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 static int open_count;
57 static struct header_ops lowpan_header_ops = {
58 .create = lowpan_header_create,
61 static int lowpan_dev_init(struct net_device *ldev)
63 netdev_lockdep_set_classes(ldev);
68 static int lowpan_open(struct net_device *dev)
76 static int lowpan_stop(struct net_device *dev)
84 static int lowpan_neigh_construct(struct net_device *dev, struct neighbour *n)
86 struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n));
88 /* default no short_addr is available for a neighbour */
89 neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC);
93 static int lowpan_get_iflink(const struct net_device *dev)
95 return lowpan_802154_dev(dev)->wdev->ifindex;
98 static const struct net_device_ops lowpan_netdev_ops = {
99 .ndo_init = lowpan_dev_init,
100 .ndo_start_xmit = lowpan_xmit,
101 .ndo_open = lowpan_open,
102 .ndo_stop = lowpan_stop,
103 .ndo_neigh_construct = lowpan_neigh_construct,
104 .ndo_get_iflink = lowpan_get_iflink,
107 static void lowpan_setup(struct net_device *ldev)
109 memset(ldev->broadcast, 0xff, IEEE802154_ADDR_LEN);
110 /* We need an ipv6hdr as minimum len when calling xmit */
111 ldev->hard_header_len = sizeof(struct ipv6hdr);
112 ldev->flags = IFF_BROADCAST | IFF_MULTICAST;
114 ldev->netdev_ops = &lowpan_netdev_ops;
115 ldev->header_ops = &lowpan_header_ops;
116 ldev->destructor = free_netdev;
117 ldev->features |= NETIF_F_NETNS_LOCAL;
120 static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
122 if (tb[IFLA_ADDRESS]) {
123 if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
129 static int lowpan_newlink(struct net *src_net, struct net_device *ldev,
130 struct nlattr *tb[], struct nlattr *data[])
132 struct net_device *wdev;
137 pr_debug("adding new link\n");
141 /* find and hold wpan device */
142 wdev = dev_get_by_index(dev_net(ldev), nla_get_u32(tb[IFLA_LINK]));
145 if (wdev->type != ARPHRD_IEEE802154) {
150 if (wdev->ieee802154_ptr->lowpan_dev) {
155 lowpan_802154_dev(ldev)->wdev = wdev;
156 /* Set the lowpan hardware address to the wpan hardware address. */
157 memcpy(ldev->dev_addr, wdev->dev_addr, IEEE802154_ADDR_LEN);
158 /* We need headroom for possible wpan_dev_hard_header call and tailroom
159 * for encryption/fcs handling. The lowpan interface will replace
160 * the IPv6 header with 6LoWPAN header. At worst case the 6LoWPAN
161 * header has LOWPAN_IPHC_MAX_HEADER_LEN more bytes than the IPv6
164 ldev->needed_headroom = LOWPAN_IPHC_MAX_HEADER_LEN +
165 wdev->needed_headroom;
166 ldev->needed_tailroom = wdev->needed_tailroom;
168 ldev->neigh_priv_len = sizeof(struct lowpan_802154_neigh);
170 ret = lowpan_register_netdevice(ldev, LOWPAN_LLTYPE_IEEE802154);
176 wdev->ieee802154_ptr->lowpan_dev = ldev;
180 static void lowpan_dellink(struct net_device *ldev, struct list_head *head)
182 struct net_device *wdev = lowpan_802154_dev(ldev)->wdev;
186 wdev->ieee802154_ptr->lowpan_dev = NULL;
187 lowpan_unregister_netdevice(ldev);
191 static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
193 .priv_size = LOWPAN_PRIV_SIZE(sizeof(struct lowpan_802154_dev)),
194 .setup = lowpan_setup,
195 .newlink = lowpan_newlink,
196 .dellink = lowpan_dellink,
197 .validate = lowpan_validate,
200 static inline int __init lowpan_netlink_init(void)
202 return rtnl_link_register(&lowpan_link_ops);
205 static inline void lowpan_netlink_fini(void)
207 rtnl_link_unregister(&lowpan_link_ops);
210 static int lowpan_device_event(struct notifier_block *unused,
211 unsigned long event, void *ptr)
213 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
214 struct wpan_dev *wpan_dev;
216 if (ndev->type != ARPHRD_IEEE802154)
218 wpan_dev = ndev->ieee802154_ptr;
223 case NETDEV_UNREGISTER:
224 /* Check if wpan interface is unregistered that we
225 * also delete possible lowpan interfaces which belongs
226 * to the wpan interface.
228 if (wpan_dev->lowpan_dev)
229 lowpan_dellink(wpan_dev->lowpan_dev, NULL);
238 static struct notifier_block lowpan_dev_notifier = {
239 .notifier_call = lowpan_device_event,
242 static int __init lowpan_init_module(void)
246 err = lowpan_net_frag_init();
250 err = lowpan_netlink_init();
254 err = register_netdevice_notifier(&lowpan_dev_notifier);
261 lowpan_netlink_fini();
263 lowpan_net_frag_exit();
268 static void __exit lowpan_cleanup_module(void)
270 lowpan_netlink_fini();
272 lowpan_net_frag_exit();
274 unregister_netdevice_notifier(&lowpan_dev_notifier);
277 module_init(lowpan_init_module);
278 module_exit(lowpan_cleanup_module);
279 MODULE_LICENSE("GPL");
280 MODULE_ALIAS_RTNL_LINK("lowpan");