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devinet.c

/*
 *    NET3  IP device support routines.
 *
 *    Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $
 *
 *          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.
 *
 *    Derived from the IP parts of dev.c 1.0.19
 *          Authors:    Ross Biro
 *                      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *                      Mark Evans, <evansmp@uhura.aston.ac.uk>
 *
 *    Additional Authors:
 *          Alan Cox, <gw4pts@gw4pts.ampr.org>
 *          Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *    Changes:
 *          Alexey Kuznetsov: pa_* fields are replaced with ifaddr
 *                            lists.
 *          Cyrus Durgin:           updated for kmod
 *          Matthias Andree:  in devinet_ioctl, compare label and
 *                            address (4.4BSD alias style support),
 *                            fall back to comparing just the label
 *                            if no match found.
 */


#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_addr.h>
#include <linux/if_ether.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/kmod.h>

#include <net/arp.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/ip_fib.h>
#include <net/rtnetlink.h>

struct ipv4_devconf ipv4_devconf = {
      .data = {
            [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
            [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
            [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
            [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
      },
};

static struct ipv4_devconf ipv4_devconf_dflt = {
      .data = {
            [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1,
            [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1,
            [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1,
            [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1,
            [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
      },
};

#define IPV4_DEVCONF_DFLT(attr) IPV4_DEVCONF(ipv4_devconf_dflt, attr)

static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
      [IFA_LOCAL]       = { .type = NLA_U32 },
      [IFA_ADDRESS]     = { .type = NLA_U32 },
      [IFA_BROADCAST]   = { .type = NLA_U32 },
      [IFA_ANYCAST]     = { .type = NLA_U32 },
      [IFA_LABEL]       = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
};

static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);

static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
                   int destroy);
#ifdef CONFIG_SYSCTL
static void devinet_sysctl_register(struct in_device *in_dev,
                            struct ipv4_devconf *p);
static void devinet_sysctl_unregister(struct ipv4_devconf *p);
#endif

/* Locks all the inet devices. */

static struct in_ifaddr *inet_alloc_ifa(void)
{
      struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);

      if (ifa) {
            INIT_RCU_HEAD(&ifa->rcu_head);
      }

      return ifa;
}

static void inet_rcu_free_ifa(struct rcu_head *head)
{
      struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
      if (ifa->ifa_dev)
            in_dev_put(ifa->ifa_dev);
      kfree(ifa);
}

static inline void inet_free_ifa(struct in_ifaddr *ifa)
{
      call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
}

void in_dev_finish_destroy(struct in_device *idev)
{
      struct net_device *dev = idev->dev;

      BUG_TRAP(!idev->ifa_list);
      BUG_TRAP(!idev->mc_list);
#ifdef NET_REFCNT_DEBUG
      printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n",
             idev, dev ? dev->name : "NIL");
#endif
      dev_put(dev);
      if (!idev->dead)
            printk("Freeing alive in_device %p\n", idev);
      else {
            kfree(idev);
      }
}

static struct in_device *inetdev_init(struct net_device *dev)
{
      struct in_device *in_dev;

      ASSERT_RTNL();

      in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
      if (!in_dev)
            goto out;
      INIT_RCU_HEAD(&in_dev->rcu_head);
      memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf));
      in_dev->cnf.sysctl = NULL;
      in_dev->dev = dev;
      if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL)
            goto out_kfree;
      /* Reference in_dev->dev */
      dev_hold(dev);
#ifdef CONFIG_SYSCTL
      neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
                        NET_IPV4_NEIGH, "ipv4", NULL, NULL);
#endif

      /* Account for reference dev->ip_ptr (below) */
      in_dev_hold(in_dev);

#ifdef CONFIG_SYSCTL
      devinet_sysctl_register(in_dev, &in_dev->cnf);
#endif
      ip_mc_init_dev(in_dev);
      if (dev->flags & IFF_UP)
            ip_mc_up(in_dev);

      /* we can receive as soon as ip_ptr is set -- do this last */
      rcu_assign_pointer(dev->ip_ptr, in_dev);
out:
      return in_dev;
out_kfree:
      kfree(in_dev);
      in_dev = NULL;
      goto out;
}

static void in_dev_rcu_put(struct rcu_head *head)
{
      struct in_device *idev = container_of(head, struct in_device, rcu_head);
      in_dev_put(idev);
}

static void inetdev_destroy(struct in_device *in_dev)
{
      struct in_ifaddr *ifa;
      struct net_device *dev;

      ASSERT_RTNL();

      dev = in_dev->dev;

      in_dev->dead = 1;

      ip_mc_destroy_dev(in_dev);

      while ((ifa = in_dev->ifa_list) != NULL) {
            inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
            inet_free_ifa(ifa);
      }

#ifdef CONFIG_SYSCTL
      devinet_sysctl_unregister(&in_dev->cnf);
#endif

      dev->ip_ptr = NULL;

#ifdef CONFIG_SYSCTL
      neigh_sysctl_unregister(in_dev->arp_parms);
#endif
      neigh_parms_release(&arp_tbl, in_dev->arp_parms);
      arp_ifdown(dev);

      call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
}

int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
{
      rcu_read_lock();
      for_primary_ifa(in_dev) {
            if (inet_ifa_match(a, ifa)) {
                  if (!b || inet_ifa_match(b, ifa)) {
                        rcu_read_unlock();
                        return 1;
                  }
            }
      } endfor_ifa(in_dev);
      rcu_read_unlock();
      return 0;
}

static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
                   int destroy, struct nlmsghdr *nlh, u32 pid)
{
      struct in_ifaddr *promote = NULL;
      struct in_ifaddr *ifa, *ifa1 = *ifap;
      struct in_ifaddr *last_prim = in_dev->ifa_list;
      struct in_ifaddr *prev_prom = NULL;
      int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);

      ASSERT_RTNL();

      /* 1. Deleting primary ifaddr forces deletion all secondaries
       * unless alias promotion is set
       **/

      if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
            struct in_ifaddr **ifap1 = &ifa1->ifa_next;

            while ((ifa = *ifap1) != NULL) {
                  if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
                      ifa1->ifa_scope <= ifa->ifa_scope)
                        last_prim = ifa;

                  if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
                      ifa1->ifa_mask != ifa->ifa_mask ||
                      !inet_ifa_match(ifa1->ifa_address, ifa)) {
                        ifap1 = &ifa->ifa_next;
                        prev_prom = ifa;
                        continue;
                  }

                  if (!do_promote) {
                        *ifap1 = ifa->ifa_next;

                        rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid);
                        blocking_notifier_call_chain(&inetaddr_chain,
                                    NETDEV_DOWN, ifa);
                        inet_free_ifa(ifa);
                  } else {
                        promote = ifa;
                        break;
                  }
            }
      }

      /* 2. Unlink it */

      *ifap = ifa1->ifa_next;

      /* 3. Announce address deletion */

      /* Send message first, then call notifier.
         At first sight, FIB update triggered by notifier
         will refer to already deleted ifaddr, that could confuse
         netlink listeners. It is not true: look, gated sees
         that route deleted and if it still thinks that ifaddr
         is valid, it will try to restore deleted routes... Grr.
         So that, this order is correct.
       */
      rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid);
      blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);

      if (promote) {

            if (prev_prom) {
                  prev_prom->ifa_next = promote->ifa_next;
                  promote->ifa_next = last_prim->ifa_next;
                  last_prim->ifa_next = promote;
            }

            promote->ifa_flags &= ~IFA_F_SECONDARY;
            rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid);
            blocking_notifier_call_chain(&inetaddr_chain,
                        NETDEV_UP, promote);
            for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
                  if (ifa1->ifa_mask != ifa->ifa_mask ||
                      !inet_ifa_match(ifa1->ifa_address, ifa))
                              continue;
                  fib_add_ifaddr(ifa);
            }

      }
      if (destroy)
            inet_free_ifa(ifa1);
}

static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
                   int destroy)
{
      __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
}

static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
                       u32 pid)
{
      struct in_device *in_dev = ifa->ifa_dev;
      struct in_ifaddr *ifa1, **ifap, **last_primary;

      ASSERT_RTNL();

      if (!ifa->ifa_local) {
            inet_free_ifa(ifa);
            return 0;
      }

      ifa->ifa_flags &= ~IFA_F_SECONDARY;
      last_primary = &in_dev->ifa_list;

      for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
           ifap = &ifa1->ifa_next) {
            if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
                ifa->ifa_scope <= ifa1->ifa_scope)
                  last_primary = &ifa1->ifa_next;
            if (ifa1->ifa_mask == ifa->ifa_mask &&
                inet_ifa_match(ifa1->ifa_address, ifa)) {
                  if (ifa1->ifa_local == ifa->ifa_local) {
                        inet_free_ifa(ifa);
                        return -EEXIST;
                  }
                  if (ifa1->ifa_scope != ifa->ifa_scope) {
                        inet_free_ifa(ifa);
                        return -EINVAL;
                  }
                  ifa->ifa_flags |= IFA_F_SECONDARY;
            }
      }

      if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
            net_srandom(ifa->ifa_local);
            ifap = last_primary;
      }

      ifa->ifa_next = *ifap;
      *ifap = ifa;

      /* Send message first, then call notifier.
         Notifier will trigger FIB update, so that
         listeners of netlink will know about new ifaddr */
      rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid);
      blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);

      return 0;
}

static int inet_insert_ifa(struct in_ifaddr *ifa)
{
      return __inet_insert_ifa(ifa, NULL, 0);
}

static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
{
      struct in_device *in_dev = __in_dev_get_rtnl(dev);

      ASSERT_RTNL();

      if (!in_dev) {
            inet_free_ifa(ifa);
            return -ENOBUFS;
      }
      ipv4_devconf_setall(in_dev);
      if (ifa->ifa_dev != in_dev) {
            BUG_TRAP(!ifa->ifa_dev);
            in_dev_hold(in_dev);
            ifa->ifa_dev = in_dev;
      }
      if (LOOPBACK(ifa->ifa_local))
            ifa->ifa_scope = RT_SCOPE_HOST;
      return inet_insert_ifa(ifa);
}

struct in_device *inetdev_by_index(int ifindex)
{
      struct net_device *dev;
      struct in_device *in_dev = NULL;
      read_lock(&dev_base_lock);
      dev = __dev_get_by_index(&init_net, ifindex);
      if (dev)
            in_dev = in_dev_get(dev);
      read_unlock(&dev_base_lock);
      return in_dev;
}

/* Called only from RTNL semaphored context. No locks. */

struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
                            __be32 mask)
{
      ASSERT_RTNL();

      for_primary_ifa(in_dev) {
            if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
                  return ifa;
      } endfor_ifa(in_dev);
      return NULL;
}

static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
      struct nlattr *tb[IFA_MAX+1];
      struct in_device *in_dev;
      struct ifaddrmsg *ifm;
      struct in_ifaddr *ifa, **ifap;
      int err = -EINVAL;

      ASSERT_RTNL();

      err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
      if (err < 0)
            goto errout;

      ifm = nlmsg_data(nlh);
      in_dev = inetdev_by_index(ifm->ifa_index);
      if (in_dev == NULL) {
            err = -ENODEV;
            goto errout;
      }

      __in_dev_put(in_dev);

      for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
           ifap = &ifa->ifa_next) {
            if (tb[IFA_LOCAL] &&
                ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL]))
                  continue;

            if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
                  continue;

            if (tb[IFA_ADDRESS] &&
                (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
                !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa)))
                  continue;

            __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid);
            return 0;
      }

      err = -EADDRNOTAVAIL;
errout:
      return err;
}

static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
{
      struct nlattr *tb[IFA_MAX+1];
      struct in_ifaddr *ifa;
      struct ifaddrmsg *ifm;
      struct net_device *dev;
      struct in_device *in_dev;
      int err = -EINVAL;

      err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
      if (err < 0)
            goto errout;

      ifm = nlmsg_data(nlh);
      if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) {
            err = -EINVAL;
            goto errout;
      }

      dev = __dev_get_by_index(&init_net, ifm->ifa_index);
      if (dev == NULL) {
            err = -ENODEV;
            goto errout;
      }

      in_dev = __in_dev_get_rtnl(dev);
      if (in_dev == NULL) {
            err = -ENOBUFS;
            goto errout;
      }

      ifa = inet_alloc_ifa();
      if (ifa == NULL) {
            /*
             * A potential indev allocation can be left alive, it stays
             * assigned to its device and is destroy with it.
             */
            err = -ENOBUFS;
            goto errout;
      }

      ipv4_devconf_setall(in_dev);
      in_dev_hold(in_dev);

      if (tb[IFA_ADDRESS] == NULL)
            tb[IFA_ADDRESS] = tb[IFA_LOCAL];

      ifa->ifa_prefixlen = ifm->ifa_prefixlen;
      ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
      ifa->ifa_flags = ifm->ifa_flags;
      ifa->ifa_scope = ifm->ifa_scope;
      ifa->ifa_dev = in_dev;

      ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]);
      ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]);

      if (tb[IFA_BROADCAST])
            ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]);

      if (tb[IFA_ANYCAST])
            ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]);

      if (tb[IFA_LABEL])
            nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
      else
            memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);

      return ifa;

errout:
      return ERR_PTR(err);
}

static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
      struct in_ifaddr *ifa;

      ASSERT_RTNL();

      ifa = rtm_to_ifaddr(nlh);
      if (IS_ERR(ifa))
            return PTR_ERR(ifa);

      return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid);
}

/*
 *    Determine a default network mask, based on the IP address.
 */

static __inline__ int inet_abc_len(__be32 addr)
{
      int rc = -1;      /* Something else, probably a multicast. */

      if (ZERONET(addr))
            rc = 0;
      else {
            __u32 haddr = ntohl(addr);

            if (IN_CLASSA(haddr))
                  rc = 8;
            else if (IN_CLASSB(haddr))
                  rc = 16;
            else if (IN_CLASSC(haddr))
                  rc = 24;
      }

      return rc;
}


int devinet_ioctl(unsigned int cmd, void __user *arg)
{
      struct ifreq ifr;
      struct sockaddr_in sin_orig;
      struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
      struct in_device *in_dev;
      struct in_ifaddr **ifap = NULL;
      struct in_ifaddr *ifa = NULL;
      struct net_device *dev;
      char *colon;
      int ret = -EFAULT;
      int tryaddrmatch = 0;

      /*
       *    Fetch the caller's info block into kernel space
       */

      if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
            goto out;
      ifr.ifr_name[IFNAMSIZ - 1] = 0;

      /* save original address for comparison */
      memcpy(&sin_orig, sin, sizeof(*sin));

      colon = strchr(ifr.ifr_name, ':');
      if (colon)
            *colon = 0;

#ifdef CONFIG_KMOD
      dev_load(&init_net, ifr.ifr_name);
#endif

      switch (cmd) {
      case SIOCGIFADDR: /* Get interface address */
      case SIOCGIFBRDADDR:    /* Get the broadcast address */
      case SIOCGIFDSTADDR:    /* Get the destination address */
      case SIOCGIFNETMASK:    /* Get the netmask for the interface */
            /* Note that these ioctls will not sleep,
               so that we do not impose a lock.
               One day we will be forced to put shlock here (I mean SMP)
             */
            tryaddrmatch = (sin_orig.sin_family == AF_INET);
            memset(sin, 0, sizeof(*sin));
            sin->sin_family = AF_INET;
            break;

      case SIOCSIFFLAGS:
            ret = -EACCES;
            if (!capable(CAP_NET_ADMIN))
                  goto out;
            break;
      case SIOCSIFADDR: /* Set interface address (and family) */
      case SIOCSIFBRDADDR:    /* Set the broadcast address */
      case SIOCSIFDSTADDR:    /* Set the destination address */
      case SIOCSIFNETMASK:    /* Set the netmask for the interface */
            ret = -EACCES;
            if (!capable(CAP_NET_ADMIN))
                  goto out;
            ret = -EINVAL;
            if (sin->sin_family != AF_INET)
                  goto out;
            break;
      default:
            ret = -EINVAL;
            goto out;
      }

      rtnl_lock();

      ret = -ENODEV;
      if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
            goto done;

      if (colon)
            *colon = ':';

      if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) {
            if (tryaddrmatch) {
                  /* Matthias Andree */
                  /* compare label and address (4.4BSD style) */
                  /* note: we only do this for a limited set of ioctls
                     and only if the original address family was AF_INET.
                     This is checked above. */
                  for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
                       ifap = &ifa->ifa_next) {
                        if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
                            sin_orig.sin_addr.s_addr ==
                                          ifa->ifa_address) {
                              break; /* found */
                        }
                  }
            }
            /* we didn't get a match, maybe the application is
               4.3BSD-style and passed in junk so we fall back to
               comparing just the label */
            if (!ifa) {
                  for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
                       ifap = &ifa->ifa_next)
                        if (!strcmp(ifr.ifr_name, ifa->ifa_label))
                              break;
            }
      }

      ret = -EADDRNOTAVAIL;
      if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
            goto done;

      switch (cmd) {
      case SIOCGIFADDR: /* Get interface address */
            sin->sin_addr.s_addr = ifa->ifa_local;
            goto rarok;

      case SIOCGIFBRDADDR:    /* Get the broadcast address */
            sin->sin_addr.s_addr = ifa->ifa_broadcast;
            goto rarok;

      case SIOCGIFDSTADDR:    /* Get the destination address */
            sin->sin_addr.s_addr = ifa->ifa_address;
            goto rarok;

      case SIOCGIFNETMASK:    /* Get the netmask for the interface */
            sin->sin_addr.s_addr = ifa->ifa_mask;
            goto rarok;

      case SIOCSIFFLAGS:
            if (colon) {
                  ret = -EADDRNOTAVAIL;
                  if (!ifa)
                        break;
                  ret = 0;
                  if (!(ifr.ifr_flags & IFF_UP))
                        inet_del_ifa(in_dev, ifap, 1);
                  break;
            }
            ret = dev_change_flags(dev, ifr.ifr_flags);
            break;

      case SIOCSIFADDR: /* Set interface address (and family) */
            ret = -EINVAL;
            if (inet_abc_len(sin->sin_addr.s_addr) < 0)
                  break;

            if (!ifa) {
                  ret = -ENOBUFS;
                  if ((ifa = inet_alloc_ifa()) == NULL)
                        break;
                  if (colon)
                        memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
                  else
                        memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
            } else {
                  ret = 0;
                  if (ifa->ifa_local == sin->sin_addr.s_addr)
                        break;
                  inet_del_ifa(in_dev, ifap, 0);
                  ifa->ifa_broadcast = 0;
                  ifa->ifa_anycast = 0;
            }

            ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;

            if (!(dev->flags & IFF_POINTOPOINT)) {
                  ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
                  ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
                  if ((dev->flags & IFF_BROADCAST) &&
                      ifa->ifa_prefixlen < 31)
                        ifa->ifa_broadcast = ifa->ifa_address |
                                         ~ifa->ifa_mask;
            } else {
                  ifa->ifa_prefixlen = 32;
                  ifa->ifa_mask = inet_make_mask(32);
            }
            ret = inet_set_ifa(dev, ifa);
            break;

      case SIOCSIFBRDADDR:    /* Set the broadcast address */
            ret = 0;
            if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
                  inet_del_ifa(in_dev, ifap, 0);
                  ifa->ifa_broadcast = sin->sin_addr.s_addr;
                  inet_insert_ifa(ifa);
            }
            break;

      case SIOCSIFDSTADDR:    /* Set the destination address */
            ret = 0;
            if (ifa->ifa_address == sin->sin_addr.s_addr)
                  break;
            ret = -EINVAL;
            if (inet_abc_len(sin->sin_addr.s_addr) < 0)
                  break;
            ret = 0;
            inet_del_ifa(in_dev, ifap, 0);
            ifa->ifa_address = sin->sin_addr.s_addr;
            inet_insert_ifa(ifa);
            break;

      case SIOCSIFNETMASK:    /* Set the netmask for the interface */

            /*
             *    The mask we set must be legal.
             */
            ret = -EINVAL;
            if (bad_mask(sin->sin_addr.s_addr, 0))
                  break;
            ret = 0;
            if (ifa->ifa_mask != sin->sin_addr.s_addr) {
                  __be32 old_mask = ifa->ifa_mask;
                  inet_del_ifa(in_dev, ifap, 0);
                  ifa->ifa_mask = sin->sin_addr.s_addr;
                  ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);

                  /* See if current broadcast address matches
                   * with current netmask, then recalculate
                   * the broadcast address. Otherwise it's a
                   * funny address, so don't touch it since
                   * the user seems to know what (s)he's doing...
                   */
                  if ((dev->flags & IFF_BROADCAST) &&
                      (ifa->ifa_prefixlen < 31) &&
                      (ifa->ifa_broadcast ==
                       (ifa->ifa_local|~old_mask))) {
                        ifa->ifa_broadcast = (ifa->ifa_local |
                                          ~sin->sin_addr.s_addr);
                  }
                  inet_insert_ifa(ifa);
            }
            break;
      }
done:
      rtnl_unlock();
out:
      return ret;
rarok:
      rtnl_unlock();
      ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
      goto out;
}

static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
{
      struct in_device *in_dev = __in_dev_get_rtnl(dev);
      struct in_ifaddr *ifa;
      struct ifreq ifr;
      int done = 0;

      if (!in_dev || (ifa = in_dev->ifa_list) == NULL)
            goto out;

      for (; ifa; ifa = ifa->ifa_next) {
            if (!buf) {
                  done += sizeof(ifr);
                  continue;
            }
            if (len < (int) sizeof(ifr))
                  break;
            memset(&ifr, 0, sizeof(struct ifreq));
            if (ifa->ifa_label)
                  strcpy(ifr.ifr_name, ifa->ifa_label);
            else
                  strcpy(ifr.ifr_name, dev->name);

            (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
            (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
                                                ifa->ifa_local;

            if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
                  done = -EFAULT;
                  break;
            }
            buf  += sizeof(struct ifreq);
            len  -= sizeof(struct ifreq);
            done += sizeof(struct ifreq);
      }
out:
      return done;
}

__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
{
      __be32 addr = 0;
      struct in_device *in_dev;

      rcu_read_lock();
      in_dev = __in_dev_get_rcu(dev);
      if (!in_dev)
            goto no_in_dev;

      for_primary_ifa(in_dev) {
            if (ifa->ifa_scope > scope)
                  continue;
            if (!dst || inet_ifa_match(dst, ifa)) {
                  addr = ifa->ifa_local;
                  break;
            }
            if (!addr)
                  addr = ifa->ifa_local;
      } endfor_ifa(in_dev);
no_in_dev:
      rcu_read_unlock();

      if (addr)
            goto out;

      /* Not loopback addresses on loopback should be preferred
         in this case. It is importnat that lo is the first interface
         in dev_base list.
       */
      read_lock(&dev_base_lock);
      rcu_read_lock();
      for_each_netdev(&init_net, dev) {
            if ((in_dev = __in_dev_get_rcu(dev)) == NULL)
                  continue;

            for_primary_ifa(in_dev) {
                  if (ifa->ifa_scope != RT_SCOPE_LINK &&
                      ifa->ifa_scope <= scope) {
                        addr = ifa->ifa_local;
                        goto out_unlock_both;
                  }
            } endfor_ifa(in_dev);
      }
out_unlock_both:
      read_unlock(&dev_base_lock);
      rcu_read_unlock();
out:
      return addr;
}

static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
                        __be32 local, int scope)
{
      int same = 0;
      __be32 addr = 0;

      for_ifa(in_dev) {
            if (!addr &&
                (local == ifa->ifa_local || !local) &&
                ifa->ifa_scope <= scope) {
                  addr = ifa->ifa_local;
                  if (same)
                        break;
            }
            if (!same) {
                  same = (!local || inet_ifa_match(local, ifa)) &&
                        (!dst || inet_ifa_match(dst, ifa));
                  if (same && addr) {
                        if (local || !dst)
                              break;
                        /* Is the selected addr into dst subnet? */
                        if (inet_ifa_match(addr, ifa))
                              break;
                        /* No, then can we use new local src? */
                        if (ifa->ifa_scope <= scope) {
                              addr = ifa->ifa_local;
                              break;
                        }
                        /* search for large dst subnet for addr */
                        same = 0;
                  }
            }
      } endfor_ifa(in_dev);

      return same? addr : 0;
}

/*
 * Confirm that local IP address exists using wildcards:
 * - dev: only on this interface, 0=any interface
 * - dst: only in the same subnet as dst, 0=any dst
 * - local: address, 0=autoselect the local address
 * - scope: maximum allowed scope value for the local address
 */
__be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope)
{
      __be32 addr = 0;
      struct in_device *in_dev;

      if (dev) {
            rcu_read_lock();
            if ((in_dev = __in_dev_get_rcu(dev)))
                  addr = confirm_addr_indev(in_dev, dst, local, scope);
            rcu_read_unlock();

            return addr;
      }

      read_lock(&dev_base_lock);
      rcu_read_lock();
      for_each_netdev(&init_net, dev) {
            if ((in_dev = __in_dev_get_rcu(dev))) {
                  addr = confirm_addr_indev(in_dev, dst, local, scope);
                  if (addr)
                        break;
            }
      }
      rcu_read_unlock();
      read_unlock(&dev_base_lock);

      return addr;
}

/*
 *    Device notifier
 */

int register_inetaddr_notifier(struct notifier_block *nb)
{
      return blocking_notifier_chain_register(&inetaddr_chain, nb);
}

int unregister_inetaddr_notifier(struct notifier_block *nb)
{
      return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
}

/* Rename ifa_labels for a device name change. Make some effort to preserve existing
 * alias numbering and to create unique labels if possible.
*/
static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
{
      struct in_ifaddr *ifa;
      int named = 0;

      for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
            char old[IFNAMSIZ], *dot;

            memcpy(old, ifa->ifa_label, IFNAMSIZ);
            memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
            if (named++ == 0)
                  continue;
            dot = strchr(old, ':');
            if (dot == NULL) {
                  sprintf(old, ":%d", named);
                  dot = old;
            }
            if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) {
                  strcat(ifa->ifa_label, dot);
            } else {
                  strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
            }
      }
}

/* Called only under RTNL semaphore */

static int inetdev_event(struct notifier_block *this, unsigned long event,
                   void *ptr)
{
      struct net_device *dev = ptr;
      struct in_device *in_dev = __in_dev_get_rtnl(dev);

      if (dev->nd_net != &init_net)
            return NOTIFY_DONE;

      ASSERT_RTNL();

      if (!in_dev) {
            if (event == NETDEV_REGISTER) {
                  in_dev = inetdev_init(dev);
                  if (!in_dev)
                        return notifier_from_errno(-ENOMEM);
                  if (dev->flags & IFF_LOOPBACK) {
                        IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
                        IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
                  }
            }
            goto out;
      }

      switch (event) {
      case NETDEV_REGISTER:
            printk(KERN_DEBUG "inetdev_event: bug\n");
            dev->ip_ptr = NULL;
            break;
      case NETDEV_UP:
            if (dev->mtu < 68)
                  break;
            if (dev->flags & IFF_LOOPBACK) {
                  struct in_ifaddr *ifa;
                  if ((ifa = inet_alloc_ifa()) != NULL) {
                        ifa->ifa_local =
                          ifa->ifa_address = htonl(INADDR_LOOPBACK);
                        ifa->ifa_prefixlen = 8;
                        ifa->ifa_mask = inet_make_mask(8);
                        in_dev_hold(in_dev);
                        ifa->ifa_dev = in_dev;
                        ifa->ifa_scope = RT_SCOPE_HOST;
                        memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
                        inet_insert_ifa(ifa);
                  }
            }
            ip_mc_up(in_dev);
            break;
      case NETDEV_DOWN:
            ip_mc_down(in_dev);
            break;
      case NETDEV_CHANGEMTU:
            if (dev->mtu >= 68)
                  break;
            /* MTU falled under 68, disable IP */
      case NETDEV_UNREGISTER:
            inetdev_destroy(in_dev);
            break;
      case NETDEV_CHANGENAME:
            /* Do not notify about label change, this event is
             * not interesting to applications using netlink.
             */
            inetdev_changename(dev, in_dev);

#ifdef CONFIG_SYSCTL
            devinet_sysctl_unregister(&in_dev->cnf);
            neigh_sysctl_unregister(in_dev->arp_parms);
            neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4,
                              NET_IPV4_NEIGH, "ipv4", NULL, NULL);
            devinet_sysctl_register(in_dev, &in_dev->cnf);
#endif
            break;
      }
out:
      return NOTIFY_DONE;
}

static struct notifier_block ip_netdev_notifier = {
      .notifier_call =inetdev_event,
};

static inline size_t inet_nlmsg_size(void)
{
      return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
             + nla_total_size(4) /* IFA_ADDRESS */
             + nla_total_size(4) /* IFA_LOCAL */
             + nla_total_size(4) /* IFA_BROADCAST */
             + nla_total_size(4) /* IFA_ANYCAST */
             + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
}

static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
                      u32 pid, u32 seq, int event, unsigned int flags)
{
      struct ifaddrmsg *ifm;
      struct nlmsghdr  *nlh;

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

      ifm = nlmsg_data(nlh);
      ifm->ifa_family = AF_INET;
      ifm->ifa_prefixlen = ifa->ifa_prefixlen;
      ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
      ifm->ifa_scope = ifa->ifa_scope;
      ifm->ifa_index = ifa->ifa_dev->dev->ifindex;

      if (ifa->ifa_address)
            NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address);

      if (ifa->ifa_local)
            NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local);

      if (ifa->ifa_broadcast)
            NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast);

      if (ifa->ifa_anycast)
            NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast);

      if (ifa->ifa_label[0])
            NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);

      return nlmsg_end(skb, nlh);

nla_put_failure:
      nlmsg_cancel(skb, nlh);
      return -EMSGSIZE;
}

static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
      int idx, ip_idx;
      struct net_device *dev;
      struct in_device *in_dev;
      struct in_ifaddr *ifa;
      int s_ip_idx, s_idx = cb->args[0];

      s_ip_idx = ip_idx = cb->args[1];
      idx = 0;
      for_each_netdev(&init_net, dev) {
            if (idx < s_idx)
                  goto cont;
            if (idx > s_idx)
                  s_ip_idx = 0;
            if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
                  goto cont;

            for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
                 ifa = ifa->ifa_next, ip_idx++) {
                  if (ip_idx < s_ip_idx)
                        continue;
                  if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
                                   cb->nlh->nlmsg_seq,
                                   RTM_NEWADDR, NLM_F_MULTI) <= 0)
                        goto done;
            }
cont:
            idx++;
      }

done:
      cb->args[0] = idx;
      cb->args[1] = ip_idx;

      return skb->len;
}

static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh,
                  u32 pid)
{
      struct sk_buff *skb;
      u32 seq = nlh ? nlh->nlmsg_seq : 0;
      int err = -ENOBUFS;

      skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
      if (skb == NULL)
            goto errout;

      err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0);
      if (err < 0) {
            /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
            WARN_ON(err == -EMSGSIZE);
            kfree_skb(skb);
            goto errout;
      }
      err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
errout:
      if (err < 0)
            rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err);
}

#ifdef CONFIG_SYSCTL

static void devinet_copy_dflt_conf(int i)
{
      struct net_device *dev;

      read_lock(&dev_base_lock);
      for_each_netdev(&init_net, dev) {
            struct in_device *in_dev;
            rcu_read_lock();
            in_dev = __in_dev_get_rcu(dev);
            if (in_dev && !test_bit(i, in_dev->cnf.state))
                  in_dev->cnf.data[i] = ipv4_devconf_dflt.data[i];
            rcu_read_unlock();
      }
      read_unlock(&dev_base_lock);
}

static int devinet_conf_proc(ctl_table *ctl, int write,
                       struct file* filp, void __user *buffer,
                       size_t *lenp, loff_t *ppos)
{
      int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);

      if (write) {
            struct ipv4_devconf *cnf = ctl->extra1;
            int i = (int *)ctl->data - cnf->data;

            set_bit(i, cnf->state);

            if (cnf == &ipv4_devconf_dflt)
                  devinet_copy_dflt_conf(i);
      }

      return ret;
}

static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
                         void __user *oldval, size_t __user *oldlenp,
                         void __user *newval, size_t newlen)
{
      struct ipv4_devconf *cnf;
      int *valp = table->data;
      int new;
      int i;

      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;

      cnf = table->extra1;
      i = (int *)table->data - cnf->data;

      set_bit(i, cnf->state);

      if (cnf == &ipv4_devconf_dflt)
            devinet_copy_dflt_conf(i);

      return 1;
}

void inet_forward_change(void)
{
      struct net_device *dev;
      int on = IPV4_DEVCONF_ALL(FORWARDING);

      IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on;
      IPV4_DEVCONF_DFLT(FORWARDING) = on;

      read_lock(&dev_base_lock);
      for_each_netdev(&init_net, dev) {
            struct in_device *in_dev;
            rcu_read_lock();
            in_dev = __in_dev_get_rcu(dev);
            if (in_dev)
                  IN_DEV_CONF_SET(in_dev, FORWARDING, on);
            rcu_read_unlock();
      }
      read_unlock(&dev_base_lock);

      rt_cache_flush(0);
}

static int devinet_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 = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);

      if (write && *valp != val) {
            if (valp == &IPV4_DEVCONF_ALL(FORWARDING))
                  inet_forward_change();
            else if (valp != &IPV4_DEVCONF_DFLT(FORWARDING))
                  rt_cache_flush(0);
      }

      return ret;
}

int ipv4_doint_and_flush(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 = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);

      if (write && *valp != val)
            rt_cache_flush(0);

      return ret;
}

int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
                          void __user *oldval, size_t __user *oldlenp,
                          void __user *newval, size_t newlen)
{
      int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
                              newval, newlen);

      if (ret == 1)
            rt_cache_flush(0);

      return ret;
}


#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \
      { \
            .ctl_name   = NET_IPV4_CONF_ ## attr, \
            .procname   = name, \
            .data       = ipv4_devconf.data + \
                          NET_IPV4_CONF_ ## attr - 1, \
            .maxlen           = sizeof(int), \
            .mode       = mval, \
            .proc_handler     = proc, \
            .strategy   = sysctl, \
            .extra1           = &ipv4_devconf, \
      }

#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
      DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
                       devinet_conf_sysctl)

#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
      DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
                       devinet_conf_sysctl)

#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
      DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)

#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
      DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \
                             ipv4_doint_and_flush_strategy)

static struct devinet_sysctl_table {
      struct ctl_table_header *sysctl_header;
      ctl_table         devinet_vars[__NET_IPV4_CONF_MAX];
      ctl_table         devinet_dev[2];
      ctl_table         devinet_conf_dir[2];
      ctl_table         devinet_proto_dir[2];
      ctl_table         devinet_root_dir[2];
} devinet_sysctl = {
      .devinet_vars = {
            DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
                                   devinet_sysctl_forward,
                                   devinet_conf_sysctl),
            DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),

            DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
            DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
            DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
            DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
            DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
            DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
                              "accept_source_route"),
            DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
            DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
            DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
            DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
            DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
            DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
            DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
            DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
            DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),

            DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
            DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
            DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION,
                                    "force_igmp_version"),
            DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
                                    "promote_secondaries"),
      },
      .devinet_dev = {
            {
                  .ctl_name   = NET_PROTO_CONF_ALL,
                  .procname   = "all",
                  .mode       = 0555,
                  .child            = devinet_sysctl.devinet_vars,
            },
      },
      .devinet_conf_dir = {
            {
                  .ctl_name   = NET_IPV4_CONF,
                  .procname   = "conf",
                  .mode       = 0555,
                  .child            = devinet_sysctl.devinet_dev,
            },
      },
      .devinet_proto_dir = {
            {
                  .ctl_name   = NET_IPV4,
                  .procname   = "ipv4",
                  .mode       = 0555,
                  .child            = devinet_sysctl.devinet_conf_dir,
            },
      },
      .devinet_root_dir = {
            {
                  .ctl_name   = CTL_NET,
                  .procname   = "net",
                  .mode       = 0555,
                  .child            = devinet_sysctl.devinet_proto_dir,
            },
      },
};

static void devinet_sysctl_register(struct in_device *in_dev,
                            struct ipv4_devconf *p)
{
      int i;
      struct net_device *dev = in_dev ? in_dev->dev : NULL;
      struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t),
                                     GFP_KERNEL);
      char *dev_name = NULL;

      if (!t)
            return;
      for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
            t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
            t->devinet_vars[i].extra1 = p;
      }

      if (dev) {
            dev_name = dev->name;
            t->devinet_dev[0].ctl_name = dev->ifindex;
      } else {
            dev_name = "default";
            t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
      }

      /*
       * 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).
       */
      dev_name = kstrdup(dev_name, GFP_KERNEL);
      if (!dev_name)
          goto free;

      t->devinet_dev[0].procname    = dev_name;
      t->devinet_dev[0].child       = t->devinet_vars;
      t->devinet_conf_dir[0].child  = t->devinet_dev;
      t->devinet_proto_dir[0].child = t->devinet_conf_dir;
      t->devinet_root_dir[0].child  = t->devinet_proto_dir;

      t->sysctl_header = register_sysctl_table(t->devinet_root_dir);
      if (!t->sysctl_header)
          goto free_procname;

      p->sysctl = t;
      return;

      /* error path */
 free_procname:
      kfree(dev_name);
 free:
      kfree(t);
      return;
}

static void devinet_sysctl_unregister(struct ipv4_devconf *p)
{
      if (p->sysctl) {
            struct devinet_sysctl_table *t = p->sysctl;
            p->sysctl = NULL;
            unregister_sysctl_table(t->sysctl_header);
            kfree(t->devinet_dev[0].procname);
            kfree(t);
      }
}
#endif

void __init devinet_init(void)
{
      register_gifconf(PF_INET, inet_gifconf);
      register_netdevice_notifier(&ip_netdev_notifier);

      rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
      rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
      rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
#ifdef CONFIG_SYSCTL
      devinet_sysctl.sysctl_header =
            register_sysctl_table(devinet_sysctl.devinet_root_dir);
      devinet_sysctl_register(NULL, &ipv4_devconf_dflt);
#endif
}

EXPORT_SYMBOL(in_dev_finish_destroy);
EXPORT_SYMBOL(inet_select_addr);
EXPORT_SYMBOL(inetdev_by_index);
EXPORT_SYMBOL(register_inetaddr_notifier);
EXPORT_SYMBOL(unregister_inetaddr_notifier);

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