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283 lines
7.6 KiB
283 lines
7.6 KiB
/* Copyright 2011, Siemens AG |
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* written by Alexander Smirnov <[email protected]> |
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*/ |
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/* Based on patches from Jon Smirl <[email protected]> |
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* Copyright (c) 2011 Jon Smirl <[email protected]> |
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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 const struct header_ops lowpan_header_ops = { |
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.create = lowpan_header_create, |
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}; |
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static int lowpan_dev_init(struct net_device *ldev) |
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{ |
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netdev_lockdep_set_classes(ldev); |
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return 0; |
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} |
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static int lowpan_open(struct net_device *dev) |
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{ |
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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 int lowpan_stop(struct net_device *dev) |
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{ |
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open_count--; |
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if (!open_count) |
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lowpan_rx_exit(); |
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return 0; |
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} |
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static int lowpan_neigh_construct(struct net_device *dev, struct neighbour *n) |
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{ |
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struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n)); |
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/* default no short_addr is available for a neighbour */ |
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neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC); |
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return 0; |
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} |
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static int lowpan_get_iflink(const struct net_device *dev) |
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{ |
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return lowpan_802154_dev(dev)->wdev->ifindex; |
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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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.ndo_open = lowpan_open, |
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.ndo_stop = lowpan_stop, |
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.ndo_neigh_construct = lowpan_neigh_construct, |
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.ndo_get_iflink = lowpan_get_iflink, |
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}; |
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static void lowpan_setup(struct net_device *ldev) |
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{ |
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memset(ldev->broadcast, 0xff, IEEE802154_ADDR_LEN); |
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/* We need an ipv6hdr as minimum len when calling xmit */ |
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ldev->hard_header_len = sizeof(struct ipv6hdr); |
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ldev->flags = IFF_BROADCAST | IFF_MULTICAST; |
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ldev->priv_flags |= IFF_NO_QUEUE; |
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ldev->netdev_ops = &lowpan_netdev_ops; |
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ldev->header_ops = &lowpan_header_ops; |
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ldev->needs_free_netdev = true; |
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ldev->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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struct netlink_ext_ack *extack) |
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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 *ldev, |
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struct nlattr *tb[], struct nlattr *data[], |
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struct netlink_ext_ack *extack) |
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{ |
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struct net_device *wdev; |
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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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return -EINVAL; |
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/* find and hold wpan device */ |
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wdev = dev_get_by_index(dev_net(ldev), nla_get_u32(tb[IFLA_LINK])); |
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if (!wdev) |
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return -ENODEV; |
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if (wdev->type != ARPHRD_IEEE802154) { |
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dev_put(wdev); |
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return -EINVAL; |
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} |
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if (wdev->ieee802154_ptr->lowpan_dev) { |
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dev_put(wdev); |
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return -EBUSY; |
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} |
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lowpan_802154_dev(ldev)->wdev = wdev; |
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/* Set the lowpan hardware address to the wpan hardware address. */ |
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memcpy(ldev->dev_addr, wdev->dev_addr, IEEE802154_ADDR_LEN); |
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/* We need headroom for possible wpan_dev_hard_header call and tailroom |
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* for encryption/fcs handling. The lowpan interface will replace |
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* the IPv6 header with 6LoWPAN header. At worst case the 6LoWPAN |
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* header has LOWPAN_IPHC_MAX_HEADER_LEN more bytes than the IPv6 |
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* header. |
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*/ |
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ldev->needed_headroom = LOWPAN_IPHC_MAX_HEADER_LEN + |
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wdev->needed_headroom; |
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ldev->needed_tailroom = wdev->needed_tailroom; |
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ldev->neigh_priv_len = sizeof(struct lowpan_802154_neigh); |
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ret = lowpan_register_netdevice(ldev, LOWPAN_LLTYPE_IEEE802154); |
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if (ret < 0) { |
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dev_put(wdev); |
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return ret; |
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} |
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wdev->ieee802154_ptr->lowpan_dev = ldev; |
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return 0; |
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} |
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static void lowpan_dellink(struct net_device *ldev, struct list_head *head) |
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{ |
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struct net_device *wdev = lowpan_802154_dev(ldev)->wdev; |
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ASSERT_RTNL(); |
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wdev->ieee802154_ptr->lowpan_dev = NULL; |
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lowpan_unregister_netdevice(ldev); |
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dev_put(wdev); |
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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_802154_dev)), |
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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 *ndev = netdev_notifier_info_to_dev(ptr); |
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struct wpan_dev *wpan_dev; |
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if (ndev->type != ARPHRD_IEEE802154) |
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return NOTIFY_DONE; |
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wpan_dev = ndev->ieee802154_ptr; |
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if (!wpan_dev) |
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return NOTIFY_DONE; |
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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 (wpan_dev->lowpan_dev) |
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lowpan_dellink(wpan_dev->lowpan_dev, NULL); |
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break; |
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default: |
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return NOTIFY_DONE; |
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} |
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return NOTIFY_OK; |
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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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