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 */ 81typedef 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 */ 106extern void lapb_connect_confirmation(lapb_cb *, int); 107extern void lapb_connect_indication(lapb_cb *, int); 108extern void lapb_disconnect_confirmation(lapb_cb *, int); 109extern void lapb_disconnect_indication(lapb_cb *, int); 110extern int lapb_data_indication(lapb_cb *, struct sk_buff *); 111extern int lapb_data_transmit(lapb_cb *, struct sk_buff *); 112 113/* lapb_in.c */ 114extern void lapb_data_input(lapb_cb *, struct sk_buff *); 115 116/* lapb_out.c */ 117extern void lapb_kick(lapb_cb *); 118extern void lapb_transmit_buffer(lapb_cb *, struct sk_buff *, int); 119extern void lapb_establish_data_link(lapb_cb *); 120extern void lapb_enquiry_response(lapb_cb *); 121extern void lapb_timeout_response(lapb_cb *); 122extern void lapb_check_iframes_acked(lapb_cb *, unsigned short); 123extern void lapb_check_need_response(lapb_cb *, int, int); 124 125/* lapb_subr.c */ 126extern void lapb_clear_queues(lapb_cb *); 127extern void lapb_frames_acked(lapb_cb *, unsigned short); 128extern void lapb_requeue_frames(lapb_cb *); 129extern int lapb_validate_nr(lapb_cb *, unsigned short); 130extern void lapb_decode(lapb_cb *, struct sk_buff *, struct lapb_frame *); 131extern void lapb_send_control(lapb_cb *, int, int, int); 132extern void lapb_transmit_frmr(lapb_cb *); 133 134/* lapb_timer.c */ 135extern void lapb_start_t1timer(lapb_cb *); 136extern void lapb_start_t2timer(lapb_cb *); 137extern void lapb_stop_t1timer(lapb_cb *); 138extern void lapb_stop_t2timer(lapb_cb *); 139extern 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 151