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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: |
beac5afa PNA |
55 | if (!pkt->tprot_set) |
56 | goto err; | |
fad136ea | 57 | *dest = pkt->tprot; |
4566bf27 | 58 | break; |
96518518 | 59 | case NFT_META_PRIORITY: |
fad136ea | 60 | *dest = skb->priority; |
96518518 PM |
61 | break; |
62 | case NFT_META_MARK: | |
fad136ea | 63 | *dest = skb->mark; |
96518518 PM |
64 | break; |
65 | case NFT_META_IIF: | |
66 | if (in == NULL) | |
67 | goto err; | |
fad136ea | 68 | *dest = in->ifindex; |
96518518 PM |
69 | break; |
70 | case NFT_META_OIF: | |
71 | if (out == NULL) | |
72 | goto err; | |
fad136ea | 73 | *dest = out->ifindex; |
96518518 PM |
74 | break; |
75 | case NFT_META_IIFNAME: | |
76 | if (in == NULL) | |
77 | goto err; | |
fad136ea | 78 | strncpy((char *)dest, in->name, IFNAMSIZ); |
96518518 PM |
79 | break; |
80 | case NFT_META_OIFNAME: | |
81 | if (out == NULL) | |
82 | goto err; | |
fad136ea | 83 | strncpy((char *)dest, out->name, IFNAMSIZ); |
96518518 PM |
84 | break; |
85 | case NFT_META_IIFTYPE: | |
86 | if (in == NULL) | |
87 | goto err; | |
49499c3e | 88 | *dest = 0; |
fad136ea | 89 | *(u16 *)dest = in->type; |
96518518 PM |
90 | break; |
91 | case NFT_META_OIFTYPE: | |
92 | if (out == NULL) | |
93 | goto err; | |
49499c3e | 94 | *dest = 0; |
fad136ea | 95 | *(u16 *)dest = out->type; |
96518518 PM |
96 | break; |
97 | case NFT_META_SKUID: | |
3aed8225 ED |
98 | sk = skb_to_full_sk(skb); |
99 | if (!sk || !sk_fullsock(sk)) | |
96518518 PM |
100 | goto err; |
101 | ||
3aed8225 ED |
102 | read_lock_bh(&sk->sk_callback_lock); |
103 | if (sk->sk_socket == NULL || | |
104 | sk->sk_socket->file == NULL) { | |
105 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
106 | goto err; |
107 | } | |
108 | ||
fad136ea | 109 | *dest = from_kuid_munged(&init_user_ns, |
3aed8225 ED |
110 | sk->sk_socket->file->f_cred->fsuid); |
111 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
112 | break; |
113 | case NFT_META_SKGID: | |
3aed8225 ED |
114 | sk = skb_to_full_sk(skb); |
115 | if (!sk || !sk_fullsock(sk)) | |
96518518 PM |
116 | goto err; |
117 | ||
3aed8225 ED |
118 | read_lock_bh(&sk->sk_callback_lock); |
119 | if (sk->sk_socket == NULL || | |
120 | sk->sk_socket->file == NULL) { | |
121 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 PM |
122 | goto err; |
123 | } | |
fad136ea | 124 | *dest = from_kgid_munged(&init_user_ns, |
3aed8225 ED |
125 | sk->sk_socket->file->f_cred->fsgid); |
126 | read_unlock_bh(&sk->sk_callback_lock); | |
96518518 | 127 | break; |
06efbd6d | 128 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
129 | case NFT_META_RTCLASSID: { |
130 | const struct dst_entry *dst = skb_dst(skb); | |
131 | ||
132 | if (dst == NULL) | |
133 | goto err; | |
fad136ea | 134 | *dest = dst->tclassid; |
96518518 PM |
135 | break; |
136 | } | |
137 | #endif | |
138 | #ifdef CONFIG_NETWORK_SECMARK | |
139 | case NFT_META_SECMARK: | |
fad136ea | 140 | *dest = skb->secmark; |
96518518 PM |
141 | break; |
142 | #endif | |
e2a093ff AR |
143 | case NFT_META_PKTTYPE: |
144 | if (skb->pkt_type != PACKET_LOOPBACK) { | |
fad136ea | 145 | *dest = skb->pkt_type; |
e2a093ff AR |
146 | break; |
147 | } | |
148 | ||
6aa187f2 | 149 | switch (pkt->pf) { |
e2a093ff AR |
150 | case NFPROTO_IPV4: |
151 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) | |
fad136ea | 152 | *dest = PACKET_MULTICAST; |
e2a093ff | 153 | else |
fad136ea | 154 | *dest = PACKET_BROADCAST; |
e2a093ff AR |
155 | break; |
156 | case NFPROTO_IPV6: | |
157 | if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF) | |
fad136ea | 158 | *dest = PACKET_MULTICAST; |
e2a093ff | 159 | else |
fad136ea | 160 | *dest = PACKET_BROADCAST; |
e2a093ff AR |
161 | break; |
162 | default: | |
163 | WARN_ON(1); | |
164 | goto err; | |
165 | } | |
166 | break; | |
afc5be30 | 167 | case NFT_META_CPU: |
fad136ea | 168 | *dest = raw_smp_processor_id(); |
afc5be30 | 169 | break; |
3045d760 AR |
170 | case NFT_META_IIFGROUP: |
171 | if (in == NULL) | |
172 | goto err; | |
fad136ea | 173 | *dest = in->group; |
3045d760 AR |
174 | break; |
175 | case NFT_META_OIFGROUP: | |
176 | if (out == NULL) | |
177 | goto err; | |
fad136ea | 178 | *dest = out->group; |
3045d760 | 179 | break; |
e181a543 | 180 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 181 | case NFT_META_CGROUP: |
3aed8225 ED |
182 | sk = skb_to_full_sk(skb); |
183 | if (!sk || !sk_fullsock(sk)) | |
c5035c77 | 184 | goto err; |
2a56a1fe | 185 | *dest = sock_cgroup_classid(&sk->sk_cgrp_data); |
ce674173 | 186 | break; |
e181a543 | 187 | #endif |
b07edbe1 FW |
188 | case NFT_META_PRANDOM: { |
189 | struct rnd_state *state = this_cpu_ptr(&nft_prandom_state); | |
190 | *dest = prandom_u32_state(state); | |
191 | break; | |
192 | } | |
96518518 PM |
193 | default: |
194 | WARN_ON(1); | |
195 | goto err; | |
196 | } | |
197 | return; | |
198 | ||
199 | err: | |
a55e22e9 | 200 | regs->verdict.code = NFT_BREAK; |
96518518 | 201 | } |
aa45660c | 202 | EXPORT_SYMBOL_GPL(nft_meta_get_eval); |
96518518 | 203 | |
aa45660c | 204 | void nft_meta_set_eval(const struct nft_expr *expr, |
a55e22e9 | 205 | struct nft_regs *regs, |
aa45660c | 206 | const struct nft_pktinfo *pkt) |
e035b77a ABG |
207 | { |
208 | const struct nft_meta *meta = nft_expr_priv(expr); | |
209 | struct sk_buff *skb = pkt->skb; | |
49499c3e | 210 | u32 value = regs->data[meta->sreg]; |
e035b77a ABG |
211 | |
212 | switch (meta->key) { | |
213 | case NFT_META_MARK: | |
214 | skb->mark = value; | |
215 | break; | |
216 | case NFT_META_PRIORITY: | |
217 | skb->priority = value; | |
218 | break; | |
b4aae759 FW |
219 | case NFT_META_PKTTYPE: |
220 | if (skb->pkt_type != value && | |
8b10cab6 | 221 | skb_pkt_type_ok(value) && skb_pkt_type_ok(skb->pkt_type)) |
b4aae759 FW |
222 | skb->pkt_type = value; |
223 | break; | |
e035b77a | 224 | case NFT_META_NFTRACE: |
62131e5d | 225 | skb->nf_trace = !!value; |
e035b77a ABG |
226 | break; |
227 | default: | |
228 | WARN_ON(1); | |
229 | } | |
230 | } | |
aa45660c | 231 | EXPORT_SYMBOL_GPL(nft_meta_set_eval); |
e035b77a | 232 | |
aa45660c | 233 | const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { |
96518518 PM |
234 | [NFTA_META_DREG] = { .type = NLA_U32 }, |
235 | [NFTA_META_KEY] = { .type = NLA_U32 }, | |
e035b77a | 236 | [NFTA_META_SREG] = { .type = NLA_U32 }, |
96518518 | 237 | }; |
aa45660c | 238 | EXPORT_SYMBOL_GPL(nft_meta_policy); |
96518518 | 239 | |
aa45660c TB |
240 | int nft_meta_get_init(const struct nft_ctx *ctx, |
241 | const struct nft_expr *expr, | |
242 | const struct nlattr * const tb[]) | |
96518518 | 243 | { |
d2caa696 | 244 | struct nft_meta *priv = nft_expr_priv(expr); |
45d9bcda | 245 | unsigned int len; |
96518518 | 246 | |
d2caa696 PM |
247 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); |
248 | switch (priv->key) { | |
96518518 | 249 | case NFT_META_PROTOCOL: |
45d9bcda PM |
250 | case NFT_META_IIFTYPE: |
251 | case NFT_META_OIFTYPE: | |
252 | len = sizeof(u16); | |
253 | break; | |
124edfa9 | 254 | case NFT_META_NFPROTO: |
4566bf27 | 255 | case NFT_META_L4PROTO: |
45d9bcda | 256 | case NFT_META_LEN: |
96518518 PM |
257 | case NFT_META_PRIORITY: |
258 | case NFT_META_MARK: | |
259 | case NFT_META_IIF: | |
260 | case NFT_META_OIF: | |
96518518 PM |
261 | case NFT_META_SKUID: |
262 | case NFT_META_SKGID: | |
06efbd6d | 263 | #ifdef CONFIG_IP_ROUTE_CLASSID |
96518518 PM |
264 | case NFT_META_RTCLASSID: |
265 | #endif | |
266 | #ifdef CONFIG_NETWORK_SECMARK | |
267 | case NFT_META_SECMARK: | |
268 | #endif | |
e2a093ff | 269 | case NFT_META_PKTTYPE: |
afc5be30 | 270 | case NFT_META_CPU: |
3045d760 AR |
271 | case NFT_META_IIFGROUP: |
272 | case NFT_META_OIFGROUP: | |
e181a543 | 273 | #ifdef CONFIG_CGROUP_NET_CLASSID |
ce674173 | 274 | case NFT_META_CGROUP: |
e181a543 | 275 | #endif |
45d9bcda PM |
276 | len = sizeof(u32); |
277 | break; | |
278 | case NFT_META_IIFNAME: | |
279 | case NFT_META_OIFNAME: | |
280 | len = IFNAMSIZ; | |
d2caa696 | 281 | break; |
b07edbe1 FW |
282 | case NFT_META_PRANDOM: |
283 | prandom_init_once(&nft_prandom_state); | |
284 | len = sizeof(u32); | |
285 | break; | |
96518518 PM |
286 | default: |
287 | return -EOPNOTSUPP; | |
288 | } | |
289 | ||
b1c96ed3 | 290 | priv->dreg = nft_parse_register(tb[NFTA_META_DREG]); |
27e6d201 PM |
291 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
292 | NFT_DATA_VALUE, len); | |
e035b77a | 293 | } |
aa45660c | 294 | EXPORT_SYMBOL_GPL(nft_meta_get_init); |
e035b77a | 295 | |
960fa72f LZ |
296 | int nft_meta_set_validate(const struct nft_ctx *ctx, |
297 | const struct nft_expr *expr, | |
298 | const struct nft_data **data) | |
b4aae759 | 299 | { |
960fa72f | 300 | struct nft_meta *priv = nft_expr_priv(expr); |
b4aae759 FW |
301 | unsigned int hooks; |
302 | ||
960fa72f LZ |
303 | if (priv->key != NFT_META_PKTTYPE) |
304 | return 0; | |
305 | ||
b4aae759 FW |
306 | switch (ctx->afi->family) { |
307 | case NFPROTO_BRIDGE: | |
308 | hooks = 1 << NF_BR_PRE_ROUTING; | |
309 | break; | |
310 | case NFPROTO_NETDEV: | |
311 | hooks = 1 << NF_NETDEV_INGRESS; | |
312 | break; | |
96d9f2a7 LZ |
313 | case NFPROTO_IPV4: |
314 | case NFPROTO_IPV6: | |
315 | case NFPROTO_INET: | |
316 | hooks = 1 << NF_INET_PRE_ROUTING; | |
317 | break; | |
b4aae759 FW |
318 | default: |
319 | return -EOPNOTSUPP; | |
320 | } | |
321 | ||
322 | return nft_chain_validate_hooks(ctx->chain, hooks); | |
323 | } | |
960fa72f | 324 | EXPORT_SYMBOL_GPL(nft_meta_set_validate); |
b4aae759 | 325 | |
aa45660c TB |
326 | int nft_meta_set_init(const struct nft_ctx *ctx, |
327 | const struct nft_expr *expr, | |
328 | const struct nlattr * const tb[]) | |
e035b77a ABG |
329 | { |
330 | struct nft_meta *priv = nft_expr_priv(expr); | |
d07db988 | 331 | unsigned int len; |
e035b77a ABG |
332 | int err; |
333 | ||
334 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
d2caa696 PM |
335 | switch (priv->key) { |
336 | case NFT_META_MARK: | |
337 | case NFT_META_PRIORITY: | |
d07db988 PM |
338 | len = sizeof(u32); |
339 | break; | |
d2caa696 | 340 | case NFT_META_NFTRACE: |
d07db988 | 341 | len = sizeof(u8); |
d2caa696 | 342 | break; |
b4aae759 | 343 | case NFT_META_PKTTYPE: |
b4aae759 FW |
344 | len = sizeof(u8); |
345 | break; | |
d2caa696 PM |
346 | default: |
347 | return -EOPNOTSUPP; | |
e035b77a ABG |
348 | } |
349 | ||
960fa72f LZ |
350 | err = nft_meta_set_validate(ctx, expr, NULL); |
351 | if (err < 0) | |
352 | return err; | |
353 | ||
b1c96ed3 | 354 | priv->sreg = nft_parse_register(tb[NFTA_META_SREG]); |
d07db988 | 355 | err = nft_validate_register_load(priv->sreg, len); |
b38895c5 PNA |
356 | if (err < 0) |
357 | return err; | |
e035b77a | 358 | |
e639f7ab FW |
359 | if (priv->key == NFT_META_NFTRACE) |
360 | static_branch_inc(&nft_trace_enabled); | |
361 | ||
e035b77a | 362 | return 0; |
96518518 | 363 | } |
aa45660c | 364 | EXPORT_SYMBOL_GPL(nft_meta_set_init); |
96518518 | 365 | |
aa45660c TB |
366 | int nft_meta_get_dump(struct sk_buff *skb, |
367 | const struct nft_expr *expr) | |
96518518 PM |
368 | { |
369 | const struct nft_meta *priv = nft_expr_priv(expr); | |
370 | ||
e035b77a ABG |
371 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
372 | goto nla_put_failure; | |
b1c96ed3 | 373 | if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg)) |
96518518 | 374 | goto nla_put_failure; |
e035b77a ABG |
375 | return 0; |
376 | ||
377 | nla_put_failure: | |
378 | return -1; | |
379 | } | |
aa45660c | 380 | EXPORT_SYMBOL_GPL(nft_meta_get_dump); |
e035b77a | 381 | |
aa45660c TB |
382 | int nft_meta_set_dump(struct sk_buff *skb, |
383 | const struct nft_expr *expr) | |
e035b77a ABG |
384 | { |
385 | const struct nft_meta *priv = nft_expr_priv(expr); | |
386 | ||
96518518 PM |
387 | if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key))) |
388 | goto nla_put_failure; | |
b1c96ed3 | 389 | if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg)) |
e035b77a ABG |
390 | goto nla_put_failure; |
391 | ||
96518518 PM |
392 | return 0; |
393 | ||
394 | nla_put_failure: | |
395 | return -1; | |
396 | } | |
aa45660c | 397 | EXPORT_SYMBOL_GPL(nft_meta_set_dump); |
96518518 | 398 | |
e639f7ab FW |
399 | void nft_meta_set_destroy(const struct nft_ctx *ctx, |
400 | const struct nft_expr *expr) | |
401 | { | |
402 | const struct nft_meta *priv = nft_expr_priv(expr); | |
403 | ||
404 | if (priv->key == NFT_META_NFTRACE) | |
405 | static_branch_dec(&nft_trace_enabled); | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(nft_meta_set_destroy); | |
408 | ||
ef1f7df9 | 409 | static struct nft_expr_type nft_meta_type; |
e035b77a | 410 | static const struct nft_expr_ops nft_meta_get_ops = { |
ef1f7df9 | 411 | .type = &nft_meta_type, |
96518518 | 412 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), |
e035b77a | 413 | .eval = nft_meta_get_eval, |
d2caa696 | 414 | .init = nft_meta_get_init, |
e035b77a | 415 | .dump = nft_meta_get_dump, |
ef1f7df9 PM |
416 | }; |
417 | ||
e035b77a ABG |
418 | static const struct nft_expr_ops nft_meta_set_ops = { |
419 | .type = &nft_meta_type, | |
420 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
421 | .eval = nft_meta_set_eval, | |
d2caa696 | 422 | .init = nft_meta_set_init, |
e639f7ab | 423 | .destroy = nft_meta_set_destroy, |
e035b77a | 424 | .dump = nft_meta_set_dump, |
960fa72f | 425 | .validate = nft_meta_set_validate, |
e035b77a ABG |
426 | }; |
427 | ||
428 | static const struct nft_expr_ops * | |
429 | nft_meta_select_ops(const struct nft_ctx *ctx, | |
430 | const struct nlattr * const tb[]) | |
431 | { | |
432 | if (tb[NFTA_META_KEY] == NULL) | |
433 | return ERR_PTR(-EINVAL); | |
434 | ||
435 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
436 | return ERR_PTR(-EINVAL); | |
437 | ||
438 | if (tb[NFTA_META_DREG]) | |
439 | return &nft_meta_get_ops; | |
440 | ||
441 | if (tb[NFTA_META_SREG]) | |
442 | return &nft_meta_set_ops; | |
443 | ||
444 | return ERR_PTR(-EINVAL); | |
445 | } | |
446 | ||
ef1f7df9 PM |
447 | static struct nft_expr_type nft_meta_type __read_mostly = { |
448 | .name = "meta", | |
e035b77a | 449 | .select_ops = &nft_meta_select_ops, |
96518518 PM |
450 | .policy = nft_meta_policy, |
451 | .maxattr = NFTA_META_MAX, | |
ef1f7df9 | 452 | .owner = THIS_MODULE, |
96518518 PM |
453 | }; |
454 | ||
455 | static int __init nft_meta_module_init(void) | |
456 | { | |
ef1f7df9 | 457 | return nft_register_expr(&nft_meta_type); |
96518518 PM |
458 | } |
459 | ||
460 | static void __exit nft_meta_module_exit(void) | |
461 | { | |
ef1f7df9 | 462 | nft_unregister_expr(&nft_meta_type); |
96518518 PM |
463 | } |
464 | ||
465 | module_init(nft_meta_module_init); | |
466 | module_exit(nft_meta_module_exit); | |
467 | ||
468 | MODULE_LICENSE("GPL"); | |
469 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
470 | MODULE_ALIAS_NFT_EXPR("meta"); |