linux/net/6lowpan/core.c
Thomas Gleixner 1802d0beec treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 655 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:41 -07:00

186 lines
4.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
*
* 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;
switch (lltype) {
case LOWPAN_LLTYPE_IEEE802154:
dev->addr_len = EUI64_ADDR_LEN;
break;
case LOWPAN_LLTYPE_BTLE:
dev->addr_len = ETH_ALEN;
break;
}
dev->type = ARPHRD_6LOWPAN;
dev->mtu = IPV6_MIN_MTU;
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;
dev->ndisc_ops = &lowpan_ndisc_ops;
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);
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");