Commit | Line | Data |
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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 | ||
2f5dc631 FW |
19 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
20 | #include <net/ipv6.h> | |
21 | #include <net/ip6_route.h> | |
22 | #include <net/ip6_fib.h> | |
23 | #endif | |
24 | ||
de81bbea | 25 | #include <linux/netfilter/xt_addrtype.h> |
6709dbbb | 26 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
27 | |
28 | MODULE_LICENSE("GPL"); | |
29 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
de81bbea FW |
30 | MODULE_DESCRIPTION("Xtables: address type match"); |
31 | MODULE_ALIAS("ipt_addrtype"); | |
2f5dc631 FW |
32 | MODULE_ALIAS("ip6t_addrtype"); |
33 | ||
34 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) | |
b7225041 FW |
35 | static u32 match_lookup_rt6(struct net *net, const struct net_device *dev, |
36 | const struct in6_addr *addr) | |
2f5dc631 | 37 | { |
b7225041 FW |
38 | const struct nf_afinfo *afinfo; |
39 | struct flowi6 flow; | |
40 | struct rt6_info *rt; | |
2f5dc631 | 41 | u32 ret; |
b7225041 | 42 | int route_err; |
2f5dc631 | 43 | |
b7225041 FW |
44 | memset(&flow, 0, sizeof(flow)); |
45 | ipv6_addr_copy(&flow.daddr, addr); | |
46 | if (dev) | |
47 | flow.flowi6_oif = dev->ifindex; | |
48 | ||
49 | rcu_read_lock(); | |
50 | ||
51 | afinfo = nf_get_afinfo(NFPROTO_IPV6); | |
52 | if (afinfo != NULL) | |
53 | route_err = afinfo->route(net, (struct dst_entry **)&rt, | |
54 | flowi6_to_flowi(&flow), !!dev); | |
55 | else | |
56 | route_err = 1; | |
57 | ||
58 | rcu_read_unlock(); | |
59 | ||
60 | if (route_err) | |
2f5dc631 FW |
61 | return XT_ADDRTYPE_UNREACHABLE; |
62 | ||
63 | if (rt->rt6i_flags & RTF_REJECT) | |
64 | ret = XT_ADDRTYPE_UNREACHABLE; | |
65 | else | |
66 | ret = 0; | |
67 | ||
68 | if (rt->rt6i_flags & RTF_LOCAL) | |
69 | ret |= XT_ADDRTYPE_LOCAL; | |
70 | if (rt->rt6i_flags & RTF_ANYCAST) | |
71 | ret |= XT_ADDRTYPE_ANYCAST; | |
b7225041 FW |
72 | |
73 | ||
74 | dst_release(&rt->dst); | |
2f5dc631 FW |
75 | return ret; |
76 | } | |
77 | ||
78 | static bool match_type6(struct net *net, const struct net_device *dev, | |
79 | const struct in6_addr *addr, u16 mask) | |
80 | { | |
81 | int addr_type = ipv6_addr_type(addr); | |
82 | ||
83 | if ((mask & XT_ADDRTYPE_MULTICAST) && | |
84 | !(addr_type & IPV6_ADDR_MULTICAST)) | |
85 | return false; | |
86 | if ((mask & XT_ADDRTYPE_UNICAST) && !(addr_type & IPV6_ADDR_UNICAST)) | |
87 | return false; | |
88 | if ((mask & XT_ADDRTYPE_UNSPEC) && addr_type != IPV6_ADDR_ANY) | |
89 | return false; | |
90 | ||
91 | if ((XT_ADDRTYPE_LOCAL | XT_ADDRTYPE_ANYCAST | | |
b7225041 FW |
92 | XT_ADDRTYPE_UNREACHABLE) & mask) |
93 | return !!(mask & match_lookup_rt6(net, dev, addr)); | |
2f5dc631 FW |
94 | return true; |
95 | } | |
96 | ||
97 | static bool | |
98 | addrtype_mt6(struct net *net, const struct net_device *dev, | |
99 | const struct sk_buff *skb, const struct xt_addrtype_info_v1 *info) | |
100 | { | |
101 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
102 | bool ret = true; | |
103 | ||
104 | if (info->source) | |
105 | ret &= match_type6(net, dev, &iph->saddr, info->source) ^ | |
106 | (info->flags & XT_ADDRTYPE_INVERT_SOURCE); | |
107 | if (ret && info->dest) | |
108 | ret &= match_type6(net, dev, &iph->daddr, info->dest) ^ | |
109 | !!(info->flags & XT_ADDRTYPE_INVERT_DEST); | |
110 | return ret; | |
111 | } | |
112 | #endif | |
1da177e4 | 113 | |
d4ec52ba AD |
114 | static inline bool match_type(struct net *net, const struct net_device *dev, |
115 | __be32 addr, u_int16_t mask) | |
1da177e4 | 116 | { |
d4ec52ba | 117 | return !!(mask & (1 << inet_dev_addr_type(net, dev, addr))); |
1da177e4 LT |
118 | } |
119 | ||
d3c5ee6d | 120 | static bool |
62fc8051 | 121 | addrtype_mt_v0(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 122 | { |
d4ec52ba | 123 | struct net *net = dev_net(par->in ? par->in : par->out); |
de81bbea | 124 | const struct xt_addrtype_info *info = par->matchinfo; |
eddc9ec5 | 125 | const struct iphdr *iph = ip_hdr(skb); |
1d93a9cb | 126 | bool ret = true; |
1da177e4 LT |
127 | |
128 | if (info->source) | |
d4ec52ba | 129 | ret &= match_type(net, NULL, iph->saddr, info->source) ^ |
e2cf5ecb | 130 | info->invert_source; |
1da177e4 | 131 | if (info->dest) |
d4ec52ba | 132 | ret &= match_type(net, NULL, iph->daddr, info->dest) ^ |
e2cf5ecb | 133 | info->invert_dest; |
e905a9ed | 134 | |
1da177e4 LT |
135 | return ret; |
136 | } | |
137 | ||
e2cf5ecb | 138 | static bool |
62fc8051 | 139 | addrtype_mt_v1(const struct sk_buff *skb, struct xt_action_param *par) |
e2cf5ecb | 140 | { |
d4ec52ba | 141 | struct net *net = dev_net(par->in ? par->in : par->out); |
de81bbea | 142 | const struct xt_addrtype_info_v1 *info = par->matchinfo; |
2f5dc631 | 143 | const struct iphdr *iph; |
e2cf5ecb LAT |
144 | const struct net_device *dev = NULL; |
145 | bool ret = true; | |
146 | ||
de81bbea | 147 | if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) |
f7108a20 | 148 | dev = par->in; |
de81bbea | 149 | else if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) |
f7108a20 | 150 | dev = par->out; |
e2cf5ecb | 151 | |
2f5dc631 FW |
152 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
153 | if (par->family == NFPROTO_IPV6) | |
154 | return addrtype_mt6(net, dev, skb, info); | |
155 | #endif | |
156 | iph = ip_hdr(skb); | |
e2cf5ecb | 157 | if (info->source) |
d4ec52ba | 158 | ret &= match_type(net, dev, iph->saddr, info->source) ^ |
de81bbea | 159 | (info->flags & XT_ADDRTYPE_INVERT_SOURCE); |
e2cf5ecb | 160 | if (ret && info->dest) |
d4ec52ba | 161 | ret &= match_type(net, dev, iph->daddr, info->dest) ^ |
de81bbea | 162 | !!(info->flags & XT_ADDRTYPE_INVERT_DEST); |
e2cf5ecb LAT |
163 | return ret; |
164 | } | |
165 | ||
b0f38452 | 166 | static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par) |
e2cf5ecb | 167 | { |
de81bbea | 168 | struct xt_addrtype_info_v1 *info = par->matchinfo; |
e2cf5ecb | 169 | |
de81bbea FW |
170 | if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN && |
171 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) { | |
ff67e4e4 JE |
172 | pr_info("both incoming and outgoing " |
173 | "interface limitation cannot be selected\n"); | |
bd414ee6 | 174 | return -EINVAL; |
e2cf5ecb LAT |
175 | } |
176 | ||
9b4fce7a JE |
177 | if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) | |
178 | (1 << NF_INET_LOCAL_IN)) && | |
de81bbea | 179 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) { |
ff67e4e4 JE |
180 | pr_info("output interface limitation " |
181 | "not valid in PREROUTING and INPUT\n"); | |
bd414ee6 | 182 | return -EINVAL; |
e2cf5ecb LAT |
183 | } |
184 | ||
9b4fce7a JE |
185 | if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) | |
186 | (1 << NF_INET_LOCAL_OUT)) && | |
de81bbea | 187 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) { |
ff67e4e4 JE |
188 | pr_info("input interface limitation " |
189 | "not valid in POSTROUTING and OUTPUT\n"); | |
bd414ee6 | 190 | return -EINVAL; |
e2cf5ecb LAT |
191 | } |
192 | ||
2f5dc631 FW |
193 | #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE) |
194 | if (par->family == NFPROTO_IPV6) { | |
195 | if ((info->source | info->dest) & XT_ADDRTYPE_BLACKHOLE) { | |
196 | pr_err("ipv6 BLACKHOLE matching not supported\n"); | |
197 | return -EINVAL; | |
198 | } | |
199 | if ((info->source | info->dest) >= XT_ADDRTYPE_PROHIBIT) { | |
200 | pr_err("ipv6 PROHIBT (THROW, NAT ..) matching not supported\n"); | |
201 | return -EINVAL; | |
202 | } | |
203 | if ((info->source | info->dest) & XT_ADDRTYPE_BROADCAST) { | |
204 | pr_err("ipv6 does not support BROADCAST matching\n"); | |
205 | return -EINVAL; | |
206 | } | |
207 | } | |
208 | #endif | |
bd414ee6 | 209 | return 0; |
e2cf5ecb LAT |
210 | } |
211 | ||
212 | static struct xt_match addrtype_mt_reg[] __read_mostly = { | |
213 | { | |
214 | .name = "addrtype", | |
ee999d8b | 215 | .family = NFPROTO_IPV4, |
e2cf5ecb | 216 | .match = addrtype_mt_v0, |
de81bbea | 217 | .matchsize = sizeof(struct xt_addrtype_info), |
e2cf5ecb LAT |
218 | .me = THIS_MODULE |
219 | }, | |
220 | { | |
221 | .name = "addrtype", | |
2f5dc631 | 222 | .family = NFPROTO_UNSPEC, |
e2cf5ecb LAT |
223 | .revision = 1, |
224 | .match = addrtype_mt_v1, | |
225 | .checkentry = addrtype_mt_checkentry_v1, | |
de81bbea | 226 | .matchsize = sizeof(struct xt_addrtype_info_v1), |
e2cf5ecb LAT |
227 | .me = THIS_MODULE |
228 | } | |
1da177e4 LT |
229 | }; |
230 | ||
d3c5ee6d | 231 | static int __init addrtype_mt_init(void) |
1da177e4 | 232 | { |
e2cf5ecb LAT |
233 | return xt_register_matches(addrtype_mt_reg, |
234 | ARRAY_SIZE(addrtype_mt_reg)); | |
1da177e4 LT |
235 | } |
236 | ||
d3c5ee6d | 237 | static void __exit addrtype_mt_exit(void) |
1da177e4 | 238 | { |
e2cf5ecb | 239 | xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg)); |
1da177e4 LT |
240 | } |
241 | ||
d3c5ee6d JE |
242 | module_init(addrtype_mt_init); |
243 | module_exit(addrtype_mt_exit); |