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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 | ||
c0cd1156 | 19 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
2f5dc631 FW |
20 | #include <net/ipv6.h> |
21 | #include <net/ip6_route.h> | |
22 | #include <net/ip6_fib.h> | |
23 | #endif | |
24 | ||
2a7851bf | 25 | #include <linux/netfilter_ipv6.h> |
de81bbea | 26 | #include <linux/netfilter/xt_addrtype.h> |
6709dbbb | 27 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
28 | |
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
de81bbea FW |
31 | MODULE_DESCRIPTION("Xtables: address type match"); |
32 | MODULE_ALIAS("ipt_addrtype"); | |
2f5dc631 FW |
33 | MODULE_ALIAS("ip6t_addrtype"); |
34 | ||
c0cd1156 | 35 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
b7225041 | 36 | static u32 match_lookup_rt6(struct net *net, const struct net_device *dev, |
2a7851bf | 37 | const struct in6_addr *addr, u16 mask) |
2f5dc631 | 38 | { |
b7225041 FW |
39 | struct flowi6 flow; |
40 | struct rt6_info *rt; | |
2a7851bf | 41 | u32 ret = 0; |
b7225041 | 42 | int route_err; |
2f5dc631 | 43 | |
b7225041 | 44 | memset(&flow, 0, sizeof(flow)); |
4e3fd7a0 | 45 | flow.daddr = *addr; |
b7225041 FW |
46 | if (dev) |
47 | flow.flowi6_oif = dev->ifindex; | |
48 | ||
ac02bcf9 FW |
49 | if (dev && (mask & XT_ADDRTYPE_LOCAL)) { |
50 | if (nf_ipv6_chk_addr(net, addr, dev, true)) | |
51 | ret = XT_ADDRTYPE_LOCAL; | |
2a7851bf | 52 | } |
b7225041 | 53 | |
ac02bcf9 FW |
54 | route_err = nf_ip6_route(net, (struct dst_entry **)&rt, |
55 | flowi6_to_flowi(&flow), false); | |
b7225041 | 56 | if (route_err) |
2f5dc631 FW |
57 | return XT_ADDRTYPE_UNREACHABLE; |
58 | ||
59 | if (rt->rt6i_flags & RTF_REJECT) | |
60 | ret = XT_ADDRTYPE_UNREACHABLE; | |
2f5dc631 | 61 | |
2a7851bf | 62 | if (dev == NULL && rt->rt6i_flags & RTF_LOCAL) |
2f5dc631 | 63 | ret |= XT_ADDRTYPE_LOCAL; |
2647a9b0 | 64 | if (ipv6_anycast_destination((struct dst_entry *)rt, addr)) |
2f5dc631 | 65 | ret |= XT_ADDRTYPE_ANYCAST; |
b7225041 | 66 | |
b7225041 | 67 | dst_release(&rt->dst); |
2f5dc631 FW |
68 | return ret; |
69 | } | |
70 | ||
71 | static bool match_type6(struct net *net, const struct net_device *dev, | |
72 | const struct in6_addr *addr, u16 mask) | |
73 | { | |
74 | int addr_type = ipv6_addr_type(addr); | |
75 | ||
76 | if ((mask & XT_ADDRTYPE_MULTICAST) && | |
77 | !(addr_type & IPV6_ADDR_MULTICAST)) | |
78 | return false; | |
79 | if ((mask & XT_ADDRTYPE_UNICAST) && !(addr_type & IPV6_ADDR_UNICAST)) | |
80 | return false; | |
81 | if ((mask & XT_ADDRTYPE_UNSPEC) && addr_type != IPV6_ADDR_ANY) | |
82 | return false; | |
83 | ||
84 | if ((XT_ADDRTYPE_LOCAL | XT_ADDRTYPE_ANYCAST | | |
b7225041 | 85 | XT_ADDRTYPE_UNREACHABLE) & mask) |
2a7851bf | 86 | return !!(mask & match_lookup_rt6(net, dev, addr, mask)); |
2f5dc631 FW |
87 | return true; |
88 | } | |
89 | ||
90 | static bool | |
91 | addrtype_mt6(struct net *net, const struct net_device *dev, | |
92 | const struct sk_buff *skb, const struct xt_addrtype_info_v1 *info) | |
93 | { | |
94 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
95 | bool ret = true; | |
96 | ||
97 | if (info->source) | |
98 | ret &= match_type6(net, dev, &iph->saddr, info->source) ^ | |
99 | (info->flags & XT_ADDRTYPE_INVERT_SOURCE); | |
100 | if (ret && info->dest) | |
101 | ret &= match_type6(net, dev, &iph->daddr, info->dest) ^ | |
102 | !!(info->flags & XT_ADDRTYPE_INVERT_DEST); | |
103 | return ret; | |
104 | } | |
105 | #endif | |
1da177e4 | 106 | |
d4ec52ba AD |
107 | static inline bool match_type(struct net *net, const struct net_device *dev, |
108 | __be32 addr, u_int16_t mask) | |
1da177e4 | 109 | { |
d4ec52ba | 110 | return !!(mask & (1 << inet_dev_addr_type(net, dev, addr))); |
1da177e4 LT |
111 | } |
112 | ||
d3c5ee6d | 113 | static bool |
62fc8051 | 114 | addrtype_mt_v0(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 115 | { |
613dbd95 | 116 | struct net *net = xt_net(par); |
de81bbea | 117 | const struct xt_addrtype_info *info = par->matchinfo; |
eddc9ec5 | 118 | const struct iphdr *iph = ip_hdr(skb); |
1d93a9cb | 119 | bool ret = true; |
1da177e4 LT |
120 | |
121 | if (info->source) | |
d4ec52ba | 122 | ret &= match_type(net, NULL, iph->saddr, info->source) ^ |
e2cf5ecb | 123 | info->invert_source; |
1da177e4 | 124 | if (info->dest) |
d4ec52ba | 125 | ret &= match_type(net, NULL, iph->daddr, info->dest) ^ |
e2cf5ecb | 126 | info->invert_dest; |
e905a9ed | 127 | |
1da177e4 LT |
128 | return ret; |
129 | } | |
130 | ||
e2cf5ecb | 131 | static bool |
62fc8051 | 132 | addrtype_mt_v1(const struct sk_buff *skb, struct xt_action_param *par) |
e2cf5ecb | 133 | { |
613dbd95 | 134 | struct net *net = xt_net(par); |
de81bbea | 135 | const struct xt_addrtype_info_v1 *info = par->matchinfo; |
2f5dc631 | 136 | const struct iphdr *iph; |
e2cf5ecb LAT |
137 | const struct net_device *dev = NULL; |
138 | bool ret = true; | |
139 | ||
de81bbea | 140 | if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) |
613dbd95 | 141 | dev = xt_in(par); |
de81bbea | 142 | else if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) |
613dbd95 | 143 | dev = xt_out(par); |
e2cf5ecb | 144 | |
c0cd1156 | 145 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
613dbd95 | 146 | if (xt_family(par) == NFPROTO_IPV6) |
2f5dc631 FW |
147 | return addrtype_mt6(net, dev, skb, info); |
148 | #endif | |
149 | iph = ip_hdr(skb); | |
e2cf5ecb | 150 | if (info->source) |
d4ec52ba | 151 | ret &= match_type(net, dev, iph->saddr, info->source) ^ |
de81bbea | 152 | (info->flags & XT_ADDRTYPE_INVERT_SOURCE); |
e2cf5ecb | 153 | if (ret && info->dest) |
d4ec52ba | 154 | ret &= match_type(net, dev, iph->daddr, info->dest) ^ |
de81bbea | 155 | !!(info->flags & XT_ADDRTYPE_INVERT_DEST); |
e2cf5ecb LAT |
156 | return ret; |
157 | } | |
158 | ||
b0f38452 | 159 | static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par) |
e2cf5ecb | 160 | { |
c08e5e1e | 161 | const char *errmsg = "both incoming and outgoing interface limitation cannot be selected"; |
de81bbea | 162 | struct xt_addrtype_info_v1 *info = par->matchinfo; |
e2cf5ecb | 163 | |
de81bbea | 164 | if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN && |
c08e5e1e FW |
165 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) |
166 | goto err; | |
e2cf5ecb | 167 | |
9b4fce7a JE |
168 | if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) | |
169 | (1 << NF_INET_LOCAL_IN)) && | |
de81bbea | 170 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) { |
c08e5e1e FW |
171 | errmsg = "output interface limitation not valid in PREROUTING and INPUT"; |
172 | goto err; | |
e2cf5ecb LAT |
173 | } |
174 | ||
9b4fce7a JE |
175 | if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) | |
176 | (1 << NF_INET_LOCAL_OUT)) && | |
de81bbea | 177 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) { |
c08e5e1e FW |
178 | errmsg = "input interface limitation not valid in POSTROUTING and OUTPUT"; |
179 | goto err; | |
e2cf5ecb LAT |
180 | } |
181 | ||
c0cd1156 | 182 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
2f5dc631 FW |
183 | if (par->family == NFPROTO_IPV6) { |
184 | if ((info->source | info->dest) & XT_ADDRTYPE_BLACKHOLE) { | |
c08e5e1e FW |
185 | errmsg = "ipv6 BLACKHOLE matching not supported"; |
186 | goto err; | |
2f5dc631 FW |
187 | } |
188 | if ((info->source | info->dest) >= XT_ADDRTYPE_PROHIBIT) { | |
c08e5e1e FW |
189 | errmsg = "ipv6 PROHIBIT (THROW, NAT ..) matching not supported"; |
190 | goto err; | |
2f5dc631 FW |
191 | } |
192 | if ((info->source | info->dest) & XT_ADDRTYPE_BROADCAST) { | |
c08e5e1e FW |
193 | errmsg = "ipv6 does not support BROADCAST matching"; |
194 | goto err; | |
2f5dc631 FW |
195 | } |
196 | } | |
197 | #endif | |
bd414ee6 | 198 | return 0; |
c08e5e1e FW |
199 | err: |
200 | pr_info_ratelimited("%s\n", errmsg); | |
201 | return -EINVAL; | |
e2cf5ecb LAT |
202 | } |
203 | ||
204 | static struct xt_match addrtype_mt_reg[] __read_mostly = { | |
205 | { | |
206 | .name = "addrtype", | |
ee999d8b | 207 | .family = NFPROTO_IPV4, |
e2cf5ecb | 208 | .match = addrtype_mt_v0, |
de81bbea | 209 | .matchsize = sizeof(struct xt_addrtype_info), |
e2cf5ecb LAT |
210 | .me = THIS_MODULE |
211 | }, | |
212 | { | |
213 | .name = "addrtype", | |
2f5dc631 | 214 | .family = NFPROTO_UNSPEC, |
e2cf5ecb LAT |
215 | .revision = 1, |
216 | .match = addrtype_mt_v1, | |
217 | .checkentry = addrtype_mt_checkentry_v1, | |
de81bbea | 218 | .matchsize = sizeof(struct xt_addrtype_info_v1), |
e2cf5ecb LAT |
219 | .me = THIS_MODULE |
220 | } | |
1da177e4 LT |
221 | }; |
222 | ||
d3c5ee6d | 223 | static int __init addrtype_mt_init(void) |
1da177e4 | 224 | { |
e2cf5ecb LAT |
225 | return xt_register_matches(addrtype_mt_reg, |
226 | ARRAY_SIZE(addrtype_mt_reg)); | |
1da177e4 LT |
227 | } |
228 | ||
d3c5ee6d | 229 | static void __exit addrtype_mt_exit(void) |
1da177e4 | 230 | { |
e2cf5ecb | 231 | xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg)); |
1da177e4 LT |
232 | } |
233 | ||
d3c5ee6d JE |
234 | module_init(addrtype_mt_init); |
235 | module_exit(addrtype_mt_exit); |