netdev - Re: [PATCH 6/8 v2] netfilter: fix string extension for case insensitive pattern matching

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Date:	Fri, 27 Jun 2008 02:49:34 -0700
From:	"Joonwoo Park" <joonwpark81@...il.com>
To:	"Patrick McHardy" <kaber@...sh.net>
Cc:	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	"Thomas Graf" <tgraf@...g.ch>,
	"Pablo Neira Ayuso" <pablo@...filter.org>
Subject: Re: [PATCH 6/8 v2] netfilter: fix string extension for case insensitive pattern matching

2008/6/26 Patrick McHardy <kaber@...sh.net>:
> Joonwoo Park wrote:
>>
>> netfilter: fix string extension for case insensitive pattern matching
>>
>> The flag XT_STRING_FLAG_IGNORECASE indicates case insensitive string
>> matching.
>> netfilter can find cmd.exe, Cmd.exe, cMd.exe and etc easily.
>>
>> Also this patch won't break compatibility since we have 2 bytes space
>> between invert and config, due to config was 8 bytes aligned.
>> So we can put a new value 'flags' in xt_string_info between invert and
>> config safely.
>> If previous version of iptables interact with this kernel, to kernel
>> side, flags will be set to zero and to user side, flags will be ignored.
>
> This makes it hard for userspace to know whether insensitive
> search is supported or not, similar for possible future flag
> additions.
>
> Please
>
> - add a new revision for userspace to know whether flags are
>  supported at all. You don't need to duplicate the checkentry
>  function for this since the structure layout didn't change,
>  you can simply parse flags dependant on match->revision.
>  Userspace can use the existance of the new revision as
>  indication that flags are supported.
>
> - check for unknown flags and return an error
>

Hi Patrick,
Thanks for your advice.
Since I'm traveling America, so maybe I could catch up these things
you've asked next weekend.
I don't need to rush, do I?

Thanks again,
Joonwoo
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