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/* $OpenBSD: if_gre.h,v 1.16 2021/03/10 10:21:48 jsg Exp $ */
/* $NetBSD: if_gre.h,v 1.5 1999/11/19 20:41:19 thorpej Exp $ */
/*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved
*
* This code is derived from software contributed to The NetBSD Foundation
* by Heiko W.Rupp <hwr@pilhuhn.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _NET_IF_GRE_H
#define _NET_IF_GRE_H
struct gre_h {
u_int16_t flags; /* GRE flags */
u_int16_t ptype; /* protocol type of payload typically
Ether protocol type*/
/*
* from here on: fields are optional, presence indicated by flags
*
u_int_16 checksum checksum (one-complements of GRE header
and payload
Present if (ck_pres | rt_pres == 1).
Valid if (ck_pres == 1).
u_int_16 offset offset from start of routing filed to
first octet of active SRE (see below).
Present if (ck_pres | rt_pres == 1).
Valid if (rt_pres == 1).
u_int_32 key inserted by encapsulator e.g. for
authentication
Present if (key_pres ==1 ).
u_int_32 seq_num Sequence number to allow for packet order
Present if (seq_pres ==1 ).
struct gre_sre[] routing Routing fields (see below)
Present if (rt_pres == 1)
*/
} __packed;
struct greip {
struct ip gi_i;
struct gre_h gi_g;
} __packed;
#define gi_pr gi_i.ip_p
#define gi_len gi_i.ip_len
#define gi_src gi_i.ip_src
#define gi_dst gi_i.ip_dst
#define gi_ptype gi_g.ptype
#define gi_flags gi_g.flags
#define GRE_CP 0x8000 /* Checksum Present */
#define GRE_RP 0x4000 /* Routing Present */
#define GRE_KP 0x2000 /* Key Present */
#define GRE_SP 0x1000 /* Sequence Present */
#define GRE_SS 0x0800 /* Strict Source Route */
/* gre_sre defines a Source route Entry. These are needed if packets
* should be routed over more than one tunnel hop by hop
*/
struct gre_sre {
u_int16_t sre_family; /* address family */
u_char sre_offset; /* offset to first octet of active entry */
u_char sre_length; /* number of octets in the SRE.
sre_lengthl==0 -> last entry. */
u_char *sre_rtinfo; /* the routing information */
};
struct greioctl {
int unit;
struct in_addr addr;
};
/* for mobile encaps */
struct mobile_h {
u_int16_t proto; /* protocol and S-bit */
u_int16_t hcrc; /* header checksum */
u_int32_t odst; /* original destination address */
u_int32_t osrc; /* original source addr, if S-bit set */
} __packed;
struct mobip_h {
struct ip mi;
struct mobile_h mh;
} __packed;
#define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
#define MOB_H_SIZ_L (sizeof(struct mobile_h))
#define MOB_H_SBIT 0x0080
#ifdef _KERNEL
int gre_sysctl(int *, u_int, void *, size_t *, void *, size_t);
int gre_input(struct mbuf **, int *, int, int);
int gre_input6(struct mbuf **, int *, int, int);
#endif
#endif /* _NET_IF_GRE_H_ */
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