From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: linux-kselftest@vger.kernel.org,
Network Development <netdev@vger.kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Willem de Bruijn <willemb@google.com>,
David Miller <davem@davemloft.net>,
shuah@kernel.org
Subject: Re: [PATCH net-next 2/2] tools: psock_tpacket: verify that packet was received on lo before counting it
Date: Wed, 4 Jan 2017 09:44:24 -0500 [thread overview]
Message-ID: <20170104144424.GD9641@oracle.com> (raw)
In-Reply-To: <CAF=yD-+d-cgE1dxCcrfNZfgVk4_wjYMHHoQ=BN7bnJ-txbM-+Q@mail.gmail.com>
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
next prev parent reply other threads:[~2017-01-04 14:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-03 23:27 [PATCH net-next 0/2] tools: psock_tpacket bug fixes Sowmini Varadhan
2017-01-03 23:27 ` [PATCH net-next 1/2] tools: psock_lib: tighten conditions checked in sock_setfilter Sowmini Varadhan
2017-01-04 14:27 ` Willem de Bruijn
2017-01-03 23:27 ` [PATCH net-next 2/2] tools: psock_tpacket: verify that packet was received on lo before counting it Sowmini Varadhan
2017-01-04 14:30 ` Willem de Bruijn
2017-01-04 14:44 ` Sowmini Varadhan [this message]
2017-01-04 15:03 ` Willem de Bruijn
2017-01-04 15:13 ` Sowmini Varadhan
2017-01-04 16:07 ` Willem de Bruijn
2017-01-04 16:12 ` Sowmini Varadhan
2017-01-04 16:24 ` Willem de Bruijn
2017-01-04 16:27 ` Sowmini Varadhan
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