[mirror_ubuntu-zesty-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>

#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);
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>
8c14b7ce YH	9
	10	#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
	11
95c96174	12	static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
8c14b7ce	13	{
d94d34a0	14	switch (scope) {
8c14b7ce YH	15	case IPV6_ADDR_SCOPE_NODELOCAL:
	16	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) \|
	17	IPV6_ADDR_LOOPBACK);
	18	case IPV6_ADDR_SCOPE_LINKLOCAL:
	19	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) \|
	20	IPV6_ADDR_LINKLOCAL);
	21	case IPV6_ADDR_SCOPE_SITELOCAL:
	22	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) \|
	23	IPV6_ADDR_SITELOCAL);
	24	}
	25	return IPV6_ADDR_SCOPE_TYPE(scope);
	26	}
	27
	28	int __ipv6_addr_type(const struct in6_addr *addr)
	29	{
	30	__be32 st;
	31
	32	st = addr->s6_addr32[0];
	33
	34	/* Consider all addresses with the first three bits different of
	35	000 and 111 as unicasts.
	36	*/
	37	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
	38	(st & htonl(0xE0000000)) != htonl(0xE0000000))
	39	return (IPV6_ADDR_UNICAST \|
	40	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
	41
	42	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
	43	/* multicast */
	44	/* addr-select 3.1 */
	45	return (IPV6_ADDR_MULTICAST \|
	46	ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
	47	}
	48
	49	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
	50	return (IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_UNICAST \|
	51	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
	52	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
	53	return (IPV6_ADDR_SITELOCAL \| IPV6_ADDR_UNICAST \|
	54	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
c61a7d10 DJ	55	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
	56	return (IPV6_ADDR_UNICAST \|
	57	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
8c14b7ce YH	58
	59	if ((addr->s6_addr32[0] \| addr->s6_addr32[1]) == 0) {
	60	if (addr->s6_addr32[2] == 0) {
	61	if (addr->s6_addr32[3] == 0)
	62	return IPV6_ADDR_ANY;
	63
	64	if (addr->s6_addr32[3] == htonl(0x00000001))
	65	return (IPV6_ADDR_LOOPBACK \| IPV6_ADDR_UNICAST \|
	66	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
	67
	68	return (IPV6_ADDR_COMPATv4 \| IPV6_ADDR_UNICAST \|
	69	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	70	}
	71
	72	if (addr->s6_addr32[2] == htonl(0x0000ffff))
	73	return (IPV6_ADDR_MAPPED \|
	74	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	75	}
	76
45bb0060	77	return (IPV6_ADDR_UNICAST \|
8c14b7ce YH	78	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
8c14b7ce YH	79	}
7401055b	80	EXPORT_SYMBOL(__ipv6_addr_type);
8c14b7ce	81
f88c91dd CW	82	static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
	83
	84	int register_inet6addr_notifier(struct notifier_block *nb)
	85	{
	86	return atomic_notifier_chain_register(&inet6addr_chain, nb);
	87	}
	88	EXPORT_SYMBOL(register_inet6addr_notifier);
	89
	90	int unregister_inet6addr_notifier(struct notifier_block *nb)
	91	{
	92	return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
	93	}
	94	EXPORT_SYMBOL(unregister_inet6addr_notifier);
	95
	96	int inet6addr_notifier_call_chain(unsigned long val, void *v)
	97	{
	98	return atomic_notifier_call_chain(&inet6addr_chain, val, v);
	99	}
	100	EXPORT_SYMBOL(inet6addr_notifier_call_chain);
5f81bd2e CW	101
	102	const struct ipv6_stub *ipv6_stub __read_mostly;
	103	EXPORT_SYMBOL_GPL(ipv6_stub);
034dfc5d CW	104
	105	/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
	106	const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
	107	EXPORT_SYMBOL(in6addr_loopback);
	108	const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
	109	EXPORT_SYMBOL(in6addr_any);
	110	const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
	111	EXPORT_SYMBOL(in6addr_linklocal_allnodes);
	112	const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
	113	EXPORT_SYMBOL(in6addr_linklocal_allrouters);
	114	const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
	115	EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
	116	const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
	117	EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
	118	const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
	119	EXPORT_SYMBOL(in6addr_sitelocal_allrouters);