1 /*
2 * IPv6 library code, needed by static components when full IPv6 support is
3 * not configured or static.
4 */
5
6 #include <linux/export.h>
7 #include <net/ipv6.h>
8
9 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
10
11 static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
12 {
13 switch (scope) {
14 case IPV6_ADDR_SCOPE_NODELOCAL:
15 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
16 IPV6_ADDR_LOOPBACK);
17 case IPV6_ADDR_SCOPE_LINKLOCAL:
18 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
19 IPV6_ADDR_LINKLOCAL);
20 case IPV6_ADDR_SCOPE_SITELOCAL:
21 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
22 IPV6_ADDR_SITELOCAL);
23 }
24 return IPV6_ADDR_SCOPE_TYPE(scope);
25 }
26
27 int __ipv6_addr_type(const struct in6_addr *addr)
28 {
29 __be32 st;
30
31 st = addr->s6_addr32[0];
32
33 /* Consider all addresses with the first three bits different of
34 000 and 111 as unicasts.
35 */
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));
40
41 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
42 /* multicast */
43 /* addr-select 3.1 */
44 return (IPV6_ADDR_MULTICAST |
45 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
46 }
47
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 */
57
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)
61 return IPV6_ADDR_ANY;
62
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 */
66
67 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
68 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
69 }
70
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 */
74 }
75
76 return (IPV6_ADDR_UNICAST |
77 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
78 }
79 EXPORT_SYMBOL(__ipv6_addr_type);
80
81 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
82
83 int register_inet6addr_notifier(struct notifier_block *nb)
84 {
85 return atomic_notifier_chain_register(&inet6addr_chain, nb);
86 }
87 EXPORT_SYMBOL(register_inet6addr_notifier);
88
89 int unregister_inet6addr_notifier(struct notifier_block *nb)
90 {
91 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
92 }
93 EXPORT_SYMBOL(unregister_inet6addr_notifier);
94
95 int inet6addr_notifier_call_chain(unsigned long val, void *v)
96 {
97 return atomic_notifier_call_chain(&inet6addr_chain, val, v);
98 }
99 EXPORT_SYMBOL(inet6addr_notifier_call_chain);
100
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