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TOMOYO Linux Cross Reference
Linux/net/ipv6/addrconf_core.c

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  1 /*
  2  * IPv6 library code, needed by static components when full IPv6 support is
  3  * not configured or static.
  4  */
  5 
  6 #include <linux/export.h>
  7 #include <net/ipv6.h>
  8 #include <net/addrconf.h>
  9 #include <net/ip.h>
 10 
 11 /* if ipv6 module registers this function is used by xfrm to force all
 12  * sockets to relookup their nodes - this is fairly expensive, be
 13  * careful
 14  */
 15 void (*__fib6_flush_trees)(struct net *);
 16 EXPORT_SYMBOL(__fib6_flush_trees);
 17 
 18 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 19 
 20 static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
 21 {
 22         switch (scope) {
 23         case IPV6_ADDR_SCOPE_NODELOCAL:
 24                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 25                         IPV6_ADDR_LOOPBACK);
 26         case IPV6_ADDR_SCOPE_LINKLOCAL:
 27                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 28                         IPV6_ADDR_LINKLOCAL);
 29         case IPV6_ADDR_SCOPE_SITELOCAL:
 30                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 31                         IPV6_ADDR_SITELOCAL);
 32         }
 33         return IPV6_ADDR_SCOPE_TYPE(scope);
 34 }
 35 
 36 int __ipv6_addr_type(const struct in6_addr *addr)
 37 {
 38         __be32 st;
 39 
 40         st = addr->s6_addr32[0];
 41 
 42         /* Consider all addresses with the first three bits different of
 43            000 and 111 as unicasts.
 44          */
 45         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 46             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 47                 return (IPV6_ADDR_UNICAST |
 48                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 49 
 50         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 51                 /* multicast */
 52                 /* addr-select 3.1 */
 53                 return (IPV6_ADDR_MULTICAST |
 54                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 55         }
 56 
 57         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 58                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 59                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 60         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 61                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 62                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 63         if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
 64                 return (IPV6_ADDR_UNICAST |
 65                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));                  /* RFC 4193 */
 66 
 67         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 68                 if (addr->s6_addr32[2] == 0) {
 69                         if (addr->s6_addr32[3] == 0)
 70                                 return IPV6_ADDR_ANY;
 71 
 72                         if (addr->s6_addr32[3] == htonl(0x00000001))
 73                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 74                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 75 
 76                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 77                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 78                 }
 79 
 80                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 81                         return (IPV6_ADDR_MAPPED |
 82                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 83         }
 84 
 85         return (IPV6_ADDR_UNICAST |
 86                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 87 }
 88 EXPORT_SYMBOL(__ipv6_addr_type);
 89 
 90 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 91 
 92 int register_inet6addr_notifier(struct notifier_block *nb)
 93 {
 94         return atomic_notifier_chain_register(&inet6addr_chain, nb);
 95 }
 96 EXPORT_SYMBOL(register_inet6addr_notifier);
 97 
 98 int unregister_inet6addr_notifier(struct notifier_block *nb)
 99 {
100         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
101 }
102 EXPORT_SYMBOL(unregister_inet6addr_notifier);
103 
104 int inet6addr_notifier_call_chain(unsigned long val, void *v)
105 {
106         return atomic_notifier_call_chain(&inet6addr_chain, val, v);
107 }
108 EXPORT_SYMBOL(inet6addr_notifier_call_chain);
109 
110 static int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1,
111                                         struct dst_entry **u2,
112                                         struct flowi6 *u3)
113 {
114         return -EAFNOSUPPORT;
115 }
116 
117 const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
118         .ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
119 };
120 EXPORT_SYMBOL_GPL(ipv6_stub);
121 
122 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
123 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
124 EXPORT_SYMBOL(in6addr_loopback);
125 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
126 EXPORT_SYMBOL(in6addr_any);
127 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
128 EXPORT_SYMBOL(in6addr_linklocal_allnodes);
129 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
130 EXPORT_SYMBOL(in6addr_linklocal_allrouters);
131 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
132 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
133 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
134 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
135 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
136 EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
137 
138 static void snmp6_free_dev(struct inet6_dev *idev)
139 {
140         kfree(idev->stats.icmpv6msgdev);
141         kfree(idev->stats.icmpv6dev);
142         free_percpu(idev->stats.ipv6);
143 }
144 
145 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
146 {
147         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
148 
149         snmp6_free_dev(idev);
150         kfree(idev);
151 }
152 
153 /* Nobody refers to this device, we may destroy it. */
154 
155 void in6_dev_finish_destroy(struct inet6_dev *idev)
156 {
157         struct net_device *dev = idev->dev;
158 
159         WARN_ON(!list_empty(&idev->addr_list));
160         WARN_ON(idev->mc_list);
161         WARN_ON(timer_pending(&idev->rs_timer));
162 
163 #ifdef NET_REFCNT_DEBUG
164         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
165 #endif
166         dev_put(dev);
167         if (!idev->dead) {
168                 pr_warn("Freeing alive inet6 device %p\n", idev);
169                 return;
170         }
171         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
172 }
173 EXPORT_SYMBOL(in6_dev_finish_destroy);
174 

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