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 /* net device transmit always called with no BH (preempt_disabled) */
  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         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         return 0;
  51 }
  52
  53 static int br_dev_open(struct net_device *dev)
  54 {
  55         struct net_bridge *br = netdev_priv(dev);
  56
  57         br_features_recompute(br);
  58         netif_start_queue(dev);
  59         br_stp_enable_bridge(br);
  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(netdev_priv(dev));
  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(netdev_priv(dev)))
  80                 return -EINVAL;
  81
  82         dev->mtu = new_mtu;
  83         return 0;
  84 }
  85
  86 /* Allow setting mac address of pseudo-bridge to be same as
  87  * any of the bound interfaces
  88  */
  89 static int br_set_mac_address(struct net_device *dev, void *p)
  90 {
  91         struct net_bridge *br = netdev_priv(dev);
  92         struct sockaddr *addr = p;
  93         struct net_bridge_port *port;
  94         int err = -EADDRNOTAVAIL;
  95
  96         spin_lock_bh(&br->lock);
  97         list_for_each_entry(port, &br->port_list, list) {
  98                 if (!compare_ether_addr(port->dev->dev_addr, addr->sa_data)) {
  99                         br_stp_change_bridge_id(br, addr->sa_data);
 100                         err = 0;
 101                         break;
 102                 }
 103         }
 104         spin_unlock_bh(&br->lock);
 105
 106         return err;
 107 }
 108
 109 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 110 {
 111         strcpy(info->driver, "bridge");
 112         strcpy(info->version, BR_VERSION);
 113         strcpy(info->fw_version, "N/A");
 114         strcpy(info->bus_info, "N/A");
 115 }
 116
 117 static int br_set_sg(struct net_device *dev, u32 data)
 118 {
 119         struct net_bridge *br = netdev_priv(dev);
 120
 121         if (data)
 122                 br->feature_mask |= NETIF_F_SG;
 123         else
 124                 br->feature_mask &= ~NETIF_F_SG;
 125
 126         br_features_recompute(br);
 127         return 0;
 128 }
 129
 130 static int br_set_tso(struct net_device *dev, u32 data)
 131 {
 132         struct net_bridge *br = netdev_priv(dev);
 133
 134         if (data)
 135                 br->feature_mask |= NETIF_F_TSO;
 136         else
 137                 br->feature_mask &= ~NETIF_F_TSO;
 138
 139         br_features_recompute(br);
 140         return 0;
 141 }
 142
 143 static int br_set_tx_csum(struct net_device *dev, u32 data)
 144 {
 145         struct net_bridge *br = netdev_priv(dev);
 146
 147         if (data)
 148                 br->feature_mask |= NETIF_F_NO_CSUM;
 149         else
 150                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 151
 152         br_features_recompute(br);
 153         return 0;
 154 }
 155
 156 static struct ethtool_ops br_ethtool_ops = {
 157         .get_drvinfo = br_getinfo,
 158         .get_link = ethtool_op_get_link,
 159         .get_sg = ethtool_op_get_sg,
 160         .set_sg = br_set_sg,
 161         .get_tx_csum = ethtool_op_get_tx_csum,
 162         .set_tx_csum = br_set_tx_csum,
 163         .get_tso = ethtool_op_get_tso,
 164         .set_tso = br_set_tso,
 165 };
 166
 167 void br_dev_setup(struct net_device *dev)
 168 {
 169         memset(dev->dev_addr, 0, ETH_ALEN);
 170
 171         ether_setup(dev);
 172
 173         dev->do_ioctl = br_dev_ioctl;
 174         dev->get_stats = br_dev_get_stats;
 175         dev->hard_start_xmit = br_dev_xmit;
 176         dev->open = br_dev_open;
 177         dev->set_multicast_list = br_dev_set_multicast_list;
 178         dev->change_mtu = br_change_mtu;
 179         dev->destructor = free_netdev;
 180         SET_MODULE_OWNER(dev);
 181         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 182         dev->stop = br_dev_stop;
 183         dev->tx_queue_len = 0;
 184         dev->set_mac_address = br_set_mac_address;
 185         dev->priv_flags = IFF_EBRIDGE;
 186
 187         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 188                         NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_GSO_ROBUST;
 189 }