FreeBSD/Linux Kernel Cross Reference
sys/net/if_gre.h
1 /* $NetBSD: if_gre.h,v 1.19 2006/11/16 22:32:38 dyoung 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 #ifdef _KERNEL
45 struct gre_soparm {
46 struct in_addr sp_src; /* source address of gre packets */
47 struct in_addr sp_dst; /* destination address of gre packets */
48 in_port_t sp_srcport; /* source port of gre packets */
49 in_port_t sp_dstport; /* destination port of gre packets */
50 struct file *sp_fp;
51 };
52
53 struct gre_softc {
54 struct ifnet sc_if;
55 int sc_waitchan;
56 int sc_thread;
57 struct ifqueue sc_snd;
58 struct gre_soparm sc_soparm;
59 LIST_ENTRY(gre_softc) sc_list;
60 struct route route; /* routing entry that determines, where a
61 encapsulated packet should go */
62 int sc_proto; /* protocol of encapsulator */
63 };
64 #define g_src sc_soparm.sp_src
65 #define g_srcport sc_soparm.sp_srcport
66 #define g_dst sc_soparm.sp_dst
67 #define g_dstport sc_soparm.sp_dstport
68 #define sc_fp sc_soparm.sp_fp
69
70 struct gre_h {
71 u_int16_t flags; /* GRE flags */
72 u_int16_t ptype; /* protocol type of payload typically
73 Ether protocol type*/
74 /*
75 * from here on: fields are optional, presence indicated by flags
76 *
77 u_int_16 checksum checksum (one-complements of GRE header
78 and payload
79 Present if (ck_pres | rt_pres == 1).
80 Valid if (ck_pres == 1).
81 u_int_16 offset offset from start of routing filed to
82 first octet of active SRE (see below).
83 Present if (ck_pres | rt_pres == 1).
84 Valid if (rt_pres == 1).
85 u_int_32 key inserted by encapsulator e.g. for
86 authentication
87 Present if (key_pres ==1 ).
88 u_int_32 seq_num Sequence number to allow for packet order
89 Present if (seq_pres ==1 ).
90 struct gre_sre[] routing Routing fileds (see below)
91 Present if (rt_pres == 1)
92 */
93 } __attribute__((__packed__));
94
95 struct greip {
96 struct ip gi_i;
97 struct gre_h gi_g;
98 } __attribute__((__packed__));
99
100 #define gi_pr gi_i.ip_p
101 #define gi_len gi_i.ip_len
102 #define gi_src gi_i.ip_src
103 #define gi_dst gi_i.ip_dst
104 #define gi_ptype gi_g.ptype
105 #define gi_flags gi_g.flags
106
107 #define GRE_CP 0x8000 /* Checksum Present */
108 #define GRE_RP 0x4000 /* Routing Present */
109 #define GRE_KP 0x2000 /* Key Present */
110 #define GRE_SP 0x1000 /* Sequence Present */
111 #define GRE_SS 0x0800 /* Strict Source Route */
112
113 /*
114 * gre_sre defines a Source route Entry. These are needed if packets
115 * should be routed over more than one tunnel hop by hop
116 */
117 struct gre_sre {
118 u_int16_t sre_family; /* address family */
119 u_char sre_offset; /* offset to first octet of active entry */
120 u_char sre_length; /* number of octets in the SRE.
121 sre_lengthl==0 -> last entry. */
122 u_char *sre_rtinfo; /* the routing information */
123 };
124
125 /* for mobile encaps */
126
127 struct mobile_h {
128 u_int16_t proto; /* protocol and S-bit */
129 u_int16_t hcrc; /* header checksum */
130 u_int32_t odst; /* original destination address */
131 u_int32_t osrc; /* original source addr, if S-bit set */
132 } __attribute__((__packed__));
133
134 struct mobip_h {
135 struct ip mi;
136 struct mobile_h mh;
137 } __attribute__((__packed__));
138
139
140 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
141 #define MOB_H_SIZ_L (sizeof(struct mobile_h))
142 #define MOB_H_SBIT 0x0080
143
144 #define GRE_TTL 30
145 extern int ip_gre_ttl;
146 #endif /* _KERNEL */
147
148 /*
149 * ioctls needed to manipulate the interface
150 */
151
152 #define GRESADDRS _IOW('i', 101, struct ifreq)
153 #define GRESADDRD _IOW('i', 102, struct ifreq)
154 #define GREGADDRS _IOWR('i', 103, struct ifreq)
155 #define GREGADDRD _IOWR('i', 104, struct ifreq)
156 #define GRESPROTO _IOW('i' , 105, struct ifreq)
157 #define GREGPROTO _IOWR('i', 106, struct ifreq)
158 #define GRESSOCK _IOW('i' , 107, struct ifreq)
159 #define GREDSOCK _IOW('i' , 108, struct ifreq)
160
161 #ifdef _KERNEL
162 LIST_HEAD(gre_softc_head, gre_softc);
163 extern struct gre_softc_head gre_softc_list;
164
165 u_int16_t gre_in_cksum(u_short *, u_int);
166 int gre_input3(struct gre_softc *, struct mbuf *, int, u_char,
167 const struct gre_h *);
168 #endif /* _KERNEL */
169
170 #endif /* !_NET_IF_GRE_H_ */
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