lapb.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:4k
- #ifndef _LAPB_H
- #define _LAPB_H
- #include <linux/lapb.h>
- #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
- #define LAPB_ACK_PENDING_CONDITION 0x01
- #define LAPB_REJECT_CONDITION 0x02
- #define LAPB_PEER_RX_BUSY_CONDITION 0x04
- /* Control field templates */
- #define LAPB_I 0x00 /* Information frames */
- #define LAPB_S 0x01 /* Supervisory frames */
- #define LAPB_U 0x03 /* Unnumbered frames */
- #define LAPB_RR 0x01 /* Receiver ready */
- #define LAPB_RNR 0x05 /* Receiver not ready */
- #define LAPB_REJ 0x09 /* Reject */
- #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
- #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
- #define LAPB_DISC 0x43 /* Disconnect */
- #define LAPB_DM 0x0F /* Disconnected mode */
- #define LAPB_UA 0x63 /* Unnumbered acknowledge */
- #define LAPB_FRMR 0x87 /* Frame reject */
- #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
- #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
- #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
- #define LAPB_FRMR_W 0x01 /* Control field invalid */
- #define LAPB_FRMR_X 0x02 /* I field invalid */
- #define LAPB_FRMR_Y 0x04 /* I field too long */
- #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
- #define LAPB_POLLOFF 0
- #define LAPB_POLLON 1
- /* LAPB C-bit */
- #define LAPB_COMMAND 1
- #define LAPB_RESPONSE 2
- #define LAPB_ADDR_A 0x03
- #define LAPB_ADDR_B 0x01
- #define LAPB_ADDR_C 0x0F
- #define LAPB_ADDR_D 0x07
- /* Define Link State constants. */
- enum {
- LAPB_STATE_0, /* Disconnected State */
- LAPB_STATE_1, /* Awaiting Connection State */
- LAPB_STATE_2, /* Awaiting Disconnection State */
- LAPB_STATE_3, /* Data Transfer State */
- LAPB_STATE_4 /* Frame Reject State */
- };
- #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
- #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
- #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
- #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
- #define LAPB_DEFAULT_N2 20 /* N2=20 */
- #define LAPB_SMODULUS 8
- #define LAPB_EMODULUS 128
- /*
- * Information about the current frame.
- */
- struct lapb_frame {
- unsigned short type; /* Parsed type */
- unsigned short nr, ns; /* N(R), N(S) */
- unsigned char cr; /* Command/Response */
- unsigned char pf; /* Poll/Final */
- unsigned char control[2]; /* Original control data*/
- };
- /*
- * The per LAPB connection control structure.
- */
- typedef struct lapb_cb {
- struct lapb_cb *next;
- void *token;
- /* Link status fields */
- unsigned int mode;
- unsigned char state;
- unsigned short vs, vr, va;
- unsigned char condition;
- unsigned short n2, n2count;
- unsigned short t1, t2;
- struct timer_list t1timer, t2timer;
- /* Internal control information */
- struct sk_buff_head write_queue;
- struct sk_buff_head ack_queue;
- unsigned char window;
- struct lapb_register_struct callbacks;
- /* FRMR control information */
- struct lapb_frame frmr_data;
- unsigned char frmr_type;
- } lapb_cb;
- /* lapb_iface.c */
- extern void lapb_connect_confirmation(lapb_cb *, int);
- extern void lapb_connect_indication(lapb_cb *, int);
- extern void lapb_disconnect_confirmation(lapb_cb *, int);
- extern void lapb_disconnect_indication(lapb_cb *, int);
- extern int lapb_data_indication(lapb_cb *, struct sk_buff *);
- extern int lapb_data_transmit(lapb_cb *, struct sk_buff *);
- /* lapb_in.c */
- extern void lapb_data_input(lapb_cb *, struct sk_buff *);
- /* lapb_out.c */
- extern void lapb_kick(lapb_cb *);
- extern void lapb_transmit_buffer(lapb_cb *, struct sk_buff *, int);
- extern void lapb_establish_data_link(lapb_cb *);
- extern void lapb_enquiry_response(lapb_cb *);
- extern void lapb_timeout_response(lapb_cb *);
- extern void lapb_check_iframes_acked(lapb_cb *, unsigned short);
- extern void lapb_check_need_response(lapb_cb *, int, int);
- /* lapb_subr.c */
- extern void lapb_clear_queues(lapb_cb *);
- extern void lapb_frames_acked(lapb_cb *, unsigned short);
- extern void lapb_requeue_frames(lapb_cb *);
- extern int lapb_validate_nr(lapb_cb *, unsigned short);
- extern void lapb_decode(lapb_cb *, struct sk_buff *, struct lapb_frame *);
- extern void lapb_send_control(lapb_cb *, int, int, int);
- extern void lapb_transmit_frmr(lapb_cb *);
- /* lapb_timer.c */
- extern void lapb_start_t1timer(lapb_cb *);
- extern void lapb_start_t2timer(lapb_cb *);
- extern void lapb_stop_t1timer(lapb_cb *);
- extern void lapb_stop_t2timer(lapb_cb *);
- extern int lapb_t1timer_running(lapb_cb *);
- /*
- * Debug levels.
- * 0 = Off
- * 1 = State Changes
- * 2 = Packets I/O and State Changes
- * 3 = Hex dumps, Packets I/O and State Changes.
- */
- #define LAPB_DEBUG 0
- #endif