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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); | |
99633ab2 | 38 | list_add_tail(&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); | |
54 | list_del(&afi->list); | |
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 | ||
99633ab2 | 280 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
281 | if (family != NFPROTO_UNSPEC && family != afi->family) |
282 | continue; | |
283 | ||
284 | list_for_each_entry(table, &afi->tables, list) { | |
285 | if (idx < s_idx) | |
286 | goto cont; | |
287 | if (idx > s_idx) | |
288 | memset(&cb->args[1], 0, | |
289 | sizeof(cb->args) - sizeof(cb->args[0])); | |
290 | if (nf_tables_fill_table_info(skb, | |
291 | NETLINK_CB(cb->skb).portid, | |
292 | cb->nlh->nlmsg_seq, | |
293 | NFT_MSG_NEWTABLE, | |
294 | NLM_F_MULTI, | |
295 | afi->family, table) < 0) | |
296 | goto done; | |
297 | cont: | |
298 | idx++; | |
299 | } | |
300 | } | |
301 | done: | |
302 | cb->args[0] = idx; | |
303 | return skb->len; | |
304 | } | |
305 | ||
55dd6f93 PNA |
306 | /* Internal table flags */ |
307 | #define NFT_TABLE_INACTIVE (1 << 15) | |
308 | ||
96518518 PM |
309 | static int nf_tables_gettable(struct sock *nlsk, struct sk_buff *skb, |
310 | const struct nlmsghdr *nlh, | |
311 | const struct nlattr * const nla[]) | |
312 | { | |
313 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
314 | const struct nft_af_info *afi; | |
315 | const struct nft_table *table; | |
316 | struct sk_buff *skb2; | |
99633ab2 | 317 | struct net *net = sock_net(skb->sk); |
96518518 PM |
318 | int family = nfmsg->nfgen_family; |
319 | int err; | |
320 | ||
321 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
322 | struct netlink_dump_control c = { | |
323 | .dump = nf_tables_dump_tables, | |
324 | }; | |
325 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
326 | } | |
327 | ||
99633ab2 | 328 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
329 | if (IS_ERR(afi)) |
330 | return PTR_ERR(afi); | |
331 | ||
9370761c | 332 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
333 | if (IS_ERR(table)) |
334 | return PTR_ERR(table); | |
55dd6f93 PNA |
335 | if (table->flags & NFT_TABLE_INACTIVE) |
336 | return -ENOENT; | |
96518518 PM |
337 | |
338 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
339 | if (!skb2) | |
340 | return -ENOMEM; | |
341 | ||
342 | err = nf_tables_fill_table_info(skb2, NETLINK_CB(skb).portid, | |
343 | nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0, | |
344 | family, table); | |
345 | if (err < 0) | |
346 | goto err; | |
347 | ||
348 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
349 | ||
350 | err: | |
351 | kfree_skb(skb2); | |
352 | return err; | |
353 | } | |
354 | ||
115a60b1 PM |
355 | static int nf_tables_table_enable(const struct nft_af_info *afi, |
356 | struct nft_table *table) | |
9ddf6323 PNA |
357 | { |
358 | struct nft_chain *chain; | |
359 | int err, i = 0; | |
360 | ||
361 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
362 | if (!(chain->flags & NFT_BASE_CHAIN)) |
363 | continue; | |
364 | ||
115a60b1 | 365 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
366 | if (err < 0) |
367 | goto err; | |
368 | ||
369 | i++; | |
370 | } | |
371 | return 0; | |
372 | err: | |
373 | list_for_each_entry(chain, &table->chains, list) { | |
d2012975 PNA |
374 | if (!(chain->flags & NFT_BASE_CHAIN)) |
375 | continue; | |
376 | ||
9ddf6323 PNA |
377 | if (i-- <= 0) |
378 | break; | |
379 | ||
115a60b1 | 380 | nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops); |
9ddf6323 PNA |
381 | } |
382 | return err; | |
383 | } | |
384 | ||
f75edf5e | 385 | static void nf_tables_table_disable(const struct nft_af_info *afi, |
115a60b1 | 386 | struct nft_table *table) |
9ddf6323 PNA |
387 | { |
388 | struct nft_chain *chain; | |
389 | ||
d2012975 PNA |
390 | list_for_each_entry(chain, &table->chains, list) { |
391 | if (chain->flags & NFT_BASE_CHAIN) | |
115a60b1 PM |
392 | nf_unregister_hooks(nft_base_chain(chain)->ops, |
393 | afi->nops); | |
d2012975 | 394 | } |
9ddf6323 PNA |
395 | } |
396 | ||
e1aaca93 | 397 | static int nf_tables_updtable(struct nft_ctx *ctx) |
9ddf6323 | 398 | { |
55dd6f93 | 399 | struct nft_trans *trans; |
e1aaca93 | 400 | u32 flags; |
55dd6f93 | 401 | int ret = 0; |
9ddf6323 | 402 | |
e1aaca93 PNA |
403 | if (!ctx->nla[NFTA_TABLE_FLAGS]) |
404 | return 0; | |
9ddf6323 | 405 | |
e1aaca93 PNA |
406 | flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); |
407 | if (flags & ~NFT_TABLE_F_DORMANT) | |
408 | return -EINVAL; | |
409 | ||
55dd6f93 PNA |
410 | trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, |
411 | sizeof(struct nft_trans_table)); | |
412 | if (trans == NULL) | |
413 | return -ENOMEM; | |
9ddf6323 | 414 | |
e1aaca93 PNA |
415 | if ((flags & NFT_TABLE_F_DORMANT) && |
416 | !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { | |
55dd6f93 | 417 | nft_trans_table_enable(trans) = false; |
e1aaca93 PNA |
418 | } else if (!(flags & NFT_TABLE_F_DORMANT) && |
419 | ctx->table->flags & NFT_TABLE_F_DORMANT) { | |
420 | ret = nf_tables_table_enable(ctx->afi, ctx->table); | |
55dd6f93 | 421 | if (ret >= 0) { |
e1aaca93 | 422 | ctx->table->flags &= ~NFT_TABLE_F_DORMANT; |
55dd6f93 | 423 | nft_trans_table_enable(trans) = true; |
9ddf6323 | 424 | } |
9ddf6323 | 425 | } |
e1aaca93 PNA |
426 | if (ret < 0) |
427 | goto err; | |
9ddf6323 | 428 | |
55dd6f93 PNA |
429 | nft_trans_table_update(trans) = true; |
430 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
431 | return 0; | |
9ddf6323 | 432 | err: |
55dd6f93 | 433 | nft_trans_destroy(trans); |
9ddf6323 PNA |
434 | return ret; |
435 | } | |
436 | ||
55dd6f93 PNA |
437 | static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) |
438 | { | |
439 | struct nft_trans *trans; | |
440 | ||
441 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); | |
442 | if (trans == NULL) | |
443 | return -ENOMEM; | |
444 | ||
445 | if (msg_type == NFT_MSG_NEWTABLE) | |
446 | ctx->table->flags |= NFT_TABLE_INACTIVE; | |
447 | ||
448 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
449 | return 0; | |
450 | } | |
451 | ||
96518518 PM |
452 | static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb, |
453 | const struct nlmsghdr *nlh, | |
454 | const struct nlattr * const nla[]) | |
455 | { | |
456 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
457 | const struct nlattr *name; | |
458 | struct nft_af_info *afi; | |
459 | struct nft_table *table; | |
99633ab2 | 460 | struct net *net = sock_net(skb->sk); |
96518518 | 461 | int family = nfmsg->nfgen_family; |
c5c1f975 | 462 | u32 flags = 0; |
e1aaca93 | 463 | struct nft_ctx ctx; |
55dd6f93 | 464 | int err; |
96518518 | 465 | |
99633ab2 | 466 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
467 | if (IS_ERR(afi)) |
468 | return PTR_ERR(afi); | |
469 | ||
470 | name = nla[NFTA_TABLE_NAME]; | |
9370761c | 471 | table = nf_tables_table_lookup(afi, name); |
96518518 PM |
472 | if (IS_ERR(table)) { |
473 | if (PTR_ERR(table) != -ENOENT) | |
474 | return PTR_ERR(table); | |
475 | table = NULL; | |
476 | } | |
477 | ||
478 | if (table != NULL) { | |
55dd6f93 PNA |
479 | if (table->flags & NFT_TABLE_INACTIVE) |
480 | return -ENOENT; | |
96518518 PM |
481 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
482 | return -EEXIST; | |
483 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
484 | return -EOPNOTSUPP; | |
e1aaca93 PNA |
485 | |
486 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); | |
487 | return nf_tables_updtable(&ctx); | |
96518518 PM |
488 | } |
489 | ||
c5c1f975 PM |
490 | if (nla[NFTA_TABLE_FLAGS]) { |
491 | flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); | |
492 | if (flags & ~NFT_TABLE_F_DORMANT) | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
7047f9d0 PM |
496 | if (!try_module_get(afi->owner)) |
497 | return -EAFNOSUPPORT; | |
498 | ||
96518518 | 499 | table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL); |
7047f9d0 PM |
500 | if (table == NULL) { |
501 | module_put(afi->owner); | |
96518518 | 502 | return -ENOMEM; |
7047f9d0 | 503 | } |
96518518 PM |
504 | |
505 | nla_strlcpy(table->name, name, nla_len(name)); | |
506 | INIT_LIST_HEAD(&table->chains); | |
20a69341 | 507 | INIT_LIST_HEAD(&table->sets); |
c5c1f975 | 508 | table->flags = flags; |
9ddf6323 | 509 | |
55dd6f93 PNA |
510 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
511 | err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); | |
512 | if (err < 0) { | |
513 | kfree(table); | |
514 | module_put(afi->owner); | |
515 | return err; | |
516 | } | |
96518518 | 517 | list_add_tail(&table->list, &afi->tables); |
96518518 PM |
518 | return 0; |
519 | } | |
520 | ||
521 | static int nf_tables_deltable(struct sock *nlsk, struct sk_buff *skb, | |
522 | const struct nlmsghdr *nlh, | |
523 | const struct nlattr * const nla[]) | |
524 | { | |
525 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
526 | struct nft_af_info *afi; | |
527 | struct nft_table *table; | |
99633ab2 | 528 | struct net *net = sock_net(skb->sk); |
55dd6f93 PNA |
529 | int family = nfmsg->nfgen_family, err; |
530 | struct nft_ctx ctx; | |
96518518 | 531 | |
99633ab2 | 532 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
533 | if (IS_ERR(afi)) |
534 | return PTR_ERR(afi); | |
535 | ||
9370761c | 536 | table = nf_tables_table_lookup(afi, nla[NFTA_TABLE_NAME]); |
96518518 PM |
537 | if (IS_ERR(table)) |
538 | return PTR_ERR(table); | |
55dd6f93 PNA |
539 | if (table->flags & NFT_TABLE_INACTIVE) |
540 | return -ENOENT; | |
96518518 | 541 | |
44a6f0df | 542 | if (!list_empty(&table->chains) || !list_empty(&table->sets)) |
96518518 PM |
543 | return -EBUSY; |
544 | ||
55dd6f93 PNA |
545 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
546 | err = nft_trans_table_add(&ctx, NFT_MSG_DELTABLE); | |
547 | if (err < 0) | |
548 | return err; | |
549 | ||
96518518 | 550 | list_del(&table->list); |
96518518 PM |
551 | return 0; |
552 | } | |
553 | ||
55dd6f93 PNA |
554 | static void nf_tables_table_destroy(struct nft_ctx *ctx) |
555 | { | |
556 | kfree(ctx->table); | |
557 | module_put(ctx->afi->owner); | |
558 | } | |
559 | ||
2a37d755 | 560 | int nft_register_chain_type(const struct nf_chain_type *ctype) |
96518518 | 561 | { |
9370761c | 562 | int err = 0; |
96518518 PM |
563 | |
564 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
9370761c PNA |
565 | if (chain_type[ctype->family][ctype->type] != NULL) { |
566 | err = -EBUSY; | |
567 | goto out; | |
96518518 | 568 | } |
9370761c PNA |
569 | chain_type[ctype->family][ctype->type] = ctype; |
570 | out: | |
96518518 PM |
571 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
572 | return err; | |
573 | } | |
9370761c | 574 | EXPORT_SYMBOL_GPL(nft_register_chain_type); |
96518518 | 575 | |
2a37d755 | 576 | void nft_unregister_chain_type(const struct nf_chain_type *ctype) |
96518518 | 577 | { |
96518518 | 578 | nfnl_lock(NFNL_SUBSYS_NFTABLES); |
9370761c | 579 | chain_type[ctype->family][ctype->type] = NULL; |
96518518 PM |
580 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
581 | } | |
9370761c | 582 | EXPORT_SYMBOL_GPL(nft_unregister_chain_type); |
96518518 PM |
583 | |
584 | /* | |
585 | * Chains | |
586 | */ | |
587 | ||
588 | static struct nft_chain * | |
589 | nf_tables_chain_lookup_byhandle(const struct nft_table *table, u64 handle) | |
590 | { | |
591 | struct nft_chain *chain; | |
592 | ||
593 | list_for_each_entry(chain, &table->chains, list) { | |
594 | if (chain->handle == handle) | |
595 | return chain; | |
596 | } | |
597 | ||
598 | return ERR_PTR(-ENOENT); | |
599 | } | |
600 | ||
601 | static struct nft_chain *nf_tables_chain_lookup(const struct nft_table *table, | |
602 | const struct nlattr *nla) | |
603 | { | |
604 | struct nft_chain *chain; | |
605 | ||
606 | if (nla == NULL) | |
607 | return ERR_PTR(-EINVAL); | |
608 | ||
609 | list_for_each_entry(chain, &table->chains, list) { | |
610 | if (!nla_strcmp(nla, chain->name)) | |
611 | return chain; | |
612 | } | |
613 | ||
614 | return ERR_PTR(-ENOENT); | |
615 | } | |
616 | ||
617 | static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { | |
618 | [NFTA_CHAIN_TABLE] = { .type = NLA_STRING }, | |
619 | [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, | |
620 | [NFTA_CHAIN_NAME] = { .type = NLA_STRING, | |
621 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
622 | [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, | |
0ca743a5 | 623 | [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, |
4c1f7818 | 624 | [NFTA_CHAIN_TYPE] = { .type = NLA_STRING }, |
0ca743a5 | 625 | [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, |
96518518 PM |
626 | }; |
627 | ||
628 | static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { | |
629 | [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, | |
630 | [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, | |
631 | }; | |
632 | ||
0ca743a5 PNA |
633 | static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) |
634 | { | |
635 | struct nft_stats *cpu_stats, total; | |
636 | struct nlattr *nest; | |
637 | int cpu; | |
638 | ||
639 | memset(&total, 0, sizeof(total)); | |
640 | for_each_possible_cpu(cpu) { | |
641 | cpu_stats = per_cpu_ptr(stats, cpu); | |
642 | total.pkts += cpu_stats->pkts; | |
643 | total.bytes += cpu_stats->bytes; | |
644 | } | |
645 | nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS); | |
646 | if (nest == NULL) | |
647 | goto nla_put_failure; | |
648 | ||
649 | if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) || | |
650 | nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes))) | |
651 | goto nla_put_failure; | |
652 | ||
653 | nla_nest_end(skb, nest); | |
654 | return 0; | |
655 | ||
656 | nla_put_failure: | |
657 | return -ENOSPC; | |
658 | } | |
659 | ||
96518518 PM |
660 | static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq, |
661 | int event, u32 flags, int family, | |
662 | const struct nft_table *table, | |
663 | const struct nft_chain *chain) | |
664 | { | |
665 | struct nlmsghdr *nlh; | |
666 | struct nfgenmsg *nfmsg; | |
667 | ||
668 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
669 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags); | |
670 | if (nlh == NULL) | |
671 | goto nla_put_failure; | |
672 | ||
673 | nfmsg = nlmsg_data(nlh); | |
674 | nfmsg->nfgen_family = family; | |
675 | nfmsg->version = NFNETLINK_V0; | |
676 | nfmsg->res_id = 0; | |
677 | ||
678 | if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) | |
679 | goto nla_put_failure; | |
680 | if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle))) | |
681 | goto nla_put_failure; | |
682 | if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) | |
683 | goto nla_put_failure; | |
684 | ||
685 | if (chain->flags & NFT_BASE_CHAIN) { | |
0ca743a5 | 686 | const struct nft_base_chain *basechain = nft_base_chain(chain); |
115a60b1 | 687 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
688 | struct nlattr *nest; |
689 | ||
690 | nest = nla_nest_start(skb, NFTA_CHAIN_HOOK); | |
96518518 PM |
691 | if (nest == NULL) |
692 | goto nla_put_failure; | |
693 | if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) | |
694 | goto nla_put_failure; | |
695 | if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) | |
696 | goto nla_put_failure; | |
697 | nla_nest_end(skb, nest); | |
9370761c | 698 | |
0ca743a5 PNA |
699 | if (nla_put_be32(skb, NFTA_CHAIN_POLICY, |
700 | htonl(basechain->policy))) | |
701 | goto nla_put_failure; | |
702 | ||
baae3e62 PM |
703 | if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) |
704 | goto nla_put_failure; | |
0ca743a5 PNA |
705 | |
706 | if (nft_dump_stats(skb, nft_base_chain(chain)->stats)) | |
707 | goto nla_put_failure; | |
96518518 PM |
708 | } |
709 | ||
0ca743a5 PNA |
710 | if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) |
711 | goto nla_put_failure; | |
712 | ||
96518518 PM |
713 | return nlmsg_end(skb, nlh); |
714 | ||
715 | nla_put_failure: | |
716 | nlmsg_trim(skb, nlh); | |
717 | return -1; | |
718 | } | |
719 | ||
35151d84 | 720 | static int nf_tables_chain_notify(const struct nft_ctx *ctx, int event) |
96518518 PM |
721 | { |
722 | struct sk_buff *skb; | |
96518518 PM |
723 | int err; |
724 | ||
128ad332 PNA |
725 | if (!ctx->report && |
726 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
727 | return 0; |
728 | ||
729 | err = -ENOBUFS; | |
730 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
731 | if (skb == NULL) | |
732 | goto err; | |
733 | ||
128ad332 | 734 | err = nf_tables_fill_chain_info(skb, ctx->portid, ctx->seq, event, 0, |
35151d84 PNA |
735 | ctx->afi->family, ctx->table, |
736 | ctx->chain); | |
96518518 PM |
737 | if (err < 0) { |
738 | kfree_skb(skb); | |
739 | goto err; | |
740 | } | |
741 | ||
128ad332 PNA |
742 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
743 | ctx->report, GFP_KERNEL); | |
96518518 | 744 | err: |
128ad332 PNA |
745 | if (err < 0) { |
746 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
747 | err); | |
748 | } | |
96518518 PM |
749 | return err; |
750 | } | |
751 | ||
752 | static int nf_tables_dump_chains(struct sk_buff *skb, | |
753 | struct netlink_callback *cb) | |
754 | { | |
755 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
756 | const struct nft_af_info *afi; | |
757 | const struct nft_table *table; | |
758 | const struct nft_chain *chain; | |
759 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 760 | struct net *net = sock_net(skb->sk); |
96518518 PM |
761 | int family = nfmsg->nfgen_family; |
762 | ||
99633ab2 | 763 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
764 | if (family != NFPROTO_UNSPEC && family != afi->family) |
765 | continue; | |
766 | ||
767 | list_for_each_entry(table, &afi->tables, list) { | |
768 | list_for_each_entry(chain, &table->chains, list) { | |
769 | if (idx < s_idx) | |
770 | goto cont; | |
771 | if (idx > s_idx) | |
772 | memset(&cb->args[1], 0, | |
773 | sizeof(cb->args) - sizeof(cb->args[0])); | |
774 | if (nf_tables_fill_chain_info(skb, NETLINK_CB(cb->skb).portid, | |
775 | cb->nlh->nlmsg_seq, | |
776 | NFT_MSG_NEWCHAIN, | |
777 | NLM_F_MULTI, | |
778 | afi->family, table, chain) < 0) | |
779 | goto done; | |
780 | cont: | |
781 | idx++; | |
782 | } | |
783 | } | |
784 | } | |
785 | done: | |
786 | cb->args[0] = idx; | |
787 | return skb->len; | |
788 | } | |
789 | ||
790 | ||
791 | static int nf_tables_getchain(struct sock *nlsk, struct sk_buff *skb, | |
792 | const struct nlmsghdr *nlh, | |
793 | const struct nlattr * const nla[]) | |
794 | { | |
795 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
796 | const struct nft_af_info *afi; | |
797 | const struct nft_table *table; | |
798 | const struct nft_chain *chain; | |
799 | struct sk_buff *skb2; | |
99633ab2 | 800 | struct net *net = sock_net(skb->sk); |
96518518 PM |
801 | int family = nfmsg->nfgen_family; |
802 | int err; | |
803 | ||
804 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
805 | struct netlink_dump_control c = { | |
806 | .dump = nf_tables_dump_chains, | |
807 | }; | |
808 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
809 | } | |
810 | ||
99633ab2 | 811 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
812 | if (IS_ERR(afi)) |
813 | return PTR_ERR(afi); | |
814 | ||
9370761c | 815 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
816 | if (IS_ERR(table)) |
817 | return PTR_ERR(table); | |
55dd6f93 PNA |
818 | if (table->flags & NFT_TABLE_INACTIVE) |
819 | return -ENOENT; | |
96518518 PM |
820 | |
821 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
822 | if (IS_ERR(chain)) | |
823 | return PTR_ERR(chain); | |
91c7b38d PNA |
824 | if (chain->flags & NFT_CHAIN_INACTIVE) |
825 | return -ENOENT; | |
96518518 PM |
826 | |
827 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
828 | if (!skb2) | |
829 | return -ENOMEM; | |
830 | ||
831 | err = nf_tables_fill_chain_info(skb2, NETLINK_CB(skb).portid, | |
832 | nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0, | |
833 | family, table, chain); | |
834 | if (err < 0) | |
835 | goto err; | |
836 | ||
837 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
838 | ||
839 | err: | |
840 | kfree_skb(skb2); | |
841 | return err; | |
842 | } | |
843 | ||
0ca743a5 PNA |
844 | static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { |
845 | [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, | |
846 | [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, | |
847 | }; | |
848 | ||
ff3cd7b3 | 849 | static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) |
0ca743a5 PNA |
850 | { |
851 | struct nlattr *tb[NFTA_COUNTER_MAX+1]; | |
852 | struct nft_stats __percpu *newstats; | |
853 | struct nft_stats *stats; | |
854 | int err; | |
855 | ||
856 | err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy); | |
857 | if (err < 0) | |
ff3cd7b3 | 858 | return ERR_PTR(err); |
0ca743a5 PNA |
859 | |
860 | if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) | |
ff3cd7b3 | 861 | return ERR_PTR(-EINVAL); |
0ca743a5 PNA |
862 | |
863 | newstats = alloc_percpu(struct nft_stats); | |
864 | if (newstats == NULL) | |
ff3cd7b3 | 865 | return ERR_PTR(-ENOMEM); |
0ca743a5 PNA |
866 | |
867 | /* Restore old counters on this cpu, no problem. Per-cpu statistics | |
868 | * are not exposed to userspace. | |
869 | */ | |
870 | stats = this_cpu_ptr(newstats); | |
871 | stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); | |
872 | stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); | |
873 | ||
ff3cd7b3 PNA |
874 | return newstats; |
875 | } | |
876 | ||
877 | static void nft_chain_stats_replace(struct nft_base_chain *chain, | |
878 | struct nft_stats __percpu *newstats) | |
879 | { | |
0ca743a5 | 880 | if (chain->stats) { |
0ca743a5 | 881 | struct nft_stats __percpu *oldstats = |
67a8fc27 | 882 | nft_dereference(chain->stats); |
0ca743a5 PNA |
883 | |
884 | rcu_assign_pointer(chain->stats, newstats); | |
885 | synchronize_rcu(); | |
886 | free_percpu(oldstats); | |
887 | } else | |
888 | rcu_assign_pointer(chain->stats, newstats); | |
0ca743a5 PNA |
889 | } |
890 | ||
91c7b38d PNA |
891 | static int nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) |
892 | { | |
893 | struct nft_trans *trans; | |
894 | ||
895 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); | |
896 | if (trans == NULL) | |
897 | return -ENOMEM; | |
898 | ||
899 | if (msg_type == NFT_MSG_NEWCHAIN) | |
900 | ctx->chain->flags |= NFT_CHAIN_INACTIVE; | |
0ca743a5 | 901 | |
91c7b38d | 902 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
0ca743a5 PNA |
903 | return 0; |
904 | } | |
905 | ||
91c7b38d PNA |
906 | static void nf_tables_chain_destroy(struct nft_chain *chain) |
907 | { | |
908 | BUG_ON(chain->use > 0); | |
909 | ||
910 | if (chain->flags & NFT_BASE_CHAIN) { | |
911 | module_put(nft_base_chain(chain)->type->owner); | |
912 | free_percpu(nft_base_chain(chain)->stats); | |
913 | kfree(nft_base_chain(chain)); | |
914 | } else { | |
915 | kfree(chain); | |
916 | } | |
917 | } | |
918 | ||
96518518 PM |
919 | static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb, |
920 | const struct nlmsghdr *nlh, | |
921 | const struct nlattr * const nla[]) | |
922 | { | |
923 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
924 | const struct nlattr * uninitialized_var(name); | |
7c95f6d8 | 925 | struct nft_af_info *afi; |
96518518 PM |
926 | struct nft_table *table; |
927 | struct nft_chain *chain; | |
0ca743a5 | 928 | struct nft_base_chain *basechain = NULL; |
96518518 | 929 | struct nlattr *ha[NFTA_HOOK_MAX + 1]; |
99633ab2 | 930 | struct net *net = sock_net(skb->sk); |
96518518 | 931 | int family = nfmsg->nfgen_family; |
57de2a0c | 932 | u8 policy = NF_ACCEPT; |
96518518 | 933 | u64 handle = 0; |
115a60b1 | 934 | unsigned int i; |
ff3cd7b3 | 935 | struct nft_stats __percpu *stats; |
96518518 PM |
936 | int err; |
937 | bool create; | |
91c7b38d | 938 | struct nft_ctx ctx; |
96518518 PM |
939 | |
940 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
941 | ||
99633ab2 | 942 | afi = nf_tables_afinfo_lookup(net, family, true); |
96518518 PM |
943 | if (IS_ERR(afi)) |
944 | return PTR_ERR(afi); | |
945 | ||
9370761c | 946 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
947 | if (IS_ERR(table)) |
948 | return PTR_ERR(table); | |
949 | ||
96518518 PM |
950 | chain = NULL; |
951 | name = nla[NFTA_CHAIN_NAME]; | |
952 | ||
953 | if (nla[NFTA_CHAIN_HANDLE]) { | |
954 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); | |
955 | chain = nf_tables_chain_lookup_byhandle(table, handle); | |
956 | if (IS_ERR(chain)) | |
957 | return PTR_ERR(chain); | |
958 | } else { | |
959 | chain = nf_tables_chain_lookup(table, name); | |
960 | if (IS_ERR(chain)) { | |
961 | if (PTR_ERR(chain) != -ENOENT) | |
962 | return PTR_ERR(chain); | |
963 | chain = NULL; | |
964 | } | |
965 | } | |
966 | ||
57de2a0c PM |
967 | if (nla[NFTA_CHAIN_POLICY]) { |
968 | if ((chain != NULL && | |
969 | !(chain->flags & NFT_BASE_CHAIN)) || | |
970 | nla[NFTA_CHAIN_HOOK] == NULL) | |
971 | return -EOPNOTSUPP; | |
972 | ||
8f46df18 | 973 | policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); |
57de2a0c PM |
974 | switch (policy) { |
975 | case NF_DROP: | |
976 | case NF_ACCEPT: | |
977 | break; | |
978 | default: | |
979 | return -EINVAL; | |
980 | } | |
981 | } | |
982 | ||
96518518 | 983 | if (chain != NULL) { |
91c7b38d PNA |
984 | struct nft_stats *stats = NULL; |
985 | struct nft_trans *trans; | |
986 | ||
987 | if (chain->flags & NFT_CHAIN_INACTIVE) | |
988 | return -ENOENT; | |
96518518 PM |
989 | if (nlh->nlmsg_flags & NLM_F_EXCL) |
990 | return -EEXIST; | |
991 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
992 | return -EOPNOTSUPP; | |
993 | ||
994 | if (nla[NFTA_CHAIN_HANDLE] && name && | |
995 | !IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]))) | |
996 | return -EEXIST; | |
997 | ||
0ca743a5 PNA |
998 | if (nla[NFTA_CHAIN_COUNTERS]) { |
999 | if (!(chain->flags & NFT_BASE_CHAIN)) | |
1000 | return -EOPNOTSUPP; | |
1001 | ||
ff3cd7b3 PNA |
1002 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1003 | if (IS_ERR(stats)) | |
1004 | return PTR_ERR(stats); | |
0ca743a5 PNA |
1005 | } |
1006 | ||
91c7b38d PNA |
1007 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1008 | trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN, | |
1009 | sizeof(struct nft_trans_chain)); | |
1010 | if (trans == NULL) | |
1011 | return -ENOMEM; | |
4401a862 | 1012 | |
91c7b38d PNA |
1013 | nft_trans_chain_stats(trans) = stats; |
1014 | nft_trans_chain_update(trans) = true; | |
4401a862 | 1015 | |
91c7b38d PNA |
1016 | if (nla[NFTA_CHAIN_POLICY]) |
1017 | nft_trans_chain_policy(trans) = policy; | |
1018 | else | |
1019 | nft_trans_chain_policy(trans) = -1; | |
96518518 | 1020 | |
91c7b38d PNA |
1021 | if (nla[NFTA_CHAIN_HANDLE] && name) { |
1022 | nla_strlcpy(nft_trans_chain_name(trans), name, | |
1023 | NFT_CHAIN_MAXNAMELEN); | |
1024 | } | |
1025 | list_add_tail(&trans->list, &net->nft.commit_list); | |
1026 | return 0; | |
96518518 PM |
1027 | } |
1028 | ||
75820676 PM |
1029 | if (table->use == UINT_MAX) |
1030 | return -EOVERFLOW; | |
1031 | ||
96518518 | 1032 | if (nla[NFTA_CHAIN_HOOK]) { |
2a37d755 | 1033 | const struct nf_chain_type *type; |
96518518 | 1034 | struct nf_hook_ops *ops; |
9370761c | 1035 | nf_hookfn *hookfn; |
115a60b1 | 1036 | u32 hooknum, priority; |
9370761c | 1037 | |
baae3e62 | 1038 | type = chain_type[family][NFT_CHAIN_T_DEFAULT]; |
9370761c PNA |
1039 | if (nla[NFTA_CHAIN_TYPE]) { |
1040 | type = nf_tables_chain_type_lookup(afi, | |
1041 | nla[NFTA_CHAIN_TYPE], | |
1042 | create); | |
93b0806f PM |
1043 | if (IS_ERR(type)) |
1044 | return PTR_ERR(type); | |
9370761c | 1045 | } |
96518518 PM |
1046 | |
1047 | err = nla_parse_nested(ha, NFTA_HOOK_MAX, nla[NFTA_CHAIN_HOOK], | |
1048 | nft_hook_policy); | |
1049 | if (err < 0) | |
1050 | return err; | |
1051 | if (ha[NFTA_HOOK_HOOKNUM] == NULL || | |
1052 | ha[NFTA_HOOK_PRIORITY] == NULL) | |
1053 | return -EINVAL; | |
9370761c PNA |
1054 | |
1055 | hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); | |
1056 | if (hooknum >= afi->nhooks) | |
96518518 | 1057 | return -EINVAL; |
115a60b1 | 1058 | priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); |
96518518 | 1059 | |
baae3e62 | 1060 | if (!(type->hook_mask & (1 << hooknum))) |
9370761c | 1061 | return -EOPNOTSUPP; |
fa2c1de0 | 1062 | if (!try_module_get(type->owner)) |
baae3e62 | 1063 | return -ENOENT; |
fa2c1de0 | 1064 | hookfn = type->hooks[hooknum]; |
9370761c | 1065 | |
96518518 PM |
1066 | basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); |
1067 | if (basechain == NULL) | |
1068 | return -ENOMEM; | |
9370761c | 1069 | |
4401a862 | 1070 | if (nla[NFTA_CHAIN_COUNTERS]) { |
ff3cd7b3 PNA |
1071 | stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); |
1072 | if (IS_ERR(stats)) { | |
fa2c1de0 | 1073 | module_put(type->owner); |
4401a862 | 1074 | kfree(basechain); |
ff3cd7b3 | 1075 | return PTR_ERR(stats); |
4401a862 | 1076 | } |
ff3cd7b3 | 1077 | basechain->stats = stats; |
4401a862 | 1078 | } else { |
ff3cd7b3 PNA |
1079 | stats = alloc_percpu(struct nft_stats); |
1080 | if (IS_ERR(stats)) { | |
fa2c1de0 | 1081 | module_put(type->owner); |
4401a862 | 1082 | kfree(basechain); |
ff3cd7b3 | 1083 | return PTR_ERR(stats); |
4401a862 | 1084 | } |
ff3cd7b3 | 1085 | rcu_assign_pointer(basechain->stats, stats); |
4401a862 PM |
1086 | } |
1087 | ||
9370761c | 1088 | basechain->type = type; |
96518518 PM |
1089 | chain = &basechain->chain; |
1090 | ||
115a60b1 PM |
1091 | for (i = 0; i < afi->nops; i++) { |
1092 | ops = &basechain->ops[i]; | |
1093 | ops->pf = family; | |
1094 | ops->owner = afi->owner; | |
1095 | ops->hooknum = hooknum; | |
1096 | ops->priority = priority; | |
1097 | ops->priv = chain; | |
1098 | ops->hook = afi->hooks[ops->hooknum]; | |
1099 | if (hookfn) | |
1100 | ops->hook = hookfn; | |
1101 | if (afi->hook_ops_init) | |
1102 | afi->hook_ops_init(ops, i); | |
1103 | } | |
96518518 PM |
1104 | |
1105 | chain->flags |= NFT_BASE_CHAIN; | |
57de2a0c | 1106 | basechain->policy = policy; |
96518518 PM |
1107 | } else { |
1108 | chain = kzalloc(sizeof(*chain), GFP_KERNEL); | |
1109 | if (chain == NULL) | |
1110 | return -ENOMEM; | |
1111 | } | |
1112 | ||
1113 | INIT_LIST_HEAD(&chain->rules); | |
1114 | chain->handle = nf_tables_alloc_handle(table); | |
0628b123 | 1115 | chain->net = net; |
b5bc89bf | 1116 | chain->table = table; |
96518518 PM |
1117 | nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN); |
1118 | ||
9ddf6323 PNA |
1119 | if (!(table->flags & NFT_TABLE_F_DORMANT) && |
1120 | chain->flags & NFT_BASE_CHAIN) { | |
115a60b1 | 1121 | err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops); |
91c7b38d PNA |
1122 | if (err < 0) |
1123 | goto err1; | |
0ca743a5 | 1124 | } |
96518518 | 1125 | |
91c7b38d PNA |
1126 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1127 | err = nft_trans_chain_add(&ctx, NFT_MSG_NEWCHAIN); | |
1128 | if (err < 0) | |
1129 | goto err2; | |
96518518 | 1130 | |
91c7b38d PNA |
1131 | list_add_tail(&chain->list, &table->chains); |
1132 | return 0; | |
1133 | err2: | |
1134 | if (!(table->flags & NFT_TABLE_F_DORMANT) && | |
1135 | chain->flags & NFT_BASE_CHAIN) { | |
1136 | nf_unregister_hooks(nft_base_chain(chain)->ops, | |
1137 | afi->nops); | |
1138 | } | |
1139 | err1: | |
1140 | nf_tables_chain_destroy(chain); | |
1141 | return err; | |
96518518 PM |
1142 | } |
1143 | ||
1144 | static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb, | |
1145 | const struct nlmsghdr *nlh, | |
1146 | const struct nlattr * const nla[]) | |
1147 | { | |
1148 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1149 | struct nft_af_info *afi; |
96518518 PM |
1150 | struct nft_table *table; |
1151 | struct nft_chain *chain; | |
99633ab2 | 1152 | struct net *net = sock_net(skb->sk); |
96518518 | 1153 | int family = nfmsg->nfgen_family; |
91c7b38d PNA |
1154 | struct nft_ctx ctx; |
1155 | int err; | |
96518518 | 1156 | |
99633ab2 | 1157 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1158 | if (IS_ERR(afi)) |
1159 | return PTR_ERR(afi); | |
1160 | ||
9370761c | 1161 | table = nf_tables_table_lookup(afi, nla[NFTA_CHAIN_TABLE]); |
96518518 PM |
1162 | if (IS_ERR(table)) |
1163 | return PTR_ERR(table); | |
55dd6f93 PNA |
1164 | if (table->flags & NFT_TABLE_INACTIVE) |
1165 | return -ENOENT; | |
96518518 PM |
1166 | |
1167 | chain = nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME]); | |
1168 | if (IS_ERR(chain)) | |
1169 | return PTR_ERR(chain); | |
91c7b38d PNA |
1170 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1171 | return -ENOENT; | |
3dd7279f | 1172 | if (!list_empty(&chain->rules) || chain->use > 0) |
96518518 PM |
1173 | return -EBUSY; |
1174 | ||
91c7b38d PNA |
1175 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1176 | err = nft_trans_chain_add(&ctx, NFT_MSG_DELCHAIN); | |
1177 | if (err < 0) | |
1178 | return err; | |
0165d932 | 1179 | |
91c7b38d | 1180 | list_del(&chain->list); |
96518518 PM |
1181 | return 0; |
1182 | } | |
1183 | ||
96518518 PM |
1184 | /* |
1185 | * Expressions | |
1186 | */ | |
1187 | ||
1188 | /** | |
ef1f7df9 PM |
1189 | * nft_register_expr - register nf_tables expr type |
1190 | * @ops: expr type | |
96518518 | 1191 | * |
ef1f7df9 | 1192 | * Registers the expr type for use with nf_tables. Returns zero on |
96518518 PM |
1193 | * success or a negative errno code otherwise. |
1194 | */ | |
ef1f7df9 | 1195 | int nft_register_expr(struct nft_expr_type *type) |
96518518 PM |
1196 | { |
1197 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
758dbcec TB |
1198 | if (type->family == NFPROTO_UNSPEC) |
1199 | list_add_tail(&type->list, &nf_tables_expressions); | |
1200 | else | |
1201 | list_add(&type->list, &nf_tables_expressions); | |
96518518 PM |
1202 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1203 | return 0; | |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(nft_register_expr); | |
1206 | ||
1207 | /** | |
ef1f7df9 PM |
1208 | * nft_unregister_expr - unregister nf_tables expr type |
1209 | * @ops: expr type | |
96518518 | 1210 | * |
ef1f7df9 | 1211 | * Unregisters the expr typefor use with nf_tables. |
96518518 | 1212 | */ |
ef1f7df9 | 1213 | void nft_unregister_expr(struct nft_expr_type *type) |
96518518 PM |
1214 | { |
1215 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
ef1f7df9 | 1216 | list_del(&type->list); |
96518518 PM |
1217 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1218 | } | |
1219 | EXPORT_SYMBOL_GPL(nft_unregister_expr); | |
1220 | ||
64d46806 PM |
1221 | static const struct nft_expr_type *__nft_expr_type_get(u8 family, |
1222 | struct nlattr *nla) | |
96518518 | 1223 | { |
ef1f7df9 | 1224 | const struct nft_expr_type *type; |
96518518 | 1225 | |
ef1f7df9 | 1226 | list_for_each_entry(type, &nf_tables_expressions, list) { |
64d46806 PM |
1227 | if (!nla_strcmp(nla, type->name) && |
1228 | (!type->family || type->family == family)) | |
ef1f7df9 | 1229 | return type; |
96518518 PM |
1230 | } |
1231 | return NULL; | |
1232 | } | |
1233 | ||
64d46806 PM |
1234 | static const struct nft_expr_type *nft_expr_type_get(u8 family, |
1235 | struct nlattr *nla) | |
96518518 | 1236 | { |
ef1f7df9 | 1237 | const struct nft_expr_type *type; |
96518518 PM |
1238 | |
1239 | if (nla == NULL) | |
1240 | return ERR_PTR(-EINVAL); | |
1241 | ||
64d46806 | 1242 | type = __nft_expr_type_get(family, nla); |
ef1f7df9 PM |
1243 | if (type != NULL && try_module_get(type->owner)) |
1244 | return type; | |
96518518 PM |
1245 | |
1246 | #ifdef CONFIG_MODULES | |
ef1f7df9 | 1247 | if (type == NULL) { |
64d46806 PM |
1248 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1249 | request_module("nft-expr-%u-%.*s", family, | |
1250 | nla_len(nla), (char *)nla_data(nla)); | |
1251 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1252 | if (__nft_expr_type_get(family, nla)) | |
1253 | return ERR_PTR(-EAGAIN); | |
1254 | ||
96518518 PM |
1255 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); |
1256 | request_module("nft-expr-%.*s", | |
1257 | nla_len(nla), (char *)nla_data(nla)); | |
1258 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
64d46806 | 1259 | if (__nft_expr_type_get(family, nla)) |
96518518 PM |
1260 | return ERR_PTR(-EAGAIN); |
1261 | } | |
1262 | #endif | |
1263 | return ERR_PTR(-ENOENT); | |
1264 | } | |
1265 | ||
1266 | static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { | |
1267 | [NFTA_EXPR_NAME] = { .type = NLA_STRING }, | |
1268 | [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, | |
1269 | }; | |
1270 | ||
1271 | static int nf_tables_fill_expr_info(struct sk_buff *skb, | |
1272 | const struct nft_expr *expr) | |
1273 | { | |
ef1f7df9 | 1274 | if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) |
96518518 PM |
1275 | goto nla_put_failure; |
1276 | ||
1277 | if (expr->ops->dump) { | |
1278 | struct nlattr *data = nla_nest_start(skb, NFTA_EXPR_DATA); | |
1279 | if (data == NULL) | |
1280 | goto nla_put_failure; | |
1281 | if (expr->ops->dump(skb, expr) < 0) | |
1282 | goto nla_put_failure; | |
1283 | nla_nest_end(skb, data); | |
1284 | } | |
1285 | ||
1286 | return skb->len; | |
1287 | ||
1288 | nla_put_failure: | |
1289 | return -1; | |
1290 | }; | |
1291 | ||
1292 | struct nft_expr_info { | |
1293 | const struct nft_expr_ops *ops; | |
ef1f7df9 | 1294 | struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; |
96518518 PM |
1295 | }; |
1296 | ||
0ca743a5 PNA |
1297 | static int nf_tables_expr_parse(const struct nft_ctx *ctx, |
1298 | const struct nlattr *nla, | |
96518518 PM |
1299 | struct nft_expr_info *info) |
1300 | { | |
ef1f7df9 | 1301 | const struct nft_expr_type *type; |
96518518 | 1302 | const struct nft_expr_ops *ops; |
ef1f7df9 | 1303 | struct nlattr *tb[NFTA_EXPR_MAX + 1]; |
96518518 PM |
1304 | int err; |
1305 | ||
ef1f7df9 | 1306 | err = nla_parse_nested(tb, NFTA_EXPR_MAX, nla, nft_expr_policy); |
96518518 PM |
1307 | if (err < 0) |
1308 | return err; | |
1309 | ||
64d46806 | 1310 | type = nft_expr_type_get(ctx->afi->family, tb[NFTA_EXPR_NAME]); |
ef1f7df9 PM |
1311 | if (IS_ERR(type)) |
1312 | return PTR_ERR(type); | |
1313 | ||
1314 | if (tb[NFTA_EXPR_DATA]) { | |
1315 | err = nla_parse_nested(info->tb, type->maxattr, | |
1316 | tb[NFTA_EXPR_DATA], type->policy); | |
1317 | if (err < 0) | |
1318 | goto err1; | |
1319 | } else | |
1320 | memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); | |
1321 | ||
1322 | if (type->select_ops != NULL) { | |
0ca743a5 PNA |
1323 | ops = type->select_ops(ctx, |
1324 | (const struct nlattr * const *)info->tb); | |
ef1f7df9 PM |
1325 | if (IS_ERR(ops)) { |
1326 | err = PTR_ERR(ops); | |
1327 | goto err1; | |
1328 | } | |
1329 | } else | |
1330 | ops = type->ops; | |
1331 | ||
96518518 PM |
1332 | info->ops = ops; |
1333 | return 0; | |
ef1f7df9 PM |
1334 | |
1335 | err1: | |
1336 | module_put(type->owner); | |
1337 | return err; | |
96518518 PM |
1338 | } |
1339 | ||
1340 | static int nf_tables_newexpr(const struct nft_ctx *ctx, | |
ef1f7df9 | 1341 | const struct nft_expr_info *info, |
96518518 PM |
1342 | struct nft_expr *expr) |
1343 | { | |
1344 | const struct nft_expr_ops *ops = info->ops; | |
1345 | int err; | |
1346 | ||
1347 | expr->ops = ops; | |
1348 | if (ops->init) { | |
ef1f7df9 | 1349 | err = ops->init(ctx, expr, (const struct nlattr **)info->tb); |
96518518 PM |
1350 | if (err < 0) |
1351 | goto err1; | |
1352 | } | |
1353 | ||
96518518 PM |
1354 | return 0; |
1355 | ||
1356 | err1: | |
1357 | expr->ops = NULL; | |
1358 | return err; | |
1359 | } | |
1360 | ||
62472bce PM |
1361 | static void nf_tables_expr_destroy(const struct nft_ctx *ctx, |
1362 | struct nft_expr *expr) | |
96518518 PM |
1363 | { |
1364 | if (expr->ops->destroy) | |
62472bce | 1365 | expr->ops->destroy(ctx, expr); |
ef1f7df9 | 1366 | module_put(expr->ops->type->owner); |
96518518 PM |
1367 | } |
1368 | ||
1369 | /* | |
1370 | * Rules | |
1371 | */ | |
1372 | ||
1373 | static struct nft_rule *__nf_tables_rule_lookup(const struct nft_chain *chain, | |
1374 | u64 handle) | |
1375 | { | |
1376 | struct nft_rule *rule; | |
1377 | ||
1378 | // FIXME: this sucks | |
1379 | list_for_each_entry(rule, &chain->rules, list) { | |
1380 | if (handle == rule->handle) | |
1381 | return rule; | |
1382 | } | |
1383 | ||
1384 | return ERR_PTR(-ENOENT); | |
1385 | } | |
1386 | ||
1387 | static struct nft_rule *nf_tables_rule_lookup(const struct nft_chain *chain, | |
1388 | const struct nlattr *nla) | |
1389 | { | |
1390 | if (nla == NULL) | |
1391 | return ERR_PTR(-EINVAL); | |
1392 | ||
1393 | return __nf_tables_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); | |
1394 | } | |
1395 | ||
1396 | static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { | |
1397 | [NFTA_RULE_TABLE] = { .type = NLA_STRING }, | |
1398 | [NFTA_RULE_CHAIN] = { .type = NLA_STRING, | |
1399 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
1400 | [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, | |
1401 | [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, | |
0ca743a5 | 1402 | [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, |
5e948466 | 1403 | [NFTA_RULE_POSITION] = { .type = NLA_U64 }, |
0768b3b3 PNA |
1404 | [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, |
1405 | .len = NFT_USERDATA_MAXLEN }, | |
96518518 PM |
1406 | }; |
1407 | ||
1408 | static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq, | |
1409 | int event, u32 flags, int family, | |
1410 | const struct nft_table *table, | |
1411 | const struct nft_chain *chain, | |
1412 | const struct nft_rule *rule) | |
1413 | { | |
1414 | struct nlmsghdr *nlh; | |
1415 | struct nfgenmsg *nfmsg; | |
1416 | const struct nft_expr *expr, *next; | |
1417 | struct nlattr *list; | |
5e948466 EL |
1418 | const struct nft_rule *prule; |
1419 | int type = event | NFNL_SUBSYS_NFTABLES << 8; | |
96518518 | 1420 | |
5e948466 | 1421 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), |
96518518 PM |
1422 | flags); |
1423 | if (nlh == NULL) | |
1424 | goto nla_put_failure; | |
1425 | ||
1426 | nfmsg = nlmsg_data(nlh); | |
1427 | nfmsg->nfgen_family = family; | |
1428 | nfmsg->version = NFNETLINK_V0; | |
1429 | nfmsg->res_id = 0; | |
1430 | ||
1431 | if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) | |
1432 | goto nla_put_failure; | |
1433 | if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) | |
1434 | goto nla_put_failure; | |
1435 | if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle))) | |
1436 | goto nla_put_failure; | |
1437 | ||
5e948466 EL |
1438 | if ((event != NFT_MSG_DELRULE) && (rule->list.prev != &chain->rules)) { |
1439 | prule = list_entry(rule->list.prev, struct nft_rule, list); | |
1440 | if (nla_put_be64(skb, NFTA_RULE_POSITION, | |
1441 | cpu_to_be64(prule->handle))) | |
1442 | goto nla_put_failure; | |
1443 | } | |
1444 | ||
96518518 PM |
1445 | list = nla_nest_start(skb, NFTA_RULE_EXPRESSIONS); |
1446 | if (list == NULL) | |
1447 | goto nla_put_failure; | |
1448 | nft_rule_for_each_expr(expr, next, rule) { | |
1449 | struct nlattr *elem = nla_nest_start(skb, NFTA_LIST_ELEM); | |
1450 | if (elem == NULL) | |
1451 | goto nla_put_failure; | |
1452 | if (nf_tables_fill_expr_info(skb, expr) < 0) | |
1453 | goto nla_put_failure; | |
1454 | nla_nest_end(skb, elem); | |
1455 | } | |
1456 | nla_nest_end(skb, list); | |
1457 | ||
0768b3b3 PNA |
1458 | if (rule->ulen && |
1459 | nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule))) | |
1460 | goto nla_put_failure; | |
1461 | ||
96518518 PM |
1462 | return nlmsg_end(skb, nlh); |
1463 | ||
1464 | nla_put_failure: | |
1465 | nlmsg_trim(skb, nlh); | |
1466 | return -1; | |
1467 | } | |
1468 | ||
35151d84 | 1469 | static int nf_tables_rule_notify(const struct nft_ctx *ctx, |
96518518 | 1470 | const struct nft_rule *rule, |
35151d84 | 1471 | int event) |
96518518 PM |
1472 | { |
1473 | struct sk_buff *skb; | |
96518518 PM |
1474 | int err; |
1475 | ||
128ad332 PNA |
1476 | if (!ctx->report && |
1477 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
96518518 PM |
1478 | return 0; |
1479 | ||
1480 | err = -ENOBUFS; | |
1481 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
1482 | if (skb == NULL) | |
1483 | goto err; | |
1484 | ||
128ad332 | 1485 | err = nf_tables_fill_rule_info(skb, ctx->portid, ctx->seq, event, 0, |
35151d84 PNA |
1486 | ctx->afi->family, ctx->table, |
1487 | ctx->chain, rule); | |
96518518 PM |
1488 | if (err < 0) { |
1489 | kfree_skb(skb); | |
1490 | goto err; | |
1491 | } | |
1492 | ||
128ad332 PNA |
1493 | err = nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES, |
1494 | ctx->report, GFP_KERNEL); | |
96518518 | 1495 | err: |
128ad332 PNA |
1496 | if (err < 0) { |
1497 | nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, | |
1498 | err); | |
1499 | } | |
96518518 PM |
1500 | return err; |
1501 | } | |
1502 | ||
0628b123 PNA |
1503 | static inline bool |
1504 | nft_rule_is_active(struct net *net, const struct nft_rule *rule) | |
1505 | { | |
1506 | return (rule->genmask & (1 << net->nft.gencursor)) == 0; | |
1507 | } | |
1508 | ||
1509 | static inline int gencursor_next(struct net *net) | |
1510 | { | |
1511 | return net->nft.gencursor+1 == 1 ? 1 : 0; | |
1512 | } | |
1513 | ||
1514 | static inline int | |
1515 | nft_rule_is_active_next(struct net *net, const struct nft_rule *rule) | |
1516 | { | |
1517 | return (rule->genmask & (1 << gencursor_next(net))) == 0; | |
1518 | } | |
1519 | ||
1520 | static inline void | |
1521 | nft_rule_activate_next(struct net *net, struct nft_rule *rule) | |
1522 | { | |
1523 | /* Now inactive, will be active in the future */ | |
1524 | rule->genmask = (1 << net->nft.gencursor); | |
1525 | } | |
1526 | ||
1527 | static inline void | |
1528 | nft_rule_disactivate_next(struct net *net, struct nft_rule *rule) | |
1529 | { | |
1530 | rule->genmask = (1 << gencursor_next(net)); | |
1531 | } | |
1532 | ||
1533 | static inline void nft_rule_clear(struct net *net, struct nft_rule *rule) | |
1534 | { | |
1535 | rule->genmask = 0; | |
1536 | } | |
1537 | ||
96518518 PM |
1538 | static int nf_tables_dump_rules(struct sk_buff *skb, |
1539 | struct netlink_callback *cb) | |
1540 | { | |
1541 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
1542 | const struct nft_af_info *afi; | |
1543 | const struct nft_table *table; | |
1544 | const struct nft_chain *chain; | |
1545 | const struct nft_rule *rule; | |
1546 | unsigned int idx = 0, s_idx = cb->args[0]; | |
99633ab2 | 1547 | struct net *net = sock_net(skb->sk); |
96518518 | 1548 | int family = nfmsg->nfgen_family; |
0628b123 PNA |
1549 | u8 genctr = ACCESS_ONCE(net->nft.genctr); |
1550 | u8 gencursor = ACCESS_ONCE(net->nft.gencursor); | |
96518518 | 1551 | |
99633ab2 | 1552 | list_for_each_entry(afi, &net->nft.af_info, list) { |
96518518 PM |
1553 | if (family != NFPROTO_UNSPEC && family != afi->family) |
1554 | continue; | |
1555 | ||
1556 | list_for_each_entry(table, &afi->tables, list) { | |
1557 | list_for_each_entry(chain, &table->chains, list) { | |
1558 | list_for_each_entry(rule, &chain->rules, list) { | |
0628b123 PNA |
1559 | if (!nft_rule_is_active(net, rule)) |
1560 | goto cont; | |
96518518 PM |
1561 | if (idx < s_idx) |
1562 | goto cont; | |
1563 | if (idx > s_idx) | |
1564 | memset(&cb->args[1], 0, | |
1565 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1566 | if (nf_tables_fill_rule_info(skb, NETLINK_CB(cb->skb).portid, | |
1567 | cb->nlh->nlmsg_seq, | |
1568 | NFT_MSG_NEWRULE, | |
1569 | NLM_F_MULTI | NLM_F_APPEND, | |
1570 | afi->family, table, chain, rule) < 0) | |
1571 | goto done; | |
1572 | cont: | |
1573 | idx++; | |
1574 | } | |
1575 | } | |
1576 | } | |
1577 | } | |
1578 | done: | |
0628b123 PNA |
1579 | /* Invalidate this dump, a transition to the new generation happened */ |
1580 | if (gencursor != net->nft.gencursor || genctr != net->nft.genctr) | |
1581 | return -EBUSY; | |
1582 | ||
96518518 PM |
1583 | cb->args[0] = idx; |
1584 | return skb->len; | |
1585 | } | |
1586 | ||
1587 | static int nf_tables_getrule(struct sock *nlsk, struct sk_buff *skb, | |
1588 | const struct nlmsghdr *nlh, | |
1589 | const struct nlattr * const nla[]) | |
1590 | { | |
1591 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
1592 | const struct nft_af_info *afi; | |
1593 | const struct nft_table *table; | |
1594 | const struct nft_chain *chain; | |
1595 | const struct nft_rule *rule; | |
1596 | struct sk_buff *skb2; | |
99633ab2 | 1597 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1598 | int family = nfmsg->nfgen_family; |
1599 | int err; | |
1600 | ||
1601 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
1602 | struct netlink_dump_control c = { | |
1603 | .dump = nf_tables_dump_rules, | |
1604 | }; | |
1605 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
1606 | } | |
1607 | ||
99633ab2 | 1608 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1609 | if (IS_ERR(afi)) |
1610 | return PTR_ERR(afi); | |
1611 | ||
9370761c | 1612 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1613 | if (IS_ERR(table)) |
1614 | return PTR_ERR(table); | |
55dd6f93 PNA |
1615 | if (table->flags & NFT_TABLE_INACTIVE) |
1616 | return -ENOENT; | |
96518518 PM |
1617 | |
1618 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1619 | if (IS_ERR(chain)) | |
1620 | return PTR_ERR(chain); | |
91c7b38d PNA |
1621 | if (chain->flags & NFT_CHAIN_INACTIVE) |
1622 | return -ENOENT; | |
96518518 PM |
1623 | |
1624 | rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); | |
1625 | if (IS_ERR(rule)) | |
1626 | return PTR_ERR(rule); | |
1627 | ||
1628 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1629 | if (!skb2) | |
1630 | return -ENOMEM; | |
1631 | ||
1632 | err = nf_tables_fill_rule_info(skb2, NETLINK_CB(skb).portid, | |
1633 | nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, | |
1634 | family, table, chain, rule); | |
1635 | if (err < 0) | |
1636 | goto err; | |
1637 | ||
1638 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
1639 | ||
1640 | err: | |
1641 | kfree_skb(skb2); | |
1642 | return err; | |
1643 | } | |
1644 | ||
62472bce PM |
1645 | static void nf_tables_rule_destroy(const struct nft_ctx *ctx, |
1646 | struct nft_rule *rule) | |
96518518 | 1647 | { |
96518518 PM |
1648 | struct nft_expr *expr; |
1649 | ||
1650 | /* | |
1651 | * Careful: some expressions might not be initialized in case this | |
1652 | * is called on error from nf_tables_newrule(). | |
1653 | */ | |
1654 | expr = nft_expr_first(rule); | |
1655 | while (expr->ops && expr != nft_expr_last(rule)) { | |
62472bce | 1656 | nf_tables_expr_destroy(ctx, expr); |
96518518 PM |
1657 | expr = nft_expr_next(expr); |
1658 | } | |
1659 | kfree(rule); | |
1660 | } | |
1661 | ||
b380e5c7 | 1662 | static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, |
1081d11b | 1663 | struct nft_rule *rule) |
0628b123 | 1664 | { |
1081d11b | 1665 | struct nft_trans *trans; |
0628b123 | 1666 | |
b380e5c7 | 1667 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); |
1081d11b PNA |
1668 | if (trans == NULL) |
1669 | return NULL; | |
0628b123 | 1670 | |
1081d11b PNA |
1671 | nft_trans_rule(trans) = rule; |
1672 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
0628b123 | 1673 | |
1081d11b | 1674 | return trans; |
0628b123 PNA |
1675 | } |
1676 | ||
1081d11b PNA |
1677 | #define NFT_RULE_MAXEXPRS 128 |
1678 | ||
1679 | static struct nft_expr_info *info; | |
1680 | ||
96518518 PM |
1681 | static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb, |
1682 | const struct nlmsghdr *nlh, | |
1683 | const struct nlattr * const nla[]) | |
1684 | { | |
1685 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1686 | struct nft_af_info *afi; |
99633ab2 | 1687 | struct net *net = sock_net(skb->sk); |
96518518 PM |
1688 | struct nft_table *table; |
1689 | struct nft_chain *chain; | |
1690 | struct nft_rule *rule, *old_rule = NULL; | |
1081d11b | 1691 | struct nft_trans *trans = NULL; |
96518518 PM |
1692 | struct nft_expr *expr; |
1693 | struct nft_ctx ctx; | |
1694 | struct nlattr *tmp; | |
0768b3b3 | 1695 | unsigned int size, i, n, ulen = 0; |
96518518 PM |
1696 | int err, rem; |
1697 | bool create; | |
5e948466 | 1698 | u64 handle, pos_handle; |
96518518 PM |
1699 | |
1700 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; | |
1701 | ||
99633ab2 | 1702 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
96518518 PM |
1703 | if (IS_ERR(afi)) |
1704 | return PTR_ERR(afi); | |
1705 | ||
9370761c | 1706 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1707 | if (IS_ERR(table)) |
1708 | return PTR_ERR(table); | |
1709 | ||
1710 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1711 | if (IS_ERR(chain)) | |
1712 | return PTR_ERR(chain); | |
1713 | ||
1714 | if (nla[NFTA_RULE_HANDLE]) { | |
1715 | handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); | |
1716 | rule = __nf_tables_rule_lookup(chain, handle); | |
1717 | if (IS_ERR(rule)) | |
1718 | return PTR_ERR(rule); | |
1719 | ||
1720 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
1721 | return -EEXIST; | |
1722 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
1723 | old_rule = rule; | |
1724 | else | |
1725 | return -EOPNOTSUPP; | |
1726 | } else { | |
1727 | if (!create || nlh->nlmsg_flags & NLM_F_REPLACE) | |
1728 | return -EINVAL; | |
1729 | handle = nf_tables_alloc_handle(table); | |
1730 | } | |
1731 | ||
5e948466 EL |
1732 | if (nla[NFTA_RULE_POSITION]) { |
1733 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
1734 | return -EOPNOTSUPP; | |
1735 | ||
1736 | pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); | |
1737 | old_rule = __nf_tables_rule_lookup(chain, pos_handle); | |
1738 | if (IS_ERR(old_rule)) | |
1739 | return PTR_ERR(old_rule); | |
1740 | } | |
1741 | ||
0ca743a5 PNA |
1742 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1743 | ||
96518518 PM |
1744 | n = 0; |
1745 | size = 0; | |
1746 | if (nla[NFTA_RULE_EXPRESSIONS]) { | |
1747 | nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { | |
1748 | err = -EINVAL; | |
1749 | if (nla_type(tmp) != NFTA_LIST_ELEM) | |
1750 | goto err1; | |
1751 | if (n == NFT_RULE_MAXEXPRS) | |
1752 | goto err1; | |
0ca743a5 | 1753 | err = nf_tables_expr_parse(&ctx, tmp, &info[n]); |
96518518 PM |
1754 | if (err < 0) |
1755 | goto err1; | |
1756 | size += info[n].ops->size; | |
1757 | n++; | |
1758 | } | |
1759 | } | |
1760 | ||
0768b3b3 PNA |
1761 | if (nla[NFTA_RULE_USERDATA]) |
1762 | ulen = nla_len(nla[NFTA_RULE_USERDATA]); | |
1763 | ||
96518518 | 1764 | err = -ENOMEM; |
0768b3b3 | 1765 | rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL); |
96518518 PM |
1766 | if (rule == NULL) |
1767 | goto err1; | |
1768 | ||
0628b123 PNA |
1769 | nft_rule_activate_next(net, rule); |
1770 | ||
96518518 PM |
1771 | rule->handle = handle; |
1772 | rule->dlen = size; | |
0768b3b3 PNA |
1773 | rule->ulen = ulen; |
1774 | ||
1775 | if (ulen) | |
1776 | nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen); | |
96518518 | 1777 | |
96518518 PM |
1778 | expr = nft_expr_first(rule); |
1779 | for (i = 0; i < n; i++) { | |
1780 | err = nf_tables_newexpr(&ctx, &info[i], expr); | |
1781 | if (err < 0) | |
1782 | goto err2; | |
ef1f7df9 | 1783 | info[i].ops = NULL; |
96518518 PM |
1784 | expr = nft_expr_next(expr); |
1785 | } | |
1786 | ||
96518518 | 1787 | if (nlh->nlmsg_flags & NLM_F_REPLACE) { |
0628b123 | 1788 | if (nft_rule_is_active_next(net, old_rule)) { |
b380e5c7 PNA |
1789 | trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, |
1790 | old_rule); | |
1081d11b | 1791 | if (trans == NULL) { |
0628b123 PNA |
1792 | err = -ENOMEM; |
1793 | goto err2; | |
1794 | } | |
1795 | nft_rule_disactivate_next(net, old_rule); | |
1796 | list_add_tail(&rule->list, &old_rule->list); | |
1797 | } else { | |
1798 | err = -ENOENT; | |
1799 | goto err2; | |
1800 | } | |
96518518 | 1801 | } else if (nlh->nlmsg_flags & NLM_F_APPEND) |
5e948466 EL |
1802 | if (old_rule) |
1803 | list_add_rcu(&rule->list, &old_rule->list); | |
1804 | else | |
1805 | list_add_tail_rcu(&rule->list, &chain->rules); | |
1806 | else { | |
1807 | if (old_rule) | |
1808 | list_add_tail_rcu(&rule->list, &old_rule->list); | |
1809 | else | |
1810 | list_add_rcu(&rule->list, &chain->rules); | |
1811 | } | |
96518518 | 1812 | |
b380e5c7 | 1813 | if (nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule) == NULL) { |
0628b123 PNA |
1814 | err = -ENOMEM; |
1815 | goto err3; | |
1816 | } | |
96518518 PM |
1817 | return 0; |
1818 | ||
0628b123 PNA |
1819 | err3: |
1820 | list_del_rcu(&rule->list); | |
1081d11b PNA |
1821 | if (trans) { |
1822 | list_del_rcu(&nft_trans_rule(trans)->list); | |
1823 | nft_rule_clear(net, nft_trans_rule(trans)); | |
1824 | nft_trans_destroy(trans); | |
0628b123 | 1825 | } |
96518518 | 1826 | err2: |
62472bce | 1827 | nf_tables_rule_destroy(&ctx, rule); |
96518518 PM |
1828 | err1: |
1829 | for (i = 0; i < n; i++) { | |
1830 | if (info[i].ops != NULL) | |
ef1f7df9 | 1831 | module_put(info[i].ops->type->owner); |
96518518 PM |
1832 | } |
1833 | return err; | |
1834 | } | |
1835 | ||
0628b123 PNA |
1836 | static int |
1837 | nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule) | |
1838 | { | |
1839 | /* You cannot delete the same rule twice */ | |
1840 | if (nft_rule_is_active_next(ctx->net, rule)) { | |
b380e5c7 | 1841 | if (nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule) == NULL) |
0628b123 PNA |
1842 | return -ENOMEM; |
1843 | nft_rule_disactivate_next(ctx->net, rule); | |
1844 | return 0; | |
1845 | } | |
1846 | return -ENOENT; | |
1847 | } | |
1848 | ||
cf9dc09d PNA |
1849 | static int nf_table_delrule_by_chain(struct nft_ctx *ctx) |
1850 | { | |
1851 | struct nft_rule *rule; | |
1852 | int err; | |
1853 | ||
1854 | list_for_each_entry(rule, &ctx->chain->rules, list) { | |
1855 | err = nf_tables_delrule_one(ctx, rule); | |
1856 | if (err < 0) | |
1857 | return err; | |
1858 | } | |
1859 | return 0; | |
1860 | } | |
1861 | ||
96518518 PM |
1862 | static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb, |
1863 | const struct nlmsghdr *nlh, | |
1864 | const struct nlattr * const nla[]) | |
1865 | { | |
1866 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 | 1867 | struct nft_af_info *afi; |
99633ab2 | 1868 | struct net *net = sock_net(skb->sk); |
7c95f6d8 | 1869 | struct nft_table *table; |
cf9dc09d PNA |
1870 | struct nft_chain *chain = NULL; |
1871 | struct nft_rule *rule; | |
0628b123 PNA |
1872 | int family = nfmsg->nfgen_family, err = 0; |
1873 | struct nft_ctx ctx; | |
96518518 | 1874 | |
99633ab2 | 1875 | afi = nf_tables_afinfo_lookup(net, family, false); |
96518518 PM |
1876 | if (IS_ERR(afi)) |
1877 | return PTR_ERR(afi); | |
1878 | ||
9370761c | 1879 | table = nf_tables_table_lookup(afi, nla[NFTA_RULE_TABLE]); |
96518518 PM |
1880 | if (IS_ERR(table)) |
1881 | return PTR_ERR(table); | |
55dd6f93 PNA |
1882 | if (table->flags & NFT_TABLE_INACTIVE) |
1883 | return -ENOENT; | |
96518518 | 1884 | |
cf9dc09d PNA |
1885 | if (nla[NFTA_RULE_CHAIN]) { |
1886 | chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]); | |
1887 | if (IS_ERR(chain)) | |
1888 | return PTR_ERR(chain); | |
1889 | } | |
96518518 | 1890 | |
0628b123 PNA |
1891 | nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla); |
1892 | ||
cf9dc09d PNA |
1893 | if (chain) { |
1894 | if (nla[NFTA_RULE_HANDLE]) { | |
1895 | rule = nf_tables_rule_lookup(chain, | |
1896 | nla[NFTA_RULE_HANDLE]); | |
1897 | if (IS_ERR(rule)) | |
1898 | return PTR_ERR(rule); | |
96518518 | 1899 | |
0628b123 | 1900 | err = nf_tables_delrule_one(&ctx, rule); |
cf9dc09d PNA |
1901 | } else { |
1902 | err = nf_table_delrule_by_chain(&ctx); | |
1903 | } | |
1904 | } else { | |
1905 | list_for_each_entry(chain, &table->chains, list) { | |
1906 | ctx.chain = chain; | |
1907 | err = nf_table_delrule_by_chain(&ctx); | |
0628b123 PNA |
1908 | if (err < 0) |
1909 | break; | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | return err; | |
1914 | } | |
1915 | ||
20a69341 PM |
1916 | /* |
1917 | * Sets | |
1918 | */ | |
1919 | ||
1920 | static LIST_HEAD(nf_tables_set_ops); | |
1921 | ||
1922 | int nft_register_set(struct nft_set_ops *ops) | |
1923 | { | |
1924 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1925 | list_add_tail(&ops->list, &nf_tables_set_ops); | |
1926 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1927 | return 0; | |
1928 | } | |
1929 | EXPORT_SYMBOL_GPL(nft_register_set); | |
1930 | ||
1931 | void nft_unregister_set(struct nft_set_ops *ops) | |
1932 | { | |
1933 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1934 | list_del(&ops->list); | |
1935 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1936 | } | |
1937 | EXPORT_SYMBOL_GPL(nft_unregister_set); | |
1938 | ||
c50b960c PM |
1939 | /* |
1940 | * Select a set implementation based on the data characteristics and the | |
1941 | * given policy. The total memory use might not be known if no size is | |
1942 | * given, in that case the amount of memory per element is used. | |
1943 | */ | |
1944 | static const struct nft_set_ops * | |
1945 | nft_select_set_ops(const struct nlattr * const nla[], | |
1946 | const struct nft_set_desc *desc, | |
1947 | enum nft_set_policies policy) | |
20a69341 | 1948 | { |
c50b960c PM |
1949 | const struct nft_set_ops *ops, *bops; |
1950 | struct nft_set_estimate est, best; | |
20a69341 PM |
1951 | u32 features; |
1952 | ||
1953 | #ifdef CONFIG_MODULES | |
1954 | if (list_empty(&nf_tables_set_ops)) { | |
1955 | nfnl_unlock(NFNL_SUBSYS_NFTABLES); | |
1956 | request_module("nft-set"); | |
1957 | nfnl_lock(NFNL_SUBSYS_NFTABLES); | |
1958 | if (!list_empty(&nf_tables_set_ops)) | |
1959 | return ERR_PTR(-EAGAIN); | |
1960 | } | |
1961 | #endif | |
1962 | features = 0; | |
1963 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
1964 | features = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
1965 | features &= NFT_SET_INTERVAL | NFT_SET_MAP; | |
1966 | } | |
1967 | ||
c50b960c PM |
1968 | bops = NULL; |
1969 | best.size = ~0; | |
1970 | best.class = ~0; | |
1971 | ||
20a69341 PM |
1972 | list_for_each_entry(ops, &nf_tables_set_ops, list) { |
1973 | if ((ops->features & features) != features) | |
1974 | continue; | |
c50b960c PM |
1975 | if (!ops->estimate(desc, features, &est)) |
1976 | continue; | |
1977 | ||
1978 | switch (policy) { | |
1979 | case NFT_SET_POL_PERFORMANCE: | |
1980 | if (est.class < best.class) | |
1981 | break; | |
1982 | if (est.class == best.class && est.size < best.size) | |
1983 | break; | |
1984 | continue; | |
1985 | case NFT_SET_POL_MEMORY: | |
1986 | if (est.size < best.size) | |
1987 | break; | |
1988 | if (est.size == best.size && est.class < best.class) | |
1989 | break; | |
1990 | continue; | |
1991 | default: | |
1992 | break; | |
1993 | } | |
1994 | ||
20a69341 PM |
1995 | if (!try_module_get(ops->owner)) |
1996 | continue; | |
c50b960c PM |
1997 | if (bops != NULL) |
1998 | module_put(bops->owner); | |
1999 | ||
2000 | bops = ops; | |
2001 | best = est; | |
20a69341 PM |
2002 | } |
2003 | ||
c50b960c PM |
2004 | if (bops != NULL) |
2005 | return bops; | |
2006 | ||
20a69341 PM |
2007 | return ERR_PTR(-EOPNOTSUPP); |
2008 | } | |
2009 | ||
2010 | static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { | |
2011 | [NFTA_SET_TABLE] = { .type = NLA_STRING }, | |
a9bdd836 PNA |
2012 | [NFTA_SET_NAME] = { .type = NLA_STRING, |
2013 | .len = IFNAMSIZ - 1 }, | |
20a69341 PM |
2014 | [NFTA_SET_FLAGS] = { .type = NLA_U32 }, |
2015 | [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, | |
2016 | [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, | |
2017 | [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, | |
2018 | [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, | |
c50b960c PM |
2019 | [NFTA_SET_POLICY] = { .type = NLA_U32 }, |
2020 | [NFTA_SET_DESC] = { .type = NLA_NESTED }, | |
958bee14 | 2021 | [NFTA_SET_ID] = { .type = NLA_U32 }, |
c50b960c PM |
2022 | }; |
2023 | ||
2024 | static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { | |
2025 | [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, | |
20a69341 PM |
2026 | }; |
2027 | ||
2028 | static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, | |
2029 | const struct sk_buff *skb, | |
2030 | const struct nlmsghdr *nlh, | |
2031 | const struct nlattr * const nla[]) | |
2032 | { | |
99633ab2 | 2033 | struct net *net = sock_net(skb->sk); |
20a69341 | 2034 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
7c95f6d8 PNA |
2035 | struct nft_af_info *afi = NULL; |
2036 | struct nft_table *table = NULL; | |
20a69341 | 2037 | |
c9c8e485 PNA |
2038 | if (nfmsg->nfgen_family != NFPROTO_UNSPEC) { |
2039 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); | |
2040 | if (IS_ERR(afi)) | |
2041 | return PTR_ERR(afi); | |
2042 | } | |
20a69341 PM |
2043 | |
2044 | if (nla[NFTA_SET_TABLE] != NULL) { | |
ec2c9935 PM |
2045 | if (afi == NULL) |
2046 | return -EAFNOSUPPORT; | |
2047 | ||
9370761c | 2048 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2049 | if (IS_ERR(table)) |
2050 | return PTR_ERR(table); | |
55dd6f93 PNA |
2051 | if (table->flags & NFT_TABLE_INACTIVE) |
2052 | return -ENOENT; | |
20a69341 PM |
2053 | } |
2054 | ||
0ca743a5 | 2055 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2056 | return 0; |
2057 | } | |
2058 | ||
2059 | struct nft_set *nf_tables_set_lookup(const struct nft_table *table, | |
2060 | const struct nlattr *nla) | |
2061 | { | |
2062 | struct nft_set *set; | |
2063 | ||
2064 | if (nla == NULL) | |
2065 | return ERR_PTR(-EINVAL); | |
2066 | ||
2067 | list_for_each_entry(set, &table->sets, list) { | |
2068 | if (!nla_strcmp(nla, set->name)) | |
2069 | return set; | |
2070 | } | |
2071 | return ERR_PTR(-ENOENT); | |
2072 | } | |
2073 | ||
958bee14 PNA |
2074 | struct nft_set *nf_tables_set_lookup_byid(const struct net *net, |
2075 | const struct nlattr *nla) | |
2076 | { | |
2077 | struct nft_trans *trans; | |
2078 | u32 id = ntohl(nla_get_be32(nla)); | |
2079 | ||
2080 | list_for_each_entry(trans, &net->nft.commit_list, list) { | |
2081 | if (trans->msg_type == NFT_MSG_NEWSET && | |
2082 | id == nft_trans_set_id(trans)) | |
2083 | return nft_trans_set(trans); | |
2084 | } | |
2085 | return ERR_PTR(-ENOENT); | |
2086 | } | |
2087 | ||
20a69341 PM |
2088 | static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, |
2089 | const char *name) | |
2090 | { | |
2091 | const struct nft_set *i; | |
2092 | const char *p; | |
2093 | unsigned long *inuse; | |
60eb1894 | 2094 | unsigned int n = 0, min = 0; |
20a69341 PM |
2095 | |
2096 | p = strnchr(name, IFNAMSIZ, '%'); | |
2097 | if (p != NULL) { | |
2098 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
2099 | return -EINVAL; | |
2100 | ||
2101 | inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); | |
2102 | if (inuse == NULL) | |
2103 | return -ENOMEM; | |
60eb1894 | 2104 | cont: |
20a69341 | 2105 | list_for_each_entry(i, &ctx->table->sets, list) { |
14662917 DB |
2106 | int tmp; |
2107 | ||
2108 | if (!sscanf(i->name, name, &tmp)) | |
20a69341 | 2109 | continue; |
60eb1894 | 2110 | if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) |
20a69341 | 2111 | continue; |
14662917 | 2112 | |
60eb1894 | 2113 | set_bit(tmp - min, inuse); |
20a69341 PM |
2114 | } |
2115 | ||
53b70287 | 2116 | n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); |
60eb1894 PM |
2117 | if (n >= BITS_PER_BYTE * PAGE_SIZE) { |
2118 | min += BITS_PER_BYTE * PAGE_SIZE; | |
2119 | memset(inuse, 0, PAGE_SIZE); | |
2120 | goto cont; | |
2121 | } | |
20a69341 PM |
2122 | free_page((unsigned long)inuse); |
2123 | } | |
2124 | ||
60eb1894 | 2125 | snprintf(set->name, sizeof(set->name), name, min + n); |
20a69341 PM |
2126 | list_for_each_entry(i, &ctx->table->sets, list) { |
2127 | if (!strcmp(set->name, i->name)) | |
2128 | return -ENFILE; | |
2129 | } | |
2130 | return 0; | |
2131 | } | |
2132 | ||
2133 | static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, | |
2134 | const struct nft_set *set, u16 event, u16 flags) | |
2135 | { | |
2136 | struct nfgenmsg *nfmsg; | |
2137 | struct nlmsghdr *nlh; | |
c50b960c | 2138 | struct nlattr *desc; |
128ad332 PNA |
2139 | u32 portid = ctx->portid; |
2140 | u32 seq = ctx->seq; | |
20a69341 PM |
2141 | |
2142 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2143 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2144 | flags); | |
2145 | if (nlh == NULL) | |
2146 | goto nla_put_failure; | |
2147 | ||
2148 | nfmsg = nlmsg_data(nlh); | |
2149 | nfmsg->nfgen_family = ctx->afi->family; | |
2150 | nfmsg->version = NFNETLINK_V0; | |
2151 | nfmsg->res_id = 0; | |
2152 | ||
2153 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2154 | goto nla_put_failure; | |
2155 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2156 | goto nla_put_failure; | |
2157 | if (set->flags != 0) | |
2158 | if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) | |
2159 | goto nla_put_failure; | |
2160 | ||
2161 | if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) | |
2162 | goto nla_put_failure; | |
2163 | if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) | |
2164 | goto nla_put_failure; | |
2165 | if (set->flags & NFT_SET_MAP) { | |
2166 | if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) | |
2167 | goto nla_put_failure; | |
2168 | if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) | |
2169 | goto nla_put_failure; | |
2170 | } | |
2171 | ||
c50b960c PM |
2172 | desc = nla_nest_start(skb, NFTA_SET_DESC); |
2173 | if (desc == NULL) | |
2174 | goto nla_put_failure; | |
2175 | if (set->size && | |
2176 | nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) | |
2177 | goto nla_put_failure; | |
2178 | nla_nest_end(skb, desc); | |
2179 | ||
20a69341 PM |
2180 | return nlmsg_end(skb, nlh); |
2181 | ||
2182 | nla_put_failure: | |
2183 | nlmsg_trim(skb, nlh); | |
2184 | return -1; | |
2185 | } | |
2186 | ||
2187 | static int nf_tables_set_notify(const struct nft_ctx *ctx, | |
2188 | const struct nft_set *set, | |
2189 | int event) | |
2190 | { | |
2191 | struct sk_buff *skb; | |
128ad332 | 2192 | u32 portid = ctx->portid; |
20a69341 PM |
2193 | int err; |
2194 | ||
128ad332 PNA |
2195 | if (!ctx->report && |
2196 | !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) | |
20a69341 PM |
2197 | return 0; |
2198 | ||
2199 | err = -ENOBUFS; | |
2200 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2201 | if (skb == NULL) | |
2202 | goto err; | |
2203 | ||
2204 | err = nf_tables_fill_set(skb, ctx, set, event, 0); | |
2205 | if (err < 0) { | |
2206 | kfree_skb(skb); | |
2207 | goto err; | |
2208 | } | |
2209 | ||
128ad332 PNA |
2210 | err = nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, |
2211 | ctx->report, GFP_KERNEL); | |
20a69341 PM |
2212 | err: |
2213 | if (err < 0) | |
99633ab2 | 2214 | nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, err); |
20a69341 PM |
2215 | return err; |
2216 | } | |
2217 | ||
2218 | static int nf_tables_dump_sets_table(struct nft_ctx *ctx, struct sk_buff *skb, | |
2219 | struct netlink_callback *cb) | |
2220 | { | |
2221 | const struct nft_set *set; | |
2222 | unsigned int idx = 0, s_idx = cb->args[0]; | |
2223 | ||
2224 | if (cb->args[1]) | |
2225 | return skb->len; | |
2226 | ||
2227 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2228 | if (idx < s_idx) | |
2229 | goto cont; | |
2230 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2231 | NLM_F_MULTI) < 0) { | |
2232 | cb->args[0] = idx; | |
2233 | goto done; | |
2234 | } | |
2235 | cont: | |
2236 | idx++; | |
2237 | } | |
2238 | cb->args[1] = 1; | |
2239 | done: | |
2240 | return skb->len; | |
2241 | } | |
2242 | ||
c9c8e485 PNA |
2243 | static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb, |
2244 | struct netlink_callback *cb) | |
20a69341 PM |
2245 | { |
2246 | const struct nft_set *set; | |
e38195bf | 2247 | unsigned int idx, s_idx = cb->args[0]; |
20a69341 PM |
2248 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2249 | ||
2250 | if (cb->args[1]) | |
2251 | return skb->len; | |
2252 | ||
2253 | list_for_each_entry(table, &ctx->afi->tables, list) { | |
e38195bf PNA |
2254 | if (cur_table) { |
2255 | if (cur_table != table) | |
2256 | continue; | |
20a69341 | 2257 | |
e38195bf PNA |
2258 | cur_table = NULL; |
2259 | } | |
20a69341 | 2260 | ctx->table = table; |
e38195bf | 2261 | idx = 0; |
20a69341 PM |
2262 | list_for_each_entry(set, &ctx->table->sets, list) { |
2263 | if (idx < s_idx) | |
2264 | goto cont; | |
2265 | if (nf_tables_fill_set(skb, ctx, set, NFT_MSG_NEWSET, | |
2266 | NLM_F_MULTI) < 0) { | |
2267 | cb->args[0] = idx; | |
2268 | cb->args[2] = (unsigned long) table; | |
2269 | goto done; | |
2270 | } | |
2271 | cont: | |
2272 | idx++; | |
2273 | } | |
2274 | } | |
2275 | cb->args[1] = 1; | |
2276 | done: | |
2277 | return skb->len; | |
2278 | } | |
2279 | ||
c9c8e485 PNA |
2280 | static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb, |
2281 | struct netlink_callback *cb) | |
2282 | { | |
2283 | const struct nft_set *set; | |
2284 | unsigned int idx, s_idx = cb->args[0]; | |
7c95f6d8 | 2285 | struct nft_af_info *afi; |
c9c8e485 PNA |
2286 | struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; |
2287 | struct net *net = sock_net(skb->sk); | |
2288 | int cur_family = cb->args[3]; | |
2289 | ||
2290 | if (cb->args[1]) | |
2291 | return skb->len; | |
2292 | ||
2293 | list_for_each_entry(afi, &net->nft.af_info, list) { | |
2294 | if (cur_family) { | |
2295 | if (afi->family != cur_family) | |
2296 | continue; | |
2297 | ||
2298 | cur_family = 0; | |
2299 | } | |
2300 | ||
2301 | list_for_each_entry(table, &afi->tables, list) { | |
2302 | if (cur_table) { | |
2303 | if (cur_table != table) | |
2304 | continue; | |
2305 | ||
2306 | cur_table = NULL; | |
2307 | } | |
2308 | ||
2309 | ctx->table = table; | |
2310 | ctx->afi = afi; | |
2311 | idx = 0; | |
2312 | list_for_each_entry(set, &ctx->table->sets, list) { | |
2313 | if (idx < s_idx) | |
2314 | goto cont; | |
2315 | if (nf_tables_fill_set(skb, ctx, set, | |
2316 | NFT_MSG_NEWSET, | |
2317 | NLM_F_MULTI) < 0) { | |
2318 | cb->args[0] = idx; | |
2319 | cb->args[2] = (unsigned long) table; | |
2320 | cb->args[3] = afi->family; | |
2321 | goto done; | |
2322 | } | |
2323 | cont: | |
2324 | idx++; | |
2325 | } | |
2326 | if (s_idx) | |
2327 | s_idx = 0; | |
2328 | } | |
2329 | } | |
2330 | cb->args[1] = 1; | |
2331 | done: | |
2332 | return skb->len; | |
2333 | } | |
2334 | ||
20a69341 PM |
2335 | static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) |
2336 | { | |
2337 | const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); | |
2338 | struct nlattr *nla[NFTA_SET_MAX + 1]; | |
2339 | struct nft_ctx ctx; | |
2340 | int err, ret; | |
2341 | ||
2342 | err = nlmsg_parse(cb->nlh, sizeof(*nfmsg), nla, NFTA_SET_MAX, | |
2343 | nft_set_policy); | |
2344 | if (err < 0) | |
2345 | return err; | |
2346 | ||
2347 | err = nft_ctx_init_from_setattr(&ctx, cb->skb, cb->nlh, (void *)nla); | |
2348 | if (err < 0) | |
2349 | return err; | |
2350 | ||
c9c8e485 PNA |
2351 | if (ctx.table == NULL) { |
2352 | if (ctx.afi == NULL) | |
2353 | ret = nf_tables_dump_sets_all(&ctx, skb, cb); | |
2354 | else | |
2355 | ret = nf_tables_dump_sets_family(&ctx, skb, cb); | |
2356 | } else | |
20a69341 PM |
2357 | ret = nf_tables_dump_sets_table(&ctx, skb, cb); |
2358 | ||
2359 | return ret; | |
2360 | } | |
2361 | ||
958bee14 PNA |
2362 | #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */ |
2363 | ||
20a69341 PM |
2364 | static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, |
2365 | const struct nlmsghdr *nlh, | |
2366 | const struct nlattr * const nla[]) | |
2367 | { | |
2368 | const struct nft_set *set; | |
2369 | struct nft_ctx ctx; | |
2370 | struct sk_buff *skb2; | |
c9c8e485 | 2371 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2372 | int err; |
2373 | ||
2374 | /* Verify existance before starting dump */ | |
2375 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2376 | if (err < 0) | |
2377 | return err; | |
2378 | ||
2379 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2380 | struct netlink_dump_control c = { | |
2381 | .dump = nf_tables_dump_sets, | |
2382 | }; | |
2383 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2384 | } | |
2385 | ||
c9c8e485 PNA |
2386 | /* Only accept unspec with dump */ |
2387 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) | |
2388 | return -EAFNOSUPPORT; | |
2389 | ||
20a69341 PM |
2390 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); |
2391 | if (IS_ERR(set)) | |
2392 | return PTR_ERR(set); | |
958bee14 PNA |
2393 | if (set->flags & NFT_SET_INACTIVE) |
2394 | return -ENOENT; | |
20a69341 PM |
2395 | |
2396 | skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2397 | if (skb2 == NULL) | |
2398 | return -ENOMEM; | |
2399 | ||
2400 | err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); | |
2401 | if (err < 0) | |
2402 | goto err; | |
2403 | ||
2404 | return nlmsg_unicast(nlsk, skb2, NETLINK_CB(skb).portid); | |
2405 | ||
2406 | err: | |
2407 | kfree_skb(skb2); | |
2408 | return err; | |
2409 | } | |
2410 | ||
c50b960c PM |
2411 | static int nf_tables_set_desc_parse(const struct nft_ctx *ctx, |
2412 | struct nft_set_desc *desc, | |
2413 | const struct nlattr *nla) | |
2414 | { | |
2415 | struct nlattr *da[NFTA_SET_DESC_MAX + 1]; | |
2416 | int err; | |
2417 | ||
2418 | err = nla_parse_nested(da, NFTA_SET_DESC_MAX, nla, nft_set_desc_policy); | |
2419 | if (err < 0) | |
2420 | return err; | |
2421 | ||
2422 | if (da[NFTA_SET_DESC_SIZE] != NULL) | |
2423 | desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); | |
2424 | ||
2425 | return 0; | |
2426 | } | |
2427 | ||
958bee14 PNA |
2428 | static int nft_trans_set_add(struct nft_ctx *ctx, int msg_type, |
2429 | struct nft_set *set) | |
2430 | { | |
2431 | struct nft_trans *trans; | |
2432 | ||
2433 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); | |
2434 | if (trans == NULL) | |
2435 | return -ENOMEM; | |
2436 | ||
2437 | if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { | |
2438 | nft_trans_set_id(trans) = | |
2439 | ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); | |
2440 | set->flags |= NFT_SET_INACTIVE; | |
2441 | } | |
2442 | nft_trans_set(trans) = set; | |
2443 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); | |
2444 | ||
2445 | return 0; | |
2446 | } | |
2447 | ||
20a69341 PM |
2448 | static int nf_tables_newset(struct sock *nlsk, struct sk_buff *skb, |
2449 | const struct nlmsghdr *nlh, | |
2450 | const struct nlattr * const nla[]) | |
2451 | { | |
2452 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
2453 | const struct nft_set_ops *ops; | |
7c95f6d8 | 2454 | struct nft_af_info *afi; |
99633ab2 | 2455 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
2456 | struct nft_table *table; |
2457 | struct nft_set *set; | |
2458 | struct nft_ctx ctx; | |
2459 | char name[IFNAMSIZ]; | |
2460 | unsigned int size; | |
2461 | bool create; | |
c50b960c PM |
2462 | u32 ktype, dtype, flags, policy; |
2463 | struct nft_set_desc desc; | |
20a69341 PM |
2464 | int err; |
2465 | ||
2466 | if (nla[NFTA_SET_TABLE] == NULL || | |
2467 | nla[NFTA_SET_NAME] == NULL || | |
958bee14 PNA |
2468 | nla[NFTA_SET_KEY_LEN] == NULL || |
2469 | nla[NFTA_SET_ID] == NULL) | |
20a69341 PM |
2470 | return -EINVAL; |
2471 | ||
c50b960c PM |
2472 | memset(&desc, 0, sizeof(desc)); |
2473 | ||
20a69341 PM |
2474 | ktype = NFT_DATA_VALUE; |
2475 | if (nla[NFTA_SET_KEY_TYPE] != NULL) { | |
2476 | ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); | |
2477 | if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) | |
2478 | return -EINVAL; | |
2479 | } | |
2480 | ||
c50b960c PM |
2481 | desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); |
2482 | if (desc.klen == 0 || desc.klen > FIELD_SIZEOF(struct nft_data, data)) | |
20a69341 PM |
2483 | return -EINVAL; |
2484 | ||
2485 | flags = 0; | |
2486 | if (nla[NFTA_SET_FLAGS] != NULL) { | |
2487 | flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); | |
2488 | if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | | |
2489 | NFT_SET_INTERVAL | NFT_SET_MAP)) | |
2490 | return -EINVAL; | |
2491 | } | |
2492 | ||
2493 | dtype = 0; | |
20a69341 PM |
2494 | if (nla[NFTA_SET_DATA_TYPE] != NULL) { |
2495 | if (!(flags & NFT_SET_MAP)) | |
2496 | return -EINVAL; | |
2497 | ||
2498 | dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); | |
2499 | if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && | |
2500 | dtype != NFT_DATA_VERDICT) | |
2501 | return -EINVAL; | |
2502 | ||
2503 | if (dtype != NFT_DATA_VERDICT) { | |
2504 | if (nla[NFTA_SET_DATA_LEN] == NULL) | |
2505 | return -EINVAL; | |
c50b960c PM |
2506 | desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); |
2507 | if (desc.dlen == 0 || | |
2508 | desc.dlen > FIELD_SIZEOF(struct nft_data, data)) | |
20a69341 PM |
2509 | return -EINVAL; |
2510 | } else | |
c50b960c | 2511 | desc.dlen = sizeof(struct nft_data); |
20a69341 PM |
2512 | } else if (flags & NFT_SET_MAP) |
2513 | return -EINVAL; | |
2514 | ||
c50b960c PM |
2515 | policy = NFT_SET_POL_PERFORMANCE; |
2516 | if (nla[NFTA_SET_POLICY] != NULL) | |
2517 | policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); | |
2518 | ||
2519 | if (nla[NFTA_SET_DESC] != NULL) { | |
2520 | err = nf_tables_set_desc_parse(&ctx, &desc, nla[NFTA_SET_DESC]); | |
2521 | if (err < 0) | |
2522 | return err; | |
2523 | } | |
2524 | ||
20a69341 PM |
2525 | create = nlh->nlmsg_flags & NLM_F_CREATE ? true : false; |
2526 | ||
99633ab2 | 2527 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, create); |
20a69341 PM |
2528 | if (IS_ERR(afi)) |
2529 | return PTR_ERR(afi); | |
2530 | ||
9370761c | 2531 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]); |
20a69341 PM |
2532 | if (IS_ERR(table)) |
2533 | return PTR_ERR(table); | |
2534 | ||
0ca743a5 | 2535 | nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2536 | |
2537 | set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]); | |
2538 | if (IS_ERR(set)) { | |
2539 | if (PTR_ERR(set) != -ENOENT) | |
2540 | return PTR_ERR(set); | |
2541 | set = NULL; | |
2542 | } | |
2543 | ||
2544 | if (set != NULL) { | |
2545 | if (nlh->nlmsg_flags & NLM_F_EXCL) | |
2546 | return -EEXIST; | |
2547 | if (nlh->nlmsg_flags & NLM_F_REPLACE) | |
2548 | return -EOPNOTSUPP; | |
2549 | return 0; | |
2550 | } | |
2551 | ||
2552 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) | |
2553 | return -ENOENT; | |
2554 | ||
c50b960c | 2555 | ops = nft_select_set_ops(nla, &desc, policy); |
20a69341 PM |
2556 | if (IS_ERR(ops)) |
2557 | return PTR_ERR(ops); | |
2558 | ||
2559 | size = 0; | |
2560 | if (ops->privsize != NULL) | |
2561 | size = ops->privsize(nla); | |
2562 | ||
2563 | err = -ENOMEM; | |
2564 | set = kzalloc(sizeof(*set) + size, GFP_KERNEL); | |
2565 | if (set == NULL) | |
2566 | goto err1; | |
2567 | ||
2568 | nla_strlcpy(name, nla[NFTA_SET_NAME], sizeof(set->name)); | |
2569 | err = nf_tables_set_alloc_name(&ctx, set, name); | |
2570 | if (err < 0) | |
2571 | goto err2; | |
2572 | ||
2573 | INIT_LIST_HEAD(&set->bindings); | |
2574 | set->ops = ops; | |
2575 | set->ktype = ktype; | |
c50b960c | 2576 | set->klen = desc.klen; |
20a69341 | 2577 | set->dtype = dtype; |
c50b960c | 2578 | set->dlen = desc.dlen; |
20a69341 | 2579 | set->flags = flags; |
c50b960c | 2580 | set->size = desc.size; |
20a69341 | 2581 | |
c50b960c | 2582 | err = ops->init(set, &desc, nla); |
20a69341 PM |
2583 | if (err < 0) |
2584 | goto err2; | |
2585 | ||
958bee14 | 2586 | err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); |
20a69341 PM |
2587 | if (err < 0) |
2588 | goto err2; | |
2589 | ||
2590 | list_add_tail(&set->list, &table->sets); | |
20a69341 PM |
2591 | return 0; |
2592 | ||
2593 | err2: | |
2594 | kfree(set); | |
2595 | err1: | |
2596 | module_put(ops->owner); | |
2597 | return err; | |
2598 | } | |
2599 | ||
958bee14 | 2600 | static void nft_set_destroy(struct nft_set *set) |
20a69341 | 2601 | { |
20a69341 PM |
2602 | set->ops->destroy(set); |
2603 | module_put(set->ops->owner); | |
2604 | kfree(set); | |
2605 | } | |
2606 | ||
958bee14 PNA |
2607 | static void nf_tables_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) |
2608 | { | |
2609 | list_del(&set->list); | |
2610 | nf_tables_set_notify(ctx, set, NFT_MSG_DELSET); | |
2611 | nft_set_destroy(set); | |
2612 | } | |
2613 | ||
20a69341 PM |
2614 | static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb, |
2615 | const struct nlmsghdr *nlh, | |
2616 | const struct nlattr * const nla[]) | |
2617 | { | |
c9c8e485 | 2618 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); |
20a69341 PM |
2619 | struct nft_set *set; |
2620 | struct nft_ctx ctx; | |
2621 | int err; | |
2622 | ||
ec2c9935 PM |
2623 | if (nfmsg->nfgen_family == NFPROTO_UNSPEC) |
2624 | return -EAFNOSUPPORT; | |
20a69341 PM |
2625 | if (nla[NFTA_SET_TABLE] == NULL) |
2626 | return -EINVAL; | |
2627 | ||
2628 | err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); | |
2629 | if (err < 0) | |
2630 | return err; | |
2631 | ||
2632 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]); | |
2633 | if (IS_ERR(set)) | |
2634 | return PTR_ERR(set); | |
958bee14 PNA |
2635 | if (set->flags & NFT_SET_INACTIVE) |
2636 | return -ENOENT; | |
20a69341 PM |
2637 | if (!list_empty(&set->bindings)) |
2638 | return -EBUSY; | |
2639 | ||
958bee14 PNA |
2640 | err = nft_trans_set_add(&ctx, NFT_MSG_DELSET, set); |
2641 | if (err < 0) | |
2642 | return err; | |
2643 | ||
2644 | list_del(&set->list); | |
20a69341 PM |
2645 | return 0; |
2646 | } | |
2647 | ||
2648 | static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, | |
2649 | const struct nft_set *set, | |
2650 | const struct nft_set_iter *iter, | |
2651 | const struct nft_set_elem *elem) | |
2652 | { | |
2653 | enum nft_registers dreg; | |
2654 | ||
2655 | dreg = nft_type_to_reg(set->dtype); | |
2ee0d3c8 PNA |
2656 | return nft_validate_data_load(ctx, dreg, &elem->data, |
2657 | set->dtype == NFT_DATA_VERDICT ? | |
2658 | NFT_DATA_VERDICT : NFT_DATA_VALUE); | |
20a69341 PM |
2659 | } |
2660 | ||
2661 | int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2662 | struct nft_set_binding *binding) | |
2663 | { | |
2664 | struct nft_set_binding *i; | |
2665 | struct nft_set_iter iter; | |
2666 | ||
2667 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS) | |
2668 | return -EBUSY; | |
2669 | ||
2670 | if (set->flags & NFT_SET_MAP) { | |
2671 | /* If the set is already bound to the same chain all | |
2672 | * jumps are already validated for that chain. | |
2673 | */ | |
2674 | list_for_each_entry(i, &set->bindings, list) { | |
2675 | if (i->chain == binding->chain) | |
2676 | goto bind; | |
2677 | } | |
2678 | ||
2679 | iter.skip = 0; | |
2680 | iter.count = 0; | |
2681 | iter.err = 0; | |
2682 | iter.fn = nf_tables_bind_check_setelem; | |
2683 | ||
2684 | set->ops->walk(ctx, set, &iter); | |
2685 | if (iter.err < 0) { | |
2686 | /* Destroy anonymous sets if binding fails */ | |
2687 | if (set->flags & NFT_SET_ANONYMOUS) | |
2688 | nf_tables_set_destroy(ctx, set); | |
2689 | ||
2690 | return iter.err; | |
2691 | } | |
2692 | } | |
2693 | bind: | |
2694 | binding->chain = ctx->chain; | |
2695 | list_add_tail(&binding->list, &set->bindings); | |
2696 | return 0; | |
2697 | } | |
2698 | ||
2699 | void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, | |
2700 | struct nft_set_binding *binding) | |
2701 | { | |
2702 | list_del(&binding->list); | |
2703 | ||
958bee14 PNA |
2704 | if (list_empty(&set->bindings) && set->flags & NFT_SET_ANONYMOUS && |
2705 | !(set->flags & NFT_SET_INACTIVE)) | |
20a69341 PM |
2706 | nf_tables_set_destroy(ctx, set); |
2707 | } | |
2708 | ||
2709 | /* | |
2710 | * Set elements | |
2711 | */ | |
2712 | ||
2713 | static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { | |
2714 | [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, | |
2715 | [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, | |
2716 | [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, | |
2717 | }; | |
2718 | ||
2719 | static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { | |
2720 | [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING }, | |
2721 | [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING }, | |
2722 | [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, | |
958bee14 | 2723 | [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, |
20a69341 PM |
2724 | }; |
2725 | ||
2726 | static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, | |
2727 | const struct sk_buff *skb, | |
2728 | const struct nlmsghdr *nlh, | |
55dd6f93 PNA |
2729 | const struct nlattr * const nla[], |
2730 | bool trans) | |
20a69341 PM |
2731 | { |
2732 | const struct nfgenmsg *nfmsg = nlmsg_data(nlh); | |
7c95f6d8 PNA |
2733 | struct nft_af_info *afi; |
2734 | struct nft_table *table; | |
99633ab2 | 2735 | struct net *net = sock_net(skb->sk); |
20a69341 | 2736 | |
99633ab2 | 2737 | afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false); |
20a69341 PM |
2738 | if (IS_ERR(afi)) |
2739 | return PTR_ERR(afi); | |
2740 | ||
9370761c | 2741 | table = nf_tables_table_lookup(afi, nla[NFTA_SET_ELEM_LIST_TABLE]); |
20a69341 PM |
2742 | if (IS_ERR(table)) |
2743 | return PTR_ERR(table); | |
55dd6f93 PNA |
2744 | if (!trans && (table->flags & NFT_TABLE_INACTIVE)) |
2745 | return -ENOENT; | |
20a69341 | 2746 | |
0ca743a5 | 2747 | nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla); |
20a69341 PM |
2748 | return 0; |
2749 | } | |
2750 | ||
2751 | static int nf_tables_fill_setelem(struct sk_buff *skb, | |
2752 | const struct nft_set *set, | |
2753 | const struct nft_set_elem *elem) | |
2754 | { | |
2755 | unsigned char *b = skb_tail_pointer(skb); | |
2756 | struct nlattr *nest; | |
2757 | ||
2758 | nest = nla_nest_start(skb, NFTA_LIST_ELEM); | |
2759 | if (nest == NULL) | |
2760 | goto nla_put_failure; | |
2761 | ||
2762 | if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, &elem->key, NFT_DATA_VALUE, | |
2763 | set->klen) < 0) | |
2764 | goto nla_put_failure; | |
2765 | ||
2766 | if (set->flags & NFT_SET_MAP && | |
2767 | !(elem->flags & NFT_SET_ELEM_INTERVAL_END) && | |
2768 | nft_data_dump(skb, NFTA_SET_ELEM_DATA, &elem->data, | |
2769 | set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, | |
2770 | set->dlen) < 0) | |
2771 | goto nla_put_failure; | |
2772 | ||
2773 | if (elem->flags != 0) | |
2774 | if (nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, htonl(elem->flags))) | |
2775 | goto nla_put_failure; | |
2776 | ||
2777 | nla_nest_end(skb, nest); | |
2778 | return 0; | |
2779 | ||
2780 | nla_put_failure: | |
2781 | nlmsg_trim(skb, b); | |
2782 | return -EMSGSIZE; | |
2783 | } | |
2784 | ||
2785 | struct nft_set_dump_args { | |
2786 | const struct netlink_callback *cb; | |
2787 | struct nft_set_iter iter; | |
2788 | struct sk_buff *skb; | |
2789 | }; | |
2790 | ||
2791 | static int nf_tables_dump_setelem(const struct nft_ctx *ctx, | |
2792 | const struct nft_set *set, | |
2793 | const struct nft_set_iter *iter, | |
2794 | const struct nft_set_elem *elem) | |
2795 | { | |
2796 | struct nft_set_dump_args *args; | |
2797 | ||
2798 | args = container_of(iter, struct nft_set_dump_args, iter); | |
2799 | return nf_tables_fill_setelem(args->skb, set, elem); | |
2800 | } | |
2801 | ||
2802 | static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) | |
2803 | { | |
2804 | const struct nft_set *set; | |
2805 | struct nft_set_dump_args args; | |
2806 | struct nft_ctx ctx; | |
2807 | struct nlattr *nla[NFTA_SET_ELEM_LIST_MAX + 1]; | |
2808 | struct nfgenmsg *nfmsg; | |
2809 | struct nlmsghdr *nlh; | |
2810 | struct nlattr *nest; | |
2811 | u32 portid, seq; | |
2812 | int event, err; | |
2813 | ||
720e0dfa MN |
2814 | err = nlmsg_parse(cb->nlh, sizeof(struct nfgenmsg), nla, |
2815 | NFTA_SET_ELEM_LIST_MAX, nft_set_elem_list_policy); | |
20a69341 PM |
2816 | if (err < 0) |
2817 | return err; | |
2818 | ||
55dd6f93 PNA |
2819 | err = nft_ctx_init_from_elemattr(&ctx, cb->skb, cb->nlh, (void *)nla, |
2820 | false); | |
20a69341 PM |
2821 | if (err < 0) |
2822 | return err; | |
2823 | ||
2824 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2825 | if (IS_ERR(set)) | |
2826 | return PTR_ERR(set); | |
958bee14 PNA |
2827 | if (set->flags & NFT_SET_INACTIVE) |
2828 | return -ENOENT; | |
20a69341 PM |
2829 | |
2830 | event = NFT_MSG_NEWSETELEM; | |
2831 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2832 | portid = NETLINK_CB(cb->skb).portid; | |
2833 | seq = cb->nlh->nlmsg_seq; | |
2834 | ||
2835 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2836 | NLM_F_MULTI); | |
2837 | if (nlh == NULL) | |
2838 | goto nla_put_failure; | |
2839 | ||
2840 | nfmsg = nlmsg_data(nlh); | |
2841 | nfmsg->nfgen_family = NFPROTO_UNSPEC; | |
2842 | nfmsg->version = NFNETLINK_V0; | |
2843 | nfmsg->res_id = 0; | |
2844 | ||
2845 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, ctx.table->name)) | |
2846 | goto nla_put_failure; | |
2847 | if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) | |
2848 | goto nla_put_failure; | |
2849 | ||
2850 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2851 | if (nest == NULL) | |
2852 | goto nla_put_failure; | |
2853 | ||
2854 | args.cb = cb; | |
2855 | args.skb = skb; | |
2856 | args.iter.skip = cb->args[0]; | |
2857 | args.iter.count = 0; | |
2858 | args.iter.err = 0; | |
2859 | args.iter.fn = nf_tables_dump_setelem; | |
2860 | set->ops->walk(&ctx, set, &args.iter); | |
2861 | ||
2862 | nla_nest_end(skb, nest); | |
2863 | nlmsg_end(skb, nlh); | |
2864 | ||
2865 | if (args.iter.err && args.iter.err != -EMSGSIZE) | |
2866 | return args.iter.err; | |
2867 | if (args.iter.count == cb->args[0]) | |
2868 | return 0; | |
2869 | ||
2870 | cb->args[0] = args.iter.count; | |
2871 | return skb->len; | |
2872 | ||
2873 | nla_put_failure: | |
2874 | return -ENOSPC; | |
2875 | } | |
2876 | ||
2877 | static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb, | |
2878 | const struct nlmsghdr *nlh, | |
2879 | const struct nlattr * const nla[]) | |
2880 | { | |
2881 | const struct nft_set *set; | |
2882 | struct nft_ctx ctx; | |
2883 | int err; | |
2884 | ||
55dd6f93 | 2885 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
20a69341 PM |
2886 | if (err < 0) |
2887 | return err; | |
2888 | ||
2889 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
2890 | if (IS_ERR(set)) | |
2891 | return PTR_ERR(set); | |
958bee14 PNA |
2892 | if (set->flags & NFT_SET_INACTIVE) |
2893 | return -ENOENT; | |
20a69341 PM |
2894 | |
2895 | if (nlh->nlmsg_flags & NLM_F_DUMP) { | |
2896 | struct netlink_dump_control c = { | |
2897 | .dump = nf_tables_dump_set, | |
2898 | }; | |
2899 | return netlink_dump_start(nlsk, skb, nlh, &c); | |
2900 | } | |
2901 | return -EOPNOTSUPP; | |
2902 | } | |
2903 | ||
d60ce62f AB |
2904 | static int nf_tables_fill_setelem_info(struct sk_buff *skb, |
2905 | const struct nft_ctx *ctx, u32 seq, | |
2906 | u32 portid, int event, u16 flags, | |
2907 | const struct nft_set *set, | |
2908 | const struct nft_set_elem *elem) | |
2909 | { | |
2910 | struct nfgenmsg *nfmsg; | |
2911 | struct nlmsghdr *nlh; | |
2912 | struct nlattr *nest; | |
2913 | int err; | |
2914 | ||
2915 | event |= NFNL_SUBSYS_NFTABLES << 8; | |
2916 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), | |
2917 | flags); | |
2918 | if (nlh == NULL) | |
2919 | goto nla_put_failure; | |
2920 | ||
2921 | nfmsg = nlmsg_data(nlh); | |
2922 | nfmsg->nfgen_family = ctx->afi->family; | |
2923 | nfmsg->version = NFNETLINK_V0; | |
2924 | nfmsg->res_id = 0; | |
2925 | ||
2926 | if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) | |
2927 | goto nla_put_failure; | |
2928 | if (nla_put_string(skb, NFTA_SET_NAME, set->name)) | |
2929 | goto nla_put_failure; | |
2930 | ||
2931 | nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS); | |
2932 | if (nest == NULL) | |
2933 | goto nla_put_failure; | |
2934 | ||
2935 | err = nf_tables_fill_setelem(skb, set, elem); | |
2936 | if (err < 0) | |
2937 | goto nla_put_failure; | |
2938 | ||
2939 | nla_nest_end(skb, nest); | |
2940 | ||
2941 | return nlmsg_end(skb, nlh); | |
2942 | ||
2943 | nla_put_failure: | |
2944 | nlmsg_trim(skb, nlh); | |
2945 | return -1; | |
2946 | } | |
2947 | ||
2948 | static int nf_tables_setelem_notify(const struct nft_ctx *ctx, | |
2949 | const struct nft_set *set, | |
2950 | const struct nft_set_elem *elem, | |
2951 | int event, u16 flags) | |
2952 | { | |
128ad332 PNA |
2953 | struct net *net = ctx->net; |
2954 | u32 portid = ctx->portid; | |
d60ce62f AB |
2955 | struct sk_buff *skb; |
2956 | int err; | |
2957 | ||
128ad332 | 2958 | if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) |
d60ce62f AB |
2959 | return 0; |
2960 | ||
2961 | err = -ENOBUFS; | |
2962 | skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
2963 | if (skb == NULL) | |
2964 | goto err; | |
2965 | ||
2966 | err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, | |
2967 | set, elem); | |
2968 | if (err < 0) { | |
2969 | kfree_skb(skb); | |
2970 | goto err; | |
2971 | } | |
2972 | ||
128ad332 | 2973 | err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report, |
d60ce62f AB |
2974 | GFP_KERNEL); |
2975 | err: | |
2976 | if (err < 0) | |
2977 | nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err); | |
2978 | return err; | |
2979 | } | |
2980 | ||
60319eb1 PNA |
2981 | static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, |
2982 | int msg_type, | |
2983 | struct nft_set *set) | |
2984 | { | |
2985 | struct nft_trans *trans; | |
2986 | ||
2987 | trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); | |
2988 | if (trans == NULL) | |
2989 | return NULL; | |
2990 | ||
2991 | nft_trans_elem_set(trans) = set; | |
2992 | return trans; | |
2993 | } | |
2994 | ||
2995 | static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, | |
20a69341 PM |
2996 | const struct nlattr *attr) |
2997 | { | |
2998 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
2999 | struct nft_data_desc d1, d2; | |
3000 | struct nft_set_elem elem; | |
3001 | struct nft_set_binding *binding; | |
3002 | enum nft_registers dreg; | |
60319eb1 | 3003 | struct nft_trans *trans; |
20a69341 PM |
3004 | int err; |
3005 | ||
c50b960c PM |
3006 | if (set->size && set->nelems == set->size) |
3007 | return -ENFILE; | |
3008 | ||
20a69341 PM |
3009 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, |
3010 | nft_set_elem_policy); | |
3011 | if (err < 0) | |
3012 | return err; | |
3013 | ||
3014 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3015 | return -EINVAL; | |
3016 | ||
3017 | elem.flags = 0; | |
3018 | if (nla[NFTA_SET_ELEM_FLAGS] != NULL) { | |
3019 | elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS])); | |
3020 | if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END) | |
3021 | return -EINVAL; | |
3022 | } | |
3023 | ||
3024 | if (set->flags & NFT_SET_MAP) { | |
3025 | if (nla[NFTA_SET_ELEM_DATA] == NULL && | |
3026 | !(elem.flags & NFT_SET_ELEM_INTERVAL_END)) | |
3027 | return -EINVAL; | |
bd7fc645 PNA |
3028 | if (nla[NFTA_SET_ELEM_DATA] != NULL && |
3029 | elem.flags & NFT_SET_ELEM_INTERVAL_END) | |
3030 | return -EINVAL; | |
20a69341 PM |
3031 | } else { |
3032 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3033 | return -EINVAL; | |
3034 | } | |
3035 | ||
3036 | err = nft_data_init(ctx, &elem.key, &d1, nla[NFTA_SET_ELEM_KEY]); | |
3037 | if (err < 0) | |
3038 | goto err1; | |
3039 | err = -EINVAL; | |
3040 | if (d1.type != NFT_DATA_VALUE || d1.len != set->klen) | |
3041 | goto err2; | |
3042 | ||
3043 | err = -EEXIST; | |
3044 | if (set->ops->get(set, &elem) == 0) | |
3045 | goto err2; | |
3046 | ||
3047 | if (nla[NFTA_SET_ELEM_DATA] != NULL) { | |
3048 | err = nft_data_init(ctx, &elem.data, &d2, nla[NFTA_SET_ELEM_DATA]); | |
3049 | if (err < 0) | |
3050 | goto err2; | |
3051 | ||
3052 | err = -EINVAL; | |
3053 | if (set->dtype != NFT_DATA_VERDICT && d2.len != set->dlen) | |
3054 | goto err3; | |
3055 | ||
3056 | dreg = nft_type_to_reg(set->dtype); | |
3057 | list_for_each_entry(binding, &set->bindings, list) { | |
3058 | struct nft_ctx bind_ctx = { | |
3059 | .afi = ctx->afi, | |
3060 | .table = ctx->table, | |
7c95f6d8 | 3061 | .chain = (struct nft_chain *)binding->chain, |
20a69341 PM |
3062 | }; |
3063 | ||
3064 | err = nft_validate_data_load(&bind_ctx, dreg, | |
3065 | &elem.data, d2.type); | |
3066 | if (err < 0) | |
3067 | goto err3; | |
3068 | } | |
3069 | } | |
3070 | ||
60319eb1 PNA |
3071 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); |
3072 | if (trans == NULL) | |
3073 | goto err3; | |
3074 | ||
20a69341 PM |
3075 | err = set->ops->insert(set, &elem); |
3076 | if (err < 0) | |
60319eb1 | 3077 | goto err4; |
20a69341 | 3078 | |
60319eb1 | 3079 | nft_trans_elem(trans) = elem; |
46bbafce | 3080 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3081 | return 0; |
3082 | ||
60319eb1 PNA |
3083 | err4: |
3084 | kfree(trans); | |
20a69341 PM |
3085 | err3: |
3086 | if (nla[NFTA_SET_ELEM_DATA] != NULL) | |
3087 | nft_data_uninit(&elem.data, d2.type); | |
3088 | err2: | |
3089 | nft_data_uninit(&elem.key, d1.type); | |
3090 | err1: | |
3091 | return err; | |
3092 | } | |
3093 | ||
3094 | static int nf_tables_newsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3095 | const struct nlmsghdr *nlh, | |
3096 | const struct nlattr * const nla[]) | |
3097 | { | |
958bee14 | 3098 | struct net *net = sock_net(skb->sk); |
20a69341 PM |
3099 | const struct nlattr *attr; |
3100 | struct nft_set *set; | |
3101 | struct nft_ctx ctx; | |
60319eb1 | 3102 | int rem, err = 0; |
20a69341 | 3103 | |
55dd6f93 | 3104 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, true); |
20a69341 PM |
3105 | if (err < 0) |
3106 | return err; | |
3107 | ||
3108 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
958bee14 PNA |
3109 | if (IS_ERR(set)) { |
3110 | if (nla[NFTA_SET_ELEM_LIST_SET_ID]) { | |
3111 | set = nf_tables_set_lookup_byid(net, | |
3112 | nla[NFTA_SET_ELEM_LIST_SET_ID]); | |
3113 | } | |
3114 | if (IS_ERR(set)) | |
3115 | return PTR_ERR(set); | |
3116 | } | |
3117 | ||
20a69341 PM |
3118 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) |
3119 | return -EBUSY; | |
3120 | ||
3121 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3122 | err = nft_add_set_elem(&ctx, set, attr); | |
3123 | if (err < 0) | |
60319eb1 | 3124 | break; |
20a69341 | 3125 | } |
60319eb1 | 3126 | return err; |
20a69341 PM |
3127 | } |
3128 | ||
60319eb1 | 3129 | static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, |
20a69341 PM |
3130 | const struct nlattr *attr) |
3131 | { | |
3132 | struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; | |
3133 | struct nft_data_desc desc; | |
3134 | struct nft_set_elem elem; | |
60319eb1 | 3135 | struct nft_trans *trans; |
20a69341 PM |
3136 | int err; |
3137 | ||
3138 | err = nla_parse_nested(nla, NFTA_SET_ELEM_MAX, attr, | |
3139 | nft_set_elem_policy); | |
3140 | if (err < 0) | |
3141 | goto err1; | |
3142 | ||
3143 | err = -EINVAL; | |
3144 | if (nla[NFTA_SET_ELEM_KEY] == NULL) | |
3145 | goto err1; | |
3146 | ||
3147 | err = nft_data_init(ctx, &elem.key, &desc, nla[NFTA_SET_ELEM_KEY]); | |
3148 | if (err < 0) | |
3149 | goto err1; | |
3150 | ||
3151 | err = -EINVAL; | |
3152 | if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) | |
3153 | goto err2; | |
3154 | ||
3155 | err = set->ops->get(set, &elem); | |
3156 | if (err < 0) | |
3157 | goto err2; | |
3158 | ||
60319eb1 PNA |
3159 | trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); |
3160 | if (trans == NULL) | |
3161 | goto err2; | |
20a69341 | 3162 | |
60319eb1 | 3163 | nft_trans_elem(trans) = elem; |
46bbafce | 3164 | list_add_tail(&trans->list, &ctx->net->nft.commit_list); |
20a69341 PM |
3165 | |
3166 | nft_data_uninit(&elem.key, NFT_DATA_VALUE); | |
3167 | if (set->flags & NFT_SET_MAP) | |
3168 | nft_data_uninit(&elem.data, set->dtype); | |
3169 | ||
3170 | err2: | |
3171 | nft_data_uninit(&elem.key, desc.type); | |
3172 | err1: | |
3173 | return err; | |
3174 | } | |
3175 | ||
3176 | static int nf_tables_delsetelem(struct sock *nlsk, struct sk_buff *skb, | |
3177 | const struct nlmsghdr *nlh, | |
3178 | const struct nlattr * const nla[]) | |
3179 | { | |
3180 | const struct nlattr *attr; | |
3181 | struct nft_set *set; | |
3182 | struct nft_ctx ctx; | |
60319eb1 | 3183 | int rem, err = 0; |
20a69341 | 3184 | |
55dd6f93 | 3185 | err = nft_ctx_init_from_elemattr(&ctx, skb, nlh, nla, false); |
20a69341 PM |
3186 | if (err < 0) |
3187 | return err; | |
3188 | ||
3189 | set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET]); | |
3190 | if (IS_ERR(set)) | |
3191 | return PTR_ERR(set); | |
3192 | if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) | |
3193 | return -EBUSY; | |
3194 | ||
3195 | nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { | |
3196 | err = nft_del_setelem(&ctx, set, attr); | |
3197 | if (err < 0) | |
60319eb1 | 3198 | break; |
20a69341 | 3199 | } |
60319eb1 | 3200 | return err; |
20a69341 PM |
3201 | } |
3202 | ||
96518518 PM |
3203 | static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { |
3204 | [NFT_MSG_NEWTABLE] = { | |
55dd6f93 | 3205 | .call_batch = nf_tables_newtable, |
96518518 PM |
3206 | .attr_count = NFTA_TABLE_MAX, |
3207 | .policy = nft_table_policy, | |
3208 | }, | |
3209 | [NFT_MSG_GETTABLE] = { | |
3210 | .call = nf_tables_gettable, | |
3211 | .attr_count = NFTA_TABLE_MAX, | |
3212 | .policy = nft_table_policy, | |
3213 | }, | |
3214 | [NFT_MSG_DELTABLE] = { | |
55dd6f93 | 3215 | .call_batch = nf_tables_deltable, |
96518518 PM |
3216 | .attr_count = NFTA_TABLE_MAX, |
3217 | .policy = nft_table_policy, | |
3218 | }, | |
3219 | [NFT_MSG_NEWCHAIN] = { | |
91c7b38d | 3220 | .call_batch = nf_tables_newchain, |
96518518 PM |
3221 | .attr_count = NFTA_CHAIN_MAX, |
3222 | .policy = nft_chain_policy, | |
3223 | }, | |
3224 | [NFT_MSG_GETCHAIN] = { | |
3225 | .call = nf_tables_getchain, | |
3226 | .attr_count = NFTA_CHAIN_MAX, | |
3227 | .policy = nft_chain_policy, | |
3228 | }, | |
3229 | [NFT_MSG_DELCHAIN] = { | |
91c7b38d | 3230 | .call_batch = nf_tables_delchain, |
96518518 PM |
3231 | .attr_count = NFTA_CHAIN_MAX, |
3232 | .policy = nft_chain_policy, | |
3233 | }, | |
3234 | [NFT_MSG_NEWRULE] = { | |
0628b123 | 3235 | .call_batch = nf_tables_newrule, |
96518518 PM |
3236 | .attr_count = NFTA_RULE_MAX, |
3237 | .policy = nft_rule_policy, | |
3238 | }, | |
3239 | [NFT_MSG_GETRULE] = { | |
3240 | .call = nf_tables_getrule, | |
3241 | .attr_count = NFTA_RULE_MAX, | |
3242 | .policy = nft_rule_policy, | |
3243 | }, | |
3244 | [NFT_MSG_DELRULE] = { | |
0628b123 | 3245 | .call_batch = nf_tables_delrule, |
96518518 PM |
3246 | .attr_count = NFTA_RULE_MAX, |
3247 | .policy = nft_rule_policy, | |
3248 | }, | |
20a69341 | 3249 | [NFT_MSG_NEWSET] = { |
958bee14 | 3250 | .call_batch = nf_tables_newset, |
20a69341 PM |
3251 | .attr_count = NFTA_SET_MAX, |
3252 | .policy = nft_set_policy, | |
3253 | }, | |
3254 | [NFT_MSG_GETSET] = { | |
3255 | .call = nf_tables_getset, | |
3256 | .attr_count = NFTA_SET_MAX, | |
3257 | .policy = nft_set_policy, | |
3258 | }, | |
3259 | [NFT_MSG_DELSET] = { | |
958bee14 | 3260 | .call_batch = nf_tables_delset, |
20a69341 PM |
3261 | .attr_count = NFTA_SET_MAX, |
3262 | .policy = nft_set_policy, | |
3263 | }, | |
3264 | [NFT_MSG_NEWSETELEM] = { | |
958bee14 | 3265 | .call_batch = nf_tables_newsetelem, |
20a69341 PM |
3266 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3267 | .policy = nft_set_elem_list_policy, | |
3268 | }, | |
3269 | [NFT_MSG_GETSETELEM] = { | |
3270 | .call = nf_tables_getsetelem, | |
3271 | .attr_count = NFTA_SET_ELEM_LIST_MAX, | |
3272 | .policy = nft_set_elem_list_policy, | |
3273 | }, | |
3274 | [NFT_MSG_DELSETELEM] = { | |
958bee14 | 3275 | .call_batch = nf_tables_delsetelem, |
20a69341 PM |
3276 | .attr_count = NFTA_SET_ELEM_LIST_MAX, |
3277 | .policy = nft_set_elem_list_policy, | |
3278 | }, | |
96518518 PM |
3279 | }; |
3280 | ||
91c7b38d PNA |
3281 | static void nft_chain_commit_update(struct nft_trans *trans) |
3282 | { | |
3283 | struct nft_base_chain *basechain; | |
3284 | ||
3285 | if (nft_trans_chain_name(trans)[0]) | |
3286 | strcpy(trans->ctx.chain->name, nft_trans_chain_name(trans)); | |
3287 | ||
3288 | if (!(trans->ctx.chain->flags & NFT_BASE_CHAIN)) | |
3289 | return; | |
3290 | ||
3291 | basechain = nft_base_chain(trans->ctx.chain); | |
3292 | nft_chain_stats_replace(basechain, nft_trans_chain_stats(trans)); | |
3293 | ||
3294 | switch (nft_trans_chain_policy(trans)) { | |
3295 | case NF_DROP: | |
3296 | case NF_ACCEPT: | |
3297 | basechain->policy = nft_trans_chain_policy(trans); | |
3298 | break; | |
3299 | } | |
3300 | } | |
3301 | ||
c7c32e72 PNA |
3302 | /* Schedule objects for release via rcu to make sure no packets are accesing |
3303 | * removed rules. | |
3304 | */ | |
3305 | static void nf_tables_commit_release_rcu(struct rcu_head *rt) | |
3306 | { | |
3307 | struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head); | |
3308 | ||
3309 | switch (trans->msg_type) { | |
3310 | case NFT_MSG_DELTABLE: | |
3311 | nf_tables_table_destroy(&trans->ctx); | |
3312 | break; | |
3313 | case NFT_MSG_DELCHAIN: | |
3314 | nf_tables_chain_destroy(trans->ctx.chain); | |
3315 | break; | |
3316 | case NFT_MSG_DELRULE: | |
3317 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3318 | break; | |
3319 | case NFT_MSG_DELSET: | |
3320 | nft_set_destroy(nft_trans_set(trans)); | |
3321 | break; | |
3322 | } | |
3323 | kfree(trans); | |
3324 | } | |
3325 | ||
37082f93 PNA |
3326 | static int nf_tables_commit(struct sk_buff *skb) |
3327 | { | |
3328 | struct net *net = sock_net(skb->sk); | |
3329 | struct nft_trans *trans, *next; | |
60319eb1 | 3330 | struct nft_set *set; |
37082f93 PNA |
3331 | |
3332 | /* Bump generation counter, invalidate any dump in progress */ | |
3333 | net->nft.genctr++; | |
3334 | ||
3335 | /* A new generation has just started */ | |
3336 | net->nft.gencursor = gencursor_next(net); | |
3337 | ||
3338 | /* Make sure all packets have left the previous generation before | |
3339 | * purging old rules. | |
3340 | */ | |
3341 | synchronize_rcu(); | |
3342 | ||
3343 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3344 | switch (trans->msg_type) { |
55dd6f93 PNA |
3345 | case NFT_MSG_NEWTABLE: |
3346 | if (nft_trans_table_update(trans)) { | |
3347 | if (!nft_trans_table_enable(trans)) { | |
3348 | nf_tables_table_disable(trans->ctx.afi, | |
3349 | trans->ctx.table); | |
3350 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3351 | } | |
3352 | } else { | |
3353 | trans->ctx.table->flags &= ~NFT_TABLE_INACTIVE; | |
3354 | } | |
35151d84 | 3355 | nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); |
55dd6f93 PNA |
3356 | nft_trans_destroy(trans); |
3357 | break; | |
3358 | case NFT_MSG_DELTABLE: | |
35151d84 | 3359 | nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); |
55dd6f93 | 3360 | break; |
91c7b38d PNA |
3361 | case NFT_MSG_NEWCHAIN: |
3362 | if (nft_trans_chain_update(trans)) | |
3363 | nft_chain_commit_update(trans); | |
3364 | else { | |
3365 | trans->ctx.chain->flags &= ~NFT_CHAIN_INACTIVE; | |
3366 | trans->ctx.table->use++; | |
3367 | } | |
35151d84 | 3368 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); |
91c7b38d PNA |
3369 | nft_trans_destroy(trans); |
3370 | break; | |
3371 | case NFT_MSG_DELCHAIN: | |
3372 | trans->ctx.table->use--; | |
35151d84 | 3373 | nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); |
91c7b38d PNA |
3374 | if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) && |
3375 | trans->ctx.chain->flags & NFT_BASE_CHAIN) { | |
3376 | nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops, | |
3377 | trans->ctx.afi->nops); | |
3378 | } | |
3379 | break; | |
b380e5c7 PNA |
3380 | case NFT_MSG_NEWRULE: |
3381 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); | |
35151d84 | 3382 | nf_tables_rule_notify(&trans->ctx, |
37082f93 | 3383 | nft_trans_rule(trans), |
35151d84 | 3384 | NFT_MSG_NEWRULE); |
37082f93 | 3385 | nft_trans_destroy(trans); |
b380e5c7 PNA |
3386 | break; |
3387 | case NFT_MSG_DELRULE: | |
3388 | list_del_rcu(&nft_trans_rule(trans)->list); | |
35151d84 PNA |
3389 | nf_tables_rule_notify(&trans->ctx, |
3390 | nft_trans_rule(trans), | |
3391 | NFT_MSG_DELRULE); | |
b380e5c7 | 3392 | break; |
958bee14 PNA |
3393 | case NFT_MSG_NEWSET: |
3394 | nft_trans_set(trans)->flags &= ~NFT_SET_INACTIVE; | |
3395 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), | |
3396 | NFT_MSG_NEWSET); | |
3397 | nft_trans_destroy(trans); | |
3398 | break; | |
3399 | case NFT_MSG_DELSET: | |
3400 | nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), | |
3401 | NFT_MSG_DELSET); | |
3402 | break; | |
60319eb1 PNA |
3403 | case NFT_MSG_NEWSETELEM: |
3404 | nft_trans_elem_set(trans)->nelems++; | |
3405 | nf_tables_setelem_notify(&trans->ctx, | |
3406 | nft_trans_elem_set(trans), | |
3407 | &nft_trans_elem(trans), | |
3408 | NFT_MSG_NEWSETELEM, 0); | |
3409 | nft_trans_destroy(trans); | |
3410 | break; | |
3411 | case NFT_MSG_DELSETELEM: | |
3412 | nft_trans_elem_set(trans)->nelems--; | |
3413 | nf_tables_setelem_notify(&trans->ctx, | |
3414 | nft_trans_elem_set(trans), | |
3415 | &nft_trans_elem(trans), | |
3416 | NFT_MSG_DELSETELEM, 0); | |
3417 | set = nft_trans_elem_set(trans); | |
3418 | set->ops->get(set, &nft_trans_elem(trans)); | |
3419 | set->ops->remove(set, &nft_trans_elem(trans)); | |
3420 | nft_trans_destroy(trans); | |
3421 | break; | |
37082f93 | 3422 | } |
37082f93 PNA |
3423 | } |
3424 | ||
37082f93 | 3425 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 PNA |
3426 | list_del(&trans->list); |
3427 | trans->ctx.nla = NULL; | |
3428 | call_rcu(&trans->rcu_head, nf_tables_commit_release_rcu); | |
37082f93 PNA |
3429 | } |
3430 | ||
3431 | return 0; | |
3432 | } | |
3433 | ||
c7c32e72 PNA |
3434 | /* Schedule objects for release via rcu to make sure no packets are accesing |
3435 | * aborted rules. | |
3436 | */ | |
3437 | static void nf_tables_abort_release_rcu(struct rcu_head *rt) | |
3438 | { | |
3439 | struct nft_trans *trans = container_of(rt, struct nft_trans, rcu_head); | |
3440 | ||
3441 | switch (trans->msg_type) { | |
3442 | case NFT_MSG_NEWTABLE: | |
3443 | nf_tables_table_destroy(&trans->ctx); | |
3444 | break; | |
3445 | case NFT_MSG_NEWCHAIN: | |
3446 | nf_tables_chain_destroy(trans->ctx.chain); | |
3447 | break; | |
3448 | case NFT_MSG_NEWRULE: | |
3449 | nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); | |
3450 | break; | |
3451 | case NFT_MSG_NEWSET: | |
3452 | nft_set_destroy(nft_trans_set(trans)); | |
3453 | break; | |
3454 | } | |
3455 | kfree(trans); | |
3456 | } | |
3457 | ||
37082f93 PNA |
3458 | static int nf_tables_abort(struct sk_buff *skb) |
3459 | { | |
3460 | struct net *net = sock_net(skb->sk); | |
3461 | struct nft_trans *trans, *next; | |
60319eb1 | 3462 | struct nft_set *set; |
37082f93 PNA |
3463 | |
3464 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { | |
b380e5c7 | 3465 | switch (trans->msg_type) { |
55dd6f93 PNA |
3466 | case NFT_MSG_NEWTABLE: |
3467 | if (nft_trans_table_update(trans)) { | |
3468 | if (nft_trans_table_enable(trans)) { | |
3469 | nf_tables_table_disable(trans->ctx.afi, | |
3470 | trans->ctx.table); | |
3471 | trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; | |
3472 | } | |
3473 | nft_trans_destroy(trans); | |
3474 | } else { | |
3475 | list_del(&trans->ctx.table->list); | |
3476 | } | |
3477 | break; | |
3478 | case NFT_MSG_DELTABLE: | |
3479 | list_add_tail(&trans->ctx.table->list, | |
3480 | &trans->ctx.afi->tables); | |
3481 | nft_trans_destroy(trans); | |
3482 | break; | |
91c7b38d PNA |
3483 | case NFT_MSG_NEWCHAIN: |
3484 | if (nft_trans_chain_update(trans)) { | |
3485 | if (nft_trans_chain_stats(trans)) | |
3486 | free_percpu(nft_trans_chain_stats(trans)); | |
3487 | ||
3488 | nft_trans_destroy(trans); | |
3489 | } else { | |
3490 | list_del(&trans->ctx.chain->list); | |
3491 | if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT) && | |
3492 | trans->ctx.chain->flags & NFT_BASE_CHAIN) { | |
3493 | nf_unregister_hooks(nft_base_chain(trans->ctx.chain)->ops, | |
3494 | trans->ctx.afi->nops); | |
3495 | } | |
3496 | } | |
3497 | break; | |
3498 | case NFT_MSG_DELCHAIN: | |
3499 | list_add_tail(&trans->ctx.chain->list, | |
3500 | &trans->ctx.table->chains); | |
3501 | nft_trans_destroy(trans); | |
3502 | break; | |
b380e5c7 PNA |
3503 | case NFT_MSG_NEWRULE: |
3504 | list_del_rcu(&nft_trans_rule(trans)->list); | |
3505 | break; | |
3506 | case NFT_MSG_DELRULE: | |
3507 | nft_rule_clear(trans->ctx.net, nft_trans_rule(trans)); | |
37082f93 | 3508 | nft_trans_destroy(trans); |
b380e5c7 | 3509 | break; |
958bee14 PNA |
3510 | case NFT_MSG_NEWSET: |
3511 | list_del(&nft_trans_set(trans)->list); | |
3512 | break; | |
3513 | case NFT_MSG_DELSET: | |
3514 | list_add_tail(&nft_trans_set(trans)->list, | |
3515 | &trans->ctx.table->sets); | |
3516 | nft_trans_destroy(trans); | |
3517 | break; | |
60319eb1 PNA |
3518 | case NFT_MSG_NEWSETELEM: |
3519 | set = nft_trans_elem_set(trans); | |
3520 | set->ops->get(set, &nft_trans_elem(trans)); | |
3521 | set->ops->remove(set, &nft_trans_elem(trans)); | |
3522 | nft_trans_destroy(trans); | |
3523 | break; | |
3524 | case NFT_MSG_DELSETELEM: | |
3525 | nft_trans_destroy(trans); | |
3526 | break; | |
37082f93 | 3527 | } |
37082f93 PNA |
3528 | } |
3529 | ||
37082f93 | 3530 | list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) { |
c7c32e72 PNA |
3531 | list_del(&trans->list); |
3532 | trans->ctx.nla = NULL; | |
3533 | call_rcu(&trans->rcu_head, nf_tables_abort_release_rcu); | |
37082f93 PNA |
3534 | } |
3535 | ||
3536 | return 0; | |
3537 | } | |
3538 | ||
96518518 PM |
3539 | static const struct nfnetlink_subsystem nf_tables_subsys = { |
3540 | .name = "nf_tables", | |
3541 | .subsys_id = NFNL_SUBSYS_NFTABLES, | |
3542 | .cb_count = NFT_MSG_MAX, | |
3543 | .cb = nf_tables_cb, | |
0628b123 PNA |
3544 | .commit = nf_tables_commit, |
3545 | .abort = nf_tables_abort, | |
96518518 PM |
3546 | }; |
3547 | ||
20a69341 PM |
3548 | /* |
3549 | * Loop detection - walk through the ruleset beginning at the destination chain | |
3550 | * of a new jump until either the source chain is reached (loop) or all | |
3551 | * reachable chains have been traversed. | |
3552 | * | |
3553 | * The loop check is performed whenever a new jump verdict is added to an | |
3554 | * expression or verdict map or a verdict map is bound to a new chain. | |
3555 | */ | |
3556 | ||
3557 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
3558 | const struct nft_chain *chain); | |
3559 | ||
3560 | static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, | |
3561 | const struct nft_set *set, | |
3562 | const struct nft_set_iter *iter, | |
3563 | const struct nft_set_elem *elem) | |
3564 | { | |
62f9c8b4 PNA |
3565 | if (elem->flags & NFT_SET_ELEM_INTERVAL_END) |
3566 | return 0; | |
3567 | ||
20a69341 PM |
3568 | switch (elem->data.verdict) { |
3569 | case NFT_JUMP: | |
3570 | case NFT_GOTO: | |
3571 | return nf_tables_check_loops(ctx, elem->data.chain); | |
3572 | default: | |
3573 | return 0; | |
3574 | } | |
3575 | } | |
3576 | ||
3577 | static int nf_tables_check_loops(const struct nft_ctx *ctx, | |
3578 | const struct nft_chain *chain) | |
3579 | { | |
3580 | const struct nft_rule *rule; | |
3581 | const struct nft_expr *expr, *last; | |
20a69341 PM |
3582 | const struct nft_set *set; |
3583 | struct nft_set_binding *binding; | |
3584 | struct nft_set_iter iter; | |
20a69341 PM |
3585 | |
3586 | if (ctx->chain == chain) | |
3587 | return -ELOOP; | |
3588 | ||
3589 | list_for_each_entry(rule, &chain->rules, list) { | |
3590 | nft_rule_for_each_expr(expr, last, rule) { | |
0ca743a5 PNA |
3591 | const struct nft_data *data = NULL; |
3592 | int err; | |
3593 | ||
3594 | if (!expr->ops->validate) | |
20a69341 PM |
3595 | continue; |
3596 | ||
0ca743a5 PNA |
3597 | err = expr->ops->validate(ctx, expr, &data); |
3598 | if (err < 0) | |
3599 | return err; | |
3600 | ||
20a69341 | 3601 | if (data == NULL) |
0ca743a5 | 3602 | continue; |
20a69341 PM |
3603 | |
3604 | switch (data->verdict) { | |
3605 | case NFT_JUMP: | |
3606 | case NFT_GOTO: | |
3607 | err = nf_tables_check_loops(ctx, data->chain); | |
3608 | if (err < 0) | |
3609 | return err; | |
3610 | default: | |
3611 | break; | |
3612 | } | |
3613 | } | |
3614 | } | |
3615 | ||
3616 | list_for_each_entry(set, &ctx->table->sets, list) { | |
3617 | if (!(set->flags & NFT_SET_MAP) || | |
3618 | set->dtype != NFT_DATA_VERDICT) | |
3619 | continue; | |
3620 | ||
3621 | list_for_each_entry(binding, &set->bindings, list) { | |
3622 | if (binding->chain != chain) | |
3623 | continue; | |
3624 | ||
3625 | iter.skip = 0; | |
3626 | iter.count = 0; | |
3627 | iter.err = 0; | |
3628 | iter.fn = nf_tables_loop_check_setelem; | |
3629 | ||
3630 | set->ops->walk(ctx, set, &iter); | |
3631 | if (iter.err < 0) | |
3632 | return iter.err; | |
3633 | } | |
3634 | } | |
3635 | ||
3636 | return 0; | |
3637 | } | |
3638 | ||
96518518 PM |
3639 | /** |
3640 | * nft_validate_input_register - validate an expressions' input register | |
3641 | * | |
3642 | * @reg: the register number | |
3643 | * | |
3644 | * Validate that the input register is one of the general purpose | |
3645 | * registers. | |
3646 | */ | |
3647 | int nft_validate_input_register(enum nft_registers reg) | |
3648 | { | |
3649 | if (reg <= NFT_REG_VERDICT) | |
3650 | return -EINVAL; | |
3651 | if (reg > NFT_REG_MAX) | |
3652 | return -ERANGE; | |
3653 | return 0; | |
3654 | } | |
3655 | EXPORT_SYMBOL_GPL(nft_validate_input_register); | |
3656 | ||
3657 | /** | |
3658 | * nft_validate_output_register - validate an expressions' output register | |
3659 | * | |
3660 | * @reg: the register number | |
3661 | * | |
3662 | * Validate that the output register is one of the general purpose | |
3663 | * registers or the verdict register. | |
3664 | */ | |
3665 | int nft_validate_output_register(enum nft_registers reg) | |
3666 | { | |
3667 | if (reg < NFT_REG_VERDICT) | |
3668 | return -EINVAL; | |
3669 | if (reg > NFT_REG_MAX) | |
3670 | return -ERANGE; | |
3671 | return 0; | |
3672 | } | |
3673 | EXPORT_SYMBOL_GPL(nft_validate_output_register); | |
3674 | ||
3675 | /** | |
3676 | * nft_validate_data_load - validate an expressions' data load | |
3677 | * | |
3678 | * @ctx: context of the expression performing the load | |
3679 | * @reg: the destination register number | |
3680 | * @data: the data to load | |
3681 | * @type: the data type | |
3682 | * | |
3683 | * Validate that a data load uses the appropriate data type for | |
3684 | * the destination register. A value of NULL for the data means | |
3685 | * that its runtime gathered data, which is always of type | |
3686 | * NFT_DATA_VALUE. | |
3687 | */ | |
3688 | int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg, | |
3689 | const struct nft_data *data, | |
3690 | enum nft_data_types type) | |
3691 | { | |
20a69341 PM |
3692 | int err; |
3693 | ||
96518518 PM |
3694 | switch (reg) { |
3695 | case NFT_REG_VERDICT: | |
3696 | if (data == NULL || type != NFT_DATA_VERDICT) | |
3697 | return -EINVAL; | |
20a69341 PM |
3698 | |
3699 | if (data->verdict == NFT_GOTO || data->verdict == NFT_JUMP) { | |
3700 | err = nf_tables_check_loops(ctx, data->chain); | |
3701 | if (err < 0) | |
3702 | return err; | |
3703 | ||
3704 | if (ctx->chain->level + 1 > data->chain->level) { | |
3705 | if (ctx->chain->level + 1 == NFT_JUMP_STACK_SIZE) | |
3706 | return -EMLINK; | |
3707 | data->chain->level = ctx->chain->level + 1; | |
3708 | } | |
3709 | } | |
3710 | ||
96518518 PM |
3711 | return 0; |
3712 | default: | |
3713 | if (data != NULL && type != NFT_DATA_VALUE) | |
3714 | return -EINVAL; | |
3715 | return 0; | |
3716 | } | |
3717 | } | |
3718 | EXPORT_SYMBOL_GPL(nft_validate_data_load); | |
3719 | ||
3720 | static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { | |
3721 | [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, | |
3722 | [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, | |
3723 | .len = NFT_CHAIN_MAXNAMELEN - 1 }, | |
3724 | }; | |
3725 | ||
3726 | static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3727 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3728 | { | |
3729 | struct nlattr *tb[NFTA_VERDICT_MAX + 1]; | |
3730 | struct nft_chain *chain; | |
3731 | int err; | |
3732 | ||
3733 | err = nla_parse_nested(tb, NFTA_VERDICT_MAX, nla, nft_verdict_policy); | |
3734 | if (err < 0) | |
3735 | return err; | |
3736 | ||
3737 | if (!tb[NFTA_VERDICT_CODE]) | |
3738 | return -EINVAL; | |
3739 | data->verdict = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); | |
3740 | ||
3741 | switch (data->verdict) { | |
e0abdadc PM |
3742 | default: |
3743 | switch (data->verdict & NF_VERDICT_MASK) { | |
3744 | case NF_ACCEPT: | |
3745 | case NF_DROP: | |
3746 | case NF_QUEUE: | |
3747 | break; | |
3748 | default: | |
3749 | return -EINVAL; | |
3750 | } | |
3751 | /* fall through */ | |
96518518 PM |
3752 | case NFT_CONTINUE: |
3753 | case NFT_BREAK: | |
3754 | case NFT_RETURN: | |
3755 | desc->len = sizeof(data->verdict); | |
3756 | break; | |
3757 | case NFT_JUMP: | |
3758 | case NFT_GOTO: | |
3759 | if (!tb[NFTA_VERDICT_CHAIN]) | |
3760 | return -EINVAL; | |
3761 | chain = nf_tables_chain_lookup(ctx->table, | |
3762 | tb[NFTA_VERDICT_CHAIN]); | |
3763 | if (IS_ERR(chain)) | |
3764 | return PTR_ERR(chain); | |
3765 | if (chain->flags & NFT_BASE_CHAIN) | |
3766 | return -EOPNOTSUPP; | |
3767 | ||
96518518 PM |
3768 | chain->use++; |
3769 | data->chain = chain; | |
3770 | desc->len = sizeof(data); | |
3771 | break; | |
96518518 PM |
3772 | } |
3773 | ||
3774 | desc->type = NFT_DATA_VERDICT; | |
3775 | return 0; | |
3776 | } | |
3777 | ||
3778 | static void nft_verdict_uninit(const struct nft_data *data) | |
3779 | { | |
3780 | switch (data->verdict) { | |
3781 | case NFT_JUMP: | |
3782 | case NFT_GOTO: | |
3783 | data->chain->use--; | |
3784 | break; | |
3785 | } | |
3786 | } | |
3787 | ||
3788 | static int nft_verdict_dump(struct sk_buff *skb, const struct nft_data *data) | |
3789 | { | |
3790 | struct nlattr *nest; | |
3791 | ||
3792 | nest = nla_nest_start(skb, NFTA_DATA_VERDICT); | |
3793 | if (!nest) | |
3794 | goto nla_put_failure; | |
3795 | ||
3796 | if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(data->verdict))) | |
3797 | goto nla_put_failure; | |
3798 | ||
3799 | switch (data->verdict) { | |
3800 | case NFT_JUMP: | |
3801 | case NFT_GOTO: | |
3802 | if (nla_put_string(skb, NFTA_VERDICT_CHAIN, data->chain->name)) | |
3803 | goto nla_put_failure; | |
3804 | } | |
3805 | nla_nest_end(skb, nest); | |
3806 | return 0; | |
3807 | ||
3808 | nla_put_failure: | |
3809 | return -1; | |
3810 | } | |
3811 | ||
3812 | static int nft_value_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3813 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3814 | { | |
3815 | unsigned int len; | |
3816 | ||
3817 | len = nla_len(nla); | |
3818 | if (len == 0) | |
3819 | return -EINVAL; | |
3820 | if (len > sizeof(data->data)) | |
3821 | return -EOVERFLOW; | |
3822 | ||
3823 | nla_memcpy(data->data, nla, sizeof(data->data)); | |
3824 | desc->type = NFT_DATA_VALUE; | |
3825 | desc->len = len; | |
3826 | return 0; | |
3827 | } | |
3828 | ||
3829 | static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, | |
3830 | unsigned int len) | |
3831 | { | |
3832 | return nla_put(skb, NFTA_DATA_VALUE, len, data->data); | |
3833 | } | |
3834 | ||
3835 | static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { | |
3836 | [NFTA_DATA_VALUE] = { .type = NLA_BINARY, | |
3837 | .len = FIELD_SIZEOF(struct nft_data, data) }, | |
3838 | [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, | |
3839 | }; | |
3840 | ||
3841 | /** | |
3842 | * nft_data_init - parse nf_tables data netlink attributes | |
3843 | * | |
3844 | * @ctx: context of the expression using the data | |
3845 | * @data: destination struct nft_data | |
3846 | * @desc: data description | |
3847 | * @nla: netlink attribute containing data | |
3848 | * | |
3849 | * Parse the netlink data attributes and initialize a struct nft_data. | |
3850 | * The type and length of data are returned in the data description. | |
3851 | * | |
3852 | * The caller can indicate that it only wants to accept data of type | |
3853 | * NFT_DATA_VALUE by passing NULL for the ctx argument. | |
3854 | */ | |
3855 | int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, | |
3856 | struct nft_data_desc *desc, const struct nlattr *nla) | |
3857 | { | |
3858 | struct nlattr *tb[NFTA_DATA_MAX + 1]; | |
3859 | int err; | |
3860 | ||
3861 | err = nla_parse_nested(tb, NFTA_DATA_MAX, nla, nft_data_policy); | |
3862 | if (err < 0) | |
3863 | return err; | |
3864 | ||
3865 | if (tb[NFTA_DATA_VALUE]) | |
3866 | return nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); | |
3867 | if (tb[NFTA_DATA_VERDICT] && ctx != NULL) | |
3868 | return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); | |
3869 | return -EINVAL; | |
3870 | } | |
3871 | EXPORT_SYMBOL_GPL(nft_data_init); | |
3872 | ||
3873 | /** | |
3874 | * nft_data_uninit - release a nft_data item | |
3875 | * | |
3876 | * @data: struct nft_data to release | |
3877 | * @type: type of data | |
3878 | * | |
3879 | * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, | |
3880 | * all others need to be released by calling this function. | |
3881 | */ | |
3882 | void nft_data_uninit(const struct nft_data *data, enum nft_data_types type) | |
3883 | { | |
3884 | switch (type) { | |
3885 | case NFT_DATA_VALUE: | |
3886 | return; | |
3887 | case NFT_DATA_VERDICT: | |
3888 | return nft_verdict_uninit(data); | |
3889 | default: | |
3890 | WARN_ON(1); | |
3891 | } | |
3892 | } | |
3893 | EXPORT_SYMBOL_GPL(nft_data_uninit); | |
3894 | ||
3895 | int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, | |
3896 | enum nft_data_types type, unsigned int len) | |
3897 | { | |
3898 | struct nlattr *nest; | |
3899 | int err; | |
3900 | ||
3901 | nest = nla_nest_start(skb, attr); | |
3902 | if (nest == NULL) | |
3903 | return -1; | |
3904 | ||
3905 | switch (type) { | |
3906 | case NFT_DATA_VALUE: | |
3907 | err = nft_value_dump(skb, data, len); | |
3908 | break; | |
3909 | case NFT_DATA_VERDICT: | |
3910 | err = nft_verdict_dump(skb, data); | |
3911 | break; | |
3912 | default: | |
3913 | err = -EINVAL; | |
3914 | WARN_ON(1); | |
3915 | } | |
3916 | ||
3917 | nla_nest_end(skb, nest); | |
3918 | return err; | |
3919 | } | |
3920 | EXPORT_SYMBOL_GPL(nft_data_dump); | |
3921 | ||
99633ab2 PNA |
3922 | static int nf_tables_init_net(struct net *net) |
3923 | { | |
3924 | INIT_LIST_HEAD(&net->nft.af_info); | |
0628b123 | 3925 | INIT_LIST_HEAD(&net->nft.commit_list); |
99633ab2 PNA |
3926 | return 0; |
3927 | } | |
3928 | ||
3929 | static struct pernet_operations nf_tables_net_ops = { | |
3930 | .init = nf_tables_init_net, | |
3931 | }; | |
3932 | ||
96518518 PM |
3933 | static int __init nf_tables_module_init(void) |
3934 | { | |
3935 | int err; | |
3936 | ||
3937 | info = kmalloc(sizeof(struct nft_expr_info) * NFT_RULE_MAXEXPRS, | |
3938 | GFP_KERNEL); | |
3939 | if (info == NULL) { | |
3940 | err = -ENOMEM; | |
3941 | goto err1; | |
3942 | } | |
3943 | ||
3944 | err = nf_tables_core_module_init(); | |
3945 | if (err < 0) | |
3946 | goto err2; | |
3947 | ||
3948 | err = nfnetlink_subsys_register(&nf_tables_subsys); | |
3949 | if (err < 0) | |
3950 | goto err3; | |
3951 | ||
3952 | pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n"); | |
99633ab2 | 3953 | return register_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3954 | err3: |
3955 | nf_tables_core_module_exit(); | |
3956 | err2: | |
3957 | kfree(info); | |
3958 | err1: | |
3959 | return err; | |
3960 | } | |
3961 | ||
3962 | static void __exit nf_tables_module_exit(void) | |
3963 | { | |
99633ab2 | 3964 | unregister_pernet_subsys(&nf_tables_net_ops); |
96518518 PM |
3965 | nfnetlink_subsys_unregister(&nf_tables_subsys); |
3966 | nf_tables_core_module_exit(); | |
3967 | kfree(info); | |
3968 | } | |
3969 | ||
3970 | module_init(nf_tables_module_init); | |
3971 | module_exit(nf_tables_module_exit); | |
3972 | ||
3973 | MODULE_LICENSE("GPL"); | |
3974 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
3975 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); |