can-raw: add msg_flags to distinguish local traffic
authorOliver Hartkopp <socketcan@hartkopp.net>
Tue, 19 Oct 2010 09:32:04 +0000 (09:32 +0000)
committerDavid S. Miller <davem@davemloft.net>
Thu, 21 Oct 2010 11:27:03 +0000 (04:27 -0700)
commit1e55659ce6ddb5247cee0b1f720d77a799902b85
tree335e43324d5ad5e0979fb30e333cb1a4e1a47085
parent32a875adcdcf5f470bf967250cfd01722e23844f
can-raw: add msg_flags to distinguish local traffic

CAN has no addressing scheme. It is currently impossible for userspace
to tell is a received CAN frame comes from another process on the local
host, or from a remote CAN device.

This patch add support for userspace applications to distinguish between
'own', 'local' and 'remote' CAN traffic. The distinction is made by returning
flags in msg->msg_flags in the call to recvmsg().

The added documentation explains the introduced flags.

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Documentation/networking/can.txt
net/can/raw.c