[mirror_ubuntu-bionic-kernel.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/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;

struct phonet_device_list *phonet_device_list(struct net *net)
{
	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	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);

	list_add(&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;

	list_for_each_entry(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();

	spin_lock_bh(&pndevs->lock);
	pnd = __phonet_get(dev);
	if (pnd)
		list_del(&pnd->list);
	spin_unlock_bh(&pndevs->lock);

	if (pnd) {
		u8 addr;

		for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
			addr = find_next_bit(pnd->addrs, 64, 1+addr))
			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;

	spin_lock_bh(&pndevs->lock);
	list_for_each_entry(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);
	spin_unlock_bh(&pndevs->lock);
	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;

	spin_lock_bh(&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;
	spin_unlock_bh(&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;

	spin_lock_bh(&pndevs->lock);
	pnd = __phonet_get(dev);
	if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
		err = -EADDRNOTAVAIL;
	else if (bitmap_empty(pnd->addrs, 64)) {
		list_del(&pnd->list);
		kfree(pnd);
	}
	spin_unlock_bh(&pndevs->lock);
	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_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;
	u8 saddr;

	spin_lock_bh(&pndevs->lock);
	pnd = __phonet_get(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;
	spin_unlock_bh(&pndevs->lock);

	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;

	spin_lock_bh(&pndevs->lock);
	list_for_each_entry(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:
	spin_unlock_bh(&pndevs->lock);
	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 = net_generic(dev_net(dev), phonet_net_id);
	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 phonet_init_net(struct net *net)
{
	struct phonet_net *pnn = kzalloc(sizeof(*pnn), GFP_KERNEL);
	if (!pnn)
		return -ENOMEM;

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

	INIT_LIST_HEAD(&pnn->pndevs.list);
	spin_lock_init(&pnn->pndevs.lock);
	mutex_init(&pnn->routes.lock);
	net_assign_generic(net, phonet_net_id, pnn);
	return 0;
}

static void phonet_exit_net(struct net *net)
{
	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	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");
	kfree(pnn);
}

static struct pernet_operations phonet_net_ops = {
	.init = phonet_init_net,
	.exit = phonet_exit_net,
};

/* Initialize Phonet devices list */
int __init phonet_device_init(void)
{
	int err = register_pernet_gen_device(&phonet_net_id, &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_gen_device(phonet_net_id, &phonet_net_ops);
}

int phonet_route_add(struct net_device *dev, u8 daddr)
{
	struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
	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 = net_generic(dev_net(dev), phonet_net_id);
	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 = net_generic(net, phonet_net_id);
	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 = net_generic(net, phonet_net_id);
	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>
	28	#include <linux/netdevice.h>
	29	#include <linux/phonet.h>
421d20a3	30	#include <linux/proc_fs.h>
f5bb1c55	31	#include <linux/if_arp.h>
f8ff6028	32	#include <net/sock.h>
9a3b7a42	33	#include <net/netns/generic.h>
f8ff6028 RDC	34	#include <net/phonet/pn_dev.h>
f8ff6028 RDC	35
55748ac0	36	struct phonet_routes {
88880135	37	struct mutex lock;
55748ac0 RDC	38	struct net_device *table[64];
	39	};
	40
9a3b7a42	41	struct phonet_net {
9a3b7a42	42	struct phonet_device_list pndevs;
55748ac0	43	struct phonet_routes routes;
f8ff6028 RDC	44	};
f8ff6028 RDC	45
f99189b1	46	int phonet_net_id __read_mostly;
9a3b7a42	47
	48	struct phonet_device_list phonet_device_list(struct net net)
	49	{
	50	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	51	return &pnn->pndevs;
	52	}
	53
f8ff6028 RDC	54	/* Allocate new Phonet device. */
	55	static struct phonet_device __phonet_device_alloc(struct net_device dev)
	56	{
9a3b7a42	57	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	58	struct phonet_device pnd = kmalloc(sizeof(pnd), GFP_ATOMIC);
	59	if (pnd == NULL)
	60	return NULL;
	61	pnd->netdev = dev;
	62	bitmap_zero(pnd->addrs, 64);
	63
9a3b7a42	64	list_add(&pnd->list, &pndevs->list);
f8ff6028 RDC	65	return pnd;
	66	}
	67
	68	static struct phonet_device __phonet_get(struct net_device dev)
	69	{
9a3b7a42	70	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	71	struct phonet_device *pnd;
f8ff6028 RDC	72
9a3b7a42	73	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	74	if (pnd->netdev == dev)
	75	return pnd;
	76	}
	77	return NULL;
	78	}
	79
2be6fa4c	80	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	81	{
2be6fa4c RDC	82	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	83	struct phonet_device *pnd;
	84
	85	ASSERT_RTNL();
	86
	87	spin_lock_bh(&pndevs->lock);
	88	pnd = __phonet_get(dev);
	89	if (pnd)
	90	list_del(&pnd->list);
	91	spin_unlock_bh(&pndevs->lock);
	92
	93	if (pnd) {
	94	u8 addr;
	95
	96	for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
	97	addr = find_next_bit(pnd->addrs, 64, 1+addr))
	98	phonet_address_notify(RTM_DELADDR, dev, addr);
	99	kfree(pnd);
	100	}
f8ff6028 RDC	101	}
	102
	103	struct net_device phonet_device_get(struct net net)
	104	{
9a3b7a42	105	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	106	struct phonet_device *pnd;
59e57f44	107	struct net_device *dev = NULL;
f8ff6028	108
9a3b7a42	109	spin_lock_bh(&pndevs->lock);
9a3b7a42	110	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	111	dev = pnd->netdev;
	112	BUG_ON(!dev);
	113
9a3b7a42	114	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	115	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	116	break;
	117	dev = NULL;
	118	}
	119	if (dev)
	120	dev_hold(dev);
9a3b7a42	121	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	122	return dev;
	123	}
	124
	125	int phonet_address_add(struct net_device *dev, u8 addr)
	126	{
9a3b7a42	127	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	128	struct phonet_device *pnd;
	129	int err = 0;
	130
9a3b7a42	131	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	132	/* Find or create Phonet-specific device data */
	133	pnd = __phonet_get(dev);
	134	if (pnd == NULL)
	135	pnd = __phonet_device_alloc(dev);
	136	if (unlikely(pnd == NULL))
	137	err = -ENOMEM;
	138	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	139	err = -EEXIST;
9a3b7a42	140	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	141	return err;
	142	}
	143
	144	int phonet_address_del(struct net_device *dev, u8 addr)
	145	{
9a3b7a42	146	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	147	struct phonet_device *pnd;
	148	int err = 0;
	149
9a3b7a42	150	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	151	pnd = __phonet_get(dev);
	152	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs))
	153	err = -EADDRNOTAVAIL;
2be6fa4c RDC	154	else if (bitmap_empty(pnd->addrs, 64)) {
	155	list_del(&pnd->list);
	156	kfree(pnd);
	157	}
9a3b7a42	158	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	159	return err;
	160	}
	161
	162	/* Gets a source address toward a destination, through a interface. */
55748ac0	163	u8 phonet_address_get(struct net_device *dev, u8 daddr)
f8ff6028	164	{
9a3b7a42	165	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028	166	struct phonet_device *pnd;
55748ac0	167	u8 saddr;
f8ff6028	168
9a3b7a42	169	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	170	pnd = __phonet_get(dev);
	171	if (pnd) {
	172	BUG_ON(bitmap_empty(pnd->addrs, 64));
	173
	174	/* Use same source address as destination, if possible */
55748ac0 RDC	175	if (test_bit(daddr >> 2, pnd->addrs))
	176	saddr = daddr;
	177	else
	178	saddr = find_first_bit(pnd->addrs, 64) << 2;
f8ff6028	179	} else
55748ac0	180	saddr = PN_NO_ADDR;
9a3b7a42	181	spin_unlock_bh(&pndevs->lock);
55748ac0 RDC	182
	183	if (saddr == PN_NO_ADDR) {
	184	/* Fallback to another device */
	185	struct net_device *def_dev;
	186
	187	def_dev = phonet_device_get(dev_net(dev));
	188	if (def_dev) {
	189	if (def_dev != dev)
	190	saddr = phonet_address_get(def_dev, daddr);
	191	dev_put(def_dev);
	192	}
	193	}
	194	return saddr;
f8ff6028 RDC	195	}
f8ff6028 RDC	196
52404881	197	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	198	{
9a3b7a42	199	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	200	struct phonet_device *pnd;
9a3b7a42	201	int err = -EADDRNOTAVAIL;
f8ff6028	202
9a3b7a42	203	spin_lock_bh(&pndevs->lock);
9a3b7a42	204	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	205	/* Don't allow unregistering devices! */
	206	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	207	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	208	continue;
	209
	210	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	211	err = 0;
9a3b7a42	212	goto found;
f8ff6028 RDC	213	}
f8ff6028 RDC	214	}
9a3b7a42	215	found:
	216	spin_unlock_bh(&pndevs->lock);
	217	return err;
f8ff6028 RDC	218	}
f8ff6028 RDC	219
f5bb1c55 RDC	220	/* automatically configure a Phonet device, if supported */
	221	static int phonet_device_autoconf(struct net_device *dev)
	222	{
	223	struct if_phonet_req req;
	224	int ret;
	225
	226	if (!dev->netdev_ops->ndo_do_ioctl)
	227	return -EOPNOTSUPP;
	228
	229	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	230	SIOCPNGAUTOCONF);
	231	if (ret < 0)
	232	return ret;
b11b5165 RDC	233
	234	ASSERT_RTNL();
	235	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	236	if (ret)
	237	return ret;
	238	phonet_address_notify(RTM_NEWADDR, dev,
	239	req.ifr_phonet_autoconf.device);
	240	return 0;
f5bb1c55 RDC	241	}
f5bb1c55 RDC	242
f062f41d RDC	243	static void phonet_route_autodel(struct net_device *dev)
	244	{
	245	struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
	246	unsigned i;
	247	DECLARE_BITMAP(deleted, 64);
	248
	249	/* Remove left-over Phonet routes */
	250	bitmap_zero(deleted, 64);
88880135	251	mutex_lock(&pnn->routes.lock);
f062f41d RDC	252	for (i = 0; i < 64; i++)
f062f41d RDC	253	if (dev == pnn->routes.table[i]) {
88880135	254	rcu_assign_pointer(pnn->routes.table[i], NULL);
f062f41d	255	set_bit(i, deleted);
f062f41d	256	}
88880135 RDC	257	mutex_unlock(&pnn->routes.lock);
	258
	259	if (bitmap_empty(deleted, 64))
	260	return; /* short-circuit RCU */
	261	synchronize_rcu();
f062f41d	262	for (i = find_first_bit(deleted, 64); i < 64;
88880135	263	i = find_next_bit(deleted, 64, i + 1)) {
f062f41d	264	rtm_phonet_notify(RTM_DELROUTE, dev, i);
88880135 RDC	265	dev_put(dev);
88880135 RDC	266	}
f062f41d RDC	267	}
f062f41d RDC	268
f8ff6028 RDC	269	/* notify Phonet of device events */
	270	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	271	void *arg)
	272	{
	273	struct net_device *dev = arg;
	274
f5bb1c55 RDC	275	switch (what) {
	276	case NETDEV_REGISTER:
	277	if (dev->type == ARPHRD_PHONET)
	278	phonet_device_autoconf(dev);
	279	break;
	280	case NETDEV_UNREGISTER:
2be6fa4c	281	phonet_device_destroy(dev);
f062f41d	282	phonet_route_autodel(dev);
f5bb1c55 RDC	283	break;
f5bb1c55 RDC	284	}
f8ff6028 RDC	285	return 0;
	286
	287	}
	288
	289	static struct notifier_block phonet_device_notifier = {
	290	.notifier_call = phonet_device_notify,
	291	.priority = 0,
	292	};
	293
9a3b7a42	294	/* Per-namespace Phonet devices handling */
	295	static int phonet_init_net(struct net *net)
	296	{
55748ac0	297	struct phonet_net pnn = kzalloc(sizeof(pnn), GFP_KERNEL);
9a3b7a42	298	if (!pnn)
	299	return -ENOMEM;
	300
c1dc13e9 RDC	301	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) {
	302	kfree(pnn);
	303	return -ENOMEM;
	304	}
	305
9a3b7a42	306	INIT_LIST_HEAD(&pnn->pndevs.list);
9a3b7a42	307	spin_lock_init(&pnn->pndevs.lock);
88880135	308	mutex_init(&pnn->routes.lock);
9a3b7a42	309	net_assign_generic(net, phonet_net_id, pnn);
	310	return 0;
	311	}
	312
	313	static void phonet_exit_net(struct net *net)
	314	{
	315	struct phonet_net *pnn = net_generic(net, phonet_net_id);
2be6fa4c	316	struct net_device *dev;
f062f41d	317	unsigned i;
9a3b7a42	318
2be6fa4c RDC	319	rtnl_lock();
	320	for_each_netdev(net, dev)
	321	phonet_device_destroy(dev);
f062f41d RDC	322
	323	for (i = 0; i < 64; i++) {
	324	dev = pnn->routes.table[i];
	325	if (dev) {
	326	rtm_phonet_notify(RTM_DELROUTE, dev, i);
	327	dev_put(dev);
	328	}
	329	}
2be6fa4c	330	rtnl_unlock();
c1dc13e9 RDC	331
c1dc13e9 RDC	332	proc_net_remove(net, "phonet");
9a3b7a42	333	kfree(pnn);
	334	}
	335
	336	static struct pernet_operations phonet_net_ops = {
	337	.init = phonet_init_net,
	338	.exit = phonet_exit_net,
	339	};
	340
f8ff6028	341	/* Initialize Phonet devices list */
76e02cf6	342	int __init phonet_device_init(void)
f8ff6028	343	{
9a3b7a42	344	int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
	345	if (err)
	346	return err;
660f706d	347
f8ff6028	348	register_netdevice_notifier(&phonet_device_notifier);
660f706d	349	err = phonet_netlink_register();
	350	if (err)
	351	phonet_device_exit();
	352	return err;
f8ff6028 RDC	353	}
	354
	355	void phonet_device_exit(void)
	356	{
f8ff6028	357	rtnl_unregister_all(PF_PHONET);
6530e0fe	358	unregister_netdevice_notifier(&phonet_device_notifier);
9a3b7a42	359	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
f8ff6028	360	}
55748ac0 RDC	361
	362	int phonet_route_add(struct net_device *dev, u8 daddr)
	363	{
	364	struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
	365	struct phonet_routes *routes = &pnn->routes;
	366	int err = -EEXIST;
	367
	368	daddr = daddr >> 2;
88880135	369	mutex_lock(&routes->lock);
55748ac0	370	if (routes->table[daddr] == NULL) {
88880135	371	rcu_assign_pointer(routes->table[daddr], dev);
55748ac0 RDC	372	dev_hold(dev);
	373	err = 0;
	374	}
88880135	375	mutex_unlock(&routes->lock);
55748ac0 RDC	376	return err;
	377	}
	378
	379	int phonet_route_del(struct net_device *dev, u8 daddr)
	380	{
	381	struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
	382	struct phonet_routes *routes = &pnn->routes;
55748ac0 RDC	383
55748ac0 RDC	384	daddr = daddr >> 2;
88880135 RDC	385	mutex_lock(&routes->lock);
	386	if (dev == routes->table[daddr])
	387	rcu_assign_pointer(routes->table[daddr], NULL);
	388	else
	389	dev = NULL;
	390	mutex_unlock(&routes->lock);
	391
	392	if (!dev)
	393	return -ENOENT;
	394	synchronize_rcu();
	395	dev_put(dev);
	396	return 0;
55748ac0 RDC	397	}
	398
	399	struct net_device phonet_route_get(struct net net, u8 daddr)
	400	{
	401	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	402	struct phonet_routes *routes = &pnn->routes;
	403	struct net_device *dev;
	404
	405	ASSERT_RTNL(); /* no need to hold the device */
	406
	407	daddr >>= 2;
88880135 RDC	408	rcu_read_lock();
	409	dev = rcu_dereference(routes->table[daddr]);
	410	rcu_read_unlock();
55748ac0 RDC	411	return dev;
	412	}
	413
	414	struct net_device phonet_route_output(struct net net, u8 daddr)
	415	{
	416	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	417	struct phonet_routes *routes = &pnn->routes;
	418	struct net_device *dev;
	419
88880135 RDC	420	daddr >>= 2;
	421	rcu_read_lock();
	422	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	423	if (dev)
55748ac0 RDC	424	dev_hold(dev);
88880135	425	rcu_read_unlock();
55748ac0 RDC	426
	427	if (!dev)
	428	dev = phonet_device_get(net); /* Default route */
	429	return dev;
	430	}