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134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
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/*
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* Copyright (c) 1990,1991 Regents of The University of Michigan.
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* All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation, and that the name of The University
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* of Michigan not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. This software is supplied as is without expressed or
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* implied warranties of any kind.
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*
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* Research Systems Unix Group
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* The University of Michigan
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* c/o Mike Clark
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* 535 W. William Street
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* Ann Arbor, Michigan
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* +1-313-763-0525
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* netatalk@itd.umich.edu
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*/
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#ifndef _NETATALK_DDP_H_
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#define _NETATALK_DDP_H_ 1
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/*
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* <-1byte(8bits) ->
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* +---------------+
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* | 0 | hopc |len|
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* +---------------+
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* | len (cont) |
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* +---------------+
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* | |
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* +- DDP csum -+
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* | |
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* +---------------+
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* | |
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* +- Dest NET -+
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* | |
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* +---------------+
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* | |
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* +- Src NET -+
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* | |
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* +---------------+
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* | Dest NODE |
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* +---------------+
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* | Src NODE |
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* +---------------+
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* | Dest PORT |
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* +---------------+
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* | Src PORT |
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* +---------------+
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*
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* On Apples, there is also a ddp_type field, after src_port. However,
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* under this unix implementation, user level processes need to be able
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* to set the ddp_type. In later revisions, the ddp_type may only be
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* available in a raw_appletalk interface.
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*/
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struct elaphdr {
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u_char el_dnode;
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u_char el_snode;
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u_char el_type;
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};
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#define SZ_ELAPHDR 3
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#define ELAP_DDPSHORT 0x01
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#define ELAP_DDPEXTEND 0x02
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/*
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* Extended DDP header. Includes sickness for dealing with arbitrary
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* bitfields on a little-endian arch.
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*/
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struct ddpehdr {
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union {
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struct {
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#if BYTE_ORDER == BIG_ENDIAN
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unsigned dub_pad:2;
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unsigned dub_hops:4;
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unsigned dub_len:10;
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unsigned dub_sum:16;
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned dub_sum:16;
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unsigned dub_len:10;
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unsigned dub_hops:4;
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unsigned dub_pad:2;
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#endif
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} du_bits;
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unsigned du_bytes;
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} deh_u;
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#define deh_pad deh_u.du_bits.dub_pad
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#define deh_hops deh_u.du_bits.dub_hops
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#define deh_len deh_u.du_bits.dub_len
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#define deh_sum deh_u.du_bits.dub_sum
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#define deh_bytes deh_u.du_bytes
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u_short deh_dnet;
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u_short deh_snet;
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u_char deh_dnode;
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u_char deh_snode;
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u_char deh_dport;
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u_char deh_sport;
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};
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#define DDP_MAXHOPS 15
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struct ddpshdr {
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union {
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struct {
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#if BYTE_ORDER == BIG_ENDIAN
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unsigned dub_pad:6;
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unsigned dub_len:10;
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unsigned dub_dport:8;
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unsigned dub_sport:8;
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN
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unsigned dub_sport:8;
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unsigned dub_dport:8;
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unsigned dub_len:10;
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unsigned dub_pad:6;
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#endif
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} du_bits;
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unsigned du_bytes;
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} dsh_u;
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#define dsh_pad dsh_u.du_bits.dub_pad
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#define dsh_len dsh_u.du_bits.dub_len
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#define dsh_dport dsh_u.du_bits.dub_dport
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#define dsh_sport dsh_u.du_bits.dub_sport
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#define dsh_bytes dsh_u.du_bytes
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};
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#endif /* _NETATALK_DDP_H_ */
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