[linux-block.git] / include / net / lapb.h

#ifndef _LAPB_H
#define _LAPB_H 
#include <linux/lapb.h>
#include <linux/refcount.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.
 */
struct lapb_cb {
	struct list_head	node;
	struct net_device	*dev;

	/* 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;
	const struct lapb_register_struct *callbacks;

	/* FRMR control information */
	struct lapb_frame	frmr_data;
	unsigned char		frmr_type;

	refcount_t		refcnt;
};

/* lapb_iface.c */
void lapb_connect_confirmation(struct lapb_cb *lapb, int);
void lapb_connect_indication(struct lapb_cb *lapb, int);
void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
void lapb_disconnect_indication(struct lapb_cb *lapb, int);
int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);

/* lapb_in.c */
void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);

/* lapb_out.c */
void lapb_kick(struct lapb_cb *lapb);
void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
void lapb_establish_data_link(struct lapb_cb *lapb);
void lapb_enquiry_response(struct lapb_cb *lapb);
void lapb_timeout_response(struct lapb_cb *lapb);
void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
void lapb_check_need_response(struct lapb_cb *lapb, int, int);

/* lapb_subr.c */
void lapb_clear_queues(struct lapb_cb *lapb);
void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
void lapb_requeue_frames(struct lapb_cb *lapb);
int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
void lapb_send_control(struct lapb_cb *lapb, int, int, int);
void lapb_transmit_frmr(struct lapb_cb *lapb);

/* lapb_timer.c */
void lapb_start_t1timer(struct lapb_cb *lapb);
void lapb_start_t2timer(struct lapb_cb *lapb);
void lapb_stop_t1timer(struct lapb_cb *lapb);
void lapb_stop_t2timer(struct lapb_cb *lapb);
int lapb_t1timer_running(struct lapb_cb *lapb);

/*
 * 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

#define lapb_dbg(level, fmt, ...)			\
do {							\
	if (level < LAPB_DEBUG)				\
		pr_debug(fmt, ##__VA_ARGS__);		\
} while (0)

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _LAPB_H
	2	#define _LAPB_H
	3	#include <linux/lapb.h>
0408c58b	4	#include <linux/refcount.h>
1da177e4 LT	5
	6	#define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
	7
	8	#define LAPB_ACK_PENDING_CONDITION 0x01
	9	#define LAPB_REJECT_CONDITION 0x02
	10	#define LAPB_PEER_RX_BUSY_CONDITION 0x04
	11
	12	/* Control field templates */
	13	#define LAPB_I 0x00 /* Information frames */
	14	#define LAPB_S 0x01 /* Supervisory frames */
	15	#define LAPB_U 0x03 /* Unnumbered frames */
	16
	17	#define LAPB_RR 0x01 /* Receiver ready */
	18	#define LAPB_RNR 0x05 /* Receiver not ready */
	19	#define LAPB_REJ 0x09 /* Reject */
	20
	21	#define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
	22	#define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
	23	#define LAPB_DISC 0x43 /* Disconnect */
	24	#define LAPB_DM 0x0F /* Disconnected mode */
	25	#define LAPB_UA 0x63 /* Unnumbered acknowledge */
	26	#define LAPB_FRMR 0x87 /* Frame reject */
	27
	28	#define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
	29
	30	#define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
	31	#define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
	32
	33	#define LAPB_FRMR_W 0x01 /* Control field invalid */
	34	#define LAPB_FRMR_X 0x02 /* I field invalid */
	35	#define LAPB_FRMR_Y 0x04 /* I field too long */
	36	#define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
	37
	38	#define LAPB_POLLOFF 0
	39	#define LAPB_POLLON 1
	40
	41	/* LAPB C-bit */
	42	#define LAPB_COMMAND 1
	43	#define LAPB_RESPONSE 2
	44
	45	#define LAPB_ADDR_A 0x03
	46	#define LAPB_ADDR_B 0x01
	47	#define LAPB_ADDR_C 0x0F
	48	#define LAPB_ADDR_D 0x07
	49
	50	/* Define Link State constants. */
	51	enum {
	52	LAPB_STATE_0, /* Disconnected State */
	53	LAPB_STATE_1, /* Awaiting Connection State */
	54	LAPB_STATE_2, /* Awaiting Disconnection State */
	55	LAPB_STATE_3, /* Data Transfer State */
	56	LAPB_STATE_4 /* Frame Reject State */
	57	};
	58
	59	#define LAPB_DEFAULT_MODE (LAPB_STANDARD \| LAPB_SLP \| LAPB_DTE)
	60	#define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
	61	#define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
	62	#define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
	63	#define LAPB_DEFAULT_N2 20 /* N2=20 */
	64
	65	#define LAPB_SMODULUS 8
	66	#define LAPB_EMODULUS 128
	67
	68	/*
69	* Information about the current frame.
70	*/
71	struct lapb_frame {
72	unsigned short type; /* Parsed type */
73	unsigned short nr, ns; /* N(R), N(S) */
74	unsigned char cr; /* Command/Response */
75	unsigned char pf; /* Poll/Final */
76	unsigned char control[2]; /* Original control data*/
77	};
78
79	/*
80	* The per LAPB connection control structure.
81	*/
82	struct lapb_cb {
83	struct list_head node;
84	struct net_device *dev;
85
86	/* Link status fields */
87	unsigned int mode;
88	unsigned char state;
89	unsigned short vs, vr, va;
90	unsigned char condition;
91	unsigned short n2, n2count;
92	unsigned short t1, t2;
93	struct timer_list t1timer, t2timer;
94
95	/* Internal control information */
96	struct sk_buff_head write_queue;
97	struct sk_buff_head ack_queue;
98	unsigned char window;
d97a077a	99	const struct lapb_register_struct *callbacks;
1da177e4 LT	100
	101	/* FRMR control information */
	102	struct lapb_frame frmr_data;
	103	unsigned char frmr_type;
	104
0408c58b	105	refcount_t refcnt;
1da177e4 LT	106	};
	107
	108	/* lapb_iface.c */
cb7d3d71 JP	109	void lapb_connect_confirmation(struct lapb_cb *lapb, int);
	110	void lapb_connect_indication(struct lapb_cb *lapb, int);
	111	void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
	112	void lapb_disconnect_indication(struct lapb_cb *lapb, int);
	113	int lapb_data_indication(struct lapb_cb lapb, struct sk_buff );
	114	int lapb_data_transmit(struct lapb_cb lapb, struct sk_buff );
1da177e4 LT	115
1da177e4 LT	116	/* lapb_in.c */
cb7d3d71	117	void lapb_data_input(struct lapb_cb lapb, struct sk_buff );
1da177e4 LT	118
1da177e4 LT	119	/* lapb_out.c */
cb7d3d71 JP	120	void lapb_kick(struct lapb_cb *lapb);
	121	void lapb_transmit_buffer(struct lapb_cb lapb, struct sk_buff , int);
	122	void lapb_establish_data_link(struct lapb_cb *lapb);
	123	void lapb_enquiry_response(struct lapb_cb *lapb);
	124	void lapb_timeout_response(struct lapb_cb *lapb);
	125	void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
	126	void lapb_check_need_response(struct lapb_cb *lapb, int, int);
1da177e4 LT	127
1da177e4 LT	128	/* lapb_subr.c */
cb7d3d71 JP	129	void lapb_clear_queues(struct lapb_cb *lapb);
	130	void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
	131	void lapb_requeue_frames(struct lapb_cb *lapb);
	132	int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
	133	int lapb_decode(struct lapb_cb lapb, struct sk_buff , struct lapb_frame *);
	134	void lapb_send_control(struct lapb_cb *lapb, int, int, int);
	135	void lapb_transmit_frmr(struct lapb_cb *lapb);
1da177e4 LT	136
1da177e4 LT	137	/* lapb_timer.c */
cb7d3d71 JP	138	void lapb_start_t1timer(struct lapb_cb *lapb);
	139	void lapb_start_t2timer(struct lapb_cb *lapb);
	140	void lapb_stop_t1timer(struct lapb_cb *lapb);
	141	void lapb_stop_t2timer(struct lapb_cb *lapb);
	142	int lapb_t1timer_running(struct lapb_cb *lapb);
1da177e4 LT	143
	144	/*
	145	* Debug levels.
	146	* 0 = Off
	147	* 1 = State Changes
	148	* 2 = Packets I/O and State Changes
	149	* 3 = Hex dumps, Packets I/O and State Changes.
	150	*/
	151	#define LAPB_DEBUG 0
	152
a508da6c JP	153	#define lapb_dbg(level, fmt, ...) \
	154	do { \
	155	if (level < LAPB_DEBUG) \
	156	pr_debug(fmt, ##__VA_ARGS__); \
	157	} while (0)
	158
1da177e4	159	#endif