net/bridge/br_device.c

   1 /*
   2  *      Device handling code
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   7  *
   8  *      $Id: br_device.c,v 1.6 2001/12/24 00:59:55 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/kernel.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/module.h>
  19 #include <asm/uaccess.h>
  20 #include "br_private.h"
  21
  22 static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
  23 {
  24         struct net_bridge *br = netdev_priv(dev);
  25         return &br->statistics;
  26 }
  27
  28 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  29 {
  30         struct net_bridge *br = netdev_priv(dev);
  31         const unsigned char *dest = skb->data;
  32         struct net_bridge_fdb_entry *dst;
  33
  34         br->statistics.tx_packets++;
  35         br->statistics.tx_bytes += skb->len;
  36
  37         skb->mac.raw = skb->data;
  38         skb_pull(skb, ETH_HLEN);
  39
  40         rcu_read_lock();
  41         if (dest[0] & 1)
  42                 br_flood_deliver(br, skb, 0);
  43         else if ((dst = __br_fdb_get(br, dest)) != NULL)
  44                 br_deliver(dst->dst, skb);
  45         else
  46                 br_flood_deliver(br, skb, 0);
  47
  48         rcu_read_unlock();
  49         return 0;
  50 }
  51
  52 static int br_dev_open(struct net_device *dev)
  53 {
  54         struct net_bridge *br = netdev_priv(dev);
  55
  56         br_features_recompute(br);
  57         netif_start_queue(dev);
  58         br_stp_enable_bridge(br);
  59
  60         return 0;
  61 }
  62
  63 static void br_dev_set_multicast_list(struct net_device *dev)
  64 {
  65 }
  66
  67 static int br_dev_stop(struct net_device *dev)
  68 {
  69         br_stp_disable_bridge(netdev_priv(dev));
  70
  71         netif_stop_queue(dev);
  72
  73         return 0;
  74 }
  75
  76 static int br_change_mtu(struct net_device *dev, int new_mtu)
  77 {
  78         if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
  79                 return -EINVAL;
  80
  81         dev->mtu = new_mtu;
  82         return 0;
  83 }
  84
  85 void br_dev_setup(struct net_device *dev)
  86 {
  87         memset(dev->dev_addr, 0, ETH_ALEN);
  88
  89         ether_setup(dev);
  90
  91         dev->do_ioctl = br_dev_ioctl;
  92         dev->get_stats = br_dev_get_stats;
  93         dev->hard_start_xmit = br_dev_xmit;
  94         dev->open = br_dev_open;
  95         dev->set_multicast_list = br_dev_set_multicast_list;
  96         dev->change_mtu = br_change_mtu;
  97         dev->destructor = free_netdev;
  98         SET_MODULE_OWNER(dev);
  99         dev->stop = br_dev_stop;
 100         dev->tx_queue_len = 0;
 101         dev->set_mac_address = NULL;
 102         dev->priv_flags = IFF_EBRIDGE;
 103 }