netdev - Re: [PATCH net] vxlan: Pull inner IP header in vxlan_xmit

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Date: Tue, 04 Jun 2024 12:55:53 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Guillaume Nault <gnault@...hat.com>, David Miller <davem@...emloft.net>,
  Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH net] vxlan: Pull inner IP header in vxlan_xmit_one().

On Wed, 2024-05-29 at 21:01 +0200, Guillaume Nault wrote:
> Ensure the inner IP header is part of the skb's linear data before
> setting old_iph. Otherwise, on a fragmented skb, old_iph could point
> outside of the packet data.
> 
> Use skb_vlan_inet_prepare() on classical VXLAN devices to accommodate
> for potential VLANs. Use pskb_inet_may_pull() for VXLAN-GPE as there's
> no Ethernet header in that case.

AFAICS even vxlan-GPE allows an ethernet header, see tun_p_to_eth_p()
and:

https://www.ietf.org/archive/id/draft-ietf-nvo3-vxlan-gpe-12.html#name-multi-protocol-support

What I'm missing?

Thanks,

Paolo