netdev - Re: [PATCH 7/7] netfilter: add user-space connection tracking helper infrastructure

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Date:	Wed, 06 Jun 2012 11:39:26 +0200
From:	Ferenc Wagner <wferi@...f.hu>
To:	pablo@...filter.org
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	wferi@...f.hu
Subject: Re: [PATCH 7/7] netfilter: add user-space connection tracking helper infrastructure

pablo@...filter.org writes:

> * Security: Avoid complex string matching and mangling in kernel-space
>   running in unprivileged mode.

Or rather in privileged mode?

> 2) Add rules to enable the FTP user-space helper which is
>    used to track traffic going to TCP port 10000.

The examples use port 21 in the iptables commands and the expectations:

>  iptables -I OUTPUT -t raw -p tcp --dport 21 -j CT --helper ftp
>  iptables -I PREROUTING -t raw -p tcp --dport 21 -j CT --helper ftp
>
>     [NEW] 301 proto=6 src=192.168.1.136 dst=130.89.148.12 sport=0 dport=54037 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.1.136 master-dst=130.89.148.12 sport=57127 dport=21 class=0 helper=ftp
> [DESTROY] 301 proto=6 src=192.168.1.136 dst=130.89.148.12 sport=0 dport=54037 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.1.136 master-dst=130.89.148.12 sport=57127 dport=21 class=0 helper=ftp
-- 
Regards,
Feri.
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