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Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6
[net-next-2.6.git] / net / netfilter / nf_tproxy_core.c
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1/*
2 * Transparent proxy support for Linux/iptables
3 *
4 * Copyright (c) 2006-2007 BalaBit IT Ltd.
5 * Author: Balazs Scheidler, Krisztian Kovacs
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
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13#include <linux/module.h>
14
15#include <linux/net.h>
16#include <linux/if.h>
17#include <linux/netdevice.h>
18#include <net/udp.h>
19#include <net/netfilter/nf_tproxy_core.h>
20
21struct sock *
22nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
23 const __be32 saddr, const __be32 daddr,
24 const __be16 sport, const __be16 dport,
25 const struct net_device *in, bool listening_only)
26{
27 struct sock *sk;
28
29 /* look up socket */
30 switch (protocol) {
31 case IPPROTO_TCP:
32 if (listening_only)
33 sk = __inet_lookup_listener(net, &tcp_hashinfo,
34 daddr, ntohs(dport),
35 in->ifindex);
36 else
37 sk = __inet_lookup(net, &tcp_hashinfo,
38 saddr, sport, daddr, dport,
39 in->ifindex);
40 break;
41 case IPPROTO_UDP:
42 sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
43 in->ifindex);
44 break;
45 default:
46 WARN_ON(1);
47 sk = NULL;
48 }
49
50 pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, listener only: %d, sock %p\n",
51 protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), listening_only, sk);
52
53 return sk;
54}
55EXPORT_SYMBOL_GPL(nf_tproxy_get_sock_v4);
56
57static void
58nf_tproxy_destructor(struct sk_buff *skb)
59{
60 struct sock *sk = skb->sk;
61
62 skb->sk = NULL;
63 skb->destructor = NULL;
64
65 if (sk)
66 nf_tproxy_put_sock(sk);
67}
68
69/* consumes sk */
70int
71nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
72{
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73 bool transparent = (sk->sk_state == TCP_TIME_WAIT) ?
74 inet_twsk(sk)->tw_transparent :
75 inet_sk(sk)->transparent;
76
77 if (transparent) {
9a279bcb 78 skb_orphan(skb);
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79 skb->sk = sk;
80 skb->destructor = nf_tproxy_destructor;
81 return 1;
82 } else
83 nf_tproxy_put_sock(sk);
84
85 return 0;
86}
87EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
88
89static int __init nf_tproxy_init(void)
90{
91 pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0\n");
92 pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.\n");
93 return 0;
94}
95
96module_init(nf_tproxy_init);
97
98MODULE_LICENSE("GPL");
99MODULE_AUTHOR("Krisztian Kovacs");
100MODULE_DESCRIPTION("Transparent proxy support core routines");