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c7232c99 PM |
1 | /* |
2 | * (C) 1999-2001 Paul `Rusty' Russell | |
3 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> | |
4 | * (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 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/netfilter.h> | |
14 | #include <linux/netfilter/x_tables.h> | |
15 | #include <net/netfilter/nf_nat_core.h> | |
16 | ||
17 | static int xt_nat_checkentry_v0(const struct xt_tgchk_param *par) | |
18 | { | |
19 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; | |
20 | ||
21 | if (mr->rangesize != 1) { | |
22 | pr_info("%s: multiple ranges no longer supported\n", | |
23 | par->target->name); | |
24 | return -EINVAL; | |
25 | } | |
a357b3f8 FW |
26 | return nf_ct_netns_get(par->net, par->family); |
27 | } | |
28 | ||
29 | static int xt_nat_checkentry(const struct xt_tgchk_param *par) | |
30 | { | |
31 | return nf_ct_netns_get(par->net, par->family); | |
32 | } | |
33 | ||
34 | static void xt_nat_destroy(const struct xt_tgdtor_param *par) | |
35 | { | |
36 | nf_ct_netns_put(par->net, par->family); | |
c7232c99 PM |
37 | } |
38 | ||
39 | static void xt_nat_convert_range(struct nf_nat_range *dst, | |
40 | const struct nf_nat_ipv4_range *src) | |
41 | { | |
42 | memset(&dst->min_addr, 0, sizeof(dst->min_addr)); | |
43 | memset(&dst->max_addr, 0, sizeof(dst->max_addr)); | |
44 | ||
45 | dst->flags = src->flags; | |
46 | dst->min_addr.ip = src->min_ip; | |
47 | dst->max_addr.ip = src->max_ip; | |
48 | dst->min_proto = src->min; | |
49 | dst->max_proto = src->max; | |
50 | } | |
51 | ||
52 | static unsigned int | |
53 | xt_snat_target_v0(struct sk_buff *skb, const struct xt_action_param *par) | |
54 | { | |
55 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; | |
56 | struct nf_nat_range range; | |
57 | enum ip_conntrack_info ctinfo; | |
58 | struct nf_conn *ct; | |
59 | ||
60 | ct = nf_ct_get(skb, &ctinfo); | |
61 | NF_CT_ASSERT(ct != NULL && | |
62 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED || | |
63 | ctinfo == IP_CT_RELATED_REPLY)); | |
64 | ||
65 | xt_nat_convert_range(&range, &mr->range[0]); | |
66 | return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC); | |
67 | } | |
68 | ||
69 | static unsigned int | |
70 | xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par) | |
71 | { | |
72 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; | |
73 | struct nf_nat_range range; | |
74 | enum ip_conntrack_info ctinfo; | |
75 | struct nf_conn *ct; | |
76 | ||
77 | ct = nf_ct_get(skb, &ctinfo); | |
78 | NF_CT_ASSERT(ct != NULL && | |
79 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); | |
80 | ||
81 | xt_nat_convert_range(&range, &mr->range[0]); | |
82 | return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST); | |
83 | } | |
84 | ||
85 | static unsigned int | |
86 | xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par) | |
87 | { | |
88 | const struct nf_nat_range *range = par->targinfo; | |
89 | enum ip_conntrack_info ctinfo; | |
90 | struct nf_conn *ct; | |
91 | ||
92 | ct = nf_ct_get(skb, &ctinfo); | |
93 | NF_CT_ASSERT(ct != NULL && | |
94 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED || | |
95 | ctinfo == IP_CT_RELATED_REPLY)); | |
96 | ||
97 | return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC); | |
98 | } | |
99 | ||
100 | static unsigned int | |
101 | xt_dnat_target_v1(struct sk_buff *skb, const struct xt_action_param *par) | |
102 | { | |
103 | const struct nf_nat_range *range = par->targinfo; | |
104 | enum ip_conntrack_info ctinfo; | |
105 | struct nf_conn *ct; | |
106 | ||
107 | ct = nf_ct_get(skb, &ctinfo); | |
108 | NF_CT_ASSERT(ct != NULL && | |
109 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); | |
110 | ||
111 | return nf_nat_setup_info(ct, range, NF_NAT_MANIP_DST); | |
112 | } | |
113 | ||
114 | static struct xt_target xt_nat_target_reg[] __read_mostly = { | |
115 | { | |
116 | .name = "SNAT", | |
117 | .revision = 0, | |
118 | .checkentry = xt_nat_checkentry_v0, | |
a357b3f8 | 119 | .destroy = xt_nat_destroy, |
c7232c99 PM |
120 | .target = xt_snat_target_v0, |
121 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), | |
122 | .family = NFPROTO_IPV4, | |
123 | .table = "nat", | |
124 | .hooks = (1 << NF_INET_POST_ROUTING) | | |
939ccba4 | 125 | (1 << NF_INET_LOCAL_IN), |
c7232c99 PM |
126 | .me = THIS_MODULE, |
127 | }, | |
128 | { | |
129 | .name = "DNAT", | |
130 | .revision = 0, | |
131 | .checkentry = xt_nat_checkentry_v0, | |
a357b3f8 | 132 | .destroy = xt_nat_destroy, |
c7232c99 PM |
133 | .target = xt_dnat_target_v0, |
134 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), | |
135 | .family = NFPROTO_IPV4, | |
136 | .table = "nat", | |
137 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
939ccba4 | 138 | (1 << NF_INET_LOCAL_OUT), |
c7232c99 PM |
139 | .me = THIS_MODULE, |
140 | }, | |
141 | { | |
142 | .name = "SNAT", | |
143 | .revision = 1, | |
a357b3f8 FW |
144 | .checkentry = xt_nat_checkentry, |
145 | .destroy = xt_nat_destroy, | |
c7232c99 PM |
146 | .target = xt_snat_target_v1, |
147 | .targetsize = sizeof(struct nf_nat_range), | |
148 | .table = "nat", | |
149 | .hooks = (1 << NF_INET_POST_ROUTING) | | |
939ccba4 | 150 | (1 << NF_INET_LOCAL_IN), |
c7232c99 PM |
151 | .me = THIS_MODULE, |
152 | }, | |
153 | { | |
154 | .name = "DNAT", | |
155 | .revision = 1, | |
a357b3f8 FW |
156 | .checkentry = xt_nat_checkentry, |
157 | .destroy = xt_nat_destroy, | |
c7232c99 PM |
158 | .target = xt_dnat_target_v1, |
159 | .targetsize = sizeof(struct nf_nat_range), | |
160 | .table = "nat", | |
161 | .hooks = (1 << NF_INET_PRE_ROUTING) | | |
939ccba4 | 162 | (1 << NF_INET_LOCAL_OUT), |
c7232c99 PM |
163 | .me = THIS_MODULE, |
164 | }, | |
165 | }; | |
166 | ||
167 | static int __init xt_nat_init(void) | |
168 | { | |
169 | return xt_register_targets(xt_nat_target_reg, | |
170 | ARRAY_SIZE(xt_nat_target_reg)); | |
171 | } | |
172 | ||
173 | static void __exit xt_nat_exit(void) | |
174 | { | |
175 | xt_unregister_targets(xt_nat_target_reg, ARRAY_SIZE(xt_nat_target_reg)); | |
176 | } | |
177 | ||
178 | module_init(xt_nat_init); | |
179 | module_exit(xt_nat_exit); | |
180 | ||
181 | MODULE_LICENSE("GPL"); | |
58a317f1 | 182 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
c7232c99 PM |
183 | MODULE_ALIAS("ipt_SNAT"); |
184 | MODULE_ALIAS("ipt_DNAT"); | |
58a317f1 PM |
185 | MODULE_ALIAS("ip6t_SNAT"); |
186 | MODULE_ALIAS("ip6t_DNAT"); |