1 /* $OpenBSD: if_gre.h,v 1.13 2010/06/26 19:49:54 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 timeout sc_ka_hold; 40 struct timeout sc_ka_snd; 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 44 an encapsulated packet should go */ 45 u_int g_rtableid; /* routing table used for the tunnel */ 46 int gre_unit; 47 int gre_flags; 48 int sc_ka_timout; 49 int sc_ka_holdmax; 50 int sc_ka_holdcnt; 51 int sc_ka_cnt; 52 u_char g_proto; /* protocol of encapsulator */ 53 u_char sc_ka_state; 54 #define GRE_STATE_UKNWN 0 55 #define GRE_STATE_DOWN 1 56 #define GRE_STATE_HOLD 2 57 #define GRE_STATE_UP 3 58 }; 59 60 61 struct gre_h { 62 u_int16_t flags; /* GRE flags */ 63 u_int16_t ptype; /* protocol type of payload typically 64 Ether protocol type*/ 65 /* 66 * from here on: fields are optional, presence indicated by flags 67 * 68 u_int_16 checksum checksum (one-complements of GRE header 69 and payload 70 Present if (ck_pres | rt_pres == 1). 71 Valid if (ck_pres == 1). 72 u_int_16 offset offset from start of routing filed to 73 first octet of active SRE (see below). 74 Present if (ck_pres | rt_pres == 1). 75 Valid if (rt_pres == 1). 76 u_int_32 key inserted by encapsulator e.g. for 77 authentication 78 Present if (key_pres ==1 ). 79 u_int_32 seq_num Sequence number to allow for packet order 80 Present if (seq_pres ==1 ). 81 82 struct gre_sre[] routing Routing fileds (see below) 83 Present if (rt_pres == 1) 84 */ 85 } __packed; 86 87 struct greip { 88 struct ip gi_i; 89 struct gre_h gi_g; 90 } __packed; 91 92 #define gi_pr gi_i.ip_p 93 #define gi_len gi_i.ip_len 94 #define gi_src gi_i.ip_src 95 #define gi_dst gi_i.ip_dst 96 #define gi_ptype gi_g.ptype 97 #define gi_flags gi_g.flags 98 99 #define GRE_CP 0x8000 /* Checksum Present */ 100 #define GRE_RP 0x4000 /* Routing Present */ 101 #define GRE_KP 0x2000 /* Key Present */ 102 #define GRE_SP 0x1000 /* Sequence Present */ 103 #define GRE_SS 0x0800 /* Strict Source Route */ 104 105 /* gre_sre defines a Source route Entry. These are needed if packets 106 * should be routed over more than one tunnel hop by hop 107 */ 108 109 struct gre_sre { 110 u_int16_t sre_family; /* address family */ 111 u_char sre_offset; /* offset to first octet of active entry */ 112 u_char sre_length; /* number of octets in the SRE. 113 sre_lengthl==0 -> last entry. */ 114 u_char *sre_rtinfo; /* the routing information */ 115 }; 116 117 struct greioctl { 118 int unit; 119 struct in_addr addr; 120 }; 121 122 /* for mobile encaps */ 123 124 struct mobile_h { 125 u_int16_t proto; /* protocol and S-bit */ 126 u_int16_t hcrc; /* header checksum */ 127 u_int32_t odst; /* original destination address */ 128 u_int32_t osrc; /* original source addr, if S-bit set */ 129 } __packed; 130 131 struct mobip_h { 132 struct ip mi; 133 struct mobile_h mh; 134 } __packed; 135 136 137 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t)) 138 #define MOB_H_SIZ_L (sizeof(struct mobile_h)) 139 #define MOB_H_SBIT 0x0080 140 141 142 /* 143 * ioctls needed to manipulate the interface 144 */ 145 146 #ifdef _KERNEL 147 extern LIST_HEAD(gre_softc_head, gre_softc) gre_softc_list; 148 extern int gre_allow; 149 extern int gre_wccp; 150 extern int ip_mobile_allow; 151 152 void greattach(int); 153 int gre_ioctl(struct ifnet *, u_long, caddr_t); 154 int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *, 155 struct rtentry *); 156 u_int16_t gre_in_cksum(u_int16_t *, u_int); 157 void gre_recv_keepalive(struct gre_softc *); 158 #endif /* _KERNEL */ 159 #endif /* _NET_IF_GRE_H_ */ 160