tree 4db94de98ef8e75d5038f6a889dd434f3747c9d3
parent ad72c347e56bf3a0231b9d686e17764157d2961c
author Michael S. Tsirkin <mst@redhat.com> 1263449829 +0000
committer David S. Miller <davem@davemloft.net> 1263548608 -0800

tun: export underlying socket

Tun device looks similar to a packet socket
in that both pass complete frames from/to userspace.

This patch fills in enough fields in the socket underlying tun driver
to support sendmsg/recvmsg operations, and message flags
MSG_TRUNC and MSG_DONTWAIT, and exports access to this socket
to modules.  Regular read/write behaviour is unchanged.

This way, code using raw sockets to inject packets
into a physical device, can support injecting
packets into host network stack almost without modification.

First user of this interface will be vhost virtualization
accelerator.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>