struct sk_buff *skb2;
1191 int family = nfmsg->nfgen_family;
1192 int err;
1193
1194 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1195 struct netlink_dump_control c = {
1196 .dump = nf_tables_dump_chains,
1197 };
1198 return netlink_dump_start(nlsk, skb, nlh, &c);
1199 }
1200
1201 afi = nf_tables_afinfo_lookup(net, family, false);
1202 if (IS_ERR(afi))
1203 return PTR_ERR(afi);
1204
1205 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1206 if (IS_ERR(table))
1207 return PTR_ERR(table);
1208
1209 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1210 if (IS_ERR(chain))
1211 return PTR_ERR(chain);
1212
1213 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1214 if (!skb2)
1215 return -ENOMEM;
1216
1217 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1218 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1219 family, table, chain);
1220 if (err < 0)
1221 goto err;
1222
1223 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1224
1225 err:
1226 kfree_skb(skb2);
1227 return err;
1228 }
1229
1230 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1231 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1232 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1233 };
1234
1235 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1236 {
1237 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1238 struct nft_stats __percpu *newstats;
1239 struct nft_stats *stats;
1240 int err;
1241
1242 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy,
1243 NULL);
1244 if (err < 0)
1245 return ERR_PTR(err);
1246
1247 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1248 return ERR_PTR(-EINVAL);
1249
1250 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1251 if (newstats == NULL)
1252 return ERR_PTR(-ENOMEM);
1253
1254 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1255 * are not exposed to userspace.
1256 */
1257 preempt_disable();
1258 stats = this_cpu_ptr(newstats);
1259 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1260 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1261 preempt_enable();
1262
1263 return newstats;
1264 }
1265
1266 static void nft_chain_stats_replace(struct nft_base_chain *chain,
1267 struct nft_stats __percpu *newstats)
1268 {
1269 struct nft_stats __percpu *oldstats;
1270
1271 if (newstats == NULL)
1272 return;
1273
1274 if (chain->stats) {
1275 oldstats = nfnl_dereference(chain->stats, NFNL_SUBSYS_NFTABLES);
1276 rcu_assign_pointer(chain->stats, newstats);
1277 synchronize_rcu();
1278 free_percpu(oldstats);
1279 } else
1280 rcu_assign_pointer(chain->stats, newstats);
1281 }
1282
1283 static void nf_tables_chain_destroy(struct nft_chain *chain)
1284 {
1285 BUG_ON(chain->use > 0);
1286
1287 if (nft_is_base_chain(chain)) {
1288 struct nft_base_chain *basechain = nft_base_chain(chain);
1289
1290 module_put(basechain->type->owner);
1291 free_percpu(basechain->stats);
1292 if (basechain->stats)
1293 static_branch_dec(&nft_counters_enabled);
1294 if (basechain->ops.dev != NULL)
1295 dev_put(basechain->ops.dev);
1296 kfree(chain->name);
1297 kfree(basechain);
1298 } else {
1299 kfree(chain->name);
1300 kfree(chain);
1301 }
1302 }
1303
1304 struct nft_chain_hook {
1305 u32 num;
1306 s32 priority;
1307 const struct nf_chain_type *type;
1308 struct net_device *dev;
1309 };
1310
1311 static int nft_chain_parse_hook(struct net *net,
1312 const struct nlattr * const nla[],
1313 struct nft_af_info *afi,
1314 struct nft_chain_hook *hook, bool create)
1315 {
1316 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1317 const struct nf_chain_type *type;
1318 struct net_device *dev;
1319 int err;
1320
1321 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1322 nft_hook_policy, NULL);
1323 if (err < 0)
1324 return err;
1325
1326 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1327 ha[NFTA_HOOK_PRIORITY] == NULL)
1328 return -EINVAL;
1329
1330 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1331 if (hook->num >= afi->nhooks)
1332 return -EINVAL;
1333
1334 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1335
1336 type = chain_type[afi->family][NFT_CHAIN_T_DEFAULT];
1337 if (nla[NFTA_CHAIN_TYPE]) {
1338 type = nf_tables_chain_type_lookup(afi, nla[NFTA_CHAIN_TYPE],
1339 create);
1340 if (IS_ERR(type))
1341 return PTR_ERR(type);
1342 }
1343 if (!(type->hook_mask & (1 << hook->num)))
1344 return -EOPNOTSUPP;
1345
1346 if (type->type == NFT_CHAIN_T_NAT &&
1347 hook->priority <= NF_IP_PRI_CONNTRACK)
1348 return -EOPNOTSUPP;
1349
1350 if (!try_module_get(type->owner))
1351 return -ENOENT;
1352
1353 hook->type = type;
1354
1355 hook->dev = NULL;
1356 if (afi->flags & NFT_AF_NEEDS_DEV) {
1357 char ifname[IFNAMSIZ];
1358
1359 if (!ha[NFTA_HOOK_DEV]) {
1360 module_put(type->owner);
1361 return -EOPNOTSUPP;
1362 }
1363
1364 nla_strlcpy(ifname, ha[NFTA_HOOK_DEV], IFNAMSIZ);
1365 dev = dev_get_by_name(net, ifname);
1366 if (!dev) {
1367 module_put(type->owner);
1368 return -ENOENT;
1369 }
1370 hook->dev = dev;
1371 } else if (ha[NFTA_HOOK_DEV]) {
1372 module_put(type->owner);
1373 return -EOPNOTSUPP;
1374 }
1375
1376 return 0;
1377 }
1378
1379 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1380 {
1381 module_put(hook->type->owner);
1382 if (hook->dev != NULL)
1383 dev_put(hook->dev);
1384 }
1385
1386 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1387 u8 policy, bool create)
1388 {
1389 const struct nlattr * const *nla = ctx->nla;
1390 struct nft_table *table = ctx->table;
1391 struct nft_af_info *afi = ctx->afi;
1392 struct nft_base_chain *basechain;
1393 struct nft_stats __percpu *stats;
1394 struct net *net = ctx->net;
1395 struct nft_chain *chain;
1396 int err;
1397
1398 if (table->use == UINT_MAX)
1399 return -EOVERFLOW;
1400
1401 if (nla[NFTA_CHAIN_HOOK]) {
1402 struct nft_chain_hook hook;
1403 struct nf_hook_ops *ops;
1404
1405 err = nft_chain_parse_hook(net, nla, afi, &hook, create);
1406 if (err < 0)
1407 return err;
1408
1409 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1410 if (basechain == NULL) {
1411 nft_chain_release_hook(&hook);
1412 return -ENOMEM;
1413 }
1414
1415 if (hook.dev != NULL)
1416 strncpy(basechain->dev_name, hook.dev->name, IFNAMSIZ);
1417
1418 if (nla[NFTA_CHAIN_COUNTERS]) {
1419 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1420 if (IS_ERR(stats)) {
1421 nft_chain_release_hook(&hook);
1422 kfree(basechain);
1423 return PTR_ERR(stats);
1424 }
1425 basechain->stats = stats;
1426 static_branch_inc(&nft_counters_enabled);
1427 }
1428
1429 basechain->type = hook.type;
1430 chain = &basechain->chain;
1431
1432 ops = &basechain->ops;
1433 ops->pf = family;
1434 ops->hooknum = hook.num;
1435 ops->priority = hook.priority;
1436 ops->priv = chain;
1437 ops->hook = hook.type->hooks[ops->hooknum];
1438 ops->dev = hook.dev;
1439
1440 if (basechain->type->type == NFT_CHAIN_T_NAT)
1441 ops->nat_hook = true;
1442
1443 chain->flags |= NFT_BASE_CHAIN;
1444 basechain->policy = policy;
1445 } else {
1446 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1447 if (chain == NULL)
1448 return -ENOMEM;
1449 }
1450 INIT_LIST_HEAD(&chain->rules);
1451 chain->handle = nf_tables_alloc_handle(table);
1452 chain->table = table;
1453 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
1454 if (!chain->name) {
1455 err = -ENOMEM;
1456 goto err1;
1457 }
1458
1459 err = nf_tables_register_hook(net, table, chain);
1460 if (err < 0)
1461 goto err1;
1462
1463 ctx->chain = chain;
1464 err = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
1465 if (err < 0)
1466 goto err2;
1467
1468 table->use++;
1469 list_add_tail_rcu(&chain->list, &table->chains);
1470
1471 return 0;
1472 err2:
1473 nf_tables_unregister_hook(net, table, chain);
1474 err1:
1475 nf_tables_chain_destroy(chain);
1476
1477 return err;
1478 }
1479
1480 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
1481 bool create)
1482 {
1483 const struct nlattr * const *nla = ctx->nla;
1484 struct nft_table *table = ctx->table;
1485 struct nft_chain *chain = ctx->chain;
1486 struct nft_base_chain *basechain;
1487 struct nft_stats *stats = NULL;
1488 struct nft_chain_hook hook;
1489 const struct nlattr *name;
1490 struct nf_hook_ops *ops;
1491 struct nft_trans *trans;
1492 int err;
1493
1494 if (nla[NFTA_CHAIN_HOOK]) {
1495 if (!nft_is_base_chain(chain))
1496 return -EBUSY;
1497
1498 err = nft_chain_parse_hook(ctx->net, nla, ctx->afi, &hook,
1499 create);
1500 if (err < 0)
1501 return err;
1502
1503 basechain = nft_base_chain(chain);
1504 if (basechain->type != hook.type) {
1505 nft_chain_release_hook(&hook);
1506 return -EBUSY;
1507 }
1508
1509 ops = &basechain->ops;
1510 if (ops->hooknum != hook.num ||
1511 ops->priority != hook.priority ||
1512 ops->dev != hook.dev) {
1513 nft_chain_release_hook(&hook);
1514 return -EBUSY;
1515 }
1516 nft_chain_release_hook(&hook);
1517 }
1518
1519 if (nla[NFTA_CHAIN_HANDLE] &&
1520 nla[NFTA_CHAIN_NAME]) {
1521 struct nft_chain *chain2;
1522
1523 chain2 = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME],
1524 genmask);
1525 if (!IS_ERR(chain2))
1526 return -EEXIST;
1527 }
1528
1529 if (nla[NFTA_CHAIN_COUNTERS]) {
1530 if (!nft_is_base_chain(chain))
1531 return -EOPNOTSUPP;
1532
1533 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1534 if (IS_ERR(stats))
1535 return PTR_ERR(stats);
1536 }
1537
1538 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
1539 sizeof(struct nft_trans_chain));
1540 if (trans == NULL) {
1541 free_percpu(stats);
1542 return -ENOMEM;
1543 }
1544
1545 nft_trans_chain_stats(trans) = stats;
1546 nft_trans_chain_update(trans) = true;
1547
1548 if (nla[NFTA_CHAIN_POLICY])
1549 nft_trans_chain_policy(trans) = policy;
1550 else
1551 nft_trans_chain_policy(trans) = -1;
1552
1553 name = nla[NFTA_CHAIN_NAME];
1554 if (nla[NFTA_CHAIN_HANDLE] && name) {
1555 nft_trans_chain_name(trans) =
1556 nla_strdup(name, GFP_KERNEL);
1557 if (!nft_trans_chain_name(trans)) {
1558 kfree(trans);
1559 free_percpu(stats);
1560 return -ENOMEM;
1561 }
1562 }
1563 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1564
1565 return 0;
1566 }
1567
1568 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
1569 struct sk_buff *skb, const struct nlmsghdr *nlh,
1570 const struct nlattr * const nla[],
1571 struct netlink_ext_ack *extack)
1572 {
1573 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1574 const struct nlattr * uninitialized_var(name);
1575 u8 genmask = nft_genmask_next(net);
1576 int family = nfmsg->nfgen_family;
1577 struct nft_af_info *afi;
1578 struct nft_table *table;
1579 struct nft_chain *chain;
1580 u8 policy = NF_ACCEPT;
1581 struct nft_ctx ctx;
1582 u64 handle = 0;
1583 bool create;
1584
1585 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1586
1587 afi = nf_tables_afinfo_lookup(net, family, true);
1588 if (IS_ERR(afi))
1589 return PTR_ERR(afi);
1590
1591 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1592 if (IS_ERR(table))
1593 return PTR_ERR(table);
1594
1595 chain = NULL;
1596 name = nla[NFTA_CHAIN_NAME];
1597
1598 if (nla[NFTA_CHAIN_HANDLE]) {
1599 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
1600 chain = nf_tables_chain_lookup_byhandle(table, handle, genmask);
1601 if (IS_ERR(chain))
1602 return PTR_ERR(chain);
1603 } else {
1604 chain = nf_tables_chain_lookup(table, name, genmask);
1605 if (IS_ERR(chain)) {
1606 if (PTR_ERR(chain) != -ENOENT)
1607 return PTR_ERR(chain);
1608 chain = NULL;
1609 }
1610 }
1611
1612 if (nla[NFTA_CHAIN_POLICY]) {
1613 if (chain != NULL &&
1614 !nft_is_base_chain(chain))
1615 return -EOPNOTSUPP;
1616
1617 if (chain == NULL &&
1618 nla[NFTA_CHAIN_HOOK] == NULL)
1619 return -EOPNOTSUPP;
1620
1621 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
1622 switch (policy) {
1623 case NF_DROP:
1624 case NF_ACCEPT:
1625 break;
1626 default:
1627 return -EINVAL;
1628 }
1629 }
1630
1631 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1632
1633 if (chain != NULL) {
1634 if (nlh->nlmsg_flags & NLM_F_EXCL)
1635 return -EEXIST;
1636 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1637 return -EOPNOTSUPP;
1638
1639 return nf_tables_updchain(&ctx, genmask, policy, create);
1640 }
1641
1642 return nf_tables_addchain(&ctx, family, genmask, policy, create);
1643 }
1644
1645 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
1646 struct sk_buff *skb, const struct nlmsghdr *nlh,
1647 const struct nlattr * const nla[],
1648 struct netlink_ext_ack *extack)
1649 {
1650 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1651 u8 genmask = nft_genmask_next(net);
1652 struct nft_af_info *afi;
1653 struct nft_table *table;
1654 struct nft_chain *chain;
1655 struct nft_rule *rule;
1656 int family = nfmsg->nfgen_family;
1657 struct nft_ctx ctx;
1658 u32 use;
1659 int err;
1660
1661 afi = nf_tables_afinfo_lookup(net, family, false);
1662 if (IS_ERR(afi))
1663 return PTR_ERR(afi);
1664
1665 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE], genmask);
1666 if (IS_ERR(table))
1667 return PTR_ERR(table);
1668
1669 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME], genmask);
1670 if (IS_ERR(chain))
1671 return PTR_ERR(chain);
1672
1673 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1674 chain->use > 0)
1675 return -EBUSY;
1676
1677 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
1678
1679 use = chain->use;
1680 list_for_each_entry(rule, &chain->rules, list) {
1681 if (!nft_is_active_next(net, rule))
1682 continue;
1683 use--;
1684
1685 err = nft_delrule(&ctx, rule);
1686 if (err < 0)
1687 return err;
1688 }
1689
1690 /* There are rules and elements that are still holding references to us,
1691 * we cannot do a recursive removal in this case.
1692 */
1693 if (use > 0)
1694 return -EBUSY;
1695
1696 return nft_delchain(&ctx);
1697 }
1698
1699 /*
1700 * Expressions
1701 */
1702
1703 /**
1704 * nft_register_expr - register nf_tables expr type
1705 * @ops: expr type
1706 *
1707 * Registers the expr type for use with nf_tables. Returns zero on
1708 * success or a negative errno code otherwise.
1709 */
1710 int nft_register_expr(struct nft_expr_type *type)
1711 {
1712 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1713 if (type->family == NFPROTO_UNSPEC)
1714 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1715 else
1716 list_add_rcu(&type->list, &nf_tables_expressions);
1717 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1718 return 0;
1719 }
1720 EXPORT_SYMBOL_GPL(nft_register_expr);
1721
1722 /**
1723 * nft_unregister_expr - unregister nf_tables expr type
1724 * @ops: expr type
1725 *
1726 * Unregisters the expr typefor use with nf_tables.
1727 */
1728 void nft_unregister_expr(struct nft_expr_type *type)
1729 {
1730 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1731 list_del_rcu(&type->list);
1732 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1733 }
1734 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1735
1736 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1737 struct nlattr *nla)
1738 {
1739 const struct nft_expr_type *type;
1740
1741 list_for_each_entry(type, &nf_tables_expressions, list) {
1742 if (!nla_strcmp(nla, type->name) &&
1743 (!type->family || type->family == family))
1744 return type;
1745 }
1746 return NULL;
1747 }
1748
1749 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1750 struct nlattr *nla)
1751 {
1752 const struct nft_expr_type *type;
1753
1754 if (nla == NULL)
1755 return ERR_PTR(-EINVAL);
1756
1757 type = __nft_expr_type_get(family, nla);
1758 if (type != NULL && try_module_get(type->owner))
1759 return type;
1760
1761 #ifdef CONFIG_MODULES
1762 if (type == NULL) {
1763 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1764 request_module("nft-expr-%u-%.*s", family,
1765 nla_len(nla), (char *)nla_data(nla));
1766 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1767 if (__nft_expr_type_get(family, nla))
1768 return ERR_PTR(-EAGAIN);
1769
1770 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1771 request_module("nft-expr-%.*s",
1772 nla_len(nla), (char *)nla_data(nla));
1773 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1774 if (__nft_expr_type_get(family, nla))
1775 return ERR_PTR(-EAGAIN);
1776 }
1777 #endif
1778 return ERR_PTR(-ENOENT);
1779 }
1780
1781 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1782 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1783 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1784 };
1785
1786 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1787 const struct nft_expr *expr)
1788 {
1789 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1790 goto nla_put_failure;
1791
1792 if (expr->ops->dump) {
1793 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1794 if (data == NULL)
1795 goto nla_put_failure;
1796 if (expr->ops->dump(skb, expr) < 0)
1797 goto nla_put_failure;
1798 nla_nest_end(skb, data);
1799 }
1800
1801 return skb->len;
1802
1803 nla_put_failure:
1804 return -1;
1805 };
1806
1807 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
1808 const struct nft_expr *expr)
1809 {
1810 struct nlattr *nest;
1811
1812 nest = nla_nest_start(skb, attr);
1813 if (!nest)
1814 goto nla_put_failure;
1815 if (nf_tables_fill_expr_info(skb, expr) < 0)
1816 goto nla_put_failure;
1817 nla_nest_end(skb, nest);
1818 return 0;
1819
1820 nla_put_failure:
1821 return -1;
1822 }
1823
1824 struct nft_expr_info {
1825 const struct nft_expr_ops *ops;
1826 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1827 };
1828
1829 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1830 const struct nlattr *nla,
1831 struct nft_expr_info *info)
1832 {
1833 const struct nft_expr_type *type;
1834 const struct nft_expr_ops *ops;
1835 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1836 int err;
1837
1838 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy, NULL);
1839 if (err < 0)
1840 return err;
1841
1842 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1843 if (IS_ERR(type))
1844 return PTR_ERR(type);
1845
1846 if (tb[NFTA_EXPR_DATA]) {
1847 err = nla_parse_nested(info->tb, type->maxattr,
1848 tb[NFTA_EXPR_DATA], type->policy, NULL);
1849 if (err < 0)
1850 goto err1;
1851 } else
1852 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1853
1854 if (type->select_ops != NULL) {
1855 ops = type->select_ops(ctx,
1856 (const struct nlattr * const *)info->tb);
1857 if (IS_ERR(ops)) {
1858 err = PTR_ERR(ops);
1859 goto err1;
1860 }
1861 } else
1862 ops = type->ops;
1863
1864 info->ops = ops;
1865 return 0;
1866
1867 err1:
1868 module_put(type->owner);
1869 return err;
1870 }
1871
1872 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1873 const struct nft_expr_info *info,
1874 struct nft_expr *expr)
1875 {
1876 const struct nft_expr_ops *ops = info->ops;
1877 int err;
1878
1879 expr->ops = ops;
1880 if (ops->init) {
1881 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1882 if (err < 0)
1883 goto err1;
1884 }
1885
1886 if (ops->validate) {
1887 const struct nft_data *data = NULL;
1888
1889 err = ops->validate(ctx, expr, &data);
1890 if (err < 0)
1891 goto err2;
1892 }
1893
1894 return 0;
1895
1896 err2:
1897 if (ops->destroy)
1898 ops->destroy(ctx, expr);
1899 err1:
1900 expr->ops = NULL;
1901 return err;
1902 }
1903
1904 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1905 struct nft_expr *expr)
1906 {
1907 if (expr->ops->destroy)
1908 expr->ops->destroy(ctx, expr);
1909 module_put(expr->ops->type->owner);
1910 }
1911
1912 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
1913 const struct nlattr *nla)
1914 {
1915 struct nft_expr_info info;
1916 struct nft_expr *expr;
1917 int err;
1918
1919 err = nf_tables_expr_parse(ctx, nla, &info);
1920 if (err < 0)
1921 goto err1;
1922
1923 err = -ENOMEM;
1924 expr = kzalloc(info.ops->size, GFP_KERNEL);
1925 if (expr == NULL)
1926 goto err2;
1927
1928 err = nf_tables_newexpr(ctx, &info, expr);
1929 if (err < 0)
1930 goto err3;
1931
1932 return expr;
1933 err3:
1934 kfree(expr);
1935 err2:
1936 module_put(info.ops->type->owner);
1937 err1:
1938 return ERR_PTR(err);
1939 }
1940
1941 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
1942 {
1943 nf_tables_expr_destroy(ctx, expr);
1944 kfree(expr);
1945 }
1946
1947 /*
1948 * Rules
1949 */
1950
1951 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1952 u64 handle)
1953 {
1954 struct nft_rule *rule;
1955
1956 // FIXME: this sucks
1957 list_for_each_entry(rule, &chain->rules, list) {
1958 if (handle == rule->handle)
1959 return rule;
1960 }
1961
1962 return ERR_PTR(-ENOENT);
1963 }
1964
1965 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1966 const struct nlattr *nla)
1967 {
1968 if (nla == NULL)
1969 return ERR_PTR(-EINVAL);
1970
1971 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1972 }
1973
1974 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1975 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
1976 .len = NFT_TABLE_MAXNAMELEN - 1 },
1977 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1978 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1979 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1980 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1981 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1982 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1983 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1984 .len = NFT_USERDATA_MAXLEN },
1985 };
1986
1987 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
1988 u32 portid, u32 seq, int event,
1989 u32 flags, int family,
1990 const struct nft_table *table,
1991 const struct nft_chain *chain,
1992 const struct nft_rule *rule)
1993 {
1994 struct nlmsghdr *nlh;
1995 struct nfgenmsg *nfmsg;
1996 const struct nft_expr *expr, *next;
1997 struct nlattr *list;
1998 const struct nft_rule *prule;
1999 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2000
2001 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2002 if (nlh == NULL)
2003 goto nla_put_failure;
2004
2005 nfmsg = nlmsg_data(nlh);
2006 nfmsg->nfgen_family = family;
2007 nfmsg->version = NFNETLINK_V0;
2008 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2009
2010 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2011 goto nla_put_failure;
2012 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2013 goto nla_put_failure;
2014 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2015 NFTA_RULE_PAD))
2016 goto nla_put_failure;
2017
2018 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
2019 prule = list_prev_entry(rule, list);
2020 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2021 cpu_to_be64(prule->handle),
2022 NFTA_RULE_PAD))
2023 goto nla_put_failure;
2024 }
2025
2026 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
2027 if (list == NULL)
2028 goto nla_put_failure;
2029 nft_rule_for_each_expr(expr, next, rule) {
2030 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2031 goto nla_put_failure;
2032 }
2033 nla_nest_end(skb, list);
2034
2035 if (rule->udata) {
2036 struct nft_userdata *udata = nft_userdata(rule);
2037 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2038 udata->data) < 0)
2039 goto nla_put_failure;
2040 }
2041
2042 nlmsg_end(skb, nlh);
2043 return 0;
2044
2045 nla_put_failure:
2046 nlmsg_trim(skb, nlh);
2047 return -1;
2048 }
2049
2050 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2051 const struct nft_rule *rule, int event)
2052 {
2053 struct sk_buff *skb;
2054 int err;
2055
2056 if (!ctx->report &&
2057 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2058 return;
2059
2060 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2061 if (skb == NULL)
2062 goto err;
2063
2064 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2065 event, 0, ctx->afi->family, ctx->table,
2066 ctx->chain, rule);
2067 if (err < 0) {
2068 kfree_skb(skb);
2069 goto err;
2070 }
2071
2072 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2073 ctx->report, GFP_KERNEL);
2074 return;
2075 err:
2076 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2077 }
2078
2079 struct nft_rule_dump_ctx {
2080 char *table;
2081 char *chain;
2082 };
2083
2084 static int nf_tables_dump_rules(struct sk_buff *skb,
2085 struct netlink_callback *cb)
2086 {
2087 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2088 const struct nft_rule_dump_ctx *ctx = cb->data;
2089 const struct nft_af_info *afi;
2090 const struct nft_table *table;
2091 const struct nft_chain *chain;
2092 const struct nft_rule *rule;
2093 unsigned int idx = 0, s_idx = cb->args[0];
2094 struct net *net = sock_net(skb->sk);
2095 int family = nfmsg->nfgen_family;
2096
2097 rcu_read_lock();
2098 cb->seq = net->nft.base_seq;
2099
2100 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2101 if (family != NFPROTO_UNSPEC && family != afi->family)
2102 continue;
2103
2104 list_for_each_entry_rcu(table, &afi->tables, list) {
2105 if (ctx && ctx->table &&
2106 strcmp(ctx->table, table->name) != 0)
2107 continue;
2108
2109 list_for_each_entry_rcu(chain, &table->chains, list) {
2110 if (ctx && ctx->chain[0] &&
2111 strcmp(ctx->chain, chain->name) != 0)
2112 continue;
2113
2114 list_for_each_entry_rcu(rule, &chain->rules, list) {
2115 if (!nft_is_active(net, rule))
2116 goto cont;
2117 if (idx < s_idx)
2118 goto cont;
2119 if (idx > s_idx)
2120 memset(&cb->args[1], 0,
2121 sizeof(cb->args) - sizeof(cb->args[0]));
2122 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2123 cb->nlh->nlmsg_seq,
2124 NFT_MSG_NEWRULE,
2125 NLM_F_MULTI | NLM_F_APPEND,
2126 afi->family, table, chain, rule) < 0)
2127 goto done;
2128
2129 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2130 cont:
2131 idx++;
2132 }
2133 }
2134 }
2135 }
2136 done:
2137 rcu_read_unlock();
2138
2139 cb->args[0] = idx;
2140 return skb->len;
2141 }
2142
2143 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2144 {
2145 struct nft_rule_dump_ctx *ctx = cb->data;
2146
2147 if (ctx) {
2148 kfree(ctx->table);
2149 kfree(ctx->chain);
2150 kfree(ctx);
2151 }
2152 return 0;
2153 }
2154
2155 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2156 struct sk_buff *skb, const struct nlmsghdr *nlh,
2157 const struct nlattr * const nla[],
2158 struct netlink_ext_ack *extack)
2159 {
2160 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2161 u8 genmask = nft_genmask_cur(net);
2162 const struct nft_af_info *afi;
2163 const struct nft_table *table;
2164 const struct nft_chain *chain;
2165 const struct nft_rule *rule;
2166 struct sk_buff *skb2;
2167 int family = nfmsg->nfgen_family;
2168 int err;
2169
2170 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2171 struct netlink_dump_control c = {
2172 .dump = nf_tables_dump_rules,
2173 .done = nf_tables_dump_rules_done,
2174 };
2175
2176 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2177 struct nft_rule_dump_ctx *ctx;
2178
2179 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
2180 if (!ctx)
2181 return -ENOMEM;
2182
2183 if (nla[NFTA_RULE_TABLE]) {
2184 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2185 GFP_KERNEL);
2186 if (!ctx->table) {
2187 kfree(ctx);
2188 return -ENOMEM;
2189 }
2190 }
2191 if (nla[NFTA_RULE_CHAIN]) {
2192 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2193 GFP_KERNEL);
2194 if (!ctx->chain) {
2195 kfree(ctx->table);
2196 kfree(ctx);
2197 return -ENOMEM;
2198 }
2199 }
2200 c.data = ctx;
2201 }
2202
2203 return netlink_dump_start(nlsk, skb, nlh, &c);
2204 }
2205
2206 afi = nf_tables_afinfo_lookup(net, family, false);
2207 if (IS_ERR(afi))
2208 return PTR_ERR(afi);
2209
2210 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2211 if (IS_ERR(table))
2212 return PTR_ERR(table);
2213
2214 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2215 if (IS_ERR(chain))
2216 return PTR_ERR(chain);
2217
2218 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2219 if (IS_ERR(rule))
2220 return PTR_ERR(rule);
2221
2222 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2223 if (!skb2)
2224 return -ENOMEM;
2225
2226 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
2227 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
2228 family, table, chain, rule);
2229 if (err < 0)
2230 goto err;
2231
2232 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2233
2234 err:
2235 kfree_skb(skb2);
2236 return err;
2237 }
2238
2239 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
2240 struct nft_rule *rule)
2241 {
2242 struct nft_expr *expr;
2243
2244 /*
2245 * Careful: some expressions might not be initialized in case this
2246 * is called on error from nf_tables_newrule().
2247 */
2248 expr = nft_expr_first(rule);
2249 while (expr != nft_expr_last(rule) && expr->ops) {
2250 nf_tables_expr_destroy(ctx, expr);
2251 expr = nft_expr_next(expr);
2252 }
2253 kfree(rule);
2254 }
2255
2256 #define NFT_RULE_MAXEXPRS 128
2257
2258 static struct nft_expr_info *info;
2259
2260 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
2261 struct sk_buff *skb, const struct nlmsghdr *nlh,
2262 const struct nlattr * const nla[],
2263 struct netlink_ext_ack *extack)
2264 {
2265 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2266 u8 genmask = nft_genmask_next(net);
2267 struct nft_af_info *afi;
2268 struct nft_table *table;
2269 struct nft_chain *chain;
2270 struct nft_rule *rule, *old_rule = NULL;
2271 struct nft_userdata *udata;
2272 struct nft_trans *trans = NULL;
2273 struct nft_expr *expr;
2274 struct nft_ctx ctx;
2275 struct nlattr *tmp;
2276 unsigned int size, i, n, ulen = 0, usize = 0;
2277 int err, rem;
2278 bool create;
2279 u64 handle, pos_handle;
2280
2281 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2282
2283 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2284 if (IS_ERR(afi))
2285 return PTR_ERR(afi);
2286
2287 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2288 if (IS_ERR(table))
2289 return PTR_ERR(table);
2290
2291 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN], genmask);
2292 if (IS_ERR(chain))
2293 return PTR_ERR(chain);
2294
2295 if (nla[NFTA_RULE_HANDLE]) {
2296 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
2297 rule = __nf_tables_rule_lookup(chain, handle);
2298 if (IS_ERR(rule))
2299 return PTR_ERR(rule);
2300
2301 if (nlh->nlmsg_flags & NLM_F_EXCL)
2302 return -EEXIST;
2303 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2304 old_rule = rule;
2305 else
2306 return -EOPNOTSUPP;
2307 } else {
2308 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
2309 return -EINVAL;
2310 handle = nf_tables_alloc_handle(table);
2311
2312 if (chain->use == UINT_MAX)
2313 return -EOVERFLOW;
2314 }
2315
2316 if (nla[NFTA_RULE_POSITION]) {
2317 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2318 return -EOPNOTSUPP;
2319
2320 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
2321 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
2322 if (IS_ERR(old_rule))
2323 return PTR_ERR(old_rule);
2324 }
2325
2326 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2327
2328 n = 0;
2329 size = 0;
2330 if (nla[NFTA_RULE_EXPRESSIONS]) {
2331 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
2332 err = -EINVAL;
2333 if (nla_type(tmp) != NFTA_LIST_ELEM)
2334 goto err1;
2335 if (n == NFT_RULE_MAXEXPRS)
2336 goto err1;
2337 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
2338 if (err < 0)
2339 goto err1;
2340 size += info[n].ops->size;
2341 n++;
2342 }
2343 }
2344 /* Check for overflow of dlen field */
2345 err = -EFBIG;
2346 if (size >= 1 << 12)
2347 goto err1;
2348
2349 if (nla[NFTA_RULE_USERDATA]) {
2350 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
2351 if (ulen > 0)
2352 usize = sizeof(struct nft_userdata) + ulen;
2353 }
2354
2355 err = -ENOMEM;
2356 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
2357 if (rule == NULL)
2358 goto err1;
2359
2360 nft_activate_next(net, rule);
2361
2362 rule->handle = handle;
2363 rule->dlen = size;
2364 rule->udata = ulen ? 1 : 0;
2365
2366 if (ulen) {
2367 udata = nft_userdata(rule);
2368 udata->len = ulen - 1;
2369 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
2370 }
2371
2372 expr = nft_expr_first(rule);
2373 for (i = 0; i < n; i++) {
2374 err = nf_tables_newexpr(&ctx, &info[i], expr);
2375 if (err < 0)
2376 goto err2;
2377 info[i].ops = NULL;
2378 expr = nft_expr_next(expr);
2379 }
2380
2381 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2382 if (nft_is_active_next(net, old_rule)) {
2383 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
2384 old_rule);
2385 if (trans == NULL) {
2386 err = -ENOMEM;
2387 goto err2;
2388 }
2389 nft_deactivate_next(net, old_rule);
2390 chain->use--;
2391 list_add_tail_rcu(&rule->list, &old_rule->list);
2392 } else {
2393 err = -ENOENT;
2394 goto err2;
2395 }
2396 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
2397 if (old_rule)
2398 list_add_rcu(&rule->list, &old_rule->list);
2399 else
2400 list_add_tail_rcu(&rule->list, &chain->rules);
2401 else {
2402 if (old_rule)
2403 list_add_tail_rcu(&rule->list, &old_rule->list);
2404 else
2405 list_add_rcu(&rule->list, &chain->rules);
2406 }
2407
2408 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
2409 err = -ENOMEM;
2410 goto err3;
2411 }
2412 chain->use++;
2413 return 0;
2414
2415 err3:
2416 list_del_rcu(&rule->list);
2417 err2:
2418 nf_tables_rule_destroy(&ctx, rule);
2419 err1:
2420 for (i = 0; i < n; i++) {
2421 if (info[i].ops != NULL)
2422 module_put(info[i].ops->type->owner);
2423 }
2424 return err;
2425 }
2426
2427 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
2428 const struct nlattr *nla)
2429 {
2430 u32 id = ntohl(nla_get_be32(nla));
2431 struct nft_trans *trans;
2432
2433 list_for_each_entry(trans, &net->nft.commit_list, list) {
2434 struct nft_rule *rule = nft_trans_rule(trans);
2435
2436 if (trans->msg_type == NFT_MSG_NEWRULE &&
2437 id == nft_trans_rule_id(trans))
2438 return rule;
2439 }
2440 return ERR_PTR(-ENOENT);
2441 }
2442
2443 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
2444 struct sk_buff *skb, const struct nlmsghdr *nlh,
2445 const struct nlattr * const nla[],
2446 struct netlink_ext_ack *extack)
2447 {
2448 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2449 u8 genmask = nft_genmask_next(net);
2450 struct nft_af_info *afi;
2451 struct nft_table *table;
2452 struct nft_chain *chain = NULL;
2453 struct nft_rule *rule;
2454 int family = nfmsg->nfgen_family, err = 0;
2455 struct nft_ctx ctx;
2456
2457 afi = nf_tables_afinfo_lookup(net, family, false);
2458 if (IS_ERR(afi))
2459 return PTR_ERR(afi);
2460
2461 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE], genmask);
2462 if (IS_ERR(table))
2463 return PTR_ERR(table);
2464
2465 if (nla[NFTA_RULE_CHAIN]) {
2466 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN],
2467 genmask);
2468 if (IS_ERR(chain))
2469 return PTR_ERR(chain);
2470 }
2471
2472 nft_ctx_init(&ctx, net, skb, nlh, afi, table, chain, nla);
2473
2474 if (chain) {
2475 if (nla[NFTA_RULE_HANDLE]) {
2476 rule = nf_tables_rule_lookup(chain,
2477 nla[NFTA_RULE_HANDLE]);
2478 if (IS_ERR(rule))
2479 return PTR_ERR(rule);
2480
2481 err = nft_delrule(&ctx, rule);
2482 } else if (nla[NFTA_RULE_ID]) {
2483 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
2484 if (IS_ERR(rule))
2485 return PTR_ERR(rule);
2486
2487 err = nft_delrule(&ctx, rule);
2488 } else {
2489 err = nft_delrule_by_chain(&ctx);
2490 }
2491 } else {
2492 list_for_each_entry(chain, &table->chains, list) {
2493 if (!nft_is_active_next(net, chain))
2494 continue;
2495
2496 ctx.chain = chain;
2497 err = nft_delrule_by_chain(&ctx);
2498 if (err < 0)
2499 break;
2500 }
2501 }
2502
2503 return err;
2504 }
2505
2506 /*
2507 * Sets
2508 */
2509
2510 static LIST_HEAD(nf_tables_set_types);
2511
2512 int nft_register_set(struct nft_set_type *type)
2513 {
2514 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2515 list_add_tail_rcu(&type->list, &nf_tables_set_types);
2516 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2517 return 0;
2518 }
2519 EXPORT_SYMBOL_GPL(nft_register_set);
2520
2521 void nft_unregister_set(struct nft_set_type *type)
2522 {
2523 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2524 list_del_rcu(&type->list);
2525 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2526 }
2527 EXPORT_SYMBOL_GPL(nft_unregister_set);
2528
2529 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
2530 NFT_SET_TIMEOUT | NFT_SET_OBJECT)
2531
2532 static bool nft_set_ops_candidate(const struct nft_set_ops *ops, u32 flags)
2533 {
2534 return (flags & ops->features) == (flags & NFT_SET_FEATURES);
2535 }
2536
2537 /*
2538 * Select a set implementation based on the data characteristics and the
2539 * given policy. The total memory use might not be known if no size is
2540 * given, in that case the amount of memory per element is used.
2541 */
2542 static const struct nft_set_ops *
2543 nft_select_set_ops(const struct nft_ctx *ctx,
2544 const struct nlattr * const nla[],
2545 const struct nft_set_desc *desc,
2546 enum nft_set_policies policy)
2547 {
2548 const struct nft_set_ops *ops, *bops;
2549 struct nft_set_estimate est, best;
2550 const struct nft_set_type *type;
2551 u32 flags = 0;
2552
2553 #ifdef CONFIG_MODULES
2554 if (list_empty(&nf_tables_set_types)) {
2555 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2556 request_module("nft-set");
2557 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2558 if (!list_empty(&nf_tables_set_types))
2559 return ERR_PTR(-EAGAIN);
2560 }
2561 #endif
2562 if (nla[NFTA_SET_FLAGS] != NULL)
2563 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2564
2565 bops = NULL;
2566 best.size = ~0;
2567 best.lookup = ~0;
2568 best.space = ~0;
2569
2570 list_for_each_entry(type, &nf_tables_set_types, list) {
2571 if (!type->select_ops)
2572 ops = type->ops;
2573 else
2574 ops = type->select_ops(ctx, desc, flags);
2575 if (!ops)
2576 continue;
2577
2578 if (!nft_set_ops_candidate(ops, flags))
2579 continue;
2580 if (!ops->estimate(desc, flags, &est))
2581 continue;
2582
2583 switch (policy) {
2584 case NFT_SET_POL_PERFORMANCE:
2585 if (est.lookup < best.lookup)
2586 break;
2587 if (est.lookup == best.lookup &&
2588 est.space < best.space)
2589 break;
2590 continue;
2591 case NFT_SET_POL_MEMORY:
2592 if (!desc->size) {
2593 if (est.space < best.space)
2594 break;
2595 if (est.space == best.space &&
2596 est.lookup < best.lookup)
2597 break;
2598 } else if (est.size < best.size) {
2599 break;
2600 }
2601 continue;
2602 default:
2603 break;
2604 }
2605
2606 if (!try_module_get(type->owner))
2607 continue;
2608 if (bops != NULL)
2609 module_put(bops->type->owner);
2610
2611 bops = ops;
2612 best = est;
2613 }
2614
2615 if (bops != NULL)
2616 return bops;
2617
2618 return ERR_PTR(-EOPNOTSUPP);
2619 }
2620
2621 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2622 [NFTA_SET_TABLE] = { .type = NLA_STRING,
2623 .len = NFT_TABLE_MAXNAMELEN - 1 },
2624 [NFTA_SET_NAME] = { .type = NLA_STRING,
2625 .len = NFT_SET_MAXNAMELEN - 1 },
2626 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2627 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2628 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2629 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2630 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2631 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2632 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2633 [NFTA_SET_ID] = { .type = NLA_U32 },
2634 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
2635 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
2636 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
2637 .len = NFT_USERDATA_MAXLEN },
2638 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
2639 };
2640
2641 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2642 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2643 };
2644
2645 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
2646 const struct sk_buff *skb,
2647 const struct nlmsghdr *nlh,
2648 const struct nlattr * const nla[],
2649 u8 genmask)
2650 {
2651 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2652 struct nft_af_info *afi = NULL;
2653 struct nft_table *table = NULL;
2654
2655 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2656 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2657 if (IS_ERR(afi))
2658 return PTR_ERR(afi);
2659 }
2660
2661 if (nla[NFTA_SET_TABLE] != NULL) {
2662 if (afi == NULL)
2663 return -EAFNOSUPPORT;
2664
2665 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE],
2666 genmask);
2667 if (IS_ERR(table))
2668 return PTR_ERR(table);
2669 }
2670
2671 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
2672 return 0;
2673 }
2674
2675 static struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2676 const struct nlattr *nla, u8 genmask)
2677 {
2678 struct nft_set *set;
2679
2680 if (nla == NULL)
2681 return ERR_PTR(-EINVAL);
2682
2683 list_for_each_entry(set, &table->sets, list) {
2684 if (!nla_strcmp(nla, set->name) &&
2685 nft_active_genmask(set, genmask))
2686 return set;
2687 }
2688 return ERR_PTR(-ENOENT);
2689 }
2690
2691 static struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2692 const struct nlattr *nla,
2693 u8 genmask)
2694 {
2695 struct nft_trans *trans;
2696 u32 id = ntohl(nla_get_be32(nla));
2697
2698 list_for_each_entry(trans, &net->nft.commit_list, list) {
2699 struct nft_set *set = nft_trans_set(trans);
2700
2701 if (trans->msg_type == NFT_MSG_NEWSET &&
2702 id == nft_trans_set_id(trans) &&
2703 nft_active_genmask(set, genmask))
2704 return set;
2705 }
2706 return ERR_PTR(-ENOENT);
2707 }
2708
2709 struct nft_set *nft_set_lookup(const struct net *net,
2710 const struct nft_table *table,
2711 const struct nlattr *nla_set_name,
2712 const struct nlattr *nla_set_id,
2713 u8 genmask)
2714 {
2715 struct nft_set *set;
2716
2717 set = nf_tables_set_lookup(table, nla_set_name, genmask);
2718 if (IS_ERR(set)) {
2719 if (!nla_set_id)
2720 return set;
2721
2722 set = nf_tables_set_lookup_byid(net, nla_set_id, genmask);
2723 }
2724 return set;
2725 }
2726 EXPORT_SYMBOL_GPL(nft_set_lookup);
2727
2728 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2729 const char *name)
2730 {
2731 const struct nft_set *i;
2732 const char *p;
2733 unsigned long *inuse;
2734 unsigned int n = 0, min = 0;
2735
2736 p = strchr(name, '%');
2737 if (p != NULL) {
2738 if (p[1] != 'd' || strchr(p + 2, '%'))
2739 return -EINVAL;
2740
2741 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2742 if (inuse == NULL)
2743 return -ENOMEM;
2744 cont:
2745 list_for_each_entry(i, &ctx->table->sets, list) {
2746 int tmp;
2747
2748 if (!nft_is_active_next(ctx->net, set))
2749 continue;
2750 if (!sscanf(i->name, name, &tmp))
2751 continue;
2752 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2753 continue;
2754
2755 set_bit(tmp - min, inuse);
2756 }
2757
2758 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2759 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2760 min += BITS_PER_BYTE * PAGE_SIZE;
2761 memset(inuse, 0, PAGE_SIZE);
2762 goto cont;
2763 }
2764 free_page((unsigned long)inuse);
2765 }
2766
2767 set->name = kasprintf(GFP_KERNEL, name, min + n);
2768 if (!set->name)
2769 return -ENOMEM;
2770
2771 list_for_each_entry(i, &ctx->table->sets, list) {
2772 if (!nft_is_active_next(ctx->net, i))
2773 continue;
2774 if (!strcmp(set->name, i->name)) {
2775 kfree(set->name);
2776 return -ENFILE;
2777 }
2778 }
2779 return 0;
2780 }
2781
2782 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2783 const struct nft_set *set, u16 event, u16 flags)
2784 {
2785 struct nfgenmsg *nfmsg;
2786 struct nlmsghdr *nlh;
2787 struct nlattr *desc;
2788 u32 portid = ctx->portid;
2789 u32 seq = ctx->seq;
2790
2791 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2792 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2793 flags);
2794 if (nlh == NULL)
2795 goto nla_put_failure;
2796
2797 nfmsg = nlmsg_data(nlh);
2798 nfmsg->nfgen_family = ctx->afi->family;
2799 nfmsg->version = NFNETLINK_V0;
2800 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
2801
2802 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2803 goto nla_put_failure;
2804 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2805 goto nla_put_failure;
2806 if (set->flags != 0)
2807 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2808 goto nla_put_failure;
2809
2810 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2811 goto nla_put_failure;
2812 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2813 goto nla_put_failure;
2814 if (set->flags & NFT_SET_MAP) {
2815 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2816 goto nla_put_failure;
2817 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2818 goto nla_put_failure;
2819 }
2820 if (set->flags & NFT_SET_OBJECT &&
2821 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
2822 goto nla_put_failure;
2823
2824 if (set->timeout &&
2825 nla_put_be64(skb, NFTA_SET_TIMEOUT,
2826 cpu_to_be64(jiffies_to_msecs(set->timeout)),
2827 NFTA_SET_PAD))
2828 goto nla_put_failure;
2829 if (set->gc_int &&
2830 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
2831 goto nla_put_failure;
2832
2833 if (set->policy != NFT_SET_POL_PERFORMANCE) {
2834 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
2835 goto nla_put_failure;
2836 }
2837
2838 if (nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
2839 goto nla_put_failure;
2840
2841 desc = nla_nest_start(skb, NFTA_SET_DESC);
2842 if (desc == NULL)
2843 goto nla_put_failure;
2844 if (set->size &&
2845 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2846 goto nla_put_failure;
2847 nla_nest_end(skb, desc);
2848
2849 nlmsg_end(skb, nlh);
2850 return 0;
2851
2852 nla_put_failure:
2853 nlmsg_trim(skb, nlh);
2854 return -1;
2855 }
2856
2857 static void nf_tables_set_notify(const struct nft_ctx *ctx,
2858 const struct nft_set *set, int event,
2859 gfp_t gfp_flags)
2860 {
2861 struct sk_buff *skb;
2862 u32 portid = ctx->portid;
2863 int err;
2864
2865 if (!ctx->report &&
2866 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2867 return;
2868
2869 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2870 if (skb == NULL)
2871 goto err;
2872
2873 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2874 if (err < 0) {
2875 kfree_skb(skb);
2876 goto err;
2877 }
2878
2879 nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
2880 gfp_flags);
2881 return;
2882 err:
2883 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
2884 }
2885
2886 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2887 {
2888 const struct nft_set *set;
2889 unsigned int idx, s_idx = cb->args[0];
2890 struct nft_af_info *afi;
2891 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2892 struct net *net = sock_net(skb->sk);
2893 int cur_family = cb->args[3];
2894 struct nft_ctx *ctx = cb->data, ctx_set;
2895
2896 if (cb->args[1])
2897 return skb->len;
2898
2899 rcu_read_lock();
2900 cb->seq = net->nft.base_seq;
2901
2902 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2903 if (ctx->afi && ctx->afi != afi)
2904 continue;
2905
2906 if (cur_family) {
2907 if (afi->family != cur_family)
2908 continue;
2909
2910 cur_family = 0;
2911 }
2912 list_for_each_entry_rcu(table, &afi->tables, list) {
2913 if (ctx->table && ctx->table != table)
2914 continue;
2915
2916 if (cur_table) {
2917 if (cur_table != table)
2918 continue;
2919
2920 cur_table = NULL;
2921 }
2922 idx = 0;
2923 list_for_each_entry_rcu(set, &table->sets, list) {
2924 if (idx < s_idx)
2925 goto cont;
2926 if (!nft_is_active(net, set))
2927 goto cont;
2928
2929 ctx_set = *ctx;
2930 ctx_set.table = table;
2931 ctx_set.afi = afi;
2932 if (nf_tables_fill_set(skb, &ctx_set, set,
2933 NFT_MSG_NEWSET,
2934 NLM_F_MULTI) < 0) {
2935 cb->args[0] = idx;
2936 cb->args[2] = (unsigned long) table;
2937 cb->args[3] = afi->family;
2938 goto done;
2939 }
2940 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2941 cont:
2942 idx++;
2943 }
2944 if (s_idx)
2945 s_idx = 0;
2946 }
2947 }
2948 cb->args[1] = 1;
2949 done:
2950 rcu_read_unlock();
2951 return skb->len;
2952 }
2953
2954 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2955 {
2956 kfree(cb->data);
2957 return 0;
2958 }
2959
2960 static int nf_tables_getset(struct net *net, struct sock *nlsk,
2961 struct sk_buff *skb, const struct nlmsghdr *nlh,
2962 const struct nlattr * const nla[],
2963 struct netlink_ext_ack *extack)
2964 {
2965 u8 genmask = nft_genmask_cur(net);
2966 const struct nft_set *set;
2967 struct nft_ctx ctx;
2968 struct sk_buff *skb2;
2969 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2970 int err;
2971
2972 /* Verify existence before starting dump */
2973 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
2974 if (err < 0)
2975 return err;
2976
2977 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2978 struct netlink_dump_control c = {
2979 .dump = nf_tables_dump_sets,
2980 .done = nf_tables_dump_sets_done,
2981 };
2982 struct nft_ctx *ctx_dump;
2983
2984 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2985 if (ctx_dump == NULL)
2986 return -ENOMEM;
2987
2988 *ctx_dump = ctx;
2989 c.data = ctx_dump;
2990
2991 return netlink_dump_start(nlsk, skb, nlh, &c);
2992 }
2993
2994 /* Only accept unspec with dump */
2995 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2996 return -EAFNOSUPPORT;
2997 if (!nla[NFTA_SET_TABLE])
2998 return -EINVAL;
2999
3000 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3001 if (IS_ERR(set))
3002 return PTR_ERR(set);
3003
3004 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3005 if (skb2 == NULL)
3006 return -ENOMEM;
3007
3008 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3009 if (err < 0)
3010 goto err;
3011
3012 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
3013
3014 err:
3015 kfree_skb(skb2);
3016 return err;
3017 }
3018
3019 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
3020 struct nft_set_desc *desc,
3021 const struct nlattr *nla)
3022 {
3023 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
3024 int err;
3025
3026 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla,
3027 nft_set_desc_policy, NULL);
3028 if (err < 0)
3029 return err;
3030
3031 if (da[NFTA_SET_DESC_SIZE] != NULL)
3032 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
3033
3034 return 0;
3035 }
3036
3037 static int nf_tables_newset(struct net *net, struct sock *nlsk,
3038 struct sk_buff *skb, const struct nlmsghdr *nlh,
3039 const struct nlattr * const nla[],
3040 struct netlink_ext_ack *extack)
3041 {
3042 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3043 u8 genmask = nft_genmask_next(net);
3044 const struct nft_set_ops *ops;
3045 struct nft_af_info *afi;
3046 struct nft_table *table;
3047 struct nft_set *set;
3048 struct nft_ctx ctx;
3049 char *name;
3050 unsigned int size;
3051 bool create;
3052 u64 timeout;
3053 u32 ktype, dtype, flags, policy, gc_int, objtype;
3054 struct nft_set_desc desc;
3055 unsigned char *udata;
3056 u16 udlen;
3057 int err;
3058
3059 if (nla[NFTA_SET_TABLE] == NULL ||
3060 nla[NFTA_SET_NAME] == NULL ||
3061 nla[NFTA_SET_KEY_LEN] == NULL ||
3062 nla[NFTA_SET_ID] == NULL)
3063 return -EINVAL;
3064
3065 memset(&desc, 0, sizeof(desc));
3066
3067 ktype = NFT_DATA_VALUE;
3068 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
3069 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
3070 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
3071 return -EINVAL;
3072 }
3073
3074 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
3075 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
3076 return -EINVAL;
3077
3078 flags = 0;
3079 if (nla[NFTA_SET_FLAGS] != NULL) {
3080 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3081 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
3082 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
3083 NFT_SET_MAP | NFT_SET_EVAL |
3084 NFT_SET_OBJECT))
3085 return -EINVAL;
3086 /* Only one of these operations is supported */
3087 if ((flags & (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT)) ==
3088 (NFT_SET_MAP | NFT_SET_EVAL | NFT_SET_OBJECT))
3089 return -EOPNOTSUPP;
3090 }
3091
3092 dtype = 0;
3093 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
3094 if (!(flags & NFT_SET_MAP))
3095 return -EINVAL;
3096
3097 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
3098 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
3099 dtype != NFT_DATA_VERDICT)
3100 return -EINVAL;
3101
3102 if (dtype != NFT_DATA_VERDICT) {
3103 if (nla[NFTA_SET_DATA_LEN] == NULL)
3104 return -EINVAL;
3105 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
3106 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
3107 return -EINVAL;
3108 } else
3109 desc.dlen = sizeof(struct nft_verdict);
3110 } else if (flags & NFT_SET_MAP)
3111 return -EINVAL;
3112
3113 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
3114 if (!(flags & NFT_SET_OBJECT))
3115 return -EINVAL;
3116
3117 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
3118 if (objtype == NFT_OBJECT_UNSPEC ||
3119 objtype > NFT_OBJECT_MAX)
3120 return -EINVAL;
3121 } else if (flags & NFT_SET_OBJECT)
3122 return -EINVAL;
3123 else
3124 objtype = NFT_OBJECT_UNSPEC;
3125
3126 timeout = 0;
3127 if (nla[NFTA_SET_TIMEOUT] != NULL) {
3128 if (!(flags & NFT_SET_TIMEOUT))
3129 return -EINVAL;
3130 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3131 nla[NFTA_SET_TIMEOUT])));
3132 }
3133 gc_int = 0;
3134 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
3135 if (!(flags & NFT_SET_TIMEOUT))
3136 return -EINVAL;
3137 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
3138 }
3139
3140 policy = NFT_SET_POL_PERFORMANCE;
3141 if (nla[NFTA_SET_POLICY] != NULL)
3142 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
3143
3144 if (nla[NFTA_SET_DESC] != NULL) {
3145 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
3146 if (err < 0)
3147 return err;
3148 }
3149
3150 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
3151
3152 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
3153 if (IS_ERR(afi))
3154 return PTR_ERR(afi);
3155
3156 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE], genmask);
3157 if (IS_ERR(table))
3158 return PTR_ERR(table);
3159
3160 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
3161
3162 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME], genmask);
3163 if (IS_ERR(set)) {
3164 if (PTR_ERR(set) != -ENOENT)
3165 return PTR_ERR(set);
3166 } else {
3167 if (nlh->nlmsg_flags & NLM_F_EXCL)
3168 return -EEXIST;
3169 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3170 return -EOPNOTSUPP;
3171 return 0;
3172 }
3173
3174 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
3175 return -ENOENT;
3176
3177 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
3178 if (IS_ERR(ops))
3179 return PTR_ERR(ops);
3180
3181 udlen = 0;
3182 if (nla[NFTA_SET_USERDATA])
3183 udlen = nla_len(nla[NFTA_SET_USERDATA]);
3184
3185 size = 0;
3186 if (ops->privsize != NULL)
3187 size = ops->privsize(nla, &desc);
3188
3189 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
3190 if (!set) {
3191 err = -ENOMEM;
3192 goto err1;
3193 }
3194
3195 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
3196 if (!name) {
3197 err = -ENOMEM;
3198 goto err2;
3199 }
3200
3201 err = nf_tables_set_alloc_name(&ctx, set, name);
3202 kfree(name);
3203 if (err < 0)
3204 goto err2;
3205
3206 udata = NULL;
3207 if (udlen) {
3208 udata = set->data + size;
3209 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
3210 }
3211
3212 INIT_LIST_HEAD(&set->bindings);
3213 set->ops = ops;
3214 set->ktype = ktype;
3215 set->klen = desc.klen;
3216 set->dtype = dtype;
3217 set->objtype = objtype;
3218 set->dlen = desc.dlen;
3219 set->flags = flags;
3220 set->size = desc.size;
3221 set->policy = policy;
3222 set->udlen = udlen;
3223 set->udata = udata;
3224 set->timeout = timeout;
3225 set->gc_int = gc_int;
3226
3227 err = ops->init(set, &desc, nla);
3228 if (err < 0)
3229 goto err2;
3230
3231 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
3232 if (err < 0)
3233 goto err3;
3234
3235 list_add_tail_rcu(&set->list, &table->sets);
3236 table->use++;
3237 return 0;
3238
3239 err3:
3240 ops->destroy(set);
3241 err2:
3242 kvfree(set);
3243 err1:
3244 module_put(ops->type->owner);
3245 return err;
3246 }
3247
3248 static void nft_set_destroy(struct nft_set *set)
3249 {
3250 set->ops->destroy(set);
3251 module_put(set->ops->type->owner);
3252 kfree(set->name);
3253 kvfree(set);
3254 }
3255
3256 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
3257 {
3258 list_del_rcu(&set->list);
3259 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
3260 nft_set_destroy(set);
3261 }
3262
3263 static int nf_tables_delset(struct net *net, struct sock *nlsk,
3264 struct sk_buff *skb, const struct nlmsghdr *nlh,
3265 const struct nlattr * const nla[],
3266 struct netlink_ext_ack *extack)
3267 {
3268 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3269 u8 genmask = nft_genmask_next(net);
3270 struct nft_set *set;
3271 struct nft_ctx ctx;
3272 int err;
3273
3274 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3275 return -EAFNOSUPPORT;
3276 if (nla[NFTA_SET_TABLE] == NULL)
3277 return -EINVAL;
3278
3279 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, genmask);
3280 if (err < 0)
3281 return err;
3282
3283 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3284 if (IS_ERR(set))
3285 return PTR_ERR(set);
3286
3287 if (!list_empty(&set->bindings) ||
3288 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0))
3289 return -EBUSY;
3290
3291 return nft_delset(&ctx, set);
3292 }
3293
3294 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
3295 struct nft_set *set,
3296 const struct nft_set_iter *iter,
3297 struct nft_set_elem *elem)
3298 {
3299 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3300 enum nft_registers dreg;
3301
3302 dreg = nft_type_to_reg(set->dtype);
3303 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
3304 set->dtype == NFT_DATA_VERDICT ?
3305 NFT_DATA_VERDICT : NFT_DATA_VALUE,
3306 set->dlen);
3307 }
3308
3309 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
3310 struct nft_set_binding *binding)
3311 {
3312 struct nft_set_binding *i;
3313 struct nft_set_iter iter;
3314
3315 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
3316 return -EBUSY;
3317
3318 if (binding->flags & NFT_SET_MAP) {
3319 /* If the set is already bound to the same chain all
3320 * jumps are already validated for that chain.
3321 */
3322 list_for_each_entry(i, &set->bindings, list) {
3323 if (i->flags & NFT_SET_MAP &&
3324 i->chain == binding->chain)
3325 goto bind;
3326 }
3327
3328 iter.genmask = nft_genmask_next(ctx->net);
3329 iter.skip = 0;
3330 iter.count = 0;
3331 iter.err = 0;
3332 iter.fn = nf_tables_bind_check_setelem;
3333
3334 set->ops->walk(ctx, set, &iter);
3335 if (iter.err < 0)
3336 return iter.err;
3337 }
3338 bind:
3339 binding->chain = ctx->chain;
3340 list_add_tail_rcu(&binding->list, &set->bindings);
3341 return 0;
3342 }
3343 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
3344
3345 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
3346 struct nft_set_binding *binding)
3347 {
3348 list_del_rcu(&binding->list);
3349
3350 if (list_empty(&set->bindings) && nft_set_is_anonymous(set) &&
3351 nft_is_active(ctx->net, set))
3352 nf_tables_set_destroy(ctx, set);
3353 }
3354 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
3355
3356 const struct nft_set_ext_type nft_set_ext_types[] = {
3357 [NFT_SET_EXT_KEY] = {
3358 .align = __alignof__(u32),
3359 },
3360 [NFT_SET_EXT_DATA] = {
3361 .align = __alignof__(u32),
3362 },
3363 [NFT_SET_EXT_EXPR] = {
3364 .align = __alignof__(struct nft_expr),
3365 },
3366 [NFT_SET_EXT_OBJREF] = {
3367 .len = sizeof(struct nft_object *),
3368 .align = __alignof__(struct nft_object *),
3369 },
3370 [NFT_SET_EXT_FLAGS] = {
3371 .len = sizeof(u8),
3372 .align = __alignof__(u8),
3373 },
3374 [NFT_SET_EXT_TIMEOUT] = {
3375 .len = sizeof(u64),
3376 .align = __alignof__(u64),
3377 },
3378 [NFT_SET_EXT_EXPIRATION] = {
3379 .len = sizeof(unsigned long),
3380 .align = __alignof__(unsigned long),
3381 },
3382 [NFT_SET_EXT_USERDATA] = {
3383 .len = sizeof(struct nft_userdata),
3384 .align = __alignof__(struct nft_userdata),
3385 },
3386 };
3387 EXPORT_SYMBOL_GPL(nft_set_ext_types);
3388
3389 /*
3390 * Set elements
3391 */
3392
3393 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
3394 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
3395 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
3396 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
3397 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
3398 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
3399 .len = NFT_USERDATA_MAXLEN },
3400 };
3401
3402 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
3403 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
3404 .len = NFT_TABLE_MAXNAMELEN - 1 },
3405 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
3406 .len = NFT_SET_MAXNAMELEN - 1 },
3407 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
3408 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
3409 };
3410
3411 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
3412 const struct sk_buff *skb,
3413 const struct nlmsghdr *nlh,
3414 const struct nlattr * const nla[],
3415 u8 genmask)
3416 {
3417 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3418 struct nft_af_info *afi;
3419 struct nft_table *table;
3420
3421 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
3422 if (IS_ERR(afi))
3423 return PTR_ERR(afi);
3424
3425 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE],
3426 genmask);
3427 if (IS_ERR(table))
3428 return PTR_ERR(table);
3429
3430 nft_ctx_init(ctx, net, skb, nlh, afi, table, NULL, nla);
3431 return 0;
3432 }
3433
3434 static int nf_tables_fill_setelem(struct sk_buff *skb,
3435 const struct nft_set *set,
3436 const struct nft_set_elem *elem)
3437 {
3438 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3439 unsigned char *b = skb_tail_pointer(skb);
3440 struct nlattr *nest;
3441
3442 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
3443 if (nest == NULL)
3444 goto nla_put_failure;
3445
3446 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
3447 NFT_DATA_VALUE, set->klen) < 0)
3448 goto nla_put_failure;
3449
3450 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
3451 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
3452 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
3453 set->dlen) < 0)
3454 goto nla_put_failure;
3455
3456 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
3457 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
3458 goto nla_put_failure;
3459
3460 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
3461 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
3462 (*nft_set_ext_obj(ext))->name) < 0)
3463 goto nla_put_failure;
3464
3465 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3466 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
3467 htonl(*nft_set_ext_flags(ext))))
3468 goto nla_put_failure;
3469
3470 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
3471 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
3472 cpu_to_be64(jiffies_to_msecs(
3473 *nft_set_ext_timeout(ext))),
3474 NFTA_SET_ELEM_PAD))
3475 goto nla_put_failure;
3476
3477 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
3478 unsigned long expires, now = jiffies;
3479
3480 expires = *nft_set_ext_expiration(ext);
3481 if (time_before(now, expires))
3482 expires -= now;
3483 else
3484 expires = 0;
3485
3486 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
3487 cpu_to_be64(jiffies_to_msecs(expires)),
3488 NFTA_SET_ELEM_PAD))
3489 goto nla_put_failure;
3490 }
3491
3492 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
3493 struct nft_userdata *udata;
3494
3495 udata = nft_set_ext_userdata(ext);
3496 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
3497 udata->len + 1, udata->data))
3498 goto nla_put_failure;
3499 }
3500
3501 nla_nest_end(skb, nest);
3502 return 0;
3503
3504 nla_put_failure:
3505 nlmsg_trim(skb, b);
3506 return -EMSGSIZE;
3507 }
3508
3509 struct nft_set_dump_args {
3510 const struct netlink_callback *cb;
3511 struct nft_set_iter iter;
3512 struct sk_buff *skb;
3513 };
3514
3515 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
3516 struct nft_set *set,
3517 const struct nft_set_iter *iter,
3518 struct nft_set_elem *elem)
3519 {
3520 struct nft_set_dump_args *args;
3521
3522 args = container_of(iter, struct nft_set_dump_args, iter);
3523 return nf_tables_fill_setelem(args->skb, set, elem);
3524 }
3525
3526 struct nft_set_dump_ctx {
3527 const struct nft_set *set;
3528 struct nft_ctx ctx;
3529 };
3530
3531 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
3532 {
3533 struct nft_set_dump_ctx *dump_ctx = cb->data;
3534 struct net *net = sock_net(skb->sk);
3535 struct nft_af_info *afi;
3536 struct nft_table *table;
3537 struct nft_set *set;
3538 struct nft_set_dump_args args;
3539 bool set_found = false;
3540 struct nfgenmsg *nfmsg;
3541 struct nlmsghdr *nlh;
3542 struct nlattr *nest;
3543 u32 portid, seq;
3544 int event;
3545
3546 rcu_read_lock();
3547 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
3548 if (afi != dump_ctx->ctx.afi)
3549 continue;
3550
3551 list_for_each_entry_rcu(table, &afi->tables, list) {
3552 if (table != dump_ctx->ctx.table)
3553 continue;
3554
3555 list_for_each_entry_rcu(set, &table->sets, list) {
3556 if (set == dump_ctx->set) {
3557 set_found = true;
3558 break;
3559 }
3560 }
3561 break;
3562 }
3563 break;
3564 }
3565
3566 if (!set_found) {
3567 rcu_read_unlock();
3568 return -ENOENT;
3569 }
3570
3571 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
3572 portid = NETLINK_CB(cb->skb).portid;
3573 seq = cb->nlh->nlmsg_seq;
3574
3575 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3576 NLM_F_MULTI);
3577 if (nlh == NULL)
3578 goto nla_put_failure;
3579
3580 nfmsg = nlmsg_data(nlh);
3581 nfmsg->nfgen_family = afi->family;
3582 nfmsg->version = NFNETLINK_V0;
3583 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
3584
3585 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
3586 goto nla_put_failure;
3587 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
3588 goto nla_put_failure;
3589
3590 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3591 if (nest == NULL)
3592 goto nla_put_failure;
3593
3594 args.cb = cb;
3595 args.skb = skb;
3596 args.iter.genmask = nft_genmask_cur(net);
3597 args.iter.skip = cb->args[0];
3598 args.iter.count = 0;
3599 args.iter.err = 0;
3600 args.iter.fn = nf_tables_dump_setelem;
3601 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
3602 rcu_read_unlock();
3603
3604 nla_nest_end(skb, nest);
3605 nlmsg_end(skb, nlh);
3606
3607 if (args.iter.err && args.iter.err != -EMSGSIZE)
3608 return args.iter.err;
3609 if (args.iter.count == cb->args[0])
3610 return 0;
3611
3612 cb->args[0] = args.iter.count;
3613 return skb->len;
3614
3615 nla_put_failure:
3616 rcu_read_unlock();
3617 return -ENOSPC;
3618 }
3619
3620 static int nf_tables_dump_set_done(struct netlink_callback *cb)
3621 {
3622 kfree(cb->data);
3623 return 0;
3624 }
3625
3626 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
3627 const struct nft_ctx *ctx, u32 seq,
3628 u32 portid, int event, u16 flags,
3629 const struct nft_set *set,
3630 const struct nft_set_elem *elem)
3631 {
3632 struct nfgenmsg *nfmsg;
3633 struct nlmsghdr *nlh;
3634 struct nlattr *nest;
3635 int err;
3636
3637 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3638 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3639 flags);
3640 if (nlh == NULL)
3641 goto nla_put_failure;
3642
3643 nfmsg = nlmsg_data(nlh);
3644 nfmsg->nfgen_family = ctx->afi->family;
3645 nfmsg->version = NFNETLINK_V0;
3646 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3647
3648 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3649 goto nla_put_failure;
3650 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3651 goto nla_put_failure;
3652
3653 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
3654 if (nest == NULL)
3655 goto nla_put_failure;
3656
3657 err = nf_tables_fill_setelem(skb, set, elem);
3658 if (err < 0)
3659 goto nla_put_failure;
3660
3661 nla_nest_end(skb, nest);
3662
3663 nlmsg_end(skb, nlh);
3664 return 0;
3665
3666 nla_put_failure:
3667 nlmsg_trim(skb, nlh);
3668 return -1;
3669 }
3670
3671 static int nft_setelem_parse_flags(const struct nft_set *set,
3672 const struct nlattr *attr, u32 *flags)
3673 {
3674 if (attr == NULL)
3675 return 0;
3676
3677 *flags = ntohl(nla_get_be32(attr));
3678 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
3679 return -EINVAL;
3680 if (!(set->flags & NFT_SET_INTERVAL) &&
3681 *flags & NFT_SET_ELEM_INTERVAL_END)
3682 return -EINVAL;
3683
3684 return 0;
3685 }
3686
3687 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3688 const struct nlattr *attr)
3689 {
3690 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3691 const struct nft_set_ext *ext;
3692 struct nft_data_desc desc;
3693 struct nft_set_elem elem;
3694 struct sk_buff *skb;
3695 uint32_t flags = 0;
3696 void *priv;
3697 int err;
3698
3699 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3700 nft_set_elem_policy, NULL);
3701 if (err < 0)
3702 return err;
3703
3704 if (!nla[NFTA_SET_ELEM_KEY])
3705 return -EINVAL;
3706
3707 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3708 if (err < 0)
3709 return err;
3710
3711 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
3712 nla[NFTA_SET_ELEM_KEY]);
3713 if (err < 0)
3714 return err;
3715
3716 err = -EINVAL;
3717 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3718 return err;
3719
3720 priv = set->ops->get(ctx->net, set, &elem, flags);
3721 if (IS_ERR(priv))
3722 return PTR_ERR(priv);
3723
3724 elem.priv = priv;
3725 ext = nft_set_elem_ext(set, &elem);
3726
3727 err = -ENOMEM;
3728 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3729 if (skb == NULL)
3730 goto err1;
3731
3732 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
3733 NFT_MSG_NEWSETELEM, 0, set, &elem);
3734 if (err < 0)
3735 goto err2;
3736
3737 err = nfnetlink_unicast(skb, ctx->net, ctx->portid, MSG_DONTWAIT);
3738 /* This avoids a loop in nfnetlink. */
3739 if (err < 0)
3740 goto err1;
3741
3742 return 0;
3743 err2:
3744 kfree_skb(skb);
3745 err1:
3746 /* this avoids a loop in nfnetlink. */
3747 return err == -EAGAIN ? -ENOBUFS : err;
3748 }
3749
3750 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
3751 struct sk_buff *skb, const struct nlmsghdr *nlh,
3752 const struct nlattr * const nla[],
3753 struct netlink_ext_ack *extack)
3754 {
3755 u8 genmask = nft_genmask_cur(net);
3756 struct nft_set *set;
3757 struct nlattr *attr;
3758 struct nft_ctx ctx;
3759 int rem, err = 0;
3760
3761 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
3762 if (err < 0)
3763 return err;
3764
3765 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
3766 genmask);
3767 if (IS_ERR(set))
3768 return PTR_ERR(set);
3769
3770 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3771 struct netlink_dump_control c = {
3772 .dump = nf_tables_dump_set,
3773 .done = nf_tables_dump_set_done,
3774 };
3775 struct nft_set_dump_ctx *dump_ctx;
3776
3777 dump_ctx = kmalloc(sizeof(*dump_ctx), GFP_KERNEL);
3778 if (!dump_ctx)
3779 return -ENOMEM;
3780
3781 dump_ctx->set = set;
3782 dump_ctx->ctx = ctx;
3783
3784 c.data = dump_ctx;
3785 return netlink_dump_start(nlsk, skb, nlh, &c);
3786 }
3787
3788 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
3789 return -EINVAL;
3790
3791 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3792 err = nft_get_set_elem(&ctx, set, attr);
3793 if (err < 0)
3794 break;
3795 }
3796
3797 return err;
3798 }
3799
3800 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
3801 const struct nft_set *set,
3802 const struct nft_set_elem *elem,
3803 int event, u16 flags)
3804 {
3805 struct net *net = ctx->net;
3806 u32 portid = ctx->portid;
3807 struct sk_buff *skb;
3808 int err;
3809
3810 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3811 return;
3812
3813 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3814 if (skb == NULL)
3815 goto err;
3816
3817 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3818 set, elem);
3819 if (err < 0) {
3820 kfree_skb(skb);
3821 goto err;
3822 }
3823
3824 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3825 GFP_KERNEL);
3826 return;
3827 err:
3828 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3829 }
3830
3831 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3832 int msg_type,
3833 struct nft_set *set)
3834 {
3835 struct nft_trans *trans;
3836
3837 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3838 if (trans == NULL)
3839 return NULL;
3840
3841 nft_trans_elem_set(trans) = set;
3842 return trans;
3843 }
3844
3845 void *nft_set_elem_init(const struct nft_set *set,
3846 const struct nft_set_ext_tmpl *tmpl,
3847 const u32 *key, const u32 *data,
3848 u64 timeout, gfp_t gfp)
3849 {
3850 struct nft_set_ext *ext;
3851 void *elem;
3852
3853 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
3854 if (elem == NULL)
3855 return NULL;
3856
3857 ext = nft_set_elem_ext(set, elem);
3858 nft_set_ext_init(ext, tmpl);
3859
3860 memcpy(nft_set_ext_key(ext), key, set->klen);
3861 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3862 memcpy(nft_set_ext_data(ext), data, set->dlen);
3863 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
3864 *nft_set_ext_expiration(ext) =
3865 jiffies + timeout;
3866 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
3867 *nft_set_ext_timeout(ext) = timeout;
3868
3869 return elem;
3870 }
3871
3872 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
3873 bool destroy_expr)
3874 {
3875 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3876
3877 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
3878 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
3879 nft_data_release(nft_set_ext_data(ext), set->dtype);
3880 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3881 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3882 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
3883 (*nft_set_ext_obj(ext))->use--;
3884 kfree(elem);
3885 }
3886 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
3887
3888 /* Only called from commit path, nft_set_elem_deactivate() already deals with
3889 * the refcounting from the preparation phase.
3890 */
3891 static void nf_tables_set_elem_destroy(const struct nft_set *set, void *elem)
3892 {
3893 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
3894
3895 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
3896 nf_tables_expr_destroy(NULL, nft_set_ext_expr(ext));
3897 kfree(elem);
3898 }
3899
3900 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3901 const struct nlattr *attr, u32 nlmsg_flags)
3902 {
3903 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3904 u8 genmask = nft_genmask_next(ctx->net);
3905 struct nft_data_desc d1, d2;
3906 struct nft_set_ext_tmpl tmpl;
3907 struct nft_set_ext *ext, *ext2;
3908 struct nft_set_elem elem;
3909 struct nft_set_binding *binding;
3910 struct nft_object *obj = NULL;
3911 struct nft_userdata *udata;
3912 struct nft_data data;
3913 enum nft_registers dreg;
3914 struct nft_trans *trans;
3915 u32 flags = 0;
3916 u64 timeout;
3917 u8 ulen;
3918 int err;
3919
3920 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3921 nft_set_elem_policy, NULL);
3922 if (err < 0)
3923 return err;
3924
3925 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3926 return -EINVAL;
3927
3928 nft_set_ext_prepare(&tmpl);
3929
3930 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
3931 if (err < 0)
3932 return err;
3933 if (flags != 0)
3934 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
3935
3936 if (set->flags & NFT_SET_MAP) {
3937 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3938 !(flags & NFT_SET_ELEM_INTERVAL_END))
3939 return -EINVAL;
3940 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3941 flags & NFT_SET_ELEM_INTERVAL_END)
3942 return -EINVAL;
3943 } else {
3944 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3945 return -EINVAL;
3946 }
3947
3948 timeout = 0;
3949 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
3950 if (!(set->flags & NFT_SET_TIMEOUT))
3951 return -EINVAL;
3952 timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
3953 nla[NFTA_SET_ELEM_TIMEOUT])));
3954 } else if (set->flags & NFT_SET_TIMEOUT) {
3955 timeout = set->timeout;
3956 }
3957
3958 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &d1,
3959 nla[NFTA_SET_ELEM_KEY]);
3960 if (err < 0)
3961 goto err1;
3962 err = -EINVAL;
3963 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3964 goto err2;
3965
3966 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, d1.len);
3967 if (timeout > 0) {
3968 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
3969 if (timeout != set->timeout)
3970 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
3971 }
3972
3973 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
3974 if (!(set->flags & NFT_SET_OBJECT)) {
3975 err = -EINVAL;
3976 goto err2;
3977 }
3978 obj = nf_tables_obj_lookup(ctx->table, nla[NFTA_SET_ELEM_OBJREF],
3979 set->objtype, genmask);
3980 if (IS_ERR(obj)) {
3981 err = PTR_ERR(obj);
3982 goto err2;
3983 }
3984 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
3985 }
3986
3987 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3988 err = nft_data_init(ctx, &data, sizeof(data), &d2,
3989 nla[NFTA_SET_ELEM_DATA]);
3990 if (err < 0)
3991 goto err2;
3992
3993 err = -EINVAL;
3994 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3995 goto err3;
3996
3997 dreg = nft_type_to_reg(set->dtype);
3998 list_for_each_entry(binding, &set->bindings, list) {
3999 struct nft_ctx bind_ctx = {
4000 .net = ctx->net,
4001 .afi = ctx->afi,
4002 .table = ctx->table,
4003 .chain = (struct nft_chain *)binding->chain,
4004 };
4005
4006 if (!(binding->flags & NFT_SET_MAP))
4007 continue;
4008
4009 err = nft_validate_register_store(&bind_ctx, dreg,
4010 &data,
4011 d2.type, d2.len);
4012 if (err < 0)
4013 goto err3;
4014 }
4015
4016 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, d2.len);
4017 }
4018
4019 /* The full maximum length of userdata can exceed the maximum
4020 * offset value (U8_MAX) for following extensions, therefor it
4021 * must be the last extension added.
4022 */
4023 ulen = 0;
4024 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
4025 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
4026 if (ulen > 0)
4027 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
4028 ulen);
4029 }
4030
4031 err = -ENOMEM;
4032 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, data.data,
4033 timeout, GFP_KERNEL);
4034 if (elem.priv == NULL)
4035 goto err3;
4036
4037 ext = nft_set_elem_ext(set, elem.priv);
4038 if (flags)
4039 *nft_set_ext_flags(ext) = flags;
4040 if (ulen > 0) {
4041 udata = nft_set_ext_userdata(ext);
4042 udata->len = ulen - 1;
4043 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
4044 }
4045 if (obj) {
4046 *nft_set_ext_obj(ext) = obj;
4047 obj->use++;
4048 }
4049
4050 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
4051 if (trans == NULL)
4052 goto err4;
4053
4054 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
4055 err = set->ops->insert(ctx->net, set, &elem, &ext2);
4056 if (err) {
4057 if (err == -EEXIST) {
4058 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
4059 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
4060 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
4061 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
4062 return -EBUSY;
4063 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4064 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
4065 memcmp(nft_set_ext_data(ext),
4066 nft_set_ext_data(ext2), set->dlen) != 0) ||
4067 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4068 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
4069 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
4070 err = -EBUSY;
4071 else if (!(nlmsg_flags & NLM_F_EXCL))
4072 err = 0;
4073 }
4074 goto err5;
4075 }
4076
4077 if (set->size &&
4078 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
4079 err = -ENFILE;
4080 goto err6;
4081 }
4082
4083 nft_trans_elem(trans) = elem;
4084 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4085 return 0;
4086
4087 err6:
4088 set->ops->remove(ctx->net, set, &elem);
4089 err5:
4090 kfree(trans);
4091 err4:
4092 kfree(elem.priv);
4093 err3:
4094 if (nla[NFTA_SET_ELEM_DATA] != NULL)
4095 nft_data_release(&data, d2.type);
4096 err2:
4097 nft_data_release(&elem.key.val, d1.type);
4098 err1:
4099 return err;
4100 }
4101
4102 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
4103 struct sk_buff *skb, const struct nlmsghdr *nlh,
4104 const struct nlattr * const nla[],
4105 struct netlink_ext_ack *extack)
4106 {
4107 u8 genmask = nft_genmask_next(net);
4108 const struct nlattr *attr;
4109 struct nft_set *set;
4110 struct nft_ctx ctx;
4111 int rem, err = 0;
4112
4113 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
4114 return -EINVAL;
4115
4116 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4117 if (err < 0)
4118 return err;
4119
4120 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4121 genmask);
4122 if (IS_ERR(set)) {
4123 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
4124 set = nf_tables_set_lookup_byid(net,
4125 nla[NFTA_SET_ELEM_LIST_SET_ID],
4126 genmask);
4127 }
4128 if (IS_ERR(set))
4129 return PTR_ERR(set);
4130 }
4131
4132 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4133 return -EBUSY;
4134
4135 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4136 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
4137 if (err < 0)
4138 break;
4139 }
4140 return err;
4141 }
4142
4143 /**
4144 * nft_data_hold - hold a nft_data item
4145 *
4146 * @data: struct nft_data to release
4147 * @type: type of data
4148 *
4149 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4150 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
4151 * NFT_GOTO verdicts. This function must be called on active data objects
4152 * from the second phase of the commit protocol.
4153 */
4154 static void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
4155 {
4156 if (type == NFT_DATA_VERDICT) {
4157 switch (data->verdict.code) {
4158 case NFT_JUMP:
4159 case NFT_GOTO:
4160 data->verdict.chain->use++;
4161 break;
4162 }
4163 }
4164 }
4165
4166 static void nft_set_elem_activate(const struct net *net,
4167 const struct nft_set *set,
4168 struct nft_set_elem *elem)
4169 {
4170 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4171
4172 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4173 nft_data_hold(nft_set_ext_data(ext), set->dtype);
4174 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4175 (*nft_set_ext_obj(ext))->use++;
4176 }
4177
4178 static void nft_set_elem_deactivate(const struct net *net,
4179 const struct nft_set *set,
4180 struct nft_set_elem *elem)
4181 {
4182 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4183
4184 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
4185 nft_data_release(nft_set_ext_data(ext), set->dtype);
4186 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
4187 (*nft_set_ext_obj(ext))->use--;
4188 }
4189
4190 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
4191 const struct nlattr *attr)
4192 {
4193 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4194 struct nft_set_ext_tmpl tmpl;
4195 struct nft_data_desc desc;
4196 struct nft_set_elem elem;
4197 struct nft_set_ext *ext;
4198 struct nft_trans *trans;
4199 u32 flags = 0;
4200 void *priv;
4201 int err;
4202
4203 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
4204 nft_set_elem_policy, NULL);
4205 if (err < 0)
4206 goto err1;
4207
4208 err = -EINVAL;
4209 if (nla[NFTA_SET_ELEM_KEY] == NULL)
4210 goto err1;
4211
4212 nft_set_ext_prepare(&tmpl);
4213
4214 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4215 if (err < 0)
4216 return err;
4217 if (flags != 0)
4218 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
4219
4220 err = nft_data_init(ctx, &elem.key.val, sizeof(elem.key), &desc,
4221 nla[NFTA_SET_ELEM_KEY]);
4222 if (err < 0)
4223 goto err1;
4224
4225 err = -EINVAL;
4226 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
4227 goto err2;
4228
4229 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, desc.len);
4230
4231 err = -ENOMEM;
4232 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, NULL, 0,
4233 GFP_KERNEL);
4234 if (elem.priv == NULL)
4235 goto err2;
4236
4237 ext = nft_set_elem_ext(set, elem.priv);
4238 if (flags)
4239 *nft_set_ext_flags(ext) = flags;
4240
4241 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
4242 if (trans == NULL) {
4243 err = -ENOMEM;
4244 goto err3;
4245 }
4246
4247 priv = set->ops->deactivate(ctx->net, set, &elem);
4248 if (priv == NULL) {
4249 err = -ENOENT;
4250 goto err4;
4251 }
4252 kfree(elem.priv);
4253 elem.priv = priv;
4254
4255 nft_set_elem_deactivate(ctx->net, set, &elem);
4256
4257 nft_trans_elem(trans) = elem;
4258 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4259 return 0;
4260
4261 err4:
4262 kfree(trans);
4263 err3:
4264 kfree(elem.priv);
4265 err2:
4266 nft_data_release(&elem.key.val, desc.type);
4267 err1:
4268 return err;
4269 }
4270
4271 static int nft_flush_set(const struct nft_ctx *ctx,
4272 struct nft_set *set,
4273 const struct nft_set_iter *iter,
4274 struct nft_set_elem *elem)
4275 {
4276 struct nft_trans *trans;
4277 int err;
4278
4279 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
4280 sizeof(struct nft_trans_elem), GFP_ATOMIC);
4281 if (!trans)
4282 return -ENOMEM;
4283
4284 if (!set->ops->flush(ctx->net, set, elem->priv)) {
4285 err = -ENOENT;
4286 goto err1;
4287 }
4288 set->ndeact++;
4289
4290 nft_trans_elem_set(trans) = set;
4291 nft_trans_elem(trans) = *elem;
4292 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
4293
4294 return 0;
4295 err1:
4296 kfree(trans);
4297 return err;
4298 }
4299
4300 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
4301 struct sk_buff *skb, const struct nlmsghdr *nlh,
4302 const struct nlattr * const nla[],
4303 struct netlink_ext_ack *extack)
4304 {
4305 u8 genmask = nft_genmask_next(net);
4306 const struct nlattr *attr;
4307 struct nft_set *set;
4308 struct nft_ctx ctx;
4309 int rem, err = 0;
4310
4311 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, genmask);
4312 if (err < 0)
4313 return err;
4314
4315 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
4316 genmask);
4317 if (IS_ERR(set))
4318 return PTR_ERR(set);
4319 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
4320 return -EBUSY;
4321
4322 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
4323 struct nft_set_iter iter = {
4324 .genmask = genmask,
4325 .fn = nft_flush_set,
4326 };
4327 set->ops->walk(&ctx, set, &iter);
4328
4329 return iter.err;
4330 }
4331
4332 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4333 err = nft_del_setelem(&ctx, set, attr);
4334 if (err < 0)
4335 break;
4336
4337 set->ndeact++;
4338 }
4339 return err;
4340 }
4341
4342 void nft_set_gc_batch_release(struct rcu_head *rcu)
4343 {
4344 struct nft_set_gc_batch *gcb;
4345 unsigned int i;
4346
4347 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
4348 for (i = 0; i < gcb->head.cnt; i++)
4349 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
4350 kfree(gcb);
4351 }
4352 EXPORT_SYMBOL_GPL(nft_set_gc_batch_release);
4353
4354 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
4355 gfp_t gfp)
4356 {
4357 struct nft_set_gc_batch *gcb;
4358
4359 gcb = kzalloc(sizeof(*gcb), gfp);
4360 if (gcb == NULL)
4361 return gcb;
4362 gcb->head.set = set;
4363 return gcb;
4364 }
4365 EXPORT_SYMBOL_GPL(nft_set_gc_batch_alloc);
4366
4367 /*
4368 * Stateful objects
4369 */
4370
4371 /**
4372 * nft_register_obj- register nf_tables stateful object type
4373 * @obj: object type
4374 *
4375 * Registers the object type for use with nf_tables. Returns zero on
4376 * success or a negative errno code otherwise.
4377 */
4378 int nft_register_obj(struct nft_object_type *obj_type)
4379 {
4380 if (obj_type->type == NFT_OBJECT_UNSPEC)
4381 return -EINVAL;
4382
4383 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4384 list_add_rcu(&obj_type->list, &nf_tables_objects);
4385 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4386 return 0;
4387 }
4388 EXPORT_SYMBOL_GPL(nft_register_obj);
4389
4390 /**
4391 * nft_unregister_obj - unregister nf_tables object type
4392 * @obj: object type
4393 *
4394 * Unregisters the object type for use with nf_tables.
4395 */
4396 void nft_unregister_obj(struct nft_object_type *obj_type)
4397 {
4398 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4399 list_del_rcu(&obj_type->list);
4400 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4401 }
4402 EXPORT_SYMBOL_GPL(nft_unregister_obj);
4403
4404 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
4405 const struct nlattr *nla,
4406 u32 objtype, u8 genmask)
4407 {
4408 struct nft_object *obj;
4409
4410 list_for_each_entry(obj, &table->objects, list) {
4411 if (!nla_strcmp(nla, obj->name) &&
4412 objtype == obj->ops->type->type &&
4413 nft_active_genmask(obj, genmask))
4414 return obj;
4415 }
4416 return ERR_PTR(-ENOENT);
4417 }
4418 EXPORT_SYMBOL_GPL(nf_tables_obj_lookup);
4419
4420 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
4421 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
4422 .len = NFT_TABLE_MAXNAMELEN - 1 },
4423 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
4424 .len = NFT_OBJ_MAXNAMELEN - 1 },
4425 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
4426 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
4427 };
4428
4429 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
4430 const struct nft_object_type *type,
4431 const struct nlattr *attr)
4432 {
4433 struct nlattr *tb[type->maxattr + 1];
4434 const struct nft_object_ops *ops;
4435 struct nft_object *obj;
4436 int err;
4437
4438 if (attr) {
4439 err = nla_parse_nested(tb, type->maxattr, attr, type->policy,
4440 NULL);
4441 if (err < 0)
4442 goto err1;
4443 } else {
4444 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
4445 }
4446
4447 if (type->select_ops) {
4448 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
4449 if (IS_ERR(ops)) {
4450 err = PTR_ERR(ops);
4451 goto err1;
4452 }
4453 } else {
4454 ops = type->ops;
4455 }
4456
4457 err = -ENOMEM;
4458 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
4459 if (obj == NULL)
4460 goto err1;
4461
4462 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
4463 if (err < 0)
4464 goto err2;
4465
4466 obj->ops = ops;
4467
4468 return obj;
4469 err2:
4470 kfree(obj);
4471 err1:
4472 return ERR_PTR(err);
4473 }
4474
4475 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
4476 struct nft_object *obj, bool reset)
4477 {
4478 struct nlattr *nest;
4479
4480 nest = nla_nest_start(skb, attr);
4481 if (!nest)
4482 goto nla_put_failure;
4483 if (obj->ops->dump(skb, obj, reset) < 0)
4484 goto nla_put_failure;
4485 nla_nest_end(skb, nest);
4486 return 0;
4487
4488 nla_put_failure:
4489 return -1;
4490 }
4491
4492 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
4493 {
4494 const struct nft_object_type *type;
4495
4496 list_for_each_entry(type, &nf_tables_objects, list) {
4497 if (objtype == type->type)
4498 return type;
4499 }
4500 return NULL;
4501 }
4502
4503 static const struct nft_object_type *nft_obj_type_get(u32 objtype)
4504 {
4505 const struct nft_object_type *type;
4506
4507 type = __nft_obj_type_get(objtype);
4508 if (type != NULL && try_module_get(type->owner))
4509 return type;
4510
4511 #ifdef CONFIG_MODULES
4512 if (type == NULL) {
4513 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4514 request_module("nft-obj-%u", objtype);
4515 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4516 if (__nft_obj_type_get(objtype))
4517 return ERR_PTR(-EAGAIN);
4518 }
4519 #endif
4520 return ERR_PTR(-ENOENT);
4521 }
4522
4523 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
4524 struct sk_buff *skb, const struct nlmsghdr *nlh,
4525 const struct nlattr * const nla[],
4526 struct netlink_ext_ack *extack)
4527 {
4528 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4529 const struct nft_object_type *type;
4530 u8 genmask = nft_genmask_next(net);
4531 int family = nfmsg->nfgen_family;
4532 struct nft_af_info *afi;
4533 struct nft_table *table;
4534 struct nft_object *obj;
4535 struct nft_ctx ctx;
4536 u32 objtype;
4537 int err;
4538
4539 if (!nla[NFTA_OBJ_TYPE] ||
4540 !nla[NFTA_OBJ_NAME] ||
4541 !nla[NFTA_OBJ_DATA])
4542 return -EINVAL;
4543
4544 afi = nf_tables_afinfo_lookup(net, family, true);
4545 if (IS_ERR(afi))
4546 return PTR_ERR(afi);
4547
4548 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4549 if (IS_ERR(table))
4550 return PTR_ERR(table);
4551
4552 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4553 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4554 if (IS_ERR(obj)) {
4555 err = PTR_ERR(obj);
4556 if (err != -ENOENT)
4557 return err;
4558
4559 } else {
4560 if (nlh->nlmsg_flags & NLM_F_EXCL)
4561 return -EEXIST;
4562
4563 return 0;
4564 }
4565
4566 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4567
4568 type = nft_obj_type_get(objtype);
4569 if (IS_ERR(type))
4570 return PTR_ERR(type);
4571
4572 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
4573 if (IS_ERR(obj)) {
4574 err = PTR_ERR(obj);
4575 goto err1;
4576 }
4577 obj->table = table;
4578 obj->name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
4579 if (!obj->name) {
4580 err = -ENOMEM;
4581 goto err2;
4582 }
4583
4584 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
4585 if (err < 0)
4586 goto err3;
4587
4588 list_add_tail_rcu(&obj->list, &table->objects);
4589 table->use++;
4590 return 0;
4591 err3:
4592 kfree(obj->name);
4593 err2:
4594 if (obj->ops->destroy)
4595 obj->ops->destroy(obj);
4596 kfree(obj);
4597 err1:
4598 module_put(type->owner);
4599 return err;
4600 }
4601
4602 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
4603 u32 portid, u32 seq, int event, u32 flags,
4604 int family, const struct nft_table *table,
4605 struct nft_object *obj, bool reset)
4606 {
4607 struct nfgenmsg *nfmsg;
4608 struct nlmsghdr *nlh;
4609
4610 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4611 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
4612 if (nlh == NULL)
4613 goto nla_put_failure;
4614
4615 nfmsg = nlmsg_data(nlh);
4616 nfmsg->nfgen_family = family;
4617 nfmsg->version = NFNETLINK_V0;
4618 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4619
4620 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
4621 nla_put_string(skb, NFTA_OBJ_NAME, obj->name) ||
4622 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
4623 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
4624 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
4625 goto nla_put_failure;
4626
4627 nlmsg_end(skb, nlh);
4628 return 0;
4629
4630 nla_put_failure:
4631 nlmsg_trim(skb, nlh);
4632 return -1;
4633 }
4634
4635 struct nft_obj_filter {
4636 char *table;
4637 u32 type;
4638 };
4639
4640 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
4641 {
4642 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
4643 const struct nft_af_info *afi;
4644 const struct nft_table *table;
4645 unsigned int idx = 0, s_idx = cb->args[0];
4646 struct nft_obj_filter *filter = cb->data;
4647 struct net *net = sock_net(skb->sk);
4648 int family = nfmsg->nfgen_family;
4649 struct nft_object *obj;
4650 bool reset = false;
4651
4652 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4653 reset = true;
4654
4655 rcu_read_lock();
4656 cb->seq = net->nft.base_seq;
4657
4658 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
4659 if (family != NFPROTO_UNSPEC && family != afi->family)
4660 continue;
4661
4662 list_for_each_entry_rcu(table, &afi->tables, list) {
4663 list_for_each_entry_rcu(obj, &table->objects, list) {
4664 if (!nft_is_active(net, obj))
4665 goto cont;
4666 if (idx < s_idx)
4667 goto cont;
4668 if (idx > s_idx)
4669 memset(&cb->args[1], 0,
4670 sizeof(cb->args) - sizeof(cb->args[0]));
4671 if (filter && filter->table[0] &&
4672 strcmp(filter->table, table->name))
4673 goto cont;
4674 if (filter &&
4675 filter->type != NFT_OBJECT_UNSPEC &&
4676 obj->ops->type->type != filter->type)
4677 goto cont;
4678
4679 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
4680 cb->nlh->nlmsg_seq,
4681 NFT_MSG_NEWOBJ,
4682 NLM_F_MULTI | NLM_F_APPEND,
4683 afi->family, table, obj, reset) < 0)
4684 goto done;
4685
4686 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4687 cont:
4688 idx++;
4689 }
4690 }
4691 }
4692 done:
4693 rcu_read_unlock();
4694
4695 cb->args[0] = idx;
4696 return skb->len;
4697 }
4698
4699 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
4700 {
4701 struct nft_obj_filter *filter = cb->data;
4702
4703 kfree(filter->table);
4704 kfree(filter);
4705
4706 return 0;
4707 }
4708
4709 static struct nft_obj_filter *
4710 nft_obj_filter_alloc(const struct nlattr * const nla[])
4711 {
4712 struct nft_obj_filter *filter;
4713
4714 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
4715 if (!filter)
4716 return ERR_PTR(-ENOMEM);
4717
4718 if (nla[NFTA_OBJ_TABLE]) {
4719 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_KERNEL);
4720 if (!filter->table) {
4721 kfree(filter);
4722 return ERR_PTR(-ENOMEM);
4723 }
4724 }
4725 if (nla[NFTA_OBJ_TYPE])
4726 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4727
4728 return filter;
4729 }
4730
4731 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
4732 struct sk_buff *skb, const struct nlmsghdr *nlh,
4733 const struct nlattr * const nla[],
4734 struct netlink_ext_ack *extack)
4735 {
4736 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4737 u8 genmask = nft_genmask_cur(net);
4738 int family = nfmsg->nfgen_family;
4739 const struct nft_af_info *afi;
4740 const struct nft_table *table;
4741 struct nft_object *obj;
4742 struct sk_buff *skb2;
4743 bool reset = false;
4744 u32 objtype;
4745 int err;
4746
4747 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4748 struct netlink_dump_control c = {
4749 .dump = nf_tables_dump_obj,
4750 .done = nf_tables_dump_obj_done,
4751 };
4752
4753 if (nla[NFTA_OBJ_TABLE] ||
4754 nla[NFTA_OBJ_TYPE]) {
4755 struct nft_obj_filter *filter;
4756
4757 filter = nft_obj_filter_alloc(nla);
4758 if (IS_ERR(filter))
4759 return -ENOMEM;
4760
4761 c.data = filter;
4762 }
4763 return netlink_dump_start(nlsk, skb, nlh, &c);
4764 }
4765
4766 if (!nla[NFTA_OBJ_NAME] ||
4767 !nla[NFTA_OBJ_TYPE])
4768 return -EINVAL;
4769
4770 afi = nf_tables_afinfo_lookup(net, family, false);
4771 if (IS_ERR(afi))
4772 return PTR_ERR(afi);
4773
4774 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4775 if (IS_ERR(table))
4776 return PTR_ERR(table);
4777
4778 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4779 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4780 if (IS_ERR(obj))
4781 return PTR_ERR(obj);
4782
4783 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4784 if (!skb2)
4785 return -ENOMEM;
4786
4787 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
4788 reset = true;
4789
4790 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
4791 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
4792 family, table, obj, reset);
4793 if (err < 0)
4794 goto err;
4795
4796 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
4797 err:
4798 kfree_skb(skb2);
4799 return err;
4800 }
4801
4802 static void nft_obj_destroy(struct nft_object *obj)
4803 {
4804 if (obj->ops->destroy)
4805 obj->ops->destroy(obj);
4806
4807 module_put(obj->ops->type->owner);
4808 kfree(obj->name);
4809 kfree(obj);
4810 }
4811
4812 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
4813 struct sk_buff *skb, const struct nlmsghdr *nlh,
4814 const struct nlattr * const nla[],
4815 struct netlink_ext_ack *extack)
4816 {
4817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4818 u8 genmask = nft_genmask_next(net);
4819 int family = nfmsg->nfgen_family;
4820 struct nft_af_info *afi;
4821 struct nft_table *table;
4822 struct nft_object *obj;
4823 struct nft_ctx ctx;
4824 u32 objtype;
4825
4826 if (!nla[NFTA_OBJ_TYPE] ||
4827 !nla[NFTA_OBJ_NAME])
4828 return -EINVAL;
4829
4830 afi = nf_tables_afinfo_lookup(net, family, true);
4831 if (IS_ERR(afi))
4832 return PTR_ERR(afi);
4833
4834 table = nf_tables_table_lookup(afi, nla[NFTA_OBJ_TABLE], genmask);
4835 if (IS_ERR(table))
4836 return PTR_ERR(table);
4837
4838 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
4839 obj = nf_tables_obj_lookup(table, nla[NFTA_OBJ_NAME], objtype, genmask);
4840 if (IS_ERR(obj))
4841 return PTR_ERR(obj);
4842 if (obj->use > 0)
4843 return -EBUSY;
4844
4845 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
4846
4847 return nft_delobj(&ctx, obj);
4848 }
4849
4850 void nft_obj_notify(struct net *net, struct nft_table *table,
4851 struct nft_object *obj, u32 portid, u32 seq, int event,
4852 int family, int report, gfp_t gfp)
4853 {
4854 struct sk_buff *skb;
4855 int err;
4856
4857 if (!report &&
4858 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4859 return;
4860
4861 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
4862 if (skb == NULL)
4863 goto err;
4864
4865 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
4866 table, obj, false);
4867 if (err < 0) {
4868 kfree_skb(skb);
4869 goto err;
4870 }
4871
4872 nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
4873 return;
4874 err:
4875 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4876 }
4877 EXPORT_SYMBOL_GPL(nft_obj_notify);
4878
4879 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
4880 struct nft_object *obj, int event)
4881 {
4882 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
4883 ctx->afi->family, ctx->report, GFP_KERNEL);
4884 }
4885
4886 /*
4887 * Flow tables
4888 */
4889 void nft_register_flowtable_type(struct nf_flowtable_type *type)
4890 {
4891 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4892 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
4893 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4894 }
4895 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
4896
4897 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
4898 {
4899 nfnl_lock(NFNL_SUBSYS_NFTABLES);
4900 list_del_rcu(&type->list);
4901 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
4902 }
4903 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
4904
4905 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
4906 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
4907 .len = NFT_NAME_MAXLEN - 1 },
4908 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
4909 .len = NFT_NAME_MAXLEN - 1 },
4910 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
4911 };
4912
4913 struct nft_flowtable *nf_tables_flowtable_lookup(const struct nft_table *table,
4914 const struct nlattr *nla,
4915 u8 genmask)
4916 {
4917 struct nft_flowtable *flowtable;
4918
4919 list_for_each_entry(flowtable, &table->flowtables, list) {
4920 if (!nla_strcmp(nla, flowtable->name) &&
4921 nft_active_genmask(flowtable, genmask))
4922 return flowtable;
4923 }
4924 return ERR_PTR(-ENOENT);
4925 }
4926 EXPORT_SYMBOL_GPL(nf_tables_flowtable_lookup);
4927
4928 #define NFT_FLOWTABLE_DEVICE_MAX 8
4929
4930 static int nf_tables_parse_devices(const struct nft_ctx *ctx,
4931 const struct nlattr *attr,
4932 struct net_device *dev_array[], int *len)
4933 {
4934 const struct nlattr *tmp;
4935 struct net_device *dev;
4936 char ifname[IFNAMSIZ];
4937 int rem, n = 0, err;
4938
4939 nla_for_each_nested(tmp, attr, rem) {
4940 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
4941 err = -EINVAL;
4942 goto err1;
4943 }
4944
4945 nla_strlcpy(ifname, tmp, IFNAMSIZ);
4946 dev = dev_get_by_name(ctx->net, ifname);
4947 if (!dev) {
4948 err = -ENOENT;
4949 goto err1;
4950 }
4951
4952 dev_array[n++] = dev;
4953 if (n == NFT_FLOWTABLE_DEVICE_MAX) {
4954 err = -EFBIG;
4955 goto err1;
4956 }
4957 }
4958 if (!len)
4959 return -EINVAL;
4960
4961 err = 0;
4962 err1:
4963 *len = n;
4964 return err;
4965 }
4966
4967 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
4968 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
4969 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
4970 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
4971 };
4972
4973 static int nf_tables_flowtable_parse_hook(const struct nft_ctx *ctx,
4974 const struct nlattr *attr,
4975 struct nft_flowtable *flowtable)
4976 {
4977 struct net_device *dev_array[NFT_FLOWTABLE_DEVICE_MAX];
4978 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
4979 struct nf_hook_ops *ops;
4980 int hooknum, priority;
4981 int err, n = 0, i;
4982
4983 err = nla_parse_nested(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
4984 nft_flowtable_hook_policy, NULL);
4985 if (err < 0)
4986 return err;
4987
4988 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
4989 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY] ||
4990 !tb[NFTA_FLOWTABLE_HOOK_DEVS])
4991 return -EINVAL;
4992
4993 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
4994 if (hooknum >= ctx->afi->nhooks)
4995 return -EINVAL;
4996
4997 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
4998
4999 err = nf_tables_parse_devices(ctx, tb[NFTA_FLOWTABLE_HOOK_DEVS],
5000 dev_array, &n);
5001 if (err < 0)
5002 goto err1;
5003
5004 ops = kzalloc(sizeof(struct nf_hook_ops) * n, GFP_KERNEL);
5005 if (!ops) {
5006 err = -ENOMEM;
5007 goto err1;
5008 }
5009
5010 flowtable->ops = ops;
5011 flowtable->ops_len = n;
5012
5013 for (i = 0; i < n; i++) {
5014 flowtable->ops[i].pf = NFPROTO_NETDEV;
5015 flowtable->ops[i].hooknum = hooknum;
5016 flowtable->ops[i].priority = priority;
5017 flowtable->ops[i].priv = &flowtable->data.rhashtable;
5018 flowtable->ops[i].hook = flowtable->data.type->hook;
5019 flowtable->ops[i].dev = dev_array[i];
5020 }
5021
5022 err = 0;
5023 err1:
5024 for (i = 0; i < n; i++)
5025 dev_put(dev_array[i]);
5026
5027 return err;
5028 }
5029
5030 static const struct nf_flowtable_type *
5031 __nft_flowtable_type_get(const struct nft_af_info *afi)
5032 {
5033 const struct nf_flowtable_type *type;
5034
5035 list_for_each_entry(type, &nf_tables_flowtables, list) {
5036 if (afi->family == type->family)
5037 return type;
5038 }
5039 return NULL;
5040 }
5041
5042 static const struct nf_flowtable_type *
5043 nft_flowtable_type_get(const struct nft_af_info *afi)
5044 {
5045 const struct nf_flowtable_type *type;
5046
5047 type = __nft_flowtable_type_get(afi);
5048 if (type != NULL && try_module_get(type->owner))
5049 return type;
5050
5051 #ifdef CONFIG_MODULES
5052 if (type == NULL) {
5053 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5054 request_module("nf-flowtable-%u", afi->family);
5055 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5056 if (__nft_flowtable_type_get(afi))
5057 return ERR_PTR(-EAGAIN);
5058 }
5059 #endif
5060 return ERR_PTR(-ENOENT);
5061 }
5062
5063 void nft_flow_table_iterate(struct net *net,
5064 void (*iter)(struct nf_flowtable *flowtable, void *data),
5065 void *data)
5066 {
5067 struct nft_flowtable *flowtable;
5068 const struct nft_af_info *afi;
5069 const struct nft_table *table;
5070
5071 rcu_read_lock();
5072 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5073 list_for_each_entry_rcu(table, &afi->tables, list) {
5074 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5075 iter(&flowtable->data, data);
5076 }
5077 }
5078 }
5079 rcu_read_unlock();
5080 }
5081 EXPORT_SYMBOL_GPL(nft_flow_table_iterate);
5082
5083 static void nft_unregister_flowtable_net_hooks(struct net *net,
5084 struct nft_flowtable *flowtable)
5085 {
5086 int i;
5087
5088 for (i = 0; i < flowtable->ops_len; i++) {
5089 if (!flowtable->ops[i].dev)
5090 continue;
5091
5092 nf_unregister_net_hook(net, &flowtable->ops[i]);
5093 }
5094 }
5095
5096 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
5097 struct sk_buff *skb,
5098 const struct nlmsghdr *nlh,
5099 const struct nlattr * const nla[],
5100 struct netlink_ext_ack *extack)
5101 {
5102 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5103 const struct nf_flowtable_type *type;
5104 u8 genmask = nft_genmask_next(net);
5105 int family = nfmsg->nfgen_family;
5106 struct nft_flowtable *flowtable;
5107 struct nft_af_info *afi;
5108 struct nft_table *table;
5109 struct nft_ctx ctx;
5110 int err, i, k;
5111
5112 if (!nla[NFTA_FLOWTABLE_TABLE] ||
5113 !nla[NFTA_FLOWTABLE_NAME] ||
5114 !nla[NFTA_FLOWTABLE_HOOK])
5115 return -EINVAL;
5116
5117 afi = nf_tables_afinfo_lookup(net, family, true);
5118 if (IS_ERR(afi))
5119 return PTR_ERR(afi);
5120
5121 table = nf_tables_table_lookup(afi, nla[NFTA_FLOWTABLE_TABLE], genmask);
5122 if (IS_ERR(table))
5123 return PTR_ERR(table);
5124
5125 flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5126 genmask);
5127 if (IS_ERR(flowtable)) {
5128 err = PTR_ERR(flowtable);
5129 if (err != -ENOENT)
5130 return err;
5131 } else {
5132 if (nlh->nlmsg_flags & NLM_F_EXCL)
5133 return -EEXIST;
5134
5135 return 0;
5136 }
5137
5138 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
5139
5140 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
5141 if (!flowtable)
5142 return -ENOMEM;
5143
5144 flowtable->table = table;
5145 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
5146 if (!flowtable->name) {
5147 err = -ENOMEM;
5148 goto err1;
5149 }
5150
5151 type = nft_flowtable_type_get(afi);
5152 if (IS_ERR(type)) {
5153 err = PTR_ERR(type);
5154 goto err2;
5155 }
5156
5157 flowtable->data.type = type;
5158 err = rhashtable_init(&flowtable->data.rhashtable, type->params);
5159 if (err < 0)
5160 goto err3;
5161
5162 err = nf_tables_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
5163 flowtable);
5164 if (err < 0)
5165 goto err3;
5166
5167 for (i = 0; i < flowtable->ops_len; i++) {
5168 err = nf_register_net_hook(net, &flowtable->ops[i]);
5169 if (err < 0)
5170 goto err4;
5171 }
5172
5173 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
5174 if (err < 0)
5175 goto err5;
5176
5177 INIT_DEFERRABLE_WORK(&flowtable->data.gc_work, type->gc);
5178 queue_delayed_work(system_power_efficient_wq,
5179 &flowtable->data.gc_work, HZ);
5180
5181 list_add_tail_rcu(&flowtable->list, &table->flowtables);
5182 table->use++;
5183
5184 return 0;
5185 err5:
5186 i = flowtable->ops_len;
5187 err4:
5188 for (k = i - 1; k >= 0; k--)
5189 nf_unregister_net_hook(net, &flowtable->ops[i]);
5190
5191 kfree(flowtable->ops);
5192 err3:
5193 module_put(type->owner);
5194 err2:
5195 kfree(flowtable->name);
5196 err1:
5197 kfree(flowtable);
5198 return err;
5199 }
5200
5201 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
5202 struct sk_buff *skb,
5203 const struct nlmsghdr *nlh,
5204 const struct nlattr * const nla[],
5205 struct netlink_ext_ack *extack)
5206 {
5207 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5208 u8 genmask = nft_genmask_next(net);
5209 int family = nfmsg->nfgen_family;
5210 struct nft_flowtable *flowtable;
5211 struct nft_af_info *afi;
5212 struct nft_table *table;
5213 struct nft_ctx ctx;
5214
5215 afi = nf_tables_afinfo_lookup(net, family, true);
5216 if (IS_ERR(afi))
5217 return PTR_ERR(afi);
5218
5219 table = nf_tables_table_lookup(afi, nla[NFTA_FLOWTABLE_TABLE], genmask);
5220 if (IS_ERR(table))
5221 return PTR_ERR(table);
5222
5223 flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5224 genmask);
5225 if (IS_ERR(flowtable))
5226 return PTR_ERR(flowtable);
5227 if (flowtable->use > 0)
5228 return -EBUSY;
5229
5230 nft_ctx_init(&ctx, net, skb, nlh, afi, table, NULL, nla);
5231
5232 return nft_delflowtable(&ctx, flowtable);
5233 }
5234
5235 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
5236 u32 portid, u32 seq, int event,
5237 u32 flags, int family,
5238 struct nft_flowtable *flowtable)
5239 {
5240 struct nlattr *nest, *nest_devs;
5241 struct nfgenmsg *nfmsg;
5242 struct nlmsghdr *nlh;
5243 int i;
5244
5245 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5246 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5247 if (nlh == NULL)
5248 goto nla_put_failure;
5249
5250 nfmsg = nlmsg_data(nlh);
5251 nfmsg->nfgen_family = family;
5252 nfmsg->version = NFNETLINK_V0;
5253 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5254
5255 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
5256 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
5257 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)))
5258 goto nla_put_failure;
5259
5260 nest = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK);
5261 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
5262 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->priority)))
5263 goto nla_put_failure;
5264
5265 nest_devs = nla_nest_start(skb, NFTA_FLOWTABLE_HOOK_DEVS);
5266 if (!nest_devs)
5267 goto nla_put_failure;
5268
5269 for (i = 0; i < flowtable->ops_len; i++) {
5270 if (flowtable->ops[i].dev &&
5271 nla_put_string(skb, NFTA_DEVICE_NAME,
5272 flowtable->ops[i].dev->name))
5273 goto nla_put_failure;
5274 }
5275 nla_nest_end(skb, nest_devs);
5276 nla_nest_end(skb, nest);
5277
5278 nlmsg_end(skb, nlh);
5279 return 0;
5280
5281 nla_put_failure:
5282 nlmsg_trim(skb, nlh);
5283 return -1;
5284 }
5285
5286 struct nft_flowtable_filter {
5287 char *table;
5288 };
5289
5290 static int nf_tables_dump_flowtable(struct sk_buff *skb,
5291 struct netlink_callback *cb)
5292 {
5293 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
5294 struct nft_flowtable_filter *filter = cb->data;
5295 unsigned int idx = 0, s_idx = cb->args[0];
5296 struct net *net = sock_net(skb->sk);
5297 int family = nfmsg->nfgen_family;
5298 struct nft_flowtable *flowtable;
5299 const struct nft_af_info *afi;
5300 const struct nft_table *table;
5301
5302 rcu_read_lock();
5303 cb->seq = net->nft.base_seq;
5304
5305 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
5306 if (family != NFPROTO_UNSPEC && family != afi->family)
5307 continue;
5308
5309 list_for_each_entry_rcu(table, &afi->tables, list) {
5310 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
5311 if (!nft_is_active(net, flowtable))
5312 goto cont;
5313 if (idx < s_idx)
5314 goto cont;
5315 if (idx > s_idx)
5316 memset(&cb->args[1], 0,
5317 sizeof(cb->args) - sizeof(cb->args[0]));
5318 if (filter && filter->table[0] &&
5319 strcmp(filter->table, table->name))
5320 goto cont;
5321
5322 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
5323 cb->nlh->nlmsg_seq,
5324 NFT_MSG_NEWFLOWTABLE,
5325 NLM_F_MULTI | NLM_F_APPEND,
5326 afi->family, flowtable) < 0)
5327 goto done;
5328
5329 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5330 cont:
5331 idx++;
5332 }
5333 }
5334 }
5335 done:
5336 rcu_read_unlock();
5337
5338 cb->args[0] = idx;
5339 return skb->len;
5340 }
5341
5342 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
5343 {
5344 struct nft_flowtable_filter *filter = cb->data;
5345
5346 if (!filter)
5347 return 0;
5348
5349 kfree(filter->table);
5350 kfree(filter);
5351
5352 return 0;
5353 }
5354
5355 static struct nft_flowtable_filter *
5356 nft_flowtable_filter_alloc(const struct nlattr * const nla[])
5357 {
5358 struct nft_flowtable_filter *filter;
5359
5360 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
5361 if (!filter)
5362 return ERR_PTR(-ENOMEM);
5363
5364 if (nla[NFTA_FLOWTABLE_TABLE]) {
5365 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
5366 GFP_KERNEL);
5367 if (!filter->table) {
5368 kfree(filter);
5369 return ERR_PTR(-ENOMEM);
5370 }
5371 }
5372 return filter;
5373 }
5374
5375 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
5376 struct sk_buff *skb,
5377 const struct nlmsghdr *nlh,
5378 const struct nlattr * const nla[],
5379 struct netlink_ext_ack *extack)
5380 {
5381 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5382 u8 genmask = nft_genmask_cur(net);
5383 int family = nfmsg->nfgen_family;
5384 struct nft_flowtable *flowtable;
5385 const struct nft_af_info *afi;
5386 const struct nft_table *table;
5387 struct sk_buff *skb2;
5388 int err;
5389
5390 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5391 struct netlink_dump_control c = {
5392 .dump = nf_tables_dump_flowtable,
5393 .done = nf_tables_dump_flowtable_done,
5394 };
5395
5396 if (nla[NFTA_FLOWTABLE_TABLE]) {
5397 struct nft_flowtable_filter *filter;
5398
5399 filter = nft_flowtable_filter_alloc(nla);
5400 if (IS_ERR(filter))
5401 return -ENOMEM;
5402
5403 c.data = filter;
5404 }
5405 return netlink_dump_start(nlsk, skb, nlh, &c);
5406 }
5407
5408 if (!nla[NFTA_FLOWTABLE_NAME])
5409 return -EINVAL;
5410
5411 afi = nf_tables_afinfo_lookup(net, family, false);
5412 if (IS_ERR(afi))
5413 return PTR_ERR(afi);
5414
5415 table = nf_tables_table_lookup(afi, nla[NFTA_FLOWTABLE_TABLE], genmask);
5416 if (IS_ERR(table))
5417 return PTR_ERR(table);
5418
5419 flowtable = nf_tables_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
5420 genmask);
5421 if (IS_ERR(table))
5422 return PTR_ERR(flowtable);
5423
5424 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5425 if (!skb2)
5426 return -ENOMEM;
5427
5428 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
5429 nlh->nlmsg_seq,
5430 NFT_MSG_NEWFLOWTABLE, 0, family,
5431 flowtable);
5432 if (err < 0)
5433 goto err;
5434
5435 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5436 err:
5437 kfree_skb(skb2);
5438 return err;
5439 }
5440
5441 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
5442 struct nft_flowtable *flowtable,
5443 int event)
5444 {
5445 struct sk_buff *skb;
5446 int err;
5447
5448 if (ctx->report &&
5449 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
5450 return;
5451
5452 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5453 if (skb == NULL)
5454 goto err;
5455
5456 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
5457 ctx->seq, event, 0,
5458 ctx->afi->family, flowtable);
5459 if (err < 0) {
5460 kfree_skb(skb);
5461 goto err;
5462 }
5463
5464 nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
5465 ctx->report, GFP_KERNEL);
5466 return;
5467 err:
5468 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
5469 }
5470
5471 static void nft_flowtable_destroy(void *ptr, void *arg)
5472 {
5473 kfree(ptr);
5474 }
5475
5476 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
5477 {
5478 cancel_delayed_work_sync(&flowtable->data.gc_work);
5479 kfree(flowtable->name);
5480 rhashtable_free_and_destroy(&flowtable->data.rhashtable,
5481 nft_flowtable_destroy, NULL);
5482 module_put(flowtable->data.type->owner);
5483 }
5484
5485 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
5486 u32 portid, u32 seq)
5487 {
5488 struct nlmsghdr *nlh;
5489 struct nfgenmsg *nfmsg;
5490 char buf[TASK_COMM_LEN];
5491 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
5492
5493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
5494 if (nlh == NULL)
5495 goto nla_put_failure;
5496
5497 nfmsg = nlmsg_data(nlh);
5498 nfmsg->nfgen_family = AF_UNSPEC;
5499 nfmsg->version = NFNETLINK_V0;
5500 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
5501
5502 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
5503 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
5504 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
5505 goto nla_put_failure;
5506
5507 nlmsg_end(skb, nlh);
5508 return 0;
5509
5510 nla_put_failure:
5511 nlmsg_trim(skb, nlh);
5512 return -EMSGSIZE;
5513 }
5514
5515 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
5516 struct nft_flowtable *flowtable)
5517 {
5518 int i;
5519
5520 for (i = 0; i < flowtable->ops_len; i++) {
5521 if (flowtable->ops[i].dev != dev)
5522 continue;
5523
5524 nf_unregister_net_hook(dev_net(dev), &flowtable->ops[i]);
5525 flowtable->ops[i].dev = NULL;
5526 break;
5527 }
5528 }
5529
5530 static int nf_tables_flowtable_event(struct notifier_block *this,
5531 unsigned long event, void *ptr)
5532 {
5533 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5534 struct nft_flowtable *flowtable;
5535 struct nft_table *table;
5536 struct nft_af_info *afi;
5537
5538 if (event != NETDEV_UNREGISTER)
5539 return 0;
5540
5541 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5542 list_for_each_entry(afi, &dev_net(dev)->nft.af_info, list) {
5543 list_for_each_entry(table, &afi->tables, list) {
5544 list_for_each_entry(flowtable, &table->flowtables, list) {
5545 nft_flowtable_event(event, dev, flowtable);
5546 }
5547 }
5548 }
5549 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5550
5551 return NOTIFY_DONE;
5552 }
5553
5554 static struct notifier_block nf_tables_flowtable_notifier = {
5555 .notifier_call = nf_tables_flowtable_event,
5556 };
5557
5558 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
5559 int event)
5560 {
5561 struct nlmsghdr *nlh = nlmsg_hdr(skb);
5562 struct sk_buff *skb2;
5563 int err;
5564
5565 if (nlmsg_report(nlh) &&
5566 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5567 return;
5568
5569 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5570 if (skb2 == NULL)
5571 goto err;
5572
5573 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5574 nlh->nlmsg_seq);
5575 if (err < 0) {
5576 kfree_skb(skb2);
5577 goto err;
5578 }
5579
5580 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5581 nlmsg_report(nlh), GFP_KERNEL);
5582 return;
5583 err:
5584 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
5585 -ENOBUFS);
5586 }
5587
5588 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
5589 struct sk_buff *skb, const struct nlmsghdr *nlh,
5590 const struct nlattr * const nla[],
5591 struct netlink_ext_ack *extack)
5592 {
5593 struct sk_buff *skb2;
5594 int err;
5595
5596 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5597 if (skb2 == NULL)
5598 return -ENOMEM;
5599
5600 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
5601 nlh->nlmsg_seq);
5602 if (err < 0)
5603 goto err;
5604
5605 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
5606 err:
5607 kfree_skb(skb2);
5608 return err;
5609 }
5610
5611 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
5612 [NFT_MSG_NEWTABLE] = {
5613 .call_batch = nf_tables_newtable,
5614 .attr_count = NFTA_TABLE_MAX,
5615 .policy = nft_table_policy,
5616 },
5617 [NFT_MSG_GETTABLE] = {
5618 .call = nf_tables_gettable,
5619 .attr_count = NFTA_TABLE_MAX,
5620 .policy = nft_table_policy,
5621 },
5622 [NFT_MSG_DELTABLE] = {
5623 .call_batch = nf_tables_deltable,
5624 .attr_count = NFTA_TABLE_MAX,
5625 .policy = nft_table_policy,
5626 },
5627 [NFT_MSG_NEWCHAIN] = {
5628 .call_batch = nf_tables_newchain,
5629 .attr_count = NFTA_CHAIN_MAX,
5630 .policy = nft_chain_policy,
5631 },
5632 [NFT_MSG_GETCHAIN] = {
5633 .call = nf_tables_getchain,
5634 .attr_count = NFTA_CHAIN_MAX,
5635 .policy = nft_chain_policy,
5636 },
5637 [NFT_MSG_DELCHAIN] = {
5638 .call_batch = nf_tables_delchain,
5639 .attr_count = NFTA_CHAIN_MAX,
5640 .policy = nft_chain_policy,
5641 },
5642 [NFT_MSG_NEWRULE] = {
5643 .call_batch = nf_tables_newrule,
5644 .attr_count = NFTA_RULE_MAX,
5645 .policy = nft_rule_policy,
5646 },
5647 [NFT_MSG_GETRULE] = {
5648 .call = nf_tables_getrule,
5649 .attr_count = NFTA_RULE_MAX,
5650 .policy = nft_rule_policy,
5651 },
5652 [NFT_MSG_DELRULE] = {
5653 .call_batch = nf_tables_delrule,
5654 .attr_count = NFTA_RULE_MAX,
5655 .policy = nft_rule_policy,
5656 },
5657 [NFT_MSG_NEWSET] = {
5658 .call_batch = nf_tables_newset,
5659 .attr_count = NFTA_SET_MAX,
5660 .policy = nft_set_policy,
5661 },
5662 [NFT_MSG_GETSET] = {
5663 .call = nf_tables_getset,
5664 .attr_count = NFTA_SET_MAX,
5665 .policy = nft_set_policy,
5666 },
5667 [NFT_MSG_DELSET] = {
5668 .call_batch = nf_tables_delset,
5669 .attr_count = NFTA_SET_MAX,
5670 .policy = nft_set_policy,
5671 },
5672 [NFT_MSG_NEWSETELEM] = {
5673 .call_batch = nf_tables_newsetelem,
5674 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5675 .policy = nft_set_elem_list_policy,
5676 },
5677 [NFT_MSG_GETSETELEM] = {
5678 .call = nf_tables_getsetelem,
5679 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5680 .policy = nft_set_elem_list_policy,
5681 },
5682 [NFT_MSG_DELSETELEM] = {
5683 .call_batch = nf_tables_delsetelem,
5684 .attr_count = NFTA_SET_ELEM_LIST_MAX,
5685 .policy = nft_set_elem_list_policy,
5686 },
5687 [NFT_MSG_GETGEN] = {
5688 .call = nf_tables_getgen,
5689 },
5690 [NFT_MSG_NEWOBJ] = {
5691 .call_batch = nf_tables_newobj,
5692 .attr_count = NFTA_OBJ_MAX,
5693 .policy = nft_obj_policy,
5694 },
5695 [NFT_MSG_GETOBJ] = {
5696 .call = nf_tables_getobj,
5697 .attr_count = NFTA_OBJ_MAX,
5698 .policy = nft_obj_policy,
5699 },
5700 [NFT_MSG_DELOBJ] = {
5701 .call_batch = nf_tables_delobj,
5702 .attr_count = NFTA_OBJ_MAX,
5703 .policy = nft_obj_policy,
5704 },
5705 [NFT_MSG_GETOBJ_RESET] = {
5706 .call = nf_tables_getobj,
5707 .attr_count = NFTA_OBJ_MAX,
5708 .policy = nft_obj_policy,
5709 },
5710 [NFT_MSG_NEWFLOWTABLE] = {
5711 .call_batch = nf_tables_newflowtable,
5712 .attr_count = NFTA_FLOWTABLE_MAX,
5713 .policy = nft_flowtable_policy,
5714 },
5715 [NFT_MSG_GETFLOWTABLE] = {
5716 .call = nf_tables_getflowtable,
5717 .attr_count = NFTA_FLOWTABLE_MAX,
5718 .policy = nft_flowtable_policy,
5719 },
5720 [NFT_MSG_DELFLOWTABLE] = {
5721 .call_batch = nf_tables_delflowtable,
5722 .attr_count = NFTA_FLOWTABLE_MAX,
5723 .policy = nft_flowtable_policy,
5724 },
5725 };
5726
5727 static void nft_chain_commit_update(struct nft_trans *trans)
5728 {
5729 struct nft_base_chain *basechain;
5730
5731 if (nft_trans_chain_name(trans))
5732 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
5733
5734 if (!nft_is_base_chain(trans->ctx.chain))
5735 return;
5736
5737 basechain = nft_base_chain(trans->ctx.chain);
5738 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
5739
5740 switch (nft_trans_chain_policy(trans)) {
5741 case NF_DROP:
5742 case NF_ACCEPT:
5743 basechain->policy = nft_trans_chain_policy(trans);
5744 break;
5745 }
5746 }
5747
5748 static void nf_tables_commit_release(struct nft_trans *trans)
5749 {
5750 switch (trans->msg_type) {
5751 case NFT_MSG_DELTABLE:
5752 nf_tables_table_destroy(&trans->ctx);
5753 break;
5754 case NFT_MSG_DELCHAIN:
5755 nf_tables_chain_destroy(trans->ctx.chain);
5756 break;
5757 case NFT_MSG_DELRULE:
5758 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5759 break;
5760 case NFT_MSG_DELSET:
5761 nft_set_destroy(nft_trans_set(trans));
5762 break;
5763 case NFT_MSG_DELSETELEM:
5764 nf_tables_set_elem_destroy(nft_trans_elem_set(trans),
5765 nft_trans_elem(trans).priv);
5766 break;
5767 case NFT_MSG_DELOBJ:
5768 nft_obj_destroy(nft_trans_obj(trans));
5769 break;
5770 case NFT_MSG_DELFLOWTABLE:
5771 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
5772 break;
5773 }
5774 kfree(trans);
5775 }
5776
5777 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
5778 {
5779 struct nft_trans *trans, *next;
5780 struct nft_trans_elem *te;
5781
5782 /* Bump generation counter, invalidate any dump in progress */
5783 while (++net->nft.base_seq == 0);
5784
5785 /* A new generation has just started */
5786 net->nft.gencursor = nft_gencursor_next(net);
5787
5788 /* Make sure all packets have left the previous generation before
5789 * purging old rules.
5790 */
5791 synchronize_rcu();
5792
5793 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5794 switch (trans->msg_type) {
5795 case NFT_MSG_NEWTABLE:
5796 if (nft_trans_table_update(trans)) {
5797 if (!nft_trans_table_enable(trans)) {
5798 nf_tables_table_disable(net,
5799 trans->ctx.afi,
5800 trans->ctx.table);
5801 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5802 }
5803 } else {
5804 nft_clear(net, trans->ctx.table);
5805 }
5806 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
5807 nft_trans_destroy(trans);
5808 break;
5809 case NFT_MSG_DELTABLE:
5810 list_del_rcu(&trans->ctx.table->list);
5811 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
5812 break;
5813 case NFT_MSG_NEWCHAIN:
5814 if (nft_trans_chain_update(trans))
5815 nft_chain_commit_update(trans);
5816 else
5817 nft_clear(net, trans->ctx.chain);
5818
5819 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
5820 nft_trans_destroy(trans);
5821 break;
5822 case NFT_MSG_DELCHAIN:
5823 list_del_rcu(&trans->ctx.chain->list);
5824 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
5825 nf_tables_unregister_hook(trans->ctx.net,
5826 trans->ctx.table,
5827 trans->ctx.chain);
5828 break;
5829 case NFT_MSG_NEWRULE:
5830 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5831 nf_tables_rule_notify(&trans->ctx,
5832 nft_trans_rule(trans),
5833 NFT_MSG_NEWRULE);
5834 nft_trans_destroy(trans);
5835 break;
5836 case NFT_MSG_DELRULE:
5837 list_del_rcu(&nft_trans_rule(trans)->list);
5838 nf_tables_rule_notify(&trans->ctx,
5839 nft_trans_rule(trans),
5840 NFT_MSG_DELRULE);
5841 break;
5842 case NFT_MSG_NEWSET:
5843 nft_clear(net, nft_trans_set(trans));
5844 /* This avoids hitting -EBUSY when deleting the table
5845 * from the transaction.
5846 */
5847 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
5848 !list_empty(&nft_trans_set(trans)->bindings))
5849 trans->ctx.table->use--;
5850
5851 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5852 NFT_MSG_NEWSET, GFP_KERNEL);
5853 nft_trans_destroy(trans);
5854 break;
5855 case NFT_MSG_DELSET:
5856 list_del_rcu(&nft_trans_set(trans)->list);
5857 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
5858 NFT_MSG_DELSET, GFP_KERNEL);
5859 break;
5860 case NFT_MSG_NEWSETELEM:
5861 te = (struct nft_trans_elem *)trans->data;
5862
5863 te->set->ops->activate(net, te->set, &te->elem);
5864 nf_tables_setelem_notify(&trans->ctx, te->set,
5865 &te->elem,
5866 NFT_MSG_NEWSETELEM, 0);
5867 nft_trans_destroy(trans);
5868 break;
5869 case NFT_MSG_DELSETELEM:
5870 te = (struct nft_trans_elem *)trans->data;
5871
5872 nf_tables_setelem_notify(&trans->ctx, te->set,
5873 &te->elem,
5874 NFT_MSG_DELSETELEM, 0);
5875 te->set->ops->remove(net, te->set, &te->elem);
5876 atomic_dec(&te->set->nelems);
5877 te->set->ndeact--;
5878 break;
5879 case NFT_MSG_NEWOBJ:
5880 nft_clear(net, nft_trans_obj(trans));
5881 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5882 NFT_MSG_NEWOBJ);
5883 nft_trans_destroy(trans);
5884 break;
5885 case NFT_MSG_DELOBJ:
5886 list_del_rcu(&nft_trans_obj(trans)->list);
5887 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
5888 NFT_MSG_DELOBJ);
5889 break;
5890 case NFT_MSG_NEWFLOWTABLE:
5891 nft_clear(net, nft_trans_flowtable(trans));
5892 nf_tables_flowtable_notify(&trans->ctx,
5893 nft_trans_flowtable(trans),
5894 NFT_MSG_NEWFLOWTABLE);
5895 nft_trans_destroy(trans);
5896 break;
5897 case NFT_MSG_DELFLOWTABLE:
5898 list_del_rcu(&nft_trans_flowtable(trans)->list);
5899 nf_tables_flowtable_notify(&trans->ctx,
5900 nft_trans_flowtable(trans),
5901 NFT_MSG_DELFLOWTABLE);
5902 nft_unregister_flowtable_net_hooks(net,
5903 nft_trans_flowtable(trans));
5904 break;
5905 }
5906 }
5907
5908 synchronize_rcu();
5909
5910 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
5911 list_del(&trans->list);
5912 nf_tables_commit_release(trans);
5913 }
5914
5915 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
5916
5917 return 0;
5918 }
5919
5920 static void nf_tables_abort_release(struct nft_trans *trans)
5921 {
5922 switch (trans->msg_type) {
5923 case NFT_MSG_NEWTABLE:
5924 nf_tables_table_destroy(&trans->ctx);
5925 break;
5926 case NFT_MSG_NEWCHAIN:
5927 nf_tables_chain_destroy(trans->ctx.chain);
5928 break;
5929 case NFT_MSG_NEWRULE:
5930 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
5931 break;
5932 case NFT_MSG_NEWSET:
5933 nft_set_destroy(nft_trans_set(trans));
5934 break;
5935 case NFT_MSG_NEWSETELEM:
5936 nft_set_elem_destroy(nft_trans_elem_set(trans),
5937 nft_trans_elem(trans).priv, true);
5938 break;
5939 case NFT_MSG_NEWOBJ:
5940 nft_obj_destroy(nft_trans_obj(trans));
5941 break;
5942 case NFT_MSG_NEWFLOWTABLE:
5943 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
5944 break;
5945 }
5946 kfree(trans);
5947 }
5948
5949 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
5950 {
5951 struct nft_trans *trans, *next;
5952 struct nft_trans_elem *te;
5953
5954 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
5955 list) {
5956 switch (trans->msg_type) {
5957 case NFT_MSG_NEWTABLE:
5958 if (nft_trans_table_update(trans)) {
5959 if (nft_trans_table_enable(trans)) {
5960 nf_tables_table_disable(net,
5961 trans->ctx.afi,
5962 trans->ctx.table);
5963 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
5964 }
5965 nft_trans_destroy(trans);
5966 } else {
5967 list_del_rcu(&trans->ctx.table->list);
5968 }
5969 break;
5970 case NFT_MSG_DELTABLE:
5971 nft_clear(trans->ctx.net, trans->ctx.table);
5972 nft_trans_destroy(trans);
5973 break;
5974 case NFT_MSG_NEWCHAIN:
5975 if (nft_trans_chain_update(trans)) {
5976 free_percpu(nft_trans_chain_stats(trans));
5977
5978 nft_trans_destroy(trans);
5979 } else {
5980 trans->ctx.table->use--;
5981 list_del_rcu(&trans->ctx.chain->list);
5982 nf_tables_unregister_hook(trans->ctx.net,
5983 trans->ctx.table,
5984 trans->ctx.chain);
5985 }
5986 break;
5987 case NFT_MSG_DELCHAIN:
5988 trans->ctx.table->use++;
5989 nft_clear(trans->ctx.net, trans->ctx.chain);
5990 nft_trans_destroy(trans);
5991 break;
5992 case NFT_MSG_NEWRULE:
5993 trans->ctx.chain->use--;
5994 list_del_rcu(&nft_trans_rule(trans)->list);
5995 break;
5996 case NFT_MSG_DELRULE:
5997 trans->ctx.chain->use++;
5998 nft_clear(trans->ctx.net, nft_trans_rule(trans));
5999 nft_trans_destroy(trans);
6000 break;
6001 case NFT_MSG_NEWSET:
6002 trans->ctx.table->use--;
6003 list_del_rcu(&nft_trans_set(trans)->list);
6004 break;
6005 case NFT_MSG_DELSET:
6006 trans->ctx.table->use++;
6007 nft_clear(trans->ctx.net, nft_trans_set(trans));
6008 nft_trans_destroy(trans);
6009 break;
6010 case NFT_MSG_NEWSETELEM:
6011 te = (struct nft_trans_elem *)trans->data;
6012
6013 te->set->ops->remove(net, te->set, &te->elem);
6014 atomic_dec(&te->set->nelems);
6015 break;
6016 case NFT_MSG_DELSETELEM:
6017 te = (struct nft_trans_elem *)trans->data;
6018
6019 nft_set_elem_activate(net, te->set, &te->elem);
6020 te->set->ops->activate(net, te->set, &te->elem);
6021 te->set->ndeact--;
6022
6023 nft_trans_destroy(trans);
6024 break;
6025 case NFT_MSG_NEWOBJ:
6026 trans->ctx.table->use--;
6027 list_del_rcu(&nft_trans_obj(trans)->list);
6028 break;
6029 case NFT_MSG_DELOBJ:
6030 trans->ctx.table->use++;
6031 nft_clear(trans->ctx.net, nft_trans_obj(trans));
6032 nft_trans_destroy(trans);
6033 break;
6034 case NFT_MSG_NEWFLOWTABLE:
6035 trans->ctx.table->use--;
6036 list_del_rcu(&nft_trans_flowtable(trans)->list);
6037 nft_unregister_flowtable_net_hooks(net,
6038 nft_trans_flowtable(trans));
6039 break;
6040 case NFT_MSG_DELFLOWTABLE:
6041 trans->ctx.table->use++;
6042 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
6043 nft_trans_destroy(trans);
6044 break;
6045 }
6046 }
6047
6048 synchronize_rcu();
6049
6050 list_for_each_entry_safe_reverse(trans, next,
6051 &net->nft.commit_list, list) {
6052 list_del(&trans->list);
6053 nf_tables_abort_release(trans);
6054 }
6055
6056 return 0;
6057 }
6058
6059 static bool nf_tables_valid_genid(struct net *net, u32 genid)
6060 {
6061 return net->nft.base_seq == genid;
6062 }
6063
6064 static const struct nfnetlink_subsystem nf_tables_subsys = {
6065 .name = "nf_tables",
6066 .subsys_id = NFNL_SUBSYS_NFTABLES,
6067 .cb_count = NFT_MSG_MAX,
6068 .cb = nf_tables_cb,
6069 .commit = nf_tables_commit,
6070 .abort = nf_tables_abort,
6071 .valid_genid = nf_tables_valid_genid,
6072 };
6073
6074 int nft_chain_validate_dependency(const struct nft_chain *chain,
6075 enum nft_chain_type type)
6076 {
6077 const struct nft_base_chain *basechain;
6078
6079 if (nft_is_base_chain(chain)) {
6080 basechain = nft_base_chain(chain);
6081 if (basechain->type->type != type)
6082 return -EOPNOTSUPP;
6083 }
6084 return 0;
6085 }
6086 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
6087
6088 int nft_chain_validate_hooks(const struct nft_chain *chain,
6089 unsigned int hook_flags)
6090 {
6091 struct nft_base_chain *basechain;
6092
6093 if (nft_is_base_chain(chain)) {
6094 basechain = nft_base_chain(chain);
6095
6096 if ((1 << basechain->ops.hooknum) & hook_flags)
6097 return 0;
6098
6099 return -EOPNOTSUPP;
6100 }
6101
6102 return 0;
6103 }
6104 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
6105
6106 /*
6107 * Loop detection - walk through the ruleset beginning at the destination chain
6108 * of a new jump until either the source chain is reached (loop) or all
6109 * reachable chains have been traversed.
6110 *
6111 * The loop check is performed whenever a new jump verdict is added to an
6112 * expression or verdict map or a verdict map is bound to a new chain.
6113 */
6114
6115 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6116 const struct nft_chain *chain);
6117
6118 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
6119 struct nft_set *set,
6120 const struct nft_set_iter *iter,
6121 struct nft_set_elem *elem)
6122 {
6123 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6124 const struct nft_data *data;
6125
6126 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6127 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
6128 return 0;
6129
6130 data = nft_set_ext_data(ext);
6131 switch (data->verdict.code) {
6132 case NFT_JUMP:
6133 case NFT_GOTO:
6134 return nf_tables_check_loops(ctx, data->verdict.chain);
6135 default:
6136 return 0;
6137 }
6138 }
6139
6140 static int nf_tables_check_loops(const struct nft_ctx *ctx,
6141 const struct nft_chain *chain)
6142 {
6143 const struct nft_rule *rule;
6144 const struct nft_expr *expr, *last;
6145 struct nft_set *set;
6146 struct nft_set_binding *binding;
6147 struct nft_set_iter iter;
6148
6149 if (ctx->chain == chain)
6150 return -ELOOP;
6151
6152 list_for_each_entry(rule, &chain->rules, list) {
6153 nft_rule_for_each_expr(expr, last, rule) {
6154 const struct nft_data *data = NULL;
6155 int err;
6156
6157 if (!expr->ops->validate)
6158 continue;
6159
6160 err = expr->ops->validate(ctx, expr, &data);
6161 if (err < 0)
6162 return err;
6163
6164 if (data == NULL)
6165 continue;
6166
6167 switch (data->verdict.code) {
6168 case NFT_JUMP:
6169 case NFT_GOTO:
6170 err = nf_tables_check_loops(ctx,
6171 data->verdict.chain);
6172 if (err < 0)
6173 return err;
6174 default:
6175 break;
6176 }
6177 }
6178 }
6179
6180 list_for_each_entry(set, &ctx->table->sets, list) {
6181 if (!nft_is_active_next(ctx->net, set))
6182 continue;
6183 if (!(set->flags & NFT_SET_MAP) ||
6184 set->dtype != NFT_DATA_VERDICT)
6185 continue;
6186
6187 list_for_each_entry(binding, &set->bindings, list) {
6188 if (!(binding->flags & NFT_SET_MAP) ||
6189 binding->chain != chain)
6190 continue;
6191
6192 iter.genmask = nft_genmask_next(ctx->net);
6193 iter.skip = 0;
6194 iter.count = 0;
6195 iter.err = 0;
6196 iter.fn = nf_tables_loop_check_setelem;
6197
6198 set->ops->walk(ctx, set, &iter);
6199 if (iter.err < 0)
6200 return iter.err;
6201 }
6202 }
6203
6204 return 0;
6205 }
6206
6207 /**
6208 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
6209 *
6210 * @attr: netlink attribute to fetch value from
6211 * @max: maximum value to be stored in dest
6212 * @dest: pointer to the variable
6213 *
6214 * Parse, check and store a given u32 netlink attribute into variable.
6215 * This function returns -ERANGE if the value goes over maximum value.
6216 * Otherwise a 0 is returned and the attribute value is stored in the
6217 * destination variable.
6218 */
6219 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
6220 {
6221 u32 val;
6222
6223 val = ntohl(nla_get_be32(attr));
6224 if (val > max)
6225 return -ERANGE;
6226
6227 *dest = val;
6228 return 0;
6229 }
6230 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
6231
6232 /**
6233 * nft_parse_register - parse a register value from a netlink attribute
6234 *
6235 * @attr: netlink attribute
6236 *
6237 * Parse and translate a register value from a netlink attribute.
6238 * Registers used to be 128 bit wide, these register numbers will be
6239 * mapped to the corresponding 32 bit register numbers.
6240 */
6241 unsigned int nft_parse_register(const struct nlattr *attr)
6242 {
6243 unsigned int reg;
6244
6245 reg = ntohl(nla_get_be32(attr));
6246 switch (reg) {
6247 case NFT_REG_VERDICT...NFT_REG_4:
6248 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
6249 default:
6250 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
6251 }
6252 }
6253 EXPORT_SYMBOL_GPL(nft_parse_register);
6254
6255 /**
6256 * nft_dump_register - dump a register value to a netlink attribute
6257 *
6258 * @skb: socket buffer
6259 * @attr: attribute number
6260 * @reg: register number
6261 *
6262 * Construct a netlink attribute containing the register number. For
6263 * compatibility reasons, register numbers being a multiple of 4 are
6264 * translated to the corresponding 128 bit register numbers.
6265 */
6266 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
6267 {
6268 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
6269 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
6270 else
6271 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
6272
6273 return nla_put_be32(skb, attr, htonl(reg));
6274 }
6275 EXPORT_SYMBOL_GPL(nft_dump_register);
6276
6277 /**
6278 * nft_validate_register_load - validate a load from a register
6279 *
6280 * @reg: the register number
6281 * @len: the length of the data
6282 *
6283 * Validate that the input register is one of the general purpose
6284 * registers and that the length of the load is within the bounds.
6285 */
6286 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
6287 {
6288 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6289 return -EINVAL;
6290 if (len == 0)
6291 return -EINVAL;
6292 if (reg * NFT_REG32_SIZE + len > FIELD_SIZEOF(struct nft_regs, data))
6293 return -ERANGE;
6294
6295 return 0;
6296 }
6297 EXPORT_SYMBOL_GPL(nft_validate_register_load);
6298
6299 /**
6300 * nft_validate_register_store - validate an expressions' register store
6301 *
6302 * @ctx: context of the expression performing the load
6303 * @reg: the destination register number
6304 * @data: the data to load
6305 * @type: the data type
6306 * @len: the length of the data
6307 *
6308 * Validate that a data load uses the appropriate data type for
6309 * the destination register and the length is within the bounds.
6310 * A value of NULL for the data means that its runtime gathered
6311 * data.
6312 */
6313 int nft_validate_register_store(const struct nft_ctx *ctx,
6314 enum nft_registers reg,
6315 const struct nft_data *data,
6316 enum nft_data_types type, unsigned int len)
6317 {
6318 int err;
6319
6320 switch (reg) {
6321 case NFT_REG_VERDICT:
6322 if (type != NFT_DATA_VERDICT)
6323 return -EINVAL;
6324
6325 if (data != NULL &&
6326 (data->verdict.code == NFT_GOTO ||
6327 data->verdict.code == NFT_JUMP)) {
6328 err = nf_tables_check_loops(ctx, data->verdict.chain);
6329 if (err < 0)
6330 return err;
6331
6332 if (ctx->chain->level + 1 >
6333 data->verdict.chain->level) {
6334 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
6335 return -EMLINK;
6336 data->verdict.chain->level = ctx->chain->level + 1;
6337 }
6338 }
6339
6340 return 0;
6341 default:
6342 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
6343 return -EINVAL;
6344 if (len == 0)
6345 return -EINVAL;
6346 if (reg * NFT_REG32_SIZE + len >
6347 FIELD_SIZEOF(struct nft_regs, data))
6348 return -ERANGE;
6349
6350 if (data != NULL && type != NFT_DATA_VALUE)
6351 return -EINVAL;
6352 return 0;
6353 }
6354 }
6355 EXPORT_SYMBOL_GPL(nft_validate_register_store);
6356
6357 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
6358 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
6359 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
6360 .len = NFT_CHAIN_MAXNAMELEN - 1 },
6361 };
6362
6363 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
6364 struct nft_data_desc *desc, const struct nlattr *nla)
6365 {
6366 u8 genmask = nft_genmask_next(ctx->net);
6367 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
6368 struct nft_chain *chain;
6369 int err;
6370
6371 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy,
6372 NULL);
6373 if (err < 0)
6374 return err;
6375
6376 if (!tb[NFTA_VERDICT_CODE])
6377 return -EINVAL;
6378 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
6379
6380 switch (data->verdict.code) {
6381 default:
6382 switch (data->verdict.code & NF_VERDICT_MASK) {
6383 case NF_ACCEPT:
6384 case NF_DROP:
6385 case NF_QUEUE:
6386 break;
6387 default:
6388 return -EINVAL;
6389 }
6390 /* fall through */
6391 case NFT_CONTINUE:
6392 case NFT_BREAK:
6393 case NFT_RETURN:
6394 break;
6395 case NFT_JUMP:
6396 case NFT_GOTO:
6397 if (!tb[NFTA_VERDICT_CHAIN])
6398 return -EINVAL;
6399 chain = nf_tables_chain_lookup(ctx->table,
6400 tb[NFTA_VERDICT_CHAIN], genmask);
6401 if (IS_ERR(chain))
6402 return PTR_ERR(chain);
6403 if (nft_is_base_chain(chain))
6404 return -EOPNOTSUPP;
6405
6406 chain->use++;
6407 data->verdict.chain = chain;
6408 break;
6409 }
6410
6411 desc->len = sizeof(data->verdict);
6412 desc->type = NFT_DATA_VERDICT;
6413 return 0;
6414 }
6415
6416 static void nft_verdict_uninit(const struct nft_data *data)
6417 {
6418 switch (data->verdict.code) {
6419 case NFT_JUMP:
6420 case NFT_GOTO:
6421 data->verdict.chain->use--;
6422 break;
6423 }
6424 }
6425
6426 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
6427 {
6428 struct nlattr *nest;
6429
6430 nest = nla_nest_start(skb, type);
6431 if (!nest)
6432 goto nla_put_failure;
6433
6434 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
6435 goto nla_put_failure;
6436
6437 switch (v->code) {
6438 case NFT_JUMP:
6439 case NFT_GOTO:
6440 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
6441 v->chain->name))
6442 goto nla_put_failure;
6443 }
6444 nla_nest_end(skb, nest);
6445 return 0;
6446
6447 nla_put_failure:
6448 return -1;
6449 }
6450
6451 static int nft_value_init(const struct nft_ctx *ctx,
6452 struct nft_data *data, unsigned int size,
6453 struct nft_data_desc *desc, const struct nlattr *nla)
6454 {
6455 unsigned int len;
6456
6457 len = nla_len(nla);
6458 if (len == 0)
6459 return -EINVAL;
6460 if (len > size)
6461 return -EOVERFLOW;
6462
6463 nla_memcpy(data->data, nla, len);
6464 desc->type = NFT_DATA_VALUE;
6465 desc->len = len;
6466 return 0;
6467 }
6468
6469 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
6470 unsigned int len)
6471 {
6472 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
6473 }
6474
6475 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
6476 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
6477 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
6478 };
6479
6480 /**
6481 * nft_data_init - parse nf_tables data netlink attributes
6482 *
6483 * @ctx: context of the expression using the data
6484 * @data: destination struct nft_data
6485 * @size: maximum data length
6486 * @desc: data description
6487 * @nla: netlink attribute containing data
6488 *
6489 * Parse the netlink data attributes and initialize a struct nft_data.
6490 * The type and length of data are returned in the data description.
6491 *
6492 * The caller can indicate that it only wants to accept data of type
6493 * NFT_DATA_VALUE by passing NULL for the ctx argument.
6494 */
6495 int nft_data_init(const struct nft_ctx *ctx,
6496 struct nft_data *data, unsigned int size,
6497 struct nft_data_desc *desc, const struct nlattr *nla)
6498 {
6499 struct nlattr *tb[NFTA_DATA_MAX + 1];
6500 int err;
6501
6502 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy, NULL);
6503 if (err < 0)
6504 return err;
6505
6506 if (tb[NFTA_DATA_VALUE])
6507 return nft_value_init(ctx, data, size, desc,
6508 tb[NFTA_DATA_VALUE]);
6509 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
6510 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
6511 return -EINVAL;
6512 }
6513 EXPORT_SYMBOL_GPL(nft_data_init);
6514
6515 /**
6516 * nft_data_release - release a nft_data item
6517 *
6518 * @data: struct nft_data to release
6519 * @type: type of data
6520 *
6521 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6522 * all others need to be released by calling this function.
6523 */
6524 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
6525 {
6526 if (type < NFT_DATA_VERDICT)
6527 return;
6528 switch (type) {
6529 case NFT_DATA_VERDICT:
6530 return nft_verdict_uninit(data);
6531 default:
6532 WARN_ON(1);
6533 }
6534 }
6535 EXPORT_SYMBOL_GPL(nft_data_release);
6536
6537 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
6538 enum nft_data_types type, unsigned int len)
6539 {
6540 struct nlattr *nest;
6541 int err;
6542
6543 nest = nla_nest_start(skb, attr);
6544 if (nest == NULL)
6545 return -1;
6546
6547 switch (type) {
6548 case NFT_DATA_VALUE:
6549 err = nft_value_dump(skb, data, len);
6550 break;
6551 case NFT_DATA_VERDICT:
6552 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
6553 break;
6554 default:
6555 err = -EINVAL;
6556 WARN_ON(1);
6557 }
6558
6559 nla_nest_end(skb, nest);
6560 return err;
6561 }
6562 EXPORT_SYMBOL_GPL(nft_data_dump);
6563
6564 static int __net_init nf_tables_init_net(struct net *net)
6565 {
6566 INIT_LIST_HEAD(&net->nft.af_info);
6567 INIT_LIST_HEAD(&net->nft.commit_list);
6568 net->nft.base_seq = 1;
6569 return 0;
6570 }
6571
6572 static void __net_exit nf_tables_exit_net(struct net *net)
6573 {
6574 WARN_ON_ONCE(!list_empty(&net->nft.af_info));
6575 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
6576 }
6577
6578 int __nft_release_basechain(struct nft_ctx *ctx)
6579 {
6580 struct nft_rule *rule, *nr;
6581
6582 BUG_ON(!nft_is_base_chain(ctx->chain));
6583
6584 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
6585 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
6586 list_del(&rule->list);
6587 ctx->chain->use--;
6588 nf_tables_rule_destroy(ctx, rule);
6589 }
6590 list_del(&ctx->chain->list);
6591 ctx->table->use--;
6592 nf_tables_chain_destroy(ctx->chain);
6593
6594 return 0;
6595 }
6596 EXPORT_SYMBOL_GPL(__nft_release_basechain);
6597
6598 /* Called by nft_unregister_afinfo() from __net_exit path, nfnl_lock is held. */
6599 static void __nft_release_afinfo(struct net *net, struct nft_af_info *afi)
6600 {
6601 struct nft_flowtable *flowtable, *nf;
6602 struct nft_table *table, *nt;
6603 struct nft_chain *chain, *nc;
6604 struct nft_object *obj, *ne;
6605 struct nft_rule *rule, *nr;
6606 struct nft_set *set, *ns;
6607 struct nft_ctx ctx = {
6608 .net = net,
6609 .afi = afi,
6610 };
6611
6612 list_for_each_entry_safe(table, nt, &afi->tables, list) {
6613 list_for_each_entry(chain, &table->chains, list)
6614 nf_tables_unregister_hook(net, table, chain);
6615 list_for_each_entry(flowtable, &table->flowtables, list)
6616 nf_unregister_net_hooks(net, flowtable->ops,
6617 flowtable->ops_len);
6618 /* No packets are walking on these chains anymore. */
6619 ctx.table = table;
6620 list_for_each_entry(chain, &table->chains, list) {
6621 ctx.chain = chain;
6622 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
6623 list_del(&rule->list);
6624 chain->use--;
6625 nf_tables_rule_destroy(&ctx, rule);
6626 }
6627 }
6628 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
6629 list_del(&flowtable->list);
6630 table->use--;
6631 nf_tables_flowtable_destroy(flowtable);
6632 }
6633 list_for_each_entry_safe(set, ns, &table->sets, list) {
6634 list_del(&set->list);
6635 table->use--;
6636 nft_set_destroy(set);
6637 }
6638 list_for_each_entry_safe(obj, ne, &table->objects, list) {
6639 list_del(&obj->list);
6640 table->use--;
6641 nft_obj_destroy(obj);
6642 }
6643 list_for_each_entry_safe(chain, nc, &table->chains, list) {
6644 list_del(&chain->list);
6645 table->use--;
6646 nf_tables_chain_destroy(chain);
6647 }
6648 list_del(&table->list);
6649 nf_tables_table_destroy(&ctx);
6650 }
6651 }
6652
6653 static struct pernet_operations nf_tables_net_ops = {
6654 .init = nf_tables_init_net,
6655 .exit = nf_tables_exit_net,
6656 };
6657
6658 static int __init nf_tables_module_init(void)
6659 {
6660 int err;
6661
6662 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
6663 GFP_KERNEL);
6664 if (info == NULL) {
6665 err = -ENOMEM;
6666 goto err1;
6667 }
6668
6669 err = nf_tables_core_module_init();
6670 if (err < 0)
6671 goto err2;
6672
6673 err = nfnetlink_subsys_register(&nf_tables_subsys);
6674 if (err < 0)
6675 goto err3;
6676
6677 register_netdevice_notifier(&nf_tables_flowtable_notifier);
6678
6679 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
6680 return register_pernet_subsys(&nf_tables_net_ops);
6681 err3:
6682 nf_tables_core_module_exit();
6683 err2:
6684 kfree(info);
6685 err1:
6686 return err;
6687 }
6688
6689 static void __exit nf_tables_module_exit(void)
6690 {
6691 unregister_pernet_subsys(&nf_tables_net_ops);
6692 nfnetlink_subsys_unregister(&nf_tables_subsys);
6693 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
6694 rcu_barrier();
6695 nf_tables_core_module_exit();
6696 kfree(info);
6697 }
6698
6699 module_init(nf_tables_module_init);
6700 module_exit(nf_tables_module_exit);
6701
6702 MODULE_LICENSE("GPL");
6703 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
6704 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
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