blob: 3f82e9542edab8840b7b715cda58e6a719950459 [file] [log] [blame]
YOSHIFUJI Hideaki8c14b7c2007-02-22 02:25:42 +09001/*
2 * IPv6 library code, needed by static components when full IPv6 support is
3 * not configured or static.
4 */
5
6#include <net/ipv6.h>
7
8#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
9
10static inline unsigned ipv6_addr_scope2type(unsigned scope)
11{
12 switch(scope) {
13 case IPV6_ADDR_SCOPE_NODELOCAL:
14 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
15 IPV6_ADDR_LOOPBACK);
16 case IPV6_ADDR_SCOPE_LINKLOCAL:
17 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
18 IPV6_ADDR_LINKLOCAL);
19 case IPV6_ADDR_SCOPE_SITELOCAL:
20 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
21 IPV6_ADDR_SITELOCAL);
22 }
23 return IPV6_ADDR_SCOPE_TYPE(scope);
24}
25
26int __ipv6_addr_type(const struct in6_addr *addr)
27{
28 __be32 st;
29
30 st = addr->s6_addr32[0];
31
32 /* Consider all addresses with the first three bits different of
33 000 and 111 as unicasts.
34 */
35 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
36 (st & htonl(0xE0000000)) != htonl(0xE0000000))
37 return (IPV6_ADDR_UNICAST |
38 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
39
40 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
41 /* multicast */
42 /* addr-select 3.1 */
43 return (IPV6_ADDR_MULTICAST |
44 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
45 }
46
47 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
48 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
49 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
50 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
51 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
52 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
Dave Johnsonc61a7d12007-07-30 17:19:31 -070053 if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
54 return (IPV6_ADDR_UNICAST |
55 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
YOSHIFUJI Hideaki8c14b7c2007-02-22 02:25:42 +090056
57 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
58 if (addr->s6_addr32[2] == 0) {
59 if (addr->s6_addr32[3] == 0)
60 return IPV6_ADDR_ANY;
61
62 if (addr->s6_addr32[3] == htonl(0x00000001))
63 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
64 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
65
66 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
67 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
68 }
69
70 if (addr->s6_addr32[2] == htonl(0x0000ffff))
71 return (IPV6_ADDR_MAPPED |
72 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
73 }
74
75 return (IPV6_ADDR_RESERVED |
76 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
77}
David S. Miller74010552007-02-21 23:26:56 -080078EXPORT_SYMBOL(__ipv6_addr_type);
YOSHIFUJI Hideaki8c14b7c2007-02-22 02:25:42 +090079