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