[linux-2.6-block.git] / net / ipv6 / addrlabel.c

// SPDX-License-Identifier: GPL-2.0
/*
 * IPv6 Address Label subsystem
 * for the IPv6 "Default" Source Address Selection
 *
 * Copyright (C)2007 USAGI/WIDE Project
 */
/*
 * Author:
 *	YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <net/addrconf.h>
#include <linux/if_addrlabel.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>

#if 0
#define ADDRLABEL(x...) printk(x)
#else
#define ADDRLABEL(x...) do { ; } while (0)
#endif

/*
 * Policy Table
 */
struct ip6addrlbl_entry {
	struct in6_addr prefix;
	int prefixlen;
	int ifindex;
	int addrtype;
	u32 label;
	struct hlist_node list;
	struct rcu_head rcu;
};

/*
 * Default policy table (RFC6724 + extensions)
 *
 * prefix		addr_type	label
 * -------------------------------------------------------------------------
 * ::1/128		LOOPBACK	0
 * ::/0			N/A		1
 * 2002::/16		N/A		2
 * ::/96		COMPATv4	3
 * ::ffff:0:0/96	V4MAPPED	4
 * fc00::/7		N/A		5		ULA (RFC 4193)
 * 2001::/32		N/A		6		Teredo (RFC 4380)
 * 2001:10::/28		N/A		7		ORCHID (RFC 4843)
 * fec0::/10		N/A		11		Site-local
 *							(deprecated by RFC3879)
 * 3ffe::/16		N/A		12		6bone
 *
 * Note: 0xffffffff is used if we do not have any policies.
 * Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
 */

#define IPV6_ADDR_LABEL_DEFAULT	0xffffffffUL

static const __net_initconst struct ip6addrlbl_init_table
{
	const struct in6_addr *prefix;
	int prefixlen;
	u32 label;
} ip6addrlbl_init_table[] = {
	{	/* ::/0 */
		.prefix = &in6addr_any,
		.label = 1,
	}, {	/* fc00::/7 */
		.prefix = &(struct in6_addr){ { { 0xfc } } } ,
		.prefixlen = 7,
		.label = 5,
	}, {	/* fec0::/10 */
		.prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
		.prefixlen = 10,
		.label = 11,
	}, {	/* 2002::/16 */
		.prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
		.prefixlen = 16,
		.label = 2,
	}, {	/* 3ffe::/16 */
		.prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
		.prefixlen = 16,
		.label = 12,
	}, {	/* 2001::/32 */
		.prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
		.prefixlen = 32,
		.label = 6,
	}, {	/* 2001:10::/28 */
		.prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
		.prefixlen = 28,
		.label = 7,
	}, {	/* ::ffff:0:0 */
		.prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
		.prefixlen = 96,
		.label = 4,
	}, {	/* ::/96 */
		.prefix = &in6addr_any,
		.prefixlen = 96,
		.label = 3,
	}, {	/* ::1/128 */
		.prefix = &in6addr_loopback,
		.prefixlen = 128,
		.label = 0,
	}
};

/* Find label */
static bool __ip6addrlbl_match(const struct ip6addrlbl_entry *p,
			       const struct in6_addr *addr,
			       int addrtype, int ifindex)
{
	if (p->ifindex && p->ifindex != ifindex)
		return false;
	if (p->addrtype && p->addrtype != addrtype)
		return false;
	if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
		return false;
	return true;
}

static struct ip6addrlbl_entry *__ipv6_addr_label(struct net *net,
						  const struct in6_addr *addr,
						  int type, int ifindex)
{
	struct ip6addrlbl_entry *p;

	hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
		if (__ip6addrlbl_match(p, addr, type, ifindex))
			return p;
	}
	return NULL;
}

u32 ipv6_addr_label(struct net *net,
		    const struct in6_addr *addr, int type, int ifindex)
{
	u32 label;
	struct ip6addrlbl_entry *p;

	type &= IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK;

	rcu_read_lock();
	p = __ipv6_addr_label(net, addr, type, ifindex);
	label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
	rcu_read_unlock();

	ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
		  __func__, addr, type, ifindex, label);

	return label;
}

/* allocate one entry */
static struct ip6addrlbl_entry *ip6addrlbl_alloc(const struct in6_addr *prefix,
						 int prefixlen, int ifindex,
						 u32 label)
{
	struct ip6addrlbl_entry *newp;
	int addrtype;

	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
		  __func__, prefix, prefixlen, ifindex, (unsigned int)label);

	addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED | IPV6_ADDR_COMPATv4 | IPV6_ADDR_LOOPBACK);

	switch (addrtype) {
	case IPV6_ADDR_MAPPED:
		if (prefixlen > 96)
			return ERR_PTR(-EINVAL);
		if (prefixlen < 96)
			addrtype = 0;
		break;
	case IPV6_ADDR_COMPATv4:
		if (prefixlen != 96)
			addrtype = 0;
		break;
	case IPV6_ADDR_LOOPBACK:
		if (prefixlen != 128)
			addrtype = 0;
		break;
	}

	newp = kmalloc(sizeof(*newp), GFP_KERNEL);
	if (!newp)
		return ERR_PTR(-ENOMEM);

	ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
	newp->prefixlen = prefixlen;
	newp->ifindex = ifindex;
	newp->addrtype = addrtype;
	newp->label = label;
	INIT_HLIST_NODE(&newp->list);
	return newp;
}

/* add a label */
static int __ip6addrlbl_add(struct net *net, struct ip6addrlbl_entry *newp,
			    int replace)
{
	struct ip6addrlbl_entry *last = NULL, *p = NULL;
	struct hlist_node *n;
	int ret = 0;

	ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
		  replace);

	hlist_for_each_entry_safe(p, n,	&net->ipv6.ip6addrlbl_table.head, list) {
		if (p->prefixlen == newp->prefixlen &&
		    p->ifindex == newp->ifindex &&
		    ipv6_addr_equal(&p->prefix, &newp->prefix)) {
			if (!replace) {
				ret = -EEXIST;
				goto out;
			}
			hlist_replace_rcu(&p->list, &newp->list);
			kfree_rcu(p, rcu);
			goto out;
		} else if ((p->prefixlen == newp->prefixlen && !p->ifindex) ||
			   (p->prefixlen < newp->prefixlen)) {
			hlist_add_before_rcu(&newp->list, &p->list);
			goto out;
		}
		last = p;
	}
	if (last)
		hlist_add_behind_rcu(&newp->list, &last->list);
	else
		hlist_add_head_rcu(&newp->list, &net->ipv6.ip6addrlbl_table.head);
out:
	if (!ret)
		net->ipv6.ip6addrlbl_table.seq++;
	return ret;
}

/* add a label */
static int ip6addrlbl_add(struct net *net,
			  const struct in6_addr *prefix, int prefixlen,
			  int ifindex, u32 label, int replace)
{
	struct ip6addrlbl_entry *newp;
	int ret = 0;

	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
		  __func__, prefix, prefixlen, ifindex, (unsigned int)label,
		  replace);

	newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label);
	if (IS_ERR(newp))
		return PTR_ERR(newp);
	spin_lock(&net->ipv6.ip6addrlbl_table.lock);
	ret = __ip6addrlbl_add(net, newp, replace);
	spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
	if (ret)
		kfree(newp);
	return ret;
}

/* remove a label */
static int __ip6addrlbl_del(struct net *net,
			    const struct in6_addr *prefix, int prefixlen,
			    int ifindex)
{
	struct ip6addrlbl_entry *p = NULL;
	struct hlist_node *n;
	int ret = -ESRCH;

	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
		  __func__, prefix, prefixlen, ifindex);

	hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
		if (p->prefixlen == prefixlen &&
		    p->ifindex == ifindex &&
		    ipv6_addr_equal(&p->prefix, prefix)) {
			hlist_del_rcu(&p->list);
			kfree_rcu(p, rcu);
			ret = 0;
			break;
		}
	}
	return ret;
}

static int ip6addrlbl_del(struct net *net,
			  const struct in6_addr *prefix, int prefixlen,
			  int ifindex)
{
	struct in6_addr prefix_buf;
	int ret;

	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
		  __func__, prefix, prefixlen, ifindex);

	ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
	spin_lock(&net->ipv6.ip6addrlbl_table.lock);
	ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
	spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
	return ret;
}

/* add default label */
static int __net_init ip6addrlbl_net_init(struct net *net)
{
	int err = 0;
	int i;

	ADDRLABEL(KERN_DEBUG "%s\n", __func__);

	spin_lock_init(&net->ipv6.ip6addrlbl_table.lock);
	INIT_HLIST_HEAD(&net->ipv6.ip6addrlbl_table.head);

	for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
		int ret = ip6addrlbl_add(net,
					 ip6addrlbl_init_table[i].prefix,
					 ip6addrlbl_init_table[i].prefixlen,
					 0,
					 ip6addrlbl_init_table[i].label, 0);
		/* XXX: should we free all rules when we catch an error? */
		if (ret && (!err || err != -ENOMEM))
			err = ret;
	}
	return err;
}

static void __net_exit ip6addrlbl_net_exit(struct net *net)
{
	struct ip6addrlbl_entry *p = NULL;
	struct hlist_node *n;

	/* Remove all labels belonging to the exiting net */
	spin_lock(&net->ipv6.ip6addrlbl_table.lock);
	hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
		hlist_del_rcu(&p->list);
		kfree_rcu(p, rcu);
	}
	spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
}

static struct pernet_operations ipv6_addr_label_ops = {
	.init = ip6addrlbl_net_init,
	.exit = ip6addrlbl_net_exit,
};

int __init ipv6_addr_label_init(void)
{
	return register_pernet_subsys(&ipv6_addr_label_ops);
}

void ipv6_addr_label_cleanup(void)
{
	unregister_pernet_subsys(&ipv6_addr_label_ops);
}

static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
	[IFAL_ADDRESS]		= { .len = sizeof(struct in6_addr), },
	[IFAL_LABEL]		= { .len = sizeof(u32), },
};

static bool addrlbl_ifindex_exists(struct net *net, int ifindex)
{

	struct net_device *dev;

	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
	rcu_read_unlock();

	return dev != NULL;
}

static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(skb->sk);
	struct ifaddrlblmsg *ifal;
	struct nlattr *tb[IFAL_MAX+1];
	struct in6_addr *pfx;
	u32 label;
	int err = 0;

	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
			  extack);
	if (err < 0)
		return err;

	ifal = nlmsg_data(nlh);

	if (ifal->ifal_family != AF_INET6 ||
	    ifal->ifal_prefixlen > 128)
		return -EINVAL;

	if (!tb[IFAL_ADDRESS])
		return -EINVAL;
	pfx = nla_data(tb[IFAL_ADDRESS]);

	if (!tb[IFAL_LABEL])
		return -EINVAL;
	label = nla_get_u32(tb[IFAL_LABEL]);
	if (label == IPV6_ADDR_LABEL_DEFAULT)
		return -EINVAL;

	switch (nlh->nlmsg_type) {
	case RTM_NEWADDRLABEL:
		if (ifal->ifal_index &&
		    !addrlbl_ifindex_exists(net, ifal->ifal_index))
			return -EINVAL;

		err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
				     ifal->ifal_index, label,
				     nlh->nlmsg_flags & NLM_F_REPLACE);
		break;
	case RTM_DELADDRLABEL:
		err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
				     ifal->ifal_index);
		break;
	default:
		err = -EOPNOTSUPP;
	}
	return err;
}

static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
			      int prefixlen, int ifindex, u32 lseq)
{
	struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
	ifal->ifal_family = AF_INET6;
	ifal->ifal_prefixlen = prefixlen;
	ifal->ifal_flags = 0;
	ifal->ifal_index = ifindex;
	ifal->ifal_seq = lseq;
};

static int ip6addrlbl_fill(struct sk_buff *skb,
			   struct ip6addrlbl_entry *p,
			   u32 lseq,
			   u32 portid, u32 seq, int event,
			   unsigned int flags)
{
	struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
					 sizeof(struct ifaddrlblmsg), flags);
	if (!nlh)
		return -EMSGSIZE;

	ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);

	if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 ||
	    nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
		nlmsg_cancel(skb, nlh);
		return -EMSGSIZE;
	}

	nlmsg_end(skb, nlh);
	return 0;
}

static int ip6addrlbl_valid_dump_req(const struct nlmsghdr *nlh,
				     struct netlink_ext_ack *extack)
{
	struct ifaddrlblmsg *ifal;

	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
		NL_SET_ERR_MSG_MOD(extack, "Invalid header for address label dump request");
		return -EINVAL;
	}

	ifal = nlmsg_data(nlh);
	if (ifal->__ifal_reserved || ifal->ifal_prefixlen ||
	    ifal->ifal_flags || ifal->ifal_index || ifal->ifal_seq) {
		NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address label dump request");
		return -EINVAL;
	}

	if (nlmsg_attrlen(nlh, sizeof(*ifal))) {
		NL_SET_ERR_MSG_MOD(extack, "Invalid data after header for address label dump requewst");
		return -EINVAL;
	}

	return 0;
}

static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	const struct nlmsghdr *nlh = cb->nlh;
	struct net *net = sock_net(skb->sk);
	struct ip6addrlbl_entry *p;
	int idx = 0, s_idx = cb->args[0];
	int err;

	if (cb->strict_check) {
		err = ip6addrlbl_valid_dump_req(nlh, cb->extack);
		if (err < 0)
			return err;
	}

	rcu_read_lock();
	hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
		if (idx >= s_idx) {
			err = ip6addrlbl_fill(skb, p,
					      net->ipv6.ip6addrlbl_table.seq,
					      NETLINK_CB(cb->skb).portid,
					      nlh->nlmsg_seq,
					      RTM_NEWADDRLABEL,
					      NLM_F_MULTI);
			if (err < 0)
				break;
		}
		idx++;
	}
	rcu_read_unlock();
	cb->args[0] = idx;
	return skb->len;
}

static inline int ip6addrlbl_msgsize(void)
{
	return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
		+ nla_total_size(16)	/* IFAL_ADDRESS */
		+ nla_total_size(4);	/* IFAL_LABEL */
}

static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
			  struct netlink_ext_ack *extack)
{
	struct net *net = sock_net(in_skb->sk);
	struct ifaddrlblmsg *ifal;
	struct nlattr *tb[IFAL_MAX+1];
	struct in6_addr *addr;
	u32 lseq;
	int err = 0;
	struct ip6addrlbl_entry *p;
	struct sk_buff *skb;

	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
			  extack);
	if (err < 0)
		return err;

	ifal = nlmsg_data(nlh);

	if (ifal->ifal_family != AF_INET6 ||
	    ifal->ifal_prefixlen != 128)
		return -EINVAL;

	if (ifal->ifal_index &&
	    !addrlbl_ifindex_exists(net, ifal->ifal_index))
		return -EINVAL;

	if (!tb[IFAL_ADDRESS])
		return -EINVAL;
	addr = nla_data(tb[IFAL_ADDRESS]);

	skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL);
	if (!skb)
		return -ENOBUFS;

	err = -ESRCH;

	rcu_read_lock();
	p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
	lseq = net->ipv6.ip6addrlbl_table.seq;
	if (p)
		err = ip6addrlbl_fill(skb, p, lseq,
				      NETLINK_CB(in_skb).portid,
				      nlh->nlmsg_seq,
				      RTM_NEWADDRLABEL, 0);
	rcu_read_unlock();

	if (err < 0) {
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
	} else {
		err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
	}
	return err;
}

int __init ipv6_addr_label_rtnl_register(void)
{
	int ret;

	ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDRLABEL,
				   ip6addrlbl_newdel,
				   NULL, RTNL_FLAG_DOIT_UNLOCKED);
	if (ret < 0)
		return ret;
	ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDRLABEL,
				   ip6addrlbl_newdel,
				   NULL, RTNL_FLAG_DOIT_UNLOCKED);
	if (ret < 0)
		return ret;
	ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDRLABEL,
				   ip6addrlbl_get,
				   ip6addrlbl_dump, RTNL_FLAG_DOIT_UNLOCKED);
	return ret;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
2a8cc6c8 YH	2	/*
	3	* IPv6 Address Label subsystem
	4	* for the IPv6 "Default" Source Address Selection
	5	*
	6	* Copyright (C)2007 USAGI/WIDE Project
	7	*/
	8	/*
	9	* Author:
1c8669e0	10	* YOSHIFUJI Hideaki @ USAGI/WIDE Project <yoshfuji@linux-ipv6.org>
2a8cc6c8 YH	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/list.h>
	15	#include <linux/rcupdate.h>
	16	#include <linux/in6.h>
5a0e3ad6	17	#include <linux/slab.h>
2a8cc6c8 YH	18	#include <net/addrconf.h>
	19	#include <linux/if_addrlabel.h>
	20	#include <linux/netlink.h>
	21	#include <linux/rtnetlink.h>
	22
	23	#if 0
	24	#define ADDRLABEL(x...) printk(x)
	25	#else
1c8669e0	26	#define ADDRLABEL(x...) do { ; } while (0)
2a8cc6c8 YH	27	#endif
	28
	29	/*
	30	* Policy Table
	31	*/
22b285d6	32	struct ip6addrlbl_entry {
2a8cc6c8 YH	33	struct in6_addr prefix;
	34	int prefixlen;
	35	int ifindex;
	36	int addrtype;
	37	u32 label;
	38	struct hlist_node list;
2a8cc6c8 YH	39	struct rcu_head rcu;
	40	};
	41
2a8cc6c8	42	/*
417962a0	43	* Default policy table (RFC6724 + extensions)
2a8cc6c8 YH	44	*
	45	* prefix addr_type label
	46	* -------------------------------------------------------------------------
	47	* ::1/128 LOOPBACK 0
	48	* ::/0 N/A 1
	49	* 2002::/16 N/A 2
	50	* ::/96 COMPATv4 3
	51	* ::ffff:0:0/96 V4MAPPED 4
	52	* fc00::/7 N/A 5 ULA (RFC 4193)
	53	* 2001::/32 N/A 6 Teredo (RFC 4380)
5fe47b8a	54	* 2001:10::/28 N/A 7 ORCHID (RFC 4843)
417962a0 YH	55	* fec0::/10 N/A 11 Site-local
	56	* (deprecated by RFC3879)
	57	* 3ffe::/16 N/A 12 6bone
2a8cc6c8 YH	58	*
2a8cc6c8 YH	59	* Note: 0xffffffff is used if we do not have any policies.
417962a0	60	* Note: Labels for ULA and 6to4 are different from labels listed in RFC6724.
2a8cc6c8 YH	61	*/
	62
	63	#define IPV6_ADDR_LABEL_DEFAULT 0xffffffffUL
	64
04a6f82c	65	static const __net_initconst struct ip6addrlbl_init_table
2a8cc6c8 YH	66	{
	67	const struct in6_addr *prefix;
	68	int prefixlen;
	69	u32 label;
	70	} ip6addrlbl_init_table[] = {
	71	{ /* ::/0 */
	72	.prefix = &in6addr_any,
	73	.label = 1,
1c8669e0 WY	74	}, { /* fc00::/7 */
1c8669e0 WY	75	.prefix = &(struct in6_addr){ { { 0xfc } } } ,
2a8cc6c8 YH	76	.prefixlen = 7,
2a8cc6c8 YH	77	.label = 5,
1c8669e0 WY	78	}, { /* fec0::/10 */
1c8669e0 WY	79	.prefix = &(struct in6_addr){ { { 0xfe, 0xc0 } } },
417962a0 YH	80	.prefixlen = 10,
417962a0 YH	81	.label = 11,
1c8669e0 WY	82	}, { /* 2002::/16 */
1c8669e0 WY	83	.prefix = &(struct in6_addr){ { { 0x20, 0x02 } } },
2a8cc6c8 YH	84	.prefixlen = 16,
2a8cc6c8 YH	85	.label = 2,
1c8669e0 WY	86	}, { /* 3ffe::/16 */
1c8669e0 WY	87	.prefix = &(struct in6_addr){ { { 0x3f, 0xfe } } },
417962a0 YH	88	.prefixlen = 16,
417962a0 YH	89	.label = 12,
1c8669e0 WY	90	}, { /* 2001::/32 */
1c8669e0 WY	91	.prefix = &(struct in6_addr){ { { 0x20, 0x01 } } },
2a8cc6c8 YH	92	.prefixlen = 32,
2a8cc6c8 YH	93	.label = 6,
1c8669e0 WY	94	}, { /* 2001:10::/28 */
1c8669e0 WY	95	.prefix = &(struct in6_addr){ { { 0x20, 0x01, 0x00, 0x10 } } },
5fe47b8a JMT	96	.prefixlen = 28,
5fe47b8a JMT	97	.label = 7,
1c8669e0 WY	98	}, { /* ::ffff:0:0 */
1c8669e0 WY	99	.prefix = &(struct in6_addr){ { { [10] = 0xff, [11] = 0xff } } },
2a8cc6c8 YH	100	.prefixlen = 96,
2a8cc6c8 YH	101	.label = 4,
1c8669e0	102	}, { /* ::/96 */
2a8cc6c8 YH	103	.prefix = &in6addr_any,
	104	.prefixlen = 96,
	105	.label = 3,
1c8669e0	106	}, { /* ::1/128 */
2a8cc6c8 YH	107	.prefix = &in6addr_loopback,
	108	.prefixlen = 128,
	109	.label = 0,
	110	}
	111	};
	112
2a8cc6c8	113	/* Find label */
a90c9347	114	static bool __ip6addrlbl_match(const struct ip6addrlbl_entry *p,
a50feda5 ED	115	const struct in6_addr *addr,
a50feda5 ED	116	int addrtype, int ifindex)
2a8cc6c8 YH	117	{
2a8cc6c8 YH	118	if (p->ifindex && p->ifindex != ifindex)
a50feda5	119	return false;
2a8cc6c8	120	if (p->addrtype && p->addrtype != addrtype)
a50feda5	121	return false;
2a8cc6c8	122	if (!ipv6_prefix_equal(addr, &p->prefix, p->prefixlen))
a50feda5 ED	123	return false;
a50feda5 ED	124	return true;
2a8cc6c8 YH	125	}
2a8cc6c8 YH	126
3de23255 BT	127	static struct ip6addrlbl_entry __ipv6_addr_label(struct net net,
3de23255 BT	128	const struct in6_addr *addr,
2a8cc6c8 YH	129	int type, int ifindex)
2a8cc6c8 YH	130	{
2a8cc6c8	131	struct ip6addrlbl_entry *p;
a90c9347 ED	132
	133	hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
	134	if (__ip6addrlbl_match(p, addr, type, ifindex))
2a8cc6c8 YH	135	return p;
	136	}
	137	return NULL;
	138	}
	139
3de23255 BT	140	u32 ipv6_addr_label(struct net *net,
3de23255 BT	141	const struct in6_addr *addr, int type, int ifindex)
2a8cc6c8 YH	142	{
	143	u32 label;
	144	struct ip6addrlbl_entry *p;
	145
	146	type &= IPV6_ADDR_MAPPED \| IPV6_ADDR_COMPATv4 \| IPV6_ADDR_LOOPBACK;
	147
	148	rcu_read_lock();
3de23255	149	p = __ipv6_addr_label(net, addr, type, ifindex);
2a8cc6c8 YH	150	label = p ? p->label : IPV6_ADDR_LABEL_DEFAULT;
	151	rcu_read_unlock();
	152
5b095d98	153	ADDRLABEL(KERN_DEBUG "%s(addr=%pI6, type=%d, ifindex=%d) => %08x\n",
0c6ce78a	154	__func__, addr, type, ifindex, label);
2a8cc6c8 YH	155
	156	return label;
	157	}
	158
	159	/* allocate one entry */
a90c9347	160	static struct ip6addrlbl_entry ip6addrlbl_alloc(const struct in6_addr prefix,
40fee36e YH	161	int prefixlen, int ifindex,
40fee36e YH	162	u32 label)
2a8cc6c8 YH	163	{
	164	struct ip6addrlbl_entry *newp;
	165	int addrtype;
	166
5b095d98	167	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u)\n",
0c6ce78a	168	__func__, prefix, prefixlen, ifindex, (unsigned int)label);
2a8cc6c8 YH	169
	170	addrtype = ipv6_addr_type(prefix) & (IPV6_ADDR_MAPPED \| IPV6_ADDR_COMPATv4 \| IPV6_ADDR_LOOPBACK);
	171
	172	switch (addrtype) {
	173	case IPV6_ADDR_MAPPED:
	174	if (prefixlen > 96)
	175	return ERR_PTR(-EINVAL);
	176	if (prefixlen < 96)
	177	addrtype = 0;
	178	break;
	179	case IPV6_ADDR_COMPATv4:
	180	if (prefixlen != 96)
	181	addrtype = 0;
	182	break;
	183	case IPV6_ADDR_LOOPBACK:
	184	if (prefixlen != 128)
	185	addrtype = 0;
	186	break;
	187	}
	188
	189	newp = kmalloc(sizeof(*newp), GFP_KERNEL);
	190	if (!newp)
	191	return ERR_PTR(-ENOMEM);
	192
	193	ipv6_addr_prefix(&newp->prefix, prefix, prefixlen);
	194	newp->prefixlen = prefixlen;
	195	newp->ifindex = ifindex;
	196	newp->addrtype = addrtype;
	197	newp->label = label;
	198	INIT_HLIST_NODE(&newp->list);
2a8cc6c8 YH	199	return newp;
	200	}
	201
	202	/* add a label */
a90c9347 ED	203	static int __ip6addrlbl_add(struct net net, struct ip6addrlbl_entry newp,
a90c9347 ED	204	int replace)
2a8cc6c8	205	{
639739b5	206	struct ip6addrlbl_entry last = NULL, p = NULL;
a90c9347	207	struct hlist_node *n;
2a8cc6c8 YH	208	int ret = 0;
2a8cc6c8 YH	209
639739b5 HFS	210	ADDRLABEL(KERN_DEBUG "%s(newp=%p, replace=%d)\n", __func__, newp,
639739b5 HFS	211	replace);
2a8cc6c8	212
a90c9347	213	hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
639739b5	214	if (p->prefixlen == newp->prefixlen &&
639739b5 HFS	215	p->ifindex == newp->ifindex &&
	216	ipv6_addr_equal(&p->prefix, &newp->prefix)) {
	217	if (!replace) {
	218	ret = -EEXIST;
2a8cc6c8 YH	219	goto out;
2a8cc6c8 YH	220	}
639739b5	221	hlist_replace_rcu(&p->list, &newp->list);
2809c095	222	kfree_rcu(p, rcu);
639739b5 HFS	223	goto out;
	224	} else if ((p->prefixlen == newp->prefixlen && !p->ifindex) \|\|
	225	(p->prefixlen < newp->prefixlen)) {
	226	hlist_add_before_rcu(&newp->list, &p->list);
	227	goto out;
2a8cc6c8	228	}
639739b5	229	last = p;
2a8cc6c8	230	}
639739b5	231	if (last)
1d023284	232	hlist_add_behind_rcu(&newp->list, &last->list);
639739b5	233	else
a90c9347	234	hlist_add_head_rcu(&newp->list, &net->ipv6.ip6addrlbl_table.head);
2a8cc6c8 YH	235	out:
2a8cc6c8 YH	236	if (!ret)
a90c9347	237	net->ipv6.ip6addrlbl_table.seq++;
2a8cc6c8 YH	238	return ret;
	239	}
	240
	241	/* add a label */
3de23255 BT	242	static int ip6addrlbl_add(struct net *net,
3de23255 BT	243	const struct in6_addr *prefix, int prefixlen,
40fee36e	244	int ifindex, u32 label, int replace)
2a8cc6c8 YH	245	{
	246	struct ip6addrlbl_entry *newp;
	247	int ret = 0;
	248
5b095d98	249	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d, label=%u, replace=%d)\n",
0c6ce78a HH	250	__func__, prefix, prefixlen, ifindex, (unsigned int)label,
0c6ce78a HH	251	replace);
2a8cc6c8	252
a90c9347	253	newp = ip6addrlbl_alloc(prefix, prefixlen, ifindex, label);
2a8cc6c8 YH	254	if (IS_ERR(newp))
2a8cc6c8 YH	255	return PTR_ERR(newp);
a90c9347 ED	256	spin_lock(&net->ipv6.ip6addrlbl_table.lock);
	257	ret = __ip6addrlbl_add(net, newp, replace);
	258	spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
2a8cc6c8	259	if (ret)
2809c095	260	kfree(newp);
2a8cc6c8 YH	261	return ret;
	262	}
	263
	264	/* remove a label */
3de23255 BT	265	static int __ip6addrlbl_del(struct net *net,
3de23255 BT	266	const struct in6_addr *prefix, int prefixlen,
40fee36e	267	int ifindex)
2a8cc6c8 YH	268	{
2a8cc6c8 YH	269	struct ip6addrlbl_entry *p = NULL;
b67bfe0d	270	struct hlist_node *n;
2a8cc6c8 YH	271	int ret = -ESRCH;
2a8cc6c8 YH	272
5b095d98	273	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
0c6ce78a	274	__func__, prefix, prefixlen, ifindex);
2a8cc6c8	275
a90c9347	276	hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
2a8cc6c8 YH	277	if (p->prefixlen == prefixlen &&
	278	p->ifindex == ifindex &&
	279	ipv6_addr_equal(&p->prefix, prefix)) {
	280	hlist_del_rcu(&p->list);
2809c095	281	kfree_rcu(p, rcu);
2a8cc6c8 YH	282	ret = 0;
	283	break;
	284	}
	285	}
	286	return ret;
	287	}
	288
3de23255 BT	289	static int ip6addrlbl_del(struct net *net,
3de23255 BT	290	const struct in6_addr *prefix, int prefixlen,
40fee36e	291	int ifindex)
2a8cc6c8 YH	292	{
	293	struct in6_addr prefix_buf;
	294	int ret;
	295
5b095d98	296	ADDRLABEL(KERN_DEBUG "%s(prefix=%pI6, prefixlen=%d, ifindex=%d)\n",
0c6ce78a	297	__func__, prefix, prefixlen, ifindex);
2a8cc6c8 YH	298
2a8cc6c8 YH	299	ipv6_addr_prefix(&prefix_buf, prefix, prefixlen);
a90c9347	300	spin_lock(&net->ipv6.ip6addrlbl_table.lock);
3de23255	301	ret = __ip6addrlbl_del(net, &prefix_buf, prefixlen, ifindex);
a90c9347	302	spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
2a8cc6c8 YH	303	return ret;
	304	}
	305
	306	/* add default label */
3de23255	307	static int __net_init ip6addrlbl_net_init(struct net *net)
2a8cc6c8 YH	308	{
	309	int err = 0;
	310	int i;
	311
f3213831	312	ADDRLABEL(KERN_DEBUG "%s\n", __func__);
2a8cc6c8	313
a90c9347 ED	314	spin_lock_init(&net->ipv6.ip6addrlbl_table.lock);
	315	INIT_HLIST_HEAD(&net->ipv6.ip6addrlbl_table.head);
	316
2a8cc6c8	317	for (i = 0; i < ARRAY_SIZE(ip6addrlbl_init_table); i++) {
3de23255 BT	318	int ret = ip6addrlbl_add(net,
3de23255 BT	319	ip6addrlbl_init_table[i].prefix,
2a8cc6c8 YH	320	ip6addrlbl_init_table[i].prefixlen,
	321	0,
	322	ip6addrlbl_init_table[i].label, 0);
	323	/* XXX: should we free all rules when we catch an error? */
	324	if (ret && (!err \|\| err != -ENOMEM))
	325	err = ret;
	326	}
	327	return err;
	328	}
	329
3de23255 BT	330	static void __net_exit ip6addrlbl_net_exit(struct net *net)
	331	{
	332	struct ip6addrlbl_entry *p = NULL;
b67bfe0d	333	struct hlist_node *n;
3de23255 BT	334
3de23255 BT	335	/* Remove all labels belonging to the exiting net */
a90c9347 ED	336	spin_lock(&net->ipv6.ip6addrlbl_table.lock);
	337	hlist_for_each_entry_safe(p, n, &net->ipv6.ip6addrlbl_table.head, list) {
	338	hlist_del_rcu(&p->list);
2809c095	339	kfree_rcu(p, rcu);
3de23255	340	}
a90c9347	341	spin_unlock(&net->ipv6.ip6addrlbl_table.lock);
3de23255 BT	342	}
	343
	344	static struct pernet_operations ipv6_addr_label_ops = {
	345	.init = ip6addrlbl_net_init,
	346	.exit = ip6addrlbl_net_exit,
	347	};
	348
2a8cc6c8 YH	349	int __init ipv6_addr_label_init(void)
2a8cc6c8 YH	350	{
3de23255	351	return register_pernet_subsys(&ipv6_addr_label_ops);
2a8cc6c8 YH	352	}
2a8cc6c8 YH	353
2cc6d2bf NH	354	void ipv6_addr_label_cleanup(void)
	355	{
	356	unregister_pernet_subsys(&ipv6_addr_label_ops);
	357	}
	358
2a8cc6c8 YH	359	static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
	360	[IFAL_ADDRESS] = { .len = sizeof(struct in6_addr), },
	361	[IFAL_LABEL] = { .len = sizeof(u32), },
	362	};
	363
a6f57028 FW	364	static bool addrlbl_ifindex_exists(struct net *net, int ifindex)
	365	{
	366
	367	struct net_device *dev;
	368
	369	rcu_read_lock();
	370	dev = dev_get_by_index_rcu(net, ifindex);
	371	rcu_read_unlock();
	372
	373	return dev != NULL;
	374	}
	375
c21ef3e3 DA	376	static int ip6addrlbl_newdel(struct sk_buff skb, struct nlmsghdr nlh,
c21ef3e3 DA	377	struct netlink_ext_ack *extack)
2a8cc6c8	378	{
3b1e0a65	379	struct net *net = sock_net(skb->sk);
2a8cc6c8 YH	380	struct ifaddrlblmsg *ifal;
	381	struct nlattr *tb[IFAL_MAX+1];
	382	struct in6_addr *pfx;
	383	u32 label;
	384	int err = 0;
	385
c21ef3e3 DA	386	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
c21ef3e3 DA	387	extack);
2a8cc6c8 YH	388	if (err < 0)
	389	return err;
	390
	391	ifal = nlmsg_data(nlh);
	392
	393	if (ifal->ifal_family != AF_INET6 \|\|
	394	ifal->ifal_prefixlen > 128)
	395	return -EINVAL;
	396
2a8cc6c8 YH	397	if (!tb[IFAL_ADDRESS])
2a8cc6c8 YH	398	return -EINVAL;
2a8cc6c8	399	pfx = nla_data(tb[IFAL_ADDRESS]);
2a8cc6c8 YH	400
	401	if (!tb[IFAL_LABEL])
	402	return -EINVAL;
	403	label = nla_get_u32(tb[IFAL_LABEL]);
	404	if (label == IPV6_ADDR_LABEL_DEFAULT)
	405	return -EINVAL;
	406
1c8669e0	407	switch (nlh->nlmsg_type) {
2a8cc6c8	408	case RTM_NEWADDRLABEL:
0771275b	409	if (ifal->ifal_index &&
a6f57028	410	!addrlbl_ifindex_exists(net, ifal->ifal_index))
0771275b FW	411	return -EINVAL;
0771275b FW	412
3de23255	413	err = ip6addrlbl_add(net, pfx, ifal->ifal_prefixlen,
2a8cc6c8 YH	414	ifal->ifal_index, label,
	415	nlh->nlmsg_flags & NLM_F_REPLACE);
	416	break;
	417	case RTM_DELADDRLABEL:
3de23255	418	err = ip6addrlbl_del(net, pfx, ifal->ifal_prefixlen,
2a8cc6c8 YH	419	ifal->ifal_index);
	420	break;
	421	default:
	422	err = -EOPNOTSUPP;
	423	}
	424	return err;
	425	}
	426
a50feda5 ED	427	static void ip6addrlbl_putmsg(struct nlmsghdr *nlh,
a50feda5 ED	428	int prefixlen, int ifindex, u32 lseq)
2a8cc6c8 YH	429	{
	430	struct ifaddrlblmsg *ifal = nlmsg_data(nlh);
	431	ifal->ifal_family = AF_INET6;
	432	ifal->ifal_prefixlen = prefixlen;
	433	ifal->ifal_flags = 0;
	434	ifal->ifal_index = ifindex;
	435	ifal->ifal_seq = lseq;
	436	};
	437
	438	static int ip6addrlbl_fill(struct sk_buff *skb,
	439	struct ip6addrlbl_entry *p,
	440	u32 lseq,
15e47304	441	u32 portid, u32 seq, int event,
2a8cc6c8 YH	442	unsigned int flags)
2a8cc6c8 YH	443	{
15e47304	444	struct nlmsghdr *nlh = nlmsg_put(skb, portid, seq, event,
2a8cc6c8 YH	445	sizeof(struct ifaddrlblmsg), flags);
	446	if (!nlh)
	447	return -EMSGSIZE;
	448
	449	ip6addrlbl_putmsg(nlh, p->prefixlen, p->ifindex, lseq);
	450
930345ea	451	if (nla_put_in6_addr(skb, IFAL_ADDRESS, &p->prefix) < 0 \|\|
2a8cc6c8 YH	452	nla_put_u32(skb, IFAL_LABEL, p->label) < 0) {
	453	nlmsg_cancel(skb, nlh);
	454	return -EMSGSIZE;
	455	}
	456
053c095a JB	457	nlmsg_end(skb, nlh);
053c095a JB	458	return 0;
2a8cc6c8 YH	459	}
2a8cc6c8 YH	460
f2ae64bb DA	461	static int ip6addrlbl_valid_dump_req(const struct nlmsghdr *nlh,
	462	struct netlink_ext_ack *extack)
	463	{
	464	struct ifaddrlblmsg *ifal;
	465
	466	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
	467	NL_SET_ERR_MSG_MOD(extack, "Invalid header for address label dump request");
	468	return -EINVAL;
	469	}
	470
	471	ifal = nlmsg_data(nlh);
	472	if (ifal->__ifal_reserved \|\| ifal->ifal_prefixlen \|\|
	473	ifal->ifal_flags \|\| ifal->ifal_index \|\| ifal->ifal_seq) {
	474	NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address label dump request");
	475	return -EINVAL;
	476	}
	477
	478	if (nlmsg_attrlen(nlh, sizeof(*ifal))) {
	479	NL_SET_ERR_MSG_MOD(extack, "Invalid data after header for address label dump requewst");
	480	return -EINVAL;
	481	}
	482
	483	return 0;
	484	}
	485
2a8cc6c8 YH	486	static int ip6addrlbl_dump(struct sk_buff skb, struct netlink_callback cb)
2a8cc6c8 YH	487	{
f2ae64bb	488	const struct nlmsghdr *nlh = cb->nlh;
3b1e0a65	489	struct net *net = sock_net(skb->sk);
2a8cc6c8	490	struct ip6addrlbl_entry *p;
2a8cc6c8 YH	491	int idx = 0, s_idx = cb->args[0];
	492	int err;
	493
f2ae64bb DA	494	if (cb->strict_check) {
	495	err = ip6addrlbl_valid_dump_req(nlh, cb->extack);
	496	if (err < 0)
	497	return err;
	498	}
	499
2a8cc6c8	500	rcu_read_lock();
a90c9347 ED	501	hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
a90c9347 ED	502	if (idx >= s_idx) {
cb6e926e	503	err = ip6addrlbl_fill(skb, p,
a90c9347	504	net->ipv6.ip6addrlbl_table.seq,
cb6e926e	505	NETLINK_CB(cb->skb).portid,
f2ae64bb	506	nlh->nlmsg_seq,
cb6e926e WY	507	RTM_NEWADDRLABEL,
cb6e926e WY	508	NLM_F_MULTI);
053c095a	509	if (err < 0)
2a8cc6c8 YH	510	break;
	511	}
	512	idx++;
	513	}
	514	rcu_read_unlock();
	515	cb->args[0] = idx;
	516	return skb->len;
	517	}
	518
	519	static inline int ip6addrlbl_msgsize(void)
	520	{
a02cec21	521	return NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))
2a8cc6c8	522	+ nla_total_size(16) /* IFAL_ADDRESS */
a02cec21	523	+ nla_total_size(4); /* IFAL_LABEL */
2a8cc6c8 YH	524	}
2a8cc6c8 YH	525
c21ef3e3 DA	526	static int ip6addrlbl_get(struct sk_buff in_skb, struct nlmsghdr nlh,
c21ef3e3 DA	527	struct netlink_ext_ack *extack)
2a8cc6c8	528	{
3b1e0a65	529	struct net *net = sock_net(in_skb->sk);
2a8cc6c8 YH	530	struct ifaddrlblmsg *ifal;
	531	struct nlattr *tb[IFAL_MAX+1];
	532	struct in6_addr *addr;
	533	u32 lseq;
	534	int err = 0;
	535	struct ip6addrlbl_entry *p;
	536	struct sk_buff *skb;
	537
c21ef3e3 DA	538	err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
c21ef3e3 DA	539	extack);
2a8cc6c8 YH	540	if (err < 0)
	541	return err;
	542
	543	ifal = nlmsg_data(nlh);
	544
	545	if (ifal->ifal_family != AF_INET6 \|\|
	546	ifal->ifal_prefixlen != 128)
	547	return -EINVAL;
	548
	549	if (ifal->ifal_index &&
a6f57028	550	!addrlbl_ifindex_exists(net, ifal->ifal_index))
2a8cc6c8 YH	551	return -EINVAL;
	552
	553	if (!tb[IFAL_ADDRESS])
	554	return -EINVAL;
2a8cc6c8	555	addr = nla_data(tb[IFAL_ADDRESS]);
2a8cc6c8	556
cb6e926e	557	skb = nlmsg_new(ip6addrlbl_msgsize(), GFP_KERNEL);
66c77ff3	558	if (!skb)
2a8cc6c8	559	return -ENOBUFS;
2a8cc6c8	560
66c77ff3	561	err = -ESRCH;
2a8cc6c8	562
66c77ff3 ED	563	rcu_read_lock();
	564	p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
	565	lseq = net->ipv6.ip6addrlbl_table.seq;
	566	if (p)
	567	err = ip6addrlbl_fill(skb, p, lseq,
	568	NETLINK_CB(in_skb).portid,
	569	nlh->nlmsg_seq,
	570	RTM_NEWADDRLABEL, 0);
	571	rcu_read_unlock();
2a8cc6c8 YH	572
	573	if (err < 0) {
	574	WARN_ON(err == -EMSGSIZE);
	575	kfree_skb(skb);
66c77ff3 ED	576	} else {
66c77ff3 ED	577	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2a8cc6c8	578	}
2a8cc6c8 YH	579	return err;
	580	}
	581
a3fde2ad	582	int __init ipv6_addr_label_rtnl_register(void)
2a8cc6c8	583	{
a3fde2ad FW	584	int ret;
	585
	586	ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDRLABEL,
	587	ip6addrlbl_newdel,
	588	NULL, RTNL_FLAG_DOIT_UNLOCKED);
	589	if (ret < 0)
	590	return ret;
	591	ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDRLABEL,
	592	ip6addrlbl_newdel,
	593	NULL, RTNL_FLAG_DOIT_UNLOCKED);
	594	if (ret < 0)
	595	return ret;
	596	ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDRLABEL,
	597	ip6addrlbl_get,
	598	ip6addrlbl_dump, RTNL_FLAG_DOIT_UNLOCKED);
	599	return ret;
2a8cc6c8	600	}