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

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Message-ID: <b7f74a02-ff87-1cd5-c3cb-7b620bd11fe2@gmail.com>
Date:   Sun, 19 Jan 2020 08:31:32 -0700
From:   David Ahern <dsahern@...il.com>
To:     Sabrina Dubroca <sd@...asysnail.net>, netdev@...r.kernel.org
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH iproute2-next v2] ip: xfrm: add espintcp encapsulation

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?