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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 | { |
3f87c08c | 39 | const struct nf_ipv6_ops *v6ops; |
b7225041 FW |
40 | struct flowi6 flow; |
41 | struct rt6_info *rt; | |
2a7851bf | 42 | u32 ret = 0; |
b7225041 | 43 | int route_err; |
2f5dc631 | 44 | |
b7225041 | 45 | memset(&flow, 0, sizeof(flow)); |
4e3fd7a0 | 46 | flow.daddr = *addr; |
b7225041 FW |
47 | if (dev) |
48 | flow.flowi6_oif = dev->ifindex; | |
49 | ||
3f87c08c PNA |
50 | v6ops = nf_get_ipv6_ops(); |
51 | if (v6ops) { | |
2a7851bf | 52 | if (dev && (mask & XT_ADDRTYPE_LOCAL)) { |
3f87c08c | 53 | if (v6ops->chk_addr(net, addr, dev, true)) |
2a7851bf FW |
54 | ret = XT_ADDRTYPE_LOCAL; |
55 | } | |
3f87c08c PNA |
56 | route_err = v6ops->route(net, (struct dst_entry **)&rt, |
57 | flowi6_to_flowi(&flow), false); | |
2a7851bf | 58 | } else { |
b7225041 | 59 | route_err = 1; |
2a7851bf | 60 | } |
b7225041 FW |
61 | |
62 | if (route_err) | |
2f5dc631 FW |
63 | return XT_ADDRTYPE_UNREACHABLE; |
64 | ||
65 | if (rt->rt6i_flags & RTF_REJECT) | |
66 | ret = XT_ADDRTYPE_UNREACHABLE; | |
2f5dc631 | 67 | |
2a7851bf | 68 | if (dev == NULL && rt->rt6i_flags & RTF_LOCAL) |
2f5dc631 | 69 | ret |= XT_ADDRTYPE_LOCAL; |
2647a9b0 | 70 | if (ipv6_anycast_destination((struct dst_entry *)rt, addr)) |
2f5dc631 | 71 | ret |= XT_ADDRTYPE_ANYCAST; |
b7225041 | 72 | |
b7225041 | 73 | dst_release(&rt->dst); |
2f5dc631 FW |
74 | return ret; |
75 | } | |
76 | ||
77 | static bool match_type6(struct net *net, const struct net_device *dev, | |
78 | const struct in6_addr *addr, u16 mask) | |
79 | { | |
80 | int addr_type = ipv6_addr_type(addr); | |
81 | ||
82 | if ((mask & XT_ADDRTYPE_MULTICAST) && | |
83 | !(addr_type & IPV6_ADDR_MULTICAST)) | |
84 | return false; | |
85 | if ((mask & XT_ADDRTYPE_UNICAST) && !(addr_type & IPV6_ADDR_UNICAST)) | |
86 | return false; | |
87 | if ((mask & XT_ADDRTYPE_UNSPEC) && addr_type != IPV6_ADDR_ANY) | |
88 | return false; | |
89 | ||
90 | if ((XT_ADDRTYPE_LOCAL | XT_ADDRTYPE_ANYCAST | | |
b7225041 | 91 | XT_ADDRTYPE_UNREACHABLE) & mask) |
2a7851bf | 92 | return !!(mask & match_lookup_rt6(net, dev, addr, mask)); |
2f5dc631 FW |
93 | return true; |
94 | } | |
95 | ||
96 | static bool | |
97 | addrtype_mt6(struct net *net, const struct net_device *dev, | |
98 | const struct sk_buff *skb, const struct xt_addrtype_info_v1 *info) | |
99 | { | |
100 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
101 | bool ret = true; | |
102 | ||
103 | if (info->source) | |
104 | ret &= match_type6(net, dev, &iph->saddr, info->source) ^ | |
105 | (info->flags & XT_ADDRTYPE_INVERT_SOURCE); | |
106 | if (ret && info->dest) | |
107 | ret &= match_type6(net, dev, &iph->daddr, info->dest) ^ | |
108 | !!(info->flags & XT_ADDRTYPE_INVERT_DEST); | |
109 | return ret; | |
110 | } | |
111 | #endif | |
1da177e4 | 112 | |
d4ec52ba AD |
113 | static inline bool match_type(struct net *net, const struct net_device *dev, |
114 | __be32 addr, u_int16_t mask) | |
1da177e4 | 115 | { |
d4ec52ba | 116 | return !!(mask & (1 << inet_dev_addr_type(net, dev, addr))); |
1da177e4 LT |
117 | } |
118 | ||
d3c5ee6d | 119 | static bool |
62fc8051 | 120 | addrtype_mt_v0(const struct sk_buff *skb, struct xt_action_param *par) |
1da177e4 | 121 | { |
613dbd95 | 122 | struct net *net = xt_net(par); |
de81bbea | 123 | const struct xt_addrtype_info *info = par->matchinfo; |
eddc9ec5 | 124 | const struct iphdr *iph = ip_hdr(skb); |
1d93a9cb | 125 | bool ret = true; |
1da177e4 LT |
126 | |
127 | if (info->source) | |
d4ec52ba | 128 | ret &= match_type(net, NULL, iph->saddr, info->source) ^ |
e2cf5ecb | 129 | info->invert_source; |
1da177e4 | 130 | if (info->dest) |
d4ec52ba | 131 | ret &= match_type(net, NULL, iph->daddr, info->dest) ^ |
e2cf5ecb | 132 | info->invert_dest; |
e905a9ed | 133 | |
1da177e4 LT |
134 | return ret; |
135 | } | |
136 | ||
e2cf5ecb | 137 | static bool |
62fc8051 | 138 | addrtype_mt_v1(const struct sk_buff *skb, struct xt_action_param *par) |
e2cf5ecb | 139 | { |
613dbd95 | 140 | struct net *net = xt_net(par); |
de81bbea | 141 | const struct xt_addrtype_info_v1 *info = par->matchinfo; |
2f5dc631 | 142 | const struct iphdr *iph; |
e2cf5ecb LAT |
143 | const struct net_device *dev = NULL; |
144 | bool ret = true; | |
145 | ||
de81bbea | 146 | if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) |
613dbd95 | 147 | dev = xt_in(par); |
de81bbea | 148 | else if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) |
613dbd95 | 149 | dev = xt_out(par); |
e2cf5ecb | 150 | |
c0cd1156 | 151 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
613dbd95 | 152 | if (xt_family(par) == NFPROTO_IPV6) |
2f5dc631 FW |
153 | return addrtype_mt6(net, dev, skb, info); |
154 | #endif | |
155 | iph = ip_hdr(skb); | |
e2cf5ecb | 156 | if (info->source) |
d4ec52ba | 157 | ret &= match_type(net, dev, iph->saddr, info->source) ^ |
de81bbea | 158 | (info->flags & XT_ADDRTYPE_INVERT_SOURCE); |
e2cf5ecb | 159 | if (ret && info->dest) |
d4ec52ba | 160 | ret &= match_type(net, dev, iph->daddr, info->dest) ^ |
de81bbea | 161 | !!(info->flags & XT_ADDRTYPE_INVERT_DEST); |
e2cf5ecb LAT |
162 | return ret; |
163 | } | |
164 | ||
b0f38452 | 165 | static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par) |
e2cf5ecb | 166 | { |
c08e5e1e | 167 | const char *errmsg = "both incoming and outgoing interface limitation cannot be selected"; |
de81bbea | 168 | struct xt_addrtype_info_v1 *info = par->matchinfo; |
e2cf5ecb | 169 | |
de81bbea | 170 | if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN && |
c08e5e1e FW |
171 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) |
172 | goto err; | |
e2cf5ecb | 173 | |
9b4fce7a JE |
174 | if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) | |
175 | (1 << NF_INET_LOCAL_IN)) && | |
de81bbea | 176 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) { |
c08e5e1e FW |
177 | errmsg = "output interface limitation not valid in PREROUTING and INPUT"; |
178 | goto err; | |
e2cf5ecb LAT |
179 | } |
180 | ||
9b4fce7a JE |
181 | if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) | |
182 | (1 << NF_INET_LOCAL_OUT)) && | |
de81bbea | 183 | info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) { |
c08e5e1e FW |
184 | errmsg = "input interface limitation not valid in POSTROUTING and OUTPUT"; |
185 | goto err; | |
e2cf5ecb LAT |
186 | } |
187 | ||
c0cd1156 | 188 | #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) |
2f5dc631 FW |
189 | if (par->family == NFPROTO_IPV6) { |
190 | if ((info->source | info->dest) & XT_ADDRTYPE_BLACKHOLE) { | |
c08e5e1e FW |
191 | errmsg = "ipv6 BLACKHOLE matching not supported"; |
192 | goto err; | |
2f5dc631 FW |
193 | } |
194 | if ((info->source | info->dest) >= XT_ADDRTYPE_PROHIBIT) { | |
c08e5e1e FW |
195 | errmsg = "ipv6 PROHIBIT (THROW, NAT ..) matching not supported"; |
196 | goto err; | |
2f5dc631 FW |
197 | } |
198 | if ((info->source | info->dest) & XT_ADDRTYPE_BROADCAST) { | |
c08e5e1e FW |
199 | errmsg = "ipv6 does not support BROADCAST matching"; |
200 | goto err; | |
2f5dc631 FW |
201 | } |
202 | } | |
203 | #endif | |
bd414ee6 | 204 | return 0; |
c08e5e1e FW |
205 | err: |
206 | pr_info_ratelimited("%s\n", errmsg); | |
207 | return -EINVAL; | |
e2cf5ecb LAT |
208 | } |
209 | ||
210 | static struct xt_match addrtype_mt_reg[] __read_mostly = { | |
211 | { | |
212 | .name = "addrtype", | |
ee999d8b | 213 | .family = NFPROTO_IPV4, |
e2cf5ecb | 214 | .match = addrtype_mt_v0, |
de81bbea | 215 | .matchsize = sizeof(struct xt_addrtype_info), |
e2cf5ecb LAT |
216 | .me = THIS_MODULE |
217 | }, | |
218 | { | |
219 | .name = "addrtype", | |
2f5dc631 | 220 | .family = NFPROTO_UNSPEC, |
e2cf5ecb LAT |
221 | .revision = 1, |
222 | .match = addrtype_mt_v1, | |
223 | .checkentry = addrtype_mt_checkentry_v1, | |
de81bbea | 224 | .matchsize = sizeof(struct xt_addrtype_info_v1), |
e2cf5ecb LAT |
225 | .me = THIS_MODULE |
226 | } | |
1da177e4 LT |
227 | }; |
228 | ||
d3c5ee6d | 229 | static int __init addrtype_mt_init(void) |
1da177e4 | 230 | { |
e2cf5ecb LAT |
231 | return xt_register_matches(addrtype_mt_reg, |
232 | ARRAY_SIZE(addrtype_mt_reg)); | |
1da177e4 LT |
233 | } |
234 | ||
d3c5ee6d | 235 | static void __exit addrtype_mt_exit(void) |
1da177e4 | 236 | { |
e2cf5ecb | 237 | xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg)); |
1da177e4 LT |
238 | } |
239 | ||
d3c5ee6d JE |
240 | module_init(addrtype_mt_init); |
241 | module_exit(addrtype_mt_exit); |