udp.h

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/*
 * File:		udp.h
 * Purpose:		User Datagram Protocol, UDP, data definitions
 *
 * Notes:
 *
 * Author:		Eric DeVolder
 * Date:		3-26-96
 *
 * Modifications:
 *
 */

#ifndef _UDP_H
#define _UDP_H

/********************************************************************/

typedef struct
{
	uint16		src_port;
	uint16		dest_port;
	uint16		length;
	uint16		chksum;
} udp_frame_hdr;

#define UDP_SOURCE(a)		(a->src_port)
#define UDP_DEST(a)			(a->dest_port)
#define UDP_LENGTH(a)		(a->length)
#define UDP_CHKSUM(a)		(a->chksum)

#define DEFAULT_UDP_PORT	(0x4321)
#define UDP_PORT_TELNET		(23)
#define UDP_PORT_FTP		(21)
#define UDP_PORT_TFTP		(69)

/* Protocol Header information */
#define UDP_HDR_OFFSET		(ETH_HDR_SIZE + IP_HDR_SIZE)
#define UDP_HDR_SIZE		8


/********************************************************************/

void
udp_init (void);

void
udp_prime_port (uint16);

uint16
udp_obtain_free_port (void);

void
udp_bind_port ( uint16, void (*)(NIF *,NBUF *,int));

void
udp_free_port (uint16);

int
udp_send (NIF *, uint8 *, int, int, NBUF *);

void
udp_handler (NIF *, NBUF *, int);

/********************************************************************/

#endif 	/* _UDP_H */