| /* 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" |
| |
| static int open_count; |
| |
| 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 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->priv_flags |= IFF_NO_QUEUE; |
| dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
| dev->watchdog_timeo = 0; |
| |
| dev->netdev_ops = &lowpan_netdev_ops; |
| dev->header_ops = &lowpan_header_ops; |
| 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; |
| 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; |
| } |
| |
| if (real_dev->ieee802154_ptr->lowpan_dev) { |
| dev_put(real_dev); |
| return -EBUSY; |
| } |
| |
| lowpan_dev_info(dev)->real_dev = real_dev; |
| /* Set the lowpan hardware address to the wpan hardware address. */ |
| memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN); |
| |
| lowpan_netdev_setup(dev, LOWPAN_LLTYPE_IEEE802154); |
| |
| ret = register_netdevice(dev); |
| if (ret < 0) { |
| dev_put(real_dev); |
| return ret; |
| } |
| |
| real_dev->ieee802154_ptr->lowpan_dev = dev; |
| if (!open_count) |
| lowpan_rx_init(); |
| |
| open_count++; |
| |
| return 0; |
| } |
| |
| 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; |
| |
| ASSERT_RTNL(); |
| |
| open_count--; |
| |
| if (!open_count) |
| lowpan_rx_exit(); |
| |
| real_dev->ieee802154_ptr->lowpan_dev = NULL; |
| unregister_netdevice(dev); |
| dev_put(real_dev); |
| } |
| |
| static struct rtnl_link_ops lowpan_link_ops __read_mostly = { |
| .kind = "lowpan", |
| .priv_size = 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); |
| |
| if (dev->type != ARPHRD_IEEE802154) |
| goto out; |
| |
| switch (event) { |
| case NETDEV_UNREGISTER: |
| /* Check if wpan interface is unregistered that we |
| * also delete possible lowpan interfaces which belongs |
| * to the wpan interface. |
| */ |
| if (dev->ieee802154_ptr && dev->ieee802154_ptr->lowpan_dev) |
| lowpan_dellink(dev->ieee802154_ptr->lowpan_dev, NULL); |
| break; |
| default: |
| break; |
| } |
| |
| 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"); |