netdev - Re: [PATCH net] ip_tunnel: allow to inherit from VLAN encapsulated IP frames

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Date:   Tue, 5 Jul 2022 18:25:12 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Matthias May <matthias.may@...termo.com>
Cc:     <netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: Re: [PATCH net] ip_tunnel: allow to inherit from VLAN encapsulated
 IP frames

Please make sure to CC folks pointed out by scripts/get_maintainer.pl

On Tue, 5 Jul 2022 16:54:42 +0200 Matthias May wrote:
> Subject: [PATCH net] ip_tunnel: allow to inherit from VLAN encapsulated IP frames

net-next may be more appropriate, since this never worked.
Unless it did, in which case we need a Fixes tag.

> The current code allows to inherit the TOS, TTL, DF from the payload
> when skb->protocol is ETH_P_IP or ETH_P_IPV6.
> However when the payload is VLAN encapsulated (e.g because the tunnel
> is of type GRETAP), then this inheriting does not work, because the
> visible skb->protocol is of type ETH_P_8021Q.
> 
> Add a check on ETH_P_8021Q and subsequently check the payload protocol.

Do we need to check for 8021AD as well?

> Signed-off-by: Matthias May <matthias.may@...termo.com>
> ---
>  net/ipv4/ip_tunnel.c | 21 +++++++++++++--------

Does ipv6 need the same treatment?