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/* 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
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