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/etherdevice.h>
  19 #include <linux/ethtool.h>
  20
  21 #include <asm/uaccess.h>
  22 #include "br_private.h"
  23
  24 static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
  25 {
  26         struct net_bridge *br = netdev_priv(dev);
  27         return &br->statistics;
  28 }
  29
  30 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  31 {
  32         struct net_bridge *br = netdev_priv(dev);
  33         const unsigned char *dest = skb->data;
  34         struct net_bridge_fdb_entry *dst;
  35
  36         br->statistics.tx_packets++;
  37         br->statistics.tx_bytes += skb->len;
  38
  39         skb->mac.raw = skb->data;
  40         skb_pull(skb, ETH_HLEN);
  41
  42         rcu_read_lock();
  43         if (dest[0] & 1)
  44                 br_flood_deliver(br, skb, 0);
  45         else if ((dst = __br_fdb_get(br, dest)) != NULL)
  46                 br_deliver(dst->dst, skb);
  47         else
  48                 br_flood_deliver(br, skb, 0);
  49
  50         rcu_read_unlock();
  51         return 0;
  52 }
  53
  54 static int br_dev_open(struct net_device *dev)
  55 {
  56         struct net_bridge *br = netdev_priv(dev);
  57
  58         br_features_recompute(br);
  59         netif_start_queue(dev);
  60         br_stp_enable_bridge(br);
  61
  62         return 0;
  63 }
  64
  65 static void br_dev_set_multicast_list(struct net_device *dev)
  66 {
  67 }
  68
  69 static int br_dev_stop(struct net_device *dev)
  70 {
  71         br_stp_disable_bridge(netdev_priv(dev));
  72
  73         netif_stop_queue(dev);
  74
  75         return 0;
  76 }
  77
  78 static int br_change_mtu(struct net_device *dev, int new_mtu)
  79 {
  80         if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
  81                 return -EINVAL;
  82
  83         dev->mtu = new_mtu;
  84         return 0;
  85 }
  86
  87 /* Allow setting mac address of pseudo-bridge to be same as
  88  * any of the bound interfaces
  89  */
  90 static int br_set_mac_address(struct net_device *dev, void *p)
  91 {
  92         struct net_bridge *br = netdev_priv(dev);
  93         struct sockaddr *addr = p;
  94         struct net_bridge_port *port;
  95         int err = -EADDRNOTAVAIL;
  96
  97         spin_lock_bh(&br->lock);
  98         list_for_each_entry(port, &br->port_list, list) {
  99                 if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) {
 100                         br_stp_change_bridge_id(br, addr->sa_data);
 101                         err = 0;
 102                         break;
 103                 }
 104         }
 105         spin_unlock_bh(&br->lock);
 106
 107         return err;
 108 }
 109
 110 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 111 {
 112         strcpy(info->driver, "bridge");
 113         strcpy(info->version, BR_VERSION);
 114         strcpy(info->fw_version, "N/A");
 115         strcpy(info->bus_info, "N/A");
 116 }
 117
 118 static int br_set_sg(struct net_device *dev, u32 data)
 119 {
 120         struct net_bridge *br = netdev_priv(dev);
 121
 122         if (data)
 123                 br->feature_mask |= NETIF_F_SG;
 124         else
 125                 br->feature_mask &= ~NETIF_F_SG;
 126
 127         br_features_recompute(br);
 128         return 0;
 129 }
 130
 131 static int br_set_tso(struct net_device *dev, u32 data)
 132 {
 133         struct net_bridge *br = netdev_priv(dev);
 134
 135         if (data)
 136                 br->feature_mask |= NETIF_F_TSO;
 137         else
 138                 br->feature_mask &= ~NETIF_F_TSO;
 139
 140         br_features_recompute(br);
 141         return 0;
 142 }
 143
 144 static int br_set_tx_csum(struct net_device *dev, u32 data)
 145 {
 146         struct net_bridge *br = netdev_priv(dev);
 147
 148         if (data)
 149                 br->feature_mask |= NETIF_F_IP_CSUM;
 150         else
 151                 br->feature_mask &= ~NETIF_F_IP_CSUM;
 152
 153         br_features_recompute(br);
 154         return 0;
 155 }
 156
 157 static struct ethtool_ops br_ethtool_ops = {
 158         .get_drvinfo = br_getinfo,
 159         .get_link = ethtool_op_get_link,
 160         .get_sg = ethtool_op_get_sg,
 161         .set_sg = br_set_sg,
 162         .get_tx_csum = ethtool_op_get_tx_csum,
 163         .set_tx_csum = br_set_tx_csum,
 164         .get_tso = ethtool_op_get_tso,
 165         .set_tso = br_set_tso,
 166 };
 167
 168 void br_dev_setup(struct net_device *dev)
 169 {
 170         memset(dev->dev_addr, 0, ETH_ALEN);
 171
 172         ether_setup(dev);
 173
 174         dev->do_ioctl = br_dev_ioctl;
 175         dev->get_stats = br_dev_get_stats;
 176         dev->hard_start_xmit = br_dev_xmit;
 177         dev->open = br_dev_open;
 178         dev->set_multicast_list = br_dev_set_multicast_list;
 179         dev->change_mtu = br_change_mtu;
 180         dev->destructor = free_netdev;
 181         SET_MODULE_OWNER(dev);
 182         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 183         dev->stop = br_dev_stop;
 184         dev->tx_queue_len = 0;
 185         dev->set_mac_address = br_set_mac_address;
 186         dev->priv_flags = IFF_EBRIDGE;
 187
 188         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
 189                 | NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_IP_CSUM;
 190 }