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 static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain); 92 93 int register_inet6addr_notifier(struct notifier_block *nb) 94 { 95 return atomic_notifier_chain_register(&inet6addr_chain, nb); 96 } 97 EXPORT_SYMBOL(register_inet6addr_notifier); 98 99 int unregister_inet6addr_notifier(struct notifier_block *nb) 100 { 101 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 102 } 103 EXPORT_SYMBOL(unregister_inet6addr_notifier); 104 105 int inet6addr_notifier_call_chain(unsigned long val, void *v) 106 { 107 return atomic_notifier_call_chain(&inet6addr_chain, val, v); 108 } 109 EXPORT_SYMBOL(inet6addr_notifier_call_chain); 110 111 int register_inet6addr_validator_notifier(struct notifier_block *nb) 112 { 113 return blocking_notifier_chain_register(&inet6addr_validator_chain, nb); 114 } 115 EXPORT_SYMBOL(register_inet6addr_validator_notifier); 116 117 int unregister_inet6addr_validator_notifier(struct notifier_block *nb) 118 { 119 return blocking_notifier_chain_unregister(&inet6addr_validator_chain, 120 nb); 121 } 122 EXPORT_SYMBOL(unregister_inet6addr_validator_notifier); 123 124 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v) 125 { 126 return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v); 127 } 128 EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain); 129 130 static int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1, 131 struct dst_entry **u2, 132 struct flowi6 *u3) 133 { 134 return -EAFNOSUPPORT; 135 } 136 137 static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id) 138 { 139 return NULL; 140 } 141 142 static struct fib6_info * 143 eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table, 144 int oif, struct flowi6 *fl6, int flags) 145 { 146 return NULL; 147 } 148 149 static struct fib6_info * 150 eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6, 151 int flags) 152 { 153 return NULL; 154 } 155 156 static struct fib6_info * 157 eafnosupport_fib6_multipath_select(const struct net *net, struct fib6_info *f6i, 158 struct flowi6 *fl6, int oif, 159 const struct sk_buff *skb, int strict) 160 { 161 return f6i; 162 } 163 164 static u32 165 eafnosupport_ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr, 166 struct in6_addr *saddr) 167 { 168 return 0; 169 } 170 171 const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) { 172 .ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup, 173 .fib6_get_table = eafnosupport_fib6_get_table, 174 .fib6_table_lookup = eafnosupport_fib6_table_lookup, 175 .fib6_lookup = eafnosupport_fib6_lookup, 176 .fib6_multipath_select = eafnosupport_fib6_multipath_select, 177 .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6, 178 }; 179 EXPORT_SYMBOL_GPL(ipv6_stub); 180 181 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 182 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 183 EXPORT_SYMBOL(in6addr_loopback); 184 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 185 EXPORT_SYMBOL(in6addr_any); 186 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 187 EXPORT_SYMBOL(in6addr_linklocal_allnodes); 188 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 189 EXPORT_SYMBOL(in6addr_linklocal_allrouters); 190 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 191 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes); 192 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 193 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters); 194 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 195 EXPORT_SYMBOL(in6addr_sitelocal_allrouters); 196 197 static void snmp6_free_dev(struct inet6_dev *idev) 198 { 199 kfree(idev->stats.icmpv6msgdev); 200 kfree(idev->stats.icmpv6dev); 201 free_percpu(idev->stats.ipv6); 202 } 203 204 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 205 { 206 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 207 208 snmp6_free_dev(idev); 209 kfree(idev); 210 } 211 212 /* Nobody refers to this device, we may destroy it. */ 213 214 void in6_dev_finish_destroy(struct inet6_dev *idev) 215 { 216 struct net_device *dev = idev->dev; 217 218 WARN_ON(!list_empty(&idev->addr_list)); 219 WARN_ON(idev->mc_list); 220 WARN_ON(timer_pending(&idev->rs_timer)); 221 222 #ifdef NET_REFCNT_DEBUG 223 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 224 #endif 225 dev_put(dev); 226 if (!idev->dead) { 227 pr_warn("Freeing alive inet6 device %p\n", idev); 228 return; 229 } 230 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 231 } 232 EXPORT_SYMBOL(in6_dev_finish_destroy); 233