![David S. Miller](/assets/img/avatar_default.png)
Conflicts: drivers/net/ethernet/intel/e1000e/param.c drivers/net/wireless/iwlwifi/iwl-agn-rx.c drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c drivers/net/wireless/iwlwifi/iwl-trans.h Resolved the iwlwifi conflict with mainline using 3-way diff posted by John Linville and Stephen Rothwell. In 'net' we added a bug fix to make iwlwifi report a more accurate skb->truesize but this conflicted with RX path changes that happened meanwhile in net-next. In e1000e a conflict arose in the validation code for settings of adapter->itr. 'net-next' had more sophisticated logic so that logic was used. Signed-off-by: David S. Miller <davem@davemloft.net>
1279 lines
33 KiB
C
1279 lines
33 KiB
C
/*
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* 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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/*
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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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 <linux/etherdevice.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/ipv6.h>
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#include "6lowpan.h"
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/* TTL uncompression values */
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static const u8 lowpan_ttl_values[] = {0, 1, 64, 255};
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static LIST_HEAD(lowpan_devices);
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/*
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* Uncompression of linklocal:
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* 0 -> 16 bytes from packet
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* 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet
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* 2 -> 2 bytes from prefix - zeroes + 2 from packet
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* 3 -> 2 bytes from prefix - infer 8 bytes from lladdr
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*
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* NOTE: => the uncompress function does change 0xf to 0x10
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* NOTE: 0x00 => no-autoconfig => unspecified
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*/
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static const u8 lowpan_unc_llconf[] = {0x0f, 0x28, 0x22, 0x20};
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/*
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* Uncompression of ctx-based:
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* 0 -> 0 bits from packet [unspecified / reserved]
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* 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet
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* 2 -> 8 bytes from prefix - zeroes + 2 from packet
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* 3 -> 8 bytes from prefix - infer 8 bytes from lladdr
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*/
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static const u8 lowpan_unc_ctxconf[] = {0x00, 0x88, 0x82, 0x80};
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/*
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* Uncompression of ctx-base
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* 0 -> 0 bits from packet
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* 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet
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* 2 -> 2 bytes from prefix - zeroes + 3 from packet
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* 3 -> 2 bytes from prefix - infer 1 bytes from lladdr
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*/
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static const u8 lowpan_unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
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/* Link local prefix */
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static const u8 lowpan_llprefix[] = {0xfe, 0x80};
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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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};
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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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struct lowpan_fragment {
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struct sk_buff *skb; /* skb to be assembled */
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spinlock_t lock; /* concurency lock */
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u16 length; /* length to be assemled */
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u32 bytes_rcv; /* bytes received */
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u16 tag; /* current fragment tag */
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struct timer_list timer; /* assembling timer */
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struct list_head list; /* fragments list */
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};
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static unsigned short fragment_tag;
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static LIST_HEAD(lowpan_fragments);
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spinlock_t flist_lock;
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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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/* list of all 6lowpan devices, uses for package delivering */
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/* print data in line */
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static inline void lowpan_raw_dump_inline(const char *caller, char *msg,
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unsigned char *buf, int len)
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{
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#ifdef DEBUG
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if (msg)
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pr_debug("(%s) %s: ", caller, msg);
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print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE,
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16, 1, buf, len, false);
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#endif /* DEBUG */
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}
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/*
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* print data in a table format:
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*
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* addr: xx xx xx xx xx xx
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* addr: xx xx xx xx xx xx
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* ...
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*/
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static inline void lowpan_raw_dump_table(const char *caller, char *msg,
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unsigned char *buf, int len)
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{
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#ifdef DEBUG
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if (msg)
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pr_debug("(%s) %s:\n", caller, msg);
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print_hex_dump(KERN_DEBUG, "\t", DUMP_PREFIX_OFFSET,
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16, 1, buf, len, false);
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#endif /* DEBUG */
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}
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static u8
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lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
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const unsigned char *lladdr)
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{
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u8 val = 0;
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if (is_addr_mac_addr_based(ipaddr, lladdr))
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val = 3; /* 0-bits */
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else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
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/* compress IID to 16 bits xxxx::XXXX */
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memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
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*hc06_ptr += 2;
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val = 2; /* 16-bits */
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} else {
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/* do not compress IID => xxxx::IID */
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memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
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*hc06_ptr += 8;
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val = 1; /* 64-bits */
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}
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return rol8(val, shift);
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}
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static void
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lowpan_uip_ds6_set_addr_iid(struct in6_addr *ipaddr, unsigned char *lladdr)
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{
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memcpy(&ipaddr->s6_addr[8], lladdr, IEEE802154_ADDR_LEN);
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/* second bit-flip (Universe/Local) is done according RFC2464 */
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ipaddr->s6_addr[8] ^= 0x02;
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}
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/*
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* Uncompress addresses based on a prefix and a postfix with zeroes in
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* between. If the postfix is zero in length it will use the link address
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* to configure the IP address (autoconf style).
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* pref_post_count takes a byte where the first nibble specify prefix count
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* and the second postfix count (NOTE: 15/0xf => 16 bytes copy).
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*/
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static int
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lowpan_uncompress_addr(struct sk_buff *skb, struct in6_addr *ipaddr,
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u8 const *prefix, u8 pref_post_count, unsigned char *lladdr)
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{
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u8 prefcount = pref_post_count >> 4;
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u8 postcount = pref_post_count & 0x0f;
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/* full nibble 15 => 16 */
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prefcount = (prefcount == 15 ? 16 : prefcount);
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postcount = (postcount == 15 ? 16 : postcount);
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if (lladdr)
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lowpan_raw_dump_inline(__func__, "linklocal address",
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lladdr, IEEE802154_ADDR_LEN);
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if (prefcount > 0)
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memcpy(ipaddr, prefix, prefcount);
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if (prefcount + postcount < 16)
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memset(&ipaddr->s6_addr[prefcount], 0,
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16 - (prefcount + postcount));
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if (postcount > 0) {
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memcpy(&ipaddr->s6_addr[16 - postcount], skb->data, postcount);
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skb_pull(skb, postcount);
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} else if (prefcount > 0) {
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if (lladdr == NULL)
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return -EINVAL;
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/* no IID based configuration if no prefix and no data */
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lowpan_uip_ds6_set_addr_iid(ipaddr, lladdr);
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}
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pr_debug("(%s): uncompressing %d + %d => ", __func__, prefcount,
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postcount);
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lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
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return 0;
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}
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static void
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lowpan_compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb)
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{
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struct udphdr *uh = udp_hdr(skb);
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pr_debug("(%s): UDP header compression\n", __func__);
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if (((uh->source & LOWPAN_NHC_UDP_4BIT_MASK) ==
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LOWPAN_NHC_UDP_4BIT_PORT) &&
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((uh->dest & LOWPAN_NHC_UDP_4BIT_MASK) ==
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LOWPAN_NHC_UDP_4BIT_PORT)) {
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pr_debug("(%s): both ports compression to 4 bits\n", __func__);
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_11;
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**(hc06_ptr + 1) = /* subtraction is faster */
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(u8)((uh->dest - LOWPAN_NHC_UDP_4BIT_PORT) +
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((uh->source & LOWPAN_NHC_UDP_4BIT_PORT) << 4));
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*hc06_ptr += 2;
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} else if ((uh->dest & LOWPAN_NHC_UDP_8BIT_MASK) ==
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LOWPAN_NHC_UDP_8BIT_PORT) {
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pr_debug("(%s): remove 8 bits of dest\n", __func__);
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_01;
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memcpy(*hc06_ptr + 1, &uh->source, 2);
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**(hc06_ptr + 3) = (u8)(uh->dest - LOWPAN_NHC_UDP_8BIT_PORT);
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*hc06_ptr += 4;
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} else if ((uh->source & LOWPAN_NHC_UDP_8BIT_MASK) ==
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LOWPAN_NHC_UDP_8BIT_PORT) {
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pr_debug("(%s): remove 8 bits of source\n", __func__);
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_10;
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memcpy(*hc06_ptr + 1, &uh->dest, 2);
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**(hc06_ptr + 3) = (u8)(uh->source - LOWPAN_NHC_UDP_8BIT_PORT);
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*hc06_ptr += 4;
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} else {
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pr_debug("(%s): can't compress header\n", __func__);
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**hc06_ptr = LOWPAN_NHC_UDP_CS_P_00;
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memcpy(*hc06_ptr + 1, &uh->source, 2);
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memcpy(*hc06_ptr + 3, &uh->dest, 2);
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*hc06_ptr += 5;
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}
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/* checksum is always inline */
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memcpy(*hc06_ptr, &uh->check, 2);
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*hc06_ptr += 2;
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}
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static u8 lowpan_fetch_skb_u8(struct sk_buff *skb)
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{
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u8 ret;
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ret = skb->data[0];
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skb_pull(skb, 1);
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return ret;
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}
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static u16 lowpan_fetch_skb_u16(struct sk_buff *skb)
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{
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u16 ret;
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BUG_ON(!pskb_may_pull(skb, 2));
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ret = skb->data[0] | (skb->data[1] << 8);
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skb_pull(skb, 2);
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return ret;
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}
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static int
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lowpan_uncompress_udp_header(struct sk_buff *skb)
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{
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struct udphdr *uh = udp_hdr(skb);
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u8 tmp;
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tmp = lowpan_fetch_skb_u8(skb);
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if ((tmp & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
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pr_debug("(%s): UDP header uncompression\n", __func__);
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switch (tmp & LOWPAN_NHC_UDP_CS_P_11) {
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case LOWPAN_NHC_UDP_CS_P_00:
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memcpy(&uh->source, &skb->data[0], 2);
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memcpy(&uh->dest, &skb->data[2], 2);
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skb_pull(skb, 4);
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break;
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case LOWPAN_NHC_UDP_CS_P_01:
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memcpy(&uh->source, &skb->data[0], 2);
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uh->dest =
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skb->data[2] + LOWPAN_NHC_UDP_8BIT_PORT;
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skb_pull(skb, 3);
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break;
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case LOWPAN_NHC_UDP_CS_P_10:
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uh->source = skb->data[0] + LOWPAN_NHC_UDP_8BIT_PORT;
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memcpy(&uh->dest, &skb->data[1], 2);
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skb_pull(skb, 3);
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break;
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case LOWPAN_NHC_UDP_CS_P_11:
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uh->source =
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LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] >> 4);
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uh->dest =
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LOWPAN_NHC_UDP_4BIT_PORT + (skb->data[0] & 0x0f);
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skb_pull(skb, 1);
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break;
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default:
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pr_debug("(%s) ERROR: unknown UDP format\n", __func__);
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goto err;
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break;
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}
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pr_debug("(%s): uncompressed UDP ports: src = %d, dst = %d\n",
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__func__, uh->source, uh->dest);
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/* copy checksum */
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memcpy(&uh->check, &skb->data[0], 2);
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skb_pull(skb, 2);
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} else {
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pr_debug("(%s): ERROR: unsupported NH format\n", __func__);
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goto err;
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}
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return 0;
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err:
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return -EINVAL;
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}
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static int lowpan_header_create(struct sk_buff *skb,
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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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u8 tmp, iphc0, iphc1, *hc06_ptr;
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struct ipv6hdr *hdr;
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const u8 *saddr = _saddr;
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const u8 *daddr = _daddr;
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u8 *head;
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struct ieee802154_addr sa, da;
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if (type != ETH_P_IPV6)
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return 0;
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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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head = kzalloc(100, GFP_KERNEL);
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if (head == NULL)
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return -ENOMEM;
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hdr = ipv6_hdr(skb);
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hc06_ptr = head + 2;
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pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n"
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"\tnexthdr = 0x%02x\n\thop_lim = %d\n", __func__,
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hdr->version, ntohs(hdr->payload_len), hdr->nexthdr,
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hdr->hop_limit);
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lowpan_raw_dump_table(__func__, "raw skb network header dump",
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skb_network_header(skb), sizeof(struct ipv6hdr));
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|
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if (!saddr)
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saddr = dev->dev_addr;
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lowpan_raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
|
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|
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/*
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* As we copy some bit-length fields, in the IPHC encoding bytes,
|
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* we sometimes use |=
|
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* If the field is 0, and the current bit value in memory is 1,
|
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* this does not work. We therefore reset the IPHC encoding here
|
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*/
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iphc0 = LOWPAN_DISPATCH_IPHC;
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iphc1 = 0;
|
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|
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/* TODO: context lookup */
|
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|
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lowpan_raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
|
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|
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/*
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* Traffic class, flow label
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* If flow label is 0, compress it. If traffic class is 0, compress it
|
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* We have to process both in the same time as the offset of traffic
|
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* class depends on the presence of version and flow label
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*/
|
|
|
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/* hc06 format of TC is ECN | DSCP , original one is DSCP | ECN */
|
|
tmp = (hdr->priority << 4) | (hdr->flow_lbl[0] >> 4);
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tmp = ((tmp & 0x03) << 6) | (tmp >> 2);
|
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|
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if (((hdr->flow_lbl[0] & 0x0F) == 0) &&
|
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(hdr->flow_lbl[1] == 0) && (hdr->flow_lbl[2] == 0)) {
|
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/* flow label can be compressed */
|
|
iphc0 |= LOWPAN_IPHC_FL_C;
|
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if ((hdr->priority == 0) &&
|
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((hdr->flow_lbl[0] & 0xF0) == 0)) {
|
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/* compress (elide) all */
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iphc0 |= LOWPAN_IPHC_TC_C;
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} else {
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/* compress only the flow label */
|
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*hc06_ptr = tmp;
|
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hc06_ptr += 1;
|
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}
|
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} else {
|
|
/* Flow label cannot be compressed */
|
|
if ((hdr->priority == 0) &&
|
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((hdr->flow_lbl[0] & 0xF0) == 0)) {
|
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/* compress only traffic class */
|
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iphc0 |= LOWPAN_IPHC_TC_C;
|
|
*hc06_ptr = (tmp & 0xc0) | (hdr->flow_lbl[0] & 0x0F);
|
|
memcpy(hc06_ptr + 1, &hdr->flow_lbl[1], 2);
|
|
hc06_ptr += 3;
|
|
} else {
|
|
/* compress nothing */
|
|
memcpy(hc06_ptr, &hdr, 4);
|
|
/* replace the top byte with new ECN | DSCP format */
|
|
*hc06_ptr = tmp;
|
|
hc06_ptr += 4;
|
|
}
|
|
}
|
|
|
|
/* NOTE: payload length is always compressed */
|
|
|
|
/* Next Header is compress if UDP */
|
|
if (hdr->nexthdr == UIP_PROTO_UDP)
|
|
iphc0 |= LOWPAN_IPHC_NH_C;
|
|
|
|
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
|
|
*hc06_ptr = hdr->nexthdr;
|
|
hc06_ptr += 1;
|
|
}
|
|
|
|
/*
|
|
* Hop limit
|
|
* if 1: compress, encoding is 01
|
|
* if 64: compress, encoding is 10
|
|
* if 255: compress, encoding is 11
|
|
* else do not compress
|
|
*/
|
|
switch (hdr->hop_limit) {
|
|
case 1:
|
|
iphc0 |= LOWPAN_IPHC_TTL_1;
|
|
break;
|
|
case 64:
|
|
iphc0 |= LOWPAN_IPHC_TTL_64;
|
|
break;
|
|
case 255:
|
|
iphc0 |= LOWPAN_IPHC_TTL_255;
|
|
break;
|
|
default:
|
|
*hc06_ptr = hdr->hop_limit;
|
|
break;
|
|
}
|
|
|
|
/* source address compression */
|
|
if (is_addr_unspecified(&hdr->saddr)) {
|
|
pr_debug("(%s): source address is unspecified, setting SAC\n",
|
|
__func__);
|
|
iphc1 |= LOWPAN_IPHC_SAC;
|
|
/* TODO: context lookup */
|
|
} else if (is_addr_link_local(&hdr->saddr)) {
|
|
pr_debug("(%s): source address is link-local\n", __func__);
|
|
iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
|
|
LOWPAN_IPHC_SAM_BIT, &hdr->saddr, saddr);
|
|
} else {
|
|
pr_debug("(%s): send the full source address\n", __func__);
|
|
memcpy(hc06_ptr, &hdr->saddr.s6_addr16[0], 16);
|
|
hc06_ptr += 16;
|
|
}
|
|
|
|
/* destination address compression */
|
|
if (is_addr_mcast(&hdr->daddr)) {
|
|
pr_debug("(%s): destination address is multicast", __func__);
|
|
iphc1 |= LOWPAN_IPHC_M;
|
|
if (lowpan_is_mcast_addr_compressable8(&hdr->daddr)) {
|
|
pr_debug("compressed to 1 octet\n");
|
|
iphc1 |= LOWPAN_IPHC_DAM_11;
|
|
/* use last byte */
|
|
*hc06_ptr = hdr->daddr.s6_addr[15];
|
|
hc06_ptr += 1;
|
|
} else if (lowpan_is_mcast_addr_compressable32(&hdr->daddr)) {
|
|
pr_debug("compressed to 4 octets\n");
|
|
iphc1 |= LOWPAN_IPHC_DAM_10;
|
|
/* second byte + the last three */
|
|
*hc06_ptr = hdr->daddr.s6_addr[1];
|
|
memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[13], 3);
|
|
hc06_ptr += 4;
|
|
} else if (lowpan_is_mcast_addr_compressable48(&hdr->daddr)) {
|
|
pr_debug("compressed to 6 octets\n");
|
|
iphc1 |= LOWPAN_IPHC_DAM_01;
|
|
/* second byte + the last five */
|
|
*hc06_ptr = hdr->daddr.s6_addr[1];
|
|
memcpy(hc06_ptr + 1, &hdr->daddr.s6_addr[11], 5);
|
|
hc06_ptr += 6;
|
|
} else {
|
|
pr_debug("using full address\n");
|
|
iphc1 |= LOWPAN_IPHC_DAM_00;
|
|
memcpy(hc06_ptr, &hdr->daddr.s6_addr[0], 16);
|
|
hc06_ptr += 16;
|
|
}
|
|
} else {
|
|
pr_debug("(%s): destination address is unicast: ", __func__);
|
|
/* TODO: context lookup */
|
|
if (is_addr_link_local(&hdr->daddr)) {
|
|
pr_debug("destination address is link-local\n");
|
|
iphc1 |= lowpan_compress_addr_64(&hc06_ptr,
|
|
LOWPAN_IPHC_DAM_BIT, &hdr->daddr, daddr);
|
|
} else {
|
|
pr_debug("using full address\n");
|
|
memcpy(hc06_ptr, &hdr->daddr.s6_addr16[0], 16);
|
|
hc06_ptr += 16;
|
|
}
|
|
}
|
|
|
|
/* UDP header compression */
|
|
if (hdr->nexthdr == UIP_PROTO_UDP)
|
|
lowpan_compress_udp_header(&hc06_ptr, skb);
|
|
|
|
head[0] = iphc0;
|
|
head[1] = iphc1;
|
|
|
|
skb_pull(skb, sizeof(struct ipv6hdr));
|
|
memcpy(skb_push(skb, hc06_ptr - head), head, hc06_ptr - head);
|
|
|
|
kfree(head);
|
|
|
|
lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
|
|
skb->len);
|
|
|
|
/*
|
|
* NOTE1: I'm still unsure about the fact that compression and WPAN
|
|
* header are created here and not later in the xmit. So wait for
|
|
* an opinion of net maintainers.
|
|
*/
|
|
/*
|
|
* NOTE2: to be absolutely correct, we must derive PANid information
|
|
* from MAC subif of the 'dev' and 'real_dev' network devices, but
|
|
* this isn't implemented in mainline yet, so currently we assign 0xff
|
|
*/
|
|
{
|
|
/* prepare wpan address data */
|
|
sa.addr_type = IEEE802154_ADDR_LONG;
|
|
sa.pan_id = 0xff;
|
|
|
|
da.addr_type = IEEE802154_ADDR_LONG;
|
|
da.pan_id = 0xff;
|
|
|
|
memcpy(&(da.hwaddr), daddr, 8);
|
|
memcpy(&(sa.hwaddr), saddr, 8);
|
|
|
|
mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
|
|
|
|
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
|
|
type, (void *)&da, (void *)&sa, skb->len);
|
|
}
|
|
}
|
|
|
|
static int lowpan_skb_deliver(struct sk_buff *skb, struct ipv6hdr *hdr)
|
|
{
|
|
struct sk_buff *new;
|
|
struct lowpan_dev_record *entry;
|
|
int stat = NET_RX_SUCCESS;
|
|
|
|
new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
|
|
GFP_ATOMIC);
|
|
kfree_skb(skb);
|
|
|
|
if (!new)
|
|
return -ENOMEM;
|
|
|
|
skb_push(new, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(new);
|
|
skb_copy_to_linear_data(new, hdr, sizeof(struct ipv6hdr));
|
|
|
|
new->protocol = htons(ETH_P_IPV6);
|
|
new->pkt_type = PACKET_HOST;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(entry, &lowpan_devices, list)
|
|
if (lowpan_dev_info(entry->ldev)->real_dev == new->dev) {
|
|
skb = skb_copy(new, GFP_ATOMIC);
|
|
if (!skb) {
|
|
stat = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
skb->dev = entry->ldev;
|
|
stat = netif_rx(skb);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
kfree_skb(new);
|
|
|
|
return stat;
|
|
}
|
|
|
|
static void lowpan_fragment_timer_expired(unsigned long entry_addr)
|
|
{
|
|
struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
|
|
|
|
pr_debug("%s: timer expired for frame with tag %d\n", __func__,
|
|
entry->tag);
|
|
|
|
spin_lock(&flist_lock);
|
|
list_del(&entry->list);
|
|
spin_unlock(&flist_lock);
|
|
|
|
dev_kfree_skb(entry->skb);
|
|
kfree(entry);
|
|
}
|
|
|
|
static struct lowpan_fragment *
|
|
lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag)
|
|
{
|
|
struct lowpan_fragment *frame;
|
|
|
|
frame = kzalloc(sizeof(struct lowpan_fragment),
|
|
GFP_ATOMIC);
|
|
if (!frame)
|
|
goto frame_err;
|
|
|
|
INIT_LIST_HEAD(&frame->list);
|
|
|
|
frame->length = (iphc0 & 7) | (len << 3);
|
|
frame->tag = tag;
|
|
|
|
/* allocate buffer for frame assembling */
|
|
frame->skb = alloc_skb(frame->length +
|
|
sizeof(struct ipv6hdr), GFP_ATOMIC);
|
|
|
|
if (!frame->skb)
|
|
goto skb_err;
|
|
|
|
frame->skb->priority = skb->priority;
|
|
frame->skb->dev = skb->dev;
|
|
|
|
/* reserve headroom for uncompressed ipv6 header */
|
|
skb_reserve(frame->skb, sizeof(struct ipv6hdr));
|
|
skb_put(frame->skb, frame->length);
|
|
|
|
init_timer(&frame->timer);
|
|
/* time out is the same as for ipv6 - 60 sec */
|
|
frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
|
|
frame->timer.data = (unsigned long)frame;
|
|
frame->timer.function = lowpan_fragment_timer_expired;
|
|
|
|
add_timer(&frame->timer);
|
|
|
|
list_add_tail(&frame->list, &lowpan_fragments);
|
|
|
|
return frame;
|
|
|
|
skb_err:
|
|
kfree(frame);
|
|
frame_err:
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
lowpan_process_data(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr hdr;
|
|
u8 tmp, iphc0, iphc1, num_context = 0;
|
|
u8 *_saddr, *_daddr;
|
|
int err;
|
|
|
|
lowpan_raw_dump_table(__func__, "raw skb data dump", skb->data,
|
|
skb->len);
|
|
/* at least two bytes will be used for the encoding */
|
|
if (skb->len < 2)
|
|
goto drop;
|
|
iphc0 = lowpan_fetch_skb_u8(skb);
|
|
|
|
/* fragments assembling */
|
|
switch (iphc0 & LOWPAN_DISPATCH_MASK) {
|
|
case LOWPAN_DISPATCH_FRAG1:
|
|
case LOWPAN_DISPATCH_FRAGN:
|
|
{
|
|
struct lowpan_fragment *frame;
|
|
u8 len, offset;
|
|
u16 tag;
|
|
bool found = false;
|
|
|
|
len = lowpan_fetch_skb_u8(skb); /* frame length */
|
|
tag = lowpan_fetch_skb_u16(skb);
|
|
|
|
/*
|
|
* check if frame assembling with the same tag is
|
|
* already in progress
|
|
*/
|
|
spin_lock(&flist_lock);
|
|
|
|
list_for_each_entry(frame, &lowpan_fragments, list)
|
|
if (frame->tag == tag) {
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
/* alloc new frame structure */
|
|
if (!found) {
|
|
frame = lowpan_alloc_new_frame(skb, iphc0, len, tag);
|
|
if (!frame)
|
|
goto unlock_and_drop;
|
|
}
|
|
|
|
if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)
|
|
goto unlock_and_drop;
|
|
|
|
offset = lowpan_fetch_skb_u8(skb); /* fetch offset */
|
|
|
|
/* if payload fits buffer, copy it */
|
|
if (likely((offset * 8 + skb->len) <= frame->length))
|
|
skb_copy_to_linear_data_offset(frame->skb, offset * 8,
|
|
skb->data, skb->len);
|
|
else
|
|
goto unlock_and_drop;
|
|
|
|
frame->bytes_rcv += skb->len;
|
|
|
|
/* frame assembling complete */
|
|
if ((frame->bytes_rcv == frame->length) &&
|
|
frame->timer.expires > jiffies) {
|
|
/* if timer haven't expired - first of all delete it */
|
|
del_timer(&frame->timer);
|
|
list_del(&frame->list);
|
|
spin_unlock(&flist_lock);
|
|
|
|
dev_kfree_skb(skb);
|
|
skb = frame->skb;
|
|
kfree(frame);
|
|
iphc0 = lowpan_fetch_skb_u8(skb);
|
|
break;
|
|
}
|
|
spin_unlock(&flist_lock);
|
|
|
|
return kfree_skb(skb), 0;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
iphc1 = lowpan_fetch_skb_u8(skb);
|
|
|
|
_saddr = mac_cb(skb)->sa.hwaddr;
|
|
_daddr = mac_cb(skb)->da.hwaddr;
|
|
|
|
pr_debug("(%s): iphc0 = %02x, iphc1 = %02x\n", __func__, iphc0, iphc1);
|
|
|
|
/* another if the CID flag is set */
|
|
if (iphc1 & LOWPAN_IPHC_CID) {
|
|
pr_debug("(%s): CID flag is set, increase header with one\n",
|
|
__func__);
|
|
if (!skb->len)
|
|
goto drop;
|
|
num_context = lowpan_fetch_skb_u8(skb);
|
|
}
|
|
|
|
hdr.version = 6;
|
|
|
|
/* Traffic Class and Flow Label */
|
|
switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
|
|
/*
|
|
* Traffic Class and FLow Label carried in-line
|
|
* ECN + DSCP + 4-bit Pad + Flow Label (4 bytes)
|
|
*/
|
|
case 0: /* 00b */
|
|
if (!skb->len)
|
|
goto drop;
|
|
tmp = lowpan_fetch_skb_u8(skb);
|
|
memcpy(&hdr.flow_lbl, &skb->data[0], 3);
|
|
skb_pull(skb, 3);
|
|
hdr.priority = ((tmp >> 2) & 0x0f);
|
|
hdr.flow_lbl[0] = ((tmp >> 2) & 0x30) | (tmp << 6) |
|
|
(hdr.flow_lbl[0] & 0x0f);
|
|
break;
|
|
/*
|
|
* Traffic class carried in-line
|
|
* ECN + DSCP (1 byte), Flow Label is elided
|
|
*/
|
|
case 1: /* 10b */
|
|
if (!skb->len)
|
|
goto drop;
|
|
tmp = lowpan_fetch_skb_u8(skb);
|
|
hdr.priority = ((tmp >> 2) & 0x0f);
|
|
hdr.flow_lbl[0] = ((tmp << 6) & 0xC0) | ((tmp >> 2) & 0x30);
|
|
hdr.flow_lbl[1] = 0;
|
|
hdr.flow_lbl[2] = 0;
|
|
break;
|
|
/*
|
|
* Flow Label carried in-line
|
|
* ECN + 2-bit Pad + Flow Label (3 bytes), DSCP is elided
|
|
*/
|
|
case 2: /* 01b */
|
|
if (!skb->len)
|
|
goto drop;
|
|
tmp = lowpan_fetch_skb_u8(skb);
|
|
hdr.flow_lbl[0] = (skb->data[0] & 0x0F) | ((tmp >> 2) & 0x30);
|
|
memcpy(&hdr.flow_lbl[1], &skb->data[0], 2);
|
|
skb_pull(skb, 2);
|
|
break;
|
|
/* Traffic Class and Flow Label are elided */
|
|
case 3: /* 11b */
|
|
hdr.priority = 0;
|
|
hdr.flow_lbl[0] = 0;
|
|
hdr.flow_lbl[1] = 0;
|
|
hdr.flow_lbl[2] = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Next Header */
|
|
if ((iphc0 & LOWPAN_IPHC_NH_C) == 0) {
|
|
/* Next header is carried inline */
|
|
if (!skb->len)
|
|
goto drop;
|
|
hdr.nexthdr = lowpan_fetch_skb_u8(skb);
|
|
pr_debug("(%s): NH flag is set, next header is carried "
|
|
"inline: %02x\n", __func__, hdr.nexthdr);
|
|
}
|
|
|
|
/* Hop Limit */
|
|
if ((iphc0 & 0x03) != LOWPAN_IPHC_TTL_I)
|
|
hdr.hop_limit = lowpan_ttl_values[iphc0 & 0x03];
|
|
else {
|
|
if (!skb->len)
|
|
goto drop;
|
|
hdr.hop_limit = lowpan_fetch_skb_u8(skb);
|
|
}
|
|
|
|
/* Extract SAM to the tmp variable */
|
|
tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
|
|
|
|
/* Source address uncompression */
|
|
pr_debug("(%s): source address stateless compression\n", __func__);
|
|
err = lowpan_uncompress_addr(skb, &hdr.saddr, lowpan_llprefix,
|
|
lowpan_unc_llconf[tmp], skb->data);
|
|
if (err)
|
|
goto drop;
|
|
|
|
/* Extract DAM to the tmp variable */
|
|
tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
|
|
|
|
/* check for Multicast Compression */
|
|
if (iphc1 & LOWPAN_IPHC_M) {
|
|
if (iphc1 & LOWPAN_IPHC_DAC) {
|
|
pr_debug("(%s): destination address context-based "
|
|
"multicast compression\n", __func__);
|
|
/* TODO: implement this */
|
|
} else {
|
|
u8 prefix[] = {0xff, 0x02};
|
|
|
|
pr_debug("(%s): destination address non-context-based"
|
|
" multicast compression\n", __func__);
|
|
if (0 < tmp && tmp < 3) {
|
|
if (!skb->len)
|
|
goto drop;
|
|
else
|
|
prefix[1] = lowpan_fetch_skb_u8(skb);
|
|
}
|
|
|
|
err = lowpan_uncompress_addr(skb, &hdr.daddr, prefix,
|
|
lowpan_unc_mxconf[tmp], NULL);
|
|
if (err)
|
|
goto drop;
|
|
}
|
|
} else {
|
|
pr_debug("(%s): destination address stateless compression\n",
|
|
__func__);
|
|
err = lowpan_uncompress_addr(skb, &hdr.daddr, lowpan_llprefix,
|
|
lowpan_unc_llconf[tmp], skb->data);
|
|
if (err)
|
|
goto drop;
|
|
}
|
|
|
|
/* UDP data uncompression */
|
|
if (iphc0 & LOWPAN_IPHC_NH_C)
|
|
if (lowpan_uncompress_udp_header(skb))
|
|
goto drop;
|
|
|
|
/* Not fragmented package */
|
|
hdr.payload_len = htons(skb->len);
|
|
|
|
pr_debug("(%s): skb headroom size = %d, data length = %d\n", __func__,
|
|
skb_headroom(skb), skb->len);
|
|
|
|
pr_debug("(%s): IPv6 header dump:\n\tversion = %d\n\tlength = %d\n\t"
|
|
"nexthdr = 0x%02x\n\thop_lim = %d\n", __func__, hdr.version,
|
|
ntohs(hdr.payload_len), hdr.nexthdr, hdr.hop_limit);
|
|
|
|
lowpan_raw_dump_table(__func__, "raw header dump", (u8 *)&hdr,
|
|
sizeof(hdr));
|
|
return lowpan_skb_deliver(skb, &hdr);
|
|
|
|
unlock_and_drop:
|
|
spin_unlock(&flist_lock);
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int lowpan_get_mac_header_length(struct sk_buff *skb)
|
|
{
|
|
/*
|
|
* Currently long addressing mode is supported only, so the overall
|
|
* header size is 21:
|
|
* FC SeqNum DPAN DA SA Sec
|
|
* 2 + 1 + 2 + 8 + 8 + 0 = 21
|
|
*/
|
|
return 21;
|
|
}
|
|
|
|
static int
|
|
lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
|
|
int mlen, int plen, int offset)
|
|
{
|
|
struct sk_buff *frag;
|
|
int hlen, ret;
|
|
|
|
/* if payload length is zero, therefore it's a first fragment */
|
|
hlen = (plen == 0 ? LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE);
|
|
|
|
lowpan_raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
|
|
|
|
frag = dev_alloc_skb(hlen + mlen + plen + IEEE802154_MFR_SIZE);
|
|
if (!frag)
|
|
return -ENOMEM;
|
|
|
|
frag->priority = skb->priority;
|
|
frag->dev = skb->dev;
|
|
|
|
/* copy header, MFR and payload */
|
|
memcpy(skb_put(frag, mlen), skb->data, mlen);
|
|
memcpy(skb_put(frag, hlen), head, hlen);
|
|
|
|
if (plen)
|
|
skb_copy_from_linear_data_offset(skb, offset + mlen,
|
|
skb_put(frag, plen), plen);
|
|
|
|
lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
|
|
frag->len);
|
|
|
|
ret = dev_queue_xmit(frag);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
lowpan_skb_fragmentation(struct sk_buff *skb)
|
|
{
|
|
int err, header_length, payload_length, tag, offset = 0;
|
|
u8 head[5];
|
|
|
|
header_length = lowpan_get_mac_header_length(skb);
|
|
payload_length = skb->len - header_length;
|
|
tag = fragment_tag++;
|
|
|
|
/* first fragment header */
|
|
head[0] = LOWPAN_DISPATCH_FRAG1 | (payload_length & 0x7);
|
|
head[1] = (payload_length >> 3) & 0xff;
|
|
head[2] = tag & 0xff;
|
|
head[3] = tag >> 8;
|
|
|
|
err = lowpan_fragment_xmit(skb, head, header_length, 0, 0);
|
|
|
|
/* next fragment header */
|
|
head[0] &= ~LOWPAN_DISPATCH_FRAG1;
|
|
head[0] |= LOWPAN_DISPATCH_FRAGN;
|
|
|
|
while ((payload_length - offset > 0) && (err >= 0)) {
|
|
int len = LOWPAN_FRAG_SIZE;
|
|
|
|
head[4] = offset / 8;
|
|
|
|
if (payload_length - offset < len)
|
|
len = payload_length - offset;
|
|
|
|
err = lowpan_fragment_xmit(skb, head, header_length,
|
|
len, offset);
|
|
offset += len;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
int err = -1;
|
|
|
|
pr_debug("(%s): package xmit\n", __func__);
|
|
|
|
skb->dev = lowpan_dev_info(dev)->real_dev;
|
|
if (skb->dev == NULL) {
|
|
pr_debug("(%s) ERROR: no real wpan device found\n", __func__);
|
|
goto error;
|
|
}
|
|
|
|
if (skb->len <= IEEE802154_MTU) {
|
|
err = dev_queue_xmit(skb);
|
|
goto out;
|
|
}
|
|
|
|
pr_debug("(%s): frame is too big, fragmentation is needed\n",
|
|
__func__);
|
|
err = lowpan_skb_fragmentation(skb);
|
|
error:
|
|
dev_kfree_skb(skb);
|
|
out:
|
|
if (err < 0)
|
|
pr_debug("(%s): ERROR: xmit failed\n", __func__);
|
|
|
|
return (err < 0 ? NETDEV_TX_BUSY : NETDEV_TX_OK);
|
|
}
|
|
|
|
static void lowpan_dev_free(struct net_device *dev)
|
|
{
|
|
dev_put(lowpan_dev_info(dev)->real_dev);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
static struct wpan_phy *lowpan_get_phy(const struct net_device *dev)
|
|
{
|
|
struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
|
|
return ieee802154_mlme_ops(real_dev)->get_phy(real_dev);
|
|
}
|
|
|
|
static u16 lowpan_get_pan_id(const struct net_device *dev)
|
|
{
|
|
struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
|
|
return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
|
|
}
|
|
|
|
static u16 lowpan_get_short_addr(const struct net_device *dev)
|
|
{
|
|
struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
|
|
return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
|
|
}
|
|
|
|
static struct header_ops lowpan_header_ops = {
|
|
.create = lowpan_header_create,
|
|
};
|
|
|
|
static const struct net_device_ops lowpan_netdev_ops = {
|
|
.ndo_start_xmit = lowpan_xmit,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
};
|
|
|
|
static struct ieee802154_mlme_ops lowpan_mlme = {
|
|
.get_pan_id = lowpan_get_pan_id,
|
|
.get_phy = lowpan_get_phy,
|
|
.get_short_addr = lowpan_get_short_addr,
|
|
};
|
|
|
|
static void lowpan_setup(struct net_device *dev)
|
|
{
|
|
pr_debug("(%s)\n", __func__);
|
|
|
|
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 = 1281;
|
|
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 = lowpan_dev_free;
|
|
}
|
|
|
|
static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
pr_debug("(%s)\n", __func__);
|
|
|
|
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)
|
|
{
|
|
if (!netif_running(dev))
|
|
goto drop;
|
|
|
|
if (dev->type != ARPHRD_IEEE802154)
|
|
goto drop;
|
|
|
|
/* check that it's our buffer */
|
|
switch (skb->data[0] & 0xe0) {
|
|
case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
|
|
case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
|
|
case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
|
|
lowpan_process_data(skb);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NET_RX_SUCCESS;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
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("(%s)\n", __func__);
|
|
|
|
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;
|
|
|
|
lowpan_dev_info(dev)->real_dev = real_dev;
|
|
mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
|
|
|
|
entry = kzalloc(sizeof(struct lowpan_dev_record), GFP_KERNEL);
|
|
if (!entry) {
|
|
dev_put(real_dev);
|
|
lowpan_dev_info(dev)->real_dev = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
entry->ldev = dev;
|
|
|
|
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);
|
|
|
|
spin_lock_init(&flist_lock);
|
|
|
|
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;
|
|
struct lowpan_fragment *frame, *tframe;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
spin_lock(&flist_lock);
|
|
list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
|
|
del_timer(&frame->timer);
|
|
list_del(&frame->list);
|
|
dev_kfree_skb(frame->skb);
|
|
kfree(frame);
|
|
}
|
|
spin_unlock(&flist_lock);
|
|
|
|
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 __init lowpan_netlink_fini(void)
|
|
{
|
|
rtnl_link_unregister(&lowpan_link_ops);
|
|
}
|
|
|
|
static struct packet_type lowpan_packet_type = {
|
|
.type = __constant_htons(ETH_P_IEEE802154),
|
|
.func = lowpan_rcv,
|
|
};
|
|
|
|
static int __init lowpan_init_module(void)
|
|
{
|
|
int err = 0;
|
|
|
|
pr_debug("(%s)\n", __func__);
|
|
|
|
err = lowpan_netlink_init();
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
dev_add_pack(&lowpan_packet_type);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit lowpan_cleanup_module(void)
|
|
{
|
|
pr_debug("(%s)\n", __func__);
|
|
|
|
lowpan_netlink_fini();
|
|
|
|
dev_remove_pack(&lowpan_packet_type);
|
|
}
|
|
|
|
module_init(lowpan_init_module);
|
|
module_exit(lowpan_cleanup_module);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_RTNL_LINK("lowpan");
|