#ifndef	_UDP_H
#define	_UDP_H

#ifndef	_GLOBAL_H
#include "global.h"
#endif

#ifndef	_MBUF_H
#include "mbuf.h"
#endif

#ifndef	_IFACE_H
#include "iface.h"
#endif

#ifndef	_INTERNET_H
#include "internet.h"
#endif

#ifndef _IP_H
#include "ip.h"
#endif

#ifndef	_NETUSER_H
#include "netuser.h"
#endif

/* SNMP MIB variables, used for statistics and control. See RFC 1066 */
extern struct mib_entry Udp_mib[];
#define	udpInDatagrams	Udp_mib[1].value.integer
#define	udpNoPorts	Udp_mib[2].value.integer
#define	udpInErrors	Udp_mib[3].value.integer
#define	udpOutDatagrams	Udp_mib[4].value.integer
#define	NUMUDPMIB	4

/* User Datagram Protocol definitions */
#define	NUDP	20

/* Structure of a UDP protocol header */
struct udp {
	int16 source;	/* Source port */
	int16 dest;	/* Destination port */
	int16 length;	/* Length of header and data */
	int16 checksum;	/* Checksum over pseudo-header, header and data */
};
#define	UDPHDR	8	/* Length of UDP header */

/* User Datagram Protocol control block
 * Each entry on the receive queue consists of the
 * remote socket structure, followed by any data
 */
struct udp_cb {
	struct udp_cb *prev;	/* Linked list pointers */
	struct udp_cb *next;
	struct socket socket;	/* Local port accepting datagrams */
	void (*r_upcall) __ARGS((struct iface *iface,struct udp_cb *,int));
				/* Function to call when one arrives */
	struct mbuf *rcvq;	/* Queue of pending datagrams */
	int rcvcnt;		/* Count of pending datagrams */
	int user;		/* User link */
};
extern struct udp_cb *Udps[];	/* Hash table for UDP structures */
#define	NULLUDP	(struct udp_cb *)0

/* UDP primitives */

/* In udp.c: */
int del_udp __ARGS((struct udp_cb *up));
struct udp_cb *open_udp __ARGS((struct socket *lsocket,
	void (*r_upcall) __ARGS((struct iface *iface,struct udp_cb *,int))));
int recv_udp __ARGS((struct udp_cb *up,struct socket *fsocket,struct mbuf **bp));
int send_udp __ARGS((struct socket *lsocket,struct socket *fsocket,char tos,
	char ttl,struct mbuf *data,int16 length,int16 id,char df));
void udp_input __ARGS((struct iface *iface,struct ip *ip,struct mbuf *bp,
	int rxbroadcast));
void udp_garbage __ARGS((int drastic));

#ifdef HOPCHECK
void udp_icmp __ARGS((int32 icsource, int32 ipsource,int32 ipdest,
	char ictype,char iccode,struct mbuf **bpp));
/* In hop.c: */
void hop_icmp __ARGS((struct udp_cb *ucb, int32 icsource, int32 ipdest,
	int16 udpdest, char ictype, char iccode));
#endif

/* In udpcmd.c: */
int st_udp __ARGS((struct udp_cb *udp,int n));

/* In udphdr.c: */
struct mbuf *htonudp __ARGS((struct udp *udp,struct mbuf *data,struct pseudo_header *ph));
int ntohudp __ARGS((struct udp *udp,struct mbuf **bpp));

#endif	/* _UDP_H */