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;
  25
  26         br = dev->priv;
  27
  28         return &br->statistics;
  29 }
  30
  31 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  32 {
  33         struct net_bridge *br = netdev_priv(dev);
  34         const unsigned char *dest = skb->data;
  35         struct net_bridge_fdb_entry *dst;
  36
  37         br->statistics.tx_packets++;
  38         br->statistics.tx_bytes += skb->len;
  39
  40         skb->mac.raw = skb->data;
  41         skb_pull(skb, ETH_HLEN);
  42
  43         rcu_read_lock();
  44         if (dest[0] & 1)
  45                 br_flood_deliver(br, skb, 0);
  46         else if ((dst = __br_fdb_get(br, dest)) != NULL)
  47                 br_deliver(dst->dst, skb);
  48         else
  49                 br_flood_deliver(br, skb, 0);
  50
  51         rcu_read_unlock();
  52         return 0;
  53 }
  54
  55 static int br_dev_open(struct net_device *dev)
  56 {
  57         netif_start_queue(dev);
  58
  59         br_stp_enable_bridge(dev->priv);
  60
  61         return 0;
  62 }
  63
  64 static void br_dev_set_multicast_list(struct net_device *dev)
  65 {
  66 }
  67
  68 static int br_dev_stop(struct net_device *dev)
  69 {
  70         br_stp_disable_bridge(dev->priv);
  71
  72         netif_stop_queue(dev);
  73
  74         return 0;
  75 }
  76
  77 static int br_change_mtu(struct net_device *dev, int new_mtu)
  78 {
  79         if ((new_mtu < 68) || new_mtu > br_min_mtu(dev->priv))
  80                 return -EINVAL;
  81
  82         dev->mtu = new_mtu;
  83         return 0;
  84 }
  85
  86 static int br_dev_accept_fastpath(struct net_device *dev, struct dst_entry *dst)
  87 {
  88         return -1;
  89 }
  90
  91 void br_dev_setup(struct net_device *dev)
  92 {
  93         memset(dev->dev_addr, 0, ETH_ALEN);
  94
  95         ether_setup(dev);
  96
  97         dev->do_ioctl = br_dev_ioctl;
  98         dev->get_stats = br_dev_get_stats;
  99         dev->hard_start_xmit = br_dev_xmit;
 100         dev->open = br_dev_open;
 101         dev->set_multicast_list = br_dev_set_multicast_list;
 102         dev->change_mtu = br_change_mtu;
 103         dev->destructor = free_netdev;
 104         SET_MODULE_OWNER(dev);
 105         dev->stop = br_dev_stop;
 106         dev->accept_fastpath = br_dev_accept_fastpath;
 107         dev->tx_queue_len = 0;
 108         dev->set_mac_address = NULL;
 109         dev->priv_flags = IFF_EBRIDGE;
 110 }