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netfilter: nf_tables: simplify set dump through netlink
[deliverable/linux.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/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
22 #include <net/sock.h>
23
24 static LIST_HEAD(nf_tables_expressions);
25
26 /**
27 * nft_register_afinfo - register nf_tables address family info
28 *
29 * @afi: address family info to register
30 *
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
33 */
34 int nft_register_afinfo(struct net *net, struct nft_af_info *afi)
35 {
36 INIT_LIST_HEAD(&afi->tables);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES);
38 list_add_tail_rcu(&afi->list, &net->nft.af_info);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
40 return 0;
41 }
42 EXPORT_SYMBOL_GPL(nft_register_afinfo);
43
44 /**
45 * nft_unregister_afinfo - unregister nf_tables address family info
46 *
47 * @afi: address family info to unregister
48 *
49 * Unregister the address family for use with nf_tables.
50 */
51 void nft_unregister_afinfo(struct nft_af_info *afi)
52 {
53 nfnl_lock(NFNL_SUBSYS_NFTABLES);
54 list_del_rcu(&afi->list);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
56 }
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo);
58
59 static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family)
60 {
61 struct nft_af_info *afi;
62
63 list_for_each_entry(afi, &net->nft.af_info, list) {
64 if (afi->family == family)
65 return afi;
66 }
67 return NULL;
68 }
69
70 static struct nft_af_info *
71 nf_tables_afinfo_lookup(struct net *net, int family, bool autoload)
72 {
73 struct nft_af_info *afi;
74
75 afi = nft_afinfo_lookup(net, family);
76 if (afi != NULL)
77 return afi;
78 #ifdef CONFIG_MODULES
79 if (autoload) {
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
81 request_module("nft-afinfo-%u", family);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES);
83 afi = nft_afinfo_lookup(net, family);
84 if (afi != NULL)
85 return ERR_PTR(-EAGAIN);
86 }
87 #endif
88 return ERR_PTR(-EAFNOSUPPORT);
89 }
90
91 static void nft_ctx_init(struct nft_ctx *ctx,
92 const struct sk_buff *skb,
93 const struct nlmsghdr *nlh,
94 struct nft_af_info *afi,
95 struct nft_table *table,
96 struct nft_chain *chain,
97 const struct nlattr * const *nla)
98 {
99 ctx->net = sock_net(skb->sk);
100 ctx->afi = afi;
101 ctx->table = table;
102 ctx->chain = chain;
103 ctx->nla = nla;
104 ctx->portid = NETLINK_CB(skb).portid;
105 ctx->report = nlmsg_report(nlh);
106 ctx->seq = nlh->nlmsg_seq;
107 }
108
109 static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type,
110 u32 size)
111 {
112 struct nft_trans *trans;
113
114 trans = kzalloc(sizeof(struct nft_trans) + size, GFP_KERNEL);
115 if (trans == NULL)
116 return NULL;
117
118 trans->msg_type = msg_type;
119 trans->ctx = *ctx;
120
121 return trans;
122 }
123
124 static void nft_trans_destroy(struct nft_trans *trans)
125 {
126 list_del(&trans->list);
127 kfree(trans);
128 }
129
130 /*
131 * Tables
132 */
133
134 static struct nft_table *nft_table_lookup(const struct nft_af_info *afi,
135 const struct nlattr *nla)
136 {
137 struct nft_table *table;
138
139 list_for_each_entry(table, &afi->tables, list) {
140 if (!nla_strcmp(nla, table->name))
141 return table;
142 }
143 return NULL;
144 }
145
146 static struct nft_table *nf_tables_table_lookup(const struct nft_af_info *afi,
147 const struct nlattr *nla)
148 {
149 struct nft_table *table;
150
151 if (nla == NULL)
152 return ERR_PTR(-EINVAL);
153
154 table = nft_table_lookup(afi, nla);
155 if (table != NULL)
156 return table;
157
158 return ERR_PTR(-ENOENT);
159 }
160
161 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
162 {
163 return ++table->hgenerator;
164 }
165
166 static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX];
167
168 static const struct nf_chain_type *
169 __nf_tables_chain_type_lookup(int family, const struct nlattr *nla)
170 {
171 int i;
172
173 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
174 if (chain_type[family][i] != NULL &&
175 !nla_strcmp(nla, chain_type[family][i]->name))
176 return chain_type[family][i];
177 }
178 return NULL;
179 }
180
181 static const struct nf_chain_type *
182 nf_tables_chain_type_lookup(const struct nft_af_info *afi,
183 const struct nlattr *nla,
184 bool autoload)
185 {
186 const struct nf_chain_type *type;
187
188 type = __nf_tables_chain_type_lookup(afi->family, nla);
189 if (type != NULL)
190 return type;
191 #ifdef CONFIG_MODULES
192 if (autoload) {
193 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
194 request_module("nft-chain-%u-%.*s", afi->family,
195 nla_len(nla), (const char *)nla_data(nla));
196 nfnl_lock(NFNL_SUBSYS_NFTABLES);
197 type = __nf_tables_chain_type_lookup(afi->family, nla);
198 if (type != NULL)
199 return ERR_PTR(-EAGAIN);
200 }
201 #endif
202 return ERR_PTR(-ENOENT);
203 }
204
205 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
206 [NFTA_TABLE_NAME] = { .type = NLA_STRING },
207 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
208 };
209
210 static int nf_tables_fill_table_info(struct sk_buff *skb, u32 portid, u32 seq,
211 int event, u32 flags, int family,
212 const struct nft_table *table)
213 {
214 struct nlmsghdr *nlh;
215 struct nfgenmsg *nfmsg;
216
217 event |= NFNL_SUBSYS_NFTABLES << 8;
218 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
219 if (nlh == NULL)
220 goto nla_put_failure;
221
222 nfmsg = nlmsg_data(nlh);
223 nfmsg->nfgen_family = family;
224 nfmsg->version = NFNETLINK_V0;
225 nfmsg->res_id = 0;
226
227 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
228 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
229 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
230 goto nla_put_failure;
231
232 return nlmsg_end(skb, nlh);
233
234 nla_put_failure:
235 nlmsg_trim(skb, nlh);
236 return -1;
237 }
238
239 static int nf_tables_table_notify(const struct nft_ctx *ctx, int event)
240 {
241 struct sk_buff *skb;
242 int err;
243
244 if (!ctx->report &&
245 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
246 return 0;
247
248 err = -ENOBUFS;
249 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
250 if (skb == NULL)
251 goto err;
252
253 err = nf_tables_fill_table_info(skb, ctx->portid, ctx->seq, event, 0,
254 ctx->afi->family, ctx->table);
255 if (err < 0) {
256 kfree_skb(skb);
257 goto err;
258 }
259
260 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
261 ctx->report, GFP_KERNEL);
262 err:
263 if (err < 0) {
264 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
265 err);
266 }
267 return err;
268 }
269
270 static int nf_tables_dump_tables(struct sk_buff *skb,
271 struct netlink_callback *cb)
272 {
273 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
274 const struct nft_af_info *afi;
275 const struct nft_table *table;
276 unsigned int idx = 0, s_idx = cb->args[0];
277 struct net *net = sock_net(skb->sk);
278 int family = nfmsg->nfgen_family;
279
280 rcu_read_lock();
281 cb->seq = net->nft.base_seq;
282
283 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
284 if (family != NFPROTO_UNSPEC && family != afi->family)
285 continue;
286
287 list_for_each_entry_rcu(table, &afi->tables, list) {
288 if (idx < s_idx)
289 goto cont;
290 if (idx > s_idx)
291 memset(&cb->args[1], 0,
292 sizeof(cb->args) - sizeof(cb->args[0]));
293 if (nf_tables_fill_table_info(skb,
294 NETLINK_CB(cb->skb).portid,
295 cb->nlh->nlmsg_seq,
296 NFT_MSG_NEWTABLE,
297 NLM_F_MULTI,
298 afi->family, table) < 0)
299 goto done;
300
301 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
302 cont:
303 idx++;
304 }
305 }
306 done:
307 rcu_read_unlock();
308 cb->args[0] = idx;
309 return skb->len;
310 }
311
312 /* Internal table flags */
313 #define NFT_TABLE_INACTIVE (1 << 15)
314
315 static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb,
316 const struct nlmsghdr *nlh,
317 const struct nlattr * const nla[])
318 {
319 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
320 const struct nft_af_info *afi;
321 const struct nft_table *table;
322 struct sk_buff *skb2;
323 struct net *net = sock_net(skb->sk);
324 int family = nfmsg->nfgen_family;
325 int err;
326
327 if (nlh->nlmsg_flags & NLM_F_DUMP) {
328 struct netlink_dump_control c = {
329 .dump = nf_tables_dump_tables,
330 };
331 return netlink_dump_start(nlsk, skb, nlh, &c);
332 }
333
334 afi = nf_tables_afinfo_lookup(net, family, false);
335 if (IS_ERR(afi))
336 return PTR_ERR(afi);
337
338 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
339 if (IS_ERR(table))
340 return PTR_ERR(table);
341 if (table->flags & NFT_TABLE_INACTIVE)
342 return -ENOENT;
343
344 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
345 if (!skb2)
346 return -ENOMEM;
347
348 err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid,
349 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
350 family, table);
351 if (err < 0)
352 goto err;
353
354 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
355
356 err:
357 kfree_skb(skb2);
358 return err;
359 }
360
361 static int nf_tables_table_enable(const struct nft_af_info *afi,
362 struct nft_table *table)
363 {
364 struct nft_chain *chain;
365 int err, i = 0;
366
367 list_for_each_entry(chain, &table->chains, list) {
368 if (!(chain->flags & NFT_BASE_CHAIN))
369 continue;
370
371 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
372 if (err < 0)
373 goto err;
374
375 i++;
376 }
377 return 0;
378 err:
379 list_for_each_entry(chain, &table->chains, list) {
380 if (!(chain->flags & NFT_BASE_CHAIN))
381 continue;
382
383 if (i-- <= 0)
384 break;
385
386 nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
387 }
388 return err;
389 }
390
391 static void nf_tables_table_disable(const struct nft_af_info *afi,
392 struct nft_table *table)
393 {
394 struct nft_chain *chain;
395
396 list_for_each_entry(chain, &table->chains, list) {
397 if (chain->flags & NFT_BASE_CHAIN)
398 nf_unregister_hooks(nft_base_chain(chain)->ops,
399 afi->nops);
400 }
401 }
402
403 static int nf_tables_updtable(struct nft_ctx *ctx)
404 {
405 struct nft_trans *trans;
406 u32 flags;
407 int ret = 0;
408
409 if (!ctx->nla[NFTA_TABLE_FLAGS])
410 return 0;
411
412 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
413 if (flags & ~NFT_TABLE_F_DORMANT)
414 return -EINVAL;
415
416 if (flags == ctx->table->flags)
417 return 0;
418
419 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
420 sizeof(struct nft_trans_table));
421 if (trans == NULL)
422 return -ENOMEM;
423
424 if ((flags & NFT_TABLE_F_DORMANT) &&
425 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
426 nft_trans_table_enable(trans) = false;
427 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
428 ctx->table->flags & NFT_TABLE_F_DORMANT) {
429 ret = nf_tables_table_enable(ctx->afi, ctx->table);
430 if (ret >= 0) {
431 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
432 nft_trans_table_enable(trans) = true;
433 }
434 }
435 if (ret < 0)
436 goto err;
437
438 nft_trans_table_update(trans) = true;
439 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
440 return 0;
441 err:
442 nft_trans_destroy(trans);
443 return ret;
444 }
445
446 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
447 {
448 struct nft_trans *trans;
449
450 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
451 if (trans == NULL)
452 return -ENOMEM;
453
454 if (msg_type == NFT_MSG_NEWTABLE)
455 ctx->table->flags |= NFT_TABLE_INACTIVE;
456
457 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
458 return 0;
459 }
460
461 static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
462 const struct nlmsghdr *nlh,
463 const struct nlattr * const nla[])
464 {
465 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
466 const struct nlattr *name;
467 struct nft_af_info *afi;
468 struct nft_table *table;
469 struct net *net = sock_net(skb->sk);
470 int family = nfmsg->nfgen_family;
471 u32 flags = 0;
472 struct nft_ctx ctx;
473 int err;
474
475 afi = nf_tables_afinfo_lookup(net, family, true);
476 if (IS_ERR(afi))
477 return PTR_ERR(afi);
478
479 name = nla[NFTA_TABLE_NAME];
480 table = nf_tables_table_lookup(afi, name);
481 if (IS_ERR(table)) {
482 if (PTR_ERR(table) != -ENOENT)
483 return PTR_ERR(table);
484 table = NULL;
485 }
486
487 if (table != NULL) {
488 if (table->flags & NFT_TABLE_INACTIVE)
489 return -ENOENT;
490 if (nlh->nlmsg_flags & NLM_F_EXCL)
491 return -EEXIST;
492 if (nlh->nlmsg_flags & NLM_F_REPLACE)
493 return -EOPNOTSUPP;
494
495 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
496 return nf_tables_updtable(&ctx);
497 }
498
499 if (nla[NFTA_TABLE_FLAGS]) {
500 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
501 if (flags & ~NFT_TABLE_F_DORMANT)
502 return -EINVAL;
503 }
504
505 if (!try_module_get(afi->owner))
506 return -EAFNOSUPPORT;
507
508 table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
509 if (table == NULL) {
510 module_put(afi->owner);
511 return -ENOMEM;
512 }
513
514 nla_strlcpy(table->name, name, nla_len(name));
515 INIT_LIST_HEAD(&table->chains);
516 INIT_LIST_HEAD(&table->sets);
517 table->flags = flags;
518
519 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
520 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
521 if (err < 0) {
522 kfree(table);
523 module_put(afi->owner);
524 return err;
525 }
526 list_add_tail_rcu(&table->list, &afi->tables);
527 return 0;
528 }
529
530 static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb,
531 const struct nlmsghdr *nlh,
532 const struct nlattr * const nla[])
533 {
534 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
535 struct nft_af_info *afi;
536 struct nft_table *table;
537 struct net *net = sock_net(skb->sk);
538 int family = nfmsg->nfgen_family, err;
539 struct nft_ctx ctx;
540
541 afi = nf_tables_afinfo_lookup(net, family, false);
542 if (IS_ERR(afi))
543 return PTR_ERR(afi);
544
545 table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]);
546 if (IS_ERR(table))
547 return PTR_ERR(table);
548 if (table->flags & NFT_TABLE_INACTIVE)
549 return -ENOENT;
550 if (table->use > 0)
551 return -EBUSY;
552
553 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
554 err = nft_trans_table_add(&ctx, NFT_MSG_DELTABLE);
555 if (err < 0)
556 return err;
557
558 list_del_rcu(&table->list);
559 return 0;
560 }
561
562 static void nf_tables_table_destroy(struct nft_ctx *ctx)
563 {
564 BUG_ON(ctx->table->use > 0);
565
566 kfree(ctx->table);
567 module_put(ctx->afi->owner);
568 }
569
570 int nft_register_chain_type(const struct nf_chain_type *ctype)
571 {
572 int err = 0;
573
574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
575 if (chain_type[ctype->family][ctype->type] != NULL) {
576 err = -EBUSY;
577 goto out;
578 }
579 chain_type[ctype->family][ctype->type] = ctype;
580 out:
581 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
582 return err;
583 }
584 EXPORT_SYMBOL_GPL(nft_register_chain_type);
585
586 void nft_unregister_chain_type(const struct nf_chain_type *ctype)
587 {
588 nfnl_lock(NFNL_SUBSYS_NFTABLES);
589 chain_type[ctype->family][ctype->type] = NULL;
590 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
591 }
592 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
593
594 /*
595 * Chains
596 */
597
598 static struct nft_chain *
599 nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle)
600 {
601 struct nft_chain *chain;
602
603 list_for_each_entry(chain, &table->chains, list) {
604 if (chain->handle == handle)
605 return chain;
606 }
607
608 return ERR_PTR(-ENOENT);
609 }
610
611 static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table,
612 const struct nlattr *nla)
613 {
614 struct nft_chain *chain;
615
616 if (nla == NULL)
617 return ERR_PTR(-EINVAL);
618
619 list_for_each_entry(chain, &table->chains, list) {
620 if (!nla_strcmp(nla, chain->name))
621 return chain;
622 }
623
624 return ERR_PTR(-ENOENT);
625 }
626
627 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
628 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING },
629 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
630 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
631 .len = NFT_CHAIN_MAXNAMELEN - 1 },
632 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
633 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
634 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
635 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
636 };
637
638 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
639 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
640 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
641 };
642
643 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
644 {
645 struct nft_stats *cpu_stats, total;
646 struct nlattr *nest;
647 unsigned int seq;
648 u64 pkts, bytes;
649 int cpu;
650
651 memset(&total, 0, sizeof(total));
652 for_each_possible_cpu(cpu) {
653 cpu_stats = per_cpu_ptr(stats, cpu);
654 do {
655 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
656 pkts = cpu_stats->pkts;
657 bytes = cpu_stats->bytes;
658 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
659 total.pkts += pkts;
660 total.bytes += bytes;
661 }
662 nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
663 if (nest == NULL)
664 goto nla_put_failure;
665
666 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
667 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
668 goto nla_put_failure;
669
670 nla_nest_end(skb, nest);
671 return 0;
672
673 nla_put_failure:
674 return -ENOSPC;
675 }
676
677 static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
678 int event, u32 flags, int family,
679 const struct nft_table *table,
680 const struct nft_chain *chain)
681 {
682 struct nlmsghdr *nlh;
683 struct nfgenmsg *nfmsg;
684
685 event |= NFNL_SUBSYS_NFTABLES << 8;
686 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
687 if (nlh == NULL)
688 goto nla_put_failure;
689
690 nfmsg = nlmsg_data(nlh);
691 nfmsg->nfgen_family = family;
692 nfmsg->version = NFNETLINK_V0;
693 nfmsg->res_id = 0;
694
695 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
696 goto nla_put_failure;
697 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle)))
698 goto nla_put_failure;
699 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
700 goto nla_put_failure;
701
702 if (chain->flags & NFT_BASE_CHAIN) {
703 const struct nft_base_chain *basechain = nft_base_chain(chain);
704 const struct nf_hook_ops *ops = &basechain->ops[0];
705 struct nlattr *nest;
706
707 nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
708 if (nest == NULL)
709 goto nla_put_failure;
710 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
711 goto nla_put_failure;
712 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
713 goto nla_put_failure;
714 nla_nest_end(skb, nest);
715
716 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
717 htonl(basechain->policy)))
718 goto nla_put_failure;
719
720 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
721 goto nla_put_failure;
722
723 if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
724 goto nla_put_failure;
725 }
726
727 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
728 goto nla_put_failure;
729
730 return nlmsg_end(skb, nlh);
731
732 nla_put_failure:
733 nlmsg_trim(skb, nlh);
734 return -1;
735 }
736
737 static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
738 {
739 struct sk_buff *skb;
740 int err;
741
742 if (!ctx->report &&
743 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
744 return 0;
745
746 err = -ENOBUFS;
747 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
748 if (skb == NULL)
749 goto err;
750
751 err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0,
752 ctx->afi->family, ctx->table,
753 ctx->chain);
754 if (err < 0) {
755 kfree_skb(skb);
756 goto err;
757 }
758
759 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
760 ctx->report, GFP_KERNEL);
761 err:
762 if (err < 0) {
763 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
764 err);
765 }
766 return err;
767 }
768
769 static int nf_tables_dump_chains(struct sk_buff *skb,
770 struct netlink_callback *cb)
771 {
772 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
773 const struct nft_af_info *afi;
774 const struct nft_table *table;
775 const struct nft_chain *chain;
776 unsigned int idx = 0, s_idx = cb->args[0];
777 struct net *net = sock_net(skb->sk);
778 int family = nfmsg->nfgen_family;
779
780 rcu_read_lock();
781 cb->seq = net->nft.base_seq;
782
783 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
784 if (family != NFPROTO_UNSPEC && family != afi->family)
785 continue;
786
787 list_for_each_entry_rcu(table, &afi->tables, list) {
788 list_for_each_entry_rcu(chain, &table->chains, list) {
789 if (idx < s_idx)
790 goto cont;
791 if (idx > s_idx)
792 memset(&cb->args[1], 0,
793 sizeof(cb->args) - sizeof(cb->args[0]));
794 if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid,
795 cb->nlh->nlmsg_seq,
796 NFT_MSG_NEWCHAIN,
797 NLM_F_MULTI,
798 afi->family, table, chain) < 0)
799 goto done;
800
801 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
802 cont:
803 idx++;
804 }
805 }
806 }
807 done:
808 rcu_read_unlock();
809 cb->args[0] = idx;
810 return skb->len;
811 }
812
813 static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb,
814 const struct nlmsghdr *nlh,
815 const struct nlattr * const nla[])
816 {
817 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
818 const struct nft_af_info *afi;
819 const struct nft_table *table;
820 const struct nft_chain *chain;
821 struct sk_buff *skb2;
822 struct net *net = sock_net(skb->sk);
823 int family = nfmsg->nfgen_family;
824 int err;
825
826 if (nlh->nlmsg_flags & NLM_F_DUMP) {
827 struct netlink_dump_control c = {
828 .dump = nf_tables_dump_chains,
829 };
830 return netlink_dump_start(nlsk, skb, nlh, &c);
831 }
832
833 afi = nf_tables_afinfo_lookup(net, family, false);
834 if (IS_ERR(afi))
835 return PTR_ERR(afi);
836
837 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
838 if (IS_ERR(table))
839 return PTR_ERR(table);
840 if (table->flags & NFT_TABLE_INACTIVE)
841 return -ENOENT;
842
843 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
844 if (IS_ERR(chain))
845 return PTR_ERR(chain);
846 if (chain->flags & NFT_CHAIN_INACTIVE)
847 return -ENOENT;
848
849 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
850 if (!skb2)
851 return -ENOMEM;
852
853 err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid,
854 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
855 family, table, chain);
856 if (err < 0)
857 goto err;
858
859 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
860
861 err:
862 kfree_skb(skb2);
863 return err;
864 }
865
866 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
867 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
868 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
869 };
870
871 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
872 {
873 struct nlattr *tb[NFTA_COUNTER_MAX+1];
874 struct nft_stats __percpu *newstats;
875 struct nft_stats *stats;
876 int err;
877
878 err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
879 if (err < 0)
880 return ERR_PTR(err);
881
882 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
883 return ERR_PTR(-EINVAL);
884
885 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
886 if (newstats == NULL)
887 return ERR_PTR(-ENOMEM);
888
889 /* Restore old counters on this cpu, no problem. Per-cpu statistics
890 * are not exposed to userspace.
891 */
892 stats = this_cpu_ptr(newstats);
893 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
894 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
895
896 return newstats;
897 }
898
899 static void nft_chain_stats_replace(struct nft_base_chain *chain,
900 struct nft_stats __percpu *newstats)
901 {
902 if (chain->stats) {
903 struct nft_stats __percpu *oldstats =
904 nft_dereference(chain->stats);
905
906 rcu_assign_pointer(chain->stats, newstats);
907 synchronize_rcu();
908 free_percpu(oldstats);
909 } else
910 rcu_assign_pointer(chain->stats, newstats);
911 }
912
913 static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
914 {
915 struct nft_trans *trans;
916
917 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
918 if (trans == NULL)
919 return -ENOMEM;
920
921 if (msg_type == NFT_MSG_NEWCHAIN)
922 ctx->chain->flags |= NFT_CHAIN_INACTIVE;
923
924 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
925 return 0;
926 }
927
928 static void nf_tables_chain_destroy(struct nft_chain *chain)
929 {
930 BUG_ON(chain->use > 0);
931
932 if (chain->flags & NFT_BASE_CHAIN) {
933 module_put(nft_base_chain(chain)->type->owner);
934 free_percpu(nft_base_chain(chain)->stats);
935 kfree(nft_base_chain(chain));
936 } else {
937 kfree(chain);
938 }
939 }
940
941 static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
942 const struct nlmsghdr *nlh,
943 const struct nlattr * const nla[])
944 {
945 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
946 const struct nlattr * uninitialized_var(name);
947 struct nft_af_info *afi;
948 struct nft_table *table;
949 struct nft_chain *chain;
950 struct nft_base_chain *basechain = NULL;
951 struct nlattr *ha[NFTA_HOOK_MAX + 1];
952 struct net *net = sock_net(skb->sk);
953 int family = nfmsg->nfgen_family;
954 u8 policy = NF_ACCEPT;
955 u64 handle = 0;
956 unsigned int i;
957 struct nft_stats __percpu *stats;
958 int err;
959 bool create;
960 struct nft_ctx ctx;
961
962 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
963
964 afi = nf_tables_afinfo_lookup(net, family, true);
965 if (IS_ERR(afi))
966 return PTR_ERR(afi);
967
968 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
969 if (IS_ERR(table))
970 return PTR_ERR(table);
971
972 chain = NULL;
973 name = nla[NFTA_CHAIN_NAME];
974
975 if (nla[NFTA_CHAIN_HANDLE]) {
976 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
977 chain = nf_tables_chain_lookup_byhandle(table, handle);
978 if (IS_ERR(chain))
979 return PTR_ERR(chain);
980 } else {
981 chain = nf_tables_chain_lookup(table, name);
982 if (IS_ERR(chain)) {
983 if (PTR_ERR(chain) != -ENOENT)
984 return PTR_ERR(chain);
985 chain = NULL;
986 }
987 }
988
989 if (nla[NFTA_CHAIN_POLICY]) {
990 if ((chain != NULL &&
991 !(chain->flags & NFT_BASE_CHAIN)) ||
992 nla[NFTA_CHAIN_HOOK] == NULL)
993 return -EOPNOTSUPP;
994
995 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
996 switch (policy) {
997 case NF_DROP:
998 case NF_ACCEPT:
999 break;
1000 default:
1001 return -EINVAL;
1002 }
1003 }
1004
1005 if (chain != NULL) {
1006 struct nft_stats *stats = NULL;
1007 struct nft_trans *trans;
1008
1009 if (chain->flags & NFT_CHAIN_INACTIVE)
1010 return -ENOENT;
1011 if (nlh->nlmsg_flags & NLM_F_EXCL)
1012 return -EEXIST;
1013 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1014 return -EOPNOTSUPP;
1015
1016 if (nla[NFTA_CHAIN_HANDLE] && name &&
1017 !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
1018 return -EEXIST;
1019
1020 if (nla[NFTA_CHAIN_COUNTERS]) {
1021 if (!(chain->flags & NFT_BASE_CHAIN))
1022 return -EOPNOTSUPP;
1023
1024 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1025 if (IS_ERR(stats))
1026 return PTR_ERR(stats);
1027 }
1028
1029 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1030 trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
1031 sizeof(struct nft_trans_chain));
1032 if (trans == NULL)
1033 return -ENOMEM;
1034
1035 nft_trans_chain_stats(trans) = stats;
1036 nft_trans_chain_update(trans) = true;
1037
1038 if (nla[NFTA_CHAIN_POLICY])
1039 nft_trans_chain_policy(trans) = policy;
1040 else
1041 nft_trans_chain_policy(trans) = -1;
1042
1043 if (nla[NFTA_CHAIN_HANDLE] && name) {
1044 nla_strlcpy(nft_trans_chain_name(trans), name,
1045 NFT_CHAIN_MAXNAMELEN);
1046 }
1047 list_add_tail(&trans->list, &net->nft.commit_list);
1048 return 0;
1049 }
1050
1051 if (table->use == UINT_MAX)
1052 return -EOVERFLOW;
1053
1054 if (nla[NFTA_CHAIN_HOOK]) {
1055 const struct nf_chain_type *type;
1056 struct nf_hook_ops *ops;
1057 nf_hookfn *hookfn;
1058 u32 hooknum, priority;
1059
1060 type = chain_type[family][NFT_CHAIN_T_DEFAULT];
1061 if (nla[NFTA_CHAIN_TYPE]) {
1062 type = nf_tables_chain_type_lookup(afi,
1063 nla[NFTA_CHAIN_TYPE],
1064 create);
1065 if (IS_ERR(type))
1066 return PTR_ERR(type);
1067 }
1068
1069 err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK],
1070 nft_hook_policy);
1071 if (err < 0)
1072 return err;
1073 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1074 ha[NFTA_HOOK_PRIORITY] == NULL)
1075 return -EINVAL;
1076
1077 hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1078 if (hooknum >= afi->nhooks)
1079 return -EINVAL;
1080 priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1081
1082 if (!(type->hook_mask & (1 << hooknum)))
1083 return -EOPNOTSUPP;
1084 if (!try_module_get(type->owner))
1085 return -ENOENT;
1086 hookfn = type->hooks[hooknum];
1087
1088 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1089 if (basechain == NULL)
1090 return -ENOMEM;
1091
1092 if (nla[NFTA_CHAIN_COUNTERS]) {
1093 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1094 if (IS_ERR(stats)) {
1095 module_put(type->owner);
1096 kfree(basechain);
1097 return PTR_ERR(stats);
1098 }
1099 basechain->stats = stats;
1100 } else {
1101 stats = netdev_alloc_pcpu_stats(struct nft_stats);
1102 if (IS_ERR(stats)) {
1103 module_put(type->owner);
1104 kfree(basechain);
1105 return PTR_ERR(stats);
1106 }
1107 rcu_assign_pointer(basechain->stats, stats);
1108 }
1109
1110 basechain->type = type;
1111 chain = &basechain->chain;
1112
1113 for (i = 0; i < afi->nops; i++) {
1114 ops = &basechain->ops[i];
1115 ops->pf = family;
1116 ops->owner = afi->owner;
1117 ops->hooknum = hooknum;
1118 ops->priority = priority;
1119 ops->priv = chain;
1120 ops->hook = afi->hooks[ops->hooknum];
1121 if (hookfn)
1122 ops->hook = hookfn;
1123 if (afi->hook_ops_init)
1124 afi->hook_ops_init(ops, i);
1125 }
1126
1127 chain->flags |= NFT_BASE_CHAIN;
1128 basechain->policy = policy;
1129 } else {
1130 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
1131 if (chain == NULL)
1132 return -ENOMEM;
1133 }
1134
1135 INIT_LIST_HEAD(&chain->rules);
1136 chain->handle = nf_tables_alloc_handle(table);
1137 chain->net = net;
1138 chain->table = table;
1139 nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
1140
1141 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1142 chain->flags & NFT_BASE_CHAIN) {
1143 err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
1144 if (err < 0)
1145 goto err1;
1146 }
1147
1148 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1149 err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN);
1150 if (err < 0)
1151 goto err2;
1152
1153 table->use++;
1154 list_add_tail_rcu(&chain->list, &table->chains);
1155 return 0;
1156 err2:
1157 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
1158 chain->flags & NFT_BASE_CHAIN) {
1159 nf_unregister_hooks(nft_base_chain(chain)->ops,
1160 afi->nops);
1161 }
1162 err1:
1163 nf_tables_chain_destroy(chain);
1164 return err;
1165 }
1166
1167 static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
1168 const struct nlmsghdr *nlh,
1169 const struct nlattr * const nla[])
1170 {
1171 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1172 struct nft_af_info *afi;
1173 struct nft_table *table;
1174 struct nft_chain *chain;
1175 struct net *net = sock_net(skb->sk);
1176 int family = nfmsg->nfgen_family;
1177 struct nft_ctx ctx;
1178 int err;
1179
1180 afi = nf_tables_afinfo_lookup(net, family, false);
1181 if (IS_ERR(afi))
1182 return PTR_ERR(afi);
1183
1184 table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]);
1185 if (IS_ERR(table))
1186 return PTR_ERR(table);
1187 if (table->flags & NFT_TABLE_INACTIVE)
1188 return -ENOENT;
1189
1190 chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]);
1191 if (IS_ERR(chain))
1192 return PTR_ERR(chain);
1193 if (chain->flags & NFT_CHAIN_INACTIVE)
1194 return -ENOENT;
1195 if (chain->use > 0)
1196 return -EBUSY;
1197
1198 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1199 err = nft_trans_chain_add(&ctx, NFT_MSG_DELCHAIN);
1200 if (err < 0)
1201 return err;
1202
1203 table->use--;
1204 list_del_rcu(&chain->list);
1205 return 0;
1206 }
1207
1208 /*
1209 * Expressions
1210 */
1211
1212 /**
1213 * nft_register_expr - register nf_tables expr type
1214 * @ops: expr type
1215 *
1216 * Registers the expr type for use with nf_tables. Returns zero on
1217 * success or a negative errno code otherwise.
1218 */
1219 int nft_register_expr(struct nft_expr_type *type)
1220 {
1221 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1222 if (type->family == NFPROTO_UNSPEC)
1223 list_add_tail_rcu(&type->list, &nf_tables_expressions);
1224 else
1225 list_add_rcu(&type->list, &nf_tables_expressions);
1226 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1227 return 0;
1228 }
1229 EXPORT_SYMBOL_GPL(nft_register_expr);
1230
1231 /**
1232 * nft_unregister_expr - unregister nf_tables expr type
1233 * @ops: expr type
1234 *
1235 * Unregisters the expr typefor use with nf_tables.
1236 */
1237 void nft_unregister_expr(struct nft_expr_type *type)
1238 {
1239 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1240 list_del_rcu(&type->list);
1241 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1242 }
1243 EXPORT_SYMBOL_GPL(nft_unregister_expr);
1244
1245 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
1246 struct nlattr *nla)
1247 {
1248 const struct nft_expr_type *type;
1249
1250 list_for_each_entry(type, &nf_tables_expressions, list) {
1251 if (!nla_strcmp(nla, type->name) &&
1252 (!type->family || type->family == family))
1253 return type;
1254 }
1255 return NULL;
1256 }
1257
1258 static const struct nft_expr_type *nft_expr_type_get(u8 family,
1259 struct nlattr *nla)
1260 {
1261 const struct nft_expr_type *type;
1262
1263 if (nla == NULL)
1264 return ERR_PTR(-EINVAL);
1265
1266 type = __nft_expr_type_get(family, nla);
1267 if (type != NULL && try_module_get(type->owner))
1268 return type;
1269
1270 #ifdef CONFIG_MODULES
1271 if (type == NULL) {
1272 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1273 request_module("nft-expr-%u-%.*s", family,
1274 nla_len(nla), (char *)nla_data(nla));
1275 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1276 if (__nft_expr_type_get(family, nla))
1277 return ERR_PTR(-EAGAIN);
1278
1279 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1280 request_module("nft-expr-%.*s",
1281 nla_len(nla), (char *)nla_data(nla));
1282 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1283 if (__nft_expr_type_get(family, nla))
1284 return ERR_PTR(-EAGAIN);
1285 }
1286 #endif
1287 return ERR_PTR(-ENOENT);
1288 }
1289
1290 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
1291 [NFTA_EXPR_NAME] = { .type = NLA_STRING },
1292 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
1293 };
1294
1295 static int nf_tables_fill_expr_info(struct sk_buff *skb,
1296 const struct nft_expr *expr)
1297 {
1298 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
1299 goto nla_put_failure;
1300
1301 if (expr->ops->dump) {
1302 struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA);
1303 if (data == NULL)
1304 goto nla_put_failure;
1305 if (expr->ops->dump(skb, expr) < 0)
1306 goto nla_put_failure;
1307 nla_nest_end(skb, data);
1308 }
1309
1310 return skb->len;
1311
1312 nla_put_failure:
1313 return -1;
1314 };
1315
1316 struct nft_expr_info {
1317 const struct nft_expr_ops *ops;
1318 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
1319 };
1320
1321 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
1322 const struct nlattr *nla,
1323 struct nft_expr_info *info)
1324 {
1325 const struct nft_expr_type *type;
1326 const struct nft_expr_ops *ops;
1327 struct nlattr *tb[NFTA_EXPR_MAX + 1];
1328 int err;
1329
1330 err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy);
1331 if (err < 0)
1332 return err;
1333
1334 type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]);
1335 if (IS_ERR(type))
1336 return PTR_ERR(type);
1337
1338 if (tb[NFTA_EXPR_DATA]) {
1339 err = nla_parse_nested(info->tb, type->maxattr,
1340 tb[NFTA_EXPR_DATA], type->policy);
1341 if (err < 0)
1342 goto err1;
1343 } else
1344 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
1345
1346 if (type->select_ops != NULL) {
1347 ops = type->select_ops(ctx,
1348 (const struct nlattr * const *)info->tb);
1349 if (IS_ERR(ops)) {
1350 err = PTR_ERR(ops);
1351 goto err1;
1352 }
1353 } else
1354 ops = type->ops;
1355
1356 info->ops = ops;
1357 return 0;
1358
1359 err1:
1360 module_put(type->owner);
1361 return err;
1362 }
1363
1364 static int nf_tables_newexpr(const struct nft_ctx *ctx,
1365 const struct nft_expr_info *info,
1366 struct nft_expr *expr)
1367 {
1368 const struct nft_expr_ops *ops = info->ops;
1369 int err;
1370
1371 expr->ops = ops;
1372 if (ops->init) {
1373 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
1374 if (err < 0)
1375 goto err1;
1376 }
1377
1378 return 0;
1379
1380 err1:
1381 expr->ops = NULL;
1382 return err;
1383 }
1384
1385 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
1386 struct nft_expr *expr)
1387 {
1388 if (expr->ops->destroy)
1389 expr->ops->destroy(ctx, expr);
1390 module_put(expr->ops->type->owner);
1391 }
1392
1393 /*
1394 * Rules
1395 */
1396
1397 static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain,
1398 u64 handle)
1399 {
1400 struct nft_rule *rule;
1401
1402 // FIXME: this sucks
1403 list_for_each_entry(rule, &chain->rules, list) {
1404 if (handle == rule->handle)
1405 return rule;
1406 }
1407
1408 return ERR_PTR(-ENOENT);
1409 }
1410
1411 static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain,
1412 const struct nlattr *nla)
1413 {
1414 if (nla == NULL)
1415 return ERR_PTR(-EINVAL);
1416
1417 return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
1418 }
1419
1420 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
1421 [NFTA_RULE_TABLE] = { .type = NLA_STRING },
1422 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
1423 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1424 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
1425 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
1426 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
1427 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
1428 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
1429 .len = NFT_USERDATA_MAXLEN },
1430 };
1431
1432 static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
1433 int event, u32 flags, int family,
1434 const struct nft_table *table,
1435 const struct nft_chain *chain,
1436 const struct nft_rule *rule)
1437 {
1438 struct nlmsghdr *nlh;
1439 struct nfgenmsg *nfmsg;
1440 const struct nft_expr *expr, *next;
1441 struct nlattr *list;
1442 const struct nft_rule *prule;
1443 int type = event | NFNL_SUBSYS_NFTABLES << 8;
1444
1445 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg),
1446 flags);
1447 if (nlh == NULL)
1448 goto nla_put_failure;
1449
1450 nfmsg = nlmsg_data(nlh);
1451 nfmsg->nfgen_family = family;
1452 nfmsg->version = NFNETLINK_V0;
1453 nfmsg->res_id = 0;
1454
1455 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
1456 goto nla_put_failure;
1457 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
1458 goto nla_put_failure;
1459 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle)))
1460 goto nla_put_failure;
1461
1462 if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) {
1463 prule = list_entry(rule->list.prev, struct nft_rule, list);
1464 if (nla_put_be64(skb, NFTA_RULE_POSITION,
1465 cpu_to_be64(prule->handle)))
1466 goto nla_put_failure;
1467 }
1468
1469 list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS);
1470 if (list == NULL)
1471 goto nla_put_failure;
1472 nft_rule_for_each_expr(expr, next, rule) {
1473 struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM);
1474 if (elem == NULL)
1475 goto nla_put_failure;
1476 if (nf_tables_fill_expr_info(skb, expr) < 0)
1477 goto nla_put_failure;
1478 nla_nest_end(skb, elem);
1479 }
1480 nla_nest_end(skb, list);
1481
1482 if (rule->ulen &&
1483 nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
1484 goto nla_put_failure;
1485
1486 return nlmsg_end(skb, nlh);
1487
1488 nla_put_failure:
1489 nlmsg_trim(skb, nlh);
1490 return -1;
1491 }
1492
1493 static int nf_tables_rule_notify(const struct nft_ctx *ctx,
1494 const struct nft_rule *rule,
1495 int event)
1496 {
1497 struct sk_buff *skb;
1498 int err;
1499
1500 if (!ctx->report &&
1501 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1502 return 0;
1503
1504 err = -ENOBUFS;
1505 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1506 if (skb == NULL)
1507 goto err;
1508
1509 err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0,
1510 ctx->afi->family, ctx->table,
1511 ctx->chain, rule);
1512 if (err < 0) {
1513 kfree_skb(skb);
1514 goto err;
1515 }
1516
1517 err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1518 ctx->report, GFP_KERNEL);
1519 err:
1520 if (err < 0) {
1521 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1522 err);
1523 }
1524 return err;
1525 }
1526
1527 static inline bool
1528 nft_rule_is_active(struct net *net, const struct nft_rule *rule)
1529 {
1530 return (rule->genmask & (1 << net->nft.gencursor)) == 0;
1531 }
1532
1533 static inline int gencursor_next(struct net *net)
1534 {
1535 return net->nft.gencursor+1 == 1 ? 1 : 0;
1536 }
1537
1538 static inline int
1539 nft_rule_is_active_next(struct net *net, const struct nft_rule *rule)
1540 {
1541 return (rule->genmask & (1 << gencursor_next(net))) == 0;
1542 }
1543
1544 static inline void
1545 nft_rule_activate_next(struct net *net, struct nft_rule *rule)
1546 {
1547 /* Now inactive, will be active in the future */
1548 rule->genmask = (1 << net->nft.gencursor);
1549 }
1550
1551 static inline void
1552 nft_rule_disactivate_next(struct net *net, struct nft_rule *rule)
1553 {
1554 rule->genmask = (1 << gencursor_next(net));
1555 }
1556
1557 static inline void nft_rule_clear(struct net *net, struct nft_rule *rule)
1558 {
1559 rule->genmask = 0;
1560 }
1561
1562 static int nf_tables_dump_rules(struct sk_buff *skb,
1563 struct netlink_callback *cb)
1564 {
1565 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1566 const struct nft_af_info *afi;
1567 const struct nft_table *table;
1568 const struct nft_chain *chain;
1569 const struct nft_rule *rule;
1570 unsigned int idx = 0, s_idx = cb->args[0];
1571 struct net *net = sock_net(skb->sk);
1572 int family = nfmsg->nfgen_family;
1573
1574 rcu_read_lock();
1575 cb->seq = net->nft.base_seq;
1576
1577 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
1578 if (family != NFPROTO_UNSPEC && family != afi->family)
1579 continue;
1580
1581 list_for_each_entry_rcu(table, &afi->tables, list) {
1582 list_for_each_entry_rcu(chain, &table->chains, list) {
1583 list_for_each_entry_rcu(rule, &chain->rules, list) {
1584 if (!nft_rule_is_active(net, rule))
1585 goto cont;
1586 if (idx < s_idx)
1587 goto cont;
1588 if (idx > s_idx)
1589 memset(&cb->args[1], 0,
1590 sizeof(cb->args) - sizeof(cb->args[0]));
1591 if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid,
1592 cb->nlh->nlmsg_seq,
1593 NFT_MSG_NEWRULE,
1594 NLM_F_MULTI | NLM_F_APPEND,
1595 afi->family, table, chain, rule) < 0)
1596 goto done;
1597
1598 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1599 cont:
1600 idx++;
1601 }
1602 }
1603 }
1604 }
1605 done:
1606 rcu_read_unlock();
1607
1608 cb->args[0] = idx;
1609 return skb->len;
1610 }
1611
1612 static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb,
1613 const struct nlmsghdr *nlh,
1614 const struct nlattr * const nla[])
1615 {
1616 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1617 const struct nft_af_info *afi;
1618 const struct nft_table *table;
1619 const struct nft_chain *chain;
1620 const struct nft_rule *rule;
1621 struct sk_buff *skb2;
1622 struct net *net = sock_net(skb->sk);
1623 int family = nfmsg->nfgen_family;
1624 int err;
1625
1626 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1627 struct netlink_dump_control c = {
1628 .dump = nf_tables_dump_rules,
1629 };
1630 return netlink_dump_start(nlsk, skb, nlh, &c);
1631 }
1632
1633 afi = nf_tables_afinfo_lookup(net, family, false);
1634 if (IS_ERR(afi))
1635 return PTR_ERR(afi);
1636
1637 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1638 if (IS_ERR(table))
1639 return PTR_ERR(table);
1640 if (table->flags & NFT_TABLE_INACTIVE)
1641 return -ENOENT;
1642
1643 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1644 if (IS_ERR(chain))
1645 return PTR_ERR(chain);
1646 if (chain->flags & NFT_CHAIN_INACTIVE)
1647 return -ENOENT;
1648
1649 rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
1650 if (IS_ERR(rule))
1651 return PTR_ERR(rule);
1652
1653 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1654 if (!skb2)
1655 return -ENOMEM;
1656
1657 err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid,
1658 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
1659 family, table, chain, rule);
1660 if (err < 0)
1661 goto err;
1662
1663 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
1664
1665 err:
1666 kfree_skb(skb2);
1667 return err;
1668 }
1669
1670 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
1671 struct nft_rule *rule)
1672 {
1673 struct nft_expr *expr;
1674
1675 /*
1676 * Careful: some expressions might not be initialized in case this
1677 * is called on error from nf_tables_newrule().
1678 */
1679 expr = nft_expr_first(rule);
1680 while (expr->ops && expr != nft_expr_last(rule)) {
1681 nf_tables_expr_destroy(ctx, expr);
1682 expr = nft_expr_next(expr);
1683 }
1684 kfree(rule);
1685 }
1686
1687 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
1688 struct nft_rule *rule)
1689 {
1690 struct nft_trans *trans;
1691
1692 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
1693 if (trans == NULL)
1694 return NULL;
1695
1696 nft_trans_rule(trans) = rule;
1697 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
1698
1699 return trans;
1700 }
1701
1702 #define NFT_RULE_MAXEXPRS 128
1703
1704 static struct nft_expr_info *info;
1705
1706 static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
1707 const struct nlmsghdr *nlh,
1708 const struct nlattr * const nla[])
1709 {
1710 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1711 struct nft_af_info *afi;
1712 struct net *net = sock_net(skb->sk);
1713 struct nft_table *table;
1714 struct nft_chain *chain;
1715 struct nft_rule *rule, *old_rule = NULL;
1716 struct nft_trans *trans = NULL;
1717 struct nft_expr *expr;
1718 struct nft_ctx ctx;
1719 struct nlattr *tmp;
1720 unsigned int size, i, n, ulen = 0;
1721 int err, rem;
1722 bool create;
1723 u64 handle, pos_handle;
1724
1725 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
1726
1727 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
1728 if (IS_ERR(afi))
1729 return PTR_ERR(afi);
1730
1731 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1732 if (IS_ERR(table))
1733 return PTR_ERR(table);
1734
1735 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1736 if (IS_ERR(chain))
1737 return PTR_ERR(chain);
1738
1739 if (nla[NFTA_RULE_HANDLE]) {
1740 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
1741 rule = __nf_tables_rule_lookup(chain, handle);
1742 if (IS_ERR(rule))
1743 return PTR_ERR(rule);
1744
1745 if (nlh->nlmsg_flags & NLM_F_EXCL)
1746 return -EEXIST;
1747 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1748 old_rule = rule;
1749 else
1750 return -EOPNOTSUPP;
1751 } else {
1752 if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
1753 return -EINVAL;
1754 handle = nf_tables_alloc_handle(table);
1755
1756 if (chain->use == UINT_MAX)
1757 return -EOVERFLOW;
1758 }
1759
1760 if (nla[NFTA_RULE_POSITION]) {
1761 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1762 return -EOPNOTSUPP;
1763
1764 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
1765 old_rule = __nf_tables_rule_lookup(chain, pos_handle);
1766 if (IS_ERR(old_rule))
1767 return PTR_ERR(old_rule);
1768 }
1769
1770 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1771
1772 n = 0;
1773 size = 0;
1774 if (nla[NFTA_RULE_EXPRESSIONS]) {
1775 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
1776 err = -EINVAL;
1777 if (nla_type(tmp) != NFTA_LIST_ELEM)
1778 goto err1;
1779 if (n == NFT_RULE_MAXEXPRS)
1780 goto err1;
1781 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
1782 if (err < 0)
1783 goto err1;
1784 size += info[n].ops->size;
1785 n++;
1786 }
1787 }
1788
1789 if (nla[NFTA_RULE_USERDATA])
1790 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
1791
1792 err = -ENOMEM;
1793 rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
1794 if (rule == NULL)
1795 goto err1;
1796
1797 nft_rule_activate_next(net, rule);
1798
1799 rule->handle = handle;
1800 rule->dlen = size;
1801 rule->ulen = ulen;
1802
1803 if (ulen)
1804 nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
1805
1806 expr = nft_expr_first(rule);
1807 for (i = 0; i < n; i++) {
1808 err = nf_tables_newexpr(&ctx, &info[i], expr);
1809 if (err < 0)
1810 goto err2;
1811 info[i].ops = NULL;
1812 expr = nft_expr_next(expr);
1813 }
1814
1815 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
1816 if (nft_rule_is_active_next(net, old_rule)) {
1817 trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE,
1818 old_rule);
1819 if (trans == NULL) {
1820 err = -ENOMEM;
1821 goto err2;
1822 }
1823 nft_rule_disactivate_next(net, old_rule);
1824 chain->use--;
1825 list_add_tail_rcu(&rule->list, &old_rule->list);
1826 } else {
1827 err = -ENOENT;
1828 goto err2;
1829 }
1830 } else if (nlh->nlmsg_flags & NLM_F_APPEND)
1831 if (old_rule)
1832 list_add_rcu(&rule->list, &old_rule->list);
1833 else
1834 list_add_tail_rcu(&rule->list, &chain->rules);
1835 else {
1836 if (old_rule)
1837 list_add_tail_rcu(&rule->list, &old_rule->list);
1838 else
1839 list_add_rcu(&rule->list, &chain->rules);
1840 }
1841
1842 if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) {
1843 err = -ENOMEM;
1844 goto err3;
1845 }
1846 chain->use++;
1847 return 0;
1848
1849 err3:
1850 list_del_rcu(&rule->list);
1851 if (trans) {
1852 list_del_rcu(&nft_trans_rule(trans)->list);
1853 nft_rule_clear(net, nft_trans_rule(trans));
1854 nft_trans_destroy(trans);
1855 chain->use++;
1856 }
1857 err2:
1858 nf_tables_rule_destroy(&ctx, rule);
1859 err1:
1860 for (i = 0; i < n; i++) {
1861 if (info[i].ops != NULL)
1862 module_put(info[i].ops->type->owner);
1863 }
1864 return err;
1865 }
1866
1867 static int
1868 nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
1869 {
1870 /* You cannot delete the same rule twice */
1871 if (nft_rule_is_active_next(ctx->net, rule)) {
1872 if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL)
1873 return -ENOMEM;
1874 nft_rule_disactivate_next(ctx->net, rule);
1875 ctx->chain->use--;
1876 return 0;
1877 }
1878 return -ENOENT;
1879 }
1880
1881 static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
1882 {
1883 struct nft_rule *rule;
1884 int err;
1885
1886 list_for_each_entry(rule, &ctx->chain->rules, list) {
1887 err = nf_tables_delrule_one(ctx, rule);
1888 if (err < 0)
1889 return err;
1890 }
1891 return 0;
1892 }
1893
1894 static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
1895 const struct nlmsghdr *nlh,
1896 const struct nlattr * const nla[])
1897 {
1898 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1899 struct nft_af_info *afi;
1900 struct net *net = sock_net(skb->sk);
1901 struct nft_table *table;
1902 struct nft_chain *chain = NULL;
1903 struct nft_rule *rule;
1904 int family = nfmsg->nfgen_family, err = 0;
1905 struct nft_ctx ctx;
1906
1907 afi = nf_tables_afinfo_lookup(net, family, false);
1908 if (IS_ERR(afi))
1909 return PTR_ERR(afi);
1910
1911 table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]);
1912 if (IS_ERR(table))
1913 return PTR_ERR(table);
1914 if (table->flags & NFT_TABLE_INACTIVE)
1915 return -ENOENT;
1916
1917 if (nla[NFTA_RULE_CHAIN]) {
1918 chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
1919 if (IS_ERR(chain))
1920 return PTR_ERR(chain);
1921 }
1922
1923 nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
1924
1925 if (chain) {
1926 if (nla[NFTA_RULE_HANDLE]) {
1927 rule = nf_tables_rule_lookup(chain,
1928 nla[NFTA_RULE_HANDLE]);
1929 if (IS_ERR(rule))
1930 return PTR_ERR(rule);
1931
1932 err = nf_tables_delrule_one(&ctx, rule);
1933 } else {
1934 err = nf_table_delrule_by_chain(&ctx);
1935 }
1936 } else {
1937 list_for_each_entry(chain, &table->chains, list) {
1938 ctx.chain = chain;
1939 err = nf_table_delrule_by_chain(&ctx);
1940 if (err < 0)
1941 break;
1942 }
1943 }
1944
1945 return err;
1946 }
1947
1948 /*
1949 * Sets
1950 */
1951
1952 static LIST_HEAD(nf_tables_set_ops);
1953
1954 int nft_register_set(struct nft_set_ops *ops)
1955 {
1956 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1957 list_add_tail_rcu(&ops->list, &nf_tables_set_ops);
1958 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1959 return 0;
1960 }
1961 EXPORT_SYMBOL_GPL(nft_register_set);
1962
1963 void nft_unregister_set(struct nft_set_ops *ops)
1964 {
1965 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1966 list_del_rcu(&ops->list);
1967 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1968 }
1969 EXPORT_SYMBOL_GPL(nft_unregister_set);
1970
1971 /*
1972 * Select a set implementation based on the data characteristics and the
1973 * given policy. The total memory use might not be known if no size is
1974 * given, in that case the amount of memory per element is used.
1975 */
1976 static const struct nft_set_ops *
1977 nft_select_set_ops(const struct nlattr * const nla[],
1978 const struct nft_set_desc *desc,
1979 enum nft_set_policies policy)
1980 {
1981 const struct nft_set_ops *ops, *bops;
1982 struct nft_set_estimate est, best;
1983 u32 features;
1984
1985 #ifdef CONFIG_MODULES
1986 if (list_empty(&nf_tables_set_ops)) {
1987 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1988 request_module("nft-set");
1989 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1990 if (!list_empty(&nf_tables_set_ops))
1991 return ERR_PTR(-EAGAIN);
1992 }
1993 #endif
1994 features = 0;
1995 if (nla[NFTA_SET_FLAGS] != NULL) {
1996 features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
1997 features &= NFT_SET_INTERVAL | NFT_SET_MAP;
1998 }
1999
2000 bops = NULL;
2001 best.size = ~0;
2002 best.class = ~0;
2003
2004 list_for_each_entry(ops, &nf_tables_set_ops, list) {
2005 if ((ops->features & features) != features)
2006 continue;
2007 if (!ops->estimate(desc, features, &est))
2008 continue;
2009
2010 switch (policy) {
2011 case NFT_SET_POL_PERFORMANCE:
2012 if (est.class < best.class)
2013 break;
2014 if (est.class == best.class && est.size < best.size)
2015 break;
2016 continue;
2017 case NFT_SET_POL_MEMORY:
2018 if (est.size < best.size)
2019 break;
2020 if (est.size == best.size && est.class < best.class)
2021 break;
2022 continue;
2023 default:
2024 break;
2025 }
2026
2027 if (!try_module_get(ops->owner))
2028 continue;
2029 if (bops != NULL)
2030 module_put(bops->owner);
2031
2032 bops = ops;
2033 best = est;
2034 }
2035
2036 if (bops != NULL)
2037 return bops;
2038
2039 return ERR_PTR(-EOPNOTSUPP);
2040 }
2041
2042 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
2043 [NFTA_SET_TABLE] = { .type = NLA_STRING },
2044 [NFTA_SET_NAME] = { .type = NLA_STRING,
2045 .len = IFNAMSIZ - 1 },
2046 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
2047 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
2048 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
2049 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
2050 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
2051 [NFTA_SET_POLICY] = { .type = NLA_U32 },
2052 [NFTA_SET_DESC] = { .type = NLA_NESTED },
2053 [NFTA_SET_ID] = { .type = NLA_U32 },
2054 };
2055
2056 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
2057 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
2058 };
2059
2060 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
2061 const struct sk_buff *skb,
2062 const struct nlmsghdr *nlh,
2063 const struct nlattr * const nla[])
2064 {
2065 struct net *net = sock_net(skb->sk);
2066 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2067 struct nft_af_info *afi = NULL;
2068 struct nft_table *table = NULL;
2069
2070 if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
2071 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2072 if (IS_ERR(afi))
2073 return PTR_ERR(afi);
2074 }
2075
2076 if (nla[NFTA_SET_TABLE] != NULL) {
2077 if (afi == NULL)
2078 return -EAFNOSUPPORT;
2079
2080 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2081 if (IS_ERR(table))
2082 return PTR_ERR(table);
2083 if (table->flags & NFT_TABLE_INACTIVE)
2084 return -ENOENT;
2085 }
2086
2087 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2088 return 0;
2089 }
2090
2091 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
2092 const struct nlattr *nla)
2093 {
2094 struct nft_set *set;
2095
2096 if (nla == NULL)
2097 return ERR_PTR(-EINVAL);
2098
2099 list_for_each_entry(set, &table->sets, list) {
2100 if (!nla_strcmp(nla, set->name))
2101 return set;
2102 }
2103 return ERR_PTR(-ENOENT);
2104 }
2105
2106 struct nft_set *nf_tables_set_lookup_byid(const struct net *net,
2107 const struct nlattr *nla)
2108 {
2109 struct nft_trans *trans;
2110 u32 id = ntohl(nla_get_be32(nla));
2111
2112 list_for_each_entry(trans, &net->nft.commit_list, list) {
2113 if (trans->msg_type == NFT_MSG_NEWSET &&
2114 id == nft_trans_set_id(trans))
2115 return nft_trans_set(trans);
2116 }
2117 return ERR_PTR(-ENOENT);
2118 }
2119
2120 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
2121 const char *name)
2122 {
2123 const struct nft_set *i;
2124 const char *p;
2125 unsigned long *inuse;
2126 unsigned int n = 0, min = 0;
2127
2128 p = strnchr(name, IFNAMSIZ, '%');
2129 if (p != NULL) {
2130 if (p[1] != 'd' || strchr(p + 2, '%'))
2131 return -EINVAL;
2132
2133 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
2134 if (inuse == NULL)
2135 return -ENOMEM;
2136 cont:
2137 list_for_each_entry(i, &ctx->table->sets, list) {
2138 int tmp;
2139
2140 if (!sscanf(i->name, name, &tmp))
2141 continue;
2142 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
2143 continue;
2144
2145 set_bit(tmp - min, inuse);
2146 }
2147
2148 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
2149 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
2150 min += BITS_PER_BYTE * PAGE_SIZE;
2151 memset(inuse, 0, PAGE_SIZE);
2152 goto cont;
2153 }
2154 free_page((unsigned long)inuse);
2155 }
2156
2157 snprintf(set->name, sizeof(set->name), name, min + n);
2158 list_for_each_entry(i, &ctx->table->sets, list) {
2159 if (!strcmp(set->name, i->name))
2160 return -ENFILE;
2161 }
2162 return 0;
2163 }
2164
2165 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
2166 const struct nft_set *set, u16 event, u16 flags)
2167 {
2168 struct nfgenmsg *nfmsg;
2169 struct nlmsghdr *nlh;
2170 struct nlattr *desc;
2171 u32 portid = ctx->portid;
2172 u32 seq = ctx->seq;
2173
2174 event |= NFNL_SUBSYS_NFTABLES << 8;
2175 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2176 flags);
2177 if (nlh == NULL)
2178 goto nla_put_failure;
2179
2180 nfmsg = nlmsg_data(nlh);
2181 nfmsg->nfgen_family = ctx->afi->family;
2182 nfmsg->version = NFNETLINK_V0;
2183 nfmsg->res_id = 0;
2184
2185 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2186 goto nla_put_failure;
2187 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2188 goto nla_put_failure;
2189 if (set->flags != 0)
2190 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
2191 goto nla_put_failure;
2192
2193 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
2194 goto nla_put_failure;
2195 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
2196 goto nla_put_failure;
2197 if (set->flags & NFT_SET_MAP) {
2198 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
2199 goto nla_put_failure;
2200 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
2201 goto nla_put_failure;
2202 }
2203
2204 desc = nla_nest_start(skb, NFTA_SET_DESC);
2205 if (desc == NULL)
2206 goto nla_put_failure;
2207 if (set->size &&
2208 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
2209 goto nla_put_failure;
2210 nla_nest_end(skb, desc);
2211
2212 return nlmsg_end(skb, nlh);
2213
2214 nla_put_failure:
2215 nlmsg_trim(skb, nlh);
2216 return -1;
2217 }
2218
2219 static int nf_tables_set_notify(const struct nft_ctx *ctx,
2220 const struct nft_set *set,
2221 int event, gfp_t gfp_flags)
2222 {
2223 struct sk_buff *skb;
2224 u32 portid = ctx->portid;
2225 int err;
2226
2227 if (!ctx->report &&
2228 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2229 return 0;
2230
2231 err = -ENOBUFS;
2232 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
2233 if (skb == NULL)
2234 goto err;
2235
2236 err = nf_tables_fill_set(skb, ctx, set, event, 0);
2237 if (err < 0) {
2238 kfree_skb(skb);
2239 goto err;
2240 }
2241
2242 err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES,
2243 ctx->report, gfp_flags);
2244 err:
2245 if (err < 0)
2246 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err);
2247 return err;
2248 }
2249
2250 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2251 {
2252 const struct nft_set *set;
2253 unsigned int idx, s_idx = cb->args[0];
2254 struct nft_af_info *afi;
2255 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2256 struct net *net = sock_net(skb->sk);
2257 int cur_family = cb->args[3];
2258 struct nft_ctx *ctx = cb->data, ctx_set;
2259
2260 if (cb->args[1])
2261 return skb->len;
2262
2263 rcu_read_lock();
2264 cb->seq = net->nft.base_seq;
2265
2266 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2267 if (ctx->afi && ctx->afi != afi)
2268 continue;
2269
2270 if (cur_family) {
2271 if (afi->family != cur_family)
2272 continue;
2273
2274 cur_family = 0;
2275 }
2276 list_for_each_entry_rcu(table, &afi->tables, list) {
2277 if (ctx->table && ctx->table != table)
2278 continue;
2279
2280 if (cur_table) {
2281 if (cur_table != table)
2282 continue;
2283
2284 cur_table = NULL;
2285 }
2286 idx = 0;
2287 list_for_each_entry_rcu(set, &table->sets, list) {
2288 if (idx < s_idx)
2289 goto cont;
2290
2291 ctx_set = *ctx;
2292 ctx_set.table = table;
2293 ctx_set.afi = afi;
2294 if (nf_tables_fill_set(skb, &ctx_set, set,
2295 NFT_MSG_NEWSET,
2296 NLM_F_MULTI) < 0) {
2297 cb->args[0] = idx;
2298 cb->args[2] = (unsigned long) table;
2299 cb->args[3] = afi->family;
2300 goto done;
2301 }
2302 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2303 cont:
2304 idx++;
2305 }
2306 if (s_idx)
2307 s_idx = 0;
2308 }
2309 }
2310 cb->args[1] = 1;
2311 done:
2312 rcu_read_unlock();
2313 return skb->len;
2314 }
2315
2316 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
2317 {
2318 kfree(cb->data);
2319 return 0;
2320 }
2321
2322 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2323
2324 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2325 const struct nlmsghdr *nlh,
2326 const struct nlattr * const nla[])
2327 {
2328 const struct nft_set *set;
2329 struct nft_ctx ctx;
2330 struct sk_buff *skb2;
2331 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2332 int err;
2333
2334 /* Verify existance before starting dump */
2335 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2336 if (err < 0)
2337 return err;
2338
2339 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2340 struct netlink_dump_control c = {
2341 .dump = nf_tables_dump_sets,
2342 .done = nf_tables_dump_sets_done,
2343 };
2344 struct nft_ctx *ctx_dump;
2345
2346 ctx_dump = kmalloc(sizeof(*ctx_dump), GFP_KERNEL);
2347 if (ctx_dump == NULL)
2348 return -ENOMEM;
2349
2350 *ctx_dump = ctx;
2351 c.data = ctx_dump;
2352
2353 return netlink_dump_start(nlsk, skb, nlh, &c);
2354 }
2355
2356 /* Only accept unspec with dump */
2357 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2358 return -EAFNOSUPPORT;
2359
2360 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2361 if (IS_ERR(set))
2362 return PTR_ERR(set);
2363 if (set->flags & NFT_SET_INACTIVE)
2364 return -ENOENT;
2365
2366 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2367 if (skb2 == NULL)
2368 return -ENOMEM;
2369
2370 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2371 if (err < 0)
2372 goto err;
2373
2374 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2375
2376 err:
2377 kfree_skb(skb2);
2378 return err;
2379 }
2380
2381 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2382 struct nft_set_desc *desc,
2383 const struct nlattr *nla)
2384 {
2385 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2386 int err;
2387
2388 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2389 if (err < 0)
2390 return err;
2391
2392 if (da[NFTA_SET_DESC_SIZE] != NULL)
2393 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2394
2395 return 0;
2396 }
2397
2398 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2399 struct nft_set *set)
2400 {
2401 struct nft_trans *trans;
2402
2403 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2404 if (trans == NULL)
2405 return -ENOMEM;
2406
2407 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2408 nft_trans_set_id(trans) =
2409 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2410 set->flags |= NFT_SET_INACTIVE;
2411 }
2412 nft_trans_set(trans) = set;
2413 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2414
2415 return 0;
2416 }
2417
2418 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2419 const struct nlmsghdr *nlh,
2420 const struct nlattr * const nla[])
2421 {
2422 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2423 const struct nft_set_ops *ops;
2424 struct nft_af_info *afi;
2425 struct net *net = sock_net(skb->sk);
2426 struct nft_table *table;
2427 struct nft_set *set;
2428 struct nft_ctx ctx;
2429 char name[IFNAMSIZ];
2430 unsigned int size;
2431 bool create;
2432 u32 ktype, dtype, flags, policy;
2433 struct nft_set_desc desc;
2434 int err;
2435
2436 if (nla[NFTA_SET_TABLE] == NULL ||
2437 nla[NFTA_SET_NAME] == NULL ||
2438 nla[NFTA_SET_KEY_LEN] == NULL ||
2439 nla[NFTA_SET_ID] == NULL)
2440 return -EINVAL;
2441
2442 memset(&desc, 0, sizeof(desc));
2443
2444 ktype = NFT_DATA_VALUE;
2445 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2446 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2447 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2448 return -EINVAL;
2449 }
2450
2451 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2452 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2453 return -EINVAL;
2454
2455 flags = 0;
2456 if (nla[NFTA_SET_FLAGS] != NULL) {
2457 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2458 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2459 NFT_SET_INTERVAL | NFT_SET_MAP))
2460 return -EINVAL;
2461 }
2462
2463 dtype = 0;
2464 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2465 if (!(flags & NFT_SET_MAP))
2466 return -EINVAL;
2467
2468 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2469 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2470 dtype != NFT_DATA_VERDICT)
2471 return -EINVAL;
2472
2473 if (dtype != NFT_DATA_VERDICT) {
2474 if (nla[NFTA_SET_DATA_LEN] == NULL)
2475 return -EINVAL;
2476 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2477 if (desc.dlen == 0 ||
2478 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2479 return -EINVAL;
2480 } else
2481 desc.dlen = sizeof(struct nft_data);
2482 } else if (flags & NFT_SET_MAP)
2483 return -EINVAL;
2484
2485 policy = NFT_SET_POL_PERFORMANCE;
2486 if (nla[NFTA_SET_POLICY] != NULL)
2487 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2488
2489 if (nla[NFTA_SET_DESC] != NULL) {
2490 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2491 if (err < 0)
2492 return err;
2493 }
2494
2495 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2496
2497 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2498 if (IS_ERR(afi))
2499 return PTR_ERR(afi);
2500
2501 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2502 if (IS_ERR(table))
2503 return PTR_ERR(table);
2504
2505 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2506
2507 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2508 if (IS_ERR(set)) {
2509 if (PTR_ERR(set) != -ENOENT)
2510 return PTR_ERR(set);
2511 set = NULL;
2512 }
2513
2514 if (set != NULL) {
2515 if (nlh->nlmsg_flags & NLM_F_EXCL)
2516 return -EEXIST;
2517 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2518 return -EOPNOTSUPP;
2519 return 0;
2520 }
2521
2522 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2523 return -ENOENT;
2524
2525 ops = nft_select_set_ops(nla, &desc, policy);
2526 if (IS_ERR(ops))
2527 return PTR_ERR(ops);
2528
2529 size = 0;
2530 if (ops->privsize != NULL)
2531 size = ops->privsize(nla);
2532
2533 err = -ENOMEM;
2534 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2535 if (set == NULL)
2536 goto err1;
2537
2538 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2539 err = nf_tables_set_alloc_name(&ctx, set, name);
2540 if (err < 0)
2541 goto err2;
2542
2543 INIT_LIST_HEAD(&set->bindings);
2544 set->ops = ops;
2545 set->ktype = ktype;
2546 set->klen = desc.klen;
2547 set->dtype = dtype;
2548 set->dlen = desc.dlen;
2549 set->flags = flags;
2550 set->size = desc.size;
2551
2552 err = ops->init(set, &desc, nla);
2553 if (err < 0)
2554 goto err2;
2555
2556 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2557 if (err < 0)
2558 goto err2;
2559
2560 list_add_tail_rcu(&set->list, &table->sets);
2561 table->use++;
2562 return 0;
2563
2564 err2:
2565 kfree(set);
2566 err1:
2567 module_put(ops->owner);
2568 return err;
2569 }
2570
2571 static void nft_set_destroy(struct nft_set *set)
2572 {
2573 set->ops->destroy(set);
2574 module_put(set->ops->owner);
2575 kfree(set);
2576 }
2577
2578 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2579 {
2580 list_del_rcu(&set->list);
2581 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2582 nft_set_destroy(set);
2583 }
2584
2585 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2586 const struct nlmsghdr *nlh,
2587 const struct nlattr * const nla[])
2588 {
2589 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2590 struct nft_set *set;
2591 struct nft_ctx ctx;
2592 int err;
2593
2594 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2595 return -EAFNOSUPPORT;
2596 if (nla[NFTA_SET_TABLE] == NULL)
2597 return -EINVAL;
2598
2599 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2600 if (err < 0)
2601 return err;
2602
2603 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2604 if (IS_ERR(set))
2605 return PTR_ERR(set);
2606 if (set->flags & NFT_SET_INACTIVE)
2607 return -ENOENT;
2608 if (!list_empty(&set->bindings))
2609 return -EBUSY;
2610
2611 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2612 if (err < 0)
2613 return err;
2614
2615 list_del_rcu(&set->list);
2616 ctx.table->use--;
2617 return 0;
2618 }
2619
2620 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2621 const struct nft_set *set,
2622 const struct nft_set_iter *iter,
2623 const struct nft_set_elem *elem)
2624 {
2625 enum nft_registers dreg;
2626
2627 dreg = nft_type_to_reg(set->dtype);
2628 return nft_validate_data_load(ctx, dreg, &elem->data,
2629 set->dtype == NFT_DATA_VERDICT ?
2630 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2631 }
2632
2633 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2634 struct nft_set_binding *binding)
2635 {
2636 struct nft_set_binding *i;
2637 struct nft_set_iter iter;
2638
2639 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2640 return -EBUSY;
2641
2642 if (set->flags & NFT_SET_MAP) {
2643 /* If the set is already bound to the same chain all
2644 * jumps are already validated for that chain.
2645 */
2646 list_for_each_entry(i, &set->bindings, list) {
2647 if (i->chain == binding->chain)
2648 goto bind;
2649 }
2650
2651 iter.skip = 0;
2652 iter.count = 0;
2653 iter.err = 0;
2654 iter.fn = nf_tables_bind_check_setelem;
2655
2656 set->ops->walk(ctx, set, &iter);
2657 if (iter.err < 0) {
2658 /* Destroy anonymous sets if binding fails */
2659 if (set->flags & NFT_SET_ANONYMOUS)
2660 nf_tables_set_destroy(ctx, set);
2661
2662 return iter.err;
2663 }
2664 }
2665 bind:
2666 binding->chain = ctx->chain;
2667 list_add_tail_rcu(&binding->list, &set->bindings);
2668 return 0;
2669 }
2670
2671 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2672 struct nft_set_binding *binding)
2673 {
2674 list_del_rcu(&binding->list);
2675
2676 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2677 !(set->flags & NFT_SET_INACTIVE))
2678 nf_tables_set_destroy(ctx, set);
2679 }
2680
2681 /*
2682 * Set elements
2683 */
2684
2685 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2686 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2687 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2688 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2689 };
2690
2691 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2692 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2693 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2694 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2695 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2696 };
2697
2698 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2699 const struct sk_buff *skb,
2700 const struct nlmsghdr *nlh,
2701 const struct nlattr * const nla[],
2702 bool trans)
2703 {
2704 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2705 struct nft_af_info *afi;
2706 struct nft_table *table;
2707 struct net *net = sock_net(skb->sk);
2708
2709 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2710 if (IS_ERR(afi))
2711 return PTR_ERR(afi);
2712
2713 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2714 if (IS_ERR(table))
2715 return PTR_ERR(table);
2716 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2717 return -ENOENT;
2718
2719 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2720 return 0;
2721 }
2722
2723 static int nf_tables_fill_setelem(struct sk_buff *skb,
2724 const struct nft_set *set,
2725 const struct nft_set_elem *elem)
2726 {
2727 unsigned char *b = skb_tail_pointer(skb);
2728 struct nlattr *nest;
2729
2730 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2731 if (nest == NULL)
2732 goto nla_put_failure;
2733
2734 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2735 set->klen) < 0)
2736 goto nla_put_failure;
2737
2738 if (set->flags & NFT_SET_MAP &&
2739 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2740 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2741 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2742 set->dlen) < 0)
2743 goto nla_put_failure;
2744
2745 if (elem->flags != 0)
2746 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2747 goto nla_put_failure;
2748
2749 nla_nest_end(skb, nest);
2750 return 0;
2751
2752 nla_put_failure:
2753 nlmsg_trim(skb, b);
2754 return -EMSGSIZE;
2755 }
2756
2757 struct nft_set_dump_args {
2758 const struct netlink_callback *cb;
2759 struct nft_set_iter iter;
2760 struct sk_buff *skb;
2761 };
2762
2763 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2764 const struct nft_set *set,
2765 const struct nft_set_iter *iter,
2766 const struct nft_set_elem *elem)
2767 {
2768 struct nft_set_dump_args *args;
2769
2770 args = container_of(iter, struct nft_set_dump_args, iter);
2771 return nf_tables_fill_setelem(args->skb, set, elem);
2772 }
2773
2774 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2775 {
2776 const struct nft_set *set;
2777 struct nft_set_dump_args args;
2778 struct nft_ctx ctx;
2779 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2780 struct nfgenmsg *nfmsg;
2781 struct nlmsghdr *nlh;
2782 struct nlattr *nest;
2783 u32 portid, seq;
2784 int event, err;
2785
2786 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2787 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2788 if (err < 0)
2789 return err;
2790
2791 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2792 false);
2793 if (err < 0)
2794 return err;
2795
2796 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2797 if (IS_ERR(set))
2798 return PTR_ERR(set);
2799 if (set->flags & NFT_SET_INACTIVE)
2800 return -ENOENT;
2801
2802 event = NFT_MSG_NEWSETELEM;
2803 event |= NFNL_SUBSYS_NFTABLES << 8;
2804 portid = NETLINK_CB(cb->skb).portid;
2805 seq = cb->nlh->nlmsg_seq;
2806
2807 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2808 NLM_F_MULTI);
2809 if (nlh == NULL)
2810 goto nla_put_failure;
2811
2812 nfmsg = nlmsg_data(nlh);
2813 nfmsg->nfgen_family = ctx.afi->family;
2814 nfmsg->version = NFNETLINK_V0;
2815 nfmsg->res_id = 0;
2816
2817 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2818 goto nla_put_failure;
2819 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2820 goto nla_put_failure;
2821
2822 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2823 if (nest == NULL)
2824 goto nla_put_failure;
2825
2826 args.cb = cb;
2827 args.skb = skb;
2828 args.iter.skip = cb->args[0];
2829 args.iter.count = 0;
2830 args.iter.err = 0;
2831 args.iter.fn = nf_tables_dump_setelem;
2832 set->ops->walk(&ctx, set, &args.iter);
2833
2834 nla_nest_end(skb, nest);
2835 nlmsg_end(skb, nlh);
2836
2837 if (args.iter.err && args.iter.err != -EMSGSIZE)
2838 return args.iter.err;
2839 if (args.iter.count == cb->args[0])
2840 return 0;
2841
2842 cb->args[0] = args.iter.count;
2843 return skb->len;
2844
2845 nla_put_failure:
2846 return -ENOSPC;
2847 }
2848
2849 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2850 const struct nlmsghdr *nlh,
2851 const struct nlattr * const nla[])
2852 {
2853 const struct nft_set *set;
2854 struct nft_ctx ctx;
2855 int err;
2856
2857 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2858 if (err < 0)
2859 return err;
2860
2861 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2862 if (IS_ERR(set))
2863 return PTR_ERR(set);
2864 if (set->flags & NFT_SET_INACTIVE)
2865 return -ENOENT;
2866
2867 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2868 struct netlink_dump_control c = {
2869 .dump = nf_tables_dump_set,
2870 };
2871 return netlink_dump_start(nlsk, skb, nlh, &c);
2872 }
2873 return -EOPNOTSUPP;
2874 }
2875
2876 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2877 const struct nft_ctx *ctx, u32 seq,
2878 u32 portid, int event, u16 flags,
2879 const struct nft_set *set,
2880 const struct nft_set_elem *elem)
2881 {
2882 struct nfgenmsg *nfmsg;
2883 struct nlmsghdr *nlh;
2884 struct nlattr *nest;
2885 int err;
2886
2887 event |= NFNL_SUBSYS_NFTABLES << 8;
2888 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2889 flags);
2890 if (nlh == NULL)
2891 goto nla_put_failure;
2892
2893 nfmsg = nlmsg_data(nlh);
2894 nfmsg->nfgen_family = ctx->afi->family;
2895 nfmsg->version = NFNETLINK_V0;
2896 nfmsg->res_id = 0;
2897
2898 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2899 goto nla_put_failure;
2900 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2901 goto nla_put_failure;
2902
2903 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2904 if (nest == NULL)
2905 goto nla_put_failure;
2906
2907 err = nf_tables_fill_setelem(skb, set, elem);
2908 if (err < 0)
2909 goto nla_put_failure;
2910
2911 nla_nest_end(skb, nest);
2912
2913 return nlmsg_end(skb, nlh);
2914
2915 nla_put_failure:
2916 nlmsg_trim(skb, nlh);
2917 return -1;
2918 }
2919
2920 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2921 const struct nft_set *set,
2922 const struct nft_set_elem *elem,
2923 int event, u16 flags)
2924 {
2925 struct net *net = ctx->net;
2926 u32 portid = ctx->portid;
2927 struct sk_buff *skb;
2928 int err;
2929
2930 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
2931 return 0;
2932
2933 err = -ENOBUFS;
2934 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2935 if (skb == NULL)
2936 goto err;
2937
2938 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
2939 set, elem);
2940 if (err < 0) {
2941 kfree_skb(skb);
2942 goto err;
2943 }
2944
2945 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
2946 GFP_KERNEL);
2947 err:
2948 if (err < 0)
2949 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
2950 return err;
2951 }
2952
2953 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
2954 int msg_type,
2955 struct nft_set *set)
2956 {
2957 struct nft_trans *trans;
2958
2959 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
2960 if (trans == NULL)
2961 return NULL;
2962
2963 nft_trans_elem_set(trans) = set;
2964 return trans;
2965 }
2966
2967 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
2968 const struct nlattr *attr)
2969 {
2970 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
2971 struct nft_data_desc d1, d2;
2972 struct nft_set_elem elem;
2973 struct nft_set_binding *binding;
2974 enum nft_registers dreg;
2975 struct nft_trans *trans;
2976 int err;
2977
2978 if (set->size && set->nelems == set->size)
2979 return -ENFILE;
2980
2981 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
2982 nft_set_elem_policy);
2983 if (err < 0)
2984 return err;
2985
2986 if (nla[NFTA_SET_ELEM_KEY] == NULL)
2987 return -EINVAL;
2988
2989 elem.flags = 0;
2990 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
2991 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
2992 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
2993 return -EINVAL;
2994 }
2995
2996 if (set->flags & NFT_SET_MAP) {
2997 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
2998 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
2999 return -EINVAL;
3000 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3001 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3002 return -EINVAL;
3003 } else {
3004 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3005 return -EINVAL;
3006 }
3007
3008 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3009 if (err < 0)
3010 goto err1;
3011 err = -EINVAL;
3012 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3013 goto err2;
3014
3015 err = -EEXIST;
3016 if (set->ops->get(set, &elem) == 0)
3017 goto err2;
3018
3019 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3020 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3021 if (err < 0)
3022 goto err2;
3023
3024 err = -EINVAL;
3025 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3026 goto err3;
3027
3028 dreg = nft_type_to_reg(set->dtype);
3029 list_for_each_entry(binding, &set->bindings, list) {
3030 struct nft_ctx bind_ctx = {
3031 .afi = ctx->afi,
3032 .table = ctx->table,
3033 .chain = (struct nft_chain *)binding->chain,
3034 };
3035
3036 err = nft_validate_data_load(&bind_ctx, dreg,
3037 &elem.data, d2.type);
3038 if (err < 0)
3039 goto err3;
3040 }
3041 }
3042
3043 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3044 if (trans == NULL)
3045 goto err3;
3046
3047 err = set->ops->insert(set, &elem);
3048 if (err < 0)
3049 goto err4;
3050
3051 nft_trans_elem(trans) = elem;
3052 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3053 return 0;
3054
3055 err4:
3056 kfree(trans);
3057 err3:
3058 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3059 nft_data_uninit(&elem.data, d2.type);
3060 err2:
3061 nft_data_uninit(&elem.key, d1.type);
3062 err1:
3063 return err;
3064 }
3065
3066 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3067 const struct nlmsghdr *nlh,
3068 const struct nlattr * const nla[])
3069 {
3070 struct net *net = sock_net(skb->sk);
3071 const struct nlattr *attr;
3072 struct nft_set *set;
3073 struct nft_ctx ctx;
3074 int rem, err = 0;
3075
3076 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3077 if (err < 0)
3078 return err;
3079
3080 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3081 if (IS_ERR(set)) {
3082 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3083 set = nf_tables_set_lookup_byid(net,
3084 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3085 }
3086 if (IS_ERR(set))
3087 return PTR_ERR(set);
3088 }
3089
3090 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3091 return -EBUSY;
3092
3093 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3094 err = nft_add_set_elem(&ctx, set, attr);
3095 if (err < 0)
3096 break;
3097
3098 set->nelems++;
3099 }
3100 return err;
3101 }
3102
3103 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3104 const struct nlattr *attr)
3105 {
3106 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3107 struct nft_data_desc desc;
3108 struct nft_set_elem elem;
3109 struct nft_trans *trans;
3110 int err;
3111
3112 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3113 nft_set_elem_policy);
3114 if (err < 0)
3115 goto err1;
3116
3117 err = -EINVAL;
3118 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3119 goto err1;
3120
3121 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3122 if (err < 0)
3123 goto err1;
3124
3125 err = -EINVAL;
3126 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3127 goto err2;
3128
3129 err = set->ops->get(set, &elem);
3130 if (err < 0)
3131 goto err2;
3132
3133 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3134 if (trans == NULL)
3135 goto err2;
3136
3137 nft_trans_elem(trans) = elem;
3138 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3139
3140 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3141 if (set->flags & NFT_SET_MAP)
3142 nft_data_uninit(&elem.data, set->dtype);
3143
3144 err2:
3145 nft_data_uninit(&elem.key, desc.type);
3146 err1:
3147 return err;
3148 }
3149
3150 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3151 const struct nlmsghdr *nlh,
3152 const struct nlattr * const nla[])
3153 {
3154 const struct nlattr *attr;
3155 struct nft_set *set;
3156 struct nft_ctx ctx;
3157 int rem, err = 0;
3158
3159 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3160 if (err < 0)
3161 return err;
3162
3163 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3164 if (IS_ERR(set))
3165 return PTR_ERR(set);
3166 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3167 return -EBUSY;
3168
3169 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3170 err = nft_del_setelem(&ctx, set, attr);
3171 if (err < 0)
3172 break;
3173
3174 set->nelems--;
3175 }
3176 return err;
3177 }
3178
3179 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3180 [NFT_MSG_NEWTABLE] = {
3181 .call_batch = nf_tables_newtable,
3182 .attr_count = NFTA_TABLE_MAX,
3183 .policy = nft_table_policy,
3184 },
3185 [NFT_MSG_GETTABLE] = {
3186 .call = nf_tables_gettable,
3187 .attr_count = NFTA_TABLE_MAX,
3188 .policy = nft_table_policy,
3189 },
3190 [NFT_MSG_DELTABLE] = {
3191 .call_batch = nf_tables_deltable,
3192 .attr_count = NFTA_TABLE_MAX,
3193 .policy = nft_table_policy,
3194 },
3195 [NFT_MSG_NEWCHAIN] = {
3196 .call_batch = nf_tables_newchain,
3197 .attr_count = NFTA_CHAIN_MAX,
3198 .policy = nft_chain_policy,
3199 },
3200 [NFT_MSG_GETCHAIN] = {
3201 .call = nf_tables_getchain,
3202 .attr_count = NFTA_CHAIN_MAX,
3203 .policy = nft_chain_policy,
3204 },
3205 [NFT_MSG_DELCHAIN] = {
3206 .call_batch = nf_tables_delchain,
3207 .attr_count = NFTA_CHAIN_MAX,
3208 .policy = nft_chain_policy,
3209 },
3210 [NFT_MSG_NEWRULE] = {
3211 .call_batch = nf_tables_newrule,
3212 .attr_count = NFTA_RULE_MAX,
3213 .policy = nft_rule_policy,
3214 },
3215 [NFT_MSG_GETRULE] = {
3216 .call = nf_tables_getrule,
3217 .attr_count = NFTA_RULE_MAX,
3218 .policy = nft_rule_policy,
3219 },
3220 [NFT_MSG_DELRULE] = {
3221 .call_batch = nf_tables_delrule,
3222 .attr_count = NFTA_RULE_MAX,
3223 .policy = nft_rule_policy,
3224 },
3225 [NFT_MSG_NEWSET] = {
3226 .call_batch = nf_tables_newset,
3227 .attr_count = NFTA_SET_MAX,
3228 .policy = nft_set_policy,
3229 },
3230 [NFT_MSG_GETSET] = {
3231 .call = nf_tables_getset,
3232 .attr_count = NFTA_SET_MAX,
3233 .policy = nft_set_policy,
3234 },
3235 [NFT_MSG_DELSET] = {
3236 .call_batch = nf_tables_delset,
3237 .attr_count = NFTA_SET_MAX,
3238 .policy = nft_set_policy,
3239 },
3240 [NFT_MSG_NEWSETELEM] = {
3241 .call_batch = nf_tables_newsetelem,
3242 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3243 .policy = nft_set_elem_list_policy,
3244 },
3245 [NFT_MSG_GETSETELEM] = {
3246 .call = nf_tables_getsetelem,
3247 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3248 .policy = nft_set_elem_list_policy,
3249 },
3250 [NFT_MSG_DELSETELEM] = {
3251 .call_batch = nf_tables_delsetelem,
3252 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3253 .policy = nft_set_elem_list_policy,
3254 },
3255 };
3256
3257 static void nft_chain_commit_update(struct nft_trans *trans)
3258 {
3259 struct nft_base_chain *basechain;
3260
3261 if (nft_trans_chain_name(trans)[0])
3262 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3263
3264 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3265 return;
3266
3267 basechain = nft_base_chain(trans->ctx.chain);
3268 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3269
3270 switch (nft_trans_chain_policy(trans)) {
3271 case NF_DROP:
3272 case NF_ACCEPT:
3273 basechain->policy = nft_trans_chain_policy(trans);
3274 break;
3275 }
3276 }
3277
3278 /* Schedule objects for release via rcu to make sure no packets are accesing
3279 * removed rules.
3280 */
3281 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3282 {
3283 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3284
3285 switch (trans->msg_type) {
3286 case NFT_MSG_DELTABLE:
3287 nf_tables_table_destroy(&trans->ctx);
3288 break;
3289 case NFT_MSG_DELCHAIN:
3290 nf_tables_chain_destroy(trans->ctx.chain);
3291 break;
3292 case NFT_MSG_DELRULE:
3293 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3294 break;
3295 case NFT_MSG_DELSET:
3296 nft_set_destroy(nft_trans_set(trans));
3297 break;
3298 }
3299 kfree(trans);
3300 }
3301
3302 static int nf_tables_commit(struct sk_buff *skb)
3303 {
3304 struct net *net = sock_net(skb->sk);
3305 struct nft_trans *trans, *next;
3306 struct nft_set *set;
3307
3308 /* Bump generation counter, invalidate any dump in progress */
3309 while (++net->nft.base_seq == 0);
3310
3311 /* A new generation has just started */
3312 net->nft.gencursor = gencursor_next(net);
3313
3314 /* Make sure all packets have left the previous generation before
3315 * purging old rules.
3316 */
3317 synchronize_rcu();
3318
3319 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3320 switch (trans->msg_type) {
3321 case NFT_MSG_NEWTABLE:
3322 if (nft_trans_table_update(trans)) {
3323 if (!nft_trans_table_enable(trans)) {
3324 nf_tables_table_disable(trans->ctx.afi,
3325 trans->ctx.table);
3326 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3327 }
3328 } else {
3329 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3330 }
3331 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3332 nft_trans_destroy(trans);
3333 break;
3334 case NFT_MSG_DELTABLE:
3335 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3336 break;
3337 case NFT_MSG_NEWCHAIN:
3338 if (nft_trans_chain_update(trans))
3339 nft_chain_commit_update(trans);
3340 else
3341 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3342
3343 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3344 nft_trans_destroy(trans);
3345 break;
3346 case NFT_MSG_DELCHAIN:
3347 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3348 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3349 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3350 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3351 trans->ctx.afi->nops);
3352 }
3353 break;
3354 case NFT_MSG_NEWRULE:
3355 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3356 nf_tables_rule_notify(&trans->ctx,
3357 nft_trans_rule(trans),
3358 NFT_MSG_NEWRULE);
3359 nft_trans_destroy(trans);
3360 break;
3361 case NFT_MSG_DELRULE:
3362 list_del_rcu(&nft_trans_rule(trans)->list);
3363 nf_tables_rule_notify(&trans->ctx,
3364 nft_trans_rule(trans),
3365 NFT_MSG_DELRULE);
3366 break;
3367 case NFT_MSG_NEWSET:
3368 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3369 /* This avoids hitting -EBUSY when deleting the table
3370 * from the transaction.
3371 */
3372 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3373 !list_empty(&nft_trans_set(trans)->bindings))
3374 trans->ctx.table->use--;
3375
3376 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3377 NFT_MSG_NEWSET, GFP_KERNEL);
3378 nft_trans_destroy(trans);
3379 break;
3380 case NFT_MSG_DELSET:
3381 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3382 NFT_MSG_DELSET, GFP_KERNEL);
3383 break;
3384 case NFT_MSG_NEWSETELEM:
3385 nf_tables_setelem_notify(&trans->ctx,
3386 nft_trans_elem_set(trans),
3387 &nft_trans_elem(trans),
3388 NFT_MSG_NEWSETELEM, 0);
3389 nft_trans_destroy(trans);
3390 break;
3391 case NFT_MSG_DELSETELEM:
3392 nf_tables_setelem_notify(&trans->ctx,
3393 nft_trans_elem_set(trans),
3394 &nft_trans_elem(trans),
3395 NFT_MSG_DELSETELEM, 0);
3396 set = nft_trans_elem_set(trans);
3397 set->ops->get(set, &nft_trans_elem(trans));
3398 set->ops->remove(set, &nft_trans_elem(trans));
3399 nft_trans_destroy(trans);
3400 break;
3401 }
3402 }
3403
3404 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3405 list_del(&trans->list);
3406 trans->ctx.nla = NULL;
3407 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3408 }
3409
3410 return 0;
3411 }
3412
3413 /* Schedule objects for release via rcu to make sure no packets are accesing
3414 * aborted rules.
3415 */
3416 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3417 {
3418 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3419
3420 switch (trans->msg_type) {
3421 case NFT_MSG_NEWTABLE:
3422 nf_tables_table_destroy(&trans->ctx);
3423 break;
3424 case NFT_MSG_NEWCHAIN:
3425 nf_tables_chain_destroy(trans->ctx.chain);
3426 break;
3427 case NFT_MSG_NEWRULE:
3428 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3429 break;
3430 case NFT_MSG_NEWSET:
3431 nft_set_destroy(nft_trans_set(trans));
3432 break;
3433 }
3434 kfree(trans);
3435 }
3436
3437 static int nf_tables_abort(struct sk_buff *skb)
3438 {
3439 struct net *net = sock_net(skb->sk);
3440 struct nft_trans *trans, *next;
3441 struct nft_set *set;
3442
3443 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3444 switch (trans->msg_type) {
3445 case NFT_MSG_NEWTABLE:
3446 if (nft_trans_table_update(trans)) {
3447 if (nft_trans_table_enable(trans)) {
3448 nf_tables_table_disable(trans->ctx.afi,
3449 trans->ctx.table);
3450 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3451 }
3452 nft_trans_destroy(trans);
3453 } else {
3454 list_del_rcu(&trans->ctx.table->list);
3455 }
3456 break;
3457 case NFT_MSG_DELTABLE:
3458 list_add_tail_rcu(&trans->ctx.table->list,
3459 &trans->ctx.afi->tables);
3460 nft_trans_destroy(trans);
3461 break;
3462 case NFT_MSG_NEWCHAIN:
3463 if (nft_trans_chain_update(trans)) {
3464 if (nft_trans_chain_stats(trans))
3465 free_percpu(nft_trans_chain_stats(trans));
3466
3467 nft_trans_destroy(trans);
3468 } else {
3469 trans->ctx.table->use--;
3470 list_del_rcu(&trans->ctx.chain->list);
3471 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3472 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3473 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3474 trans->ctx.afi->nops);
3475 }
3476 }
3477 break;
3478 case NFT_MSG_DELCHAIN:
3479 trans->ctx.table->use++;
3480 list_add_tail_rcu(&trans->ctx.chain->list,
3481 &trans->ctx.table->chains);
3482 nft_trans_destroy(trans);
3483 break;
3484 case NFT_MSG_NEWRULE:
3485 trans->ctx.chain->use--;
3486 list_del_rcu(&nft_trans_rule(trans)->list);
3487 break;
3488 case NFT_MSG_DELRULE:
3489 trans->ctx.chain->use++;
3490 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3491 nft_trans_destroy(trans);
3492 break;
3493 case NFT_MSG_NEWSET:
3494 trans->ctx.table->use--;
3495 list_del_rcu(&nft_trans_set(trans)->list);
3496 break;
3497 case NFT_MSG_DELSET:
3498 trans->ctx.table->use++;
3499 list_add_tail_rcu(&nft_trans_set(trans)->list,
3500 &trans->ctx.table->sets);
3501 nft_trans_destroy(trans);
3502 break;
3503 case NFT_MSG_NEWSETELEM:
3504 nft_trans_elem_set(trans)->nelems--;
3505 set = nft_trans_elem_set(trans);
3506 set->ops->get(set, &nft_trans_elem(trans));
3507 set->ops->remove(set, &nft_trans_elem(trans));
3508 nft_trans_destroy(trans);
3509 break;
3510 case NFT_MSG_DELSETELEM:
3511 nft_trans_elem_set(trans)->nelems++;
3512 nft_trans_destroy(trans);
3513 break;
3514 }
3515 }
3516
3517 list_for_each_entry_safe_reverse(trans, next,
3518 &net->nft.commit_list, list) {
3519 list_del(&trans->list);
3520 trans->ctx.nla = NULL;
3521 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3522 }
3523
3524 return 0;
3525 }
3526
3527 static const struct nfnetlink_subsystem nf_tables_subsys = {
3528 .name = "nf_tables",
3529 .subsys_id = NFNL_SUBSYS_NFTABLES,
3530 .cb_count = NFT_MSG_MAX,
3531 .cb = nf_tables_cb,
3532 .commit = nf_tables_commit,
3533 .abort = nf_tables_abort,
3534 };
3535
3536 /*
3537 * Loop detection - walk through the ruleset beginning at the destination chain
3538 * of a new jump until either the source chain is reached (loop) or all
3539 * reachable chains have been traversed.
3540 *
3541 * The loop check is performed whenever a new jump verdict is added to an
3542 * expression or verdict map or a verdict map is bound to a new chain.
3543 */
3544
3545 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3546 const struct nft_chain *chain);
3547
3548 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3549 const struct nft_set *set,
3550 const struct nft_set_iter *iter,
3551 const struct nft_set_elem *elem)
3552 {
3553 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3554 return 0;
3555
3556 switch (elem->data.verdict) {
3557 case NFT_JUMP:
3558 case NFT_GOTO:
3559 return nf_tables_check_loops(ctx, elem->data.chain);
3560 default:
3561 return 0;
3562 }
3563 }
3564
3565 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3566 const struct nft_chain *chain)
3567 {
3568 const struct nft_rule *rule;
3569 const struct nft_expr *expr, *last;
3570 const struct nft_set *set;
3571 struct nft_set_binding *binding;
3572 struct nft_set_iter iter;
3573
3574 if (ctx->chain == chain)
3575 return -ELOOP;
3576
3577 list_for_each_entry(rule, &chain->rules, list) {
3578 nft_rule_for_each_expr(expr, last, rule) {
3579 const struct nft_data *data = NULL;
3580 int err;
3581
3582 if (!expr->ops->validate)
3583 continue;
3584
3585 err = expr->ops->validate(ctx, expr, &data);
3586 if (err < 0)
3587 return err;
3588
3589 if (data == NULL)
3590 continue;
3591
3592 switch (data->verdict) {
3593 case NFT_JUMP:
3594 case NFT_GOTO:
3595 err = nf_tables_check_loops(ctx, data->chain);
3596 if (err < 0)
3597 return err;
3598 default:
3599 break;
3600 }
3601 }
3602 }
3603
3604 list_for_each_entry(set, &ctx->table->sets, list) {
3605 if (!(set->flags & NFT_SET_MAP) ||
3606 set->dtype != NFT_DATA_VERDICT)
3607 continue;
3608
3609 list_for_each_entry(binding, &set->bindings, list) {
3610 if (binding->chain != chain)
3611 continue;
3612
3613 iter.skip = 0;
3614 iter.count = 0;
3615 iter.err = 0;
3616 iter.fn = nf_tables_loop_check_setelem;
3617
3618 set->ops->walk(ctx, set, &iter);
3619 if (iter.err < 0)
3620 return iter.err;
3621 }
3622 }
3623
3624 return 0;
3625 }
3626
3627 /**
3628 * nft_validate_input_register - validate an expressions' input register
3629 *
3630 * @reg: the register number
3631 *
3632 * Validate that the input register is one of the general purpose
3633 * registers.
3634 */
3635 int nft_validate_input_register(enum nft_registers reg)
3636 {
3637 if (reg <= NFT_REG_VERDICT)
3638 return -EINVAL;
3639 if (reg > NFT_REG_MAX)
3640 return -ERANGE;
3641 return 0;
3642 }
3643 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3644
3645 /**
3646 * nft_validate_output_register - validate an expressions' output register
3647 *
3648 * @reg: the register number
3649 *
3650 * Validate that the output register is one of the general purpose
3651 * registers or the verdict register.
3652 */
3653 int nft_validate_output_register(enum nft_registers reg)
3654 {
3655 if (reg < NFT_REG_VERDICT)
3656 return -EINVAL;
3657 if (reg > NFT_REG_MAX)
3658 return -ERANGE;
3659 return 0;
3660 }
3661 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3662
3663 /**
3664 * nft_validate_data_load - validate an expressions' data load
3665 *
3666 * @ctx: context of the expression performing the load
3667 * @reg: the destination register number
3668 * @data: the data to load
3669 * @type: the data type
3670 *
3671 * Validate that a data load uses the appropriate data type for
3672 * the destination register. A value of NULL for the data means
3673 * that its runtime gathered data, which is always of type
3674 * NFT_DATA_VALUE.
3675 */
3676 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3677 const struct nft_data *data,
3678 enum nft_data_types type)
3679 {
3680 int err;
3681
3682 switch (reg) {
3683 case NFT_REG_VERDICT:
3684 if (data == NULL || type != NFT_DATA_VERDICT)
3685 return -EINVAL;
3686
3687 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3688 err = nf_tables_check_loops(ctx, data->chain);
3689 if (err < 0)
3690 return err;
3691
3692 if (ctx->chain->level + 1 > data->chain->level) {
3693 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3694 return -EMLINK;
3695 data->chain->level = ctx->chain->level + 1;
3696 }
3697 }
3698
3699 return 0;
3700 default:
3701 if (data != NULL && type != NFT_DATA_VALUE)
3702 return -EINVAL;
3703 return 0;
3704 }
3705 }
3706 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3707
3708 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3709 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3710 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3711 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3712 };
3713
3714 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3715 struct nft_data_desc *desc, const struct nlattr *nla)
3716 {
3717 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3718 struct nft_chain *chain;
3719 int err;
3720
3721 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3722 if (err < 0)
3723 return err;
3724
3725 if (!tb[NFTA_VERDICT_CODE])
3726 return -EINVAL;
3727 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3728
3729 switch (data->verdict) {
3730 default:
3731 switch (data->verdict & NF_VERDICT_MASK) {
3732 case NF_ACCEPT:
3733 case NF_DROP:
3734 case NF_QUEUE:
3735 break;
3736 default:
3737 return -EINVAL;
3738 }
3739 /* fall through */
3740 case NFT_CONTINUE:
3741 case NFT_BREAK:
3742 case NFT_RETURN:
3743 desc->len = sizeof(data->verdict);
3744 break;
3745 case NFT_JUMP:
3746 case NFT_GOTO:
3747 if (!tb[NFTA_VERDICT_CHAIN])
3748 return -EINVAL;
3749 chain = nf_tables_chain_lookup(ctx->table,
3750 tb[NFTA_VERDICT_CHAIN]);
3751 if (IS_ERR(chain))
3752 return PTR_ERR(chain);
3753 if (chain->flags & NFT_BASE_CHAIN)
3754 return -EOPNOTSUPP;
3755
3756 chain->use++;
3757 data->chain = chain;
3758 desc->len = sizeof(data);
3759 break;
3760 }
3761
3762 desc->type = NFT_DATA_VERDICT;
3763 return 0;
3764 }
3765
3766 static void nft_verdict_uninit(const struct nft_data *data)
3767 {
3768 switch (data->verdict) {
3769 case NFT_JUMP:
3770 case NFT_GOTO:
3771 data->chain->use--;
3772 break;
3773 }
3774 }
3775
3776 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3777 {
3778 struct nlattr *nest;
3779
3780 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3781 if (!nest)
3782 goto nla_put_failure;
3783
3784 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3785 goto nla_put_failure;
3786
3787 switch (data->verdict) {
3788 case NFT_JUMP:
3789 case NFT_GOTO:
3790 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3791 goto nla_put_failure;
3792 }
3793 nla_nest_end(skb, nest);
3794 return 0;
3795
3796 nla_put_failure:
3797 return -1;
3798 }
3799
3800 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3801 struct nft_data_desc *desc, const struct nlattr *nla)
3802 {
3803 unsigned int len;
3804
3805 len = nla_len(nla);
3806 if (len == 0)
3807 return -EINVAL;
3808 if (len > sizeof(data->data))
3809 return -EOVERFLOW;
3810
3811 nla_memcpy(data->data, nla, sizeof(data->data));
3812 desc->type = NFT_DATA_VALUE;
3813 desc->len = len;
3814 return 0;
3815 }
3816
3817 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3818 unsigned int len)
3819 {
3820 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3821 }
3822
3823 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3824 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3825 .len = FIELD_SIZEOF(struct nft_data, data) },
3826 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3827 };
3828
3829 /**
3830 * nft_data_init - parse nf_tables data netlink attributes
3831 *
3832 * @ctx: context of the expression using the data
3833 * @data: destination struct nft_data
3834 * @desc: data description
3835 * @nla: netlink attribute containing data
3836 *
3837 * Parse the netlink data attributes and initialize a struct nft_data.
3838 * The type and length of data are returned in the data description.
3839 *
3840 * The caller can indicate that it only wants to accept data of type
3841 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3842 */
3843 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3844 struct nft_data_desc *desc, const struct nlattr *nla)
3845 {
3846 struct nlattr *tb[NFTA_DATA_MAX + 1];
3847 int err;
3848
3849 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3850 if (err < 0)
3851 return err;
3852
3853 if (tb[NFTA_DATA_VALUE])
3854 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3855 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3856 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3857 return -EINVAL;
3858 }
3859 EXPORT_SYMBOL_GPL(nft_data_init);
3860
3861 /**
3862 * nft_data_uninit - release a nft_data item
3863 *
3864 * @data: struct nft_data to release
3865 * @type: type of data
3866 *
3867 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3868 * all others need to be released by calling this function.
3869 */
3870 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3871 {
3872 switch (type) {
3873 case NFT_DATA_VALUE:
3874 return;
3875 case NFT_DATA_VERDICT:
3876 return nft_verdict_uninit(data);
3877 default:
3878 WARN_ON(1);
3879 }
3880 }
3881 EXPORT_SYMBOL_GPL(nft_data_uninit);
3882
3883 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3884 enum nft_data_types type, unsigned int len)
3885 {
3886 struct nlattr *nest;
3887 int err;
3888
3889 nest = nla_nest_start(skb, attr);
3890 if (nest == NULL)
3891 return -1;
3892
3893 switch (type) {
3894 case NFT_DATA_VALUE:
3895 err = nft_value_dump(skb, data, len);
3896 break;
3897 case NFT_DATA_VERDICT:
3898 err = nft_verdict_dump(skb, data);
3899 break;
3900 default:
3901 err = -EINVAL;
3902 WARN_ON(1);
3903 }
3904
3905 nla_nest_end(skb, nest);
3906 return err;
3907 }
3908 EXPORT_SYMBOL_GPL(nft_data_dump);
3909
3910 static int nf_tables_init_net(struct net *net)
3911 {
3912 INIT_LIST_HEAD(&net->nft.af_info);
3913 INIT_LIST_HEAD(&net->nft.commit_list);
3914 net->nft.base_seq = 1;
3915 return 0;
3916 }
3917
3918 static struct pernet_operations nf_tables_net_ops = {
3919 .init = nf_tables_init_net,
3920 };
3921
3922 static int __init nf_tables_module_init(void)
3923 {
3924 int err;
3925
3926 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
3927 GFP_KERNEL);
3928 if (info == NULL) {
3929 err = -ENOMEM;
3930 goto err1;
3931 }
3932
3933 err = nf_tables_core_module_init();
3934 if (err < 0)
3935 goto err2;
3936
3937 err = nfnetlink_subsys_register(&nf_tables_subsys);
3938 if (err < 0)
3939 goto err3;
3940
3941 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
3942 return register_pernet_subsys(&nf_tables_net_ops);
3943 err3:
3944 nf_tables_core_module_exit();
3945 err2:
3946 kfree(info);
3947 err1:
3948 return err;
3949 }
3950
3951 static void __exit nf_tables_module_exit(void)
3952 {
3953 unregister_pernet_subsys(&nf_tables_net_ops);
3954 nfnetlink_subsys_unregister(&nf_tables_subsys);
3955 nf_tables_core_module_exit();
3956 kfree(info);
3957 }
3958
3959 module_init(nf_tables_module_init);
3960 module_exit(nf_tables_module_exit);
3961
3962 MODULE_LICENSE("GPL");
3963 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
3964 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux kernel - Deliverables
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