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 netdev_tx_t 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         BR_INPUT_SKB_CB(skb)->brdev = dev;
  30
  31         dev->stats.tx_packets++;
  32         dev->stats.tx_bytes += skb->len;
  33
  34         skb_reset_mac_header(skb);
  35         skb_pull(skb, ETH_HLEN);
  36
  37         if (dest[0] & 1)
  38                 br_flood_deliver(br, skb);
  39         else if ((dst = __br_fdb_get(br, dest)) != NULL)
  40                 br_deliver(dst->dst, skb);
  41         else
  42                 br_flood_deliver(br, skb);
  43
  44         return NETDEV_TX_OK;
  45 }
  46
  47 static int br_dev_open(struct net_device *dev)
  48 {
  49         struct net_bridge *br = netdev_priv(dev);
  50
  51         br_features_recompute(br);
  52         netif_start_queue(dev);
  53         br_stp_enable_bridge(br);
  54
  55         return 0;
  56 }
  57
  58 static void br_dev_set_multicast_list(struct net_device *dev)
  59 {
  60 }
  61
  62 static int br_dev_stop(struct net_device *dev)
  63 {
  64         br_stp_disable_bridge(netdev_priv(dev));
  65
  66         netif_stop_queue(dev);
  67
  68         return 0;
  69 }
  70
  71 static int br_change_mtu(struct net_device *dev, int new_mtu)
  72 {
  73         struct net_bridge *br = netdev_priv(dev);
  74         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
  75                 return -EINVAL;
  76
  77         dev->mtu = new_mtu;
  78
  79 #ifdef CONFIG_BRIDGE_NETFILTER
  80         /* remember the MTU in the rtable for PMTU */
  81         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
  82 #endif
  83
  84         return 0;
  85 }
  86
  87 /* Allow setting mac address to any valid ethernet address. */
  88 static int br_set_mac_address(struct net_device *dev, void *p)
  89 {
  90         struct net_bridge *br = netdev_priv(dev);
  91         struct sockaddr *addr = p;
  92
  93         if (!is_valid_ether_addr(addr->sa_data))
  94                 return -EINVAL;
  95
  96         spin_lock_bh(&br->lock);
  97         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  98         br_stp_change_bridge_id(br, addr->sa_data);
  99         br->flags |= BR_SET_MAC_ADDR;
 100         spin_unlock_bh(&br->lock);
 101
 102         return 0;
 103 }
 104
 105 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 106 {
 107         strcpy(info->driver, "bridge");
 108         strcpy(info->version, BR_VERSION);
 109         strcpy(info->fw_version, "N/A");
 110         strcpy(info->bus_info, "N/A");
 111 }
 112
 113 static int br_set_sg(struct net_device *dev, u32 data)
 114 {
 115         struct net_bridge *br = netdev_priv(dev);
 116
 117         if (data)
 118                 br->feature_mask |= NETIF_F_SG;
 119         else
 120                 br->feature_mask &= ~NETIF_F_SG;
 121
 122         br_features_recompute(br);
 123         return 0;
 124 }
 125
 126 static int br_set_tso(struct net_device *dev, u32 data)
 127 {
 128         struct net_bridge *br = netdev_priv(dev);
 129
 130         if (data)
 131                 br->feature_mask |= NETIF_F_TSO;
 132         else
 133                 br->feature_mask &= ~NETIF_F_TSO;
 134
 135         br_features_recompute(br);
 136         return 0;
 137 }
 138
 139 static int br_set_tx_csum(struct net_device *dev, u32 data)
 140 {
 141         struct net_bridge *br = netdev_priv(dev);
 142
 143         if (data)
 144                 br->feature_mask |= NETIF_F_NO_CSUM;
 145         else
 146                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 147
 148         br_features_recompute(br);
 149         return 0;
 150 }
 151
 152 static const struct ethtool_ops br_ethtool_ops = {
 153         .get_drvinfo    = br_getinfo,
 154         .get_link       = ethtool_op_get_link,
 155         .get_tx_csum    = ethtool_op_get_tx_csum,
 156         .set_tx_csum    = br_set_tx_csum,
 157         .get_sg         = ethtool_op_get_sg,
 158         .set_sg         = br_set_sg,
 159         .get_tso        = ethtool_op_get_tso,
 160         .set_tso        = br_set_tso,
 161         .get_ufo        = ethtool_op_get_ufo,
 162         .set_ufo        = ethtool_op_set_ufo,
 163         .get_flags      = ethtool_op_get_flags,
 164 };
 165
 166 static const struct net_device_ops br_netdev_ops = {
 167         .ndo_open                = br_dev_open,
 168         .ndo_stop                = br_dev_stop,
 169         .ndo_start_xmit          = br_dev_xmit,
 170         .ndo_set_mac_address     = br_set_mac_address,
 171         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 172         .ndo_change_mtu          = br_change_mtu,
 173         .ndo_do_ioctl            = br_dev_ioctl,
 174 };
 175
 176 void br_dev_setup(struct net_device *dev)
 177 {
 178         random_ether_addr(dev->dev_addr);
 179         ether_setup(dev);
 180
 181         dev->netdev_ops = &br_netdev_ops;
 182         dev->destructor = free_netdev;
 183         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 184         dev->tx_queue_len = 0;
 185         dev->priv_flags = IFF_EBRIDGE;
 186
 187         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 188                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 189                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 190 }