/*
* Copyright 2011, Siemens AG
* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
/*
* Based on patches from Jon Smirl <jonsmirl@gmail.com>
* Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Jon's code is based on 6lowpan implementation for Contiki which is:
* Copyright (c) 2008, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <linux/bitops.h>
#include <linux/if_arp.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netdevice.h>
#include <net/af_ieee802154.h>
#include <net/ieee802154.h>
#include <net/ieee802154_netdev.h>
#include <net/ipv6.h>
#include "6lowpan.h"
static LIST_HEAD(lowpan_devices);
/* private device info */
struct lowpan_dev_info {
struct net_device *real_dev; /* real WPAN device ptr */
struct mutex dev_list_mtx; /* mutex for list ops */
unsigned short fragment_tag;
};
struct lowpan_dev_record {
struct net_device *ldev;
struct list_head list;
};
struct lowpan_fragment {
struct sk_buff *skb; /* skb to be assembled */
u16 length; /* length to be assemled */
u32 bytes_rcv; /* bytes received */
u16 tag; /* current fragment tag */
struct timer_list timer; /* assembling timer */
struct list_head list; /* fragments list */
};
static LIST_HEAD(lowpan_fragments);
static DEFINE_SPINLOCK(flist_lock);
static inline struct
lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
{
return netdev_priv(dev);
}
static inline void lowpan_address_flip(u8 *src, u8 *dest)
{
int i;
for (i = 0; i < IEEE802154_ADDR_LEN; i++)
(dest)[IEEE802154_ADDR_LEN - i - 1] = (src)[i];
}
static int lowpan_header_create(struct sk_buff *skb,
struct net_device *dev,
unsigned short type, const void *_daddr,
const void *_saddr, unsigned int len)
{
const u8 *saddr = _saddr;
const u8 *daddr = _daddr;
struct ieee802154_addr sa, da;
/* TODO:
* if this package isn't ipv6 one, where should it be routed?
*/
if (type != ETH_P_IPV6)
return 0;
if (!saddr)
saddr = dev->dev_addr;
raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
lowpan_header_compress(skb, dev, type, daddr, saddr, 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
*/
mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;
mac_cb(skb)->seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
/* prepare wpan address data */
sa.addr_type = IEEE802154_ADDR_LONG;
sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
memcpy(&(sa.hwaddr), saddr, 8);
/* intra-PAN communications */
da.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
/*
* if the destination address is the broadcast address, use the
* corresponding short address
*/
if (lowpan_is_addr_broadcast(daddr)) {
da.addr_type = IEEE802154_ADDR_SHORT;
da.short_addr = IEEE802154_ADDR_BROADCAST;
} else {
da.addr_type = IEEE802154_ADDR_LONG;
memcpy(&(da.hwaddr), daddr, IEEE802154_ADDR_LEN);
/* request acknowledgment */
mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
}
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
type, (void *)&da, (void *)&sa, skb->len);
}
static int lowpan_give_skb_to_devices(struct sk_buff *skb,
struct net_device *dev)
{
struct lowpan_dev_record *entry;
struct sk_buff *skb_cp;
int stat = NET_RX_SUCCESS;
rcu_read_lock();
list_for_each_entry_rcu(entry, &lowpan_devices, list)
if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
skb_cp = skb_copy(skb, GFP_ATOMIC);
if (!skb_cp) {
stat = -ENOMEM;
break;
}
skb_cp->dev = entry->ldev;
stat = netif_rx(skb_cp);
}
rcu_read_unlock();
return stat;
}
static void lowpan_fragment_timer_expired(unsigned long entry_addr)
{
struct lowpan_fragment *entry = (struct lowpan_fragment *)entry_addr;
pr_debug("timer expired for frame with tag %d\n", entry->tag);
list_del(&entry->list);
dev_kfree_skb(entry->skb);
kfree(entry);
}
static struct lowpan_fragment *
lowpan_alloc_new_frame(struct sk_buff *skb, u16 len, u16 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 = len;
frame->tag = tag;
/* allocate buffer for frame assembling */
frame->skb = netdev_alloc_skb_ip_align(skb->dev, frame->length +
sizeof(struct ipv6hdr));
if (!frame->skb)
goto skb_err;
frame->skb->priority = skb->priority;
/* reserve headroom for uncompressed ipv6 header */
skb_reserve(frame->skb, sizeof(struct ipv6hdr));
skb_put(frame->skb, frame->length);
/* copy the first control block to keep a
* trace of the link-layer addresses in case
* of a link-local compressed address
*/
memcpy(frame->skb->cb, skb->cb, sizeof(skb->cb));
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 process_data(struct sk_buff *skb)
{
u8 iphc0, iphc1;
const struct ieee802154_addr *_saddr, *_daddr;
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;
if (lowpan_fetch_skb_u8(skb, &iphc0))
goto drop;
/* fragments assembling */
switch (iphc0 & LOWPAN_DISPATCH_MASK) {
case LOWPAN_DISPATCH_FRAG1:
case LOWPAN_DISPATCH_FRAGN:
{
struct lowpan_fragment *frame;
/* slen stores the rightmost 8 bits of the 11 bits length */
u8 slen, offset = 0;
u16 len, tag;
bool found = false;
if (lowpan_fetch_skb_u8(skb, &slen) || /* frame length */
lowpan_fetch_skb_u16(skb, &tag)) /* fragment tag */
goto drop;
/* adds the 3 MSB to the 8 LSB to retrieve the 11 bits length */
len = ((iphc0 & 7) << 8) | slen;
if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1) {
pr_debug("%s received a FRAG1 packet (tag: %d, "
"size of the entire IP packet: %d)",
__func__, tag, len);
} else { /* FRAGN */
if (lowpan_fetch_skb_u8(skb, &offset))
goto unlock_and_drop;
pr_debug("%s received a FRAGN packet (tag: %d, "
"size of the entire IP packet: %d, "
"offset: %d)", __func__, tag, len, offset * 8);
}
/*
* check if frame assembling with the same tag is
* already in progress
*/
spin_lock_bh(&flist_lock);
list_for_each_entry(frame, &lowpan_fragments, list)
if (frame->tag == tag) {
found = true;
break;
}
/* alloc new frame structure */
if (!found) {
pr_debug("%s first fragment received for tag %d, "
"begin packet reassembly", __func__, tag);
frame = lowpan_alloc_new_frame(skb, len, tag);
if (!frame)
goto unlock_and_drop;
}
/* 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_sync(&frame->timer);
list_del(&frame->list);
spin_unlock_bh(&flist_lock);
pr_debug("%s successfully reassembled fragment "
"(tag %d)", __func__, tag);
dev_kfree_skb(skb);
skb = frame->skb;
kfree(frame);
if (lowpan_fetch_skb_u8(skb, &iphc0))
goto drop;
break;
}
spin_unlock_bh(&flist_lock);
return kfree_skb(skb), 0;
}
default:
break;
}
if (lowpan_fetch_skb_u8(skb, &iphc1))
goto drop;
_saddr = &mac_cb(skb)->sa;
_daddr = &mac_cb(skb)->da;
return lowpan_process_data(skb, skb->dev, (u8 *)_saddr->hwaddr,
_saddr->addr_type, IEEE802154_ADDR_LEN,
(u8 *)_daddr->hwaddr, _daddr->addr_type,
IEEE802154_ADDR_LEN, iphc0, iphc1,
lowpan_give_skb_to_devices);
unlock_and_drop:
spin_unlock_bh(&flist_lock);
drop:
kfree_skb(skb);
return -EINVAL;
}
static int lowpan_set_address(struct net_device *dev, void *p)
{
struct sockaddr *sa = p;
if (netif_running(dev))
return -EBUSY;
/* TODO: validate addr */
memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
return 0;
}
static int
lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
int mlen, int plen, int offset, int type)
{
struct sk_buff *frag;
int hlen;
hlen = (type == LOWPAN_DISPATCH_FRAG1) ?
LOWPAN_FRAG1_HEAD_SIZE : LOWPAN_FRAGN_HEAD_SIZE;
raw_dump_inline(__func__, "6lowpan fragment header", head, hlen);
frag = netdev_alloc_skb(skb->dev,
hlen + mlen + plen + IEEE802154_MFR_SIZE);
if (!frag)
return -ENOMEM;
frag->priority = skb->priority;
/* copy header, MFR and payload */
skb_put(frag, mlen);
skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen);
skb_put(frag, hlen);
skb_copy_to_linear_data_offset(frag, mlen, head, hlen);
skb_put(frag, plen);
skb_copy_to_linear_data_offset(frag, mlen + hlen,
skb_network_header(skb) + offset, plen);
raw_dump_table(__func__, " raw fragment dump", frag->data, frag->len);
return dev_queue_xmit(frag);
}
static int
lowpan_skb_fragmentation(struct sk_buff *skb, struct net_device *dev)
{
int err, header_length, payload_length, tag, offset = 0;
u8 head[5];
header_length = skb->mac_len;
payload_length = skb->len - header_length;
tag = lowpan_dev_info(dev)->fragment_tag++;
/* first fragment header */
head[0] = LOWPAN_DISPATCH_FRAG1 | ((payload_length >> 8) & 0x7);
head[1] = payload_length & 0xff;
head[2] = tag >> 8;
head[3] = tag & 0xff;
err = lowpan_fragment_xmit(skb, head, header_length, LOWPAN_FRAG_SIZE,
0, LOWPAN_DISPATCH_FRAG1);
if (err) {
pr_debug("%s unable to send FRAG1 packet (tag: %d)",
__func__, tag);
goto exit;
}
offset = LOWPAN_FRAG_SIZE;
/* next fragment header */
head[0] &= ~LOWPAN_DISPATCH_FRAG1;
head[0] |= LOWPAN_DISPATCH_FRAGN;
while (payload_length - offset > 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, LOWPAN_DISPATCH_FRAGN);
if (err) {
pr_debug("%s unable to send a subsequent FRAGN packet "
"(tag: %d, offset: %d", __func__, tag, offset);
goto exit;
}
offset += len;
}
exit:
return err;
}
static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
{
int err = -1;
pr_debug("package xmit\n");
skb->dev = lowpan_dev_info(dev)->real_dev;
if (skb->dev == NULL) {
pr_debug("ERROR: no real wpan device found\n");
goto error;
}
/* Send directly if less than the MTU minus the 2 checksum bytes. */
if (skb->len <= IEEE802154_MTU - IEEE802154_MFR_SIZE) {
err = dev_queue_xmit(skb);
goto out;
}
pr_debug("frame is too big, fragmentation is needed\n");
err = lowpan_skb_fragmentation(skb, dev);
error:
dev_kfree_skb(skb);
out:
if (err)
pr_debug("ERROR: xmit failed\n");
return (err < 0) ? NET_XMIT_DROP : err;
}
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 u8 lowpan_get_dsn(const struct net_device *dev)
{
struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
}
static struct header_ops lowpan_header_ops = {
.create = lowpan_header_create,
};
static struct lock_class_key lowpan_tx_busylock;
static struct lock_class_key lowpan_netdev_xmit_lock_key;
static void lowpan_set_lockdep_class_one(struct net_device *dev,
struct netdev_queue *txq,
void *_unused)
{
lockdep_set_class(&txq->_xmit_lock,
&lowpan_netdev_xmit_lock_key);
}
static int lowpan_dev_init(struct net_device *dev)
{
netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
dev->qdisc_tx_busylock = &lowpan_tx_busylock;
return 0;
}
static const struct net_device_ops lowpan_netdev_ops = {
.ndo_init = lowpan_dev_init,
.ndo_start_xmit = lowpan_xmit,
.ndo_set_mac_address = lowpan_set_address,
};
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,
.get_dsn = lowpan_get_dsn,
};
static void lowpan_setup(struct net_device *dev)
{
dev->addr_len = IEEE802154_ADDR_LEN;
memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
dev->type = ARPHRD_IEEE802154;
/* Frame Control + Sequence Number + Address fields + Security Header */
dev->hard_header_len = 2 + 1 + 20 + 14;
dev->needed_tailroom = 2; /* FCS */
dev->mtu = 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 = free_netdev;
}
static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
return -EINVAL;
}
return 0;
}
static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct sk_buff *local_skb;
if (!netif_running(dev))
goto drop;
if (dev->type != ARPHRD_IEEE802154)
goto drop;
/* check that it's our buffer */
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
/* Copy the packet so that the IPv6 header is
* properly aligned.
*/
local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
skb_tailroom(skb), GFP_ATOMIC);
if (!local_skb)
goto drop;
local_skb->protocol = htons(ETH_P_IPV6);
local_skb->pkt_type = PACKET_HOST;
/* Pull off the 1-byte of 6lowpan header. */
skb_pull(local_skb, 1);
lowpan_give_skb_to_devices(local_skb, NULL);
kfree_skb(local_skb);
kfree_skb(skb);
} else {
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 */
local_skb = skb_clone(skb, GFP_ATOMIC);
if (!local_skb)
goto drop;
process_data(local_skb);
kfree_skb(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("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;
lowpan_dev_info(dev)->fragment_tag = 0;
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;
/* 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 = __constant_htons(ETH_P_IEEE802154),
.func = lowpan_rcv,
};
static int __init lowpan_init_module(void)
{
int err = 0;
err = lowpan_netlink_init();
if (err < 0)
goto out;
dev_add_pack(&lowpan_packet_type);
err = register_netdevice_notifier(&lowpan_dev_notifier);
if (err < 0) {
dev_remove_pack(&lowpan_packet_type);
lowpan_netlink_fini();
}
out:
return err;
}
static void __exit lowpan_cleanup_module(void)
{
struct lowpan_fragment *frame, *tframe;
lowpan_netlink_fini();
dev_remove_pack(&lowpan_packet_type);
unregister_netdevice_notifier(&lowpan_dev_notifier);
/* Now 6lowpan packet_type is removed, so no new fragments are
* expected on RX, therefore that's the time to clean incomplete
* fragments.
*/
spin_lock_bh(&flist_lock);
list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
del_timer_sync(&frame->timer);
list_del(&frame->list);
dev_kfree_skb(frame->skb);
kfree(frame);
}
spin_unlock_bh(&flist_lock);
}
module_init(lowpan_init_module);
module_exit(lowpan_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_ALIAS_RTNL_LINK("lowpan");
