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 #include <net/ip.h> 10 11 /* if ipv6 module registers this function is used by xfrm to force all 12 * sockets to relookup their nodes - this is fairly expensive, be 13 * careful 14 */ 15 void (*__fib6_flush_trees)(struct net *); 16 EXPORT_SYMBOL(__fib6_flush_trees); 17 18 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 19 20 static inline unsigned int ipv6_addr_scope2type(unsigned int scope) 21 { 22 switch (scope) { 23 case IPV6_ADDR_SCOPE_NODELOCAL: 24 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 25 IPV6_ADDR_LOOPBACK); 26 case IPV6_ADDR_SCOPE_LINKLOCAL: 27 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 28 IPV6_ADDR_LINKLOCAL); 29 case IPV6_ADDR_SCOPE_SITELOCAL: 30 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 31 IPV6_ADDR_SITELOCAL); 32 } 33 return IPV6_ADDR_SCOPE_TYPE(scope); 34 } 35 36 int __ipv6_addr_type(const struct in6_addr *addr) 37 { 38 __be32 st; 39 40 st = addr->s6_addr32[0]; 41 42 /* Consider all addresses with the first three bits different of 43 000 and 111 as unicasts. 44 */ 45 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 46 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 47 return (IPV6_ADDR_UNICAST | 48 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 49 50 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 51 /* multicast */ 52 /* addr-select 3.1 */ 53 return (IPV6_ADDR_MULTICAST | 54 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 55 } 56 57 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 58 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 59 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 60 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 61 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 62 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 63 if ((st & htonl(0xFE000000)) == htonl(0xFC000000)) 64 return (IPV6_ADDR_UNICAST | 65 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */ 66 67 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 68 if (addr->s6_addr32[2] == 0) { 69 if (addr->s6_addr32[3] == 0) 70 return IPV6_ADDR_ANY; 71 72 if (addr->s6_addr32[3] == htonl(0x00000001)) 73 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 74 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 75 76 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 77 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 78 } 79 80 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 81 return (IPV6_ADDR_MAPPED | 82 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 83 } 84 85 return (IPV6_ADDR_UNICAST | 86 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 87 } 88 EXPORT_SYMBOL(__ipv6_addr_type); 89 90 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 91 92 int register_inet6addr_notifier(struct notifier_block *nb) 93 { 94 return atomic_notifier_chain_register(&inet6addr_chain, nb); 95 } 96 EXPORT_SYMBOL(register_inet6addr_notifier); 97 98 int unregister_inet6addr_notifier(struct notifier_block *nb) 99 { 100 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 101 } 102 EXPORT_SYMBOL(unregister_inet6addr_notifier); 103 104 int inet6addr_notifier_call_chain(unsigned long val, void *v) 105 { 106 return atomic_notifier_call_chain(&inet6addr_chain, val, v); 107 } 108 EXPORT_SYMBOL(inet6addr_notifier_call_chain); 109 110 static int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1, 111 struct dst_entry **u2, 112 struct flowi6 *u3) 113 { 114 return -EAFNOSUPPORT; 115 } 116 117 const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) { 118 .ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup, 119 }; 120 EXPORT_SYMBOL_GPL(ipv6_stub); 121 122 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 123 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 124 EXPORT_SYMBOL(in6addr_loopback); 125 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 126 EXPORT_SYMBOL(in6addr_any); 127 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 128 EXPORT_SYMBOL(in6addr_linklocal_allnodes); 129 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 130 EXPORT_SYMBOL(in6addr_linklocal_allrouters); 131 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 132 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes); 133 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 134 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters); 135 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 136 EXPORT_SYMBOL(in6addr_sitelocal_allrouters); 137 138 static void snmp6_free_dev(struct inet6_dev *idev) 139 { 140 kfree(idev->stats.icmpv6msgdev); 141 kfree(idev->stats.icmpv6dev); 142 free_percpu(idev->stats.ipv6); 143 } 144 145 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 146 { 147 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 148 149 snmp6_free_dev(idev); 150 kfree(idev); 151 } 152 153 /* Nobody refers to this device, we may destroy it. */ 154 155 void in6_dev_finish_destroy(struct inet6_dev *idev) 156 { 157 struct net_device *dev = idev->dev; 158 159 WARN_ON(!list_empty(&idev->addr_list)); 160 WARN_ON(idev->mc_list); 161 WARN_ON(timer_pending(&idev->rs_timer)); 162 163 #ifdef NET_REFCNT_DEBUG 164 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 165 #endif 166 dev_put(dev); 167 if (!idev->dead) { 168 pr_warn("Freeing alive inet6 device %p\n", idev); 169 return; 170 } 171 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 172 } 173 EXPORT_SYMBOL(in6_dev_finish_destroy); 174