1 /* $NetBSD: if_gre.h,v 1.10 2002/02/24 17:22:20 martin Exp $ */ 2 /* $FreeBSD$ */ 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 #ifdef _KERNEL 45 #include <sys/queue.h> 46 47 struct gre_softc { 48 struct ifnet sc_if; 49 LIST_ENTRY(gre_softc) sc_list; 50 int gre_unit; 51 int gre_flags; 52 struct in_addr g_src; /* source address of gre packets */ 53 struct in_addr g_dst; /* destination address of gre packets */ 54 struct route route; /* routing entry that determines, where a 55 encapsulated packet should go */ 56 u_char g_proto; /* protocol of encapsulator */ 57 58 const struct encaptab *encap; /* encapsulation cookie */ 59 60 int called; /* infinite recursion preventer */ 61 }; 62 63 64 struct gre_h { 65 u_int16_t flags; /* GRE flags */ 66 u_int16_t ptype; /* protocol type of payload typically 67 Ether protocol type*/ 68 /* 69 * from here on: fields are optional, presence indicated by flags 70 * 71 u_int_16 checksum checksum (one-complements of GRE header 72 and payload 73 Present if (ck_pres | rt_pres == 1). 74 Valid if (ck_pres == 1). 75 u_int_16 offset offset from start of routing filed to 76 first octet of active SRE (see below). 77 Present if (ck_pres | rt_pres == 1). 78 Valid if (rt_pres == 1). 79 u_int_32 key inserted by encapsulator e.g. for 80 authentication 81 Present if (key_pres ==1 ). 82 u_int_32 seq_num Sequence number to allow for packet order 83 Present if (seq_pres ==1 ). 84 struct gre_sre[] routing Routing fileds (see below) 85 Present if (rt_pres == 1) 86 */ 87 } __packed; 88 89 struct greip { 90 struct ip gi_i; 91 struct gre_h gi_g; 92 } __packed; 93 94 #define gi_pr gi_i.ip_p 95 #define gi_len gi_i.ip_len 96 #define gi_src gi_i.ip_src 97 #define gi_dst gi_i.ip_dst 98 #define gi_ptype gi_g.ptype 99 #define gi_flags gi_g.flags 100 101 #define GRE_CP 0x8000 /* Checksum Present */ 102 #define GRE_RP 0x4000 /* Routing Present */ 103 #define GRE_KP 0x2000 /* Key Present */ 104 #define GRE_SP 0x1000 /* Sequence Present */ 105 #define GRE_SS 0x0800 /* Strict Source Route */ 106 107 /* 108 * CISCO uses special type for GRE tunnel created as part of WCCP 109 * connection, while in fact those packets are just IPv4 encapsulated 110 * into GRE. 111 */ 112 #define WCCP_PROTOCOL_TYPE 0x883E 113 114 /* 115 * gre_sre defines a Source route Entry. These are needed if packets 116 * should be routed over more than one tunnel hop by hop 117 */ 118 struct gre_sre { 119 u_int16_t sre_family; /* adress family */ 120 u_char sre_offset; /* offset to first octet of active entry */ 121 u_char sre_length; /* number of octets in the SRE. 122 sre_lengthl==0 -> last entry. */ 123 u_char *sre_rtinfo; /* the routing information */ 124 }; 125 126 struct greioctl { 127 int unit; 128 struct in_addr addr; 129 }; 130 131 /* for mobile encaps */ 132 133 struct mobile_h { 134 u_int16_t proto; /* protocol and S-bit */ 135 u_int16_t hcrc; /* header checksum */ 136 u_int32_t odst; /* original destination address */ 137 u_int32_t osrc; /* original source addr, if S-bit set */ 138 } __packed; 139 140 struct mobip_h { 141 struct ip mi; 142 struct mobile_h mh; 143 } __packed; 144 145 146 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 147 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 148 #define MOB_H_SBIT 0x0080 149 150 #define GRE_TTL 30 151 152 #endif /* _KERNEL */ 153 154 /* 155 * ioctls needed to manipulate the interface 156 */ 157 158 #define GRESADDRS _IOW('i', 101, struct ifreq) 159 #define GRESADDRD _IOW('i', 102, struct ifreq) 160 #define GREGADDRS _IOWR('i', 103, struct ifreq) 161 #define GREGADDRD _IOWR('i', 104, struct ifreq) 162 #define GRESPROTO _IOW('i' , 105, struct ifreq) 163 #define GREGPROTO _IOWR('i', 106, struct ifreq) 164 165 #ifdef _KERNEL 166 LIST_HEAD(gre_softc_head, gre_softc); 167 extern struct gre_softc_head gre_softc_list; 168 169 u_short gre_in_cksum(u_short *p, u_int len); 170 #endif /* _KERNEL */ 171 172 #endif 173