2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
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>
19 #include <linux/ipv6.h>
20 #include <linux/smp.h>
21 #include <linux/static_key.h>
24 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
25 #include <net/netfilter/nf_tables.h>
26 #include <net/netfilter/nf_tables_core.h>
27 #include <net/netfilter/nft_meta.h>
29 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
31 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
33 void nft_meta_get_eval(const struct nft_expr *expr,
34 struct nft_regs *regs,
35 const struct nft_pktinfo *pkt)
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;
41 u32 *dest = ®s->data[priv->dreg];
47 case NFT_META_PROTOCOL:
49 *(__be16 *)dest = skb->protocol;
51 case NFT_META_NFPROTO:
54 case NFT_META_L4PROTO:
59 case NFT_META_PRIORITY:
60 *dest = skb->priority;
75 case NFT_META_IIFNAME:
78 strncpy((char *)dest, in->name, IFNAMSIZ);
80 case NFT_META_OIFNAME:
83 strncpy((char *)dest, out->name, IFNAMSIZ);
85 case NFT_META_IIFTYPE:
89 *(u16 *)dest = in->type;
91 case NFT_META_OIFTYPE:
95 *(u16 *)dest = out->type;
98 sk = skb_to_full_sk(skb);
99 if (!sk || !sk_fullsock(sk))
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);
109 *dest = from_kuid_munged(&init_user_ns,
110 sk->sk_socket->file->f_cred->fsuid);
111 read_unlock_bh(&sk->sk_callback_lock);
114 sk = skb_to_full_sk(skb);
115 if (!sk || !sk_fullsock(sk))
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);
124 *dest = from_kgid_munged(&init_user_ns,
125 sk->sk_socket->file->f_cred->fsgid);
126 read_unlock_bh(&sk->sk_callback_lock);
128 #ifdef CONFIG_IP_ROUTE_CLASSID
129 case NFT_META_RTCLASSID: {
130 const struct dst_entry *dst = skb_dst(skb);
134 *dest = dst->tclassid;
138 #ifdef CONFIG_NETWORK_SECMARK
139 case NFT_META_SECMARK:
140 *dest = skb->secmark;
143 case NFT_META_PKTTYPE:
144 if (skb->pkt_type != PACKET_LOOPBACK) {
145 *dest = skb->pkt_type;
151 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
152 *dest = PACKET_MULTICAST;
154 *dest = PACKET_BROADCAST;
157 if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
158 *dest = PACKET_MULTICAST;
160 *dest = PACKET_BROADCAST;
168 *dest = raw_smp_processor_id();
170 case NFT_META_IIFGROUP:
175 case NFT_META_OIFGROUP:
180 #ifdef CONFIG_CGROUP_NET_CLASSID
181 case NFT_META_CGROUP:
182 sk = skb_to_full_sk(skb);
183 if (!sk || !sk_fullsock(sk))
185 *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
188 case NFT_META_PRANDOM: {
189 struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
190 *dest = prandom_u32_state(state);
200 regs->verdict.code = NFT_BREAK;
202 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
204 void nft_meta_set_eval(const struct nft_expr *expr,
205 struct nft_regs *regs,
206 const struct nft_pktinfo *pkt)
208 const struct nft_meta *meta = nft_expr_priv(expr);
209 struct sk_buff *skb = pkt->skb;
210 u32 value = regs->data[meta->sreg];
216 case NFT_META_PRIORITY:
217 skb->priority = value;
219 case NFT_META_PKTTYPE:
220 if (skb->pkt_type != value &&
221 skb_pkt_type_ok(value) && skb_pkt_type_ok(skb->pkt_type))
222 skb->pkt_type = value;
224 case NFT_META_NFTRACE:
225 skb->nf_trace = !!value;
231 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
233 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
234 [NFTA_META_DREG] = { .type = NLA_U32 },
235 [NFTA_META_KEY] = { .type = NLA_U32 },
236 [NFTA_META_SREG] = { .type = NLA_U32 },
238 EXPORT_SYMBOL_GPL(nft_meta_policy);
240 int nft_meta_get_init(const struct nft_ctx *ctx,
241 const struct nft_expr *expr,
242 const struct nlattr * const tb[])
244 struct nft_meta *priv = nft_expr_priv(expr);
247 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
249 case NFT_META_PROTOCOL:
250 case NFT_META_IIFTYPE:
251 case NFT_META_OIFTYPE:
254 case NFT_META_NFPROTO:
255 case NFT_META_L4PROTO:
257 case NFT_META_PRIORITY:
263 #ifdef CONFIG_IP_ROUTE_CLASSID
264 case NFT_META_RTCLASSID:
266 #ifdef CONFIG_NETWORK_SECMARK
267 case NFT_META_SECMARK:
269 case NFT_META_PKTTYPE:
271 case NFT_META_IIFGROUP:
272 case NFT_META_OIFGROUP:
273 #ifdef CONFIG_CGROUP_NET_CLASSID
274 case NFT_META_CGROUP:
278 case NFT_META_IIFNAME:
279 case NFT_META_OIFNAME:
282 case NFT_META_PRANDOM:
283 prandom_init_once(&nft_prandom_state);
290 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
291 return nft_validate_register_store(ctx, priv->dreg, NULL,
292 NFT_DATA_VALUE, len);
294 EXPORT_SYMBOL_GPL(nft_meta_get_init);
296 int nft_meta_set_validate(const struct nft_ctx *ctx,
297 const struct nft_expr *expr,
298 const struct nft_data **data)
300 struct nft_meta *priv = nft_expr_priv(expr);
303 if (priv->key != NFT_META_PKTTYPE)
306 switch (ctx->afi->family) {
308 hooks = 1 << NF_BR_PRE_ROUTING;
311 hooks = 1 << NF_NETDEV_INGRESS;
317 return nft_chain_validate_hooks(ctx->chain, hooks);
319 EXPORT_SYMBOL_GPL(nft_meta_set_validate);
321 int nft_meta_set_init(const struct nft_ctx *ctx,
322 const struct nft_expr *expr,
323 const struct nlattr * const tb[])
325 struct nft_meta *priv = nft_expr_priv(expr);
329 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
332 case NFT_META_PRIORITY:
335 case NFT_META_NFTRACE:
338 case NFT_META_PKTTYPE:
345 err = nft_meta_set_validate(ctx, expr, NULL);
349 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
350 err = nft_validate_register_load(priv->sreg, len);
354 if (priv->key == NFT_META_NFTRACE)
355 static_branch_inc(&nft_trace_enabled);
359 EXPORT_SYMBOL_GPL(nft_meta_set_init);
361 int nft_meta_get_dump(struct sk_buff *skb,
362 const struct nft_expr *expr)
364 const struct nft_meta *priv = nft_expr_priv(expr);
366 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
367 goto nla_put_failure;
368 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
369 goto nla_put_failure;
375 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
377 int nft_meta_set_dump(struct sk_buff *skb,
378 const struct nft_expr *expr)
380 const struct nft_meta *priv = nft_expr_priv(expr);
382 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
383 goto nla_put_failure;
384 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
385 goto nla_put_failure;
392 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
394 void nft_meta_set_destroy(const struct nft_ctx *ctx,
395 const struct nft_expr *expr)
397 const struct nft_meta *priv = nft_expr_priv(expr);
399 if (priv->key == NFT_META_NFTRACE)
400 static_branch_dec(&nft_trace_enabled);
402 EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
404 static struct nft_expr_type nft_meta_type;
405 static const struct nft_expr_ops nft_meta_get_ops = {
406 .type = &nft_meta_type,
407 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
408 .eval = nft_meta_get_eval,
409 .init = nft_meta_get_init,
410 .dump = nft_meta_get_dump,
413 static const struct nft_expr_ops nft_meta_set_ops = {
414 .type = &nft_meta_type,
415 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
416 .eval = nft_meta_set_eval,
417 .init = nft_meta_set_init,
418 .destroy = nft_meta_set_destroy,
419 .dump = nft_meta_set_dump,
420 .validate = nft_meta_set_validate,
423 static const struct nft_expr_ops *
424 nft_meta_select_ops(const struct nft_ctx *ctx,
425 const struct nlattr * const tb[])
427 if (tb[NFTA_META_KEY] == NULL)
428 return ERR_PTR(-EINVAL);
430 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
431 return ERR_PTR(-EINVAL);
433 if (tb[NFTA_META_DREG])
434 return &nft_meta_get_ops;
436 if (tb[NFTA_META_SREG])
437 return &nft_meta_set_ops;
439 return ERR_PTR(-EINVAL);
442 static struct nft_expr_type nft_meta_type __read_mostly = {
444 .select_ops = &nft_meta_select_ops,
445 .policy = nft_meta_policy,
446 .maxattr = NFTA_META_MAX,
447 .owner = THIS_MODULE,
450 static int __init nft_meta_module_init(void)
452 return nft_register_expr(&nft_meta_type);
455 static void __exit nft_meta_module_exit(void)
457 nft_unregister_expr(&nft_meta_type);
460 module_init(nft_meta_module_init);
461 module_exit(nft_meta_module_exit);
463 MODULE_LICENSE("GPL");
464 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
465 MODULE_ALIAS_NFT_EXPR("meta");