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

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Date:   Thu, 05 Jan 2017 15:04:30 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     sowmini.varadhan@...cle.com
Cc:     netdev@...r.kernel.org, daniel@...earbox.net, willemb@...gle.com
Subject: Re: [PATCH v4 net-next] tools: psock_tpacket: block Rx until
 socket filter has been added and socket has been bound to loopback.

From: Sowmini Varadhan <sowmini.varadhan@...cle.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@...cle.com>

Applied, thanks.