/* 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