Release 4.15 net/x25/x25_link.c

/*
 *      X.25 Packet Layer release 002
 *
 *      This is ALPHA test software. This code may break your machine,
 *      randomly fail to work with new releases, misbehave and/or generally
 *      screw up. It might even work.
 *
 *      This code REQUIRES 2.1.15 or higher
 *
 *      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
 *      X.25 001        Jonathan Naylor   Started coding.
 *      X.25 002        Jonathan Naylor   New timer architecture.
 *      mar/20/00       Daniela Squassoni Disabling/enabling of facilities
 *                                        negotiation.
 *      2000-09-04      Henner Eisen      dev_hold() / dev_put() for x25_neigh.
 */


#define pr_fmt(fmt) "X25: " fmt

#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/uaccess.h>
#include <linux/init.h>
#include <net/x25.h>


LIST_HEAD(x25_neigh_list);

DEFINE_RWLOCK(x25_neigh_list_lock);

static void x25_t20timer_expiry(struct timer_list *);

static void x25_transmit_restart_confirmation(struct x25_neigh *nb);
static void x25_transmit_restart_request(struct x25_neigh *nb);

/*
 *      Linux set/reset timer routines
 */


static inline void x25_start_t20timer(struct x25_neigh *nb)
{
	mod_timer(&nb->t20timer, jiffies + nb->t20);
}

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20
76.92%
2
50.00%
Vinay K. Nallamothu
3
11.54%
1
25.00%
Arnaldo Carvalho de Melo
3
11.54%
1
25.00%
Total
26
100.00%
4
100.00%



static void x25_t20timer_expiry(struct timer_list *t)
{
	struct x25_neigh *nb = from_timer(nb, t, t20timer);

	x25_transmit_restart_request(nb);

	x25_start_t20timer(nb);
}

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57.14%
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Kees Cook
12
34.29%
1
25.00%
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3
8.57%
1
25.00%
Total
35
100.00%
4
100.00%



static inline void x25_stop_t20timer(struct x25_neigh *nb)
{
	del_timer(&nb->t20timer);
}

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2
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2
10.00%
1
25.00%
Vinay K. Nallamothu
1
5.00%
1
25.00%
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20
100.00%
4
100.00%



static inline int x25_t20timer_pending(struct x25_neigh *nb)
{
	return timer_pending(&nb->t20timer);
}

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18
85.71%
1
33.33%
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2
9.52%
1
33.33%
Vinay K. Nallamothu
1
4.76%
1
33.33%
Total
21
100.00%
3
100.00%

/*
 *      This handles all restart and diagnostic frames.
 */


void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
		      unsigned short frametype)
{
	struct sk_buff *skbn;
	int confirm;

	switch (frametype) {
	case X25_RESTART_REQUEST:
		confirm = !x25_t20timer_pending(nb);
		x25_stop_t20timer(nb);
		nb->state = X25_LINK_STATE_3;
		if (confirm)
			x25_transmit_restart_confirmation(nb);
		break;

	case X25_RESTART_CONFIRMATION:
		x25_stop_t20timer(nb);
		nb->state = X25_LINK_STATE_3;
		break;

	case X25_DIAGNOSTIC:
		if (!pskb_may_pull(skb, X25_STD_MIN_LEN + 4))
			break;

		pr_warn("diagnostic #%d - %02X %02X %02X\n",
		       skb->data[3], skb->data[4],
		       skb->data[5], skb->data[6]);
		break;

	default:
		pr_warn("received unknown %02X with LCI 000\n",
		       frametype);
		break;
	}

	if (nb->state == X25_LINK_STATE_3)
		while ((skbn = skb_dequeue(&nb->queue)) != NULL)
			x25_send_frame(skbn, nb);
}

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Linus Torvalds (pre-git)
143
84.12%
5
62.50%
Matthew Daley
13
7.65%
1
12.50%
Arnaldo Carvalho de Melo
10
5.88%
1
12.50%
Wang Weidong
4
2.35%
1
12.50%
Total
170
100.00%
8
100.00%

/*
 *      This routine is called when a Restart Request is needed
 */


static void x25_transmit_restart_request(struct x25_neigh *nb)
{
	unsigned char *dptr;
	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);

	if (!skb)
		return;

	skb_reserve(skb, X25_MAX_L2_LEN);

	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);

	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	*dptr++ = 0x00;
	*dptr++ = X25_RESTART_REQUEST;
	*dptr++ = 0x00;
	*dptr++ = 0;

	skb->sk = NULL;

	x25_send_frame(skb, nb);
}

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Linus Torvalds (pre-git)
95
86.36%
1
25.00%
Arnaldo Carvalho de Melo
14
12.73%
2
50.00%
Adrian Bunk
1
0.91%
1
25.00%
Total
110
100.00%
4
100.00%

/*
 * This routine is called when a Restart Confirmation is needed
 */


static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
{
	unsigned char *dptr;
	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN;
	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);

	if (!skb)
		return;

	skb_reserve(skb, X25_MAX_L2_LEN);

	dptr = skb_put(skb, X25_STD_MIN_LEN);

	*dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
	*dptr++ = 0x00;
	*dptr++ = X25_RESTART_CONFIRMATION;

	skb->sk = NULL;

	x25_send_frame(skb, nb);
}

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79
84.04%
1
25.00%
Arnaldo Carvalho de Melo
14
14.89%
2
50.00%
Adrian Bunk
1
1.06%
1
25.00%
Total
94
100.00%
4
100.00%

/*
 *      This routine is called when a Clear Request is needed outside of the context
 *      of a connected socket.
 */


void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
				unsigned char cause)
{
	unsigned char *dptr;
	int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
	struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);

	if (!skb)
		return;

	skb_reserve(skb, X25_MAX_L2_LEN);

	dptr = skb_put(skb, X25_STD_MIN_LEN + 2);

	*dptr++ = ((lci >> 8) & 0x0F) | (nb->extended ?
					 X25_GFI_EXTSEQ :
					 X25_GFI_STDSEQ);
	*dptr++ = (lci >> 0) & 0xFF;
	*dptr++ = X25_CLEAR_REQUEST;
	*dptr++ = cause;
	*dptr++ = 0x00;

	skb->sk = NULL;

	x25_send_frame(skb, nb);
}

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Linus Torvalds (pre-git)
119
88.15%
1
25.00%
Arnaldo Carvalho de Melo
14
10.37%
2
50.00%
Rusty Russell
2
1.48%
1
25.00%
Total
135
100.00%
4
100.00%



void x25_transmit_link(struct sk_buff *skb, struct x25_neigh *nb)
{
	switch (nb->state) {
	case X25_LINK_STATE_0:
		skb_queue_tail(&nb->queue, skb);
		nb->state = X25_LINK_STATE_1;
		x25_establish_link(nb);
		break;
	case X25_LINK_STATE_1:
	case X25_LINK_STATE_2:
		skb_queue_tail(&nb->queue, skb);
		break;
	case X25_LINK_STATE_3:
		x25_send_frame(skb, nb);
		break;
	}
}

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Linus Torvalds (pre-git)
69
90.79%
2
66.67%
Arnaldo Carvalho de Melo
7
9.21%
1
33.33%
Total
76
100.00%
3
100.00%

/*
 *      Called when the link layer has become established.
 */


void x25_link_established(struct x25_neigh *nb)
{
	switch (nb->state) {
	case X25_LINK_STATE_0:
		nb->state = X25_LINK_STATE_2;
		break;
	case X25_LINK_STATE_1:
		x25_transmit_restart_request(nb);
		nb->state = X25_LINK_STATE_2;
		x25_start_t20timer(nb);
		break;
	}
}

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Linus Torvalds (pre-git)
42
87.50%
3
75.00%
Arnaldo Carvalho de Melo
6
12.50%
1
25.00%
Total
48
100.00%
4
100.00%

/*
 *      Called when the link layer has terminated, or an establishment
 *      request has failed.
 */



void x25_link_terminated(struct x25_neigh *nb)
{
	nb->state = X25_LINK_STATE_0;
	/* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
	x25_kill_by_neigh(nb);
}

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Linus Torvalds (pre-git)
19
86.36%
3
75.00%
Arnaldo Carvalho de Melo
3
13.64%
1
25.00%
Total
22
100.00%
4
100.00%

/*
 *      Add a new device.
 */


void x25_link_device_up(struct net_device *dev)
{
	struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC);

	if (!nb)
		return;

	skb_queue_head_init(&nb->queue);
	timer_setup(&nb->t20timer, x25_t20timer_expiry, 0);

	dev_hold(dev);
	nb->dev      = dev;
	nb->state    = X25_LINK_STATE_0;
	nb->extended = 0;
	/*
         * Enables negotiation
         */
	nb->global_facil_mask = X25_MASK_REVERSE |
				       X25_MASK_THROUGHPUT |
				       X25_MASK_PACKET_SIZE |
				       X25_MASK_WINDOW_SIZE;
	nb->t20      = sysctl_x25_restart_request_timeout;
	refcount_set(&nb->refcnt, 1);

	write_lock_bh(&x25_neigh_list_lock);
	list_add(&nb->node, &x25_neigh_list);
	write_unlock_bh(&x25_neigh_list_lock);
}

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Linus Torvalds (pre-git)
79
62.20%
6
50.00%
Arnaldo Carvalho de Melo
40
31.50%
2
16.67%
Pavel Emelyanov
4
3.15%
1
8.33%
Kees Cook
2
1.57%
1
8.33%
Vinay K. Nallamothu
1
0.79%
1
8.33%
Elena Reshetova
1
0.79%
1
8.33%
Total
127
100.00%
12
100.00%

/**
 *      __x25_remove_neigh - remove neighbour from x25_neigh_list
 *      @nb - neigh to remove
 *
 *      Remove neighbour from x25_neigh_list. If it was there.
 *      Caller must hold x25_neigh_list_lock.
 */


static void __x25_remove_neigh(struct x25_neigh *nb)
{
	skb_queue_purge(&nb->queue);
	x25_stop_t20timer(nb);

	if (nb->node.next) {
		list_del(&nb->node);
		x25_neigh_put(nb);
	}
}

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28
59.57%
2
40.00%
Arnaldo Carvalho de Melo
18
38.30%
2
40.00%
Linus Torvalds
1
2.13%
1
20.00%
Total
47
100.00%
5
100.00%

/*
 *      A device has been removed, remove its links.
 */


void x25_link_device_down(struct net_device *dev)
{
	struct x25_neigh *nb;
	struct list_head *entry, *tmp;

	write_lock_bh(&x25_neigh_list_lock);

	list_for_each_safe(entry, tmp, &x25_neigh_list) {
		nb = list_entry(entry, struct x25_neigh, node);

		if (nb->dev == dev) {
			__x25_remove_neigh(nb);
			dev_put(dev);
		}
	}

	write_unlock_bh(&x25_neigh_list_lock);
}

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50.65%
1
25.00%
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38
49.35%
3
75.00%
Total
77
100.00%
4
100.00%

/*
 *      Given a device, return the neighbour address.
 */


struct x25_neigh *x25_get_neigh(struct net_device *dev)
{
	struct x25_neigh *nb, *use = NULL;
	struct list_head *entry;

	read_lock_bh(&x25_neigh_list_lock);
	list_for_each(entry, &x25_neigh_list) {
		nb = list_entry(entry, struct x25_neigh, node);

		if (nb->dev == dev) {
			use = nb;
			break;
		}
	}

	if (use)
		x25_neigh_hold(use);
	read_unlock_bh(&x25_neigh_list_lock);
	return use;
}

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59
68.60%
2
50.00%
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27
31.40%
2
50.00%
Total
86
100.00%
4
100.00%

/*
 *      Handle the ioctls that control the subscription functions.
 */


int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
{
	struct x25_subscrip_struct x25_subscr;
	struct x25_neigh *nb;
	struct net_device *dev;
	int rc = -EINVAL;

	if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP)
		goto out;

	rc = -EFAULT;
	if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr)))
		goto out;

	rc = -EINVAL;
	if ((dev = x25_dev_get(x25_subscr.device)) == NULL)
		goto out;

	if ((nb = x25_get_neigh(dev)) == NULL)
		goto out_dev_put;

	dev_put(dev);

	if (cmd == SIOCX25GSUBSCRIP) {
		read_lock_bh(&x25_neigh_list_lock);
		x25_subscr.extended	     = nb->extended;
		x25_subscr.global_facil_mask = nb->global_facil_mask;
		read_unlock_bh(&x25_neigh_list_lock);
		rc = copy_to_user(arg, &x25_subscr,
				  sizeof(x25_subscr)) ? -EFAULT : 0;
	} else {
		rc = -EINVAL;
		if (!(x25_subscr.extended && x25_subscr.extended != 1)) {
			rc = 0;
			write_lock_bh(&x25_neigh_list_lock);
			nb->extended	     = x25_subscr.extended;
			nb->global_facil_mask = x25_subscr.global_facil_mask;
			write_unlock_bh(&x25_neigh_list_lock);
		}
	}
	x25_neigh_put(nb);
out:
	return rc;
out_dev_put:
	dev_put(dev);
	goto out;
}


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6
60.00%
Arnaldo Carvalho de Melo
85
34.41%
2
20.00%
Andrew Hendry
24
9.72%
1
10.00%
Al Viro
1
0.40%
1
10.00%
Total
247
100.00%
10
100.00%

/*
 *      Release all memory associated with X.25 neighbour structures.
 */


void __exit x25_link_free(void)
{
	struct x25_neigh *nb;
	struct list_head *entry, *tmp;

	write_lock_bh(&x25_neigh_list_lock);

	list_for_each_safe(entry, tmp, &x25_neigh_list) {
		struct net_device *dev;

		nb = list_entry(entry, struct x25_neigh, node);
		dev = nb->dev;
		__x25_remove_neigh(nb);
		dev_put(dev);
	}
	write_unlock_bh(&x25_neigh_list_lock);
}
Contributors
Person
Tokens
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Commits
CommitProp
Arnaldo Carvalho de Melo
38
50.00%
1
20.00%
Linus Torvalds (pre-git)
21
27.63%
1
20.00%
David S. Miller
11
14.47%
1
20.00%
Apollon Oikonomopoulos
5
6.58%
1
20.00%
Linus Torvalds
1
1.32%
1
20.00%
Total
76
100.00%
5
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1009
67.09%
11
33.33%
Arnaldo Carvalho de Melo
361
24.00%
2
6.06%
Andrew Hendry
24
1.60%
1
3.03%
Adrian Bunk
22
1.46%
1
3.03%
Kees Cook
17
1.13%
1
3.03%
Matthew Daley
13
0.86%
1
3.03%
Wang Weidong
11
0.73%
1
3.03%
David S. Miller
11
0.73%
1
3.03%
Vinay K. Nallamothu
6
0.40%
1
3.03%
Linus Torvalds
6
0.40%
3
9.09%
Apollon Oikonomopoulos
5
0.33%
1
3.03%
Pavel Emelyanov
4
0.27%
1
3.03%
Thomas Gleixner
4
0.27%
1
3.03%
Tejun Heo
3
0.20%
1
3.03%
Rusty Russell
3
0.20%
2
6.06%
Cheng Renquan
2
0.13%
1
3.03%
Elena Reshetova
1
0.07%
1
3.03%
Al Viro
1
0.07%
1
3.03%
Hideaki Yoshifuji / 吉藤英明
1
0.07%
1
3.03%
Total
1504
100.00%
33
100.00%
Directory: net/x25

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