[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 <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_free(struct phonet_device *pnd)
{
	list_del(&pnd->list);
	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;

	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))
		__phonet_device_free(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) {
		struct phonet_device_list *pndevs;
		struct phonet_device *pnd;

		/* Destroy phonet-specific device data */
		pndevs = phonet_device_list(dev_net(dev));
		spin_lock_bh(&pndevs->lock);
		pnd = __phonet_get(dev);
		if (pnd)
			__phonet_device_free(pnd);
		spin_unlock_bh(&pndevs->lock);
	}
	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;

	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 phonet_device *pnd, *n;

	list_for_each_entry_safe(pnd, n, &pnn->pndevs.list, list)
		__phonet_device_free(pnd);

	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>
	30	#include <net/sock.h>
9a3b7a42	31	#include <net/netns/generic.h>
f8ff6028 RDC	32	#include <net/phonet/pn_dev.h>
f8ff6028 RDC	33
9a3b7a42	34	struct phonet_net {
9a3b7a42	35	struct phonet_device_list pndevs;
f8ff6028 RDC	36	};
f8ff6028 RDC	37
9a3b7a42	38	int phonet_net_id;
	39
	40	struct phonet_device_list phonet_device_list(struct net net)
	41	{
	42	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	43	return &pnn->pndevs;
	44	}
	45
f8ff6028 RDC	46	/* Allocate new Phonet device. */
	47	static struct phonet_device __phonet_device_alloc(struct net_device dev)
	48	{
9a3b7a42	49	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	50	struct phonet_device pnd = kmalloc(sizeof(pnd), GFP_ATOMIC);
	51	if (pnd == NULL)
	52	return NULL;
	53	pnd->netdev = dev;
	54	bitmap_zero(pnd->addrs, 64);
	55
9a3b7a42	56	list_add(&pnd->list, &pndevs->list);
f8ff6028 RDC	57	return pnd;
	58	}
	59
	60	static struct phonet_device __phonet_get(struct net_device dev)
	61	{
9a3b7a42	62	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	63	struct phonet_device *pnd;
f8ff6028 RDC	64
9a3b7a42	65	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	66	if (pnd->netdev == dev)
	67	return pnd;
	68	}
	69	return NULL;
	70	}
	71
	72	static void __phonet_device_free(struct phonet_device *pnd)
	73	{
	74	list_del(&pnd->list);
	75	kfree(pnd);
	76	}
	77
	78	struct net_device phonet_device_get(struct net net)
	79	{
9a3b7a42	80	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028 RDC	81	struct phonet_device *pnd;
	82	struct net_device *dev;
	83
9a3b7a42	84	spin_lock_bh(&pndevs->lock);
9a3b7a42	85	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	86	dev = pnd->netdev;
	87	BUG_ON(!dev);
	88
9a3b7a42	89	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	90	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	91	break;
	92	dev = NULL;
	93	}
	94	if (dev)
	95	dev_hold(dev);
9a3b7a42	96	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	97	return dev;
	98	}
	99
	100	int phonet_address_add(struct net_device *dev, u8 addr)
	101	{
9a3b7a42	102	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	103	struct phonet_device *pnd;
	104	int err = 0;
	105
9a3b7a42	106	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	107	/* Find or create Phonet-specific device data */
	108	pnd = __phonet_get(dev);
	109	if (pnd == NULL)
	110	pnd = __phonet_device_alloc(dev);
	111	if (unlikely(pnd == NULL))
	112	err = -ENOMEM;
	113	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	114	err = -EEXIST;
9a3b7a42	115	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	116	return err;
	117	}
	118
	119	int phonet_address_del(struct net_device *dev, u8 addr)
	120	{
9a3b7a42	121	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	122	struct phonet_device *pnd;
	123	int err = 0;
	124
9a3b7a42	125	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	126	pnd = __phonet_get(dev);
	127	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs))
	128	err = -EADDRNOTAVAIL;
7e5ab542	129	else if (bitmap_empty(pnd->addrs, 64))
f8ff6028	130	__phonet_device_free(pnd);
9a3b7a42	131	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	132	return err;
	133	}
	134
	135	/* Gets a source address toward a destination, through a interface. */
	136	u8 phonet_address_get(struct net_device *dev, u8 addr)
	137	{
9a3b7a42	138	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	139	struct phonet_device *pnd;
f8ff6028 RDC	140
9a3b7a42	141	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	142	pnd = __phonet_get(dev);
	143	if (pnd) {
	144	BUG_ON(bitmap_empty(pnd->addrs, 64));
	145
	146	/* Use same source address as destination, if possible */
	147	if (!test_bit(addr >> 2, pnd->addrs))
	148	addr = find_first_bit(pnd->addrs, 64) << 2;
	149	} else
	150	addr = PN_NO_ADDR;
9a3b7a42	151	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	152	return addr;
	153	}
	154
52404881	155	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	156	{
9a3b7a42	157	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	158	struct phonet_device *pnd;
9a3b7a42	159	int err = -EADDRNOTAVAIL;
f8ff6028	160
9a3b7a42	161	spin_lock_bh(&pndevs->lock);
9a3b7a42	162	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	163	/* Don't allow unregistering devices! */
	164	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	165	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	166	continue;
	167
	168	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	169	err = 0;
9a3b7a42	170	goto found;
f8ff6028 RDC	171	}
f8ff6028 RDC	172	}
9a3b7a42	173	found:
	174	spin_unlock_bh(&pndevs->lock);
	175	return err;
f8ff6028 RDC	176	}
	177
	178	/* notify Phonet of device events */
	179	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	180	void *arg)
	181	{
	182	struct net_device *dev = arg;
	183
	184	if (what == NETDEV_UNREGISTER) {
9a3b7a42	185	struct phonet_device_list *pndevs;
f8ff6028 RDC	186	struct phonet_device *pnd;
	187
	188	/* Destroy phonet-specific device data */
9a3b7a42	189	pndevs = phonet_device_list(dev_net(dev));
9a3b7a42	190	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	191	pnd = __phonet_get(dev);
	192	if (pnd)
	193	__phonet_device_free(pnd);
9a3b7a42	194	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	195	}
	196	return 0;
	197
	198	}
	199
	200	static struct notifier_block phonet_device_notifier = {
	201	.notifier_call = phonet_device_notify,
	202	.priority = 0,
	203	};
	204
9a3b7a42	205	/* Per-namespace Phonet devices handling */
	206	static int phonet_init_net(struct net *net)
	207	{
	208	struct phonet_net pnn = kmalloc(sizeof(pnn), GFP_KERNEL);
	209	if (!pnn)
	210	return -ENOMEM;
	211
	212	INIT_LIST_HEAD(&pnn->pndevs.list);
	213	spin_lock_init(&pnn->pndevs.lock);
	214	net_assign_generic(net, phonet_net_id, pnn);
	215	return 0;
	216	}
	217
	218	static void phonet_exit_net(struct net *net)
	219	{
	220	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	221	struct phonet_device pnd, n;
	222
	223	list_for_each_entry_safe(pnd, n, &pnn->pndevs.list, list)
	224	__phonet_device_free(pnd);
	225
	226	kfree(pnn);
	227	}
	228
	229	static struct pernet_operations phonet_net_ops = {
	230	.init = phonet_init_net,
	231	.exit = phonet_exit_net,
	232	};
	233
f8ff6028	234	/* Initialize Phonet devices list */
76e02cf6	235	int __init phonet_device_init(void)
f8ff6028	236	{
9a3b7a42	237	int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
	238	if (err)
	239	return err;
660f706d	240
f8ff6028	241	register_netdevice_notifier(&phonet_device_notifier);
660f706d	242	err = phonet_netlink_register();
	243	if (err)
	244	phonet_device_exit();
	245	return err;
f8ff6028 RDC	246	}
	247
	248	void phonet_device_exit(void)
	249	{
f8ff6028	250	rtnl_unregister_all(PF_PHONET);
6530e0fe	251	unregister_netdevice_notifier(&phonet_device_notifier);
9a3b7a42	252	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
f8ff6028	253	}