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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Because we don't care if debugfs works or not, this trickles back a bit so we can clean things up by making some functions return void instead of an error value that is never going to fail. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
181 lines
4 KiB
C
181 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Authors:
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* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
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*/
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#include <linux/module.h>
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#include <net/6lowpan.h>
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#include <net/addrconf.h>
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#include "6lowpan_i.h"
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int lowpan_register_netdevice(struct net_device *dev,
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enum lowpan_lltypes lltype)
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{
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int i, ret;
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switch (lltype) {
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case LOWPAN_LLTYPE_IEEE802154:
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dev->addr_len = EUI64_ADDR_LEN;
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break;
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case LOWPAN_LLTYPE_BTLE:
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dev->addr_len = ETH_ALEN;
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break;
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}
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dev->type = ARPHRD_6LOWPAN;
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dev->mtu = IPV6_MIN_MTU;
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lowpan_dev(dev)->lltype = lltype;
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spin_lock_init(&lowpan_dev(dev)->ctx.lock);
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for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
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lowpan_dev(dev)->ctx.table[i].id = i;
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dev->ndisc_ops = &lowpan_ndisc_ops;
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ret = register_netdevice(dev);
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if (ret < 0)
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return ret;
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lowpan_dev_debugfs_init(dev);
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return ret;
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}
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EXPORT_SYMBOL(lowpan_register_netdevice);
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int lowpan_register_netdev(struct net_device *dev,
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enum lowpan_lltypes lltype)
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{
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int ret;
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rtnl_lock();
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ret = lowpan_register_netdevice(dev, lltype);
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rtnl_unlock();
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return ret;
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}
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EXPORT_SYMBOL(lowpan_register_netdev);
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void lowpan_unregister_netdevice(struct net_device *dev)
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{
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unregister_netdevice(dev);
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lowpan_dev_debugfs_exit(dev);
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}
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EXPORT_SYMBOL(lowpan_unregister_netdevice);
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void lowpan_unregister_netdev(struct net_device *dev)
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{
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rtnl_lock();
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lowpan_unregister_netdevice(dev);
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rtnl_unlock();
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}
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EXPORT_SYMBOL(lowpan_unregister_netdev);
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int addrconf_ifid_802154_6lowpan(u8 *eui, struct net_device *dev)
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{
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struct wpan_dev *wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
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/* Set short_addr autoconfiguration if short_addr is present only */
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if (!lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
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return -1;
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/* For either address format, all zero addresses MUST NOT be used */
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if (wpan_dev->pan_id == cpu_to_le16(0x0000) &&
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wpan_dev->short_addr == cpu_to_le16(0x0000))
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return -1;
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/* Alternatively, if no PAN ID is known, 16 zero bits may be used */
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if (wpan_dev->pan_id == cpu_to_le16(IEEE802154_PAN_ID_BROADCAST))
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memset(eui, 0, 2);
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else
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ieee802154_le16_to_be16(eui, &wpan_dev->pan_id);
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/* The "Universal/Local" (U/L) bit shall be set to zero */
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eui[0] &= ~2;
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eui[2] = 0;
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eui[3] = 0xFF;
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eui[4] = 0xFE;
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eui[5] = 0;
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ieee802154_le16_to_be16(&eui[6], &wpan_dev->short_addr);
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return 0;
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}
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static int lowpan_event(struct notifier_block *unused,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct inet6_dev *idev;
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struct in6_addr addr;
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int i;
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if (dev->type != ARPHRD_6LOWPAN)
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return NOTIFY_DONE;
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idev = __in6_dev_get(dev);
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if (!idev)
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return NOTIFY_DONE;
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switch (event) {
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case NETDEV_UP:
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case NETDEV_CHANGE:
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/* (802.15.4 6LoWPAN short address slaac handling */
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if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) &&
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addrconf_ifid_802154_6lowpan(addr.s6_addr + 8, dev) == 0) {
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__ipv6_addr_set_half(&addr.s6_addr32[0],
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htonl(0xFE800000), 0);
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addrconf_add_linklocal(idev, &addr, 0);
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}
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break;
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case NETDEV_DOWN:
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for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
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clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE,
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&lowpan_dev(dev)->ctx.table[i].flags);
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break;
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default:
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return NOTIFY_DONE;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block lowpan_notifier = {
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.notifier_call = lowpan_event,
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};
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static int __init lowpan_module_init(void)
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{
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int ret;
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lowpan_debugfs_init();
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ret = register_netdevice_notifier(&lowpan_notifier);
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if (ret < 0) {
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lowpan_debugfs_exit();
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return ret;
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}
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request_module_nowait("nhc_dest");
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request_module_nowait("nhc_fragment");
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request_module_nowait("nhc_hop");
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request_module_nowait("nhc_ipv6");
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request_module_nowait("nhc_mobility");
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request_module_nowait("nhc_routing");
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request_module_nowait("nhc_udp");
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return 0;
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}
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static void __exit lowpan_module_exit(void)
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{
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lowpan_debugfs_exit();
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unregister_netdevice_notifier(&lowpan_notifier);
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}
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module_init(lowpan_module_init);
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module_exit(lowpan_module_exit);
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MODULE_LICENSE("GPL");
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