]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LAPB_H |
2 | #define _LAPB_H | |
3 | #include <linux/lapb.h> | |
0408c58b | 4 | #include <linux/refcount.h> |
1da177e4 LT |
5 | |
6 | #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */ | |
7 | ||
8 | #define LAPB_ACK_PENDING_CONDITION 0x01 | |
9 | #define LAPB_REJECT_CONDITION 0x02 | |
10 | #define LAPB_PEER_RX_BUSY_CONDITION 0x04 | |
11 | ||
12 | /* Control field templates */ | |
13 | #define LAPB_I 0x00 /* Information frames */ | |
14 | #define LAPB_S 0x01 /* Supervisory frames */ | |
15 | #define LAPB_U 0x03 /* Unnumbered frames */ | |
16 | ||
17 | #define LAPB_RR 0x01 /* Receiver ready */ | |
18 | #define LAPB_RNR 0x05 /* Receiver not ready */ | |
19 | #define LAPB_REJ 0x09 /* Reject */ | |
20 | ||
21 | #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */ | |
22 | #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */ | |
23 | #define LAPB_DISC 0x43 /* Disconnect */ | |
24 | #define LAPB_DM 0x0F /* Disconnected mode */ | |
25 | #define LAPB_UA 0x63 /* Unnumbered acknowledge */ | |
26 | #define LAPB_FRMR 0x87 /* Frame reject */ | |
27 | ||
28 | #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */ | |
29 | ||
30 | #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */ | |
31 | #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */ | |
32 | ||
33 | #define LAPB_FRMR_W 0x01 /* Control field invalid */ | |
34 | #define LAPB_FRMR_X 0x02 /* I field invalid */ | |
35 | #define LAPB_FRMR_Y 0x04 /* I field too long */ | |
36 | #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */ | |
37 | ||
38 | #define LAPB_POLLOFF 0 | |
39 | #define LAPB_POLLON 1 | |
40 | ||
41 | /* LAPB C-bit */ | |
42 | #define LAPB_COMMAND 1 | |
43 | #define LAPB_RESPONSE 2 | |
44 | ||
45 | #define LAPB_ADDR_A 0x03 | |
46 | #define LAPB_ADDR_B 0x01 | |
47 | #define LAPB_ADDR_C 0x0F | |
48 | #define LAPB_ADDR_D 0x07 | |
49 | ||
50 | /* Define Link State constants. */ | |
51 | enum { | |
52 | LAPB_STATE_0, /* Disconnected State */ | |
53 | LAPB_STATE_1, /* Awaiting Connection State */ | |
54 | LAPB_STATE_2, /* Awaiting Disconnection State */ | |
55 | LAPB_STATE_3, /* Data Transfer State */ | |
56 | LAPB_STATE_4 /* Frame Reject State */ | |
57 | }; | |
58 | ||
59 | #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE) | |
60 | #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */ | |
61 | #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */ | |
62 | #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */ | |
63 | #define LAPB_DEFAULT_N2 20 /* N2=20 */ | |
64 | ||
65 | #define LAPB_SMODULUS 8 | |
66 | #define LAPB_EMODULUS 128 | |
67 | ||
68 | /* | |
69 | * Information about the current frame. | |
70 | */ | |
71 | struct lapb_frame { | |
72 | unsigned short type; /* Parsed type */ | |
73 | unsigned short nr, ns; /* N(R), N(S) */ | |
74 | unsigned char cr; /* Command/Response */ | |
75 | unsigned char pf; /* Poll/Final */ | |
76 | unsigned char control[2]; /* Original control data*/ | |
77 | }; | |
78 | ||
79 | /* | |
80 | * The per LAPB connection control structure. | |
81 | */ | |
82 | struct lapb_cb { | |
83 | struct list_head node; | |
84 | struct net_device *dev; | |
85 | ||
86 | /* Link status fields */ | |
87 | unsigned int mode; | |
88 | unsigned char state; | |
89 | unsigned short vs, vr, va; | |
90 | unsigned char condition; | |
91 | unsigned short n2, n2count; | |
92 | unsigned short t1, t2; | |
93 | struct timer_list t1timer, t2timer; | |
94 | ||
95 | /* Internal control information */ | |
96 | struct sk_buff_head write_queue; | |
97 | struct sk_buff_head ack_queue; | |
98 | unsigned char window; | |
d97a077a | 99 | const struct lapb_register_struct *callbacks; |
1da177e4 LT |
100 | |
101 | /* FRMR control information */ | |
102 | struct lapb_frame frmr_data; | |
103 | unsigned char frmr_type; | |
104 | ||
0408c58b | 105 | refcount_t refcnt; |
1da177e4 LT |
106 | }; |
107 | ||
108 | /* lapb_iface.c */ | |
cb7d3d71 JP |
109 | void lapb_connect_confirmation(struct lapb_cb *lapb, int); |
110 | void lapb_connect_indication(struct lapb_cb *lapb, int); | |
111 | void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); | |
112 | void lapb_disconnect_indication(struct lapb_cb *lapb, int); | |
113 | int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); | |
114 | int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); | |
1da177e4 LT |
115 | |
116 | /* lapb_in.c */ | |
cb7d3d71 | 117 | void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); |
1da177e4 LT |
118 | |
119 | /* lapb_out.c */ | |
cb7d3d71 JP |
120 | void lapb_kick(struct lapb_cb *lapb); |
121 | void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); | |
122 | void lapb_establish_data_link(struct lapb_cb *lapb); | |
123 | void lapb_enquiry_response(struct lapb_cb *lapb); | |
124 | void lapb_timeout_response(struct lapb_cb *lapb); | |
125 | void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); | |
126 | void lapb_check_need_response(struct lapb_cb *lapb, int, int); | |
1da177e4 LT |
127 | |
128 | /* lapb_subr.c */ | |
cb7d3d71 JP |
129 | void lapb_clear_queues(struct lapb_cb *lapb); |
130 | void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); | |
131 | void lapb_requeue_frames(struct lapb_cb *lapb); | |
132 | int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); | |
133 | int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); | |
134 | void lapb_send_control(struct lapb_cb *lapb, int, int, int); | |
135 | void lapb_transmit_frmr(struct lapb_cb *lapb); | |
1da177e4 LT |
136 | |
137 | /* lapb_timer.c */ | |
cb7d3d71 JP |
138 | void lapb_start_t1timer(struct lapb_cb *lapb); |
139 | void lapb_start_t2timer(struct lapb_cb *lapb); | |
140 | void lapb_stop_t1timer(struct lapb_cb *lapb); | |
141 | void lapb_stop_t2timer(struct lapb_cb *lapb); | |
142 | int lapb_t1timer_running(struct lapb_cb *lapb); | |
1da177e4 LT |
143 | |
144 | /* | |
145 | * Debug levels. | |
146 | * 0 = Off | |
147 | * 1 = State Changes | |
148 | * 2 = Packets I/O and State Changes | |
149 | * 3 = Hex dumps, Packets I/O and State Changes. | |
150 | */ | |
151 | #define LAPB_DEBUG 0 | |
152 | ||
a508da6c JP |
153 | #define lapb_dbg(level, fmt, ...) \ |
154 | do { \ | |
155 | if (level < LAPB_DEBUG) \ | |
156 | pr_debug(fmt, ##__VA_ARGS__); \ | |
157 | } while (0) | |
158 | ||
1da177e4 | 159 | #endif |