2 * IPv6 library code, needed by static components when full IPv6 support is
3 * not configured or static.
6 #include <linux/export.h>
9 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
11 static inline unsigned ipv6_addr_scope2type(unsigned scope)
14 case IPV6_ADDR_SCOPE_NODELOCAL:
15 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
17 case IPV6_ADDR_SCOPE_LINKLOCAL:
18 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
20 case IPV6_ADDR_SCOPE_SITELOCAL:
21 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
24 return IPV6_ADDR_SCOPE_TYPE(scope);
27 int __ipv6_addr_type(const struct in6_addr *addr)
31 st = addr->s6_addr32[0];
33 /* Consider all addresses with the first three bits different of
34 000 and 111 as unicasts.
36 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
37 (st & htonl(0xE0000000)) != htonl(0xE0000000))
38 return (IPV6_ADDR_UNICAST |
39 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
41 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
44 return (IPV6_ADDR_MULTICAST |
45 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
48 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
49 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
50 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
51 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
52 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
53 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
54 if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
55 return (IPV6_ADDR_UNICAST |
56 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
58 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
59 if (addr->s6_addr32[2] == 0) {
60 if (addr->s6_addr32[3] == 0)
63 if (addr->s6_addr32[3] == htonl(0x00000001))
64 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
65 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
67 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
68 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
71 if (addr->s6_addr32[2] == htonl(0x0000ffff))
72 return (IPV6_ADDR_MAPPED |
73 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
76 return (IPV6_ADDR_UNICAST |
77 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
79 EXPORT_SYMBOL(__ipv6_addr_type);