1 #include <linux/version.h>
2 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
5 * IPv6 library code, needed by static components when full IPv6 support is
6 * not configured or static.
11 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
13 static inline unsigned ipv6_addr_scope2type(unsigned scope)
16 case IPV6_ADDR_SCOPE_NODELOCAL:
17 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
19 case IPV6_ADDR_SCOPE_LINKLOCAL:
20 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
22 case IPV6_ADDR_SCOPE_SITELOCAL:
23 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
26 return IPV6_ADDR_SCOPE_TYPE(scope);
29 int __ipv6_addr_type(const struct in6_addr *addr)
33 st = addr->s6_addr32[0];
35 /* Consider all addresses with the first three bits different of
36 000 and 111 as unicasts.
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));
43 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
46 return (IPV6_ADDR_MULTICAST |
47 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
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 */
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)
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 */
69 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
70 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
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 */
78 return (IPV6_ADDR_RESERVED |
79 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
82 #endif /* kernel < 2.6.21 */