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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _NET_IF_GRE_H 34 #define _NET_IF_GRE_H 35 36 #include <sys/ioccom.h> 37 #ifdef _KERNEL 38 #include <sys/queue.h> 39 40 /* 41 * Version of the WCCP, need to be configured manually since 42 * header for version 2 is the same but IP payload is prepended 43 * with additional 4-bytes field. 44 */ 45 typedef enum { 46 WCCP_V1 = 0, 47 WCCP_V2 48 } wccp_ver_t; 49 50 struct gre_softc { 51 struct ifnet *sc_ifp; 52 LIST_ENTRY(gre_softc) sc_list; 53 int gre_unit; 54 int gre_flags; 55 u_int gre_fibnum; /* use this fib for envelopes */ 56 struct in_addr g_src; /* source address of gre packets */ 57 struct in_addr g_dst; /* destination address of gre packets */ 58 struct route route; /* routing entry that determines, where a 59 encapsulated packet should go */ 60 u_char g_proto; /* protocol of encapsulator */ 61 62 const struct encaptab *encap; /* encapsulation cookie */ 63 64 int called; /* infinite recursion preventer */ 65 66 uint32_t key; /* key included in outgoing GRE packets */ 67 /* zero means none */ 68 69 wccp_ver_t wccp_ver; /* version of the WCCP */ 70 }; 71 #define GRE2IFP(sc) ((sc)->sc_ifp) 72 73 74 struct gre_h { 75 u_int16_t flags; /* GRE flags */ 76 u_int16_t ptype; /* protocol type of payload typically 77 Ether protocol type*/ 78 uint32_t options[0]; /* optional options */ 79 /* 80 * from here on: fields are optional, presence indicated by flags 81 * 82 u_int_16 checksum checksum (one-complements of GRE header 83 and payload 84 Present if (ck_pres | rt_pres == 1). 85 Valid if (ck_pres == 1). 86 u_int_16 offset offset from start of routing filed to 87 first octet of active SRE (see below). 88 Present if (ck_pres | rt_pres == 1). 89 Valid if (rt_pres == 1). 90 u_int_32 key inserted by encapsulator e.g. for 91 authentication 92 Present if (key_pres ==1 ). 93 u_int_32 seq_num Sequence number to allow for packet order 94 Present if (seq_pres ==1 ). 95 struct gre_sre[] routing Routing fileds (see below) 96 Present if (rt_pres == 1) 97 */ 98 } __packed; 99 100 struct greip { 101 struct ip gi_i; 102 struct gre_h gi_g; 103 } __packed; 104 105 #define gi_pr gi_i.ip_p 106 #define gi_len gi_i.ip_len 107 #define gi_src gi_i.ip_src 108 #define gi_dst gi_i.ip_dst 109 #define gi_ptype gi_g.ptype 110 #define gi_flags gi_g.flags 111 #define gi_options gi_g.options 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 #define GREGKEY _IOWR('i', 107, struct ifreq) 177 #define GRESKEY _IOW('i', 108, struct ifreq) 178 179 #ifdef _KERNEL 180 LIST_HEAD(gre_softc_head, gre_softc); 181 extern struct mtx gre_mtx; 182 extern struct gre_softc_head gre_softc_list; 183 184 u_int16_t gre_in_cksum(u_int16_t *, u_int); 185 #endif /* _KERNEL */ 186 187 #endif 188