Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752755AbbKPW3G (ORCPT ); Mon, 16 Nov 2015 17:29:06 -0500 Received: from mail-pa0-f41.google.com ([209.85.220.41]:34661 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751905AbbKPW2z (ORCPT ); Mon, 16 Nov 2015 17:28:55 -0500 Message-ID: <1447712932.22599.77.camel@edumazet-glaptop2.roam.corp.google.com> Subject: Re: Routing loops & TTL tracking with tunnel devices From: Eric Dumazet To: "Jason A. Donenfeld" Cc: Sowmini Varadhan , Jiri Benc , therbert@google.com, David Miller , Netdev , LKML Date: Mon, 16 Nov 2015 14:28:52 -0800 In-Reply-To: References: <20151116203709.GA27178@oracle.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 926 Lines: 24 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/