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_ifp; 59 LIST_ENTRY(gre_softc) sc_list; 60 int gre_unit; 61 int gre_flags; 62 u_int gre_fibnum; /* use this fib for envelopes */ 63 struct in_addr g_src; /* source address of gre packets */ 64 struct in_addr g_dst; /* destination address of gre packets */ 65 struct route route; /* routing entry that determines, where a 66 encapsulated packet should go */ 67 u_char g_proto; /* protocol of encapsulator */ 68 69 const struct encaptab *encap; /* encapsulation cookie */ 70 71 int called; /* infinite recursion preventer */ 72 73 wccp_ver_t wccp_ver; /* version of the WCCP */ 74 }; 75 #define GRE2IFP(sc) ((sc)->sc_ifp) 76 77 78 struct gre_h { 79 u_int16_t flags; /* GRE flags */ 80 u_int16_t ptype; /* protocol type of payload typically 81 Ether protocol type*/ 82 /* 83 * from here on: fields are optional, presence indicated by flags 84 * 85 u_int_16 checksum checksum (one-complements of GRE header 86 and payload 87 Present if (ck_pres | rt_pres == 1). 88 Valid if (ck_pres == 1). 89 u_int_16 offset offset from start of routing filed to 90 first octet of active SRE (see below). 91 Present if (ck_pres | rt_pres == 1). 92 Valid if (rt_pres == 1). 93 u_int_32 key inserted by encapsulator e.g. for 94 authentication 95 Present if (key_pres ==1 ). 96 u_int_32 seq_num Sequence number to allow for packet order 97 Present if (seq_pres ==1 ). 98 struct gre_sre[] routing Routing fileds (see below) 99 Present if (rt_pres == 1) 100 */ 101 } __packed; 102 103 struct greip { 104 struct ip gi_i; 105 struct gre_h gi_g; 106 } __packed; 107 108 #define gi_pr gi_i.ip_p 109 #define gi_len gi_i.ip_len 110 #define gi_src gi_i.ip_src 111 #define gi_dst gi_i.ip_dst 112 #define gi_ptype gi_g.ptype 113 #define gi_flags gi_g.flags 114 115 #define GRE_CP 0x8000 /* Checksum Present */ 116 #define GRE_RP 0x4000 /* Routing Present */ 117 #define GRE_KP 0x2000 /* Key Present */ 118 #define GRE_SP 0x1000 /* Sequence Present */ 119 #define GRE_SS 0x0800 /* Strict Source Route */ 120 121 /* 122 * CISCO uses special type for GRE tunnel created as part of WCCP 123 * connection, while in fact those packets are just IPv4 encapsulated 124 * into GRE. 125 */ 126 #define WCCP_PROTOCOL_TYPE 0x883E 127 128 /* 129 * gre_sre defines a Source route Entry. These are needed if packets 130 * should be routed over more than one tunnel hop by hop 131 */ 132 struct gre_sre { 133 u_int16_t sre_family; /* address family */ 134 u_char sre_offset; /* offset to first octet of active entry */ 135 u_char sre_length; /* number of octets in the SRE. 136 sre_lengthl==0 -> last entry. */ 137 u_char *sre_rtinfo; /* the routing information */ 138 }; 139 140 struct greioctl { 141 int unit; 142 struct in_addr addr; 143 }; 144 145 /* for mobile encaps */ 146 147 struct mobile_h { 148 u_int16_t proto; /* protocol and S-bit */ 149 u_int16_t hcrc; /* header checksum */ 150 u_int32_t odst; /* original destination address */ 151 u_int32_t osrc; /* original source addr, if S-bit set */ 152 } __packed; 153 154 struct mobip_h { 155 struct ip mi; 156 struct mobile_h mh; 157 } __packed; 158 159 160 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 161 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 162 #define MOB_H_SBIT 0x0080 163 164 #define GRE_TTL 30 165 166 #endif /* _KERNEL */ 167 168 /* 169 * ioctls needed to manipulate the interface 170 */ 171 172 #define GRESADDRS _IOW('i', 101, struct ifreq) 173 #define GRESADDRD _IOW('i', 102, struct ifreq) 174 #define GREGADDRS _IOWR('i', 103, struct ifreq) 175 #define GREGADDRD _IOWR('i', 104, struct ifreq) 176 #define GRESPROTO _IOW('i' , 105, struct ifreq) 177 #define GREGPROTO _IOWR('i', 106, 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