netdev - Re: [PATCH net-next 2/2] tools: psock_tpacket: verify that packet was received on lo before counting it

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Date:   Wed, 4 Jan 2017 09:44:24 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     linux-kselftest@...r.kernel.org,
        Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Willem de Bruijn <willemb@...gle.com>,
        David Miller <davem@...emloft.net>, shuah@...nel.org
Subject: Re: [PATCH net-next 2/2] tools: psock_tpacket: verify that packet
 was received on lo before counting it

On (01/04/17 09:30), Willem de Bruijn wrote:
> 
> The common and simpler solution to this problem is to open the socket
> with protocol 0 to reject all packets, add the BPF filter and only then bind
> with sll_ifindex set to lo. That way no false positives can arrive.

Yes, I thought of that too (and I've seen that done in one commercial
implementation), but given that tpacket nicely returns the incoming
interface, I figured, why not use the test prog to use this (thus
verifying it, and also showing how to use it)

--Sowmini