ddp.h File Reference

#include "endian.h"

Go to the source code of this file.

Data Structures
struct	elaphdr
struct	ddpehdr
struct	ddpshdr

Macros
#define	SZ_ELAPHDR   3
#define	ELAP_DDPSHORT   0x01
#define	ELAP_DDPEXTEND   0x02
#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
#define	SZ_DDPEHDR   12
#define	DDP_MAXHOPS   15
#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
#define	SZ_DDPSHDR   4

Detailed Description

<-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.

Macro Definition Documentation

DDP_MAXHOPS

#define DDP_MAXHOPS   15

deh_bytes

#define deh_bytes   deh_u.du_bytes

deh_hops

#define deh_hops   deh_u.du_bits.dub_hops

deh_len

#define deh_len   deh_u.du_bits.dub_len

deh_pad

#define deh_pad   deh_u.du_bits.dub_pad

deh_sum

#define deh_sum   deh_u.du_bits.dub_sum

dsh_bytes

#define dsh_bytes   dsh_u.du_bytes

dsh_dport

#define dsh_dport   dsh_u.du_bits.dub_dport

dsh_len

#define dsh_len   dsh_u.du_bits.dub_len

dsh_pad

#define dsh_pad   dsh_u.du_bits.dub_pad

dsh_sport

#define dsh_sport   dsh_u.du_bits.dub_sport

ELAP_DDPEXTEND

#define ELAP_DDPEXTEND   0x02

ELAP_DDPSHORT

#define ELAP_DDPSHORT   0x01

SZ_DDPEHDR

#define SZ_DDPEHDR   12

SZ_DDPSHDR

#define SZ_DDPSHDR   4

SZ_ELAPHDR

#define SZ_ELAPHDR   3