net/6lowpan/core.c

   1 /* This program is free software; you can redistribute it and/or modify
   2  * it under the terms of the GNU General Public License version 2
   3  * as published by the Free Software Foundation.
   4  *
   5  * This program is distributed in the hope that it will be useful,
   6  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   7  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   8  * GNU General Public License for more details.
   9  *
  10  * Authors:
  11  * (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
  12  */
  13
  14 #include <linux/module.h>
  15
  16 #include <net/6lowpan.h>
  17
  18 #include "6lowpan_i.h"
  19
  20 int lowpan_register_netdevice(struct net_device *dev,
  21                               enum lowpan_lltypes lltype)
  22 {
  23         int i, ret;
  24
  25         dev->addr_len = EUI64_ADDR_LEN;
  26         dev->type = ARPHRD_6LOWPAN;
  27         dev->mtu = IPV6_MIN_MTU;
  28         dev->priv_flags |= IFF_NO_QUEUE;
  29
  30         lowpan_dev(dev)->lltype = lltype;
  31
  32         spin_lock_init(&lowpan_dev(dev)->ctx.lock);
  33         for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
  34                 lowpan_dev(dev)->ctx.table[i].id = i;
  35
  36         ret = register_netdevice(dev);
  37         if (ret < 0)
  38                 return ret;
  39
  40         ret = lowpan_dev_debugfs_init(dev);
  41         if (ret < 0)
  42                 unregister_netdevice(dev);
  43
  44         return ret;
  45 }
  46 EXPORT_SYMBOL(lowpan_register_netdevice);
  47
  48 int lowpan_register_netdev(struct net_device *dev,
  49                            enum lowpan_lltypes lltype)
  50 {
  51         int ret;
  52
  53         rtnl_lock();
  54         ret = lowpan_register_netdevice(dev, lltype);
  55         rtnl_unlock();
  56         return ret;
  57 }
  58 EXPORT_SYMBOL(lowpan_register_netdev);
  59
  60 void lowpan_unregister_netdevice(struct net_device *dev)
  61 {
  62         unregister_netdevice(dev);
  63         lowpan_dev_debugfs_exit(dev);
  64 }
  65 EXPORT_SYMBOL(lowpan_unregister_netdevice);
  66
  67 void lowpan_unregister_netdev(struct net_device *dev)
  68 {
  69         rtnl_lock();
  70         lowpan_unregister_netdevice(dev);
  71         rtnl_unlock();
  72 }
  73 EXPORT_SYMBOL(lowpan_unregister_netdev);
  74
  75 static int lowpan_event(struct notifier_block *unused,
  76                         unsigned long event, void *ptr)
  77 {
  78         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  79         int i;
  80
  81         if (dev->type != ARPHRD_6LOWPAN)
  82                 return NOTIFY_DONE;
  83
  84         switch (event) {
  85         case NETDEV_DOWN:
  86                 for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
  87                         clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE,
  88                                   &lowpan_dev(dev)->ctx.table[i].flags);
  89                 break;
  90         default:
  91                 return NOTIFY_DONE;
  92         }
  93
  94         return NOTIFY_OK;
  95 }
  96
  97 static struct notifier_block lowpan_notifier = {
  98         .notifier_call = lowpan_event,
  99 };
 100
 101 static int __init lowpan_module_init(void)
 102 {
 103         int ret;
 104
 105         ret = lowpan_debugfs_init();
 106         if (ret < 0)
 107                 return ret;
 108
 109         ret = register_netdevice_notifier(&lowpan_notifier);
 110         if (ret < 0) {
 111                 lowpan_debugfs_exit();
 112                 return ret;
 113         }
 114
 115         request_module_nowait("ipv6");
 116
 117         request_module_nowait("nhc_dest");
 118         request_module_nowait("nhc_fragment");
 119         request_module_nowait("nhc_hop");
 120         request_module_nowait("nhc_ipv6");
 121         request_module_nowait("nhc_mobility");
 122         request_module_nowait("nhc_routing");
 123         request_module_nowait("nhc_udp");
 124
 125         return 0;
 126 }
 127
 128 static void __exit lowpan_module_exit(void)
 129 {
 130         lowpan_debugfs_exit();
 131         unregister_netdevice_notifier(&lowpan_notifier);
 132 }
 133
 134 module_init(lowpan_module_init);
 135 module_exit(lowpan_module_exit);
 136
 137 MODULE_LICENSE("GPL");