net/ipv6/addrconf_core.c

   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 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
  12
  13 static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
  14 {
  15         switch (scope) {
  16         case IPV6_ADDR_SCOPE_NODELOCAL:
  17                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
  18                         IPV6_ADDR_LOOPBACK);
  19         case IPV6_ADDR_SCOPE_LINKLOCAL:
  20                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
  21                         IPV6_ADDR_LINKLOCAL);
  22         case IPV6_ADDR_SCOPE_SITELOCAL:
  23                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
  24                         IPV6_ADDR_SITELOCAL);
  25         }
  26         return IPV6_ADDR_SCOPE_TYPE(scope);
  27 }
  28
  29 int __ipv6_addr_type(const struct in6_addr *addr)
  30 {
  31         __be32 st;
  32
  33         st = addr->s6_addr32[0];
  34
  35         /* Consider all addresses with the first three bits different of
  36            000 and 111 as unicasts.
  37          */
  38         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
  39             (st & htonl(0xE0000000)) != htonl(0xE0000000))
  40                 return (IPV6_ADDR_UNICAST |
  41                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
  42
  43         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
  44                 /* multicast */
  45                 /* addr-select 3.1 */
  46                 return (IPV6_ADDR_MULTICAST |
  47                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
  48         }
  49
  50         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
  51                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
  52                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
  53         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
  54                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
  55                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
  56         if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
  57                 return (IPV6_ADDR_UNICAST |
  58                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));                  /* RFC 4193 */
  59
  60         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
  61                 if (addr->s6_addr32[2] == 0) {
  62                         if (addr->s6_addr32[3] == 0)
  63                                 return IPV6_ADDR_ANY;
  64
  65                         if (addr->s6_addr32[3] == htonl(0x00000001))
  66                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
  67                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
  68
  69                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
  70                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
  71                 }
  72
  73                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
  74                         return (IPV6_ADDR_MAPPED |
  75                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
  76         }
  77
  78         return (IPV6_ADDR_UNICAST |
  79                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
  80 }
  81 EXPORT_SYMBOL(__ipv6_addr_type);
  82
  83 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
  84
  85 int register_inet6addr_notifier(struct notifier_block *nb)
  86 {
  87         return atomic_notifier_chain_register(&inet6addr_chain, nb);
  88 }
  89 EXPORT_SYMBOL(register_inet6addr_notifier);
  90
  91 int unregister_inet6addr_notifier(struct notifier_block *nb)
  92 {
  93         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
  94 }
  95 EXPORT_SYMBOL(unregister_inet6addr_notifier);
  96
  97 int inet6addr_notifier_call_chain(unsigned long val, void *v)
  98 {
  99         return atomic_notifier_call_chain(&inet6addr_chain, val, v);
 100 }
 101 EXPORT_SYMBOL(inet6addr_notifier_call_chain);
 102
 103 const struct ipv6_stub *ipv6_stub __read_mostly;
 104 EXPORT_SYMBOL_GPL(ipv6_stub);
 105
 106 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 107 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 108 EXPORT_SYMBOL(in6addr_loopback);
 109 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 110 EXPORT_SYMBOL(in6addr_any);
 111 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 112 EXPORT_SYMBOL(in6addr_linklocal_allnodes);
 113 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 114 EXPORT_SYMBOL(in6addr_linklocal_allrouters);
 115 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
 116 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
 117 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
 118 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
 119 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
 120 EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
 121
 122 static void snmp6_free_dev(struct inet6_dev *idev)
 123 {
 124         kfree(idev->stats.icmpv6msgdev);
 125         kfree(idev->stats.icmpv6dev);
 126         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 127 }
 128
 129 /* Nobody refers to this device, we may destroy it. */
 130
 131 void in6_dev_finish_destroy(struct inet6_dev *idev)
 132 {
 133         struct net_device *dev = idev->dev;
 134
 135         WARN_ON(!list_empty(&idev->addr_list));
 136         WARN_ON(idev->mc_list != NULL);
 137         WARN_ON(timer_pending(&idev->rs_timer));
 138
 139 #ifdef NET_REFCNT_DEBUG
 140         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
 141 #endif
 142         dev_put(dev);
 143         if (!idev->dead) {
 144                 pr_warn("Freeing alive inet6 device %p\n", idev);
 145                 return;
 146         }
 147         snmp6_free_dev(idev);
 148         kfree_rcu(idev, rcu);
 149 }
 150 EXPORT_SYMBOL(in6_dev_finish_destroy);