if_gre.h revision 103026
1/* $NetBSD: if_gre.h,v 1.10 2002/02/24 17:22:20 martin Exp $ */ 2/* $FreeBSD: head/sys/net/if_gre.h 103026 2002-09-06 17:12:50Z sobomax $ */ 3 4/* 5 * Copyright (c) 1998 The NetBSD Foundation, Inc. 6 * All rights reserved 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Heiko W.Rupp <hwr@pilhuhn.de> 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40#ifndef _NET_IF_GRE_H 41#define _NET_IF_GRE_H 42 43#include <sys/ioccom.h> 44#include <sys/queue.h> 45 46struct gre_softc { 47 struct ifnet sc_if; 48 LIST_ENTRY(gre_softc) sc_list; 49 int gre_unit; 50 int gre_flags; 51 struct in_addr g_src; /* source address of gre packets */ 52 struct in_addr g_dst; /* destination address of gre packets */ 53 struct route route; /* routing entry that determines, where a 54 encapsulated packet should go */ 55 u_char g_proto; /* protocol of encapsulator */ 56 57 const struct encaptab *encap; /* encapsulation cookie */ 58 59 int called; /* infinite recursion preventer */ 60}; 61 62 63struct gre_h { 64 u_int16_t flags; /* GRE flags */ 65 u_int16_t ptype; /* protocol type of payload typically 66 Ether protocol type*/ 67/* 68 * from here on: fields are optional, presence indicated by flags 69 * 70 u_int_16 checksum checksum (one-complements of GRE header 71 and payload 72 Present if (ck_pres | rt_pres == 1). 73 Valid if (ck_pres == 1). 74 u_int_16 offset offset from start of routing filed to 75 first octet of active SRE (see below). 76 Present if (ck_pres | rt_pres == 1). 77 Valid if (rt_pres == 1). 78 u_int_32 key inserted by encapsulator e.g. for 79 authentication 80 Present if (key_pres ==1 ). 81 u_int_32 seq_num Sequence number to allow for packet order 82 Present if (seq_pres ==1 ). 83 struct gre_sre[] routing Routing fileds (see below) 84 Present if (rt_pres == 1) 85 */ 86} __attribute__((__packed__)); 87 88struct greip { 89 struct ip gi_i; 90 struct gre_h gi_g; 91} __attribute__((__packed__)); 92 93#define gi_pr gi_i.ip_p 94#define gi_len gi_i.ip_len 95#define gi_src gi_i.ip_src 96#define gi_dst gi_i.ip_dst 97#define gi_ptype gi_g.ptype 98#define gi_flags gi_g.flags 99 100#define GRE_CP 0x8000 /* Checksum Present */ 101#define GRE_RP 0x4000 /* Routing Present */ 102#define GRE_KP 0x2000 /* Key Present */ 103#define GRE_SP 0x1000 /* Sequence Present */ 104#define GRE_SS 0x0800 /* Strict Source Route */ 105 106/* 107 * gre_sre defines a Source route Entry. These are needed if packets 108 * should be routed over more than one tunnel hop by hop 109 */ 110struct gre_sre { 111 u_int16_t sre_family; /* adress family */ 112 u_char sre_offset; /* offset to first octet of active entry */ 113 u_char sre_length; /* number of octets in the SRE. 114 sre_lengthl==0 -> last entry. */ 115 u_char *sre_rtinfo; /* the routing information */ 116}; 117 118struct greioctl { 119 int unit; 120 struct in_addr addr; 121}; 122 123/* for mobile encaps */ 124 125struct mobile_h { 126 u_int16_t proto; /* protocol and S-bit */ 127 u_int16_t hcrc; /* header checksum */ 128 u_int32_t odst; /* original destination address */ 129 u_int32_t osrc; /* original source addr, if S-bit set */ 130} __attribute__((__packed__)); 131 132struct mobip_h { 133 struct ip mi; 134 struct mobile_h mh; 135} __attribute__((__packed__)); 136 137 138#define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 139#define MOB_H_SIZ_L (sizeof(struct mobile_h)) 140#define MOB_H_SBIT 0x0080 141 142#define GRE_TTL 30 143extern int ip_gre_ttl; 144 145/* 146 * ioctls needed to manipulate the interface 147 */ 148 149#define GRESADDRS _IOW('i', 101, struct ifreq) 150#define GRESADDRD _IOW('i', 102, struct ifreq) 151#define GREGADDRS _IOWR('i', 103, struct ifreq) 152#define GREGADDRD _IOWR('i', 104, struct ifreq) 153#define GRESPROTO _IOW('i' , 105, struct ifreq) 154#define GREGPROTO _IOWR('i', 106, struct ifreq) 155 156#ifdef _KERNEL 157LIST_HEAD(gre_softc_head, gre_softc); 158extern struct gre_softc_head gre_softc_list; 159 160int gre_ioctl __P((struct ifnet *, u_long, caddr_t)); 161int gre_output __P((struct ifnet *, struct mbuf *, struct sockaddr *, 162 struct rtentry *rt)); 163u_short gre_in_cksum(u_short *p, u_int len); 164#endif /* _KERNEL */ 165 166#endif 167