1 /* $OpenBSD: if_gre.h,v 1.10 2005/05/14 19:24:23 brad 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 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 #ifndef _NET_IF_GRE_H
41 #define _NET_IF_GRE_H
42
43 struct gre_softc {
44 struct ifnet sc_if;
45 LIST_ENTRY(gre_softc) sc_list;
46 int gre_unit;
47 int gre_flags;
48 struct in_addr g_src; /* source address of gre packets */
49 struct in_addr g_dst; /* destination address of gre packets */
50 struct route route; /* routing entry that determines, where a
51 encapsulated packet should go */
52 u_char g_proto; /* protocol of encapsulator */
53 };
54
55
56 struct gre_h {
57 u_int16_t flags; /* GRE flags */
58 u_int16_t ptype; /* protocol type of payload typically
59 Ether protocol type*/
60 /*
61 * from here on: fields are optional, presence indicated by flags
62 *
63 u_int_16 checksum checksum (one-complements of GRE header
64 and payload
65 Present if (ck_pres | rt_pres == 1).
66 Valid if (ck_pres == 1).
67 u_int_16 offset offset from start of routing filed to
68 first octet of active SRE (see below).
69 Present if (ck_pres | rt_pres == 1).
70 Valid if (rt_pres == 1).
71 u_int_32 key inserted by encapsulator e.g. for
72 authentication
73 Present if (key_pres ==1 ).
74 u_int_32 seq_num Sequence number to allow for packet order
75 Present if (seq_pres ==1 ).
76
77 struct gre_sre[] routing Routing fileds (see below)
78 Present if (rt_pres == 1)
79 */
80 } __packed;
81
82 struct greip {
83 struct ip gi_i;
84 struct gre_h gi_g;
85 } __packed;
86
87 #define gi_pr gi_i.ip_p
88 #define gi_len gi_i.ip_len
89 #define gi_src gi_i.ip_src
90 #define gi_dst gi_i.ip_dst
91 #define gi_ptype gi_g.ptype
92 #define gi_flags gi_g.flags
93
94 #define GRE_CP 0x8000 /* Checksum Present */
95 #define GRE_RP 0x4000 /* Routing Present */
96 #define GRE_KP 0x2000 /* Key Present */
97 #define GRE_SP 0x1000 /* Sequence Present */
98 #define GRE_SS 0x0800 /* Strict Source Route */
99
100 /* gre_sre defines a Source route Entry. These are needed if packets
101 * should be routed over more than one tunnel hop by hop
102 */
103
104 struct gre_sre {
105 u_int16_t sre_family; /* address family */
106 u_char sre_offset; /* offset to first octet of active entry */
107 u_char sre_length; /* number of octets in the SRE.
108 sre_lengthl==0 -> last entry. */
109 u_char *sre_rtinfo; /* the routing information */
110 };
111
112 struct greioctl {
113 int unit;
114 struct in_addr addr;
115 };
116
117 /* for mobile encaps */
118
119 struct mobile_h {
120 u_int16_t proto; /* protocol and S-bit */
121 u_int16_t hcrc; /* header checksum */
122 u_int32_t odst; /* original destination address */
123 u_int32_t osrc; /* original source addr, if S-bit set */
124 } __packed;
125
126 struct mobip_h {
127 struct ip mi;
128 struct mobile_h mh;
129 } __packed;
130
131
132 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
133 #define MOB_H_SIZ_L (sizeof(struct mobile_h))
134 #define MOB_H_SBIT 0x0080
135
136
137 /*
138 * ioctls needed to manipulate the interface
139 */
140
141 #ifdef _KERNEL
142 extern LIST_HEAD(gre_softc_head, gre_softc) gre_softc_list;
143 extern int gre_allow;
144 extern int gre_wccp;
145 extern int ip_mobile_allow;
146
147 void greattach(int);
148 int gre_ioctl(struct ifnet *, u_long, caddr_t);
149 int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *,
150 struct rtentry *);
151 u_int16_t gre_in_cksum(u_int16_t *, u_int);
152 #endif /* _KERNEL */
153 #endif /* _NET_IF_GRE_H_ */