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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2cbc78a2 JE |
2 | /* |
3 | * (C) 1999-2001 Paul `Rusty' Russell | |
4 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> | |
5 | * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> | |
6 | * | |
2cbc78a2 JE |
7 | * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 |
8 | * NAT funded by Astaro. | |
9 | */ | |
10 | ||
11 | #include <linux/if.h> | |
12 | #include <linux/inetdevice.h> | |
13 | #include <linux/ip.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/netdevice.h> | |
17 | #include <linux/netfilter.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/netfilter_ipv4.h> | |
20 | #include <linux/netfilter_ipv6.h> | |
21 | #include <linux/netfilter/x_tables.h> | |
22 | #include <net/addrconf.h> | |
23 | #include <net/checksum.h> | |
24 | #include <net/protocol.h> | |
25 | #include <net/netfilter/nf_nat.h> | |
b59eaf9e | 26 | #include <net/netfilter/nf_nat_redirect.h> |
2cbc78a2 JE |
27 | |
28 | static unsigned int | |
29 | redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
30 | { | |
613dbd95 | 31 | return nf_nat_redirect_ipv6(skb, par->targinfo, xt_hooknum(par)); |
2cbc78a2 JE |
32 | } |
33 | ||
34 | static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) | |
35 | { | |
2eb0f624 | 36 | const struct nf_nat_range2 *range = par->targinfo; |
2cbc78a2 JE |
37 | |
38 | if (range->flags & NF_NAT_RANGE_MAP_IPS) | |
39 | return -EINVAL; | |
a357b3f8 FW |
40 | |
41 | return nf_ct_netns_get(par->net, par->family); | |
42 | } | |
43 | ||
44 | static void redirect_tg_destroy(const struct xt_tgdtor_param *par) | |
45 | { | |
46 | nf_ct_netns_put(par->net, par->family); | |
2cbc78a2 JE |
47 | } |
48 | ||
2cbc78a2 JE |
49 | static int redirect_tg4_check(const struct xt_tgchk_param *par) |
50 | { | |
51 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; | |
52 | ||
53 | if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { | |
54 | pr_debug("bad MAP_IPS.\n"); | |
55 | return -EINVAL; | |
56 | } | |
57 | if (mr->rangesize != 1) { | |
58 | pr_debug("bad rangesize %u.\n", mr->rangesize); | |
59 | return -EINVAL; | |
60 | } | |
a357b3f8 | 61 | return nf_ct_netns_get(par->net, par->family); |
2cbc78a2 JE |
62 | } |
63 | ||
64 | static unsigned int | |
65 | redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par) | |
66 | { | |
6f56ad1b JS |
67 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; |
68 | struct nf_nat_range2 range = { | |
69 | .flags = mr->range[0].flags, | |
70 | .min_proto = mr->range[0].min, | |
71 | .max_proto = mr->range[0].max, | |
72 | }; | |
73 | ||
74 | return nf_nat_redirect_ipv4(skb, &range, xt_hooknum(par)); | |
2cbc78a2 JE |
75 | } |
76 | ||
77 | static struct xt_target redirect_tg_reg[] __read_mostly = { | |
78 | { | |
79 | .name = "REDIRECT", | |
80 | .family = NFPROTO_IPV6, | |
81 | .revision = 0, | |
82 | .table = "nat", | |
83 | .checkentry = redirect_tg6_checkentry, | |
a357b3f8 | 84 | .destroy = redirect_tg_destroy, |
2cbc78a2 JE |
85 | .target = redirect_tg6, |
86 | .targetsize = sizeof(struct nf_nat_range), | |
87 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
88 | (1 << NF_INET_LOCAL_OUT), | |
89 | .me = THIS_MODULE, | |
90 | }, | |
91 | { | |
92 | .name = "REDIRECT", | |
93 | .family = NFPROTO_IPV4, | |
94 | .revision = 0, | |
95 | .table = "nat", | |
96 | .target = redirect_tg4, | |
97 | .checkentry = redirect_tg4_check, | |
a357b3f8 | 98 | .destroy = redirect_tg_destroy, |
2cbc78a2 JE |
99 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), |
100 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
101 | (1 << NF_INET_LOCAL_OUT), | |
102 | .me = THIS_MODULE, | |
103 | }, | |
104 | }; | |
105 | ||
106 | static int __init redirect_tg_init(void) | |
107 | { | |
108 | return xt_register_targets(redirect_tg_reg, | |
109 | ARRAY_SIZE(redirect_tg_reg)); | |
110 | } | |
111 | ||
112 | static void __exit redirect_tg_exit(void) | |
113 | { | |
114 | xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg)); | |
115 | } | |
116 | ||
117 | module_init(redirect_tg_init); | |
118 | module_exit(redirect_tg_exit); | |
119 | ||
120 | MODULE_LICENSE("GPL"); | |
121 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
122 | MODULE_DESCRIPTION("Xtables: Connection redirection to localhost"); | |
123 | MODULE_ALIAS("ip6t_REDIRECT"); | |
124 | MODULE_ALIAS("ipt_REDIRECT"); |