[linux-block.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/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 struct dst_entry *eafnosupport_ipv6_dst_lookup_flow(struct net *net,
							   const struct sock *sk,
							   struct flowi6 *fl6,
							   const struct in6_addr *final_dst)
{
	return ERR_PTR(-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;
}

static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt,
				   bool skip_notify)
{
	return -EAFNOSUPPORT;
}

static int eafnosupport_ipv6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
				      int (*output)(struct net *, struct sock *, struct sk_buff *))
{
	kfree_skb(skb);
	return -EAFNOSUPPORT;
}

static struct net_device *eafnosupport_ipv6_dev_find(struct net *net, const struct in6_addr *addr,
						     struct net_device *dev)
{
	return ERR_PTR(-EAFNOSUPPORT);
}

const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
	.ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow,
	.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,
	.ip6_del_rt	   = eafnosupport_ip6_del_rt,
	.ipv6_fragment	   = eafnosupport_ipv6_fragment,
	.ipv6_dev_find     = eafnosupport_ipv6_dev_find,
};
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(rcu_access_pointer(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>
6c5d9c2a	10	#include <net/addrconf.h>
f39dc102	11	#include <net/ip.h>
8c14b7ce	12
705f1c86 HFS	13	/* if ipv6 module registers this function is used by xfrm to force all
	14	* sockets to relookup their nodes - this is fairly expensive, be
	15	* careful
	16	*/
	17	void (__fib6_flush_trees)(struct net );
	18	EXPORT_SYMBOL(__fib6_flush_trees);
	19
8c14b7ce YH	20	#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
8c14b7ce YH	21
95c96174	22	static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
8c14b7ce	23	{
d94d34a0	24	switch (scope) {
8c14b7ce YH	25	case IPV6_ADDR_SCOPE_NODELOCAL:
	26	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) \|
	27	IPV6_ADDR_LOOPBACK);
	28	case IPV6_ADDR_SCOPE_LINKLOCAL:
	29	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) \|
	30	IPV6_ADDR_LINKLOCAL);
	31	case IPV6_ADDR_SCOPE_SITELOCAL:
	32	return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) \|
	33	IPV6_ADDR_SITELOCAL);
	34	}
	35	return IPV6_ADDR_SCOPE_TYPE(scope);
	36	}
	37
	38	int __ipv6_addr_type(const struct in6_addr *addr)
	39	{
	40	__be32 st;
	41
	42	st = addr->s6_addr32[0];
	43
	44	/* Consider all addresses with the first three bits different of
	45	000 and 111 as unicasts.
	46	*/
	47	if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
	48	(st & htonl(0xE0000000)) != htonl(0xE0000000))
	49	return (IPV6_ADDR_UNICAST \|
	50	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
	51
	52	if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
	53	/* multicast */
	54	/* addr-select 3.1 */
	55	return (IPV6_ADDR_MULTICAST \|
	56	ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
	57	}
	58
	59	if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
	60	return (IPV6_ADDR_LINKLOCAL \| IPV6_ADDR_UNICAST \|
	61	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
	62	if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
	63	return (IPV6_ADDR_SITELOCAL \| IPV6_ADDR_UNICAST \|
	64	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
c61a7d10 DJ	65	if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
	66	return (IPV6_ADDR_UNICAST \|
	67	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
8c14b7ce YH	68
	69	if ((addr->s6_addr32[0] \| addr->s6_addr32[1]) == 0) {
	70	if (addr->s6_addr32[2] == 0) {
	71	if (addr->s6_addr32[3] == 0)
	72	return IPV6_ADDR_ANY;
	73
	74	if (addr->s6_addr32[3] == htonl(0x00000001))
	75	return (IPV6_ADDR_LOOPBACK \| IPV6_ADDR_UNICAST \|
	76	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
	77
	78	return (IPV6_ADDR_COMPATv4 \| IPV6_ADDR_UNICAST \|
	79	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	80	}
	81
	82	if (addr->s6_addr32[2] == htonl(0x0000ffff))
	83	return (IPV6_ADDR_MAPPED \|
	84	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
	85	}
	86
45bb0060	87	return (IPV6_ADDR_UNICAST \|
8c14b7ce YH	88	IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
8c14b7ce YH	89	}
7401055b	90	EXPORT_SYMBOL(__ipv6_addr_type);
8c14b7ce	91
f88c91dd	92	static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
ff7883ea	93	static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);
f88c91dd CW	94
	95	int register_inet6addr_notifier(struct notifier_block *nb)
	96	{
	97	return atomic_notifier_chain_register(&inet6addr_chain, nb);
	98	}
	99	EXPORT_SYMBOL(register_inet6addr_notifier);
	100
	101	int unregister_inet6addr_notifier(struct notifier_block *nb)
	102	{
	103	return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
	104	}
	105	EXPORT_SYMBOL(unregister_inet6addr_notifier);
	106
	107	int inet6addr_notifier_call_chain(unsigned long val, void *v)
	108	{
	109	return atomic_notifier_call_chain(&inet6addr_chain, val, v);
	110	}
	111	EXPORT_SYMBOL(inet6addr_notifier_call_chain);
5f81bd2e	112
3ad7d246 KJ	113	int register_inet6addr_validator_notifier(struct notifier_block *nb)
3ad7d246 KJ	114	{
ff7883ea	115	return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
3ad7d246 KJ	116	}
	117	EXPORT_SYMBOL(register_inet6addr_validator_notifier);
	118
	119	int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
	120	{
ff7883ea DA	121	return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
ff7883ea DA	122	nb);
3ad7d246 KJ	123	}
	124	EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);
	125
	126	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
	127	{
ff7883ea	128	return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
3ad7d246 KJ	129	}
	130	EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);
	131
6c8991f4 SD	132	static struct dst_entry eafnosupport_ipv6_dst_lookup_flow(struct net net,
	133	const struct sock *sk,
	134	struct flowi6 *fl6,
	135	const struct in6_addr *final_dst)
343d60aa	136	{
6c8991f4	137	return ERR_PTR(-EAFNOSUPPORT);
343d60aa RP	138	}
343d60aa RP	139
9b0a6a9d PO	140	static int eafnosupport_ipv6_route_input(struct sk_buff *skb)
	141	{
	142	return -EAFNOSUPPORT;
	143	}
	144
65a2022e DA	145	static struct fib6_table eafnosupport_fib6_get_table(struct net net, u32 id)
	146	{
	147	return NULL;
	148	}
	149
effda4dd	150	static int
65a2022e	151	eafnosupport_fib6_table_lookup(struct net net, struct fib6_table table,
effda4dd DA	152	int oif, struct flowi6 *fl6,
effda4dd DA	153	struct fib6_result *res, int flags)
65a2022e	154	{
effda4dd	155	return -EAFNOSUPPORT;
65a2022e DA	156	}
65a2022e DA	157
effda4dd	158	static int
65a2022e	159	eafnosupport_fib6_lookup(struct net net, int oif, struct flowi6 fl6,
effda4dd	160	struct fib6_result *res, int flags)
65a2022e	161	{
effda4dd	162	return -EAFNOSUPPORT;
65a2022e DA	163	}
65a2022e DA	164
b1d40991 DA	165	static void
	166	eafnosupport_fib6_select_path(const struct net net, struct fib6_result res,
	167	struct flowi6 *fl6, int oif, bool have_oif_match,
	168	const struct sk_buff *skb, int strict)
65a2022e	169	{
65a2022e DA	170	}
65a2022e DA	171
901731b8	172	static u32
b748f260 DA	173	eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res,
	174	const struct in6_addr *daddr,
	175	const struct in6_addr *saddr)
901731b8 DA	176	{
	177	return 0;
	178	}
	179
1aefd3de DA	180	static int eafnosupport_fib6_nh_init(struct net net, struct fib6_nh fib6_nh,
	181	struct fib6_config *cfg, gfp_t gfp_flags,
	182	struct netlink_ext_ack *extack)
	183	{
	184	NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
	185	return -EAFNOSUPPORT;
	186	}
	187
11dd74b3 RP	188	static int eafnosupport_ip6_del_rt(struct net net, struct fib6_info rt,
11dd74b3 RP	189	bool skip_notify)
68a9b13d DA	190	{
	191	return -EAFNOSUPPORT;
	192	}
	193
1d97898b	194	static int eafnosupport_ipv6_fragment(struct net net, struct sock sk, struct sk_buff *skb,
	195	int (output)(struct net , struct sock , struct sk_buff ))
	196	{
	197	kfree_skb(skb);
	198	return -EAFNOSUPPORT;
	199	}
	200
504a4011 AR	201	static struct net_device eafnosupport_ipv6_dev_find(struct net net, const struct in6_addr *addr,
	202	struct net_device *dev)
	203	{
	204	return ERR_PTR(-EAFNOSUPPORT);
	205	}
	206
343d60aa	207	const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
6c8991f4	208	.ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow,
9b0a6a9d	209	.ipv6_route_input = eafnosupport_ipv6_route_input,
65a2022e DA	210	.fib6_get_table = eafnosupport_fib6_get_table,
	211	.fib6_table_lookup = eafnosupport_fib6_table_lookup,
	212	.fib6_lookup = eafnosupport_fib6_lookup,
b1d40991	213	.fib6_select_path = eafnosupport_fib6_select_path,
901731b8	214	.ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
1aefd3de	215	.fib6_nh_init = eafnosupport_fib6_nh_init,
68a9b13d	216	.ip6_del_rt = eafnosupport_ip6_del_rt,
1d97898b	217	.ipv6_fragment = eafnosupport_ipv6_fragment,
504a4011	218	.ipv6_dev_find = eafnosupport_ipv6_dev_find,
343d60aa	219	};
5f81bd2e	220	EXPORT_SYMBOL_GPL(ipv6_stub);
034dfc5d CW	221
	222	/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
	223	const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
	224	EXPORT_SYMBOL(in6addr_loopback);
	225	const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
	226	EXPORT_SYMBOL(in6addr_any);
	227	const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
	228	EXPORT_SYMBOL(in6addr_linklocal_allnodes);
	229	const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
	230	EXPORT_SYMBOL(in6addr_linklocal_allrouters);
	231	const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
	232	EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
	233	const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
	234	EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
	235	const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
	236	EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
f39dc102 CW	237
	238	static void snmp6_free_dev(struct inet6_dev *idev)
	239	{
	240	kfree(idev->stats.icmpv6msgdev);
	241	kfree(idev->stats.icmpv6dev);
698365fa	242	free_percpu(idev->stats.ipv6);
f39dc102 CW	243	}
f39dc102 CW	244
27e41fcf RS	245	static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
	246	{
	247	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
	248
	249	snmp6_free_dev(idev);
	250	kfree(idev);
	251	}
	252
f39dc102 CW	253	/* Nobody refers to this device, we may destroy it. */
	254
	255	void in6_dev_finish_destroy(struct inet6_dev *idev)
	256	{
	257	struct net_device *dev = idev->dev;
	258
	259	WARN_ON(!list_empty(&idev->addr_list));
88e2ca30	260	WARN_ON(rcu_access_pointer(idev->mc_list));
f39dc102 CW	261	WARN_ON(timer_pending(&idev->rs_timer));
	262
	263	#ifdef NET_REFCNT_DEBUG
	264	pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
	265	#endif
	266	dev_put(dev);
	267	if (!idev->dead) {
	268	pr_warn("Freeing alive inet6 device %p\n", idev);
	269	return;
	270	}
27e41fcf	271	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
f39dc102 CW	272	}
f39dc102 CW	273	EXPORT_SYMBOL(in6_dev_finish_destroy);