Re: [patch v2, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet multipoint GRE over IP

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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) {

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