Re: Routing loops & TTL tracking with tunnel devices

From: Eric Dumazet
Date: Mon Nov 16 2015 - 17:29:08 EST

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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