ipv6,mcast: always hold idev->lock before mca_lock
[linux-3.10.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 <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);