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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 | struct 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 | const 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 */ |
108 | extern void lapb_connect_confirmation(struct lapb_cb *lapb, int); |
109 | extern void lapb_connect_indication(struct lapb_cb *lapb, int); |
110 | extern void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); |
111 | extern void lapb_disconnect_indication(struct lapb_cb *lapb, int); |
112 | extern int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); |
113 | extern int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); |
114 | |
115 | /* lapb_in.c */ |
116 | extern void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); |
117 | |
118 | /* lapb_out.c */ |
119 | extern void lapb_kick(struct lapb_cb *lapb); |
120 | extern void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); |
121 | extern void lapb_establish_data_link(struct lapb_cb *lapb); |
122 | extern void lapb_enquiry_response(struct lapb_cb *lapb); |
123 | extern void lapb_timeout_response(struct lapb_cb *lapb); |
124 | extern void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); |
125 | extern void lapb_check_need_response(struct lapb_cb *lapb, int, int); |
126 | |
127 | /* lapb_subr.c */ |
128 | extern void lapb_clear_queues(struct lapb_cb *lapb); |
129 | extern void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); |
130 | extern void lapb_requeue_frames(struct lapb_cb *lapb); |
131 | extern int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); |
132 | extern int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); |
133 | extern void lapb_send_control(struct lapb_cb *lapb, int, int, int); |
134 | extern void lapb_transmit_frmr(struct lapb_cb *lapb); |
135 | |
136 | /* lapb_timer.c */ |
137 | extern void lapb_start_t1timer(struct lapb_cb *lapb); |
138 | extern void lapb_start_t2timer(struct lapb_cb *lapb); |
139 | extern void lapb_stop_t1timer(struct lapb_cb *lapb); |
140 | extern void lapb_stop_t2timer(struct lapb_cb *lapb); |
141 | extern 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 | #define lapb_dbg(level, fmt, ...) \ |
153 | do { \ |
154 | if (level < LAPB_DEBUG) \ |
155 | pr_debug(fmt, ##__VA_ARGS__); \ |
156 | } while (0) |
157 | |
158 | #endif |
159 |
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