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Commit | Line | Data |
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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 | ||
4b512e1c LZ |
26 | struct nft_xt { |
27 | struct list_head head; | |
28 | struct nft_expr_ops ops; | |
29 | unsigned int refcnt; | |
30 | }; | |
31 | ||
32 | static void nft_xt_put(struct nft_xt *xt) | |
33 | { | |
34 | if (--xt->refcnt == 0) { | |
35 | list_del(&xt->head); | |
36 | kfree(xt); | |
37 | } | |
38 | } | |
39 | ||
f3f5dded PNA |
40 | static int nft_compat_chain_validate_dependency(const char *tablename, |
41 | const struct nft_chain *chain) | |
42 | { | |
f3f5dded PNA |
43 | const struct nft_base_chain *basechain; |
44 | ||
45 | if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) | |
46 | return 0; | |
47 | ||
f3f5dded | 48 | basechain = nft_base_chain(chain); |
c918687f PNA |
49 | if (strcmp(tablename, "nat") == 0 && |
50 | basechain->type->type != NFT_CHAIN_T_NAT) | |
f3f5dded PNA |
51 | return -EINVAL; |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
0ca743a5 PNA |
56 | union nft_entry { |
57 | struct ipt_entry e4; | |
58 | struct ip6t_entry e6; | |
5191f4d8 | 59 | struct ebt_entry ebt; |
5f158939 | 60 | struct arpt_entry arp; |
0ca743a5 PNA |
61 | }; |
62 | ||
63 | static inline void | |
64 | nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) | |
65 | { | |
66 | par->target = xt; | |
67 | par->targinfo = xt_info; | |
68 | par->hotdrop = false; | |
69 | } | |
70 | ||
5191f4d8 | 71 | static void nft_target_eval_xt(const struct nft_expr *expr, |
a55e22e9 | 72 | struct nft_regs *regs, |
5191f4d8 | 73 | const struct nft_pktinfo *pkt) |
0ca743a5 PNA |
74 | { |
75 | void *info = nft_expr_priv(expr); | |
76 | struct xt_target *target = expr->ops->data; | |
77 | struct sk_buff *skb = pkt->skb; | |
78 | int ret; | |
79 | ||
80 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
81 | ||
82 | ret = target->target(skb, &pkt->xt); | |
83 | ||
84 | if (pkt->xt.hotdrop) | |
85 | ret = NF_DROP; | |
86 | ||
5191f4d8 | 87 | switch (ret) { |
0ca743a5 | 88 | case XT_CONTINUE: |
a55e22e9 | 89 | regs->verdict.code = NFT_CONTINUE; |
0ca743a5 PNA |
90 | break; |
91 | default: | |
a55e22e9 | 92 | regs->verdict.code = ret; |
0ca743a5 PNA |
93 | break; |
94 | } | |
5191f4d8 AB |
95 | } |
96 | ||
97 | static void nft_target_eval_bridge(const struct nft_expr *expr, | |
a55e22e9 | 98 | struct nft_regs *regs, |
5191f4d8 AB |
99 | const struct nft_pktinfo *pkt) |
100 | { | |
101 | void *info = nft_expr_priv(expr); | |
102 | struct xt_target *target = expr->ops->data; | |
103 | struct sk_buff *skb = pkt->skb; | |
104 | int ret; | |
105 | ||
106 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
107 | ||
108 | ret = target->target(skb, &pkt->xt); | |
109 | ||
110 | if (pkt->xt.hotdrop) | |
111 | ret = NF_DROP; | |
112 | ||
113 | switch (ret) { | |
114 | case EBT_ACCEPT: | |
a55e22e9 | 115 | regs->verdict.code = NF_ACCEPT; |
5191f4d8 AB |
116 | break; |
117 | case EBT_DROP: | |
a55e22e9 | 118 | regs->verdict.code = NF_DROP; |
5191f4d8 AB |
119 | break; |
120 | case EBT_CONTINUE: | |
a55e22e9 | 121 | regs->verdict.code = NFT_CONTINUE; |
5191f4d8 AB |
122 | break; |
123 | case EBT_RETURN: | |
a55e22e9 | 124 | regs->verdict.code = NFT_RETURN; |
5191f4d8 AB |
125 | break; |
126 | default: | |
a55e22e9 | 127 | regs->verdict.code = ret; |
5191f4d8 AB |
128 | break; |
129 | } | |
0ca743a5 PNA |
130 | } |
131 | ||
132 | static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { | |
133 | [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, | |
134 | [NFTA_TARGET_REV] = { .type = NLA_U32 }, | |
135 | [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, | |
136 | }; | |
137 | ||
138 | static void | |
139 | nft_target_set_tgchk_param(struct xt_tgchk_param *par, | |
140 | const struct nft_ctx *ctx, | |
141 | struct xt_target *target, void *info, | |
2156d321 | 142 | union nft_entry *entry, u16 proto, bool inv) |
0ca743a5 | 143 | { |
2daf1b4d | 144 | par->net = ctx->net; |
0ca743a5 PNA |
145 | par->table = ctx->table->name; |
146 | switch (ctx->afi->family) { | |
147 | case AF_INET: | |
148 | entry->e4.ip.proto = proto; | |
149 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
150 | break; | |
151 | case AF_INET6: | |
749177cc PNA |
152 | if (proto) |
153 | entry->e6.ipv6.flags |= IP6T_F_PROTO; | |
154 | ||
0ca743a5 PNA |
155 | entry->e6.ipv6.proto = proto; |
156 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
157 | break; | |
5191f4d8 | 158 | case NFPROTO_BRIDGE: |
2156d321 | 159 | entry->ebt.ethproto = (__force __be16)proto; |
5191f4d8 AB |
160 | entry->ebt.invflags = inv ? EBT_IPROTO : 0; |
161 | break; | |
5f158939 AB |
162 | case NFPROTO_ARP: |
163 | break; | |
0ca743a5 PNA |
164 | } |
165 | par->entryinfo = entry; | |
166 | par->target = target; | |
167 | par->targinfo = info; | |
168 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
169 | const struct nft_base_chain *basechain = | |
170 | nft_base_chain(ctx->chain); | |
115a60b1 | 171 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
172 | |
173 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
174 | } else { |
175 | par->hook_mask = 0; | |
0ca743a5 PNA |
176 | } |
177 | par->family = ctx->afi->family; | |
55917a21 | 178 | par->nft_compat = true; |
0ca743a5 PNA |
179 | } |
180 | ||
181 | static void target_compat_from_user(struct xt_target *t, void *in, void *out) | |
182 | { | |
756c1b1a | 183 | int pad; |
0ca743a5 | 184 | |
756c1b1a PNA |
185 | memcpy(out, in, t->targetsize); |
186 | pad = XT_ALIGN(t->targetsize) - t->targetsize; | |
187 | if (pad > 0) | |
188 | memset(out + t->targetsize, 0, pad); | |
0ca743a5 PNA |
189 | } |
190 | ||
191 | static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { | |
192 | [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, | |
193 | [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, | |
194 | }; | |
195 | ||
2156d321 | 196 | static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv) |
0ca743a5 PNA |
197 | { |
198 | struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; | |
199 | u32 flags; | |
200 | int err; | |
201 | ||
202 | err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, | |
203 | nft_rule_compat_policy); | |
204 | if (err < 0) | |
205 | return err; | |
206 | ||
207 | if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) | |
208 | return -EINVAL; | |
209 | ||
210 | flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); | |
211 | if (flags & ~NFT_RULE_COMPAT_F_MASK) | |
212 | return -EINVAL; | |
213 | if (flags & NFT_RULE_COMPAT_F_INV) | |
214 | *inv = true; | |
215 | ||
8691a9a3 PNA |
216 | *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); |
217 | return 0; | |
0ca743a5 PNA |
218 | } |
219 | ||
220 | static int | |
221 | nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
222 | const struct nlattr * const tb[]) | |
223 | { | |
224 | void *info = nft_expr_priv(expr); | |
225 | struct xt_target *target = expr->ops->data; | |
226 | struct xt_tgchk_param par; | |
227 | size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); | |
2156d321 | 228 | u16 proto = 0; |
0ca743a5 PNA |
229 | bool inv = false; |
230 | union nft_entry e = {}; | |
231 | int ret; | |
232 | ||
233 | target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); | |
234 | ||
8691a9a3 PNA |
235 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
236 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
237 | if (ret < 0) | |
238 | goto err; | |
239 | } | |
0ca743a5 PNA |
240 | |
241 | nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); | |
242 | ||
243 | ret = xt_check_target(&par, size, proto, inv); | |
244 | if (ret < 0) | |
245 | goto err; | |
246 | ||
247 | /* The standard target cannot be used */ | |
248 | if (target->target == NULL) { | |
249 | ret = -EINVAL; | |
250 | goto err; | |
251 | } | |
252 | ||
253 | return 0; | |
254 | err: | |
255 | module_put(target->me); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | static void | |
62472bce | 260 | nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
261 | { |
262 | struct xt_target *target = expr->ops->data; | |
3d9b1421 PNA |
263 | void *info = nft_expr_priv(expr); |
264 | struct xt_tgdtor_param par; | |
265 | ||
266 | par.net = ctx->net; | |
267 | par.target = target; | |
268 | par.targinfo = info; | |
269 | par.family = ctx->afi->family; | |
270 | if (par.target->destroy != NULL) | |
271 | par.target->destroy(&par); | |
0ca743a5 | 272 | |
4b512e1c | 273 | nft_xt_put(container_of(expr->ops, struct nft_xt, ops)); |
0ca743a5 PNA |
274 | module_put(target->me); |
275 | } | |
276 | ||
0ca743a5 PNA |
277 | static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) |
278 | { | |
279 | const struct xt_target *target = expr->ops->data; | |
280 | void *info = nft_expr_priv(expr); | |
281 | ||
282 | if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || | |
283 | nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || | |
756c1b1a | 284 | nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info)) |
0ca743a5 PNA |
285 | goto nla_put_failure; |
286 | ||
287 | return 0; | |
288 | ||
289 | nla_put_failure: | |
290 | return -1; | |
291 | } | |
292 | ||
293 | static int nft_target_validate(const struct nft_ctx *ctx, | |
294 | const struct nft_expr *expr, | |
295 | const struct nft_data **data) | |
296 | { | |
297 | struct xt_target *target = expr->ops->data; | |
298 | unsigned int hook_mask = 0; | |
f3f5dded | 299 | int ret; |
0ca743a5 PNA |
300 | |
301 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
302 | const struct nft_base_chain *basechain = | |
303 | nft_base_chain(ctx->chain); | |
115a60b1 | 304 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
305 | |
306 | hook_mask = 1 << ops->hooknum; | |
f3f5dded PNA |
307 | if (!(hook_mask & target->hooks)) |
308 | return -EINVAL; | |
0ca743a5 | 309 | |
f3f5dded PNA |
310 | ret = nft_compat_chain_validate_dependency(target->table, |
311 | ctx->chain); | |
312 | if (ret < 0) | |
313 | return ret; | |
0ca743a5 PNA |
314 | } |
315 | return 0; | |
316 | } | |
317 | ||
318 | static void nft_match_eval(const struct nft_expr *expr, | |
a55e22e9 | 319 | struct nft_regs *regs, |
0ca743a5 PNA |
320 | const struct nft_pktinfo *pkt) |
321 | { | |
322 | void *info = nft_expr_priv(expr); | |
323 | struct xt_match *match = expr->ops->data; | |
324 | struct sk_buff *skb = pkt->skb; | |
325 | bool ret; | |
326 | ||
327 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); | |
328 | ||
329 | ret = match->match(skb, (struct xt_action_param *)&pkt->xt); | |
330 | ||
331 | if (pkt->xt.hotdrop) { | |
a55e22e9 | 332 | regs->verdict.code = NF_DROP; |
0ca743a5 PNA |
333 | return; |
334 | } | |
335 | ||
c1f86676 DM |
336 | switch (ret ? 1 : 0) { |
337 | case 1: | |
a55e22e9 | 338 | regs->verdict.code = NFT_CONTINUE; |
0ca743a5 | 339 | break; |
c1f86676 | 340 | case 0: |
a55e22e9 | 341 | regs->verdict.code = NFT_BREAK; |
0ca743a5 PNA |
342 | break; |
343 | } | |
344 | } | |
345 | ||
346 | static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { | |
347 | [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, | |
348 | [NFTA_MATCH_REV] = { .type = NLA_U32 }, | |
349 | [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, | |
350 | }; | |
351 | ||
352 | /* struct xt_mtchk_param and xt_tgchk_param look very similar */ | |
353 | static void | |
354 | nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, | |
355 | struct xt_match *match, void *info, | |
2156d321 | 356 | union nft_entry *entry, u16 proto, bool inv) |
0ca743a5 | 357 | { |
2daf1b4d | 358 | par->net = ctx->net; |
0ca743a5 PNA |
359 | par->table = ctx->table->name; |
360 | switch (ctx->afi->family) { | |
361 | case AF_INET: | |
362 | entry->e4.ip.proto = proto; | |
363 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
364 | break; | |
365 | case AF_INET6: | |
749177cc PNA |
366 | if (proto) |
367 | entry->e6.ipv6.flags |= IP6T_F_PROTO; | |
368 | ||
0ca743a5 PNA |
369 | entry->e6.ipv6.proto = proto; |
370 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
371 | break; | |
5191f4d8 | 372 | case NFPROTO_BRIDGE: |
2156d321 | 373 | entry->ebt.ethproto = (__force __be16)proto; |
5191f4d8 AB |
374 | entry->ebt.invflags = inv ? EBT_IPROTO : 0; |
375 | break; | |
5f158939 AB |
376 | case NFPROTO_ARP: |
377 | break; | |
0ca743a5 PNA |
378 | } |
379 | par->entryinfo = entry; | |
380 | par->match = match; | |
381 | par->matchinfo = info; | |
382 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
383 | const struct nft_base_chain *basechain = | |
384 | nft_base_chain(ctx->chain); | |
115a60b1 | 385 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
386 | |
387 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
388 | } else { |
389 | par->hook_mask = 0; | |
0ca743a5 PNA |
390 | } |
391 | par->family = ctx->afi->family; | |
55917a21 | 392 | par->nft_compat = true; |
0ca743a5 PNA |
393 | } |
394 | ||
395 | static void match_compat_from_user(struct xt_match *m, void *in, void *out) | |
396 | { | |
756c1b1a PNA |
397 | int pad; |
398 | ||
399 | memcpy(out, in, m->matchsize); | |
400 | pad = XT_ALIGN(m->matchsize) - m->matchsize; | |
401 | if (pad > 0) | |
402 | memset(out + m->matchsize, 0, pad); | |
0ca743a5 PNA |
403 | } |
404 | ||
405 | static int | |
406 | nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
407 | const struct nlattr * const tb[]) | |
408 | { | |
409 | void *info = nft_expr_priv(expr); | |
410 | struct xt_match *match = expr->ops->data; | |
411 | struct xt_mtchk_param par; | |
412 | size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); | |
2156d321 | 413 | u16 proto = 0; |
0ca743a5 PNA |
414 | bool inv = false; |
415 | union nft_entry e = {}; | |
416 | int ret; | |
417 | ||
418 | match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); | |
419 | ||
8691a9a3 PNA |
420 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
421 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
422 | if (ret < 0) | |
423 | goto err; | |
424 | } | |
0ca743a5 PNA |
425 | |
426 | nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); | |
427 | ||
428 | ret = xt_check_match(&par, size, proto, inv); | |
429 | if (ret < 0) | |
430 | goto err; | |
431 | ||
432 | return 0; | |
433 | err: | |
434 | module_put(match->me); | |
435 | return ret; | |
436 | } | |
437 | ||
438 | static void | |
62472bce | 439 | nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
440 | { |
441 | struct xt_match *match = expr->ops->data; | |
3d9b1421 PNA |
442 | void *info = nft_expr_priv(expr); |
443 | struct xt_mtdtor_param par; | |
444 | ||
445 | par.net = ctx->net; | |
446 | par.match = match; | |
447 | par.matchinfo = info; | |
448 | par.family = ctx->afi->family; | |
449 | if (par.match->destroy != NULL) | |
450 | par.match->destroy(&par); | |
0ca743a5 | 451 | |
4b512e1c | 452 | nft_xt_put(container_of(expr->ops, struct nft_xt, ops)); |
0ca743a5 PNA |
453 | module_put(match->me); |
454 | } | |
455 | ||
0ca743a5 PNA |
456 | static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) |
457 | { | |
458 | void *info = nft_expr_priv(expr); | |
459 | struct xt_match *match = expr->ops->data; | |
460 | ||
461 | if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || | |
462 | nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || | |
756c1b1a | 463 | nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info)) |
0ca743a5 PNA |
464 | goto nla_put_failure; |
465 | ||
466 | return 0; | |
467 | ||
468 | nla_put_failure: | |
469 | return -1; | |
470 | } | |
471 | ||
472 | static int nft_match_validate(const struct nft_ctx *ctx, | |
473 | const struct nft_expr *expr, | |
474 | const struct nft_data **data) | |
475 | { | |
476 | struct xt_match *match = expr->ops->data; | |
477 | unsigned int hook_mask = 0; | |
f3f5dded | 478 | int ret; |
0ca743a5 PNA |
479 | |
480 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
481 | const struct nft_base_chain *basechain = | |
482 | nft_base_chain(ctx->chain); | |
115a60b1 | 483 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
484 | |
485 | hook_mask = 1 << ops->hooknum; | |
f3f5dded PNA |
486 | if (!(hook_mask & match->hooks)) |
487 | return -EINVAL; | |
0ca743a5 | 488 | |
afefb6f9 | 489 | ret = nft_compat_chain_validate_dependency(match->table, |
f3f5dded PNA |
490 | ctx->chain); |
491 | if (ret < 0) | |
492 | return ret; | |
0ca743a5 PNA |
493 | } |
494 | return 0; | |
495 | } | |
496 | ||
497 | static int | |
498 | nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, | |
499 | int event, u16 family, const char *name, | |
500 | int rev, int target) | |
501 | { | |
502 | struct nlmsghdr *nlh; | |
503 | struct nfgenmsg *nfmsg; | |
504 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
505 | ||
506 | event |= NFNL_SUBSYS_NFT_COMPAT << 8; | |
507 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); | |
508 | if (nlh == NULL) | |
509 | goto nlmsg_failure; | |
510 | ||
511 | nfmsg = nlmsg_data(nlh); | |
512 | nfmsg->nfgen_family = family; | |
513 | nfmsg->version = NFNETLINK_V0; | |
514 | nfmsg->res_id = 0; | |
515 | ||
516 | if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || | |
517 | nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || | |
518 | nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) | |
519 | goto nla_put_failure; | |
520 | ||
521 | nlmsg_end(skb, nlh); | |
522 | return skb->len; | |
523 | ||
524 | nlmsg_failure: | |
525 | nla_put_failure: | |
526 | nlmsg_cancel(skb, nlh); | |
527 | return -1; | |
528 | } | |
529 | ||
7b8002a1 PNA |
530 | static int nfnl_compat_get(struct net *net, struct sock *nfnl, |
531 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
532 | const struct nlattr * const tb[]) | |
0ca743a5 PNA |
533 | { |
534 | int ret = 0, target; | |
535 | struct nfgenmsg *nfmsg; | |
536 | const char *fmt; | |
537 | const char *name; | |
538 | u32 rev; | |
539 | struct sk_buff *skb2; | |
540 | ||
541 | if (tb[NFTA_COMPAT_NAME] == NULL || | |
542 | tb[NFTA_COMPAT_REV] == NULL || | |
543 | tb[NFTA_COMPAT_TYPE] == NULL) | |
544 | return -EINVAL; | |
545 | ||
546 | name = nla_data(tb[NFTA_COMPAT_NAME]); | |
547 | rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); | |
548 | target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); | |
549 | ||
550 | nfmsg = nlmsg_data(nlh); | |
551 | ||
552 | switch(nfmsg->nfgen_family) { | |
553 | case AF_INET: | |
554 | fmt = "ipt_%s"; | |
555 | break; | |
556 | case AF_INET6: | |
557 | fmt = "ip6t_%s"; | |
558 | break; | |
5191f4d8 AB |
559 | case NFPROTO_BRIDGE: |
560 | fmt = "ebt_%s"; | |
561 | break; | |
5f158939 AB |
562 | case NFPROTO_ARP: |
563 | fmt = "arpt_%s"; | |
564 | break; | |
0ca743a5 PNA |
565 | default: |
566 | pr_err("nft_compat: unsupported protocol %d\n", | |
567 | nfmsg->nfgen_family); | |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, | |
572 | rev, target, &ret), | |
573 | fmt, name); | |
574 | ||
575 | if (ret < 0) | |
576 | return ret; | |
577 | ||
578 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
579 | if (skb2 == NULL) | |
580 | return -ENOMEM; | |
581 | ||
582 | /* include the best revision for this extension in the message */ | |
583 | if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, | |
584 | nlh->nlmsg_seq, | |
585 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
586 | NFNL_MSG_COMPAT_GET, | |
587 | nfmsg->nfgen_family, | |
588 | name, ret, target) <= 0) { | |
589 | kfree_skb(skb2); | |
590 | return -ENOSPC; | |
591 | } | |
592 | ||
593 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, | |
594 | MSG_DONTWAIT); | |
595 | if (ret > 0) | |
596 | ret = 0; | |
597 | ||
598 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
599 | } | |
600 | ||
601 | static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { | |
602 | [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, | |
603 | .len = NFT_COMPAT_NAME_MAX-1 }, | |
604 | [NFTA_COMPAT_REV] = { .type = NLA_U32 }, | |
605 | [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, | |
606 | }; | |
607 | ||
608 | static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { | |
609 | [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, | |
610 | .attr_count = NFTA_COMPAT_MAX, | |
611 | .policy = nfnl_compat_policy_get }, | |
612 | }; | |
613 | ||
614 | static const struct nfnetlink_subsystem nfnl_compat_subsys = { | |
615 | .name = "nft-compat", | |
616 | .subsys_id = NFNL_SUBSYS_NFT_COMPAT, | |
617 | .cb_count = NFNL_MSG_COMPAT_MAX, | |
618 | .cb = nfnl_nft_compat_cb, | |
619 | }; | |
620 | ||
621 | static LIST_HEAD(nft_match_list); | |
622 | ||
0ca743a5 PNA |
623 | static struct nft_expr_type nft_match_type; |
624 | ||
ba378ca9 PNA |
625 | static bool nft_match_cmp(const struct xt_match *match, |
626 | const char *name, u32 rev, u32 family) | |
627 | { | |
628 | return strcmp(match->name, name) == 0 && match->revision == rev && | |
629 | (match->family == NFPROTO_UNSPEC || match->family == family); | |
630 | } | |
631 | ||
0ca743a5 PNA |
632 | static const struct nft_expr_ops * |
633 | nft_match_select_ops(const struct nft_ctx *ctx, | |
634 | const struct nlattr * const tb[]) | |
635 | { | |
636 | struct nft_xt *nft_match; | |
637 | struct xt_match *match; | |
638 | char *mt_name; | |
ba378ca9 | 639 | u32 rev, family; |
2bf4fade | 640 | int err; |
0ca743a5 PNA |
641 | |
642 | if (tb[NFTA_MATCH_NAME] == NULL || | |
643 | tb[NFTA_MATCH_REV] == NULL || | |
644 | tb[NFTA_MATCH_INFO] == NULL) | |
645 | return ERR_PTR(-EINVAL); | |
646 | ||
647 | mt_name = nla_data(tb[NFTA_MATCH_NAME]); | |
648 | rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); | |
649 | family = ctx->afi->family; | |
650 | ||
651 | /* Re-use the existing match if it's already loaded. */ | |
652 | list_for_each_entry(nft_match, &nft_match_list, head) { | |
653 | struct xt_match *match = nft_match->ops.data; | |
654 | ||
ba378ca9 | 655 | if (nft_match_cmp(match, mt_name, rev, family)) { |
520aa741 PNA |
656 | if (!try_module_get(match->me)) |
657 | return ERR_PTR(-ENOENT); | |
658 | ||
4b512e1c | 659 | nft_match->refcnt++; |
0ca743a5 | 660 | return &nft_match->ops; |
520aa741 | 661 | } |
0ca743a5 PNA |
662 | } |
663 | ||
664 | match = xt_request_find_match(family, mt_name, rev); | |
665 | if (IS_ERR(match)) | |
666 | return ERR_PTR(-ENOENT); | |
667 | ||
2bf4fade LZ |
668 | if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) { |
669 | err = -EINVAL; | |
670 | goto err; | |
671 | } | |
f0716cd6 | 672 | |
0ca743a5 PNA |
673 | /* This is the first time we use this match, allocate operations */ |
674 | nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
2bf4fade LZ |
675 | if (nft_match == NULL) { |
676 | err = -ENOMEM; | |
677 | goto err; | |
678 | } | |
0ca743a5 | 679 | |
4b512e1c | 680 | nft_match->refcnt = 1; |
0ca743a5 | 681 | nft_match->ops.type = &nft_match_type; |
756c1b1a | 682 | nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); |
0ca743a5 PNA |
683 | nft_match->ops.eval = nft_match_eval; |
684 | nft_match->ops.init = nft_match_init; | |
685 | nft_match->ops.destroy = nft_match_destroy; | |
686 | nft_match->ops.dump = nft_match_dump; | |
687 | nft_match->ops.validate = nft_match_validate; | |
688 | nft_match->ops.data = match; | |
689 | ||
690 | list_add(&nft_match->head, &nft_match_list); | |
691 | ||
692 | return &nft_match->ops; | |
2bf4fade LZ |
693 | err: |
694 | module_put(match->me); | |
695 | return ERR_PTR(err); | |
0ca743a5 PNA |
696 | } |
697 | ||
0ca743a5 PNA |
698 | static struct nft_expr_type nft_match_type __read_mostly = { |
699 | .name = "match", | |
700 | .select_ops = nft_match_select_ops, | |
701 | .policy = nft_match_policy, | |
702 | .maxattr = NFTA_MATCH_MAX, | |
703 | .owner = THIS_MODULE, | |
704 | }; | |
705 | ||
706 | static LIST_HEAD(nft_target_list); | |
707 | ||
708 | static struct nft_expr_type nft_target_type; | |
709 | ||
ba378ca9 PNA |
710 | static bool nft_target_cmp(const struct xt_target *tg, |
711 | const char *name, u32 rev, u32 family) | |
712 | { | |
713 | return strcmp(tg->name, name) == 0 && tg->revision == rev && | |
714 | (tg->family == NFPROTO_UNSPEC || tg->family == family); | |
715 | } | |
716 | ||
0ca743a5 PNA |
717 | static const struct nft_expr_ops * |
718 | nft_target_select_ops(const struct nft_ctx *ctx, | |
719 | const struct nlattr * const tb[]) | |
720 | { | |
721 | struct nft_xt *nft_target; | |
722 | struct xt_target *target; | |
723 | char *tg_name; | |
ba378ca9 | 724 | u32 rev, family; |
2bf4fade | 725 | int err; |
0ca743a5 PNA |
726 | |
727 | if (tb[NFTA_TARGET_NAME] == NULL || | |
728 | tb[NFTA_TARGET_REV] == NULL || | |
729 | tb[NFTA_TARGET_INFO] == NULL) | |
730 | return ERR_PTR(-EINVAL); | |
731 | ||
732 | tg_name = nla_data(tb[NFTA_TARGET_NAME]); | |
733 | rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); | |
734 | family = ctx->afi->family; | |
735 | ||
736 | /* Re-use the existing target if it's already loaded. */ | |
7965ee93 | 737 | list_for_each_entry(nft_target, &nft_target_list, head) { |
0ca743a5 PNA |
738 | struct xt_target *target = nft_target->ops.data; |
739 | ||
ba378ca9 | 740 | if (nft_target_cmp(target, tg_name, rev, family)) { |
520aa741 PNA |
741 | if (!try_module_get(target->me)) |
742 | return ERR_PTR(-ENOENT); | |
743 | ||
4b512e1c | 744 | nft_target->refcnt++; |
0ca743a5 | 745 | return &nft_target->ops; |
520aa741 | 746 | } |
0ca743a5 PNA |
747 | } |
748 | ||
749 | target = xt_request_find_target(family, tg_name, rev); | |
750 | if (IS_ERR(target)) | |
751 | return ERR_PTR(-ENOENT); | |
752 | ||
2bf4fade LZ |
753 | if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) { |
754 | err = -EINVAL; | |
755 | goto err; | |
756 | } | |
f0716cd6 | 757 | |
0ca743a5 PNA |
758 | /* This is the first time we use this target, allocate operations */ |
759 | nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
2bf4fade LZ |
760 | if (nft_target == NULL) { |
761 | err = -ENOMEM; | |
762 | goto err; | |
763 | } | |
0ca743a5 | 764 | |
4b512e1c | 765 | nft_target->refcnt = 1; |
0ca743a5 | 766 | nft_target->ops.type = &nft_target_type; |
756c1b1a | 767 | nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); |
0ca743a5 PNA |
768 | nft_target->ops.init = nft_target_init; |
769 | nft_target->ops.destroy = nft_target_destroy; | |
770 | nft_target->ops.dump = nft_target_dump; | |
771 | nft_target->ops.validate = nft_target_validate; | |
772 | nft_target->ops.data = target; | |
773 | ||
5191f4d8 AB |
774 | if (family == NFPROTO_BRIDGE) |
775 | nft_target->ops.eval = nft_target_eval_bridge; | |
776 | else | |
777 | nft_target->ops.eval = nft_target_eval_xt; | |
778 | ||
0ca743a5 PNA |
779 | list_add(&nft_target->head, &nft_target_list); |
780 | ||
781 | return &nft_target->ops; | |
2bf4fade LZ |
782 | err: |
783 | module_put(target->me); | |
784 | return ERR_PTR(err); | |
0ca743a5 PNA |
785 | } |
786 | ||
0ca743a5 PNA |
787 | static struct nft_expr_type nft_target_type __read_mostly = { |
788 | .name = "target", | |
789 | .select_ops = nft_target_select_ops, | |
790 | .policy = nft_target_policy, | |
791 | .maxattr = NFTA_TARGET_MAX, | |
792 | .owner = THIS_MODULE, | |
793 | }; | |
794 | ||
795 | static int __init nft_compat_module_init(void) | |
796 | { | |
797 | int ret; | |
798 | ||
799 | ret = nft_register_expr(&nft_match_type); | |
800 | if (ret < 0) | |
801 | return ret; | |
802 | ||
803 | ret = nft_register_expr(&nft_target_type); | |
804 | if (ret < 0) | |
805 | goto err_match; | |
806 | ||
807 | ret = nfnetlink_subsys_register(&nfnl_compat_subsys); | |
808 | if (ret < 0) { | |
809 | pr_err("nft_compat: cannot register with nfnetlink.\n"); | |
810 | goto err_target; | |
811 | } | |
812 | ||
813 | pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); | |
814 | ||
815 | return ret; | |
816 | ||
817 | err_target: | |
818 | nft_unregister_expr(&nft_target_type); | |
819 | err_match: | |
820 | nft_unregister_expr(&nft_match_type); | |
821 | return ret; | |
822 | } | |
823 | ||
824 | static void __exit nft_compat_module_exit(void) | |
825 | { | |
826 | nfnetlink_subsys_unregister(&nfnl_compat_subsys); | |
827 | nft_unregister_expr(&nft_target_type); | |
828 | nft_unregister_expr(&nft_match_type); | |
0ca743a5 PNA |
829 | } |
830 | ||
831 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); | |
832 | ||
833 | module_init(nft_compat_module_init); | |
834 | module_exit(nft_compat_module_exit); | |
835 | ||
836 | MODULE_LICENSE("GPL"); | |
837 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
838 | MODULE_ALIAS_NFT_EXPR("match"); | |
839 | MODULE_ALIAS_NFT_EXPR("target"); |