[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, 6 insertions, 6 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a7a21a7ba790..6ff19f9eb9ee 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -221,8 +221,8 @@ 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 != init_net.loopback_dev && idev != NULL && idev->dev == dev) {
+                struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
                 if (loopback_idev != NULL) {
                         rt->rt6i_idev = loopback_idev;
                         in6_dev_put(idev);
@@ -1185,12 +1185,12 @@ 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 != init_net.loopback_dev) {
                         if (dev) {
                                 dev_put(dev);
                                 in6_dev_put(idev);
                         }
-                        dev = loopback_dev;
+                        dev = init_net.loopback_dev;
                         dev_hold(dev);
                         idev = in6_dev_get(dev);
                         if (!idev) {
@@ -1894,13 +1894,13 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
         if (rt == NULL)
                 return ERR_PTR(-ENOMEM);
 
-        dev_hold(loopback_dev);
+        dev_hold(init_net.loopback_dev);
         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 = init_net.loopback_dev;
         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));