Root/
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> |
29 | |
30 | static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT; |
31 | |
32 | static unsigned int |
33 | redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) |
34 | { |
35 | const struct nf_nat_range *range = par->targinfo; |
36 | struct nf_nat_range newrange; |
37 | struct in6_addr newdst; |
38 | enum ip_conntrack_info ctinfo; |
39 | struct nf_conn *ct; |
40 | |
41 | ct = nf_ct_get(skb, &ctinfo); |
42 | if (par->hooknum == NF_INET_LOCAL_OUT) |
43 | newdst = loopback_addr; |
44 | else { |
45 | struct inet6_dev *idev; |
46 | struct inet6_ifaddr *ifa; |
47 | bool addr = false; |
48 | |
49 | rcu_read_lock(); |
50 | idev = __in6_dev_get(skb->dev); |
51 | if (idev != NULL) { |
52 | list_for_each_entry(ifa, &idev->addr_list, if_list) { |
53 | newdst = ifa->addr; |
54 | addr = true; |
55 | break; |
56 | } |
57 | } |
58 | rcu_read_unlock(); |
59 | |
60 | if (!addr) |
61 | return NF_DROP; |
62 | } |
63 | |
64 | newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; |
65 | newrange.min_addr.in6 = newdst; |
66 | newrange.max_addr.in6 = newdst; |
67 | newrange.min_proto = range->min_proto; |
68 | newrange.max_proto = range->max_proto; |
69 | |
70 | return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); |
71 | } |
72 | |
73 | static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) |
74 | { |
75 | const struct nf_nat_range *range = par->targinfo; |
76 | |
77 | if (range->flags & NF_NAT_RANGE_MAP_IPS) |
78 | return -EINVAL; |
79 | return 0; |
80 | } |
81 | |
82 | /* FIXME: Take multiple ranges --RR */ |
83 | static int redirect_tg4_check(const struct xt_tgchk_param *par) |
84 | { |
85 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; |
86 | |
87 | if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { |
88 | pr_debug("bad MAP_IPS.\n"); |
89 | return -EINVAL; |
90 | } |
91 | if (mr->rangesize != 1) { |
92 | pr_debug("bad rangesize %u.\n", mr->rangesize); |
93 | return -EINVAL; |
94 | } |
95 | return 0; |
96 | } |
97 | |
98 | static unsigned int |
99 | redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par) |
100 | { |
101 | struct nf_conn *ct; |
102 | enum ip_conntrack_info ctinfo; |
103 | __be32 newdst; |
104 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; |
105 | struct nf_nat_range newrange; |
106 | |
107 | NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING || |
108 | par->hooknum == NF_INET_LOCAL_OUT); |
109 | |
110 | ct = nf_ct_get(skb, &ctinfo); |
111 | NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); |
112 | |
113 | /* Local packets: make them go to loopback */ |
114 | if (par->hooknum == NF_INET_LOCAL_OUT) |
115 | newdst = htonl(0x7F000001); |
116 | else { |
117 | struct in_device *indev; |
118 | struct in_ifaddr *ifa; |
119 | |
120 | newdst = 0; |
121 | |
122 | rcu_read_lock(); |
123 | indev = __in_dev_get_rcu(skb->dev); |
124 | if (indev && (ifa = indev->ifa_list)) |
125 | newdst = ifa->ifa_local; |
126 | rcu_read_unlock(); |
127 | |
128 | if (!newdst) |
129 | return NF_DROP; |
130 | } |
131 | |
132 | /* Transfer from original range. */ |
133 | memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); |
134 | memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); |
135 | newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; |
136 | newrange.min_addr.ip = newdst; |
137 | newrange.max_addr.ip = newdst; |
138 | newrange.min_proto = mr->range[0].min; |
139 | newrange.max_proto = mr->range[0].max; |
140 | |
141 | /* Hand modified range to generic setup. */ |
142 | return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); |
143 | } |
144 | |
145 | static struct xt_target redirect_tg_reg[] __read_mostly = { |
146 | { |
147 | .name = "REDIRECT", |
148 | .family = NFPROTO_IPV6, |
149 | .revision = 0, |
150 | .table = "nat", |
151 | .checkentry = redirect_tg6_checkentry, |
152 | .target = redirect_tg6, |
153 | .targetsize = sizeof(struct nf_nat_range), |
154 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
155 | (1 << NF_INET_LOCAL_OUT), |
156 | .me = THIS_MODULE, |
157 | }, |
158 | { |
159 | .name = "REDIRECT", |
160 | .family = NFPROTO_IPV4, |
161 | .revision = 0, |
162 | .table = "nat", |
163 | .target = redirect_tg4, |
164 | .checkentry = redirect_tg4_check, |
165 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), |
166 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
167 | (1 << NF_INET_LOCAL_OUT), |
168 | .me = THIS_MODULE, |
169 | }, |
170 | }; |
171 | |
172 | static int __init redirect_tg_init(void) |
173 | { |
174 | return xt_register_targets(redirect_tg_reg, |
175 | ARRAY_SIZE(redirect_tg_reg)); |
176 | } |
177 | |
178 | static void __exit redirect_tg_exit(void) |
179 | { |
180 | xt_unregister_targets(redirect_tg_reg, ARRAY_SIZE(redirect_tg_reg)); |
181 | } |
182 | |
183 | module_init(redirect_tg_init); |
184 | module_exit(redirect_tg_exit); |
185 | |
186 | MODULE_LICENSE("GPL"); |
187 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
188 | MODULE_DESCRIPTION("Xtables: Connection redirection to localhost"); |
189 | MODULE_ALIAS("ip6t_REDIRECT"); |
190 | MODULE_ALIAS("ipt_REDIRECT"); |
191 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9