#ifndef	_IFACE_H
#define	_IFACE_H

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

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

#ifndef _PROC_H
#include "proc.h"
#endif

/* Interface encapsulation mode table entry. An array of these structures
 * are initialized in config.c with all of the information necessary
 * to attach a device.
 */
struct iftype {
	char *name;		/* Name of encapsulation technique */
	int (*send) __ARGS((struct mbuf *,struct iface *,int32,int));
				/* Routine to send an IP datagram */
	int (*output) __ARGS((struct iface *,char *,char *,int16,struct mbuf *));
				/* Routine to send link packet */
	char *(*format) __ARGS((char *,char *));
				/* Function that formats addresses */
	int (*scan) __ARGS((char *,char *));
				/* Reverse of format */
	int type;		/* Type field for network process */
	int hwalen;		/* Length of hardware address, if any */
};
#define	NULLIFT	(struct iftype *)0
extern struct iftype Iftypes[];


/* Interface control structure */
struct iface {
	struct iface *next;	/* Linked list pointer */
	char *name;		/* Ascii string with interface name */

	int32 addr;		/* IP address */
	int32 broadcast;	/* Broadcast address */
	int32 netmask;		/* Network mask */

	int16 mtu;		/* Maximum transmission unit size */

	int16 flags;		/* Configuration flags */
#define	DATAGRAM_MODE	0	/* Send datagrams in raw link frames */
#define	CONNECT_MODE	1	/* Send datagrams in connected mode */
	int16 trace;		/* Trace flags */
#define	IF_TRACE_OUT	0x01	/* Output packets */
#define	IF_TRACE_IN	0x10	/* Packets to me except broadcast */
#define	IF_TRACE_ASCII	0x100	/* Dump packets in ascii */
#define	IF_TRACE_HEX	0x200	/* Dump packets in hex/ascii */
#define	IF_TRACE_NOBC	0x1000	/* Suppress broadcasts */
#define	IF_TRACE_RAW	0x2000	/* Raw dump, if supported */
	char *trfile;		/* Trace file name, if any */
	FILE *trfp;		/* Stream to trace to */

	struct iface *forw;	/* Forwarding interface for output, if rx only */

	struct proc *rxproc;	/* Receiver process, if any */
	struct proc *txproc;	/* IP send process */
	struct proc *supv;	/* Supervisory process, if any */

	struct mbuf *outq;	/* IP datagram transmission queue */

	/* Device dependent */
	int dev;		/* Subdevice number to pass to send */
				/* To device -- control */
	int32 (*ioctl) __ARGS((struct iface *,int cmd,int set,int32 val));
				/* From device -- when status changes */
	int (*iostatus) __ARGS((struct iface *,int cmd,int32 val));
				/* Call before detaching */
	int (*stop) __ARGS((struct iface *));
	char *hwaddr;		/* Device hardware address, if any */

	/* Encapsulation dependent */
	void *edv;		/* Pointer to protocol extension block, if any */
	int type;		/* Link header type for phdr */
	int xdev;		/* Associated Slip or Nrs channel, if any */
	struct iftype *iftype;	/* Pointer to appropriate iftype entry */

				/* Routine to send an IP datagram */
	int (*send) __ARGS((struct mbuf *,struct iface *,int32,int));
			/* Encapsulate any link packet */
	int (*output) __ARGS((struct iface *,char *,char *,int16,struct mbuf *));
			/* Send raw packet */
	int (*raw)		__ARGS((struct iface *,struct mbuf *));
			/* Display status */
	void (*show)		__ARGS((struct iface *));

	int (*discard)		__ARGS((struct iface *,struct mbuf *));
	int (*echo)		__ARGS((struct iface *,struct mbuf *));

	/* Counters */
	int32 ipsndcnt; 	/* IP datagrams sent */
	int32 rawsndcnt;	/* Raw packets sent */
	int32 iprecvcnt;	/* IP datagrams received */
	int32 rawrecvcnt;	/* Raw packets received */
	int32 lastsent;		/* Clock time of last send */
	int32 lastrecv;		/* Clock time of last receive */
};
#define	NULLIF	(struct iface *)0
extern struct iface *Ifaces;	/* Head of interface list */
extern struct iface  Loopback;	/* Optional loopback interface */
extern struct iface  Encap;	/* IP-in-IP pseudo interface */

/* Header put on front of each packet in input queue */
struct phdr {
	struct iface *iface;
	unsigned short type;	/* Use pktdrvr "class" values */
};
/* Header put on front of each packet sent to an interface */
struct qhdr {
	char tos;
	int32 gateway;
};
/* List of link-level receive functions, initialized in config.c */
struct rfunc {
	int class;
	void (*rcvf) __ARGS((struct iface *,struct mbuf *));
};
extern struct rfunc Rfunc[];

extern char Noipaddr[];
extern struct mbuf *Hopper;

/* In iface.c: */
struct iface *if_lookup __ARGS((char *name));
struct iface *ismyaddr __ARGS((int32 addr));
int if_detach __ARGS((struct iface *ifp));
int setencap __ARGS((struct iface *ifp,char *mode));
char *if_name __ARGS((struct iface *ifp,char *comment));
int bitbucket __ARGS((struct iface *ifp,struct mbuf *bp));
void if_tx __ARGS((int dev,void *arg1,void *unused));
void network __ARGS((int i,void *v1,void *v2));

/* In config.c: */
int net_route __ARGS((struct iface *ifp,int type,struct mbuf *bp));

#endif	/* _IFACE_H */