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1da177e4 LT |
1 | /* |
2 | * iptables module to match inet_addr_type() of an ip. | |
3 | * | |
4 | * Copyright (c) 2004 Patrick McHardy <kaber@trash.net> | |
e2cf5ecb | 5 | * (C) 2007 Laszlo Attila Toth <panther@balabit.hu> |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
ff67e4e4 | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/ip.h> | |
17 | #include <net/route.h> | |
18 | ||
19 | #include <linux/netfilter_ipv4/ipt_addrtype.h> | |
6709dbbb | 20 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
21 | |
22 | MODULE_LICENSE("GPL"); | |
23 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
2ae15b64 | 24 | MODULE_DESCRIPTION("Xtables: address type match for IPv4"); |
1da177e4 | 25 | |
d4ec52ba AD |
26 | static inline bool match_type(struct net *net, const struct net_device *dev, |
27 | __be32 addr, u_int16_t mask) | |
1da177e4 | 28 | { |
d4ec52ba | 29 | return !!(mask & (1 << inet_dev_addr_type(net, dev, addr))); |
1da177e4 LT |
30 | } |
31 | ||
d3c5ee6d | 32 | static bool |
f7108a20 | 33 | addrtype_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 34 | { |
d4ec52ba | 35 | struct net *net = dev_net(par->in ? par->in : par->out); |
f7108a20 | 36 | const struct ipt_addrtype_info *info = par->matchinfo; |
eddc9ec5 | 37 | const struct iphdr *iph = ip_hdr(skb); |
1d93a9cb | 38 | bool ret = true; |
1da177e4 LT |
39 | |
40 | if (info->source) | |
d4ec52ba | 41 | ret &= match_type(net, NULL, iph->saddr, info->source) ^ |
e2cf5ecb | 42 | info->invert_source; |
1da177e4 | 43 | if (info->dest) |
d4ec52ba | 44 | ret &= match_type(net, NULL, iph->daddr, info->dest) ^ |
e2cf5ecb | 45 | info->invert_dest; |
e905a9ed | 46 | |
1da177e4 LT |
47 | return ret; |
48 | } | |
49 | ||
e2cf5ecb | 50 | static bool |
f7108a20 | 51 | addrtype_mt_v1(const struct sk_buff *skb, const struct xt_match_param *par) |
e2cf5ecb | 52 | { |
d4ec52ba | 53 | struct net *net = dev_net(par->in ? par->in : par->out); |
f7108a20 | 54 | const struct ipt_addrtype_info_v1 *info = par->matchinfo; |
e2cf5ecb LAT |
55 | const struct iphdr *iph = ip_hdr(skb); |
56 | const struct net_device *dev = NULL; | |
57 | bool ret = true; | |
58 | ||
59 | if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) | |
f7108a20 | 60 | dev = par->in; |
e2cf5ecb | 61 | else if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) |
f7108a20 | 62 | dev = par->out; |
e2cf5ecb LAT |
63 | |
64 | if (info->source) | |
d4ec52ba | 65 | ret &= match_type(net, dev, iph->saddr, info->source) ^ |
e2cf5ecb LAT |
66 | (info->flags & IPT_ADDRTYPE_INVERT_SOURCE); |
67 | if (ret && info->dest) | |
d4ec52ba | 68 | ret &= match_type(net, dev, iph->daddr, info->dest) ^ |
46faec98 | 69 | !!(info->flags & IPT_ADDRTYPE_INVERT_DEST); |
e2cf5ecb LAT |
70 | return ret; |
71 | } | |
72 | ||
b0f38452 | 73 | static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par) |
e2cf5ecb | 74 | { |
9b4fce7a | 75 | struct ipt_addrtype_info_v1 *info = par->matchinfo; |
e2cf5ecb LAT |
76 | |
77 | if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN && | |
78 | info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) { | |
ff67e4e4 JE |
79 | pr_info("both incoming and outgoing " |
80 | "interface limitation cannot be selected\n"); | |
e2cf5ecb LAT |
81 | return false; |
82 | } | |
83 | ||
9b4fce7a JE |
84 | if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) | |
85 | (1 << NF_INET_LOCAL_IN)) && | |
e2cf5ecb | 86 | info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) { |
ff67e4e4 JE |
87 | pr_info("output interface limitation " |
88 | "not valid in PREROUTING and INPUT\n"); | |
e2cf5ecb LAT |
89 | return false; |
90 | } | |
91 | ||
9b4fce7a JE |
92 | if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) | |
93 | (1 << NF_INET_LOCAL_OUT)) && | |
e2cf5ecb | 94 | info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) { |
ff67e4e4 JE |
95 | pr_info("input interface limitation " |
96 | "not valid in POSTROUTING and OUTPUT\n"); | |
e2cf5ecb LAT |
97 | return false; |
98 | } | |
99 | ||
100 | return true; | |
101 | } | |
102 | ||
103 | static struct xt_match addrtype_mt_reg[] __read_mostly = { | |
104 | { | |
105 | .name = "addrtype", | |
ee999d8b | 106 | .family = NFPROTO_IPV4, |
e2cf5ecb LAT |
107 | .match = addrtype_mt_v0, |
108 | .matchsize = sizeof(struct ipt_addrtype_info), | |
109 | .me = THIS_MODULE | |
110 | }, | |
111 | { | |
112 | .name = "addrtype", | |
ee999d8b | 113 | .family = NFPROTO_IPV4, |
e2cf5ecb LAT |
114 | .revision = 1, |
115 | .match = addrtype_mt_v1, | |
116 | .checkentry = addrtype_mt_checkentry_v1, | |
117 | .matchsize = sizeof(struct ipt_addrtype_info_v1), | |
118 | .me = THIS_MODULE | |
119 | } | |
1da177e4 LT |
120 | }; |
121 | ||
d3c5ee6d | 122 | static int __init addrtype_mt_init(void) |
1da177e4 | 123 | { |
e2cf5ecb LAT |
124 | return xt_register_matches(addrtype_mt_reg, |
125 | ARRAY_SIZE(addrtype_mt_reg)); | |
1da177e4 LT |
126 | } |
127 | ||
d3c5ee6d | 128 | static void __exit addrtype_mt_exit(void) |
1da177e4 | 129 | { |
e2cf5ecb | 130 | xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg)); |
1da177e4 LT |
131 | } |
132 | ||
d3c5ee6d JE |
133 | module_init(addrtype_mt_init); |
134 | module_exit(addrtype_mt_exit); |