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Date:	Thu, 25 Jan 2007 12:00:17 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	<netdev@...r.kernel.org>
Cc:	<containers@...ts.osdl.org>, <openib-general@...nib.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH RFC 15/31] net: Make the loopback device per network namespace

From: Eric W. Biederman <ebiederm@...ssion.com> - unquoted

This patch makes the loopback_dev per network namespace.
The loopback device registers itself as a pernet_device so
we can register the new loopback_dev instance when we add
a new network namespace and so we can unregister the
loopback device when we destory the network namespace.

Currently the loopback device statitics are kept accross
all loopback devices, a minor glitch that will not affect
correct operation but something we may want to fix.

This patch modifies all users the loopback_dev so they
access it as per_net(loopback_dev, init_net()), keeping all of the
code compiling and working.  A later pass will be needed to
update the users to use something other than the initial network
namespace.

The only non-trivial modification was the ipv6 code in route.c as the
loopback_dev can no longer be used in static initializers, and
even that change was very simple.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 drivers/net/loopback.c           |   24 ++++++++++++++++++++----
 include/linux/netdevice.h        |    2 +-
 net/core/dst.c                   |    8 ++++----
 net/decnet/dn_dev.c              |    4 ++--
 net/decnet/dn_route.c            |   14 +++++++-------
 net/ipv4/devinet.c               |    4 ++--
 net/ipv4/ipconfig.c              |    8 +++++---
 net/ipv4/ipvs/ip_vs_core.c       |    2 +-
 net/ipv4/route.c                 |   18 +++++++++---------
 net/ipv4/xfrm4_policy.c          |    2 +-
 net/ipv6/addrconf.c              |    8 ++++----
 net/ipv6/netfilter/ip6t_REJECT.c |    2 +-
 net/ipv6/route.c                 |   24 +++++++++++++++---------
 net/ipv6/xfrm6_policy.c          |    2 +-
 net/xfrm/xfrm_policy.c           |    4 ++--
 15 files changed, 75 insertions(+), 51 deletions(-)

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 22b672d..e9abf3f 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -57,6 +57,7 @@
 #include <linux/ip.h>
 #include <linux/tcp.h>
 #include <linux/percpu.h>
+#include <net/net_namespace.h>
 
 struct pcpu_lstats {
 	unsigned long packets;
@@ -204,7 +205,7 @@ static const struct ethtool_ops loopback_ethtool_ops = {
  * The loopback device is special. There is only one instance and
  * it is statically allocated. Don't do this for other devices.
  */
-struct net_device loopback_dev = {
+DEFINE_PER_NET(struct net_device, loopback_dev) = {
 	.name	 		= "lo",
 	.get_stats		= &get_stats,
 	.priv			= &loopback_stats,
@@ -228,13 +229,28 @@ struct net_device loopback_dev = {
 	.ethtool_ops		= &loopback_ethtool_ops,
 };
 
+static int loopback_net_init(net_t net)
+{
+	per_net(loopback_dev, net).nd_net = net;
+	return register_netdev(&per_net(loopback_dev, net));
+}
+
+static void loopback_net_exit(net_t net)
+{
+	unregister_netdev(&per_net(loopback_dev, net));
+}
+
+static struct pernet_operations loopback_net_ops = {
+	.init = loopback_net_init,
+	.exit = loopback_net_exit,
+};
+
 /* Setup and register the loopback device. */
 static int __init loopback_init(void)
 {
-	loopback_dev.nd_net = init_net();
-	return register_netdev(&loopback_dev);
+	return register_pernet_device(&loopback_net_ops);
 };
 
 module_init(loopback_init);
 
-EXPORT_SYMBOL(loopback_dev);
+EXPORT_PER_NET_SYMBOL(loopback_dev);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9e28671..73931a0 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -570,7 +570,7 @@ struct packet_type {
 #include <linux/interrupt.h>
 #include <linux/notifier.h>
 
-extern struct net_device		loopback_dev;		/* The loopback */
+DECLARE_PER_NET(struct net_device,	loopback_dev);		/* The loopback */
 extern struct net_device		*dev_base;		/* All devices */
 extern rwlock_t				dev_base_lock;		/* Device list lock */
 
diff --git a/net/core/dst.c b/net/core/dst.c
index 8c4a272..3435771 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -241,13 +241,13 @@ static inline void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 		dst->input = dst_discard_in;
 		dst->output = dst_discard_out;
 	} else {
-		dst->dev = &loopback_dev;
-		dev_hold(&loopback_dev);
+		dst->dev = &per_net(loopback_dev, init_net());
+		dev_hold(dst->dev);
 		dev_put(dev);
 		if (dst->neighbour && dst->neighbour->dev == dev) {
-			dst->neighbour->dev = &loopback_dev;
+			dst->neighbour->dev = &per_net(loopback_dev, init_net());
 			dev_put(dev);
-			dev_hold(&loopback_dev);
+			dev_hold(dst->neighbour->dev);
 		}
 	}
 }
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index 19b1469..dbaf001 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -866,10 +866,10 @@ last_chance:
 		rv = dn_dev_get_first(dev, addr);
 		read_unlock(&dev_base_lock);
 		dev_put(dev);
-		if (rv == 0 || dev == &loopback_dev)
+		if (rv == 0 || dev == &per_net(loopback_dev, init_net()))
 			return rv;
 	}
-	dev = &loopback_dev;
+	dev = &per_net(loopback_dev, init_net());
 	dev_hold(dev);
 	goto last_chance;
 }
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 4263cd9..b553cd4 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -887,7 +887,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
 					.scope = RT_SCOPE_UNIVERSE,
 				     } },
 			    .mark = oldflp->mark,
-			    .iif = loopback_dev.ifindex,
+			    .iif = per_net(loopback_dev, init_net()).ifindex,
 			    .oif = oldflp->oif };
 	struct dn_route *rt = NULL;
 	struct net_device *dev_out = NULL;
@@ -904,7 +904,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *old
 		       "dn_route_output_slow: dst=%04x src=%04x mark=%d"
 		       " iif=%d oif=%d\n", dn_ntohs(oldflp->fld_dst),
 		       dn_ntohs(oldflp->fld_src),
-                       oldflp->mark, loopback_dev.ifindex, oldflp->oif);
+                       oldflp->mark, per_net(loopback_dev, init_net()).ifindex, oldflp->oif);
 
 	/* If we have an output interface, verify its a DECnet device */
 	if (oldflp->oif) {
@@ -955,7 +955,7 @@ source_ok:
 		err = -EADDRNOTAVAIL;
 		if (dev_out)
 			dev_put(dev_out);
-		dev_out = &loopback_dev;
+		dev_out = &per_net(loopback_dev, init_net());
 		dev_hold(dev_out);
 		if (!fl.fld_dst) {
 			fl.fld_dst =
@@ -964,7 +964,7 @@ source_ok:
 			if (!fl.fld_dst)
 				goto out;
 		}
-		fl.oif = loopback_dev.ifindex;
+		fl.oif = per_net(loopback_dev, init_net()).ifindex;
 		res.type = RTN_LOCAL;
 		goto make_route;
 	}
@@ -1010,7 +1010,7 @@ source_ok:
 					if (dev_out)
 						dev_put(dev_out);
 					if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
-						dev_out = &loopback_dev;
+						dev_out = &per_net(loopback_dev, init_net());
 						res.type = RTN_LOCAL;
 					} else {
 						dev_out = neigh->dev;
@@ -1031,7 +1031,7 @@ source_ok:
 		/* Possible improvement - check all devices for local addr */
 		if (dn_dev_islocal(dev_out, fl.fld_dst)) {
 			dev_put(dev_out);
-			dev_out = &loopback_dev;
+			dev_out = &per_net(loopback_dev, init_net());
 			dev_hold(dev_out);
 			res.type = RTN_LOCAL;
 			goto select_source;
@@ -1067,7 +1067,7 @@ select_source:
 			fl.fld_src = fl.fld_dst;
 		if (dev_out)
 			dev_put(dev_out);
-		dev_out = &loopback_dev;
+		dev_out = &per_net(loopback_dev, init_net());
 		dev_hold(dev_out);
 		fl.oif = dev_out->ifindex;
 		if (res.fi)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a7d991d..201442c 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1056,7 +1056,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
 	ASSERT_RTNL();
 
 	if (!in_dev) {
-		if (event == NETDEV_REGISTER && dev == &loopback_dev) {
+		if (event == NETDEV_REGISTER && dev == &per_net(loopback_dev, init_net())) {
 			in_dev = inetdev_init(dev);
 			if (!in_dev)
 				panic("devinet: Failed to create loopback\n");
@@ -1074,7 +1074,7 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
 	case NETDEV_UP:
 		if (dev->mtu < 68)
 			break;
-		if (dev == &loopback_dev) {
+		if (dev == &per_net(loopback_dev, init_net())) {
 			struct in_ifaddr *ifa;
 			if ((ifa = inet_alloc_ifa()) != NULL) {
 				ifa->ifa_local =
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 91b5729..ee77938 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -185,16 +185,18 @@ static int __init ic_open_devs(void)
 	struct ic_device *d, **last;
 	struct net_device *dev;
 	unsigned short oflags;
+	struct net_device *lo;
 
 	last = &ic_first_dev;
 	rtnl_lock();
 
 	/* bring loopback device up first */
-	if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
-		printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
+	lo = &per_net(loopback_dev, init_net());
+	if (dev_change_flags(lo, lo->flags | IFF_UP) < 0)
+		printk(KERN_ERR "IP-Config: Failed to open %s\n", lo->name);
 
 	for (dev = dev_base; dev; dev = dev->next) {
-		if (dev == &loopback_dev)
+		if (dev == lo)
 			continue;
 		if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 		    (!(dev->flags & IFF_LOOPBACK) &&
diff --git a/net/ipv4/ipvs/ip_vs_core.c b/net/ipv4/ipvs/ip_vs_core.c
index 3425752..2e1e41f 100644
--- a/net/ipv4/ipvs/ip_vs_core.c
+++ b/net/ipv4/ipvs/ip_vs_core.c
@@ -963,7 +963,7 @@ ip_vs_in(unsigned int hooknum, struct sk_buff **pskb,
 	 *	... don't know why 1st test DOES NOT include 2nd (?)
 	 */
 	if (unlikely(skb->pkt_type != PACKET_HOST
-		     || skb->dev == &loopback_dev || skb->sk)) {
+		     || skb->dev == &per_net(loopback_dev, init_net()) || skb->sk)) {
 		IP_VS_DBG(12, "packet type=%d proto=%d daddr=%d.%d.%d.%d ignored\n",
 			  skb->pkt_type,
 			  skb->nh.iph->protocol,
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 8be7506..d23a0d7 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1498,8 +1498,8 @@ static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 {
 	struct rtable *rt = (struct rtable *) dst;
 	struct in_device *idev = rt->idev;
-	if (dev != &loopback_dev && idev && idev->dev == dev) {
-		struct in_device *loopback_idev = in_dev_get(&loopback_dev);
+	if (dev != &per_net(loopback_dev, init_net()) && idev && idev->dev == dev) {
+		struct in_device *loopback_idev = in_dev_get(&per_net(loopback_dev, init_net()));
 		if (loopback_idev) {
 			rt->idev = loopback_idev;
 			in_dev_put(idev);
@@ -1651,7 +1651,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 #endif
 	rth->rt_iif	=
 	rth->fl.iif	= dev->ifindex;
-	rth->u.dst.dev	= &loopback_dev;
+	rth->u.dst.dev	= &per_net(loopback_dev, init_net());
 	dev_hold(rth->u.dst.dev);
 	rth->idev	= in_dev_get(rth->u.dst.dev);
 	rth->fl.oif	= 0;
@@ -1969,7 +1969,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	if (res.type == RTN_LOCAL) {
 		int result;
 		result = fib_validate_source(saddr, daddr, tos,
-					     loopback_dev.ifindex,
+					     per_net(loopback_dev, init_net()).ifindex,
 					     dev, &spec_dst, &itag);
 		if (result < 0)
 			goto martian_source;
@@ -2036,7 +2036,7 @@ local_input:
 #endif
 	rth->rt_iif	=
 	rth->fl.iif	= dev->ifindex;
-	rth->u.dst.dev	= &loopback_dev;
+	rth->u.dst.dev	= &per_net(loopback_dev, init_net());
 	dev_hold(rth->u.dst.dev);
 	rth->idev	= in_dev_get(rth->u.dst.dev);
 	rth->rt_gateway	= daddr;
@@ -2375,7 +2375,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
 						  RT_SCOPE_UNIVERSE),
 				      } },
 			    .mark = oldflp->mark,
-			    .iif = loopback_dev.ifindex,
+			    .iif = per_net(loopback_dev, init_net()).ifindex,
 			    .oif = oldflp->oif };
 	struct fib_result res;
 	unsigned flags = 0;
@@ -2469,9 +2469,9 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
 			fl.fl4_dst = fl.fl4_src = htonl(INADDR_LOOPBACK);
 		if (dev_out)
 			dev_put(dev_out);
-		dev_out = &loopback_dev;
+		dev_out = &per_net(loopback_dev, init_net());
 		dev_hold(dev_out);
-		fl.oif = loopback_dev.ifindex;
+		fl.oif = per_net(loopback_dev, init_net()).ifindex;
 		res.type = RTN_LOCAL;
 		flags |= RTCF_LOCAL;
 		goto make_route;
@@ -2516,7 +2516,7 @@ static int ip_route_output_slow(struct rtable **rp, const struct flowi *oldflp)
 			fl.fl4_src = fl.fl4_dst;
 		if (dev_out)
 			dev_put(dev_out);
-		dev_out = &loopback_dev;
+		dev_out = &per_net(loopback_dev, init_net());
 		dev_hold(dev_out);
 		fl.oif = dev_out->ifindex;
 		if (res.fi)
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index fb9f69c..39a0ba2 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -289,7 +289,7 @@ static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 
 	xdst = (struct xfrm_dst *)dst;
 	if (xdst->u.rt.idev->dev == dev) {
-		struct in_device *loopback_idev = in_dev_get(&loopback_dev);
+		struct in_device *loopback_idev = in_dev_get(&per_net(loopback_dev, init_net()));
 		BUG_ON(!loopback_idev);
 
 		do {
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 7be542f..c9fa27a 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2365,7 +2365,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
 	ASSERT_RTNL();
 
-	if (dev == &loopback_dev && how == 1)
+	if (dev == &per_net(loopback_dev, init_net()) && how == 1)
 		how = 0;
 
 	rt6_ifdown(dev);
@@ -4074,13 +4074,13 @@ int __init addrconf_init(void)
 	 * device and it being up should be removed.
 	 */
 	rtnl_lock();
-	if (!ipv6_add_dev(&loopback_dev))
+	if (!ipv6_add_dev(&per_net(loopback_dev, init_net())))
 		err = -ENOMEM;
 	rtnl_unlock();
 	if (err)
 		return err;
 
-	ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
+	ip6_null_entry.rt6i_idev = in6_dev_get(&per_net(loopback_dev, init_net()));
 
 	register_netdevice_notifier(&ipv6_dev_notf);
 
@@ -4121,7 +4121,7 @@ void __exit addrconf_cleanup(void)
 			continue;
 		addrconf_ifdown(dev, 1);
 	}
-	addrconf_ifdown(&loopback_dev, 2);
+	addrconf_ifdown(&per_net(loopback_dev, init_net()), 2);
 
 	/*
 	 *	Check hash table.
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 311eae8..a80bbee 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -170,7 +170,7 @@ static inline void
 send_unreach(struct sk_buff *skb_in, unsigned char code, unsigned int hooknum)
 {
 	if (hooknum == NF_IP6_LOCAL_OUT && skb_in->dev == NULL)
-		skb_in->dev = &loopback_dev;
+		skb_in->dev = &per_net(loopback_dev, init_net());
 
 	icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0, NULL);
 }
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8c9fef9..6805c39 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -125,7 +125,7 @@ struct rt6_info ip6_null_entry = {
 		.dst = {
 			.__refcnt	= ATOMIC_INIT(1),
 			.__use		= 1,
-			.dev		= &loopback_dev,
+			.dev		= NULL,
 			.obsolete	= -1,
 			.error		= -ENETUNREACH,
 			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
@@ -151,7 +151,7 @@ struct rt6_info ip6_prohibit_entry = {
 		.dst = {
 			.__refcnt	= ATOMIC_INIT(1),
 			.__use		= 1,
-			.dev		= &loopback_dev,
+			.dev		= NULL,
 			.obsolete	= -1,
 			.error		= -EACCES,
 			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
@@ -171,7 +171,7 @@ struct rt6_info ip6_blk_hole_entry = {
 		.dst = {
 			.__refcnt	= ATOMIC_INIT(1),
 			.__use		= 1,
-			.dev		= &loopback_dev,
+			.dev		= NULL,
 			.obsolete	= -1,
 			.error		= -EINVAL,
 			.metrics	= { [RTAX_HOPLIMIT - 1] = 255, },
@@ -211,8 +211,8 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 	struct rt6_info *rt = (struct rt6_info *)dst;
 	struct inet6_dev *idev = rt->rt6i_idev;
 
-	if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
-		struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
+	if (dev != &per_net(loopback_dev, init_net()) && idev != NULL && idev->dev == dev) {
+		struct inet6_dev *loopback_idev = in6_dev_get(&per_net(loopback_dev, init_net()));
 		if (loopback_idev != NULL) {
 			rt->rt6i_idev = loopback_idev;
 			in6_dev_put(idev);
@@ -1103,12 +1103,12 @@ int ip6_route_add(struct fib6_config *cfg)
 	if ((cfg->fc_flags & RTF_REJECT) ||
 	    (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
 		/* hold loopback dev/idev if we haven't done so. */
-		if (dev != &loopback_dev) {
+		if (dev != &per_net(loopback_dev, init_net())) {
 			if (dev) {
 				dev_put(dev);
 				in6_dev_put(idev);
 			}
-			dev = &loopback_dev;
+			dev = &per_net(loopback_dev, init_net());
 			dev_hold(dev);
 			idev = in6_dev_get(dev);
 			if (!idev) {
@@ -1803,13 +1803,13 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 	if (rt == NULL)
 		return ERR_PTR(-ENOMEM);
 
-	dev_hold(&loopback_dev);
+	dev_hold(&per_net(loopback_dev, init_net()));
 	in6_dev_hold(idev);
 
 	rt->u.dst.flags = DST_HOST;
 	rt->u.dst.input = ip6_input;
 	rt->u.dst.output = ip6_output;
-	rt->rt6i_dev = &loopback_dev;
+	rt->rt6i_dev = &per_net(loopback_dev, init_net());
 	rt->rt6i_idev = idev;
 	rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
 	rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
@@ -2457,6 +2457,12 @@ void __init ip6_route_init(void)
 	ip6_dst_ops.kmem_cachep =
 		kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
 				  SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+	/* Perform the initialization we can't perform at compile time */
+	ip6_null_entry.u.dst.dev = &per_net(loopback_dev, init_net());
+#ifdef CONFIG_IPV6_MULTIPLE_TABLES
+	ip6_prohibit_entry.u.dst.dev = &per_net(loopback_dev, init_net());
+	ip6_blk_hole_entry.u.dst.dev = &per_net(loopback_dev, init_net());
+#endif	
 	fib6_init();
 #ifdef 	CONFIG_PROC_FS
 	p = proc_net_create(init_net(), "ipv6_route", 0, rt6_proc_info);
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 8dffd4d..2608c75 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -354,7 +354,7 @@ static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 
 	xdst = (struct xfrm_dst *)dst;
 	if (xdst->u.rt6.rt6i_idev->dev == dev) {
-		struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
+		struct inet6_dev *loopback_idev = in6_dev_get(&per_net(loopback_dev, init_net()));
 		BUG_ON(!loopback_idev);
 
 		do {
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 0248343..51ab8ac 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1799,8 +1799,8 @@ static int stale_bundle(struct dst_entry *dst)
 void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
 {
 	while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
-		dst->dev = &loopback_dev;
-		dev_hold(&loopback_dev);
+		dst->dev = &per_net(loopback_dev, init_net());
+		dev_hold(dst->dev);
 		dev_put(dev);
 	}
 }
-- 
1.4.4.1.g278f

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