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5609c185f2
This patch introduce support for IPHC stateful address compression. It will offer the context table via one debugfs entry. This debugfs has and directory for each cid entry for the context table. Inside each cid directory there exists the following files: - "active": If the entry is added or deleted. The context table is original a list implementation, this flag will indicate if the context is part of list or not. - "prefix": The ipv6 prefix. - "prefix_length": The prefix length for the prefix. - "compression": The compression flag according RFC6775. This part should be moved into sysfs after some testing time. Also the debugfs entry contains a "show" file which is a pretty-printout for the current context table information. Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com> Signed-off-by: Alexander Aring <aar@pengutronix.de> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
/* 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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* 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 "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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dev->addr_len = EUI64_ADDR_LEN;
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dev->type = ARPHRD_6LOWPAN;
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dev->mtu = IPV6_MIN_MTU;
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dev->priv_flags |= IFF_NO_QUEUE;
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lowpan_priv(dev)->lltype = lltype;
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spin_lock_init(&lowpan_priv(dev)->ctx.lock);
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for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
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lowpan_priv(dev)->ctx.table[i].id = i;
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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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ret = lowpan_dev_debugfs_init(dev);
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if (ret < 0)
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unregister_netdevice(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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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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int i;
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if (dev->type != ARPHRD_6LOWPAN)
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return NOTIFY_DONE;
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switch (event) {
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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_priv(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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ret = lowpan_debugfs_init();
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if (ret < 0)
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return ret;
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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("ipv6");
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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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