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96518518 | 1 | /* |
ef1f7df9 | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
96518518 PM |
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 | * Development of this code funded by Astaro AG (http://www.astaro.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/nf_tables.h> | |
e2a093ff AR |
17 | #include <linux/in.h> |
18 | #include <linux/ip.h> | |
19 | #include <linux/ipv6.h> | |
afc5be30 | 20 | #include <linux/smp.h> |
96518518 PM |
21 | #include <net/dst.h> |
22 | #include <net/sock.h> | |
23 | #include <net/tcp_states.h> /* for TCP_TIME_WAIT */ | |
24 | #include <net/netfilter/nf_tables.h> | |
aa45660c | 25 | #include <net/netfilter/nft_meta.h> |
96518518 | 26 | |
aa45660c TB |
27 | void nft_meta_get_eval(const struct nft_expr *expr, |
28 | struct nft_data data[NFT_REG_MAX + 1], | |
29 | const struct nft_pktinfo *pkt) | |
96518518 PM |
30 | { |
31 | const struct nft_meta *priv = nft_expr_priv(expr); | |
32 | const struct sk_buff *skb = pkt->skb; | |
33 | const struct net_device *in = pkt->in, *out = pkt->out; | |
34 | struct nft_data *dest = &data[priv->dreg]; | |
35 | ||
36 | switch (priv->key) { | |
37 | case NFT_META_LEN: | |
38 | dest->data[0] = skb->len; | |
39 | break; | |
40 | case NFT_META_PROTOCOL: | |
41 | *(__be16 *)dest->data = skb->protocol; | |
42 | break; | |
124edfa9 PM |
43 | case NFT_META_NFPROTO: |
44 | dest->data[0] = pkt->ops->pf; | |
45 | break; | |
4566bf27 PM |
46 | case NFT_META_L4PROTO: |
47 | dest->data[0] = pkt->tprot; | |
48 | break; | |
96518518 PM |
49 | case NFT_META_PRIORITY: |
50 | dest->data[0] = skb->priority; | |
51 | break; | |
52 | case NFT_META_MARK: | |
53 | dest->data[0] = skb->mark; | |
54 | break; | |
55 | case NFT_META_IIF: | |
56 | if (in == NULL) | |
57 | goto err; | |
58 | dest->data[0] = in->ifindex; | |
59 | break; | |
60 | case NFT_META_OIF: | |
61 | if (out == NULL) | |
62 | goto err; | |
63 | dest->data[0] = out->ifindex; | |
64 | break; | |
65 | case NFT_META_IIFNAME: | |
66 | if (in == NULL) | |
67 | goto err; | |
68 | strncpy((char *)dest->data, in->name, sizeof(dest->data)); | |
69 | break; | |
70 | case NFT_META_OIFNAME: | |
71 | if (out == NULL) | |
72 | goto err; | |
73 | strncpy((char *)dest->data, out->name, sizeof(dest->data)); | |
74 | break; | |
75 | case NFT_META_IIFTYPE: | |
76 | if (in == NULL) | |
77 | goto err; | |
78 | *(u16 *)dest->data = in->type; | |
79 | break; | |
80 | case NFT_META_OIFTYPE: | |
81 | if (out == NULL) | |
82 | goto err; | |
83 | *(u16 *)dest->data = out->type; | |
84 | break; | |
85 | case NFT_META_SKUID: | |
a8399231 | 86 | if (skb->sk == NULL || !sk_fullsock(skb->sk)) |
96518518 PM |
87 | goto err; |
88 | ||
89 | read_lock_bh(&skb->sk->sk_callback_lock); | |
90 | if (skb->sk->sk_socket == NULL || | |
91 | skb->sk->sk_socket->file == NULL) { | |
92 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
93 | goto err; | |
94 | } | |
95 | ||
96 | dest->data[0] = | |
97 | from_kuid_munged(&init_user_ns, | |
98 | skb->sk->sk_socket->file->f_cred->fsuid); | |
99 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
100 | break; | |
101 | case NFT_META_SKGID: | |
a8399231 | 102 | if (skb->sk == NULL || !sk_fullsock(skb->sk)) |
96518518 PM |
103 | goto err; |
104 | ||
105 | read_lock_bh(&skb->sk->sk_callback_lock); | |
106 | if (skb->sk->sk_socket == NULL || | |
107 | skb->sk->sk_socket->file == NULL) { | |
108 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
109 | goto err; | |
110 | } | |
111 | dest->data[0] = | |
112 | from_kgid_munged(&init_user_ns, | |
113 | skb->sk->sk_socket->file->f_cred->fsgid); | |
114 | read_unlock_bh(&skb->sk->sk_callback_lock); | |
115 | break; | |
06efbd6d | 116 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
117 | case NFT_META_RTCLASSID: { |
118 | const struct dst_entry *dst = skb_dst(skb); | |
119 | ||
120 | if (dst == NULL) | |
121 | goto err; | |
122 | dest->data[0] = dst->tclassid; | |
123 | break; | |
124 | } | |
125 | #endif | |
126 | #ifdef CONFIG_NETWORK_SECMARK | |
127 | case NFT_META_SECMARK: | |
128 | dest->data[0] = skb->secmark; | |
129 | break; | |
130 | #endif | |
e2a093ff AR |
131 | case NFT_META_PKTTYPE: |
132 | if (skb->pkt_type != PACKET_LOOPBACK) { | |
133 | dest->data[0] = skb->pkt_type; | |
134 | break; | |
135 | } | |
136 | ||
137 | switch (pkt->ops->pf) { | |
138 | case NFPROTO_IPV4: | |
139 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
140 | dest->data[0] = PACKET_MULTICAST; | |
141 | else | |
142 | dest->data[0] = PACKET_BROADCAST; | |
143 | break; | |
144 | case NFPROTO_IPV6: | |
145 | if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) | |
146 | dest->data[0] = PACKET_MULTICAST; | |
147 | else | |
148 | dest->data[0] = PACKET_BROADCAST; | |
149 | break; | |
150 | default: | |
151 | WARN_ON(1); | |
152 | goto err; | |
153 | } | |
154 | break; | |
afc5be30 | 155 | case NFT_META_CPU: |
14d14a5d | 156 | dest->data[0] = raw_smp_processor_id(); |
afc5be30 | 157 | break; |
3045d760 AR |
158 | case NFT_META_IIFGROUP: |
159 | if (in == NULL) | |
160 | goto err; | |
161 | dest->data[0] = in->group; | |
162 | break; | |
163 | case NFT_META_OIFGROUP: | |
164 | if (out == NULL) | |
165 | goto err; | |
166 | dest->data[0] = out->group; | |
167 | break; | |
ce674173 | 168 | case NFT_META_CGROUP: |
c5035c77 PNA |
169 | if (skb->sk == NULL || !sk_fullsock(skb->sk)) |
170 | goto err; | |
ce674173 AR |
171 | dest->data[0] = skb->sk->sk_classid; |
172 | break; | |
96518518 PM |
173 | default: |
174 | WARN_ON(1); | |
175 | goto err; | |
176 | } | |
177 | return; | |
178 | ||
179 | err: | |
180 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; | |
181 | } | |
aa45660c | 182 | EXPORT_SYMBOL_GPL(nft_meta_get_eval); |
96518518 | 183 | |
aa45660c TB |
184 | void nft_meta_set_eval(const struct nft_expr *expr, |
185 | struct nft_data data[NFT_REG_MAX + 1], | |
186 | const struct nft_pktinfo *pkt) | |
e035b77a ABG |
187 | { |
188 | const struct nft_meta *meta = nft_expr_priv(expr); | |
189 | struct sk_buff *skb = pkt->skb; | |
190 | u32 value = data[meta->sreg].data[0]; | |
191 | ||
192 | switch (meta->key) { | |
193 | case NFT_META_MARK: | |
194 | skb->mark = value; | |
195 | break; | |
196 | case NFT_META_PRIORITY: | |
197 | skb->priority = value; | |
198 | break; | |
199 | case NFT_META_NFTRACE: | |
200 | skb->nf_trace = 1; | |
201 | break; | |
202 | default: | |
203 | WARN_ON(1); | |
204 | } | |
205 | } | |
aa45660c | 206 | EXPORT_SYMBOL_GPL(nft_meta_set_eval); |
e035b77a | 207 | |
aa45660c | 208 | const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
96518518 PM |
209 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
210 | [NFTA_META_KEY] = { .type = NLA_U32 }, | |
e035b77a | 211 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
96518518 | 212 | }; |
aa45660c | 213 | EXPORT_SYMBOL_GPL(nft_meta_policy); |
96518518 | 214 | |
aa45660c TB |
215 | int nft_meta_get_init(const struct nft_ctx *ctx, |
216 | const struct nft_expr *expr, | |
217 | const struct nlattr * const tb[]) | |
96518518 | 218 | { |
d2caa696 | 219 | struct nft_meta *priv = nft_expr_priv(expr); |
45d9bcda | 220 | unsigned int len; |
96518518 | 221 | |
d2caa696 PM |
222 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
223 | switch (priv->key) { | |
96518518 | 224 | case NFT_META_PROTOCOL: |
45d9bcda PM |
225 | case NFT_META_IIFTYPE: |
226 | case NFT_META_OIFTYPE: | |
227 | len = sizeof(u16); | |
228 | break; | |
124edfa9 | 229 | case NFT_META_NFPROTO: |
4566bf27 | 230 | case NFT_META_L4PROTO: |
45d9bcda | 231 | case NFT_META_LEN: |
96518518 PM |
232 | case NFT_META_PRIORITY: |
233 | case NFT_META_MARK: | |
234 | case NFT_META_IIF: | |
235 | case NFT_META_OIF: | |
96518518 PM |
236 | case NFT_META_SKUID: |
237 | case NFT_META_SKGID: | |
06efbd6d | 238 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
239 | case NFT_META_RTCLASSID: |
240 | #endif | |
241 | #ifdef CONFIG_NETWORK_SECMARK | |
242 | case NFT_META_SECMARK: | |
243 | #endif | |
e2a093ff | 244 | case NFT_META_PKTTYPE: |
afc5be30 | 245 | case NFT_META_CPU: |
3045d760 AR |
246 | case NFT_META_IIFGROUP: |
247 | case NFT_META_OIFGROUP: | |
ce674173 | 248 | case NFT_META_CGROUP: |
45d9bcda PM |
249 | len = sizeof(u32); |
250 | break; | |
251 | case NFT_META_IIFNAME: | |
252 | case NFT_META_OIFNAME: | |
253 | len = IFNAMSIZ; | |
d2caa696 | 254 | break; |
96518518 PM |
255 | default: |
256 | return -EOPNOTSUPP; | |
257 | } | |
258 | ||
d2caa696 | 259 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG])); |
27e6d201 PM |
260 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
261 | NFT_DATA_VALUE, len); | |
e035b77a | 262 | } |
aa45660c | 263 | EXPORT_SYMBOL_GPL(nft_meta_get_init); |
e035b77a | 264 | |
aa45660c TB |
265 | int nft_meta_set_init(const struct nft_ctx *ctx, |
266 | const struct nft_expr *expr, | |
267 | const struct nlattr * const tb[]) | |
e035b77a ABG |
268 | { |
269 | struct nft_meta *priv = nft_expr_priv(expr); | |
270 | int err; | |
271 | ||
272 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
d2caa696 PM |
273 | switch (priv->key) { |
274 | case NFT_META_MARK: | |
275 | case NFT_META_PRIORITY: | |
276 | case NFT_META_NFTRACE: | |
277 | break; | |
278 | default: | |
279 | return -EOPNOTSUPP; | |
e035b77a ABG |
280 | } |
281 | ||
e035b77a | 282 | priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG])); |
b38895c5 PNA |
283 | err = nft_validate_input_register(priv->sreg); |
284 | if (err < 0) | |
285 | return err; | |
e035b77a ABG |
286 | |
287 | return 0; | |
96518518 | 288 | } |
aa45660c | 289 | EXPORT_SYMBOL_GPL(nft_meta_set_init); |
96518518 | 290 | |
aa45660c TB |
291 | int nft_meta_get_dump(struct sk_buff *skb, |
292 | const struct nft_expr *expr) | |
96518518 PM |
293 | { |
294 | const struct nft_meta *priv = nft_expr_priv(expr); | |
295 | ||
e035b77a ABG |
296 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
297 | goto nla_put_failure; | |
96518518 PM |
298 | if (nla_put_be32(skb, NFTA_META_DREG, htonl(priv->dreg))) |
299 | goto nla_put_failure; | |
e035b77a ABG |
300 | return 0; |
301 | ||
302 | nla_put_failure: | |
303 | return -1; | |
304 | } | |
aa45660c | 305 | EXPORT_SYMBOL_GPL(nft_meta_get_dump); |
e035b77a | 306 | |
aa45660c TB |
307 | int nft_meta_set_dump(struct sk_buff *skb, |
308 | const struct nft_expr *expr) | |
e035b77a ABG |
309 | { |
310 | const struct nft_meta *priv = nft_expr_priv(expr); | |
311 | ||
96518518 PM |
312 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
313 | goto nla_put_failure; | |
e035b77a ABG |
314 | if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg))) |
315 | goto nla_put_failure; | |
316 | ||
96518518 PM |
317 | return 0; |
318 | ||
319 | nla_put_failure: | |
320 | return -1; | |
321 | } | |
aa45660c | 322 | EXPORT_SYMBOL_GPL(nft_meta_set_dump); |
96518518 | 323 | |
ef1f7df9 | 324 | static struct nft_expr_type nft_meta_type; |
e035b77a | 325 | static const struct nft_expr_ops nft_meta_get_ops = { |
ef1f7df9 | 326 | .type = &nft_meta_type, |
96518518 | 327 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
e035b77a | 328 | .eval = nft_meta_get_eval, |
d2caa696 | 329 | .init = nft_meta_get_init, |
e035b77a | 330 | .dump = nft_meta_get_dump, |
ef1f7df9 PM |
331 | }; |
332 | ||
e035b77a ABG |
333 | static const struct nft_expr_ops nft_meta_set_ops = { |
334 | .type = &nft_meta_type, | |
335 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
336 | .eval = nft_meta_set_eval, | |
d2caa696 | 337 | .init = nft_meta_set_init, |
e035b77a ABG |
338 | .dump = nft_meta_set_dump, |
339 | }; | |
340 | ||
341 | static const struct nft_expr_ops * | |
342 | nft_meta_select_ops(const struct nft_ctx *ctx, | |
343 | const struct nlattr * const tb[]) | |
344 | { | |
345 | if (tb[NFTA_META_KEY] == NULL) | |
346 | return ERR_PTR(-EINVAL); | |
347 | ||
348 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
349 | return ERR_PTR(-EINVAL); | |
350 | ||
351 | if (tb[NFTA_META_DREG]) | |
352 | return &nft_meta_get_ops; | |
353 | ||
354 | if (tb[NFTA_META_SREG]) | |
355 | return &nft_meta_set_ops; | |
356 | ||
357 | return ERR_PTR(-EINVAL); | |
358 | } | |
359 | ||
ef1f7df9 PM |
360 | static struct nft_expr_type nft_meta_type __read_mostly = { |
361 | .name = "meta", | |
e035b77a | 362 | .select_ops = &nft_meta_select_ops, |
96518518 PM |
363 | .policy = nft_meta_policy, |
364 | .maxattr = NFTA_META_MAX, | |
ef1f7df9 | 365 | .owner = THIS_MODULE, |
96518518 PM |
366 | }; |
367 | ||
368 | static int __init nft_meta_module_init(void) | |
369 | { | |
ef1f7df9 | 370 | return nft_register_expr(&nft_meta_type); |
96518518 PM |
371 | } |
372 | ||
373 | static void __exit nft_meta_module_exit(void) | |
374 | { | |
ef1f7df9 | 375 | nft_unregister_expr(&nft_meta_type); |
96518518 PM |
376 | } |
377 | ||
378 | module_init(nft_meta_module_init); | |
379 | module_exit(nft_meta_module_exit); | |
380 | ||
381 | MODULE_LICENSE("GPL"); | |
382 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
383 | MODULE_ALIAS_NFT_EXPR("meta"); |