xref: /original-bsd/libexec/rbootd/rmp.h (revision a458f320)
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  * %sccs.include.redist.c%
14  *
15  *	@(#)rmp.h	8.1 (Berkeley) 06/04/93
16  *
17  * Utah $Hdr: rmp.h 3.1 92/07/06$
18  * Author: Jeff Forys, University of Utah CSS
19  */
20 
21 /*
22  *  Define MIN/MAX sizes of RMP (ethernet) packet.
23  *  For ease of computation, the 4 octet CRC field is not included.
24  *
25  *  MCLBYTES is for bpfwrite(); it is adamant about using a cluster.
26  */
27 
28 #define	RMP_MAX_PACKET	MIN(1514,MCLBYTES)
29 #define	RMP_MIN_PACKET	60
30 
31 /*
32  *  Define RMP/Ethernet Multicast address (9:0:9:0:0:4) and its length.
33  */
34 #define	RMP_ADDR	{ 0x9, 0x0, 0x9, 0x0, 0x0, 0x4 }
35 #define	RMP_ADDRLEN	6
36 
37 /*
38  *  Define IEEE802.2 (Logical Link Control) information.
39  */
40 #define	IEEE_DSAP_HP	0xF8	/* Destination Service Access Point */
41 #define	IEEE_SSAP_HP	0xF8	/* Source Service Access Point */
42 #define	IEEE_CNTL_HP	0x0300	/* Type 1 / I format control information */
43 
44 #define	HPEXT_DXSAP	0x608	/* HP Destination Service Access Point */
45 #define	HPEXT_SXSAP	0x609	/* HP Source Service Access Point */
46 
47 /*
48  *  802.3-style "Ethernet" header.
49  */
50 
51 struct hp_hdr {
52 	u_char	daddr[RMP_ADDRLEN];
53 	u_char	saddr[RMP_ADDRLEN];
54 	u_short	len;
55 };
56 
57 /*
58  * HP uses 802.2 LLC with their own local extensions.  This struct makes
59  * sence out of this data (encapsulated in the above 802.3 packet).
60  */
61 
62 struct hp_llc {
63 	u_char	dsap;		/* 802.2 DSAP */
64 	u_char	ssap;		/* 802.2 SSAP */
65 	u_short	cntrl;		/* 802.2 control field */
66 	u_short	filler;		/* HP filler (must be zero) */
67 	u_short	dxsap;		/* HP extended DSAP */
68 	u_short	sxsap;		/* HP extended SSAP */
69 };
70