1 /* $OpenBSD: if_gre.h,v 1.11 2008/06/26 05:42:20 ray Exp $ */ 2 /* $NetBSD: if_gre.h,v 1.5 1999/11/19 20:41:19 thorpej Exp $ */ 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 struct gre_softc { 37 struct ifnet sc_if; 38 LIST_ENTRY(gre_softc) sc_list; 39 int gre_unit; 40 int gre_flags; 41 struct in_addr g_src; /* source address of gre packets */ 42 struct in_addr g_dst; /* destination address of gre packets */ 43 struct route route; /* routing entry that determines, where a 44 encapsulated packet should go */ 45 u_char g_proto; /* protocol of encapsulator */ 46 }; 47 48 49 struct gre_h { 50 u_int16_t flags; /* GRE flags */ 51 u_int16_t ptype; /* protocol type of payload typically 52 Ether protocol type*/ 53 /* 54 * from here on: fields are optional, presence indicated by flags 55 * 56 u_int_16 checksum checksum (one-complements of GRE header 57 and payload 58 Present if (ck_pres | rt_pres == 1). 59 Valid if (ck_pres == 1). 60 u_int_16 offset offset from start of routing filed to 61 first octet of active SRE (see below). 62 Present if (ck_pres | rt_pres == 1). 63 Valid if (rt_pres == 1). 64 u_int_32 key inserted by encapsulator e.g. for 65 authentication 66 Present if (key_pres ==1 ). 67 u_int_32 seq_num Sequence number to allow for packet order 68 Present if (seq_pres ==1 ). 69 70 struct gre_sre[] routing Routing fileds (see below) 71 Present if (rt_pres == 1) 72 */ 73 } __packed; 74 75 struct greip { 76 struct ip gi_i; 77 struct gre_h gi_g; 78 } __packed; 79 80 #define gi_pr gi_i.ip_p 81 #define gi_len gi_i.ip_len 82 #define gi_src gi_i.ip_src 83 #define gi_dst gi_i.ip_dst 84 #define gi_ptype gi_g.ptype 85 #define gi_flags gi_g.flags 86 87 #define GRE_CP 0x8000 /* Checksum Present */ 88 #define GRE_RP 0x4000 /* Routing Present */ 89 #define GRE_KP 0x2000 /* Key Present */ 90 #define GRE_SP 0x1000 /* Sequence Present */ 91 #define GRE_SS 0x0800 /* Strict Source Route */ 92 93 /* gre_sre defines a Source route Entry. These are needed if packets 94 * should be routed over more than one tunnel hop by hop 95 */ 96 97 struct gre_sre { 98 u_int16_t sre_family; /* address family */ 99 u_char sre_offset; /* offset to first octet of active entry */ 100 u_char sre_length; /* number of octets in the SRE. 101 sre_lengthl==0 -> last entry. */ 102 u_char *sre_rtinfo; /* the routing information */ 103 }; 104 105 struct greioctl { 106 int unit; 107 struct in_addr addr; 108 }; 109 110 /* for mobile encaps */ 111 112 struct mobile_h { 113 u_int16_t proto; /* protocol and S-bit */ 114 u_int16_t hcrc; /* header checksum */ 115 u_int32_t odst; /* original destination address */ 116 u_int32_t osrc; /* original source addr, if S-bit set */ 117 } __packed; 118 119 struct mobip_h { 120 struct ip mi; 121 struct mobile_h mh; 122 } __packed; 123 124 125 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 126 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 127 #define MOB_H_SBIT 0x0080 128 129 130 /* 131 * ioctls needed to manipulate the interface 132 */ 133 134 #ifdef _KERNEL 135 extern LIST_HEAD(gre_softc_head, gre_softc) gre_softc_list; 136 extern int gre_allow; 137 extern int gre_wccp; 138 extern int ip_mobile_allow; 139 140 void greattach(int); 141 int gre_ioctl(struct ifnet *, u_long, caddr_t); 142 int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 143 struct rtentry *); 144 u_int16_t gre_in_cksum(u_int16_t *, u_int); 145 #endif /* _KERNEL */ 146 #endif /* _NET_IF_GRE_H_ */ 147