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Linux/net/netfilter/xt_nat.c

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  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         }
 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);
 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         WARN_ON(!(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         WARN_ON(!(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         WARN_ON(!(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         WARN_ON(!(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,
119                 .destroy        = xt_nat_destroy,
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) |
125                                   (1 << NF_INET_LOCAL_IN),
126                 .me             = THIS_MODULE,
127         },
128         {
129                 .name           = "DNAT",
130                 .revision       = 0,
131                 .checkentry     = xt_nat_checkentry_v0,
132                 .destroy        = xt_nat_destroy,
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) |
138                                   (1 << NF_INET_LOCAL_OUT),
139                 .me             = THIS_MODULE,
140         },
141         {
142                 .name           = "SNAT",
143                 .revision       = 1,
144                 .checkentry     = xt_nat_checkentry,
145                 .destroy        = xt_nat_destroy,
146                 .target         = xt_snat_target_v1,
147                 .targetsize     = sizeof(struct nf_nat_range),
148                 .table          = "nat",
149                 .hooks          = (1 << NF_INET_POST_ROUTING) |
150                                   (1 << NF_INET_LOCAL_IN),
151                 .me             = THIS_MODULE,
152         },
153         {
154                 .name           = "DNAT",
155                 .revision       = 1,
156                 .checkentry     = xt_nat_checkentry,
157                 .destroy        = xt_nat_destroy,
158                 .target         = xt_dnat_target_v1,
159                 .targetsize     = sizeof(struct nf_nat_range),
160                 .table          = "nat",
161                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
162                                   (1 << NF_INET_LOCAL_OUT),
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");
182 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
183 MODULE_ALIAS("ipt_SNAT");
184 MODULE_ALIAS("ipt_DNAT");
185 MODULE_ALIAS("ip6t_SNAT");
186 MODULE_ALIAS("ip6t_DNAT");
187 

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