tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */
15void (*__fib6_flush_trees)(struct net *);
16EXPORT_SYMBOL(__fib6_flush_trees);
17
18#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
19
20static 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
36int __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}
88EXPORT_SYMBOL(__ipv6_addr_type);
89
90static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
91
92int register_inet6addr_notifier(struct notifier_block *nb)
93{
94 return atomic_notifier_chain_register(&inet6addr_chain, nb);
95}
96EXPORT_SYMBOL(register_inet6addr_notifier);
97
98int unregister_inet6addr_notifier(struct notifier_block *nb)
99{
100 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
101}
102EXPORT_SYMBOL(unregister_inet6addr_notifier);
103
104int inet6addr_notifier_call_chain(unsigned long val, void *v)
105{
106 return atomic_notifier_call_chain(&inet6addr_chain, val, v);
107}
108EXPORT_SYMBOL(inet6addr_notifier_call_chain);
109
110static 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
117const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
118 .ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
119};
120EXPORT_SYMBOL_GPL(ipv6_stub);
121
122/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
123const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
124EXPORT_SYMBOL(in6addr_loopback);
125const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
126EXPORT_SYMBOL(in6addr_any);
127const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
128EXPORT_SYMBOL(in6addr_linklocal_allnodes);
129const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
130EXPORT_SYMBOL(in6addr_linklocal_allrouters);
131const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
132EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
133const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
134EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
135const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
136EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
137
138static 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
145static 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
155void 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}
173EXPORT_SYMBOL(in6_dev_finish_destroy);