[net-next-2.6.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;
}

static void phonet_device_rcu_free(struct rcu_head *head)
{
	struct phonet_device *pnd;

	pnd = container_of(head, struct phonet_device, rcu);
	kfree(pnd);
}

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)
		call_rcu(&pnd->rcu, phonet_device_rcu_free);

	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_each_set_bit(i, deleted, 64) {
		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;

	proc_net_fops_create(&init_net, "pnresource", 0, &pn_res_seq_fops);
	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);
	proc_net_remove(&init_net, "pnresource");
}

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
88e7594a JP	165	static void phonet_device_rcu_free(struct rcu_head *head)
	166	{
	167	struct phonet_device *pnd;
	168
	169	pnd = container_of(head, struct phonet_device, rcu);
	170	kfree(pnd);
	171	}
	172
f8ff6028 RDC	173	int phonet_address_del(struct net_device *dev, u8 addr)
f8ff6028 RDC	174	{
9a3b7a42	175	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	176	struct phonet_device *pnd;
	177	int err = 0;
	178
eeb74a9d	179	mutex_lock(&pndevs->lock);
f8ff6028	180	pnd = __phonet_get(dev);
eeb74a9d	181	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs)) {
f8ff6028	182	err = -EADDRNOTAVAIL;
eeb74a9d RDC	183	pnd = NULL;
	184	} else if (bitmap_empty(pnd->addrs, 64))
	185	list_del_rcu(&pnd->list);
	186	else
	187	pnd = NULL;
	188	mutex_unlock(&pndevs->lock);
	189
88e7594a JP	190	if (pnd)
	191	call_rcu(&pnd->rcu, phonet_device_rcu_free);
	192
f8ff6028 RDC	193	return err;
	194	}
	195
	196	/* Gets a source address toward a destination, through a interface. */
55748ac0	197	u8 phonet_address_get(struct net_device *dev, u8 daddr)
f8ff6028 RDC	198	{
f8ff6028 RDC	199	struct phonet_device *pnd;
55748ac0	200	u8 saddr;
f8ff6028	201
eeb74a9d RDC	202	rcu_read_lock();
eeb74a9d RDC	203	pnd = __phonet_get_rcu(dev);
f8ff6028 RDC	204	if (pnd) {
	205	BUG_ON(bitmap_empty(pnd->addrs, 64));
	206
	207	/* Use same source address as destination, if possible */
55748ac0 RDC	208	if (test_bit(daddr >> 2, pnd->addrs))
	209	saddr = daddr;
	210	else
	211	saddr = find_first_bit(pnd->addrs, 64) << 2;
f8ff6028	212	} else
55748ac0	213	saddr = PN_NO_ADDR;
eeb74a9d	214	rcu_read_unlock();
55748ac0 RDC	215
	216	if (saddr == PN_NO_ADDR) {
	217	/* Fallback to another device */
	218	struct net_device *def_dev;
	219
	220	def_dev = phonet_device_get(dev_net(dev));
	221	if (def_dev) {
	222	if (def_dev != dev)
	223	saddr = phonet_address_get(def_dev, daddr);
	224	dev_put(def_dev);
	225	}
	226	}
	227	return saddr;
f8ff6028 RDC	228	}
f8ff6028 RDC	229
52404881	230	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	231	{
9a3b7a42	232	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	233	struct phonet_device *pnd;
9a3b7a42	234	int err = -EADDRNOTAVAIL;
f8ff6028	235
eeb74a9d RDC	236	rcu_read_lock();
eeb74a9d RDC	237	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	238	/* Don't allow unregistering devices! */
	239	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	240	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	241	continue;
	242
	243	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	244	err = 0;
9a3b7a42	245	goto found;
f8ff6028 RDC	246	}
f8ff6028 RDC	247	}
9a3b7a42	248	found:
eeb74a9d	249	rcu_read_unlock();
9a3b7a42	250	return err;
f8ff6028 RDC	251	}
f8ff6028 RDC	252
f5bb1c55 RDC	253	/* automatically configure a Phonet device, if supported */
	254	static int phonet_device_autoconf(struct net_device *dev)
	255	{
	256	struct if_phonet_req req;
	257	int ret;
	258
	259	if (!dev->netdev_ops->ndo_do_ioctl)
	260	return -EOPNOTSUPP;
	261
	262	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	263	SIOCPNGAUTOCONF);
	264	if (ret < 0)
	265	return ret;
b11b5165 RDC	266
	267	ASSERT_RTNL();
	268	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	269	if (ret)
	270	return ret;
	271	phonet_address_notify(RTM_NEWADDR, dev,
	272	req.ifr_phonet_autoconf.device);
	273	return 0;
f5bb1c55 RDC	274	}
f5bb1c55 RDC	275
f062f41d RDC	276	static void phonet_route_autodel(struct net_device *dev)
f062f41d RDC	277	{
0db3f0f4	278	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
f062f41d RDC	279	unsigned i;
	280	DECLARE_BITMAP(deleted, 64);
	281
	282	/* Remove left-over Phonet routes */
	283	bitmap_zero(deleted, 64);
88880135	284	mutex_lock(&pnn->routes.lock);
f062f41d RDC	285	for (i = 0; i < 64; i++)
f062f41d RDC	286	if (dev == pnn->routes.table[i]) {
88880135	287	rcu_assign_pointer(pnn->routes.table[i], NULL);
f062f41d	288	set_bit(i, deleted);
f062f41d	289	}
88880135 RDC	290	mutex_unlock(&pnn->routes.lock);
	291
	292	if (bitmap_empty(deleted, 64))
	293	return; /* short-circuit RCU */
	294	synchronize_rcu();
6a499b24	295	for_each_set_bit(i, deleted, 64) {
f062f41d	296	rtm_phonet_notify(RTM_DELROUTE, dev, i);
88880135 RDC	297	dev_put(dev);
88880135 RDC	298	}
f062f41d RDC	299	}
f062f41d RDC	300
f8ff6028 RDC	301	/* notify Phonet of device events */
	302	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	303	void *arg)
	304	{
	305	struct net_device *dev = arg;
	306
f5bb1c55 RDC	307	switch (what) {
	308	case NETDEV_REGISTER:
	309	if (dev->type == ARPHRD_PHONET)
	310	phonet_device_autoconf(dev);
	311	break;
	312	case NETDEV_UNREGISTER:
2be6fa4c	313	phonet_device_destroy(dev);
f062f41d	314	phonet_route_autodel(dev);
f5bb1c55 RDC	315	break;
f5bb1c55 RDC	316	}
f8ff6028 RDC	317	return 0;
	318
	319	}
	320
	321	static struct notifier_block phonet_device_notifier = {
	322	.notifier_call = phonet_device_notify,
	323	.priority = 0,
	324	};
	325
9a3b7a42	326	/* Per-namespace Phonet devices handling */
2c8c1e72	327	static int __net_init phonet_init_net(struct net *net)
9a3b7a42	328	{
0db3f0f4	329	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	330
d2b3eb63	331	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops))
c1dc13e9	332	return -ENOMEM;
c1dc13e9	333
9a3b7a42	334	INIT_LIST_HEAD(&pnn->pndevs.list);
eeb74a9d	335	mutex_init(&pnn->pndevs.lock);
88880135	336	mutex_init(&pnn->routes.lock);
9a3b7a42	337	return 0;
	338	}
	339
2c8c1e72	340	static void __net_exit phonet_exit_net(struct net *net)
9a3b7a42	341	{
0db3f0f4	342	struct phonet_net *pnn = phonet_pernet(net);
2be6fa4c	343	struct net_device *dev;
f062f41d	344	unsigned i;
9a3b7a42	345
2be6fa4c RDC	346	rtnl_lock();
	347	for_each_netdev(net, dev)
	348	phonet_device_destroy(dev);
f062f41d RDC	349
	350	for (i = 0; i < 64; i++) {
	351	dev = pnn->routes.table[i];
	352	if (dev) {
	353	rtm_phonet_notify(RTM_DELROUTE, dev, i);
	354	dev_put(dev);
	355	}
	356	}
2be6fa4c	357	rtnl_unlock();
c1dc13e9 RDC	358
c1dc13e9 RDC	359	proc_net_remove(net, "phonet");
9a3b7a42	360	}
	361
	362	static struct pernet_operations phonet_net_ops = {
	363	.init = phonet_init_net,
	364	.exit = phonet_exit_net,
d2b3eb63 EB	365	.id = &phonet_net_id,
d2b3eb63 EB	366	.size = sizeof(struct phonet_net),
9a3b7a42	367	};
9a3b7a42	368
f8ff6028	369	/* Initialize Phonet devices list */
76e02cf6	370	int __init phonet_device_init(void)
f8ff6028	371	{
d2b3eb63	372	int err = register_pernet_device(&phonet_net_ops);
9a3b7a42	373	if (err)
9a3b7a42	374	return err;
660f706d	375
507215f8	376	proc_net_fops_create(&init_net, "pnresource", 0, &pn_res_seq_fops);
f8ff6028	377	register_netdevice_notifier(&phonet_device_notifier);
660f706d	378	err = phonet_netlink_register();
	379	if (err)
	380	phonet_device_exit();
	381	return err;
f8ff6028 RDC	382	}
	383
	384	void phonet_device_exit(void)
	385	{
f8ff6028	386	rtnl_unregister_all(PF_PHONET);
6530e0fe	387	unregister_netdevice_notifier(&phonet_device_notifier);
d2b3eb63	388	unregister_pernet_device(&phonet_net_ops);
507215f8	389	proc_net_remove(&init_net, "pnresource");
f8ff6028	390	}
55748ac0 RDC	391
	392	int phonet_route_add(struct net_device *dev, u8 daddr)
	393	{
0db3f0f4	394	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0 RDC	395	struct phonet_routes *routes = &pnn->routes;
	396	int err = -EEXIST;
	397
	398	daddr = daddr >> 2;
88880135	399	mutex_lock(&routes->lock);
55748ac0	400	if (routes->table[daddr] == NULL) {
88880135	401	rcu_assign_pointer(routes->table[daddr], dev);
55748ac0 RDC	402	dev_hold(dev);
	403	err = 0;
	404	}
88880135	405	mutex_unlock(&routes->lock);
55748ac0 RDC	406	return err;
	407	}
	408
	409	int phonet_route_del(struct net_device *dev, u8 daddr)
	410	{
0db3f0f4	411	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0	412	struct phonet_routes *routes = &pnn->routes;
55748ac0 RDC	413
55748ac0 RDC	414	daddr = daddr >> 2;
88880135 RDC	415	mutex_lock(&routes->lock);
	416	if (dev == routes->table[daddr])
	417	rcu_assign_pointer(routes->table[daddr], NULL);
	418	else
	419	dev = NULL;
	420	mutex_unlock(&routes->lock);
	421
	422	if (!dev)
	423	return -ENOENT;
	424	synchronize_rcu();
	425	dev_put(dev);
	426	return 0;
55748ac0 RDC	427	}
	428
	429	struct net_device phonet_route_get(struct net net, u8 daddr)
	430	{
0db3f0f4	431	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	432	struct phonet_routes *routes = &pnn->routes;
	433	struct net_device *dev;
	434
	435	ASSERT_RTNL(); /* no need to hold the device */
	436
	437	daddr >>= 2;
88880135 RDC	438	rcu_read_lock();
	439	dev = rcu_dereference(routes->table[daddr]);
	440	rcu_read_unlock();
55748ac0 RDC	441	return dev;
	442	}
	443
	444	struct net_device phonet_route_output(struct net net, u8 daddr)
	445	{
0db3f0f4	446	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	447	struct phonet_routes *routes = &pnn->routes;
	448	struct net_device *dev;
	449
88880135 RDC	450	daddr >>= 2;
	451	rcu_read_lock();
	452	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	453	if (dev)
55748ac0 RDC	454	dev_hold(dev);
88880135	455	rcu_read_unlock();
55748ac0 RDC	456
	457	if (!dev)
	458	dev = phonet_device_get(net); /* Default route */
	459	return dev;
	460	}