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Commit | Line | Data |
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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> |
e639f7ab | 21 | #include <linux/static_key.h> |
96518518 PM |
22 | #include <net/dst.h> |
23 | #include <net/sock.h> | |
24 | #include <net/tcp_states.h> /* for TCP_TIME_WAIT */ | |
25 | #include <net/netfilter/nf_tables.h> | |
e639f7ab | 26 | #include <net/netfilter/nf_tables_core.h> |
aa45660c | 27 | #include <net/netfilter/nft_meta.h> |
96518518 | 28 | |
b4aae759 FW |
29 | #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */ |
30 | ||
b07edbe1 FW |
31 | static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state); |
32 | ||
aa45660c | 33 | void nft_meta_get_eval(const struct nft_expr *expr, |
a55e22e9 | 34 | struct nft_regs *regs, |
aa45660c | 35 | const struct nft_pktinfo *pkt) |
96518518 PM |
36 | { |
37 | const struct nft_meta *priv = nft_expr_priv(expr); | |
38 | const struct sk_buff *skb = pkt->skb; | |
39 | const struct net_device *in = pkt->in, *out = pkt->out; | |
3aed8225 | 40 | struct sock *sk; |
49499c3e | 41 | u32 *dest = ®s->data[priv->dreg]; |
96518518 PM |
42 | |
43 | switch (priv->key) { | |
44 | case NFT_META_LEN: | |
fad136ea | 45 | *dest = skb->len; |
96518518 PM |
46 | break; |
47 | case NFT_META_PROTOCOL: | |
49499c3e | 48 | *dest = 0; |
fad136ea | 49 | *(__be16 *)dest = skb->protocol; |
96518518 | 50 | break; |
124edfa9 | 51 | case NFT_META_NFPROTO: |
6aa187f2 | 52 | *dest = pkt->pf; |
124edfa9 | 53 | break; |
4566bf27 | 54 | case NFT_META_L4PROTO: |
fad136ea | 55 | *dest = pkt->tprot; |
4566bf27 | 56 | break; |
96518518 | 57 | case NFT_META_PRIORITY: |
fad136ea | 58 | *dest = skb->priority; |
96518518 PM |
59 | break; |
60 | case NFT_META_MARK: | |
fad136ea | 61 | *dest = skb->mark; |
96518518 PM |
62 | break; |
63 | case NFT_META_IIF: | |
64 | if (in == NULL) | |
65 | goto err; | |
fad136ea | 66 | *dest = in->ifindex; |
96518518 PM |
67 | break; |
68 | case NFT_META_OIF: | |
69 | if (out == NULL) | |
70 | goto err; | |
fad136ea | 71 | *dest = out->ifindex; |
96518518 PM |
72 | break; |
73 | case NFT_META_IIFNAME: | |
74 | if (in == NULL) | |
75 | goto err; | |
fad136ea | 76 | strncpy((char *)dest, in->name, IFNAMSIZ); |
96518518 PM |
77 | break; |
78 | case NFT_META_OIFNAME: | |
79 | if (out == NULL) | |
80 | goto err; | |
fad136ea | 81 | strncpy((char *)dest, out->name, IFNAMSIZ); |
96518518 PM |
82 | break; |
83 | case NFT_META_IIFTYPE: | |
84 | if (in == NULL) | |
85 | goto err; | |
49499c3e | 86 | *dest = 0; |
fad136ea | 87 | *(u16 *)dest = in->type; |
96518518 PM |
88 | break; |
89 | case NFT_META_OIFTYPE: | |
90 | if (out == NULL) | |
91 | goto err; | |
49499c3e | 92 | *dest = 0; |
fad136ea | 93 | *(u16 *)dest = out->type; |
96518518 PM |
94 | break; |
95 | case NFT_META_SKUID: | |
3aed8225 ED |
96 | sk = skb_to_full_sk(skb); |
97 | if (!sk || !sk_fullsock(sk)) | |
96518518 PM |
98 | goto err; |
99 | ||
3aed8225 ED |
100 | read_lock_bh(&sk->sk_callback_lock); |
101 | if (sk->sk_socket == NULL || | |
102 | sk->sk_socket->file == NULL) { | |
103 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
104 | goto err; |
105 | } | |
106 | ||
fad136ea | 107 | *dest = from_kuid_munged(&init_user_ns, |
3aed8225 ED |
108 | sk->sk_socket->file->f_cred->fsuid); |
109 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
110 | break; |
111 | case NFT_META_SKGID: | |
3aed8225 ED |
112 | sk = skb_to_full_sk(skb); |
113 | if (!sk || !sk_fullsock(sk)) | |
96518518 PM |
114 | goto err; |
115 | ||
3aed8225 ED |
116 | read_lock_bh(&sk->sk_callback_lock); |
117 | if (sk->sk_socket == NULL || | |
118 | sk->sk_socket->file == NULL) { | |
119 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
120 | goto err; |
121 | } | |
fad136ea | 122 | *dest = from_kgid_munged(&init_user_ns, |
3aed8225 ED |
123 | sk->sk_socket->file->f_cred->fsgid); |
124 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 | 125 | break; |
06efbd6d | 126 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
127 | case NFT_META_RTCLASSID: { |
128 | const struct dst_entry *dst = skb_dst(skb); | |
129 | ||
130 | if (dst == NULL) | |
131 | goto err; | |
fad136ea | 132 | *dest = dst->tclassid; |
96518518 PM |
133 | break; |
134 | } | |
135 | #endif | |
136 | #ifdef CONFIG_NETWORK_SECMARK | |
137 | case NFT_META_SECMARK: | |
fad136ea | 138 | *dest = skb->secmark; |
96518518 PM |
139 | break; |
140 | #endif | |
e2a093ff AR |
141 | case NFT_META_PKTTYPE: |
142 | if (skb->pkt_type != PACKET_LOOPBACK) { | |
fad136ea | 143 | *dest = skb->pkt_type; |
e2a093ff AR |
144 | break; |
145 | } | |
146 | ||
6aa187f2 | 147 | switch (pkt->pf) { |
e2a093ff AR |
148 | case NFPROTO_IPV4: |
149 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
fad136ea | 150 | *dest = PACKET_MULTICAST; |
e2a093ff | 151 | else |
fad136ea | 152 | *dest = PACKET_BROADCAST; |
e2a093ff AR |
153 | break; |
154 | case NFPROTO_IPV6: | |
155 | if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) | |
fad136ea | 156 | *dest = PACKET_MULTICAST; |
e2a093ff | 157 | else |
fad136ea | 158 | *dest = PACKET_BROADCAST; |
e2a093ff AR |
159 | break; |
160 | default: | |
161 | WARN_ON(1); | |
162 | goto err; | |
163 | } | |
164 | break; | |
afc5be30 | 165 | case NFT_META_CPU: |
fad136ea | 166 | *dest = raw_smp_processor_id(); |
afc5be30 | 167 | break; |
3045d760 AR |
168 | case NFT_META_IIFGROUP: |
169 | if (in == NULL) | |
170 | goto err; | |
fad136ea | 171 | *dest = in->group; |
3045d760 AR |
172 | break; |
173 | case NFT_META_OIFGROUP: | |
174 | if (out == NULL) | |
175 | goto err; | |
fad136ea | 176 | *dest = out->group; |
3045d760 | 177 | break; |
e181a543 | 178 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 179 | case NFT_META_CGROUP: |
3aed8225 ED |
180 | sk = skb_to_full_sk(skb); |
181 | if (!sk || !sk_fullsock(sk)) | |
c5035c77 | 182 | goto err; |
2a56a1fe | 183 | *dest = sock_cgroup_classid(&sk->sk_cgrp_data); |
ce674173 | 184 | break; |
e181a543 | 185 | #endif |
b07edbe1 FW |
186 | case NFT_META_PRANDOM: { |
187 | struct rnd_state *state = this_cpu_ptr(&nft_prandom_state); | |
188 | *dest = prandom_u32_state(state); | |
189 | break; | |
190 | } | |
96518518 PM |
191 | default: |
192 | WARN_ON(1); | |
193 | goto err; | |
194 | } | |
195 | return; | |
196 | ||
197 | err: | |
a55e22e9 | 198 | regs->verdict.code = NFT_BREAK; |
96518518 | 199 | } |
aa45660c | 200 | EXPORT_SYMBOL_GPL(nft_meta_get_eval); |
96518518 | 201 | |
b4aae759 FW |
202 | /* don't change or set _LOOPBACK, _USER, etc. */ |
203 | static bool pkt_type_ok(u32 p) | |
204 | { | |
205 | return p == PACKET_HOST || p == PACKET_BROADCAST || | |
206 | p == PACKET_MULTICAST || p == PACKET_OTHERHOST; | |
207 | } | |
208 | ||
aa45660c | 209 | void nft_meta_set_eval(const struct nft_expr *expr, |
a55e22e9 | 210 | struct nft_regs *regs, |
aa45660c | 211 | const struct nft_pktinfo *pkt) |
e035b77a ABG |
212 | { |
213 | const struct nft_meta *meta = nft_expr_priv(expr); | |
214 | struct sk_buff *skb = pkt->skb; | |
49499c3e | 215 | u32 value = regs->data[meta->sreg]; |
e035b77a ABG |
216 | |
217 | switch (meta->key) { | |
218 | case NFT_META_MARK: | |
219 | skb->mark = value; | |
220 | break; | |
221 | case NFT_META_PRIORITY: | |
222 | skb->priority = value; | |
223 | break; | |
b4aae759 FW |
224 | case NFT_META_PKTTYPE: |
225 | if (skb->pkt_type != value && | |
226 | pkt_type_ok(value) && pkt_type_ok(skb->pkt_type)) | |
227 | skb->pkt_type = value; | |
228 | break; | |
e035b77a ABG |
229 | case NFT_META_NFTRACE: |
230 | skb->nf_trace = 1; | |
231 | break; | |
232 | default: | |
233 | WARN_ON(1); | |
234 | } | |
235 | } | |
aa45660c | 236 | EXPORT_SYMBOL_GPL(nft_meta_set_eval); |
e035b77a | 237 | |
aa45660c | 238 | const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
96518518 PM |
239 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
240 | [NFTA_META_KEY] = { .type = NLA_U32 }, | |
e035b77a | 241 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
96518518 | 242 | }; |
aa45660c | 243 | EXPORT_SYMBOL_GPL(nft_meta_policy); |
96518518 | 244 | |
aa45660c TB |
245 | int nft_meta_get_init(const struct nft_ctx *ctx, |
246 | const struct nft_expr *expr, | |
247 | const struct nlattr * const tb[]) | |
96518518 | 248 | { |
d2caa696 | 249 | struct nft_meta *priv = nft_expr_priv(expr); |
45d9bcda | 250 | unsigned int len; |
96518518 | 251 | |
d2caa696 PM |
252 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
253 | switch (priv->key) { | |
96518518 | 254 | case NFT_META_PROTOCOL: |
45d9bcda PM |
255 | case NFT_META_IIFTYPE: |
256 | case NFT_META_OIFTYPE: | |
257 | len = sizeof(u16); | |
258 | break; | |
124edfa9 | 259 | case NFT_META_NFPROTO: |
4566bf27 | 260 | case NFT_META_L4PROTO: |
45d9bcda | 261 | case NFT_META_LEN: |
96518518 PM |
262 | case NFT_META_PRIORITY: |
263 | case NFT_META_MARK: | |
264 | case NFT_META_IIF: | |
265 | case NFT_META_OIF: | |
96518518 PM |
266 | case NFT_META_SKUID: |
267 | case NFT_META_SKGID: | |
06efbd6d | 268 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
269 | case NFT_META_RTCLASSID: |
270 | #endif | |
271 | #ifdef CONFIG_NETWORK_SECMARK | |
272 | case NFT_META_SECMARK: | |
273 | #endif | |
e2a093ff | 274 | case NFT_META_PKTTYPE: |
afc5be30 | 275 | case NFT_META_CPU: |
3045d760 AR |
276 | case NFT_META_IIFGROUP: |
277 | case NFT_META_OIFGROUP: | |
e181a543 | 278 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 279 | case NFT_META_CGROUP: |
e181a543 | 280 | #endif |
45d9bcda PM |
281 | len = sizeof(u32); |
282 | break; | |
283 | case NFT_META_IIFNAME: | |
284 | case NFT_META_OIFNAME: | |
285 | len = IFNAMSIZ; | |
d2caa696 | 286 | break; |
b07edbe1 FW |
287 | case NFT_META_PRANDOM: |
288 | prandom_init_once(&nft_prandom_state); | |
289 | len = sizeof(u32); | |
290 | break; | |
96518518 PM |
291 | default: |
292 | return -EOPNOTSUPP; | |
293 | } | |
294 | ||
b1c96ed3 | 295 | priv->dreg = nft_parse_register(tb[NFTA_META_DREG]); |
27e6d201 PM |
296 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
297 | NFT_DATA_VALUE, len); | |
e035b77a | 298 | } |
aa45660c | 299 | EXPORT_SYMBOL_GPL(nft_meta_get_init); |
e035b77a | 300 | |
b4aae759 FW |
301 | static int nft_meta_set_init_pkttype(const struct nft_ctx *ctx) |
302 | { | |
303 | unsigned int hooks; | |
304 | ||
305 | switch (ctx->afi->family) { | |
306 | case NFPROTO_BRIDGE: | |
307 | hooks = 1 << NF_BR_PRE_ROUTING; | |
308 | break; | |
309 | case NFPROTO_NETDEV: | |
310 | hooks = 1 << NF_NETDEV_INGRESS; | |
311 | break; | |
312 | default: | |
313 | return -EOPNOTSUPP; | |
314 | } | |
315 | ||
316 | return nft_chain_validate_hooks(ctx->chain, hooks); | |
317 | } | |
318 | ||
aa45660c TB |
319 | int nft_meta_set_init(const struct nft_ctx *ctx, |
320 | const struct nft_expr *expr, | |
321 | const struct nlattr * const tb[]) | |
e035b77a ABG |
322 | { |
323 | struct nft_meta *priv = nft_expr_priv(expr); | |
d07db988 | 324 | unsigned int len; |
e035b77a ABG |
325 | int err; |
326 | ||
327 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
d2caa696 PM |
328 | switch (priv->key) { |
329 | case NFT_META_MARK: | |
330 | case NFT_META_PRIORITY: | |
d07db988 PM |
331 | len = sizeof(u32); |
332 | break; | |
d2caa696 | 333 | case NFT_META_NFTRACE: |
d07db988 | 334 | len = sizeof(u8); |
d2caa696 | 335 | break; |
b4aae759 FW |
336 | case NFT_META_PKTTYPE: |
337 | err = nft_meta_set_init_pkttype(ctx); | |
338 | if (err) | |
339 | return err; | |
340 | len = sizeof(u8); | |
341 | break; | |
d2caa696 PM |
342 | default: |
343 | return -EOPNOTSUPP; | |
e035b77a ABG |
344 | } |
345 | ||
b1c96ed3 | 346 | priv->sreg = nft_parse_register(tb[NFTA_META_SREG]); |
d07db988 | 347 | err = nft_validate_register_load(priv->sreg, len); |
b38895c5 PNA |
348 | if (err < 0) |
349 | return err; | |
e035b77a | 350 | |
e639f7ab FW |
351 | if (priv->key == NFT_META_NFTRACE) |
352 | static_branch_inc(&nft_trace_enabled); | |
353 | ||
e035b77a | 354 | return 0; |
96518518 | 355 | } |
aa45660c | 356 | EXPORT_SYMBOL_GPL(nft_meta_set_init); |
96518518 | 357 | |
aa45660c TB |
358 | int nft_meta_get_dump(struct sk_buff *skb, |
359 | const struct nft_expr *expr) | |
96518518 PM |
360 | { |
361 | const struct nft_meta *priv = nft_expr_priv(expr); | |
362 | ||
e035b77a ABG |
363 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
364 | goto nla_put_failure; | |
b1c96ed3 | 365 | if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg)) |
96518518 | 366 | goto nla_put_failure; |
e035b77a ABG |
367 | return 0; |
368 | ||
369 | nla_put_failure: | |
370 | return -1; | |
371 | } | |
aa45660c | 372 | EXPORT_SYMBOL_GPL(nft_meta_get_dump); |
e035b77a | 373 | |
aa45660c TB |
374 | int nft_meta_set_dump(struct sk_buff *skb, |
375 | const struct nft_expr *expr) | |
e035b77a ABG |
376 | { |
377 | const struct nft_meta *priv = nft_expr_priv(expr); | |
378 | ||
96518518 PM |
379 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
380 | goto nla_put_failure; | |
b1c96ed3 | 381 | if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg)) |
e035b77a ABG |
382 | goto nla_put_failure; |
383 | ||
96518518 PM |
384 | return 0; |
385 | ||
386 | nla_put_failure: | |
387 | return -1; | |
388 | } | |
aa45660c | 389 | EXPORT_SYMBOL_GPL(nft_meta_set_dump); |
96518518 | 390 | |
e639f7ab FW |
391 | void nft_meta_set_destroy(const struct nft_ctx *ctx, |
392 | const struct nft_expr *expr) | |
393 | { | |
394 | const struct nft_meta *priv = nft_expr_priv(expr); | |
395 | ||
396 | if (priv->key == NFT_META_NFTRACE) | |
397 | static_branch_dec(&nft_trace_enabled); | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(nft_meta_set_destroy); | |
400 | ||
ef1f7df9 | 401 | static struct nft_expr_type nft_meta_type; |
e035b77a | 402 | static const struct nft_expr_ops nft_meta_get_ops = { |
ef1f7df9 | 403 | .type = &nft_meta_type, |
96518518 | 404 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
e035b77a | 405 | .eval = nft_meta_get_eval, |
d2caa696 | 406 | .init = nft_meta_get_init, |
e035b77a | 407 | .dump = nft_meta_get_dump, |
ef1f7df9 PM |
408 | }; |
409 | ||
e035b77a ABG |
410 | static const struct nft_expr_ops nft_meta_set_ops = { |
411 | .type = &nft_meta_type, | |
412 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
413 | .eval = nft_meta_set_eval, | |
d2caa696 | 414 | .init = nft_meta_set_init, |
e639f7ab | 415 | .destroy = nft_meta_set_destroy, |
e035b77a ABG |
416 | .dump = nft_meta_set_dump, |
417 | }; | |
418 | ||
419 | static const struct nft_expr_ops * | |
420 | nft_meta_select_ops(const struct nft_ctx *ctx, | |
421 | const struct nlattr * const tb[]) | |
422 | { | |
423 | if (tb[NFTA_META_KEY] == NULL) | |
424 | return ERR_PTR(-EINVAL); | |
425 | ||
426 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
427 | return ERR_PTR(-EINVAL); | |
428 | ||
429 | if (tb[NFTA_META_DREG]) | |
430 | return &nft_meta_get_ops; | |
431 | ||
432 | if (tb[NFTA_META_SREG]) | |
433 | return &nft_meta_set_ops; | |
434 | ||
435 | return ERR_PTR(-EINVAL); | |
436 | } | |
437 | ||
ef1f7df9 PM |
438 | static struct nft_expr_type nft_meta_type __read_mostly = { |
439 | .name = "meta", | |
e035b77a | 440 | .select_ops = &nft_meta_select_ops, |
96518518 PM |
441 | .policy = nft_meta_policy, |
442 | .maxattr = NFTA_META_MAX, | |
ef1f7df9 | 443 | .owner = THIS_MODULE, |
96518518 PM |
444 | }; |
445 | ||
446 | static int __init nft_meta_module_init(void) | |
447 | { | |
ef1f7df9 | 448 | return nft_register_expr(&nft_meta_type); |
96518518 PM |
449 | } |
450 | ||
451 | static void __exit nft_meta_module_exit(void) | |
452 | { | |
ef1f7df9 | 453 | nft_unregister_expr(&nft_meta_type); |
96518518 PM |
454 | } |
455 | ||
456 | module_init(nft_meta_module_init); | |
457 | module_exit(nft_meta_module_exit); | |
458 | ||
459 | MODULE_LICENSE("GPL"); | |
460 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
461 | MODULE_ALIAS_NFT_EXPR("meta"); |