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 struct 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 */ 108 extern void lapb_connect_confirmation(struct lapb_cb *lapb, int); 109 extern void lapb_connect_indication(struct lapb_cb *lapb, int); 110 extern void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); 111 extern void lapb_disconnect_indication(struct lapb_cb *lapb, int); 112 extern int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); 113 extern int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); 114 115 /* lapb_in.c */ 116 extern void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); 117 118 /* lapb_out.c */ 119 extern void lapb_kick(struct lapb_cb *lapb); 120 extern void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); 121 extern void lapb_establish_data_link(struct lapb_cb *lapb); 122 extern void lapb_enquiry_response(struct lapb_cb *lapb); 123 extern void lapb_timeout_response(struct lapb_cb *lapb); 124 extern void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); 125 extern void lapb_check_need_response(struct lapb_cb *lapb, int, int); 126 127 /* lapb_subr.c */ 128 extern void lapb_clear_queues(struct lapb_cb *lapb); 129 extern void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); 130 extern void lapb_requeue_frames(struct lapb_cb *lapb); 131 extern int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); 132 extern int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); 133 extern void lapb_send_control(struct lapb_cb *lapb, int, int, int); 134 extern void lapb_transmit_frmr(struct lapb_cb *lapb); 135 136 /* lapb_timer.c */ 137 extern void lapb_start_t1timer(struct lapb_cb *lapb); 138 extern void lapb_start_t2timer(struct lapb_cb *lapb); 139 extern void lapb_stop_t1timer(struct lapb_cb *lapb); 140 extern void lapb_stop_t2timer(struct lapb_cb *lapb); 141 extern 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 #endif 153