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_reset_mac_header(skb);
  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 to any valid ethernet address. */
  87 static int br_set_mac_address(struct net_device *dev, void *p)
  88 {
  89         struct net_bridge *br = netdev_priv(dev);
  90         struct sockaddr *addr = p;
  91
  92         if (!is_valid_ether_addr(addr->sa_data))
  93                 return -EINVAL;
  94
  95         spin_lock_bh(&br->lock);
  96         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  97         br_stp_change_bridge_id(br, addr->sa_data);
  98         spin_unlock_bh(&br->lock);
  99
 100         return 0;
 101 }
 102
 103 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 104 {
 105         strcpy(info->driver, "bridge");
 106         strcpy(info->version, BR_VERSION);
 107         strcpy(info->fw_version, "N/A");
 108         strcpy(info->bus_info, "N/A");
 109 }
 110
 111 static int br_set_sg(struct net_device *dev, u32 data)
 112 {
 113         struct net_bridge *br = netdev_priv(dev);
 114
 115         if (data)
 116                 br->feature_mask |= NETIF_F_SG;
 117         else
 118                 br->feature_mask &= ~NETIF_F_SG;
 119
 120         br_features_recompute(br);
 121         return 0;
 122 }
 123
 124 static int br_set_tso(struct net_device *dev, u32 data)
 125 {
 126         struct net_bridge *br = netdev_priv(dev);
 127
 128         if (data)
 129                 br->feature_mask |= NETIF_F_TSO;
 130         else
 131                 br->feature_mask &= ~NETIF_F_TSO;
 132
 133         br_features_recompute(br);
 134         return 0;
 135 }
 136
 137 static int br_set_tx_csum(struct net_device *dev, u32 data)
 138 {
 139         struct net_bridge *br = netdev_priv(dev);
 140
 141         if (data)
 142                 br->feature_mask |= NETIF_F_NO_CSUM;
 143         else
 144                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 145
 146         br_features_recompute(br);
 147         return 0;
 148 }
 149
 150 static struct ethtool_ops br_ethtool_ops = {
 151         .get_drvinfo = br_getinfo,
 152         .get_link = ethtool_op_get_link,
 153         .get_sg = ethtool_op_get_sg,
 154         .set_sg = br_set_sg,
 155         .get_tx_csum = ethtool_op_get_tx_csum,
 156         .set_tx_csum = br_set_tx_csum,
 157         .get_tso = ethtool_op_get_tso,
 158         .set_tso = br_set_tso,
 159 };
 160
 161 void br_dev_setup(struct net_device *dev)
 162 {
 163         memset(dev->dev_addr, 0, ETH_ALEN);
 164
 165         ether_setup(dev);
 166
 167         dev->do_ioctl = br_dev_ioctl;
 168         dev->get_stats = br_dev_get_stats;
 169         dev->hard_start_xmit = br_dev_xmit;
 170         dev->open = br_dev_open;
 171         dev->set_multicast_list = br_dev_set_multicast_list;
 172         dev->change_mtu = br_change_mtu;
 173         dev->destructor = free_netdev;
 174         SET_MODULE_OWNER(dev);
 175         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 176         dev->stop = br_dev_stop;
 177         dev->tx_queue_len = 0;
 178         dev->set_mac_address = br_set_mac_address;
 179         dev->priv_flags = IFF_EBRIDGE;
 180
 181         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 182                         NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_GSO_ROBUST;
 183 }