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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
0ca743a5 PNA |
2 | /* |
3 | * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org> | |
4 | * | |
0ca743a5 PNA |
5 | * This software has been sponsored by Sophos Astaro <http://www.sophos.com> |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netlink.h> | |
12 | #include <linux/netfilter.h> | |
13 | #include <linux/netfilter/nfnetlink.h> | |
14 | #include <linux/netfilter/nf_tables.h> | |
15 | #include <linux/netfilter/nf_tables_compat.h> | |
16 | #include <linux/netfilter/x_tables.h> | |
17 | #include <linux/netfilter_ipv4/ip_tables.h> | |
18 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
5191f4d8 | 19 | #include <linux/netfilter_bridge/ebtables.h> |
5f158939 | 20 | #include <linux/netfilter_arp/arp_tables.h> |
0ca743a5 | 21 | #include <net/netfilter/nf_tables.h> |
4b512e1c | 22 | |
732a8049 FW |
23 | /* Used for matches where *info is larger than X byte */ |
24 | #define NFT_MATCH_LARGE_THRESH 192 | |
25 | ||
26 | struct nft_xt_match_priv { | |
27 | void *info; | |
28 | }; | |
29 | ||
e4844c9c FW |
30 | static int nft_compat_chain_validate_dependency(const struct nft_ctx *ctx, |
31 | const char *tablename) | |
f3f5dded | 32 | { |
e4844c9c FW |
33 | enum nft_chain_types type = NFT_CHAIN_T_DEFAULT; |
34 | const struct nft_chain *chain = ctx->chain; | |
f3f5dded PNA |
35 | const struct nft_base_chain *basechain; |
36 | ||
f323d954 PNA |
37 | if (!tablename || |
38 | !nft_is_base_chain(chain)) | |
f3f5dded PNA |
39 | return 0; |
40 | ||
f3f5dded | 41 | basechain = nft_base_chain(chain); |
e4844c9c FW |
42 | if (strcmp(tablename, "nat") == 0) { |
43 | if (ctx->family != NFPROTO_BRIDGE) | |
44 | type = NFT_CHAIN_T_NAT; | |
45 | if (basechain->type->type != type) | |
46 | return -EINVAL; | |
47 | } | |
f3f5dded PNA |
48 | |
49 | return 0; | |
50 | } | |
51 | ||
0ca743a5 PNA |
52 | union nft_entry { |
53 | struct ipt_entry e4; | |
54 | struct ip6t_entry e6; | |
5191f4d8 | 55 | struct ebt_entry ebt; |
5f158939 | 56 | struct arpt_entry arp; |
0ca743a5 PNA |
57 | }; |
58 | ||
59 | static inline void | |
60 | nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info) | |
61 | { | |
62 | par->target = xt; | |
63 | par->targinfo = xt_info; | |
64 | par->hotdrop = false; | |
65 | } | |
66 | ||
5191f4d8 | 67 | static void nft_target_eval_xt(const struct nft_expr *expr, |
a55e22e9 | 68 | struct nft_regs *regs, |
5191f4d8 | 69 | const struct nft_pktinfo *pkt) |
0ca743a5 PNA |
70 | { |
71 | void *info = nft_expr_priv(expr); | |
72 | struct xt_target *target = expr->ops->data; | |
73 | struct sk_buff *skb = pkt->skb; | |
74 | int ret; | |
75 | ||
76 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
77 | ||
78 | ret = target->target(skb, &pkt->xt); | |
79 | ||
80 | if (pkt->xt.hotdrop) | |
81 | ret = NF_DROP; | |
82 | ||
5191f4d8 | 83 | switch (ret) { |
0ca743a5 | 84 | case XT_CONTINUE: |
a55e22e9 | 85 | regs->verdict.code = NFT_CONTINUE; |
0ca743a5 PNA |
86 | break; |
87 | default: | |
a55e22e9 | 88 | regs->verdict.code = ret; |
0ca743a5 PNA |
89 | break; |
90 | } | |
5191f4d8 AB |
91 | } |
92 | ||
93 | static void nft_target_eval_bridge(const struct nft_expr *expr, | |
a55e22e9 | 94 | struct nft_regs *regs, |
5191f4d8 AB |
95 | const struct nft_pktinfo *pkt) |
96 | { | |
97 | void *info = nft_expr_priv(expr); | |
98 | struct xt_target *target = expr->ops->data; | |
99 | struct sk_buff *skb = pkt->skb; | |
100 | int ret; | |
101 | ||
102 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info); | |
103 | ||
104 | ret = target->target(skb, &pkt->xt); | |
105 | ||
106 | if (pkt->xt.hotdrop) | |
107 | ret = NF_DROP; | |
108 | ||
109 | switch (ret) { | |
110 | case EBT_ACCEPT: | |
a55e22e9 | 111 | regs->verdict.code = NF_ACCEPT; |
5191f4d8 AB |
112 | break; |
113 | case EBT_DROP: | |
a55e22e9 | 114 | regs->verdict.code = NF_DROP; |
5191f4d8 AB |
115 | break; |
116 | case EBT_CONTINUE: | |
a55e22e9 | 117 | regs->verdict.code = NFT_CONTINUE; |
5191f4d8 AB |
118 | break; |
119 | case EBT_RETURN: | |
a55e22e9 | 120 | regs->verdict.code = NFT_RETURN; |
5191f4d8 AB |
121 | break; |
122 | default: | |
a55e22e9 | 123 | regs->verdict.code = ret; |
5191f4d8 AB |
124 | break; |
125 | } | |
0ca743a5 PNA |
126 | } |
127 | ||
128 | static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = { | |
129 | [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING }, | |
130 | [NFTA_TARGET_REV] = { .type = NLA_U32 }, | |
131 | [NFTA_TARGET_INFO] = { .type = NLA_BINARY }, | |
132 | }; | |
133 | ||
134 | static void | |
135 | nft_target_set_tgchk_param(struct xt_tgchk_param *par, | |
136 | const struct nft_ctx *ctx, | |
137 | struct xt_target *target, void *info, | |
2156d321 | 138 | union nft_entry *entry, u16 proto, bool inv) |
0ca743a5 | 139 | { |
2daf1b4d | 140 | par->net = ctx->net; |
0ca743a5 | 141 | par->table = ctx->table->name; |
36596dad | 142 | switch (ctx->family) { |
0ca743a5 PNA |
143 | case AF_INET: |
144 | entry->e4.ip.proto = proto; | |
145 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
146 | break; | |
147 | case AF_INET6: | |
749177cc PNA |
148 | if (proto) |
149 | entry->e6.ipv6.flags |= IP6T_F_PROTO; | |
150 | ||
0ca743a5 PNA |
151 | entry->e6.ipv6.proto = proto; |
152 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
153 | break; | |
5191f4d8 | 154 | case NFPROTO_BRIDGE: |
2156d321 | 155 | entry->ebt.ethproto = (__force __be16)proto; |
5191f4d8 AB |
156 | entry->ebt.invflags = inv ? EBT_IPROTO : 0; |
157 | break; | |
5f158939 AB |
158 | case NFPROTO_ARP: |
159 | break; | |
0ca743a5 PNA |
160 | } |
161 | par->entryinfo = entry; | |
162 | par->target = target; | |
163 | par->targinfo = info; | |
f323d954 | 164 | if (nft_is_base_chain(ctx->chain)) { |
0ca743a5 PNA |
165 | const struct nft_base_chain *basechain = |
166 | nft_base_chain(ctx->chain); | |
c974a3a3 | 167 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
168 | |
169 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
170 | } else { |
171 | par->hook_mask = 0; | |
0ca743a5 | 172 | } |
36596dad | 173 | par->family = ctx->family; |
55917a21 | 174 | par->nft_compat = true; |
0ca743a5 PNA |
175 | } |
176 | ||
177 | static void target_compat_from_user(struct xt_target *t, void *in, void *out) | |
178 | { | |
756c1b1a | 179 | int pad; |
0ca743a5 | 180 | |
756c1b1a PNA |
181 | memcpy(out, in, t->targetsize); |
182 | pad = XT_ALIGN(t->targetsize) - t->targetsize; | |
183 | if (pad > 0) | |
184 | memset(out + t->targetsize, 0, pad); | |
0ca743a5 PNA |
185 | } |
186 | ||
187 | static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = { | |
188 | [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 }, | |
189 | [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 }, | |
190 | }; | |
191 | ||
2156d321 | 192 | static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv) |
0ca743a5 PNA |
193 | { |
194 | struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1]; | |
195 | u32 flags; | |
196 | int err; | |
197 | ||
8cb08174 JB |
198 | err = nla_parse_nested_deprecated(tb, NFTA_RULE_COMPAT_MAX, attr, |
199 | nft_rule_compat_policy, NULL); | |
0ca743a5 PNA |
200 | if (err < 0) |
201 | return err; | |
202 | ||
203 | if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS]) | |
204 | return -EINVAL; | |
205 | ||
206 | flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS])); | |
207 | if (flags & ~NFT_RULE_COMPAT_F_MASK) | |
208 | return -EINVAL; | |
209 | if (flags & NFT_RULE_COMPAT_F_INV) | |
210 | *inv = true; | |
211 | ||
8691a9a3 PNA |
212 | *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO])); |
213 | return 0; | |
0ca743a5 PNA |
214 | } |
215 | ||
216 | static int | |
217 | nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
218 | const struct nlattr * const tb[]) | |
219 | { | |
220 | void *info = nft_expr_priv(expr); | |
221 | struct xt_target *target = expr->ops->data; | |
222 | struct xt_tgchk_param par; | |
223 | size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO])); | |
2156d321 | 224 | u16 proto = 0; |
0ca743a5 PNA |
225 | bool inv = false; |
226 | union nft_entry e = {}; | |
227 | int ret; | |
228 | ||
229 | target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info); | |
230 | ||
8691a9a3 PNA |
231 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
232 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
233 | if (ret < 0) | |
b8e9dc1c | 234 | return ret; |
8691a9a3 | 235 | } |
0ca743a5 PNA |
236 | |
237 | nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv); | |
238 | ||
239 | ret = xt_check_target(&par, size, proto, inv); | |
240 | if (ret < 0) | |
b8e9dc1c | 241 | return ret; |
0ca743a5 PNA |
242 | |
243 | /* The standard target cannot be used */ | |
b8e9dc1c FW |
244 | if (!target->target) |
245 | return -EINVAL; | |
0ca743a5 PNA |
246 | |
247 | return 0; | |
0ca743a5 PNA |
248 | } |
249 | ||
250 | static void | |
62472bce | 251 | nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) |
0ca743a5 PNA |
252 | { |
253 | struct xt_target *target = expr->ops->data; | |
3d9b1421 | 254 | void *info = nft_expr_priv(expr); |
753c111f | 255 | struct module *me = target->me; |
3d9b1421 PNA |
256 | struct xt_tgdtor_param par; |
257 | ||
258 | par.net = ctx->net; | |
259 | par.target = target; | |
260 | par.targinfo = info; | |
36596dad | 261 | par.family = ctx->family; |
3d9b1421 PNA |
262 | if (par.target->destroy != NULL) |
263 | par.target->destroy(&par); | |
0ca743a5 | 264 | |
b8e20400 PNA |
265 | module_put(me); |
266 | kfree(expr->ops); | |
0ca743a5 PNA |
267 | } |
268 | ||
d701d811 PNA |
269 | static int nft_extension_dump_info(struct sk_buff *skb, int attr, |
270 | const void *info, | |
271 | unsigned int size, unsigned int user_size) | |
272 | { | |
273 | unsigned int info_size, aligned_size = XT_ALIGN(size); | |
274 | struct nlattr *nla; | |
275 | ||
276 | nla = nla_reserve(skb, attr, aligned_size); | |
277 | if (!nla) | |
278 | return -1; | |
279 | ||
280 | info_size = user_size ? : size; | |
281 | memcpy(nla_data(nla), info, info_size); | |
282 | memset(nla_data(nla) + info_size, 0, aligned_size - info_size); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
0ca743a5 PNA |
287 | static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr) |
288 | { | |
289 | const struct xt_target *target = expr->ops->data; | |
290 | void *info = nft_expr_priv(expr); | |
291 | ||
292 | if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) || | |
293 | nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) || | |
d701d811 PNA |
294 | nft_extension_dump_info(skb, NFTA_TARGET_INFO, info, |
295 | target->targetsize, target->usersize)) | |
0ca743a5 PNA |
296 | goto nla_put_failure; |
297 | ||
298 | return 0; | |
299 | ||
300 | nla_put_failure: | |
301 | return -1; | |
302 | } | |
303 | ||
304 | static int nft_target_validate(const struct nft_ctx *ctx, | |
305 | const struct nft_expr *expr, | |
306 | const struct nft_data **data) | |
307 | { | |
308 | struct xt_target *target = expr->ops->data; | |
309 | unsigned int hook_mask = 0; | |
f3f5dded | 310 | int ret; |
0ca743a5 | 311 | |
f323d954 | 312 | if (nft_is_base_chain(ctx->chain)) { |
0ca743a5 PNA |
313 | const struct nft_base_chain *basechain = |
314 | nft_base_chain(ctx->chain); | |
c974a3a3 | 315 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
316 | |
317 | hook_mask = 1 << ops->hooknum; | |
f7fb77fc | 318 | if (target->hooks && !(hook_mask & target->hooks)) |
f3f5dded | 319 | return -EINVAL; |
0ca743a5 | 320 | |
e4844c9c | 321 | ret = nft_compat_chain_validate_dependency(ctx, target->table); |
f3f5dded PNA |
322 | if (ret < 0) |
323 | return ret; | |
0ca743a5 PNA |
324 | } |
325 | return 0; | |
326 | } | |
327 | ||
8bdf1647 FW |
328 | static void __nft_match_eval(const struct nft_expr *expr, |
329 | struct nft_regs *regs, | |
330 | const struct nft_pktinfo *pkt, | |
331 | void *info) | |
0ca743a5 | 332 | { |
0ca743a5 PNA |
333 | struct xt_match *match = expr->ops->data; |
334 | struct sk_buff *skb = pkt->skb; | |
335 | bool ret; | |
336 | ||
337 | nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info); | |
338 | ||
339 | ret = match->match(skb, (struct xt_action_param *)&pkt->xt); | |
340 | ||
341 | if (pkt->xt.hotdrop) { | |
a55e22e9 | 342 | regs->verdict.code = NF_DROP; |
0ca743a5 PNA |
343 | return; |
344 | } | |
345 | ||
c1f86676 DM |
346 | switch (ret ? 1 : 0) { |
347 | case 1: | |
a55e22e9 | 348 | regs->verdict.code = NFT_CONTINUE; |
0ca743a5 | 349 | break; |
c1f86676 | 350 | case 0: |
a55e22e9 | 351 | regs->verdict.code = NFT_BREAK; |
0ca743a5 PNA |
352 | break; |
353 | } | |
354 | } | |
355 | ||
732a8049 FW |
356 | static void nft_match_large_eval(const struct nft_expr *expr, |
357 | struct nft_regs *regs, | |
358 | const struct nft_pktinfo *pkt) | |
359 | { | |
360 | struct nft_xt_match_priv *priv = nft_expr_priv(expr); | |
361 | ||
362 | __nft_match_eval(expr, regs, pkt, priv->info); | |
363 | } | |
364 | ||
8bdf1647 FW |
365 | static void nft_match_eval(const struct nft_expr *expr, |
366 | struct nft_regs *regs, | |
367 | const struct nft_pktinfo *pkt) | |
368 | { | |
369 | __nft_match_eval(expr, regs, pkt, nft_expr_priv(expr)); | |
370 | } | |
371 | ||
0ca743a5 PNA |
372 | static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = { |
373 | [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING }, | |
374 | [NFTA_MATCH_REV] = { .type = NLA_U32 }, | |
375 | [NFTA_MATCH_INFO] = { .type = NLA_BINARY }, | |
376 | }; | |
377 | ||
378 | /* struct xt_mtchk_param and xt_tgchk_param look very similar */ | |
379 | static void | |
380 | nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx, | |
381 | struct xt_match *match, void *info, | |
2156d321 | 382 | union nft_entry *entry, u16 proto, bool inv) |
0ca743a5 | 383 | { |
2daf1b4d | 384 | par->net = ctx->net; |
0ca743a5 | 385 | par->table = ctx->table->name; |
36596dad | 386 | switch (ctx->family) { |
0ca743a5 PNA |
387 | case AF_INET: |
388 | entry->e4.ip.proto = proto; | |
389 | entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0; | |
390 | break; | |
391 | case AF_INET6: | |
749177cc PNA |
392 | if (proto) |
393 | entry->e6.ipv6.flags |= IP6T_F_PROTO; | |
394 | ||
0ca743a5 PNA |
395 | entry->e6.ipv6.proto = proto; |
396 | entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0; | |
397 | break; | |
5191f4d8 | 398 | case NFPROTO_BRIDGE: |
2156d321 | 399 | entry->ebt.ethproto = (__force __be16)proto; |
5191f4d8 AB |
400 | entry->ebt.invflags = inv ? EBT_IPROTO : 0; |
401 | break; | |
5f158939 AB |
402 | case NFPROTO_ARP: |
403 | break; | |
0ca743a5 PNA |
404 | } |
405 | par->entryinfo = entry; | |
406 | par->match = match; | |
407 | par->matchinfo = info; | |
f323d954 | 408 | if (nft_is_base_chain(ctx->chain)) { |
0ca743a5 PNA |
409 | const struct nft_base_chain *basechain = |
410 | nft_base_chain(ctx->chain); | |
c974a3a3 | 411 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
412 | |
413 | par->hook_mask = 1 << ops->hooknum; | |
493618a9 PNA |
414 | } else { |
415 | par->hook_mask = 0; | |
0ca743a5 | 416 | } |
36596dad | 417 | par->family = ctx->family; |
55917a21 | 418 | par->nft_compat = true; |
0ca743a5 PNA |
419 | } |
420 | ||
421 | static void match_compat_from_user(struct xt_match *m, void *in, void *out) | |
422 | { | |
756c1b1a PNA |
423 | int pad; |
424 | ||
425 | memcpy(out, in, m->matchsize); | |
426 | pad = XT_ALIGN(m->matchsize) - m->matchsize; | |
427 | if (pad > 0) | |
428 | memset(out + m->matchsize, 0, pad); | |
0ca743a5 PNA |
429 | } |
430 | ||
431 | static int | |
8bdf1647 FW |
432 | __nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, |
433 | const struct nlattr * const tb[], | |
434 | void *info) | |
0ca743a5 | 435 | { |
0ca743a5 PNA |
436 | struct xt_match *match = expr->ops->data; |
437 | struct xt_mtchk_param par; | |
438 | size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO])); | |
2156d321 | 439 | u16 proto = 0; |
0ca743a5 PNA |
440 | bool inv = false; |
441 | union nft_entry e = {}; | |
442 | int ret; | |
443 | ||
444 | match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info); | |
445 | ||
8691a9a3 PNA |
446 | if (ctx->nla[NFTA_RULE_COMPAT]) { |
447 | ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv); | |
448 | if (ret < 0) | |
b8e9dc1c | 449 | return ret; |
8691a9a3 | 450 | } |
0ca743a5 PNA |
451 | |
452 | nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv); | |
453 | ||
b8e20400 | 454 | return xt_check_match(&par, size, proto, inv); |
0ca743a5 PNA |
455 | } |
456 | ||
8bdf1647 FW |
457 | static int |
458 | nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
459 | const struct nlattr * const tb[]) | |
460 | { | |
461 | return __nft_match_init(ctx, expr, tb, nft_expr_priv(expr)); | |
462 | } | |
463 | ||
732a8049 FW |
464 | static int |
465 | nft_match_large_init(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
466 | const struct nlattr * const tb[]) | |
467 | { | |
468 | struct nft_xt_match_priv *priv = nft_expr_priv(expr); | |
469 | struct xt_match *m = expr->ops->data; | |
470 | int ret; | |
471 | ||
472 | priv->info = kmalloc(XT_ALIGN(m->matchsize), GFP_KERNEL); | |
473 | if (!priv->info) | |
474 | return -ENOMEM; | |
475 | ||
476 | ret = __nft_match_init(ctx, expr, tb, priv->info); | |
477 | if (ret) | |
478 | kfree(priv->info); | |
479 | return ret; | |
480 | } | |
481 | ||
0ca743a5 | 482 | static void |
8bdf1647 FW |
483 | __nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr, |
484 | void *info) | |
0ca743a5 PNA |
485 | { |
486 | struct xt_match *match = expr->ops->data; | |
29e38801 | 487 | struct module *me = match->me; |
3d9b1421 PNA |
488 | struct xt_mtdtor_param par; |
489 | ||
490 | par.net = ctx->net; | |
491 | par.match = match; | |
492 | par.matchinfo = info; | |
36596dad | 493 | par.family = ctx->family; |
3d9b1421 PNA |
494 | if (par.match->destroy != NULL) |
495 | par.match->destroy(&par); | |
0ca743a5 | 496 | |
b8e20400 PNA |
497 | module_put(me); |
498 | kfree(expr->ops); | |
0ca743a5 PNA |
499 | } |
500 | ||
8bdf1647 FW |
501 | static void |
502 | nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) | |
503 | { | |
504 | __nft_match_destroy(ctx, expr, nft_expr_priv(expr)); | |
505 | } | |
506 | ||
732a8049 FW |
507 | static void |
508 | nft_match_large_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) | |
509 | { | |
510 | struct nft_xt_match_priv *priv = nft_expr_priv(expr); | |
511 | ||
512 | __nft_match_destroy(ctx, expr, priv->info); | |
513 | kfree(priv->info); | |
514 | } | |
515 | ||
8bdf1647 FW |
516 | static int __nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr, |
517 | void *info) | |
0ca743a5 | 518 | { |
0ca743a5 PNA |
519 | struct xt_match *match = expr->ops->data; |
520 | ||
521 | if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) || | |
522 | nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) || | |
d701d811 PNA |
523 | nft_extension_dump_info(skb, NFTA_MATCH_INFO, info, |
524 | match->matchsize, match->usersize)) | |
0ca743a5 PNA |
525 | goto nla_put_failure; |
526 | ||
527 | return 0; | |
528 | ||
529 | nla_put_failure: | |
530 | return -1; | |
531 | } | |
532 | ||
8bdf1647 FW |
533 | static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr) |
534 | { | |
535 | return __nft_match_dump(skb, expr, nft_expr_priv(expr)); | |
536 | } | |
537 | ||
732a8049 FW |
538 | static int nft_match_large_dump(struct sk_buff *skb, const struct nft_expr *e) |
539 | { | |
540 | struct nft_xt_match_priv *priv = nft_expr_priv(e); | |
541 | ||
542 | return __nft_match_dump(skb, e, priv->info); | |
543 | } | |
544 | ||
0ca743a5 PNA |
545 | static int nft_match_validate(const struct nft_ctx *ctx, |
546 | const struct nft_expr *expr, | |
547 | const struct nft_data **data) | |
548 | { | |
549 | struct xt_match *match = expr->ops->data; | |
550 | unsigned int hook_mask = 0; | |
f3f5dded | 551 | int ret; |
0ca743a5 | 552 | |
f323d954 | 553 | if (nft_is_base_chain(ctx->chain)) { |
0ca743a5 PNA |
554 | const struct nft_base_chain *basechain = |
555 | nft_base_chain(ctx->chain); | |
c974a3a3 | 556 | const struct nf_hook_ops *ops = &basechain->ops; |
0ca743a5 PNA |
557 | |
558 | hook_mask = 1 << ops->hooknum; | |
f7fb77fc | 559 | if (match->hooks && !(hook_mask & match->hooks)) |
f3f5dded | 560 | return -EINVAL; |
0ca743a5 | 561 | |
e4844c9c | 562 | ret = nft_compat_chain_validate_dependency(ctx, match->table); |
f3f5dded PNA |
563 | if (ret < 0) |
564 | return ret; | |
0ca743a5 PNA |
565 | } |
566 | return 0; | |
567 | } | |
568 | ||
569 | static int | |
570 | nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, | |
571 | int event, u16 family, const char *name, | |
572 | int rev, int target) | |
573 | { | |
574 | struct nlmsghdr *nlh; | |
575 | struct nfgenmsg *nfmsg; | |
576 | unsigned int flags = portid ? NLM_F_MULTI : 0; | |
577 | ||
dedb67c4 | 578 | event = nfnl_msg_type(NFNL_SUBSYS_NFT_COMPAT, event); |
0ca743a5 PNA |
579 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags); |
580 | if (nlh == NULL) | |
581 | goto nlmsg_failure; | |
582 | ||
583 | nfmsg = nlmsg_data(nlh); | |
584 | nfmsg->nfgen_family = family; | |
585 | nfmsg->version = NFNETLINK_V0; | |
586 | nfmsg->res_id = 0; | |
587 | ||
588 | if (nla_put_string(skb, NFTA_COMPAT_NAME, name) || | |
589 | nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) || | |
590 | nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target))) | |
591 | goto nla_put_failure; | |
592 | ||
593 | nlmsg_end(skb, nlh); | |
594 | return skb->len; | |
595 | ||
596 | nlmsg_failure: | |
597 | nla_put_failure: | |
598 | nlmsg_cancel(skb, nlh); | |
599 | return -1; | |
600 | } | |
601 | ||
eb1fb147 FW |
602 | static int nfnl_compat_get_rcu(struct net *net, struct sock *nfnl, |
603 | struct sk_buff *skb, const struct nlmsghdr *nlh, | |
604 | const struct nlattr * const tb[], | |
605 | struct netlink_ext_ack *extack) | |
0ca743a5 PNA |
606 | { |
607 | int ret = 0, target; | |
608 | struct nfgenmsg *nfmsg; | |
609 | const char *fmt; | |
610 | const char *name; | |
611 | u32 rev; | |
612 | struct sk_buff *skb2; | |
613 | ||
614 | if (tb[NFTA_COMPAT_NAME] == NULL || | |
615 | tb[NFTA_COMPAT_REV] == NULL || | |
616 | tb[NFTA_COMPAT_TYPE] == NULL) | |
617 | return -EINVAL; | |
618 | ||
619 | name = nla_data(tb[NFTA_COMPAT_NAME]); | |
620 | rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV])); | |
621 | target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE])); | |
622 | ||
623 | nfmsg = nlmsg_data(nlh); | |
624 | ||
625 | switch(nfmsg->nfgen_family) { | |
626 | case AF_INET: | |
627 | fmt = "ipt_%s"; | |
628 | break; | |
629 | case AF_INET6: | |
630 | fmt = "ip6t_%s"; | |
631 | break; | |
5191f4d8 AB |
632 | case NFPROTO_BRIDGE: |
633 | fmt = "ebt_%s"; | |
634 | break; | |
5f158939 AB |
635 | case NFPROTO_ARP: |
636 | fmt = "arpt_%s"; | |
637 | break; | |
0ca743a5 PNA |
638 | default: |
639 | pr_err("nft_compat: unsupported protocol %d\n", | |
640 | nfmsg->nfgen_family); | |
641 | return -EINVAL; | |
642 | } | |
643 | ||
eb1fb147 FW |
644 | if (!try_module_get(THIS_MODULE)) |
645 | return -EINVAL; | |
646 | ||
647 | rcu_read_unlock(); | |
0ca743a5 PNA |
648 | try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name, |
649 | rev, target, &ret), | |
650 | fmt, name); | |
0ca743a5 | 651 | if (ret < 0) |
eb1fb147 | 652 | goto out_put; |
0ca743a5 PNA |
653 | |
654 | skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
eb1fb147 FW |
655 | if (skb2 == NULL) { |
656 | ret = -ENOMEM; | |
657 | goto out_put; | |
658 | } | |
0ca743a5 PNA |
659 | |
660 | /* include the best revision for this extension in the message */ | |
661 | if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid, | |
662 | nlh->nlmsg_seq, | |
663 | NFNL_MSG_TYPE(nlh->nlmsg_type), | |
664 | NFNL_MSG_COMPAT_GET, | |
665 | nfmsg->nfgen_family, | |
666 | name, ret, target) <= 0) { | |
667 | kfree_skb(skb2); | |
eb1fb147 | 668 | goto out_put; |
0ca743a5 PNA |
669 | } |
670 | ||
671 | ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid, | |
672 | MSG_DONTWAIT); | |
673 | if (ret > 0) | |
674 | ret = 0; | |
eb1fb147 FW |
675 | out_put: |
676 | rcu_read_lock(); | |
677 | module_put(THIS_MODULE); | |
0ca743a5 PNA |
678 | return ret == -EAGAIN ? -ENOBUFS : ret; |
679 | } | |
680 | ||
681 | static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = { | |
682 | [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING, | |
683 | .len = NFT_COMPAT_NAME_MAX-1 }, | |
684 | [NFTA_COMPAT_REV] = { .type = NLA_U32 }, | |
685 | [NFTA_COMPAT_TYPE] = { .type = NLA_U32 }, | |
686 | }; | |
687 | ||
688 | static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = { | |
eb1fb147 | 689 | [NFNL_MSG_COMPAT_GET] = { .call_rcu = nfnl_compat_get_rcu, |
0ca743a5 PNA |
690 | .attr_count = NFTA_COMPAT_MAX, |
691 | .policy = nfnl_compat_policy_get }, | |
692 | }; | |
693 | ||
694 | static const struct nfnetlink_subsystem nfnl_compat_subsys = { | |
695 | .name = "nft-compat", | |
696 | .subsys_id = NFNL_SUBSYS_NFT_COMPAT, | |
697 | .cb_count = NFNL_MSG_COMPAT_MAX, | |
698 | .cb = nfnl_nft_compat_cb, | |
699 | }; | |
700 | ||
b8e20400 | 701 | static struct nft_expr_type nft_match_type; |
ba378ca9 | 702 | |
0ca743a5 PNA |
703 | static const struct nft_expr_ops * |
704 | nft_match_select_ops(const struct nft_ctx *ctx, | |
705 | const struct nlattr * const tb[]) | |
706 | { | |
b8e20400 | 707 | struct nft_expr_ops *ops; |
0ca743a5 | 708 | struct xt_match *match; |
732a8049 | 709 | unsigned int matchsize; |
0ca743a5 | 710 | char *mt_name; |
ba378ca9 | 711 | u32 rev, family; |
2bf4fade | 712 | int err; |
0ca743a5 PNA |
713 | |
714 | if (tb[NFTA_MATCH_NAME] == NULL || | |
715 | tb[NFTA_MATCH_REV] == NULL || | |
716 | tb[NFTA_MATCH_INFO] == NULL) | |
717 | return ERR_PTR(-EINVAL); | |
718 | ||
719 | mt_name = nla_data(tb[NFTA_MATCH_NAME]); | |
720 | rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV])); | |
36596dad | 721 | family = ctx->family; |
0ca743a5 | 722 | |
0ca743a5 PNA |
723 | match = xt_request_find_match(family, mt_name, rev); |
724 | if (IS_ERR(match)) | |
725 | return ERR_PTR(-ENOENT); | |
726 | ||
2bf4fade LZ |
727 | if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) { |
728 | err = -EINVAL; | |
729 | goto err; | |
730 | } | |
f0716cd6 | 731 | |
b8e20400 PNA |
732 | ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL); |
733 | if (!ops) { | |
2bf4fade LZ |
734 | err = -ENOMEM; |
735 | goto err; | |
736 | } | |
0ca743a5 | 737 | |
b8e20400 PNA |
738 | ops->type = &nft_match_type; |
739 | ops->eval = nft_match_eval; | |
740 | ops->init = nft_match_init; | |
741 | ops->destroy = nft_match_destroy; | |
742 | ops->dump = nft_match_dump; | |
743 | ops->validate = nft_match_validate; | |
744 | ops->data = match; | |
0ca743a5 | 745 | |
732a8049 FW |
746 | matchsize = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); |
747 | if (matchsize > NFT_MATCH_LARGE_THRESH) { | |
748 | matchsize = NFT_EXPR_SIZE(sizeof(struct nft_xt_match_priv)); | |
749 | ||
b8e20400 PNA |
750 | ops->eval = nft_match_large_eval; |
751 | ops->init = nft_match_large_init; | |
752 | ops->destroy = nft_match_large_destroy; | |
753 | ops->dump = nft_match_large_dump; | |
732a8049 FW |
754 | } |
755 | ||
b8e20400 | 756 | ops->size = matchsize; |
732a8049 | 757 | |
b8e20400 | 758 | return ops; |
2bf4fade LZ |
759 | err: |
760 | module_put(match->me); | |
761 | return ERR_PTR(err); | |
0ca743a5 PNA |
762 | } |
763 | ||
b8e20400 PNA |
764 | static void nft_match_release_ops(const struct nft_expr_ops *ops) |
765 | { | |
766 | struct xt_match *match = ops->data; | |
767 | ||
768 | module_put(match->me); | |
769 | kfree(ops); | |
770 | } | |
771 | ||
0ca743a5 PNA |
772 | static struct nft_expr_type nft_match_type __read_mostly = { |
773 | .name = "match", | |
774 | .select_ops = nft_match_select_ops, | |
b8e20400 | 775 | .release_ops = nft_match_release_ops, |
0ca743a5 PNA |
776 | .policy = nft_match_policy, |
777 | .maxattr = NFTA_MATCH_MAX, | |
778 | .owner = THIS_MODULE, | |
779 | }; | |
780 | ||
b8e20400 | 781 | static struct nft_expr_type nft_target_type; |
ba378ca9 | 782 | |
0ca743a5 PNA |
783 | static const struct nft_expr_ops * |
784 | nft_target_select_ops(const struct nft_ctx *ctx, | |
785 | const struct nlattr * const tb[]) | |
786 | { | |
b8e20400 | 787 | struct nft_expr_ops *ops; |
0ca743a5 PNA |
788 | struct xt_target *target; |
789 | char *tg_name; | |
ba378ca9 | 790 | u32 rev, family; |
2bf4fade | 791 | int err; |
0ca743a5 PNA |
792 | |
793 | if (tb[NFTA_TARGET_NAME] == NULL || | |
794 | tb[NFTA_TARGET_REV] == NULL || | |
795 | tb[NFTA_TARGET_INFO] == NULL) | |
796 | return ERR_PTR(-EINVAL); | |
797 | ||
798 | tg_name = nla_data(tb[NFTA_TARGET_NAME]); | |
799 | rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV])); | |
36596dad | 800 | family = ctx->family; |
0ca743a5 | 801 | |
21d5e078 FW |
802 | if (strcmp(tg_name, XT_ERROR_TARGET) == 0 || |
803 | strcmp(tg_name, XT_STANDARD_TARGET) == 0 || | |
804 | strcmp(tg_name, "standard") == 0) | |
805 | return ERR_PTR(-EINVAL); | |
806 | ||
0ca743a5 PNA |
807 | target = xt_request_find_target(family, tg_name, rev); |
808 | if (IS_ERR(target)) | |
809 | return ERR_PTR(-ENOENT); | |
810 | ||
21d5e078 FW |
811 | if (!target->target) { |
812 | err = -EINVAL; | |
813 | goto err; | |
814 | } | |
815 | ||
2bf4fade LZ |
816 | if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) { |
817 | err = -EINVAL; | |
818 | goto err; | |
819 | } | |
f0716cd6 | 820 | |
b8e20400 PNA |
821 | ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL); |
822 | if (!ops) { | |
2bf4fade LZ |
823 | err = -ENOMEM; |
824 | goto err; | |
825 | } | |
0ca743a5 | 826 | |
b8e20400 PNA |
827 | ops->type = &nft_target_type; |
828 | ops->size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); | |
829 | ops->init = nft_target_init; | |
830 | ops->destroy = nft_target_destroy; | |
831 | ops->dump = nft_target_dump; | |
832 | ops->validate = nft_target_validate; | |
833 | ops->data = target; | |
0ca743a5 | 834 | |
5191f4d8 | 835 | if (family == NFPROTO_BRIDGE) |
b8e20400 | 836 | ops->eval = nft_target_eval_bridge; |
5191f4d8 | 837 | else |
b8e20400 | 838 | ops->eval = nft_target_eval_xt; |
0ca743a5 | 839 | |
b8e20400 | 840 | return ops; |
2bf4fade LZ |
841 | err: |
842 | module_put(target->me); | |
843 | return ERR_PTR(err); | |
0ca743a5 PNA |
844 | } |
845 | ||
b8e20400 PNA |
846 | static void nft_target_release_ops(const struct nft_expr_ops *ops) |
847 | { | |
848 | struct xt_target *target = ops->data; | |
849 | ||
850 | module_put(target->me); | |
851 | kfree(ops); | |
852 | } | |
853 | ||
0ca743a5 PNA |
854 | static struct nft_expr_type nft_target_type __read_mostly = { |
855 | .name = "target", | |
856 | .select_ops = nft_target_select_ops, | |
b8e20400 | 857 | .release_ops = nft_target_release_ops, |
0ca743a5 PNA |
858 | .policy = nft_target_policy, |
859 | .maxattr = NFTA_TARGET_MAX, | |
860 | .owner = THIS_MODULE, | |
861 | }; | |
862 | ||
863 | static int __init nft_compat_module_init(void) | |
864 | { | |
865 | int ret; | |
866 | ||
867 | ret = nft_register_expr(&nft_match_type); | |
868 | if (ret < 0) | |
b8e20400 | 869 | return ret; |
0ca743a5 PNA |
870 | |
871 | ret = nft_register_expr(&nft_target_type); | |
872 | if (ret < 0) | |
873 | goto err_match; | |
874 | ||
875 | ret = nfnetlink_subsys_register(&nfnl_compat_subsys); | |
876 | if (ret < 0) { | |
877 | pr_err("nft_compat: cannot register with nfnetlink.\n"); | |
878 | goto err_target; | |
879 | } | |
880 | ||
0ca743a5 | 881 | return ret; |
0ca743a5 PNA |
882 | err_target: |
883 | nft_unregister_expr(&nft_target_type); | |
884 | err_match: | |
885 | nft_unregister_expr(&nft_match_type); | |
886 | return ret; | |
887 | } | |
888 | ||
889 | static void __exit nft_compat_module_exit(void) | |
890 | { | |
891 | nfnetlink_subsys_unregister(&nfnl_compat_subsys); | |
892 | nft_unregister_expr(&nft_target_type); | |
893 | nft_unregister_expr(&nft_match_type); | |
0ca743a5 PNA |
894 | } |
895 | ||
896 | MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT); | |
897 | ||
898 | module_init(nft_compat_module_init); | |
899 | module_exit(nft_compat_module_exit); | |
900 | ||
901 | MODULE_LICENSE("GPL"); | |
902 | MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>"); | |
903 | MODULE_ALIAS_NFT_EXPR("match"); | |
904 | MODULE_ALIAS_NFT_EXPR("target"); |