trn.h

用于嵌入式系统的TCP/IP协议栈及若干服务

/*
*            Copyright (c) 1998-2001 by NETsilicon Inc.
*
*  This software is copyrighted by and is the sole property of
*  NETsilicon.  All rights, title, ownership, or other interests
*  in the software remain the property of NETsilicon.  This
*  software may only be used in accordance with the corresponding
*  license agreement.  Any unauthorized use, duplication, transmission,
*  distribution, or disclosure of this software is expressly forbidden.
*
*  This Copyright notice may not be removed or modified without prior
*  written consent of NETsilicon.
*
*  NETsilicon, reserves the right to modify this software
*  without notice.
*
*  NETsilicon
*  411 Waverley Oaks Road                  USA 781.647.1234
*  Suite 227                               http://www.netsilicon.com
*  Waltham, MA 02452                       [e-mail]
*
*************************************************************************
*  $Name: Fusion 6.52 Fusion 6.51 $
*  $Date: 2001/09/20 10:19:25 $
*  $Source: M:/psisrc/stack/incl/rcs/trn.h $
*  $Revision: 1.8 $
**************************************************************************
*  File Description:  Token-Ring layer definitions
*
**************************************************************************/

#ifndef _TRN_
#define _TRN_

#include "config.h"
#include "ccdep.h"

#define TR_MAX_PACKET   2046    /* max packet for proteon boards */
                 				/* max data for proteon boards */
#define TR_MAX_DATA     (TR_MAX_PACKET-sizeof(trnh))

/* OL: following structures need to be packed */

/* trn link layer header */
typedef u8 TRNH;

#define TRNH_SAC    0                 /* access control, 1 byte */
#define TRNH_SFC    (TRNH_SAC+1)      /* frame control, 1 byte */
#define TRNH_DEST   (TRNH_SFC+1)      /* destination tr address, 6 bytes */
#define TRNH_SRC    (TRNH_DEST+6)     /* source tr address with ri (trnh_pad) bit, 6 bytes */
#define TRNH_PAD    (TRNH_SRC+6)      /* token ring routing field, 18 bytes */
	/* See RFC 1042 for the following interpretations - SNAP */
#define TRNH_DSAP   (TRNH_PAD+18)     /* 170 = AA, This and SSAP being AA means, 1 byte */
#define TRNH_SSAP   (TRNH_DSAP+1)     /* sub network access protocol, 1 byte */

#ifdef  RFC1042

#define TRNH_CONTROL (TRNH_SSAP+1)    /* is 0x03 - unnumbered information, 1 byte */
#define TRNH_PIOC   (TRNH_CONTROL+1)  /* 3 zeros of protocol id or org code, 3 bytes */
#define TRNH_TYPE   (TRNH_PIOC+3)     /* as in ethenet type, 2 bytes */
#define SIZEOF_TRNH (TRNH_TYPE+2)

#else

#define TRNH_DLCTR  (TRNH_SSAP+1)     /* 2 bytes */
#define TRNH_DLFLD  (TRNH_DLCTR+2)    /* 2 bytes */
#define SIZEOF_TRNH (TRNH_DLFLD+2)

#endif



typedef u8 TRNP_T;

#define TRNH_SAC    0                 /* 1 byte */
#define TRNH_SFC    (TRNH_SAC+1)      /* 1 byte */
#define TRNH_DEST   (TRNH_SFC+1)      /* 6 bytes */
#define TRNH_SRC    (TRNH_DEST+6)     /* 6 bytes */
#define TRNH_PAD    (TRNH_SRC+6)      /* 18 bytes */
#define TRNH_DSAP   (TRNH_PAD+18)     /* 1 byte */
#define TRNH_SSAP   (TRNH_DSAP+1)     /* 1 byte */

#ifdef  RFC1042

#define TRNH_CONTROL (TRNH_SSAP+1)    /* 1 byte */
#define TRNH_PIOC   (TRNH_CONTROL+1)  /* 3 bytes */
#define TRNH_TYPE   (TRNH_PIOC+3)     /* 2 bytes */
#define TRHN_PLACE_HOLDER (TRNH_TYPE+2)

#else

#define TRNH_DLCTR  (TRNH_SSAP+1)     /* 2 bytes */
#define TRNH_DLFLD  (TRNH_DLCTR+2)    /* 2 bytes */
#define TRHN_PLACE_HOLDER (TRNH_DLFLD+2)

#endif
#define TR_DATA     TRHN_PLACE_HOLDER /* TR_MAX_DATA bytes */
#define SIZEOF_TRNP_T (TR_DATA+TR_MAX_DATA)

/* End of packed structures */

#define TR_AC    0x40
#define TR_FC    0x40

#ifdef  RFC1042
/* values for trnh_dsap and trnh_ssap */
#define TR_K1    0xAA           /* 170 in decimal - means Unnumbered Info */
#define TR_SNAP  0x03           /* RFC 1042 SNAP Unnumbered Information */
#define TR_K2    0x00           /* three bytes of zeros */

#define TR_HDR_SIZE 42

/* The protocol codes, using SNAP, are a carry over from Ethernet */
#define TR_XNS   0x0600
#define TR_IP    0x0800
#define TR_ARP   0x0806
#define TRN_RAW  0x0000

#else

#define TR_DLCTR 0x0003
#define TR_DLFLD 0x0600

#define TR_HDR_SIZE 38

#define TR_XNS      0x81 
#define TR_IP       0x06 
#define TR_ARP      0x84 
#define TRN_RAW     0x88 
#define TR_MSGS     0x80 
#define TR_RARP     0x00 
#endif  /* RFC1042 */

#define TR_RQ_MAX   5 

#endif  /*_TRN_*/