Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 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 0; |
| 27 | } |
| 28 | |
| 29 | static void xt_nat_convert_range(struct nf_nat_range *dst, |
| 30 | const struct nf_nat_ipv4_range *src) |
| 31 | { |
| 32 | memset(&dst->min_addr, 0, sizeof(dst->min_addr)); |
| 33 | memset(&dst->max_addr, 0, sizeof(dst->max_addr)); |
| 34 | |
| 35 | dst->flags = src->flags; |
| 36 | dst->min_addr.ip = src->min_ip; |
| 37 | dst->max_addr.ip = src->max_ip; |
| 38 | dst->min_proto = src->min; |
| 39 | dst->max_proto = src->max; |
| 40 | } |
| 41 | |
| 42 | static unsigned int |
| 43 | xt_snat_target_v0(struct sk_buff *skb, const struct xt_action_param *par) |
| 44 | { |
| 45 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; |
| 46 | struct nf_nat_range range; |
| 47 | enum ip_conntrack_info ctinfo; |
| 48 | struct nf_conn *ct; |
| 49 | |
| 50 | ct = nf_ct_get(skb, &ctinfo); |
| 51 | NF_CT_ASSERT(ct != NULL && |
| 52 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED || |
| 53 | ctinfo == IP_CT_RELATED_REPLY)); |
| 54 | |
| 55 | xt_nat_convert_range(&range, &mr->range[0]); |
| 56 | return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC); |
| 57 | } |
| 58 | |
| 59 | static unsigned int |
| 60 | xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par) |
| 61 | { |
| 62 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; |
| 63 | struct nf_nat_range range; |
| 64 | enum ip_conntrack_info ctinfo; |
| 65 | struct nf_conn *ct; |
| 66 | |
| 67 | ct = nf_ct_get(skb, &ctinfo); |
| 68 | NF_CT_ASSERT(ct != NULL && |
| 69 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); |
| 70 | |
| 71 | xt_nat_convert_range(&range, &mr->range[0]); |
| 72 | return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST); |
| 73 | } |
| 74 | |
| 75 | static unsigned int |
| 76 | xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par) |
| 77 | { |
| 78 | const struct nf_nat_range *range = par->targinfo; |
| 79 | enum ip_conntrack_info ctinfo; |
| 80 | struct nf_conn *ct; |
| 81 | |
| 82 | ct = nf_ct_get(skb, &ctinfo); |
| 83 | NF_CT_ASSERT(ct != NULL && |
| 84 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED || |
| 85 | ctinfo == IP_CT_RELATED_REPLY)); |
| 86 | |
| 87 | return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC); |
| 88 | } |
| 89 | |
| 90 | static unsigned int |
| 91 | xt_dnat_target_v1(struct sk_buff *skb, const struct xt_action_param *par) |
| 92 | { |
| 93 | const struct nf_nat_range *range = par->targinfo; |
| 94 | enum ip_conntrack_info ctinfo; |
| 95 | struct nf_conn *ct; |
| 96 | |
| 97 | ct = nf_ct_get(skb, &ctinfo); |
| 98 | NF_CT_ASSERT(ct != NULL && |
| 99 | (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); |
| 100 | |
| 101 | return nf_nat_setup_info(ct, range, NF_NAT_MANIP_DST); |
| 102 | } |
| 103 | |
| 104 | static struct xt_target xt_nat_target_reg[] __read_mostly = { |
| 105 | { |
| 106 | .name = "SNAT", |
| 107 | .revision = 0, |
| 108 | .checkentry = xt_nat_checkentry_v0, |
| 109 | .target = xt_snat_target_v0, |
| 110 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), |
| 111 | .family = NFPROTO_IPV4, |
| 112 | .table = "nat", |
| 113 | .hooks = (1 << NF_INET_POST_ROUTING) | |
Elison Niven | 939ccba | 2012-10-15 00:44:48 +0000 | [diff] [blame] | 114 | (1 << NF_INET_LOCAL_IN), |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 115 | .me = THIS_MODULE, |
| 116 | }, |
| 117 | { |
| 118 | .name = "DNAT", |
| 119 | .revision = 0, |
| 120 | .checkentry = xt_nat_checkentry_v0, |
| 121 | .target = xt_dnat_target_v0, |
| 122 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), |
| 123 | .family = NFPROTO_IPV4, |
| 124 | .table = "nat", |
| 125 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
Elison Niven | 939ccba | 2012-10-15 00:44:48 +0000 | [diff] [blame] | 126 | (1 << NF_INET_LOCAL_OUT), |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 127 | .me = THIS_MODULE, |
| 128 | }, |
| 129 | { |
| 130 | .name = "SNAT", |
| 131 | .revision = 1, |
| 132 | .target = xt_snat_target_v1, |
| 133 | .targetsize = sizeof(struct nf_nat_range), |
| 134 | .table = "nat", |
| 135 | .hooks = (1 << NF_INET_POST_ROUTING) | |
Elison Niven | 939ccba | 2012-10-15 00:44:48 +0000 | [diff] [blame] | 136 | (1 << NF_INET_LOCAL_IN), |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 137 | .me = THIS_MODULE, |
| 138 | }, |
| 139 | { |
| 140 | .name = "DNAT", |
| 141 | .revision = 1, |
| 142 | .target = xt_dnat_target_v1, |
| 143 | .targetsize = sizeof(struct nf_nat_range), |
| 144 | .table = "nat", |
| 145 | .hooks = (1 << NF_INET_PRE_ROUTING) | |
Elison Niven | 939ccba | 2012-10-15 00:44:48 +0000 | [diff] [blame] | 146 | (1 << NF_INET_LOCAL_OUT), |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 147 | .me = THIS_MODULE, |
| 148 | }, |
| 149 | }; |
| 150 | |
| 151 | static int __init xt_nat_init(void) |
| 152 | { |
| 153 | return xt_register_targets(xt_nat_target_reg, |
| 154 | ARRAY_SIZE(xt_nat_target_reg)); |
| 155 | } |
| 156 | |
| 157 | static void __exit xt_nat_exit(void) |
| 158 | { |
| 159 | xt_unregister_targets(xt_nat_target_reg, ARRAY_SIZE(xt_nat_target_reg)); |
| 160 | } |
| 161 | |
| 162 | module_init(xt_nat_init); |
| 163 | module_exit(xt_nat_exit); |
| 164 | |
| 165 | MODULE_LICENSE("GPL"); |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 166 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 167 | MODULE_ALIAS("ipt_SNAT"); |
| 168 | MODULE_ALIAS("ipt_DNAT"); |
Patrick McHardy | 58a317f | 2012-08-26 19:14:12 +0200 | [diff] [blame] | 169 | MODULE_ALIAS("ip6t_SNAT"); |
| 170 | MODULE_ALIAS("ip6t_DNAT"); |