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addrconf.c

/*
 *    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.
 */

#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/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>
#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 <net/net_namespace.h>
#include <net/sock.h>
#include <net/snmp.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>

#ifdef CONFIG_IPV6_PRIVACY
#include <linux/random.h>
#endif

#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>

/* Set to 3 to get tracing... */
#define ACONF_DEBUG 2

#if ACONF_DEBUG >= 3
#define ADBG(x) printk x
#else
#define ADBG(x)
#endif

#define     INFINITY_LIFE_TIME      0xFFFFFFFF
#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))

#ifdef CONFIG_SYSCTL
static void addrconf_sysctl_register(struct inet6_dev *idev);
static void addrconf_sysctl_unregister(struct inet6_dev *idev);
#else
static inline void addrconf_sysctl_register(struct inet6_dev *idev)
{
}

static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
}
#endif

#ifdef CONFIG_IPV6_PRIVACY
static int __ipv6_regen_rndid(struct inet6_dev *idev);
static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
static void ipv6_regen_rndid(unsigned long data);

static int desync_factor = MAX_DESYNC_FACTOR * HZ;
#endif

static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
static int ipv6_count_addresses(struct inet6_dev *idev);

/*
 *    Configured unicast address hash table
 */
static struct inet6_ifaddr          *inet6_addr_lst[IN6_ADDR_HSIZE];
static DEFINE_RWLOCK(addrconf_hash_lock);

static void addrconf_verify(unsigned long);

static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
static DEFINE_SPINLOCK(addrconf_verify_lock);

static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);

static int addrconf_ifdown(struct net_device *dev, int how);

static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
static void addrconf_dad_timer(unsigned long data);
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 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
                        struct net_device *dev);

static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);

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,
      .dad_transmits          = 1,
      .rtr_solicits           = MAX_RTR_SOLICITATIONS,
      .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
      .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
#ifdef CONFIG_IPV6_PRIVACY
      .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,
#endif
      .max_addresses          = IPV6_MAX_ADDRESSES,
      .accept_ra_defrtr = 1,
      .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,
};

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,
      .dad_transmits          = 1,
      .rtr_solicits           = MAX_RTR_SOLICITATIONS,
      .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
      .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
#ifdef CONFIG_IPV6_PRIVACY
      .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,
#endif
      .max_addresses          = IPV6_MAX_ADDRESSES,
      .accept_ra_defrtr = 1,
      .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,
};

/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;

/* Check if a valid qdisc is available */
static inline bool addrconf_qdisc_ok(const struct net_device *dev)
{
      return !qdisc_tx_is_noop(dev);
}

/* Check if a route is valid prefix route */
static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
{
      return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
}

static void addrconf_del_timer(struct inet6_ifaddr *ifp)
{
      if (del_timer(&ifp->timer))
            __in6_ifa_put(ifp);
}

enum addrconf_timer_t
{
      AC_NONE,
      AC_DAD,
      AC_RS,
};

static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
                         enum addrconf_timer_t what,
                         unsigned long when)
{
      if (!del_timer(&ifp->timer))
            in6_ifa_hold(ifp);

      switch (what) {
      case AC_DAD:
            ifp->timer.function = addrconf_dad_timer;
            break;
      case AC_RS:
            ifp->timer.function = addrconf_rs_timer;
            break;
      default:;
      }
      ifp->timer.expires = jiffies + when;
      add_timer(&ifp->timer);
}

static int snmp6_alloc_dev(struct inet6_dev *idev)
{
      if (snmp_mib_init((void **)idev->stats.ipv6,
                    sizeof(struct ipstats_mib)) < 0)
            goto err_ip;
      if (snmp_mib_init((void **)idev->stats.icmpv6,
                    sizeof(struct icmpv6_mib)) < 0)
            goto err_icmp;
      if (snmp_mib_init((void **)idev->stats.icmpv6msg,
                    sizeof(struct icmpv6msg_mib)) < 0)
            goto err_icmpmsg;

      return 0;

err_icmpmsg:
      snmp_mib_free((void **)idev->stats.icmpv6);
err_icmp:
      snmp_mib_free((void **)idev->stats.ipv6);
err_ip:
      return -ENOMEM;
}

static void snmp6_free_dev(struct inet6_dev *idev)
{
      snmp_mib_free((void **)idev->stats.icmpv6msg);
      snmp_mib_free((void **)idev->stats.icmpv6);
      snmp_mib_free((void **)idev->stats.ipv6);
}

/* Nobody refers to this device, we may destroy it. */

static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
{
      struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
      kfree(idev);
}

void in6_dev_finish_destroy(struct inet6_dev *idev)
{
      struct net_device *dev = idev->dev;

      WARN_ON(idev->addr_list != NULL);
      WARN_ON(idev->mc_list != NULL);

#ifdef NET_REFCNT_DEBUG
      printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
#endif
      dev_put(dev);
      if (!idev->dead) {
            printk("Freeing alive inet6 device %p\n", idev);
            return;
      }
      snmp6_free_dev(idev);
      call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
}

EXPORT_SYMBOL(in6_dev_finish_destroy);

static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
{
      struct inet6_dev *ndev;

      ASSERT_RTNL();

      if (dev->mtu < IPV6_MIN_MTU)
            return NULL;

      ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);

      if (ndev == NULL)
            return NULL;

      rwlock_init(&ndev->lock);
      ndev->dev = dev;
      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 == NULL) {
            kfree(ndev);
            return NULL;
      }
      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);
            ndev->dead = 1;
            in6_dev_finish_destroy(ndev);
            return NULL;
      }

      if (snmp6_register_dev(ndev) < 0) {
            ADBG((KERN_WARNING
                  "%s(): cannot create /proc/net/dev_snmp6/%s\n",
                  __func__, dev->name));
            neigh_parms_release(&nd_tbl, ndev->nd_parms);
            ndev->dead = 1;
            in6_dev_finish_destroy(ndev);
            return NULL;
      }

      /* 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 defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
      if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
            printk(KERN_INFO
                   "%s: Disabled Multicast RS\n",
                   dev->name);
            ndev->cnf.rtr_solicits = 0;
      }
#endif

#ifdef CONFIG_IPV6_PRIVACY
      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) {
            printk(KERN_INFO
                   "%s: Disabled Privacy Extensions\n",
                   dev->name);
            ndev->cnf.use_tempaddr = -1;
      } else {
            in6_dev_hold(ndev);
            ipv6_regen_rndid((unsigned long) ndev);
      }
#endif

      if (netif_running(dev) && addrconf_qdisc_ok(dev))
            ndev->if_flags |= IF_READY;

      ipv6_mc_init_dev(ndev);
      ndev->tstamp = jiffies;
      addrconf_sysctl_register(ndev);
      /* protected by rtnl_lock */
      rcu_assign_pointer(dev->ip6_ptr, ndev);

      /* Join all-node multicast group */
      ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);

      return ndev;
}

static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
{
      struct inet6_dev *idev;

      ASSERT_RTNL();

      if ((idev = __in6_dev_get(dev)) == NULL) {
            if ((idev = ipv6_add_dev(dev)) == NULL)
                  return NULL;
      }

      if (dev->flags&IFF_UP)
            ipv6_mc_up(idev);
      return idev;
}

#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 && (dev->flags & IFF_MULTICAST)) {
            if (idev->cnf.forwarding)
                  ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
            else
                  ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
      }
      for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
            if (ifa->flags&IFA_F_TENTATIVE)
                  continue;
            if (idev->cnf.forwarding)
                  addrconf_join_anycast(ifa);
            else
                  addrconf_leave_anycast(ifa);
      }
}


static void addrconf_forward_change(struct net *net, __s32 newf)
{
      struct net_device *dev;
      struct inet6_dev *idev;

      read_lock(&dev_base_lock);
      for_each_netdev(net, dev) {
            rcu_read_lock();
            idev = __in6_dev_get(dev);
            if (idev) {
                  int changed = (!idev->cnf.forwarding) ^ (!newf);
                  idev->cnf.forwarding = newf;
                  if (changed)
                        dev_forward_change(idev);
            }
            rcu_read_unlock();
      }
      read_unlock(&dev_base_lock);
}

static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
{
      struct net *net;

      net = (struct net *)table->extra2;
      if (p == &net->ipv6.devconf_dflt->forwarding)
            return 0;

      if (!rtnl_trylock())
            return restart_syscall();

      if (p == &net->ipv6.devconf_all->forwarding) {
            __s32 newf = net->ipv6.devconf_all->forwarding;
            net->ipv6.devconf_dflt->forwarding = newf;
            addrconf_forward_change(net, newf);
      } else if ((!*p) ^ (!old))
            dev_forward_change((struct inet6_dev *)table->extra1);
      rtnl_unlock();

      if (*p)
            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(ifp->if_next != NULL);
      WARN_ON(ifp->lst_next != NULL);

#ifdef NET_REFCNT_DEBUG
      printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
#endif

      in6_dev_put(ifp->idev);

      if (del_timer(&ifp->timer))
            printk("Timer is still running, when freeing ifa=%p\n", ifp);

      if (!ifp->dead) {
            printk("Freeing alive inet6 address %p\n", ifp);
            return;
      }
      dst_release(&ifp->rt->u.dst);

      kfree(ifp);
}

static void
ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
{
      struct inet6_ifaddr *ifa, **ifap;
      int ifp_scope = ipv6_addr_src_scope(&ifp->addr);

      /*
       * Each device address list is sorted in order of scope -
       * global before linklocal.
       */
      for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
           ifap = &ifa->if_next) {
            if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
                  break;
      }

      ifp->if_next = *ifap;
      *ifap = ifp;
}

/*
 *    Hash function taken from net_alias.c
 */
static u8 ipv6_addr_hash(const struct in6_addr *addr)
{
      __u32 word;

      /*
       * We perform the hash function over the last 64 bits of the address
       * This will include the IEEE address token on links that support it.
       */

      word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
      word ^= (word >> 16);
      word ^= (word >> 8);

      return ((word ^ (word >> 4)) & 0x0f);
}

/* 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, int pfxlen,
            int scope, u32 flags)
{
      struct inet6_ifaddr *ifa = NULL;
      struct rt6_info *rt;
      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;
      }

      write_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 == NULL) {
            ADBG(("ipv6_add_addr: malloc failed\n"));
            err = -ENOBUFS;
            goto out;
      }

      rt = addrconf_dst_alloc(idev, addr, 0);
      if (IS_ERR(rt)) {
            err = PTR_ERR(rt);
            goto out;
      }

      ipv6_addr_copy(&ifa->addr, addr);

      spin_lock_init(&ifa->lock);
      init_timer(&ifa->timer);
      ifa->timer.data = (unsigned long) ifa;
      ifa->scope = scope;
      ifa->prefix_len = pfxlen;
      ifa->flags = flags | IFA_F_TENTATIVE;
      ifa->cstamp = ifa->tstamp = jiffies;

      ifa->rt = rt;

      /*
       * part one of RFC 4429, section 3.3
       * We should not configure an address as
       * optimistic if we do not yet know the link
       * layer address of our nexhop router
       */

      if (rt->rt6i_nexthop == NULL)
            ifa->flags &= ~IFA_F_OPTIMISTIC;

      ifa->idev = idev;
      in6_dev_hold(idev);
      /* For caller */
      in6_ifa_hold(ifa);

      /* Add to big hash table */
      hash = ipv6_addr_hash(addr);

      ifa->lst_next = inet6_addr_lst[hash];
      inet6_addr_lst[hash] = ifa;
      in6_ifa_hold(ifa);
      write_unlock(&addrconf_hash_lock);

      write_lock(&idev->lock);
      /* Add to inet6_dev unicast addr list. */
      ipv6_link_dev_addr(idev, ifa);

#ifdef CONFIG_IPV6_PRIVACY
      if (ifa->flags&IFA_F_TEMPORARY) {
            ifa->tmp_next = idev->tempaddr_list;
            idev->tempaddr_list = ifa;
            in6_ifa_hold(ifa);
      }
#endif

      in6_ifa_hold(ifa);
      write_unlock(&idev->lock);
out2:
      rcu_read_unlock_bh();

      if (likely(err == 0))
            atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
      else {
            kfree(ifa);
            ifa = ERR_PTR(err);
      }

      return ifa;
out:
      write_unlock(&addrconf_hash_lock);
      goto out2;
}

/* This function wants to get referenced ifp and releases it before return */

static void ipv6_del_addr(struct inet6_ifaddr *ifp)
{
      struct inet6_ifaddr *ifa, **ifap;
      struct inet6_dev *idev = ifp->idev;
      int hash;
      int deleted = 0, onlink = 0;
      unsigned long expires = jiffies;

      hash = ipv6_addr_hash(&ifp->addr);

      ifp->dead = 1;

      write_lock_bh(&addrconf_hash_lock);
      for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
           ifap = &ifa->lst_next) {
            if (ifa == ifp) {
                  *ifap = ifa->lst_next;
                  __in6_ifa_put(ifp);
                  ifa->lst_next = NULL;
                  break;
            }
      }
      write_unlock_bh(&addrconf_hash_lock);

      write_lock_bh(&idev->lock);
#ifdef CONFIG_IPV6_PRIVACY
      if (ifp->flags&IFA_F_TEMPORARY) {
            for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
                 ifap = &ifa->tmp_next) {
                  if (ifa == ifp) {
                        *ifap = ifa->tmp_next;
                        if (ifp->ifpub) {
                              in6_ifa_put(ifp->ifpub);
                              ifp->ifpub = NULL;
                        }
                        __in6_ifa_put(ifp);
                        ifa->tmp_next = NULL;
                        break;
                  }
            }
      }
#endif

      for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
            if (ifa == ifp) {
                  *ifap = ifa->if_next;
                  __in6_ifa_put(ifp);
                  ifa->if_next = NULL;
                  if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
                        break;
                  deleted = 1;
                  continue;
            } else if (ifp->flags & IFA_F_PERMANENT) {
                  if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
                                    ifp->prefix_len)) {
                        if (ifa->flags & IFA_F_PERMANENT) {
                              onlink = 1;
                              if (deleted)
                                    break;
                        } else {
                              unsigned long lifetime;

                              if (!onlink)
                                    onlink = -1;

                              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);
                        }
                  }
            }
            ifap = &ifa->if_next;
      }
      write_unlock_bh(&idev->lock);

      addrconf_del_timer(ifp);

      ipv6_ifa_notify(RTM_DELADDR, ifp);

      atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);

      /*
       * Purge or update corresponding prefix
       *
       * 1) we don't purge prefix here if address was not permanent.
       *    prefix is managed by its own lifetime.
       * 2) if there're no addresses, delete prefix.
       * 3) if there're still other permanent address(es),
       *    corresponding prefix is still permanent.
       * 4) otherwise, update prefix lifetime to the
       *    longest valid lifetime among the corresponding
       *    addresses on the device.
       *    Note: subsequent RA will update lifetime.
       *
       * --yoshfuji
       */
      if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
            struct in6_addr prefix;
            struct rt6_info *rt;
            struct net *net = dev_net(ifp->idev->dev);
            ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
            rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);

            if (rt && addrconf_is_prefix_route(rt)) {
                  if (onlink == 0) {
                        ip6_del_rt(rt);
                        rt = NULL;
                  } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
                        rt->rt6i_expires = expires;
                        rt->rt6i_flags |= RTF_EXPIRES;
                  }
            }
            dst_release(&rt->u.dst);
      }

      in6_ifa_put(ifp);
}

#ifdef CONFIG_IPV6_PRIVACY
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_cstamp, tmp_tstamp;
      unsigned long regen_advance;
      int tmp_plen;
      int ret = 0;
      int max_addresses;
      u32 addr_flags;

      write_lock(&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(&idev->lock);
            printk(KERN_INFO
                  "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
            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(&idev->lock);
            printk(KERN_WARNING
                  "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
            in6_dev_put(idev);
            ret = -1;
            goto out;
      }
      in6_ifa_hold(ifp);
      memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
      if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
            spin_unlock_bh(&ifp->lock);
            write_unlock(&idev->lock);
            printk(KERN_WARNING
                  "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
            in6_ifa_put(ifp);
            in6_dev_put(idev);
            ret = -1;
            goto out;
      }
      memcpy(&addr.s6_addr[8], idev->rndid, 8);
      tmp_valid_lft = min_t(__u32,
                        ifp->valid_lft,
                        idev->cnf.temp_valid_lft);
      tmp_prefered_lft = min_t(__u32,
                         ifp->prefered_lft,
                         idev->cnf.temp_prefered_lft - desync_factor / HZ);
      tmp_plen = ifp->prefix_len;
      max_addresses = idev->cnf.max_addresses;
      tmp_cstamp = ifp->cstamp;
      tmp_tstamp = ifp->tstamp;
      spin_unlock_bh(&ifp->lock);

      regen_advance = idev->cnf.regen_max_retry *
                      idev->cnf.dad_transmits *
                      idev->nd_parms->retrans_time / HZ;
      write_unlock(&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.
       */
      if (tmp_prefered_lft <= regen_advance) {
            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 = !max_addresses ||
            ipv6_count_addresses(idev) < max_addresses ?
            ipv6_add_addr(idev, &addr, tmp_plen,
                        ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
                        addr_flags) : NULL;
      if (!ift || IS_ERR(ift)) {
            in6_ifa_put(ifp);
            in6_dev_put(idev);
            printk(KERN_INFO
                  "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
            tmpaddr = &addr;
            write_lock(&idev->lock);
            goto retry;
      }

      spin_lock_bh(&ift->lock);
      ift->ifpub = ifp;
      ift->valid_lft = tmp_valid_lft;
      ift->prefered_lft = tmp_prefered_lft;
      ift->cstamp = tmp_cstamp;
      ift->tstamp = tmp_tstamp;
      spin_unlock_bh(&ift->lock);

      addrconf_dad_start(ift, 0);
      in6_ifa_put(ift);
      in6_dev_put(idev);
out:
      return ret;
}
#endif

/*
 *    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,
#ifdef CONFIG_IPV6_PRIVACY
      IPV6_SADDR_RULE_PRIVACY,
#endif
      IPV6_SADDR_RULE_ORCHID,
      IPV6_SADDR_RULE_PREFIX,
      IPV6_SADDR_RULE_MAX
};

00973 struct ipv6_saddr_score {
      int               rule;
      int               addr_type;
      struct inet6_ifaddr     *ifa;
      DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
      int               scopedist;
      int               matchlen;
};

00982 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|IPV6_ADDR_RESERVED))
            return 1;
      return 0;
}

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 destinaion.
             *       |             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 */
            ret = ipv6_saddr_preferred(score->addr_type) ||
                  !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
            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;
#ifdef CONFIG_IPV6_PRIVACY
      case IPV6_SADDR_RULE_PRIVACY:
          {
            /* Rule 7: Prefer public address
             * Note: prefer temprary 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;
          }
#endif
      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 */
            score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
                                           dst->addr);
            break;
      default:
            ret = 0;
      }

      if (ret)
            __set_bit(i, score->scorebits);
      score->rule = i;
out:
      return ret;
}

int ipv6_dev_get_saddr(struct net *net, 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;

      read_lock(&dev_base_lock);
      rcu_read_lock();

      for_each_netdev(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);
            for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
                  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)) {
                        LIMIT_NETDEBUG(KERN_DEBUG
                                     "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();
      read_unlock(&dev_base_lock);

      if (!hiscore->ifa)
            return -EADDRNOTAVAIL;

      ipv6_addr_copy(saddr, &hiscore->ifa->addr);
      in6_ifa_put(hiscore->ifa);
      return 0;
}

EXPORT_SYMBOL(ipv6_dev_get_saddr);

int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
                unsigned char banned_flags)
{
      struct inet6_dev *idev;
      int err = -EADDRNOTAVAIL;

      rcu_read_lock();
      if ((idev = __in6_dev_get(dev)) != NULL) {
            struct inet6_ifaddr *ifp;

            read_lock_bh(&idev->lock);
            for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
                  if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
                        ipv6_addr_copy(addr, &ifp->addr);
                        err = 0;
                        break;
                  }
            }
            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);
      for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
            cnt++;
      read_unlock_bh(&idev->lock);
      return cnt;
}

int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
              struct net_device *dev, int strict)
{
      struct inet6_ifaddr * ifp;
      u8 hash = ipv6_addr_hash(addr);

      read_lock_bh(&addrconf_hash_lock);
      for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
            if (!net_eq(dev_net(ifp->idev->dev), net))
                  continue;
            if (ipv6_addr_equal(&ifp->addr, addr) &&
                !(ifp->flags&IFA_F_TENTATIVE)) {
                  if (dev == NULL || ifp->idev->dev == dev ||
                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
                        break;
            }
      }
      read_unlock_bh(&addrconf_hash_lock);
      return ifp != NULL;
}
EXPORT_SYMBOL(ipv6_chk_addr);

static
int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
                   struct net_device *dev)
{
      struct inet6_ifaddr * ifp;
      u8 hash = ipv6_addr_hash(addr);

      for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
            if (!net_eq(dev_net(ifp->idev->dev), net))
                  continue;
            if (ipv6_addr_equal(&ifp->addr, addr)) {
                  if (dev == NULL || ifp->idev->dev == dev)
                        break;
            }
      }
      return ifp != NULL;
}

int ipv6_chk_prefix(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);
            for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
                  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;
      u8 hash = ipv6_addr_hash(addr);

      read_lock_bh(&addrconf_hash_lock);
      for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
            if (!net_eq(dev_net(ifp->idev->dev), net))
                  continue;
            if (ipv6_addr_equal(&ifp->addr, addr)) {
                  if (dev == NULL || ifp->idev->dev == dev ||
                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
                        in6_ifa_hold(ifp);
                        break;
                  }
            }
      }
      read_unlock_bh(&addrconf_hash_lock);

      return ifp;
}

/* Gets referenced address, destroys ifaddr */

static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
{
      if (ifp->flags&IFA_F_PERMANENT) {
            spin_lock_bh(&ifp->lock);
            addrconf_del_timer(ifp);
            ifp->flags |= IFA_F_TENTATIVE;
            spin_unlock_bh(&ifp->lock);
            in6_ifa_put(ifp);
#ifdef CONFIG_IPV6_PRIVACY
      } 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);
#endif
      } else
            ipv6_del_addr(ifp);
}

void addrconf_dad_failure(struct inet6_ifaddr *ifp)
{
      struct inet6_dev *idev = ifp->idev;

      if (net_ratelimit())
            printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
                  ifp->idev->dev->name);

      if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
            struct in6_addr addr;

            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;

                  printk(KERN_INFO "%s: IPv6 being disabled!\n",
                        ifp->idev->dev->name);
            }
      }

      addrconf_dad_stop(ifp);
}

/* Join to solicited addr multicast group. */

void addrconf_join_solict(struct net_device *dev, 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);
}

void addrconf_leave_solict(struct inet6_dev *idev, 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);
}

static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
{
      struct in6_addr addr;
      ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
      if (ipv6_addr_any(&addr))
            return;
      ipv6_dev_ac_inc(ifp->idev->dev, &addr);
}

static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
{
      struct in6_addr addr;
      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_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;
}

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;
}
EXPORT_SYMBOL(__ipv6_isatap_ifid);

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 ipv6_generate_eui64(u8 *eui, struct net_device *dev)
{
      switch (dev->type) {
      case ARPHRD_ETHER:
      case ARPHRD_FDDI:
      case ARPHRD_IEEE802_TR:
            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);
      }
      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);
      for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
            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;
}

#ifdef CONFIG_IPV6_PRIVACY
/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
static int __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;
      }

      return 0;
}

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;

      if (__ipv6_regen_rndid(idev) < 0)
            goto out;

      expires = jiffies +
            idev->cnf.temp_prefered_lft * HZ -
            idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
      if (time_before(expires, jiffies)) {
            printk(KERN_WARNING
                  "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
                  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 int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
      int ret = 0;

      if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
            ret = __ipv6_regen_rndid(idev);
      return ret;
}
#endif

/*
 *    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,
      };

      ipv6_addr_copy(&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 defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
      if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
            cfg.fc_flags |= RTF_NONEXTHOP;
#endif

      ip6_route_add(&cfg);
}

/* 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);
}

#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
static void sit_route_add(struct net_device *dev)
{
      struct fib6_config cfg = {
            .fc_table = RT6_TABLE_MAIN,
            .fc_metric = IP6_RT_PRIO_ADDRCONF,
            .fc_ifindex = dev->ifindex,
            .fc_dst_len = 96,
            .fc_flags = RTF_UP | RTF_NONEXTHOP,
            .fc_nlinfo.nl_net = dev_net(dev),
      };

      /* prefix length - 96 bits "::d.d.d.d" */
      ip6_route_add(&cfg);
}
#endif

static void addrconf_add_lroute(struct net_device *dev)
{
      struct in6_addr addr;

      ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
      addrconf_prefix_route(&addr, 64, dev, 0, 0);
}

static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
{
      struct inet6_dev *idev;

      ASSERT_RTNL();

      if ((idev = ipv6_find_idev(dev)) == NULL)
            return NULL;

      /* Add default multicast route */
      addrconf_add_mroute(dev);

      /* Add link local route */
      addrconf_add_lroute(dev);
      return idev;
}

void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
{
      struct prefix_info *pinfo;
      __u32 valid_lft;
      __u32 prefered_lft;
      int addr_type;
      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) {
            if (net_ratelimit())
                  printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
            return;
      }

      in6_dev = in6_dev_get(dev);

      if (in6_dev == NULL) {
            if (net_ratelimit())
                  printk(KERN_DEBUG "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 = rt6_lookup(net, &pinfo->prefix, NULL,
                        dev->ifindex, 1);

            if (rt && addrconf_is_prefix_route(rt)) {
                  /* Autoconf prefix route */
                  if (valid_lft == 0) {
                        ip6_del_rt(rt);
                        rt = NULL;
                  } else if (addrconf_finite_timeout(rt_expires)) {
                        /* not infinity */
                        rt->rt6i_expires = jiffies + rt_expires;
                        rt->rt6i_flags |= RTF_EXPIRES;
                  } else {
                        rt->rt6i_flags &= ~RTF_EXPIRES;
                        rt->rt6i_expires = 0;
                  }
            } 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);
            }
            if (rt)
                  dst_release(&rt->u.dst);
      }

      /* 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;

            if (pinfo->prefix_len == 64) {
                  memcpy(&addr, &pinfo->prefix, 8);
                  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;
            }
            if (net_ratelimit())
                  printk(KERN_DEBUG "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 == NULL && valid_lft) {
                  int max_addresses = in6_dev->cnf.max_addresses;
                  u32 addr_flags = 0;

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
                  if (in6_dev->cnf.optimistic_dad &&
                      !net->ipv6.devconf_all->forwarding)
                        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, pinfo->prefix_len,
                                        addr_type&IPV6_ADDR_SCOPE_MASK,
                                        addr_flags);

                  if (!ifp || IS_ERR(ifp)) {
                        in6_dev_put(in6_dev);
                        return;
                  }

                  update_lft = create = 1;
                  ifp->cstamp = jiffies;
                  addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
            }

            if (ifp) {
                  int flags;
                  unsigned long now;
#ifdef CONFIG_IPV6_PRIVACY
                  struct inet6_ifaddr *ift;
#endif
                  u32 stored_lft;

                  /* update lifetime (RFC2462 5.5.3 e) */
                  spin_lock(&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 && stored_lft) {
                        if (valid_lft > MIN_VALID_LIFETIME ||
                            valid_lft > stored_lft)
                              update_lft = 1;
                        else if (stored_lft <= MIN_VALID_LIFETIME) {
                              /* valid_lft <= stored_lft is always true */
                              /*
                               * RFC 4862 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 if the preferred lifetime in
                               *  this advertisement is different
                               *  than what we have stored, but the
                               *  valid lifetime is invalid, just
                               *  reset prefered_lft.
                               *
                               *  We must set the valid lifetime
                               *  to the stored lifetime since we'll
                               *  be updating the timestamp below,
                               *  else we'll set it back to the
                               *  minumum.
                               */
                              if (prefered_lft != ifp->prefered_lft) {
                                    valid_lft = stored_lft;
                                    update_lft = 1;
                              }
                        } else {
                              valid_lft = MIN_VALID_LIFETIME;
                              if (valid_lft < prefered_lft)
                                    prefered_lft = valid_lft;
                              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(&ifp->lock);

                        if (!(flags&IFA_F_TENTATIVE))
                              ipv6_ifa_notify(0, ifp);
                  } else
                        spin_unlock(&ifp->lock);

#ifdef CONFIG_IPV6_PRIVACY
                  read_lock_bh(&in6_dev->lock);
                  /* update all temporary addresses in the list */
                  for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
                        /*
                         * When adjusting the lifetimes of an existing
                         * temporary address, only lower the lifetimes.
                         * Implementations must not increase the
                         * lifetimes of an existing temporary address
                         * when processing a Prefix Information Option.
                         */
                        if (ifp != ift->ifpub)
                              continue;

                        spin_lock(&ift->lock);
                        flags = ift->flags;
                        if (ift->valid_lft > valid_lft &&
                            ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
                              ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
                        if (ift->prefered_lft > prefered_lft &&
                            ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
                              ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
                        spin_unlock(&ift->lock);
                        if (!(flags&IFA_F_TENTATIVE))
                              ipv6_ifa_notify(0, ift);
                  }

                  if (create && in6_dev->cnf.use_tempaddr > 0) {
                        /*
                         * When a new public address is created as described in [ADDRCONF],
                         * also create a new temporary address.
                         */
                        read_unlock_bh(&in6_dev->lock);
                        ipv6_create_tempaddr(ifp, NULL);
                  } else {
                        read_unlock_bh(&in6_dev->lock);
                  }
#endif
                  in6_ifa_put(ifp);
                  addrconf_verify(0);
            }
      }
      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 == NULL)
            goto err_exit;

#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
      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;
}

/*
 *    Manual configuration of address on an interface
 */
static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
                    unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
                    __u32 valid_lft)
{
      struct inet6_ifaddr *ifp;
      struct inet6_dev *idev;
      struct net_device *dev;
      int scope;
      u32 flags;
      clock_t expires;
      unsigned long timeout;

      ASSERT_RTNL();

      if (plen > 128)
            return -EINVAL;

      /* check the lifetime */
      if (!valid_lft || prefered_lft > valid_lft)
            return -EINVAL;

      dev = __dev_get_by_index(net, ifindex);
      if (!dev)
            return -ENODEV;

      if ((idev = addrconf_add_dev(dev)) == NULL)
            return -ENOBUFS;

      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, plen, scope, ifa_flags);

      if (!IS_ERR(ifp)) {
            spin_lock_bh(&ifp->lock);
            ifp->valid_lft = valid_lft;
            ifp->prefered_lft = prefered_lft;
            ifp->tstamp = jiffies;
            spin_unlock_bh(&ifp->lock);

            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, 0);
            in6_ifa_put(ifp);
            addrconf_verify(0);
            return 0;
      }

      return PTR_ERR(ifp);
}

static int inet6_addr_del(struct net *net, int ifindex, 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;

      if ((idev = __in6_dev_get(dev)) == NULL)
            return -ENXIO;

      read_lock_bh(&idev->lock);
      for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
            if (ifp->prefix_len == plen &&
                ipv6_addr_equal(pfx, &ifp->addr)) {
                  in6_ifa_hold(ifp);
                  read_unlock_bh(&idev->lock);

                  ipv6_del_addr(ifp);

                  /* If the last address is deleted administratively,
                     disable IPv6 on this interface.
                   */
                  if (idev->addr_list == NULL)
                        addrconf_ifdown(idev->dev, 1);
                  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 (!capable(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,
                       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 (!capable(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, &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, plen, scope, IFA_F_PERMANENT);
      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 defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
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;

      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;
      } else {
            scope = IPV6_ADDR_COMPATv4;
      }

      if (addr.s6_addr32[3]) {
            add_addr(idev, &addr, 128, scope);
            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) {
                        int plen;

                        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;
                        }
                        if (idev->dev->flags&IFF_POINTOPOINT)
                              plen = 64;
                        else
                              plen = 96;

                        add_addr(idev, &addr, plen, flag);
                  }
            }
      }
}
#endif

static void init_loopback(struct net_device *dev)
{
      struct inet6_dev  *idev;

      /* ::1 */

      ASSERT_RTNL();

      if ((idev = ipv6_find_idev(dev)) == NULL) {
            printk(KERN_DEBUG "init loopback: add_dev failed\n");
            return;
      }

      add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
}

static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
{
      struct inet6_ifaddr * ifp;
      u32 addr_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, 64, IFA_LINK, addr_flags);
      if (!IS_ERR(ifp)) {
            addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
            addrconf_dad_start(ifp, 0);
            in6_ifa_put(ifp);
      }
}

static void addrconf_dev_config(struct net_device *dev)
{
      struct in6_addr addr;
      struct inet6_dev    * idev;

      ASSERT_RTNL();

      if ((dev->type != ARPHRD_ETHER) &&
          (dev->type != ARPHRD_FDDI) &&
          (dev->type != ARPHRD_IEEE802_TR) &&
          (dev->type != ARPHRD_ARCNET) &&
          (dev->type != ARPHRD_INFINIBAND)) {
            /* Alas, we support only Ethernet autoconfiguration. */
            return;
      }

      idev = addrconf_add_dev(dev);
      if (idev == NULL)
            return;

      memset(&addr, 0, sizeof(struct in6_addr));
      addr.s6_addr32[0] = htonl(0xFE800000);

      if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
            addrconf_add_linklocal(idev, &addr);
}

#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
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
       */

      if ((idev = ipv6_find_idev(dev)) == NULL) {
            printk(KERN_DEBUG "init sit: add_dev failed\n");
            return;
      }

      if (dev->priv_flags & IFF_ISATAP) {
            struct in6_addr addr;

            ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
            addrconf_prefix_route(&addr, 64, dev, 0, 0);
            if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
                  addrconf_add_linklocal(idev, &addr);
            return;
      }

      sit_add_v4_addrs(idev);

      if (dev->flags&IFF_POINTOPOINT) {
            addrconf_add_mroute(dev);
            addrconf_add_lroute(dev);
      } else
            sit_route_add(dev);
}
#endif

static inline int
ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
{
      struct in6_addr lladdr;

      if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
            addrconf_add_linklocal(idev, &lladdr);
            return 0;
      }
      return -1;
}

static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
{
      struct net_device *link_dev;
      struct net *net = dev_net(idev->dev);

      /* first try to inherit the link-local address from the link device */
      if (idev->dev->iflink &&
          (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
            if (!ipv6_inherit_linklocal(idev, link_dev))
                  return;
      }
      /* then try to inherit it from any device */
      for_each_netdev(net, link_dev) {
            if (!ipv6_inherit_linklocal(idev, link_dev))
                  return;
      }
      printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
}

/*
 * Autoconfigure tunnel with a link-local address so routing protocols,
 * DHCPv6, MLD etc. can be run over the virtual link
 */

static void addrconf_ip6_tnl_config(struct net_device *dev)
{
      struct inet6_dev *idev;

      ASSERT_RTNL();

      if ((idev = addrconf_add_dev(dev)) == NULL) {
            printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
            return;
      }
      ip6_tnl_add_linklocal(idev);
}

static int addrconf_notify(struct notifier_block *this, unsigned long event,
                     void * data)
{
      struct net_device *dev = (struct net_device *) data;
      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 (!idev)
                        return notifier_from_errno(-ENOMEM);
            }
            break;
      case NETDEV_UP:
      case NETDEV_CHANGE:
            if (dev->flags & IFF_SLAVE)
                  break;

            if (event == NETDEV_UP) {
                  if (!addrconf_qdisc_ok(dev)) {
                        /* device is not ready yet. */
                        printk(KERN_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 (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;
                  }

                  printk(KERN_INFO
                              "ADDRCONF(NETDEV_CHANGE): %s: "
                              "link becomes ready\n",
                              dev->name);

                  run_pending = 1;
            }

            switch(dev->type) {
#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
            case ARPHRD_SIT:
                  addrconf_sit_config(dev);
                  break;
#endif
            case ARPHRD_TUNNEL6:
                  addrconf_ip6_tnl_config(dev);
                  break;
            case ARPHRD_LOOPBACK:
                  init_loopback(dev);
                  break;

            default:
                  addrconf_dev_config(dev);
                  break;
            }
            if (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, event != NETDEV_DOWN);
            }
            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 (idev)
                        break;
            }

            /* MTU falled 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);
                  addrconf_sysctl_register(idev);
                  err = snmp6_register_dev(idev);
                  if (err)
                        return notifier_from_errno(err);
            }
            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,
      .priority = 0
};

static int addrconf_ifdown(struct net_device *dev, int how)
{
      struct inet6_dev *idev;
      struct inet6_ifaddr *ifa, **bifa;
      struct net *net = dev_net(dev);
      int i;

      ASSERT_RTNL();

      rt6_ifdown(net, dev);
      neigh_ifdown(&nd_tbl, dev);

      idev = __in6_dev_get(dev);
      if (idev == NULL)
            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_assign_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++) {
            bifa = &inet6_addr_lst[i];

            write_lock_bh(&addrconf_hash_lock);
            while ((ifa = *bifa) != NULL) {
                  if (ifa->idev == idev) {
                        *bifa = ifa->lst_next;
                        ifa->lst_next = NULL;
                        addrconf_del_timer(ifa);
                        in6_ifa_put(ifa);
                        continue;
                  }
                  bifa = &ifa->lst_next;
            }
            write_unlock_bh(&addrconf_hash_lock);
      }

      write_lock_bh(&idev->lock);

      /* Step 3: clear flags for stateless addrconf */
      if (!how)
            idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);

      /* Step 4: clear address list */
#ifdef CONFIG_IPV6_PRIVACY
      if (how && del_timer(&idev->regen_timer))
            in6_dev_put(idev);

      /* clear tempaddr list */
      while ((ifa = idev->tempaddr_list) != NULL) {
            idev->tempaddr_list = ifa->tmp_next;
            ifa->tmp_next = NULL;
            ifa->dead = 1;
            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);
      }
#endif
      while ((ifa = idev->addr_list) != NULL) {
            idev->addr_list = ifa->if_next;
            ifa->if_next = NULL;
            ifa->dead = 1;
            addrconf_del_timer(ifa);
            write_unlock_bh(&idev->lock);

            __ipv6_ifa_notify(RTM_DELADDR, ifa);
            atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
            in6_ifa_put(ifa);

            write_lock_bh(&idev->lock);
      }
      write_unlock_bh(&idev->lock);

      /* Step 5: Discard multicast list */

      if (how)
            ipv6_mc_destroy_dev(idev);
      else
            ipv6_mc_down(idev);

      idev->tstamp = jiffies;

      /* 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_ifaddr *ifp = (struct inet6_ifaddr *) data;

      if (ifp->idev->cnf.forwarding)
            goto out;

      if (ifp->idev->if_flags & IF_RA_RCVD) {
            /*
             *    Announcement received after solicitation
             *    was sent
             */
            goto out;
      }

      spin_lock(&ifp->lock);
      if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
            /* The wait after the last probe can be shorter */
            addrconf_mod_timer(ifp, AC_RS,
                           (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
                           ifp->idev->cnf.rtr_solicit_delay :
                           ifp->idev->cnf.rtr_solicit_interval);
            spin_unlock(&ifp->lock);

            ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
      } else {
            spin_unlock(&ifp->lock);
            /*
             * Note: we do not support deprecated "all on-link"
             * assumption any longer.
             */
            printk(KERN_DEBUG "%s: no IPv6 routers present\n",
                   ifp->idev->dev->name);
      }

out:
      in6_ifa_put(ifp);
}

/*
 *    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 = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);

      ifp->probes = idev->cnf.dad_transmits;
      addrconf_mod_timer(ifp, AC_DAD, rand_num);
}

static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
{
      struct inet6_dev *idev = ifp->idev;
      struct net_device *dev = idev->dev;

      addrconf_join_solict(dev, &ifp->addr);

      net_srandom(ifp->addr.s6_addr32[3]);

      read_lock_bh(&idev->lock);
      if (ifp->dead)
            goto out;
      spin_lock_bh(&ifp->lock);

      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);
            spin_unlock_bh(&ifp->lock);
            read_unlock_bh(&idev->lock);

            addrconf_dad_completed(ifp);
            return;
      }

      if (!(idev->if_flags & IF_READY)) {
            spin_unlock_bh(&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);
            return;
      }

      /*
       * Optimistic nodes can start receiving
       * Frames right away
       */
      if(ifp->flags & IFA_F_OPTIMISTIC)
            ip6_ins_rt(ifp->rt);

      addrconf_dad_kick(ifp);
      spin_unlock_bh(&ifp->lock);
out:
      read_unlock_bh(&idev->lock);
}

static void addrconf_dad_timer(unsigned long data)
{
      struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
      struct inet6_dev *idev = ifp->idev;
      struct in6_addr mcaddr;

      read_lock_bh(&idev->lock);
      if (idev->dead) {
            read_unlock_bh(&idev->lock);
            goto out;
      }
      spin_lock_bh(&ifp->lock);
      if (ifp->probes == 0) {
            /*
             * DAD was successful
             */

            ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
            spin_unlock_bh(&ifp->lock);
            read_unlock_bh(&idev->lock);

            addrconf_dad_completed(ifp);

            goto out;
      }

      ifp->probes--;
      addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
      spin_unlock_bh(&ifp->lock);
      read_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);
}

static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
{
      struct net_device *     dev = ifp->idev->dev;

      /*
       *    Configure the address for reception. Now it is valid.
       */

      ipv6_ifa_notify(RTM_NEWADDR, ifp);

      /* If added prefix is link local and forwarding is off,
         start sending router solicitations.
       */

      if (ifp->idev->cnf.forwarding == 0 &&
          ifp->idev->cnf.rtr_solicits > 0 &&
          (dev->flags&IFF_LOOPBACK) == 0 &&
          (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
            /*
             *    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
             */
            ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);

            spin_lock_bh(&ifp->lock);
            ifp->probes = 1;
            ifp->idev->if_flags |= IF_RS_SENT;
            addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
            spin_unlock_bh(&ifp->lock);
      }
}

static void addrconf_dad_run(struct inet6_dev *idev) {
      struct inet6_ifaddr *ifp;

      read_lock_bh(&idev->lock);
      for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
            spin_lock_bh(&ifp->lock);
            if (!(ifp->flags & IFA_F_TENTATIVE)) {
                  spin_unlock_bh(&ifp->lock);
                  continue;
            }
            spin_unlock_bh(&ifp->lock);
            addrconf_dad_kick(ifp);
      }
      read_unlock_bh(&idev->lock);
}

#ifdef CONFIG_PROC_FS
struct if6_iter_state {
      struct seq_net_private p;
      int bucket;
};

static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
{
      struct inet6_ifaddr *ifa = NULL;
      struct if6_iter_state *state = seq->private;
      struct net *net = seq_file_net(seq);

      for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
            ifa = inet6_addr_lst[state->bucket];

            while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
                  ifa = ifa->lst_next;
            if (ifa)
                  break;
      }
      return ifa;
}

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);

      ifa = ifa->lst_next;
try_again:
      if (ifa) {
            if (!net_eq(dev_net(ifa->idev->dev), net)) {
                  ifa = ifa->lst_next;
                  goto try_again;
            }
      }

      if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
            ifa = inet6_addr_lst[state->bucket];
            goto try_again;
      }

      return ifa;
}

static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
{
      struct inet6_ifaddr *ifa = if6_get_first(seq);

      if (ifa)
            while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
                  --pos;
      return pos ? NULL : ifa;
}

static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
      __acquires(addrconf_hash_lock)
{
      read_lock_bh(&addrconf_hash_lock);
      return if6_get_idx(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(addrconf_hash_lock)
{
      read_unlock_bh(&addrconf_hash_lock);
}

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,
               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 if6_proc_net_init(struct net *net)
{
      if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
            return -ENOMEM;
      return 0;
}

static void if6_proc_net_exit(struct net *net)
{
       proc_net_remove(net, "if_inet6");
}

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 defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
/* Check if address is a home address configured on any interface. */
int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
{
      int ret = 0;
      struct inet6_ifaddr * ifp;
      u8 hash = ipv6_addr_hash(addr);
      read_lock_bh(&addrconf_hash_lock);
      for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
            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;
            }
      }
      read_unlock_bh(&addrconf_hash_lock);
      return ret;
}
#endif

/*
 *    Periodic address status verification
 */

static void addrconf_verify(unsigned long foo)
{
      struct inet6_ifaddr *ifp;
      unsigned long now, next;
      int i;

      spin_lock_bh(&addrconf_verify_lock);
      now = jiffies;
      next = now + ADDR_CHECK_FREQUENCY;

      del_timer(&addr_chk_timer);

      for (i=0; i < IN6_ADDR_HSIZE; i++) {

restart:
            read_lock(&addrconf_hash_lock);
            for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
                  unsigned long age;
#ifdef CONFIG_IPV6_PRIVACY
                  unsigned long regen_advance;
#endif

                  if (ifp->flags & IFA_F_PERMANENT)
                        continue;

                  spin_lock(&ifp->lock);
                  age = (now - ifp->tstamp) / HZ;

#ifdef CONFIG_IPV6_PRIVACY
                  regen_advance = ifp->idev->cnf.regen_max_retry *
                              ifp->idev->cnf.dad_transmits *
                              ifp->idev->nd_parms->retrans_time / HZ;
#endif

                  if (ifp->valid_lft != INFINITY_LIFE_TIME &&
                      age >= ifp->valid_lft) {
                        spin_unlock(&ifp->lock);
                        in6_ifa_hold(ifp);
                        read_unlock(&addrconf_hash_lock);
                        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 (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);
                              read_unlock(&addrconf_hash_lock);

                              ipv6_ifa_notify(0, ifp);
                              in6_ifa_put(ifp);
                              goto restart;
                        }
#ifdef CONFIG_IPV6_PRIVACY
                  } else if ((ifp->flags&IFA_F_TEMPORARY) &&
                           !(ifp->flags&IFA_F_TENTATIVE)) {
                        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);
                                    read_unlock(&addrconf_hash_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);
#endif
                  } 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);
                  }
            }
            read_unlock(&addrconf_hash_lock);
      }

      addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
      add_timer(&addr_chk_timer);
      spin_unlock_bh(&addrconf_verify_lock);
}

static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
{
      struct in6_addr *pfx = NULL;

      if (addr)
            pfx = nla_data(addr);

      if (local) {
            if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
                  pfx = NULL;
            else
                  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) },
};

static int
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
      struct net *net = sock_net(skb->sk);
      struct ifaddrmsg *ifm;
      struct nlattr *tb[IFA_MAX+1];
      struct in6_addr *pfx;
      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]);
      if (pfx == NULL)
            return -EINVAL;

      return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
}

static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
                       u32 prefered_lft, u32 valid_lft)
{
      u32 flags;
      clock_t expires;
      unsigned long timeout;

      if (!valid_lft || (prefered_lft > valid_lft))
            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);
      ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | 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);

      addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
                        expires, flags);
      addrconf_verify(0);

      return 0;
}

static int
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
      struct net *net = sock_net(skb->sk);
      struct ifaddrmsg *ifm;
      struct nlattr *tb[IFA_MAX+1];
      struct in6_addr *pfx;
      struct inet6_ifaddr *ifa;
      struct net_device *dev;
      u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
      u8 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]);
      if (pfx == NULL)
            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 == NULL)
            return -ENODEV;

      /* We ignore other flags so far. */
      ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);

      ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
      if (ifa == NULL) {
            /*
             * It would be best to check for !NLM_F_CREATE here but
             * userspace alreay relies on not having to provide this.
             */
            return inet6_addr_add(net, ifm->ifa_index, 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, u8 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 = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
                  + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
      ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
                  + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
      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_ADDRESS */
             + nla_total_size(sizeof(struct ifa_cacheinfo));
}

static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
                       u32 pid, u32 seq, int event, unsigned int flags)
{
      struct nlmsghdr  *nlh;
      u32 preferred, valid;

      nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
      if (nlh == NULL)
            return -EMSGSIZE;

      put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
                  ifa->idev->dev->ifindex);

      if (!(ifa->flags&IFA_F_PERMANENT)) {
            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)
                        valid -= tval;
            }
      } else {
            preferred = INFINITY_LIFE_TIME;
            valid = INFINITY_LIFE_TIME;
      }

      if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
          put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
            nlmsg_cancel(skb, nlh);
            return -EMSGSIZE;
      }

      return nlmsg_end(skb, nlh);
}

static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
                        u32 pid, 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, pid, seq, event, sizeof(struct ifaddrmsg), flags);
      if (nlh == NULL)
            return -EMSGSIZE;

      put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
      if (nla_put(skb, IFA_MULTICAST, 16, &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;
      }

      return nlmsg_end(skb, nlh);
}

static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
                        u32 pid, 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, pid, seq, event, sizeof(struct ifaddrmsg), flags);
      if (nlh == NULL)
            return -EMSGSIZE;

      put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
      if (nla_put(skb, IFA_ANYCAST, 16, &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;
      }

      return nlmsg_end(skb, nlh);
}

enum addr_type_t
{
      UNICAST_ADDR,
      MULTICAST_ADDR,
      ANYCAST_ADDR,
};

static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
                     enum addr_type_t type)
{
      int idx, ip_idx;
      int s_idx, s_ip_idx;
      int err = 1;
      struct net_device *dev;
      struct inet6_dev *idev = NULL;
      struct inet6_ifaddr *ifa;
      struct ifmcaddr6 *ifmca;
      struct ifacaddr6 *ifaca;
      struct net *net = sock_net(skb->sk);

      s_idx = cb->args[0];
      s_ip_idx = ip_idx = cb->args[1];

      idx = 0;
      for_each_netdev(net, dev) {
            if (idx < s_idx)
                  goto cont;
            if (idx > s_idx)
                  s_ip_idx = 0;
            ip_idx = 0;
            if ((idev = in6_dev_get(dev)) == NULL)
                  goto cont;
            read_lock_bh(&idev->lock);
            switch (type) {
            case UNICAST_ADDR:
                  /* unicast address incl. temp addr */
                  for (ifa = idev->addr_list; ifa;
                       ifa = ifa->if_next, ip_idx++) {
                        if (ip_idx < s_ip_idx)
                              continue;
                        err = inet6_fill_ifaddr(skb, ifa,
                                          NETLINK_CB(cb->skb).pid,
                                          cb->nlh->nlmsg_seq,
                                          RTM_NEWADDR,
                                          NLM_F_MULTI);
                  }
                  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).pid,
                                            cb->nlh->nlmsg_seq,
                                            RTM_GETMULTICAST,
                                            NLM_F_MULTI);
                  }
                  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).pid,
                                            cb->nlh->nlmsg_seq,
                                            RTM_GETANYCAST,
                                            NLM_F_MULTI);
                  }
                  break;
            default:
                  break;
            }
            read_unlock_bh(&idev->lock);
            in6_dev_put(idev);

            if (err <= 0)
                  break;
cont:
            idx++;
      }
      cb->args[0] = idx;
      cb->args[1] = 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,
                       void *arg)
{
      struct net *net = sock_net(in_skb->sk);
      struct ifaddrmsg *ifm;
      struct nlattr *tb[IFA_MAX+1];
      struct in6_addr *addr = NULL;
      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]);
      if (addr == NULL) {
            err = -EINVAL;
            goto errout;
      }

      ifm = nlmsg_data(nlh);
      if (ifm->ifa_index)
            dev = __dev_get_by_index(net, ifm->ifa_index);

      if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
            err = -EADDRNOTAVAIL;
            goto errout;
      }

      if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
            err = -ENOBUFS;
            goto errout_ifa;
      }

      err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
                        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).pid);
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 == NULL)
            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] = cnf->rtr_solicit_interval;
      array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
      array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
#ifdef CONFIG_IPV6_PRIVACY
      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;
#endif
      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] = 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;
#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;
}

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( /* IFLA_PROTINFO */
                  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 */
             );
}

static inline void __snmp6_fill_stats(u64 *stats, void **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(snmp_fold_field(mib, i), &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_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
            break;
      case IFLA_INET6_ICMP6STATS:
            __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
            break;
      }
}

static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
                       u32 pid, u32 seq, int event, unsigned int flags)
{
      struct net_device *dev = idev->dev;
      struct nlattr *nla;
      struct ifinfomsg *hdr;
      struct nlmsghdr *nlh;
      void *protoinfo;
      struct ifla_cacheinfo ci;

      nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
      if (nlh == NULL)
            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;

      NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);

      if (dev->addr_len)
            NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);

      NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
      if (dev->ifindex != dev->iflink)
            NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);

      protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
      if (protoinfo == NULL)
            goto nla_put_failure;

      NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);

      ci.max_reasm_len = IPV6_MAXPLEN;
      ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
                + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
      ci.reachable_time = idev->nd_parms->reachable_time;
      ci.retrans_time = idev->nd_parms->retrans_time;
      NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);

      nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
      if (nla == NULL)
            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 == NULL)
            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 == NULL)
            goto nla_put_failure;
      snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));

      nla_nest_end(skb, protoinfo);
      return nlmsg_end(skb, nlh);

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 idx, err;
      int s_idx = cb->args[0];
      struct net_device *dev;
      struct inet6_dev *idev;

      read_lock(&dev_base_lock);
      idx = 0;
      for_each_netdev(net, dev) {
            if (idx < s_idx)
                  goto cont;
            if ((idev = in6_dev_get(dev)) == NULL)
                  goto cont;
            err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
                        cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
            in6_dev_put(idev);
            if (err <= 0)
                  break;
cont:
            idx++;
      }
      read_unlock(&dev_base_lock);
      cb->args[0] = idx;

      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 == NULL)
            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_IFADDR, NULL, GFP_ATOMIC);
      return;
errout:
      if (err < 0)
            rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, 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 pid, u32 seq,
                       int event, unsigned int flags)
{
      struct prefixmsg *pmsg;
      struct nlmsghdr *nlh;
      struct prefix_cacheinfo ci;

      nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
      if (nlh == NULL)
            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;

      NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);

      ci.preferred_time = ntohl(pinfo->prefered);
      ci.valid_time = ntohl(pinfo->valid);
      NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);

      return nlmsg_end(skb, nlh);

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 == NULL)
            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)
{
      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);
            break;
      case RTM_DELADDR:
            if (ifp->idev->cnf.forwarding)
                  addrconf_leave_anycast(ifp);
            addrconf_leave_solict(ifp->idev, &ifp->addr);
            dst_hold(&ifp->rt->u.dst);
            if (ip6_del_rt(ifp->rt))
                  dst_free(&ifp->rt->u.dst);
            break;
      }
}

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(ctl_table *ctl, int write, struct file * filp,
                     void __user *buffer, size_t *lenp, loff_t *ppos)
{
      int *valp = ctl->data;
      int val = *valp;
      int ret;

      ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);

      if (write)
            ret = addrconf_fixup_forwarding(ctl, valp, val);
      return ret;
}

static int addrconf_sysctl_forward_strategy(ctl_table *table,
                                  void __user *oldval,
                                  size_t __user *oldlenp,
                                  void __user *newval, size_t newlen)
{
      int *valp = table->data;
      int val = *valp;
      int new;

      if (!newval || !newlen)
            return 0;
      if (newlen != sizeof(int))
            return -EINVAL;
      if (get_user(new, (int __user *)newval))
            return -EFAULT;
      if (new == *valp)
            return 0;
      if (oldval && oldlenp) {
            size_t len;
            if (get_user(len, oldlenp))
                  return -EFAULT;
            if (len) {
                  if (len > table->maxlen)
                        len = table->maxlen;
                  if (copy_to_user(oldval, valp, len))
                        return -EFAULT;
                  if (put_user(len, oldlenp))
                        return -EFAULT;
            }
      }

      *valp = new;
      return addrconf_fixup_forwarding(table, valp, val);
}

static void dev_disable_change(struct inet6_dev *idev)
{
      if (!idev || !idev->dev)
            return;

      if (idev->cnf.disable_ipv6)
            addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
      else
            addrconf_notify(NULL, NETDEV_UP, idev->dev);
}

static void addrconf_disable_change(struct net *net, __s32 newf)
{
      struct net_device *dev;
      struct inet6_dev *idev;

      read_lock(&dev_base_lock);
      for_each_netdev(net, dev) {
            rcu_read_lock();
            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();
      }
      read_unlock(&dev_base_lock);
}

static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
{
      struct net *net;

      net = (struct net *)table->extra2;

      if (p == &net->ipv6.devconf_dflt->disable_ipv6)
            return 0;

      if (!rtnl_trylock())
            return restart_syscall();

      if (p == &net->ipv6.devconf_all->disable_ipv6) {
            __s32 newf = net->ipv6.devconf_all->disable_ipv6;
            net->ipv6.devconf_dflt->disable_ipv6 = newf;
            addrconf_disable_change(net, newf);
      } else if ((!*p) ^ (!old))
            dev_disable_change((struct inet6_dev *)table->extra1);

      rtnl_unlock();
      return 0;
}

static
int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
                      void __user *buffer, size_t *lenp, loff_t *ppos)
{
      int *valp = ctl->data;
      int val = *valp;
      int ret;

      ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);

      if (write)
            ret = addrconf_disable_ipv6(ctl, valp, val);
      return ret;
}

static struct addrconf_sysctl_table
{
      struct ctl_table_header *sysctl_header;
      ctl_table addrconf_vars[DEVCONF_MAX+1];
      char *dev_name;
} addrconf_sysctl __read_mostly = {
      .sysctl_header = NULL,
      .addrconf_vars = {
            {
                  .ctl_name   =     NET_IPV6_FORWARDING,
                  .procname   =     "forwarding",
                  .data       =     &ipv6_devconf.forwarding,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     addrconf_sysctl_forward,
                  .strategy   =     addrconf_sysctl_forward_strategy,
            },
            {
                  .ctl_name   =     NET_IPV6_HOP_LIMIT,
                  .procname   =     "hop_limit",
                  .data       =     &ipv6_devconf.hop_limit,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_MTU,
                  .procname   =     "mtu",
                  .data       =     &ipv6_devconf.mtu6,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_RA,
                  .procname   =     "accept_ra",
                  .data       =     &ipv6_devconf.accept_ra,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_REDIRECTS,
                  .procname   =     "accept_redirects",
                  .data       =     &ipv6_devconf.accept_redirects,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_AUTOCONF,
                  .procname   =     "autoconf",
                  .data       =     &ipv6_devconf.autoconf,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_DAD_TRANSMITS,
                  .procname   =     "dad_transmits",
                  .data       =     &ipv6_devconf.dad_transmits,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_RTR_SOLICITS,
                  .procname   =     "router_solicitations",
                  .data       =     &ipv6_devconf.rtr_solicits,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_RTR_SOLICIT_INTERVAL,
                  .procname   =     "router_solicitation_interval",
                  .data       =     &ipv6_devconf.rtr_solicit_interval,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec_jiffies,
                  .strategy   =     sysctl_jiffies,
            },
            {
                  .ctl_name   =     NET_IPV6_RTR_SOLICIT_DELAY,
                  .procname   =     "router_solicitation_delay",
                  .data       =     &ipv6_devconf.rtr_solicit_delay,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec_jiffies,
                  .strategy   =     sysctl_jiffies,
            },
            {
                  .ctl_name   =     NET_IPV6_FORCE_MLD_VERSION,
                  .procname   =     "force_mld_version",
                  .data       =     &ipv6_devconf.force_mld_version,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
#ifdef CONFIG_IPV6_PRIVACY
            {
                  .ctl_name   =     NET_IPV6_USE_TEMPADDR,
                  .procname   =     "use_tempaddr",
                  .data       =     &ipv6_devconf.use_tempaddr,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_TEMP_VALID_LFT,
                  .procname   =     "temp_valid_lft",
                  .data       =     &ipv6_devconf.temp_valid_lft,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_TEMP_PREFERED_LFT,
                  .procname   =     "temp_prefered_lft",
                  .data       =     &ipv6_devconf.temp_prefered_lft,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_REGEN_MAX_RETRY,
                  .procname   =     "regen_max_retry",
                  .data       =     &ipv6_devconf.regen_max_retry,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_MAX_DESYNC_FACTOR,
                  .procname   =     "max_desync_factor",
                  .data       =     &ipv6_devconf.max_desync_factor,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
#endif
            {
                  .ctl_name   =     NET_IPV6_MAX_ADDRESSES,
                  .procname   =     "max_addresses",
                  .data       =     &ipv6_devconf.max_addresses,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_RA_DEFRTR,
                  .procname   =     "accept_ra_defrtr",
                  .data       =     &ipv6_devconf.accept_ra_defrtr,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_RA_PINFO,
                  .procname   =     "accept_ra_pinfo",
                  .data       =     &ipv6_devconf.accept_ra_pinfo,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
#ifdef CONFIG_IPV6_ROUTER_PREF
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_RA_RTR_PREF,
                  .procname   =     "accept_ra_rtr_pref",
                  .data       =     &ipv6_devconf.accept_ra_rtr_pref,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_RTR_PROBE_INTERVAL,
                  .procname   =     "router_probe_interval",
                  .data       =     &ipv6_devconf.rtr_probe_interval,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec_jiffies,
                  .strategy   =     sysctl_jiffies,
            },
#ifdef CONFIG_IPV6_ROUTE_INFO
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
                  .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
            {
                  .ctl_name   =     NET_IPV6_PROXY_NDP,
                  .procname   =     "proxy_ndp",
                  .data       =     &ipv6_devconf.proxy_ndp,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     NET_IPV6_ACCEPT_SOURCE_ROUTE,
                  .procname   =     "accept_source_route",
                  .data       =     &ipv6_devconf.accept_source_route,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
            {
                  .ctl_name   =     CTL_UNNUMBERED,
                  .procname       =       "optimistic_dad",
                  .data           =       &ipv6_devconf.optimistic_dad,
                  .maxlen         =       sizeof(int),
                  .mode           =       0644,
                  .proc_handler   =       proc_dointvec,

            },
#endif
#ifdef CONFIG_IPV6_MROUTE
            {
                  .ctl_name   =     CTL_UNNUMBERED,
                  .procname   =     "mc_forwarding",
                  .data       =     &ipv6_devconf.mc_forwarding,
                  .maxlen           =     sizeof(int),
                  .mode       =     0444,
                  .proc_handler     =     proc_dointvec,
            },
#endif
            {
                  .ctl_name   =     CTL_UNNUMBERED,
                  .procname   =     "disable_ipv6",
                  .data       =     &ipv6_devconf.disable_ipv6,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     addrconf_sysctl_disable,
                  .strategy   =     sysctl_intvec,
            },
            {
                  .ctl_name   =     CTL_UNNUMBERED,
                  .procname   =     "accept_dad",
                  .data       =     &ipv6_devconf.accept_dad,
                  .maxlen           =     sizeof(int),
                  .mode       =     0644,
                  .proc_handler     =     proc_dointvec,
            },
            {
                  .ctl_name   =     0,    /* sentinel */
            }
      },
};

static int __addrconf_sysctl_register(struct net *net, char *dev_name,
            int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
{
      int i;
      struct addrconf_sysctl_table *t;

#define ADDRCONF_CTL_PATH_DEV 3

      struct ctl_path addrconf_ctl_path[] = {
            { .procname = "net", .ctl_name = CTL_NET, },
            { .procname = "ipv6", .ctl_name = NET_IPV6, },
            { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
            { /* to be set */ },
            { },
      };


      t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
      if (t == NULL)
            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;
      }

      /*
       * Make a copy of dev_name, because '.procname' is regarded as const
       * by sysctl and we wouldn't want anyone to change it under our feet
       * (see SIOCSIFNAME).
       */
      t->dev_name = kstrdup(dev_name, GFP_KERNEL);
      if (!t->dev_name)
            goto free;

      addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
      addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;

      t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
                  t->addrconf_vars);
      if (t->sysctl_header == NULL)
            goto free_procname;

      p->sysctl = t;
      return 0;

free_procname:
      kfree(t->dev_name);
free:
      kfree(t);
out:
      return -ENOBUFS;
}

static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
{
      struct addrconf_sysctl_table *t;

      if (p->sysctl == NULL)
            return;

      t = p->sysctl;
      p->sysctl = NULL;
      unregister_sysctl_table(t->sysctl_header);
      kfree(t->dev_name);
      kfree(t);
}

static void addrconf_sysctl_register(struct inet6_dev *idev)
{
      neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
                        NET_IPV6_NEIGH, "ipv6",
                        &ndisc_ifinfo_sysctl_change,
                        ndisc_ifinfo_sysctl_strategy);
      __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
                  idev->dev->ifindex, idev, &idev->cnf);
}

static void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
      __addrconf_sysctl_unregister(&idev->cnf);
      neigh_sysctl_unregister(idev->nd_parms);
}


#endif

static int addrconf_init_net(struct net *net)
{
      int err;
      struct ipv6_devconf *all, *dflt;

      err = -ENOMEM;
      all = &ipv6_devconf;
      dflt = &ipv6_devconf_dflt;

      if (net != &init_net) {
            all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
            if (all == NULL)
                  goto err_alloc_all;

            dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
            if (dflt == NULL)
                  goto err_alloc_dflt;
      } else {
            /* these will be inherited by all namespaces */
            dflt->autoconf = ipv6_defaults.autoconf;
            dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
      }

      net->ipv6.devconf_all = all;
      net->ipv6.devconf_dflt = dflt;

#ifdef CONFIG_SYSCTL
      err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
                  NULL, all);
      if (err < 0)
            goto err_reg_all;

      err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_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 addrconf_exit_net(struct net *net)
{
#ifdef CONFIG_SYSCTL
      __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
      __addrconf_sysctl_unregister(net->ipv6.devconf_all);
#endif
      if (net != &init_net) {
            kfree(net->ipv6.devconf_dflt);
            kfree(net->ipv6.devconf_all);
      }
}

static struct pernet_operations addrconf_ops = {
      .init = addrconf_init_net,
      .exit = addrconf_exit_net,
};

/*
 *      Device notifier
 */

int register_inet6addr_notifier(struct notifier_block *nb)
{
      return atomic_notifier_chain_register(&inet6addr_chain, nb);
}

EXPORT_SYMBOL(register_inet6addr_notifier);

int unregister_inet6addr_notifier(struct notifier_block *nb)
{
      return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
}

EXPORT_SYMBOL(unregister_inet6addr_notifier);

/*
 *    Init / cleanup code
 */

int __init addrconf_init(void)
{
      int err;

      if ((err = ipv6_addr_label_init()) < 0) {
            printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
                  err);
            return err;
      }

      register_pernet_subsys(&addrconf_ops);

      /* 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();
      if (!ipv6_add_dev(init_net.loopback_dev))
            err = -ENOMEM;
      rtnl_unlock();
      if (err)
            goto errlo;

      register_netdevice_notifier(&ipv6_dev_notf);

      addrconf_verify(0);

      err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
      if (err < 0)
            goto errout;

      /* Only the first call to __rtnl_register can fail */
      __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
      __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
      __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
      __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
      __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);

      ipv6_addr_label_rtnl_register();

      return 0;
errout:
      unregister_netdevice_notifier(&ipv6_dev_notf);
errlo:
      unregister_pernet_subsys(&addrconf_ops);

      return err;
}

void addrconf_cleanup(void)
{
      struct inet6_ifaddr *ifa;
      struct net_device *dev;
      int i;

      unregister_netdevice_notifier(&ipv6_dev_notf);
      unregister_pernet_subsys(&addrconf_ops);

      rtnl_lock();

      /* 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.
       */
      write_lock_bh(&addrconf_hash_lock);
      for (i=0; i < IN6_ADDR_HSIZE; i++) {
            for (ifa=inet6_addr_lst[i]; ifa; ) {
                  struct inet6_ifaddr *bifa;

                  bifa = ifa;
                  ifa = ifa->lst_next;
                  printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
                  /* Do not free it; something is wrong.
                     Now we can investigate it with debugger.
                   */
            }
      }
      write_unlock_bh(&addrconf_hash_lock);

      del_timer(&addr_chk_timer);
      rtnl_unlock();
}

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