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

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Message-ID: <ZmCKALr0oxmZdW6q@debian>
Date: Wed, 5 Jun 2024 17:53:36 +0200
From: Guillaume Nault <gnault@...hat.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Paolo Abeni <pabeni@...hat.com>, David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net] vxlan: Pull inner IP header in vxlan_xmit_one().

On Wed, Jun 05, 2024 at 03:49:47PM +0200, Eric Dumazet wrote:
> On Wed, Jun 5, 2024 at 3:38 PM Guillaume Nault <gnault@...hat.com> wrote:
> >
> > 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.
> 
> What is a "fragmented skb" ?

I meant "non linear". I'll rephrase in v2.

> > > >
> > > > 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.
> 
> Also please add a Fixes: tag

Yes, I forgot it in the original posting.
I added it as a reply to the patch email.