net/bridge/br.c

   1 /*
   2  *      Generic parts
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/init.h>
  19 #include <linux/llc.h>
  20 #include <net/llc.h>
  21 #include <net/stp.h>
  22
  23 #include "br_private.h"
  24
  25 static void __net_exit br_net_exit(struct net *net)
  26 {
  27         struct net_device *dev;
  28         LIST_HEAD(list);
  29
  30         rtnl_lock();
  31         for_each_netdev(net, dev)
  32                 if (dev->priv_flags & IFF_EBRIDGE)
  33                         br_dev_delete(dev, &list);
  34
  35         unregister_netdevice_many(&list);
  36         rtnl_unlock();
  37
  38 }
  39
  40 static struct pernet_operations br_net_ops = {
  41         .exit   = br_net_exit,
  42 };
  43
  44 static const struct stp_proto br_stp_proto = {
  45         .rcv    = br_stp_rcv,
  46 };
  47
  48 static int __init br_init(void)
  49 {
  50         int err;
  51
  52         err = stp_proto_register(&br_stp_proto);
  53         if (err < 0) {
  54                 pr_err("bridge: can't register sap for STP\n");
  55                 return err;
  56         }
  57
  58         err = br_fdb_init();
  59         if (err)
  60                 goto err_out;
  61
  62         err = register_pernet_subsys(&br_net_ops);
  63         if (err)
  64                 goto err_out1;
  65
  66         err = br_netfilter_init();
  67         if (err)
  68                 goto err_out2;
  69
  70         err = register_netdevice_notifier(&br_device_notifier);
  71         if (err)
  72                 goto err_out3;
  73
  74         err = br_netlink_init();
  75         if (err)
  76                 goto err_out4;
  77
  78         brioctl_set(br_ioctl_deviceless_stub);
  79
  80 #if IS_ENABLED(CONFIG_ATM_LANE)
  81         br_fdb_test_addr_hook = br_fdb_test_addr;
  82 #endif
  83
  84         return 0;
  85 err_out4:
  86         unregister_netdevice_notifier(&br_device_notifier);
  87 err_out3:
  88         br_netfilter_fini();
  89 err_out2:
  90         unregister_pernet_subsys(&br_net_ops);
  91 err_out1:
  92         br_fdb_fini();
  93 err_out:
  94         stp_proto_unregister(&br_stp_proto);
  95         return err;
  96 }
  97
  98 static void __exit br_deinit(void)
  99 {
 100         stp_proto_unregister(&br_stp_proto);
 101
 102         br_netlink_fini();
 103         unregister_netdevice_notifier(&br_device_notifier);
 104         brioctl_set(NULL);
 105
 106         unregister_pernet_subsys(&br_net_ops);
 107
 108         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 109
 110         br_netfilter_fini();
 111 #if IS_ENABLED(CONFIG_ATM_LANE)
 112         br_fdb_test_addr_hook = NULL;
 113 #endif
 114
 115         br_fdb_fini();
 116 }
 117
 118 module_init(br_init)
 119 module_exit(br_deinit)
 120 MODULE_LICENSE("GPL");
 121 MODULE_VERSION(BR_VERSION);
 122 MODULE_ALIAS_RTNL_LINK("bridge");