/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LAPB_H#define _LAPB_H #include <linux/lapb.h>#include <linux/refcount.h> #define	LAPB_HEADER_LEN MAX_HEADER		/* 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;	bool			t1timer_running, t2timer_running; 	/* 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; 	spinlock_t		lock;	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