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net: Allow to create links with given ifindex

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Currently the RTM_NEWLINK results in -EOPNOTSUPP if the ifinfomsg->ifi_index
is not zero. I propose to allow requesting ifindices on link creation. This
is required by the checkpoint-restore to correctly restore a net namespace
(i.e. -- a container).

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov
2012-08-08 21:52:46 +00:00
committed by David S. Miller
parent b14f243a42
commit 9c7dafbfab
2 changed files with 13 additions and 6 deletions
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7
net/core/dev.c
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@@ -5579,7 +5579,12 @@ int register_netdevice(struct net_device *dev)
}
}
dev->ifindex = dev_new_index(net);
ret = -EBUSY;
if (!dev->ifindex)
dev->ifindex = dev_new_index(net);
else if (__dev_get_by_index(net, dev->ifindex))
goto err_uninit;
if (dev->iflink == -1)
dev->iflink = dev->ifindex;