[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>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index b43574f..6d5c3c2 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2410,7 +2410,7 @@
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 @@
* 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 @@
continue;
addrconf_ifdown(dev, 1);
}
- addrconf_ifdown(loopback_dev, 2);
+ addrconf_ifdown(init_net.loopback_dev, 2);
/*
* Check hash table.
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 5086053..3fd08d5 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -167,7 +167,7 @@
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 = init_net.loopback_dev;
icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0, NULL);
}
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a7a21a7..6ff19f9 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -221,8 +221,8 @@
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 @@
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 @@
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));
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index cc07216..15aa4c5 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -375,7 +375,7 @@
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(init_net.loopback_dev);
BUG_ON(!loopback_idev);
do {
