net/bridge/br.c

   1 /*
   2  *      Generic parts
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   7  *
   8  *      $Id: br.c,v 1.47 2001/12/24 00:56:41 davem Exp $
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/init.h>
  21 #include <linux/llc.h>
  22 #include <net/llc.h>
  23
  24 #include "br_private.h"
  25
  26 int (*br_should_route_hook)(struct sk_buff *skb);
  27
  28 static struct llc_sap *br_stp_sap;
  29
  30 static int __init br_init(void)
  31 {
  32         int err;
  33
  34         br_stp_sap = llc_sap_open(LLC_SAP_BSPAN, br_stp_rcv);
  35         if (!br_stp_sap) {
  36                 printk(KERN_ERR "bridge: can't register sap for STP\n");
  37                 return -EADDRINUSE;
  38         }
  39
  40         err = br_fdb_init();
  41         if (err)
  42                 goto err_out;
  43
  44         err = br_netfilter_init();
  45         if (err)
  46                 goto err_out1;
  47
  48         err = register_netdevice_notifier(&br_device_notifier);
  49         if (err)
  50                 goto err_out2;
  51
  52         err = br_netlink_init();
  53         if (err)
  54                 goto err_out3;
  55
  56         brioctl_set(br_ioctl_deviceless_stub);
  57         br_handle_frame_hook = br_handle_frame;
  58
  59         br_fdb_get_hook = br_fdb_get;
  60         br_fdb_put_hook = br_fdb_put;
  61
  62         return 0;
  63 err_out3:
  64         unregister_netdevice_notifier(&br_device_notifier);
  65 err_out2:
  66         br_netfilter_fini();
  67 err_out1:
  68         br_fdb_fini();
  69 err_out:
  70         llc_sap_put(br_stp_sap);
  71         return err;
  72 }
  73
  74 static void __exit br_deinit(void)
  75 {
  76         rcu_assign_pointer(br_stp_sap->rcv_func, NULL);
  77
  78         br_netlink_fini();
  79         br_netfilter_fini();
  80         unregister_netdevice_notifier(&br_device_notifier);
  81         brioctl_set(NULL);
  82
  83         br_cleanup_bridges();
  84
  85         synchronize_net();
  86
  87         llc_sap_put(br_stp_sap);
  88         br_fdb_get_hook = NULL;
  89         br_fdb_put_hook = NULL;
  90
  91         br_handle_frame_hook = NULL;
  92         br_fdb_fini();
  93 }
  94
  95 EXPORT_SYMBOL(br_should_route_hook);
  96
  97 module_init(br_init)
  98 module_exit(br_deinit)
  99 MODULE_LICENSE("GPL");
 100 MODULE_VERSION(BR_VERSION);