linux-kernel - Re: [patch v4, kernel version 3.2.1] net/ipv4/ip

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Date:	Wed, 25 Jan 2012 22:01:08 +0100
From:	Štefan Gula <steweg@...t.sk>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"David S. Miller" <davem@...emloft.net>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v4, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

2012/1/25 Stephen Hemminger <shemminger@...tta.com>:
> On Wed, 18 Jan 2012 00:33:14 +0100 (CET)
> Stefan Gula <steweg@...t.sk> wrote:
>
>> From: Stefan Gula <steweg@...il.com>
>>
>> This patch is an extension for current Ethernet over GRE
>> implementation, which allows user to create virtual bridge (multipoint
>> VPN) and forward traffic based on Ethernet MAC address information in
>> it. It simulates the Bridge behavior learning mechanism, but instead
>> of learning port ID from which given MAC address comes, it learns IP
>> address of peer which encapsulated given packet. Multicast, Broadcast
>> and unknown-multicast traffic is send over network as multicast
>> encapsulated GRE packet, so one Ethernet multipoint GRE tunnel can be
>> represented as one single virtual switch on logical level and be also
>> represented as one multicast IPv4 address on network level.
>>
>> Signed-off-by: Stefan Gula <steweg@...il.com>
>
> Will this break normal usages of GRE?
> Compile time options are not acceptable for a standard distribution if
> it will break it for the other case. It is fine to add the additional data
> structure elements, but the code in the receive path might get broken?
>
>
No, if you don't decide to compile with given kernel option.. nothing
happens and original GRE code is leaved intact.
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