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![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
189 lines
4.5 KiB
C
189 lines
4.5 KiB
C
/*
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* LAPB release 002
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*
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* History
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* LAPB 001 Jonathan Naylor Started Coding
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* LAPB 002 Jonathan Naylor New timer architecture.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/inet.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <net/lapb.h>
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static void lapb_t1timer_expiry(unsigned long);
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static void lapb_t2timer_expiry(unsigned long);
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void lapb_start_t1timer(struct lapb_cb *lapb)
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{
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del_timer(&lapb->t1timer);
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lapb->t1timer.data = (unsigned long)lapb;
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lapb->t1timer.function = &lapb_t1timer_expiry;
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lapb->t1timer.expires = jiffies + lapb->t1;
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add_timer(&lapb->t1timer);
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}
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void lapb_start_t2timer(struct lapb_cb *lapb)
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{
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del_timer(&lapb->t2timer);
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lapb->t2timer.data = (unsigned long)lapb;
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lapb->t2timer.function = &lapb_t2timer_expiry;
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lapb->t2timer.expires = jiffies + lapb->t2;
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add_timer(&lapb->t2timer);
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}
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void lapb_stop_t1timer(struct lapb_cb *lapb)
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{
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del_timer(&lapb->t1timer);
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}
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void lapb_stop_t2timer(struct lapb_cb *lapb)
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{
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del_timer(&lapb->t2timer);
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}
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int lapb_t1timer_running(struct lapb_cb *lapb)
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{
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return timer_pending(&lapb->t1timer);
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}
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static void lapb_t2timer_expiry(unsigned long param)
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{
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struct lapb_cb *lapb = (struct lapb_cb *)param;
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if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
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lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
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lapb_timeout_response(lapb);
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}
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}
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static void lapb_t1timer_expiry(unsigned long param)
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{
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struct lapb_cb *lapb = (struct lapb_cb *)param;
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switch (lapb->state) {
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/*
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* If we are a DCE, keep going DM .. DM .. DM
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*/
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case LAPB_STATE_0:
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if (lapb->mode & LAPB_DCE)
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lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
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break;
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/*
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* Awaiting connection state, send SABM(E), up to N2 times.
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*/
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case LAPB_STATE_1:
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if (lapb->n2count == lapb->n2) {
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lapb_clear_queues(lapb);
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lapb->state = LAPB_STATE_0;
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lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
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#if LAPB_DEBUG > 0
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printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->dev);
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#endif
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return;
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} else {
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lapb->n2count++;
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if (lapb->mode & LAPB_EXTENDED) {
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#if LAPB_DEBUG > 1
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printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->dev);
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#endif
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lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
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} else {
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#if LAPB_DEBUG > 1
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printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->dev);
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#endif
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lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
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}
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}
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break;
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/*
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* Awaiting disconnection state, send DISC, up to N2 times.
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*/
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case LAPB_STATE_2:
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if (lapb->n2count == lapb->n2) {
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lapb_clear_queues(lapb);
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lapb->state = LAPB_STATE_0;
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lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
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#if LAPB_DEBUG > 0
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printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->dev);
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#endif
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return;
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} else {
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lapb->n2count++;
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#if LAPB_DEBUG > 1
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printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->dev);
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#endif
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lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
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}
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break;
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/*
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* Data transfer state, restransmit I frames, up to N2 times.
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*/
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case LAPB_STATE_3:
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if (lapb->n2count == lapb->n2) {
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lapb_clear_queues(lapb);
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lapb->state = LAPB_STATE_0;
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lapb_stop_t2timer(lapb);
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lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
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#if LAPB_DEBUG > 0
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printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->dev);
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#endif
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return;
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} else {
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lapb->n2count++;
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lapb_requeue_frames(lapb);
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}
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break;
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/*
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* Frame reject state, restransmit FRMR frames, up to N2 times.
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*/
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case LAPB_STATE_4:
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if (lapb->n2count == lapb->n2) {
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lapb_clear_queues(lapb);
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lapb->state = LAPB_STATE_0;
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lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
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#if LAPB_DEBUG > 0
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printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->dev);
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#endif
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return;
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} else {
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lapb->n2count++;
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lapb_transmit_frmr(lapb);
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}
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break;
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}
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lapb_start_t1timer(lapb);
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}
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