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lapb.h
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C/C++ Source or Header
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1991-07-06
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5KB
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143 lines
#ifndef _LAPB_H
#define _LAPB_H
#ifndef _GLOBAL_H
#include "global.h"
#endif
#ifndef _MBUF_H
#include "mbuf.h"
#endif
#ifndef _IFACE_H
#include "iface.h"
#endif
#ifndef _TIMER_H
#include "timer.h"
#endif
#ifndef _AX25_H
#include "ax25.h"
#endif
/* Upper sub-layer (LAPB) definitions */
/* Control field templates */
#define I 0x00 /* Information frames */
#define S 0x01 /* Supervisory frames */
#define RR 0x01 /* Receiver ready */
#define RNR 0x05 /* Receiver not ready */
#define REJ 0x09 /* Reject */
#define U 0x03 /* Unnumbered frames */
#define SABM 0x2f /* Set Asynchronous Balanced Mode */
#define DISC 0x43 /* Disconnect */
#define DM 0x0f /* Disconnected mode */
#define UA 0x63 /* Unnumbered acknowledge */
#define FRMR 0x87 /* Frame reject */
#define UI 0x03 /* Unnumbered information */
#define PF 0x10 /* Poll/final bit */
#define MMASK 7 /* Mask for modulo-8 sequence numbers */
/* FRMR reason bits */
#define W 1 /* Invalid control field */
#define X 2 /* Unallowed I-field */
#define Y 4 /* Too-long I-field */
#define Z 8 /* Invalid sequence number */
/* Per-connection link control block
* These are created and destroyed dynamically,
* and are indexed through a hash table.
* One exists for each logical AX.25 Level 2 connection
*/
struct ax25_cb {
struct ax25_cb *next; /* Linked list pointers */
struct iface *iface; /* Interface */
struct mbuf *txq; /* Transmit queue */
struct mbuf *rxasm; /* Receive reassembly buffer */
struct mbuf *rxq; /* Receive queue */
char local[AXALEN]; /* Addresses */
char remote[AXALEN];
struct {
char rejsent; /* REJ frame has been sent */
char remotebusy; /* Remote sent RNR */
char rtt_run; /* Round trip "timer" is running */
char retrans; /* A retransmission has occurred */
char clone; /* Server-type cb, will be cloned */
} flags;
char reason; /* Reason for connection closing */
#define LB_NORMAL 0 /* Normal close */
#define LB_DM 1 /* Received DM from other end */
#define LB_TIMEOUT 2 /* Excessive retries */
#define LB_UNUSED 3 /* Link is redundant - unused */
char response; /* Response owed to other end */
char vs; /* Our send state variable */
char vr; /* Our receive state variable */
char unack; /* Number of unacked frames */
int maxframe; /* Transmit flow control level, frames */
int16 paclen; /* Maximum outbound packet size, bytes */
int16 window; /* Local flow control limit, bytes */
char proto; /* Protocol version */
#define V1 1 /* AX.25 Version 1 */
#define V2 2 /* AX.25 Version 2 */
int16 pthresh; /* Poll threshold, bytes */
unsigned retries; /* Retry counter */
unsigned n2; /* Retry limit */
int state; /* Link state */
#define LAPB_DISCONNECTED 1
#define LAPB_LISTEN 2
#define LAPB_SETUP 3
#define LAPB_DISCPENDING 4
#define LAPB_CONNECTED 5
#define LAPB_RECOVERY 6
struct timer t1; /* Retry timer */
struct timer t3; /* Keep-alive poll timer */
struct timer t4; /* Link redundancy timer */
int32 rtt_time; /* Stored clock values for RTT, ticks */
int rtt_seq; /* Sequence number being timed */
int32 srt; /* Smoothed round-trip time, ms */
int32 mdev; /* Mean rtt deviation, ms */
void (*r_upcall) __ARGS((struct ax25_cb *,int)); /* Receiver upcall */
void (*t_upcall) __ARGS((struct ax25_cb *,int)); /* Transmit upcall */
void (*s_upcall) __ARGS((struct ax25_cb *,int,int)); /* State change upcall */
int user; /* User pointer */
int segremain; /* Segmenter state */
};
#define NULLAX25 ((struct ax25_cb *)0)
extern struct ax25_cb Ax25default,*Ax25_cb;
extern char *Ax25states[],*Axreasons[];
extern int32 Axirtt,T3init,T4init,Blimit;
extern int16 N2,Maxframe,Paclen,Pthresh,Axwindow,Axversion;
/* In lapb.c: */
void est_link __ARGS((struct ax25_cb *axp));
void lapbstate __ARGS((struct ax25_cb *axp,int s));
int lapb_input __ARGS((struct ax25_cb *axp,int cmdrsp,struct mbuf *bp));
int lapb_output __ARGS((struct ax25_cb *axp));
struct mbuf *segmenter __ARGS((struct mbuf *bp,int16 ssize));
int sendctl __ARGS((struct ax25_cb *axp,int cmdrsp,int cmd));
/* In lapbtimer.c: */
void pollthem __ARGS((void *p));
void recover __ARGS((void *p));
void redundant __ARGS((void *p));
/* In ax25subr.c: */
int16 ftype __ARGS((int control));
void lapb_garbage __ARGS((int drastic));
/* In nr3.c: */
void nr_derate __ARGS(( struct ax25_cb *axp));
#endif /* _LAPB_H */