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netfilter: nf_tables: Avoid duplicate call to nft_data_uninit() for same key
[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_table(struct nft_ctx *ctx, struct sk_buff *skb,
2251 struct netlink_callback *cb)
2252 {
2253 const struct nft_set *set;
2254 unsigned int idx = 0, s_idx = cb->args[0];
2255
2256 if (cb->args[1])
2257 return skb->len;
2258
2259 rcu_read_lock();
2260 cb->seq = ctx->net->nft.base_seq;
2261
2262 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2263 if (idx < s_idx)
2264 goto cont;
2265 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2266 NLM_F_MULTI) < 0) {
2267 cb->args[0] = idx;
2268 goto done;
2269 }
2270 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2271 cont:
2272 idx++;
2273 }
2274 cb->args[1] = 1;
2275 done:
2276 rcu_read_unlock();
2277 return skb->len;
2278 }
2279
2280 static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
2281 struct netlink_callback *cb)
2282 {
2283 const struct nft_set *set;
2284 unsigned int idx, s_idx = cb->args[0];
2285 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2286
2287 if (cb->args[1])
2288 return skb->len;
2289
2290 rcu_read_lock();
2291 cb->seq = ctx->net->nft.base_seq;
2292
2293 list_for_each_entry_rcu(table, &ctx->afi->tables, list) {
2294 if (cur_table) {
2295 if (cur_table != table)
2296 continue;
2297
2298 cur_table = NULL;
2299 }
2300 ctx->table = table;
2301 idx = 0;
2302 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2303 if (idx < s_idx)
2304 goto cont;
2305 if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET,
2306 NLM_F_MULTI) < 0) {
2307 cb->args[0] = idx;
2308 cb->args[2] = (unsigned long) table;
2309 goto done;
2310 }
2311 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2312 cont:
2313 idx++;
2314 }
2315 }
2316 cb->args[1] = 1;
2317 done:
2318 rcu_read_unlock();
2319 return skb->len;
2320 }
2321
2322 static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
2323 struct netlink_callback *cb)
2324 {
2325 const struct nft_set *set;
2326 unsigned int idx, s_idx = cb->args[0];
2327 struct nft_af_info *afi;
2328 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
2329 struct net *net = sock_net(skb->sk);
2330 int cur_family = cb->args[3];
2331
2332 if (cb->args[1])
2333 return skb->len;
2334
2335 rcu_read_lock();
2336 cb->seq = net->nft.base_seq;
2337
2338 list_for_each_entry_rcu(afi, &net->nft.af_info, list) {
2339 if (cur_family) {
2340 if (afi->family != cur_family)
2341 continue;
2342
2343 cur_family = 0;
2344 }
2345
2346 list_for_each_entry_rcu(table, &afi->tables, list) {
2347 if (cur_table) {
2348 if (cur_table != table)
2349 continue;
2350
2351 cur_table = NULL;
2352 }
2353
2354 ctx->table = table;
2355 ctx->afi = afi;
2356 idx = 0;
2357 list_for_each_entry_rcu(set, &ctx->table->sets, list) {
2358 if (idx < s_idx)
2359 goto cont;
2360 if (nf_tables_fill_set(skb, ctx, set,
2361 NFT_MSG_NEWSET,
2362 NLM_F_MULTI) < 0) {
2363 cb->args[0] = idx;
2364 cb->args[2] = (unsigned long) table;
2365 cb->args[3] = afi->family;
2366 goto done;
2367 }
2368 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2369 cont:
2370 idx++;
2371 }
2372 if (s_idx)
2373 s_idx = 0;
2374 }
2375 }
2376 cb->args[1] = 1;
2377 done:
2378 rcu_read_unlock();
2379 return skb->len;
2380 }
2381
2382 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
2383 {
2384 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2385 struct nlattr *nla[NFTA_SET_MAX + 1];
2386 struct nft_ctx ctx;
2387 int err, ret;
2388
2389 err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX,
2390 nft_set_policy);
2391 if (err < 0)
2392 return err;
2393
2394 err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla);
2395 if (err < 0)
2396 return err;
2397
2398 if (ctx.table == NULL) {
2399 if (ctx.afi == NULL)
2400 ret = nf_tables_dump_sets_all(&ctx, skb, cb);
2401 else
2402 ret = nf_tables_dump_sets_family(&ctx, skb, cb);
2403 } else
2404 ret = nf_tables_dump_sets_table(&ctx, skb, cb);
2405
2406 return ret;
2407 }
2408
2409 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2410
2411 static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
2412 const struct nlmsghdr *nlh,
2413 const struct nlattr * const nla[])
2414 {
2415 const struct nft_set *set;
2416 struct nft_ctx ctx;
2417 struct sk_buff *skb2;
2418 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2419 int err;
2420
2421 /* Verify existance before starting dump */
2422 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2423 if (err < 0)
2424 return err;
2425
2426 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2427 struct netlink_dump_control c = {
2428 .dump = nf_tables_dump_sets,
2429 };
2430 return netlink_dump_start(nlsk, skb, nlh, &c);
2431 }
2432
2433 /* Only accept unspec with dump */
2434 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2435 return -EAFNOSUPPORT;
2436
2437 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2438 if (IS_ERR(set))
2439 return PTR_ERR(set);
2440 if (set->flags & NFT_SET_INACTIVE)
2441 return -ENOENT;
2442
2443 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2444 if (skb2 == NULL)
2445 return -ENOMEM;
2446
2447 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
2448 if (err < 0)
2449 goto err;
2450
2451 return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid);
2452
2453 err:
2454 kfree_skb(skb2);
2455 return err;
2456 }
2457
2458 static int nf_tables_set_desc_parse(const struct nft_ctx *ctx,
2459 struct nft_set_desc *desc,
2460 const struct nlattr *nla)
2461 {
2462 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
2463 int err;
2464
2465 err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy);
2466 if (err < 0)
2467 return err;
2468
2469 if (da[NFTA_SET_DESC_SIZE] != NULL)
2470 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
2471
2472 return 0;
2473 }
2474
2475 static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type,
2476 struct nft_set *set)
2477 {
2478 struct nft_trans *trans;
2479
2480 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
2481 if (trans == NULL)
2482 return -ENOMEM;
2483
2484 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
2485 nft_trans_set_id(trans) =
2486 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
2487 set->flags |= NFT_SET_INACTIVE;
2488 }
2489 nft_trans_set(trans) = set;
2490 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2491
2492 return 0;
2493 }
2494
2495 static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb,
2496 const struct nlmsghdr *nlh,
2497 const struct nlattr * const nla[])
2498 {
2499 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2500 const struct nft_set_ops *ops;
2501 struct nft_af_info *afi;
2502 struct net *net = sock_net(skb->sk);
2503 struct nft_table *table;
2504 struct nft_set *set;
2505 struct nft_ctx ctx;
2506 char name[IFNAMSIZ];
2507 unsigned int size;
2508 bool create;
2509 u32 ktype, dtype, flags, policy;
2510 struct nft_set_desc desc;
2511 int err;
2512
2513 if (nla[NFTA_SET_TABLE] == NULL ||
2514 nla[NFTA_SET_NAME] == NULL ||
2515 nla[NFTA_SET_KEY_LEN] == NULL ||
2516 nla[NFTA_SET_ID] == NULL)
2517 return -EINVAL;
2518
2519 memset(&desc, 0, sizeof(desc));
2520
2521 ktype = NFT_DATA_VALUE;
2522 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
2523 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
2524 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
2525 return -EINVAL;
2526 }
2527
2528 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
2529 if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data))
2530 return -EINVAL;
2531
2532 flags = 0;
2533 if (nla[NFTA_SET_FLAGS] != NULL) {
2534 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
2535 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
2536 NFT_SET_INTERVAL | NFT_SET_MAP))
2537 return -EINVAL;
2538 }
2539
2540 dtype = 0;
2541 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
2542 if (!(flags & NFT_SET_MAP))
2543 return -EINVAL;
2544
2545 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
2546 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
2547 dtype != NFT_DATA_VERDICT)
2548 return -EINVAL;
2549
2550 if (dtype != NFT_DATA_VERDICT) {
2551 if (nla[NFTA_SET_DATA_LEN] == NULL)
2552 return -EINVAL;
2553 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
2554 if (desc.dlen == 0 ||
2555 desc.dlen > FIELD_SIZEOF(struct nft_data, data))
2556 return -EINVAL;
2557 } else
2558 desc.dlen = sizeof(struct nft_data);
2559 } else if (flags & NFT_SET_MAP)
2560 return -EINVAL;
2561
2562 policy = NFT_SET_POL_PERFORMANCE;
2563 if (nla[NFTA_SET_POLICY] != NULL)
2564 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
2565
2566 if (nla[NFTA_SET_DESC] != NULL) {
2567 err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]);
2568 if (err < 0)
2569 return err;
2570 }
2571
2572 create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false;
2573
2574 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create);
2575 if (IS_ERR(afi))
2576 return PTR_ERR(afi);
2577
2578 table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
2579 if (IS_ERR(table))
2580 return PTR_ERR(table);
2581
2582 nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
2583
2584 set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
2585 if (IS_ERR(set)) {
2586 if (PTR_ERR(set) != -ENOENT)
2587 return PTR_ERR(set);
2588 set = NULL;
2589 }
2590
2591 if (set != NULL) {
2592 if (nlh->nlmsg_flags & NLM_F_EXCL)
2593 return -EEXIST;
2594 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2595 return -EOPNOTSUPP;
2596 return 0;
2597 }
2598
2599 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
2600 return -ENOENT;
2601
2602 ops = nft_select_set_ops(nla, &desc, policy);
2603 if (IS_ERR(ops))
2604 return PTR_ERR(ops);
2605
2606 size = 0;
2607 if (ops->privsize != NULL)
2608 size = ops->privsize(nla);
2609
2610 err = -ENOMEM;
2611 set = kzalloc(sizeof(*set) + size, GFP_KERNEL);
2612 if (set == NULL)
2613 goto err1;
2614
2615 nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name));
2616 err = nf_tables_set_alloc_name(&ctx, set, name);
2617 if (err < 0)
2618 goto err2;
2619
2620 INIT_LIST_HEAD(&set->bindings);
2621 set->ops = ops;
2622 set->ktype = ktype;
2623 set->klen = desc.klen;
2624 set->dtype = dtype;
2625 set->dlen = desc.dlen;
2626 set->flags = flags;
2627 set->size = desc.size;
2628
2629 err = ops->init(set, &desc, nla);
2630 if (err < 0)
2631 goto err2;
2632
2633 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
2634 if (err < 0)
2635 goto err2;
2636
2637 list_add_tail_rcu(&set->list, &table->sets);
2638 table->use++;
2639 return 0;
2640
2641 err2:
2642 kfree(set);
2643 err1:
2644 module_put(ops->owner);
2645 return err;
2646 }
2647
2648 static void nft_set_destroy(struct nft_set *set)
2649 {
2650 set->ops->destroy(set);
2651 module_put(set->ops->owner);
2652 kfree(set);
2653 }
2654
2655 static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
2656 {
2657 list_del_rcu(&set->list);
2658 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC);
2659 nft_set_destroy(set);
2660 }
2661
2662 static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
2663 const struct nlmsghdr *nlh,
2664 const struct nlattr * const nla[])
2665 {
2666 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2667 struct nft_set *set;
2668 struct nft_ctx ctx;
2669 int err;
2670
2671 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
2672 return -EAFNOSUPPORT;
2673 if (nla[NFTA_SET_TABLE] == NULL)
2674 return -EINVAL;
2675
2676 err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla);
2677 if (err < 0)
2678 return err;
2679
2680 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
2681 if (IS_ERR(set))
2682 return PTR_ERR(set);
2683 if (set->flags & NFT_SET_INACTIVE)
2684 return -ENOENT;
2685 if (!list_empty(&set->bindings))
2686 return -EBUSY;
2687
2688 err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set);
2689 if (err < 0)
2690 return err;
2691
2692 list_del_rcu(&set->list);
2693 ctx.table->use--;
2694 return 0;
2695 }
2696
2697 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
2698 const struct nft_set *set,
2699 const struct nft_set_iter *iter,
2700 const struct nft_set_elem *elem)
2701 {
2702 enum nft_registers dreg;
2703
2704 dreg = nft_type_to_reg(set->dtype);
2705 return nft_validate_data_load(ctx, dreg, &elem->data,
2706 set->dtype == NFT_DATA_VERDICT ?
2707 NFT_DATA_VERDICT : NFT_DATA_VALUE);
2708 }
2709
2710 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
2711 struct nft_set_binding *binding)
2712 {
2713 struct nft_set_binding *i;
2714 struct nft_set_iter iter;
2715
2716 if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS)
2717 return -EBUSY;
2718
2719 if (set->flags & NFT_SET_MAP) {
2720 /* If the set is already bound to the same chain all
2721 * jumps are already validated for that chain.
2722 */
2723 list_for_each_entry(i, &set->bindings, list) {
2724 if (i->chain == binding->chain)
2725 goto bind;
2726 }
2727
2728 iter.skip = 0;
2729 iter.count = 0;
2730 iter.err = 0;
2731 iter.fn = nf_tables_bind_check_setelem;
2732
2733 set->ops->walk(ctx, set, &iter);
2734 if (iter.err < 0) {
2735 /* Destroy anonymous sets if binding fails */
2736 if (set->flags & NFT_SET_ANONYMOUS)
2737 nf_tables_set_destroy(ctx, set);
2738
2739 return iter.err;
2740 }
2741 }
2742 bind:
2743 binding->chain = ctx->chain;
2744 list_add_tail_rcu(&binding->list, &set->bindings);
2745 return 0;
2746 }
2747
2748 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
2749 struct nft_set_binding *binding)
2750 {
2751 list_del_rcu(&binding->list);
2752
2753 if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS &&
2754 !(set->flags & NFT_SET_INACTIVE))
2755 nf_tables_set_destroy(ctx, set);
2756 }
2757
2758 /*
2759 * Set elements
2760 */
2761
2762 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
2763 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
2764 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
2765 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
2766 };
2767
2768 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
2769 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING },
2770 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING },
2771 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
2772 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
2773 };
2774
2775 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx,
2776 const struct sk_buff *skb,
2777 const struct nlmsghdr *nlh,
2778 const struct nlattr * const nla[],
2779 bool trans)
2780 {
2781 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2782 struct nft_af_info *afi;
2783 struct nft_table *table;
2784 struct net *net = sock_net(skb->sk);
2785
2786 afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
2787 if (IS_ERR(afi))
2788 return PTR_ERR(afi);
2789
2790 table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]);
2791 if (IS_ERR(table))
2792 return PTR_ERR(table);
2793 if (!trans && (table->flags & NFT_TABLE_INACTIVE))
2794 return -ENOENT;
2795
2796 nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
2797 return 0;
2798 }
2799
2800 static int nf_tables_fill_setelem(struct sk_buff *skb,
2801 const struct nft_set *set,
2802 const struct nft_set_elem *elem)
2803 {
2804 unsigned char *b = skb_tail_pointer(skb);
2805 struct nlattr *nest;
2806
2807 nest = nla_nest_start(skb, NFTA_LIST_ELEM);
2808 if (nest == NULL)
2809 goto nla_put_failure;
2810
2811 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE,
2812 set->klen) < 0)
2813 goto nla_put_failure;
2814
2815 if (set->flags & NFT_SET_MAP &&
2816 !(elem->flags & NFT_SET_ELEM_INTERVAL_END) &&
2817 nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data,
2818 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
2819 set->dlen) < 0)
2820 goto nla_put_failure;
2821
2822 if (elem->flags != 0)
2823 if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags)))
2824 goto nla_put_failure;
2825
2826 nla_nest_end(skb, nest);
2827 return 0;
2828
2829 nla_put_failure:
2830 nlmsg_trim(skb, b);
2831 return -EMSGSIZE;
2832 }
2833
2834 struct nft_set_dump_args {
2835 const struct netlink_callback *cb;
2836 struct nft_set_iter iter;
2837 struct sk_buff *skb;
2838 };
2839
2840 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
2841 const struct nft_set *set,
2842 const struct nft_set_iter *iter,
2843 const struct nft_set_elem *elem)
2844 {
2845 struct nft_set_dump_args *args;
2846
2847 args = container_of(iter, struct nft_set_dump_args, iter);
2848 return nf_tables_fill_setelem(args->skb, set, elem);
2849 }
2850
2851 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
2852 {
2853 const struct nft_set *set;
2854 struct nft_set_dump_args args;
2855 struct nft_ctx ctx;
2856 struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1];
2857 struct nfgenmsg *nfmsg;
2858 struct nlmsghdr *nlh;
2859 struct nlattr *nest;
2860 u32 portid, seq;
2861 int event, err;
2862
2863 err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla,
2864 NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy);
2865 if (err < 0)
2866 return err;
2867
2868 err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla,
2869 false);
2870 if (err < 0)
2871 return err;
2872
2873 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2874 if (IS_ERR(set))
2875 return PTR_ERR(set);
2876 if (set->flags & NFT_SET_INACTIVE)
2877 return -ENOENT;
2878
2879 event = NFT_MSG_NEWSETELEM;
2880 event |= NFNL_SUBSYS_NFTABLES << 8;
2881 portid = NETLINK_CB(cb->skb).portid;
2882 seq = cb->nlh->nlmsg_seq;
2883
2884 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2885 NLM_F_MULTI);
2886 if (nlh == NULL)
2887 goto nla_put_failure;
2888
2889 nfmsg = nlmsg_data(nlh);
2890 nfmsg->nfgen_family = ctx.afi->family;
2891 nfmsg->version = NFNETLINK_V0;
2892 nfmsg->res_id = 0;
2893
2894 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name))
2895 goto nla_put_failure;
2896 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
2897 goto nla_put_failure;
2898
2899 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2900 if (nest == NULL)
2901 goto nla_put_failure;
2902
2903 args.cb = cb;
2904 args.skb = skb;
2905 args.iter.skip = cb->args[0];
2906 args.iter.count = 0;
2907 args.iter.err = 0;
2908 args.iter.fn = nf_tables_dump_setelem;
2909 set->ops->walk(&ctx, set, &args.iter);
2910
2911 nla_nest_end(skb, nest);
2912 nlmsg_end(skb, nlh);
2913
2914 if (args.iter.err && args.iter.err != -EMSGSIZE)
2915 return args.iter.err;
2916 if (args.iter.count == cb->args[0])
2917 return 0;
2918
2919 cb->args[0] = args.iter.count;
2920 return skb->len;
2921
2922 nla_put_failure:
2923 return -ENOSPC;
2924 }
2925
2926 static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
2927 const struct nlmsghdr *nlh,
2928 const struct nlattr * const nla[])
2929 {
2930 const struct nft_set *set;
2931 struct nft_ctx ctx;
2932 int err;
2933
2934 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
2935 if (err < 0)
2936 return err;
2937
2938 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
2939 if (IS_ERR(set))
2940 return PTR_ERR(set);
2941 if (set->flags & NFT_SET_INACTIVE)
2942 return -ENOENT;
2943
2944 if (nlh->nlmsg_flags & NLM_F_DUMP) {
2945 struct netlink_dump_control c = {
2946 .dump = nf_tables_dump_set,
2947 };
2948 return netlink_dump_start(nlsk, skb, nlh, &c);
2949 }
2950 return -EOPNOTSUPP;
2951 }
2952
2953 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
2954 const struct nft_ctx *ctx, u32 seq,
2955 u32 portid, int event, u16 flags,
2956 const struct nft_set *set,
2957 const struct nft_set_elem *elem)
2958 {
2959 struct nfgenmsg *nfmsg;
2960 struct nlmsghdr *nlh;
2961 struct nlattr *nest;
2962 int err;
2963
2964 event |= NFNL_SUBSYS_NFTABLES << 8;
2965 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
2966 flags);
2967 if (nlh == NULL)
2968 goto nla_put_failure;
2969
2970 nfmsg = nlmsg_data(nlh);
2971 nfmsg->nfgen_family = ctx->afi->family;
2972 nfmsg->version = NFNETLINK_V0;
2973 nfmsg->res_id = 0;
2974
2975 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
2976 goto nla_put_failure;
2977 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
2978 goto nla_put_failure;
2979
2980 nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
2981 if (nest == NULL)
2982 goto nla_put_failure;
2983
2984 err = nf_tables_fill_setelem(skb, set, elem);
2985 if (err < 0)
2986 goto nla_put_failure;
2987
2988 nla_nest_end(skb, nest);
2989
2990 return nlmsg_end(skb, nlh);
2991
2992 nla_put_failure:
2993 nlmsg_trim(skb, nlh);
2994 return -1;
2995 }
2996
2997 static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
2998 const struct nft_set *set,
2999 const struct nft_set_elem *elem,
3000 int event, u16 flags)
3001 {
3002 struct net *net = ctx->net;
3003 u32 portid = ctx->portid;
3004 struct sk_buff *skb;
3005 int err;
3006
3007 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
3008 return 0;
3009
3010 err = -ENOBUFS;
3011 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3012 if (skb == NULL)
3013 goto err;
3014
3015 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
3016 set, elem);
3017 if (err < 0) {
3018 kfree_skb(skb);
3019 goto err;
3020 }
3021
3022 err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
3023 GFP_KERNEL);
3024 err:
3025 if (err < 0)
3026 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
3027 return err;
3028 }
3029
3030 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
3031 int msg_type,
3032 struct nft_set *set)
3033 {
3034 struct nft_trans *trans;
3035
3036 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
3037 if (trans == NULL)
3038 return NULL;
3039
3040 nft_trans_elem_set(trans) = set;
3041 return trans;
3042 }
3043
3044 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
3045 const struct nlattr *attr)
3046 {
3047 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3048 struct nft_data_desc d1, d2;
3049 struct nft_set_elem elem;
3050 struct nft_set_binding *binding;
3051 enum nft_registers dreg;
3052 struct nft_trans *trans;
3053 int err;
3054
3055 if (set->size && set->nelems == set->size)
3056 return -ENFILE;
3057
3058 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3059 nft_set_elem_policy);
3060 if (err < 0)
3061 return err;
3062
3063 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3064 return -EINVAL;
3065
3066 elem.flags = 0;
3067 if (nla[NFTA_SET_ELEM_FLAGS] != NULL) {
3068 elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
3069 if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
3070 return -EINVAL;
3071 }
3072
3073 if (set->flags & NFT_SET_MAP) {
3074 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
3075 !(elem.flags & NFT_SET_ELEM_INTERVAL_END))
3076 return -EINVAL;
3077 if (nla[NFTA_SET_ELEM_DATA] != NULL &&
3078 elem.flags & NFT_SET_ELEM_INTERVAL_END)
3079 return -EINVAL;
3080 } else {
3081 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3082 return -EINVAL;
3083 }
3084
3085 err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]);
3086 if (err < 0)
3087 goto err1;
3088 err = -EINVAL;
3089 if (d1.type != NFT_DATA_VALUE || d1.len != set->klen)
3090 goto err2;
3091
3092 err = -EEXIST;
3093 if (set->ops->get(set, &elem) == 0)
3094 goto err2;
3095
3096 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
3097 err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]);
3098 if (err < 0)
3099 goto err2;
3100
3101 err = -EINVAL;
3102 if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen)
3103 goto err3;
3104
3105 dreg = nft_type_to_reg(set->dtype);
3106 list_for_each_entry(binding, &set->bindings, list) {
3107 struct nft_ctx bind_ctx = {
3108 .afi = ctx->afi,
3109 .table = ctx->table,
3110 .chain = (struct nft_chain *)binding->chain,
3111 };
3112
3113 err = nft_validate_data_load(&bind_ctx, dreg,
3114 &elem.data, d2.type);
3115 if (err < 0)
3116 goto err3;
3117 }
3118 }
3119
3120 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
3121 if (trans == NULL)
3122 goto err3;
3123
3124 err = set->ops->insert(set, &elem);
3125 if (err < 0)
3126 goto err4;
3127
3128 nft_trans_elem(trans) = elem;
3129 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3130 return 0;
3131
3132 err4:
3133 kfree(trans);
3134 err3:
3135 if (nla[NFTA_SET_ELEM_DATA] != NULL)
3136 nft_data_uninit(&elem.data, d2.type);
3137 err2:
3138 nft_data_uninit(&elem.key, d1.type);
3139 err1:
3140 return err;
3141 }
3142
3143 static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb,
3144 const struct nlmsghdr *nlh,
3145 const struct nlattr * const nla[])
3146 {
3147 struct net *net = sock_net(skb->sk);
3148 const struct nlattr *attr;
3149 struct nft_set *set;
3150 struct nft_ctx ctx;
3151 int rem, err = 0;
3152
3153 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true);
3154 if (err < 0)
3155 return err;
3156
3157 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3158 if (IS_ERR(set)) {
3159 if (nla[NFTA_SET_ELEM_LIST_SET_ID]) {
3160 set = nf_tables_set_lookup_byid(net,
3161 nla[NFTA_SET_ELEM_LIST_SET_ID]);
3162 }
3163 if (IS_ERR(set))
3164 return PTR_ERR(set);
3165 }
3166
3167 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3168 return -EBUSY;
3169
3170 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3171 err = nft_add_set_elem(&ctx, set, attr);
3172 if (err < 0)
3173 break;
3174
3175 set->nelems++;
3176 }
3177 return err;
3178 }
3179
3180 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
3181 const struct nlattr *attr)
3182 {
3183 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
3184 struct nft_data_desc desc;
3185 struct nft_set_elem elem;
3186 struct nft_trans *trans;
3187 int err;
3188
3189 err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr,
3190 nft_set_elem_policy);
3191 if (err < 0)
3192 goto err1;
3193
3194 err = -EINVAL;
3195 if (nla[NFTA_SET_ELEM_KEY] == NULL)
3196 goto err1;
3197
3198 err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]);
3199 if (err < 0)
3200 goto err1;
3201
3202 err = -EINVAL;
3203 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
3204 goto err2;
3205
3206 err = set->ops->get(set, &elem);
3207 if (err < 0)
3208 goto err2;
3209
3210 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
3211 if (trans == NULL)
3212 goto err2;
3213
3214 nft_trans_elem(trans) = elem;
3215 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
3216
3217 nft_data_uninit(&elem.key, NFT_DATA_VALUE);
3218 if (set->flags & NFT_SET_MAP)
3219 nft_data_uninit(&elem.data, set->dtype);
3220
3221 return 0;
3222 err2:
3223 nft_data_uninit(&elem.key, desc.type);
3224 err1:
3225 return err;
3226 }
3227
3228 static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb,
3229 const struct nlmsghdr *nlh,
3230 const struct nlattr * const nla[])
3231 {
3232 const struct nlattr *attr;
3233 struct nft_set *set;
3234 struct nft_ctx ctx;
3235 int rem, err = 0;
3236
3237 err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false);
3238 if (err < 0)
3239 return err;
3240
3241 set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]);
3242 if (IS_ERR(set))
3243 return PTR_ERR(set);
3244 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
3245 return -EBUSY;
3246
3247 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
3248 err = nft_del_setelem(&ctx, set, attr);
3249 if (err < 0)
3250 break;
3251
3252 set->nelems--;
3253 }
3254 return err;
3255 }
3256
3257 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
3258 [NFT_MSG_NEWTABLE] = {
3259 .call_batch = nf_tables_newtable,
3260 .attr_count = NFTA_TABLE_MAX,
3261 .policy = nft_table_policy,
3262 },
3263 [NFT_MSG_GETTABLE] = {
3264 .call = nf_tables_gettable,
3265 .attr_count = NFTA_TABLE_MAX,
3266 .policy = nft_table_policy,
3267 },
3268 [NFT_MSG_DELTABLE] = {
3269 .call_batch = nf_tables_deltable,
3270 .attr_count = NFTA_TABLE_MAX,
3271 .policy = nft_table_policy,
3272 },
3273 [NFT_MSG_NEWCHAIN] = {
3274 .call_batch = nf_tables_newchain,
3275 .attr_count = NFTA_CHAIN_MAX,
3276 .policy = nft_chain_policy,
3277 },
3278 [NFT_MSG_GETCHAIN] = {
3279 .call = nf_tables_getchain,
3280 .attr_count = NFTA_CHAIN_MAX,
3281 .policy = nft_chain_policy,
3282 },
3283 [NFT_MSG_DELCHAIN] = {
3284 .call_batch = nf_tables_delchain,
3285 .attr_count = NFTA_CHAIN_MAX,
3286 .policy = nft_chain_policy,
3287 },
3288 [NFT_MSG_NEWRULE] = {
3289 .call_batch = nf_tables_newrule,
3290 .attr_count = NFTA_RULE_MAX,
3291 .policy = nft_rule_policy,
3292 },
3293 [NFT_MSG_GETRULE] = {
3294 .call = nf_tables_getrule,
3295 .attr_count = NFTA_RULE_MAX,
3296 .policy = nft_rule_policy,
3297 },
3298 [NFT_MSG_DELRULE] = {
3299 .call_batch = nf_tables_delrule,
3300 .attr_count = NFTA_RULE_MAX,
3301 .policy = nft_rule_policy,
3302 },
3303 [NFT_MSG_NEWSET] = {
3304 .call_batch = nf_tables_newset,
3305 .attr_count = NFTA_SET_MAX,
3306 .policy = nft_set_policy,
3307 },
3308 [NFT_MSG_GETSET] = {
3309 .call = nf_tables_getset,
3310 .attr_count = NFTA_SET_MAX,
3311 .policy = nft_set_policy,
3312 },
3313 [NFT_MSG_DELSET] = {
3314 .call_batch = nf_tables_delset,
3315 .attr_count = NFTA_SET_MAX,
3316 .policy = nft_set_policy,
3317 },
3318 [NFT_MSG_NEWSETELEM] = {
3319 .call_batch = nf_tables_newsetelem,
3320 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3321 .policy = nft_set_elem_list_policy,
3322 },
3323 [NFT_MSG_GETSETELEM] = {
3324 .call = nf_tables_getsetelem,
3325 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3326 .policy = nft_set_elem_list_policy,
3327 },
3328 [NFT_MSG_DELSETELEM] = {
3329 .call_batch = nf_tables_delsetelem,
3330 .attr_count = NFTA_SET_ELEM_LIST_MAX,
3331 .policy = nft_set_elem_list_policy,
3332 },
3333 };
3334
3335 static void nft_chain_commit_update(struct nft_trans *trans)
3336 {
3337 struct nft_base_chain *basechain;
3338
3339 if (nft_trans_chain_name(trans)[0])
3340 strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans));
3341
3342 if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN))
3343 return;
3344
3345 basechain = nft_base_chain(trans->ctx.chain);
3346 nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans));
3347
3348 switch (nft_trans_chain_policy(trans)) {
3349 case NF_DROP:
3350 case NF_ACCEPT:
3351 basechain->policy = nft_trans_chain_policy(trans);
3352 break;
3353 }
3354 }
3355
3356 /* Schedule objects for release via rcu to make sure no packets are accesing
3357 * removed rules.
3358 */
3359 static void nf_tables_commit_release_rcu(struct rcu_head *rt)
3360 {
3361 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3362
3363 switch (trans->msg_type) {
3364 case NFT_MSG_DELTABLE:
3365 nf_tables_table_destroy(&trans->ctx);
3366 break;
3367 case NFT_MSG_DELCHAIN:
3368 nf_tables_chain_destroy(trans->ctx.chain);
3369 break;
3370 case NFT_MSG_DELRULE:
3371 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3372 break;
3373 case NFT_MSG_DELSET:
3374 nft_set_destroy(nft_trans_set(trans));
3375 break;
3376 }
3377 kfree(trans);
3378 }
3379
3380 static int nf_tables_commit(struct sk_buff *skb)
3381 {
3382 struct net *net = sock_net(skb->sk);
3383 struct nft_trans *trans, *next;
3384 struct nft_set *set;
3385
3386 /* Bump generation counter, invalidate any dump in progress */
3387 while (++net->nft.base_seq == 0);
3388
3389 /* A new generation has just started */
3390 net->nft.gencursor = gencursor_next(net);
3391
3392 /* Make sure all packets have left the previous generation before
3393 * purging old rules.
3394 */
3395 synchronize_rcu();
3396
3397 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3398 switch (trans->msg_type) {
3399 case NFT_MSG_NEWTABLE:
3400 if (nft_trans_table_update(trans)) {
3401 if (!nft_trans_table_enable(trans)) {
3402 nf_tables_table_disable(trans->ctx.afi,
3403 trans->ctx.table);
3404 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3405 }
3406 } else {
3407 trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE;
3408 }
3409 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
3410 nft_trans_destroy(trans);
3411 break;
3412 case NFT_MSG_DELTABLE:
3413 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
3414 break;
3415 case NFT_MSG_NEWCHAIN:
3416 if (nft_trans_chain_update(trans))
3417 nft_chain_commit_update(trans);
3418 else
3419 trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE;
3420
3421 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
3422 nft_trans_destroy(trans);
3423 break;
3424 case NFT_MSG_DELCHAIN:
3425 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
3426 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3427 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3428 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3429 trans->ctx.afi->nops);
3430 }
3431 break;
3432 case NFT_MSG_NEWRULE:
3433 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3434 nf_tables_rule_notify(&trans->ctx,
3435 nft_trans_rule(trans),
3436 NFT_MSG_NEWRULE);
3437 nft_trans_destroy(trans);
3438 break;
3439 case NFT_MSG_DELRULE:
3440 list_del_rcu(&nft_trans_rule(trans)->list);
3441 nf_tables_rule_notify(&trans->ctx,
3442 nft_trans_rule(trans),
3443 NFT_MSG_DELRULE);
3444 break;
3445 case NFT_MSG_NEWSET:
3446 nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE;
3447 /* This avoids hitting -EBUSY when deleting the table
3448 * from the transaction.
3449 */
3450 if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS &&
3451 !list_empty(&nft_trans_set(trans)->bindings))
3452 trans->ctx.table->use--;
3453
3454 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3455 NFT_MSG_NEWSET, GFP_KERNEL);
3456 nft_trans_destroy(trans);
3457 break;
3458 case NFT_MSG_DELSET:
3459 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
3460 NFT_MSG_DELSET, GFP_KERNEL);
3461 break;
3462 case NFT_MSG_NEWSETELEM:
3463 nf_tables_setelem_notify(&trans->ctx,
3464 nft_trans_elem_set(trans),
3465 &nft_trans_elem(trans),
3466 NFT_MSG_NEWSETELEM, 0);
3467 nft_trans_destroy(trans);
3468 break;
3469 case NFT_MSG_DELSETELEM:
3470 nf_tables_setelem_notify(&trans->ctx,
3471 nft_trans_elem_set(trans),
3472 &nft_trans_elem(trans),
3473 NFT_MSG_DELSETELEM, 0);
3474 set = nft_trans_elem_set(trans);
3475 set->ops->get(set, &nft_trans_elem(trans));
3476 set->ops->remove(set, &nft_trans_elem(trans));
3477 nft_trans_destroy(trans);
3478 break;
3479 }
3480 }
3481
3482 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3483 list_del(&trans->list);
3484 trans->ctx.nla = NULL;
3485 call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu);
3486 }
3487
3488 return 0;
3489 }
3490
3491 /* Schedule objects for release via rcu to make sure no packets are accesing
3492 * aborted rules.
3493 */
3494 static void nf_tables_abort_release_rcu(struct rcu_head *rt)
3495 {
3496 struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head);
3497
3498 switch (trans->msg_type) {
3499 case NFT_MSG_NEWTABLE:
3500 nf_tables_table_destroy(&trans->ctx);
3501 break;
3502 case NFT_MSG_NEWCHAIN:
3503 nf_tables_chain_destroy(trans->ctx.chain);
3504 break;
3505 case NFT_MSG_NEWRULE:
3506 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
3507 break;
3508 case NFT_MSG_NEWSET:
3509 nft_set_destroy(nft_trans_set(trans));
3510 break;
3511 }
3512 kfree(trans);
3513 }
3514
3515 static int nf_tables_abort(struct sk_buff *skb)
3516 {
3517 struct net *net = sock_net(skb->sk);
3518 struct nft_trans *trans, *next;
3519 struct nft_set *set;
3520
3521 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
3522 switch (trans->msg_type) {
3523 case NFT_MSG_NEWTABLE:
3524 if (nft_trans_table_update(trans)) {
3525 if (nft_trans_table_enable(trans)) {
3526 nf_tables_table_disable(trans->ctx.afi,
3527 trans->ctx.table);
3528 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
3529 }
3530 nft_trans_destroy(trans);
3531 } else {
3532 list_del_rcu(&trans->ctx.table->list);
3533 }
3534 break;
3535 case NFT_MSG_DELTABLE:
3536 list_add_tail_rcu(&trans->ctx.table->list,
3537 &trans->ctx.afi->tables);
3538 nft_trans_destroy(trans);
3539 break;
3540 case NFT_MSG_NEWCHAIN:
3541 if (nft_trans_chain_update(trans)) {
3542 if (nft_trans_chain_stats(trans))
3543 free_percpu(nft_trans_chain_stats(trans));
3544
3545 nft_trans_destroy(trans);
3546 } else {
3547 trans->ctx.table->use--;
3548 list_del_rcu(&trans->ctx.chain->list);
3549 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) &&
3550 trans->ctx.chain->flags & NFT_BASE_CHAIN) {
3551 nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops,
3552 trans->ctx.afi->nops);
3553 }
3554 }
3555 break;
3556 case NFT_MSG_DELCHAIN:
3557 trans->ctx.table->use++;
3558 list_add_tail_rcu(&trans->ctx.chain->list,
3559 &trans->ctx.table->chains);
3560 nft_trans_destroy(trans);
3561 break;
3562 case NFT_MSG_NEWRULE:
3563 trans->ctx.chain->use--;
3564 list_del_rcu(&nft_trans_rule(trans)->list);
3565 break;
3566 case NFT_MSG_DELRULE:
3567 trans->ctx.chain->use++;
3568 nft_rule_clear(trans->ctx.net, nft_trans_rule(trans));
3569 nft_trans_destroy(trans);
3570 break;
3571 case NFT_MSG_NEWSET:
3572 trans->ctx.table->use--;
3573 list_del_rcu(&nft_trans_set(trans)->list);
3574 break;
3575 case NFT_MSG_DELSET:
3576 trans->ctx.table->use++;
3577 list_add_tail_rcu(&nft_trans_set(trans)->list,
3578 &trans->ctx.table->sets);
3579 nft_trans_destroy(trans);
3580 break;
3581 case NFT_MSG_NEWSETELEM:
3582 nft_trans_elem_set(trans)->nelems--;
3583 set = nft_trans_elem_set(trans);
3584 set->ops->get(set, &nft_trans_elem(trans));
3585 set->ops->remove(set, &nft_trans_elem(trans));
3586 nft_trans_destroy(trans);
3587 break;
3588 case NFT_MSG_DELSETELEM:
3589 nft_trans_elem_set(trans)->nelems++;
3590 nft_trans_destroy(trans);
3591 break;
3592 }
3593 }
3594
3595 list_for_each_entry_safe_reverse(trans, next,
3596 &net->nft.commit_list, list) {
3597 list_del(&trans->list);
3598 trans->ctx.nla = NULL;
3599 call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu);
3600 }
3601
3602 return 0;
3603 }
3604
3605 static const struct nfnetlink_subsystem nf_tables_subsys = {
3606 .name = "nf_tables",
3607 .subsys_id = NFNL_SUBSYS_NFTABLES,
3608 .cb_count = NFT_MSG_MAX,
3609 .cb = nf_tables_cb,
3610 .commit = nf_tables_commit,
3611 .abort = nf_tables_abort,
3612 };
3613
3614 /*
3615 * Loop detection - walk through the ruleset beginning at the destination chain
3616 * of a new jump until either the source chain is reached (loop) or all
3617 * reachable chains have been traversed.
3618 *
3619 * The loop check is performed whenever a new jump verdict is added to an
3620 * expression or verdict map or a verdict map is bound to a new chain.
3621 */
3622
3623 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3624 const struct nft_chain *chain);
3625
3626 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
3627 const struct nft_set *set,
3628 const struct nft_set_iter *iter,
3629 const struct nft_set_elem *elem)
3630 {
3631 if (elem->flags & NFT_SET_ELEM_INTERVAL_END)
3632 return 0;
3633
3634 switch (elem->data.verdict) {
3635 case NFT_JUMP:
3636 case NFT_GOTO:
3637 return nf_tables_check_loops(ctx, elem->data.chain);
3638 default:
3639 return 0;
3640 }
3641 }
3642
3643 static int nf_tables_check_loops(const struct nft_ctx *ctx,
3644 const struct nft_chain *chain)
3645 {
3646 const struct nft_rule *rule;
3647 const struct nft_expr *expr, *last;
3648 const struct nft_set *set;
3649 struct nft_set_binding *binding;
3650 struct nft_set_iter iter;
3651
3652 if (ctx->chain == chain)
3653 return -ELOOP;
3654
3655 list_for_each_entry(rule, &chain->rules, list) {
3656 nft_rule_for_each_expr(expr, last, rule) {
3657 const struct nft_data *data = NULL;
3658 int err;
3659
3660 if (!expr->ops->validate)
3661 continue;
3662
3663 err = expr->ops->validate(ctx, expr, &data);
3664 if (err < 0)
3665 return err;
3666
3667 if (data == NULL)
3668 continue;
3669
3670 switch (data->verdict) {
3671 case NFT_JUMP:
3672 case NFT_GOTO:
3673 err = nf_tables_check_loops(ctx, data->chain);
3674 if (err < 0)
3675 return err;
3676 default:
3677 break;
3678 }
3679 }
3680 }
3681
3682 list_for_each_entry(set, &ctx->table->sets, list) {
3683 if (!(set->flags & NFT_SET_MAP) ||
3684 set->dtype != NFT_DATA_VERDICT)
3685 continue;
3686
3687 list_for_each_entry(binding, &set->bindings, list) {
3688 if (binding->chain != chain)
3689 continue;
3690
3691 iter.skip = 0;
3692 iter.count = 0;
3693 iter.err = 0;
3694 iter.fn = nf_tables_loop_check_setelem;
3695
3696 set->ops->walk(ctx, set, &iter);
3697 if (iter.err < 0)
3698 return iter.err;
3699 }
3700 }
3701
3702 return 0;
3703 }
3704
3705 /**
3706 * nft_validate_input_register - validate an expressions' input register
3707 *
3708 * @reg: the register number
3709 *
3710 * Validate that the input register is one of the general purpose
3711 * registers.
3712 */
3713 int nft_validate_input_register(enum nft_registers reg)
3714 {
3715 if (reg <= NFT_REG_VERDICT)
3716 return -EINVAL;
3717 if (reg > NFT_REG_MAX)
3718 return -ERANGE;
3719 return 0;
3720 }
3721 EXPORT_SYMBOL_GPL(nft_validate_input_register);
3722
3723 /**
3724 * nft_validate_output_register - validate an expressions' output register
3725 *
3726 * @reg: the register number
3727 *
3728 * Validate that the output register is one of the general purpose
3729 * registers or the verdict register.
3730 */
3731 int nft_validate_output_register(enum nft_registers reg)
3732 {
3733 if (reg < NFT_REG_VERDICT)
3734 return -EINVAL;
3735 if (reg > NFT_REG_MAX)
3736 return -ERANGE;
3737 return 0;
3738 }
3739 EXPORT_SYMBOL_GPL(nft_validate_output_register);
3740
3741 /**
3742 * nft_validate_data_load - validate an expressions' data load
3743 *
3744 * @ctx: context of the expression performing the load
3745 * @reg: the destination register number
3746 * @data: the data to load
3747 * @type: the data type
3748 *
3749 * Validate that a data load uses the appropriate data type for
3750 * the destination register. A value of NULL for the data means
3751 * that its runtime gathered data, which is always of type
3752 * NFT_DATA_VALUE.
3753 */
3754 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
3755 const struct nft_data *data,
3756 enum nft_data_types type)
3757 {
3758 int err;
3759
3760 switch (reg) {
3761 case NFT_REG_VERDICT:
3762 if (data == NULL || type != NFT_DATA_VERDICT)
3763 return -EINVAL;
3764
3765 if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) {
3766 err = nf_tables_check_loops(ctx, data->chain);
3767 if (err < 0)
3768 return err;
3769
3770 if (ctx->chain->level + 1 > data->chain->level) {
3771 if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE)
3772 return -EMLINK;
3773 data->chain->level = ctx->chain->level + 1;
3774 }
3775 }
3776
3777 return 0;
3778 default:
3779 if (data != NULL && type != NFT_DATA_VALUE)
3780 return -EINVAL;
3781 return 0;
3782 }
3783 }
3784 EXPORT_SYMBOL_GPL(nft_validate_data_load);
3785
3786 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
3787 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
3788 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
3789 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3790 };
3791
3792 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
3793 struct nft_data_desc *desc, const struct nlattr *nla)
3794 {
3795 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
3796 struct nft_chain *chain;
3797 int err;
3798
3799 err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy);
3800 if (err < 0)
3801 return err;
3802
3803 if (!tb[NFTA_VERDICT_CODE])
3804 return -EINVAL;
3805 data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
3806
3807 switch (data->verdict) {
3808 default:
3809 switch (data->verdict & NF_VERDICT_MASK) {
3810 case NF_ACCEPT:
3811 case NF_DROP:
3812 case NF_QUEUE:
3813 break;
3814 default:
3815 return -EINVAL;
3816 }
3817 /* fall through */
3818 case NFT_CONTINUE:
3819 case NFT_BREAK:
3820 case NFT_RETURN:
3821 desc->len = sizeof(data->verdict);
3822 break;
3823 case NFT_JUMP:
3824 case NFT_GOTO:
3825 if (!tb[NFTA_VERDICT_CHAIN])
3826 return -EINVAL;
3827 chain = nf_tables_chain_lookup(ctx->table,
3828 tb[NFTA_VERDICT_CHAIN]);
3829 if (IS_ERR(chain))
3830 return PTR_ERR(chain);
3831 if (chain->flags & NFT_BASE_CHAIN)
3832 return -EOPNOTSUPP;
3833
3834 chain->use++;
3835 data->chain = chain;
3836 desc->len = sizeof(data);
3837 break;
3838 }
3839
3840 desc->type = NFT_DATA_VERDICT;
3841 return 0;
3842 }
3843
3844 static void nft_verdict_uninit(const struct nft_data *data)
3845 {
3846 switch (data->verdict) {
3847 case NFT_JUMP:
3848 case NFT_GOTO:
3849 data->chain->use--;
3850 break;
3851 }
3852 }
3853
3854 static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data)
3855 {
3856 struct nlattr *nest;
3857
3858 nest = nla_nest_start(skb, NFTA_DATA_VERDICT);
3859 if (!nest)
3860 goto nla_put_failure;
3861
3862 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict)))
3863 goto nla_put_failure;
3864
3865 switch (data->verdict) {
3866 case NFT_JUMP:
3867 case NFT_GOTO:
3868 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name))
3869 goto nla_put_failure;
3870 }
3871 nla_nest_end(skb, nest);
3872 return 0;
3873
3874 nla_put_failure:
3875 return -1;
3876 }
3877
3878 static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data,
3879 struct nft_data_desc *desc, const struct nlattr *nla)
3880 {
3881 unsigned int len;
3882
3883 len = nla_len(nla);
3884 if (len == 0)
3885 return -EINVAL;
3886 if (len > sizeof(data->data))
3887 return -EOVERFLOW;
3888
3889 nla_memcpy(data->data, nla, sizeof(data->data));
3890 desc->type = NFT_DATA_VALUE;
3891 desc->len = len;
3892 return 0;
3893 }
3894
3895 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
3896 unsigned int len)
3897 {
3898 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
3899 }
3900
3901 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
3902 [NFTA_DATA_VALUE] = { .type = NLA_BINARY,
3903 .len = FIELD_SIZEOF(struct nft_data, data) },
3904 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
3905 };
3906
3907 /**
3908 * nft_data_init - parse nf_tables data netlink attributes
3909 *
3910 * @ctx: context of the expression using the data
3911 * @data: destination struct nft_data
3912 * @desc: data description
3913 * @nla: netlink attribute containing data
3914 *
3915 * Parse the netlink data attributes and initialize a struct nft_data.
3916 * The type and length of data are returned in the data description.
3917 *
3918 * The caller can indicate that it only wants to accept data of type
3919 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3920 */
3921 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
3922 struct nft_data_desc *desc, const struct nlattr *nla)
3923 {
3924 struct nlattr *tb[NFTA_DATA_MAX + 1];
3925 int err;
3926
3927 err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy);
3928 if (err < 0)
3929 return err;
3930
3931 if (tb[NFTA_DATA_VALUE])
3932 return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
3933 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
3934 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
3935 return -EINVAL;
3936 }
3937 EXPORT_SYMBOL_GPL(nft_data_init);
3938
3939 /**
3940 * nft_data_uninit - release a nft_data item
3941 *
3942 * @data: struct nft_data to release
3943 * @type: type of data
3944 *
3945 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3946 * all others need to be released by calling this function.
3947 */
3948 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type)
3949 {
3950 switch (type) {
3951 case NFT_DATA_VALUE:
3952 return;
3953 case NFT_DATA_VERDICT:
3954 return nft_verdict_uninit(data);
3955 default:
3956 WARN_ON(1);
3957 }
3958 }
3959 EXPORT_SYMBOL_GPL(nft_data_uninit);
3960
3961 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
3962 enum nft_data_types type, unsigned int len)
3963 {
3964 struct nlattr *nest;
3965 int err;
3966
3967 nest = nla_nest_start(skb, attr);
3968 if (nest == NULL)
3969 return -1;
3970
3971 switch (type) {
3972 case NFT_DATA_VALUE:
3973 err = nft_value_dump(skb, data, len);
3974 break;
3975 case NFT_DATA_VERDICT:
3976 err = nft_verdict_dump(skb, data);
3977 break;
3978 default:
3979 err = -EINVAL;
3980 WARN_ON(1);
3981 }
3982
3983 nla_nest_end(skb, nest);
3984 return err;
3985 }
3986 EXPORT_SYMBOL_GPL(nft_data_dump);
3987
3988 static int nf_tables_init_net(struct net *net)
3989 {
3990 INIT_LIST_HEAD(&net->nft.af_info);
3991 INIT_LIST_HEAD(&net->nft.commit_list);
3992 net->nft.base_seq = 1;
3993 return 0;
3994 }
3995
3996 static struct pernet_operations nf_tables_net_ops = {
3997 .init = nf_tables_init_net,
3998 };
3999
4000 static int __init nf_tables_module_init(void)
4001 {
4002 int err;
4003
4004 info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS,
4005 GFP_KERNEL);
4006 if (info == NULL) {
4007 err = -ENOMEM;
4008 goto err1;
4009 }
4010
4011 err = nf_tables_core_module_init();
4012 if (err < 0)
4013 goto err2;
4014
4015 err = nfnetlink_subsys_register(&nf_tables_subsys);
4016 if (err < 0)
4017 goto err3;
4018
4019 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4020 return register_pernet_subsys(&nf_tables_net_ops);
4021 err3:
4022 nf_tables_core_module_exit();
4023 err2:
4024 kfree(info);
4025 err1:
4026 return err;
4027 }
4028
4029 static void __exit nf_tables_module_exit(void)
4030 {
4031 unregister_pernet_subsys(&nf_tables_net_ops);
4032 nfnetlink_subsys_unregister(&nf_tables_subsys);
4033 nf_tables_core_module_exit();
4034 kfree(info);
4035 }
4036
4037 module_init(nf_tables_module_init);
4038 module_exit(nf_tables_module_exit);
4039
4040 MODULE_LICENSE("GPL");
4041 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4042 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);
Linux kernel - Deliverables
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