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> | |
0ca743a5 PNA |
22 | #include <net/netfilter/nf_tables.h> |
23 | ||
f3f5dded PNA |
24 | static const struct { |
25 | const char *name; | |
26 | u8 type; | |
27 | } table_to_chaintype[] = { | |
28 | { "filter", NFT_CHAIN_T_DEFAULT }, | |
29 | { "raw", NFT_CHAIN_T_DEFAULT }, | |
30 | { "security", NFT_CHAIN_T_DEFAULT }, | |
31 | { "mangle", NFT_CHAIN_T_ROUTE }, | |
32 | { "nat", NFT_CHAIN_T_NAT }, | |
33 | { }, | |
34 | }; | |
35 | ||
36 | static int nft_compat_table_to_chaintype(const char *table) | |
37 | { | |
38 | int i; | |
39 | ||
40 | for (i = 0; table_to_chaintype[i].name != NULL; i++) { | |
41 | if (strcmp(table_to_chaintype[i].name, table) == 0) | |
42 | return table_to_chaintype[i].type; | |
43 | } | |
44 | ||
45 | return -1; | |
46 | } | |
47 | ||
48 | static int nft_compat_chain_validate_dependency(const char *tablename, | |
49 | const struct nft_chain *chain) | |
50 | { | |
51 | enum nft_chain_type type; | |
52 | const struct nft_base_chain *basechain; | |
53 | ||
54 | if (!tablename || !(chain->flags & NFT_BASE_CHAIN)) | |
55 | return 0; | |
56 | ||
57 | type = nft_compat_table_to_chaintype(tablename); | |
58 | if (type < 0) | |
59 | return -EINVAL; | |
60 | ||
61 | basechain = nft_base_chain(chain); | |
62 | if (basechain->type->type != type) | |
63 | return -EINVAL; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
0ca743a5 PNA |
68 | union nft_entry { |
69 | struct ipt_entry e4; | |
70 | struct ip6t_entry e6; | |
71 | }; | |
72 | ||
73 | static inline void | |
74 | nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) | |
75 | { | |
76 | par->target = xt; | |
77 | par->targinfo = xt_info; | |
78 | par->hotdrop = false; | |
79 | } | |
80 | ||
81 | static void nft_target_eval(const struct nft_expr *expr, | |
82 | struct nft_data data[NFT_REG_MAX + 1], | |
83 | const struct nft_pktinfo *pkt) | |
84 | { | |
85 | void *info = nft_expr_priv(expr); | |
86 | struct xt_target *target = expr->ops->data; | |
87 | struct sk_buff *skb = pkt->skb; | |
88 | int ret; | |
89 | ||
90 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
91 | ||
92 | ret = target->target(skb, &pkt->xt); | |
93 | ||
94 | if (pkt->xt.hotdrop) | |
95 | ret = NF_DROP; | |
96 | ||
97 | switch(ret) { | |
98 | case XT_CONTINUE: | |
99 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; | |
100 | break; | |
101 | default: | |
102 | data[NFT_REG_VERDICT].verdict = ret; | |
103 | break; | |
104 | } | |
105 | return; | |
106 | } | |
107 | ||
108 | static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { | |
109 | [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, | |
110 | [NFTA_TARGET_REV] = { .type = NLA_U32 }, | |
111 | [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, | |
112 | }; | |
113 | ||
114 | static void | |
115 | nft_target_set_tgchk_param(struct xt_tgchk_param *par, | |
116 | const struct nft_ctx *ctx, | |
117 | struct xt_target *target, void *info, | |
118 | union nft_entry *entry, u8 proto, bool inv) | |
119 | { | |
120 | par->net = &init_net; | |
121 | par->table = ctx->table->name; | |
122 | switch (ctx->afi->family) { | |
123 | case AF_INET: | |
124 | entry->e4.ip.proto = proto; | |
125 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
126 | break; | |
127 | case AF_INET6: | |
128 | entry->e6.ipv6.proto = proto; | |
129 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
130 | break; | |
131 | } | |
132 | par->entryinfo = entry; | |
133 | par->target = target; | |
134 | par->targinfo = info; | |
135 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
136 | const struct nft_base_chain *basechain = | |
137 | nft_base_chain(ctx->chain); | |
115a60b1 | 138 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
139 | |
140 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
141 | } else { |
142 | par->hook_mask = 0; | |
0ca743a5 PNA |
143 | } |
144 | par->family = ctx->afi->family; | |
145 | } | |
146 | ||
147 | static void target_compat_from_user(struct xt_target *t, void *in, void *out) | |
148 | { | |
756c1b1a | 149 | int pad; |
0ca743a5 | 150 | |
756c1b1a PNA |
151 | memcpy(out, in, t->targetsize); |
152 | pad = XT_ALIGN(t->targetsize) - t->targetsize; | |
153 | if (pad > 0) | |
154 | memset(out + t->targetsize, 0, pad); | |
0ca743a5 PNA |
155 | } |
156 | ||
157 | static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { | |
158 | [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, | |
159 | [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, | |
160 | }; | |
161 | ||
8691a9a3 | 162 | static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv) |
0ca743a5 PNA |
163 | { |
164 | struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; | |
165 | u32 flags; | |
166 | int err; | |
167 | ||
168 | err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, | |
169 | nft_rule_compat_policy); | |
170 | if (err < 0) | |
171 | return err; | |
172 | ||
173 | if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) | |
174 | return -EINVAL; | |
175 | ||
176 | flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); | |
177 | if (flags & ~NFT_RULE_COMPAT_F_MASK) | |
178 | return -EINVAL; | |
179 | if (flags & NFT_RULE_COMPAT_F_INV) | |
180 | *inv = true; | |
181 | ||
8691a9a3 PNA |
182 | *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); |
183 | return 0; | |
0ca743a5 PNA |
184 | } |
185 | ||
186 | static int | |
187 | nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
188 | const struct nlattr * const tb[]) | |
189 | { | |
190 | void *info = nft_expr_priv(expr); | |
191 | struct xt_target *target = expr->ops->data; | |
192 | struct xt_tgchk_param par; | |
193 | size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); | |
194 | u8 proto = 0; | |
195 | bool inv = false; | |
196 | union nft_entry e = {}; | |
197 | int ret; | |
198 | ||
f3f5dded PNA |
199 | ret = nft_compat_chain_validate_dependency(target->table, ctx->chain); |
200 | if (ret < 0) | |
201 | goto err; | |
202 | ||
0ca743a5 PNA |
203 | target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); |
204 | ||
8691a9a3 PNA |
205 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
206 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
207 | if (ret < 0) | |
208 | goto err; | |
209 | } | |
0ca743a5 PNA |
210 | |
211 | nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); | |
212 | ||
213 | ret = xt_check_target(&par, size, proto, inv); | |
214 | if (ret < 0) | |
215 | goto err; | |
216 | ||
217 | /* The standard target cannot be used */ | |
218 | if (target->target == NULL) { | |
219 | ret = -EINVAL; | |
220 | goto err; | |
221 | } | |
222 | ||
223 | return 0; | |
224 | err: | |
225 | module_put(target->me); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | static void | |
62472bce | 230 | nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
231 | { |
232 | struct xt_target *target = expr->ops->data; | |
3d9b1421 PNA |
233 | void *info = nft_expr_priv(expr); |
234 | struct xt_tgdtor_param par; | |
235 | ||
236 | par.net = ctx->net; | |
237 | par.target = target; | |
238 | par.targinfo = info; | |
239 | par.family = ctx->afi->family; | |
240 | if (par.target->destroy != NULL) | |
241 | par.target->destroy(&par); | |
0ca743a5 PNA |
242 | |
243 | module_put(target->me); | |
244 | } | |
245 | ||
0ca743a5 PNA |
246 | static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) |
247 | { | |
248 | const struct xt_target *target = expr->ops->data; | |
249 | void *info = nft_expr_priv(expr); | |
250 | ||
251 | if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || | |
252 | nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || | |
756c1b1a | 253 | nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(target->targetsize), info)) |
0ca743a5 PNA |
254 | goto nla_put_failure; |
255 | ||
256 | return 0; | |
257 | ||
258 | nla_put_failure: | |
259 | return -1; | |
260 | } | |
261 | ||
262 | static int nft_target_validate(const struct nft_ctx *ctx, | |
263 | const struct nft_expr *expr, | |
264 | const struct nft_data **data) | |
265 | { | |
266 | struct xt_target *target = expr->ops->data; | |
267 | unsigned int hook_mask = 0; | |
f3f5dded | 268 | int ret; |
0ca743a5 PNA |
269 | |
270 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
271 | const struct nft_base_chain *basechain = | |
272 | nft_base_chain(ctx->chain); | |
115a60b1 | 273 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
274 | |
275 | hook_mask = 1 << ops->hooknum; | |
f3f5dded PNA |
276 | if (!(hook_mask & target->hooks)) |
277 | return -EINVAL; | |
0ca743a5 | 278 | |
f3f5dded PNA |
279 | ret = nft_compat_chain_validate_dependency(target->table, |
280 | ctx->chain); | |
281 | if (ret < 0) | |
282 | return ret; | |
0ca743a5 PNA |
283 | } |
284 | return 0; | |
285 | } | |
286 | ||
287 | static void nft_match_eval(const struct nft_expr *expr, | |
288 | struct nft_data data[NFT_REG_MAX + 1], | |
289 | const struct nft_pktinfo *pkt) | |
290 | { | |
291 | void *info = nft_expr_priv(expr); | |
292 | struct xt_match *match = expr->ops->data; | |
293 | struct sk_buff *skb = pkt->skb; | |
294 | bool ret; | |
295 | ||
296 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); | |
297 | ||
298 | ret = match->match(skb, (struct xt_action_param *)&pkt->xt); | |
299 | ||
300 | if (pkt->xt.hotdrop) { | |
301 | data[NFT_REG_VERDICT].verdict = NF_DROP; | |
302 | return; | |
303 | } | |
304 | ||
305 | switch(ret) { | |
306 | case true: | |
307 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; | |
308 | break; | |
309 | case false: | |
310 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; | |
311 | break; | |
312 | } | |
313 | } | |
314 | ||
315 | static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { | |
316 | [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, | |
317 | [NFTA_MATCH_REV] = { .type = NLA_U32 }, | |
318 | [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, | |
319 | }; | |
320 | ||
321 | /* struct xt_mtchk_param and xt_tgchk_param look very similar */ | |
322 | static void | |
323 | nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, | |
324 | struct xt_match *match, void *info, | |
325 | union nft_entry *entry, u8 proto, bool inv) | |
326 | { | |
327 | par->net = &init_net; | |
328 | par->table = ctx->table->name; | |
329 | switch (ctx->afi->family) { | |
330 | case AF_INET: | |
331 | entry->e4.ip.proto = proto; | |
332 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
333 | break; | |
334 | case AF_INET6: | |
335 | entry->e6.ipv6.proto = proto; | |
336 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
337 | break; | |
338 | } | |
339 | par->entryinfo = entry; | |
340 | par->match = match; | |
341 | par->matchinfo = info; | |
342 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
343 | const struct nft_base_chain *basechain = | |
344 | nft_base_chain(ctx->chain); | |
115a60b1 | 345 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
346 | |
347 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
348 | } else { |
349 | par->hook_mask = 0; | |
0ca743a5 PNA |
350 | } |
351 | par->family = ctx->afi->family; | |
352 | } | |
353 | ||
354 | static void match_compat_from_user(struct xt_match *m, void *in, void *out) | |
355 | { | |
756c1b1a PNA |
356 | int pad; |
357 | ||
358 | memcpy(out, in, m->matchsize); | |
359 | pad = XT_ALIGN(m->matchsize) - m->matchsize; | |
360 | if (pad > 0) | |
361 | memset(out + m->matchsize, 0, pad); | |
0ca743a5 PNA |
362 | } |
363 | ||
364 | static int | |
365 | nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
366 | const struct nlattr * const tb[]) | |
367 | { | |
368 | void *info = nft_expr_priv(expr); | |
369 | struct xt_match *match = expr->ops->data; | |
370 | struct xt_mtchk_param par; | |
371 | size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); | |
372 | u8 proto = 0; | |
373 | bool inv = false; | |
374 | union nft_entry e = {}; | |
375 | int ret; | |
376 | ||
f3f5dded PNA |
377 | ret = nft_compat_chain_validate_dependency(match->name, ctx->chain); |
378 | if (ret < 0) | |
379 | goto err; | |
380 | ||
0ca743a5 PNA |
381 | match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); |
382 | ||
8691a9a3 PNA |
383 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
384 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
385 | if (ret < 0) | |
386 | goto err; | |
387 | } | |
0ca743a5 PNA |
388 | |
389 | nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); | |
390 | ||
391 | ret = xt_check_match(&par, size, proto, inv); | |
392 | if (ret < 0) | |
393 | goto err; | |
394 | ||
395 | return 0; | |
396 | err: | |
397 | module_put(match->me); | |
398 | return ret; | |
399 | } | |
400 | ||
401 | static void | |
62472bce | 402 | nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
403 | { |
404 | struct xt_match *match = expr->ops->data; | |
3d9b1421 PNA |
405 | void *info = nft_expr_priv(expr); |
406 | struct xt_mtdtor_param par; | |
407 | ||
408 | par.net = ctx->net; | |
409 | par.match = match; | |
410 | par.matchinfo = info; | |
411 | par.family = ctx->afi->family; | |
412 | if (par.match->destroy != NULL) | |
413 | par.match->destroy(&par); | |
0ca743a5 PNA |
414 | |
415 | module_put(match->me); | |
416 | } | |
417 | ||
0ca743a5 PNA |
418 | static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) |
419 | { | |
420 | void *info = nft_expr_priv(expr); | |
421 | struct xt_match *match = expr->ops->data; | |
422 | ||
423 | if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || | |
424 | nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || | |
756c1b1a | 425 | nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(match->matchsize), info)) |
0ca743a5 PNA |
426 | goto nla_put_failure; |
427 | ||
428 | return 0; | |
429 | ||
430 | nla_put_failure: | |
431 | return -1; | |
432 | } | |
433 | ||
434 | static int nft_match_validate(const struct nft_ctx *ctx, | |
435 | const struct nft_expr *expr, | |
436 | const struct nft_data **data) | |
437 | { | |
438 | struct xt_match *match = expr->ops->data; | |
439 | unsigned int hook_mask = 0; | |
f3f5dded | 440 | int ret; |
0ca743a5 PNA |
441 | |
442 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
443 | const struct nft_base_chain *basechain = | |
444 | nft_base_chain(ctx->chain); | |
115a60b1 | 445 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
446 | |
447 | hook_mask = 1 << ops->hooknum; | |
f3f5dded PNA |
448 | if (!(hook_mask & match->hooks)) |
449 | return -EINVAL; | |
0ca743a5 | 450 | |
f3f5dded PNA |
451 | ret = nft_compat_chain_validate_dependency(match->name, |
452 | ctx->chain); | |
453 | if (ret < 0) | |
454 | return ret; | |
0ca743a5 PNA |
455 | } |
456 | return 0; | |
457 | } | |
458 | ||
459 | static int | |
460 | nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, | |
461 | int event, u16 family, const char *name, | |
462 | int rev, int target) | |
463 | { | |
464 | struct nlmsghdr *nlh; | |
465 | struct nfgenmsg *nfmsg; | |
466 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
467 | ||
468 | event |= NFNL_SUBSYS_NFT_COMPAT << 8; | |
469 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); | |
470 | if (nlh == NULL) | |
471 | goto nlmsg_failure; | |
472 | ||
473 | nfmsg = nlmsg_data(nlh); | |
474 | nfmsg->nfgen_family = family; | |
475 | nfmsg->version = NFNETLINK_V0; | |
476 | nfmsg->res_id = 0; | |
477 | ||
478 | if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || | |
479 | nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || | |
480 | nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) | |
481 | goto nla_put_failure; | |
482 | ||
483 | nlmsg_end(skb, nlh); | |
484 | return skb->len; | |
485 | ||
486 | nlmsg_failure: | |
487 | nla_put_failure: | |
488 | nlmsg_cancel(skb, nlh); | |
489 | return -1; | |
490 | } | |
491 | ||
492 | static int | |
493 | nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb, | |
494 | const struct nlmsghdr *nlh, const struct nlattr * const tb[]) | |
495 | { | |
496 | int ret = 0, target; | |
497 | struct nfgenmsg *nfmsg; | |
498 | const char *fmt; | |
499 | const char *name; | |
500 | u32 rev; | |
501 | struct sk_buff *skb2; | |
502 | ||
503 | if (tb[NFTA_COMPAT_NAME] == NULL || | |
504 | tb[NFTA_COMPAT_REV] == NULL || | |
505 | tb[NFTA_COMPAT_TYPE] == NULL) | |
506 | return -EINVAL; | |
507 | ||
508 | name = nla_data(tb[NFTA_COMPAT_NAME]); | |
509 | rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); | |
510 | target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); | |
511 | ||
512 | nfmsg = nlmsg_data(nlh); | |
513 | ||
514 | switch(nfmsg->nfgen_family) { | |
515 | case AF_INET: | |
516 | fmt = "ipt_%s"; | |
517 | break; | |
518 | case AF_INET6: | |
519 | fmt = "ip6t_%s"; | |
520 | break; | |
521 | default: | |
522 | pr_err("nft_compat: unsupported protocol %d\n", | |
523 | nfmsg->nfgen_family); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, | |
528 | rev, target, &ret), | |
529 | fmt, name); | |
530 | ||
531 | if (ret < 0) | |
532 | return ret; | |
533 | ||
534 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
535 | if (skb2 == NULL) | |
536 | return -ENOMEM; | |
537 | ||
538 | /* include the best revision for this extension in the message */ | |
539 | if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, | |
540 | nlh->nlmsg_seq, | |
541 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
542 | NFNL_MSG_COMPAT_GET, | |
543 | nfmsg->nfgen_family, | |
544 | name, ret, target) <= 0) { | |
545 | kfree_skb(skb2); | |
546 | return -ENOSPC; | |
547 | } | |
548 | ||
549 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, | |
550 | MSG_DONTWAIT); | |
551 | if (ret > 0) | |
552 | ret = 0; | |
553 | ||
554 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
555 | } | |
556 | ||
557 | static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { | |
558 | [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, | |
559 | .len = NFT_COMPAT_NAME_MAX-1 }, | |
560 | [NFTA_COMPAT_REV] = { .type = NLA_U32 }, | |
561 | [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, | |
562 | }; | |
563 | ||
564 | static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { | |
565 | [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, | |
566 | .attr_count = NFTA_COMPAT_MAX, | |
567 | .policy = nfnl_compat_policy_get }, | |
568 | }; | |
569 | ||
570 | static const struct nfnetlink_subsystem nfnl_compat_subsys = { | |
571 | .name = "nft-compat", | |
572 | .subsys_id = NFNL_SUBSYS_NFT_COMPAT, | |
573 | .cb_count = NFNL_MSG_COMPAT_MAX, | |
574 | .cb = nfnl_nft_compat_cb, | |
575 | }; | |
576 | ||
577 | static LIST_HEAD(nft_match_list); | |
578 | ||
579 | struct nft_xt { | |
580 | struct list_head head; | |
581 | struct nft_expr_ops ops; | |
582 | }; | |
583 | ||
584 | static struct nft_expr_type nft_match_type; | |
585 | ||
586 | static const struct nft_expr_ops * | |
587 | nft_match_select_ops(const struct nft_ctx *ctx, | |
588 | const struct nlattr * const tb[]) | |
589 | { | |
590 | struct nft_xt *nft_match; | |
591 | struct xt_match *match; | |
592 | char *mt_name; | |
593 | __u32 rev, family; | |
594 | ||
595 | if (tb[NFTA_MATCH_NAME] == NULL || | |
596 | tb[NFTA_MATCH_REV] == NULL || | |
597 | tb[NFTA_MATCH_INFO] == NULL) | |
598 | return ERR_PTR(-EINVAL); | |
599 | ||
600 | mt_name = nla_data(tb[NFTA_MATCH_NAME]); | |
601 | rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); | |
602 | family = ctx->afi->family; | |
603 | ||
604 | /* Re-use the existing match if it's already loaded. */ | |
605 | list_for_each_entry(nft_match, &nft_match_list, head) { | |
606 | struct xt_match *match = nft_match->ops.data; | |
607 | ||
608 | if (strcmp(match->name, mt_name) == 0 && | |
609 | match->revision == rev && match->family == family) | |
610 | return &nft_match->ops; | |
611 | } | |
612 | ||
613 | match = xt_request_find_match(family, mt_name, rev); | |
614 | if (IS_ERR(match)) | |
615 | return ERR_PTR(-ENOENT); | |
616 | ||
617 | /* This is the first time we use this match, allocate operations */ | |
618 | nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
619 | if (nft_match == NULL) | |
620 | return ERR_PTR(-ENOMEM); | |
621 | ||
622 | nft_match->ops.type = &nft_match_type; | |
756c1b1a | 623 | nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); |
0ca743a5 PNA |
624 | nft_match->ops.eval = nft_match_eval; |
625 | nft_match->ops.init = nft_match_init; | |
626 | nft_match->ops.destroy = nft_match_destroy; | |
627 | nft_match->ops.dump = nft_match_dump; | |
628 | nft_match->ops.validate = nft_match_validate; | |
629 | nft_match->ops.data = match; | |
630 | ||
631 | list_add(&nft_match->head, &nft_match_list); | |
632 | ||
633 | return &nft_match->ops; | |
634 | } | |
635 | ||
636 | static void nft_match_release(void) | |
637 | { | |
c359c415 | 638 | struct nft_xt *nft_match, *tmp; |
0ca743a5 | 639 | |
c359c415 | 640 | list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) |
0ca743a5 PNA |
641 | kfree(nft_match); |
642 | } | |
643 | ||
644 | static struct nft_expr_type nft_match_type __read_mostly = { | |
645 | .name = "match", | |
646 | .select_ops = nft_match_select_ops, | |
647 | .policy = nft_match_policy, | |
648 | .maxattr = NFTA_MATCH_MAX, | |
649 | .owner = THIS_MODULE, | |
650 | }; | |
651 | ||
652 | static LIST_HEAD(nft_target_list); | |
653 | ||
654 | static struct nft_expr_type nft_target_type; | |
655 | ||
656 | static const struct nft_expr_ops * | |
657 | nft_target_select_ops(const struct nft_ctx *ctx, | |
658 | const struct nlattr * const tb[]) | |
659 | { | |
660 | struct nft_xt *nft_target; | |
661 | struct xt_target *target; | |
662 | char *tg_name; | |
663 | __u32 rev, family; | |
664 | ||
665 | if (tb[NFTA_TARGET_NAME] == NULL || | |
666 | tb[NFTA_TARGET_REV] == NULL || | |
667 | tb[NFTA_TARGET_INFO] == NULL) | |
668 | return ERR_PTR(-EINVAL); | |
669 | ||
670 | tg_name = nla_data(tb[NFTA_TARGET_NAME]); | |
671 | rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); | |
672 | family = ctx->afi->family; | |
673 | ||
674 | /* Re-use the existing target if it's already loaded. */ | |
675 | list_for_each_entry(nft_target, &nft_match_list, head) { | |
676 | struct xt_target *target = nft_target->ops.data; | |
677 | ||
678 | if (strcmp(target->name, tg_name) == 0 && | |
679 | target->revision == rev && target->family == family) | |
680 | return &nft_target->ops; | |
681 | } | |
682 | ||
683 | target = xt_request_find_target(family, tg_name, rev); | |
684 | if (IS_ERR(target)) | |
685 | return ERR_PTR(-ENOENT); | |
686 | ||
687 | /* This is the first time we use this target, allocate operations */ | |
688 | nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
689 | if (nft_target == NULL) | |
690 | return ERR_PTR(-ENOMEM); | |
691 | ||
692 | nft_target->ops.type = &nft_target_type; | |
756c1b1a | 693 | nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); |
0ca743a5 PNA |
694 | nft_target->ops.eval = nft_target_eval; |
695 | nft_target->ops.init = nft_target_init; | |
696 | nft_target->ops.destroy = nft_target_destroy; | |
697 | nft_target->ops.dump = nft_target_dump; | |
698 | nft_target->ops.validate = nft_target_validate; | |
699 | nft_target->ops.data = target; | |
700 | ||
701 | list_add(&nft_target->head, &nft_target_list); | |
702 | ||
703 | return &nft_target->ops; | |
704 | } | |
705 | ||
706 | static void nft_target_release(void) | |
707 | { | |
c359c415 | 708 | struct nft_xt *nft_target, *tmp; |
0ca743a5 | 709 | |
c359c415 | 710 | list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) |
0ca743a5 PNA |
711 | kfree(nft_target); |
712 | } | |
713 | ||
714 | static struct nft_expr_type nft_target_type __read_mostly = { | |
715 | .name = "target", | |
716 | .select_ops = nft_target_select_ops, | |
717 | .policy = nft_target_policy, | |
718 | .maxattr = NFTA_TARGET_MAX, | |
719 | .owner = THIS_MODULE, | |
720 | }; | |
721 | ||
722 | static int __init nft_compat_module_init(void) | |
723 | { | |
724 | int ret; | |
725 | ||
726 | ret = nft_register_expr(&nft_match_type); | |
727 | if (ret < 0) | |
728 | return ret; | |
729 | ||
730 | ret = nft_register_expr(&nft_target_type); | |
731 | if (ret < 0) | |
732 | goto err_match; | |
733 | ||
734 | ret = nfnetlink_subsys_register(&nfnl_compat_subsys); | |
735 | if (ret < 0) { | |
736 | pr_err("nft_compat: cannot register with nfnetlink.\n"); | |
737 | goto err_target; | |
738 | } | |
739 | ||
740 | pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); | |
741 | ||
742 | return ret; | |
743 | ||
744 | err_target: | |
745 | nft_unregister_expr(&nft_target_type); | |
746 | err_match: | |
747 | nft_unregister_expr(&nft_match_type); | |
748 | return ret; | |
749 | } | |
750 | ||
751 | static void __exit nft_compat_module_exit(void) | |
752 | { | |
753 | nfnetlink_subsys_unregister(&nfnl_compat_subsys); | |
754 | nft_unregister_expr(&nft_target_type); | |
755 | nft_unregister_expr(&nft_match_type); | |
756 | nft_match_release(); | |
757 | nft_target_release(); | |
758 | } | |
759 | ||
760 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); | |
761 | ||
762 | module_init(nft_compat_module_init); | |
763 | module_exit(nft_compat_module_exit); | |
764 | ||
765 | MODULE_LICENSE("GPL"); | |
766 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
767 | MODULE_ALIAS_NFT_EXPR("match"); | |
768 | MODULE_ALIAS_NFT_EXPR("target"); |