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>
23 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
24 #include <net/netfilter/nf_tables.h>
25 #include <net/netfilter/nft_meta.h>
27 void nft_meta_get_eval(const struct nft_expr *expr,
28 struct nft_regs *regs,
29 const struct nft_pktinfo *pkt)
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 u32 *dest = ®s->data[priv->dreg];
40 case NFT_META_PROTOCOL:
42 *(__be16 *)dest = skb->protocol;
44 case NFT_META_NFPROTO:
47 case NFT_META_L4PROTO:
50 case NFT_META_PRIORITY:
51 *dest = skb->priority;
66 case NFT_META_IIFNAME:
69 strncpy((char *)dest, in->name, IFNAMSIZ);
71 case NFT_META_OIFNAME:
74 strncpy((char *)dest, out->name, IFNAMSIZ);
76 case NFT_META_IIFTYPE:
80 *(u16 *)dest = in->type;
82 case NFT_META_OIFTYPE:
86 *(u16 *)dest = out->type;
89 if (skb->sk == NULL || !sk_fullsock(skb->sk))
92 read_lock_bh(&skb->sk->sk_callback_lock);
93 if (skb->sk->sk_socket == NULL ||
94 skb->sk->sk_socket->file == NULL) {
95 read_unlock_bh(&skb->sk->sk_callback_lock);
99 *dest = from_kuid_munged(&init_user_ns,
100 skb->sk->sk_socket->file->f_cred->fsuid);
101 read_unlock_bh(&skb->sk->sk_callback_lock);
104 if (skb->sk == NULL || !sk_fullsock(skb->sk))
107 read_lock_bh(&skb->sk->sk_callback_lock);
108 if (skb->sk->sk_socket == NULL ||
109 skb->sk->sk_socket->file == NULL) {
110 read_unlock_bh(&skb->sk->sk_callback_lock);
113 *dest = from_kgid_munged(&init_user_ns,
114 skb->sk->sk_socket->file->f_cred->fsgid);
115 read_unlock_bh(&skb->sk->sk_callback_lock);
117 #ifdef CONFIG_IP_ROUTE_CLASSID
118 case NFT_META_RTCLASSID: {
119 const struct dst_entry *dst = skb_dst(skb);
123 *dest = dst->tclassid;
127 #ifdef CONFIG_NETWORK_SECMARK
128 case NFT_META_SECMARK:
129 *dest = skb->secmark;
132 case NFT_META_PKTTYPE:
133 if (skb->pkt_type != PACKET_LOOPBACK) {
134 *dest = skb->pkt_type;
138 switch (pkt->ops->pf) {
140 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
141 *dest = PACKET_MULTICAST;
143 *dest = PACKET_BROADCAST;
146 if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
147 *dest = PACKET_MULTICAST;
149 *dest = PACKET_BROADCAST;
157 *dest = raw_smp_processor_id();
159 case NFT_META_IIFGROUP:
164 case NFT_META_OIFGROUP:
169 case NFT_META_CGROUP:
170 if (skb->sk == NULL || !sk_fullsock(skb->sk))
172 *dest = skb->sk->sk_classid;
181 regs->verdict.code = NFT_BREAK;
183 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
185 void nft_meta_set_eval(const struct nft_expr *expr,
186 struct nft_regs *regs,
187 const struct nft_pktinfo *pkt)
189 const struct nft_meta *meta = nft_expr_priv(expr);
190 struct sk_buff *skb = pkt->skb;
191 u32 value = regs->data[meta->sreg];
197 case NFT_META_PRIORITY:
198 skb->priority = value;
200 case NFT_META_NFTRACE:
207 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
209 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
210 [NFTA_META_DREG] = { .type = NLA_U32 },
211 [NFTA_META_KEY] = { .type = NLA_U32 },
212 [NFTA_META_SREG] = { .type = NLA_U32 },
214 EXPORT_SYMBOL_GPL(nft_meta_policy);
216 int nft_meta_get_init(const struct nft_ctx *ctx,
217 const struct nft_expr *expr,
218 const struct nlattr * const tb[])
220 struct nft_meta *priv = nft_expr_priv(expr);
223 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
225 case NFT_META_PROTOCOL:
226 case NFT_META_IIFTYPE:
227 case NFT_META_OIFTYPE:
230 case NFT_META_NFPROTO:
231 case NFT_META_L4PROTO:
233 case NFT_META_PRIORITY:
239 #ifdef CONFIG_IP_ROUTE_CLASSID
240 case NFT_META_RTCLASSID:
242 #ifdef CONFIG_NETWORK_SECMARK
243 case NFT_META_SECMARK:
245 case NFT_META_PKTTYPE:
247 case NFT_META_IIFGROUP:
248 case NFT_META_OIFGROUP:
249 case NFT_META_CGROUP:
252 case NFT_META_IIFNAME:
253 case NFT_META_OIFNAME:
260 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
261 return nft_validate_register_store(ctx, priv->dreg, NULL,
262 NFT_DATA_VALUE, len);
264 EXPORT_SYMBOL_GPL(nft_meta_get_init);
266 int nft_meta_set_init(const struct nft_ctx *ctx,
267 const struct nft_expr *expr,
268 const struct nlattr * const tb[])
270 struct nft_meta *priv = nft_expr_priv(expr);
274 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
277 case NFT_META_PRIORITY:
280 case NFT_META_NFTRACE:
287 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
288 err = nft_validate_register_load(priv->sreg, len);
294 EXPORT_SYMBOL_GPL(nft_meta_set_init);
296 int nft_meta_get_dump(struct sk_buff *skb,
297 const struct nft_expr *expr)
299 const struct nft_meta *priv = nft_expr_priv(expr);
301 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
302 goto nla_put_failure;
303 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
304 goto nla_put_failure;
310 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
312 int nft_meta_set_dump(struct sk_buff *skb,
313 const struct nft_expr *expr)
315 const struct nft_meta *priv = nft_expr_priv(expr);
317 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
318 goto nla_put_failure;
319 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
320 goto nla_put_failure;
327 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
329 static struct nft_expr_type nft_meta_type;
330 static const struct nft_expr_ops nft_meta_get_ops = {
331 .type = &nft_meta_type,
332 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
333 .eval = nft_meta_get_eval,
334 .init = nft_meta_get_init,
335 .dump = nft_meta_get_dump,
338 static const struct nft_expr_ops nft_meta_set_ops = {
339 .type = &nft_meta_type,
340 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
341 .eval = nft_meta_set_eval,
342 .init = nft_meta_set_init,
343 .dump = nft_meta_set_dump,
346 static const struct nft_expr_ops *
347 nft_meta_select_ops(const struct nft_ctx *ctx,
348 const struct nlattr * const tb[])
350 if (tb[NFTA_META_KEY] == NULL)
351 return ERR_PTR(-EINVAL);
353 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
354 return ERR_PTR(-EINVAL);
356 if (tb[NFTA_META_DREG])
357 return &nft_meta_get_ops;
359 if (tb[NFTA_META_SREG])
360 return &nft_meta_set_ops;
362 return ERR_PTR(-EINVAL);
365 static struct nft_expr_type nft_meta_type __read_mostly = {
367 .select_ops = &nft_meta_select_ops,
368 .policy = nft_meta_policy,
369 .maxattr = NFTA_META_MAX,
370 .owner = THIS_MODULE,
373 static int __init nft_meta_module_init(void)
375 return nft_register_expr(&nft_meta_type);
378 static void __exit nft_meta_module_exit(void)
380 nft_unregister_expr(&nft_meta_type);
383 module_init(nft_meta_module_init);
384 module_exit(nft_meta_module_exit);
386 MODULE_LICENSE("GPL");
387 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
388 MODULE_ALIAS_NFT_EXPR("meta");