linux-kernel - Re: tcp/ip connect on demand

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Message-ID: <486D1A66.6010006@zytor.com>
Date:	Thu, 03 Jul 2008 11:28:54 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jens-Michael Hoffmann <J.Hoffmann@...ion.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: tcp/ip connect on demand

Jens-Michael Hoffmann wrote:
> hi,
> 
> what is the right way to implement a "connect on demand" feature?
> Example: user types url in firefox and presses return. Then
> the system should set up network devices and proceed as usual.
> 
> Is there a hook in the kernel we can use?

In the kernel, no.  Nor do you need one; the best place to hook into 
this is probably the name service system (so you catch it on trying to 
look up hostnames.)

Alternatively, you can set up a bridge device which you can listen to 
via a tap device; when you see traffic, you bring up the real network 
and attach it to the bridge.

	-hpa
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