tree 75225ba3c5dacd78179fb66d0756097fd8ccde26
parent 04d0e52a194a9bfdefee3aba1b1c74d2439b56fa
author Richard Palethorpe <rpalethorpe@suse.com> 1589539150 +0100
committer Cyril Hrubis <chrubis@suse.cz> 1589550218 +0200

pty04: Avoid receiving packets from all interfaces

Raw sockets receive all packets from all interfaces as soon as they are
created. They don't need to be bound to one or more interfaces like I thought.

This creates the socket with a NULL packet type which appears to be unused in
the Linux kernel and receives no packets. The protocol is then changed to
ETH_P_ALL when binding to the netdevice we are interested in.

I assume it is impossible for a packet to have zero for its packet type. Most
likely using ETH_P_LOOP would have been OK too, but I suppose that is really
used by some hardware.

This also fixes various other problems that have been observed with this
test. Such as memory allocation failures.

Signed-off-by: Richard Palethorpe <rpalethorpe@suse.com>
Cc: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
Tested-by: Jan Stancek <jstancek@redhat.com>