Release 4.15 net/ax25/ax25_ds_subr.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/spinlock.h>
#include <linux/net.h>
#include <linux/gfp.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>



void ax25_ds_nr_error_recovery(ax25_cb *ax25)
{
	ax25_ds_establish_data_link(ax25);
}

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/*
 *      dl1bke 960114: transmit I frames on DAMA poll
 */


void ax25_ds_enquiry_response(ax25_cb *ax25)
{
	ax25_cb *ax25o;

	/* Please note that neither DK4EG's nor DG2FEF's
         * DAMA spec mention the following behaviour as seen
         * with TheFirmware:
         *
         *      DB0ACH->DL1BKE <RR C P R0> [DAMA]
         *      DL1BKE->DB0ACH <I NR=0 NS=0>
         *      DL1BKE-7->DB0PRA-6 DB0ACH <I C S3 R5>
         *      DL1BKE->DB0ACH <RR R F R0>
         *
         * The Flexnet DAMA Master implementation apparently
         * insists on the "proper" AX.25 behaviour:
         *
         *      DB0ACH->DL1BKE <RR C P R0> [DAMA]
         *      DL1BKE->DB0ACH <RR R F R0>
         *      DL1BKE->DB0ACH <I NR=0 NS=0>
         *      DL1BKE-7->DB0PRA-6 DB0ACH <I C S3 R5>
         *
         * Flexnet refuses to send us *any* I frame if we send
         * a REJ in case AX25_COND_REJECT is set. It is superfluous in
         * this mode anyway (a RR or RNR invokes the retransmission).
         * Is this a Flexnet bug?
         */

	ax25_std_enquiry_response(ax25);

	if (!(ax25->condition & AX25_COND_PEER_RX_BUSY)) {
		ax25_requeue_frames(ax25);
		ax25_kick(ax25);
	}

	if (ax25->state == AX25_STATE_1 || ax25->state == AX25_STATE_2 || skb_peek(&ax25->ack_queue) != NULL)
		ax25_ds_t1_timeout(ax25);
	else
		ax25->n2count = 0;

	ax25_start_t3timer(ax25);
	ax25_ds_set_timer(ax25->ax25_dev);

	spin_lock(&ax25_list_lock);
	ax25_for_each(ax25o, &ax25_list) {
		if (ax25o == ax25)
			continue;

		if (ax25o->ax25_dev != ax25->ax25_dev)
			continue;

		if (ax25o->state == AX25_STATE_1 || ax25o->state == AX25_STATE_2) {
			ax25_ds_t1_timeout(ax25o);
			continue;
		}

		if (!(ax25o->condition & AX25_COND_PEER_RX_BUSY) && ax25o->state == AX25_STATE_3) {
			ax25_requeue_frames(ax25o);
			ax25_kick(ax25o);
		}

		if (ax25o->state == AX25_STATE_1 || ax25o->state == AX25_STATE_2 || skb_peek(&ax25o->ack_queue) != NULL)
			ax25_ds_t1_timeout(ax25o);

		/* do not start T3 for listening sockets (tnx DD8NE) */

		if (ax25o->state != AX25_STATE_0)
			ax25_start_t3timer(ax25o);
	}
	spin_unlock(&ax25_list_lock);
}

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6
2.70%
1
14.29%
Jan Engelhardt
1
0.45%
1
14.29%
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222
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7
100.00%



void ax25_ds_establish_data_link(ax25_cb *ax25)
{
	ax25->condition &= AX25_COND_DAMA_MODE;
	ax25->n2count    = 0;
	ax25_calculate_t1(ax25);
	ax25_start_t1timer(ax25);
	ax25_stop_t2timer(ax25);
	ax25_start_t3timer(ax25);
}

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/*
 *      :::FIXME:::
 *      This is a kludge. Not all drivers recognize kiss commands.
 *      We need a driver level  request to switch duplex mode, that does
 *      either SCC changing, PI config or KISS as required. Currently
 *      this request isn't reliable.
 */


static void ax25_kiss_cmd(ax25_dev *ax25_dev, unsigned char cmd, unsigned char param)
{
	struct sk_buff *skb;
	unsigned char *p;

	if (ax25_dev->dev == NULL)
		return;

	if ((skb = alloc_skb(2, GFP_ATOMIC)) == NULL)
		return;

	skb_reset_network_header(skb);
	p = skb_put(skb, 2);

	*p++ = cmd;
	*p++ = param;

	skb->protocol = ax25_type_trans(skb, ax25_dev->dev);

	dev_queue_xmit(skb);
}

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/*
 *      A nasty problem arises if we count the number of DAMA connections
 *      wrong, especially when connections on the device already existed
 *      and our network node (or the sysop) decides to turn on DAMA Master
 *      mode. We thus flag the 'real' slave connections with
 *      ax25->dama_slave=1 and look on every disconnect if still slave
 *      connections exist.
 */


static int ax25_check_dama_slave(ax25_dev *ax25_dev)
{
	ax25_cb *ax25;
	int res = 0;

	spin_lock(&ax25_list_lock);
	ax25_for_each(ax25, &ax25_list)
		if (ax25->ax25_dev == ax25_dev && (ax25->condition & AX25_COND_DAMA_MODE) && ax25->state > AX25_STATE_1) {
			res = 1;
			break;
		}
	spin_unlock(&ax25_list_lock);

	return res;
}

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6
8.70%
1
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69
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5
100.00%



static void ax25_dev_dama_on(ax25_dev *ax25_dev)
{
	if (ax25_dev == NULL)
		return;

	if (ax25_dev->dama.slave == 0)
		ax25_kiss_cmd(ax25_dev, 5, 1);

	ax25_dev->dama.slave = 1;
	ax25_ds_set_timer(ax25_dev);
}

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2
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void ax25_dev_dama_off(ax25_dev *ax25_dev)
{
	if (ax25_dev == NULL)
		return;

	if (ax25_dev->dama.slave && !ax25_check_dama_slave(ax25_dev)) {
		ax25_kiss_cmd(ax25_dev, 5, 0);
		ax25_dev->dama.slave = 0;
		ax25_ds_del_timer(ax25_dev);
	}
}

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void ax25_dama_on(ax25_cb *ax25)
{
	ax25_dev_dama_on(ax25->ax25_dev);
	ax25->condition |= AX25_COND_DAMA_MODE;
}

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void ax25_dama_off(ax25_cb *ax25)
{
	ax25->condition &= ~AX25_COND_DAMA_MODE;
	ax25_dev_dama_off(ax25->ax25_dev);
}

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6.67%
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1.22%
2
13.33%
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1
6.67%
Jan Engelhardt
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0.15%
1
6.67%
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Directory: net/ax25

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