[linux.git] / net / ipv6 / addrconf_core.c

/*
 * IPv6 library code, needed by static components when full IPv6 support is
 * not configured or static.
 */

#include <linux/export.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/ip.h>

/* if ipv6 module registers this function is used by xfrm to force all
 * sockets to relookup their nodes - this is fairly expensive, be
 * careful
 */
void (*__fib6_flush_trees)(struct net *);
EXPORT_SYMBOL(__fib6_flush_trees);

#define IPV6_ADDR_SCOPE_TYPE(scope)	((scope) << 16)

static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
{
	switch (scope) {
	case IPV6_ADDR_SCOPE_NODELOCAL:
		return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
			IPV6_ADDR_LOOPBACK);
	case IPV6_ADDR_SCOPE_LINKLOCAL:
		return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
			IPV6_ADDR_LINKLOCAL);
	case IPV6_ADDR_SCOPE_SITELOCAL:
		return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
			IPV6_ADDR_SITELOCAL);
	}
	return IPV6_ADDR_SCOPE_TYPE(scope);
}

int __ipv6_addr_type(const struct in6_addr *addr)
{
	__be32 st;

	st = addr->s6_addr32[0];

	/* Consider all addresses with the first three bits different of
	   000 and 111 as unicasts.
	 */
	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
	    (st & htonl(0xE0000000)) != htonl(0xE0000000))
		return (IPV6_ADDR_UNICAST |
			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));

	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
		/* multicast */
		/* addr-select 3.1 */
		return (IPV6_ADDR_MULTICAST |
			ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
	}

	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
		return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));		/* addr-select 3.1 */
	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
		return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));		/* addr-select 3.1 */
	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
		return (IPV6_ADDR_UNICAST |
			IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));			/* RFC 4193 */

	if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
		if (addr->s6_addr32[2] == 0) {
			if (addr->s6_addr32[3] == 0)
				return IPV6_ADDR_ANY;

			if (addr->s6_addr32[3] == htonl(0x00000001))
				return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
					IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));	/* addr-select 3.4 */

			return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
				IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.3 */
		}

		if (addr->s6_addr32[2] == htonl(0x0000ffff))
			return (IPV6_ADDR_MAPPED |
				IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.3 */
	}

	return (IPV6_ADDR_UNICAST |
		IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.4 */
}
EXPORT_SYMBOL(__ipv6_addr_type);

static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);

int register_inet6addr_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&inet6addr_chain, nb);
}
EXPORT_SYMBOL(register_inet6addr_notifier);

int unregister_inet6addr_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
}
EXPORT_SYMBOL(unregister_inet6addr_notifier);

int inet6addr_notifier_call_chain(unsigned long val, void *v)
{
	return atomic_notifier_call_chain(&inet6addr_chain, val, v);
}
EXPORT_SYMBOL(inet6addr_notifier_call_chain);

int register_inet6addr_validator_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
}
EXPORT_SYMBOL(register_inet6addr_validator_notifier);

int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
						  nb);
}
EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);

int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
{
	return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
}
EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);

static int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1,
					struct dst_entry **u2,
					struct flowi6 *u3)
{
	return -EAFNOSUPPORT;
}

const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
	.ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
};
EXPORT_SYMBOL_GPL(ipv6_stub);

/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
EXPORT_SYMBOL(in6addr_loopback);
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
EXPORT_SYMBOL(in6addr_any);
const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
EXPORT_SYMBOL(in6addr_linklocal_allnodes);
const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
EXPORT_SYMBOL(in6addr_linklocal_allrouters);
const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
EXPORT_SYMBOL(in6addr_sitelocal_allrouters);

static void snmp6_free_dev(struct inet6_dev *idev)
{
	kfree(idev->stats.icmpv6msgdev);
	kfree(idev->stats.icmpv6dev);
	free_percpu(idev->stats.ipv6);
}

static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
{
	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);

	snmp6_free_dev(idev);
	kfree(idev);
}

/* Nobody refers to this device, we may destroy it. */

void in6_dev_finish_destroy(struct inet6_dev *idev)
{
	struct net_device *dev = idev->dev;

	WARN_ON(!list_empty(&idev->addr_list));
	WARN_ON(idev->mc_list);
	WARN_ON(timer_pending(&idev->rs_timer));

#ifdef NET_REFCNT_DEBUG
	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
#endif
	dev_put(dev);
	if (!idev->dead) {
		pr_warn("Freeing alive inet6 device %p\n", idev);
		return;
	}
	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
}
EXPORT_SYMBOL(in6_dev_finish_destroy);
Commit	Line	Data
8c14b7ce YH	1	/*
	2	* IPv6 library code, needed by static components when full IPv6 support is
	3	* not configured or static.
	4	*/
	5
bc3b2d7f	6	#include <linux/export.h>
8c14b7ce	7	#include <net/ipv6.h>
6da334ee	8	#include <net/addrconf.h>
f39dc102	9	#include <net/ip.h>
8c14b7ce	10
705f1c86 HFS	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
8c14b7ce YH	18	#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
8c14b7ce YH	19
95c96174	20	static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
8c14b7ce	21	{
d94d34a0	22	switch (scope) {
8c14b7ce YH	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
	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 */
c61a7d10 DJ	63	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
	64	return (IPV6_ADDR_UNICAST \|
	65	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
8c14b7ce YH	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
45bb0060	85	return (IPV6_ADDR_UNICAST \|
8c14b7ce YH	86	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
8c14b7ce YH	87	}
7401055b	88	EXPORT_SYMBOL(__ipv6_addr_type);
8c14b7ce	89
f88c91dd	90	static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
ff7883ea	91	static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);
f88c91dd CW	92
	93	int register_inet6addr_notifier(struct notifier_block *nb)
	94	{
	95	return atomic_notifier_chain_register(&inet6addr_chain, nb);
	96	}
	97	EXPORT_SYMBOL(register_inet6addr_notifier);
	98
	99	int unregister_inet6addr_notifier(struct notifier_block *nb)
	100	{
	101	return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
	102	}
	103	EXPORT_SYMBOL(unregister_inet6addr_notifier);
	104
	105	int inet6addr_notifier_call_chain(unsigned long val, void *v)
	106	{
	107	return atomic_notifier_call_chain(&inet6addr_chain, val, v);
	108	}
	109	EXPORT_SYMBOL(inet6addr_notifier_call_chain);
5f81bd2e	110
3ad7d246 KJ	111	int register_inet6addr_validator_notifier(struct notifier_block *nb)
3ad7d246 KJ	112	{
ff7883ea	113	return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
3ad7d246 KJ	114	}
	115	EXPORT_SYMBOL(register_inet6addr_validator_notifier);
	116
	117	int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
	118	{
ff7883ea DA	119	return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
ff7883ea DA	120	nb);
3ad7d246 KJ	121	}
	122	EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);
	123
	124	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
	125	{
ff7883ea	126	return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
3ad7d246 KJ	127	}
	128	EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);
	129
343d60aa RP	130	static int eafnosupport_ipv6_dst_lookup(struct net net, struct sock u1,
	131	struct dst_entry **u2,
	132	struct flowi6 *u3)
	133	{
	134	return -EAFNOSUPPORT;
	135	}
	136
	137	const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
	138	.ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
	139	};
5f81bd2e	140	EXPORT_SYMBOL_GPL(ipv6_stub);
034dfc5d CW	141
	142	/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
	143	const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
	144	EXPORT_SYMBOL(in6addr_loopback);
	145	const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
	146	EXPORT_SYMBOL(in6addr_any);
	147	const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
	148	EXPORT_SYMBOL(in6addr_linklocal_allnodes);
	149	const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
	150	EXPORT_SYMBOL(in6addr_linklocal_allrouters);
	151	const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
	152	EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
	153	const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
	154	EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
	155	const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
	156	EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
f39dc102 CW	157
	158	static void snmp6_free_dev(struct inet6_dev *idev)
	159	{
	160	kfree(idev->stats.icmpv6msgdev);
	161	kfree(idev->stats.icmpv6dev);
698365fa	162	free_percpu(idev->stats.ipv6);
f39dc102 CW	163	}
f39dc102 CW	164
27e41fcf RS	165	static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
	166	{
	167	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
	168
	169	snmp6_free_dev(idev);
	170	kfree(idev);
	171	}
	172
f39dc102 CW	173	/* Nobody refers to this device, we may destroy it. */
	174
	175	void in6_dev_finish_destroy(struct inet6_dev *idev)
	176	{
	177	struct net_device *dev = idev->dev;
	178
	179	WARN_ON(!list_empty(&idev->addr_list));
53b24b8f	180	WARN_ON(idev->mc_list);
f39dc102 CW	181	WARN_ON(timer_pending(&idev->rs_timer));
	182
	183	#ifdef NET_REFCNT_DEBUG
	184	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
	185	#endif
	186	dev_put(dev);
	187	if (!idev->dead) {
	188	pr_warn("Freeing alive inet6 device %p\n", idev);
	189	return;
	190	}
27e41fcf	191	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
f39dc102 CW	192	}
f39dc102 CW	193	EXPORT_SYMBOL(in6_dev_finish_destroy);