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

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Date:	Mon, 30 Jun 2008 11:44:58 -0700
From:	"Joonwoo Park" <joonwpark81@...il.com>
To:	"Jan Engelhardt" <jengelh@...ozas.de>
Cc:	"Patrick McHardy" <kaber@...sh.net>,
	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] netfilter: fix string extension for case insensitive pattern matching

2008/6/29 Jan Engelhardt <jengelh@...ozas.de>:
>
> On Saturday 2008-06-21 09:54, Joonwoo Park wrote:
>
>>icase of xt_string_info indicates case [in]sensitive matching.
>>netfilter can find cmd.exe, Cmd.exe, cMd.exe and etc easily.
>>
>>Signed-off-by: Joonwoo Park <joonwpark81@...il.com>
>>---
>> include/linux/netfilter/xt_string.h |    1 +
>> net/netfilter/xt_string.c           |    2 +-
>> 2 files changed, 2 insertions(+), 1 deletions(-)
>>
>>diff --git a/include/linux/netfilter/xt_string.h b/include/linux/netfilter/xt_string.h
>>index bb21dd1..dfd347f 100644
>>--- a/include/linux/netfilter/xt_string.h
>>+++ b/include/linux/netfilter/xt_string.h
>>@@ -12,6 +12,7 @@ struct xt_string_info
>>       char      pattern[XT_STRING_MAX_PATTERN_SIZE];
>>       u_int8_t  patlen;
>>       u_int8_t  invert;
>>+      u_int8_t  icase;
>>
>>       /* Used internally by the kernel */
>>       struct ts_config __attribute__((aligned(8))) *config;
>
> Why not just doing it this way?
>
>
> enum {
>        XT_STRING_INVERT = 1 << 0,
>        XT_STRING_ICASE  = 1 << 1,
> };
>
> struct xt_string_info {
>        ...
>        union {
>                uint8_t invert;
>                uint8_t flags;
>        };
>        ...
> };
>
>

Not bad for me,
I think invert might be removed and flags can contain XT_STRING_INVERT as well.
But I guess we should do version checking between user-space and
kernel more strictly whatever.
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