Release 4.14 net/lapb/lapb_iface.c

/*
 *      LAPB release 002
 *
 *      This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *      This module:
 *              This module 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.
 *
 *      History
 *      LAPB 001        Jonathan Naylor Started Coding
 *      LAPB 002        Jonathan Naylor New timer architecture.
 *      2000-10-29      Henner Eisen    lapb_data_indication() return status.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <net/lapb.h>

static LIST_HEAD(lapb_list);
static DEFINE_RWLOCK(lapb_list_lock);

/*
 *      Free an allocated lapb control block.
 */


static void lapb_free_cb(struct lapb_cb *lapb)
{
	kfree(lapb);
}

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static __inline__ void lapb_hold(struct lapb_cb *lapb)
{
	refcount_inc(&lapb->refcnt);
}

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8
40.00%
1
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1
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static __inline__ void lapb_put(struct lapb_cb *lapb)
{
	if (refcount_dec_and_test(&lapb->refcnt))
		lapb_free_cb(lapb);
}

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1
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/*
 *      Socket removal during an interrupt is now safe.
 */


static void __lapb_remove_cb(struct lapb_cb *lapb)
{
	if (lapb->node.next) {
		list_del(&lapb->node);
		lapb_put(lapb);
	}
}
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EXPORT_SYMBOL(lapb_register);

/*
 *      Add a socket to the bound sockets list.
 */


static void __lapb_insert_cb(struct lapb_cb *lapb)
{
	list_add(&lapb->node, &lapb_list);
	lapb_hold(lapb);
}

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37.04%
1
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27
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static struct lapb_cb *__lapb_devtostruct(struct net_device *dev)
{
	struct list_head *entry;
	struct lapb_cb *lapb, *use = NULL;

	list_for_each(entry, &lapb_list) {
		lapb = list_entry(entry, struct lapb_cb, node);
		if (lapb->dev == dev) {
			use = lapb;
			break;
		}
	}

	if (use)
		lapb_hold(use);

	return use;
}

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28.00%
2
50.00%
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6
8.00%
1
25.00%
Total
75
100.00%
4
100.00%



static struct lapb_cb *lapb_devtostruct(struct net_device *dev)
{
	struct lapb_cb *rc;

	read_lock_bh(&lapb_list_lock);
	rc = __lapb_devtostruct(dev);
	read_unlock_bh(&lapb_list_lock);

	return rc;
}
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6
15.00%
1
33.33%
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3
7.50%
1
33.33%
Total
40
100.00%
3
100.00%

/*
 *      Create an empty LAPB control block.
 */


static struct lapb_cb *lapb_create_cb(void)
{
	struct lapb_cb *lapb = kzalloc(sizeof(*lapb), GFP_ATOMIC);


	if (!lapb)
		goto out;

	skb_queue_head_init(&lapb->write_queue);
	skb_queue_head_init(&lapb->ack_queue);

	init_timer(&lapb->t1timer);
	init_timer(&lapb->t2timer);

	lapb->t1      = LAPB_DEFAULT_T1;
	lapb->t2      = LAPB_DEFAULT_T2;
	lapb->n2      = LAPB_DEFAULT_N2;
	lapb->mode    = LAPB_DEFAULT_MODE;
	lapb->window  = LAPB_DEFAULT_WINDOW;
	lapb->state   = LAPB_STATE_0;
	refcount_set(&lapb->refcnt, 1);
out:
	return lapb;
}

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3
50.00%
Arnaldo Carvalho de Melo
22
18.80%
1
16.67%
Elena Reshetova
1
0.85%
1
16.67%
Panagiotis Issaris
1
0.85%
1
16.67%
Total
117
100.00%
6
100.00%



int lapb_register(struct net_device *dev,
		  const struct lapb_register_struct *callbacks)
{
	struct lapb_cb *lapb;
	int rc = LAPB_BADTOKEN;

	write_lock_bh(&lapb_list_lock);

	lapb = __lapb_devtostruct(dev);
	if (lapb) {
		lapb_put(lapb);
		goto out;
	}

	lapb = lapb_create_cb();
	rc = LAPB_NOMEM;
	if (!lapb)
		goto out;

	lapb->dev       = dev;
	lapb->callbacks = callbacks;

	__lapb_insert_cb(lapb);

	lapb_start_t1timer(lapb);

	rc = LAPB_OK;
out:
	write_unlock_bh(&lapb_list_lock);
	return rc;
}

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37.38%
3
42.86%
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13
12.15%
2
28.57%
Stephen Hemminger
1
0.93%
1
14.29%
Total
107
100.00%
7
100.00%



int lapb_unregister(struct net_device *dev)
{
	struct lapb_cb *lapb;
	int rc = LAPB_BADTOKEN;

	write_lock_bh(&lapb_list_lock);
	lapb = __lapb_devtostruct(dev);
	if (!lapb)
		goto out;

	lapb_stop_t1timer(lapb);
	lapb_stop_t2timer(lapb);

	lapb_clear_queues(lapb);

	__lapb_remove_cb(lapb);

	lapb_put(lapb);
	rc = LAPB_OK;
out:
	write_unlock_bh(&lapb_list_lock);
	return rc;
}
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50.00%
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34
41.98%
1
16.67%
Al Viro
5
6.17%
1
16.67%
Andrew Morton
1
1.23%
1
16.67%
Total
81
100.00%
6
100.00%


EXPORT_SYMBOL(lapb_unregister);



int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms)
{
	int rc = LAPB_BADTOKEN;
	struct lapb_cb *lapb = lapb_devtostruct(dev);

	if (!lapb)
		goto out;

	parms->t1      = lapb->t1 / HZ;
	parms->t2      = lapb->t2 / HZ;
	parms->n2      = lapb->n2;
	parms->n2count = lapb->n2count;
	parms->state   = lapb->state;
	parms->window  = lapb->window;
	parms->mode    = lapb->mode;

	if (!timer_pending(&lapb->t1timer))
		parms->t1timer = 0;
	else
		parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;

	if (!timer_pending(&lapb->t2timer))
		parms->t2timer = 0;
	else
		parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;

	lapb_put(lapb);
	rc = LAPB_OK;
out:
	return rc;
}
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60.00%
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27
15.00%
1
20.00%
Al Viro
5
2.78%
1
20.00%
Total
180
100.00%
5
100.00%


EXPORT_SYMBOL(lapb_getparms);



int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms)
{
	int rc = LAPB_BADTOKEN;
	struct lapb_cb *lapb = lapb_devtostruct(dev);

	if (!lapb)
		goto out;

	rc = LAPB_INVALUE;
	if (parms->t1 < 1 || parms->t2 < 1 || parms->n2 < 1)
		goto out_put;

	if (lapb->state == LAPB_STATE_0) {
		if (parms->mode & LAPB_EXTENDED) {
			if (parms->window < 1 || parms->window > 127)
				goto out_put;
		} else {
			if (parms->window < 1 || parms->window > 7)
				goto out_put;
		}
		lapb->mode    = parms->mode;
		lapb->window  = parms->window;
	}

	lapb->t1    = parms->t1 * HZ;
	lapb->t2    = parms->t2 * HZ;
	lapb->n2    = parms->n2;

	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}
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40.00%
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41
22.53%
1
20.00%
Diego Calleja García
14
7.69%
1
20.00%
Al Viro
5
2.75%
1
20.00%
Total
182
100.00%
5
100.00%


EXPORT_SYMBOL(lapb_setparms);



int lapb_connect_request(struct net_device *dev)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (!lapb)
		goto out;

	rc = LAPB_OK;
	if (lapb->state == LAPB_STATE_1)
		goto out_put;

	rc = LAPB_CONNECTED;
	if (lapb->state == LAPB_STATE_3 || lapb->state == LAPB_STATE_4)
		goto out_put;

	lapb_establish_data_link(lapb);

	lapb_dbg(0, "(%p) S0 -> S1\n", lapb->dev);
	lapb->state = LAPB_STATE_1;

	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}
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42
39.25%
1
20.00%
Al Viro
6
5.61%
2
40.00%
Joe Perches
4
3.74%
1
20.00%
Total
107
100.00%
5
100.00%


EXPORT_SYMBOL(lapb_connect_request);



int lapb_disconnect_request(struct net_device *dev)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (!lapb)
		goto out;

	switch (lapb->state) {
	case LAPB_STATE_0:
		rc = LAPB_NOTCONNECTED;
		goto out_put;

	case LAPB_STATE_1:
		lapb_dbg(1, "(%p) S1 TX DISC(1)\n", lapb->dev);
		lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
		lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
		lapb->state = LAPB_STATE_0;
		lapb_start_t1timer(lapb);
		rc = LAPB_NOTCONNECTED;
		goto out_put;

	case LAPB_STATE_2:
		rc = LAPB_OK;
		goto out_put;
	}

	lapb_clear_queues(lapb);
	lapb->n2count = 0;
	lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
	lapb_start_t1timer(lapb);
	lapb_stop_t2timer(lapb);
	lapb->state = LAPB_STATE_2;

	lapb_dbg(1, "(%p) S3 DISC(1)\n", lapb->dev);
	lapb_dbg(0, "(%p) S3 -> S2\n", lapb->dev);

	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}
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33.33%
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47
24.61%
1
16.67%
Joe Perches
16
8.38%
1
16.67%
Al Viro
9
4.71%
2
33.33%
Total
191
100.00%
6
100.00%


EXPORT_SYMBOL(lapb_disconnect_request);



int lapb_data_request(struct net_device *dev, struct sk_buff *skb)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (!lapb)
		goto out;

	rc = LAPB_NOTCONNECTED;
	if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
		goto out_put;

	skb_queue_tail(&lapb->write_queue, skb);
	lapb_kick(lapb);
	rc = LAPB_OK;
out_put:
	lapb_put(lapb);
out:
	return rc;
}
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1
33.33%
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36
40.00%
1
33.33%
Al Viro
5
5.56%
1
33.33%
Total
90
100.00%
3
100.00%


EXPORT_SYMBOL(lapb_data_request);



int lapb_data_received(struct net_device *dev, struct sk_buff *skb)
{
	struct lapb_cb *lapb = lapb_devtostruct(dev);
	int rc = LAPB_BADTOKEN;

	if (lapb) {
		lapb_data_input(lapb, skb);
		lapb_put(lapb);
		rc = LAPB_OK;
	}

	return rc;
}
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27
49.09%
2
50.00%
Arnaldo Carvalho de Melo
23
41.82%
1
25.00%
Al Viro
5
9.09%
1
25.00%
Total
55
100.00%
4
100.00%


EXPORT_SYMBOL(lapb_data_received);



void lapb_connect_confirmation(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks->connect_confirmation)
		lapb->callbacks->connect_confirmation(lapb->dev, reason);
}

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Linus Torvalds (pre-git)
30
88.24%
1
25.00%
Stephen Hemminger
2
5.88%
1
25.00%
Al Viro
1
2.94%
1
25.00%
Arnaldo Carvalho de Melo
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%



void lapb_connect_indication(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks->connect_indication)
		lapb->callbacks->connect_indication(lapb->dev, reason);
}

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Linus Torvalds (pre-git)
30
88.24%
1
25.00%
Stephen Hemminger
2
5.88%
1
25.00%
Al Viro
1
2.94%
1
25.00%
Arnaldo Carvalho de Melo
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%



void lapb_disconnect_confirmation(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks->disconnect_confirmation)
		lapb->callbacks->disconnect_confirmation(lapb->dev, reason);
}

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Linus Torvalds (pre-git)
30
88.24%
1
25.00%
Stephen Hemminger
2
5.88%
1
25.00%
Arnaldo Carvalho de Melo
1
2.94%
1
25.00%
Al Viro
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%



void lapb_disconnect_indication(struct lapb_cb *lapb, int reason)
{
	if (lapb->callbacks->disconnect_indication)
		lapb->callbacks->disconnect_indication(lapb->dev, reason);
}

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Linus Torvalds (pre-git)
30
88.24%
1
25.00%
Stephen Hemminger
2
5.88%
1
25.00%
Arnaldo Carvalho de Melo
1
2.94%
1
25.00%
Al Viro
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%



int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *skb)
{
	if (lapb->callbacks->data_indication)
		return lapb->callbacks->data_indication(lapb->dev, skb);

	kfree_skb(skb);
	return NET_RX_SUCCESS; /* For now; must be != NET_RX_DROP */
}

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Linus Torvalds (pre-git)
41
89.13%
2
33.33%
Stephen Hemminger
2
4.35%
1
16.67%
Florian Westphal
1
2.17%
1
16.67%
Al Viro
1
2.17%
1
16.67%
Arnaldo Carvalho de Melo
1
2.17%
1
16.67%
Total
46
100.00%
6
100.00%



int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *skb)
{
	int used = 0;

	if (lapb->callbacks->data_transmit) {
		lapb->callbacks->data_transmit(lapb->dev, skb);
		used = 1;
	}

	return used;
}

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Linus Torvalds (pre-git)
46
92.00%
1
25.00%
Stephen Hemminger
2
4.00%
1
25.00%
Arnaldo Carvalho de Melo
1
2.00%
1
25.00%
Al Viro
1
2.00%
1
25.00%
Total
50
100.00%
4
100.00%



static int __init lapb_init(void)
{
	return 0;
}

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3
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12
100.00%
3
100.00%



static void __exit lapb_exit(void)
{
	WARN_ON(!list_empty(&lapb_list));
}

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1
100.00%
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19
100.00%
1
100.00%

MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
MODULE_LICENSE("GPL");


module_init(lapb_init);

module_exit(lapb_exit);
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Linus Torvalds (pre-git)
1074
60.68%
10
33.33%
Arnaldo Carvalho de Melo
484
27.34%
1
3.33%
Al Viro
71
4.01%
3
10.00%
Fabian Frederick
40
2.26%
1
3.33%
Stephen Hemminger
37
2.09%
2
6.67%
Joe Perches
27
1.53%
1
3.33%
Diego Calleja García
14
0.79%
1
3.33%
Dave Jones
5
0.28%
1
3.33%
Thomas Gleixner
4
0.23%
1
3.33%
Tejun Heo
3
0.17%
1
3.33%
Elena Reshetova
3
0.17%
1
3.33%
Cheng Renquan
2
0.11%
1
3.33%
Andrew Morton
1
0.06%
1
3.33%
Rusty Russell
1
0.06%
1
3.33%
Panagiotis Issaris
1
0.06%
1
3.33%
Florian Westphal
1
0.06%
1
3.33%
Hideaki Yoshifuji / 吉藤英明
1
0.06%
1
3.33%
Linus Torvalds
1
0.06%
1
3.33%
Total
1770
100.00%
30
100.00%
Directory: net/lapb

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