264 lines
7.0 KiB
C
264 lines
7.0 KiB
C
/* Copyright 2011, Siemens AG
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* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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/* Based on patches from Jon Smirl <jonsmirl@gmail.com>
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* Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* Jon's code is based on 6lowpan implementation for Contiki which is:
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/ieee802154.h>
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#include <net/ipv6.h>
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#include "6lowpan_i.h"
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static int open_count;
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static struct header_ops lowpan_header_ops = {
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.create = lowpan_header_create,
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};
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static struct lock_class_key lowpan_tx_busylock;
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static struct lock_class_key lowpan_netdev_xmit_lock_key;
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static void lowpan_set_lockdep_class_one(struct net_device *dev,
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struct netdev_queue *txq,
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void *_unused)
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{
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lockdep_set_class(&txq->_xmit_lock,
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&lowpan_netdev_xmit_lock_key);
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}
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static int lowpan_dev_init(struct net_device *dev)
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{
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netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
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dev->qdisc_tx_busylock = &lowpan_tx_busylock;
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return 0;
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}
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static const struct net_device_ops lowpan_netdev_ops = {
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.ndo_init = lowpan_dev_init,
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.ndo_start_xmit = lowpan_xmit,
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};
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static void lowpan_setup(struct net_device *dev)
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{
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dev->addr_len = IEEE802154_ADDR_LEN;
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memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
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dev->type = ARPHRD_6LOWPAN;
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/* Frame Control + Sequence Number + Address fields + Security Header */
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dev->hard_header_len = 2 + 1 + 20 + 14;
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dev->needed_tailroom = 2; /* FCS */
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dev->mtu = IPV6_MIN_MTU;
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dev->priv_flags |= IFF_NO_QUEUE;
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dev->flags = IFF_BROADCAST | IFF_MULTICAST;
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dev->watchdog_timeo = 0;
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dev->netdev_ops = &lowpan_netdev_ops;
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dev->header_ops = &lowpan_header_ops;
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dev->destructor = free_netdev;
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dev->features |= NETIF_F_NETNS_LOCAL;
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}
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static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
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return -EINVAL;
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}
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return 0;
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}
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static int lowpan_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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struct net_device *real_dev;
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int ret;
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ASSERT_RTNL();
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pr_debug("adding new link\n");
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if (!tb[IFLA_LINK] ||
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!net_eq(dev_net(dev), &init_net))
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return -EINVAL;
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/* find and hold real wpan device */
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real_dev = dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
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if (!real_dev)
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return -ENODEV;
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if (real_dev->type != ARPHRD_IEEE802154) {
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dev_put(real_dev);
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return -EINVAL;
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}
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if (real_dev->ieee802154_ptr->lowpan_dev) {
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dev_put(real_dev);
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return -EBUSY;
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}
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lowpan_dev_info(dev)->real_dev = real_dev;
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/* Set the lowpan hardware address to the wpan hardware address. */
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memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
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lowpan_netdev_setup(dev, LOWPAN_LLTYPE_IEEE802154);
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ret = register_netdevice(dev);
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if (ret < 0) {
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dev_put(real_dev);
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return ret;
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}
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real_dev->ieee802154_ptr->lowpan_dev = dev;
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if (!open_count)
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lowpan_rx_init();
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open_count++;
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return 0;
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}
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static void lowpan_dellink(struct net_device *dev, struct list_head *head)
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{
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struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
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struct net_device *real_dev = lowpan_dev->real_dev;
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ASSERT_RTNL();
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open_count--;
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if (!open_count)
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lowpan_rx_exit();
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real_dev->ieee802154_ptr->lowpan_dev = NULL;
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unregister_netdevice(dev);
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dev_put(real_dev);
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}
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static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
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.kind = "lowpan",
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.priv_size = LOWPAN_PRIV_SIZE(sizeof(struct lowpan_dev_info)),
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.setup = lowpan_setup,
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.newlink = lowpan_newlink,
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.dellink = lowpan_dellink,
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.validate = lowpan_validate,
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};
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static inline int __init lowpan_netlink_init(void)
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{
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return rtnl_link_register(&lowpan_link_ops);
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}
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static inline void lowpan_netlink_fini(void)
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{
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rtnl_link_unregister(&lowpan_link_ops);
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}
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static int lowpan_device_event(struct notifier_block *unused,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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if (dev->type != ARPHRD_IEEE802154)
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goto out;
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switch (event) {
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case NETDEV_UNREGISTER:
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/* Check if wpan interface is unregistered that we
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* also delete possible lowpan interfaces which belongs
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* to the wpan interface.
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*/
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if (dev->ieee802154_ptr && dev->ieee802154_ptr->lowpan_dev)
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lowpan_dellink(dev->ieee802154_ptr->lowpan_dev, NULL);
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break;
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default:
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break;
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}
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out:
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return NOTIFY_DONE;
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}
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static struct notifier_block lowpan_dev_notifier = {
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.notifier_call = lowpan_device_event,
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};
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static int __init lowpan_init_module(void)
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{
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int err = 0;
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err = lowpan_net_frag_init();
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if (err < 0)
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goto out;
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err = lowpan_netlink_init();
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if (err < 0)
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goto out_frag;
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err = register_netdevice_notifier(&lowpan_dev_notifier);
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if (err < 0)
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goto out_pack;
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return 0;
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out_pack:
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lowpan_netlink_fini();
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out_frag:
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lowpan_net_frag_exit();
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out:
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return err;
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}
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static void __exit lowpan_cleanup_module(void)
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{
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lowpan_netlink_fini();
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lowpan_net_frag_exit();
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unregister_netdevice_notifier(&lowpan_dev_notifier);
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}
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module_init(lowpan_init_module);
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module_exit(lowpan_cleanup_module);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_RTNL_LINK("lowpan");
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