Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 1673 insertions, 0 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
new file mode 100644
index 0000000..56fce3a
--- /dev/null
+++ b/net/ipv4/devinet.c
@@ -0,0 +1,1673 @@
+/*
+ *	NET3	IP device support routines.
+ *
+ *		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>
+#include <net/net_namespace.h>
+
+static 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(net, attr) \
+	IPV4_DEVCONF((*net->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_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 *idev);
+static void devinet_sysctl_unregister(struct in_device *idev);
+#else
+static inline void devinet_sysctl_register(struct in_device *idev)
+{
+}
+static inline void devinet_sysctl_unregister(struct in_device *idev)
+{
+}
+#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;
+
+	WARN_ON(idev->ifa_list);
+	WARN_ON(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, dev_net(dev)->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;
+	if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
+		dev_disable_lro(dev);
+	/* Reference in_dev->dev */
+	dev_hold(dev);
+	/* Account for reference dev->ip_ptr (below) */
+	in_dev_hold(in_dev);
+
+	devinet_sysctl_register(in_dev);
+	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);
+	}
+
+	dev->ip_ptr = NULL;
+
+	devinet_sysctl_unregister(in_dev);
+	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) {
+		WARN_ON(ifa->ifa_dev);
+		in_dev_hold(in_dev);
+		ifa->ifa_dev = in_dev;
+	}
+	if (ipv4_is_loopback(ifa->ifa_local))
+		ifa->ifa_scope = RT_SCOPE_HOST;
+	return inet_insert_ifa(ifa);
+}
+
+struct in_device *inetdev_by_index(struct net *net, int ifindex)
+{
+	struct net_device *dev;
+	struct in_device *in_dev = NULL;
+	read_lock(&dev_base_lock);
+	dev = __dev_get_by_index(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 net *net = sock_net(skb->sk);
+	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(net, 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 net *net, 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;
+
+	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
+	if (err < 0)
+		goto errout;
+
+	ifm = nlmsg_data(nlh);
+	err = -EINVAL;
+	if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
+		goto errout;
+
+	dev = __dev_get_by_index(net, ifm->ifa_index);
+	err = -ENODEV;
+	if (dev == NULL)
+		goto errout;
+
+	in_dev = __in_dev_get_rtnl(dev);
+	err = -ENOBUFS;
+	if (in_dev == NULL)
+		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.
+		 */
+		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_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 net *net = sock_net(skb->sk);
+	struct in_ifaddr *ifa;
+
+	ASSERT_RTNL();
+
+	ifa = rtm_to_ifaddr(net, 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 (ipv4_is_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(struct net *net, 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;
+
+	dev_load(net, ifr.ifr_name);
+
+	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(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_scope = 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;
+	struct net *net = dev_net(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(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:
+ * - in_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(struct in_device *in_dev,
+			 __be32 dst, __be32 local, int scope)
+{
+	__be32 addr = 0;
+	struct net_device *dev;
+	struct net *net;
+
+	if (scope != RT_SCOPE_LINK)
+		return confirm_addr_indev(in_dev, dst, local, scope);
+
+	net = dev_net(in_dev->dev);
+	read_lock(&dev_base_lock);
+	rcu_read_lock();
+	for_each_netdev(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)
+			goto skip;
+		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);
+		}
+skip:
+		rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
+	}
+}
+
+static inline bool inetdev_valid_mtu(unsigned mtu)
+{
+	return mtu >= 68;
+}
+
+/* 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);
+
+	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);
+			}
+		} else if (event == NETDEV_CHANGEMTU) {
+			/* Re-enabling IP */
+			if (inetdev_valid_mtu(dev->mtu))
+				in_dev = inetdev_init(dev);
+		}
+		goto out;
+	}
+
+	switch (event) {
+	case NETDEV_REGISTER:
+		printk(KERN_DEBUG "inetdev_event: bug\n");
+		dev->ip_ptr = NULL;
+		break;
+	case NETDEV_UP:
+		if (!inetdev_valid_mtu(dev->mtu))
+			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 (inetdev_valid_mtu(dev->mtu))
+			break;
+		/* disable IP when MTU is not enough */
+	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);
+
+		devinet_sysctl_unregister(in_dev);
+		devinet_sysctl_register(in_dev);
+		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(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_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)
+{
+	struct net *net = sock_net(skb->sk);
+	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(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;
+	struct net *net;
+
+	net = dev_net(ifa->ifa_dev->dev);
+	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, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
+errout:
+	if (err < 0)
+		rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
+}
+
+#ifdef CONFIG_SYSCTL
+
+static void devinet_copy_dflt_conf(struct net *net, int i)
+{
+	struct net_device *dev;
+
+	read_lock(&dev_base_lock);
+	for_each_netdev(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] = net->ipv4.devconf_dflt->data[i];
+		rcu_read_unlock();
+	}
+	read_unlock(&dev_base_lock);
+}
+
+static void inet_forward_change(struct net *net)
+{
+	struct net_device *dev;
+	int on = IPV4_DEVCONF_ALL(net, FORWARDING);
+
+	IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
+	IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
+
+	read_lock(&dev_base_lock);
+	for_each_netdev(net, dev) {
+		struct in_device *in_dev;
+		if (on)
+			dev_disable_lro(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);
+}
+
+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;
+		struct net *net = ctl->extra2;
+		int i = (int *)ctl->data - cnf->data;
+
+		set_bit(i, cnf->state);
+
+		if (cnf == net->ipv4.devconf_dflt)
+			devinet_copy_dflt_conf(net, i);
+	}
+
+	return ret;
+}
+
+static int devinet_conf_sysctl(ctl_table *table,
+			       void __user *oldval, size_t __user *oldlenp,
+			       void __user *newval, size_t newlen)
+{
+	struct ipv4_devconf *cnf;
+	struct net *net;
+	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;
+	net = table->extra2;
+	i = (int *)table->data - cnf->data;
+
+	set_bit(i, cnf->state);
+
+	if (cnf == net->ipv4.devconf_dflt)
+		devinet_copy_dflt_conf(net, i);
+
+	return 1;
+}
+
+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) {
+		struct net *net = ctl->extra2;
+
+		if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
+			rtnl_lock();
+			if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
+				inet_forward_change(net);
+			} else if (*valp) {
+				struct ipv4_devconf *cnf = ctl->extra1;
+				struct in_device *idev =
+					container_of(cnf, struct in_device, cnf);
+				dev_disable_lro(idev->dev);
+			}
+			rtnl_unlock();
+			rt_cache_flush(net, 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);
+	struct net *net = ctl->extra2;
+
+	if (write && *valp != val)
+		rt_cache_flush(net, 0);
+
+	return ret;
+}
+
+int ipv4_doint_and_flush_strategy(ctl_table *table,
+				  void __user *oldval, size_t __user *oldlenp,
+				  void __user *newval, size_t newlen)
+{
+	int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen);
+	struct net *net = table->extra2;
+
+	if (ret == 1)
+		rt_cache_flush(net, 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;
+	struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX];
+	char *dev_name;
+} 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"),
+	},
+};
+
+static int __devinet_sysctl_register(struct net *net, char *dev_name,
+		int ctl_name, struct ipv4_devconf *p)
+{
+	int i;
+	struct devinet_sysctl_table *t;
+
+#define DEVINET_CTL_PATH_DEV	3
+
+	struct ctl_path devinet_ctl_path[] = {
+		{ .procname = "net", .ctl_name = CTL_NET, },
+		{ .procname = "ipv4", .ctl_name = NET_IPV4, },
+		{ .procname = "conf", .ctl_name = NET_IPV4_CONF, },
+		{ /* to be set */ },
+		{ },
+	};
+
+	t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
+	if (!t)
+		goto out;
+
+	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;
+		t->devinet_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;
+
+	devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
+	devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
+
+	t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
+			t->devinet_vars);
+	if (!t->sysctl_header)
+		goto free_procname;
+
+	p->sysctl = t;
+	return 0;
+
+free_procname:
+	kfree(t->dev_name);
+free:
+	kfree(t);
+out:
+	return -ENOBUFS;
+}
+
+static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
+{
+	struct devinet_sysctl_table *t = cnf->sysctl;
+
+	if (t == NULL)
+		return;
+
+	cnf->sysctl = NULL;
+	unregister_sysctl_table(t->sysctl_header);
+	kfree(t->dev_name);
+	kfree(t);
+}
+
+static void devinet_sysctl_register(struct in_device *idev)
+{
+	neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4,
+			NET_IPV4_NEIGH, "ipv4", NULL, NULL);
+	__devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
+			idev->dev->ifindex, &idev->cnf);
+}
+
+static void devinet_sysctl_unregister(struct in_device *idev)
+{
+	__devinet_sysctl_unregister(&idev->cnf);
+	neigh_sysctl_unregister(idev->arp_parms);
+}
+
+static struct ctl_table ctl_forward_entry[] = {
+	{
+		.ctl_name	= NET_IPV4_FORWARD,
+		.procname	= "ip_forward",
+		.data		= &ipv4_devconf.data[
+					NET_IPV4_CONF_FORWARDING - 1],
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= devinet_sysctl_forward,
+		.strategy	= devinet_conf_sysctl,
+		.extra1		= &ipv4_devconf,
+		.extra2		= &init_net,
+	},
+	{ },
+};
+
+static __net_initdata struct ctl_path net_ipv4_path[] = {
+	{ .procname = "net", .ctl_name = CTL_NET, },
+	{ .procname = "ipv4", .ctl_name = NET_IPV4, },
+	{ },
+};
+#endif
+
+static __net_init int devinet_init_net(struct net *net)
+{
+	int err;
+	struct ipv4_devconf *all, *dflt;
+#ifdef CONFIG_SYSCTL
+	struct ctl_table *tbl = ctl_forward_entry;
+	struct ctl_table_header *forw_hdr;
+#endif
+
+	err = -ENOMEM;
+	all = &ipv4_devconf;
+	dflt = &ipv4_devconf_dflt;
+
+	if (net != &init_net) {
+		all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
+		if (all == NULL)
+			goto err_alloc_all;
+
+		dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
+		if (dflt == NULL)
+			goto err_alloc_dflt;
+
+#ifdef CONFIG_SYSCTL
+		tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
+		if (tbl == NULL)
+			goto err_alloc_ctl;
+
+		tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
+		tbl[0].extra1 = all;
+		tbl[0].extra2 = net;
+#endif
+	}
+
+#ifdef CONFIG_SYSCTL
+	err = __devinet_sysctl_register(net, "all",
+			NET_PROTO_CONF_ALL, all);
+	if (err < 0)
+		goto err_reg_all;
+
+	err = __devinet_sysctl_register(net, "default",
+			NET_PROTO_CONF_DEFAULT, dflt);
+	if (err < 0)
+		goto err_reg_dflt;
+
+	err = -ENOMEM;
+	forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
+	if (forw_hdr == NULL)
+		goto err_reg_ctl;
+	net->ipv4.forw_hdr = forw_hdr;
+#endif
+
+	net->ipv4.devconf_all = all;
+	net->ipv4.devconf_dflt = dflt;
+	return 0;
+
+#ifdef CONFIG_SYSCTL
+err_reg_ctl:
+	__devinet_sysctl_unregister(dflt);
+err_reg_dflt:
+	__devinet_sysctl_unregister(all);
+err_reg_all:
+	if (tbl != ctl_forward_entry)
+		kfree(tbl);
+err_alloc_ctl:
+#endif
+	if (dflt != &ipv4_devconf_dflt)
+		kfree(dflt);
+err_alloc_dflt:
+	if (all != &ipv4_devconf)
+		kfree(all);
+err_alloc_all:
+	return err;
+}
+
+static __net_exit void devinet_exit_net(struct net *net)
+{
+#ifdef CONFIG_SYSCTL
+	struct ctl_table *tbl;
+
+	tbl = net->ipv4.forw_hdr->ctl_table_arg;
+	unregister_net_sysctl_table(net->ipv4.forw_hdr);
+	__devinet_sysctl_unregister(net->ipv4.devconf_dflt);
+	__devinet_sysctl_unregister(net->ipv4.devconf_all);
+	kfree(tbl);
+#endif
+	kfree(net->ipv4.devconf_dflt);
+	kfree(net->ipv4.devconf_all);
+}
+
+static __net_initdata struct pernet_operations devinet_ops = {
+	.init = devinet_init_net,
+	.exit = devinet_exit_net,
+};
+
+void __init devinet_init(void)
+{
+	register_pernet_subsys(&devinet_ops);
+
+	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);
+}
+
+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);