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  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/ethtool.h>
  18
  19 #include <asm/uaccess.h>
  20 #include "br_private.h"
  21
  22 /* net device transmit always called with no BH (preempt_disabled) */
  23 int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
  24 {
  25         struct net_bridge *br = netdev_priv(dev);
  26         const unsigned char *dest = skb->data;
  27         struct net_bridge_fdb_entry *dst;
  28
  29         dev->stats.tx_packets++;
  30         dev->stats.tx_bytes += skb->len;
  31
  32         skb_reset_mac_header(skb);
  33         skb_pull(skb, ETH_HLEN);
  34
  35         if (dest[0] & 1)
  36                 br_flood_deliver(br, skb);
  37         else if ((dst = __br_fdb_get(br, dest)) != NULL)
  38                 br_deliver(dst->dst, skb);
  39         else
  40                 br_flood_deliver(br, skb);
  41
  42         return 0;
  43 }
  44
  45 static int br_dev_open(struct net_device *dev)
  46 {
  47         struct net_bridge *br = netdev_priv(dev);
  48
  49         br_features_recompute(br);
  50         netif_start_queue(dev);
  51         br_stp_enable_bridge(br);
  52
  53         return 0;
  54 }
  55
  56 static void br_dev_set_multicast_list(struct net_device *dev)
  57 {
  58 }
  59
  60 static int br_dev_stop(struct net_device *dev)
  61 {
  62         br_stp_disable_bridge(netdev_priv(dev));
  63
  64         netif_stop_queue(dev);
  65
  66         return 0;
  67 }
  68
  69 static int br_change_mtu(struct net_device *dev, int new_mtu)
  70 {
  71         if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
  72                 return -EINVAL;
  73
  74         dev->mtu = new_mtu;
  75         return 0;
  76 }
  77
  78 /* Allow setting mac address to any valid ethernet address. */
  79 static int br_set_mac_address(struct net_device *dev, void *p)
  80 {
  81         struct net_bridge *br = netdev_priv(dev);
  82         struct sockaddr *addr = p;
  83
  84         if (!is_valid_ether_addr(addr->sa_data))
  85                 return -EINVAL;
  86
  87         spin_lock_bh(&br->lock);
  88         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  89         br_stp_change_bridge_id(br, addr->sa_data);
  90         spin_unlock_bh(&br->lock);
  91
  92         return 0;
  93 }
  94
  95 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
  96 {
  97         strcpy(info->driver, "bridge");
  98         strcpy(info->version, BR_VERSION);
  99         strcpy(info->fw_version, "N/A");
 100         strcpy(info->bus_info, "N/A");
 101 }
 102
 103 static int br_set_sg(struct net_device *dev, u32 data)
 104 {
 105         struct net_bridge *br = netdev_priv(dev);
 106
 107         if (data)
 108                 br->feature_mask |= NETIF_F_SG;
 109         else
 110                 br->feature_mask &= ~NETIF_F_SG;
 111
 112         br_features_recompute(br);
 113         return 0;
 114 }
 115
 116 static int br_set_tso(struct net_device *dev, u32 data)
 117 {
 118         struct net_bridge *br = netdev_priv(dev);
 119
 120         if (data)
 121                 br->feature_mask |= NETIF_F_TSO;
 122         else
 123                 br->feature_mask &= ~NETIF_F_TSO;
 124
 125         br_features_recompute(br);
 126         return 0;
 127 }
 128
 129 static int br_set_tx_csum(struct net_device *dev, u32 data)
 130 {
 131         struct net_bridge *br = netdev_priv(dev);
 132
 133         if (data)
 134                 br->feature_mask |= NETIF_F_NO_CSUM;
 135         else
 136                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 137
 138         br_features_recompute(br);
 139         return 0;
 140 }
 141
 142 static struct ethtool_ops br_ethtool_ops = {
 143         .get_drvinfo = br_getinfo,
 144         .get_link = ethtool_op_get_link,
 145         .set_sg = br_set_sg,
 146         .set_tx_csum = br_set_tx_csum,
 147         .set_tso = br_set_tso,
 148 };
 149
 150 void br_dev_setup(struct net_device *dev)
 151 {
 152         random_ether_addr(dev->dev_addr);
 153         ether_setup(dev);
 154
 155         dev->do_ioctl = br_dev_ioctl;
 156         dev->hard_start_xmit = br_dev_xmit;
 157         dev->open = br_dev_open;
 158         dev->set_multicast_list = br_dev_set_multicast_list;
 159         dev->change_mtu = br_change_mtu;
 160         dev->destructor = free_netdev;
 161         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 162         dev->stop = br_dev_stop;
 163         dev->tx_queue_len = 0;
 164         dev->set_mac_address = br_set_mac_address;
 165         dev->priv_flags = IFF_EBRIDGE;
 166
 167         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 168                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX;
 169 }