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Commit | Line | Data |
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96518518 | 1 | /* |
20a69341 | 2 | * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
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> | |
99633ab2 | 21 | #include <net/net_namespace.h> |
96518518 PM |
22 | #include <net/sock.h> |
23 | ||
96518518 PM |
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 | */ | |
99633ab2 | 34 | int nft_register_afinfo(struct net *net, struct nft_af_info *afi) |
96518518 PM |
35 | { |
36 | INIT_LIST_HEAD(&afi->tables); | |
37 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 38 | list_add_tail_rcu(&afi->list, &net->nft.af_info); |
96518518 PM |
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); | |
e688a7f8 | 54 | list_del_rcu(&afi->list); |
96518518 PM |
55 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
56 | } | |
57 | EXPORT_SYMBOL_GPL(nft_unregister_afinfo); | |
58 | ||
99633ab2 | 59 | static struct nft_af_info *nft_afinfo_lookup(struct net *net, int family) |
96518518 PM |
60 | { |
61 | struct nft_af_info *afi; | |
62 | ||
99633ab2 | 63 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
64 | if (afi->family == family) |
65 | return afi; | |
66 | } | |
67 | return NULL; | |
68 | } | |
69 | ||
99633ab2 PNA |
70 | static struct nft_af_info * |
71 | nf_tables_afinfo_lookup(struct net *net, int family, bool autoload) | |
96518518 PM |
72 | { |
73 | struct nft_af_info *afi; | |
74 | ||
99633ab2 | 75 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
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); | |
99633ab2 | 83 | afi = nft_afinfo_lookup(net, family); |
96518518 PM |
84 | if (afi != NULL) |
85 | return ERR_PTR(-EAGAIN); | |
86 | } | |
87 | #endif | |
88 | return ERR_PTR(-EAFNOSUPPORT); | |
89 | } | |
90 | ||
7c95f6d8 PNA |
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 | { | |
128ad332 PNA |
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; | |
7c95f6d8 PNA |
107 | } |
108 | ||
b380e5c7 PNA |
109 | static struct nft_trans *nft_trans_alloc(struct nft_ctx *ctx, int msg_type, |
110 | u32 size) | |
1081d11b PNA |
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 | ||
b380e5c7 | 118 | trans->msg_type = msg_type; |
1081d11b PNA |
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 | ||
96518518 PM |
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, | |
9370761c | 147 | const struct nlattr *nla) |
96518518 PM |
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 | ||
96518518 PM |
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 | ||
2a37d755 | 166 | static const struct nf_chain_type *chain_type[AF_MAX][NFT_CHAIN_T_MAX]; |
9370761c | 167 | |
2a37d755 | 168 | static const struct nf_chain_type * |
baae3e62 | 169 | __nf_tables_chain_type_lookup(int family, const struct nlattr *nla) |
9370761c PNA |
170 | { |
171 | int i; | |
172 | ||
baae3e62 | 173 | for (i = 0; i < NFT_CHAIN_T_MAX; i++) { |
9370761c PNA |
174 | if (chain_type[family][i] != NULL && |
175 | !nla_strcmp(nla, chain_type[family][i]->name)) | |
baae3e62 | 176 | return chain_type[family][i]; |
9370761c | 177 | } |
baae3e62 | 178 | return NULL; |
9370761c PNA |
179 | } |
180 | ||
2a37d755 | 181 | static const struct nf_chain_type * |
baae3e62 PM |
182 | nf_tables_chain_type_lookup(const struct nft_af_info *afi, |
183 | const struct nlattr *nla, | |
184 | bool autoload) | |
9370761c | 185 | { |
2a37d755 | 186 | const struct nf_chain_type *type; |
9370761c PNA |
187 | |
188 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
189 | if (type != NULL) |
190 | return type; | |
9370761c | 191 | #ifdef CONFIG_MODULES |
93b0806f | 192 | if (autoload) { |
9370761c | 193 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
2fec6bb6 PNA |
194 | request_module("nft-chain-%u-%.*s", afi->family, |
195 | nla_len(nla), (const char *)nla_data(nla)); | |
9370761c PNA |
196 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
197 | type = __nf_tables_chain_type_lookup(afi->family, nla); | |
93b0806f PM |
198 | if (type != NULL) |
199 | return ERR_PTR(-EAGAIN); | |
9370761c PNA |
200 | } |
201 | #endif | |
93b0806f | 202 | return ERR_PTR(-ENOENT); |
9370761c PNA |
203 | } |
204 | ||
96518518 PM |
205 | static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { |
206 | [NFTA_TABLE_NAME] = { .type = NLA_STRING }, | |
9ddf6323 | 207 | [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
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 | ||
9ddf6323 | 227 | if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || |
d8bcc768 TB |
228 | nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || |
229 | nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use))) | |
96518518 PM |
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 | ||
35151d84 | 239 | static int nf_tables_table_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
240 | { |
241 | struct sk_buff *skb; | |
96518518 PM |
242 | int err; |
243 | ||
128ad332 PNA |
244 | if (!ctx->report && |
245 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
246 | return 0; |
247 | ||
248 | err = -ENOBUFS; | |
249 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
250 | if (skb == NULL) | |
251 | goto err; | |
252 | ||
128ad332 | 253 | err = nf_tables_fill_table_info(skb, ctx->portid, ctx->seq, event, 0, |
35151d84 | 254 | ctx->afi->family, ctx->table); |
96518518 PM |
255 | if (err < 0) { |
256 | kfree_skb(skb); | |
257 | goto err; | |
258 | } | |
259 | ||
128ad332 PNA |
260 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
261 | ctx->report, GFP_KERNEL); | |
96518518 | 262 | err: |
128ad332 PNA |
263 | if (err < 0) { |
264 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
265 | err); | |
266 | } | |
96518518 PM |
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]; | |
99633ab2 | 277 | struct net *net = sock_net(skb->sk); |
96518518 PM |
278 | int family = nfmsg->nfgen_family; |
279 | ||
e688a7f8 | 280 | rcu_read_lock(); |
38e029f1 PNA |
281 | cb->seq = net->nft.base_seq; |
282 | ||
e688a7f8 | 283 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
284 | if (family != NFPROTO_UNSPEC && family != afi->family) |
285 | continue; | |
286 | ||
e688a7f8 | 287 | list_for_each_entry_rcu(table, &afi->tables, list) { |
96518518 PM |
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; | |
38e029f1 PNA |
300 | |
301 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
302 | cont: |
303 | idx++; | |
304 | } | |
305 | } | |
306 | done: | |
e688a7f8 | 307 | rcu_read_unlock(); |
96518518 PM |
308 | cb->args[0] = idx; |
309 | return skb->len; | |
310 | } | |
311 | ||
55dd6f93 PNA |
312 | /* Internal table flags */ |
313 | #define NFT_TABLE_INACTIVE (1 << 15) | |
314 | ||
96518518 PM |
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; | |
99633ab2 | 323 | struct net *net = sock_net(skb->sk); |
96518518 PM |
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 | ||
99633ab2 | 334 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
335 | if (IS_ERR(afi)) |
336 | return PTR_ERR(afi); | |
337 | ||
9370761c | 338 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
339 | if (IS_ERR(table)) |
340 | return PTR_ERR(table); | |
55dd6f93 PNA |
341 | if (table->flags & NFT_TABLE_INACTIVE) |
342 | return -ENOENT; | |
96518518 PM |
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 | ||
115a60b1 PM |
361 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
362 | struct nft_table *table) | |
9ddf6323 PNA |
363 | { |
364 | struct nft_chain *chain; | |
365 | int err, i = 0; | |
366 | ||
367 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
368 | if (!(chain->flags & NFT_BASE_CHAIN)) |
369 | continue; | |
370 | ||
115a60b1 | 371 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
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) { | |
d2012975 PNA |
380 | if (!(chain->flags & NFT_BASE_CHAIN)) |
381 | continue; | |
382 | ||
9ddf6323 PNA |
383 | if (i-- <= 0) |
384 | break; | |
385 | ||
115a60b1 | 386 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
387 | } |
388 | return err; | |
389 | } | |
390 | ||
f75edf5e | 391 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
115a60b1 | 392 | struct nft_table *table) |
9ddf6323 PNA |
393 | { |
394 | struct nft_chain *chain; | |
395 | ||
d2012975 PNA |
396 | list_for_each_entry(chain, &table->chains, list) { |
397 | if (chain->flags & NFT_BASE_CHAIN) | |
115a60b1 PM |
398 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
399 | afi->nops); | |
d2012975 | 400 | } |
9ddf6323 PNA |
401 | } |
402 | ||
e1aaca93 | 403 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 404 | { |
55dd6f93 | 405 | struct nft_trans *trans; |
e1aaca93 | 406 | u32 flags; |
55dd6f93 | 407 | int ret = 0; |
9ddf6323 | 408 | |
e1aaca93 PNA |
409 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
410 | return 0; | |
9ddf6323 | 411 | |
e1aaca93 PNA |
412 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
413 | if (flags & ~NFT_TABLE_F_DORMANT) | |
414 | return -EINVAL; | |
415 | ||
63283dd2 PNA |
416 | if (flags == ctx->table->flags) |
417 | return 0; | |
418 | ||
55dd6f93 PNA |
419 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
420 | sizeof(struct nft_trans_table)); | |
421 | if (trans == NULL) | |
422 | return -ENOMEM; | |
9ddf6323 | 423 | |
e1aaca93 PNA |
424 | if ((flags & NFT_TABLE_F_DORMANT) && |
425 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 426 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
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); | |
55dd6f93 | 430 | if (ret >= 0) { |
e1aaca93 | 431 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 432 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 433 | } |
9ddf6323 | 434 | } |
e1aaca93 PNA |
435 | if (ret < 0) |
436 | goto err; | |
9ddf6323 | 437 | |
55dd6f93 PNA |
438 | nft_trans_table_update(trans) = true; |
439 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
440 | return 0; | |
9ddf6323 | 441 | err: |
55dd6f93 | 442 | nft_trans_destroy(trans); |
9ddf6323 PNA |
443 | return ret; |
444 | } | |
445 | ||
55dd6f93 PNA |
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 | ||
96518518 PM |
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; | |
99633ab2 | 469 | struct net *net = sock_net(skb->sk); |
96518518 | 470 | int family = nfmsg->nfgen_family; |
c5c1f975 | 471 | u32 flags = 0; |
e1aaca93 | 472 | struct nft_ctx ctx; |
55dd6f93 | 473 | int err; |
96518518 | 474 | |
99633ab2 | 475 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
476 | if (IS_ERR(afi)) |
477 | return PTR_ERR(afi); | |
478 | ||
479 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 480 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
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) { | |
55dd6f93 PNA |
488 | if (table->flags & NFT_TABLE_INACTIVE) |
489 | return -ENOENT; | |
96518518 PM |
490 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
491 | return -EEXIST; | |
492 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
493 | return -EOPNOTSUPP; | |
e1aaca93 PNA |
494 | |
495 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); | |
496 | return nf_tables_updtable(&ctx); | |
96518518 PM |
497 | } |
498 | ||
c5c1f975 PM |
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 | ||
7047f9d0 PM |
505 | if (!try_module_get(afi->owner)) |
506 | return -EAFNOSUPPORT; | |
507 | ||
96518518 | 508 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); |
7047f9d0 PM |
509 | if (table == NULL) { |
510 | module_put(afi->owner); | |
96518518 | 511 | return -ENOMEM; |
7047f9d0 | 512 | } |
96518518 PM |
513 | |
514 | nla_strlcpy(table->name, name, nla_len(name)); | |
515 | INIT_LIST_HEAD(&table->chains); | |
20a69341 | 516 | INIT_LIST_HEAD(&table->sets); |
c5c1f975 | 517 | table->flags = flags; |
9ddf6323 | 518 | |
55dd6f93 PNA |
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 | } | |
e688a7f8 | 526 | list_add_tail_rcu(&table->list, &afi->tables); |
96518518 PM |
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; | |
99633ab2 | 537 | struct net *net = sock_net(skb->sk); |
55dd6f93 PNA |
538 | int family = nfmsg->nfgen_family, err; |
539 | struct nft_ctx ctx; | |
96518518 | 540 | |
99633ab2 | 541 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
542 | if (IS_ERR(afi)) |
543 | return PTR_ERR(afi); | |
544 | ||
9370761c | 545 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
546 | if (IS_ERR(table)) |
547 | return PTR_ERR(table); | |
55dd6f93 PNA |
548 | if (table->flags & NFT_TABLE_INACTIVE) |
549 | return -ENOENT; | |
4fefee57 | 550 | if (table->use > 0) |
96518518 PM |
551 | return -EBUSY; |
552 | ||
55dd6f93 PNA |
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 | ||
e688a7f8 | 558 | list_del_rcu(&table->list); |
96518518 PM |
559 | return 0; |
560 | } | |
561 | ||
55dd6f93 PNA |
562 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
563 | { | |
4fefee57 PNA |
564 | BUG_ON(ctx->table->use > 0); |
565 | ||
55dd6f93 PNA |
566 | kfree(ctx->table); |
567 | module_put(ctx->afi->owner); | |
568 | } | |
569 | ||
2a37d755 | 570 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 571 | { |
9370761c | 572 | int err = 0; |
96518518 PM |
573 | |
574 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
575 | if (chain_type[ctype->family][ctype->type] != NULL) { |
576 | err = -EBUSY; | |
577 | goto out; | |
96518518 | 578 | } |
9370761c PNA |
579 | chain_type[ctype->family][ctype->type] = ctype; |
580 | out: | |
96518518 PM |
581 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
582 | return err; | |
583 | } | |
9370761c | 584 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 585 | |
2a37d755 | 586 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 587 | { |
96518518 | 588 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 589 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
590 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
591 | } | |
9370761c | 592 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
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 }, | |
0ca743a5 | 633 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 634 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 635 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
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 | ||
0ca743a5 PNA |
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; | |
ce355e20 ED |
647 | unsigned int seq; |
648 | u64 pkts, bytes; | |
0ca743a5 PNA |
649 | int cpu; |
650 | ||
651 | memset(&total, 0, sizeof(total)); | |
652 | for_each_possible_cpu(cpu) { | |
653 | cpu_stats = per_cpu_ptr(stats, cpu); | |
ce355e20 ED |
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; | |
0ca743a5 PNA |
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 | ||
96518518 PM |
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) { | |
0ca743a5 | 703 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 704 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
705 | struct nlattr *nest; |
706 | ||
707 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
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); | |
9370761c | 715 | |
0ca743a5 PNA |
716 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
717 | htonl(basechain->policy))) | |
718 | goto nla_put_failure; | |
719 | ||
baae3e62 PM |
720 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
721 | goto nla_put_failure; | |
0ca743a5 PNA |
722 | |
723 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
724 | goto nla_put_failure; | |
96518518 PM |
725 | } |
726 | ||
0ca743a5 PNA |
727 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
728 | goto nla_put_failure; | |
729 | ||
96518518 PM |
730 | return nlmsg_end(skb, nlh); |
731 | ||
732 | nla_put_failure: | |
733 | nlmsg_trim(skb, nlh); | |
734 | return -1; | |
735 | } | |
736 | ||
35151d84 | 737 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
738 | { |
739 | struct sk_buff *skb; | |
96518518 PM |
740 | int err; |
741 | ||
128ad332 PNA |
742 | if (!ctx->report && |
743 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
744 | return 0; |
745 | ||
746 | err = -ENOBUFS; | |
747 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
748 | if (skb == NULL) | |
749 | goto err; | |
750 | ||
128ad332 | 751 | err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0, |
35151d84 PNA |
752 | ctx->afi->family, ctx->table, |
753 | ctx->chain); | |
96518518 PM |
754 | if (err < 0) { |
755 | kfree_skb(skb); | |
756 | goto err; | |
757 | } | |
758 | ||
128ad332 PNA |
759 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
760 | ctx->report, GFP_KERNEL); | |
96518518 | 761 | err: |
128ad332 PNA |
762 | if (err < 0) { |
763 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
764 | err); | |
765 | } | |
96518518 PM |
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]; | |
99633ab2 | 777 | struct net *net = sock_net(skb->sk); |
96518518 PM |
778 | int family = nfmsg->nfgen_family; |
779 | ||
e688a7f8 | 780 | rcu_read_lock(); |
38e029f1 PNA |
781 | cb->seq = net->nft.base_seq; |
782 | ||
e688a7f8 | 783 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
784 | if (family != NFPROTO_UNSPEC && family != afi->family) |
785 | continue; | |
786 | ||
e688a7f8 PNA |
787 | list_for_each_entry_rcu(table, &afi->tables, list) { |
788 | list_for_each_entry_rcu(chain, &table->chains, list) { | |
96518518 PM |
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; | |
38e029f1 PNA |
800 | |
801 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
802 | cont: |
803 | idx++; | |
804 | } | |
805 | } | |
806 | } | |
807 | done: | |
e688a7f8 | 808 | rcu_read_unlock(); |
96518518 PM |
809 | cb->args[0] = idx; |
810 | return skb->len; | |
811 | } | |
812 | ||
96518518 PM |
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; | |
99633ab2 | 822 | struct net *net = sock_net(skb->sk); |
96518518 PM |
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 | ||
99633ab2 | 833 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
834 | if (IS_ERR(afi)) |
835 | return PTR_ERR(afi); | |
836 | ||
9370761c | 837 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
838 | if (IS_ERR(table)) |
839 | return PTR_ERR(table); | |
55dd6f93 PNA |
840 | if (table->flags & NFT_TABLE_INACTIVE) |
841 | return -ENOENT; | |
96518518 PM |
842 | |
843 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
844 | if (IS_ERR(chain)) | |
845 | return PTR_ERR(chain); | |
91c7b38d PNA |
846 | if (chain->flags & NFT_CHAIN_INACTIVE) |
847 | return -ENOENT; | |
96518518 PM |
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 | ||
0ca743a5 PNA |
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 | ||
ff3cd7b3 | 871 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
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) | |
ff3cd7b3 | 880 | return ERR_PTR(err); |
0ca743a5 PNA |
881 | |
882 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 883 | return ERR_PTR(-EINVAL); |
0ca743a5 | 884 | |
ce355e20 | 885 | newstats = netdev_alloc_pcpu_stats(struct nft_stats); |
0ca743a5 | 886 | if (newstats == NULL) |
ff3cd7b3 | 887 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
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 | ||
ff3cd7b3 PNA |
896 | return newstats; |
897 | } | |
898 | ||
899 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
900 | struct nft_stats __percpu *newstats) | |
901 | { | |
0ca743a5 | 902 | if (chain->stats) { |
0ca743a5 | 903 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 904 | nft_dereference(chain->stats); |
0ca743a5 PNA |
905 | |
906 | rcu_assign_pointer(chain->stats, newstats); | |
907 | synchronize_rcu(); | |
908 | free_percpu(oldstats); | |
909 | } else | |
910 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
911 | } |
912 | ||
91c7b38d PNA |
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; | |
0ca743a5 | 923 | |
91c7b38d | 924 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0ca743a5 PNA |
925 | return 0; |
926 | } | |
927 | ||
91c7b38d PNA |
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 | ||
96518518 PM |
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); | |
7c95f6d8 | 947 | struct nft_af_info *afi; |
96518518 PM |
948 | struct nft_table *table; |
949 | struct nft_chain *chain; | |
0ca743a5 | 950 | struct nft_base_chain *basechain = NULL; |
96518518 | 951 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
99633ab2 | 952 | struct net *net = sock_net(skb->sk); |
96518518 | 953 | int family = nfmsg->nfgen_family; |
57de2a0c | 954 | u8 policy = NF_ACCEPT; |
96518518 | 955 | u64 handle = 0; |
115a60b1 | 956 | unsigned int i; |
ff3cd7b3 | 957 | struct nft_stats __percpu *stats; |
96518518 PM |
958 | int err; |
959 | bool create; | |
91c7b38d | 960 | struct nft_ctx ctx; |
96518518 PM |
961 | |
962 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
963 | ||
99633ab2 | 964 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
965 | if (IS_ERR(afi)) |
966 | return PTR_ERR(afi); | |
967 | ||
9370761c | 968 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
969 | if (IS_ERR(table)) |
970 | return PTR_ERR(table); | |
971 | ||
96518518 PM |
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 | ||
57de2a0c PM |
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 | ||
8f46df18 | 995 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
996 | switch (policy) { |
997 | case NF_DROP: | |
998 | case NF_ACCEPT: | |
999 | break; | |
1000 | default: | |
1001 | return -EINVAL; | |
1002 | } | |
1003 | } | |
1004 | ||
96518518 | 1005 | if (chain != NULL) { |
91c7b38d PNA |
1006 | struct nft_stats *stats = NULL; |
1007 | struct nft_trans *trans; | |
1008 | ||
1009 | if (chain->flags & NFT_CHAIN_INACTIVE) | |
1010 | return -ENOENT; | |
96518518 PM |
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 | ||
0ca743a5 PNA |
1020 | if (nla[NFTA_CHAIN_COUNTERS]) { |
1021 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1022 | return -EOPNOTSUPP; | |
1023 | ||
ff3cd7b3 PNA |
1024 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1025 | if (IS_ERR(stats)) | |
1026 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1027 | } |
1028 | ||
91c7b38d PNA |
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; | |
4401a862 | 1034 | |
91c7b38d PNA |
1035 | nft_trans_chain_stats(trans) = stats; |
1036 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1037 | |
91c7b38d PNA |
1038 | if (nla[NFTA_CHAIN_POLICY]) |
1039 | nft_trans_chain_policy(trans) = policy; | |
1040 | else | |
1041 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1042 | |
91c7b38d PNA |
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; | |
96518518 PM |
1049 | } |
1050 | ||
75820676 PM |
1051 | if (table->use == UINT_MAX) |
1052 | return -EOVERFLOW; | |
1053 | ||
96518518 | 1054 | if (nla[NFTA_CHAIN_HOOK]) { |
2a37d755 | 1055 | const struct nf_chain_type *type; |
96518518 | 1056 | struct nf_hook_ops *ops; |
9370761c | 1057 | nf_hookfn *hookfn; |
115a60b1 | 1058 | u32 hooknum, priority; |
9370761c | 1059 | |
baae3e62 | 1060 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
9370761c PNA |
1061 | if (nla[NFTA_CHAIN_TYPE]) { |
1062 | type = nf_tables_chain_type_lookup(afi, | |
1063 | nla[NFTA_CHAIN_TYPE], | |
1064 | create); | |
93b0806f PM |
1065 | if (IS_ERR(type)) |
1066 | return PTR_ERR(type); | |
9370761c | 1067 | } |
96518518 PM |
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; | |
9370761c PNA |
1076 | |
1077 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1078 | if (hooknum >= afi->nhooks) | |
96518518 | 1079 | return -EINVAL; |
115a60b1 | 1080 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 1081 | |
baae3e62 | 1082 | if (!(type->hook_mask & (1 << hooknum))) |
9370761c | 1083 | return -EOPNOTSUPP; |
fa2c1de0 | 1084 | if (!try_module_get(type->owner)) |
baae3e62 | 1085 | return -ENOENT; |
fa2c1de0 | 1086 | hookfn = type->hooks[hooknum]; |
9370761c | 1087 | |
96518518 PM |
1088 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
1089 | if (basechain == NULL) | |
1090 | return -ENOMEM; | |
9370761c | 1091 | |
4401a862 | 1092 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1093 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1094 | if (IS_ERR(stats)) { | |
fa2c1de0 | 1095 | module_put(type->owner); |
4401a862 | 1096 | kfree(basechain); |
ff3cd7b3 | 1097 | return PTR_ERR(stats); |
4401a862 | 1098 | } |
ff3cd7b3 | 1099 | basechain->stats = stats; |
4401a862 | 1100 | } else { |
ce355e20 | 1101 | stats = netdev_alloc_pcpu_stats(struct nft_stats); |
ff3cd7b3 | 1102 | if (IS_ERR(stats)) { |
fa2c1de0 | 1103 | module_put(type->owner); |
4401a862 | 1104 | kfree(basechain); |
ff3cd7b3 | 1105 | return PTR_ERR(stats); |
4401a862 | 1106 | } |
ff3cd7b3 | 1107 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1108 | } |
1109 | ||
9370761c | 1110 | basechain->type = type; |
96518518 PM |
1111 | chain = &basechain->chain; |
1112 | ||
115a60b1 PM |
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 | } | |
96518518 PM |
1126 | |
1127 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1128 | basechain->policy = policy; |
96518518 PM |
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); | |
0628b123 | 1137 | chain->net = net; |
b5bc89bf | 1138 | chain->table = table; |
96518518 PM |
1139 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1140 | ||
9ddf6323 PNA |
1141 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1142 | chain->flags & NFT_BASE_CHAIN) { | |
115a60b1 | 1143 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
91c7b38d PNA |
1144 | if (err < 0) |
1145 | goto err1; | |
0ca743a5 | 1146 | } |
96518518 | 1147 | |
91c7b38d PNA |
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; | |
96518518 | 1152 | |
4fefee57 | 1153 | table->use++; |
e688a7f8 | 1154 | list_add_tail_rcu(&chain->list, &table->chains); |
91c7b38d PNA |
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; | |
96518518 PM |
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); | |
7c95f6d8 | 1172 | struct nft_af_info *afi; |
96518518 PM |
1173 | struct nft_table *table; |
1174 | struct nft_chain *chain; | |
99633ab2 | 1175 | struct net *net = sock_net(skb->sk); |
96518518 | 1176 | int family = nfmsg->nfgen_family; |
91c7b38d PNA |
1177 | struct nft_ctx ctx; |
1178 | int err; | |
96518518 | 1179 | |
99633ab2 | 1180 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1181 | if (IS_ERR(afi)) |
1182 | return PTR_ERR(afi); | |
1183 | ||
9370761c | 1184 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1185 | if (IS_ERR(table)) |
1186 | return PTR_ERR(table); | |
55dd6f93 PNA |
1187 | if (table->flags & NFT_TABLE_INACTIVE) |
1188 | return -ENOENT; | |
96518518 PM |
1189 | |
1190 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1191 | if (IS_ERR(chain)) | |
1192 | return PTR_ERR(chain); | |
91c7b38d PNA |
1193 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1194 | return -ENOENT; | |
4fefee57 | 1195 | if (chain->use > 0) |
96518518 PM |
1196 | return -EBUSY; |
1197 | ||
91c7b38d PNA |
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; | |
0165d932 | 1202 | |
4fefee57 | 1203 | table->use--; |
e688a7f8 | 1204 | list_del_rcu(&chain->list); |
96518518 PM |
1205 | return 0; |
1206 | } | |
1207 | ||
96518518 PM |
1208 | /* |
1209 | * Expressions | |
1210 | */ | |
1211 | ||
1212 | /** | |
ef1f7df9 PM |
1213 | * nft_register_expr - register nf_tables expr type |
1214 | * @ops: expr type | |
96518518 | 1215 | * |
ef1f7df9 | 1216 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1217 | * success or a negative errno code otherwise. |
1218 | */ | |
ef1f7df9 | 1219 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1220 | { |
1221 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec | 1222 | if (type->family == NFPROTO_UNSPEC) |
e688a7f8 | 1223 | list_add_tail_rcu(&type->list, &nf_tables_expressions); |
758dbcec | 1224 | else |
e688a7f8 | 1225 | list_add_rcu(&type->list, &nf_tables_expressions); |
96518518 PM |
1226 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1227 | return 0; | |
1228 | } | |
1229 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1230 | ||
1231 | /** | |
ef1f7df9 PM |
1232 | * nft_unregister_expr - unregister nf_tables expr type |
1233 | * @ops: expr type | |
96518518 | 1234 | * |
ef1f7df9 | 1235 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1236 | */ |
ef1f7df9 | 1237 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1238 | { |
1239 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
e688a7f8 | 1240 | list_del_rcu(&type->list); |
96518518 PM |
1241 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1242 | } | |
1243 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1244 | ||
64d46806 PM |
1245 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1246 | struct nlattr *nla) | |
96518518 | 1247 | { |
ef1f7df9 | 1248 | const struct nft_expr_type *type; |
96518518 | 1249 | |
ef1f7df9 | 1250 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1251 | if (!nla_strcmp(nla, type->name) && |
1252 | (!type->family || type->family == family)) | |
ef1f7df9 | 1253 | return type; |
96518518 PM |
1254 | } |
1255 | return NULL; | |
1256 | } | |
1257 | ||
64d46806 PM |
1258 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1259 | struct nlattr *nla) | |
96518518 | 1260 | { |
ef1f7df9 | 1261 | const struct nft_expr_type *type; |
96518518 PM |
1262 | |
1263 | if (nla == NULL) | |
1264 | return ERR_PTR(-EINVAL); | |
1265 | ||
64d46806 | 1266 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1267 | if (type != NULL && try_module_get(type->owner)) |
1268 | return type; | |
96518518 PM |
1269 | |
1270 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1271 | if (type == NULL) { |
64d46806 PM |
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 | ||
96518518 PM |
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); | |
64d46806 | 1283 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
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 | { | |
ef1f7df9 | 1298 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
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; | |
ef1f7df9 | 1318 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1319 | }; |
1320 | ||
0ca743a5 PNA |
1321 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1322 | const struct nlattr *nla, | |
96518518 PM |
1323 | struct nft_expr_info *info) |
1324 | { | |
ef1f7df9 | 1325 | const struct nft_expr_type *type; |
96518518 | 1326 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1327 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1328 | int err; |
1329 | ||
ef1f7df9 | 1330 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1331 | if (err < 0) |
1332 | return err; | |
1333 | ||
64d46806 | 1334 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
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) { | |
0ca743a5 PNA |
1347 | ops = type->select_ops(ctx, |
1348 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1349 | if (IS_ERR(ops)) { |
1350 | err = PTR_ERR(ops); | |
1351 | goto err1; | |
1352 | } | |
1353 | } else | |
1354 | ops = type->ops; | |
1355 | ||
96518518 PM |
1356 | info->ops = ops; |
1357 | return 0; | |
ef1f7df9 PM |
1358 | |
1359 | err1: | |
1360 | module_put(type->owner); | |
1361 | return err; | |
96518518 PM |
1362 | } |
1363 | ||
1364 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1365 | const struct nft_expr_info *info, |
96518518 PM |
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) { | |
ef1f7df9 | 1373 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1374 | if (err < 0) |
1375 | goto err1; | |
1376 | } | |
1377 | ||
96518518 PM |
1378 | return 0; |
1379 | ||
1380 | err1: | |
1381 | expr->ops = NULL; | |
1382 | return err; | |
1383 | } | |
1384 | ||
62472bce PM |
1385 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1386 | struct nft_expr *expr) | |
96518518 PM |
1387 | { |
1388 | if (expr->ops->destroy) | |
62472bce | 1389 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1390 | module_put(expr->ops->type->owner); |
96518518 PM |
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 }, | |
0ca743a5 | 1426 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1427 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1428 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1429 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
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; | |
5e948466 EL |
1442 | const struct nft_rule *prule; |
1443 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1444 | |
5e948466 | 1445 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
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 | ||
5e948466 EL |
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 | ||
96518518 PM |
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 | ||
0768b3b3 PNA |
1482 | if (rule->ulen && |
1483 | nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule))) | |
1484 | goto nla_put_failure; | |
1485 | ||
96518518 PM |
1486 | return nlmsg_end(skb, nlh); |
1487 | ||
1488 | nla_put_failure: | |
1489 | nlmsg_trim(skb, nlh); | |
1490 | return -1; | |
1491 | } | |
1492 | ||
35151d84 | 1493 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
96518518 | 1494 | const struct nft_rule *rule, |
35151d84 | 1495 | int event) |
96518518 PM |
1496 | { |
1497 | struct sk_buff *skb; | |
96518518 PM |
1498 | int err; |
1499 | ||
128ad332 PNA |
1500 | if (!ctx->report && |
1501 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1502 | return 0; |
1503 | ||
1504 | err = -ENOBUFS; | |
1505 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1506 | if (skb == NULL) | |
1507 | goto err; | |
1508 | ||
128ad332 | 1509 | err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0, |
35151d84 PNA |
1510 | ctx->afi->family, ctx->table, |
1511 | ctx->chain, rule); | |
96518518 PM |
1512 | if (err < 0) { |
1513 | kfree_skb(skb); | |
1514 | goto err; | |
1515 | } | |
1516 | ||
128ad332 PNA |
1517 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1518 | ctx->report, GFP_KERNEL); | |
96518518 | 1519 | err: |
128ad332 PNA |
1520 | if (err < 0) { |
1521 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1522 | err); | |
1523 | } | |
96518518 PM |
1524 | return err; |
1525 | } | |
1526 | ||
0628b123 PNA |
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 | ||
96518518 PM |
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]; | |
99633ab2 | 1571 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1572 | int family = nfmsg->nfgen_family; |
1573 | ||
e688a7f8 | 1574 | rcu_read_lock(); |
38e029f1 PNA |
1575 | cb->seq = net->nft.base_seq; |
1576 | ||
e688a7f8 | 1577 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
96518518 PM |
1578 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1579 | continue; | |
1580 | ||
e688a7f8 PNA |
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) { | |
0628b123 PNA |
1584 | if (!nft_rule_is_active(net, rule)) |
1585 | goto cont; | |
96518518 PM |
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; | |
38e029f1 PNA |
1597 | |
1598 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); | |
96518518 PM |
1599 | cont: |
1600 | idx++; | |
1601 | } | |
1602 | } | |
1603 | } | |
1604 | } | |
1605 | done: | |
e688a7f8 PNA |
1606 | rcu_read_unlock(); |
1607 | ||
96518518 PM |
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; | |
99633ab2 | 1622 | struct net *net = sock_net(skb->sk); |
96518518 PM |
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 | ||
99633ab2 | 1633 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1634 | if (IS_ERR(afi)) |
1635 | return PTR_ERR(afi); | |
1636 | ||
9370761c | 1637 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1638 | if (IS_ERR(table)) |
1639 | return PTR_ERR(table); | |
55dd6f93 PNA |
1640 | if (table->flags & NFT_TABLE_INACTIVE) |
1641 | return -ENOENT; | |
96518518 PM |
1642 | |
1643 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1644 | if (IS_ERR(chain)) | |
1645 | return PTR_ERR(chain); | |
91c7b38d PNA |
1646 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1647 | return -ENOENT; | |
96518518 PM |
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 | ||
62472bce PM |
1670 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
1671 | struct nft_rule *rule) | |
96518518 | 1672 | { |
96518518 PM |
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)) { | |
62472bce | 1681 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
1682 | expr = nft_expr_next(expr); |
1683 | } | |
1684 | kfree(rule); | |
1685 | } | |
1686 | ||
b380e5c7 | 1687 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, |
1081d11b | 1688 | struct nft_rule *rule) |
0628b123 | 1689 | { |
1081d11b | 1690 | struct nft_trans *trans; |
0628b123 | 1691 | |
b380e5c7 | 1692 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); |
1081d11b PNA |
1693 | if (trans == NULL) |
1694 | return NULL; | |
0628b123 | 1695 | |
1081d11b PNA |
1696 | nft_trans_rule(trans) = rule; |
1697 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
0628b123 | 1698 | |
1081d11b | 1699 | return trans; |
0628b123 PNA |
1700 | } |
1701 | ||
1081d11b PNA |
1702 | #define NFT_RULE_MAXEXPRS 128 |
1703 | ||
1704 | static struct nft_expr_info *info; | |
1705 | ||
96518518 PM |
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); | |
7c95f6d8 | 1711 | struct nft_af_info *afi; |
99633ab2 | 1712 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1713 | struct nft_table *table; |
1714 | struct nft_chain *chain; | |
1715 | struct nft_rule *rule, *old_rule = NULL; | |
1081d11b | 1716 | struct nft_trans *trans = NULL; |
96518518 PM |
1717 | struct nft_expr *expr; |
1718 | struct nft_ctx ctx; | |
1719 | struct nlattr *tmp; | |
0768b3b3 | 1720 | unsigned int size, i, n, ulen = 0; |
96518518 PM |
1721 | int err, rem; |
1722 | bool create; | |
5e948466 | 1723 | u64 handle, pos_handle; |
96518518 PM |
1724 | |
1725 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1726 | ||
99633ab2 | 1727 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
1728 | if (IS_ERR(afi)) |
1729 | return PTR_ERR(afi); | |
1730 | ||
9370761c | 1731 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
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); | |
a0a7379e PNA |
1755 | |
1756 | if (chain->use == UINT_MAX) | |
1757 | return -EOVERFLOW; | |
96518518 PM |
1758 | } |
1759 | ||
5e948466 EL |
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 | ||
0ca743a5 PNA |
1770 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1771 | ||
96518518 PM |
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; | |
0ca743a5 | 1781 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
1782 | if (err < 0) |
1783 | goto err1; | |
1784 | size += info[n].ops->size; | |
1785 | n++; | |
1786 | } | |
1787 | } | |
1788 | ||
0768b3b3 PNA |
1789 | if (nla[NFTA_RULE_USERDATA]) |
1790 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); | |
1791 | ||
96518518 | 1792 | err = -ENOMEM; |
0768b3b3 | 1793 | rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL); |
96518518 PM |
1794 | if (rule == NULL) |
1795 | goto err1; | |
1796 | ||
0628b123 PNA |
1797 | nft_rule_activate_next(net, rule); |
1798 | ||
96518518 PM |
1799 | rule->handle = handle; |
1800 | rule->dlen = size; | |
0768b3b3 PNA |
1801 | rule->ulen = ulen; |
1802 | ||
1803 | if (ulen) | |
1804 | nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen); | |
96518518 | 1805 | |
96518518 PM |
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; | |
ef1f7df9 | 1811 | info[i].ops = NULL; |
96518518 PM |
1812 | expr = nft_expr_next(expr); |
1813 | } | |
1814 | ||
96518518 | 1815 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
0628b123 | 1816 | if (nft_rule_is_active_next(net, old_rule)) { |
ac904ac8 | 1817 | trans = nft_trans_rule_add(&ctx, NFT_MSG_DELRULE, |
b380e5c7 | 1818 | old_rule); |
1081d11b | 1819 | if (trans == NULL) { |
0628b123 PNA |
1820 | err = -ENOMEM; |
1821 | goto err2; | |
1822 | } | |
1823 | nft_rule_disactivate_next(net, old_rule); | |
ac34b861 | 1824 | chain->use--; |
5bc5c307 | 1825 | list_add_tail_rcu(&rule->list, &old_rule->list); |
0628b123 PNA |
1826 | } else { |
1827 | err = -ENOENT; | |
1828 | goto err2; | |
1829 | } | |
96518518 | 1830 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
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 | } | |
96518518 | 1841 | |
b380e5c7 | 1842 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
1843 | err = -ENOMEM; |
1844 | goto err3; | |
1845 | } | |
4fefee57 | 1846 | chain->use++; |
96518518 PM |
1847 | return 0; |
1848 | ||
0628b123 PNA |
1849 | err3: |
1850 | list_del_rcu(&rule->list); | |
1081d11b PNA |
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); | |
ac34b861 | 1855 | chain->use++; |
0628b123 | 1856 | } |
96518518 | 1857 | err2: |
62472bce | 1858 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
1859 | err1: |
1860 | for (i = 0; i < n; i++) { | |
1861 | if (info[i].ops != NULL) | |
ef1f7df9 | 1862 | module_put(info[i].ops->type->owner); |
96518518 PM |
1863 | } |
1864 | return err; | |
1865 | } | |
1866 | ||
0628b123 PNA |
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)) { | |
b380e5c7 | 1872 | if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL) |
0628b123 PNA |
1873 | return -ENOMEM; |
1874 | nft_rule_disactivate_next(ctx->net, rule); | |
4fefee57 | 1875 | ctx->chain->use--; |
0628b123 PNA |
1876 | return 0; |
1877 | } | |
1878 | return -ENOENT; | |
1879 | } | |
1880 | ||
cf9dc09d PNA |
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 | ||
96518518 PM |
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); | |
7c95f6d8 | 1899 | struct nft_af_info *afi; |
99633ab2 | 1900 | struct net *net = sock_net(skb->sk); |
7c95f6d8 | 1901 | struct nft_table *table; |
cf9dc09d PNA |
1902 | struct nft_chain *chain = NULL; |
1903 | struct nft_rule *rule; | |
0628b123 PNA |
1904 | int family = nfmsg->nfgen_family, err = 0; |
1905 | struct nft_ctx ctx; | |
96518518 | 1906 | |
99633ab2 | 1907 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1908 | if (IS_ERR(afi)) |
1909 | return PTR_ERR(afi); | |
1910 | ||
9370761c | 1911 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1912 | if (IS_ERR(table)) |
1913 | return PTR_ERR(table); | |
55dd6f93 PNA |
1914 | if (table->flags & NFT_TABLE_INACTIVE) |
1915 | return -ENOENT; | |
96518518 | 1916 | |
cf9dc09d PNA |
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 | } | |
96518518 | 1922 | |
0628b123 PNA |
1923 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1924 | ||
cf9dc09d PNA |
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); | |
96518518 | 1931 | |
0628b123 | 1932 | err = nf_tables_delrule_one(&ctx, rule); |
cf9dc09d PNA |
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); | |
0628b123 PNA |
1940 | if (err < 0) |
1941 | break; | |
1942 | } | |
1943 | } | |
1944 | ||
1945 | return err; | |
1946 | } | |
1947 | ||
20a69341 PM |
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); | |
e688a7f8 | 1957 | list_add_tail_rcu(&ops->list, &nf_tables_set_ops); |
20a69341 PM |
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); | |
e688a7f8 | 1966 | list_del_rcu(&ops->list); |
20a69341 PM |
1967 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1968 | } | |
1969 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
1970 | ||
c50b960c PM |
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) | |
20a69341 | 1980 | { |
c50b960c PM |
1981 | const struct nft_set_ops *ops, *bops; |
1982 | struct nft_set_estimate est, best; | |
20a69341 PM |
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 | ||
c50b960c PM |
2000 | bops = NULL; |
2001 | best.size = ~0; | |
2002 | best.class = ~0; | |
2003 | ||
20a69341 PM |
2004 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
2005 | if ((ops->features & features) != features) | |
2006 | continue; | |
c50b960c PM |
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 | ||
20a69341 PM |
2027 | if (!try_module_get(ops->owner)) |
2028 | continue; | |
c50b960c PM |
2029 | if (bops != NULL) |
2030 | module_put(bops->owner); | |
2031 | ||
2032 | bops = ops; | |
2033 | best = est; | |
20a69341 PM |
2034 | } |
2035 | ||
c50b960c PM |
2036 | if (bops != NULL) |
2037 | return bops; | |
2038 | ||
20a69341 PM |
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 }, | |
a9bdd836 PNA |
2044 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
2045 | .len = IFNAMSIZ - 1 }, | |
20a69341 PM |
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 }, | |
c50b960c PM |
2051 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2052 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2053 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
c50b960c PM |
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 }, | |
20a69341 PM |
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 | { | |
99633ab2 | 2065 | struct net *net = sock_net(skb->sk); |
20a69341 | 2066 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7c95f6d8 PNA |
2067 | struct nft_af_info *afi = NULL; |
2068 | struct nft_table *table = NULL; | |
20a69341 | 2069 | |
c9c8e485 PNA |
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 | } | |
20a69341 PM |
2075 | |
2076 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2077 | if (afi == NULL) |
2078 | return -EAFNOSUPPORT; | |
2079 | ||
9370761c | 2080 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2081 | if (IS_ERR(table)) |
2082 | return PTR_ERR(table); | |
55dd6f93 PNA |
2083 | if (table->flags & NFT_TABLE_INACTIVE) |
2084 | return -ENOENT; | |
20a69341 PM |
2085 | } |
2086 | ||
0ca743a5 | 2087 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
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 | ||
958bee14 PNA |
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 | ||
20a69341 PM |
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; | |
60eb1894 | 2126 | unsigned int n = 0, min = 0; |
20a69341 PM |
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; | |
60eb1894 | 2136 | cont: |
20a69341 | 2137 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2138 | int tmp; |
2139 | ||
2140 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 2141 | continue; |
60eb1894 | 2142 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2143 | continue; |
14662917 | 2144 | |
60eb1894 | 2145 | set_bit(tmp - min, inuse); |
20a69341 PM |
2146 | } |
2147 | ||
53b70287 | 2148 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
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 | } | |
20a69341 PM |
2154 | free_page((unsigned long)inuse); |
2155 | } | |
2156 | ||
60eb1894 | 2157 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 PM |
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; | |
c50b960c | 2170 | struct nlattr *desc; |
128ad332 PNA |
2171 | u32 portid = ctx->portid; |
2172 | u32 seq = ctx->seq; | |
20a69341 PM |
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 | ||
c50b960c PM |
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 | ||
20a69341 PM |
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, | |
31f8441c | 2221 | int event, gfp_t gfp_flags) |
20a69341 PM |
2222 | { |
2223 | struct sk_buff *skb; | |
128ad332 | 2224 | u32 portid = ctx->portid; |
20a69341 PM |
2225 | int err; |
2226 | ||
128ad332 PNA |
2227 | if (!ctx->report && |
2228 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
20a69341 PM |
2229 | return 0; |
2230 | ||
2231 | err = -ENOBUFS; | |
31f8441c | 2232 | skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); |
20a69341 PM |
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 | ||
128ad332 | 2242 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
31f8441c | 2243 | ctx->report, gfp_flags); |
20a69341 PM |
2244 | err: |
2245 | if (err < 0) | |
99633ab2 | 2246 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
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 | ||
e688a7f8 | 2259 | rcu_read_lock(); |
38e029f1 PNA |
2260 | cb->seq = ctx->net->nft.base_seq; |
2261 | ||
e688a7f8 | 2262 | list_for_each_entry_rcu(set, &ctx->table->sets, list) { |
20a69341 PM |
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 | } | |
38e029f1 | 2270 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
20a69341 PM |
2271 | cont: |
2272 | idx++; | |
2273 | } | |
2274 | cb->args[1] = 1; | |
2275 | done: | |
e688a7f8 | 2276 | rcu_read_unlock(); |
20a69341 PM |
2277 | return skb->len; |
2278 | } | |
2279 | ||
c9c8e485 PNA |
2280 | static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb, |
2281 | struct netlink_callback *cb) | |
20a69341 PM |
2282 | { |
2283 | const struct nft_set *set; | |
e38195bf | 2284 | unsigned int idx, s_idx = cb->args[0]; |
20a69341 PM |
2285 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2286 | ||
2287 | if (cb->args[1]) | |
2288 | return skb->len; | |
2289 | ||
e688a7f8 | 2290 | rcu_read_lock(); |
38e029f1 PNA |
2291 | cb->seq = ctx->net->nft.base_seq; |
2292 | ||
e688a7f8 | 2293 | list_for_each_entry_rcu(table, &ctx->afi->tables, list) { |
e38195bf PNA |
2294 | if (cur_table) { |
2295 | if (cur_table != table) | |
2296 | continue; | |
20a69341 | 2297 | |
e38195bf PNA |
2298 | cur_table = NULL; |
2299 | } | |
20a69341 | 2300 | ctx->table = table; |
e38195bf | 2301 | idx = 0; |
e688a7f8 | 2302 | list_for_each_entry_rcu(set, &ctx->table->sets, list) { |
20a69341 PM |
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 | } | |
38e029f1 | 2311 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
20a69341 PM |
2312 | cont: |
2313 | idx++; | |
2314 | } | |
2315 | } | |
2316 | cb->args[1] = 1; | |
2317 | done: | |
e688a7f8 | 2318 | rcu_read_unlock(); |
20a69341 PM |
2319 | return skb->len; |
2320 | } | |
2321 | ||
c9c8e485 PNA |
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]; | |
7c95f6d8 | 2327 | struct nft_af_info *afi; |
c9c8e485 PNA |
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 | ||
e688a7f8 | 2335 | rcu_read_lock(); |
38e029f1 PNA |
2336 | cb->seq = net->nft.base_seq; |
2337 | ||
e688a7f8 | 2338 | list_for_each_entry_rcu(afi, &net->nft.af_info, list) { |
c9c8e485 PNA |
2339 | if (cur_family) { |
2340 | if (afi->family != cur_family) | |
2341 | continue; | |
2342 | ||
2343 | cur_family = 0; | |
2344 | } | |
2345 | ||
e688a7f8 | 2346 | list_for_each_entry_rcu(table, &afi->tables, list) { |
c9c8e485 PNA |
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; | |
e688a7f8 | 2357 | list_for_each_entry_rcu(set, &ctx->table->sets, list) { |
c9c8e485 PNA |
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 | } | |
38e029f1 | 2368 | nl_dump_check_consistent(cb, nlmsg_hdr(skb)); |
c9c8e485 PNA |
2369 | cont: |
2370 | idx++; | |
2371 | } | |
2372 | if (s_idx) | |
2373 | s_idx = 0; | |
2374 | } | |
2375 | } | |
2376 | cb->args[1] = 1; | |
2377 | done: | |
e688a7f8 | 2378 | rcu_read_unlock(); |
c9c8e485 PNA |
2379 | return skb->len; |
2380 | } | |
2381 | ||
20a69341 PM |
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 | ||
c9c8e485 PNA |
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 | |
20a69341 PM |
2404 | ret = nf_tables_dump_sets_table(&ctx, skb, cb); |
2405 | ||
2406 | return ret; | |
2407 | } | |
2408 | ||
958bee14 PNA |
2409 | #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */ |
2410 | ||
20a69341 PM |
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; | |
c9c8e485 | 2418 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
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 | ||
c9c8e485 PNA |
2433 | /* Only accept unspec with dump */ |
2434 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2435 | return -EAFNOSUPPORT; | |
2436 | ||
20a69341 PM |
2437 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2438 | if (IS_ERR(set)) | |
2439 | return PTR_ERR(set); | |
958bee14 PNA |
2440 | if (set->flags & NFT_SET_INACTIVE) |
2441 | return -ENOENT; | |
20a69341 PM |
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 | ||
c50b960c PM |
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 | ||
958bee14 PNA |
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 | ||
20a69341 PM |
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; | |
7c95f6d8 | 2501 | struct nft_af_info *afi; |
99633ab2 | 2502 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
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; | |
c50b960c PM |
2509 | u32 ktype, dtype, flags, policy; |
2510 | struct nft_set_desc desc; | |
20a69341 PM |
2511 | int err; |
2512 | ||
2513 | if (nla[NFTA_SET_TABLE] == NULL || | |
2514 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2515 | nla[NFTA_SET_KEY_LEN] == NULL || |
2516 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2517 | return -EINVAL; |
2518 | ||
c50b960c PM |
2519 | memset(&desc, 0, sizeof(desc)); |
2520 | ||
20a69341 PM |
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 | ||
c50b960c PM |
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)) | |
20a69341 PM |
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; | |
20a69341 PM |
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; | |
c50b960c PM |
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)) | |
20a69341 PM |
2556 | return -EINVAL; |
2557 | } else | |
c50b960c | 2558 | desc.dlen = sizeof(struct nft_data); |
20a69341 PM |
2559 | } else if (flags & NFT_SET_MAP) |
2560 | return -EINVAL; | |
2561 | ||
c50b960c PM |
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 | ||
20a69341 PM |
2572 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2573 | ||
99633ab2 | 2574 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2575 | if (IS_ERR(afi)) |
2576 | return PTR_ERR(afi); | |
2577 | ||
9370761c | 2578 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2579 | if (IS_ERR(table)) |
2580 | return PTR_ERR(table); | |
2581 | ||
0ca743a5 | 2582 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
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 | ||
c50b960c | 2602 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
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; | |
c50b960c | 2623 | set->klen = desc.klen; |
20a69341 | 2624 | set->dtype = dtype; |
c50b960c | 2625 | set->dlen = desc.dlen; |
20a69341 | 2626 | set->flags = flags; |
c50b960c | 2627 | set->size = desc.size; |
20a69341 | 2628 | |
c50b960c | 2629 | err = ops->init(set, &desc, nla); |
20a69341 PM |
2630 | if (err < 0) |
2631 | goto err2; | |
2632 | ||
958bee14 | 2633 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 PM |
2634 | if (err < 0) |
2635 | goto err2; | |
2636 | ||
e688a7f8 | 2637 | list_add_tail_rcu(&set->list, &table->sets); |
4fefee57 | 2638 | table->use++; |
20a69341 PM |
2639 | return 0; |
2640 | ||
2641 | err2: | |
2642 | kfree(set); | |
2643 | err1: | |
2644 | module_put(ops->owner); | |
2645 | return err; | |
2646 | } | |
2647 | ||
958bee14 | 2648 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 2649 | { |
20a69341 PM |
2650 | set->ops->destroy(set); |
2651 | module_put(set->ops->owner); | |
2652 | kfree(set); | |
2653 | } | |
2654 | ||
958bee14 PNA |
2655 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
2656 | { | |
e688a7f8 | 2657 | list_del_rcu(&set->list); |
31f8441c | 2658 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, GFP_ATOMIC); |
958bee14 PNA |
2659 | nft_set_destroy(set); |
2660 | } | |
2661 | ||
20a69341 PM |
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 | { | |
c9c8e485 | 2666 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2667 | struct nft_set *set; |
2668 | struct nft_ctx ctx; | |
2669 | int err; | |
2670 | ||
ec2c9935 PM |
2671 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2672 | return -EAFNOSUPPORT; | |
20a69341 PM |
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); | |
958bee14 PNA |
2683 | if (set->flags & NFT_SET_INACTIVE) |
2684 | return -ENOENT; | |
20a69341 PM |
2685 | if (!list_empty(&set->bindings)) |
2686 | return -EBUSY; | |
2687 | ||
958bee14 PNA |
2688 | err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set); |
2689 | if (err < 0) | |
2690 | return err; | |
2691 | ||
e688a7f8 | 2692 | list_del_rcu(&set->list); |
4fefee57 | 2693 | ctx.table->use--; |
20a69341 PM |
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); | |
2ee0d3c8 PNA |
2705 | return nft_validate_data_load(ctx, dreg, &elem->data, |
2706 | set->dtype == NFT_DATA_VERDICT ? | |
2707 | NFT_DATA_VERDICT : NFT_DATA_VALUE); | |
20a69341 PM |
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; | |
e688a7f8 | 2744 | list_add_tail_rcu(&binding->list, &set->bindings); |
20a69341 PM |
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 | { | |
e688a7f8 | 2751 | list_del_rcu(&binding->list); |
20a69341 | 2752 | |
958bee14 PNA |
2753 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
2754 | !(set->flags & NFT_SET_INACTIVE)) | |
20a69341 PM |
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 }, | |
958bee14 | 2772 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
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, | |
55dd6f93 PNA |
2778 | const struct nlattr * const nla[], |
2779 | bool trans) | |
20a69341 PM |
2780 | { |
2781 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2782 | struct nft_af_info *afi; |
2783 | struct nft_table *table; | |
99633ab2 | 2784 | struct net *net = sock_net(skb->sk); |
20a69341 | 2785 | |
99633ab2 | 2786 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
2787 | if (IS_ERR(afi)) |
2788 | return PTR_ERR(afi); | |
2789 | ||
9370761c | 2790 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2791 | if (IS_ERR(table)) |
2792 | return PTR_ERR(table); | |
55dd6f93 PNA |
2793 | if (!trans && (table->flags & NFT_TABLE_INACTIVE)) |
2794 | return -ENOENT; | |
20a69341 | 2795 | |
0ca743a5 | 2796 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
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 | ||
720e0dfa MN |
2863 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
2864 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
2865 | if (err < 0) |
2866 | return err; | |
2867 | ||
55dd6f93 PNA |
2868 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla, |
2869 | false); | |
20a69341 PM |
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); | |
958bee14 PNA |
2876 | if (set->flags & NFT_SET_INACTIVE) |
2877 | return -ENOENT; | |
20a69341 PM |
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); | |
6403d962 | 2890 | nfmsg->nfgen_family = ctx.afi->family; |
20a69341 PM |
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 | ||
55dd6f93 | 2934 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
20a69341 PM |
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); | |
958bee14 PNA |
2941 | if (set->flags & NFT_SET_INACTIVE) |
2942 | return -ENOENT; | |
20a69341 PM |
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 | ||
d60ce62f AB |
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 | { | |
128ad332 PNA |
3002 | struct net *net = ctx->net; |
3003 | u32 portid = ctx->portid; | |
d60ce62f AB |
3004 | struct sk_buff *skb; |
3005 | int err; | |
3006 | ||
128ad332 | 3007 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
d60ce62f AB |
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 | ||
128ad332 | 3022 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
d60ce62f AB |
3023 | GFP_KERNEL); |
3024 | err: | |
3025 | if (err < 0) | |
3026 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
3027 | return err; | |
3028 | } | |
3029 | ||
60319eb1 PNA |
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, | |
20a69341 PM |
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; | |
60319eb1 | 3052 | struct nft_trans *trans; |
20a69341 PM |
3053 | int err; |
3054 | ||
c50b960c PM |
3055 | if (set->size && set->nelems == set->size) |
3056 | return -ENFILE; | |
3057 | ||
20a69341 PM |
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; | |
bd7fc645 PNA |
3077 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
3078 | elem.flags & NFT_SET_ELEM_INTERVAL_END) | |
3079 | return -EINVAL; | |
20a69341 PM |
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, | |
7c95f6d8 | 3110 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
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 | ||
60319eb1 PNA |
3120 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3121 | if (trans == NULL) | |
3122 | goto err3; | |
3123 | ||
20a69341 PM |
3124 | err = set->ops->insert(set, &elem); |
3125 | if (err < 0) | |
60319eb1 | 3126 | goto err4; |
20a69341 | 3127 | |
60319eb1 | 3128 | nft_trans_elem(trans) = elem; |
46bbafce | 3129 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3130 | return 0; |
3131 | ||
60319eb1 PNA |
3132 | err4: |
3133 | kfree(trans); | |
20a69341 PM |
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 | { | |
958bee14 | 3147 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
3148 | const struct nlattr *attr; |
3149 | struct nft_set *set; | |
3150 | struct nft_ctx ctx; | |
60319eb1 | 3151 | int rem, err = 0; |
20a69341 | 3152 | |
55dd6f93 | 3153 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true); |
20a69341 PM |
3154 | if (err < 0) |
3155 | return err; | |
3156 | ||
3157 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
958bee14 PNA |
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 | ||
20a69341 PM |
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) | |
60319eb1 | 3173 | break; |
4fefee57 PNA |
3174 | |
3175 | set->nelems++; | |
20a69341 | 3176 | } |
60319eb1 | 3177 | return err; |
20a69341 PM |
3178 | } |
3179 | ||
60319eb1 | 3180 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
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; | |
60319eb1 | 3186 | struct nft_trans *trans; |
20a69341 PM |
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 | ||
60319eb1 PNA |
3210 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
3211 | if (trans == NULL) | |
3212 | goto err2; | |
20a69341 | 3213 | |
60319eb1 | 3214 | nft_trans_elem(trans) = elem; |
46bbafce | 3215 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
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 | err2: | |
3222 | nft_data_uninit(&elem.key, desc.type); | |
3223 | err1: | |
3224 | return err; | |
3225 | } | |
3226 | ||
3227 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3228 | const struct nlmsghdr *nlh, | |
3229 | const struct nlattr * const nla[]) | |
3230 | { | |
3231 | const struct nlattr *attr; | |
3232 | struct nft_set *set; | |
3233 | struct nft_ctx ctx; | |
60319eb1 | 3234 | int rem, err = 0; |
20a69341 | 3235 | |
55dd6f93 | 3236 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
20a69341 PM |
3237 | if (err < 0) |
3238 | return err; | |
3239 | ||
3240 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3241 | if (IS_ERR(set)) | |
3242 | return PTR_ERR(set); | |
3243 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3244 | return -EBUSY; | |
3245 | ||
3246 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3247 | err = nft_del_setelem(&ctx, set, attr); | |
3248 | if (err < 0) | |
60319eb1 | 3249 | break; |
4fefee57 PNA |
3250 | |
3251 | set->nelems--; | |
20a69341 | 3252 | } |
60319eb1 | 3253 | return err; |
20a69341 PM |
3254 | } |
3255 | ||
96518518 PM |
3256 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
3257 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 3258 | .call_batch = nf_tables_newtable, |
96518518 PM |
3259 | .attr_count = NFTA_TABLE_MAX, |
3260 | .policy = nft_table_policy, | |
3261 | }, | |
3262 | [NFT_MSG_GETTABLE] = { | |
3263 | .call = nf_tables_gettable, | |
3264 | .attr_count = NFTA_TABLE_MAX, | |
3265 | .policy = nft_table_policy, | |
3266 | }, | |
3267 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 3268 | .call_batch = nf_tables_deltable, |
96518518 PM |
3269 | .attr_count = NFTA_TABLE_MAX, |
3270 | .policy = nft_table_policy, | |
3271 | }, | |
3272 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 3273 | .call_batch = nf_tables_newchain, |
96518518 PM |
3274 | .attr_count = NFTA_CHAIN_MAX, |
3275 | .policy = nft_chain_policy, | |
3276 | }, | |
3277 | [NFT_MSG_GETCHAIN] = { | |
3278 | .call = nf_tables_getchain, | |
3279 | .attr_count = NFTA_CHAIN_MAX, | |
3280 | .policy = nft_chain_policy, | |
3281 | }, | |
3282 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 3283 | .call_batch = nf_tables_delchain, |
96518518 PM |
3284 | .attr_count = NFTA_CHAIN_MAX, |
3285 | .policy = nft_chain_policy, | |
3286 | }, | |
3287 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 3288 | .call_batch = nf_tables_newrule, |
96518518 PM |
3289 | .attr_count = NFTA_RULE_MAX, |
3290 | .policy = nft_rule_policy, | |
3291 | }, | |
3292 | [NFT_MSG_GETRULE] = { | |
3293 | .call = nf_tables_getrule, | |
3294 | .attr_count = NFTA_RULE_MAX, | |
3295 | .policy = nft_rule_policy, | |
3296 | }, | |
3297 | [NFT_MSG_DELRULE] = { | |
0628b123 | 3298 | .call_batch = nf_tables_delrule, |
96518518 PM |
3299 | .attr_count = NFTA_RULE_MAX, |
3300 | .policy = nft_rule_policy, | |
3301 | }, | |
20a69341 | 3302 | [NFT_MSG_NEWSET] = { |
958bee14 | 3303 | .call_batch = nf_tables_newset, |
20a69341 PM |
3304 | .attr_count = NFTA_SET_MAX, |
3305 | .policy = nft_set_policy, | |
3306 | }, | |
3307 | [NFT_MSG_GETSET] = { | |
3308 | .call = nf_tables_getset, | |
3309 | .attr_count = NFTA_SET_MAX, | |
3310 | .policy = nft_set_policy, | |
3311 | }, | |
3312 | [NFT_MSG_DELSET] = { | |
958bee14 | 3313 | .call_batch = nf_tables_delset, |
20a69341 PM |
3314 | .attr_count = NFTA_SET_MAX, |
3315 | .policy = nft_set_policy, | |
3316 | }, | |
3317 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 3318 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
3319 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3320 | .policy = nft_set_elem_list_policy, | |
3321 | }, | |
3322 | [NFT_MSG_GETSETELEM] = { | |
3323 | .call = nf_tables_getsetelem, | |
3324 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3325 | .policy = nft_set_elem_list_policy, | |
3326 | }, | |
3327 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 3328 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
3329 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3330 | .policy = nft_set_elem_list_policy, | |
3331 | }, | |
96518518 PM |
3332 | }; |
3333 | ||
91c7b38d PNA |
3334 | static void nft_chain_commit_update(struct nft_trans *trans) |
3335 | { | |
3336 | struct nft_base_chain *basechain; | |
3337 | ||
3338 | if (nft_trans_chain_name(trans)[0]) | |
3339 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
3340 | ||
3341 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) | |
3342 | return; | |
3343 | ||
3344 | basechain = nft_base_chain(trans->ctx.chain); | |
3345 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
3346 | ||
3347 | switch (nft_trans_chain_policy(trans)) { | |
3348 | case NF_DROP: | |
3349 | case NF_ACCEPT: | |
3350 | basechain->policy = nft_trans_chain_policy(trans); | |
3351 | break; | |
3352 | } | |
3353 | } | |
3354 | ||
c7c32e72 PNA |
3355 | /* Schedule objects for release via rcu to make sure no packets are accesing |
3356 | * removed rules. | |
3357 | */ | |
3358 | static void nf_tables_commit_release_rcu(struct rcu_head *rt) | |
3359 | { | |
3360 | struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head); | |
3361 | ||
3362 | switch (trans->msg_type) { | |
3363 | case NFT_MSG_DELTABLE: | |
3364 | nf_tables_table_destroy(&trans->ctx); | |
3365 | break; | |
3366 | case NFT_MSG_DELCHAIN: | |
3367 | nf_tables_chain_destroy(trans->ctx.chain); | |
3368 | break; | |
3369 | case NFT_MSG_DELRULE: | |
3370 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3371 | break; | |
3372 | case NFT_MSG_DELSET: | |
3373 | nft_set_destroy(nft_trans_set(trans)); | |
3374 | break; | |
3375 | } | |
3376 | kfree(trans); | |
3377 | } | |
3378 | ||
37082f93 PNA |
3379 | static int nf_tables_commit(struct sk_buff *skb) |
3380 | { | |
3381 | struct net *net = sock_net(skb->sk); | |
3382 | struct nft_trans *trans, *next; | |
60319eb1 | 3383 | struct nft_set *set; |
37082f93 PNA |
3384 | |
3385 | /* Bump generation counter, invalidate any dump in progress */ | |
38e029f1 | 3386 | while (++net->nft.base_seq == 0); |
37082f93 PNA |
3387 | |
3388 | /* A new generation has just started */ | |
3389 | net->nft.gencursor = gencursor_next(net); | |
3390 | ||
3391 | /* Make sure all packets have left the previous generation before | |
3392 | * purging old rules. | |
3393 | */ | |
3394 | synchronize_rcu(); | |
3395 | ||
3396 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3397 | switch (trans->msg_type) { |
55dd6f93 PNA |
3398 | case NFT_MSG_NEWTABLE: |
3399 | if (nft_trans_table_update(trans)) { | |
3400 | if (!nft_trans_table_enable(trans)) { | |
3401 | nf_tables_table_disable(trans->ctx.afi, | |
3402 | trans->ctx.table); | |
3403 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3404 | } | |
3405 | } else { | |
3406 | trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE; | |
3407 | } | |
35151d84 | 3408 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
3409 | nft_trans_destroy(trans); |
3410 | break; | |
3411 | case NFT_MSG_DELTABLE: | |
35151d84 | 3412 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 3413 | break; |
91c7b38d PNA |
3414 | case NFT_MSG_NEWCHAIN: |
3415 | if (nft_trans_chain_update(trans)) | |
3416 | nft_chain_commit_update(trans); | |
4fefee57 | 3417 | else |
91c7b38d | 3418 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; |
4fefee57 | 3419 | |
35151d84 | 3420 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
3421 | nft_trans_destroy(trans); |
3422 | break; | |
3423 | case NFT_MSG_DELCHAIN: | |
35151d84 | 3424 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
91c7b38d PNA |
3425 | if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) && |
3426 | trans->ctx.chain->flags & NFT_BASE_CHAIN) { | |
3427 | nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops, | |
3428 | trans->ctx.afi->nops); | |
3429 | } | |
3430 | break; | |
b380e5c7 PNA |
3431 | case NFT_MSG_NEWRULE: |
3432 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); | |
35151d84 | 3433 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 3434 | nft_trans_rule(trans), |
35151d84 | 3435 | NFT_MSG_NEWRULE); |
37082f93 | 3436 | nft_trans_destroy(trans); |
b380e5c7 PNA |
3437 | break; |
3438 | case NFT_MSG_DELRULE: | |
3439 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
3440 | nf_tables_rule_notify(&trans->ctx, |
3441 | nft_trans_rule(trans), | |
3442 | NFT_MSG_DELRULE); | |
b380e5c7 | 3443 | break; |
958bee14 PNA |
3444 | case NFT_MSG_NEWSET: |
3445 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; | |
4fefee57 PNA |
3446 | /* This avoids hitting -EBUSY when deleting the table |
3447 | * from the transaction. | |
3448 | */ | |
3449 | if (nft_trans_set(trans)->flags & NFT_SET_ANONYMOUS && | |
3450 | !list_empty(&nft_trans_set(trans)->bindings)) | |
3451 | trans->ctx.table->use--; | |
3452 | ||
958bee14 | 3453 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), |
31f8441c | 3454 | NFT_MSG_NEWSET, GFP_KERNEL); |
958bee14 PNA |
3455 | nft_trans_destroy(trans); |
3456 | break; | |
3457 | case NFT_MSG_DELSET: | |
3458 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), | |
31f8441c | 3459 | NFT_MSG_DELSET, GFP_KERNEL); |
958bee14 | 3460 | break; |
60319eb1 | 3461 | case NFT_MSG_NEWSETELEM: |
60319eb1 PNA |
3462 | nf_tables_setelem_notify(&trans->ctx, |
3463 | nft_trans_elem_set(trans), | |
3464 | &nft_trans_elem(trans), | |
3465 | NFT_MSG_NEWSETELEM, 0); | |
3466 | nft_trans_destroy(trans); | |
3467 | break; | |
3468 | case NFT_MSG_DELSETELEM: | |
60319eb1 PNA |
3469 | nf_tables_setelem_notify(&trans->ctx, |
3470 | nft_trans_elem_set(trans), | |
3471 | &nft_trans_elem(trans), | |
3472 | NFT_MSG_DELSETELEM, 0); | |
3473 | set = nft_trans_elem_set(trans); | |
3474 | set->ops->get(set, &nft_trans_elem(trans)); | |
3475 | set->ops->remove(set, &nft_trans_elem(trans)); | |
3476 | nft_trans_destroy(trans); | |
3477 | break; | |
37082f93 | 3478 | } |
37082f93 PNA |
3479 | } |
3480 | ||
37082f93 | 3481 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 PNA |
3482 | list_del(&trans->list); |
3483 | trans->ctx.nla = NULL; | |
3484 | call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu); | |
37082f93 PNA |
3485 | } |
3486 | ||
3487 | return 0; | |
3488 | } | |
3489 | ||
c7c32e72 PNA |
3490 | /* Schedule objects for release via rcu to make sure no packets are accesing |
3491 | * aborted rules. | |
3492 | */ | |
3493 | static void nf_tables_abort_release_rcu(struct rcu_head *rt) | |
3494 | { | |
3495 | struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head); | |
3496 | ||
3497 | switch (trans->msg_type) { | |
3498 | case NFT_MSG_NEWTABLE: | |
3499 | nf_tables_table_destroy(&trans->ctx); | |
3500 | break; | |
3501 | case NFT_MSG_NEWCHAIN: | |
3502 | nf_tables_chain_destroy(trans->ctx.chain); | |
3503 | break; | |
3504 | case NFT_MSG_NEWRULE: | |
3505 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3506 | break; | |
3507 | case NFT_MSG_NEWSET: | |
3508 | nft_set_destroy(nft_trans_set(trans)); | |
3509 | break; | |
3510 | } | |
3511 | kfree(trans); | |
3512 | } | |
3513 | ||
37082f93 PNA |
3514 | static int nf_tables_abort(struct sk_buff *skb) |
3515 | { | |
3516 | struct net *net = sock_net(skb->sk); | |
3517 | struct nft_trans *trans, *next; | |
60319eb1 | 3518 | struct nft_set *set; |
37082f93 PNA |
3519 | |
3520 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3521 | switch (trans->msg_type) { |
55dd6f93 PNA |
3522 | case NFT_MSG_NEWTABLE: |
3523 | if (nft_trans_table_update(trans)) { | |
3524 | if (nft_trans_table_enable(trans)) { | |
3525 | nf_tables_table_disable(trans->ctx.afi, | |
3526 | trans->ctx.table); | |
3527 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3528 | } | |
3529 | nft_trans_destroy(trans); | |
3530 | } else { | |
e688a7f8 | 3531 | list_del_rcu(&trans->ctx.table->list); |
55dd6f93 PNA |
3532 | } |
3533 | break; | |
3534 | case NFT_MSG_DELTABLE: | |
e688a7f8 PNA |
3535 | list_add_tail_rcu(&trans->ctx.table->list, |
3536 | &trans->ctx.afi->tables); | |
55dd6f93 PNA |
3537 | nft_trans_destroy(trans); |
3538 | break; | |
91c7b38d PNA |
3539 | case NFT_MSG_NEWCHAIN: |
3540 | if (nft_trans_chain_update(trans)) { | |
3541 | if (nft_trans_chain_stats(trans)) | |
3542 | free_percpu(nft_trans_chain_stats(trans)); | |
3543 | ||
3544 | nft_trans_destroy(trans); | |
3545 | } else { | |
4fefee57 | 3546 | trans->ctx.table->use--; |
e688a7f8 | 3547 | list_del_rcu(&trans->ctx.chain->list); |
91c7b38d PNA |
3548 | if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) && |
3549 | trans->ctx.chain->flags & NFT_BASE_CHAIN) { | |
3550 | nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops, | |
3551 | trans->ctx.afi->nops); | |
3552 | } | |
3553 | } | |
3554 | break; | |
3555 | case NFT_MSG_DELCHAIN: | |
4fefee57 | 3556 | trans->ctx.table->use++; |
e688a7f8 PNA |
3557 | list_add_tail_rcu(&trans->ctx.chain->list, |
3558 | &trans->ctx.table->chains); | |
91c7b38d PNA |
3559 | nft_trans_destroy(trans); |
3560 | break; | |
b380e5c7 | 3561 | case NFT_MSG_NEWRULE: |
4fefee57 | 3562 | trans->ctx.chain->use--; |
b380e5c7 PNA |
3563 | list_del_rcu(&nft_trans_rule(trans)->list); |
3564 | break; | |
3565 | case NFT_MSG_DELRULE: | |
4fefee57 | 3566 | trans->ctx.chain->use++; |
b380e5c7 | 3567 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); |
37082f93 | 3568 | nft_trans_destroy(trans); |
b380e5c7 | 3569 | break; |
958bee14 | 3570 | case NFT_MSG_NEWSET: |
4fefee57 | 3571 | trans->ctx.table->use--; |
e688a7f8 | 3572 | list_del_rcu(&nft_trans_set(trans)->list); |
958bee14 PNA |
3573 | break; |
3574 | case NFT_MSG_DELSET: | |
4fefee57 | 3575 | trans->ctx.table->use++; |
e688a7f8 PNA |
3576 | list_add_tail_rcu(&nft_trans_set(trans)->list, |
3577 | &trans->ctx.table->sets); | |
958bee14 PNA |
3578 | nft_trans_destroy(trans); |
3579 | break; | |
60319eb1 | 3580 | case NFT_MSG_NEWSETELEM: |
4fefee57 | 3581 | nft_trans_elem_set(trans)->nelems--; |
60319eb1 PNA |
3582 | set = nft_trans_elem_set(trans); |
3583 | set->ops->get(set, &nft_trans_elem(trans)); | |
3584 | set->ops->remove(set, &nft_trans_elem(trans)); | |
3585 | nft_trans_destroy(trans); | |
3586 | break; | |
3587 | case NFT_MSG_DELSETELEM: | |
4fefee57 | 3588 | nft_trans_elem_set(trans)->nelems++; |
60319eb1 PNA |
3589 | nft_trans_destroy(trans); |
3590 | break; | |
37082f93 | 3591 | } |
37082f93 PNA |
3592 | } |
3593 | ||
a1cee076 PNA |
3594 | list_for_each_entry_safe_reverse(trans, next, |
3595 | &net->nft.commit_list, list) { | |
c7c32e72 PNA |
3596 | list_del(&trans->list); |
3597 | trans->ctx.nla = NULL; | |
3598 | call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu); | |
37082f93 PNA |
3599 | } |
3600 | ||
3601 | return 0; | |
3602 | } | |
3603 | ||
96518518 PM |
3604 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
3605 | .name = "nf_tables", | |
3606 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
3607 | .cb_count = NFT_MSG_MAX, | |
3608 | .cb = nf_tables_cb, | |
0628b123 PNA |
3609 | .commit = nf_tables_commit, |
3610 | .abort = nf_tables_abort, | |
96518518 PM |
3611 | }; |
3612 | ||
20a69341 PM |
3613 | /* |
3614 | * Loop detection - walk through the ruleset beginning at the destination chain | |
3615 | * of a new jump until either the source chain is reached (loop) or all | |
3616 | * reachable chains have been traversed. | |
3617 | * | |
3618 | * The loop check is performed whenever a new jump verdict is added to an | |
3619 | * expression or verdict map or a verdict map is bound to a new chain. | |
3620 | */ | |
3621 | ||
3622 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
3623 | const struct nft_chain *chain); | |
3624 | ||
3625 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
3626 | const struct nft_set *set, | |
3627 | const struct nft_set_iter *iter, | |
3628 | const struct nft_set_elem *elem) | |
3629 | { | |
62f9c8b4 PNA |
3630 | if (elem->flags & NFT_SET_ELEM_INTERVAL_END) |
3631 | return 0; | |
3632 | ||
20a69341 PM |
3633 | switch (elem->data.verdict) { |
3634 | case NFT_JUMP: | |
3635 | case NFT_GOTO: | |
3636 | return nf_tables_check_loops(ctx, elem->data.chain); | |
3637 | default: | |
3638 | return 0; | |
3639 | } | |
3640 | } | |
3641 | ||
3642 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
3643 | const struct nft_chain *chain) | |
3644 | { | |
3645 | const struct nft_rule *rule; | |
3646 | const struct nft_expr *expr, *last; | |
20a69341 PM |
3647 | const struct nft_set *set; |
3648 | struct nft_set_binding *binding; | |
3649 | struct nft_set_iter iter; | |
20a69341 PM |
3650 | |
3651 | if (ctx->chain == chain) | |
3652 | return -ELOOP; | |
3653 | ||
3654 | list_for_each_entry(rule, &chain->rules, list) { | |
3655 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
3656 | const struct nft_data *data = NULL; |
3657 | int err; | |
3658 | ||
3659 | if (!expr->ops->validate) | |
20a69341 PM |
3660 | continue; |
3661 | ||
0ca743a5 PNA |
3662 | err = expr->ops->validate(ctx, expr, &data); |
3663 | if (err < 0) | |
3664 | return err; | |
3665 | ||
20a69341 | 3666 | if (data == NULL) |
0ca743a5 | 3667 | continue; |
20a69341 PM |
3668 | |
3669 | switch (data->verdict) { | |
3670 | case NFT_JUMP: | |
3671 | case NFT_GOTO: | |
3672 | err = nf_tables_check_loops(ctx, data->chain); | |
3673 | if (err < 0) | |
3674 | return err; | |
3675 | default: | |
3676 | break; | |
3677 | } | |
3678 | } | |
3679 | } | |
3680 | ||
3681 | list_for_each_entry(set, &ctx->table->sets, list) { | |
3682 | if (!(set->flags & NFT_SET_MAP) || | |
3683 | set->dtype != NFT_DATA_VERDICT) | |
3684 | continue; | |
3685 | ||
3686 | list_for_each_entry(binding, &set->bindings, list) { | |
3687 | if (binding->chain != chain) | |
3688 | continue; | |
3689 | ||
3690 | iter.skip = 0; | |
3691 | iter.count = 0; | |
3692 | iter.err = 0; | |
3693 | iter.fn = nf_tables_loop_check_setelem; | |
3694 | ||
3695 | set->ops->walk(ctx, set, &iter); | |
3696 | if (iter.err < 0) | |
3697 | return iter.err; | |
3698 | } | |
3699 | } | |
3700 | ||
3701 | return 0; | |
3702 | } | |
3703 | ||
96518518 PM |
3704 | /** |
3705 | * nft_validate_input_register - validate an expressions' input register | |
3706 | * | |
3707 | * @reg: the register number | |
3708 | * | |
3709 | * Validate that the input register is one of the general purpose | |
3710 | * registers. | |
3711 | */ | |
3712 | int nft_validate_input_register(enum nft_registers reg) | |
3713 | { | |
3714 | if (reg <= NFT_REG_VERDICT) | |
3715 | return -EINVAL; | |
3716 | if (reg > NFT_REG_MAX) | |
3717 | return -ERANGE; | |
3718 | return 0; | |
3719 | } | |
3720 | EXPORT_SYMBOL_GPL(nft_validate_input_register); | |
3721 | ||
3722 | /** | |
3723 | * nft_validate_output_register - validate an expressions' output register | |
3724 | * | |
3725 | * @reg: the register number | |
3726 | * | |
3727 | * Validate that the output register is one of the general purpose | |
3728 | * registers or the verdict register. | |
3729 | */ | |
3730 | int nft_validate_output_register(enum nft_registers reg) | |
3731 | { | |
3732 | if (reg < NFT_REG_VERDICT) | |
3733 | return -EINVAL; | |
3734 | if (reg > NFT_REG_MAX) | |
3735 | return -ERANGE; | |
3736 | return 0; | |
3737 | } | |
3738 | EXPORT_SYMBOL_GPL(nft_validate_output_register); | |
3739 | ||
3740 | /** | |
3741 | * nft_validate_data_load - validate an expressions' data load | |
3742 | * | |
3743 | * @ctx: context of the expression performing the load | |
3744 | * @reg: the destination register number | |
3745 | * @data: the data to load | |
3746 | * @type: the data type | |
3747 | * | |
3748 | * Validate that a data load uses the appropriate data type for | |
3749 | * the destination register. A value of NULL for the data means | |
3750 | * that its runtime gathered data, which is always of type | |
3751 | * NFT_DATA_VALUE. | |
3752 | */ | |
3753 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, | |
3754 | const struct nft_data *data, | |
3755 | enum nft_data_types type) | |
3756 | { | |
20a69341 PM |
3757 | int err; |
3758 | ||
96518518 PM |
3759 | switch (reg) { |
3760 | case NFT_REG_VERDICT: | |
3761 | if (data == NULL || type != NFT_DATA_VERDICT) | |
3762 | return -EINVAL; | |
20a69341 PM |
3763 | |
3764 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { | |
3765 | err = nf_tables_check_loops(ctx, data->chain); | |
3766 | if (err < 0) | |
3767 | return err; | |
3768 | ||
3769 | if (ctx->chain->level + 1 > data->chain->level) { | |
3770 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) | |
3771 | return -EMLINK; | |
3772 | data->chain->level = ctx->chain->level + 1; | |
3773 | } | |
3774 | } | |
3775 | ||
96518518 PM |
3776 | return 0; |
3777 | default: | |
3778 | if (data != NULL && type != NFT_DATA_VALUE) | |
3779 | return -EINVAL; | |
3780 | return 0; | |
3781 | } | |
3782 | } | |
3783 | EXPORT_SYMBOL_GPL(nft_validate_data_load); | |
3784 | ||
3785 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
3786 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
3787 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
3788 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
3789 | }; | |
3790 | ||
3791 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3792 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3793 | { | |
3794 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
3795 | struct nft_chain *chain; | |
3796 | int err; | |
3797 | ||
3798 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
3799 | if (err < 0) | |
3800 | return err; | |
3801 | ||
3802 | if (!tb[NFTA_VERDICT_CODE]) | |
3803 | return -EINVAL; | |
3804 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); | |
3805 | ||
3806 | switch (data->verdict) { | |
e0abdadc PM |
3807 | default: |
3808 | switch (data->verdict & NF_VERDICT_MASK) { | |
3809 | case NF_ACCEPT: | |
3810 | case NF_DROP: | |
3811 | case NF_QUEUE: | |
3812 | break; | |
3813 | default: | |
3814 | return -EINVAL; | |
3815 | } | |
3816 | /* fall through */ | |
96518518 PM |
3817 | case NFT_CONTINUE: |
3818 | case NFT_BREAK: | |
3819 | case NFT_RETURN: | |
3820 | desc->len = sizeof(data->verdict); | |
3821 | break; | |
3822 | case NFT_JUMP: | |
3823 | case NFT_GOTO: | |
3824 | if (!tb[NFTA_VERDICT_CHAIN]) | |
3825 | return -EINVAL; | |
3826 | chain = nf_tables_chain_lookup(ctx->table, | |
3827 | tb[NFTA_VERDICT_CHAIN]); | |
3828 | if (IS_ERR(chain)) | |
3829 | return PTR_ERR(chain); | |
3830 | if (chain->flags & NFT_BASE_CHAIN) | |
3831 | return -EOPNOTSUPP; | |
3832 | ||
96518518 PM |
3833 | chain->use++; |
3834 | data->chain = chain; | |
3835 | desc->len = sizeof(data); | |
3836 | break; | |
96518518 PM |
3837 | } |
3838 | ||
3839 | desc->type = NFT_DATA_VERDICT; | |
3840 | return 0; | |
3841 | } | |
3842 | ||
3843 | static void nft_verdict_uninit(const struct nft_data *data) | |
3844 | { | |
3845 | switch (data->verdict) { | |
3846 | case NFT_JUMP: | |
3847 | case NFT_GOTO: | |
3848 | data->chain->use--; | |
3849 | break; | |
3850 | } | |
3851 | } | |
3852 | ||
3853 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
3854 | { | |
3855 | struct nlattr *nest; | |
3856 | ||
3857 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
3858 | if (!nest) | |
3859 | goto nla_put_failure; | |
3860 | ||
3861 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) | |
3862 | goto nla_put_failure; | |
3863 | ||
3864 | switch (data->verdict) { | |
3865 | case NFT_JUMP: | |
3866 | case NFT_GOTO: | |
3867 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) | |
3868 | goto nla_put_failure; | |
3869 | } | |
3870 | nla_nest_end(skb, nest); | |
3871 | return 0; | |
3872 | ||
3873 | nla_put_failure: | |
3874 | return -1; | |
3875 | } | |
3876 | ||
3877 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3878 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3879 | { | |
3880 | unsigned int len; | |
3881 | ||
3882 | len = nla_len(nla); | |
3883 | if (len == 0) | |
3884 | return -EINVAL; | |
3885 | if (len > sizeof(data->data)) | |
3886 | return -EOVERFLOW; | |
3887 | ||
3888 | nla_memcpy(data->data, nla, sizeof(data->data)); | |
3889 | desc->type = NFT_DATA_VALUE; | |
3890 | desc->len = len; | |
3891 | return 0; | |
3892 | } | |
3893 | ||
3894 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
3895 | unsigned int len) | |
3896 | { | |
3897 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
3898 | } | |
3899 | ||
3900 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
3901 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, | |
3902 | .len = FIELD_SIZEOF(struct nft_data, data) }, | |
3903 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, | |
3904 | }; | |
3905 | ||
3906 | /** | |
3907 | * nft_data_init - parse nf_tables data netlink attributes | |
3908 | * | |
3909 | * @ctx: context of the expression using the data | |
3910 | * @data: destination struct nft_data | |
3911 | * @desc: data description | |
3912 | * @nla: netlink attribute containing data | |
3913 | * | |
3914 | * Parse the netlink data attributes and initialize a struct nft_data. | |
3915 | * The type and length of data are returned in the data description. | |
3916 | * | |
3917 | * The caller can indicate that it only wants to accept data of type | |
3918 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
3919 | */ | |
3920 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3921 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3922 | { | |
3923 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
3924 | int err; | |
3925 | ||
3926 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
3927 | if (err < 0) | |
3928 | return err; | |
3929 | ||
3930 | if (tb[NFTA_DATA_VALUE]) | |
3931 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); | |
3932 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) | |
3933 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
3934 | return -EINVAL; | |
3935 | } | |
3936 | EXPORT_SYMBOL_GPL(nft_data_init); | |
3937 | ||
3938 | /** | |
3939 | * nft_data_uninit - release a nft_data item | |
3940 | * | |
3941 | * @data: struct nft_data to release | |
3942 | * @type: type of data | |
3943 | * | |
3944 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
3945 | * all others need to be released by calling this function. | |
3946 | */ | |
3947 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
3948 | { | |
3949 | switch (type) { | |
3950 | case NFT_DATA_VALUE: | |
3951 | return; | |
3952 | case NFT_DATA_VERDICT: | |
3953 | return nft_verdict_uninit(data); | |
3954 | default: | |
3955 | WARN_ON(1); | |
3956 | } | |
3957 | } | |
3958 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
3959 | ||
3960 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
3961 | enum nft_data_types type, unsigned int len) | |
3962 | { | |
3963 | struct nlattr *nest; | |
3964 | int err; | |
3965 | ||
3966 | nest = nla_nest_start(skb, attr); | |
3967 | if (nest == NULL) | |
3968 | return -1; | |
3969 | ||
3970 | switch (type) { | |
3971 | case NFT_DATA_VALUE: | |
3972 | err = nft_value_dump(skb, data, len); | |
3973 | break; | |
3974 | case NFT_DATA_VERDICT: | |
3975 | err = nft_verdict_dump(skb, data); | |
3976 | break; | |
3977 | default: | |
3978 | err = -EINVAL; | |
3979 | WARN_ON(1); | |
3980 | } | |
3981 | ||
3982 | nla_nest_end(skb, nest); | |
3983 | return err; | |
3984 | } | |
3985 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
3986 | ||
99633ab2 PNA |
3987 | static int nf_tables_init_net(struct net *net) |
3988 | { | |
3989 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 3990 | INIT_LIST_HEAD(&net->nft.commit_list); |
38e029f1 | 3991 | net->nft.base_seq = 1; |
99633ab2 PNA |
3992 | return 0; |
3993 | } | |
3994 | ||
3995 | static struct pernet_operations nf_tables_net_ops = { | |
3996 | .init = nf_tables_init_net, | |
3997 | }; | |
3998 | ||
96518518 PM |
3999 | static int __init nf_tables_module_init(void) |
4000 | { | |
4001 | int err; | |
4002 | ||
4003 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
4004 | GFP_KERNEL); | |
4005 | if (info == NULL) { | |
4006 | err = -ENOMEM; | |
4007 | goto err1; | |
4008 | } | |
4009 | ||
4010 | err = nf_tables_core_module_init(); | |
4011 | if (err < 0) | |
4012 | goto err2; | |
4013 | ||
4014 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
4015 | if (err < 0) | |
4016 | goto err3; | |
4017 | ||
4018 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 4019 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
4020 | err3: |
4021 | nf_tables_core_module_exit(); | |
4022 | err2: | |
4023 | kfree(info); | |
4024 | err1: | |
4025 | return err; | |
4026 | } | |
4027 | ||
4028 | static void __exit nf_tables_module_exit(void) | |
4029 | { | |
99633ab2 | 4030 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
4031 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
4032 | nf_tables_core_module_exit(); | |
4033 | kfree(info); | |
4034 | } | |
4035 | ||
4036 | module_init(nf_tables_module_init); | |
4037 | module_exit(nf_tables_module_exit); | |
4038 | ||
4039 | MODULE_LICENSE("GPL"); | |
4040 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
4041 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |