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