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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 | |
13 | #include <linux/module.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/ip.h> |
16 | #include <net/checksum.h> |
17 | #include <net/udp.h> |
18 | #include <net/inet_sock.h> |
19 | |
20 | #include <linux/netfilter/x_tables.h> |
21 | #include <linux/netfilter_ipv4/ip_tables.h> |
22 | #include <linux/netfilter/xt_TPROXY.h> |
23 | |
24 | #include <net/netfilter/ipv4/nf_defrag_ipv4.h> |
25 | #include <net/netfilter/nf_tproxy_core.h> |
26 | |
27 | static unsigned int |
28 | tproxy_tg(struct sk_buff *skb, const struct xt_target_param *par) |
29 | { |
30 | const struct iphdr *iph = ip_hdr(skb); |
31 | const struct xt_tproxy_target_info *tgi = par->targinfo; |
32 | struct udphdr _hdr, *hp; |
33 | struct sock *sk; |
34 | |
35 | hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); |
36 | if (hp == NULL) |
37 | return NF_DROP; |
38 | |
39 | sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), iph->protocol, |
40 | iph->saddr, tgi->laddr ? tgi->laddr : iph->daddr, |
41 | hp->source, tgi->lport ? tgi->lport : hp->dest, |
42 | par->in, true); |
43 | |
44 | /* NOTE: assign_sock consumes our sk reference */ |
45 | if (sk && nf_tproxy_assign_sock(skb, sk)) { |
46 | /* This should be in a separate target, but we don't do multiple |
47 | targets on the same rule yet */ |
48 | skb->mark = (skb->mark & ~tgi->mark_mask) ^ tgi->mark_value; |
49 | |
50 | pr_debug("redirecting: proto %u %08x:%u -> %08x:%u, mark: %x\n", |
51 | iph->protocol, ntohl(iph->daddr), ntohs(hp->dest), |
52 | ntohl(tgi->laddr), ntohs(tgi->lport), skb->mark); |
53 | return NF_ACCEPT; |
54 | } |
55 | |
56 | pr_debug("no socket, dropping: proto %u %08x:%u -> %08x:%u, mark: %x\n", |
57 | iph->protocol, ntohl(iph->daddr), ntohs(hp->dest), |
58 | ntohl(tgi->laddr), ntohs(tgi->lport), skb->mark); |
59 | return NF_DROP; |
60 | } |
61 | |
62 | static bool tproxy_tg_check(const struct xt_tgchk_param *par) |
63 | { |
64 | const struct ipt_ip *i = par->entryinfo; |
65 | |
66 | if ((i->proto == IPPROTO_TCP || i->proto == IPPROTO_UDP) |
67 | && !(i->invflags & IPT_INV_PROTO)) |
68 | return true; |
69 | |
70 | pr_info("xt_TPROXY: Can be used only in combination with " |
71 | "either -p tcp or -p udp\n"); |
72 | return false; |
73 | } |
74 | |
75 | static struct xt_target tproxy_tg_reg __read_mostly = { |
76 | .name = "TPROXY", |
77 | .family = AF_INET, |
78 | .table = "mangle", |
79 | .target = tproxy_tg, |
80 | .targetsize = sizeof(struct xt_tproxy_target_info), |
81 | .checkentry = tproxy_tg_check, |
82 | .hooks = 1 << NF_INET_PRE_ROUTING, |
83 | .me = THIS_MODULE, |
84 | }; |
85 | |
86 | static int __init tproxy_tg_init(void) |
87 | { |
88 | nf_defrag_ipv4_enable(); |
89 | return xt_register_target(&tproxy_tg_reg); |
90 | } |
91 | |
92 | static void __exit tproxy_tg_exit(void) |
93 | { |
94 | xt_unregister_target(&tproxy_tg_reg); |
95 | } |
96 | |
97 | module_init(tproxy_tg_init); |
98 | module_exit(tproxy_tg_exit); |
99 | MODULE_LICENSE("GPL"); |
100 | MODULE_AUTHOR("Krisztian Kovacs"); |
101 | MODULE_DESCRIPTION("Netfilter transparent proxy (TPROXY) target module."); |
102 | MODULE_ALIAS("ipt_TPROXY"); |
103 |
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