linux/include/net/lapb.h
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   1#ifndef _LAPB_H
   2#define _LAPB_H 
   3#include <linux/lapb.h>
   4
   5#define LAPB_HEADER_LEN 20              /* LAPB over Ethernet + a bit more */
   6
   7#define LAPB_ACK_PENDING_CONDITION      0x01
   8#define LAPB_REJECT_CONDITION           0x02
   9#define LAPB_PEER_RX_BUSY_CONDITION     0x04
  10
  11/* Control field templates */
  12#define LAPB_I          0x00    /* Information frames */
  13#define LAPB_S          0x01    /* Supervisory frames */
  14#define LAPB_U          0x03    /* Unnumbered frames */
  15
  16#define LAPB_RR         0x01    /* Receiver ready */
  17#define LAPB_RNR        0x05    /* Receiver not ready */
  18#define LAPB_REJ        0x09    /* Reject */
  19
  20#define LAPB_SABM       0x2F    /* Set Asynchronous Balanced Mode */
  21#define LAPB_SABME      0x6F    /* Set Asynchronous Balanced Mode Extended */
  22#define LAPB_DISC       0x43    /* Disconnect */
  23#define LAPB_DM         0x0F    /* Disconnected mode */
  24#define LAPB_UA         0x63    /* Unnumbered acknowledge */
  25#define LAPB_FRMR       0x87    /* Frame reject */
  26
  27#define LAPB_ILLEGAL    0x100   /* Impossible to be a real frame type */
  28
  29#define LAPB_SPF        0x10    /* Poll/final bit for standard LAPB */
  30#define LAPB_EPF        0x01    /* Poll/final bit for extended LAPB */
  31
  32#define LAPB_FRMR_W     0x01    /* Control field invalid        */
  33#define LAPB_FRMR_X     0x02    /* I field invalid              */
  34#define LAPB_FRMR_Y     0x04    /* I field too long             */
  35#define LAPB_FRMR_Z     0x08    /* Invalid N(R)                 */
  36
  37#define LAPB_POLLOFF    0
  38#define LAPB_POLLON     1
  39
  40/* LAPB C-bit */
  41#define LAPB_COMMAND    1
  42#define LAPB_RESPONSE   2
  43
  44#define LAPB_ADDR_A     0x03
  45#define LAPB_ADDR_B     0x01
  46#define LAPB_ADDR_C     0x0F
  47#define LAPB_ADDR_D     0x07
  48
  49/* Define Link State constants. */
  50enum {
  51        LAPB_STATE_0,   /* Disconnected State           */
  52        LAPB_STATE_1,   /* Awaiting Connection State    */
  53        LAPB_STATE_2,   /* Awaiting Disconnection State */
  54        LAPB_STATE_3,   /* Data Transfer State          */
  55        LAPB_STATE_4    /* Frame Reject State           */
  56};
  57
  58#define LAPB_DEFAULT_MODE               (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
  59#define LAPB_DEFAULT_WINDOW             7               /* Window=7 */
  60#define LAPB_DEFAULT_T1                 (5 * HZ)        /* T1=5s    */
  61#define LAPB_DEFAULT_T2                 (1 * HZ)        /* T2=1s    */
  62#define LAPB_DEFAULT_N2                 20              /* N2=20    */
  63
  64#define LAPB_SMODULUS   8
  65#define LAPB_EMODULUS   128
  66
  67/*
  68 *      Information about the current frame.
  69 */
  70struct lapb_frame {
  71        unsigned short          type;           /* Parsed type          */
  72        unsigned short          nr, ns;         /* N(R), N(S)           */
  73        unsigned char           cr;             /* Command/Response     */
  74        unsigned char           pf;             /* Poll/Final           */
  75        unsigned char           control[2];     /* Original control data*/
  76};
  77
  78/*
  79 *      The per LAPB connection control structure.
  80 */
  81struct lapb_cb {
  82        struct list_head        node;
  83        struct net_device       *dev;
  84
  85        /* Link status fields */
  86        unsigned int            mode;
  87        unsigned char           state;
  88        unsigned short          vs, vr, va;
  89        unsigned char           condition;
  90        unsigned short          n2, n2count;
  91        unsigned short          t1, t2;
  92        struct timer_list       t1timer, t2timer;
  93
  94        /* Internal control information */
  95        struct sk_buff_head     write_queue;
  96        struct sk_buff_head     ack_queue;
  97        unsigned char           window;
  98        const struct lapb_register_struct *callbacks;
  99
 100        /* FRMR control information */
 101        struct lapb_frame       frmr_data;
 102        unsigned char           frmr_type;
 103
 104        atomic_t                refcnt;
 105};
 106
 107/* lapb_iface.c */
 108extern void lapb_connect_confirmation(struct lapb_cb *lapb, int);
 109extern void lapb_connect_indication(struct lapb_cb *lapb, int);
 110extern void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
 111extern void lapb_disconnect_indication(struct lapb_cb *lapb, int);
 112extern int  lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
 113extern int  lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
 114
 115/* lapb_in.c */
 116extern void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
 117
 118/* lapb_out.c */
 119extern void lapb_kick(struct lapb_cb *lapb);
 120extern void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
 121extern void lapb_establish_data_link(struct lapb_cb *lapb);
 122extern void lapb_enquiry_response(struct lapb_cb *lapb);
 123extern void lapb_timeout_response(struct lapb_cb *lapb);
 124extern void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
 125extern void lapb_check_need_response(struct lapb_cb *lapb, int, int);
 126
 127/* lapb_subr.c */
 128extern void lapb_clear_queues(struct lapb_cb *lapb);
 129extern void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
 130extern void lapb_requeue_frames(struct lapb_cb *lapb);
 131extern int  lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
 132extern int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
 133extern void lapb_send_control(struct lapb_cb *lapb, int, int, int);
 134extern void lapb_transmit_frmr(struct lapb_cb *lapb);
 135
 136/* lapb_timer.c */
 137extern void lapb_start_t1timer(struct lapb_cb *lapb);
 138extern void lapb_start_t2timer(struct lapb_cb *lapb);
 139extern void lapb_stop_t1timer(struct lapb_cb *lapb);
 140extern void lapb_stop_t2timer(struct lapb_cb *lapb);
 141extern int  lapb_t1timer_running(struct lapb_cb *lapb);
 142
 143/*
 144 * Debug levels.
 145 *      0 = Off
 146 *      1 = State Changes
 147 *      2 = Packets I/O and State Changes
 148 *      3 = Hex dumps, Packets I/O and State Changes.
 149 */
 150#define LAPB_DEBUG      0
 151
 152#define lapb_dbg(level, fmt, ...)                       \
 153do {                                                    \
 154        if (level < LAPB_DEBUG)                         \
 155                pr_debug(fmt, ##__VA_ARGS__);           \
 156} while (0)
 157
 158#endif
 159
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