![Simon Vincent](/assets/img/avatar_default.png)
The 6lowpan ipv6 header compression was causing problems for other interfaces that expected a ipv6 header to still be in place, as we were replacing the ipv6 header with a compressed version. This happened if you sent a packet to a multicast address as the packet would be output on 802.15.4, ethernet, and also be sent to the loopback interface. The skb data was shared between these interfaces so all interfaces ended up with a compressed ipv6 header. The solution is to ensure that before we do any header compression we are not sharing the skb or skb data with any other interface. If we are then we must take a copy of the skb and skb data before modifying the ipv6 header. The only place we can copy the skb is inside the xmit function so we don't leave dangling references to skb. This patch moves all the header compression to inside the xmit function. Very little code has been changed it has mostly been moved from lowpan_header_create to lowpan_xmit. At the top of the xmit function we now check if the skb is shared and if so copy it. In lowpan_header_create all we do now is store the source and destination addresses for use later when we compress the header. Signed-off-by: Simon Vincent <simon.vincent@xsilon.com> Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
733 lines
18 KiB
C
733 lines
18 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/bitops.h>
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#include <linux/if_arp.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netdevice.h>
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#include <net/af_ieee802154.h>
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#include <net/ieee802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/6lowpan.h>
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#include <net/ipv6.h>
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#include "reassembly.h"
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static LIST_HEAD(lowpan_devices);
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/* private device info */
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struct lowpan_dev_info {
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struct net_device *real_dev; /* real WPAN device ptr */
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struct mutex dev_list_mtx; /* mutex for list ops */
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__be16 fragment_tag;
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};
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struct lowpan_dev_record {
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struct net_device *ldev;
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struct list_head list;
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};
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/* don't save pan id, it's intra pan */
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struct lowpan_addr {
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u8 mode;
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union {
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/* IPv6 needs big endian here */
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__be64 extended_addr;
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__be16 short_addr;
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} u;
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};
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struct lowpan_addr_info {
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struct lowpan_addr daddr;
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struct lowpan_addr saddr;
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};
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static inline struct
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lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
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{
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return netdev_priv(dev);
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}
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static inline struct
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lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb)
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{
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WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info));
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return (struct lowpan_addr_info *)(skb->data -
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sizeof(struct lowpan_addr_info));
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}
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static int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *_daddr,
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const void *_saddr, unsigned int len)
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{
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const u8 *saddr = _saddr;
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const u8 *daddr = _daddr;
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struct lowpan_addr_info *info;
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/* TODO:
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* if this package isn't ipv6 one, where should it be routed?
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*/
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if (type != ETH_P_IPV6)
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return 0;
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if (!saddr)
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saddr = dev->dev_addr;
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raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
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raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
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info = lowpan_skb_priv(skb);
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/* TODO: Currently we only support extended_addr */
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info->daddr.mode = IEEE802154_ADDR_LONG;
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memcpy(&info->daddr.u.extended_addr, daddr,
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sizeof(info->daddr.u.extended_addr));
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info->saddr.mode = IEEE802154_ADDR_LONG;
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memcpy(&info->saddr.u.extended_addr, saddr,
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sizeof(info->daddr.u.extended_addr));
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return 0;
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}
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static int lowpan_give_skb_to_devices(struct sk_buff *skb,
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struct net_device *dev)
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{
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struct lowpan_dev_record *entry;
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struct sk_buff *skb_cp;
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int stat = NET_RX_SUCCESS;
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rcu_read_lock();
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list_for_each_entry_rcu(entry, &lowpan_devices, list)
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if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
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skb_cp = skb_copy(skb, GFP_ATOMIC);
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if (!skb_cp) {
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stat = -ENOMEM;
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break;
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}
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skb_cp->dev = entry->ldev;
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stat = netif_rx(skb_cp);
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}
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rcu_read_unlock();
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return stat;
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}
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static int process_data(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
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{
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u8 iphc0, iphc1;
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struct ieee802154_addr_sa sa, da;
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void *sap, *dap;
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raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
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/* at least two bytes will be used for the encoding */
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if (skb->len < 2)
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goto drop;
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if (lowpan_fetch_skb_u8(skb, &iphc0))
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goto drop;
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if (lowpan_fetch_skb_u8(skb, &iphc1))
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goto drop;
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ieee802154_addr_to_sa(&sa, &hdr->source);
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ieee802154_addr_to_sa(&da, &hdr->dest);
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if (sa.addr_type == IEEE802154_ADDR_SHORT)
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sap = &sa.short_addr;
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else
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sap = &sa.hwaddr;
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if (da.addr_type == IEEE802154_ADDR_SHORT)
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dap = &da.short_addr;
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else
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dap = &da.hwaddr;
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return lowpan_process_data(skb, skb->dev, sap, sa.addr_type,
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IEEE802154_ADDR_LEN, dap, da.addr_type,
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IEEE802154_ADDR_LEN, iphc0, iphc1,
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lowpan_give_skb_to_devices);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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static int lowpan_set_address(struct net_device *dev, void *p)
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{
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struct sockaddr *sa = p;
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if (netif_running(dev))
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return -EBUSY;
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/* TODO: validate addr */
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memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
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return 0;
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}
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static struct sk_buff*
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lowpan_alloc_frag(struct sk_buff *skb, int size,
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const struct ieee802154_hdr *master_hdr)
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{
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struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev;
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struct sk_buff *frag;
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int rc;
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frag = alloc_skb(real_dev->hard_header_len +
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real_dev->needed_tailroom + size,
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GFP_ATOMIC);
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if (likely(frag)) {
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frag->dev = real_dev;
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frag->priority = skb->priority;
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skb_reserve(frag, real_dev->hard_header_len);
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skb_reset_network_header(frag);
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*mac_cb(frag) = *mac_cb(skb);
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rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest,
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&master_hdr->source, size);
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if (rc < 0) {
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kfree_skb(frag);
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return ERR_PTR(-rc);
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}
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} else {
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frag = ERR_PTR(-ENOMEM);
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}
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return frag;
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}
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static int
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lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
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u8 *frag_hdr, int frag_hdrlen,
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int offset, int len)
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{
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struct sk_buff *frag;
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raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen);
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frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr);
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if (IS_ERR(frag))
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return -PTR_ERR(frag);
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memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen);
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memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len);
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raw_dump_table(__func__, " fragment dump", frag->data, frag->len);
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return dev_queue_xmit(frag);
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}
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static int
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lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
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const struct ieee802154_hdr *wpan_hdr)
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{
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u16 dgram_size, dgram_offset;
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__be16 frag_tag;
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u8 frag_hdr[5];
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int frag_cap, frag_len, payload_cap, rc;
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int skb_unprocessed, skb_offset;
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dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
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skb->mac_len;
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frag_tag = lowpan_dev_info(dev)->fragment_tag++;
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frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07);
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frag_hdr[1] = dgram_size & 0xff;
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memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag));
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payload_cap = ieee802154_max_payload(wpan_hdr);
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frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE -
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skb_network_header_len(skb), 8);
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skb_offset = skb_network_header_len(skb);
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skb_unprocessed = skb->len - skb->mac_len - skb_offset;
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rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
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LOWPAN_FRAG1_HEAD_SIZE, 0,
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frag_len + skb_network_header_len(skb));
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if (rc) {
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pr_debug("%s unable to send FRAG1 packet (tag: %d)",
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__func__, frag_tag);
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goto err;
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}
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frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1;
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frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN;
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frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8);
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do {
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dgram_offset += frag_len;
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skb_offset += frag_len;
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skb_unprocessed -= frag_len;
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frag_len = min(frag_cap, skb_unprocessed);
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frag_hdr[4] = dgram_offset >> 3;
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rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
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LOWPAN_FRAGN_HEAD_SIZE, skb_offset,
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frag_len);
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if (rc) {
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pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
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__func__, frag_tag, skb_offset);
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goto err;
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}
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} while (skb_unprocessed > frag_cap);
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consume_skb(skb);
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return NET_XMIT_SUCCESS;
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err:
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kfree_skb(skb);
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return rc;
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}
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static int lowpan_header(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee802154_addr sa, da;
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struct ieee802154_mac_cb *cb = mac_cb_init(skb);
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struct lowpan_addr_info info;
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void *daddr, *saddr;
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memcpy(&info, lowpan_skb_priv(skb), sizeof(info));
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/* TODO: Currently we only support extended_addr */
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daddr = &info.daddr.u.extended_addr;
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saddr = &info.saddr.u.extended_addr;
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lowpan_header_compress(skb, dev, ETH_P_IPV6, daddr, saddr, skb->len);
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cb->type = IEEE802154_FC_TYPE_DATA;
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/* prepare wpan address data */
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sa.mode = IEEE802154_ADDR_LONG;
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sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
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sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
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/* intra-PAN communications */
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da.pan_id = sa.pan_id;
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/* if the destination address is the broadcast address, use the
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* corresponding short address
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*/
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if (lowpan_is_addr_broadcast((const u8 *)daddr)) {
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da.mode = IEEE802154_ADDR_SHORT;
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da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
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cb->ackreq = false;
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} else {
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da.mode = IEEE802154_ADDR_LONG;
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da.extended_addr = ieee802154_devaddr_from_raw(daddr);
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cb->ackreq = true;
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}
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return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
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ETH_P_IPV6, (void *)&da, (void *)&sa, 0);
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}
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static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee802154_hdr wpan_hdr;
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int max_single, ret;
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pr_debug("package xmit\n");
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/* We must take a copy of the skb before we modify/replace the ipv6
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* header as the header could be used elsewhere
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*/
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (!skb)
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return NET_XMIT_DROP;
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ret = lowpan_header(skb, dev);
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if (ret < 0) {
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) {
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kfree_skb(skb);
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return NET_XMIT_DROP;
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}
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max_single = ieee802154_max_payload(&wpan_hdr);
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if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) {
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skb->dev = lowpan_dev_info(dev)->real_dev;
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return dev_queue_xmit(skb);
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} else {
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netdev_tx_t rc;
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pr_debug("frame is too big, fragmentation is needed\n");
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rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr);
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return rc < 0 ? NET_XMIT_DROP : rc;
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}
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}
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static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
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{
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struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
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return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
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}
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|
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static __le16 lowpan_get_pan_id(const struct net_device *dev)
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{
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struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
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return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
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}
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|
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static __le16 lowpan_get_short_addr(const struct net_device *dev)
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{
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struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
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return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
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}
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|
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static u8 lowpan_get_dsn(const struct net_device *dev)
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{
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struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
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return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
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}
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|
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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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|
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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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|
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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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|
|
|
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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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|
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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_set_mac_address = lowpan_set_address,
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};
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|
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static struct ieee802154_mlme_ops lowpan_mlme = {
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.get_pan_id = lowpan_get_pan_id,
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.get_phy = lowpan_get_phy,
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.get_short_addr = lowpan_get_short_addr,
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.get_dsn = lowpan_get_dsn,
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};
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|
|
static void lowpan_setup(struct net_device *dev)
|
|
{
|
|
dev->addr_len = IEEE802154_ADDR_LEN;
|
|
memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
|
|
dev->type = ARPHRD_IEEE802154;
|
|
/* 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->tx_queue_len = 0;
|
|
dev->flags = IFF_BROADCAST | IFF_MULTICAST;
|
|
dev->watchdog_timeo = 0;
|
|
|
|
dev->netdev_ops = &lowpan_netdev_ops;
|
|
dev->header_ops = &lowpan_header_ops;
|
|
dev->ml_priv = &lowpan_mlme;
|
|
dev->destructor = free_netdev;
|
|
}
|
|
|
|
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_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct ieee802154_hdr hdr;
|
|
int ret;
|
|
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (!skb)
|
|
goto drop;
|
|
|
|
if (!netif_running(dev))
|
|
goto drop_skb;
|
|
|
|
if (dev->type != ARPHRD_IEEE802154)
|
|
goto drop_skb;
|
|
|
|
if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
|
|
goto drop_skb;
|
|
|
|
/* check that it's our buffer */
|
|
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->pkt_type = PACKET_HOST;
|
|
|
|
/* Pull off the 1-byte of 6lowpan header. */
|
|
skb_pull(skb, 1);
|
|
|
|
ret = lowpan_give_skb_to_devices(skb, NULL);
|
|
if (ret == NET_RX_DROP)
|
|
goto drop;
|
|
} else {
|
|
switch (skb->data[0] & 0xe0) {
|
|
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
|
|
ret = process_data(skb, &hdr);
|
|
if (ret == NET_RX_DROP)
|
|
goto drop;
|
|
break;
|
|
case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
|
|
ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
|
|
if (ret == 1) {
|
|
ret = process_data(skb, &hdr);
|
|
if (ret == NET_RX_DROP)
|
|
goto drop;
|
|
}
|
|
break;
|
|
case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
|
|
ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
|
|
if (ret == 1) {
|
|
ret = process_data(skb, &hdr);
|
|
if (ret == NET_RX_DROP)
|
|
goto drop;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return NET_RX_SUCCESS;
|
|
drop_skb:
|
|
kfree_skb(skb);
|
|
drop:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static int lowpan_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct net_device *real_dev;
|
|
struct lowpan_dev_record *entry;
|
|
|
|
pr_debug("adding new link\n");
|
|
|
|
if (!tb[IFLA_LINK])
|
|
return -EINVAL;
|
|
/* find and hold real wpan device */
|
|
real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
|
|
if (!real_dev)
|
|
return -ENODEV;
|
|
if (real_dev->type != ARPHRD_IEEE802154) {
|
|
dev_put(real_dev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
lowpan_dev_info(dev)->real_dev = real_dev;
|
|
mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (!entry) {
|
|
dev_put(real_dev);
|
|
lowpan_dev_info(dev)->real_dev = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
entry->ldev = dev;
|
|
|
|
/* Set the lowpan harware address to the wpan hardware address. */
|
|
memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
|
|
|
|
mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
INIT_LIST_HEAD(&entry->list);
|
|
list_add_tail(&entry->list, &lowpan_devices);
|
|
mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
|
|
register_netdevice(dev);
|
|
|
|
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;
|
|
struct lowpan_dev_record *entry, *tmp;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
|
|
if (entry->ldev == dev) {
|
|
list_del(&entry->list);
|
|
kfree(entry);
|
|
}
|
|
}
|
|
mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
|
|
mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
|
|
unregister_netdevice_queue(dev, head);
|
|
|
|
dev_put(real_dev);
|
|
}
|
|
|
|
static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
|
|
.kind = "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);
|
|
LIST_HEAD(del_list);
|
|
struct lowpan_dev_record *entry, *tmp;
|
|
|
|
if (dev->type != ARPHRD_IEEE802154)
|
|
goto out;
|
|
|
|
if (event == NETDEV_UNREGISTER) {
|
|
list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
|
|
if (lowpan_dev_info(entry->ldev)->real_dev == dev)
|
|
lowpan_dellink(entry->ldev, &del_list);
|
|
}
|
|
|
|
unregister_netdevice_many(&del_list);
|
|
}
|
|
|
|
out:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block lowpan_dev_notifier = {
|
|
.notifier_call = lowpan_device_event,
|
|
};
|
|
|
|
static struct packet_type lowpan_packet_type = {
|
|
.type = htons(ETH_P_IEEE802154),
|
|
.func = lowpan_rcv,
|
|
};
|
|
|
|
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;
|
|
|
|
dev_add_pack(&lowpan_packet_type);
|
|
|
|
err = register_netdevice_notifier(&lowpan_dev_notifier);
|
|
if (err < 0)
|
|
goto out_pack;
|
|
|
|
return 0;
|
|
|
|
out_pack:
|
|
dev_remove_pack(&lowpan_packet_type);
|
|
lowpan_netlink_fini();
|
|
out_frag:
|
|
lowpan_net_frag_exit();
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit lowpan_cleanup_module(void)
|
|
{
|
|
lowpan_netlink_fini();
|
|
|
|
dev_remove_pack(&lowpan_packet_type);
|
|
|
|
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");
|