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> | |
22 | #include <asm/uaccess.h> /* for set_fs */ | |
23 | #include <net/netfilter/nf_tables.h> | |
24 | ||
25 | union nft_entry { | |
26 | struct ipt_entry e4; | |
27 | struct ip6t_entry e6; | |
28 | }; | |
29 | ||
30 | static inline void | |
31 | nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) | |
32 | { | |
33 | par->target = xt; | |
34 | par->targinfo = xt_info; | |
35 | par->hotdrop = false; | |
36 | } | |
37 | ||
38 | static void nft_target_eval(const struct nft_expr *expr, | |
39 | struct nft_data data[NFT_REG_MAX + 1], | |
40 | const struct nft_pktinfo *pkt) | |
41 | { | |
42 | void *info = nft_expr_priv(expr); | |
43 | struct xt_target *target = expr->ops->data; | |
44 | struct sk_buff *skb = pkt->skb; | |
45 | int ret; | |
46 | ||
47 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
48 | ||
49 | ret = target->target(skb, &pkt->xt); | |
50 | ||
51 | if (pkt->xt.hotdrop) | |
52 | ret = NF_DROP; | |
53 | ||
54 | switch(ret) { | |
55 | case XT_CONTINUE: | |
56 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; | |
57 | break; | |
58 | default: | |
59 | data[NFT_REG_VERDICT].verdict = ret; | |
60 | break; | |
61 | } | |
62 | return; | |
63 | } | |
64 | ||
65 | static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { | |
66 | [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, | |
67 | [NFTA_TARGET_REV] = { .type = NLA_U32 }, | |
68 | [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, | |
69 | }; | |
70 | ||
71 | static void | |
72 | nft_target_set_tgchk_param(struct xt_tgchk_param *par, | |
73 | const struct nft_ctx *ctx, | |
74 | struct xt_target *target, void *info, | |
75 | union nft_entry *entry, u8 proto, bool inv) | |
76 | { | |
77 | par->net = &init_net; | |
78 | par->table = ctx->table->name; | |
79 | switch (ctx->afi->family) { | |
80 | case AF_INET: | |
81 | entry->e4.ip.proto = proto; | |
82 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
83 | break; | |
84 | case AF_INET6: | |
85 | entry->e6.ipv6.proto = proto; | |
86 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
87 | break; | |
88 | } | |
89 | par->entryinfo = entry; | |
90 | par->target = target; | |
91 | par->targinfo = info; | |
92 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
93 | const struct nft_base_chain *basechain = | |
94 | nft_base_chain(ctx->chain); | |
115a60b1 | 95 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
96 | |
97 | par->hook_mask = 1 << ops->hooknum; | |
98 | } | |
99 | par->family = ctx->afi->family; | |
100 | } | |
101 | ||
102 | static void target_compat_from_user(struct xt_target *t, void *in, void *out) | |
103 | { | |
104 | #ifdef CONFIG_COMPAT | |
105 | if (t->compat_from_user) { | |
106 | int pad; | |
107 | ||
108 | t->compat_from_user(out, in); | |
109 | pad = XT_ALIGN(t->targetsize) - t->targetsize; | |
110 | if (pad > 0) | |
111 | memset(out + t->targetsize, 0, pad); | |
112 | } else | |
113 | #endif | |
114 | memcpy(out, in, XT_ALIGN(t->targetsize)); | |
115 | } | |
116 | ||
117 | static inline int nft_compat_target_offset(struct xt_target *target) | |
118 | { | |
119 | #ifdef CONFIG_COMPAT | |
120 | return xt_compat_target_offset(target); | |
121 | #else | |
122 | return 0; | |
123 | #endif | |
124 | } | |
125 | ||
126 | static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { | |
127 | [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, | |
128 | [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, | |
129 | }; | |
130 | ||
8691a9a3 | 131 | static int nft_parse_compat(const struct nlattr *attr, u8 *proto, bool *inv) |
0ca743a5 PNA |
132 | { |
133 | struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; | |
134 | u32 flags; | |
135 | int err; | |
136 | ||
137 | err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr, | |
138 | nft_rule_compat_policy); | |
139 | if (err < 0) | |
140 | return err; | |
141 | ||
142 | if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) | |
143 | return -EINVAL; | |
144 | ||
145 | flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); | |
146 | if (flags & ~NFT_RULE_COMPAT_F_MASK) | |
147 | return -EINVAL; | |
148 | if (flags & NFT_RULE_COMPAT_F_INV) | |
149 | *inv = true; | |
150 | ||
8691a9a3 PNA |
151 | *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); |
152 | return 0; | |
0ca743a5 PNA |
153 | } |
154 | ||
155 | static int | |
156 | nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
157 | const struct nlattr * const tb[]) | |
158 | { | |
159 | void *info = nft_expr_priv(expr); | |
160 | struct xt_target *target = expr->ops->data; | |
161 | struct xt_tgchk_param par; | |
162 | size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); | |
163 | u8 proto = 0; | |
164 | bool inv = false; | |
165 | union nft_entry e = {}; | |
166 | int ret; | |
167 | ||
168 | target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); | |
169 | ||
8691a9a3 PNA |
170 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
171 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
172 | if (ret < 0) | |
173 | goto err; | |
174 | } | |
0ca743a5 PNA |
175 | |
176 | nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); | |
177 | ||
178 | ret = xt_check_target(&par, size, proto, inv); | |
179 | if (ret < 0) | |
180 | goto err; | |
181 | ||
182 | /* The standard target cannot be used */ | |
183 | if (target->target == NULL) { | |
184 | ret = -EINVAL; | |
185 | goto err; | |
186 | } | |
187 | ||
188 | return 0; | |
189 | err: | |
190 | module_put(target->me); | |
191 | return ret; | |
192 | } | |
193 | ||
194 | static void | |
62472bce | 195 | nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
196 | { |
197 | struct xt_target *target = expr->ops->data; | |
198 | ||
199 | module_put(target->me); | |
200 | } | |
201 | ||
202 | static int | |
203 | target_dump_info(struct sk_buff *skb, const struct xt_target *t, const void *in) | |
204 | { | |
205 | int ret; | |
206 | ||
207 | #ifdef CONFIG_COMPAT | |
208 | if (t->compat_to_user) { | |
209 | mm_segment_t old_fs; | |
210 | void *out; | |
211 | ||
212 | out = kmalloc(XT_ALIGN(t->targetsize), GFP_ATOMIC); | |
213 | if (out == NULL) | |
214 | return -ENOMEM; | |
215 | ||
216 | /* We want to reuse existing compat_to_user */ | |
217 | old_fs = get_fs(); | |
218 | set_fs(KERNEL_DS); | |
219 | t->compat_to_user(out, in); | |
220 | set_fs(old_fs); | |
221 | ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), out); | |
222 | kfree(out); | |
223 | } else | |
224 | #endif | |
225 | ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), in); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
231 | { | |
232 | const struct xt_target *target = expr->ops->data; | |
233 | void *info = nft_expr_priv(expr); | |
234 | ||
235 | if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || | |
236 | nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || | |
237 | target_dump_info(skb, target, info)) | |
238 | goto nla_put_failure; | |
239 | ||
240 | return 0; | |
241 | ||
242 | nla_put_failure: | |
243 | return -1; | |
244 | } | |
245 | ||
246 | static int nft_target_validate(const struct nft_ctx *ctx, | |
247 | const struct nft_expr *expr, | |
248 | const struct nft_data **data) | |
249 | { | |
250 | struct xt_target *target = expr->ops->data; | |
251 | unsigned int hook_mask = 0; | |
252 | ||
253 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
254 | const struct nft_base_chain *basechain = | |
255 | nft_base_chain(ctx->chain); | |
115a60b1 | 256 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
257 | |
258 | hook_mask = 1 << ops->hooknum; | |
259 | if (hook_mask & target->hooks) | |
260 | return 0; | |
261 | ||
262 | /* This target is being called from an invalid chain */ | |
263 | return -EINVAL; | |
264 | } | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static void nft_match_eval(const struct nft_expr *expr, | |
269 | struct nft_data data[NFT_REG_MAX + 1], | |
270 | const struct nft_pktinfo *pkt) | |
271 | { | |
272 | void *info = nft_expr_priv(expr); | |
273 | struct xt_match *match = expr->ops->data; | |
274 | struct sk_buff *skb = pkt->skb; | |
275 | bool ret; | |
276 | ||
277 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); | |
278 | ||
279 | ret = match->match(skb, (struct xt_action_param *)&pkt->xt); | |
280 | ||
281 | if (pkt->xt.hotdrop) { | |
282 | data[NFT_REG_VERDICT].verdict = NF_DROP; | |
283 | return; | |
284 | } | |
285 | ||
286 | switch(ret) { | |
287 | case true: | |
288 | data[NFT_REG_VERDICT].verdict = NFT_CONTINUE; | |
289 | break; | |
290 | case false: | |
291 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; | |
292 | break; | |
293 | } | |
294 | } | |
295 | ||
296 | static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { | |
297 | [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, | |
298 | [NFTA_MATCH_REV] = { .type = NLA_U32 }, | |
299 | [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, | |
300 | }; | |
301 | ||
302 | /* struct xt_mtchk_param and xt_tgchk_param look very similar */ | |
303 | static void | |
304 | nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, | |
305 | struct xt_match *match, void *info, | |
306 | union nft_entry *entry, u8 proto, bool inv) | |
307 | { | |
308 | par->net = &init_net; | |
309 | par->table = ctx->table->name; | |
310 | switch (ctx->afi->family) { | |
311 | case AF_INET: | |
312 | entry->e4.ip.proto = proto; | |
313 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
314 | break; | |
315 | case AF_INET6: | |
316 | entry->e6.ipv6.proto = proto; | |
317 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
318 | break; | |
319 | } | |
320 | par->entryinfo = entry; | |
321 | par->match = match; | |
322 | par->matchinfo = info; | |
323 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
324 | const struct nft_base_chain *basechain = | |
325 | nft_base_chain(ctx->chain); | |
115a60b1 | 326 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
327 | |
328 | par->hook_mask = 1 << ops->hooknum; | |
329 | } | |
330 | par->family = ctx->afi->family; | |
331 | } | |
332 | ||
333 | static void match_compat_from_user(struct xt_match *m, void *in, void *out) | |
334 | { | |
335 | #ifdef CONFIG_COMPAT | |
336 | if (m->compat_from_user) { | |
337 | int pad; | |
338 | ||
339 | m->compat_from_user(out, in); | |
340 | pad = XT_ALIGN(m->matchsize) - m->matchsize; | |
341 | if (pad > 0) | |
342 | memset(out + m->matchsize, 0, pad); | |
343 | } else | |
344 | #endif | |
345 | memcpy(out, in, XT_ALIGN(m->matchsize)); | |
346 | } | |
347 | ||
348 | static int | |
349 | nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
350 | const struct nlattr * const tb[]) | |
351 | { | |
352 | void *info = nft_expr_priv(expr); | |
353 | struct xt_match *match = expr->ops->data; | |
354 | struct xt_mtchk_param par; | |
355 | size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); | |
356 | u8 proto = 0; | |
357 | bool inv = false; | |
358 | union nft_entry e = {}; | |
359 | int ret; | |
360 | ||
361 | match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); | |
362 | ||
8691a9a3 PNA |
363 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
364 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
365 | if (ret < 0) | |
366 | goto err; | |
367 | } | |
0ca743a5 PNA |
368 | |
369 | nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); | |
370 | ||
371 | ret = xt_check_match(&par, size, proto, inv); | |
372 | if (ret < 0) | |
373 | goto err; | |
374 | ||
375 | return 0; | |
376 | err: | |
377 | module_put(match->me); | |
378 | return ret; | |
379 | } | |
380 | ||
381 | static void | |
62472bce | 382 | nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
383 | { |
384 | struct xt_match *match = expr->ops->data; | |
385 | ||
386 | module_put(match->me); | |
387 | } | |
388 | ||
389 | static int | |
390 | match_dump_info(struct sk_buff *skb, const struct xt_match *m, const void *in) | |
391 | { | |
392 | int ret; | |
393 | ||
394 | #ifdef CONFIG_COMPAT | |
395 | if (m->compat_to_user) { | |
396 | mm_segment_t old_fs; | |
397 | void *out; | |
398 | ||
399 | out = kmalloc(XT_ALIGN(m->matchsize), GFP_ATOMIC); | |
400 | if (out == NULL) | |
401 | return -ENOMEM; | |
402 | ||
403 | /* We want to reuse existing compat_to_user */ | |
404 | old_fs = get_fs(); | |
405 | set_fs(KERNEL_DS); | |
406 | m->compat_to_user(out, in); | |
407 | set_fs(old_fs); | |
408 | ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), out); | |
409 | kfree(out); | |
410 | } else | |
411 | #endif | |
412 | ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), in); | |
413 | ||
414 | return ret; | |
415 | } | |
416 | ||
417 | static inline int nft_compat_match_offset(struct xt_match *match) | |
418 | { | |
419 | #ifdef CONFIG_COMPAT | |
420 | return xt_compat_match_offset(match); | |
421 | #else | |
422 | return 0; | |
423 | #endif | |
424 | } | |
425 | ||
426 | static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
427 | { | |
428 | void *info = nft_expr_priv(expr); | |
429 | struct xt_match *match = expr->ops->data; | |
430 | ||
431 | if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || | |
432 | nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || | |
433 | match_dump_info(skb, match, info)) | |
434 | goto nla_put_failure; | |
435 | ||
436 | return 0; | |
437 | ||
438 | nla_put_failure: | |
439 | return -1; | |
440 | } | |
441 | ||
442 | static int nft_match_validate(const struct nft_ctx *ctx, | |
443 | const struct nft_expr *expr, | |
444 | const struct nft_data **data) | |
445 | { | |
446 | struct xt_match *match = expr->ops->data; | |
447 | unsigned int hook_mask = 0; | |
448 | ||
449 | if (ctx->chain->flags & NFT_BASE_CHAIN) { | |
450 | const struct nft_base_chain *basechain = | |
451 | nft_base_chain(ctx->chain); | |
115a60b1 | 452 | const struct nf_hook_ops *ops = &basechain->ops[0]; |
0ca743a5 PNA |
453 | |
454 | hook_mask = 1 << ops->hooknum; | |
455 | if (hook_mask & match->hooks) | |
456 | return 0; | |
457 | ||
458 | /* This match is being called from an invalid chain */ | |
459 | return -EINVAL; | |
460 | } | |
461 | return 0; | |
462 | } | |
463 | ||
464 | static int | |
465 | nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, | |
466 | int event, u16 family, const char *name, | |
467 | int rev, int target) | |
468 | { | |
469 | struct nlmsghdr *nlh; | |
470 | struct nfgenmsg *nfmsg; | |
471 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
472 | ||
473 | event |= NFNL_SUBSYS_NFT_COMPAT << 8; | |
474 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); | |
475 | if (nlh == NULL) | |
476 | goto nlmsg_failure; | |
477 | ||
478 | nfmsg = nlmsg_data(nlh); | |
479 | nfmsg->nfgen_family = family; | |
480 | nfmsg->version = NFNETLINK_V0; | |
481 | nfmsg->res_id = 0; | |
482 | ||
483 | if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || | |
484 | nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || | |
485 | nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) | |
486 | goto nla_put_failure; | |
487 | ||
488 | nlmsg_end(skb, nlh); | |
489 | return skb->len; | |
490 | ||
491 | nlmsg_failure: | |
492 | nla_put_failure: | |
493 | nlmsg_cancel(skb, nlh); | |
494 | return -1; | |
495 | } | |
496 | ||
497 | static int | |
498 | nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb, | |
499 | const struct nlmsghdr *nlh, const struct nlattr * const tb[]) | |
500 | { | |
501 | int ret = 0, target; | |
502 | struct nfgenmsg *nfmsg; | |
503 | const char *fmt; | |
504 | const char *name; | |
505 | u32 rev; | |
506 | struct sk_buff *skb2; | |
507 | ||
508 | if (tb[NFTA_COMPAT_NAME] == NULL || | |
509 | tb[NFTA_COMPAT_REV] == NULL || | |
510 | tb[NFTA_COMPAT_TYPE] == NULL) | |
511 | return -EINVAL; | |
512 | ||
513 | name = nla_data(tb[NFTA_COMPAT_NAME]); | |
514 | rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); | |
515 | target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); | |
516 | ||
517 | nfmsg = nlmsg_data(nlh); | |
518 | ||
519 | switch(nfmsg->nfgen_family) { | |
520 | case AF_INET: | |
521 | fmt = "ipt_%s"; | |
522 | break; | |
523 | case AF_INET6: | |
524 | fmt = "ip6t_%s"; | |
525 | break; | |
526 | default: | |
527 | pr_err("nft_compat: unsupported protocol %d\n", | |
528 | nfmsg->nfgen_family); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, | |
533 | rev, target, &ret), | |
534 | fmt, name); | |
535 | ||
536 | if (ret < 0) | |
537 | return ret; | |
538 | ||
539 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
540 | if (skb2 == NULL) | |
541 | return -ENOMEM; | |
542 | ||
543 | /* include the best revision for this extension in the message */ | |
544 | if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, | |
545 | nlh->nlmsg_seq, | |
546 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
547 | NFNL_MSG_COMPAT_GET, | |
548 | nfmsg->nfgen_family, | |
549 | name, ret, target) <= 0) { | |
550 | kfree_skb(skb2); | |
551 | return -ENOSPC; | |
552 | } | |
553 | ||
554 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, | |
555 | MSG_DONTWAIT); | |
556 | if (ret > 0) | |
557 | ret = 0; | |
558 | ||
559 | return ret == -EAGAIN ? -ENOBUFS : ret; | |
560 | } | |
561 | ||
562 | static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { | |
563 | [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, | |
564 | .len = NFT_COMPAT_NAME_MAX-1 }, | |
565 | [NFTA_COMPAT_REV] = { .type = NLA_U32 }, | |
566 | [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, | |
567 | }; | |
568 | ||
569 | static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { | |
570 | [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get, | |
571 | .attr_count = NFTA_COMPAT_MAX, | |
572 | .policy = nfnl_compat_policy_get }, | |
573 | }; | |
574 | ||
575 | static const struct nfnetlink_subsystem nfnl_compat_subsys = { | |
576 | .name = "nft-compat", | |
577 | .subsys_id = NFNL_SUBSYS_NFT_COMPAT, | |
578 | .cb_count = NFNL_MSG_COMPAT_MAX, | |
579 | .cb = nfnl_nft_compat_cb, | |
580 | }; | |
581 | ||
582 | static LIST_HEAD(nft_match_list); | |
583 | ||
584 | struct nft_xt { | |
585 | struct list_head head; | |
586 | struct nft_expr_ops ops; | |
587 | }; | |
588 | ||
589 | static struct nft_expr_type nft_match_type; | |
590 | ||
591 | static const struct nft_expr_ops * | |
592 | nft_match_select_ops(const struct nft_ctx *ctx, | |
593 | const struct nlattr * const tb[]) | |
594 | { | |
595 | struct nft_xt *nft_match; | |
596 | struct xt_match *match; | |
597 | char *mt_name; | |
598 | __u32 rev, family; | |
599 | ||
600 | if (tb[NFTA_MATCH_NAME] == NULL || | |
601 | tb[NFTA_MATCH_REV] == NULL || | |
602 | tb[NFTA_MATCH_INFO] == NULL) | |
603 | return ERR_PTR(-EINVAL); | |
604 | ||
605 | mt_name = nla_data(tb[NFTA_MATCH_NAME]); | |
606 | rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); | |
607 | family = ctx->afi->family; | |
608 | ||
609 | /* Re-use the existing match if it's already loaded. */ | |
610 | list_for_each_entry(nft_match, &nft_match_list, head) { | |
611 | struct xt_match *match = nft_match->ops.data; | |
612 | ||
613 | if (strcmp(match->name, mt_name) == 0 && | |
614 | match->revision == rev && match->family == family) | |
615 | return &nft_match->ops; | |
616 | } | |
617 | ||
618 | match = xt_request_find_match(family, mt_name, rev); | |
619 | if (IS_ERR(match)) | |
620 | return ERR_PTR(-ENOENT); | |
621 | ||
622 | /* This is the first time we use this match, allocate operations */ | |
623 | nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
624 | if (nft_match == NULL) | |
625 | return ERR_PTR(-ENOMEM); | |
626 | ||
627 | nft_match->ops.type = &nft_match_type; | |
628 | nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize) + | |
629 | nft_compat_match_offset(match)); | |
630 | nft_match->ops.eval = nft_match_eval; | |
631 | nft_match->ops.init = nft_match_init; | |
632 | nft_match->ops.destroy = nft_match_destroy; | |
633 | nft_match->ops.dump = nft_match_dump; | |
634 | nft_match->ops.validate = nft_match_validate; | |
635 | nft_match->ops.data = match; | |
636 | ||
637 | list_add(&nft_match->head, &nft_match_list); | |
638 | ||
639 | return &nft_match->ops; | |
640 | } | |
641 | ||
642 | static void nft_match_release(void) | |
643 | { | |
c359c415 | 644 | struct nft_xt *nft_match, *tmp; |
0ca743a5 | 645 | |
c359c415 | 646 | list_for_each_entry_safe(nft_match, tmp, &nft_match_list, head) |
0ca743a5 PNA |
647 | kfree(nft_match); |
648 | } | |
649 | ||
650 | static struct nft_expr_type nft_match_type __read_mostly = { | |
651 | .name = "match", | |
652 | .select_ops = nft_match_select_ops, | |
653 | .policy = nft_match_policy, | |
654 | .maxattr = NFTA_MATCH_MAX, | |
655 | .owner = THIS_MODULE, | |
656 | }; | |
657 | ||
658 | static LIST_HEAD(nft_target_list); | |
659 | ||
660 | static struct nft_expr_type nft_target_type; | |
661 | ||
662 | static const struct nft_expr_ops * | |
663 | nft_target_select_ops(const struct nft_ctx *ctx, | |
664 | const struct nlattr * const tb[]) | |
665 | { | |
666 | struct nft_xt *nft_target; | |
667 | struct xt_target *target; | |
668 | char *tg_name; | |
669 | __u32 rev, family; | |
670 | ||
671 | if (tb[NFTA_TARGET_NAME] == NULL || | |
672 | tb[NFTA_TARGET_REV] == NULL || | |
673 | tb[NFTA_TARGET_INFO] == NULL) | |
674 | return ERR_PTR(-EINVAL); | |
675 | ||
676 | tg_name = nla_data(tb[NFTA_TARGET_NAME]); | |
677 | rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); | |
678 | family = ctx->afi->family; | |
679 | ||
680 | /* Re-use the existing target if it's already loaded. */ | |
681 | list_for_each_entry(nft_target, &nft_match_list, head) { | |
682 | struct xt_target *target = nft_target->ops.data; | |
683 | ||
684 | if (strcmp(target->name, tg_name) == 0 && | |
685 | target->revision == rev && target->family == family) | |
686 | return &nft_target->ops; | |
687 | } | |
688 | ||
689 | target = xt_request_find_target(family, tg_name, rev); | |
690 | if (IS_ERR(target)) | |
691 | return ERR_PTR(-ENOENT); | |
692 | ||
693 | /* This is the first time we use this target, allocate operations */ | |
694 | nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); | |
695 | if (nft_target == NULL) | |
696 | return ERR_PTR(-ENOMEM); | |
697 | ||
698 | nft_target->ops.type = &nft_target_type; | |
699 | nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize) + | |
700 | nft_compat_target_offset(target)); | |
701 | nft_target->ops.eval = nft_target_eval; | |
702 | nft_target->ops.init = nft_target_init; | |
703 | nft_target->ops.destroy = nft_target_destroy; | |
704 | nft_target->ops.dump = nft_target_dump; | |
705 | nft_target->ops.validate = nft_target_validate; | |
706 | nft_target->ops.data = target; | |
707 | ||
708 | list_add(&nft_target->head, &nft_target_list); | |
709 | ||
710 | return &nft_target->ops; | |
711 | } | |
712 | ||
713 | static void nft_target_release(void) | |
714 | { | |
c359c415 | 715 | struct nft_xt *nft_target, *tmp; |
0ca743a5 | 716 | |
c359c415 | 717 | list_for_each_entry_safe(nft_target, tmp, &nft_target_list, head) |
0ca743a5 PNA |
718 | kfree(nft_target); |
719 | } | |
720 | ||
721 | static struct nft_expr_type nft_target_type __read_mostly = { | |
722 | .name = "target", | |
723 | .select_ops = nft_target_select_ops, | |
724 | .policy = nft_target_policy, | |
725 | .maxattr = NFTA_TARGET_MAX, | |
726 | .owner = THIS_MODULE, | |
727 | }; | |
728 | ||
729 | static int __init nft_compat_module_init(void) | |
730 | { | |
731 | int ret; | |
732 | ||
733 | ret = nft_register_expr(&nft_match_type); | |
734 | if (ret < 0) | |
735 | return ret; | |
736 | ||
737 | ret = nft_register_expr(&nft_target_type); | |
738 | if (ret < 0) | |
739 | goto err_match; | |
740 | ||
741 | ret = nfnetlink_subsys_register(&nfnl_compat_subsys); | |
742 | if (ret < 0) { | |
743 | pr_err("nft_compat: cannot register with nfnetlink.\n"); | |
744 | goto err_target; | |
745 | } | |
746 | ||
747 | pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"); | |
748 | ||
749 | return ret; | |
750 | ||
751 | err_target: | |
752 | nft_unregister_expr(&nft_target_type); | |
753 | err_match: | |
754 | nft_unregister_expr(&nft_match_type); | |
755 | return ret; | |
756 | } | |
757 | ||
758 | static void __exit nft_compat_module_exit(void) | |
759 | { | |
760 | nfnetlink_subsys_unregister(&nfnl_compat_subsys); | |
761 | nft_unregister_expr(&nft_target_type); | |
762 | nft_unregister_expr(&nft_match_type); | |
763 | nft_match_release(); | |
764 | nft_target_release(); | |
765 | } | |
766 | ||
767 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); | |
768 | ||
769 | module_init(nft_compat_module_init); | |
770 | module_exit(nft_compat_module_exit); | |
771 | ||
772 | MODULE_LICENSE("GPL"); | |
773 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
774 | MODULE_ALIAS_NFT_EXPR("match"); | |
775 | MODULE_ALIAS_NFT_EXPR("target"); |