Commit | Line | Data |
---|---|---|
0ca743a5 PNA |
1 | /* |
2 | * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org> | |
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 | * This software has been sponsored by Sophos Astaro <http://www.sophos.com> | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/netlink.h> | |
15 | #include <linux/netfilter.h> | |
16 | #include <linux/netfilter/nfnetlink.h> | |
17 | #include <linux/netfilter/nf_tables.h> | |
18 | #include <linux/netfilter/nf_tables_compat.h> | |
19 | #include <linux/netfilter/x_tables.h> | |
20 | #include <linux/netfilter_ipv4/ip_tables.h> | |
21 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
5191f4d8 | 22 | #include <linux/netfilter_bridge/ebtables.h> |
5f158939 | 23 | #include <linux/netfilter_arp/arp_tables.h> |
0ca743a5 PNA |
24 | #include <net/netfilter/nf_tables.h> |
25 | ||
f3f5dded PNA |
26 | static int nft_compat_chain_validate_dependency(const char *tablename, |
27 | const struct nft_chain *chain) | |
28 | { | |
f3f5dded PNA |
29 | const struct nft_base_chain *basechain; |
30 | ||
31 | if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) | |
32 | return 0; | |
33 | ||
f3f5dded | 34 | basechain = nft_base_chain(chain); |
c918687f PNA |
35 | if (strcmp(tablename, "nat") == 0 && |
36 | basechain->type->type != NFT_CHAIN_T_NAT) | |
f3f5dded PNA |
37 | return -EINVAL; |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
0ca743a5 PNA |
42 | union nft_entry { |
43 | struct ipt_entry e4; | |
44 | struct ip6t_entry e6; | |
5191f4d8 | 45 | struct ebt_entry ebt; |
5f158939 | 46 | struct arpt_entry arp; |
0ca743a5 PNA |
47 | }; |
48 | ||
49 | static inline void | |
50 | nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) | |
51 | { | |
52 | par->target = xt; | |
53 | par->targinfo = xt_info; | |
54 | par->hotdrop = false; | |
55 | } | |
56 | ||
5191f4d8 | 57 | static void nft_target_eval_xt(const struct nft_expr *expr, |
a55e22e9 | 58 | struct nft_regs *regs, |
5191f4d8 | 59 | const struct nft_pktinfo *pkt) |
0ca743a5 PNA |
60 | { |
61 | void *info = nft_expr_priv(expr); | |
62 | struct xt_target *target = expr->ops->data; | |
63 | struct sk_buff *skb = pkt->skb; | |
64 | int ret; | |
65 | ||
66 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
67 | ||
68 | ret = target->target(skb, &pkt->xt); | |
69 | ||
70 | if (pkt->xt.hotdrop) | |
71 | ret = NF_DROP; | |
72 | ||
5191f4d8 | 73 | switch (ret) { |
0ca743a5 | 74 | case XT_CONTINUE: |
a55e22e9 | 75 | regs->verdict.code = NFT_CONTINUE; |
0ca743a5 PNA |
76 | break; |
77 | default: | |
a55e22e9 | 78 | regs->verdict.code = ret; |
0ca743a5 PNA |
79 | break; |
80 | } | |
5191f4d8 AB |
81 | } |
82 | ||
83 | static void nft_target_eval_bridge(const struct nft_expr *expr, | |
a55e22e9 | 84 | struct nft_regs *regs, |
5191f4d8 AB |
85 | const struct nft_pktinfo *pkt) |
86 | { | |
87 | void *info = nft_expr_priv(expr); | |
88 | struct xt_target *target = expr->ops->data; | |
89 | struct sk_buff *skb = pkt->skb; | |
90 | int ret; | |
91 | ||
92 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
93 | ||
94 | ret = target->target(skb, &pkt->xt); | |
95 | ||
96 | if (pkt->xt.hotdrop) | |
97 | ret = NF_DROP; | |
98 | ||
99 | switch (ret) { | |
100 | case EBT_ACCEPT: | |
a55e22e9 | 101 | regs->verdict.code = NF_ACCEPT; |
5191f4d8 AB |
102 | break; |
103 | case EBT_DROP: | |
a55e22e9 | 104 | regs->verdict.code = NF_DROP; |
5191f4d8 AB |
105 | break; |
106 | case EBT_CONTINUE: | |
a55e22e9 | 107 | regs->verdict.code = NFT_CONTINUE; |
5191f4d8 AB |
108 | break; |
109 | case EBT_RETURN: | |
a55e22e9 | 110 | regs->verdict.code = NFT_RETURN; |
5191f4d8 AB |
111 | break; |
112 | default: | |
a55e22e9 | 113 | regs->verdict.code = ret; |
5191f4d8 AB |
114 | break; |
115 | } | |
0ca743a5 PNA |
116 | } |
117 | ||
118 | static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { | |
119 | [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, | |
120 | [NFTA_TARGET_REV] = { .type = NLA_U32 }, | |
121 | [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, | |
122 | }; | |
123 | ||
124 | static void | |
125 | nft_target_set_tgchk_param(struct xt_tgchk_param *par, | |
126 | const struct nft_ctx *ctx, | |
127 | struct xt_target *target, void *info, | |
2156d321 | 128 | union nft_entry *entry, u16 proto, bool inv) |
0ca743a5 | 129 | { |
2daf1b4d | 130 | par->net = ctx->net; |
0ca743a5 PNA |
131 | par->table = ctx->table->name; |
132 | switch (ctx->afi->family) { | |
133 | case AF_INET: | |
134 | entry->e4.ip.proto = proto; | |
135 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
136 | break; | |
137 | case AF_INET6: | |
749177cc PNA |
138 | if (proto) |
139 | entry->e6.ipv6.flags |= IP6T_F_PROTO; | |
140 | ||
0ca743a5 PNA |
141 | entry->e6.ipv6.proto = proto; |
142 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
143 | break; | |
5191f4d8 | 144 | case NFPROTO_BRIDGE: |
2156d321 | 145 | entry->ebt.ethproto = (__force __be16)proto; |
5191f4d8 AB |
146 | entry->ebt.invflags = inv ? EBT_IPROTO : 0; |
147 | break; | |
5f158939 AB |
148 | case NFPROTO_ARP: |
149 | break; | |
0ca743a5 PNA |
150 | } |
151 | par->entryinfo = entry; | |
152 | par->target = target; | |
153 | par->targinfo = info; | |
154 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
155 | const struct nft_base_chain *basechain = | |
156 | nft_base_chain(ctx->chain); | |
115a60b1 | 157 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
158 | |
159 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
160 | } else { |
161 | par->hook_mask = 0; | |
0ca743a5 PNA |
162 | } |
163 | par->family = ctx->afi->family; | |
55917a21 | 164 | par->nft_compat = true; |
0ca743a5 PNA |
165 | } |
166 | ||
167 | static void target_compat_from_user(struct xt_target *t, void *in, void *out) | |
168 | { | |
756c1b1a | 169 | int pad; |
0ca743a5 | 170 | |
756c1b1a PNA |
171 | memcpy(out, in, t->targetsize); |
172 | pad = XT_ALIGN(t->targetsize) - t->targetsize; | |
173 | if (pad > 0) | |
174 | memset(out + t->targetsize, 0, pad); | |
0ca743a5 PNA |
175 | } |
176 | ||
177 | static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { | |
178 | [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, | |
179 | [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, | |
180 | }; | |
181 | ||
2156d321 | 182 | static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv) |
0ca743a5 PNA |
183 | { |
184 | struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; | |
185 | u32 flags; | |
186 | int err; | |
187 | ||
188 | err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, | |
189 | nft_rule_compat_policy); | |
190 | if (err < 0) | |
191 | return err; | |
192 | ||
193 | if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) | |
194 | return -EINVAL; | |
195 | ||
196 | flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); | |
197 | if (flags & ~NFT_RULE_COMPAT_F_MASK) | |
198 | return -EINVAL; | |
199 | if (flags & NFT_RULE_COMPAT_F_INV) | |
200 | *inv = true; | |
201 | ||
8691a9a3 PNA |
202 | *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); |
203 | return 0; | |
0ca743a5 PNA |
204 | } |
205 | ||
206 | static int | |
207 | nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
208 | const struct nlattr * const tb[]) | |
209 | { | |
210 | void *info = nft_expr_priv(expr); | |
211 | struct xt_target *target = expr->ops->data; | |
212 | struct xt_tgchk_param par; | |
213 | size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); | |
2156d321 | 214 | u16 proto = 0; |
0ca743a5 PNA |
215 | bool inv = false; |
216 | union nft_entry e = {}; | |
217 | int ret; | |
218 | ||
f3f5dded PNA |
219 | ret = nft_compat_chain_validate_dependency(target->table, ctx->chain); |
220 | if (ret < 0) | |
221 | goto err; | |
222 | ||
0ca743a5 PNA |
223 | target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); |
224 | ||
8691a9a3 PNA |
225 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
226 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
227 | if (ret < 0) | |
228 | goto err; | |
229 | } | |
0ca743a5 PNA |
230 | |
231 | nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); | |
232 | ||
233 | ret = xt_check_target(&par, size, proto, inv); | |
234 | if (ret < 0) | |
235 | goto err; | |
236 | ||
237 | /* The standard target cannot be used */ | |
238 | if (target->target == NULL) { | |
239 | ret = -EINVAL; | |
240 | goto err; | |
241 | } | |
242 | ||
243 | return 0; | |
244 | err: | |
245 | module_put(target->me); | |
246 | return ret; | |
247 | } | |
248 | ||
249 | static void | |
62472bce | 250 | nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
251 | { |
252 | struct xt_target *target = expr->ops->data; | |
3d9b1421 PNA |
253 | void *info = nft_expr_priv(expr); |
254 | struct xt_tgdtor_param par; | |
255 | ||
256 | par.net = ctx->net; | |
257 | par.target = target; | |
258 | par.targinfo = info; | |
259 | par.family = ctx->afi->family; | |
260 | if (par.target->destroy != NULL) | |
261 | par.target->destroy(&par); | |
0ca743a5 PNA |
262 | |
263 | module_put(target->me); | |
264 | } | |
265 | ||
0ca743a5 PNA |
266 | static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) |
267 | { | |
268 | const struct xt_target *target = expr->ops->data; | |
269 | void *info = nft_expr_priv(expr); | |
270 | ||
271 | if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || | |
272 | nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || | |
756c1b1a | 273 | nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info)) |
0ca743a5 PNA |
274 | goto nla_put_failure; |
275 | ||
276 | return 0; | |
277 | ||
278 | nla_put_failure: | |
279 | return -1; | |
280 | } | |
281 | ||
282 | static int nft_target_validate(const struct nft_ctx *ctx, | |
283 | const struct nft_expr *expr, | |
284 | const struct nft_data **data) | |
285 | { | |
286 | struct xt_target *target = expr->ops->data; | |
287 | unsigned int hook_mask = 0; | |
f3f5dded | 288 | int ret; |
0ca743a5 PNA |
289 | |
290 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
291 | const struct nft_base_chain *basechain = | |
292 | nft_base_chain(ctx->chain); | |
115a60b1 | 293 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
294 | |
295 | hook_mask = 1 << ops->hooknum; | |
f3f5dded PNA |
296 | if (!(hook_mask & target->hooks)) |
297 | return -EINVAL; | |
0ca743a5 | 298 | |
f3f5dded PNA |
299 | ret = nft_compat_chain_validate_dependency(target->table, |
300 | ctx->chain); | |
301 | if (ret < 0) | |
302 | return ret; | |
0ca743a5 PNA |
303 | } |
304 | return 0; | |
305 | } | |
306 | ||
307 | static void nft_match_eval(const struct nft_expr *expr, | |
a55e22e9 | 308 | struct nft_regs *regs, |
0ca743a5 PNA |
309 | const struct nft_pktinfo *pkt) |
310 | { | |
311 | void *info = nft_expr_priv(expr); | |
312 | struct xt_match *match = expr->ops->data; | |
313 | struct sk_buff *skb = pkt->skb; | |
314 | bool ret; | |
315 | ||
316 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); | |
317 | ||
318 | ret = match->match(skb, (struct xt_action_param *)&pkt->xt); | |
319 | ||
320 | if (pkt->xt.hotdrop) { | |
a55e22e9 | 321 | regs->verdict.code = NF_DROP; |
0ca743a5 PNA |
322 | return; |
323 | } | |
324 | ||
c1f86676 DM |
325 | switch (ret ? 1 : 0) { |
326 | case 1: | |
a55e22e9 | 327 | regs->verdict.code = NFT_CONTINUE; |
0ca743a5 | 328 | break; |
c1f86676 | 329 | case 0: |
a55e22e9 | 330 | regs->verdict.code = NFT_BREAK; |
0ca743a5 PNA |
331 | break; |
332 | } | |
333 | } | |
334 | ||
335 | static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { | |
336 | [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, | |
337 | [NFTA_MATCH_REV] = { .type = NLA_U32 }, | |
338 | [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, | |
339 | }; | |
340 | ||
341 | /* struct xt_mtchk_param and xt_tgchk_param look very similar */ | |
342 | static void | |
343 | nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, | |
344 | struct xt_match *match, void *info, | |
2156d321 | 345 | union nft_entry *entry, u16 proto, bool inv) |
0ca743a5 | 346 | { |
2daf1b4d | 347 | par->net = ctx->net; |
0ca743a5 PNA |
348 | par->table = ctx->table->name; |
349 | switch (ctx->afi->family) { | |
350 | case AF_INET: | |
351 | entry->e4.ip.proto = proto; | |
352 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
353 | break; | |
354 | case AF_INET6: | |
749177cc PNA |
355 | if (proto) |
356 | entry->e6.ipv6.flags |= IP6T_F_PROTO; | |
357 | ||
0ca743a5 PNA |
358 | entry->e6.ipv6.proto = proto; |
359 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
360 | break; | |
5191f4d8 | 361 | case NFPROTO_BRIDGE: |
2156d321 | 362 | entry->ebt.ethproto = (__force __be16)proto; |
5191f4d8 AB |
363 | entry->ebt.invflags = inv ? EBT_IPROTO : 0; |
364 | break; | |
5f158939 AB |
365 | case NFPROTO_ARP: |
366 | break; | |
0ca743a5 PNA |
367 | } |
368 | par->entryinfo = entry; | |
369 | par->match = match; | |
370 | par->matchinfo = info; | |
371 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
372 | const struct nft_base_chain *basechain = | |
373 | nft_base_chain(ctx->chain); | |
115a60b1 | 374 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
375 | |
376 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
377 | } else { |
378 | par->hook_mask = 0; | |
0ca743a5 PNA |
379 | } |
380 | par->family = ctx->afi->family; | |
55917a21 | 381 | par->nft_compat = true; |
0ca743a5 PNA |
382 | } |
383 | ||
384 | static void match_compat_from_user(struct xt_match *m, void *in, void *out) | |
385 | { | |
756c1b1a PNA |
386 | int pad; |
387 | ||
388 | memcpy(out, in, m->matchsize); | |
389 | pad = XT_ALIGN(m->matchsize) - m->matchsize; | |
390 | if (pad > 0) | |
391 | memset(out + m->matchsize, 0, pad); | |
0ca743a5 PNA |
392 | } |
393 | ||
394 | static int | |
395 | nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
396 | const struct nlattr * const tb[]) | |
397 | { | |
398 | void *info = nft_expr_priv(expr); | |
399 | struct xt_match *match = expr->ops->data; | |
400 | struct xt_mtchk_param par; | |
401 | size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); | |
2156d321 | 402 | u16 proto = 0; |
0ca743a5 PNA |
403 | bool inv = false; |
404 | union nft_entry e = {}; | |
405 | int ret; | |
406 | ||
afefb6f9 | 407 | ret = nft_compat_chain_validate_dependency(match->table, ctx->chain); |
f3f5dded PNA |
408 | if (ret < 0) |
409 | goto err; | |
410 | ||
0ca743a5 PNA |
411 | match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); |
412 | ||
8691a9a3 PNA |
413 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
414 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
415 | if (ret < 0) | |
416 | goto err; | |
417 | } | |
0ca743a5 PNA |
418 | |
419 | nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); | |
420 | ||
421 | ret = xt_check_match(&par, size, proto, inv); | |
422 | if (ret < 0) | |
423 | goto err; | |
424 | ||
425 | return 0; | |
426 | err: | |
427 | module_put(match->me); | |
428 | return ret; | |
429 | } | |
430 | ||
431 | static void | |
62472bce | 432 | nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
433 | { |
434 | struct xt_match *match = expr->ops->data; | |
3d9b1421 PNA |
435 | void *info = nft_expr_priv(expr); |
436 | struct xt_mtdtor_param par; | |
437 | ||
438 | par.net = ctx->net; | |
439 | par.match = match; | |
440 | par.matchinfo = info; | |
441 | par.family = ctx->afi->family; | |
442 | if (par.match->destroy != NULL) | |
443 | par.match->destroy(&par); | |
0ca743a5 PNA |
444 | |
445 | module_put(match->me); | |
446 | } | |
447 | ||
0ca743a5 PNA |
448 | static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) |
449 | { | |
450 | void *info = nft_expr_priv(expr); | |
451 | struct xt_match *match = expr->ops->data; | |
452 | ||
453 | if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || | |
454 | nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || | |
756c1b1a | 455 | nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info)) |
0ca743a5 PNA |
456 | goto nla_put_failure; |
457 | ||
458 | return 0; | |
459 | ||
460 | nla_put_failure: | |
461 | return -1; | |
462 | } | |
463 | ||
464 | static int nft_match_validate(const struct nft_ctx *ctx, | |
465 | const struct nft_expr *expr, | |
466 | const struct nft_data **data) | |
467 | { | |
468 | struct xt_match *match = expr->ops->data; | |
469 | unsigned int hook_mask = 0; | |
f3f5dded | 470 | int ret; |
0ca743a5 PNA |
471 | |
472 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
473 | const struct nft_base_chain *basechain = | |
474 | nft_base_chain(ctx->chain); | |
115a60b1 | 475 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
476 | |
477 | hook_mask = 1 << ops->hooknum; | |
f3f5dded PNA |
478 | if (!(hook_mask & match->hooks)) |
479 | return -EINVAL; | |
0ca743a5 | 480 | |
afefb6f9 | 481 | ret = nft_compat_chain_validate_dependency(match->table, |
f3f5dded PNA |
482 | ctx->chain); |
483 | if (ret < 0) | |
484 | return ret; | |
0ca743a5 PNA |
485 | } |
486 | return 0; | |
487 | } | |
488 | ||
489 | static int | |
490 | nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, | |
491 | int event, u16 family, const char *name, | |
492 | int rev, int target) | |
493 | { | |
494 | struct nlmsghdr *nlh; | |
495 | struct nfgenmsg *nfmsg; | |
496 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
497 | ||
498 | event |= NFNL_SUBSYS_NFT_COMPAT << 8; | |
499 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); | |
500 | if (nlh == NULL) | |
501 | goto nlmsg_failure; | |
502 | ||
503 | nfmsg = nlmsg_data(nlh); | |
504 | nfmsg->nfgen_family = family; | |
505 | nfmsg->version = NFNETLINK_V0; | |
506 | nfmsg->res_id = 0; | |
507 | ||
508 | if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || | |
509 | nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || | |
510 | nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) | |
511 | goto nla_put_failure; | |
512 | ||
513 | nlmsg_end(skb, nlh); | |
514 | return skb->len; | |
515 | ||
516 | nlmsg_failure: | |
517 | nla_put_failure: | |
518 | nlmsg_cancel(skb, nlh); | |
519 | return -1; | |
520 | } | |
521 | ||
7b8002a1 PNA |
522 | static int nfnl_compat_get(struct net *net, struct sock *nfnl, |
523 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
524 | const struct nlattr * const tb[]) | |
0ca743a5 PNA |
525 | { |
526 | int ret = 0, target; | |
527 | struct nfgenmsg *nfmsg; | |
528 | const char *fmt; | |
529 | const char *name; | |
530 | u32 rev; | |
531 | struct sk_buff *skb2; | |
532 | ||
533 | if (tb[NFTA_COMPAT_NAME] == NULL || | |
534 | tb[NFTA_COMPAT_REV] == NULL || | |
535 | tb[NFTA_COMPAT_TYPE] == NULL) | |
536 | return -EINVAL; | |
537 | ||
538 | name = nla_data(tb[NFTA_COMPAT_NAME]); | |
539 | rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); | |
540 | target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); | |
541 | ||
542 | nfmsg = nlmsg_data(nlh); | |
543 | ||
544 | switch(nfmsg->nfgen_family) { | |
545 | case AF_INET: | |
546 | fmt = "ipt_%s"; | |
547 | break; | |
548 | case AF_INET6: | |
549 | fmt = "ip6t_%s"; | |
550 | break; | |
5191f4d8 AB |
551 | case NFPROTO_BRIDGE: |
552 | fmt = "ebt_%s"; | |
553 | break; | |
5f158939 AB |
554 | case NFPROTO_ARP: |
555 | fmt = "arpt_%s"; | |
556 | break; | |
0ca743a5 PNA |
557 | default: |
558 | pr_err("nft_compat: unsupported protocol %d\n", | |
559 | nfmsg->nfgen_family); | |
560 | return -EINVAL; | |
561 | } | |
562 | ||
563 | try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, | |
564 | rev, target, &ret), | |
565 | fmt, name); | |
566 | ||
567 | if (ret < 0) | |
568 | return ret; | |
569 | ||
570 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
571 | if (skb2 == NULL) | |
572 | return -ENOMEM; | |
573 | ||
574 | /* include the best revision for this extension in the message */ | |
575 | if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, | |
576 | nlh->nlmsg_seq, | |
577 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
578 | NFNL_MSG_COMPAT_GET, | |
579 | nfmsg->nfgen_family, | |
580 | name, ret, target) <= 0) { | |
581 | kfree_skb(skb2); | |
582 | return -ENOSPC; | |
583 | } | |
584 | ||
585 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, | |
586 | MSG_DONTWAIT); | |
587 | if (ret > 0) | |
588 | ret = 0; | |
589 | ||
590 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
591 | } | |
592 | ||
593 | static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { | |
594 | [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, | |
595 | .len = NFT_COMPAT_NAME_MAX-1 }, | |
596 | [NFTA_COMPAT_REV] = { .type = NLA_U32 }, | |
597 | [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, | |
598 | }; | |
599 | ||
600 | static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { | |
601 | [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, | |
602 | .attr_count = NFTA_COMPAT_MAX, | |
603 | .policy = nfnl_compat_policy_get }, | |
604 | }; | |
605 | ||
606 | static const struct nfnetlink_subsystem nfnl_compat_subsys = { | |
607 | .name = "nft-compat", | |
608 | .subsys_id = NFNL_SUBSYS_NFT_COMPAT, | |
609 | .cb_count = NFNL_MSG_COMPAT_MAX, | |
610 | .cb = nfnl_nft_compat_cb, | |
611 | }; | |
612 | ||
613 | static LIST_HEAD(nft_match_list); | |
614 | ||
615 | struct nft_xt { | |
616 | struct list_head head; | |
617 | struct nft_expr_ops ops; | |
618 | }; | |
619 | ||
620 | static struct nft_expr_type nft_match_type; | |
621 | ||
ba378ca9 PNA |
622 | static bool nft_match_cmp(const struct xt_match *match, |
623 | const char *name, u32 rev, u32 family) | |
624 | { | |
625 | return strcmp(match->name, name) == 0 && match->revision == rev && | |
626 | (match->family == NFPROTO_UNSPEC || match->family == family); | |
627 | } | |
628 | ||
0ca743a5 PNA |
629 | static const struct nft_expr_ops * |
630 | nft_match_select_ops(const struct nft_ctx *ctx, | |
631 | const struct nlattr * const tb[]) | |
632 | { | |
633 | struct nft_xt *nft_match; | |
634 | struct xt_match *match; | |
635 | char *mt_name; | |
ba378ca9 | 636 | u32 rev, family; |
0ca743a5 PNA |
637 | |
638 | if (tb[NFTA_MATCH_NAME] == NULL || | |
639 | tb[NFTA_MATCH_REV] == NULL || | |
640 | tb[NFTA_MATCH_INFO] == NULL) | |
641 | return ERR_PTR(-EINVAL); | |
642 | ||
643 | mt_name = nla_data(tb[NFTA_MATCH_NAME]); | |
644 | rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); | |
645 | family = ctx->afi->family; | |
646 | ||
647 | /* Re-use the existing match if it's already loaded. */ | |
648 | list_for_each_entry(nft_match, &nft_match_list, head) { | |
649 | struct xt_match *match = nft_match->ops.data; | |
650 | ||
ba378ca9 | 651 | if (nft_match_cmp(match, mt_name, rev, family)) { |
520aa741 PNA |
652 | if (!try_module_get(match->me)) |
653 | return ERR_PTR(-ENOENT); | |
654 | ||
0ca743a5 | 655 | return &nft_match->ops; |
520aa741 | 656 | } |
0ca743a5 PNA |
657 | } |
658 | ||
659 | match = xt_request_find_match(family, mt_name, rev); | |
660 | if (IS_ERR(match)) | |
661 | return ERR_PTR(-ENOENT); | |
662 | ||
f0716cd6 FW |
663 | if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) |
664 | return ERR_PTR(-EINVAL); | |
665 | ||
0ca743a5 PNA |
666 | /* This is the first time we use this match, allocate operations */ |
667 | nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
668 | if (nft_match == NULL) | |
669 | return ERR_PTR(-ENOMEM); | |
670 | ||
671 | nft_match->ops.type = &nft_match_type; | |
756c1b1a | 672 | nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); |
0ca743a5 PNA |
673 | nft_match->ops.eval = nft_match_eval; |
674 | nft_match->ops.init = nft_match_init; | |
675 | nft_match->ops.destroy = nft_match_destroy; | |
676 | nft_match->ops.dump = nft_match_dump; | |
677 | nft_match->ops.validate = nft_match_validate; | |
678 | nft_match->ops.data = match; | |
679 | ||
680 | list_add(&nft_match->head, &nft_match_list); | |
681 | ||
682 | return &nft_match->ops; | |
683 | } | |
684 | ||
685 | static void nft_match_release(void) | |
686 | { | |
c359c415 | 687 | struct nft_xt *nft_match, *tmp; |
0ca743a5 | 688 | |
c359c415 | 689 | list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) |
0ca743a5 PNA |
690 | kfree(nft_match); |
691 | } | |
692 | ||
693 | static struct nft_expr_type nft_match_type __read_mostly = { | |
694 | .name = "match", | |
695 | .select_ops = nft_match_select_ops, | |
696 | .policy = nft_match_policy, | |
697 | .maxattr = NFTA_MATCH_MAX, | |
698 | .owner = THIS_MODULE, | |
699 | }; | |
700 | ||
701 | static LIST_HEAD(nft_target_list); | |
702 | ||
703 | static struct nft_expr_type nft_target_type; | |
704 | ||
ba378ca9 PNA |
705 | static bool nft_target_cmp(const struct xt_target *tg, |
706 | const char *name, u32 rev, u32 family) | |
707 | { | |
708 | return strcmp(tg->name, name) == 0 && tg->revision == rev && | |
709 | (tg->family == NFPROTO_UNSPEC || tg->family == family); | |
710 | } | |
711 | ||
0ca743a5 PNA |
712 | static const struct nft_expr_ops * |
713 | nft_target_select_ops(const struct nft_ctx *ctx, | |
714 | const struct nlattr * const tb[]) | |
715 | { | |
716 | struct nft_xt *nft_target; | |
717 | struct xt_target *target; | |
718 | char *tg_name; | |
ba378ca9 | 719 | u32 rev, family; |
0ca743a5 PNA |
720 | |
721 | if (tb[NFTA_TARGET_NAME] == NULL || | |
722 | tb[NFTA_TARGET_REV] == NULL || | |
723 | tb[NFTA_TARGET_INFO] == NULL) | |
724 | return ERR_PTR(-EINVAL); | |
725 | ||
726 | tg_name = nla_data(tb[NFTA_TARGET_NAME]); | |
727 | rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); | |
728 | family = ctx->afi->family; | |
729 | ||
730 | /* Re-use the existing target if it's already loaded. */ | |
7965ee93 | 731 | list_for_each_entry(nft_target, &nft_target_list, head) { |
0ca743a5 PNA |
732 | struct xt_target *target = nft_target->ops.data; |
733 | ||
ba378ca9 | 734 | if (nft_target_cmp(target, tg_name, rev, family)) { |
520aa741 PNA |
735 | if (!try_module_get(target->me)) |
736 | return ERR_PTR(-ENOENT); | |
737 | ||
0ca743a5 | 738 | return &nft_target->ops; |
520aa741 | 739 | } |
0ca743a5 PNA |
740 | } |
741 | ||
742 | target = xt_request_find_target(family, tg_name, rev); | |
743 | if (IS_ERR(target)) | |
744 | return ERR_PTR(-ENOENT); | |
745 | ||
f0716cd6 FW |
746 | if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) |
747 | return ERR_PTR(-EINVAL); | |
748 | ||
0ca743a5 PNA |
749 | /* This is the first time we use this target, allocate operations */ |
750 | nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
751 | if (nft_target == NULL) | |
752 | return ERR_PTR(-ENOMEM); | |
753 | ||
754 | nft_target->ops.type = &nft_target_type; | |
756c1b1a | 755 | nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); |
0ca743a5 PNA |
756 | nft_target->ops.init = nft_target_init; |
757 | nft_target->ops.destroy = nft_target_destroy; | |
758 | nft_target->ops.dump = nft_target_dump; | |
759 | nft_target->ops.validate = nft_target_validate; | |
760 | nft_target->ops.data = target; | |
761 | ||
5191f4d8 AB |
762 | if (family == NFPROTO_BRIDGE) |
763 | nft_target->ops.eval = nft_target_eval_bridge; | |
764 | else | |
765 | nft_target->ops.eval = nft_target_eval_xt; | |
766 | ||
0ca743a5 PNA |
767 | list_add(&nft_target->head, &nft_target_list); |
768 | ||
769 | return &nft_target->ops; | |
770 | } | |
771 | ||
772 | static void nft_target_release(void) | |
773 | { | |
c359c415 | 774 | struct nft_xt *nft_target, *tmp; |
0ca743a5 | 775 | |
c359c415 | 776 | list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) |
0ca743a5 PNA |
777 | kfree(nft_target); |
778 | } | |
779 | ||
780 | static struct nft_expr_type nft_target_type __read_mostly = { | |
781 | .name = "target", | |
782 | .select_ops = nft_target_select_ops, | |
783 | .policy = nft_target_policy, | |
784 | .maxattr = NFTA_TARGET_MAX, | |
785 | .owner = THIS_MODULE, | |
786 | }; | |
787 | ||
788 | static int __init nft_compat_module_init(void) | |
789 | { | |
790 | int ret; | |
791 | ||
792 | ret = nft_register_expr(&nft_match_type); | |
793 | if (ret < 0) | |
794 | return ret; | |
795 | ||
796 | ret = nft_register_expr(&nft_target_type); | |
797 | if (ret < 0) | |
798 | goto err_match; | |
799 | ||
800 | ret = nfnetlink_subsys_register(&nfnl_compat_subsys); | |
801 | if (ret < 0) { | |
802 | pr_err("nft_compat: cannot register with nfnetlink.\n"); | |
803 | goto err_target; | |
804 | } | |
805 | ||
806 | pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); | |
807 | ||
808 | return ret; | |
809 | ||
810 | err_target: | |
811 | nft_unregister_expr(&nft_target_type); | |
812 | err_match: | |
813 | nft_unregister_expr(&nft_match_type); | |
814 | return ret; | |
815 | } | |
816 | ||
817 | static void __exit nft_compat_module_exit(void) | |
818 | { | |
819 | nfnetlink_subsys_unregister(&nfnl_compat_subsys); | |
820 | nft_unregister_expr(&nft_target_type); | |
821 | nft_unregister_expr(&nft_match_type); | |
822 | nft_match_release(); | |
823 | nft_target_release(); | |
824 | } | |
825 | ||
826 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); | |
827 | ||
828 | module_init(nft_compat_module_init); | |
829 | module_exit(nft_compat_module_exit); | |
830 | ||
831 | MODULE_LICENSE("GPL"); | |
832 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
833 | MODULE_ALIAS_NFT_EXPR("match"); | |
834 | MODULE_ALIAS_NFT_EXPR("target"); |