From: Pavel Emelyanov Date: Wed, 21 Aug 2013 10:31:38 +0000 (+0400) Subject: tun: Add ability to create tun device with given index X-Git-Tag: v3.12-rc1~132^2~219^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb7589a162162223e6bb6422dde3fb1ce07d9a78;p=pandora-kernel.git tun: Add ability to create tun device with given index Tun devices cannot be created with ifidex user wants, but it's required by checkpoint-restore project. Long time ago such ability was implemented for rtnl_ops-based interface for creating links (9c7dafbf net: Allow to create links with given ifindex), but the only API for creating and managing tuntap devices is ioctl-based and is evolving with adding new ones (cde8b15f tuntap: add ioctl to attach or detach a file form tuntap device). Following that trend, here's how a new ioctl that sets the ifindex for device, that _will_ be created by TUNSETIFF ioctl looks like. So those who want a tuntap device with the ifindex N, should open the tun device, call ioctl(fd, TUNSETIFINDEX, &N), then call TUNSETIFF. If the index N is busy, then the register_netdev will find this out and the ioctl would be failed with -EBUSY. If setifindex is not called, then it will be generated as before. Signed-off-by: Pavel Emelyanov Signed-off-by: David S. Miller --- Reading git-diff-tree failed