File: /usr/src/linux/include/net/lapb.h
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. */
50 enum {
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 */
70 struct 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 */
81 typedef 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 */
106 extern void lapb_connect_confirmation(lapb_cb *, int);
107 extern void lapb_connect_indication(lapb_cb *, int);
108 extern void lapb_disconnect_confirmation(lapb_cb *, int);
109 extern void lapb_disconnect_indication(lapb_cb *, int);
110 extern int lapb_data_indication(lapb_cb *, struct sk_buff *);
111 extern int lapb_data_transmit(lapb_cb *, struct sk_buff *);
112
113 /* lapb_in.c */
114 extern void lapb_data_input(lapb_cb *, struct sk_buff *);
115
116 /* lapb_out.c */
117 extern void lapb_kick(lapb_cb *);
118 extern void lapb_transmit_buffer(lapb_cb *, struct sk_buff *, int);
119 extern void lapb_establish_data_link(lapb_cb *);
120 extern void lapb_enquiry_response(lapb_cb *);
121 extern void lapb_timeout_response(lapb_cb *);
122 extern void lapb_check_iframes_acked(lapb_cb *, unsigned short);
123 extern void lapb_check_need_response(lapb_cb *, int, int);
124
125 /* lapb_subr.c */
126 extern void lapb_clear_queues(lapb_cb *);
127 extern void lapb_frames_acked(lapb_cb *, unsigned short);
128 extern void lapb_requeue_frames(lapb_cb *);
129 extern int lapb_validate_nr(lapb_cb *, unsigned short);
130 extern void lapb_decode(lapb_cb *, struct sk_buff *, struct lapb_frame *);
131 extern void lapb_send_control(lapb_cb *, int, int, int);
132 extern void lapb_transmit_frmr(lapb_cb *);
133
134 /* lapb_timer.c */
135 extern void lapb_start_t1timer(lapb_cb *);
136 extern void lapb_start_t2timer(lapb_cb *);
137 extern void lapb_stop_t1timer(lapb_cb *);
138 extern void lapb_stop_t2timer(lapb_cb *);
139 extern 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