i386/linux-2.3.21/include/net/lapb.h

   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. */
  50 enum {
  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  */
  70 struct 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  */
  81 typedef struct lapb_cb {
  82         struct lapb_cb          *next;
  83         void                    *token;
  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         struct lapb_register_struct callbacks;
  99
 100         /* FRMR control information */
 101         struct lapb_frame       frmr_data;
 102         unsigned char           frmr_type;
 103 } lapb_cb;
 104
 105 /* lapb_iface.c */
 106 extern void lapb_connect_confirmation(lapb_cb *, int);
 107 extern void lapb_connect_indication(lapb_cb *, int);
 108 extern void lapb_disconnect_confirmation(lapb_cb *, int);
 109 extern void lapb_disconnect_indication(lapb_cb *, int);
 110 extern int  lapb_data_indication(lapb_cb *, struct sk_buff *);
 111 extern int  lapb_data_transmit(lapb_cb *, struct sk_buff *);
 112
 113 /* lapb_in.c */
 114 extern void lapb_data_input(lapb_cb *, struct sk_buff *);
 115
 116 /* lapb_out.c */
 117 extern void lapb_kick(lapb_cb *);
 118 extern void lapb_transmit_buffer(lapb_cb *, struct sk_buff *, int);
 119 extern void lapb_establish_data_link(lapb_cb *);
 120 extern void lapb_enquiry_response(lapb_cb *);
 121 extern void lapb_timeout_response(lapb_cb *);
 122 extern void lapb_check_iframes_acked(lapb_cb *, unsigned short);
 123 extern void lapb_check_need_response(lapb_cb *, int, int);
 124
 125 /* lapb_subr.c */
 126 extern void lapb_clear_queues(lapb_cb *);
 127 extern void lapb_frames_acked(lapb_cb *, unsigned short);
 128 extern void lapb_requeue_frames(lapb_cb *);
 129 extern int  lapb_validate_nr(lapb_cb *, unsigned short);
 130 extern void lapb_decode(lapb_cb *, struct sk_buff *, struct lapb_frame *);
 131 extern void lapb_send_control(lapb_cb *, int, int, int);
 132 extern void lapb_transmit_frmr(lapb_cb *);
 133
 134 /* lapb_timer.c */
 135 extern void lapb_start_t1timer(lapb_cb *);
 136 extern void lapb_start_t2timer(lapb_cb *);
 137 extern void lapb_stop_t1timer(lapb_cb *);
 138 extern void lapb_stop_t2timer(lapb_cb *);
 139 extern int  lapb_t1timer_running(lapb_cb *);
 140
 141 /*
 142  * Debug levels.
 143  *      0 = Off
 144  *      1 = State Changes
 145  *      2 = Packets I/O and State Changes
 146  *      3 = Hex dumps, Packets I/O and State Changes.
 147  */
 148 #define LAPB_DEBUG      0
 149
 150 #endif