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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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | |
19 | #include <linux/errno.h> |
20 | #include <linux/types.h> |
21 | #include <linux/socket.h> |
22 | #include <linux/in.h> |
23 | #include <linux/kernel.h> |
24 | #include <linux/jiffies.h> |
25 | #include <linux/timer.h> |
26 | #include <linux/string.h> |
27 | #include <linux/sockios.h> |
28 | #include <linux/net.h> |
29 | #include <linux/inet.h> |
30 | #include <linux/skbuff.h> |
31 | #include <net/sock.h> |
32 | #include <asm/uaccess.h> |
33 | #include <linux/fcntl.h> |
34 | #include <linux/mm.h> |
35 | #include <linux/interrupt.h> |
36 | #include <net/lapb.h> |
37 | |
38 | static void lapb_t1timer_expiry(unsigned long); |
39 | static void lapb_t2timer_expiry(unsigned long); |
40 | |
41 | void lapb_start_t1timer(struct lapb_cb *lapb) |
42 | { |
43 | del_timer(&lapb->t1timer); |
44 | |
45 | lapb->t1timer.data = (unsigned long)lapb; |
46 | lapb->t1timer.function = &lapb_t1timer_expiry; |
47 | lapb->t1timer.expires = jiffies + lapb->t1; |
48 | |
49 | add_timer(&lapb->t1timer); |
50 | } |
51 | |
52 | void lapb_start_t2timer(struct lapb_cb *lapb) |
53 | { |
54 | del_timer(&lapb->t2timer); |
55 | |
56 | lapb->t2timer.data = (unsigned long)lapb; |
57 | lapb->t2timer.function = &lapb_t2timer_expiry; |
58 | lapb->t2timer.expires = jiffies + lapb->t2; |
59 | |
60 | add_timer(&lapb->t2timer); |
61 | } |
62 | |
63 | void lapb_stop_t1timer(struct lapb_cb *lapb) |
64 | { |
65 | del_timer(&lapb->t1timer); |
66 | } |
67 | |
68 | void lapb_stop_t2timer(struct lapb_cb *lapb) |
69 | { |
70 | del_timer(&lapb->t2timer); |
71 | } |
72 | |
73 | int lapb_t1timer_running(struct lapb_cb *lapb) |
74 | { |
75 | return timer_pending(&lapb->t1timer); |
76 | } |
77 | |
78 | static void lapb_t2timer_expiry(unsigned long param) |
79 | { |
80 | struct lapb_cb *lapb = (struct lapb_cb *)param; |
81 | |
82 | if (lapb->condition & LAPB_ACK_PENDING_CONDITION) { |
83 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; |
84 | lapb_timeout_response(lapb); |
85 | } |
86 | } |
87 | |
88 | static void lapb_t1timer_expiry(unsigned long param) |
89 | { |
90 | struct lapb_cb *lapb = (struct lapb_cb *)param; |
91 | |
92 | switch (lapb->state) { |
93 | |
94 | /* |
95 | * If we are a DCE, keep going DM .. DM .. DM |
96 | */ |
97 | case LAPB_STATE_0: |
98 | if (lapb->mode & LAPB_DCE) |
99 | lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE); |
100 | break; |
101 | |
102 | /* |
103 | * Awaiting connection state, send SABM(E), up to N2 times. |
104 | */ |
105 | case LAPB_STATE_1: |
106 | if (lapb->n2count == lapb->n2) { |
107 | lapb_clear_queues(lapb); |
108 | lapb->state = LAPB_STATE_0; |
109 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); |
110 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); |
111 | return; |
112 | } else { |
113 | lapb->n2count++; |
114 | if (lapb->mode & LAPB_EXTENDED) { |
115 | lapb_dbg(1, "(%p) S1 TX SABME(1)\n", |
116 | lapb->dev); |
117 | lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND); |
118 | } else { |
119 | lapb_dbg(1, "(%p) S1 TX SABM(1)\n", |
120 | lapb->dev); |
121 | lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND); |
122 | } |
123 | } |
124 | break; |
125 | |
126 | /* |
127 | * Awaiting disconnection state, send DISC, up to N2 times. |
128 | */ |
129 | case LAPB_STATE_2: |
130 | if (lapb->n2count == lapb->n2) { |
131 | lapb_clear_queues(lapb); |
132 | lapb->state = LAPB_STATE_0; |
133 | lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT); |
134 | lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
135 | return; |
136 | } else { |
137 | lapb->n2count++; |
138 | lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev); |
139 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); |
140 | } |
141 | break; |
142 | |
143 | /* |
144 | * Data transfer state, restransmit I frames, up to N2 times. |
145 | */ |
146 | case LAPB_STATE_3: |
147 | if (lapb->n2count == lapb->n2) { |
148 | lapb_clear_queues(lapb); |
149 | lapb->state = LAPB_STATE_0; |
150 | lapb_stop_t2timer(lapb); |
151 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); |
152 | lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); |
153 | return; |
154 | } else { |
155 | lapb->n2count++; |
156 | lapb_requeue_frames(lapb); |
157 | lapb_kick(lapb); |
158 | } |
159 | break; |
160 | |
161 | /* |
162 | * Frame reject state, restransmit FRMR frames, up to N2 times. |
163 | */ |
164 | case LAPB_STATE_4: |
165 | if (lapb->n2count == lapb->n2) { |
166 | lapb_clear_queues(lapb); |
167 | lapb->state = LAPB_STATE_0; |
168 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); |
169 | lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev); |
170 | return; |
171 | } else { |
172 | lapb->n2count++; |
173 | lapb_transmit_frmr(lapb); |
174 | } |
175 | break; |
176 | } |
177 | |
178 | lapb_start_t1timer(lapb); |
179 | } |
180 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9