xref: /dragonfly/sys/net/gre/if_gre.h (revision 4b67a95d)
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