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/config.h>
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/init.h>
  22 #include <linux/llc.h>
  23 #include <net/llc.h>
  24
  25 #include "br_private.h"
  26
  27 int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
  28
  29 static struct llc_sap *br_stp_sap;
  30
  31 static int __init br_init(void)
  32 {
  33         int err;
  34
  35         br_stp_sap = llc_sap_open(LLC_SAP_BSPAN, br_stp_rcv);
  36         if (!br_stp_sap) {
  37                 printk(KERN_ERR "bridge: can't register sap for STP\n");
  38                 return -EADDRINUSE;
  39         }
  40
  41         br_fdb_init();
  42
  43         err = br_netfilter_init();
  44         if (err)
  45                 goto err_out1;
  46
  47         err = register_netdevice_notifier(&br_device_notifier);
  48         if (err)
  49                 goto err_out2;
  50
  51         br_netlink_init();
  52         brioctl_set(br_ioctl_deviceless_stub);
  53         br_handle_frame_hook = br_handle_frame;
  54
  55         br_fdb_get_hook = br_fdb_get;
  56         br_fdb_put_hook = br_fdb_put;
  57
  58         return 0;
  59
  60 err_out2:
  61         br_netfilter_fini();
  62 err_out1:
  63         llc_sap_put(br_stp_sap);
  64         return err;
  65 }
  66
  67 static void __exit br_deinit(void)
  68 {
  69         rcu_assign_pointer(br_stp_sap->rcv_func, NULL);
  70
  71         br_netlink_fini();
  72         br_netfilter_fini();
  73         unregister_netdevice_notifier(&br_device_notifier);
  74         brioctl_set(NULL);
  75
  76         br_cleanup_bridges();
  77
  78         synchronize_net();
  79
  80         llc_sap_put(br_stp_sap);
  81         br_fdb_get_hook = NULL;
  82         br_fdb_put_hook = NULL;
  83
  84         br_handle_frame_hook = NULL;
  85         br_fdb_fini();
  86 }
  87
  88 EXPORT_SYMBOL(br_should_route_hook);
  89
  90 module_init(br_init)
  91 module_exit(br_deinit)
  92 MODULE_LICENSE("GPL");
  93 MODULE_VERSION(BR_VERSION);