1 /* $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz 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 /* 48 * Version of the WCCP, need to be configured manually since 49 * header for version 2 is the same but IP payload is prepended 50 * with additional 4-bytes field. 51 */ 52 typedef enum { 53 WCCP_V1 = 0, 54 WCCP_V2 55 } wccp_ver_t; 56 57 struct gre_softc { 58 struct ifnet sc_if; 59 LIST_ENTRY(gre_softc) sc_list; 60 int gre_unit; 61 int gre_flags; 62 struct in_addr g_src; /* source address of gre packets */ 63 struct in_addr g_dst; /* destination address of gre packets */ 64 struct route route; /* routing entry that determines, where a 65 encapsulated packet should go */ 66 u_char g_proto; /* protocol of encapsulator */ 67 68 const struct encaptab *encap; /* encapsulation cookie */ 69 70 int called; /* infinite recursion preventer */ 71 72 wccp_ver_t wccp_ver; /* version of the WCCP */ 73 }; 74 75 76 struct gre_h { 77 u_int16_t flags; /* GRE flags */ 78 u_int16_t ptype; /* protocol type of payload typically 79 Ether protocol type*/ 80 /* 81 * from here on: fields are optional, presence indicated by flags 82 * 83 u_int_16 checksum checksum (one-complements of GRE header 84 and payload 85 Present if (ck_pres | rt_pres == 1). 86 Valid if (ck_pres == 1). 87 u_int_16 offset offset from start of routing filed to 88 first octet of active SRE (see below). 89 Present if (ck_pres | rt_pres == 1). 90 Valid if (rt_pres == 1). 91 u_int_32 key inserted by encapsulator e.g. for 92 authentication 93 Present if (key_pres ==1 ). 94 u_int_32 seq_num Sequence number to allow for packet order 95 Present if (seq_pres ==1 ). 96 struct gre_sre[] routing Routing fileds (see below) 97 Present if (rt_pres == 1) 98 */ 99 } __packed; 100 101 struct greip { 102 struct ip gi_i; 103 struct gre_h gi_g; 104 } __packed; 105 106 #define gi_pr gi_i.ip_p 107 #define gi_len gi_i.ip_len 108 #define gi_src gi_i.ip_src 109 #define gi_dst gi_i.ip_dst 110 #define gi_ptype gi_g.ptype 111 #define gi_flags gi_g.flags 112 113 #define GRE_CP 0x8000 /* Checksum Present */ 114 #define GRE_RP 0x4000 /* Routing Present */ 115 #define GRE_KP 0x2000 /* Key Present */ 116 #define GRE_SP 0x1000 /* Sequence Present */ 117 #define GRE_SS 0x0800 /* Strict Source Route */ 118 119 /* 120 * CISCO uses special type for GRE tunnel created as part of WCCP 121 * connection, while in fact those packets are just IPv4 encapsulated 122 * into GRE. 123 */ 124 #define WCCP_PROTOCOL_TYPE 0x883E 125 126 /* 127 * gre_sre defines a Source route Entry. These are needed if packets 128 * should be routed over more than one tunnel hop by hop 129 */ 130 struct gre_sre { 131 u_int16_t sre_family; /* address family */ 132 u_char sre_offset; /* offset to first octet of active entry */ 133 u_char sre_length; /* number of octets in the SRE. 134 sre_lengthl==0 -> last entry. */ 135 u_char *sre_rtinfo; /* the routing information */ 136 }; 137 138 struct greioctl { 139 int unit; 140 struct in_addr addr; 141 }; 142 143 /* for mobile encaps */ 144 145 struct mobile_h { 146 u_int16_t proto; /* protocol and S-bit */ 147 u_int16_t hcrc; /* header checksum */ 148 u_int32_t odst; /* original destination address */ 149 u_int32_t osrc; /* original source addr, if S-bit set */ 150 } __packed; 151 152 struct mobip_h { 153 struct ip mi; 154 struct mobile_h mh; 155 } __packed; 156 157 158 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 159 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 160 #define MOB_H_SBIT 0x0080 161 162 #define GRE_TTL 30 163 164 #endif /* _KERNEL */ 165 166 /* 167 * ioctls needed to manipulate the interface 168 */ 169 170 #define GRESADDRS _IOW('i', 101, struct ifreq) 171 #define GRESADDRD _IOW('i', 102, struct ifreq) 172 #define GREGADDRS _IOWR('i', 103, struct ifreq) 173 #define GREGADDRD _IOWR('i', 104, struct ifreq) 174 #define GRESPROTO _IOW('i' , 105, struct ifreq) 175 #define GREGPROTO _IOWR('i', 106, struct ifreq) 176 177 #ifdef _KERNEL 178 LIST_HEAD(gre_softc_head, gre_softc); 179 extern struct mtx gre_mtx; 180 extern struct gre_softc_head gre_softc_list; 181 182 u_int16_t gre_in_cksum(u_int16_t *, u_int); 183 #endif /* _KERNEL */ 184 185 #endif 186