1 /* $NetBSD: if_gre.h,v 1.13 2003/11/10 08:51:52 wiz Exp $ */
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
36 #include <sys/ioccom.h>
38 #include <sys/queue.h>
41 * Version of the WCCP, need to be configured manually since
42 * header for version 2 is the same but IP payload is prepended
43 * with additional 4-bytes field.
52 LIST_ENTRY(gre_softc) sc_list;
55 u_int gre_fibnum; /* use this fib for envelopes */
56 struct in_addr g_src; /* source address of gre packets */
57 struct in_addr g_dst; /* destination address of gre packets */
58 struct route route; /* routing entry that determines, where a
59 encapsulated packet should go */
60 u_char g_proto; /* protocol of encapsulator */
62 const struct encaptab *encap; /* encapsulation cookie */
64 uint32_t key; /* key included in outgoing GRE packets */
67 wccp_ver_t wccp_ver; /* version of the WCCP */
69 #define GRE2IFP(sc) ((sc)->sc_ifp)
73 u_int16_t flags; /* GRE flags */
74 u_int16_t ptype; /* protocol type of payload typically
76 uint32_t options[0]; /* optional options */
78 * from here on: fields are optional, presence indicated by flags
80 u_int_16 checksum checksum (one-complements of GRE header
82 Present if (ck_pres | rt_pres == 1).
83 Valid if (ck_pres == 1).
84 u_int_16 offset offset from start of routing filed to
85 first octet of active SRE (see below).
86 Present if (ck_pres | rt_pres == 1).
87 Valid if (rt_pres == 1).
88 u_int_32 key inserted by encapsulator e.g. for
90 Present if (key_pres ==1 ).
91 u_int_32 seq_num Sequence number to allow for packet order
92 Present if (seq_pres ==1 ).
93 struct gre_sre[] routing Routing fileds (see below)
94 Present if (rt_pres == 1)
103 #define gi_pr gi_i.ip_p
104 #define gi_len gi_i.ip_len
105 #define gi_src gi_i.ip_src
106 #define gi_dst gi_i.ip_dst
107 #define gi_ptype gi_g.ptype
108 #define gi_flags gi_g.flags
109 #define gi_options gi_g.options
111 #define GRE_CP 0x8000 /* Checksum Present */
112 #define GRE_RP 0x4000 /* Routing Present */
113 #define GRE_KP 0x2000 /* Key Present */
114 #define GRE_SP 0x1000 /* Sequence Present */
115 #define GRE_SS 0x0800 /* Strict Source Route */
118 * CISCO uses special type for GRE tunnel created as part of WCCP
119 * connection, while in fact those packets are just IPv4 encapsulated
122 #define WCCP_PROTOCOL_TYPE 0x883E
125 * gre_sre defines a Source route Entry. These are needed if packets
126 * should be routed over more than one tunnel hop by hop
129 u_int16_t sre_family; /* address family */
130 u_char sre_offset; /* offset to first octet of active entry */
131 u_char sre_length; /* number of octets in the SRE.
132 sre_lengthl==0 -> last entry. */
133 u_char *sre_rtinfo; /* the routing information */
141 /* for mobile encaps */
144 u_int16_t proto; /* protocol and S-bit */
145 u_int16_t hcrc; /* header checksum */
146 u_int32_t odst; /* original destination address */
147 u_int32_t osrc; /* original source addr, if S-bit set */
156 #define MOB_H_SIZ_S (sizeof(struct mobile_h) - sizeof(u_int32_t))
157 #define MOB_H_SIZ_L (sizeof(struct mobile_h))
158 #define MOB_H_SBIT 0x0080
165 * ioctls needed to manipulate the interface
168 #define GRESADDRS _IOW('i', 101, struct ifreq)
169 #define GRESADDRD _IOW('i', 102, struct ifreq)
170 #define GREGADDRS _IOWR('i', 103, struct ifreq)
171 #define GREGADDRD _IOWR('i', 104, struct ifreq)
172 #define GRESPROTO _IOW('i' , 105, struct ifreq)
173 #define GREGPROTO _IOWR('i', 106, struct ifreq)
174 #define GREGKEY _IOWR('i', 107, struct ifreq)
175 #define GRESKEY _IOW('i', 108, struct ifreq)
178 LIST_HEAD(gre_softc_head, gre_softc);
179 extern struct mtx gre_mtx;
180 extern struct gre_softc_head gre_softc_list;
182 u_int16_t gre_in_cksum(u_int16_t *, u_int);