1 /* Copyright 2011, Siemens AG
2 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
5 /* Based on patches from Jon Smirl <jonsmirl@gmail.com>
6 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 /* Jon's code is based on 6lowpan implementation for Contiki which is:
19 * Copyright (c) 2008, Swedish Institute of Computer Science.
20 * All rights reserved.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the above copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. Neither the name of the Institute nor the names of its contributors
31 * may be used to endorse or promote products derived from this software
32 * without specific prior written permission.
34 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 #include <linux/module.h>
48 #include <linux/netdevice.h>
49 #include <linux/ieee802154.h>
53 #include "6lowpan_i.h"
55 LIST_HEAD(lowpan_devices);
56 static int lowpan_open_count;
58 static __le16 lowpan_get_pan_id(const struct net_device *dev)
60 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
62 return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
65 static __le16 lowpan_get_short_addr(const struct net_device *dev)
67 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
69 return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
72 static u8 lowpan_get_dsn(const struct net_device *dev)
74 struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
76 return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
79 static struct header_ops lowpan_header_ops = {
80 .create = lowpan_header_create,
83 static struct lock_class_key lowpan_tx_busylock;
84 static struct lock_class_key lowpan_netdev_xmit_lock_key;
86 static void lowpan_set_lockdep_class_one(struct net_device *dev,
87 struct netdev_queue *txq,
90 lockdep_set_class(&txq->_xmit_lock,
91 &lowpan_netdev_xmit_lock_key);
94 static int lowpan_dev_init(struct net_device *dev)
96 netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
97 dev->qdisc_tx_busylock = &lowpan_tx_busylock;
101 static const struct net_device_ops lowpan_netdev_ops = {
102 .ndo_init = lowpan_dev_init,
103 .ndo_start_xmit = lowpan_xmit,
106 static struct ieee802154_mlme_ops lowpan_mlme = {
107 .get_pan_id = lowpan_get_pan_id,
108 .get_short_addr = lowpan_get_short_addr,
109 .get_dsn = lowpan_get_dsn,
112 static void lowpan_setup(struct net_device *dev)
114 dev->addr_len = IEEE802154_ADDR_LEN;
115 memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
116 dev->type = ARPHRD_6LOWPAN;
117 /* Frame Control + Sequence Number + Address fields + Security Header */
118 dev->hard_header_len = 2 + 1 + 20 + 14;
119 dev->needed_tailroom = 2; /* FCS */
120 dev->mtu = IPV6_MIN_MTU;
121 dev->tx_queue_len = 0;
122 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
123 dev->watchdog_timeo = 0;
125 dev->netdev_ops = &lowpan_netdev_ops;
126 dev->header_ops = &lowpan_header_ops;
127 dev->ml_priv = &lowpan_mlme;
128 dev->destructor = free_netdev;
129 dev->features |= NETIF_F_NETNS_LOCAL;
132 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
134 if (tb[IFLA_ADDRESS]) {
135 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
141 static int lowpan_newlink(struct net *src_net, struct net_device *dev,
142 struct nlattr *tb[], struct nlattr *data[])
144 struct net_device *real_dev;
145 struct lowpan_dev_record *entry;
150 pr_debug("adding new link\n");
152 if (!tb[IFLA_LINK] ||
153 !net_eq(dev_net(dev), &init_net))
155 /* find and hold real wpan device */
156 real_dev = dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
159 if (real_dev->type != ARPHRD_IEEE802154) {
164 lowpan_dev_info(dev)->real_dev = real_dev;
165 mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
167 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
170 lowpan_dev_info(dev)->real_dev = NULL;
176 /* Set the lowpan hardware address to the wpan hardware address. */
177 memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
179 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
180 INIT_LIST_HEAD(&entry->list);
181 list_add_tail(&entry->list, &lowpan_devices);
182 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
184 ret = register_netdevice(dev);
186 if (!lowpan_open_count)
194 static void lowpan_dellink(struct net_device *dev, struct list_head *head)
196 struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
197 struct net_device *real_dev = lowpan_dev->real_dev;
198 struct lowpan_dev_record *entry, *tmp;
203 if (!lowpan_open_count)
206 mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
207 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
208 if (entry->ldev == dev) {
209 list_del(&entry->list);
213 mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
215 mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
217 unregister_netdevice_queue(dev, head);
222 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
224 .priv_size = sizeof(struct lowpan_dev_info),
225 .setup = lowpan_setup,
226 .newlink = lowpan_newlink,
227 .dellink = lowpan_dellink,
228 .validate = lowpan_validate,
231 static inline int __init lowpan_netlink_init(void)
233 return rtnl_link_register(&lowpan_link_ops);
236 static inline void lowpan_netlink_fini(void)
238 rtnl_link_unregister(&lowpan_link_ops);
241 static int lowpan_device_event(struct notifier_block *unused,
242 unsigned long event, void *ptr)
244 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
246 struct lowpan_dev_record *entry, *tmp;
248 if (dev->type != ARPHRD_IEEE802154)
251 if (event == NETDEV_UNREGISTER) {
252 list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
253 if (lowpan_dev_info(entry->ldev)->real_dev == dev)
254 lowpan_dellink(entry->ldev, &del_list);
257 unregister_netdevice_many(&del_list);
264 static struct notifier_block lowpan_dev_notifier = {
265 .notifier_call = lowpan_device_event,
268 static int __init lowpan_init_module(void)
272 err = lowpan_net_frag_init();
276 err = lowpan_netlink_init();
280 err = register_netdevice_notifier(&lowpan_dev_notifier);
287 lowpan_netlink_fini();
289 lowpan_net_frag_exit();
294 static void __exit lowpan_cleanup_module(void)
296 lowpan_netlink_fini();
298 lowpan_net_frag_exit();
300 unregister_netdevice_notifier(&lowpan_dev_notifier);
303 module_init(lowpan_init_module);
304 module_exit(lowpan_cleanup_module);
305 MODULE_LICENSE("GPL");
306 MODULE_ALIAS_RTNL_LINK("lowpan");