FreeBSD/Linux Kernel Cross Reference
sys/net/if_gre.h
1 /* $NetBSD: if_gre.h,v 1.14 2005/02/26 22:45:09 perry Exp $ */
2
3 /*
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Heiko W.Rupp <hwr@pilhuhn.de>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #ifndef _NET_IF_GRE_H
40 #define _NET_IF_GRE_H
41
42 #include <sys/queue.h>
43
44 struct gre_softc {
45 struct ifnet sc_if;
46 LIST_ENTRY(gre_softc) sc_list;
47 int gre_unit;
48 int gre_flags;
49 struct in_addr g_src; /* source address of gre packets */
50 struct in_addr g_dst; /* destination address of gre packets */
51 struct route route; /* routing entry that determines, where a
52 encapsulated packet should go */
53 u_char g_proto; /* protocol of encapsulator */
54 };
55
56
57 struct gre_h {
58 u_int16_t flags; /* GRE flags */
59 u_int16_t ptype; /* protocol type of payload typically
60 Ether protocol type*/
61 /*
62 * from here on: fields are optional, presence indicated by flags
63 *
64 u_int_16 checksum checksum (one-complements of GRE header
65 and payload
66 Present if (ck_pres | rt_pres == 1).
67 Valid if (ck_pres == 1).
68 u_int_16 offset offset from start of routing filed to
69 first octet of active SRE (see below).
70 Present if (ck_pres | rt_pres == 1).
71 Valid if (rt_pres == 1).
72 u_int_32 key inserted by encapsulator e.g. for
73 authentication
74 Present if (key_pres ==1 ).
75 u_int_32 seq_num Sequence number to allow for packet order
76 Present if (seq_pres ==1 ).
77 struct gre_sre[] routing Routing fileds (see below)
78 Present if (rt_pres == 1)
79 */
80 } __attribute__((__packed__));
81
82 struct greip {
83 struct ip gi_i;
84 struct gre_h gi_g;
85 } __attribute__((__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 /*
101 * gre_sre defines a Source route Entry. These are needed if packets
102 * should be routed over more than one tunnel hop by hop
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 } __attribute__((__packed__));
125
126 struct mobip_h {
127 struct ip mi;
128 struct mobile_h mh;
129 } __attribute__((__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 #define GRE_TTL 30
137 extern int ip_gre_ttl;
138
139 /*
140 * ioctls needed to manipulate the interface
141 */
142
143 #define GRESADDRS _IOW('i', 101, struct ifreq)
144 #define GRESADDRD _IOW('i', 102, struct ifreq)
145 #define GREGADDRS _IOWR('i', 103, struct ifreq)
146 #define GREGADDRD _IOWR('i', 104, struct ifreq)
147 #define GRESPROTO _IOW('i' , 105, struct ifreq)
148 #define GREGPROTO _IOWR('i', 106, struct ifreq)
149
150 #ifdef _KERNEL
151 LIST_HEAD(gre_softc_head, gre_softc);
152 extern struct gre_softc_head gre_softc_list;
153
154 int gre_ioctl __P((struct ifnet *, u_long, caddr_t));
155 int gre_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
156 struct rtentry *));
157 u_int16_t gre_in_cksum(u_short *, u_int);
158 #endif /* _KERNEL */
159
160 #endif
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