[mirror_ubuntu-artful-kernel.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>

#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);

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);

const struct ipv6_stub *ipv6_stub __read_mostly;
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);
	snmp_mib_free((void __percpu **)idev->stats.ipv6);
}

/* 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 != NULL);
	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;
	}
	snmp6_free_dev(idev);
	kfree_rcu(idev, 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 YH	10
	11	#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
	12
95c96174	13	static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
8c14b7ce	14	{
d94d34a0	15	switch (scope) {
8c14b7ce YH	16	case IPV6_ADDR_SCOPE_NODELOCAL:
	17	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) \|
	18	IPV6_ADDR_LOOPBACK);
	19	case IPV6_ADDR_SCOPE_LINKLOCAL:
	20	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) \|
	21	IPV6_ADDR_LINKLOCAL);
	22	case IPV6_ADDR_SCOPE_SITELOCAL:
	23	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) \|
	24	IPV6_ADDR_SITELOCAL);
	25	}
	26	return IPV6_ADDR_SCOPE_TYPE(scope);
	27	}
	28
	29	int __ipv6_addr_type(const struct in6_addr *addr)
	30	{
	31	__be32 st;
	32
	33	st = addr->s6_addr32[0];
	34
	35	/* Consider all addresses with the first three bits different of
	36	000 and 111 as unicasts.
	37	*/
	38	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
	39	(st & htonl(0xE0000000)) != htonl(0xE0000000))
	40	return (IPV6_ADDR_UNICAST \|
	41	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
	42
	43	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
	44	/* multicast */
	45	/* addr-select 3.1 */
	46	return (IPV6_ADDR_MULTICAST \|
	47	ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
	48	}
	49
	50	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
	51	return (IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_UNICAST \|
	52	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
	53	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
	54	return (IPV6_ADDR_SITELOCAL \| IPV6_ADDR_UNICAST \|
	55	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
c61a7d10 DJ	56	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
	57	return (IPV6_ADDR_UNICAST \|
	58	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
8c14b7ce YH	59
	60	if ((addr->s6_addr32[0] \| addr->s6_addr32[1]) == 0) {
	61	if (addr->s6_addr32[2] == 0) {
	62	if (addr->s6_addr32[3] == 0)
	63	return IPV6_ADDR_ANY;
	64
	65	if (addr->s6_addr32[3] == htonl(0x00000001))
	66	return (IPV6_ADDR_LOOPBACK \| IPV6_ADDR_UNICAST \|
	67	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
	68
	69	return (IPV6_ADDR_COMPATv4 \| IPV6_ADDR_UNICAST \|
	70	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	71	}
	72
	73	if (addr->s6_addr32[2] == htonl(0x0000ffff))
	74	return (IPV6_ADDR_MAPPED \|
	75	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	76	}
	77
45bb0060	78	return (IPV6_ADDR_UNICAST \|
8c14b7ce YH	79	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
8c14b7ce YH	80	}
7401055b	81	EXPORT_SYMBOL(__ipv6_addr_type);
8c14b7ce	82
f88c91dd CW	83	static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
	84
	85	int register_inet6addr_notifier(struct notifier_block *nb)
	86	{
	87	return atomic_notifier_chain_register(&inet6addr_chain, nb);
	88	}
	89	EXPORT_SYMBOL(register_inet6addr_notifier);
	90
	91	int unregister_inet6addr_notifier(struct notifier_block *nb)
	92	{
	93	return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
	94	}
	95	EXPORT_SYMBOL(unregister_inet6addr_notifier);
	96
	97	int inet6addr_notifier_call_chain(unsigned long val, void *v)
	98	{
	99	return atomic_notifier_call_chain(&inet6addr_chain, val, v);
	100	}
	101	EXPORT_SYMBOL(inet6addr_notifier_call_chain);
5f81bd2e CW	102
	103	const struct ipv6_stub *ipv6_stub __read_mostly;
	104	EXPORT_SYMBOL_GPL(ipv6_stub);
034dfc5d CW	105
	106	/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
	107	const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
	108	EXPORT_SYMBOL(in6addr_loopback);
	109	const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
	110	EXPORT_SYMBOL(in6addr_any);
	111	const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
	112	EXPORT_SYMBOL(in6addr_linklocal_allnodes);
	113	const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
	114	EXPORT_SYMBOL(in6addr_linklocal_allrouters);
	115	const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
	116	EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
	117	const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
	118	EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
	119	const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
	120	EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
f39dc102 CW	121
	122	static void snmp6_free_dev(struct inet6_dev *idev)
	123	{
	124	kfree(idev->stats.icmpv6msgdev);
	125	kfree(idev->stats.icmpv6dev);
	126	snmp_mib_free((void __percpu **)idev->stats.ipv6);
	127	}
	128
	129	/* Nobody refers to this device, we may destroy it. */
	130
	131	void in6_dev_finish_destroy(struct inet6_dev *idev)
	132	{
	133	struct net_device *dev = idev->dev;
	134
	135	WARN_ON(!list_empty(&idev->addr_list));
	136	WARN_ON(idev->mc_list != NULL);
	137	WARN_ON(timer_pending(&idev->rs_timer));
	138
	139	#ifdef NET_REFCNT_DEBUG
	140	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
	141	#endif
	142	dev_put(dev);
	143	if (!idev->dead) {
	144	pr_warn("Freeing alive inet6 device %p\n", idev);
	145	return;
	146	}
	147	snmp6_free_dev(idev);
	148	kfree_rcu(idev, rcu);
	149	}
	150	EXPORT_SYMBOL(in6_dev_finish_destroy);