net/ieee802154/6lowpan/core.c - vendor/opensource/backports - Git at Google

 /* Copyright 2011, Siemens AG
  * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
  */

 /* Based on patches from Jon Smirl <jonsmirl@gmail.com>
  * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.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.
  */

 /* Jon's code is based on 6lowpan implementation for Contiki which is:
  * Copyright (c) 2008, Swedish Institute of Computer Science.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the Institute nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/ieee802154.h>

 #include <net/ipv6.h>

 #include "6lowpan_i.h"

 LIST_HEAD(lowpan_devices);
 static int lowpan_open_count;

 static __le16 lowpan_get_pan_id(const struct net_device *dev)
 {
 	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;

 	return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
 }

 static __le16 lowpan_get_short_addr(const struct net_device *dev)
 {
 	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;

 	return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
 }

 static u8 lowpan_get_dsn(const struct net_device *dev)
 {
 	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;

 	return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
 }

 static struct header_ops lowpan_header_ops = {
 	.create	= lowpan_header_create,
 };

 static struct lock_class_key lowpan_tx_busylock;
 static struct lock_class_key lowpan_netdev_xmit_lock_key;

 static void lowpan_set_lockdep_class_one(struct net_device *dev,
 					 struct netdev_queue *txq,
 					 void *_unused)
 {
 	lockdep_set_class(&txq->_xmit_lock,
 			  &lowpan_netdev_xmit_lock_key);
 }

 static int lowpan_dev_init(struct net_device *dev)
 {
 	netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
 	dev->qdisc_tx_busylock = &lowpan_tx_busylock;
 	return 0;
 }

 static const struct net_device_ops lowpan_netdev_ops = {
 	.ndo_init		= lowpan_dev_init,
 	.ndo_start_xmit		= lowpan_xmit,
 };

 static struct ieee802154_mlme_ops lowpan_mlme = {
 	.get_pan_id = lowpan_get_pan_id,
 	.get_short_addr = lowpan_get_short_addr,
 	.get_dsn = lowpan_get_dsn,
 };

 static void lowpan_setup(struct net_device *dev)
 {
 	dev->addr_len		= IEEE802154_ADDR_LEN;
 	memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
 	dev->type		= ARPHRD_6LOWPAN;
 	/* Frame Control + Sequence Number + Address fields + Security Header */
 	dev->hard_header_len	= 2 + 1 + 20 + 14;
 	dev->needed_tailroom	= 2; /* FCS */
 	dev->mtu		= IPV6_MIN_MTU;
 	dev->tx_queue_len	= 0;
 	dev->flags		= IFF_BROADCAST | IFF_MULTICAST;
 	dev->watchdog_timeo	= 0;

 	dev->netdev_ops		= &lowpan_netdev_ops;
 	dev->header_ops		= &lowpan_header_ops;
 	dev->ml_priv		= &lowpan_mlme;
 	dev->destructor		= free_netdev;
 	dev->features		|= NETIF_F_NETNS_LOCAL;
 }

 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
 {
 	if (tb[IFLA_ADDRESS]) {
 		if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
 			return -EINVAL;
 	}
 	return 0;
 }

 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
 			  struct nlattr *tb[], struct nlattr *data[])
 {
 	struct net_device *real_dev;
 	struct lowpan_dev_record *entry;
 	int ret;

 	ASSERT_RTNL();

 	pr_debug("adding new link\n");

 	if (!tb[IFLA_LINK] ||
 	    !net_eq(dev_net(dev), &init_net))
 		return -EINVAL;
 	/* find and hold real wpan device */
 	real_dev = dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
 	if (!real_dev)
 		return -ENODEV;
 	if (real_dev->type != ARPHRD_IEEE802154) {
 		dev_put(real_dev);
 		return -EINVAL;
 	}

 	lowpan_dev_info(dev)->real_dev = real_dev;
 	mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);

 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry) {
 		dev_put(real_dev);
 		lowpan_dev_info(dev)->real_dev = NULL;
 		return -ENOMEM;
 	}

 	entry->ldev = dev;

 	/* Set the lowpan hardware address to the wpan hardware address. */
 	memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);

 	mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 	INIT_LIST_HEAD(&entry->list);
 	list_add_tail(&entry->list, &lowpan_devices);
 	mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);

 	ret = register_netdevice(dev);
 	if (ret >= 0) {
 		if (!lowpan_open_count)
 			lowpan_rx_init();
 		lowpan_open_count++;
 	}

 	return ret;
 }

 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
 {
 	struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
 	struct net_device *real_dev = lowpan_dev->real_dev;
 	struct lowpan_dev_record *entry, *tmp;

 	ASSERT_RTNL();

 	lowpan_open_count--;
 	if (!lowpan_open_count)
 		lowpan_rx_exit();

 	mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
 	list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 		if (entry->ldev == dev) {
 			list_del(&entry->list);
 			kfree(entry);
 		}
 	}
 	mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);

 	mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);

 	unregister_netdevice_queue(dev, head);

 	dev_put(real_dev);
 }

 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
 	.kind		= "lowpan",
 	.priv_size	= sizeof(struct lowpan_dev_info),
 	.setup		= lowpan_setup,
 	.newlink	= lowpan_newlink,
 	.dellink	= lowpan_dellink,
 	.validate	= lowpan_validate,
 };

 static inline int __init lowpan_netlink_init(void)
 {
 	return rtnl_link_register(&lowpan_link_ops);
 }

 static inline void lowpan_netlink_fini(void)
 {
 	rtnl_link_unregister(&lowpan_link_ops);
 }

 static int lowpan_device_event(struct notifier_block *unused,
 			       unsigned long event, void *ptr)
 {
 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 	LIST_HEAD(del_list);
 	struct lowpan_dev_record *entry, *tmp;

 	if (dev->type != ARPHRD_IEEE802154)
 		goto out;

 	if (event == NETDEV_UNREGISTER) {
 		list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
 			if (lowpan_dev_info(entry->ldev)->real_dev == dev)
 				lowpan_dellink(entry->ldev, &del_list);
 		}

 		unregister_netdevice_many(&del_list);
 	}

 out:
 	return NOTIFY_DONE;
 }

 static struct notifier_block lowpan_dev_notifier = {
 	.notifier_call = lowpan_device_event,
 };

 static int __init lowpan_init_module(void)
 {
 	int err = 0;

 	err = lowpan_net_frag_init();
 	if (err < 0)
 		goto out;

 	err = lowpan_netlink_init();
 	if (err < 0)
 		goto out_frag;

 	err = register_netdevice_notifier(&lowpan_dev_notifier);
 	if (err < 0)
 		goto out_pack;

 	return 0;

 out_pack:
 	lowpan_netlink_fini();
 out_frag:
 	lowpan_net_frag_exit();
 out:
 	return err;
 }

 static void __exit lowpan_cleanup_module(void)
 {
 	lowpan_netlink_fini();

 	lowpan_net_frag_exit();

 	unregister_netdevice_notifier(&lowpan_dev_notifier);
 }

 module_init(lowpan_init_module);
 module_exit(lowpan_cleanup_module);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_RTNL_LINK("lowpan");
	/* Copyright 2011, Siemens AG
	* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	*/

	/* Based on patches from Jon Smirl <jonsmirl@gmail.com>
	* Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.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.
	*/

	/* Jon's code is based on 6lowpan implementation for Contiki which is:
	* Copyright (c) 2008, Swedish Institute of Computer Science.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the Institute nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/ieee802154.h>

	#include <net/ipv6.h>

	#include "6lowpan_i.h"

	LIST_HEAD(lowpan_devices);
	static int lowpan_open_count;

	static __le16 lowpan_get_pan_id(const struct net_device *dev)
	{
	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;

	return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
	}

	static __le16 lowpan_get_short_addr(const struct net_device *dev)
	{
	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;

	return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
	}

	static u8 lowpan_get_dsn(const struct net_device *dev)
	{
	struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;

	return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
	}

	static struct header_ops lowpan_header_ops = {
	.create = lowpan_header_create,
	};

	static struct lock_class_key lowpan_tx_busylock;
	static struct lock_class_key lowpan_netdev_xmit_lock_key;

	static void lowpan_set_lockdep_class_one(struct net_device *dev,
	struct netdev_queue *txq,
	void *_unused)
	{
	lockdep_set_class(&txq->_xmit_lock,
	&lowpan_netdev_xmit_lock_key);
	}

	static int lowpan_dev_init(struct net_device *dev)
	{
	netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
	dev->qdisc_tx_busylock = &lowpan_tx_busylock;
	return 0;
	}

	static const struct net_device_ops lowpan_netdev_ops = {
	.ndo_init = lowpan_dev_init,
	.ndo_start_xmit = lowpan_xmit,
	};

	static struct ieee802154_mlme_ops lowpan_mlme = {
	.get_pan_id = lowpan_get_pan_id,
	.get_short_addr = lowpan_get_short_addr,
	.get_dsn = lowpan_get_dsn,
	};

	static void lowpan_setup(struct net_device *dev)
	{
	dev->addr_len = IEEE802154_ADDR_LEN;
	memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
	dev->type = ARPHRD_6LOWPAN;
	/* Frame Control + Sequence Number + Address fields + Security Header */
	dev->hard_header_len = 2 + 1 + 20 + 14;
	dev->needed_tailroom = 2; /* FCS */
	dev->mtu = IPV6_MIN_MTU;
	dev->tx_queue_len = 0;
	dev->flags = IFF_BROADCAST \| IFF_MULTICAST;
	dev->watchdog_timeo = 0;

	dev->netdev_ops = &lowpan_netdev_ops;
	dev->header_ops = &lowpan_header_ops;
	dev->ml_priv = &lowpan_mlme;
	dev->destructor = free_netdev;
	dev->features \|= NETIF_F_NETNS_LOCAL;
	}

	static int lowpan_validate(struct nlattr tb[], struct nlattr data[])
	{
	if (tb[IFLA_ADDRESS]) {
	if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
	return -EINVAL;
	}
	return 0;
	}

	static int lowpan_newlink(struct net src_net, struct net_device dev,
	struct nlattr tb[], struct nlattr data[])
	{
	struct net_device *real_dev;
	struct lowpan_dev_record *entry;
	int ret;

	ASSERT_RTNL();

	pr_debug("adding new link\n");

	if (!tb[IFLA_LINK] \|\|
	!net_eq(dev_net(dev), &init_net))
	return -EINVAL;
	/* find and hold real wpan device */
	real_dev = dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
	if (!real_dev)
	return -ENODEV;
	if (real_dev->type != ARPHRD_IEEE802154) {
	dev_put(real_dev);
	return -EINVAL;
	}

	lowpan_dev_info(dev)->real_dev = real_dev;
	mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);

	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
	if (!entry) {
	dev_put(real_dev);
	lowpan_dev_info(dev)->real_dev = NULL;
	return -ENOMEM;
	}

	entry->ldev = dev;

	/* Set the lowpan hardware address to the wpan hardware address. */
	memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);

	mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
	INIT_LIST_HEAD(&entry->list);
	list_add_tail(&entry->list, &lowpan_devices);
	mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);

	ret = register_netdevice(dev);
	if (ret >= 0) {
	if (!lowpan_open_count)
	lowpan_rx_init();
	lowpan_open_count++;
	}

	return ret;
	}

	static void lowpan_dellink(struct net_device dev, struct list_head head)
	{
	struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
	struct net_device *real_dev = lowpan_dev->real_dev;
	struct lowpan_dev_record entry, tmp;

	ASSERT_RTNL();

	lowpan_open_count--;
	if (!lowpan_open_count)
	lowpan_rx_exit();

	mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
	list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
	if (entry->ldev == dev) {
	list_del(&entry->list);
	kfree(entry);
	}
	}
	mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);

	mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);

	unregister_netdevice_queue(dev, head);

	dev_put(real_dev);
	}

	static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
	.kind = "lowpan",
	.priv_size = sizeof(struct lowpan_dev_info),
	.setup = lowpan_setup,
	.newlink = lowpan_newlink,
	.dellink = lowpan_dellink,
	.validate = lowpan_validate,
	};

	static inline int __init lowpan_netlink_init(void)
	{
	return rtnl_link_register(&lowpan_link_ops);
	}

	static inline void lowpan_netlink_fini(void)
	{
	rtnl_link_unregister(&lowpan_link_ops);
	}

	static int lowpan_device_event(struct notifier_block *unused,
	unsigned long event, void *ptr)
	{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	LIST_HEAD(del_list);
	struct lowpan_dev_record entry, tmp;

	if (dev->type != ARPHRD_IEEE802154)
	goto out;

	if (event == NETDEV_UNREGISTER) {
	list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
	if (lowpan_dev_info(entry->ldev)->real_dev == dev)
	lowpan_dellink(entry->ldev, &del_list);
	}

	unregister_netdevice_many(&del_list);
	}

	out:
	return NOTIFY_DONE;
	}

	static struct notifier_block lowpan_dev_notifier = {
	.notifier_call = lowpan_device_event,
	};

	static int __init lowpan_init_module(void)
	{
	int err = 0;

	err = lowpan_net_frag_init();
	if (err < 0)
	goto out;

	err = lowpan_netlink_init();
	if (err < 0)
	goto out_frag;

	err = register_netdevice_notifier(&lowpan_dev_notifier);
	if (err < 0)
	goto out_pack;

	return 0;

	out_pack:
	lowpan_netlink_fini();
	out_frag:
	lowpan_net_frag_exit();
	out:
	return err;
	}

	static void __exit lowpan_cleanup_module(void)
	{
	lowpan_netlink_fini();

	lowpan_net_frag_exit();

	unregister_netdevice_notifier(&lowpan_dev_notifier);
	}

	module_init(lowpan_init_module);
	module_exit(lowpan_cleanup_module);
	MODULE_LICENSE("GPL");
	MODULE_ALIAS_RTNL_LINK("lowpan");