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 #include <net/addrconf.h> 9 10 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 11 12 static inline unsigned int ipv6_addr_scope2type(unsigned int scope) 13 { 14 switch (scope) { 15 case IPV6_ADDR_SCOPE_NODELOCAL: 16 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 17 IPV6_ADDR_LOOPBACK); 18 case IPV6_ADDR_SCOPE_LINKLOCAL: 19 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 20 IPV6_ADDR_LINKLOCAL); 21 case IPV6_ADDR_SCOPE_SITELOCAL: 22 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 23 IPV6_ADDR_SITELOCAL); 24 } 25 return IPV6_ADDR_SCOPE_TYPE(scope); 26 } 27 28 int __ipv6_addr_type(const struct in6_addr *addr) 29 { 30 __be32 st; 31 32 st = addr->s6_addr32[0]; 33 34 /* Consider all addresses with the first three bits different of 35 000 and 111 as unicasts. 36 */ 37 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 38 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 39 return (IPV6_ADDR_UNICAST | 40 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 41 42 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 43 /* multicast */ 44 /* addr-select 3.1 */ 45 return (IPV6_ADDR_MULTICAST | 46 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 47 } 48 49 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 50 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 51 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 52 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 53 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 54 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 55 if ((st & htonl(0xFE000000)) == htonl(0xFC000000)) 56 return (IPV6_ADDR_UNICAST | 57 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */ 58 59 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 60 if (addr->s6_addr32[2] == 0) { 61 if (addr->s6_addr32[3] == 0) 62 return IPV6_ADDR_ANY; 63 64 if (addr->s6_addr32[3] == htonl(0x00000001)) 65 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 66 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 67 68 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 69 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 70 } 71 72 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 73 return (IPV6_ADDR_MAPPED | 74 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 75 } 76 77 return (IPV6_ADDR_UNICAST | 78 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 79 } 80 EXPORT_SYMBOL(__ipv6_addr_type); 81 82 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 83 84 int register_inet6addr_notifier(struct notifier_block *nb) 85 { 86 return atomic_notifier_chain_register(&inet6addr_chain, nb); 87 } 88 EXPORT_SYMBOL(register_inet6addr_notifier); 89 90 int unregister_inet6addr_notifier(struct notifier_block *nb) 91 { 92 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 93 } 94 EXPORT_SYMBOL(unregister_inet6addr_notifier); 95 96 int inet6addr_notifier_call_chain(unsigned long val, void *v) 97 { 98 return atomic_notifier_call_chain(&inet6addr_chain, val, v); 99 } 100 EXPORT_SYMBOL(inet6addr_notifier_call_chain); 101