[net-next-2.6.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_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;

	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;

	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();
	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
2be6fa4c	72	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	73	{
2be6fa4c RDC	74	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	75	struct phonet_device *pnd;
	76
	77	ASSERT_RTNL();
	78
	79	spin_lock_bh(&pndevs->lock);
	80	pnd = __phonet_get(dev);
	81	if (pnd)
	82	list_del(&pnd->list);
	83	spin_unlock_bh(&pndevs->lock);
	84
	85	if (pnd) {
	86	u8 addr;
	87
	88	for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
	89	addr = find_next_bit(pnd->addrs, 64, 1+addr))
	90	phonet_address_notify(RTM_DELADDR, dev, addr);
	91	kfree(pnd);
	92	}
f8ff6028 RDC	93	}
	94
	95	struct net_device phonet_device_get(struct net net)
	96	{
9a3b7a42	97	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028 RDC	98	struct phonet_device *pnd;
	99	struct net_device *dev;
	100
9a3b7a42	101	spin_lock_bh(&pndevs->lock);
9a3b7a42	102	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	103	dev = pnd->netdev;
	104	BUG_ON(!dev);
	105
9a3b7a42	106	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	107	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	108	break;
	109	dev = NULL;
	110	}
	111	if (dev)
	112	dev_hold(dev);
9a3b7a42	113	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	114	return dev;
	115	}
	116
	117	int phonet_address_add(struct net_device *dev, u8 addr)
	118	{
9a3b7a42	119	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	120	struct phonet_device *pnd;
	121	int err = 0;
	122
9a3b7a42	123	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	124	/* Find or create Phonet-specific device data */
	125	pnd = __phonet_get(dev);
	126	if (pnd == NULL)
	127	pnd = __phonet_device_alloc(dev);
	128	if (unlikely(pnd == NULL))
	129	err = -ENOMEM;
	130	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	131	err = -EEXIST;
9a3b7a42	132	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	133	return err;
	134	}
	135
	136	int phonet_address_del(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;
	140	int err = 0;
	141
9a3b7a42	142	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	143	pnd = __phonet_get(dev);
	144	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs))
	145	err = -EADDRNOTAVAIL;
2be6fa4c RDC	146	else if (bitmap_empty(pnd->addrs, 64)) {
	147	list_del(&pnd->list);
	148	kfree(pnd);
	149	}
9a3b7a42	150	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	151	return err;
	152	}
	153
	154	/* Gets a source address toward a destination, through a interface. */
	155	u8 phonet_address_get(struct net_device *dev, u8 addr)
	156	{
9a3b7a42	157	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	158	struct phonet_device *pnd;
f8ff6028 RDC	159
9a3b7a42	160	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	161	pnd = __phonet_get(dev);
	162	if (pnd) {
	163	BUG_ON(bitmap_empty(pnd->addrs, 64));
	164
	165	/* Use same source address as destination, if possible */
	166	if (!test_bit(addr >> 2, pnd->addrs))
	167	addr = find_first_bit(pnd->addrs, 64) << 2;
	168	} else
	169	addr = PN_NO_ADDR;
9a3b7a42	170	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	171	return addr;
	172	}
	173
52404881	174	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	175	{
9a3b7a42	176	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	177	struct phonet_device *pnd;
9a3b7a42	178	int err = -EADDRNOTAVAIL;
f8ff6028	179
9a3b7a42	180	spin_lock_bh(&pndevs->lock);
9a3b7a42	181	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	182	/* Don't allow unregistering devices! */
	183	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	184	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	185	continue;
	186
	187	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	188	err = 0;
9a3b7a42	189	goto found;
f8ff6028 RDC	190	}
f8ff6028 RDC	191	}
9a3b7a42	192	found:
	193	spin_unlock_bh(&pndevs->lock);
	194	return err;
f8ff6028 RDC	195	}
	196
	197	/* notify Phonet of device events */
	198	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	199	void *arg)
	200	{
	201	struct net_device *dev = arg;
	202
2be6fa4c RDC	203	if (what == NETDEV_UNREGISTER)
2be6fa4c RDC	204	phonet_device_destroy(dev);
f8ff6028 RDC	205	return 0;
	206
	207	}
	208
	209	static struct notifier_block phonet_device_notifier = {
	210	.notifier_call = phonet_device_notify,
	211	.priority = 0,
	212	};
	213
9a3b7a42	214	/* Per-namespace Phonet devices handling */
	215	static int phonet_init_net(struct net *net)
	216	{
	217	struct phonet_net pnn = kmalloc(sizeof(pnn), GFP_KERNEL);
	218	if (!pnn)
	219	return -ENOMEM;
	220
	221	INIT_LIST_HEAD(&pnn->pndevs.list);
	222	spin_lock_init(&pnn->pndevs.lock);
	223	net_assign_generic(net, phonet_net_id, pnn);
	224	return 0;
	225	}
	226
	227	static void phonet_exit_net(struct net *net)
	228	{
	229	struct phonet_net *pnn = net_generic(net, phonet_net_id);
2be6fa4c	230	struct net_device *dev;
9a3b7a42	231
2be6fa4c RDC	232	rtnl_lock();
	233	for_each_netdev(net, dev)
	234	phonet_device_destroy(dev);
	235	rtnl_unlock();
9a3b7a42	236	kfree(pnn);
	237	}
	238
	239	static struct pernet_operations phonet_net_ops = {
	240	.init = phonet_init_net,
	241	.exit = phonet_exit_net,
	242	};
	243
f8ff6028	244	/* Initialize Phonet devices list */
76e02cf6	245	int __init phonet_device_init(void)
f8ff6028	246	{
9a3b7a42	247	int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
	248	if (err)
	249	return err;
660f706d	250
f8ff6028	251	register_netdevice_notifier(&phonet_device_notifier);
660f706d	252	err = phonet_netlink_register();
	253	if (err)
	254	phonet_device_exit();
	255	return err;
f8ff6028 RDC	256	}
	257
	258	void phonet_device_exit(void)
	259	{
f8ff6028	260	rtnl_unregister_all(PF_PHONET);
6530e0fe	261	unregister_netdevice_notifier(&phonet_device_notifier);
9a3b7a42	262	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
f8ff6028	263	}