netdev - Re: [PATCH RFC 3/7] netfilter: add NF_INET_LOCAL_SOCKET

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Message-ID: <560BA345.40504@zonque.org>
Date:	Wed, 30 Sep 2015 10:54:29 +0200
From:	Daniel Mack <daniel@...que.org>
To:	Jan Engelhardt <jengelh@...i.de>
Cc:	Florian Westphal <fw@...len.de>, pablo@...filter.org,
	daniel@...earbox.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, balazs.scheidler@...abit.com
Subject: Re: [PATCH RFC 3/7] netfilter: add NF_INET_LOCAL_SOCKET_IN chain type

On 09/30/2015 09:40 AM, Jan Engelhardt wrote:
> 
> On Wednesday 2015-09-30 09:24, Daniel Mack wrote:
>>
>>> Drop?  Makes no sense, else application would not be running in the first
>>> place.
>>
>> Of course you can drop certain packets at this point, depending on other
>> details. Say, for instance, you want to match all packets that are
>> received by a certain task [...]
>> Another use case is accounting. If you want to know how much traffic a
>> certain service or application in your system has caused
> 
> But the sk info would be available in INPUT already, would it not?

No, only for established connections, as those are subject to early
demux which sets skb->sk. For all other packets, netfilter callbacks are
called with skb->sk == NULL.

That's the whole point of this patch set ;)


Daniel

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