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
  22 #include "br_private.h"
  23
  24 int (*br_should_route_hook)(struct sk_buff *skb);
  25
  26 static struct llc_sap *br_stp_sap;
  27
  28 static int __init br_init(void)
  29 {
  30         int err;
  31
  32         br_stp_sap = llc_sap_open(LLC_SAP_BSPAN, br_stp_rcv);
  33         if (!br_stp_sap) {
  34                 printk(KERN_ERR "bridge: can't register sap for STP\n");
  35                 return -EADDRINUSE;
  36         }
  37
  38         err = br_fdb_init();
  39         if (err)
  40                 goto err_out;
  41
  42         err = br_netfilter_init();
  43         if (err)
  44                 goto err_out1;
  45
  46         err = register_netdevice_notifier(&br_device_notifier);
  47         if (err)
  48                 goto err_out2;
  49
  50         err = br_netlink_init();
  51         if (err)
  52                 goto err_out3;
  53
  54         brioctl_set(br_ioctl_deviceless_stub);
  55         br_handle_frame_hook = br_handle_frame;
  56
  57         br_fdb_get_hook = br_fdb_get;
  58         br_fdb_put_hook = br_fdb_put;
  59
  60         return 0;
  61 err_out3:
  62         unregister_netdevice_notifier(&br_device_notifier);
  63 err_out2:
  64         br_netfilter_fini();
  65 err_out1:
  66         br_fdb_fini();
  67 err_out:
  68         llc_sap_put(br_stp_sap);
  69         return err;
  70 }
  71
  72 static void __exit br_deinit(void)
  73 {
  74         rcu_assign_pointer(br_stp_sap->rcv_func, NULL);
  75
  76         br_netlink_fini();
  77         unregister_netdevice_notifier(&br_device_notifier);
  78         brioctl_set(NULL);
  79
  80         br_cleanup_bridges();
  81
  82         synchronize_net();
  83
  84         br_netfilter_fini();
  85         llc_sap_put(br_stp_sap);
  86         br_fdb_get_hook = NULL;
  87         br_fdb_put_hook = NULL;
  88
  89         br_handle_frame_hook = NULL;
  90         br_fdb_fini();
  91 }
  92
  93 EXPORT_SYMBOL(br_should_route_hook);
  94
  95 module_init(br_init)
  96 module_exit(br_deinit)
  97 MODULE_LICENSE("GPL");
  98 MODULE_VERSION(BR_VERSION);