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655929bfba
Kernel Appletalk protocol support both CAP and netatalk can make use of this.. still needs some owrk but it seemd the right tiime to commit it so other can experiment.
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/*
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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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