[mirror_ubuntu-bionic-kernel.git] / net / phonet / pn_dev.c

/*
 * File: pn_dev.c
 *
 * Phonet network device
 *
 * Copyright (C) 2008 Nokia Corporation.
 *
 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
 *          Rémi Denis-Courmont
 *
 * 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 __rcu	*table[64];
};

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

static unsigned 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)
		kfree_rcu(pnd, rcu);

	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 int 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 (rcu_access_pointer(pnn->routes.table[i]) == dev) {
			RCU_INIT_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 *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

	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_create("phonet", 0, net->proc_net, &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);

	remove_proc_entry("phonet", net->proc_net);
	WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
}

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_subsys(&phonet_net_ops);
	if (err)
		return err;

	proc_create("pnresource", 0, init_net.proc_net, &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_subsys(&phonet_net_ops);
	remove_proc_entry("pnresource", init_net.proc_net);
}

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 (rcu_access_pointer(routes->table[daddr]) == dev)
		RCU_INIT_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_rcu(struct net *net, u8 daddr)
{
	struct phonet_net *pnn = phonet_pernet(net);
	struct phonet_routes *routes = &pnn->routes;
	struct net_device *dev;

	daddr >>= 2;
	dev = rcu_dereference(routes->table[daddr]);
	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	*
31fdc555 RDC	8	* Authors: Sakari Ailus <sakari.ailus@nokia.com>
31fdc555 RDC	9	* Rémi Denis-Courmont
f8ff6028 RDC	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;
79952bca	39	struct net_device __rcu *table[64];
55748ac0 RDC	40	};
55748ac0 RDC	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
c7d03a00	47	static unsigned 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
88e7594a	182	if (pnd)
7e113a9c	183	kfree_rcu(pnd, rcu);
88e7594a	184
f8ff6028 RDC	185	return err;
	186	}
	187
	188	/* Gets a source address toward a destination, through a interface. */
55748ac0	189	u8 phonet_address_get(struct net_device *dev, u8 daddr)
f8ff6028 RDC	190	{
f8ff6028 RDC	191	struct phonet_device *pnd;
55748ac0	192	u8 saddr;
f8ff6028	193
eeb74a9d RDC	194	rcu_read_lock();
eeb74a9d RDC	195	pnd = __phonet_get_rcu(dev);
f8ff6028 RDC	196	if (pnd) {
	197	BUG_ON(bitmap_empty(pnd->addrs, 64));
	198
	199	/* Use same source address as destination, if possible */
55748ac0 RDC	200	if (test_bit(daddr >> 2, pnd->addrs))
	201	saddr = daddr;
	202	else
	203	saddr = find_first_bit(pnd->addrs, 64) << 2;
f8ff6028	204	} else
55748ac0	205	saddr = PN_NO_ADDR;
eeb74a9d	206	rcu_read_unlock();
55748ac0 RDC	207
	208	if (saddr == PN_NO_ADDR) {
	209	/* Fallback to another device */
	210	struct net_device *def_dev;
	211
	212	def_dev = phonet_device_get(dev_net(dev));
	213	if (def_dev) {
	214	if (def_dev != dev)
	215	saddr = phonet_address_get(def_dev, daddr);
	216	dev_put(def_dev);
	217	}
	218	}
	219	return saddr;
f8ff6028 RDC	220	}
f8ff6028 RDC	221
52404881	222	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	223	{
9a3b7a42	224	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	225	struct phonet_device *pnd;
9a3b7a42	226	int err = -EADDRNOTAVAIL;
f8ff6028	227
eeb74a9d RDC	228	rcu_read_lock();
eeb74a9d RDC	229	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	230	/* Don't allow unregistering devices! */
	231	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	232	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	233	continue;
	234
	235	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	236	err = 0;
9a3b7a42	237	goto found;
f8ff6028 RDC	238	}
f8ff6028 RDC	239	}
9a3b7a42	240	found:
eeb74a9d	241	rcu_read_unlock();
9a3b7a42	242	return err;
f8ff6028 RDC	243	}
f8ff6028 RDC	244
f5bb1c55 RDC	245	/* automatically configure a Phonet device, if supported */
	246	static int phonet_device_autoconf(struct net_device *dev)
	247	{
	248	struct if_phonet_req req;
	249	int ret;
	250
	251	if (!dev->netdev_ops->ndo_do_ioctl)
	252	return -EOPNOTSUPP;
	253
	254	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	255	SIOCPNGAUTOCONF);
	256	if (ret < 0)
	257	return ret;
b11b5165 RDC	258
	259	ASSERT_RTNL();
	260	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	261	if (ret)
	262	return ret;
	263	phonet_address_notify(RTM_NEWADDR, dev,
	264	req.ifr_phonet_autoconf.device);
	265	return 0;
f5bb1c55 RDC	266	}
f5bb1c55 RDC	267
f062f41d RDC	268	static void phonet_route_autodel(struct net_device *dev)
f062f41d RDC	269	{
0db3f0f4	270	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
95c96174	271	unsigned int i;
f062f41d RDC	272	DECLARE_BITMAP(deleted, 64);
	273
	274	/* Remove left-over Phonet routes */
	275	bitmap_zero(deleted, 64);
88880135	276	mutex_lock(&pnn->routes.lock);
f062f41d	277	for (i = 0; i < 64; i++)
79952bca	278	if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
a9b3cd7f	279	RCU_INIT_POINTER(pnn->routes.table[i], NULL);
f062f41d	280	set_bit(i, deleted);
f062f41d	281	}
88880135 RDC	282	mutex_unlock(&pnn->routes.lock);
	283
	284	if (bitmap_empty(deleted, 64))
	285	return; /* short-circuit RCU */
	286	synchronize_rcu();
6a499b24	287	for_each_set_bit(i, deleted, 64) {
f062f41d	288	rtm_phonet_notify(RTM_DELROUTE, dev, i);
88880135 RDC	289	dev_put(dev);
88880135 RDC	290	}
f062f41d RDC	291	}
f062f41d RDC	292
f8ff6028 RDC	293	/* notify Phonet of device events */
f8ff6028 RDC	294	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
351638e7	295	void *ptr)
f8ff6028	296	{
351638e7	297	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
f8ff6028	298
f5bb1c55 RDC	299	switch (what) {
	300	case NETDEV_REGISTER:
	301	if (dev->type == ARPHRD_PHONET)
	302	phonet_device_autoconf(dev);
	303	break;
	304	case NETDEV_UNREGISTER:
2be6fa4c	305	phonet_device_destroy(dev);
f062f41d	306	phonet_route_autodel(dev);
f5bb1c55 RDC	307	break;
f5bb1c55 RDC	308	}
f8ff6028 RDC	309	return 0;
	310
	311	}
	312
	313	static struct notifier_block phonet_device_notifier = {
	314	.notifier_call = phonet_device_notify,
	315	.priority = 0,
	316	};
	317
9a3b7a42	318	/* Per-namespace Phonet devices handling */
2c8c1e72	319	static int __net_init phonet_init_net(struct net *net)
9a3b7a42	320	{
0db3f0f4	321	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	322
d4beaa66	323	if (!proc_create("phonet", 0, net->proc_net, &pn_sock_seq_fops))
c1dc13e9	324	return -ENOMEM;
c1dc13e9	325
9a3b7a42	326	INIT_LIST_HEAD(&pnn->pndevs.list);
eeb74a9d	327	mutex_init(&pnn->pndevs.lock);
88880135	328	mutex_init(&pnn->routes.lock);
9a3b7a42	329	return 0;
	330	}
	331
2c8c1e72	332	static void __net_exit phonet_exit_net(struct net *net)
9a3b7a42	333	{
ae61e8cd VA	334	struct phonet_net *pnn = phonet_pernet(net);
ae61e8cd VA	335
ece31ffd	336	remove_proc_entry("phonet", net->proc_net);
ae61e8cd	337	WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
9a3b7a42	338	}
	339
	340	static struct pernet_operations phonet_net_ops = {
	341	.init = phonet_init_net,
	342	.exit = phonet_exit_net,
d2b3eb63 EB	343	.id = &phonet_net_id,
d2b3eb63 EB	344	.size = sizeof(struct phonet_net),
9a3b7a42	345	};
9a3b7a42	346
f8ff6028	347	/* Initialize Phonet devices list */
76e02cf6	348	int __init phonet_device_init(void)
f8ff6028	349	{
03478756	350	int err = register_pernet_subsys(&phonet_net_ops);
9a3b7a42	351	if (err)
9a3b7a42	352	return err;
660f706d	353
d4beaa66	354	proc_create("pnresource", 0, init_net.proc_net, &pn_res_seq_fops);
f8ff6028	355	register_netdevice_notifier(&phonet_device_notifier);
660f706d	356	err = phonet_netlink_register();
	357	if (err)
	358	phonet_device_exit();
	359	return err;
f8ff6028 RDC	360	}
	361
	362	void phonet_device_exit(void)
	363	{
f8ff6028	364	rtnl_unregister_all(PF_PHONET);
6530e0fe	365	unregister_netdevice_notifier(&phonet_device_notifier);
03478756	366	unregister_pernet_subsys(&phonet_net_ops);
ece31ffd	367	remove_proc_entry("pnresource", init_net.proc_net);
f8ff6028	368	}
55748ac0 RDC	369
	370	int phonet_route_add(struct net_device *dev, u8 daddr)
	371	{
0db3f0f4	372	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0 RDC	373	struct phonet_routes *routes = &pnn->routes;
	374	int err = -EEXIST;
	375
	376	daddr = daddr >> 2;
88880135	377	mutex_lock(&routes->lock);
55748ac0	378	if (routes->table[daddr] == NULL) {
cf778b00	379	rcu_assign_pointer(routes->table[daddr], dev);
55748ac0 RDC	380	dev_hold(dev);
	381	err = 0;
	382	}
88880135	383	mutex_unlock(&routes->lock);
55748ac0 RDC	384	return err;
	385	}
	386
	387	int phonet_route_del(struct net_device *dev, u8 daddr)
	388	{
0db3f0f4	389	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0	390	struct phonet_routes *routes = &pnn->routes;
55748ac0 RDC	391
55748ac0 RDC	392	daddr = daddr >> 2;
88880135	393	mutex_lock(&routes->lock);
79952bca	394	if (rcu_access_pointer(routes->table[daddr]) == dev)
a9b3cd7f	395	RCU_INIT_POINTER(routes->table[daddr], NULL);
88880135 RDC	396	else
	397	dev = NULL;
	398	mutex_unlock(&routes->lock);
	399
	400	if (!dev)
	401	return -ENOENT;
	402	synchronize_rcu();
	403	dev_put(dev);
	404	return 0;
55748ac0 RDC	405	}
55748ac0 RDC	406
e67f88dd	407	struct net_device phonet_route_get_rcu(struct net net, u8 daddr)
55748ac0	408	{
0db3f0f4	409	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	410	struct phonet_routes *routes = &pnn->routes;
	411	struct net_device *dev;
	412
55748ac0	413	daddr >>= 2;
88880135	414	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	415	return dev;
	416	}
	417
	418	struct net_device phonet_route_output(struct net net, u8 daddr)
	419	{
0db3f0f4	420	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	421	struct phonet_routes *routes = &pnn->routes;
	422	struct net_device *dev;
	423
88880135 RDC	424	daddr >>= 2;
	425	rcu_read_lock();
	426	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	427	if (dev)
55748ac0 RDC	428	dev_hold(dev);
88880135	429	rcu_read_unlock();
55748ac0 RDC	430
	431	if (!dev)
	432	dev = phonet_device_get(net); /* Default route */
	433	return dev;
	434	}