release/src-rt-6.x.4708/linux/linux-2.6.36/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 int (*br_should_route_hook)(struct sk_buff *skb);
  26
  27 static const struct stp_proto br_stp_proto = {
  28         .rcv    = br_stp_rcv,
  29 };
  30
  31 static struct pernet_operations br_net_ops = {
  32         .exit   = br_net_exit,
  33 };
  34
  35 static int __init br_init(void)
  36 {
  37         int err;
  38
  39         err = stp_proto_register(&br_stp_proto);
  40         if (err < 0) {
  41                 pr_err("bridge: can't register sap for STP\n");
  42                 return err;
  43         }
  44
  45         err = br_fdb_init();
  46         if (err)
  47                 goto err_out;
  48
  49         err = register_pernet_subsys(&br_net_ops);
  50         if (err)
  51                 goto err_out1;
  52
  53         err = br_netfilter_init();
  54         if (err)
  55                 goto err_out2;
  56
  57         err = register_netdevice_notifier(&br_device_notifier);
  58         if (err)
  59                 goto err_out3;
  60
  61         err = br_netlink_init();
  62         if (err)
  63                 goto err_out4;
  64
  65         brioctl_set(br_ioctl_deviceless_stub);
  66
  67 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
  68         br_fdb_test_addr_hook = br_fdb_test_addr;
  69 #endif
  70
  71         return 0;
  72 err_out4:
  73         unregister_netdevice_notifier(&br_device_notifier);
  74 err_out3:
  75         br_netfilter_fini();
  76 err_out2:
  77         unregister_pernet_subsys(&br_net_ops);
  78 err_out1:
  79         br_fdb_fini();
  80 err_out:
  81         stp_proto_unregister(&br_stp_proto);
  82         return err;
  83 }
  84
  85 static void __exit br_deinit(void)
  86 {
  87         stp_proto_unregister(&br_stp_proto);
  88
  89         br_netlink_fini();
  90         unregister_netdevice_notifier(&br_device_notifier);
  91         brioctl_set(NULL);
  92
  93         unregister_pernet_subsys(&br_net_ops);
  94
  95         rcu_barrier(); /* Wait for completion of call_rcu()'s */
  96
  97         br_netfilter_fini();
  98 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
  99         br_fdb_test_addr_hook = NULL;
 100 #endif
 101
 102         br_fdb_fini();
 103 }
 104
 105 EXPORT_SYMBOL(br_should_route_hook);
 106
 107 module_init(br_init)
 108 module_exit(br_deinit)
 109 MODULE_LICENSE("GPL");
 110 MODULE_VERSION(BR_VERSION);