Release 4.11 net/rose/rose_route.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) Terry Dawson VK2KTJ (terry@animats.net)
 */
#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/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/arp.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/termios.h>	/* For TIOCINQ/OUTQ */
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/init.h>
#include <net/rose.h>
#include <linux/seq_file.h>
#include <linux/export.h>


static unsigned int rose_neigh_no = 1;


static struct rose_node  *rose_node_list;
static DEFINE_SPINLOCK(rose_node_list_lock);

static struct rose_neigh *rose_neigh_list;
static DEFINE_SPINLOCK(rose_neigh_list_lock);

static struct rose_route *rose_route_list;
static DEFINE_SPINLOCK(rose_route_list_lock);


struct rose_neigh *rose_loopback_neigh;

/*
 *      Add a new route to a node, and in the process add the node and the
 *      neighbour if it is new.
 */


static int __must_check rose_add_node(struct rose_route_struct *rose_route,
	struct net_device *dev)
{
	struct rose_node  *rose_node, *rose_tmpn, *rose_tmpp;
	struct rose_neigh *rose_neigh;
	int i, res = 0;

	spin_lock_bh(&rose_node_list_lock);
	spin_lock_bh(&rose_neigh_list_lock);

	rose_node = rose_node_list;
	while (rose_node != NULL) {
		if ((rose_node->mask == rose_route->mask) &&
		    (rosecmpm(&rose_route->address, &rose_node->address,
			      rose_route->mask) == 0))
			break;
		rose_node = rose_node->next;
	}

	if (rose_node != NULL && rose_node->loopback) {
		res = -EINVAL;
		goto out;
	}

	rose_neigh = rose_neigh_list;
	while (rose_neigh != NULL) {
		if (ax25cmp(&rose_route->neighbour,
			    &rose_neigh->callsign) == 0 &&
		    rose_neigh->dev == dev)
			break;
		rose_neigh = rose_neigh->next;
	}

	if (rose_neigh == NULL) {
		rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
		if (rose_neigh == NULL) {
			res = -ENOMEM;
			goto out;
		}

		rose_neigh->callsign  = rose_route->neighbour;
		rose_neigh->digipeat  = NULL;
		rose_neigh->ax25      = NULL;
		rose_neigh->dev       = dev;
		rose_neigh->count     = 0;
		rose_neigh->use       = 0;
		rose_neigh->dce_mode  = 0;
		rose_neigh->loopback  = 0;
		rose_neigh->number    = rose_neigh_no++;
		rose_neigh->restarted = 0;

		skb_queue_head_init(&rose_neigh->queue);

		init_timer(&rose_neigh->ftimer);
		init_timer(&rose_neigh->t0timer);

		if (rose_route->ndigis != 0) {
			rose_neigh->digipeat =
				kmalloc(sizeof(ax25_digi), GFP_ATOMIC);
			if (rose_neigh->digipeat == NULL) {
				kfree(rose_neigh);
				res = -ENOMEM;
				goto out;
			}

			rose_neigh->digipeat->ndigi      = rose_route->ndigis;
			rose_neigh->digipeat->lastrepeat = -1;

			for (i = 0; i < rose_route->ndigis; i++) {
				rose_neigh->digipeat->calls[i]    =
					rose_route->digipeaters[i];
				rose_neigh->digipeat->repeated[i] = 0;
			}
		}

		rose_neigh->next = rose_neigh_list;
		rose_neigh_list  = rose_neigh;
	}

	/*
         * This is a new node to be inserted into the list. Find where it needs
         * to be inserted into the list, and insert it. We want to be sure
         * to order the list in descending order of mask size to ensure that
         * later when we are searching this list the first match will be the
         * best match.
         */
	if (rose_node == NULL) {
		rose_tmpn = rose_node_list;
		rose_tmpp = NULL;

		while (rose_tmpn != NULL) {
			if (rose_tmpn->mask > rose_route->mask) {
				rose_tmpp = rose_tmpn;
				rose_tmpn = rose_tmpn->next;
			} else {
				break;
			}
		}

		/* create new node */
		rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
		if (rose_node == NULL) {
			res = -ENOMEM;
			goto out;
		}

		rose_node->address      = rose_route->address;
		rose_node->mask         = rose_route->mask;
		rose_node->count        = 1;
		rose_node->loopback     = 0;
		rose_node->neighbour[0] = rose_neigh;

		if (rose_tmpn == NULL) {
			if (rose_tmpp == NULL) {	/* Empty list */
				rose_node_list  = rose_node;
				rose_node->next = NULL;
			} else {
				rose_tmpp->next = rose_node;
				rose_node->next = NULL;
			}
		} else {
			if (rose_tmpp == NULL) {	/* 1st node */
				rose_node->next = rose_node_list;
				rose_node_list  = rose_node;
			} else {
				rose_tmpp->next = rose_node;
				rose_node->next = rose_tmpn;
			}
		}
		rose_neigh->count++;

		goto out;
	}

	/* We have space, slot it in */
	if (rose_node->count < 3) {
		rose_node->neighbour[rose_node->count] = rose_neigh;
		rose_node->count++;
		rose_neigh->count++;
	}

out:
	spin_unlock_bh(&rose_neigh_list_lock);
	spin_unlock_bh(&rose_node_list_lock);

	return res;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
560
84.34%
8
66.67%
Ralf Bächle
97
14.61%
3
25.00%
Julia Lawall
7
1.05%
1
8.33%
Total
664
100.00%
12
100.00%

/*
 * Caller is holding rose_node_list_lock.
 */


static void rose_remove_node(struct rose_node *rose_node)
{
	struct rose_node *s;

	if ((s = rose_node_list) == rose_node) {
		rose_node_list = rose_node->next;
		kfree(rose_node);
		return;
	}

	while (s != NULL && s->next != NULL) {
		if (s->next == rose_node) {
			s->next = rose_node->next;
			kfree(rose_node);
			return;
		}

		s = s->next;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
84
100.00%
2
100.00%
Total
84
100.00%
2
100.00%

/*
 * Caller is holding rose_neigh_list_lock.
 */


static void rose_remove_neigh(struct rose_neigh *rose_neigh)
{
	struct rose_neigh *s;

	rose_stop_ftimer(rose_neigh);
	rose_stop_t0timer(rose_neigh);

	skb_queue_purge(&rose_neigh->queue);

	if ((s = rose_neigh_list) == rose_neigh) {
		rose_neigh_list = rose_neigh->next;
		if (rose_neigh->ax25)
			ax25_cb_put(rose_neigh->ax25);
		kfree(rose_neigh->digipeat);
		kfree(rose_neigh);
		return;
	}

	while (s != NULL && s->next != NULL) {
		if (s->next == rose_neigh) {
			s->next = rose_neigh->next;
			if (rose_neigh->ax25)
				ax25_cb_put(rose_neigh->ax25);
			kfree(rose_neigh->digipeat);
			kfree(rose_neigh);
			return;
		}

		s = s->next;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
115
80.99%
3
60.00%
Jarek Poplawski
26
18.31%
1
20.00%
Linus Torvalds
1
0.70%
1
20.00%
Total
142
100.00%
5
100.00%

/*
 * Caller is holding rose_route_list_lock.
 */


static void rose_remove_route(struct rose_route *rose_route)
{
	struct rose_route *s;

	if (rose_route->neigh1 != NULL)
		rose_route->neigh1->use--;

	if (rose_route->neigh2 != NULL)
		rose_route->neigh2->use--;

	if ((s = rose_route_list) == rose_route) {
		rose_route_list = rose_route->next;
		kfree(rose_route);
		return;
	}

	while (s != NULL && s->next != NULL) {
		if (s->next == rose_route) {
			s->next = rose_route->next;
			kfree(rose_route);
			return;
		}

		s = s->next;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
114
100.00%
3
100.00%
Total
114
100.00%
3
100.00%

/*
 *      "Delete" a node. Strictly speaking remove a route to a node. The node
 *      is only deleted if no routes are left to it.
 */


static int rose_del_node(struct rose_route_struct *rose_route,
	struct net_device *dev)
{
	struct rose_node  *rose_node;
	struct rose_neigh *rose_neigh;
	int i, err = 0;

	spin_lock_bh(&rose_node_list_lock);
	spin_lock_bh(&rose_neigh_list_lock);

	rose_node = rose_node_list;
	while (rose_node != NULL) {
		if ((rose_node->mask == rose_route->mask) &&
		    (rosecmpm(&rose_route->address, &rose_node->address,
			      rose_route->mask) == 0))
			break;
		rose_node = rose_node->next;
	}

	if (rose_node == NULL || rose_node->loopback) {
		err = -EINVAL;
		goto out;
	}

	rose_neigh = rose_neigh_list;
	while (rose_neigh != NULL) {
		if (ax25cmp(&rose_route->neighbour,
			    &rose_neigh->callsign) == 0 &&
		    rose_neigh->dev == dev)
			break;
		rose_neigh = rose_neigh->next;
	}

	if (rose_neigh == NULL) {
		err = -EINVAL;
		goto out;
	}

	for (i = 0; i < rose_node->count; i++) {
		if (rose_node->neighbour[i] == rose_neigh) {
			rose_neigh->count--;

			if (rose_neigh->count == 0 && rose_neigh->use == 0)
				rose_remove_neigh(rose_neigh);

			rose_node->count--;

			if (rose_node->count == 0) {
				rose_remove_node(rose_node);
			} else {
				switch (i) {
				case 0:
					rose_node->neighbour[0] =
						rose_node->neighbour[1];
				case 1:
					rose_node->neighbour[1] =
						rose_node->neighbour[2];
				case 2:
					break;
				}
			}
			goto out;
		}
	}
	err = -EINVAL;

out:
	spin_unlock_bh(&rose_neigh_list_lock);
	spin_unlock_bh(&rose_node_list_lock);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
242
75.39%
5
71.43%
Ralf Bächle
79
24.61%
2
28.57%
Total
321
100.00%
7
100.00%

/*
 *      Add the loopback neighbour.
 */


void rose_add_loopback_neigh(void)
{
	struct rose_neigh *sn;

	rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
	if (!rose_loopback_neigh)
		return;
	sn = rose_loopback_neigh;

	sn->callsign  = null_ax25_address;
	sn->digipeat  = NULL;
	sn->ax25      = NULL;
	sn->dev       = NULL;
	sn->count     = 0;
	sn->use       = 0;
	sn->dce_mode  = 1;
	sn->loopback  = 1;
	sn->number    = rose_neigh_no++;
	sn->restarted = 1;

	skb_queue_head_init(&sn->queue);

	init_timer(&sn->ftimer);
	init_timer(&sn->t0timer);

	spin_lock_bh(&rose_neigh_list_lock);
	sn->next = rose_neigh_list;
	rose_neigh_list           = sn;
	spin_unlock_bh(&rose_neigh_list_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
93
65.49%
2
33.33%
Ralf Bächle
26
18.31%
3
50.00%
Alexey Dobriyan
23
16.20%
1
16.67%
Total
142
100.00%
6
100.00%

/*
 *      Add a loopback node.
 */


int rose_add_loopback_node(rose_address *address)
{
	struct rose_node *rose_node;
	int err = 0;

	spin_lock_bh(&rose_node_list_lock);

	rose_node = rose_node_list;
	while (rose_node != NULL) {
		if ((rose_node->mask == 10) &&
		     (rosecmpm(address, &rose_node->address, 10) == 0) &&
		     rose_node->loopback)
			break;
		rose_node = rose_node->next;
	}

	if (rose_node != NULL)
		goto out;

	if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
		err = -ENOMEM;
		goto out;
	}

	rose_node->address      = *address;
	rose_node->mask         = 10;
	rose_node->count        = 1;
	rose_node->loopback     = 1;
	rose_node->neighbour[0] = rose_loopback_neigh;

	/* Insert at the head of list. Address is always mask=10 */
	rose_node->next = rose_node_list;
	rose_node_list  = rose_node;

	rose_loopback_neigh->count++;

out:
	spin_unlock_bh(&rose_node_list_lock);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
129
74.57%
2
33.33%
Ralf Bächle
42
24.28%
2
33.33%
Alexey Dobriyan
2
1.16%
2
33.33%
Total
173
100.00%
6
100.00%

/*
 *      Delete a loopback node.
 */


void rose_del_loopback_node(rose_address *address)
{
	struct rose_node *rose_node;

	spin_lock_bh(&rose_node_list_lock);

	rose_node = rose_node_list;
	while (rose_node != NULL) {
		if ((rose_node->mask == 10) &&
		    (rosecmpm(address, &rose_node->address, 10) == 0) &&
		    rose_node->loopback)
			break;
		rose_node = rose_node->next;
	}

	if (rose_node == NULL)
		goto out;

	rose_remove_node(rose_node);

	rose_loopback_neigh->count--;

out:
	spin_unlock_bh(&rose_node_list_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
66
68.75%
1
25.00%
Ralf Bächle
29
30.21%
2
50.00%
Alexey Dobriyan
1
1.04%
1
25.00%
Total
96
100.00%
4
100.00%

/*
 *      A device has been removed. Remove its routes and neighbours.
 */


void rose_rt_device_down(struct net_device *dev)
{
	struct rose_neigh *s, *rose_neigh;
	struct rose_node  *t, *rose_node;
	int i;

	spin_lock_bh(&rose_node_list_lock);
	spin_lock_bh(&rose_neigh_list_lock);
	rose_neigh = rose_neigh_list;
	while (rose_neigh != NULL) {
		s          = rose_neigh;
		rose_neigh = rose_neigh->next;

		if (s->dev != dev)
			continue;

		rose_node = rose_node_list;

		while (rose_node != NULL) {
			t         = rose_node;
			rose_node = rose_node->next;

			for (i = 0; i < t->count; i++) {
				if (t->neighbour[i] != s)
					continue;

				t->count--;

				switch (i) {
				case 0:
					t->neighbour[0] = t->neighbour[1];
				case 1:
					t->neighbour[1] = t->neighbour[2];
				case 2:
					break;
				}
			}

			if (t->count <= 0)
				rose_remove_node(t);
		}

		rose_remove_neigh(s);
	}
	spin_unlock_bh(&rose_neigh_list_lock);
	spin_unlock_bh(&rose_node_list_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
174
86.14%
2
50.00%
Ralf Bächle
28
13.86%
2
50.00%
Total
202
100.00%
4
100.00%

#if 0 /* Currently unused */
/*
 *      A device has been removed. Remove its links.
 */
void rose_route_device_down(struct net_device *dev)
{
        struct rose_route *s, *rose_route;

        spin_lock_bh(&rose_route_list_lock);
        rose_route = rose_route_list;
        while (rose_route != NULL) {
                s          = rose_route;
                rose_route = rose_route->next;

                if (s->neigh1->dev == dev || s->neigh2->dev == dev)
                        rose_remove_route(s);
        }
        spin_unlock_bh(&rose_route_list_lock);
}
#endif

/*
 *      Clear all nodes and neighbours out, except for neighbours with
 *      active connections going through them.
 *  Do not clear loopback neighbour and nodes.
 */


static int rose_clear_routes(void)
{
	struct rose_neigh *s, *rose_neigh;
	struct rose_node  *t, *rose_node;

	spin_lock_bh(&rose_node_list_lock);
	spin_lock_bh(&rose_neigh_list_lock);

	rose_neigh = rose_neigh_list;
	rose_node  = rose_node_list;

	while (rose_node != NULL) {
		t         = rose_node;
		rose_node = rose_node->next;
		if (!t->loopback)
			rose_remove_node(t);
	}

	while (rose_neigh != NULL) {
		s          = rose_neigh;
		rose_neigh = rose_neigh->next;

		if (s->use == 0 && !s->loopback) {
			s->count = 0;
			rose_remove_neigh(s);
		}
	}

	spin_unlock_bh(&rose_neigh_list_lock);
	spin_unlock_bh(&rose_node_list_lock);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
101
75.94%
2
50.00%
Ralf Bächle
32
24.06%
2
50.00%
Total
133
100.00%
4
100.00%

/*
 *      Check that the device given is a valid AX.25 interface that is "up".
 *      called with RTNL
 */


static struct net_device *rose_ax25_dev_find(char *devname)
{
	struct net_device *dev;

	if ((dev = __dev_get_by_name(&init_net, devname)) == NULL)
		return NULL;

	if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
		return dev;

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
52
89.66%
2
40.00%
Eric W. Biedermann
3
5.17%
1
20.00%
Eric Dumazet
2
3.45%
1
20.00%
Adrian Bunk
1
1.72%
1
20.00%
Total
58
100.00%
5
100.00%

/*
 *      Find the first active ROSE device, usually "rose0".
 */


struct net_device *rose_dev_first(void)
{
	struct net_device *dev, *first = NULL;

	rcu_read_lock();
	for_each_netdev_rcu(&init_net, dev) {
		if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
			if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
				first = dev;
	}
	rcu_read_unlock();

	return first;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
67
87.01%
3
50.00%
Eric Dumazet
5
6.49%
1
16.67%
Pavel Emelyanov
3
3.90%
1
16.67%
Eric W. Biedermann
2
2.60%
1
16.67%
Total
77
100.00%
6
100.00%

/*
 *      Find the ROSE device for the given address.
 */


struct net_device *rose_dev_get(rose_address *addr)
{
	struct net_device *dev;

	rcu_read_lock();
	for_each_netdev_rcu(&init_net, dev) {
		if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
			dev_hold(dev);
			goto out;
		}
	}
	dev = NULL;
out:
	rcu_read_unlock();
	return dev;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
66
82.50%
4
57.14%
Pavel Emelyanov
7
8.75%
1
14.29%
Eric Dumazet
5
6.25%
1
14.29%
Eric W. Biedermann
2
2.50%
1
14.29%
Total
80
100.00%
7
100.00%



static int rose_dev_exists(rose_address *addr)
{
	struct net_device *dev;

	rcu_read_lock();
	for_each_netdev_rcu(&init_net, dev) {
		if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
			goto out;
	}
	dev = NULL;
out:
	rcu_read_unlock();
	return dev != NULL;
}




Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
60
81.08%
1
25.00%
Pavel Emelyanov
7
9.46%
1
25.00%
Eric Dumazet
5
6.76%
1
25.00%
Eric W. Biedermann
2
2.70%
1
25.00%
Total
74
100.00%
4
100.00%



struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
{
	struct rose_route *rose_route;

	for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
		if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
		    (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
			return rose_route;

	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
73
100.00%
1
100.00%
Total
73
100.00%
1
100.00%

/*
 *      Find a neighbour or a route given a ROSE address.
 */


struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
	unsigned char *diagnostic, int route_frame)
{
	struct rose_neigh *res = NULL;
	struct rose_node *node;
	int failed = 0;
	int i;

	if (!route_frame) spin_lock_bh(&rose_node_list_lock);
	for (node = rose_node_list; node != NULL; node = node->next) {
		if (rosecmpm(addr, &node->address, node->mask) == 0) {
			for (i = 0; i < node->count; i++) {
				if (node->neighbour[i]->restarted) {
					res = node->neighbour[i];
					goto out;
				}
			}
		}
	}
	if (!route_frame) { /* connect request */
		for (node = rose_node_list; node != NULL; node = node->next) {
			if (rosecmpm(addr, &node->address, node->mask) == 0) {
				for (i = 0; i < node->count; i++) {
					if (!rose_ftimer_running(node->neighbour[i])) {
						res = node->neighbour[i];
						failed = 0;
						goto out;
					}
					failed = 1;
				}
			}
		}
	}

	if (failed) {
		*cause      = ROSE_OUT_OF_ORDER;
		*diagnostic = 0;
	} else {
		*cause      = ROSE_NOT_OBTAINABLE;
		*diagnostic = 0;
	}

out:
	if (!route_frame) spin_unlock_bh(&rose_node_list_lock);
	return res;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
145
52.16%
6
60.00%
Bernard Pidoux
105
37.77%
2
20.00%
Ralf Bächle
28
10.07%
2
20.00%
Total
278
100.00%
10
100.00%

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


int rose_rt_ioctl(unsigned int cmd, void __user *arg)
{
	struct rose_route_struct rose_route;
	struct net_device *dev;
	int err;

	switch (cmd) {
	case SIOCADDRT:
		if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
			return -EFAULT;
		if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
			return -EINVAL;
		if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
			return -EINVAL;
		if (rose_route.mask ></