[mirror_ubuntu-bionic-kernel.git] / include / uapi / linux / seg6_iptunnel.h

/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <david.lebrun@uclouvain.be>
 *
 *
 *  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 _UAPI_LINUX_SEG6_IPTUNNEL_H
#define _UAPI_LINUX_SEG6_IPTUNNEL_H

#include <linux/seg6.h>		/* For struct ipv6_sr_hdr. */

enum {
	SEG6_IPTUNNEL_UNSPEC,
	SEG6_IPTUNNEL_SRH,
	__SEG6_IPTUNNEL_MAX,
};
#define SEG6_IPTUNNEL_MAX (__SEG6_IPTUNNEL_MAX - 1)

struct seg6_iptunnel_encap {
	int mode;
	struct ipv6_sr_hdr srh[0];
};

#define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3))

enum {
	SEG6_IPTUN_MODE_INLINE,
	SEG6_IPTUN_MODE_ENCAP,
	SEG6_IPTUN_MODE_L2ENCAP,
};

#ifdef __KERNEL__

static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
{
	int head = 0;

	switch (tuninfo->mode) {
	case SEG6_IPTUN_MODE_INLINE:
		break;
	case SEG6_IPTUN_MODE_ENCAP:
		head = sizeof(struct ipv6hdr);
		break;
	case SEG6_IPTUN_MODE_L2ENCAP:
		return 0;
	}

	return ((tuninfo->srh->hdrlen + 1) << 3) + head;
}

#endif

#endif
Commit	Line	Data
e2be04c7	1	/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
6c8702c6 DL	2	/*
	3	* SR-IPv6 implementation
	4	*
	5	* Author:
	6	* David Lebrun <david.lebrun@uclouvain.be>
	7	*
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*/
	14
	15	#ifndef _UAPI_LINUX_SEG6_IPTUNNEL_H
	16	#define _UAPI_LINUX_SEG6_IPTUNNEL_H
	17
ea3ebc73 DL	18	#include <linux/seg6.h> /* For struct ipv6_sr_hdr. */
ea3ebc73 DL	19
6c8702c6 DL	20	enum {
	21	SEG6_IPTUNNEL_UNSPEC,
	22	SEG6_IPTUNNEL_SRH,
	23	__SEG6_IPTUNNEL_MAX,
	24	};
	25	#define SEG6_IPTUNNEL_MAX (__SEG6_IPTUNNEL_MAX - 1)
	26
	27	struct seg6_iptunnel_encap {
	28	int mode;
	29	struct ipv6_sr_hdr srh[0];
	30	};
	31
	32	#define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3))
	33
	34	enum {
	35	SEG6_IPTUN_MODE_INLINE,
	36	SEG6_IPTUN_MODE_ENCAP,
38ee7f2d	37	SEG6_IPTUN_MODE_L2ENCAP,
6c8702c6 DL	38	};
6c8702c6 DL	39
a50a05f4 DL	40	#ifdef __KERNEL__
a50a05f4 DL	41
6c8702c6 DL	42	static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
6c8702c6 DL	43	{
38ee7f2d DL	44	int head = 0;
	45
	46	switch (tuninfo->mode) {
	47	case SEG6_IPTUN_MODE_INLINE:
	48	break;
	49	case SEG6_IPTUN_MODE_ENCAP:
	50	head = sizeof(struct ipv6hdr);
	51	break;
	52	case SEG6_IPTUN_MODE_L2ENCAP:
	53	return 0;
	54	}
	55
	56	return ((tuninfo->srh->hdrlen + 1) << 3) + head;
6c8702c6 DL	57	}
	58
	59	#endif
a50a05f4 DL	60
a50a05f4 DL	61	#endif