forked from Minki/linux
c4cb901ac6
This patch correct the return value of lowpan_alloc_frag if an error occur. Errno numbers should always be negative. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
688 lines
18 KiB
C
688 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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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 void lowpan_address_flip(u8 *src, u8 *dest)
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{
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int i;
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for (i = 0; i < IEEE802154_ADDR_LEN; i++)
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(dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
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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 ieee802154_addr sa, da;
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struct ieee802154_mac_cb *cb = mac_cb_init(skb);
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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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lowpan_header_compress(skb, dev, type, daddr, saddr, len);
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/* NOTE1: I'm still unsure about the fact that compression and WPAN
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* header are created here and not later in the xmit. So wait for
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* an opinion of net maintainers.
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*/
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/* NOTE2: to be absolutely correct, we must derive PANid information
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* from MAC subif of the 'dev' and 'real_dev' network devices, but
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* this isn't implemented in mainline yet, so currently we assign 0xff
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*/
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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(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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} 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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}
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cb->ackreq = !lowpan_is_addr_broadcast(daddr);
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return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
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type, (void *)&da, (void *)&sa, 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 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;
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pr_debug("package xmit\n");
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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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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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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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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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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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.ndo_set_mac_address = lowpan_set_address,
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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)
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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_IEEE802154;
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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 = 1281;
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dev->tx_queue_len = 0;
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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->ml_priv = &lowpan_mlme;
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dev->destructor = free_netdev;
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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_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct ieee802154_hdr hdr;
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int ret;
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (!skb)
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goto drop;
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if (!netif_running(dev))
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goto drop_skb;
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if (dev->type != ARPHRD_IEEE802154)
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goto drop_skb;
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if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
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goto drop_skb;
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/* check that it's our buffer */
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if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
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skb->protocol = htons(ETH_P_IPV6);
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skb->pkt_type = PACKET_HOST;
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/* Pull off the 1-byte of 6lowpan header. */
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skb_pull(skb, 1);
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ret = lowpan_give_skb_to_devices(skb, NULL);
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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");
|