4 * This code REQUIRES 2.1.15 or higher/ NET3.038
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.
13 * LAPB 001 Jonathan Naylor Started Coding
14 * LAPB 002 Jonathan Naylor New timer architecture.
17 #include <linux/errno.h>
18 #include <linux/types.h>
19 #include <linux/socket.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>
30 #include <asm/uaccess.h>
31 #include <asm/system.h>
32 #include <linux/fcntl.h>
34 #include <linux/interrupt.h>
37 static void lapb_t1timer_expiry(unsigned long);
38 static void lapb_t2timer_expiry(unsigned long);
40 void lapb_start_t1timer(struct lapb_cb *lapb)
42 del_timer(&lapb->t1timer);
44 lapb->t1timer.data = (unsigned long)lapb;
45 lapb->t1timer.function = &lapb_t1timer_expiry;
46 lapb->t1timer.expires = jiffies + lapb->t1;
48 add_timer(&lapb->t1timer);
51 void lapb_start_t2timer(struct lapb_cb *lapb)
53 del_timer(&lapb->t2timer);
55 lapb->t2timer.data = (unsigned long)lapb;
56 lapb->t2timer.function = &lapb_t2timer_expiry;
57 lapb->t2timer.expires = jiffies + lapb->t2;
59 add_timer(&lapb->t2timer);
62 void lapb_stop_t1timer(struct lapb_cb *lapb)
64 del_timer(&lapb->t1timer);
67 void lapb_stop_t2timer(struct lapb_cb *lapb)
69 del_timer(&lapb->t2timer);
72 int lapb_t1timer_running(struct lapb_cb *lapb)
74 return timer_pending(&lapb->t1timer);
77 static void lapb_t2timer_expiry(unsigned long param)
79 struct lapb_cb *lapb = (struct lapb_cb *)param;
81 if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
82 lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
83 lapb_timeout_response(lapb);
87 static void lapb_t1timer_expiry(unsigned long param)
89 struct lapb_cb *lapb = (struct lapb_cb *)param;
91 switch (lapb->state) {
94 * If we are a DCE, keep going DM .. DM .. DM
97 if (lapb->mode & LAPB_DCE)
98 lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
102 * Awaiting connection state, send SABM(E), up to N2 times.
105 if (lapb->n2count == lapb->n2) {
106 lapb_clear_queues(lapb);
107 lapb->state = LAPB_STATE_0;
108 lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
110 printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
115 if (lapb->mode & LAPB_EXTENDED) {
117 printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
119 lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
122 printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev);
124 lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
130 * Awaiting disconnection state, send DISC, up to N2 times.
133 if (lapb->n2count == lapb->n2) {
134 lapb_clear_queues(lapb);
135 lapb->state = LAPB_STATE_0;
136 lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
138 printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
144 printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
146 lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
151 * Data transfer state, restransmit I frames, up to N2 times.
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);
160 printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
165 lapb_requeue_frames(lapb);
170 * Frame reject state, restransmit FRMR frames, up to N2 times.
173 if (lapb->n2count == lapb->n2) {
174 lapb_clear_queues(lapb);
175 lapb->state = LAPB_STATE_0;
176 lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
178 printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
183 lapb_transmit_frmr(lapb);
188 lapb_start_t1timer(lapb);