Annotation of sys/net/if_gre.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: if_gre.h,v 1.10 2005/05/14 19:24:23 brad Exp $ */
2: /* $NetBSD: if_gre.h,v 1.5 1999/11/19 20:41:19 thorpej Exp $ */
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: struct gre_softc {
44: struct ifnet sc_if;
45: LIST_ENTRY(gre_softc) sc_list;
46: int gre_unit;
47: int gre_flags;
48: struct in_addr g_src; /* source address of gre packets */
49: struct in_addr g_dst; /* destination address of gre packets */
50: struct route route; /* routing entry that determines, where a
51: encapsulated packet should go */
52: u_char g_proto; /* protocol of encapsulator */
53: };
54:
55:
56: struct gre_h {
57: u_int16_t flags; /* GRE flags */
58: u_int16_t ptype; /* protocol type of payload typically
59: Ether protocol type*/
60: /*
61: * from here on: fields are optional, presence indicated by flags
62: *
63: u_int_16 checksum checksum (one-complements of GRE header
64: and payload
65: Present if (ck_pres | rt_pres == 1).
66: Valid if (ck_pres == 1).
67: u_int_16 offset offset from start of routing filed to
68: first octet of active SRE (see below).
69: Present if (ck_pres | rt_pres == 1).
70: Valid if (rt_pres == 1).
71: u_int_32 key inserted by encapsulator e.g. for
72: authentication
73: Present if (key_pres ==1 ).
74: u_int_32 seq_num Sequence number to allow for packet order
75: Present if (seq_pres ==1 ).
76:
77: struct gre_sre[] routing Routing fileds (see below)
78: Present if (rt_pres == 1)
79: */
80: } __packed;
81:
82: struct greip {
83: struct ip gi_i;
84: struct gre_h gi_g;
85: } __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: /* gre_sre defines a Source route Entry. These are needed if packets
101: * should be routed over more than one tunnel hop by hop
102: */
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: } __packed;
125:
126: struct mobip_h {
127: struct ip mi;
128: struct mobile_h mh;
129: } __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:
137: /*
138: * ioctls needed to manipulate the interface
139: */
140:
141: #ifdef _KERNEL
142: extern LIST_HEAD(gre_softc_head, gre_softc) gre_softc_list;
143: extern int gre_allow;
144: extern int gre_wccp;
145: extern int ip_mobile_allow;
146:
147: void greattach(int);
148: int gre_ioctl(struct ifnet *, u_long, caddr_t);
149: int gre_output(struct ifnet *, struct mbuf *, struct sockaddr *,
150: struct rtentry *);
151: u_int16_t gre_in_cksum(u_int16_t *, u_int);
152: #endif /* _KERNEL */
153: #endif /* _NET_IF_GRE_H_ */
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