netdev - Re: [PATCH iproute2-next v2] ip: xfrm: add espintcp encapsulation

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Message-ID: <20200119154401.GA194807@bistromath.localdomain>
Date:   Sun, 19 Jan 2020 16:44:01 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH iproute2-next v2] ip: xfrm: add espintcp encapsulation

2020-01-19, 08:31:32 -0700, David Ahern wrote:
> On 1/19/20 3:32 AM, Sabrina Dubroca wrote:
> > diff --git a/include/uapi/linux/udp.h b/include/uapi/linux/udp.h
> > new file mode 100644
> > index 000000000000..2d1f561b89d2
> > --- /dev/null
> > +++ b/include/uapi/linux/udp.h
> > @@ -0,0 +1,47 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> > +/*
> > + * INET		An implementation of the TCP/IP protocol suite for the LINUX
> > + *		operating system.  INET is implemented using the  BSD Socket
> > + *		interface as the means of communication with the user level.
> > + *
> > + *		Definitions for the UDP protocol.
> > + *
> > + * Version:	@(#)udp.h	1.0.2	04/28/93
> > + *
> > + * Author:	Fred N. van Kempen, <waltje@...lt.NL.Mugnet.ORG>
> > + *
> > + *		This program is free software; you can redistribute it and/or
> > + *		modify it under the terms of the GNU General Public License
> > + *		as published by the Free Software Foundation; either version
> > + *		2 of the License, or (at your option) any later version.
> > + */
> > +#ifndef _UDP_H
> > +#define _UDP_H
> > +
> > +#include <linux/types.h>
> > +
> > +struct udphdr {
> > +	__be16	source;
> > +	__be16	dest;
> > +	__be16	len;
> > +	__sum16	check;
> > +};
> > +
> > +/* UDP socket options */
> > +#define UDP_CORK	1	/* Never send partially complete segments */
> > +#define UDP_ENCAP	100	/* Set the socket to accept encapsulated packets */
> > +#define UDP_NO_CHECK6_TX 101	/* Disable sending checksum for UDP6X */
> > +#define UDP_NO_CHECK6_RX 102	/* Disable accpeting checksum for UDP6 */
> > +#define UDP_SEGMENT	103	/* Set GSO segmentation size */
> > +#define UDP_GRO		104	/* This socket can receive UDP GRO packets */
> > +
> > +/* UDP encapsulation types */
> > +#define UDP_ENCAP_ESPINUDP_NON_IKE	1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
> > +#define UDP_ENCAP_ESPINUDP	2 /* draft-ietf-ipsec-udp-encaps-06 */
> > +#define UDP_ENCAP_L2TPINUDP	3 /* rfc2661 */
> > +#define UDP_ENCAP_GTP0		4 /* GSM TS 09.60 */
> > +#define UDP_ENCAP_GTP1U		5 /* 3GPP TS 29.060 */
> > +#define UDP_ENCAP_RXRPC		6
> > +#define TCP_ENCAP_ESPINTCP	7 /* Yikes, this is really xfrm encap types. */
> > +
> > +#endif /* _UDP_H */
> 
> Hi Sabrina:
> 
> I am confused about this header file. It is not from the kernel's uapi
> directory, so the kernel does not care about the values and where did
> you get the file?

Uh? It's right there:

https://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next.git/tree/include/uapi/linux/udp.h

-- 
Sabrina