2 * (C) 1999-2001 Paul `Rusty' Russell
3 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
4 * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6
11 * NAT funded by Astaro.
15 #include <linux/inetdevice.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter.h>
21 #include <linux/types.h>
22 #include <linux/netfilter_ipv4.h>
23 #include <linux/netfilter_ipv6.h>
24 #include <linux/netfilter/x_tables.h>
25 #include <net/addrconf.h>
26 #include <net/checksum.h>
27 #include <net/protocol.h>
28 #include <net/netfilter/nf_nat.h>
29 #include <net/netfilter/nf_nat_redirect.h>
32 redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par)
34 return nf_nat_redirect_ipv6(skb, par->targinfo, par->hooknum);
37 static int redirect_tg6_checkentry(const struct xt_tgchk_param *par)
39 const struct nf_nat_range *range = par->targinfo;
41 if (range->flags & NF_NAT_RANGE_MAP_IPS)
46 /* FIXME: Take multiple ranges --RR */
47 static int redirect_tg4_check(const struct xt_tgchk_param *par)
49 const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
51 if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) {
52 pr_debug("bad MAP_IPS.\n");
55 if (mr->rangesize != 1) {
56 pr_debug("bad rangesize %u.\n", mr->rangesize);
63 redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par)
65 return nf_nat_redirect_ipv4(skb, par->targinfo, par->hooknum);
68 static struct xt_target redirect_tg_reg[] __read_mostly = {
71 .family = NFPROTO_IPV6,
74 .checkentry = redirect_tg6_checkentry,
75 .target = redirect_tg6,
76 .targetsize = sizeof(struct nf_nat_range),
77 .hooks = (1 << NF_INET_PRE_ROUTING) |
78 (1 << NF_INET_LOCAL_OUT),
83 .family = NFPROTO_IPV4,
86 .target = redirect_tg4,
87 .checkentry = redirect_tg4_check,
88 .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
89 .hooks = (1 << NF_INET_PRE_ROUTING) |
90 (1 << NF_INET_LOCAL_OUT),
95 static int __init redirect_tg_init(void)
97 return xt_register_targets(redirect_tg_reg,
98 ARRAY_SIZE(redirect_tg_reg));
101 static void __exit redirect_tg_exit(void)
103 xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg));
106 module_init(redirect_tg_init);
107 module_exit(redirect_tg_exit);
109 MODULE_LICENSE("GPL");
110 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
111 MODULE_DESCRIPTION("Xtables: Connection redirection to localhost");
112 MODULE_ALIAS("ip6t_REDIRECT");
113 MODULE_ALIAS("ipt_REDIRECT");