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         struct net_bridge_mdb_entry *mdst;
  29
  30         BR_INPUT_SKB_CB(skb)->brdev = dev;
  31
  32         dev->stats.tx_packets++;
  33         dev->stats.tx_bytes += skb->len;
  34
  35         skb_reset_mac_header(skb);
  36         skb_pull(skb, ETH_HLEN);
  37
  38         if (dest[0] & 1) {
  39                 if (br_multicast_rcv(br, NULL, skb))
  40                         goto out;
  41
  42                 mdst = br_mdb_get(br, skb);
  43                 if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
  44                         br_multicast_deliver(mdst, skb);
  45                 else
  46                         br_flood_deliver(br, skb);
  47         } else if ((dst = __br_fdb_get(br, dest)) != NULL)
  48                 br_deliver(dst->dst, skb);
  49         else
  50                 br_flood_deliver(br, skb);
  51
  52 out:
  53         return NETDEV_TX_OK;
  54 }
  55
  56 static int br_dev_open(struct net_device *dev)
  57 {
  58         struct net_bridge *br = netdev_priv(dev);
  59
  60         br_features_recompute(br);
  61         netif_start_queue(dev);
  62         br_stp_enable_bridge(br);
  63         br_multicast_open(br);
  64
  65         return 0;
  66 }
  67
  68 static void br_dev_set_multicast_list(struct net_device *dev)
  69 {
  70 }
  71
  72 static int br_dev_stop(struct net_device *dev)
  73 {
  74         struct net_bridge *br = netdev_priv(dev);
  75
  76         br_stp_disable_bridge(br);
  77         br_multicast_stop(br);
  78
  79         netif_stop_queue(dev);
  80
  81         return 0;
  82 }
  83
  84 static int br_change_mtu(struct net_device *dev, int new_mtu)
  85 {
  86         struct net_bridge *br = netdev_priv(dev);
  87         if (new_mtu < 68 || new_mtu > br_min_mtu(br))
  88                 return -EINVAL;
  89
  90         dev->mtu = new_mtu;
  91
  92 #ifdef CONFIG_BRIDGE_NETFILTER
  93         /* remember the MTU in the rtable for PMTU */
  94         br->fake_rtable.u.dst.metrics[RTAX_MTU - 1] = new_mtu;
  95 #endif
  96
  97         return 0;
  98 }
  99
 100 /* Allow setting mac address to any valid ethernet address. */
 101 static int br_set_mac_address(struct net_device *dev, void *p)
 102 {
 103         struct net_bridge *br = netdev_priv(dev);
 104         struct sockaddr *addr = p;
 105
 106         if (!is_valid_ether_addr(addr->sa_data))
 107                 return -EINVAL;
 108
 109         spin_lock_bh(&br->lock);
 110         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 111         br_stp_change_bridge_id(br, addr->sa_data);
 112         br->flags |= BR_SET_MAC_ADDR;
 113         spin_unlock_bh(&br->lock);
 114
 115         return 0;
 116 }
 117
 118 static void br_getinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 119 {
 120         strcpy(info->driver, "bridge");
 121         strcpy(info->version, BR_VERSION);
 122         strcpy(info->fw_version, "N/A");
 123         strcpy(info->bus_info, "N/A");
 124 }
 125
 126 static int br_set_sg(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_SG;
 132         else
 133                 br->feature_mask &= ~NETIF_F_SG;
 134
 135         br_features_recompute(br);
 136         return 0;
 137 }
 138
 139 static int br_set_tso(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_TSO;
 145         else
 146                 br->feature_mask &= ~NETIF_F_TSO;
 147
 148         br_features_recompute(br);
 149         return 0;
 150 }
 151
 152 static int br_set_tx_csum(struct net_device *dev, u32 data)
 153 {
 154         struct net_bridge *br = netdev_priv(dev);
 155
 156         if (data)
 157                 br->feature_mask |= NETIF_F_NO_CSUM;
 158         else
 159                 br->feature_mask &= ~NETIF_F_ALL_CSUM;
 160
 161         br_features_recompute(br);
 162         return 0;
 163 }
 164
 165 static const struct ethtool_ops br_ethtool_ops = {
 166         .get_drvinfo    = br_getinfo,
 167         .get_link       = ethtool_op_get_link,
 168         .get_tx_csum    = ethtool_op_get_tx_csum,
 169         .set_tx_csum    = br_set_tx_csum,
 170         .get_sg         = ethtool_op_get_sg,
 171         .set_sg         = br_set_sg,
 172         .get_tso        = ethtool_op_get_tso,
 173         .set_tso        = br_set_tso,
 174         .get_ufo        = ethtool_op_get_ufo,
 175         .set_ufo        = ethtool_op_set_ufo,
 176         .get_flags      = ethtool_op_get_flags,
 177 };
 178
 179 static const struct net_device_ops br_netdev_ops = {
 180         .ndo_open                = br_dev_open,
 181         .ndo_stop                = br_dev_stop,
 182         .ndo_start_xmit          = br_dev_xmit,
 183         .ndo_set_mac_address     = br_set_mac_address,
 184         .ndo_set_multicast_list  = br_dev_set_multicast_list,
 185         .ndo_change_mtu          = br_change_mtu,
 186         .ndo_do_ioctl            = br_dev_ioctl,
 187 };
 188
 189 void br_dev_setup(struct net_device *dev)
 190 {
 191         random_ether_addr(dev->dev_addr);
 192         ether_setup(dev);
 193
 194         dev->netdev_ops = &br_netdev_ops;
 195         dev->destructor = free_netdev;
 196         SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
 197         dev->tx_queue_len = 0;
 198         dev->priv_flags = IFF_EBRIDGE;
 199
 200         dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 201                         NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_LLTX |
 202                         NETIF_F_NETNS_LOCAL | NETIF_F_GSO;
 203 }