netdev - Re: [PATCH net-next,v3 04/12] gtp: add IPv6 support

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Message-ID: <20240509121527.GN1736038@kernel.org>
Date: Thu, 9 May 2024 13:15:27 +0100
From: Simon Horman <horms@...nel.org>
To: Pablo Neira Ayuso <pablo@...filter.org>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, laforge@...ocom.org,
	pespin@...mocom.de, osmith@...mocom.de
Subject: Re: [PATCH net-next,v3 04/12] gtp: add IPv6 support

On Tue, May 07, 2024 at 01:52:43AM +0200, Pablo Neira Ayuso wrote:
> Add new iflink attributes to configure in-kernel UDP listener socket
> address: IFLA_GTP_LOCAL and IFLA_GTP_LOCAL6. If none of these attributes
> are specified, default is still to IPv4 INADDR_ANY for backward
> compatibility.
> 
> Add new attributes to set up family and IPv6 address of GTP tunnels:
> GTPA_FAMILY, GTPA_PEER_ADDR6 and GTPA_MS_ADDR6. If no GTPA_FAMILY is
> specified, AF_INET is assumed for backward compatibility.
> 
> setsockopt IPV6_ADDRFORM allows to downgrade socket from IPv6 to IPv4
> after socket is bound. Assumption is that socket listener that is
> attached to the gtp device needs to be either IPv4 or IPv6. Therefore,
> GTP socket listener does not allow for IPv4-mapped-IPv6 listener.
> 
> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>

Reviewed-by: Simon Horman <horms@...nel.org>