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         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 NETDEV_TX_OK;
  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         struct net_bridge *br = netdev_priv(dev);
  72         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
  73                 return -EINVAL;
  74
  75         dev->mtu = new_mtu;
  76
  77 #ifdef CONFIG_BRIDGE_NETFILTER
  78         /* remember the MTU in the rtable for PMTU */
  79         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
  80 #endif
  81
  82         return 0;
  83 }
  84
  85 /* Allow setting mac address to any valid ethernet address. */
  86 static int br_set_mac_address(struct net_device *dev, void *p)
  87 {
  88         struct net_bridge *br = netdev_priv(dev);
  89         struct sockaddr *addr = p;
  90
  91         if (!is_valid_ether_addr(addr->sa_data))
  92                 return -EINVAL;
  93
  94         spin_lock_bh(&br->lock);
  95         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  96         br_stp_change_bridge_id(br, addr->sa_data);
  97         br->flags |= BR_SET_MAC_ADDR;
  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 const struct ethtool_ops br_ethtool_ops = {
 151         .get_drvinfo    = br_getinfo,
 152         .get_link       = ethtool_op_get_link,
 153         .get_tx_csum    = ethtool_op_get_tx_csum,
 154         .set_tx_csum    = br_set_tx_csum,
 155         .get_sg         = ethtool_op_get_sg,
 156         .set_sg         = br_set_sg,
 157         .get_tso        = ethtool_op_get_tso,
 158         .set_tso        = br_set_tso,
 159         .get_ufo        = ethtool_op_get_ufo,
 160         .get_flags      = ethtool_op_get_flags,
 161 };
 162
 163 static const struct net_device_ops br_netdev_ops = {
 164         .ndo_open                = br_dev_open,
 165         .ndo_stop                = br_dev_stop,
 166         .ndo_start_xmit          = br_dev_xmit,
 167         .ndo_set_mac_address     = br_set_mac_address,
 168         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 169         .ndo_change_mtu          = br_change_mtu,
 170         .ndo_do_ioctl            = br_dev_ioctl,
 171 };
 172
 173 void br_dev_setup(struct net_device *dev)
 174 {
 175         random_ether_addr(dev->dev_addr);
 176         ether_setup(dev);
 177
 178         dev->netdev_ops = &br_netdev_ops;
 179         dev->destructor = free_netdev;
 180         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 181         dev->tx_queue_len = 0;
 182         dev->priv_flags = IFF_EBRIDGE;
 183
 184         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 185                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 186                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 187 }