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;
35 u32 *dest = ®s->data[priv->dreg];
41 case NFT_META_PROTOCOL:
43 *(__be16 *)dest = skb->protocol;
45 case NFT_META_NFPROTO:
48 case NFT_META_L4PROTO:
51 case NFT_META_PRIORITY:
52 *dest = skb->priority;
67 case NFT_META_IIFNAME:
70 strncpy((char *)dest, in->name, IFNAMSIZ);
72 case NFT_META_OIFNAME:
75 strncpy((char *)dest, out->name, IFNAMSIZ);
77 case NFT_META_IIFTYPE:
81 *(u16 *)dest = in->type;
83 case NFT_META_OIFTYPE:
87 *(u16 *)dest = out->type;
90 sk = skb_to_full_sk(skb);
91 if (!sk || !sk_fullsock(sk))
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);
101 *dest = from_kuid_munged(&init_user_ns,
102 sk->sk_socket->file->f_cred->fsuid);
103 read_unlock_bh(&sk->sk_callback_lock);
106 sk = skb_to_full_sk(skb);
107 if (!sk || !sk_fullsock(sk))
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);
116 *dest = from_kgid_munged(&init_user_ns,
117 sk->sk_socket->file->f_cred->fsgid);
118 read_unlock_bh(&sk->sk_callback_lock);
120 #ifdef CONFIG_IP_ROUTE_CLASSID
121 case NFT_META_RTCLASSID: {
122 const struct dst_entry *dst = skb_dst(skb);
126 *dest = dst->tclassid;
130 #ifdef CONFIG_NETWORK_SECMARK
131 case NFT_META_SECMARK:
132 *dest = skb->secmark;
135 case NFT_META_PKTTYPE:
136 if (skb->pkt_type != PACKET_LOOPBACK) {
137 *dest = skb->pkt_type;
143 if (ipv4_is_multicast(ip_hdr(skb)->daddr))
144 *dest = PACKET_MULTICAST;
146 *dest = PACKET_BROADCAST;
149 if (ipv6_hdr(skb)->daddr.s6_addr[0] == 0xFF)
150 *dest = PACKET_MULTICAST;
152 *dest = PACKET_BROADCAST;
160 *dest = raw_smp_processor_id();
162 case NFT_META_IIFGROUP:
167 case NFT_META_OIFGROUP:
172 #ifdef CONFIG_CGROUP_NET_CLASSID
173 case NFT_META_CGROUP:
174 sk = skb_to_full_sk(skb);
175 if (!sk || !sk_fullsock(sk))
177 *dest = sk->sk_classid;
187 regs->verdict.code = NFT_BREAK;
189 EXPORT_SYMBOL_GPL(nft_meta_get_eval);
191 void nft_meta_set_eval(const struct nft_expr *expr,
192 struct nft_regs *regs,
193 const struct nft_pktinfo *pkt)
195 const struct nft_meta *meta = nft_expr_priv(expr);
196 struct sk_buff *skb = pkt->skb;
197 u32 value = regs->data[meta->sreg];
203 case NFT_META_PRIORITY:
204 skb->priority = value;
206 case NFT_META_NFTRACE:
213 EXPORT_SYMBOL_GPL(nft_meta_set_eval);
215 const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
216 [NFTA_META_DREG] = { .type = NLA_U32 },
217 [NFTA_META_KEY] = { .type = NLA_U32 },
218 [NFTA_META_SREG] = { .type = NLA_U32 },
220 EXPORT_SYMBOL_GPL(nft_meta_policy);
222 int nft_meta_get_init(const struct nft_ctx *ctx,
223 const struct nft_expr *expr,
224 const struct nlattr * const tb[])
226 struct nft_meta *priv = nft_expr_priv(expr);
229 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
231 case NFT_META_PROTOCOL:
232 case NFT_META_IIFTYPE:
233 case NFT_META_OIFTYPE:
236 case NFT_META_NFPROTO:
237 case NFT_META_L4PROTO:
239 case NFT_META_PRIORITY:
245 #ifdef CONFIG_IP_ROUTE_CLASSID
246 case NFT_META_RTCLASSID:
248 #ifdef CONFIG_NETWORK_SECMARK
249 case NFT_META_SECMARK:
251 case NFT_META_PKTTYPE:
253 case NFT_META_IIFGROUP:
254 case NFT_META_OIFGROUP:
255 #ifdef CONFIG_CGROUP_NET_CLASSID
256 case NFT_META_CGROUP:
260 case NFT_META_IIFNAME:
261 case NFT_META_OIFNAME:
268 priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
269 return nft_validate_register_store(ctx, priv->dreg, NULL,
270 NFT_DATA_VALUE, len);
272 EXPORT_SYMBOL_GPL(nft_meta_get_init);
274 int nft_meta_set_init(const struct nft_ctx *ctx,
275 const struct nft_expr *expr,
276 const struct nlattr * const tb[])
278 struct nft_meta *priv = nft_expr_priv(expr);
282 priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
285 case NFT_META_PRIORITY:
288 case NFT_META_NFTRACE:
295 priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
296 err = nft_validate_register_load(priv->sreg, len);
302 EXPORT_SYMBOL_GPL(nft_meta_set_init);
304 int nft_meta_get_dump(struct sk_buff *skb,
305 const struct nft_expr *expr)
307 const struct nft_meta *priv = nft_expr_priv(expr);
309 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
310 goto nla_put_failure;
311 if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
312 goto nla_put_failure;
318 EXPORT_SYMBOL_GPL(nft_meta_get_dump);
320 int nft_meta_set_dump(struct sk_buff *skb,
321 const struct nft_expr *expr)
323 const struct nft_meta *priv = nft_expr_priv(expr);
325 if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
326 goto nla_put_failure;
327 if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
328 goto nla_put_failure;
335 EXPORT_SYMBOL_GPL(nft_meta_set_dump);
337 static struct nft_expr_type nft_meta_type;
338 static const struct nft_expr_ops nft_meta_get_ops = {
339 .type = &nft_meta_type,
340 .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
341 .eval = nft_meta_get_eval,
342 .init = nft_meta_get_init,
343 .dump = nft_meta_get_dump,
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,
350 .init = nft_meta_set_init,
351 .dump = nft_meta_set_dump,
354 static const struct nft_expr_ops *
355 nft_meta_select_ops(const struct nft_ctx *ctx,
356 const struct nlattr * const tb[])
358 if (tb[NFTA_META_KEY] == NULL)
359 return ERR_PTR(-EINVAL);
361 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
362 return ERR_PTR(-EINVAL);
364 if (tb[NFTA_META_DREG])
365 return &nft_meta_get_ops;
367 if (tb[NFTA_META_SREG])
368 return &nft_meta_set_ops;
370 return ERR_PTR(-EINVAL);
373 static struct nft_expr_type nft_meta_type __read_mostly = {
375 .select_ops = &nft_meta_select_ops,
376 .policy = nft_meta_policy,
377 .maxattr = NFTA_META_MAX,
378 .owner = THIS_MODULE,
381 static int __init nft_meta_module_init(void)
383 return nft_register_expr(&nft_meta_type);
386 static void __exit nft_meta_module_exit(void)
388 nft_unregister_expr(&nft_meta_type);
391 module_init(nft_meta_module_init);
392 module_exit(nft_meta_module_exit);
394 MODULE_LICENSE("GPL");
395 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
396 MODULE_ALIAS_NFT_EXPR("meta");