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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 | ||
a508da6c JP |
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
18 | ||
1da177e4 LT |
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> | |
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
1da177e4 LT |
33 | #include <linux/fcntl.h> |
34 | #include <linux/mm.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <net/lapb.h> | |
37 | ||
83a37b32 KC |
38 | static void lapb_t1timer_expiry(struct timer_list *); |
39 | static void lapb_t2timer_expiry(struct timer_list *); | |
1da177e4 LT |
40 | |
41 | void lapb_start_t1timer(struct lapb_cb *lapb) | |
42 | { | |
43 | del_timer(&lapb->t1timer); | |
44 | ||
841b86f3 | 45 | lapb->t1timer.function = lapb_t1timer_expiry; |
1da177e4 LT |
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 | ||
841b86f3 | 55 | lapb->t2timer.function = lapb_t2timer_expiry; |
1da177e4 LT |
56 | lapb->t2timer.expires = jiffies + lapb->t2; |
57 | ||
58 | add_timer(&lapb->t2timer); | |
59 | } | |
60 | ||
61 | void lapb_stop_t1timer(struct lapb_cb *lapb) | |
62 | { | |
63 | del_timer(&lapb->t1timer); | |
64 | } | |
65 | ||
66 | void lapb_stop_t2timer(struct lapb_cb *lapb) | |
67 | { | |
68 | del_timer(&lapb->t2timer); | |
69 | } | |
70 | ||
71 | int lapb_t1timer_running(struct lapb_cb *lapb) | |
72 | { | |
73 | return timer_pending(&lapb->t1timer); | |
74 | } | |
75 | ||
83a37b32 | 76 | static void lapb_t2timer_expiry(struct timer_list *t) |
1da177e4 | 77 | { |
83a37b32 | 78 | struct lapb_cb *lapb = from_timer(lapb, t, t2timer); |
1da177e4 LT |
79 | |
80 | if (lapb->condition & LAPB_ACK_PENDING_CONDITION) { | |
81 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; | |
82 | lapb_timeout_response(lapb); | |
83 | } | |
84 | } | |
85 | ||
83a37b32 | 86 | static void lapb_t1timer_expiry(struct timer_list *t) |
1da177e4 | 87 | { |
83a37b32 | 88 | struct lapb_cb *lapb = from_timer(lapb, t, t1timer); |
1da177e4 LT |
89 | |
90 | switch (lapb->state) { | |
91 | ||
92 | /* | |
93 | * If we are a DCE, keep going DM .. DM .. DM | |
94 | */ | |
95 | case LAPB_STATE_0: | |
96 | if (lapb->mode & LAPB_DCE) | |
97 | lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE); | |
98 | break; | |
99 | ||
100 | /* | |
101 | * Awaiting connection state, send SABM(E), up to N2 times. | |
102 | */ | |
56d6c3d7 | 103 | case LAPB_STATE_1: |
1da177e4 LT |
104 | if (lapb->n2count == lapb->n2) { |
105 | lapb_clear_queues(lapb); | |
106 | lapb->state = LAPB_STATE_0; | |
107 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); | |
a508da6c | 108 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); |
1da177e4 LT |
109 | return; |
110 | } else { | |
111 | lapb->n2count++; | |
112 | if (lapb->mode & LAPB_EXTENDED) { | |
a508da6c JP |
113 | lapb_dbg(1, "(%p) S1 TX SABME(1)\n", |
114 | lapb->dev); | |
1da177e4 LT |
115 | lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND); |
116 | } else { | |
a508da6c JP |
117 | lapb_dbg(1, "(%p) S1 TX SABM(1)\n", |
118 | lapb->dev); | |
1da177e4 LT |
119 | lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND); |
120 | } | |
121 | } | |
122 | break; | |
123 | ||
124 | /* | |
125 | * Awaiting disconnection state, send DISC, up to N2 times. | |
126 | */ | |
127 | case LAPB_STATE_2: | |
128 | if (lapb->n2count == lapb->n2) { | |
129 | lapb_clear_queues(lapb); | |
130 | lapb->state = LAPB_STATE_0; | |
131 | lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT); | |
a508da6c | 132 | lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
1da177e4 LT |
133 | return; |
134 | } else { | |
135 | lapb->n2count++; | |
a508da6c | 136 | lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev); |
1da177e4 LT |
137 | lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); |
138 | } | |
139 | break; | |
140 | ||
141 | /* | |
142 | * Data transfer state, restransmit I frames, up to N2 times. | |
143 | */ | |
144 | case LAPB_STATE_3: | |
145 | if (lapb->n2count == lapb->n2) { | |
146 | lapb_clear_queues(lapb); | |
147 | lapb->state = LAPB_STATE_0; | |
148 | lapb_stop_t2timer(lapb); | |
149 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); | |
a508da6c | 150 | lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); |
1da177e4 LT |
151 | return; |
152 | } else { | |
153 | lapb->n2count++; | |
154 | lapb_requeue_frames(lapb); | |
a224bd36 | 155 | lapb_kick(lapb); |
1da177e4 LT |
156 | } |
157 | break; | |
158 | ||
159 | /* | |
160 | * Frame reject state, restransmit FRMR frames, up to N2 times. | |
161 | */ | |
162 | case LAPB_STATE_4: | |
163 | if (lapb->n2count == lapb->n2) { | |
164 | lapb_clear_queues(lapb); | |
165 | lapb->state = LAPB_STATE_0; | |
166 | lapb_disconnect_indication(lapb, LAPB_TIMEDOUT); | |
a508da6c | 167 | lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev); |
1da177e4 LT |
168 | return; |
169 | } else { | |
170 | lapb->n2count++; | |
171 | lapb_transmit_frmr(lapb); | |
172 | } | |
173 | break; | |
174 | } | |
175 | ||
176 | lapb_start_t1timer(lapb); | |
177 | } |