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1da177e4 LT |
1 | /* |
2 | * LAPB release 002 | |
3 | * | |
4 | * This code REQUIRES 2.1.15 or higher/ NET3.038 | |
5 | * | |
6 | * This module: | |
7 | * This module is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * History | |
13 | * LAPB 001 Jonathan Naylor Started Coding | |
14 | * LAPB 002 Jonathan Naylor New timer architecture. | |
15 | */ | |
16 | ||
17 | #include <linux/errno.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/in.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/jiffies.h> | |
23 | #include <linux/timer.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/inet.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <net/sock.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/system.h> | |
32 | #include <linux/fcntl.h> | |
33 | #include <linux/mm.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <net/lapb.h> | |
36 | ||
37 | static void lapb_t1timer_expiry(unsigned long); | |
38 | static void lapb_t2timer_expiry(unsigned long); | |
39 | ||
40 | void lapb_start_t1timer(struct lapb_cb *lapb) | |
41 | { | |
42 | del_timer(&lapb->t1timer); | |
43 | ||
44 | lapb->t1timer.data = (unsigned long)lapb; | |
45 | lapb->t1timer.function = &lapb_t1timer_expiry; | |
46 | lapb->t1timer.expires = jiffies + lapb->t1; | |
47 | ||
48 | add_timer(&lapb->t1timer); | |
49 | } | |
50 | ||
51 | void lapb_start_t2timer(struct lapb_cb *lapb) | |
52 | { | |
53 | del_timer(&lapb->t2timer); | |
54 | ||
55 | lapb->t2timer.data = (unsigned long)lapb; | |
56 | lapb->t2timer.function = &lapb_t2timer_expiry; | |
57 | lapb->t2timer.expires = jiffies + lapb->t2; | |
58 | ||
59 | add_timer(&lapb->t2timer); | |
60 | } | |
61 | ||
62 | void lapb_stop_t1timer(struct lapb_cb *lapb) | |
63 | { | |
64 | del_timer(&lapb->t1timer); | |
65 | } | |
66 | ||
67 | void lapb_stop_t2timer(struct lapb_cb *lapb) | |
68 | { | |
69 | del_timer(&lapb->t2timer); | |
70 | } | |
71 | ||
72 | int lapb_t1timer_running(struct lapb_cb *lapb) | |
73 | { | |
74 | return timer_pending(&lapb->t1timer); | |
75 | } | |
76 | ||
77 | static void lapb_t2timer_expiry(unsigned long param) | |
78 | { | |
79 | struct lapb_cb *lapb = (struct lapb_cb *)param; | |
80 | ||
81 | if (lapb->condition & LAPB_ACK_PENDING_CONDITION) { | |
82 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; | |
83 | lapb_timeout_response(lapb); | |
84 | } | |
85 | } | |
86 | ||
87 | static void lapb_t1timer_expiry(unsigned long param) | |
88 | { | |
89 | struct lapb_cb *lapb = (struct lapb_cb *)param; | |
90 | ||
91 | switch (lapb->state) { | |
92 | ||
93 | /* | |
94 | * If we are a DCE, keep going DM .. DM .. DM | |
95 | */ | |
96 | case LAPB_STATE_0: | |
97 | if (lapb->mode & LAPB_DCE) | |
98 | lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE); | |
99 | break; | |
100 | ||
101 | /* | |
102 | * Awaiting connection state, send SABM(E), up to N2 times. | |
103 | */ | |
56d6c3d7 | 104 | case LAPB_STATE_1: |
1da177e4 LT |
105 | if (lapb->n2count == lapb->n2) { |
106 | lapb_clear_queues(lapb); | |
107 | lapb->state = LAPB_STATE_0; | |
108 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); | |
109 | #if LAPB_DEBUG > 0 | |
110 | printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev); | |
111 | #endif | |
112 | return; | |
113 | } else { | |
114 | lapb->n2count++; | |
115 | if (lapb->mode & LAPB_EXTENDED) { | |
116 | #if LAPB_DEBUG > 1 | |
117 | printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev); | |
118 | #endif | |
119 | lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND); | |
120 | } else { | |
121 | #if LAPB_DEBUG > 1 | |
122 | printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev); | |
123 | #endif | |
124 | lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND); | |
125 | } | |
126 | } | |
127 | break; | |
128 | ||
129 | /* | |
130 | * Awaiting disconnection state, send DISC, up to N2 times. | |
131 | */ | |
132 | case LAPB_STATE_2: | |
133 | if (lapb->n2count == lapb->n2) { | |
134 | lapb_clear_queues(lapb); | |
135 | lapb->state = LAPB_STATE_0; | |
136 | lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT); | |
137 | #if LAPB_DEBUG > 0 | |
138 | printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev); | |
139 | #endif | |
140 | return; | |
141 | } else { | |
142 | lapb->n2count++; | |
143 | #if LAPB_DEBUG > 1 | |
144 | printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev); | |
145 | #endif | |
146 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); | |
147 | } | |
148 | break; | |
149 | ||
150 | /* | |
151 | * Data transfer state, restransmit I frames, up to N2 times. | |
152 | */ | |
153 | case LAPB_STATE_3: | |
154 | if (lapb->n2count == lapb->n2) { | |
155 | lapb_clear_queues(lapb); | |
156 | lapb->state = LAPB_STATE_0; | |
157 | lapb_stop_t2timer(lapb); | |
158 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); | |
159 | #if LAPB_DEBUG > 0 | |
160 | printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev); | |
161 | #endif | |
162 | return; | |
163 | } else { | |
164 | lapb->n2count++; | |
165 | lapb_requeue_frames(lapb); | |
166 | } | |
167 | break; | |
168 | ||
169 | /* | |
170 | * Frame reject state, restransmit FRMR frames, up to N2 times. | |
171 | */ | |
172 | case LAPB_STATE_4: | |
173 | if (lapb->n2count == lapb->n2) { | |
174 | lapb_clear_queues(lapb); | |
175 | lapb->state = LAPB_STATE_0; | |
176 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); | |
177 | #if LAPB_DEBUG > 0 | |
178 | printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev); | |
179 | #endif | |
180 | return; | |
181 | } else { | |
182 | lapb->n2count++; | |
183 | lapb_transmit_frmr(lapb); | |
184 | } | |
185 | break; | |
186 | } | |
187 | ||
188 | lapb_start_t1timer(lapb); | |
189 | } |