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