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Message-Id: <20170105.150430.839990438445567255.davem@davemloft.net>
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.
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