[linux-2.6-block.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 <linux/if_arp.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;
}

/* 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;
}

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

	switch (what) {
	case NETDEV_REGISTER:
		if (dev->type == ARPHRD_PHONET)
			phonet_device_autoconf(dev);
		break;
	case NETDEV_UNREGISTER:
		phonet_device_destroy(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 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>
f5bb1c55	31	#include <linux/if_arp.h>
f8ff6028	32	#include <net/sock.h>
9a3b7a42	33	#include <net/netns/generic.h>
f8ff6028 RDC	34	#include <net/phonet/pn_dev.h>
f8ff6028 RDC	35
9a3b7a42	36	struct phonet_net {
9a3b7a42	37	struct phonet_device_list pndevs;
f8ff6028 RDC	38	};
f8ff6028 RDC	39
9a3b7a42	40	int phonet_net_id;
	41
	42	struct phonet_device_list phonet_device_list(struct net net)
	43	{
	44	struct phonet_net *pnn = net_generic(net, phonet_net_id);
	45	return &pnn->pndevs;
	46	}
	47
f8ff6028 RDC	48	/* Allocate new Phonet device. */
	49	static struct phonet_device __phonet_device_alloc(struct net_device dev)
	50	{
9a3b7a42	51	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	52	struct phonet_device pnd = kmalloc(sizeof(pnd), GFP_ATOMIC);
	53	if (pnd == NULL)
	54	return NULL;
	55	pnd->netdev = dev;
	56	bitmap_zero(pnd->addrs, 64);
	57
9a3b7a42	58	list_add(&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
9a3b7a42	67	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	68	if (pnd->netdev == dev)
	69	return pnd;
	70	}
	71	return NULL;
	72	}
	73
2be6fa4c	74	static void phonet_device_destroy(struct net_device *dev)
f8ff6028	75	{
2be6fa4c RDC	76	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
	77	struct phonet_device *pnd;
	78
	79	ASSERT_RTNL();
	80
	81	spin_lock_bh(&pndevs->lock);
	82	pnd = __phonet_get(dev);
	83	if (pnd)
	84	list_del(&pnd->list);
	85	spin_unlock_bh(&pndevs->lock);
	86
	87	if (pnd) {
	88	u8 addr;
	89
	90	for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
	91	addr = find_next_bit(pnd->addrs, 64, 1+addr))
	92	phonet_address_notify(RTM_DELADDR, dev, addr);
	93	kfree(pnd);
	94	}
f8ff6028 RDC	95	}
	96
	97	struct net_device phonet_device_get(struct net net)
	98	{
9a3b7a42	99	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	100	struct phonet_device *pnd;
59e57f44	101	struct net_device *dev = NULL;
f8ff6028	102
9a3b7a42	103	spin_lock_bh(&pndevs->lock);
9a3b7a42	104	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	105	dev = pnd->netdev;
	106	BUG_ON(!dev);
	107
9a3b7a42	108	if ((dev->reg_state == NETREG_REGISTERED) &&
f8ff6028 RDC	109	((pnd->netdev->flags & IFF_UP)) == IFF_UP)
	110	break;
	111	dev = NULL;
	112	}
	113	if (dev)
	114	dev_hold(dev);
9a3b7a42	115	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	116	return dev;
	117	}
	118
	119	int phonet_address_add(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	/* Find or create Phonet-specific device data */
	127	pnd = __phonet_get(dev);
	128	if (pnd == NULL)
	129	pnd = __phonet_device_alloc(dev);
	130	if (unlikely(pnd == NULL))
	131	err = -ENOMEM;
	132	else if (test_and_set_bit(addr >> 2, pnd->addrs))
	133	err = -EEXIST;
9a3b7a42	134	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	135	return err;
	136	}
	137
	138	int phonet_address_del(struct net_device *dev, u8 addr)
	139	{
9a3b7a42	140	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	141	struct phonet_device *pnd;
	142	int err = 0;
	143
9a3b7a42	144	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	145	pnd = __phonet_get(dev);
	146	if (!pnd \|\| !test_and_clear_bit(addr >> 2, pnd->addrs))
	147	err = -EADDRNOTAVAIL;
2be6fa4c RDC	148	else if (bitmap_empty(pnd->addrs, 64)) {
	149	list_del(&pnd->list);
	150	kfree(pnd);
	151	}
9a3b7a42	152	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	153	return err;
	154	}
	155
	156	/* Gets a source address toward a destination, through a interface. */
	157	u8 phonet_address_get(struct net_device *dev, u8 addr)
	158	{
9a3b7a42	159	struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
f8ff6028 RDC	160	struct phonet_device *pnd;
f8ff6028 RDC	161
9a3b7a42	162	spin_lock_bh(&pndevs->lock);
f8ff6028 RDC	163	pnd = __phonet_get(dev);
	164	if (pnd) {
	165	BUG_ON(bitmap_empty(pnd->addrs, 64));
	166
	167	/* Use same source address as destination, if possible */
	168	if (!test_bit(addr >> 2, pnd->addrs))
	169	addr = find_first_bit(pnd->addrs, 64) << 2;
	170	} else
	171	addr = PN_NO_ADDR;
9a3b7a42	172	spin_unlock_bh(&pndevs->lock);
f8ff6028 RDC	173	return addr;
	174	}
	175
52404881	176	int phonet_address_lookup(struct net *net, u8 addr)
f8ff6028	177	{
9a3b7a42	178	struct phonet_device_list *pndevs = phonet_device_list(net);
f8ff6028	179	struct phonet_device *pnd;
9a3b7a42	180	int err = -EADDRNOTAVAIL;
f8ff6028	181
9a3b7a42	182	spin_lock_bh(&pndevs->lock);
9a3b7a42	183	list_for_each_entry(pnd, &pndevs->list, list) {
f8ff6028 RDC	184	/* Don't allow unregistering devices! */
	185	if ((pnd->netdev->reg_state != NETREG_REGISTERED) \|\|
	186	((pnd->netdev->flags & IFF_UP)) != IFF_UP)
	187	continue;
	188
	189	if (test_bit(addr >> 2, pnd->addrs)) {
9a3b7a42	190	err = 0;
9a3b7a42	191	goto found;
f8ff6028 RDC	192	}
f8ff6028 RDC	193	}
9a3b7a42	194	found:
	195	spin_unlock_bh(&pndevs->lock);
	196	return err;
f8ff6028 RDC	197	}
f8ff6028 RDC	198
f5bb1c55 RDC	199	/* automatically configure a Phonet device, if supported */
	200	static int phonet_device_autoconf(struct net_device *dev)
	201	{
	202	struct if_phonet_req req;
	203	int ret;
	204
	205	if (!dev->netdev_ops->ndo_do_ioctl)
	206	return -EOPNOTSUPP;
	207
	208	ret = dev->netdev_ops->ndo_do_ioctl(dev, (struct ifreq *)&req,
	209	SIOCPNGAUTOCONF);
	210	if (ret < 0)
	211	return ret;
b11b5165 RDC	212
	213	ASSERT_RTNL();
	214	ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
	215	if (ret)
	216	return ret;
	217	phonet_address_notify(RTM_NEWADDR, dev,
	218	req.ifr_phonet_autoconf.device);
	219	return 0;
f5bb1c55 RDC	220	}
f5bb1c55 RDC	221
f8ff6028 RDC	222	/* notify Phonet of device events */
	223	static int phonet_device_notify(struct notifier_block *me, unsigned long what,
	224	void *arg)
	225	{
	226	struct net_device *dev = arg;
	227
f5bb1c55 RDC	228	switch (what) {
	229	case NETDEV_REGISTER:
	230	if (dev->type == ARPHRD_PHONET)
	231	phonet_device_autoconf(dev);
	232	break;
	233	case NETDEV_UNREGISTER:
2be6fa4c	234	phonet_device_destroy(dev);
f5bb1c55 RDC	235	break;
f5bb1c55 RDC	236	}
f8ff6028 RDC	237	return 0;
	238
	239	}
	240
	241	static struct notifier_block phonet_device_notifier = {
	242	.notifier_call = phonet_device_notify,
	243	.priority = 0,
	244	};
	245
9a3b7a42	246	/* Per-namespace Phonet devices handling */
	247	static int phonet_init_net(struct net *net)
	248	{
	249	struct phonet_net pnn = kmalloc(sizeof(pnn), GFP_KERNEL);
	250	if (!pnn)
	251	return -ENOMEM;
	252
c1dc13e9 RDC	253	if (!proc_net_fops_create(net, "phonet", 0, &pn_sock_seq_fops)) {
	254	kfree(pnn);
	255	return -ENOMEM;
	256	}
	257
9a3b7a42	258	INIT_LIST_HEAD(&pnn->pndevs.list);
	259	spin_lock_init(&pnn->pndevs.lock);
	260	net_assign_generic(net, phonet_net_id, pnn);
	261	return 0;
	262	}
	263
	264	static void phonet_exit_net(struct net *net)
	265	{
	266	struct phonet_net *pnn = net_generic(net, phonet_net_id);
2be6fa4c	267	struct net_device *dev;
9a3b7a42	268
2be6fa4c RDC	269	rtnl_lock();
	270	for_each_netdev(net, dev)
	271	phonet_device_destroy(dev);
	272	rtnl_unlock();
c1dc13e9 RDC	273
c1dc13e9 RDC	274	proc_net_remove(net, "phonet");
9a3b7a42	275	kfree(pnn);
	276	}
	277
	278	static struct pernet_operations phonet_net_ops = {
	279	.init = phonet_init_net,
	280	.exit = phonet_exit_net,
	281	};
	282
f8ff6028	283	/* Initialize Phonet devices list */
76e02cf6	284	int __init phonet_device_init(void)
f8ff6028	285	{
9a3b7a42	286	int err = register_pernet_gen_device(&phonet_net_id, &phonet_net_ops);
	287	if (err)
	288	return err;
660f706d	289
f8ff6028	290	register_netdevice_notifier(&phonet_device_notifier);
660f706d	291	err = phonet_netlink_register();
	292	if (err)
	293	phonet_device_exit();
	294	return err;
f8ff6028 RDC	295	}
	296
	297	void phonet_device_exit(void)
	298	{
f8ff6028	299	rtnl_unregister_all(PF_PHONET);
6530e0fe	300	unregister_netdevice_notifier(&phonet_device_notifier);
9a3b7a42	301	unregister_pernet_gen_device(phonet_net_id, &phonet_net_ops);
f8ff6028	302	}