Pileus Git - ~andy/linux/blob - 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         br_multicast_open(br);
  55
  56         return 0;
  57 }
  58
  59 static void br_dev_set_multicast_list(struct net_device *dev)
  60 {
  61 }
  62
  63 static int br_dev_stop(struct net_device *dev)
  64 {
  65         struct net_bridge *br = netdev_priv(dev);
  66
  67         br_stp_disable_bridge(br);
  68         br_multicast_stop(br);
  69
  70         netif_stop_queue(dev);
  71
  72         return 0;
  73 }
  74
  75 static int br_change_mtu(struct net_device *dev, int new_mtu)
  76 {
  77         struct net_bridge *br = netdev_priv(dev);
  78         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
  79                 return -EINVAL;
  80
  81         dev->mtu = new_mtu;
  82
  83 #ifdef CONFIG_BRIDGE_NETFILTER
  84         /* remember the MTU in the rtable for PMTU */
  85         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
  86 #endif
  87
  88         return 0;
  89 }
  90
  91 /* Allow setting mac address to any valid ethernet address. */
  92 static int br_set_mac_address(struct net_device *dev, void *p)
  93 {
  94         struct net_bridge *br = netdev_priv(dev);
  95         struct sockaddr *addr = p;
  96
  97         if (!is_valid_ether_addr(addr->sa_data))
  98                 return -EINVAL;
  99
 100         spin_lock_bh(&br->lock);
 101         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 102         br_stp_change_bridge_id(br, addr->sa_data);
 103         br->flags |= BR_SET_MAC_ADDR;
 104         spin_unlock_bh(&br->lock);
 105
 106         return 0;
 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 const struct ethtool_ops br_ethtool_ops = {
 157         .get_drvinfo    = br_getinfo,
 158         .get_link       = ethtool_op_get_link,
 159         .get_tx_csum    = ethtool_op_get_tx_csum,
 160         .set_tx_csum    = br_set_tx_csum,
 161         .get_sg         = ethtool_op_get_sg,
 162         .set_sg         = br_set_sg,
 163         .get_tso        = ethtool_op_get_tso,
 164         .set_tso        = br_set_tso,
 165         .get_ufo        = ethtool_op_get_ufo,
 166         .set_ufo        = ethtool_op_set_ufo,
 167         .get_flags      = ethtool_op_get_flags,
 168 };
 169
 170 static const struct net_device_ops br_netdev_ops = {
 171         .ndo_open                = br_dev_open,
 172         .ndo_stop                = br_dev_stop,
 173         .ndo_start_xmit          = br_dev_xmit,
 174         .ndo_set_mac_address     = br_set_mac_address,
 175         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 176         .ndo_change_mtu          = br_change_mtu,
 177         .ndo_do_ioctl            = br_dev_ioctl,
 178 };
 179
 180 void br_dev_setup(struct net_device *dev)
 181 {
 182         random_ether_addr(dev->dev_addr);
 183         ether_setup(dev);
 184
 185         dev->netdev_ops = &br_netdev_ops;
 186         dev->destructor = free_netdev;
 187         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 188         dev->tx_queue_len = 0;
 189         dev->priv_flags = IFF_EBRIDGE;
 190
 191         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 192                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 193                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 194 }