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Linux/net/ipv6/addrconf_core.c

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  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 {
190         return -EAFNOSUPPORT;
191 }
192 
193 const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
194         .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow,
195         .ipv6_route_input  = eafnosupport_ipv6_route_input,
196         .fib6_get_table    = eafnosupport_fib6_get_table,
197         .fib6_table_lookup = eafnosupport_fib6_table_lookup,
198         .fib6_lookup       = eafnosupport_fib6_lookup,
199         .fib6_select_path  = eafnosupport_fib6_select_path,
200         .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
201         .fib6_nh_init      = eafnosupport_fib6_nh_init,
202         .ip6_del_rt        = eafnosupport_ip6_del_rt,
203 };
204 EXPORT_SYMBOL_GPL(ipv6_stub);
205 
206 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
207 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
208 EXPORT_SYMBOL(in6addr_loopback);
209 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
210 EXPORT_SYMBOL(in6addr_any);
211 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
212 EXPORT_SYMBOL(in6addr_linklocal_allnodes);
213 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
214 EXPORT_SYMBOL(in6addr_linklocal_allrouters);
215 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
216 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
217 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
218 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
219 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
220 EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
221 
222 static void snmp6_free_dev(struct inet6_dev *idev)
223 {
224         kfree(idev->stats.icmpv6msgdev);
225         kfree(idev->stats.icmpv6dev);
226         free_percpu(idev->stats.ipv6);
227 }
228 
229 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
230 {
231         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
232 
233         snmp6_free_dev(idev);
234         kfree(idev);
235 }
236 
237 /* Nobody refers to this device, we may destroy it. */
238 
239 void in6_dev_finish_destroy(struct inet6_dev *idev)
240 {
241         struct net_device *dev = idev->dev;
242 
243         WARN_ON(!list_empty(&idev->addr_list));
244         WARN_ON(idev->mc_list);
245         WARN_ON(timer_pending(&idev->rs_timer));
246 
247 #ifdef NET_REFCNT_DEBUG
248         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
249 #endif
250         dev_put(dev);
251         if (!idev->dead) {
252                 pr_warn("Freeing alive inet6 device %p\n", idev);
253                 return;
254         }
255         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
256 }
257 EXPORT_SYMBOL(in6_dev_finish_destroy);
258 

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