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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * File: pn_dev.c
 *
 * Phonet network device
 *
 * Copyright (C) 2008 Nokia Corporation.
 *
 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
 *          Rémi Denis-Courmont
 */

#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)
{
	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_net("phonet", 0, net->proc_net, &pn_sock_seq_ops,
			sizeof(struct seq_net_private)))
		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_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops,
			sizeof(struct seq_net_private));
	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
2b27bdcc	1	// SPDX-License-Identifier: GPL-2.0-only
f8ff6028 RDC	2	/*
	3	* File: pn_dev.c
	4	*
	5	* Phonet network device
	6	*
	7	* Copyright (C) 2008 Nokia Corporation.
	8	*
31fdc555 RDC	9	* Authors: Sakari Ailus <sakari.ailus@nokia.com>
31fdc555 RDC	10	* Rémi Denis-Courmont
f8ff6028 RDC	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/net.h>
5a0e3ad6	15	#include <linux/slab.h>
f8ff6028 RDC	16	#include <linux/netdevice.h>
f8ff6028 RDC	17	#include <linux/phonet.h>
421d20a3	18	#include <linux/proc_fs.h>
f5bb1c55	19	#include <linux/if_arp.h>
f8ff6028	20	#include <net/sock.h>
9a3b7a42	21	#include <net/netns/generic.h>
f8ff6028 RDC	22	#include <net/phonet/pn_dev.h>
f8ff6028 RDC	23
55748ac0	24	struct phonet_routes {
88880135	25	struct mutex lock;
79952bca	26	struct net_device __rcu *table[64];
55748ac0 RDC	27	};
55748ac0 RDC	28
9a3b7a42	29	struct phonet_net {
9a3b7a42	30	struct phonet_device_list pndevs;
55748ac0	31	struct phonet_routes routes;
f8ff6028 RDC	32	};
f8ff6028 RDC	33
c7d03a00	34	static unsigned int phonet_net_id __read_mostly;
9a3b7a42	35
0db3f0f4 JP	36	static struct phonet_net phonet_pernet(struct net net)
0db3f0f4 JP	37	{
0db3f0f4 JP	38	return net_generic(net, phonet_net_id);
	39	}
	40
9a3b7a42	41	struct phonet_device_list phonet_device_list(struct net net)
9a3b7a42	42	{
0db3f0f4	43	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	44	return &pnn->pndevs;
	45	}
	46
f8ff6028 RDC	47	/* Allocate new Phonet device. */
	48	static struct phonet_device __phonet_device_alloc(struct net_device dev)
	49	{
9a3b7a42	50	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	51	struct phonet_device pnd = kmalloc(sizeof(pnd), GFP_ATOMIC);
	52	if (pnd == NULL)
	53	return NULL;
	54	pnd->netdev = dev;
	55	bitmap_zero(pnd->addrs, 64);
	56
eeb74a9d RDC	57	BUG_ON(!mutex_is_locked(&pndevs->lock));
eeb74a9d RDC	58	list_add_rcu(&pnd->list, &pndevs->list);
f8ff6028 RDC	59	return pnd;
	60	}
	61
	62	static struct phonet_device __phonet_get(struct net_device dev)
	63	{
9a3b7a42	64	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	65	struct phonet_device *pnd;
f8ff6028 RDC	66
eeb74a9d	67	BUG_ON(!mutex_is_locked(&pndevs->lock));
9a3b7a42	68	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	69	if (pnd->netdev == dev)
	70	return pnd;
	71	}
	72	return NULL;
	73	}
	74
eeb74a9d RDC	75	static struct phonet_device __phonet_get_rcu(struct net_device dev)
	76	{
	77	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	78	struct phonet_device *pnd;
	79
	80	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
	81	if (pnd->netdev == dev)
	82	return pnd;
	83	}
	84	return NULL;
	85	}
	86
2be6fa4c	87	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	88	{
2be6fa4c RDC	89	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	90	struct phonet_device *pnd;
	91
	92	ASSERT_RTNL();
	93
eeb74a9d	94	mutex_lock(&pndevs->lock);
2be6fa4c RDC	95	pnd = __phonet_get(dev);
2be6fa4c RDC	96	if (pnd)
eeb74a9d RDC	97	list_del_rcu(&pnd->list);
eeb74a9d RDC	98	mutex_unlock(&pndevs->lock);
2be6fa4c RDC	99
	100	if (pnd) {
	101	u8 addr;
	102
a1ca14ac	103	for_each_set_bit(addr, pnd->addrs, 64)
2be6fa4c RDC	104	phonet_address_notify(RTM_DELADDR, dev, addr);
	105	kfree(pnd);
	106	}
f8ff6028 RDC	107	}
	108
	109	struct net_device phonet_device_get(struct net net)
	110	{
9a3b7a42	111	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	112	struct phonet_device *pnd;
59e57f44	113	struct net_device *dev = NULL;
f8ff6028	114
eeb74a9d RDC	115	rcu_read_lock();
eeb74a9d RDC	116	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	117	dev = pnd->netdev;
	118	BUG_ON(!dev);
	119
9a3b7a42	120	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	121	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	122	break;
	123	dev = NULL;
	124	}
	125	if (dev)
	126	dev_hold(dev);
eeb74a9d	127	rcu_read_unlock();
f8ff6028 RDC	128	return dev;
	129	}
	130
	131	int phonet_address_add(struct net_device *dev, u8 addr)
	132	{
9a3b7a42	133	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	134	struct phonet_device *pnd;
	135	int err = 0;
	136
eeb74a9d	137	mutex_lock(&pndevs->lock);
f8ff6028 RDC	138	/* Find or create Phonet-specific device data */
	139	pnd = __phonet_get(dev);
	140	if (pnd == NULL)
	141	pnd = __phonet_device_alloc(dev);
	142	if (unlikely(pnd == NULL))
	143	err = -ENOMEM;
	144	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	145	err = -EEXIST;
eeb74a9d	146	mutex_unlock(&pndevs->lock);
f8ff6028 RDC	147	return err;
	148	}
	149
	150	int phonet_address_del(struct net_device *dev, u8 addr)
	151	{
9a3b7a42	152	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	153	struct phonet_device *pnd;
	154	int err = 0;
	155
eeb74a9d	156	mutex_lock(&pndevs->lock);
f8ff6028	157	pnd = __phonet_get(dev);
eeb74a9d	158	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs)) {
f8ff6028	159	err = -EADDRNOTAVAIL;
eeb74a9d RDC	160	pnd = NULL;
	161	} else if (bitmap_empty(pnd->addrs, 64))
	162	list_del_rcu(&pnd->list);
	163	else
	164	pnd = NULL;
	165	mutex_unlock(&pndevs->lock);
	166
88e7594a	167	if (pnd)
7e113a9c	168	kfree_rcu(pnd, rcu);
88e7594a	169
f8ff6028 RDC	170	return err;
	171	}
	172
	173	/* Gets a source address toward a destination, through a interface. */
55748ac0	174	u8 phonet_address_get(struct net_device *dev, u8 daddr)
f8ff6028 RDC	175	{
f8ff6028 RDC	176	struct phonet_device *pnd;
55748ac0	177	u8 saddr;
f8ff6028	178
eeb74a9d RDC	179	rcu_read_lock();
eeb74a9d RDC	180	pnd = __phonet_get_rcu(dev);
f8ff6028 RDC	181	if (pnd) {
	182	BUG_ON(bitmap_empty(pnd->addrs, 64));
	183
	184	/* Use same source address as destination, if possible */
55748ac0 RDC	185	if (test_bit(daddr >> 2, pnd->addrs))
	186	saddr = daddr;
	187	else
	188	saddr = find_first_bit(pnd->addrs, 64) << 2;
f8ff6028	189	} else
55748ac0	190	saddr = PN_NO_ADDR;
eeb74a9d	191	rcu_read_unlock();
55748ac0 RDC	192
	193	if (saddr == PN_NO_ADDR) {
	194	/* Fallback to another device */
	195	struct net_device *def_dev;
	196
	197	def_dev = phonet_device_get(dev_net(dev));
	198	if (def_dev) {
	199	if (def_dev != dev)
	200	saddr = phonet_address_get(def_dev, daddr);
	201	dev_put(def_dev);
	202	}
	203	}
	204	return saddr;
f8ff6028 RDC	205	}
f8ff6028 RDC	206
52404881	207	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	208	{
9a3b7a42	209	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	210	struct phonet_device *pnd;
9a3b7a42	211	int err = -EADDRNOTAVAIL;
f8ff6028	212
eeb74a9d RDC	213	rcu_read_lock();
eeb74a9d RDC	214	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	215	/* Don't allow unregistering devices! */
	216	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	217	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	218	continue;
	219
	220	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	221	err = 0;
9a3b7a42	222	goto found;
f8ff6028 RDC	223	}
f8ff6028 RDC	224	}
9a3b7a42	225	found:
eeb74a9d	226	rcu_read_unlock();
9a3b7a42	227	return err;
f8ff6028 RDC	228	}
f8ff6028 RDC	229
f5bb1c55 RDC	230	/* automatically configure a Phonet device, if supported */
	231	static int phonet_device_autoconf(struct net_device *dev)
	232	{
	233	struct if_phonet_req req;
	234	int ret;
	235
	236	if (!dev->netdev_ops->ndo_do_ioctl)
	237	return -EOPNOTSUPP;
	238
	239	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	240	SIOCPNGAUTOCONF);
	241	if (ret < 0)
	242	return ret;
b11b5165 RDC	243
	244	ASSERT_RTNL();
	245	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	246	if (ret)
	247	return ret;
	248	phonet_address_notify(RTM_NEWADDR, dev,
	249	req.ifr_phonet_autoconf.device);
	250	return 0;
f5bb1c55 RDC	251	}
f5bb1c55 RDC	252
f062f41d RDC	253	static void phonet_route_autodel(struct net_device *dev)
f062f41d RDC	254	{
0db3f0f4	255	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
95c96174	256	unsigned int i;
f062f41d RDC	257	DECLARE_BITMAP(deleted, 64);
	258
	259	/* Remove left-over Phonet routes */
	260	bitmap_zero(deleted, 64);
88880135	261	mutex_lock(&pnn->routes.lock);
f062f41d	262	for (i = 0; i < 64; i++)
79952bca	263	if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
a9b3cd7f	264	RCU_INIT_POINTER(pnn->routes.table[i], NULL);
f062f41d	265	set_bit(i, deleted);
f062f41d	266	}
88880135 RDC	267	mutex_unlock(&pnn->routes.lock);
	268
	269	if (bitmap_empty(deleted, 64))
	270	return; /* short-circuit RCU */
	271	synchronize_rcu();
6a499b24	272	for_each_set_bit(i, deleted, 64) {
f062f41d	273	rtm_phonet_notify(RTM_DELROUTE, dev, i);
88880135 RDC	274	dev_put(dev);
88880135 RDC	275	}
f062f41d RDC	276	}
f062f41d RDC	277
f8ff6028 RDC	278	/* notify Phonet of device events */
f8ff6028 RDC	279	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
351638e7	280	void *ptr)
f8ff6028	281	{
351638e7	282	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
f8ff6028	283
f5bb1c55 RDC	284	switch (what) {
	285	case NETDEV_REGISTER:
	286	if (dev->type == ARPHRD_PHONET)
	287	phonet_device_autoconf(dev);
	288	break;
	289	case NETDEV_UNREGISTER:
2be6fa4c	290	phonet_device_destroy(dev);
f062f41d	291	phonet_route_autodel(dev);
f5bb1c55 RDC	292	break;
f5bb1c55 RDC	293	}
f8ff6028 RDC	294	return 0;
	295
	296	}
	297
	298	static struct notifier_block phonet_device_notifier = {
	299	.notifier_call = phonet_device_notify,
	300	.priority = 0,
	301	};
	302
9a3b7a42	303	/* Per-namespace Phonet devices handling */
2c8c1e72	304	static int __net_init phonet_init_net(struct net *net)
9a3b7a42	305	{
0db3f0f4	306	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	307
c3506372 CH	308	if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops,
c3506372 CH	309	sizeof(struct seq_net_private)))
c1dc13e9	310	return -ENOMEM;
c1dc13e9	311
9a3b7a42	312	INIT_LIST_HEAD(&pnn->pndevs.list);
eeb74a9d	313	mutex_init(&pnn->pndevs.lock);
88880135	314	mutex_init(&pnn->routes.lock);
9a3b7a42	315	return 0;
	316	}
	317
2c8c1e72	318	static void __net_exit phonet_exit_net(struct net *net)
9a3b7a42	319	{
ae61e8cd VA	320	struct phonet_net *pnn = phonet_pernet(net);
ae61e8cd VA	321
ece31ffd	322	remove_proc_entry("phonet", net->proc_net);
ae61e8cd	323	WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
9a3b7a42	324	}
	325
	326	static struct pernet_operations phonet_net_ops = {
	327	.init = phonet_init_net,
	328	.exit = phonet_exit_net,
d2b3eb63 EB	329	.id = &phonet_net_id,
d2b3eb63 EB	330	.size = sizeof(struct phonet_net),
9a3b7a42	331	};
9a3b7a42	332
f8ff6028	333	/* Initialize Phonet devices list */
76e02cf6	334	int __init phonet_device_init(void)
f8ff6028	335	{
03478756	336	int err = register_pernet_subsys(&phonet_net_ops);
9a3b7a42	337	if (err)
9a3b7a42	338	return err;
660f706d	339
c3506372 CH	340	proc_create_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops,
c3506372 CH	341	sizeof(struct seq_net_private));
f8ff6028	342	register_netdevice_notifier(&phonet_device_notifier);
660f706d	343	err = phonet_netlink_register();
	344	if (err)
	345	phonet_device_exit();
	346	return err;
f8ff6028 RDC	347	}
	348
	349	void phonet_device_exit(void)
	350	{
f8ff6028	351	rtnl_unregister_all(PF_PHONET);
6530e0fe	352	unregister_netdevice_notifier(&phonet_device_notifier);
03478756	353	unregister_pernet_subsys(&phonet_net_ops);
ece31ffd	354	remove_proc_entry("pnresource", init_net.proc_net);
f8ff6028	355	}
55748ac0 RDC	356
	357	int phonet_route_add(struct net_device *dev, u8 daddr)
	358	{
0db3f0f4	359	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0 RDC	360	struct phonet_routes *routes = &pnn->routes;
	361	int err = -EEXIST;
	362
	363	daddr = daddr >> 2;
88880135	364	mutex_lock(&routes->lock);
55748ac0	365	if (routes->table[daddr] == NULL) {
cf778b00	366	rcu_assign_pointer(routes->table[daddr], dev);
55748ac0 RDC	367	dev_hold(dev);
	368	err = 0;
	369	}
88880135	370	mutex_unlock(&routes->lock);
55748ac0 RDC	371	return err;
	372	}
	373
	374	int phonet_route_del(struct net_device *dev, u8 daddr)
	375	{
0db3f0f4	376	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0	377	struct phonet_routes *routes = &pnn->routes;
55748ac0 RDC	378
55748ac0 RDC	379	daddr = daddr >> 2;
88880135	380	mutex_lock(&routes->lock);
79952bca	381	if (rcu_access_pointer(routes->table[daddr]) == dev)
a9b3cd7f	382	RCU_INIT_POINTER(routes->table[daddr], NULL);
88880135 RDC	383	else
	384	dev = NULL;
	385	mutex_unlock(&routes->lock);
	386
	387	if (!dev)
	388	return -ENOENT;
	389	synchronize_rcu();
	390	dev_put(dev);
	391	return 0;
55748ac0 RDC	392	}
55748ac0 RDC	393
e67f88dd	394	struct net_device phonet_route_get_rcu(struct net net, u8 daddr)
55748ac0	395	{
0db3f0f4	396	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	397	struct phonet_routes *routes = &pnn->routes;
	398	struct net_device *dev;
	399
55748ac0	400	daddr >>= 2;
88880135	401	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	402	return dev;
	403	}
	404
	405	struct net_device phonet_route_output(struct net net, u8 daddr)
	406	{
0db3f0f4	407	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	408	struct phonet_routes *routes = &pnn->routes;
	409	struct net_device *dev;
	410
88880135 RDC	411	daddr >>= 2;
	412	rcu_read_lock();
	413	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	414	if (dev)
55748ac0 RDC	415	dev_hold(dev);
88880135	416	rcu_read_unlock();
55748ac0 RDC	417
	418	if (!dev)
	419	dev = phonet_device_get(net); /* Default route */
	420	return dev;
	421	}