| /* 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 const struct header_ops lowpan_header_ops = { |
| .create = lowpan_header_create, |
| }; |
| |
| static int lowpan_dev_init(struct net_device *ldev) |
| { |
| netdev_lockdep_set_classes(ldev); |
| |
| return 0; |
| } |
| |
| static int lowpan_open(struct net_device *dev) |
| { |
| if (!open_count) |
| lowpan_rx_init(); |
| open_count++; |
| return 0; |
| } |
| |
| static int lowpan_stop(struct net_device *dev) |
| { |
| open_count--; |
| if (!open_count) |
| lowpan_rx_exit(); |
| return 0; |
| } |
| |
| static int lowpan_neigh_construct(struct net_device *dev, struct neighbour *n) |
| { |
| struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n)); |
| |
| /* default no short_addr is available for a neighbour */ |
| neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC); |
| return 0; |
| } |
| |
| static int lowpan_get_iflink(const struct net_device *dev) |
| { |
| return lowpan_802154_dev(dev)->wdev->ifindex; |
| } |
| |
| static const struct net_device_ops lowpan_netdev_ops = { |
| .ndo_init = lowpan_dev_init, |
| .ndo_start_xmit = lowpan_xmit, |
| .ndo_open = lowpan_open, |
| .ndo_stop = lowpan_stop, |
| .ndo_neigh_construct = lowpan_neigh_construct, |
| .ndo_get_iflink = lowpan_get_iflink, |
| }; |
| |
| static void lowpan_setup(struct net_device *ldev) |
| { |
| memset(ldev->broadcast, 0xff, IEEE802154_ADDR_LEN); |
| /* We need an ipv6hdr as minimum len when calling xmit */ |
| ldev->hard_header_len = sizeof(struct ipv6hdr); |
| ldev->flags = IFF_BROADCAST | IFF_MULTICAST; |
| ldev->priv_flags |= IFF_NO_QUEUE; |
| |
| ldev->netdev_ops = &lowpan_netdev_ops; |
| ldev->header_ops = &lowpan_header_ops; |
| ldev->needs_free_netdev = true; |
| ldev->features |= NETIF_F_NETNS_LOCAL; |
| } |
| |
| static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| 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 *ldev, |
| struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct net_device *wdev; |
| int ret; |
| |
| ASSERT_RTNL(); |
| |
| pr_debug("adding new link\n"); |
| |
| if (!tb[IFLA_LINK]) |
| return -EINVAL; |
| /* find and hold wpan device */ |
| wdev = dev_get_by_index(dev_net(ldev), nla_get_u32(tb[IFLA_LINK])); |
| if (!wdev) |
| return -ENODEV; |
| if (wdev->type != ARPHRD_IEEE802154) { |
| dev_put(wdev); |
| return -EINVAL; |
| } |
| |
| if (wdev->ieee802154_ptr->lowpan_dev) { |
| dev_put(wdev); |
| return -EBUSY; |
| } |
| |
| lowpan_802154_dev(ldev)->wdev = wdev; |
| /* Set the lowpan hardware address to the wpan hardware address. */ |
| memcpy(ldev->dev_addr, wdev->dev_addr, IEEE802154_ADDR_LEN); |
| /* We need headroom for possible wpan_dev_hard_header call and tailroom |
| * for encryption/fcs handling. The lowpan interface will replace |
| * the IPv6 header with 6LoWPAN header. At worst case the 6LoWPAN |
| * header has LOWPAN_IPHC_MAX_HEADER_LEN more bytes than the IPv6 |
| * header. |
| */ |
| ldev->needed_headroom = LOWPAN_IPHC_MAX_HEADER_LEN + |
| wdev->needed_headroom; |
| ldev->needed_tailroom = wdev->needed_tailroom; |
| |
| ldev->neigh_priv_len = sizeof(struct lowpan_802154_neigh); |
| |
| ret = lowpan_register_netdevice(ldev, LOWPAN_LLTYPE_IEEE802154); |
| if (ret < 0) { |
| dev_put(wdev); |
| return ret; |
| } |
| |
| wdev->ieee802154_ptr->lowpan_dev = ldev; |
| return 0; |
| } |
| |
| static void lowpan_dellink(struct net_device *ldev, struct list_head *head) |
| { |
| struct net_device *wdev = lowpan_802154_dev(ldev)->wdev; |
| |
| ASSERT_RTNL(); |
| |
| wdev->ieee802154_ptr->lowpan_dev = NULL; |
| lowpan_unregister_netdevice(ldev); |
| dev_put(wdev); |
| } |
| |
| static struct rtnl_link_ops lowpan_link_ops __read_mostly = { |
| .kind = "lowpan", |
| .priv_size = LOWPAN_PRIV_SIZE(sizeof(struct lowpan_802154_dev)), |
| .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 *ndev = netdev_notifier_info_to_dev(ptr); |
| struct wpan_dev *wpan_dev; |
| |
| if (ndev->type != ARPHRD_IEEE802154) |
| return NOTIFY_DONE; |
| wpan_dev = ndev->ieee802154_ptr; |
| if (!wpan_dev) |
| return NOTIFY_DONE; |
| |
| 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 (wpan_dev->lowpan_dev) |
| lowpan_dellink(wpan_dev->lowpan_dev, NULL); |
| break; |
| default: |
| return NOTIFY_DONE; |
| } |
| |
| return NOTIFY_OK; |
| } |
| |
| 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"); |