[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / phonet / pn_dev.c

/*
 * File: pn_dev.c
 *
 * Phonet network device
 *
 * Copyright (C) 2008 Nokia Corporation.
 *
 * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
 * Original author: Sakari Ailus <sakari.ailus@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/kernel.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/phonet.h>
#include <linux/proc_fs.h>
#include <net/sock.h>
#include <net/netns/generic.h>
#include <net/phonet/pn_dev.h>

struct phonet_net {
	struct phonet_device_list pndevs;
};

int phonet_net_id;

struct phonet_device_list *phonet_device_list(struct net *net)
{
	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	return &pnn->pndevs;
}

/* Allocate new Phonet device. */
static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
	if (pnd == NULL)
		return NULL;
	pnd->netdev = dev;
	bitmap_zero(pnd->addrs, 64);

	list_add(&pnd->list, &pndevs->list);
	return pnd;
}

static struct phonet_device *__phonet_get(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;

	list_for_each_entry(pnd, &pndevs->list, list) {
		if (pnd->netdev == dev)
			return pnd;
	}
	return NULL;
}

static void phonet_device_destroy(struct net_device *dev)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;

	ASSERT_RTNL();

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

	if (pnd) {
		u8 addr;

		for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
			addr = find_next_bit(pnd->addrs, 64, 1+addr))
			phonet_address_notify(RTM_DELADDR, dev, addr);
		kfree(pnd);
	}
}

struct net_device *phonet_device_get(struct net *net)
{
	struct phonet_device_list *pndevs = phonet_device_list(net);
	struct phonet_device *pnd;
	struct net_device *dev = NULL;

	spin_lock_bh(&pndevs->lock);
	list_for_each_entry(pnd, &pndevs->list, list) {
		dev = pnd->netdev;
		BUG_ON(!dev);

		if ((dev->reg_state == NETREG_REGISTERED) &&
			((pnd->netdev->flags & IFF_UP)) == IFF_UP)
			break;
		dev = NULL;
	}
	if (dev)
		dev_hold(dev);
	spin_unlock_bh(&pndevs->lock);
	return dev;
}

int phonet_address_add(struct net_device *dev, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;
	int err = 0;

	spin_lock_bh(&pndevs->lock);
	/* Find or create Phonet-specific device data */
	pnd = __phonet_get(dev);
	if (pnd == NULL)
		pnd = __phonet_device_alloc(dev);
	if (unlikely(pnd == NULL))
		err = -ENOMEM;
	else if (test_and_set_bit(addr >> 2, pnd->addrs))
		err = -EEXIST;
	spin_unlock_bh(&pndevs->lock);
	return err;
}

int phonet_address_del(struct net_device *dev, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;
	int err = 0;

	spin_lock_bh(&pndevs->lock);
	pnd = __phonet_get(dev);
	if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
		err = -EADDRNOTAVAIL;
	else if (bitmap_empty(pnd->addrs, 64)) {
		list_del(&pnd->list);
		kfree(pnd);
	}
	spin_unlock_bh(&pndevs->lock);
	return err;
}

/* Gets a source address toward a destination, through a interface. */
u8 phonet_address_get(struct net_device *dev, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	struct phonet_device *pnd;

	spin_lock_bh(&pndevs->lock);
	pnd = __phonet_get(dev);
	if (pnd) {
		BUG_ON(bitmap_empty(pnd->addrs, 64));

		/* Use same source address as destination, if possible */
		if (!test_bit(addr >> 2, pnd->addrs))
			addr = find_first_bit(pnd->addrs, 64) << 2;
	} else
		addr = PN_NO_ADDR;
	spin_unlock_bh(&pndevs->lock);
	return addr;
}

int phonet_address_lookup(struct net *net, u8 addr)
{
	struct phonet_device_list *pndevs = phonet_device_list(net);
	struct phonet_device *pnd;
	int err = -EADDRNOTAVAIL;

	spin_lock_bh(&pndevs->lock);
	list_for_each_entry(pnd, &pndevs->list, list) {
		/* Don't allow unregistering devices! */
		if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
				((pnd->netdev->flags & IFF_UP)) != IFF_UP)
			continue;

		if (test_bit(addr >> 2, pnd->addrs)) {
			err = 0;
			goto found;
		}
	}
found:
	spin_unlock_bh(&pndevs->lock);
	return err;
}

/* notify Phonet of device events */
static int phonet_device_notify(struct notifier_block *me, unsigned long what,
				void *arg)
{
	struct net_device *dev = arg;

	if (what == NETDEV_UNREGISTER)
		phonet_device_destroy(dev);
	return 0;

}

static struct notifier_block phonet_device_notifier = {
	.notifier_call = phonet_device_notify,
	.priority = 0,
};

/* Per-namespace Phonet devices handling */
static int phonet_init_net(struct net *net)
{
	struct phonet_net *pnn = kmalloc(sizeof(*pnn), GFP_KERNEL);
	if (!pnn)
		return -ENOMEM;

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

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

static void phonet_exit_net(struct net *net)
{
	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	struct net_device *dev;

	rtnl_lock();
	for_each_netdev(net, dev)
		phonet_device_destroy(dev);
	rtnl_unlock();

	proc_net_remove(net, "phonet");
	kfree(pnn);
}

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

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

	register_netdevice_notifier(&phonet_device_notifier);
	err = phonet_netlink_register();
	if (err)
		phonet_device_exit();
	return err;
}

void phonet_device_exit(void)
{
	rtnl_unregister_all(PF_PHONET);
	unregister_netdevice_notifier(&phonet_device_notifier);
	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
}
Commit	Line	Data
f8ff6028 RDC	1	/*
	2	* File: pn_dev.c
	3	*
	4	* Phonet network device
	5	*
	6	* Copyright (C) 2008 Nokia Corporation.
	7	*
	8	* Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
	9	* Original author: Sakari Ailus <sakari.ailus@nokia.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* version 2 as published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	23	* 02110-1301 USA
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/net.h>
	28	#include <linux/netdevice.h>
	29	#include <linux/phonet.h>
421d20a3	30	#include <linux/proc_fs.h>
f8ff6028	31	#include <net/sock.h>
9a3b7a42	32	#include <net/netns/generic.h>
f8ff6028 RDC	33	#include <net/phonet/pn_dev.h>
f8ff6028 RDC	34
9a3b7a42	35	struct phonet_net {
9a3b7a42	36	struct phonet_device_list pndevs;
f8ff6028 RDC	37	};
f8ff6028 RDC	38
9a3b7a42	39	int phonet_net_id;
	40
	41	struct phonet_device_list phonet_device_list(struct net net)
	42	{
	43	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	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
9a3b7a42	57	list_add(&pnd->list, &pndevs->list);
f8ff6028 RDC	58	return pnd;
	59	}
	60
	61	static struct phonet_device __phonet_get(struct net_device dev)
	62	{
9a3b7a42	63	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	64	struct phonet_device *pnd;
f8ff6028 RDC	65
9a3b7a42	66	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	67	if (pnd->netdev == dev)
	68	return pnd;
	69	}
	70	return NULL;
	71	}
	72
2be6fa4c	73	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	74	{
2be6fa4c RDC	75	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	76	struct phonet_device *pnd;
	77
	78	ASSERT_RTNL();
	79
	80	spin_lock_bh(&pndevs->lock);
	81	pnd = __phonet_get(dev);
	82	if (pnd)
	83	list_del(&pnd->list);
	84	spin_unlock_bh(&pndevs->lock);
	85
	86	if (pnd) {
	87	u8 addr;
	88
	89	for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
	90	addr = find_next_bit(pnd->addrs, 64, 1+addr))
	91	phonet_address_notify(RTM_DELADDR, dev, addr);
	92	kfree(pnd);
	93	}
f8ff6028 RDC	94	}
	95
	96	struct net_device phonet_device_get(struct net net)
	97	{
9a3b7a42	98	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	99	struct phonet_device *pnd;
59e57f44	100	struct net_device *dev = NULL;
f8ff6028	101
9a3b7a42	102	spin_lock_bh(&pndevs->lock);
9a3b7a42	103	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	104	dev = pnd->netdev;
	105	BUG_ON(!dev);
	106
9a3b7a42	107	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	108	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	109	break;
	110	dev = NULL;
	111	}
	112	if (dev)
	113	dev_hold(dev);
9a3b7a42	114	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	115	return dev;
	116	}
	117
	118	int phonet_address_add(struct net_device *dev, u8 addr)
	119	{
9a3b7a42	120	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	121	struct phonet_device *pnd;
	122	int err = 0;
	123
9a3b7a42	124	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	125	/* Find or create Phonet-specific device data */
	126	pnd = __phonet_get(dev);
	127	if (pnd == NULL)
	128	pnd = __phonet_device_alloc(dev);
	129	if (unlikely(pnd == NULL))
	130	err = -ENOMEM;
	131	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	132	err = -EEXIST;
9a3b7a42	133	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	134	return err;
	135	}
	136
	137	int phonet_address_del(struct net_device *dev, u8 addr)
	138	{
9a3b7a42	139	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	140	struct phonet_device *pnd;
	141	int err = 0;
	142
9a3b7a42	143	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	144	pnd = __phonet_get(dev);
	145	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs))
	146	err = -EADDRNOTAVAIL;
2be6fa4c RDC	147	else if (bitmap_empty(pnd->addrs, 64)) {
	148	list_del(&pnd->list);
	149	kfree(pnd);
	150	}
9a3b7a42	151	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	152	return err;
	153	}
	154
	155	/* Gets a source address toward a destination, through a interface. */
	156	u8 phonet_address_get(struct net_device *dev, u8 addr)
	157	{
9a3b7a42	158	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	159	struct phonet_device *pnd;
f8ff6028 RDC	160
9a3b7a42	161	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	162	pnd = __phonet_get(dev);
	163	if (pnd) {
	164	BUG_ON(bitmap_empty(pnd->addrs, 64));
	165
	166	/* Use same source address as destination, if possible */
	167	if (!test_bit(addr >> 2, pnd->addrs))
	168	addr = find_first_bit(pnd->addrs, 64) << 2;
	169	} else
	170	addr = PN_NO_ADDR;
9a3b7a42	171	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	172	return addr;
	173	}
	174
52404881	175	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	176	{
9a3b7a42	177	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	178	struct phonet_device *pnd;
9a3b7a42	179	int err = -EADDRNOTAVAIL;
f8ff6028	180
9a3b7a42	181	spin_lock_bh(&pndevs->lock);
9a3b7a42	182	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	183	/* Don't allow unregistering devices! */
	184	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	185	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	186	continue;
	187
	188	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	189	err = 0;
9a3b7a42	190	goto found;
f8ff6028 RDC	191	}
f8ff6028 RDC	192	}
9a3b7a42	193	found:
	194	spin_unlock_bh(&pndevs->lock);
	195	return err;
f8ff6028 RDC	196	}
	197
	198	/* notify Phonet of device events */
	199	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	200	void *arg)
	201	{
	202	struct net_device *dev = arg;
	203
2be6fa4c RDC	204	if (what == NETDEV_UNREGISTER)
2be6fa4c RDC	205	phonet_device_destroy(dev);
f8ff6028 RDC	206	return 0;
	207
	208	}
	209
	210	static struct notifier_block phonet_device_notifier = {
	211	.notifier_call = phonet_device_notify,
	212	.priority = 0,
	213	};
	214
9a3b7a42	215	/* Per-namespace Phonet devices handling */
	216	static int phonet_init_net(struct net *net)
	217	{
	218	struct phonet_net pnn = kmalloc(sizeof(pnn), GFP_KERNEL);
	219	if (!pnn)
	220	return -ENOMEM;
	221
c1dc13e9 RDC	222	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) {
	223	kfree(pnn);
	224	return -ENOMEM;
	225	}
	226
9a3b7a42	227	INIT_LIST_HEAD(&pnn->pndevs.list);
	228	spin_lock_init(&pnn->pndevs.lock);
	229	net_assign_generic(net, phonet_net_id, pnn);
	230	return 0;
	231	}
	232
	233	static void phonet_exit_net(struct net *net)
	234	{
	235	struct phonet_net *pnn = net_generic(net, phonet_net_id);
2be6fa4c	236	struct net_device *dev;
9a3b7a42	237
2be6fa4c RDC	238	rtnl_lock();
	239	for_each_netdev(net, dev)
	240	phonet_device_destroy(dev);
	241	rtnl_unlock();
c1dc13e9 RDC	242
c1dc13e9 RDC	243	proc_net_remove(net, "phonet");
9a3b7a42	244	kfree(pnn);
	245	}
	246
	247	static struct pernet_operations phonet_net_ops = {
	248	.init = phonet_init_net,
	249	.exit = phonet_exit_net,
	250	};
	251
f8ff6028	252	/* Initialize Phonet devices list */
76e02cf6	253	int __init phonet_device_init(void)
f8ff6028	254	{
9a3b7a42	255	int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
	256	if (err)
	257	return err;
660f706d	258
f8ff6028	259	register_netdevice_notifier(&phonet_device_notifier);
660f706d	260	err = phonet_netlink_register();
	261	if (err)
	262	phonet_device_exit();
	263	return err;
f8ff6028 RDC	264	}
	265
	266	void phonet_device_exit(void)
	267	{
f8ff6028	268	rtnl_unregister_all(PF_PHONET);
6530e0fe	269	unregister_netdevice_notifier(&phonet_device_notifier);
9a3b7a42	270	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
f8ff6028	271	}