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
110const struct ipv6_stub *ipv6_stub __read_mostly;
111EXPORT_SYMBOL_GPL(ipv6_stub);
112
113/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
114const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
115EXPORT_SYMBOL(in6addr_loopback);
116const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
117EXPORT_SYMBOL(in6addr_any);
118const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
119EXPORT_SYMBOL(in6addr_linklocal_allnodes);
120const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
121EXPORT_SYMBOL(in6addr_linklocal_allrouters);
122const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
123EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
124const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
125EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
126const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
127EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
128
129static 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
136static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
137{
138	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
139
140	snmp6_free_dev(idev);
141	kfree(idev);
142}
143
144/* Nobody refers to this device, we may destroy it. */
145
146void in6_dev_finish_destroy(struct inet6_dev *idev)
147{
148	struct net_device *dev = idev->dev;
149
150	WARN_ON(!list_empty(&idev->addr_list));
151	WARN_ON(idev->mc_list);
152	WARN_ON(timer_pending(&idev->rs_timer));
153
154#ifdef NET_REFCNT_DEBUG
155	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
156#endif
157	dev_put(dev);
158	if (!idev->dead) {
159		pr_warn("Freeing alive inet6 device %p\n", idev);
160		return;
161	}
162	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
163}
164EXPORT_SYMBOL(in6_dev_finish_destroy);
165