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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | #ifndef _LAPB_H |
3 | #define _LAPB_H |
4 | #include <linux/lapb.h> |
5 | #include <linux/refcount.h> |
6 | |
7 | #define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */ |
8 | |
9 | #define LAPB_ACK_PENDING_CONDITION 0x01 |
10 | #define LAPB_REJECT_CONDITION 0x02 |
11 | #define LAPB_PEER_RX_BUSY_CONDITION 0x04 |
12 | |
13 | /* Control field templates */ |
14 | #define LAPB_I 0x00 /* Information frames */ |
15 | #define LAPB_S 0x01 /* Supervisory frames */ |
16 | #define LAPB_U 0x03 /* Unnumbered frames */ |
17 | |
18 | #define LAPB_RR 0x01 /* Receiver ready */ |
19 | #define LAPB_RNR 0x05 /* Receiver not ready */ |
20 | #define LAPB_REJ 0x09 /* Reject */ |
21 | |
22 | #define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */ |
23 | #define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */ |
24 | #define LAPB_DISC 0x43 /* Disconnect */ |
25 | #define LAPB_DM 0x0F /* Disconnected mode */ |
26 | #define LAPB_UA 0x63 /* Unnumbered acknowledge */ |
27 | #define LAPB_FRMR 0x87 /* Frame reject */ |
28 | |
29 | #define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */ |
30 | |
31 | #define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */ |
32 | #define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */ |
33 | |
34 | #define LAPB_FRMR_W 0x01 /* Control field invalid */ |
35 | #define LAPB_FRMR_X 0x02 /* I field invalid */ |
36 | #define LAPB_FRMR_Y 0x04 /* I field too long */ |
37 | #define LAPB_FRMR_Z 0x08 /* Invalid N(R) */ |
38 | |
39 | #define LAPB_POLLOFF 0 |
40 | #define LAPB_POLLON 1 |
41 | |
42 | /* LAPB C-bit */ |
43 | #define LAPB_COMMAND 1 |
44 | #define LAPB_RESPONSE 2 |
45 | |
46 | #define LAPB_ADDR_A 0x03 |
47 | #define LAPB_ADDR_B 0x01 |
48 | #define LAPB_ADDR_C 0x0F |
49 | #define LAPB_ADDR_D 0x07 |
50 | |
51 | /* Define Link State constants. */ |
52 | enum { |
53 | LAPB_STATE_0, /* Disconnected State */ |
54 | LAPB_STATE_1, /* Awaiting Connection State */ |
55 | LAPB_STATE_2, /* Awaiting Disconnection State */ |
56 | LAPB_STATE_3, /* Data Transfer State */ |
57 | LAPB_STATE_4 /* Frame Reject State */ |
58 | }; |
59 | |
60 | #define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE) |
61 | #define LAPB_DEFAULT_WINDOW 7 /* Window=7 */ |
62 | #define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */ |
63 | #define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */ |
64 | #define LAPB_DEFAULT_N2 20 /* N2=20 */ |
65 | |
66 | #define LAPB_SMODULUS 8 |
67 | #define LAPB_EMODULUS 128 |
68 | |
69 | /* |
70 | * Information about the current frame. |
71 | */ |
72 | struct lapb_frame { |
73 | unsigned short type; /* Parsed type */ |
74 | unsigned short nr, ns; /* N(R), N(S) */ |
75 | unsigned char cr; /* Command/Response */ |
76 | unsigned char pf; /* Poll/Final */ |
77 | unsigned char control[2]; /* Original control data*/ |
78 | }; |
79 | |
80 | /* |
81 | * The per LAPB connection control structure. |
82 | */ |
83 | struct lapb_cb { |
84 | struct list_head node; |
85 | struct net_device *dev; |
86 | |
87 | /* Link status fields */ |
88 | unsigned int mode; |
89 | unsigned char state; |
90 | unsigned short vs, vr, va; |
91 | unsigned char condition; |
92 | unsigned short n2, n2count; |
93 | unsigned short t1, t2; |
94 | struct timer_list t1timer, t2timer; |
95 | bool t1timer_running, t2timer_running; |
96 | |
97 | /* Internal control information */ |
98 | struct sk_buff_head write_queue; |
99 | struct sk_buff_head ack_queue; |
100 | unsigned char window; |
101 | const struct lapb_register_struct *callbacks; |
102 | |
103 | /* FRMR control information */ |
104 | struct lapb_frame frmr_data; |
105 | unsigned char frmr_type; |
106 | |
107 | spinlock_t lock; |
108 | refcount_t refcnt; |
109 | }; |
110 | |
111 | /* lapb_iface.c */ |
112 | void lapb_connect_confirmation(struct lapb_cb *lapb, int); |
113 | void lapb_connect_indication(struct lapb_cb *lapb, int); |
114 | void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); |
115 | void lapb_disconnect_indication(struct lapb_cb *lapb, int); |
116 | int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); |
117 | int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); |
118 | |
119 | /* lapb_in.c */ |
120 | void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); |
121 | |
122 | /* lapb_out.c */ |
123 | void lapb_kick(struct lapb_cb *lapb); |
124 | void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); |
125 | void lapb_establish_data_link(struct lapb_cb *lapb); |
126 | void lapb_enquiry_response(struct lapb_cb *lapb); |
127 | void lapb_timeout_response(struct lapb_cb *lapb); |
128 | void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); |
129 | void lapb_check_need_response(struct lapb_cb *lapb, int, int); |
130 | |
131 | /* lapb_subr.c */ |
132 | void lapb_clear_queues(struct lapb_cb *lapb); |
133 | void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); |
134 | void lapb_requeue_frames(struct lapb_cb *lapb); |
135 | int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); |
136 | int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); |
137 | void lapb_send_control(struct lapb_cb *lapb, int, int, int); |
138 | void lapb_transmit_frmr(struct lapb_cb *lapb); |
139 | |
140 | /* lapb_timer.c */ |
141 | void lapb_start_t1timer(struct lapb_cb *lapb); |
142 | void lapb_start_t2timer(struct lapb_cb *lapb); |
143 | void lapb_stop_t1timer(struct lapb_cb *lapb); |
144 | void lapb_stop_t2timer(struct lapb_cb *lapb); |
145 | int lapb_t1timer_running(struct lapb_cb *lapb); |
146 | |
147 | /* |
148 | * Debug levels. |
149 | * 0 = Off |
150 | * 1 = State Changes |
151 | * 2 = Packets I/O and State Changes |
152 | * 3 = Hex dumps, Packets I/O and State Changes. |
153 | */ |
154 | #define LAPB_DEBUG 0 |
155 | |
156 | #define lapb_dbg(level, fmt, ...) \ |
157 | do { \ |
158 | if (level < LAPB_DEBUG) \ |
159 | pr_debug(fmt, ##__VA_ARGS__); \ |
160 | } while (0) |
161 | |
162 | #endif |
163 |
Warning: This file is not a C or C++ file. It does not have highlighting.