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[net-next-2.6.git] / include / net / lapb.h
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1da177e4
LT		 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 */
81struct lapb_cb {
82 struct list_head node;
83 struct net_device *dev;
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
104 atomic_t refcnt;
105};
106
107/* lapb_iface.c */
108extern void lapb_connect_confirmation(struct lapb_cb *lapb, int);
109extern void lapb_connect_indication(struct lapb_cb *lapb, int);
110extern void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
111extern void lapb_disconnect_indication(struct lapb_cb *lapb, int);
112extern int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
113extern int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
114
115/* lapb_in.c */
116extern void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
117
118/* lapb_out.c */
119extern void lapb_kick(struct lapb_cb *lapb);
120extern void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
121extern void lapb_establish_data_link(struct lapb_cb *lapb);
122extern void lapb_enquiry_response(struct lapb_cb *lapb);
123extern void lapb_timeout_response(struct lapb_cb *lapb);
124extern void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
125extern void lapb_check_need_response(struct lapb_cb *lapb, int, int);
126
127/* lapb_subr.c */
128extern void lapb_clear_queues(struct lapb_cb *lapb);
129extern void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
130extern void lapb_requeue_frames(struct lapb_cb *lapb);
131extern int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
132extern int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
133extern void lapb_send_control(struct lapb_cb *lapb, int, int, int);
134extern void lapb_transmit_frmr(struct lapb_cb *lapb);
135
136/* lapb_timer.c */
137extern void lapb_start_t1timer(struct lapb_cb *lapb);
138extern void lapb_start_t2timer(struct lapb_cb *lapb);
139extern void lapb_stop_t1timer(struct lapb_cb *lapb);
140extern void lapb_stop_t2timer(struct lapb_cb *lapb);
141extern int lapb_t1timer_running(struct lapb_cb *lapb);
142
143/*
144 * Debug levels.
145 * 0 = Off
146 * 1 = State Changes
147 * 2 = Packets I/O and State Changes
148 * 3 = Hex dumps, Packets I/O and State Changes.
149 */
150#define LAPB_DEBUG 0
151
152#endif
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