153 строки
4.7 KiB
C
153 строки
4.7 KiB
C
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#ifndef _LAPB_H
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#define _LAPB_H
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#include <linux/lapb.h>
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#define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
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#define LAPB_ACK_PENDING_CONDITION 0x01
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#define LAPB_REJECT_CONDITION 0x02
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#define LAPB_PEER_RX_BUSY_CONDITION 0x04
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/* Control field templates */
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#define LAPB_I 0x00 /* Information frames */
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#define LAPB_S 0x01 /* Supervisory frames */
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#define LAPB_U 0x03 /* Unnumbered frames */
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#define LAPB_RR 0x01 /* Receiver ready */
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#define LAPB_RNR 0x05 /* Receiver not ready */
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#define LAPB_REJ 0x09 /* Reject */
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#define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
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#define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
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#define LAPB_DISC 0x43 /* Disconnect */
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#define LAPB_DM 0x0F /* Disconnected mode */
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#define LAPB_UA 0x63 /* Unnumbered acknowledge */
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#define LAPB_FRMR 0x87 /* Frame reject */
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#define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
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#define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
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#define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
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#define LAPB_FRMR_W 0x01 /* Control field invalid */
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#define LAPB_FRMR_X 0x02 /* I field invalid */
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#define LAPB_FRMR_Y 0x04 /* I field too long */
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#define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
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#define LAPB_POLLOFF 0
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#define LAPB_POLLON 1
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/* LAPB C-bit */
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#define LAPB_COMMAND 1
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#define LAPB_RESPONSE 2
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#define LAPB_ADDR_A 0x03
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#define LAPB_ADDR_B 0x01
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#define LAPB_ADDR_C 0x0F
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#define LAPB_ADDR_D 0x07
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/* Define Link State constants. */
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enum {
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LAPB_STATE_0, /* Disconnected State */
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LAPB_STATE_1, /* Awaiting Connection State */
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LAPB_STATE_2, /* Awaiting Disconnection State */
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LAPB_STATE_3, /* Data Transfer State */
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LAPB_STATE_4 /* Frame Reject State */
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};
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#define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
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#define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
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#define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
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#define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
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#define LAPB_DEFAULT_N2 20 /* N2=20 */
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#define LAPB_SMODULUS 8
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#define LAPB_EMODULUS 128
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/*
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* Information about the current frame.
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*/
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struct lapb_frame {
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unsigned short type; /* Parsed type */
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unsigned short nr, ns; /* N(R), N(S) */
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unsigned char cr; /* Command/Response */
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unsigned char pf; /* Poll/Final */
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unsigned char control[2]; /* Original control data*/
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};
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/*
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* The per LAPB connection control structure.
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*/
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struct lapb_cb {
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struct list_head node;
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struct net_device *dev;
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/* Link status fields */
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unsigned int mode;
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unsigned char state;
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unsigned short vs, vr, va;
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unsigned char condition;
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unsigned short n2, n2count;
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unsigned short t1, t2;
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struct timer_list t1timer, t2timer;
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/* Internal control information */
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struct sk_buff_head write_queue;
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struct sk_buff_head ack_queue;
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unsigned char window;
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struct lapb_register_struct callbacks;
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/* FRMR control information */
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struct lapb_frame frmr_data;
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unsigned char frmr_type;
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atomic_t refcnt;
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};
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/* lapb_iface.c */
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extern void lapb_connect_confirmation(struct lapb_cb *lapb, int);
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extern void lapb_connect_indication(struct lapb_cb *lapb, int);
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extern void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
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extern void lapb_disconnect_indication(struct lapb_cb *lapb, int);
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extern int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
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extern int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
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/* lapb_in.c */
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extern void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
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/* lapb_out.c */
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extern void lapb_kick(struct lapb_cb *lapb);
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extern void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
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extern void lapb_establish_data_link(struct lapb_cb *lapb);
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extern void lapb_enquiry_response(struct lapb_cb *lapb);
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extern void lapb_timeout_response(struct lapb_cb *lapb);
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extern void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
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extern void lapb_check_need_response(struct lapb_cb *lapb, int, int);
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/* lapb_subr.c */
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extern void lapb_clear_queues(struct lapb_cb *lapb);
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extern void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
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extern void lapb_requeue_frames(struct lapb_cb *lapb);
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extern int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
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extern int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
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extern void lapb_send_control(struct lapb_cb *lapb, int, int, int);
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extern void lapb_transmit_frmr(struct lapb_cb *lapb);
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/* lapb_timer.c */
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extern void lapb_start_t1timer(struct lapb_cb *lapb);
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extern void lapb_start_t2timer(struct lapb_cb *lapb);
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extern void lapb_stop_t1timer(struct lapb_cb *lapb);
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extern void lapb_stop_t2timer(struct lapb_cb *lapb);
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extern int lapb_t1timer_running(struct lapb_cb *lapb);
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/*
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* Debug levels.
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* 0 = Off
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* 1 = State Changes
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* 2 = Packets I/O and State Changes
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* 3 = Hex dumps, Packets I/O and State Changes.
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*/
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#define LAPB_DEBUG 0
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#endif
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