udp.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: 2001/12/06 10:14:23 $
*  $Source: M:/psisrc/stack/incl/rcs/udp.h $
*  $Revision: 1.9 $
**************************************************************************
*  File Description:  UDP (User Datagram Protocol) defines
*
**************************************************************************/

#ifndef _UDP_
#define _UDP_

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

typedef u8 UDPH_T;

#define UDPH_SPORT      0                 /* source port number, 2 bytes */
#define UDPH_DPORT      (UDPH_SPORT+2)    /* destination port number, 2 bytes */
#define UDPH_LENGTH     (UDPH_DPORT+2)    /* bytes in header + data, 2 bytes */
#define UDPH_CHECKSUM   (UDPH_LENGTH+2)   /* optional checksum, 2 bytes */

#define SIZEOF_UDPH_T   (UDPH_CHECKSUM+2)


#define UDP_ROUTE_PORT  520     /* the NIP socket number */

#define UDP_PSIZE       1472    /* Max. number of data bytes in a UDP packet */
#define UDP_MHR (sizeof(udph_t) + UDP_PSIZE)    /* max bytes in a UDP header + data */
#define UDP_MIN_FREE    771     /* see page(417) (was 256) */
                				/* Changed to 771 for Berkeley compatibility*/

#endif /*_UDP_*/