linux-kernel - Re: Routing loops & TTL tracking with tunnel devices

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Message-ID: <1447712932.22599.77.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 16 Nov 2015 14:28:52 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Jason A. Donenfeld" <Jason@...c4.com>
Cc:	Sowmini Varadhan <sowmini.varadhan@...cle.com>,
	Jiri Benc <jbenc@...hat.com>, therbert@...gle.com,
	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Routing loops & TTL tracking with tunnel devices

On Mon, 2015-11-16 at 21:55 +0100, Jason A. Donenfeld wrote:
> Hi Sowmini,
> 
> Neat. Though, in my case, I'm not actually just prepending a header.
> I'm doing some more substantial transformations of a packet. And this
> needs to work with v4 too. So I'm not sure implementing a v6 spec will
> help with things. I need to identify the right mechanism inside the
> kernel to assist with this, like, say, a member in sk_buff.

There is very little chance we'll accept a new member in sk_buff, unless
proven needed.

Yes, it is very tempting and dozen of programmers already tried.

You'll have to demonstrate full understanding of the stack and why other
solutions do not work.



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