Initial import

1 files changed, 5859 insertions, 0 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
new file mode 100644
index 000000000..37b70e82b
--- /dev/null
+++ b/net/ipv6/addrconf.c
@@ -0,0 +1,5859 @@
+/*
+ *	IPv6 Address [auto]configuration
+ *	Linux INET6 implementation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>
+ *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
+ *
+ *	This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+/*
+ *	Changes:
+ *
+ *	Janos Farkas			:	delete timer on ifdown
+ *	<chexum@bankinf.banki.hu>
+ *	Andi Kleen			:	kill double kfree on module
+ *						unload.
+ *	Maciej W. Rozycki		:	FDDI support
+ *	sekiya@USAGI			:	Don't send too many RS
+ *						packets.
+ *	yoshfuji@USAGI			:       Fixed interval between DAD
+ *						packets.
+ *	YOSHIFUJI Hideaki @USAGI	:	improved accuracy of
+ *						address validation timer.
+ *	YOSHIFUJI Hideaki @USAGI	:	Privacy Extensions (RFC3041)
+ *						support.
+ *	Yuji SEKIYA @USAGI		:	Don't assign a same IPv6
+ *						address on a same interface.
+ *	YOSHIFUJI Hideaki @USAGI	:	ARCnet support
+ *	YOSHIFUJI Hideaki @USAGI	:	convert /proc/net/if_inet6 to
+ *						seq_file.
+ *	YOSHIFUJI Hideaki @USAGI	:	improved source address
+ *						selection; consider scope,
+ *						status etc.
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_addr.h>
+#include <linux/if_arp.h>
+#include <linux/if_arcnet.h>
+#include <linux/if_infiniband.h>
+#include <linux/route.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <linux/capability.h>
+#include <linux/delay.h>
+#include <linux/notifier.h>
+#include <linux/string.h>
+#include <linux/hash.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/af_ieee802154.h>
+#include <net/firewire.h>
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/tcp.h>
+#include <net/ip.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/if_tunnel.h>
+#include <linux/rtnetlink.h>
+#include <linux/netconf.h>
+#include <linux/random.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+
+/* Set to 3 to get tracing... */
+#define ACONF_DEBUG 2
+
+#if ACONF_DEBUG >= 3
+#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
+#else
+#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
+#endif
+
+#define	INFINITY_LIFE_TIME	0xFFFFFFFF
+
+#define IPV6_MAX_STRLEN \
+	sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
+
+static inline u32 cstamp_delta(unsigned long cstamp)
+{
+	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
+}
+
+#ifdef CONFIG_SYSCTL
+static int addrconf_sysctl_register(struct inet6_dev *idev);
+static void addrconf_sysctl_unregister(struct inet6_dev *idev);
+#else
+static inline int addrconf_sysctl_register(struct inet6_dev *idev)
+{
+	return 0;
+}
+
+static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+}
+#endif
+
+static void __ipv6_regen_rndid(struct inet6_dev *idev);
+static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
+static void ipv6_regen_rndid(unsigned long data);
+
+static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
+static int ipv6_count_addresses(struct inet6_dev *idev);
+static int ipv6_generate_stable_address(struct in6_addr *addr,
+					u8 dad_count,
+					const struct inet6_dev *idev);
+
+/*
+ *	Configured unicast address hash table
+ */
+static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
+static DEFINE_SPINLOCK(addrconf_hash_lock);
+
+static void addrconf_verify(void);
+static void addrconf_verify_rtnl(void);
+static void addrconf_verify_work(struct work_struct *);
+
+static struct workqueue_struct *addrconf_wq;
+static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
+
+static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
+static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
+
+static void addrconf_type_change(struct net_device *dev,
+				 unsigned long event);
+static int addrconf_ifdown(struct net_device *dev, int how);
+
+static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+						  int plen,
+						  const struct net_device *dev,
+						  u32 flags, u32 noflags);
+
+static void addrconf_dad_start(struct inet6_ifaddr *ifp);
+static void addrconf_dad_work(struct work_struct *w);
+static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
+static void addrconf_dad_run(struct inet6_dev *idev);
+static void addrconf_rs_timer(unsigned long data);
+static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
+static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
+
+static void inet6_prefix_notify(int event, struct inet6_dev *idev,
+				struct prefix_info *pinfo);
+static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
+			       struct net_device *dev);
+
+static struct ipv6_devconf ipv6_devconf __read_mostly = {
+	.forwarding		= 0,
+	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
+	.mtu6			= IPV6_MIN_MTU,
+	.accept_ra		= 1,
+	.accept_redirects	= 1,
+	.autoconf		= 1,
+	.force_mld_version	= 0,
+	.mldv1_unsolicited_report_interval = 10 * HZ,
+	.mldv2_unsolicited_report_interval = HZ,
+	.dad_transmits		= 1,
+	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
+	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
+	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
+	.use_tempaddr		= 0,
+	.temp_valid_lft		= TEMP_VALID_LIFETIME,
+	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
+	.regen_max_retry	= REGEN_MAX_RETRY,
+	.max_desync_factor	= MAX_DESYNC_FACTOR,
+	.max_addresses		= IPV6_MAX_ADDRESSES,
+	.accept_ra_defrtr	= 1,
+	.accept_ra_from_local	= 0,
+	.accept_ra_pinfo	= 1,
+#ifdef CONFIG_IPV6_ROUTER_PREF
+	.accept_ra_rtr_pref	= 1,
+	.rtr_probe_interval	= 60 * HZ,
+#ifdef CONFIG_IPV6_ROUTE_INFO
+	.accept_ra_rt_info_max_plen = 0,
+#endif
+#endif
+	.proxy_ndp		= 0,
+	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
+	.disable_ipv6		= 0,
+	.accept_dad		= 1,
+	.suppress_frag_ndisc	= 1,
+	.accept_ra_mtu		= 1,
+	.stable_secret		= {
+		.initialized = false,
+	}
+};
+
+static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
+	.forwarding		= 0,
+	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
+	.mtu6			= IPV6_MIN_MTU,
+	.accept_ra		= 1,
+	.accept_redirects	= 1,
+	.autoconf		= 1,
+	.force_mld_version	= 0,
+	.mldv1_unsolicited_report_interval = 10 * HZ,
+	.mldv2_unsolicited_report_interval = HZ,
+	.dad_transmits		= 1,
+	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
+	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
+	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
+	.use_tempaddr		= 0,
+	.temp_valid_lft		= TEMP_VALID_LIFETIME,
+	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
+	.regen_max_retry	= REGEN_MAX_RETRY,
+	.max_desync_factor	= MAX_DESYNC_FACTOR,
+	.max_addresses		= IPV6_MAX_ADDRESSES,
+	.accept_ra_defrtr	= 1,
+	.accept_ra_from_local	= 0,
+	.accept_ra_pinfo	= 1,
+#ifdef CONFIG_IPV6_ROUTER_PREF
+	.accept_ra_rtr_pref	= 1,
+	.rtr_probe_interval	= 60 * HZ,
+#ifdef CONFIG_IPV6_ROUTE_INFO
+	.accept_ra_rt_info_max_plen = 0,
+#endif
+#endif
+	.proxy_ndp		= 0,
+	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
+	.disable_ipv6		= 0,
+	.accept_dad		= 1,
+	.suppress_frag_ndisc	= 1,
+	.accept_ra_mtu		= 1,
+	.stable_secret		= {
+		.initialized = false,
+	},
+};
+
+/* Check if a valid qdisc is available */
+static inline bool addrconf_qdisc_ok(const struct net_device *dev)
+{
+	return !qdisc_tx_is_noop(dev);
+}
+
+static void addrconf_del_rs_timer(struct inet6_dev *idev)
+{
+	if (del_timer(&idev->rs_timer))
+		__in6_dev_put(idev);
+}
+
+static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
+{
+	if (cancel_delayed_work(&ifp->dad_work))
+		__in6_ifa_put(ifp);
+}
+
+static void addrconf_mod_rs_timer(struct inet6_dev *idev,
+				  unsigned long when)
+{
+	if (!timer_pending(&idev->rs_timer))
+		in6_dev_hold(idev);
+	mod_timer(&idev->rs_timer, jiffies + when);
+}
+
+static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
+				   unsigned long delay)
+{
+	if (!delayed_work_pending(&ifp->dad_work))
+		in6_ifa_hold(ifp);
+	mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
+}
+
+static int snmp6_alloc_dev(struct inet6_dev *idev)
+{
+	int i;
+
+	idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
+	if (!idev->stats.ipv6)
+		goto err_ip;
+
+	for_each_possible_cpu(i) {
+		struct ipstats_mib *addrconf_stats;
+		addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
+		u64_stats_init(&addrconf_stats->syncp);
+	}
+
+
+	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
+					GFP_KERNEL);
+	if (!idev->stats.icmpv6dev)
+		goto err_icmp;
+	idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
+					   GFP_KERNEL);
+	if (!idev->stats.icmpv6msgdev)
+		goto err_icmpmsg;
+
+	return 0;
+
+err_icmpmsg:
+	kfree(idev->stats.icmpv6dev);
+err_icmp:
+	free_percpu(idev->stats.ipv6);
+err_ip:
+	return -ENOMEM;
+}
+
+static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
+{
+	struct inet6_dev *ndev;
+	int err = -ENOMEM;
+
+	ASSERT_RTNL();
+
+	if (dev->mtu < IPV6_MIN_MTU)
+		return ERR_PTR(-EINVAL);
+
+	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
+	if (!ndev)
+		return ERR_PTR(err);
+
+	rwlock_init(&ndev->lock);
+	ndev->dev = dev;
+	INIT_LIST_HEAD(&ndev->addr_list);
+	setup_timer(&ndev->rs_timer, addrconf_rs_timer,
+		    (unsigned long)ndev);
+	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
+	ndev->cnf.mtu6 = dev->mtu;
+	ndev->cnf.sysctl = NULL;
+	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
+	if (!ndev->nd_parms) {
+		kfree(ndev);
+		return ERR_PTR(err);
+	}
+	if (ndev->cnf.forwarding)
+		dev_disable_lro(dev);
+	/* We refer to the device */
+	dev_hold(dev);
+
+	if (snmp6_alloc_dev(ndev) < 0) {
+		ADBG(KERN_WARNING
+			"%s: cannot allocate memory for statistics; dev=%s.\n",
+			__func__, dev->name);
+		neigh_parms_release(&nd_tbl, ndev->nd_parms);
+		dev_put(dev);
+		kfree(ndev);
+		return ERR_PTR(err);
+	}
+
+	if (snmp6_register_dev(ndev) < 0) {
+		ADBG(KERN_WARNING
+			"%s: cannot create /proc/net/dev_snmp6/%s\n",
+			__func__, dev->name);
+		goto err_release;
+	}
+
+	/* One reference from device.  We must do this before
+	 * we invoke __ipv6_regen_rndid().
+	 */
+	in6_dev_hold(ndev);
+
+	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
+		ndev->cnf.accept_dad = -1;
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
+		pr_info("%s: Disabled Multicast RS\n", dev->name);
+		ndev->cnf.rtr_solicits = 0;
+	}
+#endif
+
+	INIT_LIST_HEAD(&ndev->tempaddr_list);
+	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
+	if ((dev->flags&IFF_LOOPBACK) ||
+	    dev->type == ARPHRD_TUNNEL ||
+	    dev->type == ARPHRD_TUNNEL6 ||
+	    dev->type == ARPHRD_SIT ||
+	    dev->type == ARPHRD_NONE) {
+		ndev->cnf.use_tempaddr = -1;
+	} else {
+		in6_dev_hold(ndev);
+		ipv6_regen_rndid((unsigned long) ndev);
+	}
+
+	ndev->token = in6addr_any;
+
+	if (netif_running(dev) && addrconf_qdisc_ok(dev))
+		ndev->if_flags |= IF_READY;
+
+	ipv6_mc_init_dev(ndev);
+	ndev->tstamp = jiffies;
+	err = addrconf_sysctl_register(ndev);
+	if (err) {
+		ipv6_mc_destroy_dev(ndev);
+		del_timer(&ndev->regen_timer);
+		goto err_release;
+	}
+	/* protected by rtnl_lock */
+	rcu_assign_pointer(dev->ip6_ptr, ndev);
+
+	/* Join interface-local all-node multicast group */
+	ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
+
+	/* Join all-node multicast group */
+	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
+
+	/* Join all-router multicast group if forwarding is set */
+	if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
+		ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
+
+	return ndev;
+
+err_release:
+	neigh_parms_release(&nd_tbl, ndev->nd_parms);
+	ndev->dead = 1;
+	in6_dev_finish_destroy(ndev);
+	return ERR_PTR(err);
+}
+
+static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
+{
+	struct inet6_dev *idev;
+
+	ASSERT_RTNL();
+
+	idev = __in6_dev_get(dev);
+	if (!idev) {
+		idev = ipv6_add_dev(dev);
+		if (IS_ERR(idev))
+			return NULL;
+	}
+
+	if (dev->flags&IFF_UP)
+		ipv6_mc_up(idev);
+	return idev;
+}
+
+static int inet6_netconf_msgsize_devconf(int type)
+{
+	int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
+		    + nla_total_size(4);	/* NETCONFA_IFINDEX */
+
+	/* type -1 is used for ALL */
+	if (type == -1 || type == NETCONFA_FORWARDING)
+		size += nla_total_size(4);
+#ifdef CONFIG_IPV6_MROUTE
+	if (type == -1 || type == NETCONFA_MC_FORWARDING)
+		size += nla_total_size(4);
+#endif
+	if (type == -1 || type == NETCONFA_PROXY_NEIGH)
+		size += nla_total_size(4);
+
+	return size;
+}
+
+static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
+				      struct ipv6_devconf *devconf, u32 portid,
+				      u32 seq, int event, unsigned int flags,
+				      int type)
+{
+	struct nlmsghdr  *nlh;
+	struct netconfmsg *ncm;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
+			flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	ncm = nlmsg_data(nlh);
+	ncm->ncm_family = AF_INET6;
+
+	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
+		goto nla_put_failure;
+
+	/* type -1 is used for ALL */
+	if ((type == -1 || type == NETCONFA_FORWARDING) &&
+	    nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
+		goto nla_put_failure;
+#ifdef CONFIG_IPV6_MROUTE
+	if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
+	    nla_put_s32(skb, NETCONFA_MC_FORWARDING,
+			devconf->mc_forwarding) < 0)
+		goto nla_put_failure;
+#endif
+	if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
+	    nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
+		goto nla_put_failure;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
+				  struct ipv6_devconf *devconf)
+{
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
+					 RTM_NEWNETCONF, 0, type);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
+	return;
+errout:
+	rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
+}
+
+static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
+	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },
+	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },
+	[NETCONFA_PROXY_NEIGH]	= { .len = sizeof(int) },
+};
+
+static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
+				     struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(in_skb->sk);
+	struct nlattr *tb[NETCONFA_MAX+1];
+	struct netconfmsg *ncm;
+	struct sk_buff *skb;
+	struct ipv6_devconf *devconf;
+	struct inet6_dev *in6_dev;
+	struct net_device *dev;
+	int ifindex;
+	int err;
+
+	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
+			  devconf_ipv6_policy);
+	if (err < 0)
+		goto errout;
+
+	err = EINVAL;
+	if (!tb[NETCONFA_IFINDEX])
+		goto errout;
+
+	ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
+	switch (ifindex) {
+	case NETCONFA_IFINDEX_ALL:
+		devconf = net->ipv6.devconf_all;
+		break;
+	case NETCONFA_IFINDEX_DEFAULT:
+		devconf = net->ipv6.devconf_dflt;
+		break;
+	default:
+		dev = __dev_get_by_index(net, ifindex);
+		if (!dev)
+			goto errout;
+		in6_dev = __in6_dev_get(dev);
+		if (!in6_dev)
+			goto errout;
+		devconf = &in6_dev->cnf;
+		break;
+	}
+
+	err = -ENOBUFS;
+	skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
+					 NETLINK_CB(in_skb).portid,
+					 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
+					 -1);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+	return err;
+}
+
+static int inet6_netconf_dump_devconf(struct sk_buff *skb,
+				      struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	int h, s_h;
+	int idx, s_idx;
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct hlist_head *head;
+
+	s_h = cb->args[0];
+	s_idx = idx = cb->args[1];
+
+	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+		idx = 0;
+		head = &net->dev_index_head[h];
+		rcu_read_lock();
+		cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
+			  net->dev_base_seq;
+		hlist_for_each_entry_rcu(dev, head, index_hlist) {
+			if (idx < s_idx)
+				goto cont;
+			idev = __in6_dev_get(dev);
+			if (!idev)
+				goto cont;
+
+			if (inet6_netconf_fill_devconf(skb, dev->ifindex,
+						       &idev->cnf,
+						       NETLINK_CB(cb->skb).portid,
+						       cb->nlh->nlmsg_seq,
+						       RTM_NEWNETCONF,
+						       NLM_F_MULTI,
+						       -1) < 0) {
+				rcu_read_unlock();
+				goto done;
+			}
+			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+cont:
+			idx++;
+		}
+		rcu_read_unlock();
+	}
+	if (h == NETDEV_HASHENTRIES) {
+		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
+					       net->ipv6.devconf_all,
+					       NETLINK_CB(cb->skb).portid,
+					       cb->nlh->nlmsg_seq,
+					       RTM_NEWNETCONF, NLM_F_MULTI,
+					       -1) < 0)
+			goto done;
+		else
+			h++;
+	}
+	if (h == NETDEV_HASHENTRIES + 1) {
+		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
+					       net->ipv6.devconf_dflt,
+					       NETLINK_CB(cb->skb).portid,
+					       cb->nlh->nlmsg_seq,
+					       RTM_NEWNETCONF, NLM_F_MULTI,
+					       -1) < 0)
+			goto done;
+		else
+			h++;
+	}
+done:
+	cb->args[0] = h;
+	cb->args[1] = idx;
+
+	return skb->len;
+}
+
+#ifdef CONFIG_SYSCTL
+static void dev_forward_change(struct inet6_dev *idev)
+{
+	struct net_device *dev;
+	struct inet6_ifaddr *ifa;
+
+	if (!idev)
+		return;
+	dev = idev->dev;
+	if (idev->cnf.forwarding)
+		dev_disable_lro(dev);
+	if (dev->flags & IFF_MULTICAST) {
+		if (idev->cnf.forwarding) {
+			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
+			ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
+			ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
+		} else {
+			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
+			ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
+			ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
+		}
+	}
+
+	list_for_each_entry(ifa, &idev->addr_list, if_list) {
+		if (ifa->flags&IFA_F_TENTATIVE)
+			continue;
+		if (idev->cnf.forwarding)
+			addrconf_join_anycast(ifa);
+		else
+			addrconf_leave_anycast(ifa);
+	}
+	inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
+				     dev->ifindex, &idev->cnf);
+}
+
+
+static void addrconf_forward_change(struct net *net, __s32 newf)
+{
+	struct net_device *dev;
+	struct inet6_dev *idev;
+
+	for_each_netdev(net, dev) {
+		idev = __in6_dev_get(dev);
+		if (idev) {
+			int changed = (!idev->cnf.forwarding) ^ (!newf);
+			idev->cnf.forwarding = newf;
+			if (changed)
+				dev_forward_change(idev);
+		}
+	}
+}
+
+static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
+{
+	struct net *net;
+	int old;
+
+	if (!rtnl_trylock())
+		return restart_syscall();
+
+	net = (struct net *)table->extra2;
+	old = *p;
+	*p = newf;
+
+	if (p == &net->ipv6.devconf_dflt->forwarding) {
+		if ((!newf) ^ (!old))
+			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
+						     NETCONFA_IFINDEX_DEFAULT,
+						     net->ipv6.devconf_dflt);
+		rtnl_unlock();
+		return 0;
+	}
+
+	if (p == &net->ipv6.devconf_all->forwarding) {
+		net->ipv6.devconf_dflt->forwarding = newf;
+		addrconf_forward_change(net, newf);
+		if ((!newf) ^ (!old))
+			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
+						     NETCONFA_IFINDEX_ALL,
+						     net->ipv6.devconf_all);
+	} else if ((!newf) ^ (!old))
+		dev_forward_change((struct inet6_dev *)table->extra1);
+	rtnl_unlock();
+
+	if (newf)
+		rt6_purge_dflt_routers(net);
+	return 1;
+}
+#endif
+
+/* Nobody refers to this ifaddr, destroy it */
+void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
+{
+	WARN_ON(!hlist_unhashed(&ifp->addr_lst));
+
+#ifdef NET_REFCNT_DEBUG
+	pr_debug("%s\n", __func__);
+#endif
+
+	in6_dev_put(ifp->idev);
+
+	if (cancel_delayed_work(&ifp->dad_work))
+		pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
+			  ifp);
+
+	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
+		pr_warn("Freeing alive inet6 address %p\n", ifp);
+		return;
+	}
+	ip6_rt_put(ifp->rt);
+
+	kfree_rcu(ifp, rcu);
+}
+
+static void
+ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
+{
+	struct list_head *p;
+	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
+
+	/*
+	 * Each device address list is sorted in order of scope -
+	 * global before linklocal.
+	 */
+	list_for_each(p, &idev->addr_list) {
+		struct inet6_ifaddr *ifa
+			= list_entry(p, struct inet6_ifaddr, if_list);
+		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
+			break;
+	}
+
+	list_add_tail(&ifp->if_list, p);
+}
+
+static u32 inet6_addr_hash(const struct in6_addr *addr)
+{
+	return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
+}
+
+/* On success it returns ifp with increased reference count */
+
+static struct inet6_ifaddr *
+ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
+	      const struct in6_addr *peer_addr, int pfxlen,
+	      int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
+{
+	struct inet6_ifaddr *ifa = NULL;
+	struct rt6_info *rt;
+	unsigned int hash;
+	int err = 0;
+	int addr_type = ipv6_addr_type(addr);
+
+	if (addr_type == IPV6_ADDR_ANY ||
+	    addr_type & IPV6_ADDR_MULTICAST ||
+	    (!(idev->dev->flags & IFF_LOOPBACK) &&
+	     addr_type & IPV6_ADDR_LOOPBACK))
+		return ERR_PTR(-EADDRNOTAVAIL);
+
+	rcu_read_lock_bh();
+	if (idev->dead) {
+		err = -ENODEV;			/*XXX*/
+		goto out2;
+	}
+
+	if (idev->cnf.disable_ipv6) {
+		err = -EACCES;
+		goto out2;
+	}
+
+	spin_lock(&addrconf_hash_lock);
+
+	/* Ignore adding duplicate addresses on an interface */
+	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
+		ADBG("ipv6_add_addr: already assigned\n");
+		err = -EEXIST;
+		goto out;
+	}
+
+	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
+
+	if (!ifa) {
+		ADBG("ipv6_add_addr: malloc failed\n");
+		err = -ENOBUFS;
+		goto out;
+	}
+
+	rt = addrconf_dst_alloc(idev, addr, false);
+	if (IS_ERR(rt)) {
+		err = PTR_ERR(rt);
+		goto out;
+	}
+
+	neigh_parms_data_state_setall(idev->nd_parms);
+
+	ifa->addr = *addr;
+	if (peer_addr)
+		ifa->peer_addr = *peer_addr;
+
+	spin_lock_init(&ifa->lock);
+	INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
+	INIT_HLIST_NODE(&ifa->addr_lst);
+	ifa->scope = scope;
+	ifa->prefix_len = pfxlen;
+	ifa->flags = flags | IFA_F_TENTATIVE;
+	ifa->valid_lft = valid_lft;
+	ifa->prefered_lft = prefered_lft;
+	ifa->cstamp = ifa->tstamp = jiffies;
+	ifa->tokenized = false;
+
+	ifa->rt = rt;
+
+	ifa->idev = idev;
+	in6_dev_hold(idev);
+	/* For caller */
+	in6_ifa_hold(ifa);
+
+	/* Add to big hash table */
+	hash = inet6_addr_hash(addr);
+
+	hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
+	spin_unlock(&addrconf_hash_lock);
+
+	write_lock(&idev->lock);
+	/* Add to inet6_dev unicast addr list. */
+	ipv6_link_dev_addr(idev, ifa);
+
+	if (ifa->flags&IFA_F_TEMPORARY) {
+		list_add(&ifa->tmp_list, &idev->tempaddr_list);
+		in6_ifa_hold(ifa);
+	}
+
+	in6_ifa_hold(ifa);
+	write_unlock(&idev->lock);
+out2:
+	rcu_read_unlock_bh();
+
+	if (likely(err == 0))
+		inet6addr_notifier_call_chain(NETDEV_UP, ifa);
+	else {
+		kfree(ifa);
+		ifa = ERR_PTR(err);
+	}
+
+	return ifa;
+out:
+	spin_unlock(&addrconf_hash_lock);
+	goto out2;
+}
+
+enum cleanup_prefix_rt_t {
+	CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
+	CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
+	CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
+};
+
+/*
+ * Check, whether the prefix for ifp would still need a prefix route
+ * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
+ * constants.
+ *
+ * 1) we don't purge prefix if address was not permanent.
+ *    prefix is managed by its own lifetime.
+ * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
+ * 3) if there are no addresses, delete prefix.
+ * 4) if there are still other permanent address(es),
+ *    corresponding prefix is still permanent.
+ * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
+ *    don't purge the prefix, assume user space is managing it.
+ * 6) otherwise, update prefix lifetime to the
+ *    longest valid lifetime among the corresponding
+ *    addresses on the device.
+ *    Note: subsequent RA will update lifetime.
+ **/
+static enum cleanup_prefix_rt_t
+check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
+{
+	struct inet6_ifaddr *ifa;
+	struct inet6_dev *idev = ifp->idev;
+	unsigned long lifetime;
+	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
+
+	*expires = jiffies;
+
+	list_for_each_entry(ifa, &idev->addr_list, if_list) {
+		if (ifa == ifp)
+			continue;
+		if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
+				       ifp->prefix_len))
+			continue;
+		if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
+			return CLEANUP_PREFIX_RT_NOP;
+
+		action = CLEANUP_PREFIX_RT_EXPIRE;
+
+		spin_lock(&ifa->lock);
+
+		lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
+		/*
+		 * Note: Because this address is
+		 * not permanent, lifetime <
+		 * LONG_MAX / HZ here.
+		 */
+		if (time_before(*expires, ifa->tstamp + lifetime * HZ))
+			*expires = ifa->tstamp + lifetime * HZ;
+		spin_unlock(&ifa->lock);
+	}
+
+	return action;
+}
+
+static void
+cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
+{
+	struct rt6_info *rt;
+
+	rt = addrconf_get_prefix_route(&ifp->addr,
+				       ifp->prefix_len,
+				       ifp->idev->dev,
+				       0, RTF_GATEWAY | RTF_DEFAULT);
+	if (rt) {
+		if (del_rt)
+			ip6_del_rt(rt);
+		else {
+			if (!(rt->rt6i_flags & RTF_EXPIRES))
+				rt6_set_expires(rt, expires);
+			ip6_rt_put(rt);
+		}
+	}
+}
+
+
+/* This function wants to get referenced ifp and releases it before return */
+
+static void ipv6_del_addr(struct inet6_ifaddr *ifp)
+{
+	int state;
+	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
+	unsigned long expires;
+
+	ASSERT_RTNL();
+
+	spin_lock_bh(&ifp->lock);
+	state = ifp->state;
+	ifp->state = INET6_IFADDR_STATE_DEAD;
+	spin_unlock_bh(&ifp->lock);
+
+	if (state == INET6_IFADDR_STATE_DEAD)
+		goto out;
+
+	spin_lock_bh(&addrconf_hash_lock);
+	hlist_del_init_rcu(&ifp->addr_lst);
+	spin_unlock_bh(&addrconf_hash_lock);
+
+	write_lock_bh(&ifp->idev->lock);
+
+	if (ifp->flags&IFA_F_TEMPORARY) {
+		list_del(&ifp->tmp_list);
+		if (ifp->ifpub) {
+			in6_ifa_put(ifp->ifpub);
+			ifp->ifpub = NULL;
+		}
+		__in6_ifa_put(ifp);
+	}
+
+	if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
+		action = check_cleanup_prefix_route(ifp, &expires);
+
+	list_del_init(&ifp->if_list);
+	__in6_ifa_put(ifp);
+
+	write_unlock_bh(&ifp->idev->lock);
+
+	addrconf_del_dad_work(ifp);
+
+	ipv6_ifa_notify(RTM_DELADDR, ifp);
+
+	inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
+
+	if (action != CLEANUP_PREFIX_RT_NOP) {
+		cleanup_prefix_route(ifp, expires,
+			action == CLEANUP_PREFIX_RT_DEL);
+	}
+
+	/* clean up prefsrc entries */
+	rt6_remove_prefsrc(ifp);
+out:
+	in6_ifa_put(ifp);
+}
+
+static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
+{
+	struct inet6_dev *idev = ifp->idev;
+	struct in6_addr addr, *tmpaddr;
+	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
+	unsigned long regen_advance;
+	int tmp_plen;
+	int ret = 0;
+	u32 addr_flags;
+	unsigned long now = jiffies;
+
+	write_lock_bh(&idev->lock);
+	if (ift) {
+		spin_lock_bh(&ift->lock);
+		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
+		spin_unlock_bh(&ift->lock);
+		tmpaddr = &addr;
+	} else {
+		tmpaddr = NULL;
+	}
+retry:
+	in6_dev_hold(idev);
+	if (idev->cnf.use_tempaddr <= 0) {
+		write_unlock_bh(&idev->lock);
+		pr_info("%s: use_tempaddr is disabled\n", __func__);
+		in6_dev_put(idev);
+		ret = -1;
+		goto out;
+	}
+	spin_lock_bh(&ifp->lock);
+	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
+		idev->cnf.use_tempaddr = -1;	/*XXX*/
+		spin_unlock_bh(&ifp->lock);
+		write_unlock_bh(&idev->lock);
+		pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
+			__func__);
+		in6_dev_put(idev);
+		ret = -1;
+		goto out;
+	}
+	in6_ifa_hold(ifp);
+	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
+	__ipv6_try_regen_rndid(idev, tmpaddr);
+	memcpy(&addr.s6_addr[8], idev->rndid, 8);
+	age = (now - ifp->tstamp) / HZ;
+	tmp_valid_lft = min_t(__u32,
+			      ifp->valid_lft,
+			      idev->cnf.temp_valid_lft + age);
+	tmp_prefered_lft = min_t(__u32,
+				 ifp->prefered_lft,
+				 idev->cnf.temp_prefered_lft + age -
+				 idev->cnf.max_desync_factor);
+	tmp_plen = ifp->prefix_len;
+	tmp_tstamp = ifp->tstamp;
+	spin_unlock_bh(&ifp->lock);
+
+	regen_advance = idev->cnf.regen_max_retry *
+			idev->cnf.dad_transmits *
+			NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
+	write_unlock_bh(&idev->lock);
+
+	/* A temporary address is created only if this calculated Preferred
+	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
+	 * an implementation must not create a temporary address with a zero
+	 * Preferred Lifetime.
+	 * Use age calculation as in addrconf_verify to avoid unnecessary
+	 * temporary addresses being generated.
+	 */
+	age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+	if (tmp_prefered_lft <= regen_advance + age) {
+		in6_ifa_put(ifp);
+		in6_dev_put(idev);
+		ret = -1;
+		goto out;
+	}
+
+	addr_flags = IFA_F_TEMPORARY;
+	/* set in addrconf_prefix_rcv() */
+	if (ifp->flags & IFA_F_OPTIMISTIC)
+		addr_flags |= IFA_F_OPTIMISTIC;
+
+	ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
+			    ipv6_addr_scope(&addr), addr_flags,
+			    tmp_valid_lft, tmp_prefered_lft);
+	if (IS_ERR(ift)) {
+		in6_ifa_put(ifp);
+		in6_dev_put(idev);
+		pr_info("%s: retry temporary address regeneration\n", __func__);
+		tmpaddr = &addr;
+		write_lock_bh(&idev->lock);
+		goto retry;
+	}
+
+	spin_lock_bh(&ift->lock);
+	ift->ifpub = ifp;
+	ift->cstamp = now;
+	ift->tstamp = tmp_tstamp;
+	spin_unlock_bh(&ift->lock);
+
+	addrconf_dad_start(ift);
+	in6_ifa_put(ift);
+	in6_dev_put(idev);
+out:
+	return ret;
+}
+
+/*
+ *	Choose an appropriate source address (RFC3484)
+ */
+enum {
+	IPV6_SADDR_RULE_INIT = 0,
+	IPV6_SADDR_RULE_LOCAL,
+	IPV6_SADDR_RULE_SCOPE,
+	IPV6_SADDR_RULE_PREFERRED,
+#ifdef CONFIG_IPV6_MIP6
+	IPV6_SADDR_RULE_HOA,
+#endif
+	IPV6_SADDR_RULE_OIF,
+	IPV6_SADDR_RULE_LABEL,
+	IPV6_SADDR_RULE_PRIVACY,
+	IPV6_SADDR_RULE_ORCHID,
+	IPV6_SADDR_RULE_PREFIX,
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	IPV6_SADDR_RULE_NOT_OPTIMISTIC,
+#endif
+	IPV6_SADDR_RULE_MAX
+};
+
+struct ipv6_saddr_score {
+	int			rule;
+	int			addr_type;
+	struct inet6_ifaddr	*ifa;
+	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
+	int			scopedist;
+	int			matchlen;
+};
+
+struct ipv6_saddr_dst {
+	const struct in6_addr *addr;
+	int ifindex;
+	int scope;
+	int label;
+	unsigned int prefs;
+};
+
+static inline int ipv6_saddr_preferred(int type)
+{
+	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
+		return 1;
+	return 0;
+}
+
+static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
+{
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
+#else
+	return false;
+#endif
+}
+
+static int ipv6_get_saddr_eval(struct net *net,
+			       struct ipv6_saddr_score *score,
+			       struct ipv6_saddr_dst *dst,
+			       int i)
+{
+	int ret;
+
+	if (i <= score->rule) {
+		switch (i) {
+		case IPV6_SADDR_RULE_SCOPE:
+			ret = score->scopedist;
+			break;
+		case IPV6_SADDR_RULE_PREFIX:
+			ret = score->matchlen;
+			break;
+		default:
+			ret = !!test_bit(i, score->scorebits);
+		}
+		goto out;
+	}
+
+	switch (i) {
+	case IPV6_SADDR_RULE_INIT:
+		/* Rule 0: remember if hiscore is not ready yet */
+		ret = !!score->ifa;
+		break;
+	case IPV6_SADDR_RULE_LOCAL:
+		/* Rule 1: Prefer same address */
+		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
+		break;
+	case IPV6_SADDR_RULE_SCOPE:
+		/* Rule 2: Prefer appropriate scope
+		 *
+		 *      ret
+		 *       ^
+		 *    -1 |  d 15
+		 *    ---+--+-+---> scope
+		 *       |
+		 *       |             d is scope of the destination.
+		 *  B-d  |  \
+		 *       |   \      <- smaller scope is better if
+		 *  B-15 |    \        if scope is enough for destination.
+		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
+		 * d-C-1 | /
+		 *       |/         <- greater is better
+		 *   -C  /             if scope is not enough for destination.
+		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
+		 *
+		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
+		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
+		 * Assume B = 0 and we get C > 29.
+		 */
+		ret = __ipv6_addr_src_scope(score->addr_type);
+		if (ret >= dst->scope)
+			ret = -ret;
+		else
+			ret -= 128;	/* 30 is enough */
+		score->scopedist = ret;
+		break;
+	case IPV6_SADDR_RULE_PREFERRED:
+	    {
+		/* Rule 3: Avoid deprecated and optimistic addresses */
+		u8 avoid = IFA_F_DEPRECATED;
+
+		if (!ipv6_use_optimistic_addr(score->ifa->idev))
+			avoid |= IFA_F_OPTIMISTIC;
+		ret = ipv6_saddr_preferred(score->addr_type) ||
+		      !(score->ifa->flags & avoid);
+		break;
+	    }
+#ifdef CONFIG_IPV6_MIP6
+	case IPV6_SADDR_RULE_HOA:
+	    {
+		/* Rule 4: Prefer home address */
+		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
+		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
+		break;
+	    }
+#endif
+	case IPV6_SADDR_RULE_OIF:
+		/* Rule 5: Prefer outgoing interface */
+		ret = (!dst->ifindex ||
+		       dst->ifindex == score->ifa->idev->dev->ifindex);
+		break;
+	case IPV6_SADDR_RULE_LABEL:
+		/* Rule 6: Prefer matching label */
+		ret = ipv6_addr_label(net,
+				      &score->ifa->addr, score->addr_type,
+				      score->ifa->idev->dev->ifindex) == dst->label;
+		break;
+	case IPV6_SADDR_RULE_PRIVACY:
+	    {
+		/* Rule 7: Prefer public address
+		 * Note: prefer temporary address if use_tempaddr >= 2
+		 */
+		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
+				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
+				score->ifa->idev->cnf.use_tempaddr >= 2;
+		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
+		break;
+	    }
+	case IPV6_SADDR_RULE_ORCHID:
+		/* Rule 8-: Prefer ORCHID vs ORCHID or
+		 *	    non-ORCHID vs non-ORCHID
+		 */
+		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
+			ipv6_addr_orchid(dst->addr));
+		break;
+	case IPV6_SADDR_RULE_PREFIX:
+		/* Rule 8: Use longest matching prefix */
+		ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
+		if (ret > score->ifa->prefix_len)
+			ret = score->ifa->prefix_len;
+		score->matchlen = ret;
+		break;
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
+		/* Optimistic addresses still have lower precedence than other
+		 * preferred addresses.
+		 */
+		ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
+		break;
+#endif
+	default:
+		ret = 0;
+	}
+
+	if (ret)
+		__set_bit(i, score->scorebits);
+	score->rule = i;
+out:
+	return ret;
+}
+
+int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
+		       const struct in6_addr *daddr, unsigned int prefs,
+		       struct in6_addr *saddr)
+{
+	struct ipv6_saddr_score scores[2],
+				*score = &scores[0], *hiscore = &scores[1];
+	struct ipv6_saddr_dst dst;
+	struct net_device *dev;
+	int dst_type;
+
+	dst_type = __ipv6_addr_type(daddr);
+	dst.addr = daddr;
+	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
+	dst.scope = __ipv6_addr_src_scope(dst_type);
+	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
+	dst.prefs = prefs;
+
+	hiscore->rule = -1;
+	hiscore->ifa = NULL;
+
+	rcu_read_lock();
+
+	for_each_netdev_rcu(net, dev) {
+		struct inet6_dev *idev;
+
+		/* Candidate Source Address (section 4)
+		 *  - multicast and link-local destination address,
+		 *    the set of candidate source address MUST only
+		 *    include addresses assigned to interfaces
+		 *    belonging to the same link as the outgoing
+		 *    interface.
+		 * (- For site-local destination addresses, the
+		 *    set of candidate source addresses MUST only
+		 *    include addresses assigned to interfaces
+		 *    belonging to the same site as the outgoing
+		 *    interface.)
+		 */
+		if (((dst_type & IPV6_ADDR_MULTICAST) ||
+		     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
+		    dst.ifindex && dev->ifindex != dst.ifindex)
+			continue;
+
+		idev = __in6_dev_get(dev);
+		if (!idev)
+			continue;
+
+		read_lock_bh(&idev->lock);
+		list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
+			int i;
+
+			/*
+			 * - Tentative Address (RFC2462 section 5.4)
+			 *  - A tentative address is not considered
+			 *    "assigned to an interface" in the traditional
+			 *    sense, unless it is also flagged as optimistic.
+			 * - Candidate Source Address (section 4)
+			 *  - In any case, anycast addresses, multicast
+			 *    addresses, and the unspecified address MUST
+			 *    NOT be included in a candidate set.
+			 */
+			if ((score->ifa->flags & IFA_F_TENTATIVE) &&
+			    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
+				continue;
+
+			score->addr_type = __ipv6_addr_type(&score->ifa->addr);
+
+			if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
+				     score->addr_type & IPV6_ADDR_MULTICAST)) {
+				net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
+						    dev->name);
+				continue;
+			}
+
+			score->rule = -1;
+			bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
+
+			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
+				int minihiscore, miniscore;
+
+				minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
+				miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
+
+				if (minihiscore > miniscore) {
+					if (i == IPV6_SADDR_RULE_SCOPE &&
+					    score->scopedist > 0) {
+						/*
+						 * special case:
+						 * each remaining entry
+						 * has too small (not enough)
+						 * scope, because ifa entries
+						 * are sorted by their scope
+						 * values.
+						 */
+						goto try_nextdev;
+					}
+					break;
+				} else if (minihiscore < miniscore) {
+					if (hiscore->ifa)
+						in6_ifa_put(hiscore->ifa);
+
+					in6_ifa_hold(score->ifa);
+
+					swap(hiscore, score);
+
+					/* restore our iterator */
+					score->ifa = hiscore->ifa;
+
+					break;
+				}
+			}
+		}
+try_nextdev:
+		read_unlock_bh(&idev->lock);
+	}
+	rcu_read_unlock();
+
+	if (!hiscore->ifa)
+		return -EADDRNOTAVAIL;
+
+	*saddr = hiscore->ifa->addr;
+	in6_ifa_put(hiscore->ifa);
+	return 0;
+}
+EXPORT_SYMBOL(ipv6_dev_get_saddr);
+
+int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
+		      u32 banned_flags)
+{
+	struct inet6_ifaddr *ifp;
+	int err = -EADDRNOTAVAIL;
+
+	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+		if (ifp->scope > IFA_LINK)
+			break;
+		if (ifp->scope == IFA_LINK &&
+		    !(ifp->flags & banned_flags)) {
+			*addr = ifp->addr;
+			err = 0;
+			break;
+		}
+	}
+	return err;
+}
+
+int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
+		    u32 banned_flags)
+{
+	struct inet6_dev *idev;
+	int err = -EADDRNOTAVAIL;
+
+	rcu_read_lock();
+	idev = __in6_dev_get(dev);
+	if (idev) {
+		read_lock_bh(&idev->lock);
+		err = __ipv6_get_lladdr(idev, addr, banned_flags);
+		read_unlock_bh(&idev->lock);
+	}
+	rcu_read_unlock();
+	return err;
+}
+
+static int ipv6_count_addresses(struct inet6_dev *idev)
+{
+	int cnt = 0;
+	struct inet6_ifaddr *ifp;
+
+	read_lock_bh(&idev->lock);
+	list_for_each_entry(ifp, &idev->addr_list, if_list)
+		cnt++;
+	read_unlock_bh(&idev->lock);
+	return cnt;
+}
+
+int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
+		  const struct net_device *dev, int strict)
+{
+	return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
+}
+EXPORT_SYMBOL(ipv6_chk_addr);
+
+int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
+			    const struct net_device *dev, int strict,
+			    u32 banned_flags)
+{
+	struct inet6_ifaddr *ifp;
+	unsigned int hash = inet6_addr_hash(addr);
+	u32 ifp_flags;
+
+	rcu_read_lock_bh();
+	hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
+		if (!net_eq(dev_net(ifp->idev->dev), net))
+			continue;
+		/* Decouple optimistic from tentative for evaluation here.
+		 * Ban optimistic addresses explicitly, when required.
+		 */
+		ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
+			    ? (ifp->flags&~IFA_F_TENTATIVE)
+			    : ifp->flags;
+		if (ipv6_addr_equal(&ifp->addr, addr) &&
+		    !(ifp_flags&banned_flags) &&
+		    (!dev || ifp->idev->dev == dev ||
+		     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
+			rcu_read_unlock_bh();
+			return 1;
+		}
+	}
+
+	rcu_read_unlock_bh();
+	return 0;
+}
+EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
+
+static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
+			       struct net_device *dev)
+{
+	unsigned int hash = inet6_addr_hash(addr);
+	struct inet6_ifaddr *ifp;
+
+	hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
+		if (!net_eq(dev_net(ifp->idev->dev), net))
+			continue;
+		if (ipv6_addr_equal(&ifp->addr, addr)) {
+			if (!dev || ifp->idev->dev == dev)
+				return true;
+		}
+	}
+	return false;
+}
+
+/* Compares an address/prefix_len with addresses on device @dev.
+ * If one is found it returns true.
+ */
+bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
+	const unsigned int prefix_len, struct net_device *dev)
+{
+	struct inet6_dev *idev;
+	struct inet6_ifaddr *ifa;
+	bool ret = false;
+
+	rcu_read_lock();
+	idev = __in6_dev_get(dev);
+	if (idev) {
+		read_lock_bh(&idev->lock);
+		list_for_each_entry(ifa, &idev->addr_list, if_list) {
+			ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
+			if (ret)
+				break;
+		}
+		read_unlock_bh(&idev->lock);
+	}
+	rcu_read_unlock();
+
+	return ret;
+}
+EXPORT_SYMBOL(ipv6_chk_custom_prefix);
+
+int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
+{
+	struct inet6_dev *idev;
+	struct inet6_ifaddr *ifa;
+	int	onlink;
+
+	onlink = 0;
+	rcu_read_lock();
+	idev = __in6_dev_get(dev);
+	if (idev) {
+		read_lock_bh(&idev->lock);
+		list_for_each_entry(ifa, &idev->addr_list, if_list) {
+			onlink = ipv6_prefix_equal(addr, &ifa->addr,
+						   ifa->prefix_len);
+			if (onlink)
+				break;
+		}
+		read_unlock_bh(&idev->lock);
+	}
+	rcu_read_unlock();
+	return onlink;
+}
+EXPORT_SYMBOL(ipv6_chk_prefix);
+
+struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
+				     struct net_device *dev, int strict)
+{
+	struct inet6_ifaddr *ifp, *result = NULL;
+	unsigned int hash = inet6_addr_hash(addr);
+
+	rcu_read_lock_bh();
+	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
+		if (!net_eq(dev_net(ifp->idev->dev), net))
+			continue;
+		if (ipv6_addr_equal(&ifp->addr, addr)) {
+			if (!dev || ifp->idev->dev == dev ||
+			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
+				result = ifp;
+				in6_ifa_hold(ifp);
+				break;
+			}
+		}
+	}
+	rcu_read_unlock_bh();
+
+	return result;
+}
+
+/* Gets referenced address, destroys ifaddr */
+
+static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
+{
+	if (ifp->flags&IFA_F_PERMANENT) {
+		spin_lock_bh(&ifp->lock);
+		addrconf_del_dad_work(ifp);
+		ifp->flags |= IFA_F_TENTATIVE;
+		if (dad_failed)
+			ifp->flags |= IFA_F_DADFAILED;
+		spin_unlock_bh(&ifp->lock);
+		if (dad_failed)
+			ipv6_ifa_notify(0, ifp);
+		in6_ifa_put(ifp);
+	} else if (ifp->flags&IFA_F_TEMPORARY) {
+		struct inet6_ifaddr *ifpub;
+		spin_lock_bh(&ifp->lock);
+		ifpub = ifp->ifpub;
+		if (ifpub) {
+			in6_ifa_hold(ifpub);
+			spin_unlock_bh(&ifp->lock);
+			ipv6_create_tempaddr(ifpub, ifp);
+			in6_ifa_put(ifpub);
+		} else {
+			spin_unlock_bh(&ifp->lock);
+		}
+		ipv6_del_addr(ifp);
+	} else {
+		ipv6_del_addr(ifp);
+	}
+}
+
+static int addrconf_dad_end(struct inet6_ifaddr *ifp)
+{
+	int err = -ENOENT;
+
+	spin_lock_bh(&ifp->lock);
+	if (ifp->state == INET6_IFADDR_STATE_DAD) {
+		ifp->state = INET6_IFADDR_STATE_POSTDAD;
+		err = 0;
+	}
+	spin_unlock_bh(&ifp->lock);
+
+	return err;
+}
+
+void addrconf_dad_failure(struct inet6_ifaddr *ifp)
+{
+	struct in6_addr addr;
+	struct inet6_dev *idev = ifp->idev;
+	struct net *net = dev_net(ifp->idev->dev);
+
+	if (addrconf_dad_end(ifp)) {
+		in6_ifa_put(ifp);
+		return;
+	}
+
+	net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
+			     ifp->idev->dev->name, &ifp->addr);
+
+	spin_lock_bh(&ifp->lock);
+
+	if (ifp->flags & IFA_F_STABLE_PRIVACY) {
+		int scope = ifp->scope;
+		u32 flags = ifp->flags;
+		struct in6_addr new_addr;
+		struct inet6_ifaddr *ifp2;
+		u32 valid_lft, preferred_lft;
+		int pfxlen = ifp->prefix_len;
+		int retries = ifp->stable_privacy_retry + 1;
+
+		if (retries > net->ipv6.sysctl.idgen_retries) {
+			net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
+					     ifp->idev->dev->name);
+			goto errdad;
+		}
+
+		new_addr = ifp->addr;
+		if (ipv6_generate_stable_address(&new_addr, retries,
+						 idev))
+			goto errdad;
+
+		valid_lft = ifp->valid_lft;
+		preferred_lft = ifp->prefered_lft;
+
+		spin_unlock_bh(&ifp->lock);
+
+		if (idev->cnf.max_addresses &&
+		    ipv6_count_addresses(idev) >=
+		    idev->cnf.max_addresses)
+			goto lock_errdad;
+
+		net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
+				     ifp->idev->dev->name);
+
+		ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
+				     scope, flags, valid_lft,
+				     preferred_lft);
+		if (IS_ERR(ifp2))
+			goto lock_errdad;
+
+		spin_lock_bh(&ifp2->lock);
+		ifp2->stable_privacy_retry = retries;
+		ifp2->state = INET6_IFADDR_STATE_PREDAD;
+		spin_unlock_bh(&ifp2->lock);
+
+		addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
+		in6_ifa_put(ifp2);
+lock_errdad:
+		spin_lock_bh(&ifp->lock);
+	} else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
+		addr.s6_addr32[0] = htonl(0xfe800000);
+		addr.s6_addr32[1] = 0;
+
+		if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
+		    ipv6_addr_equal(&ifp->addr, &addr)) {
+			/* DAD failed for link-local based on MAC address */
+			idev->cnf.disable_ipv6 = 1;
+
+			pr_info("%s: IPv6 being disabled!\n",
+				ifp->idev->dev->name);
+		}
+	}
+
+errdad:
+	/* transition from _POSTDAD to _ERRDAD */
+	ifp->state = INET6_IFADDR_STATE_ERRDAD;
+	spin_unlock_bh(&ifp->lock);
+
+	addrconf_mod_dad_work(ifp, 0);
+}
+
+/* Join to solicited addr multicast group.
+ * caller must hold RTNL */
+void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
+{
+	struct in6_addr maddr;
+
+	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
+		return;
+
+	addrconf_addr_solict_mult(addr, &maddr);
+	ipv6_dev_mc_inc(dev, &maddr);
+}
+
+/* caller must hold RTNL */
+void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
+{
+	struct in6_addr maddr;
+
+	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
+		return;
+
+	addrconf_addr_solict_mult(addr, &maddr);
+	__ipv6_dev_mc_dec(idev, &maddr);
+}
+
+/* caller must hold RTNL */
+static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
+{
+	struct in6_addr addr;
+
+	if (ifp->prefix_len >= 127) /* RFC 6164 */
+		return;
+	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
+	if (ipv6_addr_any(&addr))
+		return;
+	__ipv6_dev_ac_inc(ifp->idev, &addr);
+}
+
+/* caller must hold RTNL */
+static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
+{
+	struct in6_addr addr;
+
+	if (ifp->prefix_len >= 127) /* RFC 6164 */
+		return;
+	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
+	if (ipv6_addr_any(&addr))
+		return;
+	__ipv6_dev_ac_dec(ifp->idev, &addr);
+}
+
+static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
+{
+	if (dev->addr_len != ETH_ALEN)
+		return -1;
+	memcpy(eui, dev->dev_addr, 3);
+	memcpy(eui + 5, dev->dev_addr + 3, 3);
+
+	/*
+	 * The zSeries OSA network cards can be shared among various
+	 * OS instances, but the OSA cards have only one MAC address.
+	 * This leads to duplicate address conflicts in conjunction
+	 * with IPv6 if more than one instance uses the same card.
+	 *
+	 * The driver for these cards can deliver a unique 16-bit
+	 * identifier for each instance sharing the same card.  It is
+	 * placed instead of 0xFFFE in the interface identifier.  The
+	 * "u" bit of the interface identifier is not inverted in this
+	 * case.  Hence the resulting interface identifier has local
+	 * scope according to RFC2373.
+	 */
+	if (dev->dev_id) {
+		eui[3] = (dev->dev_id >> 8) & 0xFF;
+		eui[4] = dev->dev_id & 0xFF;
+	} else {
+		eui[3] = 0xFF;
+		eui[4] = 0xFE;
+		eui[0] ^= 2;
+	}
+	return 0;
+}
+
+static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
+{
+	if (dev->addr_len != IEEE802154_ADDR_LEN)
+		return -1;
+	memcpy(eui, dev->dev_addr, 8);
+	eui[0] ^= 2;
+	return 0;
+}
+
+static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
+{
+	union fwnet_hwaddr *ha;
+
+	if (dev->addr_len != FWNET_ALEN)
+		return -1;
+
+	ha = (union fwnet_hwaddr *)dev->dev_addr;
+
+	memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
+	eui[0] ^= 2;
+	return 0;
+}
+
+static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
+{
+	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
+	if (dev->addr_len != ARCNET_ALEN)
+		return -1;
+	memset(eui, 0, 7);
+	eui[7] = *(u8 *)dev->dev_addr;
+	return 0;
+}
+
+static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
+{
+	if (dev->addr_len != INFINIBAND_ALEN)
+		return -1;
+	memcpy(eui, dev->dev_addr + 12, 8);
+	eui[0] |= 2;
+	return 0;
+}
+
+static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
+{
+	if (addr == 0)
+		return -1;
+	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
+		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
+		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
+		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
+		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
+		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
+	eui[1] = 0;
+	eui[2] = 0x5E;
+	eui[3] = 0xFE;
+	memcpy(eui + 4, &addr, 4);
+	return 0;
+}
+
+static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
+{
+	if (dev->priv_flags & IFF_ISATAP)
+		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+	return -1;
+}
+
+static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
+{
+	return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+}
+
+static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
+{
+	memcpy(eui, dev->perm_addr, 3);
+	memcpy(eui + 5, dev->perm_addr + 3, 3);
+	eui[3] = 0xFF;
+	eui[4] = 0xFE;
+	eui[0] ^= 2;
+	return 0;
+}
+
+static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
+{
+	switch (dev->type) {
+	case ARPHRD_ETHER:
+	case ARPHRD_FDDI:
+		return addrconf_ifid_eui48(eui, dev);
+	case ARPHRD_ARCNET:
+		return addrconf_ifid_arcnet(eui, dev);
+	case ARPHRD_INFINIBAND:
+		return addrconf_ifid_infiniband(eui, dev);
+	case ARPHRD_SIT:
+		return addrconf_ifid_sit(eui, dev);
+	case ARPHRD_IPGRE:
+		return addrconf_ifid_gre(eui, dev);
+	case ARPHRD_6LOWPAN:
+	case ARPHRD_IEEE802154:
+		return addrconf_ifid_eui64(eui, dev);
+	case ARPHRD_IEEE1394:
+		return addrconf_ifid_ieee1394(eui, dev);
+	case ARPHRD_TUNNEL6:
+		return addrconf_ifid_ip6tnl(eui, dev);
+	}
+	return -1;
+}
+
+static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
+{
+	int err = -1;
+	struct inet6_ifaddr *ifp;
+
+	read_lock_bh(&idev->lock);
+	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+		if (ifp->scope > IFA_LINK)
+			break;
+		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
+			memcpy(eui, ifp->addr.s6_addr+8, 8);
+			err = 0;
+			break;
+		}
+	}
+	read_unlock_bh(&idev->lock);
+	return err;
+}
+
+/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
+static void __ipv6_regen_rndid(struct inet6_dev *idev)
+{
+regen:
+	get_random_bytes(idev->rndid, sizeof(idev->rndid));
+	idev->rndid[0] &= ~0x02;
+
+	/*
+	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
+	 * check if generated address is not inappropriate
+	 *
+	 *  - Reserved subnet anycast (RFC 2526)
+	 *	11111101 11....11 1xxxxxxx
+	 *  - ISATAP (RFC4214) 6.1
+	 *	00-00-5E-FE-xx-xx-xx-xx
+	 *  - value 0
+	 *  - XXX: already assigned to an address on the device
+	 */
+	if (idev->rndid[0] == 0xfd &&
+	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
+	    (idev->rndid[7]&0x80))
+		goto regen;
+	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
+		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
+			goto regen;
+		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
+			goto regen;
+	}
+}
+
+static void ipv6_regen_rndid(unsigned long data)
+{
+	struct inet6_dev *idev = (struct inet6_dev *) data;
+	unsigned long expires;
+
+	rcu_read_lock_bh();
+	write_lock_bh(&idev->lock);
+
+	if (idev->dead)
+		goto out;
+
+	__ipv6_regen_rndid(idev);
+
+	expires = jiffies +
+		idev->cnf.temp_prefered_lft * HZ -
+		idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
+		NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
+		idev->cnf.max_desync_factor * HZ;
+	if (time_before(expires, jiffies)) {
+		pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
+			__func__, idev->dev->name);
+		goto out;
+	}
+
+	if (!mod_timer(&idev->regen_timer, expires))
+		in6_dev_hold(idev);
+
+out:
+	write_unlock_bh(&idev->lock);
+	rcu_read_unlock_bh();
+	in6_dev_put(idev);
+}
+
+static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
+{
+	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
+		__ipv6_regen_rndid(idev);
+}
+
+/*
+ *	Add prefix route.
+ */
+
+static void
+addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
+		      unsigned long expires, u32 flags)
+{
+	struct fib6_config cfg = {
+		.fc_table = RT6_TABLE_PREFIX,
+		.fc_metric = IP6_RT_PRIO_ADDRCONF,
+		.fc_ifindex = dev->ifindex,
+		.fc_expires = expires,
+		.fc_dst_len = plen,
+		.fc_flags = RTF_UP | flags,
+		.fc_nlinfo.nl_net = dev_net(dev),
+		.fc_protocol = RTPROT_KERNEL,
+	};
+
+	cfg.fc_dst = *pfx;
+
+	/* Prevent useless cloning on PtP SIT.
+	   This thing is done here expecting that the whole
+	   class of non-broadcast devices need not cloning.
+	 */
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
+		cfg.fc_flags |= RTF_NONEXTHOP;
+#endif
+
+	ip6_route_add(&cfg);
+}
+
+
+static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+						  int plen,
+						  const struct net_device *dev,
+						  u32 flags, u32 noflags)
+{
+	struct fib6_node *fn;
+	struct rt6_info *rt = NULL;
+	struct fib6_table *table;
+
+	table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
+	if (!table)
+		return NULL;
+
+	read_lock_bh(&table->tb6_lock);
+	fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
+	if (!fn)
+		goto out;
+	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
+		if (rt->dst.dev->ifindex != dev->ifindex)
+			continue;
+		if ((rt->rt6i_flags & flags) != flags)
+			continue;
+		if ((rt->rt6i_flags & noflags) != 0)
+			continue;
+		dst_hold(&rt->dst);
+		break;
+	}
+out:
+	read_unlock_bh(&table->tb6_lock);
+	return rt;
+}
+
+
+/* Create "default" multicast route to the interface */
+
+static void addrconf_add_mroute(struct net_device *dev)
+{
+	struct fib6_config cfg = {
+		.fc_table = RT6_TABLE_LOCAL,
+		.fc_metric = IP6_RT_PRIO_ADDRCONF,
+		.fc_ifindex = dev->ifindex,
+		.fc_dst_len = 8,
+		.fc_flags = RTF_UP,
+		.fc_nlinfo.nl_net = dev_net(dev),
+	};
+
+	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
+
+	ip6_route_add(&cfg);
+}
+
+static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
+{
+	struct inet6_dev *idev;
+
+	ASSERT_RTNL();
+
+	idev = ipv6_find_idev(dev);
+	if (!idev)
+		return ERR_PTR(-ENOBUFS);
+
+	if (idev->cnf.disable_ipv6)
+		return ERR_PTR(-EACCES);
+
+	/* Add default multicast route */
+	if (!(dev->flags & IFF_LOOPBACK))
+		addrconf_add_mroute(dev);
+
+	return idev;
+}
+
+static void manage_tempaddrs(struct inet6_dev *idev,
+			     struct inet6_ifaddr *ifp,
+			     __u32 valid_lft, __u32 prefered_lft,
+			     bool create, unsigned long now)
+{
+	u32 flags;
+	struct inet6_ifaddr *ift;
+
+	read_lock_bh(&idev->lock);
+	/* update all temporary addresses in the list */
+	list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
+		int age, max_valid, max_prefered;
+
+		if (ifp != ift->ifpub)
+			continue;
+
+		/* RFC 4941 section 3.3:
+		 * If a received option will extend the lifetime of a public
+		 * address, the lifetimes of temporary addresses should
+		 * be extended, subject to the overall constraint that no
+		 * temporary addresses should ever remain "valid" or "preferred"
+		 * for a time longer than (TEMP_VALID_LIFETIME) or
+		 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
+		 */
+		age = (now - ift->cstamp) / HZ;
+		max_valid = idev->cnf.temp_valid_lft - age;
+		if (max_valid < 0)
+			max_valid = 0;
+
+		max_prefered = idev->cnf.temp_prefered_lft -
+			       idev->cnf.max_desync_factor - age;
+		if (max_prefered < 0)
+			max_prefered = 0;
+
+		if (valid_lft > max_valid)
+			valid_lft = max_valid;
+
+		if (prefered_lft > max_prefered)
+			prefered_lft = max_prefered;
+
+		spin_lock(&ift->lock);
+		flags = ift->flags;
+		ift->valid_lft = valid_lft;
+		ift->prefered_lft = prefered_lft;
+		ift->tstamp = now;
+		if (prefered_lft > 0)
+			ift->flags &= ~IFA_F_DEPRECATED;
+
+		spin_unlock(&ift->lock);
+		if (!(flags&IFA_F_TENTATIVE))
+			ipv6_ifa_notify(0, ift);
+	}
+
+	if ((create || list_empty(&idev->tempaddr_list)) &&
+	    idev->cnf.use_tempaddr > 0) {
+		/* When a new public address is created as described
+		 * in [ADDRCONF], also create a new temporary address.
+		 * Also create a temporary address if it's enabled but
+		 * no temporary address currently exists.
+		 */
+		read_unlock_bh(&idev->lock);
+		ipv6_create_tempaddr(ifp, NULL);
+	} else {
+		read_unlock_bh(&idev->lock);
+	}
+}
+
+void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
+{
+	struct prefix_info *pinfo;
+	__u32 valid_lft;
+	__u32 prefered_lft;
+	int addr_type;
+	u32 addr_flags = 0;
+	struct inet6_dev *in6_dev;
+	struct net *net = dev_net(dev);
+
+	pinfo = (struct prefix_info *) opt;
+
+	if (len < sizeof(struct prefix_info)) {
+		ADBG("addrconf: prefix option too short\n");
+		return;
+	}
+
+	/*
+	 *	Validation checks ([ADDRCONF], page 19)
+	 */
+
+	addr_type = ipv6_addr_type(&pinfo->prefix);
+
+	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
+		return;
+
+	valid_lft = ntohl(pinfo->valid);
+	prefered_lft = ntohl(pinfo->prefered);
+
+	if (prefered_lft > valid_lft) {
+		net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
+		return;
+	}
+
+	in6_dev = in6_dev_get(dev);
+
+	if (!in6_dev) {
+		net_dbg_ratelimited("addrconf: device %s not configured\n",
+				    dev->name);
+		return;
+	}
+
+	/*
+	 *	Two things going on here:
+	 *	1) Add routes for on-link prefixes
+	 *	2) Configure prefixes with the auto flag set
+	 */
+
+	if (pinfo->onlink) {
+		struct rt6_info *rt;
+		unsigned long rt_expires;
+
+		/* Avoid arithmetic overflow. Really, we could
+		 * save rt_expires in seconds, likely valid_lft,
+		 * but it would require division in fib gc, that it
+		 * not good.
+		 */
+		if (HZ > USER_HZ)
+			rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
+		else
+			rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
+
+		if (addrconf_finite_timeout(rt_expires))
+			rt_expires *= HZ;
+
+		rt = addrconf_get_prefix_route(&pinfo->prefix,
+					       pinfo->prefix_len,
+					       dev,
+					       RTF_ADDRCONF | RTF_PREFIX_RT,
+					       RTF_GATEWAY | RTF_DEFAULT);
+
+		if (rt) {
+			/* Autoconf prefix route */
+			if (valid_lft == 0) {
+				ip6_del_rt(rt);
+				rt = NULL;
+			} else if (addrconf_finite_timeout(rt_expires)) {
+				/* not infinity */
+				rt6_set_expires(rt, jiffies + rt_expires);
+			} else {
+				rt6_clean_expires(rt);
+			}
+		} else if (valid_lft) {
+			clock_t expires = 0;
+			int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
+			if (addrconf_finite_timeout(rt_expires)) {
+				/* not infinity */
+				flags |= RTF_EXPIRES;
+				expires = jiffies_to_clock_t(rt_expires);
+			}
+			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
+					      dev, expires, flags);
+		}
+		ip6_rt_put(rt);
+	}
+
+	/* Try to figure out our local address for this prefix */
+
+	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
+		struct inet6_ifaddr *ifp;
+		struct in6_addr addr;
+		int create = 0, update_lft = 0;
+		bool tokenized = false;
+
+		if (pinfo->prefix_len == 64) {
+			memcpy(&addr, &pinfo->prefix, 8);
+
+			if (!ipv6_addr_any(&in6_dev->token)) {
+				read_lock_bh(&in6_dev->lock);
+				memcpy(addr.s6_addr + 8,
+				       in6_dev->token.s6_addr + 8, 8);
+				read_unlock_bh(&in6_dev->lock);
+				tokenized = true;
+			} else if (in6_dev->addr_gen_mode ==
+				   IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
+				   !ipv6_generate_stable_address(&addr, 0,
+								 in6_dev)) {
+				addr_flags |= IFA_F_STABLE_PRIVACY;
+				goto ok;
+			} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
+				   ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
+				in6_dev_put(in6_dev);
+				return;
+			}
+			goto ok;
+		}
+		net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
+				    pinfo->prefix_len);
+		in6_dev_put(in6_dev);
+		return;
+
+ok:
+
+		ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
+
+		if (!ifp && valid_lft) {
+			int max_addresses = in6_dev->cnf.max_addresses;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+			if (in6_dev->cnf.optimistic_dad &&
+			    !net->ipv6.devconf_all->forwarding && sllao)
+				addr_flags = IFA_F_OPTIMISTIC;
+#endif
+
+			/* Do not allow to create too much of autoconfigured
+			 * addresses; this would be too easy way to crash kernel.
+			 */
+			if (!max_addresses ||
+			    ipv6_count_addresses(in6_dev) < max_addresses)
+				ifp = ipv6_add_addr(in6_dev, &addr, NULL,
+						    pinfo->prefix_len,
+						    addr_type&IPV6_ADDR_SCOPE_MASK,
+						    addr_flags, valid_lft,
+						    prefered_lft);
+
+			if (IS_ERR_OR_NULL(ifp)) {
+				in6_dev_put(in6_dev);
+				return;
+			}
+
+			update_lft = 0;
+			create = 1;
+			spin_lock_bh(&ifp->lock);
+			ifp->flags |= IFA_F_MANAGETEMPADDR;
+			ifp->cstamp = jiffies;
+			ifp->tokenized = tokenized;
+			spin_unlock_bh(&ifp->lock);
+			addrconf_dad_start(ifp);
+		}
+
+		if (ifp) {
+			u32 flags;
+			unsigned long now;
+			u32 stored_lft;
+
+			/* update lifetime (RFC2462 5.5.3 e) */
+			spin_lock_bh(&ifp->lock);
+			now = jiffies;
+			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
+				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
+			else
+				stored_lft = 0;
+			if (!update_lft && !create && stored_lft) {
+				const u32 minimum_lft = min_t(u32,
+					stored_lft, MIN_VALID_LIFETIME);
+				valid_lft = max(valid_lft, minimum_lft);
+
+				/* RFC4862 Section 5.5.3e:
+				 * "Note that the preferred lifetime of the
+				 *  corresponding address is always reset to
+				 *  the Preferred Lifetime in the received
+				 *  Prefix Information option, regardless of
+				 *  whether the valid lifetime is also reset or
+				 *  ignored."
+				 *
+				 * So we should always update prefered_lft here.
+				 */
+				update_lft = 1;
+			}
+
+			if (update_lft) {
+				ifp->valid_lft = valid_lft;
+				ifp->prefered_lft = prefered_lft;
+				ifp->tstamp = now;
+				flags = ifp->flags;
+				ifp->flags &= ~IFA_F_DEPRECATED;
+				spin_unlock_bh(&ifp->lock);
+
+				if (!(flags&IFA_F_TENTATIVE))
+					ipv6_ifa_notify(0, ifp);
+			} else
+				spin_unlock_bh(&ifp->lock);
+
+			manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
+					 create, now);
+
+			in6_ifa_put(ifp);
+			addrconf_verify();
+		}
+	}
+	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
+	in6_dev_put(in6_dev);
+}
+
+/*
+ *	Set destination address.
+ *	Special case for SIT interfaces where we create a new "virtual"
+ *	device.
+ */
+int addrconf_set_dstaddr(struct net *net, void __user *arg)
+{
+	struct in6_ifreq ireq;
+	struct net_device *dev;
+	int err = -EINVAL;
+
+	rtnl_lock();
+
+	err = -EFAULT;
+	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+		goto err_exit;
+
+	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
+
+	err = -ENODEV;
+	if (!dev)
+		goto err_exit;
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+	if (dev->type == ARPHRD_SIT) {
+		const struct net_device_ops *ops = dev->netdev_ops;
+		struct ifreq ifr;
+		struct ip_tunnel_parm p;
+
+		err = -EADDRNOTAVAIL;
+		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
+			goto err_exit;
+
+		memset(&p, 0, sizeof(p));
+		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
+		p.iph.saddr = 0;
+		p.iph.version = 4;
+		p.iph.ihl = 5;
+		p.iph.protocol = IPPROTO_IPV6;
+		p.iph.ttl = 64;
+		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
+
+		if (ops->ndo_do_ioctl) {
+			mm_segment_t oldfs = get_fs();
+
+			set_fs(KERNEL_DS);
+			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
+			set_fs(oldfs);
+		} else
+			err = -EOPNOTSUPP;
+
+		if (err == 0) {
+			err = -ENOBUFS;
+			dev = __dev_get_by_name(net, p.name);
+			if (!dev)
+				goto err_exit;
+			err = dev_open(dev);
+		}
+	}
+#endif
+
+err_exit:
+	rtnl_unlock();
+	return err;
+}
+
+static int ipv6_mc_config(struct sock *sk, bool join,
+			  const struct in6_addr *addr, int ifindex)
+{
+	int ret;
+
+	ASSERT_RTNL();
+
+	lock_sock(sk);
+	if (join)
+		ret = ipv6_sock_mc_join(sk, ifindex, addr);
+	else
+		ret = ipv6_sock_mc_drop(sk, ifindex, addr);
+	release_sock(sk);
+
+	return ret;
+}
+
+/*
+ *	Manual configuration of address on an interface
+ */
+static int inet6_addr_add(struct net *net, int ifindex,
+			  const struct in6_addr *pfx,
+			  const struct in6_addr *peer_pfx,
+			  unsigned int plen, __u32 ifa_flags,
+			  __u32 prefered_lft, __u32 valid_lft)
+{
+	struct inet6_ifaddr *ifp;
+	struct inet6_dev *idev;
+	struct net_device *dev;
+	unsigned long timeout;
+	clock_t expires;
+	int scope;
+	u32 flags;
+
+	ASSERT_RTNL();
+
+	if (plen > 128)
+		return -EINVAL;
+
+	/* check the lifetime */
+	if (!valid_lft || prefered_lft > valid_lft)
+		return -EINVAL;
+
+	if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
+		return -EINVAL;
+
+	dev = __dev_get_by_index(net, ifindex);
+	if (!dev)
+		return -ENODEV;
+
+	idev = addrconf_add_dev(dev);
+	if (IS_ERR(idev))
+		return PTR_ERR(idev);
+
+	if (ifa_flags & IFA_F_MCAUTOJOIN) {
+		int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+					 true, pfx, ifindex);
+
+		if (ret < 0)
+			return ret;
+	}
+
+	scope = ipv6_addr_scope(pfx);
+
+	timeout = addrconf_timeout_fixup(valid_lft, HZ);
+	if (addrconf_finite_timeout(timeout)) {
+		expires = jiffies_to_clock_t(timeout * HZ);
+		valid_lft = timeout;
+		flags = RTF_EXPIRES;
+	} else {
+		expires = 0;
+		flags = 0;
+		ifa_flags |= IFA_F_PERMANENT;
+	}
+
+	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
+	if (addrconf_finite_timeout(timeout)) {
+		if (timeout == 0)
+			ifa_flags |= IFA_F_DEPRECATED;
+		prefered_lft = timeout;
+	}
+
+	ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
+			    valid_lft, prefered_lft);
+
+	if (!IS_ERR(ifp)) {
+		if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
+			addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
+					      expires, flags);
+		}
+
+		/*
+		 * Note that section 3.1 of RFC 4429 indicates
+		 * that the Optimistic flag should not be set for
+		 * manually configured addresses
+		 */
+		addrconf_dad_start(ifp);
+		if (ifa_flags & IFA_F_MANAGETEMPADDR)
+			manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
+					 true, jiffies);
+		in6_ifa_put(ifp);
+		addrconf_verify_rtnl();
+		return 0;
+	} else if (ifa_flags & IFA_F_MCAUTOJOIN) {
+		ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+			       false, pfx, ifindex);
+	}
+
+	return PTR_ERR(ifp);
+}
+
+static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
+			  const struct in6_addr *pfx, unsigned int plen)
+{
+	struct inet6_ifaddr *ifp;
+	struct inet6_dev *idev;
+	struct net_device *dev;
+
+	if (plen > 128)
+		return -EINVAL;
+
+	dev = __dev_get_by_index(net, ifindex);
+	if (!dev)
+		return -ENODEV;
+
+	idev = __in6_dev_get(dev);
+	if (!idev)
+		return -ENXIO;
+
+	read_lock_bh(&idev->lock);
+	list_for_each_entry(ifp, &idev->addr_list, if_list) {
+		if (ifp->prefix_len == plen &&
+		    ipv6_addr_equal(pfx, &ifp->addr)) {
+			in6_ifa_hold(ifp);
+			read_unlock_bh(&idev->lock);
+
+			if (!(ifp->flags & IFA_F_TEMPORARY) &&
+			    (ifa_flags & IFA_F_MANAGETEMPADDR))
+				manage_tempaddrs(idev, ifp, 0, 0, false,
+						 jiffies);
+			ipv6_del_addr(ifp);
+			addrconf_verify_rtnl();
+			if (ipv6_addr_is_multicast(pfx)) {
+				ipv6_mc_config(net->ipv6.mc_autojoin_sk,
+					       false, pfx, dev->ifindex);
+			}
+			return 0;
+		}
+	}
+	read_unlock_bh(&idev->lock);
+	return -EADDRNOTAVAIL;
+}
+
+
+int addrconf_add_ifaddr(struct net *net, void __user *arg)
+{
+	struct in6_ifreq ireq;
+	int err;
+
+	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+		return -EFAULT;
+
+	rtnl_lock();
+	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
+			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
+			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+	rtnl_unlock();
+	return err;
+}
+
+int addrconf_del_ifaddr(struct net *net, void __user *arg)
+{
+	struct in6_ifreq ireq;
+	int err;
+
+	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
+		return -EFAULT;
+
+	rtnl_lock();
+	err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
+			     ireq.ifr6_prefixlen);
+	rtnl_unlock();
+	return err;
+}
+
+static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
+		     int plen, int scope)
+{
+	struct inet6_ifaddr *ifp;
+
+	ifp = ipv6_add_addr(idev, addr, NULL, plen,
+			    scope, IFA_F_PERMANENT,
+			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+	if (!IS_ERR(ifp)) {
+		spin_lock_bh(&ifp->lock);
+		ifp->flags &= ~IFA_F_TENTATIVE;
+		spin_unlock_bh(&ifp->lock);
+		ipv6_ifa_notify(RTM_NEWADDR, ifp);
+		in6_ifa_put(ifp);
+	}
+}
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+static void sit_add_v4_addrs(struct inet6_dev *idev)
+{
+	struct in6_addr addr;
+	struct net_device *dev;
+	struct net *net = dev_net(idev->dev);
+	int scope, plen;
+	u32 pflags = 0;
+
+	ASSERT_RTNL();
+
+	memset(&addr, 0, sizeof(struct in6_addr));
+	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
+
+	if (idev->dev->flags&IFF_POINTOPOINT) {
+		addr.s6_addr32[0] = htonl(0xfe800000);
+		scope = IFA_LINK;
+		plen = 64;
+	} else {
+		scope = IPV6_ADDR_COMPATv4;
+		plen = 96;
+		pflags |= RTF_NONEXTHOP;
+	}
+
+	if (addr.s6_addr32[3]) {
+		add_addr(idev, &addr, plen, scope);
+		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
+		return;
+	}
+
+	for_each_netdev(net, dev) {
+		struct in_device *in_dev = __in_dev_get_rtnl(dev);
+		if (in_dev && (dev->flags & IFF_UP)) {
+			struct in_ifaddr *ifa;
+
+			int flag = scope;
+
+			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
+
+				addr.s6_addr32[3] = ifa->ifa_local;
+
+				if (ifa->ifa_scope == RT_SCOPE_LINK)
+					continue;
+				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
+					if (idev->dev->flags&IFF_POINTOPOINT)
+						continue;
+					flag |= IFA_HOST;
+				}
+
+				add_addr(idev, &addr, plen, flag);
+				addrconf_prefix_route(&addr, plen, idev->dev, 0,
+						      pflags);
+			}
+		}
+	}
+}
+#endif
+
+static void init_loopback(struct net_device *dev)
+{
+	struct inet6_dev  *idev;
+	struct net_device *sp_dev;
+	struct inet6_ifaddr *sp_ifa;
+	struct rt6_info *sp_rt;
+
+	/* ::1 */
+
+	ASSERT_RTNL();
+
+	idev = ipv6_find_idev(dev);
+	if (!idev) {
+		pr_debug("%s: add_dev failed\n", __func__);
+		return;
+	}
+
+	add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
+
+	/* Add routes to other interface's IPv6 addresses */
+	for_each_netdev(dev_net(dev), sp_dev) {
+		if (!strcmp(sp_dev->name, dev->name))
+			continue;
+
+		idev = __in6_dev_get(sp_dev);
+		if (!idev)
+			continue;
+
+		read_lock_bh(&idev->lock);
+		list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
+
+			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
+				continue;
+
+			if (sp_ifa->rt) {
+				/* This dst has been added to garbage list when
+				 * lo device down, release this obsolete dst and
+				 * reallocate a new router for ifa.
+				 */
+				if (sp_ifa->rt->dst.obsolete > 0) {
+					ip6_rt_put(sp_ifa->rt);
+					sp_ifa->rt = NULL;
+				} else {
+					continue;
+				}
+			}
+
+			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
+
+			/* Failure cases are ignored */
+			if (!IS_ERR(sp_rt)) {
+				sp_ifa->rt = sp_rt;
+				ip6_ins_rt(sp_rt);
+			}
+		}
+		read_unlock_bh(&idev->lock);
+	}
+}
+
+static void addrconf_add_linklocal(struct inet6_dev *idev,
+				   const struct in6_addr *addr, u32 flags)
+{
+	struct inet6_ifaddr *ifp;
+	u32 addr_flags = flags | IFA_F_PERMANENT;
+
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	if (idev->cnf.optimistic_dad &&
+	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
+		addr_flags |= IFA_F_OPTIMISTIC;
+#endif
+
+	ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
+			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
+	if (!IS_ERR(ifp)) {
+		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
+		addrconf_dad_start(ifp);
+		in6_ifa_put(ifp);
+	}
+}
+
+static bool ipv6_reserved_interfaceid(struct in6_addr address)
+{
+	if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
+		return true;
+
+	if (address.s6_addr32[2] == htonl(0x02005eff) &&
+	    ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
+		return true;
+
+	if (address.s6_addr32[2] == htonl(0xfdffffff) &&
+	    ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
+		return true;
+
+	return false;
+}
+
+static int ipv6_generate_stable_address(struct in6_addr *address,
+					u8 dad_count,
+					const struct inet6_dev *idev)
+{
+	static DEFINE_SPINLOCK(lock);
+	static __u32 digest[SHA_DIGEST_WORDS];
+	static __u32 workspace[SHA_WORKSPACE_WORDS];
+
+	static union {
+		char __data[SHA_MESSAGE_BYTES];
+		struct {
+			struct in6_addr secret;
+			__be32 prefix[2];
+			unsigned char hwaddr[MAX_ADDR_LEN];
+			u8 dad_count;
+		} __packed;
+	} data;
+
+	struct in6_addr secret;
+	struct in6_addr temp;
+	struct net *net = dev_net(idev->dev);
+
+	BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
+
+	if (idev->cnf.stable_secret.initialized)
+		secret = idev->cnf.stable_secret.secret;
+	else if (net->ipv6.devconf_dflt->stable_secret.initialized)
+		secret = net->ipv6.devconf_dflt->stable_secret.secret;
+	else
+		return -1;
+
+retry:
+	spin_lock_bh(&lock);
+
+	sha_init(digest);
+	memset(&data, 0, sizeof(data));
+	memset(workspace, 0, sizeof(workspace));
+	memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
+	data.prefix[0] = address->s6_addr32[0];
+	data.prefix[1] = address->s6_addr32[1];
+	data.secret = secret;
+	data.dad_count = dad_count;
+
+	sha_transform(digest, data.__data, workspace);
+
+	temp = *address;
+	temp.s6_addr32[2] = (__force __be32)digest[0];
+	temp.s6_addr32[3] = (__force __be32)digest[1];
+
+	spin_unlock_bh(&lock);
+
+	if (ipv6_reserved_interfaceid(temp)) {
+		dad_count++;
+		if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
+			return -1;
+		goto retry;
+	}
+
+	*address = temp;
+	return 0;
+}
+
+static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
+{
+	struct in6_addr addr;
+
+	ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
+
+	if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
+		if (!ipv6_generate_stable_address(&addr, 0, idev))
+			addrconf_add_linklocal(idev, &addr,
+					       IFA_F_STABLE_PRIVACY);
+		else if (prefix_route)
+			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+	} else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
+		/* addrconf_add_linklocal also adds a prefix_route and we
+		 * only need to care about prefix routes if ipv6_generate_eui64
+		 * couldn't generate one.
+		 */
+		if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
+			addrconf_add_linklocal(idev, &addr, 0);
+		else if (prefix_route)
+			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
+	}
+}
+
+static void addrconf_dev_config(struct net_device *dev)
+{
+	struct inet6_dev *idev;
+
+	ASSERT_RTNL();
+
+	if ((dev->type != ARPHRD_ETHER) &&
+	    (dev->type != ARPHRD_FDDI) &&
+	    (dev->type != ARPHRD_ARCNET) &&
+	    (dev->type != ARPHRD_INFINIBAND) &&
+	    (dev->type != ARPHRD_IEEE802154) &&
+	    (dev->type != ARPHRD_IEEE1394) &&
+	    (dev->type != ARPHRD_TUNNEL6) &&
+	    (dev->type != ARPHRD_6LOWPAN)) {
+		/* Alas, we support only Ethernet autoconfiguration. */
+		return;
+	}
+
+	idev = addrconf_add_dev(dev);
+	if (IS_ERR(idev))
+		return;
+
+	addrconf_addr_gen(idev, false);
+}
+
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+static void addrconf_sit_config(struct net_device *dev)
+{
+	struct inet6_dev *idev;
+
+	ASSERT_RTNL();
+
+	/*
+	 * Configure the tunnel with one of our IPv4
+	 * addresses... we should configure all of
+	 * our v4 addrs in the tunnel
+	 */
+
+	idev = ipv6_find_idev(dev);
+	if (!idev) {
+		pr_debug("%s: add_dev failed\n", __func__);
+		return;
+	}
+
+	if (dev->priv_flags & IFF_ISATAP) {
+		addrconf_addr_gen(idev, false);
+		return;
+	}
+
+	sit_add_v4_addrs(idev);
+
+	if (dev->flags&IFF_POINTOPOINT)
+		addrconf_add_mroute(dev);
+}
+#endif
+
+#if IS_ENABLED(CONFIG_NET_IPGRE)
+static void addrconf_gre_config(struct net_device *dev)
+{
+	struct inet6_dev *idev;
+
+	ASSERT_RTNL();
+
+	idev = ipv6_find_idev(dev);
+	if (!idev) {
+		pr_debug("%s: add_dev failed\n", __func__);
+		return;
+	}
+
+	addrconf_addr_gen(idev, true);
+}
+#endif
+
+static int addrconf_notify(struct notifier_block *this, unsigned long event,
+			   void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct inet6_dev *idev = __in6_dev_get(dev);
+	int run_pending = 0;
+	int err;
+
+	switch (event) {
+	case NETDEV_REGISTER:
+		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
+			idev = ipv6_add_dev(dev);
+			if (IS_ERR(idev))
+				return notifier_from_errno(PTR_ERR(idev));
+		}
+		break;
+
+	case NETDEV_UP:
+	case NETDEV_CHANGE:
+		if (dev->flags & IFF_SLAVE)
+			break;
+
+		if (idev && idev->cnf.disable_ipv6)
+			break;
+
+		if (event == NETDEV_UP) {
+			if (!addrconf_qdisc_ok(dev)) {
+				/* device is not ready yet. */
+				pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
+					dev->name);
+				break;
+			}
+
+			if (!idev && dev->mtu >= IPV6_MIN_MTU)
+				idev = ipv6_add_dev(dev);
+
+			if (!IS_ERR_OR_NULL(idev)) {
+				idev->if_flags |= IF_READY;
+				run_pending = 1;
+			}
+		} else {
+			if (!addrconf_qdisc_ok(dev)) {
+				/* device is still not ready. */
+				break;
+			}
+
+			if (idev) {
+				if (idev->if_flags & IF_READY)
+					/* device is already configured. */
+					break;
+				idev->if_flags |= IF_READY;
+			}
+
+			pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
+				dev->name);
+
+			run_pending = 1;
+		}
+
+		switch (dev->type) {
+#if IS_ENABLED(CONFIG_IPV6_SIT)
+		case ARPHRD_SIT:
+			addrconf_sit_config(dev);
+			break;
+#endif
+#if IS_ENABLED(CONFIG_NET_IPGRE)
+		case ARPHRD_IPGRE:
+			addrconf_gre_config(dev);
+			break;
+#endif
+		case ARPHRD_LOOPBACK:
+			init_loopback(dev);
+			break;
+
+		default:
+			addrconf_dev_config(dev);
+			break;
+		}
+
+		if (!IS_ERR_OR_NULL(idev)) {
+			if (run_pending)
+				addrconf_dad_run(idev);
+
+			/*
+			 * If the MTU changed during the interface down,
+			 * when the interface up, the changed MTU must be
+			 * reflected in the idev as well as routers.
+			 */
+			if (idev->cnf.mtu6 != dev->mtu &&
+			    dev->mtu >= IPV6_MIN_MTU) {
+				rt6_mtu_change(dev, dev->mtu);
+				idev->cnf.mtu6 = dev->mtu;
+			}
+			idev->tstamp = jiffies;
+			inet6_ifinfo_notify(RTM_NEWLINK, idev);
+
+			/*
+			 * If the changed mtu during down is lower than
+			 * IPV6_MIN_MTU stop IPv6 on this interface.
+			 */
+			if (dev->mtu < IPV6_MIN_MTU)
+				addrconf_ifdown(dev, 1);
+		}
+		break;
+
+	case NETDEV_CHANGEMTU:
+		if (idev && dev->mtu >= IPV6_MIN_MTU) {
+			rt6_mtu_change(dev, dev->mtu);
+			idev->cnf.mtu6 = dev->mtu;
+			break;
+		}
+
+		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
+			idev = ipv6_add_dev(dev);
+			if (!IS_ERR(idev))
+				break;
+		}
+
+		/*
+		 * if MTU under IPV6_MIN_MTU.
+		 * Stop IPv6 on this interface.
+		 */
+
+	case NETDEV_DOWN:
+	case NETDEV_UNREGISTER:
+		/*
+		 *	Remove all addresses from this interface.
+		 */
+		addrconf_ifdown(dev, event != NETDEV_DOWN);
+		break;
+
+	case NETDEV_CHANGENAME:
+		if (idev) {
+			snmp6_unregister_dev(idev);
+			addrconf_sysctl_unregister(idev);
+			err = addrconf_sysctl_register(idev);
+			if (err)
+				return notifier_from_errno(err);
+			err = snmp6_register_dev(idev);
+			if (err) {
+				addrconf_sysctl_unregister(idev);
+				return notifier_from_errno(err);
+			}
+		}
+		break;
+
+	case NETDEV_PRE_TYPE_CHANGE:
+	case NETDEV_POST_TYPE_CHANGE:
+		addrconf_type_change(dev, event);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+/*
+ *	addrconf module should be notified of a device going up
+ */
+static struct notifier_block ipv6_dev_notf = {
+	.notifier_call = addrconf_notify,
+};
+
+static void addrconf_type_change(struct net_device *dev, unsigned long event)
+{
+	struct inet6_dev *idev;
+	ASSERT_RTNL();
+
+	idev = __in6_dev_get(dev);
+
+	if (event == NETDEV_POST_TYPE_CHANGE)
+		ipv6_mc_remap(idev);
+	else if (event == NETDEV_PRE_TYPE_CHANGE)
+		ipv6_mc_unmap(idev);
+}
+
+static int addrconf_ifdown(struct net_device *dev, int how)
+{
+	struct net *net = dev_net(dev);
+	struct inet6_dev *idev;
+	struct inet6_ifaddr *ifa;
+	int state, i;
+
+	ASSERT_RTNL();
+
+	rt6_ifdown(net, dev);
+	neigh_ifdown(&nd_tbl, dev);
+
+	idev = __in6_dev_get(dev);
+	if (!idev)
+		return -ENODEV;
+
+	/*
+	 * Step 1: remove reference to ipv6 device from parent device.
+	 *	   Do not dev_put!
+	 */
+	if (how) {
+		idev->dead = 1;
+
+		/* protected by rtnl_lock */
+		RCU_INIT_POINTER(dev->ip6_ptr, NULL);
+
+		/* Step 1.5: remove snmp6 entry */
+		snmp6_unregister_dev(idev);
+
+	}
+
+	/* Step 2: clear hash table */
+	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
+		struct hlist_head *h = &inet6_addr_lst[i];
+
+		spin_lock_bh(&addrconf_hash_lock);
+restart:
+		hlist_for_each_entry_rcu(ifa, h, addr_lst) {
+			if (ifa->idev == idev) {
+				hlist_del_init_rcu(&ifa->addr_lst);
+				addrconf_del_dad_work(ifa);
+				goto restart;
+			}
+		}
+		spin_unlock_bh(&addrconf_hash_lock);
+	}
+
+	write_lock_bh(&idev->lock);
+
+	addrconf_del_rs_timer(idev);
+
+	/* Step 2: clear flags for stateless addrconf */
+	if (!how)
+		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
+
+	if (how && del_timer(&idev->regen_timer))
+		in6_dev_put(idev);
+
+	/* Step 3: clear tempaddr list */
+	while (!list_empty(&idev->tempaddr_list)) {
+		ifa = list_first_entry(&idev->tempaddr_list,
+				       struct inet6_ifaddr, tmp_list);
+		list_del(&ifa->tmp_list);
+		write_unlock_bh(&idev->lock);
+		spin_lock_bh(&ifa->lock);
+
+		if (ifa->ifpub) {
+			in6_ifa_put(ifa->ifpub);
+			ifa->ifpub = NULL;
+		}
+		spin_unlock_bh(&ifa->lock);
+		in6_ifa_put(ifa);
+		write_lock_bh(&idev->lock);
+	}
+
+	while (!list_empty(&idev->addr_list)) {
+		ifa = list_first_entry(&idev->addr_list,
+				       struct inet6_ifaddr, if_list);
+		addrconf_del_dad_work(ifa);
+
+		list_del(&ifa->if_list);
+
+		write_unlock_bh(&idev->lock);
+
+		spin_lock_bh(&ifa->lock);
+		state = ifa->state;
+		ifa->state = INET6_IFADDR_STATE_DEAD;
+		spin_unlock_bh(&ifa->lock);
+
+		if (state != INET6_IFADDR_STATE_DEAD) {
+			__ipv6_ifa_notify(RTM_DELADDR, ifa);
+			inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
+		}
+		in6_ifa_put(ifa);
+
+		write_lock_bh(&idev->lock);
+	}
+
+	write_unlock_bh(&idev->lock);
+
+	/* Step 5: Discard anycast and multicast list */
+	if (how) {
+		ipv6_ac_destroy_dev(idev);
+		ipv6_mc_destroy_dev(idev);
+	} else {
+		ipv6_mc_down(idev);
+	}
+
+	idev->tstamp = jiffies;
+
+	/* Last: Shot the device (if unregistered) */
+	if (how) {
+		addrconf_sysctl_unregister(idev);
+		neigh_parms_release(&nd_tbl, idev->nd_parms);
+		neigh_ifdown(&nd_tbl, dev);
+		in6_dev_put(idev);
+	}
+	return 0;
+}
+
+static void addrconf_rs_timer(unsigned long data)
+{
+	struct inet6_dev *idev = (struct inet6_dev *)data;
+	struct net_device *dev = idev->dev;
+	struct in6_addr lladdr;
+
+	write_lock(&idev->lock);
+	if (idev->dead || !(idev->if_flags & IF_READY))
+		goto out;
+
+	if (!ipv6_accept_ra(idev))
+		goto out;
+
+	/* Announcement received after solicitation was sent */
+	if (idev->if_flags & IF_RA_RCVD)
+		goto out;
+
+	if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
+		write_unlock(&idev->lock);
+		if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
+			ndisc_send_rs(dev, &lladdr,
+				      &in6addr_linklocal_allrouters);
+		else
+			goto put;
+
+		write_lock(&idev->lock);
+		/* The wait after the last probe can be shorter */
+		addrconf_mod_rs_timer(idev, (idev->rs_probes ==
+					     idev->cnf.rtr_solicits) ?
+				      idev->cnf.rtr_solicit_delay :
+				      idev->cnf.rtr_solicit_interval);
+	} else {
+		/*
+		 * Note: we do not support deprecated "all on-link"
+		 * assumption any longer.
+		 */
+		pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
+	}
+
+out:
+	write_unlock(&idev->lock);
+put:
+	in6_dev_put(idev);
+}
+
+/*
+ *	Duplicate Address Detection
+ */
+static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
+{
+	unsigned long rand_num;
+	struct inet6_dev *idev = ifp->idev;
+
+	if (ifp->flags & IFA_F_OPTIMISTIC)
+		rand_num = 0;
+	else
+		rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
+
+	ifp->dad_probes = idev->cnf.dad_transmits;
+	addrconf_mod_dad_work(ifp, rand_num);
+}
+
+static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
+{
+	struct inet6_dev *idev = ifp->idev;
+	struct net_device *dev = idev->dev;
+
+	addrconf_join_solict(dev, &ifp->addr);
+
+	prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
+
+	read_lock_bh(&idev->lock);
+	spin_lock(&ifp->lock);
+	if (ifp->state == INET6_IFADDR_STATE_DEAD)
+		goto out;
+
+	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
+	    idev->cnf.accept_dad < 1 ||
+	    !(ifp->flags&IFA_F_TENTATIVE) ||
+	    ifp->flags & IFA_F_NODAD) {
+		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
+		spin_unlock(&ifp->lock);
+		read_unlock_bh(&idev->lock);
+
+		addrconf_dad_completed(ifp);
+		return;
+	}
+
+	if (!(idev->if_flags & IF_READY)) {
+		spin_unlock(&ifp->lock);
+		read_unlock_bh(&idev->lock);
+		/*
+		 * If the device is not ready:
+		 * - keep it tentative if it is a permanent address.
+		 * - otherwise, kill it.
+		 */
+		in6_ifa_hold(ifp);
+		addrconf_dad_stop(ifp, 0);
+		return;
+	}
+
+	/*
+	 * Optimistic nodes can start receiving
+	 * Frames right away
+	 */
+	if (ifp->flags & IFA_F_OPTIMISTIC) {
+		ip6_ins_rt(ifp->rt);
+		if (ipv6_use_optimistic_addr(idev)) {
+			/* Because optimistic nodes can use this address,
+			 * notify listeners. If DAD fails, RTM_DELADDR is sent.
+			 */
+			ipv6_ifa_notify(RTM_NEWADDR, ifp);
+		}
+	}
+
+	addrconf_dad_kick(ifp);
+out:
+	spin_unlock(&ifp->lock);
+	read_unlock_bh(&idev->lock);
+}
+
+static void addrconf_dad_start(struct inet6_ifaddr *ifp)
+{
+	bool begin_dad = false;
+
+	spin_lock_bh(&ifp->lock);
+	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
+		ifp->state = INET6_IFADDR_STATE_PREDAD;
+		begin_dad = true;
+	}
+	spin_unlock_bh(&ifp->lock);
+
+	if (begin_dad)
+		addrconf_mod_dad_work(ifp, 0);
+}
+
+static void addrconf_dad_work(struct work_struct *w)
+{
+	struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
+						struct inet6_ifaddr,
+						dad_work);
+	struct inet6_dev *idev = ifp->idev;
+	struct in6_addr mcaddr;
+
+	enum {
+		DAD_PROCESS,
+		DAD_BEGIN,
+		DAD_ABORT,
+	} action = DAD_PROCESS;
+
+	rtnl_lock();
+
+	spin_lock_bh(&ifp->lock);
+	if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
+		action = DAD_BEGIN;
+		ifp->state = INET6_IFADDR_STATE_DAD;
+	} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
+		action = DAD_ABORT;
+		ifp->state = INET6_IFADDR_STATE_POSTDAD;
+	}
+	spin_unlock_bh(&ifp->lock);
+
+	if (action == DAD_BEGIN) {
+		addrconf_dad_begin(ifp);
+		goto out;
+	} else if (action == DAD_ABORT) {
+		addrconf_dad_stop(ifp, 1);
+		goto out;
+	}
+
+	if (!ifp->dad_probes && addrconf_dad_end(ifp))
+		goto out;
+
+	write_lock_bh(&idev->lock);
+	if (idev->dead || !(idev->if_flags & IF_READY)) {
+		write_unlock_bh(&idev->lock);
+		goto out;
+	}
+
+	spin_lock(&ifp->lock);
+	if (ifp->state == INET6_IFADDR_STATE_DEAD) {
+		spin_unlock(&ifp->lock);
+		write_unlock_bh(&idev->lock);
+		goto out;
+	}
+
+	if (ifp->dad_probes == 0) {
+		/*
+		 * DAD was successful
+		 */
+
+		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
+		spin_unlock(&ifp->lock);
+		write_unlock_bh(&idev->lock);
+
+		addrconf_dad_completed(ifp);
+
+		goto out;
+	}
+
+	ifp->dad_probes--;
+	addrconf_mod_dad_work(ifp,
+			      NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
+	spin_unlock(&ifp->lock);
+	write_unlock_bh(&idev->lock);
+
+	/* send a neighbour solicitation for our addr */
+	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
+	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
+out:
+	in6_ifa_put(ifp);
+	rtnl_unlock();
+}
+
+/* ifp->idev must be at least read locked */
+static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
+{
+	struct inet6_ifaddr *ifpiter;
+	struct inet6_dev *idev = ifp->idev;
+
+	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
+		if (ifpiter->scope > IFA_LINK)
+			break;
+		if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
+		    (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
+				       IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
+		    IFA_F_PERMANENT)
+			return false;
+	}
+	return true;
+}
+
+static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
+{
+	struct net_device *dev = ifp->idev->dev;
+	struct in6_addr lladdr;
+	bool send_rs, send_mld;
+
+	addrconf_del_dad_work(ifp);
+
+	/*
+	 *	Configure the address for reception. Now it is valid.
+	 */
+
+	ipv6_ifa_notify(RTM_NEWADDR, ifp);
+
+	/* If added prefix is link local and we are prepared to process
+	   router advertisements, start sending router solicitations.
+	 */
+
+	read_lock_bh(&ifp->idev->lock);
+	send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
+	send_rs = send_mld &&
+		  ipv6_accept_ra(ifp->idev) &&
+		  ifp->idev->cnf.rtr_solicits > 0 &&
+		  (dev->flags&IFF_LOOPBACK) == 0;
+	read_unlock_bh(&ifp->idev->lock);
+
+	/* While dad is in progress mld report's source address is in6_addrany.
+	 * Resend with proper ll now.
+	 */
+	if (send_mld)
+		ipv6_mc_dad_complete(ifp->idev);
+
+	if (send_rs) {
+		/*
+		 *	If a host as already performed a random delay
+		 *	[...] as part of DAD [...] there is no need
+		 *	to delay again before sending the first RS
+		 */
+		if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
+			return;
+		ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
+
+		write_lock_bh(&ifp->idev->lock);
+		spin_lock(&ifp->lock);
+		ifp->idev->rs_probes = 1;
+		ifp->idev->if_flags |= IF_RS_SENT;
+		addrconf_mod_rs_timer(ifp->idev,
+				      ifp->idev->cnf.rtr_solicit_interval);
+		spin_unlock(&ifp->lock);
+		write_unlock_bh(&ifp->idev->lock);
+	}
+}
+
+static void addrconf_dad_run(struct inet6_dev *idev)
+{
+	struct inet6_ifaddr *ifp;
+
+	read_lock_bh(&idev->lock);
+	list_for_each_entry(ifp, &idev->addr_list, if_list) {
+		spin_lock(&ifp->lock);
+		if (ifp->flags & IFA_F_TENTATIVE &&
+		    ifp->state == INET6_IFADDR_STATE_DAD)
+			addrconf_dad_kick(ifp);
+		spin_unlock(&ifp->lock);
+	}
+	read_unlock_bh(&idev->lock);
+}
+
+#ifdef CONFIG_PROC_FS
+struct if6_iter_state {
+	struct seq_net_private p;
+	int bucket;
+	int offset;
+};
+
+static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
+{
+	struct inet6_ifaddr *ifa = NULL;
+	struct if6_iter_state *state = seq->private;
+	struct net *net = seq_file_net(seq);
+	int p = 0;
+
+	/* initial bucket if pos is 0 */
+	if (pos == 0) {
+		state->bucket = 0;
+		state->offset = 0;
+	}
+
+	for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
+		hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
+					 addr_lst) {
+			if (!net_eq(dev_net(ifa->idev->dev), net))
+				continue;
+			/* sync with offset */
+			if (p < state->offset) {
+				p++;
+				continue;
+			}
+			state->offset++;
+			return ifa;
+		}
+
+		/* prepare for next bucket */
+		state->offset = 0;
+		p = 0;
+	}
+	return NULL;
+}
+
+static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
+					 struct inet6_ifaddr *ifa)
+{
+	struct if6_iter_state *state = seq->private;
+	struct net *net = seq_file_net(seq);
+
+	hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
+		if (!net_eq(dev_net(ifa->idev->dev), net))
+			continue;
+		state->offset++;
+		return ifa;
+	}
+
+	while (++state->bucket < IN6_ADDR_HSIZE) {
+		state->offset = 0;
+		hlist_for_each_entry_rcu_bh(ifa,
+				     &inet6_addr_lst[state->bucket], addr_lst) {
+			if (!net_eq(dev_net(ifa->idev->dev), net))
+				continue;
+			state->offset++;
+			return ifa;
+		}
+	}
+
+	return NULL;
+}
+
+static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(rcu_bh)
+{
+	rcu_read_lock_bh();
+	return if6_get_first(seq, *pos);
+}
+
+static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct inet6_ifaddr *ifa;
+
+	ifa = if6_get_next(seq, v);
+	++*pos;
+	return ifa;
+}
+
+static void if6_seq_stop(struct seq_file *seq, void *v)
+	__releases(rcu_bh)
+{
+	rcu_read_unlock_bh();
+}
+
+static int if6_seq_show(struct seq_file *seq, void *v)
+{
+	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
+	seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
+		   &ifp->addr,
+		   ifp->idev->dev->ifindex,
+		   ifp->prefix_len,
+		   ifp->scope,
+		   (u8) ifp->flags,
+		   ifp->idev->dev->name);
+	return 0;
+}
+
+static const struct seq_operations if6_seq_ops = {
+	.start	= if6_seq_start,
+	.next	= if6_seq_next,
+	.show	= if6_seq_show,
+	.stop	= if6_seq_stop,
+};
+
+static int if6_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open_net(inode, file, &if6_seq_ops,
+			    sizeof(struct if6_iter_state));
+}
+
+static const struct file_operations if6_fops = {
+	.owner		= THIS_MODULE,
+	.open		= if6_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release_net,
+};
+
+static int __net_init if6_proc_net_init(struct net *net)
+{
+	if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
+		return -ENOMEM;
+	return 0;
+}
+
+static void __net_exit if6_proc_net_exit(struct net *net)
+{
+	remove_proc_entry("if_inet6", net->proc_net);
+}
+
+static struct pernet_operations if6_proc_net_ops = {
+	.init = if6_proc_net_init,
+	.exit = if6_proc_net_exit,
+};
+
+int __init if6_proc_init(void)
+{
+	return register_pernet_subsys(&if6_proc_net_ops);
+}
+
+void if6_proc_exit(void)
+{
+	unregister_pernet_subsys(&if6_proc_net_ops);
+}
+#endif	/* CONFIG_PROC_FS */
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+/* Check if address is a home address configured on any interface. */
+int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
+{
+	int ret = 0;
+	struct inet6_ifaddr *ifp = NULL;
+	unsigned int hash = inet6_addr_hash(addr);
+
+	rcu_read_lock_bh();
+	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
+		if (!net_eq(dev_net(ifp->idev->dev), net))
+			continue;
+		if (ipv6_addr_equal(&ifp->addr, addr) &&
+		    (ifp->flags & IFA_F_HOMEADDRESS)) {
+			ret = 1;
+			break;
+		}
+	}
+	rcu_read_unlock_bh();
+	return ret;
+}
+#endif
+
+/*
+ *	Periodic address status verification
+ */
+
+static void addrconf_verify_rtnl(void)
+{
+	unsigned long now, next, next_sec, next_sched;
+	struct inet6_ifaddr *ifp;
+	int i;
+
+	ASSERT_RTNL();
+
+	rcu_read_lock_bh();
+	now = jiffies;
+	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
+
+	cancel_delayed_work(&addr_chk_work);
+
+	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
+restart:
+		hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
+			unsigned long age;
+
+			/* When setting preferred_lft to a value not zero or
+			 * infinity, while valid_lft is infinity
+			 * IFA_F_PERMANENT has a non-infinity life time.
+			 */
+			if ((ifp->flags & IFA_F_PERMANENT) &&
+			    (ifp->prefered_lft == INFINITY_LIFE_TIME))
+				continue;
+
+			spin_lock(&ifp->lock);
+			/* We try to batch several events at once. */
+			age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
+			    age >= ifp->valid_lft) {
+				spin_unlock(&ifp->lock);
+				in6_ifa_hold(ifp);
+				ipv6_del_addr(ifp);
+				goto restart;
+			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
+				spin_unlock(&ifp->lock);
+				continue;
+			} else if (age >= ifp->prefered_lft) {
+				/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
+				int deprecate = 0;
+
+				if (!(ifp->flags&IFA_F_DEPRECATED)) {
+					deprecate = 1;
+					ifp->flags |= IFA_F_DEPRECATED;
+				}
+
+				if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
+				    (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
+					next = ifp->tstamp + ifp->valid_lft * HZ;
+
+				spin_unlock(&ifp->lock);
+
+				if (deprecate) {
+					in6_ifa_hold(ifp);
+
+					ipv6_ifa_notify(0, ifp);
+					in6_ifa_put(ifp);
+					goto restart;
+				}
+			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
+				   !(ifp->flags&IFA_F_TENTATIVE)) {
+				unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
+					ifp->idev->cnf.dad_transmits *
+					NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
+
+				if (age >= ifp->prefered_lft - regen_advance) {
+					struct inet6_ifaddr *ifpub = ifp->ifpub;
+					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
+						next = ifp->tstamp + ifp->prefered_lft * HZ;
+					if (!ifp->regen_count && ifpub) {
+						ifp->regen_count++;
+						in6_ifa_hold(ifp);
+						in6_ifa_hold(ifpub);
+						spin_unlock(&ifp->lock);
+
+						spin_lock(&ifpub->lock);
+						ifpub->regen_count = 0;
+						spin_unlock(&ifpub->lock);
+						ipv6_create_tempaddr(ifpub, ifp);
+						in6_ifa_put(ifpub);
+						in6_ifa_put(ifp);
+						goto restart;
+					}
+				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
+					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
+				spin_unlock(&ifp->lock);
+			} else {
+				/* ifp->prefered_lft <= ifp->valid_lft */
+				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
+					next = ifp->tstamp + ifp->prefered_lft * HZ;
+				spin_unlock(&ifp->lock);
+			}
+		}
+	}
+
+	next_sec = round_jiffies_up(next);
+	next_sched = next;
+
+	/* If rounded timeout is accurate enough, accept it. */
+	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
+		next_sched = next_sec;
+
+	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
+	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
+		next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
+
+	ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
+	      now, next, next_sec, next_sched);
+	mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
+	rcu_read_unlock_bh();
+}
+
+static void addrconf_verify_work(struct work_struct *w)
+{
+	rtnl_lock();
+	addrconf_verify_rtnl();
+	rtnl_unlock();
+}
+
+static void addrconf_verify(void)
+{
+	mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
+}
+
+static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
+				     struct in6_addr **peer_pfx)
+{
+	struct in6_addr *pfx = NULL;
+
+	*peer_pfx = NULL;
+
+	if (addr)
+		pfx = nla_data(addr);
+
+	if (local) {
+		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
+			*peer_pfx = pfx;
+		pfx = nla_data(local);
+	}
+
+	return pfx;
+}
+
+static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
+	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
+	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
+	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
+	[IFA_FLAGS]		= { .len = sizeof(u32) },
+};
+
+static int
+inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(skb->sk);
+	struct ifaddrmsg *ifm;
+	struct nlattr *tb[IFA_MAX+1];
+	struct in6_addr *pfx, *peer_pfx;
+	u32 ifa_flags;
+	int err;
+
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+	if (err < 0)
+		return err;
+
+	ifm = nlmsg_data(nlh);
+	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
+	if (!pfx)
+		return -EINVAL;
+
+	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
+
+	/* We ignore other flags so far. */
+	ifa_flags &= IFA_F_MANAGETEMPADDR;
+
+	return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
+			      ifm->ifa_prefixlen);
+}
+
+static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
+			     u32 prefered_lft, u32 valid_lft)
+{
+	u32 flags;
+	clock_t expires;
+	unsigned long timeout;
+	bool was_managetempaddr;
+	bool had_prefixroute;
+
+	ASSERT_RTNL();
+
+	if (!valid_lft || (prefered_lft > valid_lft))
+		return -EINVAL;
+
+	if (ifa_flags & IFA_F_MANAGETEMPADDR &&
+	    (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
+		return -EINVAL;
+
+	timeout = addrconf_timeout_fixup(valid_lft, HZ);
+	if (addrconf_finite_timeout(timeout)) {
+		expires = jiffies_to_clock_t(timeout * HZ);
+		valid_lft = timeout;
+		flags = RTF_EXPIRES;
+	} else {
+		expires = 0;
+		flags = 0;
+		ifa_flags |= IFA_F_PERMANENT;
+	}
+
+	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
+	if (addrconf_finite_timeout(timeout)) {
+		if (timeout == 0)
+			ifa_flags |= IFA_F_DEPRECATED;
+		prefered_lft = timeout;
+	}
+
+	spin_lock_bh(&ifp->lock);
+	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
+	had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
+			  !(ifp->flags & IFA_F_NOPREFIXROUTE);
+	ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
+			IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
+			IFA_F_NOPREFIXROUTE);
+	ifp->flags |= ifa_flags;
+	ifp->tstamp = jiffies;
+	ifp->valid_lft = valid_lft;
+	ifp->prefered_lft = prefered_lft;
+
+	spin_unlock_bh(&ifp->lock);
+	if (!(ifp->flags&IFA_F_TENTATIVE))
+		ipv6_ifa_notify(0, ifp);
+
+	if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
+		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
+				      expires, flags);
+	} else if (had_prefixroute) {
+		enum cleanup_prefix_rt_t action;
+		unsigned long rt_expires;
+
+		write_lock_bh(&ifp->idev->lock);
+		action = check_cleanup_prefix_route(ifp, &rt_expires);
+		write_unlock_bh(&ifp->idev->lock);
+
+		if (action != CLEANUP_PREFIX_RT_NOP) {
+			cleanup_prefix_route(ifp, rt_expires,
+				action == CLEANUP_PREFIX_RT_DEL);
+		}
+	}
+
+	if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
+		if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
+			valid_lft = prefered_lft = 0;
+		manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
+				 !was_managetempaddr, jiffies);
+	}
+
+	addrconf_verify_rtnl();
+
+	return 0;
+}
+
+static int
+inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(skb->sk);
+	struct ifaddrmsg *ifm;
+	struct nlattr *tb[IFA_MAX+1];
+	struct in6_addr *pfx, *peer_pfx;
+	struct inet6_ifaddr *ifa;
+	struct net_device *dev;
+	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
+	u32 ifa_flags;
+	int err;
+
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+	if (err < 0)
+		return err;
+
+	ifm = nlmsg_data(nlh);
+	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
+	if (!pfx)
+		return -EINVAL;
+
+	if (tb[IFA_CACHEINFO]) {
+		struct ifa_cacheinfo *ci;
+
+		ci = nla_data(tb[IFA_CACHEINFO]);
+		valid_lft = ci->ifa_valid;
+		preferred_lft = ci->ifa_prefered;
+	} else {
+		preferred_lft = INFINITY_LIFE_TIME;
+		valid_lft = INFINITY_LIFE_TIME;
+	}
+
+	dev =  __dev_get_by_index(net, ifm->ifa_index);
+	if (!dev)
+		return -ENODEV;
+
+	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
+
+	/* We ignore other flags so far. */
+	ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
+		     IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
+
+	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
+	if (!ifa) {
+		/*
+		 * It would be best to check for !NLM_F_CREATE here but
+		 * userspace already relies on not having to provide this.
+		 */
+		return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
+				      ifm->ifa_prefixlen, ifa_flags,
+				      preferred_lft, valid_lft);
+	}
+
+	if (nlh->nlmsg_flags & NLM_F_EXCL ||
+	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
+		err = -EEXIST;
+	else
+		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
+
+	in6_ifa_put(ifa);
+
+	return err;
+}
+
+static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
+			  u8 scope, int ifindex)
+{
+	struct ifaddrmsg *ifm;
+
+	ifm = nlmsg_data(nlh);
+	ifm->ifa_family = AF_INET6;
+	ifm->ifa_prefixlen = prefixlen;
+	ifm->ifa_flags = flags;
+	ifm->ifa_scope = scope;
+	ifm->ifa_index = ifindex;
+}
+
+static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
+			 unsigned long tstamp, u32 preferred, u32 valid)
+{
+	struct ifa_cacheinfo ci;
+
+	ci.cstamp = cstamp_delta(cstamp);
+	ci.tstamp = cstamp_delta(tstamp);
+	ci.ifa_prefered = preferred;
+	ci.ifa_valid = valid;
+
+	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
+}
+
+static inline int rt_scope(int ifa_scope)
+{
+	if (ifa_scope & IFA_HOST)
+		return RT_SCOPE_HOST;
+	else if (ifa_scope & IFA_LINK)
+		return RT_SCOPE_LINK;
+	else if (ifa_scope & IFA_SITE)
+		return RT_SCOPE_SITE;
+	else
+		return RT_SCOPE_UNIVERSE;
+}
+
+static inline int inet6_ifaddr_msgsize(void)
+{
+	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+	       + nla_total_size(16) /* IFA_LOCAL */
+	       + nla_total_size(16) /* IFA_ADDRESS */
+	       + nla_total_size(sizeof(struct ifa_cacheinfo))
+	       + nla_total_size(4)  /* IFA_FLAGS */;
+}
+
+static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
+			     u32 portid, u32 seq, int event, unsigned int flags)
+{
+	struct nlmsghdr  *nlh;
+	u32 preferred, valid;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
+		      ifa->idev->dev->ifindex);
+
+	if (!((ifa->flags&IFA_F_PERMANENT) &&
+	      (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
+		preferred = ifa->prefered_lft;
+		valid = ifa->valid_lft;
+		if (preferred != INFINITY_LIFE_TIME) {
+			long tval = (jiffies - ifa->tstamp)/HZ;
+			if (preferred > tval)
+				preferred -= tval;
+			else
+				preferred = 0;
+			if (valid != INFINITY_LIFE_TIME) {
+				if (valid > tval)
+					valid -= tval;
+				else
+					valid = 0;
+			}
+		}
+	} else {
+		preferred = INFINITY_LIFE_TIME;
+		valid = INFINITY_LIFE_TIME;
+	}
+
+	if (!ipv6_addr_any(&ifa->peer_addr)) {
+		if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
+		    nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
+			goto error;
+	} else
+		if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
+			goto error;
+
+	if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
+		goto error;
+
+	if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
+		goto error;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+error:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
+				u32 portid, u32 seq, int event, u16 flags)
+{
+	struct nlmsghdr  *nlh;
+	u8 scope = RT_SCOPE_UNIVERSE;
+	int ifindex = ifmca->idev->dev->ifindex;
+
+	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
+		scope = RT_SCOPE_SITE;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
+	if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
+	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
+			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
+		nlmsg_cancel(skb, nlh);
+		return -EMSGSIZE;
+	}
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
+				u32 portid, u32 seq, int event, unsigned int flags)
+{
+	struct nlmsghdr  *nlh;
+	u8 scope = RT_SCOPE_UNIVERSE;
+	int ifindex = ifaca->aca_idev->dev->ifindex;
+
+	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
+		scope = RT_SCOPE_SITE;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
+	if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
+	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
+			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
+		nlmsg_cancel(skb, nlh);
+		return -EMSGSIZE;
+	}
+
+	nlmsg_end(skb, nlh);
+	return 0;
+}
+
+enum addr_type_t {
+	UNICAST_ADDR,
+	MULTICAST_ADDR,
+	ANYCAST_ADDR,
+};
+
+/* called with rcu_read_lock() */
+static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
+			  struct netlink_callback *cb, enum addr_type_t type,
+			  int s_ip_idx, int *p_ip_idx)
+{
+	struct ifmcaddr6 *ifmca;
+	struct ifacaddr6 *ifaca;
+	int err = 1;
+	int ip_idx = *p_ip_idx;
+
+	read_lock_bh(&idev->lock);
+	switch (type) {
+	case UNICAST_ADDR: {
+		struct inet6_ifaddr *ifa;
+
+		/* unicast address incl. temp addr */
+		list_for_each_entry(ifa, &idev->addr_list, if_list) {
+			if (++ip_idx < s_ip_idx)
+				continue;
+			err = inet6_fill_ifaddr(skb, ifa,
+						NETLINK_CB(cb->skb).portid,
+						cb->nlh->nlmsg_seq,
+						RTM_NEWADDR,
+						NLM_F_MULTI);
+			if (err < 0)
+				break;
+			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+		}
+		break;
+	}
+	case MULTICAST_ADDR:
+		/* multicast address */
+		for (ifmca = idev->mc_list; ifmca;
+		     ifmca = ifmca->next, ip_idx++) {
+			if (ip_idx < s_ip_idx)
+				continue;
+			err = inet6_fill_ifmcaddr(skb, ifmca,
+						  NETLINK_CB(cb->skb).portid,
+						  cb->nlh->nlmsg_seq,
+						  RTM_GETMULTICAST,
+						  NLM_F_MULTI);
+			if (err < 0)
+				break;
+		}
+		break;
+	case ANYCAST_ADDR:
+		/* anycast address */
+		for (ifaca = idev->ac_list; ifaca;
+		     ifaca = ifaca->aca_next, ip_idx++) {
+			if (ip_idx < s_ip_idx)
+				continue;
+			err = inet6_fill_ifacaddr(skb, ifaca,
+						  NETLINK_CB(cb->skb).portid,
+						  cb->nlh->nlmsg_seq,
+						  RTM_GETANYCAST,
+						  NLM_F_MULTI);
+			if (err < 0)
+				break;
+		}
+		break;
+	default:
+		break;
+	}
+	read_unlock_bh(&idev->lock);
+	*p_ip_idx = ip_idx;
+	return err;
+}
+
+static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
+			   enum addr_type_t type)
+{
+	struct net *net = sock_net(skb->sk);
+	int h, s_h;
+	int idx, ip_idx;
+	int s_idx, s_ip_idx;
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct hlist_head *head;
+
+	s_h = cb->args[0];
+	s_idx = idx = cb->args[1];
+	s_ip_idx = ip_idx = cb->args[2];
+
+	rcu_read_lock();
+	cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
+	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+		idx = 0;
+		head = &net->dev_index_head[h];
+		hlist_for_each_entry_rcu(dev, head, index_hlist) {
+			if (idx < s_idx)
+				goto cont;
+			if (h > s_h || idx > s_idx)
+				s_ip_idx = 0;
+			ip_idx = 0;
+			idev = __in6_dev_get(dev);
+			if (!idev)
+				goto cont;
+
+			if (in6_dump_addrs(idev, skb, cb, type,
+					   s_ip_idx, &ip_idx) < 0)
+				goto done;
+cont:
+			idx++;
+		}
+	}
+done:
+	rcu_read_unlock();
+	cb->args[0] = h;
+	cb->args[1] = idx;
+	cb->args[2] = ip_idx;
+
+	return skb->len;
+}
+
+static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	enum addr_type_t type = UNICAST_ADDR;
+
+	return inet6_dump_addr(skb, cb, type);
+}
+
+static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	enum addr_type_t type = MULTICAST_ADDR;
+
+	return inet6_dump_addr(skb, cb, type);
+}
+
+
+static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	enum addr_type_t type = ANYCAST_ADDR;
+
+	return inet6_dump_addr(skb, cb, type);
+}
+
+static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
+{
+	struct net *net = sock_net(in_skb->sk);
+	struct ifaddrmsg *ifm;
+	struct nlattr *tb[IFA_MAX+1];
+	struct in6_addr *addr = NULL, *peer;
+	struct net_device *dev = NULL;
+	struct inet6_ifaddr *ifa;
+	struct sk_buff *skb;
+	int err;
+
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
+	if (err < 0)
+		goto errout;
+
+	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
+	if (!addr) {
+		err = -EINVAL;
+		goto errout;
+	}
+
+	ifm = nlmsg_data(nlh);
+	if (ifm->ifa_index)
+		dev = __dev_get_by_index(net, ifm->ifa_index);
+
+	ifa = ipv6_get_ifaddr(net, addr, dev, 1);
+	if (!ifa) {
+		err = -EADDRNOTAVAIL;
+		goto errout;
+	}
+
+	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
+	if (!skb) {
+		err = -ENOBUFS;
+		goto errout_ifa;
+	}
+
+	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
+				nlh->nlmsg_seq, RTM_NEWADDR, 0);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout_ifa;
+	}
+	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout_ifa:
+	in6_ifa_put(ifa);
+errout:
+	return err;
+}
+
+static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
+{
+	struct sk_buff *skb;
+	struct net *net = dev_net(ifa->idev->dev);
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
+	return;
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
+}
+
+static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
+				__s32 *array, int bytes)
+{
+	BUG_ON(bytes < (DEVCONF_MAX * 4));
+
+	memset(array, 0, bytes);
+	array[DEVCONF_FORWARDING] = cnf->forwarding;
+	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
+	array[DEVCONF_MTU6] = cnf->mtu6;
+	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
+	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
+	array[DEVCONF_AUTOCONF] = cnf->autoconf;
+	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
+	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
+	array[DEVCONF_RTR_SOLICIT_INTERVAL] =
+		jiffies_to_msecs(cnf->rtr_solicit_interval);
+	array[DEVCONF_RTR_SOLICIT_DELAY] =
+		jiffies_to_msecs(cnf->rtr_solicit_delay);
+	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
+	array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
+		jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
+	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
+		jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
+	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
+	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
+	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
+	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
+	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
+	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
+	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
+	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
+#ifdef CONFIG_IPV6_ROUTER_PREF
+	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
+	array[DEVCONF_RTR_PROBE_INTERVAL] =
+		jiffies_to_msecs(cnf->rtr_probe_interval);
+#ifdef CONFIG_IPV6_ROUTE_INFO
+	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
+#endif
+#endif
+	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
+	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
+	array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
+#endif
+#ifdef CONFIG_IPV6_MROUTE
+	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
+#endif
+	array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
+	array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
+	array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
+	array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
+	array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
+	array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
+	array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
+	/* we omit DEVCONF_STABLE_SECRET for now */
+}
+
+static inline size_t inet6_ifla6_size(void)
+{
+	return nla_total_size(4) /* IFLA_INET6_FLAGS */
+	     + nla_total_size(sizeof(struct ifla_cacheinfo))
+	     + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
+	     + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
+	     + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
+	     + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
+}
+
+static inline size_t inet6_if_nlmsg_size(void)
+{
+	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+	       + nla_total_size(4) /* IFLA_MTU */
+	       + nla_total_size(4) /* IFLA_LINK */
+	       + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
+}
+
+static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
+				      int items, int bytes)
+{
+	int i;
+	int pad = bytes - sizeof(u64) * items;
+	BUG_ON(pad < 0);
+
+	/* Use put_unaligned() because stats may not be aligned for u64. */
+	put_unaligned(items, &stats[0]);
+	for (i = 1; i < items; i++)
+		put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
+
+	memset(&stats[items], 0, pad);
+}
+
+static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
+				      int items, int bytes, size_t syncpoff)
+{
+	int i;
+	int pad = bytes - sizeof(u64) * items;
+	BUG_ON(pad < 0);
+
+	/* Use put_unaligned() because stats may not be aligned for u64. */
+	put_unaligned(items, &stats[0]);
+	for (i = 1; i < items; i++)
+		put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
+
+	memset(&stats[items], 0, pad);
+}
+
+static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
+			     int bytes)
+{
+	switch (attrtype) {
+	case IFLA_INET6_STATS:
+		__snmp6_fill_stats64(stats, idev->stats.ipv6,
+				     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
+		break;
+	case IFLA_INET6_ICMP6STATS:
+		__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
+		break;
+	}
+}
+
+static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
+{
+	struct nlattr *nla;
+	struct ifla_cacheinfo ci;
+
+	if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
+		goto nla_put_failure;
+	ci.max_reasm_len = IPV6_MAXPLEN;
+	ci.tstamp = cstamp_delta(idev->tstamp);
+	ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
+	ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
+	if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
+		goto nla_put_failure;
+	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
+	if (!nla)
+		goto nla_put_failure;
+	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
+
+	/* XXX - MC not implemented */
+
+	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
+	if (!nla)
+		goto nla_put_failure;
+	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
+
+	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
+	if (!nla)
+		goto nla_put_failure;
+	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
+
+	nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
+	if (!nla)
+		goto nla_put_failure;
+
+	if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
+		goto nla_put_failure;
+
+	read_lock_bh(&idev->lock);
+	memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
+	read_unlock_bh(&idev->lock);
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static size_t inet6_get_link_af_size(const struct net_device *dev)
+{
+	if (!__in6_dev_get(dev))
+		return 0;
+
+	return inet6_ifla6_size();
+}
+
+static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
+{
+	struct inet6_dev *idev = __in6_dev_get(dev);
+
+	if (!idev)
+		return -ENODATA;
+
+	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
+{
+	struct inet6_ifaddr *ifp;
+	struct net_device *dev = idev->dev;
+	bool update_rs = false;
+	struct in6_addr ll_addr;
+
+	ASSERT_RTNL();
+
+	if (!token)
+		return -EINVAL;
+	if (ipv6_addr_any(token))
+		return -EINVAL;
+	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
+		return -EINVAL;
+	if (!ipv6_accept_ra(idev))
+		return -EINVAL;
+	if (idev->cnf.rtr_solicits <= 0)
+		return -EINVAL;
+
+	write_lock_bh(&idev->lock);
+
+	BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
+	memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
+
+	write_unlock_bh(&idev->lock);
+
+	if (!idev->dead && (idev->if_flags & IF_READY) &&
+	    !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
+			     IFA_F_OPTIMISTIC)) {
+
+		/* If we're not ready, then normal ifup will take care
+		 * of this. Otherwise, we need to request our rs here.
+		 */
+		ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
+		update_rs = true;
+	}
+
+	write_lock_bh(&idev->lock);
+
+	if (update_rs) {
+		idev->if_flags |= IF_RS_SENT;
+		idev->rs_probes = 1;
+		addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
+	}
+
+	/* Well, that's kinda nasty ... */
+	list_for_each_entry(ifp, &idev->addr_list, if_list) {
+		spin_lock(&ifp->lock);
+		if (ifp->tokenized) {
+			ifp->valid_lft = 0;
+			ifp->prefered_lft = 0;
+		}
+		spin_unlock(&ifp->lock);
+	}
+
+	write_unlock_bh(&idev->lock);
+	inet6_ifinfo_notify(RTM_NEWLINK, idev);
+	addrconf_verify_rtnl();
+	return 0;
+}
+
+static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
+	[IFLA_INET6_ADDR_GEN_MODE]	= { .type = NLA_U8 },
+	[IFLA_INET6_TOKEN]		= { .len = sizeof(struct in6_addr) },
+};
+
+static int inet6_validate_link_af(const struct net_device *dev,
+				  const struct nlattr *nla)
+{
+	struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+	if (dev && !__in6_dev_get(dev))
+		return -EAFNOSUPPORT;
+
+	return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
+}
+
+static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
+{
+	int err = -EINVAL;
+	struct inet6_dev *idev = __in6_dev_get(dev);
+	struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+	if (!idev)
+		return -EAFNOSUPPORT;
+
+	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
+		BUG();
+
+	if (tb[IFLA_INET6_TOKEN]) {
+		err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
+		if (err)
+			return err;
+	}
+
+	if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
+		u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
+
+		if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
+		    mode != IN6_ADDR_GEN_MODE_NONE &&
+		    mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
+			return -EINVAL;
+
+		if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
+		    !idev->cnf.stable_secret.initialized &&
+		    !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
+			return -EINVAL;
+
+		idev->addr_gen_mode = mode;
+		err = 0;
+	}
+
+	return err;
+}
+
+static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
+			     u32 portid, u32 seq, int event, unsigned int flags)
+{
+	struct net_device *dev = idev->dev;
+	struct ifinfomsg *hdr;
+	struct nlmsghdr *nlh;
+	void *protoinfo;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	hdr = nlmsg_data(nlh);
+	hdr->ifi_family = AF_INET6;
+	hdr->__ifi_pad = 0;
+	hdr->ifi_type = dev->type;
+	hdr->ifi_index = dev->ifindex;
+	hdr->ifi_flags = dev_get_flags(dev);
+	hdr->ifi_change = 0;
+
+	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
+	    (dev->addr_len &&
+	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
+	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
+	    (dev->ifindex != dev_get_iflink(dev) &&
+	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
+		goto nla_put_failure;
+	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
+	if (!protoinfo)
+		goto nla_put_failure;
+
+	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
+		goto nla_put_failure;
+
+	nla_nest_end(skb, protoinfo);
+	nlmsg_end(skb, nlh);
+	return 0;
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	int h, s_h;
+	int idx = 0, s_idx;
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct hlist_head *head;
+
+	s_h = cb->args[0];
+	s_idx = cb->args[1];
+
+	rcu_read_lock();
+	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+		idx = 0;
+		head = &net->dev_index_head[h];
+		hlist_for_each_entry_rcu(dev, head, index_hlist) {
+			if (idx < s_idx)
+				goto cont;
+			idev = __in6_dev_get(dev);
+			if (!idev)
+				goto cont;
+			if (inet6_fill_ifinfo(skb, idev,
+					      NETLINK_CB(cb->skb).portid,
+					      cb->nlh->nlmsg_seq,
+					      RTM_NEWLINK, NLM_F_MULTI) < 0)
+				goto out;
+cont:
+			idx++;
+		}
+	}
+out:
+	rcu_read_unlock();
+	cb->args[1] = idx;
+	cb->args[0] = h;
+
+	return skb->len;
+}
+
+void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
+{
+	struct sk_buff *skb;
+	struct net *net = dev_net(idev->dev);
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
+	return;
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
+}
+
+static inline size_t inet6_prefix_nlmsg_size(void)
+{
+	return NLMSG_ALIGN(sizeof(struct prefixmsg))
+	       + nla_total_size(sizeof(struct in6_addr))
+	       + nla_total_size(sizeof(struct prefix_cacheinfo));
+}
+
+static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
+			     struct prefix_info *pinfo, u32 portid, u32 seq,
+			     int event, unsigned int flags)
+{
+	struct prefixmsg *pmsg;
+	struct nlmsghdr *nlh;
+	struct prefix_cacheinfo	ci;
+
+	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	pmsg = nlmsg_data(nlh);
+	pmsg->prefix_family = AF_INET6;
+	pmsg->prefix_pad1 = 0;
+	pmsg->prefix_pad2 = 0;
+	pmsg->prefix_ifindex = idev->dev->ifindex;
+	pmsg->prefix_len = pinfo->prefix_len;
+	pmsg->prefix_type = pinfo->type;
+	pmsg->prefix_pad3 = 0;
+	pmsg->prefix_flags = 0;
+	if (pinfo->onlink)
+		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
+	if (pinfo->autoconf)
+		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
+
+	if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
+		goto nla_put_failure;
+	ci.preferred_time = ntohl(pinfo->prefered);
+	ci.valid_time = ntohl(pinfo->valid);
+	if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
+		goto nla_put_failure;
+	nlmsg_end(skb, nlh);
+	return 0;
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+static void inet6_prefix_notify(int event, struct inet6_dev *idev,
+			 struct prefix_info *pinfo)
+{
+	struct sk_buff *skb;
+	struct net *net = dev_net(idev->dev);
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
+	if (err < 0) {
+		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
+		WARN_ON(err == -EMSGSIZE);
+		kfree_skb(skb);
+		goto errout;
+	}
+	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
+	return;
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
+}
+
+static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
+{
+	struct net *net = dev_net(ifp->idev->dev);
+
+	if (event)
+		ASSERT_RTNL();
+
+	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
+
+	switch (event) {
+	case RTM_NEWADDR:
+		/*
+		 * If the address was optimistic
+		 * we inserted the route at the start of
+		 * our DAD process, so we don't need
+		 * to do it again
+		 */
+		if (!(ifp->rt->rt6i_node))
+			ip6_ins_rt(ifp->rt);
+		if (ifp->idev->cnf.forwarding)
+			addrconf_join_anycast(ifp);
+		if (!ipv6_addr_any(&ifp->peer_addr))
+			addrconf_prefix_route(&ifp->peer_addr, 128,
+					      ifp->idev->dev, 0, 0);
+		break;
+	case RTM_DELADDR:
+		if (ifp->idev->cnf.forwarding)
+			addrconf_leave_anycast(ifp);
+		addrconf_leave_solict(ifp->idev, &ifp->addr);
+		if (!ipv6_addr_any(&ifp->peer_addr)) {
+			struct rt6_info *rt;
+
+			rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
+						       ifp->idev->dev, 0, 0);
+			if (rt && ip6_del_rt(rt))
+				dst_free(&rt->dst);
+		}
+		dst_hold(&ifp->rt->dst);
+
+		if (ip6_del_rt(ifp->rt))
+			dst_free(&ifp->rt->dst);
+
+		rt_genid_bump_ipv6(net);
+		break;
+	}
+	atomic_inc(&net->ipv6.dev_addr_genid);
+}
+
+static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
+{
+	rcu_read_lock_bh();
+	if (likely(ifp->idev->dead == 0))
+		__ipv6_ifa_notify(event, ifp);
+	rcu_read_unlock_bh();
+}
+
+#ifdef CONFIG_SYSCTL
+
+static
+int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
+			   void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	int *valp = ctl->data;
+	int val = *valp;
+	loff_t pos = *ppos;
+	struct ctl_table lctl;
+	int ret;
+
+	/*
+	 * ctl->data points to idev->cnf.forwarding, we should
+	 * not modify it until we get the rtnl lock.
+	 */
+	lctl = *ctl;
+	lctl.data = &val;
+
+	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+	if (write)
+		ret = addrconf_fixup_forwarding(ctl, valp, val);
+	if (ret)
+		*ppos = pos;
+	return ret;
+}
+
+static
+int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
+			void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	struct inet6_dev *idev = ctl->extra1;
+	int min_mtu = IPV6_MIN_MTU;
+	struct ctl_table lctl;
+
+	lctl = *ctl;
+	lctl.extra1 = &min_mtu;
+	lctl.extra2 = idev ? &idev->dev->mtu : NULL;
+
+	return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
+}
+
+static void dev_disable_change(struct inet6_dev *idev)
+{
+	struct netdev_notifier_info info;
+
+	if (!idev || !idev->dev)
+		return;
+
+	netdev_notifier_info_init(&info, idev->dev);
+	if (idev->cnf.disable_ipv6)
+		addrconf_notify(NULL, NETDEV_DOWN, &info);
+	else
+		addrconf_notify(NULL, NETDEV_UP, &info);
+}
+
+static void addrconf_disable_change(struct net *net, __s32 newf)
+{
+	struct net_device *dev;
+	struct inet6_dev *idev;
+
+	rcu_read_lock();
+	for_each_netdev_rcu(net, dev) {
+		idev = __in6_dev_get(dev);
+		if (idev) {
+			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
+			idev->cnf.disable_ipv6 = newf;
+			if (changed)
+				dev_disable_change(idev);
+		}
+	}
+	rcu_read_unlock();
+}
+
+static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
+{
+	struct net *net;
+	int old;
+
+	if (!rtnl_trylock())
+		return restart_syscall();
+
+	net = (struct net *)table->extra2;
+	old = *p;
+	*p = newf;
+
+	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
+		rtnl_unlock();
+		return 0;
+	}
+
+	if (p == &net->ipv6.devconf_all->disable_ipv6) {
+		net->ipv6.devconf_dflt->disable_ipv6 = newf;
+		addrconf_disable_change(net, newf);
+	} else if ((!newf) ^ (!old))
+		dev_disable_change((struct inet6_dev *)table->extra1);
+
+	rtnl_unlock();
+	return 0;
+}
+
+static
+int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
+			    void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	int *valp = ctl->data;
+	int val = *valp;
+	loff_t pos = *ppos;
+	struct ctl_table lctl;
+	int ret;
+
+	/*
+	 * ctl->data points to idev->cnf.disable_ipv6, we should
+	 * not modify it until we get the rtnl lock.
+	 */
+	lctl = *ctl;
+	lctl.data = &val;
+
+	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
+
+	if (write)
+		ret = addrconf_disable_ipv6(ctl, valp, val);
+	if (ret)
+		*ppos = pos;
+	return ret;
+}
+
+static
+int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
+			      void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	int *valp = ctl->data;
+	int ret;
+	int old, new;
+
+	old = *valp;
+	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
+	new = *valp;
+
+	if (write && old != new) {
+		struct net *net = ctl->extra2;
+
+		if (!rtnl_trylock())
+			return restart_syscall();
+
+		if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
+			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
+						     NETCONFA_IFINDEX_DEFAULT,
+						     net->ipv6.devconf_dflt);
+		else if (valp == &net->ipv6.devconf_all->proxy_ndp)
+			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
+						     NETCONFA_IFINDEX_ALL,
+						     net->ipv6.devconf_all);
+		else {
+			struct inet6_dev *idev = ctl->extra1;
+
+			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
+						     idev->dev->ifindex,
+						     &idev->cnf);
+		}
+		rtnl_unlock();
+	}
+
+	return ret;
+}
+
+static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
+					 void __user *buffer, size_t *lenp,
+					 loff_t *ppos)
+{
+	int err;
+	struct in6_addr addr;
+	char str[IPV6_MAX_STRLEN];
+	struct ctl_table lctl = *ctl;
+	struct net *net = ctl->extra2;
+	struct ipv6_stable_secret *secret = ctl->data;
+
+	if (&net->ipv6.devconf_all->stable_secret == ctl->data)
+		return -EIO;
+
+	lctl.maxlen = IPV6_MAX_STRLEN;
+	lctl.data = str;
+
+	if (!rtnl_trylock())
+		return restart_syscall();
+
+	if (!write && !secret->initialized) {
+		err = -EIO;
+		goto out;
+	}
+
+	if (!write) {
+		err = snprintf(str, sizeof(str), "%pI6",
+			       &secret->secret);
+		if (err >= sizeof(str)) {
+			err = -EIO;
+			goto out;
+		}
+	}
+
+	err = proc_dostring(&lctl, write, buffer, lenp, ppos);
+	if (err || !write)
+		goto out;
+
+	if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
+		err = -EIO;
+		goto out;
+	}
+
+	secret->initialized = true;
+	secret->secret = addr;
+
+	if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
+		struct net_device *dev;
+
+		for_each_netdev(net, dev) {
+			struct inet6_dev *idev = __in6_dev_get(dev);
+
+			if (idev) {
+				idev->addr_gen_mode =
+					IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+			}
+		}
+	} else {
+		struct inet6_dev *idev = ctl->extra1;
+
+		idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
+	}
+
+out:
+	rtnl_unlock();
+
+	return err;
+}
+
+static struct addrconf_sysctl_table
+{
+	struct ctl_table_header *sysctl_header;
+	struct ctl_table addrconf_vars[DEVCONF_MAX+1];
+} addrconf_sysctl __read_mostly = {
+	.sysctl_header = NULL,
+	.addrconf_vars = {
+		{
+			.procname	= "forwarding",
+			.data		= &ipv6_devconf.forwarding,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= addrconf_sysctl_forward,
+		},
+		{
+			.procname	= "hop_limit",
+			.data		= &ipv6_devconf.hop_limit,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "mtu",
+			.data		= &ipv6_devconf.mtu6,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= addrconf_sysctl_mtu,
+		},
+		{
+			.procname	= "accept_ra",
+			.data		= &ipv6_devconf.accept_ra,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "accept_redirects",
+			.data		= &ipv6_devconf.accept_redirects,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "autoconf",
+			.data		= &ipv6_devconf.autoconf,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "dad_transmits",
+			.data		= &ipv6_devconf.dad_transmits,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "router_solicitations",
+			.data		= &ipv6_devconf.rtr_solicits,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "router_solicitation_interval",
+			.data		= &ipv6_devconf.rtr_solicit_interval,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec_jiffies,
+		},
+		{
+			.procname	= "router_solicitation_delay",
+			.data		= &ipv6_devconf.rtr_solicit_delay,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec_jiffies,
+		},
+		{
+			.procname	= "force_mld_version",
+			.data		= &ipv6_devconf.force_mld_version,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "mldv1_unsolicited_report_interval",
+			.data		=
+				&ipv6_devconf.mldv1_unsolicited_report_interval,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec_ms_jiffies,
+		},
+		{
+			.procname	= "mldv2_unsolicited_report_interval",
+			.data		=
+				&ipv6_devconf.mldv2_unsolicited_report_interval,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec_ms_jiffies,
+		},
+		{
+			.procname	= "use_tempaddr",
+			.data		= &ipv6_devconf.use_tempaddr,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "temp_valid_lft",
+			.data		= &ipv6_devconf.temp_valid_lft,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "temp_prefered_lft",
+			.data		= &ipv6_devconf.temp_prefered_lft,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "regen_max_retry",
+			.data		= &ipv6_devconf.regen_max_retry,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "max_desync_factor",
+			.data		= &ipv6_devconf.max_desync_factor,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "max_addresses",
+			.data		= &ipv6_devconf.max_addresses,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "accept_ra_defrtr",
+			.data		= &ipv6_devconf.accept_ra_defrtr,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "accept_ra_pinfo",
+			.data		= &ipv6_devconf.accept_ra_pinfo,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+#ifdef CONFIG_IPV6_ROUTER_PREF
+		{
+			.procname	= "accept_ra_rtr_pref",
+			.data		= &ipv6_devconf.accept_ra_rtr_pref,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "router_probe_interval",
+			.data		= &ipv6_devconf.rtr_probe_interval,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec_jiffies,
+		},
+#ifdef CONFIG_IPV6_ROUTE_INFO
+		{
+			.procname	= "accept_ra_rt_info_max_plen",
+			.data		= &ipv6_devconf.accept_ra_rt_info_max_plen,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+#endif
+#endif
+		{
+			.procname	= "proxy_ndp",
+			.data		= &ipv6_devconf.proxy_ndp,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= addrconf_sysctl_proxy_ndp,
+		},
+		{
+			.procname	= "accept_source_route",
+			.data		= &ipv6_devconf.accept_source_route,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
+		{
+			.procname       = "optimistic_dad",
+			.data           = &ipv6_devconf.optimistic_dad,
+			.maxlen         = sizeof(int),
+			.mode           = 0644,
+			.proc_handler   = proc_dointvec,
+
+		},
+		{
+			.procname       = "use_optimistic",
+			.data           = &ipv6_devconf.use_optimistic,
+			.maxlen         = sizeof(int),
+			.mode           = 0644,
+			.proc_handler   = proc_dointvec,
+
+		},
+#endif
+#ifdef CONFIG_IPV6_MROUTE
+		{
+			.procname	= "mc_forwarding",
+			.data		= &ipv6_devconf.mc_forwarding,
+			.maxlen		= sizeof(int),
+			.mode		= 0444,
+			.proc_handler	= proc_dointvec,
+		},
+#endif
+		{
+			.procname	= "disable_ipv6",
+			.data		= &ipv6_devconf.disable_ipv6,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= addrconf_sysctl_disable,
+		},
+		{
+			.procname	= "accept_dad",
+			.data		= &ipv6_devconf.accept_dad,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname       = "force_tllao",
+			.data           = &ipv6_devconf.force_tllao,
+			.maxlen         = sizeof(int),
+			.mode           = 0644,
+			.proc_handler   = proc_dointvec
+		},
+		{
+			.procname       = "ndisc_notify",
+			.data           = &ipv6_devconf.ndisc_notify,
+			.maxlen         = sizeof(int),
+			.mode           = 0644,
+			.proc_handler   = proc_dointvec
+		},
+		{
+			.procname	= "suppress_frag_ndisc",
+			.data		= &ipv6_devconf.suppress_frag_ndisc,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec
+		},
+		{
+			.procname	= "accept_ra_from_local",
+			.data		= &ipv6_devconf.accept_ra_from_local,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "accept_ra_mtu",
+			.data		= &ipv6_devconf.accept_ra_mtu,
+			.maxlen		= sizeof(int),
+			.mode		= 0644,
+			.proc_handler	= proc_dointvec,
+		},
+		{
+			.procname	= "stable_secret",
+			.data		= &ipv6_devconf.stable_secret,
+			.maxlen		= IPV6_MAX_STRLEN,
+			.mode		= 0600,
+			.proc_handler	= addrconf_sysctl_stable_secret,
+		},
+		{
+			/* sentinel */
+		}
+	},
+};
+
+static int __addrconf_sysctl_register(struct net *net, char *dev_name,
+		struct inet6_dev *idev, struct ipv6_devconf *p)
+{
+	int i;
+	struct addrconf_sysctl_table *t;
+	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
+
+	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
+	if (!t)
+		goto out;
+
+	for (i = 0; t->addrconf_vars[i].data; i++) {
+		t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
+		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
+		t->addrconf_vars[i].extra2 = net;
+	}
+
+	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
+
+	t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
+	if (!t->sysctl_header)
+		goto free;
+
+	p->sysctl = t;
+	return 0;
+
+free:
+	kfree(t);
+out:
+	return -ENOBUFS;
+}
+
+static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
+{
+	struct addrconf_sysctl_table *t;
+
+	if (!p->sysctl)
+		return;
+
+	t = p->sysctl;
+	p->sysctl = NULL;
+	unregister_net_sysctl_table(t->sysctl_header);
+	kfree(t);
+}
+
+static int addrconf_sysctl_register(struct inet6_dev *idev)
+{
+	int err;
+
+	if (!sysctl_dev_name_is_allowed(idev->dev->name))
+		return -EINVAL;
+
+	err = neigh_sysctl_register(idev->dev, idev->nd_parms,
+				    &ndisc_ifinfo_sysctl_change);
+	if (err)
+		return err;
+	err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
+					 idev, &idev->cnf);
+	if (err)
+		neigh_sysctl_unregister(idev->nd_parms);
+
+	return err;
+}
+
+static void addrconf_sysctl_unregister(struct inet6_dev *idev)
+{
+	__addrconf_sysctl_unregister(&idev->cnf);
+	neigh_sysctl_unregister(idev->nd_parms);
+}
+
+
+#endif
+
+static int __net_init addrconf_init_net(struct net *net)
+{
+	int err = -ENOMEM;
+	struct ipv6_devconf *all, *dflt;
+
+	all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
+	if (!all)
+		goto err_alloc_all;
+
+	dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
+	if (!dflt)
+		goto err_alloc_dflt;
+
+	/* these will be inherited by all namespaces */
+	dflt->autoconf = ipv6_defaults.autoconf;
+	dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
+
+	dflt->stable_secret.initialized = false;
+	all->stable_secret.initialized = false;
+
+	net->ipv6.devconf_all = all;
+	net->ipv6.devconf_dflt = dflt;
+
+#ifdef CONFIG_SYSCTL
+	err = __addrconf_sysctl_register(net, "all", NULL, all);
+	if (err < 0)
+		goto err_reg_all;
+
+	err = __addrconf_sysctl_register(net, "default", NULL, dflt);
+	if (err < 0)
+		goto err_reg_dflt;
+#endif
+	return 0;
+
+#ifdef CONFIG_SYSCTL
+err_reg_dflt:
+	__addrconf_sysctl_unregister(all);
+err_reg_all:
+	kfree(dflt);
+#endif
+err_alloc_dflt:
+	kfree(all);
+err_alloc_all:
+	return err;
+}
+
+static void __net_exit addrconf_exit_net(struct net *net)
+{
+#ifdef CONFIG_SYSCTL
+	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
+	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
+#endif
+	kfree(net->ipv6.devconf_dflt);
+	kfree(net->ipv6.devconf_all);
+}
+
+static struct pernet_operations addrconf_ops = {
+	.init = addrconf_init_net,
+	.exit = addrconf_exit_net,
+};
+
+static struct rtnl_af_ops inet6_ops __read_mostly = {
+	.family		  = AF_INET6,
+	.fill_link_af	  = inet6_fill_link_af,
+	.get_link_af_size = inet6_get_link_af_size,
+	.validate_link_af = inet6_validate_link_af,
+	.set_link_af	  = inet6_set_link_af,
+};
+
+/*
+ *	Init / cleanup code
+ */
+
+int __init addrconf_init(void)
+{
+	struct inet6_dev *idev;
+	int i, err;
+
+	err = ipv6_addr_label_init();
+	if (err < 0) {
+		pr_crit("%s: cannot initialize default policy table: %d\n",
+			__func__, err);
+		goto out;
+	}
+
+	err = register_pernet_subsys(&addrconf_ops);
+	if (err < 0)
+		goto out_addrlabel;
+
+	addrconf_wq = create_workqueue("ipv6_addrconf");
+	if (!addrconf_wq) {
+		err = -ENOMEM;
+		goto out_nowq;
+	}
+
+	/* The addrconf netdev notifier requires that loopback_dev
+	 * has it's ipv6 private information allocated and setup
+	 * before it can bring up and give link-local addresses
+	 * to other devices which are up.
+	 *
+	 * Unfortunately, loopback_dev is not necessarily the first
+	 * entry in the global dev_base list of net devices.  In fact,
+	 * it is likely to be the very last entry on that list.
+	 * So this causes the notifier registry below to try and
+	 * give link-local addresses to all devices besides loopback_dev
+	 * first, then loopback_dev, which cases all the non-loopback_dev
+	 * devices to fail to get a link-local address.
+	 *
+	 * So, as a temporary fix, allocate the ipv6 structure for
+	 * loopback_dev first by hand.
+	 * Longer term, all of the dependencies ipv6 has upon the loopback
+	 * device and it being up should be removed.
+	 */
+	rtnl_lock();
+	idev = ipv6_add_dev(init_net.loopback_dev);
+	rtnl_unlock();
+	if (IS_ERR(idev)) {
+		err = PTR_ERR(idev);
+		goto errlo;
+	}
+
+	for (i = 0; i < IN6_ADDR_HSIZE; i++)
+		INIT_HLIST_HEAD(&inet6_addr_lst[i]);
+
+	register_netdevice_notifier(&ipv6_dev_notf);
+
+	addrconf_verify();
+
+	rtnl_af_register(&inet6_ops);
+
+	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
+			      NULL);
+	if (err < 0)
+		goto errout;
+
+	/* Only the first call to __rtnl_register can fail */
+	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
+	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
+	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
+			inet6_dump_ifaddr, NULL);
+	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
+			inet6_dump_ifmcaddr, NULL);
+	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
+			inet6_dump_ifacaddr, NULL);
+	__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
+			inet6_netconf_dump_devconf, NULL);
+
+	ipv6_addr_label_rtnl_register();
+
+	return 0;
+errout:
+	rtnl_af_unregister(&inet6_ops);
+	unregister_netdevice_notifier(&ipv6_dev_notf);
+errlo:
+	destroy_workqueue(addrconf_wq);
+out_nowq:
+	unregister_pernet_subsys(&addrconf_ops);
+out_addrlabel:
+	ipv6_addr_label_cleanup();
+out:
+	return err;
+}
+
+void addrconf_cleanup(void)
+{
+	struct net_device *dev;
+	int i;
+
+	unregister_netdevice_notifier(&ipv6_dev_notf);
+	unregister_pernet_subsys(&addrconf_ops);
+	ipv6_addr_label_cleanup();
+
+	rtnl_lock();
+
+	__rtnl_af_unregister(&inet6_ops);
+
+	/* clean dev list */
+	for_each_netdev(&init_net, dev) {
+		if (__in6_dev_get(dev) == NULL)
+			continue;
+		addrconf_ifdown(dev, 1);
+	}
+	addrconf_ifdown(init_net.loopback_dev, 2);
+
+	/*
+	 *	Check hash table.
+	 */
+	spin_lock_bh(&addrconf_hash_lock);
+	for (i = 0; i < IN6_ADDR_HSIZE; i++)
+		WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
+	spin_unlock_bh(&addrconf_hash_lock);
+	cancel_delayed_work(&addr_chk_work);
+	rtnl_unlock();
+
+	destroy_workqueue(addrconf_wq);
+}