KOVACS Krisztian | 9ad2d74 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 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 | |
KOVACS Krisztian | 9ad2d74 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 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 | |
| 21 | struct sock * |
| 22 | nf_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 | } |
| 55 | EXPORT_SYMBOL_GPL(nf_tproxy_get_sock_v4); |
| 56 | |
| 57 | static void |
| 58 | nf_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 */ |
| 70 | int |
| 71 | nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk) |
| 72 | { |
| 73 | if (inet_sk(sk)->transparent) { |
Herbert Xu | 9a279bc | 2009-02-04 16:55:27 -0800 | [diff] [blame] | 74 | skb_orphan(skb); |
KOVACS Krisztian | 9ad2d74 | 2008-10-08 11:35:12 +0200 | [diff] [blame] | 75 | skb->sk = sk; |
| 76 | skb->destructor = nf_tproxy_destructor; |
| 77 | return 1; |
| 78 | } else |
| 79 | nf_tproxy_put_sock(sk); |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock); |
| 84 | |
| 85 | static int __init nf_tproxy_init(void) |
| 86 | { |
| 87 | pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0\n"); |
| 88 | pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.\n"); |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | module_init(nf_tproxy_init); |
| 93 | |
| 94 | MODULE_LICENSE("GPL"); |
| 95 | MODULE_AUTHOR("Krisztian Kovacs"); |
| 96 | MODULE_DESCRIPTION("Transparent proxy support core routines"); |