netdev - RE: [PATCH iproute2-next 3/3] f_flower: Introduce L2TPv3 support

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Date:   Mon, 3 Oct 2022 09:19:25 +0000
From:   "Drewek, Wojciech" <wojciech.drewek@...el.com>
To:     David Ahern <dsahern@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "stephen@...workplumber.org" <stephen@...workplumber.org>,
        "gnault@...hat.com" <gnault@...hat.com>
Subject: RE: [PATCH iproute2-next 3/3] f_flower: Introduce L2TPv3 support



> -----Original Message-----
> From: David Ahern <dsahern@...il.com>
> Sent: poniedziałek, 3 października 2022 00:51
> To: Drewek, Wojciech <wojciech.drewek@...el.com>; netdev@...r.kernel.org
> Cc: stephen@...workplumber.org; gnault@...hat.com
> Subject: Re: [PATCH iproute2-next 3/3] f_flower: Introduce L2TPv3 support
> 
> On 9/27/22 1:23 AM, Wojciech Drewek wrote:
> > Add support for matching on L2TPv3 session ID.
> > Session ID can be specified only when ip proto was
> > set to IPPROTO_L2TP.
> >
> > L2TPv3 might be transported over IP or over UDP,
> > this implementation is only about L2TPv3 over IP.
> > IPv6 is also supported, in this case next header
> > is set to IPPROTO_L2TP.
> >
> > Example filter:
> >   # tc filter add dev eth0 ingress prio 1 protocol ip \
> >       flower \
> >         ip_proto l2tp \
> >         l2tpv3_sid 1234 \
> >         skip_sw \
> >       action drop
> >
> > Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
> > ---
> >  man/man8/tc-flower.8 | 11 +++++++++--
> >  tc/f_flower.c        | 45 +++++++++++++++++++++++++++++++++++++++++++-
> >  2 files changed, 53 insertions(+), 3 deletions(-)
> >
> 
> 
> I updated kernel headers to latest net-next tree. (uapi headers are
> synched via a script.) This patch on top of that does not compile, so
> something is missing. Please take a look and re-send.

Ok, the issue is that IPPROTO_L2TP is undeclared and I'm not sure how to resolve this.
I've moved IPPROTO_L2TP to in.h file but while building, system file is included
(/usr/include/netinet/in.h) not the project one (iproute2-next/include/uapi/linux/in.h).
I guess the workaround would be to define it in f_flower.c like this:
#ifndef IPPROTO_L2TP
#define IPPROTO_L2TP 115
#endif
I saw similar solution in case of IPPROTO_MPTCP.

Let me know if it works for you.

Regards,
Wojtek