netdev - Re: [PATCH v3 net-next 1/2] tools: psock_lib: tighten conditions checked in sock

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Date:   Wed, 04 Jan 2017 23:26:26 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>
CC:     linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        willemb@...gle.com, davem@...emloft.net, shuah@...nel.org
Subject: Re: [PATCH v3 net-next 1/2] tools: psock_lib: tighten conditions
 checked in sock_setfilter

On 01/04/2017 11:22 PM, Sowmini Varadhan wrote:
> On (01/04/17 23:16), Daniel Borkmann wrote:
>>
>> Just reading up on the thread, sorry to jump in late. Can't you just
>> use the generated code from bpf_asm (tools/net/) and add the asm program
>> as a comment above? Something like we do in net/core/ptp_classifier.c +13.
>
> I was actually using the example from the BSD bpf(4) man page,
> and expanding on that one..
>    https://www.freebsd.org/cgi/man.cgi?query=bpf&sektion=4&manpath=FreeBSD+4.7-RELEASE
> (I could not find the equivalent linux man page).
>
> It was a lot easier to parse than the existing code .

cBPF with its tooling is all documented here:

   Documentation/networking/filter.txt

>> As it stands it makes it a bit harder to parse / less readable with macros
>> actually. Rest seems fine, thanks.
>
> You think the earlier code was readable? I had to use
> gcc -E, with help from the bpf(4) page, to make sense of it.
>
> --Sowmini
>
>