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Linux/net/netfilter/xt_addrtype.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  iptables module to match inet_addr_type() of an ip.
  4  *
  5  *  Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
  6  *  (C) 2007 Laszlo Attila Toth <panther@balabit.hu>
  7  */
  8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/skbuff.h>
 12 #include <linux/netdevice.h>
 13 #include <linux/ip.h>
 14 #include <net/route.h>
 15 
 16 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 17 #include <net/ipv6.h>
 18 #include <net/ip6_route.h>
 19 #include <net/ip6_fib.h>
 20 #endif
 21 
 22 #include <linux/netfilter_ipv6.h>
 23 #include <linux/netfilter/xt_addrtype.h>
 24 #include <linux/netfilter/x_tables.h>
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 28 MODULE_DESCRIPTION("Xtables: address type match");
 29 MODULE_ALIAS("ipt_addrtype");
 30 MODULE_ALIAS("ip6t_addrtype");
 31 
 32 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 33 static u32 match_lookup_rt6(struct net *net, const struct net_device *dev,
 34                             const struct in6_addr *addr, u16 mask)
 35 {
 36         struct flowi6 flow;
 37         struct rt6_info *rt;
 38         u32 ret = 0;
 39         int route_err;
 40 
 41         memset(&flow, 0, sizeof(flow));
 42         flow.daddr = *addr;
 43         if (dev)
 44                 flow.flowi6_oif = dev->ifindex;
 45 
 46         if (dev && (mask & XT_ADDRTYPE_LOCAL)) {
 47                 if (nf_ipv6_chk_addr(net, addr, dev, true))
 48                         ret = XT_ADDRTYPE_LOCAL;
 49         }
 50 
 51         route_err = nf_ip6_route(net, (struct dst_entry **)&rt,
 52                                  flowi6_to_flowi(&flow), false);
 53         if (route_err)
 54                 return XT_ADDRTYPE_UNREACHABLE;
 55 
 56         if (rt->rt6i_flags & RTF_REJECT)
 57                 ret = XT_ADDRTYPE_UNREACHABLE;
 58 
 59         if (dev == NULL && rt->rt6i_flags & RTF_LOCAL)
 60                 ret |= XT_ADDRTYPE_LOCAL;
 61         if (ipv6_anycast_destination((struct dst_entry *)rt, addr))
 62                 ret |= XT_ADDRTYPE_ANYCAST;
 63 
 64         dst_release(&rt->dst);
 65         return ret;
 66 }
 67 
 68 static bool match_type6(struct net *net, const struct net_device *dev,
 69                                 const struct in6_addr *addr, u16 mask)
 70 {
 71         int addr_type = ipv6_addr_type(addr);
 72 
 73         if ((mask & XT_ADDRTYPE_MULTICAST) &&
 74             !(addr_type & IPV6_ADDR_MULTICAST))
 75                 return false;
 76         if ((mask & XT_ADDRTYPE_UNICAST) && !(addr_type & IPV6_ADDR_UNICAST))
 77                 return false;
 78         if ((mask & XT_ADDRTYPE_UNSPEC) && addr_type != IPV6_ADDR_ANY)
 79                 return false;
 80 
 81         if ((XT_ADDRTYPE_LOCAL | XT_ADDRTYPE_ANYCAST |
 82              XT_ADDRTYPE_UNREACHABLE) & mask)
 83                 return !!(mask & match_lookup_rt6(net, dev, addr, mask));
 84         return true;
 85 }
 86 
 87 static bool
 88 addrtype_mt6(struct net *net, const struct net_device *dev,
 89         const struct sk_buff *skb, const struct xt_addrtype_info_v1 *info)
 90 {
 91         const struct ipv6hdr *iph = ipv6_hdr(skb);
 92         bool ret = true;
 93 
 94         if (info->source)
 95                 ret &= match_type6(net, dev, &iph->saddr, info->source) ^
 96                        (info->flags & XT_ADDRTYPE_INVERT_SOURCE);
 97         if (ret && info->dest)
 98                 ret &= match_type6(net, dev, &iph->daddr, info->dest) ^
 99                        !!(info->flags & XT_ADDRTYPE_INVERT_DEST);
100         return ret;
101 }
102 #endif
103 
104 static inline bool match_type(struct net *net, const struct net_device *dev,
105                               __be32 addr, u_int16_t mask)
106 {
107         return !!(mask & (1 << inet_dev_addr_type(net, dev, addr)));
108 }
109 
110 static bool
111 addrtype_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
112 {
113         struct net *net = xt_net(par);
114         const struct xt_addrtype_info *info = par->matchinfo;
115         const struct iphdr *iph = ip_hdr(skb);
116         bool ret = true;
117 
118         if (info->source)
119                 ret &= match_type(net, NULL, iph->saddr, info->source) ^
120                        info->invert_source;
121         if (info->dest)
122                 ret &= match_type(net, NULL, iph->daddr, info->dest) ^
123                        info->invert_dest;
124 
125         return ret;
126 }
127 
128 static bool
129 addrtype_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
130 {
131         struct net *net = xt_net(par);
132         const struct xt_addrtype_info_v1 *info = par->matchinfo;
133         const struct iphdr *iph;
134         const struct net_device *dev = NULL;
135         bool ret = true;
136 
137         if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN)
138                 dev = xt_in(par);
139         else if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT)
140                 dev = xt_out(par);
141 
142 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
143         if (xt_family(par) == NFPROTO_IPV6)
144                 return addrtype_mt6(net, dev, skb, info);
145 #endif
146         iph = ip_hdr(skb);
147         if (info->source)
148                 ret &= match_type(net, dev, iph->saddr, info->source) ^
149                        (info->flags & XT_ADDRTYPE_INVERT_SOURCE);
150         if (ret && info->dest)
151                 ret &= match_type(net, dev, iph->daddr, info->dest) ^
152                        !!(info->flags & XT_ADDRTYPE_INVERT_DEST);
153         return ret;
154 }
155 
156 static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
157 {
158         const char *errmsg = "both incoming and outgoing interface limitation cannot be selected";
159         struct xt_addrtype_info_v1 *info = par->matchinfo;
160 
161         if (info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN &&
162             info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT)
163                 goto err;
164 
165         if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) |
166             (1 << NF_INET_LOCAL_IN)) &&
167             info->flags & XT_ADDRTYPE_LIMIT_IFACE_OUT) {
168                 errmsg = "output interface limitation not valid in PREROUTING and INPUT";
169                 goto err;
170         }
171 
172         if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) |
173             (1 << NF_INET_LOCAL_OUT)) &&
174             info->flags & XT_ADDRTYPE_LIMIT_IFACE_IN) {
175                 errmsg = "input interface limitation not valid in POSTROUTING and OUTPUT";
176                 goto err;
177         }
178 
179 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
180         if (par->family == NFPROTO_IPV6) {
181                 if ((info->source | info->dest) & XT_ADDRTYPE_BLACKHOLE) {
182                         errmsg = "ipv6 BLACKHOLE matching not supported";
183                         goto err;
184                 }
185                 if ((info->source | info->dest) >= XT_ADDRTYPE_PROHIBIT) {
186                         errmsg = "ipv6 PROHIBIT (THROW, NAT ..) matching not supported";
187                         goto err;
188                 }
189                 if ((info->source | info->dest) & XT_ADDRTYPE_BROADCAST) {
190                         errmsg = "ipv6 does not support BROADCAST matching";
191                         goto err;
192                 }
193         }
194 #endif
195         return 0;
196 err:
197         pr_info_ratelimited("%s\n", errmsg);
198         return -EINVAL;
199 }
200 
201 static struct xt_match addrtype_mt_reg[] __read_mostly = {
202         {
203                 .name           = "addrtype",
204                 .family         = NFPROTO_IPV4,
205                 .match          = addrtype_mt_v0,
206                 .matchsize      = sizeof(struct xt_addrtype_info),
207                 .me             = THIS_MODULE
208         },
209         {
210                 .name           = "addrtype",
211                 .family         = NFPROTO_UNSPEC,
212                 .revision       = 1,
213                 .match          = addrtype_mt_v1,
214                 .checkentry     = addrtype_mt_checkentry_v1,
215                 .matchsize      = sizeof(struct xt_addrtype_info_v1),
216                 .me             = THIS_MODULE
217         }
218 };
219 
220 static int __init addrtype_mt_init(void)
221 {
222         return xt_register_matches(addrtype_mt_reg,
223                                    ARRAY_SIZE(addrtype_mt_reg));
224 }
225 
226 static void __exit addrtype_mt_exit(void)
227 {
228         xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg));
229 }
230 
231 module_init(addrtype_mt_init);
232 module_exit(addrtype_mt_exit);
233 

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