96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
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/*
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* Transparent proxy support for Linux/iptables
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*
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* Copyright (c) 2006-2007 BalaBit IT Ltd.
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* Author: Balazs Scheidler, Krisztian Kovacs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/if.h>
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#include <linux/netdevice.h>
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#include <net/udp.h>
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#include <net/netfilter/nf_tproxy_core.h>
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struct sock *
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nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
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const __be32 saddr, const __be32 daddr,
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const __be16 sport, const __be16 dport,
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const struct net_device *in, bool listening_only)
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{
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struct sock *sk;
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/* look up socket */
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switch (protocol) {
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case IPPROTO_TCP:
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if (listening_only)
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sk = __inet_lookup_listener(net, &tcp_hashinfo,
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daddr, ntohs(dport),
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in->ifindex);
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else
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sk = __inet_lookup(net, &tcp_hashinfo,
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saddr, sport, daddr, dport,
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in->ifindex);
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break;
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case IPPROTO_UDP:
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sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
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in->ifindex);
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break;
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default:
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WARN_ON(1);
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sk = NULL;
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}
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pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, listener only: %d, sock %p\n",
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protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), listening_only, sk);
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return sk;
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}
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EXPORT_SYMBOL_GPL(nf_tproxy_get_sock_v4);
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static void
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nf_tproxy_destructor(struct sk_buff *skb)
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{
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struct sock *sk = skb->sk;
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skb->sk = NULL;
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skb->destructor = NULL;
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if (sk)
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nf_tproxy_put_sock(sk);
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}
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/* consumes sk */
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int
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nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
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{
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if (inet_sk(sk)->transparent) {
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skb->sk = sk;
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skb->destructor = nf_tproxy_destructor;
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return 1;
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} else
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nf_tproxy_put_sock(sk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
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static int __init nf_tproxy_init(void)
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{
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pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0\n");
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pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.\n");
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return 0;
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}
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module_init(nf_tproxy_init);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Krisztian Kovacs");
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MODULE_DESCRIPTION("Transparent proxy support core routines");
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