[NET]: Make the loopback device per network namespace.

This patch makes loopback_dev per network namespace.  Adding
code to create a different loopback device for each network
namespace and adding the code to free a loopback device
when a network namespace exits.

This patch modifies all users the loopback_dev so they
access it as init_net.loopback_dev, 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.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 9 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index b43574f73375..6d5c3c299148 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2410,7 +2410,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
         ASSERT_RTNL();
 
-        if (dev == loopback_dev && how == 1)
+        if (dev == init_net.loopback_dev && how == 1)
                 how = 0;
 
         rt6_ifdown(dev);
@@ -4212,19 +4212,19 @@ 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(init_net.loopback_dev))
                 err = -ENOMEM;
         rtnl_unlock();
         if (err)
                 return err;
 
-        ip6_null_entry.u.dst.dev = loopback_dev;
-        ip6_null_entry.rt6i_idev = in6_dev_get(loopback_dev);
+        ip6_null_entry.u.dst.dev = init_net.loopback_dev;
+        ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
-        ip6_prohibit_entry.u.dst.dev = loopback_dev;
-        ip6_prohibit_entry.rt6i_idev = in6_dev_get(loopback_dev);
-        ip6_blk_hole_entry.u.dst.dev = loopback_dev;
-        ip6_blk_hole_entry.rt6i_idev = in6_dev_get(loopback_dev);
+        ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
+        ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
+        ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
+        ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
 #endif
 
         register_netdevice_notifier(&ipv6_dev_notf);
@@ -4279,7 +4279,7 @@ void __exit addrconf_cleanup(void)
                         continue;
                 addrconf_ifdown(dev, 1);
         }
-        addrconf_ifdown(loopback_dev, 2);
+        addrconf_ifdown(init_net.loopback_dev, 2);
 
         /*
          *      Check hash table.