[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / phonet / pn_dev.c

/*
 * File: pn_dev.c
 *
 * Phonet network device
 *
 * Copyright (C) 2008 Nokia Corporation.
 *
 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/kernel.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/phonet.h>
#include <linux/proc_fs.h>
#include <linux/if_arp.h>
#include <net/sock.h>
#include <net/netns/generic.h>
#include <net/phonet/pn_dev.h>

struct phonet_routes {
	struct mutex		lock;
	struct net_device	*table[64];
};

struct phonet_net {
	struct phonet_device_list pndevs;
	struct phonet_routes routes;
};

int phonet_net_id __read_mostly;

static struct phonet_net *phonet_pernet(struct net *net)
{
	BUG_ON(!net);

	return net_generic(net, phonet_net_id);
}

struct phonet_device_list *phonet_device_list(struct net *net)
{
	struct phonet_net *pnn = phonet_pernet(net);
	return &pnn->pndevs;
}

/* Allocate new Phonet device. */
static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
	if (pnd == NULL)
		return NULL;
	pnd->netdev = dev;
	bitmap_zero(pnd->addrs, 64);

	BUG_ON(!mutex_is_locked(&pndevs->lock));
	list_add_rcu(&pnd->list, &pndevs->list);
	return pnd;
}

static struct phonet_device *__phonet_get(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;

	BUG_ON(!mutex_is_locked(&pndevs->lock));
	list_for_each_entry(pnd, &pndevs->list, list) {
		if (pnd->netdev == dev)
			return pnd;
	}
	return NULL;
}

static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;

	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
		if (pnd->netdev == dev)
			return pnd;
	}
	return NULL;
}

static void phonet_device_destroy(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;

	ASSERT_RTNL();

	mutex_lock(&pndevs->lock);
	pnd = __phonet_get(dev);
	if (pnd)
		list_del_rcu(&pnd->list);
	mutex_unlock(&pndevs->lock);

	if (pnd) {
		u8 addr;

		for_each_set_bit(addr, pnd->addrs, 64)
			phonet_address_notify(RTM_DELADDR, dev, addr);
		kfree(pnd);
	}
}

struct net_device *phonet_device_get(struct net *net)
{
	struct phonet_device_list *pndevs = phonet_device_list(net);
	struct phonet_device *pnd;
	struct net_device *dev = NULL;

	rcu_read_lock();
	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
		dev = pnd->netdev;
		BUG_ON(!dev);

		if ((dev->reg_state == NETREG_REGISTERED) &&
			((pnd->netdev->flags & IFF_UP)) == IFF_UP)
			break;
		dev = NULL;
	}
	if (dev)
		dev_hold(dev);
	rcu_read_unlock();
	return dev;
}

int phonet_address_add(struct net_device *dev, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;
	int err = 0;

	mutex_lock(&pndevs->lock);
	/* Find or create Phonet-specific device data */
	pnd = __phonet_get(dev);
	if (pnd == NULL)
		pnd = __phonet_device_alloc(dev);
	if (unlikely(pnd == NULL))
		err = -ENOMEM;
	else if (test_and_set_bit(addr >> 2, pnd->addrs))
		err = -EEXIST;
	mutex_unlock(&pndevs->lock);
	return err;
}

int phonet_address_del(struct net_device *dev, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;
	int err = 0;

	mutex_lock(&pndevs->lock);
	pnd = __phonet_get(dev);
	if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
		err = -EADDRNOTAVAIL;
		pnd = NULL;
	} else if (bitmap_empty(pnd->addrs, 64))
		list_del_rcu(&pnd->list);
	else
		pnd = NULL;
	mutex_unlock(&pndevs->lock);

	if (pnd) {
		synchronize_rcu();
		kfree(pnd);
	}
	return err;
}

/* Gets a source address toward a destination, through a interface. */
u8 phonet_address_get(struct net_device *dev, u8 daddr)
{
	struct phonet_device *pnd;
	u8 saddr;

	rcu_read_lock();
	pnd = __phonet_get_rcu(dev);
	if (pnd) {
		BUG_ON(bitmap_empty(pnd->addrs, 64));

		/* Use same source address as destination, if possible */
		if (test_bit(daddr >> 2, pnd->addrs))
			saddr = daddr;
		else
			saddr = find_first_bit(pnd->addrs, 64) << 2;
	} else
		saddr = PN_NO_ADDR;
	rcu_read_unlock();

	if (saddr == PN_NO_ADDR) {
		/* Fallback to another device */
		struct net_device *def_dev;

		def_dev = phonet_device_get(dev_net(dev));
		if (def_dev) {
			if (def_dev != dev)
				saddr = phonet_address_get(def_dev, daddr);
			dev_put(def_dev);
		}
	}
	return saddr;
}

int phonet_address_lookup(struct net *net, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(net);
	struct phonet_device *pnd;
	int err = -EADDRNOTAVAIL;

	rcu_read_lock();
	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
		/* Don't allow unregistering devices! */
		if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
				((pnd->netdev->flags & IFF_UP)) != IFF_UP)
			continue;

		if (test_bit(addr >> 2, pnd->addrs)) {
			err = 0;
			goto found;
		}
	}
found:
	rcu_read_unlock();
	return err;
}

/* automatically configure a Phonet device, if supported */
static int phonet_device_autoconf(struct net_device *dev)
{
	struct if_phonet_req req;
	int ret;

	if (!dev->netdev_ops->ndo_do_ioctl)
		return -EOPNOTSUPP;

	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
						SIOCPNGAUTOCONF);
	if (ret < 0)
		return ret;

	ASSERT_RTNL();
	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	if (ret)
		return ret;
	phonet_address_notify(RTM_NEWADDR, dev,
				req.ifr_phonet_autoconf.device);
	return 0;
}

static void phonet_route_autodel(struct net_device *dev)
{
	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
	unsigned i;
	DECLARE_BITMAP(deleted, 64);

	/* Remove left-over Phonet routes */
	bitmap_zero(deleted, 64);
	mutex_lock(&pnn->routes.lock);
	for (i = 0; i < 64; i++)
		if (dev == pnn->routes.table[i]) {
			rcu_assign_pointer(pnn->routes.table[i], NULL);
			set_bit(i, deleted);
		}
	mutex_unlock(&pnn->routes.lock);

	if (bitmap_empty(deleted, 64))
		return; /* short-circuit RCU */
	synchronize_rcu();
	for (i = find_first_bit(deleted, 64); i < 64;
			i = find_next_bit(deleted, 64, i + 1)) {
		rtm_phonet_notify(RTM_DELROUTE, dev, i);
		dev_put(dev);
	}
}

/* notify Phonet of device events */
static int phonet_device_notify(struct notifier_block *me, unsigned long what,
				void *arg)
{
	struct net_device *dev = arg;

	switch (what) {
	case NETDEV_REGISTER:
		if (dev->type == ARPHRD_PHONET)
			phonet_device_autoconf(dev);
		break;
	case NETDEV_UNREGISTER:
		phonet_device_destroy(dev);
		phonet_route_autodel(dev);
		break;
	}
	return 0;

}

static struct notifier_block phonet_device_notifier = {
	.notifier_call = phonet_device_notify,
	.priority = 0,
};

/* Per-namespace Phonet devices handling */
static int __net_init phonet_init_net(struct net *net)
{
	struct phonet_net *pnn = phonet_pernet(net);

	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops))
		return -ENOMEM;

	INIT_LIST_HEAD(&pnn->pndevs.list);
	mutex_init(&pnn->pndevs.lock);
	mutex_init(&pnn->routes.lock);
	return 0;
}

static void __net_exit phonet_exit_net(struct net *net)
{
	struct phonet_net *pnn = phonet_pernet(net);
	struct net_device *dev;
	unsigned i;

	rtnl_lock();
	for_each_netdev(net, dev)
		phonet_device_destroy(dev);

	for (i = 0; i < 64; i++) {
		dev = pnn->routes.table[i];
		if (dev) {
			rtm_phonet_notify(RTM_DELROUTE, dev, i);
			dev_put(dev);
		}
	}
	rtnl_unlock();

	proc_net_remove(net, "phonet");
}

static struct pernet_operations phonet_net_ops = {
	.init = phonet_init_net,
	.exit = phonet_exit_net,
	.id   = &phonet_net_id,
	.size = sizeof(struct phonet_net),
};

/* Initialize Phonet devices list */
int __init phonet_device_init(void)
{
	int err = register_pernet_device(&phonet_net_ops);
	if (err)
		return err;

	register_netdevice_notifier(&phonet_device_notifier);
	err = phonet_netlink_register();
	if (err)
		phonet_device_exit();
	return err;
}

void phonet_device_exit(void)
{
	rtnl_unregister_all(PF_PHONET);
	unregister_netdevice_notifier(&phonet_device_notifier);
	unregister_pernet_device(&phonet_net_ops);
}

int phonet_route_add(struct net_device *dev, u8 daddr)
{
	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
	struct phonet_routes *routes = &pnn->routes;
	int err = -EEXIST;

	daddr = daddr >> 2;
	mutex_lock(&routes->lock);
	if (routes->table[daddr] == NULL) {
		rcu_assign_pointer(routes->table[daddr], dev);
		dev_hold(dev);
		err = 0;
	}
	mutex_unlock(&routes->lock);
	return err;
}

int phonet_route_del(struct net_device *dev, u8 daddr)
{
	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
	struct phonet_routes *routes = &pnn->routes;

	daddr = daddr >> 2;
	mutex_lock(&routes->lock);
	if (dev == routes->table[daddr])
		rcu_assign_pointer(routes->table[daddr], NULL);
	else
		dev = NULL;
	mutex_unlock(&routes->lock);

	if (!dev)
		return -ENOENT;
	synchronize_rcu();
	dev_put(dev);
	return 0;
}

struct net_device *phonet_route_get(struct net *net, u8 daddr)
{
	struct phonet_net *pnn = phonet_pernet(net);
	struct phonet_routes *routes = &pnn->routes;
	struct net_device *dev;

	ASSERT_RTNL(); /* no need to hold the device */

	daddr >>= 2;
	rcu_read_lock();
	dev = rcu_dereference(routes->table[daddr]);
	rcu_read_unlock();
	return dev;
}

struct net_device *phonet_route_output(struct net *net, u8 daddr)
{
	struct phonet_net *pnn = phonet_pernet(net);
	struct phonet_routes *routes = &pnn->routes;
	struct net_device *dev;

	daddr >>= 2;
	rcu_read_lock();
	dev = rcu_dereference(routes->table[daddr]);
	if (dev)
		dev_hold(dev);
	rcu_read_unlock();

	if (!dev)
		dev = phonet_device_get(net); /* Default route */
	return dev;
}
Commit	Line	Data
f8ff6028 RDC	1	/*
	2	* File: pn_dev.c
	3	*
	4	* Phonet network device
	5	*
	6	* Copyright (C) 2008 Nokia Corporation.
	7	*
	8	* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
	9	* Original author: Sakari Ailus <sakari.ailus@nokia.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* version 2 as published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	23	* 02110-1301 USA
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/net.h>
5a0e3ad6	28	#include <linux/slab.h>
f8ff6028 RDC	29	#include <linux/netdevice.h>
f8ff6028 RDC	30	#include <linux/phonet.h>
421d20a3	31	#include <linux/proc_fs.h>
f5bb1c55	32	#include <linux/if_arp.h>
f8ff6028	33	#include <net/sock.h>
9a3b7a42	34	#include <net/netns/generic.h>
f8ff6028 RDC	35	#include <net/phonet/pn_dev.h>
f8ff6028 RDC	36
55748ac0	37	struct phonet_routes {
88880135	38	struct mutex lock;
55748ac0 RDC	39	struct net_device *table[64];
	40	};
	41
9a3b7a42	42	struct phonet_net {
9a3b7a42	43	struct phonet_device_list pndevs;
55748ac0	44	struct phonet_routes routes;
f8ff6028 RDC	45	};
f8ff6028 RDC	46
f99189b1	47	int phonet_net_id __read_mostly;
9a3b7a42	48
0db3f0f4 JP	49	static struct phonet_net phonet_pernet(struct net net)
	50	{
	51	BUG_ON(!net);
	52
	53	return net_generic(net, phonet_net_id);
	54	}
	55
9a3b7a42	56	struct phonet_device_list phonet_device_list(struct net net)
9a3b7a42	57	{
0db3f0f4	58	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	59	return &pnn->pndevs;
	60	}
	61
f8ff6028 RDC	62	/* Allocate new Phonet device. */
	63	static struct phonet_device __phonet_device_alloc(struct net_device dev)
	64	{
9a3b7a42	65	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	66	struct phonet_device pnd = kmalloc(sizeof(pnd), GFP_ATOMIC);
	67	if (pnd == NULL)
	68	return NULL;
	69	pnd->netdev = dev;
	70	bitmap_zero(pnd->addrs, 64);
	71
eeb74a9d RDC	72	BUG_ON(!mutex_is_locked(&pndevs->lock));
eeb74a9d RDC	73	list_add_rcu(&pnd->list, &pndevs->list);
f8ff6028 RDC	74	return pnd;
	75	}
	76
	77	static struct phonet_device __phonet_get(struct net_device dev)
	78	{
9a3b7a42	79	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	80	struct phonet_device *pnd;
f8ff6028 RDC	81
eeb74a9d	82	BUG_ON(!mutex_is_locked(&pndevs->lock));
9a3b7a42	83	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	84	if (pnd->netdev == dev)
	85	return pnd;
	86	}
	87	return NULL;
	88	}
	89
eeb74a9d RDC	90	static struct phonet_device __phonet_get_rcu(struct net_device dev)
	91	{
	92	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	93	struct phonet_device *pnd;
	94
	95	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
	96	if (pnd->netdev == dev)
	97	return pnd;
	98	}
	99	return NULL;
	100	}
	101
2be6fa4c	102	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	103	{
2be6fa4c RDC	104	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	105	struct phonet_device *pnd;
	106
	107	ASSERT_RTNL();
	108
eeb74a9d	109	mutex_lock(&pndevs->lock);
2be6fa4c RDC	110	pnd = __phonet_get(dev);
2be6fa4c RDC	111	if (pnd)
eeb74a9d RDC	112	list_del_rcu(&pnd->list);
eeb74a9d RDC	113	mutex_unlock(&pndevs->lock);
2be6fa4c RDC	114
	115	if (pnd) {
	116	u8 addr;
	117
a1ca14ac	118	for_each_set_bit(addr, pnd->addrs, 64)
2be6fa4c RDC	119	phonet_address_notify(RTM_DELADDR, dev, addr);
	120	kfree(pnd);
	121	}
f8ff6028 RDC	122	}
	123
	124	struct net_device phonet_device_get(struct net net)
	125	{
9a3b7a42	126	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	127	struct phonet_device *pnd;
59e57f44	128	struct net_device *dev = NULL;
f8ff6028	129
eeb74a9d RDC	130	rcu_read_lock();
eeb74a9d RDC	131	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	132	dev = pnd->netdev;
	133	BUG_ON(!dev);
	134
9a3b7a42	135	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	136	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	137	break;
	138	dev = NULL;
	139	}
	140	if (dev)
	141	dev_hold(dev);
eeb74a9d	142	rcu_read_unlock();
f8ff6028 RDC	143	return dev;
	144	}
	145
	146	int phonet_address_add(struct net_device *dev, u8 addr)
	147	{
9a3b7a42	148	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	149	struct phonet_device *pnd;
	150	int err = 0;
	151
eeb74a9d	152	mutex_lock(&pndevs->lock);
f8ff6028 RDC	153	/* Find or create Phonet-specific device data */
	154	pnd = __phonet_get(dev);
	155	if (pnd == NULL)
	156	pnd = __phonet_device_alloc(dev);
	157	if (unlikely(pnd == NULL))
	158	err = -ENOMEM;
	159	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	160	err = -EEXIST;
eeb74a9d	161	mutex_unlock(&pndevs->lock);
f8ff6028 RDC	162	return err;
	163	}
	164
	165	int phonet_address_del(struct net_device *dev, u8 addr)
	166	{
9a3b7a42	167	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	168	struct phonet_device *pnd;
	169	int err = 0;
	170
eeb74a9d	171	mutex_lock(&pndevs->lock);
f8ff6028	172	pnd = __phonet_get(dev);
eeb74a9d	173	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs)) {
f8ff6028	174	err = -EADDRNOTAVAIL;
eeb74a9d RDC	175	pnd = NULL;
	176	} else if (bitmap_empty(pnd->addrs, 64))
	177	list_del_rcu(&pnd->list);
	178	else
	179	pnd = NULL;
	180	mutex_unlock(&pndevs->lock);
	181
	182	if (pnd) {
	183	synchronize_rcu();
2be6fa4c RDC	184	kfree(pnd);
2be6fa4c RDC	185	}
f8ff6028 RDC	186	return err;
	187	}
	188
	189	/* Gets a source address toward a destination, through a interface. */
55748ac0	190	u8 phonet_address_get(struct net_device *dev, u8 daddr)
f8ff6028 RDC	191	{
f8ff6028 RDC	192	struct phonet_device *pnd;
55748ac0	193	u8 saddr;
f8ff6028	194
eeb74a9d RDC	195	rcu_read_lock();
eeb74a9d RDC	196	pnd = __phonet_get_rcu(dev);
f8ff6028 RDC	197	if (pnd) {
	198	BUG_ON(bitmap_empty(pnd->addrs, 64));
	199
	200	/* Use same source address as destination, if possible */
55748ac0 RDC	201	if (test_bit(daddr >> 2, pnd->addrs))
	202	saddr = daddr;
	203	else
	204	saddr = find_first_bit(pnd->addrs, 64) << 2;
f8ff6028	205	} else
55748ac0	206	saddr = PN_NO_ADDR;
eeb74a9d	207	rcu_read_unlock();
55748ac0 RDC	208
	209	if (saddr == PN_NO_ADDR) {
	210	/* Fallback to another device */
	211	struct net_device *def_dev;
	212
	213	def_dev = phonet_device_get(dev_net(dev));
	214	if (def_dev) {
	215	if (def_dev != dev)
	216	saddr = phonet_address_get(def_dev, daddr);
	217	dev_put(def_dev);
	218	}
	219	}
	220	return saddr;
f8ff6028 RDC	221	}
f8ff6028 RDC	222
52404881	223	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	224	{
9a3b7a42	225	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	226	struct phonet_device *pnd;
9a3b7a42	227	int err = -EADDRNOTAVAIL;
f8ff6028	228
eeb74a9d RDC	229	rcu_read_lock();
eeb74a9d RDC	230	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	231	/* Don't allow unregistering devices! */
	232	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	233	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	234	continue;
	235
	236	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	237	err = 0;
9a3b7a42	238	goto found;
f8ff6028 RDC	239	}
f8ff6028 RDC	240	}
9a3b7a42	241	found:
eeb74a9d	242	rcu_read_unlock();
9a3b7a42	243	return err;
f8ff6028 RDC	244	}
f8ff6028 RDC	245
f5bb1c55 RDC	246	/* automatically configure a Phonet device, if supported */
	247	static int phonet_device_autoconf(struct net_device *dev)
	248	{
	249	struct if_phonet_req req;
	250	int ret;
	251
	252	if (!dev->netdev_ops->ndo_do_ioctl)
	253	return -EOPNOTSUPP;
	254
	255	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	256	SIOCPNGAUTOCONF);
	257	if (ret < 0)
	258	return ret;
b11b5165 RDC	259
	260	ASSERT_RTNL();
	261	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	262	if (ret)
	263	return ret;
	264	phonet_address_notify(RTM_NEWADDR, dev,
	265	req.ifr_phonet_autoconf.device);
	266	return 0;
f5bb1c55 RDC	267	}
f5bb1c55 RDC	268
f062f41d RDC	269	static void phonet_route_autodel(struct net_device *dev)
f062f41d RDC	270	{
0db3f0f4	271	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
f062f41d RDC	272	unsigned i;
	273	DECLARE_BITMAP(deleted, 64);
	274
	275	/* Remove left-over Phonet routes */
	276	bitmap_zero(deleted, 64);
88880135	277	mutex_lock(&pnn->routes.lock);
f062f41d RDC	278	for (i = 0; i < 64; i++)
f062f41d RDC	279	if (dev == pnn->routes.table[i]) {
88880135	280	rcu_assign_pointer(pnn->routes.table[i], NULL);
f062f41d	281	set_bit(i, deleted);
f062f41d	282	}
88880135 RDC	283	mutex_unlock(&pnn->routes.lock);
	284
	285	if (bitmap_empty(deleted, 64))
	286	return; /* short-circuit RCU */
	287	synchronize_rcu();
f062f41d	288	for (i = find_first_bit(deleted, 64); i < 64;
88880135	289	i = find_next_bit(deleted, 64, i + 1)) {
f062f41d	290	rtm_phonet_notify(RTM_DELROUTE, dev, i);
88880135 RDC	291	dev_put(dev);
88880135 RDC	292	}
f062f41d RDC	293	}
f062f41d RDC	294
f8ff6028 RDC	295	/* notify Phonet of device events */
	296	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	297	void *arg)
	298	{
	299	struct net_device *dev = arg;
	300
f5bb1c55 RDC	301	switch (what) {
	302	case NETDEV_REGISTER:
	303	if (dev->type == ARPHRD_PHONET)
	304	phonet_device_autoconf(dev);
	305	break;
	306	case NETDEV_UNREGISTER:
2be6fa4c	307	phonet_device_destroy(dev);
f062f41d	308	phonet_route_autodel(dev);
f5bb1c55 RDC	309	break;
f5bb1c55 RDC	310	}
f8ff6028 RDC	311	return 0;
	312
	313	}
	314
	315	static struct notifier_block phonet_device_notifier = {
	316	.notifier_call = phonet_device_notify,
	317	.priority = 0,
	318	};
	319
9a3b7a42	320	/* Per-namespace Phonet devices handling */
2c8c1e72	321	static int __net_init phonet_init_net(struct net *net)
9a3b7a42	322	{
0db3f0f4	323	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	324
d2b3eb63	325	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops))
c1dc13e9	326	return -ENOMEM;
c1dc13e9	327
9a3b7a42	328	INIT_LIST_HEAD(&pnn->pndevs.list);
eeb74a9d	329	mutex_init(&pnn->pndevs.lock);
88880135	330	mutex_init(&pnn->routes.lock);
9a3b7a42	331	return 0;
	332	}
	333
2c8c1e72	334	static void __net_exit phonet_exit_net(struct net *net)
9a3b7a42	335	{
0db3f0f4	336	struct phonet_net *pnn = phonet_pernet(net);
2be6fa4c	337	struct net_device *dev;
f062f41d	338	unsigned i;
9a3b7a42	339
2be6fa4c RDC	340	rtnl_lock();
	341	for_each_netdev(net, dev)
	342	phonet_device_destroy(dev);
f062f41d RDC	343
	344	for (i = 0; i < 64; i++) {
	345	dev = pnn->routes.table[i];
	346	if (dev) {
	347	rtm_phonet_notify(RTM_DELROUTE, dev, i);
	348	dev_put(dev);
	349	}
	350	}
2be6fa4c	351	rtnl_unlock();
c1dc13e9 RDC	352
c1dc13e9 RDC	353	proc_net_remove(net, "phonet");
9a3b7a42	354	}
	355
	356	static struct pernet_operations phonet_net_ops = {
	357	.init = phonet_init_net,
	358	.exit = phonet_exit_net,
d2b3eb63 EB	359	.id = &phonet_net_id,
d2b3eb63 EB	360	.size = sizeof(struct phonet_net),
9a3b7a42	361	};
9a3b7a42	362
f8ff6028	363	/* Initialize Phonet devices list */
76e02cf6	364	int __init phonet_device_init(void)
f8ff6028	365	{
d2b3eb63	366	int err = register_pernet_device(&phonet_net_ops);
9a3b7a42	367	if (err)
9a3b7a42	368	return err;
660f706d	369
f8ff6028	370	register_netdevice_notifier(&phonet_device_notifier);
660f706d	371	err = phonet_netlink_register();
	372	if (err)
	373	phonet_device_exit();
	374	return err;
f8ff6028 RDC	375	}
	376
	377	void phonet_device_exit(void)
	378	{
f8ff6028	379	rtnl_unregister_all(PF_PHONET);
6530e0fe	380	unregister_netdevice_notifier(&phonet_device_notifier);
d2b3eb63	381	unregister_pernet_device(&phonet_net_ops);
f8ff6028	382	}
55748ac0 RDC	383
	384	int phonet_route_add(struct net_device *dev, u8 daddr)
	385	{
0db3f0f4	386	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0 RDC	387	struct phonet_routes *routes = &pnn->routes;
	388	int err = -EEXIST;
	389
	390	daddr = daddr >> 2;
88880135	391	mutex_lock(&routes->lock);
55748ac0	392	if (routes->table[daddr] == NULL) {
88880135	393	rcu_assign_pointer(routes->table[daddr], dev);
55748ac0 RDC	394	dev_hold(dev);
	395	err = 0;
	396	}
88880135	397	mutex_unlock(&routes->lock);
55748ac0 RDC	398	return err;
	399	}
	400
	401	int phonet_route_del(struct net_device *dev, u8 daddr)
	402	{
0db3f0f4	403	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0	404	struct phonet_routes *routes = &pnn->routes;
55748ac0 RDC	405
55748ac0 RDC	406	daddr = daddr >> 2;
88880135 RDC	407	mutex_lock(&routes->lock);
	408	if (dev == routes->table[daddr])
	409	rcu_assign_pointer(routes->table[daddr], NULL);
	410	else
	411	dev = NULL;
	412	mutex_unlock(&routes->lock);
	413
	414	if (!dev)
	415	return -ENOENT;
	416	synchronize_rcu();
	417	dev_put(dev);
	418	return 0;
55748ac0 RDC	419	}
	420
	421	struct net_device phonet_route_get(struct net net, u8 daddr)
	422	{
0db3f0f4	423	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	424	struct phonet_routes *routes = &pnn->routes;
	425	struct net_device *dev;
	426
	427	ASSERT_RTNL(); /* no need to hold the device */
	428
	429	daddr >>= 2;
88880135 RDC	430	rcu_read_lock();
	431	dev = rcu_dereference(routes->table[daddr]);
	432	rcu_read_unlock();
55748ac0 RDC	433	return dev;
	434	}
	435
	436	struct net_device phonet_route_output(struct net net, u8 daddr)
	437	{
0db3f0f4	438	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	439	struct phonet_routes *routes = &pnn->routes;
	440	struct net_device *dev;
	441
88880135 RDC	442	daddr >>= 2;
	443	rcu_read_lock();
	444	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	445	if (dev)
55748ac0 RDC	446	dev_hold(dev);
88880135	447	rcu_read_unlock();
55748ac0 RDC	448
	449	if (!dev)
	450	dev = phonet_device_get(net); /* Default route */
	451	return dev;
	452	}