[linux-2.6-block.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)
{
	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_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)
	37	{
	38	BUG_ON(!net);
	39
	40	return net_generic(net, phonet_net_id);
	41	}
	42
9a3b7a42	43	struct phonet_device_list phonet_device_list(struct net net)
9a3b7a42	44	{
0db3f0f4	45	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	46	return &pnn->pndevs;
	47	}
	48
f8ff6028 RDC	49	/* Allocate new Phonet device. */
	50	static struct phonet_device __phonet_device_alloc(struct net_device dev)
	51	{
9a3b7a42	52	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	53	struct phonet_device pnd = kmalloc(sizeof(pnd), GFP_ATOMIC);
	54	if (pnd == NULL)
	55	return NULL;
	56	pnd->netdev = dev;
	57	bitmap_zero(pnd->addrs, 64);
	58
eeb74a9d RDC	59	BUG_ON(!mutex_is_locked(&pndevs->lock));
eeb74a9d RDC	60	list_add_rcu(&pnd->list, &pndevs->list);
f8ff6028 RDC	61	return pnd;
	62	}
	63
	64	static struct phonet_device __phonet_get(struct net_device dev)
	65	{
9a3b7a42	66	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	67	struct phonet_device *pnd;
f8ff6028 RDC	68
eeb74a9d	69	BUG_ON(!mutex_is_locked(&pndevs->lock));
9a3b7a42	70	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	71	if (pnd->netdev == dev)
	72	return pnd;
	73	}
	74	return NULL;
	75	}
	76
eeb74a9d RDC	77	static struct phonet_device __phonet_get_rcu(struct net_device dev)
	78	{
	79	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	80	struct phonet_device *pnd;
	81
	82	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
	83	if (pnd->netdev == dev)
	84	return pnd;
	85	}
	86	return NULL;
	87	}
	88
2be6fa4c	89	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	90	{
2be6fa4c RDC	91	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	92	struct phonet_device *pnd;
	93
	94	ASSERT_RTNL();
	95
eeb74a9d	96	mutex_lock(&pndevs->lock);
2be6fa4c RDC	97	pnd = __phonet_get(dev);
2be6fa4c RDC	98	if (pnd)
eeb74a9d RDC	99	list_del_rcu(&pnd->list);
eeb74a9d RDC	100	mutex_unlock(&pndevs->lock);
2be6fa4c RDC	101
	102	if (pnd) {
	103	u8 addr;
	104
a1ca14ac	105	for_each_set_bit(addr, pnd->addrs, 64)
2be6fa4c RDC	106	phonet_address_notify(RTM_DELADDR, dev, addr);
	107	kfree(pnd);
	108	}
f8ff6028 RDC	109	}
	110
	111	struct net_device phonet_device_get(struct net net)
	112	{
9a3b7a42	113	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	114	struct phonet_device *pnd;
59e57f44	115	struct net_device *dev = NULL;
f8ff6028	116
eeb74a9d RDC	117	rcu_read_lock();
eeb74a9d RDC	118	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	119	dev = pnd->netdev;
	120	BUG_ON(!dev);
	121
9a3b7a42	122	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	123	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	124	break;
	125	dev = NULL;
	126	}
	127	if (dev)
	128	dev_hold(dev);
eeb74a9d	129	rcu_read_unlock();
f8ff6028 RDC	130	return dev;
	131	}
	132
	133	int phonet_address_add(struct net_device *dev, u8 addr)
	134	{
9a3b7a42	135	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	136	struct phonet_device *pnd;
	137	int err = 0;
	138
eeb74a9d	139	mutex_lock(&pndevs->lock);
f8ff6028 RDC	140	/* Find or create Phonet-specific device data */
	141	pnd = __phonet_get(dev);
	142	if (pnd == NULL)
	143	pnd = __phonet_device_alloc(dev);
	144	if (unlikely(pnd == NULL))
	145	err = -ENOMEM;
	146	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	147	err = -EEXIST;
eeb74a9d	148	mutex_unlock(&pndevs->lock);
f8ff6028 RDC	149	return err;
	150	}
	151
	152	int phonet_address_del(struct net_device *dev, u8 addr)
	153	{
9a3b7a42	154	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	155	struct phonet_device *pnd;
	156	int err = 0;
	157
eeb74a9d	158	mutex_lock(&pndevs->lock);
f8ff6028	159	pnd = __phonet_get(dev);
eeb74a9d	160	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs)) {
f8ff6028	161	err = -EADDRNOTAVAIL;
eeb74a9d RDC	162	pnd = NULL;
	163	} else if (bitmap_empty(pnd->addrs, 64))
	164	list_del_rcu(&pnd->list);
	165	else
	166	pnd = NULL;
	167	mutex_unlock(&pndevs->lock);
	168
88e7594a	169	if (pnd)
7e113a9c	170	kfree_rcu(pnd, rcu);
88e7594a	171
f8ff6028 RDC	172	return err;
	173	}
	174
	175	/* Gets a source address toward a destination, through a interface. */
55748ac0	176	u8 phonet_address_get(struct net_device *dev, u8 daddr)
f8ff6028 RDC	177	{
f8ff6028 RDC	178	struct phonet_device *pnd;
55748ac0	179	u8 saddr;
f8ff6028	180
eeb74a9d RDC	181	rcu_read_lock();
eeb74a9d RDC	182	pnd = __phonet_get_rcu(dev);
f8ff6028 RDC	183	if (pnd) {
	184	BUG_ON(bitmap_empty(pnd->addrs, 64));
	185
	186	/* Use same source address as destination, if possible */
55748ac0 RDC	187	if (test_bit(daddr >> 2, pnd->addrs))
	188	saddr = daddr;
	189	else
	190	saddr = find_first_bit(pnd->addrs, 64) << 2;
f8ff6028	191	} else
55748ac0	192	saddr = PN_NO_ADDR;
eeb74a9d	193	rcu_read_unlock();
55748ac0 RDC	194
	195	if (saddr == PN_NO_ADDR) {
	196	/* Fallback to another device */
	197	struct net_device *def_dev;
	198
	199	def_dev = phonet_device_get(dev_net(dev));
	200	if (def_dev) {
	201	if (def_dev != dev)
	202	saddr = phonet_address_get(def_dev, daddr);
	203	dev_put(def_dev);
	204	}
	205	}
	206	return saddr;
f8ff6028 RDC	207	}
f8ff6028 RDC	208
52404881	209	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	210	{
9a3b7a42	211	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	212	struct phonet_device *pnd;
9a3b7a42	213	int err = -EADDRNOTAVAIL;
f8ff6028	214
eeb74a9d RDC	215	rcu_read_lock();
eeb74a9d RDC	216	list_for_each_entry_rcu(pnd, &pndevs->list, list) {
f8ff6028 RDC	217	/* Don't allow unregistering devices! */
	218	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	219	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	220	continue;
	221
	222	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	223	err = 0;
9a3b7a42	224	goto found;
f8ff6028 RDC	225	}
f8ff6028 RDC	226	}
9a3b7a42	227	found:
eeb74a9d	228	rcu_read_unlock();
9a3b7a42	229	return err;
f8ff6028 RDC	230	}
f8ff6028 RDC	231
f5bb1c55 RDC	232	/* automatically configure a Phonet device, if supported */
	233	static int phonet_device_autoconf(struct net_device *dev)
	234	{
	235	struct if_phonet_req req;
	236	int ret;
	237
	238	if (!dev->netdev_ops->ndo_do_ioctl)
	239	return -EOPNOTSUPP;
	240
	241	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	242	SIOCPNGAUTOCONF);
	243	if (ret < 0)
	244	return ret;
b11b5165 RDC	245
	246	ASSERT_RTNL();
	247	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	248	if (ret)
	249	return ret;
	250	phonet_address_notify(RTM_NEWADDR, dev,
	251	req.ifr_phonet_autoconf.device);
	252	return 0;
f5bb1c55 RDC	253	}
f5bb1c55 RDC	254
f062f41d RDC	255	static void phonet_route_autodel(struct net_device *dev)
f062f41d RDC	256	{
0db3f0f4	257	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
95c96174	258	unsigned int i;
f062f41d RDC	259	DECLARE_BITMAP(deleted, 64);
	260
	261	/* Remove left-over Phonet routes */
	262	bitmap_zero(deleted, 64);
88880135	263	mutex_lock(&pnn->routes.lock);
f062f41d	264	for (i = 0; i < 64; i++)
79952bca	265	if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
a9b3cd7f	266	RCU_INIT_POINTER(pnn->routes.table[i], NULL);
f062f41d	267	set_bit(i, deleted);
f062f41d	268	}
88880135 RDC	269	mutex_unlock(&pnn->routes.lock);
	270
	271	if (bitmap_empty(deleted, 64))
	272	return; /* short-circuit RCU */
	273	synchronize_rcu();
6a499b24	274	for_each_set_bit(i, deleted, 64) {
f062f41d	275	rtm_phonet_notify(RTM_DELROUTE, dev, i);
88880135 RDC	276	dev_put(dev);
88880135 RDC	277	}
f062f41d RDC	278	}
f062f41d RDC	279
f8ff6028 RDC	280	/* notify Phonet of device events */
f8ff6028 RDC	281	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
351638e7	282	void *ptr)
f8ff6028	283	{
351638e7	284	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
f8ff6028	285
f5bb1c55 RDC	286	switch (what) {
	287	case NETDEV_REGISTER:
	288	if (dev->type == ARPHRD_PHONET)
	289	phonet_device_autoconf(dev);
	290	break;
	291	case NETDEV_UNREGISTER:
2be6fa4c	292	phonet_device_destroy(dev);
f062f41d	293	phonet_route_autodel(dev);
f5bb1c55 RDC	294	break;
f5bb1c55 RDC	295	}
f8ff6028 RDC	296	return 0;
	297
	298	}
	299
	300	static struct notifier_block phonet_device_notifier = {
	301	.notifier_call = phonet_device_notify,
	302	.priority = 0,
	303	};
	304
9a3b7a42	305	/* Per-namespace Phonet devices handling */
2c8c1e72	306	static int __net_init phonet_init_net(struct net *net)
9a3b7a42	307	{
0db3f0f4	308	struct phonet_net *pnn = phonet_pernet(net);
9a3b7a42	309
c3506372 CH	310	if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops,
c3506372 CH	311	sizeof(struct seq_net_private)))
c1dc13e9	312	return -ENOMEM;
c1dc13e9	313
9a3b7a42	314	INIT_LIST_HEAD(&pnn->pndevs.list);
eeb74a9d	315	mutex_init(&pnn->pndevs.lock);
88880135	316	mutex_init(&pnn->routes.lock);
9a3b7a42	317	return 0;
	318	}
	319
2c8c1e72	320	static void __net_exit phonet_exit_net(struct net *net)
9a3b7a42	321	{
ae61e8cd VA	322	struct phonet_net *pnn = phonet_pernet(net);
ae61e8cd VA	323
ece31ffd	324	remove_proc_entry("phonet", net->proc_net);
ae61e8cd	325	WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
9a3b7a42	326	}
	327
	328	static struct pernet_operations phonet_net_ops = {
	329	.init = phonet_init_net,
	330	.exit = phonet_exit_net,
d2b3eb63 EB	331	.id = &phonet_net_id,
d2b3eb63 EB	332	.size = sizeof(struct phonet_net),
9a3b7a42	333	};
9a3b7a42	334
f8ff6028	335	/* Initialize Phonet devices list */
76e02cf6	336	int __init phonet_device_init(void)
f8ff6028	337	{
03478756	338	int err = register_pernet_subsys(&phonet_net_ops);
9a3b7a42	339	if (err)
9a3b7a42	340	return err;
660f706d	341
c3506372 CH	342	proc_create_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops,
c3506372 CH	343	sizeof(struct seq_net_private));
f8ff6028	344	register_netdevice_notifier(&phonet_device_notifier);
660f706d	345	err = phonet_netlink_register();
	346	if (err)
	347	phonet_device_exit();
	348	return err;
f8ff6028 RDC	349	}
	350
	351	void phonet_device_exit(void)
	352	{
f8ff6028	353	rtnl_unregister_all(PF_PHONET);
6530e0fe	354	unregister_netdevice_notifier(&phonet_device_notifier);
03478756	355	unregister_pernet_subsys(&phonet_net_ops);
ece31ffd	356	remove_proc_entry("pnresource", init_net.proc_net);
f8ff6028	357	}
55748ac0 RDC	358
	359	int phonet_route_add(struct net_device *dev, u8 daddr)
	360	{
0db3f0f4	361	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0 RDC	362	struct phonet_routes *routes = &pnn->routes;
	363	int err = -EEXIST;
	364
	365	daddr = daddr >> 2;
88880135	366	mutex_lock(&routes->lock);
55748ac0	367	if (routes->table[daddr] == NULL) {
cf778b00	368	rcu_assign_pointer(routes->table[daddr], dev);
55748ac0 RDC	369	dev_hold(dev);
	370	err = 0;
	371	}
88880135	372	mutex_unlock(&routes->lock);
55748ac0 RDC	373	return err;
	374	}
	375
	376	int phonet_route_del(struct net_device *dev, u8 daddr)
	377	{
0db3f0f4	378	struct phonet_net *pnn = phonet_pernet(dev_net(dev));
55748ac0	379	struct phonet_routes *routes = &pnn->routes;
55748ac0 RDC	380
55748ac0 RDC	381	daddr = daddr >> 2;
88880135	382	mutex_lock(&routes->lock);
79952bca	383	if (rcu_access_pointer(routes->table[daddr]) == dev)
a9b3cd7f	384	RCU_INIT_POINTER(routes->table[daddr], NULL);
88880135 RDC	385	else
	386	dev = NULL;
	387	mutex_unlock(&routes->lock);
	388
	389	if (!dev)
	390	return -ENOENT;
	391	synchronize_rcu();
	392	dev_put(dev);
	393	return 0;
55748ac0 RDC	394	}
55748ac0 RDC	395
e67f88dd	396	struct net_device phonet_route_get_rcu(struct net net, u8 daddr)
55748ac0	397	{
0db3f0f4	398	struct phonet_net *pnn = phonet_pernet(net);
55748ac0 RDC	399	struct phonet_routes *routes = &pnn->routes;
	400	struct net_device *dev;
	401
55748ac0	402	daddr >>= 2;
88880135	403	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	404	return dev;
	405	}
	406
	407	struct net_device phonet_route_output(struct net net, u8 daddr)
	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
88880135 RDC	413	daddr >>= 2;
	414	rcu_read_lock();
	415	dev = rcu_dereference(routes->table[daddr]);
55748ac0 RDC	416	if (dev)
55748ac0 RDC	417	dev_hold(dev);
88880135	418	rcu_read_unlock();
55748ac0 RDC	419
	420	if (!dev)
	421	dev = phonet_device_get(net); /* Default route */
	422	return dev;
	423	}