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
ipv6_addr_scope2type(unsigned int scope)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
__ipv6_addr_type(const struct in6_addr * addr)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
register_inet6addr_notifier(struct notifier_block * nb)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
unregister_inet6addr_notifier(struct notifier_block * nb)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
inet6addr_notifier_call_chain(unsigned long val,void * v)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 const struct ipv6_stub *ipv6_stub __read_mostly;
111 EXPORT_SYMBOL_GPL(ipv6_stub);
112
113 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
114 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
115 EXPORT_SYMBOL(in6addr_loopback);
116 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
117 EXPORT_SYMBOL(in6addr_any);
118 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
119 EXPORT_SYMBOL(in6addr_linklocal_allnodes);
120 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
121 EXPORT_SYMBOL(in6addr_linklocal_allrouters);
122 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
123 EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
124 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
125 EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
126 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
127 EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
128
snmp6_free_dev(struct inet6_dev * idev)129 static void snmp6_free_dev(struct inet6_dev *idev)
130 {
131 kfree(idev->stats.icmpv6msgdev);
132 kfree(idev->stats.icmpv6dev);
133 free_percpu(idev->stats.ipv6);
134 }
135
136 /* Nobody refers to this device, we may destroy it. */
137
in6_dev_finish_destroy(struct inet6_dev * idev)138 void in6_dev_finish_destroy(struct inet6_dev *idev)
139 {
140 struct net_device *dev = idev->dev;
141
142 WARN_ON(!list_empty(&idev->addr_list));
143 WARN_ON(idev->mc_list != NULL);
144 WARN_ON(timer_pending(&idev->rs_timer));
145
146 #ifdef NET_REFCNT_DEBUG
147 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
148 #endif
149 dev_put(dev);
150 if (!idev->dead) {
151 pr_warn("Freeing alive inet6 device %p\n", idev);
152 return;
153 }
154 snmp6_free_dev(idev);
155 kfree_rcu(idev, rcu);
156 }
157 EXPORT_SYMBOL(in6_dev_finish_destroy);
158