inet: Call skb_orphan before tproxy activates
[linux-2.6.git] / 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 <net/ipv6.h>
7
8 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
9
10 static 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
26 int __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 */
53         if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
54                 return (IPV6_ADDR_UNICAST |
55                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));                  /* RFC 4193 */
56
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 }
78 EXPORT_SYMBOL(__ipv6_addr_type);
79