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