1 /* $NetBSD: if_gre.h,v 1.10 2002/02/24 17:22:20 martin Exp $ */ 2 /* $FreeBSD: src/sys/net/if_gre.h,v 1.6.2.2 2002/12/03 01:17:52 peter Exp $ */ 3 /* $DragonFly: src/sys/net/gre/if_gre.h,v 1.2 2003/06/17 04:28:48 dillon Exp $ */ 4 5 /* 6 * Copyright (c) 1998 The NetBSD Foundation, Inc. 7 * All rights reserved 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Heiko W.Rupp <hwr@pilhuhn.de> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41 #ifndef _NET_IF_GRE_H 42 #define _NET_IF_GRE_H 43 44 #include <sys/ioccom.h> 45 #ifdef _KERNEL 46 #include <sys/queue.h> 47 48 struct gre_softc { 49 struct ifnet sc_if; 50 LIST_ENTRY(gre_softc) sc_list; 51 int gre_unit; 52 int gre_flags; 53 struct in_addr g_src; /* source address of gre packets */ 54 struct in_addr g_dst; /* destination address of gre packets */ 55 struct route route; /* routing entry that determines, where a 56 encapsulated packet should go */ 57 u_char g_proto; /* protocol of encapsulator */ 58 59 const struct encaptab *encap; /* encapsulation cookie */ 60 61 int called; /* infinite recursion preventer */ 62 63 struct resource *r_unit;/* resource allocated for this unit */ 64 }; 65 66 67 struct gre_h { 68 u_int16_t flags; /* GRE flags */ 69 u_int16_t ptype; /* protocol type of payload typically 70 Ether protocol type*/ 71 /* 72 * from here on: fields are optional, presence indicated by flags 73 * 74 u_int_16 checksum checksum (one-complements of GRE header 75 and payload 76 Present if (ck_pres | rt_pres == 1). 77 Valid if (ck_pres == 1). 78 u_int_16 offset offset from start of routing filed to 79 first octet of active SRE (see below). 80 Present if (ck_pres | rt_pres == 1). 81 Valid if (rt_pres == 1). 82 u_int_32 key inserted by encapsulator e.g. for 83 authentication 84 Present if (key_pres ==1 ). 85 u_int_32 seq_num Sequence number to allow for packet order 86 Present if (seq_pres ==1 ). 87 struct gre_sre[] routing Routing fileds (see below) 88 Present if (rt_pres == 1) 89 */ 90 } __attribute__((__packed__)); 91 92 struct greip { 93 struct ip gi_i; 94 struct gre_h gi_g; 95 } __attribute__((__packed__)); 96 97 #define gi_pr gi_i.ip_p 98 #define gi_len gi_i.ip_len 99 #define gi_src gi_i.ip_src 100 #define gi_dst gi_i.ip_dst 101 #define gi_ptype gi_g.ptype 102 #define gi_flags gi_g.flags 103 104 #define GRE_CP 0x8000 /* Checksum Present */ 105 #define GRE_RP 0x4000 /* Routing Present */ 106 #define GRE_KP 0x2000 /* Key Present */ 107 #define GRE_SP 0x1000 /* Sequence Present */ 108 #define GRE_SS 0x0800 /* Strict Source Route */ 109 110 /* 111 * CISCO uses special type for GRE tunnel created as part of WCCP 112 * connection, while in fact those packets are just IPv4 encapsulated 113 * into GRE. 114 */ 115 #define WCCP_PROTOCOL_TYPE 0x883E 116 117 /* 118 * gre_sre defines a Source route Entry. These are needed if packets 119 * should be routed over more than one tunnel hop by hop 120 */ 121 struct gre_sre { 122 u_int16_t sre_family; /* adress family */ 123 u_char sre_offset; /* offset to first octet of active entry */ 124 u_char sre_length; /* number of octets in the SRE. 125 sre_lengthl==0 -> last entry. */ 126 u_char *sre_rtinfo; /* the routing information */ 127 }; 128 129 struct greioctl { 130 int unit; 131 struct in_addr addr; 132 }; 133 134 /* for mobile encaps */ 135 136 struct mobile_h { 137 u_int16_t proto; /* protocol and S-bit */ 138 u_int16_t hcrc; /* header checksum */ 139 u_int32_t odst; /* original destination address */ 140 u_int32_t osrc; /* original source addr, if S-bit set */ 141 } __attribute__((__packed__)); 142 143 struct mobip_h { 144 struct ip mi; 145 struct mobile_h mh; 146 } __attribute__((__packed__)); 147 148 149 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 150 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 151 #define MOB_H_SBIT 0x0080 152 153 #define GRE_TTL 30 154 155 #endif /* _KERNEL */ 156 157 /* 158 * ioctls needed to manipulate the interface 159 */ 160 161 #define GRESADDRS _IOW('i', 101, struct ifreq) 162 #define GRESADDRD _IOW('i', 102, struct ifreq) 163 #define GREGADDRS _IOWR('i', 103, struct ifreq) 164 #define GREGADDRD _IOWR('i', 104, struct ifreq) 165 #define GRESPROTO _IOW('i' , 105, struct ifreq) 166 #define GREGPROTO _IOWR('i', 106, struct ifreq) 167 168 #ifdef _KERNEL 169 LIST_HEAD(gre_softc_head, gre_softc); 170 extern struct gre_softc_head gre_softc_list; 171 172 u_short gre_in_cksum(u_short *p, u_int len); 173 #endif /* _KERNEL */ 174 175 #endif 176