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SubjectRe: [patch v4, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet multipoint GRE over IP
2012/1/25 Stephen Hemminger <shemminger@vyatta.com>:
> On Wed, 18 Jan 2012 00:33:14 +0100 (CET)
> Stefan Gula <steweg@ynet.sk> wrote:
>
>> From: Stefan Gula <steweg@gmail.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@gmail.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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