rmp.h revision 262435 
1/*
2 * Copyright (c) 1988, 1992 The University of Utah and the Center
3 *	for Software Science (CSS).
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Center for Software Science of the University of Utah Computer
9 * Science Department.  CSS requests users of this software to return
10 * to css-dist@cs.utah.edu any improvements that they make and grant
11 * CSS redistribution rights.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	from: @(#)rmp.h	8.1 (Berkeley) 6/4/93
38 *
39 * From: Utah Hdr: rmp.h 3.1 92/07/06
40 * Author: Jeff Forys, University of Utah CSS
41 *
42 * $FreeBSD: stable/10/libexec/rbootd/rmp.h 262435 2014-02-24 08:21:49Z brueffer $
43 */
44
45/*
46 *  Define MIN/MAX sizes of RMP (ethernet) packet.
47 *  For ease of computation, the 4 octet CRC field is not included.
48 *
49 *  MCLBYTES is for bpfwrite(); it is adamant about using a cluster.
50 */
51
52#define	RMP_MAX_PACKET	MIN(1514,MCLBYTES)
53#define	RMP_MIN_PACKET	60
54
55/*
56 *  Define RMP/Ethernet Multicast address (9:0:9:0:0:4) and its length.
57 */
58#define	RMP_ADDR	{ 0x9, 0x0, 0x9, 0x0, 0x0, 0x4 }
59#define	RMP_ADDRLEN	6
60
61/*
62 *  Define IEEE802.2 (Logical Link Control) information.
63 */
64#define	IEEE_DSAP_HP	0xF8	/* Destination Service Access Point */
65#define	IEEE_SSAP_HP	0xF8	/* Source Service Access Point */
66#define	IEEE_CNTL_HP	0x0300	/* Type 1 / I format control information */
67
68#define	HPEXT_DXSAP	0x608	/* HP Destination Service Access Point */
69#define	HPEXT_SXSAP	0x609	/* HP Source Service Access Point */
70
71/*
72 *  802.3-style "Ethernet" header.
73 */
74
75struct hp_hdr {
76	u_int8_t	daddr[RMP_ADDRLEN];
77	u_int8_t	saddr[RMP_ADDRLEN];
78	u_int16_t	len;
79};
80
81/*
82 * HP uses 802.2 LLC with their own local extensions.  This struct makes
83 * sense out of this data (encapsulated in the above 802.3 packet).
84 */
85
86struct hp_llc {
87	u_int8_t	dsap;		/* 802.2 DSAP */
88	u_int8_t	ssap;		/* 802.2 SSAP */
89	u_int16_t	cntrl;		/* 802.2 control field */
90	u_int16_t	filler;		/* HP filler (must be zero) */
91	u_int16_t	dxsap;		/* HP extended DSAP */
92	u_int16_t	sxsap;		/* HP extended SSAP */
93};
94