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2cbc78a2 JE |
1 | /* |
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> | |
5 | * | |
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. | |
9 | * | |
10 | * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 | |
11 | * NAT funded by Astaro. | |
12 | */ | |
13 | ||
14 | #include <linux/if.h> | |
15 | #include <linux/inetdevice.h> | |
16 | #include <linux/ip.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> | |
b59eaf9e | 29 | #include <net/netfilter/nf_nat_redirect.h> |
2cbc78a2 JE |
30 | |
31 | static unsigned int | |
32 | redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
33 | { | |
9de920ed | 34 | return nf_nat_redirect_ipv6(skb, par->targinfo, par->hooknum); |
2cbc78a2 JE |
35 | } |
36 | ||
37 | static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) | |
38 | { | |
39 | const struct nf_nat_range *range = par->targinfo; | |
40 | ||
41 | if (range->flags & NF_NAT_RANGE_MAP_IPS) | |
42 | return -EINVAL; | |
43 | return 0; | |
44 | } | |
45 | ||
46 | /* FIXME: Take multiple ranges --RR */ | |
47 | static int redirect_tg4_check(const struct xt_tgchk_param *par) | |
48 | { | |
49 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; | |
50 | ||
51 | if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { | |
52 | pr_debug("bad MAP_IPS.\n"); | |
53 | return -EINVAL; | |
54 | } | |
55 | if (mr->rangesize != 1) { | |
56 | pr_debug("bad rangesize %u.\n", mr->rangesize); | |
57 | return -EINVAL; | |
58 | } | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static unsigned int | |
63 | redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par) | |
64 | { | |
8b13eddf | 65 | return nf_nat_redirect_ipv4(skb, par->targinfo, par->hooknum); |
2cbc78a2 JE |
66 | } |
67 | ||
68 | static struct xt_target redirect_tg_reg[] __read_mostly = { | |
69 | { | |
70 | .name = "REDIRECT", | |
71 | .family = NFPROTO_IPV6, | |
72 | .revision = 0, | |
73 | .table = "nat", | |
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), | |
79 | .me = THIS_MODULE, | |
80 | }, | |
81 | { | |
82 | .name = "REDIRECT", | |
83 | .family = NFPROTO_IPV4, | |
84 | .revision = 0, | |
85 | .table = "nat", | |
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), | |
91 | .me = THIS_MODULE, | |
92 | }, | |
93 | }; | |
94 | ||
95 | static int __init redirect_tg_init(void) | |
96 | { | |
97 | return xt_register_targets(redirect_tg_reg, | |
98 | ARRAY_SIZE(redirect_tg_reg)); | |
99 | } | |
100 | ||
101 | static void __exit redirect_tg_exit(void) | |
102 | { | |
103 | xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg)); | |
104 | } | |
105 | ||
106 | module_init(redirect_tg_init); | |
107 | module_exit(redirect_tg_exit); | |
108 | ||
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"); |