datapath/linux/compat/addrconf_core-openvswitch.c

   1 #include <linux/version.h>
   2 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
   3
   4 /*
   5  * IPv6 library code, needed by static components when full IPv6 support is
   6  * not configured or static.
   7  */
   8
   9 #include <net/ipv6.h>
  10
  11 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
  12
  13 static inline unsigned ipv6_addr_scope2type(unsigned 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_RESERVED |
  79                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
  80 }
  81
  82 #endif /* kernel < 2.6.21 */