netdev - Re: [PATCH net-next] netfilter: add IPComp extension match support

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Date:	Fri, 6 Dec 2013 17:56:09 +0800
From:	Fan Du <fan.du@...driver.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	<steffen.klassert@...unet.com>, <kaber@...sh.net>,
	<netdev@...r.kernel.org>, <netfilter-devel@...r.kernel.org>
Subject: Re: [PATCH net-next] netfilter: add IPComp extension match support



On 2013年12月06日 02:34, Pablo Neira Ayuso wrote:
> Hi,
>
> On Thu, Nov 28, 2013 at 10:53:24AM +0800, Fan Du wrote:
>> With this plugin, user could specify IPComp tagged with certain
>> CPI that host not interested will be DROPped or any other action.
>>
>> For example:
>> iptables -A INPUT -p 108 -m ipcomp --ipcompspi 0x87 -j DROP
>>
>> Then input IPComp packet with CPI equates 0x87 will not reach
>> upper layer anymore.
>
> I think that, with a little bit more work, you can add support for
> IPv6 as well. From RFC 3173:
>
> "In the IPv6 context, IPComp is viewed as an end-to-end payload, and
> MUST NOT apply to hop-by-hop, routing, and fragmentation extension
> headers.
>
> You can perform that IPv6-specific handling to skip these extension
> headers and reach the IPComp header by means of the ipv6_find_hdr()
> helper function.
>
> BTW, please post the iptables userspace part as well.

Thanks for your attention, Pablo.
I will try to finish your request this weekend, hopefully post the whole
patch set in early next week.

-- 
浮沉随浪只记今朝笑

--fan fan
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