1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IPv6 library code, needed by static components when full IPv6 support is 4 * not configured or static. 5 */ 6 7 #include <linux/export.h> 8 #include <net/ipv6.h> 9 #include <net/ipv6_stubs.h> 10 #include <net/addrconf.h> 11 #include <net/ip.h> 12 13 /* if ipv6 module registers this function is used by xfrm to force all 14 * sockets to relookup their nodes - this is fairly expensive, be 15 * careful 16 */ 17 void (*__fib6_flush_trees)(struct net *); 18 EXPORT_SYMBOL(__fib6_flush_trees); 19 20 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) 21 22 static inline unsigned int ipv6_addr_scope2type(unsigned int scope) 23 { 24 switch (scope) { 25 case IPV6_ADDR_SCOPE_NODELOCAL: 26 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | 27 IPV6_ADDR_LOOPBACK); 28 case IPV6_ADDR_SCOPE_LINKLOCAL: 29 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | 30 IPV6_ADDR_LINKLOCAL); 31 case IPV6_ADDR_SCOPE_SITELOCAL: 32 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | 33 IPV6_ADDR_SITELOCAL); 34 } 35 return IPV6_ADDR_SCOPE_TYPE(scope); 36 } 37 38 int __ipv6_addr_type(const struct in6_addr *addr) 39 { 40 __be32 st; 41 42 st = addr->s6_addr32[0]; 43 44 /* Consider all addresses with the first three bits different of 45 000 and 111 as unicasts. 46 */ 47 if ((st & htonl(0xE0000000)) != htonl(0x00000000) && 48 (st & htonl(0xE0000000)) != htonl(0xE0000000)) 49 return (IPV6_ADDR_UNICAST | 50 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); 51 52 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { 53 /* multicast */ 54 /* addr-select 3.1 */ 55 return (IPV6_ADDR_MULTICAST | 56 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); 57 } 58 59 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000)) 60 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 61 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */ 62 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000)) 63 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST | 64 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */ 65 if ((st & htonl(0xFE000000)) == htonl(0xFC000000)) 66 return (IPV6_ADDR_UNICAST | 67 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */ 68 69 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { 70 if (addr->s6_addr32[2] == 0) { 71 if (addr->s6_addr32[3] == 0) 72 return IPV6_ADDR_ANY; 73 74 if (addr->s6_addr32[3] == htonl(0x00000001)) 75 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST | 76 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */ 77 78 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | 79 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 80 } 81 82 if (addr->s6_addr32[2] == htonl(0x0000ffff)) 83 return (IPV6_ADDR_MAPPED | 84 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ 85 } 86 87 return (IPV6_ADDR_UNICAST | 88 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ 89 } 90 EXPORT_SYMBOL(__ipv6_addr_type); 91 92 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 93 static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain); 94 95 int register_inet6addr_notifier(struct notifier_block *nb) 96 { 97 return atomic_notifier_chain_register(&inet6addr_chain, nb); 98 } 99 EXPORT_SYMBOL(register_inet6addr_notifier); 100 101 int unregister_inet6addr_notifier(struct notifier_block *nb) 102 { 103 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 104 } 105 EXPORT_SYMBOL(unregister_inet6addr_notifier); 106 107 int inet6addr_notifier_call_chain(unsigned long val, void *v) 108 { 109 return atomic_notifier_call_chain(&inet6addr_chain, val, v); 110 } 111 EXPORT_SYMBOL(inet6addr_notifier_call_chain); 112 113 int register_inet6addr_validator_notifier(struct notifier_block *nb) 114 { 115 return blocking_notifier_chain_register(&inet6addr_validator_chain, nb); 116 } 117 EXPORT_SYMBOL(register_inet6addr_validator_notifier); 118 119 int unregister_inet6addr_validator_notifier(struct notifier_block *nb) 120 { 121 return blocking_notifier_chain_unregister(&inet6addr_validator_chain, 122 nb); 123 } 124 EXPORT_SYMBOL(unregister_inet6addr_validator_notifier); 125 126 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v) 127 { 128 return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v); 129 } 130 EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain); 131 132 static struct dst_entry *eafnosupport_ipv6_dst_lookup_flow(struct net *net, 133 const struct sock *sk, 134 struct flowi6 *fl6, 135 const struct in6_addr *final_dst) 136 { 137 return ERR_PTR(-EAFNOSUPPORT); 138 } 139 140 static int eafnosupport_ipv6_route_input(struct sk_buff *skb) 141 { 142 return -EAFNOSUPPORT; 143 } 144 145 static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id) 146 { 147 return NULL; 148 } 149 150 static int 151 eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table, 152 int oif, struct flowi6 *fl6, 153 struct fib6_result *res, int flags) 154 { 155 return -EAFNOSUPPORT; 156 } 157 158 static int 159 eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6, 160 struct fib6_result *res, int flags) 161 { 162 return -EAFNOSUPPORT; 163 } 164 165 static void 166 eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res, 167 struct flowi6 *fl6, int oif, bool have_oif_match, 168 const struct sk_buff *skb, int strict) 169 { 170 } 171 172 static u32 173 eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res, 174 const struct in6_addr *daddr, 175 const struct in6_addr *saddr) 176 { 177 return 0; 178 } 179 180 static int eafnosupport_fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, 181 struct fib6_config *cfg, gfp_t gfp_flags, 182 struct netlink_ext_ack *extack) 183 { 184 NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel"); 185 return -EAFNOSUPPORT; 186 } 187 188 static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt, 189 bool skip_notify) 190 { 191 return -EAFNOSUPPORT; 192 } 193 194 const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) { 195 .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow, 196 .ipv6_route_input = eafnosupport_ipv6_route_input, 197 .fib6_get_table = eafnosupport_fib6_get_table, 198 .fib6_table_lookup = eafnosupport_fib6_table_lookup, 199 .fib6_lookup = eafnosupport_fib6_lookup, 200 .fib6_select_path = eafnosupport_fib6_select_path, 201 .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6, 202 .fib6_nh_init = eafnosupport_fib6_nh_init, 203 .ip6_del_rt = eafnosupport_ip6_del_rt, 204 }; 205 EXPORT_SYMBOL_GPL(ipv6_stub); 206 207 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 208 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 209 EXPORT_SYMBOL(in6addr_loopback); 210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 211 EXPORT_SYMBOL(in6addr_any); 212 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 213 EXPORT_SYMBOL(in6addr_linklocal_allnodes); 214 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 215 EXPORT_SYMBOL(in6addr_linklocal_allrouters); 216 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 217 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes); 218 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 219 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters); 220 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 221 EXPORT_SYMBOL(in6addr_sitelocal_allrouters); 222 223 static void snmp6_free_dev(struct inet6_dev *idev) 224 { 225 kfree(idev->stats.icmpv6msgdev); 226 kfree(idev->stats.icmpv6dev); 227 free_percpu(idev->stats.ipv6); 228 } 229 230 static void in6_dev_finish_destroy_rcu(struct rcu_head *head) 231 { 232 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); 233 234 snmp6_free_dev(idev); 235 kfree(idev); 236 } 237 238 /* Nobody refers to this device, we may destroy it. */ 239 240 void in6_dev_finish_destroy(struct inet6_dev *idev) 241 { 242 struct net_device *dev = idev->dev; 243 244 WARN_ON(!list_empty(&idev->addr_list)); 245 WARN_ON(idev->mc_list); 246 WARN_ON(timer_pending(&idev->rs_timer)); 247 248 #ifdef NET_REFCNT_DEBUG 249 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 250 #endif 251 dev_put(dev); 252 if (!idev->dead) { 253 pr_warn("Freeing alive inet6 device %p\n", idev); 254 return; 255 } 256 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu); 257 } 258 EXPORT_SYMBOL(in6_dev_finish_destroy); 259