[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>

2 files changed, 9 insertions, 9 deletions

diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index bcaf4c5aa68e..26130afd8029 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -869,10 +869,10 @@ 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 == init_net.loopback_dev)
                         return rv;
         }
-        dev = loopback_dev;
+        dev = init_net.loopback_dev;
         dev_hold(dev);
         goto last_chance;
 }
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 96fe0aa1638e..b7ebf9947ebd 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 = init_net.loopback_dev->ifindex,
                             .oif = oldflp->oif };
         struct dn_route *rt = NULL;
         struct net_device *dev_out = NULL, *dev;
@@ -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, init_net.loopback_dev->ifindex, oldflp->oif);
 
         /* If we have an output interface, verify its a DECnet device */
         if (oldflp->oif) {
@@ -957,7 +957,7 @@ source_ok:
                 err = -EADDRNOTAVAIL;
                 if (dev_out)
                         dev_put(dev_out);
-                dev_out = loopback_dev;
+                dev_out = init_net.loopback_dev;
                 dev_hold(dev_out);
                 if (!fl.fld_dst) {
                         fl.fld_dst =
@@ -966,7 +966,7 @@ source_ok:
                         if (!fl.fld_dst)
                                 goto out;
                 }
-                fl.oif = loopback_dev->ifindex;
+                fl.oif = init_net.loopback_dev->ifindex;
                 res.type = RTN_LOCAL;
                 goto make_route;
         }
@@ -1012,7 +1012,7 @@ source_ok:
                                         if (dev_out)
                                                 dev_put(dev_out);
                                         if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
-                                                dev_out = loopback_dev;
+                                                dev_out = init_net.loopback_dev;
                                                 res.type = RTN_LOCAL;
                                         } else {
                                                 dev_out = neigh->dev;
@@ -1033,7 +1033,7 @@ 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 = init_net.loopback_dev;
                         dev_hold(dev_out);
                         res.type = RTN_LOCAL;
                         goto select_source;
@@ -1069,7 +1069,7 @@ select_source:
                         fl.fld_src = fl.fld_dst;
                 if (dev_out)
                         dev_put(dev_out);
-                dev_out = loopback_dev;
+                dev_out = init_net.loopback_dev;
                 dev_hold(dev_out);
                 fl.oif = dev_out->ifindex;
                 if (res.fi)