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