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#ifndef _LAPB_H

#define _LAPB_H 

#include <linux/lapb.h>

#define LAPB_HEADER_LEN 20              /* LAPB over Ethernet + a bit more */

#define LAPB_ACK_PENDING_CONDITION      0x01

#define LAPB_REJECT_CONDITION           0x02

#define LAPB_PEER_RX_BUSY_CONDITION     0x04

/* Control field templates */

#define LAPB_I          0x00    /* Information frames */

#define LAPB_S          0x01    /* Supervisory frames */

#define LAPB_U          0x03    /* Unnumbered frames */

#define LAPB_RR         0x01    /* Receiver ready */

#define LAPB_RNR        0x05    /* Receiver not ready */

#define LAPB_REJ        0x09    /* Reject */

#define LAPB_SABM       0x2F    /* Set Asynchronous Balanced Mode */

#define LAPB_SABME      0x6F    /* Set Asynchronous Balanced Mode Extended */

#define LAPB_DISC       0x43    /* Disconnect */

#define LAPB_DM         0x0F    /* Disconnected mode */

#define LAPB_UA         0x63    /* Unnumbered acknowledge */

#define LAPB_FRMR       0x87    /* Frame reject */

#define LAPB_ILLEGAL    0x100   /* Impossible to be a real frame type */

#define LAPB_SPF        0x10    /* Poll/final bit for standard LAPB */

#define LAPB_EPF        0x01    /* Poll/final bit for extended LAPB */

#define LAPB_FRMR_W     0x01    /* Control field invalid        */

#define LAPB_FRMR_X     0x02    /* I field invalid              */

#define LAPB_FRMR_Y     0x04    /* I field too long             */

#define LAPB_FRMR_Z     0x08    /* Invalid N(R)                 */

#define LAPB_POLLOFF    0

#define LAPB_POLLON     1

/* LAPB C-bit */

#define LAPB_COMMAND    1

#define LAPB_RESPONSE   2

#define LAPB_ADDR_A     0x03

#define LAPB_ADDR_B     0x01

#define LAPB_ADDR_C     0x0F

#define LAPB_ADDR_D     0x07

/* Define Link State constants. */

enum {

        LAPB_STATE_0,   /* Disconnected State           */

        LAPB_STATE_1,   /* Awaiting Connection State    */

        LAPB_STATE_2,   /* Awaiting Disconnection State */

        LAPB_STATE_3,   /* Data Transfer State          */

        LAPB_STATE_4    /* Frame Reject State           */

};

#define LAPB_DEFAULT_MODE               (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)

#define LAPB_DEFAULT_WINDOW             7               /* Window=7 */

#define LAPB_DEFAULT_T1                 (5 * HZ)        /* T1=5s    */

#define LAPB_DEFAULT_T2                 (1 * HZ)        /* T2=1s    */

#define LAPB_DEFAULT_N2                 20              /* N2=20    */

#define LAPB_SMODULUS   8

#define LAPB_EMODULUS   128

/*

 *      Information about the current frame.

 */

struct lapb_frame {

        unsigned short          type;           /* Parsed type          */

        unsigned short          nr, ns;         /* N(R), N(S)           */

        unsigned char           cr;             /* Command/Response     */

        unsigned char           pf;             /* Poll/Final           */

        unsigned char           control[2];     /* Original control data*/

};

/*

 *      The per LAPB connection control structure.

 */

typedef struct lapb_cb {

        struct lapb_cb          *next;

        void                    *token;

        /* Link status fields */

        unsigned int            mode;

        unsigned char           state;

        unsigned short          vs, vr, va;

        unsigned char           condition;

        unsigned short          n2, n2count;

        unsigned short          t1, t2;

        struct timer_list       t1timer, t2timer;

        /* Internal control information */

        struct sk_buff_head     write_queue;

        struct sk_buff_head     ack_queue;

        unsigned char           window;

        struct lapb_register_struct callbacks;

        /* FRMR control information */

        struct lapb_frame       frmr_data;

        unsigned char           frmr_type;

} lapb_cb;

/* lapb_iface.c */

extern void lapb_connect_confirmation(lapb_cb *, int);

extern void lapb_connect_indication(lapb_cb *, int);

extern void lapb_disconnect_confirmation(lapb_cb *, int);

extern void lapb_disconnect_indication(lapb_cb *, int);

extern int  lapb_data_indication(lapb_cb *, struct sk_buff *);

extern int  lapb_data_transmit(lapb_cb *, struct sk_buff *);

/* lapb_in.c */

extern void lapb_data_input(lapb_cb *, struct sk_buff *);

/* lapb_out.c */

extern void lapb_kick(lapb_cb *);

extern void lapb_transmit_buffer(lapb_cb *, struct sk_buff *, int);

extern void lapb_establish_data_link(lapb_cb *);

extern void lapb_enquiry_response(lapb_cb *);

extern void lapb_timeout_response(lapb_cb *);

extern void lapb_check_iframes_acked(lapb_cb *, unsigned short);

extern void lapb_check_need_response(lapb_cb *, int, int);

/* lapb_subr.c */

extern void lapb_clear_queues(lapb_cb *);

extern void lapb_frames_acked(lapb_cb *, unsigned short);

extern void lapb_requeue_frames(lapb_cb *);

extern int  lapb_validate_nr(lapb_cb *, unsigned short);

extern void lapb_decode(lapb_cb *, struct sk_buff *, struct lapb_frame *);

extern void lapb_send_control(lapb_cb *, int, int, int);

extern void lapb_transmit_frmr(lapb_cb *);

/* lapb_timer.c */

extern void lapb_start_t1timer(lapb_cb *);

extern void lapb_start_t2timer(lapb_cb *);

extern void lapb_stop_t1timer(lapb_cb *);

extern void lapb_stop_t2timer(lapb_cb *);

extern int  lapb_t1timer_running(lapb_cb *);

/*

 * Debug levels.

 *      0 = Off

 *      1 = State Changes

 *      2 = Packets I/O and State Changes

 *      3 = Hex dumps, Packets I/O and State Changes.

 */

#define LAPB_DEBUG      0

#endif