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authorPavel Emelyanov <xemul@parallels.com>2013-08-21 14:31:38 +0400
committerDavid S. Miller <davem@davemloft.net>2013-08-21 12:21:45 -0700
commitfb7589a162162223e6bb6422dde3fb1ce07d9a78 (patch)
treef99c3c7c9af2681f57b8b7beb4b859bf9d2bf4f5 /include/uapi/linux/if_tun.h
parent5f1cd200c4e4e1a6bce946aaac40c7a10427f3ed (diff)
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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 <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi/linux/if_tun.h')
-rw-r--r--include/uapi/linux/if_tun.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 1870ee2..c58d023 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -56,6 +56,7 @@
#define TUNGETVNETHDRSZ _IOR('T', 215, int)
#define TUNSETVNETHDRSZ _IOW('T', 216, int)
#define TUNSETQUEUE _IOW('T', 217, int)
+#define TUNSETIFINDEX _IOW('T', 218, unsigned int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001
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