Commit | Line | Data |
---|---|---|
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 | 27 | void nft_meta_get_eval(const struct nft_expr *expr, |
a55e22e9 | 28 | struct nft_regs *regs, |
aa45660c | 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; | |
3aed8225 | 34 | struct sock *sk; |
49499c3e | 35 | u32 *dest = ®s->data[priv->dreg]; |
96518518 PM |
36 | |
37 | switch (priv->key) { | |
38 | case NFT_META_LEN: | |
fad136ea | 39 | *dest = skb->len; |
96518518 PM |
40 | break; |
41 | case NFT_META_PROTOCOL: | |
49499c3e | 42 | *dest = 0; |
fad136ea | 43 | *(__be16 *)dest = skb->protocol; |
96518518 | 44 | break; |
124edfa9 | 45 | case NFT_META_NFPROTO: |
6aa187f2 | 46 | *dest = pkt->pf; |
124edfa9 | 47 | break; |
4566bf27 | 48 | case NFT_META_L4PROTO: |
fad136ea | 49 | *dest = pkt->tprot; |
4566bf27 | 50 | break; |
96518518 | 51 | case NFT_META_PRIORITY: |
fad136ea | 52 | *dest = skb->priority; |
96518518 PM |
53 | break; |
54 | case NFT_META_MARK: | |
fad136ea | 55 | *dest = skb->mark; |
96518518 PM |
56 | break; |
57 | case NFT_META_IIF: | |
58 | if (in == NULL) | |
59 | goto err; | |
fad136ea | 60 | *dest = in->ifindex; |
96518518 PM |
61 | break; |
62 | case NFT_META_OIF: | |
63 | if (out == NULL) | |
64 | goto err; | |
fad136ea | 65 | *dest = out->ifindex; |
96518518 PM |
66 | break; |
67 | case NFT_META_IIFNAME: | |
68 | if (in == NULL) | |
69 | goto err; | |
fad136ea | 70 | strncpy((char *)dest, in->name, IFNAMSIZ); |
96518518 PM |
71 | break; |
72 | case NFT_META_OIFNAME: | |
73 | if (out == NULL) | |
74 | goto err; | |
fad136ea | 75 | strncpy((char *)dest, out->name, IFNAMSIZ); |
96518518 PM |
76 | break; |
77 | case NFT_META_IIFTYPE: | |
78 | if (in == NULL) | |
79 | goto err; | |
49499c3e | 80 | *dest = 0; |
fad136ea | 81 | *(u16 *)dest = in->type; |
96518518 PM |
82 | break; |
83 | case NFT_META_OIFTYPE: | |
84 | if (out == NULL) | |
85 | goto err; | |
49499c3e | 86 | *dest = 0; |
fad136ea | 87 | *(u16 *)dest = out->type; |
96518518 PM |
88 | break; |
89 | case NFT_META_SKUID: | |
3aed8225 ED |
90 | sk = skb_to_full_sk(skb); |
91 | if (!sk || !sk_fullsock(sk)) | |
96518518 PM |
92 | goto err; |
93 | ||
3aed8225 ED |
94 | read_lock_bh(&sk->sk_callback_lock); |
95 | if (sk->sk_socket == NULL || | |
96 | sk->sk_socket->file == NULL) { | |
97 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
98 | goto err; |
99 | } | |
100 | ||
fad136ea | 101 | *dest = from_kuid_munged(&init_user_ns, |
3aed8225 ED |
102 | sk->sk_socket->file->f_cred->fsuid); |
103 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
104 | break; |
105 | case NFT_META_SKGID: | |
3aed8225 ED |
106 | sk = skb_to_full_sk(skb); |
107 | if (!sk || !sk_fullsock(sk)) | |
96518518 PM |
108 | goto err; |
109 | ||
3aed8225 ED |
110 | read_lock_bh(&sk->sk_callback_lock); |
111 | if (sk->sk_socket == NULL || | |
112 | sk->sk_socket->file == NULL) { | |
113 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
114 | goto err; |
115 | } | |
fad136ea | 116 | *dest = from_kgid_munged(&init_user_ns, |
3aed8225 ED |
117 | sk->sk_socket->file->f_cred->fsgid); |
118 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 | 119 | break; |
06efbd6d | 120 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
121 | case NFT_META_RTCLASSID: { |
122 | const struct dst_entry *dst = skb_dst(skb); | |
123 | ||
124 | if (dst == NULL) | |
125 | goto err; | |
fad136ea | 126 | *dest = dst->tclassid; |
96518518 PM |
127 | break; |
128 | } | |
129 | #endif | |
130 | #ifdef CONFIG_NETWORK_SECMARK | |
131 | case NFT_META_SECMARK: | |
fad136ea | 132 | *dest = skb->secmark; |
96518518 PM |
133 | break; |
134 | #endif | |
e2a093ff AR |
135 | case NFT_META_PKTTYPE: |
136 | if (skb->pkt_type != PACKET_LOOPBACK) { | |
fad136ea | 137 | *dest = skb->pkt_type; |
e2a093ff AR |
138 | break; |
139 | } | |
140 | ||
6aa187f2 | 141 | switch (pkt->pf) { |
e2a093ff AR |
142 | case NFPROTO_IPV4: |
143 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
fad136ea | 144 | *dest = PACKET_MULTICAST; |
e2a093ff | 145 | else |
fad136ea | 146 | *dest = PACKET_BROADCAST; |
e2a093ff AR |
147 | break; |
148 | case NFPROTO_IPV6: | |
149 | if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) | |
fad136ea | 150 | *dest = PACKET_MULTICAST; |
e2a093ff | 151 | else |
fad136ea | 152 | *dest = PACKET_BROADCAST; |
e2a093ff AR |
153 | break; |
154 | default: | |
155 | WARN_ON(1); | |
156 | goto err; | |
157 | } | |
158 | break; | |
afc5be30 | 159 | case NFT_META_CPU: |
fad136ea | 160 | *dest = raw_smp_processor_id(); |
afc5be30 | 161 | break; |
3045d760 AR |
162 | case NFT_META_IIFGROUP: |
163 | if (in == NULL) | |
164 | goto err; | |
fad136ea | 165 | *dest = in->group; |
3045d760 AR |
166 | break; |
167 | case NFT_META_OIFGROUP: | |
168 | if (out == NULL) | |
169 | goto err; | |
fad136ea | 170 | *dest = out->group; |
3045d760 | 171 | break; |
e181a543 | 172 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 173 | case NFT_META_CGROUP: |
3aed8225 ED |
174 | sk = skb_to_full_sk(skb); |
175 | if (!sk || !sk_fullsock(sk)) | |
c5035c77 | 176 | goto err; |
3aed8225 | 177 | *dest = sk->sk_classid; |
ce674173 | 178 | break; |
e181a543 | 179 | #endif |
96518518 PM |
180 | default: |
181 | WARN_ON(1); | |
182 | goto err; | |
183 | } | |
184 | return; | |
185 | ||
186 | err: | |
a55e22e9 | 187 | regs->verdict.code = NFT_BREAK; |
96518518 | 188 | } |
aa45660c | 189 | EXPORT_SYMBOL_GPL(nft_meta_get_eval); |
96518518 | 190 | |
aa45660c | 191 | void nft_meta_set_eval(const struct nft_expr *expr, |
a55e22e9 | 192 | struct nft_regs *regs, |
aa45660c | 193 | const struct nft_pktinfo *pkt) |
e035b77a ABG |
194 | { |
195 | const struct nft_meta *meta = nft_expr_priv(expr); | |
196 | struct sk_buff *skb = pkt->skb; | |
49499c3e | 197 | u32 value = regs->data[meta->sreg]; |
e035b77a ABG |
198 | |
199 | switch (meta->key) { | |
200 | case NFT_META_MARK: | |
201 | skb->mark = value; | |
202 | break; | |
203 | case NFT_META_PRIORITY: | |
204 | skb->priority = value; | |
205 | break; | |
206 | case NFT_META_NFTRACE: | |
207 | skb->nf_trace = 1; | |
208 | break; | |
209 | default: | |
210 | WARN_ON(1); | |
211 | } | |
212 | } | |
aa45660c | 213 | EXPORT_SYMBOL_GPL(nft_meta_set_eval); |
e035b77a | 214 | |
aa45660c | 215 | const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
96518518 PM |
216 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
217 | [NFTA_META_KEY] = { .type = NLA_U32 }, | |
e035b77a | 218 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
96518518 | 219 | }; |
aa45660c | 220 | EXPORT_SYMBOL_GPL(nft_meta_policy); |
96518518 | 221 | |
aa45660c TB |
222 | int nft_meta_get_init(const struct nft_ctx *ctx, |
223 | const struct nft_expr *expr, | |
224 | const struct nlattr * const tb[]) | |
96518518 | 225 | { |
d2caa696 | 226 | struct nft_meta *priv = nft_expr_priv(expr); |
45d9bcda | 227 | unsigned int len; |
96518518 | 228 | |
d2caa696 PM |
229 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
230 | switch (priv->key) { | |
96518518 | 231 | case NFT_META_PROTOCOL: |
45d9bcda PM |
232 | case NFT_META_IIFTYPE: |
233 | case NFT_META_OIFTYPE: | |
234 | len = sizeof(u16); | |
235 | break; | |
124edfa9 | 236 | case NFT_META_NFPROTO: |
4566bf27 | 237 | case NFT_META_L4PROTO: |
45d9bcda | 238 | case NFT_META_LEN: |
96518518 PM |
239 | case NFT_META_PRIORITY: |
240 | case NFT_META_MARK: | |
241 | case NFT_META_IIF: | |
242 | case NFT_META_OIF: | |
96518518 PM |
243 | case NFT_META_SKUID: |
244 | case NFT_META_SKGID: | |
06efbd6d | 245 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
246 | case NFT_META_RTCLASSID: |
247 | #endif | |
248 | #ifdef CONFIG_NETWORK_SECMARK | |
249 | case NFT_META_SECMARK: | |
250 | #endif | |
e2a093ff | 251 | case NFT_META_PKTTYPE: |
afc5be30 | 252 | case NFT_META_CPU: |
3045d760 AR |
253 | case NFT_META_IIFGROUP: |
254 | case NFT_META_OIFGROUP: | |
e181a543 | 255 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 256 | case NFT_META_CGROUP: |
e181a543 | 257 | #endif |
45d9bcda PM |
258 | len = sizeof(u32); |
259 | break; | |
260 | case NFT_META_IIFNAME: | |
261 | case NFT_META_OIFNAME: | |
262 | len = IFNAMSIZ; | |
d2caa696 | 263 | break; |
96518518 PM |
264 | default: |
265 | return -EOPNOTSUPP; | |
266 | } | |
267 | ||
b1c96ed3 | 268 | priv->dreg = nft_parse_register(tb[NFTA_META_DREG]); |
27e6d201 PM |
269 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
270 | NFT_DATA_VALUE, len); | |
e035b77a | 271 | } |
aa45660c | 272 | EXPORT_SYMBOL_GPL(nft_meta_get_init); |
e035b77a | 273 | |
aa45660c TB |
274 | int nft_meta_set_init(const struct nft_ctx *ctx, |
275 | const struct nft_expr *expr, | |
276 | const struct nlattr * const tb[]) | |
e035b77a ABG |
277 | { |
278 | struct nft_meta *priv = nft_expr_priv(expr); | |
d07db988 | 279 | unsigned int len; |
e035b77a ABG |
280 | int err; |
281 | ||
282 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
d2caa696 PM |
283 | switch (priv->key) { |
284 | case NFT_META_MARK: | |
285 | case NFT_META_PRIORITY: | |
d07db988 PM |
286 | len = sizeof(u32); |
287 | break; | |
d2caa696 | 288 | case NFT_META_NFTRACE: |
d07db988 | 289 | len = sizeof(u8); |
d2caa696 PM |
290 | break; |
291 | default: | |
292 | return -EOPNOTSUPP; | |
e035b77a ABG |
293 | } |
294 | ||
b1c96ed3 | 295 | priv->sreg = nft_parse_register(tb[NFTA_META_SREG]); |
d07db988 | 296 | err = nft_validate_register_load(priv->sreg, len); |
b38895c5 PNA |
297 | if (err < 0) |
298 | return err; | |
e035b77a ABG |
299 | |
300 | return 0; | |
96518518 | 301 | } |
aa45660c | 302 | EXPORT_SYMBOL_GPL(nft_meta_set_init); |
96518518 | 303 | |
aa45660c TB |
304 | int nft_meta_get_dump(struct sk_buff *skb, |
305 | const struct nft_expr *expr) | |
96518518 PM |
306 | { |
307 | const struct nft_meta *priv = nft_expr_priv(expr); | |
308 | ||
e035b77a ABG |
309 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
310 | goto nla_put_failure; | |
b1c96ed3 | 311 | if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg)) |
96518518 | 312 | goto nla_put_failure; |
e035b77a ABG |
313 | return 0; |
314 | ||
315 | nla_put_failure: | |
316 | return -1; | |
317 | } | |
aa45660c | 318 | EXPORT_SYMBOL_GPL(nft_meta_get_dump); |
e035b77a | 319 | |
aa45660c TB |
320 | int nft_meta_set_dump(struct sk_buff *skb, |
321 | const struct nft_expr *expr) | |
e035b77a ABG |
322 | { |
323 | const struct nft_meta *priv = nft_expr_priv(expr); | |
324 | ||
96518518 PM |
325 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
326 | goto nla_put_failure; | |
b1c96ed3 | 327 | if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg)) |
e035b77a ABG |
328 | goto nla_put_failure; |
329 | ||
96518518 PM |
330 | return 0; |
331 | ||
332 | nla_put_failure: | |
333 | return -1; | |
334 | } | |
aa45660c | 335 | EXPORT_SYMBOL_GPL(nft_meta_set_dump); |
96518518 | 336 | |
ef1f7df9 | 337 | static struct nft_expr_type nft_meta_type; |
e035b77a | 338 | static const struct nft_expr_ops nft_meta_get_ops = { |
ef1f7df9 | 339 | .type = &nft_meta_type, |
96518518 | 340 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
e035b77a | 341 | .eval = nft_meta_get_eval, |
d2caa696 | 342 | .init = nft_meta_get_init, |
e035b77a | 343 | .dump = nft_meta_get_dump, |
ef1f7df9 PM |
344 | }; |
345 | ||
e035b77a ABG |
346 | static const struct nft_expr_ops nft_meta_set_ops = { |
347 | .type = &nft_meta_type, | |
348 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
349 | .eval = nft_meta_set_eval, | |
d2caa696 | 350 | .init = nft_meta_set_init, |
e035b77a ABG |
351 | .dump = nft_meta_set_dump, |
352 | }; | |
353 | ||
354 | static const struct nft_expr_ops * | |
355 | nft_meta_select_ops(const struct nft_ctx *ctx, | |
356 | const struct nlattr * const tb[]) | |
357 | { | |
358 | if (tb[NFTA_META_KEY] == NULL) | |
359 | return ERR_PTR(-EINVAL); | |
360 | ||
361 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
362 | return ERR_PTR(-EINVAL); | |
363 | ||
364 | if (tb[NFTA_META_DREG]) | |
365 | return &nft_meta_get_ops; | |
366 | ||
367 | if (tb[NFTA_META_SREG]) | |
368 | return &nft_meta_set_ops; | |
369 | ||
370 | return ERR_PTR(-EINVAL); | |
371 | } | |
372 | ||
ef1f7df9 PM |
373 | static struct nft_expr_type nft_meta_type __read_mostly = { |
374 | .name = "meta", | |
e035b77a | 375 | .select_ops = &nft_meta_select_ops, |
96518518 PM |
376 | .policy = nft_meta_policy, |
377 | .maxattr = NFTA_META_MAX, | |
ef1f7df9 | 378 | .owner = THIS_MODULE, |
96518518 PM |
379 | }; |
380 | ||
381 | static int __init nft_meta_module_init(void) | |
382 | { | |
ef1f7df9 | 383 | return nft_register_expr(&nft_meta_type); |
96518518 PM |
384 | } |
385 | ||
386 | static void __exit nft_meta_module_exit(void) | |
387 | { | |
ef1f7df9 | 388 | nft_unregister_expr(&nft_meta_type); |
96518518 PM |
389 | } |
390 | ||
391 | module_init(nft_meta_module_init); | |
392 | module_exit(nft_meta_module_exit); | |
393 | ||
394 | MODULE_LICENSE("GPL"); | |
395 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
396 | MODULE_ALIAS_NFT_EXPR("meta"); |