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

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Message-ID: <ZmBqNPGtUA22yFQE@debian>
Date: Wed, 5 Jun 2024 15:37:56 +0200
From: Guillaume Nault <gnault@...hat.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] vxlan: Pull inner IP header in vxlan_xmit_one().

On Tue, Jun 04, 2024 at 12:55:53PM +0200, Paolo Abeni wrote:
> 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?

Didn't see that. I'll post a v2.
Thanks.

> Thanks,
> 
> Paolo
>