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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Masquerade. Simple mapping which alters range to a local IP address |
3 | (depending on route). */ | |
4 | ||
5 | /* (C) 1999-2001 Paul `Rusty' Russell | |
5b1158e9 | 6 | * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
1da177e4 | 7 | */ |
ff67e4e4 | 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 | 9 | #include <linux/module.h> |
6709dbbb | 10 | #include <linux/netfilter/x_tables.h> |
c7232c99 | 11 | #include <net/netfilter/nf_nat.h> |
bf8981a2 | 12 | #include <net/netfilter/nf_nat_masquerade.h> |
1da177e4 LT |
13 | |
14 | MODULE_LICENSE("GPL"); | |
15 | MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); | |
2ae15b64 | 16 | MODULE_DESCRIPTION("Xtables: automatic-address SNAT"); |
1da177e4 | 17 | |
1da177e4 | 18 | /* FIXME: Multiple targets. --RR */ |
135367b8 | 19 | static int masquerade_tg_check(const struct xt_tgchk_param *par) |
1da177e4 | 20 | { |
cbc9f2f4 | 21 | const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; |
1da177e4 | 22 | |
cbc9f2f4 | 23 | if (mr->range[0].flags & NF_NAT_RANGE_MAP_IPS) { |
ff67e4e4 | 24 | pr_debug("bad MAP_IPS.\n"); |
d6b00a53 | 25 | return -EINVAL; |
1da177e4 LT |
26 | } |
27 | if (mr->rangesize != 1) { | |
ff67e4e4 | 28 | pr_debug("bad rangesize %u\n", mr->rangesize); |
d6b00a53 | 29 | return -EINVAL; |
1da177e4 | 30 | } |
a357b3f8 | 31 | return nf_ct_netns_get(par->net, par->family); |
1da177e4 LT |
32 | } |
33 | ||
34 | static unsigned int | |
4b560b44 | 35 | masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 36 | { |
2eb0f624 | 37 | struct nf_nat_range2 range; |
cbc9f2f4 | 38 | const struct nf_nat_ipv4_multi_range_compat *mr; |
adcb5ad1 | 39 | |
7eb35586 | 40 | mr = par->targinfo; |
8dd33cc9 AB |
41 | range.flags = mr->range[0].flags; |
42 | range.min_proto = mr->range[0].min; | |
43 | range.max_proto = mr->range[0].max; | |
1da177e4 | 44 | |
613dbd95 PNA |
45 | return nf_nat_masquerade_ipv4(skb, xt_hooknum(par), &range, |
46 | xt_out(par)); | |
1da177e4 LT |
47 | } |
48 | ||
a357b3f8 FW |
49 | static void masquerade_tg_destroy(const struct xt_tgdtor_param *par) |
50 | { | |
51 | nf_ct_netns_put(par->net, par->family); | |
52 | } | |
53 | ||
adf82acc FW |
54 | #if IS_ENABLED(CONFIG_IPV6) |
55 | static unsigned int | |
56 | masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par) | |
57 | { | |
58 | return nf_nat_masquerade_ipv6(skb, par->targinfo, xt_out(par)); | |
59 | } | |
60 | ||
61 | static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par) | |
62 | { | |
63 | const struct nf_nat_range2 *range = par->targinfo; | |
64 | ||
65 | if (range->flags & NF_NAT_RANGE_MAP_IPS) | |
66 | return -EINVAL; | |
67 | ||
68 | return nf_ct_netns_get(par->net, par->family); | |
69 | } | |
70 | #endif | |
71 | ||
72 | static struct xt_target masquerade_tg_reg[] __read_mostly = { | |
73 | { | |
74 | #if IS_ENABLED(CONFIG_IPV6) | |
75 | .name = "MASQUERADE", | |
76 | .family = NFPROTO_IPV6, | |
77 | .target = masquerade_tg6, | |
78 | .targetsize = sizeof(struct nf_nat_range), | |
79 | .table = "nat", | |
80 | .hooks = 1 << NF_INET_POST_ROUTING, | |
81 | .checkentry = masquerade_tg6_checkentry, | |
82 | .destroy = masquerade_tg_destroy, | |
83 | .me = THIS_MODULE, | |
84 | }, { | |
85 | #endif | |
86 | .name = "MASQUERADE", | |
87 | .family = NFPROTO_IPV4, | |
88 | .target = masquerade_tg, | |
89 | .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), | |
90 | .table = "nat", | |
91 | .hooks = 1 << NF_INET_POST_ROUTING, | |
92 | .checkentry = masquerade_tg_check, | |
93 | .destroy = masquerade_tg_destroy, | |
94 | .me = THIS_MODULE, | |
95 | } | |
1da177e4 LT |
96 | }; |
97 | ||
d3c5ee6d | 98 | static int __init masquerade_tg_init(void) |
1da177e4 LT |
99 | { |
100 | int ret; | |
101 | ||
adf82acc FW |
102 | ret = xt_register_targets(masquerade_tg_reg, |
103 | ARRAY_SIZE(masquerade_tg_reg)); | |
584eab29 TY |
104 | if (ret) |
105 | return ret; | |
1da177e4 | 106 | |
610a4314 | 107 | ret = nf_nat_masquerade_inet_register_notifiers(); |
adf82acc FW |
108 | if (ret) { |
109 | xt_unregister_targets(masquerade_tg_reg, | |
110 | ARRAY_SIZE(masquerade_tg_reg)); | |
111 | return ret; | |
112 | } | |
1da177e4 LT |
113 | |
114 | return ret; | |
115 | } | |
116 | ||
d3c5ee6d | 117 | static void __exit masquerade_tg_exit(void) |
1da177e4 | 118 | { |
adf82acc | 119 | xt_unregister_targets(masquerade_tg_reg, ARRAY_SIZE(masquerade_tg_reg)); |
610a4314 | 120 | nf_nat_masquerade_inet_unregister_notifiers(); |
1da177e4 LT |
121 | } |
122 | ||
d3c5ee6d JE |
123 | module_init(masquerade_tg_init); |
124 | module_exit(masquerade_tg_exit); | |
adf82acc FW |
125 | #if IS_ENABLED(CONFIG_IPV6) |
126 | MODULE_ALIAS("ip6t_MASQUERADE"); | |
127 | #endif | |
128 | MODULE_ALIAS("ipt_MASQUERADE"); |