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/* 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.
*
* Authors:
* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
*/
#include <linux/module.h>
#include <net/6lowpan.h>
#include <net/addrconf.h>
#include "6lowpan_i.h"
int lowpan_register_netdevice(struct net_device *dev,
enum lowpan_lltypes lltype)
{
int i, ret;
dev->addr_len = EUI64_ADDR_LEN;
dev->type = ARPHRD_6LOWPAN;
dev->mtu = IPV6_MIN_MTU;
dev->priv_flags |= IFF_NO_QUEUE;
lowpan_dev(dev)->lltype = lltype;
spin_lock_init(&lowpan_dev(dev)->ctx.lock);
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
lowpan_dev(dev)->ctx.table[i].id = i;
ret = register_netdevice(dev);
if (ret < 0)
return ret;
ret = lowpan_dev_debugfs_init(dev);
if (ret < 0)
unregister_netdevice(dev);
return ret;
}
EXPORT_SYMBOL(lowpan_register_netdevice);
int lowpan_register_netdev(struct net_device *dev,
enum lowpan_lltypes lltype)
{
int ret;
rtnl_lock();
ret = lowpan_register_netdevice(dev, lltype);
rtnl_unlock();
return ret;
}
EXPORT_SYMBOL(lowpan_register_netdev);
void lowpan_unregister_netdevice(struct net_device *dev)
{
unregister_netdevice(dev);
lowpan_dev_debugfs_exit(dev);
}
EXPORT_SYMBOL(lowpan_unregister_netdevice);
void lowpan_unregister_netdev(struct net_device *dev)
{
rtnl_lock();
lowpan_unregister_netdevice(dev);
rtnl_unlock();
}
EXPORT_SYMBOL(lowpan_unregister_netdev);
static int addrconf_ifid_802154_6lowpan(u8 *eui, struct net_device *dev)
{
struct wpan_dev *wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
/* Set short_addr autoconfiguration if short_addr is present only */
if (!lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
return -1;
/* For either address format, all zero addresses MUST NOT be used */
if (wpan_dev->pan_id == cpu_to_le16(0x0000) &&
wpan_dev->short_addr == cpu_to_le16(0x0000))
return -1;
/* Alternatively, if no PAN ID is known, 16 zero bits may be used */
if (wpan_dev->pan_id == cpu_to_le16(IEEE802154_PAN_ID_BROADCAST))
memset(eui, 0, 2);
else
ieee802154_le16_to_be16(eui, &wpan_dev->pan_id);
/* The "Universal/Local" (U/L) bit shall be set to zero */
eui[0] &= ~2;
eui[2] = 0;
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[5] = 0;
ieee802154_le16_to_be16(&eui[6], &wpan_dev->short_addr);
return 0;
}
static int lowpan_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct inet6_dev *idev;
struct in6_addr addr;
int i;
if (dev->type != ARPHRD_6LOWPAN)
return NOTIFY_DONE;
idev = __in6_dev_get(dev);
if (!idev)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
case NETDEV_CHANGE:
/* (802.15.4 6LoWPAN short address slaac handling */
if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) &&
addrconf_ifid_802154_6lowpan(addr.s6_addr + 8, dev) == 0) {
__ipv6_addr_set_half(&addr.s6_addr32[0],
htonl(0xFE800000), 0);
addrconf_add_linklocal(idev, &addr, 0);
}
break;
case NETDEV_DOWN:
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE,
&lowpan_dev(dev)->ctx.table[i].flags);
break;
default:
return NOTIFY_DONE;
}
return NOTIFY_OK;
}
static struct notifier_block lowpan_notifier = {
.notifier_call = lowpan_event,
};
static int __init lowpan_module_init(void)
{
int ret;
ret = lowpan_debugfs_init();
if (ret < 0)
return ret;
ret = register_netdevice_notifier(&lowpan_notifier);
if (ret < 0) {
lowpan_debugfs_exit();
return ret;
}
request_module_nowait("nhc_dest");
request_module_nowait("nhc_fragment");
request_module_nowait("nhc_hop");
request_module_nowait("nhc_ipv6");
request_module_nowait("nhc_mobility");
request_module_nowait("nhc_routing");
request_module_nowait("nhc_udp");
return 0;
}
static void __exit lowpan_module_exit(void)
{
lowpan_debugfs_exit();
unregister_netdevice_notifier(&lowpan_notifier);
}
module_init(lowpan_module_init);
module_exit(lowpan_module_exit);
MODULE_LICENSE("GPL");
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