Re: [PATCH v4 net-next] tools: psock_tpacket: block Rx until socket filter has been added and socket has been bound to loopback.

[David Miller <davem@davemloft.net>]

From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Date: Thu,  5 Jan 2017 11:06:22 -0800

> Packets from any/all interfaces may be queued up on the PF_PACKET socket
> before it is bound to the loopback interface by psock_tpacket, and
> when these are passed up by the kernel, they could interfere
> with the Rx tests.
> 
> Avoid interference from spurious packet by blocking Rx until the
> socket filter has been set up, and the packet has been bound to the
> desired (lo) interface. The effective sequence is
> 	socket(PF_PACKET, SOCK_RAW, 0);
> 	set up ring
> 	Invoke SO_ATTACH_FILTER
> 	bind to sll_protocol set to ETH_P_ALL, sll_ifindex for lo
> After this sequence, the only packets that will be passed up are
> those received on loopback that pass the attached filter.
> 
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>

Applied, thanks.