FreeBSD/Linux Kernel Cross Reference
sys/net/if_gre.h
1 /* $NetBSD: if_gre.h,v 1.10 2002/02/24 17:22:20 martin Exp $ */
2 /* $FreeBSD$ */
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 #include <sys/ioccom.h>
44 #ifdef _KERNEL
45 #include <sys/queue.h>
46
47 struct gre_softc {
48 struct ifnet sc_if;
49 LIST_ENTRY(gre_softc) sc_list;
50 int gre_unit;
51 int gre_flags;
52 struct in_addr g_src; /* source address of gre packets */
53 struct in_addr g_dst; /* destination address of gre packets */
54 struct route route; /* routing entry that determines, where a
55 encapsulated packet should go */
56 u_char g_proto; /* protocol of encapsulator */
57
58 const struct encaptab *encap; /* encapsulation cookie */
59
60 int called; /* infinite recursion preventer */
61
62 struct resource *r_unit;/* resource allocated for this unit */
63 };
64
65
66 struct gre_h {
67 u_int16_t flags; /* GRE flags */
68 u_int16_t ptype; /* protocol type of payload typically
69 Ether protocol type*/
70 /*
71 * from here on: fields are optional, presence indicated by flags
72 *
73 u_int_16 checksum checksum (one-complements of GRE header
74 and payload
75 Present if (ck_pres | rt_pres == 1).
76 Valid if (ck_pres == 1).
77 u_int_16 offset offset from start of routing filed to
78 first octet of active SRE (see below).
79 Present if (ck_pres | rt_pres == 1).
80 Valid if (rt_pres == 1).
81 u_int_32 key inserted by encapsulator e.g. for
82 authentication
83 Present if (key_pres ==1 ).
84 u_int_32 seq_num Sequence number to allow for packet order
85 Present if (seq_pres ==1 ).
86 struct gre_sre[] routing Routing fileds (see below)
87 Present if (rt_pres == 1)
88 */
89 } __attribute__((__packed__));
90
91 struct greip {
92 struct ip gi_i;
93 struct gre_h gi_g;
94 } __attribute__((__packed__));
95
96 #define gi_pr gi_i.ip_p
97 #define gi_len gi_i.ip_len
98 #define gi_src gi_i.ip_src
99 #define gi_dst gi_i.ip_dst
100 #define gi_ptype gi_g.ptype
101 #define gi_flags gi_g.flags
102
103 #define GRE_CP 0x8000 /* Checksum Present */
104 #define GRE_RP 0x4000 /* Routing Present */
105 #define GRE_KP 0x2000 /* Key Present */
106 #define GRE_SP 0x1000 /* Sequence Present */
107 #define GRE_SS 0x0800 /* Strict Source Route */
108
109 /*
110 * CISCO uses special type for GRE tunnel created as part of WCCP
111 * connection, while in fact those packets are just IPv4 encapsulated
112 * into GRE.
113 */
114 #define WCCP_PROTOCOL_TYPE 0x883E
115
116 /*
117 * gre_sre defines a Source route Entry. These are needed if packets
118 * should be routed over more than one tunnel hop by hop
119 */
120 struct gre_sre {
121 u_int16_t sre_family; /* adress family */
122 u_char sre_offset; /* offset to first octet of active entry */
123 u_char sre_length; /* number of octets in the SRE.
124 sre_lengthl==0 -> last entry. */
125 u_char *sre_rtinfo; /* the routing information */
126 };
127
128 struct greioctl {
129 int unit;
130 struct in_addr addr;
131 };
132
133 /* for mobile encaps */
134
135 struct mobile_h {
136 u_int16_t proto; /* protocol and S-bit */
137 u_int16_t hcrc; /* header checksum */
138 u_int32_t odst; /* original destination address */
139 u_int32_t osrc; /* original source addr, if S-bit set */
140 } __attribute__((__packed__));
141
142 struct mobip_h {
143 struct ip mi;
144 struct mobile_h mh;
145 } __attribute__((__packed__));
146
147
148 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
149 #define MOB_H_SIZ_L (sizeof(struct mobile_h))
150 #define MOB_H_SBIT 0x0080
151
152 #define GRE_TTL 30
153
154 #endif /* _KERNEL */
155
156 /*
157 * ioctls needed to manipulate the interface
158 */
159
160 #define GRESADDRS _IOW('i', 101, struct ifreq)
161 #define GRESADDRD _IOW('i', 102, struct ifreq)
162 #define GREGADDRS _IOWR('i', 103, struct ifreq)
163 #define GREGADDRD _IOWR('i', 104, struct ifreq)
164 #define GRESPROTO _IOW('i' , 105, struct ifreq)
165 #define GREGPROTO _IOWR('i', 106, struct ifreq)
166
167 #ifdef _KERNEL
168 LIST_HEAD(gre_softc_head, gre_softc);
169 extern struct gre_softc_head gre_softc_list;
170
171 u_short gre_in_cksum(u_short *p, u_int len);
172 #endif /* _KERNEL */
173
174 #endif
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