1 /* $OpenBSD: if_gre.h,v 1.12 2009/11/21 14:08:14 claudio 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 struct in_addr g_src; /* source address of gre packets */ 40 struct in_addr g_dst; /* destination address of gre packets */ 41 struct route route; /* routing entry that determines, where a 42 encapsulated packet should go */ 43 int gre_unit; 44 int gre_flags; 45 u_int g_rtableid; /* routing table used for the tunnel */ 46 u_char g_proto; /* protocol of encapsulator */ 47 }; 48 49 50 struct gre_h { 51 u_int16_t flags; /* GRE flags */ 52 u_int16_t ptype; /* protocol type of payload typically 53 Ether protocol type*/ 54 /* 55 * from here on: fields are optional, presence indicated by flags 56 * 57 u_int_16 checksum checksum (one-complements of GRE header 58 and payload 59 Present if (ck_pres | rt_pres == 1). 60 Valid if (ck_pres == 1). 61 u_int_16 offset offset from start of routing filed to 62 first octet of active SRE (see below). 63 Present if (ck_pres | rt_pres == 1). 64 Valid if (rt_pres == 1). 65 u_int_32 key inserted by encapsulator e.g. for 66 authentication 67 Present if (key_pres ==1 ). 68 u_int_32 seq_num Sequence number to allow for packet order 69 Present if (seq_pres ==1 ). 70 71 struct gre_sre[] routing Routing fileds (see below) 72 Present if (rt_pres == 1) 73 */ 74 } __packed; 75 76 struct greip { 77 struct ip gi_i; 78 struct gre_h gi_g; 79 } __packed; 80 81 #define gi_pr gi_i.ip_p 82 #define gi_len gi_i.ip_len 83 #define gi_src gi_i.ip_src 84 #define gi_dst gi_i.ip_dst 85 #define gi_ptype gi_g.ptype 86 #define gi_flags gi_g.flags 87 88 #define GRE_CP 0x8000 /* Checksum Present */ 89 #define GRE_RP 0x4000 /* Routing Present */ 90 #define GRE_KP 0x2000 /* Key Present */ 91 #define GRE_SP 0x1000 /* Sequence Present */ 92 #define GRE_SS 0x0800 /* Strict Source Route */ 93 94 /* gre_sre defines a Source route Entry. These are needed if packets 95 * should be routed over more than one tunnel hop by hop 96 */ 97 98 struct gre_sre { 99 u_int16_t sre_family; /* address family */ 100 u_char sre_offset; /* offset to first octet of active entry */ 101 u_char sre_length; /* number of octets in the SRE. 102 sre_lengthl==0 -> last entry. */ 103 u_char *sre_rtinfo; /* the routing information */ 104 }; 105 106 struct greioctl { 107 int unit; 108 struct in_addr addr; 109 }; 110 111 /* for mobile encaps */ 112 113 struct mobile_h { 114 u_int16_t proto; /* protocol and S-bit */ 115 u_int16_t hcrc; /* header checksum */ 116 u_int32_t odst; /* original destination address */ 117 u_int32_t osrc; /* original source addr, if S-bit set */ 118 } __packed; 119 120 struct mobip_h { 121 struct ip mi; 122 struct mobile_h mh; 123 } __packed; 124 125 126 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 127 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 128 #define MOB_H_SBIT 0x0080 129 130 131 /* 132 * ioctls needed to manipulate the interface 133 */ 134 135 #ifdef _KERNEL 136 extern LIST_HEAD(gre_softc_head, gre_softc) gre_softc_list; 137 extern int gre_allow; 138 extern int gre_wccp; 139 extern int ip_mobile_allow; 140 141 void greattach(int); 142 int gre_ioctl(struct ifnet *, u_long, caddr_t); 143 int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 144 struct rtentry *); 145 u_int16_t gre_in_cksum(u_int16_t *, u_int); 146 #endif /* _KERNEL */ 147 #endif /* _NET_IF_GRE_H_ */ 148