#ifndef	_AX25_H
#define	_AX25_H

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

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

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

/* AX.25 datagram (address) sub-layer definitions */

#define	NHASH		17	/* Number of hash chains in AX.25 routing
				 * tables, LAPB control blocks and link
				 * status tables
				 */
#define	MAXDIGIS	7	/* Maximum number of digipeaters */
#define	ALEN		6	/* Number of chars in callsign field */
#define	AXALEN		7	/* Total AX.25 address length, including SSID */
#define	AXBUF		10	/* Buffer size for maximum-length ascii call */

#ifndef _LAPB_H
#include "lapb.h"
#endif

/* Bits within SSID field of AX.25 address */
#define	SSID		0x1e	/* Sub station ID */
#define	REPEATED	0x80	/* Has-been-repeated bit in repeater field */
#define	E		0x01	/* Address extension bit */
#define	C		0x80	/* Command/response designation */
/* Our AX.25 address */
extern char Mycall[AXALEN];

/* AX.25 broadcast address: "QST   -0" in shifted ASCII */
extern char Ax25_bdcst[AXALEN];

extern int Digipeat;
extern int Ax25mbox;

/* Internal representation of an AX.25 header */
struct ax25 {
	char dest[AXALEN];		/* Destination address */
	char source[AXALEN];		/* Source address */
	char digis[MAXDIGIS][AXALEN];	/* Digi string */
	int ndigis;			/* Number of digipeaters */
	int nextdigi;			/* Index to next digi in chain */
	int cmdrsp;			/* Command/response */
};

/* C-bit stuff */
#define	LAPB_UNKNOWN		0
#define	LAPB_COMMAND		1
#define	LAPB_RESPONSE		2

/* AX.25 routing table entry */
struct ax_route {
	struct ax_route *prev;		/* Linked list pointers */
	struct ax_route *next;
	char target[AXALEN];
	char digis[MAXDIGIS][AXALEN];
	int ndigis;
	char type;
#define	AX_LOCAL	1		/* Set by local ax25 route command */
#define	AX_AUTO		2		/* Set by incoming packet */
};
#define NULLAXR	((struct ax_route *)0)

extern struct ax_route *Ax_routes[NHASH];
extern struct ax_route Ax_default;

/* AX.25 Level 3 Protocol IDs (PIDs) */
#define PID_X25		0x01	/* CCITT X.25 PLP */
#define	PID_SEGMENT	0x08	/* Segmentation fragment */
#define PID_TEXNET	0xc3	/* TEXNET datagram protocol */
#define	PID_LQ		0xc4	/* Link quality protocol */
#define	PID_APPLETALK	0xca	/* Appletalk */
#define	PID_APPLEARP	0xcb	/* Appletalk ARP */
#define	PID_IP		0xcc	/* ARPA Internet Protocol */
#define	PID_ARP		0xcd	/* ARPA Address Resolution Protocol */
#define	PID_NETROM	0xcf	/* NET/ROM */
#define	PID_NO_L3	0xf0	/* No level 3 protocol */

#define	SEG_FIRST	0x80	/* First segment of a sequence */
#define	SEG_REM		0x7f	/* Mask for # segments remaining */

#define	AX_EOL		"\r"	/* AX.25 end-of-line convention */

/* Link quality report packet header, internal format */
struct lqhdr {
	int16 version;		/* Version number of protocol */
#define	LINKVERS	1
	int32	ip_addr;	/* Sending station's IP address */
};
#define	LQHDR	6
/* Link quality entry, internal format */
struct lqentry {
	char addr[AXALEN];	/* Address of heard station */
	int32 count;		/* Count of packets heard from that station */
};
#define	LQENTRY	11

/* Link quality database record format
 * Currently used only by AX.25 interfaces
 */
struct lq {
	struct lq *prev;	/* Linked list pointers */
	struct lq *next;

	struct iface *iface;	/* Interface address was heard on */

	/* Time station was last heard */
	int32 time;

	/* # of packets heard from this station as of his last update */
	int32 lastrxcnt;

	/* Current # of packets heard from this station */
	int32 currxcnt;

	/* # packets reported as transmitted by station as of his last update */
	int32 lasttxcnt;

	int16 hisqual;	/* Fraction (0-1000) of station's packets heard
			 * as of last update
			 */
	int16 myqual;	/* Fraction (0-1000) of our packets heard by station
			 * as of last update
			 */
	char *addr;	/* Hardware address of station heard */
};
#define	NULLLQ	(struct lq *)0

extern struct lq *Lq[NHASH];	/* Link quality record headers */

/* Linkage to network protocols atop ax25 */
struct axlink {
	int pid;
	void (*funct) __ARGS((struct iface *,struct ax25_cb *,char *, char *,
	 struct mbuf *,int));
};
extern struct axlink Axlink[];

/* List of AX.25 multicast addresses */
extern char *Axmulti[];

/* Codes for the open_ax25 call */
#define	AX_PASSIVE	0
#define	AX_ACTIVE	1
#define	AX_SERVER	2	/* Passive, clone on opening */

/* In ax25.c: */
struct ax_route *ax_add __ARGS((char *,int,char digis[][AXALEN],int));
int ax_drop __ARGS((char *));
struct ax_route *ax_lookup __ARGS((char *));
void ax_recv __ARGS((struct iface *,struct mbuf *));
int ax_send __ARGS((struct mbuf *bp,struct iface *iface,int32 gateway,int prec,
	int del,int tput,int rel));
int ax_output __ARGS((struct iface *iface,char *dest,char *source,int16 pid,
	struct mbuf *data));
int sendframe __ARGS((struct ax25_cb *axp,int cmdrsp,int ctl,struct mbuf *data));
void axnl3 __ARGS((struct iface *iface,struct ax25_cb *axp,char *src,
	char *dest,struct mbuf *bp,int mcast));

/* In ax25cmd.c: */
void st_ax25 __ARGS((struct ax25_cb *axp));

/* In axhdr.c: */
struct mbuf *htonax25 __ARGS((struct ax25 *hdr,struct mbuf *data));
int ntohax25 __ARGS((struct ax25 *hdr,struct mbuf **bpp));

/* In axlink.c: */
void getlqentry __ARGS((struct lqentry *ep,struct mbuf **bpp));
void getlqhdr __ARGS((struct lqhdr *hp,struct mbuf **bpp));
void logaddr __ARGS((struct iface *iface,char *addr));
char *putlqentry __ARGS((char *cp,char *addr,int32 count));
char *putlqhdr __ARGS((char *cp,int16 version,int32 ip_addr));

/* In ax25user.c: */
int ax25val __ARGS((struct ax25_cb *axp));
int disc_ax25 __ARGS((struct ax25_cb *axp));
int kick_ax25 __ARGS((struct ax25_cb *axp));
struct ax25_cb *open_ax25 __ARGS((struct iface *,char *,char *,
	int,int16,
	void (*) __ARGS((struct ax25_cb *,int)),
	void (*) __ARGS((struct ax25_cb *,int)),
	void (*) __ARGS((struct ax25_cb *,int,int)),
	int user));
struct mbuf *recv_ax25 __ARGS((struct ax25_cb *axp,int16 cnt));
int reset_ax25 __ARGS((struct ax25_cb *axp));
int send_ax25 __ARGS((struct ax25_cb *axp,struct mbuf *bp,int pid));

/* In ax25subr.c: */
int addreq __ARGS((char *a,char *b));
int16 ax25hash __ARGS((char *s));
struct ax25_cb *cr_ax25 __ARGS((char *addr));
void del_ax25 __ARGS((struct ax25_cb *axp));
struct ax25_cb *find_ax25 __ARGS((char *));
char *pax25 __ARGS((char *e,char *addr));
int setcall __ARGS((char *out,char *call));

/* In socket.c: */
void beac_input __ARGS((struct iface *iface,char *src,struct mbuf *bp));
void s_arcall __ARGS((struct ax25_cb *axp,int cnt));
void s_ascall __ARGS((struct ax25_cb *axp,int old,int new));
void s_atcall __ARGS((struct ax25_cb *axp,int cnt));

#endif	/* _AX25_H */