netdev - Re: [patch v2, kernel version 3.2.1] net/ipv4/ip

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Date:	Mon, 16 Jan 2012 23:52:25 +0100
From:	Štefan Gula <steweg@...t.sk>
To:	David Lamparter <equinox@...c24.net>
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 v2, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

Dňa 16. januára 2012 21:29, David Lamparter <equinox@...c24.net> napísal/a:
> At the risk of repeating myself, Linux GRE support already has
> provisions for multipoint tunnels. And unlike your code, those reuse the
> existing neighbor table infrastructure, including all of its user
> interface and introspection capabilities.
>
> It's actually slightly visible in your patch:
>
> On Mon, Jan 16, 2012 at 08:45:14PM +0100, Štefan Gula wrote:
>> +++ linux-3.2.1-my/net/ipv4/ip_gre.c  2012-01-16 20:42:03.000000000 +0100
>> @@ -716,7 +942,19 @@ static netdev_tx_t ipgre_tunnel_xmit(str
> [...]
>>               /* NBMA tunnel */
>>
>>               if (skb_dst(skb) == NULL) {
>
>
> -David

That code you are referring to is used only for routed traffic inside
GRE - L3 traffic over L3 routed infrastructure. My patch is dealing
with L2 traffic over L3 routed infrastructure - so the decision here
is based on destination MAC addresses and not based on IPv4/IPv6
addresses.

-- 
Stefan Gula
CCNP, CCIP
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