[thirdparty/kernel/stable.git] / net / ipv6 / addrconf_core.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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/ipv6_stubs.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;
}

static int eafnosupport_ipv6_route_input(struct sk_buff *skb)
{
	return -EAFNOSUPPORT;
}

static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id)
{
	return NULL;
}

static int
eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table,
			       int oif, struct flowi6 *fl6,
			       struct fib6_result *res, int flags)
{
	return -EAFNOSUPPORT;
}

static int
eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
			 struct fib6_result *res, int flags)
{
	return -EAFNOSUPPORT;
}

static void
eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res,
			      struct flowi6 *fl6, int oif, bool have_oif_match,
			      const struct sk_buff *skb, int strict)
{
}

static u32
eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res,
			       const struct in6_addr *daddr,
			       const struct in6_addr *saddr)
{
	return 0;
}

static int eafnosupport_fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
				     struct fib6_config *cfg, gfp_t gfp_flags,
				     struct netlink_ext_ack *extack)
{
	NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
	return -EAFNOSUPPORT;
}

const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
	.ipv6_dst_lookup   = eafnosupport_ipv6_dst_lookup,
	.ipv6_route_input  = eafnosupport_ipv6_route_input,
	.fib6_get_table    = eafnosupport_fib6_get_table,
	.fib6_table_lookup = eafnosupport_fib6_table_lookup,
	.fib6_lookup       = eafnosupport_fib6_lookup,
	.fib6_select_path  = eafnosupport_fib6_select_path,
	.ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
	.fib6_nh_init	   = eafnosupport_fib6_nh_init,
};
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
457c8996	1	// SPDX-License-Identifier: GPL-2.0-only
8c14b7ce YH	2	/*
	3	* IPv6 library code, needed by static components when full IPv6 support is
	4	* not configured or static.
	5	*/
	6
bc3b2d7f	7	#include <linux/export.h>
8c14b7ce	8	#include <net/ipv6.h>
3616d08b	9	#include <net/ipv6_stubs.h>
f39dc102	10	#include <net/ip.h>
8c14b7ce	11
705f1c86 HFS	12	/* if ipv6 module registers this function is used by xfrm to force all
	13	* sockets to relookup their nodes - this is fairly expensive, be
	14	* careful
	15	*/
	16	void (__fib6_flush_trees)(struct net );
	17	EXPORT_SYMBOL(__fib6_flush_trees);
	18
8c14b7ce YH	19	#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
8c14b7ce YH	20
95c96174	21	static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
8c14b7ce	22	{
d94d34a0	23	switch (scope) {
8c14b7ce YH	24	case IPV6_ADDR_SCOPE_NODELOCAL:
	25	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) \|
	26	IPV6_ADDR_LOOPBACK);
	27	case IPV6_ADDR_SCOPE_LINKLOCAL:
	28	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) \|
	29	IPV6_ADDR_LINKLOCAL);
	30	case IPV6_ADDR_SCOPE_SITELOCAL:
	31	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) \|
	32	IPV6_ADDR_SITELOCAL);
	33	}
	34	return IPV6_ADDR_SCOPE_TYPE(scope);
	35	}
	36
	37	int __ipv6_addr_type(const struct in6_addr *addr)
	38	{
	39	__be32 st;
	40
	41	st = addr->s6_addr32[0];
	42
	43	/* Consider all addresses with the first three bits different of
	44	000 and 111 as unicasts.
	45	*/
	46	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
	47	(st & htonl(0xE0000000)) != htonl(0xE0000000))
	48	return (IPV6_ADDR_UNICAST \|
	49	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
	50
	51	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
	52	/* multicast */
	53	/* addr-select 3.1 */
	54	return (IPV6_ADDR_MULTICAST \|
	55	ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
	56	}
	57
	58	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
	59	return (IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_UNICAST \|
	60	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
	61	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
	62	return (IPV6_ADDR_SITELOCAL \| IPV6_ADDR_UNICAST \|
	63	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
c61a7d10 DJ	64	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
	65	return (IPV6_ADDR_UNICAST \|
	66	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
8c14b7ce YH	67
	68	if ((addr->s6_addr32[0] \| addr->s6_addr32[1]) == 0) {
	69	if (addr->s6_addr32[2] == 0) {
	70	if (addr->s6_addr32[3] == 0)
	71	return IPV6_ADDR_ANY;
	72
	73	if (addr->s6_addr32[3] == htonl(0x00000001))
	74	return (IPV6_ADDR_LOOPBACK \| IPV6_ADDR_UNICAST \|
	75	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
	76
	77	return (IPV6_ADDR_COMPATv4 \| IPV6_ADDR_UNICAST \|
	78	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	79	}
	80
	81	if (addr->s6_addr32[2] == htonl(0x0000ffff))
	82	return (IPV6_ADDR_MAPPED \|
	83	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	84	}
	85
45bb0060	86	return (IPV6_ADDR_UNICAST \|
8c14b7ce YH	87	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
8c14b7ce YH	88	}
7401055b	89	EXPORT_SYMBOL(__ipv6_addr_type);
8c14b7ce	90
f88c91dd	91	static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
ff7883ea	92	static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);
f88c91dd CW	93
	94	int register_inet6addr_notifier(struct notifier_block *nb)
	95	{
	96	return atomic_notifier_chain_register(&inet6addr_chain, nb);
	97	}
	98	EXPORT_SYMBOL(register_inet6addr_notifier);
	99
	100	int unregister_inet6addr_notifier(struct notifier_block *nb)
	101	{
	102	return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
	103	}
	104	EXPORT_SYMBOL(unregister_inet6addr_notifier);
	105
	106	int inet6addr_notifier_call_chain(unsigned long val, void *v)
	107	{
	108	return atomic_notifier_call_chain(&inet6addr_chain, val, v);
	109	}
	110	EXPORT_SYMBOL(inet6addr_notifier_call_chain);
5f81bd2e	111
3ad7d246 KJ	112	int register_inet6addr_validator_notifier(struct notifier_block *nb)
3ad7d246 KJ	113	{
ff7883ea	114	return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
3ad7d246 KJ	115	}
	116	EXPORT_SYMBOL(register_inet6addr_validator_notifier);
	117
	118	int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
	119	{
ff7883ea DA	120	return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
ff7883ea DA	121	nb);
3ad7d246 KJ	122	}
	123	EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);
	124
	125	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
	126	{
ff7883ea	127	return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
3ad7d246 KJ	128	}
	129	EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);
	130
343d60aa RP	131	static int eafnosupport_ipv6_dst_lookup(struct net net, struct sock u1,
	132	struct dst_entry **u2,
	133	struct flowi6 *u3)
	134	{
	135	return -EAFNOSUPPORT;
	136	}
	137
9b0a6a9d PO	138	static int eafnosupport_ipv6_route_input(struct sk_buff *skb)
	139	{
	140	return -EAFNOSUPPORT;
	141	}
	142
65a2022e DA	143	static struct fib6_table eafnosupport_fib6_get_table(struct net net, u32 id)
	144	{
	145	return NULL;
	146	}
	147
effda4dd	148	static int
65a2022e	149	eafnosupport_fib6_table_lookup(struct net net, struct fib6_table table,
effda4dd DA	150	int oif, struct flowi6 *fl6,
effda4dd DA	151	struct fib6_result *res, int flags)
65a2022e	152	{
effda4dd	153	return -EAFNOSUPPORT;
65a2022e DA	154	}
65a2022e DA	155
effda4dd	156	static int
65a2022e	157	eafnosupport_fib6_lookup(struct net net, int oif, struct flowi6 fl6,
effda4dd	158	struct fib6_result *res, int flags)
65a2022e	159	{
effda4dd	160	return -EAFNOSUPPORT;
65a2022e DA	161	}
65a2022e DA	162
b1d40991 DA	163	static void
	164	eafnosupport_fib6_select_path(const struct net net, struct fib6_result res,
	165	struct flowi6 *fl6, int oif, bool have_oif_match,
	166	const struct sk_buff *skb, int strict)
65a2022e	167	{
65a2022e DA	168	}
65a2022e DA	169
901731b8	170	static u32
b748f260 DA	171	eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res,
	172	const struct in6_addr *daddr,
	173	const struct in6_addr *saddr)
901731b8 DA	174	{
	175	return 0;
	176	}
	177
1aefd3de DA	178	static int eafnosupport_fib6_nh_init(struct net net, struct fib6_nh fib6_nh,
	179	struct fib6_config *cfg, gfp_t gfp_flags,
	180	struct netlink_ext_ack *extack)
	181	{
	182	NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
	183	return -EAFNOSUPPORT;
	184	}
	185
343d60aa	186	const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
65a2022e	187	.ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
9b0a6a9d	188	.ipv6_route_input = eafnosupport_ipv6_route_input,
65a2022e DA	189	.fib6_get_table = eafnosupport_fib6_get_table,
	190	.fib6_table_lookup = eafnosupport_fib6_table_lookup,
	191	.fib6_lookup = eafnosupport_fib6_lookup,
b1d40991	192	.fib6_select_path = eafnosupport_fib6_select_path,
901731b8	193	.ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
1aefd3de	194	.fib6_nh_init = eafnosupport_fib6_nh_init,
343d60aa	195	};
5f81bd2e	196	EXPORT_SYMBOL_GPL(ipv6_stub);
034dfc5d CW	197
	198	/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
	199	const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
	200	EXPORT_SYMBOL(in6addr_loopback);
	201	const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
	202	EXPORT_SYMBOL(in6addr_any);
	203	const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
	204	EXPORT_SYMBOL(in6addr_linklocal_allnodes);
	205	const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
	206	EXPORT_SYMBOL(in6addr_linklocal_allrouters);
	207	const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
	208	EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
	209	const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
	210	EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
	211	const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
	212	EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
f39dc102 CW	213
	214	static void snmp6_free_dev(struct inet6_dev *idev)
	215	{
	216	kfree(idev->stats.icmpv6msgdev);
	217	kfree(idev->stats.icmpv6dev);
698365fa	218	free_percpu(idev->stats.ipv6);
f39dc102 CW	219	}
f39dc102 CW	220
27e41fcf RS	221	static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
	222	{
	223	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
	224
	225	snmp6_free_dev(idev);
	226	kfree(idev);
	227	}
	228
f39dc102 CW	229	/* Nobody refers to this device, we may destroy it. */
	230
	231	void in6_dev_finish_destroy(struct inet6_dev *idev)
	232	{
	233	struct net_device *dev = idev->dev;
	234
	235	WARN_ON(!list_empty(&idev->addr_list));
53b24b8f	236	WARN_ON(idev->mc_list);
f39dc102 CW	237	WARN_ON(timer_pending(&idev->rs_timer));
	238
	239	#ifdef NET_REFCNT_DEBUG
	240	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
	241	#endif
	242	dev_put(dev);
	243	if (!idev->dead) {
	244	pr_warn("Freeing alive inet6 device %p\n", idev);
	245	return;
	246	}
27e41fcf	247	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
f39dc102 CW	248	}
f39dc102 CW	249	EXPORT_SYMBOL(in6_dev_finish_destroy);